cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Soft cells and the geometry of seashells
Creators: name: Domokos, Gábor
name: Goriely, Alain
name: Horváth, Ákos G.
name: Regős, Krisztina
Publisher: name: arXiv
Year: 2024
Subjects: subject: Applied Physics (physics.app-ph)
subject: Metric Geometry (math.MG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 05B45 52C20 52C22

description: A central problem of geometry is the tiling of space with simple structures. The classical solutions, such as triangles, squares, and hexagons in the plane and cubes and other polyhedra in three-dimensional space are built with sharp corners and flat faces. However, many tilings in Nature are characterized by shapes with curved edges, non-flat faces, and few, if any, sharp corners. An important question is then to relate prototypical sharp tilings to softer natural shapes. Here, we solve this problem by introducing a new class of shapes, the \textit{soft cells}, minimizing the number of sharp corners and filling space as \emph{soft tilings}. We prove that an infinite class of polyhedral tilings can be smoothly deformed into soft tilings and we construct the soft versions of all Dirichlet-Voronoi cells associated with point lattices in two and three dimensions. Remarkably, these ideal soft shapes, born out of geometry, are found abundantly in nature, from cells to shells.
description: 18 pages, 7 figures
HST-ACS photometry of the isolated dwarf galaxy VV124=UGC4879. Detection of the Blue Horizontal Branch and identification of two young star clusters
Creators: name: Bellazzini, M.
name: Perina, S.
name: Galleti, S.
name: OOsterloo, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present deep V and I photometry of the isolated dwarf galaxy VV124=UGC4879, obtained from archival images taken with the Hubble Space Telescope - Advanced Camera for Surveys. In the color-magnitude diagrams of stars at distances larger than 40" from the center of the galaxy, we clearly identify for the first time a well-populated old Horizontal Branch (HB). We show that the distribution of these stars is more extended than that of Red Clump stars. This implies that very old and metal poor populations becomes more and more dominant in the outskirts of VV124. We also identify a massive (M~1.2X10^4 M_sun) young (age ~250 Myr) star cluster (C1), as well as another of younger age (C2, <= 30 Myr) with a mass similar to classical open clusters (M<= 3.3X10^3 M_sun). Both clusters lie at projected distances smaller than 100 pc from the center of the galaxy.
description: Accepted for publication by Astronomy & Astrophysics. 11 pages, 10 color figures. Four figures are provided in low resolution version. Full resolution pdf version of the paper is available at this site: http://www.bo.astro.it/SGR/VV124_ACS.pdf
A strategic approach to municipal economic development: a case study of the Municipal District of Big Lakes, Alberta
Creators: name: Gauci, Joanne
Publisher: name: Environmental Design
Year: 2004

description: Bibliography: p. 183-192
description: Some pages are in colour.
description: This Master's Degree Project applies a strategic approach to municipal economic development in a rural Municipal District in Northern Alberta. It explores the distinct challenges facing rural communities in the current economic climate, and reviews past and current approaches to economic development in rural settings. It places an emphasis on the roles of local governments, strategic planning, and collaboration in successful local economic development, and attempts to develop practical short-term to mid-term solutions that will enable the local government to better position itself for economic development. A proactive and strategic approach based on key informant interviews and data analysis is employed. Objectives include: researching best practices; undertaking a local economic assessment (with an emphasis on understanding the role of key regional sectors); undertaking economic development opportunity identification; and providing recommendations on how the local government can facilitate long-term economic development. Findings reveal the need to continue down the path of further economic diversification and job creation. The study assumes that it is imperative for the emerging innovation and competitiveness agenda to extend beyond high technology industries to Canada's traditional industries, such as forestry and agriculture. Furthermore, the report concludes that it will not be one major economic opportunity but a combination of many small and varied economic opportunities that has the potential to improve the long-term economic base of the region. Recommendations are aimed at fostering local business growth, developing organizational capacity, undertaking marketing and promotion, and fostering partnership building with neighbouring local government. A variety of strategies for implementation are identified, ranging from modest initiatives, such as implementing a benchmarking framework and establishing a "one-stop shopping" information area, to joining a regional alliance and creating an economic development body or position.
A tale of chert with a side of shell: the preceramic occupation of Antigua, West Indies
Creators: name: De Mille, Christy Nicole
Publisher: name: University of Calgary
Year: 2005

