• Title/Summary/Keyword: 수전해

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Effects of Trinexapac-ethyl(CGA 163935) on Growth and Lodging of Rice(Oryza sativa L.) (Trinexapac-ethyl(CGA 163935)의 처리(處理)가 수도(水稻)의 생육(生育) 및 도복(倒伏)에 미치는 영향(影響))

  • Im, I.B.;Choi, W.Y.;Lee, S.Y.;Park, K.Y.;Lee, J.L.
    • Korean Journal of Weed Science
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    • v.13 no.1
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    • pp.19-25
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    • 1993
  • This study was conducted to evaluate effect of trinexapac-ethyl{4-(cyclopropyl-${\alpha}$-hydroxy-methylene)-3, 5-dioxocyclohexan carboxylic acid ethyl-ester} for lodging prevention, growth pattern of several organs and yield in machine transplanted rice with 10-day-old seedling. Elongation rate of the second internode affected the most largely by trinexapac-ethyl was 33-52, 35-56 and 42-53% of check in application of 12, 7 and 5days before heading, respectively and, culm elongation was reduced 27-34, 20-29 and 20-25% in application of the same time. Lodging in field was decreased by treatment of trinexapac-ethyl compared with check, Ripened grain ratio and yield were increased about 3-7 and 7-17% by trinexapac-ethyl, respectively.

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Degradation Evaluation of PEM Water Electrolysis by Method of Degradation Analysis Used in PEMFC (고분자전해질 연료전지 열화 분석방법에 의한 PEM 수전해 열화 평가)

  • Oh, Sohyeong;Yang, Jinwon;Chu, Cheun-Ho;Na, Il-Chai;Park, Kwonpil
    • Korean Chemical Engineering Research
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    • v.59 no.1
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    • pp.1-5
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    • 2021
  • The PEM(Proton Exchange Membrane)water electrolysis uses the same PEM electrolyte membrane as the PEM fuel cell and proceeds by the same reaction but the opposite direction. The PEM fuel cell has many methods of degradation analysis since many studies have been conducted on the degradation and durability of the membrane and catalyst. We examined whether PEM fuel cell durability evaluation method can be applied to PEM electrolytic durability evaluation. During the PEM electrolytic degradation process, LSV(Linear sweep voltammetry), CV(Cyclic voltammetry), Impedance, SEM(Scanning Electron Microscope) and FT-IR(Fourier Transform Infrared spectroscopy) were analyzed and compared under the same conditions as the PEM fuel cell. As the PEM fuel cell, hydrogen passing through the membrane was oxidized at the Pt/C electrode, and the hydrogen permeation current density was measured to analyze the degree of degradation of the PEM membrane. Electrode degradation could be analyzed by measuring the electrode active area (ECSA) by CV under hydrogen/nitrogen flowing conditions. While supplying hydrogen and air to the Pt/C electrode and the IrO2 electrode, the impedance of each electrode was measured to evaluate the durability of the electrode and membrane.

Construction Of Uninterruptible Power System by Reliable Incoming Power Method (신뢰도 높은 수전방식에 의한 무(無)정전 전원설비 구축방안)

  • Choi, Jin-Sung;Lee, Sang-Joong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.367-371
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    • 2007
  • Large capacity UPS and emergency generators are being installed and operated at the specific target of important electric facilities that need uninterruptible power supply by the method of countermeasure against power failure for the less reliable incoming power method. Recently, CTTS (Closed Transition Transfer Switch) is being used as uninterruptible power transfer switch at the Common sources of electricity, generator and multiple generators. In this paper, construction plans for uninterruptible power supply system has been suggested in which CTTS has been applied to the secondary of incoming power generator for reliable common dual system method. By briefing the construction of incoming power facilities, large capacity UPS, emergency generator installation space and investment saving effects can be achieved.

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Techno-economic Analysis(TEA) on Hybrid Process for Hydrogen Production Combined with Biomass Gasification Using Oxygen Released from the Water Electrolysis Based on Renewable Energy (재생에너지기반 수전해 생산 수소와 바이오매스 가스화 하이브리드 공정의 기술 경제성 분석)

  • Park, Sungho;Ryu, JuYeol;Sohn, Geun
    • Journal of the Korean Institute of Gas
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    • v.24 no.5
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    • pp.65-73
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    • 2020
  • To reduce the hydrogen production cost through the utilizing the oxygen and improving the capacity factor of water electrolysis used to energy storage of renewable energy, the hybrid hydrogen production process which has dual operating concept of using the water electrolysis as energy storage and oxygen production process for biomass gasification was proposed. Moreover, Techno-economic analysis on this system was quantitatively performed.

