cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the contribution of nearby sources to the observed cosmic-ray nuclei
Creators: name: Thoudam, Satyendra
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The presence of nearby discrete cosmic-ray (CR) sources can lead to many interesting effects on the observed properties of CRs. In this paper, we study about the possible effects on the CR primary and secondary spectra and also the subsequent effects on the CR secondary-to-primary ratios. For the study, we assume that CRs undergo diffusive propagation in the Galaxy and we neglect the effect of convection, energy losses and reacceleration. In our model, we assume that there exists a uniform and continuous distribution of CR sources in the Galaxy generating a stationary CR background at the Earth. In addition, we also consider the existence of some nearby sources which inject CRs in a discrete space-time model. Assuming a constant CR source power throughout the Galaxy, our study has found that the presence of nearby supernova remnants (SNRs) produces noticeable variations in the primary fluxes mainly above ~ 100 GeV/n, if CRs are assumed to be released instantaneously after the supernova explosion. The variation reaches a value of ~ 45% at around 10^5 GeV/n. Respect to earlier studies, the variation in the case of the secondaries is found to be almost negligible. We also discuss about the possible effects of the different particle release times from the SNRs. For the particle release time of ~ 10^5 yr, predicted by the diffusive shock acceleration theories in SNRs, we have found that the presence of the nearby SNRs hardly produces any significant effects on the CRs at the Earth.
description: 12 pages, 8 figures, 2 tables, accepted for publication in MNRAS
Learning Feature Weights for Density-Based Clustering
Creators: name: Chowdhury, Stiphen
Publisher: name: UH Research Archive
Year: 2021
Subjects: clustering
density-based clustering
feature weighting
feature selection
DBSCAN
reverse nearest neighbour

description: K-Means is the most popular and widely used clustering algorithm. This algorithm cannot recover non-spherical shape clusters in data sets. DBSCAN is arguably the most popular algorithm to recover arbitrary shape clusters; this is why this density-based clustering algorithm is of great interest to tackle its weaknesses. One issue of concern is that DBSCAN requires two parameters, and it cannot recover widely variable density clusters. The problem lies at the heart of this thesis is that during the clustering process DBSCAN takes all the available features and treats all the features equally regardless of their degree of relevance in the data set, which can have negative impacts. This thesis addresses the above problems by laying the foundation of the feature weighted density-based clustering. Specifically, the thesis introduces a densitybased clustering algorithm using reverse nearest neighbour, DBSCANR that require less parameter than DBSCAN for recovering clusters. DBSCANR is based on the insight that in real-world data sets the densities of arbitrary shape clusters to be recovered within a data set are very different from each other. The thesis extends DBSCANR to what is referred to as weighted DBSCANR, WDBSCANR by exploiting feature weighting technique to give the different level of relevance to the features in a data set. The thesis extends W-DBSCANR further by using the Minkowski metric so that the weight can be interpreted as feature re-scaling factors named MW-DBSCANR. Experiments on both artificial and realworld data sets demonstrate the superiority of our method over DBSCAN type algorithms. These weighted algorithms considerably reduce the impact of irrelevant features while recovering arbitrary shape clusters of different level of densities in a high-dimensional data set. Within this context, this thesis incorporates a popular algorithm, feature selection using feature similarity, FSFS into bothW-DBSCANR andMW-DBSCANR, to address the problem of feature selection. This unsupervised feature selection algorithm makes use of feature clustering and feature similarity to reduce the number of features in a data set. With a similar aim, exploiting the concept of feature similarity, the thesis introduces a method, density-based feature selection using feature similarity, DBFSFS to take density-based cluster structure into consideration for reducing the number of features in a data set. This thesis then applies the developed method to real-world high-dimensional gene expression data sets. DBFSFS improves the clustering recovery by substantially reducing the number of features from high-dimensional low sample size data sets.
Imaging antiferromagnetic domain fluctuations and the effect of atomic-scale disorder in a doped spin-orbit Mott insulator
Creators: name: Zhao, He
name: Porter, Zach
name: Chen, Xiang
name: Wilson, Stephen D.
name: Wang, Ziqiang
name: Zeljkovic, Ilija
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Correlated oxides can exhibit complex magnetic patterns, characterized by domains with vastly different size, shape and magnetic moment spanning the material. Understanding how magnetic domains form in the presence of chemical disorder and their robustness to temperature variations has been of particular interest, but atomic-scale insight into this problem has been limited. We use spin-polarized scanning tunneling microscopy to image the evolution of spin-resolved modulations originating from antiferromagnetic (AF) ordering in a spin-orbit Mott insulator Sr3Ir2O7 as a function of chemical composition and temperature. We find that replacing only several percent of La for Sr leaves behind nanometer-scale AF puddles clustering away from La substitutions preferentially located in the middle SrO layer within the unit cell. Thermal erasure and re-entry into the low-temperature ground state leads to a spatial reorganization of the AF modulations, indicating multiple stable AF configurations at low temperature. Interestingly, regardless of this rearrangement, the AF puddles maintain scale-invariant fractal geometry in each configuration. Our experiments reveal spatial fluctuations of the AF order in electron doped Sr3Ir2O7, and shed light on its sensitivity to different types of atomic-scale disorder.
