cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Automated construction of quantum-classical hybrid models
Creators: name: Brunken, Christoph
name: Reiher, Markus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Biological Physics (physics.bio-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a protocol for the fully automated construction of quantum mechanical-(QM)-classical hybrid models by extending our previously reported approach on self-parametrizing system-focused atomistic models (SFAM) J. Chem. Theory Comput. 2020, 16, 1646]. In this QM/SFAM approach, the size and composition of the QM region is evaluated in an automated manner based on first principles so that the hybrid model describes the atomic forces in the center of the QM region accurately. This entails the automated construction and evaluation of differently sized QM regions with a bearable computational overhead that needs to be paid for automated validation procedures. Applying SFAM for the classical part of the model eliminates any dependence on pre-existing parameters due to its system-focused quantum mechanically derived parametrization. Hence, QM/SFAM is capable of delivering a high fidelity and complete automation. Furthermore, since SFAM parameters are generated for the whole system, our ansatz allows for a convenient re-definition of the QM region during a molecular exploration. For this purpose, a local re-parametrization scheme is introduced, which efficiently generates additional classical parameters on the fly when new covalent bonds are formed (or broken) and moved to the classical region.
description: 38 pages, 9 figures
Antibacterial effect of silver nanoparticles synthesised on a polycarbonate membrane
Creators: name: Ntwampe, Seteno Karabo Obed
Publisher: name: figshare
Year: 2021
Subjects: subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: FOS: Chemical sciences

description: This work reports for the first time the possibility of green synthesis and the antibacterial effect of silvernanoparticles (AgNPs) on commercialized polycarbonate membrane. The AgNPs were loaded on the polycarbonatemembrane serving as the substrate via ultra-sonication and centrifugation. The extracts fromthe red flowers of Callistemon viminalis were used as the chelating agent. The synthesised thin film silvernanoparticles were characterized by various techniques such as Scanning Electron Microscope (SEM),Energy Dispersive X-ray spectroscopy (EDX), Fourier transform-infrared (FT-IR), X-Ray diffraction andUV–Vis spectroscopy. Consequently, the antibacterial affect was studied. The synthesised thin film silvernanoparticles had a surface plasmon resonance of 310nmand show a very effective inhibition growth ofboth Gram-positive and Gram-negative.
Single photon randomness originating from the symmetry of dipole emission and the unpredictability of spontaneous emission
Creators: name: Hoese, Michael
name: Koch, Michael K.
name: Breuning, Felix
name: Lettner, Niklas
name: Fehler, Konstantin G.
name: Kubanek, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum random number generation is a key ingredient for quantum cryptography and fundamental quantum optics and could advance Monte-Carlo simulations and machine learning. An established generation scheme is based on single photons impinging on a beam splitter. Here, we experimentally demonstrate quantum random number generation solely based on the spontaneous emission process in combination with the symmetric emission profile of a dipole aligned orthogonal to the laboratory frame. The demonstration builds on defect centers in hexagonal boron nitride and benefits from the ability to manipulate and align the emission directionality. We prove the randomness in the correlated photon detection events making use of the NIST randomness test suite and show that the randomness remains for two independently emitting defect centers. The scheme can be extended to random number generation by coherent single photons with potential applications in solid-state based quantum communication at room temperature.
description: 7 pages, 4 figures
Bright solitons and soliton trains in a fermion-fermion mixture
Creators: name: Adhikari, Sadhan K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We use a time-dependent dynamical mean-field-hydrodynamic model to predict and study bright solitons in a degenerate fermion-fermion mixture in a quasi-one-dimensional cigar-shaped geometry using variational and numerical methods. Due to a strong Pauli-blocking repulsion among identical spin-polarized fermions at short distances there cannot be bright solitons for repulsive interspecies fermion-fermion interactions. However, stable bright solitons can be formed for a sufficiently attractive interspecies interaction. We perform a numerical stability analysis of these solitons and also demonstrate the formation of soliton trains. These fermionic solitons can be formed and studied in laboratory with present technology.
description: 5 pages, 7 figures
Natural Inflation: status after WMAP 3-year data
Creators: name: Savage, Christopher
name: Freese, Katherine
name: Kinney, William H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The model of Natural Inflation is examined in light of recent 3-year data from the Wilkinson Microwave Anisotropy Probe and shown to provide a good fit. The inflaton potential is naturally flat due to shift symmetries, and in the simplest version takes the form $V(ϕ) = Λ^4 [1 \pm \cos(Nϕ/f)]$. The model agrees with WMAP3 measurements as long as $f > 0.7 m_{Pl}$ (where $m_{Pl} = 1.22 \times 10^{19}$GeV) and $Λ\sim m_{GUT}$. The running of the scalar spectral index is shown to be small -- an order of magnitude below the sensitivity of WMAP3. The location of the field in the potential when perturbations on observable scales are produced is examined; for $f > 5 m_{Pl}$, the relevant part of the potential is indistinguishable from a quadratic, yet has the advantage that the required flatness is well-motivated. Depending on the value of $f$, the model falls into the large field ($f \ge 1.5 m_{Pl}$) or small field ($f < 1.5 m_{Pl}$) classification scheme that has been applied to inflation models. Natural inflation provides a good fit to WMAP3 data.
