Materials Literature
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Recent observations show that the strain reversal affects significantly and in a complex way both the static recrystallisation (SRX) and strain-induced precipitation (PPT) kinetics in Nb-microalloyed steel. It is already known that the recrystallisation stagnation is a consequence of the competition between the drivin…
본 논문에서는 알루미늄 7075-T6 재료의 부식 기간별 표면 산화막 형성이 피로거동에 미치는 영향에 대해 연구하였다. 사용된 알루미늄 재료는 부식에 대한 부동태화 현상으로 부식저항 특성이 높은 금속으로 알려져 있다. 알루미늄 합금은 다른 재료에 비해 가볍고 강한 재료 특성 때문에 항공기 부품 산업과 같은 다양한 산업분야에서 널리 사용되고 있다. 때문에 부식에 대한 재료의 피로거동 특성과 부식에 대한 부동태화 특성에 대한 연구가 요구된다. 4절점 회전 굽힘 시험기를 사용하여 부식 기간별 재료의 피로거동 특성을 확인하였고, 표면 거칠기를 측정하여 부식 기간별 알루미늄…
The primary feedstock for synthetic fuel production is syngas, a mixture of carbon monoxide (CO) and hydrogen. Current hydrogen production technologies rely upon fossil fuels and produce significant quantities of greenhouse gases as a by-product. This is not a sustainable means of satisfying future hydrogen demands gi…
The proposal of this research was to compare the optical and electrochromic properties of tungsten oxide (WO 3 ) thin films deposited with a horizontal direct current (DC) and DC pulse magnetron sputtering. These WO 3 thin films were deposited onto indium tin oxide (ITO) glass and p-type silicon substrate at different…
Few nanometers thick graphene layers were directly grown on a -plane (11 0) sapphire substrates by alcohol-chemical vapor deposition (alcohol-CVD) using ethanol as a carbon source and without any catalytic metal on the substrate surface. The growth relationship between the graphene layer and substrate was analyzed usi…
The structure and the magnetocaloric effect of single-phased Mn0.997Fe0.003As were studied with X-ray diffraction and vibrating sample magnetometry. In the Mn0.997Fe0.003As sample, the firstorder ferromagnetic-to-paramagnetic transition was observed near the Curie temperature (T C ), namely at 308 K for the quenched s…
Abstract Microscale SiC particles with multiwalled carbon nanotubes grow on were filled in epoxy resin to construct multiscale hybrid composite. Static and dynamic compressive responses of composites were investigated. A dynamic experimental technique, split Hopkinson press bar (SHPB), was introduced to study the cons…
Green synthesis of metal nano particles is an emerging branch of nanotechnology, very cost effective, eco-friendly, thus, can be an economic and efficient alternative for the large-scale synthesis of nano particles. This study focuses on the bio synthesis property of Peanut (Arachis hypogaea L.) leaf extract in the sy…
Substituted strontium ferrites SrFe12-xCrx/2Alx/2O19 (x=0–2.5) / multi-walled carbon nanotubes (MWCNTs) nanocomposites were prepared by a sol- gel method. The XRD patterns show a relatively weak peak at around 26º, corresponding to the graphite (002) lattice plane of the MWCNTs. The peak of Fourier transform infrared…
Au and Au-Ce promoted catalysts supported on zeolites (Beta, H-MCM-22, H-Mordenite, ZSM-5), mesoporous material MCM-41 and metal oxides (TiO2, SiO2, Al2O3) were prepared. Catalysts were characterized by a range of methods: nitrogen physisorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse…
In this paper, an amorphous core transformer is highlighted. Configuration of amorphous C-core and its magnetisation characteristic (B-H) are described. Factors affecting the design are also discussed as a comparison with a conventional transformer. It is concluded that, advantages with amorphous core transformers are…
Nowadays, due to the stringent engine emission norms, an efficient technique is required to reduce oxides of nitrogen (NOX) from automobiles especially from the lean burn engines. Although Urea Selective Catalytic Reduction (SCR) is capable of satisfying these norms, the ammonia slip nullifies its advantages. Ammonia…
The polycrystalline sample of (K0.5Bi0.5)(Fe0.5Nb0.5)O3 was synthesized by a high- temperature solid-state reaction technique. The material crystallizes in cubic structure at room temperature. The dielectric properties of the material were investigated in a temperature range from 30-200 ºC in the frequency range (102–…
Steels and stainless steels are the most commonly used metals currently in the world. They are favoured in a wide area of applications due to their properties such as reasonable strength, ease of fabrication, and relatively low cost. Mild steels, however, corrode in many media, including most outdoor environments. The…
The tri-isotropic (TRISO) fuel developed for High Temperature reactors is known for its extraordinary fission product retention capabilities [1]. Recently, the possibility of extending the use of TRISO particle fuel to Light Water Reactor (LWR) technology, and perhaps other reactor concepts, has received significant a…
Complexation in the systems Pd(II)-Cl − -HA-H 2 Glu (HA is the l - or d -conformer of 2-methylamino-1-phenylpropanol; H 2 Glu is glutamic acid) was studied using pH-metric titration, electronic absorption spectroscopy, and quantum-chemical modeling. It was found that the ratio of the complex species largely depends on…
Polycrystalline samples of Bi(Mg0.5Ti0.5)O3-PbTiO3 (BMT-PT) solid solutions exhibit high ferroelectric Curie temperatures and are promising materials for high temperature piezoelectric devices. A morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal phases occurs between BMT-PT ratio of 7…
The mechanisms and factors causing or influencing degenerative diseases require tailor-made solutions. Natural polysaccharides are among the most versatile building units of the novel drug delivery systems. Their properties can be easily tailored to specific needs because they depend not only on the first-order struct…
The adsorption of oxygen and hydrogen at the surface of a film consisting of SnO 2 nanoparticles has been studied using atomic force and scanning tunneling microscopy and spectroscopy in combination with Auger electron spectroscopy. The influence of adsorbed molecules on the electronic structure of nanoparticles is de…
IR absorption spectra of monoisotopic 28SiH4 and 76GeH4 are studied in Ar and N2 matrices at 10 K. It is shown that the absorption spectra of silane and germane are similar in the regions of the stretching ν3 and bending ν4 vibrations. Four groups of bands can be separated out in the spectra of each molecule: (1) narr…