cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
iVINE - Ionization in the parallel tree/SPH code VINE: First results on the observed age-spread around O-stars
Creators: name: Gritschneder, M.
name: Naab, T.
name: Burkert, A.
name: Walch, S.
name: Heitsch, F.
name: Wetzstein, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a three-dimensional, fully parallelized, efficient implementation of ionizing UV radiation for smoothed particle hydrodynamics (SPH) including self-gravity. Our method is based on the SPH/tree code VINE. We therefore call it iVINE (for Ionization + VINE). This approach allows detailed high-resolution studies of the effects of ionizing radiation from e.g. young massive stars on their turbulent parental molecular clouds. In this paper we describe the concept and the numerical implementation of the radiative transfer for a plain-parallel geometry and we discuss several test cases demonstrating the efficiency and accuracy of the new method. As a first application, we study the radiatively driven implosion of marginally stable molecular clouds at various distances of a strong UV source and show that they are driven into gravitational collapse. The resulting cores are very compact and dense exactly as it is observed in clustered environments. Our simulations indicate that the time of triggered collapse depends on the distance of the core from the UV source. Clouds closer to the source collapse several $10^5$ years earlier than more distant clouds. This effect can explain the observed age spread in OB associations where stars closer to the source are found to be younger. We discuss possible uncertainties in the observational derivation of shock front velocities due to early stripping of proto-stellar envelopes by ionizing radiation.
description: 12 pages, 8 figures, accepted by MNRAS
Qubit-induced phonon blockade as a signature of quantum behavior in nanomechanical resonators
Creators: name: Liu, Yu-xi
name: Miranowicz, Adam
name: Gao, Y. B.
name: Bajer, J.
name: Sun, C. P.
name: Nori, Franco
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The observation of quantized nanomechanical oscillations by detecting femtometer-scale displacements is a significant challenge for experimentalists. We propose that phonon blockade can serve as a signature of quantum behavior in nanomechanical resonators. In analogy to photon blockade and Coulomb blockade for electrons, the main idea for phonon blockade is that the second phonon cannot be excited when there is one phonon in the nonlinear oscillator. To realize phonon blockade, a superconducting quantum two-level system is coupled to the nanomechanical resonator and is used to induce the phonon self-interaction. Using Monte Carlo simulations, the dynamics of the induced nonlinear oscillator is studied via the Cahill-Glauber $s$-parametrized quasiprobability distributions. We show how the oscillation of the resonator can occur in the quantum regime and demonstrate how the phonon blockade can be observed with currently accessible experimental parameters.
The Aquarius Project: the subhalos of galactic halos
Creators: name: Springel, Volker
name: Wang, Jie
name: Vogelsberger, Mark
name: Ludlow, Aaron
name: Jenkins, Adrian
name: Helmi, Amina
name: Navarro, Julio F.
name: Frenk, Carlos S.
name: White, Simon D. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have performed the largest ever particle simulation of a Milky Way-sized dark matter halo, and present the most comprehensive convergence study for an individual dark matter halo carried out thus far. We have also simulated a sample of 6 ultra-highly resolved Milky-way sized halos, allowing us to estimate the halo-to-halo scatter in substructure statistics. In our largest simulation, we resolve nearly 300,000 gravitationally bound subhalos within the virialized region of the halo. Simulations of the same object differing in mass resolution by factors up to 1800 accurately reproduce the largest subhalos with the same mass, maximum circular velocity and position, and yield good convergence for the abundance and internal properties of dark matter substructures. We detect up to four generations of subhalos within subhalos, but contrary to recent claims, we find less substructure in subhalos than in the main halo when regions of equal mean overdensity are compared. The overall substructure mass fraction is much lower in subhalos than in the main halo. Extrapolating the main halo's subhalo mass spectrum down to an Earth mass, we predict the mass fraction in substructure to be well below 3% within 100 kpc, and to be below 0.1% within the Solar Circle. The inner density profiles of subhalos show no sign of converging to a fixed asymptotic slope and are well fit by gently curving profiles of Einasto form. The mean concentrations of isolated halos are accurately described by the fitting formula of Neto et al. down to maximum circular velocities of 1.5 km/s, an extrapolation over some 5 orders of magnitude in mass. However, at equal maximum circular velocity, subhalos are more concentrated than field halos, with a characteristic density that is typically ~2.6 times larger and increases towards the halo centre.
