cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Real-Time Dedispersion for Fast Radio Transient Surveys, using Auto Tuning on Many-Core Accelerators
Creators: name: Sclocco, Alessio
name: van Leeuwen, Joeri
name: Bal, Henri E.
name: van Nieuwpoort, Rob V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Dedispersion, the removal of deleterious smearing of impulsive signals by the interstellar matter, is one of the most intensive processing steps in any radio survey for pulsars and fast transients. We here present a study of the parallelization of this algorithm on many-core accelerators, including GPUs from AMD and NVIDIA, and the Intel Xeon Phi. We find that dedispersion is inherently memory-bound. Even in a perfect scenario, hardware limitations keep the arithmetic intensity low, thus limiting performance. We next exploit auto-tuning to adapt dedispersion to different accelerators, observations, and even telescopes. We demonstrate that the optimal settings differ between observational setups, and that auto-tuning significantly improves performance. This impacts time-domain surveys from Apertif to SKA.
description: 8 pages, accepted for publication in Astronomy and Computing
Saturation of the magnetorotational instability in the unstratified shearing box with zero net flux: convergence in taller boxes
Creators: name: Shi, Ji-Ming
name: Stone, James M.
name: Huang, Chelsea X.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Previous studies of the nonlinear regime of the magnetorotational instability in one particular type of shearing box model -- unstratified with no net magnetic flux -- find that without explicit dissipation (viscosity and resistivity) the saturation amplitude decreases with increasing numerical resolution. We show that this result is strongly dependent on the vertical aspect ratio of the computational domain $L_z/L_x$. When $L_z/L_x\lesssim 1$, we recover previous results. However, when the vertical domain is extended $L_z/L_x \gtrsim 2.5$, we find the saturation level of the stress is greatly increased (giving a ratio of stress to pressure $α\gtrsim 0.1$), and moreover the results are independent of numerical resolution. Consistent with previous results, we find that saturation of the MRI in this regime is controlled by a cyclic dynamo which generates patches of strong toroidal field that switches sign on scales of $L_x$ in the vertical direction. We speculate that when $L_z/L_x\lesssim 1$, the dynamo is inhibited by the small size of the vertical domain, leading to the puzzling dependence of saturation amplitude on resolution. We show that previous toy models developed to explain the MRI dynamo are consistent with our results, and that the cyclic pattern of toroidal fields observed in stratified shearing box simulations (leading to the so-called butterfly diagram) may also be related. In tall boxes the saturation amplitude is insensitive to whether or not explicit dissipation is included in the calculations, at least for large magnetic Reynolds and Prandtl number. Finally, we show MRI turbulence in tall domains has a smaller critical $\rm{Pm}_c$, and an extended lifetime compared to $L_z/L_x\lesssim 1$ boxes.
description: MNRAS in press; paper with higher resolution figures can be found at http://www.astro.princeton.edu/~jmshi/tallbox/ms_tallbox.pdf
AQUARIUS Data Management Plan
Creators: name: Schaap, Dick
name: Le, Hong Minh
name: Iona, Sissy
name: Diez, Susana
name: Partescano, Elena
name: Sagen, Helge
name: Buga, Luminita
name: Schepers, Lennert
name: Hedblom, Mikael
name: O'Grady, Eoin
name: Van Iseghem, Sylvie
name: Krijger, Tjerk
name: Giorgetti, Alessandra
Publisher: name: Zenodo
Year: 2024
Subjects: Data Management Plan

description: This document outlines the overall AQUARIUS Data Management Plan (DMP) and describes the planned Data Management approach to handle all Data arising from  Transnational Access projects funded by the AQUARIUS project.
Gamma Ray Burst reverse shock emission in early radio afterglows
Creators: name: Resmi, Lekshmi
name: Zhang, Bing
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Reverse shock (RS) emission from Gamma Ray Bursts is an important tool in investigating the nature of the ejecta from the central engine. If the ejecta magnetization is not high enough to suppress the RS, a strong RS emission component, usually peaking in the optical/IR band early on, would give important contribution to early afterglow light curves. In the radio band, synchrotron self-absorption may suppress early RS emission, and also delay the RS peak time. In this paper, we calculate the self-absorbed RS emission in the radio band for different dynamical conditions. In particular, we stress that the RS radio emission is subject to self-absorption in both reverse and forward shocks. We calculate the ratio between the reverse to forward shock flux at the RS peak time for different frequencies, which is a measure of the detectability of the RS emission component. We then constrain the range of physical parameters for a detectable RS, in particular the role of magnetization. We notice that unlike optical RS emission which is enhanced by moderate magnetization, a moderately magnetized ejecta does not necessarily produce a brighter radio RS due to the self-absorption effect. For typical parameters, the RS emission component would not be detectable below 1 GHz unless the medium density is very low (e.g. $n < 10^{-3} ~{\rm cm^{-3}}$ for ISM and $A_* < 5\times 10^{-4}$ for wind). These predictions can be tested with the afterglow observations with current and upcoming radio facilities such as JVLA, LOFAR, FAST, and SKA.
description: ApJ in press
Equivalence between direct and indirect effects with different sets of intermediate variables and covariates
Creators: name: Kuroki, Manabu
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: This paper deals with the concept of equivalence between direct and indirect effects of a treatment on a response using two sets of intermediate variables and covariates. First, we provide criteria for testing whether two sets of variables can estimate the same direct and indirect effects. Next, based on the proposed criteria, we discuss the variable selection problem from the viewpoint of estimation accuracy of direct and indirect effects, and show that selecting a set of variables that has a direct effect on a response cannot always improve estimation accuracy, which is contrary to the situation found in linear regression models. These results enable us to judge whether different sets of variables can yield the same direct and indirect effects and thus help us select appropriate variables to estimate direct and indirect effects with cost reduction or estimation accuracy.
description: Published at http://dx.doi.org/10.3150/14-BEJ664 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Into the Future
Creators: name: Sierman, Barbara
Publisher: name: Zenodo
Year: 2024

