cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Πρώιμη παρέμβαση σε παιδιά με αναπτυξιακές διαταραχές: ένα μανιφέστο της ομάδας εργασίας Eurlyaid
Creators: name: Moor, J. M.
name: Τζουριάδου, Μαρία
name: Waesberghe, B. T.
name: Κοντοπούλου, Μελανθία
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: Learning disabilities refer to a subgroup of normal or high intelligence children, showing, however, low school performance. On the basis of the cognitive approach of problem solving and information integrating those children show no deficiencies as far as the cognitive components are concerned. On the contrary, these children display certain difficulties in learning tasks, i.e. in cognitive skills. Children with learning disabilities, therefore, obviously show cognitive strategies problems; thus, they become unable to achieve the expert's level of thinking. On the additional basis of their personality features related to the etiology of the minimal brain dysfunction, these children seem to linger in restricted knowledge, i.e. they proceed from the knowledge algorithm to the specific knowledge task. This is the reason that may also explain their differention in learning tasks. In other words, they employ the process of try, feedback, rejection of old components and addition of new ones until the desired result is reached. Their difficulty can be detected in the process of achievement when, after the feedback they reject the old components and add new ones. Such strategies may be activated through the child's every day experiences and also through recent specific training - educational programmes.
description: Παιδαγωγική Επιθεώρηση, Vol. 23 (1996)
Techno-economic assessment of high variable renewable energy penetration in the Bolivian interconnected electric system
Creators: name: Rojas Candia, Ray Antonio
name: Balderrama Subieta, Sergio Luis
name: Araoz Ramos, Joseph Adhemar
name: Senosiain Miquélez, Vicente
name: Peña Balderrama, Jenny Gabriela
name: Jaldín Florero, Hernan
name: Quoilin, Sylvain
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: Bolivia plans significant investments in conventional and renewable energy projects before 2025. Deployment of large hydro-power, wind and solar projects are foreseen in the investment agenda. However and despite the large renewable potential in the country non-conventional renewable technologies are not yet considered to be a main source in the supply chain. The aim of this article is to evaluate the flexibility of the Bolivian power generation system in terms of energy balancing, electricity generation costs and power plants scheduling in a scenario that considers large solar and wind energy technology deployment. This is done using an open source unit commitment and optimal dispatch model (Dispa-SET) developed by the Joint Research Center of the European Commission. National data for existing infrastructure, committed and planned energy projects are used to assess the case of Bolivia. The base scenario consider all techno-economic data of the Bolivian power system up to 2016. A harmonized dataset is gathered and released as open data to allow other researchers to run and re-use the model. This model is then used to simulate scenarios with different levels of solar and wind energy deployment. Results from the analysis show that an energy mix with participation of solar and wind technology with values lower than 30% is technically feasible and indicates that further grid reinforcements are required.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
A Projected Upper Bound for Mining High Utility Patterns from Interval-Based Event Sequences
Creators: name: Mirbagheri, S. Mohammad
Publisher: name: arXiv
Year: 2022
Subjects: subject: Databases (cs.DB)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: High utility pattern mining is an interesting yet challenging problem. The intrinsic computational cost of the problem will impose further challenges if efficiency in addition to the efficacy of a solution is sought. Recently, this problem was studied on interval-based event sequences with a constraint on the length and size of the patterns. However, the proposed solution lacks adequate efficiency. To address this issue, we propose a projected upper bound on the utility of the patterns discovered from sequences of interval-based events. To show its effectiveness, the upper bound is utilized by a pruning strategy employed by the HUIPMiner algorithm. Experimental results show that the new upper bound improves HUIPMiner performance in terms of both execution time and memory usage.
Thermodynamic formalism for systems with Markov dynamics
Creators: name: Lecomte, Vivien
name: Appert-Rolland, Cécile
name: van Wijland, Frédéric
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The thermodynamic formalism allows one to access the chaotic properties of equilibrium and out-of-equilibrium systems, by deriving those from a dynamical partition function. The definition that has been given for this partition function within the framework of discrete time Markov chains was not suitable for continuous time Markov dynamics. Here we propose another interpretation of the definition that allows us to apply the thermodynamic formalism to continuous time. We also generalize the formalism --a dynamical Gibbs ensemble construction-- to a whole family of observables and their associated large deviation functions. This allows us to make the connection between the thermodynamic formalism and the observable involved in the much-studied fluctuation theorem. We illustrate our approach on various physical systems: random walks, exclusion processes, an Ising model and the contact process. In the latter cases, we identify a signature of the occurrence of dynamical phase transitions. We show that this signature can already be unravelled using the simplest dynamical ensemble one could define, based on the number of configuration changes a system has undergone over an asymptotically large time window.
description: 64 pages, LaTeX; version accepted for publication in Journal of Statistical Physics
Environmental migration: The connections between northern Senegal and Belgium
Creators: name: Lietaer, Samuel
Publisher: name: Zenodo
Year: 2021
Subjects: Remittances, translocal practices, migration, adaptation, environmental change, perceptions, Senegal, Belgium.

