cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
First-principles Hubbard U and Hund's J corrected approximate density-functional theory predicts an accurate fundamental gap in rutile and anatase TiO2
Creators: name: Orhan, Okan K.
name: O'Regan, David D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Titanium dioxide (TiO$_2$) presents a long-standing challenge for approximate Kohn-Sham density-functional theory (KS-DFT), as well as to its Hubbard-corrected extension, DFT+$U$. We find that a previously proposed extension of first-principles DFT+$U$ to incorporate a Hund's $J$ correction, termed DFT+$U$+$J$, in combination with parameters calculated using a recently proposed linear-response theory, predicts fundamental band-gaps accurate to well within the experimental uncertainty in rutile and anatase TiO$_2$. Our approach builds upon established findings that Hubbard correction to both titanium $3d$ and oxygen $2p$ subspaces in TiO$_2$, symbolically giving DFT+$U^{d,p}$, is necessary to achieve acceptable band-gaps using DFT+$U$. This requirement remains when the first-principles Hund's $J$ is included. We also find that the calculated gap depends on the correlated subspace definition even when using subspace-specific first-principles $U$ and $J$ parameters. Using the simplest reasonable correlated subspace definition and underlying functional, the local density approximation, we show that high accuracy results from using a relatively uncomplicated form of the DFT+$U$+$J$ functional. For closed-shell systems such as TiO$_2$, we describe how various DFT+$U$+$J$ functionals reduce to DFT+$U$ with suitably modified parameters, so that reliable band gaps can be calculated for rutile and anatase with no modifications to a conventional DFT+$U$ code.
description: 13 pages, 3 figures, 5 tables + Supporting Information
Racial and Ethnic Differences in Health Care Experiences for Veterans Receiving VA Community Care from 2016 to 2021
Creators: name: Thorpe, Carolyn T.
name: Vanneman, Megan E.
name: Suda, Katie
name: Radomski, Thomas
name: Krishnamurthy, Sudarshan
name: Mor, Maria
name: Roberts, Eric T.
name: Sileanu, Florentina
name: Li, Yaming
name: Fine, Michael J.
name: Essien, Utibe R.
name: Gellad, Walid F.
Publisher: name: Springer Nature
Year: 2024

description:
Background Prior research documented racial and ethnic disparities in health care experiences within the Veterans Health Administration (VA). Little is known about such differences in VA-funded community care programs, through which a growing number of Veterans receive health care. Community care is available to Veterans when care is not available through the VA, nearby, or in a timely manner. Objective To examine differences in Veterans’ experiences with VA-funded community care by race and ethnicity and assess changes in these experiences from 2016 to 2021. Design Observational analyses of Veterans’ ratings of community care experiences by self-reported race and ethnicity. We used linear and logistic regressions to estimate racial and ethnic differences in community care experiences, sequentially adjusting for demographic, health, insurance, and socioeconomic factors. Participants Respondents to the 2016–2021 VA Survey of Healthcare Experiences of Patients-Community Care Survey.MeasuresCare ratings in nine domains.Key ResultsThe sample of 231,869 respondents included 24,306 Black Veterans (mean [SD] age 56.5 [12.9] years, 77.5% male) and 16,490 Hispanic Veterans (mean [SD] age 54.6 [15.9] years, 85.3% male). In adjusted analyses pooled across study years, Black and Hispanic Veterans reported significantly lower ratings than their White and non-Hispanic counterparts in five of nine domains (overall rating of community providers, scheduling a recent appointment, provider communication, non-appointment access, and billing), with adjusted differences ranging from − 0.04 to − 0.13 standard deviations (SDs) of domain scores. Black and Hispanic Veterans reported higher ratings with eligibility determination and scheduling initial appointments than their White and non-Hispanic counterparts, and Black Veterans reported higher ratings of care coordination, with adjusted differences of 0.05 to 0.21 SDs. Care ratings improved from 2016 to 2021, but differences between racial and ethnic groups persisted. Conclusions This study identified small but persistent racial and ethnic differences in Veterans’ experiences with VA-funded community care, with Black and Hispanic Veterans reporting lower ratings in five domains and, respectively, higher ratings in three and two domains. Interventions to improve Black and Hispanic Veterans’ patient experience could advance equity in VA community care.
Remuneration Difference between Migrant Workers and Non-migrant Workers
Creators: name: DUAN Changlin
name: LUO Huawei
name: DUAN Changlin
name: LUO Huawei
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Migrant workers, Non-migrant workers, Remuneration

