Materials Literature
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The influence of altitude on the distribution of harvestmen (Opiliones) and on their species diversity in Slovakia was studied. The data were obtained from the numerous published sources and from the unpublished results of the author’s own research activity. These basic results include the findings of 32 species from…
The study of the radiation hazards from building materials is of interest in most countries. The measurements of natural radioactivity were verified for some Egyptian building materials to assess any possible radiological hazard due to their use. The measurements were performed by gamma-ray spectroscopy using a Hyper-…
Hybrid organic-inorganic bis-tetrabutylammonium-7,7'-(iminundecahydro-closo-dodecaborate)-9,9'-(dihexyl)-2,2'-bifluorene (5) was prepared, and the influence of the closo-dodecaborate cluster on the two-photon absorption properties of bi-fluorene derivatives was demonstrated.
To investigate the effects of post-coat substrate quenching on the tribological properties of TiN film, a specimen was prepared in which the steel substrate (carbon tool steel, JIS SK3) was quenched after TiN coating, and the ball-on-disk type wear test was carried out using a ZrO2 ball. The delamination initiation li…
Host molecules effectively prefer to recognize F- ion rather than H2O through the upper rim, utilizing strong C-H (N-H)F- interactions. The electropositive field space ("electropositive field space") at the lower rim of the host molecules can also act as a good binding site for small anions such as F-. The electron wi…
This contribution deals with the evaluation of blasted surfaces used for forming adhesively-bonded joints. It was observed that surface quality evaluation by R a arithmetic mean average roughness-parameter, only was insufficient. Experimental results show there is no direct correlation between surface roughness and bo…
DS3C model is applied to study single ionization of helium by 102eV electron impact. Fully differential cross sections are calculated at different scattering angles of θ1 (8°，10°，15°，20°) for the perpendicular plane geometry. The results of 3C and CCC model were compared with experimental data, which sho ws that DS3C…
Рассмотрены имеющиеся подходы к расчету разрушения.Описана теоретическая модель, численный метод и результаты расчета разрушения растягиваемых образцов из упругопластического материала с макропорами и жесткими включениями.Макропоры рассмотрены непосредственно как полости в сплошной среде, имеющие круглую или эллиптиче…
Silicon carbide (SiC) is a wide band gap semiconductor being developed for high temperature, high power, and high frequency device applications. For the manufacturing of SiC to semiconductor substrate, many researchers have studied on the subject of SiC polishing. However, SiC faces many challenges for wafer preparati…
Fracture is the most common cause of die failure in hot extrusion. Prediction of fracture life requires a reasonably accurate determination of plane-strain fracture toughness (KIC). Standard K(KIC) testing is difficult, time-consuming, and costly. Charpy impact energy (CVN) is often used as an indirect measure of frac…
According to the deformation characteristics of plasma sprayed ceramic thermal barrier coatings(TBC) and directional solidified superalloy substrate,viscoplastic constitutive models were introduced.Static oxidation test and thermal fatigue test of thermal barrier coating structures were conducted along with related FE…
The shock properties of C30 concrete with initial porosity is investigated by gas gun planar impact technique. The manganin pressure gauge is used to measure the pressure-time curves of the samples. It is shown by the experimental studies on the shock Hugoniot relationship and the Grüneisen-type equation of state for…
In this study, natural radioactivity removal methods have been compared for present drinking water supplies (privately owned wells or small water works) which have radioactivity values higher than determined standards (WHO & EPA standards). There are several methods known to remove radioactivity from water such as aer…
Early stages of nanocrystallization in Al 92 Sm 8 and Al 91 Gd 9 glassy melt-spun alloys were investigated in-situ using simultaneous small- and wide-angle X-ray scattering (SAXS/WAXS). The measurements were performed during isothermal annealing at temperatures below crystalli- zation point. The results are supported…
Both Ge light-emitting diodes and photodetectors are demonstrated by using the same metal-insulator-semiconductor (MIS) tunneling structure. A Ge MIS tunneling diode biased at the accumulation region is used as a light-emitting device and a Ge MIS tunneling diode biased at the inversion region is used as a photodetect…
To reduce uncertainties in the safety assessment of the disposal system for long-lived radioactive waste, cement was developed which generates leachates with a lower pH than that of ordinary cement paste. This cement is termed “low-alkaline cement”. Large amounts of pozzolans were used to produce the low-alkaline ceme…
A colloidal damper is a damping element that has a novel structure which is fusing technology of mechanical engineering and nanotechnology. This structure is composed of cylinder and piston in which a mixture of hydrophobic porous matrix and liquid are inserted. If an external force impresses to the damper, the pressu…
The electrical properties of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-0.3PT) single crystal/polymer 1-3 composites were simulated under different volume fraction of the piezoelectric phase. It was concluded that the composites exhibit optimal properties when the PMN-0.3PT volume fraction is around 64%. Under this volume fra…
Hot compression tests of 7075 aluminium alloy were operated on Gleeble-1500D thermal simulator at a constant strain rate of 1 /s and a temperature from 300 to 400 ℃.The microstructur es of hot deformed alloy were observed by transmission electron microscopy to research the effect of temperature on microstructure evolu…
The shock characteristics of a tangent nonlinear packaging system with critical component are investigated under the action of a half-sine acceleration pulse.The dynamical model of the system is developed,and the numerical results of the dynamical equations are obtained.Then,to evaluate its damage potential,a concept…