cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Constraints on interacting dark energy models from galaxy Rotation Curves
Creators: name: Baldi, Marco
name: Salucci, Paolo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: [Abridged] High-resolution N-body simulations have recently shown that the structural properties of highly nonlinear cosmic structures, as e.g. their average concentration at a given mass, could be significantly modified in the presence of an interaction between Dark Energy and Dark Matter. While a constant interaction strength leads to less concentrated density profiles, a steep growth in time of the coupling function has been shown to determine a large increase of halo concentrations over a wide range of masses, including the typical halos hosting luminous spiral galaxies. This determines a substantial worsening of the "cusp-core" tension arising in the standard $Λ$CDM model and provides a direct way to constrain the form of the Dark Energy interaction. In the present paper we make use of the outcomes of some high-resolution N-body simulations of a specific class of interacting Dark Energy models to compare the predicted rotation curves of luminous spiral galaxies forming in these cosmologies against real observational data. Our results show how some specific interacting Dark Energy scenarios featuring a steep growth in time of the coupling function -- which are virtually indistinguishable from LCDM in the background -- cannot fit the observed rotation curves of luminous spiral galaxies and can therefore be ruled out only on the basis of dynamical properties of small-scale structures. Our study is a pilot investigation of the effects of a Dark Energy interaction at small scales, and demonstrates how the dynamical properties of visible galaxies can in some cases provide direct constraints on the nature of Dark Energy.
description: 15 pages, 3 figures. Accepted for publication in JCAP
Nonanalyticity of the optimized effective potential with finite basis sets
Creators: name: Gidopoulos, Nikitas I.
name: Lathiotakis, Nektarios N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We show that the finite-basis optimized effective potential (OEP) equations exhibit previously unknown singular behavior.Imposing continuity, we derive new well-behaved finite-basis-set OEP equations that determine OEP for any orbital and any large enough potential basis sets and which adopt an analytic solution via matrix-inversion.
Implementation of mean-timing and subsequent logic functions on an FPGA
Creators: name: Bieling, J.
name: Ahluwalia, G.
name: Barth, J.
name: Klein, F.
name: Pretz, J.
name: Fischer, H.
name: Herrmann, F.
name: Schill, C.
name: Schopferer, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: This article describes the implementation of a mean-timer and coincidence logic on a Virtex-5 FPGA for trigger purposes in a particle physics experiment. The novel feature is that the mean-timing and the coincidence logic are not synchronized with a clock which allows for a higher resolution of approximately 400 ps, not limited by a clock frequency.
description: 15 pages, 11 figures
Calgary Insect Pollinator Diversity and Native Plant Associations
Creators: name: Vermaak, Sarah
name: Seal, Michaela
name: Ford-Sahibzada, Taylor
name: Summers, Mindi
Publisher: name: Biological Sciences
Year: 2021
Subjects: insect
pollinator
insect pollinator
plant-pollinator relationship
plant-insect pollinator relationship
native Alberta plants
Alberta
Calgary
iNaturalist

description: Insects pollinate roughly 75% of Earth’s flowering plants, and while Calgary hosts a large number of diverse insect pollinators, its insect diversity and plant associations had not yet been cataloged. This study sought to document the diversity of Calgary’s insect pollinators and determine which native plants support them. We observed and combined observations of plant-pollinator relationships collected through iNaturalist (3168 observations) from 2008-2021, physical collections and observations from specific plants in 2020 (1840 observations), and observations of insects visiting flowers during transect (294 observations) and quadrat (225 observations) surveys in 2021. We compared the number and association type for 59 native plants, and nine major insect groups (flies, beetles, true bugs, wasps, solitary bees, butterflies, ants, bumble bees, and honey bees). We identified 63 families, 148 genera, and 194 species of insects. We found the greatest number of species and plant-pollinator associations for flies and solitary bees, followed by bumble bees and butterflies. We also identified ten native plants that were associated with the greatest number of major insect groups. The results of this project will aid conservation and restoration efforts by providing guidance to city planners, landscape designers, and gardeners on which plants best support our city’s pollinators.
Braid group statistics implies scattering in three-dimensional local quantum physics
Creators: name: Bros, Jacques
name: Mund, Jens
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81T05

