cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
HIV high risk groups in Southeast Asia: a cross-sectional analysis of an intravenous drug user, sex worker, MSM, and fishermen cohort on ART in Myanmar
Creators: name: Ousley, Janet
name: Kyaw, Nang Thu
name: Phyu Ei Mon
name: Kyi Pyar Soe
name: Fernandez, Marcelo
Publisher: name: F1000Research
Year: 2015

description: In Myanmar, HIV prevalence in the general population is

0.5%, while in High Risk Groups (HRGs) it is 7.9 %, 8.9 %, and 18% for commercial sex workers (CSW), men who have sex with men (MSM), and people who inject drugs (PWIDs). Fishermen are mobile and migrant, engage in high risk behaviors disproportionately, are 20% of MSF’s southern cohort, and are also an HRG in this context.Population totals for HRGs in Myanmar rely on unpublished or methodologically questionable estimates. Rough calculations by MSF, however, indicate that HRGs may largely lack access to testing and HIV care and treatment. 
Mechanics of inter-monolayer coupling in fluid surfactant bilayers
Creators: name: Yeung, Anthony Kwok-Cheung
Publisher: name: University of British Columbia
Year: 2009

description: Fluid surfactant bilayers are composed of two mono-molecular sheets that are weakly held together by normal stresses. Except for viscous resistance, the monolayers are free to slide relative to one another — giving rise to “hidden” degrees of freedom within the composite structure. This thesis examines such an added level of complexity to the study of bi layer membranes. A continuum theory for monolayer-coupling is first developed, which forms the theoretical basis for the work reported here and for future analyses on stratified fluid membranes. The phenomenological coefficient of dynamic (viscous) coupling between monolayers is then measured experimentally by a novel method called nanotether extrusion. This technique, which is developed by myself for this present investigation, enables measurements of inter-monolayer viscous stresses in unsupported bilayers. Further, a useful spin-off from such a technique is the determination of bilayer bending rigidities. Finally, as an application of the present continuum model, the static and dynamic features of a bilayer vesicle’s Brownian shape undulations are predicted with the membrane con ceptualized as a stratified composite structure. Throughout this thesis, it is shown that the effects of bilayer stratification (monolayer-coupling) are very important. For example, the conformational dynamics of bilayer membranes on mesoscopic length scales (roughly between 1 to 100 nanometers) are governed by the inter-monolayer viscous forces; in such situations, dissipation due the surrounding hydrodynamics plays only a secondary role.
Dynamical phase transition in the first-passage probability of a Brownian motion
Creators: name: Besga, Benjamin
name: Faisant, Felix
name: Petrosyan, Artyom
name: Ciliberto, Sergio
name: Majumdar, Satya N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study theoretically, experimentally and numerically the probability distribution $F(t_f|x_0,L)$ of the first passage times $t_f$ needed by a freely diffusing Brownian particle to reach a target at a distance $L$ from the initial position $x_0$, taken from a normalized distribution $(1/σ)\, g(x_0/σ)$ of finite width $σ$. We show the existence of a critical value $b_c$ of the parameter $b=L/σ$, which determines the shape of $F(t_f|x_0,L)$. For $b>b_c$ the distribution $F(t_f|x_0,L)$ has a maximum and a minimum whereas for $b
Comparison of fission and quasi-fission modes
Creators: name: Simenel, C.
name: McGlynn, P.
name: Umar, A. S.
name: Godbey, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Quantum shell effects are known to affect the formation of fragments in nuclear fission. Shell effects also affect quasi-fission reactions occurring in heavy-ion collisions. Systematic time-dependent Hartree-Fock simulations of 50Ca+176Yb collisions show that the mass equilibration between the fragments in quasi-fission is stopped when they reach similar properties to those in the asymmetric fission mode of the 226Th compound nucleus. Similar shell effects are then expected to determine the final repartition of nucleons between the nascent fragments in both mechanisms. Future experimental studies that could test these observations are discussed.
description: 8 pages, 4 figures, 1 table
Integrating operational research into a clinical care site
Creators: name: Ousley, Janet
name: Kyaw, Nang Thu
name: Fernandez, Marcelo
name: Aelbrecht, Liesbeth
Publisher: name: F1000Research
Year: 2015

description: Myanmar has a dearth of published literature due to decades of isolation. Recent openings, however, mean the government is scaling up health programs. After more than ten years in the country, MSF has an enormous amount of clinical data about providing care in the context. We established an Operational Research (OR) unit in 2014 to use and learn from this data and to answer original OR questions. MSF hopes the research will have wide effects. We will begin transferring some stable patients to government facilities in 2015. Advocating for a comparable level of care once transferred by using research based evidence is one goal of the new research unit.Key areas highlighted were the importance of organizational management within a research team; challenges of research partnerships; having patience during unexpected delays and the need for Follow-Up and Care of HIV Infection and AIDS (FUCHIA) data quality checks. 
A 2-categories companion
Creators: name: Lack, Stephen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 18D05, 18C15, 18C20, 18G55, 55U35

