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Objective To ensure the compatibility and consistency of functionality, requirements, and interfaces within FAO (fully automatic operation) system, it is necessary to design tasks for each key stage based on the characteristics of FAO system and to outline the key points of integrated technology management for the critical stages. Method Starting from the core specialized systems involved in FAO system integration, the key points for the integrated technology management at each stage are sorted out in detail based on the management work of each core specialized system, including functionality design, interface consistency, technical coordination, and interface coordination in above-mentioned FAO system management critical stages. Taking FAO system network structure design and interlocking technology solutions as example, the specialized design management phase is explained with emphasis. Result & Conclusion During the bidding support phase, it is crucial to focus on the interlocking function, system performance, redundancy, and safety requirements of the core specialized systems, clarifying functional requirements, interface requirements, interface supply requirements, and interface party responsibilities related to FAO. In the functional design phase, structural design is used to redefine the scenario files, extracting the functionalities needed by each core specialized system and integrating these functions into a detailed design for each above system. During the requirement management phase, a closed-loop management approach is adopted for FAO scenario files from system integration perspective, ensuring that all requirements are decomposed into the core specialized systems, and effectively implemented. In the specialized design management phase, key new technology solutions, such as interlocking technology, data implementation, network structure design, wake-up and sleep, and remote control, need to be studied in detail. During the interface management phase, the interfaces between multiple specialized systems from the system integration perspective should be managed.

[Objective] Energy transition is a key path to achieving China’s carbon peaking and carbon neutrality goals, and exploring the impact of energy transition on the urban-rural income gaps can provide a scientific basis for realizing equity in the transition. [Methods] Based on the panel data of 108 cities at the prefecture level and above in the Yangtze River Economic Belt from 2010 to 2020, this study employed spatial analysis and fixed-effects model to analyze the characteristics of the temporal and spatial change of energy transition and urban-rural income gaps, and to reveal the correlation between the two and their regional heterogeneity of this relationship. [Results] (1) The performance level of energy transition of cities in the Yangtze River Economic Belt shows an overall upward trend, and the energy transition index values of provincial capital cities has remained at a high level for a long time. At the same time, urban-rural income gaps have been narrowing year by year, showing a pattern of high in the west and low in the east. (2) The relationship between energy transition and urban-rural income gaps in cities in the Yangtze River Economic Belt was U-shaped. With the improvement of the performance level of energy transition, urban-rural income gaps showed the characteristic of decreasing and then increasing. (3) There was a significant difference in the relationship between energy transition and urban-rural income gaps in cities in the upper, middle, and lower reaches of the Yangtze River, with the upstream showing an inverted U-shaped relationship and the middle reaches showing a U-shaped relationship, and the downstream showing no significant correlation. This suggests that the energy transition paths of cities in the upstream region were gradually moving towards a fair direction, while the opposite was true in the midstream region, and that urban and rural residents in the downstream region were less sensitive to the socioeconomic effects caused by energy transition. [Conclusion] Therefore, diversified energy transition policies should be formulated in accordance with the actual development of the upstream, midstream and downstream, so as to effectively prevent the negative impacts of the transition and actively promote the just energy transition and the balanced development of urban and rural regions.

Objective In order to solve the lag problem of current passive detection methods in detecting the obstacles in the area directly related to train running (hereinafter referred to as train running area or TRA), reserve more reaction time for train braking, reduce the incidence of train accidents, and mitigate the consequence of the train accidents, it is necessary to study the onboard active TRA obstacle detection technology. Method Through uniting the combination of multiple sensors and detection sub-tasks with the train signal system units, an active onboard detection system is proposed to actively detect whether there are obstacles intruding in the TRA boundary. Through testing the above system in the straight TRA with different obstacles, the effective identification distances of the obstacles are obtained. Result & Conclusion The above system can provide the train with autonomous perception ability, timely sending alarm messages or starting train braking when obstacles intruding in the boundary appear in the front TRA.

It is of great significance to accurately identify the rockburst hazard areas and give the hazard level and its evolution law for rockburst prevention and control. In this study, the method combining deformation localization with multivariate geophysical indicators spatial scanning is used to explore the precursor characteristics of microseismic in the area of high-energy microseismic events and track the dynamic evolution process of rockburst hazard areas. Based on the principle of deformation localization, the gradient significance indicator is used to identify the deformation localization areas and delineate the hazard area. The sliding window scanning method is used to study the spatial distribution characteristics of physical indicators such as b value, A(b) value and S value in the deformation localization areas. The b value, A(b) value, S value, ∆F and A(t) value corresponding to the high-energy microseismic events identified by the gradient significance index during excavation are used as the threshold values for classifying the rockbrust hazard level during the mining operation. The Bayesian network method is used to analyze the effectiveness of each physical indicator in predicting the hazard areas, and a comprehensive predicting hazard areas model is constructed to calculate the weight of physical indicators and obtain the comprehensive predicting indicators. The 513 working face is analyzed as an example. The results show that the geophysical indicators can identify the microseismic gathering signal and assess the hazard areas. Three microseismic events gathering areas are determined according to the measured data of 513 working face. The spatial scanning results of physical indicators and the gathering areas of microseismic data have the synchronization characteristics. When some high-energy microseismic events occur, the physical indicator value of the area is higher than the rockburst hazard threshold, and the hazard areas identified by the physical indicator spatial scanning is basically consistent with the gathering areas of microseismic data. The integrated prediction model is used to predict the hazard area during the mining period of the working face. The results show that the rockburst hazard events mostly occur in the strong high hazard areas predicted by the integrated prediction indicator. With the superposition of microseismic data during the mining period, the high rockburst hazard areas is further concentrated, and the overlap degree with the high hazard event location is higher. The prediction efficiency of the integrated prediction indicator is generally higher than that of single physical indicator, which significantly enhances the ability to accurately predict the rockburst hazard areas.

Stable operation of wastewater plants under overload has been a hot spot of concern for researchers，and efficient nitrogen and phosphorus removal is a difficult point in the process of stable operation. A wastewater treatment plant in Zhengzhou uses a pre-anoxic modified A2/O process，treating 1.2-1.8 times the design value，with influent BOD5/COD，BOD5/TN and BOD5/TP ranges of 0.19-0.88，1.38-7.21 and 13.12-89.17 respectively，and uses multi-point distribution of influent，increased internal reflux ratio，precise aeration and other operation methods. The variation of nitrogen and phosphorus in the whole wastewater process was analyzed. The results showed that the removal rates of COD，TN and TP reached 90.4%，83% and 98.55%，which were better than the Class Ⅰ A discharge standard of the Pollutant Discharge Standard for Urban Wastewater Treatment Plants（GB 18918—2002）， when the influent water was evenly distributed in the pre-anoxic，anaerobic and anoxic sections，the internal return ratio was 400% and the DO concentration in the aerobic tank was below 0.5 mg/L.Some indicators reached Surface Water Quality Standard（GB 3838—2002） Class Ⅲ standard.

This is an article in the field of mineral processing engineering. Barium slag is toxic solid waste, and a large amount of barium slag is piled up to seriously harm the environment and cause huge waste of national land resources. Acid-dissolving barium in acid leaching barium residue is one of the best ways to dispose of barium residue and recover barium. The paper adopts the flotation process to recover the barium sulfate in the acid leaching tailings of the enriched barium slag, in order to realize the comprehensive recovery of barium resources in the barium slag. The experimental research of the flotation recovery of barium residue acid leaching residue shows that. Under the condition that the amount of sodium carbonate is 2000 g/t, the amount of sodium silicate is 500 g/t and the amount of sodium oleate is 3000 g/t, through the flotation closed-circuit process of one roughing, four beneficiation, and two sweeping. Obtained the flotation index of 85.38% barite concentrate grade and 69.35% recovery rate. Concentrate products meet the barite standards used in the industrial production of barium carbonate.

