• 한국결정학회지
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• 제1권2호
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• pp.61-65
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• 1990

수열육성법 (Hydrothermal growth technique)으로 연수정을 육성하고 원료, 용제, 발색제, 종자결정 및 irradiation등의 요소가 육성된 결정에 미치는 영향에 대하여 고찰하였다. UV-visible spectrum분석에 의해 육성된 결정과 천연 연수정의 광학적 특성 을 비교하였다. 본 연구결과로 결함이 적고 연색 (연색)이 선명한 길이 120mm. 폭 35mm, 두께 14m (135g)의 연수정 육성에 성공하였다.

• 천문학회지
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• 제32권1호
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• pp.55-63
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• 1999

NGC 6537 is an extremely high excitation bipolar planetary nebula. It exhibits a huge range of excitation from lines of [N I] to [Si VI]or [Fe VII], i.e. from neutral atoms to atoms requiring an ionization potential of $\~$167eV. Its kinematical structures are of special interest. We are here primarily concerned with its high resolution spectrum as revealed by the Hamilton Echelle Spectrograph at Lick Observatory (resolution $\~0.2{\AA}$) and supplemented by UV and near-UV data. Photoionization model reproduces the observed global spectrum of NGC 6537, the absolute H$\beta$ flux, and the observed visual or blue magnitude fairly well. The nebulosity of NGC 6537 is likely to be the result of photo-ionization by a very hot star of $T_{eff} \~ 180,000 K$, although the global nebular morphology and kinematics suggest an effect by strong stellar winds and resulting shock heating. NGC 6537 can be classified as a Peimbert Type I planetary nebula. It is extremely young and it may have originated from a star of about 5 $M_{\bigodot}$.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1994년도 춘계학술대회 논문집
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• pp.75-78
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• 1994

Organic ultra thin films about 500${\AA}$ in thickness are fabricated by LB(Langmuir-Blodgett) technique and their gas detect properties are investigated. The LB films deposited are made of the specimen named as N-docosyl pyridinium(TCNQ) and the deposition is verified by capacitance conductivity measurement. From the study of gas detect properties with I-V characteristics and UV spectrum we have found that their conductivities were increased about 3 times of magnitude and peaks of UV spectrum were decreased.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.316-316
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• 2010

Six metal-free organic dyes having thiophene (1), benzene-thiophene (2), thiophene-benzene (3), thiophene-pyridine(4), thiophene-thiophene (5), and pyridine (6) linkers between 9,9-dimethylfluorenyl terminal group and $\alpha$-cyanoacrylic acid anchor were synthesized. Among them, organic dye 5 showed the longest ${\lambda}}max$ value (424 nm) in UV-Vis absorption spectrum, better incident monochromatic photon-to-current conversion efficiency (IPCE), highest short circuit photocurrent density (JSC, 9.33 mA2/cm2), and highest overall conversion efficiency ($\eta$, 3.91%).

• 공업화학
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• 제10권6호
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• pp.828-831
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• 1999

Meso-(mesityl)dipyrromethane(MS-DPM)과 4-nitrobenaldehyde로부터 5,15-bis(mesityl)-10,20-bis(4-amino)porphyrin[mesityl-$TPP(NH_2)$]을 합성하였다. Mesityl-$TPP(NH_2)$는 UV spectrophotometer[Soret-band(438 nm), Q-band(526, 572, 611 nm)]와 $^1H$-NMR spectroscopy에 의해 그 구조를 확인하였다. 3,3',4,4'-Benzophenone tetracarboxylic dianhydride(BTDA)와 2,2-bis(4-(4-aminophenoxy)-phenyl)hexafluoropropane(BAPHF)를 mesityl-$TPP(NH_2)$와 축합시켜 porphyrin 구조를 포함하는 copolyimide를 합성하였다. 제조된 copolyimide 역시 UV spectrophotometer [Soret-band (428 nm), Q-band (558 nm, 599 nm)]와 FT-IR spectrophotometer를 이용하여 그 구조를 확인하였고, 열분석 결과 $T_g$와 $T_m$은 각각 220.7와 $369.2^{\circ}C$였다.

• 한국안전학회지
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• 제16권1호
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• pp.1-8
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• 2001

All objects emit thermal radiation and this radiation is the basis of the techniques used to detect flames. The usual phenomena occurring in the initial stage of the fire are generally invisible products of a combustion and visible smoke. Liquid or gaseous materials do not undergo a smoldering stage so that fires develop very rapidly. Also, the heat generated by the initial flames is usually not sufficient to activate a heat detector. In this case the most effective criterion for automatic fire detection is the flame. According to the fire regulation of korea, the compulsory standard provided that a flame detector shall be installed in a place that the attachment height of detector is higher than 20 m, chemical plants, hangar, refinery, etc.. The results of the research and development are discriminated between a flame and other radiant emitters, developed a UV detector tube contains an inert gas which absorbs UV radiation, developed PZT pyroelectric element is based on the use of photovoltanic cell, developed IR band-pass filter that only allow a 4.3 $\mu\textrm{m}$ radiation wavelength to reach the sensors and developed UV-IR combination flame detector combined into a single detection device.

