循环水泵反转监测系统的安装、调试及改进分析

介绍某核电厂循环水系统循环水泵反转监测系统的测量原理、系统组成,分析反转监测系统的安装、调试经验及运行过程中出现的问题,探讨反转监测系统及其相关控制逻辑的改进,使反转监测系统与现场设备的实际工艺状态相匹配,以便进一步对其进行优化.     

酯类液晶化合物的研究新进展

酯类液晶是近年来广泛应用于高端电子产品的液晶材料.简要评述了酯类液晶的合成进展,并详细讨论了近几年国内外酯类液晶的合成方法及性能,并对其应用前景进行了展望.     

加料方式对共沉淀法制备的Cu/MnO/Al2O3催化剂性能的影响

采用共沉淀法制备Cu/MnO/Al₂O₃催化剂,运用N₂吸附-脱附、XRD、XRF和H₂-TPR等对其进行表征,并用于乙酸甲酯加氢制乙醇反应,考察共沉淀加料方式对催化剂结构及其催化性能的影响。结果表明,共沉淀时采用的加料方式显著影响制备的Cu/MnO/Al₂O₃催化剂的织构性质、CuO晶粒大小、还原性能和化学组成,这些因素共同作用决定了催化剂在乙酸甲酯加氢反应中的催化性能。其中,反加法制得的催化剂Cu和Mn组分含量相对比值接近理论值,且具有较高的比表面积和较佳的还原性能,因而表现出最佳的催化性能,在反应温度200 ℃、压力6.5 MPa、空速0.6 h^-1和氢酯物质的量比50条件下,乙酸甲酯转化率和乙醇选择性分别达98.9%和98.1%。     

A method for exploring the effects of attrition in randomized experiments with dichotomous outcomes.

Attrition from conditions in randomized experiments is common. Yet it is difficult to assess the possible effects of attrition because the outcome status of the dropouts is usually unknown. This article develops methods to assess those effects in studies with dichotomous outcomes, illustrating the methods with randomized experiments in drug abuse treatment, smoking cessation treatment, and alcoholism treatment. The methods include computing the lowest and highest possible effect sizes that could have been observed, enumerating the percent of possible study outcomes below a given threshold, estimating the probability that an outcome beyond any given threshold would be observed if all participants were measured, and constructing attrition analysis plots showing the effects of attrition under varied assumptions. For the kind of study to which they apply, these methods should replace the treatment of missing participants as failures in an "intent-to-treat" analysis. A user-friendly personal computer program is available to implement all of these analyses. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A measurement-theoretic analysis of the fuzzy logic model of perception.

The fuzzy logic model of perception (FLMP) is analyzed from a measurement-theoretic perspective. FLMP has an impressive history of fitting factorial data, suggesting that its probabilistic form is valid. The authors raise questions about the underlying processing assumptions of FLMP. Although FLMP parameters are interpreted as fuzzy logic truth values, the authors demonstrate that for several factorial designs widely used in choice experiments, most desirable fuzzy truth value properties fail to hold under permissible rescalings, suggesting that the fuzzy logic interpretation may be unwarranted. The authors show that FLMP's choice rule is equivalent to a version of G. Rasch's (1960) item response theory model, and the nature of FLMP measurement scales is transparent when stated in this form. Statistical inference theory exists for the Rasch model and its equivalent forms. In fact, FLMP can be reparameterized as a simple 2-category logit model, thereby facilitating interpretation of its measurement scales and allowing access to commercially available software for performing statistical inference. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

十堰市水土流失防治对策探讨

湖北省十堰市是南水北调中线工程的水源区，由于自然条件和人为因素，该市是湖北省水土流失最为严重的区域。为确保南水北调中线工程水源区的水质安全，必须加强水土流失防治工作治理中要明确目标，长远规划，全面推进。     

新型环保型增塑剂柠檬酸三丁酯合成的研究进展

介绍无毒增塑剂柠檬酸三丁酯的性能、用途、合成原理与生产工艺流程.对催化合成柠檬酸三丁酯的研究进行综述,通过比较分析得出,开发新型的固体酸催化剂将对柠檬酸三丁酯的合成研究及工业化起到促进作用,并展望了其发展前景.     

空气间隙击穿后放电通道内的气体运动特性

空气间隙击穿后放电通道内气体的运动关系着间隙绝缘强度的恢复,而绝缘强度的恢复程度对输电线路因间隙放电而跳闸后的重合闸成功与否具有决定性的影响.该文采用高速纹影技术,获得棒-板空气间隙击穿后放电通道演化过程的纹影图像,并基于光流法获得了间隙击穿后放电通道内气体速度场的时空分布.观测结果表明:间隙击穿后放电通道内气体运动的...     

埕岛油田馆陶组高含水期优势流动通道识别与应用

河流相沉积的砂岩油藏注水开发进入了高含水期,平面、层面矛盾进一步凸显,水驱效果差,识别和治理优势流动通道是开发中急需解决的问题。以埕岛油田主体馆陶组中一区油藏为例,综合采用指标计算法、吸水产液图版法、动态分析等方法对优势流动通道进行研究,形成了一套快速识别优势流动通道的综合评价方法;在流动通道识别基础上,明确调整方向,采取油水井两端并重的"提、控、引"治理措施,引导地下流场扩大波及面积,均衡流场,取得了良好的现场应用效果,对指导下步馆陶组注水开发具有重要的意义。