cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Investigation of the elliptic flow fluctuations of the identified particles using the A Multi-Phase Transport model
Creators: name: Magdy, Niseem
name: Sun, Xu
name: Ye, Zhenyu
name: Evdokimov, Olga
name: Lacey, Roy A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A Multi-Phase Transport (AMPT) model is used to study the elliptic flow fluctuations of identified particles using participant and spectator event planes. The elliptic flow measured using the first order spectator event plane is expected to give the elliptic flow relative to the true reaction plane which suppresses the flow fluctuations. However, the elliptic flow measured using the second-order participant plane is expected to capture the elliptic flow fluctuations. Our study shows that the first order spectator event plane could be used to study the elliptic flow fluctuations of the identified particles in the AMPT model. The elliptic flow fluctuations magnitude shows weak particle species dependence and transverse momentum dependence. Such observation will have important implications for understanding the source of the elliptic flow fluctuations.
description: 7 pages, 4 figures
Superfluid-Mott-Insulator Transition in a One-Dimensional Optical Lattice with Double-Well Potentials
Creators: name: Jiang, H. C.
name: Weng, Z. Y.
name: Xiang, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the superfluid-Mott-insulator transition of ultracold bosonic atoms in a one-dimensional optical lattice with a double-well confining trap using the density-matrix renormalization group. At low density, the system behaves similarly as two separated ones inside harmonic traps. At high density, however, interesting features appear as the consequence of the quantum tunneling between the two wells and the competition between the "superfluid" and Mott regions. They are characterized by a rich step-plateau structure in the visibility and the satellite peaks in the momentum distribution function as a function of the on-site repulsion. These novel properties shed light on the understanding of the phase coherence between two coupled condensates and the off-diagonal correlations between the two wells.
description: 5 pages, 7 figures
Stress, maternal distress, and child adjustment following immigration : exploring the buffering role of social support
Creators: name: Short, Kathryn Helen
Publisher: name: University of British Columbia
Year: 2009

description: Immigration is typically deemed a stressful life event. For adults, the experience of uprooting and settling in a new country has been associated with elevated rates of psychological distress. Basic North American parenting models would predict that immigrant children are also at risk for developing adjustment problems; both as a direct function of immigration stress, and indirectly through the influence of parent distress and disrupted parenting behavior. Although some empirical studies support this contention, many researchers have described lower or equivalent rates of problems in immigrant, relative to nonimmigrant, children. In the present study, in an attempt to understand why it is that some children develop problems following migration whereas others remain resilient, a model that highlights the role of potential protective variables was empirically tested. New immigrant mothers from Hong Kong completed a series of questionnaires regarding extrafamilial stress, personal distress, social support, and child behavior. Another adult familiar with the child’s adjustment also completed a child behavior questionnaire. Consistent with the Basic Model, results of Moderated Multiple Regression analyses revealed that extrafamilial stress and maternal distress were significant predictors of child behavior problems. However, no support was found for the Moderator Model. When the sample was split along gender lines and the analysis was conducted for boys only, findings were consistent with the Moderator Model in that the relationship between extrafamilial stress and child behavior problems was weaker in the presence of higher levels of social support. At the same time, however, it was determined that the relationship between maternal distress and boys’ behavior was stronger at higher levels of support. There were no significant interaction effects when the analysis was conducted exclusively with families of girls. Support for the Moderator Model was more straightforward at the level of adult fi.rnctioning. In keeping with findings in the North American literature, the relationship between stress and maternal distress was moderated by social support in this immigrant sample. Cultural explanations for these findings were discussed. An integrative model that follows from the results of this study was presented as a heuristic to guide future study in this area.
Measurement of breast-tissue x-ray attenuation by spectral imaging: fresh and fixed normal and malignant tissue
Creators: name: Fredenberg, Erik
name: Willsher, Paula
name: Moa, Elin
name: Dance, David R.
name: Young, Kenneth C.
name: Wallis, Matthew G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Knowledge of x-ray attenuation is essential for developing and evaluating x-ray imaging technologies. In mammography, measurement of breast density, dose estimation, and differentiation between cysts and solid tumours are example applications requiring accurate data on tissue attenuation. Published attenuation data are, however, sparse and cover a relatively wide range. To supplement available data we have previously measured the attenuation of cyst fluid and solid lesions using photon-counting spectral mammography. The present study aims to measure the attenuation of normal adipose and glandular tissue, and to measure the effect of formalin fixation, a major uncertainty in published data. A total of 27 tumour specimens, seven fibro-glandular tissue specimens, and 15 adipose tissue specimens were included. Spectral (energy-resolved) images of the samples were acquired and the image signal was mapped to equivalent thicknesses of two known reference materials, from which x-ray attenuation as a function of energy can be derived. The spread in attenuation between samples was relatively large, partly because of natural variation. The variation of malignant and glandular tissue was similar, whereas that of adipose tissue was lower. Formalin fixation slightly altered the attenuation of malignant and glandular tissue, whereas the attenuation of adipose tissue was not significantly affected. The difference in attenuation between fresh tumour tissue and cyst fluid was smaller than has previously been measured for fixed tissue, but the difference was still significant and discrimination of these two tissue types is still possible. The difference between glandular and malignant tissue was close-to significant; it is reasonable to expect a significant difference with a larger set of samples. [cropped]
The Entanglement in Anisotropic Heisenberg XYZ Chain with inhomogeneous magnetic field
Creators: name: Yang, G. H.
name: Gao, W. B.
name: Zhou, L.
name: Song, H. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The thermal entanglement of a two-qubit anisotropic Heisenberg $XYZ$ chain under an inhomogeneous magnetic field b is studied. It is shown that when inhomogeneity is increased to certain value, the entanglement can exhibit a larger revival than that of less values of b. The property is both true for zero temperature and a finite temperature. The results also show that the entanglement and critical temperature can be increased by increasing inhomogeneous exteral magnetic field.
