cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Renormalization in Combinatorially Non-Local Field Theories: the BPHZ Momentum Scheme
Creators: name: Thürigen, Johannes
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Various combinatorially non-local field theories are known to be renormalizable. Still, explicit calculations of amplitudes are very rare and restricted to matrix field theory. In this contribution I want to demonstrate how the BPHZ momentum scheme in terms of the Connes-Kreimer Hopf algebra applies to any combinatorially non-local field theory which is renormalizable. This algebraic method improves the understanding of known results in noncommutative field theory in its matrix formulation. Furthermore, I use it to provide new explicit perturbative calculations of amplitudes in tensorial field theories of rank $r>2$.
Academic Profile, Network and Collaboration Analysis : Use Cases for the University
Creators: name: Wastl, Juergen
Publisher: name: Apollo - University of Cambridge Repository
Year: 2017
Subjects: Academic Profiling
Network Analysis
Research Information System

description: Recent years saw the emergence of research information systems (RIS) in University IT portfolios. The increasing number of local RIS show the need for the institutions to provide tools for its academic and administrative staff as well as for senior management for making strategic decision or complying with reporting requirements. This seminar lecture focuses on trends and challenges in managing implementations of RIS from an institutional view: Data curation and data quality issues form the basis of the quest for a fit-for-purpose, efficient and sustainable RIS. Examples based around interconnectivity will exploit the application of data standards to increase efficiency and sustainability in research information matters. Previously used for retrospective mandatory reporting requirements (e.g. peer review evaluation in REF, funder post-award reports), RIS expand to more than that: Academic Profiles, network and collaboration analysis form part of latest developments to futureproof the University RIS to become a pro-active tool used by academics in their day-to-day business.
Soliton Solutions for the Super mKdV and sinh-Gordon Hierarchy
Creators: name: Gomes, J. F.
name: Ymai, L. H.
name: Zimerman, A. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The dressing and vertex operator formalism is emploied to study the soliton solutions of the N=1 super mKdV and sinh-Gordon models. Explicit two and four vertex solutions are constructed. The relation between the soliton solutions of both models is verified.
description: To appear in Phys. Lett. A
A test of the variability of practice hypothes: the acquisition of a gross motor skill
Creators: name: Spriddle, Dean
Publisher: name: University of British Columbia
Year: 2008

description: The sport of golf presents the constant challenge of a novel movement problem with every succeeding shot. A novel movement, in this instance, being a new and different movement experience (Schmidt, 1975). The purpose of this study was to test the Variability of Practice Hypothesis (Schmidt, 1975) in a gross motor skill learning situation. More specifically, to assess the effectiveness of varying the initial conditions of a practice method, which was designed to facilitate the transfer of an expanded range of skills to the actual playing situation. 32 adult male and female golfers, who possessed a handicap between 12 and 24 strokes were assigned to one of two experimental groups according to their scores on a pre-practice administration of a criterion golf accuracy performance test. The experimental group undertook a variable practice schedule incorporating a stance simulator which presented a differing lie and elevation on each stroke, whereas, the control group was presented with a constant practice schedule which had every ball played from the same location and lie. The criterion test was administered four times in total, throughout the course of the six week experiment and required each subject to play three 120 yard approach shots from each of six different fairway locations and lies, to a slightly uphill target area (flag stick). The radial error values of each subject were analyzed by a 2 (groups) X 4 (tests) X 6 (positions) ANOVA with repeated measures on the 2nd and 3rd factors. A Chi square test was conducted from scatter plot graphs of each subject's shots, to determine shot pattern similarities. The comments from each subject's self analysis checklist reports were recorded and classified to detect any cognitive activity that reflected action plan recostruction The variable practice group's performance showed a significant improvement in golf shot accuracy, from each ofthe 6 test locations, in comparison to that of the constant practice group. When the test positions were categorized, in terms of severity of lie, an interaction effect was observed revealing that the variable practice group improved performance on the less severe lies as well as the severe lies, whereas the constant practice group had no significant improvement in performance. The Variability of Practice Hypothesis was tested whilst manipulating the initial conditions of practice. Variable practice in this practical field study found definite support for Schmidt's Hypothesis. From a practical point of view the results from this study illustrate the benefits of variable practice in a practice schedule adding strength to the position that the Variability of Practice Hypothesis should be considered as a important guideline to the structure of practice experiences.
Predictive and explanatory models might miss informative features in educational data
Creators: name: Young, Nicholas T.
name: Caballero, Marcos D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Physics Education (physics.ed-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We encounter variables with little variation often in educational data mining (EDM) due to the demographics of higher education and the questions we ask. Yet, little work has examined how to analyze such data. Therefore, we conducted a simulation study using logistic regression, penalized regression, and random forest. We systematically varied the fraction of positive outcomes, feature imbalances, and odds ratios. We find the algorithms treat features with the same odds ratios differently based on the features' imbalance and the outcome imbalance. While none of the algorithms fully solved how to handle imbalanced data, penalized approaches such as Firth and Log-F reduced the difference between the built-in odds ratio and value determined by the algorithm. Our results suggest that EDM studies might contain false negatives when determining which variables are related to an outcome. We then apply our findings to a graduate admissions data set. We end by proposing recommendations that researchers should consider penalized regression for data sets on the order of hundreds of cases and should include more context about their data in publications such as the outcome and feature imbalances.
