橡胶隔振器加速疲劳试验谱的编制方法研究

通过大量的橡胶动静刚度试验和疲劳试验,分别获取了某填充型天然橡胶材料在各试验条件下的动静比数据表和疲劳寿命数据表。以发动机悬置为例,在充分考虑橡胶材料动态特性的基础上,建立了道路载荷值与应变值的转换关系。对采集的道路载荷谱进行雨流计数,根据Miner线性损伤累积理论与损伤等效原则,编制得到最终的加速疲劳试验谱。用该加速疲劳试验谱对发动机悬置进行疲劳试验,试验结果表明：用该方法编制的加速疲劳试验谱可成功应用于悬置等橡胶隔振器零件的疲劳试验,并且较大程度地缩短了试验与产品开发周期。     

工作特征、职业倦怠与工作绩效的关系研究

本文以石化行业员工工作绩效为焦点,探讨工作特征对员工职业倦怠及工作绩效的影响,运用问卷调查法对某石化企业188名操作员工(男147人,女41人)进行调查,结果表明:工作要求(工作环境、工作安全感、身体负荷、设备条件)显著影响职业倦怠中的耗竭和疏离感维度;工作资源(同事支持、上级支持、培训、管理制度)对职业倦怠中的职业效能维度有显著的影响,并通过影响职业效能对关系绩效影响显著;此外工作资源直接对任务绩效有显著的影响;职业倦怠中耗竭和疏离感维度对职业效能维度有负向影响,表明石化行业员工的工作特征对其职业倦怠及工作绩效有良好的预测作用.     

浅谈如何做好计量工作

计量是经济活动、国防建设、科学研究的社会发展的重要基础,渗透到人类活动的各个领域,特别是在提高产品质量和服务质量方面起着十分重要的保证作用,计量在单位生产中起着基础性作用。     

Due Date Assignment in a Multistage Job Shop

In a Materials Requirements Planning (MRP) system, component lead times are generally assumed to be known and constant. Since a requirement of a MRP system is that components finish on time, slack is often built into component lead times to insure that actual job flowtimes equal planned job lead times. In this study, job characteristics and shop characteristics are investigated to determine which has a greater impact on predicting job flowtimes. This is accomplished by determining which characteristic most greatly influences the deviation of planned job lead times from actual job flowtimes. After identifying those factors which have the greatest influence on the job's flowtime, due date assignment rules are developed. A simulation study is then made to determine. which of the due date assignment rules perform best for varying product structures, as defined by various Bills of Materials (BOMs), and various shop conditions. Simulation test results are presented and discussed.     

Control of a Batch Processing Machine Serving Compatible Job Families

We consider the control of a single batch processing machine with random arrivals, random processing times, and compatible job families (jobs from different families may be processed together in the same batch, with the processing time distribution of the entire batch determined by the job family in the batch having the greatest expected processing time). The objective is to minimize the long-run average time that jobs spend in the system. We present properties possessed by the optimal policies and discuss the structure of these policies. We next develop a simple heuristic scheduling policy to control the machine. Simulation results are provided to demonstrate the effectiveness of our heuristic over a wide range of problem instances.     

做好客户服务部工作的思考

文章简要陈述了客户服务部在法定计量检定机构中的重要性,并提出相应的解决方法,更好的为计量事业服务。     

Job shop scheduling with a combination of four buffering constraints

In this paper, a new scheduling problem is investigated in order to optimise a more generalised Job Shop Scheduling system with a Combination of four Buffering constraints (i.e. no-wait, no-buffer, limited-buffer and infinite-buffer) called CBJSS. In practice, the CBJSS is significant in modelling and analysing many real-world scheduling systems in chemical, food, manufacturing, railway, health care and aviation industries. Critical problem properties are thoroughly analysed in terms of the Gantt charts. Based on these properties, an applicable mixed integer programming model is formulated and an efficient heuristic algorithm is developed. Computational experiments show that the proposed heuristic algorithm is satisfactory for solving the CBJSS in real time.     

