cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reconfigurable Intelligent Surface Optimization for Uplink Sparse Code Multiple Access
Creators: name: Al-Nahhal, Ibrahim
name: Dobre, Octavia A.
name: Basar, Ertugrul
name: Ngatched, Telex M. N.
name: Ikki, Salama
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The reconfigurable intelligent surface (RIS)-assisted sparse code multiple access (RIS-SCMA) is an attractive scheme for future wireless networks. In this letter, for the first time, the RIS phase shifts of the uplink RIS-SCMA system are optimized based on the alternate optimization (AO) technique to improve the received signal-to-noise ratio (SNR) for a discrete set of RIS phase shifts. The system model of the uplink RIS-SCMA is formulated to utilize the AO algorithm. For further reduction in the computational complexity, a low-complexity AO (LC-AO) algorithm is proposed. The complexity analysis of the two proposed algorithms is performed. Monte Carlo simulations and complexity analysis show that the proposed algorithms significantly improve the received SNR compared to the non-optimized RIS-SCMA scenario. The LC-AO provides the same received SNR as the AO algorithm, with a significant reduction in complexity. Moreover, the deployment of RISs for the uplink RIS-SCMA is investigated.
description: 6 pages, 5 figures, published in IEEE Communications Letters
Image preprocessing and modified adaptive thresholding for improving OCR
Creators: name: Kshetry, Rohan Lal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: I.4.6; I.4.3

description: In this paper I have proposed a method to find the major pixel intensity inside the text and thresholding an image accordingly to make it easier to be used for optical character recognition (OCR) models. In our method, instead of editing whole image, I are removing all other features except the text boundaries and the color filling them. In this approach, the grayscale intensity of the letters from the input image are used as one of thresholding parameters. The performance of the developed model is finally validated with input images, with and without image processing followed by OCR by PyTesseract. Based on the results obtained, it can be observed that this algorithm can be efficiently applied in the field of image processing for OCR.
description: 5 pages, 7 figues
Casimir-Polder interaction between an atom and a small magnetodielectric sphere
Creators: name: Sambale, Agnes
name: Buhmann, Stefan Yoshi
name: Scheel, Stefan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: On the basis of macroscopic quantum electrodynamics and point-scattering techniques, we derive a closed expression for the Casimir-Polder force between a ground-state atom and a small magnetodielectric sphere in an arbitrary environment. In order to allow for the presence of both bodies and media, local-field corrections are taken into account. Our results are compared with the known van der Waals force between two ground-state atoms. To continuously interpolate between the two extreme cases of a single atom and a macroscopic sphere, we also derive the force between an atom and a sphere of variable radius that is embedded in an Onsager local-field cavity. Numerical examples illustrate the theory.
description: 9 pages, 4 figures, minor additions
E3DMT version 1 manual
Creators: name: Cowan, Devin
name: Oldenburg, Douglas W.
name: Shekhtman, Roman
Publisher: name: Zenodo
Year: 2021
Subjects: Magnetotellurics
ZTEM

description: E3DMT version 1 package is a program library for carrying out forward modelling and inversion of magnetotelluric and Z-axis tipper EM data 3D. Website: https://e3dmt.readthedocs.io/en/e3dmt/
title: Verkehrsverbünde und Planungsintegration in Stadtregionen
Creators: name: Kolm, Julian
Year: 2023

description: Diese Arbeit untersucht, wie die regionale Organisation von Verkehrsverbünden die Integration von Planungen in Stadtregionen beeinflusst. Die Analyse basiert auf einer Fallstudie zu einer Regionalbusausschreibung in der Stadtregion Wien. Trotz eines gemeinsamen Verkehrsverbundes der betroffenen Bundesländer führen getrennte Finanzierungsströme und unterschiedliche politische Ausrichtungen zu einer geringen räumlichen Integration der Verkehrsplanung. Eine Integration von Raum- und Verkehrsplanung wird durch eine schwach ausgeprägte regionale Entwicklungsplanung behindert. Informelle Institutionen überwinden fragmentierte Zuständigkeiten bei der Errichtung von Bushaltestellen. Pläne für die Integration von Regionalbus- und Bedarfsverkehrssystemen können als Reaktion auf die geringe Integration von Verkehrs- und Raumplanung und fragmentierte Siedlungsstrukturen interpretiert werden.
description: This thesis analyzes how the regional organization of transport association impacts on planning integration in city regions. The analysis is based on a case study of a public procurement process for regional bus services in the Vienna city region. Despite a common transport association of the affected Austrian states, separate funding streams and political differences lead to a low degree of spatial integration in transport planning. A weak regional planning system impedes the integration of land use and transport planning. Informal institutions are able to overcome fragmented administrative responsibilities related to the construction of bus stops. Plans to integrate regional bus and shared taxi services can be interpreted as a reaction to the low degree of integration between transport and land use planning and dispersed settlement patterns.
A High Precision, Optical Polarimeter to Measure Inclinations of High Mass X-Ray Binaries
Creators: name: Wiktorowicz, Sloane J.
name: Matthews, Keith
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present commissioning data for the POLISH instrument obtained on the Hale 5-m telescope. The goal of this high precision polarimeter is to constrain orbital inclination of high mass X-ray binaries and to therefore obtain independent mass estimates for their black hole companions. We have obtained photon shot noise limited precision on standard stars, and we have measured the polarization of bright stars at the part per million level on a nightly basis. Systematic effects have been reduced to less than 1% of the measured polarization for polarized sources and to the part per million level for weakly polarized sources. The high sensitivity of this instrument to asymmetry suggests that valuable contributions will be made in many other fields, including studies of extrasolar planets, debris disks, and stellar astrophysics.
description: 35 pages, 10 figures, accepted for publication in PASP
title: Estudio con RM de la anosmia congénita: Lo que el radiólogo debe saber
Creators: name: Castañeda Rodriguez, Lynda Yenny
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Congenital
subject: MR
subject: Ear / Nose / Throat
subject: Neuroradiology brain
subject: Head and neck

