Materials Literature
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In questo lavoro di Tesi e' stata studiata la reazione di combustione dell'H2 su una superficie catalitica ideale, ovvero platino policristallino, con l'intento di approfondire meccanismi cinetici superficiali ed interazione con fenomeni di trasporto di materia e di energia. In particolare si sono studiate le cause de…
Abstract Fibers possess properties that cannot be found in bulk materials and these are exploited in their use as reinforcements in composites. The small diameters of most of these fibers contribute to their physical properties and give them great flexibility. There exist a very wide range of synthetic fibers that can…
Abstract Fillers have played an important role in plastic and composite industries in aspects of traditional material reinforcements with higher modulus and strength, enhancements of multifunctional properties in thermal and/or electrical conductivities, heat distortion temperature, wear resistance and dimensional sta…
Abstract Ceramic laminates represent a relatively new class of materials developed to overcome the critical aspects associated with the limited mechanical resistance and reliability of monolithic ceramics. The proper design and production of laminated orthotropic structures, where fibers are introduced to act as reinf…
Abstract Composite micromechanics deals with the relationships between macroscopic properties of heterogeneous polymer matrix materials such as lamina or particulate composite and its microstructural parameters. In composite mechanics, this is the largest length scale at which structural details are considered. The pr…
Abstract In this article several examples of styrenic composites are discussed. The first example discusses glass fiber reinforcement of polystyrene that was developed in the late 1940s to enhance the modest physical properties of this commodity plastic. After this date there was a continuous evolution of styrene comp…
Abstract Linear‐condensed polyimides as composite matrices were introduced in three parts. Polycondensation processes include three categories: imide ring formed in the polymerization process, polyimide formed by the reaction of monomers possessing imide rings, and polymerization by Diels‐Alder reaction from bismaleim…
Abstract In this article, we review the essential technological aspects of weaving processes used to produce woven fabric reinforcements. The discussion incorporates selection of the appropriate types of fibers, essentials of weaving processes, and aspects of fabric design. This is complemented with a modeling strateg…
Abstract Creep is a measure of the dimensional instability of materials and is usually designated experimentally as the time‐dependent component of the strain that occurs as a result of the application of a constant stress at constant temperature. Since laboratory data are taken over a short period of time relative to…
Developing carriers of active ingredients with pre-determined release kinetics is a main challenge in the field of controlled release. In this work, we fabricate designer microparticles as carriers of active ingredients using droplet microfluidics. We show that monodisperse droplet templates do not necessarily produce…
Lithium conditioned plasma facing surfaces have lowered recycling and enhanced plasma performance on many fusion devices. However, the nature of the plasma-lithium surface interaction has been obscured by the difficulty of in-tokamak surface analysis. We report laboratory studies of the chemical composition of lithium…
Abstract Surface analysis has played an important role in the development of many advanced materials, including composites. This article describes the principles and instrumentation of the three most widely used surface analysis techniques: X‐ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and…
This paper extends a mixed oligopoly model developed by Matsushima and Matsumura (MM) into a two-dimensional space with one public firm and two private firms. By doing so, another type of equilibrium is established : In one dimension the private firms choose the same location, whereas in the other dimension they are l…
Les nanorubans de graphene (NRGs) sont des materiaux prometteurs pour l'organique electronique, a mi chemin entre polymeres conjugues et nanotubes de carbone. Deux approches differentes pour la synthese de nanorubans aromatiques sont developpees et evaluees. La premiere est fondee sur la formation de ceramidonines par…
利用高压热重?傅里叶红外联用的方法研究大同烟煤在增压富氧条件下燃料 N 的释放行为,主要考察压力对 NOx排放特性的影响.实验结果表明,压力的改变对燃料 N 的迁移转化过程影响显著.由于含氮前驱体的生成机制不同,压力升高后,其转化率变化规律并不一致.随着压力的升高,挥发分产量的增加,燃料 N 向 NO 的转化率逐渐上升.在2 MPa 以下时,由于 NO 浓度和氧分压的增加,燃料 N 向NO2的转化率逐渐升高,但在3 MPa 时,随着 NO2分解速率的加快和产量的减少,NO2的转化率有所下降.燃料 N向 NOx 的转化率随着压力升高单调增加
采用电化学沉积法制备了ZnO纳米棒, 首先讨论了电化学沉积参数对氧化锌(ZnO)纳米棒形貌的影响, 并对不同长度ZnO纳米棒的光吸收和反射等性质进行了研究. 实验发现沉积时间是影响纳米棒长度、直径的重要因素, ZnO纳米棒的微观形貌对其光学性质有重要影响. 然后以氧化锌纳米棒为n型材料, 以氧化亚铜为p型材料, 通过电化学沉积法构筑了ZnO/Cu 2 O异质结太阳能电池, 并测试了其光伏性能, 研究表明增长纳米棒阵列的长度使得开路电压、短路电流密度及光电转换效率等性能得到提升. 最后, 综合分析了氧化锌纳米棒形貌与所组装电池的性能之间的关系, 发现调控氧化锌纳米棒的形貌是提高ZnO/Cu 2 O异质结太阳能电池光伏性能的有效途径.
This paper reflects on the weldability of steel API 5L X80. The steel was delivered in a plate form, and was produced by the TMCP (Thermo Mechanical Controlled Process). FCAW (Flux Cored Arc Welding) was applied as a welding technology using three different filled wires. The flux in the wires was of rutile and basic c…
Adhesive joint is commonly used in composite pipe connection. The problem is still frequent failure, failures usually starts from the edges and propagate to the center. This is due to uneven stress distribution and stress concentration at the edge of the connection. To further believe that, in this st udy carried out…
Abstract In the frame of the space applications, the trend of looking for light weight and higher performance spacecraft structures is considered a design driver for the cost reduction and exploration applications. In commercial applications, the saving of few kilograms per pounds enable the decreasing of the fuel mas…
A eficácia do processo de produção de polihidroxialcanoatos (PHA) por culturas microbianas mistas (MMC) depende da fase de selecção de culturas. Este passo é determinante para o passo seguinte de acumulação, pois a sua optimização depende da estabilidade e da capacidade de produção da cultura seleccionada. Neste proje…