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[Objective] Liquid hydrogen has garnered significant interest for its high volumetric density and hydrogen purity. However, it easily evaporates during transportation due to its low boiling point, thus causing hydrogen loss. In this case, cryogenic insulation technology becomes essential for facilitating liquid hydrogen pipeline transportation. [Methods] The analysis of heat leakage in the pipeline's annulus considered three modes of heat transfer: solid heat conduction, gas heat conduction, and radiant heat exchange. Since the solid heat conduction primarily arises from the thermal insulation support structure within the annulus, an overview was provided on the heatconducting properties of various support structures. In addition, maintaining the vacuum level of annulus interlayer can effectively weaken the heat leakage caused by gas heat conduction. The impact of vacuum multilayer insulation on cryogenic insulation is a current focus of research. The prediction model and arrangement mode of vacuum multilayer insulation, as well as uniform density multilayer insulation(UD-MLI) and variable density multilayer insulation(VD-MLI) were examined and analyzed in this study. [Results] By optimizing support shape and minimizing heat transfer paths while reducing contact points and areas between the support and inner/outer pipe, heat leakage can be effectively decreased while ensuring stress intensity. Further study on cost-effective and high-efficiency getters is the most direct and effective approach to maintaining vacuum levels. Vacuum multilayer insulation technology has been extensively utilized in cryogenic equipment to significantly diminish solid and gas heat conduction as well as radiant heat exchange. Both UD-MLI and VD-MLI feature the optimal layer density configuration to minimize heat leakage, with VD-MLI offering superior insulation performance and a weight advantage. [Conclusion] Optimizing annulus geometry and heat transfer modes, along with developing high-efficiency hydrogen getters, are vital for advancing annulus insulation technology in cryogenic liquid hydrogen transportation pipelines and minimizing hydrogen loss during transportation.

Citri Reticulatae Pericarpium (CRP) has both culinary and medicinal uses, with high medicinal and economic value. However, CRP fraud such as mislabeling of the geographical origin, passing off, and aging time cheating has occurred frequently, which damages consumer interests. In order to ensure the safety and quality of CRP, it is urgent to establish effective techniques for its geographical origin traceability and authentication. In this article, we review recent progress on the application of metabolomics, spectroscopy, DNA analysis, elemental analysis and intelligent sensory analysis in identifying the geographical origin, variety, harvest period and aging time of CRP. Meanwhile, we compare and analyze the advantages and disadvantages of each technique, and propose the existing problems and future research priorities in the field of geographical origin traceability and authentication of CRP.

Objective To evaluate clinical efficacy of artificial perfusion combined with interception basket in ureteral calculi lithotripsy. Methods Clinical data of 151 patients with ureteral calculi who underwent surgical treatment were retrospectively analyzed. They were divided into the observation group（artificial perfusion combined with interception basket）and control group（conventional perfusion pump）. The operation time，intraoperative blood loss，proportion of stone escape，stone re-intervention and complications were observed in two groups. Results There were no significant differences in operation time，intraoperative blood loss and incidence of complications between two groups（all P > 0.05）. The proportion of stone escape and stone re-intervention in the observation group were significantly lower than those in the control group，and the differences were statistically significant（both P < 0.05）. Conclusion Artificial low-pressure perfusion combined with interception basket in ureteral stone lithotripsy can reduce the proportion of stone escape and residual stone re-intervention and improve the stone clearance efficiency.

In the context of new power systems， the diverse distributed power sources and user-side behavior have introduced instability in bus loads， thus presenting a fresh challenge for short-term load forecasting. In response to this challenge， a noise reduction forecasting method for bus load based on sequence decomposition is proposed. The construction and decomposition rules of the variational mode decomposition （VMD） are applied to the sequence decomposition of bus load. The residual terms following the sequence decomposition are smoothed using locally weighted regression （LWR） to forecast the noise reduction of bus load. Based on the measured active power data of bus load in an area， a recurrent neural network （RNN） is constructed to forecast the bus load after noise reduction. The results indicate that this method effectively eliminates the noise of the bus load sequence， and the sequence tends to be smooth while retaining the characteristics of the original bus load sequence. Moreover， it yields excellent forecasting curves and accurate forecasting results.

Objective·To analyze the clinical characteristics and prognostic risk factors of patients with diffuse large B-cell lymphoma (DLBCL), and evaluate the prognostic effects of autologous stem cell transplantation (ASCT) and rituximab maintenance therapy on DLBCL patients.Methods·The clinical data of 160 patients with DLBCL who were first diagnosed by pathology and immunotyping were collected from the Department of Hematology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine from January 2015 to January 2020, and the risk factors affecting the efficacy and prognosis of patients were analyzed. Moreover, the clinical characteristics of patients with relapsed/refractory DLBCL and the effect of salvage ASCT on overall survival (OS) were assessed. For those high-risk patients who achieved complete remission (CR) in the interim assessment, the impact of ASCT and rituximab maintenance therapy on survival outcomes was further assessed.Results·Patients with initial age of treatment >60 years (P=0.005), International Prognostic Index (IPI) 3‒5 scores (P=0.032), low albumin level (P=0.001) and anemia (P=0.007) had poor efficacy. Multivariate analysis showed that the initial age of treatment >60 years (HR=2.788, 95%CI 1.575‒4.936, P=0.000), non-GCB subtype (HR=2.230, 95%CI 1.150‒4.324, P=0.018), elevated lactate dehydrogenase level (HR=2.064, 95%CI 1.006‒4.234, P=0.048) and low albumin level (HR=2.052, 95% CI 1.169‒3.602, P=0.012) were the independent risk factors for progression-free survival (PFS). The initial age of treatment >60 years (HR=2.269, 95% CI 1.060‒4.860, P=0.035) and IPI scores of 3 to 5 (HR=2.557, 95%CI 1.132‒5.778, P=0.024) were independent factors affecting OS. For patients with relapsed/refractory DLBCL, salvage ASCT was found to significantly improve the prognosis of these patients and was a protective factor for the death event of patients (P=0.030). For patients in the high-risk group who achieved CR in the interim evaluation after chemotherapy, there were no deaths in patients on maintenance therapy with consolidation ASCT and rituximab to the end point of follow-up; however, it did not prolong the OS of the patients (P>0.05).Conclusion·In patients with relapsed/refractory DLBCL, salvage ASCT can significantly prolong the OS, whereas in the high-risk patients of DLBCL, consolidation ASCT and rituximab maintenance therapy can't prolong the OS.