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
Las alteraciones del olfato son relativamente frecuentes y mayoritariamente secundarias a patología nasosinusal.
La anosmia congénita o de presentación en edad temprana es poco habitual y de difícil diagnóstico clínico.
Los test de olfato ,
la...
Stochastic cellular automata model of neural networks
Creators: name: Goltsev, A. V.
name: de Abreu, F. V.
name: Dorogovtsev, S. N.
name: Mendes, J. F. F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Biological Physics (physics.bio-ph)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We propose a stochastic dynamical model of noisy neural networks with complex architectures and discuss activation of neural networks by a stimulus, pacemakers and spontaneous activity. This model has a complex phase diagram with self-organized active neural states, hybrid phase transitions, and a rich array of behavior. We show that if spontaneous activity (noise) reaches a threshold level then global neural oscillations emerge. Stochastic resonance is a precursor of this dynamical phase transition. These oscillations are an intrinsic property of even small groups of 50 neurons.
description: 10 pages, 5 figures
title: Hígado e infección. Enfoque clínico-radiológico.
Creators: name: Flores Pereyra, Daniel
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Liver
subject: Education
subject: Interventional non-vascular
subject: Ultrasound
subject: CT
subject: MR
subject: Contrast agent-intravenous
subject: Decision analysis
subject: Abscess delineation
subject: Abscess
subject: Infection
subject: Neoplasia

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
Revisar los hallazgos por las diferentes técnicas de imagen (ecografía,
tomografía computarizada y resonancia magnética) de una amplia variedad de procesos inflamatorios e infecciosos que pueden afectar al hígado. Enfatizar la importancia que...
title: Everybody has the be Someplace: Twentieth-Centure Pedagogies of Place and Curricular Possibilities for the Intermountain West
Creators: name: Sheetz-Willard, Jacob
Publisher: name: Utah State University
Year: 2014

description: In 1977, riding a wave of environmental enthusiasm that had crested in the United States over the course of the previous decade, Wendell Berry published his classic agricultural jeremiad, The Unsettling of America. Berry, a novelist, poet, essayist, and farmer decried the environmental and cultural consequences of the large-scale, commercial agriculture that had overtaken the American landscape in the postwar years. He characterized the shift away from a producerist economy of independent farmers to a society oriented around consumption and growth as a Faustian bargain, an agricultural “colonialism” that devalued the individual and ravaged the land in the name of Progress. “It is necessary to account for a new intensity of greed,” he wrote, “a greed newly empowered, under no constraint to see itself as evil, allied (so it believes) with a manifest destiny and the way of the world.”1 Underlying the trend toward largescale industrial production and its accompanying ecological degradation, according to the author, was a Cartesian split – an insidious psychological dualism with deep roots in the Western tradition. Berry argued that a disembodied rationalism concerning economic affairs prevented Americans from fully acknowledging the environmental and cultural costs of their destructive relationship to the land. The severance of mind from body – the separation of physical and metaphysical realities – contributed to a literal and metaphoric uprooting, destroying in the process a moral order founded on the intuitive understanding of ecological principles. Generational knowledge and respect for place had lost out to the ideology of technological optimism and unlimited economic growth.
Inf-convolution of G-expectations
Creators: name: Bai, Xuepeng
name: Buckdahn, Rainer
Publisher: name: arXiv
Year: 2009
Subjects: subject: Risk Management (q-fin.RM)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 60H10, 60H05, 60H30

