Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The stability as well as the electrical properties of both unirradiatedand γ-irradiated poly(vinyl alcohol)-PVA films doped with MnSO4.H2O at adefinite concentration of 15% have been studied. The dielectric loss tangent tanδ, electrical conductivity σ and dielectric constant ε’ in the frequency range100 Hz-20 KHz were…
A comparative study of different carbon materials (C60 fullerene; soot, both with and without fullerenes; graphite; and industrial carbon black) as additives to industrial lubricating oils has been carried out for copper-steel and steel-steel sliding couples. The soot containing fullerene and the powder of pure fuller…
Vayrynenite, (Mn2+0.78Fe2+0.23Mg0.01)Be(PO4)(OH0.92F0.08), is monoclinic, a 5.4044(6), b 14.5145(12), c 4.7052(6) A, β 102.798(9)°, V 359.91(7) A3, space group P 21/ a , Z = 4. The structure was refined to an R index of 1.5% based on 1001 observed [| F o| > 5σ F ] for reflections measured with Mo K α X-radiation using…
Abstract The single-crystal X-ray structure of tungstenian wulfenite- I 4 1 / a containing 10 mol.% WO 3 from the San Francisco mine, Sonora, Mexico, space group I 4 1 / a , a = 5.436(2), c = 12.068(8)Å and Z = 4, has been refined to R = 0.052. The Mo and W are disordered over special position 4 a (0,0,0) in the latti…
The anharmonic effective pair potentials V ( u )= a u 2 /2+ b u 3 /3!+ c u 4 /4! for Br–Cu bond in γ- and α-CuBr under pressure have been investigated by an extended X-ray absorption fine structure (EXAFS) technique. The EXAFS spectra near the Br K-edge were measured under high temperature and high pressure using a la…
Acidization is one of the most important techniques to increase the productivity of crude petroleum oil and gas wells. The effective way for protecting these oil well tubular materials is by using corrosion inhibitors during the acidization process. The present study deals with the evaluation of inhibition effect of e…
A cost efficient manufacturing route for ceramic matrix composites (CMC) has been developed by DLR. Starting with a carbon fibre reinforced plastic composite and converting the matrix from carbon to silicon carbide via the reaction with liquid silicon, CMC materials of high mass specific properties and of excellent th…
The sessile drop method has been used to determine the time dependence of the contact angle at 850°C in vacuo for Ag–28 wt% Cu, Ag–35 wt% Cu–1.5 wt% Ti, and Ag–27 wt% Cu–12 wt% In–2 wt% Ti on vitreous and devitrified fused quartz substrates. Nonwetting behavior (θ > 90°) was observed for Ag–28 wt% Cu on both substr…
A pilot apparatus of a regenerative catalytic oxidizer (RCO) equipped with two electrical heaters and two 20-cm i.d. x 200-cm height regenerative beds was used to treat methyl ethyl ketone (MEK) and toluene, respectively, in an airstream. The regenerative beds were packed with gravel (approximate particle size 1.25 cm…
Photoluminescence spectra were observed for hydrogenated oxygen-rich silicon oxynitride films with different N/O ratios, deposited by plasma-enhanced chemical vapor deposition. In the sample with a small ratio of N/O, two luminescence bands at 4.4 and 2.7 eV originated from silicon homobonds in SiO 2 were observed, wh…
The technique of noble metal treatment, such as noble metal coating (NMC) or noble metal chemical addition, accompanied by a low level hydrogen water chemistry, is being employed by a number of nuclear power plants around the world for mitigating intergranular stress corrosion cracking in the vessel internals of their…
Nacrite has been intercalated with two polar organic molecules: dimethyl sulfoxide (DMSO) and N -methylacetamide (NMA). The homogeneous nacrite complexes have been studied by X-ray diffraction (XRD) and infrared (IR) spectroscopy. The XRD study is based on a comparison between experimental and calculated patterns. The…
We present a special shear cell for aligning unconventional liquid crystals and performing high temperature optical studies. Sample thicknesses of 1–100 μm in the temperature range of 20–200 °C with a shear amplitude as large as 1 mm are achievable with this cell. The shear cell was used to align banana-shaped liquid…
It was found that finely dispersed metals (nanometals) at low addition (≤1% wt.) increase flammability of neat polypropylene in spite of strong enhancement of char yield. The nanometals do not seriously affect flammability of neat epoxy resins. On the other hand, it was shown that the nanometals are very efficient co-…
Polycrystalline (CeS) 1.15 (TaS 2 ) 2 and (SmS) 1.19 (TaS 2 ) 2, two composite misfit-layered sulfides, react directly with cobaltocene (CoCp 2 ) in acetonitrile solutions to form novel intercalation compounds of composition (CeS) 1.15 (TaS 2 ) 2 (CoCp 2 ) 0.31 and (SmS) 1.19 (TaS 2 ) 2 (CoCp 2 ) 0.30, respectively. T…
The localised corrosion resistance (pitting and crevice corrosion) of two high alloy stainless steels, namely superduplex (SD) and superaustenitic (SA), has been studied in chloride-fluoride solutions at pH values ranging from 2 to 6.5. The pitting potential (Epit) and crevice potential (Ecre) have been calculated for…
The R-specific alcohol dehydrogenase (RADH) from Lactobacillus brevis is a valuable catalyst for the production of chiral alcohols that can be used as synthons in asymmetric syntheses. RADH is a homotetramer with 222 symmetry and a molecular mass of 107 kDa. The recombinant enzyme has been expressed in Escherichia col…
Diatom, hydrocarbons and fatty acid sedimentary records were used for reconstructing the recent (last 150 years) palaeolimnological history of Laguna Chica of San Pedro (Concepción, VIII Región, Chile). Cluster analyses (Constrained Incremental Sum of Squares) on the diatom data revealed three distinct periods. The fi…
Time and humidity greatly influence particle adhesion and removal in many particlesubstrate systems. The effect of time (aging) and humidity on the adhesion and removal of 22 μm PSL (Polystyrene Latex) particles on polished silicon wafers is investigated. The results show that the effect of time on the adhesion and re…
To improve the wrinkle recovery as well as the performance properties of garments, wool fabric is treated separately with epoxide, silicone polymers, and a mixture of the two, where the two reagents are sequentially applied in a simple pad-dry-cure process. Each reagent improves the wrinkle recovery of wool by a diffe…