cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Expectations, Perceptions, and Misconceptions of Personal Firewalls
Creators: name: Raja, Fahimeh
name: Hawkey, Kirstie
name: Jaferian, Pooya
name: Beznosov, Konstantin
name: Booth, Kellogg S.
Publisher: name: Zenodo
Year: 2010
Subjects: Usable security
Personal firewall

description: In this research, our goal is to better understand users' knowledge, expectations, perceptions, and misconceptions of personal firewalls. We conducted interviews with 30 participants and analyzed the data using qualitative description. In this paper we present our results and examine their implications for the design of personal firewalls.
Leaps and bounds towards scale separation
Creators: name: De Luca, G. Bruno
name: Tomasiello, Alessandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In a broad class of gravity theories, the equations of motion for vacuum compactifications give a curvature bound on the Ricci tensor minus a multiple of the Hessian of the warping function. Using results in so-called Bakry--Émery geometry, we put rigorous general bounds on the KK scale in gravity compactifications in terms of the reduced Planck mass or the internal diameter. We reexamine in this light the local behavior in type IIA for the class of supersymmetric solutions most promising for scale separation. We find that the local O6-plane behavior cannot be smoothed out as in other local examples; it generically turns into a formal partially smeared O4.
description: Added references, improved discussion on singularities
Precise Timing of the X-ray Pulsar 1E 1207.4-5209: A Steady Neutron Star Weakly Magnetized at Birth
Creators: name: Gotthelf, E. V.
name: Halpern, J. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze all X-ray timing data on 1E 1207.4-5209 in supernova remnant PKS 1209-51/52 gathered in 2000-2005, and find a highly stable rotation with P=424.130451(4) ms and period derivative of (9.6 +/- 9.4)E-17 s/s. This refutes previous claims of large timing irregularities in these data. In the dipole spin-down formalism, the 2-sigma upper limit on period derivative implies an energy loss rate < 1.5E32 ergs/s, surface magnetic field strength B_p < 3.5E11 G, and characteristic age tau > 24 Myr. This tau exceeds the remnant age by 3 orders of magnitude, requiring that the pulsar was born spinning at its present period. The X-ray luminosity of 1E 1207.4-5209, L(bol) ~= 2E33 ergs/s at 2 kpc, exceeds its spin-down energy loss, implying that L(bol) derives from residual cooling, and perhaps partly from accretion of supernova debris. The upper limit on B_p is small enough to favor the electron cyclotron model for at least one of the prominent absorption lines in its soft X-ray spectrum. This is the second demonstrable case of a pulsar born spinning slowly and with a weak B-field, after PSR J1852+0040 in Kesteven 79.
description: 5 pages, 2 figure, Latex, emulateapj style. Submitted to ApJ Letters
Chiral Symmetry of Double-Walled Carbon Nanotubes detected in First-principles Optical Absorption Spectra
Creators: name: Yang, Xiaoping
name: Chen, Jiangwei
name: Jiang, Hui
name: Dong, Jinming
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The linear polarizability absorption spectra of the double-walled carbon nanotubes (DWNTs) have been calculated by using the tight-binding (TB) model and sum-over-state (SOS) method, supplemented by the first principles CASTEP calculations. It is found that the chiral symmetries of both outer and inner tubes in the DWNTs can always be identified distinctly by the characteristic peaks in the absorption spectra of the DWNTs, no matter what kind of the outer tube is, offering a powerful experimental tool to measure precisely the chiral angle of the inner tube of a DWNT.
description: 10 pages, 5 figures
Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves
Creators: name: Wang, Xian-Yu
name: Wang, Yong-Hao
name: Wang, Songhu
name: Wu, Zhen-Yu
name: Rice, Malena
name: Zhou, Xu
name: Hinse, Tobias C.
name: Liu, Hui-Gen
name: Ma, Bo
name: Peng, Xiyan
name: Zhang, Hui
name: Yu, Cong
name: Zhou, Ji-Lin
name: Laughlin, Gregory
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present 127 new transit light curves for 39 hot Jupiter systems, obtained over the span of five years by two ground-based telescopes. A homogeneous analysis of these newly collected light curves together with archived spectroscopic, photometric, and Doppler velocimetric data using EXOFASTv2 leads to a significant improvement in the physical and orbital parameters of each system. All of our stellar radii are constrained to accuracies of better than 3\%. The planetary radii for 37 of our 39 targets are determined to accuracies of better than $5\%$. Compared to our results, the literature eccentricities are preferentially overestimated due to the Lucy-Sweeney bias. Our new photometric observations therefore allow for significant improvement in the orbital ephemerides of each system. Our correction of the future transit window amounts to a change exceeding $10\,{\rm min}$ for ten targets at the time of JWST's launch, including a $72\,{\rm min}$ change for WASP-56. The measured transit mid-times for both literature light curves and our new photometry show no significant deviations from the updated linear ephemerides, ruling out in each system the presence of companion planets with masses greater than $0.39 - 5.0\, rm M_{\oplus}$, $1.23 - 14.36\, \rm M_{\oplus}$, $1.65 - 21.18\, \rm M_{\oplus}$, and $0.69 - 6.75\, \rm M_{\oplus}$ near the 1:2, 2:3, 3:2, and 2:1 resonances with the hot Jupiters , respectively, at a confidence level of $\pm 1\,σ$. The absence of resonant companion planets in the hot Jupiter systems is inconsistent with the conventional expectation from disk migration.
