高炉煤气余压发电装置在鞍钢的应用

鞍钢第一台高炉煤气余压发电机组于1993年定货后机组一直闲置，2001年公司开始安装调试，由于该机组闲置时间长，在调试、生产初期出现了一些设备故障，针对这些故障作了分析、处理。     

Numerical Solution of Boussinesq Equations to Simulate Dam-Break Flows

To investigate the effect of nonhydrostatic pressure distribution, dam-break flows are simulated by numerically solving the one-dimensional Boussinesq equations by using a fourth-order explicit finite-difference scheme. The computed water surface profiles for different depth ratios have undulations near the bore front for depth ratios greater than 0.4. The results obtained by using the Saint Venant equations and the Boussinesq equations are compared to determine the contribution of individual Boussinesq terms in the simulation of dam-break flow. It is found that, for typical engineering applications, the Saint Venant equations give sufficiently accurate results for the maximum flow depth and the time to reach this value at a location downstream of the dam.     

Beyond the "Self in Self-Efficacy: Spouse Confidence Predicts Patient Survival Following Heart Failure.

Ratings of patient efficacy to manage illness, made by 191 congestive heart failure patients and their spouses, were examined as predictors of patients' survival over the next 4 years. When considered alone, both the patient's self-efficacy and the spouse's confidence ratings predicted survival, but only spouse confidence remained significant when both partners" efficacy ratings were included in the same Cox regression model. The overlapping prognostic significance of spouse confidence and a global, multicomponent measure of marital quality positioned the former as a proxy for the latter, reflecting a fundamentally social protective factor in patient survival. Successful adaptation to heart failure appears to involve more than the patient's personal agency, and psychosocial data from spouses can improve prediction of patient outcomes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Retardation of Dredged Material Leachate in Foundation Soils

Contaminated dredged material is often placed in confined disposal facilities (CDFs) designed and managed to control environmental impacts of the disposed sediment. This note presents equations for use in a screening procedure to evaluate the impact of a CDF on groundwater. The hydrologic evaluation of leachate production and quality model was used to simulate leachate production and transport through the foundation considering a range of foundation soil characteristics and contaminant properties. The model results were used to develop predictive equations of contaminant attenuation and travel time in the foundation soils. When used with equations to predict dispersion in the aquifer, contaminant exposures at receptor locations can be predicted, which is essential in leachate screening applications. The approach does not consider degradation or permanent sequestration of contaminants. Therefore, the procedure is conservative in that it may overestimate actual leachate concentrations and underestimate actual travel times.     

Is the Context Shift Effect a Case of Retrieval Failure? The Effects of Retrieval Enhancing Treatments on Forgetting Under Altered Stimulus Conditions in Rats.

This series of experiments sought to clarify the role of retrieval failure in forgetting that results from a change in context between training and testing (the context shift effect [CSE]). Because spontaneous forgetting (SF) is generally considered to reflect a retrieval failure, the effects of three manipulations known to alleviate SF were examined on forgetting due to an explicit shift in context at a short delay (24 hr). Pretest exposure to a reminder treatment involving the reinforcer from training (Experiment 1), pretest amphetamine administration (Experiment 2), and overtraining (Experiment 3) alleviated both SF and the CSE, supporting the view that the CSE reflects a retrieval deficit. Implications for the context change account of SF are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

直流绝缘故障检测智能传感器系统

为实现直流供电系统中的绝缘故障检测,研制了一种以AVR单片机为核心的智能传感器系统。该系统利用电磁感应原理检测直流供电系统中电气负载馈电回路的不平衡电流,实现了对电气负载绝缘故障的检测。经过现场测试,该智能传感器系统具有低功耗、高可靠性和易使用的特点,试验结果表明:系统达到了检测准确度要求。     

基于Web网管中故障管理的原理分析与应用

文章对网管的最新发展方向———基于Web网络管理(简称网管)的功能和原理进行了简要介绍,并就网管中关于故障管理的功能需求、故障管理的设计方法及其实现途径,尤其是对故障管理设计中的几个关键问题进行了分析探讨。并且把所研究的设计方法应用于CR8000核心路由器的网管系统中,实践证明,所完成的目标系统是可用的而且是高效的。     

关于液压泵综合应力寿命的探讨

通过对柱塞泵的故障模式及故障机理分析,确定了温度、压力和转速是与敏感应力相关的主要因素,并得出了利用敏感应力可以进行液压泵寿命的验证的结论。最后还分析了液压泵综合应力寿命试验统计方法。     

发生桩基沉降在役压力管道的断裂失效风险分析

含缺陷管道和压力容器的安全评定是石油化工行业中的一个重要课题，断裂力学的出现和发展为它们的安全评定提供了有力的手段。充分考虑工况载荷、缺陷尺寸、断裂韧度、机械强度等参数的不确定性，根据R6双判据准则，通过Monte Carlo模拟方法对发生桩基沉降的管道进行了失效风险分析，得到它的失效概率，对于掌握发生桩基沉降管道的安全可靠性具有一定的实用价值。     

基于分形的滚动轴承故障模式的识别

针对滚动轴承振动信号的特点，从分形原理出发，利用盒维数的概念，对滚动轴承故障产生的非平稳、非线性信号进行了定量描述。试验结果表明，由于滚动轴承不同故障的动力学产生的机制不同，其盒维数明显不同。因此利用盒维数可以准确地识别滚动轴承的故障模式。