• Title/Summary/Keyword: Thermal analysis characteristics

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The Comparison of X-ray Response Characteristics of Vacuum Evaporated $Cd_{1-x}Zn_{x}Te$ Detector (진공증착된 $Cd_{1-x}Zn_{x}Te$ 검출기의 X선 반응 특성 비교)

  • Kang, S.S.;Choi, J.Y.;Lee, D.G.;Cha, B.Y.;Kim, J.H.;Nam, S.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05b
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    • pp.39-42
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    • 2002
  • There is a renewed interest in the application of photoconductors especially Cd(Zn)Te to x-ray imaging. In this paper, We investigate effects on x-ray detection characteristic of Zn dopped CdTe detector. Cd(Zn)Te film was fabricated by vacuum thermal evaporation method and then investigate physical analysis using EPMA and XRD. We investigated the leakage current and X-ray photosensitivity as applied voltage about fabricated Cd(Zn)Te film. Experimental results showed that the increase of Zn dopped concentration in $Cd_{1-x}Zn_{x}Te$ detector reduced a leakage current and improved a signal to noise ratio significantly.

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Characteristics of Contact resistivity on RTP annealing temperature and time after Plasma ion implant (플라즈마 이온주입 후 RTP 열처리 온도와 시간에 따른 접촉저항 특성)

  • Choi, Jang-Hun;Do, Seung-Woo;Lee, Yong-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.5-6
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    • 2009
  • In this paper, plasma ion implant is performed with $PH_3$ gas diluted by helium gas on P-type Si wafer (100). Spike Rapid Thermal Processing(RTP) annealing performed for 30~60 sec from $800\;^{\circ}C$ to $1000\;^{\circ}C$ in $N_2+O_2$ ambient. Crystalline defect is analyzed by Transmission Electron Microscope(TEM) and Double crystal X-ray Diffraction(DXRD). Contact resistivity($\rho c$), contact resistance(Rc) and sheet resistance(Rs) are analyzed by measuring Transfer Length Method(TLM) using 4155C analysis. As annealing temperature increase, Rs decrease and ${\rho}c$ and Rc increase at temperature higher than $850\;^{\circ}C$. We achieve low Rs, ${\rho}c$ and Rc with Plasma ion implant and spike RTP.

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Characteristic Analysis of Bearingless SRM with Hybrid Stator Poles (Hybrid극 구조의 베어링리스 SRM 특성해석)

  • Wang, Huijun;Park, Tae-Hub;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2008.04c
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    • pp.6-8
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    • 2008
  • In this paper a novel bearingless switched reluctance motor (SRM) with hybrid stator poles is proposed. The operating principle of proposed motor is also presented. Compared with existing bearingless SRM, it has many advantages such as lower number of switches and cost, simpler control algorithm, lower thermal load. Meanwhile through finite element method (FEM) characteristics of proposed structure such as inductance, torque and radial force can be obtained. According to the FEM results, the above advantages of the proposed structure can be verified.

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Study on the Heat Flux Using Instantaneous Temperature as Height of Probe in the Combustion Chamber (연손실 순간온도 측저에 있어서 돌출높이에 따른 실험적 연구)

  • 이치우;김지훈;김시범
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.2
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    • pp.395-402
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    • 2001
  • The gasoline engine tends to high performance, fuel economy, small-sized. Therefore, it is necessary to solve the problems on thermal load, abnormal combustion, etc, in the engine, Thine film instantaneous temperature measurement probe was made. And the manufactural method of probe was established. The instantaneous surface temperatures in the constant volume combustion chamber were measured by this probe and the heat flux was obtained by Fourier analysis. The authors measured the wall temperature of combustion chamber and computed the heat flux through the cylinder wall in order to understand the combustion characteristics depending on height of probe. For achieving this goal, the thin film instantaneous temperature probe was developed for analyzing the instantaneous surface wall temperature and unsteady heat flux on the constant volume combustion chamber.

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A Study on the Thermal Characteristics of Low Temperature Vacuum Drying by Hot Water Temperature (가열수 온도에 의한 저온진공건조 열적 특성에 관한 연구)

  • 김경근;최순열
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.3
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    • pp.588-594
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    • 2001
  • The aim of this paper is to develop the low temperature vacuum dryer, with low initial investments and operating costs, easy operating method and trouble-free operation Usally operations just below atmospheric pressure, as with direct dryers, but some are built for vacuum operation with pressure as low 50 mmHg abs. The lowers the boiling point to $39^{\circ}C$ The experimental data of quantitative analysis for using practically were obtained by the constant drying rate period and reducing drying rate period according to the temperature of hot water which is the experimental parameters of present experiment. As the results, it took about 20 hours for material to reach about 18% of the final moisture content is order to store products for a long time about 450% of the early moisture content at the beginning of drying and maximum drying rate comes to about 0.30 kg/m2hr at about 350% of the moisture content.