Black holes with a fluid of strings
Creators: name: Toledo, J. M.
name: Bezerra, V. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We obtain an exact solution of Einstein's equations for a charged, static and spherically symmetric body, surrounded by a fluid of strings and with a cosmological constant. This corresponds to the Reissner-Nordström (de Sitter)-Anti de Sitter black hole surrounded by a fluid of strings. Some aspects concerning the horizons and geodesic motion are discussed. We also obtain the metric corresponding to the Kerr-Newman black hole surrounded by a fluid of strings, by using a method to construct the rotating solution from its counterpart static one. The horizons, ergoregions, and geodesic motion are analyzed. In both cases, the role played by the fluid of strings was pointed out.
Το τμήμα της διοικητικής λογιστικής ως περιουσιακό στοιχείο της επιχείρησης:
Creators: name: Σιδηρόπουλος, Ρωμανός Παντελή
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Τμήμα Διοικητικής Λογιστικής
Σύστημα Διαχείρισης (Σχεδιασμού) Επιχειρησιακών Πόρων
Προστιθέμενη αξία της επιχείρησης
Management accounting department
Enterprise resource planning system
Added value of the company

description: Στην παρούσα εργασία εξετάζεται η συνεισφορά του τμήματος διοικητικής λογιστικής στη δημιουργία προστιθέμενης αξίας για μια επιχείρηση. Ο προσδιορισμός της αξίας από την ύπαρξη του τμήματος της διοικητικής λογιστικής στην επιχείρηση συνδέεται με τη χρήση των ERP συστημάτων . Στην εργασία δίνεται έμφαση στα άυλα οφέλη των ERP συστημάτων και ελέγχεται σε ποιο βαθμό κάθε πλεονέκτημα των ολοκληρωμένων πληροφοριακών συστημάτων συμμετέχει στη δημιουργία της συνολικής αξίας που προστίθεται στην επιχείρηση . Τα πρωτογενή δεδομένα των επιχειρήσεων που έχουν υιοθετήσει ERP συστήματα συγκεντρώθηκαν με τη βοήθεια ενός ερωτηματολογίου. Η στατιστική ανάλυση πραγματοποιήθηκε με τη χρήση στατιστικού πακέτου SPSS, με σκοπό να προσδιοριστεί η σχέσης μεταξύ της προστιθέμενης αξίας της επιχείρησης και των οφελών που προέρχονται από τα ERP συστήματα. Στα δεδομένα, που συλλέχθηκαν, εφαρμόζεται περιγραφική στατιστική, στατιστικός έλεγχος ανεξαρτησίας Χ2 και για τις ποιοτικές μεταβλητές υπολογίζεται ο συντελεστής συσχέτισης Spearman. Τέλος, προσδιορίζεται μοντέλο πολλαπλής γραμμικής παλινδρόμησης, το οποίο περιγράφει την προστιθέμενη αξία της επιχείρησης σε συνάρτηση με τα άυλα οφέλη των ERP συστημάτων .
description: This paper examines the contribution of the management accounting department in creating added value for the company. The value of the management accounting department of a firm is measured in correlation to the use of ERP systems. Emphasis is placed on the intangible benefits of ERP systems. In fact, the research examines to what extent each feature of integrated information systems contributes to the creation of overall value that can be added to the company. The primary data of companies which have adopted ERP systems were obtained through a questionnaire. Statistical analysis was, then, carried out, using the SPSS statistical package, to determine the relationship between the added value of the company and the benefits derived from ERP systems. Descriptive statistics and the statistical test of independence X2 were applied on the collected data, and for qualitative variables the Spearman correlation coefficient was calculated. Finally, the multiple linear regression model, which describes the added value of the company in relation to the intangible benefits of ERP systems, was put together.
Identifying allele specific expression in Parkinson's disease brain tissue
Creators: name: DiMucci, Demetrius
name: Ivison, Rachael
name: Jenkins, David
name: Dumitriu, Alexandra
name: Labadorf, Adam
name: Wake, Christian
name: Benson, Gary
name: Myers, Richard H
Publisher: name: F1000Research
Year: 2015

description: Allele specific expression (ASE) occurs when mRNA transcripts from two alleles are expressed at different levels. This disequilibrium is due to differential regulation across the two alleles. Variation in expression due to regulatory elements has been shown to be abundant for both cis- and trans-regulatory elements. Parkinson’s disease (PD) is a neurodegenerative disease that manifests late in life and affects between seven and ten million people worldwide. In this study, we sought to identify genes undergoing ASE in prefrontal cortex tissue of PD patients, but not in control patients. Our approach combined SNP microarray and RNA-Seq data from 33 control samples and 11 PD patients to identify genes containing at least one heterozygous SNP in any sample. We aligned RNA-Seq reads with GSNAP, a SNP-tolerant aligner, to prevent reference allele mapping bias. The software MBASED was used on the aligned reads of heterozygous SNPs to identify genes that showed evidence of ASE. To facilitate exploration of complex expression patterns and identification of SNPs experiencing ASE in these data, we created VisualASE, a tool to search, browse, and visualize heatmaps of allele expression ratios. We found 6,292 genes that undergo significant ASE in at least one individual and 23 genes that undergo significant ASE and are significantly overrepresented or in patient populations with PD (p < .05)
Moderate Resolution Spitzer Infrared Spectrograph (IRS) Observations of M, L, and T Dwarfs
Creators: name: Mainzer, A. K.