description: Through the survey of direct economic remuneration, indirect economic remuneration and non-economic remuneration of employees in flat panel furniture enterprises in Chengdu City, we conduct a comparative analysis of the problems and causes of remuneration difference between migrant workers and non-migrant workers. The results show that the wage difference between migrant workers and non-migrant workers is the biggest, and there is little difference in terms of interests safeguarding and non-economic factors. The reason for the above results lies in the difference of education level; gender, region, household registration and other issues have little impact on the above results. The following recommendations are put forward to improve the remuneration of migrant workers: increasing government's policy advocacy efforts and eliminating subjective offense; establishing the administrative oversight bodies and effectively safeguarding the legitimate rights and interests of migrant workers; strengthening vocational training for migrant workers, so that workers have more choices on positions; improving the working environment and developing good working atmosphere.
An investigation into triple bottom line value of Pavegen tiles : installation at UBC
Creators: name: Crockett, Shawn
name: Fleming, Lukas
name: Kim, Saeromi
Publisher: name: The University of British Columbia
Year: 2012

description: It has been proposed to install eight Pavegen tiles in the new Student Union Building (SUB) at UBC. Each tile produces 3J of energy when stepped on and the combined purchase, shipping, and installation cost of eight tiles is $30 800 minimum. The main goal of the proponent is to use the tiles as a tool to increase students’ awareness of sustainability. The energy produced would help to power display screens used for way-finding and for displaying sustainability related information. To determine if this project should be done, a triple bottom line investigation has been performed that considers economic, environmental, and social indicators. Economic indicators found the net present value to be -$30 244.27, the internal rate of return to be -66.18% and the payback period to be 303 149 years. Environmental indicators found that the energy required to produce and to ship the device to be 142.88MJ while it would only generate 6MJ over its lifetime. Needless to say the economic and environmental analysis both show significant loss. Moreover, the device cannot be called “sustainable” because it produces net negative energy over its cradle-to-grave life. The social indicators show the potential to reach 40 000 students over the life of the device which can be either very positive or very negative depending on people’s reaction. Unfortunately anyone who discovers the economic and especially the environmental indicators, will likely develop a negative reaction. Hence, it is not recommended to purchase the Pavegen tiles. Both primary and secondary research was performed. Secondary research included books, internet sources, Pavegen customer information sheets, and AMS information sheets. Primary research included a student survey and a faculty survey. Many details about the product were not available due to intellectual property limitations and so numerous assumptions and estimates were made. A sensitivity analysis was performed where possible to asses the effect of variations in the assumptions. It was determined that the overall conclusion would not be affected by such variations. Assumptions made included: no maintenance costs, all tiles reach their full lifetime, constant inflation rate of 2%, quantity of the materials used in fabrication, and that only 30% of students use the stairs in the SUB. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Global Majority E-Journal, vol. 08, no. 1, June 2017
Creators: name: Pendino, Cassandra
name: Kim, Diane
name: Kaplan, Ivy
name: Cameron, Jillian
Publisher: name: American University (Washington, D.C.). Department of Economics
Year: 2023
Subjects: classificationCode: 38
subject: Economics

description: Description to be added
A Study on Ginseng Price Fluctuations in China and South Korea
Creators: name: LIANG Meiling
name: LI Xiangguo
name: HAN Lianhua
name: LIANG Meiling
name: LI Xiangguo
name: HAN Lianhua
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: China and South Korea, Ginseng, Price

description: China and South Korea are the main producers and exporters of ginseng. This paper mainly discusses the characteristics of ginseng price fluctuations in China and South Korea. As people continue to understand the concept of homology of medicine and food, there is still an increasing international demand for ginseng, and the favorable market can be expected.
Non-collinear magnetic structures: a possible cause for current induced switching
Creators: name: Weinberger, P.
name: Vernes, A.
name: Gyorffy, B. L.
name: Szunyogh, L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Current induced switching in Co/Cu/Co trilayers is described in terms of ab-initio determined magnetic twisting energies and corresponding sheet resistances. In viewing the twisting energy as an energy flux the characteristic time thereof is evaluated by means of the Landau-Lifshitz-Gilbert equation using ab-initio parameters. The obtained switching times are in very good agreement with available experimental data. In terms of the calculated currents, scalar quantities since a classical Ohm's law is applied, critical currents needed to switch magnetic configurations from parallel to antiparallel and vice versa can unambiguously be defined. It is found that the magnetoresistance viewed as a function of the current is essentially determined by the twisting energy as a function of the relative angle between the orientations of the magnetization in the magnetic slabs, which in turn can also explain in particular cases the fact that after having switched off the current the system remains in the switched magnetic configuration. For all ab-initio type calculations the fully relativistic Screened Korringa-Kohn-Rostoker method and the corresponding Kubo-Greenwood equation in the context of density functional theory are applied.
description: 20 pages, 4 tables and 15 figures, submitted to PRB
A First Mass Production of Gas Electron Multipliers
Creators: name: Barbeau, P. S.
name: Collar, J. I.
name: Geissinger, J. D.
name: Miyamoto, J.
name: Shipsey, I.
name: Yang, R.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Astrophysics (astro-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Accelerator Physics (physics.acc-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We report on the manufacture of a first batch of approximately 2,000 Gas Electron Multipliers (GEMs) using 3M's fully automated roll to roll flexible circuit production line. This process allows low-cost, reproducible fabrication of a high volume of GEMs of dimensions up to 30$\times$30 cm$^{2}$. First tests indicate that the resulting GEMs have optimal properties as radiation detectors. Production techniques and preliminary measurements of GEM performance are described. This now demonstrated industrial capability should help further establish the prominence of micropattern gas detectors in accelerator based and non-accelerator particle physics, imaging and photodetection.
description: 11 pages, 10 figures, to be submitted to Nucl. Instr. Meth. A
Global Majority E-Journal, vol. 07, no. 1, June 2016
Creators: name: Jakiel, Lara
name: Burdell, Cole
name: Kirpalani, Sarina
name: Pardilla, Ambar
Publisher: name: American University (Washington, D.C.). Department of Economics
Year: 2023
Subjects: classificationCode: 38
subject: Economics

