cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Acoustic attenuation rate in the Fermi-Bose model with a finite-range fermion-fermion interaction
Creators: name: Mihaila, Bogdan
name: Gaudio, Sergio
name: Bedell, Kevin S.
name: Blagoev, Krastan B.
name: Timmermans, Eddy
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the acoustic attenuation rate in the Fermi-Bose model describing a mixtures of bosonic and fermionic atom gases. We demonstrate the dramatic change of the acoustic attenuation rate as the fermionic component is evolved through the BEC-BCS crossover, in the context of a mean-field model applied to a finite-range fermion-fermion interaction at zero temperature, such as discussed previously by M.M. Parish et al. [Phys. Rev. B 71, 064513 (2005)] and B. Mihaila et al. [Phys. Rev. Lett. 95, 090402 (2005)]. The shape of the acoustic attenuation rate as a function of the boson energy represents a signature for superfluidity in the fermionic component.
SYNTHESIS OF EVIDENCE FOR PUBLIC POLICIES TO CONFIGHT DOMESTIC VIOLENCE IN PRIVATE COMPANIES
Creators: name: Xavier, Luanna Pereira de Lima Carvalho
name: d'Oliveira, Ana Flávia Pires Lucas
name: Germani, Ana Claudia Camargo Gonçalves
Publisher: name: Zenodo
Year: 2023

description: Domestic violence against women has been the subject of debates and social mobilization.
Considering the impact of domestic violence on the professional lives of these women and
the importance of private companies offering support to their female employees experiencing
domestic violence, this research project aims to compile a synthesis of evidence for public
policies addressing domestic violence by private companies. The objectives are to analyze the
involvement of private companies in addressing domestic violence, map the initiatives of
private companies in dealing with employees in situations of domestic violence, and examine
whether public policies engage private companies in addressing domestic violence. This work
consists of a literature review that will follow the methodological guidelines for Evidence
Synthesis for Health Policy of the Ministry of Health in 2020, and a deliberative dialogue,
with the conduct of the dialogue following the methodological guidelines for Deliberative
Dialogues of the Ministry of Health in 2023. The chosen methodology for analyzing the
material obtained in the dialogue is thematic analysis.
Additional file 3 of The complete genome sequence of a bile-isolated Stenotrophomonas maltophilia ZT1
Creators: name: Zhang, Min
name: Li, Lixiang
name: Pan, Hongwei
name: Zhou, Tao
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 3. Table S3. The secretion system associated virulence factor in S. maltophilia ZT1 predicted by VFDB.
SYNTHESIS OF EVIDENCE FOR PUBLIC POLICIES TO CONFIGHT DOMESTIC VIOLENCE IN PRIVATE COMPANIES
Creators: name: Xavier, Luanna Pereira de Lima Carvalho
name: d'Oliveira, Ana Flávia Pires Lucas
name: Germani, Ana Claudia Camargo Gonçalves
Publisher: name: Zenodo
Year: 2024

description: Domestic violence against women has been the subject of debates and social mobilization.
Considering the impact of domestic violence on the professional lives of these women and
the importance of private companies offering support to their female employees experiencing
domestic violence, this research project aims to compile a synthesis of evidence for public
policies addressing domestic violence by private companies. The objectives are to analyze the
involvement of private companies in addressing domestic violence, map the initiatives of
private companies in dealing with employees in situations of domestic violence, and examine
whether public policies engage private companies in addressing domestic violence. This work
consists of a literature review that will follow the methodological guidelines for Evidence
Synthesis for Health Policy of the Ministry of Health in 2020, and a deliberative dialogue,
with the conduct of the dialogue following the methodological guidelines for Deliberative
Dialogues of the Ministry of Health in 2023. The chosen methodology for analyzing the
material obtained in the dialogue is thematic analysis.
Amplituhedron-like geometries
Creators: name: Dian, Gabriele
name: Heslop, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider amplituhedron-like geometries which are defined in a similar way to the intrinsic definition of the amplituhedron but with non-maximal winding number. We propose that for the cases with minimal number of points the canonical form of these geometries corresponds to the product of parity conjugate amplitudes at tree as well as loop level. The product of amplitudes in superspace lifts to a star product in bosonised superspace which we give a precise definition of. We give an alternative definition of amplituhedron-like geometries, analogous to the original amplituhedron definition, and also a characterisation as a sum over pairs of on-shell diagrams that we use to prove the conjecture at tree level. The union of all amplituhedron-like geometries has a very simple definition given by only physical inequalities. Although such a union does not give a positive geometry, a natural extension of the standard definition of canonical form, the globally oriented canonical form, acts on this union and gives the square of the amplitude.
