cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Voltage and current profiles and low-order approximation of frequency-dependent transmission line parameters
Creators: name: Marti, Luis
Publisher: name: University of British Columbia
Year: 2010

description: In this thesis project, two models related to the simulation of electromagnetic transients in power systems, have been developed. The first model has been designed to find voltages and currents at a number of intermediate, equally spaced points along the line ("profile"), from the solution at the end points (taking into account the frequency dependence of the line parameters). This "profile model" is derived from the cascade connection of n equivalent circuits, each one representing a segment of the line. The solution is carried out with an internal time step which is an exact submultiple of the travel time of the propagation mode in consideration. A series of tests shows that the results obtained with this model are more accurate than those obtained if the standard practice of segmenting the line is followed. With the aid of the profile routines, a movie which illustrates the propagation of transients along a line, has been produced as well. The second part of this thesis describes the development of a low-order approximation of the frequency-dependence of line parameters, from a reduced amount of information. Using the electrical parameters at power frequency and dc conductor resistances, the tower configuration of the line is reconstructed. This equivalent line configuration permits the evaluation of the line parameters over a wide frequency range. Rational functions are then used to approximate the frequency-dependence of these parameters over a limited frequency range with a reduced order model. Analytical tests and transient simulations, indicate that the model is reasonably accurate over the frequency range of interest in most practical applications. Both models have been incorporated into the UBC version of the Electromagnetic Transients Program (EMTP).
Fermi-point scenario for emergent gravity
Creators: name: Volovik, G. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Let us assume that gravity is an emergent low-energy phenomenon arising from a topologically stable defect in momentum space -- the Fermi point. What are the consequences? We discuss the natural values of fermion masses and cosmological constant; flatness of the Universe; bounds on Lorentz violation; etc.
description: 10 pages, 6 figures, draft for proceedings of conference "From Quantum to Emergent Gravity: Theory and Phenomenology", Trieste June 11-15 (2007), revised after referee report
Discriminator-Free Generative Adversarial Attack
Creators: name: Lu, Shaohao
name: Xian, Yuqiao
name: Yan, Ke
name: Hu, Yi
name: Sun, Xing
name: Guo, Xiaowei
name: Huang, Feiyue
name: Zheng, Wei-Shi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The Deep Neural Networks are vulnerable toadversarial exam-ples(Figure 1), making the DNNs-based systems collapsed byadding the inconspicuous perturbations to the images. Most of the existing works for adversarial attack are gradient-based and suf-fer from the latency efficiencies and the load on GPU memory. Thegenerative-based adversarial attacks can get rid of this limitation,and some relative works propose the approaches based on GAN.However, suffering from the difficulty of the convergence of train-ing a GAN, the adversarial examples have either bad attack abilityor bad visual quality. In this work, we find that the discriminatorcould be not necessary for generative-based adversarial attack, andpropose theSymmetric Saliency-based Auto-Encoder (SSAE)to generate the perturbations, which is composed of the saliencymap module and the angle-norm disentanglement of the featuresmodule. The advantage of our proposed method lies in that it is notdepending on discriminator, and uses the generative saliency map to pay more attention to label-relevant regions. The extensive exper-iments among the various tasks, datasets, and models demonstratethat the adversarial examples generated by SSAE not only make thewidely-used models collapse, but also achieves good visual quality.The code is available at https://github.com/BravoLu/SSAE.
description: 9 pages, 6 figures, 4 tables
Edukacja outdoor w praktykach studenckich a rzeczywistość
Creators: name: Roszak, Bożena
Publisher: name: Instytut Pedagogiki Uniwersytetu Wrocławskiego
Year: 2018

description: W niniejszym opracowaniu podjęta zostanie próba spojrzenia na praktyki studenckie z perspektywy edukacji outdoor i wskazania korzyści, jakie niesie ona ze sobą w procesie wychowania i nauczania. Analizie poddane zostaną również strefy modelu Komfort – Napięcie – Panika, sprzyjające nabywaniu miękkich kompetencji podczas aktywności w terenie. Aktywne zajęcia w terenie wymagają od nauczycieli stosowania kompetencji, które w formalnej edukacji szkolnej nie są ujawniane, zasadne jest więc również analizowanie pożądanych kompetencji nauczyciela oferującego aktywne zajęcia outdoor.
