cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Using inverse kinematics to position articulated figures
Creators: name: Kuder, Karen Cynthia
Publisher: name: University of British Columbia
Year: 2009

description: Computer-assisted animation is an active research area in computer graphics. Within this field, many systems are being developed that allow traditional animators to utilize computers in the animation process. The ability to position articulated figures is of particular interest. A method called inverse kinematics allows the user to position a figure by specifying a desired goal location for a particular segment of the figure. An algorithm is employed to compute the required changes to the joint angles of the figure in order to move the segment to the desired location. This thesis describes an experiment that was conducted to compare three different inverse kinematic methods: the Jacobian method, the C C D method and the 1DOF method. Subjects used the methods to manipulate the pose of a given articulated figure in an attempt to match a specified goal pose. Results from the experiment indicate that overall, the 1DOF method produced the best matches (in terms of speed and accuracy). However, no single method had superior performance for all of the positioning tasks that were studied. Consequently, an animation system should offer the user the choice of at least two of the positioning methods.
Teachers' perspectives on mathematics education research reports
Creators: name: Groth, Randall E.
name: Bergner, Jennifer A.
Publisher: name: Maryland Shared Open Access Repository
Year: 2007
Subjects: mathematics education
teacher education
research–practice relationship
teacher beliefs

description: Practicing teachers’ perspectives on a set of mathematics education research reports are described. Data were gathered through e-mail messages, group discussions, and questionnaires. Teachers identified positive influences of research on practice aligned with some of the strands of proficient mathematics teaching identified by Kilpatrick, Swafford, and Findell (2001). Teachers also gave negative critiques of the ability of research to influence practice aligned with Kennedy’s (1997) discussion of historical factors underlying the gap between educational research and practice. The variety of perspectives documented provides some empirical ground for informing actions in the areas of teacher education and research.
From Context-Free to Aggregate Universality: Life Skills Courses and The Making of Automated Therapy in Bengaluru, India
Creators: name: Lang, Claudia
name: Sathaye, Sonali
Publisher: name: Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology
Year: 2024

description: This paper uses life-skills training courses and an automated therapeutic self-help app from Bengaluru, India, as lenses through which to investigate universalizing processes of psychology and therapy and some of its frictions. How is psychological universality achieved in these courses and in the app, and in so far as context comes to matter, how does it do so? We show that, in the case of the courses, universality is assumed to be bounded and context-free, while in the case of the app it is ‘aggregated’. Thus, the different ways in which achieving the universal is aspired to in these two cases is linked to a shift in the meaning of ‘context, which is bracketed in the first case and operationalized in the second. In the former, it is a cultural feature to be silenced or reduced; in the latter, it is the generative material of the aggregate universal itself. While in life-skills training courses universality is assumed to be free of context, automated therapy is pragmatic and assembles context to generate what we call ‘aggregated universality’.
description: Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology, Bd. 149 Nr. 1 (2024): Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology
Rate Allocation Algorithm with Successive Refinement in Peer-to-Peer Netoworks
Creators: name: Lu, Mi
Publisher: name: figshare
Year: 2021
Subjects: subject: 100503 Computer Communications Networks
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We introduce a new across-peer rate allocation algorithm with successive refinement to improve the video transmission performance in P2P networks, based on the combination of multiple description coding and network coding. Successive refinement is implemented through layered multiple description codes. The algorithm is developed to maximize the expected video quality at the receivers by partitioning video bitstream into different descriptions depending on different bandwidth conditions of each peer. Adaptive rate partition adjustment is applied to ensure the real reflection of the packet drop rate in the network. Also the granularity is changed to the scale of atomic blocks instead of stream rates in prior works. Through simulation results we show that the algorithm outperforms prior algorithms in terms of video playback quality at the peer ends, and helps the system more adjustable to the peer dynamics.
Effect of pressure on the phase behavior and structure of water confined between nanoscale hydrophobic and hydrophilic plates
Creators: name: Giovambattista, Nicolas
name: Rossky, Peter J.
name: Debenedetti, Pablo G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We perform systematic molecular dynamics simulations of water confined between two nanoscale plates at T=300 K. We investigate the effect of pressure (-0.15 GPa <= P <= 0.2 GPa) and plate separation (0.4 nm <= d <= 1.6 nm) on the phase behavior of water when the plates are either hydrophobic or hydrophilic. When water is confined between hydrophobic plates, capillary evaporation occurs between the plates at low enough P. The threshold value of d at which this transition occurs decreases with P (e.g., 1.6 nm at P ~ -0.05 GPa; 0.5 nm at P \~ 0.1 GPa), until, at high P, no capillary evaporation occurs. For d ~ 0.6 nm and P >= 0.1 GPa, the system crystallizes into a bilayer ice. A P-d phase diagram showing the vapor, liquid, and bilayer ice phases is proposed. When water is confined by hydrophilic (hydroxylated silica) plates, it remains in the liquid phase at all P and d studied. Interestingly, we observe, for this case, that even at the P at which bulk water cavitates, the confined water remains in the liquid state. We also study systematically the state of hydration at different P for both kinds of plates. For the range of conditions studied here, we find that in the presence of hydrophobic plates the effect of P is to enhance water structure and to push water molecules toward the plates. The average orientation of water molecules next to the hydrophobic plates does not change upon pressurization. In contrast, in the presence of hydrophilic plates, water structure is insensitive to P. Hence, our results suggest that upon pressurization, hydrophobic plates behave as `soft' surfaces (in the sense of accommodating pressure-dependent changes in water structure) while hydrophilic walls behave as `hard' surfaces.
description: accepted for publication in Phys. Rev. E. Figs. 1, 3, 4, and 6 are in low resolution to avoid large fig. files
«Lacune» e selezioni mitiche: Luc. DMar. 3 («Poseidone e Alfeo»)
Creators: name: Floridi, Lucia
Publisher: name: ACME
Year: 2019

