Materials Literature
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In this study, waste wood powder and polypropylene were flame retardanted separately by using halogen free flame retardant for applying WPC on interior industry. For waste wood powder, it was treated by diammonium phosphate (DAP) and borax/ boric acid. For polypropylene, it was treated by ammonium polyphosphate/pentae…
The novel PM (powder metallurgy) steel for automotive power-train gear components were developed to reduce manufacturing cost, while meeting the requirements. The high-density PM steel was manufactured by mixing using special Cr-Mo atomized iron powders, high-pressure compaction, and sintering. Tensile strength, charp…
Le but de ce travail est de comparer les predictions du logiciel OOFELIE Multiphysics avec les resultats obtenus sur un banc de test afin d’en deduire des possibles ameliorations a apporter au logiciel. Pour ce faire, deux systemes optiques sont definis et modelises dans OOFELIE. Le premier se compose d’une lentille s…
Department of Energy Order 435.1, 'Radioactive Waste Management,' along with its associated manual and guidance, requires development and maintenance of a radioactive waste management basis for each radioactive waste management facility, operation, and activity. This document presents a radioactive waste management ba…
The success of continuous aluminum powder combustion with steam plasma is different from hydrocarbon ignition source. Ignition characteristics of aluminum powder with high temperature thermal plasma is studied with oxidizer-free environment. Experiment with argon plasma has same temperature conditions at 4500 K and pa…
Jüngste Entwicklungen in der Magnetresonanztomografie (MRT) ermöglichen die Darstellung von Schnittbildern des menschlichen Körpers in Echtzeit, so dass sich erstmals Operationen im MRT durchführen lassen. Ziel ist es daher, die Instrumente im MRT-Bild maßstabsgetreu darzustellen, da erst dann der Einsatz MRT-kontroll…
금속산화물을 이용한 2단계 산화/환원 반응은 GTL,CTL 의 반응원료인 합성가스 및 수소 생산기술이다.이 기술은 메탄을 환원제로 사용함으로써 비교적 저온에서 산화/환원 반응을 할 수 있는 장점이 있다.하지만 반복 사이클의 시연에서 금속산화물의 소결현상으로 인한 활성저하가 이 기술의 문제점 중의 하나이다. 본 연구에서는 2.5kW Xenon arclamp 가 설치된 solarsimulator를 사용 하였으며,무기물 다공성 폼 (SiC foam)및 유기물 다공성 폼 (Ni,Cufoam)에 CeO2/ZrO2 를 코팅하여 연속적인 합성가스 및 수소 생산 가능성을 알아보았…
Solid freeform fabrication (SFF) technology like multi-head deposition system (MHDS) were used to fabricate hybrid constructs by layer-by-layer deposition of polycaprolactone (PCL) and chondrocyte cell encapsulated alginate hydrogel. Cell dispensing conditions and optimum alginate concentration for maintaining cell vi…
N 2 O 단일추진제 추력기 시스템을 설계하기 위해 N 2 O 촉매의 분해 특성연구와 촉매의 고온 내열특성연구를 수행하였고, N 2 O 단일추진제 촉매베드의 수치적 설계를 수행하였다. N 2 O 분해반응을 위해 Pt, Ir, Ru 촉매를 선정하였고, 각각의 촉매 전구체를 함침법을 이용하여 Al 2 O 3 지지체에 담지하였다. 제조된 촉매는 관형반응기를 사용하여 공간속도와 반응온도에 따른 N 2 O 전환율을 가스분석을 통해 측정하였다. 반응실험을 통해 얻어진 반응속도를 이용하여 N 2 O 단일추진제 촉매베드의 수치적 설계를 수행하였다. 이 결과들을 바탕으로 N 2 O…
PEMFCs(proton exchange membrane fuel cells) needs humidification of reactant gases for high efficiency and long lifetime. In general, membrane humidifiers are used for this purpose. However, membrane humidifier has disadvantages of bulky volume and high cost and increases parasitic power loss of blower. To overcome th…
A dual-cooled annular nuclear fuel has been introduced for a significant increase in reactor power. The KAERI has been researching the development of a dual-cooled annular fuel for a power increase in an optimized PWR in Korea, OPR-1000. The pitch-to-diameter ratio of the annular fuel assembly is decreased in order to…
This work has investigated properties of yttrium-doped barium zirconate (BZY) disks synthesized by the solid-state reaction (SSR) method. It was found that small particles of yttria/zirconia were scattered on the surface of the sintered disks and it is suspected to be because of barium loss during the high temperature…
We derive an original method of constructing very effective near-cloaking structures for the conductivity problem. These new structures are such that their first Generalized Polarization Tensors vanish. We show that this in particular significantly enhances the cloaking effect.
A dynamic simulation study on SCR process in GTL process was carried out in order to find optimum operation conditions for pilot plant operation. Optimum operating conditions for SCR synthesis gas process were determined by changing operation variables such as feed temperature and pressure. It was also assumed that ph…
Abstract : Mature technologies for fabric shelter systems providing increased protection, improved habitability, and reduced logistics burden.
기존 국내원전의 화재 PSA는 기존 EPRI가 개발한 방법론을 이용하여 화재 PSA를 수행하여 오고 있다. 미국 NRC는 EPRI와의 공동연구를 통하여 새로운 PSA 방법론 (NUREG/CR-6850)을 개발하였고, NFPA-805 코드를 적용하는 미국 원자력발전소들에 대해서 이 방법론을 적용한 PSA를 수행하는 것을 권고하고 있다. 본 논문에서는 국내 원전의 참조 주제어실을 대상으로 신규 방법론을 적용하여 노심손상빈도 영향을 평가하였고, 국내원전에 신규 방법론 적용시 논의되어야 할 사항들을 포함하였다.
We propose a new Wet Chemical Self-Assembling Approach to form dense arrays of immobilized Single-Walled Carbon Nanotubes (SWNTs) on gold substrate. The long and randomly tangled SWNTs were chemically modified by cutting into short pipes through acid treatment where SWNTs end are terminated by Carboxyl functionalities…
In the present, the formation of shear band under a simple shear deformation is investigated using a rate-independent elastic-plastic constitutive relations. Moreover, the strain gradient terms are incorporated to obtain a non-local plastic constitutive relation, which in turn represented using combined two-back stres…
Computational modeling of micro- or nanostructure evolution is widely studied in materials engineering field. Phase field approach is a novel approach to simulate the various fields that characterize the micro- and nanostructures. Indeed, many phenomena related with the microstructure evolutions, such as a dendritic g…
A new encapsulated material [NiL2-SiO2] was prepared by direct sol-gel method. The material was characterized by fourier-transform (FTIR), proton nuclear magnetic resonance (1H NMR), ultraviolet-visible (UV-Vis), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. The characterizatio…