cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electrical conduction of Ti/TiOx/Ti structures at low temperatures and high magnetic fields
Creators: name: Batkovaa, Marianna
name: Batko, Ivan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present results of electrical conduction studies of Ti/TiOx/Ti planar structures prepared by tip-induced local anodic oxidation (LAO) of titanium thin films. The prepared structures have shown almost linear I-V curves at temperatures between 300 K and 30 K, and only slight deviation from linear behaviour at lower temperatures. Electrical conductance of the structures can be adequately explained by a two-channel model where variable range hopping channels and metallic ones coexist in parallel, while a crossover from Mott to Efros-Shklovskii variable-range-hopping conductivity has been observed at decreasing temperature. The magnetoresistance of the studied structures is very small even in magnetic fields up to 9 T. The reported electrical properties of the structures indicate their promising applications as very low heat capacity temperature sensors for cryogenic region and high magnetic fields.
การประยุกต์ใช้วิธีพื้นผิวตอบสนองในการวิเคราะห์ทางสถิติสำหรับการบำบัดน้ำเสียจากโรงงานยางพาราด้วยกระบวนการโอโซเนชัน
Creators: name: วิภาดา เดชะปัญญา
Publisher: name: King Mongkut’s University of Technology Thonburi
Year: 2023
Subjects: Para Rubber Wastewater
Ozonation
Response Surface Methodology (RSM)
Central Composite Design (CCD) Model

description: KMUTT Research and Development Journal, 46, 4, 387-401
Impact of orbital orientations and radii on TianQin constellation stability
Creators: name: Tan, Zhuangbin
name: Ye, Bobing
name: Zhang, Xuefeng
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: TianQin is a proposed space-based gravitational-wave observatory mission to be deployed in high circular Earth orbits. The equilateral-triangle constellation, with a nearly fixed orientation, can be distorted primarily under the lunisolar perturbations. To accommodate science payload requirements, one must optimize the orbits to stabilize the configuration in terms of arm-length, relative velocity, and breathing angle variations. In this work, we present an efficient optimization method and investigate how changing the two main design factors, i.e., the orbital orientation and radius, impacts the constellation stability through single-variable studies. Thereby, one can arrive at the ranges of the orbital parameters that are comparatively more stable, which may assist future refined orbit design.
On the spectra and distance scale of short Gamma Ray--Bursts
Creators: name: Ghirlanda, Giancarlo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I discuss the spectral properties of short GRBs detected by BATSE and compare them with long events. The detailed modeling of short GRB spectra shows that their being (on average) harder than long events (as it has been found by comparing their hardness ratios) is indeed due to a harder low energy spectral component (i.e. the powerlaw of the Band or cutoff-powerlaw model) in short GRBs which, instead, have a peak energy similar to long events. Another open issue is the distance scale to short GRBs. While the few redshift measurements suggests that they are at z<1, statistical studies (with local galaxies or X-ray selected clusters) suggest that they should be even more local.
description: To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9, 2006. To appear in "Il Nuovo Cimento"
A Heating Model for the Millennium Gas Run
Creators: name: Gazzola, L.
name: Pearce, F. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The comparison between observations of galaxy clusters thermo-dynamical properties and theoretical predictions suggests that non-gravitational heating needs to be added into the models. We implement an internally self-consistent heating scheme into GADGET-2 for the third (and fourth) run of the Millennium gas project (Pearce et al. in preparation), a set of four hydrodynamical cosmological simulations with N=2(5x10^8) particles and with the same volume (L=500 h-1 Mpc) and structures as the the N-body Millennium Simulation (Springel et al. 2005). Our aim is to reproduce the observed thermo-dynamical properties of galaxy clusters.
description: 3 pages, 2 figures, To appear in the Proceedings of "Heating vs. Cooling in Galaxies and Clusters of Galaxies", August 2006, Garching (Germany)
Uncovering the origin of the emitting states in Bi3+-activated CaMO3 (M = Zr, Sn, Ti) perovskites: metal-to-metal charge transfer versus s-p transitions
Creators: name: Back, Michele
name: Ueda, Jumpei
name: Xu, Jian
name: Asami, Kazuki
name: Amidani, Lucia
name: Trave, Enrico
name: Tanabe, Setsuhisa
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: After more than a century of studies on the optical properties of Bi3+ ions, the assignment of the nature of the emissions and the bands of the absorption spectra remain ambiguous. Here, we report an insight into the spectroscopy of Bi3+-activated CaMO3 perovskites (M = Zr, Sn, and Ti), discussing the factors driving the metal-to-metal charge transfer and sp -> s2 transitions. With the aim to figure out the whole scenario, a combined experimental and theoretical approach is employed. The comparison between the temperature dependence of the photoluminescence emissions with the temperature dependence of the exciton energy of the systems has led to an unprecedented evidence of the chargetransfer character of the emitting states in Bi3+-activated phosphors. Low-temperature vacuum ultraviolet spectroscopy together with the design of the vacuum-referred binding energy diagram of the luminescent center is exploited to shed light on the origin of the absorption bands. In addition, the X-ray absorption near the edge structure unambiguously confirmed the stabilization of Bi3+ in the Ca2+ site in both CaSnO3 and CaZrO3 perovskites. This breakthrough into the understanding of the excited-state origin of Bi3+ could pave the way toward the design of a new generation of effective Bi3+-activated phosphors.
On the fraction of X-ray obscured quasars in the local universe
Creators: name: Wang, J. X.
name: Jiang, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent wide area hard X-ray and soft Gamma ray surveys have shown that the fraction of X-ray obscured AGNs in the local universe significantly decreases with intrinsic luminosity. In this letter we point out that two correction have to be made to the samples: 1) radio loud AGNs have to be excluded since their X-ray emission might be dominated by the jet component; 2) Compton thick sources have to be excluded too since their hard X-ray and soft gamma ray emission are also strongly attenuated by Compton scattering. The soft gamma-ray selected AGN samples obtained by SWIFT and INTEGRAL provide the best opportunity to study the fraction of obscured AGN in the local universe in the least biased way. We choose these samples to check if the corrections could alter the above result on the fraction of obscured AGNs. We find that before the corrections both samples show significant anti-correlation between L_X and N_H, indicating obvious decrease in the fraction of obscured AGNs with luminosity. However, after the corrections, we find only marginal evidence of anti-correlation (at 98% confidence level) in the SWIFT sample, and no evidence at all in the INTEGRAL sample which consists of comparable number of objects. We conclude that current samples only show a marginal decrease in the fraction of obscured AGNs in the local universe, and much larger samples are required to reach a more robust conclusion.
description: 13 pages, including 4 figures, ApJ letter accepted
Application of AI-based Models for Online Fraud Detection and Analysis
Creators: name: Papasavva, Antonis
name: Johnson, Shane
name: Lowther, Ed
name: Lundrigan, Samantha
name: Mariconti, Enrico
name: Markovska, Anna
name: Tuptuk, Nilufer
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Fraud is a prevalent offence that extends beyond financial loss, causing psychological and physical harm to victims. The advancements in online communication technologies alowed for online fraud to thrive in this vast network, with fraudsters increasingly using these channels for deception. With the progression of technologies like AI, there is a growing concern that fraud will scale up, using sophisticated methods, like deep-fakes in phishing campaigns, all generated by language generation models like ChatGPT. However, the application of AI in detecting and analyzing online fraud remains understudied. We conduct a Systematic Literature Review on AI and NLP techniques for online fraud detection. The review adhered the PRISMA-ScR protocol, with eligibility criteria including relevance to online fraud, use of text data, and AI methodologies. We screened 2,457 academic records, 350 met our eligibility criteria, and included 223. We report the state-of-the-art NLP techniques for analysing various online fraud categories; the training data sources; the NLP algorithms and models built; and the performance metrics employed for model evaluation. We find that current research on online fraud is divided into various scam activitiesand identify 16 different frauds that researchers focus on. This SLR enhances the academic understanding of AI-based detection methods for online fraud and offers insights for policymakers, law enforcement, and businesses on safeguarding against such activities. We conclude that focusing on specific scams lacks generalization, as multiple models are required for different fraud types. The evolving nature of scams limits the effectiveness of models trained on outdated data. We also identify issues in data limitations, training bias reporting, and selective presentation of metrics in model performance reporting, which can lead to potential biases in model evaluation.
description: Manuscript accepted in Crime Science Journal. Please cite accordingly
In viaggio verso Nicea: Costantino tra pagani, donatisti e ariani
Creators: name: Lizzi Testa, Rita
Publisher: name: Apulia Theologica
Year: 2025

