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- 저자 : Huff, Gregory S. (검색결과 7 건)
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Reish, Matthew E.,Huff, Gregory S.,Lee, Wonho,Uddin, Mohammad Afsar,Barker, Alex J.,Gallaher, Joseph K.,Hodgkiss, Justin M.,Woo, Han Young,Gordon, Keith C. American Chemical Society 2015 Chemistry of materials Vol.27 No.8
<P>The electronic properties of the donor–acceptor (DA) polymer poly{5,6-bis(octyloxy)-4-(thiophen-2-yl)benzo[<I>c</I>]-1,2,5-thiadiazole} (PTBT) have been investigated using spectroscopic and computational techniques. Electronic absorption and emission spectra reveal the presence of an ordered and a disordered phase in solution. Franck–Condon modeling of the ordered phase yields Huang–Rhys factors of 0.55 (20 °C) and 0.51 (−180 °C), indicating little structural distortion between ground and excited state. DFT calculations with resonance Raman spectroscopy are consistent with a lowest energy excited state that is electronically delocalized and has little charge-transfer character, unexpected for a copolymer with a low bandgap (∼1.8 eV). Transient absorption spectroscopy of PTBT:fullerene blends reveals near-unity internal charge-transfer yields in both ordered and disordered film morphologies. In the disordered blend, charge transfer is complete within the laser pulse (100 fs), whereas the ordered blend also features a slower phase due to exciton diffusion in the phase separated morphology. In the ordered blend, the spectra and dynamics of charge transfer reveal that excitons and charges promptly occupy delocalized states on extended polymer chains. The pervasive use of donor–acceptor structures in polymer devices makes understanding the interplay of morphology and electronic structure of these polymers essential and here a spectroscopic and computational investigation gives an extensive picture of the electronic properties and their effect on charge dynamics in a DA polymer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-8/cm504655f/production/images/medium/cm-2014-04655f_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm504655f'>ACS Electronic Supporting Info</A></P>
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Prediction of Mortality in Nonagenarians Following the Surgical Repair of Hip Fractures
Ashraf Fansa,Scott Huff, BA,Nabil Ebraheim 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.2
Background: The purpose of this study is to report on the mortality of nonagenarians who underwent surgical treatment for a hip fracture, specifically in regards to preexisting comorbidities. Furthermore, we assessed the effectiveness of the Deyo score in predicting such mortality. Methods: Thirty-nine patients over the age of 90 who underwent surgical repair of a hip fracture were retrospectively analyzed. Twenty-six patients (66.7%) suffered femoral neck fractures, while the remaining 13 (33.3%) presented with trochanteric type fractures. Patient charts were examined to determine previously diagnosed patient comorbidities as well as living arrangements and mobility before and after surgery. Results: Deyo index scores did not demonstrate statistically significant correlations with postoperative mortality or functional outcomes. The hazard of in-hospital mortality was found to be 91% (p = 0.036) and 86% (p = 0.05) less in patients without a history of congestive heart failure (CHF) and chronic pulmonary disease (CPD), respectively. Additionally, the hazard of 90-day mortality was 88% (p = 0.01) and 81% (p = 0.024) less in patients without a history of dementia and CPD, respectively. The hazard of 1-year mortality was also found to be 75% (p = 0.01) and 80% (p = 0.01) less in patients without a history of dementia and CPD, respectively. Furthermore, dementia patients stayed in-hospital postoperatively an average of 5.3 days (p = 0.013) less than nondementia patients and only 38.5% returned to preoperative living conditions (p = 0.036). Conclusions: Nonagenarians with a history of CHF and CPD have a higher risk of in-hospital mortality following the operative repair of hip fractures. CPD and dementia patients over 90 years old have higher 90-day and 1-year mortality hazards postoperatively. Dementia patients are also discharged more quickly than nondementia patients.
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China in 2005: Implications for the Rest of the World
( Channing Arndt ),( Thomas Hertel ),( Betina Dimaranan ),( Karen Huff ),( Robert Mcdougall ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 1997 Journal of Economic Integration Vol.12 No.4
This paper analyzes the impact of continued rapid growth in china on her trading partners using a multiregion, applied general equilibrium model. Contrary to conventional wisdom, we find that most developing countries benefit from china`s growth. Product differentiation plays a key role in this finding. systematic analysis of these welfare gains shows that, as expected, simple terms of trade calculations based on net trade positions and average world price changes predict a loss for the developing countries. However, with the exceptions of South Asia and Thailand, this loss is overshadowed by a positive movement in region-specific export price indices. Second-best effects also play a significant role in the gains for a number of the developing countries. (JEL Classification: Fl1, F15)
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China in 2005 : Implications for the Rest of the World
Arndt, Channing,Hertel, Thomas,Dimaranan, Betina,Huff, Karen,McDougall, Robert 세종대학교 국제경제연구소 1999 Journal of Economic Integration Vol.12 No.4
This paper analyzes the impact of continued rapid growth in China on her trading partners using a multiregion, applied general equilibrium model. Contrary to conventional wisdom, we find that most developing countries benefit from China's growth. Product differentiation plays a key role in this finding. Systematic analysis of these welfare gains shows that, as expected, simple terms of trade calculations based on net trade positions and average world price changes predict a loss for the developing countries. However, with the exceptions of South Asia and Thailand, this loss is overshadowed by a positive movement in region-specific export price indices. Second-best effects also play a significant role in the gains for a number of the developing countries. (JEL Classification: F11, F15)
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Biochar from woody biomass for removing metal contaminants and carbon sequestration
Tarek M. Abdel-Fattah,Mohamed E. Mahmoud,Somia B. Ahmed,Matthew D. Huff,James W. Lee,Sandeep Kumar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Biochar generated from pinewood via slow pyrolysis was studied for its viability as a soil amendment aswell as for its absorptive capacity for Mg, Ca, Cr, and Pb in solution. Cation exchange capacity (CEC)measurements showed that the biochar sample has a CEC of roughly double that of the reference soilsample. A high CEC value indicates that not only can the biochar sample be used as a carbonsequestration agent, but also as a valuable soil amendment for increasing a soil’s natural CEC. Biocharwas characterized using elemental analysis, SEM, BET surface area, FTIR, and XRF. These results showedthat biochar produced via slow pyrolysis possesses several highly beneficial attributes. The metaladsorption characteristics of biochar were studied in presence of various controlling parameters such aspH, contact time, adsorbent dosage, and interfering species. The results confirmed excellent adsorptioncapacity values of the biochar for Mg(II), Ca(II), Cr(VI), and Pb(II) by producing 440 (pH 7.0), 120 (pH 7.0),680 (pH 1.0), and 520 (pH 6.0) mmol g 1, respectively. The potential applications of the biochar forremoval of these four metal ions from real water samples were also studied and evaluated.
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