description: In 2024 the digital preservation community can look back with pride on what we have achieved. However, new challenges appear on the horizon, often originating from areas beyond our profession. We may no longer be able to conquer these within the existing preservation community, like we are used to do. Three decades ago, in 1998, a group of 60 people gathered in Hotel dos Templarios in Tomar, Portugal. They arrived from around 20 countries to participate in the first international workshop on digital preservation in Europe. The air was filled with eagerness and enthusiasm. Everyone felt part of a new and adventurous journey: how to preserve electronic (aka digital) heritage, the human record.This DELOS 6th workshop on Preservation was organized by two (!) projects funded by the European Commission: DELOS, consisting of computer scientists and NEDLIB, a project of national libraries. Two different worlds coming together in one place.The Tomar workshop started with a film “Into the Future. On the preservation of knowledge”. An initiative of CLIR, still available on Vimeo. The film aimed to raise awareness, amongst the general public and policy makers, of the risk of losing digital information. In just 50 minutes, broadcast via television, it conveyed the necessity of digital preservation.The 15 presenters at the workshop spoke on a range of topics, seemingly inspired by the 1996 report of Garrett and Waters “Preserving digital information”. Since then, the digital preservation community has made tremendous progress. Over time, the heritage organisations involved were able to translate the problems into workable solutions. Individual initiatives were connected in collaborative projects, initiated and funded by heritage organisations themselves with the support of the European Commission, the National Science Foundation and various governments. The profession of digital preservation shaped itself. We have built a solid house of digital preservation. 

 Change is afoot, as the discipline is challenged by growth, critical reflection on what's been built so far, its image of being an "elite" and highly specialized discipline. Developments like artificial intelligence and the effects of climate change will make it necessary to explain our principles and practices and to cooperate with other disciplines. Are the current DP practices sustainable enough to cope with these developments? Or is it time to renovate the house we have built?
Mean velocity equation for fluctuating flow: Numerical evaluation for small Reynolds numbers
Creators: name: Piest, Juergen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The mean veloctiy equation for fluctuating flow derived in an earlier paper of the author has been applied to circular jet flow for low Reynolds numbers. Numerical solutions have been obtained from an iteration starting with the corresponding solution of the Navier-Stokes equation. Deviations become distinct for Re > 30.
description: 18 pages, 10 figures
On the excursions of drifted Brownian motion and the successive passage times of Brownian motion
Creators: name: Abundo, Mario
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J60, 60H05, 60H10

description: By using the law of the excursions of Brownian motion with drift, we find the distribution of the $n-$th passage time of Brownian motion through a straight line $S(t)= a + bt.$ In the special case when $b = 0,$ we extend the result to a space-time transformation of Brownian motion.
description: 4 figures, accepted for publication in Physica A
Nonlinear Absorption of Radio Waves in a Noncollinear Antiferromagnet
Creators: name: Tikhonov, Aleksey M.
name: Pavlov, Nikolay G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The nonlinear absorption of radio waves (200 - 800 MHz) in a noncollinear cubic antiferromagnet Mn3Al2Ge3O12 in an external magnetic field H || [001] has been studied in the temperature range of 1.2 - 4.2 K. We attribute the observed dissipation of the electromagnetic energy to the parametric excitation of inhomogeneous surface waves at the boundaries of antiferromagnetic domains.
description: 7 pages, 4 figures
Explicit formulae for Chern-Simons invariants of the hyperbolic orbifolds of the knot with Conway's notation $C(2n, 3)$
Creators: name: Ham, Ji-young
name: Lee, Joongul
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57N10, 57R19, 57M99, 57M25, 57M27, 57M50