description: Nel contributo sono esanimati i principali eventi politico-religiosi, che segnarono il percorso di Costantino dalla sua acclamazione al concilio di Nicea. L'attenzione è rivolta, dunque, anche al modo in cui l'imperatore tentò di risolvere lo scisma donatista con due sinodi, che anticiparono quello di Nicea. Ne risulta confermata la grande abilità di mediazione mostrata da Costantino, che seppe suscitare l'adesione al suo governo sia dei cristiani sia dei pagani attraverso speciali privilegi fiscali, da cui donatisti e ariani furono esclusi, e un ampio programma di costruzioni sacre (chiese e templi per il culto imperiale). Qualche riflessione è anche rivolta ai tentativi imperiali di sedare la controversia cristologica, accesasi in Alessandria e già dilagata in tutto l'oriente, mediante interventi epistolari che invocavano la necessità di mantenere l'unità religiosa perché da quella dipendeva la pace e la prosperità dell'impero. Per questa fase precedente all'organizzazione del concilio, tuttavia, il racconto eusebiano sembra alquanto sospetto.
description: Apulia Theologica, V. 10 N. 2 (2024): Apulia theologica vol. 10, fascicolo 2
The market efficiency in the stock markets
Creators: name: Yang, Jae-Suk
name: Kwak, Wooseop
name: Kaizoji, Taisei
name: Kim, In-mook
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We study the temporal evolution of the market efficiency in the stock markets using the complexity, entropy density, standard deviation, autocorrelation function, and probability distribution of the log return for Standard and Poor's 500 (S&P 500), Nikkei stock average index, and Korean composition stock price index (KOSPI). Based on the microscopic spin model, we also find that these statistical quantities in stock markets depend on the market efficiency.
description: 8 pages, 5 figures
Κοινωνικές και Ηθικές Διαστάσεις των εξελίξεων των Νευροεπιστημών:
Creators: name: Γκιβόγκλη, Πολυξένη (Gjivogli, Polikseni) Θοδωρή
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Νευροηθική
Εγκεφαλική ενίσχυση
Ελεύθερη βούληση
Neuroethics
Brain enhancement
Free will