description: This paper is a rather informal guide to some of the basic theory of 2-categories and bicategories, including notions of limit and colimit, 2-dimensional universal algebra, formal category theory, and nerves of bicategories. As is the way of these things, the choice of topics is somewhat personal. No attempt is made at either rigour or completeness. Nor is it completely introductory: you will not find a definition of bicategory; but then nor will you really need one to read it. In keeping with the philosophy of category theory, the morphisms between bicategories play more of a role than the bicategories themselves.
description: 73 pages; published in Towards Higher Categories, eds. John C. Baez and J. Peter May, Springer, 2009
Bosonic Quantum Dynamics Following Colliding Potential Wells
Creators: name: Köhler, Fabian
name: Schmelcher, Peter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We employ the multi-configuration time-dependent Hartree method for bosons (MCTDHB) in order to investigate the correlated non-equilibrium quantum dynamics of two bosons confined in two colliding and uniformly accelerated Gaussian wells. As the wells approach each other an effective, transient double-well structure is formed. This induces a transient and oscillatory over-barrier transport. We monitor both the amplitude of the intra-well dipole mode in the course of the dynamics as well as the final distribution of the particles between the two wells. For fast collisions we observe an emission process which we attribute to two distinct mechanisms. Energy transfer processes lead to an untrapped fraction of bosons and a resonant enhancement of the deconfinement for certain kinematic configurations can be observed. Despite the comparatively weak interaction strengths employed in this work, we identify strong inter-particle correlations by analyzing the corresponding Von Neumann entropy.
description: 29 pages, 10 figures
Double trouble: tuberculosis and substance abuse in nagaland, India
Creators: name: Shenoy, Rahul
name: Mrinalini Das
name: Mansoor, Homa
name: Rey Anicete
name: Loshon Wangshu
name: Sashi Meren
name: Imyangluba Ao
name: Saranchuk, Peter
name: Reid, Tony
name: Isaakidis, Petros
Publisher: name: F1000Research
Year: 2015

description: The Revised National Tuberculosis Programme (RNTCP) in India has been adopting many strategies to achieve universal coverage of tuberculosis (TB) treatment among vulnerable population groups. However, diagnosis and treatment of TB in substance-abuse population, also termed as people who use and/or inject illicit drugs (PWUIDs) remains a challenge in the fight to eliminate TB within India.

This study aims to detail experiences of a Médecins Sans Frontières (MSF) supported tuberculosis programme, attended by PWUIDs in Mon district, Nagaland, India.PWUIDs suffering from TB need special attention in the tuberculosis programmes. There is an urgent need of a tailored model of care including separate diagnostic and treatment algorithms, with focus on treatment-literacy and adherence-counselling, that takes into account the history of substance-abuse and socio-cultural norms.
Feasibility and outcomes of integrated cervical cancer management in Mozambique
Creators: name: T N Tran
name: N Staderini
name: N Molfino
name: B Rusch
name: I Ciglenecki
name: T Aloudat
Publisher: name: F1000Research
Year: 2015

description: In 2009, the Ministry of Health (MoH) initiated a rollout of cervical cancer (CC) screening in 4 provinces in Mozambique. MSF OCG engaged with and supported the MoH to provide these services in 3 health facilities with the aim of exploring:

the burden of CC in the population;

 the feasibility of a screen-and-treat strategy that is integrated into sexual and reproductive health (SRH), and maternal and newborn health services.

This poster presents the preliminary results of this screening program, which is among the first CC screening programs carried out at MSF.With MSF’s support to ongoing MoH programmes, integration of CC screening, using a screen-and-treat strategy, into regular SRH and maternal and newborn health services is feasible with outcomes comparable to those of international studies.

As visual inspection with acetic acid (VIA) is provider-dependent, competency training and ongoing supportive supervision are essential to ensure high quality of services. When indicated, same day treatment of VIA+ lesions is accepted by a majority of women. The referral system for complicated cases remains sub-optimal and calls for the strengthening of the tertiary level of CC care in the public sector.
Μοντελοποίηση διάχυσης πληροφορίας σε κοινωνικά δίκτυα. Μελέτη περίπτωσης twitter
Creators: name: Αργυρού, Ουρανία Θεοδώρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διάχυση πληροφορίας/φήμης
Επιδημιολογικά μοντέλα
Κοινωνικό δίκτυo Twitter
Information/rumor diffusion
Epidemic models
Social network Twitter

