cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution
Creators: name: Schlaufman, Kevin C.
name: Halpern, Noah D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Since planet occurrence and primordial atmospheric retention probability increase with period, the occurrence-weighted median planets discovered by transit surveys may bear little resemblance to the low-occurrence, short-period planets sculpted by atmospheric escape ordinarily used to calibrate mass--radius relations and planet formation models. An occurrence-weighted mass--radius relation for the low-mass planets discovered so far by transit surveys orbiting solar-type stars requires both occurrence-weighted median Earth-mass and Neptune-mass planets to have a few percent of their masses in hydrogen/helium (H/He) atmospheres. Unlike the Earth that finished forming long after the protosolar nebula was dissipated, these occurrence-weighted median Earth-mass planets must have formed early in their systems' histories. The existence of significant H/He atmospheres around Earth-mass planets confirms an important prediction of the core-accretion model of planet formation. It also implies core masses $M_{\text{c}}$ in the range $2~M_{\oplus}\lesssim M_{\text{c}}\lesssim 8~M_{\oplus}$ that can retain their primordial atmospheres. If atmospheric escape is driven by photoevaporation due to extreme ultraviolet (EUV) flux, then our observation requires a reduction in the fraction of incident EUV flux converted into work usually assumed in photoevaporation models. If atmospheric escape is core driven, then the occurrence-weighted median Earth-mass planets must have large Bond albedos. In contrast to Uranus and Neptune that have at least 10% of their masses in H/He atmospheres, these occurrence-weighted median Neptune-mass planets are H/He poor. The implication is that they experienced collisions or formed in much shorter-lived and/or hotter parts of their parent protoplanetary disks than Uranus and Neptune's formation location in the protosolar nebula.
description: 23 pages, 7 figures, and 1 table in aastex631 format; accepted for publication in ApJ
Properties of generalized univariate hypergeometric functions
Creators: name: van de Bult, Fokko J.
name: Rains, Eric M.
name: Stokman, Jasper V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: Based on Spiridonov's analysis of elliptic generalizations of the Gauss hypergeometric function, we develop a common framework for 7-parameter families of generalized elliptic, hyperbolic and trigonometric univariate hypergeometric functions. In each case we derive the symmetries of the generalized hypergeometric function under the Weyl group of type E_7 (elliptic, hyperbolic) and of type E_6 (trigonometric) using the appropriate versions of the Nassrallah-Rahman beta integral, and we derive contiguous relations using fundamental addition formulas for theta and sine functions. The top level degenerations of the hyperbolic and trigonometric hypergeometric functions are identified with Ruijsenaars' relativistic hypergeometric function and the Askey-Wilson function, respectively. We show that the degeneration process yields various new and known identities for hyperbolic and trigonometric special functions. We also describe an intimate connection between the hyperbolic and trigonometric theory, which yields an expression of the hyperbolic hypergeometric function as an explicit bilinear sum in trigonometric hypergeometric functions.
description: 46 pages
On scattering of solitons for the Klein-Gordon equation coupled to a particle
Creators: name: Imaikin, V.
name: Komech, A.
name: Vainberg, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37K; 35B41; 35L; 35Q; 35P25

description: We establish the long time soliton asymptotics for the translation invariant nonlinear system consisting of the Klein-Gordon equation coupled to a charged relativistic particle. The coupled system has a six dimensional invariant manifold of the soliton solutions. We show that in the large time approximation any finite energy solution, with the initial state close to the solitary manifold, is a sum of a soliton and a dispersive wave which is a solution of the free Klein-Gordon equation. It is assumed that the charge density satisfies the Wiener condition which is a version of the ``Fermi Golden Rule''. The proof is based on an extension of the general strategy introduced by Soffer and Weinstein, Buslaev and Perelman, and others: symplectic projection in Hilbert space onto the solitary manifold, modulation equations for the parameters of the projection, and decay of the transversal component.
description: 47 pages, 2 figures
Thesis and antithesis—Innovation and predictive analytics: Σ (Past+ Present) Data≠ Future Success
Creators: name: Gross, Ted
Publisher: name: figshare
Year: 2021
Subjects: subject: 80611 Information Systems Theory
subject: FOS: Computer and information sciences
subject: 80608 Information Systems Development Methodologies
subject: Information Systems

description: Abstract:
Predictive analytics (PA) is a tool routinely used by companies to help chart a future product path. It makes extensive use of algorithms and data mining to sort out market desires and trends.
It also combines a robust host of artificial intelligence tools, including machine learning, pattern recognition, natural language processing, sentiment analysis and emotion recognition, among others, to achieve more precise results. PA, though, is imperfect, as it is often subject to the whims of the marketplace. Analysing past and present data does not, in any manner, guarantee positive results. Indeed, when it comes to innovation, particularly ‘disruptive innovation’, relying on PA can lead a company down a disastrous path.
Data analytics requires a method that validates innovation and uses PA as something other than an infallible crystal ball. But does the possibility of innovation automatically disavow any insights into future market trends that PA may supply?
This paper attempts to place both innovation and PA into proper perspective. It considers when, where, how and why PA and innovation are paramount, but reiterates the importance of instinct, originality and creativity. To illustrate its argument, the paper draws on the history of the Sony Walkman and Apple iPod.