description: 58 pages
Numerical models of the general circulation in the Strait of Georgia
Creators: name: Marinone, Silvio Guido
Publisher: name: University of British Columbia
Year: 2009

description: Numerical models have been used to study the low frequency (< 0.5 cycles per day) currents of the Strait of Georgia. In the central part of the Strait, the observed mean (i.e., time-averaged) residual circulation is characterized by cyclonic eddies in the velocity field of about eight kilometers in diameter. The observed low frequency currents account for approximately half of the total kinetic energy of the fluctuating currents; the other half is associated with diurnal and semidiurnal tidal currents. These low frequency currents have about one-third of their energy at the fortnightly and monthly bands. The magnitudes of the mean and low frequency fluctuating components are about the same. Two different models are used in this thesis to study these currents. The first is a depth-independent numerical model. The model reproduces the location and scale of the observed depth-averaged mean residual but significantly underestimates the magnitude of the velocity. The model low frequency oscillations are basically confined to the fortnightly band and once again the magnitude of the velocity is significantly underestimated. The second is a three-dimensional baroclinic model. This model has energy levels that are comparable to those of the observed mean residual and low frequency components. The spatial and temporal structure are now reasonably reproduced especially for the fluctuating component. Bearing in mind the limitations of the models in reproducing the observed residual (particularly the depth-averaged model) various diagnostic analyses have been performed with the aim of revealing the mechanism(s) maintaining the observed residual. It has been found that no matter where the energy comes from (e.g., baroclinic forcing, wind or tides) the non-linear interactions transfer energy to the low frequency bands. Deep-water renewal in the Strait of Georgia has been successfully modeled. Renewal occurs in the model, during summer, once a month. The phase and amplitude of renewal events compare well with those observed in the central Strait of Georgia. A deep water renewal event starts at extreme neap tides, the time of minimal mixing, when maximum stratification is reached at Boundary Passage and the denser waters of Juan de Fuca Strait penetrate past the sill at Boundary Passage and reach the bottom of the deep basin in the central Strait of Georgia as a gravity current.
Frustrated tunneling dynamics in ultrashort laser pulses
Creators: name: Olofsson, Edvin
name: Carlström, Stefanos
name: Dahlström, Jan Marcus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a model for frustrated tunneling ionization using ultrashort laser pulses. The model is based on the strong field approximation and it employs the saddle point approximation to predict quasiclassical trajectories that are captured on Rydberg states. We present a classification of the saddle-point solutions and explore their behavior as functions of angular momentum of the final state, as well as the carrier--envelope phase (CEP) of the laser pulse. We compare the final state population computed by the model to results obtained by numerical propagation of the time-dependent Schrödinger equation (TDSE) for the hydrogen atom. While we find qualitative agreement in the CEP dependence of the populations in principal quantum numbers, $n$, the populations to individual angular momentum channels, $\ell$, are found to be inconsistent between model and TDSE. Thus, our results show that improvements of the quasiclassical trajectories are in order for a quantitative model of frustrated tunneling ionizaiton.
Αξιολόγηση της ποιότητας των παρεχόμενων υπηρεσιών της Τοπικής Αυτοδιοίκησης: Η περίπτωση του Δήμου Νεάπολης-Συκεών
Creators: name: Παπάζογλου, Απόστολος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Τοπική Αυτοδιοίκηση
Νέα Δημόσια Διοίκηση
Κενό ποιότητας
Local government
New Public Management
Quality gap

description: Τα τελευταία χρόνια παρατηρούνται αλλαγές στο χώρο της Δημόσιας Διοίκησης και ειδικότερα στο χώρο της Τοπικής Αυτοδιοίκησης. Τόσο οι δημόσιες, όσο και οι δημοτικές υπηρεσίες, επηρεασμένες από το μοντέλο της Νέας Δημόσιας Διοίκησης, ενδιαφέρονται περισσότερο για την καλύτερη εξυπηρέτηση του πολίτη και προσπαθούν να παρέχουν υψηλής ποιότητας υπηρεσίες. Η παρούσα εργασία, λοιπόν, προσπαθεί να μελετήσει την ποιότητα των παρεχόμενων υπηρεσιών στο Δήμο Νεάπολης Συκεών και ειδικότερα στο Κέντρο Εξυπηρέτησης Πολιτών και στο Γραφείο Κοινωνικής Πολιτικής, που εδρεύουν στο Δημαρχείο Νεάπολης-Συκεών. Για τη διεξαγωγή της έρευνας σχεδιάστηκε ερωτηματολόγιο, βασισμένο στη μέθοδο SERVQUAL. Στόχος της έρευνας είναι να εντοπιστεί το κενό ποιότητας μεταξύ των προσδοκιών των πολιτών και των αντιλήψεων που αποκόμισαν, καθώς και τα σημεία που απαιτούν αλλαγή. Τα αποτελέσματα ήταν θετικά, διότι το κενό ποιότητας δεν ήταν μεγάλο
description: In recent years changes are observed in the public administration and especially in the local governance area. Both public and municipal services, influenced by the model of New Public Management, put the citizen at the center of their functioning and strive to provide high quality services. Therefore the present study tries to investigate the quality of services in the Municipality of Neapolis Sikeon and especially in the Citizen Service Center and in the Office of Social Affairs. To conduct this research a questionnaire was designed based on SERVQUAL method. The aim of this study was to identify the quality gap between citizens’ expectations and perceptions, suggest the elements that require change in order to provide higher service quality. The results were positive, because the quality gap was not large
The Muon Magnetic Moment and Supersymmetry
Creators: name: Stöckinger, Dominik
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The present review is devoted to the muon magnetic moment and its role in supersymmetry phenomenology. Analytical results for the leading supersymmetric one- and two-loop contributions are provided, numerical examples are given and the dominant tan(beta)sign(mu)/M_SUSY^2 behaviour is qualitatively explained. The consequences of the Brookhaven measurement are discussed. The 2 sigma deviation from the Standard Model prediction implies preferred ranges for supersymmetry parameters, in particular upper and lower mass bounds. Correlations with other observables from collider physics and cosmology are reviewed. We give, wherever possible, an intuitive understanding of each result before providing a detailed discussion.
description: Topical Review; 54 pages, 18 figures
SRG/eROSITA discovery of a large circular SNR candidate G116.6-26.1: SN Ia explosion probing the gas of the Milky Way halo?
