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Advances in Manufacturing 2023年第4期11卷 694-707页

作者： Feng li li jia Ya Gu College of Electrical and Information Engineering Jiangsu University of TechnologyChangzhou213001JiangsuPeople’s Republic of China School of Mechatronics Engineering and Automation Shanghai UniversityShanghai200444People’s Republic of China School of Electrical Engineering and Automation Changshu Institute of TechnologyChangshu215500JiangsuPeople’s Republic of China

In this study,a novel approach for nonlinear process identification via neural fuzzy-based Hammerstein-Wiener model with process disturbance by means of multi-signal processing is *** Hammerstein-Wiener model consists of three blocks where a dynamic linear block is sandwiched between two static nonlinear ***-signal sources are designed for achieving identification separation of the Hammerstein-Wiener *** correlation analysis theory is utilized for estimating unknown parameters of output nonlinearity and linear block using separable signals,thus the interference of process disturbance is ***,the immeasurable intermediate variable and immeasurable noise term in identification model is taken over by auxiliary model output and estimate residuals,and then auxiliary model-based recursive extended least squares parameter estimation algorithm is derived to calculate parameters of the input nonlinearity and noise ***,convergence analysis of the suggested identification scheme is derived using stochastic process *** simulation results indicate that proposed identification approach yields high identification accuracy and has good robustness.

关键词： Nonlinear process Parameter identification Hammerstein-Wiener model Neural fuzzy model Multiple signal processing

Response characteristics of PWR primary circuit under SBLOCAs considering steam bypass discharging

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Nuclear Science and Techniques 2024年第6期35卷 189-201页

作者： Shuai Yang Xiang-Bin li Yu-Sheng liu jia-Ning Xu de-Chen Zhang School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206China Nuclear and Radiation Safety Center MEPBeijing 100084China

Small-break superposed station blackout(SBO)accidents are the basic design accidents of nuclear power *** the condition of a small break in the cold leg,SBO further increases the severity of the accident,and the steam bypass discharg-ing system(GCT)in the second circuit can play an important role in guaranteeing core *** explore the influence of the GCT on the thermal-hydraulic characteristics of the primary circuit,RELAP5 software was used to establish a numerical model based on a typical pressurized water reactor nuclear power *** different small breaks in the cold-leg super-posed SBO were selected,and the impact of the GCT operation on the transient response characteristics of the primary and secondary circuit systems was *** results show that the GCT plays an indispensable role in core heat removal during an accident;otherwise,core safety cannot be *** GCT was used in conjunction with the primary safety injection system during the placement *** the break diameter was greater than a certain critical value,the core cooling rate could not be guaranteed to be less than 100 K/h;however,the core remained in a safe state.

关键词： Steam bypass discharging Pressurized water reactor SBLOCA Numerical simulation

[Impact of arsenic exposure on the hepatic metabolic molecular network in obese pregnant mice using metabolomics and proteomics]

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Se pu = Chinese journal of chromatography 2025年第1期43卷 50-59页

作者： li-Jing Cai Yan Wang Jun-Feng Tan Hai-Xia Zhou Shi-jia liang Yan Wu Jie Zhang School of Public Health Xiamen University Xiamen 361102 China. School of Public Health Fujian Medical University Fuzhou 350122 China.

Arsenic is a ubiquitous environmental toxin that can affect normal physiological processes. Although the health impacts of arsenic have been investigated, its influence on hepatic metabolism in obese pregnant women and the underlying mechanisms remain unclear. Multi-omics analysis, including metabolomics and proteomics, can improve the understanding of arsenic-induced hepatotoxicity in obese pregnant women. This study aimed to investigate the adverse effects of gestational arsenic exposure on hepatic metabolism in high-fat-diet-induced obese pregnant mice. Following arsenic exposure during pregnancy, the liver tissue was evaluated comprehensively using metabolomics and proteomics techniques combined with pathological and biochemical analyses. Arsenic exposure not only significantly increased lipid accumulation in the livers of obese pregnant mice but also elevated inflammatory factors and oxidative stress markers. Specifically, histopathological examination revealed more steatosis, inflammatory cell infiltration, and hepatocyte ballooning in the livers of arsenic-exposed mice than in those of controls. These changes indicate that arsenic exposure exacerbates hepatic lipid accumulation and induces liver damage in the context of obesity. Metabolomic analysis provided further insight into the metabolic-level disruption caused by arsenic exposure. Significant changes were observed in lipid metabolism pathways, particularly the arachidonic acid metabolism pathway. As arachidonic acid and its metabolites play important roles in inflammation and oxidative stress, this pathway may be critical in arsenic-induced hepatotoxicity. Additionally, proteomic analysis showed differences in the expression levels of several key proteins involved in lipid synthesis, oxidative stress, and inflammatory response. Notably, oxidative-stress-related proteins, including glutathione peroxidase 4 (GPX4), were upregulated, suggesting an increased oxidative burden. In summary, there are complex i

