检索结果-南通市图书馆

Influence of Formate on Bioactivity Material-thuringiensin Synthesized by Bacillus thuringiensis YBT-032

在线全文

学校读者我要写书评

暂无评论

Journal of wuhan university of {2.(Materials Science) 2008年第5期23卷 691-693页

作者：王志喻子牛 College of Bioengineering Hubei University of Technology State Key Laboratoy of Agricultural Microbiology National engineering Research Center for Microbial Posticides Huazhong Agricultural University

The biological method to synthesize thuringiensin and the influence of formate on thuringiensin biosynthesis were investigated. Addition of 1.00 g/L formate to growth medium of bacillus thuringiensis YBT-032.resulted in significant enhancements in productions of citrate, α -ketoglutarate, intracellular adenine and thuringiensin. These results demonstrate that added formate attends metabolism of cell, facilitates carbon metabolic flux in tricarboxylic acid cycle and hexose monophosphate pathway. As a carbon source, formate facilitates cell growth, increases glucose consumption and enhances the ability of cell to synthesis adenine analogues, and subsequently thuringiensin. Thuringiensin production rate significantly enhanced from 6.44 to 8.46 mg·g^-1 · h and transformation ratio from glucose to thuringiensin increased by 43.30%.

关键词： bacillus thuringiensis precursor formate thuringiensin

Analysis on cohesive crack opening displacement considering the strain softening effect

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2006年第1期49卷 88-101页

作者： WANG Limin1, XU Shilang2.& ZHAO Xiqiang3 1. Mechanics Department, Shandong university of technology, Zibo 2.5049,{2. 2. Civil engineering Department, Dalian university of technology, Dalian 11602.,{2. 3. Mathematics Department, Ocean university of{2., Qingdao 2.6071,{2. Mechanics Department Shandong University of Technology Zibo 255049 China Civil engineering Department Dalian University of Technology Dalian 116024 China Mathematics Department Ocean University of China Qingdao 266071 China

In order to investigate the crack propagation in quasi-brittle materials like rock, ceramic and concrete, Hillerborg and his co-researchers abstracted the fracture process zone in front of a stress free crack in terms of a “fictitious crack zone”. On the fictitious crack zone, cohesive stresses distribute following a given softening relationship of stress vs. crack opening. Based on the polynomial or power series expression of cohesive crack opening displacement, the relationship of the cohesive stress vs. the crack opening displacement is established using elastic theory and integral equation, and some unknown physics variables are obtained using variation approach. The calculation results gained in this paper are close to the experimentally test ones.

关键词： cohesive crack, softening, dissipation work, variation approach.

Multi-materials drop-on-demand inkjet technology based on pneumatic diaphragm actuator

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第6期53卷 1605-1611页

作者： XIE Dan1,2.ZHANG HongHai1,2.SHU XiaYun1,2.Xiao JunFeng1,2.& CAO Shu1,2.1institute of Micro-Systems,School of Mechanical Science and engineering,{2. university of Science and technology,wuhan 43.074,china 2.5} National Laboratory for Optoelectronics,wuhan 43.074,china 1. institute of Micro-Systems School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China2. Wuhan National Laboratory for Optoelectronics Wuhan 430074 China

Micro-droplet jetting belongs to the field of precision fluid dispensing *** traditional subtraction manufacture process,micro-droplet jetting as an additive fabrication technique with features of non-contact and data-driven represents a new development trend of modern manufacturing *** this paper,the design,fabrication and performance of a multi-materials drop-on-demand (DOD) inkjet system based on pneumatic diaphragm actuator were *** capturing the droplet ejection process and measuring the droplet dimension,a self-made in situ imaging system based on time delayed external trigger was set *** performance of the generator was studied by adjusting the structure and control ***,the influence of fluid properties on the droplet ejection process was experimentally ***-solderballs of 160.5 μm in diameter and UV curing adhesive micro-bumps of 346.94 μm in contact diameter with the substrate were *** results demonstrated that the DOD inkjet generator possesses characteristics of robust,easy to operate and maintain,and able to withstand high temperature as well as applicability to a wide variety of materials including polymers,low melting point resin and high melting point *** system has a great potential of being used in the fields of IC and MEMS packaging,3D printing,organic semiconductor fabrication,and biological and chemical analysis.

