cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Radioactively-Powered Rising Lightcurves of Type Ia Supernovae
Creators: name: Piro, Anthony L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The rising luminosity of the recent, nearby supernova 2011fe shows a quadratic dependence with time during the first 0.5-4 days. In addition, the composite lightcurves formed from stacking together many Type Ia supernovae (SNe Ia) show a similar power-law index of 1.8+-0.2 with time. I explore what range of power-law rises are possible due to the presence of radioactive material near the surface of the exploding white dwarf (WD). I summarize what constraints such a model places on the structure of the progenitor and the distribution and velocity of ejecta. My main conclusion is that the rise of SN 2011fe requires a mass fraction 0.03 of 56Ni (or some other heating source like 48Cr) distributed between a depth of ~0.004-0.1Msun below the WD's surface. Radioactive elements this shallow are not found in simulations of a single C/O detonation. Scenarios that may produce this material include helium-shell burning during a double-detonation ignition, a gravitationally confined detonation, and a subset of deflagration to detonation transition models. In general, the power-law rise can differ from quadratic depending on the details of the event, so comparisons of this work with observed bolometric rises of SNe Ia would place strong constraints on the distribution of shallow radioactive material, providing important clues for identifying the elusive progenitors of SNe Ia.
description: 7 pages, 4 figures, submitted for publication in The Astrophysical Journal
TouchRAM: A Multitouch-Enabled Tool for Aspect-Oriented Software Design
Creators: name: Abed, Wisam Al
name: Bonnet, Valentin
name: Schottle, Matthias
name: Yildirim, Engin
name: Alam, Omar
name: Kienzle, Jorg
Publisher: name: Springer
Year: 2012

description: This paper presents TouchRAM, a multitouch-enabled tool for agile software design modeling aimed at developing scalable and reusable software design models. The tool gives the designer access to a vast library of reusable design models encoding essential recurring design concerns. It exploits model interfaces and aspect-oriented model weaving techniques as defined by the Reusable Aspect Models (RAM) approach to enable the designer to rapidly apply reusable design concerns within the design model of the software under development. The paper highlights the user interface features of the tool specifically designed for ease of use, reuse and agility (multiple ways of input, tool-assisted reuse, multitouch), gives an overview of the library of reusable design models available to the user, and points out how the current state-of-the-art in model weaving had to be extended to support seamless model reuse.
Probing dark energy beyond $z=2$ with CODEX
Creators: name: Vielzeuf, P. E.
name: Martins, C. J. A. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Precision measurements of nature's fundamental couplings and a first measurement of the cosmological redshift drift are two of the key targets for future high-resolution ultra-stable spectrographs such as CODEX. Being able to do both gives CODEX a unique advantage, allowing it to probe dynamical dark energy models (by measuring the behavior of their equation of state) deep in the matter era and thereby testing classes of models that would otherwise be difficult to distinguish from the standard $Λ$CDM paradigm. We illustrate this point with two simple case studies.
description: 4 pages, 4 figures; submitted to Phys. Rev. D
Jet Reconstruction with Particle Flow in Heavy-Ion Collisions with CMS
Creators: name: Nguyen, Matthew
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In the particle-flow approach information from all available sub-detector systems is combined to reconstruct all stable particles. The global event reconstruction has been shown to improve, in particular, the resolution of jet energy and missing transverse energy in pp collisions compared to purely calorimetric measurements. This improvement is achieved primarily by combining the precise momentum determination of charged hadrons in the silicon tracker with the associated energy depositions in the calorimeters. By resolving individual particles inside jets, particle flow reduces the sensitivity of the jet energy scale to the jet fragmentation pattern, which is known to be one of the largest sources of systematic uncertainty in jet reconstruction. Particle flow reconstruction is thus potentially well-suited for the study of potential modifications to jet fragmentation in heavy-ion collisions. The particle flow algorithm has been adapted to the heavy-ion environment. The performance of jet reconstruction from particle flow objects in PbPb collisions using the anti-kT jet reconstruction algorithm is presented.
description: proceedings for the Quark Matter 2011 conference in Annecy, France
Influencing Experience: The Effects of Reading Game Reviews on Player Experience
Creators: name: Livingston, Ian J.
name: Nacke, Lennart E.
name: Mandryk, Regan L.
Publisher: name: Springer
Year: 2011

description: Game reviews are used by game developers for making business decisions and measuring the success of a title, and have been shown to affect player perception of game quality. We conducted a study where players read positive or negative reviews of a game before playing, and show that the valence of review text affected game ratings and that these differences could not be explained by mediating changes in mood. Although we show predictable changes in player experience over the course of the study (measured objectively through physiological sensors), there were no objective differences in experience depending on review valence. Our results suggest that reading reviews does not directly affect play experience, but rather is a post-play cognitive rationalization of the experience with the content of the review. Our results are important for understanding player experience and to the game industry where reviews and user forums affect a game’s commercial success.
Probing the Person-Patina Relationship: A Correlational Study on the Psychology of Senescent Environments
Creators: name: Wells, Jeremy C.
Publisher: name: Digital Repository at the University of Maryland
Year: 2020
Subjects: historic preservation
environmental psychology
patina
age value
preservation practice
decay