• 한국환경보건학회지
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• 제28권5호
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• pp.59-64
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• 2002

The photocatalytic decolorization of the Rhodamine B (RhB) was studied using a UV/TiO$_2$ reactor. Yakuri titanium dioxide(anatase) was used as the suspended photocatalyst and proved to be effective for decolorization irradiated with UV light (254 mm). The photocatalyzed dioxide concentrations, light intensity and air flow rates. In 0.01 mM RhB, color could be completely photodegraded after 3 hours. Absorption spectrum of an aqueous solution containing RhB showed a continued diminution of the RhB concentration in the solution bulk : concomitantly, no new absorption peaks appeared. This confirmed the decolorization of RhB, i.e., the break up of the chromopore. The optimum loaded titanium dioxide for the decolorization was 0.75 g/(equation omitted). The light intensity showed exponential decay with distance. The decay of light intensity of RhB solution showed different tendency from TiO$_2$. These results suggested that the photocatalytic decolorization of dyes may be available method for decolorizing in wastewater.

• 한국세라믹학회지
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• 제30권10호
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• pp.797-802
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• 1993

Graphite fiber intercalated compound was deintercalated at $25^{\circ}C$, 65% of humidity and its deintercalated compound was discussed, based on the X-ray diffraction analysis, electrical resistivity measurement, and UV/VIS spectrometer measurements. During deintercalation, the structure was changed in orderlongrightarrowdisorderlongrightarroworder, and resistivity was decreased in the disorder state of the structure, which reflectance minimum of the UV/VIS spectrum ranged from 660 to 750nm (1.88~1.65eV).

• 대한본초학회지
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• 제23권1호
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• pp.109-116
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• 2008

Objectives : This study was performed to investigate the discriminative criteria of 6 kinds of Achyranthis Radix by HPLC/DAD. Methods : 20-hydroxyecdysone is isolated by silica gel column chromatography ($CHCl_3$:MeOH, 7:1-1:1 v/v) and identified by nuclear magnetic resonance, A high-performance liquid chromatographic method with diode array detection was used to identify 20-hydroxyecdysone in A. japonica. The analysis was performed using $C_{18}$ column with isocratic elution consisted of 18% acetonitrile and 82% water and the detection was carried out by DAD at 254 nm. 6 kinds of Achyranthis Radix from different locations were extracted in MeOH. Each extracts was analyzed by HPLC in same condition as used in analysis of 20-hydroxyecdysone. The identities of each extracts were determined by comparing the retention time and UV spectrum with that of reference compound. Results : 1. A. japonica and A. bidentata showed the similar patterns of HPLC chromatogram and 20-hydroxycedysone was present in both of them because the peaks having the same retention time and UV spectrum as 20-hydroxyecdysone were shown in the HPLC chromatograms of A. japonica and A. bidentata 2. Cyathula officinalis and C. capitata showed the similar patterns of HPLC chromatogram. The peak having the same retention time and UV spectrum as 20-hydroxyecdysone was shown in the HPLC chromatogram of C. capitata but not shown in the HPLC chromatogram of C. officinalis. 3. Two species of medicinal drugs from Sacheon province showed similar patterns of HPLC chromatogram. Achyranthis Radix from Sacheon(wild) did not have 20-hydroxycedysone but Achyranthis Radix from Sacheon(cultivated) showed the peak having the same retention time as 20-hydroxyecdysone but UV spectrum of the peak was different from that of 20-hydroxyecdysone. Conclusions : These results suggested that 20-hydroxyecdysone could be the discriminative criteria for Achyranthis Radix contain 20-hydroxyecdysone though they belong to different genus and species. And the patterns of HPLC chromatogram also could be the discriminative criteria as the different species of Achyranthis Radix belonging to the same genus showed similar patterns of HPLC chromatogram.

• 한국식품영양과학회지
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• 제31권5호
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• pp.723-727
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• 2002

감마선 조사에 의 한 마늘의 주요 알러젠 단백질인 allivin의 구조적 변화를 관찰하였다. Allivin 용액 (3.0 mg/mL in 0.01 M PBS, UH 7.4)과 생 마늘에 2.5, 5.0, 7.5, 10.0 kGy의 흡수선량을 갖도록 감마선을 조사하였다. 조사 후 용액의 절반을 0.22$\mu\textrm{m}$ filter로 여과하여 준비하였다. 감마선 조사에 의한 allivin의 변화는 UV spectrum과 SDS-PAGE를 사용하여 관찰하였다. 가시적으로 관찰하였을 때, 조사선량이 증가할수록 allivin 용액의 혼탁도가 증가하였으며 ,660 nm 파장에서의 흡광도의 증가로 확인할 수 있었다. 조사 후 여과한 allivin 용액의 UV spectrum 측정에서 혼탁도의 변화가 크게 감소되었으며, 선량이 증가할수록 용해된 단백질의 농도가 소하였다. SDS-PAGE시험에서 감마선 조사된 allivin의 큰 변화는 관찰되지 않았으나, 분자간 응집이 관찰되었다 그러나, 조사 후 여과한 시료에서 는 allivin의 감소가 관찰되었으며, 분자간 응집으로 발생된 끌림도 감소하였다. 생마늘에 대한 전기영동 결과는 차이가 없었다. 이 결과들은 감마선 조사가 수용액 상태에서 allivin의 알러지성을 감소시킬 수 있음을 시사한다.