cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effects of mixed rare earth occupancy on the low temperature properties of (R, R',R''...)Ni2Ge2 single crystals
Creators: name: Law, S. A.
name: Bud'ko, S. L.
name: Canfield, P. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Temperature and applied magnetic field dependent magnetization measurements on 34 single crystalline samples of (R, R',R''...)Ni2Ge2 compounds (R, R', R'', etc. being primarily Gd-Lu, Y), were made. These measurements reveal that, despite extremes in local moment anisotropy, the average de Gennes parameter is a remarkably good predictor of the paramagnetic to antiferromagnetic ordering temperature. In addition, the pronounced metamagnetic phase transitions seen in the low temperature phase of TbNi2Ge2 are found to be remarkably robust to high substitution levels of Gd and 25% substitutions of other heavy rare earths.
Worldlines and social networks
Creators: name: Jenkovszky, Laszlo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences
subject: 93A30

description: Familiar laws of physics are applied to study human relations, modelled by their world lines (worldlines, WLs) combined with social networks. We focus upon the simplest, basic element of any society: a married couple, stable due to the dynamic balance between attraction and repulsion. By building worldlines/worldsheets, we arrive at a two-level coordinate systems: one describing the behaviour of a string-like binary system (here, a married couple), the other one, external, corresponding to the motion of this couple in the medium, in which the worldline is embedded, sweeping there a string-like sheet or brane. The approach is illustrated by simple examples (semi-quantitative toy models) of worldlines/sheets, open to further extension, perfections and generalization. World lines (WLs) are combined with social networks (SN). Our innovation is in the application of basic physical laws, attraction and repulsion to human behaviour. Simple illustrative examples with empirical inputs taken from intuition and/or observation are appended. This is an initial attempt, open to unlimited applications.
description: 16 pages, 11 figures
L, Q, R, and T -- Which Spin Bit Cousin Is Here to Stay?
Creators: name: Kunze, Ike
name: Wehrle, Klaus
name: Rüth, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Network operators utilize traffic monitoring to locate and fix faults or performance bottlenecks. This often relies on intrinsic protocol semantics, e.g., sequence numbers, that many protocols share implicitly through their packet headers. The arrival of (almost) fully encrypted transport protocols, such as QUIC, significantly complicates this monitoring as header data is no longer visible to passive observers. Recognizing this challenge, QUIC offers explicit measurement semantics by exposing the spin bit to measure a flow's RTT. Ongoing efforts in the IETF IPPM working group argue to expose further information and enable the passive quantification of packet loss. This work implements and evaluates four currently proposed measurement techniques (L-, Q-, R-, and T-bit). We find that all techniques generally provide accurate loss estimations, but that longer algorithmic intervals for Q and R, yet foremost for T, complicate detecting very small loss rates or loss on short connections. Deployment combinations of Q & R as well as Q & L, thus, have the best potential for accurately grasping the loss in networks.
Unveiling Soft Gamma-Ray Repeaters with INTEGRAL
Creators: name: Gotz, D.
name: Mereghetti, S.
name: Hurley, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Thanks to INTEGRAL's long exposures of the Galactic Plane, the two brightest Soft Gamma-Ray Repeaters, SGR 1806-20 and SGR 1900+14, have been monitored and studied in detail for the first time at hard-X/soft gamma rays. This has produced a wealth of new scientific results, which we will review here. Since SGR 1806-20 was particularly active during the last two years, more than 300 short bursts have been observed with INTEGRAL. and their characteristics have been studied with unprecedented sensitivity in the 15-200 keV range. A hardness-intensity anticorrelation within the bursts has been discovered and the overall Number-Intensity distribution of the bursts has been determined. In addition, a particularly active state, during which ~100 bursts were emitted in ~10 minutes, has been observed on October 5 2004, indicating that the source activity was rapidly increasing. This eventually led to the Giant Flare of December 27th 2004, for which a possible soft gamma-ray (>80 keV) early afterglow has been detected. The deep observations allowed us to discover the persistent emission in hard X-rays (20-150 keV) from 1806-20 and 1900+14, the latter being in a quiescent state, and to directly compare the spectral characteristics of all Magnetars (two SGRs and three Anomalous X-ray Pulsars) detected with INTEGRAL.
description: 8 pages, 7 figures, Presented at the conference "Isolated Neutron Stars: from the Surface to the Interior", London, UK, 24-28 April 2006
Η διαταγή απόδοσης μισθίου ως μέσο προστασίας του εκμισθωτή, ιδίως σε σχέση με την αγωγή απόδοσης μισθίου
Creators: name: Κωνσταντίνου, Ελευθερία Ευαγγέλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Διαταγή απόδοσης μισθίου
Εκμισθωτής
Αγωγή απόδοσης μισθίου
Order for the return of the leased premises
Lessor
Lawsuit for the return of the leased premises

description: Σκοπός της διατριβής ήταν η μελέτη της προστασίας του εκμισθωτή σε περίπτωση καθυστέρησης του μισθώματος λόγω υπερημερίας του μισθωτή. Εξετάστηκαν οι προϋποθέσεις έκδοσης της διαταγής απόδοσης της χρήσης του μισθίου και στη συνέχεια παρουσιάστηκαν τα απαραίτητα στοιχεία της αίτησης σύμφωνα με τα άρθρα 639 §§1-2 και 626 §2 ΚΠολΔ. Ακόμη, αναφέρθηκε η δυνατότητα του μισθωτή να αμυνθεί κατά της διαταγής με την άσκηση ανακοπής και αίτησης αναστολής εκτέλεσης της διαταγής, καθώς και η δυνατότητα σώρευσης των ανακοπών των άρθρων 642, 632 και 933 ΚΠολΔ. Ένα άλλο θέμα που θίχθηκε ήταν η αγωγή απόδοσης του μισθίου και παρουσιάστηκαν οι δύο νομικές βάσεις των άρθρων 597 ΑΚ και 66 ΕισΝΚΠολΔ. Επιπλέον, έλαβε χώρα σύγκριση των δύο αυτών νομικών βάσεων και, τέλος, μία σύγκριση της διαταγής απόδοσης μισθίου σε σχέση με την αγωγή απόδοσης.