description: 46 pages, 15 figures, 7 tables
Αναδρομική Μελέτη 12 Περιστατικών Προηβικής Ουρηθροστομίας στον σκύλο
Creators: name: Χιώτη, Ελευθερία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Δυσουρία
Ουρηθροστομία
Σκύλος
Dysuria
Urethrostomy
Dog

description: Δώδεκα σκύλοι, 11 αρσενικοί και 1 θηλυκός, μέσης ηλικίας 5,3 ετών διαφόρων φυλών υποβλήθηκαν σε προηβική ουρηθροστομία με σκοπό την αντιμετώπιση τραυμάτων, στενώσεων και έμφραξης της ουρήθρας από λίθους. Η κλινική εικόνα των ζώων περιλάμβανε κυρίως συμπτώματα, στραγγουρίας σε ποσοστό 50% και ανουρίας 33,3%. Η διαγνωστική διερεύνηση περιλάμβανε την απλή ακτινογραφία κοιλίας και την παλίνδρομη ουρηθρογραφία. Το στόμιο της ουρηθροστομίας κατέληξε παράπλευρα της ακροποσθίας σε 11 ζώα και στη μέση γραμμή σε 1 ζώο. Οι άμεσες μετεγχειρητικές επιπλοκές περιλάμβαναν κατά κύριο λόγο, την εμφάνιση αιματουρίας και ακράτειας ούρων. Από τους σκύλους που συμμετείχαν στη μελέτη το 41,66% απεβίωσε σε διάστημα 3 ημερών μέχρι και ενός μήνα μετά την επέμβαση. Μετά από μέση μετεγχειρητική παρακολούθηση 2,41 ετών και επικοινωνία με τους ιδιοκτήτες, το 16,7% των σκύλων συνεχίζει να παρουσιάζει μόνιμη ακράτεια
description: Αγγλική Περίληψη Twelve dogs, 11 male and one female of mean age of 5.3 years belonging to different breeds underwent prepubic urethrostomy for the management of urethral injuries or urethral obstruction related to urinary calculi. The clinical signs at presentation included stranguria (50%) or anuria (33,3%). The diagnosis was made by abdominal radiography or retrograde urethrography. Prepubic urethrostomy was placed lateral to the prepuce in 11 dogs or in the ventral midline in one. Postoperative complications included haematuria and urinary incontinence. Five of the dogs died within three to 30 days after surgery. Overall, of the 12 dogs seven survived after a mean follow up time of 2.41 years. Of these dogs 16,7% showed permanent urinary incontinence
The Hierarchy Principle and the Large Mass Limit of the Linear Sigma Model
Creators: name: Bettinelli, Daniele
name: Ferrari, Ruggero
name: Quadri, Andrea
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In perturbation theory we study the matching in four dimensions between the linear sigma model in the large mass limit and the renormalized nonlinear sigma model in the recently proposed flat connection formalism. We consider both the chiral limit and the strong coupling limit of the linear sigma model. Our formalism extends to Green functions with an arbitrary number of pion legs,at one loop level,on the basis of the hierarchy as an efficient unifying principle that governs both limits. While the chiral limit is straightforward, the matching in the strong coupling limit requires careful use of the normalization conditions of the linear theory, in order to exploit the functional equation and the complete set of local solutions of its linearized form.
description: Latex, 41 pages, corrected typos, final version accepted by IJTP
Identifying businesses and entrepreneurs from the Censuses, 1891-1911
Creators: name: Smith, Harry
name: Bennett, Robert
name: Van Lieshout, Carry
Publisher: name: Apollo - University of Cambridge Repository
Year: 2017
Subjects: Entrepreneurship
Employers
Self-employment
Small businesses
Census

description: This paper explains how employers and own account self-employed individuals can be extracted from the original manuscript records of household returns to the population census for 1891-1911. The paper describes the how entrepreneurs are identified in each census, the issues that arise, how miscoding in I-CeM have been corrected, and the method by which each census was cleaned and prepared for subsequent analysis. Detailed discussion covers the quality of returns of employer and own account business proprietor status, how far individuals had two or more statuses identified, the extent of biases in non- response to the employment status census question, and geographical patterns of non-response. The use of occupation descriptors to clean the coding of employers and own account proprietors is outlined as steps towards database construction.
