Materials Literature
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Objective This study aimed to evaluate the occurrence of surface changes in composite resins, when subjected to surface treatment by polishing and artificial accelerated aging Methods The changes were quantified through rugosimetric analysis and Scanning Electron Microscopy. Five composite resins were used (Charisma,…
Physical properties of the composite yarn using low-melting(LM) polyester/Tencel were investigated with air-jet texturing conditions such as temperature, take-up overfeed, yarn speed and air pressure. Surface morphology, microstructure, tensile property, glossiness were evaluated. Surface morphology of a composite yar…
présenté par À ma famille.DÉDICACE iii REMERCIEMENTS Ce projet de maîtrise a été possible grâce au support et à l'aide que m'a apportée le professeur Alberto Teyssedou.Je désire le remercier pour sa grande disponibilité et pour son aide précieuse en ce qui a trait à l'élaboration et la compréhension de plusieurs modèl…
본 휘발성유기화합물인 아세트알데하이드와 MEK(methylethylketone)의 광촉매분해특성을 회분식 광반응기를 이용하여 연구하였다. 광촉매분해반응의 주요 반응변수인 아세트알데하이드와 MEK의 초기농도, 수분함량, 그리고 반 응온도의 영향을 조사하였다. 아세트알데하이드와 MEK의 광촉매 분해속도에서 어느 일정농도까지는 초기농도가 증 가할수록 증가하나, 그 이상에서는 완만한 증가형태를 보이며, 분해반응형태는 Langmuir-Hinselwood 모델이었다. 아세 트알데하이드와 MEK의 광분해반응에 있어 수분은 inhibitor 역할을 수행하였다. 그리고 아세트알데하…
Exhibited and published 50 years, the thesis about 180 conditions as a whole accounted for 12% of papers included. This place back to 100, the more...
Die vorliegende Arbeit beschreibt die Entwicklung einer fluorolytischen Sol-Gel-Route zur Darstellung nanoskaliger, ternärer Übergangsmetallfluoride der Zusammensetzungen Li3MF6, Li2MF5 und Li2MF4 mit Hinblick auf spätere Anwendungen als Kathodenmaterial für Lithiumionenbatterien. Organische Salze der Übergangsmetalle…
Η παρούσα διπλωματική εργασία εκπονήθηκε με σκοπό τη σύνθεση και το χαρακτηρισμό ζεόλιθου ZSM-5 και τη χρήση του για τον καθαρισμό υδατικών διαλυμάτων από βλαβερές για το περιβάλλον οργανικές ενώσεις μέσω της προσροφητικής του ικανότητας. Πιο συγκεκριμένα, η σύνθεση του ζεόλιθου ZSM-5 πραγματοποιήθηκε χρησιμοποιώντας…
The thermo catalytic decomposition (TCD) of methane at 823-973 K was investigated over unreduced 30 wt% Ni/Al2O3 and Ni/SiO2 catalysts. The catalytic activities of the unreduced catalysts were compared with those obtained for the catalysts pre-reduced with H2. Methane decomposition was studied by the thermogravimetric…
첨가제(윤활제 및 산화방지제)와 용융혼합 조건(온도, 시간 및 로터 속도)이 폴리프로필렌(PP) 기반 WPC(wood polymer composite)의 기계적 특성에 미치는 영향을 조사하였다. WPC는 용융혼합 후 압축성형하여 제조하였다. 용융혼합 과정을 이해하기 위해 WPC 용융혼합물의 토크 변화를 측정하였다. 말레산무수물로 개질된 폴리프로필렌을 상용화제로, 나노점토를 보강재로 각각 사용하였다. WPC의 기계적 특성을 측정하기 위해 UTM과 충격시험기를 이용하였고 색차계를 이용하여 WPC의 용융혼합 조건에 따른 변색을 측정하였다. 기계적 특성 분석에 따른 최적용…
우리나라는 폐기물의 에너지화를 통해 기후변화와 에너지 부족 문제를 극복하려고 하고 있으며, 폐기물을 에너지화하려는 지속적인 노력에 따라 폐기물 소각처리가 점차 확대되고 있다. 이에 따른 폐기물 소각에서의 온실가스 배출량은 점차 증가할 전망이다. 따라서, 본 연구에서는 열 회수를 통해 열과 전력을 생산하는 생활폐기물 소각장을 대상시설로 선정하였다. 대상시설로 선정된 폐기물 소각발전시설에서 배출되는 온실가스 배출량을 산정하기 위한 방법을 모색하고, 온실가스 배출량 및 배출계수를 산정하였다. 대상시설에서의 CO₂ 배출농도는 평균 6.99%로 나타났으며, 이를 온실가스 배…