description: Η εξάπλωση των επιδημιών και η μοντελοποίησή της, έχει αποτελέσει έμπνευση για πολλούς ερευνητές, στον εντοπισμό αντιστοιχιών και γενίκευσης σε όλα τα φαινόμενα της καθημερινότητας όπου παρατηρείται διάχυση. Γενικά, φαινόμενα διάχυσης παρατηρούνται σε πληθυσμούς όπου υπάρχει δικτύωση. Μία από τις εφαρμογές των επιδημιολογικών μοντέλων προκύπτει από την αντιστοίχηση της διάχυσης πληροφορίας σε δίκτυο με την εξάπλωση μεταδοτικών νόσων. Η μαθηματική μοντελοποίηση και η προσομοίωση αποτελούν δύο βασικά εργαλεία για τη μελέτη τέτοιων φαινομένων διάχυσης. Στην παρούσα εργασία, μελετάται η διάδοση της πληροφορίας μέσα σε ένα κοινωνικό δίκτυο. Απώτερος στόχος είναι η επιτυχής πρόβλεψη της συμπεριφοράς του συστήματος. Το πρωτότυπο θεωρητικό μοντέλο που προτείνεται, στηρίχτηκε σε ένα μοντέλο από την επιδημιολογία, με κατάλληλη τροποποίηση ώστε να συνάδει με τις ιδιαιτερότητες του κοινωνικού δικτύου Twitter. Ο έλεγχος εγκυρότητας του μοντέλου και η αξιολόγηση των ευρημάτων, έγιναν μέσω της ανάπτυξης κατάλληλου λογισμικού και βάσει πραγματικών δεδομένων.
description: The spread of epidemics and its modeling has been an inspiration for many researchers, in identifying similarities and generalization to other phenomena of everyday life where diffusion occurs. Generally, diffusion phenomena occur in populations where there is an underlying network structure. An application of epidemiological models arises from the correspondence between information dissemination within a network and the spread of communicable diseases. Mathematical modeling and simulation are two basic tools for studying such diffusion phenomena. In this master thesis, the dissemination of information within a social network is being studied. The ultimate goal is to predict the behavior of the system successfully. The original theoretical model proposed was based on a model from epidemiology, appropriately modified to conform to the peculiarities of the Twitter social network. The model validation and the evaluation of the findings were made by developing appropriate software and based on real data.
Stability of Quantized Vortices in a Bose-Einstein Condensate Confined in an Optical Lattice
Creators: name: Law, K. J. H.
name: Qiao, L.
name: Kevrekidis, P. G.
name: Kevrekidis, I. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We investigate the existence and especially the linear stability of single and multiple-charge quantized vortex states of nonlinear Schroedinger equations in the presence of a periodic and a parabolic potential in two spatial dimensions. The study is motivated by the examination of pancake-shaped Bose-Einstein condensates in the presence of magnetic and optical confiement. A two-parameter space of the condensate's chemical potential versus the periodic potential's strength is scanned for both single- and double-quantized vortex states located at a local minimum or a local maximum of the lattice. Triply charged vortices are also briefly discussed. Single-charged vortices are found to be stable for cosinusoidal potentials and unstable for sinusoidal ones above a critical strength. Higher charge vortices are more unstable for both types of potentials and their dynamical evolution leads to breakup into single-charged vortices.
$τ\to \ell +$ invisible through invisible-savvy collider variables
Creators: name: Guadagnoli, Diego
name: Park, Chan Beom
name: Tenchini, Francesco
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: New particles $ϕ$ in the MeV-GeV range produced at colliders and escaping detection can be searched for at operating $b-$ and $τ-$factories such as Belle II. A typical search topology involves pair-produced $τ$s (or mesons), one of which decaying to visibles plus the $ϕ$, and the other providing a tag. One crucial impediment of these searches is the limited ability to reconstruct the parents' separate boosts. This is the case in the 'typical' topology where both decay branches include escaping particles. We observe that such topology lends itself to the use of kinematic variables such as $M_2$, designed for pairwise decays to visibles plus escaping particles, and endowed with a built-in ('MAOS') way to efficiently guess the parents' separate boosts. Starting from this observation, we construct several kinematic quantities able to discriminate signal from background, and apply them to a benchmark search, $τ\to e + ϕ$, where $ϕ$ can be either an axion-like particle or a hidden photon. Our considered variables can be applied to a wider range of topologies than the current reference technique, based on the event thrust, with which they are nearly uncorrelated. Application of our strategy leads to an improvement by a factor close to 3 in the branching-ratio upper limit for $τ\to e ϕ$, with respect to the currently expected limit, assuming $m_ϕ\lesssim 1$ MeV. For example, we anticipate a sensitivity of $1.7 \times 10^{-5}$ with the data collected before the 2022 shutdown.
description: 8 pages, 7 figures. v2: Revised text, results unchanged. Matches journal version
Non-trivial Tachyon Profiles in Low Energy Effective Theory
Creators: name: Suyama, Takao
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study classical solutions of a low energy effective theory of a string theory with tachyons. With a certain ansatz, we obtain all possible solutions which are weakly coupled and weakly curved. We find, in addition to the interpolating solutions studied in our previous paper, black hole solutions and solutions including the geometry of a capped cylinder. Some possible implications of the solutions to closed string tachyon condensation are discussed.
description: 20 pages, minor change
Economical Quantum Secure Direct Communication Network with Single Photons
Creators: name: Deng, Fu-Guo
name: Li, Xi-Han
name: Li, Chun-Yan
name: Zhou, Ping
name: Zhou, Hong-Yu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A scheme for quantum secure direct communication (QSDC) network is proposed with a sequence of polarized single photons. The single photons are prepared originally in the same state |0> by the servers on the network, which will reduce the difficulty for the legitimate users to check eavesdropping largely. The users code the information on the single photons with two unitary operations which do not change their measuring bases. Some decoy photons, which are produced by operating the sample photons with a Hadamard, are used for preventing a potentially dishonest server from eavesdropping the quantum lines freely. This scheme is an economical one as it is the easiest way for QSDC network communication securely.
description: 6 pages, 3 figures
Επίλυση διαφορικών εξισώσεων και συστημάτων διαφορικών εξισώσεων ODE, με χρήση αριθμητικών μεθόδων - εφαρμογές με προγράμματα σε C++
Creators: name: Βασιλειάδου, Άννα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διαφορική Εξίσωση
Σύστημα Διαφορικών Εξισώσεων
Αριθμητική Μέθοδος
Differential Equation
System of Differential Equations
Numerical Method

