cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Non-linear evolution of f(R) cosmologies II: power spectrum
Creators: name: Oyaizu, Hiroaki
name: Lima, Marcos
name: Hu, Wayne
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We carry out a suite of cosmological simulations of modified action f(R) models where cosmic acceleration arises from an alteration of gravity instead of dark energy. These models introduce an extra scalar degree of freedom which enhances the force of gravity below the inverse mass or Compton scale of the scalar. The simulations exhibit the so-called chameleon mechanism, necessary for satisfying local constraints on gravity, where this scale depends on environment, in particular the depth of the local gravitational potential. We find that the chameleon mechanism can substantially suppress the enhancement of power spectrum in the non-linear regime if the background field value is comparable to or smaller than the depth of the gravitational potentials of typical structures. Nonetheless power spectrum enhancements at intermediate scales remain at a measurable level for models even when the expansion history is indistinguishable from a cosmological constant, cold dark matter model. Simple scaling relations that take the linear power spectrum into a non-linear spectrum fail to capture the modifications of f(R) due to the change in collapsed structures, the chameleon mechanism, and the time evolution of the modifications.
description: 9 pages, 6 figures
Supplementary material: A Systematic Literature Review on Reasons and Approaches for Accurate EffortEstimations in Agile
Creators: name: Pasuksmit, Jirat
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 460999
subject: Information systems not elsewhere classified

description: Detail information of the selected studies from "A Systematic Literature Review on Reasons and Approaches for Accurate Effort Estimations in Agile"
The Host Galaxy of GRB 060505: Host ISM Properties
Creators: name: Levesque, Emily M.
name: Kewley, Lisa J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the ISM environment of GRB 060505. Using optical emission-line diagnostic ratios, we compare the ISM properties of the GRB 060505 host region with the hosts of unambiguous long- and short-duration GRBs. We show that the metallicity, ionization state, and star formation rate of the GRB 060505 environment are more consistent with short-duration GRBs than with long-duration GRBs. We compare the metallicity and star formation rates of the GRB 060505 region with four other star-forming regions within the GRB 060505 host galaxy. We find no significant change in metallicity or star formation rate between the GRB 060505 region and the other four host regions. Our results are consistent with a compact-object-merger progenitor for GRB 060505.
description: 7 pages, two figures; accepted for publication in ApJL
The Nature and Geometry of the Light Echo from SN 2006X
Creators: name: Crotts, Arlin
name: Yourdon, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the discovery of the geometry producing the light echo emanating from Supernova 2006X, a nearby but underluminous Type Ia in M100 (= NGC 4321). This offers a rare chance to study the environment of a Type Ia supernova. Contrary to previous reports, there is little evidence of a circumstellar component in the light echo morphology or in the light curve of the unresolved SN point source. Instead, the obvious and dominant echo contribution comes from what is probably a relatively thin sheet of material some 26 pc in front of SN 2006X. Of the four known Type Ia light echoes, three show no evidence of a circumstellar echo and the fourth needs to be confirmed. We consider other evidence for circumstellar material around SN Ia, which may be rare.
description: 17 pages, 2 figures, submitted to Astrophysical Journal Letters
Nonlinear analysis of rigid body-viscous flow interaction
Creators: name: Pareshkumar Gordhandas, Pattani
Publisher: name: University of British Columbia
Year: 2010

description: This thesis decribes the work on extending the finite element method to cover interaction between viscous flow and a moving body. The problem configuration of interest is that of a two-dimensional incompressible flow over a solid body which is elastically supported or alternatively undergoing a specified harmonic oscillation. The problem addressed in this thesis is that of an arbitrarily shaped body undergoing a simple harmonic motion in an otherwise undisturbed fluid. The finite element modelling is based on a velocity-pressure primitive variable representation of the Navier-Stokes equations using curved isoparametric elements with quadratic interpolation for velocities and bilinear for pressure. The problem configuration is represented by a fixed finite element grid but the body moves past the grid. The nonlinear boundary conditions on the moving body are obtained by expanding the relevant body boundary terms to first order in the body amplitude ratio to approximate the velocities at the finite element grid points. The method of averaging is used to analyse the resulting periodic motion of the fluid. The stability of the periodic solutions is studied by introducing small perturbations and applying Floquet theory. Numerical results are obtained for three different body shapes, namely, (1) a square body oscillating parallel to one of its sides, (2) an oscillating circular body and (3) a symmetric Joukowski profile oscillating parallel to the line of symmetry. The latter case is considered to investigate the flow pattern around an asymmetrical body. In all cases, results are obtained for steady streaming, instantaneous velocity vectors in the fluid domain, added mass, added damping, added force and stability of the flow. A comparision is made between the numerical and published experimental steady streamlines. Very good agreement is obtained for the basic nonlinear phenomenon of steady streaming.