Exact low temperature results for transport properties of the interacting resonant level model
Creators: name: Boulat, E.
name: Saleur, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using conformal field theory and integrability ideas, we give a full characterization of the low temperature regime of the anisotropic interacting resonant level (IRLM) model. We determine the low temperature corrections to the linear conductance exactly up to the 6th order. We show that the structure displays 'Coulomb deblocking' at resonance, i.e., a strong impurity-wire capacitive coupling enhances the conductance at low temperature.
description: 4 pages, 2 figures
HST PanCET program: Non-detection of atmospheric escape in the warm Saturn-sized planet WASP-29 b
Creators: name: Santos, L. A. dos
name: Bourrier, V.
name: Ehrenreich, D.
name: Sanz-Forcada, J.
name: López-Morales, M.
name: Sing, D. K.
name: Muñoz, A. García
name: Henry, G. W.
name: Lavvas, P.
name: Etangs, A. Lecavelier des
name: Mikal-Evans, T.
name: Vidal-Madjar, A.
name: Wakeford, H. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: (Abridged) Short-period gas giant exoplanets are susceptible to intense atmospheric escape due to their large scale heights and strong high-energy irradiation. This process is thought to occur ubiquitously, but to date we have only detected direct evidence of atmospheric escape in hot Jupiters and warm Neptunes. The paucity of cases for intermediate, Saturn-sized exoplanets at varying levels of irradiation precludes a detailed understanding of the underlying physics in atmospheric escape of hot gas giants. Our objectives here are to assess the high-energy environment of the warm ($T_\mathrm{eq} = 970$ K) Saturn WASP-29 b and search for signatures of atmospheric escape. We used far-ultraviolet (FUV) observations from the Hubble Space Telescope to analyze the flux time series of H I, C II, Si III, Si IV, and N V during the transit of WASP-29 b. At 3$σ$ confidence, we rule out any in-transit absorption of H Ilarger than 92% in the Lyman-$α$ blue wing and 19% in the red wing. We found an in-transit flux decrease of $39\%^{+12\%}_{-11\%}$ in the ground-state C II emission line at 133.45 nm. But due to this signal being significantly present in only one visit, it is difficult to attribute a planetary or stellar origin for the ground-state C II signal. We place 3$σ$ absorption upper limits of 40%, 49% and 24% for Si III, Si IV, and for excited-state C II at 133.57 nm, respectively. Low activity levels and the faint X-ray luminosity suggest that WASP-29 is an old, inactive star. An energy-limited approximation combined with the reconstructed EUV spectrum of the host suggests that the planet is losing its atmosphere at a rate of $4 \times 10^9$ g s$^{-1}$. The non-detection at Lyman-$α$ could be partly explained by a low fraction of escaping neutral hydrogen, or by the state of fast radiative blow-out we infer from the reconstructed stellar Lyman-$α$ line.
description: 10 pages, 8 figures, accepted for publication in Astronomy & Astrophysics. v2 with a few text changes for consistency
Dynamics and structure of interfacial crack fronts
Creators: name: Maloy, Knut Jorgen
name: Toussaint, Renaud
name: Schmittbuhl, Jean
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The propagation of an interfacial crack front through a weak plane of a transparent Plexiglas block has been studied experimentally. A stable crack in mode I was generated by loading the system by an imposed displacement. The local velocities of the fracture front line have been measured by using an high speed CCD camera. The distribution of the velocities exhibits a power law behavior for velocities larger than the average front velocity with a crossover to a slowly increasing function for velocities lower than . The fluctuations in the velocities reflect an underlying irregular bursts activity with a power law distribution of the bursts. We further found that the size of the local bursts scales differently in the direction parallel to and perpendicular to the fracture front.
Υγροχρωματογραφικός προσδιορισμός των καταλοίπων της υδροχλωρικής σαραφλοξακίνης μετά από χορήγηση αυτής με την τροφή σε εκτρεφόμενες τσιπούρες
Creators: name: Τυρπένου, Αθανάσιος Ε.
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Σαραφλοξακίνη
Κατάλοιπα
Residues

description: Με την έρευνα αυτή κατέστη δυνατή η τυποποίηση και τεκμηρίωση αναλυτικής μεθόδου για την αξιόπιστη ανίχνευση, ταυτοποίηση και ποσοτικό προσδιορισμό των καταλοίπων της υδροχλωρικής σαραφλοξακίνης στη σάρκα, ήπαρ, νεφρούς και οστά της τσιπούρας εκτροφής. Εγιναν τρείς βιολογικοί πειραματισμοί με χορήγηση του φαρμάκου σε τσιπούρες και αναλύθηκαν τα δείγματα με σκοπό τον προσδιορισμό της απομάκρυνσης των καταλοίπων ώστε το τελικό προϊόν να είναι απαλλαγμένο και ασφαλές από κατάλοιπα για τον καταναλωτή. Διαπιστώθηκε ότι η σαραφλοξακίνη κατανέμεται σε όλους τους ιστούς και αποβάλλεται τάχιστα, φθάνοντας σε επίπεδα πολύ πιό κάτω από το MRL=30mg/kg εντός 48 ωρών μετά την τελευταία δόση. Τέλος υπολογίσθηκε στατιστικά ο χρόνος απομάκρυνσης της σαραφλοξακίνης από τη σάρκα της εκτρεφόμενης τσιπούρας ο οποίος είναι 42,2 ώρες.
description: In this study, a new HDIC method was development for the reliable identification, confirmation and quantification of serafloxacin residues in musele plus skin, liver, kidney and vertebra of gilthead seabream(sparus aurata L.) Three(3) biological trials have been organized and sarafloxacin has been administered in feed and fed to fish.Residues were determined in order the final product should be safe for the consumers. It was found that sarafloxacin is well and differentially distributed in seabrean and residues were depleted rapidly and fall below the MRL=30μg/kg in 48 hours ofter the last closing day. Also, finally, a withdrawal period from musele plus skin of the farmed gilthead seabream was calculated and it was found to be 42,2 hours
description: Τομέας Υγιεινής και Τεχνολογίας Τροφίμων Ζωϊκής Προελέυσεως.