FedDR -- Randomized Douglas-Rachford Splitting Algorithms for Nonconvex Federated Composite Optimization
Creators: name: Tran-Dinh, Quoc
name: Pham, Nhan H.
name: Phan, Dzung T.
name: Nguyen, Lam M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We develop two new algorithms, called, FedDR and asyncFedDR, for solving a fundamental nonconvex composite optimization problem in federated learning. Our algorithms rely on a novel combination between a nonconvex Douglas-Rachford splitting method, randomized block-coordinate strategies, and asynchronous implementation. They can also handle convex regularizers. Unlike recent methods in the literature, e.g., FedSplit and FedPD, our algorithms update only a subset of users at each communication round, and possibly in an asynchronous manner, making them more practical. These new algorithms can handle statistical and system heterogeneity, which are the two main challenges in federated learning, while achieving the best known communication complexity. In fact, our new algorithms match the communication complexity lower bound up to a constant factor under standard assumptions. Our numerical experiments illustrate the advantages of our methods over existing algorithms on synthetic and real datasets.
description: 39 pages, and 12 figures
Απόψεις γονέων μεταναστών για την ένταξη των παιδιών τους στο ελληνικό εκπαιδευτικό σύστημα
Creators: name: Μησιάκα, Μαρία-Νίνα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: εκπαίδευση
μετανάστες
ένταξη
education
immigrants
inclusion

description: Η εργασία μας στηρίζεται σε έρευνα σχετικά με απόψεις εκπαιδευτικών και μητέρων παιδιών μεταναστών και προσφύγων του «Αριστοτελείου» Δημοτικού Σχολείου Αττικής κατά το σχολικό έτος 2018-2019. Σχετικά με τη συμμετοχή των παραπάνω γονέων στην εκπαίδευση των παιδιών τους, η έρευνά μας έδειξε ότι ήταν αρκετά προβληματική λόγω δύο βασικών αιτιών: η ανεπάρκεια της ελληνικής γλώσσας και το βεβαρυμμένο πρόγραμμα. Το προσωπικό του σχολείου θα πρέπει να ενθαρρύνει τη συμμετοχή των γονέων των παιδιών μεταναστών και προσφύγων στην εκπαίδευση μέσω της επικοινωνίας και της δόμησης ενός φιλικού σχολικού περιβάλλοντος. Αρκετά άτομα του σχολικού προσωπικού δεν γνωρίζουν αγγλικά και ορισμένες μητέρες αντιμετωπίζουν δυσκολίες τόσο στην επικοινωνία με τους/τις εκπαιδευτικούς όσο και στο να βοηθήσουν τα παιδιά τους στο καθημερινό διάβασμα. Για την αντιμετώπιση των προβλημάτων αυτών το σχολείο θα μπορούσε να ενσωματώσει στο κανονικό του πρόγραμμα τη δίγλωσση διδασκαλία, να προσφέρει μαθήματα της ελληνικής γλώσσας στους γονείς των παιδιών μεταναστών και προσφύγων, να προσλάβει εκπαιδευμένο προσωπικό και να επιμορφώσει το υφιστάμενο σχολικό προσωπικό για τη βελτίωση των επικοινωνιακών και των γλωσσικών τους ικανοτήτων
description: Our study based on a survey towards educators and female parents of immigrants and refugees pupils who studied in the «Aristotle» Primary School of Athens, during the school term. As for the participation of the parents above in their children's education, our study has proven that was quite problematic due to two main causes: the lack of fluency in greek language and the busy schedule. School personnel may encourage the parental participation of immigrants and refugees parents. For immigrants and refugees parents the concept of communication has to be a matter of first priority in order to create a welcoming school environment. Many of the school personnel do not speak even the english language and some female parents have difficulty in communicating with educators and helping their children with homework. Dealing with those problems school could incorporate into the normal programs bilingual materials, offer programs of greek language classes to foreign parents, hire well-educated staff whereas the current school personnel shall be continuously educated to obtain better communicating and linguistic skills
A relativistic partially electromagnetic planar plasma shock
Creators: name: Dieckmann, M. E.
name: Shukla, P. K.
name: Drury, L. O. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We model relativistically colliding plasma by PIC simulations in one and two spatial dimensions, taking an ion-to-electron mass ratio of 400. Energy dissipation by a wave precursor of mixed polarity and different densities of the colliding plasma slabs results in a relativistic forward shock forming on millisecond timescales. The forward shock accelerates electrons to ultrarelativistic energies and reflects upstream ions, which drag the electrons along to preserve the plasma quasi-neutrality. No reverse shock forms. The shock may be representative for internal gamma ray burst shocks.
Measurement of Branching Fractions and CP-Violating Charge Asymmetries for B Meson Decays to D(*)D(*), and Implications for the CKM Angle gamma
Creators: name: The BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present measurements of the branching fractions and charge asymmetries of B decays to all D(*)D(*) modes. Using 232 million BBbar pairs recorded on the Upsilon(4S) resonance by the BaBar detector at the e+e- asymmetric B factory PEP-II at the Stanford Linear Accelerator Center, we measure the branching fractions BF(B0 -> D*+D*-) = (8.1 +- 0.6 +- 1.0) x 10^-4, BF(B0 -> D*+-D-+) = (5.7 +- 0.7 +- 0.7) x 10^-4, BF(B0 -> D+D-) = (2.8 +- 0.4 +- 0.5) x 10^-4, BF(B+ -> D*+D*0) = (8.1 +- 1.2 +- 1.2) x 10^-4, BF(B+ -> D*+D0) = (3.6 +- 0.5 +- 0.4) x 10^-4, BF(B+ -> D+D*0) = (6.3 +- 1.4 +- 1.0) x 10^-4, and BF(B+ -> D+D0) = (3.8 +- 0.6 +- 0.5) x 10^-4, where in each case the first uncertainty is statistical and the second systematic. We also determine the limits BF(B0 -> D*0D*0) < 0.9 x 10^-4, BF(B0 -> D*0D0) < 2.9 x 10^-4, and BF(B0 -> D0D0) < 0.6 x 10^-4, each at 90% confidence level. All decays above denote either member of a charge conjugate pair. We also determine the CP-violating charge asymmetries A(B0 -> D*+-D-+) = 0.03 +- 0.10 +- 0.02, A(B+ -> D*+D*0) = -0.15 +- 0.11 +- 0.02, A(B+ -> D*+D0) = -0.06 +- 0.13 +- 0.02, A(B+ -> D*+D*0) = 0.13 +- 0.18 +- 0.04, and A(B+ -> D+D0) = -0.13 +- 0.14 +- 0.02. Additionally, when we combine these results with information from time-dependent CP asymmetries in B0 -> D*+D*- decays and world-averaged branching fractions of B decays to Ds(*)D(*) modes, we find the CKM phase gamma is favored to lie in the range [0.07-2.77] radians (with a +0 or +pi radians ambiguity) at 68% confidence level.