Charmless Hadronic B Decays at BaBar
Creators: name: Biesiada, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present recent results on charmless hadronic B decays using data collected by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. We report measurements of branching fractions and charge asymmetries in several charmless two-body, three-body, and quasi-two-body decay modes. We also report measurements of polarization in charmless B decays to exclusive final states with two vector mesons.
description: Proceedings to the Lake Louise Winter Institute 2007
Linking continuum and lattice quark mass functions via an effective charge
Creators: name: Chang, Lei
name: Liu, Yu-Bin
name: Raya, Khépani
name: Rodríguez-Quintero, J.
name: Yang, Yi-Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The quark mass function is computed both by solving the quark propagator Dyson-Schwinger equation and from lattice simulations implementing overlap and Domain-Wall fermion actions for valence and sea quarks, respectively. The results are confronted and seen to produce a very congruent picture, showing a remarkable agreement for the explored range of current-quark masses. The effective running-interaction is based on a process-independent charge rooted on a particular truncation of the Dyson-Schwinger equations in the gauge sector, establishing thus a link from there to the quark sector and inspiring a correlation between the emergence of gluon and hadron masses.
description: 9 pages, 4 figures
TrES-4: A Transiting Hot Jupiter of Very Low Density
Creators: name: Mandushev, Georgi
name: O'Donovan, Francis T.
name: Charbonneau, David
name: Torres, Guillermo
name: Latham, David W.
name: Bakos, Gáspár Á.
name: Dunham, Edward W.
name: Sozzetti, Alessandro
name: Fernández, José M.
name: Esquerdo, Gilbert A.
name: Everett, Mark E.
name: Brown, Timothy M.
name: Rabus, Markus
name: Belmonte, Juan A.
name: Hillenbrand, Lynne A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of TrES-4, a hot Jupiter that transits the star GSC 02620-00648 every 3.55 days. From high-resolution spectroscopy of the star we estimate a stellar effective temperature of Teff = 6100 +/- 150 K, and from high-precision z and B photometry of the transit we constrain the ratio of the semi-major axis and the stellar radius to be a/R = 6.03 +/- 0.13. We compare these values to model stellar isochrones to constrain the stellar mass to be M* = 1.22 +/- 0.17 Msun. Based on this estimate and the photometric time series, we constrain the stellar radius to be R* = 1.738 +/- 0.092 Rsun and the planet radius to be Rp = 1.674 +/- 0.094 RJup. We model our radial-velocity data assuming a circular orbit and find a planetary mass of 0.84 +/- 0.10 MJup. Our radial-velocity observations rule out line-bisector variations that would indicate a specious detection resulting from a blend of an eclipsing binary system. TrES-4 has the largest radius and lowest density of any of the known transiting planets. It presents a challenge to current models of the physical structure of hot Jupiters, and indicates that the diversity of physical properties amongst the members of this class of exoplanets has yet to be fully explored.
Skład ziarnowy łupka miedzionośnego w wyniku rozdrabniania chemicznego
Creators: name: Polesiak, Karolina
name: Kowalczuk, Przemysław B.
Publisher: name: Faculty of Geoengineering, Mining and Geology, Wrocław University of Technology, Wrocław
Year: 2014
Subjects: Łupek, mielenie

description: Łupek miedzionośny, Drzymała J., Kowalczuk P.B. (red.), WGGG PWr, Wrocław, ISBN 978-83-937788-6-7
Dictyothrips betae Uzel 1895
Creators: name: Zhang, Shimeng
name: Wang, Zhaohong
name: Li, Yajin
name: Mound, Laurence
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Thysanoptera
Thripidae
Dictyothrips
Dictyothrips betae

description: Dictyothrips betae Uzel
(Figs 3–4)
Described frOm central EurOpe, and recOrded widely frOm nOrthern Italy tO Denmark and acrOss eastern EurOpe tO Siberia, this species is presumably HOlarctic in distributiOn. It is recOrded here fOr the first time frOm China, in the far nOrth Of this cOuntry. Despite being sO widely recOrded, zur Strassen (2003) indicated that the hOst plant remained unknOwn. HOwever, CiuffO et al. (2010) recOrded this thrips as a vectOr Of a species Of tOspOvirus On twO species Of Polygonum in Italy. Dictyothrips was listed by MasumOtO and Okajima (2017) as a member Of the Anaphothrips grOup, because Of the lack Of lOng setae On the prOnOtum. Within that grOup, it is distinguished because Of the presence Of discal setae On the median sternites, and the presence Of a craspedum On tergites II–VII. The Only member Of the genus is yellOw in cOlOur, with characteristic delicate markings within the sculptured reticles On the bOdy (Fig. 3), tergite IX with nO anteriOr campanifOrm sensilla but shOrt stOut majOr setae (Fig. 4), Ocellar setae III small and clOse tOgether within the Ocellar triangle, and antennal segments III–VI with prOminent rings Of micrOtrichia On bOth surfaces.