The connection between B10 seawater pipeline and FeMnSi memory alloy pipe joint is prone to galvanic corrosion.In order to clarify the galvanic corrosion mechanism of FeMnSi/B10， the corrosion behavior， corrosion morphology， and corrosion product components of FeMnSi/B10 couple pair in 3.5% (mass fraction) NaCl solution at different temperatures were analyzed by electrochemical test， corrosion weight loss method， SEM， and EDS.Results showed that when galvanic corrosion occurred in FeMnSi/B10， FeMnSi was the cathode and B10 was the anode.The corrosion thermodynamic trends and corrosion rates of FeMnSi and B10 both increased with the increase of temperature.Moreover， the galvanic current density of FeMnSi/B10 couple pair dropped sharply at the beginning， slowed down with time， and finally reached a stable value.When the temperature increased from 25 ℃to 45 ℃， the galvanic current density of the couple pair increased by about 1 time，indicating that the corrosion resistance of the FeMnSi/B10 couple pair was more sensitive to temperature.With the increase of temperature， the corrosion form of B10 developed from intergranular corrosion to exfoliation corrosion.Besides， the corrosion products of FeMnSi memory alloy were Fe2O3， Fe3O4， FeOOH， and the corrosion products of B10 copper-nickel alloy were Cu2O， Cu2Cl(OH)3.

ObjectiveAnalysis of the epidemiological and spatio-temporal clustering of aconite poisoning incidents in China from 2010 to 2020 was performed to provide a reference for the development of precise prevention and control measures and the construction of an early warning system.MethodsCollection of reports of aconite poisoning incidents in surveillance data from 2010 to 2020 with descriptive analysis and spatio-temporal scan analysis was performed.ResultsFrom 2010 to 2020， a total of 380 outbreaks of aconite poisoning with 1 889 illnesses and 75 deaths were reported in China， with a case fatality rate of 3.97% （75/1 889）. The highest number of outbreaks occurred from October to December with 787 cumulative illnesses， accounting for 41.66% （787/1 889） of all cases. More than 86.84% （330/380） of the outbreaks occurred in Yunnan Province and households accounted for 90.26% （343/380） of all outbreak locations. Improper processing resulting in 171 outbreaks， accounting for 45.00% （171/380）. The results of the spatio-temporal scan showed a total of five agglomerative regions， including a category one agglomeration centered in Kunming， Yunnan Province， with an agglomeration period from June 2015 to November 2020， as well as four second-class aggregation areas， including 20 municipalities.ConclusionWe should focus on prevention and control in areas with clusters of aconite poisoning， and publicize and popularize high-risk consumption methods to raise awareness on protection and reduce the occurrence of poisoning incidents before the arrival of the high months.

This work was undertaken in order to study the microbial diversity in dairy products from ethnic minority habitats in Xilin Gol. Six fresh cow milk samples from Sunit Left Banner and East Ujimqin Banner (n = 3 for each region) were selected for metagenomic sequencing, and lactic acid bacteria (LAB) from these samples were isolated and identified by the traditional culture method. There results showed that a total of 165 microbial species were identified in the six milk samples, the dominant ones being Lactococcus lactis and Leuconostoc mesenteroides. Many microbial species were common to the two groups, and there was no significant difference in α- or β-diversity, but there were still significantly differential species identified between these groups. Fresh milk from Sunit Left Banner was dominated by Lactococcu phage BM13, while that from East Ujimqin Banner was dominated by Enterobacter sp. MGH8. A total of 1 408 048 genes and 412 metabolic pathways were annotated using the Uniprot database, whose functions were concentrated on amino acid metabolism and glycolic acid metabolism. A total of 47 strains were isolated from the six fresh milk samples, and L. lactis was the dominant strain, which was consistent with the metagenomic results. This study is expected to provide a theoretical basis for the safe production of fermented dairy products and the development of starter cultures.

Turbine blades are the most demanding components in aircraft engines, and their performance is related to the safety of the whole engine. Due to the complex service environment and harsh service conditions of blades, various types of damage cannot be prevented in service. Therefore, it is of great engineering and economic significance to study the service damage of blades. In this paper, the directional solidification alloy turbine blade after actual service was selected as the research object. The cross section position of 80% upper height of the blade was intercepted, and the qualitative and quantitative microstructure analysis was carried out by SEM and EDS analysis. The results show that there are two different types of γ' phases in this leaf. One kind of γ' phase has small size and regular shape, the other has large size and irregular shape. The degree of microscopic damage among different parts of the blade is characterized with the help of dimensional distribution characterization of the γ' phase of each part, combined with the analysis of hardness testing of each part of the cross-section.The results show that the service conditions of different parts are different, and the degree of microstructure damage is different. In addition, matrix crack and coating crack in some parts of blade are summarized and analyzed.

