Materials Literature
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The corrosion inhibition of mild steel in one normal sulphuric acid solution by tetra methyl ammonium bromide (TMAB) has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic polarizations) techniques. The results…
We investigated the characteristics of subjects in marine leisure activities and the wearing conditions of a rash guard through a consumer survey. The questionnaire examined the number of rash guards owned by different styles, wearing size, choice of rash guard compared with ordinary clothes, and the satisfaction in a…
Electromagnetic bandgap (EBG) structures have become a favorable field of research within the microwaves, photonics, and antenna design. The unusual properties of this structure such as frequency bandgap [1], in phase reflector arrays [2] and high impedances surface [3] made this structure unique. Several reports have…
전산모사를 이용하여, 자기소용돌이의 공진 주파수에 대한 두께 의존성을 조사하였다. 자기소용돌이의 공진 주파수는 2차원(2D)과 3차원(3D) 계산결과 모두 두께가 두꺼워짐에 따라 증가하는 경향을 보였다. 그러나 2D와 3D 계산 결과는 두께가 두꺼워짐에 따라 차이를 보였는데, 이는 3D 계산과 달리 2D 계산에서는 두께가 증가함에 따라 두께방향으로 발생하는 불균질한 자화 구조를 고려하지 않았기 때문이다. Using micromagnetic simulation, we investigated the effect of thickness of a nanodisk on a…
Transdermal drug delivery system has various merits compared to oral drug delivery system. Polyurethane nonwovens have been attracted as backing materials for patch and wound dressing, as they have superior stretchability and breathablility to films. The previous works on thermoplastic polyurethane nonwovens were main…
Abstract The competition between diffusion and first‐order irreversible reaction in poisoned catalysts is revisited. Two cases are considered for isothermal slab catalysts: uniform and shell‐progressive (or pore‐mouth) poisoning. Analytical concentration profiles are derived, and the implications on catalyst performan…
In the theory of diffraction gratings, the conventional integral method is considered as a powerful tool of numerical analysis. But it fails to work at a critical angle of incidence, because a periodic Green's function (integral kernel) diverges. This problem was resolved by the image integral equation in a previous p…
본 연구에서는 CoFe/MnIr 이중층 구조의 계면에 존재하는 비상보성 반강자성(AF) 스핀들에 의한 교환 결합 에너지 특성을 강자성 공명(FMR) 측정법을 이용하여 분석하였다. MnIr의 두께가 $t_{AF}$ = 0, 3 및 10 nm 재료를 열처리한 한 후 이들 재료의 FMR 신호를 측정하였으며, $t_{AF}$ = 0 nm 재료를 기준으로 하여 $t_{AF}$ = 3 및 10 nm 재료의 교환 바이어스 자기장( $H_{ex}$ )과 회전 이방성 자기장( $H_{ra}$ )을 도출하였다. $300^{\circ}C$ 에서 열처리한 재료의 경우, $H_{ex}$…
Ferromagnetic resonance and X-ray specular reflectivity measurements were performed on $Ni_{81}Fe_{19}/Ir_{20}Mn_{80}/Co_{90}Fe_{10}$ exchange bias trilayers, which were grown using the pulsed-DC magnetron sputtering technique on Si(100)/ $SiO_2$ (1000 nm) substrates, to investigate the evolution of the interface roug…
During a reactor normal operation, two parallel 50% capacity cooling pumps circulate primary coolant to remove the fission reaction heat of the reactor through heat exchangers cold by a cooling tower. When one pump is failure, the other pump shall continuously circulate the coolant to remove the residual heat generate…
Nanocomposite films of poly(ethylene terephthalate)(PET) and nano titania( $TiO_2$ ) were prepared by melt compounding with a twin-screw extruder followed by hot pressing for the purpose of investigating antibacterial activity. FE-SEM, EDS and XRD measurements confirmed that nano $TiO_2$ was successfully dispersed at…
It is generally known that electrochemical impedance spectroscopy is a powerful technique and its real-time application has been demanded for prompt observations on instantaneous electrochemical changes. Nevertheless, long measurement time and laborious analysis procedures have hindered development of it. Solving the…
본 연구에서는 blocked isocyanate와 하이브리드 기술을 이용해서 1액 경화형 폴리우레탄 탄성체를 제조하였다. 1액 경화형 하이브리드 폴리우레탄의 제조를 위해서 hydroxyl group을 포함하는 실리카 하이브리드를 합성하고 입자크기, 형태 및 탄성체 내의 하이브리드 입자분포를 확인하였다. 또한, 열해리특성, 기계적 물성, 성형특성을 조사하였다. 1액 경화형 폴리우레탄 탄성체의 열해리 특성을 평가한 결과 온도가 높을수록, 열처리 시간이 길어질수록 blocking된 isocyanate의 해리가 더 잘 진행되었다. 합성된 실리카 하이브리드는 직경이 23~2…
The use of Solid Oxide Fuel Cell (SOFC) has created various interest in many parties, due to its capability to convert gases into electricity. The main requirement of SOFC cell components is to be produced as thin as possible to minimize the losses of electrical resistance, as well as able to support internal and exte…
The amorphous NdCoxOy nanowire arrays have been successfully fabricated using anodic aluminium oxide (AAO) membrane templates by suction filtration at subatmospheric pressure (SFSP). The morphology and chemical composition of NdCoxOy nanowires were characterised by a scanning electron microscope, a transmission electr…
Applying an external electric field across air filter media is one of methods to improve the filtration performance. Metal wire meshes have been commonly used as electrodes situated on both sides of a thick filter pad. For a thin filter medium a short circuit, known as the biggest drawback for applying an external ele…
In this paper, by using a metal-insulator-semiconductor Schottky-diode structure, we examined the electrical and hydrogen-sensing properties of radio frequency sputtered LaTiON thin films that had been annealed at four different temperatures (450°C, 550°C, 650°C, and 750°C). Characterization of their morphological sur…
The effects of Si content on the variation of microstructure and processing window of austempered ductile cast iron were investigated. Four different Si contents between 2.42 and 3.37 wt.% were used. The influence of silicon on the microstructure and processing window of these materials were studied. Austenitizing was…
One of the calcium aluminate, 12CaO·7Al2O3, was synthesized from calcium sulfite hemihydrate waste which was produced as a by-product of calcium polysulfide. The calcium sulfite waste was at first pre-treated by sodium salts, Na2CO3 and Na2C2O4. Then, the waste was converted to the CaCO3 and CaC2O4, respectively. From…
We report on the basis of experiments that magnetic domain structures exhibit a transition between single and dendrite domains with respect to the width of ferromagnetic nanowires. This transition is directly observed in CoFe/Pt multilayered nanowires having a width in the range of 580 nm to 4.2 µm with a magnetic for…