New recOrds: China, Inner Mongolia, Chifeng, 2 females frOm unidentified POaceae, 6.vii.2014 (Zhang SM), in NWAFU.
description: Published as part of Zhang, Shimeng, Wang, Zhaohong, Li, Yajin & Mound, Laurence, 2018, One new species, two generic synonyms and eight new records of Thripidae from China (Thysanoptera), pp. 370-378 in Zootaxa 4418 (4) on page 372, DOI: 10.11646/zootaxa.4418.4.3, http://zenodo.org/record/1244922
Roztwarzanie łupka miedzionośnego w kwasach nieorganicznych
Creators: name: Róg, Paweł
name: Drzymała, Jan
Publisher: name: Faculty of Geoengineering, Mining and Geology, Wrocław University of Technology, Wrocław
Year: 2014
Subjects: Łupek, roztwarzanie

description: Łupek miedzionośny, Drzymała J., Kowalczuk P.B. (red.), WGGG PWr, Wrocław, ISBN 978-83-937788-6-7
A Connection Between Bulge Properties and the Bimodality of Galaxies
Creators: name: Drory, Niv
name: Fisher, David B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The global colors of galaxies have recently been shown to follow bimodal distributions. Galaxies separate into a ``red sequence'', populated prototypically by early-type galaxies, and a ``blue cloud'', whose typical objects are late-type disk galaxies. Intermediate-type (Sa-Sbc) galaxies populate both regions. It has been suggested that this bimodality reflects the two-component nature of disk-bulge galaxies. However, it has now been established that there are two types of bulges: ``classical bulges'' that are dynamically hot systems resembling (little) ellipticals, and ``pseudobulges'', dynamically cold, flattened, disk-like structures that could not have formed via violent relaxation. Therefore thee question is whether at types Sa-Sbc, where both bulge types are found, the red-blue dichotomy separates galaxies at some value of disk-to-bulge ratio, $B/T$, or, whether it separates galaxies of different bulge type, irrespective of their $B/T$. We identify classical bulges and pseudobulges morphologically with HST images in a sample of nearby galaxies. Detailed surface photometry reveals that: (1) The red -- blue dichotomy is a function of bulge type: at the same $B/T$, pseudobulges are in globally blue galaxies and classical bulges are in globally red galaxies. (2) Bulge type also predicts where the galaxy lies in other (bimodal) global structural parameters. (3) Hence, the red -- blue dichotomy is not due to decreasing bulge prominence alone, and the bulge type of a galaxy carries significance for the galaxy's evolutionary history ... (Abridged)
description: 10 pages, 4 figures, ApJ in press (August 20, 2007, v665n 2)
Look before you leap: Careful incremental processing of idiosyncratic grammaticalised partial-agreement: ERP and self-paced reading evidence from Arabic
Creators: name: Muralikrishnan, R.
name: Idrissi, Ali
Publisher: name: Zenodo
Year: 2015
Subjects: EEG
Visual ERP study
Self-paced reading
Arabic
Agreement

description: Muralikrishnan & Idrissi (2015). Poster presented at the Annual Meeting of the Society for the Neurobiology of Language, Chicago, USA.
Imperceptible Adversarial Examples by Spatial Chroma-Shift
Creators: name: Aydin, Ayberk
name: Sen, Deniz
name: Karli, Berat Tuna
name: Hanoglu, Oguz
name: Temizel, Alptekin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Deep Neural Networks have been shown to be vulnerable to various kinds of adversarial perturbations. In addition to widely studied additive noise based perturbations, adversarial examples can also be created by applying a per pixel spatial drift on input images. While spatial transformation based adversarial examples look more natural to human observers due to absence of additive noise, they still possess visible distortions caused by spatial transformations. Since the human vision is more sensitive to the distortions in the luminance compared to those in chrominance channels, which is one of the main ideas behind the lossy visual multimedia compression standards, we propose a spatial transformation based perturbation method to create adversarial examples by only modifying the color components of an input image. While having competitive fooling rates on CIFAR-10 and NIPS2017 Adversarial Learning Challenge datasets, examples created with the proposed method have better scores with regards to various perceptual quality metrics. Human visual perception studies validate that the examples are more natural looking and often indistinguishable from their original counterparts.