name: Roellig, Thomas L.
name: Saumon, D.
name: Marley, Mark S.
name: Cushing, Michael C.
name: Sloan, G. C.
name: Kirkpatrick, J. Davy
name: Leggett, S. K.
name: Wilson, John C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present 10 - 19 um moderate resolution spectra of ten M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. The IRS allows us to examine molecular spectroscopic features/lines at moderate spectral resolution in a heretofore untapped wavelength regime. These R~600 spectra allow for a more detailed examination of clouds, non-equilibrium chemistry, as well as the molecular features of H2O, NH3, and other trace molecular species that are the hallmarks of these objects. A cloud-free model best fits our mid-infrared spectrum of the T1 dwarf epsilon Indi Ba, and we find that the NH3 feature in epsilon Indi Bb is best explained by a non-equilibrium abundance due to vertical transport in its atmosphere. We examined a set of objects (mostly M dwarfs) in multiple systems to look for evidence of emission features, which might indicate an atmospheric temperature inversion, as well as trace molecular species; however, we found no evidence of either.
description: 19 pages, 7 figures, accepted ApJ 1/12/07
The ecology of movements made by Columbian black-tailed deer
Creators: name: McNay, R. Scott
Publisher: name: University of British Columbia
Year: 2009

description: I used movements of 74 radio-collared black-tailed deer to investigate whether an hierarchically-structured decision process constrains habitat choices. Constraints on habitat can lead to rejection of the ideal-free distribution hypothesis for black-tailed deer where their habitats are prone to large and rapid disturbances. I recorded 11,150 deer locations at 2 time scales (2-hourly and weekly) at 4 study areas on Vancouver Island, British Columbia from 1982-1991. I assessed the temporal and spatial independence of these observations before examining the distance, frequency, timing, and direction of movements. Deer that migrated every year (n = 12) occupied natal ranges at high elevations and used alternate ranges for >6 mo/yr. Migration route directions varied and were used in the absence of snow. Alternate ranges were established at mid-slope elevations on southern aspects and always enclosed some old forest, the only forest type preferred more in winter than summer. Areas of intense use on alternate ranges included old forests. Deer that migrated less consistently (n = 16) occupied natal ranges at midto low-slope positions and used alternate ranges for <4 mo/yr. All but 2 of these deer migrated in response to snow accumulation or ablation and along routes consistent with valley direction. They established alternate ranges at similar topographic positions as other migratory deer but did not necessarily have access to old forests. Non-migratory deer (n = 44) occupied natal ranges at mid- to low-elevations and used whatever forests were available. Areas of intense use tended not to include old forest. I was unable to trap migratory deer in young forests and the survival rate I estimated for resident deer indicated a declining population. Decisions concerning home- and seasonal-range establishment constrained more spatially specific decisions about habitat use. Further, these decisions were themselves likely to be limited by rigid tactics such as philopatry and site fidelity. These conclusions were tested by logging old forest winter habitat in 2 separate study areas. Fidelity, rather than habitat choice, dominated the initial responses. Deer accepted remaining habitats rather than finding old forest winter habitat elsewhere. Lack of freedom in choosing habitats has implications for habitat management, for deer response to habitat change, and for factors that affect population dynamics.
On $k$-Core Percolation in Four Dimensions
Creators: name: Parisi, Giorgio
name: Rizzo, Tommaso
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The $k$-core percolation on the Bethe lattice has been proposed as a simple model of the jamming transition because of its hybrid first-order/second-order nature. We investigate numerically $k$-core percolation on the four-dimensional regular lattice. For $k=4$ the presence of a discontinuous transition is clearly established but its nature is strictly first order. In particular, the $k$-core density displays no singular behavior before the jump and its correlation length remains finite. For $k=3$ the transition is continuous.