description: Submitted to MNRAS on 08/08/2008, 30 pages, 29 figures. Full resolution version, images, and videos available at http://www.mpa-garching.mpg.de/aquarius
Canonical Coordinates and Principal Directions for Surfaces in $\H^2\times\R$
Creators: name: Dillen, Franki
name: Munteanu, Marian Ioan
name: Nistor, Ana Irina
Publisher: name: arXiv
Year: 2009
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53B25

description: In this paper we characterize and classify surfaces in ${\mathbb{H}}^2\times{\mathbb{R}}$ which have a canonical principal direction. Here ${\mathbb{H}}^2$ denotes the hyperbolic plane. We study some geometric properties such as minimality and flatness. Some examples are given to complete the study.
description: 25 Latex pages, to appear in Taiwanese Mathematical Journal
Upper bounds on the performance of differential-phase-shift quantum key distribution
Creators: name: Gomez-Sousa, Hipolito
name: Curty, Marcos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we investigate limitations imposed by sequential attacks on the performance of a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. Specifically, we analyze a sequential attack based on optimal unambiguous discrimination of the relative phases between consecutive signal states emitted by the source. We show that this attack can provide tighter upper bounds for the security of a DPS QKD scheme than those derived from sequential attacks where the eavesdropper aims to identify the state of each signal emitted by the source unambiguously.
description: 11 pages, 6 figures
Late Ordovician geographic patterns of extinction compared with simulations of astrophysical ionizing radiation damage
Creators: name: Melott, Adrian L.
name: Thomas, Brian C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Biological Physics (physics.bio-ph)
subject: Geophysics (physics.geo-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Based on the intensity and rates of various kinds of intense ionizing radiation events such as supernovae and gamma-ray bursts, it is likely that the Earth has been subjected to one or extinction level events during the Phanerozoic. These induce changes in atmospheric chemistry so that the level of Solar ultraviolet-B radiation reaching the surface and near-surface waters may be doubled for up to a decade. This UVB level is known from experiment to be more than enough to kill off many kinds of organisms, particularly phytoplankton. It could easily induce a crash of the photosynthetic-based food chain in the oceans. Regularities in the latitudinal distribution of damage are apparent in simulations of the atmospheric changes. We previously proposed that the late Ordovician extinction is a plausible candidate for a contribution from an ionizing radiation event, based on environmental selectivity in trilobites. To test a null hypothesis based on this proposal, we confront latitudinal differential extinction rates predicted from the simulations with data from a published analysis of latitudinal gradients in the Ordovician extinction. The pattern of UVB damage always shows a strong maximum at some latitude, with substantially lower intensity to the north and south of this maximum. We find that the pattern of damage predicted from our simulations is consistent with the data assuming a burst approximately over the South Pole, and no further north than -75 degrees. We predict that any land mass (such as parts of north China, Laurentia, and New Guinea) which then lay north of the equator should be a refuge from UVB effects, and show a different pattern of extinction in the first strike of the end-Ordovician extinction, if induced by such a radiation event.
description: Accepted for publication in Paleobiology. 16 pages, 2 figures
Summation formula over the zeros of the associated Legendre function with a physical application
Creators: name: Saharian, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 81T20; 83C47; 33E30

description: Associated Legendre functions arise in many problems of mathematical physics. By using the generalized Abel-Plana formula, in this paper we derive a summation formula for the series over the zeros of the associated Legendre function of the first kind with respect to the degree. The summation formula for the series over the zeros of the Bessel function, previously discussed in the literature, is obtained as a limiting case. The Wightman function for a scalar field with general curvature coupling parameter is considered inside a spherical boundary on background of constant negative curvature space. The corresponding mode sum contains series over the zeros of the associated Legendre function. The application of the summation formula allows us to present the Wightman function in the form of the sum of two integrals. The first one corresponds to the Wightman function for the bulk geometry without boundaries and the second one is induced by the presence of the spherical shell. For points away from the boundary the latter is finite in the coincidence limit. In this way the renormalization of the vacuum expectation value of the field squared is reduced to that for the boundary-free part.
description: 18 pages
Low-frequency excitation of double quantum dots
Creators: name: Kashcheyevs, Vyacheslavs
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We address theoretically adiabatic regime of charge transport for a model of two tunnel-coupled quantum dots connected in series. The energy levels of the two dots are harmonically modulated by an external potential with a constant phase shift between the two. Motivated by recent experiments with surface-acoustic-wave excitation, we consider two situations: (a) pure pumping in the absence of external voltage (also at finite temperature), and (b) adiabatic modulation of the current driven by large external bias. In both cases we derive results consistent with published experimental data. For the case (b) we explicitly derive the adiabatic limit of Tien-Gordon formula for photon-assisted tunneling and compare it to the outcome of simple conductance modulation. A tutorial for adiabatic pumping current calculations with the Green function formalism is included.