description: Description to be added
Improving Control Effectiveness in IS Development Projects Through Participatory Implementation
Creators: name: Walser, Roman
Publisher: name: figshare
Year: 2020
Subjects: Theoretical Computer Science

description: Abstract: Efficient Information Systems (IS) adequately serving business needs can be seen as an important prerequisite for the survival of most organizations. Newly developing or adopting those systems is a challenging task. To increase probability of success in often complex development projects, managers usually implement controls. However, most controls require support and active commitment of the controllees in order to be effective. To better understand the concept of control legitimacy and resulting control responses, researchers have recently shifted their focus on the controllee perspective. However, the process of choosing and enacting control is still considered top-down. In this poster paper, we propose to move away from this assumption. Instead, project managers should make the process more participatory by involving the controllees already at the beginning of IS development projects. This would help to choose and implement a set of controls which is perceived as legitimate and thus supported by the controllees.
Global Majority E-Journal, vol. 07, no. 2, December 2016
Creators: name: Starks, Claire
name: Francis, Walter
name: Paredes, Isabelle
name: Rapoport, Hannah
Publisher: name: American University (Washington, D.C.). Department of Economics
Year: 2023
Subjects: classificationCode: 38
subject: Economics

description: Description to be added
An investigation into interactive display technologies
Creators: name: Cleveland, Jeremy
name: Wu, Aaron
name: Davies, Alan
Publisher: name: The University of British Columbia
Year: 2012

description: There is interest in putting an interactive display board in the new Student Union Building (SUB) at UBC. This report compares in depth various display and interactivity technologies and their respective benefits and disadvantages. This report also covers the optimal location for such a display board given the technology being used. After ruling out several other technologies, LCD and LED televisions are compared with regards to cost, social consideration, and economic impact. LED TVs are found to be the best choice, as they are cheaper over time and more environmentally friendly. Several interactive kiosk technologies are compared, including keyboards, mice, trackballs, touch screens, Kinect sensors, and voice command. Under a triple-bottom-line assessment, touch screens are found to be the most favourable, as they are more functional than the other options. After considering many factors, the walls at the centre of the atrium on the main floor are the best options for display board placement. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Global Majority E-Journal, vol. 06, no. 2, December 2015
Creators: name: Abd Wahab, Abd Wafiee
name: Bowcutt, Haley
name: Falek, Rachel
name: Kudlac, Kaitie
Publisher: name: American University (Washington, D.C.). Department of Economics
Year: 2023
Subjects: classificationCode: 38
subject: Economics

description: Description to be added
title: Defining HLA-A locus alleles from DNA using ARMS-PCR.
Creators: name: Krausa, Peter
Publisher: name: The Open University
Year: 1997

description: The HLA system is a highly polymorphic group of genes which play a central role in the immune response. The definition of the HLA system makes an important contribution to a number of fields. In the clinical setting it is a requirement for transplantation. For anthropology, the HLA system is a useful marker for assessing population groups. Functionally, it is an important component of the T cell mediated immune response. The definition offered by the established method of serology to HLA class I tissue-typing is restrictive since serology fails to discriminate between alleles which are functionally distinct. This research represents one of the first DNA based approaches and the first by PCR-SSP, to define HLA class I specificities, with particularly reference to the HLA-A locus. This thesis charts both the development and application of a robust, simple to perform, easy to interpret yet highly powerful PCR based system in which allelic definition is demonstrated. In addition to resolution, a DNA approach offers many practical advantages over the restrictive demands of a serological typing. Further more, this thesis examines the functional aspect of polymorphism, in defining the peptide binding preferences of a group of closely related HLA specificities. By so doing, this thesis shows the relevance of a highly definitive approach to HLA typing.
The Major Challenges and Strategies for the Development of Green Economy in China's Mountain Regions Based on the Theory of Comparative Advantage
Creators: name: NIE Wan
name: WANG Luohan
name: NIE Wan
name: WANG Luohan
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: Green economy, Mountain regions, Economic development, Comparative advantage

