质量改进有效性对产品实现过程影响实证研究

为降低企业产品质量危机爆发频率,在对相关质量改进和产品实现过程质量危机影响因素之间作用关系文献进行分析基础上,提出了质量改进有效性对产品实现过程影响假设,并通过变量设计,构建了其概念模型;通过问卷调查获得相应实证研究数据,采用SPSS18.0及AMOS18.0软件对数据分别进行了信度分析和效度检验,并利用结构方程模型证明其概念模型和研究假设的正确性,探讨了产品质量改进有效性对产品实现各过程的作用关系.实证研究结果表明:五个质量改进有效性因素对五个产品实现过程有正影响,同时发现五个产品实现过程因素之间协变性不足,某一方面能力不强时,不会明显减弱其他4个方面的质量危机预控能力,且质量改进有效性五个因素对产品实现各过程的影响程度没有明显差距.研究成果充实了质量改进有效性对产品实现过程的作用关系理论,为企业质量危机预防与预警提供了理论依据.     

模糊综合评价法在企业危机预警中的应用

首先分析了企业危机预警的重要性,然后阐述了企业危机预警的原理和预警工作程序;在模糊评价方法的基础上,提出了基于专家群评价的模糊综合评价方法,通过校正-补偿评价法把专家对企业的评价和对专家评价水平的评价综合起来;最后通过实例说明了这种方法在企业经营危机预警中的具体应用,并对结果进行了分析和讨论.     

网络环境下企业经营危机预警系统研究

基于当前企业或多或少都存在或潜在经营危机的现状,提出一种综合的预警系统评价方法.构建了网络环境下企业危机预警管理系统的总体框架;分析了系统的原理流程,详细设计了各个子系统;建立了子系统的功能模型;阐述了危机评价子系统的实现过程.以此判断企业的经营危机状态,达到预警的目的,帮助企业加强危机防范意识,提高应变危机和防范能力.     

城市水务供水预警机制初探

城市供水在国民经济发展过程中发挥着基础性作用,事关社会的稳定与发展。我国国民经济飞速发展,城市化进度不断提升,用水危机日益加深,供水安全保障这一问题日益突出。建立健全供水预警机制,有效预防应对供水安全问题势在必行。建立供水预警机制对于安全供水提供了可靠的保障,是非常有必要的,在此基础之上本文提出了建立供水预警机制的初步方案以及相关措施。     

模糊多目标决策算法在产品包装质量评估中的运用

产品的包装质量评估体系的评价指标主要有可靠性、方便性、环保性、经济性与艺术性.以这五个指标建立评价矩阵,将模糊多目标决策算法运用于产品的包装质量评估.这种评价方法使得企业能够对产品的包装方案进行定量评价,对包装质量进行有效的评估和管理,并通过实际案例验证了该方法的有效性.     

近红外快速检测烤烟等级质量与关键化学指标的关系

为客观、稳定的评价烤烟等级质量,该文以2017-2018年全国14个省市的烟叶样品为试验材料,以近红外光谱技术快速检测得到的主要化学成分为基础,以外观特征进行分类后的等级作为参照,探究糖氮比、烟碱、氮碱比等关键化学指标与烤烟外观等级质量的关系。结果表明:糖氮比、烟碱、氮碱比与等级质量存在非线性关系;并应用对勾、二次型等非线性分段拟合函数和加权求和的方法,综合糖氮比、烟碱、氮碱比建立基于化学成分的烤烟等级质量评价方法,并验证在烟碱值适中时,糖氮比值越高烤烟等级质量越好的规律。实验表明该文提出的方法模型具有较好稳定性。因此,应用近红外快速检测技术得到的主要关键化学指标可以实现烤烟等级质量客观、稳定的分析评价。     

企业质量信用评价指标体系研究

我国企业质量失信问题频繁发生,通过建立质量信用评价指标体系,评价企业质量信用水平,对预防质量信用风险具有重要意义。本文以中国制造型企业为研究对象进行分析与讨论,提出了建立企业质量信用评价指标体系的方法。该指标体系在意愿、能力、表现3个维度上建立了5个一级指标,同时设计了18个二级测量指标,并在此基础上使用层次分析法计算确认了各级指标的权重数值。     

产品质量危机管理对策实证研究

为克服产品质量危机管理对策系统性提取不足,以便有效指导企业制定产品质量危机管理对策,在对产品质量危机管理对策研究文献进行系统分析基础上,采用元分析法,将不同学者从不同视角定性总结的产品质量危机管理对策进行了系统整理与精炼提纯,得出了理论研究中普遍关注的企业产品质量危机管理对策及其频率分布;采取探索性因子分析法,通过问卷设计,并在选择调查对象基础上,对产品质量危机管理对策进行了引导性调查与数据采集;对获取到的有效调查数据进行了因子分析,提取出了企业产品质量危机预防与预警、应对与控制、恢复与提升三阶段的管理对策,识别出了产品质量危机管理关键对策,并对产品质量危机管理三阶段对策的管理效用进行了讨论.     

基于质量指数的采购质量控制方法研究

质量是企业获取竞争优势的要素之一,采购管理的质量控制将决定企业能否成功地提供优质的产品和服务。文章提出了质量指数（PQI）指标,以反映供应商的产品质量控制能力,并且根据产品质量数据动态的评价供应商的质量控制能力,为企业选择供应商提供有力的依据。     

高碾压混凝土坝智能碾压理论研究

给出了高碾压混凝土坝智能碾压的概念及实现过程,提出了大坝实时监控和智能反馈控制的原理;在实时分析压实指标的基础上,建立了大坝压实质量多元回归模型,进而提出了碾压混凝土坝压实度全仓面实时评价方法;实现了施工过程中碾压机工作性态的自适应调整,确保碾压机速度、激振力、碾压遍数和压实厚度等全过程达标,可有效保证碾压质量,提高施工效率,为碾压混凝土坝建设质量控制提供了一条新的途径。     

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...     

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.     

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.……     

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.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.