cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Heavy-to-light form factors: sum rules on the light cone and beyond
Creators: name: Lucha, Wolfgang
name: Melikhov, Dmitri
name: Simula, Silvano
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We report the first systematic analysis of the off-light-cone effects in sum rules for heavy-to-light form factors. These effects are investigated in a model based on scalar constituents, which allows a technically rather simple analysis but has the essential features of the analogous QCD calculation. The correlator relevant for the extraction of the heavy-to-light form factor is calculated in two different ways: first, by adopting the full Bethe-Salpeter amplitude of the light meson and, second, by performing the expansion of this amplitude near the light cone $x^2=0$. We demonstrate that the contributions to the correlator from the light-cone term $x^2=0$ and the off-light-cone terms $x^2\ne 0$ have the same order in the $1/m_Q$ expansion. The light-cone correlator, corresponding to $x^2=0$, is shown to systematically overestimate the full correlator, the difference being $\sim Λ_{\rm QCD}/δ$, with $δ$ the continuum subtraction parameter of order 1 GeV. Numerically, this difference is found to be 10-20%.
description: revtex 14 pages, version to be published in Phys. Rev. D (discussion in Sect. 3 extended, example in Sect. 4 added)
Ηθικά διλήμματα κατά την έναρξη της ζωής
Creators: name: Μητρούσκα, Ανδρομάχη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ιατρικώς Υποβοηθούμενη Αναπαραγωγή (ΙΥΑ)
παρένθετη μητρότητα
βέλτιστο συμφέρον του παιδιού που πρόκειται να γεννηθεί
In Vitro Fertilization (IVF)
surrogate motherhood
best interest of the unborn child

description: Σκοπός της παρούσας μεταπτυχιακής εργασίας είναι η παρουσίαση της ραγδαίας ανάπτυξης των επιστημών της Γενετικής και της Βιοτεχνολογίας που – μεταξύ́ άλλων – έχουν ως στόχο την αντιμετώπιση της υπογονιμότητας και της στειρότητας καιως αποτέλεσμα, έδωσαν σε εκατομμύρια ανθρώπους τη χαρά́ της μητρότητας / πατρότητας. Ωστόσο, οι σύγχρονες μέθοδοι της «Ιατρικώς Υποβοηθουμένης Αναπαραγωγής»( Ι.Υ.Α.) αντιμετωπίζονται από́ ένα μεγάλο ποσοστό́ του πληθυσμού́ με επιφυλακτικότητα και δυσπιστία, εγείροντας ηθικά́ διλήμματα, όπως αν το έμβρυο που συλλαμβάνεται είναι πρόσωπο ή πράγμα, αν το έμβρυο πρέπει να είναι το αποτέλεσμα μιας σχέσης, κατά́ πόσο η ιατρικοποίηση της αρχής της ζωής αποσκοπεί́ στο βέλτιστο συμφέρον του παιδιού́ που πρόκειται να γεννηθεί́ και, εν τέλει, ποια ηθική́ στάση «συνοδεύει» τη μέθοδο της παρένθετης μητρότητας
description: The purpose of the present graduate paper is the presentation of the rapid evolution on the sciences of Genetics and Biotechnology that- among others- aim at dealing with infertility and, as a result, gave the opportunity for millions of people to enjoy motherhood/fatherhood. However, contemporary methods of “In Vitro Fertilization”(IVF) are considered by a great number of the population with hesitation and disbelief, creating moral dilemmas such as if the conceived embryo is a person or an object, if the embryo is the result of a relationship or if the beginning of life that is created in the lab aims at the best interest of the unborn child and, finally, which moral stance we must preserve at surrogate motherhood
The Signature of Primordial Grain Growth in the Polarized Light of the AU Mic Debris Disk
Creators: name: Graham, James R.
name: Kalas, Paul G.
name: Matthews, Brenda C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used the Hubble Space Telescope/ACS coronagraph to make polarization maps of the AU Mic debris disk. The fractional linear polarization rises monotonically from about 0.05 to 0.4 between 20 and 80 AU. The polarization is perpendicular to the disk, indicating that the scattered light originates from micron sized grains in an optically thin disk. Disk models, which simultaneously fit the surface brightness and polarization, show that the inner disk (< 40-50 AU) is depleted of micron-sized dust by a factor of more than 300, which means that the disk is collision dominated. The grains have high maximum linear polarization and strong forward scattering. Spherical grains composed of conventional materials cannot reproduce these optical properties. A Mie/Maxwell-Garnett analysis implicates highly porous (91-94%) particles. In the inner Solar System, porous particles form in cometary dust, where the sublimation of ices leaves a "bird's nest" of refractory organic and silicate material. In AU Mic, the grain porosity may be primordial, because the dust "birth ring" lies beyond the ice sublimation point. The observed porosities span the range of values implied by laboratory studies of particle coagulation by ballistic cluster-cluster aggregation. To avoid compactification, the upper size limit for the parent bodies is in the decimeter range, in agreement with theoretical predictions based on collisional lifetime arguments. Consequently, AU Mic may exhibit the signature of the primordial agglomeration process whereby interstellar grains first assembled to form macroscopic objects.