Empirical distributions of Chinese stock returns at different microscopic timescales
Creators: name: Gu, Gao-Feng
name: Chen, Wei
name: Zhou, Wei-Xing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We study the distributions of event-time returns and clock-time returns at different microscopic timescales using ultra-high-frequency data extracted from the limit-order books of 23 stocks traded in the Chinese stock market in 2003. We find that the returns at the one-trade timescale obey the inverse cubic law. For larger timescales (2-32 trades and 1-5 minutes), the returns follow the Student distribution with power-law tails. With the decrease of timescale, the tail becomes fatter, which is consistent with the vibrational theory.
description: 14 Elsart page including 2 tables and 3 figures
Scalar-field perturbations from a particle orbiting a black hole using numerical evolution in 2+1 dimensions
Creators: name: Barack, Leor
name: Golbourn, Darren A
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a new technique for time-domain numerical evolution of the scalar field generated by a pointlike scalar charge orbiting a black hole. Time-domain evolution offers an efficient way for calculating black hole perturbations, especially as input for computations of the local self force acting on orbiting particles. In Kerr geometry, the field equations are not fully separable in the time domain, and one has to tackle them in 2+1 dimensions (two spatial dimensions and time; the azimuthal dependence is still separable). A technical difficulty arises when the source of the field is a pointlike particle, as the 2+1-dimensional perturbation is then singular: Each of the azimuthal modes diverges logarithmically at the particle. To deal with this problem we split the numerical domain into two regions: Inside a thin worldtube surrounding the particle's worldline we solve for a regularized variable, obtained from the full field by subtracting out a suitable ``puncture'' function, given analytically. Outside this worldtube we solve for the full, original field. The value of the evolution variable is adjusted across the boundary of the worldtube. In this work we demonstrate the applicability of this method in the example of circular orbits around a Schwarzschild black hole (refraining from exploiting the spherical symmetry of the background, and working in 2+1 dimensions).
description: Accepted for publication in PRD, minor typographical corrections, references updated, 25 pages, 22 eps figures
Ferromagnetic Ising spin systems on the growing random tree
Creators: name: Hasegawa, Takehisa
name: Nemoto, Koji
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We analyze the ferromagnetic Ising model on a scale-free tree; the growing random network model with the linear attachment kernel $A_k=k+α$ introduced by [Krapivsky et al.: Phys. Rev. Lett. {\bf 85} (2000) 4629-4632]. We derive an estimate of the divergent temperature $T_s$ below which the zero-field susceptibility of the system diverges. Our result shows that $T_s$ is related to $α$ as $\tanh(J/T_s)=α/[2(α+1)]$, where $J$ is the ferromagnetic interaction. An analysis of exactly solvable limit for the model and numerical calculation support the validity of this estimate.
description: 15 pages, 5 figures
J/psi->VP decays and the quark and gluon content of the eta and eta'
Creators: name: Escribano, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The $η$-$η^\prime$ pseudoscalar mixing angle and the gluonium content of the $η^\prime$ meson are deduced from an updated phenomenological analysis of $J/ψ$ decays into a vector and a pseudoscalar meson. In absence of gluonium, the value of the mixing angle in the quark-flavour basis is found to be $ϕ_P=(40.7\pm 2.3)^\circ$. In presence of gluonium, the values for the mixing angle and the gluonic content of the $η^\prime$ wave function are $ϕ_P=(44.6\pm 4.4)^\circ$ and $Z^2_{η^\prime}=0.29^{+0.18}_{-0.26}$, respectively. The newly reported values of $B(J/ψ\toρπ)$ by the BABAR and BES Collaborations are crucial to get a consistent description of data.
