大型小区安防系统的几种典型构架

文章结合北京大型小区安防工程建设的实际,介绍了适用于我国大型小区的三种安防系统构架,并展望了大型小区安防技术发展的趋势。     

喷汽式电熨斗火灾痕迹物证鉴定技术的研究

以一起火灾案例为线索，阐述了喷汽式电熨斗的工作原理和结构特点，分析和总结了喷汽式电熨斗残骸所呈现的痕迹特征，并通过金相分析方法和热分析方法对电熨斗的金属底板进行了技术鉴定，确定出各部位的受温程度，以及通过模拟试验的方法进一步验证了该电熨斗火前通电过热引起火灾的结论。     

A colorimetric method for ammonia in natural waters

An improved phenol-hypochlorite method for determining ammonia in water using nitroprusside as catalyst has been investigated. Unlike other recently published methods, the method is simple (and sufficiently sensitive for low-level analyses) and does not require accurate time intervals between reagents, not expensive equipment. The method is well suited for routine use.

Beer's Law was obeyed over the whole ammonia range investigated. Reproducibility was 1·3 per cent with 10 μg N, and 5·7 per cent with 1 μg N.     

国有控股企业实施“股权激励”问题浅析

通过对国内公司实行股权激励的现状和基本形式的分析,得到如下结论:目前的股权激励还存在很多弊端,需要进一步加以完善。必须突出国有资产出资人的责任,并对其加强监管,建立健全信息披露机制。     

某现浇混凝土异形箱梁加固工程研究分析

结合工程实例，通过对现浇异形箱梁的病害状况的分析，提出三种病害处理方案，通过三种方案的对比分析、计算，得出合理、优化的现浇混凝土异形板加固处理方案，为其他类似工程项目提供了参考。     

盘石岭隧道开挖和支护的施工要点

盘石岭隧道为典型的浅埋软弱围岩隧道，岩层节理发育且距进口处有后断层带，于洞身成斜交，施工中，首先采用抗滑桩施工稳定山体，洞身采用中隔法和喷锚混凝土，钢架支撑、注浆锚杆等初期支护，有效地防止了山体滑移，成功地通过了破碎带。介绍了其施工工艺及施工方案，并针对以上一些问题作了分析。     

框架结构施工中的质量隐患分析与预防措施

就框架结构施工中容易忽视的结构安全隐患和质量隐患进行了原因分析，并提出了相应的预控措施，指出只要掌握隐患产生的原因，进行理论概念分析，提前预控分析，就会尽快消灭隐患。     

深圳沿海高速公路隧道施工监控量测及其对策

通过对实测数据的现场分析、处理,及时向施工方、监理方、设计方和业主提供分析资料,直接服务该工程公路隧道施工,尤其对保证高速公路隧道施工安全和结构稳定具有重要的现实意义。     

Technique for measuring metallic salt effects upon the indigenous heterotrophic microflora of a natural water

The effects of several concentrations of the metallic salts Ag₂SO₄, NaAsO₃, BaCl₂2H₂O, CdCl₂2.5 H₂O, CrCl₂6H₂O, CuCl₂, HgCl₂, NaCl, NiCl₂6H₂O, PbCl₂ and ZnCl₂ upon the indigenous heterotrophic microflora of a natural water were studied. Effects of these salts upon the heterotrophic activity of the microbes were assayed using the heterotrophic technique whereas lethal effects upon the heterotrophic bacteria were determined using nutrient agar plate counts. The heterotrophic activity method is based upon the uptake and mineralization of a radioactively labeled metabolite (in these experiments ¹⁴C-glucose) by the indigenous aquatic microbes and data analysis is by Michaelis—Menten enzyme kinetics equations. Concentrations of metallic salts which resulted in bacterial death also caused erratic uptake and mineralization rates of ¹⁴C-glucose whereas sub-lethal concentrations, as determined by nutrient agar plate counts, caused a non-competitive inhibition of maximum heterotrophic activity and markedly increased the turnover time of the glucose substrate.     

烟气向远距离处迁移的研究

火灾产生的烟气是造成人员伤亡的主要原因 ,在很多的火灾案例中 ,远离火源处因烟气毒性而致死的情况非常普遍。关于烟气中肪物 ,尤其是 CO是如何向远距离处的迁移问题 ,着重介绍了目前国内外在火灾烟气毒性研究领域关于烟气向远距离处迁移规律研究的一些进展 ,结合目前的实际研究 ,对未来的研究作了展望