On October 6, 2021, a high-position landslide disaster occurred in Yanwo Village，Rongshan Town, Lizhou District, Guangyuan City,Sichuan Province, around 13: 00. The landslide resulted in the destruction of 4 houses, 3 power lines, the burial of a 170-meter-long rural road, and the blockage of a 350-meter-long river channel. By utilizing a variety of remote sensing information sources, including multi-period satellite data before and after landslide, high-precision UAV aerial images, and airborne LiDAR data, the characteristics of high landslide and its sliding mode are studied by using a four-dimensional analysis approach combining three-dimensional space with time. Starting from the development background of high landslide, the deformation and failure characteristics and sliding mode of high landslide are summarized by analyzing the deformation characteristics before sliding and the dynamic procession of the high landslide. Based on the deduced landslide progression and the stability evaluation of the residual landslide at the rear, three sliding modes for future high-position landslide events are predicted and analyzed: Firstly, the back edge of landslide continues to be disjointed and move, causing a direct shear failure of the front part of the landslide by squeezing. Secondly, the trailing edge of the landslide continues to be disjointed and move, resulting in the sliding landslide occurs along the existing landslide channel. Thirdly, the initiation of the front part of the landslide trigger a tractional landslide in the middle and rear parts of the landslide. High-position landslides are common in the southwest mountainous areas, and during early geological hazard investigations, they should be effectively identified, and disaster prevention and mitigation measures should be strengthened.

ObjectiveThis paper aims to study the coupling response law of an electromagnetic pulse acting on a pyramid horn antenna under the condition of the random distribution of incident parameters. Methods First, a statistical analysis model of the electromagnetic pulse response of the horn antenna is established on the basis of a computer simulation technology (CST) and Matlab co-simulation. A simulation model of the antenna electromagnetic impulse response is then established by CST, and the rationality of the model is verified by the voltage standing wave ratio (VSWR) and gain curve. The impedance characteristics of the radio frequency port of the communication system under different states such as transmitting and receiving are considered. The coupling response indexes of antenna ports such as open circuit voltage (OCV), short circuit current (SCC) and load current are obtained under high-altitude electromagnetic pulse (HEMP) irradiation with a peak field strength of 50 kV/m. Finally, the azimuth, elevation and polarization angles are set in the spherical coordinate system to obey the uniform distribution, and Matlab is used to fit the main signal indicators such as the peak value and waveform energy of the antenna load response waveform. ResultsThe results show that the probability distribution of the main signal indicators is mostly convex. Taking the waveform peak value as an example, there is a 90% probability that the peak value of the response waveform is less than 0.13A, which is only 16.2% of the maximum peak value of 0.8A; that is, except in the specific electromagnetic pulse incident range, the signal indicators of the pyramid horn antenna response waveform are kept at a low level in most cases.ConclusionThe results of this study lay the foundation for the electromagnetic pulse vulnerability analysis of communication systems.

China and Gambia have a long history of diplomatic relations. The maritime fishery cooperation between China and Gambia is an overseas investment of resource guide, which is an industrial cooperation that develops and utilizes marine fishery resources in the exclusive economic zone of Gambia with official permission and promotes the interconnected development of relevant industries. Gambia is one of the important African countries along the Belt and Road Initiative, which is of great significance for China to expand its maritime development space and build a "blue partnership". The paper conducted a risk assessment of trans-oceanic fishery cooperation between China and Gambia, and analyzed the possible risk factors involved in the cooperation process. Combined with the fuzzy comprehensive evaluation method, built China and Gambia trans-oceanic fishery cooperation risk early warning model, to clarify the risk factors of primary and secondary relations. The results showed that the risk coefficient of trans-oceanic fishery cooperation between the two countries was above medium, and there was a great risk. The degree of impact of the risk factor, in descending order, was main risk factor, production risk factor, market risk factor, technology risk factor, policy risk factor. According to the results, the countermeasures and suggestions conducive to the orderly and healthy development of trans-oceanic fishery cooperation between the two countries were put forward to avoid the risks.

Objective To investigate the mechanism of hypoxia-induced free iron reduction in mouse pulmonary artery smooth muscle cells (PASMCs) and its role in the proliferation of PASMCs and pulmonary vascular remodeling. Methods ① Primary mouse PASMCs were cultured and divided into normoxic group(C), normoxic ferric ammonium citrate group (C+FAC), normoxic rapamycin group (C+R), hypoxic group (H), hypoxic ferric ammonium citrate group (H+FAC) and hypoxic rapamycin group (H+R). The C, C+FAC and C+R groups were incubated in normoxic (21% O2) enviroment for 48 h. The H, H+FAC and H+R groups were incubated in hypoxic (1% O2) environment for 48 h. The C+FAC and H+FAC groups were treated with ferrous ammonium citrate (FAC), and the C+R and H+R groups were treated with rapamycin (R). Cell proliferation was detected with CCK-8 assay and EdU proliferation assay. The content of intracellular free iron was measured by FerroOrange staining. The protein levels of iron regulatory proteins (IRPs), transferrin receptor (TFR), ferroportin (FPN) and ferritin heavy chain (FTH) were detected with Western blotting. ②Twenty-four C57/BL6N mice (male, 6 weeks old, weighting 18~22 g) were divided into normoxic group (C-4W), normoxic high-iron diet group (C+HID-4W), hypoxic group (H-4W) and hypoxic high-iron diet group (H+HID-4W) (n=6). The H-4W and H+HID-4W groups were placed in a low-pressure hypoxic environment at a simulated altitude of 5 000 m for 4 weeks. Right heart function, right ventricular systolic pressure, and pulmonary vascular remodeling in each group were observed and measured. Results Compared with C group, significantly enhanced proliferation (P < 0.01), reduced intracellular free iron content (P < 0.01), and up-regulated protein level of FTH were observed in the PASMCs of H group (P < 0.01). Compared with H group, the free iron content was obviously increased (P < 0.01) and cell proliferation was decreased in H+FAC group (P < 0.01). The H+R group had notably increased free iron content (P < 0.01), decreased cell proliferation (P < 0.05), and reduced protein level of FTH when compared with H group (P < 0.05). Compared with H-4W group, the mice in the H+HID-4W group showed significantly improved right heart function (P < 0.01), lower right ventricular systolic pressure (P < 0.05), reduced right heart hypertrophy (P < 0.01), and inhibited pulmonary artery thickening (P < 0.01). Conclusion Hypoxia mediates the reduction of free iron by inhibiting the ferritinophagy pathway, and thus promotes the proliferation of PASMCs and pulmonary artery remodeling.

Rock bolt support and borehole pressure relief change the medium properties of roadway surrounding rock, form the roadway gradient surrounding rock structure with three media and two planes, increase the absorption and attenuation ability of stress waves, and prevent the impact damage of roadway. In order to reveal the attenuation law of stress wave propagation in roadway gradient surrounding rock structure, the stress wave transmission model of gradient surrounding rock structure is established, and the mechanism of energy absorption and burst prevention of gradient surrounding rock structure is revealed from the aspect of wave field decomposition and energy distribution of elastic wave at the interface of different medium. The influence of the density of relief zone and the incident angle of stress wave on the energy coefficient is analyzed. It is found that the density of relief zone and the incident angle of gradient surrounding rock can significantly affect the energy coefficient of each refraction wave. Based on the numerical calculation of different gradient surrounding rock structure, the influence law of gradient surrounding rock structure on stress wave propagation attenuation is analyzed by integrating the amplitude attenuation factor, wave impedance matching factor, energy absorption ratio, and energy attenuation factor. The results show that as the width of the pressure relief zone of the gradient surrounding rock structure increases, the vibration frequency of the stress wave decreases, the amplitude attenuation factor increases, and the energy attenuation factor shows an upward trend, which improves the cushioning and seismic isolation performance of the gradient surrounding rock structure and enhances the burst prevention ability of roadway. When the width of the pressure relief zone is small, the complex superposition of stress waves in the gradient structure will be formed, which makes the amplitude of stress waves surge in the local region. Reasonable width of pressure relief zone can avoid the complex superposition of stress waves in the structure with three media and two planes. The row spacing between boreholes in the pressure relief zone decreases, the elastic modulus and density of the medium in the pressure relief zone of the gradient surrounding rock structure decrease, and the proportion of energy absorption increases, which improves the absorbing performance of the stress wave. The greater the wave impedance matching factor of the three zones in the gradient surrounding rock structure, the greater the energy attenuation factor, that is, the greater the difference in the medium properties of the three zones, the better the attenuation effect of the gradient surrounding rock structure on stress waves. The size and physical and mechanical properties of the pressure relief zone can be changed by adjusting the depth and row spacing of the pressure relief boreholes, which can effectively improve the wave absorption of the gradient surrounding rock structure, cushioning, and seismic isolation performance. Combining with engineering case analysis, it is proved that the surrounding rock with gradient structure can effectively absorb the stress wave energy generated by rock burst and avoid rock burst disasters.