description: In this paper we will discuss the optimal risk transfer problems when risk measures are generated by G-expectations, and we present the relationship between inf-convolution of G-expectations and the inf-convolution of drivers G.
description: 23 pages
Testing real quantum theory in an optical quantum network
Creators: name: Li, Zheng-Da
name: Mao, Ya-Li
name: Weilenmann, Mirjam
name: Tavakoli, Armin
name: Chen, Hu
name: Feng, Lixin
name: Yang, Sheng-Jun
name: Renou, Marc-Olivier
name: Trillo, David
name: Le, Thinh P.
name: Gisin, Nicolas
name: Acín, Antonio
name: Navascués, Miguel
name: Wang, Zizhu
name: Fan, Jingyun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum theory is commonly formulated in complex Hilbert spaces. However, the question of whether complex numbers need to be given a fundamental role in the theory has been debated since its pioneering days. Recently it has been shown that tests in the spirit of a Bell inequality can reveal quantum predictions in entanglement swapping scenarios that cannot be modelled by the natural real-number analog of standard quantum theory. Here, we tailor such tests for implementation in state-of-the-art photonic systems. We experimentally demonstrate quantum correlations in a network of three parties and two independent EPR sources that violate the constraints of real quantum theory by over $4.5$ standard deviations, hence disproving real quantum theory as a universal physical theory.
description: 9 pages, 6 figures
CP Asymmetries in B->K pi, K*pi, rho K Decays
Creators: name: Gronau, Michael
name: Pirjol, Dan
name: Zupan, Jure
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We show that ratios of tree and penguin amplitudes in B-> K*pi and B->rho K are two to three times larger than in B-> K pi. This allows for considerably larger CP asymmetries in the former processes than the 10% asymmetry measured in B0 -> K+pi-. We study isospin sum rules for rate asymmetries in B-> K pi, K*pi, rho K, estimating small violation from interference of tree and electroweak penguin amplitudes. The breaking of the K pi asymmetry sum rule is estimated to be one to two percent and negative. Violation of K*pi and rho K sum rules can be estimated from B->rho pi amplitudes using flavor SU(3), while breaking of a sum rule combining K*pi and rho K asymmetries can be measured directly in a Dalitz analysis of B0-> K+pi-pi0. The three sum rules can be tested at the LHCb and at a future Super Flavor Factory, providing precision searches for new Delta S =Delta I=1 operators in the low energy effective Hamiltonian.
description: 21 pages, to be published in Physical Review D
Thermal entropy based hesitant fuzzy linguistic term set analysis in energy efficient opportunistic clustering
Creators: name: Anees, Junaid
name: Zhang, Hao-Chun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Limited energy resources and sensor nodes adaptability with the surrounding environment play a significant role in the sustainable Wireless Sensor Networks. This paper proposes a novel, dynamic, self-organizing opportunistic clustering using Hesitant Fuzzy Linguistic Term Analysis-based Multi-Criteria Decision Modeling methodology in order to overcome the CH decision making problems and network lifetime bottlenecks. The asynchronous sleep/awake cycle strategy could be exploited to make an opportunistic connection between sensor nodes using opportunistic connection random graph. Every node in the network observe the node gain degree, energy welfare, relative thermal entropy, link connectivity, expected optimal hop, link quality factor etc. to form the criteria for Hesitant Fuzzy Linguistic Term Set. It makes the node to evaluate its current state and make the decision about the required action (CH, CM or relay). The simulation results reveal that our proposed scheme leads to an improvement in network lifetime, packet delivery ratio and overall energy consumption against existing benchmarks.
description: 10 pages, 5 figures, International Conference on Networks and Communications (NETWORKS 2021)
title: Predicting Tourist Inflows to Punta Cana, Dominican Republic, Using Google Trends
Creators: name: De La Oz Pineda, Michelle E.
Publisher: name: Utah State University
Year: 2014

description: This paper seeks to demonstrate that the incorporation of search statistics in autoregressive models used to predict the arrivals of tourists to Punta Cana, Dominican Republic, improve the predictive power of the models. This paper explores whether the Internet search information in “Punta Cana” in the United States and Canada between January 2004 and August 2013, reflects the behavior of this variable in real time by using nowcasting methodology that combines variables with different frequencies of time. We find that including the searches of “Punta Cana” that Canadians make on Google in the first week of a month helps predict the actual arrival of Canadian tourists to Punta Cana in that month. The same applies in the case of Americans, but using the searches made during the third week of a month.
Growth and flowering of cranberry in relation to photoperiod and growth regulators
Creators: name: Lenhardt, Peter John
Publisher: name: University of British Columbia
Year: 2010