description: Ο σκοπός της παρούσας διπλωματικής εργασίας είναι να παρουσιάσει τα σύγχρονα επιτεύγματα στον τομέα των νευροεπιστημών, και να εξετάσει τα ηθικά και κοινωνικά ζητήματα που ανακύπτουν από αυτά. Αποτέλεσμα της εντυπωσιακής ανάπτυξης που έχει παρατηρηθεί τα τελευταία χρόνια στις νευροεπιστήμες είναι ο επαναπροσδιορισμός των απόψεων μας για τις βασικές εγκεφαλικές λειτουργίες όπως η αντίληψη, η προσοχή, η μνήμη καθώς και o επαναπροσδιορισμός εννοιών όπως είναι η ελεύθερη βούληση, η υπαιτιότητα, η συνείδηση και η αίσθηση της προσωπικής ταυτότητας. Με την εφαρμογή των νέων διαγνωστικών και θεραπευτικών μεθόδων ελπίζουμε ότι σε ένα κοντινό μέλλον, θα μπορούμε να δούμε και να αλλάξουμε την συμπεριφορά των ανθρώπων και να ενισχύσουμε τεχνητά σε μεγάλο βαθμό τις εγκεφαλικές λειτουργίες. Είναι σαφές, ότι με την παραπάνω επιστημονική και τεχνολογική πρόοδο ανακύπτουν ηθικά και δεοντολογικά προβλήματα με κοινωνικές, νομικές και ασφαλιστικές επιπτώσεις.
description: The aim of this postgraduate paper is to present the contemporary neuroscientific achievements and to examine the ethical and social problems that arise from them. A consequence of this impressive development, that we observe these last years in neuroscience, is the redefinition of our point of view for the very basic brain functions like, discernment, wariness, memory and the redefinition of concepts like free will, responsibility, consciousness and sense of the personal identity. By applying the newest diagnostic and therapeutic methods, we hope that in the future we will see and change human behavior and enchase the functions of the brain. It is clear that with this scientific and technological development arise ethical and deontological problems with social, legal and insurance reverberations.
Immersive Interactive Quantum Mechanics for Teaching and Learning Chemistry
Creators: name: Weymuth, Thomas
name: Reiher, Markus
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics Education (physics.ed-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Popular Physics (physics.pop-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The impossibility of experiencing the molecular world with our senses hampers teaching and understanding chemistry because very abstract concepts (such as atoms, chemical bonds, molecular structure, reactivity) are required for this process. Virtual reality, especially when based on explicit physical modeling (potentially in real time), offers a solution to this dilemma. Chemistry teaching can make use of advanced technologies such as virtual-reality frameworks and haptic devices. We show how an immersive learning setting could be applied to help students understand the core concepts of typical chemical reactions by offering a much more intuitive approach than traditional learning settings. Our setting relies on an interactive exploration and manipulation of a chemical system; this system is simulated in real-time with quantum chemical methods, and therefore, behaves in a physically meaningful way.
description: 16 pages, 4 figures
Cosmic Evolution with Early and Late Acceleration Inspired by Dual Nature of the Ricci Scalar Curvature
Creators: name: Srivastava, S. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the present paper, it is found that dark energy emerges spontaneously from the modified gravity. According to cosmological scenario, obtained here, the universe inflates for $\sim 10^{-37}$ sec. in the beginning and late universe accelerates after 8.58 Gyrs. During the long intermediate period, it decelerates driven by radiation and subsequently by matter. Emerged gravitational dark energy mimics quintessence and its density falls by 115 orders from its initial value $2.58\times 10^{68} {\rm GeV}^4$ to its current value $2.19\times 10^{-47} {\rm GeV}^4$ .
description: 40 pages. To appearin Int. J. Mod. Phys. D
Μετασχηματισμός Riesz επί πολλαπλοτήτων:
Creators: name: Ιωαννίδης, Γεώργιος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Μετασχηματισμός Riesz
Τοπικά συμμετρικοί χώροι
Πολλαπλότητες Riemann
Riesz transform
Locally symmetric spaces
Riemannian manifolds

