cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Zeeman splitting of light hole in quantum wells: comparison of theory and experiments
Creators: name: Durnev, M. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The theory for light-hole Zeeman splitting developed in [Physica E 44, 797 (2012)] is compared with experimental data found in literature for GaAs/AlGaAs, InGaAs/InP and CdTe/CdMgTe quantum wells. It is shown that the description of experiments is possible with account for excitonic effects and peculiarities of the hole energy spectrum in a quantum well including complex structure of the valence band and the interface mixing of light and heavy holes. It is demonstrated that the absolute values and the sign of the light-hole $g$-factor are extremely sensitive to the parametrization of the Luttinger Hamiltonian.
description: 8 pages, 4 figures, 2 tables
АЛГОРИТМ РАСПОЗНАВАНИЯ ДОРОЖНЫХ ЗНАКОВ
Creators: name: Р.М. Енокаев
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: Машинное зрение
OpenCV
дорожные знаки
контурный анализ
обработка изображений
цветовой фильтр.

description: В статье предлагается алгоритм распознавания дорожных знаков, на основе поиска цветных контуров, захвата кадра и попиксельного сравнения изображений, реализованного на языке программирования Python 2.7 и библиотеке алгоритмов машинного зрения Op enCV 3.0, для Всероссийского робототехнического фестиваля ROBOFEST 2020 AutoNet 18+.
Detecting a decline in serial homicide: Have we banished the devil from the details?
Creators: name: Yaksic, Enzo
name: Allely, Clare
name: De Silva, Raneesha
name: Smith-Inglis, Melissa
name: Konikoff, Daniel
name: Ryan, Kori
name: Gordon, Dan
name: Denisov, Egor
name: Keatley, David A.
name: Chan, Heng Choon
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Mental Health
subject: Hematology
subject: Computational Biology

description: The current research provides perspective regarding the true prevalence of serial murderers in modern society and addresses the conflict between the evidenced decline in serial homicide and the viewpoint that the phenomenon is increasing. The likelihood that serial murderers are responsible for most unresolved homicides and missing persons is examined in the context of a declining prevalence. A mixed methods approach was used, consisting of a review of a sample of unresolved homicides, a comparative analysis of the frequency of known serial homicide series and unresolved serial homicide series, and semi-structured interviews of experts. In failing to become serial killers, aspiring and probable serial killers and spree killers have impacted the rate of serial murder by not reaching their potential. The past decade contained almost half the cases (13%) that existed at the 1980s peak of serial homicide (27%). Only 282 (1.3%) strangled females made up the 22,444 unresolved homicides reviewed. Most expert respondents thought it unreasonable that any meaningful proportion of missing persons cases are victims of serial homicide. Technology, shifts in offending behavior, proactive law enforcement action, and vigilance of society have transformed serial killing and aids in viewing offenders as people impacted by societal shifts and cultural norms. The absence of narrative details inhibited some aspects of the review. An exhaustive list of known unresolved serial homicide series remained elusive as some missing persons are never reported. Future research should incorporate those intending to murder serially, but whose efforts were stalled by arrest, imprisonment, or death.
What is a horocyclic product, and how is it related to lamplighters?
Creators: name: Woess, Wolfgang
Publisher: name: arXiv
Year: 2014
Subjects: subject: Group Theory (math.GR)
subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 05C63, 20F65, 22E40, 57S25

description: This is a rather personal introductory outline of an interesting class of geometric, resp. graph- and group-theoretical structures. After an introductive section about their genesis, the general construction of horocyclic products is presented. Three closely related basic structures of this type are explained in more detail: Diestel-Leader graphs, treebolic spaces, and Sol-groups, resp. -manifolds. Emphasis is on their geometry, isometry groups, quasi-isometry classification and boundary at infinity. Subsequently, it is clarified under which parametrisation they admit discrete groups of isometries acting with compact quotient. Finally, further develpoments are reviewed briefly. Remark: the posted version contains a correction of a misprint that appeared on the bottom of page 22 in the version which appeared in IMN.
КЛАССИФИКАЦИЯ МУЗЫКАЛЬНЫХ КОМПОЗИЦИЙ ПО ИСПОЛНИТЕЛЯМ НА ОСНОВЕ МАШИННОГО ОБУЧЕНИЯ
Creators: name: Т.А. Приходько
name: Н.С. Лысенко
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: машинное обучение
классификация
спектр
звуковой сигнал
мел-частотные кепстральные коэффициенты
скрытые марковские модели
дискретное преобразование Фурье.

description: В рамках данной работы выполнено исследование алгоритмов машинного обучения для идентификации музыкальных композиций по исполнителям на основе характеристик звуковых сигналов, которое в дальнейшем планируется применить для создания классификатора музыкальных произведений по жанрам. Обучен и протестирован классификатор по исполнителям.
ИСПОЛЬЗОВАНИЕ ПОКАЗАТЕЛЯ ХЕРСТА ДЛЯ АНАЛИЗА ФИНАНСОВЫХ ВРЕМЕННЫХ РЯДОВ
Creators: name: Ю.А. Молодниченко
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: анализ временных рядов
показатель Хёрста
R/S анализ
долгая память
фрактальность.