description: 9 pages, 8 figures. v2: Added references and minor revisions. Submitted to PRD
How continuous quantum measurements in finite dimension are actually discrete
Creators: name: Chiribella, G.
name: D'Ariano, G. M.
name: Schlingemann, D. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that in finite dimension a quantum measurement with continuous set of outcomes is always equivalent to a continuous random choice of measurements with only finite outcomes.
description: 4 pages, 1 figure
Grammatical elicitation: Verb paradigms
Creators: name: Palacio, Frank
name: Björklund, Anna
name: Dabkowski, Maksymilian
name: Elias, Alexander
name: López Márquez, Wendy
name: Michael, Lev
name: Montaño Ramírez, Tzintia
name: Robertson, Allegra
name: Robinson, Dakota
name: Wellstood, Zachary
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: cab

description: Covers stative and active intransitive, transitive, and ditransitive verbs in non-progressive and progressive past contexts. Verbs are elicited with positive and negative polarity, and in declarative, interrogative, and directive moods.
Μελέτη απόδοσης αλγορίθμων για ενεργειακά αποδοτική λειτουργία οπτικών δικτύων κορμού
Creators: name: Παπάς, Κωνσταντίνος Ευάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Αναπροσαρμογή εικονικής τοπολογίας
Ενεργειακή αποδοτικότητα
Οπτικά δίκτυα κορμού
Virtual topology reconfiguration
Energy efficiency
Backbone optical networks

description: Σε αυτή τη μελέτη παρουσιάζεται η λειτουργία αλγορίθμων που έχουν σαν στόχο να εξοικονομήσουν ενέργεια σε οπτικά δίκτυα κορμού. Αρχικά, η αναδιαμόρφωση της εικονικής τοπολογίας γίνεται με τη χρήση δύο κατωφλίων σαν ελεγκτικός μηχανισμός, ο οποίος φροντίζει ο φόρτος των οπτικών μονοπατιών να κυμαίνεται ανάμεσα σε αυτές τις τιμές των κατωφλίων. Μονοπάτια των οποίων ο φόρτος είναι χαμηλότερος από το κάτω κατώφλι απενεργοποιούνται. Παρομοίως, αυτά που είναι φορτωμένα περισσότερο από το πάνω κατώφλι επιβάλλουν τη δημιουργία ενός νέου προς αποφυγή συμφόρησης. Στη συνέχεια εισάγεται η λειτουργία page ranking, η οποία χρησιμοποιείται σαν εργαλείο κατά τη διαδικασία της αναδιαμόρφωσης της εικονικής τοπολογίας σε οπτικά δίκτυα κορμού, πετυχαίνοντας επιπλέον εξοικονόμηση ενέργειας.
description: In this study the operation of algorithms that aim to save amounts of energy in backbone optical networks is presented. Initially, the virtual topology reconfiguration problem is approached using tow thresholds, to control the network traffic and make the traffic rates fluctuate between those two thresholds. Optical paths with load lower than the low threshold are deleted, while overloaded paths lead to the creation of new lightpaths to avoid congestion. Finally the page rank operation is being involved and used as a tool to the virtual topology reconfiguration procedure in backbone optical networks, obtaining further energy consumption reduction.
Quantum key distribution with triggering parametric down conversion sources
Creators: name: Ma, Xiongfeng
name: Lo, Hoi-Kwong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Parametric down-conversion (PDC) sources can be used for quantum key distribution (QKD). One can use a PDC source as a triggered single photon source. Recently, there are various practical proposals of the decoy state QKD with triggering PDC sources. In this paper, we generalize the passive decoy state idea, originally proposed by Mauerer and Silberhorn. The generalized passive decoy state idea can be applied to cases where either threshold detectors or photon number resolving detectors are used. The decoy state protocol proposed by Adachi, Yamamoto, Koashi and Imoto (AYKI) can be treated as a special case of the generalized passive decoy state method. By simulating a recent PDC experiment, we compare various practical decoy state protocols with the infinite decoy protocol and also compare the cases using threshold detectors and photon-number resolving detectors. Our simulation result shows that with the AYKI protocol, one can achieve a key generation rate that is close to the theoretical limit of infinite decoy protocol. Furthermore, our simulation result shows that a photon-number resolving detector appears to be not very useful for improving QKD performance in this case. Although our analysis is focused on the QKD with PDC sources, we emphasize that it can also be applied to other QKD setups with triggered single photon sources.