Dipsticking the Study of Indigenous African Music from the John Blacking Era into the 21st Century
Creators: name: MG, Mapaya
Publisher: name: Zenodo
Year: 2018
Subjects: subject: African musicology
subject: Ethnomusicology
subject: Cultural studies
subject: Anthropology
subject: FOS: Sociology
subject: African studies

description: Indigenous African music, like all music, is as old as humanity (Adum, Ekwugha & Ojiakor, 2015; Friedmann, 2011). European explorers and missionaries encountered it before its study took root. It was only in 1947 in South Africa, with the formation of the African Music Society, followed almost a decade later in 1955 by the formation of the Society for Ethnomusicology in the United States, that scholarly attention to African music gained traction (Agawu, 1992). Before these developments, the music was merely documented, if studied at all, primarily for purely musicological reasons. Its study, in the main, served as a way in which insight into the culture and/or religiosity of Africa was to be (mis)construed. While celebrating the contribution of John Blacking in the establishment of African musicology, it would be disingenuous to overlook some of the missteps, misrepresentations and neglect of the local abstractions in the enterprise of musicology. Highlighting these should not be seen negatively, but as an effort to correct the history.
Invisible Z decay width bounds on active-sterile neutrino mixing in the (3+1) and (3+2) models
Creators: name: Pires, C. A. de S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work we consider the standard model extended with singlet sterile neutrinos with mass in the eV range and mixed with the active neutrinos. The active-sterile neutrino mixing renders new contributions to the invisible Z decay width which, in the case of light sterile neutrinos, depends on the active-sterile mixing matrix elements only. We then use the current experimental value of the invisible Z decay width to obtain bounds on these mixing matrix elements for both (3+1) and (3+2) models.
description: 10 pages, 5 figures
Multi-messenger Time-domain Signatures Of Supermassive Black Hole Binaries
Creators: name: Charisi, Maria
name: Taylor, Stephen R.
name: Runnoe, Jessie
name: Bogdanovic, Tamara
name: Trump, Jonathan R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Supermassive black hole binaries (SMBHBs) are a natural outcome of galaxy mergers and should form frequently in galactic nuclei. Sub-parsec binaries can be identified from their bright electromagnetic emission, e.g., Active Galactic Nuclei (AGN) with Doppler shifted broad emission lines or AGN with periodic variability, as well as from the emission of strong gravitational radiation. The most massive binaries (with total mass >10^8 M_sol) emit in the nanohertz band and are targeted by Pulsar Timing Arrays (PTAs). Here we examine the synergy between electromagnetic and gravitational wave signatures of SMBHBs. We connect both signals to the orbital dynamics of the binary and examine the common link between them, laying the foundation for joint multi-messenger observations. We find that periodic variability arising from relativistic Doppler boost is the most promising electromagnetic signature to connect with GWs. We delineate the parameter space (binary total mass/chirp mass versus binary period/GW frequency) for which joint observations are feasible. Currently multi-messenger detections are possible only for the most massive and nearby galaxies, limited by the sensitivity of PTAs. However, we demonstrate that as PTAs collect more data in the upcoming years, the overlapping parameter space is expected to expand significantly.
description: submitted to MNRAS
Reexamining Black-Body Shifts for Hydrogenlike Ions
Creators: name: Jentschura, U. D.
name: Haas, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We investigate black-body induced energy shifts for low-lying levels of atomic systems, with a special emphasis on transitions used in current and planned high-precision experiments on atomic hydrogen and ionized helium. Fine-structure and Lamb-shift induced black-body shifts are found to increase with the square of the nuclear charge number, whereas black-body shifts due to virtual transitions decrease with increasing nuclear charge as the fourth power of the nuclear charge. We also investigate the decay width acquired by the ground state of atomic hydrogen, due to interaction with black-body photons. The corresponding width is due to an instability against excitation to higher excited atomic levels, and due to black-body induced ionization. These effects limit the lifetime of even the most fundamental, a priori absolutely stable, "asymptotic" state of atomic theory, namely the ground state of atomic hydrogen.
