混合控制网络在低温多效海水淡化中的应用

以海水淡化布液装置的自动控制系统为研究基础,建立了Profibus-DP现场总线、工业以太网(Profinet)、标准以太网(TCP/IP)的混合网络远程监控系统;实现了与现场设备进行连接的设备层,高速数据处理和数据交互的控制层,以及具有冗余控制功能的信息层的三层式网络控制结构。研究结果表明:该网络控制系统运行稳定可靠,适用于多台海水淡化装置的分散控制、集中管理系统,对中大型海水淡化装置远程监控网络的组建具有较高的参考价值。     

An empirical examination of the mechanisms mediating between high-performance work systems and the performance of Japanese organizations.

The resource-based view of the firm and social exchange perspectives are invoked to hypothesize linkages among high-performance work systems, collective human capital, the degree of social exchange in an establishment, and establishment performance. The authors argue that high-performance work systems generate a high level of collective human capital and encourage a high degree of social exchange within an organization, and that these are positively related to the organization's overall performance. On the basis of a sample of Japanese establishments, the results provide support for the existence of these mediating mechanisms through which high-performance work systems affect overall establishment performance. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Process modification for coating SnO2:F on stainless steels for PEM fuel cell bipolar plates

Our previous procedure for depositing SnO₂:F on stainless steels for interfacial contact resistance (ICR) reduction and as a protective coating for metal bipolar plates was modified by pre-etching and coating characterization. Only ferrite stainless steels acquired a good quality SnO₂:F coating. The modified SnO₂:F coating decreased the ICR over our previous coating results, confirming the beneficial effect of the pre-etching; however, the corrosion resistance we obtained was significantly reduced.     

The psychological refractory period: Evidence for age differences in attentional time-sharing.

Reports 2 psychological refractory period (PRP) experiments in which the stimulus onset asynchrony (SOA) between Task 1 and 2 was 150, 250, 600, and 1,100 msec for both younger and older adults. H. Pashler's (1994) response-selection bottleneck theory predicts that SOA manipulations should not affect Task 1 performance, but that reaction time (RT) for Task 2 should increase as the SOA between the 2 tasks decreases (i.e., the classical PRP effect). In Exp 1, older adults showed a larger PRP effect, although Task 1 RT was affected by SOA, suggesting that Ss were grouping their responses on some trials. That is, Ss were holding their response for Task 1 until they had completed processing Task 2, and then they responded to both tasks almost simultaneously. However, a subset of Ss who showed no evidence of response grouping on Task 1 continued to show a larger PRP effect for older adults on Task 2. In Exp 2, older adults continued to show a larger PRP effect for Task 2, and Task 1 performance was unaffected by SOA. Findings provide evidence that older adults exhibit a decrement in time-sharing at the response-selection stage of processing. Results suggest that attentional time-sharing needs to be added to the list of topics examined in aging research on varieties of attention. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The influence of metal ions on the conductivity of Nafion 112 in polymer electrolyte membrane fuel cell

Nafion 112 membranes were soaked in 1 M H₂SO₄ solutions containing variable amounts of Fe and Cr ions, either individually or mixed. An even distribution of the metal ions on the surface of the membranes was observed with electron probe microanalysis (EPMA) mapping. The proton conductivity of the soaked membranes was investigated using a conductivity cell. For Fe ions, the conductivity was almost constant until the Fe-ion solution concentration reached 300 ppm. Over the 300-ppm threshold, the conductivity decreased significantly. Similar results were obtained with Cr ions in the membrane, but here the threshold was approximately 200 ppm in the solution. Mixed metal ions were found to decrease these threshold values due to the additive effect of the two metals.     

Electro-oxidation of methanol on copper in alkaline solution

The electro-oxidation of methanol on copper in alkaline solutions has been studied by the methods of cyclic voltammetry, quasi-steady state polarization and chronoamperometry. It has been found that in the course of an anodic potential sweep the electro-oxidation of methanol follows the formation of Cu^III and is catalysed by this species through a mediated electron transfer mechanism. The reaction also continues in the early stages of the reversed cycle until it is stopped by the prohibitively negative potentials. The process is diffusion controlled and the current-time responses follow Cottrellian behavior. The rate constants, turnover frequency, anodic transfer coefficient and the apparent activation energy of the electro-oxidation reaction are reported.     

陕甘宁盆地延长组地下流体压力分布及油气运聚条件研究

本文在泥岩压实曲线基础上,利用平衡深度法计算得出了陕甘宁盆地南部中生代地层的流体压力分布。研究区各井下部均发育有稳定的过剩压力,其中长7油组的幅度普遍较高。延长组各油组过剩压力平面分布的格局具明显继承性。研究区的西北灵武—盐池—带过剩压力最发育,东南葫芦河—洛河一带次之,而东北与西南则较差。过剩压力分布与已知含油情况分布的关系表明,绝大部分油田与产油井段在平面上均分布在相应油组过剩压力低值带,纵向上主要分布在正常压力段,其次为异常压力段中的相对低值带。据此探讨了延长组主力生油层长7油组油气的运移及聚集条件,并指出研究区内有两个有利聚集地带。一是在灵武—盐池与葫芦河—洛河高压带之间的靖边—吴旗—庆阳及其西南一带;二是研究区东缘安塞—富县一线及其以东地区。     

计算机接口电路抑制干扰的方法探讨

当干扰电平达到或超过有用信号电平时，计算机系统将不能正常工作。本文对抑制干扰的方法进行了探讨。     

固体超强酸S_2O_8~(2-)/ZrO_2催化合成硬脂酸月桂酯

对固体超强酸S_2O_8~(2-)/ZrO_2催化合成硬脂酸月桂酯进行了研究。催化剂用量为0.01g/mL,反应温度为128℃,反应时间为8 h,硬脂酸月桂酯的产率可达 75％。S_2O_8~(2-)/ZrO_2的催化活性高于SO_4~(2-)/ZrO_2,在0.5 mol/L(NH_4)_2S_2O_8溶液中按15 mL/g比例浸渍 Zr(OH)_4,过滤后于600 ℃下焙烧3 h,得到的催化剂活性最高。