description: Based on the theory of comparative advantage, this paper analyzes the major challenges facing the development of green economy in China's mountain regions. The results show that in the development of green economy, the mountain regions have factor endowment and development conditions with comparative advantage, but they are also facing more challenges. In the future, the mountain regions need to make favorable development measures based on their own comparative advantages from the following four aspects: at the top design level, it is necessary to ensure green development through institutional innovation; at the regional level, it is necessary to lead green development through the differentiation strategy; at the industrial level, it is necessary to support green development through transformation and innovation; at the social level, it is necessary to focus on protecting vulnerable groups and give full play to the role of women to promote sharing of green development results.
Burst-and-coast swimmers optimize gait by adapting unique intrinsic cycle
Creators: name: Li, G.
name: Ashraf, I.
name: François, B.
name: Kolomenskiy, D.
name: Lechenault, F.
name: Godoy-Diana, R.
name: Thiria, B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: This paper addresses the physical mechanism of intermittent swimming by considering the burst-and-coast regime of fish swimming at different speeds. The burst-and-coast regime consists of a cycle with two successive phases: a phase of active undulation powered by the fish muscles followed by a passive gliding phase. Observations of real fish whose swimming gait is forced in a water flume from low to high speed regimes are performed, using a full description of the fish kinematics and mechanics. We first show that fish modulate a unique intrinsic cycle to sustain the demanded speed by modifying the bursting to coasting ratio while maintaining the duration of the cycle constant. Secondly, we show using numerical simulations that the chosen kinematics correspond to optimized gaits over the range of swimming speeds tested.
description: 7 pages, 3 figures
Interaction of charged impurities and Rydberg excitons in cuprous oxide
Creators: name: Krüger, Sjard Ole
name: Stolz, Heinrich
name: Scheel, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the influence of a static, uncorrelated distribution of charged impurities on the spectrum of bound excitons in the copper oxide Cu$_{\text{2}}$O. We show that the statistical distribution of Stark shifts and ionisation rates leads to the vanishing of Rydberg resonances into an apparent continuum. The appearance of additional absorption lines due to the broken rotational symmetry, together with spatially inhomogeneous Stark shifts, leads to a modification of the observed line shapes that agree qualitatively with the changes observed in the experiment.
description: 6 pages, 4 figures
The Nearby Supernova Factory
Creators: name: Wood-Vasey, W. M.
name: Aldering, G.
name: Lee, B. C.
name: Loken, S.
name: Nugent, P.
name: Perlmutter, S.
name: Siegrist, J.
name: Wang, L.
name: Antilogus, P.
name: Astier, P.
name: Hardin, D.
name: Pain, R.
name: Copin, Y.
name: SMadja, G.
name: Gangler, E.
name: Castera, A.
name: Adam, G.
name: Bacon, R.
name: Lemonnier, J-P.
name: Pecontal, A.
name: Pecontal, E.
name: Kessler, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Nearby Supernova Factory (SNfactory) is an ambitious project to find and study in detail approximately 300 nearby Type Ia supernovae (SNe~Ia) at redshifts 0.03
description: 7 pages, 3 figures to be published in New Astronomy Reviews
PRISMA-P checklist for ‘Effectiveness of non-pharmacological falls prevention interventions for people with Multiple Sclerosis, Parkinson’s Disease and stroke: Protocol for an umbrella review’
Creators: name: O'Malley, Nicola
name: Clifford, Amanda M
name: Comber, Laura
name: Coote, Susan
Publisher: name: figshare
Year: 2020
Subjects: subject: 110317 Physiotherapy
subject: FOS: Clinical medicine
subject: 110321 Rehabilitation and Therapy (excl. Physiotherapy)
subject: 110904 Neurology and Neuromuscular Diseases

description: PRISMA-P checklist for ‘Effectiveness of non-pharmacological falls prevention interventions for people with Multiple Sclerosis, Parkinson’s Disease and stroke: Protocol for an umbrella review’
Directed transport born from chaos in asymmetric antidot structures
Creators: name: Chepelianskii, A. D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: It is shown that a polarized microwave radiation creates directed transport in an asymmetric antidot superlattice in a two dimensional electron gas. A numerical method is developed that allows to establish the dependence of this ratchet effect on several parameters relevant for real experimental studies. It is applied to the concrete case of a semidisk Galton board where the electron dynamics is chaotic in the absence of microwave driving. The obtained results show that high currents can be reached at a relatively low microwave power. This effect opens new possibilities for microwave control of transport in asymmetric superlattices.
description: 8 pages, 10 figures
A Study on the Development of Rural Tourism in Qianshan Scenic Spot in Liaoning Province from the Perspective of Local Theory
Creators: name: YU Yang
name: ZHAO Liang
name: YU Yang
name: ZHAO Liang
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: Rural tourism, Local theory, Liaoning Qianshan

