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This study investigates the correlation between 129Xe ventilation functional MRI and CT-detected pulmonary lesion types. We performed 129Xe ventilation functional MRI and CT scans on a sample of 143 patients, subsequently analyzing the relationship between lung ventilation function at the lobe level and CT lesion types. The findings suggest that the ventilation function from 129Xe MRI was consistent with CT results in the majority of lung lobes (74.6%). The ventilation function impairment of lung correlates with CT lesion types, particularly in instances of mixed diseases and emphysema/bullae, which are more prone to induce lung ventilation dysfunction. Moreover, distinct ventilation patterns are observed among different lesion types. That is, the data from both 129Xe ventilation functional MRI and CT provide complementary insights. The preliminary finding of this study offers data support for evaluating lung ventilation function caused by lung lesions, and provides more references for clinical imaging diagnosis, thereby contributing to the refinement of diagnostic and therapeutic strategies for pulmonary diseases.

Objective·To assess the levels of pregnancy-related stress, pre-pregnancy health care behaviors, and coping styles among pregnant women,analyze the influencing factors of pregnancy stress and provide insights for the management of pregnancy health in expectant mothers.Methods·A total of 265 pregnant women receiving treatment at the Obstetrics Clinic of the Affiliated Hospital of Zunyi Medical University from April to August 2022 were included as participants. General information questionnaires, pre-pregnancy health care behavior questionnaires, pregnancy stress scales and simple coping style questionnaires were utilized for data collection. After obtaining the consent of the patients, assessments on pregnancy stress levels, pre-pregnancy health care behaviors, and coping styles were conducted.Results·The overall average score for pregnancy stress among pregnant women was 1.05±0.41. Multiple linear regression analysis revealed that age, number of pregnancies, history of threatened abortion, fetal gender expectations, attending prenatal education classes or reviewing relevant manuals significantly influenced pregnancy-related stresses (P

This study investigated the effect of salicylic acid (SA) treatment on preserving the color and nutritional quality of broccoli during postharvest cold storage. The results demonstrated that SA treatment significantly delayed the yellowing process, increased chlorophyll content, −a*/b* value, quantum yield (Fv/Fm), and fluorescence decline ratio (Rfd) and decreased L* value and yellowing index compared with untreated control. Meanwhile, the losses of glucoraphanin (GRA), glucobrassicin (GBS), sulforaphane (SFN), indole-3-methanol (I3C), and ascorbic acid (AsA) were obviously alleviated in the treated samples, and the accumulation of total phenols and total flavonoids was significantly increased. In addition, the total antioxidant capacity (T-AOC) of the treated samples was improved remarkably and the content of malondialdehyde (MDA) was significantly reduced. Multivariate statistical analysis visualized the distribution of sensory and nutritional variables in both groups of samples, further demonstrating that SA treatment was more effective in preserving GRA and AsA and effectively induced an improvement of the antioxidant capacity.

To enhance the effectiveness of load-source coordinated control， it is essential to investigate how to allocate regulation tasks to load aggregators in a way that aligns with their regulating characteristics. This research identifies the inevitable breaches in the day-ahead scheduling process under the load aggregator model， arising from constraints imposed by the characteristics of load terminals. Building on this， an indicator for load aggregators is established to quantify their resource flexibility. Subsequently， a day-ahead scheduling method considering the resource flexibility of load aggregators is proposed. In this approach， the grid determines corresponding compensation prices based on the load aggregators’ resource flexibility. This allows for the allocation of regulation capacity while attempting to maintain the desired regulating curve for load aggregators with low flexibility. By doing so， it aims to reduce the inevitable default energy by load aggregators， while avoiding the potential large amount of default energy resulting from allocating regulation capacity based on breach rates. The effectiveness of the proposed method is validated through a case study.

With the continuously challenges of energy and environmental, the development of distributed power generation technologies focused on renewable energy is rapidly advancing. Microgrid based on inverter power source is the important form of distributed generation, but it is difficult to isolate faults selectively and accurately when short circuit fault occurs in grid, and will result in overall shutdown. Aimed at the characteristics of inverter power sources and microgrid structures, a protection method based on equivalent distance for lines of source-grid-storage microgrid is proposed. Realtime information of the fault line is modulated into the terminal frequency by modulation techniques. Subsequently, virtual short-circuit currents are obtained via demodulation techniques, and fault distances are measured through equivalent internal potential. It is verified by theoretical analysis and simulation experiments in four tipical cases, such as single power source circuits, and this method can effectively calculate virtual short-circuit currents. These currents are equevlant to the virtual currents output when traditional rotating motors act as power sources. The proposed method can use the aforementioned virtual short-circuit current to determine the distance between the inverter power source and the fault point.

