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Islet separation and islet cell culture in vitro from human embryo-pancreas

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World Journal of Gastroenterology 1999年第5期5卷 458-460页

作者： yuan z Wu GY He YS Shao CM zhan Y Kunming Med Coll Dept Histol & Embryol Kunming 650031 Yunnan Province Peoples R China First Affiliated Hosp Kunming Med Coll Dept Nucl Med Kunming 650032 Yunnan Province Peoples R China Kunming Med Coll Dept Biol Kunming 650031 Yunnan Province Peoples R China

INTRODUCTIONDiabetes mellitus is the most common disease and its death rate ranks the 8th in the world. Up to now, its incidence has a tendency to increase[1]. Since disorder of sugar metabolism might result in microvascular degeneration and injury of important human organs, it will endanger human health seriously. In 1969, Younszai first reported the method that could decrease diabetes symptoms by islet tissue transplantation. In 1981, our country began to treat diabetes type Ⅰ by transplanting cultured islet tissues. In our study, we digested the pieces of pancreas with collagenase and made morphological observation on islet cells cultured for 3d, 5d, 7d, 9d and 13d respectively, and the contents of insulin and C-peptide in the supernatant were detected by radioimmunoassay. The experimental model of rabbit diabetes was established, and certain curative effect was achieved in the treatment of experimental diabetes in rats.

关键词： cell culture islet cell islets of langerhans transplantetion pancreas/ embryology

A Lower Bound for the Differences of Powers of Linear Operators

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Acta Mathematica Sinica,English Series 2007年第4期23卷 745-748页

作者： J.MALINEN O.NEVANLINNA V.TURUNEN z.yuan Department of Mathematics Helsinki University of TechnologyP.O.Box 1100 FIN-02015 HUTFinland

Let T be a bounded linear operator in a Banach space, with σ（T）={1}. In 1983, Esterle-Berkani＇ s conjecture was proposed for the decay of differences （I - T） T^n as follows： Eitheror lim inf （n→∞（n＋1）｜｜... 详细信息

关键词： Esterle-Berkani's conjecture Quasi-nilpotent linear operator Differences of powers Decay

PROCOAGULANT EFFECTS OF THROMBOLYTICTHERAPY IN ACUTE MYOCARDIAL INFARCTION

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Chinese Medical Sciences Journal 2002年第1期17卷 36-39页

作者： Wang Y Liu Q zhu J yuan z Ma X Department of Cardiology the First Hospital Xi''an Jiaotong University Xi''an 710061

To examine the procoagulant effects of thrombolytic agent on h emostasis and study the role of hemostatic markers as predictors of clinical outcomes. Methods. In the present study, eighteen patients with acute myocardial in farction(AMI) received 1.5 or 2.0 million U nonspecific urokinase(UK), or 70～80 mg fibrin specific recombinant tissue plasminogen activator(rt PA)and did not use heparin until 8 hours after intravenous injection of the above agents. Eig ht patients with AMI and without thrombolytic therapy were enrolled as controls. Coagulant and thrombolytic activity markers included thrombin antithrombin Ⅲ complex (TAT), D dimer, fibrinogen (Fg), FMPV/Amax. All markers were determined before,immediately,1,2,4 and 8 hours after the administration of thrombolytic a gents respectively. Results. Molecular marker of thrombin generation——TAT showed an activated coa gulant state immediately after thrombolytic therapy. Level of TAT showed no sign ificant changes between every two observed phases in controls. However, level of TAT increased significantly from 4.95±1.75μg/L ( 4.63±1.37μg/L) to 14.71±3 .31μg/L ( 14.25±2.53μg/L) before and immediately after administration of thro mbolytic agents UK(or rt PA). There was significant difference between level of serum TAT of patients with and without thrombolytic therapy (P< 0.05). Patients achieving clinical reperfusion had lower TAT level than those failing in thromb olytic therapy, and higher FMPV/Amax level than controls. D dimer, a surrogate of thrombolytic activity increased markedly and Fg significantly declined afte r thrombolytic therapy(P< 0.05).Conclusions. Thrombin generation occurred in plasma in response to excess fibri nolysis induced by thrombolytic therapy. Both urokinase and rt PA had procoagul ant action. This transient activation of the coagulant system might contribute t o early reocclusion. These data provided the theoretical support for simultaneou s administration of antico

关键词： acute myocardial infarction thrombolysis urokinase rt PA

Computer Implementation of the Passage Arrangement for Plate-Fin Heat Exchangers According to Local Balance Principle

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Journal of Thermal Science 1997年第3期6卷 190-196页

作者： yuan, z.X. Ma, Y.L. Xia, G.P. Tao, W.Q. (School of Energy and Power Engineering, Xi’an Jiaotong University Xi’an Shaanxi 710049, China) School of Energy and Power Engineering Xi’an Jiaotong University Xi’an China

A two-step method for stacking arrangement of passages in multistream plate-fin heat exchanger is proposed. The first step (predict step) is to initialize the arrangement according to a local-balance principle, and the second step (correct step) is to resadust the arrangement according to the results of differential computation of the temperature distribution. The computer implementation process of the local balance principle is described in detail and three examples are illustrated to show the feasibility of this principle. A subroutine program is provided to facilitate the reader to adopt this principle.