description: 28 pages,9 figures, accepted for publication in ApJS
Spin-Injection-Generated Shock Waves and Solitons in a Ferromagnetic Thin Film
Creators: name: Hu, Mingyu
name: Iacocca, Ezio
name: Hoefer, Mark
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Unsteady nonlinear magnetization dynamics are studied in an easy-plane ferromagnetic channel subject to spin injection at one edge. The model Landau-Lifshitz equation is known to support steady-state solutions, termed dissipative exchange flows (DEFs) or spin superfluids. In this work, by means of numerical simulations and theoretical analysis, we provide a full description of the injection-induced, large-amplitude, nonlinear magnetization dynamics up to the steady state. The dynamics prior to reaching steady state are driven by spin injection, the perpendicular applied magnetic field, the exchange interaction, and local demagnetizing fields. We show that the dynamics take well-defined profiles in the form of rarefaction waves (RW), dispersive shock waves (DSW), and solitons. The combination of these building blocks depends on the interplay between the spin injection strength and the applied magnetic field. A solitonic feature at the injection boundary, signaling the onset of the magnetic "supersonic" condition at the injection edge, rapidly develops and persists in the steady-state configuration of a contact soliton DEF. We also demonstrate the existence of sustained soliton-train dynamics in long time that can only arise in a nonzero applied magnetic field scenario. The dynamical evolution of spin-injection-induced magnetization dynamics presented here may help guide observations in long-distance spin transport experiments.
description: 5 pages, 4 figures, INTERMAG 2021 conference-related paper
The Friedel oscillations in the presence of transport currents
Creators: name: Gorczyca, Anna
name: Maska, Maciej M.
name: Mierzejewski, Marcin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the Friedel oscillations in a nanowire coupled to two macroscopic electrodes of different potentials. We show that the wave-length of the density oscillations monotonically increases with the bias voltage, whereas the amplitude and the spatial decay exponent of the oscillations remain intact. Using the nonequilibrium Keldysh Green functions, we derive an explicit formula that describes voltage dependence of the wave-length of the Friedel oscillations.
description: 5 pages, 3 figures, RevTeX
Unitarisation dependence of diffractive scattering in light of high-energy collider data
Creators: name: Vanthieghem, Arno
name: Bhattacharya, Atri
name: Oueslati, Rami
name: Cudell, Jean-René
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the consequences of high-energy collider data on the best fits to total, elastic, inelastic, and single-diffractive cross sections for $pp$ and $p \bar{p}$ scattering using different unitarisation schemes. We find that the data are well fitted both by eikonal and U-matrix schemes, but that diffractive data prefer the U-matrix. Both schemes may be generalised by means of an additional parameter; however, this yields only marginal improvements to the fits. We provide estimates for $ρ$, the ratio of the real part to the imaginary part of the elastic amplitude, for the different fits. We comment on the effect of the different schemes on present and future cosmic ray data.
description: to be published in JHEP; 15 pages, 2 figures
New Ultraviolet Observations of AM CVn
Creators: name: Wade, Richard A.
name: Eracleous, Michael
name: Flohic, Helene M. L. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have obtained observations of the ultraviolet spectrum of AM CVn, an ultra-short-period helium cataclysmic variable, using the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST). We obtained data in time-tag mode during two consecutive orbits of HST, covering 1600-3150 and 1140-1710 Angstrom, respectively. The mean spectrum is approximately flat in f-nu. The absorption profiles of the strong lines of N V, Si IV, C IV, He II, and N IV are blue-shifted and in some cases asymmetric, evidencing a wind that is partly occulted by the accretion disk. There is weak red-shifted emission from N V and He II. The profiles of these lines vary mildly with time. The light curve shows a decline of ~20% over the span of the observations. There is also flickering and a 27 s (or 54 s) "dwarf nova oscillation", revealed in a power-spectrum analysis. The amplitude of this oscillation is larger at shorter wavelengths. We assemble and illustrate the spectral energy distribution (s.e.d.) of AM CVn from the ultraviolet to the near-infrared. Modeling the accretion phenomenon in this binary system can in principle lead to a robust estimate of the mass accretion rate on to the central white dwarf, which is of great interest in characterizing the evolutionary history of the binary system. Inferences about the mass accretion rate depend strongly on the local radiative properties of the disk, as we illustrate. Uncertainty in the distance of AM CVn and other parameters of the binary system presently limit the ability to confidently infer the mass accretion rate.