Magnetic-Field Induced Gap in One-Dimensional Antiferromagnet KCuGaF$_6$
Creators: name: Morisaki, R.
name: Ono, T.
name: Tanaka, H.
name: Uekusa, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic susceptibility and specific heat measurements in magnetic fields were performed on an $S=1/2$ one-dimensional antiferromagnet KCuGaF$_6$. Exchange interaction was evaluated as $J/k_{\rm B}\simeq 100$ K. However, no magnetic ordering was observed down to 0.46 K. It was found that an applied magnetic field induces a staggered magnetic susceptibility obeying the Curie law and an excitation gap, both of which should be attributed to the antisymmetric interaction of the Dzyaloshinsky-Moriya type and/or the staggered $g$-tensor. With increasing magnetic field $H$, the gap increases almost in proportion to $H^{2/3}$.
description: Submitted to Proceedings of Research in High Magnetic Field
Low power in-situ AI Calibration of a 3 Axial Magnetic Sensor
Creators: name: Alimi, Roger
name: Fisher, Elad
name: Ivry, Amir
name: Shavit, Alon
name: Weiss, Eyal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Signal Processing (eess.SP)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Magnetic surveys are conventionally performed by scanning a domain with a portable scalar magnetic sensor. Unfortunately, scalar magnetometers are expensive, power consuming and bulky. In many applications, calibrated vector magnetometers can be used to perform magnetic surveys. In recent years algorithms based on artificial intelligence (AI) achieve state-of-the-art results in many modern applications. In this work we investigate an AI algorithm for the classical scalar calibration of magnetometers. A simple, low cost method for performing a magnetic survey is presented. The method utilizes a low power consumption sensor with an AI calibration procedure that improves the common calibration methods and suggests an alternative to the conventional technology and algorithms. The setup of the survey system is optimized for quick deployment in-situ right before performing the magnetic survey. We present a calibration method based on a procedure of rotating the sensor in the natural earth magnetic field for an optimal time period. This technique can deal with a constant field offset and non-orthogonality issues and does not require any external reference. The calibration is done by finding an estimator that yields the calibration parameters and produces the best geometric fit to the sensor readings. A comprehensive model considering the physical, algorithmic and hardware properties of the magnetometer of the survey system is presented. The geometric ellipsoid fitting approach is parametrically tested. The calibration procedure reduced the root-mean-squared noise from the order of 104 nT to less than 10 nT with variance lower than 1 nT in a complete 360 degrees rotation in the natural earth magnetic field.
description: Accepted to IEEE Transactions On Magnetics
The Carbon-Rich Gas in the Beta Pictoris Circumstellar Disk
Creators: name: Roberge, Aki
name: Feldman, Paul D.
name: Weinberger, Alycia J.
name: Deleuil, Magali
name: Bouret, Jean-Claude
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The edge-on disk surrounding the nearby young star Beta Pictoris is the archetype of the "debris disks", which are composed of dust and gas produced by collisions and evaporation of planetesimals, analogues of Solar System comets and asteroids. These disks provide a window on the formation and early evolution of terrestrial planets. Previous observations of Beta Pic concluded that the disk gas has roughly solar abundances of elements [1], but this poses a problem because such gas should be rapidly blown away from the star, contrary to observations of a stable gas disk in Keplerian rotation [1, 2]. Here we report the detection of singly and doubly ionized carbon (CII, CIII) and neutral atomic oxygen (OI) gas in the Beta Pic disk; measurement of these abundant volatile species permits a much more complete gas inventory. Carbon is extremely overabundant relative to every other measured element. This appears to solve the problem of the stable gas disk, since the carbon overabundance should keep the gas disk in Keplerian rotation [3]. New questions arise, however, since the overabundance may indicate the gas is produced from material more carbon-rich than the expected Solar System analogues.
description: Accepted for publication in Nature. PDF document, 12 pages. Supplementary information may be found at http://www.dtm.ciw.edu/akir/Documents/roberge_supp.pdf *** Version 2 : Removed extraneous publication information, per instructions from the Nature editor. No other changes made
Coarse-graining and symplectic non-squeezing
Creators: name: Kalogeropoulos, Nikolaos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We address aspects of coarse-graining in classical Statistical Physics from the viewpoint of the symplectic non-squeezing theorem. We make some comments regarding the implications of the symplectic non-squeezing theorem for the BBGKY hierarchy. We also see the cubic cells appearing in coarse-graining as a direct consequence of the uniqueness of Hofer's metric on the group of Hamiltonian diffeomorphisms of the phase space.
description: 22 pages, No figures, Standard LaTeX2e
On the parameters of the Kerr-NUT-(anti-)de Sitter space-time
Creators: name: Griffiths, J. B.
