• Title/Summary/Keyword: equipment and materials

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Feasibility Analysis for the Introduction of Safety Certification System for Assembled Temporary Equipment and Materials (조립된 가설기자재 안전인증제도 도입의 타당성 분석)

  • Jeong, Seong Choon;Kwon, Jun Hyuk;Won, Jeong Hun;Kwon, Yong Jun
    • Journal of the Korean Society of Safety
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    • v.35 no.3
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    • pp.32-42
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    • 2020
  • In this study, in order to secure the necessity of introducing the safety certification system for the assembled temporary equipment and materials, the feasibility of the introduction was analyzed through literature review, structural analysis, and actual experiments and surveys related to the assembled temporary equipment and materials. In the previous studies, it was found that the research on the assembled temporary equipment and materials was insufficient, and it was possible to grasp the necessity of introducing the safety certification system for the assembled temporary equipment and materials. In addition, in the results of the serious accident analysis, it was found that the soundness of the temporary equipment and materials is determined by the structural characteristics after it was assembled. As a result of the feasibility analysis of the introduction of the safety certification of the assembled temporary equipment and materials through structural analysis, it is possible to effectively and rationally reflect the main geometrical influence factors, and to introduce the safety certification system that can test the procedures and procedures of the assembled temporary equipment and materials and based on it. It was found that there is a need. As a result of feasibility analysis on the necessity of introducing the safety certification system for assembled temporary equipment and materials through actual experiments, the existing single member performance evaluation has limitations in evaluating the structural performance of the assembled temporary equipment and materials. It was found that there is a need to introduce a safety certification system. As a result of gathering opinions on the feasibility of introducing the safety certification system for assembled temporary equipment and materials of manufacturers and users through the survey, it was found that the overall positive response result was high and the effectiveness was high.

Preparation of Well-Dispersed Nanosilver in MIL-101(Cr) Using Double-Solvent Radiation Method for Catalysis

  • Chang, Shuquan;Liu, Chengcheng;Fu, Heliang;Li, Zheng;Wu, Xian;Feng, Jundong;Zhang, Haiqian
    • Nano
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    • v.13 no.12
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    • pp.1850145.1-1850145.8
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    • 2018
  • In this study, a double-solvent radiation method is proposed to prepare silver nanoparticles in the pores of metal-organic framework MIL-101(Cr). The results reveal that well-dispersed silver nanoparticles with a diameter of about 2 nm were successfully fabricated in the cages of monodisperse octahedral MIL-101(Cr) with a particle size of about 400 nm. The structure of MIL-101(Cr) was not destroyed during the chemical treatment and irradiation. The resulting Ag/MIL-101 exhibits excellent catalytic performance for the reduction of 4-nitrophenol. This method can be extended to prepare other single or bimetallic components inside porous materials.

Survivability assessment of Viton in safety-related equipment under simulated severe accident environments

  • Ryu, Kyungha;Song, Inyoung;Lee, Taehyun;Lee, Sanghyuk;Kim, Youngjoong;Kim, Ji Hyun
    • Nuclear Engineering and Technology
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    • v.50 no.5
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    • pp.683-689
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    • 2018
  • To evaluate equipment survivability of the polymer Viton, used in sealing materials, the effects of its thermal degradation were investigated in severe accident (SA) environment in a nuclear power plant. Viton specimens were prepared and thermally degraded at different SA temperature profiles. Changes in mechanical properties at different temperature profiles in different SA states were investigated. The thermal lag analysis was performed at calculated convective heat transfer conditions to predict the exposure temperature of the polymer inside the safety-related equipment. The polymer that was thermally degraded at postaccident states exhibited the highest change in its mechanical properties, such as tensile strength and elongation.

Research on the application of nanocomposite materials in children's physical exercise equipment

  • Huanxiang Ding;Xueqin Wang;Xiaodao Chen
    • Advances in nano research
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    • v.14 no.3
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    • pp.273-284
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    • 2023
  • Combating the worldwide environmental threat of plastic waste pollution has become a priority. Plastic pollution has the potential to impact land, rivers, and seas, since many marine and terrestrial organisms have perished as a result of plastic's non-biodegradability and soil dangers. For this consumption, it seems required to manufacture and use new renewable resources. Renewable materials for diverse applications have been created utilizing nanotechnology, which may replace conventional materials for children's activities and sports equipment. This study investigates and suggests that nanotechnology-based materials be replaced with conventional materials to save the environment in manufacturing equipment for children's physical activities. On the basis of the mechanical sciences, a stability study of the bending behavior of small-scale structures will be performed for the various recommended materials.

A Study on the Plan for Regional Materials, Parts, Equipment Localization Promotion and Improvement of Commercialization System (지역 소재·부품·장비 국산화 촉진 및 사업화 제도개선 방안에 관한 연구)

  • Lee, Seung-Hee;Jang, Sung-Ho;Jeong, Seok-Hwa
    • Journal of the Korea Convergence Society
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    • v.12 no.2
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    • pp.279-285
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    • 2021
  • The materials, parts, and equipment industries are the backbone of the manufacturing industry and a key element of competitiveness. However, in the case of Korea, as it relies on foreign countries for core materials, parts, and equipment, it is in danger of not only industrial competitiveness, but also security. This study first looked at the outline and current address of the materials, parts, and equipment industries, identified problems and improvements, and examined the efforts and achievements so far for the localization of materials, parts, and equipment in Korea. In addition, after looking at the improvement measures for the government's material, parts, and equipment industry at the institutional level or at the ecological level, the current status and actual condition of localization of local materials, parts and equipment were investigated, and problems and improvements were analyzed. Lastly, this study presented a technology development plan for localization of parts and materials in the region and various institutional improvement plans related to commercialization.