description: Policy recommendations for the MIGRADAPT-project, which is based on four-year qualitative translocal fieldwork evidence in Senegal and in Belgium.
Development in Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Creators: name: Teixeira, José Carlos Fernandes
name: Østergaard, Poul Alberg
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: The conference series International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems – abbreviated ECOS has been at the forefront of the scientific development in energy systems for over three decades. 2018 saw the 31st edition of ECOS held in Guimarães, Portugal. The venue received the contribution of over three hundred papers ranging over selected 19 topics, covering aspects related to thermodynamics, energy systems integration and optimization, planning, cogeneration of heat and power, environmental issues, amongst others. A number of the contributions were invited to the present special issue of the International Journal of Sustainable Energy Planning and Management, and eight of these were after the selection and reviewing process considered to bring the best contributions to the field. These articles address rural household appliance ownership, how much flexibility there is in the Bolivian electricity system to accommodate wind power and photo voltaics, national exergy analyses of Bolivia and thermal imagery of buildings to asses heat losses from these. Other work focus on polygeneration system combining renewable energy sources, cogeneration of heat, cooling and power to supply district heating and cooling in a case area in Italy. In the same area, a mobile thermal energy storage using phase change material is proposed as a way to connect heat sources and heat demands. For the future electrification of the transportation sector and for system design, reliable data on driving cycles are required thus methods for assessing these are presented, followed by analyses of high penetrations of electricity in the transportation system through various technological options.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Topological information device operating at the Landauer limit
Creators: name: Bozkurt, A. Mert
name: Brinkman, Alexander
name: Adagideli, İnanç
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose and theoretically investigate a novel Maxwell's demon implementation based on the spin-momentum locking property of topological matter. We use nuclear spins as a memory resource which provides the advantage of scalability. We show that this topological information device can ideally operate at the Landauer limit; the heat dissipation required to erase one bit of information stored in the demon's memory approaches $k_B T\ln2$. Furthermore, we demonstrate that all available energy, $k_B T\ln2$ per one bit of information, can be extracted in the form of electrical work. Finally, we find that the current-voltage characteristics of topological information device satisfy the conditions of an ideal memristor.
description: 7+5 pages, 2+2 Figures
Symmetric Orbifold Theories from Little String Residues
Creators: name: Hohenegger, Stefan
name: Iqbal, Amer
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a class of Little String Theories (LSTs) of A type, described by $N$ parallel M5-branes spread out on a circle and which in the low energy regime engineer supersymmetric gauge theories with $U(N)$ gauge group. The BPS states in this setting correspond to M2-branes stretched between the M5-branes. Generalising an observation made in arXiv:1706.04425, we provide evidence that the BPS counting functions of special subsectors of the latter exhibit a Hecke structure in the Nekrasov-Shatashvili (NS) limit, i.e. the different orders in an instanton expansion of the supersymmetric gauge theory are related through the action of Hecke operators. We extract $N$ distinct such reduced BPS counting functions from the full free energy of the LST with the help of contour integrals with respect to the gauge parameters of the $U(N)$ gauge group. Physically, the states captured by these functions correspond to configurations where the same number of M2-branes is stretched between some of these neighbouring M5-branes, while the remaining M5-branes are collapsed on top of each other and a particular singular contribution is extracted. The Hecke structures suggest that these BPS states form the spectra of symmetric orbifold CFTs. We furthermore show that to leading instanton order (in the NS-limit) the reduced BPS counting functions factorise into simpler building blocks. These building blocks are the expansion coefficients of the free energy for $N=1$ and the expansion of a particular function, which governs the counting of BPS states of a single M5-brane with single M2-branes ending on it on either side. To higher orders in the instanton expansion, we observe new elements appearing in this decomposition, whose coefficients are related through a holomorphic anomaly equation.