description: Bibliography: p. 367-388
description: Alone of the Lesser Antillean islands, Antigua has a rich Preceramic archaeological record. The goal of this dissertation has been to develop our understanding of the Antiguan Preceramic through the synthesis and interpretation of available data. The data for this dissertation came from two main sources. The first is from excavations undertaken at the site of North Crabb's Bay. The second is a dataset collected by researcher Bruce Nodine. Site location on the island is heavily biased toward the northeastern coastline that offers the best marine resources and the closest access to the main chert source. Investigation of the Preceramic subsistence remains from Antigua reveals a pattern reproduced in many of the other Preceramic sites in the Lesser Antilles. Data from Antigua confirm previous models of a marine oriented subsistence strategy focussed on shellfish. A consistently observed pattern is a high degree of species selectivity displayed in the assemblages. It is suggested that little resource stress allowed these people to be highly selective. There is a long-term pattern of living well on the island and on other neighbouring islands as well. Antigua has abundant evidence of large blade production, rare outside of the Greater Antilles. Technological analysis undertaken here indicated a regularised and consistently patterned method of producing large percussion blades. A distinctive core maintenance flake appears characteristic of Preceramic blade production. The structured lithic production is not found in the tool assemblage. Generally, the expedient nature of the identified tools indicates a strategy of tool selection/use based on usable edges, as opposed to retouch toward a specific form. The correlation of the presence of blade production in areas like Antigua and the Greater Antilles that have the raw material to support such an industry is too perfect to be coincidental. It is possible that blade technology was part of the overall Preceramic cultural repertoire and was practiced in regions that had the raw material to support blade production. The lithic technological analysis presented here forms the basis upon which future work, as well as comparisons with other islands, can be attempted.
A computational model of the rolling coin using the pseudo-rigid body theory
Creators: name: Defaz-Silva, Rommel Ivan
Publisher: name: University of Calgary
Year: 2004

description: Bibliography: p. 79-80
description: Includes 1 CD
description: One of the classical problems of Rigid-Body mechanics is that of a coin rolling without sliding on a horizontal plane. The non-sliding condition gives rise to a so-called non-holonomic constraint, namely, a non-integrable differential form that places a restriction on the instantaneous velocity of the system. One of the intriguing challenges of the rolling coin problem is that of explaining the noise produced by the fast wobbling of a rotating dish on a table as it slowly approaches the final horizontal position of rest. It has been suggested that this phenomenon results from the coupling between the overall rigid body motion and the small elastic vibrations of the plate. To introduce this aspect into the formulation, we suggest the use of the Theory of Pseudo-Rigid Bodies, whereby a partial deformability of the coin is introduced by assuming that it can undergo homogeneous deformations only, that is, that the strain is uniform throughout the coin. In this study, however, only in-plane vibrations of the coin are considered, leaving the important issue of transverse vibrations for future development. The shape of the deformed coin is an ellipse whose eccentricity and orientation keeps changing in time. As a result, the dynamical system is still a classical one governed by ordinary, rather than partial, differential equations. Using the principles of Lagrangian Mechanics, the equations of motion of the system are formulated and solved numerically for different initial conditions. The solutions clearly show the coupling of the rolling with the deformation.
Pararhodacarus Jordaan, Loots & Theron 1988
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Pararhodacarus

