喷淋与机械排烟作用下小室火灾特性的实验研究

采用全尺寸实验对水喷淋和机械排烟作用下的小室火灾特性展开了研究,揭示了小室内烟气温度、CO浓度的变化规律.结果表明,对于一定规模的火灾,存在水喷淋压力和风机风量的临界组合,来对水喷淋和机械排烟共同作用时的控火和灭火两种效果进行转换.水喷淋的作用可以有效降低小室内烟气温度,抑制轰燃发生,但是也会产生大量的烟水混合气.灭火时,小室内的烟气温度是持续下降;而控火时,小室内的烟气温度会平稳一段时间,再慢慢下降.CO浓度在水喷淋作用后会急剧增加,控火时存在两个峰值,灭火时只有一个峰值.水喷淋的压力是其中关键的参数,而风机风量只是一个次要的参数,两种系统的作用效果相反.控火时,CO生成量随着水喷淋压力的增加而增加,随着风机风量的增加而降低.这些都为大空间内小室水喷淋系统和机械排烟系统的设计提供了基础的实验依据.     

烟草行业的火灾特点及其监测方法的讨论

烟厂是火灾危险性较大的部门，加强其火灾的早期探测报警是防止火灾发生、减少火灾损失的重要方面。本文对烟厂中各主要生产环节的火灾特点作了分析，指出应针对各部分的特殊性采取适当的火灾探测方法并对现在常用的一些火灾探测技术在烟厂中的适用性作了讨论，认为现有的光束式火灾探测器较适用于内部空间较大的烟厂仓库和厂房。对安装了电视监控系统的企业，建议将其与计算机图象分析技术相结合，增加其防火监视功能。     

空心玻璃微珠对泡沫灭火剂发泡能力和热稳定性影响研究

本文研究了空心玻璃微珠添加量及泡沫液浓度对泡沫灭火剂发泡能力和稳定性的影响,对比了热辐射条件下空心玻璃微珠添加前后泡沫的热稳定性.结果表明,添加量低于40%时,空心玻璃微珠对泡沫灭火剂发泡能力影响不大,而泡沫的稳定性显著降低,添加量为50%时,虽泡沫发泡能力降低,但泡沫的稳定性却增强.泡沫的发泡能力随蛋白泡沫浓度升高而增强.蛋白浓度为10%,空心微珠添加量为50%时,由于泡沫内部形成了稳定的三相泡沫骨架结构,泡沫热稳定性较未添加微珠之前显著增强.     

阿什河底栖动物群落特征及影响因子

阿什河作为松花江的一级支流,全境包含了从Ⅰ类到劣Ⅴ类的各种类型水质。通过对阿什河沿线底栖动物群落构成进行调查,结合典范对应性分析(CCA)对底栖动物群落与环境因子进行相关性分析得出结论,溶解氧和高锰酸盐指数为研究区域内底栖动物群落构成的主要限制因子。为分析不同水质条件下底栖动物种群变化成因和从生物学角度提出阿什河治理方法提供技术依据。     

泉州市表层土中多环芳烃的含量、来源及其生态风险评价

采集了泉州市不同功能区的33个表层土壤（0～10 cm）样品,利用超高效液相色谱系统（UPLC）-荧光检测器法,研究了土壤中15种优控多环芳烃的含量和分布特征,并利用比值法、因子分析和多元线性回归法对其来源进行了分析,以及采用苯并（a）芘的毒性当量浓度（TEQBaP）评价了土壤中PAHs的生态风险.结果表明,土壤中15...     

Determining the COVID-19 effects on spillover between oil market and stock exchange: a global perspective analysis

Environmental Science and Pollution Research - This paper investigates volatility spillovers between the global crude oil market and the stock markets of the global oil stock markets (Russian,...     

Analysis of the mechanism of the impact of internet development on green economic growth: evidence from 269 prefecture cities in China

As the digital economy develops rapidly and the network information technology advances, new development models represented by the network economy have emerged, which have a crucial impact on green economic growth. However, the relevant previous studies lacked the role of analyzing the direct and indirect effects of internet development on green economic growth at the prefecture-level city level. For this purpose, this paper aims to examine the intrinsic mechanism of the impact of internet development on green economic growth and provide empirical support for cities and regions in China to increase internet construction. Furthermore, the mixed model (EBM), which includes both radial and non-radial distance functions, is applied to calculate the green economic growth index. Fixed effect model and mediation effect model are also employed to test influence mechanisms of the internet development on green economic growth using panel data of 269 prefecture-level cities in China from 2004 to 2019. The statistical results reveal that internet development has contributed significantly to green economic growth. When the internet development level increases by 1 unit, the green economic growth level increases by an average of 5.0372 units. However, regional heterogeneity is evident between internet development and green economic growth, that is, the promoting effect of internet development on green economic growth is gradually enhanced from the eastern region to the western region. We also find that internet development guides industrial structure upgrading improves environmental quality and accelerates enterprise innovation, which indirectly contributes to green economic growth. And internet development mainly achieves green economic growth through enterprise innovation. Based on the above findings, we concluded that policymakers should not only strengthen the guiding role of social actors to promote the stable development of the internet industry, but also foster the construction of the three models of “internet+industry integration,” “internet+environmental governance,” and “internet+enterprise innovation” to promote green economic growth.

     

江苏油田原水油珠粒径分布测定

测定了江苏油田黄珏污水站原水中油珠粒径分布,为合理选择和设计污水处理工艺与装置提供了必要的基础数据。实验测定江苏油田黄珏污水站原水含油量为62.3 mg/L。该站的三相分离器具有较好的油水分离能力。原水中浮油(粒径≥99.4μm)占8.3%,粒径≥28.4μm的分散油占14.3%,而粒径≤28.4μm的分散油、浮化油等约占77.4%。单纯采用重力沉降法可除去原水中22.6%的含油量。同时对油珠粒径分布测定方法进行了改进。新方法减少了水样含油量的测定工作量,且设备简单、操作方便。     

对氨基苯胂酸的生命周期评价

本文介绍了最常用的有机胂制剂——对氨基苯胂酸的主要用途和污染特征,从生命周期的角度识别并定量评价了其生产、使用和残留过程的环境影响,评价结果表明对氨基苯胂酸在土壤中最终残留的环境骰响占其整个生命周期的99％以上,指出了常规环境影响评价在评价其环境污染上的局限性,据此提出逐步减少或禁止有机胂制剂的生产和使用、并在一些特殊的建设项目环境影响评价中推广生命周期评价的建议。     

蜂窝流道热沉强化传热数值模拟

热沉是模拟太空深冷环境的核心部件。为提高空间深冷环境的模拟效果,更好地满足型号试验需求,设计了一种蜂窝流道热沉。利用流体力学理论和有限元方法对蜂窝热沉内部流体的流动和强化传热进行数值模拟,分析流道结构参数对流体流动和换热的影响,确定最优的流道结构参数。结果表明,同等条件下蜂窝热沉表面温度低于管板式热沉5 K左右,温度均匀性可达到±2 K;流道深度和间距是影响流体在热沉中流动与传热的重要因素,合理选择流道结构参数可以提高热沉的换热性能;需要综合考虑传热和阻力问题来确定最优的流道结构参数,最优的蜂窝热沉流道间距为75 mm,深度为10 mm。