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Effect of Zn Vaporization on Wetting of Al-galvanized Steel in Cold Metal Transfer Process

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Journal of Iron and Steel Research International 2016年第6期23卷 566-572页

作者： Qiao-li LIN Gao-jun MAO Qian HUANG Rui CAO jian-hong chen State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of Technology

The wetting of galvanized steel by molten Al alloys was studied in the cold metal transfer process by the sessile drop method using a high speed video *** wetting behavior can be divided into two typical cases,trending of non-wetting by using small wire feeding speed and wetting by using large wire feeding *** Leidenfrost effect is caused by the volatilization of Zn,which is responsible for the former *** enhanced wettability of steel by Al and the weakening of the Leidenfrost effect are responsible for the latter *** is the destabilizing factor for Al-steel joining that needs to be avoided by a reasonable design of process.

关键词： wetting camera evaporation latter weakening trending feeding boiling joining metallic

In-situ observation of microstructural evolution in reheated low carbon bainite weld metals with various Ni contents

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Journal of Iron and Steel Research International 2017年第12期24卷 1206-1214页

作者： Gao-jun Mao Rui Cao jian-hong chen Xi-li Guo Yong jiang Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina State Key Laboratory of Advanced Processing and Recycling of Non ferrous Metals Lanzhou University of TechnologyLanzbou 730050GansuChina Atlantic China Welding Concumables Inc.Zigong 643000SichuanChina

Microstructural evolution in weld metals was in-situ observed through utilizing a laser scanning confocal microscope at two cooling *** specimens with various nickel contents were adopted for the *** the specimen with low fraction of Ni（≤2 wt.%）,granular bainite microstructure（*** surface relief）transformation from intragranular nucleation site was in-situ observed,while,lath bainite microstructure originating from grain boundary of austenite was in-situ observed for specimens with high mass percentage of Ni（≥4 wt.%）.With increasing nickel content,the transformation temperature *** prior austenite grain size was initially depressed and subsequently coarsened dramatically with the addition of *** microstructure difference was ascribed to various nucleation sites and growth direction in the *** account of those observations,not only the chemical component,cooling rate and microstructure were systematically correlated,but also the microstructural evolution was definite.

关键词： Weld metal Ni content Bainite Nucleation site Growth In-situ observation

An immune-tabu hybrid algorithm for thermal unit commitment of electric power systems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 877-889页

作者： Wei LI Hao-yu PENG Wei-hang ZHU De-ren SHENG jian-hong chen School of Mechanical and Energy Engineering Zhejiang University Hangzhou 310027 China Department of Industrial Engineering Lamar University Beaumont 77710-0032 USA

This paper presents a new method based on an immune-tabu hybrid algorithm to solve the thermal unit commitment （TUC） problem in power plant optimization. The mathematical model of the TUC problem is established by analyzing the generating units in modem power plants. A novel immune-tabu hybrid algorithm is proposed to solve this complex problem. In the algorithm, the objective function of the TUC problem is considered as an antigen and the solutions are considered as antibodies, which are determined by the affinity computation. The code length of an antibody is shortened by encoding the continuous operating time, and the optimum searching speed is improved. Each feasible individual in the immune algorithm （IA） is used as the initial solution of the tabu search （TS） algorithm after certain generations of IA iteration. As examples, the proposed method has been applied to several thermal unit systems for a period of 24 h. The computation results demonstrate the good global optimum searching performance of the proposed immune-tabu hybrid algorithm. The presented algorithm can also be used to solve other optimization problems in fields such as the chemical industry and the power industry.

