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。
Abstract The solubility of CO 2 in PETG, a glycol‐modified PET, was measured at different temperatures and over a broad pressure range, and diffusion coefficients were derived at the corresponding conditions. The solubility of CO 2 is quits high. For example, almost 15 wt% CO 2 can be dissolved in PETG at 35°C and 6.0…
The conventional model for multiwinding transformers is difficult to relate to its physical construction, and the measurement of the model parameters is difficult and unreliable. In this paper a physically-based electrical model of a high voltage multi-winding transformer is presented. Each component in the electrical…
Abstract The aim of this paper is to identify the controls on the rates of illitization in Texas Gulf Coast shales under diagenetic conditions. Two different mineral transformations are considered: the transformation of smectite to (nearly) illite and the precipitation of discrete illite, i.e., the formation of pure i…
Principles of protein thermostability have been studied by comparing structures of thermostable proteins with mesophilic counterparts that have a high degree of sequence identity. Two tetrameric NADP(H)-dependent alcohol dehydrogenases, one from Clostridium beijerinckii (CBADH) and the other from Thermoanaerobacter br…
Energy and electron transfer processes taking place in [3]-rotaxanes containing various photo- and electro-active metal-complex fragments, such as zinc(II)- and gold(III)-porphyrin stoppers, copper(I)- and silver(I)-bis-phenanthroline complex moieties, were studied by spectroscopic steady state and time resolved techn…
We examine the phenomenon of dynamical heterogeneity in computer simulations of an equilibrium, glass-forming liquid. We describe several approaches for quantifying the spatial correlation of single-particle motion, and show that spatial correlations of particle displacements become increasingly long range as the temp…
This paper presents the results of studies of the dielectric relaxation of nematic 6CHBT obtained for different values of the angle between the directions of the macroscopic orientation of the sample (director n) and the probing electric field E. Analysis of the evolution of the relaxation spectrum from ε*‖(ω) (E‖n) t…
Nickel‐positive electrodes obtained by electrochemical impregnation of aluminum‐substituted hydroxide are found to deliver a reversible discharge capacity of . This is much higher than the capacity of hydroxide electrodes [ : this work; : Dixit et al., J. Power Sources, 63 , 167 (1996)] prepared under identical condit…
Manganese-promoted active carbons have been studied as catalysts for selective catalytic reduction with ammonia. Activity, selectivity and stability depend on the preparation procedure, the choice of the precursors and the chemistry of the starting support. The highest activity in the low-temperature region was shown…
The transition from the lamellar (lam) to the gyroid (gyr) phase in the melt of a poly(oxyethylene)–poly(oxybutylene) (EB) diblock copolymer was shown to proceed via an intermediate perforated lamellar (pl) structure. The transition was studied starting from a shear-oriented lamellar phase using synchrotron small-angl…
Three polyurethane (PU) vascular grafts with novel designs were investigated and compared in terms of the microporous structure, reinforcement technology, polymer chemistry, microphase separation, and mechanical properties. The Corvita graft, composed of a poly(carbonate urethane) polymer, displayed a helically wound…
The full Euclidean symmetry groups for all the single-wall carbon nanotubes are non-Abelian non-symorphic line groups, enlarging the groups reported in the literature. For the chiral tubes ( n 1 , n 2 ) ( n 1 > n 2 >0) the groups are L q p 22 = T r q D n , where n is the greatest common divisor of n 1 and n 2 , q = 2(…
Fly ash, used in conjunction with bis(triethoxysilylpropyl)tetrasulphane (TESPT) as coupling agent, has been investigated as a reinforcing filler for polyisoprene compounds. The TESPT adsorption isotherm on silica showed that in forming a monolayer, the molecule assumes an inverted U conformation on the surface. With…
B-doped diamond films were deposited by large-area hot filament chem. vapor deposition (HFCVD) on Si and different industrial electrode materials, such as Ti, Zr, Nb, Ta, W, and graphite, with areas up to 50 * 60 cm2. B-doping levels ranging from 50 to several thousand ppm were realized using trimethylborate. These el…
Heteroleptic yttrium bis(dimethylsilyl)amide complexes featuring chelating N,N′-bis(3,5-di-tert-butylsalicylidene)ethane-1,2-diamine (H2L1) and trans-1,2-bis(2,4,6-triisopropylbenzenesulfonamido)cyclohexane (H2L2) ligands were immobilized on mesoporous silica MCM-41 according to a heterogeneously performed silylamide…
The mechanical relaxation behaviors of oriented samples of a linear low-density polyethylene (LLDPE) and a high-density polyethylene (HDPE) were studied using tensile dynamic mechanical measurements. The anisotropy and activation energies of the relaxations were determined for several different samples to investigate…
The dithiadiazolyl radical p-BrC6F4CNSSN· 2 retains its monomeric nature in the solid state; variable temperature magnetic studies on 2 indicate Curie–Weiss behaviour (θ = –27 K) above 60 K with an effective magnetic moment of 1.45 µB at room temperature; the absence of long-range magnetic order down to 1.8 K is attri…
Synthesis of the new macrocycle 1,4,8,11-tetraazacyclo-tetradecane-2,3-dione [exo02]cyclam and its complexation with copper(II) ion via the tetraaza groups and linkd together through a copper(II) ion coordinated to the exo-cis oxygen donors of each macrocycle.
Complete assignment of the 13 C NMR lines is reported for both isotropic and oriented samples of antiferroelectric liquid-crystalline MHPOBC. Two-dimensional double-quantum coherence spectroscopy (2-D INADEQUATE) in the isotropic phase and field alignment-induced shifts (AIS) were studied. 19 F− 13 C dipolar quartets…
Thin films of the perovskite strontium bismuth tantalate (SBT) have a large potential application as capacitors in non-ferroelectric computer memories. The MOCVD of SBT has, however, been severely restricted by lack of suitable precursors. This paper reports on the use of novel alkoxide precursors containing both stro…