description: 10 pages, 5 figures. Accepted to International Workshop on Adversarial Learning for Multimedia, ACM Multimedia 2021
Legal opini BUMDes dan Tanah Bengkok
Creators: name: Sari, Amelia Puspita
name: O, Talitha Aisyah
name: Rizal Dwi Novianto
name: W, Fanny Devi
name: Riris Lukitasari
name: Hari Soeskandi S.H., M.H
Publisher: name: Zenodo
Year: 2021
Subjects: BUMDes, Tanah Bengkok

description: Dari beberapa permasalahan desa yang ada, sebagai kelompok mahasiswa hukum kami bukan hanya di tuntut untuk mencari ilmu namun juga mengamalkannya. Adanya KKN Patriot Mengabdi membuat kami belajar mengamalkan apa yang kami dapat selama belajar di Universitas 17 Agustus 1945 Surabaya. Kami memberikan solusi yang di dasarkan pada undang undang terkait dengan permasalahan yang ada. Legal opini ini merupakan salah satu bentuk usaha yang bisa kami berikan, mohon maaf apabila masih banyak kekurangan dalam penulisan legal opini tersebut
Quantum criticality in dimerised anisotropic spin-1 chains
Creators: name: Ejima, Satoshi
name: Lange, Florian
name: Fehske, Holger
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Applying the (infinite) density-matrix renormalisation group technique, we explore the effect of an explicit dimerisation on the ground-state phase diagram of the spin-1 $XXZ$ chain with single-ion anisotropy $D$. We demonstrate that the Haldane phase between large-$D$ and antiferromagnetic phases survives up to a critical dimerisation only. As a further new characteristic the dimerisation induces a direct continuous Ising quantum phase transition between the large-$D$ and antiferromagnetic phases with central charge $c=1/2$, which terminates at a critical end-point where $c=7/10$. Calculating the critical exponents of the order parameter, neutral gap and spin-spin-correlation function, we find $β=1/8$ (1/24), $ν=1$ (5/9), and $η=1/4$ (3/20), respectively, which proves the Ising (tricritical Ising) universality class in accordance with field-theoretical predictions.
description: 5 pages, 4 figures
Miscibility regimes in a $^{23}$Na-$^{39}$K quantum mixture
Creators: name: Gutierrez, Emmanuel M.
name: de Oliveira, Gustavo A.
name: Farias, Kilvia M.
name: Bagnato, Vanderlei S.
name: Castilho, Patricia C. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Effects of miscibility in interacting two-component classical fluids are relevant in a broad range of daily applications. When considering quantum systems, two-component Bose-Einstein condensates provides a well controlled platform where the miscible-immiscible phase transition can be completely characterized. In homogeneous systems, this phase transition is governed only by the competition between intra- and inter-species interactions. However in more conventional experiments dealing with trapped gases, the pressure of the confinement increases the role of the kinetic energy and makes the system more miscible. In the most general case, the miscibility phase diagram of unbalanced mixtures of different atomic species is strongly modified by the atom number ratio and the different gravitational sags. Here, we numerically investigate the ground-state of a $^{23}$Na-$^{39}$K quantum mixture for different interaction strengths and atom number ratios considering realistic experimental parameters. Defining the spatial overlap between the resulting atomic clouds, we construct the phase diagram of the miscibility transition which could be directly measured in real experiments.
description: 18 pages, 6 figures
Describing viable technicolor scenarios
Creators: name: Hirn, Johannes
name: Martin, Adam
name: Sanz, Veronica
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct an effective lagrangian for new strong interactions at the LHC, including as a first step the two lightest triplets of spin-1 resonances. Our parametrization is general enough to allow for previously unstudied spectrum and couplings. Among available frameworks to describe the spin-1 sector, we rely on an extra-dimensional description. Our approach limits the number of parameters, yet is versatile enough to describe the phenomenology of a wide range of new scenarios of strong electroweak symmetry breaking.
description: 15 figures
Suppl. Material.docx
Creators: name: Azevedo, Rafael
Publisher: name: figshare
Year: 2021
Subjects: subject: 110602 Exercise Physiology
subject: FOS: Health sciences
subject: 110999 Neurosciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111603 Systems Physiology
subject: FOS: Basic medicine

description: EMG responses in raw values for each condition.
Rest-Frame Ultraviolet to Near Infrared Observations of an Interacting Lyman Break Galaxy at z = 4.42
Creators: name: Younger, Joshua D.
name: Huang, Jia-Sheng
name: Fazio, Giovanni G.
name: Cox, Thomas J.
name: Lai, Kamson
name: Hopkins, Philip F.
name: Hernquist, Lars
name: Papovich, Casey J.
