检索结果-南通市图书馆

Two New Coordination Complexes Based on 2,2'-H2biimidazole: Synthesis, Structure, Luminescent Property and Theoretical Calculation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第8期39卷 1451-1457,1359页

作者： ZHANG Hua XU Tongtong XING Tianyi WANG Xueying zuo jiamei KONG Zhiguo Key Laboratory of Preparation and Applications of Environmental Friendly Materials Jilin Normal UniversityMinistry of EducationChangchun 130103China Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityMinistry of EducationChangchun 130103China Department of Chemistry Jilin Normal UniversitySiping 136000China

Two new coordination complexes[Cd(L)2(1,2,3-HBTC)]·3H2O(1)and{[Zn(L)(1,2-BDC)]-H2O}n(2)were synthesized under hydrothermal conditions(1,2,3-H3 BTC=1,2,3-tricarboxybenzene,1,2-H2 BDC=1,2-dicarboxybenzene and L=2,2’-H2 biimidazole).1 crystallizes in monoclinic,space group P21/c with a=12.256(5),b=11.620(5),c=17.479(5)A,β=95.548(5)°,V=2477.6(16)A^3,Z=4,C21H22N8 O9 Cd,Mr=642.86,Dc=1.724 g/cm^3,F(000)=1296,μ(MoKa)=0.950 mm^-1,R=0.0546 and wR=0.1724.2 belongs to the monoclinic system,space group P21/c with a=7.408(4),b=20.743(10),c=10.194(5)A,β=95.648(6)°,V=1477.3(12)A^3,Z=4,C14H12N4 O5 Zn,Mr=381.65,Dc=1.716 g/cm3,F(000)=776,μ(MoKa)=1.698 mm^-1,R=0.0574 and wR=*** central Cd(Ⅱ)ion in 1 is coordinated with five atoms,forming a slightly distorted square-pyramidal *** central Zn(Ⅱ)ion in 2 is four-coordinated by two nitrogen atoms from one L ligand and two oxygen atoms from two different 1,2-BDC *** addition,luminescent property of 1 has been investigated,and natural bond orbital(NBO)analysis of 2 has been calculated by the B3LYP/LANL2DZ method.

关键词： structure coordination complex 2,2'-H_(2)biimidazole luminescent property

Study on the Effect of Moisture Conditioned for Brown Rice on Milling Characteristic

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast Agricultural University(English Edition) 2008年第3期15卷 50-55页

作者： ZHOU Yulong jia Fuguo zuo Yanjun Engineering College Northeast Agricultural University Harbin 150030 China

The effect of moisture conditioned for brown rice （moisture content of 1.45%） on milling characteristic was studied in this paper. Milling experiments were conducted for the brown rice, which were conditioned under different amount of humidification and duration. Software SAS was used to analyze the effect of amount of humidification and duration on the head rice yield and energy consumption of milled brown rice. The reasonable parameters including amount of humidification of 1.45% and duration of 60-90 rain were obtained, which decreased energy consumption by 30% and increased head rice yield by 10%. Therefore, the method of moisture conditioned can improve milling quality of stored paddy due to the hardness and crisp of paddy reduced.

关键词： brown rice humidification milling characteristic

Racial Trauma in Topdog/Underdog

在线全文

学校读者我要写书评

暂无评论

海外英语 2019年第5期 192-193页

作者：左佳 School of foreign Languages Jinggangshan University

The 2002 Pulitzer winner Topdog/Underdog by Suzan-Lori Parks presents us a predestined life story of two young AfricanAmericans Lincoln and Booth. In the play, the difficulties in accommodating individual trauma and the"unspeakable"collectivetrauma inflicted by racism overwhelm Lincoln and Booth and eventually destroy their identities.