In order to investigate the nonvolatile taste-active components in crayfish, free amino acids, nucleotides, organic acids, soluble sugars and alkaloids in cooked crayfish muscle were qualitatively and quantitatively analyzed by 1H nuclear magnetic resonance (1H NMR). Their taste activity values (TAVs) and equivalent umami concentration (EUC) were calculated to evaluate the key taste-active compounds and umami attributes, respectively. The results suggested that a total of 33 taste-active compounds were detected, among which arginine, histidine, glutamic acid, alanine, lysine, glycine, adenosine 5’-monophosphate (AMP), inosine 5’-mononucleotide (IMP), succinic acid and lactic acid were the key taste-active compounds with TAVs greater than 1.0, and they played an important role in the taste of crayfish. The EUC of crayfish was 9.1 g monosodium glutamate (MSG)/100 g, indicating very intense umami taste.

A large amount of barium slag accumulation will cause great harm to the environment. The use of hydrochloric acid leaching for barium residue can effectively recover the residual soluble barium salt in the barium residue and greatly reduce the harm of the barium residue to the environment. It is a better method to utilize the barium residue. Through experiment, this paper obtained the better barium slag hydrochloric acid leaching conditions, the barium slag grinding fineness is 0.074 mm accounted for 80%, hydrochloric acid concentration is 3 mol/L, leaching solid-liquid ratio is 1∶7, leaching time is 2 h, leaching temperature of 40 ℃, leaching mixing speed is 480 r/min, obtained the best barium ion leaching rate, barium ion leaching rate reached 38.88%. When only soluble barium salt is considered, the leaching rate of barium ion reaches 90.30%.

A green and efficient ultrasonic-assisted acidic natural deep eutectic solvents for the extraction of anthocyanins from Aronia Melanocarpa was developed. The extraction conditions were optimized by the artificial neural networks and genetic algorithms, and the stability and antioxidant activity of anthocyanins extracts were investigated. A series of acidic natural deep eutectic solvents were prepared using betaine and organic acids as hydrogen bond acceptor and hydrogen bond donor respectively. Their physical and chemical properties such as density, viscosity, pH value were measured. The structure and formation mechanism of natural deep eutectic solvents were studied by infrared spectroscopy. The optimal extraction conditions were optimized by artificial neural network combined with genetic algorithm. The photostability, thermal stability and antioxidant activity of anthocyanins extract were evaluated. The experimental results showed that the natural deep eutectic solvents formed by the hydrogen bond interaction between betaine and lactic acid had the characteristics of density as low as 1.19, viscosity as low as 24.75 mPa·s and pH as 2.89. The optimal extraction conditions were as follows: betaine and lactic acid were used to prepare natural deep eutectic solvents, molar ratio was 1:3, water content was 32%, ultrasonic power was 124 W, ultrasonic time was 24 min and initial ultrasonic temperature was 32 ℃. Under this condition, the anthocyanins extraction yield reached 23.62 mg/g. Compared with traditional solvents and other methods, the method is green, efficient and simple to operate. The results of stability and antioxidant experiments showed that light can accelerate the degradation of anthocyanins in the extract. When the temperature was higher than 50 ℃, the thermal degradation of anthocyanins accelerated with the first-order kinetic degradation constant k>0.0234. When the mass concentration was 200 μg/mL, the DPPH free radical scavenging rate and total antioxidant capacity of anthocyanins extracts were 62.30% and 6.39 mmol/L FeSO4·7H2O equivalent, and at a mass concentration of 30 μg/mL, the ABTS+ free radical scavenging rate of anthocyanins extracts was 85.14%. The antioxidant activity of anthocyanins extracts was significantly (P

Microfocus X-ray CT scanning (μCT) is one of the most effective methods for visualization of pore-fracture structure in rock, and its effectiveness in 3d imaging of pore-fracture in tight sandstone should be further explored.Taking the tight sandstone at the dam site of Baihetan Hydropower Station as an example, the pore-fracture 3D imaging characteristics of samples with different scanning accuracy were explored by using ultra-high precision μCT technology and segmentation algorithm, and their influence on obtaining key structural information was analyzed by SEM test.The results show that the combined segmentation method of interactive threshold and Top-hat can extract the pore and fracture information of tight sandstone more accurately. The interactive threshold segmentation method is suitable for the extraction of large pore and fracture, and the Top-hat segmentation method is suitable for the extraction of small pore.Small pores and microcracks are very developed in tight sandstone structure, and there are many isolated pores. Compared with 1.5 μm scanning resolution, 0.62 μm scanning resolution presents a clearer pore network model, but due to the limited testing range at the nanoscale, the key structural information properties may be magnified.Critical microstructure information may be missed when the scanning resolution is greater than 2μm.Therefore, in the study of three-dimensional characteristics of pores and fractures in tight sandstone, high scanning accuracy should be selected and multi-region information acquisition should be carried out to effectively reveal the key microstructure features. This basic work provides a support for further effectively revealing the structural evolution information of tight rocks.

BACKGROUND The quality of soil is directly related to human health and the safety of agricultural products, which has important references for agricultural planting and land planning. As an important vegetable basket base in Chengdu, Tangchang Town has developed agricultural planting, but the recent soil quality in the region is still unclear. OBJECTIVES In order to accurately understand the current content of nutrient and heavy metal elemental characteristics and soil quality grade of topsoil in the Tangchang agricultural planting area. METHODS According to 1∶50000 soil quality geochemical survey, 810 topsoil samples were collected. The contents of N, P, K, As, Cd, Hg, Pb, Cr, Ni, Cu, Zn, Se and pH in these soil samples were determined by X-ray fluorescence spectrometry, inductively coupled plasma-mass spectrometry, atomic fluorescence spectrometry, element analyzer and ion selective electrode method. The element geochemical characteristics and soil nutrient grade, soil environmental quality grade and comprehensive soil geochemical grade were then evaluated. RESULTS (1) Compared with the general topsoil in China, Zn and Pb in the topsoil of the study area are slightly enriched, Se is relatively enriched, N, P, Cd and Hg are strongly enriched. The topsoil is generally weakly acidic. (2) The comprehensive grade of soil nutrients is rich in second grade, accounting for 88.0% of the area, and the soil fertility is rich. The proportion of the first grade soil area in the environmental quality grade of the eight heavy metal elements in the soil is more than 96.0%, and the comprehensive environmental quality grade is dominated by first grade clean type, accounting for 98.06%. The comprehensive quality of soil is mainly grade one, accounting for 85.85%. (3) The area of selenium-rich soil in the region is 2.49km2, accounting for 3.7%, sporadically distributed in the central study area. Copper-rich soil area is 63.13km2, accounting for 94.0%, and zinc-rich soil area is 63.31km2, accounting for 94.17%. CONCLUSIONS In summary, the nutrients of topsoil in Tangchang Town are rich, the soil environment is clean and the comprehensive quality of the soil is high.