description: Genus Pararhodacarus Jordaan, Loots & Theron, 1988
 Pararhodacarus Jordaan, Loots & Theron, 1988: 275 (described in Rhodacaridae Oudemans).
 Type species: Pararhodacarus intermedius Jordaan, Loots & Theron, 1988, by original designation.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 36
Image processing algorithms for three-dimensional segmentation of the tumor mass in computed tomographic images of neuroblastoma
Creators: name: Deglint, Hanford John
Publisher: name: University of Calgary
Year: 2004

description: Bibliography: p. 96-105
description: Some pages are in colour.
description: Tumor definition and diagnosis require the analysis of the spatial distribution and Hounsfield unit (HU) values of voxels in computed tomography (CT) images, coupled with a knowledge of normal anatomy. Segmentation of the tumor in neuroblastoma is complicated by the fact that the mass is almost always heterogeneous in nature; furthermore, viable tumor, necrosis, fibrosis, and normal tissue are often intermixed. This study has developed strategies to improve tumor segmentation. In this scheme, the normal structures expected in abdominal CT images are delineated and removed from further consideration; the remaining parts of the image volume are then examined for the tumor mass. Mathematical morphology, fuzzy connectivity, and other image processing tools are deployed for this purpose. Expert knowledge provided by the radiologist in the form of the expected structures and their shapes, HU values, and radiological characteristics are also incorporated into the segmentation algorithm. Segmentation and analysis of the tissue composition of the tumor can assist in quantitative assessment of the response to chemotherapy and in the planning of delayed surgery for resection of the tumor. The performance of the algorithm is evaluated using cases acquired from the Alberta Children's Hospital.
Pennarhodeus Karg 2000
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Pennarhodeus

description: Genus Pennarhodeus Karg, 2000
 Pennarhodeus Karg, 2000a: 255 (described in Rhodacaridae Oudemans).
 Pennarhodeus.— Castilho, Moraes & Halliday, 2012: 5.
 Type species: Pennarhodeus pennatus Karg, 2000, by original designation.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 36
Genetic regulation of chemotaxis and motility in Rhizobium leguminosarum
Creators: name: Del Bel, Kathryn L.
Publisher: name: University of Calgary
Year: 2004