Temperature Characteristics on Cooking Equipment Materials of Portable Gas Ranges (이동식부탄연소기의 조리기구재질에 따른 온도 특성)

  • Kim, Dae-Hyun;Lee, Keun-Oh
    • Journal of the Korean Society of Safety
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    • v.29 no.3
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    • pp.8-13
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    • 2014
  • Accidents involving portable ranges occurred total 133 cases for the last five years(2008~2012). It accounted for 18.0% of all gas accidents(739 cases). Major causes of accidents are using of excessive hot grill, leaving a butane can near fire and overheating of a butane can during cooking. In this study, it is a desire to investigate the relationship between thermal behavior mechanism depending on characteristics of cooking equipment materials of portable gas ranges. It shows that slope of temperature change curve correlates with difference of heat capacity on thermal behavior characteristics experiment depending on materials of cooking equipment. In conclusion, temperature characteristics appear differently depending on variables such as materials of cooking equipment. Especially, it is necessary to restrict using cooking equipment made of stones, because it is very dangerous that temperature of can is rapidly increasing caused by high heat capacity of stone.

Development of 20-kHz Ultrasonic Equipment for UNSM (UNSM 위한 20 kHz급 초음파 장치 개발)

  • Shin, Hyun-Geun;Kim, Hyunse;Lim, Euisu
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.5
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    • pp.530-534
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    • 2015
  • Ultrasonic nanocrystal surface modification (UNSM) is an example of a nanoscale-surface modification that has become noticeable because of its effects on the mechanical improvement of metallic materials. UNSM equipment needs to be both utilized and improved. The equipment is based on an ultrasonic waveguide whose role is to strike surfaces of metallic materials to achieve nanoscale deformation. In this paper, we introduce the development of one kind of UNSM equipment. Using piezoelectric elements, we repeatedly design and fabricate a 20-kHz ultrasonic waveguide. With respect to the composition of the equipment, the waveguide is automatically transferred by two axial stages automatically. In addition, a static force is constantly applied by pneumatic devices. We perform an experiment to verify the feasibility of the equipment.

Design and Basic Performance Test of 4 Inch QC/DC Bellows for LNG Bunkering (LNG 벙커링용 4인치 QC/DC의 설계 및 기초 성능 실험)

  • Jang, Sung-Cheol;Seo, Chang-Myung;Kwen, Min-Soo;Eom, Jeong-Pil;Jung, Hyun-Cheol
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.2
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    • pp.81-86
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    • 2019
  • Although the localization rate of shipbuilding and marine equipment goods is set to be 70 percent by 2020, but the localization rate of equipment and materials for shipbuilding and marine facilities is currently 10 to 30 percent. For Korea's Big 3 shipbuilders, which build 70 percent of the world's largest shipbuilders, localization of shipbuilding equipment and equipment is an essential factor. In particular, there is a growing need to localize equipment and materials in terms of the number of lead standards and A/S. It is expected that there will be a rapid expansion of LNG carriers in the future, and it is necessary to develop equipment and equipment materials of LNG ships. In this study, the design and manufacture of LNG vessel equipment was conducted. Design and basic performance tests of 4-inch QCDC for LNG bunkering were conducted.

A Study on the Reliability Assesment of Solar Photovoltaic and Thermal Collector System (태양광열 시스템의 신뢰성 평가에 관한 연구)

  • Park, Tae-Kook;Bae, Seung-Hoon;Kim, Sang-Kyo;Kim, Seon-Min;Kim, Dae-Hwan;Eom, Hak-Yong;Lee, Keun-Hui
    • New & Renewable Energy
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    • v.16 no.4
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    • pp.49-64
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    • 2020
  • Photovoltaic and Thermal collector (PV/T) systems are renewable energy devices that can produce electricity and heat energy simultaneously using solar panels and heat exchangers. Since PV/T systems are exposed to the outdoors, their reliability is affected by various environmental factors. This paper presents a reliability test for a PV/T system and evaluates the test results. The reliability assessment entails performance, environment, safety, and life tests. The factor that had the greatest influence on the life of the system was the hydraulic pressure applied to the heat exchanger. A test was conducted by repeatedly applying pressure to the PV/T system, and a reliability analysis was conducted based on the test results. As a result, the shape parameter (β) value of 5.6658 and the B10life 308,577 cycles at the lower 95% confidence interval were obtained.

Comparative Study for the Standardization of Grinding Equipment During Dry Grinding Process by Various Grinding Mills (다양한 매체형 분쇄기를 이용한 건식 분쇄공정에서 장비의 표준화를 위한 분쇄실험의 비교 연구)

  • Bor, Amgalan;Sakuragi, Shiori;Lee, Jehyun;Choi, Heekyu
    • Korean Journal of Materials Research
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    • v.25 no.6
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    • pp.305-316
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    • 2015
  • The study of grinding behavior characteristics on the metal powders has recently gained scientific interest due to their useful applications to enhance advanced nano materials and components. This could significantly improve the property of new mechatronics integrated materials and components. So, a new evaluation method for standardizing grinding equipment and a comparative study for the grinding experiment during the grinding process with various grinding mills were investigated. The series of grinding experiments were carried out by a traditional ball mill, stirred ball mill, and planetary ball mill with various experimental conditions. The relationship between the standardization of equipment and experimental results showed very significant conclusions. Furthermore, the comparative study on the grinding experiment, which investigated changes in particle size, particle morphology, and crystal structure of materials with changes in experimental conditions for grinding equipment, found that the value of particle size distribution is related to the various experimental conditions as a revolution speed of grinding mill and media size.