期刊文献+
共找到3,267篇文章
< 1 2 164 >
每页显示 20 50 100
Solution for Output Coordination Equations of Several Typical Parallel Six-Dimensional Acceleration Sensing Mechanisms
1
作者 ZHANG Xianzhu YOU Jingjing ZHANG Yuanwei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第S01期96-102,共7页
Aiming at the problem that it is difficult to generate the dynamic decoupling equation of the parallel six-dimensional acceleration sensing mechanism,two typical parallel six-dimensional acceleration sensing mechanism... Aiming at the problem that it is difficult to generate the dynamic decoupling equation of the parallel six-dimensional acceleration sensing mechanism,two typical parallel six-dimensional acceleration sensing mechanisms are taken as examples.By analyzing the scale constraint relationship between the hinge points on the mass block and the hinge points on the base of the sensing mechanism,a new method for establishing the dynamic equation of the sensing mechanism is proposed.Firstly,based on the scale constraint relationship between the hinge points on the mass block and the hinge points on the base of the sensing mechanism,the expression of the branch rod length is obtained.The inherent constraint relationship between the branches is excavated and the branch coordination closed chain of the“12-6”configuration is constructed.The output coordination equation of the sensing mechanism is successfully derived.Secondly,the dynamic equations of“12-4”and“12-6”configurations are constructed by the Newton-Euler method,and the forward decoupling equations of the two configurations are solved by combining the dynamic equations and the output coordination equations.Finally,the virtual prototype experiment is carried out,and the maximum reference errors of the forward decoupling equations of the two configuration sensing mechanisms are 4.23%and 6.53%,respectively.The results show that the proposed method is effective and feasible,and meets the real-time requirements. 展开更多
关键词 six-dimensional acceleration sensor parallel mechanism topological configuration coordination equation dynamics
下载PDF
Study on the Coordination Mechanism Between Higher Vocational Students’Career Development Planning and School Management
2
作者 Jian Li 《Journal of Contemporary Educational Research》 2024年第7期204-209,共6页
The coordination mechanism between the career development planning of vocational students and the management of vocational colleges is an important means to improve the quality of education and students’vocational co... The coordination mechanism between the career development planning of vocational students and the management of vocational colleges is an important means to improve the quality of education and students’vocational competitiveness.The application of synergy theory in the field of education emphasizes the interaction and coordination of various elements in the system and pursues the optimization of overall efficiency.Based on the theory of coordination and its relevance to the management of higher vocational colleges,this paper analyzes the current development status and problems of the coordination mechanism and puts forward the strategy of building an efficient coordination mechanism designed to enhance the students’employment competitiveness,promote the all-round development,and provide theoretical and practical support for the reform and development of higher vocational education. 展开更多
关键词 Vocational college management Career development planning coordination mechanism Synergy theory Safeguard measures
下载PDF
On Incentive and Coordination Mechanism of Service Outsourcing Based on Principal-Agent Theory and Blockchain Technology
3
作者 Chenglong Yan Xiao Wang +1 位作者 Xiaonan Zhang Ruzhi Xu 《Journal of Artificial Intelligence and Technology》 2023年第1期1-9,共9页
To address the issue of information asymmetry between the two parties and moral hazard among service providers in the process of service outsourcing,this paper builds the Stackelberg game model based on the principal-... To address the issue of information asymmetry between the two parties and moral hazard among service providers in the process of service outsourcing,this paper builds the Stackelberg game model based on the principal-agent framework,examines the dynamic game situation before the contract being signed,and develops four information models.The analysis reveals a Pareto improvement in the game’s Nash equilibrium when comparing the four models from the standpoint of the