Extending social responsibility to small and medium-sized suppliers in supply chains: A fuzzy-set qualitative comparative analysis

Buying firms’ sales and reputation will be greatly damaged by any non-responsible behaviors on the part of suppliers, especially when those suppliers, like small and medium-sized enterprises (SMEs), have restricted resources and capabilities. To eradicate these risks, a growing number of buying firms have introduced socially responsible supplier development (SRSD). SRSD, including monitoring and evaluating suppliers, can provide them with incentives and assistance. Based on configuration theory and contingency theory, fuzzy-set qualitative comparative analysis (fsQCA) is adopted in this study to examine how SRSD practices adopted by buying firms, supply chain partnership, and market turbulence affect the corporate social responsibility (CSR) performance of their SME suppliers. We find that, as core factors, supplier monitoring, supplier assistance, and supply chain partnership can work together with peripheral conditions to achieve superior CSR performance. In addition, even at different levels of market turbulence, superior CSR performance can be realized through different causal configurations.     

鞍钢用进口煤试验研究

鞍钢目前使用的炼焦煤中缺少强粘结性煤,为了解决这一问题,从2004年开始,鞍钢先后从澳大利亚和加拿大进口了部分优质煤.通过对单种煤进行质量检验分析,并对单种煤和配合煤进行实验室及工业试验研究,得出了进口煤的适宜使用量及品种.     

Analysis of a solarimetric database for Mexico and comparison with the CSR model

An analysis of the solar radiation database from the network of meteorological stations of the Mexican National Weather Service was carried out. The database includes global irradiance measurements from the oldest 136 stations distributed in the Mexican territory. The consistency of data acquisition from the launch of the stations until 2010 was checked, and visual inspection of graphs of daily irradiance data was carried out, for the first three years operation, to ensure quality and reliability of the data. The results indicate that less than half of the stations have an adequate regularity for data records. With a limited number of selected stations that passed the applied quality criteria, evaluation of hourly and daily global irradiations was carried out. These results were compared to satellite derived data for Mexico, based on NREL's CSR model. The results of the comparison show a good agreement between measured and modeled daily global solar irradiation with an average RMSE of 6.6%. Based on the selected stations, a daily irradiation mean of 5.5 kWh/m²/day is estimated for the country.     

生态文明视野下的矿山企业社会责任探讨

生态文明建设为矿山企业承担社会责任赋予了新的意义。本文通过分析矿山企业的特殊性,提出矿山企业的社会责任应包括协调人与人、人与自然、人与社会三方面的关系。笔者认为,促进矿山企业承担社会责任的主要途径包括矿山企业进行国家级绿色矿山建设、提高道德资本水平、发布企业社会责任报告,以及国家健全相关的法律法规和完善生态价值评估体系。     

配加低阶烟煤在不同堆密度下炼焦焦炭热性能研究*

选取了鞍钢化工总厂常用的4种炼焦煤和神木长焰煤为实验煤种,采用2kg室式实验焦炉分别对单种煤和配合煤在三种堆密度下炼焦,所得焦炭按GB1997-89测定其反应性(CRI)和反应后强度(CSR).旨在寻求不同堆密度炼焦对焦炭热性能和长焰煤对捣固炼焦焦炭热性能的影响规律.结果表明:单种煤、配合煤炼焦的焦炭CRI都随着炼焦煤堆密度的增加而降低,CSR则提高;添加长焰煤炼焦对焦炭的CRI、CSR的总趋势是长焰煤配比越高则焦炭CRI越高,而CSR越低;但通过提高堆密度的方式炼焦,可以减小低阶煤对焦炭CRI和CSR的劣化.     

基于电感电压反馈和输入整形技术的LC滤波器混合阻尼控制

电流型PWM整流器采用LC环节来滤除谐波及帮助器件换流,LC型滤波器呈二阶特性,存在谐振尖峰,且电容阻尼较小,在控制系统存在扰动的情况下,容易引起电流波形畸变和振荡。提出了一种采用输入整形技术和电感电压反馈结合的控制策略,输入整形技术能够有效地抑制小阻尼系统的振荡,电感电压反馈控制能够在外部干扰抑制网侧电流波形畸变。结合两者的优点,可有效地解决电流型脉宽调制整流器网侧电流振荡和畸变。仿真验证了所提出的控制策略能够有效减少电流畸变,增加系统的稳定性,并具有一定工程实用性。     

电流型整流器双闭环控制系统设计和仿真

针对三相电流型PWM整流器交流侧引入了LC滤波器而带来的超前功率因数问题,采用三值逻辑PWM信号发生技术进行脉宽调制,控制系统采用双闭环控制方式,在Matlab/Simulink环境下建立了该整流器的仿真模型。仿真结果表明,该调制方法和控制方式能实现电流型整流器的交流侧单位功率因数运行,并获得稳定的输出直流。     

添加剂对焦炭热性质影响的研究

焦炭热强度是反映焦炭在高炉中性能的重要指标,可以通过向焦炭中添加某些物质,达到改善焦炭热强度的目的。在所有起作用的添加剂中,其成本与改质效果差异很大,本研究通过两种添加剂的不同配比试验,可以找到能发挥最大经济效益的配合比例。此外,对添加剂改变焦炭微观结构的情况进行了研究,对比了改质前后、反应前后焦炭微观结构的变化,探讨了添加剂改变焦炭热性质的机理。     

焦炭钝化技术的研究

以硼酸作钝化剂,通过系列试验考察了钝化剂浓度、焦炭质量和钝化方式对焦炭钝化效果的影响,并探讨了硼酸改善焦炭热性能的机理.试验结果表明,硼酸作为钝化剂可显著改善焦炭的热性能,硼酸溶液浓度越大,其钝化效果越显著,硼酸对中等强度焦炭的钝化效果最为明显,钝化方式对钝化效果无明显影响.     

高炉用焦炭热强度指标要求及检测方法

高炉冶炼通常要求焦炭具有较低的反应性和较高的反应后强度．但焦炭反应性过低不利于提高高炉反应效率．本文对焦炭在高炉内消耗机理进行了分析,认为高炉炉身焦炭消耗量与铁矿石直接还原度相关,炉身消耗的焦炭量是比较稳定的,现有焦炭热强度评价方法存在不足．为了避免焦炭反应过度,应调整焦炭热强度指标的测定方法,如改变反应气氛或根据焦炭失重量确定反应时间,使测定结果能够合理反映炉内焦炭消耗的规律．