description: 7 pages, 1 figure, uses svjour style. Comments on the relationship between J/psi to VP and V to Pgamma decays and on the neglected contributions together with an asymmetric treatment of errors are included
Spectral state transitions in Circinus ULX5
Creators: name: Mondal, Samaresh
name: Rozanska, Agata
name: Baginska, Patrycja
name: Markowitz, Alex
name: De Marco, Barbara
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We performed timing and spectral analysis of multi-epoch Suzaku, XMM-Newton and NuSTAR observations of the ultraluminous X-ray source (ULX) Circinus ULX5, to put constraints on the mass of the central object and the accretion mode operating in this source. We aim to answer whether the source contains a stellar mass black hole with a super-Eddington accretion flow or an intermediate mass black hole accreting matter in a sub-Eddington mode. Moreover, we search for major observed changes in spectra and timing occur, and determine if they are associated with major structural changes in the disk, similar to those in black hole X-ray binaries. We performed timing and spectral analysis to study the relation between luminosity and inner disk temperature. We constructed the hardness ratio versus intensity diagram to reveal spectral state transitions in Circinus ULX5. Our spectral analysis revealed at least three distinctive spectral states of Circinus ULX5, in analogy to state transitions in Galactic black hole X-ray binaries. Disk-dominated spectra are found in high flux states and the power-law dominated spectra are found in lower flux states. The source was also observed in an intermediate state, where the flux was low, but spectrum is dominated by a disk component. Over eighteen years of collected data, ULX5 appeared two times in the high, three times in the low, and two times in the intermediate state. The fastest observed transition was $\sim$7 months. Our analysis suggests that the central object in Circinus ULX5 is a stellar mass BH ($<10\ \rm M_{\odot}$), or possibly a NS even though we do not detect pulsations in the lightcurves. Fractional variability amplitudes are consistent with state transitions in Circinus ULX5 wherein higher variability from the power law-like Comptonized emission gets suppressed in the thermal disk-dominated state.
description: 13 pages, 13 figures, accepted for publication in A&A
INTEGRATION OF REMOTELY SENSED DATA AND FOREST LANDSCAPE PATTERN ANALYSIS IN SAKAERAT BIOSPHERE RESERVE
Creators: name: Suwit Ongsomwang
name: Intareeya Sutthivanich
Publisher: name: Suaranaree University of Technology
Year: 2014
Subjects: Sakaerat Biosphere Reserve, landscape metrics, landscape ecology, forest ecology, forest restoration and management plan

description: 3, 21, Suranaree Journal of Science and Technology
MHD simulations of the magnetorotational instability in a shearing box with zero net flux. I. The issue of convergence
Creators: name: Fromang, S.
name: Papaloizou, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the properties of MHD turbulence driven by the magnetorotational instability (MRI) in accretion disks. We adopt the local shearing box model and focus on the special case for which the initial magnetic flux threading the disk vanishes. We employ the finite difference code ZEUS to evolve the ideal MHD equations. Performing a set of numerical simulations in a fixed computational domain with increasing resolution, we demonstrate that turbulent activity decreases as resolution increases. We quantify the turbulent activity by measuring the rate of angular momentum transport through evaluating the standard alpha parameter. We find alpha=0.004 when (N_x,N_y,N_z)=(64,100,64), alpha=0.002 when (N_x,N_y,N_z)=(128,200,128) and alpha=0.001 when (N_x,N_y,N_z)=(256,400,256). This steady decline is an indication that numerical dissipation, occurring at the grid scale is an important determinant of the saturated form of the MHD turbulence. Analysing the results in Fourier space, we demonstrate that this is due to the MRI forcing significant flow energy all the way down to the grid dissipation scale. We also use our results to study the properties of the numerical dissipation in ZEUS. Its amplitude is characterised by the magnitude of an effective magnetic Reynolds number Re_M which increases from 10^4 to 10^5 as the number of grid points is increased from 64 to 256 per scale height. The simulations we have carried out do not produce results that are independent of the numerical dissipation scale, even at the highest resolution studied. Thus it is important to use physical dissipation, both viscous and resistive, and to quantify contributions from numerical effects, when performing numerical simulations of MHD turbulence with zero net flux in accretion disks at the resolutions normally considered.
description: 10 pages, 15 figures, accepted in A&A. Numerical results improved, various numerical issues addressed (boundary conditions, box size, run durations)
Developing Metrics for Assessing the Impact of Open Science Services
Creators: name: Wang, Huajin
name: Gainey, Melanie
name: Campbell, Patrick
name: Behrman, Katie
name: Young, Sarah
Publisher: name: Zenodo
Year: 2021
Subjects: open science
assessment metrics
library services

description: The future of scholarly communication requires researchers to share data and other research products, in accordance with open science principles. Open science not only helps satisfy funder and publisher mandates and accelerate the dissemination of research, but importantly, facilitates collaboration and makes research more reproducible and reusable. Many academic institutions have established institutional repositories and open-access programs to support open data and publishing. However, these initiatives often emphasize the end product of research. At Carnegie Mellon University, we implemented the Open Science & Data Collaborations (OSDC) program, within University Libraries, that helps embed open science practices into the entire research lifecycle by providing tools, training, opportunities for collaboration, community-building events, and advocacy. The OSDC program has supported numerous researchers and their projects and has created strong partnerships with academic departments and university leadership. Recently, we have turned our attention to developing metrics to evaluate the impact of the program and open science more broadly on research activity. We first collected data that includes event and workshop registrations, platform usage, and feedback from a user advisory group. Analysis of this dataset, along with a logic model that depicts the program activity and outcomes, will help to develop more in-depth evaluation metrics and a toolkit, launch targeted surveys, and identify priority service areas and interesting open science projects. Our program implementation and assessment can serve as a model for others to implement open science initiatives on their campuses. We also welcome partnership with other universities to form an alliance of open science programs that supports open science as it continues to evolve.