description: 12 pages, 8 figures, ApJ, in press
Reconstruction of stellar images from correlations
Creators: name: Shi, Xiaotian
Publisher: name: University of British Columbia
Year: 2008

description: The problem of object reconstruction from a series of short-exposure astronomical image data observed by ground-based telescopes is addressed. The observations are seriously degraded by atmospheric turbulence as well as corrupted by photon noise, detection noise and background noise. An approach for the reconstruction of the unknown object using the "self cross correlation” is proposed and implemented. This self cross correlation is defined as the cross correlation between an image observation and a truncated part of it. The relation amongst the phase of the cross spectrum, the phase of the object and the edges in the object are established. Based on these relations some efficient and effective algorithms for retrieving the unknown phase of the object and its modulus are developed. These algorithms are found to be insensitive to the presence of noise. Writing the Fourier transform (FT) of an image a as IA en)°, we call the inverse FT of the phasor part eie° as the phasor-image of a. We show that the phasor-image of the self cross correlation preserves the edges of the unknown object. If the object does not contain edges then its phasor-image represents an estimate of the Fourier phase of the unknown object. If all the stars and sub-objects in the object have edges then a phase retrieval method based on the iterative FT method is proposed. In this case the iterative FT method uses the edges obtained from the phasor-image of the average cross spectrum as object support bounds constraints. If some of the stars or sub-objects have edges then a non iterative phase retrieval method is developed. If none of the stars has edges then a modified version of this method is used to retrieve the object phase. We also address the anisoplanatic atmospheric turbulence case. We show that our approach can be extended to deal with the object reconstruction problem under such a condition. This is unlike the existing methods which only apply to the isoplanatic case. We evaluate the performance of our algorithms by comparing the signal-to-noise ratios with those of existing reconstruction methods. The results from both simulated and real astronomical data demonstrate the superiority of our methods in accuracy and computational speed.
A light curve model of V2491 Cyg: Classical nova outburst on a cool and massive white dwarf
Creators: name: Kato, Mariko
name: Saio, Hideyuki
name: Hachisu, Izumi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The classical nova V2491 Cyg was once suggested to be a recurrent nova. We have broadly reproduced the light curve of V2491 Cyg by a nova outburst model on a cold $1.36~M_\odot$ white dwarf (WD), which strongly suggests that V2491 Cyg is a classical nova outbursting on a cold very massive WD rather than a recurrent nova outbursting on a warmer WD like the recurrent nova RS Oph. In a long-term evolution of a cataclysmic binary, an accreting WD has been settled down to a thermal equilibrium state with the balance of gravitational energy release and neutrino loss. The central temperature of the WD is uniquely determined by the energy balance. The WD is hot (cold) for a high (low) mass-accretion rate. We present the central temperatures, ignition masses, ignition radii, and recurrence periods for various WD masses and mass-accretion rates. In a classical nova, which corresponds to a low mass-accretion rate, the WD is cool and strongly degenerated and the ignition mass is large, which result in a strong nova outburst. In a recurrent nova, the WD is relatively warmer because of a high mass accretion rate and the outburst is relatively weaker. The gravitational energy release substantially contributes to the luminosity during the recurrent nova outbursts. We compare physical properties between classical novae and recurrent novae and discuss the essential differences between them.
description: 18 pages, 9 figures, accepted by PASJ
Η λογική της διαφάνειας στο «Ἂξιον ἐστί» του Οδυσσέα Ελύτη
Creators: name: Κώττη, Ευδοξία Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ελύτης
διαφάνεια
φως
Elytis
transparency
light

description: Στην παρούσα εργασία επιλέχθηκε η ενασχόληση με το σπουδαιότερο Ελύτειο έργο, το «Ἂξιον ἐστί». Σε ένα γενικότερο πλαίσιο, πολλοί είναι αυτοί οι οποίοι προσέγγισαν το «Ἂξιον ἐστί» από μία πλευρά λογοτεχνική. Δεν είναι μικρό το ενδιαφέρον για τη δομή και τον τρόπο συγγραφής που επιλέχθηκε από τον ποιητή του Αιγαίου για να συγγραφεί το παραπάνω αριστούργημα. Ωστόσο, είναι ιδιαίτερα σπουδαία τα νοήματα που αναδύονται μέσα από αυτό. Το εξεταζόμενο έργο φανερώνει και χαρακτηρίζεται από μία έντονη φιλοσοφικότητα, η οποία έχει ένα συγκεκριμένο μέσο για να εκφράζεται κάθε φορά. Το μέσο αυτό δεν είναι άλλο από τη διαφάνεια. Ο Οδυσσέας Ελύτης χρησιμοποίησε τη διαφάνεια ως το μέσο που θα του επιτρέπει να επικοινωνεί με τα νοήματα που του απευθύνονται και τα οποία αποτυπώνει πάνω στο χαρτί με μοναδικό τρόπο. Η ενασχόληση με το «Ἂξιον ἐστί» -και με συγκεκριμένα αποσπάσματα που προέρχονται από το ίδιο- ως ένα έργο φιλοσοφίας επιτρέπει στον καθένα να αντιληφθεί πώς δύναται η τέχνη –αυτής της λογοτεχνίας, στη συγκεκριμένη περίπτωση- να συνυπάρξει με τη φιλοσοφία και η μία να συμπληρώνει την άλλη· πώς το αποτέλεσμα της συνεργασίας των δύο είναι η απελευθέρωση του φωτός
