检索结果-南通市图书馆

Journal of Integrative Agriculture 2017年第9期16卷 1892-1899页

作者： LI Wen-lan SUN Qi LI Wen-cai YU Yan-li zhao Meng MENG zhao-dong Maize Research Institute Shandong Academy of Agricultural Sciences~National Engineering Laboratory of Wheat and Maize/Key Laboratory of Biology and Genetic Improvement of Maize in Northern Yellow-Huai River PlainMinistry of AgricultureJinan 250100.P.R.China

RING is a really interesting new gene which plays important regulatory roles in many developmental processes as well as in plant-environment interactions. In the present report, the Zm RHCP1 gene encoding a putative RING-HC protein was isolated from maize and characterized. The Zm RHCP1 protein contained 310 amino acid residues with a conserved RINGHC zinc-finger motif and two transmembrane（TM） domains. Zm RHCP1 was expressed ubiquitously in various organs（root, stem, leaf, seedling, immature ear, and tassel）, but its transcript levels were higher in vegetative organs than in reproductive organs. Moreover, the expression pattern of Zm RHCP1 in brace roots indicated that Zm RHCP1 functions in brace root initiation. In addition, Zm RHCP1 expression was regulated by abiotic stresses. The expression results suggested that Zm RHCP1 plays important roles in brace root development and abiotic stress responses. The findings of the present study provide important information to help us understand the function of Zm RHCP1 in maize.

关键词： RING-HC zinc-finger brace root expression abiotic stresses maize

Regularities of the Band Structures for the Even-Even Rare-Earth Nuclei

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1995年第7期12卷 385-388页

作者： zhao Yumin CHEN Yan ZONG Hongshi Department of Physics Nanjing UniversityNanjing 210008

The parametrizations,VNP and VNP/Vpair,are extracted empirically from nuclear binding *** systematics in the VNP and VNP/Vpairchemes,together with elegant regularities of the excitation energies for the ground,β and ... 详细信息

关键词： Regular Rare Even

A novel ligand-free palladium catalytic system with SO_3H-functional ionic liquids as cocatalyst for amidocarbonylation reaction

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

Chinese Chemical Letters 2008年第10期19卷 1175-1178页

作者： Qing Lu zhao Lai Lai Wang State Key Laboratory for Oxo Synthesis ＆ Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

Effects of Lewis acid BF3·OEt2, and BrCnsted acids TsOH, CF3COOH, H3PO4, and HCIO4 as cocatalyst respectively on the ligand-free palladium-catalyzed amidocarbonylation were investigated. SO3H-functional ionic liquids 1-methyl-3-（4-sulfonic acid）butylimidazolium hydrosulfate [MIm（CH2）4803H][HSO4] and 1-methyl-3-（4-sulfonic acid）butylimidazolium triflate [MIm（CH2）4SO3H][OTf] were firstly employed as cocatalysts instead of these Lewis acid and Brφnsted acids. By using a ligand-free and weak corrosive catalyst in situ prepared form PdBr2, LiBr.H2O, and [MIm（CH2）4SO3H][OTf], the arnidocarbo- nylation of benzaldehyde, acetamide, and CO could proceed smoothly and afford N-acetyl-α-phenylglycine with yield of 58% in [C6mim]PF6 medium.

关键词： Amidocarbonylation Palladium Ionic liquids Benzaldehyde N-Acyl-α-amino acid

Ambiguities of the Seiberg-Witten Map in the Presence of Matter Field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第5期37卷 571-574页

作者： Suo Bing Wang Pei zhao Liu Institute of Modern Physics Northwest University Xi'an 710069 China

The ambiguities of the Sciberg Witten map for gauge field coupled with fermionic matter arc *** find that only part of the ambiguities can be absorbed by gauge transformation and/or field redefinition and thusare negligible. The existence of matter field makes some other part of the ambiguities difficult to be absorbed by gaugetransformation or field redefinition.

关键词：规范场 Sekberg-Witten映象物质场

Research on Online Monitoring Methods on SF_(6) Circuit Breakers

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

高压电器 2019年第3期55卷 1-7,14页

作者： CHENG Tingting GAO Wensheng zhao Yuming Department of Electrical Engineering Tsinghua University Shenzhen Power Supply Company

To promote the accuracy and application of arcing time measurement for SF_6 circuit breaker in substation,five measurement methods are investigated by two cases experimentally. First,the test results of the five methods for a circuit breaker in different stages of wear and a circuit breaker with a component failure were presented. Then,the time error is analyzed by ***,the advantage and disadvantage of these methods are discussed.

关键词： circuit breaker high voltage circuit breaker arcing time arc duration online monitoring wavelet analysis

Recent Progress in Space Science and Applications of China’s Space Station in 2020-2022

在线全文

学校读者我要写书评

暂无评论

空间科学学报 2022年第4期42卷 503-510页

作者： GAO Ming zhao Guangheng GU Yidong Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing 100094

China scheduled to complete the assembly of the T-shaped Tiangong Space Station in 2022,and will enter a new stage of *** are more than 20 experiment racks inside the modules,and more than 50 external onboard payloads mounting spaces,which will support large-scale science and technology experiments during the *** development of internal experiment racks and external research accommodations approved during the construction has been completed,of which 4 racks in Tianhe core module,including High Microgravity Level research Rack(HMLR)and Container-less Materials Processing Rack(CMPR),have finished on-orbit tests;while other racks in Wentian and Mengtian experiment modules are under comprehensive ground *** Chinese Space Survey Telescope(CSST)has advanced much in the last two years with 24 pre-launch research projects funded and 4 joint science center built in preparation for CSST’s future scientific observations and *** systematic research planning for China’s Space Station(CSS)during 2022-2032 is updated with the researches classified into four important areas:space life sciences and human research,microgravity physical sciences,space astronomy and Earth science,and new space technologies and *** to the planning,more than 1000 experiments are expected to perform in CSS during the operating ***,the CSS utilization missions are proceeding as planned,which will contribute to the major scientific or application output and have a positive impact on the quality of life on Earth.