supply chain.In the complete information scenario,the service level of the service provider,the customer company’s incentive effectiveness,and the supply chain system’s ultimate profit are all maximized.Furthermore,a coordinating mechanism for disposable profit is built in this study.The paper then suggests a blockchain-based architecture for the service outsourcing process supervision and a distributed incentive mechanism under the coordination mechanism in response to the inadequacy of the principal-agent theory to address the information asymmetry problem and the moral hazard problem.The experiment’s end findings demonstrate that both parties can benefit from the coordination mechanism,and the application of blockchain technology can resolve these issues and effectively encourage service providers. 展开更多
关键词 service outsourcing coordination mechanism distributed incentive mechanism blockchain
下载PDF
Supply chain coordination mechanisms under asymmetric information with retailer cost disruptions 被引量:7
4
作者 庄品 赵林度 《Journal of Southeast University(English Edition)》 EI CAS 2007年第4期620-625,共6页
A two-level supply chain model involving one supplier and one retailer with linear demand is developed, and supply chain coordination mechanisms under asymmetric information (the retailer' s cost structure is asymme... A two-level supply chain model involving one supplier and one retailer with linear demand is developed, and supply chain coordination mechanisms under asymmetric information (the retailer' s cost structure is asymmetric information) are proposed by employing game theory in two scenarios: coordination mechanisms under asymmetric information in a regular scenario (without disruption); and coordination mechanisms under asymmetric information in an irregular scenario ( with retailer cost disruptions). It is optimal for the supply chain to maintain the original production plan and to guarantee a steadily running system if variations of retailer costs are sufficiently low and do not exceed an upper bound. This shows that the original production plan has certain robustness under disruptions. Decisions must be re-made if a retailer' s cost change is greater and exceeds an upper bound. Impacts of retailer cost disruptions on the order quantity, the retail price, the wholesale price and each party' s as well as the system' s expected profits are investigated through numerical analyses. 展开更多
关键词 disruption management supply chain coordination mechanism asymmetry information game theory cost disruption
下载PDF
Combination of Nitrogen-Rich Skeleton and Coordination Group:Synthesis of a High-Energy Primary Explosive Based on 1H-Tetrazole-5-Carbohydrazide
5
作者 Tingwei Wang Zujia Lu +6 位作者 Shu Bu Baolong Kuang Lu Zhang Zhenxin Yi Kun Wang Shunguan Zhu Jianguo Zhang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第1期271-277,共7页
The high energy coordination compounds Cu(TZCA)_(2)(ClO_(4))_(2)(ECCs-1) was prepared by 1H-tetrazole-5-carbohydrazide(TZCA) with a high energy skeleton and a strong coordination ability group.At the same time,the rea... The high energy coordination compounds Cu(TZCA)_(2)(ClO_(4))_(2)(ECCs-1) was prepared by 1H-tetrazole-5-carbohydrazide(TZCA) with a high energy skeleton and a strong coordination ability group.At the same time,the reaction activity of the ligand was explored,and the single crystal structure of it and intermediate were obtained.The structures of all substances were characterized by IR and EA.And the structure and composition of ECCs-1 are confirmed by ESP,AC,SEM and ICP-OES.Physical and chemical properties tests show that ECCs-1 has an acceptable thermal stability(T_(d)=177℃) and extremely sensitive mechanical stimulation(IS=1 J,FS=5 N).The comprehensive performance test results show that ECCs-1 has excellent initiation ability.In addition,the decomposition mechanism of ECCs-1 is explored from two aspects of experiment and theoretical calculation. 展开更多
关键词 1H-tetrazole-5-carbohydrazide Primary explosive Decomposition mechanism coordination polymers Laser
下载PDF
Regarding the Regulatory Sandbox Route and Mechanism for Governance of Artificial Intelligence
6
作者 Ye Xuanhan 《科技与法律(中英文)》 CSSCI 2024年第5期136-148,共13页