description: 11 pages; LaTeX
ENHANCING SELF-CARE OF NURSES: A HEALTHY NURSE HEALTHY NATION™ PROJECT
Creators: name: Akubuilo, Frances
Publisher: name: Zenodo
Year: 2020

description: The purpose of this Doctor of Nursing Practice (DNP) project is to enhance selfcare (which has been operationalized as physical activity) among Healthy Nurse Health Nation (HNHN™) participants. Specific aims are to describe nursing factors associated with light to moderate physical activity, vigorous physical activity, and muscle strengthening exercises. A secondary aim is to develop online educational materials and activities to encourage physical activity for use by the HNHN™ Initiative. Nurses are the largest workforce in healthcare and are trained to care for a variety of patient types; however, that training may not include self-care principles. Both extrinsic factors (such as lack of support from institutions) as well as intrinsic factors (such as personal beliefs and personal attributes) may influence self-care behaviors of nurses. The literature suggests that a lack of self-care behaviors can lead to negative outcomes such as moral distress, burnout, job dissatisfaction, anger, stress, and depression. Tenets of Social Cognitive Theory guided the development and implementation of this DNP project. Secondary data from a large online survey employed by HNHN™ (N=15,492 nurses) were analyzed with appropriate descriptive (e.g., numbers and percentages) and inferential statistics (e.g., correlations, p-values) to identify facilitators and barriers to physical activity in nurses. A gap analysis was completed in order to iv identify necessary educational materials and activities to contribute to the HNHN™ initiative. Nurses within the 41-50 age group as well as nurses who identified as Black/African American were least likely to engage in physical activity. Poor physical/mental health and pain were shown to be the strongest barriers to physical activity (r= -.143, r= -.117, p<0.001 respectively), while receiving emotional support and wellness training were shown to be the strongest facilitators (r=.134, r=.097, p<0.001 respectively). The development of online self-care videos and a physical activity social media challenge are planned. The number of hits on the self-care video and physical activity challenge will provide evidence of the efficacy of the project interventions. Nurse self-care is a topic of increasing interest among healthcare professionals. To improve self-care behaviors, research recommends assessing healthcare workers’ selfefficacy in addition to providing continuous individualized educational and motivational training programs. When looking at self-care domains such as physical activity, nurses were found to be unhealthier than the average American. Contributing to the HNHN™ initiative by assessing needs, relaying vital information, and creating periodic challenges can aid in engaging a diverse population of nurses while providing motivation to initiate and sustain health-promoting behaviors.
Separating algebras and finite reflection groups
Creators: name: Dufresne, Emilie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 13A50

description: A separating algebra is, roughly speaking, a subalgebra of the ring of invariants whose elements distinguish between any two orbits that can be distinguished using invariants. In this paper, we introduce a geometric notion of separating algebra. This allows us to prove that only groups generated by reflections may have polynomial separating algebras, and only groups generated by bireflections may have complete intersection separating algebras.
description: 12 pages, corrected yet another typo
Light-induced disassembly of dusty bodies in inner protoplanetary discs: implications for the formation of planets
Creators: name: Wurm, Gerhard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Laboratory experiments show that a solid-state greenhouse effect in combination with thermophoresis can efficiently erode a dust bed in a low-pressure gaseous environment. The surface of an illuminated, light absorbing dusty body is cooler than the dust below the surface (solidstate greenhouse effect). This temperature gradient leads to a directed momentum transfer between gas and dust particles and the dust particles are subject to a force towards the surface(thermophoresis). If the thermophoretic force is stronger than gravity and cohesion, dust particles are ejected. Applied to protoplanetary discs, dusty bodies smaller than several kilometres in size which are closer to a star than about 0.4 au are subject to a rapid and complete disassembly to submillimetre size dust aggregates by this process. While an inward-drifting dusty body is destroyed, the generated dust is not lost for the disc by sublimation or subsequent accretion on to the star but can be reprocessed by photophoresis or radiation pressure. Planetesimals cannot originate through aggregation of dust inside the erosion zone. If objects larger than several kilometres already exist, they prevail and further grow by collecting dust from disassembled smaller bodies. The pile-up of solids in a confined inner region of the disc, in general, boosts the formation of planets. Erosion is possible in even strongly gas-depleted inner regions as observed for TW Hya. Reprocessing of dust through light-induced erosion offers one possible explanation for growth of large cores of gas-poor giant planets in a gas-starved region as recently found around HD 149026b.
Quantum information technology with Sagnac interferometer: Interaction-free measurement, quantum key distribution and quantum secret sharing
Creators: name: de Brito, Wellington Alves
name: Ramos, Rubens Viana
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The interferometry of single-photon pulses has been used to implement quantum technology systems, like quantum key distribution, interaction-free measurement and some other quantum communication protocols. In most of these implementations, Mach-Zehnder, Michelson and Fabry-Perot interferometers are the most used. In this work we present optical setups for interaction-free measurement, quantum key distribution and quantum secret sharing using the Sagnac interferometer. The proposed setups are described as well the quantum protocols using them are explained.