description: 74 pages
Βασικές λειτουργίες της εξέτασης με ανοικτά βιβλία στο πανεπιστημιακό επίπεδο
Creators: name: Θεοφιλίδης, Χρήστος
name: Διονυσίου, Ο.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: The study had a two-fold purpose; on the one hand, to identify the major functions of the open-book examination and, on the other hand, to examine whether those functions vary by student's anxiety level during the exam and expected graduation grade. All students who participated in an introductory course on education (N = 109) became the subjects of the study. The study was an ex post facto research design, utilizing a questionnaire. The major functions of the open-book examination were identified by factor analyzing 18 statements, using a principal components analysis with varimax rotation. The analysis yielded five factors accounting for 66,0 percent of the variance. Based on the factor loadings, the following functions were identified: retention of learning and transfer of knowledge, creative use of the knowledge gained, student self-evaluation and feedback, application of higher order thinking and reduction of the examination stress. When scale mean scores were computed for each of the five factors, it appeared that the mean values for the first four functions ranged between 3,67 and 4,15 on a 1-5 interval scale, whereas for the fifth factor the mean scale score was 3,10. Scale alpha reliability coefficients for the five factors ranged between 0,84 and 0,69. A t-test for independent samples indicated that student anxiety level and expected graduation grade did not differentiate in any way the five functions idendified.
description: Παιδαγωγική Επιθεώρηση, Vol. 23 (1996)
A 110 MG cyclotron harmonic in the optical spectrum of RX J1554.2+2721
Creators: name: Schwope, A. D.
name: Schreiber, M. R.
name: Szkody, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection of a 110 MG cyclotron harmonic in the SDSS-spectrum of the magnetic cataclysmic variable (MCV) RX J1554.2+2721. This feature was noted earlier by others but remained unexplained. The wide spectral coverage of the new spectrum together with the earlier detection of a Zeeman split Ly-a line in a field of 144 MG makes the identification almost unambiguous. We propose to explain the non-conforming UV-optical photospheric temperature of the white dwarf by an as yet unobserved cyclotron component in the ultraviolet which also could significantly contribute to the overall energy balance of the accretion process.
description: 4 pages, 3 figures, accepted for A&A
The physical meaning of the magnetic scalar potential, and how to use it to design an electromagnet
Creators: name: Crawford, C. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Classical Physics (physics.class-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The magnetic scalar potential can be used to design electromagnets accurately and efficiently. I will describe a practical construction algorithm: the prescribed field in a "Target" region (constrained only by Maxwell's equations) specifies boundary conditions which uniquely determine the potential in the surrounding field "Return" region. As required by the physical representation of the magnetic scalar potential, the conducting elements of the resulting coil are directed along equipotentials on the surface of each region, at equal increments of the potential. I give some examples and comments on the limits of precision of the constructed field.
description: 8 pages, 4 figures
Crypto-Hotwire: Illegal Blockchain Mining at Zero Cost Using Public Infrastructures
Creators: name: Coutinho, Felipe Ribas
name: Pires, Victor
name: Miceli, Claudio
name: Menasche, Daniel Sadoc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Blockchains and cryptocurrencies disrupted the conversion of energy into a medium of exchange. Numerous applications for blockchains and cryptocurrencies are now envisioned for purposes ranging from inventory control to banking applications. Naturally, in order to mine in an economically viable way, regions where energy is plentiful and cheap, e.g., close to hydroelectric plants, are sought. The possibility of converting energy into cash, however, also opens up opportunities for a new kind of cyber attack aimed at illegally mining cryptocurrencies by stealing energy. In this work, we indicate, using data from January and February of 2018 from our university, that such a threat is real, and present a projection of the gains derived from these attacks.
Deformation measurement of a soil mixing retaining wall using terrestrial laser scanning
Creators: name: Zhao, Yang
name: Fan, Lei
name: Seo, Hyungjoon
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Retaining walls are often built to prevent excessive lateral movements of the ground surrounding an excavation site. During an excavation, failure of retaining walls could cause catastrophic accidents and hence their lateral deformations are monitored regularly. Laser scanning can rapidly acquire the spatial data of a relatively large area at fine spatial resolutions, which is ideal for monitoring retaining walls' deformations. This paper attempts to apply laser scanning to measurements of the lateral deformations of a soil mixing retaining wall at an ongoing excavation site. Reference measurements by total station and inclinometer were also conducted to verify those from the laser scanning. The deformations derived using laser scanning data were consistent with the reference measurements at the top part of the retaining wall (i.e., mainly the ring beam of the wall). This research also shows that the multi-scale-model-to-model method was the most accurate deformation estimation method on the research data.
description: 22 pages
Heterogeneous Graph Neural Network for Recommendation
Creators: name: Shi, Jinghan
name: Ji, Houye
name: Shi, Chuan
name: Wang, Xiao
name: Zhang, Zhiqiang
name: Zhou, Jun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The prosperous development of e-commerce has spawned diverse recommendation systems. As a matter of fact, there exist rich and complex interactions among various types of nodes in real-world recommendation systems, which can be constructed as heterogeneous graphs. How learn representative node embedding is the basis and core of the personalized recommendation system. Meta-path is a widely used structure to capture the semantics beneath such interactions and show potential ability in improving node embedding. In this paper, we propose Heterogeneous Graph neural network for Recommendation (HGRec) which injects high-order semantic into node embedding via aggregating multi-hops meta-path based neighbors and fuses rich semantics via multiple meta-paths based on attention mechanism to get comprehensive node embedding. Experimental results demonstrate the importance of rich high-order semantics and also show the potentially good interpretability of HGRec.
