• Title, Summary, Keyword: 방사성분해

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복합성유의 고속방사에 있어서 섬유구조형성(III) - PET/PE 복합의 효과 -

  • 김경효;조현혹
    • Proceedings of the Korean Fiber Society Conference
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    • pp.211-214
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    • 1998
  • 복합섬유의 용도는 그 기능에 따라서 다양하지만 그 중에서도 자기접착성을 살려서 부직포의 재료로 사용되는 예가 많다. 즉 sheath/core형 복합섬유 중 sheath 성분에 core 성분보다 융점이 낮은 폴리머를 사용하여 열융합에 의한 접착제로서의 역할을 담당하게 한 섬유가 전형적이다. 한편, 고속방사법은 방사과정 중에 섬유의 구조 형성을 현저하게 진행시키는 방사법이지만[1, 2], 복합섬유의 고속방사에 있어서는 각 구성성분이 서로 영향을 미치면서 세화ㆍ고화가 진행되므로 개개의 폴리머를 단독으로 방사하는 경우와는 다른 구조형성기구가 관여하는 것으로 알려져 있지만 아직 명확한 상호작용은 보고된 바가 없다. (중략)

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초임계 이산화탄소를 응용한 개질 제강 슬래그의 Cs 및 Co 이온의 제거 특성

  • 김민길;원휘준;현재혁;김계남;오원진;정종헌
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • pp.122-123
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    • 2004
  • 산업체에서 폐기물로 발생되는 제강 슬래그를 사용전 초임계 이산화탄소를 이용해 고온 고압에서 전처리를 통해 얻어진 제강 슬래그를 이용하여 토양 제염 후 발생하는 방사성 폐액 중에 포함되어 있는 성분 가운데 방사성이 높은 성분인 Cs 이온과 Co 이온을 제거하는데 활용함으로서 폐기물의 재활용에 의한 방사성 이온 제거 방안을 모색해 보고자 하였으며 이에 대한 연구는 환경보호 차원뿐만 아니라 폐기물 자원 회수라는 측면에서도 그 중요성이 크다고 할 수 있다.(중략)

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A Study of the Lipid Components in Egg Yolk Oil (난황유의 지질성분에 관한 연구)

  • 김종숙;고무석;최옥자
    • Korean journal of food and cookery science
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    • v.12 no.3
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    • pp.295-299
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    • 1996
  • Egg yolk oil was obtained from a roasting and Pressure egg yolks obtained from cage system, open barn system, respectively. Lipids in egg yolk oil were extracted with a mixture of chroform: methanol (2:1, v/v) and fractionated into neutral lipid, glycolipid and phospholipid by silicic aicd column chromatography. Lipid components of each fraction were determined by thin layer chromatography (TLC). The results were sum- marized as follows: lipid content of egg yolk from each cage system (A) and open barn system (B) was 31. 05% and 33.34%, and the lipid is made up of neutral lipid 76.60%, 71.23%, glycolipid 3.95%, 5.03% and phospholipids 19.45%, 23.74% respectively. Triglycerides (A: 59.3%, B: 56.3%) were the major components among the neutral lipids; monoglycerides, diglycerides, free sterols, and free fatty acids were the minor cop- monents. The major components of the glycolipids were digalactosyl diglycerides (A: 98.3%, B: 97.8%), the other components were cerebrosides. The major components of the phophoslipids were phosphatidyl choline plus phosphatidyl serine (A: 58.6%, B: 59.8%) the other components were lecithin plus sphingomyelin.