description: Στόχος της διατριβής ήταν η μελέτη του μετασχηματισμού Riesz επί πολλαπλοτήτων και συγκεκριμένα επί τοπικά συμμετρικών χώρων Μ. Θέλουμε να δείχνουμε ότι ο μετασχηματισμός Riesz είναι συνεχής και φραγμένος επί του για κάθε p να ανήκει σε διάστημα της μορφής , με 1< <2< 1.
description: The main aim of the present thesis was to study the Riesz transform over manifolds, locally symmetric spaces M, to be specific. We want to prove that Riesz transform is L^(p )bounded for every p in (r_1,r_2) with certain 11.
Extracting Pasture Phenotype and Biomass Percentages using Weakly Supervised Multi-target Deep Learning on a Small Dataset
Creators: name: Narayanan, Badri
name: Saadeldin, Mohamed
name: Albert, Paul
name: McGuinness, Kevin
name: Mac Namee, Brian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The dairy industry uses clover and grass as fodder for cows. Accurate estimation of grass and clover biomass yield enables smart decisions in optimizing fertilization and seeding density, resulting in increased productivity and positive environmental impact. Grass and clover are usually planted together, since clover is a nitrogen-fixing plant that brings nutrients to the soil. Adjusting the right percentages of clover and grass in a field reduces the need for external fertilization. Existing approaches for estimating the grass-clover composition of a field are expensive and time consuming - random samples of the pasture are clipped and then the components are physically separated to weigh and calculate percentages of dry grass, clover and weeds in each sample. There is growing interest in developing novel deep learning based approaches to non-destructively extract pasture phenotype indicators and biomass yield predictions of different plant species from agricultural imagery collected from the field. Providing these indicators and predictions from images alone remains a significant challenge. Heavy occlusions in the dense mixture of grass, clover and weeds make it difficult to estimate each component accurately. Moreover, although supervised deep learning models perform well with large datasets, it is tedious to acquire large and diverse collections of field images with precise ground truth for different biomass yields. In this paper, we demonstrate that applying data augmentation and transfer learning is effective in predicting multi-target biomass percentages of different plant species, even with a small training dataset. The scheme proposed in this paper used a training set of only 261 images and provided predictions of biomass percentages of grass, clover, white clover, red clover, and weeds with mean absolute error of 6.77%, 6.92%, 6.21%, 6.89%, and 4.80% respectively.
Two-Loop Ultrasoft Running of the O(v^2) QCD Quark Potentials
Creators: name: Hoang, Andre H.
name: Stahlhofen, Maximilian
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The two-loop ultrasoft contributions to the next-to-leading logarithmic (NLL) running of the QCD potentials at order v^2 are determined. The results represent an important step towards the next-to-next-to-leading logarithmic (NNLL) description of heavy quark pair production and annihilation close to threshold.
description: 13 pages, 3 figures; typos corrected, reference added, information on cross checks added on page 7; acknowledgments added
Error-prone PCR 1st and 2st rounds
Creators: name: Song, Lifu
Publisher: name: figshare
Year: 2021
Subjects: subject: Uncategorized
subject: 80301 Bioinformatics Software
subject: FOS: Computer and information sciences
subject: 60102 Bioinformatics

description: Sequencing results of first and second rounds of error-prone PCRs.
YC10_5_1 First round error-prone PCR.YC10_5_2 Second round error-prone PCR.
An explicit formula for Witten's 2-correlators
Creators: name: Zograf, Peter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: An explicit closed form expression for 2-correlators of Witten's two dimensional topological gravity is derived in arbitrary genus.
description: Some typos in the published version corrected
The K-theoretic Farrell-Jones Conjecture for hyperbolic groups
Creators: name: Bartels, Arthur
name: Lueck, Wolfgang
name: Reich, Holger
Publisher: name: arXiv
Year: 2007
Subjects: subject: K-Theory and Homology (math.KT)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 19Dxx, 19A31,19B28

