Materials Literature
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Results are reported of thermocapillary flow experiments performed aboard the Spacelab. Oscillatory thermocapillary flows were investigated in open cylindrical containers filled with 2 cS kinematic viscosity (Prandtl number = 27 at 25 °C) silicone oil. The fluid was heated by a cylindrical cartridge heater placed at t…
We conducted three sets of depth-of-penetration experiments with limestone targets and 3.0 caliber-radius-head (CRH), ogive-nose steel rod projectiles. The ogive-nose rod projectiles with length-to-diameter ratios of ten were machined from 4340Rc45 and Aer Met 100Rc53 steel, round stock and had diameters and masses of…
This article addresses a fundamental problem faced by the ab initio community: the lack of an effective formalism for the rapid exploration and exchange of new methods. To rectify this, we introduce a novel, basis-set independent, matrix-based formulation of generalized density functional theories which reduces the de…
Magnetization, heat capacity, electrical resistivity, thermoelectric power, and Hall effect have been investigated on single-crystalline Ce_2PdSi_3. This compound is shown to order antiferromagnetically below N'eel temperature (T_N) \~3 K. The Sommerfeld coefficient far below T_N is found to be about 110 mJ/K^2 mol Ce…
This paper is an introduction to some of the main present issues in the theory of structural glasses. After recalling a few experimental facts, it gives a short account of the analogy between fragile glasses and the mean field discontinuous spin glasses. The many valley picture is presented, and a brief account of rec…
The ZnO film with 6 mm symmetry is one kind of functional films with different use. The columnar microstructure in the film has an affect on the properties of materials. In this paper, ZnO/Si film was deposited by planar magnetron sputtering. The columnar microstructure was examined with SEM and TEM. The SEM cross ima…
A new synthesis technique, namely double mechanical alloying (DMA), has been developed to prepare Al-Fe-V-Si nanocrystalline powders, and during the DMA, XRD result indicate that a transformation from α-Al 13 (Fe,V) 3 Si + fcc-Al phase to quasicrystalline + fcc-Al phase was observed.
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The energetics and micromechanisms of fracture in model dynamically vulcanized thermoplastic elastomers have been studied. Their fracture toughness values have been quantified under mode 1 loading conditions using both the critical J-integral approach and an essential work-of-fracture method. Additional studies evalua…
Results from an experimental study on the rapid measurement of thermal conductivity of chemical vapor deposited (CVD) diamond films are presented. The classical thermal comparator method has been used successfully in the past for the measurement of thermal conductivity of bulk materials having high values of thermal r…
A cooperative investigation was conducted to evaluate Al-Cu-Mg-Li alloy 1441 for long service life fuselage applications. Alloy 1441 is currently being used for fuselage applications on the Russian Be-103 amphibious aircraft, and is expected to be used for fuselage skin on a new Tupolev business class aircraft. Alloy…
The grafting of N,N′-methylenebisacrylamide (N,N′-MBA) onto cellulose is carried out using the cobaltacetylacetonate complex (Co(acac)3) under nitrogen atmosphere at 40°C. The rate of graft copolymerization has been studied as a function of [N,N′-MBA], [Co(acac)3], and temperature. The activation energy of grafting is…
A laboratory investigation of NO x reduction by NH 3 over sulfated and unsulfated CuO/γ-Al 2 O 3 was carried out. The rate of the selective catalytic reduction (SCR) reaction with excess O 2 over presulfated sorbent between 325 and 425 °C in the absence of H 2 O and HCl was quantified by a first-order expression with…
Microporous polyurethane elastomer, based on 4,4′-diphenylmethane diisocyanate and polyester polyol Bayflex 2003 (Bayer AG), was degraded by phosphoric acid esters (CH3CH2O)3P(O) and (ClCH2CH2O)3P(O) at 180°C. Structure of degraded products was investigated by means of 1H-, 13C-, and 31P-NMR spectroscopy. © 2000 Joh…
Copolymer of L-lactide and ε-caprolactone [P(LLA-CL)] (50/50) was synthesized using stannous octoate and was stored at room temperature. The change in physical properties occurring during this storage at room temperature was investigated by differential scanning calorimetry (DSC), X-ray diffractometry, polarizing opti…
Beta-cyclodextrin (CD) dimers (n = 11) were synthesized and tested against eight enzymes, seven of which were dimeric or tetrameric, for inhibitor activity. Initial screening showed that only L-lactate dehydrogenase and citrate synthase were inhibited but only by two specific CD dimers in which two beta-CDs were linke…
The soft temper plates of the AA5083 alloy are widely used in the transportation industry, for example in the construction of land transportation vehicles such as tanker lorries. Currently the use of this alloy is limited to those applications where the service temperature is less than 65°C. This limitation originates…
The thermotropic mesomorphism of some cellulose derivatives (CD) based on the (2-hydroxypropyl)cellulose (HPC) was investigated. Three types of derivatives: two esters (PPC, HxPC) and cyanoethyl derivative (CEPC) were prepared. The X-ray diffraction patterns of CDs were compared with the differential scanning calorime…
We examined the effect of melt overheating on primary solidification in aluminum alloys of various systems. The alloys were poured from the temperature of overheating, and no special treatment of the melt was performed. We assessed the sizes of equiaxed and columnar grains or primary crystals and the size of dendritic…
The sequential polytripeptides and polydipeptides, (X-Tyr-Lys)n, (XGly, Ala, Pro, Ser, Leu, Ile, Phe), (Y-Lys)n, (YGly, Tyr), and (Gly-Tyr)n, which imitate a mussel adhesive protein, have been synthesized. The molecular weights of the polypeptides were estimated to be 7,200 ∼ 13,400 (19 ∼ 42 repeating units), and th…