大型商业建筑室内步行街商铺火灾荷载调查研究

以我国不同城市的5家大型商业建筑为调查对象,通过现场调查及数据统计分析等方法,对其室内步行街两侧329家商铺的火灾荷载进行调查研究。对不同经营业态商铺数量在所调查商铺总数中所占比例及其地面面积进行了统计,并且获得了商铺内部可燃物种类、数量、质量、分布等情况。按照不同的经营业态,对所调查店铺的火灾荷载密度进行了统计和计算,得出了3种不同分位值的火灾荷载密度,并比较分析了不同经营业态店铺的火灾荷载密度,为大型商业建筑火灾危险性分析及火灾场景设定提供了基础数据。     

农民工职业危害防护需求意愿调查分析

为了调查农民工职业危害防护的具体需求意愿及他们对企业职业危害管理现状的认知,分析农民工职业危害防护需求意愿与农民工职业危害防护行为之间的关系。采用问卷调查的定量调查方法进行调查。调查对象中男性农民工409人,女性农民工157人。参与问卷调查的农民工,均接触一种及以上的职业性有害因素。调查内容包括了解公司预防和控制职业病的政策,参与公司的职业危害管理决策,实施的职业性健康安全培训、健康监护、个人防护用品的使用等预防和控制职业病的管理措施等方面,本次调查显示,农民工对于预防职业危害表现出强烈的需求愿望,且对企业的职业危害防护现况表示了不满,倾向于采取极端的行为维护自身的健康权益。但另一方面,农民工实际参与企业职业危害防护的行为率较低,与他们的需求意愿相比有明显的差距。     

企业安全管理中的非正式群体功能探析

在企业中非正式群体是客观存在的,它对企业安全管理具有正向（积极）和负向（消极）的双重功能。如果正确引导,非正式群体可弥补正式群体的不足,在实现企业安全生产目标中发挥重要的作用,反之,则会干扰企业安全生产目标的实现。企业安全管理者应正视非正式群体的存在,并正确认识非正式群体,充分利用其特点,加强引导与控制,因势利导,趋利避害,调动一切积极因素,为实现企业安全目标服务。本文介绍了企业非正式群体的类型及特点,阐述了在企业安全管理中如何加强对非正式群体的引导、利用及控制管理,充分发挥非正式群体的正向功能,限制其负向功能。     

峨眉拟单性木兰种子特性及离体培养初报

对峨眉拟单性木兰的果实、种子性状及种子内部结构进行了初步研究,并对其种子进行了离体培养.结果表明,峨眉拟单性木兰果实近卵圆形,红褐色;种子约扁,卵圆形似豆子,具假种皮,橘红色,含油脂;种皮黑褐色,坚硬光滑,具深浅不同的纹理;种子内含胚乳,种子萌发缓慢且萌发率低.     

基于网络团购的民族地区旅行社电子商务发展研究

网络团购已经逐渐发展成为一种新兴的电子商务模式,团购产品的覆盖范围也已非常广泛.揭示了民族地区旅行社电子商务发展与网络团购的内在相关性和作用机理,并探讨了适合民族地区旅行社电子商务发展的网络团购模式,提出了发展民族地区旅行社电子商务的思路与对策.     

UV光解技术在采油（气）田脱水废气处理中的应用

采用UV高效光解净化设备,对采油（气）田TEG脱水工艺产生的废气深度净化、脱臭,其净化效率达99%;同时克服了废气成分复杂、浓度高、含水率高、环境温差大、防爆要求高等废气净化方法的限制性难题,并能广泛适用于多种行业的废气净化。     

Effect of arsenic species on the growth and arsenic accumulation in <Emphasis Type="Italic">Cucumis sativus</Emphasis>

The effects of arsenic (As) species, such as As(III), As(V) and dimethylarsinic acid (DMA), on the accumulation of As in cucumber (Cucumis sativus), as well as on its growth in a soil mesocosm were evaluated. When Cucumis sativus was cultivated in soils contaminated with 20 and 50 mg/kg of As(III), As(V) or DMA for 40 days, the growth was markedly inhibited by the inorganic As (As(III) and As(V)) rather than the organic As (DMA). Irrespective of the As species, the As concentrations accumulated in Cucumis sativus increased with increasing As concentration in the soil. The As bioaccumulation factors from soil into the tissue of Cucumis sativus were 17.5–35.4, 29.3–42.7 and 17.6–25.7 for As(III), As(V) and DMA, respectively. In addition, the As translocation factors from the roots to shoots were 0.025–0.031, 0.018–0.032 and 0.014–0.026 for As(III), As(V) and DMA, respectively. In conclusion, Cucumis sativus mainly accumulated As in its roots rather than its shoots and easily accumulated inorganic rather than organic As from the soil into its tissue.     

乙二胺四乙酸(EDTA)和乙二胺二琥珀酸(EDDS)对污染土壤中Cd、Pb的浸提效果及其风险评估

为了研究EDTA和EDDS对污染土壤中Cd、Pb的去除效果和去除后土壤中Cd、Pb的风险,利用不同浓度的EDTA和EDDS(0、5、10、20、30、50 mmol·L-1)对污染土壤中Cd、Pb进行浸提,并利用 in vitro方法(人工模拟胃肠系统)对浸提后的土壤进行风险评估.结果表明,EDTA对Cd的去除率显著高...     

二噁英对免疫系统影响的研究进展

二噁英是持久性有机污染物的一种,它对人体健康的影响是多方面的,包括引起氯痤疮、诱发肿瘤、导致畸形、内分泌干扰、免疫毒性和肝毒性等等.本文着重总结了在二噁英对免疫系统的影响方面最近的研究进展.研究表明,二噁英可以从多方面干扰免疫系统的功能,它可以影响机体的体液和细胞免疫、超敏反应、自身免疫以及影响免疫细胞本身的活性,同时...     

Effect of arsenic species on the growth and arsenic accumulation in Cucumis sativus

The effects of arsenic (As) species, such as As(III), As(V) and dimethylarsinic acid (DMA), on the accumulation of As in cucumber (Cucumis sativus), as well as on its growth in a soil mesocosm were evaluated. When Cucumis sativus was cultivated in soils contaminated with 20 and 50 mg/kg of As(III), As(V) or DMA for 40 days, the growth was markedly inhibited by the inorganic As (As(III) and As(V)) rather than the organic As (DMA). Irrespective of the As species, the As concentrations accumulated in Cucumis sativus increased with increasing As concentration in the soil. The As bioaccumulation factors from soil into the tissue of Cucumis sativus were 17.5-35.4, 29.3-42.7 and 17.6-25.7 for As(III), As(V) and DMA, respectively. In addition, the As translocation factors from the roots to shoots were 0.025-0.031, 0.018-0.032 and 0.014-0.026 for As(III), As(V) and DMA, respectively. In conclusion, Cucumis sativus mainly accumulated As in its roots rather than its shoots and easily accumulated inorganic rather than organic As from the soil into its tissue.