检索结果-南通市图书馆

Effect of the Small Reaustenized Grains on the Mechanical Properties of a HSLA Steel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2011年第S1期18卷 312-315页

作者： ZHAO Lian-yu 1,2,WEI Yan 1,SHAN Yi-yin 1,YANG Ke 1 (1.Institute of Metal Research,chinese academy of sciences,Shenyang 110016,Liaoning,china 2.graduate school of chinese academy of sciences,beijing 100049,china) chinese Acad Sci Inst Met Res Shenyang 110016 Liaoning Peoples R China chinese Acad Sci Grad Sch Beijing 100049 Peoples R China

Grain refinement improves not only strength but also *** reaustenized grains were discovered to form along the grain boundaries and lath boundaries in an as rolled high-strength low-alloy (HSLA) steel when heated to double phase *** number and size of the small reaustenized grains were revealed to depend mainly on temperature in the range of 700 to 760℃.These small reaustenized grains were deduced to form by consuming *** mechanical property tests showed that they resulted in slight changes to tensile ***,the sample heated at 740℃ produced a peak Charpy V-notch (CVN) impact energy of 248J when tested at-30℃.Fractography showed that the facture surface of the 740℃ heated impact sample exhibited the smallest brittle zone away from the notch root and a large dimple zone lay ahead of the notch tip,which demonstrated the highest toughness.

关键词： high-strength low-alloy steel reaustenization grain refinement tensile property

Urban Water Supply Industry Marketization of china in View of Public Water Service and Water Resource Management

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Population,Resources and Environment 2010年第2期8卷 55-60页

作者： Wang Yining 1,2 1.Institute of Geographic Science and Natural Resources Research,CAS,beijing 100101,china 2.graduate school of the chinese academy of sciences,beijing 100049,china Institute of Geographic Science and Natural Resources Research CAS Beijing 100101 China graduate school of the chinese academy of sciences Beijing 100049 China

Started with the discussions on the value orientation of urban water supply industry marketization,the article points out that the current urban water supply industry marketization reform is inconsistent with the goal of public water service equalization to some *** article also analyzes the problems emerged in urban water supply industry marketization reform and various rea-sons in view of efficiency and *** efficiency and fairness oriented management model is built in this article to illustrate how the government should conciliate interests of various communities involved in the process of marketization reform of the urban water supply industry so as to actualize the coordination of efficiency and *** the end,an assumption on urban water price is put forward to help achieve the public water service equalization.

关键词：城市供水行业市场化改革水资源管理中国公共服务行业改革管理模式供水价格

A Novel Polymer Electrolyte Using In-situ Quanternization for All Solid-state Dye-sensitized Solar Cell

在线全文

学校读者我要写书评

暂无评论

复旦学报（自然科学版） 2007年第5期46卷 658-659页

作者： Wanchun Xiang1,2, Xiong Yin1,2, Xurui Xiao1, Yuan Lin1, Shibi Fang1(1.Key Laboratory of Photochemistry, Institute of Chemistry, chinese academy of sciences, beijing 100080, china 2.graduate school of chinese academy of sciences, beijing 100049, china) Institute of Chenmistry Chinese Academy of Science Key Laboratory of Photochemistry Chinese Academy of Science Beijing 100080

1 Introduction Dye-sensitized solar cells (DSSCs) with a mesoporous network of interconnected TiO2 nanocrystals have attracted wide-spread scientific and technological interest over the past decades due to its low cost and high energy conversion efficiency. Meantime, it also has been considered as potential alternative to conventional photovoltaic devices. In 2001, Gratzel group constructed such kind of DSSC with the conversion efficiency of more than 11%[1]. But this system uses liquid electrolyte with...