description: Accepted by the Astronomical Journal
Understanding and minimizing resonance frequency deviations on a 4-inch kilo-pixel kinetic inductance detector array
Creators: name: Shu, S.
name: Calvo, M.
name: Goupy, J.
name: Leclercq, S.
name: Catalano, A.
name: Bideaud, A.
name: Monfardini, A.
name: Driessen, E. F. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: One of the advantages of kinetic inductance detectors is their intrinsic frequency domain multiplexing capability. However, fabrication imperfections usually give rise to resonance frequency deviations, which create frequency collision and limit the array yield. Here we study the resonance frequency deviation of a 4-inch kilo-pixel lumped-element kinetic inductance detector (LEKID) array using optical mapping. Using the measured resonator dimensions and film thickness, the fractional deviation can be explained within $\pm 25\times 10^{-3}$, whereas the residual deviation is due to variation of electric film properties. Using the capacitor trimming technique, the fractional deviation is decreased by a factor of 14. The yield of the trimming process is found to be 97%. The mapping yield, measured under a 110~K background, is improved from 69% to 76%, which can be further improved to 81% after updating our readout system. With the improvement in yield, the capacitor trimming technique may benefit future large-format LEKID arrays.
description: 6 pages, 7 figures, MAJOR update
3-phonon scattering pathways for vibrational energy transfer in crystalline RDX
Creators: name: Kumar, Gaurav
name: VanGessel, Francis G.
name: Munday, Lynn B.
name: Chung, Peter W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: A long-held belief is that shock energy induces initiation of an energetic material through an indirect energy up-pumping mechanism involving phonon scattering through doorway modes. In this paper, a 3-phonon theoretical analysis of energy up-pumping in RDX is presented that involves both direct and indirect pathways where the direct energy transfer dominates. The calculation considers individual phonon modes which are then analyzed in bands. Scattering is handled up to the third order term in the Hamiltonian based on Fermi's Golden Rule. On average, modes with frequencies up to 90 cm-1 scatter quickly and redistribute the energy to all the modes. This direct stimulation occurs rapidly, within 0.16 ps, and involves distortions to NN bonds. Modes from 90 to 1839 cm-1 further up-pump the energy to NN bond distortion modes through an indirect route within 5.6 ps. The highest frequency modes have the lowest contribution to energy transfer due to their lower participation in phonon-phonon scattering. The modes stimulated directly by the shock with frequencies up to 90 cm-1 are estimated to account for 52 to 89\% of the total energy transfer to various NN bond distorting modes.
description: There is a significant error in this paper. Please refer to the corrected version that is now available in the corresponding journal article https://pubs.acs.org/doi/10.1021/acs.jpca.1c03225
Ultrasensitive chemiluminescence bioassays based on microfluidics in miniaturized analytical devices
Creators: name: Zangheri, Martina <1987>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: CHIM/01 Chimica analitica

description: The activity carried out during my PhD was principally addressed to the development of portable microfluidic analytical devices based on biospecific molecular recognition reactions and CL detection. In particular, the development of biosensors required the study of different materials and procedures for their construction, with particular attention to the development of suitable immobilization procedures, fluidic systems and the selection of the suitable detectors. Different methods were exploited, such as gene probe hybridization assay or immunoassay, based on different platform (functionalized glass slide or nitrocellulose membrane) trying to improve the simplicity of the assay procedure. Different CL detectors were also employed and compared with each other in the search for the best compromise between portability and sensitivity. The work was therefore aimed at miniaturization and simplification of analytical devices and the study involved all aspects of the system, from the analytical methodology to the type of detector, in order to combine high sensitivity with easiness-of-use and rapidity. The latest development involving the use of smartphone as chemiluminescent detector paves the way for a new generation of analytical devices in the clinical diagnostic field thanks to the ideal combination of sensibility a simplicity of the CL with the day-by-day increase in the performance of the new generation smartphone camera. Moreover, the connectivity and data processing offered by smartphones can be exploited to perform analysis directly at home with simple procedures. The system could eventually be used to monitor patient health and directly notify the physician of the analysis results allowing a decrease in costs and an increase in the healthcare availability and accessibility.
An Ontological Analysis of a Proposed Theory for Software Development
Creators: name: Kirk, Diana
name: MacDonell, Stephen G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: There is growing acknowledgement within the software engineering community that a theory of software development is needed to integrate the myriad methodologies that are currently popular, some of which are based on opposing perspectives. We have been developing such a theory for a number of years. In this paper, we overview our theory and report on a recent ontological analysis of the theory constructs. We suggest that, once fully developed, this theory, or one similar to it, may be applied to support situated software development, by providing an overarching model within which software initiatives might be categorised and understood. Such understanding would inevitably lead to greater predictability with respect to outcomes.
description: Book Chapter, 8 pages, 1 table. arXiv admin note: substantial text overlap with arXiv:2103.03400
Effect of a Zeeman field on the superconductor-ferromagnet transition in metallic grains
Creators: name: Schmidt, S.
name: Alhassid, Y.