关键词： passage arrangement plate-fin heat exchangers local balance principle

Changes in regional religious activities in the last millennium recorded by black carbon in Lake Dalzong,northeastern Tibetan Plateau

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Science China Earth Sciences 2023年第2期66卷 303-315页

作者： Xuyi MA Duo WU yuan LIANG zijie yuan Tao WANG Youmo LI Ngondzin Ngawang Gyatso College of Earth and Environmental Sciences MOE Key Laboratory of Western China’s Environmental SystemsLanzhou UniversityLanzhou730000China Center for Studies of Ethnic Groups in Northwest China of Lanzhou University Lanzhou730000China

The ecological environment of the Tibetan Plateau,known as the“Third Pole of the Earth”,is extremely sensitive and *** rapid societal development,environmental problems on the Tibetan Plateau have become prominent,as it is downwind of the emission sources from densely populated areas in the Middle East and South Asia,and the plateau has become one of the regions significantly affected by transboundary pollutant transmission(including black carbon,BC).The Tibetan Plateau has a long history of life and religious sacrifices,including aromatic plant-burning,which were recorded in the geologic record;therefore,BC can be used as a potential indicator to study the changes in religious *** this study,BC analysis was carried out based on the plausible dating framework tested by the AMS14C and137Cs methods on successive sediment cores from Lake Dalzong,an alpine lake in the Gannan Tibetan Autonomous Prefecture,northeast of the Tibetan *** was found that the BC in the lake sediments mainly accumulated through proximity wet deposition,and its content changes reflected the prevalence of surrounding religious *** study results indicate that the area of Lake Dalzong has experienced three periods of enhanced religious activities in the last millennium:1490-1565 CE(mid-Ming Dynasty),1810-1890 CE(late Qing Dynasty),and 1920 CE to the present(since the founding of the Republic of China),and the increase in religious activities on this centennial time scale is a response to concurrent social *** study is the first to extract information on the variation in religious activities from lake sediments on the Tibetan Plateau,which will help advance the study of the historical context of the Anthropocene on the Tibetan Plateau.

关键词： Tibetan Plateau Lake Dalzong Black carbon Millennium Religious activities

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Thermodynamic analysis of ITSOFC hybrid system

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Thermodynamic analysis of ITSOFC hybrid system

FINITE ELEMENT MODEL AND SIMULATION OF ROTARY FORGING OF A DISC

第九届全国氢能学术会议

作者： z.yuan and Q.z.Lin University of Science and Technology of China,China

＜正＞Solid oxide fuel cell（SOFC） is an energy conversion device that produces electricity directly from fossil fuels by electrochemical ***,which has lower cost and longer duration of life than other style FC,has been getting considerable attention all over the world *** and low temperature solid oxide fuel cells（IT/LT,300-700℃SOFCs） are become the main strain of the world SOFC R＆D now.

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来源： cnki会议评论

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 470-475页

作者： G.Liu, S. J. yuan, z. R. Wang and T. Xie 1) Harbin Institute of Technology, Harbin 150001, China 2) Harbin Huasheng Coorpration, Harbin 150001, China

The rotary forging process of a disc is simulated by 3-D finite element *** motion of the rotary the is described as the combination of a revolution round the machine axis and a spin round the rotary die axis. Therefore, the workpiece can be loaded and unloaded partly and cyclically by the cone surface of the rotary the continuously, according with the practical rotary forging process. From the siumulation rasults, the causes of center-thinning during rotary forging of discs are that the locally loading of rotary die made the workpiece center get high radial and tangential tensile stresses, and then the shortening in axial direction and the elongating in tangential and radial direction occur continuous- ly.

关键词： finite element simulation rotary forging,disc center-thinning

EFFECT OF Ce ON OXIDATION BEHAVIOUR OF Ni_3Al ALLOYS

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Acta Metallurgica Sinica(English Letters) 1997年第1期10卷 74-78页

作者： T.H Xi z.X. yuan and z.S. Yu (Research Institute of Wuhan Iron & Steel (Group) Company, Wuhan 430080, China)(Department of Materials, Wuhan Yejin University of Science and Technology, Wuhan 430081, China)(Department of Materials Physics, Beijing Universi Research Inst of Wuhan Iron and Steel (Group) Co Wuhan China

The effect of Ce on the oxidation behaviour of undoped and B-doped Ni3 Al has been studied. Ce can refine Al2O3 grains produced in the course of oxidation of polycrystalline Ni3Al, accelerate the diffusion of oxygen along Al2O3 grain boundaries,and promote the growth of Al2O3 grains. As a result, the quantity of less-protective NiO decreases. The oxidation resistance of 0.011% Ce-doped alloy is the best of all Ce-doped Ni3Al alloys. Because B is benefitial to the formation of Al2O3 and Ce can refine Al2O3 grains, the oxidation resistance of the alloy containing both B and Ce is the best.

关键词： Ni_3Al Ce oxidation

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爱比礼物更多一点

芭莎珠宝 2019年第6期 114-123页

作者： yuan.z 不详

悄然岁末,满溢爱与祝福的节日如约而至。De Beers戴比尔斯在这个浪漫的冬日,为你表达爱意,纪念生命中每一个弥足珍贵的时刻。比礼物更多一点,比爱更多一分。

关键词：如约而至满溢礼物