如何做好合同评审工作

本文主要对做好合同评审工作的几个步骤及注意事项加以论述,并对1999年颁布的IEC／ISO导则25转换为国际标准IEC／ISO作为贯彻评审的依据,谈谈个人看法。签订合同的准确性、完整性以及如何避免争议,达到日臻完善所遵循的依据。     

模块化职务分析

章总结了职务分析方法在我国的应用情况，分析了需求特点，引入模块化的思想，提出了新的职务分析方法——模块化职务分析，认为职务分析的关键就是将工作中的各项任务进行整理，组成不同的工作模块。建立计算机辅助管理系统，时时调整、修改工作模块，对工作模块进行组合，形成职务，从而使职务分析趋于动态化。     

工作重塑对工作绩效作用机制研究:被调节的中介效应

目的基于自我决定理论与工作特征模型,建立并检验工作重塑对工作绩效的被调节的中介效应模型,并对植根于中国文化情境的包容性领导与权威性领导的作用进行对比分析。方法采用Bootstrap、结构方程等方法对来自各类型企业的432名员工样本数据进行统计实证分析。结果实证分析结果表明,工作重塑是员工自我赋能的工作设计方式。工作重塑对其工作绩效产生正向效用,且心理授权赋能在工作重塑与工作绩效间起部分中介作用;包容性领导强化工作重塑对心理授权赋能的作用,并正向调节心理授权赋能的中介作用。与之相对,权威性领导削弱工作重塑对心理授权赋能的作用,并负向调节心理授权赋能的中介作用。结论员工通过工作重塑方式进行自我赋能,进而提升工作绩效。包容性领导与权威性领导在此中介效应过程中起到相反的调节作用。     

Description of particle mixing in a boiling layer by a hyperbolic equation

It is shown that the horizontal diffusion coefficients of particles, which are found from the experimental response functions obtained using the parabolic and hyperbolic diffusion equations, are nearly identical.

     

Job shop control

The paper defines batch or job shop production and reviews the functions of production planning and production control in a job shop manufacturing situation. It argues that the separation of planning and control has resulted in the artificial isolation of the sequencing problem in job shop research. It attempts to redefine the production control function for a job shop, now called job shop control, and discuss the activities it involves. The major decision-making problems associated with job shop control are highlighted and an objective function of costs to aid in management decision making is evolved.     

知识员工工作压力源的主成分因素结构分析

通过对武汉市17家企事业单位596名知识员工工作压力源状况的实证调查分析，探讨了知识员工工作压力源的主要因素结构及其对员工工作压力感的影响。研究结果发现，构成知识员工工作压力源的主要因素分别为：工作任务、职业生涯发展、组织管理、人际关系与能力、时间紧迫性和工作环境等。相关分析和回归分析表明，工作压力源主要因素对工作压力感有显著影响。同时，工作压力源对工作压力感的解释率并不很高，说明工作压力源并非导致工作压力感的惟一因素。     

Description of a curved boundary shape without first derivative discontinuities

For the two-dimensional isoparametric 8-node element an additive condition is formulated, so that the function describing the domain boundary is continually differentiable at the common nodes on the boundary. This condition will be satisfied by moving the mid-side nodes into a special position. The advantage in using this modified element will be shown by an example of the elasto-plastic calculation of a double-edge notched specimen.     

Description and experimental results of a semi-indirect ceramic evaporative cooler

Evaporative cooling is used in industrial and air conditioning processes to reduce temperature in different fluids. Direct evaporation systems can lead to environmental problems such as Legionnaire's disease, and indirect systems reduce system efficiency.This work presents the manufacture, test bed set up and trials carried out on a ceramic evaporative cooling system which acts as a semi-indirect cooler. Depending on air characteristics, it may act as a sensible or enthalpic exchanger. The water cooled in a cooling tower, using the return air coming from the conditioned room (22 °C and 50% comfort conditions) goes through the ceramic pipes, exchanging sensible and latent heat with a current of outdoor air.The use of this recovery system is mainly in climates with a high temperature and humidity such as tropical environments where the system yields a decrease in supply air humidity, using the cooling power of return air.The tests presented show the system behaviour for various supply air conditions.     

一种空间BRDF的编辑算法

双向反射分布函数（BRDF）一直是图形学中物体表面外观表现最通用的方法,空间BRDF是目前最优的一种BRDF,它只比标准RGB纹理多占用很小的存储空间,却达到了更加逼真的效果。但是,SBRDF的获取过程极为复杂和烦琐。该文提出了一种手工编辑SBRDF的算法,它不仅可以处理测量获取的SBRDF纹理,也可以利用标准的数字图像来实现SBRDF并进行更改。最后,通过实例渲染效果展示了该编辑工具的功效。