Δειγματοληψία στον Παγκόσμιο Ιστό και σε βάσεις δεδομένων- Ηλεκτρονικό έγκλημα- Έρευνα για την ηλεκτρονική ασφάλεια:
Creators: name: Τιφτίκογλου, Ιορδάνης Χαραλάμπους
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Δειγματοληψία
Βάση δεδομένων
Ηλεκτρονική ασφάλεια
Digmatolipsia
Electronic crimee
Electronic security

description: Το θέμα της παρούσας διπλωματικής εργασίας αφορά την Δειγματοληψία στον Παγκόσμιο Ιστό και σε βάσεις δεδομένων –Ηλεκτρονικό Έγκλημα- Έρευνα για την Ηλεκτρονική Ασφάλεια.Στην εργασία αυτή επιχειρούμε μια πολυδιάστατη προσέγγιση. Επιχειρούμε να περιγράψουμε ένα πλαίσιο το οποίο περιλαμβάνει μεθόδους στατιστικής που σχετίζονται με θέματα πληροφορικής και συγκεκριμένα με βάσεις δεδομένων σε συνδυασμό με το ευρύ θέμα του ηλεκτρονικού εγκλήματος. Το πρώτο σκέλος παρουσιάζεται μέσα από την περιγραφή συγκεκριμένων μεθόδων δειγματοληψίας που εφαρμόζονται σε βάσεις δεδομένων. Το δε δεύτερο, εξετάζεται αρχικά ως το γενικότερο θέμα ηλεκτρονικού εγκλήματος και της ηλεκτρονικής ασφάλειας. Στη συνέχεια, ορίζονται όλες τις έννοιες που χρησιμοποιούμε και περιγράφονται αναλυτικά τα σημαντικότερα είδη ηλεκτρονικού εγκλήματος, καθώς και κάποια μέτρα αντιμετώπισής τους - και συγκεκριμένα η χρήση της συμμετρικής και της ασύμμετρης κρυπτογραφίας με σκοπό τη θωράκιση κάποιων ευπαθών τομέων της ηλεκτρονικής ασφάλειας. Η εργασία ολοκληρώνεται με μια έρευνα μέσω ερωτηματολογίου που σκοπό έχει να καταδείξει και να αποσαφηνίσει τις πεποιθήσεις και την ενημέρωση του κόσμου σχετικά με θέματα ηλεκτρονικού εγκλήματος και ασφάλειας. Τα συμπεράσματα της ανάλυσης του ερωτηματολογίου παρατίθενται λεπτομερώς.
description: In this work we attempt a multidimensional approach. We attempt to describe a frame which includes methods of statistics that are related with subjects of information technology and specifically with data bases in combination with the wide subject of electronic crime. The first part is presented through the description of specific methods of sampling that apply to databases. The second part is examined initially as the more general subject of electronic crime and electronic security. Afterwards, all the notions used are described and analytically the most important types of electronic crime are described, as well as certain measures of confrontation - and specifically, the use of symmetric and asymmetric cryptography, aiming at the armouring of sensitive aspects of electronic security. The work is completed with a research via questionnaire which’s aim is to show and to clarify people’s beliefs and awareness regarding electronic crime and security. The conclusions of the questionnaire analysis are presented in detail.
Curvature corrections to the low energy effective theory in 6D regularized braneworlds
Creators: name: Kobayashi, Tsutomu
name: Shiromizu, Tetsuya
name: de Rham, Claudia
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the effective gravitational theory on a brane in a six-dimensional Einstein-Maxwell model of flux compactification, regularizing a conical defect as a codimension-one brane. We employ the gradient expansion technique valid at low energies. A lowest order analysis showed that standard four-dimensional Einstein gravity is reproduced on the brane. We extend this study to include second order corrections in the effective equations, and show that the correction term is given by a quadratic energy-momentum tensor. Taking the thin-brane limit where the regularized brane shrinks to the pole, we find that the second order metric diverges logarithmically on the brane, giving rise to divergences in the brane effective action. Away from the branes, the effective action is however well-defined.
description: 14 pages
Determination of the superoutburst cycle lengths of 206 SU UMa type dwarf novae
Creators: name: Vogt, N.
name: Puebla, E. C.
name: Contreras-Quijada, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: SU UMa stars are characterized by "superoutbursts" which are brighter at maximum light and which last much longer than the more frequent "ordinary" outbursts of these dwarf novae. Although there are now more than 1180 SU UMa type dwarf novae catalogued, our knowledge on their superoutburst cycle length Cso was hitherto limited to about 6$\%$ of the entire sample of known SU UMa stars. Using public data bases we have determined new Cso values for a total of 206 additional SU UMa stars in the range 17 d $$ 450 d was unexplored until now; we add here 106 cases ($\sim$51$\%$ of our total sample) in this range of long cycles, implying a better statistical basis for future studies of their distribution. Our sample contains 16 known WZ Sge stars, and we propose WZ Sge membership for 5 others hitherto classified as ordinary SU UMa stars. Individual superoutburst timings deviate in average about $\pm$7$\%$ of the cycle length from their overall linear ephemeris, conrming a pronounced quasi-periodic repeatability of superoutbursts. All relevant parameters are listed with their errors, and a table with individual superoutburst epochs of our targets is given, enabling future researchers to combine our results with other (past or future) observations.
HAZRATI ALISHER NAVOIYNING MUSIQIY TAFAKKURI
Creators: name: Muhammadjonova, Mohinur
Publisher: name: Zenodo
Year: 2024

description: Mazkur maqolada oʻzbek adabiyoti asoschisi Alisher Navoiyning musiqaga qanchalik aloqadorligi atroflicha koʻrib chiqiladi.
Renormalizability of the dimension two gluon operator $A^{2}$ in a class of nonlinear covariant gauges
Creators: name: Lemes, V. E. R.
name: Sobreiro, R. F.
name: Sorella, S. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work we discuss a class of nonlinear covariant gauges for Yang-Mills theories which enjoy the property of being multiplicatively renormalizable to all orders. This property follows from the validity of a linearly broken identity, known as the ghost Ward identity. Furthermore, thanks to this identity, it turns out that the local composite dimension two gluon operator $A_μ^{a}A_μ^{a}$ can be introduced in a mulptiplicatively renormalizable way.