description: It is shown that particles with braid group statistics (Plektons) in three-dimensional space-time cannot be free, in a quite elementary sense: They must exhibit elastic two-particle scattering into every solid angle, and at every energy. This also implies that for such particles there cannot be any operators localized in wedge regions which create only single particle states from the vacuum and which are well-behaved under the space-time translations (so-called temperate polarization-free generators). These results considerably strengthen an earlier "NoGo-theorem for 'free' relativistic Anyons". As a by-product we extend a fact which is well-known in quantum field theory to the case of topological charges (i.e., charges localized in space-like cones) in d>3, namely: If there is no elastic two-particle scattering into some arbitrarily small open solid angle element, then the 2-particle S-matrix is trivial.
description: 25 pages, 4 figures. Comment on model-building added in the introduction
Resonant Disruptions: Understanding Nurses’ Practice with Youth Survivors of Sexual Exploitation
Creators: name: Giebelhaus, Danielle Erinn
Publisher: name: Nursing
Year: 2022
Subjects: subject: Public and Social Welfare
subject: Human Development
subject: Mental Health
subject: Nursing
subject: FOS: Health sciences
subject: Psychology--Developmental
subject: Psychology--Social

description: The sexual exploitation of youth is a global and local concern. Youth survivors of sexual exploitation often present to and require healthcare services but most nurses do not feel effectively equipped to care for this population. There is currently little nursing literature to guide nurses in their practice with youth survivors. In this thesis, I report on a study undertaken using philosophical hermeneutics guided by the work of Hans-Georg Gadamer and other contemporary hermeneutic theorists. Hermeneutics is a useful way to conduct research when little is known about a topic. I ask the research question, “How might we understand nurses’ experiences of working with youth survivors of sexual exploitation?” In hermeneutic research, interpretations provide the basis for answering the research question. Three interpretations are discussed in this study: stigma, refuge, and beautiful words; how to convey mattering to youth survivors of SE; and what nurses hold onto for themselves and their patients. The findings point to an increase in understanding of nursing experience, and to clear need for increased training for nurses and other healthcare professionals.
A change in stripes for cholesteric shells via anchoring in moderation
Creators: name: Tran, Lisa
name: Lavrentovich, Maxim O.
name: Durey, Guillaume
name: Darmon, Alexandre
name: Haase, Martin F.
name: Li, Ningwei
name: Lee, Daeyeon
name: Stebe, Kathleen J.
name: Kamien, Randall D.
name: Lopez-Leon, Teresa
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Chirality, ubiquitous in complex biological systems, can be controlled and quantified in synthetic materials such as cholesteric liquid crystal (CLC) systems. In this work, we study spherical shells of CLC under weak anchoring conditions. We induce anchoring transitions at the inner and outer boundaries using two independent methods: by changing the surfactant concentration or by raising the temperature close to the clearing point. The shell confinement leads to new states and associated surface structures: a state where large stripes on the shell can be filled with smaller, perpendicular sub-stripes, and a focal conic domain (FCD) state, where thin stripes wrap into at least two, topologically required, double spirals. Focusing on the latter state, we use a Landau-de Gennes model of the CLC to simulate its detailed configurations as a function of anchoring strength. By abruptly changing the topological constraints on the shell, we are able to study the interconversion between director defects and pitch defects, a phenomenon usually restricted by the complexity of the cholesteric phase. This work extends the knowledge of cholesteric patterns, structures that not only have potential for use as intricate, self-assembly blueprints but are pervasive in biological systems.
description: 27 pages, 10 figures
MOESM1 of Exploring the contributions of two glutamate decarboxylase isozymes in Lactobacillus brevis to acid resistance and Îł-aminobutyric acid production
Creators: name: Lyu, Changjiang
name: Zhao, Weirui
name: Peng, Chunlong
name: Hu, Sheng
name: Fang, Hui
name: Hua, Yujiao
name: Yao, Shanjing
name: Huang, Jun
name: Mei, Lehe
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Neuroscience
subject: Biotechnology
subject: Evolutionary Biology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Developmental Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Computational Biology

description: Additional file 1. Figure S1. (A), Gene organization of the gad gene cluster in L. brevis CGMCC1306 (not drawn to scale). (B), Nucleotide sequence and expression signals of the gad gene cluster in L. brevis CGMCC1306. Parts of deduced amino acid sequences of the genes are given below the sequence. Facing arrows, inverted repeats; -10 and -35 promoter sequences are underlined and in boldface; vertical arrows, transcription stare points; rbs, ribosome-binding site (nucleotides indicated in lower case). Stop codons are indicated with asterisks; start codons are in bold face.
A conjecture on Exceptional Orthogonal Polynomials
Creators: name: Gomez-Ullate, David
name: Kamran, Niky
name: Milson, Robert
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 33C45, 33C47

