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Search Results: 1 - 10 of 550002 matches for " J. S. Kline "
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Preparation of atomically clean and flat Si(100) surfaces by low-energy ion sputtering and low-temperature annealing
J. C. Kim,J. -Y. Ji,J. S. Kline,J. R. Tucker,T. -C. Shen
Physics , 2003, DOI: 10.1016/S0169-4332(03)00826-2
Abstract: Si(100) surfaces were prepared by wet-chemical etching followed by 0.3-1.5keV Ar ion sputtering, either at elevated or room temperature. After a brief anneal under ultrahigh vacuum conditions, the resulting surfaces were examined by scanning tunneling microscopy. We find that wet-chemical etching alone cannot produce a clean and flat Si(100) surface. However, subsequent 300eV Ar ion sputtering at room temperature followed by a 973K anneal yields atomically clean and flat Si(100) surfaces suitable for nanoscale device fabrication.
The role of antiphase boundaries during ion sputtering and solid phase epitaxy of Si(001)
J. C. Kim,J. -Y. Ji,J. S. Kline,J. R. Tucker,T. -C. Shen
Physics , 2003, DOI: 10.1016/S0039-6028(03)00730-1
Abstract: The Si(001) surface morphology during ion sputtering at elevated temperatures and solid phase epitaxy following ion sputtering at room temperature has been investigated using scanning tunneling microscopy. Two types of antiphase boundaries form on Si(001) surfaces during ion sputtering and solid phase epitaxy. One type of antiphase boundary, the AP2 antiphase boundary, contributes to the surface roughening. AP2 antiphase boundaries are stable up to 973K, and ion sputtering and solid phase epitaxy performed at 973K result in atomically flat Si(001) surfaces.
Neglected Tropical Diseases of Oceania: Review of Their Prevalence, Distribution, and Opportunities for Control
Kevin Kline,James S. McCarthy,Mark Pearson,Alex Loukas,Peter J. Hotez
PLOS Neglected Tropical Diseases , 2013, DOI: 10.1371/journal.pntd.0001755
Abstract: Among Oceania's population of 35 million people, the greatest number living in poverty currently live in Papua New Guinea (PNG), Fiji, Vanuatu, and the Solomon Islands. These impoverished populations are at high risk for selected NTDs, including Necator americanus hookworm infection, strongyloidiasis, lymphatic filariasis (LF), balantidiasis, yaws, trachoma, leprosy, and scabies, in addition to outbreaks of dengue and other arboviral infections including Japanese encephalitis virus infection. PNG stands out for having the largest number of cases and highest prevalence for most of these NTDs. However, Australia's Aboriginal population also suffers from a range of significant NTDs. Through the Pacific Programme to Eliminate Lymphatic Filariasis, enormous strides have been made in eliminating LF in Oceania through programs of mass drug administration (MDA), although LF remains widespread in PNG. There are opportunities to scale up MDA for PNG's major NTDs, which could be accomplished through an integrated package that combines albendazole, ivermectin, diethylcarbamazine, and azithromycin, in a program of national control. Australia's Aboriginal population may benefit from appropriately integrated MDA into primary health care systems. Several emerging viral NTDs remain important threats to the region.
Demonstration of an optical mixing technique to drive Kinetic Electrostatic Electron Nonlinear waves in laser produced plasmas
J. L. Kline,B. Afeyan,W. A. Bertsche,N. A. Kurnit,D. S. Montgomery,R. P. Johnson,C. Niemann
Physics , 2012,
Abstract: A nitrogen gas Raman cell system has been constructed to shift a 70 J 527 nm laser beam to 600 nm with 20 J of energy. The 600 nm probe and a 200J, 527 nm pump beam were optically mixed in a laser produced (gas jet) plasma. The beating of the two laser beams formed a ponderomotive force that can drive Kinetic Electrostatic Electron Nonlinear (KEEN) waves discovered in Vlasov-Poisson simulations by Afeyan et al [1,2]. KEEN waves were detected in these experiments where traditional plasma theory would declare there to be a spectral gap (ie no linear waves possible). The detection was done using Thomson scattering with probe wavelengths of both 351 nm and 263.5 nm.
Weak Localization in an Ultradense 2D Electron Gas in $δ$-doped Silicon
M. A. Zudov,C. L. Yang,R. R. Du,T. -C. Shen,J. -Y. Ji,J. S. Kline,J. R. Tucker
Physics , 2003,
Abstract: An ultradense 2D electron system can be realized by adsorbing PH$_3$ precursor molecules onto an atomically clean Si surface, followed by epitaxial Si overgrowth. By controlling the PH$_3$ coverage the carrier density of such system can easily reach $\sim 10^{14}$ cm$^{-2}$, exceeding that typically found in GaAs/AlGaAs structures by more than two-three orders of magnitude. We report on a first systematic characterization of such novel system by means of standard magnetotransport. The main findings include logarithmic temperature dependence of zero-field conductivity and logarithmic negative magnetoresistance. We analyzed the results in terms of scaling theory of localization in two dimensions.
