Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The TiB2-Al2O3 porous composites were obtained in situ by self-propagating high temperature synthesis (SHS) of TiO2-B2O3-Al System. The reaction was carried out in a SHS reactor under static argon gas at the pressure of 0.5 MPa. The standard Gibbs energy minimization method was used to calculate the equilibrium compos…
This paper presents the structural, ferroelectric, ferromagnetic, resonance and magnetoelectric (ME) properties of multilayered ME composites fabricated using molten-salt synthesis method. The compositions corresponding to CoFe2O4 (CFO) with particle size of ~ 150 nm and Ba0.8Sr0.2TiO3 (BST) with particle size of ~ 10…
Blended elemental powders with the nominal compositions (at%) of Ti50Al50, was mechanically alloyed in a planetary ball milling system for up to 100h, an amorphous Ti50Al50 phase was obtained in the process. The amorphization process as a function of time of milling was monitored by scanning electron microscope, X-ray…
기존의 반사형 타원계에 광분할기와 프리즘 등의 광학소자를 추가하여 8.0 ㎛ 보다 작은 면적에서 시료의 광학이방성을 측정할 수 있는 수직반사형 타원계를 제작하였다. 수직반사 구조를 구현하기 위해 사용된 광학소자들의 편광작용을 보정하여 광학이방성 측정의 정확도를 향상시켰다. 비편광 광분할기를 사용하고 사분파장 위상지연자를 장착하며 광섬유를 제거하고 파장영역을 최적화하여 광학이방성인자 측정값의 표준편차를 0.00083 으로 줄이고 방위각 변화에 따른 rutile 시료의 광학이방성인자의 변동폭을 0.015 이하로 줄일 수 있었다.
degassing, crystallization of thin-films, tempering, forming, and precompaction. Estimation of the characteristics of transient heating stages and thermal non-uniformities on a single glass substrate or in a stack of glasses are extremely helpful to understand non-homogeneity of mechanical and electronic features of n…
A series of bulk polycrystalline samples of La0.6Sr0.15Na0.10.15MnO3( represents vacancy)with Ag addition were prepared by conventional Sol-gel reaction processing in air.The mol proportion between La0.6Sr0.15Na0.10.15MnO3 and Ag is 1:x (x=0.00,0.016,0.04,0.1). This article focuses on the impact of Ag doping on the…
Pr0.5Ca0.5Mn0.99Al0.01O3 compound was prepared by standard solid state reaction to study its ac susceptibility at low temperatures. The X-ray powder diffraction patterns show that the compound is single-phase orthorhombic structure. The cusps of charge ordering and the long range AFM order of the “pseudo”-CE type are…
La0.6Sr0.4Co0.2Fe0.8O3-δ composite oxide was prepared and characterized. Dilatometer and four-probe DC were exploited to investigate the thermal expansion and electrical conductivity, respectively. The thermal expansion curve was linear, but it became steeper at the high temperature region, as a result of the loss of…
Abstract We introduce a new approach to calculate directly the electric current in Born–Oppenheimer molecular dynamics. In this approach the electric current is computed from the adiabatic variations of the Kohn–Sham eigenstates between consecutive time steps. This conceptually straightforward method is fairly efficie…
Molecular dynamics simulations were performed to study the interaction between atomic hydrogen and silicon carbide. In the present study, we focus on the effect of the surface temperature on H interacting with silicon carbide. The simulation results show that the retention of H atoms in the sample decreases linearly w…
Abstract : Two sample reels of Niedner Rifts Fuel Hoses were tested for resistance to ballistic penetration from hand-held or shoulder fired weapons. These hose samples had been tested for fuel supply testing several years ago. The question to be answered was, has several years storage after exposed to fuel affect the…
Η αντίδραση ολεφινικής μετάθεσης επάγει την ήπια σχάση και επανασχηματισμό των διπλών δεσμών άνθρακα-άνθρακα ενώ, από την ανακάλυψή της, έχει βρει εφαρμογές στην οργανική σύνθεση (βασικές χημικές ουσίες, φαρμακευτικά προϊόντα). Η αντίδραση καταλύεται από πληθώρα συστημάτων, τα οποία βασίζονται κυρίως σε μονοπυρηνικά σ…
This paper presents a simple and practical method which enables to prevent malfunction of protection relay due to differential current caused by one end CT saturation in case of external fault. This method uses difference of magnitude(instantaneous value) between the both end current just before the occurrence of diff…
The thermal rate constant of the O([superscript 3]P) + CH[subscript 4] → OH + CH[subscript 3] reaction is investigated with ring polymer molecular dynamics on a full-dimensional potential energy surface. Good agreement with experimental and full-dimensional quantum multiconfiguration time-dependent Hartree results bet…
本研究主要探討9Cr-1Mo鍋爐用鋼（T91）在650～850℃熱循環條件下的高溫氧化行為。研究結果顯示，T91的氧化速率隨著溫度增加而增加。T91在循環氧化下形成的氧化物因溫度高低而有所不同，在650℃時，表面生成具有保護性的(Fe,Cr)2O3與(Fe,Cr)3O4，而在750℃氧化時，氧化物主要為外層的Fe2O3與Fe3O4以及內層的(Fe,Cl)3O4，當850℃氧化時，氧化層有垂直的裂縫產生，主要為Fe2O3，以致使氧化速率加速。
The title of this final year project is “design and fabrication of jig for butt welding”. Jigs are special purpose tools which are used to facilitate production like machining, assembling and inspection operations. The purpose of this jig is to hold the specimen of the welding specimen which is the sheet metal. The fa…
In order to give a suitable heat treatment technique for as-extruded Mg-5Sn-2Si-2Sr alloy, the microstructure and mechanical properties of the as-extruded alloy after T4, T5, T6 heat treatment were investigated by means of hardness tester, the X-ray diffraction, the tensile tester and the optical microscopy. The resul…
Les maladies vasculaires, particulierement celles associees aux vaisseaux sanguins de petit diametre, sont la premiere cause de deces aux Etats-Unis. Les couts lies aux maladies cardiovasculaires ont augmente constamment avec le temps. Dans les dernieres annees, de nombreuses recherches en bio-ingenierie ont ete reali…
The world has faced with various environmental problems such as climatic change, global pollution, and depletion of natural resources. Conventional economic development continues not only to intensify the magnitude of the problems but also to damage growth potential of future generations. Therefore, recent manufacture…
A study on microstructure control of multi-phase steel have been implemented to higher strength with improved formability. However, it is well known that the high strength of steel are susceptible to hydrogen embrittlement. The mechanisms of hydrogen embrittlement is caused by complex interactions. In this paper, the…