description: В работе представлен алгоритм R/S анализа, а также анализ динамики показателя Херста, полученных в результате применения R/S-алгоритма в заданном окне скольжения. Были проанализированы ценные бумаги АО «Магнит».
Manifestation of a spin-splitting field in a thermally-biased Josephson junction
Creators: name: Bergeret, F. S.
name: Giazotto, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the behavior of a Josephson junction consisting of a ferromagnetic insulator-superconductor (FI-S) bilayer tunnel-coupled to a superconducting electrode. We show that the Josephson coupling in the structure is strenghtened by the presence of the spin-splitting field induced in the FI-S bilayer. Such strenghtening manifests itself as an increase of the critical current $I_c$ with the amplitude of the exchange field. Furthermore, the effect can be strongly enhanced if the junction is taken out of equilibrium by a temperature bias. We propose a realistic setup to assess experimentally the magnitude of the induced exchange field, and predict a drastic deviation of the $I_c(T)$ curve ($T$ is the temperature) with respect to equilibrium.
description: 4.5 pages, 3 color figures
ВЕРОЯТНОСТНО-СТАТИСТИЧЕСКОЕ МОДЕЛИРОВАНИЕ В КОМАНДНЫХ ВИДАХ СПОРТА
Creators: name: Т.М. Панеш
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: командные виды спорта
футбол
кластерный анализ
факторный анализ
прогнозирование при помощи множественных регрессионных моделей.

description: Игровые командные виды спорта – это огромная индустрия, сравнимая с традиционными экономическими отраслями. В числовом выражении это десятки и десятки миллиардов долларов. Естественно, такая отрасль для эффективного принятия решений требует научного, в том числе и математического подхода. В рамках данной работы было проведено аналитическое исследование результатов игр команд по футболу «Российской Премьер-Лиги» (РПЛ) сезона 18-19. Во время исследования были применены методы многомерного статистического анализа в среде пакета STATISTICA.
“This book is my life…”: A qualitative feasibility study on the use of a self-management support tool
Creators: name: Dube, Loveness
name: Bergh, Anne-Marie
name: van den Broucke, Stephan
name: D’Hoore, William
name: Hale, Rachel
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: As self-management support is a cost-effective way to enable patients to take an active role in managing their own condition and to address the chronic disease burden, there is a need for contextually appropriate self-management support tools. This study explored the feasibility of using a contextually adapted self-management care-plan booklet for diabetes and hypertension for use in medical consultations in a middle-income country. Focus groups and individual interviews with patients and health care providers were conducted in three primary health care facilities. Four relevant focus areas for feasibility studies were used as the lens for data analysis: acceptability, demand, implementation, practicality. The study revealed a high acceptance of the care-plan booklet by both patients and providers. Patients reported that the booklet increased their knowledge of their conditions. They also indicated that they would share the booklet with friends and families and expressed the need to use it with their providers. Providers mentioned that community health workers and health promoters could play an important role in implementing the tool. The findings of this study contribute to the knowledge base needed for the development and adoption of the self-management component of the South African integrated chronic diseases model. The care-plan booklet can be used to stimulate the interaction between patients, providers and/or family and friends.
Polarization observables in lepton-deuteron elastic scattering including the lepton mass
Creators: name: Gakh, G. I.
name: Gakh, A. G.
name: Tomasi--Gustafsson, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Expressions for the unpolarized differential cross section and for various polarization observables in the lepton-deuteron elastic scattering, $\ell+D\to \ell+D$, $\ell=e$, $μ$, $τ$, have been obtained in one-photon-exchange approximation, taking into account the lepton mass. Polarization effects have been investigated for the case of a polarized lepton beam and polarized deuteron target which can have vector or tensor polarization. Numerical estimations of the lepton mass effects have been done for the unpolarized differential cross section and for some polarization observables and applied to the case of low energy muon deuteron elastic scattering.
description: 29 pages, 6 figure
Exploring large astronomical data archives for the characterization of space debris
Creators: name:  ELISABETH RACHITH
name:   STEPHAN HELLMICH
name:   BELEN YU IRURETA-GOYENA CHANG
name:   JEAN-PAUL KNEIB
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: SPACE-DEBRIS
MACHINE LEARNING
DATA PROCESSING