LNOB / JEDI Workshop - Inclusie en diversiteit in Citizen Science
Creators: name: Gold, Margaret
Publisher: name: Zenodo
Year: 2024

description: This workshop at the SciVil 2024 Networking Day introduced the concepts of Justice, Equity, Diversity & Inclusion (JEDI) and Leave No One Behind (LNOB), and shared the invitation for Citizen Observatories in Belgium to join the CitiObs Alliance.
Design of a polygeneration system with optimal management for a dhc network
Creators: name: Lazzeroni, Paolo
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: Nowadays, District Heating and Cooling (DHC) networks represent a viable and efficient way to distribute energy for space heating and cooling in urban areas with high density demand. This is particularly true in a context characterized by higher fuel price and restrictive regulatory framework. DHC systems give the possibility to integrate energy sources available in the territory and supply thermal energy vector to a conveniently large number of end-users; these are thus potentially capable to cover the demand at lower costs, higher efficiency and reduced emissions compared to not centralized systems. In Europe, the Directive 2012/27/EU pointed out the need for these systems, introducing the definition of ‘efficient DHC’: at least 50% of renewable energy, 50% of waste heat, 75% of cogenerated heat or 50% of a combination of such energy and heat should be used. This paper presents the design assessment of the generation facilities for an existing DHC network located in the northern part of Italy. The design stage considers boiler, Combined Heat and Power (CHP), solar thermal, absorption/electric chiller and other low enthalpy sources as options of the case study. The sizes of the generation units are defined according to the heating/cooling demand of the buildings supplied by the DHC, the estimated network losses and the present regulatory framework. The plant management is identified through an optimization procedure capable to minimize the operational costs according to the technical characteristics and constraints of the plant. Four different configurations with increasing costs saving, installation costs, Renewable Energy Sources (RES) generation and Primary Energy Saving (PES) are presented. A preliminary economic evaluation is also presented for the various configurations considering the Italian incentive schemes. Finally, an energy assessment is presented to highlight the share of the different sources in each configuration and to evaluate their compliance to the EU Directive on efficient DHC .
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Quantum confinement effects in InAs-InP core-shell nanowires
Creators: name: Zanolli, Z
name: Pistol, M-E
name: Froeberg, L E
name: Samuelson, L
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the detection of quantum confinement in single InAs-InP core-shell nanowires. The wires having an InAs core with ~25 nm diameter are characterized by emission spectra in which two peaks are identified under high excitation intensity conditions. The peaks are caused by emission from the ground and excited quantized levels, due to the quantum confinement in the plane perpendicular to the nanowire axis. We have identified in the emission spectra different energy contributions related to the wurtzite structure of the wires, the strain between the wurtzite core and shell, and the confinement energy of the InAs core. Calculations based on 6-band strain-dependent k.p theory allow the theoretical estimation of the confined energy states in such materials and we found these results to be in good agreement with those from the photoluminescence studies.
description: 10 pages, 4 figures, accepted to Journal of Physics: Condensed Matter
Optimal designs for efficient mobility service for hybrid electric vehicles
Creators: name: Dimitrova, Zlatina Kirilova
name: Maréchal, François
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: The priority of the automotive industry is to reduce the energy consumption and the emissions of the future passenger cars and to deliver an efficient mobility service for the customers. The improvement of the efficiency of vehicle energy systems promotes an active search to find innovative solutions during the design process. Engineers can use computer-aided processes to find automatically the best design solutions. This kind of approach named “multi-objective optimization” is based on genetic algorithms. The idea is to obtain simultaneously a population of possible design solutions corresponding to the most efficient energy system definition for a vehicle. These solutions will be optimal from technical, economic and environmental point of view. The “genetic intelligence” is tested for the holistic design of the environomic vehicle powertrain solutions. The environomic methodology for design is applied on D-class hybrid electric vehicles, in order to explore the techno-economic and environmental trade-off for different hybridization level of the vehicles powertrains. The method gives also an overview of the evolution of environmental categories indicators as a function of the cost of the vehicles.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Assessing the reliability of the Raman peak counting method for the characterization of SWCNT diameter distributions: a cross-characterization with TEM
Creators: name: Castan, Alice
name: Forel, Salomé
name: Fossard, Frédéric
name: Defillet, Joeri
name: Ghedjatti, Ahmed
name: Levshov, Dmitry
name: Wenseleers, Wim
name: Cambré, Sofie
name: Loiseau, Annick
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Resonant Raman spectroscopy is a widely used technique for single-walled carbon nanotube (SWCNT) characterization, in particular in the radial breathing mode (RBM) range which provides direct information on the structure of the nanotube in resonance. The RBM peak counting method, i.e. acquiring Raman spectrum grids on a substrate with a select set of discrete laser lines and counting RBM peaks as single nanotubes, is frequently used to characterize SWCNT growth samples, despite the many factors that can induce errors in the results. In this work, we cross-characterize the diameter distributions obtained through this methodology with diameter distributions obtained by counting SWCNT diameters in transmission electron microscopy (TEM) and discuss the different results and biases between the techniques. This study is performed on a broad diameter distribution sample, and on two chirality-enriched samples whose chirality distributions are determined by photoluminescence excitation spectroscopy (PLE) and statistical analysis of high resolution TEM (HRTEM) images. We show that the largest differences between the Raman peak counting and TEM diameter distributions stem from the chirality-dependence of SWCNT Raman cross-sections and the patchy vision offered by the use of only a few discrete excitation wavelengths. The effect of the substrate and TEM-related biases are also discussed.
