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Application of Molecular Biology and Nanotechnology in Bioaerosol Field

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Application of Molecular Biology and Nanotechnology in Bioae...

LOAD SHARING AND contact OF HOURGLASS WORM GEARING

第六届全国环境化学大会暨环境科学仪器与分析仪器展览会

作者： Fangxia Shen,Zhenqiang Xu,Qi Chen,Yan Wu,and Maosheng Yao~* (Principal contact:Maosheng Yao,Professor,1State key Joint Laboratory for Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China,]

＜正＞Numerous threats from biological aerosol exposures,such as H1N1 influenza,SARS,bird flu,and bio-terrorism necessitate the development of a real-time bioaerosol sensing system, which however is a long standing challenge in the field.Here,we reported real-time detection of airborne influenza H3N2 viruses by integrating electrically addressable silicon nanowire（SiNW） sensor devices with microfluidics and a bioaerosol-to-hydrosol air sampling system.Influenza A viruses were

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Chinese Journal of Mechanical Engineering 1999年第4期12卷 260-265页

作者： QinDatong QinDongxing State key Lab of Mechanical Transmission, Chongqing University 重庆大学机械传动国家重点实验室重庆 400044 重庆大学机械传动国家重点实验室重庆

Based on solid modeling, the geometry and the FE model of the hourglass worm gearing are established. By the hybrid method of FEM and penalty function, the load sharing among tooth paris and the stress of contact teeth are calculated, the contact zones and the distribution of the contact pressure are investigated. The variation of the contact states with the load is investigated by comparision of its contact patterns under different loads.

关键词： Hourglass worm gearing Load sharing Stress contact pressure

Paper sludge as a feasible soil amendment for the immobilization of Pb^(2+)

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Journal of Environmental Sciences 2010年第3期22卷 413-420页

作者： Xiaojia He, Lei Yao, Zhu Liang, Jinren NiThe key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing 100871, China. The key Laboratory of Water and Sediment Sciences Ministry of Education Department of Environmental Engineering Peking University Beijing 100871 China

The possibility of amending Pb 2＋ contaminated soil （S） with paper sludge （P） was investigated through adsorption and desorption experiments. The adsorption process of Pb 2＋ in soil containing paper sludge （SP） could be well described by pseudo second-order kinetic model and the Langmuir isotherm model. After P addition, the equilibrium time decreased greatly （from 28 to 8 hr） and the Pb 2＋ maximum adsorbed amount （Q max ） increased by a factor of more than three to 102.04 mg/g. Q max reached its maximum as S：P was 9：1 （m/m） after 10 days contact between S and P. Moreover, Pb 2＋ adsorbed amount increased with the rise of pH during the adsorption process. Desorption experiments indicated that Pb 2＋ adsorption in SP was irreversible. The metal ion fraction was analyzed with Energy Dispersive Spectrometer and Environmental Scan Electron Microscope. As a result, the addition of P to soil was found to induce a decrease in the mobile forms. The Pb 2＋ complexes formation in the presence of carbonates was the main adsorption mechanism. Overall, the paper sludge could be one of the promising soil amendments for the remediation of soil with Pb 2＋ contamination.

关键词： paper sludge pb^2＋ adsorption

Influence of Vanadium Element on Microstructure of Electron Beam Welded Titanium Alloy to Stainless Steel Joint

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稀有金属材料与工程 2011年第S4期40卷 49-53页

作者： Wang Ting,Zhang Binggang,Chen Guoqing,Feng Jicai State key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol State Key Lab Adv Welding & Joining Harbin 150001 Peoples R China

Electron beam welding experiments of titanium alloys with different vanadium content to stainless steel,as well as alpha titanium to stainless steel using vanadium sheets as filler metal and transition portion were carried out.Microstructures of the joints were examined by scanning electron microscope.The properties were evaluated by microhardness and tensile strength.It was shown that electron beam welding is not feasible due to the brittle Ti-Fe intermetallics with high hardness.Increase of vanadium content in base metal can restrain but can't avoid the formation of cracks.When vanadium content was too large,the joint was embrittled by FeTi compound with supersaturated V and also cracked after welding.Crack free joint was achieved by using vanadium transition portion which can prevent the contact of Ti and Fe elements.However,the formation of brittle σ intermetallics reduced the tensile strength of the joint,only up to 134MPa.