description: This work aims to gain a deeper understanding of the current state of the orbital debris population. We are currently developing new and innovative methods to efficiently extract observations of satellites, debris and solar system objects from large astronomical data archives. The data obtained from these archives will provide valuable insights into the size-frequency distribution of orbital debris and their physical properties and support the development of strategies to maintain the usability of Earth\'s orbit for future satellite missions. This paper is an outline of the current status and future developments of our research.
Error analysis of the density-matrix renormalization group algorithm for a chain of harmonic oscillators
Creators: name: Ma, Yongjun
name: Wang, Jiaxiang
name: Xu, Xinye
name: Wei, Qi
name: Kais, Sabre
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the application of the density-matrix renormalization group (DMRG) algorithm to a one-dimensional harmonic oscillator chain and compare the results with exact solutions, aiming to improve the algorithm efficiency. It has been demonstrated that the algorithm can give quite accurate results if the procedure is proper organized, for example, by using the optimized bases. The errors of calculated ground state energy and the energy gap between the ground state and the first excited state are analyzed, which are found to be critically dependent upon the size of the system or the energy level structure of the studied system and the number of states targeted during the DMRG procedure.
РАСПРЕДЕЛЕННАЯ СИСТЕМА СБОРА ЗНАНИЙ В ЗАДАЧАХ ОБУЧЕНИЯ ИСКУССТВЕННОГО ИНТЕЛЛЕКТА
Creators: name: Н.Ю. Добровольская
name: А.С. Сысоев
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: распределённая система
искусственный интеллект
знания
интеллектуальная система
оживление персонажа.

description: В рамках данной работы разработана распределённая система сбора знаний для обучения технологии искусственного интеллекта. Пользователи, работая в клиентском приложении, пополняют знаниями интеллектуальную систему для того, чтобы эти данные были проверены с помощью статистических методов и загружены в «мозг» технологии искусственного интеллекта для оживления персонажа.
Cooling system analysis of a clustered module aerospike for upper-stage applications
Creators: name:  ALESSIO SERENO
name:   MATTEO FIORE
name:   DANIELE BIANCHI
name:   FRANCESCO NASUTI
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: LIQUID ROCKET ENGINES
AEROSPIKE
REGENERATIVE COOLING
CFD

description: One of the obstacles in developing annular aerospike nozzles involves effectively managing thermal loads caused by the wide surface area exposed to high heat flux. A modular design is usually proposed as a solution, at the cost of performance reduction. In this framework, the present work focuses on the critical analysis of the design of a regenerative cooling system for a modular aerospike upper-stage LOX/CH4 liquid rocket engine, with a counter-flow cooling circuit fed by methane. Simplified heat transfer models are used to examine channel geometries, and the chosen design is validated through a conjugate heat transfer simulation. Results show that for the present nozzle size a good compromise between thermal management and pressure drop can be obtained, provided that the cooling channels design is suitably realized.
ДИАЛОГОВАЯ СИСТЕМА СЛУЖБЫ ПОДДЕРЖКИ НА ОСНОВЕ ГЛУБОКОГО ОБУЧЕНИЯ
Creators: name: А.А. Полупанов
name: С.А. Королев
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: глубокое обучение
рекуррентная нейронная сеть
управляемый рекуррентный блок
диалоговая система
механизм внимания.

description: В статье рассматривается одна из основных задач обработки естественного языка − задача генерации текста, тематикой которого являются фрагменты программного кода на языке Python. Приводится подробная постановка задачи, реализуется sequence-to-sequence модель с механизмом внимания, состоящая из двух двунаправленных рекуррентных нейронных сетей с управляемыми рекуррентными блоками. Описаны основные составляющие архитектуры реализованной модели. В статье приводится график изменения функции потерь модели в процессе обучения.
Love Beyond Death:  Suicide, Acceptance and the Awakening of the Bereaved
Creators: Kostromin, Elizabeth A.
Publisher: name: University of Alberta Library
Year: 2022

In the West today suicide is considered a major public health issue of tragic consequence; universally devastating to those it bereaves. This enquiry explored an unusual experience of bereavement by suicide for the purpose of challenging common cultural beliefs, including that: suicide is violent, irrational, tragic, selfish, unexpected and always the result of mental illness, and; that those bereaved by suicide are inevitably guilt-laden, devastated, angry and ashamed. The research methodology was autoethnography within the context of a spiritual research paradigm. Analysis and interpretation drew upon three complementary approaches/orientations: Buber’s philosophy of dialogue, critical theory and hermeneutic interpretive phenomenology. Findings consist of narrative compositions which illustrate how a lived spiritual orientation can not only ameliorate the effects of suicide bereavement and insulate survivors from social stigma but may also trigger an awakening of the bereaved. This lived spirituality included: a cosmic perspective; an openness of heart and mind; the recognition and valuing of relationship and connection; a stance of humility with respect to one’s capacity to influence another’s intentions; an acceptance of the ‘unacceptable’; the willingness to fully face the prospect of a loved one’s intentional death, and; enduring attempts to ‘be’ unconditional love. This research creates space in which freedom from oppressive social forces can be conceived and invites psychotherapy practitioners into deeper relating in support of spiritual maturation.
Pion femtoscopy measurements in ALICE at the LHC
Creators: name: Graczykowski, Łukasz Kamil
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the results of two-pion Bose-Einstein correlations measured in Pb--Pb collisions at a center-of-mass energy sqrt(s_NN) = 2.76 TeV recorded by ALICE at the Large Hadron Collider. These types of correlations allow to extract, using the technique of femtoscopy (also known as Hanburry-Brown Twiss interferometry, or shortly HBT), the space-time characteristics of the source from the correlation calculated as a function of the pair momentum difference. The femtoscopic analysis was performed using both the Spherical Harmonics decomposition and the standard 3D Cartesian representation of the correlation function. The source sizes in three dimensions, the HBT radii, were extracted by fitting the experimental correlation functions. The resulting dependencies of the radii as a function of centrality and pair transverse momentum are shown. The results indicate the existence of a flowing medium and provide constraints on existing dynamical models. The ALICE Pb-Pb HBT radii are also compared to the pp analysis and other heavy-ion experiments in order to test the multiplicity scaling between different systems.
description: 7 pages, 5 figures, submitted to the European Physical Journal: Web of Conferences (proceedings of ICNFP 2013 conference)
A summer school in Optimization and Decision Support Systems for Supply Chains
Creators: name: Bruno, Giuseppe
name: Amaro, Ana
name: Casquilho, Miguel
name: Corominas, Albert
name: Genovese, Andrea
name: Lopez, Juan Manuel Garcia
name: Lusa, Amaia
name: Magnusson, Johan
name: Matos, Henrique
name: Joao Miranda
name: Rubio, Sergio
Publisher: name: Zenodo
Year: 2012
Subjects: Optimization
Decision Support Systems
Supply Chains