description: The purpose of the dissertation was to study the protection of the lessor in case of rent delay due to late payment of the lessee. The conditions for issuing the order for reimbursement of the use of the lease were examined and the necessary elements of the application were subsequently presented in accordance with Articles 639 §§1-2 and 626 §2 CCP. Τhe possibility for the lessee to defend himself against the order by bringing an opposition and an application for a stay of execution of the order was also mentioned, as well as the possibility of cumulation of the oppositions referred to in Articles 642, 632 and 933 CCP. Another issue that was raised was the lawsuit for reimbursement of the lease and the two legal bases of Articles 597 CC and 66 OFCPOL were presented. In addition, a comparison of these two legal bases took place and, finally, a comparison of the order for reimbursement in relation to the lawsuit for reimbursement.
Multimodal Emergent Fake News Detection via Meta Neural Process Networks
Creators: name: Wang, Yaqing
name: Ma, Fenglong
name: Wang, Haoyu
name: Jha, Kishlay
name: Gao, Jing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Fake news travels at unprecedented speeds, reaches global audiences and puts users and communities at great risk via social media platforms. Deep learning based models show good performance when trained on large amounts of labeled data on events of interest, whereas the performance of models tends to degrade on other events due to domain shift. Therefore, significant challenges are posed for existing detection approaches to detect fake news on emergent events, where large-scale labeled datasets are difficult to obtain. Moreover, adding the knowledge from newly emergent events requires to build a new model from scratch or continue to fine-tune the model, which can be challenging, expensive, and unrealistic for real-world settings. In order to address those challenges, we propose an end-to-end fake news detection framework named MetaFEND, which is able to learn quickly to detect fake news on emergent events with a few verified posts. Specifically, the proposed model integrates meta-learning and neural process methods together to enjoy the benefits of these approaches. In particular, a label embedding module and a hard attention mechanism are proposed to enhance the effectiveness by handling categorical information and trimming irrelevant posts. Extensive experiments are conducted on multimedia datasets collected from Twitter and Weibo. The experimental results show our proposed MetaFEND model can detect fake news on never-seen events effectively and outperform the state-of-the-art methods.
description: accepted by KDD 2021
THEaiTRE 1.0: Interactive generation of theatre play scripts
Creators: name: Rosa, Rudolf
name: Musil, Tomáš
name: Dušek, Ondřej
name: Jurko, Dominik
name: Schmidtová, Patrícia
name: Mareček, David
name: Bojar, Ondřej
name: Kocmi, Tom
name: Hrbek, Daniel
name: Košťák, David
name: Kinská, Martina
name: Nováková, Marie
name: Doležal, Josef
name: Vosecká, Klára
name: Studeník, Tomáš
name: Žabka, Petr
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: We present the first version of a system for interactive generation of theatre play scripts. The system is based on a vanilla GPT-2 model with several adjustments, targeting specific issues we encountered in practice. We also list other issues we encountered but plan to only solve in a future version of the system. The presented system was used to generate a theatre play script planned for premiere in February 2021.
description: Submitted to Text2Story workshop 2021
Accurate Modelling of Left-Handed Metamaterials Using Finite-Difference Time-Domain Method with Spatial Averaging at the Boundaries
Creators: name: Zhao, Yan
name: Belov, Pavel
name: Hao, Yang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The accuracy of finite-difference time-domain (FDTD) modelling of left-handed metamaterials (LHMs) is dramatically improved by using an averaging technique along the boundaries of LHM slabs. The material frequency dispersion of LHMs is taken into account using auxiliary differential equation (ADE) based dispersive FDTD methods. The dispersive FDTD method with averaged permittivity along the material boundaries is implemented for a two-dimensional (2-D) transverse electric (TE) case. A mismatch between analytical and numerical material parameters (e.g. permittivity and permeability) introduced by the time discretisation in FDTD is demonstrated. The expression of numerical permittivity is formulated and it is suggested to use corrected permittivity in FDTD simulations in order to model LHM slabs with their desired parameters. The influence of switching time of source on the oscillation of field intensity is analysed. It is shown that there exists an optimum value which leads to fast convergence in simulations.
description: 17 pages, 7 figures, submitted to Journal of Optics A Nanometa special issue
Blockchain-based Security Services for Fog Computing
Creators: name: Kiwelekar, Arvind W.
name: Patil, Pramod
name: Netak, Laxman D.