description: In the present work has been chosen to deal with the most important Elytian work, "Axion esti". In a more general context, there are many who have approached "Axion esti" from a literary point of view. Τhere is great interest in the structure and manner of writing, chosen by the poet of the Aegean to write the above masterpiece. However, the meanings that emerge through it are particularly important. The work under consideration reveals and is characterized by an intense philosophy, which has a specific means of expressing itself at all times. This means is transparency. Udysseus Elytis used transparency as a means of enabling him to communicate with the meanings which he addressed, which he imprinted on paper in a unique way. Dealing with " Axion One' - and with specific extracts from it - as a work of philosophy allows one to understand how art -literature, in this case- can coexist with philosophy and how the one complements the other; how the result of the co-operation is the release of light
Untersuchung von Brennverfahren für Erdgas und Biomethan am Beispiel von Industriemotoren für den landwirtschaftlichen Einsatz
Creators: name: Prehn, Sascha
Publisher: name: Universität Rostock
Year: 2018
Subjects: subject: 620 Engineering & allied operations

description: Die Arbeit behandelt eine systematische Untersuchung und Bewertung verschiedener ottomotorischer Brennverfahren in Hinblick auf niedrigste Schadstoffemissionen und die Minderung des Treibhausgasausstoßes auf Basis eines umgerüsteten Dieselmotors für den landwirtschaftlichen Einsatz. Ausgehend von der stöchiometrischen Energieumsetzung wird der Einfluss einer Ladungsverdünnung durch zusätzliche Verbrennungsluft und Abgasrückführung detailliert analysiert. Aus den Teilergebnissen wird ein Motorenkonzept abgeleitet, welches signifikante Vorteile gegenüber dem konventionellen Dieselmotor besitzt.
Progress on chiral symmetry breaking in a strong magnetic field
Creators: name: Wang, S. -Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The problem of chiral symmetry breaking in QED in a strong magnetic field is briefly reviewed. Recent progress on issues regarding the gauge fixing independence of the dynamically generated fermion mass is discussed.
description: 7 pages, to appear in the Proceedings of International Workshop on Origin of Mass and Strong Coupling Gauge Theories (SCGT 06), Nagoya, Japan, 21-24 November 2006
SU(4) chiral spin liquid, exciton supersolid and electric detection in moiré bilayers
Creators: name: Zhang, Ya-Hui
name: Sheng, D. N.
name: Vishwanath, Ashvin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose moiré bilayer as a platform where exotic quantum phases can be stabilized and electrically detected. Moiré bilayer consists of two separate moiré superlattice layers coupled through the inter-layer Coulomb repulsion. In the small distance limit, an SU(4) spin can be formed by combining layer pseudospin and the real spin. As a concrete example, we study an SU(4) spin model on triangular lattice in the fundamental representation. By tuning a three-site ring exchange term $K\sim \frac{t^3}{U^2}$, we find SU(4) symmetric crystallized phase and an SU(4)$_1$ chiral spin liquid (CSL) at the balanced filling. We also predict two different exciton supersolid phases with inter-layer coherence at imbalanced filling under displacement field. Especially, the system can simulate an SU(2) Bose-Einstein-condensation (BEC) by injecting inter-layer excitons into the magnetically ordered Mott insulator at the layer polarized limit. Smoking gun evidences of these phases can be obtained by measuring the pseudo-spin transport in the counter-flow channel.
description: 6+12 pages; 10 figures; v2: highlight experimental part; add calculation at imbalanced filling
The initial conditions of isolated star formation - VII. Spitzer mapping of pre-stellar cores
Creators: name: Kirk, J. M.
name: Ward-Thompson, D.
name: Andre, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have retrieved Spitzer archive data of pre-stellar cores taken with the Multiband Imaging Photometer for Spitzer (MIPS) at a wavelength of 160 um. Seventeen images, containing eighteen cores, were constructed. Flux densities were measured for each core, and background estimates were made. Mean off-source backgrounds were found to be 48\pm10 MJy/sr in Taurus and 140\pm55 MJy/sr in Ophiuchus. Consistency was found between the MIPS 170um and ISOPHOT 160um calibration. Fourteen cores were detected both by MIPS and our previous submillimetre surveys. Spectral Energy Distributions (SEDs) were made for each core, using additional 24- and 70-um data from the Spitzer data archive, as well as previous infra-red and submillimetre data. Previous temperature estimates were refined, and new temperature estimates were made where no Infrared Space Observatory (ISO) data exist. A temperature range of 8-18K was found for the cores, with most lying in the range 10-13K. We discount recent claims that a large number of pre-stellar cores may have been misclassified and in fact contain low luminosity protostars detectable only by Spitzer. We find no new protostars in our sample other than that previously reported in L1521F. It is shown that this has a negligible effect on pre-stellar lifetime estimates.