description: This data repository consists of the following documents: - "Wells - Probing the Person-Patina Relationship (pre-print).pdf": Pre-print, working paper of the published journal article. - "Person-patina study - survey responses.csv": raw survey responses - "Person-patina study - survey instrument.pdf": survey instrument
description: There is a lack of research on people’s psychological perceptions to decay or patina that is part of the historic environment. Built heritage conservation doctrine and law are based on the assumption that all people have a similar, positive aesthetic perception to patina in the built environment, although there are very few empirical studies that have attempted to confirm or challenge this assumption. This study is based on the statistical analysis of survey data from 864 people in the United States who ranked 24 images of old, decayed building materials and 7 control images of new building materials based on aesthetic qualities, condition, and perceived age. The results indicate that people do not like decayed earthen building materials, concrete, or ferrous metals and have a neutral opinion of the aesthetic qualities of aged brick, preferring new brick as well as aged wood. While there are small differences based on race, ethnicity, and gender, the largest difference in responses is between people who work in the historic preservation/CRM field and those who do not. This finding appears to indicate that people who work in these fields have a different psychological response to decay/patina in the built environment than laypeople, which has important ramifications in terms of decision-making processes regarding interventions in the older built environment.
Synthesis of novel rare earth - iron oxide chalcogenides with the La2Fe2O3Se2 structure
Creators: name: Charkin, D. O.
name: Plotnikov, V. A.
name: Sadakov, A. V.
name: Omel'yanovskii, O. E.
name: Kazakov, S. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Our searches for new oxide chalcogenides of rare earths and Fe, Co, Ni, and Zn resulted in preparation of two new compounds Ce2Fe2O3S2 and Pr2Fe2O3S2 which are isostructural to La2Fe2O3Se2 and Sm2Ti2O3Sb2. Crystal structures of the new compounds Ce2Fe2O3S2 and Pr2Fe2O3S2 were determined from powder X-ray diffraction data. Magnetic measurements were performed for Ce2Fe2O3S2 and revealed behavior very similar to that of isostructural oxide chalcogenides of iron and pnictides of titanium. In particular, no superconductivity was observed down to 4 K. Crystal chemical factors determining the stability of the La2Fe2O3Se2 structure type are discussed.
description: Author version, 11 pages, 3 figures, 4 tables
Analysis and comparison of target assistance techniques for relative ray-cast pointing
Creators: name: Bateman, Scott
name: Mandryk, Regan L.
name: Gutwin, Carl
name: Xiao, Robert
Publisher: name: Elsevier
Year: 2013

description: Pointing at displays from a distance is becoming a common method of interacting with computer applications and entertainment systems, using devices such as the Wii Remote, the PlayStation Move controller, or the Microsoft Kinect. These systems often implement relative forms of ray-cast pointing, in which the user simply points a hand-held input device towards targets on the screen. Ray-casting interaction is easy for novices to learn and understand, but this technique often suffers from accuracy problems: for example, hand jitter, arm fatigue, calibration drift, or lack of skill can all reduce people’s ability to acquire and select on-screen targets. In this paper, we analyse and evaluate the idea of target assistance as a way to address the accuracy problems of ray-cast pointing. Although several assistance schemes have been proposed for mouse-based pointing, these ideas have not been tested in distant-pointing settings, and there is little knowledge available to guide design in this increasingly common interaction scenario. To establish this basic design knowledge, we carried out four studies of relative ray-casting using three different target assistance techniques—two motor-space techniques (sticky targets and a novel form of target gravity), and one acquisition-feedback technique that combined visual, tactile, and auditory feedback. Our first three studies tested each assistance technique separately, to explore how different parameters for each method affected performance and perceptibility. Our fourth study carried out a direct comparison of the best versions of each technique, and also examined the effects of distractor objects placed in the path to the target. Our studies found that the two motor-space techniques were extremely effective in improving selection accuracy without being highly obvious to users, and that the new gravity-based technique (which attracts the cursor even when it is not over the target) performed best of all. There was no observed effect on performance when the combined acquisition-feedback technique was used. Our studies are the first to comprehensively explore the optimization, performance, and perceptibility of target assistance techniques for relative ray-casting—our results provide designers with clear guidelines about what methods to use, how to configure the techniques, and what effects can be expected from their use.
Geometric Langevin equations on submanifolds and applications to the stochastic melt-spinning process of nonwovens and biology
Creators: name: Grothaus, Martin
name: Stilgenbauer, Patrik
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this article we develop geometric versions of the classical Langevin equation on regular submanifolds in euclidean space in an easy, natural way and combine them with a bunch of applications. The equations are formulated as Stratonovich stochastic differential equations on manifolds. The first version of the geometric Langevin equation has already been detected before by Lelièvre, Rousset and Stoltz with a different derivation. We propose an additional extension of the models, the geometric Langevin equations with velocity of constant absolute value. The latters are seemingly new and provide a galaxy of new, beautiful and powerful mathematical models. Up to the authors best knowledge there are not many mathematical papers available dealing with geometric Langevin processes. We connect the first version of the geometric Langevin equation via proving that its generator coincides with the generalized Langevin operator proposed by Soloveitchik, Jorgensen and Kolokoltsov. All our studies are strongly motivated by industrial applications in modeling the fiber lay-down dynamics in the production process of nonwovens. We light up the geometry occuring in these models and show up the connection with the spherical velocity version of the geometric Langevin process. Moreover, as a main point, we construct new smooth industrial relevant three-dimensional fiber lay-down models involving the spherical Langevin process. Finally, relations to a class of self-propelled interacting particle systems with roosting force are presented and further applications of the geometric Langevin equations are given.
Theory of Tabletop Territoriality
Creators: name: Scott, Stacey D.
name: Carpendale, Sheelagh
Publisher: name: Springer
Year: 2010

