供应链运作风险影响供应链绩效的实证研究

从实证研究的角度研究了供应链运作风险对供应链绩效的影响.将供应链运作风险归纳为供应风险、需求风险、制造过程风险和信息风险四类,选择供应链可靠性、柔性、服务质量和财务绩效四个变量描述供应链绩效,构建了一个反映二者关系的概念模型.通过对国内制造业企业的问卷调研,利用结构方程模型软件LISREL8.70对模型进行了统计检验,得到了研究结果.研究结果表明:制造过程风险和信息风险对供应链绩效有显著的直接影响;供应风险和需求风险对供应链绩效无显著的直接影响,但通过与制造过程风险和信息风险的相关关系间接影响供应链绩效.研究结论为制造企业实际的供应链风险管理提供理论借鉴.     

逆向供应链合作绩效影响因素的实证研究

对供应链合作的影响因素进行总结,结合逆向供应链合作特点将逆向供应链合作的影响因素分为组织、过程及外部环境三个维度,将合作绩效分为直接绩效与间接绩效,构建了一个反映二者关系的概念模型.通过对相关企业的问卷调研,利用结构方程模型软件LISREL8.70对模型进行了统计检验,得到了研究结果.研究结果表明:影响因素的三个维度对直接合作绩效与间接合作绩效均有直接影响.     

企业内部利益相关者、资源承诺与绿色供应链管理绩效关系

以珠三角地区108家制造型企业为研究对象,对内部利益相关者、资源承诺和绿色供应链管理绩效之间的关系进行实证研究.将资源承诺划分为财务资源和IT资源两个维度,将绿色供应链管理绩效划分为环境绩效和经济绩效两个维度.实证结果表明,内部利益相关者对资源承诺的两个维度有显著的正向影响,且资源承诺的两个维度均对环境绩效和经济绩效均有显著的正向影响;不同规模的企业在资源承诺方面有显著的差异;在绿色供应链管理绩效方面,不同规模的企业在环境绩效上有显著差异,但经济绩效并不存在显著差异性.根据上述实证研究的结论,从宏观和微观角度提出了相关建议.     

供应链设计、供应链整合、信息共享与供应链绩效的关系研究

构建了供应链设计、供应链整合、信息共享及供应链绩效之间关系的理论模型,并以广东省珠三角地区162家制造企业为调查对象,对供应链设计、供应链整合、信息共享及供应链绩效之间的关系进行实证研究。研究结果表明,供应链设计对供应链整合、供应链绩效均有显著的正向影响;供应链设计对信息共享的直接影响并不显著,却会以供应链整合为中介对信息共享产生间接影响;供应链整合对信息共享、供应链绩效有显著的正向影响;而低层次的信息共享对供应链绩效并无显著影响。根据上述实证研究结果,本研究结合中国情境给出了相关管理启示。     

供应链伙伴关系、信息共享与企业运营绩效关系

本文以广东省珠三角地区制造企业为调查对象,对供应链伙伴关系、信息共享与企业运营绩效之间关系进行研究.研究结果表明,供应链伙伴关系对信息共享存在显著的正向影响,即增强供应链伙伴关系将有助于提高企业之间信息共享水平;信息共享对企业运营绩效存在显著的正向影响;供应链伙伴关系不仅直接影响企业运营绩效,而且通过信息共享间接地影响到企业运营绩效.另外,我们还发现在供应链伙伴关系中的信任对信息共享与企业运营绩效均有非常显著的影响.本文研究结论可为我国制造企业实施供应链管理策略提供理论指导.     

供应链管理实施与组织绩效关系实证研究

以重庆、广州等地的企业为调查对象,运用因子分析和结构方程模型,研究高层支持、供应链管理战略、供应链管理实施与组织绩效关系.结果显示,高层支持对供应链管理实施没有显著的直接影响,但它可通过供应链管理战略对供应链管理实施产生显著的间接影响,供应链管理实施对组织绩效有显著的直接正向影响.     

信任关系对IT匹配及信息共享的作用机理研究

构建了制造商与供应商间信任关系、IT匹配、信息共享、制造商运营绩效之间关系的理论模型。通过对广东省珠三角地区272家制造企业进行问卷调查,运用结构方程模型对提出的假设及概念模型进行检验。研究结果显示,能力信任对善意信任有着显著的正向影响;善意信任对信息共享、IT匹配有着显著的正向影响,但能力信任对信息共享、IT匹配的影响并不显著;IT匹配对信息共享和制造商运营绩效都有着显著的正向影响;信息共享对制造商运营绩效有着显著的正向影响。研究表明,企业不仅要通过加强对IT匹配的投资来改善信息共享及运营绩效,还要善于建立供应链伙伴间信任关系来提高信息共享及运营绩效水平。     

物流信息能力对供应链绩效影响的实证研究

构建了物流信息能力、配送能力和柔性能力与供应链服务质量、响应性和财务绩效的关系模型,利用结构方程模型进行了检验.研究结果表明,物流信息能力对供应链绩效没有直接影响,但是可以通过配送能力和柔性能力的影响,而影响供应链服务质量以及最终的财务绩效,而且物流信息能力还通过显著影响配送能力极大地影响了供应链的响应性.     

供应链管理实施与组织绩效的关系实证分析

构建了一个描述供应链管理实施及其驱动因素与组织绩效间关系的理论模型,选择西南和华南等地区的企业为调查对象,收集了177个样本数据,以LISREL8.70和SPSS11.5软件包对样本数据进行因子分析.结构方程模型拟合优度评估以及假设检验结果表明:供应链管理实施对组织绩效有显著直接影响;信息技术不仅对供应链管理实施有显著直接影响,而且还通过供应链管理战略对其产生显著间接影响.     

基于平衡记分卡的供应链绩效评价体系构建

从物流效率、计划及执行能力、企业战略及组织间的协调能力、以及信息技术应用能力等4个维度,构建了企业供应链绩效的评价体系,在此基础上,设计出供应链绩效平衡记分卡,并且利用调研数据对记分卡的信度和效度进行了检验.研究结果表明:该记分卡通过了信度检验和效度检验,因而能够可靠而有效地对企业的供应链绩效进行评价.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.