The efficiency of electrocoagulation in treating wastewater from a dairy industry,Part I: Iron electrodes

Iron electrodes were used for electrocoagulation (EC) treatment of wastewater from a dairy plant. Electrolysis time, pH, current density and distance between electrodes were considered to assess the removal efficiency of chemical oxygen demand (COD), total solids (TS) and their fractions and turbidity. Samples were collected from the effluent of a dairy plant using a sampling methodology proportional to the flow. The treatments were applied according to design factorial of half fraction with two levels of treatments and three repetitions at the central point. The optimization of parameters for treating dairy industry effluent by electrocoagulation using iron electrodes showed that electric current application for 15 minutes, an initial sample pH close to neutral (pH 7.0) and a current density of 50 A ^{. m?2} resulted in a significant reduction in COD by 58 %; removal of turbidity, suspended solids and volatile suspended solids by 95 %; and a final treated effluent pH of approximately 9.5. Negative consequences of the type of electrode used were the emergence of an undesirable color and an increase in the proportion of dissolved solids in the treated effluent.     

Why seeking feedback from diverse sources may not be sufficient for stimulating creativity: The role of performance dynamism and creative time pressure

We explore how the impact of seeking feedback from different sources (i.e., feedback source variety) on employee creativity is shaped by perceptions of the work environment. Specifically, we argue that two contextual factors, namely, performance dynamism (Study 1) and creative time pressure (Study 2), moderate the relationship between feedback source variety and creativity such that under conditions of high performance dynamism and low creative time pressure, individuals benefit from diverse feedback information. In Study 1 (N = 1,031), the results showed that under conditions of high performance dynamism, the relationship between feedback source variety and self‐reported creativity was nonlinear, with employee creativity exponentially increasing as a function of feedback source variety. Similarly, in Study 2 (N = 181), we found that under conditions of low creative time pressure, the relationship between feedback source variety and employee creativity was nonlinear, with supervisor‐rated creative performance exponentially increasing at higher levels of feedback source variety. Such results highlight that the relationship between feedback source variety and creative performance is affected by the perceptions of the work environment in which feedback is sought.     

The impact of anger on creative process engagement: The role of social contexts

Drawing on the cognitive persistence perspective of creativity and conservation of resources theory, we investigated how 2 social contexts (perceived relationship conflict and coworker support for creativity) influence the relationship between anger and creative process engagement (CPE) in organizations. We tested our hypotheses using 422 daily surveys from 98 participants, collected over 5 consecutive workdays. The results show that anger perceived relationship conflict and coworker support for creativity interact to influence CPE. Specifically, when relationship conflict is high, the anger–CPE relationship is positive for employees who receive high coworker support for creativity, but negative for those who receive low coworker support for creativity. In contrast, when relationship conflict is low, the anger–CPE relationship is positive but does not differ at high versus low coworker support for creativity.     

在教育改革中推进素质教育

大力提高全民族的思想道德和科学文化素质,提高知识创新和技术创新能力,是全面推进我国现代化事业的必然选择,也是中华民族自立于民族之林的根本。     

基于自然语言处理和机器学习的疑似土壤污染企业识别

针对污染场地识别的精准性不高、科学性不足、全面性不够和数据共享难度大等问题,以南方某地级市为研究区,借助大数据平台,基于自然语言处理和机器学习,通过引入摘要中热词权重构建改进型朴素贝叶斯模型,并对兴趣点(POI)数据进行中类行业预测和污染企业识别。结果表明,与随机森林算法和XGBoost算法相比,朴素贝叶斯算法的性能最佳;企业名称+经营范围构建有语义词汇库后,朴素贝叶斯算法的准确率、召回率和综合评价指标(F₁)值得到大幅提升,分别提高了0.23、0.23和0.23;采用权重1.27和平滑参数α为1.10后,建立了改进型朴素贝叶斯模型,实现了行业类别预测,相应的准确率、召回率和F₁值分别为0.63、0.62和0.63;识别出研究区中26个疑似土壤污染行业有关1774家企业。改进型朴素贝叶斯模型能够有效地预测疑似土壤污染企业,具有较好的准确率与召回率,能够为场地污染识别与风险管控实践提供理论依据和设计参数。     

基于DEA非期望产出的中国矿业废水治理效率评价

运用数据包络分析（DEA）非期望产出模型评价了采选冶炼等10个行业2003—2012年的废水治理效率。评价表明：2003—2012年间中国矿业废水治理效率呈现出波动上升的态势且采选行业与冶炼行业的效率从差异较大到基本上趋于一致;黑色金属冶炼及压延加工业、非金属矿采选业、非金属矿制品业、有色金属矿采选业属于效率较高的行业。煤炭开采和洗选业、核实金属矿采选业、其他采矿业属于中等水平。有色金属冶炼及压延加工业、石油和天然气开采业、石油加工、炼焦及核燃料加工业属于效率低下的行业;效率低下首要原因是达标排放量产出不足,其次为污染物过量排放,最后为设施与费用投入冗余。     

公众环境关注、环境规制与中国能源密集型产业动态

自十八大以来,公众环境治理与环境规制成为影响能源密集型产业动态的重要因素。基于2011—2016年百度指数数据与中国海关进出口数据库,将能源密集型产业面临的环境压力划分为公众环境关注、非正式环境规制和正式环境规制,采用Logit模型综合探讨了环境压力对能源密集型产业动态的影响。研究发现:公众环境关注显著降低了能源密集型产业进入的概率,除环境建议与提案外,其他非正式与正式的环境规制均能够抑制能源密集型产业的进入。此外,在公众环境关注度高的区域,非正式和正式的环境规制对能源密集型产业进入的抑制作用更强。     

石化企业地表水环境风险应急设施的环境风险识别

地表水环境风险应急设施是有效消除或降低石化企业的地表水环境风险的基础,在运行中也存在一定的环境风险,也会发生事故并对环境造成严重的负面影响。文章在探讨环境风险类型和风险识别范围的基础上,对石化企业地表水环境风险应急设施的环境风险识别进行了探索性研究。并结合我国西部某大型石化企业的地表水环境应急设施实例,运用故障树分析法进行了环境风险识别的分析,指出了其可能存在的故障。     

待开发区域的主导产业选择思路研究——以营口经济技术开发区为例

从区域经济发展的角度出发,系统研究待开发区域主导产业选择的基本思路.依据主导产业选择原则(发展基础原则、战略分工原则、区域适宜性原则),通过比较研究确定区域发展的产业方向,构建区域主导产业选择的指标体系,采用AHP分析方法对指标进行衡量,最终得出主导产业推荐方案.同时,对营口经济技术开发区进行实证研究,运用上述方法选择适合该区域发展的产业为:港口物流业、冶金钢材业、输变电设备制造业、重型装备制造业、电子信息业和休闲旅游业.本研究为我国待开发区域的主导产业选择提供了一种新思路,其实证分析结果也为营口经济技术开发区的主导产业选择提供了科学依据.     

校办产业效益的评价指标、原则及其优化模式

本文通过分析校办产业效果指标体系的构成,探讨了校办产业效益的均衡协调发展理论,提出了评价校办产业效益的５个有利原则,并在此基础上探索了提高校办产业综合效益的４种系统优化模式