description: 15 pages and 9 figures
CrossAug: A Contrastive Data Augmentation Method for Debiasing Fact Verification Models
Creators: name: Lee, Minwoo
name: Won, Seungpil
name: Kim, Juae
name: Lee, Hwanhee
name: Park, Cheoneum
name: Jung, Kyomin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Fact verification datasets are typically constructed using crowdsourcing techniques due to the lack of text sources with veracity labels. However, the crowdsourcing process often produces undesired biases in data that cause models to learn spurious patterns. In this paper, we propose CrossAug, a contrastive data augmentation method for debiasing fact verification models. Specifically, we employ a two-stage augmentation pipeline to generate new claims and evidences from existing samples. The generated samples are then paired cross-wise with the original pair, forming contrastive samples that facilitate the model to rely less on spurious patterns and learn more robust representations. Experimental results show that our method outperforms the previous state-of-the-art debiasing technique by 3.6% on the debiased extension of the FEVER dataset, with a total performance boost of 10.13% from the baseline. Furthermore, we evaluate our approach in data-scarce settings, where models can be more susceptible to biases due to the lack of training data. Experimental results demonstrate that our approach is also effective at debiasing in these low-resource conditions, exceeding the baseline performance on the Symmetric dataset with just 1% of the original data.
description: 5 pages, accepted as a short paper at CIKM 2021
title: International players fiddle while Syria burns
Creators: name: Murphy, Ray
Publisher: name: The Irish Times
Year: 2013
Subjects: subject: Syria
subject: United Nations
subject: Protection of civilians

description: The UN Human Rights office estimated that more than 60,000 people have died in Syria's bloody civil war, surpassing the Syrian opposition's estimates by one-third. UN High Commissioner for Human Rights Navi Pillay faulted the entire international community, including the UN, for having 'fiddled around the edges while Syria burns.' As the violence threatens to engulf the region, the question remains what can be done to halt the slaughter of innocent civilians.
Algebraic structures on parallel M2-branes
Creators: name: Gustavsson, Andreas
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the course of closing supersymmetry on parallel M2 branes up to a gauge transformation, following the suggestion in hep-th/0611108 of incorporating a gauge field which only has topological degrees of freedom, we are led to assume a certain algebraic structure for the low energy theory supposedly living on parallel M2 branes.
description: 13 pages; v4: complete on-shell closure of supersymmetry, abstract changed, v5: gauge transformations are carefully defined
DEVELOPMENT OF A DASHBOARD FOR NURSING-SENSITIVE INDICATORS
Creators: name: Bashiri, Mojgan
Publisher: name: Zenodo
Year: 2020

description: In an era where healthcare organizations are increasingly scrutinized by external oversight agencies, individualized and cost-effective quality care must be provided to meet community demand. Accordingly, measuring clinical quality and evaluating healthcare throughputs has become increasingly important. Nurses play a key role in the delivery of patient care, and evaluation of the quality of care provided by nurses has been enhanced through the development and utilization of nursing-sensitive indicators (NSIs). NSIs are structured to identify key patient care delivery issues that are particularly influenced by nurses. They are used by nurse executives and others to quantify, monitor, and report the quality of nursing care in three domains of structure, process, and patient outcomes. NSIs have been shown to be effective outcome measures for assessing the quality of nursing care and identifying care deficiencies for performance improvement. Inconsistency in their reporting at hospitals within the Los Angeles County Department of Health Services (LACDHS) was identified as problematic as it prevented system-wide assessment of quality and the opportunity for facilities to share best practices. This quality improvement project was designed to standardize the reporting and use of NSI data throughout the LACDHS system. It involved the development of a dashboard to enable tracking of performance at all system hospitals. It was posited that having a system-wide dashboard would allow intra-facility comparisons and promote system-wide care improvements. iv The project involved an evidence-based practice quality improvement design to develop a system-based NSI Dashboard that provides a visual portrayal of NSI performance at each County hospital facility and the ability to benchmark facility and County performance with other facilities nationwide. The evaluation demonstrated general satisfaction with the design of the NSI Dashboard, its ease of use, and readability of data. Participants noted it provided opportunities to observe individual facility and system-wide performance, benchmark against other hospitals within the system and collectively implement strategies for improvement. Because the NSI dashboard enables LACDHS to benchmark performance of its facilities and identify care delivery trends, this tool will be used to assist in designing improvement strategies to resolve care deficiencies. This project also resulted in improved data collection efforts, standardization of data collection and greater consistency in data definitions.
Federated Learning in ASR: Not as Easy as You Think
Creators: name: Yu, Wentao
name: Freiwald, Jan
name: Tewes, Sören
name: Huennemeyer, Fabien
name: Kolossa, Dorothea
Publisher: name: arXiv
Year: 2021
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: With the growing availability of smart devices and cloud services, personal speech assistance systems are increasingly used on a daily basis. Most devices redirect the voice recordings to a central server, which uses them for upgrading the recognizer model. This leads to major privacy concerns, since private data could be misused by the server or third parties. Federated learning is a decentralized optimization strategy that has been proposed to address such concerns. Utilizing this approach, private data is used for on-device training. Afterwards, updated model parameters are sent to the server to improve the global model, which is redistributed to the clients. In this work, we implement federated learning for speech recognition in a hybrid and an end-to-end model. We discuss the outcomes of these systems, which both show great similarities and only small improvements, pointing to a need for a deeper understanding of federated learning for speech recognition.