Objective To investigate the application effect of enhanced recovery after surgery in perioperative nursing of patients with choledochojejunostomy. Methods Totally 80 patients undergoing choledochojejunostomy were randomly divided into the control group and observation group, with 40 cases in each group. Patients in the control group received routing care during the treatement, and those in the observation group received perioperative nursing interventions based on the theory of enhanced recovery after surgery. Primary outcomes were first anal exhaust time, length of hospital stay, hospitalization costs and incidence of postoperative complications. Secondary outcomes were time to remove the gastric tube, time to remove the urinary catheter, time to food-taking, time to off-bed activity and volume of fluid infusion. Results The first anal exhaust time and length of hospital stay in the observation group were shorter than those in the control group (P＜0. 01). The hospitalization costs in the observation group was lower than that in the control group (P＜0. 01). The time to remove the gastric tube, time to remove the urinary catheter and time to off-bed activity in the observation group were shorter than those in the control group (P＜0. 01). The volume of fluid infusion in the observation group was less than that in the control group (P＜0. 01). The incidence rate of complications in the observation group was lower than that in the control group (P＜0. 05). Conclusion The enhanced recovery after surgery is effective and safe in perioperative nursing of patients with choledochojejunostomy, it has a positive effect on reducing the incidence of postoperative complications. (目的 探讨基于加速康复外科理念的护理干预在胆肠吻合术患者中的应用方法及效果。方法 选择2018年1月—2020年8月住院行胆肠吻合术的80例患者为研究对象, 按照随机分组方法将患者分为对照组和观察组, 各40例。对照组给予常规护理, 观察组实施基于加速康复外科理念的护理干预。主要指标: 首次肛门排气时间、住院时间、住院费用、并发症的发生率; 次要指标: 拔除胃管时间、尿管时间、进食时间、下床时间、输液量。结果 观察组首次肛门排气时间、住院时间均较对照组缩短, 差异有统计学意义(P＜0. 01), 观察组住院费用较对照组减少, 差异有统计学意义(P＜0. 01)。观察组拔除胃管时间、拔尿管时间、进食时间以及下床时间较对照组缩短, 差异有统计学意义(P＜0. 01), 观察组输液量也明显少于对照组, 差异有统计学意义(P＜0. 01)。观察组并发症发生率低于对照组, 差异有统计学意义(P＜0. 05)。结论 在胆肠吻合术患者围术期护理中的应用加速康复外科理念安全有效, 对降低术后并发症发生率具有积极意义。)

为解决C22-三元羧酸合成过程中均相催化剂残留、原料价格较高等问题，以油酸为原料，在路易斯酸催化下与马来酸酐进行Alder-ene加成反应，水解后得到C22-三元羧酸。对C22-三元羧酸的合成条件进行优化并对产物进行了鉴定；制备C22-三元酸钠表面活性剂并研究其表面性能。结果表明：C22-三元羧酸合成的最佳条件为以FePO4为催化剂、催化剂用量3%（以油酸物质的量计）、马来酸酐与油酸物质的量比3∶ 1、反应温度180 ℃、反应时间10 h，在此条件下C22-三元羧酸产率达到78%，油酸转化率为77.4%；通过质谱及核磁共振表征证明得到了较纯的C22-三元羧酸；催化剂经过5次回收利用并未出现明显的活性降低；以C22-三元羧酸为原料制备的C22-三元酸钠表面活性剂的临界胶束浓度为3.61×10-3 mol/L，在临界胶束浓度下的表面张力为28.39 mN/m。综上，油酸在FePO4催化下直接马来酸化制备C22-三元羧酸，工艺绿色，原料成本较低，并可作为表面活性剂制备的良好原料。 To solve the problems of homogeneous catalyst residue and high raw material price in the synthesis of C22-tricarboxylic acid, using oleic acid as the raw material, Lewis acid as catalyst, the Alder-ene addition reaction of oleic acid and maleic anhydride was realized, and C22-tricarboxylic acid was obtained after hydrolysis. The synthesis conditions of C22-tricarboxylic acid were optimized and the product was identified, and its product was neutralized to prepare C22-tribasic acid sodium surfactant and its surface properties were studied. The results showed that the optimal conditions for C22-tricarboxylic acid synthesis were obtained as follows: with Lewis acid FePO4 as catalyst, dosage of catalyst 3% (calculated by the mole of oleic acid ), molar ratio of maleic anhydride to oleic acid 3∶ 1, reaction temperature 180 ℃, and reaction time 10 h. Under the optimal conditions, the yield of C22-tricarboxylic acid could reach 78% and oleic acid conversion rate was 77.4%. It was proved that C22-tricarboxylic acid was obtained through mass spectrometry and nuclear magnetic resonance characterization. There was no obvious decrease in activity of catalyst after 5 times of recycling. The critical micelle concentration of C22-tribasic acid sodium surfactant prepared by C22-tricarboxylic acid was 3.61×10-3 mol/L, and the surface tension(γ) reached 28.39 mN/m. In conclusion, the preparation process of C22-tricarboxylic acid by the Alder-ene addition reaction of oleic acid and maleic anhydride with FePO4 as catalyst is green and the cost of materials is low， and the C22-tricarboxylic acid prepared can used as good material for surfactant preparation.

During postharvest storage, spinach is prone to problems such as oxidation, dehydration, wilting and decay, causing severe losses. In view of this, postharvest spinach was treated with 1 μL/L 1-methylcyclopropene (1-MCP), 0.1% phytic acid (PA) or their combination to explore the effects of preservatives on the physiology and storage quality of spinach. Spinach not treated with preservatives was used as a control. All samples were stored at room temperature (20 ± 1) ℃ and a relative humidity between 80% and 90%. The decay index, mass loss percentage, chlorophyll content, soluble solid content, ethylene release, peroxidase (POD) activity and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capacity were measured. In addition, sensory evaluation was performed in terms of appearance, morphology and smell. The results showed that all three treatments were effective in maintaining spinach quality. Specifically, compared with the other three groups, combined treatment with 1-MCP and PA significantly enhanced peroxidase (POD) activity and DPPH radical-scavenging capacity, thereby delaying the increase in decay index, mass loss percentage and ethylene release and increasing the chlorophyll content of spinach and maintaining high soluble solid content and sensory evaluation score during storage. As a result, 1 μL/L 1-MCP + 0.1% PA composite treatment had the best preservation effect, which could effectively delay the postharvest senescence and quality deterioration of spinach.