name: Simard, Luc
name: Lin, Lihwai
name: Cheng, Yi-Wen
name: Yan, Haojin
name: Keres, Dusan
name: Shapley, Alice E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the rest-frame ultraviolet through near infrared spectral energy distribution for an interacting Lyman break galaxy at a redshift z=4.42, the highest redshift merging system known with clearly resolved tidal features. The two objects in this system - HDF-G4 and its previously unidentified companion - are both B_{435} band dropouts, have similar V_{606}-i_{775} and i_{775}-z_{850} colors, and are separated by 1", which at z=4.42 corresponds to 7 kpc projected nuclear separation; all indicative of an interacting system. Fits to stellar population models indicate a stellar mass of M_\star = 2.6\times 10^{10} M_\odot, age of τ_\star = 720 My, and exponential star formation history with an e-folding time τ_0 = 440 My. Using these derived stellar populations as constraints, we model the HDF-G4 system using hydrodynamical simulations, and find that it will likely evolve into a quasar by z\sim3.5, and a quiescent, compact spheroid by z\sim 2.5 similar to those observed at z > 2. And, the existence of such an object supports galaxy formation models in which major mergers drive the high redshift buildup of spheroids and black holes.
description: 7 pages, 7 figures, accepted for publication in ApJ
O'ZBEKISTONDA BUDJET TASHKILOTLARIDA BUDJET MABLAG'LARI BO'YICHA DEBITOR VA KREDITORLAR BILAN HISOBLASHUVLAR HISOBI VA NAZORATINI TAKOMILLASHTIRISH
Creators: name: KURBANOV, ALISHER
Publisher: name: Zenodo
Year: 2024

description: Mamlakat iqtisodiyoti rivojlanishida davlat byudjeti muhim rol o‘ynaydi. Byudjet mablag‘larining samarali boshqarilishi davlatning ijtimoiy-iqtisodiy siyosatini amalga oshirishda hal qiluvchi omil bo‘lib xizmat qiladi. O‘zbekiston kontekstida, byudjet mablag‘larini boshqarish jarayonida davlat tashkilotlari tomonidan kreditor va debitor qarzlarining hisob-kitobi va nazorati eng dolzarb masalalardan biridir.
A Grateful Dead Analysis: The Relationship Between Concert and Listening Behavior
Creators: name: Rodriguez, Marko A.
name: Gintautas, Vadas
name: Pepe, Alberto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computers and Society (cs.CY)
subject: General Literature (cs.GL)
subject: FOS: Computer and information sciences
subject: K.4.0

description: The Grateful Dead were an American band that was born out of the San Francisco, California psychedelic movement of the 1960s. The band played music together from 1965 to 1995 and is well known for concert performances containing extended improvisations and long and unique set lists. This article presents a comparative analysis between 1,590 of the Grateful Dead's concert set lists from 1972 to 1995 and 2,616,990 last.fm Grateful Dead listening events from August 2005 to October 2007. While there is a strong correlation between how songs were played in concert and how they are listened to by last.fm members, the outlying songs in this trend identify interesting aspects of the band and their fans 10 years after the band's dissolution.
Wavefront error correction and Earth-like planet detection by Self-Coherent Camera in space
Creators: name: Galicher, R.
name: Baudoz, P.
name: Rousset, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the context of exoplanet detection, the performance of coronagraphs is limited by wavefront errors. To efficiently correct for these aberrations with a deformable mirror, it is mandatory to measure them using the science detector with a very high accuracy. The Self-Coherent Camera which is based on light incoherence between star and its environment enables an estimation of these wavefront errors. That estimation is directly derived from the encoded speckles in the science image. This avoids differential errors due to beam separation and non common optics. Earth-like planet detection is demonstrated by numerical simulations under realistic assumptions for a space telescope. The Self-Coherent Camera is an attractive technique for future space telescopes. It is also one of the techniques under investigation for the E-ELT planet finder so-called EPICS.
description: 4 pages, 4 eps figures, accepted in A&A the 6th of July 2008
Suppl. Material.docx
Creators: name: Azevedo, Rafael
Publisher: name: figshare
Year: 2021
Subjects: subject: 110602 Exercise Physiology
subject: FOS: Health sciences
subject: 110999 Neurosciences not elsewhere classified
subject: FOS: Clinical medicine
subject: 111603 Systems Physiology
subject: FOS: Basic medicine

description: EMG and NMF responses in raw values for each condition.
Qubit metrology and decoherence
Creators: name: Shaji, Anil
name: Caves, Carlton M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum properties of the probes used to estimate a classical parameter can be used to attain accuracies that beat the standard quantum limit. When qubits are used to construct a quantum probe, it is known that initializing $n$ qubits in an entangled "cat state," rather than in a separable state, can improve the measurement uncertainty by a factor of $1/\sqrt{n}$. We investigate how the measurement uncertainty is affected when the individual qubits in a probe are subjected to decoherence. In the face of such decoherence, we regard the rate $R$ at which qubits can be generated and the total duration $τ$ of a measurement as fixed resources, and we determine the optimal use of entanglement among the qubits and the resulting optimal measurement uncertainty as functions of $R$ and $τ$.