description: This chapter discusses empirical and theoretical investigations of the practice of tabletop territoriality in order to understand how to exploit such social interaction practices that people have developed over years of collaborating in traditional tabletop environments in the design of digital tabletops. These investigations reveal that collaborators at traditional tabletop workspaces use three types of tabletop territories to help coordinate their interactions within the shared tabletop workspace: personal, group, and storage territories. These tabletop territories facilitate collaborative interactions on a table by providing commonly understood social protocols that help people to share a tabletop workspace by clarifying which regions are available for individual or joint task work, to delegate task responsibilities, to coordinate access to task resources by providing lightweight mechanisms to reserve and share task resources, and to organize the task resources in the workspace.
Evidence for incompressible states in a metal graphene tunnel junction in high magnetic field
Creators: name: Malec, C. E.
name: Davidović, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present transport measurements of tunnel junctions made between Cu and graphene in a magnetic field. We observe a transition to a Landau level like structure at high fields, as well as a set of sharp features in the tunneling spectra that shift with gate and tunnel probe voltage along the lines of constant charge density. We explain the sharp features with the formation of degeneracy split localized Landau levels, and addition of electrons to those levels one by one. A large capacitive coupling to the tunnel probe also increases the gate voltage spacing between the Landau levels.
description: 12 pages, 3 figures
Generalized Coherent States and Extremal Positive Operator Valued Measures
Creators: name: Heinosaari, Teiko
name: Pellonpää, Juha-Pekka
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a correspondence between positive operator valued measures (POVMs) and sets of generalized coherent states. Positive operator valued measures describe quantum observables and, similarly to quantum states, also quantum observables can be mixed. We show how the formalism of generalized coherent states leads to a useful characterization of extremal POVMs. We prove that covariant phase space observables related to squeezed states are extremal, while the ones related to number states are not extremal.
Choice v. equality : the legal recognition of unmarried cohabitation in Canada
Creators: name: Mohs, Anne
Publisher: name: University of British Columbia
Year: 2010

description: Over the last 40 years, unmarried cohabitation has become one of the fastest growing family forms in Canada. This growth was accompanied by an increasing social acceptance and legal recognition, which was mainly implemented by expanding marital rights and responsibilities to unmarried cohabiting individuals. However, this legal development did not happen without dispute and many scholars argued that marital regulations should not be applied to unmarried cohabiting couples. This thesis is concerned with examining the debate and trying to answer the question of whether marriage and unmarried cohabitation should be legally assimilated. It not only looks at the arguments of the literature, but also examines the reasoning of the Supreme Court of Canada in Miron v. Trudel and Nova Scotia v. Walsh. These two decisions are key because the Supreme Court moved from an equality-based approach in Miron that treats married couples and unmarried couples the same to an autonomy-based approach in Walsh that emphasizes the importance of permitting unmarried partners the freedom to choose a relationship that is not regulated by marriage laws. These cases also reflect some of the arguments in the literature and illustrate how controversial the debate is. By looking at the history of unmarried cohabitation and its sociological background, I argue that equality should prevail over liberty of choice. Often, choice is not the sole parameter in the decision between marriage and unmarried cohabitation and it cannot be said that unmarried cohabiting couples always choose to avoid marital regulations. Furthermore, unmarried cohabiting couples are functionally similar to married couples and should therefore be treated equally from a legal perspective.
Effects of quarks on the formation and evolution of Z(3) walls and strings in relativistic heavy-ion collisions
Creators: name: Gupta, Uma Shankar
name: Mohapatra, Ranjita K.
name: Srivastava, Ajit M.
name: Tiwari, Vivek K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the effects of explicit breaking of Z(3) symmetry due to the presence of dynamical quarks on the formation and evolution of Z(3) walls and associated QGP strings within Polyakov loop model. We carry out numerical simulations of the first order quark-hadron phase transition via bubble nucleation (which may be appropriate, for example, at finite baryon chemical potential) in the context of relativistic heavy-ion collision experiments. Using appropriate shifting of the order parameter in the Polyakov loop effective potential, we calculate the bubble profiles using bounce technique, for the true vacuum as well as for the metastable Z(3) vacua, and estimate the associated nucleation probabilities. These different bubbles are then nucleated and evolved and resulting formation and dynamics of Z(3) walls and QGP strings is studied. We discuss various implications of the existence of these Z(3) interfaces and the QGP strings, especially in view of the effects of the explicit breaking of the Z(3) symmetry on the formation and dynamical evolution of these objects.
description: 17 pages, 9 figures, PDFLatex
Design and analysis of a carrier synchronization system using phase-locked loop
Creators: name: Gharaei, Reza
Publisher: name: Macquarie University
Year: 2023
Subjects: classificationCode: 400607
subject: Signal processing