Λέιζερ στενών παλμών στο υπεριώδες
Creators: name: Ζήγκος, Δημήτριος Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Εγκλείδωση φάσεων-εγκλείδωση ιδιοσυχνοτήτων
Κορέσιμος απορροφητής
Βραχείς παλμοί
Ευρείς παλμοί-παλμοί μεγάλης διάρκειας
Λέιζερ διηγερμένων διμερών
Αντληση
Mode-locking
Excimer laser-excimer
Dissociation-HgBr
Saturable absorber
Short pulse
Long pulse

description: Κατασκευή και μελέτη ενός λέιζερ ικανού να παρέχει παλμούς με διάρκειες που κυμαίνονται από μερικές εκατοντάδες έως μερικές δεκάδες ps. Η διάταξη όφειλε να παραμείνει διπλή. Η τεχνική που επιλέχθηκε ήταν η εγκλείδωση των φάσεων των ιδιοσυχνοτήτων της κοιλότητας του λέιζερ (mode-locking) και μάλιστα στην παθητική μορφή. Οι κορέσιμοι απορροφητές ήταν είτε υγρής είτε αέριας κατάστασης. Μελετήθηκε εκτενώς αέριος κορέσιμος απορροφητής (HgBr), ο οποίος θεωρείται ότι μπορεί να προσομοιάσει καλύτερα τον ιδανικό κορέσιμο απορροφητή.
description: Investigation of Passive Mode Locking by using a gaseons saturable absorber. HgBr2 specifically, was investigated due to its ability to absorb 308 nm (with 2-photon ionization) and to be dissociated to HgBr molecule. it has been proven that it behaves like a good saturable absorber.
Comments on differential cross section of phi-meson photoproduction at threshold
Creators: name: Titov, A. I.
name: Nakano, T.
name: Daté, S.
name: Ohashi, Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the differential cross section d_sigma/d_t of gamma p --> ϕp reaction at the threshold is finite and its value is crucial to the mechanism of the phi meson photoproduction and for the models of phi-N interaction.
description: 8 pages, 2 figures
Debye model for the surface phonons
Creators: name: Poluektov, Yu. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A quantum description of the surface waves in an isotropic elastic body without the use of the semiclassical quantization is proposed. The problem about the surface waves is formulated in the Lagrangian and Hamiltonian representations. Within the framework of the generalized Debye model, the contribution of the surface phonons (rayleighons) to thermodynamic functions is calculated. It is emphasized that the role of the surface phonons can be significant and even decisive in low-dimensional systems, granular and porous media, and that their contribution to the total heat capacity increases with decreasing temperature.
description: 10 pages
Hidden symmetry of hyperbolic monopole motion
Creators: name: Gibbons, G. W.
name: Warnick, C. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Hyperbolic monopole motion is studied for well separated monopoles. It is shown that the motion of a hyperbolic monopole in the presence of one or more fixed monopoles is equivalent to geodesic motion on a particular submanifold of the full moduli space. The metric on this submanifold is found to be a generalisation of the multi-centre Taub-NUT metric introduced by LeBrun. The one centre case is analysed in detail as a special case of a class of systems admitting a conserved Runge-Lenz vector. The two centre problem is also considered. An integrable classical string motion is exhibited.
description: 39 pages, 7 figures, references added, minor changes to section 2
Τεχνικές εξόρυξης σύνθετων τύπων δεδομένων
Creators: name: Νανόπουλος, Αλέξανδρος
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Σύνθετοι τύποι δεδομένων
Εξόρυξη ιστού
Εξόρυξη χωρικών δεδομένων
Complex data types
Web mining
Spatial data mining

description: Η εξόρυξη δεδομένων παρουσιάζει σημαντικά αυξανόμενη πρόοδο τα τελευταία χρόνια. Πρόσφατα αναπτύχθηκαν βάσεις δεδομένων για σύνθετους τύπους δεδομένων. Προκύπτει, επομένως, η απαίτηση για νέες τεχνικές εξόρυξης. Η συνεισφορά της διατριβής επικεντρώνεται στους ακόλουθους τομείς. Αρχικά, παρουσιάζεται μια νέα τεχνική για εξόρυξη προτύπων από δεδομένα διασχίσεων σε μοντέλα με αναπαράσταση γράφου. Επίσης, προτείνονται αλγόριθμοι για την εύρεση ομοιοτήτων σε ακολουθιακά δεδομένα, καθώς και μέθοδοι για την αποθήκευση και διαχείρηση μεγάλων όγκων ακολουθιακών προτύπων. Τέλος, παρουσιάζεται ένας νέος αλγόριθμος συγκεντροποίησης σε χωρικές βάσεις δεδομένων και μια μέθοδος για δειγματοληψία με πόλωση ως προς την πυκνότητα. Ο τρόπος που γίνεται η ανάπτυξη της διατριβής, αποσκοπεί στην κάλυψη διαφορετικών τύπων σύνθετων και κατηγοριών προτύπων
description: During the last years, the research field of data mining has presented significant advances. The developments in the fields of large databases, created the need for efficient data mining in data bases with complex data types. The contribution of this dissertation focuses on the following. We first examine the problem of mining patterns from models with graph representation. Next, we propose a new technique for similarity searching in transactions databases we also focus on. The development of methods for the storage and searching large collections of sequential patterns. Finally, we propose a spatial clustering algorithm and we examine a density-biased sampling method
Weyl almost periodic selections of multivalued maps
Creators: name: Danilov, L. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42A75; 54C65

description: In this work we present some results on existence of Weyl almost periodic selections of multivalued maps taking values in a complete metric space.
