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Mechanism and prediction of failure of diamond films deposited on various substrates by HFCVD

中国有色金属学会会刊：英文版 2004年第Z1期14卷 229-233页

作者： ZHOU Ling-ping sun Xin-yuan LI Shao-lu LI De-yi CHEN xiao-hua College of Material Science and Engineering Hunan University Changsha 410082 China College of Material Science and Engineering Hunan University Changsha 410082 China College of Material Science and Engineering Hunan University Changsha 410082 China College of Material Science and Engineering Hunan University Changsha 410082 China College of Material Science and Engineering Hunan University Changsha 410082 China

Diamond films were deposited on the WC-Co cemented carbide and Si3N4 ceramic cutting tool substrates by hot-filament-assisted chemical vapour deposition. The adherence property of diamond films was estimated using the critical load (Pcr) in the indentation test. The adhesive strength of diamond films is related to the intermediate layer between the film and the substrate. Poor adhesion of diamond films to polished cemented carbide substrate is owing to the formation of graphite phase in the interface. The adhesion of diamond films deposited on acid etched cemented carbide substrate is improved, and the peeling-off of the films often happens in the loosen layer of WC particles where the cobalt element is nearly removed. The diamond films' adhesion to cemented carbide substrate whose surface layer is decarbonizated is strengthened dramatically because WC phase forms by reaction between the deposited carbon and tungsten in the surface layer of substrates during the deposition of diamond, which results in chemical combination in the film-substrate interface. The adhesion of diamond films to silicon nitride substrate is the firmest due to the formation of chemical combination of the SiC intermediate layer in the interfaces. In the piston-turning application, the diamond-coated Si3N4 ceramic and the cemented carbide cutting tools usually fail in the form of collapsing of edge and cracking or flaking respectively. They have no built-up edge(BUE) as long as coating is *** it wears through, BUE develops and the cutting force on it increases 1 - 3 times than that prior to failure. This can predict the failure of diamond-coated cutting tools.

关键词： diamond film cutting tool adhesion failure prediction cemented carbide

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Genome editing opens a new era for physiological study and directional breeding of fishes

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Science Bulletin 2017年第3期62卷 157-158页

作者： sun, Yong-hua State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan China 430072

In recent years, the whole life science community has witnessed the advance and breakthrough in the genome editing technologies, including zinc-finger nucleases （ZFNs）, transcription activator-like effector （TALE） nucleases （TALENs） and clustered, regularly interspaced, short palindromic repeats （CRISPR）-CRISPR-associated （Cas） systems （CRISPR/Cas9） [1-3]. With these tools, scientists are able to introduce site-specific modifications in the genome of a wide range of organisms from invertebrates to vertebrates.

关键词：编辑技术基因组定向育种生理学无脊椎动物鱼类位点特异性生命科学

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Graph-matching-based character recognition for Chinese seal images

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Science China(Information Sciences) 2019年第9期62卷 37-50页

作者： Bin sun Shaojun hua Shutao LI Jun sun College of Electrical and Information Engineering Hunan University Information Department Fujitsu Research and Develop Center

Recognizing characters in Chinese seal images is important when researching ancient cultural artworks because the seals may contain critical historical information. However, owing to large intraclass variance and a limited number of training samples, recognizing such characters in Chinese seals is ***, this study proposes a graph-matching-based method to recognize characters in historical Chinese seal images. In the proposed method, a Chinese seal character is first modeled as a graph representing its underlying geometric structure. Then, two affinity matrices that measure the similarity of nodes and edge pairs are calculated with their local features. Finally, a correspondence matrix is calculated using a graph matching algorithm and the most similar reference is selected as the recognition result. Compared with several existing classification methods for seal image recognition, the proposed graph-matching-based method achieves better results, particularly in the case of limited samples.

关键词： graph model Chinese seal character recognition graph matching

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Cooperative Game Theory Based Coordinated Scheduling of Two-Machine Flow-Shop and Transportation

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Journal of Systems Science & Complexity 2023年第6期36卷 2415-2433页

作者： sun Wenjuan GONG hua LIU Peng School of Management Shenyang University of TechnologyShenyang110870China Liaoning Key Laboratory of Intelligent Optimization and Control for Ordnance Industry School of ScienceShenyang Ligong UniversityShenyang110159China

A cooperative game theoretical approach is taken to production and transportation coordinated scheduling problems of two-machine flow-shop(TFS-PTCS problems)with an interstage *** authors assume that there is an initial scheduling order for processing jobs on the *** cooperative sequencing game models associated with TFS-PTCS problems are established with jobs as players and the maximal cost savings of a coalition as its *** properties of cooperative games under two different types of admissible rearrangements are *** TFS-PTCS problems with identical processing time,it is proved that,the corresponding games areσ_(0)-component additive and convex under one admissible *** Shapley value gives a core allocation,and is provided in a computable *** the other admissible rearrangement,the games neither need to beσ_(0)-component additive nor convex,and an allocation rule of modified Shapley value is *** properties of the cooperative games are analysed by a counterexample for general problems.