description: The relation of photoperiod and growth regulators to growth and the induction of flowering in cranberry, Vaccinium macrocarpon Ait. was studied. The various artificial day-lengths employed were provided in growth chambers or photoperiod cabinets in the greenhouse. Succinic acid 2,2-diraethylhydrazide (SADH) was applied both in the greenhouse and on a commercial bog. SADH was the primary growth regulator employed but others, namely gibberellic acid, cycocel, ancymidol and 6-benzylaminopurine were tested briefly. Paraffin sections of cranberry growing tips and terminal buds were employed to study flower initiation. Vegetative growth was found to be directly responsive to changes in daylength but no photoperiodic treatment was found that produced substantial initiation of floral parts. The flower initials that were found, occurred only under short day treatments of 9 or 12 hr. Probably they were artefacts of the alteration of some other physiological system and not direct results of photoperiod control. The normal timing of induction of flowering in British Columbia is similar to other areas where induction has been reported to occur during full bloom. SADH applied during full bloom on the bog increased flower induction. While SADH caused some retardation of growth, no important limitations of growth were found.
The thawing dark energy dynamics: Can we detect it?
Creators: name: Sen, S.
name: Sen, A. A.
name: Sami, M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider different classes of scalar field models including quintessence, and tachyon scalar fields with a variety of generic potential belonging to thawing type. Assuming the scalar field is initially frozen at $w=-1$, we evolve the system until the present time. We focus on observational quantities like Hubble parameter, luminosity distance as well as quantities related to the Baryon Acoustic Oscillation measurement. Our study shows that with present state of observations, one can not distinguish amongst various models which in turn can not be distinguished from cosmological constant. This lead us to a conclusion that there is a thin chance to observe the dark energy metamorphosis in near future.
description: 7 pages, Revtex Style, 6 eps figures, replaced with revised version, some figures are modified, minor changes, conclusions remain the same, Accepted for publication in Physics Letters B
Dimension reduction induced anisotropic magnetic thermal conductivity in hematite nanowire
Creators: name: Xi, Qing
name: Ayiti, Adili
name: Dong, Lan
name: Wang, Yuanyuan
name: Zhou, Jun
name: Xu, Xiangfan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The thermophysical properties near the magnetic phase transition point is of great importance in the study of critical phenomenon. Low-dimensional materials are suggested to hold different thermophysical properties comparing to their bulk counterpart due to the dimension induced quantum confinement and anisotropy. In this work, we measured the thermal conductivity of $α$-Fe$_2$O$_3$ nanowires along [110] direction (growing direction) with temperature from 100K to 150K and found a dip of thermal conductivity near the Morin temperature. We found the thermal conductivity near Morin temperature varies with the angle between magnetic field and [110] direction of nanowire. More specifically, an angular-dependent thermal conductivity is observed, due to the magnetic field induced movement of magnetic domain wall. The angle corresponding to the maximum of thermal conductivity varies near the Morin transition temperature, due to the different magnetic easy axis as suggested by our calculation based on magnetic anisotropy energy. This angular dependence of thermal conductivity indicates that the easy axis of $α$-Fe$_2$O$_3$ nanowires is different from bulk $α$-Fe$_2$O$_3$ due to the geometric anisotropy.
Constraints on Mass Spectrum of Fourth Generation Fermions and Higgs Bosons
Creators: name: Hashimoto, Michio
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We reanalyze constraints on the mass spectrum of the chiral fourth generation fermions and the Higgs bosons for the standard model (SM4) and the two Higgs doublet model (THDM). We find that the Higgs mass in the SM4 should be larger than roughly the fourth generation up-type quark mass, while the light CP even Higgs mass in the THDM can be smaller. Various mass spectra of the fourth generation fermions and the Higgs bosons are allowed. The phenomenology of the fourth generation models is still rich.
description: 15 pages, 16 figures; some points clarified, references added, to appear in Phys.Rev.D
Tracking Quintessence and Cold Dark Matter Candidates
Creators: name: Lola, S.
name: Pallis, C.
name: Tzelati, E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the generation of a kination-dominated phase in the context of a quintessential model with an inverse-power-law potential and a Hubble-induced mass term for the quintessence field. The presence of kination is associated with an oscillating evolution of the quintessence field and the barotropic index. We find that, in sizeable regions of the parameter space, a tracker scaling solution can be reached sufficiently early to alleviate the coincidence problem. Other observational constraints originating from nucleosynthesis, the inflationary scale, the present acceleration of the universe and the dark-energy-density parameter can be also met. The impact of this modified kination-dominated phase on the thermal abundance of cold dark matter candidates is investigated too. We find that: (i) the enhancement of the relic abundance of the WIMPs with respect to the standard paradigm, crucially depends on the hierarchy between the freeze-out temperature and the temperature at which the extrema in the evolution of the quintessence field are encountered, and (ii) the relic abundance of e-WIMPs takes its present value close to the temperature at which the earliest extremum of the evolution of the quintessence field occurs and, as a consequence, both gravitinos and axinos arise as natural cold dark matter candidates. In the case of unstable gravitinos, the gravitino constraint can be satisfied for values of the initial temperature well above those required in the standard cosmology.
description: Final version
title: Manejo del Síndrome Aórtico Agudo (SAA)
Creators: name: Quintana de la Cruz, Rosa
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Thorax
subject: Abdomen
subject: CT
subject: CT-Angiography

