检索结果-南通市图书馆

Chinese Journal of Natural Medicines 2016年第3期14卷 177-184页

作者： ZHU Chun-Sheng LIN zhi-Jian XIAO Ming-Liang niu hong-Juan ZHANG Bing School of Chinese Pharmacy Beijing University of Chinese Medicine

Since the chromatographic fingerprint was introduced, it has been accepted by many countries to assess the quality and authenticity of Chinese herbal medicine （CHM）. However, solely using the chromatographic fingerprint to assay numerous chemicals is not suitable for the assessment of the whole internal quality and pharmacodynamics of CHM. Consequently, it is necessary to develop a rational approach to connecting the chromatographic fingerprint with effective components to assess the internal quality of CHM. For this purpose, a spec^tun-effect relationship theory was proposed and accepted as a new method for the assessment of CHM because of its potential use to screen effective components from CHM. In this paper, we systematically reviewed the application of the spectrum-effect relationship theory in the research of CHM, including research mentality, different chromatographic analysis techniques, data processing technologies, and structure determination.

关键词： Chinese herbal medicine Chromatographic fingerprint Spectrum-effect relationship

Characterization of the Purified Glutathione S-transferases from Two Psocids Liposcelis bostrychophila and ***

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第7期9卷 1008-1016页

作者： DOU Wei XIAO Li-sha niu Jin-zhi JIANG hong-bo WANG Jin-jun Key Laboratory of Entomology and Pest Control Engineering College of Plant Protection Southwest University Chongqing 400716 P.R. China

Glutathione S-transferases（GSTs） from Liposcelis bostrychophila Badonnel and ***（Enderlein）（Psocoptera：Liposcelididae） were purified by glutathione-agarose affinity chromatography,and characterized subsequently by their Michaelis-Menten kinetics toward the artificial substrates 1-chloro-2,4-dinitrobenzene（CDNB） and reduced glutathione（GSH）,*** specific activity of the purified GST toward CDNB was 2.3-fold higher in *** than in *** the specific activities of purified enzymes varied between the two species,the purification yields were ***-PAGE revealed one band at 23 kDa for both the *** of *** exhibited higher Michaelis-Menten constants（Km） but lower maximal velocity（Vmax） values than those of *** optimum pH for CDNB conjugation of *** and *** GSTs was 7.0 and 7.5,and optimum temperature was 35 and 40°C,*** kinetics showed that cibacron blue,curcumin,bromosulfalein,ethacrynic acid,and carbosulfan had excellent inhibitory effects on GSTs in both species,but the inhibitory effects of beta-cypermethrin,fenpropathrin,tetraethylthiuram disulfide,and diethyl maleate were not significant.

关键词： GSTs purification psocids xenobiotic compounds

Regulating the oxygen-atom configuration of carbon anode enabling extremely fast-charging potassium-ion hybrid capacitors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 373-381页

作者： Daping Qiu Yuehui Wang Lulu Zhang Hang Lei Haizhou Ying Jin niu Min Li Xuelin Yang Feng Wang Ru Yang Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering and New EnergyChina Three Gorges UniversityYichang 443002China State Key Laboratory of Chemical Resource Engineering Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China College of Materials and Chemical Engineering China Three Gorges UniversityYichang 443002China

Metal-ion hybrid capacitors,such as potassium-ion hybrid capacitors(PIHCs),are regarded as promising fast-charging energy storage ***,the kinetics mismatch between the battery anode and the capacitive cathode restricts their fastcharging *** constructing carbon anodes with enhanced kinetics is an innovative approach to address this ***,using epigallocatechin gallate with high oxygen content as the precursor,oxygen-enriched carbon materials(OEC)with tunable C=O content are successfully ***,the C=O content of OEC is regulated by adjusting the pyrolysis *** as an anode for PIHCs,OEC-600 with the highest C=O content exhibits an attractive fast-charging specific capacity of 135.2 mAh·g^(-1)at 20 A·g^(-1),along with a superior fast-charging cycling *** theoretical calculations,comprehensive kinetics analysis and in-situ Raman,the positive effects of C=O on the potassium storage capability and reversibility of OEC-600 are ***,PIHCs assembled based on an OEC-600 anode deliver impressive energy/power density of 145.1 Wh·kg^(-1)/45.9 kW·kg^(-1)and superior fast-charging cycling stability with 87.5%of capacity retention over 20,000 cycles at 5 A·g^(-1).This work is anticipated to provide an optional design concept toward the carbon anode for fast-charging PIHCs.