description: This paper first explains the local theoretical knowledge, and then analyzes the local foundation of the development of rural tourism in Qianshan scenic area, and finally puts forward the conception of the development of rural tourism in Qianshan scenic area.
Overcoming the tradeoff between confinement and focal distance using virtual ultrasonic optical waveguides
Creators: name: Scopelliti, Matteo Giuseppe
name: Huang, Hengji
name: Pediredla, Adithya
name: Narasimhan, Srinivasa
name: Gkioulekas, Ioannis
name: Chamanzar, Maysamreza
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Conventional optical lenses have been used to focus light from outside without disturbing the medium. The focused spot size is proportional to the focal distance in a conventional lens, resulting in a tradeoff between depth of penetration in the target medium and spatial resolution. We have shown that virtual ultrasonically sculpted gradient-index (GRIN) optical waveguides can be formed in the target medium to guide and steer light without disturbing the medium. Here, we demonstrate that such virtual waveguides can relay an externally focused beam of light through the medium beyond the focal distance of an external physical lens to extend the penetration depth without compromising the spot size. Moreover, the spot size can be tuned by reconfiguring the virtual waveguide. We show that these virtual GRIN waveguides can be formed in transparent as well as turbid media to enhance the confinement and contrast ratio of the focused beam of light at the target location. This method can be extended to realize complex optical systems of external physical lenses and in situ virtual waveguides to extend the reach and flexibility of optical methods.
description: 11 pages, 6 figures
Simplified Ray Tracing for the Millimeter Wave Channel: A Performance Evaluation
Creators: name: Lecci, Mattia
name: Testolina, Paolo
name: Giordani, Marco
name: Polese, Michele
name: Ropitault, Tanguy
name: Gentile, Camillo
name: Varshney, Neeraj
name: Bodi, Anuraag
name: Zorzi, Michele
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Networking and Internet Architecture (cs.NI)
subject: Performance (cs.PF)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Millimeter-wave (mmWave) communication is one of the cornerstone innovations of fifth-generation (5G) wireless networks, thanks to the massive bandwidth available in these frequency bands. To correctly assess the performance of such systems, however, it is essential to have reliable channel models, based on a deep understanding of the propagation characteristics of the mmWave signal. In this respect, ray tracers can provide high accuracy, at the expense of a significant computational complexity, which limits the scalability of simulations. To address this issue, in this paper we present possible simplifications that can reduce the complexity of ray tracing in the mmWave environment, without significantly affecting the accuracy of the model. We evaluate the effect of such simplifications on link-level metrics, testing different configuration parameters and propagation scenarios.
description: 6 pages, 6 figures, 1 table. This paper has been accepted for presentation at ITA 2020. (c) 2020 IEEE. Please cite it as: M. Lecci, P. Testolina, M. Giordani, M. Polese, T. Ropitault, C. Gentile, N. Varshney, A. Bodi, M. Zorzi, "Simplified Ray Tracing for the Millimeter Wave Channel: A Performance Evaluation," Information Theory and Applications Workshop (ITA), San Diego, US, 2020
Rare B Decays into States Containing a J/psi Meson and a Meson with ssbar Quark Content
Creators: name: BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report a study of the B meson decays, B+ -> J/psi phi K+, B0 -> J/psi phi K0S, B0 -> J/psi phi, B0 -> J/psi eta and B0 -> J/psi eta' using 56 million BBbar events collected at the Y(4S) resonance with the BABAR detector at the PEP-II e+ e- asymmetric-energy storage ring. We measure the branching fractions B(B+ -> J/psi phi K+) = (4.4 +- 1.4(stat) +- 0.5(syst)) * 10-5 and B(B0 -> J/psi phi K0S) = (5.1 +- 1.9(stat) +- 0.5(syst)) * 10^-5, and set upper limits at 90% confidence level for the branching fractions B(B0 -> J/psi phi) < 9.2 * 10^-6, B(B0 -> J/psi eta)< 2.7 * 10^-5, and B(B0 -> J/psi eta')< 6.3 * 10-5.
description: 7 pages, 3 figures, submitted to Phys. Rev. Lett
Padovan numbers that are concatenations of two distinct repdigits
Creators: name: Ddamulira, Mahadi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B39, 11D45, 11D61, 11J86