Matrix multiplication is the core of many scientific calculations,and vectorized programming is one of the main means to improve its performance.In view of the existing vectorization optimization problems that often require manual tuning and need to be mapped to the hardware structure,based on the polyhedron compiler PPCG,a vector code generation framework is introduced into the polyhedron model,and a matrix multiplication vector code generation framework based on the polyhedron model is proposed.Through the profit analysis of the matrix multiplication vectorization program,the vectorization program is determined,and the code generation of the application framework is guided.Based on this framework,it is conducive to the rapid optimization of vectorization of matrix multiplication.Selecting 13 matrix multiplication cases with a scale between 64×64×64 and 1 024×1 024×1 024 for experiments.The results show that the framework can generate vectorized code correctly.Compared with the automatic vectorization of the basic compiler ICC,the vectorized code generated by the framework has a speedup of 5.09 times and an average speedup of 3.39 times.

ObjectiveTo investigate effect of conducting training of autism spectrum disorder （ASD） early screening skill on improving the ability to early identify ASD of medical staffs in primary care hospitals.MethodsIn September 2021， the training of ASD early screening skills was carried out for medical staffs from 20 primary care hospitals in Chengdu. After training， the training effect was evaluated. The numbers of referrals from primary care hospitals to superior hospitals， confirmed ASD as well as their average diagnostic age of children with ASD before and after training were used as evaluation indicators.ResultsAfter training， the number of children with suspected ASD referred by primary care hospitals was more than that before training ［（16.65±11.60） vs. （3.40±2.23）， t=5.431， P

This paper introduced the design and application of a disposable negative pressure device for collecting drainage fluid specimens. The purpose of this design is to modify the process of collecting drainage fluid specimens, reduce the workload of nurses and avoid the false positive results caused by multiple factors. (本文介绍一种一次性医用负压式引流液标本收集装置的设计与应用方法, 旨在减少留取引流液标本的环节, 节约护士操作时间, 避免留取过程中多环节导致假阳性。)

ObjectiveTo investigate the resistance dynamics of Blattella germanica to commonly used insecticides in Yangpu District of Shanghai during 2014‒2020， and to provide the basis for the rational use of insecticides against cockroaches.MethodsBlattella germanica was captured in two farmer’s markets in 2014， 2017 and 2020. The residual film method recommended by WHO was used to test resistance of Blattella germanica to the insecticides.ResultsIn 2014， 2017 and 2020， the resistance ratio of Blattella germanica in Yangpu District was 6.96， 4.39， 7.26 to beta-cypermethrin， 10.41， 6.71， 5.24 to permethrin， and 2.28， 3.16， 1.01 to propoxur.ConclusionThe resistance of Blattella germanica to permethrin and propoxur decreases， and the resistance to beta-cypermethrin keeps at low level. Comprehensive management and rotation of insecticides should be implemented to delay the increase of resistance.

Structural equation modeling (SEM) is a method of establishing, estimating and testing causality. It can replace multiple regression, path analysis, factor analysis, covariance analysis and other methods to clearly analyze the effect of individual indicators on the overall and the relationship between individual indicators. SEM is a multivariate statistical modeling technology mainly applied to confirmatory factor analysis model. Due to the advantages of measuring latent variable scores through observable variables and analyzing the synergistic effects between latent variables using different sub-models, SEM is widely used in data modeling and analysis in the fields of psychology, behavior, and marketing. It provides a mature application path of proposing the concept-designing the model-obtaining data-verifying the model. Geoscience data modeling technology has always been one of the hotspots in geoscience research, the purpose of which is to extract valuable model structures and latent variables from massive, multi-dimensional, high-dimensional, and multi-temporal geo-data, and to study different geo-variables and interactive relationship between latent variables so as to support related applications and research such as environmental governance, disaster prevention, resource prospecting, and ecological evaluation. With the changes in the scale of geoscience data and the continuous development of modeling tools, the geoscience data modeling have gradually changed from sampling to full-sample, the method from under the guidance of geological models to unconstrained/weak-constrained modeling, the basis from variable causality to variable correlation, and the complexity from single model/single process to comprehensive multi-model/multi-process. SEM is a comprehensive modeling method, which can include multiple analysis techniques such as factor analysis, latent variable estimation, path analysis, etc. This multi-level, multi-branch modeling method combines the characteristics of knowledge-driven modeling and data-driven modeling. SEM generally faces the following three challenges, also three changes, in the modeling of geoscience data: from a method mainly oriented to confirmatory modeling and analysis to an exploratory modeling and analysis method; from a construction with complete geological model constraints to a weak model/unconstrained geological data modeling method; from a modeling of statistical variables without spatial attributes to a modeling of spatial statistical variables. This puts forward new requirements on the model itself and the method of data modeling. In response to the above three issues, this article reviews the concept and development of SEM, and introduces three application cases of SEM in geological data modeling.One is using lake sediment geochemical data to extract mineralization endogenous factors in gold mines which is modeled under weak constraints.The second is using the comprehensive parameter optimization method of SEM to weaken and correct CI problem of weight of evidence in the calculation of the posterior probability of gold prospecting by matching the posterior probability and the observation posterior probability. The third is using SEM to study the forest protection strategy of the Magdalena watershed in Mexico.By numbering the forest blocks in different regions, the spatial distribution of the data is transformed into traditional statistical variables without spatial attributes, and the impact of different environmental strategies on forest protection is analyzed.

