cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
YAP/TAZ initiate and maintain schwann cell myelination
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: Egr2
Schwann cells
TEAD
Taz
demyelination
mouse
neuroscience
Adaptor Proteins, Signal Transducing
Animals
Cell Cycle Proteins
Cell Differentiation
Cell Proliferation
Mice
Myelin Sheath
Phosphoproteins
Schwann Cells
Transcription Factors

description: © Grove et al. Nuclear exclusion of the transcriptional regulators and potent oncoproteins, YAP/TAZ, is considered necessary for adult tissue homeostasis. Here we show that nuclear YAP/TAZ are essential regulators of peripheral nerve development and myelin maintenance. To proliferate, developing Schwann cells (SCs) require YAP/TAZ to enter S-phase and, without them, fail to generate sufficient SCs for timely axon sorting. To differentiate, SCs require YAP/TAZ to upregulate Krox20 and, without them, completely fail to myelinate, resulting in severe peripheral neuropathy. Remarkably, in adulthood, nuclear YAP/TAZ are selectively expressed by myelinating SCs, and conditional ablation results in severe peripheral demyelination and mouse death. YAP/ TAZ regulate both developmental and adult myelination by driving TEAD1 to activate Krox20. Therefore, YAP/TAZ are crucial for SCs to myelinate developing nerve and to maintain myelinated nerve in adulthood. Our study also provides a new insight into the role of nuclear YAP/TAZ in homeostatic maintenance of an adult tissue.
Features due to spin-orbit coupling in the optical conductivity of single-layer graphene
Creators: name: Ingenhoven, P.
name: Bernad, J. Z.
name: Zuelicke, U.
name: Egger, R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have calculated the optical conductivity of a disorder-free single graphene sheet in the presence of spin-orbit coupling, using the Kubo formalism. Both intrinsic and structural-inversion-asymmetry induced types of spin splitting are considered within a low-energy continuum theory. Analytical results are obtained that allow us to identify distinct features arising from spin-orbit couplings. We point out how optical-conductivity measurements could offer a way to determine the strengths of spin splitting due to various origins in graphene.
description: 7 pages, 5 figures, RevTex4; v2: added/updated references, changed figures, extended Introduction section; to appear in PRB
Effect of low electric fields on alpha scintillation light yield in liquid argon
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: Time projection chambers
Large detector systems for particle and astroparticle physics
Dark Matter detectors (WIMPs, axions, etc.)

description: © 2017 IOP Publishing Ltd and Sissa Medialab srl. Measurements were made of scintillation light yield of alpha particles from the 222Rn decay chain within the DarkSide-50 liquid argon time projection chamber. The light yield was found to increase as the applied electric field increased, with alphas in a 200 V/cm electric field exhibiting a ∼2% increase in light yield compared to alphas in no field.
Noise in the wire: the real impact of wire resistance for the Johnson (-like) noise based secure communicator
Creators: name: Kish, Laszlo B.
name: Scheuer, Jacob
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Physics (physics.class-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We re-evaluate the impact of wire resistance on the noise voltage and current in the Johnson-(like)-noise based secure communicator, correcting the result presented in [Physics Letters A 359 (2006) 737]. The analysis shown here is based on the fluctuation-dissipation and the linear response theorems. The results indicate that the impact of wire resistance in practical communicators is significantly lower than the previous estimation.
description: Accepted for publication in Physics Letters A, on March 10, 2010
Ultralong 100 ns Spin Relaxation Time in Graphite at Room Temperature
Creators: name: Márkus, B. G.
name: Gmitra, M.
name: Dóra, B.
name: Csősz, G.
name: Fehér, T.
name: Szirmai, P.
name: Náfrádi, B.
name: Zólyomi, V.
name: Forró, L.
name: Fabian, J.
name: Simon, F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphite has been intensively studied, yet its electron spins dynamics remains an unresolved problem even 70 years after the first experiments. The central quantities, the longitudinal ($T_1$) and transverse ($T_2$) relaxation times were postulated to be equal, mirroring standard metals, but $T_1$ has never been measured for graphite. Here, based on a detailed band structure calculation including spin-orbit coupling, we predict an unexpected behavior of the relaxation times. We find, based on saturation ESR measurements, that $T_1$ is markedly different from $T_2$. Spins injected with perpendicular polarization with respect to the graphene plane have an extraordinarily long lifetime of $100$ ns at room temperature. This is ten times more than in the best graphene samples. The spin diffusion length across graphite planes is thus expected to be ultralong, on the scale of $\sim 70~μ$m, suggesting that thin films of graphite -- or multilayer AB graphene stacks -- can be excellent platforms for spintronics applications compatible with 2D van der Waals technologies. Finally, we provide a qualitative account of the observed spin relaxation based on the anisotropic spin admixture of the Bloch states in graphite obtained from density functional theory calculations.
Ergodic Capacity Analysis of Amplify-and-Forward MIMO Dual-Hop Systems
Creators: name: Jin, Shi
name: McKay, Matthew R.
name: Zhong, Caijun
name: Wong, Kai-Kit
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper presents an analytical characterization of the ergodic capacity of amplify-and-forward (AF) MIMO dual-hop relay channels, assuming that the channel state information is available at the destination terminal only. In contrast to prior results, our expressions apply for arbitrary numbers of antennas and arbitrary relay configurations. We derive an expression for the exact ergodic capacity, simplified closed-form expressions for the high SNR regime, and tight closed-form upper and lower bounds. These results are made possible to employing recent tools from finite-dimensional random matrix theory to derive new closed-form expressions for various statistical properties of the equivalent AF MIMO dual-hop relay channel, such as the distribution of an unordered eigenvalue and certain random determinant properties. Based on the analytical capacity expressions, we investigate the impact of the system and channel characteristics, such as the antenna configuration and the relay power gain. We also demonstrate a number of interesting relationships between the dual-hop AF MIMO relay channel and conventional point-to-point MIMO channels in various asymptotic regimes.
description: 40 pages, 9 figures, Submitted to to IEEE Transactions on Information Theory
A QPSK 110-Gb/s Polarization-Diversity MIMO Wireless Link with a 220-255 GHz Tunable LO in a SiGe HBT Technology
Creators: name: Rodríguez-Vázquez, Pedro
name: Grzyb, Janusz
name: Heinemann, Bernd
name: Pfeiffer, Ullrich R.
Publisher: name: New York, NY : IEEE
Year: 2020
Subjects: subject: Circular polarization
subject: high-speed terahertz communication
subject: multiple-inputs multiple-outputs (MIMO) communication
subject: polarization-diversity antenna
subject: quadrature phase-shift keying (QPSK)
subject: SiGe HBT
subject: 620

