检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

发动机分析设计方法述评

汽车与新动力 1996年第6期28卷 11-27页

作者： Gale N F Widener S k Sui P c 孙书麒

借助于计算机的分析设计方法正在对发动机的设计过程进行改革。各种分析工具已使设计优化更为快捷而精确。由于设计文件通过电子传递将使采用不同分析软件包或从事各种零件设计工作的工程师们可以平行地进行设计工作,从而也缩短了设计... 详细信息

借助于计算机的分析设计方法正在对发动机的设计过程进行改革。各种分析工具已使设计优化更为快捷而精确。由于设计文件通过电子传递将使采用不同分析软件包或从事各种零件设计工作的工程师们可以平行地进行设计工作,从而也缩短了设计过程。可以采用各种快速样品制作方法直接由计算机辅助设计(cAD)制造样品零件及加工工具。由于分析设计法还能使设计高度优化,从而使研制阶段所需进行修改的可能性减少。评述了这些新方法,并对如何利用它们提高设计技巧作了分析。讨论了下述一些设计方法:(1)发动机模拟程序;(2)充分利用当前cAD系统的各种方法;(3)快速样品制作;(4)有限元分析模型;(5)计算流体动力学;(6)摩擦与磨损分析;(7)零件可靠性分析;(8)轴承计算;(9)系统运动学与动力学分析模型。

关键词：柴油机设计 cAD 评述

A route for large-scale preparation of multifunctional superhydrophobic coating with electrochemically-modified kaolin for efficient corrosion protection of magnesium alloys

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 Magnesium and Alloys 2022年第11期10卷 3082-3099页

作者： Xiang Liu Tian c.Zhang Yuxin Zhang Jinsong Rao Shaojun Yuan Low-carbon Technology&chemical Reaction Engineering Lab College of Chemical EngineeringSichuan UniversityChengdu 610065China civil&Environmental Engineering Department University of Nebraska-LincolnOmahaNE 68182-0178USA State key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

Superhydrophobic coating has been widely studied for its great applicational potential, such as for corrosion protection of magnesium alloys while it has been restrained by expensive materials, sophisticated preparation process and infirm rough structures. In this study, the electrochemical method was adopted by using a two-electrode system for rapid hydrophobic modification to obtain superhydrophobic *** mixing the modified superhydrophobic kaolin with commercial epoxy resin and polydimethylsiloxane glue, a paint can be formed and easily used on various substrates for preparation of superhydrophobic coating via spraying method. The influence factors on wettability of the modified kaolin and the mixing ratio of each component of the coating were explored. Also, the wettability, durability and anticorrosion of the prepared coating were evaluated comprehensively. The coating was able to maintain superhydrophobic after immersed in Hcl solution at pH 1, the NaOH solution at pH 14, and 3.5 wt.% Nacl solution for 16, 21, 30 days, respectively. In addition, the coating exhibited 4A grade adhesion, high hydrophobicity after abraded for 200 cycles on a 600-mesh sandpaper with 100 g weight, and 99.86% anticorrosion efficiency after soaked in 3.5 wt.% Nacl solution for 20 days, demonstrating a good robustness and anti-corrosion property. Furthermore, the coating showed good transparency, flexibility and was easy to make in a large scale by the spraying method, which is of great significance to promote the practical application of superhydrophobic coatings and the anticorrosion Mg alloys.

关键词： Superhydrophobic coating Large-scale application Magnesium alloys corrosion protection

Spectroscopy of a Gamma Irradiated Poly(Acrylic Acid)-clotrimazole System

在线全文

学校读者我要写书评

暂无评论

chinese Physics Letters 2011年第12期28卷 274-277页

作者： M.Todica c.V.Pop Luciana Udrescu Traian Stefan Faculty of Physics Babes-Bolyai University400084 Cluj-NapocaRomania

A poly(acrylic acid)-clotrimazole system,gamma irradiated at different doses,is investigated by Raman *** of the spectrum of the polymeric matrix appear for doses of radiation greater than 333 Gy,whereas the spectrum of clotrimazole remains unaffected at these doses of *** changes correlate with modification of the vibration modes of cOOH and cH_(2) groups of a polymeric matrix after irradiation.

