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Synthesis of aza-naphthindolizinedione derivatives

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Chinese Chemical Letters 2008年第5期19卷 533-536页

作者： De Qing Shen yu cheng lin Kun An Xian Zhang Bu School of Pharmaceutical Sciences Sun Yat-sen University Guangzhou 510080 China

A series of aza-naphthindolizinedione derivatives, such as indolizinoquinolinedione derivatives, indolizinophthalazinedione derivatives and indolizinoquinoxalinedione derivatives were designed and synthesized. The syn... 详细信息

关键词： Synthesis Indolizinoquinolinedione Indolizinophthalazinedione Indolizinoquinoxalinedione

Influence of DC Current on Corrosion Behaviour of Copper–Aluminium Composite Plates

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1142-1152页

作者： yu-lin cheng Xiao-Jiao Zuo Xiao-Guang yuan Hong-Jun Huang Yi-Fan Zhang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

In this study, neutral salt spray accelerated corrosion test of copper–aluminium composite under 0–125 A DC current was carried out under 5% concentration. The effect of corrosion behaviour on copper–aluminium composite by DC current was carried out by a scanning electron microscope(SEM) with energy-dispersive spectroscopy(EDS), X-ray diffraction(XRD) patterns, X-ray photoelectron spectroscopy(XPS), weight-loss method and electrochemical analysis. The results show that the current can accelerate the corrosion rate. Meanwhile, the current temperature effect can reduce the corrosion rate. The current caused directional migration of ions resulting in different corrosion products on positive and negative poles of specimen, and the corrosion degree on the positive pole was more serious. The galvanic corrosion mechanism at the copper–aluminium interface is different from the pitting corrosion mechanism far away from the interface, and the latter is more affected by DC current.

关键词： Copper–aluminium composite Corrosion DC current Ionic migration Temperature effect

Chinese sunspot drawings and their digitization–(Ⅱ)accuracy analysis for digitized sunspot hand-drawing records of yunnan Observatories

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Research in Astronomy and Astrophysics 2020年第4期20卷 156-162页

作者： Yang Peng Xiao-yu Luo Shu-Guang Zeng lin-Hua Deng Sheng Zheng Gang-Hua lin yu-lin cheng Jin-Ping Tao Yong-Li Feng College of Science China Three Gorges UniversityYichang 443002China yunnan Observatories Chinese Academy of SciencesKunming 650216China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Chongqing University of Arts and Sciences Chongqing 402160China

Sunspots are the most striking and easily observed magnetic structures of the Sun,and statistical analysis of solar historical data could reveal a wealth of information on the long-term variation of solar activity *** hand-drawn sunspot records of yunnan Observatories,Chinese Academy of Sciences have been accumulating for more than 60 years,and nearly 16000 images have been *** the future,the observation mode of recording sunspots by hand-drawing will be replaced inevitably by digital images observed either at ground or in *** connect the hand-drawn sunspot data and the purely digital sunspot data in future,it is necessary to analyze the systematic errors of the data which are observed by the two observation modes in the period of *** this paper,we choose 268 round sunspots(Htype in modified Zurich sunspot classification)from the drawing of yunnan Observatories to compare their positions and areas with the CCD observations made by Helioseismic and Magnetic Imager(HMI)on board Solar Dynamic Observatory(SDO)and Global Oscillation Network Group(GONG).We find that the latitude and longitude accuracy of hand-drawn sunspot are within-0.127 and 2.29 degree respectively,and the area accuracy is about 16.36 sunspot unit(μHem).Systematic errors apparently decrease with large sunspot.

关键词： sunspots methods:data analysis techniques:image processing

Weak Merging Scenario of CLASH Cluster A209

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Research in Astronomy and Astrophysics 2024年第4期24卷 174-182页

作者： Wen-cheng Feng Heng yu Hai-Hui Zhao Xiao-Lan Hou Shu-Mei Jia cheng-Kui Li yu-lin cheng Paolo Tozzi Ming Sun Yong Chen Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Astronomy Beijing Normal UniversityBeijing 100875China Department of Astronomy Yunnan UniversityKunming 650091China INAF—Osservatorio Astrofisico di Arcetri Largo E.Fermi50122 FirenzeItaly Department of Astronomy University of VirginiaP.O.Box 400325CharlottesvilleVA 22904-4325USA

We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton *** obtain detailed temperature,pressure,and entropy maps with the contour binning method,and find a hot region in the NW *** X-ray brightness residual map and corresponding temperature profiles reveal a possible shock front in the NW direction and a cold front feature in the SE *** with the galaxy luminosity density map we propose a weak merger scenario.A young sub-cluster passing from the SE to NW direction could explain the optical subpeak,the intracluster medium temperature map,the X-ray surface brightness excess,and the X-ray peak offset together.