description: L’articolo intende chiarire le strategie selettive adottate da Luciano nella sua rivisitazione del mito di Alfeo e Aretusa in DMar. 3 e precisare il valore delle assenze: alcuni dettagli della tradizione, pur non presenti nel testo, compaiono infatti in filigrana, suggerendo l’ironica presa di distanza dell’autore dagli aspetti più inverosimili e paradossali del mito, conformemente alla sua tendenza a dubitare di ogni dogmatismo e di ogni verità consacrata.
description: ACME, V. 71, N. 2 (2018)
Οι Τούρκοι στα κείμενα της εθνικής σχολικής εορτής της 25ης Μαρτίου: έρευνα υπό το πρίσμα της κριτικής Παιδαγωγικής της Ειρήνης:
Creators: name: Κανέλλα, Στυλιανή Γρηγορίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: εθνικές σχολικές γιορτές
χρήση βίας από τους Τούρκους
στερεότυπα και προκαταλήψεις
national school festivals
violence by Turks
stereotypes and prejustices

description: Ο σκοπός της παρούσας έρευνας είναι να διερευνήσουμε τόσο το θεωρητικό πλαίσιο των εθνικών σχολικών εορτών στην ελληνική πραγματικότητα, όσο και τον τρόπο με τον οποίο παρουσιάζεται η εικόνα των Τούρκων, ως «εθνικών άλλων», μέσα στα κείμενα των σχολικών εορτών, από ερευνητική σκοπιά. Μελετήθηκαν συνοπτικά, η παιδαγωγική της ειρήνης και η εκπαίδευση για την ειρήνη που αποτελούν τη θεωρητική βάση της παρούσας διατριβής, το σχολείο, η σχολική ζωή και οι εξωσχολικές – εξωδιδακτικές δραστηριότητες που λαμβάνουν χώρα μέσα σε αυτή την κοινότητα, καθώς και οι εθνικές σχολικές γιορτές ως προς την έννοια και την προέλευση τους, την ιστορική τους διάσταση, τη λειτουργία και τη σκοποθεσία τους, τον πολυσύνθετο ρόλο τους και τους στόχους τους. Παρατίθενται, επιπλέον, κάποιες σχετικές έρευνες. Τα αποτελέσματα της παρούσας έρευνας επιβεβαιώνουν σε μεγάλο βαθμό τα θεωρητικά δεδομένα, καθώς επιβεβαιώνεται πως μέσα από τις εθνικές σχολικές εορτές αναπαράγονται σε μεγάλο βαθμό αρνητικά στερεότυπα για τους Τούρκους, ασκείται σε σημαντικό βαθμό εθνικοπολιτική και θρησκευτική ιδεολογία, και γενικότερα επηρεάζεται σε σημαντικό βαθμό η διαπαιδαγώγηση των παιδιών και των εφήβων. Τα παραπάνω ευρήματα, επιβάλλουν μία αναθεώρηση στον τρόπο σχεδιασμού και παρουσίασης των σχολικών εορτών αλλά και έναν γενικότερο επαναπροσδιορισμό της εκπαιδευτικής διαδικασίας και του ρόλου του σχολείου.
description: The purpose of this research is to explore both the theoretical framework of the national school holidays in Greek reality, and the way of presenting the image of Turks as "national others " in the texts of the school holidays, from a research perspective . So, briefly studied the pedagogy of peace and peace education which form the theoretical basis of this thesis , school , school life and extracurricular - extra curricular activities that take place within this community, and national school celebrations as to the meaning and origins , their historical dimension, operation and skopothesia , their complex roles and goals . Out some further investigations . The results of this study largely confirm the theoretical data, and confirmed that through the national school holidays reproduced largely negative stereotypes about the Turks exerted significantly ethnikopolitiki and religious ideology, and generally strongly influenced the education of children and adolescents. These findings require a revision to the way in design and presentation of school celebrations and a general redefinition of the educational process and the role of the school.
A decoupling approach to the quantum capacity
Creators: name: Hayden, Patrick
name: Horodecki, Michal
name: Winter, Andreas
name: Yard, Jon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We give a short proof that the coherent information is an achievable rate for the transmission of quantum information through a noisy quantum channel. Our method is to produce random codes by performing a unitarily covariant projective measurement on a typical subspace of a tensor power state. We show that, provided the rank of each measurement operator is sufficiently small, the transmitted data will with high probability be decoupled from the channel's environment. We also show that our construction leads to random codes whose average input is close to a product state and outline a modification yielding unitarily invariant ensembles of maximally entangled codes.
description: 13 pages, published version
Elementi intervisuali nei ditirambi 17 e 18 di Bacchilide
Creators: name: Nobili, Cecilia
Publisher: name: ACME
Year: 2019

