Materials Literature
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상온 압축 성형 후 고상 반응 소결 공정을 통하여 $Mg_3Sb_2$ 소결체를 제조하고자 하였다. Mg과 Sb의 성분의 몰비와 반응온도에 따른 결정상의 변화를 조사하였다. 773~843 K에서 얻어진 고상반응 소결체들은 전형적인 $Mg_3Sb_2$ 결정상을 형성하였으나 소결체의 위치에 따라 약간 다른 상적 구성을 보였다. 소결체 하단 부위에서 전형적으로 얻어지는 결정상이 얻어졌으며 823 K 온도에서는 Mg : Sb = 3.15 : 1.85 조성일 때, 843 K 온도에서는 Mg의 몰 수가 3.10 이상인 모든 조성에서 ${\alpha}-Mg_3Sb_2$ 상과 정확…
This work reports the fabrication of a biosensing chip surface designed for plasmonic detection, and features a layer of noble metal nanoparticles encapsulated as a sandwich within amine-functionalized polysiloxane layers formed by plasma-enhanced chemical vapour deposition. The collective surface plasmon resonance (C…
In this study, the numerical simulation using AUTODYN-3D program was investigated angle trajectory prediction for inclined impacts of projectiles. The penetration and perforation of polycarbonate plate by 7.62 mm projectile was investigated numerically. The characteristic structure of the projectile's trajectory in th…
Although many studies have been done on an open-end capillary, the invasion into a closed end capillary is still novel in its investigation. In this research we have explored the fluid invasion in closed-end capillaries where the shape of the meniscus and the height of invasion were accompanied by gas compression insi…
Recently, the actuator worked by the driving recovery-force of the thermo elastic martensitic transformation of shape memory alloys(SMA) has been studied. This paper presents a study on the fatigue life of shape memory alloy (SMA) actuators undergoing thermally induced martensitic phase transformation under various st…
Swelling behaviors of polyacrylonitrile (PAN) films in various aqueous solutions, such as N,N'-dimethylformamide (DMF)/water, N,N'-dimethylacetamide (DMAc)/water, dimethylsulfoxide (DMSO)/water, NaSCN or KSCN solution, the effects of the concentrations of these solutions, and the effects of swelling temperature and ti…
본 연구에서는 단열열량계의 일종인 폭발열량 측정장치를 이용하여 레졸수지 합성반응에서 온도조절 물질이 열폭주 특성에 미치는 영향을 평가하고, 반응열과 활성화에너지 등의 속도론적 데이터를 검토하였다. 그 결과, 온도조절 물질이 투입된 낮은 고형분 농도에서는 폭주반응의 격렬함을 나타내는 순간 특성치들이 감소했다. 그러나 투입된 온도조절 물질의 갑작스런 소실은 급격한 2차 폭주반응을 촉발시켰다. 이때, 레졸수지 합성반응의 폭주반응에 의한 반응열은 페놀을 기준으로 약 157 kJ/mol이었고, 활성화에너지는 약 60 kJ/mol로 나타났다. In this study, we…
The degradation mechanisms of thermal barrier coatings (TBCs) were investigated in different thermal fatigue condition in terms of microstructural analyses. The isothermal and cyclic oxidation tests were conducted to atmospheric plasma sprayed-TBCs on NIMONIC 263 substrates. The delamination occurred by the oxide laye…
Various heat-treated and surface coating methods are used to mitigate abrasion in sliding machine parts. The most cost effective of these methods involves hard coatings such as diamond-like carbon (DLC). DLC has various advantages, including a high level of hardness, low coefficient of friction, and low wear rate. In…
Electrochemical energy-storage devices such as batteries and supercapacitors are important components in emerging portable electronic device, electric vehicle, and clean energy storage and supply technologies. This review describes recent progress in the development of nanostructured electrodes, the main component of…
The mechanical rubbing of a polyimide (PI) layer with a velvet cloth has been dominantly used to induce a uniform alignment of liquid crystal molecules in the manufacturing process of liquid crystal displays (LCDs). The rubbing process is affected by its process parameters and also by the nature and properties of the…
The purpose of this study was to verify the effect of drive swing on multiple functional wear wearing in golf. The subjects were 6 men ( $22.67{\pm}0.82$ yrs, $175.42{\pm}3.42cm$ , $78.75{\pm}4.78kg$ ), who had career each with at least 8 yers golf experience with right-hander. For kinemetical analysis, this study use…
Carbon nanomaterials such as fullerene, carbon nanotube and graphene are representative nanomaterials and widely used in various fields. Carbon nanomaterials can be exposed to environments during their production, usage and disposal, spreading to different systems and posing a great threat to various ecological recept…
발포 폴리우레탄의 변형거동을 설명하기 위해 제안된 구성방정식을 발포 폴리프로필렌에 적용하였다. 이 방정식은 7개의 매개변수를 갖고 있으며, 그중 5개의 변수는 기준 변형률속도에서 준정적 압축시험을 하여 얻은 결과를 커브 피팅하여 구하고, 나머지 두 변수는 변형률 속도를 다르게 한 준정적 압축시험으로부터 얻은 결과를 커브 피팅하여 구한다. 이렇게 구한 응력-변형률 방정식이 높은 변형률속도에서도 유효한지 알기 위해 충격시험으로부터 얻은 결과와 비교하였으며 30배와 40배로 발포된 폴리프로필렌 폼 시편에 대하여 각각 시행하였다. A constitutive equation…
Hot-dip galvanizing (HDG) is a widely used method for protecting steel against corrosion to ensure structure's life expectancy. The HDG process includes surface preparation, galvanizing, and posttreatment operations where multiple stage parameters are controlled to ensure the optimal utilization of zinc to achieve exp…
아닐린의 안전한 취급을 위해, 폭발한계는 문헌을 통해 고찰하였으며, 인화점과 발화지연시간에 의한 자연발화온도는 시험장치를 이용하여 측정하였다. 인화점의 경우 밀폐식 장치인 Setaflash와 Penski-Martens 에 의한 하부인화점은 각 각 $66^{\circ}C$ 와 $73^{\circ}C$ 로 측정되었으며, 개방식인 Tag와 Cleveland 에서는 각 각 $72^{\circ}C$ 와 $78^{\circ}C$ 로 측정되었다. ASTM E659 장치를 사용하여 자연발화온도와 발화지연시간을 측정하였고, 최소 자연발화온도는 $590^{\circ}C$ 로 측정되었…
This paper has an aim to study the effect of PWHT and its conditions(peak temperature and holding time) on the tensile properties and impact toughness of FCAW weld metal in relation to microstructure. Impact toughness was evaluated to apply the cargo tank of liquified gas carriers under the various PWHT condition of e…
The purpose of this study is to assess for scattering object for the missile ejection round due to analysis of the human body effectiveness safely. To achieve this goal the measurement method of scattering objects by comparative 2 measurement methods studied, the risk of scattering of the object is evaluated. Result o…
The aim of this study is to define the condition of optimal pre-treatment for preferable activated carbon fibers (ACFs), which are based on rayon fibers. This paper shows the ideal path of ACFs preparation process; implies that rayon fibers are pre-treated by various solvents with different times before the heating pr…
By means of numerical simulations, we explore possible effects of a special interparticle interaction potential which is a function of external and internal conditions of graphene-like systems. In addition to the electromagnetic interaction, we introduce a new potential due to the exchange of a massive scalar, associa…