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1183395 documents, page 1 of 118340

Two years of monitoring Supergiant Fast X-ray Transients with Swift

Romano, P.; La Parola, V.; Vercellone, S.; Cusumano, G.; Sidoli, L.; Krimm, H. A.; Pagani, C.; Esposito, P.; Hoversten, E. A.; Kennea, J. A.; Page, K. L.; Burrows, D. N.; Gehrels, N. (2010)
We present two years of intense Swift monitoring of three SFXTs, IGR J16479-4514, XTE J1739-302, and IGR J17544-2619 (since October 2007). Out-of-outburst intensity-based X-ray (0.3-10keV) spectroscopy yields absorbed power laws with by hard photon indices (G~1-2). Their outburst broad-band (0.3-150 keV) spectra can be fit well with models typically used to describe the X-ray emission from accreting NSs in HMXBs. We assess how long each source spends in each state using a systematic monitorin...

Optical spectroscopy study on CeTe$_3$: evidence for multiple charge-density-wave orders

Hu, B. F.; Zheng, P.; Yuan, R. H.; Dong, T.; Cheng, B.; Chen, Z. G.; Wang, N. L. (2010)
We performed optical spectroscopy measurement on single crystal of CeTe$_3$, a rare-earth element tri-telluride charge density wave (CDW) compound. The optical spectra are found to display very strong temperature dependence. Besides a large and pronounced CDW energy gap being present already at room temperature as observed in earlier studies, the present measurement revealed the formation of another energy gap at smaller energy scale at low temperature. The second CDW gap removes the electron...

On distributed scheduling in wireless networks exploiting broadcast and network coding

Cui, Tao; Chen, Lijun; Ho, Tracey (2010)
In this paper, we consider cross-layer optimization in wireless networks with wireless broadcast advantage, focusing on the problem of distributed scheduling of broadcast links. The wireless broadcast advantage is most useful in multicast scenarios. As such, we include network coding in our design to exploit the throughput gain brought in by network coding for multicasting. We derive a subgradient algorithm for joint rate control, network coding and scheduling, which however requires centrali...

Distributed and Interactive Simulations Operating at Large Scale for Transcontinental Experimentation

Gottschalk, Thomas D.; Yao, Ke-Thia; Wagenbreth, Gene; Lucas, Robert F.; Davis, Dan M. (2010)
This paper addresses the use of emerging technologies to respond to the increasing needs for larger and more sophisticated agent-based simulations of urban areas. The U.S. Joint Forces Command has found it useful to seek out and apply technologies largely developed for academic research in the physical sciences. The use of these techniques in transcontinentally distributed, interactive experimentation has been shown to be effective and stable and the analyses of the data find parallels in the...

Wafer-Scale Nanopatterning and Translation into High-Performance Piezoelectric Nanowires

Nguyen, Thanh D.; Nagarah, John M.; Qi, Yi; Nonnenmann, Stephen S.; Morozov, Anatoli V.; Li, Simonne; Arnold, Craig B.; McAlpine, Michael C. (2010)
The development of a facile method for fabricating one-dimensional, precisely positioned nanostructures over large areas offers exciting opportunities in fundamental research and innovative applications. Large-scale nanofabrication methods have been restricted in accessibility due to their complexity and cost. Likewise, bottom-up synthesis of nanowires has been limited in methods to assemble these structures at precisely defined locations. Nanomaterials such as PbZr_xTi_(1−x)O_3 (PZT) nanowir...

Sonochemical Degradation of Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoate (PFOA) in Groundwater: Kinetic Effects of Matrix Inorganics

Cheng, Jie; Vecitis, Chad D.; Park, Hyunwoong; Mader, Brian T.; Hoffmann, Michael R. (2010)
Ultrasonic irradiation has been shown to effectively degrade perfluorinated chemicals (PFCs) such as perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) in aqueous solution. Reduced PFC sonochemical degradation rates in organic-rich groundwater taken from beneath a landfill, however, testify to the negative kinetic effects of the organic groundwater constituents. In this study, the PFOX (X = S or A) sonochemical degradation rates in a groundwater sample with organic concentrations ...

Locating Planetesimal Belts in the Multiple-planet Systems HD 128311, HD 202206, HD 82943, and HR 8799

Moro-Martin, Amaya; Malhotra, Renu; Bryden, Geoffrey; Rieke, George H.; Su, Kate Y. L.; Beichman, Charles A.; Lawler, Samantha M. (2010)
In addition to the Sun, six other stars are known to harbor multiple planets and debris disks: HD 69830, HD 38529, HD 128311, HD 202206, HD 82943, and HR 8799. In this paper, we set constraints on the location of the dust-producing planetesimals around the latter four systems. We use a radiative transfer model to analyze the spectral energy distributions of the dust disks (including two new Spitzer IRS spectra presented in this paper), and a dynamical model to assess the long-term stability o...

Notes on the nonlinear beam dynamics with strong damping in the CLIC Damping Ring

Levichev, Eugene; Piminov, Pavel; Shatilov, Dmitry (2010)
The beam is injected into the CLIC damping ring with the relatively large emittance and energy spread and then is damped to the extremely low phase volume. During the damping process the betatron frequency of each particle changes due to the space charge tune shift and nonlinear dependence of the betatron tune on the amplitude. This nonlinearity is produced by the strong chromatic sextupoles, wiggler nonlinear field components and, again, by the space charge force. During the damping, the par...

First Results from ATLAS on W and Z Boson Production in proton-proton Collisions at $\sqrt{s}$=7,$TeV

Kretzschmar, J (2010)
First measurements by the ATLAS experiment are presented of the W and Z production cross section. The observed 118 W and 125 Z candidates were produced in pp collisions at sqrt{s}=7 TeV at the LHC. The total integrated luminosities correspond to approximately 17/nb for the W and 225/nb for the Z. The total inclusive W-boson production cross section times the leptonic branching ratio is measured to be [8.5 pm 1.3(stat) pm 0.7 (syst) pm 0.9 (lumi)] nb for the W to enu channel and [10.3 pm 1.3(s...

First Candidates of Top Quark Events in the Fully Hadronic Decay Channel at the LHC

Schlieckau, Eike; Schleper, Peter (2010)
The ambitious challenge of rediscovering fully hadronically decaying top quark pairs with six jets in the final state is an important milestone to demonstrate the good understanding of the detector in reconstructing this complex process and in being able to separate this desired signal from the overwhelming QCD multi-jet background. Being able to reconstruct fully hadronically decaying top quark pairs it seems feasible to reconstruct even more complex structures from physics beyond the Standa...