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

铸造厂技改的最新成果

中国铸造装备与技术 1988年第6期 51-54页

作者： w.d.Huskonen 王光阀

一、概况美国尼纳铸造公司为了提高在世界市场上的竞争能力,经过深入分析研究,决定投资三千多万美元,用三年多时间,先后把所属第二和第三铸造厂改造成具备柔性铸造系统的中小铸件厂。所谓柔性铸造系统,即在工艺技术先进、自动化程度高... 详细信息

一、概况美国尼纳铸造公司为了提高在世界市场上的竞争能力,经过深入分析研究,决定投资三千多万美元,用三年多时间,先后把所属第二和第三铸造厂改造成具备柔性铸造系统的中小铸件厂。所谓柔性铸造系统,即在工艺技术先进、自动化程度高的情况下可进行多品种小批量生产,既提高了铸件质量,也提高了铸件生产应变能力,可以适应目前工业生产产品多变、竞争激烈的新形势。

关键词：铸造厂铸造系统加工厂造型机铸件质量冲天炉化铁炉铁口铁水熔融金属抛丸清理混砂机砂处理设备球墨铸铁件给料器新砂原砂

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

RwEQ:改进后的风蚀预测模型(Ⅱ)

水土保持应用技术 2001年第2期19卷 22-23页

作者： d.w.Fryear J.d.Bilbro 高丽美国农业部山东农业大学资源与环境学院

目前已形成一种先进的风蚀模型 ,并且通过 45个多点多年田间试验的风蚀数据得到验证。在RwEQ中 ,把残茬、土壤可蚀性和土壤糙度参数看作是系数。在RwEQ计算程序中 ,表面残茬由于气候条件适宜而腐解 ,通过耕作措施将残茬掩埋或整平。土... 详细信息

目前已形成一种先进的风蚀模型 ,并且通过 45个多点多年田间试验的风蚀数据得到验证。在RwEQ中 ,把残茬、土壤可蚀性和土壤糙度参数看作是系数。在RwEQ计算程序中 ,表面残茬由于气候条件适宜而腐解 ,通过耕作措施将残茬掩埋或整平。土壤糙度根据耕作工具的不同而变化 ,并随着降雨量、灌溉量以及暴风雨侵蚀力的增大而衰减。用一个光学密度指数来描述风障的作用。斜坡上的风速是变化的 ,在土壤流失量的估计中考虑到了这个因素。土壤流失数据是从年平均降雨量在 191～ 12 5 5mm范围内的试验点上收集的 ,土壤沙粒含量浮动在10 %～ 87% ,大部分的风蚀数据来自 2 6hm2 的圆形地块 ,也有一部分来自面积较大的 5 2hm2 圆形地块和 36～ 12 8hm2 矩形地块。实际测出的土壤流失量在 0～ 31 2 1kg/m2 之间 ,而用RwEQ估计出的同一地块流失量为 0～ 39 15kg/m2 ,对估计和实测的数据进行统计分析 ,两者相关性显著。目前RwEQ技术已在一系列的土壤、气候、作物条件下得到验证 ,尚需在非矿质土壤上做进一步研究。

关键词：风蚀牛顿第一运动定律影响因子验证相关性美国

C_(2) SwAN BANd EMISSION BY MULTIPHOTON PHOTOdISSOCIATION OF C_(4)H_(2)N_(2) MOLECULE AT 193nm

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1987年第8期4卷 345-348页

作者： XIE Xiaoxiang J.B.Halpern w.M.Jackson Anhui Institute of Optics and Fine Mechanics Chinese Academy of SciencesHefei department of Chemistry Howard UniversityWashingtonDC20059USA department of Chemistry University of CaliforniaDavisCA 95616USA

Multiphoton dissociation of C_(4)H_(2)N_(2) molecules at 193nm has been studied at high laser *** spectra are recorded from violet(B ^(2)Σ→X ^(2)Σ)bands of CN and the Swan bands of C_(2)(d ^(3)π_(g) a ^(3)π_(u)).

关键词： bands violet dissociation

Metal foam and fin implementation into a triple concentric tube heat exchanger over melting evolution

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

Theoretical & Applied Mechanics Letters 2022年第2期12卷 118-126页

作者： M.A.Erfani Moghaddam M.R.Hassani Soukht Abandani Kh.Hosseinzadeh Mohammad Behshad Shafii d.d.Ganji department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran department of Mechanical Engineering Sharif University of TechnologyTehranIran

It is believed that it is going to be a sizeable mismatch between supply and demand when it comes to renewable ***,researchers are on course to compensate for the unpredictabilityof such resources by the employment of phase change materials(PCMs).Having multiple advantages,PCMs generally suffer from inadequate thermal conductivity which causes prolonged transition *** tackle this issue,this study is fixated on two parameterswhich are linked to fins addition and porous media incorporation in a melting process within a triple concentric tube heat exchanger(TCTHX).The results provided by multiple cases underlined the significance of natural convection in the bare system,although finned and copper-metal-foam cases outshine buoyancy forces by roughly 45%and 97%,*** is a major determent when it comes to the selection of porous media as Al_(2)O_(3) registered the weakest performance among SiC,Ni and Cu,however,it managed to speed up the process by 75%which still is much higher than the finned system,implying that porous media is of higher priority over *** best scenario transpiredwhile fins and copper metal foam were integrated as 26%and 97%soars in efficacy have been obtained compared to individual incorporation of porous media and fins,respectively.