description: In this article, a polarization-diversity technique multiple-input multiple-output (MIMO) is demonstrated to double the spectral efficiency of a line-of-sight quadrature phase-shift keying (QPSK) wireless link at 220-255 GHz with a pair of highly integrated single-chip transmitter (TX) and receiver (RX) front-end modules in 0.13-µ {m SiGe HBT technology ( fTmax=350 /550 GHz) exploiting only a low-cost wire-bonded chip-on-board packaging solution for high-speed baseband (BB) signals. Both TX and RX chips accommodate two independent fundamentally operated direct-conversion in-phase and quadrature (IQ) paths with separately tunable on-chip multiplier-based ( × 16 ) local oscillator (LO) generation paths driven from a single external highly stable 13.75-16-GHz frequency synthesizer. On the RX side, a mixer-first architecture is implemented to improve the symmetry between upper and lower sidebands (USB and LSB) at the cost of an increased noise figure (NF), whereas, on the TX chip, each upconversion mixer is followed by a gain-bandwidth (BW)-limited four-stage power amplifier (PA) to support the link budget at a meter distance. Next, two independent IQ data streams from the upconversion/downconversion paths on each chip are directed to a common lens-coupled broadband on-chip slot antenna system. This way, two orthogonal circular polarizations [left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP)] can be transmitted with sufficient isolation for link operation without the need for a high-speed depolarizer in the BB for any relative orientation between TX and RX modules. The antenna combined with a 9-mm diameter Si-lens provides a directivity of 23.5-27 dBi at 210-270 GHz for each of the modules. This, along with a peak radiated power of 7.5 dBm/ch from the TX module, and the cascaded conversion gain (CG)/single sideband (SSB) NF of 18/18 dB/ch for the RX module followed by a broadband amplifier (PSPL5882) from Tektronix allowed successful transmission of two independent QPSK data streams with an aggregate speed of 110 and 80 Gb/s over 1 and 2 m, respectively, at 230 GHz with a board-level limited channel BB bandwidth (BW) of 13.5 GHz. © 1963-2012 IEEE.
A Bottom-Up Approach to SUSY Analyses
Creators: name: Horn, Claus
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: This paper proposes a new way to do event generation and analysis in searches for new physics at the LHC. An abstract notation is used to describe the new particles on a level which better corresponds to detector resolution of LHC experiments. In this way the SUSY discovery space can be decomposed into a small number of eigenmodes each with only a few parameters, which allows to investigate the SUSY parameter space in a model-independent way. By focusing on the experimental observables for each process investigated the Bottom-Up Approach allows to systematically study the boarders of the experimental efficiencies and thus to extend the sensitivity for new physics.
description: 12 pages
Induced interactions and the superfluid transition temperature in a three-component Fermi gas
Creators: name: Martikainen, J. -P.
name: Kinnunen, J. J.
name: Torma, P.
name: Pethick, C. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study many-body contributions to the effective interaction between fermions in a three-component Fermi mixture. We find that effective interactions induced by the third component can lead to a phase diagram different from that predicted if interactions with the third component are neglected. As a result, in a confining potential a superfluid shell structure can arise even for equal populations of the components. We also find a critical temperature for the BCS transition in a 6Li mixture which can deviate strongly from the one in a weakly interacting two-component system.
description: 4 pages, 5 figures
Inter-Layer Coupling Induced Valence Band Edge Shift in Mono- to Few-Layer MoS 2
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017

