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DFT Investigations About Pyrazine Molecules on Si(100)-2×1 Surface

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Chemical Research in Chinese Universities 2007年第4期23卷 444-451页

作者： YU Ang-yang QU Yong-quan HAN Ke-li he guo-zhong Center for Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China

It is important to understand the interface of aromatic molecules on semiconductor surfaces because of the rich functionality of such molecules on semiconductor surfaces. The chemisorption of pyrazine molecules on the Si （100）- 2×1 surface has been investigated using the B3LYP density functional theory with Si9H12 one-dimer and Si15Hl6 two-dimer cluster models. The calculated results predict that N-dative bonded-state, C2=C5 [E4＋2] and the tight- bridgel,2,5,6 products may coexist on the Si（100）-2 × 1 surface.

关键词： Density functional theory Surface Activation energy Adsorption energy

基于双目结构光的镶块铸件初序加工在线定位系统

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制造业自动化 2024年第7期46卷 151-156页

作者：衡思迎常青李国和张忠选天津汽车模具股份有限公司模具技术研究院天津300308 天津职业技术师范大学汽车模具智能制造技术国家地方联合工程实验室天津300350 天津敏捷云科技有限公司天津300308

镶块铸件是典型的单件编程、单件加工的产品,解决单件产品在机床上的快速定位是实现单件非标产品标准化、自动化、柔性化生产的关键。为此,提出并研究基于双目结构光的镶块铸件加工在线定位系统。采用Gamma变换进行条纹图像增强和三频... 详细信息

镶块铸件是典型的单件编程、单件加工的产品,解决单件产品在机床上的快速定位是实现单件非标产品标准化、自动化、柔性化生产的关键。为此,提出并研究基于双目结构光的镶块铸件加工在线定位系统。采用Gamma变换进行条纹图像增强和三频外差相位展开原理对镶块铸件进行三维重建;通过将提取的镶块铸件三维轮廓与CAD实体进行对齐计算,获得编程坐标系上的偏移量;通过后处理将偏移量写入NC程序,实现镶块铸件初序加工基准的快速确定。系统在实际生产中具有较大的应用价值,对实现镶块加工的自动化和智能化具有很好的促进作用。

关键词：镶块铸件智能制造双目结构光三维重建数模对齐

Viologen-based flexible electrochromic devices

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Journal of Energy Chemistry 2024年第6期93卷 453-470,I0012页

作者： Wenwen Wu Shanlu guo Jing Bian Xingyu he Haizeng li Jianmin li College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina Department of Pathology College of MedicineUniversity of CincinnatiCincinnati 45221OhioUSA Optics and Thermal Radiation Research Center Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237ShandongChina

Electrochromic technology has gained significant attention in various fields such as displays,smart windows,biomedical monitoring,military camouflage,human-machine interaction,and electronic skin due to its ability to provide reversible and fast color changes under applied *** the rapid development and increasing demand for flexible electronics,flexible electrochromic devices(FECDs)that offer smarter and more controllable light modulation hold great promise for practical *** electrochromic material(ECM)undergoing color changes during the electrochemical reactions is one of the key components in electrochromic *** the ECMs,viologens,a family of organic small molecules with 1,1'-disubstituted-4,4'-dipyridinium salts,have garnered extensive research interest,due to their well-reversible redox reactions,excellent electron acceptance ability,and the ability to produce multiple ***,viologen-based FECDs demonstrate color changes in the liquid or semisolid electrolyte layer,eliminating the need for two solid electrodes and thus simplifying the device ***,viologens offer significant potential for the development of FECDs with high optical contrast,fast response speed,and excellent *** review aims to provide a comprehensive overview of the progress and perspectives of viologen-based *** begins by summarizing the typical structure and recent exciting developments in viologen-based FECDs,along with their advantages and ***,the review discusses recent advancements in FECDs with additional functionalities such as sensing,photochromism,and energy ***,the remaining challenges and potential research directions for the future of viologen-based FECDs are addressed.