name: Podolsky, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Different forms of the metric for the Kerr-NUT-(anti-)de Sitter space-time are being widely used in its extension to higher dimensions. The purpose of this note is to relate the parameters that are being used to the physical parameters (mass, rotation, NUT and cosmological constant) in the basic four dimensional situation.
description: 4 pages. To appear as a Note in Classical and Quantum Gravity
Standardized long gamma-ray bursts as a cosmic distance indicator
Creators: name: Wang, F. Y.
name: Hu, J. P.
name: Zhang, G. Q.
name: Dai, Z. G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gamma-ray bursts (GRBs) are the most luminous explosions and can be detectable out to the edge of Universe. It has long been thought they can extend the Hubble diagram to very high redshifts. Several correlations between temporal or spectral properties and GRB luminosities have been proposed to make GRBs cosmological tools. However, those correlations cannot be properly standardized. In this paper, we select a long GRB sample with X-ray plateau phases produced by electromagnetic dipole emissions from central new-born magnetars. A tight correlation is found between the plateau luminosity and the end time of the plateau in X-ray afterglows out to the redshift $z=5.91$. We standardize these long GRBs X-ray light curves to a universal behavior by this correlation for the first time, with a luminosity dispersion of 0.5 dex. The derived distance-redshift relation of GRBs is in agreement with the standard $Λ$CDM model both at low and high redshifts. The evidence of accelerating universe from this GRB sample is $3σ$, which is the highest statistical significance from GRBs to date.
description: 14 pages, 6 figures, 1 table, main results are shown in Figures 3, 4 and 5, submitted to ApJ
The effects of degree correlations on network topologies and robustness
Creators: name: Zhao, Jing
name: Tao, Lin
name: Yu, Hong
name: Luo, Jian-Hua
name: Cao, Zhi-Wei
name: Li, Yi-Xue
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Complex networks have been applied to model numerous interactive nonlinear systems in the real world. Knowledge about network topology is crucial for understanding the function, performance and evolution of complex systems. In the last few years, many network metrics and models have been proposed to illuminate the network topology, dynamics and evolution. Since these network metrics and models derive from a wide range of studies, a systematic study is required to investigate the correlations between them. The present paper explores the effect of degree correlation on the other network metrics through studying an ensemble of graphs where the degree sequence (set of degrees) is fixed. We show that to some extent, the characteristic path length, clustering coefficient, modular extent and robustness of networks are directly influenced by the degree correlation.
description: 13 pages, 6 figures
Upper Bounds on the Automorphism Group of a Graph
Creators: name: Krasikov, Ilia
name: Lev, Arie
name: Thatte, Bhalchandra D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C60

description: We give upper bounds on the order of the automorphism group of a simple graph
description: 6 pages
Adoption reunion and the experience of the adoptive parents : an exploratory study
Creators: name: Travers, Annemarie Gerarda
Publisher: name: University of British Columbia
Year: 2008

description: Adoption policy, practice and law are undergoing rapid change in British Columbia. One of the recent changes has been the establishment of an adoption reunion registry allowing birth parents and adoptees to become reacquainted. Studies of adoption reunion have focused primarily on the experience from the perspective of the adoptee or birth parent. There has been little attention given, to date, to the adoptive parents' experiences when their son or daughter has reunited with a birth parent. At the same time, there have been many assumptions made regarding adoptive parents' reactions to adoption reunion. This exploratory study was intended to examine the positive and negative experiences of adoptive parents, whose adult son or daughter had recently reunited with his/her birth parent(s). However, only adoptive parents who were supportive of the reunion came forward to be interviewed. Seven sets of adoptive parents, recruited through the Adoption Reunion registry, were interviewed and a qualitative design was used to identify commonalities in the experiences of these adoptive parents. The adoptive parents demonstrated an open attitude to adoption through their family legends, their willingness to extend their definition of family, and their recognition of their son/daughter's multiple belonging. Of particular interest in the findings is a developmental component, which suggests that the experience of reunion varies for adoptive parents depending on their developmental stage and that of their adult child.
Complex impedance of TESs under AC bias using FDM readout system
Creators: name: Taralli, E.
name: Khosropanah, P.
name: Gottardi, L.
name: Nagayoshi, K.
name: Ridder, M. L.
name: Bruijn, M. P.
name: Gao, J. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The next generation of Far-infrared and X-ray space observatories will require detector arrays with thousands of transition edge sensor (TES) pixel. It is extremely important to have a tool that is able to characterize all the pixels and that can give a clear picture of the performance of the devices. In particular, we refer to those aspects that can affect the global energy resolution of the array: logarithmic resistance sensitivity with respect to temperature and current ($α$ and $β$ parameters, respectively), uniformity of the TESs and the correct understanding of the detector thermal model. Complex impedance measurement of a TES is the only technique that can give all this information at once, but it has been established only for a single pixel under DC bias. We have developed a complex impedance measurement method for TESs that are AC biased since we are using a MHz frequency domain multiplexing (FDM) system to readout an array. We perform a complete set of AC impedance measurements for different X-ray TES microcalorimeters based on superconducting TiAu bilayers with or without normal metal Au bar structures. We discuss the statistical analysis of the residual between impedance data and fitting model to determine the proper calorimeter thermal model for our detectors. Extracted parameters are used to improve our understanding of the differences and capabilities among the detectors and additionally the quality of the array. Moreover, we use the results to compare the calculated noise spectra with the measured data.