关键词： carbon anode oxygen epigallocatechin gallate potassium-ion hybrid capacitor

The Multi-parameter Test of Gravitational Wave Dispersion with Principal Component Analysis

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

Research in Astronomy and Astrophysics 2024年第5期24卷 140-150页

作者： zhi-Chu Ma Rui niu Wen Zhao CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China

In this work, we consider a conventional test of gravitational wave(GW) propagation which is based on the phenomenological parameterized dispersion relation to describe potential departures from General Relativity(GR)along the propagation of GWs. But different from tests conventionally performed previously, we vary multiple deformation coefficients simultaneously and employ the principal component analysis(PCA) method to remedy the strong degeneracy among deformation coefficients and obtain informative posteriors. The dominant PCA components can be better measured and constrained, and thus are expected to be more sensitive to potential departures from the waveform model. Using this method we analyze ten selected events and get the result that the combined posteriors of the dominant PCA parameters are consistent with GR within 99.7% credible intervals. The standard deviation of the first dominant PCA parameter is three times smaller than that of the original dispersion parameter of the leading order. However, the multi-parameter test with PCA is more sensitive to not only potential deviations from GR but also systematic errors of waveform models. The difference in results obtained by using different waveform templates hints that the demands of waveform accuracy are higher to perform the multiparameter test with PCA. Whereas, it cannot be strictly proven that the deviation is indeed and only induced by systematic errors. It requires more thorough research in the future to exclude other possible reasons in parameter estimation and data processing.

关键词： gravitational waves-gravitation-black hole physics

Ar adsorptions on Al (111) and Ir (111) surfaces:a first-principles study

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第2期21卷 437-444页

作者： niu Wen-Xia Zhang hong Institution of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China College of Physical Science and Technology Sichuan UniversityChengdu 610065China

We investigate the adsorptions of Ar on Al （111） and Ir （111） surfaces at the four high symmetry sites, i.e., top, bridge, fcc- and hcp-hollow sites at the coverage of 0.25 monolayer （ML） using the density functional theory within the generalized gradient approximation of Perdew, Burke and Ernzerhof functions. The geometric structures, the binding energies, the electronic properties of argon atoms adsorbed on Al （111） and Ir （111） surfaces, the difference in electron density between on the Al （111） surface and on the Ir （111） surface and the total density of states are calculated. Our studies indicate that the most stable adsorption site of Ar on the Al （111） surface is found to be the fcc-hollow site for the （2 x 2） structure. The corresponding binding energy of an argon atom at this site is 0.538 eV/Ar atom at a coverage of 0.25 ML. For the Ar adsorption on Ir （111） surface at the same coverage, the most favourable site is the hcp-hollow site, with a corresponding binding energy of 0.493 eV. The total density of states （TDOS） is analysed for Ar adsorption on Al （111） surface and it is concluded that the adsorption behaviour is dominated by the interaction between 3s, 3p orbits of Ar atom and the 3p orbit of the base Al metal and the formation of sp hybrid orbital. For Ar adsorption on Ir （111） surface, the conclusion is that the main interaction in the process of Ar adsorption on Ir （111） surface comes from the 3s and 3p orbits of argon atom and 5d orbit of Ir atom.

关键词： density-functional theory binding energy adsorption electronic structure

Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H_(2)/CO_(2) separation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第8期34卷 67-75页

作者： Hengfei Zhang Yibin Wei Shufeng niu hong Qi State Key Laboratory of Material-Oriented Chemical Engineering Membrane Science and Technology Research CenterNanjing Tech UniversityNanjing 210009China hongyi Ceramic Membranes Research Institute Nanjing Hongyi Ceramic Nanofiltration Membranes Co.Ltd.Nanjing 210009China

Monometallic doping has proved its superiority in improving either permselectivity or H_(2) permeability of organosilica membranes for H_(2)/CO_(2) separation,but it is still challenging to break the trade-off ***,we report a series of Pd-Nb bimetallic doped 1,2-bis(triethoxysilyl)ethane(Pd-Nb-BTESE,PNB)membranes with different metal doping routes for simultaneously improving H_(2) permeance and H_(2)/CO_(2) permselectivity by the synergetic effects of Pd and *** doped Pd can exist in the BTESE network as nanoparticles while the doped Nb is incorporated into BTESE network forming Nb-O-Si covalent *** metal doping routes significantly influence the microstructure of PNB networks and gas separation performance of the PNB *** found that the PNB membrane with Pd doping priority(PNB-Pd)exhibited the highest surface area and pore volume,comparing with Nb doping priority(PNB-Nb)or Pd-Nb simultaneous doping(PNB-PdNb).The PNB-Pd membrane could not only exhibit an excellent H_(2) permeance of~10^(−6) mol·m^(−2)·s^(−1)·Pa^(−1) but also a high H_(2)/CO_(2) permselectivity of *** findings may provide novel insights into preparation of bimetallic doped organosilica membranes with excellent H_(2)/CO_(2) separation performance.