关键词： Flexible electrochromic devices Optical modulation Viologens Flexible electronics Multifunctional devices Electrochromism

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电机损耗研究综述及展望

机械研究与应用 2024年第1期37卷 182-186页

作者：李明辉张涛郑涛霍俊阳李国和韩林天津职业技术师范大学汽车模具智能制造技术国家地方联合工程实验室天津300222 天津职业技术师范大学机械工程学院天津300222

电机在运行过程中产生大量的热量会导致电机温升过高,从而影响电机正常运行。导致温升的重要原因是来自于电机内部的损耗问题,电机中的损耗主要包括铜损、铁损、机械损耗和杂散损耗四种类型。首先,根据四种损耗类型,从损耗产生原因、损... 详细信息

电机在运行过程中产生大量的热量会导致电机温升过高,从而影响电机正常运行。导致温升的重要原因是来自于电机内部的损耗问题,电机中的损耗主要包括铜损、铁损、机械损耗和杂散损耗四种类型。首先,根据四种损耗类型,从损耗产生原因、损耗计算、损耗影响、降耗方法等方面进行分析,并对四种损耗的计算方法进行研究,其中重点介绍电机铁耗计算分析方法。其次,基于损耗影响因素对电机结构进行优化设计,以通过实例验证降耗方法的可行性。对电机损耗的准确分析,有利于分析电机温升问题,这对设计低损耗、高效率电机有着重要的意义。

关键词：电机铜耗铁耗机械损耗杂散损耗损耗分析

Adenovirus-mediated expression of pig α(1,3) galactosyltransferase reconstructs Gal α(1,3) Gal epitope on the surface of human tumor cells

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Cell Research 2001年第2期11卷 116-124页

作者： XING li, guo HONG XIA, JIAN FEI, FANG HUANG, li he guo Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai China

Gal α(1, 3) Gal (gal epitope) is a carbohydrate epitope and synthesized in large amount by α(1, 3) galactosyltransferase [α(1, 3) GT] enzyme on the cells of lower mammalian animals such as pigs and mice. Human has no gal epitope due to the inactivation of α(1, 3) GT gene but produces a large amount of antibodies (anti-Gal) which recognize Gal α(1, 3) Gal structures specifically. In this study, a replication deficient recombinant adenoviral vector Ad5sGT containing pig α(1, 3) GT cDNA was constructed and characterized. Adenoviral vector-mediated transfer of pig α(1, 3) GT gene into human tumor cells such as malignant melanoma A375, stomach cancer SGC-7901, and lung cancer SPC-A-1 was reported for the first time. Results showed that Gal epitope did not increase the sensitivity of human tumor cells to human complement-mediated lysis, although human complement activation and the binding of human IgG and IgM natural antibodies to human tumor cells were enhanced significantly after Ad5sGT transduction. Appearance of gal epitope on the human tumor cells changed the expression of cell surface carbohydrates reacting with Ulex europaeus I (UEA I) lectins, Vicia villosa agglutinin (VVA), Arachis hypogaea agglutinin (PNA), and Glycine max agglutinin (SBA) to different degrees. In addition, no effect of gal epitope on the growth in vitro of human tumor cells was observed in MTT assay.

关键词： Adenoviral vector galactosyltransferase Gal α(1 3) Gal gene expression human tumor cell.

Molecular investigation into the transformation of recalcitrant dissolved organic sulfur in refinery sour water during stripping process

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Petroleum Science 2024年第3期21卷 2112-2119页

作者： Yu-guo li Chen he Chun-Mao Chen Fan liu Quan Shi State Key Laboratory of heavy Oil Processing China University of PetroleumBeijing 102249China State Key Laboratory of Coal Mining and Clean Utilization Beijing 100013China PetroChina Ningxia Petrochemical Company Yinchuan 750021NingxiaChina

Refinery sour water primarily originates from the tops of towers in various units and coker condensate,and cannot be discharged directly to a wastewater treatment plant due to high levels of chemical oxygen demand(COD)and organic sulfur *** after the recovery of H_(2)S from the sour water by the stripping process,the effluent still contains a high concentration of dissolved organic sulfur(DOS),which can have a huge bad *** chemical composition of dissolved organic matter(DOM)in refinery wastewater has been extensively studied,the investigation of recalcitrant DOS from sour waters remains *** the present study,chemical composition of sour water DOMs(especially DOS)was investigated using fluorescence spectroscopy(excitation-emission matrix,EEM)and mass spectrometry,including gas chromatography-mass spectrometry(GC-MS)and high-resolution Orbitrap *** GC-MS and EEM results showed that volatile and low-aromaticity compounds were effectively removed during the stripping process,while compounds with high hydrophilicity and humification degree were found to be more *** Orbitrap MS results showed that weak-polar oxygenated sulfur compounds were easier to be removed than oxygenated ***,the effluent still contained significant amounts of sulfur-containing compounds with multiple sulfur atoms,particularly in the form of highly unsaturated and aromatic *** Orbitrap MS/MS results of CHOS-containing compounds from the effluent indicate that the sulfur atoms may exist as sulfonates,disulfide bonds,*** the composition and structure of sour water DOS is crucial for the development of effective treatment processes that can target polysulfide compounds and minimize their impact on the environment.