description: 9 pages, 5 figs, invited paper for AOMD-6, to appear in SPIE Proceedings
Generating a Fractal Butterfly Floquet Spectrum in a Class of Driven SU(2) Systems: Eigenstate Statistics
Creators: name: Bandyopadhyay, Jayendra N.
name: Wang, Jiao
name: Gong, Jiangbin
Publisher: name: arXiv
Year: 2009
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Floquet spectra of a class of driven SU(2) systems have been shown to display butterfly patterns with multifractal properties. The implication of such critical spectral behavior for the Floquet eigenstate statistics is studied in this work. Following the methodologies for understanding the fractal behavior of energy eigenstates of time-independent systems on the Anderson transition point, we analyze the distribution profile, the mean value, and the variance of the logarithm of the inverse participation ratio of the Floquet eigenstates associated with multifractal Floquet spectra. The results show that the Floquet eigenstates also display fractal behavior, but with features markedly different from those in time-independent Anderson-transition models. This motivated us to propose a new type of random unitary matrix ensemble, called "power-law random banded unitary matrix" ensemble, to illuminate the Floquet eigenstate statistics of critical driven systems. The results based on the proposed random matrix model are consistent with those obtained from our dynamical examples with or without time-reversal symmetry.
description: 10 pages, 8 figures, published version
Additional file 1 of Land use and life history constrain adaptive genetic variation and reduce the capacity for climate change adaptation in turtles
Creators: name: Byer, Nathan W.
name: Fountain, Emily D.
name: Reid, Brendan N.
name: Miller, Kristen
name: Kulzer, Paige J.
name: Peery, M. Zachariah
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology

description: Additional file 1.
The dynamical structure of dark matter halos with universal properties
Creators: name: Van Hese, Emmanuel
name: Baes, Maarten
name: Dejonghe, Herwig
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: $N$-body simulations have unveiled several apparently universal properties of dark matter halos, including a cusped density profile, a power-law pseudo phase-space density $ρ/σ_r^3$, and a linear $β-γ$ relation between the density slope and the velocity anisotropy. We present a family of self-consistent phase-space distribution functions $F(E,L)$, based on the Dehnen-McLaughlin Jeans models, that incorporate these universal properties very accurately. These distribution functions, derived using a quadratic programming technique, are analytical, positive and smooth over the entire phase space and are able to generate four-parameter velocity anisotropy profiles $β(r)$ with arbitrary asymptotic values $β_0$ and $β_\infty$. We discuss the orbital structure of six radially anisotropic systems in detail and argue that, apart from its use for generating initial conditions for $N$-body studies, our dynamical modeling provides a valuable complementary approach to understand the processes involved in the formation of dark matter halos.
description: 12 pages, 5 figures, accepted for publication in ApJ
Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection
Creators: name: Garai, Z.
name: Pribulla, T.
name: Parviainen, H.
name: Pallé, E.
name: Claret, A.
name: Szigeti, L.
name: Béjar, V. J. S.
name: Casasayas-Barris, N.
name: Crouzet, N.
name: Fukui, A.
name: Chen, G.
name: Kawauchi, K.
name: Klagyivik, P.
name: Kurita, S.
name: Kusakabe, N.
name: de Leon, J. P.
name: Livingston, J. H.
name: Luque, R.
name: Mori, M.
name: Murgas, F.
name: Narita, N.
name: Nishiumi, T.
name: Oshagh, M.
name: Szabó, Gy. M.
name: Tamura, M.
name: Terada, Y.
name: Watanabe, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Up to now, WASP-12b is the only hot Jupiter confirmed to have a decaying orbit. The case of WASP-43b is still under debate. Recent studies preferred or ruled out the orbital decay scenario, but further precise transit timing observations are needed to definitively confirm or refute the period change of WASP-43b. This possibility is given by the Transiting Exoplanet Survey Satellite (TESS) space telescope. In this work we used the available TESS data, multi-color photometry data obtained with the Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets 2 (MuSCAT2) and literature data to calculate the period change rate of WASP-43b and to improve its precision, and to refine the parameters of the WASP-43 planetary system. Based on the observed-minus-calculated data of 129 mid-transit times in total, covering a time baseline of about 10 years, we obtained an improved period change rate of $\dot{P} = -0.6 \pm 1.2$ ms yr$^{-1}$ that is consistent with a constant period well within $1σ$. We conclude that new TESS and MuSCAT2 observations confirm no detection of WASP-43b orbital decay.
description: 10 pages, 6 figures, accepted for publication in MNRAS
Unified BRST description of AdS gauge fields
Creators: name: Alkalaev, K. B.