The main challenge in AI governance today is striking a balance between controlling AI dangers and fostering AI innovation.Regulators in a number of nations have progressively extended the regulatory sandbox,which was... The main challenge in AI governance today is striking a balance between controlling AI dangers and fostering AI innovation.Regulators in a number of nations have progressively extended the regulatory sandbox,which was first implemented in the banking sector,to AI governance in an effort to reduce the conflict between regulation and innovation.The AI regulatory sandbox is a new and feasible route for AI governance in China that not only helps to manage the risks of technology application but also prevents inhibiting AI innovation.It keeps inventors'trial-and-error tolerance space inside the regulatory purview while offering a controlled setting for the development and testing of novel AI that hasn't yet been put on the market.By providing full-cycle governance of AI with the principles of agility and inclusive prudence,the regulatory sandbox offers an alternative to the conventional top-down hard regulation,expost regulation,and tight regulation.However,the current system also has inherent limitations and practical obstacles that need to be overcome by a more rational and effective approach.To achieve its positive impact on AI governance,the AI regulatory sandbox system should build and improve the access and exit mechanism,the coordination mechanism between the sandbox and personal information protection,and the mechanisms of exemption,disclosure,and communication. 展开更多
关键词 artificial intelligence governance regulatory sandbox agile regulation inclusive prudential regulation access and exit mechanism coordination mechanism
下载PDF
SIMULTANEOUS POLYMERIZATION AND FORMATION OF POLYPHENYLACETYLENE FILMS BY RARE-EARTH COORDINATION CATALYSIS Ⅳ.KINETICS AND MECHANISM OF POLYMERIZATION 被引量:1
7
作者 赵健 杨慕杰 +1 位作者 刘敏 沈之荃 《Journal of Rare Earths》 SCIE EI CAS CSCD 1990年第3期176-182,共7页
The CO_2 quenching method has been used for the first time to determine the active complex concen- tration in Nd(naph)_3-Al(i-Bu)_3 catalyst system for polymerization of phenylacetylene into polyphenylacetylene(PPA)fi... The CO_2 quenching method has been used for the first time to determine the active complex concen- tration in Nd(naph)_3-Al(i-Bu)_3 catalyst system for polymerization of phenylacetylene into polyphenylacetylene(PPA)films.The kinetics and mechanism of this polymerization have been investigated by CO_2 quenching and IR,UV analytical methods.The kinetic equation can be expressed as Rp=k[M][Cp],and the apparent activation energy is about 13.6 kJ/mol.There is self-termination of chain propagating.Models for formation of the active complex and polymerization mechanism are proposed. 展开更多
关键词 Nd AI SIMULTANEOUS POLYMERIZATION AND FORMATION OF POLYPHENYLACETYLENE FILMS BY RARE-EARTH coordination CATALYSIS KINETICS AND mechanism OF POLYMERIZATION
下载PDF
Coordination mechanism of developing unification of urban agglomeration: A case study of south Sichuan urban agglomerations
8
作者 LONG Zhi ZENG Shao-lun 《Ecological Economy》 2016年第3期269-276,共8页
With the expansion of the urbanization, the urban agglomeration is forming in the region and showing a unification trend. The development of urban agglomeration and its unification depends on the coordination of the d... With the expansion of the urbanization, the urban agglomeration is forming in the region and showing a unification trend. The development of urban agglomeration and its unification depends on the coordination of the division of labor. It is significant to the further development of urban agglomeration that the coordination mechanism was constructed. Taking the south Sichuan urban agglomerations(SSUA) as an example, the research analyzes the current situation and problems of cities' unification, studies the industrial distribution layout and designs the framework of the regionally coordinated development. Then the author constructs the coordination mechanism of urban agglomeration development and presents strategies for the coordinated development of urban agglomeration and its unification. 展开更多
关键词 urban agglomeration cities’ unification coordinating mechanism
下载PDF
Research on Coordination Mechanism in Construction Project Organization 被引量:1
9
作者 Chen Shouke Cheng Hu Wei Zhuobin 《工程科学(英文版)》 2006年第3期100-110,共11页