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Sound transmission loss through finite single partitions: the relative contribution of resonant transmission component (유한한 단판의 차음 성능: 공진 투과 성분의 상대적 기여도)

  • Lee Jong-Hwa;Ih Jeong-Guon
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.207-210
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    • 2004
  • 단판의 차음 성능 해석에 있어서 무한판과 유한판의 가장 큰 음향학적 차이는 유한한 경계에 의해 발생하는 정재파에 있다고 할 수 있다. 하지만, 일치 주파수 이하에서는 진동 공진이 발생하더라도 음향방사효율이 비교적 작고, 따라서, 비록 그 진동 응답이 크더라도 절대적인 음향 방사 양은 작다. 이를 근거로 대부분의 유한판 해석은 비공진 성분에 국한되어 왔으나, 특정 경우 공진 투과 성분을 무시하면 해석 결과에 오차가 발생할 수 있음이 제시된 바 있다. 본 연구에서는 유한 단판의 차음 해석에 있어서 공진 투과 성분의 상대적 기여도를 수치적 해석을 통해 알아보고, 이로부터 공진 투과 성분이 해석치와 측정치 사이의 정량적 상관도에 미치는 영향을 분석하였다.

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Radiological Safety Assessment for KAERI Incineration Plant on the Basis of Trial Burn Results (시험소각결과에 기준한 한국원자력연구소 소각시설의 방사학적 안전성 평가)

  • Yang, Hee-Chul;Kim, Bong-Hwan;Kim, Chang-Hee;Park, Won-Man;Jeong, Myung-Soo
    • Journal of Radiation Protection and Research
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    • v.23 no.2
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    • pp.109-114
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    • 1998
  • Radiological safety for the conventional operation of Demonstration-Scale Incineration Plant (DSIP) was assessed on the basis of the results of trial burns using the simulated and real radioactive wastes. Radiation dose assessments for routine releases on an annual basis as well a several severe accidental releases on a short-term basis (2h) revealed that there would be no significant environmental impact when low-level waste Is incinerated in DSIP. For semivolatile radioactive cesium species, expected emission concentrations slightly exceeded 10% of maximum permissible concentration. Removal characteristics of the bag filter for condensed-phase cesium species was investigated by the trial burns of simulated waste with inactive cesium tracer. In the off-gas before passing through bag filter, distributions of condensed cesium species in the transition size ranging between the diffusional and inertial region are less than 5%. The overall collection efficiency of the bag filter for cesium species was higher than 99.9%, showing enough decontamination capability as a primary filter for the low-temperature dry off-gas system in radwaste incineration plant.

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Determination of major and minor elements in low and medium level radioactive wastes using closed-vessel microwave acid digestion (밀폐형 극초단파 산분해법을 이용한 중${\cdot}$저준위 방사성폐기물의 성분 원소 분석)

  • Lee Jeong-Jin;Pyo Hyung-Yeal;Jeon Jong-Seon;Lee Chang-Heon;Jee Kwang-Yong;Ji Pyung-Kook
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.2 no.4
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    • pp.231-238
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    • 2004
  • The conditions are obtained for the decomposition of solid radioactive wastes, including ion exchange resin, zeolite, charcoal, and sludge from nuclear power plant. In the process of decomposing the radioactive wastes was used the microwave acid digestion method with mixed acid. The solution after acid digestion by the following method was colorless and transparent. Each solution was analyzed with ICP-AES and AAS and the recovery yield for 5 different elements added into the simulated radioactive wastes were over $94{\%}$. The elemental analysis of destructive low and medium level radioactive wastes by the proposed microwave acid digestion conditions concerning the chemical characteristics of each radioactive waste are expected to be useful basic data for development of optimal glass formulation.