Finitary Group Cohomology and Eilenberg-Mac Lane Spaces
Creators: name: Hamilton, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 20J06; 55P20; 18A22

description: We say that a group G has cohomology almost everywhere finitary if and only if the nth cohomology functors of G commute with filtered colimits for all sufficiently large n. In this paper, we show that if G is a group in Kropholler's class LHF with cohomology almost everywhere finitary, then G has an Eilenberg--Mac Lane space K(G,1) which is dominated by a CW-complex with finitely many n-cells for all sufficiently large n. It is an open question as to whether this holds for arbitrary G. We also remark that the converse holds for any group G.
description: 17 pages
Mott Transitions and d-wave Superconductivity in Half-Filled-Band Hubbard Model on Square Lattice with Geometric Frustration
Creators: name: Yokoyama, Hisatoshi
name: Ogata, Masao
name: Tanaka, Yukio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Mechanisms of Mott transitions and dx2-y2-wave superconductivity (SC) are studied in the half-filled-band Hubbard model on square lattices with a diagonal hopping term (t'), using an optimization (or correlated) variational Monte Carlo method. In the trial wave functions, a doublon-holon binding effect is introduced in addition to the onsite Gutzwiller projection. We mainly treat a d-wave singlet state and a projected Fermi sea. In both wave functions, first-order Mott transitions without direct relevance to magnetic orders take place at U=Uc approximately of the bandwidth for arbitrary t'/t. These transitions originate in the binding or unbinding of a doublon to a holon. d-wave SC appears in a narrow range immediately below Uc. The robust d-wave superconducting correlation are necessarily accompanied by enhanced antiferromagnetic correlation; the strength of SC becomes weak, as t'/t increases.
description: 18 pages, 30 figures
A multiexcitonic quantum dot in an optical microcavity
Creators: name: Vinck, Herbert
name: Rodriguez, Boris A.
name: Gonzalez, Augusto
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically study the coupled modes of a medium-size quantum dot, which may confine a maximum of ten electron-hole pairs, and a single photonic mode of an optical microcavity. Ground-state and excitation energies, exciton-photon mixing in the wave functions and the emission of light from the microcavity are computed as functions of the pair-photon coupling strength, photon detuning, and polariton number.
description: 4 pages, 4 figs
Οι βασικές θέσεις της πλατωνικής Θεωρίας των Ιδεών και η κριτική του Αριστοτέλη
Creators: name: Κατσούλη, Παρασκευή Οδυσσέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Πλατωνική Θεωρία των Ιδεών
Πλατωνική Οντολογία
Κριτική του Αριστοτέλη στον Πλάτωνα
Platonic Theory of Ideas
Platonic Ontology
Criticism of Aristotle to Plato

description: Σκοπός της διατριβής ήταν η μελέτη των βασικών χαρακτηριστικών της πλατωνικής Θεωρίας των Ιδεών, καθώς και η υπογράμμιση των πιο καίριων σημείων της, των οποίων το περιεχόμενο δέχτηκε την κριτική του Αριστοτέλη. Αρχικά, παρουσιάστηκαν επιγραμματικά οι κύριες οντολογικές αντιλήψεις που εκφράστηκαν πριν τον Πλάτωνα. Στη συνέχεια κάνοντας μια σύντομη αναφορά στον τρόπο εμφάνισης της Ιδέας στους πρώιμους πλατωνικούς διαλόγους, προχωρήσαμε στην παρουσίαση της βαθμιαίας εξέλιξης της έννοιας της. Αναφερθήκαμε αναλυτικά στη διαμόρφωση της έννοιας της Ιδέας στους μέσους διαλόγους, έχοντας ως παράδειγμα τους διαλόγους του Φαίδωνα και της Πολιτείας, στην πορεία προχωρήσαμε στους μεταβατικούς, τον Παρμενίδη και τον Θεαίτητο, και καταλήξαμε στους ύστερους, έχοντας ως γνώμονα το διάλογο του Σοφιστή και του Φίληβου. Τέλος, ένα ακόμη θέμα που θίξαμε ήταν η κριτική που άσκησε ο Αριστοτέλης στη θεωρία του δασκάλου του και τις ατέλειες που ο ίδιος εντόπισε, όπως αυτές παρουσιάζονται στο Α Βιβλίο των Μετά τα Φυσικά.
