• 생물환경조절학회지
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• 제25권4호
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• pp.262-269
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• 2016

본 연구는 '상주둥시' 감을 3개월동안 -1, 0.5, $3^{\circ}C$에 저장하면서 감 과실의 과실품질 변화와 저장장해 증상에 미치는 영향을 구명하고자 실시하였다. 저장온도에 따른 감 과실의 에틸렌 발생량은 저장온도가 낮을수록 그 발생량이 낮았으나 호흡율은 영향을 받지 않았다. 과실의 경도는 모든 처리구들에서 저장기간이 길어지면서 감소하였고 저장온도가 높을수록 과실 경도의 저하는 더 빠르게 진행되었다. 또한 저장기간이 길어지고 저장온도가 높을 수록 과실의 연화가 급속히 진행되었다. 과실의 감모율도 저장온도가 높을수록 증가하였고, 가용성 고형물 함량도 저장온도가 낮을수록 더 높게 유지되었다. 감 과실의 과정부와 과실측면의 과피색 $L^*$, $a^*$, $b^*$ 값의 변화는 저장온도 $-1^{\circ}C$와 $0.5^{\circ}C$에서는 저장기간에 따른 차이를 거의 보이지 않았으나, $3^{\circ}C$처리구에서는 과피색의 변화가 현저히 적었다. 저장중 발생하는 생리장해증상인 과피흑변, 과실연화 및 부패정도는 온도가 높을수록 그 증상이 심하게 발생하여 과실품질이 현저히 감소하였다.

• 한국문화재보존과학회:학술대회논문집
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• 한국문화재보존과학회 2003년도 제17회 학술대회 발표 논문집
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• pp.22-26
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• 2003

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.829-831
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• 2003

In the present study, the electroless plating method was applied instead of the sputtering as a formation method of metallic bus electrodes. No additional blackening step is needed in this method since this process provides a metallic seed layer with black color by a single step. The parameters which affects color and morphology of the metallic seed layer in the electroless plating solution were investigated

• 한국진공학회:학술대회논문집
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• 한국진공학회 2008년도 제34회 동계학술대회 초록집
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• pp.222-222
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• 2008

• 한국표면공학회지
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• 제36권5호
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• pp.393-397
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• 2003

The effects of the composition and additives on the blackening and deposition rate of electroless Ni-Zn plating have been examined. Hydrazine resulted in lower sheet resistance of the deposit than sodium hypophosphite. Zinc concentration more than 15 wt% and small amount of ammonium sulfate in the deposits were needed in obtaining Ni-Zn deposit with a black color. An optimum condition was obtained for the black Ni-Zn deposit at an appreciable deposition rate.

• 전기학회논문지
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• 제58권12호
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• pp.2446-2452
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• 2009

A Ceramic Metal-halide lamp is achieved by adding multiple metals to a basic mercury discharge. Because the vapor pressure of most metals is very much lower than mercury itself, metal-halide salts of the desired metals, having higher vapor pressures, are used to introduce the material into the basic discharge. The metal compounds are usually polyatomic iodides, which vaporize and subsequently dissociate as they diffuse into the bulk plasma. Metals with multiple visible transitions are necessary to achieve high photometric efficiency and good color. Compounds of Sc, Dy, Ho, Tm, Ce, Pr, Yb and Nd are commonly used. The maximum visible efficacy of a Ceramic Metal Halide lamp, under the constant of a white light source, is predicted to be about 450lm/W. This is controlled principally by the chemical fill chosen for a particular lamp. Current these lamps achieve 130lm/W and these life time are the maximum 16,000[hr]. So factors of performance lower are necessary to improve lamp performance. In this paper, we analyzed factors of performance lower by accelerated deterioration test. The lamp was operated with short duration turn-on/turn-off procedure to enhance the effect due to electrode sputtering during lamp ignition. The tested lamp that was operated with a longer turn-on/off(20/20 minutes) showed blackening, changed distance between electrodes and lowered color rendering & color temperature by losses of Dy at 421.18nm, I at 511nm, T1 at 535nm and Na at 588nm compared with the new lamp.