The construction process of modern project is distributed across teams, departments, or systems, each of which is corresponding to a particular project unit. Conflicts often occur in construction project organization ... The construction process of modern project is distributed across teams, departments, or systems, each of which is corresponding to a particular project unit. Conflicts often occur in construction project organization because of the improper coordination amongbetween these project units. The primary reason for coordination puzzle in project organization is generally the diversification of culture and technology. In order to enhance the organization’s performance efficiency, good and effective coordination mechanism aimed at diversification of culture and technology is needed. The relationship amongbetween parties and project units is defined and expressed through contract, so construction project organization usually relies on various contracts to deal with its cooperative partner relationship. However, the contractual mode is a defensive method which is more prone to conflicts than the conglomerate of diversification, especially evaluated from the aspects of culture and value. By culture integration—a more flexible way to make up the shortage of contractual mode, a harmonious atmosphere in which organization members can exert their potential ability can be created to help project administrators mitigate organization conflicts and achieve the common goals of project organization. Based on arbitration theory, moreover, this paper puts forward a combined coordination mechanism-hierarchical coordination and nonhierarchical coordination—to resolve the conflicts resulted from diversification of technology. The introduction of intelligent agents system has the advantage of a more systematic and organizational method in reality without causing unnecessary emotional and the behavioural side effects is an effective instrument to utilize this coordination mechanism and realizes its established goals. 展开更多
关键词 工程项目 项目管理 调和机制 合同保护 文化冲突 技术冲突 协调模式 文化多样化
下载PDF
A Comprehensive Evaluation Framework of Water-Energy-Food System Coupling Coordination in the Yellow River Basin,China 被引量:4
10
作者 YIN Dengyu YU Haochen +3 位作者 LU Yanqi ZHANG Jian LI Gensheng LI Xiaoshun 《Chinese Geographical Science》 SCIE CSCD 2023年第2期333-350,共18页
For mankind’s survival and development,water,energy,and food(WEF)are essential material guarantees.In China,however,the spatial distribution of WEF is seriously unbalanced and mismatched.Here,a collaborative governan... For mankind’s survival and development,water,energy,and food(WEF)are essential material guarantees.In China,however,the spatial distribution of WEF is seriously unbalanced and mismatched.Here,a collaborative governance mechanism that aims at nexus security needs to be urgently established.In this paper,the Yellow River Basin in China with a representative WEF system,was selected as a case.Firstly,a comprehensive framework for WEF coupling coordination was constructed,and the relationship and mechanism between them were analyzed theoretically.Then,we investigated the spatiotemporal characteristics and driving mechanisms of the coupling coordination degree(CCD)with a composite evaluation method,coupling coordination degree model,spatial statistical analysis,and multiscale geographic weighted regression.Finally,policy implications were discussed to promote the coordinated development of the WEF system.The results showed that:1)WEF subsystems showed a significant imbalance of spatial pattern and diversity in temporal changes;2)the CCD for the WEF system varied little and remained at moderate coordination.Areas with moderate coordination have increased,while areas with superior coordination and mild disorder have decreased.In addition,the spatial clustering phenomenon of the CCD was significant and showed obvious characteristics of polarization;and 3)the action of each factor is self-differentiated and regionally variable.For different factors,GDP per capita was of particular importance,which contributed most to the regional development’s coupling coordination.For different regions,GDP per capita,average yearly precipitation,population density,and urbanization rate exhibited differences in geographical gradients in an east-west direction.The conclusion can provide references for regional resource allocation and sustainable development by enhancing WEF system utilization efficiency. 展开更多
关键词 water-energy-food(WEF) comprehensive framework coupling coordination relationship driving mechanism Yellow River Basin China
下载PDF
Effect of fluoride ions on coordination structure of titanium in molten NaCl–KCl 被引量:1
11
作者 Shanshan Liu Shaolong Li +2 位作者 Chenhui Liu Jilin He Jianxun Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第5期868-876,共9页