Techno-Economic Design and Social Integration of Mobile Thermal Energy Storage (M-TES) within the Tourism Industry
Creators: name: Bose, Archishman
name: Ahmed, Mohammad Samir
name: Kuzeva, Denitsa Dobrinova
name: Van Kasteren, Johannes
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: Industrial facilities including power plants are potential sources of cheap and low-carbon waste heat, which is often not utilized due to lack of techno-economically viable options. The present paper is based on a case study focussing at Albena tourist resort in Bulgaria to design and develop a potential Mobile Thermal Energy Storage (M-TES) system for waste heat utilization from an existing biogas-based combined heat and power (CHP) plant. Besides techno-economics, integration of the system within existing premises, freight weight, space constraint and hotel occupancy are crucial factors. Scheduling, along with the frequency of container change determines both the economic and social viability of such a project. A conceptual system design tailored to maximize energy utilization within the given constraints has been made. Core of the system is 5 containers of 15.9 tons each, with one pulling truck for minimal visibility of the transportation and a two-day container discharge cycle. A net reduction of 558 to 885 MWh per year of electricity consumption from existing electric boilers was calculated with a payback period of 7 to 14 years based on typical summer or yearly operation of hotels. The corresponding CO2 savings was 96.7%. Hybridization with Solar Thermal Systems can provide a complete substitution of the use of traditional energy sources for domestic hot water.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Miura-reciprocal transformations and localizable Poisson pencils
Creators: name: Lorenzoni, P.
name: Shadrin, S.
name: Vitolo, R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 37K05, 37K10, 37K20, 37K25

description: We show that the equivalence classes of deformations of localizable semisimple Poisson pencils of hydrodynamic type with respect to the action of the Miura-reciprocal group contain a local representative and are in one-to-one correspondence with the equivalence classes of deformations of local semisimple Poisson pencils of hydrodynamic type with respect to the action of the Miura group.
description: 27 pages
Time-scale dependence of solar wind-based regression models of ionospheric electrodynamics
Creators: name: Laundal, K. M.
name: Reistad, J. P.
name: Hatch, S. M.
name: Moretto, T.
name: Ohma, A.
name: Østgaard, N.
name: Tenfjord, P. A. R.
name: Finlay, C. C.
name: Kloss, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The solar wind influence on geospace can be described as the sum of a directly driven component, or dayside reconnection, and an unloading component, associated with the release of magnetic energy via nightside reconnection. The two processes are poorly correlated on short time scales, but exactly equal when averaged over long time windows. Because of this peculiar property, regression models of ionospheric electrodynamics that are based on solar wind data are time scale specific: Models derived from 1 min resolution data will be different from models derived from hourly, daily, or monthly data. We explain and quantify this effect on simple linear regression models of various geomagnetic indices. We also derive a time scale-dependent correction factor that can be used with the Average Magnetic field and Polar current System model. Finally, we show how absolute estimates of the nightside reconnection rate can be calculated from solar wind measurements and geomagnetic indices.