关键词： arsenic liver metabolomics obesity pregnant mice proteomics

Pressure and Spectral density of Fermions at Finite Temperature

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Chinese Physics Letters 1999年第10期16卷 709-711页

作者： HOU de-fu U.Heinz li jia-rong Institute of Particle Physics Huazhong Normal UniversityWuhan 430079 Institut fur Theoretische Physik Universitat RegensburgD-93040 RegensburgGermany

The pressure of a fermion system is expressed as a mass integral over the full two-point spectral densities within the real time formalism by use of the Keldysh representation for the *** simpliSes the calculation significantly and allows a Dyson *** expression is used to demonstrate that potential infrared divergences are rendered *** apply it to check the pressures of an ideal fermion gas and of a chemically non-equilibrated quantum chromodynamics plasma.

关键词： Fermi apply render

顶空固相微萃取/气相色谱法快速萃取-解吸土壤中7种芳香族化合物

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分析测试学报 2025年第1期44卷 172-179页

作者：李丙阳王钊陈佳邱洪灯新疆师范大学化学化工学院新疆乌鲁木齐830000 中国科学院兰州化学物理研究所甘肃省天然药物重点实验室甘肃兰州730000

利用氧化石墨烯功能化修饰固相微萃取(GO@SPME)针,结合气相色谱(GC)-氢火焰离子化检测器(FID)建立了检测土壤中7种挥发性芳香烃及其衍生物(包括甲苯、氯苯、乙苯、对二甲苯、邻二甲苯、硝基苯和萘)的快速萃取和解吸策略。考察了萃取液... 详细信息

利用氧化石墨烯功能化修饰固相微萃取(GO@SPME)针,结合气相色谱(GC)-氢火焰离子化检测器(FID)建立了检测土壤中7种挥发性芳香烃及其衍生物(包括甲苯、氯苯、乙苯、对二甲苯、邻二甲苯、硝基苯和萘)的快速萃取和解吸策略。考察了萃取液体积、搅拌速率、萃取温度、加盐量、解吸温度、萃取时间和解吸时间对目标物萃取效果的影响,确定在土壤样品中加入内标物质(氘代甲苯),经甲醇提取,顶空固相微萃取快速富集,再结合GC-FID进行检测,基质匹配内标法定量分析。在优化的实验条件下,该方法在15 s内可实现对目标物的快速萃取与解吸(萃取时间12 s,解吸时间3 s)。土壤样品中7种挥发性芳香烃及其衍生物的线性关系良好,相关系数(r^(2))均不小于0.9989,方法检出限(LOD,S/N=3)为1.71~11.60μg/g,定量下限(LOQ,S/N=10)为5.70~38.67μg/g;在3个不同加标水平(60、120、180μg/g)下的平均回收率为87.3%~109%,相对标准偏差(RSD)不大于12%。该方法前处理简单快速,成本较低,数据稳定可靠,适用于土壤样品中芳香族类化合物的快速检测。

关键词：芳香烃及其衍生物氧化石墨烯顶空固相微萃取气相色谱法快速萃取-解吸策略土壤

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Two-dimensional ballistic transistors for advanced-node integrated circuits

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National Science Review 2024年第3期11卷 9-10页

作者： jia li Xidong Duan Hunan Provincial Key Laboratory of Two-Dimensional Materials State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University

As the feature size of metal-oxide-semiconductor-field-effect-transistors(MOSFETs) in integrated circuits(ICs)is reduced to sub-10-nm, the traditional channel materials are plagued by enhanced scattering and short-channel effects, leading to the deterioration of switching characteristics and the increase of power consumption.