description: We calculate the Chern-Simons invariants of the hyperbolic orbifolds of the knot with Conway's notation $C(2n, 3)$ using the Schläfli formula for the generalized Chern-Simons function on the family of $C(2n,3)$ cone-manifold structures. We present the concrete and explicit formula of them. We apply the general instructions of Hilden, Lozano, and Montesinos-Amilibia and extend the Ham and Lee's methods. As an application, we calculate the Chern-Simons invariants of cyclic coverings of the hyperbolic $C(2n,3)$ orbifolds.
description: 10 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1411.2383
Serendipitous discovery of the faint solar twin Inti 1
Creators: name: Galarza, Jhon Yana
name: Meléndez, Jorge
name: Cohen, Judith G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Methods. We determine the atmospheric parameters and differential abundances using high-resolution ($R \approx 50 000$), high signal-to-noise (S/N $\approx$ 110 - 240 per pixel) Keck HIRES spectra for our solar twin candidate, the previously known solar twin HD 45184, and the Sun. Results. For the bright solar twin HD 45184, we found $T_{\rm{eff}} = 5864 \pm 9$ K, log $g = 4.45 \pm 0.03$ dex, $v_{t} = 1.11 \pm 0.02$ $\rm{km\ {s}}^{-1}$, and [Fe/H]$ = 0.04 \pm 0.01$ dex, which are in good agreement with previous works. The star Inti 1 has atmospheric parameters $T_{\rm{eff}} = 5837 \pm 11$ K, log $g = 4.42 \pm 0.03$ dex, $v_{t} = 1.04 \pm 0.02$ $\rm{km\ {s}}^{-1}$, and [Fe/H]$ = 0.07 \pm 0.01$ dex that are higher than solar. The age and mass of the solar twin HD 45184 (3 Gyr and 1.05 $\rm{M_{\odot}}$) and the faint solar twin Inti 1 (4 Gyr and 1.04 $\rm{M_{\odot}}$) were estimated using isochrones. The differential analysis shows that HD 45184 presents an abundance pattern that is similar to typical nearby solar twins; this means this star has an enhanced refractory relative to volatile elements, while Inti 1 has an abundance pattern closer to solar, albeit somewhat enhanced in refractories. The abundance pattern of HD 45184 and Inti 1 could be reproduced by adding $\approx 3.5\ \rm{M_{\oplus}}$ and $\approx 1.5\ \rm{M_{\oplus}}$ of Earth-like material to the convective zone of the Sun. Conclusions. The star Inti 1 is a faint solar twin, therefore, it could be used to calibrate the zero points of different photometric systems. The distant solar twin Inti 1 has an abundance pattern similar to the Sun with only a minor enhancement in the refractory elements. It would be important to analyze other distant solar twins to verify whether they share the Sun's abundance pattern or if they are enhanced in refractories, as is the case in the majority of nearby solar twins.
Focusing effect of bent GaAs crystals for gamma-ray Laue lenses: Monte Carlo and experimental results
Creators: name: Virgilli, E.
name: Frontera, F.
name: Rosati, P.
name: Bonnini, E.
name: Buffagni, E.
name: Ferrari, C.
name: Stephen, J. B.
name: Caroli, E.
name: Auricchio, N.
name: Basili, A.
name: Silvestri, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We report on results of observation of the focusing effect from the planes (220) of Gallium Arsenide (GaAs) crystals. We have compared the experimental results with the simulations of the focusing capability of GaAs tiles through a developed Monte Carlo. The GaAs tiles were bent using a lapping process developed at the cnr/imem - Parma (Italy) in the framework of the laue project, funded by ASI, dedicated to build a broad band Laue lens prototype for astrophysical applications in the hard X-/soft gamma-ray energy range (80-600 keV). We present and discuss the results obtained from their characterization, mainly in terms of focusing capability. Bent crystals will significantly increase the signal to noise ratio of a telescope based on a Laue lens, consequently leading to an unprecedented enhancement of sensitivity with respect to the present non focusing instrumentation.
description: 22 pages, 36 figures
Befreiung des Körperausdruckes in der afrikanischen Liturgie
Creators: name: Boka Di Mpasi Londi, Simon Pierre
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 16 Nr. 2 (1980): Concilium: Internationale Zeitschrift für Theologie, Band 16, Heft 2
Observational detection of drift velocity between ionized and neutral species in solar prominences
Creators: name: Khomenko, Elena
name: Collados, Manuel
name: Diaz, Antonio J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report a detection of differences in ion and neutral velocities in prominences using high resolution spectral data obtained in September 2012 at the German Vacuum Tower Telescope (Observatorio del Teide, Tenerife). A time series of scans of a small portion of a solar prominence was obtained simultaneously with a high cadence using the lines of two elements with different ionization states, namely the CaII 8542 A and the HeI 10830 A. Displacements, widths and amplitudes of both lines were carefully compared to extract dynamical information about the plasma. Many dynamical features are detected, such as counterstreaming flows, jets and propagating waves. In all the cases we find very strong correlation between the parameters extracted from the lines of both elements, confirming that both trace the same plasma. Nevertheless, we also find short-lived transients where this correlation is lost. These transients are associated with the ion-neutral drift velocities of the order of several hundred m/s. The patches of non-zero drift velocity show coherence on time-distance diagrams.
description: To appear in The Astrophysical Journal
Generic uniqueness of a structured matrix factorization and applications in blind source separation
Creators: name: Domanov, Ignat
name: DeLathauwer, Lieven
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M20, 93B30

