• Title/Summary/Keyword: HR Plate

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Steel Box Girder Bridge Models of Light Rail Transit with HR Plate (HR Plate의 경량전철 강박스거더교 적용모델)

  • Lee, Seong-Haeng;Yim, Chae-Sun;Hwang, Nak-Yuen;Jung, Kyoung-Sup
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.554-562
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    • 2007
  • To increase the demand of HR Plate with thickness up to 22mm, it is necessary that HR Plate is applicable to full member in steel bridge including main girder. In this study, availabilities of the narrow steel box girder of light railway transit with HR Plate width as a main member are discussed. Computational analysis is performed in 15 bridge models of light railway transit with beam element and plate element. As an analysis results, three models in tight railway transit are presented. In conclusion, it is validated that HR Plate can be applying to narrow steel box girder in the light railway transit.

Application of HR-Plate in Steel Box Girder (HR Plate의 강박스거더 적용 연구)

  • Lee, Seong-Haeng;Hahm, Hyung-Gil;Kim, Kyoung-Nam;Jung, Kyoung-Sup
    • Journal of Korean Association for Spatial Structures
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    • v.7 no.4
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    • pp.63-72
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    • 2007
  • As business of steel consuming industries is freshly booming in domestic and foreign countries especially in China, the price of steel plates comes to very high compare with the other materials. The HR Plates made from hot rolled coils is lower steel plates in price. In this study, material characteristics of HR Plates is investigated and availabilities of HR Plates for steel bridges as sub member or a main member is discussed. No difference between steel plates and HR Plates with thickness up to 22mm is found in most characters such as cutting operation, fabrication and even welding. As sub member in steel box girders, the application ratio and the loss ratio of HR Plate is investigated as about $10{\sim}15%$, average $10{\sim}15%$ respectively.

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Application of Narrow Steel Box Girder Bridge of Light Rail Transit with HR Plate (HR Plate의 경량전철 협폭박스거더교 적용)

  • Park, Dae-Su;Hwang, Nak-Yuen;Jung, Kyoung-Sup;Lee, Seong-Haeng
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.365-375
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    • 2006
  • The HR Plates made hot rolled coils is lower than general structural steel plates in price. No difference between general steel plates and HR Plates with thickness up to 22mm are found in most characters such as cutting operation, fabrication and even welding. It can be concluded that HR Plates with thickness up to 22mm can be applied to flanges and webs of any girders as well as longitudinal ribs, longitudinal and vertical stiffeners of steel bridges appropriately. To increase the demand of HR Plates with thickness up to 22mm, it is necessary that HR Plates is applicable to full member in steel bridge including main girder.In this study, availabilities of the narrow steel box girder of light railway transit with HR Plate width as a main member are discussed. For application of HR Plate to steel bridge with 50m span or more, new support systems in three types are presented. Computational analysis is performed in 15 bridge models of light railway transit with beam element and plate element. As a analysis results, three models in light railway transit are presented. We finally come to the conclusion that HR Plates can be apply to narrow steel box girder in the light railway transit.

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Development of $20\;Nm^3$/hr Hydrogen Generator for Hydrogen Fueling Station (수소스테이션용 $20\;Nm^3$/hr급 수소제조장치 개발)

  • Oh, Young-Sam;Baek, Young-Soon
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.3
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    • pp.263-271
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    • 2006
  • In this study, $20\;Nm^3/hr$ scale compact hydrogen generator which can be apply to the hydrogen station was manufactured and tested. The design of $20\;Nm^3/hr$ scale compact hydrogen generator was upgraded on the base of $5\;Nm^3/hr$ scale plate hydrogen generator concept stacking the plate reactors. Ideas for improving system efficiency such as heat recovery from the exhaust, exhaust duct which is especially design for plate type reactor, reinforcement of insulation, enlargement of heat exchange area of reactor, introduction of desulphurizer reactor and PROX rector in a compact design etc. were applied. From the performance test, we can learn that the $20\;Nm^3/hr$ scale compact hydrogen generator can be operated steadily at 100% road condition and the methane conversion of over 94%(at S/C=3.75) was obtained. This result shows that the concept of plate type hydrogen generator can be scale-up to the $20\;Nm^3/hr$ scale and fit for hydrogen generator for on site hydrogen station application.