Objective: To examine the expression of progranulin(PGRN) in the lungs of mice with bleomycin-induced pulmonary fibrosis. Methods: A total of 36 C57BL/6 mice were selected and randomly divided into three groups. The bleomycin group underwent intratracheal administration of bleomycin (5 mg/kg) and the control group received the same volume of normal, saline. Both groups of mice were, sacrificed, in batches, on days 14 and 28 following intervention. Lung tissue was examined with hemotoxalin and eosin and Masson's trichome stains to demonstrate pulmonary inflammation and fibrosis in the mice. The distribution and expression of progranulin in lung tissue were examined using immunohistochemistry staining. Levels of PGRN protein expression in murine lung tissue were determined by Western blot. Results: Microscopic examination revealed that lung tissue in saline control mice was intact with minor inflammatory cell infiltration. However, lung tissue in bleomycin treated mice was damaged, with inflammatory cell infiltration and diffuse pulmonary fibrosis. Immunohistochemical staining showed a statistically significantly greater positive rate of PGRN in alveolar macrophages and in alveolar epithelial cells in the bleomycin group compared to the saline controls, and the pulmonary PGRN protein expression was significantly increased (P<0.05). Conclusion: PGRN may be involved in bleomycin-induced lung fibrosis in mice. [ABSTRACT FROM AUTHOR]

The underwater acoustic monitoring acquires a wide range of frequency bands, including multi-band feature information in the recording process, and doped with various kinds of noise. In order to extract the effective feature information of each frequency band of the monitored signal reliably, avoid the influence of noise, solve the drawbacks of energy method in judging the characteristic frequency band, and break the limitation of single method in extracting multi-band feature information of broadband signal，in this paper, using the advantages of wavelet packet, correlation coefficient and Hilbert-Huang，multi-band feature information of broadband signals is extraded. Firstly, the fine frequency division of broadband signal is realized by wavelet packet algorithm, and the validity of node signal is judged and the noise nodes are eliminated by correlation coefficient analysis. Secondly, the effective components and noise in the effective node band are further separated by Hilbert-Huang. Finally, the effective band characteristics are obtained by reconstructing the node coefficients after processing.The results of simulation and experimental signal processing show that this method has certain advantages in extracting characteristic frequency information of broadband underwater acoustic monitoring signals, and can be popularized and applied in underwater acoustic target recognition and monitoring.

In order to maximize the total spectrum efficiency and improve the Quality of Experience (QoE) on Elastic Optical Network (EON), an adaptive modulation method based on Deep Neural Network (DNN) is proposed. Firstly, the network transmission quality in optical fiber is estimated. Then, the route length, hop number and video quality are taken as the three parameters of the request characteristics, and the deep learning method is adopted to selected the modulation system with the maximum spectrum efficiency according to the desired QoE of each requirement. The simulation results show that the average spectral efficiency of the proposed method is 51%and 32%higher in National Science Foundation (NSF) network than that of distance adaptive method and integer programming method, and 43%and 29%higher in China Network (CN) backbone network. In addition, the blocking probability of the proposed method is 0.01 lower than that of the distance adaptive method and integer programming method.

In China, the total area of rocky desertification covers 1.01x107 hm², accounting for 22.3% of the karst area. Nowadays, rocky desertification has become one of the three major land degradation problems in our country, which has seriously affected our economic development and environmental governance. Naturally, rock weathering in the karst area is so long that it takes from a few decades to a hundred years to form a centimeter think of red soil. Because the karst area is rich in calcium and barren in soil, ecological restoration of this area is urgent in both rocky desertification control and karst carbon sink. Carbonic Anhydrase (CA), one of the fastest catalyzing enzymes, can promote the weathering of carbonate rocks by accelerating the hydration reaction of CO2, thus providing soil matrices for plant colonization. At the same time, CA can also be used to absorb CO2 in the atmosphere to fix the carbon source, thereby participating in the carbon cycle process of karst dynamic system. The CA-producing microorganisms are considered to have good application prospects in the restoration of degraded karst habitats. However, for the target strains isolated from favorable habitat, their weak adaptability to the extreme environment may constrain them from exerting their expected effects. In order to select the strain with high CA activity in the extremely degraded karst habitat, CA-producing strains were isolated from the samples of severely degraded rocky karst habitats in this study. The study area is located in Hechi City, Guangxi Zhuang (23°41'--25°37' N, 106°34'-109°09' E). It has a subtropical monsoon climate, with an average annual temperature of 16.9-21.5 °C. The area is typically developed with karst, scattered with thin soil and highly exposed with rocks. From September to October 2021, four different habitat samples were collected, including lichen in the area with extreme rocky desertification weathered materials under moss, soil under moss, and weathered materials under moss in karst native forest. The source of isolation was a mixture of the four different habitat samples, 1g of each. CA-producing strains were isolated and screened from karst rocky habitats by inoculating suspension of isolation source in calcium carbonate medium with a sprayer. The field emission scanning electron microscope was used for morphological identification of the strain. The physiological and biochemical characteristics of the strain were confirmed by carbohydrate decomposition test, V-P test, methyl red test, citrate utilization test, nitrate reduction test, starch hydrolysis test and contact enzyme test. Strains were identified by 16S rRNA sequence analysis. The CA activity of single strain and mixed strain was determined by electrode method. The sequence alignment was performed in the National Center for Biotechnology Information Database. In MEGA6, Neighbor-Joining method is used to construct the phylogenetic tree. SPSS software was used to analyze whether there were significant differences in CA activity among different strains/microflora. The results show that six CA-producing strains were isolated by calcium carbonate medium, namely, Flavobacterium resistens, Delftia acidovorans, Stenotrophomonas rhizophila, Pseudomonas oleovorans, Agrobacterium cavarae and Bacillus albus. The CA activity of Stenotrophomonas rhizophila was the highest, up to 4.27 U½mL-1½OD600-1, while that of Bacillus albus was only 0.46 U½mL-1½OD600-1, which indicated that although CA commonly existed in prokaryotes, the activity of different species of bacteria varied greatly. Mixed culturing of Stenotrophomonas rhizophila whose CA activity is high with other strains led to a decrease in CA activity, indicating the great potential application of Stenotrophomonas rhizophila in the extremely oligotrophic environment. The results provide a new bacterial source for ecological restoration of extremely degraded karst habitats. However, all the CA activity decreased when the isolated Stenotrophomonas rhizophila strain N6 with high CA activity is mixed with other 5 strains. Because of the complex living environment, the competition of indigenous microbial community will reduce the survival efficiency of the added microorganisms, make it difficult to form a stable community structure, and then reduce the repair effect. In restoration of degraded karst habitat, whether there is a kind of dominant bacteria that is symbiotic with Stenotrophomonas rhizophila N6 to jointly promote carbonate dissolution is a research focus. Therefore, future studies should identify the core species that drive the restoration of degraded habitats, and explore the relationship between the isolated and culturable CA dominant bacteria and the core species. These study focuses will promote the research and development of biological fertilizer for the rapid restoration of degraded karst habitats. [ABSTRACT FROM AUTHOR]

