三鑫金铜矿残矿保护性开采方案研究

针对三鑫矿山采用充填采矿法在回采矿房过程中留存大量底柱不能及时回采,后期回采存在安全隐患等问题,对矿山地质条件进行调查,利用Mathew法对矿房稳定性进行研究,结合矿山实际开采计划,对桃花嘴矿区-570～-720四个中段制定了协同回采方案,并利用FLAC3D数值模拟软件对协同回采方案进行可行性探讨.研究表明,为了保持采...     

低温取芯过程热传递方式的数值模拟和实验研究

为了研究热量在低温取芯过程中传递的方式,以型煤为研究对象,使用自制低温取芯模拟装置,通过实验并结合数值模拟,对低温取芯过程热量传递方式进行研究,进而分析煤芯温度的变化规律。研究结果表明:甲烷的存在降低了煤样的热交换速率,使煤芯温度变化滞后于煤样罐壁温度变化;煤体内部温度分布存在差异,煤样中心轴线不同半径处的圆柱面构成变温过程的等温面,在降温过程,热量沿径向由煤样内部向外部传递,升温过程,热量沿径向由外部向内部传递;低温取芯过程热量传递同时存在3种方式:热传导、热对流,煤体表面与罐体内壁表面之间的热辐射,以热传导方式为主。     

多功能再生混凝土球型路障试验研究

针对现行交通路障存在的问题,在前期试验研究的基础上,研究开发了多功能再生混凝土球型路障,不但可有效利用废弃混凝土、节约天然石材资源,还具备防撞击、夜间可视性好等安全功能,具有良好的社会效益、环境效益和经济效益。     

燃煤电厂烟气中铅的测定方法初探

采用过滤法与吸收法联用的采样方法,测定燃煤电厂烟气中Pb,并通过试验考察4种不同的吸收液和4种不同采样流量对测定的影响。结果表明:0.1 mol/L HNO_3、体积分数为5%的HNO_3+10%的H_2O_2和体积分数为1.6%的HNO_3+2.5%的HCl 3种吸收液均对Pb起到良好的捕集作用,且测定结果相近。采样流量控制在20 L/min吸收效果最好。     

长江中游城市群综合发展水平时空分异研究

区域可持续发展理念已被社会各界所接收,并逐步深入到社会发展计划及区域政策制定中。以区域差异分析为基础的区域格局优化是促进区域发展的核心内容。从经济发展、资源利用、环境保护、人口与公共服务和科技创新等5个方面选取23个指标,构建其监测评估指标体系综合分析长江中游城市群综合发展水平时空格局演变,有助于认清长江中游城市群综合发展格局形成的过程,出现的问题及产生的原因,从而制定相应的区域调控政策,这对于促进长江中游城市群内部区域之间协调发展及推进中部崛起战略具有重要的现实意义。基于2005年和2011年长江中游城市群37个地级市的统计数据,借助SPSS、GIS软件,采用全局主成分分析法评价分析其综合发展水平及时空分异,并对其成因进行分析。结果表明：区域综合发展分值有所提升,但增长潜力仍然很大;发展水平差异显著,且两极分化趋势明显;整体呈现出以武汉和长沙为中心,以南昌、合肥为副中心发展格局,但中心城市带动作用较弱,制约各城市群发展的因素各异。因此,未来长江中游城市群应努力提升区域经济发展总量的同时,转变经济产业结构,加强企业创新能力,寻求新的经济增长点。与此同时,应加大基础设施尤其是道路交通的投资强度;充分利用已有的地理区位及资源、科技人才优势发展第二、三产业,提高经济发展中资源的利用效率,降低能耗,保护环境;除此之外,还应加强区域宏观调控,注重城乡统筹发展,协调、平衡区域内部均衡发展,缩小区域之间及内部差异,促进技术转移和优势互补     

剩余污泥好氧堆肥生产有机复混肥的肥分及效益分析

城市污水处理厂剩余污泥含有大量有机质和氮、磷等营养元素,是农业生产宝贵的肥源。将污泥制成有机复混肥可以使作物增产,并改善土壤结构、提高土壤肥力。     

Management commitment to safety as organizational support: relationships with non-safety outcomes in wood manufacturing employees