Comparison of driving cycles obtained by the Micro-trips, Markov-chains and MWD-CP methods
Creators: name: Huertas, José Ignacio
name: Quirama, Luis Felipe
name: Giraldo, Michael Daniel
name: Diaz, Jenny
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: This work compared the Micro-trips, Markov-chains and the MWD-CP methods in their ability of constructing driving cycles (DCs) that represent local driving patterns. For this purpose, we used a database made of 138 time series of speed obtained monitoring during two months a fleet of 15 transit buses operating on roads with different levels of service, traffic and road grades, under normal conditions of use. Then, we used 16 characteristic parameters, such as mean speed or positive kinetic energy, to describe the driving pattern of the buses’ drivers monitored. Subsequently, we implemented three of the most widely used methods to construct DCs using this common database as input data. Finally, we evaluated the degree of representativeness of the local driving pattern contained in each of the obtained DCs. Toward that end we defined that a DC represents a driving pattern when its characteristic parameters are equal to the characteristic parameter of the driving pattern. Therefore, we used as criteria of representativeness the relative differences between paired characteristic parameters, and observed that the MWD-CP method produced the DC that best represents the driving pattern in the region where the buses were monitored, followed by the DC produced by the Micro-trips method.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Alternative description of the 2D Blume-Capel model using Grassmann algebra
Creators: name: Clusel, Maxime
name: Fortin, Jean-Yves
name: Plechko, Vladimir N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We use Grassmann algebra to study the phase transition in the two-dimensional ferromagnetic Blume-Capel model from a fermionic point of view. This model presents a phase diagram with a second order critical line which becomes first order through a tricritical point, and was used to model the phase transition in specific magnetic materials and liquid mixtures of He$^3$-He$^4$. In particular, we are able to map the spin-1 system of the BC model onto an effective fermionic action from which we obtain the exact mass of the theory, the condition of vanishing mass defines the critical line. This effective action is actually an extension of the free fermion Ising action with an additional quartic interaction term. The effect of this term is merely to render the excitation spectrum of the fermions unstable at the tricritical point. The results are compared with recent numerical Monte-Carlo simulations.
description: 32 pages, 2 figures;
DNA looping: the consequences and its control
Creators: name: Saiz, Leonor
name: Vilar, Jose M. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The formation of DNA loops by proteins and protein complexes is ubiquitous to many fundamental cellular processes, including transcription, recombination, and replication. Here we review recent advances in understanding the properties of DNA looping in its natural context and how they propagate to the cellular behavior through gene regulation. The results of connecting the molecular properties with cellular physiology indicate that looping of DNA in vivo is much more complex and easier than predicted from current models and reveals a wealth of previously unappreciated details.
Robustness of flat bands on the perturbed Kagome and the perturbed Super-Kagome lattice
Creators: name: Kerner, Joachim
name: Täufer, Matthias
name: Wintermayr, Jens
Publisher: name: arXiv
Year: 2023
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 05C90, 58J50, 81Q35, 92E10

description: We study spectral properties of perturbed discrete Laplacians on two-dimensional Archimedean tilings. The perturbation manifests itself in the introduction of non-trivial edge weights. We focus on the two lattices on which the unperturbed Laplacian exhibits flat bands, namely the $(3.6)^2$ Kagome lattice and the $(3.12)^2$ ``Super-Kagome'' lattice. We characterize all possible choices for edge weights which lead to flat bands. Furthermore, we discuss spectral consequences such as the emergence of new band gaps. Among our main findings is that flat bands are robust under physically reasonable assumptions on the perturbation and we completely describe the perturbation-spectrum phase diagram. The two flat bands in the Super-Kagome lattice are shown to even exhibit an ``all-or-nothing'' phenomenon in the sense that there is no perturbation which can destroy only one flat band while preserving the other.
description: 19 pages, 6 figures
Modelling of rural electrical appliances saturation in developing countries to project their electricity demand: A case study of sub-Saharan Africa
Creators: name: Dominguez, Cristina
name: Orehounig, Kristina
name: Carmeliet, Jan
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: Rural electrification projects are mostly listed as a priority in developing countries due to the numerous benefits it brings to improve people’s quality of life. The starting point for these projects is the accurate estimation of the households’ energy demand, but the large amount of resources that requires the on-site data collection makes this process unattractive to investors. This paper brings a potential solution to that matter, presenting a methodology for modelling the appliances saturation of rural households in developing countries to project their electricity demand. Based on a statistical approach, and including training data from more than 1,100 household samples from Nigeria and Ethiopia, the correlation between household survey data of saturation rates of the most common electricity-consuming appliances in developing countries and different socio-economic, demographic and geographic variables are investigated. Its accuracy is tested using other sets of validation data at a household, state, and national level. Finally, the results are projected using a Geographic Information Systems approach for identifying possible sites to be electrified. The high potential of using this approach for projecting the appliances saturation rates for rural areas was proven by obtaining a good overall accuracy in the results. As expected, the errors obtained at a household level were bigger than at a state or national level, these deviations are attributed to the presence of outliers due to the human behaviour incidence at household scale; which also affects the correlation patterns between the appliances ownership and evident socioeconomic factors.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Παράγοντες που επηρεάζουν την επιλογή επαγγέλματος των νέων
Creators: name: Γουδήρας, Δημήτρης Β.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: Die Berufswahl ist heute ein der hauptsächlichen Probleme der aktuellen Jugend. Die Adolesqenz wird als Stadium des Übergangs von der Unreifung zur Mündigkeit und von der Familie und der Schule zur Beschäftigung verstanden. Deshalb hängt der Schulbesuch mit der Berufswahl, der sozialen Plazierung und dem individuellen Einstieg zusammen. Die Faktoren, die auf die Berufswahl stark einwirken, sind biologisch, psychologisch und sozial-ökonomisch. Die hauptsächlichen davon sind - außer des Schulbesuchs - das Geschlecht, die soziale Herkunft und der Schulbesuch. Die traditionellen Stereotypen für die Geschlechterrollen, die soziale Herkunft und der Wohnort beeinflussen entscheident die Berufswahl so wohl der Frauen wie auch der Männer. Die Organisation und Funklion des griechischen Schulwesens läßt den staatlichen Schulen kaum Raum frei um sie auf die Berufswahl der Frauen und der Männer emanzipatorisch und entscheident auszuwirken wegen des mangelhaften Einsatzes der Schulberatung, nicht zuletzt auch wegen der Unterschatzung der beruflichen Qualifikation in der Ausbildung.