name: Waikar, Sanjay U
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Fog computing is a paradigm for distributed computing that enables sharing of resources such as computing, storage and network services. Unlike cloud computing, fog computing platforms primarily support {\em non-functional properties} such as location awareness, mobility and reduced latency. This emerging paradigm has many potential applications in domains such as smart grids, smart cities, and transport management. Most of these domains collect and monitor personal information through edge devices to offer personalized services. A {\em centralized} server either at the level of cloud or fog, has been found ineffective to provide a high degree of security and privacy-preserving services. Blockchain technology supports the development of {\em decentralized} applications designed around the principles of immutability, cryptography, consistency preserving consensus protocols and smart contracts. Hence blockchain technology has emerged as a preferred technology in recent times to build trustworthy distributed applications. The chapter describes the potential of blockchain technology to realize security services such as authentication, secured communication, availability, privacy and trust management to support the development of dependable fog services.
description: This is a pre-print of the following Chapter: Arvind W. Kiwelekar, Pramod Patil Laxman D. Netak and Sanjay U Waikar, {\em Blockchain-Based Security Services for Fog Computing} accepted and final version is published in Chang W., Wu J. (eds) Fog/Edge Computing For Security, Privacy, and Applications. Advances in Information Security, vol 83. Springer
Η διαδικτυακή προβολή των πράσινων πρακτικών στον τουρισμό ως εργαλείο μάρκετινγκ
Creators: name: Χατζηφωτιάδου, Χαρά Παντελή
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Πράσινος Τουρισμός
Βιωσιμότητα
Πράσινες Πρακτικές
Πράσινο Μάρκετινγκ
Ίντερνετ
Ιστοσελίδα
Green Tourism
Sustainability
Green Practices
Green Marketing
Internet
Website

description: Ο πράσινος τουρισμός αποτελεί ένα είδος βιώσιμου τουρισμού τον οποίο ενστερνίζονται ολοένα και περισσότερες επιχειρήσεις. Οι τουριστικές επιχειρήσεις που υιοθετούν τις πράσινες πρακτικές τείνουν να πιστοποιούνται και να προβάλουν την πιστοποίηση τους, αυτή στο διαδίκτυο. Σκοπός είναι η μελέτη αυτών των επιχειρήσεων και η διερεύνηση εάν η πιστοποίηση αυτή και η προβολή της αποτελούν αποτελεσματικό εργαλείο μάρκετινγκ. Η μελέτη περίπτωσης περιλαμβάνει τις πράσινες τουριστικές επιχειρήσεις της Αθήνας, ως αστική περιοχή και της Ρόδου ως παραθαλάσσια. Πραγματοποιήθηκε καταγραφή των πράσινων τουριστικών επιχειρήσεων των ανωτέρω περιοχών καθώς και διερεύνηση και αξιολόγηση των πράσινων και μη διαδικτυακών χαρακτηριστικών τους. Στη συνέχεια ακολούθησαν προσωπικές συνεντεύξεις με πράσινα και μη ξενοδοχεία πανελλαδικά για να εκτιμηθεί η αποτελεσματικότητα των πράσινων πρακτικών μέσω της προβολής τους στο διαδίκτυο, αναφορικά με την κερδοφορία της επιχείρησης και τη προσέλκυση νέων πελατών. Τέλος, την έρευνα συμπλήρωσε ένα ερωτηματολόγιο προορισμένο για το κοινό με σκοπό την αναγνώριση της σχέσης του με τον Πράσινο Τουρισμό και την διαδικτυακή προβολή των σχετικών πιστοποιήσεων. Τα ευρήματα της έρευνας είναι χρήσιμα για το σχεδιασμό της διαδικτυακής προβολής πράσινων επιχειρήσεων.
description: Green tourism is a type of sustainable tourism. More and more businesses are involved with green tourism nowadays. Accommodation providers who adopt green practices tend to obtain such green certifications which they use as part of their online marketing strategy. The goal of this research is to find these businesses and investigate whether such promotion and certification are an effective marketing tool. The case study includes Athens' green tourism business, as an urban area and Rhodes as a seaside area. The green businesses of the above areas were recorded, and an evaluation of their online presence and eco-friendly features was performed. This was followed by personal interviews with green and non-green hotels in order to understand and estimate the effectiveness of green practices through online promotion, in terms of business profitability and attracting new customers. To conclude the research, a fair amount of potential visitors was asked to complete a public survey in order to identify their knowledge about Green Tourism and its online promotion. The research findings can be used as guidelines to effectively promote green businesses online.
Bayesian inference: Weibull Poisson model for censored data using the expectation–maximization algorithm and its application to bladder cancer data
Creators: name: Pathak, Anurag
name: Kumar, Manoj
name: Singh, Sanjay Kumar
name: Singh, Umesh
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Plant Biology
subject: Computational Biology

description: This article focuses on the parameter estimation of experimental items/units from Weibull Poisson Model under progressive type-II censoring with binomial removals (PT-II CBRs). The expectation–maximization algorithm has been used for maximum likelihood estimators (MLEs). The MLEs and Bayes estimators have been obtained under symmetric and asymmetric loss functions. Performance of competitive estimators have been studied through their simulated risks. One sample Bayes prediction and expected experiment time have also been studied. Furthermore, through real bladder cancer data set, suitability of considered model and proposed methodology have been illustrated.