关键词： Immune algorithm (IA) Tabu search (TS) Optimization method Unit commitment

Current recognition and management of intra-abdominal hypertension and abdominal compartment syndrome among tertiary Chinese intensive care physicians

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第2期12卷 156-162页

作者： jian-cang ZHOU hong-chen ZHAO Kong-han PAN Qiu-ping XU Department of Critical Care Medicine Sir Run Run Shaw Hospital School of Medicine Zhejiang University Hangzhou 310016 China

This survey was designed to clarify the current understanding and clinical management of intra-abdominal hypertension （IAH）/abdominal compartment syndrome （ACS） among intensive care physicians in tertiary Chinese hospitals. A postal twenty-question questionnaire was sent to 141 physicians in different intensive care units （ICUs）. A total of 108 （76.6%） questionnaires were returned. Among these, three quarters worked in combined medical-surgical ICUs and nearly 80% had primary training in internal or emergency medicine. Average ICU beds, annual admission, ICU length of stay, acute physiology and chronic health evaluation （APACHE）II score, and mortality were 18.2 beds, 764.5 cases, 8.3 d, 19.4, and 21.1%, respectively. Of the respondents, 30.6% never measured intra-abdominal pressure （IAP）. Although the vast majority of the ICUs adopted the exclusively transvesicular method, the over- whelming majority （88.0%） only measured lAP when there was a clinical suspicion of IAH/ACS and only 29.3% measured either often or routinely. Moreover, 84.0% used the wrong priming saline volume while 88.0% zeroed at reference points which were not in consistence with the standard method for lAP monitoring recommended by the World Society of Abdominal Compartment Syndrome. ACS was suspected mainly when there was a distended ab- domen （92%）, worsening oliguria （80%）, and increased ventilatory support requirement （68%）. Common causes for IAH/ACS were ＂third-spacing from massive volume resuscitation in different settings＂（88%）, ＂intra-abdominal bleeding＂, and ＂liver failure with ascites＂（52% for both）. Though 60% respondents would recommend surgical decompression when the lAP exceeded 25 mmHg, accompanied by signs of organ dysfunction, nearly three quarters of re- spondents preferred diuresis and dialysis. A total of 68% of respondents would recommend paracentesis in the treatment for ACS. In conclusion, urgent systematic education is absolutely necessary for most intensive care physician

关键词： Questionnaire Intra-abdominal pressure Intra-abdominal hypertension Decompression laparotomy Abdominal compartment syndrome

Diastereoselective Michael Addition of (4'S)-Ethyl-3-(2',2'-Dimethyl-1',3'- dioxolan-4'-yl) acrylate with Furyl Lithium

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Chinese Chemical Letters 2001年第5期12卷 403-406页

作者： Dong Mei HAN Xun Tian jianG jian hong chen Bin WANG Dong Lu BAI Shanghai Institute of Meteria Medica Shanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031

Michael addition of the chiral alpha,beta -unsaturated ester 2 with furyl lithium proceeded in syn manner with excellent diastereoselectivity. The diastereoselectivity was not affected by the configuration of the doub... 详细信息

关键词： Michael addition configuration determination syn addition.

Evaluation of organ distribution of microcystins in the freshwater phytoplanktivorous fish Hypophthalmichthys molitrix

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第2期8卷 116-120页

作者： ZHANG Hang-jun ZHANG jian-yin hong Ye chen Ying-xu School of Environmental and Resource Sciences Zhejiang University Hangzhou 310028 China

To evaluate the public health risk of exposure to microcystins in fish food in China, the distribution pattem of microcystin-LR and microcystin-RR in various organs （liver, intestine, kidney, muscle and lipid） of the dominant freshwater phytoplanktivorous fish Hypophthalmichthys molitrix in Hangzhou, China＇s Tiesha River was investigated with the method of HPLC-ESI-MS analysis. The distribution of microcystins was different in the fish organs and the major total microcystins （microcystin-LR and microcystin-RR） were present in the intestines （6.49 μg/g fresh weight）, followed by the livers （4.52 μg/g fresh weight） and the muscles （2.86 μg/g fresh weight）. Microcystins were detected in kidneys （1.35 μg/g fresh weight）, but not detected in lipid. The results suggested that the mean daily intake from fish was 0.03 μg/kg body weight which was very close to the recommended WHO tolerable daily intake （TDI） level of 0.04μg/kg body weight per day, and local people were wamed they may have health risk if they consumed fish from the river.