The effects of fluoride ions(F^(-)) on the electrochemical behavior and coordination properties of titanium ions(Ti^(n+)) were studied in this work,by combining electrochemical and mathematical analysis as well as spe... The effects of fluoride ions(F^(-)) on the electrochemical behavior and coordination properties of titanium ions(Ti^(n+)) were studied in this work,by combining electrochemical and mathematical analysis as well as spectral techniques.The α was taken as a factor to indicate the molar concentration ratio of F^(-) and Ti^(n+).Cyclic voltammetry(CV),square wave voltammetry(SWV),and open circuit potential method(OCP)were used to study the electrochemical behavior of titanium ions under conditions of various α,and in-situ sampler was used to prepare molten salt samples when α equal to 0.0,1.0,2.0,3.0,4.0,5.0,6.0,and 8.0.And then,samples were analyzed by X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy.The results showed that F^(-) in molten salt can reduce the reduction steps of titanium ions and greatly affects the proportion of valence titanium ions which making the high-valence titanium content increased and more stable.Ti^(2+) cannot be detected in the molten salt when α is higher than 3.0 and finally transferred to titanium ions with higher valence state.Investigation revealed that the mechanism behind those phenomenon is the coordination compounds(TiCl_(j) F_(i)^(m-)) forming. 展开更多
关键词 molten salt sodium chloride–potassium chloride ratio of fluoride and titanium ions coordination mechanism
下载PDF
The homogenous growth of Co-based coordination compound on graphene nanosheet for high-performance K-organic battery and its reaction mechanism
12
作者 Qian-Qian Peng Yi-Ting Wang +3 位作者 Shuo Qi Yao Xiao Yong Wang Shuang-Qiang Chen 《Rare Metals》 SCIE EI CAS CSCD 2024年第4期1622-1634,共13页
Metal coordination compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected t... Metal coordination compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected to intrinsic features of the sluggish ionic diffusion coefficient,low electronic conductivity and slow kinetics.Herein,a new MCC material of cobalt-1,3,5-trioxy-2,4,6-triamino-benzo(Co-TB)coordination compound was synthesized and homogenously grown on the surface of graphene nanosheets(GNS),forming a Co-TB@GNS composite with enhanced electronic conductivity and flexible capability.Benefiting from the overall enhanced conductivity,high surface area and abundant activated K-storage sites,Co-TB@GNS electrodes have exhibited superior cycling performance with high reversible capacities(312 mAh·g^(-1)after 100 cycles at 100 mA·g^(-1),224 mAh·g^(-1)after 500 cycles at 1 A·g^(-1))and better rate performances compared with the pure Co-TB compound when served as PIB's anodes.Furthermore,multiple in-situ measurement techniques have jointly confirmed that the organic functional groups(C=O,C=N and C=C of benzene rings)and Co^(2+)in Co-TB are the main reversible K-storage sites,including in-situ Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD),and partial capacity contribution is originated from GNS by the apparent K-storage behavior in the in-situ XRD pattern,proving the possibility of K-storage for metal-organic materials. 展开更多
关键词 Metal coordination compounds Potassiumion battery Cobalt coordination compound K-storage mechanism
原文传递
Determination of the workspace of a new coordinate-measuring machine using parallel-link mechanism
13
作者 刘得军 黄庆成 +2 位作者 叶东 车仁生 周琳 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2001年第2期147-154,共8页
Presents the detailed algorithm established for determination of workspace for a 3-DOF coordinate measuring machine using parallel link mechanism by constructing the inverse kinematic model first and then reviewing th... Presents the detailed algorithm established for determination of workspace for a 3-DOF coordinate measuring machine using parallel link mechanism by constructing the inverse kinematic model first and then reviewing the physical and kinematical constraints from the structural characteristics of the parallel link mechanism, and discusses the actual geometries of workspace and the factors having effect on workspace through computer simulation thereby providing necessary theoretical basis for the research and development of coordinate measuring machines using parallel link mechanism. 展开更多
关键词 coordinate measuring machine WORKSPACE parallel link mechanism three degrees of freedom spatial coordinate
