Materials Literature
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A series of acid catalysts was prepared by heating of NH 4 -saturated montmorillonite at 200-600 °C for 24 h. Their catalytic activity was tested in acetylation of 3,4,5-trimethoxybenzaldehyde with acetic anhydride. This reaction is sufficiently sensitive to modification of the catalyst and thus suitable for testing c…
We analyze dielectric data obtained on PZT-5A samples which had been electrically deaged in a well defined way. Thus the exponent a of the power law characterizing the ac-field dependence of the effective dielectric coefficient ϵ11* could be determined with high accuracy. The result α′=1.10(1) and α″= 1.07(1) obtained…
Visible light irradiation of thin films of a main-chain liquid crystalline poly(aryl cinnamate) using ketocoumarins as triplet sensitizers leads to photochemical crosslinking and UV-vis and FTIR spectroscopic changes associated with saturation of the cinnamate double bond, most likely by 2 + 2 photocycloaddition. The…
Possibility of the ferroelastoelectric behavior manifestations in a uniaxial ferroelectric TGS crystal was investigated. Analysis of the spontaneous piezoelectric moduli tensors for each of the 180°-domains formed as a result of the phase transition in TGS revealed possible directions for simultaneous application of t…
Zeolite-modified chloranil (2,3,5,6-tetrachloro-p-benzoquinone) exhibits improved performance as a battery negative in comparison with an unmodified chloranil negative. A zinc–chloranil secondary battery incorporating the zeolite-modified negative yields 107 cycles in contrast to 50 cycles in the absence of the zeolit…
In this study, we synthesized 1,1,1-trimethlyolpropane (TMP)-based diol which has a pendant anionic group and a reactive double bond in the pendant cyclic ring. Then, a water-based urethane acrylate crosslinking agent (CA) was prepared from isophrone diisocyanate (IPDI), 2-hydroxyethyl acrylate (2-HEA), and a low mole…
We report the results of first-principles calculations on the electronic structure in ferromagnetic and non-magnetic hexagonal Mn V ( V = As, Sb, Bi). The calculations are based on the local-spin-density approximation (LSDA) of the density-functional theory (DFT) as well as the atomic sphere approximation (ASA) in the…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation P. K. Davies, L. Farber, M. Valant, M. A. Akbas; Cation ordering and dielectric properties of PMN…
The stress corrosion cracking (SCC) susceptibility of several Fe-Ni-Cr-Mo alloys, which are candidate materials for high-level radioactive waste containers, was evaluated using slow strain rate and fracture mechanics testing. Slow strain rate tests of type 316L stainless steel (SS) and alloy 825 were performed in hot,…
Автоэмиссионные катоды (холодные эмиттеры) на нанокристаллических углеродных и наноалмазных пленках (физика, технология, применение), Рахимов А.Т.
The lowest-energy way to enclose and separate two planar regions of prescribed areas is found, where the energy is given by the l1 norm ('Manhattan metric'), in which horizontal and vertical directions use less energy than other directions, as in some crystals. With the assumption that interfaces carry a fraction lamb…
I give a brief introduction to Luttinger liquids. Luttinger liquids are paramagnetic one-dimensional metals without Landau quasi-particle excitations. The elementary excitations are collective charge and spin modes, leading to charge-spin separation. Correlation functions exhibit power-law behavior. All physical prope…
A new method is proposed to remove NO x and SO 2 simultaneously for flue gas cleanup. NO is first oxidized to NO x(x 1 5), and then is scrubbed together with SO 2 by aqueous ammonia and recovered as fertilizer. The key step is the selectively catalytic oxidation of NO in the gas phase. By using the quantitative analys…
OCTG (Oil Country Tubular Goods) and line pipes used for production and transportation of oil and gas are the major steel products which suffer hydrogen embrittlement (HE) because they are often exposed to wet hydrogen sulfide (sour) environments, where a lot of hydrogen enters the steel. Typical damage types of HE ar…
Amorphous graphite slurries used in flushing operations were conditioned at pH4.2 in the presence of chelatin and reducing agents both to release graphite and clayey particles and to enhance the hydrophobicity of the graphite surface. Graphite particles were first extracted from the aqueous slurry using a kerosene-bas…
The influence of cutting speed on the behavior of crater wear on tool face using different three kinds of high-speed steel hob materials in dry hobbing was mainly investigated in this paper. Experiments were carried out using a fly tool. As a consequence, the following points were clarified : (1)From cutting speeds of…
The reaction of AuCl(PPh3) in THF with [Co6C(CO)15]2−1 afforded [Co6C(CO)15{AuPPh3}]−3, with a metal skeleton consisting of a Co6C trigonal prism capped by a AuPPh3 group. 3 incorporated a new AuPPh3+ fragment giving [Co6C(CO)13{AuPPh3}2] 4. The crystal structure of 4 reveals that the metal skeleton consists of a coba…
Partially saturated furo [3,4-c]thieno [2,3-d]pyrazoles (7-10) have been submitted to 1,3-dipolar cycloaddition with a variety of nitrilimines.The competitive formation of products due to the dipolar attack at different dipolarophilic sites has been observed.The experimental evidence is discussed by taking into accoun…
Thin films of proton-conducting BaZr0.85Y0.15O2.925 perovskite-type ceramics, prepared in a sol–gel process by multiple dip-coating on silicon single crystal wafers, and powder samples, prepared by the conventional carbonate route, were charged with hydrogen by dissociative water absorption at definite values of water…
Nephrogenic diabetes insipidus (DI) secondary to chronic urinary tract obstruction is a rare disease. The exact cause is unknown but it is likely that increased collecting duct pressures cause damage to the tubular epithelium, resulting in insensitivity to the action of arginine-vasopressin (AVP). A 77-year-old man co…