Materials Literature
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We report new measurements for the amplitude of sidebranches in the dendritic crystal growth of ammonium chloride from supersaturated aqueous solutions. No simple power law is found to describe either the growth of the average sidebranch amplitude or the average sidebranch envelope. Instead, the effective power law ex…
Recently a large number of research and development has been made regarding the use of Laser in welding operations, turning this process into an important tool for a variety of applications. Although it is possible to use Laser as a unique source of heat to promote union of materials, the combination of the beam provi…
During the course of this research we published 33 papers in various physics/material journals. We select four representing papers in this report and their results are summarized as follows. I. To study shear banding process, it is pertinent to know the intrinsic shear strain rate within a propagating shear band. To t…
Colangelo, Pietro. (2012). New Charmonium Spectroscopy. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/130068.
Thesis (Master, Neuroscience Studies) -- Queen's University, 2012-07-27 15:29:47.642
Solid polymer electrolytes based on poly(ethylene oxide) (PEO) and lithium trifluoroacetate (CF 3 COOLi) were prepared by a solvent casting method by different concentrations of salt.The membranes resulting of slow evaporation were analyzed by differential scanning calorimetry (DSC) and its phase diagram was drawing f…
The liquid-holding capacity of flax shive was characterized compared to three there types of biomass with five different liquids. Flax shive is. essentially a waste product of fibre recovery that is available in large quantities at low cost and has consistent composition and size characteristics. The other biomass mat…
Pumice supported Cu (II) Schiff base catalysts were prepared by surface chemical modification followed by complexation with Cu (II) acetate. The resulting materials were characterised by Diffuse Reflectance Fourier Transform Spectroscopy (DRIFTS) to confirm the modification. The materials were tested in a wet oxidatio…
6M HCl 용매 하에서 2,2'-bipyridine과 chromium(VI) trioxide의 반응을 통하여 2,2'-bipyridinium chlorochromate[ $C_{10}H_8N_2HCrO_3Cl$ ]를 합성하여, 적외선분광광도법(IR), 유도결합 플라즈마(ICP) 등으로 구조를 확인하였다. 여러 가지 용매 하에서 2,2'-bipyridinium chlorochromate를 이용하여 벤질 알코올의 산화반응을 측정한 결과 유전상수( ${\varepsilon}$ ) 값이 큰 용매 즉, 시클로헥센<클로로포름<아세톤 $p-CH_3$ , H, m-Br, $m-…
The purpose of this study is to enhance the hardenability and the mechanical properties by the addition of alloying elements such as Ni, Cr, Mo and B for the development of Cr-Mo plastic mold steel with uniform hardness and microstructure. The ingots were prepared by vacuum induction melting and forged to ${\Phi}35mm$…
A new model and resultant equation for the coagulation of acrylonitrile monomers in precipitation polymerization are suggested in consideration of the surface tension ( ${\gamma}$ ) and cohesive energy density ( $E_{CED}$ ). The equation was proven to be quite favorable by considering figure fittings from known surfac…
본 논문에서는 Guest-Host 디스플레이의 문제점인 낮은 명암대비비를 해결하기 위해서 음전하로 대전 된 흑색입자를 이용한 고성능 하이브리드 Guest-Host 디스플레이를 제안하였다. 우리는 패턴 된 전극구조의 설계로 전압에 따른 입자의 스위칭을 고려하였으며, 염료 및 입자의 혼합비를 최적화하여 전기광학특성을 향상 시켰다. 따라서 기존 Heilmeier Guest-Host 디스플레이에 비교하여 dark 특성을 80%이상 향상시켰으며, 명암대비비를 비교분석함으로써 제안 된 모드의 성능 우수성을 검증하였다. In this paper, we proposed the n…
Based on the structure feature of a tree, a cylindrical Ti 2 AlC/graphite layered composite has been fabricated through heat treating a graphite column and six close-matched thin wall Ti 2 AlC cylinders bonded with the Ti 2 AlC powders at 1300 o C and low oxygen partial pressure.SEM examination reveals that the bond i…
Al doped ZnO(AZO) thin films were deposited at different substrate temperatures by a continuous composition spread(CCS) method. Various compositions of Al doped ZnO thin films deposited at substrate temperatures between 0 and $250^{\circ}C$ were explored to find excellent electrical and optical properties. The AZO thi…
This paper presents the optical hydrogen sensor based on transparent 3C-SiC membrane and photovoltaic effect. Gasochromic materials of Pd and Pd/ $WO_3$ were deposited by sputter on 3C-SiC membrane for gas sensing area. Gasochromic materials change to transparency by exposure to hydrogen. The variations of light inten…
수소발생 및 저장 물질로서 붕수소화나트륨( $NaBH_4$ )은 촉매 분해반응을 통하여 수소를 생성할 수 있는데, 이 프로타이드 화합물을 이용하여 가정용 또는 이동용 연료전지의 수소를 공급할 수 있어서, 이 화합물과 분해반응에 대한 연구가 많이 수행되고 있다. 본 연구에서는 알칼리성 $NaBH_4$ 수용액을 귀금속이 담지된 금속산화물 촉매를 이용하여 가수분해반응을 일으키고, 그 분해반응 산물인 수소의 발생량을 측정하였다. 지지체로 사용한 금속산화물의 종류를 비교하고, 함침된 귀금속으로서 백금과 루테늄을 비교하였으며, 촉매사용량, $NaBH_4$ 용액의 농도 등의 영…
The purpose of this study is to synthesize transition metal doped mesoporous silica catalyst and to characterize its surface in an attempt to decomposition of $N_2O$ . Transition metal used to surface modification were Ru, Pd, Cu and Fe concentration was adjusted to 0.05 M. The prepared mesoporous silica catalysts wer…
Role of Ca in grain growth behavior has been investigated in hot-rolled Al-3%Mg and Al-3%Mg-0.5%Ca wrought alloys. When annealed for 1 hr from 723 to 823 K, grain size of the Al-3%Mg alloy increased rapidly above 723 K, whereas grains were relatively stable up to 773 K for the Ca-containing alloy. Grain homogeneity of…
메타 물질의 한 형태인 LHTL(Left-Handed Transmission Line)과 기존의 전송 선로 형태인 RHTL(Right-Handed Transmission Line)을 이용하여 광대역 I-Q 벡터 신호 생성을 위한 $90^{\circ}$ 커플러를 설계, 제작하고 측정을 하였다. LHTL과 RHTL 모두 커패시터와 인덕터를 이용하여 합성 전송 선로 형태로 구성함으로써, 그 크기를 최소화 하였다. 또한, 제안된 커플러 제작에 필요한 Wilkinson 전력 분배기를 합성 RHTL을 이용하여 간단하게 구현함으로써 전체 회로의 크기를 $11mm{\times}1…
The back cover picture shows the structure–affinity relationships of biphenyl antagonists of FimH, the adhesive subunit of E. coli type 1 fimbriae, analyzed by isothermal titration calorimetry (ITC). The excellent correlation between van der Waals (vdW) volumes of a series of substituents and enthalpy clearly indicate…