description: 23 pages, 6 postscript figues, submitted to Phys. Rev. D
New antibiofilm strategies for the management of nontuberculous mycobacteria diseases
Creators: name: Cano-Fernández, María
name: Esteban, Jaime
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Medicine
subject: Pharmacology
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: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences

description: Nontuberculous mycobacteria (NTM) represent a group of microorganisms comprising more than 190 species. NTM infections have increased recently, and their treatment is a major challenge because to their resistance to conventional treatments. This review focuses on innovative strategies aimed at eradicating NTM biofilms, a critical factor in their resistance. Important areas addressed include biofilm formation mechanisms, current therapeutic challenges, and novel treatment approaches. The main objective is to compile and analyze information on these emerging strategies, identifying pivotal research directions and recent advancements. A review of the scientific literature was conducted to identify emerging novel therapies for the treatment of NTM infections and to explore potential synergies with existing treatments. Experts highlights a limited understanding of optimal treatment regimens, often supported by insufficient scientific evidence. Current therapies are typically prolonged, involve multiple antibiotics with adverse effects, and frequently do not achieve patient cure. Certain species are even considered virtually impossible to eradicate. A thorough understanding of these new approaches is imperative for improving patients outcomes. This review provides a robust foundation for developing of more effective antibacterial strategies, which are essential because of the increasing incidence of NTM infections and the limitations of existing therapies.
Monocular Multi-Layer Layout Estimation for Warehouse Racks
Creators: name: Nigam, Meher Shashwat
name: Prabhu, Avinash
name: Sahu, Anurag
name: Gupta, Puru
name: Karandikar, Tanvi
name: Shankar, N. Sai
name: Sarvadevabhatla, Ravi Kiran
name: Krishna, K. Madhava
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Given a monocular colour image of a warehouse rack, we aim to predict the bird's-eye view layout for each shelf in the rack, which we term as multi-layer layout prediction. To this end, we present RackLay, a deep neural network for real-time shelf layout estimation from a single image. Unlike previous layout estimation methods, which provide a single layout for the dominant ground plane alone, RackLay estimates the top-view and front-view layout for each shelf in the considered rack populated with objects. RackLay's architecture and its variants are versatile and estimate accurate layouts for diverse scenes characterized by varying number of visible shelves in an image, large range in shelf occupancy factor and varied background clutter. Given the extreme paucity of datasets in this space and the difficulty involved in acquiring real data from warehouses, we additionally release a flexible synthetic dataset generation pipeline WareSynth which allows users to control the generation process and tailor the dataset according to contingent application. The ablations across architectural variants and comparison with strong prior baselines vindicate the efficacy of RackLay as an apt architecture for the novel problem of multi-layered layout estimation. We also show that fusing the top-view and front-view enables 3D reasoning applications such as metric free space estimation for the considered rack.