description: I ditirambi 17 e 18 di Bacchilide, incentrati sulla figura di Teseo, si prestano in particolar modo a un’indagine intervisuale, nel tentativo di rintracciare rimandi e allusioni alla produzione artistica contemporanea. Ciò avviene in virtù del fatto che la saga di Teseo conosce ad Atene grande sviluppo in ambito iconografico fra il VI e il V secolo a.C., rimanendo invece ai margini della produzione poetica almeno fino alla metà del V secolo. Tale indagine fornisce anche utili indicazioni in merito all’occasione della performance – o ri-performance – dei due ditirambi, che può essere identificata col festival ateniese delle Targelie.
description: ACME, V. 71, N. 2 (2018)
Introduction to the Special Issue "Universality in Pieces? Mobilizations of Science in a Fractured World"
Creators: name: Bečka, Hynek
name: Bhan, Samiksha
name: Kumpf, Desirée
name: Lang, Claudia
name: Nieber, Hanna
name: Vorhölter, Julia
name: Werner, Hanna
Publisher: name: Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology
Year: 2024

description: In recent years – in the context of debates on post-truth, Covid-scepticism and decolonization – the idea that science represents universal knowledge has been challenged from a variety of perspectives. Despite (or because of) this, science and the promise it holds out for generating knowledge that is relevant to solving planetary problems are gaining new valence and momentum. Based on ethnographic research, this special issue investigates mobilizations of science and claims to universality in a variety of different contexts. We ask: When, and around which issues, does universality become mobilized and contested? What are the politics behind specific attempts to universalize and/or localize knowledge? Where do claims to universality enact inclusive and/or exclusive socialities? Our central argument is that universality is both necessary and unreachable, problematic and desirable; it is an elusive, but powerful notion, deeply engrained in the idea of science, which orients people’s actions towards particular goals. Studying people’s varied attempts to universalize or localize knowledge in the name of science – for political, ethical, or pragmatic purposes – offers relevant insights into how people imagine, create, justify or call into question often unequal social structures. It also reveals, as many of the contributions in this issue show, the hopeful visions scientists and citizen-scientists pursue in striving to build better futures. This special issue, then, speaks to a key theme in contemporary anthropological debate, namely the politics of knowledge and the complex quest for epistemic justice in an unequal world.
description: Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology, Bd. 149 Nr. 1 (2024): Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology
A Wideband Spectrum Sensing Method Based on Compressed Sensing by Using Matching Pursuits
Creators: name: Lu, Mi
Publisher: name: figshare
Year: 2021
Subjects: subject: 80501 Distributed and Grid Systems
subject: FOS: Computer and information sciences

description: Secondary users are considered for using the licensed spectrum without causing harmful interference to the primary users in cognitive radios, which results in a challenge for spectrum sensing. Spectrum sensing is an ability of secondary users to independently detect spectral opportunities without any assistance from primary users. The methods based on standard analog-to-digital converters could lead to unaffordable high sampling rate or implementations for wideband spectrum sensing. Based on the compressed sensing theory, a wideband spectrum sensing method is presented. Gabor functions are selected to build the atom dictionary for exploring the sparse representation of the wideband signal. Matching pursuit algorithm is introduced to select the optimal atoms that can result in the most sparsity of representation. Finally, Wigner-distribution is used to reconstruct the spectrum of the wideband spectrum on the sparse representation. Simulation results show that this method can greatly decrease the sampling rate of the wideband signal and sense the primary user’s existence successfully.
The Axis of Evil revisited
Creators: name: Land, Kate
name: Magueijo, Joao
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In light of the three-year data release from WMAP we re-examine the evidence for the ``Axis of Evil'' (AOE). We discover that previous statistics are not robust with respect to the data-sets available and different treatments of the galactic plane. We identify the cause of the instability and implement an alternative ``model selection'' approach. A comparison to Gaussian isotropic simulations find the features significant at the 94-98% level, depending on the particular AOE model. The Bayesian evidence finds lower significance, ranging from ``substantial'' at $Δ(\ln E)\sim 1.4$, to no evidence for the most general AOE model.
description: 7 pages, accepted to MNRAS
The Monitor project: the search for transits in the open cluster NGC 2362
Creators: name: Miller, Adam A.
name: Irwin, Jonathan
name: Aigrain, Suzanne
name: Hodgkin, Simon
name: Hebb, Leslie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a systematic search for transiting planets in a ~5 Myr open cluster, NGC 2362. We observed ~1200 candidate cluster members, of which ~475 are believed to be genuine cluster members, for a total of ~100 hours. We identify 15 light curves with reductions in flux that pass all our detection criteria, and 6 of the candidates have occultation depths compatible with a planetary companion. The variability in these six light curves would require very large planets to reproduce the observed transit depth. If we assume that none of our candidates are in fact planets then we can place upper limits on the fraction of stars with hot Jupiters (HJs) in NGC 2362. We obtain 99% confidence upper limits of 0.22 and 0.70 on the fraction of stars with HJs (f_p) for 1-3 and 3-10 day orbits, respectively, assuming all HJs have a planetary radius of 1.5R_Jup. These upper limits represent observational constraints on the number of stars with HJs at an age
description: 17 pages, 11 figures, accepted to MNRAS
Transport in Bilayer Graphene: Calculations within a self-consistent Born approximation
Creators: name: Koshino, Mikito
name: Ando, Tsuneya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The transport properties of a bilayer graphene are studied theoretically within a self-consistent Born approximation. The electronic spectrum is composed of $k$-linear dispersion in the low-energy region and $k$-square dispersion as in an ordinary two-dimensional metal at high energy, leading to a crossover between different behaviors in the conductivity on changing the Fermi energy or disorder strengths. We find that the conductivity approaches $2e^2/π^2\hbar$ per spin in the strong-disorder regime, independently of the short- or long-range disorder.
description: 8 pages, 5 figures
Afterword: The Sites of Universalities: Ethnographic Engagements with/of Sciences
Creators: name: Dippel, Anne
name: Thomas, Renny
Publisher: name: Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology
Year: 2024