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
1.
Describir las entidades que comprenden el síndrome aórtico agudo (SAA),
sus mecanismos fisiopatológicos,
las características clínicas y la valoración de los hallazgos radiológicos 2.
Conocer el papel del radiólogo como parte fundamental...
A new cell typing method
Creators: name: 张莹(ZhangYing)
Publisher: name: CNGB
Year: 2024
Subjects: Raw sequence reads
Transcriptome or Gene expression
Multiisolate

description: A novel method (Spatial-ID) was represented for cell annotation. A series of comparison experiments demonstrate the superiority of this method in cell type annotation compared with other state-of-the-art methods. Besdes, the application of Spatial-ID on a Stereo-seq SRT dataset with 3D spatial dimension shows its advancement on the large field tissues (~1cm2) with subcellular spatial resolution. Moreover, by mapping the identified cell types with identified spatial gene patterns, the significant GO terms of the spatial gene patterns further reveal the functions and underlying biological processes of the identified cell types.
title: ¿Cuál es la mejor técnica complementaria a la Mamografía Digital para aumentar su sensibilidad: Tomosíntesis, Ecografía o ambas?
Creators: name: Elizalde, Arlette
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Breast
subject: Mammography
subject: Ultrasound
subject: Technology assessment
subject: Neoplasia