description: Visit our project repository at https://github.com/Avinash2468/RackLay
Εξαρτήσεις στην Εφηβεία
Creators: name: Αγγελόπουλος, Αθανάσιος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Εξαρτήσεις
Εφηβεία
Dependencies
Puberty

description: Η εργασία αυτή πραγματεύεται τις εξαρτήσεις στις οποίες έρχονται σε επαφή οι έφηβοι μέχρι την ηλικία των 16 ετών, τις αιτίες που τους οδηγούν στο να καταφεύγουν στη συγκεκριμένη οδό ως διέξοδο από τα πιθανά προβλήματα τους και προτείνονται τρόποι πρόληψης κατά αυτών των εξαρτήσεων. Γίνεται μια σύντομη αναφορά στις φάσεις της εφηβείας που είναι και οι πιο κρίσιμες αυτής της περιόδου. Έπειτα, παρουσιάζονται οι εξαρτήσεις που σχετίζονται με την εφηβεία και τα αναλυτικά τα αποτελέσματα μιας έρευνας που πραγματοποιήθηκε το 2015 πανελλαδικά και δείχνει ποια είναι η χρήση ή επαφή με τις εξαρτήσεις από τους εφήβους ποσοτικά. Παράλληλα γίνεται μια αναφορά σε λόγους που οι έφηβοι καταφεύγουν στις εξαρτήσεις ως μέσο έκφρασης ή διεξόδου από την καθημερινότητά τους και τέλος παρουσιάζονται τρόποι πρόληψης κατά των εξαρτήσεων ή αποφυγής οποιασδήποτε επαφής μαζί τους
description: This work addresses the addictions that adolescents come into contact with until the age of 16, the causes that lead them to resort to this route as a way out of their potential problems, and suggests ways to prevent these addictions. A brief reference is made to the stages of adolescence that are the most critical of this period. Next, the adolescent-related dependencies and the results of a nationwide survey of 2015 are presented and show what the use or contact of adolescents depend on quantitatively. At the same time, there is a reference to the reasons why adolescents resort to addictions as a means of expression or escape from their daily lives, and finally ways to prevent addiction or avoid contact with them are presented
description: Σε συνεργασία με το Τμήμα Ιατρικής της Σχολής Επιστημών Υγείας του Δημοκρίτειου Πανεπιστημίου Θράκης (ΔΠΘ), το Τμήμα Πολιτικών Μηχανικών ΤΕ της Σχολής Τεχνολογικών Εφαρμογών του Αλεξάνδρειου ΤΕΙ Θεσσαλονίκης (ΑΤΕΙΘ)
Trajectory Length and Autocorrelation Times -- Nf=2 simulations in the Schroedinger functional
Creators: name: Meyer, Harvey B.
name: Witzel, Oliver
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: A status report is presented on the large-volume simulations in the Schroedinger functional with two flavours of O(a) improved Wilson quarks performed by the ALPHA collaboration. The physics goal is to set the scale for the computation of the fundamental parameters of QCD. In this talk the emphasis is on aspects of the Hybrid Monte-Carlo algorithm, which we use with (symmetric) even-odd and Hasenbusch preconditioning. We study the dependence of aucorrelation times on the trajectory length. The latter is found to be significant for fermionic correlators, the trajectories longer than unity performing better than the shorter ones.
description: 7 pages, 4 figures: LATTICE 06 (Tucson,AZ) proceedings
Metallicity as a criterion to select H2 bearing Damped Lyman-alpha systems
Creators: name: Petitjean, Patrick
name: Ledoux, C.
name: Noterdaeme, P.
name: Srianand, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We characterize the importance of metallicity on the presence of molecular hydrogen in damped Lyman-alpha (DLA) systems. We construct a representative sample of 18 DLA/sub-DLA systems with log N(HI)>19.5 at high redshift (zabs>1.8) with metallicities relative to solar [X/H]>-1.3(with[X/H]= logN(X)/N(H)-log(X/H)solar and X either Zn, S or Si). We gather data covering the expected wavelength range of redshifted H2 absorption lines on all systems in the sample from either the literature (10 DLAs), the UVES-archive or new VLT-UVES observations for four of them. The sample is large enough to discuss for the first time the importance of metallicity as a criterion for the presence of molecular hydrogen in the neutral phase at high-z. From the new observations, we report two new detections of molecular hydrogen in the systems at zabs=2.431 toward Q2343+125 and zabs=2.426 toward Q2348-011. We compare the H2 detection fraction in the high-metallicity sample with the detection fraction in the overall sample from Ledoux et al. (2003). We show that the fraction of DLA systems with logf=log 2N(H2)/(2N(H2)+N(HI))>-4 is as large as 50% for [X/H]>-0.7 when it is only about 5% for [X/H]
description: 4 pages, 3 Postscript figures. Accepted in Astronomy and Astrophysics Letter
Rough translation of file 021_A (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-301113-07: Rough translation (minute-by-minute) of file 021_A (tape 021, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 20:12 to the end of the file; no transcription in this session, translation only. Due to re-numbering, tape 021_A has been assigned to the CLA item number LA256.021, audio file LA256.021A.
Evolution of Primordial Neutrino Helicities in Cosmic Gravitational Inhomogeneities
Creators: name: Baym, Gordon
name: Peng, Jen-Chieh
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Relic neutrinos from the Big Bang decoupled from the hot plasma predominantly in helicity eigenstates. Their subsequent propagation through gravitational inhomogeneities of the Universe alters the helicities of both Dirac and Majorana neutrinos, thus providing an independent probe of the evolving universe. We determine here the probability that relic neutrinos flip their helicity, in terms of the spectrum of density inhomogeneities measured in the Cosmic Microwave Background. As we find, for Dirac neutrinos the gravitational helicity modifications are intermediate between the effects of magnetic fields if the neutrino magnetic moment is of the magnitude predicted in the Standard Model and the much larger effects if the magnetic moment is of the scale consistent with the excess of low energy electron events seen by the XENON1T experiment. We give succinct derivations, within general relativity, of the semi-classical response of a spinning particle to a weak gravitational field in an expanding universe, and estimate the helicity modifications of neutrinos emitted by the Sun caused by the Sun's gravity.
