SPF级实验动物房的压差控制及节能设计

结合SPF级实验用动物房的洁净空调设计实例,探讨了在满足工艺要求的前提下,采用三级压差控制和变风量系统所达到的理想的压力梯度及节能效果;实际工程测试数据表明,采用上述方法并结合BA技术,可实现系统运行自动控制和设计目标.     

南京德基广场二期裙楼结构设计

南京德基广场二期裙楼为多项不规则的复杂高层建筑,采用钢筋混凝土框架-剪力墙结构体系,通过设置后浇带、采取必要的构造措施、调整结构构件刚度、提高结构的抗扭承载力以及采用空间有限元法和时程法进行分析,解决了设计中结构超长、超限、大悬挑及扭转效应明显等问题,使结构满足抗震设防要求。     

AP1000结构模块双相不锈钢腐蚀及防护

在AP1000结构模块的湿面采用了大量的双相不锈钢作为墙体材料以提高其抗腐蚀能力,但是由于各种施工活动的影响,不可避免地会破坏双相不锈钢表面的钝化膜,从而造成腐蚀。通过对双相不锈钢的腐蚀情况进行分析,采取了相应的酸洗钝化措施,恢复其表面钝化膜,并对成品保护提出了要求,对提高工程质量具有重要意义。     

450mm热连轧机组轧制带钢拓宽分析

讨论了邯郸钢铁公司一轧厂450mm热连轧带钢的拓宽问题；对该机组及其φ500mm开坯机进行了现场测试，并在计算机上进行了带钢拓宽模拟轧制，得出了该机组的最大轧制负荷及其带钢的拓宽限度。     

摩梭文化习俗影响下的摩梭民居

民居是特定地域社会文化的映射,位于我国云南省宁蒗县与四川省盐源县交界处存在着一个至今还保持着母系氏族大家庭的"国度"--"摩梭女儿国".摩梭村寨中的摩梭民居介入和融合了摩梭文化习俗,形成了独特的建筑文化圈.该文对摩梭村落选址聚落、摩梭民居类型、居室功能、基本构造和建筑装饰及其民俗承传作了初步研究.     

Influence of damages on static behavior of single-layer cable net supported glass curtain wall: full-scale model test

The single-layer cable net supported glass curtain wall has been applied in many building structures all over the world. In service, it will inevitably be subject to various damages. To study the influence of such damages on the static behavior of the single-layer cable net supported glass curtain wall, a full-scale model with the outside outline size of 4.85 m × 4.85 m and 4 × 4 grids is designed and tested. Two kinds of damages that are the cable prestress loss and cable anchorage end failure are led into the structure model during the test, and their influence has been investigated. The stiffness contribution of glass panels to the single-layer cable net supported glass curtain wall structure with or without damages and its change have been tested and analyzed. The results show that the maximum change rate of nodal deflection is 13.78% for the damage of cable prestress loss, while the change rate of nodal deflection is between 7% and 22% for the damage of cable anchorage end failure. The influence degree of the damages depends on the ratio of the structure initial stress stiffness change caused by damages to the total stiffness of the structure. The stiffness contribution of glass panels increases with the load increase. Under the same loading condition, the stiffness contribution of glass panels to the damaged structure is greater than that to the intact structure. The stiffness contribution of glass panels reduces the effect of the damages on the structural displacement and the cable tension force, but the glass panel could break if its stiffness contribution is too large.     

Contribution of Streptomyces in sediment to earthy odor in the overlying water in Xionghe Reservoir, China

Musty and earthy odors frequently characterize the source water and fish of the Xionghe Reservoir in China. Although odorous compounds and odor-producing cyanobacteria have been analyzed in surface water, potential odorants in sediments and their contribution to the water body have remained uninvestigated. In this study, we examined the odorous compounds and possible odor-producers in the sediments and overlying water of Xionghe Reservoir from November 2007 to October 2008. High concentrations of geosmin (up to 5280.1 ng kg⁻¹ dw⁻¹) were detected in sediments, and eight strains of Streptomyces isolated from sediments were verified as producers of geosmin and/or 2-MIB in M liquid medium by HSPME-GC-MS. Geosmin concentrations in the overlying water were correlated with those in the sediments (r = 0.838, p < 0.05). In vitro studies showed that geosmin in the overlying water was released from the sediment, and that within 12 days the amount released from the sediment was 21.4–51.4%. Concentrations of geosmin in sediments were positively correlated with organic matter (r = 0.642, p < 0.01), total nitrogen (r = 0.606, p < 0.01) and Chl a (r = 0.674, p < 0.01), and were negatively associated with temperature (r = −0.425, p < 0.05). This study indicates that odorous compounds that are released from sediments should be taken into account when assessing the sources of these odorants in waters.     

钢结构事故诊断分析初探

随着钢结构的发展,钢结构工程不断兴建,钢结构事故频繁发生。顺利检查建筑结构的破损位置,即迅速准确地诊断故障与快速确定排故方法,可以为钢结构破损加固与事故处理提供有效的建议。在检测分析了多个钢结构事故的基础上,对涉及钢结构破损故障诊断的一些方面进行了初步探讨。     

工程建设主体对公路工程造价的管理与控制

对公路工程造价、施工成本及其综合管理与控制的内容做了概略的论述,按照建设单位和施工企业的职能,提出了建设单位对投资估算、设计概算、施工图预算、工程价款结算和竣工决算的编制与控制的措施,从而取得最大的投资效益。