description: How do we do an ethnography of universalities? Is it possible to reconcile local specifi cities with universalities through/in ethnography? That is the question the authors in this special issue ask and engage with. If ethnography is about specificities and specific locations, about contexts, how can we imagine an ethnography of ‘universals’? The question sounds simplistic at the first glance, but it becomes more complex as we address it in relation to the articles in this special issue. The topic is of importance since it reinforces the tension between universal truth claims and relative interpretations of the world through scientifi c reasoning. It has been exacerbated by media technologies. Political authorities who either have both feet firmly on the ground of scientific majority’s opinion or question it for their own benefit face resistance from globally networked communities. The old debate between mostly Marxist-positioned empiricism and postmodern relativism is taking a new turn in these digital times.
description: Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology, Bd. 149 Nr. 1 (2024): Zeitschrift für Ethnologie/Journal of Social and Cultural Anthropology
Research on switching operation transient electromagnetic environment of substations in a coal mine
Creators: name: Lu, Mi
Publisher: name: figshare
Year: 2021
Subjects: subject: 40401 Electrical and Electromagnetic Methods in Geophysics
subject: FOS: Earth and related environmental sciences

description: Research of switching operation transient electromagnetic field in substations is fundamental to the protection of mine monitoring systems against electromagnetic interference. Three models, which are the equivalent circuit of switching on/off inductive load, transient radiation of short dipole, and transmission line of long cable, are built for numerical analysis. The results indicate that switching operation does not produce transient pulse when the breaking angle is close to 90°. Electric fields are the primary form of transient pulse radiation, and the effect of the magnetic field on the environment can be ignored. Long cables are naturally resistant to differential mode transient pulse propagation, but the effect of common mode transient pulse cannot be ignored. Energy distribution of transient pulse in different frequency ranges is calculated by using the Parserval equation. Furthermore, the measurement frequencies and the instruments used in the coal mine are determined, and on-site data is then obtained. Measurement results show that switching operation may produce a series of transient pulses, causing the electric field to grow larger than before. Specifically, conducted emissions have large impacts on the monitoring circuitry of the mine equipment, causing the mine monitoring system to frequently record erroneous data and omit information.
A simple proof checker for real-time systems
Creators: name: Leung, Catherine
Publisher: name: University of British Columbia
Year: 2009

description: This thesis presents a practical approach to verifying real-time properties of V L S I designs. A simple proof checker with built-in decision procedures for linear programming and predicate calculus offers a pragmatic approach to verifying real-time systems in return for a slight loss of formal rigor when compared with traditional theorem provers. In this approach, an abstract data type represents the hypotheses, claim, and pending proof obligations at each step. A complete proof is a program that generates a proof state with the derived claim and no pending obligations. The user provides replacements for obligations and relies on the proof checker to validate the soundness of each operation. This design decision distinguishes the proof checker from traditional theorem provers, and enhances the view of "proofs as programs". This approach makes proofs robust to incremental changes, and there are few "surprises" when applying rewrite rules or decision procedures to proof obligations. A hand-written proof constructed to verify the timing correctness of a high bandwidth communication protocol was verified using this checker.
Farm Businesses End the Decade with Strong Financial Performance
Creators: name: Morehart, Mitchell J.
name: Johnson, James D.
name: Banker, David E.
name: Morehart, Mitchell J.
name: Johnson, James D.
name: Banker, David E.
Publisher: name: Unknown
Year: 1990
Subjects: Agricultural Finance
Financial Economics
Production Economics