Creators: name: Churazov, E. M.
name: Khabibullin, I. I.
name: Bykov, A. M.
name: Chugai, N. N.
name: Sunyaev, R. A.
name: Zinchenko, I. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report a discovery of a new X-ray-selected supernova remnant (SNR) candidate SRGe~J0023+3625 = G116.6-26.1 found in the SRG/eROSITA all-sky survey. The source features a large angular extent ($\sim 4$ deg in diameter), nearly circular shape and X-ray spectrum dominated by emission lines of helium- and hydrogen-like oxygen. It lacks bright counterparts of similar extent at other wavelengths which could be unequivocally associated with it. Given the relatively high Galactic latitude of the source, $b\approx-26$ deg, we interpret these observational properties as an indication of the off-disk location of this SNR candidate. Namely, we propose that this object originated from a Type Ia supernova which exploded some 40 000 yr ago in the low density ($\sim 10^{-3}\,{\rm cm^{-3}}$) and hot ($\sim (1-2)\times10^6\,{\rm K}$) gas of the Milky Way halo at a distance of $\sim 3\,{\rm kpc}$ from the Sun. The low density of the halo gas implies that the cooling and collisional ionization equilibrium (CEI) timescales downstream of the forward shock are much longer than the age of the SNR. This results in a relatively soft spectrum, reflecting pre-shock ionization state of the gas, and strong boost in the plasma emissivity (compared to CEI) due to enhanced collisional excitation through the increased electron temperature. If confirmed, such a rare object would provide us with a unique "in situ" probe of physical conditions (density, temperature and metallicity) near the interface between the Milky Way's disk and the halo.
description: MNRAS, accepted
Probing quantum phases of ultracold atoms in optical lattices by transmission spectra in cavity QED
Creators: name: Mekhov, Igor. B.
name: Maschler, Christoph
name: Ritsch, Helmut
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Studies of ultracold atoms in optical lattices link various disciplines, providing a playground where fundamental quantum many-body concepts, formulated in condensed-matter physics, can be tested in much better controllable atomic systems, e.g., strongly correlated phases, quantum information processing. Standard methods to measure quantum properties of Bose-Einstein condensates (BECs) are based on matter-wave interference between atoms released from traps which destroys the system. Here we propose a nondestructive method based on optical measurements, and prove that atomic statistics can be mapped on transmission spectra of a high-Q cavity. This can be extremely useful for studying phase transitions between Mott insulator and superfluid states, since various phases show qualitatively distinct light scattering. Joining the paradigms of cavity quantum electrodynamics (QED) and ultracold gases will enable conceptually new investigations of both light and matter at ultimate quantum levels, which only recently became experimentally possible. Here we predict effects accessible in such novel setups.
description: 6 pages, 3 figures
Deconfinement and cold atoms in optical lattices
Creators: name: Cazalilla, M. A.
name: Ho, A. F.
name: Giamarchi, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Despite the fact that by now one dimensional and three dimensional systems of interacting particles are reasonably well understood, very little is known on how to go from the one dimensional physics to the three dimensional one. This is in particular true in a quasi-one dimensional geometry where the hopping of particles between one dimensional chains or tubes can lead to a dimensional crossover between a Luttinger liquid and more conventional high dimensional states. Such a situation is relevant to many physical systems. Recently cold atoms in optical traps have provided a unique and controllable system in which to investigate this physics. We thus analyze a system made of coupled one dimensional tubes of interacting fermions. We explore the observable consequences, such as the phase diagram for isolated tubes, and the possibility to realize unusual superfluid phases in coupled tubes systems.
description: Proceedings of the conference on "Quantum Many Body Theories 13", to be published by World Scientific
Current bounds on the Type-Z $Z_3$ three Higgs doublet model
Creators: name: Boto, Rafael
name: Romão, Jorge C.
name: Silva, João P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Type-Z models, where charged leptons, up type quarks, and down type quarks each couple to a different scalar, are only possible when there are three or more Higgs doublets. We consider the Type-Z three Higgs doublet model imposed by a softly broken $Z_3$ symmetry. We take into account all theoretical and experimental constraints, highlighting the importance of perturbative unitarity and bounded from below conditions that we develop here, and which have a strong impact on $B \rightarrow X_s γ$. Since there can be cancellations between the two charged Higgs in $B \rightarrow X_s γ$ (and in $h \rightarrow γγ$), the lower bounds obtained on the charged Higgs masses are alleviated. We also discuss in detail the important physical differences between exact alignment and approximate alignment, and present some useful benchmark points.
