• Title/Summary/Keyword: tray

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Contamination of an Alcyon Co-60 Gamma rays by Electrons (Alcyon Co-60 감마선의 전자오염)

  • Yoo Meong-Jin;Kim Dong-Won;Kim Chul-Soo;Chung Woon-Hyuk
    • Radiation Oncology Journal
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    • v.6 no.1
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    • pp.109-116
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    • 1988
  • The Alcyon Co-60 gamma rays was studied for electron contamination. The surface dose, attributable almost entirely to contamination electrons, has a linear dependence on field width for square fields and an inverse square dependence on distance from the bottom of the fixed head assembly Build-up and surface dose measurements were taken with and without an acrylic blocking tray in place. Further measurements were made with a copper filter designed to reduce secondary electrons emitted by photon interactions with the acrylic tray. The results are discussed in relation to skin sparing effect for radiation therapy Patients. And to achieve the maximum skin sparing effect, the selection of the optimum SSD and TSD is needed.

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Simulation Model for Drying Characteristics of Batch-type Tunnel Dryer (배치식 터널 건조기의 고추 건조 시뮬레이션 모델 연구)

  • 황규준;고학균;홍지향;김종순
    • Journal of Biosystems Engineering
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    • v.25 no.2
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    • pp.89-96
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    • 2000
  • In this study, experiments were performed for various drying air temperatures, air flow rates tray distance to analyze drying characteristics of batch type tunnel dryer. In comparison of tunnel drying with cabinet drying which is currently used in the farm, the results of drying simulation model of cabinet dryer was used and then the possibility of applying the drying simulation model of cabinet dryer to batch type tunnel dryer was investigated. The results showed that as the drying temperature increased, the drying rte and moisture difference in the direction of air flow increased and as the air flow rate increased, the drying rate increased and moisture differences decreased. In tunnel dryer, drying through bottom of the tray had large effect on drying rate and the effect was more significant when the drying temperature increased. As air flow rate increased, the difference of drying rates between tunnel and cabinet drying increased and drying rate of tunnel of drying was higher. The drying simulation model could estimate moisture content in tunnel more precisely by using modified effective moisture diffusion coefficient for air flow rate.

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Valve Tray for Large Volume Gas Treatment (대용량의 가스상물질 처리를 위한 밸브트레이)

  • 김재홍;김장호
    • Journal of environmental and Sanitary engineering
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    • v.16 no.1
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    • pp.61-65
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    • 2001
  • To review mass transfer trays from a process of view, the dependence of efficiency in loading ranges and maximum loadings with an acceptable efficiency of traditional tray have to be known. It is reported about the performance of the metallic Dualflex, relatively new high performance packing. Absorption, desorption and rectification tests as well as pressure drop and maximum capacity are concerned, indicate the superiority of the Dualflex over the general packing of comparable, main process. The process engineering characteristics show that Dualflex can be applied for all mass transfer precesses and it is to be recommended especially for those high capacity separations which requite allow low pressure drop because of the thermal sensibility of the product or because of the need of energy saving.

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Noise Estimation in a Passenger Compartment and Trunk Coupled System by Using the Vibro-Acoustic Reciprocity (진동-음향 상반성을 이용한 차실-트렁크 연성계의 소음평가)

  • 이진우;이장무;김석현;박동철
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.6
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    • pp.178-185
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    • 2001
  • This paper describes the correlation between the interior noise and the trunk wall vibration. Using the vibro-acoustic reciprocity, effect of the trunk wall vibration on the compartment noise is investigated on a medium size car. In the low frequency range, vehicle interior noise is dominated by several acoustic modes of the passenger compartment and the vibration modes of the surrounding shell parts. Especially, vibration of the trunk wall radiates sound and it is transferred through holes on the package tray into the passenger compartment. This paper experimentally reveals that sound can be well produced at some particular vibration modes of the trunk lid and it strongly influences the compartment noise through package tray holes. Contributions of the trunk walls to the interior noise are estimated by measuring the acoustic-structural transfer function, based on the vibro-acoustical reciprocity theorem.

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Influence of Molten KNO3 Flow Conditions on Mechanical Properties during Fabrication of Chemically-Toughened Glass

  • Kim, Dong-Hwan;Maeng, Jee-Hun;Kim, Dami;Choi, Sung-Churl;Kim, Hyeong-Jun
    • Journal of the Korean Ceramic Society
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    • v.52 no.2
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    • pp.137-139
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    • 2015
  • In this study, we examined the influence of molten $KNO_3$ flow on mechanical properties and their deviation when a chemical toughening process was applied to soda lime silicate glass ($Na_2O-CaO-SiO_2$). $KNO_3$ melt flow was controlled using three methods: (1) glass tray rotation, (2) impeller stirring, and (3) natural convection. DOL and hardness were found to be enhanced by tray rotation because this rotation was able to maintain the concentration around the glass surface, in contrast to other methods. However, there did not appear to be a statistically significant difference in the 3-point bending strength for the three flow conditions due to the ground edge condition.

SAMHYUN (업체탐방 - 삼현CNS(주))

  • Son, Yeong-Seon
    • Electric Engineers Magazine
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    • s.333
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    • pp.48-49
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    • 2010
  • 삼현CNS(주)는 1997년 5월 설립되어 FAN TRAY, 정류기 개발 기술을 기본으로 다양한 기술 집약형 특수용도의 전원공급부에 필요한 안정화 장치와 서지보호기를 공급해 한국전력, 수자원공사, 발전회사, KT 등으로부터 높은 기술력과 제품력을 인정받고 있다.

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A COMPARATIVE ANALYSIS OF THE ACCURACY OF IMPLANT IMPRESSION TECHNIQUES BY USING STRAIN GAUGE (Strain gauge를 사용한 임플랜트 인상법의 정확도 비교)

  • Han, Eu-Taek;Kim, Yung-Soo;Kim, Chang-Whe
    • The Journal of Korean Academy of Prosthodontics
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    • v.33 no.3
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    • pp.539-549
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    • 1995
  • The purpose of this study was to determine the accuracy of 3 implant impression methods by using strain gauge. The models used for this study were partially edentulous mandibular acrylic resin casts Model A, with two abutment analogs in #46,47 extraction site, represented two implant parallel to to the adjacent natural tooth. Model B represent an anterior implant parallel to the adjacene natural tooth and a posterior implant exhibiting a 15-degree lingual inclination. Master framework were fabricated on the master model, and 3 strain gauges were attached to a master framwork to determine the passivity of fit of the framework to sample casts made by the three impression techniques. The master framework was attached to each sample cast with gold screws, which were tightened with the torque driver to ensure a consistent toque application of 10 Ncm. Universal Digital Measuring System UCAM-5BT was used for strain measuring. Impression techniques studid were : 1. unsplinted tapered impression coping, polyvinyl siloxane, stock tray 2. unsplinted squared impression coping, polyether, custom tray 3. squared impression coping splinted with Duralay resin, polyether, custom tray Through analysis on data from this study, the following conclusions were obtained. 1. There were no statistically significant differences between the mean strain recorded from the sample casts made with the tree impression. But only strain values of model A(parallel group) Y-axis was signifcantly differed between Technique 1 and 3(P<0.05). 2. There was no statistically significant difference between model A(parallel group) and model B(15-degree divergent group).

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