Πρόταση ανάδειξης του αρχαιολογικού χώρου της Κασσώπης - οι τρισδιάστατες αναπαραστάσεις ως εργαλείο ανάδειξης αρχαιολογικών χώρων
Creators: name: Τσομπόλης, Λεωνίδας Σπυρίδωνα
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Κασσώπη
Ήπειρος
Μνημείο
Kassopi
Epirus
Monument

description: Αντικείμενο της διπλωματικής εργασίας αποτελεί η ανάδειξη του αρχαιολογικού χώρου της Κασσώπης. Στόχος η δημιουργία μίας σύγχρονης πρότασης ανάδειξης του συγκεκριμένου μνημείου. Η αρχαία Κασσώπη είναι ένας από τους σημαντικότερους αρχαιολογικούς χώρους της Ηπείρου και αποτελεί παράδειγμα ύστερης κλασσικής πόλης. Βρίσκεται στον νομό Πρεβέζης, σε φυσικό οχυρό οροπέδιο στις πλαγιές του Ζαλόγγου. Η εργασία χωρίζεται σε δύο μέρη. Το πρώτο μέρος αφορά στην ανάλυση και τεκμηρίωση της αρχαίας Κασσώπης και το δεύτερο στην πρόταση ανάδειξής της. Η ιστορική έρευνα παίζει σημαντικό ρόλο στην κατανόηση του αρχαιολογικού χώρου, ενώ τροφοδοτεί την πρόταση με τα κατάλληλα συμπεράσματα και υπόβαθρα. Στο δεύτερο μέρος επιχειρείται η σύμπραξη σύγχρονων τεχνολογιών με συμβατικά εργαλεία, ώστε να επιτευχθεί η ψηφιακή αποκατάσταση της αρχαίας Κασσώπης. Στόχο αποτελεί η δημιουργία βάσης δεδομένων, η οποία μπορεί να ενημερώνεται σύμφωνα με την πρόοδο της αρχαιολογικής έρευνας. Τα τελευταία χρόνια άλλωστε παρατηρείται μία ραγδαία ανάγκη δημιουργίας ψηφιακών εργαλείων για την ανάδειξη αρχαιολογικών χώρων και μνημείων. Μέσω των ψηφιακών αναπαραστάσεων μπορούν να δημιουργηθούν ψηφιακά μοντέλα αρχαίων πόλεων, από τα οποία εξάγουμε εικόνες της καθημερινής ζωής μιας άλλης εποχής, δημιουργούμε ψηφιακές περιηγήσεις και δίνεται πρόσβαση σε ανθρώπους, οι οποίοι δεν μπορούν να βρεθούν στον φυσικό χώρο.
description: Subject of this thesis is the enhancement of the archaelogical site of Kassopi. The goal is the creation of a contemporary enhancement and promotion proposal of this particular monument. Ancient Kassopi is one of the most important archaeological sites of Epirus and a significant example of late-classical city. It is located in the prefecture of Preveza, on natural fortified plateau by the hillside of Mount Zalongo. This thesis is divided in two parts. The first part is dedicated in analysis and documentation of ancient Kassopi and the second part is dedicated in the enhancement and promotion proposal. Historical research has a major role in the understanding of the archaeological site, in the same time it fuels the proposal with appropriate conclusions and foundations. In the second part is attempted the synergy of contemporary technologies with conventional tools, in order to make possible the digital restoration of ancient Kassopi. Target is the creation of a database, which can be updated based on the archaeological research’s progress. Over recent years is noticed a rapid necessity of digital tools for the enhancement and promotion of archaeological sites and monuments. Through digital reconstructions is possible to create digital models of ancient cities, through which we can extract pictures of another era’s everyday life, we can create digital tours and give access to people, who cannot attend physical
Self-reported and actual knowledge regarding the care of individuals with diabetes mellitus of nurses working in home care and hospital settings
Creators: name: Lenahan, Rose M. M.
Publisher: name: University of British Columbia
Year: 2008

description: This descriptive correlational study was designed to describe the relationship between self-reported knowledge and skills and actual knowledge about the care of individuals with diabetes mellitus of nurses working in acute medical/surgical hospital units and home care settings. Data were gathered by means of three instruments. The Demographic Data sheet was developed by the researcher. The Diabetes Self-Report Tool (DSRT) used to measure the self-reported knowledge and skills and the Diabetes Basic Knowledge Test (DBKT) used to measure the actual knowledge were developed by Drass, Muir-Nash, Boykin, Turek & Baker (1989). The instruments were mailed to a random sample of 150 homecare and 150 acute medical/surgical hospital nurses through the computerized registry of the Registered Nurses Association of British Columbia. A total of 81 home care and 73 hospital nurses returned the completed instruments for a combined number of 154 and a response rate of 51.3%. The majority of the sample (62.7%, n = 96) had not had diabetic in-service education within the last two years or had never attended diabetic inservice. However, the home care nurses had had inservice education more recently and had more years of nursing experience than the hospital nurses. The home care and hospital nurses had DSRT mean scores of 59.9 and 56.3, respectively, out of a possible 88. The mean score for home care nurses on the DBKT was 27.95 and/or hospital nurses, 28.6, out of a possible 45. The data suggest that there were major knowledge deficits for both groups in the areas of the Somogyi effect, insulin administration, oral hypoglycemic medications, urine and blood glucose testing, the treatment of hypoglycemia and the etiology of Type I diabetes. Both groups of nurses rated their knowledge of and skills (DSRT) in caring for individuals with diabetes mellitus higher than their achieved scores on the DBKT in all 22 content areas. Scores of home care nurses on the DSRT and DBKT were positively and significantly correlated. No such relationship existed between the scores of the hospital nurses. Conclusions from the findings are presented and implications for nursing are discussed.