description: Algebraic geometry, although little explored in signal processing, provides tools that are very convenient for investigating generic properties in a wide range of applications. Generic properties are properties that hold "almost everywhere". We present a set of conditions that are sufficient for demonstrating the generic uniqueness of a certain structured matrix factorization. This set of conditions may be used as a checklist for generic uniqueness in different settings. We discuss two particular applications in detail. We provide a relaxed generic uniqueness condition for joint matrix diagonalization that is relevant for independent component analysis in the underdetermined case. We present generic uniqueness conditions for a recently proposed class of deterministic blind source separation methods that rely on mild source models. For the interested reader we provide some intuition on how the results are connected to their algebraic geometric roots.
description: 10 pages
3D Sisyphus Cooling of Trapped Ions
Creators: name: Ejtemaee, S.
name: Haljan, P. C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Using a laser polarization gradient, we realize 3D Sisyphus cooling of $^{171}$Yb$^+$ ions confined in and near the Lamb-Dicke regime in a linear Paul trap. The cooling rate and final mean motional energy of a single ion are characterized as a function of laser intensity and compared to semiclassical and quantum simulations. Sisyphus cooling is also applied to a linear string of four ions to obtain a mean energy of 1-3 quanta for all vibrational modes, an approximately order-of-magnitude reduction below Doppler cooled energies. This is used to enable subsequent, efficient sideband laser cooling.
description: 6 pages, 4 figures
Report_2023_10
Creators: name: Pallottino Federico
name: Costa Corrado
name: Violino Simona
name: Figorilli, Simone
name: Antonucci Francesca
Publisher: name: OSF
Year: 2024

description: Sperandio G, Violino S, Figorilli S, Antonucci A, Pallottino F, Ripa C, Costa C, 2023. NOTA TECNICA UFFICIALE “Valutazione e prospettive per la realizzazione di una piattaforma informatica di gamification e blockchain per incentivare il recupero dei rifiuti rinvenuti in mare” (PROGETTO TERMOLI SEA CLEANERS) (prot. n. 0094108 del 17/10/2023)
Controlling dynamical entanglement in a Josephson tunneling junction
Creators: name: Ziegler, K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the evolution of an entangled many-body state in a Josephson tunneling junction. A N00N state, which is a superposition of two complementary Fock states, appears in the evolution with sufficient probability only for a moderate many-body interaction on an intermediate time scale. This time scale is inversely proportional to the tunneling rate. Interaction between particles supports entanglement: The probability for creating an entangled state decays exponentially with the number of non-interacting particles, whereas it decays only like the inverse square root of the number of interacting particles.
description: 9 pages, 5 figures
Campodea (Paurocampa) ribauti Silvestri 1912
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Campodea
Campodea ribauti