Volumetric breast-density measurement using spectral photon-counting tomosynthesis: First clinical results
Creators: name: Fredenberg, Erik
name: Berggren, Karl
name: Bartels, Matthias
name: Erhard, Klaus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Image and Video Processing (eess.IV)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Biological sciences

description: Measurements of breast density have the potential to improve the efficiency and reduce the cost of screening mammography through personalized screening. Breast density has traditionally been evaluated from the dense area in a mammogram, but volumetric assessment methods, which measure the volumetric fraction of fibro-glandular tissue in the breast, are potentially more consistent and physically sound. The purpose of the present study is to evaluate a method for measuring the volumetric breast density using photon-counting spectral tomosynthesis. The performance of the method was evaluated using phantom measurements and clinical data from a small population (n=18). The precision was determined to 2.4 percentage points (pp) of volumetric breast density. Strong correlations were observed between contralateral (R^2=0.95) and ipsilateral (R^2=0.96) breast-density measurements. The measured breast density was anti-correlated to breast thickness, as expected, and exhibited a skewed distribution in the range [3.7%, 55%] and with a median of 18%. We conclude that the method yields promising results that are consistent with expectations. The relatively high precision of the method may enable novel applications such as treatment monitoring.
Electronic structure correspondence of singlet-triplet scale separation in strained Sr2RuO4
Creators: name: Acharya, Swagata
name: Pashov, Dimitar
name: Chachkarova, Elena
name: Van Schilfgaarde, Mark
name: Weber, Cédric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: At a temperature of roughly 1\,K, \ce{Sr2RuO4} undergoes a transition from a normal Fermi liquid to a superconducting phase. Even while the former is relatively simple and well understood, the superconducting state is not even after 25 years of study. More recently it has been found that critical temperatures can be enhanced by application of uniaxial strain, up to a critical strain, after which it falls off. In this work, we take an `instability' approach and seek for divergences in susceptibilities. This provides an unbiased way to distinguish tendencies to competing ground states. We show that in the unstrained compound the singlet and triplet instabilities of the normal Fermi liquid phase are closely spaced. Under uniaxial strain electrons residing on all orbitals contributing to the Fermiology become more coherent while the electrons of Ru-$d_{xy}$ character become heavier and electrons of Ru-$d_{xz,yz}$ characters become lighter. In the process, Im\,$χ(\mathbf{q},ω)$ increases rapidly around the incommensurate vector $\mathbf{q}{=}(0.3,0.3,0)2π/a$ while it gets suppressed at all other commensurate vectors, in particular at $q{=}0$, which is essential for spin-triplet superconductivity. Thus the triplet superconducting instability remains the lagging instability of the system and the singlet instability enhances under strain, leading to a large energy-scale separation between these competing instabilities. At large strain an instability to a spin density wave overtakes the superconducting one. The analysis relies on a high-fidelity, \emph{ab initio} description of the one-particle properties and two-particle susceptibilities, based on the Quasiparticle Self-Consistent \emph{GW} approximation augmented by Dynamical Mean Field theory. This approach is described and its high fidelity confirmed by comparing to observed one- and two-particle properties.
description: 9 pages. 4 figures
Strong and complex electron-lattice correlation in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$
Creators: name: Gweon, G. -H.
name: Zhou, S. Y.
name: Watson, M. C.
name: Sasagawa, T.
name: Takagi, H.
name: Lanzara, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the nature of electron-lattice interaction in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ samples, using isotope effect (IE) in angle resolved photoemission spectroscopy (ARPES) data. The IE in the ARPES line width and the IE in the ARPES dispersion are both quite large, implying a strong electron-lattice correlation. The strength of the electron-lattice interaction is ``intermediate,'' i.e. stronger than the Migdal-Eliashberg regime but weaker than the small polaron regime, requiring a more general picture of the ARPES ``kink'' than the commonly used Migdal-Eliashberg picture. The two IEs also imply a complex interaction, due to their strong momentum dependence and their differing sign behaviors. In sum, we propose an intermediate-strength coupling of electrons to localized lattice vibrations via charge density fluctuations.
Spin-dependent potentials from lattice QCD
Creators: name: Koma, Yoshiaki
name: Koma, Miho
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The spin-dependent corrections to the static inter-quark potential are phenomenologically relevant to describing the fine and hyperfine spin splitting of the heavy quarkonium spectra. We investigate these corrections, which are represented as the field strength correlators on the quark-antiquark source, in SU(3) lattice gauge theory. We use the Polyakov loop correlation function as the quark-antiquark source, and by employing the multi-level algorithm, we obtain remarkably clean signals for these corrections up to intermediate distances of around 0.6 fm. Our observation suggests several new features of the corrections.
description: 36 pages, 22 figures, version to appear in Nucl. Phys. B
Semiclassical Nonconcentration near Hyperbolic Orbits
Creators: name: Christianson, Hans
Publisher: name: arXiv
Year: 2006
Subjects: subject: Spectral Theory (math.SP)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35P20

description: For a large class of semiclassical pseudodifferential operators, including Schrödinger operators, $ P (h) = -h^2 Δ_g + V (x) $, on compact Riemannian manifolds, we give logarithmic lower bounds on the mass of eigenfunctions outside neighbourhoods of generic closed hyperbolic orbits. More precisely we show that if $ A $ is a pseudodifferential operator which is microlocally equal to the identity near the hyperbolic orbit and microlocally zero away from the orbit, then \[ \| u \| \leq C (\sqrt{\log(1/h)}/ h) \| P (h)u \| + C \sqrt {\log(1/h)} \| (I - A) u \| . \] This generalizes earlier estimates of Colin de Verdière-Parisse \cite{CVP} obtained for a special case, and of Burq-Zworski \cite{BZ} for real hyperbolic orbits.