关键词： China’s Space Station(CSS) Space utilization Experiment racks Chinese Space Survey

Preparation of Polyaniline/TiO_2 Composite Nanotubes for Photodegradation of AZO Dyes

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) 2014年第3期29卷 468-472页

作者：程杨 AN Liang zhao Zongshan WANG Guanghui College of Chemical Engineering and Technology Wuhan University of Science and Technology Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education of the People's Republic of China Ocean University of China

Polyaniline （PANI） composite nanotubes （90-130 nm in diameter） containing titanium dioxide （TiO2） nanoparticles （about 10 nm in diameter） were synthesized through a self-assembly process in the presence of a-naphthalenesulfonic acid （a-NSA） as the dopant. It was found that PANI-TiO2 composites and PANI nanotubes both behaved with significant photocatalytic activities towards AZO dyes, during 2 h photocatalytic processes under natural light, the degradation ratio was 94.2% and 97.2% respectively （methyl orange and orange II）. The morphology of such products was characterized by SEM. The specific surface area of such composite nanotubes was 14.7 m2/g compared to normal polyaniline which was 0.27 m2/g. IR and X-ray diffraction characterizations showed that the chemical chain of the composite nanotubes was identical to that of the doped PANI. It may provide a new way for photodegradation of organic contaminants by using conjugated polymer with dimensional structure.

关键词： polyaniline TiO2 nanotube photocatalysis

Activity of comet 103P/Hartley 2 from September 30 to November 04, 2010

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1515-1518页

作者： SHI JlanChun zhao HaiBin MA YueHua Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China

The CCD photometric observation of comet 103P/Hartley 2 with broadband optical filters was carried out at Xuyi Station of Purple Mountain Observatory, Chinese Academy of Sciences by use of Near Earth Object Telescope （NEOT）. We monitored the comet from September 30 to November 4, 2010 and investigated the variation of activities. The Afp parameter derived from our r broadband data varies from 46.0 to 126.0 cm and increases with time. The dust production rate in terms of Afp was measured and a tentative calculation of the dust （or gas） loss-rate of nucleus was executed under the assumption that the nucleus of comet 103P/l-lartley 2 is spherical. The r-band image and the surface brightness profile taken on September 30, 2010 was measured and the gradient of surface brightness profile of 103P/Hartley 2 showed m 〈 -1.5,

关键词： comets 103P/Hartley 2 activity

[Zn4O] Cluster-Based Metal-Organic Frameworks as Catalysts for Conversion of CO2

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2019年第5期37卷 474-478页

作者： Wanzhen Qiao Tianqun Song Bin zhao College of Chemistry College of Chemistry Key Laboratory of Advanced Energy Material Chemistry MOE Nankai University Tianjin 300071 China Department of Chemistry Tianjin University Tianjin 300072 China

Summary of main observation and conclusion One unique two-dimensional (2D) Zn-MOF {Na[Zz1.5(μ4-O)(L)]}n (1) was synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. Four Zn atoms are bridged through μ4-O to form [Zn4O] clusters, which are further linked to form a 2D layer n etwork through shari ng Zn as vertexes. 1 exhibits high thermal stability up to 280 ℃ and keeps stable in comm on solve nts and water solutions with pH ranging from 1 to 13. The catalytic studies reveal that compound 1 exhibits excellent catalytic activity for cycloaddition of CO2 with epoxides into cyclic carb on ates un der mild conditions. Furthermore, 1 dem on strates good gen erality in CO2 coupli ng reactio n with extensive epoxides. Importantly, 1 can be reused for at least five times without significant reduction in catalytic ability.

关键词： Zn4O ability

ADAPTIVE CONTROLLER AND ITS APPLICATION IN FORCE SYSTEM OF ASYMMETRIC CYLINDER CONTROLLED BY SYMMETRIC VALVE

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

Chinese Journal of Mechanical Engineering 2007年第6期20卷 50-53页

作者： WU Zhenshun ZHANG Lichun zhao Chunlei School of Mechanical and Electrical Engineering Harbin Institute of Technology Harbin 150001 China

Partial pressure, system vibration and asymmetric system dynamic performance exit in asymmetric cylinder controller by symmetric valve hydraulic system. To solve this problem in the force control system, model reference adaptive controller is designed using equilibrium point stability theory and output error equation polynomial. The reference model is selected in such a way that it meets the system dynamic performance. Hardware configuration of asymmetric cylinder controlled by asymmetric valve hydraulic system is replaced by intelligent control algorithm, thus the cost is lowered and easy to application. Simulation results demonstrate that the proposed adaptive control sheme has good adaptive ability and well solves asymmetric dynamic performance problem. The designed adaptive controller is fairly robust to load disturbance and system parameter variation.

关键词： Asymmetric cylinder controlled by symmetric servo valve Model reference Balance point Adaptive control