Streptococcus thermophilus is one of the most important starters in the dairy industry, with good fermentation characteristics. DNA methylation is a form of chemical modification of DNA that can affect gene expression without altering the DNA sequence. In this paper, two strains of Streptococcus thermophilus with large differences in acid-producing phenotype were selected as the research objects, and the relationship between m6A methylation and genetic phenotype was explored through methylome. The PacBio SMRT sequencing platform was used to sequence the genomes of Streptococcus thermophilus IMAU80278 and Streptococcus thermophilus IMAU20416 and measure the m6A methylation to compare the functional genes and m6A methylation differences between the two strains of Streptococcus thermophilus. The results showed that the genomes of Streptococcus thermophilus IMAU80278 and Streptococcus thermophilus IMAU20416 were similar, and the functional genes were mainly carbohydrate metabolism and amino acid metabolism. Streptococcus thermophilus IMAU80278 and Streptococcus thermophilus IMAU20416 showed significant differences in restriction modification systems, m6A methylation sites and m6A motifs, especially in the m6A methylation of genes related to carbohydrate metabolism and amino acid metabolism. It is speculated that the difference in m6A methylation may lead to the different acid-producing phenotypes between Streptococcus thermophilus IMAU80278 and Streptococcus thermophilus I-MAU20416. In addition, this study explored the effect of Streptococcus thermophilus DNA methylation on fermentation characteristics from the perspective of epigenetics, and laid a theoretical foundation for the selection and utilization of excellent starter. [ABSTRACT FROM AUTHOR]

Oral processing is not only a dietary process, but also a pleasure seeking process. The texture of food perceived by people is a multidimensional sensory characteristic. At present, rheology is no longer able to characterize this complex sensory perception. Tribology objectively characterizes the sensory properties of food in oral processing by simulating the processing process of food in the mouth and the lubrication behavior of food when pressed onto the surface of the mouth by the tongue. Oral tribology has become an important tool for characterizing the lubrication behavior in food oral processing. This article reviews the application of oral tribology in food processing and research and development, focusing on the sensory perception and lubrication mechanism of food in oral processing, such as astringency and lubrication, with the aim of providing reference for future food design. [ABSTRACT FROM AUTHOR]

Through the study on high temperature creep data of HP heat resistant alloy, a prediction method of high temperature creep deformation based on Zc parameter was proposed. The creep resistance of HP heat resistant alloy was predicted by this method. The results indicate that the predicted data are in good agreement with the HP heat resistant alloy creep experimental data at 1000,980℃ and 930℃. At the same time, the creep rupture life of heat resistant alloy was evaluated by this method, the results show that the predicted principal curves agree well with the experimental data.

In view of the problems such as low efficiency and surface cracks in optical glass processing,the experiment studied the influence of cutting parameters and acoustic parameters on milling forces and established a milling force model of optical glass ultrasonic vibration that based on the high frequency impact effect of ultrasonic vibration,through which on ultrasonic vibration milling of optical glass.The effects of factors such as milling speed,feed per tooth and milling depth on milling force were discussed through comparative experiments on ultrasonic vibration milling and conventional milling of optical glass.The experimental results show that under ultrasonic milling,the milling force is significantly lower than the conventional milling force.

In order to solve the problem that large items are not convenient to be carried under the condition without elevator,an electric auxiliary stair climbing machine based on the slider-crank mechanism is designed,in which 24 V lithium battery is used as the power supply and a decelerating motor is used as power output mechanism of the stair climbing machine. The optimization of slider guide inclination is analyzed by using motion of UG software. Through the experiment of the physical prototype,the distance difference between the slider movement between the highest point and the lowest point is 17. 674 cm,which meets the coordination standard of the building staircase module of our country. The analysis of ANSYS shows that the strength meets the stress requirements during the movement of the stair climbing machine,the stair climbing machine can run smoothly on the stairs,the safety and reliability of the stair climbing process will be ensured through the mechanical structure.

The variation law of nonlinear ultrasonic parameters for the samples sensitized at 650℃ for 2, 6, 10h was discussed using nonlinear ultrasonic testing technique and XRD pattern as well as microstructure. The results indicate that normalized nonlinear parameters(β/β0) of the samples show a monotonous growth trend with the increase of the sensitized time, and normalized nonlinear parameters(β/β0) of the samples sensitized with 2,6,10h increase to 28%, 32% and 43% respectively compared with that of the base material, meaning that it is feasible to use nonlinear parameter to characterize the sensitivity degree. It is analyzed that the mismatch between the carbide (Cr23C6) precipitated on the grain boundary and the austenitic matrix causes the local strain fields which interfere with the propagation of ultrasonic wave in the solid sample. In addition, the increment of precipitation phase exacerbates further the distortion of the ultrasonic with prolonging of the sensitization time.