description: 32 pages, 23 Figures in PDF. v2: impact of BFB corrected, benchmarks added
Μέθοδοι Προβλέψεων Νέων Προϊόντων
Creators: name: Γκογκίδης-Μωυσίδης, Αθανάσιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Προβλέψεις-Νέα Προϊόντα
Εκθετική Εξομάλυνση
Forecasting-New Items
Exponential Smoothing

description: Καταλυτικός παράγοντας στην επιτυχία μιας εταιρίας αποτελεί ο περιορισμός της αβεβαιότητας. Προκειμένου να επιτευχθεί κάτι τέτοιο, πρέπει μέσα από μια πλειάδα να επιλεχθεί η κατάλληλη μέθοδος προβλέψεων, που με την σειρά της θα οδηγήσει σε πετυχημένη διαδικασία λήψης αποφάσεων. Αδιαμφισβήτητα, ο ρόλος των προβλέψεων είναι καθοριστικός, ειδικότερα στο σύγχρονο επιχειρηματικό περιβάλλον που χαρακτηρίζεται όχι μόνο από μεγάλο βαθμό αβεβαιότητας αλλά και από ισχυρό ανταγωνισμό. Αυτό αποτελεί και το κίνητρο για την εκπόνηση της παρούσας διπλωματικής εργασίας. Η οποία αποτελείται από δύο μέρη: Στο πρώτο μέρος αναλύονται οι παραδοσιακές μέθοδοι προβλέψεων και αποτελείται από πέντε κεφάλαια, ενώ στο δεύτερο μέρος συμπεριλαμβάνεται η θεωρία των προβλέψεων σε νέα προϊόντα καθώς επίσης και η εφαρμογή ενός αλγορίθμου σε δεδομένα της εταιρίας Λέντζιος Π. - Μηνάς Π. ΟΕ
description: It’s crucial to contain uncertainty for a company to success. This to be achieved, the most appropriate forecasting method should be used, which can lead in a successful decision making. Undisputedly, forecasting has profound impact, especially in the modern competitive business environment, characterized by an extended degree of uncertainty. The aforementioned is the motive for the thesis, which is consisted by two parts: The first one analyses the traditional forecasting methods, while the second includes the theory of forecasting new items and the implementation of an algorithm in the Lentzios P. –Minas P company’s data
Chiral Dynamics beyond the Standard Model
Creators: name: Stern, Jan
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The SM Lagrangian without physical scalars is rewritten as the LO of a Low-Energy Effective Theory invariant under a higher non linear symmetry S_{nat} \supset SU(2)_W \times U(1)_Y. Soft breaking of S_{nat} defines a hierarchy of non standard effects dominated by universal couplings of right-handed quarks to W. The interface of corresponding EW tests with non perturbative QCD aspects is briefly discussed.
description: 6 pages, Tallk given at QCD06 Conference, Montpellier, France, 3-7 July 2006, to appear in the Proceedings
Additional file 1 of The complete genome sequence of a bile-isolated Stenotrophomonas maltophilia ZT1
Creators: name: Zhang, Min
name: Li, Lixiang
name: Pan, Hongwei
name: Zhou, Tao
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1. Table S1. The results indicated that more than 500 hundred virulence-associated genes were predicted in the genome of strain ZT1.
Grammatical elicitation: Ditransitives and fronting with ko
Creators: name: Yegon, Kiplangat
name: Bossi, Madeline
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: sgc

description: One .mp4 file and one .pdf file. Elicitation of ditransitives with multiple local person objects. Elicitation of reconstruction effects with fronting with ko.
From Quark Gluon Plasma to a Perfect Fluid of Quarks and Beyond
Creators: name: Csanad, M.
name: Csorgo, T.
name: Lorstad, B.
name: Nagy, M.
name: Ster, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: With high energy heavy ion collisions one tries to create a new forms of matter that is similar to the one present at the birth of our Universe. Recent development on flow pattern, initial energy-density and freeze-out temperature shows that most likely this new form of matter is in a deconfined state, has colored degrees of freedom and is more fluid-like than gas-like. In present paper we calculate estimations on the physical properties of this new-old matter.