description: The aim of the thesis was to access the essential characteristics of the Platonic Theory of Ideas, as well as highlighting the most critical points of, whose content was accepted the criticism of Aristotle. Initially, briefly presented the main ontological conceptions expressed before Plato. Then making a brief reference to the way of the Idea in the early Platonic dialogues, we proceeded with the presentation of the gradual evolution of the concept. We discussed in detail the formation of the concept of the Idea in the middle dialogues, having as example the dialogue of Phaedo and Politeia, on course we proceeded to intermediate dialogues, Parmenides and Theaetetus, and we came to late, having guided the dialogue of Sophist and Philebus. Finally, another issue which we discussed was the criticism of Aristotle to Plato and the imperfections that he spotted, as shown in Metaphysics book Alpha.
Software startup education: gamifying growth hacking
Creators: name: Kemell, Kai-Kristian
name: Feshchenko, Polina
name: Himmanen, Joonas
name: Hossain, Abrar
name: Jameel, Furqan
name: Puca, Raffaele Luigi
name: Vitikainen, Teemu
name: Kultanen, Joni
name: Risku, Juhani
name: Impiö, Johannes
name: Sorvisto, Anssi
name: Abrahamsson, Pekka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Startups seek to create highly scalable business models. For startups, growth is thus vital. Growth hacking is a marketing strategy advocated by various startup practitioner experts. It focuses on using low cost practices while utilizing existing platforms in creative ways to gain more users for the service. Though topics related to growth hacking such as marketing on a general level have been extensively studied in the past, growth hacking as a practitioner-born topic has not seen much interesting among the academia. To both spark interest in growth hacking, and to facilitate teaching growth hacking in the academia, we present two board games intended to serve as an engaging introduction to growth hacking for students.
Quantum logic via the exchange blockade in ultracold collisions
Creators: name: Hayes, David
name: Julienne, Paul
name: Deutsch, Ivan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A nuclear spin can act as a quantum switch that turns on or off ultracold collisions between atoms even when there is neither interaction between nuclear spins nor between the nuclear and electron spins. This "exchange blockade" is a new mechanism for implementing quantum logic gates that arises from the symmetry of composite identical particles, rather than direct coupling between qubits. We study the implementation of the entangling $\sqrt{\text{SWAP}}$ gate based on this mechanism for a model system of two atoms with ground electron configuration $^1S_0$, spin 1/2 nuclei, trapped in optical tweezers. We evaluate a proof-of-principle protocol based on adiabatic evolution of a one dimensional double Gaussian well, calculating fidelities of operation as a function of interaction strength, gate time, and temperature.
Bio-synthesis and characterization of nanoscaled CdO using corn husk extract via green nano-chemistry
Creators: name: Ntwampe, Seteno Karabo Obed
Publisher: name: figshare
Year: 2021
Subjects: subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: FOS: Chemical sciences

description: Cadmium oxide (CdO) nanoparticles were synthesized for the first time via an eco-friendly, simple andcost effective green synthesis method mediated by corn husk extract. Indeed, the corn husk extract actedas an effective chelating agent in facilitating the formation of the CdO nanoparticles. XRD analysis confirmedthe formation of highly crystalline face-centred cubic CdO nanoparticles. The structural morphologyand the constituents of the resultant CdO nanoparticles were investigated by High Resolution –Scanning Electron Microscopy (HR-SEM) and Energy Dispersive X- rays Spectroscopy (EDS). AttenuatedTotal Reflection – Fourier Transformer Infrared spectroscopy (ATR-FTIR) and Raman spectroscopy measurementshave been obtained to complete the structural investigation. UV – Visible spectroscopy analysisshowed a wide absorbance spectral range of 250 – 2500 nm. Consequently, the CdO nanoparticledisplayed photoluminescence emission peak at 508 nm.
Shift of Infrared Absorption and Emission Spectra of Transition Metal Ions in Solid Solutions of Semiconductor Compounds
Creators: name: Naydenov, S. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A universal theoretical model is proposed that explains the observed shift of IR absorption and emission bands in the spectra of transition metal ions in solid solutions of semiconductor compounds. The model has been used for estimating the long-wavelength shift of luminescence bands in the spectra of semiconductor solid solutions with increasing concentration in application to crystals of the ternary systems ZnMgSe(Cr2+) and CdMnTe(Fe2+). Description of the phenomenon is generalized to the case of multicomponent solid solutions.