description: Η ανάγκη χρήσης αριθμητικών μεθόδων για την επίλυση διαφορικών εξισώσεων και συστημάτων διαφορικών εξισώσεων, είναι κατά κύριο λόγο απόρροια της μεγάλης ποικιλίας της εμφάνισής τους σε προβλήματα που προκύπτουν σε πραγματικά συστήματα στους χώρους κυρίως της βιολογίας, της φυσικής και της μηχανικής. Στην παρούσα εργασία μελετάμε συνήθεις διαφορικές εξισώσεις πρώτης τάξης και στη συνέχεια διαφορικές εξισώσεις δεύτερης, τρίτης και τέταρτης τάξης των οποίων η επίλυση μέσω ενός μετασχηματισμού, ανάγεται στην επίλυση συστημάτων διαφορικών εξισώσεων πρώτης τάξης. Η εργασία αυτή είναι χωρισμένη σε δύο κεφάλαια. Το πρώτο περιλαμβάνει θεμελιώδεις έννοιες σχετικά με τις διαφορικές εξισώσεις πρώτης τάξης και την αριθμητική επίλυση αυτών, ενώ παράλληλα γίνεται εφαρμογή συγκεκριμένων αριθμητικών μεθόδων με χρήση C++. Το δεύτερο κεφάλαιο πραγματεύεται την επίλυση συνήθων διαφορικών εξισώσεων ανώτερης τάξης, των οποίων η επίλύση ανάγεται σε συστήματα διαφορικών εξισώσεων πρώτης τάξης. Γίνεται παρουσίαση παραδειγμάτων για διαφορικές εξισώσεις μέχρι και τέταρτης τάξης σε C++, ενώ σκιαγραφείται η επίλυση διαφορικών εξισώσεων ODEs ακόμα μεγαλύτερων τάξεων. Τέλος ενδεικτικά παρατίθενται ορισμένοι από τους κώδικες σε C++, που χρησιμοποιήθηκαν για την επίλυση προβλημάτων που μας απασχόλησαν κατά την διάρκεια της εργασίας.
description: Should people be aware of the significance of the numerical solution of differential equations, they will never examine the reason of such a large number of numerical methods and of such an abundant literature of these kind of subjects. The extensive use of numerical methods concerning the solution of differential equations and systems of differential equations, is a result of the tremendous variety of actual systems in the physical and biological sciences and engineering disciplines that are describing by differential equations and systems of differential equations. In this work we present some numerical methods which approach step by step the solution of first order ODEs, accompanied with an initial condition. Then we extend this solution to higher order differential equations, whose solution achieved by converting the initial equation to a system of first order differential equations, of course by having a specific number of initial conditions depending on the order of the ODE we examine. In order to estimate the accuracy at each step of the using method, we estimate specific kinds of errors in each step and we also present some plots. Each and every equation and method, which we use, have their own program created in C++. Some of them are finally presented on the appendix, where the reader can examine.
Comment on "Thermal, Quantum Antibunching and Lasing Thresholds from Single Emitters to Macroscopic Devices"
Creators: name: Vyshnevyy, A. A.
name: Fedyanin, D. Yu.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a recent Letter [Phys. Rev. Lett. 126, 063902 (2021)], M. A. Carroll et al. derived a model to analytically determine regimes of thermal, collective anti-bunching, and laser emission for emitters in a cavity. According to their model, nanolasers exhibit a distinct threshold at which the coherent laser field emerges from a bifurcation at a finite pump rate. The amplitude of this coherent field increases with a further increase in the pump rate. Such a behavior contrasts the usual view of the transition to lasing in single-mode high-$β$ nanolasers, according to which strong spontaneous emission into the lasing mode results in a smooth transformation from the thermal state to the coherent state as the pump rate increases. Here, we demonstrate that the authors have ignored important terms in the equations of their model, which caused the bifurcation and the ideally monochromatic field to emerge at a finite pump rate.
description: 2 pages, 0 figures
Η επίδραση των χαρακτηριστικών της προσωπικότητας στην αποφυγή των διαφημίσεων στο διαδίκτυο
Creators: name: Αθανασιάδου, Ειρήνη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αποφυγή διαφήμισης
Χαρακτηριστικά προσωπικότητας
Διαδίκτυο
Adblocking
Big five
Internet

description: Αυτή η μελέτη σχεδιάστηκε για να παρέχει πληροφορίες σχετικά με την αποφυγή διαφημίσεων στο διαδίκτυο και κατά πόσο αυτή επηρεάζεται από τα χαρακτηριστικά της προσωπικότητας ενός ατόμου. Τα χαρακτηριστικά της προσωπικότητας συνοψίζονται στο μοντέλο των πέντε παραγόντων “Big Five” και είναι η εξωστρέφεια, η τερπνότητα, η ευσυνειδησία, ο νευρωτισμός και το άνοιγμα σε νέες εμπειρίες. Οι αρνητικές τάσεις προς τη διαφήμιση μέσω διαδικτύου, κάνουν επιτακτική την ανάγκη για μελέτη διαφόρων παραγόντων που επηρεάζουν την αποφυγή διαδικτυακών διαφημίσεων. Συνεπώς, η μελέτη αυτή αναπτύσσει ένα ολοκληρωμένο θεωρητικό μοντέλο που εξηγεί την αποφυγή διαφήμισης στο Διαδίκτυο. Εξετάσαμε πέντε μεταβλητές της αποφυγής διαφήμισης(γνωστική αποφυγή, συναισθηματική αποφυγή, συμπεριφορική αποφυγή, σκεπτικισμός απέναντι στη διαφήμιση, αντιληπτή διαφημιστική σύγχυση) σε συνάρτηση με το κάθε χαρακτηριστικό της προσωπικότητας. Διαπιστώσαμε ότι κάποια χαρακτηριστικά της προσωπικότητας επηρεάζουν είτε θετικά είτε αρνητικά την έκθεση σε διαφημίσεις διαδικτύου. Ο νευρωτισμός βρέθηκε να είναι το πιο σημαντικό χαρακτηριστικό που εξηγεί την αποφυγή διαφημίσεων στο Διαδίκτυο.
description: This study was designed to provide information on avoiding online advertising and whether it is influenced by the personality traits of a person. Personality traits are summed up in the five Big Five model and are extraversion, agreeableness, conscientiousness, neuroticism and openness to new experiences. Negative trends towards internet advertising make it imperative to study various factors that affect the avoidance of online advertising. Therefore, this study develops an integrated theoretical model explaining the avoidance of Internet advertising. We examined five ad avoidance variables (cognitive avoidance, emotional avoidance, behavioral avoidance, skepticism towards advertising, perceived advertising confusion) in relation to each personality trait. We have found that some personality traits affect positively or negatively exposure to internet ads. Neuroticism has been found to be the most important feature that explains the avoidance of advertisements on the Internet.
Depozitul de obiecte de bronz de la Putreda (r. Rîmnicu-Sărat, reg. Ploieşti)
Creators: name: Isăcescu, Elena
Publisher: name: Arheologia Moldovei
Year: 2021