description: This report presents the latest information on the financial performance of U.S. farms. The findings summarize the upcoming Financial Characteristics of U.S. Farms, January 1, 1990. Data were obtained from the Farm Costs and Returns Survey (FCRS) conducted in February and March 1990 by USDA's National Agricultural Statistics Service. About 24,000 farmers across the Nation participated in the survey, which detailed whole-farm data for all survey respondents plus enterprise-specific data for selected commodities.
On the spectrum of the Sinh-Gordon model in finite volume
Creators: name: Teschner, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive a characterization of the spectrum of the Sinh-Gordon model in terms of certain nonlinear integral equations. There exists a large class of solutions to these equations which allows a continuation between the infrared and the ultraviolet limits, respectively. We present nontrivial evidence for the claim that the class of solutions in question describes the spectrum of the Sinh-Gordon model completely in both of these limits. The evidence includes some nontrivial relations to Liouville theory.
description: 33 pages, the new version corrects a mistake in the lattice TBA of the previous versions
Imaging electrons in a magnetic field
Creators: name: Aidala, Katherine E.
name: Parrott, Robert E.
name: Heller, E. J.
name: Westervelt, R. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present simulations of an imaging mechanism that reveals the trajectories of electrons in a two-dimensional electron gas (2DEG), as well as simulations of the electron flow in zero and small magnetic fields. The end goal of this work is to implement the proposed mechanism to image the flow of electrons inside a ballistic electron device from one specific point (A) to another (B) in a 2DEG, using a low temperature scanning probe microscope with a charged tip. The tip changes the electron density in the 2DEG beneath it and deflects the electrons traveling nearby, thereby changing the conductance from point A to point B. The simulations presented here show that by measuring the transmission of electrons from A to B versus tip position, one can image the electron flow. This forward scattering mechanism is well suited for imaging in a magnetic field, in contrast to previous probes that depended on backscattering. One could use this technique to image cyclotron orbits in an electron focusing geometry, in which electrons travel from point A to point B in semi-circular paths bouncing along a wall. Imaging the motion of electrons in magnetic fields is useful for the development of devices for spintronics and quantum information processing.
Preservice elementary teachers' conceptual and procedural knowledge of mean, median, and mode
Creators: name: Groth, Randall E.
name: Bergner, Jennifer A.
Publisher: name: Maryland Shared Open Access Repository
Year: 2006
Subjects: preservice elementary school teachers
mathematics teaching

description: The paper describes aspects of the statistical content knowledge of 46 preservice elementary school teachers. The preservice teachers responded to a written item designed to assess their knowledge of mean, median, and mode. The data produced in response to the written item were examined in light of the Structure of the Observed Learning Outcome (SOLO) Taxonomy (Biggs & Collis, 1982, 1991) and Ma’s (1999) conception of Profound Understanding of Fundamental Mathematics (PUFM). Four levels of thinking in regard to comparing and contrasting mean, median, and mode are described. Several different categories of written definitions for each measure of central tendency are also described. Connections to previous statistical thinking literature are discussed, implications for teacher education are given, and directions for further research are suggested.
Computer Simulation of Particle Suspensions
Creators: name: Harting, Jens
name: Hecht, Martin
name: Herrmann, Hans J.
name: McNamara, Sean
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Particle suspensions are ubiquitous in our daily life, but are not well understood due to their complexity. During the last twenty years, various simulation methods have been developed in order to model these systems. Due to varying properties of the solved particles and the solvents, one has to choose the simulation method properly in order to use the available compute resources most effectively with resolving the system as well as needed. Various techniques for the simulation of particle suspensions have been implemented at the Institute for Computational Physics allowing us to study the properties of clay-like systems, where Brownian motion is important, more macroscopic particles like glass spheres or fibers solved in liquids, or even the pneumatic transport of powders in pipes. In this paper we will present the various methods we applied and developed and discuss their individual advantages.
description: 31 pages, 11 figures, to appear in Lecture Notes in Applied and Computational Mechanics, Springer (2006)
An improved LANDMARC indoor localization algorithm based on CKF
Creators: name: Lu, Mi
Publisher: name: figshare
Year: 2021
Subjects: subject: 80501 Distributed and Grid Systems
subject: FOS: Computer and information sciences