description: Our Summer School is taking place in Portalegre, Portugal, July, 1-15, within the Erasmus Intensive Programme. The audience is formed by MSc./PhD. students on Engineering and Logistics specialties, from more than 12 countries. It aims at: (a) describing the industry-based supply chain operations with a particular concern to the green logistic aspects; (b) using optimization models to solve specific problems. The lectures follow a pull approach, from distribution to supply subjects; the lab sessions are supported by IBM/ILOG. We present the program and the future perspectives.
description: Intensive Programme (Summer School in JUL2012): Proc. N.º 08664/P PORTALE01/ERA10 IP 2011-2012
description: {"references": ["https://www.springer.com/in/book/9783319424194"]}
Spin-isospin Response in Finite Nuclei from an Extended Skyrme Interaction
Creators: name: Wen, Peiwei
name: Cao, Li-Gang
name: Margueron, J.
name: Sagawa, H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The magnetic dipole (M1) and the Gamow-Teller (GT) excitations of finite nuclei have been studied in a fully self-consistent Hartree-Fock (HF) plus random phase approximation (RPA) approach by using a Skyrme energy density functional with spin and spin-isospin densities. To this end, we adopt the extended SLy5st interaction which includes spin-density dependent terms and stabilize nuclear matter with respect to spin instabilities. The effect of the spin-density dependent terms is examined in both the mean field and the spin-flip excited state calculations. The numerical results show that those terms give appreciable repulsive contributions to the M1 and GT response functions of finite nuclei.
description: 6 pages, 2 figures
Tuning the band gap of PbCrO4 through high-pressure: Evidence of wide-to-narrow semiconductor transitions
Creators: name: Errandonea, D.
name: Bandiello, E.
name: Segura, A.
name: Hamlin, J. J.
name: Maple, M. B.
name: Rodriguez-Hernandez, P.
name: Munoz, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The electronic transport properties and optical properties of lead(II) chromate (PbCrO4) have been studied at high pressure by means of resistivity, Hall-effect, and optical-absorption measurements. Band-structure first-principle calculations have been also performed. We found that the low-pressure phase is a direct band-gap semiconductor (Eg = 2.3 eV) that shows a high resistivity. At 3.5 GPa, associated to a structural phase transition, a band-gap collapse takes place, becoming Eg = 1.8 eV. At the same pressure the resistivity suddenly decreases due to an increase of the carrier concentration. In the HP phase, PbCrO4 behaves as an n-type semiconductor, with a donor level probably associated to the formation of oxygen vacancies. At 15 GPa a second phase transition occurs to a phase with Eg = 1.2 eV. In this phase, the resistivity increases as pressure does probably due to the self-compensation of donor levels and the augmentation of the scattering of electrons with ionized impurities. In the three phases the band gap red shifts under compression. At 20 GPa, Eg reaches a value of 0.8 eV, behaving PbCrO4 as a narrow-gap semiconductor.
description: 24 pages, 5 figures
ИСПОЛЬЗОВАНИЕ МЕТОДОВ МАШИННОГО ОБУЧЕНИЯ И НЕЙРОННЫХ СЕТЕЙ ДЛЯ ПРОГНОЗИРОВАНИЯ И АНАЛИЗА СОЦИАЛЬНО-ЭКОНОМИЧЕСКОГО РАЗВИТИЯ ГОРОДСКИХ ОКРУГОВ, РАЙОНОВ И ПОСЕЛЕНИЙ КРАСНОДАРСКОГО КРАЯ
Creators: name: А.В. Коваленко
name: Д.А. Сюсюра
Publisher: name: Прикладная математика: современные проблемы математики, информатики и моделирования
Year: 2020
Subjects: нейронные сети
классификационное прогнозирование
анализ
зависимость коэффициентов
Краснодарский край
качественные и количественные показатели.