关键词： Thermal storage TCTHX Fins Melting evolution Porous media Heat exchanger

EXISTENCE OF AREA MINIMIZING TANGENT CONES OF INTEGRAL CURRENTS wITH PRESCRIBEd MEAN CURVATURE

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 1995年第1期15卷 95-102页

作者： Frank duzaar(Institut fur Augewandte Mathematik der Universitat Bonn,Beringstr.4.d-53115 Bonn)Martin Fuchs(Universitat des Saarlandes,Fachbereich Mathematik,d-66123 Saarbrucken) Institut für Angewandte Mathematik der Universität Bonn Beringstr. 4 D–53115 Bonn Universität des Saarlandes Fachbereich Mathematik D–66123 Saarbrücken

Given an integral M-currrent To in Rm+k and a tensor H of type(m.l)on Rn+k with values orthogonal to each of its arguments we proved in a previous peper[3]the sxistence of anintegral m-current T =γ(M,θ.ζ)with boundary T0 and mean curvature vector H by minimizing an appropriate functional on suitable subclasses of the set of all integral *** thes paperwe discuss the existence and structure of oriented tangent cones C of T at points x∈spt(T) spt(T),especially we show that C is locally mass minimizing.

关键词： integral currents,generalized mean curvature tangent cones

多对比、各向同性、单层块3d-MRI在多发性硬化中的应用

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2008年第A6期31卷 526-527页

作者： B.Moraal S.d.Roosendaal P.J.w.Pouwels H.Vrenken R.A.van Schijndel d.S.Meier 林笑丰 department of Radiology MS Center Amsterdam VU University Medical Center Amsterdam The Netherlands.

本研究描述了各向同性、单层块三维数据集组[双反转恢复序列(double inversion-recovery,dIR)、液体衰减反转恢复序列(fluid-attenuated

关键词：双反转恢复液体衰减反转恢复脑皮层幕下流动伪影

Producing Pesta,a delivery system for biocontrol agents,by twin-screw extrusion

在线全文

学校读者我要写书评

暂无评论

Producing Pesta,a delivery system for biocontrol agents,by t...

International Conference:Technology Transfer in Biological Control:From Research to Practice

作者： d.J.dAIGLE w.J.CONNICK M.LOVISA K.wILLIAMS C.d.BOYETTE M.wATSON USdA ARSSRRCP.O.Box 19687New OrleansLA 70179USA

"Pesta" granules in which fungal propagules are encapsulated in a wheat gluten matrix were prepared in pound quantities by twin-screw extrusion. The *** these granules were compared to the *** laboratory *** the dough formulation of wheat flour,clay filler,fungus,and water,low water concentration reduced the viability of Colletotrichum

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

矿产勘探中的水化学方法

国外地质勘探技术 1985年第4期 39-40页

作者： d.d.Runnells P.w.Lahermo 余慧

大约有25到30人参加了水地球化学找矿的专题讨论。正式会议中有八篇报告。包括:综述两篇,例案三篇,水的专属性和运移报告两篇,统计解释方法一篇。

关键词：地球化学方法专题讨论探途元素水地球化学

Stepwise 3d-spatio-temporal magnesium cationic niche: Nanocomposite scaffold mediated microenvironment for modulating intramembranous ossification

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2021年第2期6卷 503-519页

作者： Jie Shen Bo Chen Xinyun Zhai wei Qiao Shuilin wu Xuanyong Liu Ying Zhao Changshun Ruan Haobo Pan Paul K.Chu Kenneth M.C.Cheung Kelvin w.K.Yeung department of Orthopaedics and Traumatology The University of Hong KongHong KongChina Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma Department of Orthopaedics and Traumatologythe University of Hong Kong-Shenzhen HospitalShenzhenChina Shanghai Institute of Traumatology and Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint DiseasesRuijin HospitalSchool of MedicineShanghai Jiaotong UniversityShanghaiChina School of Materials Science and Engineering Nankai UniversityTianjinChina School of Materials Science&Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjinChina Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhanChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina Cixi Center of Biomaterials Surface Engineering Shanghai Institute of CeramicsChinese Academy of SciencesNingboChina Center for Human Tissues and Organs degeneration Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhenChina department of Physics Department of Materials Science&Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong KongChina

The fate of cells and subsequent bone regeneration is highly correlated with temporospatial coordination of chemical,biological,or physical cues within a local tissue *** understanding of how mammalian cells react to local tissue microenvironment is paramount important when designing next generation of biomaterials for tissue *** study aims to investigate that the regulation of magnesium cationic(Mg^2+)tissue microenvironment is able to convince early-stage bone regeneration and its mechanism undergoes intramembranous *** was discovered that moderate Mg^2+content niche(~4.11 mM)led to superior bone regeneration,while Mg^2+-free and strong Mg^2+content(~16.44 mM)discouraged cell adhesion,proliferation and osteogenic differentiation,thereby bone formation was rarely *** magnesium ions diffused into free Mg zone from concentrated zone in late time point,new bone formation on free Mg zone became significant through intramembranous *** study successfully demonstrates that magnesium cationic microenvironment serves as an effective biochemical cue and is able to modulate the process of bony tissue *** knowledge of how a Mg^2+cationic microenvironment intertwines with cells and subsequent bone formation gained from this study may provide a new insight to develop the next generation of tissuerepairing biomaterials.

关键词： Nanocomposite Magnesium ion Microenvironment 3d scaffold Bone tissue regeneration