description: Exceptional orthogonal polynomial systems (X-OPS) arise as eigenfunctions of Sturm-Liouville problems and generalize in this sense the classical families of Hermite, Laguerre and Jacobi. They also generalize the family of CPRS orthogonal polynomials. We formulate the following conjecture: every exceptional orthogonal polynomial system is related to a classical system by a Darboux-Crum transformation. We give a proof of this conjecture for codimension 2 exceptional orthogonal polynomials (X2-OPs). As a by-product of this analysis, we prove a Bochner-type theorem classifying all possible X2-OPS. The classification includes all cases known to date plus some new examples of X2-Laguerre and X2-Jacobi polynomials.
ผลกระทบของความต้องการเอทานอลต่อมันสำปะหลัง อ้อย กากน้ำตาล และน้ำมันแก๊สโซฮอล์
Creators: name: กัมพล เชื้อแถว
Publisher: name: คณะบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร มหาวิทยาลัยนเรศวร
Year: 2561
Subjects: แบบจำลองระบบสมการเกี่ยวเนื่อง
กำลังสองน้อยที่สุดสามชั้น
เอทานอล
แก๊สโซฮอล์
Simultaneous Equation Model
Three Stage Least Square
Ethanol
Gasohol

description: วารสารบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร, 13, 1, 150-168
Dynamic Greedy Algorithms for the Edwards-Anderson Model
Creators: name: Schnabel, Stefan
name: Janke, Wolfhard
Publisher: name: arXiv
Year: 2018
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: To provide a novel tool for the investigation of the energy landscape of the Edwards-Anderson spin-glass model we introduce an algorithm that allows an efficient execution of a greedy optimization based on data from a previously performed optimization for a similar configuration. As an application we show how the technique can be used to perform higher-order greedy optimizations and simulated annealing searches with improved performance.
description: 9 pages, 10 figures
A Monte-Carlo generator for statistical hadronization in high energy e+e- collisions
Creators: name: Bignamini, C.
name: Becattini, F.
name: Piccinini, F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a Monte-Carlo implementation of the Statistical Hadronization Model in e+e- collisions. The physical scheme is based on the statistical hadronization of massive clusters produced by the event generator Herwig within the microcanonical ensemble. We present a preliminary comparison of several observables with measurements in e+e- collisions at the Z peak. Although a fine tuning of the model parameters is not carried out, a general good agreement between its predictions and data is found.
description: 19 pages, 28 figures, 6 tables. v2: added sections on comparison between the Statistical Hadronization Model and the Cluster Model and on the interplay between Herwig cluster splitting algorithm and Statistical Hadronization Model predictions. Fixed typos and references added. Version accepted for publication in EPJC
Shaping nanoparticle fingerprints at the interface of cholesteric droplets
Creators: name: Tran, Lisa
name: Kim, Hye-Na
name: Li, Ningwei
name: Yang, Shu
name: Stebe, Kathleen J.
name: Kamien, Randall D.
name: Haase, Martin F.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The ordering of nanoparticles into predetermined configurations is of importance to the design of advanced technologies. In this work, we moderate the surface anchoring against the bulk elasticity of liquid crystals to dynamically shape nanoparticle assemblies at a fluid interface. By tuning the degree of nanoparticle hydrophobicity with surfactants that alter the molecular anchoring of liquid crystals, we pattern nanoparticles at the interface of cholesteric liquid crystal emulsions. Adjusting the particle hydrophobicity more finely further modifies the rigidity of assemblies. We establish that patterns are tunable by varying both surfactant and chiral dopant concentrations. Since particle assembly occurs at the interface with the desired structures exposed to the surrounding phase, we demonstrate that particles can be readily crosslinked and manipulated, forming structures that retain their shape under external perturbations. This study establishes the templating of nanomaterials into reconfigurable arrangements. Interfacial assembly is tempered by elastic patterns that arise from the geometric frustration of confined cholesterics. This work serves as a basis for creating materials with chemical heterogeneity and with linear, periodic structures, essential for optical and energy applications.
description: 16 pages with 5 figures, 4 page supplementary with 5 supplementary figures
The Market for Food in the Nation's Schools
Creators: name: Kriesberg, Martin
name: Kriesberg, Martin
Publisher: name: Unknown
Year: 1965
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Research Methods/ Statistical Methods

description: Excerpts from the report Preface: This report is based on a study of the market for food in schools during 1962-63. Comparison with a benchmark survey conducted 5 years earlier shows that during the intervening period the number of public school districts decreased by one-third, while pupil enrollment increased by about 10 percent. The number of lunches served in the National School Lunch Program expanded rapidly--at least 20 percent--during these 5 years. The objective of this report is to provide a current measure of the school food market, which will reflect shifts in quantities and types of foods served in school lunchrooms. It also contains an evaluation of trends in school feeding and identifies areas warranting special attention in the operation of the National School Lunch and Special Milk Programs of the U.S. Department of Agriculture. The study on which this report is based was part of a broad program of research relating to the public food distribution program, which is concerned with expanding the market for farm products and improving nutritional levels among children and needy people.
ศึกษาแนวทางการปรับกลยุทธ์การบริหารของผู้ประกอบการธุรกิจขนาดกลางและขนาดย่อม ในเขตภาคตะวันออกเฉียงเหนือตอนล่าง 2
Creators: name: กิตติมา จึงสุวดี
Publisher: name: คณะบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร มหาวิทยาลัยนเรศวร
Year: 2561
Subjects: กลยุทธ์การบริหารธุรกิจ
ความสามารถในการแข่งขัน
ธุรกิจของธุรกิจขนาดกลางขนาดย่อมในภาคตะวันออกเฉียงเหนือตอนล่าง 2
กลยุทธ์การบริหารที่ส่งผลต่อผลประกอบการของธุรกิจ
Business strategies
Competitiveness of SMEs
Small and Medium Enterprises (SMEs) in Lower-Northeastern Region 2
Management Strategies Effecting Business Performances

