• Title/Summary/Keyword: Reaction characteristic

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The Comparison of the Bead Size Effect on the Two Wave Patterns Induced in One Reaction System

  • Heo, Do Seong;Kim, Min Seok;Jo, Sang Jun
    • Bulletin of the Korean Chemical Society
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    • v.22 no.8
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    • pp.867-871
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    • 2001
  • We have studied the characteristic wave propagation in 1,4-CHD-Bromate-Ferroin reaction system and we have examined the bead size effect on the wave propagation of the system by adopting a half-divided Petri dish which is separated into two parts by the size of cation-exchange resin. It has been done to understand the reaction process inducing the characteristic wave behavior in the system. The characteristic wave behavior of the system is in the spontaneous induction of a revival wave with a long time lag. We have obtained a result that the revival wave is not affected by the size of catalyst-doped beads while the initially induced wave is influenced by the size of beads. It means that the two waves are induced by different reaction processes each other and the revival wave is induced by an uncatalyzed reaction process.

A study on the Characteristics of Ozone Application Using Photochemical Reaction Lamp (광화학 램프를 이용한 오존응용특성 연구)

  • Woo, Sung-Hun;Lee, Kwang-Sik
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.423-425
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    • 2008
  • In this paper, We have designed and manufactured a photochemical reaction lamp type ozonizer system which was applied to keep quality of herb medicines during storage. We used photochemical reaction lamp in a storage system, and investigated the sterilization characteristic. Also, we made research an ingredient and quality characteristic of herb medicines according to ozone storage.

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A Study on the Thrust Characteristic Analysis of Linear Induction Motor according to Secondary Reaction Plate Using the Container Scanner Vehicle (컨테이너 검색기 이송대차 추진용 선형 유도전동기의 2차측 리액션플레이트 재질에 따른 특성 연구)

  • Jeong, Jae-Hoon;Choi, Jang-Young;Sung, So-Young;Park, Jong-Won;Lim, Jaewon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.1
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    • pp.65-72
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    • 2016
  • This paper presents the analysis of the analysis of thrust characteristics of linear induction motors(LIMs) according to secondary reaction plate. LIMs are well known as high speed transport systems, which can obtain thrust directly without gears and links, or auxiliary mechanisms. A simple structure, easy maintenance, and less environmental pollution are advantages of LIMs. In transport systems using LIMs, the secondary reaction plate is an important design factor, because it has considerable impact on the cost of the railway as well as the performance of the LIMs. This paper deals analyzed the characteristics of linear induction motor used for moving the vehicle of container scanner. Thrust, efficiency and load characteristic were interpreted with FEM regarding two models whose material of secondary reaction plate was copper and aluminum. It suggested the interpretation of thrust, efficiency and power factor characteristic along slip and compared the operation ability of linear induction motor through characteristics analysis along the load.

Effects of Solubility of SO2 Gas on Continuous Bunsen Reaction using HIx Solution (HIx 용액을 이용한 연속식 분젠 반응에 미치는 SO2용해도의 영향)

  • KIM, JONGSEOK;PARK, CHUSIK;KANG, KYOUNGSOO;JEONG, SEONGUK;CHO, WON CHUL;KIM, YOUNG HO;BAE, KI KWANG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.1
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    • pp.13-21
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    • 2016
  • The Sulfur-Iodine thermochemical hydrogen production process (SI process) consists of the Bunsen reaction section, the $H_2SO_4$ decomposition section, and the HI decomposition section. The $HI_x$ solution ($I_2-HI-H_2O$) could be recycled to Bunsen reaction section from the HI decomposition section in the operation of the integrated SI process. The phase separation characteristic of the Bunsen reaction using the $HI_x$ solution was similar to that of $I_2-H_2O-SO_2$ system. On the other hands, the amount of produced $H_2SO_4$ phase was small. To investigate the effects of $SO_2$ solubility on Bunsen reaction, the continuous Bunsen reaction was performed at variation of the amounts of $SO_2$ gas. Also, it was carried out to make sure of the effects of partial pressure of $SO_2$ in the condition of 3bar of $SO_2-O_2$ atmosphere. As the results, the characteristic of Bunsen reaction was improved with increasing the amounts and solubility of $SO_2$ gas. The concentration of Bunsen products was changed by reverse Bunsen reaction and evaporation of HI after 12 h.