description: 13 pages, 6 figures, accepted for publication by MNRAS
Acoustic response of turbulent cavity flow using resolvent analysis
Creators: name: Liu, Qiong
name: Gaitonde, Datta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The decomposition of hydrodynamic and acoustic components of cavity flows can aid the understanding of the flow-acoustic interaction, which produces a variety of adverse effects in applications. We apply the approach of combining the resolvent analysis and Doak's momentum potential theory to examine the input-output flow-acoustic characteristics of compressible flow over an open cavity at Re=10,000. The methodology can decompose hydrodynamic and acoustic components from an input-output framework. We further localize the forcing at the leading-edge and front wall of the cavity and filter with a single component of velocity, density, and temperature forcing. For the subsonic flow at M=0.6, The strong acoustic component appears at the trailing edge of the cavity at a lower frequency. while as the frequency increases, the intense acoustic structure moves close to upstream and overlap with the hydrodynamic component. This tendency is also observed in the supersonic flow condition M=1.4. Compared to different types of forcing, the streamwise velocity forcing achieves the largest energy amplification. However, it substantially reduces by moving the forcing location from the leading-edge to the front wall of the cavity. This work provides an alternative approach to examine input-output flow-acoustic characteristics where resonance is dominant and provides guidance for the development of flow control strategies.
description: 21 pages, 15 figures
Predicting Vulnerability of Medicinal Plants Used by Karen People in Chiang Mai Province to Climatic Change
Creators: name: Kornkanok Tangjitman
name: Chalobol Wongsawad
name: Chusie Trisonthi
Publisher: name: Faculty of Environment and Resourdce Studies,Mahidol University
Year: 2015
Subjects: diversity loss,extinction,conservationethno botany /Maxent

description: 1, 13, Environment and Natural Resources Journal
The age and colors of massive white dwarf stars
Creators: name: Althaus, L. G.
name: García-Berro, E.
name: Isern, J.
name: Córsico, A. H.
name: Rohrmann, R. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present evolutionary calculations and colors for massive white dwarfs with oxygen-neon cores for masses between 1.06 and 1.28 Mo. The evolutionary stages computed cover the luminosity range from log(L/Lo) approx. 0.5 down to -5.2. Our cooling sequences are based on evolutionary calculations that take into account the chemical composition expected from massive white dwarf progenitors that burned carbon in partially degenerate conditions. The use of detailed non-gray model atmospheres provides us with accurate outer boundary conditions for our evolving models at low effective temperatures. We examine the cooling age, colors and magnitudes of our sequences. We find that massive white dwarfs are characterized by very short ages to such an extent that they reach the turn-off in their colors and become blue at ages well below 10 Gyr. Extensive tabulations for massive white dwarfs, accessible from our web site, are also presented.
description: 10 pages, including 1 table and 10 figures. To be published in Astronomy & Astrophysics
29 W High Power CW Supercontinuum Source
Creators: name: Cumberland, B. A.
name: Travers, J. C.
name: Popov, S. V.
name: Taylor, J. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A 29 W CW supercontinuum spanning from 1.06 to 1.67 um is generated in a short length of PCF with two zero dispersion wavelengths. The continuum has the highest spectral power density, greater than 50 mW/nm up to 1.4 um, reported to date. The use of a short length of PCF enables the continuum to expand beyond the water loss at 1.4 um. The dynamics of the continuum evolution are studied experimentally and numerically with close attention given to the effects of the water loss and the second zero dispersion wavelength.
description: 11 pages, 12 figures
Quantum Degenerate Exciton-Polaritons in Thermal Equilibrium
Creators: name: Deng, H
name: Press, D
name: Gotzinger, S
name: Solomon, GS
name: Hey, R
name: Ploog, KH
name: Yamamoto, Y
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the momentum distribution and relaxation dynamics of semiconductor microcavity polaritons by angle-resolved and time-resolved spectroscopy. Above a critical pump level, the thermalization time of polaritons at positive detunings becomes shorter than their lifetime, and the polaritons form a quantum degenerate Bose-Einstein distribution in thermal equilibrium with the lattice.
description: Updated with the published version
Group theoretical derivation of consistent massless particle theories
Creators: name: Nisticò, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Current theories of massless free particle assume {\sl unitary} space inversion and {\sl anti-unitary} time reversal operators. In so doing robust classes of possible theories are discarded. In the present work theories of massless systems are derived through a strictly deductive development from the principle of relativistic invariance, so that a kind of space inversion or time reversal operator is ruled out only if it causes inconsistencies. As results, new classes of consistent theories for massless isolated systems are explicitly determined. On the other hand, the approach determines definite constraints implied by the invariance principle; they were ignored by some past investigations that, as a consequence, turn out to be not consistent with the invariance principle. Also the problem of the localizability for massless systems is reconsidered within the new theoretical framework, obtaining a generalization and a deeper detailing of previous results.
description: 22 pages
Nonlinear optical response of resonantly driven polaron-polaritons
Creators: name: Julku, Aleksi
name: Bastarrachea-Magnani, Miguel. A.
name: Camacho-Guardian, Arturo
name: Bruun, Georg M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Exciton polaritons in two-dimensional semiconductors inside microcavities are powerful platforms to explore hybrid light-matter quantum systems. Here, we study a macroscopic coherent population of the lowest energy state of polaron-polaritons, which are quasiparticles formed by the dressing of exciton polaritons by particle-hole excitations in a surrounding electron gas. Using a non-perturbative many-body theory to describe exciton-electron correlations combined with a non-equilibrium theory for the macroscopically populated state, we show that the electrons strongly affect the collective properties of the polaron-polaritons. This stems from the dependence of the polaron-polariton energy and the interaction between them on the electron density, which leads to strong nonlinearities. We identify stable and unstable regimes of the polaron-polaritons by calculating its excitation spectrum, and show that they result in prominent hysteresis effects when the electron density is varied. Our results should be readily observable using present experimental technology.