description: 3 pages, LaTeX. Presented at the Conference: "Control Theory and Mathematical Modelling", Udmurt State University, Izhevsk, 3 - 8 July, 2006
Voice and learning in drama
Creators: name: Bolton Robinson, Lee
Publisher: name: University of British Columbia
Year: 2008

description: This case study investigated the nature of the learning that was the outcome of a dramatic experience in which a class of grade 9 students and their teacher, created, developed and produced a collective drama on the subject of the elderly. The findings of this study present evidence in support of the idea that when students engage in dramatic behaviours, they are able to give voice to their learning. Using ethnographic methodology, the teacher-researcher conducted the study in her own classroom during the final twelve weeks (April to June) of the school year in 1989. Student subjects were chosen randomly from a class of twenty-nine students in a comprehensive high-school setting in a western Canadian city. Detailed observation of student responses both within and after the drama experience was undertaken using data collected through a wide range of ethnographic techniques. These included: student and teacher journals, video data, audio recordings, photographic records and a document collection. A content analysis of the data revealed that student learning took place in five learning areas. These were learnings (1) about the elderly (2) about the self (3) about others and (4) about dramatic and language forms. By using Gavin Bolton's theory of learning in drama to frame the investigation, the researcher indicated that learning was given voice in the drama process. This is known as "voiced learning" and a scheme for assessing student learnings in drama learnings based on the types of voice is proposed.
Nonintegrability of (2+1)-dimensional continuum isotropic Heisenberg spin system: Painlevé analysis
Creators: name: Kumar, C. Senthil
name: Lakshmanan, M.
name: Grammaticos, B.
name: Ramani, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: While many integrable spin systems are known to exist in (1+1) and (2+1) dimensions, the integrability property of the physically important (2+1) dimensional isotropic Heisenberg ferromagnetic spin system in the continuum limit has not been investigated in the literature. In this paper, we show through a careful singularity structure analysis of the underlying nonlinear evolution equation that the system admits logarithmic type singular manifolds and so is of non-Painlevé type and is expected to be nonintegrable.
description: 11 pages. to be published in Phys. Lett. A (2006)
Ανάπτυξη μεθόδων προσδιορισμού ορισμένων ανιόντων με την τεχνική της έγχυσης του δείγματος σε συνεχή ροή-FIA
Creators: name: Τζαναβάρας, Παρασκευάς Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Προσδιορισμός ανιόντων
Φασματοφωτομετρία UV-VIS
Ενόργανη χημική ανάλυση
Determination of anions
UV-VIS Spectrophotomentry
Instrumental chemical analysis

description: Στη διδακτορική διατριβή περιγράφεται η ανάπτυξη και εφαρμογή αυτοματοποιημένων μεθόδων προσδιορισμού ορισμένων ανιόντων, χρησιμοποιώντας την τεχνική της έγχυσης δείγματος σε συνεχή ροή. Συγκεκριμένα αναπτύχθηκαν μέθοδοι κινητικού προσδιορισμού του κιτρικού οξέως και ταυτόχρονου προσδιορισμού των φθοριούχων και φθοροφωσφορικών ιόντων. Επίσης μέθοδος με εκχύλιση υγρού-υγρού για τον ταυτόχρονο προσδιορισμό των κυανιούχων και θειοκυανικών ιόντων, καθώς και ενζυμική μέθοδος προσδιορισμού του φθοροφωσφορικού ιόντος. Οι μέθοδοι που αναπτύχθηκαν είχαν ικανοποιητικά αναλυτικά χαρακτηριστικά και εφαρμόστηκαν με επιτυχία στην ανάλυση πραγματικών δειγμάτων
description: The PhD Thesis reports the development, validation and application of methods for the determination of anions, using flow injection analysis. Kinetic-based menthods are reported for the determination of citric acid and the simultaneus determination of fluorides and fluorophosphares a solvent extraction procedure is reported for the simultaneous determination of cyanides and thiocyanates. Finally, an enzymatic assay has been developed for the determination of fluorophosphates
Οικονομική ανάλυση της αειφορικής λειτουργίας προστατευόμενων φυσικών περιοχών: η περίπτωση της Δαδιάς Εβρου
Creators: name: Δημητρίου, Αγγελική Αλκιβιάδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Αειφορική ανάπτυξη
Οικονομική αποτίμηση
Εξαρτώμενη αποτίμηση
Περιβαλλοντικά οικονομικά
Economic evaluation
Sustainable development
Contingent valuation

description: Οι προστατευόμενες περιοχές αποτελούν απαραίτητο στοιχείο για τη διατήρηση των φυσικών πόρων. Συνήθως, οι οικολογικές και κοινωνικές αξίες των προστατευόμενων περιοχών υποεκτιμώνται σε βάρος των αντίστοιχων χρηματοοικονομικών αξιών, αφού ορισμένες από αυτές δύσκολα εκφράζονται με χρηματικούς όρους. Βασικός στόχος της έρευνας είναι να καταδείξει τη σημασία της οικονομικής ανάλυσης στην αειφορική λειτουργία και διαχείριση των προστατευόμενων φυσικών περιοχών. Συγκεκριμένα, επιχειρήθηκε η αποτίμηση της συνολικής οικονομικής αξίας ενός προστατευόμενου δασικού οικοσυστήματος, του δάσους της Δαδιάς, με την εφαρμογή της μεθόδου της εξαρτώμενης αποτίμησης. Τα βασικότερα συμπεράσματα συνοψίζονται παρακάτω : οι Ελληνες θεωρούν την προστασία του δάσους της Δαδιάς εξαιρετικά σημαντική. Η μέση μέγιστη προθυμία πληρωμής κυμαίνεται από 7.000 έως 10.000 δρχ. ενώ το εύρος της εισφοράς για το σύνολο του πληθυσμού της Ελλάδας κυμαίνεται από 34 έως 46 δισ. δραχμές