description: Carrier synchronization in highly dynamic environments can be a challenging problem, particularly in applications where the input signal has a low signal-to-noise ratio (SNR). The Phase Locked Loop (PLL) is a widely used method for extracting the frequency and phase of received signals in both stationary and high dynamic scenarios. However, the PLL's performance is limited by two factors: the trade-off between fast acquisition time and accurate phase extraction, and its poor performance for low SNR signals. To improve the understanding of this problem, this study conducts a review of the mathematical model of the PLL and explains the associated design challenges. After conducting a comprehensive literature review, the proposed solutions are introduced and evaluated. The solutions aimed at resolving the trade-off are classified into two categories: adaptive loop filter and frequency estimation algorithms assisted PLL. Their respective advantages and disadvantages are analysed, and based on this analysis, the frequency estimation algorithms assisted PLL category is selected for further improvement in PLL performance. Coherent integration is identified as the primary solution for low SNR inputs in both categories since the expected received frequency is already known. This study introduces an innovative algorithm for real-time carrier tracking application, which combines a PLL with an accurate and fast frequency estimation algorithm (FFEA) based on the discrete Fourier transform (DFT). The proposed approach addresses the challenge of detecting low SNR signals by incorporating an adaptive DFT-length architecture within the FFEA. By leveraging the carrier frequency information provided by the FFEA, two significant contributions are achieved. Firstly, the signal passing through the PLL is effectively filtered, thereby improving SNR. Secondly, by assuming negligible frequency error for FFEA, the carrier frequency error between the input signal frequency and the VCO output frequency is effectively removed. Therefore, the function of the PLL, which encompasses both phase and frequency acquisition, is simplified to phase acquisition. As a result, the trade-off is greatly mitigated. The proposed design has been implemented in MATLAB, and the results indicate a significant improvement in the performance of the traditional PLL under stationary conditions. Moreover, in high dynamic conditions, the proposed approach achieves a 66 percent reduction in acquisition time compared to the traditional frequency locked loop (FLL)-assisted PLL, with an RMSE of 2.15 Hz at -30dB SNR, while the traditional FLL-assisted PLL had an RMSE of 10.2 Hz at similar conditions. Additionally, the proposed design has been compared with three previously published designs that aim to enhance PLL performance under high dynamic conditions, and the results demonstrate that the proposed approach outperforms all three designs.
A Study of Ni-Substitution Effects on Heavy-Fermion CeCu2Si2 - Similarities between Ni Substitution and High-Pressure Effects -
Creators: name: Ikeda, Yoichi
name: Araki, Shingo
name: Kobayashi, Tatsuo C.
name: Shimizu, Yusei
name: Yanagisawa, Tatsuya
name: Amitsuka, Hiroshi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The effects of Ni substitution on Ce(Cu1-xNix)2Si2 have been studied by specific heat and electrical resistivity measurements. The specific heat measurement has revealed that the enhanced quantum fluctuations around an antiferromagnetic quantum critical point are markedly suppressed by Ni substitution, and that the Fermi liquid state recovers in the Nirich region (x > 0.12). The characteristic T-linear dependence of the resistivity has been observed at approximately x ~ 0.10 together with a sign of superconductivity. The variation of n in the form of rho - rho0 = aT^n against Tmax^1, at which the resistivity peaks, coincides with the case of high-pressure experiments on pure CeCu2Si2. The anomalous T-linear behavior appears to occur in the crossover region from the Kondo regime to the valence fluctuation regime rather than in the conventional antiferromagnetic quantum critical region.
description: 11 pages, 5 figures, to be published (J. Phys. Soc. Jpn)
Applying geocaching principles to site-based citizen science and eliciting reactions via a technology probe
Creators: name: Dunlap, Matthew A.
name: Tang, Anthony Hoi Tin
name: Greenberg, Saul
Publisher: name: Springer
Year: 2015