description: Campodea (Paurocampa) ribauti Silvestri, 1912
Campodea (Paurocampa) ribauti Silvestri, 1912: 139, figs XXV–XXVI.
Diagnosis (Silvestri 1912; Denis 1932b; Bareth 2006)
Body length 1.5–5.0 mm; epicuticle with microdenticles; short clothing setae with 1–3 distal barbs; antennae with 20–26 antennomeres; sensillum of third antennomere in dorsal position; cupuliform organ with four to five simple olfactory chemoreceptors; short ma and la pronotal macrosetae with barbs along distal half, long lp pronotal macrosetae with barbs almost from basis to distal two-thirds (Bareth (2006) noted that the middle-sized macrosetae on the pronotum are poorly barbed); marginal setae thick and with short barbs; 1+1 la, 1+1 lp macrosetae on VI–VII urotergites, 3+3 lp on VIII urotergite and 5+5 lp on IX abdominal segment; cerci shorter than body with 11 articles covered in long macrosetae with barbs and a few clothing setae; small spermatozoid fascicles 20–25 μm in diameter and 3 μm wide, spiral filament with 1.5 ×, 100 μm long and 0.5–1 μm in diameter.
Habitat and distribution
Soil-dwelling species with a preference for the upper layer of the soil in humid habitats, also found in caves. It has a limited distribution in the central area of the Pyrenees (Denis 1932b; Condé 1948a, Condé & Mathieu 1957).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on pages 86-87, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Relativistic X-ray reverberation modelling of the combined time-averaged and lag-energy spectra in AGN
Creators: name: Chainakun, P.
name: Young, A. J.
name: Kara, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: General relativistic ray tracing simulations of the time-averaged spectrum and energy-dependent time delays in AGN are presented. We model the lamp-post geometry in which the accreting gas is illuminated by an X-ray source located on the rotation axis of the black hole. The spectroscopic features imprinted in the reflection component are modelled using REFLIONX. The associated time delays after the direct continuum, known as reverberation lags, are computed including the full effects of dilution and ionization gradients on the disc. We perform, for the first time, simultaneous fitting of the time-averaged and lag-energy spectra in three AGN: Mrk 335, IRAS 13224-3809 and Ark 564 observed with XMM-Newton. The best fitting source height and central mass of each AGN partly agree with those previously reported. We find that including the ionization gradient in the model naturally explains lag-energy observations in which the 3 keV and 7-10 keV bands precede other bands. To obtain the clear 3 keV and 7-10 keV dips in the lag-energy profile, the model requires either a source height > 5$r_g$, or a disc that is highly ionized at small radii and is colder further out. We also show that fitting the lag or the mean spectra alone can lead to different results and interpretations. This is therefore important to combine the spectral and timing data in order to find the plausible but self-consistent fits which is achievable with our model.
description: 14 pages, 13 figures, 2 tables, accepted for publication in MNRAS
Mechanistic Insights into the Fundamentals of Photocatalytic Reduction of Carbon Dioxide from First Principles Density Functional Theory Studies
Creators: name: ER, CHEN CHEN
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 340606
subject: Photochemistry
classificationCode: 340601
subject: Catalysis and mechanisms of reactions
classificationCode: 401807
subject: Nanomaterials
classificationCode: 461103
subject: Deep learning

description: The excessive emission of carbon dioxide due to the rapid depletion of fossil fuels has led to severe global energy landscape and environmental changes. The photocatalytic conversion of carbon dioxide into hydrocarbon fuels through solar energy is a green and sustainable technology to solve the imminent crisis. Nevertheless, the low efficiency and unsatisfactory product selectivity hinder them as a viable process. Thus, the question begs the existence of a specific tenet to be upheld when spearheading novel materials. In this project, density functional theory calculations were performed to study the fundamentals and reaction mechanisms of photocatalytic carbon dioxide reduction.
Conductance saturation in a series of highly transmitting molecular junctions
Creators: name: Yelin, T.
name: Korytar, R.
name: Sukenik, N.
name: Vardimon, R.
name: Kumar, B.
name: Nuckolls, C.
name: Evers, F.
name: Tal, O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Understanding the properties of electronic transport across metal-molecule interfaces is of central importance for controlling a large variety of molecular-based devices such as organic light emitting diodes, nanoscale organic spin-valves and single-molecule switches. One of the primary experimental methods to reveal the mechanisms behind electronic transport through metal-molecule interfaces is the study of conductance as a function of molecule length in molecular junctions. Previous studies focused on transport governed either by tunneling or hopping, both at low conductance. However, the upper limit of conductance across molecular junctions has not been explored, despite the great potential for efficient information transfer, charge injection and recombination processes. Here, we study the conductance properties of highly transmitting metal-molecule-metal interfaces, using a series of single-molecule junctions based on oligoacenes with increasing length. We find that the conductance saturates at an upper limit where it is independent of molecule length. Furthermore, we show that this upper limit can be controlled by the character of the orbital hybridization at the metal-molecule interface. Using two prototype systems, in which the molecules are contacted by either Ag or Pt electrodes, we reveal two different origins for the saturation of conductance. In the case of Ag-based molecular junctions, the conductance saturation is ascribed to a competition between energy level alignment and level broadening, while in the case of Pt-based junctions, the saturation is attributed to a band-like transport. The results are explained by an intuitive model, backed by ab-initio transport calculations. Our findings shed light on the mechanisms that constrain the conductance at the high transmission limit, providing guiding principles for the design of highly conductive metal-molecule interfaces.
description: 11 pages, 5 figures, Supplementary Information
Latency Optimization for Resource Allocation in Cloud Computing System
Creators: name: Nosrati, Masoud
name: Chalechale, Abdolah
name: Karimi, Ronak
Publisher: name: arXiv
Year: 2016
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Recent studies in different fields of science caused emergence of needs for high performance computing systems like Cloud. A critical issue in design and implementation of such systems is resource allocation which is directly affected by internal and external factors like the number of nodes, geographical distance and communication latencies. Many optimizations took place in resource allocation methods in order to achieve better performance by concentrating on computing, network and energy resources. Communication latencies as a limitation of network resources have always been playing an important role in parallel processing (especially in fine-grained programs). In this paper, we are going to have a survey on the resource allocation issue in Cloud and then do an optimization on common resource allocation method based on the latencies of communications. Due to it, we added a table to Resource Agent (entity that allocates resources to the applicants) to hold the history of previous allocations. Then, a probability matrix was constructed for allocation of resources partially based on the history of latencies. Response time was considered as a metric for evaluation of proposed method. Results indicated the better response time, especially by increasing the number of tasks. Besides, the proposed method is inherently capable for detecting the unavailable resources through measuring the communication latencies. It assists other issues in cloud systems like migration, resource replication and fault tolerance.
description: 12 pages, 5 figures, In proceeding of ICCSA 2015, published by Springer LNCS
Right Heart Flow Dynamics with Mechanical Circulatory Support of the Pulmonary Circulation
Creators: name: THUM, KAR YING
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 400303
subject: Biomechanical engineering
classificationCode: 401203
subject: Biomedical fluid mechanics