Performance test of scale-up $20Nm^3/hr$ scale hydrogen generator for hydrogen station (수소스테이션용 $20Nm^3/hr$급 수소제조장치 스케일-업 및 성능시험)

  • Oh, Young-Sang;Baek, Young-Soon
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.37-42
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    • 2006
  • In this study, $20Nm^3/hr$ scale compact hydrogen generator which can be apply to the hydrogen station was tested for hydrogen station application. $20Nm^3/hr$ scale compact hydrogen generator was developed by upgrading concept of stacking plate reactor from former $20Nm^3/hr$ scale plate hydrogen generator. concepts for improving system efficiency and performance include such as idea of heat recovery from the exhaust, exhaust duct which is especially design for plate type reactor reinforcement of insulation, enlargement of heat exchange area of reactor, introduction of desulphurizer reactor and PROX rector in a compact design, introduction of back fire protection structure of plate burner and so on, We can learn that final prototype of scale-up $20Nm^3/hr$ scale compact hydrogen generator can be operated steadily in 100% road at which over 94% of methane conversion(S/C=3.75) was obtained. In case of making up the weak point, we expect that it is possible to apply to hydrogen station by way of showing an example.

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Evaluation of Mechanical Property for Pb-free Solder/Ni Plate Joints with Artificial Aging Time (인공시효시간에 따른 Ni 기판 Pb-free 솔더접합부의 기계적 물성평가)

  • Park, So Young;Yang, Sung Mo;Yu, Hyo Sun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.5
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    • pp.467-471
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    • 2015
  • Thus far, solders used in electronics remain lead-based. Pb-free solutions in electronic components and systems are receiving increased attention in the semiconductor and electronics industries. Pb-free materials currently in used are Sn-37Pb, Sn-4Ag and Sn-4Ag-0.5Cu/Ni plate joints. In this study, solder alloys were used at high temperatures for artificial aging processing that was performed at $150^{\circ}C$ for 0hr, 100hr, 200hr, 400hr, 600hr and 1000hr. The SP test was conducted at $30^{\circ}C$ and $50^{\circ}C$. As a result, the maximum shear strength of all the specimens decreased with the increase in artificial aging time and temperature of the SP test. In addition, Pb-free solders showed higher total fracture energy compared with Sn-37Pb at high temperatures. The mechanical properties of Sn-4Ag-0.5Cu solder/Ni plate joints remained in excellent conditions in electronic parking systems at high temperatures.

Bacterial Quality of Fish Meat Paste Products and Isolation of Thermoduric Bacteria (어육연제품의 세균학적 품질 및 내열성세균의 특성에 관한 연구)

  • 김동판;장동석;김성준
    • Microbiology and Biotechnology Letters
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    • v.13 no.4
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    • pp.409-415
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    • 1985
  • This study has been carried out in order to investigate the bacterial quality of fish meat paste products and the characteristics of isolated thermodurics from the products. Twenty samples of crab-flavored fish stick (Kematsal), 23 samples of plate fish meat paste (Panomuk, Kamaboko), 5 samples of fried fish meat paste (Tigimomuk), 2 samples of roasted fish meat paste (Puduromuk, Chikuwa), 20 samples of fish sausage were collected from processing plants and supermarkets in Pusan, Korea during the period from May to October in 1984. The results obtained are as follows. Amont the samples collected from supermarkets, roasted fish meat paste and fried fish meat paste marked hish counts in coliforms and fungi while very low in the samples of crab-flavored fish stick and plate fish meat paste. Salmonella was not detected in all the samples examined and Staphylococcus aureus was detected only in fried fish meat paste, Thermoduric bacteria were detected less than 10$^2$/g in the samples of crab-flavored fish stick and plate fish meat paste, which might come from subsidiary materials such as starch and seasonings. Among the isolated bacteria, distribution of the proteolytics were more than 87% and the lipolytics were less than 20%. Gram positive bacteria was more than 70% in crab-flavored fish stick and plate fish meat paste, 47.3% in fried fish meat paste. And rod in shape was almost more than 90% in all the samples. The most heat resistant bacterium isolated from the samples was identified as a Bacillus licheniformis(named B. licheniformis CR-11). The strain showed strong proteolytic activity and also grew well at above 2$0^{\circ}C$. The growth rate and generation time of CR-11 strain were 0.31 hr$^{-1}$ , 2.24 hr at 2$0^{\circ}C$, 0.64 hr$^{-1}$ , 1.09 hr at 3$0^{\circ}C$ and 0.78 hr$^{-1}$ , 0.89 hr at 35$^{\circ}C$. Heat resistance value of the spores of CR-11 strain suspended in phosphate buffer solution was D$_{85}$ $^{\circ}C$=41.9 min, D$_{90}$ $^{\circ}C$=27.9 min, D$_{95}$ $^{\circ}C$=10.2 min, D$_{100}$ $^{\circ}C$=4.3 min (Z=13.8$^{\circ}C$)

