土壤固化剂在尾矿干堆适用性试验研究

为了探究不同类型土壤固化剂在尾矿干堆应用的可行性,选取了有机类（A:环氧树脂E51+环氧树脂固化剂W93与B:环氧树脂E51+环氧树脂固化剂T31）、无机类（C:水玻璃+氯化钙与D:水玻璃+五水硫酸铜+硫酸铝钾）与生物酶类（E:FRT与F:DS）固化剂开展室内试验,对固结后的硬度指标进行测试,并对固化剂的抗高温性能、抗风性能与抗水性能进行试验研究。结果表明:喷洒固化剂的砂模表层会形成一定硬度的壳体;所有固化剂的抗高温效果良好;喷洒了C、D固化剂的砂模在风吹后的质量损失率较其余固化剂的大;B、F的抗水性能在所有固化剂中的效果最好。     

三囊袋封堵器处置钻孔漏气技术研究

为了对瓦斯抽采钻孔周围的裂隙进行有效封堵,建立钻孔漏气圈模型,提出带压注浆一次封孔与漏气处置二次封孔相结合的技术方法,研制出一种既具有封孔又具有漏气处置功能的三囊袋封堵器装置,并进行了现场工业试验。结果表明:该装置成功实现了封孔和漏气处置的一体化操作,能够有效减少漏气圈面积,钻孔瓦斯浓度提高了25%～177%,抽采效果显著提高。     

稻米来源镉对生长期猪的生长特性及不同脏器组织镉蓄积的影响

环境中的镉污染对动植物及人类都带来了极大的危害。目前,多数镉毒理研究关注其无机状态,而来源于稻米的有机态镉的毒害作用报道较少。为评估稻米来源镉对生长期猪的毒性作用,选用初始体重为30 kg左右的健康生长猪28头,随机分为体重无明显差异的2组,即对照组与稻米来源镉组(试验组),研究稻米来源镉对生长期猪(生长及育肥全阶段)的生长特性及不同脏器组织镉蓄积的影响。结果表明,在生长及育肥阶段,试验组与对照组相比:1)生长特性无显著差异(P0.05);2)育肥期组织游离氨基酸含量,除肌肉中的赖氨酸显著降低外(P0.05),血浆、肝脏、肾脏及肌肉中其他游离氨基酸水平均无显著差异(P0.05);3)心脏、肝脏、脾脏、肾脏、肺脏、胃、小肠、大肠、骨骼中镉蓄积量显著增高(P0.05),而肌肉、血液中无显著差异(P0.05),脂肪、皮中未检出镉。日粮使用大比例镉超标稻米后镉在各脏器和组织中的蓄积规律为肾脏肝脏小肠脾肺大肠胃血液骨头心腿肌背肌脂肪、皮。由此可见,镉超标稻米对生长期猪的生长特性未产生显著的影响,稻米来源镉主要蓄积于肝脏和肾脏,而主流食用组织肌肉和血液中镉的蓄积量较少。     

发酵制药废水二级出水中溶解性有机物特性分析

溶解性有机物（DOM）是发酵制药废水二级生化尾水深度处理工艺的主要去除对象,深入解析废水中DOM的特性是将其有效去除的前提和关键.本研究采集氨基酸类、头孢类、抗生素类、维生素类、阿维菌素类5种发酵制药废水二级出水,通过XAD-8树脂亲疏水性分离、凝胶色谱分子量分级、傅里叶变换红外光谱和三维荧光表征对二级出水中的DOM进行特性分析.结果表明,5种发酵制药废水二级出水的盐度和色度高,废水中有机物浓度高、波动大（48.60~245.40 mg·L^-1）.DOM大多数以疏水性组分为主,分子量分布广泛（210~10000 Da）.二级出水DOM均含有大量的不饱和双键、苯环结构,同时含有—OH、—NH₂和C=O等发色团和助色基团,造成废水色度较高.通过对发酵制药废水二级出水进行EEM-PARAFAC分析确定了4种荧光组分特征峰,包括3种腐殖质类（C1、C3、C4）和1种类蛋白类组分（C2）.发酵制药废水二级出水中DOM主要是以类腐殖质有机物为主（C1、C3）.全方面识别和解析发酵制药废水DOM的组成,可为废水深度处理工艺的优化提供指导.     