description: 24 Pages, 3 Figures
Towards Equity and Algorithmic Fairness in Student Grade Prediction
Creators: name: Jiang, Weijie
name: Pardos, Zachary A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Equity of educational outcome and fairness of AI with respect to race have been topics of increasing importance in education. In this work, we address both with empirical evaluations of grade prediction in higher education, an important task to improve curriculum design, plan interventions for academic support, and offer course guidance to students. With fairness as the aim, we trial several strategies for both label and instance balancing to attempt to minimize differences in algorithm performance with respect to race. We find that an adversarial learning approach, combined with grade label balancing, achieved by far the fairest results. With equity of educational outcome as the aim, we trial strategies for boosting predictive performance on historically underserved groups and find success in sampling those groups in inverse proportion to their historic outcomes. With AI-infused technology supports increasingly prevalent on campuses, our methodologies fill a need for frameworks to consider performance trade-offs with respect to sensitive student attributes and allow institutions to instrument their AI resources in ways that are attentive to equity and fairness.
description: Accepted to the 2021 AAAI/ACM Conference on AI, Ethics, and Society (AIES '21)
Multiple classifier systems for network security from data collection to attack detection
Creators: name: Mazzariello, Claudio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: Since the Internet started developing, hosts and provided services have always been targeted with attacks trying to disrupt them. Trends show that, throughout the years, the number of hosts, as well as the degree of dependency
of the whole society on the services provided through the Internet, increased dramatically, whereas the skills and knowledge required to interfere with normal network operation, and eventually to abruptly interrupt it,
decreased accordingly. This considerations urge the requirement for effective tools, aimed at granting security to Internet users. The need for systems capable of detecting
attacks, and reacting in order to prevent them from occurring again, is nowadays undeniable.
In this thesis we propose methods based on multiple classifier systems for intrusion detection. We use such systems for automated data collection, also taking privacy issues into account. Some approaches to traffic classification are presented too, together with a proposal for the practical deployment of multiple classifiers in a real network environment.
Atomic Collapse and Quasi-Rydberg States in Graphene
Creators: name: Shytov, A. V.
name: Katsnelson, M. I.
name: Levitov, L. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Charge impurities in graphene can host an infinite family of Rydberg-like resonance states of massless Dirac particles. These states, appearing for supercritical charge, are described by Bohr-Sommerfeld quantization of collapsing classical trajectories that descend on point charge, in analogy to Rydberg states relation with planetary orbits. We argue that divalent and trivalent charge impurities in graphene is an ideal system for realization of this atomic collapse regime. Strong coupling of these states to the Dirac continuum via Klein tunneling leads to striking resonance effects with direct signatures in transport, local properties and enhancement of the Kondo effect.
description: 5 pages, 4 figures
Thermal radio absorption as a tracer of the interaction of SNRs with their environments
Creators: name: Castelletti, G.
name: Supan, L.
name: Peters, W. M.
name: Kassim, N. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present new images and continuum spectral analysis for 14 resolved Galactic SNRs selected from the 74 MHz Very Large Array Low-Frequency Sky Survey Redux (VLSSr). We combine new integrated measurements from the VLSSr with flux densities extracted from the GLEAM and measurements from the literature to generate improved continuum spectra. We combine the VLSSr images with publicly available images at 1.4 GHz, to analyse the resolved morphology and spectral index distribution across each SNR. Three of the SNRs, Kepler, G28.6-0.1, and Tycho, have integrated spectra which can be adequately fit with simple power laws. The resolved spectral index map for Tycho confirms internal absorption which was previously detected by the LOFAR, but it is insufficient to affect the fit to the integrated spectrum. For the pulsar wind nebulae G21.5-0.9 and 3C58 we identify high-frequency spectral breaks at 38 and 12 GHz, respectively. A low frequency spectral turnover adequately fits the data of the remaining nine SNRs. For Kes 67, Kes 69, Kes75, and 3C397, we attribute the absorption to ionised gas along the line of sight, possibly from extended HII region envelopes. For W41 the absorption can be attributed to HII regions located in its immediate proximity. Thermal absorption from interactions at the ionised interface between SNR forward shocks and the surrounding medium were previously identified as responsible for the low frequency turnover in SNR 3C391; our integrated spectrum is consistent with the previous results. We present evidence for the same phenomenon in three additional SNRs, Kes73, W49B, and 3C396, and derive constraints on the physical properties of the interaction. This result indicates that interactions between SNRs and their environs should be readily detectable through thermal absorption by future low frequency observations of SNRs with improved sensitivity and resolution.