关键词： in-situ quanternization reaction latent cross-linking precursor all solid-state electrolyte dye-sensitized solar cell

Effects of Spatial Aggregation on Forest Landscape Model Simulation in Northeastern china

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2009年第3期15卷 178-186页

作者：周宇飞贺红士布仁仓金龙如李秀珍 Institute of Applied Ecology Chinese Academy of Sciences graduate school of chinese academy of sciences school of Natural Resources University of Missouri-Columbia

Issues of scale and aggregation become important when large range of space and time scales is considered in landscape ***,identifying appropriate levels of aggregation to accurately represent the processes and components of ecological systems is challenging.A raster-based spatially explicit forest landscape model,LANDIS,was used to study the effects of spatial aggregation on simulated spatial pattern and ecological process in Youhao Forest Bureau of the Small Khingan Mountain in Northeastern *** model was tested over 500 simulation years with systematically increased levels of spatial *** results show that spatial aggregation significantly influences the simulation of fire disturbance,species abundance,and spatial *** fire regime was relatively insensitive to grain size between 30.m and 270.m in the *** aggregation from 300.m to 480.m dramatically decreased fire return interval(FRI) and increased mean fire ***,species abundance and its aggregation index(AI) remained higher level over simulation years at the fine-grained level of spatial aggregation than at coarser *** addition,the simulated forest dynamics was more realistic at finer *** results suggest that appropriate levels of spatial aggregation for the model should not be larger than 270m.

关键词：空间聚集森林景观模型仿真东北中国模拟测试物种丰富度空间分布格局

在线全文

学校读者我要写书评

暂无评论

解决度量-验证时间差的一种差值证明方法

通信学报 2009年第S1期30卷 43-50页

作者：张谦贺也平孟策中国科学院软件研究所北京100190 中国科学院研究生院北京100049

度量-验证时间差问题是现有远程证明方法中的一个重要问题。它是因为现有方法中的加载时度量机制缺乏对系统状态变化的察觉和表达能力导致其无法表达当前状态。针对可信虚拟域中的虚拟环境证明提出一种方法在原有的加载时度量的基础上... 详细信息

度量-验证时间差问题是现有远程证明方法中的一个重要问题。它是因为现有方法中的加载时度量机制缺乏对系统状态变化的察觉和表达能力导致其无法表达当前状态。针对可信虚拟域中的虚拟环境证明提出一种方法在原有的加载时度量的基础上补充了卸载时度量,使得更改后的度量机制可以察觉并表达系统中对象的存活状态,即使用加载度量和卸载度量的差值来表达系统的当前状态,进而解决度量-验证时间差问题。

关键词：度量-验证时间差问题卸载时度量 Merkle散列树可信虚拟域差值证明方法

The Carbon and Oxygen Isotopic Compositions:Implications for the Sources and Types of Uranium Deposits in South china

在线全文

学校读者我要写书评

暂无评论

矿物学报 2011年第S1期31卷 277-277页

作者： LUO Jin-cheng1,2(1.State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,chinese academy of sciences Guiyang,Guizhou 550002,china 2.graduate school,chinese academy of sciences,beijing 100049,china)

Uranium ore is an essential material in the preparation of nuclear fuel for civilian and military *** deposits are also important sources of energy for countries which depend heavily on nuclear power(***).

关键词： The Carbon and Oxygen Isotopic Compositions

Preparation and Characterization of Porous Spherical LiFePO_4/C by Spray Drying and Carbothermal Method

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2007年第B12期22卷 853-855页

作者：于锋张敬杰 Technical Institute of Physics and Chemistry Chinese Academy of Sciences graduate school of the chinese academy of sciences Beijing 100049China

The porous spherical LiFePO4/C powders were prepared by spray drying and carbothermal method （SDCTM）. Cheaper trivalent iron ion was used as the precursor. The pure olivine phase can be prepared with the spray drying and subsequent heat-treatment. The average particle size is around 10μm, and the value of porosity is 63.04%. The results indicate that the initial discharge capacity decreases with increasing charge/ discharge rate and reduces from 138.8 mAh · g^-1 at C/20 rate to 98.3 mAh ·g^-1 at 2C rate, while the polarization between the charge and discharge plateaux is enlarged from 53 mv to 347 mv. However, the average discharge efficiency is up to 99.5% at 2C rate compared to 80.6% at C/20 rate from the second cycle.

