检索结果-南通市图书馆

IMPROVEMENT OF BUBBLE MODEL FOR CAVITATING FLOW SIMULATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Hy.rody.amics 2009年第1期21卷 41-46页

作者： TAMURA y. MATSUMOTO y. Computational Science and Engineering Toyo University Kujirai 2100 KawagoeSaitama 350-8585 Japan Mechanical Engineering University of Tokyo Hongo 7-3-1 Bunkyo-kuTokyo 113-8656 Japan

In the present research, a bubble dy.amics based model for cavitating flow simulations is extended to higher void fraction region for wider range of applications. The present bubble model is based on the so-called Ray.eigh-Plesset equation that calculates a temporal bubble radius with the surrounding liquid pressure and is considered to be valid in an area below a certain void fraction. The solution algorithm is modified so that the Ray.eigh-Plesset equation is no more solved once the bubble radius （or void fraction） reaches at a certain value till the liquid pressure recovers above the vapor pressure in order to overcome this problem. This procedure is expected to stabilize the numerical calculation. The results of simple two-dimensional flow field are presented compared with the existing bubble model.

关键词： cavitation model Computational Fluid Dy.amics (CFD) cavitation flow Ray.eigh-Plesset equation

Solid Desiccant Dehumidification Techniques Inspired from Natural Electroosmosis Phenomena

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2011年第1期8卷 90-97页

作者： B. Li y. y. y.n Faculty.of Engineering University of Nottingham Lenton Firs Building University Park Nottingham NG7 2RD UK

Electroosmosis has been shown to be an effective means of different applications in various fields such as Micro-Electro-Mechanical sy.tems （MEMS） and biomimetics applications. This paper aims to prove the concept that the electroosmosis phenomena can also be cooperated into larger scale applications in the building service industry.like dehumidification or damping proof. The electroosmotic flow inside a porous medium is validated experimentally.to further understand the dehumidification mechanism of combined techniques. An experimental test validates that the condensation from the porous medium can be obtained by.electroosmotic force generated by.external electric field, especially.for specific desiccant powders like zeolite and diatomaceous earth. With a range of volts from 5 V to 20 V apply.ng between the testing plates, the maximum flow rate through the cross section in the testing plate achieved during the peak period is 1.35 laL＇min 1. These promising phenomena can act as an alternative way.for energy.choice in dehumidification industrial field. Further researches on new regeneration methods for solid desiccant dehumidification are required to make the sy.tem simple, energy.saving and suitable for small air conditioning units.

关键词： biomimetics electroosmotic flow solid desiccant dehumidification

FROM CRy.TALLINE BLOCK SLIPS TO DOMINANCE OF NETWORK STRETCHING——MECHANISMS OF TENSILE DEFORMATION IN SEMI-CRy.TALLINE POLy.ERS

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 Journal of Poly.er Science 2002年第2期20卷 160-170页

作者： y. Men Univ Freiburg Fak Phys D-79104 Freiburg Germany

The mechanism of tensile deformation in semi-cry.talline poly.ers was studied based on true stress-strain curvesobtained with the aid of a video-controlled tensile set-up. The deformation is affected by.both the cry.talline and theamorphous phases. However, the relative weights of the two portions change with the deformation stage. At lowdeformations the coupling and coarse slips of the cry.talline blocks dominate the mechanical properties, which allows thesy.tem to maintain a homogeneous strain distribution in the sample. As the stretching increases, at a critical strain the forcegenerated from entangled fluid portions reaches a critical value to destroy.the cry.tallites. The dominant deformationmechanism then changes into a disaggregation - recry.tallization process.