A Deodhar type stratification on the double flag variety
Creators: name: Webster, Ben
name: Yakimov, Milen
Publisher: name: arXiv
Year: 2006
Subjects: subject: Symplectic Geometry (math.SG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M15

description: We describe a stratification on the double flag variety $G/B^+\times G/B^-$ of a complex semisimple algebraic group $G$ analogous to the Deodhar stratification on the flag variety $G/B^+$, which is a refinement of the stratification into orbits both for $B^+\times B^-$ and for the diagonal action of $G$, just as Deodhar's stratification refines the orbits of $B^+$ and $B^-$. We give a coordinate system on each stratum, and show that all strata are coisotropic subvarieties. Also, we discuss possible connections to the positive and cluster geometry of $G/B^+\times G/B^-$, which would generalize results of Fomin and Zelevinsky on double Bruhat cells and Marsh and Rietsch on double Schubert cells.
description: 21 pages
On the parallel implementation of OSI protocol processing systems
Creators: name: Lam, Robert
Publisher: name: University of British Columbia
Year: 2008

description: In a heterogeneous computing environment, computers have to use a suitable transfer syntax to communicate with each other because of the differences in data representations in each computer. The need to translate the data from one format to another, which can be under-stood by all computers, takes over 90% of the processing power used for protocol processings. Application specific architectures in a heterogeneous system may not be efficient in performing protocol processing functions and there is a need for a stand alone protocol processing system. In a gigabit networking environment, the processing power required for protocol processing is beyond that of a single processor and a multiprocessor approach is needed. Three different multiprocessor architectures with increasing complexities for protocol processing are described in this thesis. These designs make use of the properties of locality of processing and prefetching techniques. Both simulations and analytical methods are used to evaluate the performance. The results indicated that by putting instructions and packet data close to the processors, a significant increase in processing throughput can be obtained as compared to previously published designs. In our best scenario, we obtained a throughput of up to560MBits/s. With further optimizations, it is expected that the throughput can be extended to a gigabit rate. The study also revealed that a bus based architecture is sufficient in handling the OSI protocol processing requirement for a network rate of over 560MBits/s. It was observed that the use of fast processors alone without matching fast memory is inadequate in providing a feasible solution. The sequential nature of protocol definition could be changed to include more parallelism and to further improve the scalability of the protocol processing system.
A snapshot of the inner dusty regions of a RCrB-type variable
Creators: name: Leao, I. C.
name: De Laverny, Patrick
name: Chesneau, O.
name: Mekarnia, D.
name: De Medeiros, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: R Coronae Borealis variable stars are suspected to sporadically eject optically thick dust clouds causing, when one of them lies on the line-of-sight, a huge brightness decline in visible light. Mid-infrared interferometric observations of RYSgr allowed us to explore the circumstellar regions very close to the central star (~20-40 mas) in order to look for the signature of any heterogeneities. Using the VLTI/MIDI instrument, five dispersed visibility curves were recorded with different projected baselines oriented towards two roughly perpendicular directions. The large spatial frequencies visibility curves exhibit a sinusoidal shape whereas, at shorter spatial frequencies visibility curves follow a Gaussian decrease. These observations are well interpreted with a geometrical model consisting in a central star surrounded by an extended circumstellar envelope in which one bright cloud is embedded. Within this simple geometrical scheme, the inner 110AU dusty environment of RYSgr is dominated at the time of observations by a single dusty cloud which, at 10mic represents ~10% of the total flux of the whole system. The cloud is located at about 100stellar radii from the centre toward the East-North-East direction (or the symmetric direction with respect to centre) within a circumstellar envelope which FWHM is about 120stellar radii. This first detection of a cloud so close to the central star, supports the classical scenario of the RCrB brightness variations in the optical spectral domain.
Generating high density molecular jets of complex neutral organic molecules using micro-sized Tesla valves
Creators: name: Shaikh, Moniruzzaman
name: Liu, Xinyao
name: Amini, Kasra
name: Steinle, Tobias
name: Biegert, Jens
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report the design and implementation of multiple Tesla type micro valves in the target delivery system of a reaction microscope (ReMi) to study gas phase structural dynamics of complex polyatomic molecules, when no delivery system currently exists that can deliver dense enough molecular jets of neutral complex molecules without ionizing or exciting the target. We show, the Tesla valves provide an efficient unidirectional flow of the cis-stilbene molecules into the ReMi. We demonstrate using a bubbler with Tesla valves an order-of-magnitude increase in the detected stilbene molecular ion signal following the strong-field tunnel ionization (SFTI), compared to conventional bubbler without any Tesla valves. Our results for the first time, opens the door for studying large, complex neutral molecules in the gas-phase with low vapour pressures in future ultrafast studies.