description: Παιδαγωγική Επιθεώρηση, Vol. 23 (1996)
A Faint, Steep Spectum Burst from the Radio Transient GCRT J1745-3009
Creators: name: Hyman, Scott D.
name: Roy, Subhashis
name: Pal, Sabyasachi
name: Lazio, T. Joseph W.
name: Ray, Paul S.
name: Kassim, Namir E.
name: Bhatnagar, Sanjay
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: GCRT J1745-3009 is a transient bursting radio source located in the direction of the Galactic center. It was discovered in a 330 MHz VLA observation from 2002 September 30--October 1 and subsequently rediscovered in a 330 MHz GMRT observation from 2003 September 28 by Hyman et al. Here we report a new radio detection of the source in 330 MHz GMRT data taken on 2004 March 20. The observed properties of the single burst detected differ significantly from those measured previously, suggesting that GCRT J1745-3009 was detected in a new physical state. The 2004 flux density was ~0.05 Jy, ~10x weaker than the single 2003 burst and ~30x weaker than the five bursts detected in 2002. We derive a very steep spectral index, alpha = -13.5 +/- 3.0, across the bandpass, a new result previously not detectable due to limitations in the analysis of the 2002 and 2003 observations. Also, the burst was detected for only ~2 min., in contrast to the 10 min. duration observed in the earlier bursts. Due to sparse sampling, only the single burst was detected in 2004, as in the 2003 epoch, and we cannot rule out additional undetected bursts that may have occurred with the same ~77 min. periodicity observed in 2002 or with a different periodicity. Considering our total time on source throughout both our archival and active monitoring campaigns, we estimate the source exhibits detectable bursting activity ~7% of the time.
description: 11 pages including 2 figures; submitted to ApJ Letters
Modelling the spatial energy diversity in sub-city areas using remote sensors
Creators: name: Urquizo, Javier
name: Calderón, Carlos
name: James, Philip
Publisher: name: International Journal of Sustainable Energy Planning and Management
Year: 2019

description: This research paper aims first to present in a digital map a class information about surface temperature in domestic buildings by means of thermal imagery. The classes are relative to the particular temperature distribution and for the particular night of the survey. Classification assigns every pixel into one of five classes based on where the pixel falls in the histogram, into an integer between 1 and 5, with 1 representing being the “coolest” pixels and 5 being the “hottest” resolution, based on a case study acquired over Newcastle upon Tyne (United Kingdom). The ultimate aim is combine this information with building level data set for Newcastle and adds on the energy modelling aspect through linking with the English House Survey (EHS) as input to the Cambridge Housing Model (CHM). This provides the means to produce building level energy use estimates and surface temperature, which in turn can be analysed both spatially and aspatially. This building level approach provides the potential for energy planners and other bodies to model energy interventions measures with flexibility in scale and to potentially adapt plans to the spatial variability of the local area characteristics.
description: International Journal of Sustainable Energy Planning and Management, Vol 22 (2019)
Reply to "Comment on `Measurability of nonequilibrium thermodynamics in terms of the Hamiltonian of mean force'"
Creators: name: Strasberg, Philipp
name: Esposito, Massimiliano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We refute the criticism expressed in a comment by P. Talkner and P. Hänggi [Phys. Rev. E 102, 066101 (2020)] on our paper Phys. Rev. E 101, 050101(R) (2020). We first make clear that our paper is free of any technical mistakes. We then defend the statements of our manuscript which were claimed to be taken out of context. Finally, we give clear arguments showing that the basic concepts we rely on are meaningful and have a deep rational.
