검색결과

검색조건
좁혀보기
검색필터
결과 내 재검색

간행물

    분야

      발행연도

      -

        검색결과 1,072

        721.
        1986.12 구독 인증기관 무료, 개인회원 유료
        Rhizobium의 Nitrogenase 생성요인(生成要因)과 감염기작(感染機作)을 구명(究明)하고 배양세포(培養細胞)와 Rhizobia의 혼합배양(混合培養)에서 질양고정계(窒養固定係)를 확립(確立)하기 위(爲)하여 황금(黃金), 남천(南川), D68-0099등(等) 세 품종(品種)을 조직배양(組織培養)한 결과(結果)는 다음과 같다. Callus 형성능(形成能)은 배(胚)와 유근(幼根)에서는 양호(良好)하나 배축(胚軸)에서는 전혀 없었으며 2mg/ 2,4-D, 4mg/ NAA에서 가장 양호(良好)하고 2,4-D/Kinetin 조합농도(組合濃度)에서는 0.2mg(2,4-D)/과 0.05mg(Kinetin)/에서 가장 이상적(理想的)이었다. 배양세포(培養細胞)의 성장(成長)에는 2,4-D 2mg/와 2,4-D (0.2mg/)/Kinetin(0.05mg/)일 때가 가장 양호(良好)하며 R. japonicum 019, 011을 접종(接種)하였을때 배양세포(培養細胞)의 성장(成長)은 상당히 둔화되었다. 단일(單一) 아미노산은 배양세포(培養細胞)의 성장(成長)을 저해(沮害) 하였는데 황금(黃金)의 경우 Methionine, Leucine에서 저해(沮害)가 가장 컷으며 다른 아미노산의 첨가(添加)로 저해작용(沮害作用)이 상당히 회복되었다. 부정근(不定根)의 생성(生成)은 2,4-D 2.0mg/에서나 0.2mg/ 2, 4-D/0.05mg/ Kinetin에서 양호(良好)하였다. 배양세포(培養細胞)-Rhizobium의 친화(親和)에 의(依)한 질소고정력(窒素固定力)은 25개(個) 사용(使用) 균주중(菌株中)에서 황금(黃金)에서는 10개(個) 균주(菌株), 남천(南川)에서는 7개(個) 균주(菌株)에서 나타났으며 D68-0099에서는 전혀 나타나지 않았으며 황금(黃金)의 경우(境遇) 85-HG-1 019, 007, 남천(南川)에서는 007, 119등(等)이 높은 활성(活性)을 나타내었다.
        4,000원
        723.
        1981.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        수도 주요해충 벼멸구의 내충성품종선별방법을 개발하기 위하여 방사성동위원소 P-32를 이용한 섭식량과 식이선호성과의 관계를 조사중 다음과 같은 결과를 얻었다. 1. 식이선호에 의한 벼멸구의 선호도와 P-32 섭식량간에는 밀접한 관계가 있었다. 2. 엽기 수도유묘를 표식할 때는 P-32의 비방사능이 가 되게 하고 처리방법은 근부를 24시간 이상 침적시킨 후 공시충은 48시간 흡즙시키는 것이 품종간차이를 비교하기 용역하였다. 3. 내충성 검정시 공시충은 성충을 이용하고 웅충보다 자충을 이용하는 것이 흡즙량의 차이가 커서 비교하기가 편리하였다.
        4,000원
        724.
        1978.08 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        4,000원
        725.
        1975.12 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        A new technique of photographic observations is developed for the determination of time of minimum light of eclipsing binary. An instrumental system to accomplish the observation is described. With this instrument the atmospheric extinction coefficients in Seoul are observed, and four times of minimum light for Algol and W UMa are determined.
        4,000원
        726.
        1975.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        쇠파리의 난과 3-5일령 및 7-9일령 용에 X-선을 조사시켜 부화율, 우화율을 조사하였으며 또한 3-5일 영용에 X-선을 조사시켜 우화된 성충의 불임유기선량에 대한 실험결과를 다음과 같이 얻었다. 1. 란부화율은 약 300R 조사시 이었으며 3-5일영 및 7-9일영 번데기에 대한 사충율의 회귀직선은 Y=2.665x+2.301, Y=4.36x_0,18이고 중앙치사선량은 11.5KR과 12.6KR이었다. 2. 3KR 조사웅충과 정상자충에서 산란된 란은 약 가 미부화되었다. 그러나 2.KR 조사자충과 정상웅충 사이에서 산란된 란은 가 부화되지 않았다. 3. 불임유기선량은 자충이나 웅충과 같이 4KR이면 완전할 것으로 보며 선량을 고려할 때 충분히 이용가능할 것으로 본다.
        3,000원
        727.
        1973.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        1. 침파리의 동계사육 결과 평균온도 에서 유충기간 7일, 용기간 9.2일, 전산란기간 14.2일, 성충수명 23.3일이었다. 2. 5월부터 7월까지 사육온도 로 고정시켰을 때의 생육기간은 유충기간 8.0일, 용기간 5.3일, 전산란기간 11.7일, 성충수명 30.1일 이었다. 3. 용 개체중량은 5월-7월의 에서 13.3mg으로서 현저한 증가를 볼 수 있었다. 4. 전산란 기간중의 성충사망율은 습도 조절(R. H.)에 따라서 큰 차이를 보여주었으며 누대사육을위해서는 의 R.H.를 유지할 필요가 있을 것으로 본다. 5. 성충의 산란율은 산란 시작후 제8-10일에 제일 높다.
        3,000원
        728.
        1973.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        1) 쇠파리의 누대 실내사육을 위한 온도는 약 가 좋으며, 이때 유충기간은 약 6.8일, 용기간은 5.3일, 산란전기간은 10.4일, 성충의 수명은 약 30일이었다. 2) 인공사육에 있어서 용화율은 우화율은 였으며 성비는 1 : 1이었다. 3) 용의 체중량은 약 14.5mg이었으며, Wheat bran medium 보다 Standard medium이 사육성적이 좋았다. 4) medium 125gr에 대한 난의 접종수는 약 310개가 가장 적합하였다. 5) rectangular cage를 사용할 경우, 성충의 resting place는 가 적합할 것으로 본다.
        4,000원
        729.
        1973.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        갈색엽고병(Fusarium niwate)의 효과적인 접종방법을 찾아내기 위해 본 시험을 수행하였던 바 다음과 같은 결과를 얻었다. 1) 본 균의 분생포자의 증류수 현탁액을 벼 유묘에 분무접종할 때, 접종 후 습실에 1일 보존했을 경우에는 거의 발병이 되지 않았으나 2일간 보존한 겅우에는 어느 정도 병반이 나타났다. 2) 벼 유묘에 바람이나 또는 나무막대기로 물리적인 상처를 입힌 다음 증류수 포자현탁액을 분무한 결과 상당한 병만이 형성되었다. 3) 포자현탁액에 벼 잎 추출액, glucose, polypeptone, yeast exract 등의 용액을 첨가 분무접종했을 때 병반형성이 양호하였다. 4) 포자발아상태는 종류수중에서는 불량하였으나 영양분을 첨가한 용액중에서는 발아력도 좋았고 균사의 융합도 양호하게 일어났다. 5) 본 접종시험의 결과 통일품종은 재래 장려품종인 풍광에 비해 본 병에 대해 약했다.
        4,000원
        730.
        1971.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        이화명충의 유충, 번데기, 성충에 gamma ray를 조사하여 웅성불임기술에 관한 자료를 얻기위한 실험결과를 요약하면 다음과 같다. 1) 번데기의 성비는 암컷 2,903에 대해 숫컷은 2,924이었다. 2) 번데기의 은 암컷이 26KR, 숫컷이 26.7KR이었다. 3) 처리한 숫컷성충과 교미한 암컷의 평균 산란수는 고선량일수록 감소하며 난괴수는 증가하였다. 4) 숫컷의 은 23KR이었으며 30KR 이상에서는 거이 불임이 유기되었다. 5) 웅성불임을 유기 시키기 위하여 방사선을 조사시키는 시기는 번데기 시기가(3-6일령) 가장 적합하다고 본다