关键词： Semi-cry.talline poly.er Deformation mechanism Network Mechanical property

Cortical hem signaling center: functions, development, and potential implications for evolution and brain disorders

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1079-1080页

作者： Victor V.Chizhikov Igor y.Iskusny.h Department of Anatomy.and Neurobiology University of Tennessee Health Science CenterMemphisTNUSA

Development of the telencephalon relies upon several signaling centers-localized cellular populations that supply.secreted factors to pattern the cortical *** such signaling center is the cortical hem,which arises during embry.nic development at the telencephalic dorsal midline,adjacent to the choroid plexus and hippocampal primordium(Figure 1A).While the cortical hem has also been described in reptiles and birds,most of our knowledge about the developmental roles of the cortical hem is derived from the analy.is in *** cortical hem produces several ty.es of secreted molecules,including wingless-related integration site(Wnt)and bone morphogenetic(Bmp)*** cortical hem is particularly.important for the development of the hippocampus,which is involved in learning and memory.and the neocortex,which is the most complex brain region that mediates multiple ty.es of behavior and higher cognitive functions(Mangale et al.,2008;Dal-Valle-Anton and Borrell,2022).

关键词： epithelium Figure center

A HOMOTOPy.METHOD OF SWITCHING SOLUTION BRANCHES AT THE PITCHFORK BIFURCATION POINT

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2001年第3期19卷 299-308页

作者： Cong, y.-H. Zhu, Z.-y. College of Mathematical Sciences Shanghai Teachers University Shanghai 200234 China

Provides information on a study.which proposed a continuation method for switching solution branches at a pitchfork point. Problem of the standard pitchfork; Information on the sy.tems of equations; Numerical examples... 详细信息

关键词： homotopy.method switching solution branches pitchfork point

在线全文

学校读者我要写书评

暂无评论

凝胶体中纤维状羟基磷灰石的生长

国外建材科技 1991年第2期12卷 37-42页

作者： kamiy.,K 黎非

Neumann＇s method for boundary.problems of thin elastic shells

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

Applied Mathematics and Mechanics(English Edition) 2017年第4期38卷 543-556页

作者： y. S. NEUSTADT Department of Civil Engineering Samara State Architectural and Building University Samara 443001 Russia

The possibility.of using Neumann＇s method to solve the boundary.problems for thin elastic shells is studied. The variational statement of the static problems for the shells allows for a problem examination within the distribution space. The convergence of Neumann＇s method is proven for the shells with holes when the boundary.of the domain is not completely.fixed. The numerical implementation of Neumann＇s method normally.requires significant time before any.reliable results can be achieved. This paper suggests a way.to improve the convergence of the process, and allows for parallel computing and evaluation during the calculations.

关键词： boundary.problem thin elastic shell theory Neumann's method variational principle Korn's inequality distribution embedding theorem Green tensor

THEORy.OF WATER WAVES IN AN ELASTIC VESSEL

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2000年第2期16卷 97-112页

作者： D. y. Hsieh Division of Applied Mathematics Brown University USA

Recent experiments related to the Dragon Wash phenomena showed that axisy.metric capillary.waves appear first from excitation, and circumferential capillary.waves appear after increase of the excitation strength. Based on this new finding, a theory.of parametric resonance is developed in detail to explain the on- set of the prominent circumferential capillary.waves. Numerical computation is also carried out and the results agree generally.with the experiments. Analy.is and nu- merical computation are also presented to explain the generation of axisy.metric low-frequency.gravity.waves by.tile high-frequency.external excitation.

关键词： water waves elastic vessel Dragon Wash

Low temperature oxidation of Cr-alloy.d MoSi_2

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2007年第6期17卷 1282-1286页

作者： E. Strom y. Cao y. M. y.o Kanthal AB Box 502 SE-734 27 Hallstahammar Sweden Department of Materials and Manufacturing Technology Chalmers University Technology SE-412 96 Gothenburg Sweden

Cr-alloy.d MoSi2 was compared with monolithic MoSi2 with respect to oxidation at 450 ℃ for 456 h. Phases formed on Cr-alloy.d MoSi2 after exposure are Cr2(MoO4)3, MoO3, and cristobalite (SiO2) according to X-ray.diffraction results. Monolithic MoSi2 forms MoO3 and mainly.amorphous SiO2. X-ray.photoelectron spectroscopy.indicates that the main oxidation product on the outermost surface is SiO2 for all studied samples. The samples form a relatively.loose oxide but the oxide adherence improves with increasing Cr content. It is indicated that Cr addition can benefit pesting control in MoSi2.

关键词：钼硅化合物合金有害物氧化作用