description: © The Author(s) 2017. Recent progress in the synthesis of monolayer MoS 2, a two-dimensional direct band-gap semiconductor, is paving new pathways toward atomically thin electronics. Despite the large amount of literature, fundamental gaps remain in understanding electronic properties at the nanoscale. Here, we report a study of highly crystalline islands of MoS 2 grown via a refined chemical vapor deposition synthesis technique. Using high resolution scanning tunneling microscopy and spectroscopy (STM/STS), photoemission electron microscopy/spectroscopy (PEEM) and μ-ARPES we investigate the electronic properties of MoS 2 as a function of the number of layers at the nanoscale and show in-depth how the band gap is affected by a shift of the valence band edge as a function of the layer number. Green's function based electronic structure calculations were carried out in order to shed light on the mechanism underlying the observed bandgap reduction with increasing thickness, and the role of the interfacial Sulphur atoms is clarified. Our study, which gives new insight into the variation of electronic properties of MoS 2 films with thickness bears directly on junction properties of MoS 2, and thus impacts electronics application of MoS 2.
Charge-Dependent Directed Flow in Cu+Au Collisions at sNN =200 GeV
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: STAR Collaboration

description: © 2017 American Physical Society. We present the first measurement of charge-dependent directed flow in Cu+Au collisions at sNN=200 GeV. The results are presented as a function of the particle transverse momentum and pseudorapidity for different centralities. A finite difference between the directed flow of positive and negative charged particles is observed that qualitatively agrees with the expectations from the effects of the initial strong electric field between two colliding ions with different nuclear charges. The measured difference in directed flow is much smaller than that obtained from the parton-hadron-string-dynamics model, which suggests that most of the electric charges, i.e., quarks and antiquarks, have not yet been created during the lifetime of the strong electric field, which is of the order of, or less than, 1 fm/c.
title: The Value of Instructor Interactivity in the Online Classroom
Creators: name: Lucas, Greg
name: Cao, Gary
name: Waltemeyer, Shaunna
name: Mandernach, B. Jean
name: Hammond, Helen G
Publisher: name: Utah State University
Year: 2021

description: As the number of faculty teaching online continues to grow, so has the interest in and understanding of the role of instructor interaction in the online classroom. Online education provides a unique platform in which course design and teaching are independent factors. Understanding faculty and student perceptions about the shifting role of instructor interaction in the online classroom can provide insight on policies and procedures that can support student learning through student-instructor interaction.  Participants included faculty and students responding to an anonymous online survey who indicated “online” as their primary mode of teaching. Three key “value” themes emerged as significantly valuable: instructor interactivity, instructor feedback on participation, and asynchronous interaction in discussion forums. These findings illuminate opportunities and areas of consideration for three stakeholders in the student-teacher interaction equation: faculty, faculty developers, and administrators that can be used to inform quality online teaching through instructor interactivity.
title: Through the Eyes of the Mentor: Understanding the Adolescent Developing Reader
Creators: name: Weaver, Joanna C.
name: Bertelsen, Cynthia D.
name: Murnen, Timothy
name: Glanz, Jessica N.
Publisher: name: Utah State University
Year: 2021

description: While some teacher candidates may believe reading instruction is the responsibility of English teachers, providing teacher candidates across all content areas with opportunities to develop skills working with developing readers may impact this misconception. Since some teacher candidates have limited experience, confidence, and/or reading strategies to instruct developing readers, this study examines the individual experiences of reading mentors at a midwestern university and the effect of their experience on developing readers. This mentoring experience revealed an impact both for the teacher candidates and developing readers. This opportunity proved to be rewarding while providing a glimpse of the reality of working with developing readers in teacher candidates’ future classrooms.
A simple high-sensitivity technique for purity analysis of xenon gas
Creators: name: Leonard, D. S.
name: Dobi, A.
name: Hall, C.
name: Kaufman, L.
name: Langford, T.
name: Slutsky, S.
name: Yen, Y. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We report on the development and performance of a high-sensitivity purity-analysis technique for gaseous xenon. The gas is sampled at macroscopic pressure from the system of interest using a UHV leak valve. The xenon present in the sample is removed with a liquid-nitrogen cold trap, and the remaining impurities are observed with a standard vacuum mass-spectroscopy device. Using calibrated samples of xenon gas spiked with known levels of impurities, we find that the minimum detectable levels of N2, O2, and methane are 1 ppb, 160 ppt, and 60 ppt respectively. This represents an improvement of about a factor of 10,000 compared to measurements performed without a coldtrap.
description: 20 pages, 5 figures
title: Pivoting at the Midpoint: How Midpoint Course Adjustments Influence Student Engagement
Creators: name: Romney, Alexander C
name: Pound, Mitchell
Publisher: name: Utah State University
Year: 2021