description: Bibliography: p. 134-142
description: Some pages are in colour.
description: Rhizobium leguminosarum, a nitrogen-fixing root nodule bacterium, has over 20 genes coding MCP-type chemoreceptors, which could playa role in locating host legumes by chemotaxis. Transcriptional gusA fusions were made with the mcpC and mcpD genes, and were used to confirm that the mcp genes are down-regulated in the nodule. Transposon mutagenesis was completed with a mcpC fusion strain to identify possible genes which regulate mcp expression. A free-living mcp regulatory mutant was identified as a bacA mutation, while two mutants which showed less down-regulation in nodules than the wild-type were identified as hutC and a ribitiol transporter mutant. Changes in expression in these mutants in planta were confirmed by examining nodules histologically. The flagellin proteins from a R. leguminosarum strain were isolated and used to produce an anti-flagellar antibody. Immunoblots employing this antibody confirmed that flagella, like MCPs, are down-regulated in nodule bacteria.
Magnetic resonance from the interplay of frustration and superconductivity
Creators: name: Knolle, J.
name: Eremin, I.
name: Schmalian, J.
name: Moessner, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by the iron-based superconductors, we develop a self-consistent electronic theory for the itinerant spin excitations in the regime of coexistence of the antiferromagnetic stripe order with wavevector ${\bf Q}_{1} = (π,0)$ and $s^{+-}$ superconductivity. The onset of superconductivity leads to the appearance of a {\em magnetic} resonance near the wavevector ${\bf Q}_{2} = (0,π)$ where magnetic order is absent. This resonance is isotropic in spin space, unlike the excitations near ${\bf Q}_{1}$ where the magnetic Goldstone mode resides. We discuss several features which can be observed experimentally.
description: 5 pages, 3 figures
Operating conditions and thermodynamic bounds of dual radiative heat engines
Creators: name: Legendre, Julien
name: Chapuis, Pierre-Olivier
Publisher: name: arXiv
Year: 2024
Subjects: subject: Applied Physics (physics.app-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We propose a unified description of dual radiative heat engines (RHEs), consisting of two facing optoelectronic components (diodes) and capable of generating electrical power from heat. They can operate in three regimes depending on the applied biases, namely in thermoradiative-negative electroluminescent (TRNEL), thermoradiative-photovoltaic (TRPV) or thermophotonic regimes (TPX, consisting of a light-emitting diode and a PV cell). They have access to operating conditions that are unachievable by single RHEs such as thermophotovoltaic systems: at the radiative limit, TRNEL devices can reach the Carnot efficiency for any bandgap, while TPX devices achieve large power outputs by means of electroluminescent enhancement. Expressions of the maximum power output and related efficiency achieved by dual engines are derived analytically, and reveal that the power output of TPX engines is not bounded. A comparison to usual efficiency bounds also highlights the impact of thermalisation losses, and the subsequent interest of spectral filtering to extend the operating region. The influence of nonradiative recombinations is also investigated. This work provides common framework and guidelines for the study of RHEs, which represent a promising solution for reliable and scalable energy conversion.
Non-linear transport phenomena in a two-subband system
Creators: name: Wiedmann, S.
name: Gusev, G. M.
name: Raichev, O. E.
name: Bakarov, A. K.
name: Portal, J. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study non-linear transport phenomena in a high-mobility bilayer system with two closely spaced populated electronic subbands in a perpendicular magnetic field. For a moderate direct current excitation, we observe zero-differential-resistance states with a characteristic 1/B periodicity. We investigate, both experimentally and theoretically, the Hall field-induced resistance oscillations which modulate the high-frequency magneto-intersubband oscillations in our system if we increase the current. We also observe and describe the influence of direct current on the magnetoresistance in the presence of microwave irradiation.
description: 8 pages, 6 figures
Top polarisation studies in $H^-t$ and $Wt$ production
Creators: name: Godbole, Rohini M.
name: Hartgring, Lisa
name: Niessen, Irene
name: White, Chris D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The polarisation of top quarks produced in high energy processes can be a very sensitive probe of physics beyond the Standard Model. The kinematical distributions of the decay products of the top quark can provide clean information on the polarisation of the produced top and thus can probe new physics effects in the top quark sector. We study some of the recently proposed polarisation observables involving the decay products of the top quark in the context of $H^-t$ and $Wt$ production. We show that the effect of the top polarisation on the decay lepton azimuthal angle distribution, studied recently for these processes at leading order in QCD, is robust with respect to the inclusion of next-to-leading order and parton shower corrections. We also consider the leptonic polar angle, as well as recently proposed energy-related distributions of the top decay products. We construct asymmetry parameters from these observables, which can be used to distinguish the new physics signal from the $Wt$ background and discriminate between different values of $\tanβ$ and $m_{H^-}$ in a general type II two-Higgs doublet model. Finally, we show that similar observables may be useful in separating a Standard Model $Wt$ signal from the much larger QCD induced top pair production background.
description: 33 pages, 35 figures, references added
The RKSTAR Concert: A RECONS Survey of the 5000 Nearest K Dwarfs
Creators: name: Henry, Todd J.
name: Casetti-Dinescu, Dana I.
name: Horch, Elliott P.
name: Hubbard-James, Hodari-Sadiki
name: Jao, Wei-Chun
name: Lesley, D. Xavier
name: Paredes, Leonardo A.
name: Shea, Melissa A.
name: Sutherland, Torrie P.
name: RECONS Team
Publisher: name: Zenodo
Year: 2022
Subjects: K dwarfs
multiple stars
radial velocity
speckle interferometry
astrometry