description: วารสารบริหารธุรกิจ เศรษฐศาสตร์และการสื่อสาร, 13, 1, 169-184
Macintosh Type/Creator Codes: Improving identification of files from MacOS Classic
Creators: name: Thorsted, Tyler
Publisher: name: Zenodo
Year: 2024

description: Working with Macintosh files from the 1980 to early 2000’s can be challenging as they are often on difficult to access disks, unique encoding, have resource forks, and often don’t use extensions. Identification of files from a Macintosh formatted disk can be accomplished with identification methods such as PRONOM, but what if those standard methods come up empty or are misleading? This paper investigates a method of identification which can provide better results compared to existing methods. The Macintosh operating system used special extended attribute codes to not only identify the file type, but also the original creating application. Called Type / Creator codes, these extended attributes are often lost or hidden to the user during preservation activities but can provide important information for long term preservation. These codes along with resource forks can provide necessary information for emulation and migration activities.
Unbalanced Pomeransky-Sen'kov black ring
Creators: name: Chen, Yu
name: Hong, Kenneth
name: Teo, Edward
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Pomeransky-Sen'kov solution is well known to describe an asymptotically flat doubly rotating black ring in five dimensions, whose self-gravity is exactly balanced by the centrifugal force arising from the rotation in the ring direction. In this paper, we generalise this solution to the unbalanced case, in which there is in general a conical singularity in the space-time. Unlike a previous form of this solution presented in the literature, our form is much more compact. We describe in detail how this solution can be derived using the inverse-scattering method, and study its various properties. In particular, we show how various known limits can be recovered as special cases of this solution.
description: 26 pages, 2 figures, LaTeX; minor changes, published version
The damped stochastic wave equation on p.c.f. fractals
Creators: name: Hambly, Ben
name: Yang, Weiye
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H15, 35R60, 28A80, 35L05

description: A p.c.f. fractal with a regular harmonic structure admits an associated Dirichlet form, which is itself associated with a Laplacian. This Laplacian enables us to give an analogue of the damped stochastic wave equation on the fractal. We show that a unique function-valued solution exists, which has an explicit formulation in terms of the spectral decomposition of the Laplacian. We then use a Kolmogorov-type continuity theorem to derive the spatial and temporal Hölder exponents of the solution. Our results extend the analogous results on the stochastic wave equation in one-dimensional Euclidean space. It is known that no function-valued solution to the stochastic wave equation can exist in Euclidean dimension two or higher. The fractal spaces that we work with always have spectral dimension less than two, and show that this is the right analogue of dimension to express the "curse of dimensionality" of the stochastic wave equation. Finally we prove some results on the convergence to equilibrium of the solutions.
Modeling and Control of Single-Phase Power Electronic Converters and Islanded Microgrids using the Dynamic Phasor Method
Creators: name: Nwaneto, Udoka Chile
Publisher: name: Schulich School of Engineering
Year: 2022
Subjects: subject: Dynamic Phasor
subject: Power Electronic Converters
subject: Single-Phase
subject: Grid-Forming Inverter
subject: Grid-Following Inverter
subject: DC-DC Converter
subject: Diode-Bridge Rectifier
subject: Active Rectifier
subject: Islanded Microgrids
subject: Control
subject: Modeling
subject: Engineering--Electronics and Electrical