The high-mass stellar IMF in different environments
Creators: name: Kroupa, Pavel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The massive-star IMF is found to be invariable. However, integrated IMFs probably depend on galactic mass.
description: Invited talk at JD05, IAU General Assembly XVI, Prague
Spectral Statistics of Non-Hermitian Matrices and Dissipative Quantum Chaos
Creators: name: Li, Jiachen
name: Prosen, Tomaž
name: Chan, Amos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a measure, which we call the dissipative spectral form factor (DSFF), to characterize the spectral statistics of non-Hermitian (and non-Unitary) matrices. We show that DSFF successfully diagnoses dissipative quantum chaos, and reveals correlations between real and imaginary parts of the complex eigenvalues up to arbitrary energy (and time) scale. Specifically, we provide the exact solution of DSFF for the GinUE and for a Poissonian random spectrum (Poisson) as minimal models of dissipative quantum chaotic and integrable systems respectively. For dissipative quantum chaotic systems, we show that DSFF exhibits an exact rotational symmetry in its complex time argument $τ$. Analogous to the spectral form factor (SFF) behaviour for GUE, DSFF for GinUE shows a ``dip-ramp-plateau'' behavior in $|τ|$: DSFF initially decreases, increases at intermediate time scales, and saturates after a generalized Heisenberg time which scales as the inverse mean level spacing. Remarkably, for large matrix size, the ``ramp'' of DSFF for GinUE increases quadratically in $|τ|$, in contrast to the linear ramp in SFF for Hermitian ensembles. For dissipative quantum integrable systems, we show that DSFF takes a constant value except for a region in complex time whose size and behavior depends on the eigenvalue density. Numerically, we verify the above claims and show that DSFF for real and quaternion real Ginibre ensembles coincides with the GinUE behaviour except for a region in complex time plane of measure zero in the limit of large matrix size. As a physical example, we consider the quantum kicked top model with dissipation, and show that it falls under the Ginibre universality class and Poisson as the `kick' is switched on or off. Lastly, we study spectral statistics of ensembles of random classical stochastic matrices, and show that these models fall under the Ginibre universality class.
description: 8+12 pages, 3+50 figures. To appear in PRL. v2: Added appendices E,F and G
Search for the θ_{13} Neutrino Mixing Angle Using Reactor Anti-Neutrinos
Creators: name: Motta, Dario
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The measurement of the last undetermined neutrino mixing angle θ_{13} is the main goal of the future experimental research on neutrino oscillations. At present, θ_{13} is only known to be much smaller than the two other mixing angles, θ_{12} and θ_{23}. The present bound, which is dominated by the result of the CHOOZ reactor experiment, is \sin^{2}2θ_{13}<0.08 (at 90 % confidence level). However, it is widely recognized that the potential of reactor anti-neutrino disappearance experiments has not been fully exploited yet. A rich experimental program is underway, which aims at exploring in the near future up to \sin^{2}2θ_{13}\lesssim0.01. The targeted sensitivity requires a clear-cut strategy to reduce significantly both statistical and systematical errors with respect to past reactor experiments. A key feature for the success of all projects is the installation of one or more near identical detectors. The experimental concept and the status of the upcoming or proposed reactor experiments, and as well the prospects of the reactor-based search for θ_{13} are reviewed.
description: 12 pages, 4 figures, 4 tables. Presented at the "6th Rencontres du Vietnam" conference (http://vietnam.in2p3.fr/2006/)
Nonexponential decay of Bose-Einstein condensates: a numerical study based on the complex scaling method
Creators: name: Schlagheck, Peter
name: Wimberger, Sandro
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the decay dynamics of an interacting Bose-Einstein condensate in the presence of a metastable trapping potential from which the condensate can escape via tunneling through finite barriers. The time-dependent decay process is reproduced by means of the instantaneous decay rates of the condensate at a given population of the quasi-bound state, which are calculated with the method of complex scaling. Both for the case of a double barrier potential as well as for the case of a tilted periodic potential, we find pronounced deviations from a monoexponential decay behaviour which would generally be expected in the absence of the atom-atom interaction.
description: 7 pages, 2 figures
MMSE Optimal Algebraic Space-Time Codes
Creators: name: Rajan, G. Susinder
name: Rajan, B. Sundar
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Design of Space-Time Block Codes (STBCs) for Maximum Likelihood (ML) reception has been predominantly the main focus of researchers. However, the ML decoding complexity of STBCs becomes prohibitive large as the number of transmit and receive antennas increase. Hence it is natural to resort to a suboptimal reception technique like linear Minimum Mean Squared Error (MMSE) receiver. Barbarossa et al and Liu et al have independently derived necessary and sufficient conditions for a full rate linear STBC to be MMSE optimal, i.e achieve least Symbol Error Rate (SER). Motivated by this problem, certain existing high rate STBC constructions from crossed product algebras are identified to be MMSE optimal. Also, it is shown that a certain class of codes from cyclic division algebras which are special cases of crossed product algebras are MMSE optimal. Hence, these STBCs achieve least SER when MMSE reception is employed and are fully diverse when ML reception is employed.