name: Van Houcke, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the competition between pairing correlations and ferromagnetism in small metallic grains in the presence of a Zeeman field. Our analysis is based on the universal Hamiltonian, valid in the limit of large Thouless conductance. We show that the coexistence regime of superconducting and ferromagnetic correlations can be made experimentally accessible by tuning an external Zeeman field. We compare the exact solution of the model with a mean-field theory and find that the latter cannot describe pairing correlations in the intermediate regime. We also study the occurrence of spin jumps across the phase boundary separating the superconducting and coexistence regimes.
description: 6 pages, 4 figures
Temperature Equilibration Rate with Fermi-Dirac Statistics
Creators: name: Brown, Lowell S.
name: Singleton, Robert L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We calculate the electron-ion temperature equilibration rate in a fully ionized, weakly to moderately coupled plasma, using an exact treatment of the Fermi-Dirac electrons. The temperature is sufficiently high so that the quantum-mechanical Born approximation to the scattering is valid. At the heart of this calculation lies the method of dimensional continuation, a technique that we borrow from quantum field theory and use in a novel fashion to regulate the kinetic equations in a consistent manner. We can then perform a systematic perturbation expansion and thereby obtain a finite first-principles result to leading and next-to-leading order. Unlike model building, this systematic calculation yields an estimate of its own error and thus prescribes its domain of applicability. The calculational error is small for a weakly to moderately coupled plasma, for which our result is nearly exact. It should also be emphasized that our calculation becomes unreliable for a strongly coupled plasma, where the perturbative expansion that we employ breaks down, and one must then utilize model building and computer simulations. Besides providing new and potentially useful results, we use this calculation as an opportunity to explain the method of dimensional continuation in a pedagogical fashion. Interestingly, in the regime of relevance for many inertial confinement fusion experiments, the degeneracy corrections are comparable in size to the subleading quantum correction below the Born approximation. For consistency, we therefore present this subleading quantum-to-classical transition correction in addition to the degeneracy correction.
description: 27 pages, double column format, 4 figures, several typos fixed
The Wiretap Channel with Feedback: Encryption over the Channel
Creators: name: Lai, Lifeng
name: Gamal, Hesham El
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In this work, the critical role of noisy feedback in enhancing the secrecy capacity of the wiretap channel is established. Unlike previous works, where a noiseless public discussion channel is used for feedback, the feed-forward and feedback signals share the same noisy channel in the present model. Quite interestingly, this noisy feedback model is shown to be more advantageous in the current setting. More specifically, the discrete memoryless modulo-additive channel with a full-duplex destination node is considered first, and it is shown that the judicious use of feedback increases the perfect secrecy capacity to the capacity of the source-destination channel in the absence of the wiretapper. In the achievability scheme, the feedback signal corresponds to a private key, known only to the destination. In the half-duplex scheme, a novel feedback technique that always achieves a positive perfect secrecy rate (even when the source-wiretapper channel is less noisy than the source-destination channel) is proposed. These results hinge on the modulo-additive property of the channel, which is exploited by the destination to perform encryption over the channel without revealing its key to the source. Finally, this scheme is extended to the continuous real valued modulo-$Λ$ channel where it is shown that the perfect secrecy capacity with feedback is also equal to the capacity in the absence of the wiretapper.
description: Submitted to IEEE Transactions on Information Theory
Deep Contrast and Companion Detection Using the EvWaCo Testbed Equipped with an Achromatic Focal Plane Mask and an Adjustable Inner Working Angle
Creators: name: Alagao, M. A.
name: Kawinkij, A.
name: Buisset, C.
name: Prasit, A.
name: Lépine, T.
name: Rabbia, Y.
name: Berdeu, A.
name: Thiébaut, É.
name: Langlois, M.
name: Tallon, M.
name: Awiphan, S.
name: Semenko, E.
name: Rittipruk, P.
name: Mkrtichian, D.
name: Leckngam, A.
name: Thuammasorn, G.
name: Kaewsamoeta, P.
name: Inpan, A.
name: Kuha, T.
name: Laoyang, A.
name: Somboonchai, W.
name: Kanthum, S.
name: Poshyachinda, S.
name: Soonthornthum, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The evanescent wave coronagraph uses the principle of frustrated total internal reflection (FTIR) to suppress the light coming from the star and study its close environment. Its focal plane mask is composed of a lens and a prism placed in contact with each other to produce the coronagraphic effect. In this paper, we present the experimental results obtained using an upgraded focal plane mask of the Evanescent Wave Coronagraph (EvWaCo). These experimental results are also compared to the theoretical performance of the coronagraph obtained through simulations. Experimentally, we reach a raw contrast equal to a few $10^{-4}$ at a distance equal to 3 $λ/D$ over the full I-band ($λ_c =$ $800$ $nm$, $Δλ/λ \approx 20\%$) and equal to 4 $λ/D$ over the full R-band ($λ_c =$ $650$ $nm$, $Δλ/λ \approx 23\%$) in unpolarized light. However, our simulations show a raw contrast close to $10^{-4}$ over the full I-band and R-band at the same distance, thus, confirming the theoretical achromatic advantage of the coronagraph. We also verify the stability of the mask through a series of contrast measurements over a period of 8 months. Furthermore, we measure the sensitivity of the coronagraph to the lateral and longitudinal misalignment of the focal plane mask, and to the lateral misalignment of the Lyot stop.
