Materials Literature
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In ball rolling, the metal is deformed in rollers with helical grooves. Accordingly, the deformation zone may be dividing into the shaping section, where the blank is captured and rolled and the ball is formed, and the finishing section, where the ball is smoothed, its final dimensions are attained, and the links betw…
Bipolar resistive switching memory (RRAM) relies on ion migration effects taking place at a conductive filament (CF). Understanding the evolution of the CF during set and reset transitions is essential for predicting RRAM scalability and for developing new methods for storage and computation. This work describes the e…
The effect of annealing temperature on the micro and the crystal structures and the ferroelectric properties of poly(vinylidene fluoride/trifluoro ethylene)(P(VDF/TrFE)) thin films was investigated. The X-ray diffraction results indicated that the crystallization of the film was enhanced at an annealing temperature ab…
A modified scheme of the discrete sources method has been applied to investigate the strong interaction between proximal noble metal nanoparticles. The new scheme enables calculation of a near-field enhancement of several orders with a high degree of accuracy. The total field enhancement in between two spheroidal part…
The structures of 2-diphenylphosphoryl-1-diphenylphosphorylmethoxy-4-ethylbenzene (L), its adduct with water and nitric acid, and the complex [(L) 2 Nd(η 2 -O 2 NO) 2 ](NO 3 ) · NO 3 · 2C 6 H 6 were determined by X-ray diffraction. The above compounds were isolated under conditions very similar to those used for extra…
Recently fabricated single-crystalline atomically flat metallic nanofilms are in fact quantum-engineered multiband superconductors. Here the multiband structure is dictated by the nanofilm thickness through the size quantization of the electron motion perpendicular to the nanofilm. This opens the unique possibility to…
We calculate a topological invariant, whose value would coincide with the Chern number in the case of integer quantum Hall effect, for fractional quantum Hall states. In the case of Abelian fractional quantum Hall states, this invariant is shown to be equal to the trace of the K -matrix. In the case of non-Abelian fra…
Necessity is the mother of invention".This necessity has made human now to stand at the verge of science.Nano technology is termed as application of science and technology at the nano level.From the many conditions which can do harm to the human body, one of the most fundamental and fast acting is a lack of perfusion…
Mesoporous SnO2/C composites are prepared by a facile microemulsion method at ambient temperature followed by calcination under N2 at 600 oC for 2 h. The microstructure and morphology of the samples were characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscop…
Heptamethyl cobyrinate was transformed into hexamethyl 8-nor-cobyrinate. The crucial step involved the synthesis of new, vitamin B12 derived cobryketone via palladium-catalyzed cleavage of the sp(3)-sp(3) carbon-carbon bond with the liberation of the ketone. The replacement of sp(3) carbon atom with sp(2) (C═O) at the…
A promising method that offers both time- and site-specific delivery of macromolecules is photochemical internalization technology (PCI). Here, we have characterized various polyamidoamine (PAMAM) carriers [generation (G) 0-7], for light-directed delivery of nucleic acids in vitro by the use of PCI technology. A numbe…
Zinc stearate additions have been used to increase the remanence of sintered Nd-Fe-B magnets produced by the powder metallurgy without powder pressing. Zinc stearate acts as an internal lubricant, i.e., it decreases the friction forces between the particles and favors an increase in the degree of texture of the powder…
The amorphous nickel–phosphorus coating and its carbon nanotube (CNT) composite coating were prepared by brush electroplating technology. After 1 h heat treatment at 400°C, the coatings translated into the crystalline state, which consists of α-Ni matrix and Ni3P precipitated phase. The results of energy dispersive X-…
In contacts normal metal–superconductor Bi1.6Pb0.4Sr1.8Ca2.2Cu3O10 (Bi2223), the energy gap Δ(T) of the superconductor and the excess current Iexc(T) were measured by means of the Andreev spectroscopy. It is shown that the parameter Δ(T) turns to zero at the superconducting transition temperature of the cuprate, Tc ≈…
• The premature failure of thermowells was attributed to fatigue damage encouraged by improper selection of thermowell configuration. • High flow velocity of the pipeline medium increased the wake frequency above the natural frequency of the used straight type thermowell. • This in turn resulted in a resonance conditi…
To investigate whether one-dimensional pinning centers can attain the isotropic critical current density$(J_{\rm c})$properties, columnar defects (CDs) crossing at widespread angles were installed by heavy-ion irradiation into YBCO thin films. For the sample containing the CDs crossing at 0$^{\circ}$,$\pm 30^{\circ}$,…
Ti-Ti and Ti-NiAl joints were obtained by thermal explosion in the Ti-Ni-Al system. The bulk Ti samples used as a substrate were preliminary coated with mechanically activated Ni-Al powders by the method of mechanical cold working. The Ti-Ti joints were found to have the Ni x Al y Ti z composition and lower porosity c…
Metal organic frameworks (MOFs) are considered as most promising candidate for hydrogen storage material for practical application. MIL-53(Cr) MOFs were synthesized from Cr(NO3)3 x 9H2O combined with terephthalic acid organic linker. MIL-53(Cr) MOFs are octahedral in shape and the particle size was around 10 microm id…
The process of filling targets with D-T for cryogenic experiments on the OMEGA laser induces small-scale features on the inner surface of the plastic capsules. Each feature was a cluster of low-level domes (<0.1 μm high) with individual lateral dimensions <5 μm that collectively covered lateral dimensions of up to 300…
The subject-matter of the paper covers a very topical problem of possible restriction of shortcomings like poor knocking-out properties of castings and hard reclaimability of this type sandmixes by proper selecting their components and using innovative microwave heating. It was proved that the sandmixes subject to qui…