name: Grigoriev, M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A concise formulation for mixed-symmetry gauge fields on AdS space is proposed. It is explicitly local, gauge invariant, and has manifest AdS symmetry. Various other known formulations (including the original formulation of Metsaev and the unfolded formulation) can be derived through the appropriate reductions and gauge fixing. As a byproduct, we also identify some new useful formulations of the theory that can be interesting for further developments. The formulation is presented in the BRST terms and extensively uses Howe duality. In particular, the BRST operator is a sum of the term associated to the spacetime isometry algebra and the term associated to the Howe dual symplectic algebra.
description: v3 (journal version): 29 pages, some technical details added as a new appendix, minor corrections, references added
Nucleation of quark matter in protoneutron star matter
Creators: name: Mintz, B. W.
name: Fraga, E. S.
name: Pagliara, G.
name: Schaffner-Bielich, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The phase transition from hadronic to quark matter may take place already during the early post-bounce stage of core collapse supernovae when matter is still hot and lepton rich. If the phase transition is of first order and exhibits a barrier, the formation of the new phase occurs via the nucleation of droplets. We investigate the thermal nucleation of a quark phase in supernova matter and calculate its rate for a wide range of physical parameters. We show that the formation of the first droplet of a quark phase might be very fast and therefore the phase transition to quark matter could play an important role in the mechanism and dynamics of supernova explosions.
description: v3: fits version published in Physical Review D
Comparative morphology of selected aspects of the alimentary system of three species of limpets, Collisella pelta (Rathke), C. persona (Rathke) and C. scutum (Rathke)
Creators: name: Latta, Lesley
Publisher: name: University of British Columbia
Year: 2010

description: The morphology of the alimentary system was investigated in three species of Collisella, (C. pelta, C. persona, and C. scutum). The radular teeth were studied using the scanning electron microscope. The teeth of the above three species could be distinguished by the anterior curvature, anteroposterior and/or lateralinclination, sharpness of the tips, and presence or absence of uncini. Wear patterns of the radular teeth were similar in the three species. The radular basal plates could be differentiated by the anterior lobe, shape of the posterior margin, outline of the overlapping plates, and spacing of plates along the radular ribbon. Length and looping of the radular sheath was investigated. In C. persona the radular length (relative to body size) was greatest and the looping the most complex. In C. pelta the the radula was short and looping simple. C. scutum was intermediate in relative radular length and looping. Variation in radular looping was determined by a comparison of 60 individuals of each species from three different populations (20 of each species from three different localities). S.E.M. micrographs of the jaw showed that in C. pelta the anterior band bore a median tooth, and ventral grooving due to the radula was deep and distinct. In C. scutum the anterior band of the jaw was often irregular, and ventral grooving was faint. The jaws of C. persona had smooth anterior bands, and the ventral surface was unmarked. While looping of the intestine differed slightly among the three species, considerable individual variation and some species overlap was observed. Stomach diameter was larger in C. pelta than in the other two species. The placement of the proventriculus relative to the stomach and posterior esophagus differed in the three species. The salivary glands were much larger in C. pelta than in C. scutum and C. persona. Digestive gland tubules were acinous in C. pelta, but tubular in shape in C. scutum and C. persona. The histology of the gut epithelium and associated glands was studied using serial sections from 14 animals. No differences among the three species were found. Morphology of the above structures was considered with respect to the reported diet of each species. A correlation was found between radular tooth form and the species reported preference for either microscopic algae or macroscopic algae. The correlation was considered to be indicative of dietary adaptation. The morphology of the radular teeth and the other characters studied (basal plates, jaw, salivary glands) were discussed with respect to the adaptation of each species to its preferred algal diet. The characters investigated were considered with respect to their taxonomic value. They were ranked according to the degree of individual variation found, and ease of determination of the character.
