Materials Literature
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The new Heraeus STU fiber, which is very similar to the radiation resistant Russian KS-4V fiber, was subjected to /sup 60/Co gamma irradiation tests for the first time. The results of spectral measurements (300-850 nm) as well as of measurements at 829 and 1310 nm with different dose rates were compared with those of…
The slow growth characteristics of a condensing ethanol sessile drop on a quartz substrate were studied experimentally. Using interference microscopy measurements of the transient liquid film profile (curvature) to obtain the pressure field and a Kelvin−Clapeyron model of interfacial mass flux to obtain the interfacia…
One hundred and thirty samples from the collection of the Natural History Museum in Florence, labeled as tetrahedrite, have \nbeen extensively studied by means of SEM, XRD, EPMA, DTA, EPR and SQUID techniques. Wide-ranging substitutions, \nconfirmed by compositional data, play a fundamental role in the thermal…
Abstract Dimeric TTFs have been synthesized by using palladium-catalyzed reactions. Although TTFs are very sensitive under oxidation conditions, the palladium-catalyzed reactions can be successfully employed for the oxidative coupling of TTF derivatives. The chemical oxidation of dimeric TTFs produced cation-radicals,…
This note deals with a nonlinear system of PDEs describing some irreversible phase change phenomena that account for a bounded limit velocity of the phase transition process. An existence result is established by using time discretization, compactness arguments, and techniques of subdifferential operators.
The application of six different kinds of characteristic vectors to recognize PD sources is studied. Four kinds of model bars are used to simulate typical partial discharges in generator stator winding. The PD signals were measured by using a computer aided digital sampling system. The sampling results are processed b…
The binding of substrates and inhibitors to wild-type Proteus vulgaris tryptophan indole-lyase and to wild type and Y71F Citrobacter freundii tyrosine phenol-lyase was investigated in the crystalline state by polarized absorption microspectrophotometry. Oxindolyl-lalanine binds to tryptophan indole-lyase crystals to a…
Stereospecific routes were followed to synthesize five new Fe3+ and Cu2+-substituted Mo-enriched Dawson-type heteropolyanions as aqueous soluble potassium salts: α2-K7[Fe(OH2)P2W12Mo5O61] and α2-K7[Fe(OH2)P2W13Mo4O61], α1- and α2-K8[Cu(OH2)P2W12Mo5O61] and α2-K8[Cu(OH2)P2W13Mo4O61]. The substituted species as well as…
Die beiden isotypen Thiosilicate KCe[SiS4] (a = 649, 15(6), b = 656, 18(6), c = 863, 96(8) pm, β = 107, 531(9)°) und Eu2[SiS4] (a = 651, 71(6), b = 659, 54(6), c = 821, 93(8) pm, β = 108, 437(9)°) kristallisieren monoklin in der Raumgruppe P21/m mit Z = 2. Bei der Umsetzung von KCl, Ce2S3 und SiS2 im Verhältnis 1 : 1…
Potentiodynamic polarisation studies were carried out on the inhibition of low carbon steel in 0.1M hydrochloric acid solution over the temperature range 20‐60°C at different inhibitor concentrations by various quaternary ammonium salts and cationic surfactants. The inhibitors examined were tetraethyl ammonium chlorid…
The chemical and morphological structure of new and post-consumer ten years old poly(propylene) based car bumpers has been investigated and their mechanical properties have been correlated to the chemical and physical degradation of the material. Poly(propylene) matrix and a rubbery ethylene-propylene phase were the c…
Abstract Chlorites from Cambrian basaltic vesicular lavas, characterized by relatively high X c (0.81-0.98), gave temperatures of formation of 285 to 350 ° C (Cathelineau's empirical geothermometer). Both the X c and temperature calculations gave results which were too high for the diagenetic conditions indicated by t…
Honeycomb-shaped monolithic catalysts offer an attractive solution to the long-standing problem of balancing the reactor pressure drop with mass transfer in fixed-bed reactors. This approach is discussed in detail in this paper based on experimental and modeling data for the dehydrogenation of ethylbenzene to styrene.…
One transistor ferroelectric nonvolatile memory with gate stack of Pt/Pb5Ge3O/sub 11//lr/poly-Si/SiO2/Si was successfully fabricated. This device features a saturated memory window of 3 V at a programming voltage of higher than 3 V from C-V and I-V measurements. The memory window decays rapidly within 10 seconds after…
The fabrication of planar waveguides by a constant-current thermal poling procedure in multicomponent glasses rich in alkali or alkaline earth ions is described. Near the anode, the dc electric field applied to the substrate separates the mobile cations into regions according to their mobility. Each region presents a…
Abstract The adsorption and immobilization of tris(2,2′-bipyridine)ruthenium(II) ([Ru(bpy)3]2+) in mesoporous silicas (C18-FSM) modified by the introduction of aluminum as well as sulfonic acid groups were investigated. The complex was immobilized by the cooperative effects of electrostatic interactions between [Ru(bp…
Infrared spectroscopic ellipsometry (IRSE), reflection absorption IR spectroscopy (RAIRS), IR transmission spectroscopy, and best-fit calculations are applied in a cooperative study to determine the anisotropic optical properties of a thin polyimide layer in the spectral range 4000–500 cm −1 . The employed anisotropic…
The first-order transformation of the supercooled liquid into the glacial state of triphenyl phosphite was investigated by differential scanning calorimetry (DSC) using two different thermal procedures. In the first procedure the transformation was analyzed by heating run DSC experiments. The glaciation process was in…
Space charge is believed to play an important role in ac electrical ageing of polymeric insulation, particularly where electrical treeing is the dominant cause of premature failure. The majority of work to date has been on the space charge characteristics under dc electric stresses, whereas work on the dynamics and th…
Abstract. In organic agriculture, where K may be a limited resource, reliable tools are important in the assessment of K availability in the soil in order to avoid K deficiency. We investigated the effect of four organic farming systems on the exchangeable K in the plough layer of a six‐course crop rotation from 1994…