Materials Literature
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BACKGROUND: Valve replacement is the primary surgical treatment for heart valve disease. However, the clinical benefit of biological valve substitutes is limited by their potential immunogenicity. AIM: To seek a better method of preparing biological scaffolds for tissue engineering heart valves, we compared the abilit…
Interest in coated microbubbles as agents for therapeutic and quantitative imaging applications in biomedical ultrasound has increased the need for their accurate theoretical characterization. Effects such as gas diffusion, variation in the properties of the coating and the resulting changes in bubble behavior under r…
We discuss the long-wave hydrodynamic model for a thin film of nematic liquid crystal in the limit of strong anchoring at the free surface and at the substrate. We rigorously clarify how the elastic energy enters the evolution equation for the film thickness in order to provide a solid basis for further investigation:…
Abstract Martensitic steels are produced by quenching carbon steel from the austenite phase into martensite. This chapter provides information on the composition, microstructures, processing, deformation mechanisms, mechanical properties, hot forming, tempering, and special attributes of martensitic steels.
Abstract This chapter provides an overview of the composition, microstructures, processing, deformation mechanism, mechanical properties, formability, and special attributes of complex-phase steels.
The electronic band structure, density of states, structural phase transition and super conducting transition temperature of group –IV B element Zirconium (Zr) under normal and high pressure are reported. The normal pressure band structure, density of states and superconducting transition temperature of hcp - Zr agree…
Chitosan (CS) and gelatin (G) both have good biocompatibility and biodegradation, qualifying them for use in tissue engineering. In this study, CS and G are blended with different ratios to make the mixture solution, and then freeze-dried to form three-dimensional porous CS/G bone scaffolds. The surface, cross-section…
The oxidation of melted copper with air oxygen is considered from a viewpoint of the electrochemical theory of interactions at the melt-oxygen-containing gas interface. The calculations using the experimental data show that the process proceeds in a kinetic regime. The rate-determining step is the detachment of the fi…
Weave density , yarn size , texture cycle , and so on how to affect honeycomb weaves property and principle are analyzed , with weaving honeycomb textile based on Love structure model of non-plain weave fabric , different density , different organization cycle , different yarn count and different tension . Analysis re…
Various manganese oxide nanorods with similar one-dimensional morphology were prepared by calcination of MnOOH nanorods under different gas atmosphere and at different temperatures, which were synthesized by a hydrothermal route. The morphology and structure of MnOx catalysts were characterized by a series of techniqu…
The UK's National Physical Laboratory (NPL) has developed a range of advanced in situ diagnostic techniques to support research into mitigation strategies for critical PEM fuel cell (PEMFC) degradation mechanisms. Recent innovations include a new reference electrode configuration that for the first time allows mapping…
Abstract Austenitization refers to heating into the austenite phase field, during which the austenite structure is formed. This article highlights the purpose of austenitization, and reviews the mechanism and importance of thermodynamics and kinetics of austenite structure using an iron-carbon binary phase diagram. It…
A Passat diesel car is fuelled with 0%, 10%, 20% coal-to-liquid fuel and diesel blends. The emission characteristics of each fuel on NEDC test cycle are studied by Engine Exhaust Particle Sizer(EEPS) and running drum tester. The result shows that, when blended with coal-to-liquid fuel, the peak of particle number conc…
그린란드 남서부 티키우사크(Tikiusaaq) 카보나타이트 복합체와 케쿼르삭(Qaqarssuk) 카보나타이트 복합체가 산출되는 지역을 2주간 야외조사 한 결과와 대표적인 시료에 대한 암석기재학적 관찰을 통해 얻은 결과에 대해 보고하고자 한다. 터키우사크 카보나타이트 복합체내의 방해석 카보나타이트는 희토류원소를 다량 포함하는 스트론티아나이트와 앤시라이트 탄산염광물을 배태한다. 주사전자현미경에 부착된 X-선 분광 분석결과스트론티아나이트에서는 세륨이, 앤시라이트에서는 란탄, 세륨, 네오디뮴이 상당량 검출되었다. 퀘커르삭 카보나타이트에서는 희토류탄산염 광물 대신 바륨을 함…
Although installing offshore pipelines by reel-laying method is eases and cost-effective, still conceal some of plastic deformation into the pipeline which may, in combination with ageing, affect strength and ductility of the pipe material. Therefore, reeling pipelines that internally pressurized is addressed in this…
Abstract This article commences with a description of the principles of induction heating followed by a discussion on the high temperature electrical, magnetic, and thermal properties of steel, which influence the performance of induction heaters. The importance of eddy current distribution in a workpiece is explained…
The energy band structures of AnSn 3 (An=Th, U, Np, and Pu) are investigated by using a relativistic linear augmented plane wave method with the exchange-correlation potential in the local density approximation. The energy bands near the Fermi level are mainly caused by the hybridization between the 5 f and Sn 5 p ele…
Abstract Because of the exponential increase of computational resource requirement for numerical field simulations of more and more complex physical phenomena and more and more complex large problems in science and engineering practice, parallel processing appears to be an essential tool to handle the resulting large-…
This paper proposes a novel analytical model of air-gap eccentricity in induction motors (IMs) by allowing teeth saturation due to the local air-gap over-fluxing to be taken into account. The approach takes into account the magnetic saturation by means of a fictive permeance variation while supposing that, under air-g…
After reviewing some theoretical facts and early theories, this work presents a study of the dielectric properties of carbon black (Raven 7000) dispersions in an insulating epoxy matrix (diglycidylic ether of bisphe-nol F) in the frequency range 1kHz to 15MHz. In an earlier study,[ 1 El Bouazzaoui , S. ; Achour , M. E…