关键词： Topdog/Underdog Individual Trauma Collective Trauma Identity

Number and Distribution of Fiducial Fibers in a Spectroscopic Survey Telescope

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第2期22卷 108-117页

作者： Shi-Peng Duan Zeng-Xiang Zhou jia-Le zuo Meng-Tao Li Zhi-Gang Liu Hong-Zhuan Hu jian-Ping Wang Xiang-Qun Cui Yong Zhang Hao-Tong Zhang Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology Chinese Academy of ScienceNanjing 210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China

To date,the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)has been in operation for 12 *** improve the telescope's astronomical observation accuracy,the original open-loop fiber positioning system of LAMOST is in urgent need of *** upgrade plan is to install several fiber view cameras(FVCs)around primary mirror B to build a closed-loop feedback control *** FVCs are 20 m from the focal *** reduce a series of errors when the cameras detect the positions of the optical fibers,we designed fiducial fibers on the focal surface to be fiducial points for the *** the number of fiducial fibers can improve the detection accuracy of the FVC system,but it will also certainly reduce the number of fiber positioners that can be used for ***,the focus of this paper is how to achieve the quantity and distribution that meet the requirements of system *** this paper,we introduce the necessity of using fiducial fibers,propose a method for selecting their number and present several methods for assessing the uniformity of their ***,we implement particle swarm optimization to find the best distribution of fiducial fibers.

关键词： instrumentation detectors-techniques image processing-methods data analysis-telescopes

三种纳米片组装的α-4CaO·5B_2O_3·7H_2O纳米结构的可控制备、表征及其阻燃性能

在线全文

学校读者我要写书评

暂无评论

化学学报 2010年第24期68卷 2535-2542页

作者：左佳刘志宏陕西师范大学化学与材料科学学院陕西省大分子科学重点实验室西安710062

以Ca(NO3)2·4H2O和Na2B4O7·10H2O为原料,水和乙醇为混合溶剂,在水热120℃条件下,可控制备了α-4CaO·5B2O3·7H2O纳米片以及由纳米片组装成的球形和蚕蛹状α-4CaO·5B2O3·7H2O纳米结构,通过X射线粉晶衍射(XRD)、X射线能谱分析(EDS)... 详细信息

以Ca(NO3)2·4H2O和Na2B4O7·10H2O为原料,水和乙醇为混合溶剂,在水热120℃条件下,可控制备了α-4CaO·5B2O3·7H2O纳米片以及由纳米片组装成的球形和蚕蛹状α-4CaO·5B2O3·7H2O纳米结构,通过X射线粉晶衍射(XRD)、X射线能谱分析(EDS)、红外光谱(FT-IR)和扫描电子显微镜(SEM)等手段对产物进行了表征.考察了反应温度、反应时间、溶剂及表面活性剂等条件对硼酸钙α-4CaO·5B2O3·7H2O形貌及尺寸的影响,提出了α-4CaO·5B2O3·7H2O纳米结构的可能形成机理.通过热分析法研究了三种不同形貌硼酸钙α-4CaO·5B2O3·7H2O样品的阻燃性能,结果表明其阻燃性能比非纳米样品好.

关键词：纳米结构水热反应硼酸钙热分析阻燃性能

在线全文

学校读者我要写书评

暂无评论

高校人才流动与基础研究创新产出

中国软科学 2024年第8期 60-70页

作者：余长林左佳厦门大学宏观经济研究中心福建厦门361005 厦门大学邹至庄经济研究院福建厦门361005 厦门大学经济学院福建厦门361005

激发创新主体活力,是知识经济时代提升国家创新体系整体效能和建设世界科技强国的重要内容。学术人才流动作为高校间人才竞争的表现形式,能否带来基础研究创新产出的提升以及相应的作用机制尚待明确。基于Web of Science数据库2008—201... 详细信息

激发创新主体活力,是知识经济时代提升国家创新体系整体效能和建设世界科技强国的重要内容。学术人才流动作为高校间人才竞争的表现形式,能否带来基础研究创新产出的提升以及相应的作用机制尚待明确。基于Web of Science数据库2008—2018年中国高校发表的论文数据,使用固定效应模型和工具变量方法从学术人才流动的视角回答如何提升基础研究科研效率这一问题。研究发现,高校人才流动能够促进知识溢出,从而提升高校基础研究产出效率。机制分析表明,高校之间的人才流动通过研究人员合作论文数量的增加以及流入学者与高校之间更好的匹配来实现高校科研效率的提升。异质性分析表明,高校人才流入对基础研究创新产出的影响在社会科学领域以及人才流向东部高校中更为显著。研究结论为现阶段如何提升基础研究产出效率、释放学术人才红利提供参考。