description: In higher education, instructors must often pivot to new methods, approaches, and exercises to help students achieve learning objectives in a particular course. These course pivots can be challenging to navigate; however, they are often the difference between a successful course and an unsuccessful one. Research on the punctuated equilibrium model of group development provides important insights for instructors on managing and navigating course pivots. This article reviews research on midpoint transitions and discusses the benefits of implementing midpoint pivots. It then introduces an example of a midpoint course pivot: The Stop-Start-Continue exercise. It concludes with a discussion of the implications this exercise has for instructors and students alike.
Deep Learning-enabled MCMC for Probabilistic State Estimation in District Heating Grids
Creators: name: Bott, Andreas
name: Janke, Tim
name: Steinke, Florian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: Systems and Control (eess.SY)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: I.6.4
subject: 62G05

description: Flexible district heating grids form an important part of future, low-carbon energy systems. We examine probabilistic state estimation in such grids, i.e., we aim to estimate the posterior probability distribution over all grid state variables such as pressures, temperatures, and mass flows conditional on measurements of a subset of these states. Since the posterior state distribution does not belong to a standard class of probability distributions, we use Markov Chain Monte Carlo (MCMC) sampling in the space of network heat exchanges and evaluate the samples in the grid state space to estimate the posterior. Converting the heat exchange samples into grid states by solving the non-linear grid equations makes this approach computationally burdensome. However, we propose to speed it up by employing a deep neural network that is trained to approximate the solution of the exact but slow non-linear solver. This novel approach is shown to deliver highly accurate posterior distributions both for classic tree-shaped as well as meshed heating grids, at significantly reduced computational costs that are acceptable for online control. Our state estimation approach thus enables tightening the safety margins for temperature and pressure control and thereby a more efficient grid operation.
description: The code for this paper is available under https://github.com/EINS-TUDa/DNN_MCMC4DH
Thermodynamics of amide+amine mixtures. 5. Excess molar enthalpies of N,N-dimethylformamide or N,N-dimethylacetamide+N-propylpropan-1-amine, +N-butylbutan-1-amine, +butan-1-amine, or +hexan-1-amine systems. ERAS results
Creators: name: Hevia, Fernando
name: Ballerat-Busserolles, Karine
name: Coulier, Yohann
name: Coxam, Jean-Yves
name: González, Juan Antonio
name: de la Fuente, Isaías García
name: Cobos, José Carlos
Publisher: name: arXiv
Year: 2024
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Excess molar enthalpies, $H_{\text{m}}^{\text{E}}$, over the whole composition range have been determined for the liquid mixtures N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMA) + butan-1-amine (BA), or + hexan-1-amine (HxA), or + N-propylpropan-1-amine (DPA), or N-butylbutan-1-amine (DBA) at 298.15 K and at 0.1 MPa using a BT2.15 calorimeter from Setaram adapted to work in dynamic mode at constant temperature and pressure. All the $H_{\text{m}}^{\text{E}}$ values are positive, indicating that interactions between like molecules are predominant. The replacement of DMF by DMA in systems with a given amine leads to lower $H_{\text{m}}^{\text{E}}$ results, which have been ascribed to stronger amide-amide interactions in DMF mixtures. The replacement of HxA by DPA in systems with a given amide leads to slightly higher $H_{\text{m}}^{\text{E}}$ values, as interactions between unlike molecules are weaker for the latter. Structural effects in the investigated solutions are also present, since the corresponding excess molar volumes ($V_{\text{m}}^{\text{E}}$), previously determined, are negative or slightly positive. The systems have been characterized in terms of the ERAS model reporting the interaction parameters. The model correctly describes both $H_{\text{m}}^{\text{E}}$ and $V_{\text{m}}^{\text{E}}$. The application of the model suggests that, in the systems under study, solvation effects are of minor importance and that physical interactions are dominant.
Minimum redundancy maximum relevance feature selection approach for temporal gene expression data
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: Feature selection
Gene expression
Temporal data

description: © 2017 The Author(s). Background: Feature selection, aiming to identify a subset of features among a possibly large set of features that are relevant for predicting a response, is an important preprocessing step in machine learning. In gene expression studies this is not a trivial task for several reasons, including potential temporal character of data. However, most feature selection approaches developed for microarray data cannot handle multivariate temporal data without previous data flattening, which results in loss of temporal information. We propose a temporal minimum redundancy - maximum relevance (TMRMR) feature selection approach, which is able to handle multivariate temporal data without previous data flattening. In the proposed approach we compute relevance of a gene by averaging F-statistic values calculated across individual time steps, and we compute redundancy between genes by using a dynamical time warping approach. Results: The proposed method is evaluated on three temporal gene expression datasets from human viral challenge studies. Obtained results show that the proposed method outperforms alternatives widely used in gene expression studies. In particular, the proposed method achieved improvement in accuracy in 34 out of 54 experiments, while the other methods outperformed it in no more than 4 experiments. Conclusion: We developed a filter-based feature selection method for temporal gene expression data based on maximum relevance and minimum redundancy criteria. The proposed method incorporates temporal information by combining relevance, which is calculated as an average F-statistic value across different time steps, with redundancy, which is calculated by employing dynamical time warping approach. As evident in our experiments, incorporating the temporal information into the feature selection process leads to selection of more discriminative features.
Opening Size E ects on Airflow Pattern and Airflow Rate of a Naturally Ventilated Dairy Building : A CFD Study
Creators: name: Saha, Chayan Kumer
name: Yi, Qianying
name: Janke, David
name: Hempel, Sabrina
name: Amon, Barbara
name: Amon, Thomas
Publisher: name: Basel : MDPI
Year: 2020
Subjects: subject: Airflow
subject: CFD
subject: Cow barns
subject: Natural ventilation
subject: Ventilation openings
subject: 600