description: Protected areas with the range and the variety of their functions, constitute an essential element in the conservation of natural resources social benefits arising from protected areas are usually underestimated, as they can not be expressed in monetary terms since there is no market where they could be exchanged. The main objective of this dissertation has been to idicate the importance of the economic analysis in the substainable function and management of natural protected areas. An effort has been made to estimate the total economic value of the forest of Dadia in north Greece, using the contigent valuation method. The main conclusions are the following : citizens of greece, consider the protection of Dadia forest to be of high importance, and are willing to offer money for its conseration, for the total of the population the amount estimated ranges from 34 up to 46 billion dr., non use values are considered to be more important when compared to use values
Hydrothermal coupling in a rough fracture
Creators: name: Neuville, Amélie
name: Toussaint, Renaud
name: Schmittbuhl, Jean
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geophysics (physics.geo-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Heat exchange during laminar flow is studied at the fracture scale on the basis of the Stokes equation. We used a synthetic aperture model (a self-affine model) that has been shown to be a realistic geometrical description of the fracture morphology. We developed a numerical modelling using a finite difference scheme of the hydrodynamic flow and its coupling with an advection/conduction description of the fluid heat. As a first step, temperature within the surrounding rock is supposed to be constant. Influence of the fracture roughness on the heat flux through the wall, is estimated and a thermalization length is shown to emerge. Implications for the Soultz-sous-Forêts geothermal project are discussed.
Ενδοκυτταρικοί μηχανισμοί μεταγωγής μηνυμάτων στην καρδιά αρουραίου
Creators: name: Σερασκέρης, Στυλιανός Παναή
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Μεταγωγή μηνυμάτων
Τριφωσφορική ινοσιτόλη, ασβέστιο
Απομονωμένα μυοκύτταρα
Καρδιά αρουραίου
Signal transduction
Inositol triphosphare, calcium
Isolated myocytes
Rat heart

description: Διερευνήσαμε την ύπαρξη των 1a1d υποτύπων, των αδρενεργικών υποδεχέων στα καρδιακά μυοκύτταρα αρουραίου, έγιναν πειράματα ανταγωνιστικής σύνδεσης της [3Η]πραζοσίνης σε παρασκευάσματα κυτταρικών μεμβρανών. Παρουσία του ειδικού ανταγωνιστή των α1D-αδρενεργικών υποδοχέων ΒΜΥ 7378. Βρέθηκε ότι το 30% περίπου των θέσεων σύνδεσης της [3Η]-πραζοσίνης παρουσιάζει υψηλή συγγένεια για το ΒΜΥ 7378(pki, 9,19+-0,26). Επιπλέον μελετήθηκε η σχέση των α1D-με την ενεργοποίηση της υδρόλυσης των PtdIns. Η καμπύλη αναστολής από το ΒΜΥ 7378, της επαγόμενης από την αδρεναλίνη υδρόλυσης των PtdIns ήταν μονοφασική(pk6, 6,92+-0,28), ενώ από τις καμπύλες συγκέντρωσης-απόκρισης των μυοκυττάρων σε αυξανόμενες συγκεντρώσεις αδρεναλίνης, παρουσία ΒΜΥ 7378, προέκυψε ότι η ανασταλτική επίδραση του ΒΜΥ 7378 ήταν σημαντική σε υψηλές μόνο συγκεντρώσεις. Σε ότι αφορά στο ρόλο των ιόντων Ca(2+). Στην υδρόλυση των PtdIns, φαίνεται ότι ο σχηματισμός [3Η]PtdIns μετά από a1b-αδρενεργική διέργεση εξαρτάται ως ένα βαθμό από την εισροή ιόντων ca(2+). Διαπιστώσαμε επίσης, ότι ο εμποτισμός της απομόνωμένης καρδιάς αρουραίου με φαινυλεφρίνη βελτίωσε τη λειτουργική της ανάκτηση, ενώ μείωσε το βαθμό νέκρωσης ύστερα από ένα παρατεταμένο ισχαιμικό επεισόδιο χρήση ειδικών ανταγωνιστών των a1A και a1B- υποτύπων έδειξαν ότι η προσαρμογή της καρδιάς στην παρατεταμένη ισχαιμία σχετίζεται με την ενεργοποίηση των a1b-υποτύπων
description: We have used the 1a1D-selective antagonist, BMY 7378, to investigate the presence of a1D-adrenoceptor subtype in adult rat heart by radioligand binding assays. BMY 7378 inhibitted [3H] prazosin binding to cardiac metbranes in a biphasic mode(pki, 9.19+-0.26 for high affinity and 6.92+-0.09 for low affinity sites). According to our results a1D-adrenoceptors are expressed in adult rat but are not involved in the adrenaline induced stimulation of PtdIns hydrolysis. In other sries of experiments we studied the effects of icreased ca(2+) influx on a1-adrenoceptor stimulated insp formation in cardiac myocytes. Our data suggest that [3H]Insp formation induced by a1B adrenergic stimulation is in part mediated by ingreased ca(2+) influx. We also investicated the role of a1- adrenoceptors in adaptive mechanisms that protect the heart during prolonged ischemia. Our data suggest that stimulation of the a1b-but not the a1a-adrenoceptor subtype is responsible for the catecholamine-induced protection of ischaemic myocardium in rat
Real space tests of the statistical isotropy and Gaussianity of the WMAP CMB data
Creators: name: Lew, Bartosz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: ABRIDGED: We introduce and analyze a method for testing statistical isotropy and Gaussianity and apply it to the WMAP CMB foreground reduced, temperature maps, and cross-channel difference maps. We divide the sky into regions of varying size and shape and measure the first four moments of the one-point distribution within these regions, and using their simulated spatial distributions we test the statistical isotropy and Gaussianity hypotheses. By randomly varying orientations of these regions, we sample the underlying CMB field in a new manner, that offers a richer exploration of the data content, and avoids possible biasing due to a single choice of sky division. The statistical significance is assessed via comparison with realistic Monte-Carlo simulations. We find the three-year WMAP maps to agree well with the isotropic, Gaussian random field simulations as probed by regions corresponding to the angular scales ranging from 6 deg to 30 deg at 68% confidence level. We report a strong, anomalous (99.8% CL) dipole ``excess'' in the V band of the three-year WMAP data and also in the V band of the WMAP five-year data (99.3% CL). We notice the large scale hemispherical power asymmetry, and find that it is not highly statistically significant in the WMAP three-year data (~ 6 deg) and limit the systematical uncertainties to ~ 30 deg).