With the increasing penetration of wind power in power grids, it is necessary for wind storage joint farms to participate in power grid frequency modulation to maintain frequency stability of the power grid. By analyzing the mechanical characteristics of the wind turbine and the operation characteristics of the energy storage system, this paper determines the adjustability of the wind turbine power output in the pitch angle load shedding operation mode, and proposes a control strategy for the wind farm with an energy storage system to participate in the secondary frequency regulation of the power grid based on model predictive control (MPC). It establishes a prediction model for pitch angle control of the wind farm and an electrochemical energy storage system, optimizing the active power output of the wind turbine and the energy storage system, and better reducing the wind energy loss based on frequency regulation. The pitch angle control is further corrected based on the difference between the active power command value of the superior system and the actual power output of the wind turbine, so that the wind turbine can better track the power command value of the superior system during secondary frequency regulation, quickly respond to the frequency changes, reduce the dynamic frequency deviation, avoid load rejection due to too low frequency drop, and complete the task of secondary frequency regulation. The simulation results show that under the control strategy proposed in this paper, the controllable secondary frequency regulation ability of the wind turbine and the characteristics of fast response and accurate tracking of the energy storage system are comprehensively considered, the active power command issued by the superior system is better tracked, and the task of the wind farm including the energy storage system participating in the secondary frequency regulation is realized.

ObjectiveThe aim of this study was to evaluate the serotype， drug resistance， and molecular typing characteristics of Salmonella isolated from patients with foodborne diseases in Guizhou Province in 2021.MethodsA total of 164 Salmonella strains were isolated from patients with diarrhea under the Guizhou Provincial Active Surveillance of Foodborne Diseases program in 2021. These strains were subjected to slide agglutination serotyping test， minimum inhibitory concentration tests with 14 antibiotics， and pulsed-field gel electrophoresis （PFGE） for molecular typing.ResultsThe 164 Salmonella strains were divided into 25 serotypes. The dominant serotypes were S. typhimurium （46.34%，76/164）， S. enteritidis （15.24%，25/164）， and S. javana （9.15%，15/164）. The drug resistance rate of the 164 Salmonella strains was 100% （164/164）. The multidrug resistance rate was 86.59% （142/164）. Out of the 15 antibiotics tested， resistance was most frequently observed against ampicillin （95.12%，156/164）， tetracycline （78.05%，128/164）， and nalidixic acid （63.41%，104/164）. Seventy-two S. typhimurium， 24 S. enteritidis， and 15 S. javana strains were divided into 58， 12， and 3 different PFGE clusters， respectively.ConclusionThere were many Salmonella serotypes detected in patients with diarrhea in the Guizhou Province， and multidrug resistance was common. PFGE fingerprints demonstrated genetic diversity of the isolated strains. Monitoring of drug resistance in Salmonella should be strengthened， especially for the clinical treatment of S. typhimurium.

Biotechnology is crucial for the sustainable development of the aquatic seed industry. Therefore, improving the innovation capability in aquatic breeding and making seed sources independent are significant for ensuring food security in China. This study summarizes the development status and problems of aquatic breeding in China and analyzes the status of research and application of seven types of biotechnology for aquatic breeding, namely, transgenic breeding, ploidy breeding, molecular-marker-assisted breeding, genomic selection breeding, genome editing breeding, molecular design breeding, and germline stem cell transplantation; future research and development demand for these technical fields in China is further analyzed. Moreover, future development goals and major tasks are suggested, including collecting, preserving, and accurately identifying excellent germplasm resources of aquatic organisms, profoundly analyzing the genetic basis and regulatory mechanism of critical traits, developing efficient and accurate breeding technologies, and achieving breakthroughs in the creation of new varieties. Furthermore, following suggestions are proposed: optimizing development policies of the aquatic seed industry, promoting technological innovation in aquatic breeding, establishing platforms for aquatic variety creation and transformation, and setting up special projects to accelerate technological innovation and development of the aquatic seed industry.

Objective·To evaluate the long-term performance and influencing factors of auditory and speech abilities, and social-life abilities in congenital deaf children with cochlear nerve deficiency (CND) after cochlear implant (CI) surgery.Methods·Twenty-one CND children with CI implantation in Shanghai Ninth People′s Hospital, Shanghai Jiao Tong University School of Medicine were assigned to CND group, and twenty children with extremely severe sensorineural hearing loss with normal inner ear structure matching implantation age and CI use time of the CND group were selected as control group. The aided hearing threshold, Infant-toddler Meaningful Auditory Integration Scale (IT-MAIS), LittlEARS Auditory Questionnaire (LEAQ), Categories of Auditory Performance-Ⅱ (CAP-Ⅱ), Meaningful Use of Speech Scale (MUSS), Speech Intelligibility Rating (SIR), closed and open disyllabic speech recognition test, and speech intelligibility test were used to hierarchically evaluate the subjects′ auditory and verbal abilities, and the Infant-junior Middle School Student′s Social Life Ability Scale (S-M Scale) was used to assess the subjects′ social-life ability.Results·The average aided hearing threshold of each frequency point in the CND group was significantly worse than that of the control group (all P