Human Performance Cognitive-Behavioral Modeling: A Benefit for Occupational Safety

Human Performance Modeling (HPM) is a computer-aided job analysis software methodology used to generate predictions of complex humanautomation integration and system flow patterns with the goal of improving operator and system safety. The use of HPM tools has recently been increasing due to reductions in computational cost, augmentations in the tool’s fidelity, and usefulness in the generated output. An examination of an Air Man-machine Integration Design and Analysis System (Air MIDAS) model evaluating complex human-automation integration currently underway at NASA Ames Research Center will highlight the importance to occupational safety of considering both cognitive and physical aspects of performance when researching human error.     

A Study of Computer-Based Task Performance Under Thermal Stress

A visual-visual dual computer task was designed to test the effect of the thermal environment on dual task performance. The temperatures selected for testing were 20 and 35 °C Wet Bulb Globe Temperature (WBGT). 34 volunteers were randomly assigned to 1 of the 2 temperature conditions. Individual differences in single task performance were controlled by equating the baselines of single task performance. Once individual differences in single task capacity were controlled, statistically significant differences in performance were demonstrated. Mean accuracy was computed over a 1-hr testing period in each temperature condition. Participants’ mean accuracy in the 35° condition (38.18%) was substantially lower than in the 20° condition (50.88%).     

The Influence of Anchor Devices on the Performance of Retractable Type Fall Arresters Protecting Against Falls From a Height

Retractable type fall arresters are part of the equipment used for protecting people against falls from a height. They are an intermediate part between full body harness worn by a man and the structural anchor at the worksite. The most important task of retractable type fall arresters is to arrest people’s falls and to reduce their harmful consequences. Information received from users as well as laboratories testing protective equipment indicates that the performance of such equipment is incorrect under specific conditions. The paper is concerned with an analysis of the conditions in which retractable type fall arresters demonstrate intermittent performance and with an explanation of that phenomenon. The results of tests investigating anchor devices and the performance of retractable type fall arresters are presented. External and internal factors contributing to intermittent performance have been determined and guidelines for safer use of these devices have been developed.     

Participative Versus Assigned Production Standard Setting in a Repetitive Industrial Task: A Strategy for Improving Worker Productivity

Abstract

The participative standard with feedback condition was superior to the assigned difficult (140% of normal) standard with feedback condition in terms of worker productivity. The percentage increase in worker productivity with the participative standard and feedback condition was 46%, whereas the increase in the assigned difficult standard with feedback was 23%, compared to the control group (no standard, no feedback). Worker productivity also Improved significantly as a result of assigning a normal (100%) production standard with feedback, compared to the control group, and the increase was 12%. The participative standard with feedback condition emerges as the optimum strategy for improving worker productivity in a repetitive industrial production task.     

When does centrality matter? Scientific productivity and the moderating role of research specialization and cross‐community ties

The present study addresses the ongoing debate concerning academic scientific productivity. Specifically, given the increasing number of collaborations in academia and the crucial role networks play in knowledge creation, we investigate the extent to which building social capital within the academic community represents a valuable resource for a scientist's knowledge‐creation process. We measure the social capital in terms of structural position within the academic collaborative network. Furthermore, we analyse the extent to which an academic scientist's research specialization and ties that cross‐community boundaries act as moderators of the aforementioned relationship. Empirical results derived from an analysis of an Italian academic community from 2001 to 2008 suggest academic scientists that build social capital by occupying central positions in the community outperform their more isolated colleagues. However, scientific productivity declines beyond a certain threshold value of centrality, hence revealing the existence of an inverted U‐shaped relationship. This relationship is negatively moderated by the extent to which an academic focuses research activities in few scientific knowledge domains, whereas it is positively moderated by the number of cross‐community ties established. Copyright © 2012 John Wiley & Sons, Ltd.     

Positive affectivity neutralizes transformational leadership's influence on creative performance and organizational citizenship behaviors

This study uses an interactionist approach to examine the moderating effect of follower trait positive affectivity (trait PA) on the relation between transformational leadership and both follower creative performance and organizational citizenship behaviors (OCB). On the basis of responses from 212 employees and their direct supervisors from the research and development department of a company in Mainland China, results support the hypothesized moderation effect. Specifically, the positive influence of transformational leadership on creative performance was significantly reduced for followers who were higher on trait PA (ΔR² = .02, p < .05). The same pattern, in which followers' trait PA appeared to substitute for the influence of transformational leadership, generalized to the outcome of follower OCB as well (ΔR² = .04, p < .01). We discussed theoretical and practical implications of these findings. Copyright © 2012 John Wiley & Sons, Ltd.