Extreme multiplex spectroscopy at wide-field 4-m telescopes
Creators: name: Content, Robert
name: Shanks, Tom
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe the design and science case for a spectrograph for the prime focus of classical 4-m wide-field telescopes that can deliver at least 4000 MOS slits over a 1 degree field. This extreme multiplex capability means that 25000 galaxy redshifts can be measured in a single night, opening up the possibilities for large galaxy redshift surveys out to z~0.7 and beyond for the purpose of measuring the Baryon Acoustic Oscillation (BAO) scale and for many other science goals. The design features four cloned spectrographs and exploits the exclusive possibility of tiling the focal plane of wide-field 4-m telescopes with CCDs for multi-object spectroscopic purposes. In ~200 night projects, such spectrographs have the potential to make galaxy redshift surveys of ~6 million galaxies over a wide redshift range and thus may provide a low-cost alternative to other survey routes such as WFMOS and SKA. Two of these extreme multiplex spectrographs are currently being designed for the AAT (NG1dF) and Calar Alto (XMS) 4-m class telescopes. NG2dF, a larger version for the AAT 2 degree field, would have 12 clones and at least 12000 slits. The clones use a transparent design including a grism in which all optics are smaller than the clone square subfield so that the clones can be tightly packed with little gaps between the contiguous fields. Only low cost glasses are used; the variations in chromatic aberrations between bands are compensated by changing one or two of the lenses adjacent to the grism. The total weight and length is smaller with a few clones than a unique spectrograph which makes it feasible to place the spectrograph at the prime focus.
description: 8 pages, 4 figures, to appear in proceedings of Astronomical Telescopes and Instrumentation, SPIE conference, Marseille, 23-28 June, 2008
COVID-19 Multidimensional Kaggle Literature Organization
Creators: name: Eren, Maksim E.
name: Solovyev, Nick
name: Hamer, Chris
name: McDonald, Renee
name: Alexandrov, Boian S.
name: Nicholas, Charles
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: The unprecedented outbreak of Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2), or COVID-19, continues to be a significant worldwide problem. As a result, a surge of new COVID-19 related research has followed suit. The growing number of publications requires document organization methods to identify relevant information. In this paper, we expand upon our previous work with clustering the CORD-19 dataset by applying multi-dimensional analysis methods. Tensor factorization is a powerful unsupervised learning method capable of discovering hidden patterns in a document corpus. We show that a higher-order representation of the corpus allows for the simultaneous grouping of similar articles, relevant journals, authors with similar research interests, and topic keywords. These groupings are identified within and among the latent components extracted via tensor decomposition. We further demonstrate the application of this method with a publicly available interactive visualization of the dataset.
description: Maksim E. Eren, Nick Solovyev, Chris Hamer, Renee McDonald, Boian S.Alexandrov, and Charles Nicholas. 2021. COVID-19 Multidimensional Kaggle Literature Organization. In ACM Symposium on Document Engineering 2021
Iron-60 evidence for early injection and efficient mixing of stellar debris in the protosolar nebula
Creators: name: Dauphas, N.
name: Cook, D. L.
name: Sacarabany, A.
name: Frohlich, C.
name: Davis, A. M.
name: Wadhwa, M.
name: Pourmand, A.
name: Rauscher, T.
name: Gallino, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Among extinct radioactivities present in meteorites, 60Fe (t1/2 = 1.49 Myr) plays a key role as a high-resolution chronometer, a heat source in planetesimals, and a fingerprint of the astrophysical setting of solar system formation. A critical issue with 60Fe is that it could have been heterogeneously distributed in the protoplanetary disk, calling into question the efficiency of mixing in the solar nebula or the timing of 60Fe injection relative to planetesimal formation. If this were the case, one would expect meteorites that did not incorporate 60Fe (either because of late injection or incomplete mixing) to show 60Ni deficits (from lack of 60Fe decay) and collateral effects on other neutron-rich isotopes of Fe and Ni (coproduced with 60Fe in core-collapse supernovae and AGB-stars). Here, we show that measured iron meteorites and chondrites have Fe and Ni isotopic compositions identical to Earth. This demonstrates that 60Fe must have been injected into the protosolar nebula and mixed to less than 10 % heterogeneity before formation of planetary bodies.
