Materials Literature
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The researches on the development of composite material propeller with outstanding damping effects have been actively attempted for the reduction of radiation noise of underwater vehicle propeller. Composite material suitable for the flexible propeller has the following advantages, such as high specific strength and s…
The reliability of engine valve springs is a very important issue from the point of view of warranty. This paper presents a combined experimental and statistical analysis for predicting the fatigue limit of high tensile engine valve spring material in the presence of non-metallic inclusions. Experimentally, Fatigue te…
The performance characteristics of a commercial lean-NOX trap catalyst were evaluated between 200 and 500°C, using H2, CO, and a mixture of both H2 and CO as reductants before and after different high-temperature aging steps, from 600 to 750°C. Tests included NOX reduction efficiency during cycling, NOX storage capaci…
A fundamental problem in the development of automotive thermal protection strategies is the understanding of the effect of time and temperature on vehicle components life and their performance throughout the life of the vehicle. Due to restrictions on emissions and the stringent requirements for improved fuel economy,…
This study was aimed at determining the numbers of bacteria and fungi in the floats of main soaking, liming, deliming-bating, degreasing and pickling stages. To this end, the numbers of total aerobic mesophilic, proteolytic, lipolytic and aerobic spore-forming bacteria and, the numbers of total aerobic fungi (yeast an…
Abstract Calcium scaling problem in production tubular is the most widespread among flow assurance problems. Well intervention in every 3-4 months are common to combat calcite deposition and rapid production decline. In order to minimize the formation of scale deposits, threshold scale inhibitor treatment with polycar…
We describe the photochemical characteristics of two phosphorescent palladium diselenolenes [Pd(2)(Se(2)C(8)H(12))(2)(PBu(3))(2)] (1) and [Pd(2)(Se(2)C(8)H(12))(2)(PPh(3))(2)] (2) which, to the best of our knowledge, are the first reported examples of luminescent Pd-Se compounds. Both compounds exhibit broadband near-…
Metamaterial has been developed using a structure of Cu-wire coil wound on a ferrite core. The metamaterial has greatly enhanced azimuthal permeability, as compared to the mere core material, and its resonance frequency can be controlled through varying the number of turns of the coil. These special properties, which…
Nitrocarburizing is an economical surface hardening process and is proposed as an alternative heat treatment method to carbonitriding. The focus of this study is to compare the size and shape distortion and residual stresses resulting from the ferritic nitrocarburizing and gas carbonitriding processes for SAE 1010 pla…
This paper describes the development of an engineering analysis tool that assesses the life of vehicle components, after exposure to heat. As a standard engineering practice, each component or part of a component has a “long term” and a “short term” temperature goal based on the part’s material physical properties. At…
Future diesel emission control systems have to effectively operate under non-conventional low-temperature combustion engine operating conditions. In this work the research and development efforts for the realization of a Multi-Functional catalyst Reactor (MFR) for the exhaust of the upcoming diesel engines is presente…
A Mg-5.0wt.%Al-2.0wt.%Ca alloy (AC52) was cast at different cooling rates varying from 0.5 to 65 °C/s. The dendrites was characterized by determining the secondary dendrite arm spacing (SDAS) and the volume fraction of secondary eutectic phases with the linear intercept and point counting methods, respectively. The SD…
Abstract Ag9I(GeO4)2 was obtained for the first time by reacting a stoichiometric mixture of Ag2O, AgI, and GeO2, at elevated oxygen pressures, adding a small portion of distilled water. The synthesis was done at 480 °C and 110 MPa of oxygen pressure. It crystallizes in space group C2/m, with the unit cell dimensions…
The lost foam casting process (LFCP) is a near-net shape casting process. This process is the most energy efficient casting process available. “Foundry Management and Technology” magazine analyzed the lost foam process and reported a 27% energy savings, a 46% improvement in labor productivity and 7% less material usag…
A realistic representation of water molecules is important in molecular dynamics simulation of proteins. However, the standard method of solvating biomolecules, that is, immersing them in a box of water with periodic boundary conditions, is computationally expensive. The primary hydration shell (PHS) method, developed…
Abstract Calcium and iron ions are commonly observed in treated waters. Their carbonate salts are widely found in production lines of separation plants and gas and oil wells. Extensive studies have been made on calcium carbonate salts. On the other hand, little attention has been paid to ferrous iron carbonates and ir…
This paper describes a new catalyst powder structure that inhibits the sintering of the precious metals used in emission control catalysts even under vehicle aging conditions and keeps their particle size in the single-digit nanometer range. This catalyst powder structure consists of a support material for stabilizing…
Presented are analytical and experimental results for both the conventional trimming process and a recently developed robust trimming process, which involves dulling the upper trimming tool and providing elastic offal support. The robust process, which has strong potential to lower the requirements for the accuracy of…
Difference of engine combustion characteristics, species and amount of exhaust gas and PM (particulate matter consisted of SOF and Soot and Ash), and especially PM oxidation characteristics were studied when diesel fuel or bio-fuel, here PME (palm oil methyl ester) as an example, was used as a fuel. The fueling rate w…
The effects of vacancies on the strength and elastic constants of silicon, such as Young's modulus and Poisson's ratio are investigated using the molecular dynamics simulations with the Stillinger–Weber potential. The defected crystalline cells contain randomly generated defect distributions in the simulation models.…