Nonlinear control of chaotic walking of atoms in an optical lattice
Creators: name: Yu, Argonov V.
name: Prants, S. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Centre-of-mass atomic motion in an optical lattice near the resonance is shown to be a chaotic walking due to the interplay between coherent internal atomic dynamics and spontaneous emission. Statistical properties of chaotic atomic motion can be controlled by the single parameter, the detuning between the atomic transition frequency and the laser frequency. We derive a Fokker-Planck equation in the energetic space to describe the atomic transport near the resonance and demonstrate numerically how to manipulate the atomic motion varying the detuning.
description: 6 pages, 4 figures
The Usability and Trustworthiness of Medical Eye Images
Creators: name: Diethei, Daniel
name: Colley, Ashley
name: Dannenberg, Lisa
name: Malik, Muhammad Fawad Jawaid
name: Schöning, Johannes
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: The majority of blindness is preventable, and is located in developing countries. While mHealth applications for retinal imaging in combination with affordable smartphone lens adaptors are a step towards better eye care access, the expert knowledge and additional hardware needed are often unavailable in developing countries. Eye screening apps without lens adaptors exist, but we do not know much about the experience of guiding users to take medical eye images. Additionally, when an AI based diagnosis is provided, trust plays an important role in ensuring in the adoption. This work addresses factors that impact the usability and trustworthiness dimensions of mHealth applications. We present the design, development and evaluation of EyeGuide, a mobile app that assists users in taking medical eye images using only their smartphone camera. In a study (n=28) we observed that users of an interactive tutorial captured images faster compared to audible tone based guidance. In a second study (n=40) we found out that providing disease-specific background information was the most effective factor to increase trustworthiness in the AI based diagnosis. Application areas of EyeGuide are AI based disease detection and telemedicine examinations.
การประยุกต์ใช้แนวทางการบริหารจัดการแบบลีนเพื่อเพิ่มประสิทธิภาพสำหรับการแจ้งเตือนกิจกรรมด้วย Google Calendar กรณีศึกษา คณะวิศวกรรมศาสตร์ มหาวิทยาลัยเทคโนโลยีราชมงคลศรีวิชัย
Creators: name: เพ็ญพักตร แกล้วทนงค์
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: ลีน, การแจ้งเตือนกิจกรรม, ประสิทธิภาพ

description: 2, 4, วารสารสาระคาม
Kaleidoscope patterns : art education in an elementary classroom
Creators: name: Costello, Eleanor Dale
Publisher: name: University of British Columbia
Year: 2010

description: In September 1985, a new Fine Arts Curriculum Guide/Resource Book was introduced in elementary schools throughout British Columbia. The purpose of this study was to investigate a practitioner's use of the guide within her classroom. Enquiry into the quality of the practitioner's living within the tensionality between this curriculum-as-plan and her curriculum-as-lived experience provided a counterpoint for the researcher's personal reflections on her experiences as a school art specialist and district resource person. An art education evaluation model based on art criticism concepts provided a flexible framework for this study. Classroom observations and reflective dialogue between teacher and researcher raised these issues: the lack of integration and balance between artistic, linguistic, and mathematical modes of learning within the overall school curriculum; the nature of school art, child art and art appreciation as each relates to curriculum goals for art education; evaluation in art education; and the "being" of children and the "being" of women teachers within present educational institutions. The study generated reflections on possible changes in the roles of learners, teachers, art specialists, and educational researchers as they adapt to curriculum change.
CBM3-tagged N-acetylglucosamine oxidase: An Eco-friendly approach for hydrogen peroxide generation in cotton textile manufacturing
Creators: name: Dimitri, Ivan
name: Fredes, Yerko
name: Santema, Lars
name: Alvaro, gREGORIO
name: Romero, Oscar
name: Fraaije, Marco
name: Guillén, Marina
Publisher: name: Zenodo
Year: 2024

description: The growing demand for better biocatalytic processes requires enhancing enzyme reusability and robustness. Innovations inenzyme immobilization explore new supports and methods for easier recovery while improving stability and activity, boostingenzyme efficiency, and reducing downstream costs significantly. The present work evaluates the use of carbohydrate bindingmodules (CBMs), a new technology based on biomolecular scaffolds, as a potential tool for the immobilization of enzymes,such as N-acetylglucasamine oxidase (NagOX), in cellulose-rich materials of biological origin and low value
On the Inhibition of Linear Absorption in Opaque Materials Using Phase-Locked Harmonic Generation
Creators: name: Centini, Marco
name: Roppo, Vito
name: Fazio, Eugenio
name: Pettazzi, Federico
name: Sibilia, Concita
name: Haus, Joseph W.