description: 5 pages, 1 figure, journal version to appear in IEEE Transactions on Wireless Communications. Conference version appeared in NCC 2007, IIT Kanpur, India
{PQCD analysis of exclusive $e^+e^-\to D_{[s]}^+D_{[s]}^-$ cross section at $\sqrt{s}=10.6$ GeV
Creators: name: Choi, Ho-Meoyng
name: Ji, Cheung-Ryong
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the exclusive pseudoscalar $D_{[s]}^+D_{[s]}^-$ pair production in $e^+e^-$ annihilations at $\sqrt{s}=10.6$ GeV using a non-factorized PQCD with the light-front wave function that goes beyond the peaking approximation. We compare our non-factorized analysis with the usual factorized analysis based on the peaking approximation in the calculation of the cross section for the heavy meson pair production. We also discuss the higher helicity contribution to the cross section. Our analysis provides a constraint on the size of quark transverse momentum inside the $D$ meson from the recent Belle data, $σ_{\rm Exp.}(e^+e^-\to D^+D^-)<0.04$.
description: 12pages, 7figures
Hyper-domains in exchange bias micro-stripe pattern
Creators: name: Theis-Broehl, K.
name: Westphalen, A.
name: Zabel, H.
name: Ruecker, U.
name: McCord, J.
name: Hoeink, V.
name: Schmalhorst, J.
name: Reiss, G.
name: Weis, T.
name: Engel, D.
name: Ehresmann, A.
name: Toperverg, B. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: A combination of experimental techniques, e.g. vector-MOKE magnetometry, Kerr microscopy and polarized neutron reflectometry, was applied to study the field induced evolution of the magnetization distribution over a periodic pattern of alternating exchange bias stripes. The lateral structure is imprinted into a continuous ferromagnetic/antiferromagnetic exchange-bias bi-layer via laterally selective exposure to He-ion irradiation in an applied field. This creates an alternating frozen-in interfacial exchange bias field competing with the external field in the course of the re-magnetization. It was found that in a magnetic field applied at an angle with respect to the exchange bias axis parallel to the stripes the re-magnetization process proceeds via a variety of different stages. They include coherent rotation of magnetization towards the exchange bias axis, precipitation of small random (ripple) domains, formation of a stripe-like alternation of the magnetization, and development of a state in which the magnetization forms large hyper-domains comprising a number of stripes. Each of those magnetic states is quantitatively characterized via the comprehensive analysis of data on specular and off-specular polarized neutron reflectivity. The results are discussed within a phenomenological model containing a few parameters which can readily be controlled by designing systems with a desired configuration of magnetic moments of micro- and nano-elements.
description: 11 pages, 7 figures
Accelerating Universes from Compactification on a Warped Conifold
Creators: name: Neupane, Ishwaree P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We find a cosmological solution corresponding to compactification of 10d supergravity on a warped conifold that easily circumvents `no-go' theorem given for a warped/flux compactification, providing new perspectives for the study of supergravity or superstring theory in cosmological backgrounds. With fixed volume moduli of the internal space, the model can explain a physical universe undergoing an accelerated expansion in the 4d Einstein frame, for a sufficiently long time. The solution found in the limit that the warp factor dependent on the radial coordinate $y$ is extremized (giving a constant warping) is smooth and it supports a flat four-dimensional Friedmann-Robertson-Walker cosmology undergoing a period of accelerated expansion with slowly rolling or stabilized volume moduli.
description: 4 revtex pages; clarifications and references added; version accepted for publication in PRL
D3.3 – Annual Report from TheFSM Software Components Integration and Testing
Creators: name: Vergeti, Danai
name: Ntalaperas, Dimitris
name: Angelidis, Iosif
Publisher: name: Zenodo
Year: 2022
Subjects: food safety
big data
standards
certification

description: In the current document we present the integration strategy of TheFSM Platform which includes the development, testing and deployment strategy for TheFSM technical solution. We focus on the methodology on both component and platform level. Unit testing is utilized to automate testing as much as possible, while we carefully follow well-established industry standards and methodologies in our approach. We provide examples of unit tests which test the internal functionality of components and their compliance with the specifications. Additionally, integration tests are provisioned in order to assure the interoperability between components. As more use cases are covered by the platform, these tests will evolve, adapt and carefully cover the newly added functionality. Moreover, we describe issue tracking and the dockerization process we follow during development. The current document provides a) the approach we follow in development regarding both the overall project and within component level, b) the technical verification of our pipeline. We define how verification is guaranteed via unit and integration testing, thoroughly describing the unit testing process and c) the technical evaluation, where we define metrics and KPIs relevant to the project and we provide analytical tables which include our performance against the relevant metrics.