A Study on the Hipped-and-Gable-Roof Framework of Muryangsujeon of Buseoksa Temple (부석사 무량수전 측면 지붕부 결구의 구성방식에 관한 재고(再考) - 중국 원대(元代) 이전 목조건축과의 비교를 중심으로 -)

  • Cha, Ju-hwan
    • MUNHWAJAE Korean Journal of Cultural Heritage Studies
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    • v.49 no.3
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    • pp.78-103
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    • 2016
  • This research is a study on the side framework structure of the hipped and gable roof of Muryangsujeon at Buseoksa Temple. There is a record that Muryangsujeon was deconstructed and repaired in the period of Japanese Occupancy, and its authenticity has continuously been called into question because the structure of the hipped and gable side roofs, and the bonding of the rafters and eaves were not in good order and very different from those of Joseon Dynasty. Scholars date it differently. It is either dated at 13th century or 12th century. This study compares the non-planar configuration of the middle and front proportions of Muryangsujeon's hipped-and-gable-roof framework with those of the Tang(唐) and Song(宋) Dynasties in China. It concludes that the hipped-and-gable-roof framework of those architecture were built with the same technique. The style of architecture that side rafters directly touch the internal security (梁), like in Muryangsujeon, is not usual even among the hipped and garble roofs of the Tang(唐) and Song(宋) Dynasties. The technique of constructing the hipped roofs developed much further after the Tang Dynasty because they began to use garble eaves to build the side structure. The technique seems to have developed greatly by the period of Ming and Qing Dynasties. It also seems that the parallel-flat (平行輻射椽) rafter, which is the form of rafters used between the parallelrafter period and the half-flat-rafter period is very similar to the construction style of the current rafters of Muryangsujeon. However, the Muryangsujeon's eaves do not touch the corner rafter from the middle part. This seems to be a unique style, which is not common in China. In conclusion, the style of the side roof framework of Muryangsujeon at Buseoksa Temple is not of the China's southern regions, but of the northern regions of Tang(唐), Song(宋) and Liao(遼) Dynasties. And when considering the construction year and proportions of the middle front and side front on the same flat, this must be an ancient technique of the northeastern regions of Asia. Since it is likely that the structure of the side roof framework of Muryangsujeon at Buseoksa Temple has not been altered but is a unique style of hipped and gable roofs, this roof can serve as a good guide to restoring the hipped and garble roofs of the pre-Goyreo Dynasty period.

Design of the Detachable Electric Power Driving System for Wheel-chair (탈부착형 수전동 휠체어의 제어기 설계)

  • Kwak, YunChang;Bae, Jongnam;Jo, Yeongjun;Ahn, Jin-Woo;Lee, Dong-Hee
    • Proceedings of the KIPE Conference
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    • pp.189-190
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    • 2016
  • 본 논문은 휠체어의 탑승자의 구동력과 BLDCM(Brushless DC Motor) 에서 출력되는 보조력인 전기적인 구동력을 동시에 사용하는 탈부착형 수전동 휠체어의 제어기를 제안한다. 제안된 방식에서는 탈부착형 수전동 휠체어 제어기는 휠체어의 기울기와 휠체어의 상관관계를 바탕으로, 탑승자의 휠체어 림 구동 상태를 추정하여 휠체어의 전동력을 전달하는 BLDCM에서 구동력을 사용자의 지령에 따라 보조하도록 제어한다. 사용자의 요구 상태는 림의 구동에 따른 휠체어의 상태를 가속도, 자이로 센서를 이용해 측정을 하게 되고, 이를 상보필터를 사용해 각도를 보정하여, 지령치를 계산하고, 구동부는 지령치에 따라 휠체어에 필요한 전동력을 발생하게 된다. 탈부착형 수전동 휠체어의 제어방식은 시뮬레이션을 통해 가능성을 검증하였다.