description: 45 pages, 5 figures
title: From fragmentation to integration
title: an interpretive analysis of entrepreneurial learning during social engagement
titleType: Subtitle
Creators: name: Carter, Jenni
Publisher: name: Lancaster University
Year: 2019
Subjects: Entrepreneur
Entrepreneurial learning
Social engagement
Social learning

description: Existing entrepreneurial learning literature is fragmented, with a divide between cognitive-, practice- and social-experiential approaches. Of these, social-experiential approaches have received the least attention. Despite a general agreement between scholars that social networks play an important part in entrepreneurship and entrepreneurial learning, the role of social interactions in entrepreneurial learning is underdeveloped. The aim of this research is to explore this gap and provide insights into the role of social interactions in entrepreneurial learning, how entrepreneurial learning during social engagement can be aided and/or impeded, the outcomes of entrepreneurial learning during social engagement, and how learning during social engagement benefits entrepreneurs. An interpretive approach, influenced by a social constructionist epistemology, underpinned the research, which comprised semi-structured qualitative interviews with 17 entrepreneurs across 15 companies. The data was analysed using thematic networks – a process which involved six steps across three levels of interpretation. This revealed three core principles: firstly, multiple, interwoven social interactions combine with other learning mechanisms and influencers for entrepreneurs to learn; secondly, learning during social engagement results in multi-layered and intertwined outcomes; and thirdly, learning during social engagement is contextually dependent and affected by various factors. These principles are interlinked; the first principle is foundational as it reflects how entrepreneurs learn (i.e. in a variety of learning sequences), with the other principles stemming from this to give a wider picture of entrepreneurial learning during social engagement. This thesis contributes to entrepreneurial learning literature by providing insight in three ways. Firstly, by demonstrating a need for integration rather than fragmentation within entrepreneurial learning. Secondly, by extending Bingham and Davis’ (2012) framework of learning sequences. Finally, in the presentation of a new model of entrepreneurial learning during social engagement, developed to show the interlinkage of the three principles identified in this study.
Superconductivity and a Mott Transition in a Hubbard Model on an Anisotropic Triangular Lattice
Creators: name: Watanabe, Tsutomu
name: Yokoyama, Hisatoshi
name: Tanaka, Yukio
name: Inoue, Jun-ichiro
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: A half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t' in the other) is studied using an optimization variational Monte Carlo method, to consider the Mott transition and superconductivity arising in κ-BEDT-TTF_2X. Adopting wave functions with doublon-holon binding factors, we reveal that a first-order Mott (conductor-to-nonmagnetic insulator) transition takes place at U=U_c approximately of the band width, for a wide range of t'/t. This transition is not directly connected to magnetism. Robust d-wave superconductivity appears in a restricted parameter range: immediately below U_c and moderate strength of frustration (0.4\lsim t'/t\lsim 0.7), where short-range antiferromagnetic correlation sufficiently develops but does not come to a long-range order. The relevance to experiments is also discussed.
description: 15 pages, 17 figures, submitted to J. Phys. Soc. Jpn
Temperature-dependent elastic properties of binary and multicomponent high-entropy refractory carbides
Creators: name: Sangiovanni, D. G.
name: Tasnádi, F.
name: Harrington, T.
name: Vecchio, K. S.
name: Abrikosov, I. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Available information concerning the elastic moduli of refractory carbides at temperatures (T) of relevance for practical applications is sparse and/or inconsistent. We carry out ab initio molecular dynamics (AIMD) simulations at T = 300, 600, 900, and 1200 K to determine the temperature-dependences of the elastic constants of rocksalt-structure (B1) TiC, ZrC, HfC, VC, and TaC compounds as well as multicomponent high-entropy carbides (Ti,Zr,Hf,Ta,W)C and (V,Nb,Ta,Mo,W)C. The second order elastic constants are calculated by least-square fitting of the analytical expressions of stress vs. strain relationships to simulation results obtained from three tensile and three shear deformation modes. Moreover, we employ sound velocity measurements to evaluate the bulk, shear, elastic moduli and Poisson's ratios of single-phase B1 (Ti,Zr,Hf,Ta,W)C and (V,Nb,Ta,Mo,W)C at ambient conditions. Our experimental results are in excellent agreement with the values obtained by AIMD simulations. In comparison with the predictions of previous ab initio calculations - where the extrapolation of finite-temperature elastic properties accounted for thermal expansion while neglecting intrinsic vibrational effects - AIMD simulations produce a softening of elastic moduli with T in closer agreement with experiments. Results of our simulations show that TaC is the system which exhibits the highest elastic resistances to both tensile and shear deformation up to 1200 K, and identify the high-entropy (V,Nb,Ta,Mo,W)C system as candidate for applications that require good ductility and toughness at room as well as elevated temperatures.
