Collection efficiency of liquid‐based samplers for fungi in indoor air

This study assessed the collection efficiency (CE) of two popularly used sampling devices (BioSampler and Coriolis sampler) for fungal aerosols. Phosphate‐buffered saline (PBS) supplemented with or without surfactant (Tween‐20, Tween‐80, or Triton X‐100) and antifoam agent was prepared and used as collection liquids. The agar impactor (BioStage) was simultaneously operated with liquid‐based samplers to collect fungi from seven sites located at a university building, public library, and animal farming. Fungal concentrations determined by liquid samplers were divided by those by BioStage, and the ratio values represented CE. Results indicate that the CE of BioSampler was superior to that of Coriolis (P = 0.0001) and the PBS containing surfactant collected fungi better than that without surfactant (P < 0.0001), whereas antifoam agent showed no influence (P = 0.8). Moreover, fungal concentrations determined by BioSampler with surfactant‐added PBS were statistically indifferent from those by BioStage (P > 0.05) with a Spearman correlation coefficient of 0.81‐0.83 (P < 0.01). In addition to sampler and collection liquid, sampling location was also identified as a significant CE factor (P = 0.006), implying potential influences by fungal genera in the studied fields. Overall, BioSampler with surfactant‐supplemented PBS (eg, Triton X‐100) is recommended considering the great CE and compatibility with a variety of analytical assays.     

地方高校建筑学专业教育教学改革的探索

该文从高等教育发展方向着手,分析目前建筑教育存在的问题,根据社会对建筑学人才的需求,并有针对性地对建筑学专业的教育模式、教学理念、课程设置、教学方法等方面进行改革,紧跟国际先进高等教育的思想,不断探索,以适应社会的需求。     

浅析国防科研试验工程建设项目中的监理模式

简要介绍了某部队单位自建方式的特点,并分析了其工程监理的优势,指出了在实际实施运行中存在的问题,并给出了解决问题的建议和对策,希望使之健全和完善,使其在该部队国防科研试验工程的质量管理中发挥更大的作用。     

Precision Measurements of Time Characteristics of ETL9351 Photomultipliers

The measured characteristics of 2200 photomultiplier tubes (PMTs) for the future Borexino experiment are considered to provide the most complete information for evaluating the time characteristics of ETL9351 PMTs with a high precision. The unique time characteristics of the apparatus used and the large statistics obtained during the tests of the PMTs allow the fine structure of the PMT time response to be resolved. A method for obtaining the probability density function of the single-photoelectron counting from the experimental data is proposed and used to derive the PMT average characteristics. For the first time, an analytical model is proposed to describe all the features of the single-photoelectron PMT time response. The origin of small-amplitude pulses, as well as the shape of the time spectra of PMT, is explained.     

二维异形切割件优化排样的拟合算法

多种异形零件在钢板上的优化排样问题 ,实际上也可看作多边形(异形零件的外轮廓 )对多边形 (矩形 )的最优填充问题。从拼图游戏的启发构造了一个异形零件优化排样的拟合算法。用该算法对一些优化排样问题进行了计算 ,得到较为满意的结果     

大学校园建筑创作的适度思想

以现代大学校园建设的快速发展为背景,针对目前存在的实际问题,提出了建筑创作过程中的适度思想。结合作品分析和创作实践体验,从时间维度、场所精神、功效控制、生长过程四个方面阐释了建筑创作适度思想内涵。     

科学计算可视化在有限元分析中的应用

简要介绍了科学计算可视化技术 ,对于它在有限元分析中的应用作了阐述。并对其中几种可视化方法的流程作了描述 ,指出该技术便于工程设计人员对计算结果的合理性进行有效的分析与校核     

通风空调系统风机风压的选择

通过对三种风道系统的压力进行分析,认为应根据风机全压等于风管系统阻力损失来选择风机.     

活性粉末混凝土的制备技术与力学性能研究

利用低成本天然掺合料、在标准成型工艺和热水养护条件下制备出高性能的活性粉末混凝土(Reactive Powder Concrete)。通过详细地测试RPC立方体抗压强度、圆柱体轴心抗压强度、劈拉强度、弯折强度、弹性模量,对这些物理量随钢纤维体积掺量变化的规律进行分析。研究表明,在同时满足高性能、和易性和经济要求的前提下,钢纤维体积掺量宜控制在1%~2%。给出了RPC强度和弹性模量随钢纤维体积掺量变化的经验表达式。     

加工TiNi形状记忆丝的新工艺

采用模拟试样研究了Ti/TiAl、Nb/TiAl和NbTi/TiAl 3种复合材料的界面特性。结果表明,爆炸试样的界面反应层厚度远小于热等静压试样的界面反应层厚度。在同一条件下热等静压成型的这3种复合材料,其界面差异明显:Ti/TiAl和NbTi/TiAl试样的界面反应层较厚,界面结合强度较高;Nb/TiAl试样的界面反应层较薄,界面结合强度较低。