检索结果-南通市图书馆

Synthesis and Properties of Novel Cationic Maleic Diester Polymerizable Surfactants

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第6期12卷 523-526页

作者： jian XU Gan zuo li Guo Wei ZHOU Fa Ye YAO Key Laboratory for Colloid and Interface Chemistry of State Education Ministry Shandong UniversityJinan 250100

Three new cationic polymerizable surfactants are synthesized by the reaction of alkylmaleic hemiester with glycidyltrimethylammonium chloride. Their structures are confirmed by H-1 NMR, IR and elements analysis. The values of CMC and gamma (CMC) of these surfactants have been measured. One can obtain nearly monodisperse polystyrene latex by emulsion polymerization using the polymerizable surfactant.

关键词： Polymerizable surfactant maleic diester surface active monomer surfmer

Quantum network communication: a discrete-time quantum-walk approach

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第4期61卷 199-208页

作者： Yuguang YANG Jiajie YANG Yihua ZHOU Weimin SHI Xiubo CHEN jian li Huijuan zuo Faculty of Information Technology Beijing University of Technology State Key Laboratory of Information Security (Institute of Information Engineering Chinese Academy of Sciences) Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications School of Computer Beijing University of Posts and Telecommunications College of Mathematics and Information Science Hebei Normal University

We study the problem of quantum multi-unicast communication over the butterfly network in a quantum-walk architecture, where multiple arbitrary single-qubit states are transmitted simultaneously between multiple source-sink pairs. Here, by introducing quantum walks, we demonstrate a quantum multiunicast communication scheme over the butterfly network and the inverted crown network, respectively,where the arbitrary single-qubit states can be efficiently transferred with both the probability and the state fidelity one. The presented result concerns only the butterfly network and the inverted crown network, but our techniques can be applied to a more general graph. It paves a way to combine quantum computation and quantum network communication.

关键词： network coding quantum network coding quantum walk state fidelity butterfly network inverted crown network

Comparative Studies of 1,4-Bis[2-(4-Pyridyl)ethenyl]-benzene Using Density Functional Theory

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第4期23卷 469-473页

作者： CHENG jian-bo Lǚ Jia-ping GONG Bao-an li Wen-zuo Science and Engineering College of Chemistry and Biology Yantai University Yantai 264005 P. R. China

The optimized molecular structure and harmonic vibrational frequencies of a 1,4-bis [ 2-（4-pyridyl）ethenyl]- benzene（BPENB） molecule were calculated via five popular density functional theory（DFI＇） methods. On the basis of the comparison between calculated and experimental results, it is concluded that the B3PW91 and B3LYP methods are superior to the others in optimizing structures, and the BPW91 method reproduces the observed fundamental fre-quencies most satisfactorily.

关键词： 1,4-Bis[2-(4-pyridyl)ethenyl]-benzene Density functional theory Vibrational frequencies BPW91

Phase Selection and Microstructure Evolution Dependance on Composition for Zr-Fe Eutectic Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第10期37卷 1689-1702页

作者： Dong-Dong zuo jian Chang Hai-Peng Wang School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an710072China

The knowledge of the phase selection and microstructure evolution of Zr-Fe eutectic alloys is still poorly *** presumed eutectic alloy with a nominal composition of Zr76.0Fe24.0 was discovered to contain a significant proportion ofα-Zr ***,phase selection and microstructure evolution dependance on composition for Zr-Fe eutectic alloys was experimentally determined by using differential scanning calorimetry(DSC)and meticulous electron *** alloys,spanning the composition range of 73.5-74.7%Zr,were examined to investigate microstructure evolution and non-isothermal crystallization *** indicate that in alloys ranging from Zr_(73.5)Fe_(26.5) to Zr_(73.9)Fe_(26.1),the primary FeZr_(2) phase demonstrates preferential growth,followed by eutectic microstructure formation during liquid alloy *** volume fraction of FeZr_(2) dendrites decreases as the Zr content ***,in alloys ranging from Zr_(74.0)Fe_(26.0) to Zr_(74.7)Fe_(25.3),primaryβ-Zr dendrites preferentially grow,followed by a eutectic reaction in the remaining liquid *** content ofα-Zr dendrites reduces with decreasing Zr *** mentioned above,a critical composition range for phase selection is defined as Zr_(x)Fe100.0−x(73.9