Μεταθανάτια τεχνητή γονιμοποίηση μετά τους Ν. 3089/2002 και 3305/2005:
Creators: name: Ποϊριατζίδου, Δέσποινα Θεμιστοκλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Μεταθανάτια
Υποβοηθούμενη
Αναπαραγωγή
Post death artificial fertilization

description: Με τον Ν. 3089/2002 ρυθμίστηκε στο άρθρο 1457 του Αστικού Κώδικα η μεταθανάτια τεχνητή γονιμοποίηση. Μεταθανάτια τεχνητή γονιμοποίηση είναι η δημιουργία απογόνων με τη χρήση κρυοσυντηρημένου γεννητικού υλικού μετά το θάνατο του ενός από τους ενδιαφερόμενους συζύγους ή συντρόφους. Ο Αστικός Κώδικας επιτρέπει τη Μεταθανάτια τεχνητή γονιμοποίηση υπό τέσσερις αυστηρές προϋποθέσεις (ασθένεια, συμβολαιογραφική συναίνεση, χρονικός περιορισμός και δικαστική άδεια). Κατά την ψήφιση του νόμου εκφράστηκαν αντιρρήσεις για το συμφέρον γέννησης ενός «προσχεδιασμένα» ορφανού παιδιού αλλά και επιφυλάξεις όσο αφορά την άσκηση του δικαιώματος αναπαραγωγής μετά το θάνατο του φορέα του. Το παιδί που θα γεννηθεί με την μέθοδο αυτή απολαμβάνει πλήρη κληρονομικά δικαιώματα κατά το άρθρο 1711 εδ β,γ αλλά και αναπτύσσει συγγενικούς δεσμούς με την οικογένεια του αποβιώσαντος γονέα του. Απόλυτη είναι η ταύτιση των έννομων συνεπειών ως προς τη νομική κατάσταση του παιδιού που γεννιέται με την μέθοδο αυτή (εν. μεταθανάτια τεχνητή γονιμοποίηση) από άγαμους γονείς που συμβιώνουν. Η δικαιολογητική βάση του θεσμού αυτού έγκειται στην ανάγκη της συζύγου ή συντρόφου που επιζεί να αποκτήσει παιδί που θα κατάγεται βιολογικά από τον θανόντα σύντροφο ή σύζυγο με τον οποίο συνδέονταν έντονα συναισθηματικά.
description: With L. 3089/2002 the post death artificial fertilization had been regulated at article 1457 του Civil code. The post death artificial fertilization is the descendant creation via the cryopreserved genetic material of one of the husbands or partners after his or her death. This procedure is permitted by Civil Code only under four firm conditions (illness, συμβολαιογραφική consent, time restriction, judicial permission). The voting of the legislation met with opposition that challenged the advantages and interest of the action of giving birth to an orphan. Misgivings were also expressed which concerned the right of a person to create descendants after his or her death. According to article 1711 verse β,γ, the child that is going to be born with this procedure has fully inheritance rights. In addition, it is related to the family of its dead parent. The same legislation applies to a child born with the post death artificial fertilization procedure from parents that were never married to each other but were living together. The necessity of such legislation consists in the need of the husband or partner to have children that would be genetically related to the dead parent, whom she was emotionally connected with.
Strong disorder fixed points in the two-dimensional random-bond Ising model
Creators: name: Picco, Marco
name: Honecker, Andreas
name: Pujol, Pierre
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The random-bond Ising model on the square lattice has several disordered critical points, depending on the probability distribution of the bonds. There are a finite-temperature multicritical point, called Nishimori point, and a zero-temperature fixed point, for both a binary distribution where the coupling constants take the values +/- J and a Gaussian disorder distribution. Inclusion of dilution in the +/- J distribution (J=0 for some bonds) gives rise to another zero-temperature fixed point which can be identified with percolation in the non-frustrated case (J >= 0). We study these fixed points using numerical (transfer matrix) methods. We determine the location, critical exponents, and central charge of the different fixed points and study the spin-spin correlation functions. Our main findings are the following: (1) We confirm that the Nishimori point is universal with respect to the type of disorder, i.e. we obtain the same central charge and critical exponents for the +/- J and Gaussian distributions of disorder. (2) The Nishimori point, the zero-temperature fixed point for the +/- J and Gaussian distributions of disorder, and the percolation point in the diluted case all belong to mutually distinct universality classes. (3) The paramagnetic phase is re-entrant below the Nishimori point, i.e. the zero-temperature fixed points are not located exactly below the Nishimori point, neither for the +/- J distribution, nor for the Gaussian distribution.
