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Evans, D. F.,Southworth, J.,Smalley, B.,Jørgensen, U. G.,Dominik, M.,Andersen, M. I.,Bozza, V.,Bramich, D. M.,Burgdorf, M. J.,Ciceri, S.,D’Ago, G.,Figuera Jaimes, R.,Gu, S.-H.,Hinse, T. C.,Henning, Th Springer-Verlag 2018 Astronomy and astrophysics Vol.610 No.-
<P><I>Context.</I> The formation and dynamical history of hot Jupiters is currently debated, with wide stellar binaries having been suggested as a potential formation pathway. Additionally, contaminating light from both binary companions and unassociated stars can significantly bias the results of planet characterisation studies, but can be corrected for if the properties of the contaminating star are known.</P><P><I>Aim.</I> We search for binary companions to known transiting exoplanet host stars, in order to determine the multiplicity properties of hot Jupiter host stars. We also search for and characterise unassociated stars along the line of sight, allowing photometric and spectroscopic observations of the planetary system to be corrected for contaminating light.</P><P><I>Methods.</I> We analyse lucky imaging observations of 97 Southern hemisphere exoplanet host stars, using the Two Colour Instrument on the Danish 1.54 m telescope. For each detected companion star, we determine flux ratios relative to the planet host star in two passbands, and measure the relative position of the companion. The probability of each companion being physically associated was determined using our two-colour photometry.</P><P><I>Results.</I> A catalogue of close companion stars is presented, including flux ratios, position measurements, and estimated companion star temperature. For companions that are potential binary companions, we review archival and catalogue data for further evidence. For WASP-77AB and WASP-85AB, we combine our data with historical measurements to determine the binary orbits, showing them to be moderately eccentric and inclined to the line of sight (and hence planetary orbital axis). Combining our survey with the similar Friends of Hot Jupiters survey, we conclude that known hot Jupiter host stars show a deficit of high mass stellar companions compared to the field star population; however, this may be a result of the biases in detection and target selection by ground-based surveys.</P>
Management of complex surgical wounds of the back: identifying an evidence-based approach
Elizabeth G. Zolper,Meher A. Saleem,Kevin G. Kim,Mark D. Mishu,Sarah R. Sher,Christopher E. Attinger,Kenneth L. Fan,Karen K. Evans 대한성형외과학회 2021 Archives of Plastic Surgery Vol.48 No.6
Background Postoperative dehiscence and surgical site infection after spinal surgery can carry serious morbidity. Multidisciplinary involvement of plastic surgery is essential to minimizing morbidity and achieving definitive closure. However, a standardized approach is lacking. The aim of this study was to identify effective reconstructive interventions for the basis of an evidence-based management protocol. Methods A retrospective review was performed at a single tertiary institution for 45 patients who required 53 reconstruction procedures with plastic surgery for wounds secondary to spinal surgery from 2010 to 2019. Statistical analysis was performed for demographics, comorbidities, and treatment methods. Primary outcomes were postoperative complications, including dehiscence, seroma, and infection. The secondary outcome was time to healing. Results The overall complication rate was 32%, with dehiscence occurring in 17%, seroma in 15% and infection in 11% of cases. Median follow-up was 10 months (interquartile range, 4–23). Use of antibiotic beads did not affect rate of infection occurrence after wound closure (P=0.146). Use of incisional negative pressure wound therapy (iNPWT) was significant for reduced time to healing (P=0.001). Patients treated without iNPWT healed at median of 67.5 days while the patients who received iNPWT healed in 33 days. Demographics and comorbidities between these two groups were similar. Conclusions This data provides groundwork for an evidence-based approach to soft tissue reconstruction and management of dehiscence after spinal surgery. Timely involvement of plastic surgery in high-risk patients and utilization of evidence-based interventions such as iNPWT are essential for improving outcomes in this population.
Impact of resistive MHD plasma response on perturbation field sidebands
Orlov, D M,Evans, T E,Moyer, R A,Lyons, B C,Ferraro, N M,Park, G-Y IOP 2016 Plasma physics and controlled fusion Vol.58 No.7
<P>Single fluid linear simulations of a KSTAR RMP ELM suppressed discharge with the M3D-C<SUP>1</SUP> resistive magnetohydrodynamic code have been performed for the first time. The simulations show that the application of the <I>n</I> = 1 perturbation using the KSTAR in-vessel control coils (IVCC), which apply modest levels of <I>n</I> = 3 sidebands (~20% of the <I>n</I> = 1), leads to levels of <I>n</I> = 3 sideband that are comparable to the <I>n</I> = 1 when plasma response is included. This is due to the reduced level of screening of the rational-surface-resonant <I>n</I> = 3 component relative to the rational-surface-resonant <I>n</I> = 1 component. The <I>n</I> = 3 sidebands could play a similar role in ELM suppression on KSTAR as the toroidal sidebands (<I>n</I> = 1, 2, 4) in DIII-D <I>n</I> = 3 ELM suppression with missing I-coil segments (Paz Soldan <I>et al</I> 2014 <I>Nucl. Fusion</I> <B>54</B> 073013). This result may help to explain the uniqueness of ELM suppression with <I>n</I> = 1 perturbations in KSTAR since the effective perturbation is a mixed <I>n</I> = 1/<I>n</I> = 3 perturbation similar to <I>n</I> = 3 ELM suppression in DIII-D.</P>
Preparation of ferroelectric nanoparticles for their use in liquid crystalline colloids
Atkuri, H,Cook, G,Evans, D R,Cheon, C-I,Glushchenko, A,Reshetnyak, V,Reznikov, Yu,West, J,Zhang, K Institute of Physics Publishing in association wit 2009 Journal of optics A, Pure and applied optics Vol.11 No.2
<P>In this paper we summarize our many years of experience in the preparation and optimization of stable colloids of ferroelectric nanoparticles dispersed in an isotropic carrier and in a liquid crystal host. The colloids are of interest for use in electro-optic devices, photorefractive hybrids and nonlinear optical elements. We also outline some of the most interesting features the nanoparticles bring to liquid crystals, along with the potential of these relatively new colloids.</P>
Electrical characterization of single GaN nanowires
Stern, E,Cheng, G,Cimpoiasu, E,Klie, R,Guthrie, S,Klemic, J,Kretzschmar, I,Steinlauf, E,Turner-Evans, D,Broomfield, E,Hyland, J,Koudelka, R,Boone, T,Young, M,Sanders, A,Munden, R,Lee, T,Routenberg, D IOP Pub 2005 Nanotechnology Vol.16 No.12
<P>In this paper a statistically significant study of 1096 individual GaN nanowire (NW) devices is presented. We have correlated the effects of changing growth parameters for hot-wall chemically-vapour-deposited (HW-CVD) NWs fabricated via the vapour–liquid–solid mechanism. We first describe an optical lithographic method for creating Ohmic contacts to NW field effect transistors with both top and bottom electrostatic gates to characterize carrier density and mobility. Multiprobe measurements show that carrier modulation occurs in the channel and is not a contact effect. We then show that NW fabrication runs with nominally identical growth parameters yield similar electrical results across sample populations of >50 devices. By systematically altering the growth parameters we were able to decrease the average carrier concentration for these as-grown GaN NWs ∼10-fold, from 2.29 × 10<SUP>20</SUP> to 2.45 × 10<SUP>19</SUP> cm<SUP>−3</SUP>, and successfully elucidate the parameters that exert the strongest influence on wire quality. Furthermore, this study shows that nitrogen vacancies, and not oxygen impurities, are the dominant intrinsic dopant in HW-CVD GaN NWs.</P>