description: Aiming at the problems of low location accuracy and poor adaptability in the traditional LANDMARC localization algorithm by the interference of the indoor environment, an improved LANDMARC indoor location algorithm based on CKF is proposed in this paper. Firstly, the algorithm obtains the state prediction value of the target to be targeted by the traditional LANDMARC algorithm. Then, with the purpose of improving the localization accuracy of the algorithm and reducing the fluctuation of the positioning result, the obtained state prediction value is taken as the observation and filtered by the Cubature Kalman Filter (CKF) algorithm . Finally, the results obtained by filtering are used instead of the estimated values obtained by LANDMARC as the state estimates of the targets to be targeted. The experimental results show that the proposed algorithm improves the localization accuracy and volatility compared with the traditional LANDMARC localization algorithm and the LANDMARC localization algorithm based on the Unscented Kalman Filter (UKF) algorithm, with the localization error of 60% in the tested label is less than 0.5m, it can get a realistic goal of moving trajectories used in indoor localization.
New critical behavior in unconventional ferromagnetic superconductors
Creators: name: Uzunov, Dimo I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: New critical behavior in unconventional superconductors and superfluids is established and described by the Wilson-Fisher renormalization-group method. For certain ordering symmetries a new type of fluctuation-driven first order phase transitions at finite and zero temperature are predicted. The results can be applied to a wide class of ferromagnetic superconducting and superfluid systems, in particular, to itinerant ferromagnets as UGe2 and URhGe.
description: 12 pages, 6 figs
Phase Transitions Affected by Natural and Forceful Molecular Interconversion
Creators: name: Longo, Thomas J.
name: Anisimov, Mikhail A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: If a binary liquid mixture, composed of two alternative species with equal amounts, is quenched from a high temperature to a low temperature, below the critical point of demixing, then the mixture will phase separate through a process known as spinodal decomposition. However, if the two alternative species are allowed to interconvert, either naturally (e.g. the equilibrium interconversion of enantiomers) or forcefully (e.g. via an external source of energy or matter), then the process of phase separation may drastically change. In this case, depending on the nature of interconversion, two phenomena could be observed: either phase amplification, the growth of one phase at the expense of another stable phase, or microphase separation, the formation of nongrowing (steady-state) microphase domains. In this work, we generalize the Cahn-Hilliard theory of spinodal decomposition to include molecular interconversion of species and describe the physical properties of systems undergoing either phase amplification or microphase separation. We apply the developed theory to describe the simulation results of three atomistic models which demonstrate phase amplification and/or microphase separation. We also discuss the application of our approach to phase transitions in polyamorphic liquids. Lastly, we describe the effects of fluctuations of the order parameter in the critical region on phase amplification and microphase separation.
description: Accepted for publication at JCP
4.2_Eecen: Flexibility options for offhore wind farms
Creators: name: Eecen, Peter
Publisher: name: Zenodo
Year: 2019
Subjects: Offshore wind, Flexibility

description: Results from the REALCOE WP7 Business and Finance. REALCOE aims to develop knowledge and technology for a 12+MW wind turbine with the aim to demonstrate the 12+MW turbine. Flexibility options for offshore wind farms have been addressed and potential benefit is identified for short, medium and longer term.
The Invisible Z' at the LHC
Creators: name: Petriello, Frank J.
name: Quackenbush, Seth
name: Zurek, Kathryn M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the feasibility of observing an invisibly decaying Z' at the LHC through the process pp -> ZZ' -> l+l-XX*, where X is any neutral, (quasi-) stable particle, whether a Standard Model (SM) neutrino or a new state. The measurement of the invisible width through this process facilitates both a model independent measurement of Gamma_{Z' -> \bar{nu} nu} and potentially detection of light neutral hidden states. Such particles appear in many models where the Z' is a messenger to a hidden sector, and also if dark matter is charged under the U(1)' of the Z'. We find that with as few as 30 fb^-1 of data the invisibly decaying Z' can be observed at 5 sigma over SM background for a 1 TeV Z' with reasonable couplings. If the Z' does not couple to leptons and therefore cannot be observed in the Drell-Yan channel, this process becomes a discovery mode. For reasonable hidden sector couplings, masses up to 2 TeV can be probed at the LHC. If the Z' does couple to leptons, then the rate for this invisible decay is predicted by on-peak data and the presence of additional hidden states can be searched for. With 100 fb^-1 of data, the presence of excess decays to hidden states can be excluded at 95% C.L. if they comprise 20-30% of the total invisible cross section.
description: 18 pages, 11 figures. References added
Heisenberg-limited ground state energy estimation for early fault-tolerant quantum computers
Creators: name: Lin, Lin
name: Tong, Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Under suitable assumptions, the quantum phase estimation (QPE) algorithm is able to achieve Heisenberg-limited precision scaling in estimating the ground state energy. However, QPE requires a large number of ancilla qubits and large circuit depth, as well as the ability to perform inverse quantum Fourier transform, making it expensive to implement on an early fault-tolerant quantum computer. We propose an alternative method to estimate the ground state energy of a Hamiltonian with Heisenberg-limited precision scaling, which employs a simple quantum circuit with one ancilla qubit, and a classical post-processing procedure. Besides the ground state energy, our algorithm also produces an approximate cumulative distribution function of the spectral measure, which can be used to compute other spectral properties of the Hamiltonian.
The acceleration characteristics of solar energetic particles in the 2000 July 14 event
Creators: name: Li, C.
name: Tang, Y. H.
name: Dai, Y.
name: Zong, W. G.
name: Fang, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In large gradual solar energetic particle (SEP) events, especially the ground-level enhancement (GLE) events, where and how energetic particles are accelerated is still a problem. By using imaging data from TRACE, Yohkoh/HXT, SOHO/MDI and SOHO/EIT, along with the data from the GOES, Apatity NM, and SOHO/LASCO CME catalog, the evolution of the X5.7 two-ribbon flare and the associated SEP event on 14 July 2000 are studied. It is found that the magnetic reconnection in this event consists of two parts, and the induced electric field Erec is temporally correlated with the evolution of hard X-ray and gamma-ray emission. In particular, the first hard X-ray and gamma-ray emission peak occurred at 10:22 UT, corresponding to the magnetic reconnection in the western part of the flare ribbons and the maximum Erec of 9.5 V/cm; the second emission peak at 10:27 UT, corresponding to the eastern part and the maximum Erec of 13.0 V/cm. We also analyze the SEP injection profiles as functions of time and CME-height, and find two-component injection which may result from different acceleration mechanisms. A reasonable conclusion is that reconnection electric field makes a crucial contribution to the acceleration of relativistic particles and to the impulsive component of the large gradual SEP event, while CME-driven shocks play a dominant role in the gradual component.
description: 6 pages, 7 figures, A&A, 461, 1115
Alternative high-performance architectures for communication protocols
Creators: name: Jain, Parag Kumar
Publisher: name: University of British Columbia
Year: 2009

