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Fluorinated graphite nanosheets for ultrahigh-capacity lithium primary batteries

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Rare Metals 2021年第7期40卷 1708-1718页

作者： Xiao-Xia Yang guan-jun zhang Bao-Sheng Bai Yu Li Yi-Xiao Li Yong Yang Xian Jian Xi-Wen Wang Tianjin Lishen Special Power Supply Science and Technology Joint-Stock Co. Tianjin 300393China Tianjin Lishen Battery Joint-Stock Co. LtdTianjin 300384China School of Materials Science and Engineering Tianjin UniversityTianjin 300354China State Key Laboratory for Physical Chemistry of Solid Surface Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

For better performances of Ni-based catalysts at low temperatures,Ni/SiC catalyst doped with a little amount of additive La was successfully *** catalytic CO methanation activity tests showed that 3%La-Ni/SiC catalyst was excellent at a low reaction temperature(95.9%CO conversion and 85.1%CH4 selectivity at250℃)with a superior stability compared with Ni/SiC(3.4%CO conversion and 0%CH4 selectivity at 250℃).This can be attributed to that the addition of La can markedly improve the dispersibility of active metal Ni and reduce the particle sizes of Ni nanoparticles or clusters,and can also regulate the interaction between active components and ***,the high thermal conductivity and thermal stability could avoid the generation of hot spots in the catalyst *** results will promote the development of highly active Ni-based catalysts for the low-temperature methanation reaction.

关键词： Graphite nanosheets Carbon fluoride Primary battery Electrolyte Soft pack battery

3D particle‐in‐cell simulation of positive streamer initiation in highly pressurized gaseous,liquid and supercritical CO_(2)with field ionization

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High Voltage 2021年第1期6卷 16-24页

作者： Muhammad Farasat Abbas Xu‐Chu Yuan Han‐Wei Li Jian‐Yi Xue An‐Bang Sun guan‐jun zhang State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anShaanxiChina

A 3D particle‐in‐cell/Monte Carlo collision model is used to investigate the streamer discharge inception in CO_(2) at elevated pressures including gaseous, liquid and supercritical phases. Generation of free electrons is a prerequisite for initiation and development of positive streamers. Field ionization from impurity molecules of low density and low ionization energy is assumed as the source of primary ionization in the model. The field dependent generation rate of electrons is calculated by Zener's model. Tree‐like streamer with filamentary shape presents at the needle tip and propagates to-wards the plane electrode in all three phases of CO_(2), with differing in length and propagation speed. Furthermore, the influence of different parameters such as applied voltage, electrode tip size, and ionizable density and ionization potential of impurity molecules on the evolution of streamer discharge in supercritical CO_(2) are investigated. Simulation results obtained from the 3D model agree well with experimental observations in the literature, which show that field ionization might be one of possible ionization sources in pressurized CO_(2) in the presence of high electric field.

关键词： field. ionization gaseous

An analysis on dealing with audit failure

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Journal of Modern Accounting and Auditing 2009年第7期5卷 62-65页

作者： zhang guan-jun zhang Lin School of Accounting Zhongnan University of Economics and Law Wuhan 430074 China

Many highly publicized accounting scandals of the recent past seriously caused enormous losses to investors, hindered the healthy development of the capital market and damaged the credibility of the accounting profess... 详细信息

关键词： CPA audit failure countermeasures

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构建比较美学的方法论新探

艺术百家 2006年第6期22卷 202-203页

作者：管君章青岛理工大学艺术学院山东青岛266033

比较仍是构建比较美学的方法论的精髓,但是中西差异并非“中西对立”,中西比较美学的任务是通过比较找到审美理论的本质。

关键词：美学比较美学方法论审美

Test Equipment Selection and Deployment of Materiel System Based on Grey Situation Decision

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Journal of Electronic Science and Technology of China 2009年第4期7卷 331-335页

作者： Xi-Xiang Chen Jing Qiu guan-jun Liu Yong zhang College of Mechatronical Engineering and Automation National University of Defense Technology Changsha 410073 China