name: Foreman, John V.
name: Akozbek, Neset
name: Bloemer, Mark J.
name: Scalora, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically predict and experimentally demonstrate inhibition of linear absorption for phase and group velocity mismatched second and third harmonic generation in strongly absorbing materials, GaAs in particular, at frequencies above the absorption edge. A 100-fs pump pulse tuned to 1300nm generates 650nm and 435nm second and third harmonic pulses that propagate across a 450 micron-thick GaAs substrate without being absorbed. We attribute this to a phase-locking mechanism that causes the pump to trap the harmonics and to impress them with its dispersive properties.
Crystal-field excitations and vibronic modes in triangular-lattice spin-liquid candidate TbInO$_3$
Creators: name: Ye, Mai
name: Xu, Xianghan
name: Wang, Xiangyue
name: Kim, Jaewook
name: Cheong, Sang-Wook
name: Blumberg, Girsh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the ground state properties, the electronic excitations and lattice dynamics in spin-liquid candidate TbInO$_3$. By employing polarization resolved Raman spectroscopy we define the inter- and intra-multiplet excitations, and establish the low-energy crystal-field (CF) level scheme. In particular, we demonstrate that the ground state of the Tb$^{3+}$ ions is a non-Kramers doublet, and relate the enhanced linewidth of the CF modes to the magnetic fluctuations near the spin-liquid ground state. We identify all 38 allowed Raman-active phonon modes at low temperature. Moreover, we observe hybrid vibronic excitations involving coupled CF and low-lying phonon modes, suggesting strong spin-lattice dynamics. We develop a model for vibronic states and obtain the parameters of the bare responses and coupling strength. We further demonstrate that the obtained CF level scheme is consistent with specific heat data.
การจัดการเรียนรู้วิชากฎหมายในชีวิตประจำวันของมหาวิทยาลัยมหาสารคามให้มีประสิทธิภาพ
Creators: name: อมรรัตน์ อริยะชัยประดิษฐ์ นิ่มหนู
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2557
Subjects: การเรียนรู้, กฎหมายในชีวิตประจำวัน, ปัญหาการเรียนรู้, แนวทางการแก้ไขปัญหา

description: 1, 5, วารสารสาระคาม
Anomalous heating in a colloidal system
Creators: name: Kumar, Avinash
name: Chetrite, Raphael
name: Bechhoefer, John
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We report anomalous heating in a colloidal system, the first observation of the inverse Mpemba effect, where an initially cold system heats up faster than an identical warm system coupled to the same thermal bath. For an overdamped, Brownian colloidal particle moving in a tilted double-well potential, we find a non-monotonic dependence of the heating times on the initial temperature of the system, as predicted by an eigenfunction expansion of the associated Fokker-Planck equation. By carefully tuning parameters, we also observe a "strong" version of anomalous heating, where a cold system heats up exponentially faster than systems prepared under slightly different conditions
description: 8 pages, 7 figures
MHD simulations of the magnetorotational instability in a shearing box with zero net flux. II. The effect of transport coefficients
Creators: name: Fromang, S.
name: Papaloizou, J.
name: Lesur, G.
name: Heinemann, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the influence of the choice of transport coefficients (viscosity and resistivity) on MHD turbulence driven by the magnetorotational instability (MRI) in accretion disks. We follow the methodology described in paper I: we adopt an unstratified shearing box model and focus on the case where the net vertical magnetic flux threading the box vanishes. For the most part we use the finite difference code ZEUS, including explicit transport coefficients in the calculations. However, we also compare our results with those obtained using other algorithms (NIRVANA, the PENCIL code and a spectral code) to demonstrate both the convergence of our results and their independence of the numerical scheme. We find that small scale dissipation affects the saturated state of MHD turbulence. In agreement with recent similar numerical simulations done in the presence of a net vertical magnetic flux, we find that turbulent activity (measured by the rate of angular momentum transport) is an increasing function of the magnetic Prandtl number Pm for all values of the Reynolds number Re that we investigated. We also found that turbulence disappears when the Prandtl number falls below a critical value Pm_c that is apparently a decreasing function of Re. For the limited region of parameter space that can be probed with current computational resources, we always obtained Pm_c>1. We conclude that the magnitudes of the transport coefficients are important in determining the properties of MHD turbulence in numerical simulations in the shearing box with zero net flux, at least for Reynolds numbers and magnetic Prandtl numbers that are such that transport is not dominated by numerical effects and thus can be probed using current computational resources.
description: 10 pages, 13 figures, accepted in A&A. Numerical results improved, minor changes in the text
Finding a workable holism
Creators: name: Field, John A.