description: The bronze objects deposit of of Putreda (r. Rîmnicu-Sărat, reg. Ploieşti) Includes a summary in French
description: Arheologia Moldovei, Bd. 5 (1967): Arheologia Moldovei
Pressure dependence of superconductivity in doped two-leg ladder cuprates
Creators: name: Qin, Jihong
name: Chen, Ting
name: Feng, Shiping
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Within the kinetic energy driven superconducting mechanism, the effect of the pressure on superconductivity in doped two-leg ladder cuprates is studied. It is shown that the superconducting transition temperature in doped two-leg ladder cuprate superconductors increases with increasing pressure in the underpressure regime, and reaches a maximum in the optimal pressure, then decreases in the overpressure regime. This domed shape of the pressure dependence of the superconducting transition temperature is similar to that of the pressure dependence of the longitudinal part of the superconducting gap parameter, indicating that superconductivity in doped two-leg ladder cuprates is mainly produced by the development of the pairing correlation along legs.
description: 5 pages, 3 figures, added figure 3, references, and discussions
Global optimization of atomic structures with gradient-enhanced Gaussian process regression
Creators: name: Kaappa, Sami
name: del Río, Estefanía Garijo
name: Jacobsen, Karsten Wedel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Determination of atomic structures is a key challenge in the fields of computational physics and materials science, as a large variety of mechanical, chemical, electronic, and optical properties depend sensitively on structure. Here, we present a global optimization scheme where energy and force information from density functional theory (DFT) calculations is transferred to a probabilistic surrogate model to estimate both the potential energy surface (PES) and the associated uncertainties. The local minima in the surrogate PES are then used to guide the search for the global minimum in the DFT potential. We find that adding the gradients in most cases improves the efficiency of the search significantly. The method is applied to global optimization of [Ta$_2$O$_5$]$_x$ clusters with $x=1,2,3$, and the surface structure of oxidized ZrN.
Επαυξημένη πραγματικότητα και εκπαίδευση: Διερεύνηση των συναισθηματικών αποτελεσμάτων σε μαθητές της πρωτοβάθμιας εκπαίδευσης στο πλαίσιο διδασκαλίας για το Ηλιακό Σύστημα
Creators: name: Δράτσιου, Ιωάννα Παναγιώτης
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: STEM Εκπαίδευση
Επαυξημένη Πραγματικότητα
Αστρονομία
Συναισθηματική Μάθηση
Εμπλοκή στη μάθηση
STEM Education
Augmented Reality
Astronomy
Emotional Learning
Engagement in Learning