description: The RKSTAR (RECONS K Stars) Project targets the 5000 nearest K dwarfs, all within 50 parsecs of the Sun. This is a critical sample for astrophysical studies and exoplanet searches, addressing science questions from the star formation history in the Milky Way to potential locations for life-bearing worlds. To paint a complete portrait of the sample, RECONS (REsearch Consortium On Nearby Stars, www.recons.org) is conducting four systematic surveys of these K dwarfs. Characterization Survey ⏤ utilizes the CHIRON high-resolution spectrograph on the SMARTS 1.5m at CTIO. The spectra provide accurate temperatures, metallicities, and measurements of activity indices that are used to estimate ages. Wide Field Survey ⏤ targets stellar companions at separations larger than ~1 arcsecond, revealed using Gaia results and cataloged companions from the Washington Double Stars Catalog. Nearly 500 stellar companions, ~80 of which are new discoveries, have been identified out to ~4000AU. Speckle Survey ⏤ reveals stellar companions from 0.5-100 AU using speckle cameras on 4 to 8m class telescopes. More than 160 stellar companions, ~90 of which are new discoveries, have been found so far, and most orbit within 15 AU of the K dwarfs. Radial Velocity Survey ⏤ utilizes CHIRON on the SMARTS 1.5m to reveal stars, brown dwarfs, and jovian exoplanets orbiting the K dwarfs within 3 AU. Dozens of stellar companions and several new planets have already been discovered. The four surveys will provide an unprecedented dataset describing the characteristics and  companions to the stars that make up 12% of all stars in the solar neighborhood.
description: {"references": ["Hubbard-James, H.S. et al. (2022), AJ, 164, 174", "Paredes, L.A. et al. (2021), AJ, 162, 176"]}
Poropodalius Karg 2000
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Poropodalius

description: Genus Poropodalius Karg, 2000
 Poropodalius Karg, 2000a: 252 (described in Rhodacaridae Oudemans).
 Poropodalius.— Karg & Schorlemmer, 2009: 66; Castilho, Moraes & Halliday, 2012: 14.
 Type species: Poropodalius hexapennatus Karg, 2000, by original designation.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 37
Quasicondensation reexamined
Creators: name: Bienias, Przemyslaw
name: Pawlowski, Krzysztof
name: Gajda, Mariusz
name: Rzazewski, Kazimierz
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study in detail the effect of quasicondensation. We show that this effect is strictly related to dimensionality of the system. It is present in one dimensional systems independently of interactions - exists in repulsive, attractive or in non-interacting Bose gas in some range of temperatures below characteristic temperature of the quantum degeneracy. Based on this observation we analyze the quasicondensation in terms of a ratio of the two largest eigenvalues of the single particle density matrix for the ideal gas. We show that in the thermodynamic limit in higher dimensions the second largest eigenvalue vanishes (as compared to the first one) with total number of particles as $\simeq N^{-γ}$ whereas goes to zero only logarithmically in one dimension. We also study the effect of quasicondensation for various geometries of the system: from quasi-1D elongated one, through spherically symmetric 3D case to quasi-2D pancake-like geometry.
Protein sequence and structure: Is one more fundamental than the other?
Creators: name: Banavar, Jayanth R.
name: Hoang, Trinh X.
name: Seno, Flavio
name: Trovato, Antonio
name: Maritan, Amos
Publisher: name: arXiv
Year: 2012
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We argue that protein native state structures reside in a novel "phase" of matter which confers on proteins their many amazing characteristics. This phase arises from the common features of all globular proteins and is characterized by a sequence-independent free energy landscape with relatively few low energy minima with funnel-like character. The choice of a sequence that fits well into one of these predetermined structures facilitates rapid and cooperative folding. Our model calculations show that this novel phase facilitates the formation of an efficient route for sequence design starting from random peptides.
description: 7 pages, 4 figures, to appear in J. Stat. Phys
Poropodalius acutus Karg 2000
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Poropodalius
Poropodalius acutus

