Materials Literature
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본 연구에서는 황마 단섬유 강화 폴리유산을 코어 폼으로 하고 연속 유리 섬유 강화 폴리유산을 외곽 스킨으로 하는 샌드위치 패널 구조의 황마 단섬유 강화 폴리유산 복합재료를 제작하였고, 황마 섬유 무게 비에 따른 복합재의 굽힘 특성을 관찰하였다. 코어 폼의 밀도는 0.31-0.67 g/cm3 기공함량비는 0.51-0.71이었다. 최대 굽힘강도는 황마 섬유 무게비 12.5 wt.%에서 92.7 MPa, 최대 굽힘 탄성계수는 황마 섬유 무게비 30.0 wt.%에서 7.58 GPa으로 측정되었다. 경제성 분석을 실시했으며 적용 부재의 굽힘 강도를 향상시키기 위한 비용은 황…
최근 개발된 새로운 전극재료 중 철화합물 재료는 천연으로 많이 존재하고 있어 낮은 단가로 리튬이온전지의 양극재료로 많은 연구가 진행 중에 있다. 철원자가 터널을 구성하는 프레임워크를 결합한 터널형 구조를 나타내는 β-FeOOH는 구조 붕괴 가능성이 낮아 안정된 구조를 가지고 있어 충방전 싸이클 동안 리튬이온의 층간 삽입과 추출에 대한 좋은 게이트를 제공하여, 높은 방전용량을 갖는 재료로 알려져 있다. 따라서 본 연구의 목적은 수열합성법으로 리튬이온이차전지의 양극재료로써 적합한 입자의 형상 및 크기를 갖는 β-FeOOH nanorods을 제조하고, 이를 전기화학적 특…
In printed electronics the use of semiconducting silicon nanoparticles allows more than the simple printing of conductive materials. It gives the possibility of fabricating robust and inexpensive, active components. This work presents the design, fabrication, and characterization of Schottky barrier diodes using silic…
Poly(3-hexylthiophene) (P3HT) is an organic semiconductor material that is widely studied in the photovoltaics and transistor fields of research. The polymer exhibits a relatively high charge carrier mobility when the molecules are ordered in a crystalline way. In this case the material exhibits a fibril-like morpholo…
Представлен лазерно-ультразвуковой метод и средство измерения остаточных напряжений с наклонным оптико-акустическим преобразователем - лазерно-ультразвуковой дефектоскоп модели УДЛ-2М. Приведены результаты экспериментальных исследований изменения скорости распространения ультразвуковых волн в образцах из стали при исп…
Resistenza alla termo-ossidazione; UHMWPE; nanoparticelle multifunzionali ibride
Предложен способ послойного определения концентрации водорода в титане при использовании вихревых токов разной частоты. Описана методика использования стандартного образца и схема измерений для конкретных технических ситуаций.A method of layerwise determination of hydrogen content in titanium at use of different frequ…
Existen diferentes mecanismos físicos que actúan en la columna de agua y que facilitan la migración de larvas de invertebrados meroplanctónicos desde la plataforma continental hasta la costa. Estos factores físicos juegan un rol importante en el asentamiento de larvas en ambientes intermareales. El presente trabajo ev…
Ceramics are frequently used in special mechanical parts due to high wear resistance and corrosion resistance. In particular, deposition with plasma heat source produces particularly excellent wear resistance, corrosion resistance, and thermal stability. For plasma coating materials, Al2O3 and TiO2 ...
The nuclear power plant Atucha I is a pressurized heavy water reactor, that possesses two independent shutdown systems to stop the nuclear fission chain reaction: control rods fall down and the fast inyection of boric acid in the moderator tank. This second shutdown system (TJ) has three independent hydraulic systems…
In this work it was carried out an investigation by Raman spectroscopy, of the vibrational modes of the magnesium molybdate MgMoO4 subjected to high pressures up to 8.5 GPa, and lithium molybdate Li2MoO4 - in two experiments – up to the limits of 5.0 and 7.0 GPa, respectively. The analysis of the spectra obtained for…
학위논문 (박사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2014. 2. 이창희.
The application of natural fibers as reinforcement in polymer composites has been continuously growing during the last few decades. These composites find diverse applications in hostile environment where they are exposed to external attacks such as solid particle erosion. Also, in many respects, the mechanical propert…
copolimero stirene-butadiene-stirene; nanotubi di carbonio; morfologia
L'obiettivo di questo lavoro è stato lo sviluppo di un metodo CE (Capillary Electrophoresis) per \nla determinazione della purezza enantiomerìca del farmaco neurolettico atipico levosulpiride (S- \nSUL), ai fini del controllo di qualità della forma farmaceutica. Per sviluppare tale metodo sono \nstati seguiti i princi…
The aim of this study is to understand the mechanism for the production of photocatalyst nano-particles of specific shape and size for CO2 conversion into liquid fuel and to investigate the photocatalyst. Carbon dioxide is one of the primary green house gases causing Earth's global warming effect.
Quantum calculations via the first-principles study using the density functional theory (DFT) have offered great opportunities to describe the origin and most fundamental properties of new materials. In addition, detailed properties of the materials can be visualized by providing an accurate view at the atomic level.…
Cellulose is an environmentally friendly material which is obtainable in vast quantities, since it is present in every plant. Cellulosic fibers are commercially found in two forms: natural (flax, hemp, cotton, sisal, wood, etc.) and regenerated cellulose fibers (RCF). The biodegradability, the morphological and mechan…
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Talc, one of the most important industrial minerals, is commonly used as filler in paint, plastic & cosmetics and also used to give product extra properties due to its soft and layered, hydrophobic structure and high oil adsorption. In this study, effects of dry grinding on surface properties (contact angle & surface…