发展消防中介组织推动公共消防安全

分析了我国消防中介组织的现状,论述了发展消防中介组织对推动社会公共消防安全的重要作用,提出了培育和加强消防中介组织的思考和建议。     

我国的建筑能耗现状及解决对策

建筑能耗将是我国未来能源消耗的主要增长点,建筑节能技术的研究与应用将对我国能源消费产生深远的影响.介绍了我国建筑能耗的基本现状,提出了建筑节能的基本原则和基本技术措施,并针对家用空调的特点,提出了对家用空调冷凝热进行回收利用的观点,并利用热回收系统加热生活用水.详细阐述了家用空调冷凝热回收的节能技术以及对我国的建筑节能工作产生的积极影响.     

Adaptive tetrahedral mesh generation by constrained Delaunay refinement

This paper presents a tetrahedral mesh generation method for numerically solving partial differential equations using finite element or finite volume methods in three‐dimensional space. The main issues are the mesh quality and mesh size, which directly affect the accuracy of the numerical solution and the computational cost. Two basic problems need to be resolved, namely boundary conformity and field points distribution. The proposed method utilizes a special three‐dimensional triangulation, so‐called constrained Delaunay tetrahedralization to conform the domain boundary and create field points simultaneously. Good quality tetrahedra and graded mesh size can be theoretically guaranteed for a large class of mesh domains. In addition, an isotropic size field associated with the numerical solution can be supplied; the field points will then be distributed according to it. Good mesh size conformity can be achieved for smooth sizing informations. The proposed method has been implemented. Various examples are provided to illustrate its theoretical aspects as well as practical performance. Copyright © 2008 John Wiley & Sons, Ltd.     

改性海泡石与金属氧化物对膨胀阻燃PP燃烧性能的影响

采用极限氧指数、垂直燃烧、TGA、FTIR和SEM等方法研究了改性海泡石(SP)及金属氧化物(ZnO、Ni2O3)对聚丙烯(PP)/马来酸酐接枝三元乙丙橡胶(EPDM-g-MAH)/膨胀阻燃剂(IFR)体系燃烧性能的影响。极限氧指数和垂直燃烧结果表明:SP及金属氧化物均对IFR有一定的协效作用,能提高体系的极限氧指数和阻燃性能。TGA结果表明:SP可以提高燃烧残余炭层的稳定性和残炭率。SEM观察表明:SP与ZnO复配体系的燃烧残余炭层更致密和连续。FTIR测试发现SP、金属氧化物促进了IFR在PP体系中的交联成炭作用,较快生成连续的保护性炭层。     

3-丁烯腈在盐酸催化剂溶液中的水解动力学研究

以盐酸为催化剂,通过水解3-丁烯腈合成3-丁烯酸,考察了3-丁烯腈初始浓度、反应温度、盐酸浓度对水解反应过程的影响;在此基础上,研究了3-丁烯腈水解动力学,拟合出了反应速率常数和反应活化能。结果表明,该反应为1级串连反应,同时盐酸浓度对水解反应速率常数有很大的影响:当盐酸的浓度低于5.0 mol/L时速率常数的关系为k1k2;且随着盐酸浓度的增大,腈水解反应活化能逐渐减小。     

改性骨炭去除饮用水中氟离子的研究

文章旨在研究改性骨炭对饮用水中氟离子的去除效果。用AlCl3对常见的骨炭进行改性,并考察了pH、氟溶液初始浓度、温度及吸附剂用量对氟离子吸附去除的影响。结果表明:经AlCl3溶液改性的骨炭,用量为0.2 g/L时,其在24 h内对10 mg/L氟离子的去除率达97%以上。该吸附剂比未改性效果好,具有一定的应用前景。     

锁斗系统常见故障及处理

锁斗是气化系统的一个重要设备,及时将气化渣排出,保证气化炉排渣通畅。煤种变化或操作不当,致使锁斗故障经常发生,尤其是锁斗堵渣和仪表阀内漏,严重危及气化炉的稳定运行,文章主要介绍锁斗系统常见问题及处理方法。     

芳纶以及连续玄武岩纤维和玻璃纤维的耐酸性研究

测试和分析了芳纶、连续玄武岩纤维和玻璃纤维分别在65、80和95℃下浓度为2 mol/L的盐酸溶液中经不同时间的腐蚀后其力学性能以及质量的变化情况。结果表明,芳纶(芳酰胺纤维)的耐酸性能最优,其断裂强力和断裂伸长率的保持率最大;连续玄武岩纤维其次,玻璃纤维最差。因此芳纶比连续玄武岩纤维和玻璃纤维更适合用于酸性环境中,连续玄武岩纤维和玻璃纤维应尽量避免酸液对其的作用。     

水润滑推力轴承推力瓦应力场分析

水润滑推力轴承工作时,推力瓦和推力环端面间的高速相对运动会产生大量摩擦热,导致端面温升和热变形,使推力瓦产生局部高温和高应力,影响水对推力轴承的润滑效果、传递轴向推力效果、轴承寿命和安全性。基于ANSYS软件平台,建立水润滑推力轴承斜面平台固定推力瓦危险截面有限元分析模型,分析推力瓦危险界面的变形和应力场。结果表明:推力瓦的最大变形和最大Von Misses应力均出现在离推力瓦进水方向2/3瓦长处。     

A Computational Study on Thiourea Analogs as Potent MK-2 Inhibitors

Mitogen-activated protein kinase-activated protein kinase 2 (MK-2) has been identified as a drug target for the treatment of inflammatory diseases. Currently, a series of thiourea analogs as potent MK-2 inhibitors were studied using comprehensive computational methods by 3D-QSAR, molecular docking and molecular dynamics simulations for a further improvement in activities. The optimal 3D models exhibit high statistical significance of the results, especially for the CoMFA results with r(2) (ncv), q(2) values of 0.974, 0.536 for the internal validation, and r(2) (pred), r(2) (m) values of 0.910, 0.723 for the external validation and Roy's index, respectively. In addition, more rigorous validation criteria suggested by Tropsha were also employed to check the built models. Graphic representation of the results, as contoured 3D coefficient plots, also provides a clue to the reasonable modification of molecules: (i) The substituent with a bulky size and electron-rich group at the C5 position of the pyrazine ring is required to enhance the potency; (ii) The H-bond acceptor group in the C3 position of the pyrazine ring is likely to be helpful to increase MK-2 inhibition; (iii) The small and electropositive substituent as a hydrogen bond donor of the C2 position in the oxazolone ring is favored; In addition, several important amino acid residues were also identified as playing an important role in MK-2 inhibition. The agreement between 3D-QSAR, molecular docking and molecular dynamics simulations also proves the rationality of the developed models. These results, we hope, may be helpful in designing novel and potential MK-2 inhibitors.