description: Site-based citizen science occurs when volunteers work with scientists to collect data at particular field locations. The benefit is greater data collection at lesser cost. Yet difficulties exist. We developed ScienceCaching, a prototype citizen science aid designed to mitigate four specific problems by applying aspects from another thriving location-based activity: geocaching as enabled by mobile devices. Specifically, to ease problems in data collection, ScienceCaching treats sites as geocaches: Volunteers find sites opportunistically via geocaching methods and use equipment and other materials pre-stored in cache containers. To ease problems in data validation, ScienceCaching flags outlier data as it is entered so that on-site volunteers can be immediately check and correct data. Additionally, other volunteers are directed to that site at a later time for further readings that provide data redundancy. To ease volunteer training, ScienceCaching directs volunteers to training sites on an as-needed basis, where they are taught and tested against known measures. To ease volunteer coordination, ScienceCaching automatically directs volunteers to particular sites of interest, and real-time communication between volunteers and scientist is enabled as needed. We developed ScienceCaching primarily as a technology probe—a working but quite limited system—to embody these ideas and to evaluate their worthiness by eliciting reactions from scientists involved in citizen science. Scientists saw many opportunities in using fixed location caches and geocaching techniques to aid citizen science. Yet they expanded the discussion. Amongst these, they emphasized practical concerns that must be addressed, and they argued that future systems should carefully consider the role of the social experience—both the “online” experience and the shared physical experience of visiting sites.
Optimal Local Transformations of Flip and Exchange Symmetric Entangled States
Creators: name: Karpat, G.
name: Gedik, Z.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Local quantum operations relating multiqubit flip (0-1) and exchange symmetric (FES) states, with the maximum possible probability of success, have been determined by assuming that the states are converted via one-shot FES transformations. It has been shown that certain entangled states are more robust than others, in the sense that the optimum probability of converting these robust states to the states lying in the close neighborhood of separable ones vanish under local FES operations.
description: 11 pages, 2 figures
Lune Serum
Creators: name: Luneserumthai
Publisher: name: Zenodo
Year: 2020
Subjects: luneserumthai

description: Lune Serum - ถ้าคุณยังไม่ได้เห็นมันหรือได้ยินมันตอนนี้ฉันจะพยายามที่จะให้ทฤษฎีทั่วไปของสิ่งที่มันเป็นทั้งหมดเป็นความกังวลที่ ฉันจะซื้ออะไรแบบนี้จากคุณ แต่ถ้าไม่ใช่ คุณอยู่ในสถานการณ์เดียวกับที่ผมอยู่ตอนนี้ มันเป็นการลดลงของถัง แต่ฉันยังพบทางเลือกในการต่อรองราคาเพื่อใช้มัน ฉันเชื่อมากว่ามันไม่ใช่สิ่งที่ฉันต้องมี นี่เป็นเพียงส่วนเล็ก ๆ ของภูเขาน้ําแข็งแต่ช้ามากเมื่อเร็ว ๆ นี้ นี่มันไม่มีที่สิ้นสุด เห็นได้ชัดว่าเป็นอุปสรรคต่อความพยายามของคุณ ไม่จําเป็นต้องมี axiom ของฉันหรือไม่? ฉันไม่แน่ใจว่ามันจะยั่งยืนหรือไม่ นักเรียนของฉันสามารถมาถึงกลุ่มการอภิปรายที่โดดเด่นได้ที่ไหน ฉันรู้สึกเหมือนเป็นวัวในร้านจีน ปีที่แล้วฉันคุยกับคนที่เลิกใช้มัน ฉันเป็นแฟนอันดับหนึ่ง ด้วยหลักฐานของคุณคุณจะทํางานเพื่อประโยชน์ที่สําคัญ คุณต้องเข้าใจสิ่งนี้: ฉันไม่ได้เบาะแสแรกเกี่ยวกับการพัฒนานั้น มีบางสิ่งที่โปร่งใสที่คุณสามารถทําได้ด้วยการฝึกฝน เราจะหาคําตอบในไม่ช้า พวกเขากําลังจะตั้งค่าพอดแคสต์ส่วนตัว https://www.luneserum.net
Gravitational-wave bursts and stochastic background from superfluid vortex avalanches during pulsar glitches
Creators: name: Warszawski, L.
name: Melatos, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The current-quadrupole gravitational-wave signal emitted during the spin-up phase of a pulsar glitch is calculated from first principles by modeling the vortex dynamics observed in recent Gross-Pitaevskii simulations of pinned, decelerating quantum condensates. Homogeneous and inhomogeneous unpinning geometries, representing creep- and avalanche-like glitches, provide lower and upper bounds on the gravitational wave signal strength respectively. The signal arising from homogeneous glitches is found to scale with the square root of glitch size, whereas the signal from inhomogeneous glitches scales proportional to glitch size. The signal is also computed as a function of vortex travel distance and stellar angular velocity. Convenient amplitude scalings are derived as functions of these parameters. For the typical astrophysical situation, where the glitch duration (in units of the spin period) is large compared to the vortex travel distance (in units of the stellar radius), an individual glitch from an object $1\,\rm{kpc}$ from Earth generates a wave strain of $10^{-24} [(Δω/ω) / 10^{-7}] (ω/10^2 \rm{rad s}^{-1})^3 (Δr / 10^{-2} \rm{m})^{-1}$, where $Δr$ is the average distance travelled by a vortex during a glitch, $Δω/ω$ is the fractional glitch size, and $ω$ is the pulsar angular velocity. The non-detection of a signal from the 2006 Vela glitch in data from the fifth science run conducted by the Laser Interferometer Gravitational-Wave Observatory implies that the glitch duration exceeds $\sim 10^{-4}\,\rm{ms}$. This represents the first observational lower bound on glitch duration to be obtained.
description: Accepted for publication in MNRAS
An empirical study on clone stability
Creators: name: Mondal, Manishankar
name: Roy, Chanchal K.
name: Schneider, Kevin A.
Publisher: name: ACM
Year: 2012