description: We prove the K-theoretic Farrell-Jones Conjecture for hyperbolic groups with (twisted) coefficients in any associative ring with unit.
description: 33 pages; final version; to appear in Invent. Math
New mercury-manganese stars and candidates from LAMOST DR4
Creators: name: Paunzen, E.
name: Huemmerich, S.
name: Bernhard, K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The present work presents our efforts at identifying new mercury-manganese (HgMn/CP3) stars using spectra obtained with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Suitable candidates were searched for among pre-selected early-type spectra from LAMOST DR4 using a modified version of the MKCLASS code that probes several Hg II and Mn II features. The spectra of the resulting 332 candidates were visually inspected. Using parallax data and photometry from Gaia DR2, we investigated magnitudes, distances from the Sun, and the evolutionary status of our sample stars. We also searched for variable stars using diverse photometric survey sources. We present 99 bona fide CP3 stars, 19 good CP3 star candidates, and seven candidates. Our sample consists of mostly new discoveries and contains, on average, the faintest CP3 stars known (peak distribution 9.5 < G < 13.5 mag). All stars are contained within the narrow spectral temperature-type range from B6 to B9.5, in excellent agreement with the expectations and the derived mass estimates (2.4 < M(Sun) < 4 for most objects). Our sample stars are between 100 Myr and 500 Myr old and cover the whole age range from zero-age to terminal-age main sequence. They are almost homogeneously distributed at fractional ages on the main sequence < 80%, with an apparent accumulation of objects between fractional ages of 50% to 80%. We find a significant impact of binarity on the mass and age estimates. Eight photometric variables were discovered, most of which show monoperiodic variability in agreement with rotational modulation. Together with the recently published catalogue of APOGEE CP3 stars, our work significantly increases the sample size of known Galactic CP3 stars, paving the way for future in-depth statistical studies.
description: 20 pages, 11 figures, 7 tables, accepted by Astronomy & Astrophysics
Lyman Alpha Constraints on Very Low Luminosity AGN
Creators: name: Dijkstra, Mark
name: Wyithe, Stuart
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent surveys have detected Lya emission from z=4.5-6.5 at luminosities as low as 10^41 erg/s. There is good evidence that low numbers of AGN are among observed faint Lya emitters. Combining these observations with an empirical relation between the intrinsic Lya and B-band luminosities of AGN, we obtain an upper limit on the number density of AGN with absolute magnitudes M_B=[-16,-19] at z=4.5-6.5. These AGN are up to two orders of magnitude fainter than those discovered in the Chandra Deep Field, resulting in the faintest observational constraints to date at these redshifts. At z=4.5, the powerlaw slope of the very faint end of the luminosity function of AGN is shallower than the slope observed at lower redshifts, beta <1.6, at the 98% confidence level. In fact, we find marginal evidence that the luminosity function rises with luminosity, corresponding to a powerlaw slope beta <0, at magnitudes fainter than M_B~-20 (75% confidence level). These results suggest either that accretion onto lower mass black holes is less efficient than onto their more massive counterparts, or that the number of black holes powering AGN with M_B >-20 is lower than expected from the M_BH-sigma relation by one-two orders of magnitude. Extrapolating from reverberation-mapping studies suggests that these black holes would have M_BH=10^6-10^7 Msun. To facilitate the identification of AGN among observed Lya emitters, we derive observational properties of faint AGN in the Lya line, as well as in the X-ray and optical bands.
description: 12 pages, 5 figures. MNRAS in Press
Spontaneous Symmetry Breaking in Superfluid Helium-4
Creators: name: Harada, Junpei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We derive an analytical expression for a critical temperature of spontaneous symmetry breaking in a repulsive hard-core interacting Bose system. We show that the critical temperature of spontaneous symmetry breaking in a hard-core interacting Bose system is determined by the three physical parameters: the density of Bose liquid at absolute zero (rho_0), the mass (m) and the hard sphere diameter (sigma) of a boson. The formula that we have derived is Tc = rho_0 pi hbar^2 sigma / m^2 kB. We report Tc of liquid helium-4 is 2.194 K, which is significantly close to the lambda temperature of 2.1768 K. The deviation between the predicted and experimental values of the lambda temperature is less than 1%.
description: 4 pages, 5 figures; v2 typos corrected, a reference added
Mario Vittorino, un filosofo al servizio dell'ortodossia nicena
Creators: name: Tommasi, Chiara Ombretta
Publisher: name: Apulia Theologica
Year: 2025

description: Il contributo offre una ricostruzione delle principali novità del pensiero teologico di Mario Vittorino, autore di scritti antiariani negli anni '60 del IV secolo, discutendo in particolare la resa latina da lui fornita del simbolo di Nicea.
description: Apulia Theologica, V. 10 N. 2 (2024): Apulia theologica vol. 10, fascicolo 2
A critical review of alternative tourism: full fare tourism? A case study of Mundo Maya
Creators: name: Johnston, Alison M.
Publisher: name: University of British Columbia
Year: 2009

description: Many planners concerned about the serious social and ecological impacts associated with the tourism industry now promote a shade of tourism called 'alternative' tourism. The difference between regular tourism and alternative tourism is that the latter has the connotation of being 'full fare' or sustainable. Generally speaking, alternative tourism is no less exploitive than regular tourism. The set of tourism activities now labelled as 'alternative' is merely a sub-component of the notorious mainstream tourism model. It unleashes the same type of negative social and ecological impacts as regular tourism, because the same planning methodology is employed. Mundo Maya, an alternative tourism program launched in 1990 but marketed before proper planning had taken place, follows this trend. The problems arising from the tourism industry's interpretation of alternative tourism points to a need to revisit the theory of alternative tourism and look to the 'success stories'. If present forms of alternative tourism are not sustainable, then it is vital that a line be drawn between tourism purporting to be alternative tourism and true alternative tourism. Otherwise a valuable body of theory could be discarded on the basis of misguided implementation efforts and opportunistic marketing. Within Mundo Maya, several small-scale independent success stories exist. These illustrate the conditions under which tourism can be 'full fare'. When the gap between the theory and practice of alternative tourism is closed, alternative tourism is a viable and rewarding community development tool.
DEVELOPMENT OF THE ETHNIC ENVIRONMENT STRATEGIES AND SELF-AWARENESS GROWTH
Creators: name: Khan, S.S.
name: Sulaymanov, М.М.
Publisher: name: Zenodo
Year: 2024