下载PDF
Study on the Influence of the Coordinated Development of Resident Income and GDP on Local Economic Development:Take Shandong Province as an Example
14
作者 Yamin Sun 《Proceedings of Business and Economic Studies》 2024年第4期195-201,共7页
With the rapid development of China’s economy,the coordinated development of resident income and GDP has become an important indicator to measure local economic development.How to realize the synergistic growth of th... With the rapid development of China’s economy,the coordinated development of resident income and GDP has become an important indicator to measure local economic development.How to realize the synergistic growth of the two in the new era is of great significance for promoting the sustainable development of the local economy.Based on the theory of the coordinated development of resident income and GDP,this paper will take Shandong Province as an example to analyze the interaction between resident income growth and GDP,find out the influencing factors that restrict the coordinated development of resident income and GDP,and explore the impact of the coordinated development of resident income and GDP on local economic development.Finally,relevant policies will be studied.How to effectively increase residents’income,promote the sustainable and healthy development of the local economy,and put forward relevant suggestions to promote the coordinated development of residents’income and GDP. 展开更多
关键词 Household income Gross domestic product coordinated development Influence mechanism
下载PDF
Protect Sick Prisoners' Rights Through Regulation and Innovation——Chengdu launches coordinating mechanism for sick prisoners with major diseases
15
作者 WANG XIAOBING, YAN HUAJU AND FU SHAOHUA 《The Journal of Human Rights》 2012年第5期5-7,共3页
In May 2011, the Prison Management Bureau of Sichuan Province in Southwest China held a conference in its capital city Chengdu to discuss the management of severely sick prisoners. Coordinating Management on Major Dis... In May 2011, the Prison Management Bureau of Sichuan Province in Southwest China held a conference in its capital city Chengdu to discuss the management of severely sick prisoners. Coordinating Management on Major Diseases of Sick Prisoners in Sichuan (Trial) was issued then, marking the start of an overall deployment. 展开更多
关键词 Protect Sick Prisoners Rights Through Regulation and Innovation Chengdu launches coordinating mechanism for sick prisoners with major diseases
下载PDF
Hydrothermal in situ Ligand Synthesis from 1,10-Phenanthroline-5,6-dione and Characterization of 1D Coordination Polymers [Co(bpdc)(H_2O)_3]·H_2O and [Cu(bpy)V_2O_6] 被引量:1
16
作者 WANG Xiu-li BI Yan-feng LIN Hong-yan LIU Guo-cheng 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第3期250-253,共4页
Hydrothermal treatment of MCl2 ( M = Co or Cu ) , NH4 VO3, and 1,10-phenanthroline-5,6-dione (pdon) resulted in the formation of a duplex coordination polymer [ Co ( bpdc ) ( H2O ) 3 ] · H2O ( bpdc = 2,2... Hydrothermal treatment of MCl2 ( M = Co or Cu ) , NH4 VO3, and 1,10-phenanthroline-5,6-dione (pdon) resulted in the formation of a duplex coordination polymer [ Co ( bpdc ) ( H2O ) 3 ] · H2O ( bpdc = 2,2'-bipyridine-3,3'-dicarboxylate) and a chain-like coordination polymer [ Cu (bpy) V2O6 ] ( bpy = 2,2'-bipyridine ). X-ray single-crystal structural analysis shows that under hydrothermal conditions and in the presence of different transition metals, the organic reagent pdon was transformed in situ into bpdc and bpy, respectively. Mechanism of the in situ ligand synthesis reaction has been discussed. 展开更多
关键词 Hydrothermal synthesis In situ Ligand synthesis coordination polymer mechanism
下载PDF
Application of canonical coordinates for solving single-freedom constraint mechanical systems 被引量:1
17
作者 高芳 张晓波 傅景礼 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2014年第8期1029-1038,共10页
This paper introduces the canonical coordinates method to obtain the first integral of a single-degree freedom constraint mechanical system that contains conserva-tive and non-conservative constraint homonomic systems... This paper introduces the canonical coordinates method to obtain the first integral of a single-degree freedom constraint mechanical system that contains conserva-tive and non-conservative constraint homonomic systems. The definition and properties of canonical coordinates are introduced. The relation between Lie point symmetries and the canonical coordinates of the constraint mechanical system are expressed. By this re-lation, the canonical coordinates can be obtained. Properties of the canonical coordinates and the Lie symmetry theory are used to seek the first integrals of constraint mechanical system. Three examples are used to show applications of the results. 展开更多