Protein is an important nutrient required by the human body. The change of protein structure during processing will lead to changes in its functional properties, in turn affecting the quality of foods. There are many physical methods available to alter the structure of proteins to expand their application in the food industry. The new electrophysical processing technology has become a hot spot in the field of food processing due to its advantages of high efficiency, low energy consumption, and slight loss of nutrients. Therefore, this paper reviews the effects of electric field technology (ohmic heating and electrostatic field) and electromagnetic field technology (microwave, radio frequency and magnetic field) on the change of protein structure at multiscales (macroscopic, molecular and microscopic levels), in order provide a theoretical basis for the development and utilization of electromagnetic field processed protein products.

Aiming at the problem that the traditional SATA controller has a single interface and cannot give full play to the performance of the SSD, a multi-channel high-speed storage circuit based on PCIE to SATA is designed. This design makes full use of the high-bandwidth and low-latency characteristics of the PCIE bus and follows the AHCI protocol, which can greatly reduce the useless seek times and data search time of the hard disk, and improve the read performance. At the same time, the design can support 4 SATA channels and has good scalability. This design combines the characteristics of PCIE and SATA protocols, introduces the system architecture of PCIE to SATA high-speed storage circuit, and elaborates the data stream transmission process based on AHCI protocol. Finally, the circuit is tested based on the FPGA prototype verification. The single-disk read and write rates of the circuit are 562MB/s and 527MB/s, respectively. Compared with the traditional SATA controller, the read and write performance is greatly improved. The test results show that the designed PCIE to SATA high-speed storage circuit has excellent read and write performance, and has good stability and scalability.

The convenience and efficiency of cloud computing have brought great potential for its development.More and more enterprises and individuals obtain real benefits by using various outsourcing services provided by cloud computing.In order to protect the confidentiality and integrity of outsourced data in the cloud,the keyword search over encrypted cloud data with privacy protection and integrity verification is becoming a research hotspot in the field of cloud computing.In this paper,we focus on the issue of the verifiable keyword search over encrypted data.The system models,threat models and frameworks adopted in the existing works are firstly introduced.Related works are overviewed from the aspects of verifiable single keyword search and verifiable multi-keyword search over encrypted data,and the ideas of these works are briefly described together with the advantages and disadvantages.At last,the conclusion is presented through a comprehensive analysis and comparison of the related works,and the possible research directions and trends in the future are prospected.

Low-frequency transmission system (LFTS) based on modular multilevel matrix converter (M3C) has great application potential in offshore wind power transmission,urban power grid and long-distance power transmission. In order to study the startup process and the control strategies of LFTS and connect the converter station to the low-frequency transmission line without voltage or current impulse of M3C,a startup method of undisturbed grid connection is proposed. Firstly,the structure and operating principle of the LFTS are analyzed. Then,the selection principle of sub modules and the charging process of M3C are analyzed with two-terminal LFTS as the target. Taking the advantage that the blocked M3C does not exchange power with the low-frequency power grid when the capacitor is at rated voltage,the problems of over-voltage and over-current that tend to occur during LFTS startup can be solved by flexible control of M3C and reasonable design of startup strategy,without additional control devices and detecting the synchronization of the breaker. Finally,a real time digital simulation system (RTDS) is built to verify the proposed startup method. The simulation results show that converter stations connect to the low-frequency transmission line without voltage or current impulse. Also,the proposed strategy is correct and has a great prospect of the engineering application.

The Yangchang phosphate deposit in Zhenxiong County, Yunnan Province is a super large sedimentary phosphate deposit evaluated in recent years in the Early Cambrian period. It is characterized by large resource re-serves, excellent ore quality, and concentrated resource distribution, and is currently the largest hidden single rich phosphate deposit in Asia. This article mainly uses different analysis methods to conduct systematic mineralogical research on the chemical composition, mineral composition, embedding characteristics, embedding particle size and intergrowth relationship, dissociation degree of the phosphate ore in the deposit. The grinding fineness and ore sorting process methods are also preliminarily explored. Our results show that the samples in this study are high-grade silicon calcium carbonate phosphate ore, with a P2O5 content of 29.34%. The main P-bearing mineral in the ore is fluorapatite which commonly distribute as hidden crystal microcrystal aggregates (commonly known as collophane). The main gangue minerals are quartz, calcite, dolomite, and a small amount of pyrite. The ore is characterized by low magnesium and low silicon, and can be processed using the direct-reverse flotation method. The ore has fine particle size and complex interrelationships, making it difficult to dissociate. During the beneficiation, fine grinding is required to increase the degree of monomer dissociation, but the impact of mechanical entrainment and mud formation caused by excessive grinding on flotation indicators should be paid special attention. The ore has reached the phosphate concentrate index and can be directly processed and utilized. If beneficiation is required, it is recommended to focus on studying the grinding process and exploring joint beneficiation methods to achieve the desired beneficiation effect. [ABSTRACT FROM AUTHOR]