关键词： Cooperative sequencing games core allocation production and transportation coordinated scheduling Shapley value two-machine flow-shop

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Methods for simultaneously evaluating reserve and permeability of undersaturated coalbed methane reservoirs using production data during the dewatering stage

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Petroleum Science 2020年第4期17卷 1067-1086页

作者： Jun-Tai Shi Jia-Yi Wu Zheng sun Zhi-hua xiao Cheng Liu Kamy Sepehrnoori State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum BeijingNo.18Fuxue RoadChangping DistrictBeijing 102249China MOE Key Laboratory of Petroleum Engineering China University of Petroleum BeijingNo.18Fuxue RoadChangping DistrictBeijing 102249China PetroChina Coalbed Methane Company Limited Beijing 100028China PetroChina Zhejiang Oil Field Company Limited Hangzhou 310023China The University of Texas AustinTX 78712USA

In this work,a flowing material balance equation(FMBE) is established for under saturated coalbed methane(CBM) reservoirs,which considers immobile free gas expansion effect at the dewatering *** on the established FMBE,five straight-line methods are proposed to determine the control area,initial water reserve,initial free gas reserve,initial adsorbed gas reserve,original gas in place,as well as permeability at the same ***,the proposed FMBE methods for undersaturated CBM reservoirs are validated against a reservoir simulation software with and without considering free gas ***,the proposed methods are applied in a field case when considering free gas expansion *** cases show that the straight-line relationships for the proposed five FMBE methods are excellent,and good agreements are obtained among the actual reserves and permeabilities and those evaluated by the proposed five FMBE methods,indicating the proposed five FMBE methods are effective and rational for CBM *** show that a small amount of free gas will result in a great deviation in reserve evaluation;hence,the immobile free gas expansion effect should be considered when establishing the material balance equation of undersaturated CBM reservoirs at the dewatering stage.

关键词： Coalbed methane OGIP Permeability evaluation Flowing material balance equation Gas expansion

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Occupational Health Risk Assessment of Benzene,Toluene,and Xylene in Shanghai

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Biomedical and Environmental Sciences 2021年第4期34卷 290-298页

作者： WANG Tong Shuai SONG Bo sun Qing hua LIN Yong Xin sun Yuan sun Pin JIA xiao Dong William W.Au MEI Can hua XIA Zhao Lin Department of Occupation Health and Toxicology School of Public HealthFudan UniversityShanghai 200000China Department of Occupation Health Shanghai Municipal Health CommissionShanghai 200000China Shanghai Institute of Occupational Disease for Chemical Industry(Shanghai Institute of Occupational Safety&Health) Shanghai 200000China Division of Health Risk Factors Monitoring and Control Shanghai Municipal Center for Disease Control and PreventionShanghai 200000China University of Medicine PharmacyScience and TechnologyTargu MuresRomania and Shantou University Medical CollegeShantou 515000GuangdongChina

Objective This study was designed to conduct a retrospective and systematic occupational health risk assessment(OHRA)of enterprises that used benzene,toluene,and xylene(BTX)in Shanghai,*** All data for the study were obtained from 1,705 occupational health examination and evaluation reports from 2013 to 2017,and a semiquantitative model following Chinese OHRA guidelines(GBZ/T 298-2017)was applied for the *** The selected enterprises using BTX were mainly involved in manufacturing of *** the exposure level method,health risk levels associated with exposure to BTX were classified as medium,negligible,or ***,the risk levels associated with benzene and toluene were significantly different according to job types,with gluers and inkers exhibiting greater health *** the same job type,the health risk levels assessed using the comprehensive index method were higher than those using the exposure level *** Our OHRA reveals that workers who are exposed to BTX still face excessive health ***,the risk level varied depending on job categories and exposure to specific ***,additional control measures recommended by OHRA guidelines are essential to reduce worker exposure levels.

关键词： Benzene Toluene Xylene Occupational health risk assessment Exposure level method Comprehensive index method

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Transactive Energy and Flexibility Provision in Multi-microgrids Using Stackelberg Game

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 505-515页

作者： Weiqi hua Hao xiao Wei Pei Wei-Yu Chiu Jing Jiang Hongjian sun Peter Matthews Department of Engineering Science University of OxfordOxford OX13PJUK Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China MOCaRL Lab Department of Electrical EngineeringNational Tsing Hua UniversityHsinchu 300044Chinese Taiwan Department of Mathematics Physics and Electrical EngineeringUniversity of NorthumbriaNewcastleNE18STUK Department of Engineering Durham UniversityDurhamDH13LEUK

Aggregating demand side flexibility is essential to complementing the inflexible and variable renewable energy supply in achieving low carbon energy *** of demand side flexibility,e.g.,dispatchable generators,storage,and flexible loads,can be structured in a form of microgrids and collectively provided to utility grids through transactive energy in local energy *** paper proposes a framework of local energy markets to manage this transactive energy and facilitate the flexibility *** distribution system operator aims to achieve local energy balance by scheduling the operation of multi-microgrids and determining the imbalance *** microgrid traders aim to maximize profits for their prosumers through dispatching flexibility sources and participating in localised energy *** decision making and interactions between a distribution system operator and multiple microgrid traders are formulated as the Stackelberg game-theoretic *** studies using the IEEE 69-bus distribution system demonstrate the effectiveness of the developed model in terms of facilitating local energy balance and reducing dependency on the utility grids.