description: 10 pages, 5 figures, to appear in the proceedings of the 44th International School of Subnuclear Physics, Erice, Sicily, 29 August - 7 September 2006
Value Investing
Creators: name: Βασιλάκη, Ευφραιμία-Λουΐζα Γεράσιμου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Επένδυση στην αξία
Επενδυτής αξίας
Περιθώριο ασφαλείας
Value investing
Value investor
Margin of safety

description: Στην παρούσα μελέτη γίνεται πλήρη ανάλυση της τεχνικής επενδύσεων «Value Investing». Η μελέτη χωρίζεται σε δύο μέρη, στο θεωρητικό και στο πρακτικό, προκειμένου να γίνει πλήρη αποσαφήνιση όλων το σημείων της. Αρχικά πραγματοποιείται ανάλυση της ιστορικής εξέλιξης της από το 1930 όπου και τοποθετείται η πρώτη εμφάνιση της με πατέρα αυτής τον Benjamin Graham και εν συνεχεία των Warren Buffett. Παράλληλα στην μελέτη ενσωματώνονται και όλα τα σημαντικότερα επενδυτικά επιτεύγματα λόγω της επενδυτικής τεχνικής «Value Investing». Στο δεύτερο μέρος της εργασίας πραγματοποιήθηκε μελέτη περίπτωσης στην εταιρία Cigna Corp. προκειμένου να χρησιμοποιηθούν όλα τα κριτήρια του «Value Investing» και να αποδειχθεί για ακόμη μια φορά η χρησιμότητα και εγκυρότητά τους καθώς και τα βήματα που πρέπει να ακολουθηθούν ώστε να κριθεί μια μετοχή ως «Value Investing». Σύμφωνα με τις μελέτες όλων των ετών καθώς και την μελέτη της Cigna Corp. ανακύπτει το συμπέρασμα ότι οι εταιρίες που πληρούν τα κριτήρια ‘Value Investing’ βάσει Graham αποτελούν επενδυτικές ευκαιρίες δηλαδή ‘επενδύσεις αξίας’
description: This study attempts to analyze the “Value Investing” method. Separating this study into two parts, theoretical and technical part, leads to a better understanding of this investing method. The first part, is the record of the historical evolution of the method and the introduction of the best value investors, Benjamin Graham and Warren Buffett together with their best value investing accomplishments. The second part of this study is a case study using the Value investing method and its criteria on Cinga Corp. Based on the historical data and on the case study, every company that meets the criteria of Value investing it is a value investing company
Origin of holographic dark energy models
Creators: name: Myung, Yun Soo
name: Seo, Min-Gyun
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the origin of holographic dark energy models which were recently proposed to explain the dark energy-dominated universe. For this purpose, we introduce the spacetime foam uncertainty of $δl \ge l_{\rm p}^αl^{α-1}$. It was argued that the case of $α=2/3$ could describe the dark energy with infinite statistics, while the case of $α=1/2$ can describe the ordinary matter with Bose-Fermi statistics. However, two cases may lead to the holographic energy density if the latter recovers from the geometric mean of UV and IR scales. Hence the dark energy with infinite statistics based on the entropy bound is not an ingredient for deriving the holographic dark energy model. Furthermore, it is shown that the agegraphic dark energy models are the holographic dark energy model with different IR length scales.
description: 14 pages, version to appear in PLB
MONOS.II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
Creators: name: Páez, E. Trigueros
name: Barbá, R. H.
name: Negueruela, I.
name: Apellániz, J. Maíz
name: Simón-Díaz, S.
name: Holgado, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: [ABRIDGED] AIMS: The MONOS project is collecting information and studying O-type spectroscopic binaries with delta > -20 deg. In this 2nd paper, we tackle the study of the 35 single-line spectroscopic binary (SB1) systems identified in the previous paper of the series (arXiv:1904.11385) by analyzing our data and reviewing the literature orbits of such systems. METHODS: We have measured the radial velocities for the ~700 spectra in our database using two different methods: Gaussian fitting for several diagnostic lines per object and cross-correlation using synthetic spectra. We also explored the TESS database and analyzed the light curves for 31 of the systems. RESULTS: We have confirmed 21 SB1 systems, discarded the binary nature of 6 stars (9 Sge, HD 192 281, HDE 229 232 AB, 68 Cyg, HD 108 and αCam), and left 6 stars as inconclusive due to lack of data. The remaining two stars are 15 Mon Aa which has been classified as SB2, and Cyg OB2-22 C, for which we find evidence that it is most likely a triple system where the O star is orbiting an eclipsing SB1. We have also recalculated 20 new orbital solutions, including the first spectroscopic orbital solution for V747 Cep. For Cyg OB2-22 C we have obtained new ephemerides but no new orbit.
description: Table 10 and Appendix C are available at the CDS
Imaging a Coupled Quantum Dot - Quantum Point Contact System
Creators: name: Gildemeister, A. E.
name: Ihn, T.
name: Schleser, R.
name: Ensslin, K.
name: Driscoll, D. C.
name: Gossard, A. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We performed measurements on a quantum dot and a capacitively coupled quantum point contact by using the sharp metallic tip of a low-temperature scanning force microscope as a scanned gate. The quantum point contact served as a detector for charges on the dot or nearby. It allowed us to distinguish single electron charging events in several charge traps from charging events on the dot. We analyzed the tip-induced potential quantitatively and found its shape to be independent of the voltage applied to the tip within a certain range of parameters. We estimate that the trap density is below 0.1% of the doping density and that the interaction energy between the quantum dot and a trap is a significant portion of the dot's charging energy. Possibly, such charge traps are the reason for frequently observed parametric charge rearrangements.
