Materials Literature
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This study presents the results of exhaust gas recirculation (EGR) and cyclonic separator for simultaneous oxides of nitrogen (NOx) and particulate matter (PM) reduction in a direct injection (DI) diesel engine under different engine loads and speeds. There is a significant NOx reduction by EGR, but PM is hugely incre…
Self-consistent ab initio calculations were carried out to study the structural, electronic and magnetic properties of nine ternary compounds Ca 4 XA 3 ( X = B , C and N ; A = S , Se and Te ). The calculations were performed by using tight-binding linear muffin tin orbital (TB-LMTO) method within the local density app…
Abstract This paper compares the luminescence of different modifications of silicon dioxide — silica glass, α-quartz crystal and dense octahedron structured stishovite crystal. Under x-ray irradiation of pure silica glass and pure α-quartz crystal, only the luminescence of self-trapped exciton (STE) is detected, excit…
The composite barium strontium cobalt ferrite (BSCF) cathodes were investigated in the intermediate temperature range of solid oxide fuel cells (SOFCs). The characteristics and electrochemical performances of composited BSCF/samarium doped ceria (SDC); BSCF/gadolinium doped ceria (GDC); and BSCF/SDC/GDC were compared…
The fluorine and aluminum coordination environments and their evolution during precipitation of CaF 2 , SrF 2 , and (Ca x Sr 1− x )F 2 nanocrystals in oxyfluoride glasses and glass–ceramics are investigated using 19 F and 27 Al magic‐angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. These structural as…
Abstract Summary: High‐impact polystyrene (HIPS) is a hetero‐phase polymer with the so‐called salami morphology. Salami morphology is formed by a continuous PS phase containing micron‐sized PB domains. PB domains contain submicron‐sized irregular PS occlusions. In our modeling work we addressed several weak points of…
Abstract We study a coarse grained model of cylinder forming diblock copolymers and nano‐particles (NPs) mixture confined between Lennard–Jones hard walls. Two models for non‐selective interactions between monomers and NPs are applied. In the case of purely repulsive interactions between NPs and monomers (athermal cas…
The dielectric and magnetic properties of manganese oxide-coated Fe3O4 nanoparticles (NPs) were measured by the transmission/reflection method in 2-18 GHz. MnOx-coated Fe3O4 NPs were prepared by sol-gel method followed by heat-treating at 300, 400, and 500 °C, respectively. The heat-treated powders were then used as m…
Nutrient cycling is an important part of integrated nutrient management. The effects of crop (potato, sunflower, rape) residues, weed residues, fruit waste, vegetables waste, tree leaves, sheep manure, and poultry manure on K release in five calcareous soils was investigated. The soils and plant residues were incubate…
We propose a broadband circular polarizer in the terahertz region using helical metamaterials. The finite difference time domain method was used to design the structure and perform the simulation. By properly selecting the parameters of helical metamaterials, including the radius of wires, number of helix-periods, spa…
Abstract High pressure measurements attracted attention from the Semiconductor Physics community after the discovery of William Paul's Empirical Rule. The technique gained further momentum with the invention of the diamond‐anvils high pressure cell. Since diamond is transparent from near IR to near UV many forms of op…
본 연구는 수계에서 오랜 시간 동안 안정한 생체적합 금 나노입자의 제조에 관한 것으로, 환원제와 안정제의 역할을 동시에 수행하는 폴리에틸렌이민을 이용하여 응집성이 낮은 초미립 폴리에틸렌이민-금 나노입자를 상온의 수용액 상에서 합성하였다. 폴리에틸렌이민-금 나노입자의 평균 입자크기는 8∼12 nm이었고, 수계의 나노콜로이드 상에서 50 nm 내외의 클러스터를 형성하였으며, 매우 뛰어난 안정성을 보였다. 상대적으로 낮은 금속 전구체의 농도에서 나노입자를 제조하였을 때, 입자의 크기가 두드러지게 감소하는 경향을 나타내었다. 폴리에틸렌이민-금 나노입자의 X-선 회절분석 결…
In this study, the redox state of iron in sodium silicate glasses was varied by changing the melting conditions, such as the melting temperature and particle size of iron oxide. The oxidation states of the iron ion were determined by wet chemical analysis and UV-Vis spectroscopy methods. Iron commonly exists as an equ…
Abstract Biodegradable Poly(glycolic acid) (PGA) nanofibers were prepared by irradiating a PGA fiber with radiation from a carbon dioxide (CO 2 ) laser while drawing it at supersonic velocities and was collected as a nonwoven. A supersonic jet was generated by blowing air into a vacuum chamber through the fiber inject…
The purpose of this work is to show the hidden effect of the first transport cross-section in the study of the beam electrons transport impinging in solid targets by using the Monte Carlo method. For this, our study is based on our model of differential elastic cross-section given [A. Bentabet, Z. Chaoui, A. Aydin and…
A three-component Ge-As-Se system is studied by the nuclear quadrupole resonance (NQR) method on (75)As nuclei and by the nutation NQR spectroscopy. The NQR (75)As spectra of the glasses Ge(0.021) As(0.375) Se(0.604), Ge(0.043) As(0.348) Se(0.609) and Ge(0.068) As(0.318) Se(0.614) reveal broad lines with two peaks ass…
The magnetism and electronic structure of bcc <TEX>$Al_1Fe_{26}$</TEX> was investigated by means of first-principles calculations with and without spin-orbit coupling (SOC). From the calculated total energy, the SOC corrected system is shown to be approximately 5 meV per atom lower than the SOC uncorrected system. The…
In a recent paper [Panczyk, T.; Warzocha, T. P.; Camp, P. J. J. Phys. Chem. C 2010, 114, 21299] we discussed some of the factors controlling the properties of a magnetically controlled molecular nanocontainer composed of a carbon nanotube and magnetic nanoparticles. This paper complements that study by (1) analyzing t…
Abstract Summary : Acrylic monomers are important intermediates for the chemical industry. Especially acrylic acid (AA) is the basis for various reactions, such as polymerizations and esterifications and is, therefore, responsible for high product diversity. Spontaneous polymerization is a safety problem during the tr…
The development of high-efficiency DC motors is a very important technique subject from the viewpoint of energy saving. In order to increase the motor efficiency, three different grades of electrical steel laminations are used to design a brushless DC (BLDC) motor in the paper since they provide reduced core losses. A…