description: 27 pages, 19 figures, accepted by AJ
I Zw 18 revisited with HST/ACS and Cepheids: New Distance and Age
Creators: name: Aloisi, A.
name: Clementini, G.
name: Tosi, M.
name: Annibali, F.
name: Contreras, R.
name: Fiorentino, G.
name: Mack, J.
name: Marconi, M.
name: Musella, I.
name: Saha, A.
name: Sirianni, M.
name: van der Marel, R. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new V and I-band HST/ACS photometry of I Zw 18, the most metal-poor blue compact dwarf (BCD) galaxy in the nearby universe. It has been argued in the past that I Zw 18 is a very young system that started forming stars only < 500 Myr ago, but other work has hinted that older (> 1 Gyr) red giant branch (RGB) stars may also exist. Our new data, once combined with archival HST/ACS data, provide a deep and uncontaminated optical color-magnitude diagram (CMD) that now strongly indicates an RGB. The RGB tip (TRGB) magnitude yields a distance modulus (m-M)_0 = 31.30 +/- 0.17, i.e., D = 18.2 +/- 1.5 Mpc. The time-series nature of our observations allows us to also detect and characterize for the first time three classical Cepheids in I~Zw~18. The time-averaged Cepheid and  magnitudes are compared to the VI reddening-free Wesenheit relation predicted from new non-linear pulsation models specifically calculated at the metallicity of I Zw 18. For the one bona-fide classical Cepheid with a period of 8.63 days this implies a distance modulus (m-M)_0 = 31.42 +/- 0.26. The other two Cepheids have unusually long periods (125.0 and 129.8 d) but are consistent with this distance. The coherent picture that emerges is that I Zw 18 is older and farther away than previously believed. This rules out the possibility that I Zw 18 is a truly primordial galaxy formed recently (z < 0.1) in the local universe.
description: 12 pages, 3 figures, submitted to ApJL
Scaling Behaviors of Graphene Nanoribbon FETs: A Three Dimensional Quantum Simulation Study
Creators: name: Ouyang*, Yijian
name: Yoon*, Youngki
name: Guo, Jing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The scaling behaviors of graphene nanoribbon (GNR) Schottky barrier field-effect transistors (SBFETs) are studied by solving the non-equilibrium Green's function (NEGF) transport equation in an atomistic basis set self-consistently with a three-dimensional Poisson equation. The armchair edge GNR channel shares similarities with a zigzag CNT, but it has a different geometry and quantum confinement boundary condition in the transverse direction. The results indicate that the I-V characteristics are ambipolar and strongly depend on the GNR width because the bandgap of the GNR is approximately inversely proportional to its width, which agrees with recent experiments. A multiple gate geometry improves immunity to short channel effects, but it offers smaller improvement than it does for Si MOSFETs in terms of the on-current and transconductance. Reducing the oxide thickness is more useful for improving transistor performance than using a high-k gate insulator. Significant increase of the minimal leakage current is observed when the channel length is scaled below 10nm because the small effective mass facilitates strong source-drain tunneling. The GNRFET, therefore, does not promise extending the ultimate scaling limit of Si MOSFETs. The intrinsic switching speed of a GNR SBFET, however, is several times faster than that of Si MOSFETs, which could lead to promising high speed electronics applications, where the large leakage of GNR SBFETs is of less concern.
description: *These authors contributed equally to this work. 33 pages, 12 figures. The replacement of this manuscript is because a typo found in program which changes the quantitative results by factor of 2. The qualitative features and conclusions are not changed
NNLO QCD predictions for the H -> WW -> l l nu nu signal at the LHC
Creators: name: Anastasiou, Charalampos
name: Dissertori, Guenther
name: Stoeckli, Fabian
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a first computation of the NNLO QCD cross section at the LHC for the production of four leptons from a Higgs boson decaying into W bosons. We study the cross section for a Higgs boson mass Mh = 165 GeV; around this value a Standard Model Higgs boson decays almost exclusively into W-pairs. We apply all nominal experimental cuts on the final state leptons and the associated jet activity and study the magnitude of higher-order effects up to NNLO on all kinematic variables which are constrained by experimental cuts. We find that the magnitude of the higher-order corrections varies significantly with the signal selection cuts. As a main result we give the value of the cross section at NNLO with all selection cuts envisaged for the search for the Higgs boson.
description: typos corrected, version accepted in JHEP
The localization spread and polarizability of rings and periodic chains
Creators: name: Angeli, Celestino
name: Bendazzoli, Gian Luigi
name: Evangelisti, Stefano
name: Berger, J. Arjan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The localization spread gives a criterion to decide between metallic versus insulating behaviour of a material. It is defined as the second moment cumulant of the many-body position operator, divided by the number of electrons. Different operators are used for systems treated with Open or Periodic Boundary Conditions. In particular, in the case of periodic systems, we use the complex-position definition, that was already used in similar contexts for the treatment of both classical and quantum situations. In this study, we show that the localization spread evaluated on a finite ring system of radius $R$ with Open Boundary Conditions leads, in the large $R$ limit, to the same formula derived by Resta et al. for 1D systems with periodic Born-von Kármán boundary conditions. A second formula, alternative to the Resta's one, is also given, based on the sum-over-state formalism, allowing for an interesting generalization to polarizability and other similar quantities.
