cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A stability monitoring and advisory system for small ships
Creators: name: Köse, Ercan
Publisher: name: University of British Columbia
Year: 2009

description: Considering the loss of lives and money as a result of marine accidents, the importance of reducing or preventing capsizing of small boats is clearly evident. The research described in this thesis addresses the development of a monitoring and advisory system for the safety of fishing vessels. This system uses environmental information obtained from a number of sensors and proposes corrective action based on a rule-base derived from experiments, theoretical research and human expertise. Improvements in computer technology and the low prices of measurement equipment facilitates the integration of a system based on off-the-shelf devices and subsystems such as a ship's radar system to measure wave properties. The thesis demonstrates that such off-the-shelf devices and subsystems can be used with special purpose software developed to produce a low cost, intelligent safety monitoring and advisory system. This monitoring system is designed based on the following requirements : • The system should measure the minimum amount of data. In order to make system practical and least costly, the equipments already existing onboard should be used. • The system should not interfere with the operation of the ship, since anything interfering with operation is expected to be discarded by the captain or crew. In view of the need for the evaluation of wave parameters at a fast rate, in the order of 30 - 60 seconds, for input into the advisory system, two new techniques (Boxing and thinning techniques) have been developed. Reasonable agreement has been found between these two techniques and conventional techniques, such as Fourier transforms. A fuzzy expert system has been developed as a decision making process for the monitoring and advisory system. Rules forming the basis for the advisory system are presented. An advantage of this modular structure is that new rules may be easily appended to the existing rule-base in view of further knowledge gained through interviewing experts, experiments or theoretical developments. Finally, feasibility of this approach has been demonstrated through numerical simulations of various sea conditions on a range of ship forms.
MPEC 2024-T106 : 2024 RZ87
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 RZ87

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The birth of geometry in exponential random graphs
Creators: name: Akara-pipattana, Pawat
name: Chotibut, Thiparat
name: Evnin, Oleg
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Inspired by the prospect of having discretized spaces emerge from random graphs, we construct a collection of simple and explicit exponential random graph models that enjoy, in an appropriate parameter regime, a roughly constant vertex degree and form very large numbers of simple polygons (triangles or squares). The models avoid the collapse phenomena that plague naive graph Hamiltonians based on triangle or square counts. More than that, statistically significant numbers of other geometric primitives (small pieces of regular lattices, cubes) emerge in our ensemble, even though they are not in any way explicitly pre-programmed into the formulation of the graph Hamiltonian, which only depends on properties of paths of length 2. While much of our motivation comes from hopes to construct a graph-based theory of random geometry (Euclidean quantum gravity), our presentation is completely self-contained within the context of exponential random graph theory, and the range of potential applications is considerably more broad.
description: v3: further clarifications and references added; accepted for publication
ВЛИЯНИЕ ВНЕШНЕГО ДАВЛЕНИЯ НА ПЛОТНОСТЬ ПОЧВЫ
Creators: name: Ю.В. Беховых
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: чернозём выщелоченный
плотность почвы
уплотнение почвы
влажность почвы
почвенное поровое пространство

description: Целью данной работы было исследование влияния внешнего давления на плотность почвы. Объектом изучения был чернозём выщелоченный Приобского плато. Исследование выявило, что увлажнение существенно влияет на изменение плотности почвы под влиянием воздействия внешнего давления. При более высоком увлажнении уплотнение почвы происходит сильнее. Плотность почвы наиболее сильно увеличивается при первых воздействиях. С возрастанием количества внешних воздействий увеличение плотности происходит менее интенсивно.
The rise of graphene
Creators: name: Geim, A. K.
name: Novoselov, K. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene is a rapidly rising star on the horizon of materials science and condensed matter physics. This strictly two-dimensional material exhibits exceptionally high crystal and electronic quality and, despite its short history, has already revealed a cornucopia of new physics and potential applications, which are briefly discussed here. Whereas one can be certain of the realness of applications only when commercial products appear, graphene no longer requires any further proof of its importance in terms of fundamental physics. Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed matter physics, where quantum relativistic phenomena, some of which are unobservable in high energy physics, can now be mimicked and tested in table-top experiments. More generally, graphene represents a conceptually new class of materials that are only one atom thick and, on this basis, offers new inroads into low-dimensional physics that has never ceased to surprise and continues to provide a fertile ground for applications.
description: progress review
On the Approximation Power of Two-Layer Networks of Random ReLUs
Creators: name: Hsu, Daniel
name: Sanford, Clayton
name: Servedio, Rocco A.
name: Vlatakis-Gkaragkounis, Emmanouil-Vasileios
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: This paper considers the following question: how well can depth-two ReLU networks with randomly initialized bottom-level weights represent smooth functions? We give near-matching upper- and lower-bounds for $L_2$-approximation in terms of the Lipschitz constant, the desired accuracy, and the dimension of the problem, as well as similar results in terms of Sobolev norms. Our positive results employ tools from harmonic analysis and ridgelet representation theory, while our lower-bounds are based on (robust versions of) dimensionality arguments.
description: 39 pages, COLT version
КИСЛОТНЫЕ ОСАДКИ КАК СЛЕДСТВИЕ АНТРОПОГЕННОГО ФАКТОРА
Creators: name: В.А. Воскобойникова
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: кислотные дожди
атмосферный воздух
выбросы
загрязнители атмосферы
сера
азот
аэрозоли
примеси
диоксид серы
оксид азота
закисление окружающей среды
антропогенный фактор
промышленность
автотранспорт
электростанции
компоненты воздуха
осадки