description: 15 pages, 5 figures, ApJ in press
CNG-Theory Particle Resonance Catalogue
Creators: name: Price, Robert Anthony
Publisher: name: Zenodo
Year: 2025

description: Chronogenesis Theory: Particle Resonance Catalogue

 

This catalogue lists all known Standard Model particles and matches each to a predicted mass using the Chronogenesis Theory. The theory calculates particle masses from resonance layers in the curved time field Θ, with no free parameters. This document shows how the electron, quarks, neutrinos, Higgs, and other particles emerge naturally from the theory’s curvature spectrum. Each match includes the mode number, predicted mass, and comparison to experimental values. This file provides direct evidence that Chronogenesis can accurately predict the mass of every fundamental particle.
High energy radiation from Centaurus A
Creators: name: Kachelriess, M.
name: Ostapchenko, S.
name: Tomas, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We calculate for the nearest active galactic nucleus (AGN), Centaurus A, the flux of high energy cosmic rays and of accompanying secondary photons and neutrinos expected from hadronic interactions in the source. We use as two basic models for the generation of ultrahigh energy cosmic rays (UHECR) shock acceleration in the radio jet and acceleration in the regular electromagnetic field close to the core of the AGN. While scattering on photons dominates in scenarios with acceleration close to the core, scattering on gas becomes more important if acceleration takes place along the jet. Normalizing the UHECR flux from Centaurus A to the observations of the Auger experiment, the neutrino flux may be marginally observable in a 1 km$^3$ neutrino telescope, if a steep UHECR flux $\d N/\d E\propto E^{-α}$ with $α=2.7$ extends down to $10^{17}$ eV. The associated photon flux is close to or exceeds the observational data of atmospheric Cherenkov and $γ$-ray telescopes for $α\gsim 2$. In particular, we find that already present data favour either a softer UHECR injection spectrum than $α=2.7$ for Centaurus A or a lower UHECR flux than expected from the normalization to the Auger observations.
description: 12 pages, 6 figures; v2: revised version to appear in a special issue of New Journal for Physics
Thermodynamic Bethe Ansatz past turning points: the (elliptic) sinh-Gordon model
Creators: name: Córdova, Lucía
name: Negro, Stefano
name: Massolo, Fidel I. Schaposnik
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We analyze the Thermodynamic Bethe Ansatz (TBA) for various integrable S-matrices in the context of generalized $T\bar T$ deformations. We focus on the sinh-Gordon model and its elliptic deformation in both its fermionic and bosonic realizations. We confirm that the determining factor for a turning point in the TBA, interpreted as a finite Hagedorn temperature, is the difference between the number of bound states and resonances in the theory. Implementing the numerical pseudo-arclength continuation method, we are able to follow the solutions to the TBA equations past the turning point all the way to the ultraviolet regime. We find that for any number $k$ of resonances the pair of complex conjugate solutions below the turning point is such that the effective central charge is minimized. As $k\to\infty$ the UV effective central charge goes to zero as in the elliptic sinh-Gordon model. Finally we uncover a new family of UV complete integrable theories defined by the bosonic counterparts of the S-matrices describing the $Φ_{1,3}$ integrable deformation of non-unitary minimal models $\mathcal M_{2,2n+3}$.
description: 37 pages, 11 figures
Effect of heteroepitaxial growth on LT-GaAs: ultrafast optical properties
Creators: name: Afalla, Jessica
name: Prieto, Elizabeth Ann
name: Husay, Horace Andrew
name: Gonzales, Karl Cedric
name: Catindig, Gerald
name: Abulikemu, Aizitiaili
name: Somintac, Armando
name: Salvador, Arnel
name: Estacio, Elmer
name: Tani, Masahiko
name: Hase, Muneaki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Epitaxial low temperature grown GaAs (LT-GaAs) on silicon (LT-GaAs/Si) has the potential for terahertz (THz) photoconductive antenna applications. However, crystalline, optical and electrical properties of heteroepitaxial grown LT-GaAs/Si can be very different from those grown on semi-insulating GaAs substrates (reference). In this study, we investigate optical properties of an epitaxial grown LT-GaAs/Si sample, compared to a reference grown under the same substrate temperature, and with the same layer thickness. Anti-phase domains and some crystal misorientation are present in the LT-GaAs/Si. From coherent phonon spectroscopy, the intrinsic carrier densities are estimated to be ~$10^{15}$ cm$^{-3}$ for either sample. Strong plasmon damping is also observed. Carrier dynamics, measured by time-resolved THz spectroscopy at high excitation fluence, reveals markedly different responses between samples. Below saturation, both samples exhibit the desired fast response. Under optical fluences $\geq$ 54 $μ$ J/cm$^2$, the reference LT-GaAs layer shows saturation of electron trapping states leading to non-exponential behavior, but the LT-GaAs/Si maintains a double exponential decay. The difference is attributed to the formation of As-As and Ga-Ga bonds during the heteroepitaxial growth of LT-GaAs/Si, effectively leading to a much lower density of As-related electron traps.