关键词： Hydrogen Separation Membranes Bimetallic doping Organosilica

GENERALIZED PREDICTIVE CONTROL FOR DIFFERENCE-ALGEBRAIC BIOLOGICAL ECONOMIC SYSTEMS

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2013年第6期6卷 1-16页

作者： hong niu QINGLING ZHANG Institute of System Science Northeastern University 110819 Shenyang P R. China College of Science Liaoning Shihua University 113001 Fushun P. R. China Institute of System Science Northeastern University 110819 Shenyang P. R. China

In this paper, a nonlinear difference-algebraic system is used to model some populations with stage structure when the harvest behavior and the economic interest are considered. The stability analysis is studied at the equilibrium points. After the non- linear difference-algebraic system is changed into a linear system with the unmodeled dynamics, a generalized predictive controller with feedforward compensator is designed to stabilize the system. Adaptive-network-based fuzzy inference system （ANFIS） is used to make the unmodeled dynamic compensated. An example illustrates the effectiveness of the proposed control method.

关键词： Difference-algebraic system economic interest generalized predictive control ANFIS.

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

构建方便、安全、可靠的新电子政务系统

苏州大学学报（工科版） 2003年第5期23卷 25-29页

作者：芮延年董玉民张志红纽秀山苏州大学机电工程学院江苏苏州215021 青岛建筑工程学院山东青岛266021

现代新型电子政务管理系统包括“行政决策系统”、“行政执行系统”和“行政监督系统”。本文通过研究构建了电子政务系统的功能模型,并在此基础上对电子政务系统的权限管理、数字签名,进行了较为深入的研究,为构建方便、安全、可靠的... 详细信息

现代新型电子政务管理系统包括“行政决策系统”、“行政执行系统”和“行政监督系统”。本文通过研究构建了电子政务系统的功能模型,并在此基础上对电子政务系统的权限管理、数字签名,进行了较为深入的研究,为构建方便、安全、可靠的新电子政务系统平台奠定了理论基础。

关键词：电子政务管理系统功能模型权限管理数字签名构建

Enhanced corrosion resistance of epoxy resin coating via addition of CeO_(2) and benzotriazole

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第3期67卷 89-96页

作者： Xu Han Ruijie Guo Baolong niu hong Yan College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

The use of fillers to enhance the corrosion protection of epoxy resins has been widely *** this work,cerium dioxide(CeO_(2))and benzotriazole(BTA)were introduced into an epoxy resin to enhance the corrosion resistance of Q235 carbon *** electron microscopy results indicated that the CeO_(2) grains were rod-like and ellipsoidal in shape,and the distribution pattern of BTA was analyzed by energy dispersive *** dynamic potential polarization curve proved the excellent corrosion resistance of the composite epoxy resin with CeO_(2) and BTA co-addition,and electrochemical impedance spectroscopy test analysis indicated the significantly enhanced long-term corrosion protection performance of the composite *** the optimal protective performance was provided by the coating containing 0.3%(mass)CeO_(2) and 20%(mass)BTA,which was attributed to the barrier performance of CeO_(2) particles and the chemical barrier effect of *** formation of corrosion products was analyzed using X-ray *** addition,the corrosion resistance mechanism of the coating was also discussed in detail.

关键词： Benzotriazole Cerium dioxide Corrosion resistance Carbon steel Epoxy resin coating Preparation

A multifunctional separator with Mg(OH)2 nanoflake coatings for safe lithium-metal batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第1期30卷 75-83,I0003页

作者： Dian-Hui Han Meng Zhang Peng-Xian Lu Yun-Lu Wan Qiu-Ling Chen hong-Yu niu zhi-Wei Yu School of Materials Science and Engineering Henan University of TechnologyZhengzhou 450007HenanChina Zhengzhou Key Laboratory for Clean Energy Henan University of TechnologyZhengzhou 450007HenanChina

Dendrite growth and thermal runaway induce serious safety hazards,impeding the practical applications of lithium metal batteries(LMBs).Although extensive advances have been attained in terms of LMB safety,most work only focus on a single aspect at a *** paper reports a multifunctional separator coated by Mg(OH)2 nanoflakes with various excellent properties including electrolyte wettability,ionic conductivity,Li+ transference number,puncture strength,thermal stability and flame *** used in LMBs,the Mg(OH)2 nanoflake coatings enable uniform Li+ distributing,which makes it homogeneous to deposit lithium,realizing effective dendrite suppression and less volume ***,Mg(OH)2 coatings can ensure LMBs are in normal conditions without thermal runaway until 140 ℃.A part of lithium can be converted into Li+ ions by Mg(OH)2 during repeated charge/discharge cycles,not only reducing the risk of separator damage and consequent short circuit,but also replenishing the capacity loss of *** Mg(OH)2 nanoflakes can coat on all kinds of commercial separators to improve their performances,which offers a facile but effective strategy for fabricating multifunctional separators and a comprehensive insight into enhancing LMB safety.

关键词： Dendrite-free Thermal stability Li metal batteries Multifunctional separators Mg(OH)2 nanoflakes