The Yangchang phosphate deposit is a large-buried shallow marine carbonate stratified phosphorite deposit discovered in the Meishucun Formation (∈1 ms) of the Lower Cambrian recently. The understanding of its sedimentary environment and enrichment mechanism is still limited. Representative borehole cores were selected to carry out systematic sedimentary facies cataloguing. By means of sedimentary (microfacies) analysis, mineralogy acand mineral chemistry tracing, the characteristics of rock and mineral (assemblage), sedimentary (microfacies) types, sedimentary environment and spatial and temporal distribution of each lithologic section of the Meishucun Formation are analyzed. We also studied the sedimentary environment evolution, the source, migration and enrichment mechanism of phosphorus, and its metallogenic model. The comparative analysis shows that the ore-bearing strata exhibits the nearshore tidal flat facies sedimentary environment with transgression-regressive sequence vertically, 6 microfacies types in 3 subfacies namely supratidic flat, intertidal flat and subtidal flat are identified. Su-pratidic flat is divided into supratidic flat and supratidic carbonate flat. The intertidal flat is divided into intertidal carbonate flat, intertidal flat and storm current. The subtidal flat developed a low energy subtidal flat. The favorable phosphorus formation environment is the high energy intertidal flat in intertidal flat. Repeated action of tides and waves in the shallow water environment for a long time is conducive to the winnowing, enrichment and reconstruction of phosphorous rich particles, thus forming a phosphorous rock deposit with rich and thick beds in the northwest and poor and thin beds in the southeast of the mining area. To sum up, the ore forming process of the Yangchang phosphate deposit can be divided into three stages, namely: (1) initial accumulation and precipitation mineralization stage (phosphorus source carried by upwelling ocean current); (2) biochemical deposition and accretion mineralization stage (migration and enrichment driven by microbial decomposition, transformation and compound); (3) winnowing enrichment and re-enrichment mineralization stage (precipitation and enrichment driven by multi-stage wave and tidal action). This new points provides an important basis for prospecting and exploration in the mining area and peripheral areas. [ABSTRACT FROM AUTHOR]

Phosphate ore is an important strategic mineral resource, and its guarantee degree is related to national resources, energy and food security. Phosphate ore resources in Yunnan Province occupy an important position in the country, with the characteristics of concentrated distribution, simple deposit types, large and medium-sized deposit are abundant, good ore quality and easy mining. With the major breakthrough in mineral prospecting of the Yangchang phosphate deposit in Zhenxiong area in recent years, phosphate ore in Yunnan Province has become one of the hot spots in mineral deposit research. This paper systematically sorted out the types and resource reserves of phosphate ore deposits in Yunnan Province, selected typical deposits of different deposit types for detailed dissections, systematically summarized the metallogenic laws from the aspects of spatial and temporal distribution characteristics, ore-bearing rock series characteristics, etc., improved the sedimentary phosphate ore mineralization model in Yunnan Province on the basis of the Yangchang phosphate deposit research, and combined with the results of potential evaluation, delineated 8 key prospecting potential areas. It provides the direction for phosphate rock prospecting in Yunnan Province in the future. [ABSTRACT FROM AUTHOR]

The Cambrian life explosion is closely related to the redox environment of plaeoocean, and the Lower Cambrian phosphorite in the Upper Yangtze Block has recorded a relatively complete information of the Early Cambrian. The Yangchang phosphate deposit in western margin of the Yangtze Block is a super-large phosphate deposit occurring in the Meishucun Formation of the Lower Cambrian, which can reconstruct the paleomarine environment of this period. In this paper, ICP-MS and other techniques were used to analyze the elemental geochemical composition characteristics of the phosphorite and its surrounding rocks and explore the geological environment of the Yangchang phosphate deposit. The results show that the CIA value of phosphorite is 46.40~65.60, with an average of 57.43, indicating that the weathering degree is low, the total amount of rare earth element (∑REE) in phosphorites in this deposit is relatively low (140.0x10-6 ??? 237.4x10-6, but yttrium is relatively rich (87.0x10-6 ~ 183.2x10-6). The North American standardized rare earth distribution pattern is relatively flat, the LREE/HREE is of 4.22 ~ 7.50, shows that the diffrernce of light and heavy rare earth elements is not obvious, with obvious Ce negative anomaly (0.22 ~ 0.42), Eu anomaly is not obvious with δEu of 0.90 ~ 1.21, and U/ Th ratio of 2.55 ~ 27.68, which reflect that the phosphorite was affected by a certain influx of hydrothermal fluid during the sedimentary of phosphorites. Combined with the analysis of δCe, V/Cr, Y/Ho, Sr/Cu and other elements, it is indicate that from the bottom of Dengying Formation in the Sinian Period, to the phosphate-bearing layer Cambrian Meishucun Formation, to the upper cover Niutitang Formation, the ancient ocean redox environment changes from the relative reduction environment at the bottom to the oxidation environment upward until the top becomes the relative reduction environment. The paleoclimatic environment is cold and dry-warm and moist alternatively appear. The salinity of ancient seawater is the evolution process of salt water to semi-salt water to salt water to fresh water. The above analysis shows that the phosphorite deposit in a relatively oxidized saline water and arid climatic environment, and the climatic environment is relatively arid during sedimentation, and may be affected by the influx of hydrothermal fluid. [ABSTRACT FROM AUTHOR]