description: В рамках данной работы разработана нейронная сеть способная определять и прогнозировать рейтинг социально-экономического развития региона и его инвестиционной привлекательности. И, кроме того, с помощью машинного обучения удалось добиться проведения качественного и количественного анализа показателей, определяющих это развитие и автоматизировать систему.
Gesture Based Interaction NUI: An Overview
Creators: name: Kaushik, Dr Manju
name: Jain, Rashmi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Touch,face,voice recognition and movement sensors all are part of an emerging field of computing often called natural user interface, or NUI. Interacting with technology in these humanistic ways is no longer limited to high tech secret agents. Gesture Touch, face, voice recognition and movement sensors all are part of an emerging field of computing often called natural user interface, or NUI. Interacting with technology in these humanistic ways is no longer limited to high tech secret agents. Gesture recognition is the process by which gestures formed by a user are made known to the system. In completely immersive VR environments, the keyboard is generally not included, Technology incorporates face, voice, gesture, and object recognition to give users a variety of ways to interact with the console, all without needing a controller. This paper focuses on the emerging way of human computer interaction, Gesture recognition concept and gesture types.
description: 4 pages."Published with International Journal of Engineering Trends and Technology (IJETT)"
Thermal escape from extrasolar giant planets
Creators: name: Koskinen, T. T.
name: Lavvas, P.
name: Harris, M. J.
name: Yelle, R. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The detection of hot atomic hydrogen and heavy atoms and ions at high altitudes around close-in extrasolar giant planets (EGPs) such as HD209458b imply that these planets have hot and rapidly escaping atmospheres that extend to several planetary radii. These characteristics, however, cannot be generalized to all close-in EGPs. The thermal escape mechanism and mass loss rate from EGPs depend on a complex interplay between photochemistry and radiative transfer driven by the stellar UV radiation. In this work we explore how these processes change under different levels of irradiation on giant planets with different characteristics. We confirm that there are two distinct regimes of thermal escape from EGPs, and that the transition between these regimes is relatively sharp. Our results have implications on thermal mass loss rates from different EGPs that we discuss in the context of currently known planets and the detectability of their upper atmospheres.
description: 19 pages, 2 figures, accepted to Philosophical Transactions of the Royal Society A
Deep reinforcement learning for spacecraft attitude tracking manoeuvres
Creators: name:  JALOETTGEN
name:   MATTEO CERIOTTI
name:   GERARDO ARAGON-CAMARASA
name:   KEVIN WORRALL
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: SPACECRAFT ATTITDUE CONTROL
DEEP REINFORCEMENT LEARNING
ATTITUDE TRACKING

description: This paper investigates the application of Deep Reinforcement Learning (DRL) for attitude tracking manoeuvres of a 6U-CubeSat. The desired reference trajectories to be tracked are generated using the quaternion SLERP and SQUAD algorithms. The use of Long Short-Term Memory layers to reconstruct temporal angular velocity information that would otherwise be unobservable by the controller is investigated. It is demonstrated that DRL-based controllers that use a direction cosine matrix-based attitude parameterisation perform better than controllers that use a quaternion attitude parameterisation. The performance of the DRL controller is compared against a tuned quaternion rate feedback controller in Monte Carlo simulations.
Distributed Vertex Cover Algorithms For Wireless Sensor Networks
Creators: name: Kavalci, Vedat
name: Ural, Aybars
name: Dagdeviren, Orhan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Vertex covering has important applications for wireless sensor networks such as monitoring link failures, facility location, clustering, and data aggregation. In this study, we designed three algorithms for constructing vertex cover in wireless sensor networks. The first algorithm, which is an adaption of the Parnas & Ron's algorithm, is a greedy approach that finds a vertex cover by using the degrees of the nodes. The second algorithm finds a vertex cover from graph matching where Hoepman's weighted matching algorithm is used. The third algorithm firstly forms a breadth-first search tree and then constructs a vertex cover by selecting nodes with predefined levels from breadth-first tree. We show the operation of the designed algorithms, analyze them, and provide the simulation results in the TOSSIM environment. Finally we have implemented, compared and assessed all these approaches. The transmitted message count of the first algorithm is smallest among other algorithms where the third algorithm has turned out to be presenting the best results in vertex cover approximation ratio.
A Geometrical-Based Throughput Bound Analysis for Device-to-Device Communications in Cellular Networks
Creators: name: Ni, Minming
name: Zheng, Lei
name: Tong, Fei
name: Pan, Jianping
name: Cai, Lin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Device-to-device (D2D) communications in cellular networks are promising technologies for improving network throughput, spectrum efficiency, and transmission delay. In this paper, we first introduce the concept of guard distance to explore a proper system model for enabling multiple concurrent D2D pairs in the same cell. Considering the Signal to Interference Ratio (SIR) requirements for both macro-cell and D2D communications, a geometrical method is proposed to obtain the guard distances from a D2D user equipment (DUE) to the base station (BS), to the transmitting cellular user equipment (CUE), and to other communicating D2D pairs, respectively, when the uplink resource is reused. By utilizing the guard distances, we then derive the bounds of the maximum throughput improvement provided by D2D communications in a cell. Extensive simulations are conducted to demonstrate the impact of different parameters on the optimal maximum throughput. We believe that the obtained results can provide useful guidelines for the deployment of future cellular networks with underlaying D2D communications.
description: Submitted to IEEE Journal on Selected Areas in Communications, Special Issue on D2D Communications in Cellular Networks
Data for Knowledge co-production reveals nuanced societal dynamics and sectoral connections in modelling sustainable human-natural systems
Creators: name: Szetey, Katrina
name: Moallemi, Enayat A.
name: Bryan, Brett A
Publisher: name: Zenodo
Year: 2023