description: 8 pages, supplementary info separate
Radial Velocities of Six OB Stars
Creators: name: Boyajian, T. S.
name: Gies, D. R.
name: Baines, E. K.
name: Barai, P.
name: Grundstrom, E. D.
name: McSwain, M. V.
name: Parks, J. R.
name: Riddle, R. L.
name: Ryle, W. T.
name: Wingert, D. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new results from a radial velocity study of six bright OB stars with little or no prior measurements. One of these, HD 45314, may be a long-period binary, but the velocity variations of this Be star may be related to changes in its circumstellar disk. Significant velocity variations were also found for HD 60848 (possibly related to nonradial pulsations) and HD 61827 (related to wind variations). The other three targets, HD 46150, HD 54879, and HD 206183, are constant velocity objects, but we note that HD 54879 has H$α$ emission that may originate from a binary companion. We illustrate the average red spectrum of each target.
description: Accepted for publication in PASP July 2007 issue
Multi-mode stabilization of torsional oscillations in single and multi-machine systems using excitation control
Creators: name: Yan, Andrew
Publisher: name: University of British Columbia
Year: 2010

description: Subsynchronous Resonance (SSR) phenomena in a thermal-electric power system with series-capacitor-compensated transmission lines may cause damaging torsional oscillations in the shaft of the turbine-generator. This thesis deals with a wide-range multi-mode stabilization of single-machine and multi-machine SSR systems using output feedback excitation control. Chapter 1 summarizes the SSR countermeasures to date. Chapter 2 presents a unified electro-mechanical model for SSR studies, illustrates the torsional interaction between the electrical and mechanical systems, and demonstrates that multi-mass representation of the turbine-generator must be used for SSR studies. For the control design, a reduced order model is desirable. For the model reduction, modal analysis is applied to identify the excitable torsional modes, and a mass-spring equivalencing technique to retain only the unstable modes is developed in Chapter 3. Using the reduced order one: machine models, linear optimal excitation controls are designed in Chapter 4. The controls are further simplified by examining the eigenvalue sensitivity, and the results are tested on the linear and nonlinear full models. In Chapter 5, the stabilization technique is further extended and applied to a two-machine system and a three-4nachine system. The stabilizers still can be designed one machine at a time using a one-machine equivalent for each machine by retaining only the path with the strongest interacting current and the critical electrical resonance frequency as seen by the machine. To coordinate all controllers for the entire system, an iterative process is developed. The controllers thus designed are tested on linear and nonlinear full models. From both eigenvalue analysis and nonlinear dynamic performance tests of the one-machine, two-machine, and three-machine systems, a conclusion is drawn in Chapter 6 that the excitation controls thus designed by the methods developed in this thesis can effectively stabilize single-machine and multi-machine SSR, systems over a wide range of capacitor compensation.
Collisional energy transfer in two-component plasmas
Creators: name: Vranjes, J.
name: Kono, M.
name: Poedts, S.
name: Tanaka, M. Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The friction in plasmas consisting of two species with different temperatures is discussed together with the consequent energy transfer. It is shown that the friction between the two species has no effect on the ion acoustic mode in a quasi-neutral plasma. Using the Poisson equation instead of the quasi-neutrality reveals the possibility for an instability driven by the collisional energy transfer. However, the different starting temperatures of the two species imply an evolving equilibrium. It is shown that the relaxation time of the equilibrium electron-ion plasma is, in fact, always shorter than the growth rate time, and the instability can thus never effectively take place. The results obtained here should contribute to the definite clarification of some contradictory results obtained in the past.