关键词： spectroscopy polymeric matrix

cO_2 adsorption using TiO_2 composite polymeric membranes:A kinetic study

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 Environmental Sciences 2015年第9期27卷 163-171页

作者： Sarah Hafeez X.Fan Arshad Hussain c.F.Martín School of chemical and Materials Engineering (ScME) National University of Sciences & Technology Institute for Materials and Processes School of Engineering University of Edinburgh University of Aberdeen School of Engineering Fraser Noble Building King's College

cO2is the main greenhouse gas which causes global climatic changes on larger scale. Many techniques have been utilised to capture cO2. Membrane gas separation is a fast growing cO2 capture technique, particularly gas separation by composite membranes. The separation of cO2 by a membrane is not just a process to physically sieve out of cO2 through the controlled membrane pore size. It mainly depends upon diffusion and solubility of gases, particularly for composite dense membranes. The blended components in composite membranes have a high capability to adsorb cO2. The adsorption kinetics of the gases may directly affect diffusion and solubility. In this study, we have investigated the adsorption behaviour of cO2 in pure and composite membranes to explore the complete understanding of diffusion and solubility of cO2 through membranes. Pure cellulose acetate（cA） and cellulose acetatetitania nanoparticle（cA-TiO2） composite membranes were fabricated and characterised using SEM and FTIR analysis. The results indicated that the blended cA-TiO2 membrane adsorbed more quantity of cO2 gas as compared to pure cA membrane. The high cO2 adsorption capacity may enhance the diffusion and solubility of cO2 in the cA-TiO2 composite membrane, which results in a better cO2 separation. The experimental data was modelled by Pseudo first-order, pseudo second order and intra particle diffusion *** to correlation factor R2, the Pseudo second order model was fitted well with experimental data. The intra particle diffusion model revealed that adsorption in dense membranes was not solely consisting of intra particle diffusion.

关键词： Global warming cellulose acetate Gas adsorption Pseudo order models cO2 Ti O2

Arabidopsis OBG-Like GTPase （AtOBGL）Is Localized in chloroplasts and Has an Essential Function in Embryo Development

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2009年第6期2卷 1373-1383页

作者： Fatima chigri claudia Sippel Manuela kolb Ute c. Vothknecht center for Integrated Protein Science (Munich) Department of Biology LMU Munich D-81377 Munich Germany Department of Biology I Botany LMU Munich D-82152 Planegg-Martinsried Germany

OBG-like GTPases, a subfamily of P-loop GTPases, have divers and important functions in bacteria, including initiation of sporulation, DNA replication, and protein translation. Homologs of the Bacillus subtilis spo0B GTP-binding protein （OBG） can be found in plants and algae but their specific function in these organisms has not yet been elucidated. Here, it is shown that ATSG18570 encodes an Arabidopsis thaliana OBG-like protein （AtOBGL） that is localized in chlor- oplasts. In contrast to the bacterial members of this protein family, AtOBGL and other OBG-like proteins from green algae and plants possess an additional N-terminal domain, indicating functional adaptation. Disruption of the gene locus of ATOBGL by TDNA insertion resulted in an embryo-lethal phenotype and light microscopy using Normarski optics revealed that embryo maturation in the atobgl mutant is arrested at the late globular stage before development of a green embryo. Expression of 35S：：ATOBGL within the atobgl mutant background could rescue the mutant phenotype, confirming that embryo-lethality is caused by the loss of AtOBGL. Together, the data show that the bacterial-derived OBG-like GTPases have retained an essential role in chloroplasts of plants and algae. They furthermore corroborate the significance of chloroplast functions for embryo development -- an important stage within the Arabidopsis lifecycle.

关键词： GTPase OBG embryo development chloroplast.

Nitrogen mass balance in a constructed wetland treating piggery wastewater effluent

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 Environmental Sciences 2014年第6期26卷 1260-1266页

作者： Soyoung Lee Marla c.Maniquiz-Redillas Jiyeon choi Lee-Hyung kim Water Environment Research Dept. National Institute of Environmental Research Hwangyeong-ro 42 Seo-gu Incheon 404-708 Korea Department of civil and Environmental Engineering Kongju National University 275 Budaedong Seobukgu Cheonan Chungnamdo 331-717Korea

The nitrogen changes and the nitrogen mass balance in a free water surface flow constructed wetland （cW） using the four-year monitoring data from 2008 to 2012 were estimated. The cW was composed of six cells in series that include the first settling basin （cell 1）, aeration pond （cell 2）, deep marsh （cell 3）, shallow marsh （cell 4）, deep marsh （cell 5） and final settling basin （cell 6）. Analysis revealed that the NH4＋-N concentration decreased because of ammonification which was then followed by nitrification. The NO4＋-N and NO4＋-N were also further reduced by means of microbial activities and plant uptake during photosynthesis. The average nitrogen concentration at the influent was 37,819 kg/year and approximately 45% of that amount exited the cW in the effluent. The denitrification amounted to 34% of the net nitrogen input, whereas the accretion of sediment was only 7%. The biomass uptake of plants was able to retain only 1% of total nitrogen load. In order to improve the nutrient removal by plant uptake, plant coverage in four cells （i.e., cells 1, 3, 4 and 5） could be increased.