To examine how different harvesting periods affect the storage quality of 'Satsuma' plum fruits, this study analyzed 13 quality and physiological metrics post-harvest and utilized principal component analysis (PCA) and mathematical models to assess (0±0.5)°c low temperature storage quality across three different harvesting periods (100 d after flowering, 103 d after flowering, 106 d after flowering). The results showed that harvesting at 103 days after full bloom led to the best preservation effect. Additionally, the hardness and total acidity of plum fruit decreased by 37.37% and 27.06% respectively until the end of the storage period, which was the slowest. Furthermore, changes in relative conductivity, anthocyanins, total soluble solids, malondialdehyde, total phenols, and flavonoids were relatively smooth. The activity of polyphenol oxidase was low, while peroxidase, superoxide dismutase, and catalase activities were high, specifically catalase activities. After conducting PCA analysis, it was determined that PC1, PC2, and PC3 accurately capture 87.472% of the relevant information. These results suggested that varying harvesting periods would have significant impacts on all indicators. The mathematical model analysis revealed that the plum fruits harvested at 100, 103, and 106 days after bloom, and stored for 56 days, had comprehensive scores of 1.06, 0.99, and 2.69, respectively. Lower comprehensive scores indicated better quality, so the order of preservation effect was as follows: 103 days after bloom>100 days after bloom>106 days after bloom. The study provides a theoretical framework for evaluating postharvest preservation and quality of plum fruits, along with technical parameters to enable timely harvesting. [ABSTRACT FROM AUTHOR]

To address the issue of false and missed detection of non-motorized vehicles due to the small size and obstructed vision in autonomous vehicle target detection, this research refines YOLOv4 basic algorithm to bolster the accuracy of non-motorized vehicle detection. The optimized algorithm streamlines the feature extraction process through a cross-stage connection, concurrently diminishing computational overhead and bolstering detection efficiency. Additionally, Convolutional Block Attention Module (CBAM) is embedded to increase effective feature weights and improve detection accuracy through channel and spatial attention weights. A non-motorized vehicle detection model is established based on anchor adaptive matching using a self-built non-motorized vehicle dataset. To verify the effectiveness of the model, the performance of the model is compared through ablation experiments. The results show that the proposed detection model substantially improves the detection and recognition performance of non-motor vehicles, effectively solve the problems of missed and false detections. [ABSTRACT FROM AUTHOR]

A novel and comprehensive resource utilization technology involving the production of biomass fuel rods and the creation of water-retaining and loose media derived from food waste has been developed as a result of the increased focus on the efficient utilization of resources derived from food waste in recent years. This technical procedure produced a novel wastewater stream that was identified as food waste squeezing liquid. The study was primarily concerned with examining the effects of temperature on the anaerobic fermentation method used to produce methane from food waste squeezing liquid and with examining changes in the microbial population during the fermentation process. After 53 days of anaerobic fermentation at the ideal temperature 47 °C, 17 220 mL of gas were produced overall, with peak methane production accounting for 70%~75% of the total gas output. This peak methane production was 2.5 times higher than that observed at 37 °C. It's interesting to note that after the fifth day of fermentation, no methane generation was seen at temperatures of 27 °C, 57 °C, and 67 °C. After performing high-throughput sequencing on the 16S rDNA, the relative abundance of unclassified_d_Bacteria decreased significantly from 83.92% to only 24.16% during fermentation under low oxygen conditions. Under strict anaerobic conditions, the proportion of Clostridium increased dramatically from a mere percentage of just 0.93% to as high as 44.75%, but it eventually dropped down to 5.40% after concluding the fermentation experiment. Subsequently, the relative abundance of unclassified_d_Bacteria rebounded and rose sharply from 24.16% to 68.12%. The findings of this study offer valuable insights into the optimization of anaerobic fermentation temperature selection and the choice of bacterial strains applicable in the practical engineering implementation of food waste squeezing liquid. [ABSTRACT FROM AUTHOR]