Exchange interaction in the yellow exciton series of cuprous oxide
Creators: name: Rommel, Patric
name: Main, Jörg
name: Farenbruch, Andreas
name: Yakovlev, Dmitri R.
name: Bayer, Manfred
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We experimentally and numerically investigate the exchange interaction of the yellow excitons in cuprous oxide. By varying the material parameters in the numerical calculations, we can interpret experimental findings and understand their origin in the complex band structure and central-cell corrections. In particular, we experimentally observe the reversal of the ortho- and paraexciton for the $2S$ yellow exciton, and explain this phenomenon by an avoided crossing with the green $1S$ orthoexciton in a detailed numerical analysis. Furthermore, we discuss the exchange splitting as a function of the principal quantum number $n$ and its deviation from the $n^{-3}$ behavior expected from a hydrogenlike model. We also explain why the observed exchange splitting of the green $1S$ exciton is more than twice the splitting of the yellow $1S$ state.
description: 9 pages, 4 figures, accepted for publication in Phys. Rev. B
Cycles in dense digraphs
Creators: name: Chudnovsky, Maria
name: Seymour, Paul
name: Sullivan, Blair D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: Let G be a digraph (without parallel edges) such that every directed cycle has length at least four; let $β(G)$ denote the size of the smallest subset X in E(G) such that $G\X$ has no directed cycles, and let $γ(G)$ be the number of unordered pairs {u,v} of vertices such that u,v are nonadjacent in G. It is easy to see that if $γ(G) = 0$ then $β(G) = 0$; what can we say about $β(G)$ if $γ(G)$ is bounded? We prove that in general $β(G)$ is at most $γ(G)$. We conjecture that in fact $β(G)$ is at most $γ(G)/2$ (this would be best possible if true), and prove this conjecture in two special cases: 1. when V(G) is the union of two cliques, 2. when the vertices of G can be arranged in a circle such that if distinct u,v,w are in clockwise order and uw is a (directed) edge, then so are both uv and vw.
Νομικά ζητήματα από τη χρήση αυτό- οδηγούμενων οχημάτων
Creators: name: Χρηστάκη, Ιωάννα Ευγενίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αυτό-οδηγούμενα οχήματα
Νομικά ζητήματα
Αστική ευθύνη
Self- driving cars
Legal issues
Liability

description: Τα αυτό- οδηγούμενα οχήματα αποτελούν το μέλλον των μετακινήσεων, καθώς προσφέρουν πλείστα πλεονεκτήματα, τόσο σε κοινωνικό όσος και σε οικονομικό επίπεδο. Ωστόσο, η ανάπτυξη και η λειτουργία τους δημιουργεί νομικά ζητήματα, κυρίως ως προς τα πρότυπα ασφάλειας, την ευθύνη από ατύχημα και την αποζημίωση των θυμάτων. Παράλληλα, η ανάπτυξη ενός καθεστώτος ευνοϊκού για την περαιτέρω ανάπτυξη της συγκεκριμένης τεχνολογίας κρίνεται αναγκαία.
description: Self- driving cars are the future of mobility, since they offer many social and economical advantages. However, legal issues, related to their safety standards, accident liability and victim remedies, arise from their use and development. Therefore, the need of creating a favourable to the further development of self- driving cars regime is highlighted.
XMM-Newton observations of the Small Magellanic Cloud: XMMU J004814.1-731003, a 25.55 s Be/X-ray binary pulsar
Creators: name: Haberl, F.
name: Eger, P.
name: Pietsch, W.
name: Corbet, R. H. D.
name: Sasaki, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: To investigate candidates for Be/X-ray binaries in the Small Magellanic Cloud (SMC), we observed a region around the emission nebula N19 with XMM-Newton in October 2006. We analysed the EPIC data of the detected point sources to derive their spectral and temporal characteristics. We detected X-ray pulsations with a period of 25.550(2) s from the second-brightest source in the field, which we designate XMMU J004814.1-731003. The X-ray spectrum is well modelled by a highly absorbed (NH = 5x10^22) powerlaw with photon index 1.33+/-0.27. The precise X-ray position allows us to identify a Be star as the optical counterpart. XMMU J004814.1-731003 is located within the error circle of the transient ASCA source AX J0048.2-7309, but its position is inconsistent with that of the proposed optical counterpart of AX J0048.2-7309 (the emission line star [MA93] 215). It remains unclear if XMMU J004814.1-731003 is associated with AX J0048.2-7309. XMMU J004814.1-731003 might be identical to an RXTE pulsar that was discovered with a period of 25.5 s, but which is listed as 51 s pulsar in the recent literature.
description: 5 pages, 6 figures, Accepted for publication in A&A
A Method to Derive the Absolute Composition of the Sun, the Solar System and the Stars
Creators: name: Piersanti, L.
