Materials Literature
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Fractional charge may arise when fermionic zero modes exist in a topological background field. In biased bilayer graphene (BBLG), the bias plays the role of the nontrivial background field. When semi-infinite BBLG with a zigzag edge is used, the dynamics induces an odd number of zero-energy modes, which, together with…
To enable highdriving speed and to reduce the charging time of gatecapacitors in the device, a high electrical conductance isrequired. The electrical conductance of a TFT is determinedby the product of charge carrier mobility (semiconductorproperty) and charge carrier density in the channel, governedby the capacitance…
We report the synthesis and thermal annealing of Si-core/ZnO-shell nanorods using a two-step process comprising the metal-assisted electroless etching of Si and the sputter deposition of ZnO. Transmission electron microscopy and X-ray diffraction analysis showed that the cores of the annealed core-shell nanorods were…
In the title compound, [Co(NCSe)(2)(C(9)H(7)N(7))(2)(H(2)O)(2)], the Co(2+) cation is coordinated by two seleno-cyanate anions, two 2,6-bis-(4H-1,2,4-triazol-4-yl)pyridine ligands and two water mol-ecules within a slightly distorted N(4)O(2) octa-hedron. The asymmetric unit consists of one Co(2+) cation, which is loca…
Since the fuel is always exposed to turbulent flow, the grid strap shows flow induced vibration characteristics that impact on the nuclear fuel soundness. The dynamic behavior of grids in nuclear fuels is quite complex, since two pairs of spring and dimple support are contacted with rods by friction in the limited spa…
This study presents a facile way synthesizing disc-like lipid bilyaer nanostructures with a cationic amphiphilic polyelectrolyte. The cationic amphiphilic polyelectrolyte was in a form of partially quarternized copolymer and was synthesized with 2-(dimethylamino)ethyl methacrylate and stearyl methacrylate. At some con…
A molecular orbital study is presented of the magnetic coupling in the one-dimensional vanadium oxide $Ba_2V_3O_9$ with a bridge formed by two different types of $VO_4$ tetrahedra. The concept of complementary versus counter-complementary effect has been used to explain the structural origin of the magnetic behavior o…
The energy spectra of UO2 samples with slight hyper‐stoichiometry were measured. In addition to the regular peak detected at 20 eV, it was observed that another peak at 80 eV would grow with the increasing stoichiometry. The relative intensities of the two peaks were used to determine the surface O/U ratio of the samp…
Los Alamos National Laboratory has a number of spherical confinement vessels (CVs) remaining from tests involving nuclear materials. These vessels have an inner diameter of 6 feet with 1 to 2 inch thick steel walls. The goal of the Confinement Vessel Disposition (CVD) project is to remove debris and reduce contaminati…
Abstract In this article, the research and development of high performance polyarylene sulfide (PAS) matrix resins and composites are introduced. The synthesis route and method of the major varieties of PAS resins are described in detail, such as polyphenylene sulfide, polyarylene sulfide sulfone, polyarylene sulfide…
通过膜层设计理论设计出以K9玻璃为基底的兼具高透过率和高耐摩擦性的三层宽带增透膜, 并通过溶胶-凝胶技术成功制备了所设计的增透膜. 以正硅酸乙酯(TEOS)和钛酸丁酯(TTIP)为前驱体、以盐酸为催化剂制得SiO 2 和TiO 2 溶胶. 将两种溶胶按一定比例混合得到SiO 2 -TiO 2 复合溶胶. 实验结果表明: 三层增透膜在可见光区的平均透过率达到98.7%, 与未镀膜的K9玻璃基片相比提高了7.1%. 增透膜经较强机械摩擦后透过率基本保持不变, 表明该增透膜具有优良的耐摩擦性. 采用六甲基二硅氮烷(HMDS)对增透膜表面进行进一步的修饰, 修饰后增透膜与水的接触角提高至94.3°, 增透膜的疏水性及环境稳定性得到较大的提…
Abstract The process for certification of composite structures for civilian, CIVIL, and military, MIL, aircraft has been evolving for about 40 years. The technology base for the certification process is now mature enough to support the process. This article describes how the certification process has been tailored to…
For a quantum walk on a graph, there exist many kinds of operators for the discrete-time evolution. We give a general relation between the characteristic polynomial of the evolution matrix of a quantum walk on edges and that of a kind of transition matrix of a classical random walk on vertices. Furthermore we determin…
Abstract Current spacecraft designs include materials and structural systems engineered to satisfy a variety of requirements, including structural integrity, damage tolerance, radiation protection, debris/micrometeoroid shielding, and thermal insulation. To comply with these different design requirements, composite ma…
The substitution of an expensive olefin by less expensive alkanes as feedstock in selective oxidation processes has had increasing interest from the chemical industry. In the last two decades, a research effort has been devoted to the development of efficient processes for the partial oxidation of light alkanes. This…
Abstract As advanced composite structures become larger and more complex, there is a corresponding need to improve methods of joining and assembly. Current methods of joining composite materials for aerospace applications, that is, adhesive bonding and mechanical fastening, present some design and manufacturing limita…
PENGARUH NITRIDASI ION SUHU RENDAH PADA KETAHANAN AUS DAN KOROSI BIOMATERIAL STAINLESS STEEL AUSTENITIK 316L. Dalam penelitian ini telah selesai dilakukan proses nitridasi ion dan karakterisasi cuplikan SS 316L. Proses nitridasi ion telah dilakukan pada cuplikan untuk variasi suhu nitridasi 350, 400, 450, 500, dan 550…
Abstract In this article polypivalolactone ‐ carbon fiber composites are presented. In particular the crystallinity of polypivalolactone (PPL) is higher than that of polyetherether ketone (PEEK)or polyphenylene sulfide (PPS) and this high value leads to far better strength, stiffness, solvent resistance, and temperatu…
Abstract Composite materials have the final properties, which are combination of the main constituents of matrix and fiber. In order to get target properties, fiber should have unique properties. Fibers are responsible for having superior properties which are important to upgrade the properties of the matrix. In this…
Questo lavoro di tesi verte su uno studio finalizzato alla realizzazione di un modello per la reazione di polimerizzazione in soluzione del Metilmetacrilato. Tale modello ha lo scopo di seguire la cinetica e l'andamento dei pesi molecolari e della polidispersita' durante la reazione di polimerizzazione, in un sistema…