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。
A novel AlGaN/GaN high electric mobility transistor (HEMT) with polyimide (PI)/chromium (Cr) as the passivation layer is proposed for enhancing breakdown voltage and its DC performance is also investigated. The Cr nanoparticles firstly introduced in PI thin films by the co-evaporation can be used to increase the permi…
Resonant magnetic reflectivity is a powerful technique for the study of magnetic heterostructures enabling the chemical and magnetic profile to be determined with element specificity and spatial resolution of better than 1 nm. A model for describing interface roughness in thin layers is presented which can be implemen…
Specific features of the topography of friction tracks formed during the sliding of a WCo6 ball over an austenitic nitrous coating at various velocities of sliding under various loads using the ball-on-disc arrangement are studied and compared with those for the WCo6 ball-110Mn13 steel pair. It has been found that the…
Mg2Si1−x Ge x (0 ≤ x ≤ 1) solid solutions have been successfully prepared by using a solid-state reaction and hot pressing. The electrical conduction changed from n-type to p-type at room temperature when x ≥ 0.7 due to the intrinsic properties of Mg2Ge. For all specimens, the electrical conductivity increased and the…
Modern aircraft communication systems are required to operate over a wide range of different frequency bands. Communication services can lead to the requirement for more than 15 different antenna structures. Modern examples of such antenna structures include blade antennas. Typically these antennas are mounted perpend…
Understanding the mechanical properties of nanoscale systems requires new experimental and theoretical tools. In particular, force sensors compatible with nanomechanical testing experiments and with sensitivity in the nN range are required. Here, we report the development and testing of a tuning-fork-based force senso…
Abstract The Bi-Cu-Ni ternary system belongs to the group of potential Cu-Ni-based advanced lead-free solder materials for high temperature application. In this study microstructure investigation of the slow-cooled Bi-Cu-Ni samples was done using SEM-EDS analysis. The samples compositions were chosen along three cross…
Lightning is a natural phenomenon caused by an atmospheric electrical discharge, and lightning strikes are of hierarchical structure. Similar phenomenon is first observed in a charged jet in the presence of a high electrostatic field, the process is widely adopted for fabrication of superfine fibers, and its mechanism…
The hydroxyapatite (HA)/ TiO2composite ceramic coatings were formed by micro-arc oxidation (MAO) on pure titanium in mixed electrolyte of calcium glycerophosphate and calcium acetate with DC pulse power. Microstructure, phase composition, porosity and thickness of the coatings were examined using SEM, XRD, Image-Pro P…
A new triclinic modification of lead iodate Pb(IO3)2 (space group $C\bar 1$ ) is obtained under hydrothermal conditions. The crystal structure is determined without preliminary knowledge of the chemical formula. [IO3]− groups, which are characteristic of pentavalent iodine, have a typical umbrella-like configuration.…
The possibility of removal of oxygen and magnesium from the products of the magnesium reduction of tantalum pentoxide under self-propagating high-temperature synthesis conditions that contain 30 wt % Mg 4 Ta 2 O 9 is studied. Additional reduction of this material can decrease the magnesium content to <0.01%. The oxyge…
Abstract The paper presents the summary of research on polymer melt particle motion trajectories in a disc zone of a screw-disk extruder. We analysed two models of its structure, different in levels of taken simplifications. The analysis includes computer simulations of material particle flow and results of experiment…
Behavior of physiologically active compound, bis(hydrazinocarbonylmethyl) sulfoxide, in aqueous solution has been studied by means of potentiometry, spectrophotometry, and mathematical simulation. Protolytic properties of bis(hydrazinocarbonylmethyl) sulfoxide have been described, and the formation of sodium salt has…
The metastable garnet lattice of Gd3Al5O12(GdAG) was effectively stabilized via doping with significantly smaller Lu3+, and based on which (Gd,Lu)AG:Yb/Ho was developed in this work as a new type of upconversion phosphor. The phosphor particles calcined from the precursors synthesized via carbonate precipitation were…
The mass distribution of emitted V n O − and Nb n O − clusters and their unimolecular decay by all stoichiometrically possible fragmentation channels, which takes place under the sputtering of niobium and vanadium surfaces and blowing by oxygen, are studied. It is shown that the formation, excitation, and unimolecular…
For permanent magnet linear motors (PMLMs), large temperature rise can damage their performance and limit their output. Water-cooling system can be designed to reduce temperature rise and to improve thrust density. In order to study the thermal performance of a water-cooled, 14-pole, 12-slot PMLM, the finite element m…
The objective of this work is to fabricate and study multilayer “composite-on-insulator” sensor structures based on porous silicon and nonstoichiometric tin oxide. Two-layer structures “macroporous silicon-mesoporous silicon” on single-crystal silicon with sharp geometrical boundaries are grown. Test “composite-on-ins…
Optimization principles are proposed for composing additives to mesogenic compounds of LCA used for metal working structural steels. The considered additives were found to positively affect the drilling process. The problems of their use in practice are discussed.
Recently, the technology of membrane is developed directly. Many attractive things of membrane is able to be studied, therefore many ideas emerged on the aspect of synthetic membrane fabrication from many materials, furthermore it is able to used substituting for the function of natural membrane. The purpose of this s…
Vector magnetic properties and two-dimensional magnetostrictions of electrical steel sheets under alternating and rotating magnetic flux conditions were measured. Based on the measured database, magnetic characteristic analyses of motor and transformer model cores have been carried out and distributions of two-dimensi…