关键词： Molecular transformation Dissolved organic sulfur Stripping process Refinery sourwater Orbitrap MS

Simulation of Ultrasonic Propagation in Transformers within Thermal Fields and Intelligent Methodology for Hot-spot Temperature Recognition

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Chinese Journal of Electrical Engineering 2024年第1期10卷 35-47页

作者： Dongxin he Dechao Yang Xinhua guo Jiefeng liu Haoxin guo Qingquan li Gilbert Teyssedre School of Electrical Engineering Shandong UniversityJinan 250061China School of Mechanical and Electronic Engineering Wuhan University of TechnologyWuhan 430070China School of Electrical Engineering Guangxi UniversityGuangxi 530004China UPS INPTCNRSLAPLACE(Laboratoire Plasma et Conversion d’Energie)University of ToulouseToulouse 31100France

Hot-spot temperature of transformer windings is a crucial indicator of internal ***,current methods for measuring the hot-spot temperature of transformers do not apply to those already in operation and suffer from data *** study introduces a novel inversion method that combines ultrasonic sensing technology,multiphysics simulation,and the K-nearest neighbors *** the penetrative ability and temperature sensitivity of ultrasonic sensing,a detailed physical field simulation model was *** study extensively investigates the characteristics of ultrasonic wave signals inside *** investigation includes different temperature fields,ranging from 40℃ to 110℃ at 10℃ intervals,and various ultrasonic wave emitter *** extracting the key features of the acoustic signals,such as the peak time,propagation time,and peak amplitude,an accurate inversion of the winding hot-spot temperature is successfully *** results demonstrate that this method achieves a high accuracy rate(98.57%)in inverting the internal winding hot-spot temperatures of transformers,offering an efficient and reliable new approach for measuring winding hot-spot temperatures.

关键词： Ultrasonic temperature measurement non-destructive testing oil-immersed transformers machine learning

Research on Credit Default Swaps Pricing Considering Moral Hazard Incentive under Reduce-Form Model

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Journal of Systems Science and Systems Engineering 2024年第3期33卷 311-329页

作者： liang Wu Kangjie he Zhe guo School of Mathematical Science Henan Institute of Science and TechnologyXinxiang453003China Public Front Office Department Industrial and Commercial Bank of ChinaZhengzhou450000China

Equilibrium pricing of credit default swaps(CDS)promotes efficient identification of credit risk in the market,which in turn leads to efficient allocation of ***,even when CDS have been priced in equilibrium,i.e.,when premiums are equal to anticipated payments,the moral hazard incentives of CDS buyers increase with CDS ***,it becomes an interesting research direction to study the impact of moral hazard incentives on the trading mechanism or pricing of derivatives(CDS).Most of the existing literature on the impact of moral hazard incentives in CDS pricing on derivatives trading mechanisms takes a macro perspective and focuses on the agreement risk *** literature exploring the analysis of the impact of moral hazard on the probability of agreement default from a micro perspective is not yet *** this in mind,this paper focuses on the mechanisms by which“fraud”,an extreme manifestation of micro-moral hazard incentives,affects the probability of *** paper introduces for the first time the concept of“claiming fraud”by credit protection buyers,which is different from the macro perspective of moral hazard incentives,and thus defines a specific extreme form of moral hazard ***,to address the intrinsic feature of the lack of economic explanatory power of the reduce-form model,this paper introduces a moral hazard incentive factor into the reduce-form model,and proposes a moral hazard state variable as a function of the asset value of the reference entity,which gives the reduce-form model strong economic explanatory power,and the default predictability is reduced by the description of the reduce-form *** terms of the object of study,this paper considers the issue of moral hazard incentives in the presence of claiming fraud in two reference entities to further explore the impact of moral hazard incentives on default protection at the micro level in terms of cyclic ***,based on the

关键词： Financial engineering moral hazard incentive claiming fraud reduce-form model probability of default calculation CDS pricing

Atmospheric Particulate Matter 2.5(PM_(2.5))Induces Cell Damage and Pruritus in Human Skin

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Biomedical and Environmental Sciences 2024年第2期37卷 216-220页

作者： he Qiao XUE Wan Ting li li YI Fan liNG Xiao guo Miao Miao College of Chemistry and Materials Engineering Beijing Technology and Business UniversityBeijing 100048China China light Industry Cosmetics Key Laboratory Beijing Technology and Business UniversityBeijing 100048China Beijing Lan Divine Technology Co.LTD Beijing 100872China

With the accelerated rate of urbanization in recent years,air pollution has become an environmental problem that requires urgent resolution,almost all of the world’s population exposed to pollution on a daily *** the... 详细信息

关键词： pollution Skin Human