Materials Literature
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The optical characteristics of quartz glass are studied in the bulk and on the surface by the method of differential Fourier transform IR reflection spectroscopy. Tabular values of the optical constants that characterize the bulk properties of quartz glass in the range 3.5–2000 µm are obtained. Particular features of…
Effects of thermal aging on physico–chemical and electrical properties of polymethyl methacrylate (PMMA) are reported in this paper. PMMA samples are submitted to successive heat–cooling cycles (Tmin=20 ∘C and Tmax=90 ∘C) in the ambient air, each cycle lasts 12h. Different techniques are thus employed to investigate s…
The p-ZnO/n-ZnSe heterojunction was prepared by the photothermal oxidation of ZnSe substrate. Currentvoltage characteristics are measured and discussed. The potential barrier height is equal to 3 eV at 300 K and its anomalous temperature coefficient reported here is due to the high defects concentration ( 10 14 cm -2…
The influence of the grain size on the dislocation interaction mechanisms that control the deformation of aluminum in the temperature range 4.2–295K is studied. For this, samples of coarse-grain (CG) and ultrafine-grain (UFG) aluminum obtained by equi-channel angular pressing were deformed by stretching at constant ra…
Abstract A model based on grain/interphase boundary sliding controlled flow that develops to a mesoscopic scale (defined to be equal to or more than a grain diameter) has been used to understand superplasticity in micrometer- and sub-micrometer grained intermetallics. The procedure for analyzing the experimental stres…
The INE-Beamline for actinide research at the synchrotron source ANKA is operated by the Institut für Nukleare Entsorgung (INE) at the Forschungszentrum Karlsruhe. Experiments on radioactive samples with activities up to 10 6 times the limit of exemption inside a safe and flexible double containment concept are possib…
Electron beam exposure is the tool of choice for highest resolution lithography but suffers from the low throughput during serial beam writing [T. Ito and S. Okazaki, Nature (London) 406, 1027 (2000); R. F. Pease and S. Y. Chou, Proc. IEEE 96, 248 (2008)]. The authors designed and developed a low-cost self-powered nea…
A new species of ‘fragilarioid’ diatom belonging to the genus Punctastriata Williams & Round is described from Lake Glubokoe (Moscow Area, Russia). P. glubokoensis sp. nov. shares particular features of the genus Punctastriata: multiseriate striae, lack of rimo-portulae, presence of a single apical pore field and a si…
The determination accuracy of the parameters of multilayer structures during their in situ ellipsometric monitoring is analyzed. A qualitative criterion is proposed that makes it possible to evaluate the validity of replacement of the multilayer structure by a certain medium with effective optical constants. According…
This paper deals with the microwave study of coplanar tunable capacitors using Mn-doped Ba(0.6)Sr(0.4)TiO(3) ceramics. These ceramics are developed to improve performance at microwave frequencies (i.e., compromise between tuning capabilities and insertion losses). Interdigitated capacitors were first fabricated on thi…
A batch foaming process has been employed to obtain microcellular materials from polystyrene plus a SBM copolymer (polystyrene-co-1,4-polybutadiene-co-poly(methyl methacrylate). In the first part of the process, raw materials were mixed and extruded in a proportion 90:10 to obtain the precursor materials, leading to a…
Magnesium resources in salt lakes in China are of high grade , large reserves and easy exploitation. However , their utilization is lagged behind , affecting the sustainable exploitation and comprehensive utilization of other resources in salt lakes to some extent . In this paper , by considering the characteristics o…
Carbon nanosheets have previously been shown to be promising high current field emission cathodes for a variety of potential applications. The vertically oriented planar sp2 carbon nanosheets grown by rf plasma-enhanced chemical vapor deposition terminate with one to seven graphene sheets and grow to ∼1 μm in height.…
Er 3+ doped Y 2 O 3 nanoparticles were synthesized by enzymatic and polymer-assisted homogeneous co-precipitation methods. Resultant particle size is about 30–40 nm with narrow size distribution whereas the particle size is smaller than those acquired by conventional homogeneous and alkali precipitation methods. The p…
In situ and real time control of the different process steps in semiconductor device manufacturing becomes a critical challenge, especially for the lithography and plasma etching processes. Dynamic scatterometry is among the few solutions able to meet the requirement for in line monitoring. In this article, the author…
Changes in the charge of adatoms and the substrate work function have been calculated for the adsorption layers of sodium and cesium on graphite using the Anderson-Newns model. The results of calculations are in good agreement with the available experimental data. It is established that there is electron transfer from…
We investigated the change in structures during reduction and oxidation of a new type of Pd on Sr-Fe-O catalyst for exhaust emission. In situ DXAFS techniques have shown changes in palladium states and oxygen concentration simultaneously during reduction and oxidation reactions. Quantitative analysis has shown that pa…
By first-principles density functional calculations with generalized gradient approximation ZnO:Co (101¯0) thin films have been demonstrated not to exhibit a ferromagnetic behavior in the absence of any additional carrier doping. Virtual crystal approximation is employed to introduce controlled hole concentrations by…
Monte Carlo simulation of electron transport through a silicon nanocrystal array is performed to clarify the mechanism of high-energy electron emission from a porous silicon diode. The electronic states are calculated within an empirical tight-binding approximation. In the Monte Carlo simulation, optical-phonon emissi…
The electro-optical proprieties of Polymer Dispersed Liquid Crystal (PDLC) films were studied to understand the relationship between the conditions of preparation, the morphology, and the response to an external electrical field. The PDLC films were obtained by polymerization induced phase separation (PIPS) process us…