description: The issues of studying the history of world diasporas, their identity, strategies for survival and adaptation in a different ethnic environment, as well as relations with recipient states and historical homelands are becoming relevant in modern science; the history of the growth of the national self-consciousness of Koreans, the role of  Korean cultural centers, societies and associations, the consciousness of the Korean community development, the relationship of Koryo saram with Koreans from other countries, the prospects for the development of the Korean diaspora, are still waiting for their researchers.
Global existence for the spherically symmetric Einstein-Vlasov system with outgoing matter
Creators: name: Andreasson, Hakan
name: Kunze, Markus
name: Rein, Gerhard
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We prove a new global existence result for the asymptotically flat, spherically symmetric Einstein-Vlasov system which describes in the framework of general relativity an ensemble of particles which interact by gravity. The data are such that initially all the particles are moving radially outward and that this property can be bootstrapped. The resulting non-vacuum spacetime is future geodesically complete.
description: 16 pages
Square-torsion gravity, dark matter halos and the baryonic Tully-Fisher relation
Creators: name: Mégier, Elias A. S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Square-torsion gravity is applied to the long standing dark matter problem. In this context the theory reduces to General Relativity complemented by a dark stress-energy tensor due to the torsion of spacetime and is studied under the simplifying assumption of spherical symmetry. The dark stress-energy tensor is found to satisfy an anisotropic structure equation. In vacuum this is shown to be equivalent to a wave equation with sources. A natural class of exact solutions is found which explicitly perturbs any seed spacetime metric by a conformal factor satisfying a (1+1)-dimensional wave equation. This leads to the concept of dark coating. The static solutions are then used to construct structures that model dark matter halos surrounding baryonic bodies. In the Newtonian régime the baryonic mass $m_b$ and the flat rotation curve velocity $v_f$ are found to be related by the baryonic Tully-Fisher relation $m_b\propto v_f^4$. The present work proposes thus a possible theoretical motivation of this hitherto purely empirical result. The example of a dark halo on the Schwarzschild geometry is made as a toy model for a galaxy. All qualitative an quantitative features of galactic rotation curves are recovered. A dark halo surrounding a Schwarzschild black hole is found to possess a boundary of staticity called torsion sphere placed between the photon sphere and the event horizon. The phenomenon of dark radiation is briefly exposed. The way for cosmological applications is then opened by showing how Hubble expansion is a natural feature of the theory.
The stability of school effects across academic subjects
Creators: name: Liu, Bing-Zheng
Publisher: name: University of British Columbia
Year: 2009

description: The effects of schooling on the cognitive development of children has been a central theme in educational research (Heyns 1978). One of the problems in this area of research is the stability of school effects. Studies have examined the stability of performance indicators across random samples of students from the same grade level, across subject areas for students at the same grade level, across grade levels at one point in time, and across years for the same grade level. The purpose of this study was to examine the stability of school effects across the curriculum subjects, mathematics, reading, science, and history. This was accomplished by reanalyzing the NELS:88 data, which is a nationally representative sample of nearly 25,000 eighth-grade students attending over 1000 schools in the United States. A major problem for analysts confronted with educational data and achievement outcomes is choosing the most appropriate strategy for analyzing multilevel data. In addition, the stability of school effects across subjects so far has been measured by correlation coefficients, so another problem is how to estimate the covariances among school effects properly. To meet these two challenges, this study used a three-level Hierarchical Linear Model. By adding a within-student level model using dummy coding, the outcomes of different subjects were combined into one equation. This permitted the estimation of the covariance matrices for the original four curriculum subject outcomes at the higher level analyses. The results of this study indicate that there are significant differences between U.S. secondary schools in both their Type A and Type B school effects. In other words, there is significant variation in schooling outcomes between U.S. secondary schools, after controlling for (1) student background only, and (2) both student background and school contextual effects. The results also show that there is a uniformity of both Type A and Type B school effects across outcome measures, that is, schools with superior levels of performance in one curricular subject tend to have superior levels in other subjects even after controlling for (1) student background only, and (2) both student background and school contextual effects.
title: Der Markt von FinTech Unternehmen in Deutschland
Creators: name: Fischer, Lena
name: Zerres, Thomas
Publisher: name: Hochschule Offenburg
Year: 2024

description: Ziel dieser Studie ist es, den Markt von FinTech Unternehmen in Deutschland unter Berücksichtigung der beteiligten Marktkräfte darzustellen. Hierfür sollen die theoretischen Grundlagen einer Marktanalyse dargelegt und darauf aufbauend eine Marktanalyse durchgeführt werden. Betrachtet werden sollen in diesem Zusammenhang auch die rechtlichen Rahmenbedingungen, die für FinTech Unternehmen in Deutschland einschlägig sind, da auch diese Einfluss auf das Marktgeschehen haben. Ziel ist es, bestehende Rechtsgrundlagen sowie Entwürfe von künftigen Rechtsvorschriften mittels Recherche zu identifizieren und zu analysieren. Betrachtet werden sollen dabei das deutsche Recht sowie das für Deutschland als Mitgliedstaat der EU geltende EU-Recht.
description: Arbeitspapiere für Marketing und Management; 73
On Universality for Orthogonal Ensembles of Random Matrices
Creators: name: Shcherbina, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 15A52 (Primary); 15A57 (Secondary)

description: We prove universality of local eigenvalue statistics in the bulk of the spectrum for orthogonal invariant matrix models with real analytic potentials with one interval limiting spectrum. Our starting point is the Tracy-Widom formula for the matrix reproducing kernel. The key idea of the proof is to represent the differentiation operator matrix written in the basis of orthogonal polynomials as a product of a positive Toeplitz matrix and a two diagonal skew symmetric Toeplitz matrix.
description: 23 pages
Μελέτη σφαλμάτων λόγω αποκλίσεων γεωμετρίας σε διατάξεις μέτρησης ηλεκτρικής τομογραφίας ανάμεσα σε δύο γεωτρήσεις:
Creators: name: Γιαννάκης, Ηρακλής Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Ηλεκτρική τομογραφία
Γεωτρήσεις
Κλίση
E.R.T
Boreholes
Inclination