description: Let $ (P_{n})_{n\ge 0} $ be the sequence of Padovan numbers defined by $ P_0=0 $, $ P_1 =1=P_2$, and $ P_{n+3}= P_{n+1} +P_n$ for all $ n\ge 0 $. In this paper, we find all Padovan numbers that are concatenations of two distinct repdigits.
description: Accepted manuscript. 9 pages
An accretion disk and radio spectra of pulsars
Creators: name: Prigara, F. V.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: On the basis of the unified model of compact radio sources, the dependence of a turnover frequency in the smoothed radio spectrum of a pulsar upon the ratio of the dispersion measure to the period of a pulsar is obtained. This relation is produced by the radial density wave in the accretion disk surrounding a pulsar. The unified model of compact radio sources gives also the smoothed spectral indices of radio emission from pulsars as $α=2$ for the gaseous disk with the temperature profile T=const and $α=3$ for the gaseous disk with the pressure profile P=const ($F_ν \propto ν^{- α} $).
description: 3 pages,LaTeX 2e, A talk given at the 2nd Gravitational Conference: Gravitation, Cosmology and Relativistic Astrophysics, June 23-27, 2003, Kharkov, Ukraine
Entropic Uncertainty Relations and the Quantum-to-Classical transition
Creators: name: Veeren, Isadora
name: de Melo, Fernando
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Our knowledge of quantum mechanics can satisfactorily describe simple, microscopic systems, but is yet to explain the macroscopic everyday phenomena we observe. Here we aim to shed some light on the quantum-to-classical transition as seen through the analysis of uncertainty relations. We employ entropic uncertainty relations to show that it is only by the inclusion of imprecision in our model of macroscopic measurements that we can prepare a system with two simultaneously well-defined quantities, even if their associated observables do not commute. We also establish how the precision of measurements must increase in order to keep quantum properties, a desirable feature for large quantum computers.
description: 6 pages, 2 figures. v2 - Improved text, references added. Comments are welcome
title: Perceptual and acoustic gender differences in the speech of 4 1/2 - 5 1/2 year old children.
Creators: name: Nairn, Moray
Publisher: name: The Open University
Year: 1997

description: The linguistic factors which identify a speaker as being either male or female are reasonably well understood and documented when we are considering adult speakers. Many of these factors become apparent at puberty when the sexes diverge along predictable anatomical and physiological paths. It might be expected, therefore, that prepubertal children should appear relatively undifferentiated in terms of gender and that young boys' and girls' speech should be sexually homogenous. This study has confirmed, however, that adult listeners can correctly identify the sex of a prepubertal child from samples of speech. Results of the present study yielded correct identification rates which varied between 66% (using isolated vowels as the sample) and 76% (using sentences as the sample) - all of these rates were significantly greater than chance. Girls were shown to be better identified by listeners than boys and female listeners tended to be more accurate at identifying gender than male listeners. During the acoustic phase of the study, a number of parameters were selected for measurement which were regarded as likely to be involved in the gender-identification process. Overall, there was a surprisingly large number of negative results, with only a very few parameters yielding significantly sex-different outcomes. No differences were found in Fo between the sexes and only 5 out of 18 comparisons of formant frequency showed significant differences. An investigation into vocal breathiness indicated that, on the basis of this parameter, children could be assigned into perceptual groupings ('most / least male-like') better than into biological sex groupings ('boy / girl'). The conclusion reached is that listeners may use different acoustic cues to identify children's sex from speech than adult's sex, alternatively or additionally, they may be able to focus their perceptive skills more finely on the small acoustic inequalities that exist. The concept of gender-specific speech is discussed in a general commentary of the various influences exerted in the formation of gendered-identities.
title: The impact of immunosuppression on nucleotide sequence diversity in the first hypervariable region (HVR1) of hepatitis C virus (HCV).
Creators: name: Lawal, Zarah Yetunde
Publisher: name: The Open University
Year: 1997