The situation is constructed when the tests are considered as events and the spare test equipments are considered as strategies. The model of grey situation decision for the test equipment selection and deployment （TESD） is founded. Through analyzing each decision objectives, their relative weights are calculated via analytic hierarchy process （AHP）. The grey situation effect matrix under each objective is computed so that the comprehensive effect measure matrix can be obtained when all of the objectives are traded off by their weights. Finally, the decision-maker can select the optimal situations by the value of the measures and such situations form the overall concept for TESD. The paper combines the AHP with grey situation decision to select and deploy the test equipments optimally. Our experimental results show that the proposed method is effective and efficient.

关键词： Effect measure grey situation decision test equipment testability.

The role of inflammatory mediators in severe acute pancreatitis and regulation of glucocorticoids

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Hepatobiliary & Pancreatic Diseases International 2003年第3期2卷 458-462页

作者： Zi-Fa Wang Cheng-En Pan Yi Lu Shao-Gao Liu guan-jun zhang Xue-Bin zhang the Departments of Surgery and Pathology First Hospital, Xi’an Jiaotong University, Xi’an 710061, China the Department of Surgery, University of Pittsburgh, NW607, Montefiore University Hospital, 3459 Fifth Avenue, Pittsburgh, PA 15213, USA Department of Surgery University of Pittsburgh NW607 Montefiore University Hospital 3459 Fifth Avenue Pittsburgh PA 15213 USA. ziw3@pitt.edu

OBJECTIVE: To investigate the effect of glucocorticoids on systemic inflammatory mediator release in rats with acute pancreatitis and the outcome of dexamethasone in treatment of acute pancreatitis. METHODS: Sixty-eight Wistar rats were divided into sham, acute pancreatitis, and treatment (intravenous dexamethasone 0.5 mg/kg) groups. Experimental acute pancreatitis was induced by the injection of 5% sodium taurocholate (0.1 ml/100 mg body weight) into the pancreatic-biliary duct. The bIood samples were obtained and examined for 6-keto-PGI_1α, TXB_2 and IL-6 postoperatively at 3,6 and 12 hours, respectively. The pancreatic samples were evaluated by a blinded method. Twelve-hour survival rate was determined and compared between the groups. RESULTS: The high serum concentrations of 6-keto-PGI_1α, TXB_2 and IL-6 were noted in the rats with acute pancreatitis associated with pancreatic hemorrhage and necrosis. Their 12-hour survival rate was 42.9%. The rats in the treatment group survived with significantly reduced serum concentrations of 6-keto-PGI_1α, TXB_2 and IL-6 (P<0.05). Their pancreatic morphology was normal. CONCLUSION: Dexamethasone may reduce the serum concentration of 6-keto-PGI_1α, TXB_2, and IL-6, and the severity of acute pancreatitis while increasing the survival rate of rats with acute pancreatitis.

关键词： acute pancreatitis inflammatory mediators dexamethasone

基于匹配序的合作对策联盟形成决策方法及其应用

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运筹与管理 2016年第6期25卷 39-46页

作者：关菲栗军张强河北经贸大学数学与统计学学院河北石家庄050061 国网石家庄供电分公司河北石家庄050000 北京理工大学管理与经济学院北京100081

合作对策中,联盟的形成过程是联盟一切活动的基础,直接影响着合作的稳定性与可持续发展。本文在分析局中人心理,情感,现实等因素对联盟形成所产生影响的基础上,首先定义了主观偏好标度值量化了心理、情感等因素,定义了收益分配函数将现... 详细信息

合作对策中,联盟的形成过程是联盟一切活动的基础,直接影响着合作的稳定性与可持续发展。本文在分析局中人心理,情感,现实等因素对联盟形成所产生影响的基础上,首先定义了主观偏好标度值量化了心理、情感等因素,定义了收益分配函数将现实因素量化,构建了综合匹配函数作为局中人选择合作伙伴的一个序标准,通过定义匹配请求、交互匹配、直接交互匹配等概念,构建了基于匹配序的联盟形成决策模型,并证明了在特定情况下直接交互匹配的存在必然性。其次,给出了基于匹配序的联盟形成方法步骤,演化了大联盟的形成过程。最后通过具体实例验证了该决策方法的有效性与合理性。结果表明,该方法能有效的形成一系列可行且稳定的联盟结构,能快速演化联盟的形成过程,为有效解决联盟形成问题奠定了良好基础。

关键词：合作对策联盟形成联盟结构匹配序可行联盟

Simulation of Negative Streamer in Transformer Oil under Nanosecond Pulse Voltage

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Simulation of Negative Streamer in Transformer Oil under Nan...

