• Title/Summary/Keyword: E-beam

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Evolution Properties of a Partially Coherent Flat-topped Vortex Hollow Beam Propagating in Uniaxial Crystals Orthogonal to the Optical Axis

  • Liu, Dajun;Wang, Guiqiu;Luo, Xixian;Yin, Hongming;Wang, Yaochuan
    • Journal of the Optical Society of Korea
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    • v.20 no.6
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    • pp.686-693
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    • 2016
  • The analytical expressions for a partially coherent flat-topped vortex hollow beam propagating in uniaxial crystals orthogonal to the optical axis are derived, and the intensity and coherent vortex properties of partially coherent flat-topped vortex hollow beam propagation in uniaxial crystals orthogonal to the optical axis are analyzed by numerical examples. The influence of beam order parameter N, topological charge M, the coherence length and the ratio of refractive indices $n_e/n_o$ of uniaxial crystals on the normalized intensity distribution and coherent vortex of a partially coherent flat-topped vortex hollow beam propagating in uniaxial crystals are discussed in detail.

Composite aluminum-slab RC beam bonded by a prestressed hybrid carbon-glass composite material

  • Rabahi Abderezak;Tahar Hassaine Daouadji;Bensatallah Tayeb
    • Structural Engineering and Mechanics
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    • v.85 no.5
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    • pp.573-592
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    • 2023
  • This paper presents a careful theoretical investigation into interfacial stresses in composite aluminum-slab reinforced concrete beam bonded by a prestressed hybrid carbon-glass composite material. The model is based on equilibrium and deformations compatibility requirements in and all parts of the strengthened beam, i.e., the aluminum beam, the slab reinforced concrete, the hybrid carbon-glass composite plate and the adhesive layer. The theoretical predictions are compared with other existing solutions. Numerical results from the present analysis are presented both to demonstrate the advantages of the present solution over existing ones and to illustrate the main characteristics of interfacial stress distributions. It is shown that the stresses at the interface are influenced by the material and geometry parameters of the composite beam. This research is helpful for the understanding on mechanical behaviour of the interface and design of the hybrid structures.

E- beam 증착법으로 증착된 Sn/In 박막의 전기적/광학적 특성 비교

  • Jang, Dong-Sik
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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    • pp.283-283
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    • 2012
  • Sn/In은 금속 특징상 semimetal로 구분되어 지며 증착 두께가 적을수록 Island 구조를 가지며 높은 저항을 가져 비전도 특성을 가지는 금속으로 알려져 있다. 이런 특성이 산업적으로 IT기기의 Decoration에 적용되어 Sn/In을 증착하여 비전도(NCVM: Non Conductive Vacuum Metallization) 증착 Inmold Film으로 활용되고 있다. 비전도 특성은 IT기기의 안테나 성능에 영향을 주기 때문에 Sn/In 박막의 두께에 따른 전기적 특성을 관찰하였다. 또한 Sn/In의 증착 두께에 따라 Inmold Film의 증착감 및 색상 차이가 발생하는 것을 색차계를 통하여 확인할 수 있었다. Sn/In 증착은 Source를 이용하여 Electron beam 방법으로 PET/증착프라이머 Film 위에 Sn/In 박막을 증착 하였으며 증착 조건에 따라 Sn/In 박막특성에 미치는 영향을 연구하였다. 그리고 SEM측정을 통하여 증착조건에 따른 박막의 Morphology도 확인하였다.

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The Fabrication of the 0.1$\mu\textrm{m}$ NMOSFET by E-beam Lithography (E-beam lithography를 이용한 0.1$\mu\textrm{m}$ NMOSFET 제작)

  • 유상기;김여환;전국진;이종덕
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.1
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    • pp.61-64
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    • 1994
  • The NMOSFET with gate length of 0.1$\mu$m is fabricated by mix-and-match method. In this device, the electron beam lithography is used to form the gate layer, while other layers are formed by the stepper. The gate oxide is 7nm thick, and the device structure is normal LDD structure. The saturation Gm for gate length of 0.1$\mu$m is 246mS/mm. The subthreshold slope is 180mV/decade for 0.1$\mu$m gate length, but the slope is 80mV/decade for 0.3$\mu$m gate length.

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Electrical and Dielectric Properties of MgO Thin Films Prepared through Electron-Beam Deposition

  • You Yil-Hwan;Kim Jung-Seok;Hwang Jin-Ha
    • Journal of the Semiconductor & Display Technology
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    • v.5 no.1 s.14
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    • pp.51-55
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    • 2006
  • MgO thin films were prepared through electron-beam deposition onto ITO-coated glass substrates in order to measure electrical, dielectric, and microstructural properties. Design of experiments was performed in this study with the aim to understanding of the effects of processing variables, e.g., substrate temperature and filament current of an e-beam evaporator statistically. Leakage currents, relative dielectric constants, and diffraction intensities of MgO thin films were analyzed statistically, following the analysis procedure provided in the design of experiments. The leakage current level of MgO thin films has been found to be statistically significant at the level of $\alpha=0.1$.

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Cu(In,Ga)$Se_2$ Absorber Layer Prepared by Electron Beam Evaporation Method for Thin Film Solar Cell

  • Li, Zhao-Hui;Cho, Eou-Sik;Noh, Gap-Seong;Lim, Jae-Eok;Pahk, Heui-Jae;Bae, Kyung-Bin;Kwon, Sang-Jik
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1564-1567
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    • 2009
  • Cu(In,Ga)$Se_2$ (CIGS) thin films were formed using CIGS bulk by electron-beam evaporation method with an evaporation current from 20 mA to 90 mA. The experimental results showed that the chemical compositions and the properties of CIGS films varied with the different evaporation current. The Cu-rich CIGS film was deposited successfully with a band gap of 1.20 eV when the evaporation current was 90 mA.

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Steel-concrete composite bridge analysis using generalised beam theory

  • Goncalves, Rodrigo;Camotim, Dinar
    • Steel and Composite Structures
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    • v.10 no.3
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    • pp.223-243
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    • 2010
  • This paper reports recent developments concerning the application of Generalised Beam Theory (GBT) to the structural analysis of steel-concrete composite bridges. The potential of GBT-based semi-analytical or finite element-based analyses in this field is illustrated/demonstrated by showing that both accurate and computationally efficient solutions may be achieved for a wide range of structural problems, namely those associated with the bridge (i) linear (first-order) static, (ii) vibration and (iii) lateral-torsional-distortional buckling behaviours. Several illustrative examples are presented, which concern bridges with two distinct cross-sections: (i) twin box girder and (ii) twin I-girder. Allowance is also made for the presence of discrete box diaphragms and both shear lag and shear connection flexibility effects.

Experimental study of beam-column joints in axially loaded RC columns strengthened by steel angles and strips

  • Adam, Jose M.;Gimenez, Ester;Calderon, Pedro A.;Pallares, Francisco J.;Ivorra, Salvador
    • Steel and Composite Structures
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    • v.8 no.4
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    • pp.329-342
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    • 2008
  • The strengthening of reinforced concrete (RC) columns by steel angles and strips (steel cage) is one of various techniques available to increase ultimate column load. Different authors have shown the influence of the beam-column joint on the behaviour of columns strengthened by steel cages. This paper presents an experimental study carried out at the Universidad Polit$\acute{e}$cnica de Valencia with the aim of analysing two different techniques to solve the strengthening close to the joint and the influence on the behaviour of RC columns strengthened steel cages. The ultimate loads obtained in the laboratory tests for these two techniques are compared to that specified by Eurocode 4.