description: Hepatitis C virus (HCV) is responsible for most cases of non-A, non-B hepatitis. The persistent nature of this virus has been attributed to viral replication errors, which lead to a dynamic pool of antigenic variants that allow escape from the host immune response. A major part of this escape is due to the hypervariable region 1 (HVR1) of HCV, known to encode structurally flexible, isolate-specific neutralising epitopes which undergo successive genetic alterations. In a substantial number of cases, complications of HCV infection lead to end-stage liver disease for which the only treatment is orthotopic liver transplantation (OLT). Primary HCV infection of the allograft is an almost universal phenomenon associated with OLT. This study focused on the pattern of HCV variability in the context of immunosuppression, which is a feature of post-OLT treatment. Sequences of the HCV HVR1 derived from OLT recipients and from asymptomatic (presumably immunocompetent) carriers of the virus were compared over several time-points. A rapid turnover of sequences was found in the untreated subjects, in whom mean nucleotide and amino acid sequence diversity were 19.8% and 43.5%, respectively. In the immunosuppressed patients, the corresponding figures were 2.3% and 2.3%. Untreated subjects showed a ratio of transitional to transversional mutations of 2.57, compared with 0.98 for untreated subjects (p = 0.0165). Similarly, the replacement to silent mutation (R/S) ratios were 8.22 and 1.33 (p = 0.0069), respectively. The major differences between the two groups of patients were especially demonstrated by a subset of two immunosuppressed patients, in whom the HVRl showed almost 100% homogeneity throughout a year of follow-up. Both patients required re-transplantation within a year of the first OLT, and both died of HCV-related disease shortly afterwards. On the other hand, two other transplant recipients, who showed an HVRl mutation rate indistinguishable from that found in the untreated group, remain well 10 months and almost two years post-OLT. This investigation (1) demonstrated that the HCV genome becomes more homogenous post-OLT; (2) suggests that, at least in some patients, the lack of genetic heterogeneity may pre-date liver transplantation; (3) highlights the critical nature of host factors in determining the clinical course of post-OLT recurrent HCV infection; and (4) provides a model of hepatitis C viral kinetics in immunosuppressed and untreated individuals. The finding of HCV genomic sequences within the leukocytes provides molecular evidence for the existence of HCV in peripheral blood cells, and thus supports the hypothesis that peripheral blood lymphocytes act as HCV reservoirs for the reinfecting virions.
Single Proton Knock-Out Reactions from 24,25,26F
Creators: name: Thoennessen, M.
name: Baumann, R.
name: Brown, B. A.
name: Enders, J.
name: Frank, N.
name: Hansen, P. G.
name: Heckman, P.
name: Luther, B. A.
name: Seitz, J.
name: Stolz, A.
name: Tryggestad, E.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The cross sections of the single proton knock-out reactions from 24F, 25F, and 26F on a 12C target were measured at energies of about 50 MeV/nucleon. Ground state populations of 6.6+-.9 mb, 3.8+-0.6 mb for the reactions 12C(24F,23O) and 12C(25F,24O) were extracted, respectively. The data were compared to calculations based on the many-body shell model and the eikonal theory. In the reaction 12C(26F,25O) the particle instability of 25O was confirmed.
How to teach Quantum Mechanics
Creators: name: Passon, Oliver
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the spirit and style of John S. Bell's well known paper on How to Teach Special Relativity it is argued, that a ``Bohmian pedagogy''provides a very useful tool to illustrate the relation between classical and quantum physics and illuminates the peculiar features of the latter.
description: 7 pages, 1 figure
A search for microquasar candidates at low galactic latitudes
Creators: name: Paredes, J. M.
name: Ribo, M.
name: Marti, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent studies of relativistic jet sources in the Galaxy, also known as microquasars, have been very useful in trying to understand the accretion/ejection processes that take place near compact objects. However, the number of sources involved in such studies is still small. In an attempt to increase the number of known microquasars we have carried out a search for new Radio Emitting X-ray Binaries (REXBs). These sources are the ones to be observed later with VLBI techniques to unveil their possible microquasar nature. To this end, we have performed a cross-identification between the X-ray ROSAT all sky survey Bright Source Catalog (RBSC) and the radio NRAO VLA Sky Survey (NVSS) catalogs under very restrictive selection criteria for sources with |b|<5 degrees. We have also conducted a deep observational radio and optical study for six of the selected candidates. At the end of this process two of the candidates appear to be promising, and deserve additional observations aimed to confirm their proposed microquasar nature.
description: 11 pages, 4 figures. Published in A&A, see http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2002A%26A...394..193P
Oscillation in the temperature profile of the large-scale circulation of turbulent convection induced by a cubic container
Creators: name: Ji, Dandan