Quasars Probing Quasars III: New Clues to Feedback, Quenching, and the Physics of Massive Galaxy Formation
Creators: name: Prochaska, J. Xavier
name: Hennawi, Joseph F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Galaxies hosting z~2 quasars are the high-$z$ progenitors of today's massive `red-and-dead' galaxies. With close pairs of quasars at different redshifts, a background quasar can be used to study a foreground quasar's halo gas in absorption, providing a wealth of information about feedback, quenching, and the physics of massive galaxy formation. We present a Keck/HIRES spectrum of the bright background quasar in a projected pair with angular separation 13.3" corresponding to 108kpc at the redshift of the foreground quasar z_fg=2.4360 +/- 0.0005, precisely determined from Gemini/GNIRS near-IR spectroscopy. Our echelle spectrum reveals optically thick gas (NHI~10^19.7), coincident with the foreground quasar redshift. The ionic transitions of associated metal-lines reveal the following properties of the foreground quasar's halo: (1) the kinematics are extreme with absorption extending to +780km/s relative to z_fg; (2) the metallicity is nearly solar; (3) the temperature of the predominantly ionized gas is T
description: Accepted to ApJ. 38 pages, 11 figures
Thermal Emission from Gamma-Ray Bursts
Creators: name: Pe'er, Asaf
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In recent years, there are increasing evidence for a thermal emission component that accompanies the overall non-thermal spectra of the prompt emission phase in GRBs. Both the temperature and flux of the thermal emission show a well defined temporal behavior, a broken power law in time. The temperature is nearly constant during the first few seconds, afterwards it decays with power law index alpha ~0.7. The thermal flux also decays at late times as a power law with index beta ~2.1. This behavior is very ubiquitous, and was observed in a sample currently containing 32 BATSE bursts. These results are naturally explained by considering emission from the photosphere. The photosphere of a relativistically expanding plasma wind strongly depends on the angle to the line of sight, theta. As a result, thermal emission can be seen after tens of seconds. By introducing probability density function P(r,theta) of a thermal photon to escape the plasma at radius r and angle theta, the late time behavior of the flux can be reproduced analytically. During the propagation below the photosphere, thermal photons lose energy as a result of the slight misalignment of the scattering electrons velocity vectors, which leads to photon comoving energy decay epsilon'(r)~r^{-2/3}. This in turn can explain the decay of the temperature observed at late times. Finally, I show that understanding the thermal emission is essential in understanding the high energy, non-thermal spectra. Moreover, thermal emission can be used to directly measure the Lorentz factor of the flow and the initial jet radius.
description: 6 pages; To appear in the proceedings of "2008 Nanjing GRB conference", Nanjing, China, June 2008
Evolution of stellar collision products in open clusters. I. Blue stragglers in N-body models of M67
Creators: name: Glebbeek, E.
name: Pols, O. R.
name: Hurley, J. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Stellar collisions are an important formation channel for blue straggler stars in globular and old open clusters. Hydrodynamical simulations have shown that the remnants of such collisions are out of thermal equilibrium, are not strongly mixed and can rotate very rapidly. Detailed evolution models of collision products are needed to interpret observed blue straggler populations and to use them to probe the dynamical history of a star cluster. We expand on previous studies by presenting an efficient procedure to import the results of detailed collision simulations into a fully implicit stellar evolution code. Our code is able to evolve stellar collision products in a fairly robust manner and allows for a systematic study of their evolution. Using our code we have constructed detailed models of the collisional blue stragglers produced in the $N$-body simulation of M67 performed by Hurley \emph{et al.} in 2005. We assume the collisions are head-on and thus ignore the effects of rotation in this paper. Our detailed models are more luminous than normal stars of the same mass and in the same stage of evolution, but cooler than homogeneously mixed versions of the collision products. The increased luminosity and inefficient mixing decrease the remaining main-sequence lifetimes of the collision products, which are much shorter than predicted by the simple prescription commonly used in $N$-body simulations.
description: To be published in A&A
6G Internet of Things: A Comprehensive Survey
Creators: name: Nguyen, Dinh C.
name: Ding, Ming
name: Pathirana, Pubudu N.
name: Seneviratne, Aruna
name: Li, Jun
name: Niyato, Dusit
name: Dobre, Octavia
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The sixth generation (6G) wireless communication networks are envisioned to revolutionize customer services and applications via the Internet of Things (IoT) towards a future of fully intelligent and autonomous systems. In this article, we explore the emerging opportunities brought by 6G technologies in IoT networks and applications, by conducting a holistic survey on the convergence of 6G and IoT. We first shed light on some of the most fundamental 6G technologies that are expected to empower future IoT networks, including edge intelligence, reconfigurable intelligent surfaces, space-air-ground-underwater communications, Terahertz communications, massive ultra-reliable and low-latency communications, and blockchain. Particularly, compared to the other related survey papers, we provide an in-depth discussion of the roles of 6G in a wide range of prospective IoT applications via five key domains, namely Healthcare Internet of Things, Vehicular Internet of Things and Autonomous Driving, Unmanned Aerial Vehicles, Satellite Internet of Things, and Industrial Internet of Things. Finally, we highlight interesting research challenges and point out potential directions to spur further research in this promising area.
description: Accepted at IEEE Internet of Things Journal, 25 pages
Maple Symbolic Computation in the Calculus of Variations
Creators: name: Louro, Andreia M. F.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optimization and Control (math.OC)
subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 49-01; 49-04; 49K05

description: It is the aim of this work to identify and illustrate the potential and weaknesses of the computer algebra system Maple in the area of the Calculus of Variations: a classical area of mathematics that studies the methods for finding maximum and minimum values of functionals of integral type. Variational problems are usually solved with the help of the necessary optimality conditions of Euler-Lagrange, which are, in general, nonlinear and difficult second order differential equations to be solved. We show how the computer algebra system Maple can be useful in the determination and resolution of these equations. We will also present the solution to the celebrated brachistochrone problem from the point of view of the calculus of variations and the Maple system, and a reformulation of the classical problem obtained by restricting the class of admissible functions.