description: The data generated from the systems mapping workshop in Forrest as part of the Local SDGs project. The data is represented in images, transcribed from the posters completed in the workshop.
A review of security attacks and Intrusion Detection Schemes in Wireless Sensor Networks
Creators: name: Maleh, Y.
name: Ezzati, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Wireless Sensor Networks (WSNs) are currently used in different industrial and consumer applications, such as earth monitoring, health related applications, natural disaster prevention, and many other areas. Security is one of the major aspects of Wireless sensor networks due to the resource limitations of sensor nodes. However, these networks are facing several threats that affect their functioning and their life. In this paper we present security attacks in wireless sensor networks, and we focus on a review and analysis of the recent Intrusion Detection schemes in WSNs.
description: 12 pages with 9 figures
Time-Resolved 3D Characterization of the Plume of a Low-Power Ablative Pulsed Plasma Thruster
Creators: name:  SCHEREZADE BARQUERO
name:   MARIO MERINO
name:   JAUME NAVARRO-CAVALLE
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: PULSED PLASMA THRUSTER
PTFE
PLASMA DIAGNOSTICS
PLUME DIVERGENCE
ELECTRIC PROPULSION
MICROPROPULSION

description: The transient exhaust of an ablative Pulsed Plasma Thruster PPT is characterized experimentally at different discharge voltages, always below 8 J of energy. The time series measured by three plasma probes operated at the ion saturation regime and placed at various distances downstream from the device are fitted to a model of the discharge. This model discretizes the exhaust into separate Maxwellian ion groups. Each group is characterized by its own parameters: mean velocity, thermal spread, amplitude of the signal, time of creation, and divergence. Results show that a good fit is possible only considering three ion groups for all the explored operating points. The order of magnitude of the velocity for each group is found to be about 50, 35 and under 20 km/s. Plume current increases with the discharge energy, while the first ion group velocity slightly decreases with the discharge voltage. The thermal spread is always below 20 km/s. Keywords: Ablative Pulsed Plasma Thruster, PPT I APPT, transient plume, Lagmuir probes, time-of flight (ToF), nanosatellites
La teoria della governmentality nella dimensione del social and environmental accounting research
Creators: name: Burgia, Iris
Publisher: name: ----
Year: 2020
Subjects: governmentality, literature review, social and environmental accounting

description: L’articolo si rivolge agli studiosi di social and environmental accounting research presentando lo stato dell’arte e l’uso della teoria definita “governmentality” nel contesto del social and environmental accounting research. La scelta metodologica per l’analisi si basa sullo studio di Contrafatto (2011) utilizzando sei aree per l’analisi della letteratura: topic of research, regimes of practices, problematization, domanda di ricerca, metodologia e metodi applicati, conclusioni. Le conclusioni e le riflessioni emerse considerano l’interdisciplinarietà dei concetti teorici applicati per la comprensione dei fenomeni e gli aspetti olistici applicabili all’analisi dei fenomeni all’interno del processo di governing. Il contributo è suddiviso in tre sezioni principali. La prima introduce il framework della governmentality e cenni storici per la presentazione della teoria. Nella seconda sezione vengono classificati i contributi per la letteratura e i metodi applicati per la loro analisi. Nella terza sezione si discute sul ruolo della prospettiva della governmentality per la comprensione e l’analisi dei fenomeni nei contesti economico aziendali. L’articolo termina con le conclusioni e le riflessioni finali.
description: ----, Vol 11, No 3 (2020): ISSUE 3/2020
Assessment of the CZ-6A RB and the H-2A DEB fragmentation events
Creators: name:  MARCO FELICE MONTARULI
name:   SERGIO BONACCORSI
name:   ANDREA MUCIACCIA
name:   LORENZO GIUDICI
name:   PIERLUIGI DI LIZIA
name:   CAMILLA COLOMBO
name:   GIUSEPPE PARITI
name:   DAMIANO ERRICO
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: FRAGMENTATIONS
SPACE SURVEILLANCE AND TRACKING
CONJUNCTION ANALYSIS
KESSLER SYNDROME
SPACE DEBRIS