Search for associated Higgs boson production WH->WWW*->l+-nu l'+-nu'+X in p-pbar collisions at sqrt(s)=1.96 TeV
Creators: name: D0 Collaboration
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a search for associated Higgs boson production in the process $p\bar{p} \to WH\to WWW^*\to l^\pmνl'^\pmν'+X$ in final states containing two like-sign isolated electrons or muons ($e^\pm e^\pm$, $e^\pm μ^\pm$, or $μ^\pm μ^\pm$). The search is based on D0 Run II data samples corresponding to integrated luminosities of 360--380 pb$^{-1}$. No excess is observed over the predicted standard model background. We set 95% C.L. upper limits on $σ(p\bar{p}\to WH)\times Br(H\to WW^*)$ between 3.2 and 2.8 pb for Higgs masses from 115 to 175 GeV.
description: 7 pages, 3 figures, Published in Phys. Rev. Lett. Minor changes in v2 to match the published version
PeCoQ: A Dataset for Persian Complex Question Answering over Knowledge Graph
Creators: name: Etezadi, Romina
name: Shamsfard, Mehrnoush
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Question answering systems may find the answers to users' questions from either unstructured texts or structured data such as knowledge graphs. Answering questions using supervised learning approaches including deep learning models need large training datasets. In recent years, some datasets have been presented for the task of Question answering over knowledge graphs, which is the focus of this paper. Although many datasets in English were proposed, there have been a few question-answering datasets in Persian. This paper introduces \textit{PeCoQ}, a dataset for Persian question answering. This dataset contains 10,000 complex questions and answers extracted from the Persian knowledge graph, FarsBase. For each question, the SPARQL query and two paraphrases that were written by linguists are provided as well. There are different types of complexities in the dataset, such as multi-relation, multi-entity, ordinal, and temporal constraints. In this paper, we discuss the dataset's characteristics and describe our methodology for building it.
description: 5 pages, 4 figures
The Most Massive Black Holes in the Universe: Effects of Mergers in Massive Galaxy Clusters
Creators: name: Yoo, Jaiyul
name: Miralda-Escude, Jordi
name: Weinberg, David H.
name: Zheng, Zheng
name: Morgan, Christopher W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent observations support the idea that nuclear black holes grew by gas accretion while shining as luminous quasars at high redshift, and they establish a relation of the black hole mass with the host galaxy's spheroidal stellar system. We develop an analytic model to calculate the expected impact of mergers on the masses of black holes in massive clusters of galaxies. We use the extended Press-Schechter formalism to generate Monte Carlo merger histories of halos with a mass 10^{15} h^{-1} Msun. We assume that the black hole mass function at z=2 is similar to that inferred from observations at z=0 (since quasar activity declines markedly at z<2), and we assign black holes to the progenitor halos assuming a monotonic relation between halo mass and black hole mass. We follow the dynamical evolution of subhalos within larger halos, allowing for tidal stripping, the loss of orbital energy by dynamical friction, and random orbital perturbations in gravitational encounters with subhalos, and we assume that mergers of subhalos are followed by mergers of their central black holes. Our analytic model reproduces numerical estimates of the subhalo mass function. We find that the most massive black holes in massive clusters typically grow by a factor ~ 2 by mergers after gas accretion has stopped. In our ten realizations of 10^{15} h^{-1} Msun clusters, the highest initial (z=2) black hole masses are 5-7 x 10^9 Msun, but four of the clusters contain black holes in the range 1-1.5 x 10^{10} Msun at z=0. Satellite galaxies may host black holes whose mass is comparable to, or even greater than, that of the central galaxy. Thus, black hole mergers can significantly extend the very high end of the black hole mass function.
description: 13 pages, 7 figures, accepted for publication in The Astrophysical Journal
Tau Physics 2006: Summary & Outlook
Creators: name: Pich, Antonio
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A large amount of new results have been presented at TAU2006. The highlights of the workshop, the present status of a few selected topics on lepton physics (universality, QCD tests, V_{us} determination from tau decay, g-2, neutrino oscillations, lepton-flavour violation) and the prospects for future improvements are briefly summarized.
description: Conference Summary at the 9th International Workshop on Tau Lepton Physics (TAU06), 19-22 September 2006, Pisa (Italy)
Characterization of high aspect ratio TiAu TES X-ray microcalorimeters array using the X-IFU Frequency Domain Multiplexing readout
Creators: name: Taralli, E.
name: Gottardi, L.
name: Nagayoshi, K.
name: Ridder, M.
name: Visser, S.
name: Khosropanah, P.
name: Akamatsu, H.
name: van der Kuur, J.
name: Bruijn, M.
name: Gao, J. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We are developing X-ray microcalorimeters as a backup option for the baseline detectors in the X-IFU instrument on board the ATHENA space mission led by ESA and to be launched in the early 2030s.5$\times$5 mixed arrays with TiAu transition-edge sensor (TES), which have different high aspect ratios and thus high resistances, have been designed and fabricated to meet the energy resolution requirement of the X-IFU instrument. Such arrays can also be used to optimise the performance of the Frequency Domain Multiplexing (FDM) readout and lead to the final steps for the fabrication of a large detector array. In this work we present the experimental results from tens of the devices with an aspect ratio (length-to-width) ranging from 1-to-1 up to 6-to-1, measured in a single-pixel mode with a FDM readout system developed at SRON/VTT. We observed a nominal energy resolution of about 2.5 eV at 5.9 keV at bias frequencies ranging from 1 to 5 MHz. These detectors are proving to be the best TES microcalorimeters ever reported in Europe, being able to meet not only the requirements of the X-IFU instrument, but also those of other future challenging X-ray space missions, fundamental physics experiments, plasma characterization and material analysis.
