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RISS 인기검색어
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- 저자 : Robert D. Smith (검색결과 4 건)
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Light Emission from Silicon Nanocrystals - Size Does Matter !
Robert G. Elliman,Andrew R. Wilkinson,Barry Luther-Davies,Marc G. Spooner,Marek Samoc,Max J. Lederer,Nathanael Smith,Tessica D.M. Weijers 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
A brief overview of two recent Si nanocrystal studies undertaken at the Australian National University is presented: recent work on hydrogen passivation of non-radiative defects and attempts to measure optical gain in waveguide structures. In the rst study, a generalized treatment of hydrogen passivation and desorption is employed to model the in uence of hydrogen on silicon nanocrystal luminescence. Values for reaction-rate parameters are determined from the model and found to be in excellent agreement with values previously determined for paramagnetic Si danglingbond defects (Pb-type centers) found at planar Si/SiO2 interfaces. In the second study, an attempt is made to measure optical gain in silicon nanocrystals by monitoring the intensity of a probe beam propagating in a waveguide structure containing silicon nanocrystals during photo-excitation of the nanocrystals. The probe beam is shown to be attenuated by the excitation demonstrating the dominance of absorptive processes. No gain was observed.
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마이클 스미스(Michael D. Smith),로버트 도머(Robert Dormer),김동영(Dongyoung Kim) 미래영어영문학회 2016 영어영문학 Vol.21 No.1
이 논문은 제1언어 습득과 제2언어 학습에 관한 주요 연구들을 고찰한다. 특히 제1언어 습득(FLA)과 제2언어 학습(SLA)의 유사점과 차이점을 중심으로 주요 연구들을 살펴보았으며, 이를 통해 FLA와 SLA에서 공통되는 과정들의 존재 여부와 이들의 의의를 살펴보았다. 이를 위해 주요 문헌들을 심리적 측면, 인지적인 측면, 결정적 시기 가설(Critical Period Hypothesis) 측면, 보편문법(Universal Grammar) 측면에서 분석하였다. 결론적으로 FLA와 SLA은 공통점보다 차이점이 많다는 것을 알 수 있다. 그러나 원어민 수준의 제1언어와 2언어를 습득/학습하기에는 제한이 있다는 점과 FLA와 SLA에서 보편문법의 영향을 받을 수 있다는 점에서 FLA와 SLA는 연관되어 있는 과정이라 할 수 있다.
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Bill Roschek Jr.,Ryan C. Fink,Dan Li,Matthew McMichael,Christine M. Tower,Robert D. Smith,Randall S. Alberte 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.3
Rice bran, the outer bran and germ of the kernel and a by-product of rice milling, is rich in phytonutrients but has been underutilized because of lipid content instability. New methods for the processing of rice bran have yielded a stabilized form that is increasingly used in foods and dietary supplements. Recent studies have documented a role for stabilized rice bran (SRB) in treating diabetes and arthritis, although little is known of the bioactive compounds that impart these health benefits. Here we characterize the chemical composition of three extracts of SRB and identify the functional bioactives contributing to the inhibitory properties against three key pro-inflammatory enzymes (cyclooxygenase [COX] 1, COX2, and 5-lipoxygenase [5-LOX]) that control the inflammatory cascade involved in impaired joint health, pain, and arthritis. One extract (SRB-AI) demonstrated significant COX1 and COX2 inhibitory activities with 50% inhibitory concentration (IC50) values for COX1 and COX2 of 305 and 29μg/mL, respectively, but no 5-LOX inhibition. The second extract (SRB-AII) inhibited COX1, COX2, and 5-LOX with IC50 values of 310, 19, and 396μg/mL, respectively. The third extract (SRB-AIII), a blend of SRB-AI and SRB-AIII, inhibited COX1, COX2, and 5-LOX with respective IC50 values of 48, 11, and 197μg/mL. Analysis of the extracts by direct analysis in real time time of flight-mass spectrometry revealed that SRB-AI, SRB-AII, and SRB-AIII contain over 620, 770, and 810 compounds, respectively. Of these, 17 were identified as key bioactives for COX and/or LOX inhibition. These SRB extracts have applications for functional foods and dietary supplements for control of inflammation and joint health.
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Roschek, Bill Jr.,Fink, Ryan C.,McMichael, Dan Li, Matthew,Tower, Christine M.,Smith, Robert D.,Alberte, Randall S. The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.3
Rice bran, the outer bran and germ of the kernel and a by-product of rice milling, is rich in phytonutrients but has been underutilized because of lipid content instability. New methods for the processing of rice bran have yielded a stabilized form that is increasingly used in foods and dietary supplements. Recent studies have documented a role for stabilized rice bran (SRB) in treating diabetes and arthritis, although little is known of the bioactive compounds that impart these health benefits. Here we characterize the chemical composition of three extracts of SRB and identify the functional bioactives contributing to the inhibitory properties against three key pro-inflammatory enzymes (cyclooxygenase [COX] 1, COX2, and 5-lipoxygenase [5-LOX]) that control the inflammatory cascade involved in impaired joint health, pain, and arthritis. One extract (SRB-AI) demonstrated significant COX1 and COX2 inhibitory activities with 50% inhibitory concentration ($IC_{50}$) values for COX1 and COX2 of 305 and $29\;{\mu}g/mL$, respectively, but no 5-LOX inhibition. The second extract (SRB-AII) inhibited COX1, COX2, and 5-LOX with $IC_{50}$ values of 310, 19, and $396\;{\mu}g/mL$, respectively. The third extract (SRB-AIII), a blend of SRB-AI and SRB-AIII, inhibited COX1, COX2, and 5-LOX with respective $IC_{50}$ values of 48, 11, and $197\;{\mu}g/mL$. Analysis of the extracts by direct analysis in real time time of flight-mass spectrometry revealed that SRB-AI, SRB-AII, and SRB-AIII contain over 620, 770, and 810 compounds, respectively. Of these, 17 were identified as key bioactives for COX and/or LOX inhibition. These SRB extracts have applications for functional foods and dietary supplements for control of inflammation and joint health.
KCI
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