关键词： titanium alloy stainless steel vanadium content microstructure mechanical properties

EXPERIMENT OF IMPACT OF RIVER HYDRAULIC CHARACTERISTICS ON NUTRIENTS PURIFICATION COEFFICIENT

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Journal of Hydrodynamics 2007年第3期19卷 387-393页

作者： WANG Pei-fang WANG Xiao-rong WANG Chao State key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210093 China State key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China key Laboratory of Intergrated Regulation and Resource Development on Shallow Lakes College of Environmental Science and Engineering Hohai University Nanjing 210098 China

Hydraulic characteristics of a river are the key factors for river water quality improvement and river restoration. A simulated river was exploited to study the interactions between water contaminant purification coefficients and the characteristics of the river, such as the cross-section velocity, water depth, Reynolds number, and Froude number. To enhance the purification capacity of the river, detritus with 5 mm to 10 mm in diameter and contact surface area per volume of 87.6 m^2/m^3 were constructed naturally at the bed and along one side of the bank to form half shape of the river cross-section. During the one-month experiment （including 3 periods） from the third of November to the fourth of December, 2005, three categories of hydraulic conditions were investigated. Results show that the purification coefficient （K） of Total Nitrogen （TN） is closely coherent with the hydraulic retention time （T）, river length （L）, Reynolds number （Re） and Froude number （Fr）. The relationship of K and T generally agrees with the power law under the three experimental water hydraulic conditions. Based on these results, the optimal Re and Fr ranges can be obtain to serve as a guideline for ecological re-engineering design to improve river water quality and restore river ecosystem.

关键词： Hydraulic characteristics total nitrogen,purification coefficient interaction simulated river

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基于余数定理的叶端定时欠采样信号处理方法

振动．测试与诊断 2013年第S1期33卷 128-131,225页

作者：陈仲生谢勇杨拥民李学军国防科学技术大学装备综合保障技术重点实验室长沙410073 湖南科技大学机械设备健康维护湖南省重点实验室湘潭411201

提出了一种基于余数定理的叶端定时欠采样信号处理方法,该方法仅根据两组欠采样频率下的振动信号频谱信息,通过简单运算即可直接计算叶片的振动频率,优于传统的"动频+静频"方法,并利用"3+2"两组叶端定时传感器数据进行了仿真,结果验证... 详细信息

提出了一种基于余数定理的叶端定时欠采样信号处理方法,该方法仅根据两组欠采样频率下的振动信号频谱信息,通过简单运算即可直接计算叶片的振动频率,优于传统的"动频+静频"方法,并利用"3+2"两组叶端定时传感器数据进行了仿真,结果验证了其有效性。

关键词：叶片振动叶端定时欠采样信号余数定理

Mitochondrial membrane fusion and ATP synthesis both compete for interfacial △pH of PMF,but not △Ψ:An Inter-play between membrane fusion and energy coupling of mitochondria

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生物物理学报 2009年第S1期25卷 217-218页

作者： Shusen Liu State key Laboratory of Biomembrane and Membrane Biotechnology, Instutute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China

Although some fusogenic proteins have been established to tether two opposite outer or inner mitochondrial membranes into contact, a prerequisite for whole mitochondrial fusion events,

关键词： Mitochondrial membrane fusion Protein-tethering Lipid-bilayer-mixing and fusion Interfacial △pH of PMF.Inter-play between membrane fusion and ATP synthesis.

Influence of Surface Condition on Expulsion in Spot Welding AZ31B Magnesium Alloy

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Journal of Materials Science & Technology 2005年第5期21卷 749-752页

作者： Yarong WANG, Jicai FENG and Zhongdian ZHANGState key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China State key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China

Experiments were carried out to study the influence of surface condition on expulsion during the spot welding of AZ31B Mg alloy. A general electrical contact resistance theory for conductive rough surfaces and the relation between maximum temperature Tm in the contact and voltage-drop V across interface of two surfaces were employed to understand the reason of expulsion in Mg alloy spot welding. The main reason of expulsion is that the high electrical contact resistance induced by large roughness of the surface and oxide film covered on the surface leads to local melting of metal in the interface of two surfaces, and liquid metal of the local area ejected from the specimen under electrode force forms expulsion.

关键词： Expulsion Magnesium alloy Spot-welding Electrical contact resistance

A New Model of Interfacial Physical contact in Diffusion Bonding

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Journal of Materials Science & Technology 2004年第1期20卷 109-112页

作者： Peng HE, Jicai FENG and Yiyu QIANNational key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China Lab. of Adv. Welding Technol. Harbin Inst. of Technol. Harbin 150001 China

Through eliminating voids not affecting the primary bonding process, and incorporating interlayer and flexible base material, the interface geometry character and brief mathematics process were put forth. Through analyzing contact process of diffusion bonding, contact area model was settled. It can interpret the phenomenon of different interface areas taking on different strengths. In the course of physical contact, shear stresses serve an important function for the plastic deformation and the cohesion of interface voids.

关键词： Diffusion bonding Physical contact Interface layer