description: manuscript in Portuguese
Lepton flavour violation in the MSSM
Creators: name: Girrbach, Jennifer
name: Mertens, Susanne
name: Nierste, Ulrich
name: Wiesenfeldt, Soren
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive new constraints on the quantities delta_{XY}^{ij}, X,Y=L,R, which parametrise the flavour-off-diagonal terms of the charged slepton mass matrix in the MSSM. Considering mass and anomalous magnetic moment of the electron we obtain the bound |delta^{13}_{LL} delta^{13}_{RR}|<0.1 for tan beta=50, which involves the poorly constrained element delta^{13}_{RR}. We improve the predictions for the decays tau -> mu gamma, tau -> e gamma and mu -> e gamma by including two-loop corrections which are enhanced if tan beta is large. The finite renormalisation of the PMNS matrix from soft SUSY-breaking terms is derived and applied to the charged-Higgs-lepton vertex. We find that the experimental bound on BR(tau -> e gamma) severely limits the size of the MSSM loop correction to the PMNS element U_{e3}, which is important for the proper interpretation of a future U_{e3} measurement. Subsequently we confront our new values for delta^{ij}_{LL} with a GUT analysis. Further, we include the effects of dimension-5 Yukawa terms, which are needed to fix the Yukawa unification of the first two generations. If universal supersymmetry breaking occurs above the GUT scale, we find the flavour structure of the dimension-5 Yukawa couplings tightly constrained by mu -> e gamma.
description: 37 pages, 15 figures; typo in Equation (35) and (49) corrected
Building a European Literary Bibliography
Creators: name: Malínek, Vojtěch
name: Vimr, Ondrej
Publisher: name: Zenodo
Year: 2025
Subjects: metadata-based research
arts, humanities and social sciences

description: This presentation was given during the workshop Metadata-based Research in Arts, Humanities and Social Sciences (March 4–5, 2025) organised by the DARIAH ERIC Bibliographical Data Working Group.
description: The Metadata-based Research in Arts, Humanities and Social Sciences workshop has been supported by DARIAH ERIC as part of the 2023–2025 Working Group funding round.
Evolution of stellar collision products in open clusters. II. A grid of low-mass collisions
Creators: name: Glebbeek, E.
name: Pols, O. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In a companion paper we studied the detailed evolution of stellar collision products that occurred in an $N$-body simulation of the old open cluster M67 and compared our detailed models to simple prescriptions. In this paper we extend this work by studying the evolution of the collision products in open clusters as a function of mass and age of the progenitor stars. We calculated a grid of head-on collisions covering the section of parameter space relevant for collisions in open clusters. We create detailed models of the merger remnants using an entropy-sorting algorithm and follow their subsequent evolution during the initial contraction phase, through the main sequence and up to the giant branch with our detailed stellar evolution code. We compare the location of our models in a colour-magnitude diagram to the observed blue straggler population of the old open clusters M67 and NGC 188 and find that they cover the observed blue straggler region of both clusters. For M67, collisions need to have taken place recently. Differences between the evolution tracks of the collision products and normal main sequence stars can be understood quantitatively using a simple analytic model. We present an analytic recipe that can be used in an $N$-body code to transform a precomputed evolution track for a normal star into an evolution track for a collision product.
description: To be published in A&A
Noise-assisted energy transfer in quantum networks and light-harvesting complexes
Creators: name: Chin, Alex W.
name: Datta, Animesh
name: Caruso, Filippo
name: Huelga, Susana F.
name: Plenio, Martin B.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We provide physically intuitive mechanisms for the effect of noise on excitation energy transfer (EET) in networks. Using these mechanisms of dephasing-assisted transport (DAT) in a hybrid basis of both excitons and sites, we develop a detailed picture of how noise enables energy transfer with efficiencies well above $90%$ across the Fenna-Matthew-Olson (FMO) complex, a type of light harvesting molecule. We demonstrate explicitly how noise alters the pathways of energy transfer across the complex, suppressing ineffective pathways and facilitating direct ones to the reaction centre. We explain that the fundamental mechanisms underpinning DAT are expected to be robust with respect to the considered noise model but show that the specific details of the exciton-phonon coupling, which remain largely unknown in these type of complexes, and in particular the impact of non-Markovian effects, results in variations of dynamical features that should be amenable to experimental verification within current or planned technology. A detailed understanding of DAT in natural compounds should open up a new paradigm of `noise-engineering' by which EET can be optimized in artificial light-harvesting structures.