Low-temperature Plasma Promotes Fibroblast Proliferation in Wound Healing by ROS-activated NF-κB Signaling Pathway

中国物理学会第十八届全国静电学术会议

作者： Yuan Li Hai-bao Mu jun-bo Deng guan-jun zhang Shu-hong Wang State Key Lab of Electrical Insulation and Power Equipment School of Electrical Engineering Xi’an Jiaotong University

As dielectric liquids such as transformer oil have been widely used in high-voltage power apparatus and pulse power system, their electrical behavior subjected to high electric fields and the possible breakdown phenomena are of great practical interest. In this paper, the propagation process of negative streamer discharge from initiation till breakdown in transformer oil under nanosecond pulse voltage is modeled by a two dimensional axis-symmetric fluid model with finite element method. In this fluid model, three kinds of charge carriers, such as electron, positive and negative ions are utilized to account for the charge generation, recombination, and transport mechanisms behind the discharging process. The streamer discharge profile and distribution of electric field and space charge density are obtained under different conditions such as the amplitude of applied voltage and rise time. Simulation results show that the discharging phenomena of negative streamers are fundamentally different from positive streamers, namely positive streamers tend to be filamentary while negative streamers form in a bushy shape, which implies that physical mechanisms of the these two different polarity streamers are different. It can be found that space charges play an important role in negative streamers initiation and propagation. The rise time of applied voltage have evident influences on the average speed of streamer propagation. The current of discharge is calculated as a clear evidence of breakdown. It can be observed that negative streamers require over twice amplitude of applied voltage to initiate, compared with the positive streamers. It is considered that field-dependent molecular ionization predominates charge generation mechanism of streamer discharge process in transformer oil. The study would dedicate to clarify the process of negative discharge from inception to breakdown in transformer oil, as well as ionization mechanism in liquid dielectric.

关键词： transformer oil fluid model negative streamer discharge

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2018年第1期38卷 107-114页

作者： Xing-min SHI Gui-min XU guan-jun zhang Jin-ren LIU Yue-ming WU Ling-ge GAO Yang YANG Zheng-shi CHANG Cong-wei YAO Key Laboratory of Environment and Genes Related to Diseases Ministry of EducationSchool of Public HealthXi'an Jiaotong UniversityXi'an 710061China State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'an 710049China

Low-temperature plasma(LTP)has shown great promise in wound healing,although the underlying mechanism remains poorly *** the present study,an argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro and skin wounds in BALB/c *** in vitro analysis revealed that treatment of fibroblasts with LTP for 15 s resulted in a significant increase in cell proliferation,secretion of epidermal growth factor(EGF)and transforming growth factor-β1(TGF-β1),production of intracellular reactive oxygen species(ROS),and the percentage of cells in S phase,protein expression of phosphorylated p65(P-p65)and cyclin D1,but a noted decrease in the protein expression of inhibitor kappa B(IκB).The in vivo experiments demonstrated that 30-s LTP treatment enhanced the number of fibroblasts and the ability of collagen synthesis,while 50-s treatment led to the opposite *** results suggested that LTP treatment promotes the fibroblast proliferation in wound healing by inducing the generation of ROS,upregulating the expression of P-p65,downregulating the expression of IκB,and activating the NF-κB signaling pathway and consequently altering cell cycle progression(increased DNA synthesis in S phage).

关键词： low-temperature plasma fibroblast proliferation NF-κB signaling pathway cell cycle reactive oxygen species