检索结果-南通市图书馆

Prüfer Sheaves and Generic Sheaves Over the Weighted Projective Lines and Elliptic Curves

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第5期33卷 705-724页

作者： jian min chen Jin Jing chen Ya Nan LIN School of Mathematical Sciences Xiamen University Xiamen 361005 P. R. China

In the present paper, we introduce the concepts of Prüfer sheaves and adic sheaves over a weighted projective line of genus one or an elliptic curve, show that Prüfer sheaves and adic sheaves can characterize the category of coherent sheaves. Moreover, we describe the relationship between Prüfer sheaves and generic sheaves, and provide two methods to construct generic sheaves by using coherent sheaves and Prüfer sheaves.

关键词： Weighted projective line elliptic curve quasi-coherent sheaf pure-injective object

On Connected Components of Skew Group Algebras

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第5期39卷 799-813页

作者： jian min chen Qiang DONG Ya Nan LIN School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

Let A be a basic connected finite dimensional associative algebra over an algebraically closed field k and G be a cyclic *** is a quiver QGwith relationsρG such that the skew group algebras A[G]is Morita equivalent to the quotient algebra of path algebra kQGmodulo ideal(ρG).Generally,the quiver QGis not *** this paper we develop a method to determine the number of connect components of ***,we introduce the notion of weight for underlying quiver of A such that A is G-graded and determine the connect components of smash product A#kG*.

关键词： Smash product skew group algebra n-translation algebra path algebra connected component

On Tubular Tilting Objects in the Stable Category of Vector Bundles

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2019年第4期35卷 494-512页

作者： jian min chen Ya Nan LIN Shi Quan RUAN School of Mathematical Sciences Xiamen University

The present paper focuses on the study of the stable category of vector bundles for the weighted projective lines of weight triple. We find some important triangles in this category and use them to construct tilting o... 详细信息

关键词： Tilting sheaf weighted projective line stable category cluster category tubular algebra

Flavonoid triglycosides from the seeds of Camellia oleifera Abel

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第11期19卷 1315-1318页

作者： Li Chun Du Bei Li Wu jian min chen Department of Environmental Science ＆ Engineering Fudan University Shanghai 200433 China

Two flavonoid triglycosides, kaempferol 3-O-{ β-D-glucopyranosyl-（1→2）-[α-L-rhamnopyranosyl-（1→ 6）]-β-D-glucopyranoside} （1） and kaempferol 3-O-{ β-D-xylopyranosyl-（1 → 2）-[α-L-rhamnopyranosyl-（1→6）]-β-D-glucopyranoside } （2）, were isolated from the seed of Camellia oleifera Abel. The absolute configuration of compound 1 was established on the basis of its X-ray analysis. Their cytotoxic activities and anti-HIV-RT activities were evaluated.

关键词： Flavonoid triglycosides Camellia oleifera Abel Cytotoxic activity

Metallographic sample prepared by ion beam etching

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第Z1期14卷 282-285页

作者： XU Xiang-yang ZHANG Kun HAN jian-min chen Guang-nan Institute of Materials Science & Engineering Beijing Jiaotong University Beijing 100044 China Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Institute of Materials Science & Engineering Beijing Jiaotong University Beijing 100044 China

Ion beam etching technique was used to reveal the metallograhpic microstructure and interface morphology of electroplating chromium coating, in particular, whose substrate surface layer was treated in advance by laser quenching. Chemical etchings were also conducted for comparison. The reveal microstructures were observed and analyzed by scanning electron microscopy. The results show that ion beam etching can reveal well the whole microstructures of composite coating-substrate materials.

关键词： ion beam etching metallography microstructure electroplating chromium

NUMERICAL AND EXPERIMENTAL RESEARCH ON CURRENT GENERATION IN DEEPWATER OFFSHORE BASIN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第5期19卷 551-558页

作者： LU Hai-ning YANG jian-min PENG Tao chen Gang State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai 200030

During the design and construction of the deepwater offshore basin, its current generation system is considered to be one of the key technologies. In this article, the state-of-the-art deepwater offshore basin at Shanghai Jiaotong University was examined as a case study. Different 3-D numerical models of the current generation system were developed and calculated. The uniformity of flow field in the basin, such as horizontal and vertical current velocity profiles, were calculated in detail. Besides, a 1 ： 10 scaled model test was also carried out. The current velocities at different locations in the basin were measured and compared with the calculated results. It is concluded that satisfactory agreement can be resulted between the numerical simulation and model test. In addition, it is suggested that transition sections and turning vanes need to be set in inflow and outflow culverts to improve the uniformity of flow field in the basin. And the hydraulic performance of the deepwater current generation system can meet the requirements of model tests in deep water.