description: Στην παρούσα εργασία μελετάται το σφάλμα που προκύπτει στις γεωηλεκτρικές μετρήσεις Cross- Borehole από την ύπαρξη κλίσης στην μία ή και στις δύο γεωτρήσεις .Ο πρώτος τρόπος αντιμετώπισης αυτού του προβλήματος είναι η εύρεση ενός πρωτόκολλου μέτρησης το οποίο θα έχει την μικρότερη ευαισθησία στο σφάλμα κλίσης . Για να γίνει αυτό μελετήθηκαν αρκετά πρωτόκολλα ως προς το σφάλμα κλίσης και ως προς την πιστότητα με την οποία αναπαρήγαγαν τις υπεδάφιες δομές . Η αξιολόγηση αυτών των πρωτόκολλων έγινε με συνθετικά δεδομένα . Για την λήψη των συνθετικών δεδομένων δημιουργήθηκε λογισμικό το οποίο λύνει την εξίσωση Poisson για ανομοιογενή γη σε 2.5 διαστάσεις με τις πεπερασμένες διαφορές , επίσης δημιουργήθηκε λογισμικό το οποίο λύνει το ευθύ πρόβλημα για ανομοιογενή σφαίρα.
description: Ο δεύτερος τρόπος αντιμετώπισης της κλίσης είναι πιο άμεσος και έχει να κάνει με έναν έμμεσο τρόπο εύρεσης της κλίσης της γεώτρησης του οποίου τα πλεονεκτήματα έναντι των παραδοσιακών μεθόδων εύρεσης της κλίσης είναι ότι είναι ότι 1)Είναι πιο οικονομικός , 2)Είναι αμιγώς γεωφυσική μέθοδος (μπορεί να χρησιμοποιηθεί από γεωφυσικούς επιτόπου στο ύπαιθρο), 3) Σε σύγκριση με κάποιες από τις παραδοσιακές μεθόδους οι μέθοδος που προτείνεται είναι πιο ακριβής.
description: In this thesis the error of the geoelectrical cross borehole measurements due to the inclination of one or both boreholes is examined.The first way of dealing with this error is to find a protocol of measurements which will be affected as less as possible from possible inclinations. A vast variety of protocols were tested in order to find the protocol which will have enough information to reconstruct the true resistivity model and at the same time not to be practical affected from the errors due to possible inclinations. The evaluation of these protocols was conducted through synthetic data. In order to obtain synthetic data for a variety of resistivity models a software was created which solves the Poisson equation for 2.5D with finite differences. The second way of dealing with the possible inclination is more direct than the first one. An indirect method of finding the inclination of a borehole is presented. The advantages of this method compared with more traditional method of doing this are A)more economical , B)it is a pure geophysical method (which makes it easy to be used for geophysical on the field) ,C) compared to some traditional methods for measuring the boreholes tilt the method which is represented in this thesis is more accurate.
Multi-Layer Perceptrons and Symbolic Data
Creators: name: Rossi, Fabrice
name: Conan-Guez, Brieuc
Publisher: name: arXiv
Year: 2008
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: In some real world situations, linear models are not sufficient to represent accurately complex relations between input variables and output variables of a studied system. Multilayer Perceptrons are one of the most successful non-linear regression tool but they are unfortunately restricted to inputs and outputs that belong to a normed vector space. In this chapter, we propose a general recoding method that allows to use symbolic data both as inputs and outputs to Multilayer Perceptrons. The recoding is quite simple to implement and yet provides a flexible framework that allows to deal with almost all practical cases. The proposed method is illustrated on a real world data set.
Πράσινη Λογιστική και εξοικονόμηση ενέργειας στις ελληνικές επιχειρήσεις:
Creators: name: Κρανιώτη, Σοφία Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Πράσινη-Περιβαλλοντική Λογιστική
Εξοικονόμηση ενέργειας
Ελληνικές επιχειρήσεις
Green-Environmental Accounting
Energy Saving
Greek Businesses

