• Title/Summary/Keyword: jal

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Measurement of Transpiration Rate of Apple with a Microcomputer-Based Data Acquisition System during CA Storage (마이크로컴퓨터 시스템을 이용한 CA 저장 중 사과의 증산속도 측정)

  • 강준수;서명교
    • Food Science and Preservation
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    • v.1 no.1
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    • pp.37-43
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    • 1994
  • A microcomputer system consisting of 16-bit microcomputer, PCL-711S interface board, censors, and converters have been set up in order to automatically measure temperature, humidity and weight loss which are major variables of storage of apple. This system was operated by PC-LabDAS software. It has been possible to measure continuously the weight loss of Fuji apple stored in CA with the weight converter made by a miniature load cell and a strain amplifier. The temperature was checked by a k-type thermocouple and Pt 100 $\Omega$ RTD, and humidity by PQ653JAl humidity sensor. It has been possible to set up a linear equation which showers high correlationship between the estimate of temperature, weight humidity and the output of the converter in that r2 is more than 0.99. Transpiration rate, a significant factor of quality deterioration for CA storage of apple, can be estimated with these values.

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Comparison of Antioxidant and Physiological Properties of Jerusalem Artichoke Leaves with Different Extraction Processes (추출방법에 따른 돼지감자 잎의 항산화 및 생리활성 비교)

  • Kim, Jae-Won;Kim, Jong-Kyoun;Song, In-Seong;Kwon, Eun-Sung;Youn, Kwang-Sup
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.42 no.1
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    • pp.68-75
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    • 2013
  • The physiological properties of water extracts from Jerusalem artichoke (Helianthus tuberosus L.) leaves (JAL) with different extraction processes (stirrer extraction, SE; reflux extraction, RE; autoclave extraction, AE; low temperature high pressure extraction, LTPE) were investigated. The freeze-dried powder yields of SE, RE, AE, and LTPE were 22.33%, 29.88%, 31.65, and 15.74%, respectively. AE showed the highest value of extract yield. The $a^*$ and $b^*$ values were higher in AE compared to other extracts. Total polyphenolics and flavonoids contents in AE was significantly higher than in other extracts. The amount of proanthocyanidin related substances were highest in LTPE (29.36 mg/g), followed by RE (21.57 mg/g), SE (20.35 mg/g), and AE (13.02 mg/g). The electron donating abilities of SE, RE, AE, and LTPE at a concentration of $500{\mu}g/mL$ (w/v) were 76.16%, 39.55%, 25.50%, and 12.59%, respectively. Reducing power for the four different processes was 1.79, 1.60, 1.51, and 1.17, respectively. Additionally the same tendency was observed with electron donating ability and reducing power for ABTS radical and nitrite scavenging abilities. AE and LTPE showed relatively high antioxidant activities. Alpha-glucosidase, xanthine oxidase, and angiotensin I-converting enzyme inhibitory activities of LTPE at a concentration of $500{\mu}g/mL$ (w/v) were somewhat higher than other extracts. Additionally, there was significantly higher or little lower inhibitory activity compared to the control group. In conclusion, we provided experimental evidence that extracts of JAL have potential as functional materials, and component analysis of JAL could be used as new cosmeceuticals. Also, LTPE is the superior method for the enhancement of biological activity.

Depletion of Solid Solution Elements and Change of Carbides in Artificially Aging Heat Treated 2.25CrMo Steel (인공 경년열화 열처리된 2.25CrMo 강에서의 고용원소 고갈 및 탄화물 변화)

  • Byeon, Jal Won;Pyo, S.W.;Kwun, S.I.
    • Journal of the Korean Society for Heat Treatment
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    • v.15 no.2
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    • pp.70-75
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    • 2002
  • The depletion of solid solution elements from matrix and the change of carbides during artificial aging of 2.25CrMo steel at $630^{\circ}C$ were investigated. The Mo and Cr elements were found to be depleted drastically in the early stage of aging. The change of carbides was confirmed by analyzing the XRD patterns of electrolytically extracted carbides. Four type of carbides, $M_{23}C_6$, $M_3C$, $M_2C$ and $M_6C$, were found to exist in the specimen before aging. The amount of $M_6C$ carbides increased with aging time, while that of $M_3C$ carbides diminished after short aging time.