• 원예과학기술지
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• 제32권3호
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• pp.359-365
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• 2014

본 연구는 신고 배 저온 저장 중 발생하는 과피 흑변에 관여하는 주요 대사체를 untargeted GC-MS 그리고 targeted HPLC로 알아보고자 하였다. GC-MS 분석 결과 아미노산, 유기산, 당 관련 총 40개의 대사체를 정성할 수 있었고 건전과는 과피흑변과에 비해서 전반적으로 높은 대사체 함량을 보였다. 특히 serine, malic acid, succinic acid가 건전과에서 높게 나타난 반면 과피 흑변과에서는 threonine, fumaric acid, gluconic acid 함량이 높았다. 개개의 phenolic compounds 분석 결과 건전과에서 높은 phenolic compounds 함량을 보였다. 또한 항산화 능력과 깊은 관련이 있는 ascorbic acid가 과피 흑변과에서 낮게 나타났다. 이상의 결과로 보아 세포 내 비정상적인 호흡 및 에너지 대사과정, 항산화 능력 결여가 신고 배 과피 흑변에 관여하는 주요 대사 과정임을 확인할 수 있었다.

• Journal of Veterinary Science
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• 제22권3호
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• pp.31.1-31.12
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• 2021

Background: Blackened intestines in slaughtered pigs have been commonly observed in China in recent years. However, no cause has been reported. Objectives: We attempted to determine whether the blackening of the pig intestine was related to an excess of copper (Cu) in their feed. Methods: In this study, we observed and collected porcine intestines in small- and large-scale pig slaughterhouses in Shandong province from May to October 2018. Twelve types of metal ions were detected in the black intestinal samples. Results: The Cu level in the intestine samples was mostly higher than the Chinese national limit for food. Further study showed that Cu supplementation in most commercial porcine feed also exceeded the national standard. An animal model (mouse) that could mimic the intestinal blackening in pigs was established. Compared to control mice, Cu accumulated in the liver and intestines of mice fed an excessive Cu level, confirming the excessive Cu in the feed may be considered the major cause of blackened porcine intestines. Microscopic examination revealed that black intestines had many particles containing Cu in the lamina propria of the intestinal mucosa, and the intestinal mucosal epithelial cells showed degeneration and necrosis. Conclusions: In conclusion, overuse of Cu in animal feed can lead to animal poisoning and Cu accumulation in animal products. Such overuse not only harms the health of livestock but can also affect public health.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1996년도 추계학술발표회논문집
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• pp.49-52
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• 1996

This paper reports the development of an electronic starter for fluorescent lamps, which is so smartly designed that can be used directly in existing installations. The key point of the design lies in the protection of lamp filaments by sufficient preheating and at the same time in the control of time constant for start-up circuit. The starter is consisted of three system parts: a rectifier pact, a switching part. and a gate control part. The characteristics of the developed electronic starter is compared with those of a conventional glow starter. As a result, blackening of lamps is almost reduced due to the stable and idealized start-up characteristics. And, furthermore, it is shown that its slaving time is shortened at about half the level of the conventional one and the starting power is also reduced.

• 복식
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• 제50권5호
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• pp.159-169
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• 2000

The purpose of this study Is to research the clothing and textiles recorded in Heikemonokatary which was written from 1131 to 1198. The research materials are 36 kinds of men's clothes and ornaments, 6 kinds of women's things, 10 kinds of colorings and 6 kinds of textiles. The results of this study are as follow : 1. There were many advanced warriors' clothes. Especially the helmets and armors were very gorgeous. The shapes of warriors' knives, arrows, shields were concretely described. The women's clothes were mostly unchanged from Nara period and Heian period. Women wore clothes on their heads when they went out. 2. One particular thing in color is that the brown color of that period was navy blue which is symbolic of victory. There were some textiles which was woven with the boiled silk thread in the latitude and the raw silk thread in the longitude. Besides, the blackening of teeth, the bobbed haler of boys, and the celebration of one's corning of age were described in the book.