description: Кислотные дожди – это очень опасное явление, которое наносит ущерб окружающей среде, а также живой и неживой природе. В данной статье кратко отражены аспекты формирования кислотных осадков как следствие антропогенного фактора. Рассмотрены основные составляющие влияния человека на образование кислотных дождей. Но есть и обратная сторона проблемы: любое загрязнение вызывает защитную реакцию природы, направленную на ее нейтрализацию. Эта способность природы издавна использовалось человеком не самым «рациональным» образом. Кислотные осадки являются проблемой, которая в случае ее бесконтрольного развития, может вызвать в результате существенные экономические и социальные издержки.
Rotating neutron stars with quark cores
Creators: name: Rather, I. A.
name: Rahaman, Usuf
name: Imran, M.
name: Das, H. C.
name: Usmani, A. A.
name: Patra, S. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The rotating neutron star properties are studied with a phase transition to quark matter. The density-dependent relativistic mean-field model (DD-RMF) is employed to study the hadron matter, while the Vector-Enhanced Bag model (vBag) model is used to study the quark matter. The star matter properties like mass, radius,the moment of inertia, rotational frequency, Kerr parameter, and other important quantities are studied to see the effect on quark matter. The maximum mass of rotating neutron star with DD-LZ1 and DD-MEX parameter sets is found to be around 3$M_{\odot}$ for pure hadronic phase and decreases to a value around 2.6$M_{\odot}$ with phase transition to quark matter, which satisfies the recent GW190814 constraints. For DDV, DDVT, and DDVTD parameter sets, the maximum mass decreases to satisfy the 2$M_{\odot}$. The moment of inertia calculated for various DD-RMF parameter sets decreases with the increasing mass satisfying constraints from various measurements. Other important quantities calculated also vary with the bag constant and hence show that the presence of quarks inside neutron stars can also allow us to constraint these quantities to determine a proper EoS. Also, the theoretical study along with the accurate measurement of uniformly rotating neutron star properties may offer some valuable information concerning the high-density part of the equation of state.
description: 17 pages, 18 figures, 2 tables, comments are welcome
INTERFAOL METODIKALAR YORDAMIDA TALABALARDA FIZIKA FANINI O'RGANISHGA BO'LGAN QIZIQISHINI OSHIRISHNING AHAMIYATI
Creators: name: TO'YCHIYEV, NURBEK
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada talabalarning fizika fanini o’rganishda turli qiziqarli tajribalar, hamda fan metodikasi orqali ularda fanga bo’lgan qiziqishini oshirishning ahamiyati haqida so’z boradi. Shuningdek fizika fani bo’yicha ba’zi metodogik fikrlar va tajribalar misol tariqasida beriladi.
Η έννοια της παράδοσης στην εργογραφία του Φώτη Κόντογλου
Creators: name: Καραγιώργος, Παναγιώτης Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Παράδοση
Φώτης Κόντογλου
Tradition
Fotis Kontoglou

description: Σκοπός της διατριβής ήταν η μελέτη της έννοιας της Παράδοσης στο συγγραφικό έργο του Φώτη Κόντογλου. Ευθύς εξαρχής διαφάνηκε η ανάγκη από το ένα μέρος να επιχειρήσουμε μια σύντομη αναφορά στην έννοια της εκκλησιαστικής παράδοσης και από το άλλο να εντοπίσουμε τα χαρακτηριστικά γνωρίσματα του υπό μελέτη συγγραφικού έργου. Η έννοια της παράδοσης ως «ζωή» αποτέλεσε το γνώμονα και την κατευθυντήρια αρχή στη μελέτη μας. Έτσι ενδιαφερθήκαμε για τις απόψεις του συγγραφέα για τον κόσμο, την ελευθερία, τη σχέση του ανθρώπου με το Θεό, την πίστη και το θαύμα, τη χριστιανική ηθική, τη γνώση και τη θεολογία στην Ελλάδα. Όλα αυτά τα θέματα αναπτύχθηκαν και αναλύθηκαν με φόντο το ιστορικό και πολιτισμικό πλαίσιο που έζησε και έγραψε ο Κόντογλου. Ο τρόπος με τον οποίο κατανοεί την παράδοση ο Κόντογλου γίνεται περισσότερο εμφανής όταν μελετά κανείς τις σκέψεις του για τη σχέση Χριστιανισμού – ελληνισμού, το μετασχηματισμού της νεοελληνικής κοινωνίας και τις τάσεις εκσυγχρονισμού της Εκκλησίας στην Ελλάδα. Για το Φώτη Κόντογλου η Παράδοση δεν είναι τίποτα άλλο από την εν Χριστώ ζωή, την οποία περιγράφει με τον ιδιαίτερα προσωπικό του τρόπο.
description: The aim of the present thesis was the study of the meaning of Tradition in the work of Foti Kodoglou writer. Right form the beginning raised the need to venture a short analysis of the ecclesiastical tradition as well as to sum up the particular points of Kodoglou’s work. Our effort took in account the meaning of tradition as “life”. We interested in the author’s opinion of the world, freedom, the relation of man with God, faith and miracle, Christian morality, knowledge and theology in Greece. All these subjects were analyzed in the certain historical and cultural environment were Kodoglou lived and wrote. The way that Kodoglou understand tradition becomes more obvious when one studies his thoughts of the relation Christianity – Greece, the transformation of Greek society and the tendency for modernization in Church. For Foti Kodoglou tradition is nothing else but Christianity life, which is described by his absolutely particular way.
Soft Spheres Make More Mesophases
Creators: name: Glaser, Matthew A.
name: Grason, Gregory M.
name: Kamien, Randall D.
name: Kosmrlj, A.
name: Santangelo, Christian D.
name: Ziherl, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We use both mean-field methods and numerical simulation to study the phase diagram of classical particles interacting with a hard-core and repulsive, soft shoulder. Despite the purely repulsive interaction, this system displays a remarkable array of aggregate phases arising from the competition between the hard-core and shoulder length scales. In the limit of large shoulder width to core size, we argue that this phase diagram has a number of universal features, and classify the set of repulsive shoulders that lead to aggregation at high density. Surprisingly, the phase sequence and aggregate size adjusts so as to keep almost constant inter-aggregate separation.
description: 4 pages, 2 included figures
On the Rate of Error Growth in Time for Numerical Solutions of Nonlinear Dispersive Wave Equations
Creators: name: Ranocha, Hendrik
name: de Luna, Manuel Quezada
name: Ketcheson, David I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M12, 65M70, 65M06, 65M60, 65M20, 35Q35