关键词 canonical coordinates first integral Lie symmetry constraint mechanical system
下载PDF
Kinetic Studies on Axial Coordination Reaction of Tetraphenylporphinatocobalt(Ⅱ) Chloride 被引量:1
18
作者 XIA Xin(Dept. of Chem., Beijuig Sci & Tech,Univ. , Beijing, 100083 )ZHU Zhi-ang and CHEN Yun-ti(Dept.of Chem., Nanlai University , Tianjin, 30007 1 ) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1994年第3期211-219,共9页
he axial coordination reactions of tetraphenylporphinatocobalt (Ⅲ) chloride(Co TPPC1) with various imidazoles RIm ( HIm . imidazole; Melm , 2-methylimida-zole) were investigated in acetone and dichloromethand so... he axial coordination reactions of tetraphenylporphinatocobalt (Ⅲ) chloride(Co TPPC1) with various imidazoles RIm ( HIm . imidazole; Melm , 2-methylimida-zole) were investigated in acetone and dichloromethand solvents at different temper-atures. The reaction mechanisms were proposed and the differences between experi-mental results in the two solvents h ave been interpreted using the proposed mecha-nisms and rate equations for the first time , and the reaction scheme for the axial re-action of the metalloporphyrin has been developed. Hydrogen bonding plays an im-portant role in the reactions. The effects of various imidazoles for these reactionsand the solvents are reported. The comparison between iron and cobalt porphyrinsin the kinetics are discussed. 展开更多
关键词 PORPHYRIN Axial coordination reaction . Kinetics . mechanism
下载PDF
Mg_2(OH)_2CO_3·3H_2O Whiskers Growth Mechanism 被引量:1
19
作者 吴健松 高义民 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第3期509-514,共6页
From the perspective of growth units, the growth mechanism of Mg2(OH)2CO3.3H2O whisker is investigated in this paper. Results show that the growth morphology of Mg2(OH)2CO33H2O whisker is consistent with the model... From the perspective of growth units, the growth mechanism of Mg2(OH)2CO3.3H2O whisker is investigated in this paper. Results show that the growth morphology of Mg2(OH)2CO33H2O whisker is consistent with the model of anion coordination polyhedron growth units. The growth solution Raman shift of Mg2(OH)2CO;3H2O was monitored using Raman spectroscopy. The growth units are [Mg-(OH)4]2- and H2COv The growth process of Mg2(OH)2COf3H2O whisker is as follows: growth unit [Mg-(OH)4]2- first incorporates into the larger dimension [Mg-(OH)4]2-, then the [Mg-(OH)4]2-n combines with H2CO3 into a linear skeleton Mg2(OH)2CO3 in the same line. Mg2(OH)2CO3 combines with H2O by hydrogen bonds and ultimately transforms into Mg2(OH)2COf3H2O whisker. Magnesium carbonate whiskers have a layered structure, each of which is made of magnesium, carbon, oxygen, with H2O in between each layer. When skeletons are superimposed within the same plane as a parallelepiped one, they grow into solid cuboid-shaped whiskers. When the parallelepiped skeletons planes combine with each other through the cascading links, they grow into hollow cylindrical whiskers. 展开更多
关键词 Mg2(OH)2CO3.3H2O whisker model of anion coordination polyhedron growth units growth mechanism
下载PDF
A Dynamic Job Shop Scheduling Method Based on Ant Colony Coordination System 被引量:1
20
作者 朱琼 吴立辉 张洁 《Journal of Donghua University(English Edition)》 EI CAS 2009年第1期1-4,共4页
Due to the stubborn nature of dynamic job shop scheduling problem,a novel ant colony coordination mechanism is proposed in this paper to search for an optimal schedule in dynamic environment.In ant colony coordination... Due to the stubborn nature of dynamic job shop scheduling problem,a novel ant colony coordination mechanism is proposed in this paper to search for an optimal schedule in dynamic environment.In ant colony coordination mechanism,the dynamic job shop is composed of several autonomous ants.These ants coordinate with each other by simulating the ant foraging behavior of spreading pheromone on the trails,by which they can make information available globally,and further more guide ants make optimal decisions.The proposed mechanism is tested by several instances and the results confirm the validity of it. 展开更多
关键词 ant colony behavior coordination mechanism dynamic job shop scheduling
下载PDF
上一页 1 2 164 下一页 到第
使用帮助 返回顶部