description: Accepted for publication in Astronomy and Astrophysics (on August 14th 2021), 29 pages, 8 figures (the quality of the figures has been degraded), 17 tables
Marine log supply : a transport engineering analysis
Creators: name: Kahkeshan, Siavoche
Publisher: name: University of British Columbia
Year: 2010

description: This thesis investigates the marine transport-inventory system of Coastal British Columbia. The intrinsic characteristics of marine log transportation in this region are the vulnerability of marine transportation to adverse weather conditions and the presence of time-related economic costs. The system is confined to the Powell River operation. Three origins, one storage area and three pulp log types are considered. The formulated problem is classified as a sequential decision-making process. A deterministic model using the network flow theory and a simulation model using GPSS are developed. Due to considerable uncertainty in the system operation, the computer simulation model is selected. The model includes all of the important system variables and their interactions and assesses alternative operational doctrines by calculating variation in a key aspect of system performance, total logistic cost. It is found that: 1) the use of barges as the transportation mode leads to the least logistic cost, 2) the second best transportation alternative is the direct shipment of logs from origins to the mill and 3) if higher value saw log is considered, the log-taxi alternative may become attractive. However, to improve the capability of the developed model, more information on the salt contamination and teredo damage and accurate estimation of cost consequences of a mill shutdown are required. Future works should focus on these areas.
Quantum bistability and spin current shot noise of a single quantum dot coupled to an optical microcavity
Creators: name: Djuric, Ivana
name: Zivkovic, Marko
name: Search, Chris P.
name: Recine, Greg
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Here we explore spin dependent quantum transport through a single quantum dot coupled to an optical microcavity. The spin current is generated by electron tunneling between a single doped reservoir and the dot combined with intradot spin flip transitions induced by a quantized cavity mode. In the limit of strong Coulomb blockade, this model is analogous to the Jaynes-Cummings model in quantum optics and generates a pure spin current in the absence of any charge current. Earlier research has shown that in the classical limit where a large number of such dots interact with the cavity field, the spin current exhibits bistability as a function of the laser amplitude that drives the cavity. We show that in the limit of a single quantum dot this bistability continues to be present in the intracavity photon statistics. Signatures of the bistable photon statistics manifest themselves in the frequency dependent shot noise of the spin current despite the fact that the quantum mechanical average spin current no longer exhibits bistability. Besides having significance for future quantum dot based optoelectronic devices, our results shed light on the relation between bistability, which is traditionally viewed as a classical effect, and quantum mechanics.
Properties of the accretion ring in an X-ray binary, and accretion and excretion two-layer flows from it
Creators: name: Inoue, Hajime
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study properties of an accretion ring in a steady mass flow from a companion star to a compact object in an X-ray binary. The accretion ring is a place where matter inflowing from a companion star sojourns for a while to bifurcate to accretion and excretion flows due to angular momentum transfer in it. The matter in the accretion ring rotates along the Keplerian circular orbit determined by the intrinsic specific angular momentum of the inflowing matter and forms a thick ring-envelope. Two internal flows are expected to appear in the thick envelope. One is a mass spreading flow bifurcating to a thick accretion flow and a thick excretion flow, as a result of the angular momentum transfer within the ring-envelope. The other is a cooling flow toward the envelope center governed by radiative cooling under an effect of X-ray irradiation. This cooling flow eventually forms a core in the torus, from which a thin accretion disk and a thin excretion disk spread out as a result of the angular momentum transfer there again. Evaluating and comparing the time scales for the two internal flows, the accretion ring is shown to generally originate a two-layer accretion flow in which a thin accretion disk is sandwiched by a thick accretion flow, unless the accretion rate is very low. Properties of the thin excretion disk and the thick excretion flow are also investigated. The thin excretion disk is expected to terminate at a distance 4 times as large as the accretion ring radius and to form another ring there, unless tidal effects from the companion star exist. The thick excretion flow is, on the other hand, likely to turn to a super-sonic wind-flow reaching the infinity.
Interactive nonlinear analysis of wind-loaded pneumatic membrane structures
Creators: name: Han, Peng Siew
Publisher: name: University of British Columbia
Year: 2010

description: A nonlinear analysis of pneumatic membrane structures loaded by wind, taking into account the fluid-structure interactions, is presented here. The analysis comprises two parts: the flow part which is solved using a boundary element procedure and the structures part which is analysed with a finite element approach. These two numerical techniques are then coupled to capture the effects of the fluid-structure interaction in the analysis. The wind is represented by potential flow and thus Laplace's equation governs. The boundary element method employed in the analysis, features moving singularities of the fundamental solutions. The singularities are placed on an auxiliary boundary located outside the domain of interest. Results from solved examples show the technique to be highly accurate for the computation of wind loads. The method is however, nonlinear with the nonlinearity occuring in the determination of the auxiliary boundary. The membrane, assumed to be perfectly flexible and to exhibit only exten-sional rigidity, is modeled by a small strain-finite deformation theory. A Galerkin finite element approach is formulated for the analysis of two-dimensional pneumatic membrane structures. The analysis is based on an infinitely long cylindrical membrane with an initially circular cross-section. For three-dimensional pneumatic membrane structures, the analysis is accomplished with a continuum mechanics-based incremental finite element formulation using a convected coordinate description. The metric tensor for any deformed configuration is derived and from this, a consistent measure of deformation is obtained. In both analyses, the governing finite element equations are solved via Newton-Raphson iteration with an 'automatic' line-search scheme. A pertubation technique is developed to check the accuracy of the proposed two-dimensional finite element analysis for low wind speeds. At higher wind speeds, comparison with available solutions are made. To assess the performance of the proposed three-dimensional finite element analysis, a square membrane and a cylindrical membrane are analysed. Good agreement with published results is observed. Having established the accuracies of the boundary element and the finite element methods on independent flow and structures problems respectively, interactive analysis is then carried out. Two pneumatic membrane structures are analysed: an infinitely long cylindrical membrane as a two-dimensional example, and the air-supported roof of the BC Place Stadium as a three-dimensional example.