关键词：高校人才流动基础研究合作与匹配科研绩效

在线全文

学校读者我要写书评

暂无评论

56m双线简支箱梁桥的设计与施工

铁道标准设计 2014年第8期58卷 87-92页

作者：左家强铁道第三勘察设计院集团有限公司天津300142

太中银铁路小东川河特大桥跨越宽深山谷。主桥采用56 m双线整体简支箱梁,梁重约19 000 kN,采用矩形空心墩,最大墩高88.6m。采用BSAS程序建模计算分析,并结合车桥耦合动力仿真成果调整全桥设计,满足行车的安全性和舒适性。主梁采用专门... 详细信息

太中银铁路小东川河特大桥跨越宽深山谷。主桥采用56 m双线整体简支箱梁,梁重约19 000 kN,采用矩形空心墩,最大墩高88.6m。采用BSAS程序建模计算分析,并结合车桥耦合动力仿真成果调整全桥设计,满足行车的安全性和舒适性。主梁采用专门研制的造桥机进行移动支架节段拼装施工,高墩应用后移式悬臂爬模施工技术。该桥的设计施工表明,大跨度简支箱梁并采用造桥机施工是跨越宽深峡谷地形的理想方案,其建成通车后运营状态良好,说明铁路双线大跨度简支箱梁的设计施工技术具有重要的参考作用和推广价值。

关键词：铁路桥简支箱梁移动支架节段拼装设计施工

Framework analysis of fluoride salt-cooled high temperature reactor probabilistic safety assessment

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2015年第5期26卷 112-117页

作者：左嘉旭靖剑平毕金生宋维陈堃 The Nuclear and Radiation Safety Center Ministry of Environmental Protection Shanghai Institute of Applied Physics Chinese Academy of Sciences

Probabilistic safety assessment(PSA) is important in nuclear safety review and analysis. Because the design and physics of the fluoride salt-cooled high temperature reactor(FHR) differ greatly from the pressurized water reactor(PWR), the methods and steps of PSA in FHR should be studied. The high-temperature gascooled reactor(HTR-PM) and sodium-cooled fast reactors have built the PSA framework, and the framework to finish the PSA analysis. The FHR is compared with the PWR, HTR-PM and sodium-cooled fast reactors from the physics, design and safety. The PSA framework of FHR is discussed. In the FHR, the fuel and coolant combination provides large thermal margins to fuel damage(hundreds of degrees centigrade). The tristructuralisotropic(TRISO) as the fuel is independent in FHR core and its failure is limited for the core. The core damage in Level 1 PSA is of lower frequency. Levels 1 and 2 PSA are combined in the FHR PSA analysis. The initiating events analysis is the beginning, and the source term analysis and the release types are the target. Finally, Level3 PSA is done.

关键词：高温气冷堆概率安全评价压水反应堆框架分析安全评估氟盐快中子反应堆物理设计

高职金石文化与篆刻艺术教育实践——以浙江机电职业技术学院“金石文化”品牌建设为例

在线全文

学校读者我要写书评

暂无评论

浙江艺术职业学院学报 2009年第4期7卷 77-80页

作者：左家奇浙江机电职业技术学院党委

金石文化与篆刻艺术是我国几千年来艺术与技术结合的典范。高职教育如何倡导"技术与人文相融,技能与艺术并重",使艺术教育与高职能力本位的人才培养特色相结合,金石篆刻教育就是适合这一理念的重要形式。本文以浙江机电职业技术学院篆... 详细信息

金石文化与篆刻艺术是我国几千年来艺术与技术结合的典范。高职教育如何倡导"技术与人文相融,技能与艺术并重",使艺术教育与高职能力本位的人才培养特色相结合,金石篆刻教育就是适合这一理念的重要形式。本文以浙江机电职业技术学院篆刻艺术教育与金石文化实践活动为例,通过营造环境氛围,依托专业,创新课程模式,寓教于乐,打造精品社团,使金石篆刻教育渗透到技能和艺术相结合的教育中,让学生在金石上感受艺术与人生,为人文艺术教育提供一种新模式。

关键词：高职教育金石篆刻艺术教育