关键词： constructed wetland livestock wastewater nitrogen mass balance plant uptake sediment

Important parameters in plasma jets for the production of RONS in liquids for plasma medicine: A brief review

在线全文

学校读者我要写书评

暂无评论

Frontiers of chemical Science and Engineering 2019年第2期13卷 238-252页

作者： Anna khlyustova cédric Labay Zdenko Machala Maria-Pau Ginebra cristina canal Biomaterials Biomechanics and Tissue Engineering GroupDepartment of Materials Science and MetallurgyUniversitat Politecnica de CatalunyaBarcelona 08019Spain Research centre in Multiscale Science and Engineering Universitat Politecnica de CatalunyaBarcelona 08019Spain Faculty of Mathematics Physics and InformaticsComenius UniversityBratislava 84248Slovakia

Reactive oxygen and nitrogen species (RONS) are among the key factors in plasma medicine. They are generated by atmospheric plasmas in biological fluids, living tissues and in a variety of liquids. This ability of plasmas to create a delicate mix of RONS in liquids has been used to design remote or indirect treatments for oncological therapy by treating biological fluids by plasmas and putting them in contact with the tumour;Documented effects include selective cancer cell toxicity, even though the exact mechanisms involved are still under investigation. However, the "right" dose for suitable therapeutical activity is crucial and still under debate. The wide variety of plasma sources hampers comparisons. This review focuses on atmospheric pressure plasma jets as the most studied plasma devices in plasma medicine and compiles the conditions employed to generate RONS in relevant liquids and the concentration ranges obtained. The concentrations of H2O2, NO2^-, NO3^- and short-lived oxygen species are compared critically to provide a useful overview for the reader.

关键词： atmospheric plasma jets liquids ROS RNS plasma-dose

Mutator for transferring a memristor emulator into meminductive and memcapacitive circuits

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

chinese Physics B 2014年第7期23卷 366-376页

作者：于东升梁燕 Herbert H.c.Iu 胡义华 School of Information and Electrical Engineering China University of Mining and Technology School of Electrical Electronic and Computer EngineeringThe University of Western Australia School of Electronic and Electrical Engineering University of Strathclyde

In this paper, a concise but effective interface circuit for transforming a memristor into meminductive and memcapac- itive systems is designed. This newly proposed interface circuit, constructed by only two current conveyors, is equipped with three available ports, which can provide six connecting combinations in terms of one resistor, one capacitor, and one memristor. For the sake of confirming the design effectiveness, theoretical and simulation discussions are hence introduced and all the experimental waveforms provide conclusive evidence to validate the correctness of these new mutators. The most attractive features of this new interface circuit are the floating terminals and convenient practical implementation.

关键词： memristor meminductive memcapacitive self-excited oscillator

Sensitivity of the Simulation of Tropical cyclone Size to Microphysics Schemes

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2016年第9期33卷 1024-1035页

作者： kelvin T.F.cHAN Johnny c.L.cHAN School of Energy and Environment City University of Hong Kong

The sensitivity of the simulation of tropical cyclone （Tc） size to microphysics schemes is studied using the Advanced Hurricane Weather Research and Forecasting Model （WRF）. Six Tcs during the 2013 western North Pacific typhoon season and three mainstream microphysics schemes-Ferrier （FER）, WRF Single-Moment 5-class （WSM5） and WRF Single-Moment 6-class （WSM6）-are investigated. The results consistently show that the simulated Tc track is not sensitive to the choice of microphysics scheme in the early simulation, especially in the open ocean. However, the sensitivity is much greater for Tc intensity and inner-core size. The Tc intensity and size simulated using the WSM5 and WSM6 schemes are respectively higher and larger than those using the FER scheme in general, which likely results from more diabatic heating being generated outside the eyewall in rainbands. More diabatic heating in rainbands gives higher inflow in the lower troposphere and higher outflow in the upper troposphere, with higher upward motion outside the eyewall. The lower-tropospheric inflow would transport absolute angular momentum inward to spin up tangential wind predominantly near the eyewall, leading to the increment in Tc intensity and size （the inner-core size, especially）. In addition, the inclusion of graupel microphysics processes （as in WSM6） may not have a significant impact on the simulation of Tc track, intensity and size.

关键词： tropical cyclone microphysics size intensity track numerical modelling