description: Η διδασκαλία των STEM επιστημών αποτελεί ένα πολυσύνθετο ζήτημα, καθώς οι μαθητές συχνά αντιμετωπίζουν δυσκολία στην επιτυχή προσέγγιση και κατανόηση του περιεχομένου της. Η αναμόρφωση της STEM εκπαίδευσης και η ενσωμάτωση της τεχνολογίας σε αυτήν αποτελεί μια από τις σημαντικότερες κατευθύνσεις που δύναται να ακολουθήσει η σύγχρονη εκπαίδευση. Οι εκπαιδευτικές εφαρμογές της Επαυξημένης Πραγματικότητας (ΕΠ) δημιουργούν τις κατάλληλες συνθήκες για την αποτελεσματική προσέγγιση και αλληλεπίδραση των μαθητών με τις επιστήμες της STEM εκπαίδευσης και την παράλληλη ενεργοποίηση εμπειριών και δεξιοτήτων που διαφορετικά δεν θα ήταν εφικτές. Η μελέτη αυτή περιγράφει τη διεξαγωγή παρέμβασης για τη διδασκαλία της Αστρονομίας σε 39 μαθητές της ΣΤ΄ τάξης Δημοτικού με την αξιοποίηση μιας κινητής εκπαιδευτικής εφαρμογής ΕΠ. Κύριος στόχος υπήρξε η διερεύνηση και αξιολόγηση των συναισθηματικών αποτελεσμάτων στους μαθητές μέσω μιας κλίμακας αυτό-αναφοράς. Τα αποτελέσματα έδειξαν πως 1) η συναισθηματική διάθεση των μαθητών τόσο της πειραματικής ομάδας όσο και της ομάδας ελέγχου βελτιώθηκε μετά την παρέμβαση και πως 2) η συναισθηματική διάθεση των μαθητών της πειραματικής ομάδας ήταν πιο θετική σε σχέση με αυτή της ομάδας ελέγχου.
description: Teaching STEM education is a complex issue, as students often find it difficult to successfully approach and understand their content. Reforming STEM education and integrating technology into it is one of the most important directions that modern education could follow. Educational Augmented Reality applications create the right conditions for students to effectively approach and interact with STEM sciences and activate experiences and skills that otherwise would not be feasible. In this study is presented an educational intervention that was conducted aiming approaching and teaching the science of Astronomy in 39 elementary school students. Within the framework of this intervention a mobile AR educational application was used. The main objective was to explore and evaluate emotional outcomes of students through a self-referential scale. The results showed that 1) the emotional mood of both the experimental group and the control group was improved after the intervention and that 2) the emotional mood of experimental group’s students was more positive than that of the control group.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Ιωαννίνων)
Properties of dust in early-type galaxies
Creators: name: Patil, M. K.
name: Pandey, S. K.
name: Sahu, D. K.
name: Kembhavi, A. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report optical extinction properties of dust for a sample of 26 early-type galaxies based on the analysis of their multicolour CCD observations. The wavelength dependence of dust extinction for these galaxies is determined and the extinction curves are found to run parallel to the Galactic extinction curve, which implies that the properties of dust in the extragalactic environment are quite similar to those of the Milky Way. For the sample galaxies, value of the parameter $R_V$, the ratio of total extinction in $V$ band to selective extinction in $B$ & $V$ bands, lies in the range 2.03 - 3.46 with an average of 3.02, compared to its canonical value of 3.1 for the Milky Way. A dependence of $R_V$ on dust morphology of the host galaxy is also noticed in the sense that galaxies with a well defined dust lane show tendency to have smaller $R_V$ values compared to the galaxies with disturbed dust morphology. The dust content of these galaxies estimated using total optical extinction is found to lie in the range $10^4$ to $10^6 \rm M_{\sun}$, an order of magnitude smaller than those derived from IRAS flux densities, indicating that a significant fraction of dust intermixed with stars remains undetected by the optical method. We examine the relationship between dust mass derived from IRAS flux and the X-ray luminosity of the host galaxies.The issue of the origin of dust in early-type galaxies is also discussed.
description: 12 pages, 6 figures. Accepted for publication in Astronomy & Astrophysics
Cross-dimensional universality classes in static and periodically driven Kitaev models
Creators: name: Molignini, Paolo
name: Celades, Albert Gasull
name: Chitra, R.
name: Chen, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The Kitaev model on the honeycomb lattice is a paradigmatic system known to host a wealth of nontrivial topological phases and Majorana edge modes. In the static case, the Majorana edge modes are nondispersive. When the system is periodically driven in time, such edge modes can disperse and become chiral. We obtain the full phase diagram of the driven model as a function of the coupling and the driving period. We characterize the quantum criticality of the different topological phase transitions in both the static and driven model via the notions of Majorana-Wannier state correlation functions and momentum-dependent fidelity susceptibilities. We show that the system hosts cross-dimensional universality classes: although the static Kitaev model is defined on a 2D honeycomb lattice, its criticality falls into the universality class of 1D linear Dirac models. For the periodically driven Kitaev model, besides the universality class of prototype 2D linear Dirac models, an additional 1D nodal loop type of criticality exists owing to emergent time-reversal and mirror symmetries, indicating the possibility of engineering multiple universality classes by periodic driving. The manipulation of time-reversal symmetry allows the periodic driving to control the chirality of the Majorana edge states.
description: 14 pages, 11 figures
Ceramica otomană de Iznik din secolele XVI-XVII găsită în Moldova
Creators: name: Nicolescu, Corina
Publisher: name: Arheologia Moldovei
Year: 2021

description: The 16 – 17th centuries Iznik Ottoman pottery found in Moldavia Includes a summary in French
description: Arheologia Moldovei, Bd. 5 (1967): Arheologia Moldovei
Additional file 2 of Ginsenoside Rh2 represses autophagy to promote cervical cancer cell apoptosis during starvation
Creators: name: Wang, Jiawen
name: Bian, Shuai
name: Wang, Siming
name: Yang, Song
name: Zhang, Wanying
name: Zhao, Daqing
name: Liu, Meichen
name: Bai, Xueyuan
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Chemical Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Hematology

description: Additional file 2: Table S1. Statistical analysis of apoptosis, as determined by the flow cytometric evaluation to Figs. 2b, 3a, 3b, 6b and S2A.
Săpăturile arheologice de la Curtea domnească din Iaşi
Creators: name: Andronic, Al.
name: Neamţu, Eugenia
name: Dinu, M.
Publisher: name: Arheologia Moldovei
Year: 2021

