Materials Literature
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This paper analyzes the dynamic behaviour of a 5 kW fuel cell system based on planar co-flow Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) stack, with internal reforming. The system is composed by the SOFC stack, a combustor of the cell exhausts, two heat exchangers for fuel and air preheating and the relat…
STM light emission (STML) has been shown to be a promising technique for nanometer scale analyses of electronic states of molecules on metals as the light emission due to the electronic transition between molecular levels is comparably intense with the plasmon induced light emission for noble metals. The energy forbid…
The US Government’s 2008 International Energy Outlook forecasts global energy consumption of nearly 700 quadrillion British thermal units (BTUs) in 2030, a worryingly high figure compared to the 462 quadrillion BTUs consumed in 2005.1 Therefore, the need to resort to cleaner and more abundant sources of energy is urge…
The influence of hydrothermal treatments on the chemical composition of intercellular matrix regions of kenaf fibers was investigated. The treatment using the hot stream of water vapor was more effective to dissolve hemicellulose fractions as compared with the treatments in hot pressurized water. On the contrary the d…
This article was published in the journal, Transactions of the Institute of Metal Finishing [© Maney Publishing] and is available at: http://maney.co.uk/index.php/journals/imf/
Amorphous carbon film (a-C:H) applications, such as hard disks, require films with nanometer thicknesses. In an indentation test, the obtained hardness values of these films are affected by substrates. On the indentation tests, we studied the effect of substrate hardness on films less than 200 nm in thickness. a-C:H a…
Discos de ao ABNT H13 foram nitretados por plasma pulsado numa atmosfera 20% N 2 e 80% H 2 , temperatura de 400C em diferentes tempos: 1 h, 4 h, 9 h, 16 h e 36 h. Estes discos foram testados num tribmetro para simular o desgaste por deslizamento. Para isto, foi utilizada uma esfera de Si 3 N 4 de 7,14 mm de dimetro e…
Graphite is widely used as a major internal structural material in high temperature gas-cooled reactors (HTRs). In order to evaluate service lives of graphite components, both the fast neutrons and temperature distributions inside the reactor core are required as input data for the irradiation-induced stress analysis.…
In this study, the thermal transport issues for a nanocomposite material used in the blow molding process are addressed in the fabrication of the composite mold. For low production cycles, there is a significant interest in using lower cost composite molds to replace the expensive traditional metal molds used for maki…
Erosion due to solid particles has a detrimental effect on the performance of components used in many critical applications. The problem becomes more acute at high temperatures. Thermal sprayed ceramic coatings are widely used in such situations wherein the present scenario considers better coatings. The ceramic compo…
Since the demonstration of the first organic field-effect transistor (OFET) in the early 1980s,1 organic semiconductors have been seen as an alternative to conventional inorganic microelectronics for various low-end applications. Properties such as solution processability allow organic semiconductor devices to be fabr…
If an interaction between phases of different composition at an interface is significant, the classical model of an interface is no longer satisfactory.In such cases, the transition layer has to be modeled as a surface phase with intrinsic non-local properties.The boundary of separation, which defines the interface, m…
In this work, a low hysteresis surface prepared by hierarchical textures for the reduction of liquid droplet adhesion is proposed. This surface is important to provide a platform for droplet-based biological reactions with minimum surface interferences. The hierarchical textures, mimicking lotus leaf surface, were com…
在柴油机结构不做改动的情况下，基于燃烧示功图的分析，定量研究了甲醇含量对燃烧压力、压力升高率、燃烧放热规律和循环变动量的影响。结果表明：甲醇的含量越大，滞燃期越长；燃烧压力和最大压力升高率均增大且出现的位置后移，其中燃用M15最大压力升高率接近0．45MPa／℃A；累积放热率达到95％时，燃用柴油为上止点后55℃A，燃用M5和M10为上止点后53℃A，燃用M15为上止点后57℃A，位置差别不大。甲醇含量增加，柴油机循环变化量增大，燃用M0的Covpmi为1．61％，燃用M10的Covpmi为1．82％，燃用M15的Covpmi为3．32％。
A variety of ZnO belt-like structures were synthesized by the heat treatment of ZnS substrates with Ga droplets in the air, and their morphological and structural properties were investigated. Three types of ZnO belts with flat surfaces of ±(2110), ±(1100) and ±(1213) were obtained. As comparison, the ZnO crystal grow…
This paper serves as an investigation into the response of the NASA space shuttle wing in the event of a debris impact during launch. The explicit finite element method is used to model the leading edge of the shuttle wing and the event of impact with a piece of a material from the shuttle's external tank. The results…
In this paper, theoretical analysis on the efficiency of using periodic waveguiding structures in mid-infrared spectral range (MIR) is reported. The structures are fabricated in bulk of highly nonlinear glass by the femtosecond (fs) pulse processing. This research covers the following: calculation of guided modes and…
The transient behaviors of the dipole coupling with surface plasmons in an Ag/dielectric grating structure for understanding the characteristics of those dipole-coupling features are demonstrated. The major decay mechanisms of those coupling features are identified.
In order to suppress generation and growth of whiskers, the effect of laser irradiation on tin-electroplated film on copper was studied by scanning electron microscopy and X-ray diffraction method. In the case of as-plated film, whiskers were generated on the electroplated tin film of 1 μm thickness within 432 ks. Res…
In order to simulate the behavior of a thermal protection system exposed to a sudden heat flux it was necessary to develop a model of the thermal degradation of the insulating foam. The model was based upon measured mass losses, Thermal Gravimetric Analysis (TGA) data. Models can range from the simplest one chemical r…