关键词： X rays:galaxies:clusters galaxies:clusters:intracluster medium galaxies:clusters:Abell 209

Corrosion behavior of Cu/Al casting-rolled clad plates in different alkaline solution

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China Foundry 2021年第5期18卷 513-520页

作者： Yi-fan Zhang Xiao-guang yuan Xiao-jiao Zuo Hong-jun Huang yu-lin cheng School of Materials Science and Engineering Shenyang University of technologyShenyang 110870China

The effect of pH value and different kinds of anions on the corrosion behavior of Cu/Al casting-rolled clad plates in the alkaline solution was evaluated by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),X-ray diffraction(XRD),weight loss analysis,3D confocal laser scanning microscopy(CLSM)and electrochemical *** show the corrosion mainly occurs on the aluminum *** corrosion resistance of the Cu/Al decreases as the pH value *** pH≥12,the dissolution of the film layer is faster than the passivation *** addition of Cl^(-)ions reduces the corrosion resistance of the Cu/Al clad plates,which leads to pitting *** higher the concentration of Cl^(-)ions,the more prone the pitting to *** addition of SO_(4)^(2-)ions causes the denudation of the *** corrosion resistance of the Cu/Al is better in the alkaline solution containing NO_(3)^(-)ions than that in the solution containing Cl^(-)ions or SO_(4)^(2-)*** adding SO_(4)^(2-),NO^(3)^(-)and Cl^(-)to the pure alkaline solution,the corrosion resistance of the Cu/Al clad plates decreases.

关键词： Cu/Al clad plates alkaline solution pH anions electrochemistry casting-rolled

Regression of East Tethys resulted in a center of biodiversity: A study of Mysmenidae spiders from the Gaoligong Mountains, China

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Zoological Research 2023年第4期44卷 737-738页

作者： Qiu-Qiu Zhang Ya Li yu-cheng lin Shu-Qiang Li Zhi-yuan Yao Xiao-Qing Zhang Key Laboratory of Bio-resources and Eco-environment(Ministry of Education) College of Life SciencesSichuan UniversityChengduSichuan 610064China Sichuan Key Laboratory for Conservation Biology of Endangered Wildlife Sichuan UniversityChengduSichuan 610064China Institute of Zoology Chinese Academy of SciencesBeijing 100101China College of Life Science Shenyang Normal UniversityShenyangLiaoning 110034China

DEAR EDITOR,This research involved the study of 31 species from the spider family Mysmenidae Petrunkevitch,1928,found in the Gaoligong Mountains of China,including one new genus and 13 new *** results suggested that regression of East Tethys contributed to the appearance of a center of *** Tethys,a classical and hot topic in *** has undergone a succession of significant geodynamic transformations,transitioning from an ancient ocean to the current Alpine-Himalayan orogenic ***,the East Tethys,serving as an invaluable lens through which to study continental geology and geodynamics,has played a pivotal role in triggering the major geological reconstructions of the entire Tethys(Pan et al.,1997).

关键词： Tethys East Mountains

A Genetic Algorithm Based Approach for Campus Equipment Management System in Cloud Server

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Journal of Electronic Science and Technology 2013年第2期11卷 187-191页

作者： yu-cheng lin Department of Multimedia and Mobile Commerce at Kainan University

In this paper, we proposed a campus equipment ubiquitous-management system which is based on a genetic algorithm approach in cloud server. The system uses radio frequency identification （RFID） to monitor the status of equipment in real time, and uses wire or wireless network to send real-time situation to display on manager＇s PC or PDA. In addition, the system will also synchronize with database to record and reserve message. Furthermore, the status will display not only to a single manager but also a number of managers. In order to increase efficiency between graphical user interface （GUI） and database, the system adopts SqlDependency object of *** so that any changed situation of the database could be known immediately and synchronized with manager＇s PC or PDA. Because the problem of the equipment utilization is an NP-complete （non-deterministic polynomial） problem, we apply genetic algorithm to enhance the efficiency of finding optimum solution for equipment utilization. We assign constraints into the system, and the system will post back the optimum solution simultaneously on the screen. As a consequence, we compare our genetic algorithm based approach （GA） with the simulated annealing based approach （SA） for maximizing the equipment utilization. Experimental result shows that our GA approach achieves an average 79.66% improvement in equipment utilization in an acceptable run time.