description: Version published in NJP. Contains a comprehensive new section on non-markovian dynamics and also efficient FMO transport induced by local low frequency vibrations
Chandra's View of the Ram Pressure Stripped Galaxy M86
Creators: name: Randall, S.
name: Nulsen, P.
name: Forman, W. R.
name: Jones, C.
name: Machacek, M.
name: Murray, S. S.
name: Maughan, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from a mosaic of nine Chandra observations of M86 and the surrounding field. We detect three main diffuse components: the Virgo ICM at ~2.4 keV, the extended halo of M86 at ~1.2 keV, and the cooler central and stripped gas of M86 at ~0.8 keV. The most striking feature is a long tail of emission, which consists of a plume ~ 4' north of M86 and two main extensions emanating from the plume. Based on the morphology and temperature structure of the tail, we conclude that it is formed by ram pressure stripping of M86 as it falls into the Virgo cluster and interacts with the Virgo ICM, in agreement with earlier work. The tail is 150 kpc in projection, and a simple estimate gives a lower limit on the true length of the tail of 380 kpc, making this the longest ram pressure stripped tail presently known. The total gas mass in the plume (7x10^8 M_sun) and tail (1x10^9 M_sun) is about three times that in the core of M86, which supports the scenario where most of the gas was stripped rapidly and recently. The projected position of the plume can be understood if M86 has an aspherical potential, as suggested by optical isophotes. Ram pressure stripping from an aspherical potential can also explain the split "double tails" seen in M86 and in other Virgo cluster galaxies in the field. The large line-of-sight velocity of M86 (1550 km/s with respect to M87), its position relative to the Virgo cluster, and the orientation of the tail tightly constrain its orbital parameters. The data are inconsistent with a radial orbit, and imply inner and outer turning radii of r_i ~ 300 kpc and r_o > 8.8 Mpc, indicating that M86 is, at best, only weakly bound to the Virgo cluster.
description: 24 pages, 15 figures, submitted to ApJ. Version with high-resolution figures available at http://hea-www.harvard.edu/~srandall/M86/
Traversable wormholes: Some simple examples
Creators: name: Visser, Matt
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Building on the work of Morris, Thorne, and Yurtsever, some particularly simple examples of traversable wormholes are exhibited. These examples are notable both because the analysis is not limited to spherically symmetric cases, and because it is possible to in some sense minimize the use of exotic matter. In particular, it is possible for a traveller to traverse such a wormhole without passing through a region of exotic matter. As in previous analyses, the weak energy condition is violated in these traversable wormholes.
description: Pre-arXiv article from 1989; 7 pages, no figures. (Uploaded to arXiv to help researchers with limited library facilities.)
Measurement of J/psi photoproduction at large momentum transfer at HERA
Creators: name: ZEUS Collaboration
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The proton-dissociative diffractive photoproduction of J/psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb^-1. The cross section is presented as a function of the photon-proton centre-of-mass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations.
description: 38 pages, 11 figures. In figures 6,9 and 11 added H1 measurement. Added comment on background contribution in subsection Evaluation of background
Noncommutative Dunkl operators and braided Cherednik algebras
Creators: name: Bazlov, Yuri
name: Berenstein, Arkady
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20G42; 16S80, 20F55

description: We introduce braided Dunkl operators that are acting on a q-polynomial algebra and q-commute. Generalizing the approach of Etingof and Ginzburg, we explain the q-commutation phenomenon by constructing braided Cherednik algebras for which the above operators form a representation. We classify all braided Cherednik algebras using the theory of braided doubles developed in our previous paper. Besides ordinary rational Cherednik algebras, our classification gives new algebras attached to an infinite family of subgroups of even elements in complex reflection groups, so that the corresponding braided Dunkl operators pairwise anti-commute. We explicitly compute these new operators in terms of braided partial derivatives and divided differences.
description: 48 pages, no figures. References to papers by T. Khongsap, W. Wang are added. An anti-commutatator version is included (Corollary 3.7)
Reduced Complexity Demodulation and Equalization Scheme for Differential Impulse Radio UWB Systems with ISI
Creators: name: Ma, Xudong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we consider the demodulation and equalization problem of differential Impulse Radio (IR) Ultra-WideBand (UWB) Systems with Inter-Symbol-Interference (ISI). The differential IR UWB systems have been extensively discussed recently. The advantage of differential IR UWB systems include simple receiver frontend structure. One challenge in the demodulation and equalization of such systems with ISI is that the systems have a rather complex model. The input and output signals of the systems follow a second-order Volterra model. Furthermore, the noise at the output is data dependent. In this paper, we propose a reduced-complexity joint demodulation and equalization algorithm. The algorithm is based on reformulating the nearest neighborhood decoding problem into a mixed quadratic programming and utilizing a semi-definite relaxation. The numerical results show that the proposed demodulation and equalization algorithm has low computational complexity, and at the same time, has almost the same error probability performance compared with the maximal likelihood decoding algorithm.