description: The structure and behaviour of electrical grids are rapidly changing due to the increasing grid integration of inverter-based resources (IBRs) and the adoption of electric vehicles in low-voltage distribution grids. The changes emphasize the need for a holistic modification of methods used in modeling and simulating power systems. The electromagnetic transients (EMT) simulations based on detailed switching time-domain models, represent the true dynamics of power systems and converters. However, EMT simulations require long execution times. With the increasing integration of IBRs in the power system, static phasor-type simulations may be inaccurate because of reduced system inertia and strong interaction of the control schemes of IBRs with line dynamics. The dynamic phasor (DP) method is an alternative method to develop computationally efficient and accurate power system models. The DP method gives the user the freedom to select dominant harmonics and dynamics to model which in turn, enables the use of large step sizes to accelerate simulations. In the literature, little attention has been paid to DP-based modeling of single-phase low-voltage systems. Considering the upsurge in the deployment of residential microgrids, developing robust and well-validated DP models of single-phase power converters and microgrids is pertinent. This thesis augments the library of DP models by extending the DP method to the modeling of nonlinear (Lyapunov) and linear controller-based single-phase grid-following and grid-forming inverters, H-bridge active rectifiers, droop-controlled microgrids, diode-bridge rectifiers, and non-isolated DC-DC converters. Additionally, this thesis proposes the DP model of a synchronization unit suitable for (re)connecting a grid-forming inverter to a microgrid. To ensure that the proposed DP models have similar dynamic and steady-state responses as the detailed switching models, this thesis proposes a methodological approach of developing small-signal and large-signal DP models for control design purposes. The fidelity of the proposed DP models are validated with experimental and detailed switching model results. Simulation results confirm the high fidelity of the proposed DP models to produce results with comparable accuracy as the detailed switching models while using less simulation execution time. The proposed DP models will be useful to researchers and engineers interested in conducting fast-paced and accurate study of power electronics-dominated low-voltage grids.
Polymer simulation by means of tree data-structures and a parsimonious Metropolis algorithm
Creators: name: Schnabel, Stefan
name: Janke, Wolfhard
Publisher: name: arXiv
Year: 2019
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show how a Monte Carlo method for generating self-avoiding walks on lattice geometries which employs a binary-tree data structure can be adapted for hard-sphere polymers with continuous degrees of freedom. Data suggests that the time per Monte Carlo move scales logarithmically with polymer size. We combine the method with a variant of the Metropolis algorithm and preserve this scaling for Lennard-Jones polymers with untruncated monomer-monomer interaction. We further show how the replica-exchange method can be adapted for the same purpose.
description: 10 pages, 10 figures
MOESM3 of Increased activated regulatory T cell subsets and aging Treg-like cells in multiple myeloma and monoclonal gammopathy of undetermined significance: a case control study
Creators: name: Wang, Ji-nuo
name: Cao, Xin-xin
name: Zhao, Ai-lin
name: Cai, Hao
name: Wang, Xuan
name: Li, Jian
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Space Science
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 3. The suppressive percentage of Treg subsets from MM patients and healthy volunteers.
The Canonical Lattice Isomorphism between Topologies Compatible with a Linear Space
Creators: name: Aoyama, Takanobu
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Topology (math.GN)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 54A10

description: We consider all compatible topologies of an arbitrary finite-dimensional vector space over a non-trivial valuation field whose metric completion is a locally compact space. We construct the canonical lattice isomorphism between the lattice of all compatible topologies on the vector space and the lattice of all subspaces of the vector space whose coefficient field is extended to the complete valuation field. Moreover, in this situation, we use this isomorphism to characterize the continuity of linear maps between finite-dimensional vector spaces endowed with given compatible topologies, and also, we characterize all Hausdorff compatible topologies.
description: 17 pages, no figures, references and a new proposition (Proposition 5.2) are added
Universal Bound States of Two Particles in Mixed Dimensions or Near a Mirror
Creators: name: Tan, Shina
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Nuclear Theory (nucl-th)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Some novel TWO-body effects analogous to the well-known THREE-body Efimov effect are predicted. In the systems considered, particle A is constrained on a TRUNCATED or BENT one-dimensional line or two-dimensional plane, or on one side of a flat mirror in three dimensions (3D). The constraining potential is fine-tuned such that particle A's ground state wave function is a constant in the region in which it is constrained. Particle B moves in 3D and interacts with particle A resonantly. An infinite sequence of giant two-body bound states are found in each case.
description: 5 pages, 2 figures
Phase Space Tomography of Matter-Wave Diffraction in the Talbot Regime
Creators: name: Lee, S. K.
name: Kim, M. S.
name: Szewc, C.
name: Ulbricht, H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report on the theoretical investigation of Wigner distribution function (WDF) reconstruction of the motional quantum state of large molecules in de Broglie interference. De Broglie interference of fullerenes and as the like already proves the wavelike behaviour of these heavy particles, while we aim to extract more quantitative information about the superposition quantum state in motion. We simulate the reconstruction of the WDF numerically based on an analytic probability distribution and investigate its properties by variation of parameters, which are relevant for the experiment. Even though the WDF described in the near-field experiment cannot be reconstructed completely, we observe negativity even in the partially reconstructed WDF. We further consider incoherent factors to simulate the experimental situation such as a finite number of slits, collimation, and particle-slit van der Waals interaction. From this we find experimental conditions to reconstruct the WDF from Talbot interference fringes in molecule Talbot-Lau interferometry.
description: 16 pages, 9 figures, accepted at New Journal of Physics
Milk and Milk Products in the Nation's Schools
Creators: name: Freund, William H.
name: Reese, Robert B.
name: Freund, William H.
name: Reese, Robert B.
Publisher: name: Unknown
Year: 1965
Subjects: subject: Agricultural and Food Policy
subject: Demand and Price Analysis
subject: Food Consumption/Nutrition/Food Safety
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business

