Bioreduction and precipitation of uranium in ionic liquid aqueous solution by Clostridium sp.

Zhang, C.,Dodge, C.J.,Malhotra, S.V.,Francis, A.J. Elsevier Applied Science 2013 Bioresource technology Vol.136 No.-

The ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF<SUB>6</SUB>], N-ethylpyridiniumtrifluoroacetate [EtPy][CF<SUB>3</SUB>COO] and N-ethylpyridiniumtetrafluoroborate [EtPy][BF<SUB>4</SUB>], affected the reduction and precipitation of uranium by Clostridium sp. to a varying degree. Characterization of uranium association with the ionic liquids showed that uranium formed a monodentate complex with the anion BF<SUB>4</SUB><SUP>-</SUP> and PF<SUB>6</SUB><SUP>-</SUP> of [EtPy][BF<SUB>4</SUB>] and [BMIM][PF<SUB>6</SUB>], respectively; and a bidentate complex with carboxylate of [EtPy][CF<SUB>3</SUB>COO]. Bioreduction of U(VI) was influenced by the type of complex formed: monodentate complexes were readily reduced whereas the bidentate complex of U(VI) with [CF<SUB>3</SUB>COO] was recalcitrant. [EtPy][BF<SUB>4</SUB>] affected the rate and extent of precipitation of the reduced uranium; at higher concentration the reduced U(IV) remained in the solution phase. The results suggest that by tuning the properties of ionic liquids they may be valuable candidates for uranium biotreatment.

Association of Chlamydia pneumoniae (Strain TWAR) Infection With Wheezing, Asthmatic Bronchitis, and Adult-Onset Asthma

Hahn, David L.,Dodge, Ruth W.,Golubjatnikov, Rjurik MediMedia Korea 1991 JAMA-Korea Vol.6 No.10

두부 손상 보호를 위한 승객용 헬멧 개발 연구

임정구,권기선,Robin E. Dodge 한국항공운항학회 2010 한국항공운항학회지 Vol.18 No.1

Introduction : Head trauma is the main cause of death in aircraft crash. In a Michigan study of structurally survivable, fatal accidents, 80% of the fatally injured had received head trauma. We tried to develop a new helmet for passengers, and perform its efficiency test. Methods : An aircraft helmet requires an excellent protection against head trauma,lightness, and small volumes. In addition, it must be wearable, fire resistant, and non toxic when it is burning. We developed two new helmets made from silicone foam which met all theses requirements. One was thin (2.5cm), and the other was thick (6.3cm). These looked like a motorcycle helmet and had only a soft silicone as liner material without an outer hard shell. Therefore we can carry them easily inside aircrafts. The standard test for helmet is Snell’s drop test. It measures the impact acceleration of head shaped metal wearing helmet during we drop it at certain heights. Impact sites were total 5 sites (front,back, right, left and top) for each helmet. All these sites were impacted twice. Results : The thickness of impact sites varied from 2.5cm to 6.3cm. The impact acceleration of 2.5cm thickness site when it was dropped from 1.0 meter was 379g. But, that of 6.3cm thickness site when it was dropped from 1.5 meter was only 163g. Unfortunately,both helmets didn't meet the Snell Standard for motorcycle helmets. Discussion : If we add suitable outer hard shell, and change its thickness and design, the efficiency will be increased. A study indicated that helmet could reduce the risk of head trauma up to 85%. We made helmet for passengers in aircraft crash for the first time. If we improve its weak points, it will decrease the frequency of head trauma in aircraft craft.

Interfacial shear strength of reduced graphene oxide polymer composites

Jang, H.K.,Kim, H.I.,Dodge, T.,Sun, P.,Zhu, H.,Nam, J.D.,Suhr, J. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.77 No.-

Interfacial shear strength (IFSS) between particle and matrix in particulate polymer composites is a critical property in determining the mechanical behaviors since it is directly related to not only their Young's modulus or specific strength, but also energy absorbing capability. However, the conventional techniques often present a technical challenge to accurately measure the IFSS between fillers and matrix in the composites. This is more apparent in graphene particulate composites due to their nano-scale dimensions as well as the platelet-shaped geometry. Here, the focus of this study is to use a semi-empirical approach to determine the IFSS of graphene particulate composites by combining experiments with finite element (FE) modeling. The materials of interest are reduced graphene oxide (RGO) and polycarbonate (PC). The tensile testing was performed to characterize the mechanical properties, while simultaneously monitoring the acoustic emission events in order to measure the global debonding stress (GDS) in the composites. By coupling thermal stress analysis and deformation analysis with the GDS as input to a FE model, the IFSS of the RGO particulate PC composites was successfully estimated by about 136MPa, avoiding unnecessary assumptions and uncertainties which are seem to be inevitable with the conventional techniques for the IFSS measurement.