description: The traditional communication protocol architectures have a number of components that present bottlenecks to achieving high performance. These bottlenecks include the way the protocols are designed and the way protocol stacks are structured and implemented. With the advent of high speed networks, the future communication environment is expected to comprise of a variety of networks with widely varying characteristics. The next generation multimedia applications require transfer of a wide variety of data such as voice, video, graphics, and text and have widely varying access patterns such as interactive, bulk transfer, and real-time guarantees. Traditional protocol architectures have difficulty in supporting multimedia applications and high-speed networks because they are neither designed nor implemented for such a diverse communication environment. This thesis analyzes the drawbacks of traditional protocol architectures and proposes alternative high-performance architectures for multimedia applications and high-speed network environments. Three protocol architectures are proposed: Direct Application Association, Integrated Layered Logical Multiplexing, and Non-Monolithic Protocol Architectures. To demonstrate the viability of these architectures, a protocol independent framework for each proposed protocol architecture is implemented in the context of a parallelized version of the z-kernel. Implementation of the TCP/UDP-IP-Ethernet protocol stack for each of the proposed architectures demonstrates that the performance of these protocol architectures is comparable to that of a traditional protocol architecture. In addition, the proposed architectures are more scalable on multiprocessor systems than the traditional protocol architecture and enable some of the key requirements (Application specific Quality of Service, Application Level Framing) and optimizations (such as n Integrated Layer Processing) necessary for the future communication environment.
Συγκριτική μελέτη των τρόπων επικοινωνίας ατόμων με βαριά νοητική υστέρηση κατά την αλληλεπίδραση με γονείς ή επαγγελματίες φροντιστές:
Creators: name: Μάρρα, Ραφαέλα Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: άτομα με βαριά νοητική υστέρηση
γονείς και επαγγελματίες φροντιστές
επικοινωνία
people with profound mental handicap
parents and professional carers
communication

description: Τα άτομα με βαριά νοητική υστέρηση διαθέτουν δεξιότητες επικοινωνίας. Αυτές αναδεικνύονται κατά την αλληλεπίδραση με έναν φροντιστή ο οποίος ανταποκρίνεται με ευαισθησία στα σήματα του ατόμου. Στην παρούσα έρευνα παρατηρήθηκαν έξι δυάδες ατόμων με βαριάς μορφής αναπηρία που διέμεναν σε ίδρυμα και βιντεοσκοπήθηκαν κατά τη διάρκεια της αλληλεπίδρασης με τους επαγγελματίες φροντιστές και έξι δυάδες ατόμων που διέμεναν με την οικογένειά τους κατά την αλληλεπίδραση με τους γονείς φροντιστές. Για την αξιολόγηση της αλληλεπίδρασης εφαρμόστηκε η μέθοδος της συστηματικής παρατήρησης και τα δεδομένα αναλύθηκαν με την εφαρμογή του πακέτου SPSS. Τα αποτελέσματα έδειξαν ότι η επικοινωνία των ατόμων με αναπηρία με τους φροντιστές τους ήταν καλή. Ως προς κάποιες συμπεριφορές η επικοινωνία των ατόμων που διέμεναν με την οικογένειά τους ήταν καλύτερη σε σχέση με εκείνων που διέμεναν στο ίδρυμα. Όσον αφορά τις συμπεριφορές των φροντιστών, σε κάποιες συμπεριφορές, οι γονείς φροντιστές διαφοροποιήθηκαν από τους επαγγελματίες φροντιστές. Τέλος, προέκυψε συγχρονισμός ως προς τις συμπεριφορές των φροντιστών με εκείνες των ατόμων. Πολλά από τα ευρήματα συνάδουν με τα ευρήματα άλλων ερευνών στο συγκεκριμένο ερευνητικό πεδίο και συνιστούν έναυσμα για περαιτέρω μελέτη στον ελληνικό χώρο.
description: People with profound mental handicap have communication skills. These skills are highlighted during the interaction with a carer, who responds to the person’s signals with sensitivity. In the current study six couples of people with severe disability who lived in an institution were videotaped while interacting with the professional carers and six couples of people who lived with their family were videotaped during their interaction with the parent. For the assessment of the interaction SPSS was applied. The results indicated that the emotional communication of people with disability with their carers was effective. In some behaviors the performance of people who lived with their family was more effective than those who stayed at the institution. In reference to carers’ behaviors, there were some statistical differences between professional carers and family. Finally, statistically positive correlation emerged from the observed behaviors during dual interaction in both groups. Many of the aforementioned findings accord with the findings of previous research and pave the way for further study in Greece.
RFID 3D-LANDMARC Localization Algorithm Based on Quantum Particle Swarm Optimization
Creators: name: Lu, Mi
Publisher: name: figshare
Year: 2021
Subjects: subject: 80501 Distributed and Grid Systems
subject: FOS: Computer and information sciences