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Adsorption of 2-naphthalenesulfonic acid/sulfuric acid/sulfurous acid from aqueous solution by iron-impregnated weakly basic resin：Equilibrium and model

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Chinese Journal of Chemical Engineering 2016年第11期24卷 1522-1526页

作者： Changhai li Dongmei jia department of Chemical Engineering Binzhou University Binzhou 256603 China Research Center of Chemical Engineering and Technology Binzhou University Binzhou 256603 China

Commercial grade weakly basic resin D301 was impregnated with iron through a simple method using ferric chloride. Experiments for single, bisolute and trinary competitive adsorption were carried out to investigate the adsorption behavior of 2-naphthalenesulfonic acid(NSA), sulfuric acid and sulfurous acid from their solution at 298 K onto the novel hybrid iron impregnated D301(Fe-D301). Adsorption affinity of NSA on Fe-D301 was found to be much higher than that of sulfuric acid, while adsorption affinity of sulfuric acid was slightly higher than that of sulfurous acid. The data of single-solute adsorption were fitted to the Langmuir model and the Freundlich adsorption model. The non-ideal competitive adsorbed model coupled with the single-solute adsorption models were used to predict the bisolute and trinary-solute competitive adsorption equilibria. The NICM coupled with the Langmuir model yields the favorable representation of the bisolute and trinary-solute competitive adsorption behavior.

关键词： 2-naphthalenesulfonic acid Hybrid iron impregnated D301 Adsorption Non-ideal competitive adsorbed model Model Equilibrium

Ultrawide-band radar imagery from multiple incoherent frequency subband measurements

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Journal of Systems Engineering and Electronics 2011年第3期22卷 398-404页

作者： Xiaojian Xu jia li School of Electronic and Information Engineering Beihang UniversityBeijing 100191P.R.China department of Electrical Computer and Systems EngineeringRensselaer Polytechnic InstituteTroy NY12180USA

The problem of combined radar imagery from multiple sparse frequency subbands initially incoherent to each other is of practical importance for radar target discrimination.A new coherent processing technique based on probability density analysis of the subband data is proposed,which is applicable for radar imaging from measurements of two or more initially incoherent radar *** coherence parameters for both amplitude and phase are obtained by combining modern spectral analysis with probability density *** major advantage of the proposed technique lies in that it enables much more robust cohering for the sparse subband data of real-world complex targets.

关键词： radar imagery coherent processing subband spectral analysis.

Experimental Investigation on Heat Transfer Coefficient during Upward Flow Condensation of R410A in Vertical Smooth Tubes

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Journal of Thermal Science 2015年第2期24卷 155-163页

作者： YANG Yunxiao jia li Institute of Thermal Engineering School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale

This paper presents an experimental investigation on condensation of R410 A upward flow in vertical tubes with the same inner diameter of 8.02 mm and different lengths of 300 mm, 400 mm, 500 mm and 600 mm. Condensation experiments were performed at mass fluxes of 103-490 kg m-2s-1. The saturation temperatures of experimental condition were 31℃, 38℃and 48℃, alternatively. The average vapor quality in the test section is between 0.91 and 0.98. The effects of tube length, mass flux and condensation temperature on condensation were discussed. Four correlations used for the upward flow condensation were compared with the experimental data obtained from various experimental conditions. A modified correlation was proposed within a ±15% deviation range.

关键词： Condensation R410A Flow upward Heat transfer coefficient Refrigerant

Climate tipping-point potential and paradoxical production of methane in a changing ocean

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Science China Earth Sciences 2018年第12期61卷 1714-1727页

作者： Hongyue DANG jia li State Key Laboratory of Marine Environmental Science Institute of Marine Microbes and EcospheresCollege of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Tianjin Branch of China National Offshore Oil Corporation Ltd Tianjin 300452China

The global warming potential of methane(CH_4) is about 30 times stronger than that of carbon dioxide(CO2) over a century timescale. Methane emission is hypothesized to have contributed to global climate change events and mass extinctions during Earth's history. Therefore, the study of CH_4 production processes is critically important to the understanding of global climate change. It has been a dogma that biogenic CH_4 detectable in the oceans originates exclusively from the anaerobic metabolic activity of methanogenic archaea in hypoxic and anoxic environments, despite reports that many oxic surface and near-surface waters of the world's oceans are CH_4-supersaturated, thereby rendering net sea-to-air emissions of CH_4. The phenomenon of CH_4 production in oxic marine waters is referred to as the "ocean methane paradox". Although still not totally resolved, recent studies have generated several hypotheses regarding the sources of CH_4 production in oxic seawater. This review will summarize our current understanding of the importance of CH_4 in the global climate and analyze the biological processes and their underpinning mechanisms that lead to the production of CH_4 in oxic seawater environments. We will also tentatively explore the relationships of these microbial metabolic processes with global changes in climate and environment.

关键词： Ocean methane paradox Gas hydrate Marine particles Methylphosphonate DSMP Global warming Ocean deoxygenation Ocean acidification