Objective To investigate the risk factors for the failure of ibuprofcn treatment in preterm infants with hemodynamically significant patent ductus arteriosus (hsPDA). Methods A retrospective collection of clinical data was conducted on preterm infants with a gestational age of <34 weeks who were diagnosed with hsPDA and treated at the Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, from January 2018 to June 2023. The subjects were divided into two groups based on the treatment approach: the ibuprofen group (95 cases) and the ibuprofen plus surgery group (44 cases). The risk factors for the failure of ibuprofen treatment in preterm infants with hsPDA were identified by binary logistic regression analysis. Results The binary logistic regression analysis revealed that an increased diameter of the ductus arteriosus, a resistance index (RI) value of the middle cerebral artery ≥0.80, and prolonged total invasive mechanical ventilation time were risk factors for the failure of ibuprofen treatment in preterm infants with hsPDA (P<0.05). Receiver operating characteristic curve analysis showed that a ductus arteriosus diameter >2.85 mm, a middle cerebral artery RI value 50.80, and a total invasive mechanical ventilation time >16 days had significant predictive value for the failure of ibuprofen treatment in preterm infants with hsPDA (P<0.05). The combined predictive value of these three factors was the highest, with an area under the curve of 0.843, a sensitivity of 86.5%, and a specificity of 75.0% (P<0.05). Conclusions A ductus arteriosus diameter >2.85 mm, a middle cerebral artery RI value 50.80, and a total invasive mechanical ventilation time >16 days are risk factors for the failure of ibuprofen treatment in preterm infants with hsPDA, and they are of significant predictive value for the necessity of surgical treatment following the failure of ibuprofen treatment. [ABSTRACT FROM AUTHOR]

As a common antibiotic, tetracycline (TC) is extensively used in the prevention and treatment bacterial dis¬eases in animals and is also used as a feed additive to promote the growth of animals. In this paper, a fluorescence quenching method based on nitrogen doped carbon quantum dots (N-CQDs) derived from pineapple peel was established for the rapid detection of TC. The blue fluorescent N-CQDs with high quantum yield were prepared by the hydrothermal method using pineapple peel and diethylenetriamine as precursors. The structure of N-CQDs was characterized by trans¬mission electron microscope, fourier infrared spectroscopy and X-ray photoelectron spectroscopy. The results showed that the average particle size of N-CQDs was about 3.53 nm, which was mainly composed of C, N and 0, and the surface has oxygen-containing and nitrogen-containing groups. The fluorescence of N-CQDs was effectively quenched by static quenching and internal filtering effect. Under the optimal experimental conditions, the method had good linearity within 0.3-40 g/mL, and the detection limit was calculated to be 89.26 g/L. Moreover, the detection method has been applied to the determination of TC in pork, the recovery rate was 98.40%-106.02%. The results showed that the detection method could be applied to the rapid determination of TC in pork. [ABSTRACT FROM AUTHOR]

In order to reveal the changing trend of the microbial communities in chilled chicken during a partially frozen storage, and to provide a theoretical basis for partially frozen preservation, 16S RNA high-throughput sequencing technology was used to analyze the changes of microbial community structure of the chilled chicken during a partially frozen storage at -3 . The results showed that Shannon index °C decreased, Simpson index increased, and microbial diversity decreased; The Ace index and Chao1 index first decreased, then increased with the storage time, and reached the peak value at the 4th day of storage then gradually decreased. At the phylum level, the dominant microorganisms of the chilled chicken during the storage were Proteobacteria, Firmicutes, Bacteroidetes, Actinobacteriota and Chloroflexi. The relative abundance of Proteobacteria increased with the extension of storage time, whilst the other Phyla decreased. At the genus level, the dominant taxa of chilled chickens were Pseudomonas, Acinetobacter, Shewanella and Psychrobactera. With the extension of storage time, the relative abundance of Pseudomonas increased, and the relative abundance of Acinetobacter, Shewanella or Psychrophilic decreased. At the 28 th day of the storage, Pseudomonas was the most abundant, with The relative abundance of other bacteria accounting for less than 1%, respectively. Accordingly, Pseudomonas is the dominant spoilage bacteria of chilled chickens during the partially frozen storage. [ABSTRACT FROM AUTHOR]

In order to investigate the characteristics of deformation and water loss of hardened paste of water-rich filling material under aging effect,the creep property of water-rich filling materials with a certain mass ratio of water to solid was studied in different stress conditions. The deformation characteristics,water loss and its relationship with external load on the filling body in the process of creep were analyzed by using scanning electron microscopy and differential thermal analysis-thermal gravimetry(DTA-TG). It is found that the instability and failure critical stress of water-rich filling materials with a 2.0 water-to-solid mass ratio is 1.96 MPa,which is 90% of their compressive strength. Creep cannot affect the content of combined water in water-rich filling materials. But unbound water in water-rich filling materials can run off when instability and failure happen. The relative loss value of unbound water content is of linear positive correlation with the external load level. The loss of unbound water can induce more interspaces in waterrich filling materials. These cracks are quickly pressed and the hardening body produces large deformation under the external load,which leads to the local instability of the filling body and thus affects the overall stability of the goaf.

