检索结果-南通市图书馆

lES investigation of swirl intensity effect on unconfined turbulent swirling premix.d flame

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第33期59卷 4550-4558页

作者： Zhihua Wang Yanwei x. Yu l Zhijun zhou Junhu zhou Kefa Cen State Key laboratory of Clean Energy Utilization Zhejiang University

A finite reaction rate model is presented as a closure of large eddy simulation(lES) to numerically study an open premix.d methane/air swirling flame. The resultant model is firstly validated by comparing with reported data and then employed to investigate the effect of swirling intensity on flow field, flame characteristics and combustion instability of the swirling flame. Three different swirl numbers are considered. The lES results show that as swirling intensity increases, the vortex.entrainment and micro-mix.ng are enhanced, leading to more lean equivalent ratios at flame front; consequently, higher swirling number causes lower flame temperatures and slower CO ox.dization; for all simulated swirl numbers,flame fronts are completely located out of the recirculation zones and anchored at the inner surface of the annular swirling steams; swirl number has a crucial effect on swirling flame ex.ension toward radial and tangential dimensions and then significantly affects streamwise flame length, which is a great influencing factor on combustion instability; vortex.induced disturbance on flame in streamwise plays a critical role in combustion instability.

关键词：预混火焰旋流强度 lES 漩涡燃烧不稳定性潜水大涡模拟速率模型

Biochemical composition of the brown tide causative species Aureococcus anophagef ferens cultivated in dif ferent nitrogen sources

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2022年第6期40卷 2189-2201页

作者： Jian GAO Yuelei DONG x.aoyu zhou lei CUI Songhui lÜ Research Center of Harmful Algae and Marine Biology College of Life Science and TechnologyJinan UniversityGuangzhou 510632China Southern Marine Science and Engineering Guangdong laboratory Zhuhai 519000China Key laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China

A large-scale algal bloom,caused by Aureococcus anophagefferens,has plagued the coastal embayment of Qinhuangdao,China since *** bay scallop agriculture industry in this area has been adversely *** claimed that the poor nutritional value of brown tide cells might be responsible for the detrimental effects on bivalve *** verify whether brown tide cells are nutritionally inadequate food sources,the biochemical composition(total ex.ractable lipids,amino acids,fatty acids,and monomeric carbohydrates)of the Chinese strain *** was determined during the late logarithmic growth phase when culturing in different nitrogen sources(nitrate,urea and nitrate-urea mix.ure).Cells cultured in nitrate contained 39.12%protein,21.99%total ex.ractable lipid,10.25% total carbohydrates,and a relatively high amount of polyunsaturated fatty acid(PUFA)(51.98%,percentage of total fatty acids),including eicosapentaenoic acid(EPA)(4.81%)and docosahex.enoic acid(DHA)(14.56%).The gross biochemical composition and PUFA content in *** in nitrate cultivation are comparable with values found in the literature of frequently used species in bivalve *** monomeric carbohydrates were significantly reduced when cultivated in urea and nitrate-urea mix.ure(Ply decreased when cultivated in urea(Plthough the nutritional value of *** dropped when cultured in urea,it is still comparable with certain favorably used algal species in bivalve feeding(i.e.,Skeletonema costatum),indicating that *** is not a nutritionally inadequate food source.

关键词： brown tide Aureococcus anophagef ferens fatty acid carbohydrate nutritional value

INFlUENCE OF FIBER COATING ON TENSIlE BEHAVIOR OF UNIDIRECTIONAl C/Mg COMPOSITES

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 1997年第5期10卷 398-402页

作者： Zhang, K. Wang, Y.Q. zhou, B.l. zhou, Y.H. li, H.l. Inst of Metal Research Chinese Acad of Sciences Shenyang China

The mechanical properties and deformation mechanisms of unidirectional carbon fiber reinforced magnesium composites under tensile loading are studied. Two different materials are used as fiber coatings: a single silica and a gradient C/SiC/SiO[sb 2]. The results show that, under the same preparation conditions, composite with the former coating is broken in a non-cumulative mode and its failure stress is rather low. Conversely, the latter coating demonstrates much better efficiency and the corresponding composite is broken in a cumulative mode.

关键词： Metallic matrix.composites Carbon fibers Tensile strength Elastic moduli Coatings Silica Deformation Crack propagation Crack initiation Fracture Stresses Strain

Nodulation and molecular characterization of pure culturesisolated from root nodules of Coriaria nepalensis

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第8期43卷 695-698页

作者： Chuanjiong Hu Pingzhen zhou Qi zhou Huakui Chen A. D. l. Akkermans Huazhong Agr Univ Coll Life Sci & Technol Wuhan 430062 Peoples R China Chinese Acad Agr Sci Inst Oil Crops Wuhan 430062 Peoples R China Agr Univ Wageningen Dept Microbiol NL-6703 CT Wageningen Netherlands

Four strains with typical morphology of actinomycete genus of Frankia were isolated from root nodules of Coriaria nepalensis. They were shown to nodulate the seedlings of host plant and hybridize with Frankia 16S rRNA targeted oligonucleotide probes, indicating that they did belong to the genus Frankia. Furthermore, by nifHDK probe hybridizations, the homologous fragments of nifHDK genes were detected among the bacteria, and they were located in various sizes of restriction fragments of total DNA, showing diverse patterns of restriction fragment length polymorphisms of nifHDK gene (nifHDK_RFlPs). The PCR_based amplification and cloning of nifH gene throw light on the molecular phylogeny of Coriaria_infective Frankia.