description: Airflow inside naturally ventilated dairy (NVD) buildings is highly variable and difficult to understand due to the lack of precious measuring techniques with the existing methods. Computational fluid dynamics (CFD) was applied to investigate the effect of different seasonal opening combinations of an NVD building on airflow patterns and airflow rate inside the NVD building as an alternative to full scale and scale model experiments. ANSYS 2019R2 was used for creating model geometry, meshing, and simulation. Eight ventilation opening combinations and 10 different reference air velocities were used for the series of simulation. The data measured in a large boundary layer wind tunnel using a 1:100 scale model of the NVD building was used for CFD model validation. The results show that CFD using standard k-ε turbulence model was capable of simulating airflow in and outside of the NVD building. Airflow patterns were different for different opening scenarios at the same external wind speed, which may affect cow comfort and gaseous emissions. Guiding inlet air by controlling openings may ensure animal comfort and minimize emissions. Non-isothermal and transient simulations of NVD buildings should be carried out for better understanding of airflow patterns.
Algodoo for Online Education: Impulse and Momentum Activities
Creators: name: Coban, Atakan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics Education (physics.ed-ph)
subject: Computers and Society (cs.CY)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: During the periods of sudden transition to online education, the opportunity to make applications that might attract students' attention to the course has decreased even more. Although this deficiency was tried to be eliminated with videos and simulations, it was not possible to ensure active participation of students in some cases. In this study, the Algodoo program, which can increase the efficiency of the teaching environment by ensuring active participation of students in online lessons and the applications that can be done about Impulse and momentum are explained in detail. A total of 6 different applications were carried out, 1 related to the subject of impulse, 1 related to the momentum, 2 related to the relationship between impulse and momentum change, and 2 related to momentum conservation. At the same time, while developing these applications, the adjustments made on the simulation and the reasons are explained in detail. In this way, both the introduction of the program and the sample application suggestion were presented. The values obtained as a result of the applications were calculated and compared both theoretically and on simulation in different ways. As a result, it has been observed that the values have internal consistency with each other and are also compatible with theoretical calculations. Algodoo program, which allows many interactive applications and can be downloaded for free, is a program that can be used both in lecturing and evaluation processes in physics lessons while online education process.
description: 7 pages, published article
Interference of heavy holes in an Aharonov-Bohm ring
Creators: name: Stepanenko, Dimitrije
name: Lee, Minchul
name: Burkard, Guido
name: Loss, Daniel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the coherent transport of heavy holes through a one-dimensional ring in the presence of spin-orbit coupling. Spin-orbit interaction of holes, cubic in the in-plane components of momentum, gives rise to an angular momentum dependent spin texture of the eigenstates and influences transport. We analyze the dependence of the resulting differential conductance of the ring on hole polarization of the leads and the signature of the textures in the Aharonov-Bohm oscillations when the ring is in a perpendicular magnetic field. We find that the polarization-resolved conductance reveals whether the dominant spin-orbit coupling is of Dresselhaus or Rashba type, and that the cubic spin-orbit coupling can be distinguished from the conventional linear coupling by observing the four-peak structure in the Aharonov-Bohm oscillations.
description: 12 pages, 11 figures
Dynamic Incentives for Optimal Control of Competitive Power Systems
Creators: name: Kölsch, Lukas
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2022