description: 6 pages, 5 figures
Η Στρατηγική Επένδυσης σε Μετοχές Αξίας (Value Investing)
Creators: name: Καλαθά, Σοφία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Επένδυση στην αξία
Μετοχές
Companies
Value investing
Shares
Επιχειρήσεις

description: Στη σύγχρονη οικονομία, αποτελεί όλο και πιο συχνό φαινόμενο η διερεύνηση της πιο σωστής επενδυτικής στρατηγικής, η οποία θα αποφέρει τα μεγαλύτερα κέρδη στους επενδυτές. Στη συγκεκριμένη διπλωματική εργασία γίνεται, αρχικά, μία αναφορά στην επενδυτική διαδικασία, στις κατηγορίες των επενδυτών, καθώς και στους απαραίτητους δείκτες για την επιλογή της πιο αποτελεσματικής επενδυτικής στρατηγικής. Η πληθώρα των επενδυτικών στρατηγικών καθιστά επιτακτική την ανάγκη μελέτης και ανεύρεσης αυτής που μπορεί να αποφέρει τα καλύτερα αποτελέσματα. Η επένδυση στην αξία (Value Investing) είναι η στρατηγική που μελετάται λεπτομερώς στην παρούσα εργασία και επιπλέον, εφαρμόζεται και πρακτικά. Αποτελεί μία ολόκληρη φιλοσοφία επένδυσης και βασίζεται στη θεμελιώδη ανάλυση. Η συγκεκριμένη φιλοσοφία επένδυσης προήλθε από τον Benjamin Graham και αφορά την επιλογή μετοχών, των οποίων η εσωτερική τους αξία είναι μεγαλύτερη από τη χρηματιστηριακή τους τιμή. Η πρακτική εφαρμογή της στρατηγικής αυτής πραγματοποιείται στην αμερικάνικη εταιρία Illinois Toolworks Inc.
description: This study aims to analyze the investing procedure, the investing methods and the investors’ categories, in order to reach a conclusion for the best strategy for an investor. The method of Value Investing is the main strategy that I am analyzing at this study. Value investing is an investing philosophy, which comes from Benjamin Graham and Warren Buffet. It is about shares that their asset value is greater than their market price. In addition, there is, also, a case study of value investing at the American company Illinois Toolworks Inc, in order to be ascertained that it is a value investing company
Data Explorations in Firm Dynamics: Firm Birth, Life, and Death, Through Age, Wage, Size, and Labor
Creators: name: Shaheen, Joseph
Publisher: name: figshare
Year: 2021
Subjects: subject: 140215 Public Economics- Taxation and Revenue
subject: FOS: Economics and business
subject: 130203 Economics, Business and Management Curriculum and Pedagogy
subject: FOS: Educational sciences
subject: 140214 Public Economics- Publically Provided Goods
subject: 140213 Public Economics- Public Choice
subject: Economics
subject: 149999 Economics not elsewhere classified
subject: 140211 Labour Economics
subject: 140212 Macroeconomics (incl. Monetary and Fiscal Theory)
subject: 140299 Applied Economics not elsewhere classified

description: A better understanding of firm birth, life, and death yields a richer picture of firms' life-cycle and dynamical labor processes. Through "big data" analysis of a collection of universal fundamental distributions and beginning with firm age, wage and size, I discuss stationarity, their functional form, and consequences emanating from their defects. I describe and delineate the potential complications of the firm age defect caused by the Great Recession and speculate on a stark future where a single firm may control the U.S. economy. I follow with an analysis of firm sizes, tensions in heavy-tailed model fitting, how firm growth depends on firm size and consequently, the apparent conflict between empirical evidence and Gibrat's Law. Included is an introduction of the U.S. firm wage distribution. The ever-changing nature of firm dynamical processes played an important role in selecting the conditional distributions of age and size, and wage and size in my analysis. A closer look at these dynamical processes reveals the role played by mode wage and mode size in the dynamical processes of firms and thus in the firm life-cycle. Analysis of firm labor suggests preliminary evidence that the firm labor distribution conforms to scaling properties - that it is power law distributed. Moreover, I report empirical evidence supporting the existence of two separate and distinct labor processes dubbed labor regimes, a primary and secondary, coupled with a third unknown regime. I hypothesize that this unknown regime must be drawn from the primary labor regime that it is either emergent from systemic fraudulent activity or subjected to data corruption. The collection of explorations found in this dissertation product provide a fuller, richer picture of firm birth, life, and death through age, wage, size, and labor while supporting our understanding of firm dynamics in many directions.
Flat bidifferential ideals and semihamiltonian PDEs
Creators: name: Lorenzoni, Paolo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: In this paper we consider a class of semihamiltonian systems characterized by the existence of a special conservation law. The density and the current of this conservation law satisfy a second order system of PDEs which has a natural interpretation in the theory of flat bifferential ideals. The class of systems we consider contains important well-known examples of semihamiltonian systems. Other examples, like genus 1 Whitham modulation equations for KdV, are related to this class by a reciprocal trasformation.
description: 18 pages. v5: formula (36) corrected; minor changes
Study of the effect of the tensor correlation in oxygen isotopes with the charge- and parity-projected Hartree-Fock method
Creators: name: Sugimoto, Satoru
name: Ikeda, Kiyomi
name: Toki, Hiroshi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recently, we developed a mean-field-type framework which treats the correlation induced by the tensor force. To exploit the tensor correlation we introduce single-particle states with the parity and charge mixing. To make a total wave function have a definite charge number and a good parity, the charge number and parity projections are performed. Taking a variation of the projected wave function with respect to single-particle states a Hartree-Fock-like equation, the charge- and parity-projected Hartree-Fock equation, is obtained. In the charge- and parity-projected Hartree-Fock method, we solve the equation selfconsistently. In this paper we extend the charge- and parity-projected Hartree-Fock method to include a three-body force, which is important to reproduce the saturation property of nuclei in mean-field frameworks. We apply the charge- and parity-projected Hartree-Fock method to sub-closed-shell oxygen isotopes (14O, 16O, 22O, 24O, and 28O) to study the effect of the tenor correlation and its dependence on neutron numbers. We obtain reasonable binding energies and matter radii for these nuclei. It is found that relatively large energy gains come from the tensor force in these isotopes and there is the blocking effect by occupied neutron orbits on the tensor correlation.
