检索结果-南通市图书馆

Microstructures and tensile properties of Mg-Zn-(Gd)-Zr alloys extruded at various temperatures

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第12期36卷 962-970页

作者： Xin Qiu Qiang Yang Kai Guan Fanqiang bu Zhan-Yi Cao Yong-bing Liu Jian Meng Key Laboratory of Automobile Materials of Ministry of Education Department of Materials Science and Engineering Jilin University State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences

The microstructures and tensile properties of Mg-6.0 Zn-0.6 Zr(ZK60) and ZK60 + 1.8 Gd(ZEK620(RE = Gd)) alloys extruded at 290, 305, 320, 340 and360 ℃ were investigated. The results indicate that Gd addition can refine the microstructures of ZK60 alloy and the extrusion parameters such as the extrusion temperature will influence the tensile properties of both as-extruded ZK60 and ZEK620 alloys, although it is much slighter for ZK60 alloy. And the sensitivity is closely related to the textures developed during extrusion. In addition, Gd addition will also clearly improve the tensile strength at room temperature(24 ℃) and particularly at high temperatures(150 and 200 ℃), due to the much finer grains and smaller intermetallic particles. The highest strength is achieved in the as-extruded ZEK620 alloy with extrusion temperature of 320 ℃, with ultimate tensile strength(UTS) and tensile yield strength(TYS) of 405 and375 MPa, respectively, which are improved by approximately 9% and 11% than those of the as-extruded ZK60 alloy which owns the highest strength at extrusion temperature of 290 ℃.

关键词： Rare earth Magnesium Extrusion Microstructure refinement Tensile property

川芎嗪对BMT后小鼠骨髓基质细胞bFGF表达水平的影响

在线全文

学校读者我要写书评

暂无评论

中国实验血液学杂志 2006年第5期14卷 1004-1007页

作者：吴宁周登锋齐洁琳张锡芹步兵刘蒲香王明玉孙汉英刘文励山东省肿瘤防治研究院内一科济南250117 华中科技大学同济医学院附属同济医院血液科武汉430030

本研究探讨川芎嗪对骨髓移植(BMT)后小鼠骨髓基质细胞bFGF表达水平的影响及其促进骨髓造血重建的机制。取健康BALB/c小鼠,随机分为3组:正常组(不做处理),BMT+生理盐水组(简称生理盐水组)和BMT+川芎嗪治疗组(简称川芎嗪组)。生理盐水组... 详细信息

本研究探讨川芎嗪对骨髓移植(BMT)后小鼠骨髓基质细胞bFGF表达水平的影响及其促进骨髓造血重建的机制。取健康BALB/c小鼠,随机分为3组:正常组(不做处理),BMT+生理盐水组(简称生理盐水组)和BMT+川芎嗪治疗组(简称川芎嗪组)。生理盐水组和川芎嗪组分别胃饲生理盐水0.2毫升/只和川芎嗪注射液每次2毫克/只,2次/天,直至处死为止。在BMT后第7、14、21、28天处死小鼠,用RT-PCR和Westernblot方法检测骨髓基质细胞bFGFmRNA及其蛋白表达水平。结果表明:BMT后第7、14、21天川芎嗪组和生理盐水组骨髓基质细胞bFGFmRNA及其蛋白的表达均明显低于正常组(P<0.01或P<0.05),但川芎嗪组明显高于生理盐水组(P<0.01或P<0.05),到第28天,川芎嗪组bFGFmRNA及其蛋白的表达已恢复正常,而生理盐水组仍未恢复正常,两组之间有显著性差异(P<0.01)。结论:川芎嗪可能通过增加bFGF的表达水平而促进骨髓微环境的修复,加速BMT后骨髓的造血重建。

关键词：川芎嗪骨髓移植骨髓基质细胞碱性成纤维细胞生长因子

Synthesis and property of imidazolium oxidative-thermoregulated ionic liquids

在线全文

学校读者我要写书评

暂无评论

Chinese Science bulletin 2014年第34期59卷 4705-4711页

作者： Fengli Yu Chunyu Liu Congxia Xie bing Yuan Tongan bu Shitao Yu State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular Engineering Qingdao University of Science and Technology College of Chemical Engineering Qingdao University of Science and Technology

