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 alteration of phase stability due to the continuous production of forced atomic displacements, as is the case under irradiation, is studied. A simple kinetic model of a binary alloy exhibiting phase separation is investigated, and two limiting cases are considered: nearest-neighbor ballistic exchanges and arbitrar…
We report the synthesis of octacationic macrocycles based on the porphyrazine (tetraazaporphyrin) core. The first stage is the synthesis of Mg(II) 2,3,7,8,12,13,17,18-octakis(4-pyridyl)porphyrazine, [Mgpz(pyr)(8)], and the parent [H(2)pz(pyr)(8)]. Both compounds are freely soluble in aqueous acid due to protonation of…
The synthesis of several new phthalonitriles 3, 9, 14, 25, 33, and 36, functionalised with carboxyl groups, including two examples of amino acid derivatives is described. All new phthalonitriles were converted into their corresponding phthalocyaninatozinc compounds. The phthalocyanines, 2,3,9,10,16,17,23,24-octa(1-car…
Earlier investigations by the authors showed that the tensile modulus of flax fibre mat polypropylene composites (NMT) could surpass the values of glass mat reinforced thermoplastic (GMT) on fibre weight basis. The tensile and flexural strength could reach values of up to 65% of the GMT strength values, however, very…
The local electrochemical and chemical characteristics of intrinsic breakdown sites on organically coated aerospace alloys were investigated. Local electrochemical impedance spectroscopy and mapping were used in conjunction with capillary electrophoresis, local pH, and local open‐circuit potential measurements to clas…
Pair particle nanostructures were prepared in porous anodic aluminum oxide films via a modified template synthesis procedure. By varying the interparticle distance of centrosymmetric gold spherical particles (radius ca. 32 nm), the linear UV/visible polarization spectra of the gold particle/porous alumina film composi…
The contamination performance of non-ceramic (NO insulators is better than porcelain insulators. The paper describes the pollution collection mechanism and concludes that silicone rubher insulators collect more pollution than porcelain insulators. Long term exposure of silicone rubber insulators produces a thin layer…
Abstract Simple shear plastic deformation behavior of polycarbonate (PC) plates due to the novel equal channel angular extrusion (ECAE) process is modeled using a commercial finite element methods (FEM) package. The true stress and true strain contour plots as well as the strain rate variation across the PC plate duri…
The increasingly widespread use of synchrotron-radiation sources and cryo-preparation of samples in macromolecular crystallography has led to a dramatic increase in the number of macromolecular structures determined at atomic or near-atomic resolution. This permits expansion of the structural model to include anisotro…
This paper summarizes the result of the questionnaire on current status of non-ceramic (composite) insulators in the world conducted by the Non-ceramic (composite) Insulators Technical Committee, Japan. Current use status, reasons for use, maintenance, failure occurrence and research activity of 16 responding utilitie…
The dipeptide Gly-L-Ser was crystallized as part of a study on hydrogen-bonding patterns in the structures of dipeptides. Hydrogen-bond donors and acceptors have been assigned ranks (1 is best, 2 is next best etc.), and the observed hydrogen-bond connectivity is compared with the hypothetical pattern in which the rank…
Surface-enhanced Raman scattering (SERS) has proved to be an effective technique for studying the structural properties of conducting polymer thin films. The enhancement process has a twofold origin, electromagnetic and chemical. The electromagnetic enhancement, which is the dominant mechanism in SERS generation, cons…
Random copolymers of ethylene and butene contain crystallizable sequences of different length l . Isothermal crystallization of model ethylene−butene random copolymers having 21 and 73 branches per 1000 backbone carbon atoms was studied by differential scanning calorimetry (DSC). Two melting peaks, which correspond to…
In-situ attenuated total reflection (ATR)-FTIR spectroscopy enabled studies on the interaction between the differently charged model proteins human serum albumin, lysozyme, immunoglobulin G and multilayer assemblies, which were deposited by alternating adsorption of poly(ethyleneimine) and poly(acrylic acid) onto Si c…
For a series of semicrystalline ethylene−α-olefin copolymers (linear low-density polyethylene, LLDPE) produced by metallocene and Ziegler−Natta polymerization, the effect of the copolymer composition on the morphology and the evolution of linear viscoelastic properties during isothermal crystallization was studied. Th…
A mixed-valence state, formally denoted as ${\mathrm{Fe}}^{2.5+},$ is observed in the 300 K M\"ossbauer spectra of the most reduced samples of ${\mathrm{SmBaFe}}_{2}{\mathrm{O}}_{5+w}.$ Upon cooling below the Verwey-type transition temperature ${(T}_{\mathrm{V}}\ensuremath{\approx}200\mathrm{K}),$ the component assign…
The heat capacity measured in an adiabatic heat pulse calorimeter with nonzero heat capacity suffers from intrinsic errors in the vicinity of a first order phase transition. When these errors are carried over into the calculation of the magnetocaloric effect, the latter also suffers from large systematic errors. The s…
The behavior of the energy of stacking fault defects in copper as a function of external strain and temperature is investigated making use of molecular-dynamics simulations. Atomic interactions are modeled by an effective-medium theory potential. Intrinsic, extrinsic, and twinning faults are considered. Our results su…
Temperature dependent measurements of Young’s modulus were performed for the first time on black and transparent bulk material of chemical vapor deposited (CVD) diamond by a dynamic three point bending method in a temperature range from −150 to 850 °C. The CVD specimens correspond to a room-temperature Young’s modulus…
Scanning electron microscopic studies of silica valve formation in naviculoid diatoms representing six different genera revealed that the precise sequence of depositional events varied among genera. Valve deposition begins with the formation of the raphe sternum, from which virgae (lateral outgrowths) extend. Areolae…