Evolution of high-frequency gravitational waves in some cosmological models
Creators: name: Svitek, Otakar
name: Podolsky, Jiri
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate Isaacson's high-frequency gravitational waves which propagate in some relevant cosmological models, in particular the FRW spacetimes. Their time evolution in Fourier space is explicitly obtained for various metric forms of (anti--)de Sitter universe. Behaviour of high-frequency waves in the anisotropic Kasner spacetime is also described.
description: 14 pages, 8 figures, to appear in Czech. J. Phys
Advective collisions
Creators: name: Andersson, B.
name: Gustavsson, K.
name: Mehlig, B.
name: Wilkinson, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Small particles advected in a fluid can collide (and therefore aggregate) due to the stretching or shearing of fluid elements. This effect is usually discussed in terms of a theory due to Saffman and Turner [J. Fluid Mech., 1, 16-30, (1956)]. We show that in complex or random flows the Saffman-Turner theory for the collision rate describes only an initial transient (which we evaluate exactly). We obtain precise expressions for the steady-state collision rate for flows with small Kubo number, including the influence of fractal clustering on the collision rate for compressible flows. For incompressible turbulent flows, where the Kubo number is of order unity, the Saffman-Turner theory is an upper bound.
description: 4 pages, 1 figure
Poly-essential and general Hyperelastic World (brane) models
Creators: name: Carter, Brandon
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This article provides a unified treatment of an extensive category of non-linear classical field models whereby the universe is represented (perhaps as a brane in a higher dimensional background) in terms of a structure of a mathematically convenient type describable as hyperelastic, for which a complete set of equations of motion is provided just by the energy-momentum conservation law. Particular cases include those of a perfect fluid in quintessential backgrounds of various kinds, as well as models of the elastic solid kind that has been proposed to account for cosmic acceleration. It is shown how an appropriately generalised Hadamard operator can be used to construct a symplectic structure that controles the evolution of small perturbations, and that provides a characteristic equation governing the propagation of weak discontinuities of diverse (extrinsic and extrinsic) kinds. The special case of a poly-essential model - the k-essential analogue of an ordinary polytropic fluid - is examined and shown to be well behaved (like the fluid) only if the pressure to density ratio $w$ is positive.
description: 16 pages Latex, Contrib. to 10th Peyresq Pysics Meeting, June 2005: Micro and Macro Structures of Spacetime
Nuclear Schiff moment and soft vibrational modes
Creators: name: Zelevinsky, Vladimir
name: Volya, Alexander
name: Auerbach, Naftali
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The atomic electric dipole moment (EDM) currently searched by a number of experimental groups requires that both parity and time-reversal invariance be violated. According to current theoretical understanding, the EDM is induced by the nuclear Schiff moment. The enhancement of the Schiff moment by the combination of static quadrupole and octupole deformation was predicted earlier. Here we study a further idea of the possible enhancement in the absence of static deformation but in a nuclear system with soft collective vibrations of two types. Both analytical approximation and numerical solution of the simplified problem confirm the presence of the enhancement. We discuss related aspects of nuclear structure which should be studied beyond mean-field and random phase approximations.
description: 14 pages, 4 figures
Strong Triplet-Exciton-LO-Phonon Coupling in Two-Dimensional Layered Organic-Inorganic Hybrid Perovskite Single Crystal Microflakes
Creators: name: Wang, Yunuan
name: Song, Feilong
name: Yuan, Yu
name: Dang, Jianchen
name: Xie, Xin
name: Sun, Sibai
name: Yan, Sai
name: Lou, Yanbing Hou Zhidong
name: Xu, Xiulai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two-dimensional (2D) layered hybrid perovskites provide an ideal platform for studying the properties of excitons. Here, we report on a strong triplet-exciton and longitudinal-optical (LO) phonon coupling in 2D (C6H5CH2CH2NH3, PEA)2PbBr4 perovskites. The triplet excitons exhibit strong photoluminescence (PL) in thick perovskite microflakes, and the PL is not detectable for monolayer microflakes. The coupling strength of the triplet exciton-LO phonon is approximately two to three times greater than that of the singlet exciton-LO phonon with a LO phonon energy of about 21 meV. This difference might due to the different locations of singlet excitons located in the well and triplet excitons located in the barrier in the 2D layered perovskite. Revealing the strong coupling of triplet exciton-LO phonon provides a fundamental understanding of many-body interaction in hybrid perovskites, which is useful to develop and optimize the optoelectronic devices based on 2D perovskites in the future.