Publisher: name: University of British Columbia
Year: 2010

description: The following thesis examines the need for a holistic learning vehicle. Rather than accept the claims made for left and right hemisphere thinking, an examination is made of holism as defined by respected writers. Culled from their works are ideas of undeniable logic and indisputable claim. These are exposed as the basic components of holism that are likely to receive unquestioned acceptance by the most scientific of educators. It is a holistic perception that the world has to be appreciated for the relationships that give it unity. Only then will life take on meaning beyond the superficial, transient, or short term. Decisions can then be made that consider broad ideas rather than any narrow focus detrimental to the large body, be it a small community or the world. If this is to occur, there must exist a learning system that is capable of conveying the unquestionable holistic principles and ideas to children. Possessed of this, every student will have an appreciation for the unity of his/her world. Once this is understood, the individual will be better able to make judgments and decisions that consider broad needs and views. By so doing s/he will enhance the quality of life for him/herself and others. Upon these tenets are hung the attributes of Dr. Charles Brauner's Concept Gathering System. In Chapter III the earlier selected holistic verities are given a one-to-one relationship with the System to show how it incorporates the credible effects of holism. Subsequent chapters provide an in depth look at the Concept Gathering System. It is first described in detail (chapter IV). Then its function in practice is considered (chapter V). In chapter VI the benefits accruing from such holistic learning are outlined. Here the reader is reminded how the original values of holism are successfully met by the Concept Gathering System. Finally the System's application in the school is reviewed with particular attention given to its suitability to the gifted child, and the advantages offered to it by modern technological equipment. Appendix I is an example of the completed System. Appendix II shows how ideas and summaries can be gathered from a book passsage.
Boundary from bulk integrability in three dimensions: 3D reflection maps from tetrahedron maps
Creators: name: Yoneyama, Akihito
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 17B37, 17B80

description: We established a method for obtaining set-theoretical solutions to the 3D reflection equation by using known ones to the Zamolodchikov tetrahedron equation, where the former equation was proposed by Isaev and Kulish as a boundary analog of the latter. By applying our method to Sergeev's electrical solution and a two-component solution associated with the discrete modified KP equation, we obtain new solutions to the 3D reflection equation. Our approach is closely related to a relation between the transition maps of Lusztig's parametrizations of the totally positive part of $SL_3$ and $SO_5$, which is obtained via folding the Dynkin diagram of $A_3$ into one of $B_2$.
description: 14 pages, 8 figures, v2: updated abstract and minor corrections. For the interactive Figure 6, see the Mathematica notebook obtained from https://www.wolframcloud.com/obj/yoneyama/Published/R20_identity.nb
Jet fragmentation and gauge/string duality
Creators: name: Hatta, Yoshitaka
name: Matsuo, Toshihiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider an analog of e^+e^- annihilation in gauge theories which have a dual string description in asymptotically AdS_5 space and discuss the nature of jet fragmentation. We construct the timelike anomalous dimension which governs the scale dependence of the fragmentation function. In the limit of infinite 't Hooft coupling, the average multiplicity rises linearly with the energy and the inclusive spectrum is peaked at the kinematical boundary.
description: 9 pages, v2:comments and references added
In-Band-Interference Robust Synchronization Algorithm for an NC-OFDM System
Creators: name: Kryszkiewicz, Pawel
name: Bogucka, Hanna
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider receiver synchronization in the non-continguous orthogonal frequency division multiplexing (NC-OFDM)-based radio system in the presence of in-band interfering signal, which occupies the frequency-band between blocks of subcarriers (SCs) used by this system, i.e. in-band of NC-OFDM receiver spectrum range. This paper proposes a novel preamble-based synchronization algorithm for estimation of the time and frequency offset based on the received signal cross-correlation with the reference preamble. Contrary to the existing algorithms, it is robust against in-band interference including narrowband interference at the cost of increased complexity. Moreover, in the interference-free system, the probability of frame synchronization error is improved in comparison to all simulated algorithms.
Channel Coding and Decoding in a Relay System Operated with Physical layer Network Coding
Creators: name: Zhang, Shengli
name: Liew, Soung-Chang
Publisher: name: arXiv
Year: 2008
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Physical-layer Network Coding (PNC) can significantly improve the throughput of wireless two way relay channel (TWRC) by allowing the two end nodes to transmit messages to the relay simultaneously. To achieve reliable communication, channel coding could be applied on top of PNC. This paper investigates link-by-link channel-coded PNC, in which a critical process at the relay is to transform the superimposed channel-coded packets received from the two end nodes plus noise, Y3=X1+X2+W3, to the network-coded combination of the source packets, S1 XOR S2 . This is in distinct to the traditional multiple-access problem, in which the goal is to obtain S1 and S2 separately. The transformation from Y3 to (S1 XOR S2) is referred to as the Channel-decoding-Network-Coding process (CNC) in that it involves both channel decoding and network coding operations. A contribution of this paper is the insight that in designing CNC, we should first (i) channel-decode Y3 to the superimposed source symbols S1+S2 before (ii) transforming S1+S2 to the network-coded packets (S1 XOR S2) . Compared with previously proposed strategies for CNC, this strategy reduces the channel-coding network-coding mismatch. It is not obvious, however, that an efficient decoder for step (i) exists. A second contribution of this paper is to provide an explicit construction of such a decoder based on the use of the Repeat Accumulate (RA) code. Specifically, we redesign the belief propagation algorithm of the RA code for traditional point-to-point channel to suit the need of the PNC multiple-access channel. Simulation results show that our new scheme outperforms the previously proposed schemes significantly in terms of BER without added complexity.