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Phase Relations and Microstructure of Comounds in the $Si_3N_4-Al_2O_3-SiO_2$ system at $1700^{\cire}C$ ($Si_3N_4-Al_2O_3-SiO_2$계의 1,$700^{\circ}C$에서 생성하는 화합물의 상관계 및 미구조)

  • Lee, Eey-Jong;Kim, Hwan
    • Journal of the Korean Ceramic Society
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    • v.16 no.4
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    • pp.206-212
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    • 1979
  • The phase relations and microstructure appeared at 1700℃ in a system of Si3N4-Al2O3-SiO2 were studied. The samples were pressurelessly sintered at 1700℃ for 1hr and reheated at 1600℃ for 1hr under nitrogen atmosphere. The compounds formed were identified by X-ray diffraction method and the microstrues were observed by SEM. The stable phases appeared in this system were X-phase, Si2ON2, β'-Si3N4 and Mullite. From the results of those experiments, it was concluded that the X-phase has very close composition to that proposed by G, K. Layden, Si3Al6O12N2. SEM photographs showed that Si2ON2 was a plate phase and X-phase was a rectagular plate phase.

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Phosphorus Removal from Sewage with the Corrosion of Aluminum and Silver to Pilot-Plant

  • Park, S-I;Park, H-I;Jung, O-J;Shin, D-Y;Cheong, K-H
    • Proceedings of the Korean Environmental Health Society Conference
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    • 2003.06a
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    • pp.98-101
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    • 2003
  • The pilot scale experiment was performed to investigate phosphorus and nitrogen removal from sewage by intermittently activated sludge process combined with the electrochemical interaction (Localized Corrosion) of aluminum and silver. The average T-N removal rate for HRT of 24hr was 57.4%. It was possible to remove P in sewage to under 1 mg/L with a short HRT of 12 hr using Al and Ag plate but often required additional A1 plate supplement during the operation.

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Experimental Study on R-l34a Condensation Beat Transfer Characteristics in Plate and Shell Heat Exchanger (판각형 열교환기내의 R-134a 응축열전달 특성에 관한 실험적 연구)

  • 이기백;박재홍;서무교;이희웅;김영수
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.1
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    • pp.108-116
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    • 2003
  • In this paper, the experimental results of condensation heat transfer were reported for the plate and shell heat exchangers(P&SHE) using R-l34a. An experimental refrigerant loop has been established to measure the condensation heat transfer coefficient of R-l34a in a vertical P&SHE. Two vertical counter flow channels were formed in the P&SHE by three plates of geometry with a corrugated trapezoid shape of a chevron angle of 45$^{\circ}$. Downflow of the condensing R-l34a in one channel releases heat to the cold up flow of water in the other channel. The effect of the refrigerant mass flux, average heat flux, system pressure and vapor quality of R-l34a on the measured data were explored in detail. The results indicate that at a higher vapor quality the condensation heat transfer coefficients are significantly higher. Condensation heat transfer coefficients were increased when the refrigerant mass flux was increased. A rise in the average heat flux causes an slight increase in the hr. Finally, at a higher system pressure the hr is found to be lower. Correlation is also provided for the measured heat transfer coefficients in terms of the Nusselt number.