description: Code cloning is a controversial software engineering practice due to contradictory claims regarding its effect on software maintenance. Code stability is a recently introduced measurement technique that has been used to determine the impact of code cloning by quantifying the changeability of a code region. Although most existing stability analysis studies agree that cloned code is more stable than non-cloned code, the studies have two major flaws: (i) each study only considered a single stability measurement (e.g., lines of code changed, frequency of change, age of change); and, (ii) only a small number of subject systems were analyzed and these were of limited variety. In this paper, we present a comprehensive empirical study on code stability using four different stability measuring methods. We use a recently introduced hybrid clone detection tool, NiCAD, to detect the clones and analyze their stability in different dimensions: by clone type, by measuring method, by programming language, and by system size and age. Our in-depth investigation on 12 diverse subject systems written in three programming languages considering three types of clones reveals that: (i) cloned code is generally less stable than non-cloned code, and more specifically both Type-1 and Type-2 clones show higher instability than Type-3 clones; (ii) clones in both Java and C systems exhibit higher instability compared to the clones in C# systems; (iii) a system's development strategy might play a key role in defining its comparative code stability scenario; and, (iv) cloned and non-cloned regions of a subject system do not follow any consistent change pattern.
Photoionization models of the Eskimo nebula: evidence for a binary central star?
Creators: name: Danehkar, Ashkbiz
name: Frew, David J.
name: Parker, Quentin A.
name: De Marco, Orsola
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The ionizing star of the planetary nebula NGC 2392 is too cool to explain the high excitation of the nebular shell, and an additional ionizing source is necessary. We use photoionization modeling to estimate the temperature and luminosity of the putative companion. Our results show it is likely to be a very hot (Teff ~ 250kK), dense white dwarf. If the stars form a close binary, they may merge within a Hubble time, possibly producing a Type Ia supernova.
description: 2 pages, 1 figure, presented at the IAU Symposium 282 "From Interacting Binaries to Exoplanets: Essential Modeling Tools", Tatransk\'a Lomnica, Slovakia, 2011
title: ”Digitale Fachdidaktiken“ in den Kulturwissenschaften : Einführende Bemerkungen an Stelle eines Vorworts
Creators: name: Schenk, Gerrit Jasper
name: Rapp, Andrea
name: Bender, Michael
Publisher: name: UNSPECIFIED
Year: 2020

description: Der Beitrag stellt vor, was im vorliegenden Band unter „digitaler Fachdidaktik“ in den textbasierten Kulturwissenschaften verstanden wird. Er diskutiert die Chancen und Gefahren des Einsatzes digitaler Werkzeuge in der schulischen und universitären Lehre. Er macht deutlich, dass der Einsatz digitaler Mittel nicht nur auf bereits etablierten Feldern wie der Begriffsgeschichte und Diskursanalyse sinnvoll ist, sondern auch neue Forschungsfelder erschließt. Digitalität verbindet benachbarte Disziplinen und ermöglicht einen Brückenschlag zu entfernteren Disziplinen wie den Natur- und Technikwissenschaften. Der Einsatz der Mittel fordert dazu heraus, neu über fachdidaktische Fragen von der didaktischen Analyse als Kern der Vorbereitung auf den eigentlichen Vermittlungsakt über Komplexitätsreduktionen bis hin zum forschenden Lernen in kollaborativen Prozessen nachzudenken. Welche Grenzen besitzen quantitative Zugänge? Welche Kompetenzen sind aus fachdidaktischer Sicht besonders wichtig, welches Methodeninventar steht zur Verfügung? Welche spezifischen Herausforderungen stellen sich durch die Digitalität, vom Zwang zur Konkretion und Standardisierung über das Denken in algorithmischen und iterativen Prozessen bis hin zur Modellbildung? Gefragt wird aus rezeptionsorientierter Perspektive nach Techniken, Praktiken und Programmen der entstehenden „Digital Humanities“, aus der Produktionsperspektive nach Formen des Wissenstransfers für die digitale Erstellung und Bearbeitung von Inhalten.
Ivermectin for Covid-19
Creators: name: Sparavigna, Amelia Carolina
Publisher: name: Zenodo
Year: 2020
Subjects: Covid-19
Ivermectin
Hydroxychloroquine
Doxycycline

