建筑消防工程实行监理制度之我见

建筑消防工程关系到建筑安全的重要方面 ,随着建筑规模的扩大 ,建筑消防工程的迅猛发展 ,消防系统数量的增加和系统本身的日益复杂 ,实行消防工程监理制度呼声日高 ,笔者就消防工程监理 ,结合工作实践 ,谈谈自己的一些看法 ,并就相关问题试作探讨 ,望能引起有关方面重视 ,加快实行监理的进程。1　实行监理的必要性1.1　消防工程动态监督的需要。消防工程由设计人员根据国家有关规范设计 ,交施工单位施工 ,由消防部门进行验收。由于设计、施工工作的失误 ,致使一些问题无法及时发现 ,形成先天性隐患 ,无法整改 ,近几年来的多起特大火灾暴露了…     

Effect of current density and oil concentration on hydrodynamic aspects in electroflotation column during oil/water emulsion treatment

The objective of this work is to study the efficiency of electroflotation process by treatment of effluent from vegetable oil refining industry in the form of oil–water emulsion. We will interest in hydrodynamic aspects in electroflotation columns. We will study the effect of current density and oil concentration on bubbles diameter, bubbles rise velocity, Reynolds number and the effect of the latter on the efficiency of the oil recovery. To evaluate bubble’s characteristics we used the method of video recording followed by an image processing, view of its simplicity this method is used widely. The different bubbles flow regimes were predicted by the calculation of Reynolds number. The efficiency of the process was estimated from turbidity.     

Promoting CM Student Success: Establishing an Academic Performance Benchmark Given Construction-Education Self-Efficacy,Motivation and Planned Behavior

High levels of self-efficacy, motivation and intentions to perform well are necessary to achieve high grade point averages (GPA) in demanding academic programs including engineering, mathematics and the sciences. However, scant research has investigated these constructs within the domain of construction management (CM) education. The Construction Training Attitudes and Intentions Scale (CTAIS), which adapts self-efficacy, motivation and planned behavior constructs to the construction-education domain, was administered among CM and Non-CM students (n = 633) enrolled in courses required for a bachelor degree at three American Council for Construction Education accredited programs. Significant differences (p < .001) in construction-education domain-level constructs were observed for CM and Non-CM majors providing evidence of face validity. CM majors (n = 587) were separated for ANOVA. Significant differences in self-efficacy (p = .014) and planned behavior (p = .001) were observed by GPA. Post-hoc analysis revealed differences in these constructs based on GPA above, or below, 3.0. CM majors (n = 587) were aggregated using the 3.0 GPA benchmark (GPA > 3.0, n = 328; GPA< 3.0, n = 239). T-test results revealed significantly higher levels of self-efficacy (p = .001) and planned behavior (p < .001) among students with GPAs above 3.0. This study provides CM educators with a domain-specific measure to target students for interventions that promote success. Limitations and opportunities for further research are discussed.     

玻璃钢覆面木胶合板模板

本文探讨了以酚醛树脂胶马尾松胶合板为基材，表面用玻璃钢覆面改善面板理化性能和提高板材力学性能的生产方法，并检测了板材的静曲强度，弹性模量，表面耐磨性和耐水性能，结果表明，玻璃钢覆面后的马尾松胶合板模板的表面理化性能和力学性能得到了显著的提高。有利于作为混凝土模板使用。     

SP预应力空心板在居住建筑中的应用和发展

分析现浇板和传统预制板的特点和弱点，提出发展SP板和SP叠合板是住宅实现大开间、灵活隔断的有效途径之一，也是建筑施工实现现代化的重要内容之一。     

基于PPP项目的风险管理研究

本文对PPP模式相关内容进行了梳理,在此基础上,系统的探讨了基于 PPP 项目的风险问题。针对项目不同特征的基础上,对 PPP 项目风险识别的相关主要风险集合,对 PPP 项目的风险因素进行实质性分类划分,以便项目参与方对项目风险进行有效控制。     

Which persistent organic pollutants can we map in soil using a large spacing systematic soil monitoring design? A case study in Northern France

Persistent organic pollutants (POPs) impact upon human and animal health and the wider environment. It is important to determine where POPs are found and the spatial pattern of POP variation. The concentrations of 90 molecules which are members of four families of POPs and two families of herbicides were measured within a region of Northern France as part of the French National Soil Monitoring Network (RMQS: Réseau de Mesures de la Qualité des Sols). We also gather information on five covariates (elevation, soil organic carbon content, road density, land cover and population density) which might influence POP concentrations. The study region contains 105 RMQS observation sites arranged on a regular square grid with spacing of 16 km. The observations include hot-spots at sites of POP application, smaller concentrations where POPs have been dispersed and observations less than the limit of quantification (LOQ) where the soil has not been impacted by POPs. Fifty nine of the molecules were detected at less than 50 sites and hence the data were unsuitable for spatial analyses. We represent the variation of the remaining 31 molecules by various linear mixed models which can include fixed effects (i.e. linear relationships between the molecule concentrations and covariates) and spatially correlated random effects. The best model for each molecule is selected by the Akaike Information Criterion. For nine of the molecules, spatial correlation is evident and hence they can potentially be mapped. For four of these molecules, the spatial correlation cannot be wholly explained by fixed effects. It appears that these molecules have been transported away from their application sites and are now dispersed across the study region with the largest concentrations found in a heavily populated depression. More complicated statistical models and sampling designs are required to explain the distribution of the less dispersed molecules.     

外包混凝土组合钢柱的偏心受压分析

给出了偏心受压下外包混凝土组合钢柱的3维非线性模型。该组合柱两端铰接,沿主要轴线方向施加一个偏心力。此偏心率的范围在柱截面总高度的0.125～0.375之间。该模型考虑钢、混凝土、纵向和横向钢筋的非弹性性能,以及组合柱中混凝土的约束作用。考虑了钢与混凝土之间、纵向与横向钢筋之间、钢筋与混凝土之间交界面粘结力,以及不同材料对组合柱抵抗变形所起的作用。该模型考虑了初始几何缺陷。已有的试验数据证明了模型的有效性。混凝土强度等级为30～110MPa。钢截面的屈服应力为275～690MPa。通过改变偏心率、柱的尺寸、结构钢尺寸与屈服应力值和混凝土强度,以确定其对偏心受压下组合柱性能的影响。结果显示,结构钢屈服应力的增加对组合柱强度的影响较大,尤其当柱的偏心率为0.125D时。当柱的偏心率为0.375D且混凝强度低于70MPa时,结构钢屈服强度的变化对柱强度影响较大。将数值分析所得组合柱的强度与设计规范Eurocode4的计算结果进行比较。结果表明,Eurocode4准确地计算出偏心组合柱强度,但是估算的弯矩过大。     

防盗瓶盖用8A06-H16铝合金带材工艺研究

研究了不同的退火温度和冷变形量对8A06铝合金组织、性能特别是对深冲性的影响，确定了8A06铝合金H16状态带材的生产工艺参数。在工业生产条件下，其产品的各项技术指标均达到用户的要求。