Investigating variations in the dust emissivity index in the Andromeda galaxy
Creators: name: Athikkat-Eknath, G.
name: Eales, S. A.
name: Smith, M. W. L.
name: Schruba, A.
name: Marsh, K. A.
name: Whitworth, A. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Over the past decade, studies of dust in the Andromeda galaxy (M31) have shown radial variations in the dust emissivity index ($β$). Understanding the astrophysical reasons behind these radial variations may give clues about the chemical composition of dust grains, their physical structure, and the evolution of dust. We use $^{12}$CO(J=1-0) observations taken by the Combined Array for Research in Millimeter Astronomy (CARMA) and dust maps derived from \textit{Herschel} images, both with an angular resolution of 8" and spatial resolution of 30 pc, to study variations in $β$ across an area of $\approx$ 18.6 kpc$^2$ in M31. We extract sources, which we identify as molecular clouds, by applying the astrodendro algorithm to the $^{12}$CO and dust maps, which as a byproduct allows us to compare continuum emission from dust and CO emission as alternative ways of finding molecular clouds. We then use these catalogues to investigate whether there is evidence that $β$ is different inside and outside molecular clouds. Our results confirm the radial variations of $β$ seen in previous studies. However, we find little difference between the average $β$ inside molecular clouds compared to outside molecular clouds, in disagreement with models which predict an increase of $β$ in dense environments. Finally, we find some clouds traced by dust with very little CO which may be either clouds dominated by atomic gas or clouds of molecular gas that contain little CO.
description: 14 pages, 11 figures, accepted for publication in MNRAS
Imprints of recoiling massive black-holes on the hot gas of early type galaxies
Creators: name: Devecchi, B.
name: Rasia, E.
name: Dotti, M.
name: Volonteri, M.
name: Colpi, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Anisotropic gravitational radiation from a coalescing black hole binary is known to impart recoil velocities of up to ~1000 km/s to the remnant black hole. In this context, we study the motion of a recoiling black hole inside a galaxy modelled as an Hernquist sphere, and the signature that the hole imprints on the hot gas, using N-body/SPH simulations. Ejection of the black hole results in a sudden expansion of the gas ending with the formation of a gaseous core, similarly to what is seen for the stars. A cometary tail of particles bound to the black hole is initially released along its trail. As the black hole moves on a return orbit, a nearly spherical swarm of hot gaseous particles forms at every apocentre: this feature can live up to ~ 100 Myr. If the recoil velocity exceeds the sound speed initially, the black hole shocks the gas in the form of a Mach cone in density near each super-sonic pericentric passage. We find that the X-ray fingerprint of a recoiling black hole can be detected in Chandra X-ray maps out to a distance of Virgo. For exceptionally massive black holes the Mach cone and the wakes could be observed out to a few hundred of Mpc. Detection of the Mach cone is found to become of twofold importance: i) as a probe of high-velocity recoils and ii) as an assessment of the scatter of the mass-sigma relation at large black hole masses.
description: 9 pages, 8 figures, new simulations added, accepted for publication in MNRAS
Resolved Conifolds in Supergravity Solutions
Creators: name: Ghezelbash, A. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct generalized 11D supergravity solutions of fully localized intersecting D2/D4 brane systems. These solutions are obtained by embedding six-dimensional resolved Eguchi-Hanson conifolds lifted to M-theory. We reduce these solutions to ten dimensions, obtaining new D-brane systems in type IIA supergravity. We discuss the limits in which the dynamics of the D2 brane decouples from the bulk for these solutions.
description: 9 pages, 2 figures, minor changes, references added, version to appear in Phys. Rev. D
CBM First-level Event Selector Data Management  Developments
Creators: name: De Cuveland, J.
name: Hutter, D.
name: Lindenstruth, V.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2014
Subjects: Physics

description: GSI Scientific Report 2013 - GSI Report 2014-1
Driving Weiss oscillations to Zero Resistance States by Microwave Radiation
Creators: name: Inarrea, Jesus
name: Platero, Gloria
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this work we present a theoretical model to study the effect of microwave radiation on Weiss oscillations. In our proposal Weiss oscillations, produced by an spatial periodic potential, are modulated by microwave radiation due to an interference effect between both, space and time-dependent, potentials. The final magnetoresistance depends mainly on the spatial period of the spatial potential and the frequency of radiation. Depending on the values of these parameters, we predict that Weiss oscillations can reach zero resistance states. On the other hand, these dissipationless transport states, created just by radiation, can be destroyed by the additional presence of a periodic space-dependent potential. Then by tuning the spatial period or the radiation frequency, the magnetoresistance can be strongly modified.
description: 4 pages and 5 figures
Instability in cosmological topologically massive gravity at the chiral point
Creators: name: Grumiller, Daniel
name: Johansson, Niklas
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L_0 and \bar{L}_0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than the ones by Brown and Henneaux, its fall-off behavior is compatible with spacetime being asymptotically AdS_3. We employ holographic renormalization to show that the variational principle is well-defined. The corresponding Brown-York stress tensor is finite, traceless and conserved. Finally we address possibilities to eliminate the instability and prospects for chiral gravity.
description: 19 pages. v3: corrected sign mistake in (4.1) and related equations, v4: corrected e-print number in Ref. [53]