description: Right ventricular assist device (RVAD) is a mechanical support that helps the heart to pump blood for patients with severe right heart failure. However, patients receiving an RVAD are at risk of blood clot formation which can lead to serious issues. This thesis aimed to understand how the RVAD affects the blood flow patterns within the right heart and predict the risks of blood clot formation. The thesis found that the RVAD surgical implantation technique can have an influence on the risk of blood clot formation, and careful consideration should be taken during implantation to improve patient outcomes.
Mean distribution approach to spin and gauge theories
Creators: name: Akerlund, Oscar
name: de Forcrand, Philippe
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We formulate self-consistency equations for the distribution of links in spin models and of plaquettes in gauge theories. This improves upon known mean-field, mean-link, and mean-plaquette approximations in such that we self-consistently determine all moments of the considered variable instead of just the first. We give examples in both Abelian and non-Abelian cases.
description: 11 pages, 8 figures
Using Cystine Peptidomimetics To Uncover Mechanism of Action
Creators: name: KENNEDY, ADAM CHRISTOPHER
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 340401
subject: Biologically active molecules
classificationCode: 340503
subject: Organic chemical synthesis

description: The shape and structure of peptides determine their biological activity. This thesis examined the role of important cyclising structures, called disulfide bridges, within peptides on biological activity. By replacing these bridges with more stable alternatives, this thesis demonstrates critical information into designing new potent therapeutic drugs for both pain relief and use in easing childbirth.
An Intermediate Water Cherenkov Detector at J-PARC
Creators: name: Scott, Mark
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Recent neutrino oscillation results have shown that the existing long baseline experiments have some sensitivity to the effects of CP violation in the neutrino sector. This sensitivity is currently statistically limited, but the next generation of experiments, DUNE and Hyper-K, will provide an order of magnitude more events. To reach the full potential of these datasets we must achieve a commensurate improvement in our understanding of the systematic uncertainties that beset them. This talk describes two proposed intermediate detectors for the current and future long baseline oscillation experiments in Japan, TITUS and NuPRISM. These detectors are discussed in the context of the current T2K oscillation analysis, highlighting the ways in which they could reduce the systematic uncertainty on this measurement. The talk also describes the short baseline oscillation sensitivity of NuPRISM along with the neutrino scattering measurements the detector makes possible.
description: 11 pages, 15 figures, Proceedings of NuInt2015, Osaka, November 2015
The quasi-neutral limit in optimal semiconductor design
Creators: name: Pinnau, Rene
name: Totzeck, Claudia
name: Tse, Oliver
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We study the quasi-neutral limit in an optimal semiconductor design problem constrained by a nonlinear, nonlocal Poisson equation modelling the drift diffusion equations in thermal equilibrium. While a broad knowledge on the asymptotic links between the different models in the semiconductor model hierarchy exists, there are so far no results on the corresponding optimization problems available. Using a variational approach we end up with a bi-level optimization problem, which is thoroughly analysed. Further, we exploit the concept of Gamma-convergence to perform the quasi-neutral limit for the minima and minimizers. This justifies the construction of fast optimization algorithms based on the zero space charge approximation of the drift-diffusion model. The analytical results are underlined by numerical experiments confirming the feasibility of our approach.
The numerical approach to quantum field theory in a non-commutative space
Creators: name: Panero, Marco
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Numerical simulation is an important non-perturbative tool to study quantum field theories defined in non-commutative spaces. In this contribution, a selection of results from Monte Carlo calculations for non-commutative models is presented, and their implications are reviewed. In addition, we also discuss how related numerical techniques have been recently applied in computer simulations of dimensionally reduced supersymmetric theories.
description: 15 pages, 6 figures, invited talk presented at the Humboldt Kolleg "Open Problems in Theoretical Physics: the Issue of Quantum Space-Time", to appear in the proceedings of the Corfu Summer Institute 2015 "School and Workshops on Elementary Particle Physics and Gravity" (Corfu, Greece, 1-27 September 2015)
Finding the Underlying Mechanism in the Relationship Between Socioeconomic Condition and Mental Health During the Covid-19 Pandemic: The Role of Economic-Worries
Creators: name: CHAN, JEE KEI
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 520505
subject: Social psychology