description: The archaeological excavations at the Princely Court in Iași Includes a summary in French
description: Arheologia Moldovei, Bd. 5 (1967): Arheologia Moldovei
Polarisation control of quasi-monochromatic XUV produced via resonant high harmonic generation
Creators: name: Khokhlova, M. A.
name: Emelin, M. Yu.
name: Ryabikin, M. Yu.
name: Strelkov, V. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a numerical study of the resonant high harmonic generation by tin ions in an elliptically-polarised laser field along with a simple analytical model revealing the mechanism and main features of this process. We show that the yield of the resonant harmonics behaves anomalously with the fundamental field ellipticity, namely the drop of the resonant harmonic intensity with the fundamental ellipticity is much slower than for high harmonics generated through the nonresonant mechanism. Moreover, we study the polarisation properties of high harmonics generated in elliptically-polarised field and show that the ellipticity of harmonics near the resonance is significantly higher than for ones far off the resonance. This introduces a prospective way to create a source of the quasi-monochromatic coherent XUV with controllable ellipticity potentially up to circular.
Retrieval of branching sequences in associative memory model with common external input and bias input
Creators: name: Katahira, Kentaro
name: Kawamura, Masaki
name: Okanoya, Kazuo
name: Okada, Masato
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We investigate a recurrent neural network model with common external and bias inputs that can retrieve branching sequences. Retrieval of memory sequences is one of the most important functions of the brain. A lot of research has been done on neural networks that process memory sequences. Most of it has focused on fixed memory sequences. However, many animals can remember and recall branching sequences. Therefore, we propose an associative memory model that can retrieve branching sequences. Our model has bias input and common external input. Kawamura and Okada reported that common external input enables sequential memory retrieval in an associative memory model with auto- and weak cross-correlation connections. We show that retrieval processes along branching sequences are controllable with both the bias input and the common external input. To analyze the behaviors of our model, we derived the macroscopic dynamical description as a probability density function. The results obtained by our theory agree with those obtained by computer simulations.
Un tezaur de monede moldoveneşti din prima jumătate a secolului al XV-lea, descoperit Ia Suceava
Creators: name: Iliescu, O.
name: Foit, Gr.
Publisher: name: Arheologia Moldovei
Year: 2021

description: A hoard of Moldavian coins from the first half of the 15th century, found in Suceava Includes a summary in French
description: Arheologia Moldovei, Bd. 5 (1967): Arheologia Moldovei
Εξαγωγή συχνότητας ηλεκτρικού δικτύου
Creators: name: Μπατσιούλας, Μανασσής Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πληροφορική
Επικοινωνίες
Θεσσαλονίκη
Information
Technology
Thessaloniki

description: Το θέμα της παρούσας εργασίας είναι η συχνότητα ηλεκτρικού δικτύου, όπως αυτή εξάγεται από μία ψηφιακή ηχογράφηση. Η συχνότητα του ηλεκτρικού δικτύου είναι ένα σημαντικό εγκληματολογικό εργαλείο αξιολόγησης της αυθεντικότητας και ακεραιότητας των ψηφιακών ηχογραφήσεων. Η ανάλυση της συχνότητας ηλεκτρικού δικτύου μπορεί να καταστεί δυνατή, όταν η συσκευή εγγραφής τροφοδοτείται με ηλεκτρικό ρεύμα ή όταν η συσκευή που τροφοδοτείται με μπαταρία, βρίσκεται πλησίον άλλων συσκευών συνδεδεμένων στο ηλεκτρικό δίκτυο, είτε κοντά σε γραμμές ηλεκτρικής τροφοδοσίας. Στην εργασία μελετώνται αλγόριθμοι εξαγωγής της συχνότητας του ηλεκτρικού δικτύου από μία ηχητική καταγραφή και η σύγκριση της εξαχθείσας συχνότητας ηλεκτρικού δικτύου με την αληθή τιμή της όπως καταγράφηκε σε βάση δεδομένων προκειμένου να επαληθευτεί ο τόπος και ο χρόνος της καταγραφής. Οι αλγόριθμοι που μελετώνται, είναι ο βραχυχρόνιος μετασχηματισμός Fourier , η μη παραμετρική τεχνική Blackman-Tuckey και η επαναληπτική προσαρμοστική προσέγγιση IAA. Τα αποτελέσματά τους συγκρίνονται για τις τρεις πρώτες αρμονικές. Αξίζει να αναφερθεί η χρήση τετραγωνικής παρεμβολής για τη βελτιστοποίηση των αποτελεσμάτων. Ως κριτήριο σύγκρισης χρησιμοποιείται ο συντελεστής αυτοσυσχέτισης για την ταύτιση της εξαχθείσας χρονοσειράς συχνοτήτων ηλεκτρικού δικτύου και της αληθής χρονοσειράς από τη βάση δεδομένων. Παρατίθενται διαγράμματα για την καλύτερη οπτική κατανόηση καθώς και την ποσοστιαία ανάλυση του συντελεστή αυτοσυσχέτισης στις μεθόδους.
description: The topic of this thesis is the electrical network frequency extraction from digital recordings. The The topic of this thesis is the electric network frequency and how it is exported by a digital recording. The frequency of the electric network is an important forensic tool for the evaluation of the authenticity and the integrity of digital recordings. The analysis of the electric network frequency is possible when the recording device is supplied with electricity or when the device, which is supplied by a battery, is either near other devices that are connected to the electric network or near lines of electrical power supply. This thesis studies algorithms of the exported electric network frequency from an audio recording and the comparison of the exported frequency with the real value as it was recorded on a database, in order to verify the time and place of the recording. The algorithms examined are the Short-Time Fourier Transform, the non-parametric technic of Blackman-Tuckey and the Iterative Adaptive Approach (IAA). Their results are compared for the first three harmonics. The use of quadratic interpolation for the results' improvement is notable. The correlation coefficient is used as a criterion for comparison for the identification of the exported timeline from the database. Diagrams are provided for better visual understanding and to support the quantitative analysis of the correlation coefficient.
Descoperiri epigrafice şi arheologice pe graniţa de est a Daciei romane
Creators: name: Székely, Zoltân
Publisher: name: Arheologia Moldovei
Year: 2021