description: 20 pages, 20 figures; more tests added; updated to match the version to be published in JCAP
Οικοφυσιολογική αποτελεσματικότητα του πουρναριού (Quercus Cocciferal L.) υπό βόσκηση όπως αυτή επηρεάζεται από την αρχιτεκτονική του φυλλώματός του
Creators: name: Μαντρατζής, Παναγιώτης Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Οικοφυσιολογία
Υδατικό δυναμικό
Οσμωτικό δυναμικό
Δυναμικό Σπάργης
Ecophysiology
Water potential
Osmotic potential
Turgor potential

description: Το παρόν πόνημα προσπάθησε να μελετήσει διεξοδικά την αλληλεπίδραση δύο σπουδαίων περιοριστικών περιβαλλοντικών παραγόντων για τα μεσογειακά οικοσυστήματα, της βόσκησης και της υδατικής οικονομίας, στο πουρνάρι, η οποία θεωρείται εξαιρετικά ενδιαφέρουσα για την παραγωγικότητα των πρινώνων, δεδομένων της μεγάλης επιφάνειας που καταλαμβάνουν και της ξεχωριστής θρεπτικής τους αξίας, ακόμα και τη χειμερινή περίοδο. Η έρευνα έγινε στο Πειραματικό Κέντρο Χρυσοπηγής Σερρών κατά τη διάρκεια των ετών 1997-2000, οπότε και μετρήθηκαν, πέραν της καταγραφής των υφισταμένων κλιματικών συνθηκών της περιοχής, μικροκλιματικά δεδομένα, υδροδυναμικές, φυσιολογικές και αυξητικές παράμετροι, ενώ υπολογίστηκαν αλλομετρικές παράμετροι. Από τα παραπάνω διαπιστώθηκε ότι η βόσκηση προσδίδει στα πουρνάρια σειρά χαρακτηριστικών πλεονεκτημάτων για απρόσκοπτη και σταθεροποιημλενη παραγωγή, ενώ η αρχιτεκτονική δομή της κόμης τους, υπό βόσκηση και ξηρασία, προσφέρει σε αυτά ισχυρή φαινοτυπική πλαστικότητα, ισχυρό αντισταθμιστικό μηχανισμό βάρους/επιφανείας φύλλων, υψηλή ικανότητα ανάρρωσης μετά από βόσκηση, υψηλό δείκτη βοσκοανθεκτικότητας, υποδηλώνοντας αιτιώδη σχέση μεταξύ υδατικού δυναμικού, δείκτη φυλλικής επιφάνειας και παραγωγής
description: The aim of this research was to investigate the interaction between drought and grazing in relation to the internal water status of leaves in kermes oak canopy, which are significant environmental constraints upon primary production in Medirerranean shrublands. The experimental research was conducted during 1997-2000 in Chrysopigi of Serres. The hydrodynamic, physiological and growth parameters by helping scientific equipment or calculated using the suitable formulas during the growing season. The results indicated that phenotypical plasticity, mechanism of counter weighting relating weight and area of leaves, high index of resistance to grazing, function homeostasis and causal nexus between water potential-leaf area index-production occured in kermes oak canopy
Scattering approach to current and noise in interacting mesoscopic systems
Creators: name: Do, V. Nam
name: Dollfus, P.
name: Nguyen, V. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose an extension of the Landauer-Buttiker scattering theory to include effects of interaction in the active region of a mesoscopic conductor structure. The current expression obtained coincides with those derived by different methods. A new general expression for the noise is also established. These expressions are then discussed in the case of strongly sequential tunneling through a double-barrier resonant tunneling structure.
description: 11 pages, 2 figures, rediscussion
Magnetic dynamos in white dwarfs -- II. Relating magnetism and pollution
Creators: name: Schreiber, Matthias R.
name: Belloni, Diogo
name: Gaensicke, Boris T.
name: Parsons, Steven G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We investigate whether the recently suggested rotation and crystallization driven dynamo can explain the apparent increase of magnetism in old metal polluted white dwarfs. We find that the effective temperature distribution of polluted magnetic white dwarfs is in agreement with most/all of them having a crystallizing core and increased rotational velocities are expected due to accretion of planetary material which is evidenced by the metal absorption lines. We conclude that a rotation and crystallization driven dynamo offers not only an explanation for the different occurrence rates of strongly magnetic white dwarfs in close binaries, but also for the high incidence of weaker magnetic fields in old metal polluted white dwarfs.