INTRODUCTION: Employee perceptions of management commitment to safety are known to influence important safety-related outcomes. However, little work has been conducted to explore non-safety-related outcomes resulting from a commitment to safety. METHOD: Employee-level outcomes critical to the effective functioning of an organization, including attitudes such as job satisfaction and commitment to the organization, were included on surveys given to 641 hourly production employees at three wood products manufacturing facilities. Participants' were asked about perceptions of management commitment to safety and job-related variables such as perceived dangerousness of their position, organizational commitment, and withdrawal behaviors. Supervisors also rated the performance of each of their hourly subordinates. RESULTS: Results suggest that employee outcomes differ based on perceptions of management's commitment to safety. Specifically, management commitment to safety was positively related to job satisfaction, organizational commitment, and job-related performance. We also found a negative relationship between commitment to safety and employee withdrawal behaviors. CONCLUSIONS: Our results suggest that increasing employee perceptions of management's personal concern for employee well-being through a dedication to safety will result in positive outcomes beyond improved safety performance. These results also imply that there is a type of social exchange between employees and management that may affect employees similarly to perceived organizational support. IMPACT ON INDUSTRY: Results further reinforce the value of a commitment to safety by a firm's management. Organizations with a strong commitment to safety may enjoy not only a reduction in safety-related events but also increases in desirable employee attitudes and behaviors.     

Oxidation of SO2 in Clouds at Whiteface Mountain

In-cloud oxidation of SO₂ byH₂O₂ was investigated using a tracertechnique based on SO^2– ₄/Se ratios atWhiteface Mountain, New York during summer months from1990 to 1998. Cloud water samples collected at themountain's summit (1.5 km above mean sea level) andaerosols at a below cloud site (Lodge) located at 0.6km amsl and in cloud interstitial air at the summitwere analyzed for SO^2– ₄ and selectedtrace elements. Gaseous SO₂ andH₂O₂were measured in realtime. Cloud water pH wasgenerally below 5.0 with a mean value of 3.6. Theresults show that significant in cloud oxidation occursin clouds during summer months varying from belowdetection to 62% with on average approximately 24% ofthe cloud water SO^2– ₄ produced from in-situ SO₂ oxidation. During summer the clouds wereoxidant limited for approximately one third of thetime.     

机动车源和民用燃料源颗粒物中有机碳和元素碳的排放特征

为了获取机动车源尾气和主要民用燃料源燃烧过程排放的颗粒物中含碳气溶胶的排放特征,使用多功能便携式稀释通道采样器和Model 5L-NDIR型OC/EC分析仪,采集分析了典型机动车源(汽油车、轻柴油车、重柴油车)、民用煤(块煤和型煤)和生物质燃料(麦秆、木板、葡萄树树枝)的PM₁₀和PM_2.5样品中的有机碳(OC)和元素碳(EC).结果表明,不同排放源释放的PM₁₀和PM_2.5中含碳气溶胶的质量分数存在显著差异.总碳(TC)在不同源PM₁₀和PM_2.5中的质量分数范围分别为40.8%～68.5%和30.5%～70.9%,OC/EC范围分别为1.49～31.56和1.90～87.57.不同源产生的含碳气溶胶均以OC为主,OC在PM₁₀和PM_2.5中的质量分数范围分别为56.3%～97.0%和65.0%～98.7%.在PM₁₀和PM_2.5的含碳气溶胶中OC质量分数按照从高到低...     

改性生物炭负载零价铁对土壤中三氯乙烯的去除及微生物响应

三氯乙烯是场地及地下水中广泛存在的典型有机污染物,生物炭基零价铁材料可用于去除地下水中三氯乙烯,然而其也会影响含水层土壤的微生物群落,进而改变三氯乙烯的归趋.通过限氧控温热解,NaOH和HNO₃改性处理,并采用球磨法合成了改性生物炭负载零价铁复合材料,研究了不同改性生物炭负载零价铁对模拟含水层土壤中三氯乙烯的去除及微生物群落的作用机制.结果表明,NaOH改性显著提高了复合材料的比表面积.NaOH改性和Fe/BC为1∶10的复合材料(BC＿2处理组)对三氯乙烯的去除率最高,为90.01%.除BC＿1处理组外,不同处理组均提高了土壤微生物的多样性,改变了微生物群落结构,其中芽孢杆菌属(Bacillus)、硫杆菌属(Thiobacillus)和假单胞菌属(Pseudomonas)可能是三氯乙烯的降解菌属.BC＿2处理组增加了土壤中硫杆菌属和假单胞菌属的相对丰度,有利于三氯乙烯的降解.类诺卡氏菌属(Nocardioideas)、Thermincola、溶杆菌属(Lysobacter)、Gemmatimonas、Microvirga和假单胞菌属维持了微生物群落结构的稳定.微...