Search for Exclusive Gamma Gamma Production in Hadron-Hadron Collisions
Creators: name: CDF Collaboration
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We have searched for exclusive 2-photon production in proton-antiproton collisions at sqrt{s} = 1.96 TeV, using 532/pb of integrated luminosity taken by the Run II Collider Detector at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E_T > 5 GeV and pseudorapidity |eta|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with gamma-gamma, pi0-pi0, or eta-eta production. The probability that other processes fluctuate to 3 events or more is 1.7x10^-4. An upper limit on the cross section of p+pbar --> p+gamma-gamma+pbar is set at 410 fb with 95% confidence level.
description: 7 pages, 2 figures. Submitted to Phys.Rev.Lett
Nonlinearity-assisted quantum tunneling in a matter-wave interferometer
Creators: name: Lee, Chaohong
name: Ostrovskaya, Elena A.
name: Kivshar, Yuri S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the {\em nonlinearity-assisted quantum tunneling} and formation of nonlinear collective excitations in a matter-wave interferometer, which is realised by the adiabatic transformation of a double-well potential into a single-well harmonic trap. In contrast to the linear quantum tunneling induced by the crossing (or avoided crossing) of neighbouring energy levels, the quantum tunneling between different nonlinear eigenstates is assisted by the nonlinear mean-field interaction. When the barrier between the wells decreases, the mean-field interaction aids quantum tunneling between the ground and excited nonlinear eigenstates. The resulting {\em non-adiabatic evolution} depends on the input states. The tunneling process leads to the generation of dark solitons, and the number of the generated dark solitons is highly sensitive to the matter-wave nonlinearity. The results of the numerical simulations of the matter-wave dynamics are successfully interpreted with a coupled-mode theory for multiple nonlinear eigenstates.
description: 11 pages, 6 figures, accept for publication in J. Phys. B
A Model for Line Absorption and Emission from Turbulent Mixing Layers
Creators: name: Tan, Brent
name: Oh, S. Peng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Turbulent mixing layers (TMLs) are ubiquitous in multiphase gas. They can potentially explain observations of high ions such as O VI, which have significant observed column densities despite short cooling times. Previously, we showed that global mass, momentum and energy transfer between phases mediated by TMLs is not sensitive to details of thermal conduction or numerical resolution. By contrast, we show here that observables such as temperature distributions, column densities and line ratios are sensitive to such considerations. We explain the reason for this difference. We develop a prescription for applying a simple 1D conductive-cooling front model which quantitatively reproduces 3D hydrodynamic simulation results for column densities and line ratios, even when the TML has a complex fractal structure. This enables sub-grid absorption and emission line predictions in large scale simulations. The predicted line ratios are in good agreement with observations, while observed column densities require numerous mixing layers to be pierced along a line of sight.
description: Accepted for publication in MNRASL; 5 pages, 6 figures
Hartree-Fock study of the moiré Hubbard model for twisted bilayer transition metal dichalcogenides
Creators: name: Zang, Jiawei
name: Wang, Jie
name: Cano, Jennifer
name: Millis, Andrew J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Twisted bilayer transition metal dichalcogenides have emerged as important model systems for the investigation of correlated electron physics because their interaction strength, carrier concentration, band structure, and inversion symmetry breaking are controllable by device fabrication, twist angle, and most importantly, gate voltage, which can be varied in situ. The low energy physics of some of these materials has been shown to be described by a "moiré Hubbard model" generalized from the usual Hubbard model by the addition of strong, tunable spin orbit coupling and inversion symmetry breaking. In this work, we use a Hartree-Fock approximation to reach a comprehensive understanding of the moiré Hubbard model on the mean field level. We determine the magnetic and metal-insulator phase diagrams, and assess the effects of spin orbit coupling, inversion symmetry breaking, and the tunable van Hove singularity. We also consider the spin and orbital effects of applied magnetic fields. This work provides guidance for experiments and sets the stage for beyond mean-field calculations.
description: 11 pages, 11 figures
Spin-orbit torque characterization in a nutshell
Creators: name: Nguyen, Minh-Hai
name: Pai, Chi-Feng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Spin current and spin torque generation through the spin-orbit interactions in solids, of bulk or interfacial origin, is at the heart of spintronics research. The realization of spin-orbit torque (SOT) driven magnetic dynamics and switching in diverse magnetic heterostructures also pave the way for developing SOT magnetoresistive random access memory and other novel SOT memory and logic devices. Of scientific and technological importance are accurate and efficient SOT quantification techniques, which have been abundantly developed in the last decade. In this article, we summarize popular techniques to experimentally quantify SOTs in magnetic heterostructures at micro- and nano-scale. For each technique, we give an overview of its principle, variations, strengths, shortcomings, error sources, and any cautions in usage. Finally, we discuss the remaining challenges in understanding and quantifying the SOTs in heterostructures.
