Materials Literature
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Composite and polymeric materials are used throughout the marine industry for numerous applications. The aim of this paper is to set out the general architecture of composite materials and present the strength properties for the composite and polymeric materials from the marine industry. The study of the architecture…
Na Fakultetu kemijskog in`enjerstva i tehnologije (FKIT) istra`ivanja na podru~ju polimernog in`enjerstva po~ela su se intenzivno razvijati sedamdesetih godina pro{log stolje}a, a od osamdesetih razvija se i nastava na podru~ju polimera.Otvorena su nova podru~ja istra`ivanja polimernih materijala vezana za starenje, d…
Les jonctions tunnel magnetiques (JTM) epitaxiees a barriere MgO constituent probablement le systeme le plus prometteur pour des applications allant des tetes de lecture aux memoires magnetiques. De plus, de telIes jonctions mettent en jeu une physique nouvelIe et fascinante, celIe de la physique du transport electron…
Surface and acid-base properties of the commonly used polymers, polymeric composite mate-rials based on ethylene copolymers, synthetic rubber and their based on composites and metals by means of E. Berger methods were investigated. Estimation of metal roughness was made. Effect of modification on acidity and basicity…
A series of high-velocity impact tests on impactors and targets of varying acoustic impedance, including Al − Ti, Ti steel and Ti −Ti combinations, reveals a β ↔ ω phase transition in the α + β Ti alloys under shock loading. The presence of the ω-phase is confirmed by X-ray diffraction analysis of Ti 4.5Al 3Mo 1V allo…
En este trabajo se estudio el uso de complejos metalocenos soportados sobre cloruro de magnesio-alcoxisilanos (MgCl2/SiCl4-n(OHex)n) con el objeto de mejorar las propiedades cataliticas de los metalocenos y las propiedades morfologicas de los polietilenos obtenidos. Los aductos se prepararon mediante la disolucion de…
A multi-scale quantum chemistry method is used to study field emission from arrays of carbon nanotubes. The image potential is effectively given by the image potential of an ideal metal sphere with atomic size. When the image potential is included， the field emission current density is 6 times stronger than the result…
利用固相反应法制备了高纯、高致密稀土硅酸盐氧基磷灰石RE9．33（SiO4）6O2（RE=La，Nd，Sm，Gd）陶瓷材料，用XRD对所合成的RE9．33（SiO4）6O2粉末和烧结得到的块体材料进行了分析表征。系统研究了RE9．33（SiO4）6O2陶瓷材料的声子速度和弹性模量，结果表明其平均声速小、弹性模型低。另外，利用Cahill模型对其热导率进行了理论计算，其极限热导率在高温下为1．18～1．22w／m·K。从结构等各方面推断了RE9．33（SiO4）6O2陶瓷材料的低热导可能性。
Fractures are the most frequent health problem associated with bone and represent a significant clinical and economic burden. Clinically, fracture risk is diagnosed by low bone mass and interventions to reduce fracture risk are designed to increase mass. However, aging and interventions, like exercise, influence fract…
Into parallel-plate capacitor polymerization of natural drying oil film kinetics result was obtained for distinguishing of stage of the process. Into cylindrical capacitor kinetics behavior of real part of dielectric coefficient of geptan under impulse field was investigated. The behavior was connected with peculiarit…
Biogenic UO2 is being investigated as a stable waste form of uranium under anoxic conditions in contaminated aquifers. Flow-through dissolution experiments performed under reducing conditions showed that the presence of carbonate accelerated UO2 dissolution. Concomitant XPS analyses detected penta- and hexavalent uran…
Um druckbare elektrische Schaltungen herzustellen, wird ein flüssiges Ausgangsmaterial benötigt, das bei niedrigen Temperaturen zu halbleitenden Dünnschichten verarbeitet werden kann. Als ein möglicher Kandidat gelten anorganische nanopartikuläre Halbleiterdispersionen, da sie die Vorteile der anorganischen Halbleiter…
El presente trabajo aborda las fallas a monitorear, la selección de las variables y parámetros de estado de diagnóstico, el método de identificación de las fallas y el flujo de la información.Los resultados mostrados demuestran que los controles mediante Descargas Parciales (DP) son los más efectivos para el diagnósti…
Сomparative investigation results are presented of photoluminescence (PL) of a-Si/ZrO2 and a-SiOx/ZrO2multilayer nanoperiodic (5-10 nm) structures (MNS), depending on high-temperature (1000-1100 °C) annealing (HTA), hydrogenation and Si and SiOx layer thickness. MNS have been found to have an intensive PL at 400-550 n…
In this paper, by employing the previously developed two-body interatomic potentials for bismuth telluride, molecular dynamics (MD) simulations are used to describe the thermoelectric properties, namely the lattice thermal conductivity, of Bi2Te3 nanowires. Cylindrical nanowires with both smooth surface and sawtooth s…
Ce memoire est une contribution a l’etude des phases cristallines du rimonabant (SR141716). Une premiere partie traite de la caracterisation et de l’etude des stabilites relatives de deux varietes polymorphiques anhydres (par des mesures de solubilites ainsi que des experiences de conversions menees dans des solvants…
以硅酸钠(NaSiO3·9H2O)为硅源, 三甲基十六烷基溴化铵(CTAB)为模板剂在碱性条件下水热合成介孔分子筛MCM-41, 然后以其为主体, 采用锌盐浸渍-灼烧的方法, 在介孔分子筛MCM-41上负载了氧化锌(ZnO)纳米微粒, 并通过扫描电子显微镜, 红外光谱(IR), 紫外可见吸收光谱(UV-Vis), N2-吸附脱附和荧光光谱等手段对产品进行了系列表征。结果表明,分子筛平均直径约为1.7 μm, 对不同温度下灼烧后得到的ZnO/MCM-41组装体的光谱性质进行研究表明介孔分子筛MCM-41的尺寸所限, 制备出的ZnO粒子粒径小于2 nm。量子尺寸效应使得ZnO/MCM-41组装体中的ZnO纳米粒子的紫外可见吸收光谱及荧…
In this work the hardness, Young modulus and fracture toughness of micro-sized tungsten carbide particles embedded in a cobalt matrix (hardmetal) has been evaluated by means of nanoindentation. Hardness and Young modulus of these hard particles have been determined using a Berkovich tip indenter. The obtained hardness…
This work tries to study the preparation, morphology and properties of graphite nanoplatelets (GNPs) hybrid polymer nanocomposites, and explore their potential applications in areas such as electromagnetic interference (EMI) shielding. The main results are as follows: The GNPs were successfully prepared by a “chemical…
Organometallic polymers containing spirosilole unit have been interested, since spirosiloles has a unique optical and electronic properties. New functionalized spirosiloles (2,5-dibromo-3,4,6,7,8,9-hexaphenylspirosilole, DBHPSS) have been synthesized from the reduction of bis(1,1-phenylethynyl)-2,3,4,5-tetraphenylsilo…