【Objective】The study aimed to explore the effects and application methods of dinotefuran, cyantraniliprole and spirotetramat in the control of Bemisia tabaci in Guangxi region, with a view to providing references for the control of B. tabaci in Guangxi.【Method】The control effects of dinotefuran, cyantraniliprole and spirotetramat on B. tabaci population on tomatoes in open field and greenhouse were compared by spraying and root irrigation.【Result】In open field tomato experiment, after treatment for 3 to 21 days, there was no significant difference in adult and nymph population density of B. tabaci among different treatments, which was lower than 0.53 whiteflies per leaf. After being treated with cyantraniliprole spray for 42 days, the adult population density of B. tabaci was 0.63 whiteflies per leaf, which was significantly lower than of that of the treatment without spraying any insecticide(CK)(1.41whiteflies per leaf). There were significant differences in the population density of B. tabaci nymphs among different treatments after treatment for 28 to 42 days. The population density of B. tabaci nymphs treated with dinotefuran, cyantraniliprole and spirotetramat or root irrigation with 3 times the amount of cyantraniliprole was lower than 0.31 whiteflies per leaf after treatment for 28 to 42 days. In the greenhouse, the cyantraniliprole or spirotetramat had a good control effect on the adults and nymphs of B. tabaci, especially in the 28 d and 42 d after spraying, the population density of adults and nymphs was significantly lower than that of CK. The nymph densities of were 0.33 whiteflies per leaf and 0 whitefly per leaf after being treated cyantraniliprole and spirotetramat for 28 days, while the density of nymphs in CK was 2.85 whiteflies leaf.【Conclusion】Cyantraniliprole had a good and stable control effect on the population of B. tabaci.The spray treatment with dinotefuran showed a good effect on B. tabaci on tomatoes in open field, while the spray treatment with spirotetramat in greenhouse showed a good long-term effect on the control of B. tabaci. At the same dose, the control effect of cyantraniliprole and spirotetramat on B. tabaci population by spraying was generally better than that by root irrigation. The control effect of cyantraniliprole on B. tabaci population could be improved by increasing the amount of root irrigation.

Aiming at the design difficulties of the key motion mechanism of the model supporting mechanism in the large-scale wind tunnel test， this manuscript proposes a new linear actuation transmission mode based on circular arc motion from the perspective of engineering practicality. This mode realizes the linear actuation function with a limited range of rotation， and overcomes the problems of high manufacturing cost and difficulty in installation and commissioning of large-size and high-precision worm gear pair in the past. To verify the effectiveness of this mode， a comprehensive analysis of the mechanism from aspects of dynamics of mechanism， kinematics of mechanism， control characteristics， stiffness and strength is conducted. At present， the design of the pitching movement transmission mechanism has been applied to the model mechanism of a large wind tunnel. The wind tunnel model has a pitch angle displacement range of 45°， and the radius of the circular motion reaches 2 800 mm. The integrated model features low cost and is easy to maintain.

BACKGROUND Selenium is one of the essential trace elements for humans. Eating agricultural products containing selenium is an important way for humans to obtain selenium. It is of great significance for the utilization of selenium-enriched soil resources and the development of selenium-enriched agricultural products to investigate the content characteristics of soil selenium, delimit selenium-enriched soil areas, and determine the influencing factors of soil selenium spatial distribution, migration and enrichment. OBJECTIVES To discuss the content, distribution characteristics and influencing factors of soil selenium in the study area. METHODS Tangchang Town in the Pidu District of Chengdu City was chosen as the study area. 788 surface soil samples (0-20cm) and 46 profile soil samples (100-150cm) were collected. The pH values and contents of Se, As, Hg, Cu, Pb, Zn, Ni, Cr, CD, TP, TK, TN and TOC in soil were determined by AFS, XRF and ICP-MS/OES. Geostatistical analysis, variance analysis, correlation analysis and geographic detectors were applied to systematically determine the content, distribution characteristics and influencing factors of soil selenium. RESULTS (1) Results showed that surface soil selenium content of Tangchang Town ranged from 0.082 to 1.10mg/kg, with an arithmetic mean value of 0.337mg/kg, which was 1.47, 4.02 and 1.16 times the average Se content of soil in Chengdu, Sichuan and China, respectively. (2) The Se-sufficient and Se-enriched topsoil reached 99.2% of Tangchang Town. In the profile soil samples, the soil selenium content decreased with increasing depth. In the spatial distribution, high selenium concentrate areas generally showed a northwest zonal distribution trend in Zhanqi Village, Baimu Village, Dayun Village, and Zhulin Village. (3) Correlation analysis showed that lead, chromium, nickel, cadmium, mercury, arsenic, total potassium, total nitrogen, pH, TOC and altitude were factors affecting spatial distribution variability of the soil selenium but varied in extent (P < 0.01). (4) The factor detection showed that TOC was the highest in the effect, explaining 0.29 of the variability, followed by Zn, which was 0.18, and the third was Cd, which was 0.16. Interaction detection showed the interpretation degree of the interaction between soil TOC and 17 influencing factors was more than 0.30, which was the dominant factor of spatial differentiation of selenium in topsoil. CONCLUSIONS The town is characterized by selenium-enriched soil resources; it is suggested to organically combine the selenium-enriched area with the characteristic industries of chives in Tangyuan to build an ecological chain of selenium-enriched industry, and further carry out collaborative analysis on the influencing factors of selenium migration and enrichment in soil crops.

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The quality of microseismic data greatly affects the accuracy of the source location results, especially in surface microseismic data where the first arrivals of P waves and S waves are not obvious or the low signal-to-noise ratio signals are difficult to identify.Secondly, due to the different focal mechanisms that induce microseismic, the signal characteristics received by different geophones are not the same.All of these factors have a certain impact on the accurate location of microseismic events.This paper proposes a method for selecting microseismic data based on cluster analysis to improve the imaging quality of microseismic event amplitude superposition locating.First, the Euclidean distance between the trace channels is calculated by cluster analysis, and the trace channels with larger and smaller distances are removed through the clustering graph, that is, trace channels with insignificant signal characteristics or severe noise interference are removed.Second, the cross-correlation calculation is performed on the signals of each channel, the trace channels with strong signal characteristic correlation being extracted, and those with unobvious P wave characteristics removed.Finally, the screened trace channels are superimposed and located with amplitude superposition.The comparison of the locating results with the original trace channels shows that the locating effect of the microseismic cluster analysis is more focused, the location of the focal point is clearer, and the locating results are significantly improved.

Objective To investigate the role and possible mechanism of mitochondrial DNA (mtDNA) release in the proliferation of rat pulmonary arterial smooth muscle cells (RPASMCs) induced by hypoxia. Methods ① RPASMCs were divided into normoxia group, hypoxia 24-hour group and hypoxia 48-hour group (n=3 for each groups), and the latter 2 groups were exposed to 1%O2 for 24 or 48 h respectively. ② Cyclosporine A (CsA) was used to inhibit the mitochondrial permeability transition pore (MPTP), and then the RPASMCs were divided into normoxia, simple hypoxia 48-hour and hypoxia 48-hour+CsA groups (n=3 for each). ③ SiRNA was adopted to knockdown the expression of stimulator of interferon genes (STING), and the cells were subsequently divided into normoxia+NC, hypoxia 48-hour+NC and hypoxia 48-hour+si-STING (n=3 for each). ④ The proliferation of the cells was measured by CCK-8 assay. The expression of cyclic GMP-AMP synthase (cGAS), STING and proliferating cell nuclear antigen (PCNA) at mRNA and protein levels was detected by RT-qPCR and Western blotting, respectively. Cytosolic mtDNA release was determined by qPCR, and the level of C-X-C motif chemokine ligand 10 (CXCL10) in the culture supernatant was tested by ELISA. Results Hypoxia induced RPASMCs to release mtDNA (P < 0.01), significantly up-regulated the expression of cGAS, STING and PCNA (P < 0.05), enhanced the secretion of CXCL10 (P < 0.01), and thus promoted the proliferation of RPASMCs (0.44±0.02 vs 0.72±0.03, P < 0.05). However, inhibition of MPTP blocked mtDNA release (P < 0.01), down-regulated cGAS, STING and PCNA (P < 0.01), and decreased CXCL10 level (P < 0.01) and hypoxia-induced proliferation of RPASMCs (0.74±0.12 vs 0.43±0.06, P < 0.01). The knockdown of STING also suppressed PCNA expression (P < 0.05), reduced CXCL10 secretion (P < 0.01), and inhibited the proliferation of RPASMCs (0.68±0.03 vs 0.58±0.01, P < 0.01). Conclusion Hypoxia can induce smooth muscle cells to release mtDNA and promote the proliferation of RPASMCs, which may be related to the activation of the cGAS-STING pathway.