关键词： Microcystin Organ distribution Bioaccumulation Fish Risk

Positions and Spectral Energy Distributions of 41 Star Clusters in M33

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Chinese Journal of Astronomy and Astrophysics 2002年第3期2卷 197-206页

作者： Jun Ma, Xu Zhou, jian-Sheng chen, hong Wu, Zhao-Ji jiang, Sui-jian Xue and Jin ZhuNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

We present accurate positions and multi-color photometry for 41 star clusters detected by Melnick & D'odorico in the nearby spiral galaxy M33 as a part of the BATC Color Survey of the sky in 13 intermediate-band filters from 3800 to 10 000 A. The coordinates of the clusters are found from the HST Guide Star Catalog. By aperture photometry, we obtain the spectral energy distributions of the clusters. Using the relations between the BATC intermediate-band system and UBVRI broadband system, we derive their V magnitudes and B - V colors and find that most of them are blue, which is consistent with previous findings.

关键词： galaxies: individual (M33) - galaxies: evolution - galaxies: star clusters

Malignant glomus tumor of the intestinal ileum with multiorgan metastases:A case report and review of literature

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World Journal of Gastroenterology 2020年第7期26卷 770-776页

作者： jian-hong chen Lin Lin Kui-Liang Liu Hui Su Ling-Ling Wang Peng-Peng Ding Quan Zhou hong Liu Jing Wu Department of Gastroenterology Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China Department of Pathology Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China Department of Gastroenterology Beijing Friendship HospitalCapital Medical UniversityNational Clinical Research Center for Digestive DiseasesBeijing Digestive Disease CenterBeijing Key Laboratory for Precancerous Lesion of Digestive DiseasesBeijing 100050China

BACKGROUND Glomus tumors(GTs)are rare mesenchymal neoplastic lesions derived from cells of the glomus *** rarely occurs in the visceral organs,where there may be few or no glomus bodies,and the majority of GTs are benign,rarely demonstrating aggressive or malignant behavior and histological *** SUMMARY We report a patient with malignant GTs of the intestinal ileum with multiorgan metastases who was admitted due to moderate *** endoscopy revealed a bleeding mass in the intestinal ileum,and the patient underwent segmental ileal resection through laparoscopic *** histopathological and immunohistochemical diagnoses were consistent with malignant *** follow-up showed that the GT had metastasized to multiple organs such as the colon,brain,and possibly the *** This case was characterized by the highest degree of malignancy and by multiorgan metastases,and it was the first case of intestinal GT uncovered by capsule endoscopy.

关键词： Malignant glomus tumor Intestine Metastases Capsule endoscopy Diagnosis Case report

THE STRUCTURE OF ACTIVE SITE AND THE ROLE OF BIVALENT CATION IN FERRITE-FERRIC OXIDE CATALYSTS FOR OXIDATIVE DEHYDROGENATION OF BUTENES

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Chinese Chemical Letters 1992年第11期3卷 925-928页

作者： Shu chen Li Ying YANG jian hong chen Yuan Gen YIN Department of Chemical Engineering Beijing Institute of Chemical Fiber TechnologyBeijing 100029P.R.China

The relations between catalytic activities and compositions of the systems Mg_xZn_(1-x)Fe_2O_4, Co_xZn_(1-x)Fe_2O_4, Co_xMg_(1-x)Fe_2O_4, Cd_xZn_(1-x)Fe_2O_4 and Mg_xZn_(1-x)Fe_2O_4·0.17Fe_2O_3 have been studied by flow differential reactor, XRD, and derivative IR techniques. It has been found that the appropriate normal-inverse spinel combination substantially increases the activity for the title raction. The structure of the active site and the role of the bivalent cation in the title catalyst have been inferred.

关键词： THE STRUCTURE OF ACTIVE SITE AND THE ROLE OF BIVALENT CATION IN FERRITE-FERRIC OXIDE CATALYSTS FOR OXIDATIVE DEHYDROGENATION OF BUTENES SITE XRD