description: In the last decades, several Space Surveillance and Tracking (SST) related initiatives have been promoted to tackle the problem of the resident space objects overpopulation and, in particular, of the so-called space debris. Within this framework, the Fragmentation Analysis service of the European SST (EUSST) consortium is managed by the Italian Space Surveillance and Tracking Operation Center (!SOC) -Situational Awareness Centre (CSSA). This work presents the analyses carried out by Politecnico di Milano and !SOC-CS SA, regarding two fragmentations occurred on November 12th and November 17th , 2022, which involved the objects CZ-6A R/B and H-2A DEB respectively.
Ethylene oxide and Acetaldehyde in hot cores
Creators: name: Occhiogrosso, A.
name: Vasyunin, A.
name: Herbst, E.
name: Viti, S.
name: Ward, M. D.
name: Price, S. D.
name: Brown, W. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: [Abridged] Ethylene oxide and its isomer acetaldehyde are important complex organic molecules because of their potential role in the formation of amino acids. Despite the fact that acetaldehyde is ubiquitous in the interstellar medium, ethylene oxide has not yet been detected in cold sources. We aim to understand the chemistry of the formation and loss of ethylene oxide in hot and cold interstellar objects (i) by including in a revised gas-grain network some recent experimental results on grain surfaces and (ii) by comparison with the chemical behaviour of its isomer, acetaldehyde. We test the code for the case of a hot core. The model allows us to predict the gaseous and solid ethylene oxide abundances during a cooling-down phase prior to star formation and during the subsequent warm-up phase. We can therefore predict at what temperatures ethylene oxide forms on grain surfaces and at what temperature it starts to desorb into the gas phase. The model reproduces the observed gaseous abundances of ethylene oxide and acetaldehyde towards high-mass star-forming regions. In addition, our results show that ethylene oxide may be present in outer and cooler regions of hot cores where its isomer has already been detected. Despite their different chemical structures, the chemistry of ethylene oxide is coupled to that of acetaldehyde, suggesting that acetaldehyde may be used as a tracer for ethylene oxide towards cold cores.
description: 11 pages, 5 figures. Accepted by A&A
Toward an Illustrated Understanding of Art Therapy for ADHD: A Creative Inquiry Using Scoping Review, Autoethnography, and Visual Methods
Creators: Godel, Stephanie
Publisher: name: University of Alberta Library
Year: 2022

Affecting at least 5% of youth and 2.5% of adults worldwide, ADHD is associated with considerable suffering. Art therapists must therefore know how best to support clients of all ages who live with this neurodevelopmental disorder. Unfortunately, literature describing or evaluating art therapy for this population is sparse and typically produced by scholars who do not have ADHD themselves. This qualitative inquiry thus addressed the question: How does an illustrated description of research about art therapy for ADHD, incorporating the researcher’s firsthand experience of the disorder, illuminate possibilities and guide future inquiry in this area? To this end, I combined scoping review, autoethnography, and visual methods in an arts-based bricolage inspired by and aspiring toward research-creation. I sought English-language articles, books, chapters, and student works released between 1990 and 2020 which explicitly describe art therapy for people with ADHD. Descriptive numerical analysis shows that the collected sources are characterized by limited access, recency, and continuity, as well as citation distortions. Creative qualitative analysis using mixed-media visual methods including altered books and collage identified three clinical consensus themes: framework for freedom, practising success, and accounting for symptoms. Other key themes relate to research quality and assessments. This thesis tells the story of its own creation, punctuated and interrupted by autoethnographic texts and images reflecting my struggle through a degree which I am less likely to complete than are my typically developing peers. The work offers an evocative personal narrative, a multi-modal illustration of the existing literature, and recommendations for future study.
Single- and two-qubit quantum gates using superimposed optical lattice potentials
Creators: name: Jørgensen, Nils B.
name: Bason, Mark G.
name: Sherson, Jacob F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Steps towards implementing a collision based two-qubit gate in optical lattices have previously been realized by the parallel merging all pairs of atoms in a periodicity two superlattice. In contrast, we propose an architecture which allows for the merger of a selected qubit pair in a novel long-periodicity superlattice structure consisting of two optical lattices with close-lying periodicity. We numerically optimize the gate time and fidelity, including the effects on neighboring atoms, and in the presence of experimental sources of error. Furthermore, the superlattice architecture induces a differential hyperfine shift, allowing for single-qubit gates. The fastest possible single-qubit gate times, given a maximal tolerable rotation error on the remaining atoms at various values of the lattice wavelengths, are identified. We find that robust single- and two-qubit gates with gate times of a few 100~$μ$s and with error probabilities $\sim{}10^{-3}$ are possible.
description: 7 pages, 5 figures. Accepted in Physical Review A
Teaching Intercultural Understanding in Australian International Baccalaureate (IB) primary schools
Creators: name: ZENG, SHAORU
Publisher: name: Monash University
Year: 2022
Subjects: Other education not elsewhere classified