description: 22 pages, 5 figures
1/f fluctuations in spinning-particle motions around Schwarzschild black hole
Creators: name: Koyama, Hiroko
name: Kiuchi, Kenta
name: Konishi, Tetsuro
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study the properties of chaos in the motions of a spinning test particle in Schwarzschild spacetime. We characterize the chaos using the power spectrum of the time series of $z$ components of the particle's position. It is found that the pattern of the power spectrum shows not only white noise but also $1/f$-type fluctuation, depending on the value of the total angular momentum $J$ and the spin $S$ of the test particle. Therefore we succeed in classifying the chaotic motions, which have been classified as simply chaotic ones in former works, into the two distinct types. One is $1/f$, and the other is white noise. Based on this classification, we plot, in the two-dimensional parameter space $(J,S)$, the phase diagram for the properties of the chaos. This phase diagram enables us in principle to guess the properties of the system $(J,S)$ by observing the dynamics of the test particle, even if the motion is chaotic. Furthermore, we detect that the origin of the $1/f$ fluctuation is that the particle motion stagnates around regular orbits (tori), while traveling back and forth between them, which is called ``stagnant motion'' or ``sticky motion'' in Hamiltonian dynamical systems. The point is that the difference of the property of the chaos or the power spectra is due to the topological structure of the phase space, which in turn is governed by the physical parameter set $(J,S)$ of the system. From this point of view, the chaos we found in this system is not always merely random.
description: 14 pages, 22 figures, submitted to PRD, revised version
Loss-tolerant concatenated Bell-state measurement with encoded coherent-state qubits for long-range quantum communication
Creators: name: Lee, Seok-Hyung
name: Lee, Seung-Woo
name: Jeong, Hyunseok
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The coherent-state qubit is a promising candidate for optical quantum information processing due to its nearly-deterministic nature of the Bell-state measurement (BSM). However, its non-orthogonality incurs difficulties such as failure of the BSM. One may use a large amplitude ($α$) for the coherent state to minimize the failure probability, but the qubit then becomes more vulnerable to dephasing by photon loss. We propose a hardware-efficient concatenated BSM (CBSM) scheme with modified parity encoding using coherent states with reasonably small amplitudes ($|α| \lessapprox 2$), which simultaneously suppresses both failures and dephasing in the BSM procedure. We numerically show that the CBSM scheme achieves a success probability arbitrarily close to unity for appropriate values of $α$ and sufficiently low photon loss rates (e.g., $\lessapprox 5\%$). Furthermore, we verify that the quantum repeater scheme exploiting the CBSM scheme for quantum error correction enables one to carry out efficient long-range quantum communication over 1000 km. We show that the performance is comparable to those of other up-to-date methods or even outperforms them for some cases. Finally, we present methods to prepare logical qubits under modified parity encoding and implement elementary logical operations, which consist of several physical-level ingredients such as generation of Schrödinger's cat state and elementary gates under coherent-state basis. Our work demonstrates that the encoded coherent-state qubits in free-propagating fields provide an alternative route to fault-tolerant information processing, especially long-range quantum communication.
description: 25 pages, 11 figures
A quantitative version of the idempotent theorem in harmonic analysis
Creators: name: Green, Ben
name: Sanders, Tom
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: Suppose that G is a locally compact abelian group, and write M(G) for the algebra of bounded, regular, complex-valued measures under convolution. A measure μin M(G) is said to be idempotent if μ* μ= μ, or alternatively if the Fourier-Stieltjes transform μ^ takes only the values 0 and 1. The Cohen-Helson-Rudin idempotent theorem states that a measure μis idempotent if and only if the set {r in G^ : μ^(r) = 1} belongs to the coset ring of G^, that is to say we may write μ^ as a finite plus/minus 1 combination of characteristic functions of cosets r_j + H_j, where the H_j are open subgroups of G^. In this paper we show that the number L of such cosets can be bounded in terms of the norm ||μ||, and in fact one may take L <= \exp\exp(C||μ||^4). In particular our result is non-trivial even for finite groups.
description: 28 pages
Learning Skill Equivalencies Across Platform Taxonomies
Creators: name: Li, Zhi
name: Ren, Cheng
name: Li, Xianyou
name: Pardos, Zachary A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Assessment and reporting of skills is a central feature of many digital learning platforms. With students often using multiple platforms, cross-platform assessment has emerged as a new challenge. While technologies such as Learning Tools Interoperability (LTI) have enabled communication between platforms, reconciling the different skill taxonomies they employ has not been solved at scale. In this paper, we introduce and evaluate a methodology for finding and linking equivalent skills between platforms by utilizing problem content as well as the platform's clickstream data. We propose six models to represent skills as continuous real-valued vectors and leverage machine translation to map between skill spaces. The methods are tested on three digital learning platforms: ASSISTments, Khan Academy, and Cognitive Tutor. Our results demonstrate reasonable accuracy in skill equivalency prediction from a fine-grained taxonomy to a coarse-grained one, achieving an average recall@5 of 0.8 between the three platforms. Our skill translation approach has implications for aiding in the tedious, manual process of taxonomy to taxonomy mapping work, also called crosswalks, within the tutoring as well as standardized testing worlds.
description: Accepted to Learning Analytics and Knowledge (LAK-2021)