description: We study the numerical error in solitary wave solutions of nonlinear dispersive wave equations. A number of existing results for discretizations of solitary wave solutions of particular equations indicate that the error grows quadratically in time for numerical methods that do not conserve energy, but grows only linearly for conservative methods. We provide numerical experiments suggesting that this result extends to a very broad class of equations and numerical methods.
A History of Bands in the United States Navy
Creators: name: McCuen, Joseph M.
Publisher: name: Digital Repository at the University of Maryland
Year: 1967

description: ALTHOUGH THE NAVY HAS HAD BANDS SINCE THE EARLY 19TH
CENTURY, LITTLE HAS BEEN WRITTEN CONCERNING THE BACKGROUND,
DEVELOPMENT, AND PURPOSE OF THIS DIVISION OF OUR NAVY.
THIS WORK ENCOMPASSES A DETAILED STUDY OF THE ENTIRE
BAND PROGRAM. IT BEGINS WITH THE ORIGIN OF NAVAL BANOS AND
FOLLOWS THE GROWTH OF THE PROGRAM WITH A DISCUSSION OF THE
U.S. NAVAL ACADEMY BAND, THE U.S. NAVY BAND, THE SCHOOL OF MUSIC, AND THE NUMEROUS GENERAL SERVICE BANDS. THESE INDIVIDUAL
ORGANIZATIONS ARE AMPLIFIED BY DISCUSSING THE MUSICIANS AND
THEIR MUSICAL ABILITIES, THE VARIOUS INSTRUMENTATIONS OF NAVAL
BANDS, THE BANDLEADERS AND THEIR QUALIFICATIONS, THE MUSICAL
REPERTOIRE OF THESE BANDS 1 THE CURRICULUM AT THE SCHOOL AND
ITS EFFECTIVENESS IN TRAINING BANDSMEN, AND THE ABILITIES OF
THESE BANDS AS CONCERT AND DANCE ORGANIZATIONS. FINALLY THE
PROGRAM IS EVALUATED BY TWO SPECIAL REPORTS SUBMITTED TO AND
AT THE REQUEST OF THE BUREAU OF NAVAL PERSONNEL; ONE REPORT
BY A FORMER HEAD OF THE MUSIC PROGRAM, AND THE OTHER BY THE
AMERICAN COUNCIL ON EDUCATION. THE WRITER ALSO INCLUDES HIS
OWN SUGGESTIONS AND CONCLUSIONS BASED ON HIS KNOWLEDGE AS
A NAVY MUSICIAN.
THIS IS THE ONLY HISTORICAL DEVELOPMENT OF THIS SUBJECT
AND HELPS TO EXPLAIN THE PLACE AND IMPORTANCE OF BANDS, BAND
MUSIC, AND THE NAVAL MUSICIAN IN RELATION TO THE OTHER DIVISIONS
OF THE NAVAL SERVICE.
A solar surface dynamo
Creators: name: Voegler, A.
name: Schuessler, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: Observations indicate that the `quiet' solar photosphere outside active regions contains considerable amounts of magnetic energy and magnetic flux, with mixed polarity on small scales. The origin of this flux is unclear. Aims: We test whether local dynamo action of the near-surface convection (granulation) can generate a significant contribution to the observed magnetic flux. Methods: We have carried out MHD simulations of solar surface convection, including the effects of strong stratification, compressibility, partial ionization, radiative transfer, as well as an open lower boundary. Results: Exponential growth of a weak magnetic seed field (with vanishing net flux through the computational box) is found in a simulation run with a magnetic Reynolds number of about 2600. The magnetic energy approaches saturation at a level of a few percent of the total kinetic energy of the convective motions. Near the visible solar surface, the (unsigned) magnetic flux density reaches at least a value of about 25 G. Conclusions: A realistic flow topology of stratified, compressible, non-helical surface convection without enforced recirculation is capable of turbulent local dynamo action near the solar surface.
description: accepted by Astronomy&Astrophysics (Letter)
КИСЛОТНЫЕ ОСАДКИ: МАСШТАБЫ УГРОЗЫ И ПУТИ РЕШЕНИЯ ЭКОЛОГИЧЕСКИХ ПРОБЛЕМ
Creators: name: В.А. Воскобойникова
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: диоксид серы
оксид азота
закисление окружающей среды
антропогенный фактор
промышленность
автотранспорт
электростанции
компоненты воздуха
осадки
тепловые электростанции
кислотообразующие соединения
хлористый водород
горючие ископаемые
воздушные течения
альтернативные источники