description: This thesis explores the implementation and challenges for teachers teaching Intercultural Understanding through International Baccalaureate Primary Year Programme. A convergent mixed method approach was used in this study, it involves a content analysis of key IB documents (n=8), PYP school guide (n=1), teachers’ lesson plans (n=6), a Qualtrics questionnaire in IBPYP schools world-wide (n=226), and a case study in an Australian IBPYP school with teacher interviews (n=6) to provide a comprehensive analysis. The resultant findings are relevant for informing the practice of in-service teachers, pre-service teachers, and initial teacher education, as well as school leaders and curriculum and policy developers.
La valutazione degli strumenti finanziari derivati al fair value e la convergenza della normativa italiana verso i principi contabili IAS/IFRS: un’analisi empirica
Creators: name: Amelio, Stefano
name: Salis, Giacobbe
Publisher: name: ----
Year: 2020
Subjects: Direttiva 2013/34/UE; d.lgs. 139/2015; fair value; IAS/IFRS; strumenti finanziari derivati

description: Il recepimento della Direttiva 2013/34/UE nell’ordinamento italiano ha generato un forte allineamento del bilancio redatto secondo le regole del Codice Civile e i principi contabili OIC rispetto a quello redatto secondo i principi contabili internazionali IAS/IFRS. Il presente paper effettua un’analisi empirica sull’impatto in bilancio della contabilizzazione degli strumenti finanziari derivati. Gli obiettivi dell’analisi sono molteplici: consentire di capire il grado di diffusione nei bilanci del possesso di tali strumenti finanziari; analizzare l’impatto della contabilizzazione sulla situazione patrimoniale e finanziaria dell’impresa; comprendere se il possesso di tali strumenti può avere un’influenza significativa in bilancio a livello economico e patrimoniale e se quindi il beneficio che ne trae l’informativa verso i terzi supera i maggiori oneri amministrativi che gravano sull’impresa; verificare se le imprese espongono in modo trasparente in nota integrativa tutte le informazioni richieste dalla normativa e dai principi contabili di riferimento in merito al possesso di strumenti finanziari derivati. I risultati dimostrano che i derivati possono generare effetti anche significativi nella struttura patrimoniale e finanziaria dell’impresa e pertanto, le scelte compiute dal legislatore sono condivisibili.
description: ----, Vol 11, No 3 (2020): ISSUE 3/2020
A holistic platform utilizing SDR for aiding automated airport and waterdrome inspections that utilize drones.
Creators: name:  NIKOLAOS ASTYRAKAKIS
name:   PAPATSAROUCHA DIMITRA
name:   PITYANOU KONSTANTINA
name:   MARKAKIS EVANGELOS
name:   ZOTOS NIKOLAOS
name:   GEORGIOS ALEXIOU
name:   MARINOS KARDARIS
name:   GEORGE BOGDOS
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: UAV
DRONES
SDR
MRNAV
NAVAIDS
FLYING PLATFORM
HORIZON 2020
AEROSAFE

description: Before landings and take-offs, airports and waterdromes require manual labour to complete necessary inspections and ground operations. The 5D-AeroSafe Horizon 20201 project has endeavoured to eliminate such manual processes while improving speed and efficiency of operations and security and safety levels. This paper describes a system named mRNAV, which is the combination of miniaturised unmanned aerial system transceivers mounted on a drone, to assist automated airport Navigation Aid Systems inspections and calibration by employing technologies such as Software Defined Radio and embedded sensors. Finally, utilising cloud infrastructures and a mobile link, inspection data are transported, analysed, and displayed in real time via a web user interface.
Strongly polynomial sequences as interpretations
Creators: name: Goodall, Andrew
name: Nesetril, Jaroslav
name: de Mendez, Patrice Ossona
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C31, 05C60, 03C13, 03C98

description: A strongly polynomial sequence of graphs $(G_n)$ is a sequence $(G_n)_{n\in\mathbb{N}}$ of finite graphs such that, for every graph $F$, the number of homomorphisms from $F$ to $G_n$ is a fixed polynomial function of $n$ (depending on $F$). For example, $(K_n)$ is strongly polynomial since the number of homomorphisms from $F$ to $K_n$ is the chromatic polynomial of $F$ evaluated at $n$. In earlier work of de la Harpe and Jaeger, and more recently of Averbouch, Garijo, Godlin, Goodall, Makowsky, Nešetřil, Tittmann, Zilber and others, various examples of strongly polynomial sequences and constructions for families of such sequences have been found. We give a new model-theoretic method of constructing strongly polynomial sequences of graphs that uses interpretation schemes of graphs in more general relational structures. This surprisingly easy yet general method encompasses all previous constructions and produces many more. We conjecture that, under mild assumptions, all strongly polynomial sequences of graphs can be produced by the general method of quantifier-free interpretation of graphs in certain basic relational structures (essentially disjoint unions of transitive tournaments with added unary relations). We verify this conjecture for strongly polynomial sequences of graphs with uniformly bounded degree.
description: 21 pages, 2 figures