        3,000원
        734.
        2023.11 서비스 종료(열람 제한)
        Wolsong Unit 1, a domestic heavy water reactor nuclear power plant, was permanently shut down in December 2019. Accordingly, Wolsong Unit 1 plans to prepare a Final Decommissioning Plan (FDP), submit it to the government by 2024, receive approval for decommissioning, and begin full-scale decommissioning. One of the important tasks in the decommissioning of Wolsong Unit 1 is to determine the decommissioning strategy. It is necessary to decide on a decommissioning strategy considering various factors and variables, secure the technical background, and justify it. The selection of a decommissioning strategy is best achieved through the use of formal decisionmaking assistance techniques, such as considerations related to influencing factors. It is very important to understand the basic decommissioning strategy alternatives and whether sufficient consideration has been given to situations where only a single unit is permanently shut down in a multi-unit site like Wolsong Unit 1, while the remaining units are in normal operation. As a process for selecting a decommissioning strategy, first, all considerations that could potentially affect decommissioning presented in the KINS Decommissioning Safety Review Guidelines were synthesized, influencing factors to be used in the decision-making process were determined, and the concept was defined. In order to select the most appropriate decommissioning strategy by considering various evaluation attributes of possible decommissioning alternatives (immediate dismantling and delayed dismantling), the Wolsong Unit 1 decommissioning strategy was evaluated by reflecting the AHP decision-making technique.
        735.
        2023.11 서비스 종료(열람 제한)
        Domestic commercial low- and intermediate-level radioactive waste storage containers are manufactured using 1.2 mm thick cold-rolled steel sheets, and the outer surface is coated with a thin layer of primer of 10~36 μm. However, the outer surface of the primer of the container may be damaged due to physical friction, such as acceleration, resonance, and vibration during transportation. As a result, exposed steel surfaces undergo accelerated corrosion, reducing the overall durability of the container. The integrity of storage containers is directly related to the safety of workers. Therefore, the development of storage containers with enhanced durability is necessary. This paper provides an analysis of mechanical properties related to the durability of WC (tungsten carbide)-based coating materials for developing low- and intermediate-level radioactive waste storage containers. Three different WC-based coating specimens with varied composition ratios were prepared using HVOF (high-velocity oxy-fuel) technique. These different specimens (namely WC-85, WC-73, and WC-66) were uniformly deposited on cold-rolled steel surfaces ensuring a constant thickness of 250 μm. In this work, the mechanical properties of the three different WCbased coaitng materials evaluated from the viewpoints of microstructure, hardness, adheision force between substrate and coating material, and wear resistance. The cross-sectional SEM-EDS (Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy) images revealed that elements W (tungsten), C (carbon), Ni (nickel), and Cr (chromium) were uniformly distributed within the each coating layers which was approximately 250 μm thick. The average hardness values of HWC-85 and HWC-73 were found to be 1,091 Hv (Vickers Hardness) and 1,083 Hv, respectively, while the HWC-66 exhibited relatively lower hardness value of 883 Hv. This indicates that a higher WC content results in increased hardness. Adhesion force between and substrates and coating materials exceeded 60 MPa for all specimens, however, there were no significant differences observed based on the tungsten carbide content. Furthermore, a taber-type abrasion tester was used for conducting abrasion resistance tests under specific conditions including an H-18 load weight at 1,000 g with rotational speed set at 60 RPM. The abrasion resistance tests were performed under ambient temperatures (RT: 23±2°C) as well as relative humidity levels (RH: 50±10%). Currently, the ongoing abrasion resistance tests will include some results in this study.