A series of novel imidazolium oxidative-thermoregulated bifunctional ionic liquids(ILs) have been synthesized by introducing the thermoregulated structural unit into imidazolium cation and using heteropolyanion as the anion of ILs. The structures of these new type of taskspecific ionic liquids(TSILs) are characterized by FT-IR and1 H NMR. The thermostability of ILs is analyzed by thermogravimetry. The thermoregulated properties of ILs in aqueous and organic solvents are mainly *** ILs have the corresponding cloud points(CPs) in aqueous. The effects of IL concentration, polymerization degree, inorganic additives and organic additives on the CP are studied. IL/DMF/n-heptane or n-octane biphasic system has the corresponding critical solution temperature(CST),and has the feature of ‘‘homogeneous at high temperature,heterogeneous at low temperature''. The effects of IL dosage and polymerization degree on the CST are ***/DMF/n-octane thermoregulated biphasic system has been successfully applied for catalytic oxidative desulfurization of model fuels. This study opens up a new way for catalytic oxidation to achieve an integration of homogeneous catalysis and heterogeneous separation.

关键词：催化氧化脱硫离子液体温控咪唑合成杂多阴离子财产结构单元

模拟“低住高练(LoHi)”对游泳运动员运动能力的影响

在线全文

学校读者我要写书评

暂无评论

体育科研 2005年第2期26卷 54-60页

作者：高炳宏步振威罗惠明李之俊崔登荣王道石伟慧马国强沈存上海体育科学研究所上海200030 上海游泳队上海200000 上海体育学院研究生部上海200438

目的:探讨LoHi训练法对运动员运动能力的影响机制,为LoHi训练法在运动实践中的应用提供理论和实践依据。方法:对15名优秀游泳运动员进行2周的LoHi训练,分别于训练前后进行气体代谢、力竭性递增负荷运动能力测试;在训练的整个过程中进行... 详细信息

目的:探讨LoHi训练法对运动员运动能力的影响机制,为LoHi训练法在运动实践中的应用提供理论和实践依据。方法:对15名优秀游泳运动员进行2周的LoHi训练,分别于训练前后进行气体代谢、力竭性递增负荷运动能力测试;在训练的整个过程中进行5次专项有氧能力的测试。结果:2周LoHi训练后,①男运动员VO2max、VO2max/kg、Vemax和O2-plusemax显著提高(P0.05);②力竭性递增负荷运动后,男女运动员运动后的Bla均非常显著的下降(P0.05);同时运动后Bla的下降率表现为逐渐升高的趋势;③力竭性递增负荷运动中,男运动员Wmax提高了12.7%(P0.05);Tmax男子提高17.7%(P<0.05),女子提高7.44%(P<0.05);④男运动员在2周LoHi训练过程中运动成绩呈升高趋势,Bla呈逐渐下降趋势,训练后7d运动成绩最好,Bla却下降51.9%(P<0.01);女运动员在训练过程中运动成绩和Bla均呈下降趋势,训练后7d运动成绩最高,18d下降,但Bla均明显低于训练前(P<0.01)。结论:两周LoHi训练提高了运动员对负荷的适应能力,特别使运动员的一般有氧能力和专项有氧能力得到明显改善;同时,女运动员对缺氧的适应能力明显低于男子,表现出明显的性别差异。

关键词：低住高练游泳运动能力

在线全文

学校读者我要写书评

暂无评论

吉西他滨联合长春瑞滨治疗晚期非小细胞肺癌

临床肿瘤学杂志 2005年第2期10卷 135-136,139页

作者：杨锡贵贾丽雅步兵刘志方田禾周登峰张锡芹山东省肿瘤医院

目的:观察和评价吉西他滨(GEM)联合长春瑞滨(NVB)治疗晚期非小细胞肺癌(NSCLC)的疗效和毒性.方法:GEM 1 000 mg/m2加生理盐水(NS)100 ml,30分钟内滴注,第1、8天;NVB 25 mg/m2加NS 70 ml快速静脉推注,第1、8天.21天为1个周期,至少治疗2... 详细信息