description: Location information is crucial in various location-based applications, the nodes in location system are often deployed in the 3D scenario in particle, so that localization algorithms in a three-dimensional space are necessary. The existing RFID three-dimensional (3D) localization technology based on the LANDMARC localization algorithm is widely used because of its low complexity, but its localization accuracy is low. In this paper, we proposed an improved 3D LANDMARC indoor localization algorithm to increase the localization accuracy. Firstly, we use the advantages of the RBF neural network in data fitting to pre-process the acquired signal and study the wireless signal transmission loss model to improve localization accuracy of the LANDMARC algorithm. With the purpose of solving the adaptive problem in the LANDMARC localization algorithm, we introduce the quantum particle swarm optimization (QPSO) algorithm, which has the technology advantages of global search and optimization, to solve the localization model. Experimental results have shown that the proposed algorithm improves the localization accuracy and adaptability significantly, compared with the basic LANDMARC algorithm and particle swarm optimization LANDMARC algorithm, and it can overcome the shortcoming of slow convergence existed in particle swarm optimization.
Rigidity and volume preserving deformation on degenerate simplices
Creators: name: Zhang, Lizhao
Publisher: name: arXiv
Year: 2007
Subjects: subject: Metric Geometry (math.MG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52C, 05

description: Given a degenerate $(n+1)$-simplex in a $d$-dimensional space $M^d$ (Euclidean, spherical or hyperbolic space, and $d\geq n$), for each $k$, $1\leq k\leq n$, Radon's theorem induces a partition of the set of $k$-faces into two subsets. We prove that if the vertices of the simplex vary smoothly in $M^d$ for $d=n$, and the volumes of $k$-faces in one subset are constrained only to decrease while in the other subset only to increase, then any sufficiently small motion must preserve the volumes of all $k$-faces; and this property still holds in $M^d$ for $d\geq n+1$ if an invariant $c_{k-1}(α^{k-1})$ of the degenerate simplex has the desired sign. This answers a question posed by the author, and the proof relies on an invariant $c_k(ω)$ we discovered for any $k$-stress $ω$ on a cell complex in $M^d$. We introduce a characteristic polynomial of the degenerate simplex by defining $f(x)=\sum_{i=0}^{n+1}(-1)^{i}c_i(α^i)x^{n+1-i}$, and prove that the roots of $f(x)$ are real for the Euclidean case. Some evidence suggests the same conjecture for the hyperbolic case.
description: 27 pages, 2 figures. To appear in Discrete & Computational Geometry
Hall plateau diagram for the Hofstadter butterfly energy spectrum
Creators: name: Koshino, Mikito
name: Ando, Tsuneya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We extensively study the localization and the quantum Hall effect in the Hofstadter butterfly, which emerges in a two-dimensional electron system with a weak two-dimensional periodic potential. We numerically calculate the Hall conductivity and the localization length for finite systems with the disorder in general magnetic fields, and estimate the energies of the extended levels in an infinite system. We obtain the Hall plateau diagram on the whole region of the Hofstadter butterfly, and propose a theory for the evolution of the plateau structure with increasing disorder. There we show that a subband with the Hall conductivity $n e^2/h$ has $|n|$ separated bunches of extended levels, at least for an integer $n \leq 2$. We also find that the clusters of the subbands with identical Hall conductivity, which repeatedly appear in the Hofstadter butterfly, have a similar localization property.
description: 9 pages, 12 figures
An exploration of students' statistical thinking
Creators: name: Groth, Randall E.
Publisher: name: Maryland Shared Open Access Repository
Year: 2006
Subjects: statistical thinking
mathematics teaching
law of large numbers
linear transformations
averages
experimental study design

description: The statistical thinking exhibited by 14-19 year old students during clinical interview sessions is described. The students’ thinking in regard to fundamental statistics concepts is reported in order to help inform instructional practice.