Aiming at the low stroke times motion characteristics badly of beam pumping units，a reversing mechanism for gear guide-rod pumping units is analyzed. The reversing mechanism is mainly composed of a long rod incomplete gear，a rack moving frame，a roller and the like. Firstly，the gear guide-rod pumping unit reversing mechanism and its principle are introduced，and then the mechanical model of the reversing mechanism is established. Then，based on the contact impact algorithm，the joint dynamics simulation of the reversing mechanism is carried out by using Solidworks and Adams. The results show that，the speed of the reversing mechanism is gentle on the upstroke，and there is a sudden increase in acceleration on the downstroke. Comparing the acceleration simulation curves of the pumping unit under three different strokes，the pumping unit meets the requirements of low-yield wells production requirements. Comparing the acceleration theoretical curves of beam pumping unit and gear guide-rod pumping unit，the acceleration of the suspension point of the upstroke of this pumping unit is less than that of beam pumping unit，has better motion characteristics，and is suitable for low production well oil extraction operation. The change of stroke times has a greater impact on the contact force of components. At the same time，it provides data support for the subsequent strength calculation of the reversing mechanism.

Aiming at the problem that the measured signal of gear system can’t accurately reflect the fault characteristics due to noise interference， a fault identification method combining adaptive local iterative filtering and fuzzy entropy is proposed. By using adaptive local iterative filtering， the nonstationary signals of gears can be decomposed into finite stationary intrinsic mode functions. Since the adaptive local iterative filtering can effectively separate the rotating frequency signals of gear system， the fuzzy entropy of the first several intrinsic mode functions is calculated based on the intrinsic mode functions corresponding to the rotating frequency signals. Finally， grey relevance degree of the vibration signal’s fuzzy entropy under different working conditions is calculated to identify different fault types of gear system. The results show that the method can be effectively applied to the fault diagnosis of gear system.

The risks associated with pesticide residues on agricultural products cultivated in Cangnan County were assessed from 2020 to 2022. These risk assessments were performed utilizing the Index of Food Safety (IFS) and by calculating Hazard Risk Coefficients (R). Pesticide residues in 24 of the 977 samples (2.46%) exceeded the established standard. A total of 60 pesticides were detected, with detection rates >10% for 14 pesticides. The overall IFS of agricultural products in Cangnan is 3.83x10-2, indicating an acceptable safety level. Comprehensive evaluation suggests that enrofloxacin, 6-benzylaminopurine, 4-chlorophenoxyacetic acid sodium salt and gibberellin are associated with high risks, whereas carbendazim and bifenthrin pose moderate risks. SIC (Safe Intake of C) values were recalculated, yielding SI6-benzyladenine, SI4-chlorophenoxyacetic acid sodium salt, and SIgibberellin values for mung bean sprouts of 4.14x10-5 mg/kg⋅bw, whereas the SIbifenthrin for tangerine is 4.14x10-5 mg/kg⋅bw. The agricultural products produced in Cangnan are generally safe to consume. The safety of samples with residue levels exceeding the standard according to the IFSC results are considered unacceptable, and are subject to comprehensive assessment. Based on the maximum acceptable IFSC value (1) and pesticide residue levels on examined agricultural products, the SIC values for different agricultural products were recalculated to provide a scientific basis for quality and safety monitoring of agricultural products. Regulatory authorities need to intensify the supervision of high- and moderate-risk pesticides such as enrofloxacin, to strengthen control at points of sale and use of prohibited pesticides, including 6-benzylaminopurine, and to increase farmers' awareness of safe pesticide use. [ABSTRACT FROM AUTHOR]

ANSYS software was used for numerical simulation of stone wool melt in electric melting furnace. Under stable voltage 130 V, stable melt height 1 600 mm and stable inlet and outlet state, the insertion depth of cathode electrode was changed to study the temperature distribution, flow field distribution and current density distribution of the melting in electric melting furnace. The results show that the melt forms a high temperature zone between the cathode and anode and around the electrode, The temperature decreases from anode to cathode and from top to bottom on the symmetrical side of the inlet, while the temperature increases from top to bottom on the inlet side. With the increase of cathode insertion depth, the overall temperature and corresponding current density of the melt increase. The deeper the cathode insertion depth is, the greater the temperature rise of the whole temperature field is. At the inlet side and the outlet side, the melt forms a circulation due to natural convection, and the self-stirring and self-homogenization of the circulation have important technological significance for melt homogenization. Changing the cathode insertion depth can improve the melt control ability and improve the subsequent fiber forming effect and quality. [ABSTRACT FROM AUTHOR]

Objective To investigate the role of SRY-Box transcription factor 6 (SOX6)-suppressor of cytokine signaling 3 (SOCS3) on hypoxia-induced proliferation of human pulmonary artery smooth muscle cells (HPASMCs) and explore the possible mechanism. Methods ① The HPASMCs were treated with 4% O2 for 24 h or 48 h. ② siRNA was used to decrease the expression of SOX6 (si-SOX6-NC, si-SOX6-1, si-SOX6-2, si-SOX6-3) and SOCS3 (si-SOCS3-NC, si-SOCS3-1, si-SOCS3-2) in the cells. ③The HPASMCs with stable SOX6 overexpression induced by transfection with a lentiviral vector were exposed to hypoxia for 48 h, with the cells cultured in normoxia condition, or simple hypoxia condition as control. ④CCK-8 assay was used to testify the proliferation of the above groups of cells. The expression of SOX6, SOCS3, proliferating cell nuclear antigen (PCNA) and phosphorylated-signal transduction and activators of transcription 3 (p-STAT3) at mRNA and protein levels were detected by RT-qPCR and Western blotting, respectively. Results Hypoxia decreased the expression levels of SOX6 and SOCS3 (P

In order to solve the problem that the measured signal of gears cannot accurately reflect the fault characteristics due to noise interference, adaptive local iterative filtering is proposed to be applied to gear fault identification, which is combined with sample entropy and grey correlation to realize gear fault identification. By using adaptive local iterative filtering to decompose the gear non-stationary signal into a finite number of stationary intrinsic mode functions, and calculating the sample entropy of each intrinsic mode function, it is found that the sample entropy of the first few intrinsic mode functions can represent different fault types, bounded by the sample entropy of the intrinsic mode function corresponding to the frequency conversion signal of the gear system. The average value of the sample entropy of multiple training samples under four working conditions of gear system, including normal, mild tooth surface wear, moderate tooth surface wear and broken tooth, is calculated and used as the reference value of the standard failure mode of the corresponding working condition. The grey correlation between the sample entropy of the sample to be detected and the average value of the sample entropy of the training samples under each condition is calculated, and the standard failure mode with the largest grey correlation with the sample to be identified is considered as the failure type of the sample to be identified. The results of the case analysis show that the adaptive iterative filtering can suppress the modal aliasing phenomenon effectively and find obvious gear frequency conversion signals. On the other hand, the modal aliasing phenomenon is more obvious after the signal decomposition by EEMD method, and the frequency conversion component of the gear is basically invisible in the decomposition results of EEMD method. The obvious differences in the shapes of the sample entropy curves of the four working conditions indicate that the sample entropy can represent the changes of gear fault characteristics effectively. The grey correlation method, which can classify and identify the four different fault types effectively, has better classification identification performance than that of BP neural network and has better classification identification ability for small sample data.

Aiming at a hypersonic wind tunnel angle of attack mechanism， its special structural characteristics and kinematics are analyzed， and its parameter identification and control methods are studied. Firstly， the attack angle mechanism is modeled with kinematics， and the nonlinear kinematics models of pitch and yaw degrees of freedom are discussed. Aiming at the characteristics of many error factors in the pitch and yaw degrees of freedom transmission chain， the laser tracker is used to detect and the parameters in the kinematic model are accurately fitted with the nonlinear least square method. The experimental results show that， the parameter identification results meet the precise positioning requirements of the mechanism， the positioning accuracy is better than the accuracy index of 1'. In view of the characteristics of the nonlinear transmission of the pitch and yaw mechanism and the need for accurate control of the mechanism speed in the wind tunnel test， on the basis of parameter identification， the virtual axis， electronic cam and electronic gear technology are used to achieve the speed of pitch and yaw degrees of freedom precise control， speed control accuracy is better than the accuracy index of 0.5 （°）/s.