name: Brown, Eric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present observations of oscillations in the shape of the temperature profile of the large-scale circulation (LSC) of turbulent Rayleigh-B{é}nard convection. Temperature measurements are broken down into Fourier moments as a function of $θ-θ_0$, where $θ$ is the azimuthal angle in a horizontal plane at mid-height, and $θ_0$ is the LSC orientation. The oscillation structure is dominated by a 3rd order sine moment and 3rd order cosine moment in a cubic cell. In contrast, these moments are not found to oscillate in a cylindrical cell. This geometry-dependent behavior can be explained by a model that assumes that the heat transported by the LSC is conducted from the thermal boundary layers, and is proportional to pathlength of the LSC along boundary layers at the top and bottom plates. In a non-circular cross-section cell, oscillations of the LSC orientation $θ_0$ result in an oscillation in the container shape in the reference frame of the LSC, resulting in an oscillation in the pathlength of the LSC at a given $θ-θ_0$. In a square-cross-section cell, this model predicts the dominant 3rd order sine moment and 3rd order cosine moment with magnitudes within 50\% of measured values, when using the amplitude of the oscillation of $θ_0$ as input. A cylindrical cell is special in that the pathlength is independent of $θ_0$, and so these oscillating moments are not induced. In a cylindrical cell, the model reproduces the sinusoidal mean temperature profile with a sloshing oscillation dominated by the 2nd order sine moment, consistent with previous observations in that geometry.
description: 13 figures, 18 pages
The effects of UV background correlations on LyA forest flux statistics
Creators: name: Meiksin, Avery
name: White, Martin
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the possible effects of UV background fluctuations on the pixel flux power spectrum and auto-correlation function of the LyA forest due to a finite number of sources in an attenuating medium. We consider scenarios in which QSO sources dominate the contribution to the UV background. To estimate their contribution, we use the QSO luminosity functions from the 2dF and Sloan QSO surveys. We estimate self-consistent values for the attenuation length at the Lyman edge through the Intergalactic Medium using Particle Mesh simulations of the LyA forest, normalised by the measured mean LyA flux. We examine the convergence properties of the flux power spectrum and auto-correlation function under differing assumptions regarding pressure-smoothing. Convergence to better than 10% in the flux power spectrum at proper wavenumbers k < 0.015s/km requires a comoving resolution of 30-60kpc/h in a comoving box of size 25Mpc/h at z = 5, with the requirements becoming more severe at lower redshifts. We find much better covergence properties for the relative effects of the UV background fluctuations on the flux power spectrum. The background fluctuations increase the large-scale power and suppress the power at intermediate scales. At z < 4, the effect is only at the few percent level. By z > 5, however, the large-scale power is boosted by more than 50%, suggesting the flux power spectrum may serve as a useful tool for distinguishing QSO-dominated UV background scenarios from those dominated by galaxies.
description: 21 pages, LaTeX file with embedded Postscript figures; submitted to MNRAS
Jointly Learning to Recommend and Advertise
Creators: name: Zhao, Xiangyu
name: Zheng, Xudong
name: Yang, Xiwang
name: Liu, Xiaobing
name: Tang, Jiliang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Online recommendation and advertising are two major income channels for online recommendation platforms (e.g. e-commerce and news feed site). However, most platforms optimize recommending and advertising strategies by different teams separately via different techniques, which may lead to suboptimal overall performances. To this end, in this paper, we propose a novel two-level reinforcement learning framework to jointly optimize the recommending and advertising strategies, where the first level generates a list of recommendations to optimize user experience in the long run; then the second level inserts ads into the recommendation list that can balance the immediate advertising revenue from advertisers and the negative influence of ads on long-term user experience. To be specific, the first level tackles high combinatorial action space problem that selects a subset items from the large item space; while the second level determines three internally related tasks, i.e., (i) whether to insert an ad, and if yes, (ii) the optimal ad and (iii) the optimal location to insert. The experimental results based on real-world data demonstrate the effectiveness of the proposed framework. We have released the implementation code to ease reproductivity.
description: Proceedings of the 26th ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD '20), August 23--27, 2020, Virtual Event, CA, USA
Accurate Spectral energy distributions and selection effects for high-redshift dusty galaxies: a new hot population to discover with the Spitzer Space Telescope?
Creators: name: Blain, Andrew W.
name: Chapman, Scott C.
name: Smail, Ian
name: Ivison, Rob
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The spectral energy distributions (SEDs) of dust-enshrouded galaxies with powerful restframe far-infrared emission have been constrained by a range of ground-based and space-borne surveys. The IRAS catalog provides a reasonably complete picture of the dust emission from nearby galaxies (at redshifts of order 0.1) that are typically less luminous than about 10 to the 12 solar luminosities. However, at higher redshifts, the observational coverage from all existing far-IR and submillimeter surveys is much less complete. Here we investigate the SEDs of a new sample of high-redshift submillimeter-selected galaxies (SMGs), for which redshifts are known, allowing us to estimate reliable luminosities and characteristic dust temperatures. We demonstrate that a wide range of SEDs is present in the population, and that a substantial number of luminous dusty galaxies with hotter dust temperatures could exist at similar redshifts (of order 2 to 3), but remain undetected in existing submillimeter surveys. These hotter galaxies could be responsible for about a third of the extragalactic IR background radiation at a wavelength of about 100 microns. The brightest of these galaxies would have far-IR luminosities of order 10 to the 13 solar luminosities and dust temperatures of order 60 K. Galaxies up to an order of magnitude less luminous with similar SEDs will be easy to detect and identify in the deepest Spitzer Space Telescope observations of extragalactic fields at 24 microns.
description: 8 pages; 4 figures; in press at ApJ (10 August 2004). Revised to match ApJ proof