关键词： Phase selection Thermal analysis Microstructure evolution Crystallization kinetic

Validation of significant wave height retrieval from co-polarization Chinese Gaofen-3 SAR imagery using an improved algorithm

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

Acta Oceanologica Sinica 2018年第6期37卷 1-10页

作者： SHENG Yexin SHAO Weizeng ZHU Shuai SUN jian YUAN Xinzhe li Shuiqing SHI jian zuo Juncheng Marine Science and Technology College Zhejiang Ocean University Zhoushan 316000 China Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Qingdao 266100 China National Satellite Ocean Application Service State Oceanic Administration Beijing 100081 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Laboratory for Ocean Dynamics and Climate Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China College of Meteorology and Oceanography National University of Defense Technology Nanjing 210007 China

Chinese Gaofen-3（GF-3） is the first civilian satellite to carry C-band（5.3 GHz） synthetic aperture radar（SAR）.During the period of August 2016 to December 2017, 1 523 GF-3 SAR images acquired in quad-polarization（vertical-vertical（VV）, horizontal-horizontal（HH）, vertical-horizontal（VH）, and horizontal-vertical（HV）） mode were recorded, mostly around China＇s seas. In our previous study, the root mean square error（RMSE） of significant wave height（SWH） was found to be around 0.58 m when compared with retrieval results from a few GF-3 SAR images in co-polarization（VV and HH） with moored measurements by using an empirical algorithm CSARWAVE. We collected a number of sub-scenes from these 1 523 images in the co-polarization channel,which were collocated with wind and SWH data from the European Centre for Medium-Range Weather Forecasts（ECMWF） reanalysis field at a 0.125° grid. Through the collected dataset, an improved empirical wave retrieval algorithm for GF-3 SAR in co-polarization was tuned, herein denoted as CSARWAVE2. An additional 92 GF-3 SAR images were implemented in order to validate CSARWAVE2 against SWH from altimeter Jason-2, showing an about 0.52 m RMSE of SWH for co-polarization GF-3 SAR. Therefore, we conclude that the proposed empirical algorithm has a good performance for wave retrieval from GF-3 SAR images in co-polarization.

关键词： Gaofen-3 synthetic aperture radar significant wave height

Layout effects and optimization of runoff storage and filtration facilities based on SWMM simulation in a demonstration area

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2016年第2期9卷 115-124页

作者： Wei Xing Peng li Shang-bing Cao li-li Gan Feng-lin liu jian-e zuo State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University School of Civil Engineering Beijing Jiaotong University State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research

The layout effects and optimization of runoff storage and filtration facilities are crucial to the efficiency and management of the cost of runoff control, but related research is still lacking. In this study, scenarios with different layouts were simulated using the storm water management model(SWMM), to investigate the layout effects on control efficiency with different precipitations. In a rainfall event with 50 mm of precipitation in two hours, 1820 scenarios with different layouts of four facilities constructed in 16 sub-catchments were simulated, the reduction rates of internal flow presented a standard deviation of 10.9%, and the difference between the maximum and minimum reduction rates reached59.7%. Based on weighting analysis, an integrated ranking index was obtained and used to determine the optimal layout scenarios considering different rainfall events. In the optimal scenario(storage and filtration facilities constructed in sub-catchments 14, 12, 7, and 2), the reduction rates of the total outflow reached 31.4%, 26.4%, and 14.7%, respectively, with 30, 50, and 80 mm of precipitation. The reduction rate of the internal outflow reached 95% with 50 mm of precipitation and approximately 56% with 80 mm of precipitation.