As for the problem that different gypsum types have different influence on the condensation performance of water-rich filling materials,micro experiments,such as X-ray diffraction,scanning electron microscopy and infrared spectroscopy,were used to analyze the composition of the hardened body and investigate the influence of dihydrate gypsum and hemihydrate gypsum on the setting and hardening characteristics of water-rich filling materials. It is found that in a water-rich filling material system of sulphoaluminate cement-gypsum-lime,the gypsum type should be dihydrate gypsum so as to ensure the normal condensation setting and hardening; if hemihydrate gypsum is used as a raw material,the water-rich filling material has not strength after hydrating for 7 d. When dihydrate gypsum is adequate,the generated ettringite crystals are fine needle-like; but when dihydrate gypsum is inadequate,the generated ettringite crystals are short hexagonal columnar. The strength of the water-rich filling material is mainly derived from ettringite generated by the reaction of sulphoaluminate cement gypsum and lime,rather than the hydration products of cement generated by itself such as hydration calcium sulphoaluminate,alumina gel and calcium hydroxide.

The Xucun uranium deposit is located in the Luzong ore concentration area of the Middle and lower reaches of the Yangtze River metallogenic belt. It belongs to a middle-low temperature hydrothermal type uranium deposit which is related to Huangmeijian A-type granite in late Yanshanian period. The main ore types are feldspathic sandstone-type uranium ores and a few are quartz syenite type uranium ores. Based on the detailed field exploration and research work in recent years, this paper summarizes the metallogenic geological background and geological characteristics of the uranium deposits, discusses the mechanism of uranium mineralization. It is considered that the morphology and structural development of the rock-stratum contact interface are the decisive factors to control the spatial distribution of uranium ore body. The inner and outer contact zones of rock mass are the most favorable ore-bearing sites. Uranium mineralization is closely related to the intrusion of magmatic rocks in the late Early Cretaceous. In addition, the metallogenic mechanism of the deposit is further discussed and the metallogenic model of Xucun uranium deposit is established. That has important reference for enriching the theory of hydrothermal uranium mineralization related to A-type granite. At the same time, it also provides the basis for further exploring the uranium mineralization, metallogenic types and ore-prospecting potential of the NE-trending A-type granite belt in Huangmeijian area and even in Luzhou Basin. [ABSTRACT FROM AUTHOR]

The Huangmeijian araa of Anhui Province, located in the southeastern margin of Lujiang-Zongyang volcanic basin, has superior geological conditions for uranium mineralization. The metallogenic type is epithermal uranium deposit related to alkaline rocks, and the uranium mineralization is controlled by strata, faults, magmatic rocks and postmagmatic hydrothermal activities. To study the relation between uranium mineralization and geophysical characteristics in this area, the geophysical characteristics of typical uranium deposits/occurrences are studied by comprehensive geophysical prospecting methods such as ground γ-ray spectrometric survey, gamma total measurement and induced polarization (IP). The results show that the uranium deposits/occurrences are generally located in the gamma high field and energy spectrum uranium anomaly field to high field gradient zone, with the electrical characteristics of low resistance and high polarization for ore-bearing structure faults. By summarizing the geological-geophysical characteristics of uranium deposits (occurrences) of this type, two metallogenic prospect areas are delineated, which provides basis for further work and reference for prospecting the same type of uranium deposits. [ABSTRACT FROM AUTHOR]

Yeast surface display is widely used in antibody discovery and optimization. However, traditional yeast display system could only display the antibody on the cell surface without the secretion of antibody to the cell culture supernatant for direct affinity measurement. To solve this problem, we generated the dual functional yeast display/ secretion system that displayed antibody crystallizable fragments (Fc) with Knob modified as "bait" to capture half molecular immunoglobulin (IgG) with Hole mutation, and secreted fully IgG assembled by Hole-Hole homodimer to the culture supernatant. Results showed that the heavy chain constant region 3 of immunoglobulin with Knob mutation was the best "bait" for antibody display. The dual functional yeast display/secretion system could not only efficiently identify the strains displayed high affinity antibodies from spiking library but also secrete the antibodies to the supernatant for direct affinity measurement. This study proves that the dual functional yeast display/ secretion system was successfully used for antibody affinity maturation, resulting in marked acceleration of the process. : [ABSTRACT FROM AUTHOR]