关键词： LiFePO4 spherical porosity discharge efficiency spray drying and carbothermal method (SDCTM)

在线全文

学校读者我要写书评

暂无评论

西双版纳三种树木树干呼吸日变化特征

山地学报 2006年第3期24卷 268-276页

作者：严玉平沙丽清曹敏中国科学院西双版纳热带植物园中国科学院西双版纳热带植物园云南昆明650223 中国科学院研究生院北京100039

采用气室-红外气体分析法（IRGA）原位监测西双版纳热带季节雨林优势树种番龙眼（Pom etia tom entosa）和玉蕊（Barringtonia macrostachya）（雨季）,以及人工种植的经济树种三叶橡胶（Hevea brasiliensis）（干季、雨季）树干呼吸的... 详细信息

采用气室-红外气体分析法（IRGA）原位监测西双版纳热带季节雨林优势树种番龙眼（Pom etia tom entosa）和玉蕊（Barringtonia macrostachya）（雨季）,以及人工种植的经济树种三叶橡胶（Hevea brasiliensis）（干季、雨季）树干呼吸的日变化,同时监测了林内空气和1 cm深树干温度。结果表明,三者树干呼吸雨季呈双峰模式,三者首个呼吸高峰都在15:00前后,番龙眼和玉蕊第二个呼吸高峰在凌晨1:00前后,三叶橡胶在凌晨5:00前后。干季三叶橡胶树干呼吸为单峰模式,呼吸高峰在19:00前后,午后出现明显的呼吸下降现象。番龙眼和玉蕊雨季树干呼吸速率在1.8143.167μmol/（m2.s）之间,三叶橡胶在8.82410.364μmol/（m2.s）之间,显著高于同时期的番龙眼和玉蕊,三叶橡胶干季在3.4244.110μmol/（m2.s）之间,显著比雨季小。三者Q10在1.602.58之间,三种树的平均Q10为1.77。

关键词：热带树种树干呼吸 Q10 日变化

一株非PSP产毒的亚历山大藻对黑褐新糠虾的急性和慢性毒性影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

水产学报 2008年第1期32卷 111-116页

作者：张彬颜天周名江中国科学院海洋研究所海洋生态与环境科学重点实验室中国科学院海洋研究所海洋生态与环境科学重点实验室山东青岛266071 中国科学院研究生院北京100049

报道了一株非PSP产毒的相关亚历山大藻(Alexandrium affine,株AC-1)对甲壳类生物黑褐新糠虾(Neomysis awatschensis)的存活、生长及种群繁殖的研究结果。通过研究发现,该藻对黑褐新糠虾有急性致死作用,96 h LC50为5 000 ***-1。研究该... 详细信息

报道了一株非PSP产毒的相关亚历山大藻(Alexandrium affine,株AC-1)对甲壳类生物黑褐新糠虾(Neomysis awatschensis)的存活、生长及种群繁殖的研究结果。通过研究发现,该藻对黑褐新糠虾有急性致死作用,96 h LC50为5 000 ***-1。研究该藻各组分:藻液、藻细胞重悬液、藻细胞培养过滤液、内容物对糠虾存活的影响时,发现只有藻液和藻细胞重悬液显著降低了糠虾存活率,过滤液和内容物也有影响,但不显著,表明相关亚历山大藻活体藻细胞的毒性最强。通过对糠虾63 d的慢性毒性实验研究,发现在密度为50 ***-1藻液中,糠虾的繁殖就受到了不利影响。试验进行到63 d结束时,糠虾日最高产虾数、总产幼虾数、总产虾天数都明显减少,初次产虾时间推迟,繁殖中断增加。且该藻对黑褐新糠虾亲虾的存活、生长也有一定的影响,糠虾亲虾的存活率为对照的71%,而体长和体重分别为对照组的87.3%和97.8%,但差异尚不显著(P>0.05)。可见,相关亚历山大藻(AC-1)虽然不产生PSP毒素,但也能对甲壳类生物的种群数量和资源补充产生不利影响。

关键词：相关亚历山大藻黑褐新糠虾存活生长种群繁殖