The Effect of Reaction Parameters in the Characteristic of PZT Powders Synthesized by SHS (SHS법으로 합성된 PZT분말의 특성에 미치는 반응변수의 영향)

  • Kim, Byeong-Beom;Yang, Beom-Seok;Yun, Ki-Seok;Won, Chang-Whan
    • Journal of the Korean Ceramic Society
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    • v.42 no.5 s.276
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    • pp.314-318
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    • 2005
  • The effect of reaction parameters in the characteristic of $Pb(Zr_{0.52}Ti_{0.48})O_3$ (below nominal PZT) powders by SHS was investigated in this study. In the preparation of PZT, the effect of starting material contents, pressure, additive on phase fraction and morphology was investigated respectively. The optimum condition of PZT powders were prepared by SHS is $0.37Pb_3O_4+0.52ZrO_2+0.48TiO_2+0.35KClO_3+0.5C,\;(P_{Ar}= 50 atm)$. The PZT powder synthesized in this condition had an spherical shape and the particle size of 0.8$\mu$m.

The operation Characteristic of Pilot-scale 2-Stage Coal gasifier (Pilot 규모 2단 형상 가스화기 운전특성 실험)

  • Hong, Jin-Pyo;Chung, Jae-Hwa;Seo, Seok-Bin;Chi, Jun-Hwa;Lee, Seung-Jun;Chung, Suk-Woo
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.528-532
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    • 2009
  • Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed with hydrogen and carbon monoxide, by the gasification process and produces electric power by the gas and steam turbine combined cycle power plant. The purpose of this study is to investigate the influence of gasification process to type and structure of gasifier. For this purpose, the performance characteristics of gasification reaction are analyzed with the operation characteristic of pilot-scale 2-stage coal gasifier. It is found that gasification reaction, floating characteristic of melted slag, particle stick of inside of the gasifier, particle stick and deposit of Syngas cooler are the causes in the different performance characteristics.

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A Comparison with Thermal Reaction Characteristic of Kevlar/EPDM Internal Insulator by Change of Chamber Pressure (Kevlar/EPDM 내열고무의 압력 변화에 따른 열반응 비교)

  • Kang, YoonGoo;Park, JongHo
    • Journal of the Korean Society of Propulsion Engineers
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    • v.20 no.3
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    • pp.71-77
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    • 2016
  • Characteristic of thermal reaction of Kevlar/EPDM internal insulator used in a solid rocket motor chamber was investigated at 1,030 psi, 35.86 s and 1,406 psi, 36.63 s. Surface status after test was similar each other and thermal destruction depth was 4.10 mm and 4.18 mm, respectively. Kinetic constant ${\xi}$, ${\zeta}$ and thermal destruction velocity $V_{TD}$ were also similar. It was concluded that characteristics of thermal reaction of Kevlar/EPDM internal insulator were not affected by change of chamber pressure.

A Study on the Output Characteristic of Vacuum Booster (진공배력장치 출력특성에 대한 연구)

  • Lee, C.T.
    • Journal of Power System Engineering
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    • v.13 no.6
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    • pp.110-116
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    • 2009
  • In the present study, we proposed a simulation model of vacuum booster with AMESIM software to predict the output characteristic. And we performed the sensitivity analysis of output characteristic with main design parameters, such as diaphragm diameter. All of these parameters are main design parameters in the procedure of vacuum booster design. The simulation results of this paper offer qualitative information of vacuum booster output. Therefore, the simulation results of this paper will be used effectively for the design procedure of vacuum booster in the industrial field.

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Generation of Sesame Flavor by the Thermal Reaction Technique

  • Yoo, Seung-Seok
    • Food Science and Biotechnology
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    • v.16 no.1
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    • pp.110-115
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    • 2007
  • In this study we investigated the volatile compounds that are generated in sesame and contribute to its characteristic flavor. Different reaction systems were used to examine how certain amino acids influenced flavor profiles, and also to evaluate the effects of sugar types on the distribution of those volatile compounds. The volatiles that were generated in each reaction system were selectively isolated and analyzed by gas chromatography and gas chromatography-mass spectrometry, respectively. Among the 20 identified compounds, nitrogen-containing alkylpyrazines were found to be the predominant volatiles. The alkylpyrazine amounts varied across the different model systems, with the total yield being highest in the arginine reaction mixture, followed by the alanine, serine, and lysine mixtures. In general, fructose generated the most extensive amount of volatiles compared to glucose and sucrose. However, the yield of specific flavor compounds varied according to the type of sugar used. Finally, the results clearly showed that a reaction temperature of $135^{\circ}C$ and a reaction time of 20 min generated the highest amount of volatile compounds.