目的:观察和评价吉西他滨(GEM)联合长春瑞滨(NVB)治疗晚期非小细胞肺癌(NSCLC)的疗效和毒性.方法:GEM 1 000 mg/m2加生理盐水(NS)100 ml,30分钟内滴注,第1、8天;NVB 25 mg/m2加NS 70 ml快速静脉推注,第1、8天.21天为1个周期,至少治疗2个周期. 结果:21例NSCLC患者,10例完成2个周期,6例3个周期,5例4个周期,共治疗58个周期.CR 1例,PR 9例,SD 9例,PD 2例,总有效率(CR+PR)为47.6%;初治8例,复治13例,有效率分别为62.5%(5/8例)和38.5%(5/13例)(P＜0.05);鳞癌8例,腺癌13例,有效率分别为62.5%(5/8例)和38.5%(5/13例)(P＜0.05).中位生存期(MST)11.5个月,1年生存率为42.0%.毒性反应主要有白细胞减少、血小板下降、血红蛋白降低;白细胞减少Ⅲ～Ⅳ度者占28.6%(6/21),血小板下降和血红蛋白下降Ⅲ～Ⅳ度分别为14.3%(3/21)和4.8%(1/21).结论:吉西他滨联合长春瑞滨治疗晚期非小细胞肺癌具有较好的疗效,毒性反应可以耐受,特别是老年患者化疗更适宜.

关键词：非小细胞肺癌吉西他滨长春瑞滨化学治疗

A comparison of atmospheric CO_2 concentration GOSAT-based observations and model simulations

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2014年第1期57卷 1393-1402页

作者： LEI LiPing GUAN XianHua ZENG ZhaoCheng ZHANG bing RU Fei bu Ran Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of Sciences

Satellite observations of atmospheric CO2 are able to truly capture the variation of global and regional CO2 *** model simulations based on atmospheric transport models can also assess variations of atmospheric CO2 concentrations in a continuous space and time,which is one of approaches for qualitatively and quantitatively studying the atmospheric transport mechanism and spatio-temporal variation of atmospheric CO2 in a global *** observations and model simulations of CO2 offer us two different approaches to understand the atmospheric ***,the difference between them has not been comprehensively compared and assessed for revealing the global and regional features of atmospheric *** this study,we compared and assessed the spatio-temporal variation of atmospheric CO2 using two datasets of the column-averaged dry air mole fractions of atmospheric CO2(XCO2)in a year from June 2009 to May 2010,respectively from GOSAT retrievals(***)and from Goddard Earth Observing System-Chemistry(GEOS-Chem),which is a global 3-D chemistry transport *** addition to the global comparison,we further compared and analyzed the difference of CO2 between the China land region and the United States(US)land region from two datasets,and demonstrated the reasonability and uncertainty of satellite observations and model *** results show that the XCO2 retrieved from GOSAT is globally lower than GEOS-Chem model simulation by 2 ppm on average,which is close to the validation conclusion for GOSAT by ground *** difference of XCO2 between the two datasets,however,changes with the different *** China land region,the difference is large,from 0.6 to 5.6 ppm,whereas it is 1.6 to 3.7 ppm in the global land region and 1.4 to 2.7 ppm in the US land *** goodness of fit test between the two datasets is 0.81 in the US land region,which is higher than that in the global land region(0.67)and China land region(0.68).The analysis results f

关键词： GOSAT GEOS-Chem atmospheric CO2 concentration inconsistency regional comparison

同方期刊数据库

Investment Environment Assessment and Strategic Policy for Subjects of Federation in Russia

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2019年第5期29卷 887-904页

作者： LI Fujia LIU Qian DONG Suocheng CHENG Hao LI Yu YANG Yang TSYDYPOV Bair BILGAEVAlexey AYURZHANAEV Alexander bu Xiaoyan XIA bing Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100049China Baikal Institute of Nature Management Siberian Branch of RussianAcademy of SciencesUlan-Ude670047Russia

Russia is the largest neighboring country of China. Between the two countries, the resources and industry are complemented, the political mutual trust is at a high level, and trade cooperation has a broad prospect. Choosing the best regions and the best industries to strengthen investment in Russia has a major strategic significance in promoting ‘the Belt and Road Initiative’ and China-Mongolia-Russia Economic Corridor Construction. However, the related researches are extremely limited. The investment environment is unclear, and the investment risk is unknown, which seriously restrict the investment in Russia and the trade cooperation with Russia. Our research team carried out scientific expedition, government visits and scientific research cooperation in Russia for several years, and obtained a great number of first-hand valuable data. According to the analysis on the data and Russian regional policies, this study constructed an investment environment evaluation model(ESI-PRA model), scientific assessed the investment environment for 83 subjects of federation in Russia, in terms of economic, social, infrastructure, policy, resource and accessibility, classified 4 types of investment regions, chose 3 investment priority regions, revealed the investment priority industries, demonstrated the main investment risks, and proposed the strategic policies. The research results provide direct scientific and technological support for strategic decisions, such as investment in Russia, bilateral economic and trade cooperation, and overseas layout of Chinese-funded enterprises. Moreover, it has an important practical and strategic significance for improving overseas geo-strategic interests of China and ensuring the construction of China-Mongolia-Russia Economic Corridor.