Optical sum rule anomalies in the cuprates: interplay between strong correlation and electronic bandstructures
Creators: name: Toschi, A.
name: Capone, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We theoretically analyze some of the anomalies of the optical sumrules in the high-temperature superconductors. In particular we address the particularly strong dependence on temperature of the sumrule in the normal state. Both electron-electron correlations and the presence of a Van-Hove singularity have been shown to enhance such a dependence. Here we consider both effects simultaneously by means of Dynamical Mean-Field Theory for a two dimensional Hubbard model with realistic parameters for different cuprates, and we find that the two effects are not cooperative, as they appear to compete one another in the region of parameters relevant for the experiments.
description: 8 pages, 6 figures
UV-C Cabinet - Implementation and Workflow Factsheets
Creators: name: Lifebox Foundation
name: Consortium, The N95DECON
Publisher: name: Zenodo
Year: 2021
Subjects: UV
UV-C
N95DECON
Lifebox
Decontamination
N95
mask
ultraviolet
germicidal
irradiation
UVGI

description: Factsheets describing the operating principle and workflow of an ultraviolet-C cabinet constructed for bioburden reduction of N95 respirators, amenable to low-resource settings.
description: {"references": ["https://www.liebertpub.com/doi/full/10.1089/apb.20.0051"]}
It is rotating leaders who build the swarm: social network determinants of growth for healthcare virtual communities of practice
Creators: name: Antonacci, G.
name: Colladon, A. Fronzetti
name: Stefanini, A.
name: Gloor, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computation and Language (cs.CL)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: J.4; I.2.7; H.4.0

description: Purpose: The purpose of this paper is to identify the factors influencing the growth of healthcare virtual communities of practice (VCoPs) through a seven-year longitudinal study conducted using metrics from social-network and semantic analysis. By studying online communication along the three dimensions of social interactions (connectivity, interactivity and language use), the authors aim to provide VCoP managers with valuable insights to improve the success of their communities. Design/methodology/approach: Communications over a period of seven years (April 2008 to April 2015) and between 14,000 members of 16 different healthcare VCoPs coexisting on the same web platform were analysed. Multilevel regression models were used to reveal the main determinants of community growth over time. Independent variables were derived from social network and semantic analysis measures. Findings: Results show that structural and content-based variables predict the growth of the community. Progressively, more people will join a community if its structure is more centralised, leaders are more dynamic (they rotate more) and the language used in the posts is less complex. Research limitations/implications: The available data set included one Web platform and a limited number of control variables. To consolidate the findings of the present study, the experiment should be replicated on other healthcare VCoPs. Originality/value: The study provides useful recommendations for setting up and nurturing the growth of professional communities, considering, at the same time, the interaction patterns among the community members, the dynamic evolution of these interactions and the use of language. New analytical tools are presented, together with the use of innovative interaction metrics, that can significantly influence community growth, such as rotating leadership.
String Cosmological Model in Cylindrically Symmetric Inhomogeneous Universe with Electromagnetic Field II
Creators: name: Pradhan, Anirudh
name: Singh, S. K.
name: Yadav, L. J. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Cylindrically symmetric inhomogeneous string cosmological model of the universe in presence of electromagnetic field is investigated. We have assumed that F_{12} is the only non-vanishing component of electromagnetic field tensor F_{ij}. The Maxwell's equations show that F_{12} is the function of $x$ alone whereas the magnetic permeability is the function of x and t both. To get the deterministic solution, it has been assumed that the expansion ($θ$) in the model is proportional to the eigen value $σ^{1}_{1}$ of the shear tensor $σ^{i}_{j}$. Some physical and geometric prperties of the model are also discussed.
description: 12 pages, no figure. Submitted to Rom. Rep. Phys. arXiv admin note: substantial text overlap with arXiv:0705.0904
Electrostatic solitary waves in the Earth's bow shock: nature, properties, lifetimes and origin
Creators: name: Wang, R.
name: Vasko, I. Y.
name: Mozer, F. S.
name: Bale, S. D.