name: Straniero, O.
name: Cristallo, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The knowledge of isotopic and elemental abundances of the pristine solar system material provides a fundamental test of galactic chemical evolution models, while the composition of the solar photosphere is a reference pattern to understand stellar abundances. However, spectroscopic or meteoritic abundance determinations are only possible for an incomplete sample of the 83 elements detected in the solar system. Therefore, only relative abundances are experimentally determined, with respect to H or to Si for spectroscopic or meteoritic measurements, respectively. For this reason, the available compilations of solar abundances are obtained by combining spectroscopic and meteoritic determinations, a procedure requiring the knowledge of the chemical modification occurred in the solar photosphere. We provide a method to derive the mass fractions of all the 83 elements (and their most abundant isotopes) in the early solar system material and in the present-day solar surface. Calculations are repeated by adopting the most widely adopted compilations of solar abundances. Since for a given [Fe/H], the total metallicity depends on solar (Z/X), a 30% reduction of Z is found when passing from the classical Anders&Grevesse to the most recent Lodders compilation. Some implications are discussed, as, in particular, an increase of about 700 Myr of the estimated age of Globular Clusters. Within the experimental errors, the complete set of relative solar abundances, as obtained by combining meteoritic and photospheric measurements, are consistent with the variations implied by the quoted physical processes. Few deviations can be easily attributed to the decay of long-lived radioactive isotopes. The huge lithium depletion is only partially explained by introducing a rotational-induced mixing in the tachocline.
description: 22 pages, 8 figures, accepted by A&A
Properties of the reaction front in a reaction-subdiffusion process
Creators: name: Lindenberg, Katja
name: Yuste, Santos B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the reaction front for the process $A+B\to C$ in which the reagents move subdiffusively. We propose a fractional reaction-subdiffusion equation in which both the motion and the reaction terms are affected by the subdiffusive character of the process. Scaling solutions to these equations are presented and compared with those of a direct numerical integration of the equations. We find that for reactants whose mean square displacement varies sublinearly with time as $ \sim t^γ$, the scaling behaviors of the reaction front can be recovered from those of the corresponding diffusive problem with the substitution $t\to t^γ$
description: Errata corrected, one reference updated
Additional file 2 of Attenuation of PM2.5-induced alveolar epithelial cells and lung injury through regulation of mitochondrial fission and fusion
Creators: name: Liu, Qi
name: Weng, Jiali
name: Li, Chenfei
name: Feng, Yi
name: Xie, Meiqin
name: Wang, Xiaohui
name: Chang, Qing
name: Li, Mengnan
name: Chung, Kian Fan
name: Adcock, Ian M
name: Huang, Yan
name: Zhang, Hai
name: Li, Feng
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer

description: Supplementary Material 2
Primordial non-Gaussianity from the Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey I: Catalogue Preparation and Systematic Mitigation
Creators: name: Rezaie, Mehdi
name: Ross, Ashley J.
name: Seo, Hee-Jong
name: Mueller, Eva-Maria
name: Percival, Will J.
name: Merz, Grant
name: Katebi, Reza
name: Bunescu, Razvan C.
name: Bautista, Julian
name: Brownstein, Joel R.
name: Burtin, Etienne
name: Dawson, Kyle
name: Gil-Marín, Héctor
name: Hou, Jiamin
name: Lyke, Eleanor B.
name: de la Macorra, Axel
name: Rossi, Graziano
name: Schneider, Donald P.
name: Zarrouk, Pauline
name: Zhao, Gong-Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Machine Learning (cs.LG)
subject: Computational Physics (physics.comp-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We investigate the large-scale clustering of the final spectroscopic sample of quasars from the recently completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). The sample contains $343708$ objects in the redshift range $0.8
description: 17 pages, 13 figures, 2 tables. Accepted for publication in MNRAS. For the associated code and value-added catalogs see https://github.com/mehdirezaie/sysnetdev and https://github.com/mehdirezaie/eBOSSDR16QSOE
Assessment and retrofitting of existing reinforced concrete structure using metal facades
Creators: name: Κεχαγιάς, Ευθύμιος Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Μεταλλικές προσόψεις
Μεταλλικοί σύνδεσμοι
Αποτίμηση δυναμικών χαρακτηριστικών
Metal facades
Metal links
Assessment of dynamic characteristics

description: Η τοποθέτηση εξωτερικών προσόψεων από μεταλλικά στοιχεία στα κτήρια αποτελεί μια εφαρμογή με διττή λειτουργία: Αφενός επεμβαίνει στην πρόσοψη, επιτρέποντας αρχιτεκτονικές τροποποιήσεις, αφετέρου δημιουργεί τις προϋποθέσεις για την ενεργειακή αναβάθμιση της κατασκευής, αξιοποιώντας το διάκενο που αναπτύσσεται μεταξύ παλιάς και νέα πρόσοψης. Προκειμένου να εξασφαλιστεί ότι το σύστημα ανάρτησης και αγκύρωσης μπορεί να παραλάβει με ασφάλεια, τόσο τα στατικά, όσο και τα δυναμικά φορτία, τα οποία θα καταπονήσουν την κατασκευή στη διάρκεια του κύκλου ζωής της, θα πρέπει να γίνει ένα σύνολο από ελέγχους που θα εξασφαλίζουν ακριβώς αυτό: τη στατική και αντισεισμική επάρκεια του χρησιμοποιούμενου συστήματος. Για το λόγο αυτό επιλέχθηκε ένα κτήριο με πλαισιακή λειτουργία, στην περίμετρο του οποίου τοποθετήθηκαν τοιχοποιίες και, κατόπιν, επί των τοιχοποιιών αναρτήθηκαν οι μεταλλικές προσόψεις, μέσω της χρήσης κατάλληλων συνδέσμων. Μέσω Δυναμικής Φασματικής αλλά και Ανάλυσης Χρονοϊστορίας εξετάστηκε η επάρκεια ή μη του συστήματος ανάρτησης, αλλά και οι επιπτώσεις που το σύστημα επέφερε στα ιδιομορφικά, εντασιακά και παραμορφωσιακά μεγέθη του κτηρίου. Η τελική διαπίστωση ήταν ότι η προσάρτηση αρχιτεκτονικών στοιχείων στην πρόσοψη του κτηρίου, παρότι γίνεται για αρχιτεκτονικούς ή άλλους σκοπούς, επιφέρει σημαντικές μεταβολές στην αντισεισμική απόκρισή του και, για αυτό, πρέπει να μελετάται επαρκώς.