description: Camera ready version. Several typos in the previous version have been fixed
What Drives and Sustains Self-Assignment in Agile Teams
Creators: name: Masood, Zainab
name: Hoda, Rashina
name: Blincoe, Kelly
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Self-assignment, where software developers choose their own tasks, is a common practice in agile teams. However, it is not known why developers select certain tasks. It is important for managers to be aware of these reasons to ensure sustainable self-assignment practices. We investigated developers' preferences while they are choosing tasks for themselves. We collected data from 42 participants working in 25 different software companies. We applied Grounded Theory procedures to study and analyse factors for self-assigning tasks, which we grouped into three categories: task-based, developer-based, and opinion-based. We found that developers have individual preferences and not all factors are important to every developer. Managers share some common and varying perspectives around the identified factors. Most managers want developers to give higher priority to certain factors. Developers often need to balance between task priority and their own individual preferences, and managers facilitate this through a variety of strategies. More risk-averse managers encourage expertise-based self-assignment to ensure tasks are completed quickly. Managers who are risk-balancing encourage developers to choose tasks that provide learning opportunities only when there is little risk of delays or reduced quality. Finally, growth-seeking managers regularly encourage team members to pick tasks outside their comfort zone to encourage growth opportunities. Our findings will help managers to understand what developers consider when self-assigning tasks and help them empower their teams to practice self-assignment in a sustainable manner.
Rotational and Reflectional Equivariant Convolutional Neural Network for data-limited applications: Multiphase Flow demonstration
Creators: name: Siddani, Bhargav Sriram
name: Balachandar, S.
name: Fang, Ruogu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: This article deals with approximating steady-state particle-resolved fluid flow around a fixed particle of interest under the influence of randomly distributed stationary particles in a dispersed multiphase setup using Convolutional Neural Network (CNN). The considered problem involves rotational symmetry about the mean velocity (streamwise) direction. Thus, this work enforces this symmetry using $\mathbf{\textbf{SE(3)-equivariant}}$, special Euclidean group of dimension 3, CNN architecture, which is translation and three-dimensional rotation equivariant. This study mainly explores the generalization capabilities and benefits of SE(3)-equivariant network. Accurate synthetic flow fields for Reynolds number and particle volume fraction combinations spanning over a range of [86.22, 172.96] and [0.11, 0.45] respectively are produced with careful application of symmetry-aware data-driven approach.
description: Main change: The acronym CNN in title of previous version has been changed to Convolutional Neural Network
title: Survival of adults and larvae of grain beetles at lethal low temperature
Creators: name: Eliopoulos, P. A.
name: Prasodimou, G. Z.
name: Pouliou, A. V.
Publisher: name: Julius Kühn-Institut
Year: 2010
Subjects: subject: Tribolium confusum
subject: Oryzaephilus surinamensis
subject: Trogoderma granarium
subject: survival
subject: low temperature

description: Julius-Kühn-Archiv; 425; 637
High-fidelity reconstruction of turbulent flow from spatially limited data using enhanced super-resolution generative adversarial network
Creators: name: Yousif, Mustafa Z.
name: Yu, Linqi
name: Lim, HeeChang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In this study, a deep learning-based approach is applied with the aim of reconstructing high-resolution turbulent flow fields using minimal flow fields data. A multi-scale enhanced super-resolution generative adversarial network with a physics-based loss function is introduced as a model to reconstruct the high-resolution flow fields. The model capability to reconstruct high-resolution laminar flows is examined using data of laminar flow around a square cylinder. The results reveal that the model can accurately reproduce the high-resolution flow fields even when limited spatial information is provided. The case of turbulent channel flow is used to assess the ability of the model to reconstruct the high-resolution wall-bounded turbulent flow fields. The instantaneous and statistical results obtained from the model agree well with the ground truth data, indicating that the model can successfully learn to map the coarse flow fields to the high-resolution once. Furthermore, the computational cost of the proposed model, which is examined carefully, is found to be effectively low. This demonstrates that using high-fidelity training data with physics-guided generative adversarial network-based models can be practically efficient in reconstructing high-resolution turbulent flow fields from extremely coarse data.
description: Under consideration for publication in Physics of Fluids (23 pages, 12 figures)