Materials Literature
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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 (…
The feasibility of PVDF (polyvinylidene fluoride), as a novel waterproof and moisture-permeable material, to substitute PTFE (polytetrafluoroethylene) for manufacturing civil high-performance textiles was discussed. The work was focused on the design of casting solution composition (including solvent, additives, and p…
High-molecular-weight polymers of ϵ-caprolactone (CL) and maleic anhydride (MA) with anhydride group content of about 1% wt have been synthesized and studied. The polymerization reaction was carried out in bulk under nitrogen atmosphere. Stannous octoate (Sn(oct)2), and 2,2'-azobisisobutyronitrile (AIBN) were used as…
Heavily cold drawn in situ Cu–Nb composites have been investigated by transmission electron microscopy (TEM) and X‐ray analysis. Dislocation density in the copper matrix has been shown to change only slightly in the investigated drawing ratio range because of the development of stage IV of deformation. In Nb filaments…
Melt nucleation and crystallization behavior of homo-isotatic polypropylene (homo-iPP), maleic anhydride (MAH)-grafted-iPP, and MAH-modified iPP, produced from iPP and a small amount of MAH-grafted-iPP, was investigated by polarizing optical microscopy (POM), at Tc = 121–135oC. Nucleation processes at a given Tc were…
Two new cardiac glycosides called cheiranthosides VI (2) and VII (3) were isolated together with a known one, glucoerysimoside (1) from the seeds of Erysimum cheiranthoides. Based on spectroscopic data, the structures of 2 and 3 were characterized as periplogenin 3-O-beta-D-glucopyranosyl(1-->4)-beta-D-fucopyranoside…
The electrochemical polymerization of thiophene in an ultrasonic field was performed with a view to obtaining polythiophene film with a high electrical conductivity. The conductivity, polymer yield, and morphology of a film were greatly affected by the polymerization temperature, monomer concentration, and current den…
This paper deals with the influence of interface between polyethylene and semiconducting electrode on the space charge formation and electrical breakdown. Low-density polyethylene (LDPE) films attached with different semiconducting electrodes were subjected to the DC breakdown test, and corresponding space charge dist…
Excellent transparent YAG (Y3Al5O12) ceramics containing Ce additives of 0.06 to 3.8mol% and small amount of Si as sintering aids were fabricated by a simple solid-state reaction method using high-purity powders of Y2O3, Al2O3 and CeO2. Ce: YAG ceramics, after vacuum sintering at 1750°C for 10h, became fully transpare…
We investigate experimentally the behavior of microscopic ferrofluid droplets under the effect of a rotating external magnetic field. Depending on the system control parameters, the drops adopt fascinating shapes, like starfish, rod-like or pancake shapes, co-rotating with the external field, but also creeping snakes,…