检索结果-南通市图书馆

Metalloporphyrin receptors for histidine-containing peptides

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第5期25卷 659-662页

作者： hui liu Zhan-Ting Li Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering & PharmacyWuhan Institute of Technology State Key Laboratory of Bio-Organic and Natural Products Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences

Two new ditopic metalloporphyrin receptors constructed by combining metalloporphyrin with crown ethers have been prepared and characterized.1H NMR and MS spectra confirmed the complexation of receptor with peptide driven by coordination interaction and hydrogen ***/vis experiments revealed that the receptors exhibited high binding affinity to histidine-containing *** receptors could differentiate short peptides of C-terminal histidine and N-terminal histidine and formed the most stable complexes with tripeptide.

关键词： Metallop or phyrin Crown ether Synthetic receptor Peptide

Dyes wastewater treatment by reduction-oxidation process in an electrochemical reactor packed with natural manganese mineral

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第1期18卷 17-22页

作者： WANG Ai-min QU Jiu-hui liu hui-juan LEI Peng-ju State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

A novel technology which combined electrochemical process catalyzed by manganese mineral with electro-assisted coagulation process was proposed in this study. The mineralization of organic pollutant from simulated dye wastewater containing an azo dye Acid Red B（ARB） was experimentally investigated using this method. It was found that the manganese mineral could catalyze the electrochemical process dramatically. The TOC removal percentage of electrochemical treatment catalyzed by manganese mineral was 43.6% while the TOC removal percentage of the process using the manganese mineral alone and using the electrolysis alone were 9.3% and 20.8%, respectively. Moreover, it was found that combined electroxidation with electro-assisted coagulation process could more effectively eliminate ARB. After a period of 180 min electrooxidation and 300 min electroreduction, almost 66.9% of TOC was removed, and the dissolved Mn^2＋. could be effectivly removed. The effects of the order of oxidation and reduction, the proper ratio electrooxidation/reduction time, and current density on the removal efficiency were investigated in detail. In addition, a proposed mechanism of manganese-mineral-catalyzed electrooxidation-reduction process was discussed in this paper.

关键词： manganese mineral electroreduction electrooxidation catalyze Acid Red B

在线全文

学校读者我要写书评

暂无评论

石墨烯-硼烯共面异质结结构和性质计算研究

原子与分子物理学报 2025年第1期42卷 75-80页

作者：刘会彬刘品妍陈思雨李昕玥张震张孟华东理工大学上海200237

采用密度泛函理论系统研究了石墨烯和χ_(3)硼烯构造共面异质结的可行性、结构和性质.通过对体系能量的计算,找到了稳定的石墨烯-χ_(3)硼烯共面二维异质结体系,并对构造方式、电学和光学性质进行了详细地分析与讨论.研究发现异质结体... 详细信息

采用密度泛函理论系统研究了石墨烯和χ_(3)硼烯构造共面异质结的可行性、结构和性质.通过对体系能量的计算,找到了稳定的石墨烯-χ_(3)硼烯共面二维异质结体系,并对构造方式、电学和光学性质进行了详细地分析与讨论.研究发现异质结体系界面处以碳六元环和硼五元环头对头相连接.对电荷转移和态密度分析得出石墨烯与硼烯之间形成稳定共价键.该体系具有零带隙和金属性的性质,且可见光波段吸收性能优异,具有潜在应用价值.

关键词：硼烯石墨烯异质结密度泛函理论

A SET OF SYMMETRIC QUADRATURE RULES ON TRIANGLES AND TETRAHEDRA

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2009年第1期27卷 89-96页

作者： Linbo Zhang Tao Cui hui liu LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

We present a program for computing symmetric quadrature rules on triangles and tetrahedra. A set of rules are obtained by using this program. Quadrature rules up to order 21 on triangles and up to order 14 on tetrahedra have been obtained which are useful for use in finite element computations. All rules presented here have positive weights with points lying within the integration domain.

关键词： Finite element Numerical integration Quadrature Cubature Triangle Tetrahedron.

Effects of Crystallinity and Defects of Layered Carbon Materials on Potassium Storage:A Review and Prediction

在线全文

学校读者我要写书评

暂无评论

Electrochemical Energy Reviews 2022年第2期5卷 401-433页

作者： Xiaoxu liu Tianyi Ji Hai Guo hui Wang Junqi Li hui liu Zexiang Shen Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials School of Material Science and EngineeringShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore College of Computer Science and Technology Dalian Minzu UniversityDalian 116650LiaoningChina

Layered carbon materials(LCMs)are composed of basic carbon layer units,such as graphite,soft carbon,hard carbon,and *** they have been widely applied in the anode of potassium-ion batteries,the potassium storage mechanisms and performances of various LCMs are isolated and difficult to relate to each *** importantly,there is a lack of a systematic understanding of the correlation between the basic microstructural unit(crystallinity and defects)and the potas-sium storage *** this review,we explored the key structural factors affecting the potassium storage in LCMs,namely,the crystallinity and defects of carbon layers,and the key parameters(L_(a),L_(c),d_(002),I_(D)/I_(G))that characterize the crystallinity and defects of different carbon materials were extracted from various databases and literature sources.A structure–property database of LCMs was thus built,and the effects of these key structural parameters on the potassium storage properties,including the capacity,the rate and the working voltage plateau,were systematically *** on the structure–prop-erty database analysis and the guidance of thermodynamics and kinetics,a relationship between various LCMs and potas-sium storage properties was ***,with the help of machine learning,the key structural parameters of layered carbon anodes were used for the first time to predict the potassium storage performance so that the large amount of research data in the database could more effectively guide the scientific research and engineering application of LCMs in the future.