description: The installation of exterior facades in buildings made of metal materials is a dual function application: On the one hand it intervenes on the facade, allowing architectural modifications, and on the other hand it creates the conditions to reduce energy consumption in buildings, by utilizing the gap that develops between the old and the new facade. In order to ensure that the suspension and anchoring system can safely receive both static and dynamic loads, by which the construction will be strained during its life cycle, a set of checks and controls must be performed to ensure exactly this: the static and seismic adequacy of the system used. For this reason, a building with a frame function was chosen, on the perimeter of which masonry was placed and, then, the metal facades were hung on the masonry, through the use of suitable joints. Through Dynamic Spectral Analysis and Time History Analysis, the adequacy of the suspension system was examined, as well as the effects that the system ultimately had on the modal, strain and deformation sizes of the building. The final findings were that the attachment of architectural elements to the facade of the building, although done for architectural or other purposes, brings about significant changes in its seismic response and, therefore, must be adequately studied.
Neutron lifetime measurements using gravitationally trapped ultracold neutrons
Creators: name: Serebrov, A. P.
name: Varlamov, V. E.
name: Kharitonov, A. G.
name: Fomin, A. K.
name: Pokotilovski, Yu. N.
name: Geltenbort, P.
name: Krasnoschekova, I. A.
name: Lasakov, M. S.
name: Taldaev, R. R.
name: Vassiljev, A. V.
name: Zherebtsov, O. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Our experiment using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime is reviewed. Ultracold neutrons were trapped in a material bottle covered with perfluoropolyether. The neutron lifetime was deduced from comparison of UCN losses in the traps with different surface-to-volume ratios. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In this experiment, the UCN storage time is brought closer to the neutron lifetime than in any experiments before:the probability of UCN losses from the trap was only 1% of that for neutron beta decay. The neutron lifetime obtained,878.5+/-0.7stat+/-0.3sys s, is the most accurate experimental measurement to date.
description: 38 pages, 19 figures,changed content
Additional file 1 of DNMT3A mutation promotes leukemia development through NAM-NAD metabolic reprogramming
Creators: name: Yang, Xuejiao
name: Wang, Xiao
name: Yang, Ying
name: Li, Zhiyang
name: Chen, Yunshuo
name: Shang, Siqi
name: Wang, Yueying
Publisher: name: figshare
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Table S1. Primer sequences used in Q-RT-PCR.
Deviations From Axisymmetry Revealed by Line Polarization in the Normal Type Ia SN 2004S
Creators: name: Chornock, Ryan
name: Filippenko, Alexei V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a single epoch of high signal-to-noise ratio spectropolarimetry of the Type Ia supernova (SN Ia) 2004S taken nine days after maximum light. The flux spectrum is normal, but with the additional presence of high-velocity (HV) line features in both Ca II and Fe II. The object shows continuum polarization at the 0.4% level in the red, a value which appears to be typical of SNe Ia. The continuum data are consistent with a ~10% global asphericity in an axisymmetric geometry. Unlike previous observations of other SNe Ia with HV features, the HV features in SN 2004S show no strong polarimetric signature, though this may be due to the timing of our observations. Instead, the object shows line polarization features (P < 0.5%) that are rotated with respect to the axis of symmetry of the continuum. The line features are visible in Si II, Fe II, and Ca II, and appear to be narrowly confined in velocity space just above the photosphere. These polarization features are a result of compositional inhomogeneities in the ejecta. They may represent newly synthesized elements whose clumpy spatial distribution within the ejecta is distinct from that of the globally aspherical ejecta as a whole.
description: 25 pages, 6 figures, AJ, minor revisions to match accepted journal version
A near analytic solution of a stochastic immune response model considering variability in virus and T cell dynamics
Creators: name: Batra, Abhilasha
name: Sharma, Rati
Publisher: name: arXiv
Year: 2021
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Biological processes at the cellular level are stochastic in nature, and the immune response system is no different. Therefore, models that attempt to explain this system need to also incorporate noise or fluctuations that can account for the observed variability. In this work, a stochastic model of the immune response system is presented in terms of the dynamics of the T cells and the virus particles. Making use of the Green's function and the Wilemski-Fixman approximation, this model is then solved to obtain the analytical expression for the joint probability density function of these variables in the early and late stages of infection. This is then also used to calculate the average level of virus particles in the system. Upon comparing the theoretically predicted average virus levels to those of COVID-19 patients, it is hypothesized that the long lived dynamics that are characteristic of such viral infections are due to the long range correlations in the temporal fluctuations of the virions. This model therefore provides an insight into the effects of noise on viral dynamics.