Objective To investigate the molecular mechanism of hypoxia-decreased NO secretion in vascular endothelial cells, and to explore the intervention role of butyrate (Bur) in the process. Methods Human umbilical vein endothelial cells (HUVECs) were divided into normoxia group (21% O2), hypoxia group (1% O2), hypoxia plus solvent control group, hypoxia plus Bur group (4 mmol/L Bur), hypoxia plus control siRNA group, and hypoxia plus HDAC3 siRNA group. The NO content in the supernatant was tested by NO Assay Kit. The mRNA expression of endothelial nitric oxide synthetase (eNOS) was detected by RT-PCR, and its protein level and that of histone deacetylase 3 (HDAC3) were measured by Western blotting. The interaction of HDAC3 to eNOS was analyzed by co-immunoprecipitation. Results Compared with the normoxia group, hypoxia for 6 h resulted in significant decrease in the NO level in the supernatant (P < 0.05), and reduced eNOS protein level though no change in its mRNA level. In the hypoxic HUVECs, HDAC3 protein level did not changed when compared with the normoxia group. Co-immunoprecipitation analysis showed that hypoxia induced the interaction of HDAC3 with eNOS, and suppressed the acetylation of eNOS protein. The level of eNOS protein was obviously increased in the hypoxia plus HDAC3 siRNA group than the hypoxia plus control siRNA group. Compared with the hypoxia plus solvent control group, the level of NO secretion and eNOS protein were increased significantly in hypoxia plus Bur group (both P < 0.05), but the interaction between the HDAC3 and eNOS was decreased and acetylation of eNOS protein was increased. Conclusion Hypoxia induces HDAC3-eNOS binding and inhibits acetylation of eNOS protein, which might be due to its destruction in eNOS stability and suppression in NO secretion. While, Bur treatment can reverse above process in vascular endothelial cells.

Objective To investigate the damage of seminiferous tubules in mice exposed to hypoxia and the effects of hypoxia on apoptosis of mouse spermatocytes in the seminiferous tubules. Methods Forty 3-week-old male Balb/c mice were randomly assigned into a normoxia group (housed in a normoxic condition at an altitude of 300 m) and 3 hypoxia groups exposed to hypoxia for 15, 30 or 60 d in a hypobaric chamber simulating the condition at an altitude of 6 000 m. After hypoxic exposures, the mice were euthanized and the testicular tissues were examined for pathological changes in the seminiferous tubules using HE and TUNEL staining. A mouse spermatocyte-derived cell line, GC-2spd, was also cultured in a normoxic condition or a hypoxic condition (1% O2 and 5% CO2) for 48, 60, or 72 h, and the cell apoptosis was detected using flow cytometry and TUNEL staining and by examining LDH, caspase-3, caspase-8, and caspase-9 levels in the culture medium. Results The apoptotic rates of the spermatocytes in the testicular seminiferous tubules of the mice increased significantly after hypoxic exposure for 15, 30 and 60 d as compared with the apoptosis rate of (4.6±1.4)% in the normoxia group (P < 0.01). In cultured GC-2spd cells, hypoxic exposure for 48, 60 and 72 h also significantly increased the cell apoptotic rate to (15.43±1.47)%, (44.10±14.10)% and (63.36±12.74)%, as compared with the rates of (4.18±1.40)%, (5.45%±2.30)%, and (14.47±8.21)% in the normoxia group, respectively (P < 0.01). Microscopically, the numbers of apoptotic spermatocytes per field were 22±3, 55±5, and 82±12 in the hypoxia group at 48, 60 and 72 h, respectively, significantly greater than those in the normoxia group (5±1, 8±2, and 15±4, respectively; P < 0.01). The absolute value of LDH activity in cultured GC-2spd cells at 48 h was significantly higher in the hypoxia group than in the normoxia group (1.28±0.18 vs 0.48±0.09, P < 0.01); the values of caspase-3/8/9 in the hypoxia group at 48 h were 12.20±0.40, 22.73±0.60, and 10.90±0.40, respectively, significantly higher than those in the normoxia group (7.67±0.45, 16.20±0.56, and 7.03±0.25, respectively, P < 0.01). Conclusion Exposure to hypoxia simulating the condition at an altitude of 6 000 m for 15 d can cause decreased spermatogenesis and increased apoptosis of the spermatogenic cells in mice, suggesting that spermatocyte apoptosis is one of the mechanisms by which hypobaric hypoxia reduces spermatogenesis.

Based on the analysis of influencing factors of tight gas recovery and reservoir geological characteristics, the types of remaining tight gas reserves in the Sulige gas field are summarized from the perspective of residual gas genesis to estimate residual gas reserves of different types and provide corresponding technical strategies for enhancing gas recovery. The residual gas reserves in the Sulige gas field can be divided into four types: well pattern uncontrollable, horizontal well missing, imperfect perforation, blocking zone in composite sandbodies. Among them, the uncontrolled remaining gas of well pattern and blocking zone in composite sandbodies are the main body for tapping potential and improving recovery factor, and well pattern infilling adjustment is the main means. Taking into account reservoir geological characteristics, production dynamic response and economic benefit requirements, four methods for infilling vertical well pattern, i.e., quantitative geological model method, dynamic controlled range of gas well method, production interference method and economic and technical index evaluation method, as well as a design method of combined vertical well pattern with horizontal well pattern are established. Under certain economic and technological conditions, the reasonable well pattern density of enrichment zone of gas field is proved to be 4 wells per square kilometers, which can increase the recovery rate of the gas field from 32% to about 50%. Meanwhile, five matching techniques for enhancing gas recovery aimed at interlayer undeveloped residual gas have been formed, including tapping potential of old wells, technological technology optimizing of new wells, rational production system optimizing, drainage and gas producing, and reducing waste production, which could increase the recovery rate for 5% based on well pattern infilling. The research results provide effective support for the long-term stable production of 230×108 m3/a of the Sulige gas field and production growth in the Changqing gas area. Key words: Ordos Basin, Sulige gas field, tight gas, remaining reserves, well pattern infilling, enhancing gas recovery, matching technologies

By analyzing the shock and spike voltage on the rectifier diode during converter process of the phase-shift full bridge ZVS DC/DC converter which is configured as full wave rectifier in second side, this paper aims at explaining the reason of shock and spike voltage after that equivalent circuits and mathematical models are established. Then by analyzed the mathematical model, we thus conclude that a relationship is between parasitic parameters and resonance oscillations. And last RCD snubber circuit experiments are carried out in Saber and experiment prototype of 500 W which proves resonance oscillations can be curbed effectively.

Objective To observe hypoxic injuries in 7 cell lines derived from different human tissues to identify a cell model that is sensitive to acute hypoxic injury. Methods Seven cell lines derived from different human tissues, namely CCD 841 CoN, GES-1, HUVEC, HEB, HEK-293, HBE and L02, were exposed to different oxygen concentrations (1% and 5%) for 24 h using a hypoxia workstation. CCK-8 and LDH kits were used to assess the cell proliferation and cell injuries. The cells were then treated with rhodiola (0.625 μmol/L, 2.5 mmol/L) and 3-n-butylphthalide (1, 2 μmol/L) at the start of hypoxic exposure to assess the protective effects of the drugs against hypoxic cell injuries. Results Compared with the cells cultured in normal oxygen concentration (21%), HEB cells exposed to 1% O2 for 24 h showed significantly lowered proliferative activity (P < 0.05). Hypoxic exposure to 5% or 1% O2 for 24 h significantly increased LDH activity in the culture supernatant of HEB, HUVEC, HBE, HEK-293, CCD 841 CoN, GES-1 and L02 cells (P < 0.05 or 0.01). In HEB cells cultured under hypoxic conditions, treatment with rhodiola and 3-n-butylphthalide significantly promoted the cell proliferation and improved the cell viability (P < 0.05), and obviously reversed hypoxia-induced increase in LDH activity (P < 0.05 or P < 0.01). Conclusion Among the 7 cell lines tested in this study, HEB cells are the most sensitive to hypoxia and can serve as an ideal model for studying drug interventions of hypoxic cell injuries.