description: Accepted for publication in MNRAS Letters
Survival probability of surface excitations in a 2d lattice: non-Markovian effects and Survival Collapse
Creators: name: Fiori, E. Rufeil
name: Pastawski, H. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The evolution of a surface excitation in a two dimentional model is analyzed. I) It starts quadratically up to a spreading time t_{S}. II) It follows an exponential behavior governed by a self-consistent Fermi Golden Rule. III) At longer times, the exponential is overrun by an inverse power law describing return processes governed by quantum diffusion. At this last transition time t_{R} a survival collapse becomes possible, bringing the survival probability down by several orders of magnitude. We identify this strongly destructive interference as an antiresonance in the time domain.
description: 4 pages, 3 figures. Braz. Journ. of Phys., in press. Braz. Journ. of Phys., in press. Braz. Journ. of Phys., in press. Braz. Journ. of Phys., in press. Braz. Journ. of Phys., in press. Braz. Journ. of Phys., in press. Braz. Journ. of Phys., in press
Οι νεοελληνικές διασκευές του "Απολλώνιου της Τύρου" μέσα στα ρομανικά τους συμφραζόμενα: στοιχεία εκχριστιανισμού, προσαρμογής και πρωτοτυπίας
Creators: name: Carbonell, Santiago
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Απολλώνιος ο Τύριος
Τύρος
Μυθιστορία
Ελληνικό μυθιστόρημα
Μεσαιωνική ελληνική λογοτεχνία
Συγκριτική λογοτεχνία
Greek romance
Medieval greek literature
Comparative literature

description: Η μυθιστορία του Απολλωνίου είναι ένα από τα έργα με μεγαλύτερη διάδοση στα μεσαιωνικά χρόνια και αργότερα σε ολόκληρη την Ευρώπη.Ο βασικός στόχος αυτής της διδακτορικής διατριβής είναι να αναφανούν οι πρωτοβουλίες που εισάγουν ως προς το περιεχόμενο οι ελληνόγλωσσοι συγγραφείς που διασκεύασαν αυτό το έργο. Συγκεκριμένα, συγκρίνουμε τις ελληνικές μυθιστορίες του Απολλώνιου με άλλες διασκευές που συντέθηκαν σε άλλα μέρη και άλλες γλώσσες κατά τις ίδιες περίπου εποχές στις οποίες τοποθετούνται οι ελληνικές επεξεργασίες. Περιορίσαμε τη συγκριτική έρευνα σε τρεις ρομανικές λογοτεχνικές παραδόσεις, την ισπανική, τη γαλλική και την ιταλική. Τα θέματα που εξετάζονται είναι η πλοκή και η αφηγηματική δομή, τα θρησκευτικά και πολιτισμικά στοιχεία ο έρωτας και το ήθος των προσώπων. Συμφωνούμε με τη θεωρία της κυπριακής προέλευσης της ανώνυμης μεσαιωνικής μορφής του έργου. Ο έντονος εκχριστιανισμός της ιστορίας μαζί με τους ιδιωματισμούς και τις γεωγραφικές ενδείξεις αυτού του κειμένου, μας οδηγούν στο συμπέρασμα αυτό. θεωρούμε εξάλλου το κείμενο αυτό ως πιθανή δευτερεύουσα πηγή έμπνευσης του στιχουργού της κρητικής ομοιοκατάληψης διασκευής του 16ου αιώνα.
description: Apollonius of Tyre is one of the novels that had a major diffusion in Europe during the Middle Ages and the Renaissance. The main object of this research is to show the originality of the authors who recomposed this work in greek language. For this purpose we made use of the comparative method. The two greek texts of "Apollonius" have been confronted with another versions writeen about the same period, but belonging to defferent mediterranean literary traditions, namely spanish, french and italian. Emphasis has been given on the following matters : plot and narrative structure, religious and cultural elements, love, as well as the character\'s ethos. With regard to the origin of the anonymous greek version we believe that the theory of a cypriot author is the most possible. The profound christianization of the story, along with the idiomatic use of language and several geographical allusions, we find in it, lead us to this conclusion. In addition, this no rhymed medieval version seems to be a secondary source of the rhymed cretan version that dates to the 16th century.
Anomalous Higgs boson couplings in vector boson fusion at the CERN LHC
Creators: name: Figy, T.
name: Hankele, V.
name: Klamke, G.
name: Zeppenfeld, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Deviations from SM expectations in the Higgs sector can be parameterized by an effective Lagrangian. The corresponding anomalous couplings have been implemented in a Monte Carlo program for Higgs production in vector boson fusion, at NLO QCD accuracy. It allows to study anomalous coupling effects for production and decay of the Higgs boson. We analyze deviations allowed by LEP data and study a new azimuthal angle variable which directly measures the interference between CP-even, CP-odd and SM couplings.
description: 15 pages, 8 figures
The Representative XMM-Newton Cluster Structure Survey (REXCESS) of an X-ray Luminosity Selected Galaxy Cluster Sample
Creators: name: Boehringer, H.
name: Schuecker, P.
name: Pratt, G. W.
name: Arnaud, M.
name: Ponman, T. J.
name: Croston, J. H.
name: Borgani, S.
name: Bower, R. G.
name: Briel, U. G.
name: Collins, C. A.
name: Donahue, M.
name: Forman, W. R.
name: Finoguenov, A.
name: Geller, M. J.
name: Guzzo, L.
name: Henry, J. P.
name: Kneissl, R.