description: Развитие промышленности, транспорта, освоение новых источников энергии приводит к тому, что количество промышленных выбросов постоянно увеличивается. В этой статье кратко описаны масштабы и пути решения экологических проблем, связанных с кислотными осадками. Это в основном связано с использованием ископаемого топлива в термоэлектрических установках, промышленных предприятиях, автомобильных двигателях и системах отопления жилых помещений. Рассмотрены и обобщены основные составляющие антропогенного воздействия на образование кислотных дождей. Основная причина кислотных дождей – присутствие в атмосфере оксидов серы и азота, хлористого водорода и других кислотообразующих соединений из-за промышленных выбросов.
Double Copy from Homotopy Algebras
Creators: name: Borsten, Leron
name: Jurco, Branislav
name: Kim, Hyungrok
name: Macrelli, Tommaso
name: Saemann, Christian
name: Wolf, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We show that the BRST Lagrangian double copy construction of $\mathcal{N}=0$ supergravity as the `square' of Yang-Mills theory finds a natural interpretation in terms of homotopy algebras. We significantly expand on our previous work arguing the validity of the double copy at the loop level, and we give a detailed derivation of the double copied Lagrangian and BRST operator. Our constructions are very general and can be applied to a vast set of examples.
description: v2: 168 pages, presentation improved, typos fixed, published version
Theory of Ultracold Superstrings
Creators: name: Snoek, Michiel
name: Vandoren, S.
name: Stoof, H. T. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The combination of a vortex line in a one-dimensional optical lattice with fermions bound to the vortex core makes up an ultracold superstring. We give a detailed derivation of the way to make this supersymmetric string in the laboratory. In particular, we discuss the presence of a fermionic bound state in the vortex core and the tuning of the laser beams needed to achieve supersymmetry. Moreover, we discuss experimental consequences of supersymmetry and identify the precise supersymmetry in the problem. Finally, we make the mathematical connection with string theory.
description: 16 pages, 9 figures, important factor 2 corrected, accepted for publication in PRA
Effective Teaching Practices in Physical Education: Perspectives from Award-Winning Teachers
Creators: name: Debraj Nath, Bhargab Dev Choudhury, Priyanshu Prabal Dutta, Salka Kalai, Rahul Dev Choudhury
Publisher: name: Zenodo
Year: 2024

description: The following paper is a qualitative case study that focuses on the characteristics of effective teacher practices in the context of physical education, assessed by award-winning teachers. Given the significance acknowledged to physical education and students’ health and well-being throughout their lifetime, little is known regarding the approaches used by highly effective physical education teachers. This study intends to fill this gap by carrying out a qualitative analysis of ten PE teachers who received awards for their teaching profession in various educational contexts. Conducting qualitative research involving interviews, class observations, and document study, we determined the patterns of effective teaching behaviors and processes, components of teachers’ innovations, classroom management, and ways to motivate students. The identified conclusions suggest that students’ needs, interests, and preferences should be considered when designing lessons in physical education, using multiple instructional strategies to address difficulties in motor coordination, and incorporating information communication technologies in physical education. It enriches the existing database of research on effective teaching practices in physical education and is beneficial for the preparation of manuals and materials used in the training of physical education teachers and other stakeholders in curriculum development.
Properties of clumps and filaments around galaxy clusters
Creators: name: Angelinelli, M.
name: Ettori, S.
name: Vazza, F.
name: Jones, T. W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report on the possibility of studying the proprieties of cosmic diffuse baryons by studying self-gravitating clumps and filaments connected to galaxy clusters. While filaments are challenging to detect with X-ray observations, the higher density of clumps makes them visible and a viable tracer to study the thermodynamical proprieties of baryons undergoing accretion along cosmic web filaments onto galaxy clusters. We developed new algorithms to identify these structures and applied them to a set of non-radiative cosmological simulations of galaxy clusters at high resolution. We find that in those simulated clusters, the density and temperature of clumps are independent of the mass of the cluster where they reside. We detected a positive correlation between the filament temperature and the host cluster mass. The density and temperature of clumps and filaments also tended to correlate. Both the temperature and density decrease moving outward. We observed that clumps are hotter, more massive, and more luminous if identified closer to the cluster center. Especially in the outermost cluster regions (~3*R500,c or beyond), X-ray observations might already have the potential to locate cosmic filaments based on the distribution of clumps and to allow one to study the thermodynamics of diffuse baryons before they are processed by the intracluster medium.
description: Accepted to A&A; 19 pages, 25 figures
КОЛЬЦЕВАНИЕ КОЛОНИИ УШАНА ОГНЁВА (PLECOTUS OGNEVI) В ПЕЩЕРЕ «АРХЕОЛОГИЧЕСКАЯ» РЕСПУБЛИКИ ХАКАСИЯ
Creators: name: М.В. Пасикова
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: бурый ушан (Plecotus auritus)
ушан Огнёва (Plecotus ognevi)
пещера «Археологическая»

