Electric field tuning of the dielectric response of strontium titanate in the THz range
We present experimental results evidencing tuning of permittivity by applied electric field in strontium titanate.
Materials Literature
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Penn State researchers use corn waste to generate electricity
Researchers at Pennsylvania State University have developed a way of generating electricity from corn waste.
Principles of radiation protection of poly(methyl methacrylate)
Mechanisms of radiation aging of poly(methyl methacrylate) and methods for enhancing its resistance to high-energy radiation are considered.
Effect of the paste molding pressure on the mechanical strength of an iron oxide catalyst in the dehydrogenation of methylbutenes
The effect of the paste molding pressure on the physicomechanical and texture characteristics of catalysts was studied. An indirect criterion is suggested to evaluate the molding pressure in industrial extruders, whose optimal value ensures good physicomechanical properties of the catalysts and kinetic control over th…
Multiwall carbon nanotubes-based composites – mechanical characterization using the nanoindentation technique
Abstract We report on mechanical properties of multiwall carbon nanotubes (MWNTs)-polymer composites using the nanoindentation technique. The nanoindentation experiments conducted on thin films containing MWNTs revealed that the presence of nanotubes does not affect the nanomechanical properties of the composites. Eve…
Thin Film Ba0.25 Sr0.75 TiO3 Varactors on Au Bottom Electrode for Microwave Applications
Thin film Au/Pt/Ba0.25Sr0.75TiO3/Au/Ti varactors were fabricated on fused silica substrates using pulsed laser deposition of the ferroelectric films. Deposition temperature was optimized to improve varactor tuneability and loss tangent. The varactors were characterized in the frequency range 1-25 GHz at different dc b…
Dielectric Properties of Na0.5Bi0.5TiO3-PbZrO3 Ceramics
The structural and dielectric properties of Na0.5Bi0.5TiO3-PbZrO3 ceramics were studied by X-ray diffraction and impedance spectroscopy. We found formation of a continuous solid solution between the two end members. The corresponding crystal-symmetries and the lattice parameters were determined. The evolution of the d…
Magnetic nanocomposite thin films prepared by sol-gel process
Cobalt ferrite composite thin films, CoFe2O4/SiO2, were prepared by sol-gel process, using tetraethylorthosilicate (TEOS) as a precursor for silica, and metallic nitrates as precursors for ferrite. The obtained dip-coated films thermally treated at 550, 750, and 950 ºC were transparent, homogeneous and adherent. Their…
An atomistic analysis of incipient metal plasticity during tensile loading
Crystallographic slip at the beginning stages of plastic deformation is investigated via an atomistic (molecular statics) model. Attention is devoted to face-center-cubic metallic crystals in the form of a nanowire under uniaxial tensile loading. The simulation parameters employed in this work are such that dislocatio…
Nonempirical cluster calculations of the electric field gradient tensor in yttrium-aluminum garnet Y3Al5O12
The electric field gradient (EFG) tensor at the aluminum nucleus sites in yttrium-aluminum garnet Y 3 Al 5 O 12 is calculated using the Hartree-Fock method and the nonempirical cluster approach. It is shown that the EFG tensor at the Al tetr sites is described well taking into account the nearest neighbors (an [AlO 4…
All optical read‐out radiation dosimeter using CVD synthetic diamond
Abstract In the present work, we evaluate the optically stimulated luminescence (OSL) dosimetric properties of two polycrystalline 10 μm thick films, undoped and 750 ppm nitrogen doped, grown on (100) silicon substrates exposed to beta radiation. The samples were optically stimulated to free and to induce radiative re…
Peculiarity of Aluminium Anodization in Malonic Acid Solution
Rate and efficiency of electrochemical aluminium anodization as well as volumetric growth of porous anodic alumina in malonic acid solution are experimentally determined
Progress of IV-VI Semiconductor Research in China
Progress of IV-VI semiconductor (lead chalcogenides) research in China is reported. Lead chalcogenides (PbSe and PbTe) have been grown by molecular beam epitaxy (MBE). Evolution of PbSe surface morphologies with different Se/PbSe beam flux ratio has been studied by atomic force microscopy (AFM) and high-resolution x-r…
Peculiarity of Aluminium Anodization in Sulphosalicylic Acid Solutions
Rate and efficiency of electrochemical aluminum anodization as well as volumetric growth of porous anodic alumina in 0.6 and 1.0M sulphosalicylic acid solutions are experimentally determined
Activation of the carbon component of shungite-III and the sorption capacity of the material for hydrogen
The carbon material MNS, produced from shungite-III by successive alkaline and acid treatment, was studied. Cavitational treatment of an aqueous dispersion of the MNS material in the field of a standing acoustic wave converts a part of the substance into a material with a developed surface and a sorption capacity for…
Cloning of D-glucose dehydrogenase with a narrow substrate specificity fromBacillus thuringiensis M15
We have cloned an ORF of Bacillus thuringiensis M15, which encodes a protein sharing high similarity with D-glucose dehydrogenase. A high-expression plasmid (pBtGDH) for the ORF was constructed. Escherichia coli JM 109 transformed with pBtGDH exhibited D-glucose dehydrogenase activity, and the enzyme was purified by 3…
Eggs fertility and biological aspects of the life cycle in natural populations of Simulium (Diptera, Simuliidae)
Eggs fertility rate and some biological aspects of the immature forms were studied on six Simulium species from ovipositions collected in natural breeding places located in rural area. The fertility was considerably high. For a total of 213 ovipositions containing 74,906 eggs, the average fertility rate was 99.13% wit…
Effect of Hydrostatic Pressure on the Dielectric Properties of PMN-0.31PT Single Crystal
[Pb(Mg 1/3 Nb 2/3 )O 3 ] 0.69 (PbTiO 3 ) 0.31 single crystal of composition close to the morphotropic phase boundary has been studied by dielectric spectroscopy in the frequency range of 1–1000 kHz under hydrostatic pressure (p) up to 0.6 GPa. At ambient pressure two successive phase transitions have been observed: th…
Geometry and the nonlinear elasticity of defects in smectic liquid crystals
Rotation invariance imposes nonlinearities in the elastic strain of smectic liquid crystals. Though often neglected, in smectic liquid crystals these nonlinearities can generate new qualitative behavior, especially in the presence of defects such as dislocations. By exploiting geometry, I describe exact results on edg…
Texture evolution of Terfenol-D by solidification in a magnetic field
The orientation of crystals of the giant magnetostrictive compound Terfenol-D solidified in a static magnetic field has been investigated. When the melt with size ϕ16×18mm2 solidifies slowly in a static magnetic field of 140mT, texture of the samples appears and the easy magnetization axis of the polycrystal tends to…