高压共轨硬件在环仿真系统与试验研究

构建了高压共轨电控燃油喷射系统在环仿真系统,建立了柴油机模型,对高压共轨电控燃油喷射系统试验装置进行硬件在环仿真试验测试,试验结果表明：该仿真系统试验平台在保证控制系统精度的基础上,能够准确地实现电喷柴油机性能要求,缩短了产品开发周期,降低了开放费用,为高压共轨系统的配机和测试提供了有效途径,具有工程借鉴作用。     

关于微型齿轮尺度界定的讨论

微型齿轮并非传统宏观齿轮的简单几何缩小,当齿轮微小化后将面临微尺度效应的难题.提出微尺度应该与微尺度效应相对应,对微型齿轮的尺度进行界定,并按尺度对微型齿轮进行分类的观点.以前人的试验和研究的结论为依据,探索将微尺度划分为微小尺度、微细尺度、微纳尺度、超微纳尺度.对渐开线标准直齿圆柱微型齿轮进行尺度界定,按尺度将微型齿轮分为微小齿轮、微细齿轮、微纳齿轮、超微纳齿轮,指出各类微型齿轮在研究设计时应主要考虑微尺度效应.     

非正弦条件下无功功率定义分析与展望

非正弦电路中,有功功率定义已被公认,无功功率的定义却一直还没有定论。本文描述了在非正弦波形下有关无功功率的三种定义,其一是时域分析法,其二是频域分析法,其三是三相电路瞬时无功功率;对已提出的一些无功功率定义做了详细的分析和评述;最后总结了新的无功功率理论应该满足的要求。     

海上油田早期聚合物驱历史拟合方法

早期聚合物驱无水驱或水驱的时间短,在动态历史拟合过程中,储层物性参数与聚合物物化参数的调整往往交织在一起,使得数值模拟的多解性问题更加突出.为解决该问题,按照早期聚合物驱现场实施的2种情况分别采取相应的历史拟合方法.对于先实施先导试验再进行扩大聚合物驱的情况,首先充分利用扩大注聚区的水驱阶段数据修正储层物性参数,然后利用修正后的地质模型进行聚合物参数拟合,最后将得到的聚合物参数应用于先导试验区或者没有注水就开始注聚的区块,进而修正储层参数以拟合生产动态.对于早期聚合物驱无注水阶段的情况,建议首先根据类比法或经验法,对岩心实验测定的聚合物参数进行修正,然后在储层参数可调范围内,最大范围地调整储层物性参数进行动态拟合;若无法拟合,再调整聚合物参数进行动态拟合,若有实际聚合物返排参数,可以先调整聚合物参数,再调整储层参数.将上述方法应用于渤海某油田,含水率拟合的成功率达90%以上.     

用拟合曲线进行产量历史变化分析

我国大多数油田已出现产量递减现象,产量递减分析在油田生产中的重要性日益明显,传统的产量递减模型在计算和预测方面比较繁琐。以生产历史数据数理统计为基础,确定出5种产量变化的历史拟合模型。现场应用表明,这几种模型能够很好地实现生产数据历史拟合,对产量预测精度的提高也有很大的帮助。     

Football Predictions Based on a Fuzzy Model with Genetic and Neural Tuning

A model is proposed for predicting the result of a football match from the previous results of both teams. This model underlies the method of identifying nonlinear dependencies by fuzzy knowledge bases. Acceptable simulation results can be obtained by tuning fuzzy rules using tournament data. The tuning procedure implies choosing the parameters of fuzzy-term membership functions and rule weights by a combination of genetic and neural optimization techniques. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 171–184, July–August 2005.     

Application and modelling of flow forming manufacturing processes for internally geared wheels

The production of internally geared wheels by flow forming is a new process developed at the PtU Darmstadt. The technology enables manufacturing in one-piece design without additional machining operation. In this process, an externally geared mandrel is fitted into a cup-like work piece. By reducing the cup's outside diameter, the inner wall of the cup is rolled into the mandrel's teeth, thereby producing the gear's profile. Three tooling concepts with different kinematics and numbers of rolls were analyzed using experimental methods. Numerical analyses revealed several shortcomings of available finite-element codes to handle complex flow forming processes. The first step of an efficient computation is the development of a parameterized process model. This is able to act as a starting basis for a virtual product and process design.     

宝钢炼铁技术进步

对宝钢在调整原燃料结构、降低原燃料成本、提高和稳定高炉产能、降低炼铁能耗等方面所做的工作进行了总结。通过优化高炉操作参数，燃料比和工序能耗不断降低。     

A growing bottleneck: The internship supply-demand imbalance in 2007 and its impact on psychology training.

This article provides a comprehensive analysis of the growing imbalance between the supply of predoctoral internship positions in psychology and the demand for such positions by graduate students. Data from the 2007 Match sponsored by the Association of Psychology Postdoctoral and Internship Centers (APPIC) are provided along with the results from several surveys of applicants from that year. An overview of applicant and program participation for the nine APPIC Matches that occurred between 1999 and 2007 is also provided. Implications of the increasing supply-demand imbalance for applicants, graduate and internship programs, and the profession are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Changes in the International System of Units proposed in recommendation E1 (2007) of the consultative committee on electricity and magnetism

Changes in the definitions of the technical units and units of electromagnetism in the International System of Units which may be adopted if Recommendation E1 (2007) is approved are discussed. It is shown that the verbal statement of the definition of the kilogram may be radically simplified if the division of units into fundamental and derived units is discarded in the new International System of Units. __________ Translated from Izmeritel’naya Tekhnika, No. 8, pp. 69–71, August, 2007.