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Performance Degradation of Mea with Cation Contamination in Polymer Electrolyte Membrane Water Electrolysis (고분자 전해질막 수전해 막전극접합체의 양이온 오염에 따른 성능 저하)

  • JUNG, HYEYOUNG;CHOI, NAKHEON;IM, SUHYUN;YOON, DAEJIN;MOON, SANGBONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.4
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    • pp.331-337
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    • 2017
  • Proton Exchange Membrane Water Electrolysis (PEMWE) is one of the most popular and widely used methods for hydrogen production. PEMWE contributes to eco-friendly system via its energy storage system application, hence making it environmentally friendly to use. However, its main drawback is contamination of proton exchange membrane during water electrolysis. Existing cation such as magnesium, calcium and the likes are the cause for membrane contamination. As a result, the cation contamination give rise to degradation of performance of electrolysis and the reverse electrolysis is effective method to remove cation.

Technology Trend for Water Electrolysis Hydrogen Production by the Patent Analysis (특허분석에 의한 수전해 수소제조 기술동향)

  • Hwang, Gab-Jin;Kang, Kyung-Seok;Han, Hye-Jung;Kim, Jong-Wook
    • Transactions of the Korean hydrogen and new energy society
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    • v.18 no.1
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    • pp.95-108
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    • 2007
  • There are several methods for the hydrogen production such as steam reforming of natural gas, photocatalytic method, biological method, electrolysis and thermochemical method, etc. These days it has been widely studying for the hydrogen production method having low hydrogen production cost and high efficiency. In this paper, patents in the hydrogen production by water electrolysis were gathered and analyzed. The search range was limited in the open patents of USA(US), European Union(EP), Japan(JP), and Korea(KR) from 1996 to 2005. Patents were gathered by using key-words searching and filtered by filtering criteria. The trends of the patents was analyzed by the years, countries, companies, and technologies.

A Study on Solution and a Drop of Power Factor according to a Change of Power Network (전력계통변경에 따른 수력발전소 수전역률저하와 그 대책에 관한 연구)

  • Yoon, Jong-Beom;Choi, Jang-Geon;Oh, Bong-Rok;Ok, Kwang-Seok;Park, Kyung-Hwan
    • Proceedings of the KIEE Conference
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    • pp.287-289
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    • 2003
  • 합천수력발전소는 1989년 준공이후 최근까지는 발전정지시 전력계통으로부터 전력을 수전할 경우 수전역률이 90%이상되어 문제가 없었으나, 2001년 6월경 전력계통이 논공154kV변전소에서 고령345kV변전소로 변경된 이후, 계통전압이 평균 $2.5{\sim}3.0kV$상승함으로써 역률이 약70%로 저하하였다. 이런 전압상승은 전력계통의 무효전력조정에 의한 것으로, 수전시 합천수력발전소의 평균소비전력은 주변압기 용량의 약0.55%로 전력계통에서 발전소를 바라보면 주변압기가 무부하로 운전되는 것처럼 보이게 되어 발전소내에서 소비되는 무부하손이 증가하여 역률이 저하한 것으로 검토되었다. 이런 무효전력소비는 주변압기에만 국한되어 있으므로 역률개선용 콘덴서를 주변압기 1차측에 설치하여 저하된 역률을 보상할 수 있었다.

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Electronical Properties On Coupling Capacitor of PLC (전력선 통신의 결합 캐피시터의 전기적 특성)

  • Kim, Byoung-Ho;Lee, Hun-Yong;Kim, Jee-Gyun;Kim, Yu-Kyong;Choi, Yong-Ho;Park, Gwi-Nam
    • Proceedings of the KIEE Conference
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    • pp.1530-1532
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    • 2002
  • 전력선 통신 시스템을 간략히 살펴보면 송전단과 수전단으로 나누어 볼 수 있다. 송전단은 전력을 송전하기 위한 설비와 신호를 싣고 분리하는 결합회로로 구성되며 수전단은 수전설비와 결합회로로 분리된다. 결합회로는 $BaTiO_3$를 주성분으로 하는 고유전율 및 대용량의 캐패시터로 구성되었다. 이 캐패시터를 변압기 외부에 사용하므로, 직사광선에 의한 온도 변화가 생길 것이며 이 변화에 따라 캐패시턴스 값의 변화가 생길 것이므로 HPF로 사용할 때 캐패시턴스 값의 변화로 주파수에 영향을 줄 것이다. 주위온도에 따른 캐패시턴스의 변화가 HPF의 동작에 어떠한 영향을 미치는지 고찰하고자한다. 이에 본 연구에서는 수전단의 10KV이하 배전 선로에 사용되는 Coupling Capacitor의 외부온도를 변화시켜 전기적 특성의 변화를 고찰함으로서, HPF로서의 사용될수 있는지 확인하고자 한다.

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