Materials Literature
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The conventional ultimate performance test by applying a component in its true application (i.e., in an engine) is often very expensive and impractical when dealing with developmental materials. Simpler, less expensive, and more practical test methods must be utilized. The present work aims toward the applications of…
We report the observation of 1∕f noise in carbon nanotube field-effect transistors as a function of gate potential. In order to avoid additional low frequency noise contribution from SiO2-nanotube interactions, the measurements were carried out in conducting liquid. Based on the experimental results, we conclude that…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Raghavendra Devendra, Savvas G. Hatzikiriakos, Roland Vogel; Rheology of metallocene polyethylene…
The magnetic behaviour of nanocrystalline ferrite is compared with the diluted dispersion systems containing 10–40 wt-% nickel ferrite in a polyethylene matrix. The zero field cooled (ZFC)/field cooled (FC) magnetic measurements [ M( T)] and M( H) measurements suggest strong evidence of interparticle interaction (dipo…
Abstract We carried out a theoretical study of the rutile TiO 2 (110) surface using ab initio techniques. We investigate the effects of both surface and subsurface defects. These defects consist of a missing oxygen atom in the crystalline structure, the oxygen vacancy. We show that the defect formation energy of oxyge…
In the late 1980’s and early 1990’s, various media in karst environments in the Northern Yukon Territory were examined for their diatom content. Cryogenic cave calcite powders, grus and various ice formations (ice plugs, ice stalagmites and floor ice) were collected from three freezing caves and one slope cave to make…
Temperature dependences of the magnetization and thermal expansion coefficient of the Fe-36% Ni invar alloy in different structural states obtained upon plastic deformation by torsion under a quasihydrostatic pressure followed by annealing at different temperatures are studied. A decrease in the thermal expansion coef…
Abstract Three kinds of MgC 2 O 4 ·2H 2 O were prepared by the precipitation method with different raw materials, and MgO with high surface area was obtained via thermal decomposition of MgC 2 O 4 ·2H 2 O in different atmospheres. The precursor MgC 2 O 4 ·2H 2 O and as-prepared MgO were characterized by XRD, BET, TEM,…
For a long time in the Russian Federation the computer code for analysis of severe accidents is being developed. The main peculiarity of this code from the known computer codes for analysis of severe accidents at NPP such as MELCOR and ASTEC, is a consequent realization of the mechanistic approach for modeling of the…
Biologically relevant nitrogen-containing heterocycles were photo-protected using an NPOM caging group that is stable under physiological conditions but readily decages under irradiation with non-photodamaging UV light.
A direct transformation from the g-BC1.6 phase to a diamondlike BC1.6 phase was obtained in a diamond-anvil cell at high temperature, 2230±140K, and high pressure, 45GPa. Such a transition has not been observed in the B–C system before. The recovered samples were examined using both synchrotron-based x-ray diffraction…
Crystalline zinc oxide nanoparticles have been prepared by mixing aqueous solutions of zinc nitrate and hexamethylenetetramine (HMT) at 60°C and 80°C. Transmission electron microscopy and X‐ray diffraction show that the ZnO nanoparticles of diameters ranging from 15–33 nm and 25–43 nm long are formed. Aspect ratio is…
We report in this paper our studies on the photoconductivity and photovoltaic effects of colloidal PbSe nanocrystal quantum dots (NQDs) which were embedded in conductive polymer matrices to form hybrid polymer/NQD infrared photodiodes. The generation of photocarriers in PbSe NQDs and their transport in NQD-polymer com…
Nearly 12.5 million new cancer cases are diagnosed worldwide each year. Although new treatments have been developed, most new anticancer drugs that are effective outside the brain have failed in clinical trials against brain tumours, in part due to poor penetration across the blood-brain barrier and the blood-brain tu…
The refractive indices n e and n o , of two nematic mixtures: ZLI 2141-000 and ZLI 2452 have been measured in the temperature range 291-391 K using 589 nm light source. A slight modification to the four-parameter model given in Li J et al., J Appl Phys, 96 (2004) 19, is made to carry out the analysis of the data. The…
A new method of analysis of differences in the surface free energy (SFE) values of a solid, calculated using the methods of Owens-Wendt (OW) and Neumann and two measuring liquids, water and diiodomethane, is presented. The concept of the analysis bases on the differences in SFE, which occur objectively and regardless…
Ba 3 Cu 14 - δ Te 12 was prepared by directly reacting the elements in stoichiometric ratios at 800 °C for 3 days, followed by slow cooling. Ba 3 Cu 14 - δ Te 12 forms a new structure type, space group P 2 1 / m, with lattice dimensions of a = 11.909(2) Å, b = 21.174(4) Å, c = 11.983(2) Å, β = 117.071(4)°, and V = 269…
C f /SiC composite was brazed to Ti alloy using interlayer of Ag–Cu–Ti–W mixed powder. The effects of W content and brazing parameters on the microstructure and properties of the brazed joints were investigated. The results show that W grains mainly distribute in Ag phase in the brazing layer and provide the effects o…
We present the results of our all-electron density-functional calculations on the magnetic anisotropy of the [Fe4(sap)4(MeOH)4] and [Fe4(sae)4(MeOH)4] polynuclear complexes. Our calculations, which predict that only the second complex is a single-molecule magnet (with a magnetic anisotropy energy barrier of 5.6 K), ar…
Intergranular embrittlement due to grain boundary segregation of phosphorus is recognized as one of the potential degradation factors in irradiated reactor low alloy steels at high neutron fluence. In this study, low alloy steels thermally aged at 400-500°C were investigated to evaluate the correlation between phospho…