description: Typographical error corrected in Appendix A
Submanifolds with the Harmonic Gauss Map in Lie Groups
Creators: name: Petrov, Eugene V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C42, 53C43

description: In this paper we find a criterion for the Gauss map of an immersed smooth submanifold in some Lie group with left invariant metric to be harmonic. Using the obtained expression we prove some necessary and sufficient conditions for the harmonicity of this map in the case of totally geodesic submanifolds in Lie groups admitting biinvariant metrics. We show that, depending on the structure of the tangent space of a submanifold, the Gauss map can be harmonic in all biinvariant metrics or non-harmonic in some metric. For 2-step nilpotent groups we prove that the Gauss map of a geodesic is harmonic if and only if it is constant.
description: To appear in Journal of Mathematical Physics, Analysis, Geometry
Quantum disordering of the 111 state and the compressible-incompressible transition in quantum Hall bilayer systems
Creators: name: Papic, Zlatko
name: Milovanovic, Milica V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We systematically discuss properties of quantum disordered states of the quantum Hall bilayer at ν_T = 1. For one of them, so-called vortex metal state, we find ODLRO (off-diagonal long-range order) of algebraic kind, and derive its transport properties. It is shown that this state is relevant for the explanation of the "imperfect" superfluid behavior, and persistent intercorrelations, for large distances between layers, that were found in experiments.
description: 9 pages, 4 figures
Minimum Jerk Trajectory Generation for Straight and Curved Movements: Mathematical Analysis
Creators: name: Sharkawy, Abdel-Nasser
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: In this chapter, the mathematical analysis of the minimum jerk trajectory (MJT) generation is performed. In this study, the position and the velocity of the minimum jerk trajectory as a function of time is presented in two cases: the first one is the unconstrained point-to-point movements of the human hand, whereas the second case is the curved point-to-point movements of the human hand. Simulation study is carried out with some examples and MATLAB is used for this simulation. The results prove that the minimum jerk trajectory is the smoothest possible movement of the human hand.
description: 15 Pages, 10 Figures
Scale space consistency of piecewise constant least squares estimators -- another look at the regressogram
Creators: name: Boysen, Leif
name: Liebscher, Volkmar
name: Munk, Axel
name: Wittich, Olaf
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G05, 62G20 (Primary); 41A10, 41A25 (Secondary)

description: We study the asymptotic behavior of piecewise constant least squares regression estimates, when the number of partitions of the estimate is penalized. We show that the estimator is consistent in the relevant metric if the signal is in $L^2([0,1])$, the space of càdlàg functions equipped with the Skorokhod metric or $C([0,1])$ equipped with the supremum metric. Moreover, we consider the family of estimates under a varying smoothing parameter, also called scale space. We prove convergence of the empirical scale space towards its deterministic target.
description: Published at http://dx.doi.org/10.1214/074921707000000274 in the IMS Lecture Notes Monograph Series (http://www.imstat.org/publications/lecnotes.htm) by the Institute of Mathematical Statistics (http://www.imstat.org)
Chandra monitoring observations of the ultraluminous X-ray source NGC 5204 X-1
Creators: name: Roberts, T. P.
name: Kilgard, R. E.
name: Warwick, R. S.
name: Goad, M. R.
name: Ward, M. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the results of a 2-month campaign conducted with the Chandra X-ray observatory to monitor the ultraluminous X-ray source (ULX) NGC 5204 X-1. This was composed of a 50-ks observation, followed by ten 5-ks follow-ups spaced initially at ~ 3, then at ~ 10 day intervals. The ULX flux is seen to vary by factors ~ 5 on timescales of a few days, but no strong variability is seen on timescales shorter than an hour. There is no evidence for a periodic signal in the X-ray data. An examination of the X-ray colour variations over the period of the campaign shows the ULX emission consistently becomes spectrally harder as its flux increases. The X-ray spectrum from the 50-ks observation can be fitted by a number of disparate spectral models, all of which describe a smooth continuum with, unusually for a ULX, a broad emission feature evident at 0.96 keV. The spectral variations, both within the 50-ks observation and over the course of the whole campaign, can then be explained solely by variations in the continuum component. In the context of an optically-thick corona model (as found in other recent results for ULXs) the spectral variations can be explained by the heating of the corona as the luminosity of the ULX increases, consistent with the behaviour of at least one Galactic black hole system in the strongly-Comptonised very high state. We find no new evidence supporting the presence of an intermediate-mass black hole in this ULX.
description: Accepted for publication in MNRAS. 15 pages, 8 figures
On the Coulomb-Sturmian matrix elements of the Coulomb Green's operator
Creators: name: Demir, F.
name: Hlousek, Z. T.
name: Papp, Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The two-body Coulomb Hamiltonian, when calculated in Coulomb-Sturmian basis, has an infinite symmetric tridiagonal form, also known as Jacobi matrix form. This Jacobi matrix structure involves a continued fraction representation for the inverse of the Green's matrix. The continued fraction can be transformed to a ratio of two $_{2}F_{1}$ hypergeometric functions. From this result we find an exact analytic formula for the matrix elements of the Green's operator of the Coulomb Hamiltonian.
