Materials Literature
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A correlation between melting points and Grüneisen lattice constants was found for a number of glass-forming oxides. It was established that, at the melting point, the mean energy of the thermal motion of a kinetic unit equaled the ultimate strain work of the interatomic bond corresponding to the quasi-elastic force m…
To improve the stability of fine copper powder, it was pretreated by benzotriazole first. Then ammonium persulfate was dripped into treated powder/aniline suspension to produce polyaniline/copper composite. Detected by field emission scanning electron microscope, transmission electron microscope, X-ray diffractometer…
Abstract The foam index test can be useful for predicting air-entraining admixture (AEA) dosage in concrete or for evaluating AEA interaction with other mixture ingredients. The test is sensitive to several factors including total water content, water-cementitious materials ratio, ash-cementitious materials ratio, and…
A modal solution for the problem of scattering by multi-wall carbon nanotubes was developed using an effective-boundary condition approach. The solution can be used to study the electrodynamics of arbitrary carbon nanotube structures with any source excitation. A numerical example of simple MWCNT was given and compare…
The information of band structure of silicon nanocrystal (nc-Si) embedded in SiO2 thin films synthesized by Si ion implantation and subsequent thermal annealing at various temperatures has been obtained from spectroscopy ellipsometric (SE) analysis. The indirect band structure and the energy gap of the nc-Si are not a…
Six nine purity graphite and single-walled carbon nanotube (SWCNT), double-walled carbon nanotube (DWCNT), multiple-walled carbon nanotube (MWCNT) are mass analyzed by the scanning atom probe. Surface atoms well exposed to the external field are field evaporated and individual evaporated fragment ions are detected. Ea…
In article the new construction of the multiple-unit piezoelectric transducer with the increased output power and a disk radiator, which has a refined thermal mode is offered. The designing procedure of bending vibration disk radiators is described. The developed constructions are implemented; their technical characte…
Abstract Crystals of thallium dihydrogendiphosphate Tl2 Me(H2P2O7)2 · 2 H2O (Me = Mg (1), Mn (2), Co (3), Ni (4) and Zn (5)), have been synthesized and analyzed by powder X-ray diffractometry (Mg phase) and single crystal X-ray diffractometry (other phases). They resulted to be isostructural within triclinic group P-1…
The adsorption of CO on polycrystalline ZnO powder samples was investigated as a function of the pretreatment by applying static adsorption microcalorimetry and temperature-programmed desorption (TPD). Mainly weak adsorption sites were found to be present on the exposed ZnO surfaces but also a minor amount of highly a…
The influence of electrothermal feedback and hysteresis on the operation conditions, noise, and performance of a VO2 transition-edge microbolometer has been evaluated. The material undergoes a first-order semiconductor-to-metal phase transition (SMT) within the temperature range 40<T<70 °C. Due to electrothermal feedb…
On the basis of the RF characteristics of p-type diamond field-effect transistors (FETs) with hydrogen surface termination, we establish an equivalent circuit (EQC) model. From comparisons of three cases we reveal that to represent the device performance in the EQC, the source, gate, and drain resistance should be con…
We have investigated microscopic structures of sputter and pulsed laser deposited (PLD) anatase Nb-doped TiO2 transparent conducting films, and discuss what causes the degradation of resistivity in sputter-deposited films. Cross-sectional transmission electron microscope and polarized optical microscope images show in…
Studies of the local activation of iron-cementite nanocomposites (NC) revealed the step-wise increase in their resistance to pitting with an increase in the Fe 3 C Content (∼50 mass %) or with the formation of an ordered cementite network structure. The corrosion process is determined by the chemical state of carbon,…
Refraction of an electromagnetic wave from a point source to a medium with a negative refractive index is considered. An electric Hertz dipole that is located in air and directed parallel to a plane interface is considered as the point source. It is rigorously shown that the electromagnetic radiation propagated from t…
Abstract A series of deposits formed by single‐walled carbon nanotube (SWNT) bundles coated by nanocrystalline diamond (NCD) are produced using a modified CVD reactor. The nanocylindrical structures are deposited on Si substrates using carbon nanopowders and atomic H as reactants. The nanocrystalline coating obtained…
The viscoelastic properties of sequential semi-interpenetrating polymer networks prepared via the swelling of network polyurethane in different monomers (butyl methacrylate, styrene) followed by their polymerization in the polyurethane matrix have been studied by means of dynamic mechanical analysis. It is found that…
Small nanoparticles have a large proportion of their atoms either at or near the surface, and those in clusters are essentially all on the surface. As a consequence, the details of the surface structure are of paramount importance in governing the overall stability of the particle. Just as with bulk materials, factors…
Abstract Two germanotungstates based on the dysprosium cations and monovacant Keggin anions [GeW 11 O 39 ] 8− , [(CH 3 ) 4 N] 1.5 H 3.5 [Dy(H 2 O) 2 (GeW 11 O 39 )]·1.5H 2 O ( 1 ) and [Cu(Hen)(en)] 2 [Cu(H 2 O) 3 ] 0.5 {[Cu(H 2 en)(Hen)]‐[Cu(H 2 O) 3 ] 0.5 [Dy(GeW 11 O 39 ) 2 ]}·1.25H 2 O ( 2 ), have been synthesized…
A thermostimulated sol-gel transition in a system prepared by mixing a ZrOCl(2) acidified solution to a hot H(2)SO(4) aqueous solution was studied by dynamic rheological measurements and quasi-elastic light scattering. The effect of temperature and of molar ratio R(S) = [Zr]/[SO(4)] on the gelation kinetics was analyz…
Recent increased interest from regulators and the public has led more organizations to consider the environmental impact and safety considerations of tritium handling. Examples include the significance of the tritium isotope separation system on ITER licensing, remediation of ground water from power utilities and gove…