A Study on the Effects of Multi-Walled Carbon Nanotubes on Electrochemical Performances of Li/S Secondary Batteries (Multi-Walled Carbon Nanotubes가 Li/S 이차전지의 전기화학적 성능에 미치는 영향)

  • Song, Min-Sang;Han, Sang-Cheol;Kim, Hyun-Seok;Kim, Jin-Ho;Kang, Yong-Mook;Ahn, Hyo-Jun;Lee, Jal-Young
    • Transactions of the Korean hydrogen and new energy society
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    • v.14 no.2
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    • pp.122-130
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    • 2003
  • Li/S 이차전지의 유황양극의 전기전도도를 향상시키고 유황이 충방전시 전해질내로 용출되는 것을 방지하기 위하여 multi-walled carbon nanotubes (MWNTs)를 thermal CVD 방법으로 제조하여 유황양극에 첨가하였다. 실험결과 첫 사이클에서 Li/S 이차전지의 방전용량은 485mAh/g-sulfur이었고, MWNT 첨가 이후에 유황양극의 cycle life와 rate-capability가 향상되는 것을 관찰할 수 있었다. 그러므로 MWNT는 polysulfide를 유황양극에 흡착시키는 동시에 good electric conductor로서 작용한다는 것을 알 수 있었다.

The Propagation Characteristics of Electromagnetic Wave Radiated at Gap in Air and Insulator (대기중과 절연체 갭에서 방사되는 방사전자파의 전파특성)

  • 김충년;이현동;박광서;박원주;이광식;이동인
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.1
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    • pp.104-111
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    • 2001
  • In this paper, VHF( 30~230 [MHz] ) elecbwrognetic waves radiated fyom 며$\pi$jal discharge( PD ) at two-type electrodes in air are measured and the peculiar patterns of their spectra are reported. Also, the polarization and distance characteristics of electromagnetic wave radiated by PD, were investigated. In case of the epoxy msulator inserted, the noise level of radiated electromagnetic waves is 0.6~6.2 [dB] higher than the case in air below 90 [MHz] The frequncy spectrun distribution of radiated electromagnetic waves appears to be different in the whole frequency range according to the arrangmnent of antenna.

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Isolation and Characterization of Strain of Bacillus thuringiensis subsp. kenyae Containing Two Novel cry1-Type Toxin Genes

  • Choi, Jae-Young;Li, Ming Shun;Shim, Hee-Jin;Roh, Jong-Yul;Woo, Soo-Song;Jin, Byung-Rae;Boo, Kyung-Saeng;Je, Yeon-Ho
    • Journal of Microbiology and Biotechnology
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    • v.17 no.9
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    • pp.1498-1503
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    • 2007
  • To identify novel crystal proteins, Bacillus thuringiensis 2385-1 was isolated from Korean soil samples and characterized. The H-serotype of 2385-1 was identical to that of subsp. kenyae (H4a4c), and its crystal toxin was bipyramidal-shaped. However, 2385-1 showed a much higher toxicity towards Plutella xylostella and Spodoptera exigua larvae than subsp. kenyae. In addition, the crystal protein profile and plasmid DNA pattern of 2385-1 differed from those of subsp. kenyae. To verify the crystal protein gene types of 2385-1, a PCR-RFLP analysis was performed, and the results revealed that 2385-1 contained two novel cry1-type crystal protein genes, cryl-5 and cry1-12, in addition to the crylJal gene. The deduced amino acid sequences of cryl-5 and cry1-12 showed a 97.9% and 75.7% sequence similarity with the CrylAb and CrylJa crystal proteins, respectively. Among the novel crystal proteins, Cry1-5 showed a high toxicity towards P. xylostella and S. exigua larvae. In conclusion, B. thuringiensis 2385-1 is a new isolate in terms of its gene types, and should be a promising source for an insecticide to control lepidopteran larvae.