        736.
        2023.05 서비스 종료(열람 제한)
        Radioactive Oxide is formed on the surface of the coolant pipe of the nuclear power plant. In order to remove the oxide film that is formed on the surfaces of the coolant pipe, chemical and physical decontamination technologies are used. The disadvantage of traditional technologies is that they produce secondary radioactive wastes. Therefore, in this study, the short-pulsed laser eco-friendly technology was used in order to reduce the production of secondary radioactive wastes. It was also used to minimize the damage that was caused to the base material and to remove the contaminated oxide film. The study was carried out using a Stainless steel 304 specimen that was coated with nickel-ferrite particles. Additionally, a transport robot was 3D modeled and manufactured in order to efficiently remove the oxide film from the coolant pipe of the nuclear power plant. The transport robot has a fixed laser head to move inside the horizontal and vertical pipes. The rotating laser head removes the contaminated oxide film on the inner surface of the coolant pipe. In the future, as a condition of the 1064nm short-pulsed laser ablation technique determined by basic analysis, we plan to analyze whether the transport robot is applicable to the radiation contamination site of the nuclear power plant.
        737.
        2023.05 서비스 종료(열람 제한)
        The purpose of this study was to examine whether galvanic corrosion of copper occurs by inserting a third barrier layer with a higher corrosion potential than copper between copper and cast iron when the copper layer is locally perforated by pitting or partial corrosion. A triple layer composed of copper, inserted metal, and carbon steel was manufactured by cold spray coating of inserting metal powders such as Ag, Ni, and Ti on carbon steel plate followed by Cu coating on it. First, the corrosion properties were evaluated electrochemically for each metal coating. As a result of Tafel plot anaylsis in KURT groundwater condition, the corrosion potential of Fe (-567 mV) was much lower than that of Cu (-91 mV), and the corrosion potential of Ni (-150 mV) was also lower than that of Cu. Therefore, Ni was likely to corrode before Cu. However, the corrosion current of Ni was lower than that of the Cu. In the galvanic specimen where the copper and inserting metal were exposed together, Cu-Fe was much lower corrosion potential of -446 mV, and the corrosion potential of Cu-Ti, Cu-Ni, and Cu-Ag were slightly higher than that of Cu. Therefore, it seemed that Ag, Ni, and Ti all might promote galvanic corrosion of surrounding copper when the copper layer was perforated to the inserted metal layer. If the metal insertion presented in this study operates properly, the disposal container does not need to worry about the partial corrosion or non-uniform corrosion of external copper layer.
        738.
        2023.03 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        APro, a modularized process-based total system performance assessment framework, was developed at the Korea Atomic Energy Research Institute (KAERI) to simulate radionuclide transport considering coupled thermal-hydraulic-mechanicalchemical processes occurring in a geological disposal system. For reactive transport simulation considering geochemical reactions, COMSOL and PHREEQC are coupled with MATLAB in APro using an operator splitting scheme. Conventionally, coupling is performed within a MATLAB interface so that COMSOL stops the calculation to deliver the solution to PHREEQC and restarts to continue the simulation after receiving the solution from PHREEQC at every time step. This is inefficient when the solution is frequently interchanged because restarting the simulation in COMSOL requires an unnecessary setup process. To overcome this issue, a coupling scheme that calls PHREEQC inside COMSOL was developed. In this technique, PHREEQC is called through the “MATLAB function” feature, and PHREEQC results are updated using the COMSOL “Pointwise Constraint” feature. For the one-dimensional advection-reaction-dispersion problem, the proposed coupling technique was verified by comparison with the conventional coupling technique, and it improved the computation time for all test cases. Specifically, the more frequent the link between COMSOL and PHREEQC, the more pronounced was the performance improvement using the proposed technique.
