Materials Literature
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Effect of high electric fields on the conductivity of 0.5-1-µm-thick layers of a chalcogenide glassy semiconductor with a composition Ge2Sb2Te5, used in phase memory cells, has been studied. It was found that two dependences are observed in high fields: dependence of the current I on the voltage U, of the type I ∝ U n…
Composite or 3 polymeric insulators with a lot of advantages over ceramic (porcelain or glass insulators) have been in use since last 15 years. Before they are readily adopted as future insulators, a lot of work on their life estimation is required. The reason is their organic nature which causes the degradation of th…
The clay phyllosilicate mineral montmorillonite, which is composed of 1-nm lamellar crystals (lamellas), attracts more and more attention due to its significant role in many industrial applications, such as petroleum and civil engineering, the food and cosmetic industry, heterogeneous catalysis, waste storage (includi…
The methods for intensifying the process for the synthesis of carbon nanomaterials by means of a physicomechanical effect on catalysts have been studied. The influence of an alternating electromagnetic field and ultrasound on the activity of catalysts has been investigated. A technology for producing activated nickel-…
Sliding friction of materials differing in their deformation hardenability is simulated using a modified macroscopic model which allows taking into account of frictional heating, as well as additional heat generation in the material surface layer due to its plastic deformation. Taking into consideration additional hea…
Capability of multiwalled carbon nanotubes (CNTs) to create in-depth gradients in properties and functionalities of conventional materials has been investigated for the first time. Functionally graded material (FGM) concept has also been employed for the first time to bridge conventional materials to their advanced na…
The rate of dissolution of aluminum and qualitative properties (gloss and uniformity) of its surface were examined as influenced by the concentration of H 3 PO 4 and fluorine-containing compounds and their nature, as well as by the temperature, pH, and various additions (acids, surfactants, inhibitors).
HFCBGA is a thermally enhanced FCBGA with its heat spreader extending heat conduction area by connecting itself to the rear side of the silicon die. A thermal interface material plays an important role as a heat conduction path. The thermal performance should be checked not only at time zero, several types of reliabil…
Abstract Two new polyoxypregnane glycosides, marsdenosides L and M ( 1 and 2 , resp.), along with five known polyoxypregnane glycosides, 3 – 7 , were isolated from the stem of Marsdenia tenacissima ( Roxb .) Wight et Arn . (Asclepiadaceae). The structures and relative configurations of the new compounds were elucidate…
Cr-doped AlN films are prepared by reactive dc magnetron cosputtering under a negative substrate bias ranging from 50 to 110 V. The bias induces variation of the texture from (002) to (110) orientation, enhances the stress and reduces the grain size in the films. All of the samples are ferromagnetic. The atomic magnet…
The fine structure of a hexagonal zinc oxide crystal doped with nickel ions of the composition Zn1 − x Ni x O has been studied using neutron diffraction and magnetic measurements. It is established that even at very low doping levels (x = 0.0004), the crystal undergoes local distortions in basal planes of the initial…
BACKGROUND: Nephrogenic systemic fibrosis is a sclerodermalike disease in patients with acute or chronic renal insuffiency related to administration of gadolinium-containing contrast agents. Previous studies have demonstrated clonal T-cell populations in the blood of patients with systemic sclerosis, suggesting that t…
In this paper is analyzing the current operating conditions of one of electric arc furnace (EAF) in order to evaluate the best option to solve the energy consumption problem. Also we evaluate existing process' equipment performance and point to improvement opportunities. Recommendations for the best operating set-poin…
Scientists can now manipulate the state of polarization across a laser beam at the wavelength scale. Such engineering allows for optimal plasmonic focusing that could be translated into efficient coupling for plasmonic circuits, high-resolution imaging, biochemical sensing and thin-film characterization.
New compounds Pb 4 La(GeO 4 ) 2 (VO 4 )(I) and Sr 5 La 5 (GeO 4 ) 5 (VO 4 )O(II) were prepared and identified. Compound I has the structure of apatite, a = 10.108(1) Å, c = 7.369(1) Å, V = 652.1(2) Å 3 . Compound II has the structure of oxyapatite, a = 9.9028(5) Å, c = 7.3162(4) Å, V = 621.34(6) Å 3 .
This mini review presents our recent developments in porphyrin-modified electrodes for solar energy conversion. Various porphyrins have been assembled on nanostructured semiconducting electrodes to achieve efficient photocurrent generation. First, porphyrins have been organized with fullerenes onto semiconducting elec…
Eu 3+ doped silica films have been prepared by sol–gel method and employed as luminescent down-shifting layer on the front side of a crystalline Si solar cell to improve their conversion efficiency. Measurements under standard test conditions (AM1.5, 100 mW/cm 2 ) show the conversion efficiency of Si solar cell with s…
Natural weathering of hornblende from the Tallulah Falls Formation (Georgia, U.S.A.) takes place under thoroughly leached, oxidizing conditions. At the earliest stage of weathering, corrosion of hornblende forms denticulated terminations, with only minimal porosity apparent within the partially pseudomorphic kaolin-gr…
Pure and 10 mol% Fe 3+ doped CeO2 nanocrystals were synthesized by hydrothermal method using two different basic solutions (NH4OH and NaOH). All the samples were calcinated at 140 C and 200 C. The characterization of crystalline structure, vibrational and optical properties was performed using X-ray diffraction, Raman…
Carbon nanotubes have revolutionalized various areas of science and technology. Conceptually, carbon nanotubes can be thought of as all sp2 carbons arranged in graphene sheets, which have been rolled up to form a seamless hollow tube. The tubes can be capped at the ends by a fullerene type hemisphere and can have leng…