Οι ασφαλιστικές εισφορές των αυτοαπασχολουμένων
Creators: name: Μπλαχάβα, Δέσποινα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ασφαλιστικές εισφορές
Αυτοαπασχολούμενοι
Αρχή ισότητας
Social security contributions
Self employed
Principle of equality

description: Αντικείμενο της εργασίας αποτελεί το σύστημα ασφαλιστικών εισφορών των αυτοαπασχολούμενων. Ο ν. 4387/2016, που θεσπίστηκε σε συμμόρφωση με το τρίτο μνημόνιο, επέφερε ριζική αλλαγή στο σύστημα υπολογισμού των ασφαλιστικών εισφορών των αυτοαπασχολουμένων, ορίζοντας, κατα κύριο λόγο, ως βάση υπολογισμού αυτών το πραγματικό εισόδημα των ασφαλισμένων. Αναφορικά με τις ρυθμίσεις του νόμου αυτού εγέρθησαν ζητήματα τόσο σε επίπεδο πρακτικής εφαρμογής των διατάξεων, όσο και σε επίπεδο συμβατότητας τους με συνταγματικά κατοχυρωμένα δικαιώματα και αρχές. Το συμβούλιο της επικρατείας απεφάνθη περί της αντισυνταγματικότητας των διατάξεων του ν. 4387/2016 για τις ασφαλιστικές εισφορές των αυτοαπασχολουμένων, καθώς έκρινε ότι οι διατάξεις αυτές οδηγούν σε δυσμενή μεταχειρίση των αυτοαπασχολουμένων σε σχέση με τους μισθωτούς, ώστε αντίκεινται στη γενική αρχή της ισότητας. Τέλος, στην εργασία παρατίθενται οι σχετικές κρίσεις του δικαστηρίου, αναλύονται οι δυνατοί τρόποι συμμόρφωσης της νομοθεσίας με τις εκδοθείσες δικαστικές αποφάσεις και γίνεται κριτική του σύστηματος υπολογισμού των ασφαλιστικών εισφορών των αυτοαπασχολουμένων που αναμένεται να επιλέξει ο νομοθέτης
description: Τhe scope of this dissertation is the social security contribution system for self-employed. Law 4387/2016 that has been introduced in compliance with the Third Economic Adjustment Program has radically changed the system for the calculation of the social security contributions of self-employed by mainly setting the actual income of the insured person as the basis for the said calculation. Many questions have been raised with regard to the provisions of the said law not only as to the implementation thereof but also to their compliance with the constitutional rights and principles. The Council of the State ruled on the unconstitutionality of the provisions of Law 4387/2016 on the social security contributions of self-employed as it held that these provisions result in an adverse treatment of self-employed in relation to remunerated employees and so they violate the general principle of equality. Finally, the dissertation presents the relevant judgment of the court, analyses the possible options for the legislator to comply with the adopted court decisions and criticizes the system for the calculation of the social security contributions of self-employed that the
On the Explanatory Limits of Concepts and Causes: Intentionality, Biology, and the Space of Reasons
Creators: name: Atytalla, John
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2019
Subjects: Epistemology
Philosophy of Mind
Philosophy of Biology
Intentionality

description: In Mind and World John McDowell argues that our attempts to understand how it is that our thoughts are rationally answerable to the world are in vain. Whether one takes Cognitive Science, Evolutionary Psychology or Phenomenology to be capable of answering this question, such attempts are, he claims, merely a consequence of failing to see that they are already gripped by a picture of the world which precludes the possibility of such answers. In particular, he suggests that if we render Nature as that which is circumscribed by the intelligibility of the natural sciences, we leave no room for rationality conceived of in terms of the spontaneity and freedom that Kant associated with it. While McDowell claims to be a `quietist' who is not putting forward his own theory of mind, he is, at the very least, suggesting a theory of nature, one which he dubs `liberal' insofar as it suggests that we widen the scope of nature so that it can be hospitable to the normative features of thought. This thesis will propose a theory of mind which attempts to show how the causal, normative, and phenomenological can be seen as continuous features of the natural world. It demonstrates that a careful appraisal of causal or scientific accounts of intentionality can be made compatible with McDowell's commitment to the normativity of thought. By revealing that a biological account of the mind, suitably expanded to include an account of history as a Dynamic Ecological Milieu, generates biological interrogatives for the human organism, we can show that the normative manifests as an emergent property of the nomological. This allows second nature to retain its sui generis status while being continuous with the causal descriptions of first nature. This thesis will also draw from the Phenomenological tradition, as a means of critiquing McDowell's account of “the Myth of the Given" and his rejection of pre-conceptual content. In particular, it will follow Charles Taylor and Hubert Dreyfus in affirming that we should view experience, not in terms of that which provides epistemic foundations, but as the domain of pre-reflective embodiment. This is essential to showing how the biological sciences can inform us about the causal background which makes embodied coping so unreflectively natural. Furthermore, phenomenology has provided a means of engaging with the biological sciences in a non-reductive way, as is evidenced by Maurice Merleau-Ponty's The Structure of Behavior and the more recent neurophenomenological tradition which is largely inspired by his work. Finally, by drawing on these resources, the desideratum of this thesis is a scientifically informed understanding of what McDowell calls “second nature" and “the space of reasons" in terms of what I have called “biological interrogatives" and the “phenomenology of epistemic agency".