description: Technologisch herausfordernde Transformationsprozesse wie die Energiewende können durch passende Anreizsysteme entscheidend beschleunigt werden. Ziel solcher Anreize ist es hierbei, ein Umfeld idealerweise so zu schaffen, dass das Zusammenspiel aller aus Sicht der beteiligten Wettbewerber individuell optimalen Einzelhandlungen auch global optimal im Sinne eines übergeordneten Großziels ist. Die vorliegende Dissertation schafft einen regelungstechnischen Zugang zur Frage optimaler Anreizsysteme für heutige und zukünftige Stromnetze im Zieldreieck aus Systemstabilität, ökonomischer Effizienz und Netzdienlichkeit. Entscheidende Neuheit des entwickelten Ansatzes ist die Einführung zeitlich wie örtlich differenzierter Echtzeit-Preissignale, die sich aus der Lösung statischer und dynamischer Optimierungsprobleme ergeben. Der Miteinbezug lokal verfügbarer Messinformationen, die konsequente Mitmodellierung des unterlagerten physikalischen Netzes inklusive resistiver Verluste und die durchgängig zeitkontinuierliche Formulierung aller Teilsysteme ebnen den Weg von einer reinen Anreiz-Steuerung hin zu einer echten Anreiz-Regelung. Besonderes Augenmerk der Arbeit liegt in einer durch das allgemeine Unbundling-Gebot bedingten rigorosen Trennung zwischen Markt- und Netzakteuren. Nach umfangreicher Analyse des hierbei entstehenden geschlossenen Regelkreises erfolgt die beispielhafte Anwendung der Regelungsarchitektur für den Aufbau eines neuartigen Echtzeit-Engpassmanagementsystems. Weitere praktische Vorteile des entwickelten Ansatzes im Vergleich zu bestehenden Konzepten werden anhand zweier Fallstudien deutlich. Die port-basierte Systemmodellierung, der Verzicht auf zentralisierte Regeleingriffe und nicht zuletzt die Möglichkeit zur automatischen, dezentralen Selbstregulation aller Preise über das Gesamtnetz hinweg stellen schließlich die problemlose Erweiterbarkeit um zusätzliche optionale Anreizkomponenten sicher.
A massive white dwarf member of the Coma Berenices Open Cluster
Creators: name: Dobbie, P. D.
name: Casewell, S. L.
name: Burleigh, M. R.
name: Boyce, D. D.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the identification, from a photometric, astrometric and spectroscopic study, of a massive white dwarf member of the nearby, approximately solar metalicity, Coma Berenices open star cluster (Melotte 111). We find the optical to near-IR energy distribution of WD1216+260 to be entirely consistent with that of an isolated DA and determine the effective temperature and surface gravity of this object to be $T_{\rm eff}$=$15739^{+197}_{-196}$K and log $g$=$8.46^{+0.03}_{-0.02}$. We set tight limits on the mass of a putative cool companion, M$\simgreat$0.036M$_{\odot}$ (spatially unresolved) and M$\simgreat$0.034M$_{\odot}$, (spatially resolved and a$\simless$2500AU). Based on the predictions of CO core, thick-H layer evolutionary models we determine the mass and cooling time of WD1216+260 to be M$_{\rm WD}$=$0.90 \pm0.04$M$_{\odot}$ and $τ$$_{\rm cool}$=$363^{+46}_{-41}$Myrs respectively. For an adopted cluster age of $τ$=500$\pm$100Myrs we infer the mass of its progenitor star to be M$_{\rm init}$=$4.77^{+5.37}_{-0.97}$M$_{\odot}$. We briefly discuss this result in the context of the form of the stellar initial mass-final mass relation.
description: accepted for publication in MNRAS
Density, speed of sound, refractive index and relative permittivity of methanol, propan-1-ol or pentan-1-ol + aniline liquid mixtures. Application of the Kirkwood-Fröhlich model
Creators: name: Hevia, Fernando
name: Alonso, Víctor
name: González, Juan Antonio
name: Sanz, Luis Felipe
name: de la Fuente, Isaías García
name: Cobos, José Carlos
Publisher: name: arXiv
Year: 2024
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Densities and speeds of sound at a temperature $T$ = 298.15 K, relative permittivities at 1 MHz and refractive indices at the sodium D-line at $T$ = (293.15 K to 303.15 K), all at a pressure p = 0.1 MPa, are reported for liquid mixtures methanol, propan-1-ol or pentan-1-ol + aniline. Excess molar volume ($V_{\text{m}}^{\text{E}}$), excess isentropic compressibility, excess speed of sound, excess refractive index, excess relative permittivity ($\varepsilon_{\text{r}}^{\text{E}}$) and its temperature derivative are calculated and fitted to Redlich-Kister polynomials. The agreement among the reported data and other literature sources is analysed by comparing $V_{\text{m}}^{\text{E}}$, $n_{\text{D}}^{\text{E}}$, $\varepsilon_{\text{r}}^{\text{E}}$ and the deviation of the speed of sound from mole-fraction linearity. The positive excess molar internal energies at constant volume ($U_{\text{m,}V}^{\text{E}}$) show the dominance of the breaking of interactions between like molecules in the energy balance on mixing, particularly the breaking of strong dipolar interactions between aniline molecules. This contribution is also dominant for the $\varepsilon_{\text{r}}^{\text{E}}$ values, as they are negative and decrease with the length of the alkan-1-ol chain. Calculations on the concentration-concentration structure factor are consistent with these statements, revealing homocoordination in the studied systems. The $V_{\text{m}}^{\text{E}}$ are negative, which together with the positive $U_{\text{m,}V}^{\text{E}}$ indicate the existence of important structural effects in the studied mixtures. The application of the Kirkwood-Fröhlich model shows that the average relative orientation of neighbouring dipoles is similar in the mixtures methanol + aniline or + pyridine, in spite of the different character of the predominant interactions in the latter mixture (heterocoordination).
title: Religious, secular, and spiritual diversity on campus: Book review of Goodman, Giess & Patel (2019) Educating about religious diversity and interfaith engagement
Creators: name: deJonge-Kannan, Karin
Publisher: name: Utah State University
Year: 2021