Linking ghost penalty and aggregated unfitted methods
Creators: name: Badia, Santiago
name: Neiva, Eric
name: Verdugo, Francesc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: In this work, we analyse the links between ghost penalty stabilisation and aggregation-based discrete extension operators for the numerical approximation of elliptic partial differential equations on unfitted meshes. We explore the behavior of ghost penalty methods in the limit as the penalty parameter goes to infinity, which returns a strong version of these methods. We observe that these methods suffer locking in that limit. On the contrary, aggregated finite element spaces are locking-free because they can be expressed as an extension operator from well-posed to ill-posed degrees of freedom. Next, we propose novel ghost penalty methods that penalise the distance between the solution and its aggregation-based discrete extension. These methods are locking-free and converge to aggregated finite element methods in the infinite penalty parameter limit. We include an exhaustive set of numerical experiments in which we compare weak (ghost penalty) and strong (aggregated finite elements) schemes in terms of error quantities, condition numbers and sensitivity with respect to penalty coefficients on different geometries, intersection locations and mesh topologies.
Towards an understanding of the Of?p star HD191612: Phase-resolved multiwavelength observations
Creators: name: Naze, Yael
name: Rauw, Gregor
name: Pollock, A. M. T.
name: Walborn, Nolan R.
name: Howarth, Ian D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the analysis of phase-resolved X-ray and optical observations of the peculiar hot star HD191612 (Of?p). This star is known to display line-profile variations that are recurrent with a period of 538d and its spectrum was found to present the signature of a magnetic field. In the X-rays, it is slightly overluminous compared to the canonical L_X/L_BOL relation and appears brighter when the optical lines are strongest. Our XMM-Newton observations further reveal that the X-ray spectrum of \hd exhibits rather broad lines and is dominated by a `cool' (0.2-0.6 keV) thermal component, two characteristics at odds with the proposed magnetic rotator model. We also report for the first time the low-level variability of the metallic (abs/em) lines and HeII absorptions that appear to be associated with radial-velocity shifts. Finally, we compare our results with observations of the early-type stars and discuss several possible scenarios.
description: 10p, 10 fig, accepted for publication in MNRAS (www.blackwell-synergy.com)
Dietary cholesterol in graded amounts : threshold to ceiling effects upon plasma free cholesterol synthesis, equilibration and circulation levels in humans
Creators: name: Li, Zi-Chi
Publisher: name: University of British Columbia
Year: 2008

description: The purpose of this study was to investigate the effect of dietary cholesterol upon plasma cholesterol concentration and cholesterogenesis; and the aspect of equilibration of newly synthesized cholesterol between plasma and red blood cell (RBC) in humans. Eight healthy subjects (seven men and one woman) at the age of 55.5 ± 4.2 (mean ± SEM) years were recruited for this study. Three experimental diets (55% carbohydrate, 15%protein, 30% fat, P:S = 0.8) containing 50mg (low), 350mg (medium) and 650mg (high) cholesterol per day were randomly consumed by these subjects for four weeks at levels designed to maintain body weight. On day 28 of each diet, subjects were given a priming dose of 0.7 g deuterium oxide(D20)/kg body water followed by maintenance doses over 24 hours. Cholesterol synthesis was determined as the fractional synthetic rate (FSR)of the rapid exchangeable pool calculated by deuterium incorporation from body water into plasma free cholesterol over 24 hours. RBC cholesterol deuterium incorporation was also compared to that of plasma free cholesterol. Plasma cholesterol was significantly elevated by 13% (+26mg/di, P = 0.002) in the high as compared to low but not medium cholesterol containing diets. Equilibration of deuterium enrichment from the newly synthesized plasma free cholesterol, expressed as parts per thousand (0/00) relative to Standard Mean Ocean Water (SMOW), to RBC cholesterol was significantly delayed over the initial 6 (51.7 ± 15.5 vs 1.8 ± 10.2/a, oof P = 0.010) and 12 (60.0 ± 12.3 vs 16.1 ± 8.0^oof P = 0.005) hours post dose in the high cholesterol diet. Dietary cholesterol levels of 50, 350, and 650 mg/day did not alter FSR (0.078 ± 0.016, 0.072 ± 0.007 and 0.071 ±0.014 day-1, respectively, P = 0.913). No relationship between change of plasma cholesterol and rate of cholesterogenesis was observed among the three experimental diets. These findings suggest that dietary cholesterol levels affect plasma cholesterol concentrations. Deuterium incorporation between plasma free cholesterol and RBC cholesterol is delayed over the initial 12 hours post dose. Use of a deuterium incorporation period of 24 hours, or more, enables more accurate determination of cholesterogenesis when using this methodology. Cholesterogenesis is neither affected by dietary cholesterol nor correlated with alterations of plasma cholesterol concentration.