关键词： micro-droplet jetting drop on demand pneumatic diaphragm actuator multi-materials

Assessing a soft twin tunneling numerical model using field data

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2009年第1期21卷 36-41页

作者： Ke-shuan Ma1,2.Lie-yun Ding11. School of Civil engineering and Mechanics,Hubei Key Laboratory of Control Structure, huazhong {2. of Science & technology, wuhan 43.074, china 2. Department of Civil engineering, Nanyang institute of technology, Nanyang 473004, china. School of Civil engineering and Mechanics Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 China Department of Civil engineering Nanyang Institute of Technology Nanyang 473004 China

Using a five-floor building affected by the Yangtze River highway tunnels in wuhan as the engineering background, we have constructed a free-field model and a coupled model to study the soil, lining, foundations and upper structure, and analyze the rules of movements of building foundation and ground induced by single tunnel and twin tunnel excavation with the Finite Element Analysis method. It is shown that for the coupled model, the longitudinal displacement of each foundation increases slowly when the tunnel face gets close to the foundation section and then increases fast when the tunnel face moves away from the foundation during the single and twin tunneling. For a single tunnel, the surface settlements are overestimated by the free-field and coupled tunnel. This might be crucial in urban areas. Regarding the maximum settlements and the width of the settlement trough, the difference between the free-field model and the coupled model is quite obvious. This comparison with the field measurement value reveals that the coupled model seems to be superior to the free-field model. These results are of instructive significance for design and excavation.

关键词： finite element analysis three-dimensional slurry shield tunneling building settlement

Numerical　Simulation　and　Analysis　on　Deflection　of　Silicon　Mirrors　Irradiated　by　High　Power　laser

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of lasers 1995年第5期B4卷 423-430页

作者： XIA Jinan CHENG Zuhai QIU Junlin (National Laboratory of laser technology,{2. university of Science and technology,wuhan 43.074,china) huazhong Univ of Science and Technology Wuhan China

ＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎａｎｄＡｎａｌｙｓｉｓｏｎＤｅｆｌｅｃｔｉｏｎｏｆＳｉｌｉｃｏｎＭｉｒｒｏｒｓＩｒｒａｄｉａｔｅｄｂｙＨｉｇｈＰｏｗｅｒＬａｓｅｒＸＩＡＪｉｎａｎ；ＣＨＥＮＧＺｕｈａｉ；ＱＩＵＪ... 详细信息

ＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎａｎｄＡｎａｌｙｓｉｓｏｎＤｅｆｌｅｃｔｉｏｎｏｆＳｉｌｉｃｏｎＭｉｒｒｏｒｓＩｒｒａｄｉａｔｅｄｂｙＨｉｇｈＰｏｗｅｒＬａｓｅｒＸＩＡＪｉｎａｎ；ＣＨＥＮＧＺｕｈａｉ；ＱＩＵＪｕｎｌｉｎ（ＮａｔｉｏｎａｌＬａｂ...

关键词： high power laser silicon mirror mirror deflection

Relationship between Retrographical and Physical Properties of Aggregates

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of wuhan university of {2.(Materials Science) 2010年第4期25卷 678-681页

作者：庞凌 School of Sciences Wuhan University of Technology

The relationship between petrographical and physical properties of limestone, basalt, granite and gneiss was investigated. Petrographical data were quantified from polished thin sections with a polarising microscope to determine the modal composition. The properties of resistance to fragmentation and abrasion were determined by Los Angeles abrasion test and crushing test. The shape characteristic was measured by Flakiness index test. The experimental results indicate that abundance of fineto medium-grained minerals （especially of plagioclase, quartz and feldspar） are prime, and strong micrographic intergrowth texture with interlocking grain boundaries have the great positive influence on the physical properties. It is also indicated that petrographical properties and surface texture of rocks can decide the potentiality of rocks as raw materials with high quality on resisting fragmentation and abrasion. Analysis of Integration of petrographical data and mechanical properties is ideal for the selection of aggregates used in asphalt concrete.