description: Book review of
Goodman, K.M., Giess, M.E., & Patel, E (2019). Educating about religious diversity and interfaith engagement: A handbook for student affairs. Stylus Publishing.
Bistable systems with stochastic noise: Virtues and limits of effective one-dimensional Langevin equations
Creators: name: Lucarini, V.
name: Faranda, D.
name: Willeit, M.
Publisher: name: Göttingen : Copernicus GmbH
Year: 2012
Subjects: subject: amplification
subject: complexity
subject: mathematical analysis
subject: numerical model
subject: observational method
subject: one-dimensional modeling
subject: overturn
subject: thermohaline circulation
subject: 530

description: The understanding of the statistical properties and of the dynamics of multistable systems is gaining more and more importance in a vast variety of scientific fields. This is especially relevant for the investigation of the tipping points of complex systems. Sometimes, in order to understand the time series of given observables exhibiting bimodal distributions, simple one-dimensional Langevin models are fitted to reproduce the observed statistical properties, and used to investing-ate the projected dynamics of the observable. This is of great relevance for studying potential catastrophic changes in the properties of the underlying system or resonant behaviours like those related to stochastic resonance-like mechanisms. In this paper, we propose a framework for encasing this kind of studies, using simple box models of the oceanic circulation and choosing as observable the strength of the thermohaline circulation. We study the statistical properties of the transitions between the two modes of operation of the thermohaline circulation under symmetric boundary forcings and test their agreement with simplified one-dimensional phenomenological theories. We extend our analysis to include stochastic resonance-like amplification processes. We conclude that fitted one-dimensional Langevin models, when closely scrutinised, may result to be more ad-hoc than they seem, lacking robustness and/or well-posedness. They should be treated with care, more as an empiric descriptive tool than as methodology with predictive power.
Geometric Representations of Random Hypergraphs
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: Computational topology
Copulas
Factor models
Graphical models
Random geometric graphs
Simplicial complex

description: © 2017 American Statistical Association. We introduce a novel parameterization of distributions on hypergraphs based on the geometry of points in Rd. The idea is to induce distributions on hypergraphs by placing priors on point configurations via spatial processes. This specification is then used to infer conditional independence models, or Markov structure, for multivariate distributions. This approach results in a broader class of conditional independence models beyond standard graphical models. Factorizations that cannot be retrieved via a graph are possible. Inference of nondecomposable graphical models is possible without requiring decomposability, or the need of Gaussian assumptions. This approach leads to new Metropolis-Hastings Markov chain Monte Carlo algorithms with both local and global moves in graph space, generally offers greater control on the distribution of graph features than currently possible, and naturally extends to hypergraphs. We provide a comparative performance evaluation against state-of-the-art approaches, and illustrate the utility of this approach on simulated and real data.
Unconditional stability for multistep imex schemes: Theory
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: linear multistep ImEx
unconditional stability
ImEx stability
high order time stepping

description: © 2017 Society for Industrial and Applied Mathematics. This paper presents a new class of high order linear ImEx (implicit-explicit) multistep schemes with large regions of unconditional stability. Unconditional stability is a desirable property of a time stepping scheme, as it allows the choice of time step solely based on accuracy considerations. Of particular interest are problems for which both the implicit and explicit parts of the ImEx splitting are stiff. Such splittings can arise, for example, in variable coefficient problems, or the incompressible Navier-Stokes equations. To characterize the new ImEx schemes, an unconditional stability region is introduced, which plays a role analogous to that of the stability region in conventional multistep methods. Moreover, computable quantities (such as a numerical range) are provided that guarantee an unconditionally stable scheme for a proposed ImEx matrix splitting. The new approach is illustrated with several examples. Coefficients of the new schemes up to fifth order are provided.
A Force-Free Magnetic Field Solution in Toroidal Coordinates
Creators: name: Marsh, Gerald E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: While there are no known analytic solutions for force-free fields in toroidal coordinates, with a reasonable boundary condition it is possible to find a solution for the surface field and, with a restriction on the form of the field, to the interior of the torus as well.
description: 19 pages; 7 Figures
Two-field model of gravitational-scalar instability and the formation of supermassive black holes in the early Universe
Creators: name: Ignat'ev, Yu. G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Based on the previously formulated mathematical model of a statistical system with scalar interaction of fermions and the theory of gravitational-scalar instability of a cosmological model based on a two-component statistical system of scalarly charged degenerate fermions, a numerical model of the cosmological evolution of gravitational-scalar perturbations in the presence of classical and phantom scalar fields is constructed and studied. The gravitational-scalar instability in the early stages of expansion in the model under study arises at sufficiently large scalar charges, and the instability develops near the unstable points of the vacuum doublet. Shortwave perturbations of the free phantom field turn out to be stable at stable singular points of the vacuum doublet. It is shown that for sufficiently large scalar charges, mass perturbations can grow to the values of masses Black Hole Seeds (BHS).
description: 14 pages, 16 figures, 12 references. arXiv admin note: substantial text overlap with arXiv:2207.05066
The poset perspective on alternating sign matrices
Creators: name: Striker, Jessica
Publisher: name: arXiv
Year: 2009
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 06A07, 05A05, 05E10