description: Objetivos
Material y método
Resultados
Conclusiones
Bibliografía
description: Objetivos:
Introducción La mamografía es la única técnica diagnóstica aceptada para el diagnóstico precoz del cáncer de mama que ha demostrado reducir la mortalidad por esta causa. Sin embargo,
su rango de sensibilidad oscila entre un 68% (que puede...
Quantum states prepared by realistic entanglement swapping
Creators: name: Scherer, Artur
name: Howard, Regina B.
name: Sanders, Barry C.
name: Tittel, Wolfgang
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entanglement swapping between photon pairs is a fundamental building block in schemes using quantum relays or quantum repeaters to overcome the range limits of long-distance quantum key distribution. We develop a closed-form solution for the actual quantum states prepared by realistic entanglement swapping, which takes into account experimental deficiencies due to inefficient detectors, detector dark counts, and multiphoton-pair contributions of parametric down-conversion sources. We investigate how the entanglement present in the final state of the remaining modes is affected by the real-world imperfections. To test the predictions of our theory, comparison with previously published experimental entanglement swapping is provided.
description: 44 pages, 7 figures, Published with minor changes in Phys. Rev. A
Optical linear polarization in ultra cool dwarfs: A tool to probe dust in the ultra cool dwarf atmospheres
Creators: name: Tata, R.
name: Martin, E. L.
name: Sengupta, S.
name: Phan-Bao, N.
name: Osorio, M. R. Zapatero
name: Bouy, H.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims.Recent studies have detected linear polarization in L dwarfs in the optical I band. Theoretical models have been developed to explain this polarization. These models predict higher polarization at shorter wavelengths. We discuss the polarization in the R and I band of 4 ultra cool dwarfs. Methods.We report linear polarization measurements of 4 ultra cool dwarfs in the R and I bands using the Intermediate dispersion Spectrograph and Imaging System (ISIS) mounted on the 4.2m William Herschel Telescope (WHT). Results.As predicted by theoretical models, we find a higher degree of polarization in the R band when compared to polarization in the I band for 3/4 of these ultra cool dwarfs. This suggests that dust scattering asymmetry is caused by oblateness >.We also show how these measurements fit the theoretical models. A case for variability of linear polarization is found, which suggests the presence of randomly distributed dust clouds. We also discuss one case for the presence of a cold debris disk.
description: 7 pages, 2 figures
SteelCore: An Extensible Concurrent Separation Logic for Effectful Dependently Typed Programs
Creators: name: Swamy, Nikhil
name: Rastogi, Aseem
name: Fromherz, Aymeric
name: Merigoux, Denis
name: Ahman, Danel
name: Martínez, Guido
Publisher: name: arXiv
Year: 2021
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Much recent research has been devoted to modeling effects within type theory. Building on this work, we observe that effectful type theories can provide a foundation on which to build semantics for more complex programming constructs and program logics, extending the reasoning principles that apply within the host effectful type theory itself. Concretely, our main contribution is a semantics for concurrent separation logic (CSL) within the F* proof assistant in a manner that enables dependently typed, effectful F* programs to make use of concurrency and to be specified and verified using a full-featured, extensible CSL. In contrast to prior approaches, we directly derive the partial-correctness Hoare rules for CSL from the denotation of computations in the effectful semantics of non-deterministically interleaved atomic actions. Demonstrating the flexibility of our semantics, we build generic, verified libraries that support various concurrency constructs, ranging from dynamically allocated, storable spin locks, to protocol-indexed channels. We conclude that our effectful semantics provides a simple yet expressive basis on which to layer domain-specific languages and logics for verified, concurrent programming.
description: ICFP 2020 camera-ready version
Stability of thin-shell wormholes supported by ordinary matter in Einstein-Maxwell-Gauss-Bonnet gravity
Creators: name: Mazharimousavi, S. Habib
name: Halilsoy, M.
name: Amirabi, Z.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently in (Phys. Rev. D 76, 087502 (2007) and Phys. Rev. D 77, 089903(E) (2008)) a thin-shell wormhole has been introduced in 5-dimensional Einstein-Maxwell-Gauss-Bonnet (EMGB) gravity which was supported by normal matter. We wish to consider this solution and investigate its stability. Our analysis shows that for the Gauss-Bonnet (GB) parameter $α<0,$ stability regions form for a narrow band of finely-tuned mass and charge. For the case $α>0$, we iterate once more that no stable, normal matter thin-shell wormhole exists.
description: 11 pages, 4 figures
Excitons in single-walled carbon nanotubes: environmental effect
Creators: name: Smyrnov, Oleksii A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The properties of excitons in semiconducting single-walled carbon nanotubes (SWCNTs), isolated in vacuum or a medium, and their contributions to the optical spectra of nanotubes are studied within the elementary potential model, in which an exciton is represented as a bound state of two oppositely charged quasi-particles confined to the nanotube surface. The emphasis is given on the influence of dielectric environment surrounding a nanotube on the exciton spectra. For nanotubes in environment with permittivity less than 1.8 the ground-state exciton binding energies exceed the respective energy gaps, while the obtained binding energies of excitons in nanotubes in a medium with permittivity greater than 4 are in good accordance with the corresponding experimental data and consistent with known scaling relation for the environmental effect. The stabilization process of single-electron spectrum in SWCNTs in media with rather low permittivities is discussed.
description: 8 pages, 4 figures, 2 tables
Influence of the Local Void on measurements of the clustering dipole
Creators: name: Bilicki, Maciej
name: Chodorowski, Michał
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In measurements of the clustering dipole from all-sky surveys, an important problem is the lack of information about galaxy distribution in the so-called Zone of Avoidance (ZoA). The existence of the Local Void (LV) has a systematic effect on these measurements. If the ZoA is randomly filled with mock galaxies, then the calculated acceleration of the Local Group of galaxies (LG) has a spurious component, resulting from the lack of real galaxies in the intersection of the LV with the ZoA. This component affects both the misalignment angle between the clustering dipole and the CMB dipole, and the inferred value of mean matter density Omega_m. We calculate the amplitude of the spurious acceleration acting on the LG due to the LV. Its value depends on the geometry and size of the LV, as well as on its density contrast. However, under the simplest assumption of the LV being spherical and completely empty, within the linear theory this amplitude amounts only to about 45 km/s in units of velocity. The resulting change in the misalignment angle is smaller than 1 degree, and the fractional change in the deduced value of Omega_m is about 5%. Accounting for observationally indicated elongation of the LV and maintaining the maximising assumption of a complete lack of galaxies inside increases these numbers only moderately. Specifically, the amplitude of the spurious acceleration rises to about 60 km/s, the misalignment angle remains still smaller than 1 degree, and the fractional change in the deduced value of Omega_m is enhanced to about 7%. Thus, despite the overall importance of the Local Void for the motion of the Local Group, the influence of the intersection of the LV with the ZoA on measurements of the clustering dipole is found to be only a minor systematic effect.
description: 6 pages, 2 figures; revised version, slightly expanded, accepted for publication in MNRAS.
Single-particle machine for quantum thermalization
Creators: name: Liao, Jie-Qiao
name: Dong, H.
name: Sun, C. P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The long time accumulation of the \textit{random} actions of a single particle "reservoir" on its coupled system can transfer some temperature information of its initial state to the coupled system. This dynamic process can be referred to as a quantum thermalization in the sense that the coupled system can reach a stable thermal equilibrium with a temperature equal to that of the reservoir. We illustrate this idea based on the usual micromaser model, in which a series of initially prepared two-level atoms randomly pass through an electromagnetic cavity. It is found that, when the randomly injected atoms are initially prepared in a thermal equilibrium state with a given temperature, the cavity field will reach a thermal equilibrium state with the same temperature as that of the injected atoms. As in two limit cases, the cavity field can be cooled and "coherently heated" as a maser process, respectively, when the injected atoms are initially prepared in ground and excited states. Especially, when the atoms in equilibrium are driven to possess some coherence, the cavity field may reach a higher temperature in comparison with the injected atoms. We also point out a possible experimental test for our theoretical prediction based on a superconducting circuit QED system.
description: 9 pages,4 figures,
title: Care and Feeding: An Exploration of How Archaeology Site Stewardship Program Volunteers and Managers Define Priorities
Creators: name: McNamara, Britt
Publisher: name: Utah State University
Year: 2013