description: Epigraphic and archaeological finds on the eastern border of Roman Dacia Includes a summary in French
description: Arheologia Moldovei, Bd. 5 (1967): Arheologia Moldovei
On semi-infinite cohomology of finite dimensional graded algebras
Creators: name: Bezrukavnikov, Roman
name: Positselski, Leonid
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Algebra (math.QA)
subject: Category Theory (math.CT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We describe a general setting for the definition of semi-infinite cohomology of finite dimensional algebras, and provide its categorical interpretation. We apply this interpretation to compute semi-infinite cohomology of some modules over the small group at a root of unity, generalizing an earlier result of S. Arkhipov (conjectured by B. Feigin).
description: 17 pages; this paper supersedes preprint arXiv:math/0005148 by the first author
An evaluation of leeches as in situ biomonitors of chlorinated phenolic compounds discharged from bleached kraft pulp mills
Creators: name: Prahacs, Steven Michael
Publisher: name: University of British Columbia
Year: 2009

description: Leeches were evaluated as biomonitors of chlorinated phenolic compounds discharged from bleached kraft pulp mills using integrated laboratory and field investigations. Semi-static laboratory bioassays of one week duration were carried out in order to determine how environmental factors such as contaminant concentration, water pH, water temperature and suspended sediments as well as biotic factors such as leech weight and species affect bioconcentration. In order to evaluate leeches under varying in situ conditions, three field monitoring trials during summer (July), fall (October) and winter (February) were conducted on the Fraser River, downstream of three bleached kraft pulp mills at Prince George B.C. There was a strong linear correlation (r² = 0.89 - 0.96) between water contaminant concentration (0.1 - 10 µg/L) and bioconcentration of chlorinated guaiacols, with slow depuration rates (t₁₋₂ > 28 days). Bioconcentration of chlorinated guaiacols was inversely related to pH (5.1 - 9.0), but was only weakly correlated with the concentration of the undissociated compound, indicating that the ionized compound also contributed to the bioavailable fraction. Bioconcentration increased between 4.4 and 11.8° C, but did not show a significant change from 11.8 to 20.0° C, indicating a bi-phasic model for the temperature - bioconcentration relationship. No clear relationship between suspended sediment concentration (0 0.15 g/L) and bioconcentration was observed, although the presence of 5% organic material in suspended sediments reduced bioavailability of the chlorinated phenolics. Water stirring in the suspended sediment bioassays increased bioconcentration relative to quiescent semi-static conditions. There was strong inverse relationship (r² = 0.90 - 0.94) between leech weight and bioconcentration with no clear trend between two different species of leech (Nephelopsis obscura and Percymoorensis marmorata). Field monitoring revealed chlorinated phenolics in pulp mill effluent (0.6 -17 μg/L) and water (0.002 - 0.073 μg/L) and suspended sediments (0.36 - 176 μg/kg) during the study periods. Leeches were effective biomonitors of tri- and tetrachlorinated guaiacols under diverse seasonal conditions, with bioconcentration factors ranging from 465 - 6000 and were accurate indicators of the relative proportions of these chlorinated contaminants in both pulp mill effluent and the Fraser River, 40 km downstream of pulp mill outfalls.
Multi-band observations of Swift J0840.7-3516: a new transient ultra-compact X-ray binary candidate
Creators: name: Zelati, F. Coti
name: Postigo, A. de Ugarte
name: Russell, T. D.
name: Borghese, A.
name: Rea, N.
name: Esposito, P.
name: Israel, G. L.
name: Campana, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on multi-band observations of the transient source Swift J0840.7-3516, which was detected in outburst in 2020 February by the Neil Gehrels Swift Observatory. The outburst episode lasted just ~5 days, during which the X-ray luminosity quickly decreased from ~3E37 erg/s at peak down to ~5E33 erg/s in quiescence (0.3-10 keV; at 10 kpc). Such a marked and rapid decrease in the flux was also registered at UV and optical wavelengths. In outburst, the source showed considerable aperiodic variability in the X-rays on timescales as short as a few seconds. The spectrum of the source in the energy range 0.3-20 keV was well described by a thermal, blackbody-like, component plus a non-thermal, power law-like, component and it softened considerably as the source returned to quiescence. The spectrum of the optical counterpart in quiescence showed broad emission features associated mainly with ionised carbon and oxygen, superposed on a blue continuum. No evidence for bright continuum radio emission was found in quiescence. We discuss possible scenarios for the nature of this source, and show that the observed phenomenology points to a transient ultra-compact X-ray binary system.
description: 13 pages, 7 figures, accepted for publication on A&A
Cercetări asupra ţesăturii găsite în vasul cu tezaurul de monede de la Oboroceni (r. Pașcani, reg. Iaşi)
Creators: name: Vlad, I.
Publisher: name: Arheologia Moldovei
Year: 2021

description: Investigations on the textile found in the vessel containing the coin hoard of Oboroceni (r. Pașcani, reg. Iaşi) Includes a summary in French
description: Arheologia Moldovei, Bd. 5 (1967): Arheologia Moldovei
Bases of Solutions for Linear Congruences
Creators: name: Smarandache, Florentin
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 11D79, 11A07

description: In this article we establish some properties regarding the solutions of a linear congruence, bases of solutions of a linear congruence, and the finding of other solutions starting from these bases.
description: 5 pages