description: В данной статье представлены результаты исследования, связанные с изучением зимующей колонии ушана Огнёва в пещере «Археологическая» и сопоставление полученных данных с литературными. Нами изучены данные по кольцеванию рукокрылых в пещере «Археологическая» с 1997 года и по наши дни.
Μελέτη της προστασίας του μαρμάρου από τη διάβρωση με προηγμένα σύνθετα πολυμερικά επιστρώματα
Creators: name: Μεραχτσάκη, Δόμνα Δήμου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Πολυμερικά
Επιστρώματα
Διάβρωση
Polymer-based
Coatings
Corrosion

description: Σκόπος της διατριβής ήταν η μελέτη της προστασίας του μαρμάρου από τη διάβρωση με προηγμένα σύνθετα πολυμερικά επιστρώματα. Για τη μελέτη επιλέξαμε δυο ειδών μαρμάρα, το μάρμαρο Θάσου και το μάρμαρο Πεντέλης. Τα μάρμαρα επιστρώθηκαν με δυο εμπορικά πυριτικά επιστρώματα, το Rhodorsil RC-70 και το Rhodorsil RC-90, αντίστοιχα του τετρα-αιθοξυ-σιλανίου (TEOS), μετά από πολυμερισμό τους. Επιπλέον, συντέθηκαν ακόμη δυο επιστρώματα με προσθήκη σκόνης νανο-TiO2 στα προηγούμενα πολυμερικά υλικά, και στη συνέχεια επιστρώθηκαν στα μάρμαρα. Έγινε μελέτη της προστατευτικής ικανότητας των επιστρωμάτων στα υποστρώματα με μετρήσεις γωνίας επαφής, μετρήσεις τριχοειδούς υδαταπορρόφησης και μετρήσεις διαπερατότητας του λίθου από τους υδρατμούς. Ταυτόχρονα, μελετήθηκαν τα χαρακτηριστικά των επιστρωμάτων με Μικροσκοπία Ατομικών Δυνάμεων, Ηλεκτρονική Μικροσκοπία Σάρωσης, Φασματοσκοπία υπερύθρου με μετασχηματισμό Fourier και Περιθλασιμετρία ακτίνων Χ.
description: The aim of the present thesis was the study of the protection of marble from corrosion by advanced composite polymer-based coatings. We examine two kinds of marble, Thassos and Pentelic marble. Both were covered with two commercial polymer-based coatings, Rhodorsil RC-70 and Rhodorsil RC-90, after they had been polymerized. Moreover, two more coatings were synthesized, by mixing nano-TiO2 and Rhodorsil RC-70 and Rhodorsil RC-90. The coatings were applied on marbles, too. The corrosion protection ability of coatings was studied by contact angle measurements, water absorption capillary tests and vapor permeability measurements. At the same time, the properties of coatings were examined using Atomic Force Microscopy, Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy and X-ray Diffraction.
Διερεύνηση πρακτικών γραμματισμού δίγλωσσων μαθητών Δημοτικού Σχολείου
Creators: name: Καλαϊτζίδου, Ελισάβετ Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: γραμματισμός
διγλωσσία
πρωτοβάθμια εκπαίδευση
literacy
bilingual
primary school

description: Η παρούσα εργασία ασχολείται με την έννοια του εγγραμματισμού γενικότερα αλλά και ειδικότερα με τον εγγραμματισμό των δίγλωσσων μαθητών. Πραγματοποιείται μία πρώτη γνωριμία με τον όρο γραμματισμός και έπειτα η έρευνα εξειδικεύεται στον εγγραμματισμό των δίγλωσσων μαθητών. Ανιχνεύονται οι τρόποι διδασκαλίας της δεύτερης γλώσσας και επιχειρείται να διερευνηθεί η σχέση διγλωσσίας και σχολικής επίδοσης. Μελετάται επίσης η δίγλωσση εκπαίδευση στην Ελλάδα και η πορεία της από την πρώτη εμφάνισή της μέχρι σήμερα. Από την έρευνα που πραγματοποιήθηκε εξάγονται συμπεράσματα για τον εγγραμματισμό δίγλωσσων μαθητών από σχολεία του κέντρου της Θεσσαλονίκης, με το βασικότερο ότι η εκμάθηση και χρήση της ελληνικής γλώσσας γίνεται εις βάρος της μητρικής, χωρίς να λαμβάνεται υπόψη η αξία της πολιτισμικής κληρονομιάς και η βοήθεια της ίδιας της μητρικής γλώσσας στην εκμάθηση μίας άλλης, ως δεύτερης ή ξένης.
description: This paper deals with the concept of literacy in general and specifically with the literacy of bilingual students. A first acquaintance with the term literacy is held and then, the research specializes in the technological literacy of students and especially bilingual students. The paper detects ways of teaching the second language and attempts to look into the relationship of bilingualism and performance at school. In addition, bilingual education in Greece is studied and the proceeding of its first appearance until today. From the research that was carried out, there are many conclusions concerning the literacy of bilingual students in the center of Thessaloniki city, the most important of which, is that learning and using the Greek language, is against one’s native language and does not take into account the value of the cultural heritage and the support of one’s native language into learning another, either as a second, or as a foreign one.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Νηπιαγωγών (Πανεπιστήμιο Δυτικής Μακεδονίας)
Observation of the Exclusive Reaction e+e- -> phi eta at sqrt{s}=10.58 GeV
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 report the observation of $\e^+e^-\to ϕη$ near $\sqrt{s}$ = 10.58 GeV with 6.5 $σ$ significance in the $K^+K^-γγ$ final state in a data sample of 224 $fb^{-1}$ collected by the BaBar experiment at the PEP-II $e^+e^-$ storage rings. We measure the restricted radiation-corrected cross section to be $σ(\e^+e^- \to ϕη) =$$2.1\pm 0.4 (\mathrm{stat})\pm 0.1(\mathrm{syst}) \mathrm{fb}$ within the range $|\cosθ^*| < 0.8$, where $θ^*$ is the center-of-mass polar angle of the $ϕ$ meson. The $ϕ$ meson is required to be in the invariant mass range of 1.008 $< m_ϕ
description: 7 pages, 4 postscript figues, submitted to PRD-RC
ПОВТОРНЫЕ ОТЛОВЫ ОКОЛЬЦОВАННЫХ РУКОКРЫЛЫХ В ПЕЩЕРЕ «АРХЕОЛОГИЧЕСКАЯ»
Creators: name: М.В. Пасикова
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: bats
пещера «Археологическая