关键词： Russia investment environment assessment investment risk strategic policy China-Mongolia-Russia Economic Corridor the Belt and Road Initiative

Effects of drought and heat on the productivity and photosynthetic characteristics of alpine meadow plants on the Qinghai-Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2021年第8期18卷 2079-2093页

作者： MA Li ZHANG Zhong-hua YAO bu-qing MA Zhen HUANG Xiao-tao ZHOU bing-rong XU Man-hou GUO Jing ZHOU Hua-kun Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province Northwest Institute of Plateau BiologyChinese Academy of SciencesXining810008China The Qinghai Institute of Meteorological Science Xining810001China Taiyuan Normal University Jinzhong030619China University of Chinese Academy of Sciences Beijing100049China Qinghai Academy of Social Sciences Xining810000China

Alpine meadow plants,adapted to humid and cold environments,are highly sensitive to environmental factors such as drought and ***,the physiological responses of individual alpine meadow species to drought and heat stress remain *** this study,four representative species of typical functional groups in an alpine meadow of the Qinghai-Tibet Plateau were selected as experimental ***(H1,H2),drought(D1,D2),and combined stress(D1H1,D2H2)treatments were implemented to reveal the biomass and physiological characteristics’response to a constant drought and heat *** results showed that the leaf water content(LWC)of Kobresia humilis and Poa annua increased significantly under heat stress and the compound stress(P<0.05).The effect of a single factor on LWC was greater than that of multiple *** aboveground biomass(AGB)of Oxytropis ochrocephala and Saussurea pulchra decreased significantly under compound stress(P<0.05).The response patterns of the net photosynthetic rate(Pn)and transpiration rate(Tr)of *** and *** under various stress treatments were similar;as were those of *** and *** stomatal conductance(Gs)variation in ***,***,***,and *** were the same under three kinds of stress *** photosynthetic characteristics were more sensitive to the effects of composite than those of single *** drought×heat×species treatment had a significant influence on various indexes except on height(Ht)and the belowground biomass(BGB)(P<0.01).Within a certain range,daytime temperature(DT)promoted the Ht and increased the LWC of the plants,while it inhibited their AGB and intercellular CO2 concentration(Ci).The Pn,Tr,and Gs were more sensitive to soil moisture than to *** results help improve understanding of the physiological response regularity of representative alpine meadow plant species to continuous drought and high temperature conditions at the species level,and pro

关键词： Alpine meadow Drought stress Heat stress Productivity Photosynthetic characteristics

在线全文

学校读者我要写书评

暂无评论

单床方法模拟十床变压吸附提氢

现代化工 2018年第4期38卷 215-219页

作者：卜令兵四川天一科技股份有限公司四川成都610225

采用单床方法模拟了10床5组分变压吸附提H_2,考察了吸附剂配比和均压次数的影响。结果显示,在计算条件下,H_2摩尔分数99.955%,CO含量0.26 mmol/kmol,氢气回收率90%,与工业数据吻合;从吸附结束到顺放结束,负载曲线峰面动态移动,N_2和CO... 详细信息

采用单床方法模拟了10床5组分变压吸附提H_2,考察了吸附剂配比和均压次数的影响。结果显示,在计算条件下,H_2摩尔分数99.955%,CO含量0.26 mmol/kmol,氢气回收率90%,与工业数据吻合;从吸附结束到顺放结束,负载曲线峰面动态移动,N_2和CO负载曲线有"驼峰"形成;逆放和冲洗2个步骤解吸的杂质量最多,再生结束后CH_4残余3.29%,残余比例最小;随着分子筛比例的增加,H_2纯度增加,CO含量降低,进入分子筛层CO_2量增加,分子筛比例70%较为合适;均压次数从2次增加至5次,H_2回收率从83.6%增加至90%,原料气处理能力从1.4 mol/s减小至0.999 mol/s。

关键词：变压吸附吸附解吸氢模拟