Primordial Entropy Production and Lambda-driven Inflation from Quantum Einstein Gravity
Creators: name: Bonanno, Alfio
name: Reuter, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We review recent work on renormalization group (RG) improved cosmologies based upon a RG trajectory of Quantum Einstein Gravity (QEG) with realistic parameter values. In particular we argue that QEG effects can account for the entire entropy of the present Universe in the massless sector and give rise to a phase of inflationary expansion. This phase is a pure quantum effect and requires no classical inflaton field.
description: 12 pages, 4 figures, IGCG-07 Pune
X-Ray Spectral Variability in Initial Rise of XTE J1550-564
Creators: name: Wu, Y. X.
name: Liu, C. Z.
name: Li, T. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: X-ray variability of the microquasar XTE J1550-564 is studied with time domain techniques for the data from the RXTE/PCA observation in September 8, 1998. The 2--60 keV averaged shot is obtained from superposing shots with one millisecond time bin through aligning their peaks. The spectral behavior during the averaged shot exhibits prominent differences from that observed in Cyg X-1. The hardness ratio of (13--60 keV)/(2--13 keV) or (16--60 keV)/(13--16 keV) during a shot is lower or higher than that of steady emission respectively. The correlation coefficient between intensity and hardness ratio of (13--60 keV)/(2--13 keV) or (16--60 keV)/(13--16 keV) is negative or positive respectively. These results may indicate that physical processes in the low state of XTE J1550-564 are different from those in Cyg X-1.
description: 20 pages, 9 figures, To appear in ApJ May 2007
Fourfold Differential Photoelectron Circular Dichroism
Creators: name: Fehre, K.
name: Novikovskiy, N. M.
name: Grundmann, S.
name: Kastirke, G.
name: Eckart, S.
name: Trinter, F.
name: Rist, J.
name: Hartung, A.
name: Trabert, D.
name: Janke, C.
name: Nalin, G.
name: Pitzer, M.
name: Zeller, S.
name: Wiegandt, F.
name: Weller, M.
name: Kircher, M.
name: Hofmann, M.
name: Schmidt, L. Ph. H.
name: Knie, A.
name: Hans, A.
name: Ltaief, L. Ben
name: Ehresmann, A.
name: Berger, R.
name: Fukuzawa, H.
name: Ueda, K.
name: Schmidt-Böcking, H.
name: Williams, J. B.
name: Jahnke, T.
name: Dörner, R.
name: Schöffer, M. S.
name: Demekhin, Ph. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We report on a joint experimental and theoretical study of photoelectron circular dichroism (PECD) in methyloxirane. By detecting O 1s-photoelectrons in coincidence with fragment ions, we deduce the molecule's orientation and photoelectron emission direction in the laboratory frame. Thereby, we retrieve a fourfold differential PECD clearly beyond 50%. This strong chiral asymmetry is reproduced by ab initio electronic structure calculations. Providing such a pronounced contrast makes PECD of fixed-in-space chiral molecules an even more sensitive tool for chiral recognition in the gas phase.
description: 5 figures
Upper limits on gravitational wave emission from 78 radio pulsars
Creators: name: The LIGO Scientific Collaboration
name: Abbott, B.
name: Kramer, M.
name: Lyne, A. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present upper limits on the gravitational wave emission from 78 radio pulsars based on data from the third and fourth science runs of the LIGO and GEO600 gravitational wave detectors. The data from both runs have been combined coherently to maximise sensitivity. For the first time pulsars within binary (or multiple) systems have been included in the search by taking into account the signal modulation due to their orbits. Our upper limits are therefore the first measured for 56 of these pulsars. For the remaining 22, our results improve on previous upper limits by up to a factor of 10. For example, our tightest upper limit on the gravitational strain is 2.6e-25 for PSRJ1603-7202, and the equatorial ellipticity of PSRJ2124-3358 is less than 10^{-6}. Furthermore, our strain upper limit for the Crab pulsar is only 2.2 times greater than the fiducial spin-down limit.
description: 21 pages, published in Phys. Rev. D, corrected GEO600 sensitvity curve in Figure 1