description: В данной статье представлены результаты исследования, связанные с изучением кольцеваний рукокрылых в пещере «Археологическая» и сопоставление полученных данных с литературными. Нами изучены данные по кольцеванию рукокрылых в пещере «Археологическая» с 1997 года и по наши дни.
The Maslov correction in the semiclassical Feynman integral
Creators: name: Horvathy, P. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The Maslov correction to the wave function is to the jump of $-π/2$ in the phase when the system passes through a caustic point. This phenomenon is related to the second variation and to the geometry of paths, as conveniently explained in Feynman's path integral framework. The results can be extended to any system using the semiclassical approximation. The 1-dimensional harmonic oscillator is used to illustrate the different derivations reviewed here.
description: 17 pages, 2 figures
Training Strategies for Deep Learning Gravitational-Wave Searches
Creators: name: Schäfer, Marlin B.
name: Zelenka, Ondřej
name: Nitz, Alexander H.
name: Ohme, Frank
name: Brügmann, Bernd
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Machine Learning (cs.LG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Compact binary systems emit gravitational radiation which is potentially detectable by current Earth bound detectors. Extracting these signals from the instruments' background noise is a complex problem and the computational cost of most current searches depends on the complexity of the source model. Deep learning may be capable of finding signals where current algorithms hit computational limits. Here we restrict our analysis to signals from non-spinning binary black holes and systematically test different strategies by which training data is presented to the networks. To assess the impact of the training strategies, we re-analyze the first published networks and directly compare them to an equivalent matched-filter search. We find that the deep learning algorithms can generalize low signal-to-noise ratio (SNR) signals to high SNR ones but not vice versa. As such, it is not beneficial to provide high SNR signals during training, and fastest convergence is achieved when low SNR samples are provided early on. During testing we found that the networks are sometimes unable to recover any signals when a false alarm probability $<10^{-3}$ is required. We resolve this restriction by applying a modification we call unbounded Softmax replacement (USR) after training. With this alteration we find that the machine learning search retains $\geq 91.5\%$ of the sensitivity of the matched-filter search down to a false-alarm rate of 1 per month.
description: 18 pages, 12 figures, 3 tables, supplemental materials at https://github.com/gwastro/ml-training-strategies
What is the state of the Early Universe?
Creators: name: Mathur, Samir D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: As we follow our Universe to early times, we find that matter was crushed to high densities, somewhat similar to the behavior at a black hole singularity. String theory has made progress in explaining the internal structure of black holes, so we would like to extrapolate the ideas learnt from black holes to the early Universe. If we assume that we want the most probable state of the Universe at early times, then we should look at the kind of state that describes a generic black hole. This suggests a definite equation of state for the matter in the early Universe. Quantum effects can stretch across macroscopic distances in black holes, and these might be important in understanding the early Universe as well.
description: Latex, 16 pages, 5 figures, Proceedings of The International Conference on Gravitation and Cosmology - 07, Pune, Dec 2007; references added and corrected
Buoyant magnetic flux ropes in a magnetized stellar envelope: Idealized numerical 2.5-D MHD simulations
Creators: name: Dorch, S. B. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: The context of this paper is buoyant toroidal magnetic flux ropes, which is a part of flux tube dynamo theory and the framework of solar-like magnetic activity. Aims: The aim is to investigate how twisted magnetic flux ropes interact with a simple magnetized stellar model envelope--a magnetic "convection zone"--especially to examine how the twisted magnetic field component of a flux rope interacts with a poloidal magnetic field in the convection zone. Method: Both the flux ropes and the atmosphere are modelled as idealized 2.5-dimensional concepts using high resolution numerical magneto-hydrodynamic (MHD) simulations. Results: It is illustrated that twisted toroidal magnetic flux ropes can interact with a poloidal magnetic field in the atmosphere to cause a change in both the buoyant rise dynamics and the flux rope's geometrical shape. The details of these changes depend primarily on the polarity and strength of the atmospheric field relative to the field strength of the flux rope. It is suggested that the effects could be verified observationally.
description: 8 pages, 5 figures (9 files), accepted by A&A
СТИЛЬ МОДЕРН В АРХИТЕКТУРЕ САРАТОВА: КЕРАМИКА В ТВОРЧЕСТВЕ П.М. ЗЫБИНА
Creators: name: М.Г. Тиндова
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: архитектура модерна; фасадная майолика; творчество П.М. Зыбина