The essential requirement of alignment design system includes integration of massive geographic information, various modes of interactive operation, multiple expression and observation manners for alignment scheme. This paper sets up a 3D virtual city through an open source toolkit named osgEarth; integrates various GIS data affecting route scheme inside a 3D virtual scene after process; proposes a dynamic modeling method for objects in virtual city scene; supplies approaches to edit horizontal and vertical alignments through interaction interface of the scene and QT view framework. Based on stretch method from cross section of structures, the proposed technique could create simplified BIM models of subgrade, bridge, and tunnel to express the design idea of alignment engineer. Benefit of the compatibility of 3D modeling files, the complicated station models could be rendered. The scene efficiency is improved by LOD technique. The research results show that the proposed 3D alignment design system could make sure the rendering fluency after multi-source data integration in the scene, and could realize synchronous 3D design for many projects and schemes. [ABSTRACT FROM AUTHOR]

On October 6, 2021, a high-position landslide disaster occurred in Yanwo Village, Rongshan Town, Lizhou District, Guangyuan City, Sichuan Province, around 13: 00. The landslide resulted in the destruction of 4 houses, 3 power lines, the burial of a 170-meter-long rural road, and the blockage of a 350-meter-long river channel. By utilizing a variety of remote sensing information sources, including multi-period satellite data before and after landslide, high-precision UAV aerial images, and airborne LiDAR data, the characteristics of high landslide and its sliding mode are studied by using a four-dimensional analysis approach combining three-dimensional space with time. Starting from the development background of high landslide, the deformation and failure characteristics and sliding mode of high landslide are summarized by analyzing the deformation characteristics before sliding and the dynamic procession of the high landslide. Based on the deduced landslide progression and the stability evaluation of the residual landslide at the rear, three sliding modes for future high-position landslide events are predicted and analyzed: Firstly, the back edge of landslide continues to be disjointed and move, causing a direct shear failure of the front part of the landslide by squeezing. Secondly, the trailing edge of the landslide continues to be disjointed and move, resulting in the sliding landslide occurs along the existing landslide channel. Thirdly, the initiation of the front part of the landslide trigger a tractional landslide in the middle and rear parts of the landslide. High-position landslides are common in the southwest mountainous areas, and during early geological hazard investigations, they should be effectively identified, and disaster prevention and mitigation measures should be strengthened. [ABSTRACT FROM AUTHOR]

Taking the carboniferous reservoir of Wubaiti gas field in eastern Sichuan Basin as an example, the technology strategies are proposed about the following major problems during the middle to late stage of gas field development: imbalance development, low permeability and low efficient reserves left with low producing degree, unreasonable proration caused by changes of gas well dynamic productivity, universal water production in gas wells, high reserve recovery and composite decline rate of reserve-rich region, and lack of new methods for reserves producing evaluation and remaining reserves distribution prediction. The development technical strategies for Wubaiti gas field are as follows: (1) stratigraphic subdivision and structural description in which fault and tectonic fluctuations are describe based on seismic interpretation data; (2) division and quantitative characterization of reservoir units in which the reservoir shape, scale, connectivity and gas-bearing range are evaluated according to dynamic and static data; (3) fluid distribution and dynamic response analysis in which gas-water distribution pattern is figured out by combining structure, reservoir and gas well production dynamic characteristics; (4) reserves producing degree evaluation and deliverability review in which reserves producing degree and remaining recoverable reserves scale are evaluated from the perspective of static geological reserves and dynamic reserves, to make clear the direction of the next step production and establish rational production system in the late stage; (5) static geological model establishment and dynamic correction in which gas reservoir pressure and remaining reserve distribution are predicted by using fine 3D geological modeling and numerical simulation; (6) remaining reserves prediction and classified evaluation based on the dynamic revision prediction model to guide the recovery of remaining reserves; and (7) gas production technology and equipment development, targeted gas recovery techniques are provided concerning the mature gas field. Key words: eastern Sichuan Basin, Wubaiti gas field, reservoir description, gas field development, remaining reserves, deliverability enhancement, technical strategies

The Carboniferous-Permian strata in Henan Province are a set of coal-bearing series of transitional marine-continental facies，of which the mudstones have potentials for shale gas exploration.The mudstones are characterized by a variable thickness of the individual effective mudstone layer and a huge accumulative thickness.In this paper，we utilized the outcrop and borehole core data and investigated the accumulation conditions and the reservoir characteristics of the shale gas in the Carboniferous and Permian coal-bearing strata of Henan Province.The total organic carbon(TOC)，organic matter types，thermal evolution degree，contents of brittle minerals and clay minerals，and pore morphological types of the mudstones were determined by the TOC analyzer，microscopic identification of kerogen，reflectance measurement of vitrinite，X-ray diffraction(XRD)，low temperature nitrogen gas adsorption，respectively.The results showed that the abundance of organic matters of the mudstones was relatively high，with the TOC contents in the mudstones of the Taiyuan，Shanxi and Xiashihezi Formations being 0.95% ～8.04%，0.78% ～9.41%and 0.2% ～ 2.13%，respectively.The types of organic matter were dominated by typeⅢ，followed by typeⅡ2.The thermal evolution degree ranged from mature to over-mature stage which was favorable for the formation of dry gas.The maturity of the mudstones had a zoned distribution，with the highest maturity being distributed along the Jiaozuo-Zhoukou belt and the lower maturity being distributed towards the south and north from this belt.The XRD analysis showed that the clay minerals of the mudstones could account for 62.0%while the brittle minerals only accounted for 34.1%，indicating that the mudstones had a higher gas adsorption capacity but were difficult for hydraulic fracturing.The clay minerals were mainly composed of 57.1%of illite/smectite mixed layer and 23.5%of kaolinite，which were beneficial to the formation of pore space.The porosity of the mudstones ranged from 1.0%to 4.5%，and the permeability varied between 0.003 and 0.032 mD.The experiment of low temperature nitrogen gas adsorption revealed that the morphological types of the pores included the parallel plate-slit pores and the inclined plate-slit pores.The meso-pores provided the vast majority of specific surface area and total pore volume.The gas contents could reach 1.0 ～3.0 m3/t which is suitable for the condition of shale gas reservoir.It was concluded that the siliciclastic member in the middle Taiyuan Formation(H1)and the basal part of the Shanxi Formation(H2)have a higher hydrocarbon potential.The major favorable exploration areas are those having a good preservation condition or a less serious influence from the regional thermal events.

Silane and ethylene were deposited on the surface of conductive carbon black by fluidized-bed method, and then solid phase sintering was used to prepare the silicon carbon co-coated conductive carbon black anode material for lithium ion batteries with excellent cyclic properties. The process parameters of silane and ethylene co-deposition were optimized by fluidized bed. The inlet ratio, silane concentration, codeposition temperature and solid sintering temperature of silane and ethylene were obtained. The phase, microstructure and electrochemical properties of the samples were characterized. The test results show that when the silane and ethylene feed ratio is 2:1, the codeposition temperature is 500 °C, and the solid phase sintering temperature is 800 °C, the co-coated conductive carbon black has the best performance as the anode material of lithium-ion battery. The charge and discharge efficiency of the first circle is 88.19%, and the specific charge and discharge capacity of the first circle is 2 205.0 mAh/g. After 25 cycles, the specific capacity of charge and discharge is 1010.0 mAh/g. [ABSTRACT FROM AUTHOR]