description: Can money buy us better mental health? We used to believe that having better income, more wealth or higher education can help us to have better mental well-being, as we can use these resources flexibly for our mental health benefits. However, our results showed otherwise. During the Covid-19 pandemic, our studies showed that having more of such resources does not necessarily translate to better mental health. Instead, it is our consistent worrying about the uncertainty of our future financial situation that troubled our minds. Thus, regardless whether one is rich or poor, as long as one harbours economic worries, his or her mental health would be compromised.
Micromagnetic simulation of exchange coupled ferri-/ferromagnetic composite in bit patterned media
Creators: name: Oezelt, Harald
name: Kovacs, Alexander
name: Wohlhüter, Phillip
name: Kirk, Eugenie
name: Nissen, Dennis
name: Matthes, Patrick
name: Heyderman, Laura Jane
name: Albrecht, Manfred
name: Schrefl, Thomas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ferri-/ferromagnetic exchange coupled composites are promising candidates for bit patterned media because of the ability to control the magnetic properties of the ferrimagnet by its composition. A micromagnetic model for the bilayer system is presented where we also incorporate the microstructural features of both layers. Micromagnetic finite element simulations are performed to investigate the magnetization reversal behaviour of such media. By adding the exchange coupled ferrimagnet to the ferromagnet, the switching field could be reduced by up to $40\,\%$ and also the switching field distribution is narrowed. To reach these significant improvements, an interface exchange coupling strength of $2\,\mathrm{mJ/m^2}$ is required.
description: 4 pages, 5 figures
Caenorhabditis elegans GANA-1: An orthologue enzyme for human Fabry disease
Creators: name: CHEONG, CLERANCE SU YEE
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 310902
subject: Animal cell and molecular biology
classificationCode: 310205
subject: Proteomics and metabolomics

description: Fabry disease (FD) is an X-linked inherited lysosomal storage disease (LSD) caused by defective human α-galactosidase A enzyme, resulting in subsequent systemic accumulation of harmful glycosphingolipid known as globotriaosylceramide (Gb3), ultimately cause premature death. This thesis explores: (1) the functional activity of Caenorhabditis elegans (C. elegans) GANA-1 protein via in-silico studies; (2) the possibility of using C. elegans as FD small animal model; (3) the potential of C. elegans GANA-1 protein in reducing the Gb3 in FD cells.
Business Integrated Industrial Design Innovation (BIIDI) process model development
Creators: name: Torrens, George
Publisher: name: Loughborough University
Year: 2024
Subjects: classificationCode: 36
subject: Creative arts and writing
classificationCode: 40
subject: Engineering
classificationCode: 39
subject: Education
classificationCode: 38
subject: Economics

description: The Business Integrated Industrial Design Innovation, (BIIDI), process diagram and associated spreadsheet are designed as a checklist to help all actors involved in innovation and NPD for Assistive products to be aware of the constraints and opportunities that each stage of their start-up NPD process. The data set sheets present the processing and development of the integration of five different models of NPD for a start-up: 1) Business model canvas; 2) Design management; 3) Innovation network; 4) Design thinking; and, 5) Industrial design.
EDF-VD Scheduling of Mixed-Criticality Systems with Degraded Quality Guarantees
Creators: name: Liu, Di
name: Spasic, Jelena
name: Chen, Gang
name: Guan, Nan
name: Liu, Songran
name: Stefanov, Todor
name: Yi, Wang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: This paper studies real-time scheduling of mixed-criticality systems where low-criticality tasks are still guaranteed some service in the high-criticality mode, with reduced execution budgets. First, we present a utilization-based schedulability test for such systems under EDF-VD scheduling. Second, we quantify the suboptimality of EDF-VD (with our test condition) in terms of speedup factors. In general, the speedup factor is a function with respect to the ratio between the amount of resource required by different types of tasks in different criticality modes, and reaches 4/3 in the worst case. Furthermore, we show that the proposed utilization-based schedulability test and speedup factor results apply to the elastic mixed-criticality model as well. Experiments show effectiveness of our proposed method and confirm the theoretical suboptimality results.
Design and Development of a Stiffness Varying Soft Robot Arm Module
Creators: name: CHIN, ZHI HUI
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 460205
subject: Intelligent robotics
classificationCode: 400708
subject: Mechatronics hardware design and architecture
classificationCode: 400799
subject: Control engineering, mechatronics and robotics not elsewhere classified