description: Excerpts from the report: This study of consumption of milk and milk products in public and private elementary and secondary schools is one in a group evaluating selected aspects of public food distribution programs. The research upon which this report is based is part of a broad program designed to expand the market for farm products and provide better nutrition for the Nation. This study is concerned with where, when, and at what price milk is made available in schools. It also explores the potentials for further expansion in consumption of milk and other dairy products in schools. The report is based upon findings from two surveys. A national survey of school food services was conducted during March 1962 in a randomly selected sample of about 5,000 public and 1,000 private elementary and secondary schools. A second survey of the market for food in schools was carried out during 1962-63 in a subsample of schools providing food services.
The Resonant Transneptunian Populations
Creators: name: Gladman, B.
name: Lawler, S. M.
name: Petit, J-M.
name: Kavelaars, J.
name: Jones, R. L.
name: Parker, J. Wm.
name: Van Laerhoven, C.
name: Nicholson, P.
name: Rousselot, P.
name: Bieryla, A.
name: Ashby, M. L. N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The transneptunian objects (TNOs) trapped in mean-motion resonances with Neptune were likely emplaced there during planet migration late in the giant-planet formation process. We perform detailed modelling of the resonant objects detected in the Canada-France Ecliptic Plane Survey (CFEPS) in order to provide population estimates and, for some resonances, constrain the complex internal orbital element distribution. Detection biases play a critical role because phase relationships with Neptune make object discovery more likely at certain longitudes. This paper discusses the 3:2, 5:2, 2:1, 3:1, 5:1, 4:3, 5:3, 7:3, 5:4, and 7:4 mean-motion resonances, all of which had CFEPS detections, along with our upper limit on 1:1 Neptune Trojans (which is consistent with their small population estimated elsewhere). For the plutinos (TNOs in the 3:2 resonance) we refine the orbital element distribution given in Kavelaars et al. (2009) and show that steep H-magnitude distributions (N(H) proportional to 10aH, with a=0.8-0.9) are favoured in the range Hg=8-9, and confirm that this resonance does not share the inclination distribution of the classical Kuiper Belt. We give the first population estimate for the 5:2 resonance and find that, to within the uncertainties, the population is equal to that of the 3:2 (13,000 TNOs with Hg < 9.16), whereas the 2:1 population is smaller by a factor of 3-4 compared to the other two resonances. We also measure significant populations inhabiting the 4:3, 5:3, 7:3, 5:4, 7:4, 3:1, and 5:1 resonances, with Hg < 9.16 (D >100 km) populations in the thousands. We compare our intrinsic population and orbital-element distributions with several published models of resonant-TNO production; the most striking discrepancy is that resonances beyond the 2:1 are in reality more heavily populated than in published models.
description: Accepted to AJ. Full dataset, survey simulator, and synthetic models available at http://www.cfeps.net
The automorphism groups of some token graphs
Creators: name: Ibarra, Sofía
name: Rivera, Luis Manuel
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 05C76, 05C60

description: In this paper we obtain the automorphism groups of the token graphs of some graphs. In particular we obtain the automorphism group of the $k$-token graph of the path graph $P_n$, for $n\neq 2k$. Also, we obtain the automorphism group of the $2$-token graph of the following graphs: cycle, star, fan and wheel graphs.
description: 18 pages, 8 figures. Version 3 is a revised version. Proyecciones Journal of Mathematics, to appear
Note on Higgs Decay into Two Photons $H\to γγ$
Creators: name: Huang, Da
name: Tang, Yong
name: Wu, Yue-Liang
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The Higgs decay $H\to γγ$ duo to the virtual $W$-loop effect is revisited in the unitary gauge by using the symmetry-preserving and divergent-behavior-preserving loop regularization method, which is realized in the four dimensional space-time without changing original theory. Though the one-loop amplitude of $H\to γγ$ is finite as the Higgs boson in the standard model has no direct interaction with the massless photons at tree level, while it involves both tensor-type and scalar-type divergent integrals which can in general destroy the gauge invariance without imposing a proper regularization scheme to make them well-defined. As the loop regularization scheme can ensure the consistency conditions between the regularized tensor-type and scalar-type divergent irreducible loop integrals to preserve gauge invariance, we explicitly show the absence of decoupling in the limit $M_W/M_H\to0$ and obtain a result agreed exactly with the earlier one in the literature. We then clarify the discrepancy between the earlier result and the recent one obtained by R. Gastmans, S.L. Wu and T.T. Wu. The advantage of calculation in the unitary gauge becomes manifest that the non-decoupling arises from the longitudinal contribution of the $W$ gauge boson.
description: 13 pages, 2 figures, references added, advantage of loop regularization method with the concept of irreduciable loop integral is emphasized, published version
On a new parameter involving Ramanujan's theta-functions
Creators: name: Chandankumar, S.
name: Bharadwaj, H. S. Sumanth
name: Yadav, Vijay
Publisher: name: arXiv
Year: 2019
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 05A17, 11P83