[Objective] This study aimed to develop new rice materials against blast and bacterial blight. [Method] The female parent was Xiangyaxiangzhan and the male parents were Shuangkang 77009 with rice blast resistance gene Pigm-1 and 1RBB23 with bacterial blight resistance gene Xa23. With the help of molecular marker-assisted selection breeding, the target genes were detected in the isolated generation. Combined with multi-generation selection and resistance identification in the field, five stable lines with multiple resistance and excellent comprehensive characters were selected and analyzed for their agronomic characters. Then, Liangxiang A, a three-line sterile line, was crossed with Xiangyaxiangzhan and five stable lines, respectively. The agronomic and quality traits of the crosses were analyzed, and the restoration genes of the five stable lines were detected. [Result] The five stable Xa23 and Pigm-1 lines showed good resistance to blast and bacterial blight. Among the crosses between sterile line Liangxiang A and five stable lines, only Liangxiang A/R21-1 combination showed normal fruiting, while other combinations were semisterile. Compared with parent R21-1, the Liangxiang A/R21-1 combination showed better characteristics regarding numbers of effective panicles and spikelets per panicle. The head rice rate and chalkiness degree were also significantly improved, and rice quality reached the level of secondary high quality rice issued by the government. [Conclusion] Five stable Xa23 and Pigm-1 double gene polymerization lines were created and the improved variant R21-1 with Rf3 gene could be used in rice polygenic polymerization breeding. [ABSTRACT FROM AUTHOR]

The chemical characteristics and occurrence state of formation water in western Sulige gas field were analyzed based on geological features of reservoirs, the gas and water distribution regularity and the main controlling factors were determined. Aquifer zones are widely distributed in the whole Western Sulige gas field, gas zones developed poorly and distributed limitedly. Vertically, gas and water zones are of poor continuity and distributed in an isolated and staggered pattern. Inside the gas reservoir, there is not a uniform gas and water interface because of the hard differentiation between gas and water. On the whole, the lower segment of H8 Member in Shihezi Formation and S1 Member in Shanxi Formation are both better than the upper segment of H8 Member. Gas and water distribution of Western Sulige gas field is mainly controlled by gas-generating intensity, the distances between reservoirs and hydrocarbon source rocks, configuration relationship of sand shale and physical property differences inside sand body complex. Among them, gas-generating intensity mainly controls the macro pattern of gas and water distribution, with the decrease of gas-generating intensity, good gas accumulation gradually changes to be water associated gas reservoir. The closer the distance between reservoirs and hydrocarbon source rocks, the more developed the gas zones, on the contrary, the gas-bearing water zone and coexisting gas and water zone are more developed. Sand shale configuration relationship and physical property differences inside sand body complex mainly control the local gas filling and accumulation. Five types of gas and water distribution patterns are summarized: pure gas, thick reservoir with mixed gas and water, water above the gas, gas above the water, and gas sandwiched between water. Key words: Ordos Basin, western Sulige gas field, tight sand gas, formation water, gas and water distribution, controlling factors

The paper introduced maintenance categories of coal mine machinery, pointed out predictability maintenance and initiative preventability maintenance based on fault diagnosis technology are development mainstreams of maintenance of coal mine machinery, expounded several popular fault diagnosis methods of coal mine machinery, and further summarized research hotspots and development trend of fault diagnosis technologies of coal mine machinery.

Background and objective For the assessment of elderly patients can tolerate lung cancer operation, there is no clear standard. To evaluate the clinical validity of POSSUM (Physiological and Operative Severity Score for the Umeration of Mortality and Morbidity) in elderly non-small cell lung cancer (NSCLC) surgery patients, we want to provide an important basis for operation treatment decisions. Methods A total of 138 patients, with 88 males and 50 females, with elderly NSCLC surgery between December 2007 and December 2013, are included in PLA general hospital. Using the multivariate Logistic regression analysis, we evaluate the value of each factor on the actual postoperative complications mortality and morbidity. The scorings on standard POSSUM and modified POSSUM in the complication group are compared with the non-complication group using the group t test. Drawing receiver operating characteristic (ROC) curve in standard POSSUM group and modified POSSUM group, calculating the area under the curve (AUC), AUC in standard group is compared with modified group using t test. Judge if the modified POSSUM prediction is consistent with the actual mortality and morbidity. Results Among 138 patients, there were 77 postoperative complications in 59 patients, 2 cases of death. According to the Logistic regression analysis, 17 of 18 factors in standard POSSUM, pulmonary function, different TNM stage are predictors for postoperative complications (P

The dual lead cylindrical worm drive is suitable for high precision indexing and rotary servo axis etc engineering applications。In the light of renovation requirements of a wind tunnel mechanism,based on the analysis of the equipment characteristics and the characteristic of existing drive mechanism,the existing mechanism is replaced by using the dual lead cylindrical worm. The related key point design is analyzed,the new mechanism obtains good use effect.

Karst cracking is currently one of the key geological problems that are of great concern to the world, and it urgently needs to be effectively solved. Microbial mineralization-induced calcium carbonate precipitation (MICP) technology has the advantages of low energy consumption, many types, and environmental friendliness. In recent years, it has been used by many scholars in the research of rock fracture repair. This article mainly elaborates and summarizes the research status of MICP technology in the process of rock fracture repair and the influence of microorganism types and concentration, cementing fluid, construction technology, etc. on the MICP repair effect. At the same time, it also discusses the application of traditional repair materials in karst cracks. The existing problems are also summarized accordingly, in order to promote the practical application of MICP technology in the repair of karst cracks. [ABSTRACT FROM AUTHOR]

Objective · To evaluate the effects of inhaled nitric oxide on renal injury and hemorrhage after surgery. Methods · China National Knowledge Infrastructure (CNKI), Chinese Biomedical Literature Database (CBM), WanFang Data, PubMed, Embase, Web of Science and The Cochrane Library were searched systematically from the establishment of each database to March 26, 2021. "外科手术" and "一氧化氮" were used as Chinese keywords for retrieval. Correspondingly, the "nitric oxide" "surgical procedures, operative" "cardiac surgical procedures" "cardiac surgery" and "transplantation" were used as subject words and free words for searching. The literatures were screened according to the pre-established inclusion and exclusion criteria. Meta-analysis was performed by using RevMan 5.3. The study end points were the incidences of renal injury and hemorrhage. Results · Seven literatures were included for analysis, with a total of 689 surgical patients. Of them, 337 received nitric oxide treatment and 352 received placebo treatment. Compared with the control group, patients treated with nitric oxide demonstrated a statistically difference in reducing the incidence of postoperative renal injury (RR= 0.75, 95%CI 0.61-0.92, P=0.005). There was no significant difference in the incidence of hemorrhage (RR=0.79, 95%CI 0.22-2.83, P=0.710) between the two groups. Conclusion · Application of nitric oxide after surgery does not increase the risks of renal injury and hemorrhage. In contrast, the use of nitric oxide in cardiopulmonary bypass might protect renal function. [ABSTRACT FROM AUTHOR]

The spatial representation model based on multi-scale grid cell population is proposed to solve the problem of using grid cells for spatial representation without environmental information. By reducing the preference orientation, the grid cells have a specific inductive direction and only respond to the velocity in a specific direction. We construct a multi-scale grid cells model based on the improved model to represent the environment. The results show that the improved grid cell model only responds to the velocity in the corresponding direction, integrates the velocity information accurately, represents part of the unexplored region, and is applicable to one-dimensional and two-dimensional space without environmental information. In the area of 100 m x 100 m, the results' error does not exceed 0.2 m. It is proved that the improved model expands the scope of characterization of grid cells and improves the representation's accuracy and ability. [ABSTRACT FROM AUTHOR]

Using V2O5 as raw material, oxalic acid as reducing agent, a series of nano-VO2(B) samples with different oxalic acid concentrations (c(H2C2O4)/c(V2O5) =x, 1.00 ≤x≤2.50) were prepared by hydrothermal method. The structure, micro-morphology and electrochemical performance of the prepared samples were characterized and analyzed. The results showed that the prepared samples were all pure phase VO2(B) with monoclinic structure; with the increase of the concentration of reducing agent, the morphology of the VO2(B) sample gradually changed from smaller nanoplates to larger nanorods; the structural defects of VO2 (B) samples were mainly micropores; the obtained VO2 (B) samples all had good cycle stability and reversibility. Among them, the VO2(B) sample obtained with x = 1.75 had smaller redox peak potential difference (0.111 V) and smaller resistance (0.770 Ω), and when the current density was 30 mA/g, the VO2(B) sample had the largest specific capacitance value (105. 00 F/g), showing better electrochemical performance. [ABSTRACT FROM AUTHOR]