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An analysis of the Sound Radiation Characteristics of the King Song-Dok Bell Using Cylindrical Acoustic Holography (원통형 음향 홀로그라피를 이용한 성덕대왕 신종의 방사음장 특성 분석)

  • Kim, Yang-Hann;Kim, Sea-Moon
    • The Journal of the Acoustical Society of Korea
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    • v.16 no.4
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    • pp.94-100
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    • 1997
  • In order to investigate the radiation of sound from the King Song-Duk bell, we measured the sound pressure around the bell at every 30$^{\circ}$ using a microphone line array which was composed of 30 microphones separated by 15cm;total number of measurement point was 360. The sound field was estimated by using cylindrical acoustic holography. The spectrum of measured sound pressure demonstrates that it is almost like white noise in the very beginning, but in 10 seconds two close frequency components(64.06Hz, 64.38Hz) remain and make a famous beating. This beating sound is often believed to make unique sound of the King Song-Duk bell. The mode shapes of that frequency components are the same except that one is rotated by 45$^{\circ}$ from the other. This phenomenon occurs at the other pairs of components are the same except ones in very high frequency range where the mode shapes are rather complex.

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Radiation Characteristics of a Circular Loop Antenna in Moving Media. (운동매질내에서의 Circula Loop Antenna의 방사특성(II))

  • 최병하
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.9 no.2
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    • pp.17-23
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    • 1972
  • In this paper, the radiation characteristics of a large circular loop antenna with sinusoidal current distribution is studded in a moving media with a constant velocity much less than the speed of light. The diameter of the circular loop antenna is comparable with or larger than wave length. In studing the radiation characteristics, vector potential for the antenna is derived and relative field pattern is plotted from the vector potentials. Finally the field patterns are compared with those of stationary media. It is found that maximum directivities are shifted to the direction of the velocity of the media, and the field intensities are decreased in that direction and increased in opposite direction by the velocity component paralell to the loop plane. It is also found that the deviations for the pattern are proportional to the velocity of the media, the frequency of the distributed current, the diameter of the loop antenna, and the daviation depends only upon the parallel component of the velocity to the loop plane.

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Quality Assurance and Control for Elemental Analysis of Air Dust by Neutron Activation Analysis (중성자 방사화분석에 의한 대기먼지 중 원소분석을 위한 품질보증 및 관리)

  • 문종화;김선하;임종명;정용삼;김영진
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.229-230
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    • 2003
  • 중성자 방사화분석법은 핵반응을 통해 생성시킨 방사성 동위원소로부터 방출되는 방사선을 검색하여 절대적으로 성분원소를 정량하는 핵분석기술(Nuclear Analytical Techniques)이다. 현재 한국원자력연구소의 중성자 방사화분석실에서는 대기환경분야 응용연구로서 수년 동안 대기분진을 채집하여 미량 성분원소를 정량하고 있으며, 방법의 유효화와 측정결과의 신뢰성을 확보하기 위하여 시료의 채집 및 준비, 원소분석, 측정결과의 검증 등 분석과정에 대한 품질관리를 수행하고 있다. (중략)

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A Study on Radiation Char acter istics of Electr ically Small Antenna for Low-VHF Band Direction Finding according to Tank Mounting Position (Low-VHF 대역 방향탐지용 소형 안테나의 탱크 장착 위치에 따른 방사특성 연구)

  • Moon, Sang-Man;Woo, Jong-Myung
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.14 no.2
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    • pp.127-134
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    • 2014
  • This paper presents a study on the radiation characteristics of low-VHF band electrically small antenna for direction finding. Firstly, it is simulated the antenna for mounting on flat ground and tank model(in 40MHz), and measured for mounting 1/10 scaled model(in 400 MHz). In case of flat ground feed at ${\phi}=0^{\circ}$, $180^{\circ}$(xz-plane), yz-plane $E_{\phi}$ (H-plane) and xz-plane $E_{\theta}$ (E-plane) radiation patterns are hemispheric omni-direction due to effect of narrow ground side. Then, in case of tank model, it is shown equally in case of the flat ground, yz-plane $E_{\phi}$ (H-plane) and xz-plane $E_{\theta}$ (E-plane) radiation patterns are hemispheric omni-direction nearly without effect of mounting position. Therefore, the suggested electrically small antenna for direction finding, in case of mounting on ground narrow side xz-plane(E-plane), is shown more stable radiation patterns as direction finding antenna.