Thirty years of TEFLIN Journal: A bibliometric portrait through the lens of Microsoft Academic
Creators: name: Syahid, Abdul
name: Mukminatien, Nur
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: Bibliometric studies are a rare undertaking in the field of English language teaching, especially at a journal level. To celebrate the 30th anniversary of TEFLIN Journal, this study exhibits a bibliometric portrait of its publication, indexation, and citation from 1990 to 2019. Two pieces of free software were adopted to conduct the descriptive and network analyses of bibliographic data from Microsoft Academic. The publication and citation metrics have risen during its lifetime. The bibliographic network identifies the most productive authors, institutions, and countries along with the co-authorship pattern, type of top-cited articles, and top-used keywords. The articles relatedness is also sighted in terms of the citation frequency and number of shared references. Even though the analyses were complicated by some missing articles and improper indexation, this study could still take a full-length bibliometric portrait of the journal during its 30-year journey between the commitment to competence and the quest for higher impact.
Classical Artificial Neural Network Training Using Quantum Walks as a Search Procedure
Creators: name: de Souza, Luciano S.
name: de Carvalho, Jonathan H. A.
name: Ferreira, Tiago A. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper proposes a computational procedure that applies a quantum algorithm to train classical artificial neural networks. The goal of the procedure is to apply quantum walk as a search algorithm in a complete graph to find all synaptic weights of a classical artificial neural network. Each vertex of this complete graph represents a possible synaptic weight set in the $w$-dimensional search space, where $w$ is the number of weights of the neural network. To know the number of iterations required \textit{a priori} to obtain the solutions is one of the main advantages of the procedure. Another advantage is that the proposed method does not stagnate in local minimums. Thus, it is possible to use the quantum walk search procedure as an alternative to the backpropagation algorithm. The proposed method was employed for a $XOR$ problem to prove the proposed concept. To solve this problem, the proposed method trained a classical artificial neural network with nine weights. However, the procedure can find solutions for any number of dimensions. The results achieved demonstrate the viability of the proposal, contributing to machine learning and quantum computing researches.
description: 19 pages, 7 figures
A separable non-remainder of H
Creators: name: Dow, Alan
name: Hart, Klaas Pieter
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Topology (math.GN)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 54F15, 03E50, 03E65, 54A35, 54D15, 54D40, 54D65

description: We prove that there is a compact separable continuum that (consistently) is not a remainder of the real line.
description: Rewrite after referee's comments
Crystallization behaviors in superionic conductor Na$_3$PS$_4$
Creators: name: Nakajima, Hiroshi
name: Tsukasaki, Hirofumi
name: Ding, Jiong
name: Kimura, Takuya
name: Nakano, Takumi
name: Nasu, Akira
name: Hirata, Akihiko
name: Sakuda, Atsushi
name: Hayashi, Akitoshi
name: Mori, Shigeo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: All-solid-state batteries using sodium are promising candidates for next-generation rechargeable batteries due to the limited lithium resources. A practical sodium battery requires an electrolyte with high conductivity. Cubic Na$_3$PS$_4$ exhibiting high conductivity of over 10$^{-4}$ S cm$^{-1}$ is obtained by crystallizing amorphous Na$_3$PS$_4$ synthesized by ball milling. Amorphous Na$_3$PS$_4$ crystallizes in a cubic structure and then is transformed into a tetragonal phase upon heating. In this study, in situ observation by transmission electron microscopy demonstrates that the crystallite size drastically increases during the transition from the cubic phase to the tetragonal phase. Moreover, an electron diffraction analysis reveals that amorphous domains and nano-sized crystallites coexist in the cubic Na$_3$PS$_4$ specimen, while the tetragonal phase contains micro-sized crystallites. The nano-sized crystallites and the composite formed by crystallites and amorphous domains are most likely responsible for the increase in conductivity in the cubic Na$_3$PS$_4$ specimens.