description: This thesis explores the design and development of a stiffness-varying soft robot arm. Compliant materials were implemented, enabling it to bend and extend while having internal stiffening mechanisms. Various prototypes were fabricated using silicone casting and 3D printing. The experiments conducted revealed that increased pressures and presence of a stiffening mechanism contributes to force increase exerted by the soft robot arm. Moreover, an increase in strength was also observed with a greater vacuum pressure in the stiffening mechanism. The findings contribute to the development of soft robot arms with improved capabilities compared to the state of the arts.
Symbolische und künstlerische Ausdrucksformen im Gottesdienst
Creators: name: Maldonado, Luis
name: Power, David N.
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 16 Nr. 2 (1980): Concilium: Internationale Zeitschrift für Theologie, Band 16, Heft 2
The Blazhko Effect
Creators: name: Smolec, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We review the recent progress in our understanding of the Blazhko effect in RR Lyrae stars.
description: Invited talk; to be published in the Proceedings of the XXXVII Meeting of the Polish Astronomical Society
Business Integrated Industrial Design (BIIDI) process checklist template
Creators: name: Welsh, Ruth
name: Torrens, George
Publisher: name: Loughborough University
Year: 2024
Subjects: classificationCode: 36
subject: Creative arts and writing
classificationCode: 38
subject: Economics
classificationCode: 39
subject: Education
classificationCode: 40
subject: Engineering

description: The Business Integrated Industrial Design Innovation, (BIIDI), process template are designed as a checklist to help all actors involved in innovation and NPD for Assistive products to be aware of the constraints and opportunities that each stage of their start-up NPD process. The data set sheets present the processing and development of the integration of five different models of NPD for a start-up: 1) Business model canvas; 2) Design management; 3) Innovation network; 4) Design thinking; and, 5) Industrial design.
Initial state and pre-equilibrium effects in small systems
Creators: name: Schlichting, S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss the importance of initial state and early time effects with regard to the theoretical understanding of long range azimuthal correlations observed in high-multiplicity $p+p$ and $p+A$ collisions.
description: 6 pages; Proceedings of Quark Matter 2015, Kobe, Japan -- Invited plenary talk in special session on "QGP in small systems?"
Horizon Shells: Classical Structure at the Horizon of a Black Hole
Creators: name: Blau, Matthias
name: O'Loughlin, Martin
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We address the question of the uniqueness of the Schwarzschild black hole by considering the following question: How many meaningful solutions of the Einstein equations exist that agree with the Schwarzschild solution (with a fixed mass m) everywhere except maybe on a codimension one hypersurface? The perhaps surprising answer is that the solution is unique (and uniquely the Schwarzschild solution everywhere in spacetime) *unless* the hypersurface is the event horizon of the Schwarzschild black hole, in which case there are actually an infinite number of distinct solutions. We explain this result and comment on some of the possible implications for black hole physics.
description: 1+5 pages, Essay written for the Gravity Research Foundation 2016 Awards for Essays on Gravitation, based on arXiv:1512.02858
Investigating the impact of optical selection effects on observed rest frame prompt GRB properties
Creators: name: Turpin, Damien
name: Heussaff, Vincent
name: Dezalay, Jean-Pascal
name: Atteia, Jean-Luc
name: Klotz, Alain
name: Dornic, Damien
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: 85-XX Astronomy and astrophysics

description: Measuring gamma-ray burst (GRB) properties in their rest-frame is crucial to understand the physics at work in gamma-ray bursts. This can only be done for GRBs with known redshift. Since redshifts are usually measured from the optical spectrum of the afterglow, correlations between prompt and afterglow emissions may introduce biases in the distribution of rest-frame properties of the prompt emission. Our analysis is based on a sample of 90 GRBs with good optical follow-up and well measured prompt emission. 76 of them have a measure of redshift and 14 have no redshift. We estimate their optical brightness with their R magnitude measured two hours after the trigger and compare the rest frame prompt properties of different classes of GRB afterglow brightness. We find that the optical brightness of GRBs in our sample is mainly driven by their intrinsic afterglow luminosity. We show that GRBs with low and high afterglow optical fluxes have similar Epi , Eiso , Liso , indicating that the rest-frame distributions computed from GRBs with a redshift are not significantly distorted by optical selection effects. However we found that the rest frame T90 distribution is not immune to optical selection effect, which favor the selection of GRBs with longer durations. Finally, we note that GRBs in the upper part of the Epi-Eiso plane have fainter optical afterglows and we show that optical selection effects strongly favor the detection of GRBs with bright afterglows located close or below the best-fit Epi-Eiso relation, whose redshift is easily measurable.
description: 41 pages, 10 figures, 7 tables. arXiv admin note: substantial text overlap with arXiv:1503.02760