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Analysis of Compression Ignition Combustion in a Schnurle-Type Gasoline Engine - Comparison of performance between direct injection and port injection systems -

  • Kim, Seok-Woo;Moriyoshi, Yasuo
    • Journal of Mechanical Science and Technology
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    • v.18 no.8
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    • pp.1451-1460
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    • 2004
  • A two-stroke Schnurle-type gasoline engine was modified to enable compression-ignition in both the port fuel injection and the in-cylinder direct injection. Using the engine, examinations of compression-ignition operation and engine performance tests were carried out. The amount of the residual gas and the in-cylinder mixture conditions were controlled by varying the valve angle rate of the exhaust valve (VAR) and the injection timing for direct injection conditions. It was found that the direct injection system is superior to the port injection system in terms of exhaust gas emissions and thermal efficiency, and that almost the same operational region of compression-ignition at medium speeds and loads was attained. Some interesting combustion characteristics, such as a shorter combustion period in higher engine speed conditions, and factors for the onset of compression-ignition were also examined.

Thermal Analysis of Rotary Kiln Incinerator of Municipal Solid Waste (로타리 킬른형 도시 쓰레기 소각로의 전열해석)

  • 박상일;박영재
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.6
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    • pp.2100-2108
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    • 1991
  • A hear transfer model was developed to calculate the temperature distribution in the rotary kiln incinerator of municipal solid waste. The thermo-gravimetric characteristics of waste and the gas-to-waste heat transfer coefficient were determined by comparing the experimental results and model prediction. With this, heat transfer rates by existing heat transfer mechanisms were calculated to be compared each other. The effects of treatment capacity, calorific value of waste, and flow rate and temperature of combustion air on the temperature distribution in the rotary kiln incinerator were predicted by the model developed in this work.

Development of Motorcycle Brake Design Aided Program for Thermal Analysis (모터사이클 브레이크의 열변형 해석을 위한 지원 프로그램의 개발)

  • 박시형;강석현;이성수
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.134-139
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    • 2002
  • Motorcycle industry, for its competitive position, depends on part design technology. This part design has a bulky amount of data and asks the accumulation of advanced technical skill and experience, and fragmentary technical application is not enough to get to the kernel of a problem. Therefore, the improvement of proper productivity - the starting point of engineering design - and useful Design Methodology for products manufacturing are needed. Thus this paper is aimed to create a program that outputs dynamic characteristics of a vehicle when the data from fully understanding on motorcycle's brake system and induced formula for brake design are inputted.

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Synthesis of Acrylic Pressure-Sensitive Adhesive by Emulsion Polymerization (유화중합에 의한 수성 아크릴계 접착제의 합성)

  • Kim, Dong-yeub
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.1
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    • pp.45-50
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    • 2006
  • In order to analyse the properties of the fiber-adhesive that was used as Flocking process we synthesized quaterpolymer with the variation of the types of monomer ratio by emulsion polymerization. We characterized the properties of this adhesive: Differential Scanning Calorimeter(DSC), Thermogravimetry Analysis(TGA), Raman spectroscopy. The polymer was synthesized by changing the using amount of 2-EHAM, and then we investigated the characteristics of glass transition temperature(Tg), melting temperature(Tm), thermal stability and hydroxyl group respectively. The optimum monomer composition was 36.84% EAM, 15.79% MAM, 42.1% 2-EHAM and 5.26% AAc.

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Structural Design on the Vacuum Chamber of Electron Beam Welding System (전자빔 용접기 진공 작업실의 구조설계)

  • Lee, Young-Sin;Ryu, Chung-Hyun;Seo, Jung;Han, Yu-Hee
    • Laser Solutions
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    • v.1 no.1
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    • pp.11-17
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    • 1998
  • The electron beam welding system has the advantages of the high power density, narrow welding section, and small thermal distortion of a workpiece. Recently, the electron beam welding system is widely used to the airplane engineering, nuclear power plant, and automobile industry. In the present paper, the structural analyses on the vacuum chamber of the electron beam welding system are performed by the F.E.M. analysis. The stiffening characteristics on the geometric shape, stiffener height and stiffener span are investigated. The deflection of the stiffened vacuum chamber under pressure is minimized by longitudinal and transverse stiffeners which are continuous in both direction.

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