Materials Literature
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ДВУХВРЕМЕННЫЕ ФУНКЦИИ ГРИНА И ДИАГРАММНАЯ ТЕХНИКАОбсуждаются вычисления динамической спиновой восприимчивости и корреляционных функций в модели Гейзенберга, основанные на составлении уравнений движения для двухвременных функций Грина.На основе метода проектирования типа Мори выводится точное уравнение Дайсона с массов…
SBA-15 mesoporous materials were successfully prepared by the conventional hydrothermal method and used as the support for TiO2 loaded SBA-15 photocatalysts. The synthesized materials were characterized by XRD, PL, FT-IR, BET and TEM. We also examined the activity of these materials as photocatalysts for the decomposi…
Hard clams of the genus Meretrix are known to excrete a long, thick cord of mucous from the base of their siphons, but few studies have examined the clams' use of this mucous cord as a means of passive locomotion, which may result as the cord is dragged about by water currents. In the present study of Meretrix lusoria…
The interface and thermal expansion behaviour of aluminium matrix composite (Al-3Mg) unidirectionally reinforced with continuous high modulus and high thermal conductivity carbon fibres Thornel K1100 were studied. The composite was prepared by gas pressure infiltration and was subjected to thermal cycling from room te…
The RESA-1 neutron engineering diffractometer in the JRR-3 (Japan Research Reactor No.3) at the Japan Atomic Energy Agency, which is used for stress measurements, was upgraded to realize residual stress measurements of large scaled mechanical components. A series of residual stress measurements was made to obtain thro…
Pollution free catalyst is an attractive area of current interest. The p-Aminophenol is one of the most significant catalyst, because it involves the manufacture of various pharmaceuticals. Crosslinked poly(styrene)-co-poly(4-vinylimidazole) (PSPVIM) was prepared by varying the crosslinked monomer ratio as 2% and 10%…
The polyimide (PI) films of pyromellitic dianhydride-oxydiamiline (PMDA-ODA) were fabricated using vapor deposition polymerization (VDP) method under high vacuum pressure of 10-4 Pa level. The influence of equipment, substrate temperature, the process of heating and deposition ratio of monomers on the surface roughnes…
We present results of microwave measurements of four different nematic mixtures which were prepared out of a tolane matrix by adding some specific quaterphenyl containing LC-compounds. Those high birefringent matrices lead to the improved performance within the microwave wave range. The measurements were done by using…
10.4149/km_2011_3_197
This review describes recent developments in the field of membrane reactors for obtaining high-purity hydrogen from organic chemical hydrides using hydrogen-selective amorphous silica membranes prepared by chemical vapor deposition. The application of such membrane reactors for hydrogen production reactions enables us…
高強度低合金油井管ならびにラインパイプの水素脆化現象および近年の開発状況を概説した．油井環境では硫化物応力割れ（Sulfide Stress Cracking, SSC）が硫化水素含有（サワー）環境からの水素吸収と引張負荷応力の元で発生し，このSSCが高強度油井管にとっては主要な問題となる．高強度油井管の耐SSC性の改善のため，様々な冶金的改善が取り組まれてきた．1990年代には110 ksi（降伏強さ758 MPa） 級の耐サワー油井管が結晶粒微細化とP, S, Mnなどの偏析元素の低減により開発されている．2000年代には，介在物の微細化，転位密度の低減，炭化物の形態制御により125 ksi（降伏強さ862 MPa）級の高強度…
Shear deformation of subsurface layers in wire drawing leads to marked non-uniformity of strain across the wire cross section. In wires intended for products operating under dynamic loads, such as ropes and springs, the variance in work hardening level across the cross section may cause fatigue fractures. <In this pap…
This study was conducted to investigate the effect of short-time heat-treatment and fine-particle bombarding (FPB) on the fatigue strength of Ti-6Al-4V alloy. The short-time heat-treatment was performed at 953~1203 K for 60 s. Then, the changes in hardness and mechanical properties were investigated. The yield strengt…
Due to the requirements of energy-saving and environmental protection,lightweight dominates the modern structural design.As the lightest structural metal,magnesium(Mg) is attracting more and more interests from both industrial and academic circles.However,magnesium alloy parts are mainly manufactured by die casting du…
Cellulose consists of amorphous and crystalline portions. While crystalline cellulose consists of long chains bound together by strong hydrogen bonds, amorphous cellulose is made up of shorter and weaker chains (Paakkari, 1989). These structural features attribute to amorphous cellulose more susceptibility to hydrolys…
Pyrolysis oils from several sources have been analyzed and used in corrosion studies which have consisted of exposing corrosion coupons and stress corrosion cracking U-bend samples. The chemical analyses have identified the carboxylic acid compounds as well as the other organic components which are primarily aromatic…
The quality of the model used to describe a structure is the main value of the scientific selection of technical analyses. This theoretical-experimental analysis shows the quality of modern dynamic modeling when it comes to modeling structures using linear members (1D finite elements). A tower crane structure is obser…
The North American forest products industry has for many years been subject to low return on investment and cyclical demand for commodity products such as kraft pulp and newsprint. In the last five years, there has been a significant decline in both the kraft pulp and newsprint production due to increased competition…
The production of microalloyed steels for oil and gas transmission pipelines has increased significantly over the past years.With more and more countries developing their own capabilities to produce pipeline steels to support their own internal pipeline infrastructure development,there has been an increase of steel pr…
For most of the active pharmaceutical ingredients, poor aqueous solubility and hence low bioavailability and erratic absorption is the common difficulty observed by the formulation development scientist. Nanotechnology drug delivery has gained much interest as a way to improve the solubility problems. Nanosuspension i…