Materials Literature
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Abstract Process modifications of the gas quench sequence for low pressure carburized gears can increase the performance of up to 22 %, compared to direct gas quenching. Several test series were made with different interruptions of the gas quenching sequence, near the martensite start temperature M s . The quench inte…
In order to improve the corrosion resistance of an aluminum alloy powder (aluminum–copper–iron), a traditional sol–gel process (tetraethoxysilane [TEOS] was used as the precursor) was carried out in accordance with orthogonal experiments (L9(34)) in the first step. Solvent, reaction temperature, molar concentration of…
This paper focuses on the dynamics and control of piezoactuators (PEAs) for high-speed large-range scanning applications. Firstly, the nonlinear hysteresis is modeled by using a modified Maxwell resistive capacitor (MRC) model. Secondly, an inverse-based feedforward controller is proposed for this application with hys…
Results of theoretical and experimental investigations of the nonlinear mechanism of Rayleigh-wing formation during the four-wave mixing process in suspensions are presented. The developed theory shows that simultaneous action of two laser radiations with different wavelengths on a spherical particle in a viscous liqu…
친환경 소재인 폴리프로필렌카보네이트(PPC)를 포장소재로서 응용하기 위하여 가로세로비가 큰 박리흑연 EFG(exfoliated graphite)를 이용하여 함량을 달리한 6종류의 PPC/EFG 나노복합필름을 제조하였다. 제조한 나노복합필름의 수분흡수 거동을 gravimetric method를 이용하여 측정하였으며, 나노복합필름의 수분에 대한 화학적 친화성(chemical affinity)과 모폴로지(morphology) 변화를 이용하여 해석하였다. 필름 내로의 수분확산 거동은 박막의 불균일성에도 불구하고 Fickian diffusion model에 잘 부합하였으며,…
Background and Objectives: Increasing waste tiers production has made the recycling of this solid waste a critical issue in the world. On the other hand, it seems contamination of groundwater to the petroleum pollutant like gasoline is a great threat to the health of societies in developing countries. The main objecti…
Anthropogenic release of carbon dioxide and atmospheric carbon dioxide have reached record levels. One path towards CO2 reduction is to utilize renewable energy to produce electricity. Another, less explored, path is to utilize renewable energy to directly produce societal staples such as metals, bleach, fuels, includ…
Many fire tests have been developed to evaluate the flammability performance of a lining material. According to the test methods, specimens are usually mounted vertical as a wall or horizontal as a floor. The only exception is the ISO 9705 room corner test in which ceiling material is installed beneath a ceiling. This…
The substituted Y type hexaferrites (where = 2, 4, 6, 10) are prepared by standard ceramic technique. The infrared absorption spectra of the prepared compounds are studied in the range 400 cm−1 to 4600 cm−1. These spectra are used to locate the vibrational ranges due to substituted cations with the nearest oxygen laye…
We report a study of the topological Hall effect (THE) in Fe-doped MnSi and compare it with results from pure MnSi under pressure. We find that Fe doping increases the THE, indicating an enhancement of the magnitude of the emergent gauge field. This is consistent with the concurrent reduction in the length scale of th…
We find that small particles (∼1 nm) of solid argon are densely precipitated in a Pd40Ni20P20 metallic glass matrix after argon ion-beam irradiation with an accelerating voltage of 4 keV. This is in sharp contrast to the case of noble-gas implantations into crystalline metals, for which high-energy beam (50–300 keV) h…
본 연구는 공침법으로 Ti가 첨가된 Mn-Cu 혼합산화물을 이용하여 $200^{\circ}C$ 이하의 저온 영역에서의 $NH_3$ -SCR 반응특성에 관한 것이다. 제조된 촉매들은 BET, XRD, XPS, TPD를 이용하여 각각의 물리/화학적 특성을 분석하였다. Mn-Cu 혼합산화물은 매우 큰 비표면적과 저온에서의 높은 SCR 효율을 나타내었으며, Ti가 첨가된 경우 상대적으로 높은 SCR 효율과 $N_2$ 선택도를 나타내었다. 이러한 결과는 Ti가 첨가됨에 따라 화학 흡착된 산소종( $Me-O_{ads}$ )이 증가하여 NO가 $NO_2$ 로의 산화가 촉진되고,…
Work-function-adjustable Ti m Si n O x provides an opportunity to optimize the energy-level alignment at the active/cathode interface in the polymer bulk heterojunction solar cell.
원자력발전소의 2차 계통수 중에 존재하는 철산화물(magnetite)은 열전달 튜브의 표면에 침착(fouling)되어 열전달 성능을 떨어뜨리거나 부식을 유발한다. 이와 같은 문제를 방지하기 위해, 원전 2차 계통수 중에 고분자 분산제(polymeric dispersant) 주입을 통해 철산화물의 분산 안정성 향상을 도모하는 연구를 수행하였다. 카르복실기(-COOH, carboxyl group)를 함유한 3종의 음 이온성 고분자(PAA, PMA, PAAMA)를 선정하였으며, 이들에 농도변화(1~1000 ppm)에 의한 마그네타이트 분산 특성을 평가하기 위해 침강시험,…
Failures of pre-stressed steel caused by hydrogen embrittlement as a consequence of chloride-induced corrosion are well known in the civil engineering field. In 1995, a wire-type reference electrode was proposed to monitor pre-stressed tendons corrosion potential, claiming that, once a pit occurs in any position on th…
This article presents an overview of the textile industry highlighting major processes, techniques and practices that are used to make textile industry more sustainable. There is an essential need to identify the stages in various steps of textile production that are said to be the greatest cause for environmental deg…
The conductive layer of emeraldine base polyaniline (PANI) thin film coated on silicon has successfully tested for ammonia. The bulk PANI powder was synthesized by oxidative polymerization of aniline using ammonium peroxidisulfate in an acidic medium and dissolved in N-methyl pyrrolidone (NMP) for coating the thin fil…
Corrosion behavior of anodic oxide layers on the surface of TiAlZr alloys formed using glycerol + 15 vol% H2O + 0.2 M NH4F under variable anodizing voltage (15 V, 30 V) was investigated and compared with corrosion of the native films. Electrochemical behavior analysis of all samples was composed of linear polarization…
This article presents the development of a pavement management system (PMS) for the town of Christiansburg, VA, and the effectiveness of pavement management applications as a decision support tool. Researchers worked with personnel from the town of Christiansburg to gather inventory data and past work history on all o…
The purpose of this study is to improve the cooling performance of single and cascade refrigeration systems using thermoelectric modules. The system consists of a heat sink, fan, and thermoelectric module. The operating parameters considered in this study include power distribution between the first- and second-stage…