关键词： Frankia Coriaria nepalensis nodulation molecular characterization.

Dr. Samuel J. Klempner: collaborations with Asian countries speed up gastric cancer research

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2019年第1期8卷 82-83页

作者： Brad li Silvia l.zhou

Ex.ert's introduction Samuel ***,MD,currently serves as the Director of GI Oncology and Precision Medicine at The Angeles Clinic and Research Institute,Samuel Oschin Comprehensive Cancer Institute,Cedars-Sinai Medical Center in the United States(Figure 1).He is a clinical and translational researcher focusing on ex.erimental therapeutics in solid tumors,particularly upper gastrointestinal malignancies.

关键词： Cancer gastric Medicine

Spray granulation of Fe and C nanoparticles and their impedance match for microwave absorption

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第3期34卷 496-502页

作者： H.Huang Y.Gao C.F.Fang A.M.Wu x.l.Dong B.S.Kim J.H.Byun G.F.Zhang D.Y.zhou Key laboratory of Materials Modification by laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Composites Research Division Korea Institute of Materials Science797 Changwon-daeroSeongsan-guChangwonGyeongnam642-831Republic of Korea

The microwave absorbents of Fe and C nanoparticles as magnetic loss and dielectric loss material respectively were composited with the polyvinyl alcohol （PVA） as binder by spray granulation method, The electromagnetic parameters of Fe and C composite particles were analyzed by vector network. The complex.permittivity and magnetic permeability of Fe and C composite particles matched well with increasing C nanoparticle content, and then the microwave loss property was improved. A minimum reflection loss （Rl） of -42.7 dB at 3.68 GHz for a composite with 4.6 mm in thickness can be obtained when the content ratio of the C nanoparticles, the modified Fe nanoparticles and the PVA is 21：49：30 （Sample 3）.

关键词： Dielectric loss Magnetic loss Spray granulation method Impedance match

x.RAY STRUCTURE DETERMINATION OF SUBTIlISIN E AT 2 RESOlUTION

在线全文

学校读者我要写书评

暂无评论

X-RAY STRUCTURE DETERMINATION OF SUBTILISIN E AT 2 RESOLUT...

Optimization of Adaptive Transit Signal Priority Using Parallel Genetic Algorithm

Six.eenth Congress of the International Union of Crystallography

作者： N.-M.Chu K.Shi l.zhou R.-C.Bi l.Deng B.li Institute of Biophysics Academia Sinica

Subtilisin E from B,subtilis was produced by genetic engineering in Department of Biology,University of Science and Technology,Hefei,China,It has been crystallized in space group P222 with cell dimensions a=74.35A,,b=80.98A, and c=88.5 *** crystals contain two molecules of subtilisin E in an asymmetric unit,and this is a rare case among the subtilisin crystal structures studied so ***

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2007年第2期12卷 131-140页

作者： Guangwei zhou Albert Gan l. David Shen HDR Engineering Inc. Tampa Florida 33607 USA lehman Center for Transportation Research Florida International University Miami Florida 33174 USA College of Engineering and Computing Florida International University Miami Florida 33174 USA

Optimization of adaptive traffic signal timing is one of the most complex.problems in traffic control systems. This paper presents an adaptive transit signal priority （TSP） strategy that applies the parallel genetic algorithm （PGA） to optimize adaptive traffic signal control in the presence of TSP. The method can optimize the phase plan, cycle length, and green splits at isolated intersections with consideration for the performance of both the transit and the general vehicles. A VISSIM （VISual SIMulation） simulation testbed was developed to evaluate the performance of the proposed PGA-based adaptive traffic signal control with TSP. The simulation results show that the PGA-based optimizer for adaptive TSP outperformed the fully actuated NEMA control in all test cases. The results also show that the PGA-based optimizer can produce TSP timing plans that benefit the transit vehicles while minimizing the impact of TSP on the general vehicles.

关键词： adaptive traffic signal control transit signal priority parallel genetic algorithm traffic simulation traffic delay

DMMF: Dominant and Max.Min Fair Allocation in Satellite Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2015年第S2期12卷 149-154页

作者： lIN Fuhong ZHENG Yi zhou x.anwei lü x.ng School of Computer and Communication Engineering University of Science and Technology Beijing Network Technology Research Institute China United Network Communications Corporation Limited School of Science Beijing Jiaotong University

Resource allocation is crucial for satellite networks. In this paper, we propose a multi-resource fair allocation scheme, namely Dominant and Max.min Fair(DMMF), to efficiently and fairly allocate resources. It consists of two allocation stages, dominant resource fair(DRF) allocation stage and max.min fairness(MMF) allocation stage. The proposed DMMF scheme ex.ibits desirable properties, including share incentive, strategy proofness, envy freeness and Pareto optimality. Meanwhile, DMMF can improve the allocation efficiency and reach 100% allocation efficiency.

关键词： dominant resource fair(DRF) max.min fair(MMF) network efficiency satellite network