기타 - 외국의 최신문헌 초록 : 위부분절제술 후의 공장생검

I. McL. Baird,O. G. Dodge 대한내과학회 1962 대한내과학회지 Vol.5 No.2

Moments of the spin structure functions g1p and g1d for 0.05<^Q2<3.0^GeV2

Prok, Y.,Bosted, P.,Burkert, V.D.,Deur, A.,Dharmawardane, K.V.,Dodge, G.E.,Griffioen, K.A.,Kuhn, S.E.,Minehart, R.,Adams, G.,Amaryan, M.J.,Anghinolfi, M.,Asryan, G.,Audit, G.,Avakian, H.,Bagdasaryan, Elsevier 2009 Physics letters: B Vol.672 No.1

<P><B>Abstract</B></P><P>The spin structure functions <SUB>g1</SUB> for the proton and the deuteron have been measured over a wide kinematic range in <I>x</I> and <SUP>Q2</SUP> using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH<SUB>3</SUB> and ND<SUB>3</SUB> targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05<<SUP>Q2</SUP><5<SUP> GeV2</SUP> and W<3 GeV. The first moments of <SUB>g1</SUB> for the proton and deuteron are presented – both have a negative slope at low <SUP>Q2</SUP>, as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ0p is also reported. This quantity shows strong <SUP>Q2</SUP> dependence at low <SUP>Q2</SUP>. Our analysis of the <SUP>Q2</SUP> evolution of the first moment of <SUB>g1</SUB> shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ0p data and Chiral Perturbation calculations for γ0p, even at the lowest <SUP>Q2</SUP>.</P>

Target and beam-target spin asymmetries in exclusive ^π+ and ^π− electroproduction with 1.6- to 5.7-GeV electrons

Bosted, P. E.,Biselli, A. S.,Careccia, S.,Dodge, G.,Fersch, R.,Guler, N.,Kuhn, S. E.,Pierce, J.,Prok, Y.,Zheng, X.,Adhikari, K. P.,Adikaram, D.,Akbar, Z.,Amaryan, M. J.,Anefalos Pereira, S.,Asryan, G. American Physical Society 2016 Physical Review C Vol.94 No.5

<P>Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive pi(+) and quasiexclusive pi(-) electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for pi(+)) and deuterons (for pi(-)) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1 < W < 2.6 GeV and 0.05 < Q(2) < 5 GeV2, with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40 000 kinematic bins for pi(+) from free protons and 15 000 bins for pi(-) production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for W < 1.7 GeV and Q(2) < 0.5 GeV2, with discrepancies increasing at higher values of Q(2), especially for W > 1.5 GeV. Very large target-spin asymmetries are observed for W > 1.6 GeV. When combined with cross-section measurements, the present results can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q(2), for resonances with masses as high as 2.3 GeV.</P>

두부 손상 보호를 위한 승객용 헬멧 개발 연구

임정구 ( Jeong Ku Lim ),권기선 ( Ghi Sun Kweon ),( Robin E. Dodge ) 한국항공운항학회 2010 한국항공운항학회지 Vol.18 No.1

Introduction : Head trauma is the main cause of death in aircraft crash. In a Michigan study of structurally survivable, fatal accidents, 80% of the fatally injured had received head trauma. We tried to develop a new helmet for passengers, and perform its efficiency test. Methods : An aircraft helmet requires an excellent protection against head trauma, lightness, and small volumes. In addition, it must be wearable, fire resistant, and non toxic when it is burning. We developed two new helmets made from silicone foam which met all theses requirements. One was thin (2.5cm), and the other was thick (6.3cm). These looked like a motorcycle helmet and had only a soft silicone as liner material without an outer hard shell. Therefore we can carry them easily inside aircrafts. The standard test for helmet is Snell`s drop test. It measures the impact acceleration of head shaped metal wearing helmet during we drop it at certain heights. Impact sites were total 5 sites (front, back, right, left and top) for each helmet. All these sites were impacted twice. Results : The thickness of impact sites varied from 2.5cm to 6.3cm. The impact acceleration of 2.5cm thickness site when it was dropped from 1.0 meter was 379g. But, that of 6.3cm thickness site when it was dropped from 1.5 meter was only 163g. Unfortunately, both helmets didn`t meet the Snell Standard for motorcycle helmets. Discussion : If we add suitable outer hard shell, and change its thickness and design, the efficiency will be increased. A study indicated that helmet could reduce the risk of head trauma up to 85%. We made helmet for passengers in aircraft crash for the first time. If we improve its weak points, it will decrease the frequency of head trauma in aircraft craft.