description: We define a new parameter $A'_{k,n}$ involving Ramanujan's theta-functions for any positive real numbers $k$ and $n$ which is analogous to the parameter $A_{k,n}$ defined by Nipen Saikia \cite{NS1}. We establish some modular relation involving $A'_{k,n}$ and $A_{k,n}$ to find some explicit values of $A'_{k,n}$. We use these parameters to establish few general theorems for explicit evaluations of ratios of theta functions involving $φ(q)$.
Monte Carlo Study of a U(1)xU(1) system with π-statistical Interaction
Creators: name: Geraedts, Scott D.
name: Motrunich, Olexei I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a $U(1)\times U(1)$ system with two species of loops with mutual $π$-statistics in (2+1) dimensions. We are able to reformulate the model in a way that can be studied by Monte Carlo and we determine the phase diagram. In addition to a phase with no loops, we find two phases with only one species of loop proliferated. The model has a self-dual line, a segment of which separates these two phases. Everywhere on the segment, we find the transition to be first-order, signifying that the two loop systems behave as immiscible fluids when they are both trying to condense. Moving further along the self-dual line, we find a phase where both loops proliferate, but they are only of even strength, and therefore avoid the statistical interactions. We study another model which does not have this phase, and also find first-order behavior on the self-dual segment.
description: 4 pages, 5 figures
The Soft Landing Problem: Minimizing Energy Loss by a Legged Robot Impacting Yielding Terrain
Creators: name: Lynch, Daniel J.
name: Lynch, Kevin M.
name: Umbanhowar, Paul B.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Enabling robots to walk and run on yielding terrain is increasingly vital to endeavors ranging from disaster response to extraterrestrial exploration. While dynamic legged locomotion on rigid ground is challenging enough, yielding terrain presents additional challenges such as permanent ground deformation which dissipates energy. In this paper, we examine the soft landing problem: given some impact momentum, bring the robot to rest while minimizing foot penetration depth. To gain insight into properties of penetration depth-minimizing control policies, we formulate a constrained optimal control problem and obtain a bang-bang open-loop force profile. Motivated by examples from biology and recent advances in legged robotics, we also examine impedance-control solutions to the dimensionless soft landing problem. Through simulations, we find that optimal impedance reduces penetration depth nearly as much as the open-loop force profile, while remaining robust to model uncertainty. Through simulations and experiments, we find that the solution space is rich, exhibiting qualitatively different relationships between impact velocity and the optimal impedance for small and large dimensionless impact velocities. Lastly, we discuss the relevance of this work to minimum-cost-of-transport locomotion for several actuator design choices.
Activity dependent synaptic plasticity and microfluidics
Creators: name: Coquinco, Ainsley
Publisher: name: University of British Columbia
Year: 2012

