影响碾压混凝土层间结合质量的因素及改进措施

碾压混凝土重力坝采用平层分层摊铺、分层碾压的施工方式,突出地存在层间结合问题,如处理不当,将影响坝体的稳定。本文对影响碾压混凝土层间结合质量的因素进行了分析,并提出了改进措施。     

压缩机环状阀故障树及模糊评判组合分析

探讨了将故障树分析和模糊综合评判分析相结合，建立组合分析法对压缩机环状阀进行可靠性分析的方法和过程。根据有关文献中给出的故障树分析结果，进行了实际分析计算。实际应用表明，将故障树及模糊综合评判用于压缩机环状阀的可靠性分析及评价是可行的。     

从水沙条件探讨黄河下游上下河段冲淤调整关系

在以往对黄河下游河道上段(高村以上)和下段(高村到利津)冲淤调整关系研究的基础上，通过1960～1999年422场次洪水资料的统计分析，按三门峡水库不同运用期分析了上下段的冲淤关系，建立了上下段排沙比与水沙系数的关系，认为上下段冲淤关系随水沙搭配条件而变：水流严重不饱和时上下段冲淤性质一致；轻度不饱和情况下上下段冲淤性质相反；水沙搭配基本平衡时上下段冲淤变化不大。根据上下段冲淤临界水沙系数关系绘制了上下段冲淤关系图，并首次按三黑小(三门峡、黑石关、小董三站)水沙搭配进行了定量分区：上冲下淤、上淤下冲、上下皆冲和上下皆淤区。     

Deficient Strategic Control of Verbal Encoding and Retrieval in Individuals With Methamphetamine Dependence.

Methamphetamine (MA) dependence is associated with deficits in episodic verbal memory, but the cognitive mechanisms underlying such impairments are not known. The authors evaluated a component process model of episodic verbal memory in 87 persons with MA dependence (MA+) and 71 demographically similar non-MA-using controls (MA-). Compared with MA- controls, MA+ participants demonstrated deficient overall learning, free recall, and utilization of semantic clustering, as well as higher rates of repetitions and intrusions. No between-groups differences were evident on measures of serial clustering, retention, or recognition discrimination. Taken together, these findings indicate that MA dependence is associated with deficient strategic (i.e., executive) control of verbal encoding and retrieval, which is consistent with the sequelae of MA-related prefronto-striatal circuit neurotoxicity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

新型抗温抗盐降滤失剂FHJ-10的研制

以AM、ClCH2COOH及AMPS等为单体,并复合高温稳定剂D(主要成分为柠檬酸盐),制备了一种新型抗温抗盐降滤失剂FHJ-10,并对其性能进行了评价.实验结果表明,降滤失剂FHJ-10的抗温性能可以达到130 ℃,抗盐可达到25%,具有良好的应用前景.     

多束激光相位共轭偏振合成技术的实验研究

进行了多束激光相位共轭偏振合成研究。种子激光源使用的是Cr4 + ∶YAG被动调Q 的扭转模激光器,分束/ 合束是通过使用偏振片来实现,最终实现了三路激光的基于相位共轭的偏振合成,指标为重频10Hz ,脉冲能量150mJ ,脉宽4ns ,M2 为116。     

Improvement of the non-destructive evaluation of plasma facing components by data combination of infrared thermal images

To increase the reliability of non-destructive examinations of plasma facing components (PFC), we present steps in order to make data combination in this study. The industrial issue is the inspection of manufacturing quality of these components which must support a very high-heat flux in Tokamaks. The experimental study was conducted on trial components for the Wendelstein 7X stellarator using two benches of infrared thermal imaging equipment. The first bench measures the surface temperature with an internal excitation of the components. The second bench uses a lock-in thermal imaging method. The data fusion method makes use of the Dempster–Shaffer theory of evidence. We show that we can improve the decision making for the quality diagnostic. This study could be generalized to other combinations of non-destructive tests for current Tokamaks or those under development like the future ITER reactor.     

苏丹混合原油复配型降凝剂研制

苏丹三七区各油田所产原油高蜡、高胶质、高黏、高凝.外输油采用加剂加热处理工艺,经φ181.3 mm、长1367 km 管道输送至苏丹港.加剂量大,降凝降黏效果不佳.实验外输油烷烃碳数分布范围C6～C36,C26和C17～C16处有2个峰值,在DSC曲线上有2组析蜡点和析蜡峰59℃和56℃,42℃和35℃.从八大类商品降凝剂中未筛选出可用的剂种.研制了由2种EVA、一种高分子量聚丙烯酸高级醇酯、一种具强极性基的三元共聚物及胶质沥青质改性剂组成的复配降凝剂SL2.加剂量1.0 g/L的该荆使实验外输油凝点由39℃降至30℃.35℃、13 1/s黏度降至843 mPa·s,35℃稠度系数降至40.0 Pa·sn,流动指教接近1(1.156).DSC分析及显微研究表明该剂不改变原油析蜡点和析蜡峰温,可使析出的蜡晶变细小.按现场管榆工艺,考察三次加剂(1.0、1.0、0.5 g/L)的降凝降黏效果,认为接转站和中心处理站热处理温度可由105℃降为95℃,在4号泵站则由65℃升至80℃.对于加剂原油的凝点和流变性,管流剪切影响较小,过泵剪切影响很大,温度越低则影响越大.图6表5参2.     

Determining loss characteristics of arid zone river waterbodies

Understanding the retention time of water in waterbodies during periods of no surface flow in dryland rivers provides an important context for evaluating the ecological importance of a waterhole to the river system. Time series of water level data were collected from 10 waterbodies spread across three river systems of the Lake Eyre Basin (LBE), Australia. Observed loss rates in the absence of surface flow were compared to modelled evaporation rates in order to determine whether open water evaporation was the main loss process from isolated waterholes and to what extent there is evidence of interaction between the surface water and any shallow groundwater aquifers. The modelled evaporation rates were determined using the Penman combination equation and meteorological data from the closest climate station in the region of the waterbodies. The modelled evaporation data were able to explain only some of the variability in the observed loss data but did highlight periods where other processes (including observation error) need to be invoked. These other possible processes, which include temporary groundwater connection and the effect of heat storage on the evaporation losses, probably contribute as much to the observed data variability as error introduced by the use of regional meteorological data. Assuming evaporation is the dominant process determining water loss in the absence of flow, the persistence of a waterhole is primarily dependent upon its depth when flow ceases. The annual loss shown by most waterbodies lies within the range of the modelled evaporation rate using the Penman combination equation and equates between 1.5 and 2.5 m per annum. The use of water level data in conjunction with the modelled evaporation rates was able to provide important insights into controls on waterbody loss rates and persistence. Copyright © 2007 John Wiley & Sons, Ltd.     

一种Rake结构的TDOA估计器及其最优合并方法

TDOA估计技术已被广泛应用于多种定位系统中，其估计误差主要来源于系统中的多径效应。传统的估计方法不适合复杂的多径环境。许多面向定位的系统均采用了回避措施来降低多径的影响，蜂窝定位系统受其特性的制约，在目前的结构下无法采用相应的回避措施。为了满足蜂窝系统需求，本文提出了一种基于Rake结构的TDOA估计器，分析了它在多径环境中的误差性能，证明了在归一化Rake合并下，估计器可获得最优性能。计算机仿真证明了理论分析的正确性和实用性。