Based on an as-serviced 25Cr35Ni type steel, the high temperature property evaluation using stress relaxation test(SRT) method and residual life prediction were studied. The results show that creep rupture property decreases because of the formation of network carbides along grain boundaries and coarsening of secondary carbides in the austenitic matrix. Based on the relationship of stress relaxation strain rate curves obtained at different temperatures, and the extrapolation equation of stress relaxation rate-rupture time, it is capable to perform residual life evaluation by combining SRT data and a small amount of creep rupture test(CRT). Good agreement is observed for predicting results performed by current method and traditional method.

Currently, sharp contradiction exists between edible oil supply and demand in China. Developing edible oil production largely depends on the development of rapeseed production. For less land competition between cereal crops and rapeseed, the Yangtze River Basin is the main rapeseed producing area in China. But, problems (such as a large amount of labor, high labor cost and low efficiency) seriously restrict the development of rapeseed industry. The whole-process mechanization (including sowing, management, and harvesting) is the key to boosting rapeseed production. Thus we reviewed the research on rapeseed biological characteristics, planting habits, and rotation systems, to focus on high yield loss rate during harvesting. We expected to improve mechanized harvesting of rapeseed in China. The research processes on breeding ideotype rapeseed suitable for mechanized harvesting as resistance to lodging, pod cracking, and sclerotinia disease were also discussed. The aim was to provide an insight on breeding and cultivation management of rapeseed suitable for high efficient mechanized harvesting. [ABSTRACT FROM AUTHOR]

For a low grade copper-lead-zinc sulfide ore, the flotation separation experiment was carried out by the process of preferential flotation of copper-lead--zinc-sulfur mixed flotation and zinc-sulfur separation. A high-efficiency and selective copper collector BK916 and lead collector BK906 were used to conduct a copper-lead sequential preferential flotation test study. In the experimental study of zinc-sulfur separation, the combination of environmental protection inhibitor BD and lime effectively inhibited the pyrite in zinc-sulfur mixed concentrate. It can obtain copper concentrate with copper grade of 20.68% and copper recovery rate of 72.98%, lead concentrate with lead grade of 61.38% and lead recovery rate of 73.57%, zinc concentrate with zinc grade of 46.31% and zinc recovery rate of 73.17%, and sulfur concentrate with sulfur grade of 48.54%. [ABSTRACT FROM AUTHOR]

The stress relaxation data up to 8760h at 550℃ and 600℃of 12Cr-1Mo-1W-0.25V heat-resistant steel were used as the object to study the method of how to accurately and effectively predict long-term relaxation stress by using short-time relaxation data. When relaxation model is used to extrapolate the long-term relaxation stress directly, it is found that the parameters of the relaxation model depend on the length of the fitted data. The time-dependent parameter model, naming as timing parameter method, is proposed to predict the long-term relaxation stress with high accuracy. By comparison of the results of timing parameter method and direct extrapolation method, timing parameter method has obvious advantages in predicting long time relaxation stress with short time relaxation data, as the timing parameter method has a more accurate prediction than that of direct extrapolation method.

An ideal balance between the post length within root and the coronal extension should exist. Some theo⁃ ries advocated the use of the longest post as possible as the apical seal is not disturbed. Others advocated that the post should be longer than the crown or that the post should be a certain fraction of the length of the root. The conventional post length has been equal to 2/3⁃3/4 of the root length from half a century ago. Most of these theories have emphasized the post length in order to achieve sufficient retention and rigidity for coronal restoration. However, dental materials are evolving.With the use of fiber post and resin cement, stress distribution and post retention are improved over convention⁃ al metal post and zinc phosphate or glass⁃ionomer cement. Therefore, with improved bonding strength of fiber post, the post length within root should be minimized to maintain sufficient coronal rigidity. Factors affecting fracture resistance balance of a post⁃and⁃core system include the amount of Ferrule height (FH), Post length in root (PLIR), Post length in bone (PLIB), Abutment height (AH), Core length (CL) and Post length out of bone (PLOB). In view of the factors men⁃ tioned above, this paper investigated the mechanical factorsin a post⁃and⁃core system with literature review.

{332} deformation twinning is a unique deformation mode which can have some special features and a strong influence on the mechanical properties for metastable β-type titanium alloys.{332} deformation twinning has already got more and more attention.The research situation and observed characteristics for the {332} deformation twinning are summarized in this paper.Some typical models for the {332} twinning are reviewed,and their assumptions and remaining problems are presented so as to provide useful information for understanding and revealing the deformation mechanism of {332} deformation twinning.

The corrosion behaviors of HR3C pre-coated alkali metal sulphate in SO2 atmosphere at different temperatures were investigated by means of XRD,SEM (EDS) and EMPA in order to discuss the corrosion resistance mechanism to SO2 of HR3C.The results show that the corrosion kinetic curves follow parabolic law.The corrosion products are mainly composed of (Fe,Cr) oxides,minor compound oxides with spinel structure as well as (Fe,Ni) sulfides.The increment in SO2 content increases significantly the oxide films in thickness,and deteriorates the adhesion to the oxide scale and matrix.In addition,the porosities in the corrosion affected zone (the interface between the oxide films and the matrix) increase and a CrS belt exits in the interface between the oxide layer and the corrosion affected zone.The analysis shows that the corrosion of HR3C in SO2 environment is resulted from the oxidation,sulfidation of the alloy,moreover,the sulfation of metallic oxides and the formation of ternary composed alkali metal sulfate as well as the dissolution of Fe in melted salt also contribute to the corrosion.