description: Статья посвящена анализу способов использования керамических украшений в экстерьерах зданий периода модерна на примере творчества архитектора П.М. Зыбина в Саратове. В работе анализируются керамические украшения периодов раннего, зрелого и позднего модерна, с последующей классификацией майолики двух последних периодов по месту расположения на фасаде, по сюжетной тематике, по размеру. Кроме того в статье приводится более детальная типизация по размерам керамических украшений экстерьера зданий Зыбина, с выделением шести основных групп.
Die Unbestimmtheit im Recht
Creators: name: Wlassenko, Nikolaj Alexandrowitsch
Publisher: name: Trier University
Year: 2019
Subjects: subject: Rechtsphilosophie
subject: Unbestimmtheit
subject: law philosophy
subject: vagueness

description: Der vorliegende Artikel hat das Ziel, den Forschungsgegenstand der Unbestimmtheit in der europäischen Rechtswissenschaft herauszustellen. Es wird der Sinn der Unbestimmtheit in der Philosophie, einschließlich der modernen Philosophie, analysiert. Der Artikel unterbreitet den Vorschlag, die Unbestimmtheit als eine positive Eigenschaft des Rechtes zu betrachten. Zu den Erscheinungsformen der Unbestimmtheit im Recht gehören Prinzipien des Rechtes, Rahmengesetze, Bewertungsbegriffe u. a. Besondere Aufmerksamkeit wird dem rechtsanwendenden Ermessen, einschließlich dem gerichtlichen, zugeteilt. Es wird auch vorgeschlagen, die Konkretisierung, vor allem die rechtsschöpfende, als Mittel des Übergangs der Unbestimmtheit zur Bestimmtheit im Recht anzuerkennen. Unbestimmtheit kann als logisch-sprachliche Störung rechtlicher Regelung begriffen werden. Zu unterscheiden sind die logische, die sprachliche und die graphische Unbestimmtheit. Die logische Unbestimmtheit tritt in Form von Widersprüchen in Rechtsnormen und von Lücken in der Gesetzgebung auf. Besondere Aufmerksamkeit wird der Rolle des Europäischen Gerichtshofes für Menschenrechte bei der Überwindung der rechtlichen Unbestimmtheit zugeteilt.
Απεικονίσεις αγοριών στο σύγχρονο ελληνικό παιδικό/ νεανικό μυθιστόρημα
Creators: name: Δαδάτση, Ζωή Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: απεικονίσεις
ανδρική ταυτότητα
παιδική λογοτεχνία
depictions
masculinity
children’s literature

description: Η παρούσα μελέτη επικεντρώνεται στην ανάλυση των απεικονίσεων των αγοριών στη σύγχρονη ελληνική παιδική/ νεανική λογοτεχνία. Ειδικότερα, αποσκοπεί στη διερεύνηση των τρόπων με τους οποίους απεικονίζονται οι κυρίαρχες μορφές ανδρισμού, οι αξίες, οι ρόλοι καθώς και τα χαρακτηριστικά των αγοριών- ηρώων συγκεκριμένων αναγνωσμάτων. Ως προς τη μεθοδολογία της, η έρευνα χρησιμοποιεί την ανάλυση περιεχομένου σε συνδυασμό με την ερμηνευτική μέθοδο. Το υπό ανάλυση υλικό αποτελούν τέσσερα μυθιστορήματα που εμπίπτουν στην κατηγορία του σύγχρονου παιδικού/ νεανικού μυθιστορήματος. Η ανάλυση ανέδειξε, αφενός, την απεικόνιση κυρίαρχων μορφών ανδρισμού που στηρίζονται σε και αναπαράγουν τις παραδοσιακές για τα φύλα θεωρήσεις και δεν παρεκκλίνουν από τα στερεοτυπικά ιδεολογήματα περί ανδρισμού και θηλυκότητας. Ταυτόχρονα, διαπιστώθηκε μια προσπάθεια μετατόπισης και διεύρυνσης της ανδρικής ταυτότητας μέσα από την απεικόνιση εναλλακτικών και «ηπιότερων» μορφών ανδρισμού.
description: The present study focuses on the analysis of boys’ depictions in modern Greek literature for children. More specifically, it aims at exploring the ways in which the prevailing forms of masculinity as well as the values, roles and characteristics of the boys-heroes are depicted in certain novels. Methodologically, the research draws on content analysis as well as the interpretative method. The material analyzed consists of four contemporary children’s novels. Research results show, on one hand, depictions of masculinities that draw upon and reproduce the traditional gender values, not deviating from the stereotypical gender ideology. Yet, at the same time, a possible ideological shift concerning the boundaries of masculinity is revealed, as its “softer” sides are also quite often depicted in the novels discussed.
Gauge Theory and a Dirac Operator on a Noncommutative Space
Creators: name: Habara, Yoshinobu
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: As a tool to carry out the quantization of gauge theory on a noncommutative space, we present a Dirac operator that behaves as a line element of the canonical noncommutative space. Utilizing this operator, we construct the Dixmier trace, which is the regularized trace for infinite-dimensional matrices. We propose the possibility of solving the cosmological constant problem by applying our gauge theory on the noncommutative space.
description: 2 figures, final version
Submersed Micropatterned Structures Control Active Nematic Flow, Topology and Concentration
Creators: name: Thijssen, Kristian
name: Khaladj, Dimitrius
name: Aghvami, S. Ali
name: Gharbi, Mohamed Amine
name: Fraden, Seth
name: Yeomans, Julia M.
name: Hirst, Linda S.
name: Shendruk, Tyler N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Coupling between flows and material properties imbues rheological matter with its wide-ranging applicability, hence the excitement for harnessing the rheology of active fluids for which internal structure and continuous energy injection lead to spontaneous flows and complex, out-of-equilibrium dynamics. We propose and demonstrate a convenient, highly tuneable method for controlling flow, topology and composition within active films. Our approach establishes rheological coupling via the indirect presence of fully submersed micropatterned structures within a thin, underlying oil layer. Simulations reveal that micropatterned structures produce effective virtual boundaries within the superjacent active nematic film due to differences in viscous dissipation as a function of depth. This accessible method of applying position-dependent, effective dissipation to the active films presents a non-intrusive pathway for engineering active microfluidic systems.
description: 16 pages; 5 main-text-figures; 5-supplemental-figures
Locating citizenship across the city politics of AIDS in Vancouver, Canada
Creators: name: Brown, Michael Peter
Publisher: name: University of British Columbia
Year: 2009