关键词： current generation system deepwater offshore basin ocean engineering model test

Will auctioning promote the renewable energy generation in China?

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2022年第1期13卷 107-117页

作者： Er-Dong ZHAO Jue-Chi SONG jian-min chen Li-Wei LIU ming-Song chen School of Management and Economics Beijing Institute of TechnologyBeijing 100081China School of Economics&Management North China Electric Power UniversityBeijing 102206China International Business School University of International Business and EconomicsBeijing 100029China School of Arts and Sciences Tufts UniversityMassachusetts 02155USA

Renewable energy generation,as part of the global effort to mitigate climate change,will play a central role in reducing greenhouse gas emissions and achieving China's goal of carbon emissions peak before 2030 and carbon neutral before ***,the impact of carbon quota auctions on renewable energy generation has not been sufficiently *** main purpose of this study is to investigate whether China can rely on quota auctions to increase renewable energy generation in the short term,and to demonstrate which is more effective in promoting renewable energy development,policy enforcement or auction constraints?The improved neo-trans-log production model,the multiobjective linear programming model and the dispatch heuristic were used to predict additional emission reduction cost,optimized power mix with different auctioning rates,with economic development,technological progress and the unique characteristics of China's power generation industry being taken into *** results show that the auctioning rate will have little influence on the optimized energy production structure,especially on the share of renewable energy resources;when the total on-grid electricity generation ranges from 7625 to 7926 billion kW h and the auctioning rate ranges from 0% to 5%,policy enforcement will influence the generation of renewable energy to a greater extent than auctioning in the near future.

关键词： Emission trading scheme Power generation industry Renewable energy resources Auctioning China cap and trade Renewable energy policy in China China's carbon emission trading market

THREE-DIMENSIONAL NUMERICAL SIMULATION OF AERATED FLOWS DOWNSTREAM SUDDEN FALL AERATOR EXPANSION-IN A TUNNEL

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2011年第1期23卷 71-80页

作者： ZHANG jian-min chen jian-gang XU Wei-lin WANG Yu-rong LI Gui-ji State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065China

Air entrainment is known to be one of efficient and inexpensive methods to prevent cavitation damages in hydropower *** shape of sudden expansion-fall is used as a common device for mitigating cavitation *** complex flow patterns with cavitation are numerically simulated by using the realizable k-εturbulence model and the air-water mixture *** calculated results are compared well with the experimental results as well as those obtained with the k-εturbulence model with the Volume Of Fluid（VOF）*** calculated results agree well with the experimental data for the aeration cavity and wall ***,the air concentration near sidewall is simulated by a mixture *** is found that the mixture turbulence model is superior to the VOF turbulence model.

关键词： sudden expansion-fall aerator RNG k-εturbulence model realizable k-εturbulence model Volume Of Fluid (VOF)method air-water Mixture turbulence model numerical simulation

In Situ Controllable Growth of Cu_2SnS_3 Film as Low-Cost Counter Electrodes for Dye-Sensitized Solar Cells

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 580-583页

作者： Wei Xu Xin jiang jian-min chen Rui-Qin Tan Wei-Jie Song Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo Key Laboratory of Silicon and Organic Thin Film Optoelectronic Technologies State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Faculty of Information Science and Engineering Ningbo University

Morphology-controllable Cu2SnS3 thin films on solvothermal process and used in dye-sensitized solar cells as Mo-glass were prepared via a facile in situ one-step counter electrodes. The effects of different solvents on the morphology of films were investigated. DSC based on the porous net-like Cu2SnS3 thin film as counter electrodes showed a power conversion efficiency of 2.30%, which was improved to 3.35% after annealing.

关键词： Cu2SnS3 Thin films Counter electrodes Solar cells Power conversion efficiency