니켈 촉매 상에서 에탄의 수증기 개질 반응과 수성가스 전환반응 반응에 대한 반응속도 데이터를 얻기 위하여 반응온도와 반응물의 분압을 변화시키면서 반응 실험을 수행하였다. 반응속도 데이터를 사용하여 거듭제곱 속도식 모델(power law kinetic model)과 랭미어-힌쉘우드 모델(Langmuir-Hinshelwood model)의 매개변수를 구하였다. 또한 반응 속도 모델식을 적용하여 PRO/II를 이용한 공정 모사를 통해서 에탄의 수증기 개질 반응기 사이징(sizing)을 수행하였다. 에탄을 반응물로 하여 수증기 개질 반응을 수행한 결과, 단순한 거듭제곱 속…
In the present study, the age-hardenability at intra-oral temperature of various Au-Cu-Zn alloys containing Ga, Ti, Sn, Cr was evaluated by means of hardness test and X-ray diffraction (XRD) study after solution-treatment at various temperatures and then aging at intra-oral temperature. By the addition of Ti and Sn, t…
The coatings used in marine cargo tanks are subjected to various stresses that can shorten their service life. In this article, these stresses are identified and discussed in terms of how they can contribute to coating failure. All currently available cargo tank coatings can be classified as organic or inorganic. Both…
This paper presents results for the establishment of criteria in the design of manufacturing tools by means of cold conformation of mechanical components made of stainless steel type 304. In addition values of hardness acquired by these pieces when they are obtained by cold working are reported. The results presented…
This paper reports the synthesis of molecular sieves similar to MCM-41 using rice husk ash as only source of silica. For comparison purposes, a standard synthesis was performed using aerosil 200 commercial silica. The rice husk silica was obtained by heating treatment at 600 ºC and leaching for 2 h in reflux with HCl…
2 /g respectively. An adsorption characteristic of the Polyvinyl Alcohol Supported Activated Carbon (PVAC) was analyzed with the help of pseudo first order and second order kinetic models. Both the adsorbents show maximum adsorption at a pH of 8. The pseudo second order model describes the kinetics with very high corr…
Mold filling sequence of A356 aluminum alloy was investigated with the aid of direct observation method (photography method). The results show that increase of the foam density causes decrease of the filling rate and increase of the filling time. Foam density has more pronounced effect on mold filling rate rather than…
Pyruvate kinase is a key enzyme in glycolytic pathway that catalyzes the transphosphorylation between phosphoenolpyruvate and ADP to yield ATP and Pyruvate. Geobacillus stearothermophillus has a stable pyruvate kinase with determined crystal structure that composed of four separate domains. Given that limited proteoly…
Minerais de óxidos de Mn com estrutura em túnel, hollandita (Apuí, Amazonas, Brasil, zona em prospecção) e criptomelana (Urucum, Mato Grosso do Sul, Brasil) foram isolados e caracterizados quanto à composição química, mineralógica, estabilidade térmica e morfologia. As seguintes técnicas foram utilizadas para caracter…
Considering the surface water resources as one of the main water supplies in many regions of Iran. The application of chlorination for disinfecting drinking water has increased the rate of Disinfection By- Products (DBPs) formation.The required cost for DBPS removal motivates researchers to find a solution related to…