description: 8 pages
Dimensional Expressivity Analysis, best-approximation errors, and automated design of parametric quantum circuits
Creators: name: Funcke, Lena
name: Hartung, Tobias
name: Jansen, Karl
name: Kühn, Stefan
name: Schneider, Manuel
name: Stornati, Paolo
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: parametric
variational
hybrid
noise
costs

description: The 38th International Symposium on Lattice Field Theory, Lattice 2021, Zoom/Gather@Massachusetts Institute of Technology, USA, 26 Jul 2021 - 30 Jul 2021; 12 pp. (2021).
description: The design of parametric quantum circuits (PQCs) for efficient use in variational quantum simulations (VQS) is subject to two competing factors. On one hand, the set of states that can be generated by the PQC has to be large enough to contain the solution state. Otherwise, one may at best find the best approximation of the solution restricted to the states generated by the chosen PQC. On the other hand, the PQC should contain as few parametric quantum gates as possible to minimize noise from the quantum device. Thus, when designing a PQC one needs to ensure that there are no redundant parameters. The dimensional expressivity analysis discussed in these proceedings is a means of addressing these counteracting effects. Its main objective is to identify independent and redundant parameters in the PQC. Using this information, superfluous parameters can be removed and the dimension of the space of states that are generated by the PQC can be computed. Knowing the dimension of the physical state space then allows us to deduce whether or not the PQC can reach all physical states. Furthermore, the dimensional expressivity analysis can be implemented efficiently using a hybrid quantum-classical algorithm. This implementation has relatively small overhead costs both for the classical and quantum part of the algorithm and could therefore be used in the future for on-the-fly circuit construction. This would allow for optimized circuits to be used in every loop of a VQS rather than the same PQC for the entire VQS. These proceedings review and extend work in [1, 2].
Geometrical aspects of entropy production in stochastic thermodynamics based on Wasserstein distance
Creators: name: Nakazato, Muka
name: Ito, Sosuke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a relationship between optimal transport theory and stochastic thermodynamics for the Fokker-Planck equation. We show that the lower bound on the entropy production is the action measured by the path length of the $L^2$-Wasserstein distance. Because the $L^2$-Wasserstein distance is a geometric measure of optimal transport theory, our result implies a geometric interpretation of the entropy production. Based on this interpretation, we obtain a thermodynamic trade-off relation between transition time and the entropy production. This thermodynamic trade-off relation is regarded as a thermodynamic speed limit which gives a tighter bound of the entropy production. We also discuss stochastic thermodynamics for the subsystem and derive a lower bound on the partial entropy production as a generalization of the second law of information thermodynamics. Our formalism also provides a geometric picture of the optimal protocol to minimize the entropy production. We illustrate these results by the optimal stochastic heat engine and show a geometrical bound of the efficiency.
description: 16 pages, 6 figures, to appear in Physical Review Research
Elementary equivalence of Chevalley groups over fields
Creators: name: Bunina, E. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Group Theory (math.GR)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 20H20; 03C60

description: It is proved that (elementary) Chevalley groups $G_π(Φ,K)$ and $G_{π'}(Φ',K')$ (or $E_π(Φ,K)$ and $E_{π'}(Φ',K'))$ over infinite fields $K$ and $K'$ of characteristics $\ne 2$, with weight lattices $Λ$ and $Λ'$, respectively, are elementarily equivalent if and only if the root systems $Φ$ and $Φ'$ are isomorphic, the fields $K$ and $K'$ are elementarily equivalent, the lattices $Λ$ and $Λ'$ coincide.
description: 55 pages
A Non-market economy’s admission to the General Agreement of Tariffs and Trade: China’s unique situation
Creators: name: Yan, Yibing
Publisher: name: University of British Columbia
Year: 2008

description: China's GATT application has been regarded as a unique case. This thesis attempts to explore the unique features of China's GATT application. It starts to review the historical background. It will examine the inherent conflict between GATT and non-market economy system. GATT's previous experience with non-market economy countries will be reviewed as well. China's economic reform and its impact on the GATT application are the focus of the thesis. It will discuss the achievements made through the economic reform and its positive influence on China's GATT membership. It will also address the weakness and insufficiency of the reform, and their negative impact on the GATT application. The author concludes that as long as both GATT and China take a practical approach, a compromise is not impossible. The author suggested a variety of accession mechanisms for China to obtain the membership. Although each of the mechanisms has pros and cons, they all provide useful references for China and GATT. The recent U.S. declaration to support China's GATT application and the new compromise made between both China and U.S. serves as a good example.
SuctionNet-1Billion: A Large-Scale Benchmark for Suction Grasping
Creators: name: Cao, Hanwen
name: Fang, Hao-Shu
name: Liu, Wenhai
name: Lu, Cewu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Suction is an important solution for the longstanding robotic grasping problem. Compared with other kinds of grasping, suction grasping is easier to represent and often more reliable in practice. Though preferred in many scenarios, it is not fully investigated and lacks sufficient training data and evaluation benchmarks. To address that, firstly, we propose a new physical model to analytically evaluate seal formation and wrench resistance of a suction grasping, which are two key aspects of grasp success. Secondly, a two-step methodology is adopted to generate annotations on a large-scale dataset collected in real-world cluttered scenarios. Thirdly, a standard online evaluation system is proposed to evaluate suction poses in continuous operation space, which can benchmark different algorithms fairly without the need of exhaustive labeling. Real-robot experiments are conducted to show that our annotations align well with real world. Meanwhile, we propose a method to predict numerous suction poses from an RGB-D image of a cluttered scene and demonstrate our superiority against several previous methods. Result analyses are further provided to help readers better understand the challenges in this area. Data and source code are publicly available at www.graspnet.net.