description: Στην παρούσα διπλωματική εργασία παρουσιάζεται και αναλύεται η έννοια της Περιβαλλοντικής ή Πράσινης Λογιστικής καθώς και τα οφέλη που προκύπτουν από την εφαρμογή των πρακτικών της. Στα πλαίσια της συγκεκριμένης εργασίας, διεξήχθη μια έρευνα με την μέθοδο του ερωτηματολογίου, με σκοπό τη διαμόρφωση μιας εικόνας σχετικά με την γνώση και την εφαρμογή των πρακτικών της Περιβαλλοντικής Λογιστικής στις ελληνικές επιχειρήσεις και με τις δράσεις που λαμβάνονται για την αντιμετώπιση της περιβαλλοντικής τους επίδρασης.Η εργασία ακολουθεί την εξής δομή: Στο πρώτο κεφάλαιο παρουσιάζονται οι έννοιες της αειφόρου ανάπτυξης και της πράσινης μεγέθυνσης καθώς αποτελούν τη βάση πάνω στην οποία στηρίζεται η έννοια της Περιβαλλοντικής Λογιστικής, ενώ επίσης παρουσιάζονται οι στόχοι που επιδιώκει να πετύχει η συγκεκριμένη εργασία. Στο δεύτερο κεφάλαιο αναλύεται ο όρος της Περιβαλλοντικής Λογιστικής, τα δομικά του στοιχεία και οι λόγοι ύπαρξής του. Επιπλέον, γίνεται ανασκόπηση υπαρχουσών ερευνών για την Περιβαλλοντική Λογιστική. Στο τρίτο κεφάλαιο παρουσιάζεται η μεθοδολογία που ακολουθήθηκε για τη διεξαγωγή της συγκεκριμένης έρευνας.Στο τέταρτο κεφάλαιο παρατίθενται τα αποτελέσματα της έρευνας με μια σειρά διαγραμμάτων και συγκρίσεων με αποτελέσματα παρόμοιων ερευνών και στο πέμπτο κεφάλαιο τα συμπεράσματα που διεξήχθησαν από την έρευνα, αδυναμίες που εντοπίστηκαν καθώς και προτάσεις για περαιτέρω έρευνα.
description: This thesis presents and discusses the concept of Environmental or Green Accounting and the benefits arising from the implementation of its practices. For this purpose, was carried out a research through questionnaires, in order to record the conditions prevailing on Greek firms regarding not only the knowledge and application of Environmental Αccounting practices but also the actions taken to address their environmental impact. The thesis follows the following structure: The first chapter presents the concept of sustainable development and green growth upon which the Environmental Accounting is based. Also, this part includes the objectives of this work. The second chapter analyses the term of Environmental Accounting in its structural elements and refers the reasons for its existence. Moreover, a review of existing research on Environmental Accounting is presented. The third chapter presents a detailed explanation of the research method utilized in this study. The fourth chapter presents the results of the research and comparisons with results of similar surveys and finally the fifth chapter presents main conclusions arising from this thesis, weaknesses and proposals for further research.
Enhancing Simulated Behavior in Smoke Towards a Versatile Pedestrian Dynamics Simulation Library
Creators: name: Chraibi, Mohcine
name: Kratz, Kai
Publisher: name: Forschungzentrum Jülich
Year: 2023

description: International Association for Fire Safety Science, IAFSS23, Tsukuba, Japan, 23 Oct 2023 - 27 Oct 2023
The processes $e^+ e^-\to J/ Ψχ_{c0}, Ψ(2S) χ_{c0}$ at $\sqrt s = 10.6$GeV in the framework of light cone formalism
Creators: name: Braguta, V. V.
name: Likhoded, A. K.
name: Luchinsky, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we have analyzed the production of pair charmonium mesons in the reactions $e^+ e^- \to J/ Ψχ_{c0}, e^+ e^-\to Ψ(2S) χ_{c0}$ at energy $\sqrt s = 10.6$GeV in the framework of the light cone formalism. In comparison with NRQCD the numerical results for the cross sections are in better agreement with experiment.
description: 8 pages, 2 figures; some misprints and errors in numerical results are corrected
SDRBench: Scientific Data Reduction Benchmark for Lossy Compressors
Creators: name: Zhao, Kai
name: Di, Sheng
name: Liang, Xin
name: Li, Sihuan
name: Tao, Dingwen
name: Bessac, Julie
name: Chen, Zizhong
name: Cappello, Franck
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Efficient error-controlled lossy compressors are becoming critical to the success of today's large-scale scientific applications because of the ever-increasing volume of data produced by the applications. In the past decade, many lossless and lossy compressors have been developed with distinct design principles for different scientific datasets in largely diverse scientific domains. In order to support researchers and users assessing and comparing compressors in a fair and convenient way, we establish a standard compression assessment benchmark -- Scientific Data Reduction Benchmark (SDRBench). SDRBench contains a vast variety of real-world scientific datasets across different domains, summarizes several critical compression quality evaluation metrics, and integrates many state-of-the-art lossy and lossless compressors. We demonstrate evaluation results using SDRBench and summarize six valuable takeaways that are helpful to the in-depth understanding of lossy compressors.
description: Published in Proceedings of the 1st International Workshop on Big Data Reduction @BigData'20
title: Kritische rechtsfokussierte Analyse internationaler Carve-Out-Transaktionen
Creators: name: Neumann, Jan
name: Zerres, Thomas
Publisher: name: Hochschule Offenburg
Year: 2024

description: Im Rahmen dieser Studie sollen Struktur und der Ablauf internationaler Carve-Out-Transaktionen dargestellt werden. Der Fokus liegt hierbei auf den rechtlichen Aspekten solcher Transaktionen. Nichtsdestotrotz, da internationale Carve-Out-Transaktionen gerade eine sehr enge und komplexe Verflechtung rechtlicher, organisatorischer und strategischer Aspekte ausmacht, soll die internationale Carve-Out-Transaktion als Ganzes beleuchtet werden.
description: Arbeitspapiere für Marketing und Management; 74