A frame-based knowledge representation model and its mapping to nested relations

The first part of this paper introduces the basic constructs of a frame representation model and gives a formal definition for them. Subsequently the nested relational model (NF²) is described as an extension of the classical relational model to support relation-valued attributes. In the second part of this paper both models are compared with each other and a mapping of frame representation structures to NF² structures is specified. The structural similarities between frames and NF² relations are made clear and it is shown that their main difference is due to the type polymorphism introduced by the concept hierarchy of the frame model. This causes type collisions to occur in the strictly typed NF² model when frames are directly mapped to NF² structures. Two solutions to this problem are suggested and compared. The paper concludes with a reformulation of query operations of the frame model in terms of NF² algebra operations.     

滚动转子式压缩机传热模拟

就滚动转子式压缩机的传热特性进行了分析。把压缩机分为15块，视摩擦损失和电机发热为内热源，考虑润滑油流动在传热过程中的影响，应用集中参数法对每块进行了能量分析，建立了传热数学模型并进行了计算。     

广东电力特种光缆存在的问题及解决方法

分析了广东电力系统特种光缆应用在工程建设、运行维护等方面出现的问题，以及对电网保护等业务的影响，提出了解决办法和方案，特别是从电网安全运行角度去理解ADSS电腐蚀问题，以及近期广电集团的具体措施。     

VPI粉云母带的选型试验研究

为电机主绝缘VPI工艺选择合适的粉云母带，对几种真空压力浸渍(VPI)用云母带进行了试验研究，分析了选型原则，同时对比了几种粉云母带的性能。将它们应用于模拟线棒中，线棒的试验数据表明：选出的两种云母带的配合可获得优异的性能，达到优等品标准水平。再将少胶云母带应用于电机整机试验，试验结果表明达到了减薄绝缘、降低温升、延缓绝缘老化、提高电机使用寿命的目的。     

Delay discounting of real and hypothetical rewards.

The degree to which real and hypothetical rewards were discounted across delays ranging from 6 hr to 1 year was explored in a within-subjects design. An adjusting-amounts procedure was used to estimate the subjective value of real and hypothetical rewards at each delay. A hyperbolic discounting function provided a significantly better fit to individual participants' preferences than did an exponential function. No significant effect of reward type on degree of hyperbolic discounting or area under the discounting curves was detected. These findings offer some support for the validity of using hypothetical rewards to estimate discounting rates in substance-abusing and other populations, but caution is suggested because this support is gleaned from a failure to detect an effect of reward type. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Question hard, answer simply: A comment on Storms et al. (2003).

It seems clear that, for whatever reasons, the dementia of the Alzheimer type patient group (as well as other patient groups) exhibits behavior that is different from the normal control group. G. Storms, T. Dirikx, J. Saerens, S. Verstraeten, and P. P. De Deyn (2003) rightfully argue that the observed behavior (similarity judgments) does not tell us the source (cause) of the differences between the 2 groups. Rather, the focus of the study should be placed more on finding the ways the 2 groups are different. They also point out various methodological problems in some of the previous attempts to characterize the nature of the differences. Further methodological issues in G. Storms et al.'s study are examined. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

炉台紧急吹扫故障判断方法

通过对炉台设备的简介及紧急吹扫的统计分析,提出了判断紧急吹扫故障的合理方法,提高了故障的准确判断率,减少了对生产的影响。     

新型水力泵排液工艺

酸化或压裂是改造油气层措施中常规的也是最有效的方法之一。问题是酸化或压裂结束后,采取何种工艺及时返排出残酸,减少残液二次沉淀对油层的污染。同时常规TCP(油管传输负压射孔)+DST(地层测试器)二联作测试工艺在遇到低压、低渗等非自喷油层时,要想取准油层产能、压力,收集到有代表性产液样品资料,困难很大。针对以上问题,大港油田钻采院研制了新型水力喷射泵,该泵可与酸化、压裂及射孔+测试等工艺配套使用,在实现一趟施工管柱同时完成几项工作的同时,利用喷射泵深抽、连续强排的技术特点,取得了较好效果。     

利用C++Builder 5.0开发原理框图绘图软件

介绍了原理框图各种图形的数据存储方法，利用C^ Builder5.0开发了原理框图的绘图软件，实现了原理框图绘制的基本功能。     

Simulation by Slepian method of plastic displacements of Gaussian process excited multistory shear frame

The object of study is a stationary Gaussian white noise excited multi-degree-of-freedom (MDOF) linear elastic, ideal plastic, linearly damped, statically determinate oscillator with several potential elements of ideal plastic yielding. Specifically the study is exemplified for a plane multistory shear frame with rigid traverses where all the connecting columns except the columns in one or more of the bottom floors have finite symmetrical yield limits. The white noise excitation acts on the mass of the first floor making the movement of the elastic bottom floors simulate a ground motion that interacts with the structure above the bottom floors. The method of study is so-called Slepian model simulation and is in principle the same for other statically determinate MDOF elasto-plastic oscillators of the considered type. The method is fast as compared to direct simulation and provides results that give good insight in the behavior of the plastic displacement response process.