关键词： Layered carbon materials Crystallinity and defects Potassium storage properties Machine learning

An Intelligent Non-Collocated Control Strategy for Ball-Screw Feed Drives with Dynamic Variations

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

Engineering 2017年第5期3卷 641-647页

作者： hui liu Jun Zhang Wanhua Zhao State Key Laboratory for Manufacturing Systems Engineering Xi'an fiaotung University. Xi'an 710054 China Collaborative Innovation Center of High-End Manufacturing Equipment Xi'an fiaotong University Xi'an 710054 China

The ball-screw feed drive has varying high-order dynamic characteristics due to flexibilities of the slender screw spindle and joints between components, and an obvious feature of non-collocated control when a direct position measurement using a linear＇scale is employed. The dynamic characteristics and non- collocated situation have long been the source of difficulties in motion and vibration control, and deterio- rate the achieved accuracy of the axis motion. In this study, a dynamic model using a frequency-based sub- structure approach is established, considering the flexibilities and their variation. The position-dependent variation of the dynamic characteristics is then fully investigated. A corresponding control strategy, which is composed of a modal characteristic modifier （MCM） and an intelligent adaptive tuning algorithm （ATA）, is then developed. The MCM utilizes a combination of peak filters and notch filters, thereby shaping the plant dynamics into a virtual collocated system and avoiding control spillover. An ATA using an artificial neural network （ANN） as a smooth parameter interpolator updates the parameters of the filters in real time in order to cope with the feed drive＇s dynamic variation. Numerical verification of the effectiveness and robustness of the orooosed strategy is shown for a real feed drive.

关键词： Ball-screw feed drives Varying high-order dynamics Non-collocated control Modal characteristic modifier Intelligent adaptive tuning algorithm

Development of nitrogen and sulfur-doped carbon dots for cellular imaging

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

Journal of Pharmaceutical Analysis 2019年第2期9卷 127-132页

作者： hui liu Yue Zhang Chengzhi Huang Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University) Ministry of EducationCollege of Pharmaceutical SciencesSouthwest University Chongqing Key Laboratory of Biomedical Analysis (Southwest University) Chongqing Science & Technology CommissionCollege of Chemistry and Chemical EngineeringSouthwest University

Heteroatom-doped carbon dots(CDs) have attracted extensive interest because of their improved electronic and fluorescence properties with heteroatom doping. In this study, a new synthetic method for nitrogen(N) and sulfur(S)-doped CDs was developed via a hydrothermal method using methionine and citric acid as raw materials. The as-prepared CDs exhibit excellent optical properties and good biocompatibility. The spherical N,S-doped CDs have an average diameter of 5 nm. They consist of C, O, N and S, and take on excellent water solubility due to the hydroxyl and carboxyl, amino groups on the *** CDs have a photoluminescence quantum yield of 13.8% using quinine sulfate as a reference; the average fluorescence lifetime of the CDs was 3.67 ns. The CDs solution present good photoluminescence properties, and the maximum excitation wavelength and emission wavelength locate at 330 nm and405 nm, respectively. In addition, their fluorescence intensity almost does not change under the conditions of acid, alkali, and high salt, which indicated their anti-photobleaching property and good light stability. Based on the good biocompatibility and strong fluorescence emission of the CDs, they can be used as fluorescent imaging reagents.

关键词： N,S-doped carbon dots Fluorescent reagent Cellular imaging

A novel optimization method of transient stability emergency control based on practical dynamic security region (PDSR) of power systems

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2004年第3期47卷 376-384页

作者： YU Yixin liu hui ZENG Yuan School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

This paper proposes a novel optimization method of transient stability emergency control based on a new concept of the so-called extended practical dynamic security region (EPDSR) defined in this paper and four experiential laws about the EPDSRs found from a number of studies in real power systems. In this method, the effect of a control action is represented by the displacement of EPDSRs critical hyper-plane boundary in the direction of its outer normal vector. If an unstable contingency occurs, appropriate emergency control actions are triggered so that the enlarged EPDSR can cover the current operating point. Based on these ideas, a mathematics model of emergency control strategy is developed for minimizing its total cost and guaranteeing power system transient stability. The simulation results on the 10-generator, 39-bus New-England Test System as well as other real power systems have shown the validity of this method.

关键词： emergency control, transient stability, EPDSR, critical hyper-plane boundary, experiential law

Principal Quasi-Baerness of Formal Power Series Rings

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第11期26卷 2231-2238页

作者： Zhong Kui liu Wen hui ZHANG Department of Mathematics Northwest Normal University Lanzhou 730070 P. R. China

Let R be a ring. We consider left （or right） principal quasi-Baerness of the left skew formal power series ring R[[x;α]] over R where a is a ring automorphism of R. We give a necessary and sufficient condition under which the ring R[[x; α]] is left （or right） principally quasi-Baer. As an application we show that R[[x]] is left principally quasi-Baer if and only if R is left principally quasi- Baer and the left annihilator of the left ideal generated by any countable family of idempotents in R is generated by an idempotent.

关键词： Left principally quasi-Baer ring skew power series ring right semicentral idempotent