description: State and federal agencies increasingly rely on site stewardship programs to protect archaeological resources, and site stewardship programs rely on volunteers to do this work. Given the importance of volunteers to site stewardship programs, especially in the wake of budget cuts and “sequesters,” this paper asks: how do managers and volunteers define site stewardship program priorities and how do differences in their opinions impact program success? In this paper, I briefly review the literature on site stewardship programs and volunteerism and present the results of my exploratory ethnographic research on this question. I close with a discussion about how differing volunteer and manager priorities affect volunteer retention and offer some thoughts on future directions for research.
The terms “volunteer” and “steward” are used interchangeably in this paper because both refer to a person who gives his or her time without remuneration to monitor archaeological sites in order to protect and preserve cultural resources and heritage. The term manager is used to describe agency archaeologists, heritage coordinators, and other staff members who oversee aspects of an archaeological site stewardship program. A site stewardship coordinator or a program coordinator is defined, for purposes of this paper, as a person who interacts directly with volunteers. Among the coordinator’s responsibilities are tasks such as keeping track of the program budget, organizing training, writing program status reports, and responding to volunteer questions and concerns.
Researching the ways in which different priorities impact volunteer satisfaction and subsequent program success or failure gives archaeologists and land managers more tools to address volunteer needs so that site stewardship programs can remain viable. Additionally, my research expands the literature on site stewardship programs to include a more volunteer-centric view of these programs. This is useful because volunteers are crucial to the operation of site stewardship programs and listening to their needs and concerns will improve volunteer motivation and retention.
The Effective Potential of the Conformal Factor in Asymptotically Safe Quantum Gravity
Creators: name: Daum, Jan-Eric
name: Reuter, Martin
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The effective potential of the conformal factor in the effective average action approach to Quantum Einstein Gravity is discussed. It is shown, without invoking any truncation or other approximations, that if the theory has has a non-Gaussian ultraviolet fixed point and is asymptotically safe the potential has a characteristic behavior near the origin. This behavior might be observable in numerical simulations.
description: 15 pages, 1 figure, talk given by Jan-Eric Daum at CLAQG08
title: An Analysis on Soil Properties on Predicting Critical Hydraulic Gradients for Piping Progression in Sandy Soils
Creators: name: Jacobson, Tammy
Publisher: name: Utah State University
Year: 2013

description: Piping is a form of internal erosion in which soil particles are eroded at a seepage exit location due to the forces imposed on the particles by seeping water. Laboratory testing was performed on a variety of soils in order to assess a correlation between unit weight, angle of internal friction, grain size, gradation, and void ratio and the critical hydraulic gradient at which piping initiates and progresses. A multi-variable regression analysis was used to form equations to predict critical hydraulic gradient based upon each of these soil parameters. Variations in the accuracy of these equations are thought to be due to the interlocking behavior of the angular soils tested compared to that of the more spherical soils as well as the loosening of the sample and change in void ratio as piping progresses.
A Cinematographic Ode to Life in a Single Shot
Creators: name: Formenti, Cristina
Publisher: name: Università degli  Studi di Milano
Year: 2014

description: A Cinematographic Ode to Life
in a Single Shot
In conversation with director John Paul Sniadeki1
(10 May 2013)
by Cristina Formenti
description: Altre Modernità, No 11 (2014): Spionaggi
title: Methylmercury Fate in the Hypersaline Environment of the Great Salt Lake: A Critical Review of Current Knowledge
Creators: name: Barandiaran, Danielle
Publisher: name: Utah State University
Year: 2013