Based on the discussion of the factors influencing the nonlinear ultrasonic testing, the feasibility of nondestructive evaluation of HR3C fireside corrosion was investigated using nonlinear ultrasonic testing. The results show that the number of pulse string is no more than 2df/c and the installation of Hanning window is helpful to reduce the disturbance of the system, in addition, the rough surface of the sample has a significant impact on the nonlinear parameter β. The nonlinear coefficient demonstrates a phased growth trend as corrosion time prolongs. At the initial stage of corrosion(within 50h),there are small increments within 20% in the nonlinear coefficient, however,the nonlinear coefficient β is increased obviously with the duration time to 150h. Compared with un-corroded sample, the amplification in the sample corroded for 200h reaches to 260%. The monotonous varieties in nonlinear coefficient are consistent with the aggravation of corrosion damage,hence,it is feasible to nondestructively evaluate HR3C fireside corrosion by means of ultrasonic nonlinear testing.

Cyberspace is the fifth sovereignty space after the sea,land,sky and space.The security of cyberspace is closely relative to national security.How to discover threat in time,how to defense network attack,how to trace attackers were the problems to be selved.Facing the polyphyletic,isomeric,disconnected properties in the cyberspace,bases on a credible IaaS,a cyberspace security situation awareness was constructed by ontology,semantic Web and linked data theory.While guarantee the access security of integrating data,the model could make a comprehensive analysis on the properties in the cyberspace,which contributes to cyberspace governance.

From the perspective of engineering practice,analysis of stiffened composite wall slab with a Delaminatong at the stringer interface in this paper,and typical structure / typical Delaminatong type is simulated using finite element method. In view of reasons of Delaminatong,feasible proposals of damage control and repair have been raised. Full-scale static test of structures with Delaminatong has indicated that the integer load-carrying capability is determined by the stability of the wall slab. Going with the increase of the working stress due to the Delaminatong between the stringer and the skin,local sustain stiffness of the skin is reduced,resulting in descending of initial bucking load and integer capability of load-carrying. Correctness of the finite element analysis method has been preferably verified by the results of test.

In the petroleum and petrochemical industry, the compressor and its connected pipeline system often vibrate because of the long-time service, so it is necessary to analyze and control the vibration of the compressor, especially the piping system. We solve the problem of vibration compressor pipeline system by adjusting the system stiffness control scheme. We propose a general realization of different elastic stiffness of connection by adjusting the number of dish spring washer and installation of pipe clamp. The number and position of pipe clamps are determined by the analysis of pipeline system vibration, which helps to design the pipe clamp constraints. The effect of this type of constrained vibration control is validated good in practice, which provides a convenient and new idea for researchers to reduce the vibration of pipeline system. [ABSTRACT FROM AUTHOR]

Lightweight aggregate mortar was prepared by using titanium-bearing blast furnace slag as a lightweight aggregate and ordinary Portland cement as binder. The effect of cement content and water to cement ratio on the properties of mortar for hollow blocks was studied, and trial production of hollow blocks based on these mortars were carried out in the factory. The research and production results indicated that lightweight aggregate mortar with good performance could be obtained with a water to cement ratio of 0.7 and cement content of 10% to 18%. Hollow blocks with compressive strength of 4.7~7.5 MPa and dry density of 1083~1197 kg/m³ could be obtained. Moreover, slight pozzolanic reactivity of titanium-bearing blast furnace slag had a significant effect on the improvement of the interfacial transition zone between aggregate and paste. [ABSTRACT FROM AUTHOR]

Taking styrene migration amount as a test indicator, the migration of residual styrene in polystyrene cups to three types of food and alcohol stimulants was investigated comparatively, and the suitable food stimulants from the Chinese special food series were confirmed. The migration amount of styrene from the polystyrene cup to bean beverages;, tofu, porridge, and 10 and 20 vol % alcohol was detected using headspace-gas chromatography. Meanwhile, the migration amount of styrene from the cup to 50 and 95 vol% alcohol was determined by high-performance liquid chromatograph. The results indicated that the migration amount of styrene in the bean beverages was between the migration amounts in 20 and 50 vol% alcohol. The migration amounts of styrene in tofu and porridge was closed to the migration amounts in 10 and 20 vol% alcohol, which were much lower than that in 50 vol% alcohol. According to the migration results, 50 vol % alcohol was recommended as a simulant for bean beverages, and 20 vol % alcohol as a simulant for tofu and porridge. These results provided a data reference for reformulating the national food safety standards. [ABSTRACT FROM AUTHOR]

Temperature and light are two important environmental factors affecting seed germination, and phytochromes are the sensors of light and temperature. It is of great significance to investigate the interaction of phytochromes with light and temperature to regulate seed germination for guiding crop sowing. The aim of this study is to explore how the NtPHYB1 genotype regulates seed germination in response to change in light and temperature environments in tobacco. The average germination frequency of WT seeds was significantly higher than that of NtPHYB1-OE and NtPHYB1-RNAi seeds under 15 environments. The germination of NtPHYB1-OE seeds was inhibited by continuous light exposure, while the germination of NtPHYB1-RNAi seeds was repressed by darkness. At 15°C, the germinations of all three genotypic seeds were inhibited by the low-temperature, and the germination frequency of NtPHYB1-OE seeds was significantly lower than that of WT and NtPHYB1-RNAi seeds; while there was no significant effect in light signal. At 20°C and 25°C, the temperature signal promoted the ability of seed germination, and the signal of light was dispensable, resulting in the highest germination frequencies for NtPHYB1-OE and WT seeds. At 30°C and 35°C, the light signal was indispensable to maintain seed germination for all three genotypic seeds, resulting in the highest germination frequency for NtPHYB1-RNAi seeds. To sum up, there were interactions among NtPHYB1, photoperiod, and temperature in the regulation of seed germination in tobacco. The germination frequencies of tobacco seeds could be significantly improved by modifying NtPHYB1 gene or improving the cultivation environment. [ABSTRACT FROM AUTHOR]