关键词： Campus equipment cloud server genetic algorithm RFID ubiquitous-managementsystem.

A better parameter in predicting insulin resistance:Obesity plus elevated alanine aminotransferase

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World Journal of Gastroenterology 2009年第44期15卷 5598-5603页

作者： Ping-Hao then Jong-Dar Chen yu-cheng lin Department of family practice Lo-Sheng Sanatorium Department of Health Taipei County 242 Taiwan China Department of family medicine Shin Kong Wu Ho-Su Memorial Hospital Taipei 111 Taiwan China Department of Occupational Medicine Tao- Yuan General Hospital Department of Health Tao-Yuan 330 Taiwan China

AIM:To investigate the association of obesity and elevated alanine aminotransferase with insulin resistance and compare these factors with metabolic syndrome. METHODS:We enrolled a total of 1308 male workers aged from 22 to 63 *** was extracted from the workers'periodic health check-ups in *** cases were from the community of northern Taiwan. This was a cross-sectional observational study from July to September in *** grouped all cases into four groups,based on the quartile of homeostasis model *** top fourth quartile group was defined as the group with insulin *** performed multivariate logistic regression analysis for the odds ratio of the risk factors for insulin resistance. RESULTS:Compared with metabolic syndrome,the coexistence of both factors had a 4.3-fold(95%CI: 2.7-6.8)increased risk,which was more than metabolic syndrome with a 3.6-fold(95%CI:2.6-5.0)increased *** two factors had a synergistic *** synergistic index of obesity and elevated alanine aminotransferase(ALT)was 2.1(95%CI:1.01-4.3).CONCLUSION:Obesity and elevated ALT are associatedwith insulin *** effects are synergistic. Coexistence of them is better than metabolic syndrome in predicting insulin resistance.

关键词： Alanine aminotransferase Transaminase Overweight Obesity Insulin resistance

Sonographic fatty liver and hepatitis B virus carrier status: Synergistic effect on liver damage in Taiwan Residents adults

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World Journal of Gastroenterology 2007年第12期13卷 1805-1810页

作者： yu-cheng lin Shu-Tin Hsiao Jong-Dar Chen Department of Family Medicine and Center for Environmental and Occupational Medicine Shin Kong Wu Ho-Su Memorial Hospital Taipei Taiwan China Institute of Occupational Medicine Industrial Hygiene National Taiwan University Taipei Taiwan China

AIM: To examine the epidemiology of hepatitis B virus carrier status (HBVC) and sonographic fatty liver (SFL) in Taiwan Residents adults, and to evaluate their possible interaction in inducing liver damage (LD). From an epidemiological viewpoint, we analyzed previous studies which indicated that fatty liver sensitizes host immune response to HBV infection and enhances liver ***: A cross-sectional retrospective analysis of health records including medical history, physical examination, abdominal sonogram, blood biochemistry and hepatic virological tests. We utilized the Student's t-test, chi-square, multivariate logistic regression and synergy index to assess risks for ***: Among a total of 5406 Taiwan Residents adults (mean age 46.2 years, 51.5% males), the prevalence of LD, HBVC and SFL were 12.3%, 15.1% and 33.4%, respectively; 5.1% of participants had SFL plus HBVC. Multivariate logistic regression analysis demonstrated that male gender (odds ratio (OR) = 2.8, 95% confidence interval (CI): 2.3-3.5), overweight state (OR = 1.6, 95% CI: 1.3-2.0), HBVC (OR = 2.5, 95% CI: 2.0-3.1) and SFL (OR = 4.2, 95% CI: 2.2-5.3) were independently associated with LD. Synergism analysis showed that the adjusted OR for LD in adults with HBVC-alone was 3.3 (95% CI: 2.4-4.6), SFL-alone, 4.7 (95% CI: 3.7-6.1) and combined HBVC and SFL, 9.5 (95% CI: 6.8-13.3); the synergy index was 1.4 (95% CI: 1.001-2.0).CONCLUSION: In Taiwan Residents adults, SFL plus HBVC have a significant synergistic association with LD.

关键词： Fatty liver Hepatitis B virus Sonography Synergism