Materials Literature
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The electrical behaviour of porous silicon layers has been investigated on one side of p-type silicon with various anodization currents, electrolytes, and times. Electron microscopy reveals the evolution of porous silicon layer morphology with variation in anodization time. In this work electrical conductivity of bulk…
Air pollutants can cause health problems, such as bronchitis and cancer, and are now recognized as a social problem. Hence, a method is proposed for the collection and removal of gaseous air pollutants by aerial ultrasonic waves and water mist. Typically, gas removal effects are studied using lemon oil vapor ("lemon g…
Catalytic cracking of n-hexane over MFI-type zeolite catalysts was examined at a reaction temperature of 823 K under atmospheric pressure. Conversion of n-hexane depended on the Si/Al ratio of the MFI-type zeolite cata- lyst, so the relationships between the product yields and n-hexane conversion could be fi tted as s…
A thermodynamic analysis is performed for the oxygen solutions in niobium-containing Fe-Ni melts. The deoxidizing capacity of niobium in iron—nickel melts is shown to be low. It decreases slightly as the nickel content in a melt increases to 40% and then increases insignificantly as the nickel content increases to 60%…
An examination is made of the effect of modifying montmorillonite with organic compounds and its ultrasound treatment on the rheological properties of filled epoxy oligomers and the structure and physicomechanical properties of cured composites. To improve the physicomechanical properties of filled epoxy composites, i…
Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.
Annealing effect on structural and electrical properties of W-doped IZO (WIZO) films for thin film transistors (TFT) was studied under different process conditions. Thin WIZO films were deposited on glass substrates by RF magnetron co-sputtering technique using indium zinc oxide (10 wt.% ZnO-doped In2O3) and WO3 targe…
High-density perovskite titanate zirconate-modified potassium niobate solid solutions 0.92(Na0.5K0.5)NbO3–xBaZrO3–(0.08-x)(Bi0.5K0.5)TiO3(BBK) and Mn-added BBK have been prepared by the solid-state reaction method. The phase diagram summarized from the dielectric measurement reveals that there exists a tetragonal–rhom…
We investigated Cadium Selenide quantum dots embedded in the Si solar cell in order to improve the efficiency of conventional Si solar cell. CdSe quantum dots with 3 to approximately 4 nm size were printed on the phospho-silicate glass layer grown over the emitter surface of p-n junction Si solar cells during the phos…
The Molten Salt Reactor (MSR) is classified as the non-classical nuclear reactor type based on the specific features coming out from the use of liquid fuel circulating in the MSR primary circuit. Other uniqueness of the reactor type is based on the fact that the primary circuit of the reactor is directly connected wit…
The advanced nuclear system will significantly advance the science and technology of nuclear energy systems and to enhance the spent fuel proliferation resistance. Minor actinides (MA) are viewed more as a resource to be recycled, and transmuted to less hazardous and possibly more useful forms, rather than simply disp…
Abstract The planar diamagnetic complexes [Ni(achdtc)2] (1),[Ni(achdtc)(PPh3)(NCS)] (2), and [Ni(achdtc)(PPh3)2]ClO4·0.5EtOAc (3) (achdtc = allylcyclohexylcarbodithioate) were prepared, characterized by elemental analysis, electronic, IR, NMR (1H, 13C, and 31P) spectroscopy and the crystal structures were determined b…
This paper presents the results of ab initio calculations of the equilibrium geometry, the electronic structure, and the spin and charge densities for neutral and negatively charged defects produced by the Mn and Cr impurities in the B position of the SrTiO3 structure. It has been shown that, in both cases, the neutra…
Field emission current noise analysis of carbon based materials such as multiwalled carbon nanotubes, undoped graphene, nitrogen doped graphene, boron doped graphene, and polyaniline nanotubes is carried out at base pressure of ~1× 10-8mbar. All the field emitters exhibited `step' and `spike' like fluctuations in the…
En este trabajo se estudian las diatomeas halladas en cuerpos de agua lenticos localizados en el departamento de Cordoba, noroeste de Colombia. Las muestras se analizaron con microscopios optico y electronico de barrido. Los taxones tratados pertenecen a los ordenes Thalassiosirales (1), Cymbellales (4), Achnanthales…
Numerical estimations of microhardness (by Vickers, HV) for osmium borides (OsB, OsB2), carbides (OsC, Os2C3, OsC2), and nitrides (OsN, OsN2, OsN4), as well as for some ternary diborides (Os1−x M x B2, M = W, Re, Ru), based on correlation dependences of HV on the shear (G) and Young (Y) moduli of these phases are perf…
The fundamental acoustic properties of amorphous Ta2O5 and Nb2O5 thin films prepared by RF sputtering were evaluated using a Rayleigh-type surface acoustic wave (SAW) on 128° YX-LiNbO3 and a shear-horizontal-type SAW on 36° YX-LiTaO3. The elastic constants c 11 and c 44 of the thin films were determined from the measu…
In triggered high-intensity focused ultrasound (HIFU) treatment, cavitation clouds are produced by extremely high intensity trigger pulses and enhance the effect of following heating waves. The ultrasound intensity must be quickly changed from that for trigger pulses to that for heating waves before cavitation clouds…
In this paper, using chemical degumming method on corn bract fiber degumming experiment, in order to find a more suitable degumming process of corn bracts and to realize the development and utilization of corn bract fiber. "Pre-oxygen pretreatment + Two scouring" chemical degumming method was used, and the optimal com…
The term knock-down factor is commonly used to describe the reduction in fatigue life in a corrosive environment (e.g. sour service) compared to performance in air. However, the mere concept of such a reduction factor is potentially misleading, particularly when comparing different welding procedures that demonstrate…