Materials Literature
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The calorimetric parameters of Se 85 Te 15 glass have been investigated using differential scanning calorimetry under non-isothermal conditions at four different heating rates (5, 10, 15 and 20 °C min −1 ). The glass transition temperature and peak temperature of crystallization are found to increase with increasing h…
Abstract Poly(ε‐caprolactone) (PCL) substrates were modified with thermoresponsive poly(N‐isopropylacrylamide) (PNIPAM) brushes to direct and control cellular attachment and detachment. Prior to brush growth, the surface of PCL was activated by a diamine to allow for initiator coupling. Infrared spectra taken before a…
Broken rails can cause train delays, trains cancelations and, unfortunately, they are common causes of accidents.This aff ects planning of a resources, budget and organization of railway track maintenance.Planning of railway track maintenance cannot be done without an estimation of number of rails that will be replace…
The present work demonstrates by means of two practical examples the extreme importance of examination of cross sections of metal threads to obtain an overview of their structure and of the different materials employed in their manufacture. Problems that might be caused by disturbance of surface features during polish…
In this paper, my experience of over 30 years in carbon materials and carbon nanotube (CNT) researches is reported. Moreover, an overview of the background of the development of CNT synthesis, the present status of CNT science and technology, and the future prospect of CNTs are described.
We revisit grain growth and the puzzle of its stagnation in thin metallic films. We bring together a large body of experimental data that includes the size of more than 30,000 grains obtained from 23 thin film samples of Al and Cu with thicknesses in the range of 25 to 158 nm. In addition to grain size, a broad range…
The Ni-Cu ferrites, Ni1−x Cu x Fe2O4 (0.0 ≤ x ≤ 1.0) were prepared by using the sol-gel method. The X-ray diffraction patterns of all the samples showed the formation of a single-phase spinel structure. The lattice parameter was found to increase with increasing copper concentration. The electrical properties, such as…
We theoretically study the electronic structure (spectral functions and Fermi surfaces) of incommensurate pseudogap and charge density wave (CDW) and commensurate CDW phases of quasi-two-dimensional diselenides 2H-TaSe2 and 2H-NbSe2. The incommensurate pseudogap regime is described within the scenario based on short-r…
We present results of an experimental photophysical study of a series of novel brominated and non-brominated porphyrins that contain phenyl, carbazole, or triphenylamine in the meso-position. In addition we have looked at the effects of incorporating a zinc metal into the porphyrin system relative to the free base. St…
Numerical estimations of Vickers Microhardness, H V , for rhenium borides (ReB, ReB2, ReB4), carbides (Re4C, Re2C, ReC), and nitrides (Re3N, Re2N, ReN, ReN2, ReN4) as well as for some ternary rhenium diborides (Re1−x M x B2, M = W, Tc, Os, Ir) have been made based on the empirical correlations of H V dependence on she…
Supercapacitors are a class of energy-storage device able to work at much higher current densities than batteries to meet surge energy requirements. On page 431, Z. Li, L. Zhang, and co-workers carbonize a daily waste, eggshell membrane, and use it as a high-performance supercapacitor. The 3D macroporous structure com…
N,O-Carboxymethyl chitosans were synthesized by the reaction between shrimp, crab and squid chitosans with monochloroacetic acid under basic conditions at 50°C. The mole ratio of reactants was obtained from various reaction conditions of shrimp chitosan polymer and oligomer types. The mole ratio 1:12:6 of chitosan:sod…
N ew series of cadmium bismuth borate (CBBC) glasses have been developed by varying bismuth content in the chemical compositions of 20CdO . xB i2O3 . (79.5-x)B2O3, where x = 15, 20, 25, 30 and 35 mol % Bi2O3, containing 0.5 mol% o f Cu 2+ ions. These glasses have been prepared by melt-quench technique (1150°C in air)…
It is now acknowledged that for many solid dielectrics below a threshold electrical stress, electrical aging can either be neglected or considered to progress very slowly. Hence, it is recommended to exclude from life prediction data obtained at high electrical fields. In general, it is common to be faced with an insu…
We report on the design, construction, and operation of a horizontal field, 30 T magnet system with a conical bore optimized for synchrotron x-ray powder diffraction. The magnet offers ±31° optical access downstream of the sample, which allows to measure a sufficiently large number of Debye rings for an accurate cryst…
The effect of composition on nickel cobaltites prepared by co-precipitation was investigated. Various compositions were synthesised under different heat treatment conditions. The formation mechanism, lattice parameter and crystallite size were determined by various techniques. X-ray dffraction (XRD) analysis revealed…
During the investigation, a quaternary blended fabric was prepared and also studied their utility and mechanical properties. Under these properties Weight per Unit Area, Crease Recovery, Abrasion Resistance, Pilling, Water Absorbency, Water-Vapor - Permeability, Drapeability, Stiffness properties were assessed. The pl…
Energy transfer between two optical centers has long been used to promote the down- and up-conversion of light. In conventional phosphors, the two centers are distributed uniformly in 3D space and the luminescence efficiency is generally limited by energy transfer to defect states, where the excitation is quenched thr…
Abstract An intensive research work was carried out in the frame of a RFCS (Research Found for Coal and Steel) project, to investigate the influence of different deep cryogenic treatments (DCT) on hardness, strength, toughness and wear resistance of AISI M2. Short and a long classical DCT, providing the soaking at tem…
The structure of the catalyst used in a passive autocatalytic recombiner (PAR) is crucial for making the PAR reliably functional in environments of high humidity and for concentrations of hydrogen above 8 to 10 vol %. The temperature of the catalyst has to be kept below 500°C to avoid the autoignition of hydrogen. A n…