The Characterization of New Type of Alkaline Fuel Cell using Hydrogen Storage Alloys (수소저장합금을 이용한 신개념의 알칼라인 연료전지의 특성에 관한 연구)

  • Kim, Jin-Ho;Lee, Ho;Lee, Han-Ho;Lee, Paul S.;Lee, Jal-Young
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.2
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    • pp.135-142
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    • 2002
  • 본 연구는 Chemical hydride 형태의 수소발생제를 포함한 액체연료를 이용한 신개념의 알칼라인 연료전지의 특성을 분석하였다. Chemical hydride는 연료전지의 수소공급원으로써 사용될 수 있으며, 본 연구팀은 KOH 전해질에 수소발생제인 Sodium Borohydride ($NaBH_4$)를 첨가하여 제조된 액체연료를 알칼라인 연료전지에 공급함으서 상온에서 매운 우수한 전기 화학적 성능결과를 얻을 수 있었다. 이때 음극 찰물질로 $ZrCr_{0.8}Ni_{1.2}$ 수소저장합금이 사용되었으며, 양극은 방수처리된 카본지 위에 분산된 Pt/C 가 사용되었고, air가 latm으로 양극에 공급되었다. 음극에 대한 XRD 분석결과 음극에서의 산화에 의해 Sodium Borohydride ($NaBH_4$)가 분해되어 수소가 발생되며, 연속적으로 액체연료가 주입되어도 전지가 작동하는 것을 확인할 수 있었다. 이때 에너지밀도는 6,000 Ah/kg (for $NaBH_4$ or $KBH_4$)이다.

The Chemical Components of Perilla Leaf(frutescens Britton var. acuta Kudo) by the Making Process and Sensory Evaluation of Jasosuksu (제조과정에 따른 자소엽의 화학적 성분 및 자소숙수의 기호적 특성)

  • Kim, Seong-Mi;Jung, Hyun-Sook;Choi, Ok-Jal
    • Korean Journal of Human Ecology
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    • v.8 no.4
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    • pp.23-35
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    • 2005
  • The purpose of this study was to analyze the chemical components of Perilla leaf(frutescens Britton var. scuta Kudo) according to the making process, and to examine Hunter's color value and sensory evaluation of Jasosuksu by extraction time. Perilla leaves were prepared in three types; fresh leaf, dried leaf in the shade and roasted leaf after being dried in the shade in order to make Jasosuksu. The results of the research were as follows: Free sugars(sucrose, glucose, fructose) and organic acids(citric acid, tartaric acid, malic acid, succinic acid) were present in the fresh leaf, dried leaf and roasted leaf. $15{\sim}16$ kinds of amino acid including aspartic acid were determined in the fresh leaf, dried leaf and roasted leaf, and the major free amino acids were serine, aspartic acid, and glutamic acid. The major total amino acids of tile fresh leaf, dried leaf and roasted leaf were glutamic acid, histinine, and glycine. The major fatty acids of Perilla leaves were palmitic acid, linolenic acid, and linolenic acid. The content ratio of linolenic acid in fresh leaves was the highest, but that of palmitic acid was lower than that of dried leaves and roasted leaves. L value, a value, and b value of Perilla leaf were the highest in the roasted leaves followed by the order of dried leaves and fresh leaves. L value and b value of Jasosuksu extracted from roasted leaves were higher than Jasosuksu extracted from dried leaves. The preference of color, flavor, sweetness of Jasosuksu extracted from dried leaves was the highest when extraction time was 10 min. at $70^{\circ}C$, but that of Jasosuksu extracted from roasted leaves was the highest when extraction time was 15 min. at $70^{\circ}C$. The preference of color, flavor, taste of Jasosuksu extracted from roasted leaves was higher than that of Jasosuksu extracted from dried leaves.

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