        739.
        2022.10 서비스 종료(열람 제한)
        Recently, it is being carried out the project to evaluate the properties of materials harvested from nuclear reactor after the decommissioning of Kori Unit 1. However, it is not sufficient adequate machining equipment and remote machining technique to perform the projects for evaluation of materials harvested from nuclear reactor. Thus, it is required to develop the remote machining technique in hotcell to evaluate the mechanical properties of nuclear reactor materials. The machining technique should be performed inside a hotcell to evaluate mechanical properties of materials harvested from nuclear reactor and is essential to prevent radiation exposure of workers. Also, it is essential to design the apparatus and develop the machining process so that it can be operated with a manipulator and minimize contamination in hotcell. In this research, development of remote specimen machining technique in hotcell such as machining apparatus, technique and process for compact tension specimens of material harvested from nuclear reactor are described. Remote machining technique will be useful in specimen machining to evaluate changes in mechanical properties of materials harvested in high-radioactive reactor. Also, it is expected that various types of specimens can be machining by applying the developed machining technique in the future.
        740.
        2022.10 서비스 종료(열람 제한)
        The hydro-mechanical behavior of rock mass in natural barriers is a critical factor of interest, and it is mainly determined by the characteristics of the fractures distributed in the rock mass. In particular, the aperture and contact area of the fractures are important parameters directly related to the fluid flow and significantly influence the hydro-mechanical behavior of natural barriers. Therefore, it is necessary to analyze the aperture and contact area of fractures distributed in potential disposal sites to examine the long-term evolution of the natural barriers. This study aims to propose a new technique for analyzing the aperture and contact area using the natural fractures in KURT (KAERI Underground Research Tunnel), an underground research facility for the deep geological disposal of high-level radioactive waste. The proposed technique consists of a matching algorithm for the three-dimensional point cloud of the upper and lower fracture surfaces and a normal deformation algorithm that considers the fracture normal stiffness. In the matching process of upper and lower fracture surfaces, digital images obtained from compression tests with pressure films are used as input data. First, for the primary matching of the upper and lower fracture surfaces, an iterative closest point (ICP) algorithm is applied in which rotation and translation are performed to minimize the distance error. Second, an algorithm for rotation about the x, y, and z axes and translation in the normal direction is applied so that the contact area of the point cloud is as consistent as possible with the pressure film image. Finally, by applying the normal deformation algorithm considering the fracture normal stiffness, the aperture and contact area of the fracture according to the applied normal stress are derived. The applicability of the proposed technique was validated using 12 natural fractures sampled from KURT, and it was confirmed that the initial apertures were derived similarly to the empirical equation proposed in the previous study. Therefore, it was judged that the distribution of apertures and contact areas according to applied normal stress for laboratory-scale fractures could be derived through the technique proposed in this study.