Materials Literature
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ジフェニルカーボネート (DPC) をモデル物質に用いてポリカーボネート (PC) の熱分解生成物の定量的解析を行った. 従来からPCの熱分解生成物の解析と分解経路については研究が行われているが, 一酸化炭素 (CO), 二酸化炭素 (CD) などの低沸点熱分解生成物については定量精度の問題などで明確ではなかった. しかし, COの生成は熱分解時の有毒ガス発生, CDの生成については燃焼性制御の場合の炭化層形成を考慮するのに重要な因子である. そこで本報では熱分解生成物の定量精度の向上と検定を目的として, DPCをモデル物質に用いて未分離ピークをマススペクトルで分離定量する方法と熱分解生成物の元素および構造比制約を考案し, それを…
We have investigated the low–energy electronic state of boron-doped diamond thin film by the laser–excited photoemission spectroscopy. A clear Fermi–edge is observed for samples doped above the semiconductor–metal boundary, together with the characteristic structures at 150 × n meV possibly due to the strong electron–…
The goal of this paper is to derive again the generalized Cahn-Hilliard andAllen-Cahn models in deformable continua introduced previously by E. Friedand M. E. Gurtin on the basis of a microforce balance. We use a~differentapproach based on the second law in the form of the entropy principleaccording to I. Müller and I…
Liquid processing to form fine polycarbosilane nanoparticles based on the supersaturation in mixed solvents was investigated, in order to synthesize fine precursor powders for silicon carbide. Polycarbosilane solids were dissolved in n-hexane, followed by two kinds of mixing methods with ethanol. By the method of grad…
Monte Carlo simulations were performed for hard spheres (HSs) under gravity. The gravity was increased stepwise. HSs were placed between the bottom and the top hard walls. For g*≥0.9, we observed that a ‘sediment’ was comprised of two crystalline and one fluid regions. Here, g*is defined by g*=mgσ/kBT with m being the…
Two-dimensional faceted dendrite growth of silicon from undercooled melt of Si–6 wt%Ni alloy was experimentally investigated, in which molten alloy film from 10 to 20 mm in thickness was undercooled up to 115 K and growing dendrites were observed in situ. Both the in situ observation of dendrite morphology and the EBS…
Chrome-free leather has gradually gained commercial importance, particularly for automobile upholstery applications. In many respects, however, chrome-free leather is inferior to chrome-tanned leather. UV and heat are known to be more detrimental to chrome-free leather than to chrome-tanned leather, especially in rega…
In this paper, we report on the oxidation behavior of Ti 3 GeC 2 and Ti 3 ͑Ge 0.5 ,Si 0.5 ͒C 2 .The oxidation kinetics were studied thermogravimetrically in air in the 700-1000°C temperature range.The oxidation layers formed on Ti 3 GeC 2 at 700°C were protective; at 800°C and higher, they were not.The addition of Si…
First-principle calculations based on the plane-wave pseudopotential method have been used to study the surface energy and structure of anatase TiO2(101) surface.There are six different structures of the anatase TiO2(101) crystal surface because different atoms are terminated on the surface layers. The calculation res…
Working in tight protective clothing made from coated fabrics, which are not permeable to water vapour, causes considerable discomfort, among other reasons because it is impossible to expel high quantities of intensively secreted sweat from the garment [1]. The sweat accumulates on the skin and on the internal surface…
The impact of surface finish on rotary beam fatigue life of 0.323 mm Nitinol (Ni 56wt%-Ti) wire is studied. In preparation of the wire samples, processing parameters such as cold work reduction and annealing were held constant for all surface conditions investigated. Various Niti wire surfaces such as light oxide, dar…
This project deals with the prediction of knitted fabric weight per unit area using appropriate software called proKNIT. This software has been designed according to the existing literature, and can determine the weight of knitted fabrics in different relaxing conditions by entering process and material variables, suc…
A CuO nanoflower film was fabricated on copper by controlled surface oxidation in KOH aqueous solutions with an oxidant K2S2O8 and subsequent heat treatment in air. Results show that the nanoflower is formed by self-assembly of tens of CuO nanosheets. The nanosheet is about 2μm in length, 120nm in width, and 12nm in t…
The stress wave propagation and energy dissipation in jointed rocks are investigated by split Hopkinson pressure bar(SHPB)technique and fractal theory.The influence of the irregular geometrical configuration of the joint surface on the wave propagation,inelastic deformation and energy dissipation has been analyzed.It…
The primary goal of this technology assessment is to provide an initial evaluation and technology screening for the application of a Fuel Cell Energy/Power System (FCEPS) to the propulsion of an Unmanned Underwater Vehicle (UUV). The impetus for this technology assessment is the expectation that an FCEPS has the poten…
Abstract The lanthanide complexes L 2 Ln(NO 3 ) 3 ( 3 ) and L′ 3 [Ln(NO 3 ) 3 ] 2 ( 5 ) (Stewart and Siddall III. J Inorg Nucl Chem 1971, 33, 2965–2970) were obtained, where L is the tetraethyl ester of ethylenediphosphonic acid ( 2 ), L′ is the tetraisopropyl ester of ethylenediphosphonic acid ( 4 ), and Ln is La, Ce…
Cerium dioxide films were deposited on silicon substrates by chemical vapor deposition using tetrakis (3-methyl-3-pentoxy) cerium. The deposited films were found to have a columnar structure when viewed cross-sectionally with the scanning electron microscope. The lateral variation of the film thickness was measured by…
The identification of a Rh-oxidised species of a Rh(0.29)/Ce0.68Zr0.32O2 catalyst that exhibits peculiar CO-O2 kinetics [I. Manuel, J. Chaubet, C. Thomas, H. Colas, N. Matthess and G. Djéga-Mariadassou, J. Catal. 2004, 224, 269] is addressed. For this purpose, various catalysts are studied by XANES, CO- and N2-FTIR, a…
The adsorption of boron on alumina (Al2O3) and magnesia (MgO) has been investigated in aqueous solutions as a function of pH, boron concentration, amount of adsorbent, ionic strength and temperature. Analysis of the experimental data indicates that under the optimum pH conditions, the adsorption mechanism depends on t…
The aim of present paper is the investigation of relationship between inhomogeneous deformation behavior and macroscopic deformation behavior arising in SMA during cyclic loadings. Firstly, a test system was constructed on the basis of Digital Image Correlation in order to measure inhomogeneous deformation behavior. S…