关键词： Demand side flexibility game theory multimicrogrid prosumer smart grid transactive energy

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Synthesis and Biological Activity of Novel Spin Labeled Derivatives of 4′-Demethyl-4-deoxypodophyllotoxin

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Chemical Research in Chinese Universities 2010年第5期26卷 753-756页

作者： XU Jing sun xiao-hua ZHANG Jia-qiang ZHANG Zhi-wei TIAN Xuan State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 P. R. China

Seven novel spin labeled derivatives of 4＇-demethyl-4-deoxypodophyllotoxin with nitroxyl radi- cals（TMHPO and TMPRO） were prepared and their cytotoxic and antioxidative activities were tested. Their cytotoxic activities were tested against two tumor cell lines（A-549 and HL-60） in vitro. Among them, five compounds show higher inhibition activity against A-549 cells compared with the clinical drug VP-16（2） and parent compound 4＇-demethyl-4-deoxypodophyllotoxin（DDPT, 6）. Compounds 8, 10 and 13 show excellent inhibition activity against HL-60 cells. Furthermore, the antioxidative activities of them were tested. All the seven spin labeled compounds show stronger antioxidative activity compared with VP-16（2） and DDPT（6）. The partition coefficients P of these derivatives were determined.

关键词： 4'-Demethyl-4-deoxypodophyllotoxin Nitroxyl radical Antiturnor activity Antioxidative activity

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Design and synthesis of novel cytotoxic podophyllotoxin derivatives

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Chinese Chemical Letters 2010年第10期21卷 1153-1156页

作者： Wen Li Xi Qian Cai Yan Bo Tang hua sun Zhi Yan xiao School of Pharmacy Liaoning University of Traditional Chinese Medicine Dalian 116600 China Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine Ministry of Education & Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100050 China

In order to investigate the effect of different C4 linkage moieties on the cytotoxicity of podophyllotoxin derivatives, novel 4-N- and 4-C-substituted 4＇-O-demethylepipodophyllotoxin derivatives were designed and synthesized. All the compounds were tested against A549 and MCF-7 tumor cells in vitro, and six compounds showed significant cytotoxicity. The most active compound 9f was superior to GL-331, and exhibited potent cytotoxicity with IC50 value at 10^-7 mol/L level.

关键词： Podophyllotoxin C4-derivation Cytotoxicity

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Prevalence and features of fatty liver detected by physical examination in Guangzhou

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World Journal of Gastroenterology 2013年第32期19卷 5334-5339页

作者： Xian-hua Liao Xu Cao Jie Liu xiao-hua Xie Yan-Hong sun Bi-Hui Zhong Department of Gastroenterology Huangpu Division of the First Affiliated HospitalSun Yat-sen University Physical Examination Center Huangpu Division of the First Affiliated HospitalSun Yat-sen University Department of Ultrasonography Huangpu Division of the First Affiliated HospitalSun Yat-sen University Department of Clinical Laboratory Huangpu Division of the First Affiliated HospitalSun Yat-sen University

AIM:To investigate the prevalence of fatty liver discovered upon physical examination of Chinese patients and determine the associated clinical ***:A total of 3433 consecutive patients who received physical examinations at the huangpu Division of the First Affiliated Hospital at sun Yat-sen University in Guangzhou,China from June 2010 to December2010 were retrospectively enrolled in the *** of biochemical tests,abdominal ultrasound,electrocardiography,and chest X-ray were *** diagnosis of fatty liver was made if a patient met any two of the three following ultrasonic criteria:(1)liver and kidney echo discrepancy and presence of an increased liver echogenicity(bright);(2)unclear intrahepatic duct structure;and(3)liver far field echo ***:The study population consisted of 2201males and 1232 females,with a mean age of 37.4±12.8 *** all 3433 patients were considered,the overall prevalence of hyperlipidemia was 38.1%,of fatty liver was 26.0%,of increased alanine aminotransferase(ALT)and/or aspartate aminotransferase(AST)levels was 11.9%,of gallstone was 11.4%,of hyperglycemia was 7.3%,of hypertension was 7.1%,and of hyperuricemia was 6.2%.Of the 2605 patients who completed the abdominal ultrasonography exam,677(26.0%)were diagnosed with fatty liver and the prevalence was higher in males(32.5%vs females:15.3%,P50-year-old did not reach statistical *** 430 of the patients diagnosed with fatty liver had complete information;among those,increased ALT and/or AST levels were detected in only 30%,with all disturbances being mild or *** these 430 patients,the ov

关键词： Fatty liver Nonalcoholic Prevalence Hyperlipidemia Hyperglycemia Hypertension

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