TNF Inhibits Notch-1 in Skeletal Muscle Cells by Ezh2 and DNA Methylation Mediated Repression: Implications in Duchenne Muscular Dystrophy
Swarnali Acharyya,Sudarshana M. Sharma,Alfred S. Cheng,Katherine J. Ladner,Wei He,William Kline,Huating Wang,Michael C. Ostrowski,Tim H. Huang,Denis C. Guttridge
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0012479
Abstract: Classical NF-κB signaling functions as a negative regulator of skeletal myogenesis through potentially multiple mechanisms. The inhibitory actions of TNFα on skeletal muscle differentiation are mediated in part through sustained NF-κB activity. In dystrophic muscles, NF-κB activity is compartmentalized to myofibers to inhibit regeneration by limiting the number of myogenic progenitor cells. This regulation coincides with elevated levels of muscle derived TNFα that is also under IKKβ and NF-κB control.
Agrimonia villosa (Rosaceae), nuevo registro para la Argentina
Keller,Héctor A; Kline,Genevieve J;
Darwiniana , 2008,
Abstract: a first collection of agrimonia villosa (rosaceae) for the argentinian flora is reported for misiones province. a description, illustration, and distribution map of the specimens are given. a key to distinguish a. villosa from a. parviflora is provided.
Héctor A. Keller,Genevieve J. Kline
Darwiniana , 2008,
Abstract: Sobre la base de ejemplares coleccionados en la provincia de Misiones, se menciona por primera vez para la flora argentina a Agrimonia villosa (Rosaceae). Se presenta una descripción de la especie, se la ilustra mediante fotografías, se agrega un mapa de su distribución en la Argentina y se provee una clave para distinguir Agrimonia villosa de Agrimonia parviflora.
Sub-micrometer epitaxial Josephson junctions for quantum circuits
Jeffrey S. Kline,Michael R. Vissers,Fabio C. S. da Silva,David S. Wisbey,Martin Weides,Terence J. Weir,Benjamin Turek,Danielle A. Braje,William D. Oliver,Yoni Shalibo,Nadav Katz,Blake R. Johnson,Thomas A. Ohki,David P. Pappas
Physics , 2011, DOI: 10.1088/0953-2048/25/2/025005
Abstract: We present a fabrication scheme and testing results for epitaxial sub-micrometer Josephson junctions. The junctions are made using a high-temperature (1170 K) "via process" yielding junctions as small as 0.8 mu m in diameter by use of optical lithography. Sapphire (Al2O3) tunnel-barriers are grown on an epitaxial Re/Ti multilayer base-electrode. We have fabricated devices with both Re and Al top electrodes. While room-temperature (295 K) resistance versus area data are favorable for both types of top electrodes, the low-temperature (50 mK) data show that junctions with the Al top electrode have a much higher subgap resistance. The microwave loss properties of the junctions have been measured by use of superconducting Josephson junction qubits. The results show that high subgap resistance correlates to improved qubit performance.
Behavior, Color Change and Time for Sexual Inversion in the Protogynous Grouper (Epinephelus adscensionis)
Richard J. Kline,Izhar A. Khan,G. Joan Holt
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019576
Abstract: Hermaphroditism, associated with territoriality and dominance behavior, is common in the marine environment. While male sex-specific coloration patterns have been documented in groupers, particularly during the spawning season, few data regarding social structure and the context for these color displays are available. In the present study, we define the social structure and male typical behavior of rock hind (Epinephelus adscensionis) in the wild. In addition, we detail the captive conditions and time period necessary to induce the onset of the sex-specific coloration and sexual change. At six oil production platform locations in the Gulf of Mexico, rock hind social group size and typical male rock hind social behavior were documented. We observed a rapid temporary color display in rock hind that could be turned on and off within three seconds and was used for confronting territory intruders and displays of aggression towards females. The male-specific “tuxedo” pattern consists of a bright yellow tail, a body with alternating dark brown and white patches and a dark bar extending from the upper mandible to the operculum. Identification and size ranges of male, female and intersex fish collected from oil platforms were determined in conjunction with gonadal histology. Rock hind social order is haremic with one dominant male defending a territory and a linear dominance hierarchy among individuals. In five captive experiments, the largest remaining female rock hind displayed the male specific color pattern within 32d after dominant male removal from the social group. To our knowledge, this is the first evidence in a grouper species of color patterning used to display territoriality and dominance outside of spawning aggregations. The behavioral paradigm described here is a key advance that will enable mechanistic studies of this complex sex change process.
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