检索结果-南通市图书馆

Research and development on transonic compressor of high pressure ratio turbocharger for vehicle internal combustion engines

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

Science china(Technological Sciences) 2010年第7期53卷 1817-1823页

作者： ZHENG XinQian, ZHANG YangJun & YANG MingYang State Key Laboratory of Automotive safety and Energy, Tsinghua University, beijing 100084, china 1. State Key Laboratory of Automotive safety and Energy Tsinghua University Beijing 100084 China

The pressure ratio required for a turbocharger centrifugal compressor increases with internal combustion engine power density. High pressure ratio causes a transonic flow field at the impeller inducer. Transonic flow narrows the stable flow range and de-teriorates stage efficiency. In this work, an advanced high pressure ratio transonic compressor was designed. The experimental results show that the maximum pressure ratio of this turbocharger is about 4.2, the maximum efficiency is above 80% and the stable flow range at the designed rotating speed is up to 34%. A turbocharger with this transonic compressor has been applied to some vehicle research actually, and improved power density by 40%.

关键词： turbocharger internal combustion (IC) engine compressor high pressure ratio transonic

A NEW WAY FOR DERIVING SOLITARY WAVE

在线全文

学校读者我要写书评

暂无评论

china Ocean Engineering 1989年第3期4卷 329-335页

作者： Fu Yuhua Engineer, Structure Eng. Dept, china Offshore Oil Development And Engineering corp., beijing Structure Eng. Dept. China Offshore Oil Development & Engineering Corp. Beijing China China

This paper presents a new way for deriving solitary wave by using variational principle, which not only can be used to derive solitary wave according to Original Mathematical Equations (OME), but also can be used to derive solitary wave according to the Wave Equation (WE) derived from OME. With the same condition of wave height and water depth, WE-solitary wave and OME-solitary wave are compared in this paper.

关键词： OME A NEW WAY FOR DERIVING SOLITARY WAVE

copper Elimination from the Molten Steel by Addition of Hydronitrogens

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 1998年第2期12卷 93-96页

作者： Liansheng Li~(1)) Changxiang Xiang~(1)) Jie Cao~(1)) Shiqi Ii~(1)) Eiji Ichise~(2)) 1)Applied Science School, UST beijing, beijing 100083, china 2) The Kyoto University, Kyoto, Japan Applied Science School UST Beijing Beijing 100083 China Kyoto University Kyoto Japan

A novel method has been proposed to remove copper from molten steel by adding the compounds of hydrogen and nitrogen into the melt at normal pressure. Feasibility experiments were carried out in Mo-wire resistance furnace at 1600℃. The copper content of about 400 g 45 steel were reduced from 0.60% and 0.57% to 0.41% and 0.51% with 3.25g and 1.20 g NH_4Cl respectively, while the copper contents of about 300 g steel melt were reduced from 1.15% and 0.61% to 0.90% and 0.56% with 4.10 g and 2.00 g NH_2coNH_2. These results indicate that the proposed method is very promising to be put into practical and worthwhile of further study.

关键词： molten steel copper removal hydronitrogens

在线全文

学校读者我要写书评

暂无评论

排烟系统法兰填料探讨

施工技术 2011年第S2期40卷 159-161页

作者：宋维新北京城建五建设工程有限公司北京100029

通过对规范规定、材料性能、火灾情形等方面分析,提出法兰填料材料应使用不燃材料的方案。

关键词：排烟系统法兰填料不燃材料难燃材料氧指数

From economic prosperity to ecological sustainability──A theoretical and practical concern of sustainable development in china

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1994年第4期6卷 389-401页

作者： Wang Rusong, Hu DanReseareh Center for Eco-Environmental Sciences,Chinese,ChineseAcademy of Seiences, beijing 100085.china

china. a country with more than 1. 2 billion people, is undergoing a rapid industrializationand urbanization. While brings wealth and hopes to people, the economic prosperity has to pay the priceof the ecological degradation. What kind of dynamics and cybernetics is needed to lead a sustainabledevelopment and ecological health? How to deal with the complicated relationships between social transi-tion , economic growth and environmental change? This article is to present some theoretical and practicalconcerns from the viewpoint of human system ecology with some cases of small towns in the coastal areaof china.

关键词： sustainable development economic prosperity ecological sustainability china

Recombinant expression of rt-PA gene (encoding Reteplase) in gametophytes of the seaweed Laminaria japonica (Laminariales,Phaeophyta)

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2008年第12期51卷 1116-1120页

作者： ZHANG YiChen1,2, JIANG Peng1, GAO JiangTao1,3, LIAO JianMin4, SUN ShiJing4, SHEN ZiLong4 & QIN Song1, 1 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, china 2 college of Chemistry and Life Science, Tianjin Normal University, Tianjin 300387, china 3 Graduate University of Chinese Academy of Sciences, beijing 100049, china 4 Biotechnology Center, china Pharmaceutical University, Nanjing 210009, china Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China college of Chemistry and Life Science Tianjin Normal University Tianjin 300387 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Biotechnology Center China Pharmaceutical University Nanjing 210009 China

The life cycle of seaweed Laminaria japonica involves a generation alternation between diploid sporophyte and haploid gametophte. The expression of foreign genes in sporophte has been proved. In this research, the recombinant expression in gametophyte was investigated by particle bombardment with the rt-PA gene encoding the recombinant human tissue-type plasminogen activator (Reteplase), which is a thrombolytic agent for acute myocardial infarction (AMI). Transgenic gametophytes were selected by their resistance to herbicide phosphiothricin (PPT), and proliferated in an established bubble column photo-bioreactor. According to the results from quantitative ELISA, Southern blotting, and fibrin agarose plate assay (FAPA) for bioactivity, it was showed that the rt-PA gene had been inte-grated into the genome of gametophytes of L. japonica, and the expression product showed the ex-pected bioactivity, implying the proper post-transcript modification in haploid gametophyte.

关键词： Laminaria japonica gametophyte genetic engineering Reteplase rt-PA bioreactor

MgCl_2·6H_2O-BASED ZIRcoNOCENE CATALYST FOR ETHYLENE POLYERIZATION

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 1999年第2期17卷 185-188页

作者： Shi-jing Xiao Hui Yao Ke-quan Peng Institute of Chemistry, Chinese Academy of Sciences, beijing 100080, china Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Several supported zirconocene catalysts were prepared by using MgCl_2·6H_2O as a precursor forproducing an active support. Such catalysts combined with methylaluminoxane (MAO) obtained by reactingMgCl_2·6H_2O with AlMe_3 show good activity for ethylene polymerization similar to that of anhydrousMgCl_2 supported zirconocene catalyst.

关键词： MgCl_2.6H_2O, Supported zirconocene catalyst Ethylene polymerization

Orbital Stability of Solitary Waves of The Long Wave-Short Wave Resonance Equations

在线全文

学校读者我要写书评

暂无评论

communications in Nonlinear Science and Numerical Simulation 1996年第3期1卷 37-42页

作者： Boling GUO Lin CHEN(Institute of Applied Physics and computationalMathemaics, P. O. Box 8009, beijing 100088, china) Institute of Applied Physics- and computational Mathematics P. O. Box 8009 beijing 100088 china

This paper concerns the orbital stability for solitary waves of the long waveshort are resonance equations. By using a different method from [15], applying the abstractresults of Grillakis et al. [8][9] and detailed s... 详细信息

关键词： Solitary wave stability. Long wave-short wave resonance equations

Disscussion of construction Pricing System of Public Projects

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Disscussion of Construction Pricing System of Public Project...