description: final version to appear in JSTAT; minor changes
title: ÐÐ¾Ð³Ð½Ð¸ÑÐ¸Ð²Ð½Ð¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²Ð° Ð¸ Ð¿ÐµÑÐµÑÐ°Ð±Ð¾ÑÐºÐ¸ Ð·ÐµÑÐ½Ð¾Ð²ÑÑ Ð½Ð° Ð±Ð°Ð·Ðµ Ð·ÐµÑÐ½Ð¾Ð²Ð¾Ð³Ð¾ ÐºÐ»Ð°ÑÑÐµÑÐ° ÐÑÐ°ÑÐ½Ð¾Ð´Ð°ÑÑÐºÐ¾Ð³Ð¾ ÐºÑÐ°Ñ
title: Cognitive modeling of grain production and processing on the basis of the grain cluster of the Krasnodar territory
Creators: name: ÐÐ°Ð½ÑÐµÐ»ÐµÐµÐ²Ð°, ÐÐ°ÑÐ¸Ñ
name: "Ð¡Ð¸ÑÑÐµÐ¼Ð½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· Ð² Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ð¸ Ð¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ð¸", Ð¼ÐµÐ¶Ð´ÑÐ½Ð°ÑÐ¾Ð´Ð½Ð°Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ°Ñ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ (27; 2023; Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³)
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2024
Subjects: Ð¡Ð¸ÑÑÐµÐ¼Ð½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð·
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ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ
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ÐºÐ¾Ð³Ð½Ð¸ÑÐ¸Ð²Ð½Ð°Ñ Ð¼Ð¾Ð´ÐµÐ»Ñ
Ð¸Ð¼Ð¿ÑÐ»ÑÑÐ½ÑÐ¹ Ð¿ÑÐ¾ÑÐµÑÑ
ÑÐ»Ð¾Ð¶Ð½ÑÐµ ÑÐ¸ÑÑÐµÐ¼Ñ
ÑÑÐ°ÑÐ¸Ð¾Ð½Ð°ÑÐ½Ð¾ÑÑÑ
Ð·ÐµÑÐ½Ð¾Ð²ÑÐµ ÐºÑÐ»ÑÑÑÑÑ
cognitive model
impulse process
complex systems
stationarity
grain crops

description: Ð ÑÑÐ°ÑÑÐµ ÑÐ°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÑÑÑÑ Ð²Ð¾Ð¿ÑÐ¾ÑÑ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¿ÑÐ¾ÑÐµÑÑÐ° Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²Ð° Ð·ÐµÑÐ½Ð¾Ð²ÑÑ. ÐÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½ ÑÐ¸Ð½ÑÐµÐ· Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ ÐºÐ¾Ð³Ð½Ð¸ÑÐ¸Ð²Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¸ ÑÐµÐ¾ÑÐ¸Ð¸ ÑÑÐ¾ÑÐ°ÑÑÐ¸ÑÐµÑÐºÐ¸Ñ Ð¼Ð½Ð¾Ð³Ð¾Ð¼ÐµÑÐ½ÑÑ Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÑÑÐ´Ð¾Ð² Ð´Ð»Ñ Ð²ÑÑÐ²Ð»ÐµÐ½Ð¸Ñ Ð·Ð°ÐºÐ¾Ð½Ð¾Ð¼ÐµÑÐ½Ð¾ÑÑÐµÐ¹ Ð¸ Ð¿Ð¾ÑÑÑÐ¾ÐµÐ½Ð¸Ñ ÑÑÐµÐ½Ð°ÑÐ¸ÐµÐ² ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ.
description: The article discusses the issues of modeling the grain production process. A synthesis of the use of cognitive modeling and the theory of stochastic multidimensional time series to identify patterns and build development scenarios is proposed.
Diffusive search for a stochastically-gated target with resetting
Creators: name: Bressloff, Paul C
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this paper, we analyze the mean first passage time (MFPT) for a single Brownian particle to find a stochastically-gated target under the additional condition that the position of the particle is reset to a fixed position $\x_r$ at a rate $r$. The gate switches between an open and closed state according to a two-state Markov chain and can only be detected by the searcher in the open state. One possible example of such a target is a protein switching between different conformational states. As expected, the MFPT with or without resetting is an increasing function of the fraction of time $ρ_0$ that the gate is closed. However, the interplay between stochastic resetting and stochastic gating has non-trivial effects with regards the optimization of the search process under resetting. First, by considering the diffusive search for a gated target at one end of an interval, we show that the fractional change in the MFPT under resetting exhibits a non-monotonic dependence on $ρ_0$. In particular, the percentage reduction of the MFPT at the optimal resetting rate (when it exists) increases with $ρ_0$ up to some critical value, after which it decreases and eventually vanishes. Second, in the case of a spherical target in $\R^d$, the dependence of the MFPT on the spatial dimension $d$ is significantly amplified in the presence of stochastic gating.
description: 17 pages, 9 figures
An improved Gauge Unfixing formalism and the Abelian Pure Chern Simons Theory
Creators: name: Neto, Jorge Ananias
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a variant scheme of the Gauge Unfixing formalism which modifies directly the original phase space variables of a constrained system. These new variables are gauge invariant quantities. We apply our procedure in a mixed constrained system that is the Abelian Pure Chern Simons Theory where several gains are obtained. In particular, from the gauge invariant Hamiltonian and using the inverse Legendre transformation, we obtain the same initial Abelian Pure Chern Simons Lagrangian as the gauge invariant Lagrangian. This result shows that the gauge symmetry of the action is certainly preserved.
description: revised version. To appear in Brazilian Journal of Physics
Deep learning for biomedical photoacoustic imaging: A review
Creators: name: Gröhl, Janek
name: Schellenberg, Melanie
name: Dreher, Kris
name: Maier-Hein, Lena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Medical Physics (physics.med-ph)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Photoacoustic imaging (PAI) is a promising emerging imaging modality that enables spatially resolved imaging of optical tissue properties up to several centimeters deep in tissue, creating the potential for numerous exciting clinical applications. However, extraction of relevant tissue parameters from the raw data requires the solving of inverse image reconstruction problems, which have proven extremely difficult to solve. The application of deep learning methods has recently exploded in popularity, leading to impressive successes in the context of medical imaging and also finding first use in the field of PAI. Deep learning methods possess unique advantages that can facilitate the clinical translation of PAI, such as extremely fast computation times and the fact that they can be adapted to any given problem. In this review, we examine the current state of the art regarding deep learning in PAI and identify potential directions of research that will help to reach the goal of clinical applicability
description: 31 pages, 8 figures, 3 tables, 169 references