Hodge theory of holomorphic vector bundle on compact Kähler hyperbolic manifold
Creators: name: Huang, Teng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Let $E$ be a holomorphic vector bundle over a compact Kähler manifold $(X,ω)$ with negative sectional curvature $sec\leq -K<0$, $Δ_{E}$ be the Chern connection on $E$. In this article we show that if $C:=|[Λ,iΘ(E)]|\leq c_{n}K$, then $(X,E)$ satisfy a family of Chern number inequalities. The main idea in our proof is study the $L^{2}$ $\bar{\partial}_{\tilde{E}}$-harmonic forms on lifting bundle $\tilde{E}$ over the universal covering space $\tilde{X}$. We also observe that there is a closely relationship between the eigenvalue of the Laplace-Beltrami operator $Δ_{\bar{\partial}_{\tilde{E}}}$ and the Euler characteristic of $X$. Precisely, if there is a line bundle $L$ on $X$ such that $χ^{p}(X,L^{\otimes m})$ is not constant for some integers $p\in[0,n]$, then the Euler characteristic of $X$ satisfies $(-1)^{n}χ(X)\geq (n+1)+\lfloor\frac{c_{n}K}{2nC} \rfloor$.
description: 32 pages, Appeared in IMRN
PPT-SASMM: Scalable Analytical Shared Memory Model: Predicting the Performance of Multicore Caches from a Single-Threaded Execution Trace
Creators: name: Barai, Atanu
name: Chennupati, Gopinath
name: Santhi, Nandakishore
name: Badawy, Abdel-Hameed
name: Arafa, Yehia
name: Eidenbenz, Stephan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: Performance modeling of parallel applications on multicore processors remains a challenge in computational co-design due to multicore processors' complex design. Multicores include complex private and shared memory hierarchies. We present a Scalable Analytical Shared Memory Model (SASMM). SASMM can predict the performance of parallel applications running on a multicore. SASMM uses a probabilistic and computationally-efficient method to predict the reuse distance profiles of caches in multicores. SASMM relies on a stochastic, static basic block-level analysis of reuse profiles. The profiles are calculated from the memory traces of applications that run sequentially rather than using multi-threaded traces. The experiments show that our model can predict private L1 cache hit rates with 2.12% and shared L2 cache hit rates with about 1.50% error rate.
description: 11 pages, 5 figures. arXiv admin note: text overlap with arXiv:1907.12666
Pion Production by Protons on a Thin Beryllium Target at 6.4, 12.3, and 17.5 GeV/c Incident Proton Momenta
Creators: name: E910 Collaboration
name: Chemakin, I.
name: Cianciolo, V.
name: Cole, B. A.
name: Fernow, R. C.
name: Frawley, A. D.
name: Gilkes, M.
name: Gushue, S.
name: Hartouni, E. P.
name: Hiejima, H.
name: Justice, M.
name: Kang, J. H.
name: Kirk, H. G.
name: Link, J. M.
name: Maeda, N.
name: McGrath, R. L.
name: Mioduszewski, S.
name: Monroe, J.
name: Morrison, D.
name: Moulson, M.
name: Namboodiri, M. N.
name: Rai, G.
name: Read, K.
name: Remsberg, L.
name: Rosati, M.
name: Shin, Y.
name: Soltz, R. A.
name: Sorel, M.
name: Sorensen, S.
name: Thomas, J. H.
name: Torun, Y.
name: Winter, D. L.
name: Yang, X.
name: Zajc, W. A.
name: Zhang, Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: An analysis of inclusive pion production in proton-beryllium collisions at 6.4, 12.3, and 17.5 GeV/c proton beam momentum has been performed. The data were taken by Experiment 910 at the Alternating Gradient Synchrotron at the Brookhaven National Laboratory. The differential $π^+$ and $π^-$ production cross sections ($d^2σ/dpdΩ$) are measured up to 400 mRad in $θ_π$ and up to 6 GeV/c in $p_π$. The measured cross section is fit with a Sanford-Wang parameterization.
description: Submitted to Phys. Rev. C
Le pale d'altare della chiesa di San Francesco a Staffolo / The altarpieces of the church of San Francesco in Staffolo
Creators: name: Cerioni, Chiara
Publisher: name: eum
Year: 2019

description: L'articolo descrive le opere pittoriche presenti all'interno della chiesa di San Francesco a Staffolo, un gruppo di dipinti databili fra la seconda metà del ’500 e il ’700, quasi del tutto sconosciuti agli studi. Servendosi di vari metodi di analisi, dallo studio archivistico, a quello stilistico fino all'iconografia, si è cercato di arrivare alla loro attribuzione e contestualizzazione storica, che ha permesso di recuperare la storia di un interessante nucleo di opere, frutto della committenza locale, ma provenienti spesso da fuori regione e opera di artisti più o meno noti, come Filippo Bellini da Urbino, Maffeo Verona, Francesco Trevisani e Giovanni Maspani.
