汽车排气污染浓度预测

运用空气质量模式的基本理论，研究汽车尾气排放的扩散规律。选用多种典型空气质量模式，对汽车污染进行计算机模拟。在每一模式下，可对大气稳定度，混合层高度、扩散参数等进行选择计算；并能进行瞬时浓度及长期浓度的预测。设计的程序适用于各种气象务件、各种道路条件、各种车型。     

分层分布式区域电能质量监测系统设计

电能质量直接关系到电力系统的安全运行和用户的用电安全与经济。在阐述电能质量监测的重要性的基础上 ,设计了一个分层分布式的电能质量监测系统 ,该系统结构合理、功能完善。采用高速的DSP芯片设计的监测前置单元保证了数据采集的速度和可靠性。整个系统还需要在应用过程中逐步完善     

ISO 9000 versus CMM: Standardization and certification of IS development

A growing number of software developers use standards as a basis for their quality systems. Some of them go one step further and have their quality systems certified. In this paper, two well-known quality standards, ISO 9000 and the CMM, are compared. It is concluded that both standards are useful but there is a growing need for more specific standards.     

建设项目的投资工期和质量控制

根据监理工作实践，论述了投资、工期和质量的控制，提出控制工期是保证投资效益的重要途径，控制质量是保证工程投资的有效手段；设计阶段是投资控制的重要环节。     

Monitoring of multivariable dynamic processes and sensor auditing

Industrial continuous processes are usually operated under closed-loop control, yielding process measurements that are autocorrelated, cross correlated, and collinear. A statistical process monitoring (SPM) method based on state variables is introduced to monitor such processes. The statistical model that describes the in-control variability is based on a canonical variate (CV) state space model. The CV state variables are linear combinations of the past process measurements which explain the variability of the future measurements the most, and they are regarded as the principal dynamic dimensions. A T² statistic based on the CV state variables is utilized for developing the SPM procedure. The CV state variables are also used for monitoring sensor reliability. An experimental application to a high temperature short time (HTST) pasteurization process illustrates the proposed methodology.     

二阶RLC滤波电路品质因数推导中的巧合

给出几种二阶RLC滤波电路在一般文献分析时定义的品质因数,由品质因数的能量定义,分别求出了这几种电路的品质因数,所求结果却与文献在分析时定义的品质因数不相符。若按电源等效定理,将电源进行等效变换,变换后电路的品质因数却与文献分析时定义的相同。但电源等效是外等效,即对电源外部电路等效,对电源本身并不等效,经电源等效变换前后电路并不等效,由变换后电路所得的品质因素不应当为原电路的品质因素,这是1种巧合。     

无功和电压质量

针对电网的特点,浅谈电力系统电压和无功功率的重要作用及几种控制技术的应用。     

小型材轧后双线高效冷却系统的研制与应用

针对济钢第一小型轧钢厂产量大幅度提高后,冷床能力严重不足对产量和质量的不利影响,经过反复的实验和研究,采用了"轻穿水、低过冷、小温差"的冷却原理,研制和应用了一种新型的棒材在线轧后双线高效穿水冷却系统,明显降低钢材上冷床温度,解决了钢材速冷后内部不良组织的产生和明显不同组织形态的相互渗透对焊接性能的不利影响,使得焊接后焊口热影响区的性能与未焊接基材区域的性能相同,解决了以往"强过冷、高温差"淬火式冷却方式存在的问题.     

Index for quality control in anthropometric surveys

In an anthropometric measurement process, there are many factors which are error sources even if the observers are highly trained. Systematic or bias errors are possible and they are not clearly noticeable. In this work we propose two simple and adimensional indices to use in the quality control of anthropometric surveys.

Such indices are applicable only to a few anthropometric variables but the results found by this control can be an indication of the quality of the complete measurement process. The indices are defined as

and ses index is the same when the measures are obtained in sitting position. The observer must take those measurements again when the index values are higher than a selected threshold value before approving or rejecting the measure.

Relevance to industry

Anthropometric data are used in a wide variety of consumer products and in processes of industrial design. Wrong precision of data could cause problems in the industrial products. Those indices are useful to improve the accuracy and quality control of data.     

Perturbation Analysis of Multiclass Stochastic Fluid Models

We use a stochastic fluid model (SFM) to capture the operation of finite-capacity queueing systems with multiple customer classes. We derive gradient estimators for class-dependent loss and workload related performance metrics with respect to any one of several threshold parameters used for buffer control. These estimators are shown to be unbiased and directly observable from a sample path without any knowledge of underlying stochastic characteristics of the traffic processes. This renders them computable in on-line environments and easily implementable in settings such as communication networks.