description: Methylmercury (MeHg) is a highly potent neurotoxic form of the environmental pollutant Mercury (Hg). The processes that are responsible for the conversion of Hg to MeHg are known to be both biotic and abiotic in freshwater systems. Although MeHg contamination is well documented in Great Salt Lake (GSL), the conversion of Hg into MeHg is not well-understood in saline environments much less in hypersaline waters such as GSL. The GSL is a broad, shallow high altitude (1280 m above sea level) lake that is exposed to large amounts of ultraviolet radiation and evaporation, which lead to great volatilization losses of Hg to the atmosphere that may in turn contaminate other bodies of water. In this review biotic and abiotic Hg methylation pathways that are known to occur in marine environments, are investigated to identify the most likely causes for the high amounts of MeHg present in GSL.
Upper limits on Einstein's weak equivalence principle placed by uncertainties of dispersion measures of fast radio bursts
Creators: name: Hashimoto, Tetsuya
name: Goto, Tomotsugu
name: Santos, Daryl Joe D.
name: Ho, Simon C. -C.
name: Kilerci-Eser, Ece
name: Hsiao, Tiger Y. -Y.
name: Wong, Yi Hang Valerie
name: On, Alvina Y. L.
name: Kim, Seong Jin
name: Lu, Ting-Yi
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Fast radio bursts (FRBs) are astronomical transients with millisecond timescales occurring at cosmological distances. The observed time lag between different energies of each FRB is well described by the inverse-square law of the observed frequency, i.e., dispersion measure. Therefore, FRBs provide one of the ideal laboratories to test Einstein's weak equivalence principle (WEP): the hypothetical time lag between photons with different energies under a gravitational potential. If WEP is violated, such evidence should be exposed within the observational uncertainties of dispersion measures, unless the WEP violation also depends on the inverse-square of the observed frequency. In this work, we constrain the difference of gamma parameters ($Δγ$) between photons with different energies using the observational uncertainties of FRB dispersion measures, where $Δγ=0$ for Einstein's general relativity. Adopting the averaged 'Shapiro time delay' for cosmological sources, FRB 121002 at $z=1.6\pm0.3$ and FRB 180817.J1533+42 at $z=1.0\pm0.2$ place the most stringent constraints of $\logΔγ
description: Accepted for publication in Physical Review D. A summary video is available at https://youtu.be/Rt7tXN02wpQ
title: Students Rise to the Challenge of Modeling Yeast Growth Despite Sour Hiccups from Imperfect Data
Creators: name: Caldwell, Alicia
Publisher: name: Utah State University
Year: 2013

description: Students rarely receive the opportunity to experience a learning activity involving mathematical modeling. This paper describes a lab in which students in an Applied Mathematics in Biology course observe the growth of Saccharomyces cerevisiae, a yeast strain, in differing sugar concentrations for use in learning modeling. They parameterized the logistic equation and an alternate model, which they themselves constructed, based on the data they collected. I participated in this lab as a student in 2012 then observed and reviewed the work of other students involved. I found that students gained a deeper understanding of limiting factors and the role of parameter values in a model. Creative approaches were applied and problem solving skills refined as students exposed themselves to the modeling process. Student results and methodology are discussed.
Embrace extinction or die trying
Creators: name: Brown, Josh
name: Burton, Adrian
name: Simons, Natasha
Publisher: name: Zenodo
Year: 2021
Subjects: persistent identifiers
evolution
diversity

description: Our raPID embrace of digital technology has created an incredibly fertile ground for innovations and transformations across the research world, from exascale data to the digital humanities. The novelty and potential of this new environment has prompted the creation of new kinds of entities, and many variations in the ways we identify them. This fertile, rapidly evolving context is analogous to the proliferation of new life during the Cambrian Explosion. 541 million years ago, the ancestors of most modern life forms sprang into being, evolving to occupy countless niches in the prehistoric ecosystem. The current PID landscape has many similar ‘niche dwellers’ - PIDs that have been developed to meet the needs of specific communities, disciplinary practices and leverage new technologies. As we hear more calls for simplification of the landscape, and consolidation around a few (or sometimes just one) PID system, why not embrace diversity instead? Consider: which of the Cambrian species could have predicted how evolution would progress? As practices evolve and consolidate, and technology shifts, some PID systems may well die out. That’s not necessarily a problem - as long as the information they hold can still be used by future generations.That said, having established the essential role of diversity we also investigate if it is also possible to sometimes have too much of a good thing… If you can only survive under very specific conditions and can’t interact with anything outside your niche, maybe you’ve stumbled into an evolutionary dead end?

 We invite you to join us on a journey through the raPID evolution of PIDs, and ask why would we seek to narrow our field of innovation at this critical moment in PID evolution? Instead, we would argue that we should embrace diversity instead - while designing for extinction.