title: Антика әдебиеті
Creators: name: ELS IPR BOOKS
Publisher: name: EDP Hub (Идипи Хаб), Ай Пи Ар Медиа
Year: 2024

description: Әлем әдебиеті көкжиегінде игілікті ұлы рухани дүние қалдырған антика әдебиетінің мұрасы мәңгілік жасайтыны анық. Оның қайталанбас сұлу әшекейлері мен көз тартар сюжеттерін оқып танып білу — келер ұрпаққа зор тәлім мен тәрбие. Оқу құралында антикалық әдебиеттегі әйгілі сюжеттер мен мифтік образдарды, мысал мен драмалық шығармаларды, терминдер мен нақылдарды, афоризмдерді, теңеулерді нақты атын атап, түсін түстеп, оған ғылыми анализ бен саралау мақсаты көзделген. Оқу құралы «Ежелгі дәуір әдебиеті» пәнін оқитын жоғары оқу орындарының студенттеріне арналған.
Isovector electromagnetic form factors of the nucleon from lattice QCD and the proton radius puzzle
Creators: name: Djukanovic, D.
name: Harris, T.
name: von Hippel, G.
name: Junnarkar, P. M.
name: Meyer, H. B.
name: Mohler, D.
name: Ottnad, K.
name: Schulz, T.
name: Wilhelm, J.
name: Wittig, H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present results for the isovector electromagnetic form factors of the nucleon computed on the CLS ensembles with $N_f=2+1$ flavors of $\mathcal{O}(a)$-improved Wilson fermions and an $\mathcal{O}(a)$-improved vector current. The analysis includes ensembles with four lattice spacings and pion masses ranging from 130 MeV up to 350 MeV and mainly targets the low-$Q^2$ region. In order to remove any bias from unsuppressed excited-state contributions, we investigate several source-sink separations between 1.0 fm and 1.5 fm and apply the summation method as well as explicit two-state fits. The chiral interpolation is performed by applying covariant chiral perturbation theory including vector mesons directly to our form factor data, thus avoiding an auxiliary parametrization of the $Q^2$ dependence. At the physical point, we obtain $μ=4.71(11)_{\mathrm{stat}}(13)_{\mathrm{sys}}$ for the nucleon isovector magnetic moment, in good agreement with the experimental value and $\langle r_\mathrm{M}^2\rangle~=~0.661(30)_{\mathrm{stat}}(11)_{\mathrm{sys}}\,~\mathrm{fm}^2$ for the corresponding square-radius, again in good agreement with the value inferred from the $ep$-scattering determination [Bernauer et~al., Phys. Rev. Lett., 105, 242001 (2010)] of the proton radius. Our estimate for the isovector electric charge radius, $\langle r_\mathrm{E}^2\rangle = 0.800(25)_{\mathrm{stat}}(22)_{\mathrm{sys}}\,~\mathrm{fm}^2$, however, is in slight tension with the larger value inferred from the aforementioned $ep$-scattering data, while being in agreement with the value derived from the 2018 CODATA average for the proton charge radius.
Resonant heating and substrate-mediated cooling of a single C60 molecule in a tunnel junction
Creators: name: Schulze, Gunnar
name: Franke, Katharina J.
name: Pascual, Jose Ignacio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the influence of different metallic substrates on the electron induced heating and heat dissipation of single C60 molecules in the junction of a low temperature scanning tunneling microscope. The electron current passing through the molecule produces a large amount of heat due to electron-phonon coupling, eventually leading to thermal decomposition of the fullerene cage. The power for decomposition varies with electron energy and reflects the resonance structure participating in the transport. The average value for thermal decomposition of C60 on Cu(110) amounts to 21 $μ$W, while it is much lower on Pb(111) (2.9 $μ$W) and on Au(111) (1.0 $μ$W). We ascribe this difference to the amount of charge transfer into C60 upon adsorption on the different surfaces, which facilitates molecular vibron quenching by electron-hole pair creation.
Postmortem memory of public figures in news and social media
Creators: name: West, Robert
name: Leskovec, Jure
name: Potts, Christopher
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Deceased public figures are often said to live on in collective memory. We quantify this phenomenon by tracking mentions of 2,362 public figures in English-language online news and social media (Twitter) one year before and after death. We measure the sharp spike and rapid decay of attention following death and model collective memory as a composition of communicative and cultural memory. Clustering reveals four patterns of post-mortem memory, and regression analysis shows that boosts in media attention are largest for pre-mortem popular anglophones who died a young, unnatural death; that long-term boosts are smallest for leaders and largest for artists; and that, while both the news and Twitter are triggered by young and unnatural deaths, the news additionally curates collective memory when old persons or leaders die. Overall, we illuminate the age-old question who is remembered by society, and the distinct roles of news and social media in collective memory formation.