description: The visual cortex of the brain is one of the fundamental preparations to study critical periods and activity dependent changes in the brain. During development, when sensory input from one eye is prevented, visual acuity and brain connectivity is lost in favour of inputs from the active eye. Because of the brain’s complexity, it is difficult to perform thorough analyses of synaptic mechanisms that exist during development. Therefore, the development of simpler in vitro models would be advantageous. In our studies, we used a 3-compartment microfluidic device and created a new model for dual input in vitro activity dependent synaptic plasticity. Microfluidics offered the advantage of being able to physically and chemically isolate neurons in distinct environments. In chapter 2, we optimized previously developed microfluidic devices for use in our cell culture experiments and demonstrated that their application can create a dual input activity dependent system. Using a 3-compartment microfluidic device, the activity of one neuronal group was reduced by application of tetrodotoxin or the GABA agonist, muscimol. Treatment caused the formation of a greater number of synaptic contacts between the target ‘postsynaptic’ neurons and the ‘presynaptic’ inputs at normal working activity levels compared to the opposing ‘presynaptic’ inputs with reduced activity. In chapter 3, we established that ‘critical periods’ exist in our in vitro model by varying the ages at which we reduced neuronal input activity. Muscimol treatment had an earlier time window to induce activity dependent synaptic changes compared to inhibition by tetrodotoxin. By the fourth week in culture, neither treatment induced any synaptic difference between inputs. In chapter 4, we examined the mechanisms involved in our model. We manipulated NMDAR activity, CamKII activity, or GluR2 internalization postynaptically under the same conditions that we previously established. In our model, both treatments were NMDAR activity dependent while the requirement for CamKII activity and GluR2 internalization was dependent on the application of either muscimol or tetrodotoxin respectively. Taken together, we showed the ability to create a new in vitro model for activity dependent synaptic plasticity and that even in a simple system multiple mechanisms can exist.
Model-Driven Process Enactment for NFV Systems with MAPLE
Creators: name: Mustafiz, Sadaf
name: Hassane, Omar
name: Dupont, Guillaume
name: Khendek, Ferhat
name: Toeroe, Maria
Publisher: name: arXiv
Year: 2019
Subjects: subject: Software Engineering (cs.SE)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The Network Functions Virtualization (NFV) advent is making way for the rapid deployment of network services (NS) for telecoms. Automation of network service management is one of the main challenges currently faced by the NFV community. Explicitly defining a process for the design, deployment, and management of network services and automating it is therefore highly desirable and beneficial for NFV systems. The use of model-driven orchestration means has been advocated in this context. As part of this effort to support automated process execution, we propose a process enactment approach with NFV systems as the target application domain. Our process enactment approach is megamodel-based. An integrated process modelling and enactment environment, MAPLE, has been built into Papyrus for this purpose. Process modelling is carried out with UML activity diagrams. The enactment environment transforms the process model to a model transformation chain, and then orchestrates it with the use of megamodels. In this paper we present our approach and environment MAPLE, its recent extension with new features as well as application to an enriched case study consisting of NS design and onboarding process.
description: 27 pages, 14 figures, 1 table
Effects of Hurricane Maria on the Bat Community on the Caribbean Island of Dominica
Creators: name: Sims, Lisa Marie
Publisher: name: Arts
Year: 2022
Subjects: subject: post-hurricane
subject: disturbance
subject: tropical bats
subject: bat abundance
subject: Biology
subject: Ecology
subject: FOS: Biological sciences

description: In the Northern tropics, hurricanes can have detrimental effects on bat communities causing direct mortality and injury, and by altering the landscape and disrupting resource availability (i.e., food and roost sites). Islands are particularly vulnerable because they are isolated, closed systems. Therefore, with the predicted increase in frequency of major storms, understanding the response by bats in insular communities is vital. I examined the effects of Hurricane Maria on the bat community in Dominica. Maria was a category 5 storm that struck on 18 September 2017 causing substantial damage across the island. I measured changes in diversity and abundance for the entire bat community, and further examined effects on abundance, body condition and reproductive rate for the four most common species in three foraging guilds – Artibeus jamaicensis (frugivore), Monophyllus plethodon (nectarivore), Molossus molossus and Myotis dominicensis (insectivores). In general, Hurricane Maria had negative effects on the bat community. All guilds were negatively impacted but not all species, and frugivores showed the strongest negative responses. Maria negatively affected all the common species except M. molossus. Reduced abundance for common species, particularly frugivores (e.g., A. jamaicensis) resulted in a more even distribution and greater diversity post-Maria. The largest declines in abundance occurred in the frugivores, which I suggest was primarily due to loss of food and roosts. There was no change in body condition for any guild indicating that individuals that survived were able to obtain enough food. However, there was a significant decline in female reproductive rate for frugivores suggesting a trade-off between energy for survival and reproduction. A comprehensive understanding will require longer-term monitoring post-hurricane.
Lyapunov exponents and entanglement entropy transition on the noncommutative hyperbolic plane
Creators: name: Ganeshan, Sriram
name: Polychronakos, Alexios P.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study quantum dynamics on noncommutative spaces of negative curvature, focusing on the hyperbolic plane with spatial noncommutativity in the presence of a constant magnetic field. We show that the synergy of noncommutativity and the magnetic field tames the exponential divergence of operator growth caused by the negative curvature of the hyperbolic space. Their combined effect results in a first-order transition at a critical value of the magnetic field in which strong quantum effects subdue the exponential divergence for {\it all} energies, in stark contrast to the commutative case, where for high enough energies operator growth always diverge exponentially. This transition manifests in the entanglement entropy between the `left' and `right' Hilbert spaces of spatial degrees of freedom. In particular, the entanglement entropy in the lowest Landau level vanishes beyond the critical point. We further present a non-linear solvable bosonic model that realizes the underlying algebraic structure of the noncommutative hyperbolic plane with a magnetic field.
description: 24 pages, 4 figures