关键词： aggregate petrography physical properties flakiness index

Magnetron sputtering synthesis of large area well-ordered boron nanowire arrays

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2004年第4期47卷 403-415页

作者： CAO Limin1,2. ZHANG Ze2.& WANG Wenkui1,2.1. Key Laboratory of Metastable Materials Science and technology and College of Materials Science and engineering, Yanshan {2., Qinhuangdao 066004, china 2. institute of Physics, Chinese Academy of Sciences, Beijing 100080, china 1. Key Laboratory of Metastable Materials Science and technology and College of Materials Science and engineering Yanshan University 066004 Qinhuangdao China 2. institute of Physics Chinese Academy of Sciences 100080 Beijing China

One-dimensionally nanostructured materials, such as nanowires and nanotubes, are the smallest dimensional structures for efficient transport of electrons and excitons, and are therefore critical building blocks for nanoscale electronic and mechanical devices. In this paper, boron nanowires with uniform diameters from 2. to 80 nm were synthesized by radio-frequency magnetron sputtering of pure boron powder and B2.3 powder mixtures in argon atmosphere. The boron nanowires produced stand vertically on the substrate surface to form well-ordered arrays over large areas with self- organized arrangements without involvement of any template and patterned catalyst. The high-density boron nanowires are parallel to each other and well distributed, forming highly ordered and uniform arrays. A more interesting and unique feature of the boron nanowires is that most of their tips are flat rather than hemispherical in morphologies. Detailed studies on its structure and composition indicate that boron nanowires are amorphous. Boron nanowire appears as a new member in the family of one-dimensional nanostructures. Considering the unique properties of boron-rich solids and other nanostructures, it is reasonable to expect that the boron nanowires will display some exceptional and interesting properties. A vapor-cluster-solid (VCS) mechanism was proposed to explain the growth of boron nanowires based on our experimental observations.

关键词： boron nanowires, magnetron sputtering, arrays, self-assembly.

Electrical Measurement to Assess Hydration Process and the Porosity Formation

在线全文

学校读者我要写书评

暂无评论

Journal of wuhan university of {2.(Materials Science) 2008年第5期23卷 761-766页

作者：魏小胜 Department of Civil engineering Huazhong University of Science and Technology

The change of electrical resistivity with time at early ages was used to investigate the hydration process and the porosity development. Porosity reduction process of cement-based materials hydration was developed by a proposed method. The porosity reduction is fast at the setting period. The results find that the pore discontinuity occurs faster at lower water/cement ratios than at higher water/cement ratios which is similar to the results of the Percolation method.

关键词： electrical resistivity hydration setting time percolation

Chuetsu earthquake damages in Niigata County of Japan

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第10期17卷 1255-1259页

作者： Li Hongnan1, Zhao Yangang2.and Wang Guoxin1(1. State Key Laboratory of Coastal and Offshore engineering, Dalian university of {2., Dalian 11602., china 2. Department of Civil and Architectural engineering, Nagoya institute of {2., Nagoya 466-8555, Japan) State Key Laboratory of Coastal and Offshore engineering Dalian University of Technology Dalian 116024 China Department of Civil and Architectural engineering Nagoya Institute of Technology Nagoya 466-8555 Japan

An Earthquake ML=6.8 occurred on October 2., 2.04 in Chuetsu area of Niigata County in Japan, which caused 40 people dead, more than 4500 people injured and 1000000 people homeless; nearly 140000 buildings were damaged or collapsed. The estated total loss of this earthquake was about 3000 billions Yen. In this paper, we investigate the Chuetsu earthquake damage from different aspects, including the seismic outline, seismicity, intensity distribution, wave feature, damage analyses, and economic losses. Finally, experiences and lessons from the earthquake damage are given. The content in this paper may be a reference for structural seismic design and code modification.

关键词： Chuetsu earthquake seismic damage Niigata province in Japan.