BACKGROUND: Insufficient alveolar bone volume in the dental implant area increases the difficulty of implant surgery, and the emergence of bone graft materials has successfully solved such problems. Among all single bone graft materials, xenogeneic calcined bone is widely used for the treatment of bone defects. However, there are still some disadvantages when using calcined bone alone. OBJECTIVE: To review the research progress in the repair of bone defects by heterogeneous calcined bone materials based on the latest relevant research trends. METHODS: The first author searched PubMed, VIP, WanFang and CNKI databases for relevant articles published from January 1986 to November 2019. The search terms were "calcined bone, xenogeneic bone, bone augmentation, bone substitute" in English and Chinese, respectively. Finally, 69 eligible articles were included for result analysis. RESULTS AND CONCLUSION: In all bone graft materials, calcined xenogeneic bone has good interconnectivity due to its similar characteristics to human bone structure. It facilitates the entry of vascular factors and osteogenic cells, provides channels and scaffolding for new bone formation, and has good biocompatibllity and certain degradation, so it is preferred by surgeons. However, there are still some shortcomings, such as low solubility, slow absorption and poor mechanical property, which prompt researchers to develop a composite of calcined bone with ceramics, polymer, osteoinductive factor and metal ion. This can utilize the advantages of the involved materials, and thus the composite becomes a first choice of bone increment. [ABSTRACT FROM AUTHOR]

In view of the remote monitoring demand of tea processing and the lack of tea processing traceability, a remote IoT (Internet of things) monitoring platform for state parameters during tea processing was proposed. It achieved the remote monitoring of both processing line and tea state. A traceability evaluation model of tea processing was established by using B/S framework to show real-time information, combined data of both fresh leaf states and tracing information of processing, and analytic hierarchy process to analyze the effects of production parameters on tea quality. On this basis, the quality evaluation model of tea production offline and online database fusion was constructed to improve the quality of data storage. Finally, the remote monitoring system development and traceability information collection verification test were carried out for the Huangshan Maofeng preliminary processing production line. The results show that the platform is stable, the data display is accurate and complete, and the real-time performance is good, which provides technical support for tea quality optimization and big data analysis. [ABSTRACT FROM AUTHOR]

To increase the airborne photoelectric reconnaissance devices' field of view, most aerial cameras adopt the method of scanning to photograph the earth. For the purpose of image distortion caused by the oblique photography of array CCD aerial camera, a practical auto-rectification approach was proposed in the thesis. As there was a dual-axis rotation (specifically, the azimuth and pitch motion) between these array CCD aerial cameras and aircrafts, this paper introduced a new approach for image geometric correction that took into account both the rotational angles from cameras to aircrafts and the attitude angles of the aircrafts relative to the ground. First, the six attitude angles projective rectification model of these array CCD aerial cameras was established. Then, the relationship of pixel coordinates between distortion image and standard image was obtained. Through coordinate transformation and luminance bilinear interpolation, the aerial remote sensing image with distortion was auto-accurately rectificated. Finally, the aerial image of an airport was corrected using the six attitude angles projective rectification model, the ground control point based multinomial correction model and the correction method of matching the distortion image and reference image, respectively. Experiments show that the six attitude angles projective rectification model can achieve pixel level correction preci sion. For 51 2 pixel x 512 pixel images, the root mean square error of image correction can reach 1.174 7 pixel accuracy when the accuracy of attitude angles is 3 min. The proposed algorithm in the thesis doesn't need for reference images and ground control points, and facilitates engineering application. It can satisfy the system requirements of online, real time, higher precision and stabilization. [ABSTRACT FROM AUTHOR]

The article presents a study which examines the effects of buzhong yiqi pills on the mucin 1 (MUC1), cythochrome C oxidase (COX), and nitric oxide synthase (NOS) expression and interaction in gastric tissue of diabetic rats. It says that the diabetic rat gastric mucosa damage model was intraperitoneally injected with streptozotocin (STZ) and orally administered to ethanol. The results of study is discussed.

When the remote sensing pan image of high spatial resolution and multi spectrum image are fused, the multi-spectrum image is resampled with bilinear interpolation to be of the same spatial resolution as the pan image. Based on it, the two remote sensing images were transformed by wavelet. And their wavelet decomposition coefficients fusion formula was put forward. In order to verify the fusion way, it was compared with the nearest neighbor resampling wavelet transform, IHS (Intensity, Hue and Saturation) transform and Brovery transform fusion. The simulation shows that the proposed fusion method is of good performance of preserving the spectral and spatial resolutions for pan and multi-spectrum image, with the lowest loss of spectral information. [ABSTRACT FROM AUTHOR]

To improve the synthetic performance of converters based on the present power electronics, this paper revealed that combining a power electronics switch circuit with a linear circuit can create a Switch-Linearity Hybrid Power Converter (SLH), whose operation scheme was briefly described. Two kinds of topologies of parallel connection and serial connection were listed as well as their features. The effect of SLH' low output resistance feature on the static and dynamic performances was explained. Comparing the SLH to a typical PWM converter plus LC filter unit, it presented the test data and the typical waveforms from the supply system and drive system in different load conditions. The results show SLH has good synthetic performances such as both high efficiency and optimal waveforms, adaptability to multi-kinds of loads and resistivity against load disturbances. [ABSTRACT FROM AUTHOR]