The article describes the pictorial works inside the St. Francis’s church in Staffolo, a group of paintings datable between the second half of the XVI and the XVIII century, mostly unknown to the studies. Using different methods of analysis, from the archival study, to the stylistic method until the iconography,  it has been tried to get their attribution and historic context, which permitted to recover the history of an interesting group of works of art, product of the local purchasers, but often coming outside the region and made by more or less known artists, like Filippo Bellini from Urbino, Maffeo Verona, Francesco Trevisani and Giovanni Maspani.
description: IL CAPITALE CULTURALE. Studies on the Value of Cultural Heritage, N° 19 (2019): The management of cultural heritage and landscape in inner areas
Finite-size correction and bulk hole-excitations for special case of an open XXZ chain with nondiagonal boundary terms at roots of unity
Creators: name: Murgan, Rajan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using our solution for the open spin-1/2 XXZ quantum spin chain with N spins and two arbitrary boundary parameters at roots of unity, the central charge and the conformal dimensions for bulk hole excitations are derived from the 1/N correction to the energy (Casimir energy).
description: 21 pages, LaTeX, v2: minor changes and 3 references added
Considerazioni sull’avvenire della montagna meridionale / Thoughts on the future of the southern mountains
Creators: name: Rossi Doria, Manlio
Publisher: name: eum
Year: 2019

description: Manlio Rossi Doria, Considerazioni sull’avvenire della montagna meridionale / Thoughts on the future of the southern mountains, «la Bonifica», numero speciale “La montagna tra povertà e sviluppo”, Roma, XXII, n. 11-12, novembre-dicembre 1968, pp. 885-889.

Translation by Kosmos Traduzioni, Reggio Emilia.
description: Il Capitale culturale. Studies on the value of cultural heritage, N° 19 (2019): The management of cultural heritage and landscape in inner areas
The Bright and the Dark Side of Malin 1
Creators: name: Sancisi, Renzo
name: Fraternali, Filippo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Malin 1 has long been considered a prototype giant, dark matter dominated Low Surface Brightness galaxy. Two recent studies, one based on a re-analysis of VLA HI observations and the other on an archival Hubble I-band image, throw a new light on this enigmatic galaxy and on its dark/luminous matter properties.
description: 4 pages, 3 figures, to appear in the Proceedings of the 41st ESLAB Symposium "The Impact of HST on European Astronomy", 29 May to 1 June 2007, ESTEC, Noordwijk, NL
Text+ Participation Roadmap
Creators: name: Friedrichs, Sonja
name: Trippel, Thorsten
name: Weimer, Lukas
Publisher: name: Zenodo
Year: 2022
Subjects: Community Involvement
Cooperation
Workshops
Research Data Management
Research Infrastructure

description: Text+ Participation Roadmap Die Einbeziehung der Community in den Aufbau einer sprach- und textbasierten Forschungsdateninfrastruktur Die 1. Text+ Frühjahrstagung brachte am 2. März 2022 interessierte Forschende und Text+ Beteiligte virtuell zusammen. Anhand der vorgestellten Participation Roadmap wurden die Wege der Zusammenarbeit von Konsortium und Community diskutiert. Inhalt:
 Bedarfe und Ideen von Nutzenden
 Kooperationen
 Workshops und Summer Schools
 Integration von Angeboten
 Forschungsdatenmanagement
 Text+ ist ein Konsortium der bundesweiten Initiative zum Aufbau einer nationalen Forschungsdateninfrastruktur (NFDI) und wird gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 460033370.
Infrared Optical Properties of Ferropericlase (Mg1-xFexO): Experiment and Theory
Creators: name: Sun, Tao
name: Allen, Philip B.
name: Stahnke, David G.
name: Jacobsen, Steven D.
name: Homes, Christopher C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The temperature dependence of the reflectance spectra of magnesium oxide (MgO) and ferropericlase (Mg1-xFexO, for x=0.06 and x=0.27) have been measured over a wide frequency range (~50 to 32000 cm-1) at 295 and 6 K. The complex dielectric function has been determined from a Kramers-Kronig analysis of the reflectance. The spectra of the doped materials resembles pure MgO in the infrared region, but with much broader resonances. We use a shell model to calculate the dielectric function of ferropericlase, including both anharmonic phonon-phonon interactions and disorder scattering. These data are relevant to understanding the heat conductivity of ferropericlase in the earth's lower mantle.
description: 17 pages, 6 figures