name: Kuzichev, I. V.
name: Artemyev, A. V.
name: Team, MMS
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We present a statistical analysis of more than two thousand bipolar electrostatic solitary waves (ESW) collected from ten quasi-perpendicular Earth's bow shock crossings by Magnetospheric Multiscale spacecraft. We developed and implemented a correction procedure for reconstruction of actual electric fields, velocities, and other properties of ESW from measurements, whose spatial scales are typically comparable with or smaller than spatial distance between voltage-sensitive probes. We determined the optimal ratio between frequency response factors of axial and spin plane antennas to be around 1.65/1.8. We found that more than 95\% of the ESW in the Earth's bow shock are of negative polarity and present an in depth analysis of properties of these ESW. They have spatial scales of about 10--100 m that is within a range of $λ_{D}$ to $10λ_{D}$, amplitudes typically below a few Volts that is below 0.1 of local electron temperature, and velocities below a few hundreds km/s in spacecraft and plasma rest frames that is on the order of local ion-acoustic speed. The spatial scales of ESW are distinctly correlated with local Debye length $λ_{D}$. ESW with amplitudes of 5--30 V or 0.1--0.3 Te have the occurrence rate of a few percent. The ESW have electric fields generally oblique to local magnetic field and propagate highly oblique to shock normal ${\bf N}$; more than 80\% of ESW propagate within 30$^{\circ}$ of the shock plane. In the shock plane, ESW typically propagate within a few tens of degrees of local magnetic field projection ${\bf B}_{\rm LM}$ onto the shock plane and preferentially opposite to ${\bf N}\times {\bf B}_{\rm LM}$. We argue that the ESW of negative polarity are ion phase space holes produced in a nonlinear stage of ion-ion ion-streaming instabilities. We estimated lifetimes of the ion holes to be 10--100 ms, or 1--10 km in terms of spatial distance.
Center and representations of infinitesimal Hecke algebras of sl_2
Creators: name: Tikaradze, Akaki
name: Khare, Apoorva
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16D90, 16S80

description: In this paper, we compute the center of the infinitesimal Hecke algebras Hz associated to sl_2 ; then using nontriviality of the center, we study representations of these algebras in the framework of the BGG category O. We also discuss central elements in infinitesimal Hecke algebras over gl(n) and sp(2n) for all n. We end by proving an analogue of the theorem of Duflo for Hz.
description: Final form, to appear in "Communications in Algebra"; 35 pages, laTeX
Mean Field Theory for Pedestrian Outflow through an Exit
Creators: name: Yanagisawa, Daichi
name: Nishinari, Katsuhiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: An average pedestrian flow through an exit is one of the most important index in evaluating pedestrian dynamics. In order to study the flow in detail, the floor field model, which is a crowd model by using cellular automaton, is extended by taking into account a realistic behavior of pedestrians around the exit. The model is studied by both numerical simulations and cluster analysis to obtain a theoretical expression of an average pedestrian flow through the exit. It is found quantitatively that the effect of exit door width, a wall, and pedestrian's mood of competition or cooperation significantly influence the average flow. The results show that there is suitable width of the exit and position according to pedestrian's mood.
description: 9 pages, 16 figures
Three-dimensional exotic Newtonian supergravity theory with cosmological constant
Creators: name: Concha, Patrick
name: Ravera, Lucrezia
name: Rodríguez, Evelyn
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a supersymmetric extension of the exotic Newtonian Chern-Simons gravity theory in three spacetime dimensions. The underlying new non-relativistic superalgebra is obtained by expanding the $\mathcal{N}=2$ AdS superalgebra and can be written as two copies of the enhanced Nappi-Witten algebra, one of which is augmented by supersymmetry. We show that the exotic Newtonian superalgebra allows to introduce a cosmological constant to the extended Newtonian supergravity. Interestingly, the obtained supergravity action contains the extended Newton-Hooke supergravity as a sub-case.
description: 25 pages
Magnetic-Field Control of Quantum Critical Points of Valence Transition
Creators: name: Watanabe, Shinji
name: Tsuruta, Atsushi
name: Miyake, Kazumasa
name: Flouquet, Jacques
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the mechanism how critical end points of first-order valence transitions are controlled by a magnetic field. We show that the critical temperature is suppressed to be a quantum critical point (QCP) by a magnetic field and unexpectedly the QCP exhibits nonmonotonic field dependence in the ground-state phase diagram, giving rise to emergence of metamagnetism even in the intermediate valence-crossover regime. The driving force of the field-induced QCP is clarified to be cooperative phenomena of Zeeman effect and Kondo effect, which create a distinct energy scale from the Kondo temperature. This mechanism explains peculiar magnetic response in CeIrIn5 and metamagnetic transition in YbXCu4 for X=In as well as sharp contrast between X=Ag and Cd.
description: 4 pages, 4 figures