Materials Literature
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Thin films of proton-conducting BaZr0.85Y0.15O2.925 perovskite-type ceramics, prepared in a sol–gel process by multiple dip-coating on silicon single crystal wafers, and powder samples, prepared by the conventional carbonate route, were charged with hydrogen by dissociative water absorption at definite values of water…
Nephrogenic diabetes insipidus (DI) secondary to chronic urinary tract obstruction is a rare disease. The exact cause is unknown but it is likely that increased collecting duct pressures cause damage to the tubular epithelium, resulting in insensitivity to the action of arginine-vasopressin (AVP). A 77-year-old man co…
Magnetite nanoparticles with an average particle size of 7.5 nm were studied by Mössbauer spectroscopy in the 100–300 K temperature range. Using experimental data on the temperature variation of isomer shifts in the partial spectra of 57 Fe nuclei in the A and B crystal sublattices, the linear thermal expansion coeffi…
Aluminosilicate MCM-41 samples in the as-prepared form and modified by deposition of carbonaceous compounds formed during conversion of cyclohexene were investigated by nitrogen adsorption. The amount of the deposits decreases with the reaction temperature and increases with the quantity of aluminium incorporated into…
A novel osmium-metal coating device for SEM observation has been developed to prevent negative charge build-up on specimens by applying the hollow-cathode low voltage discharge plasma chemical vapour deposition (CVD) method. The CVD method using the hollow-cathode offers the following advantages. (i) The method can de…
Ir(acac)3 supported on a carbon fiber-anode catalyzed the oxidations of alkanes (cyclohexane, n-hexane, adamantane) by generating strong electrophilic oxygen species from H2O at 1.3 V (Ag|AgCl) with high current efficiency, for example, 45% for cyclohexanone formation.
A new self-designed mechanochemical reactor, inlaid pan-mill, was used in studying high density polyethylene (HDPE). The effects of pan-milling stress on the structure and properties of HDPE were investigated. Gel permeation chromatography, melt indexer, Fourier transformed infrared spectroscopy, electron spectroscopy…
Our research has shown that mono-phase cubic zirconia has the highest loading capacity for Pu (not less than 10 wt. %) in the form of Zr-Pu solid solution. Zircon host-phase provides complete incorporation of 6.9 wt. % Pu into zircon crystalline structure; however, higher Pu loading into initial precursor phases cause…
In this study the superelastic effect of Fe–Mn–Si–Cr shape memory alloys was investigated using a coil which permits the measurement of small strain. Fe–Mn–Si shape memory alloys were found to exhibit superelastic behavior to some extent over a temperature range above As. Superelastic behavior was most pronounced in t…
The noncontact technique that is described uses atomic oxygen, generated under low pressure in the presence of nitrogen, to remove soot and charred varnish from the surface of a painting. The process, which involves surface oxidation, permits control of the amount of surface material removed. The effectiveness of the…
The structure of extruded Ca(PO 3 ) 2 glass was characterised by measuring optical birefringence, thermal expansion and two dimensional rotorsynchronised nuclear magnetic resonance spectra using magic angle sample spinning (2D MAS NMR). The results give evidence not only of a macroscopic structural anisotropy but also…
New glasses in the quaternary system AgI-Ag 2 O-TeO 2 .B 2 O 3 have been synthesised by rapid quenching from glass melts. The ratio between B 2 O 3 and TeO 2 was kept constant, B 2 O 3 :TeO 2 =1. Glasses were obtained with up to 50 mol% AgI. Above this value, β/γ-AgI crystallised in the amorphous matrix. It is seen fr…
Polyhydroxyalkanoate, abbreviated to PHA, is a family of polyesters produced by a variety of microorganisms. Over 90 PHA with various structure variations have been reported and the number is still increasing. Some interesting physical properties of PHA such as piezoelectricity, nonlinear optical activity and biocompa…
Mn-Al-C magnet has been produced by powder-extrusion process since 1989. It is known that rapidly solidified powder improves the magnetic properties of magnet. In this work, the possibilities to improve magnetic properties for powder-extrude Mn-Al-C-alloy were studied by using heat treated gas atomized powders. The ef…
アルコキシシラン化合物を用いて, 処理条件がシロキサン形態に及ぼす影響を検討した. シロキサン形態はFT-IRの拡散反射法で分析した. 試料はアルコキシシラン溶液で直接処理したKBrを用いた. 処理条件と鎖状シロキサンの生成割合との関係を評価した結果, 処理液濃度が低くなるとシロキサン結合は形成しにくく, 鎖状シロキサン成分の生成割合が高くなることがわかった. この傾向は, トリメトキシ系よりもジメトキシ系のアルコキシシラン化合物で顕著であった. メトキシ基に比べてエトキシ基を末端にもつアルコキシル化合物は, 鎖状シロキサンの生成割合が低かった. 一方, 低沸点の溶媒を処理液に用いた系は, 鎖状シロキサン生成割合が増加した. この…
Use of the fully digitized X-ray diffraction pattern for phase quantification has proven to be the most effective approach to achieving the theoretical accuracy potential of 1 % absolute. The digitized database quantification technique, DDBQ, was developed in the 1980s. Appropriate reference patterns are stored in sma…
Parametric statistical methods assume samples that have a normal distribution and representative sample sizes (i.e. n >20). Quantitative electron microscopy is inherently restricted to small sample sizes and a priori there is no way to know if the expression of the ligand being studied has a normal distribution. Thus…
Oxidation tests were conducted at 450°C in air for Zircaloy-2 and modified alloys. The results showed breakaway oxidation, as has been reported previously. The microstructures of the oxide films were examined by transmission electron microscopy (TEM). Cross-sections were prepared from test samples with various thickne…
Understanding protein folding requires the determination of the configurational space accessible to the protein at different stages in folding. Here, computer simulation analysis of small angle neutron scattering results is used to probe the change in the distribution of configurations on strong denaturation of a glob…
Pathologic calcification is thought to be the main cause of failure in the present generation tissue valves fabricated from glutaraldehyde pretreated bovine pericardium (BP). The present investigation describes the in vitro calcification and enzymatic degradation of bovine pericardia after hexamethylene diisocyanate (…