建筑工程质量保险制度的效用与成本研究

运用外部性理论，从社会成本与社会福利变化的角度分析了建筑工程质量缺陷造成外部不经济的机理以及建筑工程质量保险制度对减少这一负面效应的作用，论证了质量保险制度的实施是必要和有价值的．同时，对质量保险制度本身成本的本质进行了深入分析，认为质量保险制度本身成本为制度的实施带来的阻力并提出了相关对策，为我国质量保险制度的建立和发展提供了理论和实践依据．     

论高校实验室软件建设

高校实验室的软件建设,涉及实验室硬件运行的质量和效率,关系到实验室资源的优化配置和持续发展。文章从实验室管理制度、实验室队伍、实验室方法、实验室间的联合运作及外部联系五个方面,提出了相应的建设思路和应用策略,总结了实验室软件建设在整个实验室建设中的重要地位。     

Use of diffusion‐ordered NMR spectroscopy and HPLC–UV–SPE–NMR to identify undeclared synthetic drugs in medicines illegally sold as phytotherapies

The informal (and/or illegal) e‐commerce of pharmaceutical formulations causes problems that governmental health agencies find hard to control, one of which concerns formulas sold as natural products. The purpose of this work was to explore the advantages and limitations of DOSY and HPLC–UV–SPE–NMR. These techniques were used to identify the components of a formula illegally marketed in Brazil as an herbal medicine possessing anti‐inflammatory and analgesic properties. DOSY was able to detect the major components present at higher concentrations. Complete characterization was achieved using HPLC–UV–SPE–NMR, and 1D and 2D NMR analyses enabled the identification of known synthetic drugs. These were ranitidine and a mixture of orphenadrine citrate, piroxicam, and dexamethasone, which are co‐formulated in a remedy called Rheumazim that is used to relieve severe pain, but it is prohibited in Brazil because of a lack of sufficient pharmacokinetic and pharmacodynamic information. Copyright © 2013 John Wiley & Sons, Ltd.     

矿井通风设施外部漏风的检测方法研究

矿井外部漏风率大小是衡量主要通风机运行状况和通风管理水平的重要指标之一,其测定方法的选择是现场技术人员进行漏风测定时面临的首要问题。依据矿井通风原理,分析了各种外部漏风测试方法的原理、步骤、适用条件。以五沟煤矿外部漏风测定为实例,论述其方法选择的依据和过程。现场测试结果表明:在1#风机和2#风机运行状态下矿井外部漏风率分别为8.4%和7.85%,其中备用风机的装置漏风是主要的漏风源,必须采取有针对性的措施予以治理。测试结果对消除矿井漏风隐患、优化矿井通风系统提供科学的现场依据。     

乡村社区秩序重塑:外部干预与农户生计的互动

来自市场或者外部干预的力量与社区乡土文化和知识影响下的农户生计选择进行着最大限度互动,引导和催化着社区秩序重塑。不过,这种重塑可能由于外部干预受到激发,但并不是外部干预的必然结果,它是一个不间断的过程,在社区内部的冲突和协调下又会产生新一轮的重塑。     

在青藏高原引进外来畜种发展畜牧业的一个建议

青藏高原自然条件恶劣 ,不宜农耕 ,大部分地区以畜牧业为主 但发展传统畜牧业无论从畜牧条件 ,还是交通条件来讲 ,都远不如内蒙、新疆 因此 ,要因地制宜 ,扬长短避 ,实施“人无我有”的发展方针 通过自然条件与青藏高原相似的南美洲安第斯山中段地区的调查 ,可以看出 ,青藏高原引进其特有的驼科动物羊驼、小羊驼和骆马具有可行性 :其不仅适宜在青藏高原生长 ,还有很高的经济价值和广阔的市场 .从长远看 ,还会产生积极的政治意义     

A simple method to construct soliton-like solution of the general KdV equation with external force

A simple and direct method is described to construct the soliton-like solution for the general KdV equation with external force. Crucial to the method is the assumption that the solution chosen is a special truncated expansion.     

Transition to turbulence, small disturbances, and sensitivity analysis I: A motivating problem

For over 100 years, researchers have attempted to predict transition to turbulence in fluid flows by analyzing the spectrum of the linearized Navier-Stokes equations. However, for many simple flows this approach fails to match experimental results. Recently, new scenarios for transition have been proposed that are based on the interaction of the linearized equations of motion with small disturbances to the flow system. These new “mostly linear” theories have increased our understanding of the transition process, but the role of nonlinearity has not been explored in detail. This paper is the first of a two part work in which sensitivity analysis is used to study the effects of small disturbances on transition to turbulence. In this part, we study a highly sensitive one-dimensional Burgers' equation as a motivating problem. Sensitivity analysis is used to predict the large changes in solutions in the presence of a small disturbance. Also, sensitivity analysis is shown to provide more information about the disturbed nonlinear problem than a purely linear analysis of the problem. In the second part of this work, this analysis will be extended to the three-dimensional Navier-Stokes equations to show that small disturbances have great potential to trigger transition to turbulence.     

建筑外墙渗漏的预防要点

外墙砖砌体渗水是工程建设中经常遇到的问题,严重的影响了建筑的使用功能。本文介绍了外墙渗水的诸多原因及预防措施。     

体外反搏对犬动脉剪切应力参数的影响

为研究体外反搏对不同情况下剪切应力参数的影响，对18条开胸犬实时测量颈主动脉，头臂干和胸主动脉等处的血流量，计算出各处剪切应力的变化，结果表明，急性心肌缺血和体外反搏可以使剪切应力的平均值，变化范围和变化速率发生变化，即改变了剪切应力的脉动性。