description: Discussion of scholar papers published until June 27, 2020, on Ivermectin, and of news that we can find about its use for Covid-19. A list of clinical trials is also given. For what concerns scholar papers, we report among them a preprint posted on 10 June in MedRχiv, which concludes that Ivermectin was associated with lower mortality during treatment of Covid-19. From news, we consider in particular the case of Iquitos, capital city of the Loreto Region in Peru, where, by May 25, Covid-19 cases and deaths had dropped notably.
description: Before reading this work, please consider that I am not a physician. I do not suggest the use of ivermectin. I am not touting this drug. This analysis of publications and news about ivermectin is made in the framework of a wider investigation about information concerning drugs used for Covid-19.
Evaluation of optimized staffing for feature development and bug fixing
Creators: name: Rahman, Md. Mainur
name: Sohan, S.M.
name: Maurer, Frank
name: Ruhe, Guenther
Publisher: name: ACM
Year: 2010

description: Skill level and productivity varies substantially between developers. In current staffing practices, however, developers are largely treated as the same. In this paper, an empirical analysis of the tow formulations of assignment of developers to tasks and bug fixing activities is studied. Two related problems are considered: (i) Assignment of developers to bug fixing with the objective to achieve best match between requested skill profile and assigned developer's skill profile. (ii) Assignment of developers to feature-related tasks in iterative development process. Two optimization approaches have been customized to determine qualified staffing plans. They are based on greedy optimization respectively genetic algorithm (GA). Empirical analysis is done for nine milestones of the open source Eclipse JDT project and two industrial case study projects. The main conclusion drawn from the analysis is that substantial savings can be achieved from optimized staffing policies when compared to the manual plans formerly applied. More specifically, the GA results are mostly the best, and the (lightweight) Greedy search becomes the better the bigger the look-ahead time L. Overall, the results are considered as decision support in finding better staffing policies in shorter time.
Heights of divisors of x^n-1
Creators: name: Thompson, Lola
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: The height of a polynomial with integer coefficients is the largest coefficient in absolute value. Many papers have been written on the subject of bounding heights of cyclotomic polynomials. One result, due to H. Maier, gives a best possible upper bound of n^{ψ(n)} for almost all n, where ψ(n) is any function that approaches infinity as n tends to infinity. We will discuss the related problem of bounding the maximal height over all polynomial divisors of x^n - 1 and give an analogue of Maier's result in this scenario.
description: 8 pages
Development and Performance Verification of the GANDALF High-Resolution Transient Recorder System
Creators: name: Bartknecht, Stefan
name: Fischer, Horst
name: Herrmann, Florian
name: Königsmann, Kay
name: Lauser, Louis
name: Schill, Christian
name: Schopferer, Sebastian
name: Wollny, Heiner
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: With present-day detectors in high energy physics one often faces fast analog pulses of a few nanoseconds length which cover large dynamic ranges. In many experiments both amplitude and timing information have to be measured with high accuracy. Additionally, the data rate per readout channel can reach several MHz, which leads to high demands on the separation of pile-up pulses. For an upgrade of the COMPASS experiment at CERN we have designed the GANDALF transient recorder with a resolution of 12bit@1GS/s and an analog bandwidth of 500\:MHz. Signals are digitized with high precision and processed by fast algorithms to extract pulse arrival times and amplitudes in real-time and to generate trigger signals for the experiment. With up to 16 analog channels, deep memories and a high data rate interface, this 6U-VME64x/VXS module is not only a dead-time free digitization unit but also has huge numerical capabilities provided by the implementation of a Virtex5-SXT FPGA. Fast algorithms implemented in the FPGA may be used to disentangle possible pile-up pulses and determine timing information from sampled pulse shapes with a time resolution better than 50 ps.
description: 5 pages, 9 figures
Modeling the foraging habitat of humpback whales
Creators: name: Dalla Rosa, Luciano
Publisher: name: University of British Columbia
Year: 2010