name: Mohr, J. J.
name: Matsushita, K.
name: Mullis, C. R.
name: Ohashi, T.
name: Pedersen, K.
name: Pierini, D.
name: Quintana, H.
name: Raychaudhury, S.
name: Reiprich, T. H.
name: Romer, A. K.
name: Rosati, P.
name: Sabirli, K.
name: Temple, R. F.
name: Viana, P. T. P.
name: Vikhlinin, A.
name: Voit, G. M.
name: Zhang, Y. -Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The largest uncertainty for cosmological studies using clusters of galaxies is introduced by our limited knowledge of the statistics of galaxy cluster structure, and of the scaling relations between observables and cluster mass. To improve on this situation we have started an XMM-Newton Large Programme for the in-depth study of a representative sample of 33 galaxy clusters, selected in the redshift range z=0.055 to 0.183 from the REFLEX Cluster Survey, having X-ray luminosities above 0.4 X 10^44 h_70^-2 erg s^-1 in the 0.1 - 2.4 keV band. This paper introduces the sample, compiles properties of the clusters, and provides detailed information on the sample selection function. We describe the selection of a nearby galaxy cluster sample that makes optimal use of the XMM-Newton field-of-view, and provides nearly homogeneous X-ray luminosity coverage for the full range from poor clusters to the most massive objects in the Universe. For the clusters in the sample, X-ray fluxes are derived and compared to the previously obtained fluxes from the ROSAT All-Sky Survey. We find that the fluxes and the flux errors have been reliably determined in the ROSAT All-Sky Survey analysis used for the REFLEX Survey. We use the sample selection function documented in detail in this paper to determine the X-ray luminosity function, and compare it with the luminosity function of the entire REFLEX sample. We also discuss morphological peculiarities of some of the sample members. The sample and some of the background data given in this introductory paper will be important for the application of these data in the detailed studies of cluster structure, to appear in forthcoming publications.
description: 17 pages, 17 figures; to appear in A&A. A pdf version with full-quality figures can be found at ftp://ftp.xray.mpe.mpg.de/people/gwp/xmmlp/xmmlp.pdf
A geometric method to locate Neptune
Creators: name: Bhatnagar, Siddharth
name: Vyasanakere, Jayanth P.
name: Murthy, Jayant
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Physics (physics.class-ph)
subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: We develop a direct geometric method to determine the orbital parameters and mass of a planet, and we then apply the method to Neptune using high-precision data for the other planets in the solar system. The method is direct in the sense that it does not involve curve fitting. This paper, thereby, offers a new pedagogical approach to orbital mechanics that could be valuable in a physics classroom.
description: Accepted for publication in American Journal of Physics
Broadcasting of three qubit entanglement via local copying and entanglement swapping
Creators: name: Adhikari, Satyabrata
name: Choudhury, B. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work,We investigate the problem of secretly broadcasting of three-qubit entangled state between two distant partners. The interesting feature of this problem is that starting from two particle entangled state shared between two distant partners we find that the action of local cloner on the qubits and the measurement on the machine state vector generates three-qubit entanglement between them. The broadcasting of entanglement is made secret by sending the measurement result secretly using cryptographic scheme based on orthogonal states. Further we show that this idea can be extended to generate three particle entangled state between three distant partners.
description: 18 pages, 4 figures, Accepted in Physical Review A
Hawking radiation of Dirac particles via tunneling from Kerr black hole
Creators: name: Li, Ran
name: Ren, Ji-Rong
name: Wei, Shao-Wen
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigated Dirac Particles' Hawking radiation from event horizon of Kerr black hole in terms of the tunneling formalism. Applying WKB approximation to the general covariant Dirac equation in Kerr spacetime background, we obtain the tunneling probability for fermions and Hawking temperature of Kerr black hole. The result obtained by taking the fermion tunneling into account is consistent with the previous literatures.
description: 7 pages, no figures, to appear in CQG
The Three-Boson System at Next-To-Next-To-Leading Order
Creators: name: Platter, L.
name: Phillips, D. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Nuclear Theory (nucl-th)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We discuss effective field theory treatments of the problem of three particles interacting via short-range forces (range R >> a_2, with a_2 the two-body scattering length). We show that forming a once-subtracted scattering equation yields a scattering amplitude whose low-momentum part is renormalization-group invariant up to corrections of O(R^3/a_2^3). Since corrections of O(R/a_2) and O(R^2/a_2^2) can be straightforwardly included in the integral equation's kernel, a unique solution for 1+2 scattering phase shifts and three-body bound-state energies can be obtained up to this accuracy. We use our equation to calculate the correlation between the binding energies of Helium-4 trimers and the atom-dimer scattering length. Our results are in excellent agreement with the recent three-dimensional Faddeev calculations of Roudnev and collaborators that used phenomenological inter-atomic potentials.
description: 20 pages, 3 eps figures
Deconfinement transition for nonzero baryon density in the Field Correlator Method
Creators: name: Simonov, Yu. A.
name: Trusov, M. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Deconfinement phase transition due to disappearance of confining colorelectric field correlators is described using nonperturbative equation of state. The resulting transition temperature $T_c(μ)$ at any chemical potential $μ$ is expressed in terms of the change of gluonic condensate $ΔG_2$ and absolute value of Polyakov loop $L_{fund} (T_c)$, known from lattice and analytic data, and is in good agreement with lattice data for $ΔG_2 \approx 0.0035 $ GeV$^4$. E.g. $T_c(0) =0.27; 0.19; 0.17$ GeV for $n_f=0,2,3$ respectively.
description: 8 pages, 1 figure, LaTeX2e; some typos corrected