description: 1.5 pages
Far-infrared magneto-conductivity of a YBa₂Cu₃O₇₋₈ superconducting thin film
Creators: name: Matz, Daniel Johann
Publisher: name: University of British Columbia
Year: 2009

description: The far-infrared reflectivity of a superconducting film of YBa₂Cu₃O₇₋₈ has been measured in a magnetic field up to 3.5 T. From this a Kramers-Kronig analysis has yielded the magneto-optic conductivity. In fitting these results to a theoretical model involving vortex core motion it was possible to fit the shape but not the magnitude of the frequency-dependent conductivity.
Anisotropy and Penetration Depth of MgB$_{2}$ from ${}^{11}$B NMR
Creators: name: Chen, Bo
name: Sengupta, Pratim
name: Halperin, W. P.
name: Sigmund, E. E.
name: Mitrovic, V. F.
name: Lee, M. H.
name: Kang, K. H.
name: Mean, B. J.
name: Kim, J. Y.
name: Cho, B. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The ${}^{11}$B NMR spectra in polycrystalline MgB$_2$ were measured for several magnetic fields (1.97 T and 3.15 T) as a function of temperature from 5 K to 40 K. The composite spectra in the superconducting state can be understood in terms of anisotropy of the upper critical field, $γ_{H}$, which is determined to be 5.4 at low temperature. Using Brandt's algorithm\cite{Brandt} the full spectrum, including satellites, was simulated for the temperature 8 K and a magnetic field of 1.97 T. The penetration depth $λ$ was determined to be $1,152\pm50$ Å, and the anisotropy of the penetration depth, $γ_λ$, was estimated to be close to one at low temperature. Therefore, our findings establish that there are two different anisotropies for upper critical field and penetration depth at low temperatures.
description: 10 pages, 7 figures
Η σχεδογραφία του 12ου αιώνα. Ανέκδοτα κείμενα από τον κώδικα Vaticanus Palatinus Gr. 92
Creators: name: Gerez Sanchez, Gonzalo Louis Miguel
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Σχεδογραφία
Βυζαντινή Εκπαίδευση
Ελληνική γλώσσα
Schedographia
Byzantine Education
Greek Language

description: Η λεγόμενη σχεδογραφία είναι ένα είδος γλωσσικής άσκησης που αξιοποιήθηκε στο Βυζάντιο και είχε θαυμαστές αλλά παράλληλα και μισητές, όταν η χρήση του έγινε κατά κόρον. Επειδή αυτές οι ασκήσεις έχουν διασωθεί μέχρι σ' εμάς σε διάφορες συλλογές, ανέκδοτες τις περισσότερες φορές, στη διπλωματική μας εργασία θελήσαμε να συγκεντρώσουμε έναν αρκετό μεγάλο όγκο τέτοιου είδους ασκήσεων προκειμένου να διερευνήσουμε αυτό το πεδίο της Βυζαντινής εκπαίδευσης. Στην εργασία μας παρουσιάζουμε 53 κριτικώς εκδιδόμενα ανέκδοτα κείμενα από τον κώδικα Vaticanus Palatinus Gr. 92 με εισαγωγή όπου θίξαμε μερικά παρεμφερή ζητήματα όπως λεξικογραφία και εκπαίδευση και συμπεράσματα όπου προτείνουμε νέες προοπτικές στον τομέα της σχεδογραφίας
description: The so-called schedographia is a kind of linguistic training which was used in Byzantium and had so much lovers as haters, when its use was abusive. Because these exercises have been preserved up to us by means of various, inedit the most times, collections, in our work, we seeked to gather a sufficient large amount of such exercises in order to research this field of the Byzantine education. In our study we present 53 so far inedit texts in critical edition from the manuscript Vaticanus Palatinus Gr. 92 with an introduction where we deal with some other related questions, as lexicography and education, as well as conclusions where we propose new prospectives in the field of schedographia.
Optimized time-lapse acquisition design via spectral gap ratio minimization
Creators: name: Zhang, Yijun
name: Yin, Ziyi
name: Lopez, Oscar
name: Siahkoohi, Ali
name: Louboutin, Mathias
name: Kumar, Rajiv
name: Herrmann, Felix J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Modern-day reservoir management and monitoring of geological carbon storage increasingly call for costly time-lapse seismic data collection. In this letter, we show how techniques from graph theory can be used to optimize acquisition geometries for low-cost sparse 4D seismic. Based on midpoint-offset domain connectivity arguments, the proposed algorithm automatically produces sparse non-replicated time-lapse acquisition geometries that favor wavefield recovery.