description: Alternating sign matrices (ASMs) are square matrices with entries 0, 1, or -1 whose rows and columns sum to 1 and whose nonzero entries alternate in sign. We put ASMs into a larger context by studying the order ideals of subposets of a certain poset, proving that they are in bijection with a variety of interesting combinatorial objects, including ASMs, totally symmetric self--complementary plane partitions (TSSCPPs), Catalan objects, tournaments, semistandard Young tableaux, and totally symmetric plane partitions. We use this perspective to prove an expansion of the tournament generating function as a sum over TSSCPPs which is analogous to a known formula involving ASMs.
description: 10 pages, to appear in DMTCS as part of the conference proceedings for FPSAC 2009
title: Taking into Account Interpersonal Aspects of Teacher Feedback: Principles of Responding to Student Writing (Republication)
Creators: name: Shvidko, Elena
Publisher: name: Utah State University
Year: 2021

description: Providing feedback on student work is a fundamental aspect of instruction and an important part of the learning process. A considerable amount of literature describes the pedagogical value of different types of feedback—explicit vs. implicit, comprehensive vs. selective, direct vs. indirect, and feedback on content vs. feedback on form—thus treating feedback primarily as an instructional/informational phenomenon. It must be remembered, however, that there is a real person behind each paper; therefore, interpersonal aspects of teacher feedback should not be disregarded. This article discusses five principles of responding to student writing that take into account this interpersonal nature of feedback: providing positive comments, avoiding appropriating student writing, responding as a reader, involving students in the revision process, and minimizing student frustration. The author suggests that these principles can help instructors deliver supporting and encouraging feedback that will be able to demonstrate their genuine interest in students’ ideas, acknowledge students’ efforts and writing progress, respect their voice and agency, and foster their growing motivation and self-confidence as writers.
This is a special republication of an article that originally appeared in the Fall 2020 issue. It is republished due to a versioning error in the earlier issue. The error has been corrected in the Fall 2020 issue as well.
Buddhist philosophy, nature and harmony: implications for product design
Creators: name: Vongphantuset, J
Publisher: name: University Of Tasmania
Year: 2023

description: This study examines the idea of Buddhist philosophy in its understanding of nature, both outside (surroundings) and inside (self), and seeks to find ways of assimilating these understandings in the design of utilitarian objects. These could then exist in harmony with nature in both physical and philosophical terms. As a designer who grew up in an Eastern culture, I am interested in Buddhist philosophy which teaches me to understand the nature of self, and of living in harmony with the surrounding nature. Also, the opportunity to live and to visit many places in Tasmania, has provided the luxury of experiencing different aspects of nature first hand. I have brought these two personal experiences together in the design of utilitarian interior objects. The objects and the exhibition are inspired by the Buddhist concepts of: Enlightenment, Samsara, Mind, Samadhi and Puccha - Vissajjana. The study is informed by the works of designers and sculptors such as: Shiro Kuramata, Masatoshi Sakaegi, Bruno Munari, Anthony Caro and Andy Goldsworthy whose works are inspired by nature and which have, also, intrinsic beauty through their simplicity. It also looks into Shaker Design, Thai Craft, and, briefly into Modern and Post Modern movements for possible connections or contradictions. I feel that as I practice designing these objects, I am in a way making a journey into myself and learning more about my own identity than I understood before. The outcome of this personal approach to design, informed and extended by my reading and experiment research activity, is a group of unique design works which embody an Eastern perspective towards natural harmony, synthesised with Western functional utility. I believe this makes an original and significant contribution to the field of design.
Einführung in das Forschungsinformationssystem VIVO : Hands-On-Lab auf dem 6. Deutschen Bibliothekartag
Creators: name: Barber, Martin
name: Hauschke, Christian
name: Walther, Tatiana
Publisher: name: Erlangen : VDB
Year: 2017
Subjects: subject: Forschungsinformationen
subject: Forschungsinformationssystem
subject: VIVO VIVO
subject: current research information system
subject: research information
subject: 620

description: VIVO, ein auf Linked-Data-Technologien basierendes Open-Source-Forschungsinformationssystem aus den USA, gewinnt zunehmend an Verbreitung in Europa. Um den Bekanntheitsgrad von VIVO im deutschsprachigen, bibliothekarischen Raum zu erhöhen, werden VIVO und die am Open Science Lab (OSL) der Technischen Informationsbibliothek (TIB) entwickelten Zusatzfeatures - wie zum Beispiel die Integration des Kerndatensatzes Forschung in VIVO - im Rahmen eines Hands-On-Labs dem Publikum vorgestellt. Unter Anleitung des OSL-Teams können die Teilnehmer der Session sich mit dem System praktisch auseinandersetzten sowie bestimmte Grundfunktionen und Features des Systems erproben. VIVO wird dazu im Vorfeld in einer Virtual Machine distribuiert und mit beispielhaften Stammdaten befüllt.