description: Knowing how species will respond to environmental variability and climate change requires understanding the factors that influence their distribution and movement patterns. I investigated the processes that drive individuals to concentrate in specific areas of their home range by modeling encounter rates of humpback whales (Megaptera novaeangliae) in relation to environmental variables using GIS tools, generalized additive models, and remote sensing and in situ data. I conducted this work at two foraging areas: the coastal waters of British Columbia, Canada, and the Bransfield and Gerlache Straits, Antarctica. Humpback whales in British Columbia were strongly associated with latitude and bathymetric features. The relationships with remotely sensed variables reflecting primary productivity were not consistent, but higher numbers of whales seemed to be associated with higher productivity. In fact, the highest concentrations of humpback whales appeared to reflect areas where concentration and retention processes lead to higher biological productivity, including south Dixon Entrance, middle and southwestern Hecate Strait and off Juan de Fuca Strait. Humpback whales in the Southern Ocean also preferred areas of enhanced biological productivity. In Gerlache Strait, humpback whales were associated with areas of higher chlorophyll-a concentration in the central and northern sections of the strait, which also corresponded to relatively higher temperatures and shallower mixed layer depths for the in situ data. In Bransfield Strait, humpback whales appeared to prefer the near-frontal zones and the deep basins, where surface waters are influenced by the Bransfield Current. Interannual variability in both humpback and minke whale encounter rates in Gerlache Strait was correlated with the Oceanic Niño Index, the oceanic component of ENSO. In addition to investigating species-habitat relationships with statistical models, I conducted the first study to describe the satellite-monitored movements of humpback whales on their feeding grounds along the Antarctic Peninsula. Results showed considerable individual variation in direction, speed and range of movements, and an overall pattern characterized by short- and long-distance movements between presumed foraging areas with relatively short residency times. All told, the results of my research show that humpback whale distribution within foraging habitat is influenced by physical and biological variables that enhance biological productivity.
title: Exploring Churchill’s political speeches : The case for digitality in interdisciplinary linguistics and history teaching
Creators: name: Bartsch, Sabine
name: Mares, Detlev
Publisher: name: UNSPECIFIED
Year: 2020

description: Interdisciplinary didactic concepts can greatly benefit from digitality as a facilitator of interdisciplinary teaching and learning. This paper presents an interdisciplinary digital teaching concept on British Political Speeches; it is based on a course held with an interdisciplinary group of teachers and students from history and linguistics in an undergraduate course at Technische Universität Darmstadt. Explorations of the rhetoric of political speeches may start off from either linguistic or historical questions; combining both with digitality as a facilitator can lead to students’ deeper engagement with political rhetoric from an interdisciplinary perspective.
Concern-Oriented Software Design
Creators: name: Alam, Omar
name: Kienzle, Jorg
name: Mussbacher, Gunter
Publisher: name: Springer
Year: 2013

description: There exist many solutions to solve a given design problem, and it is difficult to capture the essence of a solution and make it reusable for future designs. Furthermore, many variations of a given solution may exist, and choosing the best alternative depends on application-specific high-level goals and non-functional requirements. This paper proposes Concern-Oriented Software Design, a modelling technique that focuses on concerns as units of reuse. A concern groups related models serving the same purpose, and provides three interfaces to facilitate reuse. The variation interface presents the design alternatives and their impact on non-functional requirements. The customization interface of the selected alternative details how to adapt the generic solution to a specific context. Finally, the usage interface specifies the provided behaviour. We illustrate our approach by presenting the concern models of variations of the Observer design pattern, which internally depends on the Association concern to link observers and subjects.
Bubbles of congruent primes
Creators: name: Thorne, Frank
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Shiu proved that if a and q are arbitrary coprime integers, then there exist arbitrarily long strings of consecutive primes which are all congruent to a modulo q. We generalize Shiu's theorem to imaginary quadratic fields, where we prove the existence of "bubbles" containing arbitrarily many primes which are all, up to units, congruent to a modulo q.
description: 16 pages. A somewhat old paper, recently revised
Evaluation of Interactive Segmentation Algorithms Using Densely Sampled Correct Interactions
Creators: name: Haque, S.M. Rafizul
name: Eramian, Mark G.
name: Schneider, Kevin A.
Publisher: name: Springer
Year: 2013

description: The accuracy and reproducibility of semiautomatic interactive segmentation algorithms are typically evaluated using only a small number of human observers which only considers a very small number of the possible correct interactions that an observer might provide. A correct interaction is one that provides contextual information that would be expected to result in a correct segmentation. In this paper, we demonstrate new evaluation methods for semiautomatic interactive segmentation algorithms that employ simulated observer models constructed from a large number of segmentations computed by uniformly sampling the entire set of possible correct interactions. The advantages of this method are that it is free of observer biases and the large number of segmentations produced for each object of interest to be segmented allow a range of statistical methods to be brought to bear on the analysis of segmentation algorithm performance. The methods are demonstrated using a semi-automated segmentation algorithm for ovarian follicles in ultrasonographic images.
The origin of order in random matrices with symmetries
Creators: name: Johnson, Calvin W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: From Noether's theorem we know symmetries lead to conservation laws. What is left to nature is the ordering of conserved quantities; for example, the quantum numbers of the ground state. In physical systems the ground state is generally associated with `low' quantum numbers and symmetric, low-dimensional irreps, but there is no \textit{a priori} reason to expect this. By constructing random matrices with nontrivial point-group symmetries, I find the ground state is always dominated by extremal low-dimensional irreps. Going further, I suggest this explains the dominance of J=0 g.s. even for random two-body interactions.
description: 5 figures; contribution to "Beauty in Physics" conference in honor of Francesco Iachello, May 2012, Cocoyoc, Mexico