Materials Literature
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횡방향 관통 효율 강화 탄체(PELE)는 기폭장치가 없는 새로운 개념의 발사체이다. PELE 는 배면이 닫혀있는 고밀도 피복과 저밀도 충전재로 구성되어있다. PELE 의 폭발 특성을 연구하기 위해 AUTODYN-3D code 를 이용하여 발사체와 표적체의 모델을 구축하였다. PELE 의 의해 알루미늄-2024 합금 표적체를 천공하는 과정을 시뮬레이션으로 구현하였으며 또한 다양한 내부 충전재에 의해 분산되는 표적체의 파편 특성도 연구하였다. PELE 파편의 유한요소해석은 AUTODYN-3D code 의 추계학적 파괴기준을 사용하여 구현되었다. 내부 충전재의 팽창으로…
In the EPR spectra of iron-doped lead germanate single crystals, triclinic Fe 3+ paramagnetic centers have been found in addition to trigonal centers. Their contribution increases upon annealing in a chlorine-containing atmosphere. The parameters of the spin Hamiltonian of three triclinic centers assigned to Fe 3+ -Cl…
The influence of the conditions of processing of polyester fiber material in the supercritical carbon dioxide (SC-CO 2 ) medium on the localization of ethylene terephthalate cyclic oligomers on the surface of fibers is studied. It is shown that cyclic oligomers are deposited on the surface of polyester fiber materials…
This paper presents the application of the Nano Porous Gold (NPG) for encapsulating the MicroElectroMechanical System (MEMS) devices. The NPG was realized by selective etching of the Sn from electroplated AuSn alloy on ap articular seed layer. However, it is very difficult to form through pores during selective etchin…
In the present paper, a study on graphene-based ferromagnetic/d-wave superconductor (Fd) junction using the Blonder-Tinkham-Klapwijk formalism and Dirac-Bogoliubov De-Gennes equation has been done. The effect of rotation of order parameter on the transport properties of this structure is investigated. This rotation is…
Wood pulp composite spunlaced nonwoven is a new environment-friendly material that can disintegrate in toilet system. It could be easily flushed into septic or sewer systems, thus avoids the risk of clogging the pipes. In this study, the flushable wood pulp composite spunlaced nonwoven was prepared and the flushabilit…
We have investigated the folding of two helix-bundle proteins, 36-residue Villin headpiece and 56-residue E-domain of Staphylococcal protein A, by combining molecular dynamics (MD) simulations with Coarse-Grained United-Residue (UNRES) Force Field and all-atom force field. Starting from extended structures, each of th…
The inhibition characteristics of a macrocylic compound namely 1, 2, 4, 7, 9, 10-hexaazacyclo- pentadeca-10, 15-dien-3, 5, 6, 8-tetraone (HPTT) has been investigated on acid corrosion of mild steel in 1 M HCl using gravimetric measurement, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization.…
摘要： 以聚二烯丙基二甲基氯化铵和聚苯乙烯磺酸钠为构筑单元，通过静电层层自组装制备了多层膜，利用薄膜中存在的抗衡阴离子，选择AuCl-4和PtCl2-6作为Au和Pt的前驱体，通过连续的阴离子交换/还原，原位制备了Au-Pt双金属纳米粒子。 紫外-可见分光光度法、透射电子显微镜和能量色散X射线能谱数据表明，在聚电解质多层薄膜中成功地制备了具有核壳结构的Au@Pt双金属纳米粒子。 这种纳米粒子在电化学催化、燃料电池方面具有潜在的应用价值。
We prepared and investigated the thermoelectric properties of Cu 0.4 InTe 2 at 310–710 K. The crystal structure of Cu 0.4 InTe 2 was identical to that of CuIn 3 Te 5 , namely a tetragonal structure, space group P 2 c , known as an ordered defect chalcopyrite. This structure is different from that of CuInTe 2 , which h…
Organic nano-cocrystals of functional dyes of perylene and a perylene derivative were successfully prepared by the reprecipitation method. The particle sizes, optical properties, and powder X-ray diffraction patterns of nano-cocrystals were evaluated. Typically, the size with size distribution of nano-cocrystals was 5…
This paper proposes the design of a Hexagon Split Ring Resonator (HSRR) with skew angle rotation between inner and outer ring. Mathematical expressions for the resonant frequency of HSRR are formulated. The CAD model of the HSRR is analyzed for electric and magnetic fields in a finite element (FEM) method mode solver…
The growth of Anatase nanostructured films using dc reactive magnetron sputtering and post-annealing treatment is reported. TiO2 has been deposited on Porous Anodic Alumina Films used as templates which were previously grown in phosphoric acid solution and etched to modify their pore diameters. This synthesis via resu…
Using first-principles calculations, we predict that a single C2H4 or C5H5 molecule can form a stable complex with two rare earth metals such as La, Eu, and Ho. The La2C2H4 complex then absorbs up to sixteen hydrogen molecules, reaching a gravimetric storage capacity of 9.5wt% by adding a rare-earth metal atom, The re…
8th South African Conference on Computational and Applied Mechanics (SACAM 2012), Johannesburg, South Africa, 3-5 September 2012
A fully implicit numerical method, based upon a combination of adaptively refined hierarchical meshes and geometric multigrid, is presented for the simulation of binary alloy solidification in three space dimensions. The computational techniques are presented for a particular mathematical model, based upon the phase-f…
Improveme nt of the prope rties of ceme nt waste formsstyre nate d polyeste r base d on poly (oxy- die thyle ne maleate) as a polyme r additive was investigate d. The composite material of ce me nt/polymer was use d as a matrix for the immobilization of borate waste simulates. Porosity and pore size distribution of th…
Mechanical characteristics of nitrated and carbonitriding in electrolyte plasma steel Р6М5 surface layers are investigated in the research. It shows perspectiveness of the cutting tool electrolyte-plasma treatment technology. Comparative research of structure, phase composition of fast-cutting P6M5 steel modified surf…
The microwave absorbing properties of multi-walled carbon nanotubes-reinforced cement-based composites (MWCNTs/CC) in the range of 2–18 GHz were investigated in this paper. MWCNTs with the addition of 0.08% by mass of cement were incorporated to cement mortar. It is shown that MWCNTs which act as microwave absorber re…
Carbon nanofibers have been utilized increasingly for enhancing the mechanical properties of advanced polymer composites, which include high strength, stiffness, toughness, and through-thickness Properties. The incorporation of nano particles with a high aspect ratio and extremely large surface area into polymers impr…