关键词： Layout Optimization Rainwater storage pond Stormwater control Storm water management model (SWMM)

Wave parameters retrieval for dual-polarization C-band synthetic aperture radar using a theoretical-based algorithm under cyclonic conditions

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第5期38卷 21-31页

作者： Yingying Ding Juncheng zuo Weizeng Shao jian Shi Xinzhe Yuan jian Sun Jiachen Hu Xiaofeng li Marine Science and Technology College Zhejiang Ocean University College of Meteorology and Oceanography National University of Defense Technology National Satellite Ocean Application Service Ministry of Natural Resources Physical Oceanography Laboratory Ocean University of China Global Science and Technology National Oceanic and Atmospheric Administration (NOAA) National Environmental Satellite Data and Information Service (NOAA)

Theoretical-based ocean wave retrieval algorithms are applied by inverting a synthetic aperture radar(SAR)intensity spectrum into a wave spectrum, that has been developed based on a SAR wave mapping mechanism. In our previous studies, it was shown that the wave retrieval algorithm, named the parameterized first-guess spectrum method(PFSM), works for C-band and X-band SAR at low to moderate sea states. In this work, we investigate the performance of the PFSM algorithm when it is applied for dual-polarization c-band sentinel-1(S-1) SAR acquired in extra wide-swath(EW) and interferometric wide-swath(IW) mode under cyclonic *** winds are retrieved from six vertical-horizontal(VH) polarization S-1 SAR images using the c-band crosspolarization coupled-parameters ocean(C-3 PO) model and then wave parameters are obtained from the image at the vertical-vertical(VV) polarization channel. significant wave height(SWH) and mean wave period(MWP) are compared with simulations from the WAVEWATCH-III(WW3) model. The validation shows a 0.69 m root mean square error(RMSE) of SWH with a –0.01 m bias and a 0.62 s RMSE of MWP with a –0.17 s bias. Although the PFSM algorithm relies on a good quality SAR spectrum, this study confirms the applicability for wave retrieval from an S-1 SAR image. Moreover, it is found that the retrieved results have less accuracy on the right sector of cyclone eyes where swell directly affects strong wind-sea, while the PFSM algorithm works well on the left and rear sectors of cyclone eyes where the interaction of wind-sea and swell is relatively poor.

关键词： wave parameters synthetic aperture radar cyclonic condition

Diffusion magnetic resonance imaging for Brainnetome:A critical review

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2012年第4期28卷 375-388页

作者： Nianming zuo jian Cheng Tianzi jiang liAMM Center for Computational Medicine National Laboratory of Pattern RecognitionInstitute of AutomationTheChinese Academy of SciencesBeijing 100190China Key Laboratory for Neurolnformation of Ministry of Education School of Life Science and TechnologyUniversity ofElectronic Science and Technology of ChinaChengdu 610054China The Queensland Brain Institute The University of QueenslandBrisbaneQLD 4072Australia

Increasing evidence shows that the human brain is a highly self-organized system that shows attributes of smallworldness,hierarchy and *** ＂connectome＂ was conceived several years ago to identify the underpinning physical connectivities of brain *** need for an integration of multi-spatial and-temporal approaches is becoming ***,the ＂Brainnetome＂（brain-net-ome） project was *** magnetic resonance imaging（dMRI） is a non-invasive way to study the anatomy of brain ***,we review the principles of dMRI,its methodologies,and some of its clinical applications for the *** research in this field is discussed.

关键词： brain mapping neural networks magnetic resonance imaging imaging

Protein S-Nitrosylation in plants: Current progresses and challenges

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2019年第12期61卷 1206-1223页

作者： jian Feng lichao Chen jianru zuo Sainsbury Laboratory University of CambridgeCambridge CB21LRUK State Key Laboratory of Plant Genomics and National Center for Plant Gene Research CAS Center for Excellence in Molecular Plant SciencesInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China The University of Chinese Academy of Sciences Beijing 100049China

Nitric oxide(NO)is an important signaling molecule regulating diverse biological processes in all living organisms.A major physiological function of NO is executed via protein S-nitrosylation,a redox-based the past decade,significant progress has been made in functional characterization of S-nitrosylated proteins Inviteposttranslational modification by covalently adding a NO molecule to a reactive cysteine thiol of a target protein.S-nitrosylation is an evolutionarily conserved mechanism modulating multiple aspects of cellular *** *** evidence indicates that protein Snitrosylation is ubiquitously involved in the regulation of plant development and stress *** we review current understanding on the regulatory mechanisms of protein S-nitrosylation in various biological processes in plants and highlight key challenges in this field.

关键词： field. adding conserved