description: Chantal Mouffe has proposed a theory of political engagement or “citizenship” that rejects fixed, essential definitions to “the political”. With her pluralistic, non-essentialized political subject, she hopes for a means by which different political struggles can be linked together rather than ordered hierarchically or exclusively. Here citizens are associated in distinct but related struggles, rather than by legal status or community membership. A crucial point in her argument is that political theorists must look for new “spaces” of politics. Since she never expands on this call, we are left with little more than spatial metaphors that fix the locations where citizenship might be found. Political theory typically plots three separate spheres to describe people’s lives: the state, civil society, and the family. By spatializing these metaphorical locations I have taken up her call and explored the emergence of citizenship across these spatialized social relations through an ethnography on AIDS politics in Vancouver, Canada. For each allegedly discrete space in political theory, I note an ongoing restructuring that affects and is affected by the articulation of citizenship with the changes in social relations in place. These restructurings suggest that fixed, essentialized characterizations of space must also be rejected. I sketch the considerable overlap between social relations of state, family, and civil society in locations across Vancouver’s AIDS politics. Radical civil disobedience failed because activists failed to understand the overlap of state and civil society through AIDS service organizations. Within those agencies, political engagement is caught between grassroots community orientations (civil society) and the emergence of a large, rapidly bureaucratizing service system attached to the state. Volunteers who provide all manner of support (from social work to kinship) for people living with AIDS likewise complicate any clearcut distinction between state and family. The overlap of the family with civil society is illustrated by the Vancouver display of the AIDS Quilt. It was at once a fundraising event held in civil society, yet it was also a familial space: allowing families and friends to grieve and mourn their dead. Spatial overlaps enabled (and also constrained) citizenship, as Mouffe defines it. These hybrid spaces articulate de-centered citizens with the ongoing restructurings of state, civil society, and family that are concurrent to the AIDS epidemic. Consequently, I conclude that future work on radical democratic citizenship consider the contexts in which the citizen engages in political struggle.
ПРОСТРАНСТВО ЦВЕТА КАК МЕТОДОЛОГИЧЕСКИЙ ИНСТРУМЕНТ ПОЗНАНИЯ КУЛЬТУРНОГО РАЗНООБРАЗИЯ
Creators: name: Б.Н. Герасимов
Publisher: name: Международный журнал гуманитарных и естественных наук
Year: 2021
Subjects: культура
цвет
восприятие
психология
эстетика
образование
коммуникации
эмоции

description: Природа и проявление цвета является неотъемлемой частью жизнедеятельности современного человека, средством иллюстрации его гносеологического и онтологического познания культуры, сознания и эстетики бытия. Многие исследователи в течение веков пытаются понять природу цвета, объяснить его формы, содержание и атрибуты, вместить цвет в различные методологические концепции и парадигмы. Цвет, чаще всего, воспринимается, как ощущение, имеющее пространственную, эмоциональную, эстетическую и ассоциативную окраску, обогащает человека категориями красоты, гармонии, создавая настроение и образы. Цветовые восприятия проявляются и в профессиональной деятельности людей и оказывают на них воздействия, усиливая или ослабляя атрибуты менеджмента, проявляющие себя в коммуникационном пространстве.
ELEKTROMAGNIT MAYDONNING QONDAGI MODDALARGA TA'SIRI
Creators: name: To'xtasinov, Oybekjon
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada elektromagnit maydonning qonga ta'siri va uning tarkibidagi o'zgarishlar ko'rib chiqiladi. Qonning murakkab tuzilishi, turli moddalarning elektromagnit maydonlar bilan o'zaro ta'siri va buning organizmga ta'siri haqida ma'lumotlar beriladi. Maqola, shuningdek, elektromagnit maydonlarning qizil va oq qon hujayralari, plazma va trombositlar ustidagi ta'sirlarini tahlil qiladi, bu esa tibbiyotda yangi davolash usullarini ishlab chiqish uchun muhim ahamiyatga ega.