description: 83. Poropodalius acutus Karg, 2000
 Poropodalius acutus Karg, 2000a: 253.
 Poropodalius acutus.— Karg & Schorlemmer, 2009: 67; Castilho, Moraes & Halliday, 2012: 15.
TYPE DEPOSITORY: Arachnologische Sammlung des Museums für Naturkunde, Berlin, Germany.
TYPE LOCALITY AND HABITAT: Cuba, Sierra Esperon, 1977, in soil.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 37
Study of interference effects on GPS signal acquisition
Creators: name: Deshpande, Sameet Mangesh
Publisher: name: University of Calgary
Year: 2004

description: Bibliography: p. 193-204
description: Interference and jamming is one of the major concerns in using the Global Positioning System (GPS) for critical applications. The GPS system has advantages over the narrow-band navigation systems since GPS signals are spread-spectrum signals and receiver design techniques can eliminate most of the interference signals. Any signal or its harmonics near the GPS L1 and L2 frequencies are a potential source of interference. The interference signals outside GPS frequency band can be filtered out either by a GPS antenna or a receiver front-end. Interference signals within the GPS frequency bandwidth are difficult to isolate using the filters. These signals need to be mitigated either by the acquisition process or the tracking process. This thesis investigates possible interference mitigation by the acquisition process. Acquisition methods were implemented as a part of the correlator in a software receiver and used for analysis. Interference resulting from sampling in the receiver front-end and cross-correlation between the GPS Gold codes were studied. Aliasing effect introduces a loss of 2-3 dB in the acquisition gain and causes false locks for smaller sampling frequencies at a wider precorrelation bandwidth. The cross-correlation between the GPS Gold codes causes problems for the signal acquisition below -135 dBm. Different radio frequency (RF) interference signals were studied to analyze their effect on the acquisition process. Adaptive predetection integration (up to 100 ms) was performed to determine the possible tolerance to the RF interference signals. A continuous wave (CW) interference hinders the acquisition more compared to any other RF signals such as swept CW, amplitude modulated (AM), frequency modulated (FM) or broadband noise. An RF signal level of 15-25 dB above the GPS signal level was found sufficient to jam the acquisition process.
Criticality and the Onset of Ordering in the Standard Vicsek Model
Creators: name: Baglietto, Gabriel
name: Albano, Ezequiel V.
name: Candia, Julián
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Experimental observations of animal collective behavior have shown stunning evidence for the emergence of large-scale cooperative phenomena resembling phase transitions in physical systems. Indeed, quantitative studies have found scale-free correlations and critical behavior consistent with the occurrence of continuous, second-order phase transitions. The Standard Vicsek Model (SVM), a minimal model of self-propelled particles in which their tendency to align with each other competes with perturbations controlled by a noise term, appears to capture the essential ingredients of critical flocking phenomena. In this paper, we review recent finite-size scaling and dynamical studies of the SVM, which present a full characterization of the continuous phase transition through dynamical and critical exponents. We also present a complex network analysis of SVM flocks and discuss the onset of ordering in connection with XY-like spin models.
description: 15 pages, 4 figures. To appear in Interface Focus
MPEC 2023-H59 : 2023 GD3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 GD3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
SDW transition of Fe1 zigzag chains and metamagnetic transition of Fe2 in TaFe$_{1+y}$Te$_3$
Creators: name: Liu, R. H.
name: Zhang, M.
name: Cheng, P.
name: Yan, Y. J.
name: Xiang, Z. J.
name: Ying, J. J.
name: Wang, X. F.
name: Wang, A. F.
name: Ye, G. J.
name: Luo, X. G.
name: Chen, X. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We systematically study the AFM order of Fe1 zigzag chains and spin-flop of excess Fe2 under high magnetic field H through the susceptibility, magnetoresistance (MR), Hall effect and specific heat measurements in high-quality single crystal TaFe$_{1+y}$Te$_3$. These properties suggest that the high temperature AFM transition of the TaFeTe$_3$ layers should be a SDW-type AFM order. Below T$_N$, Fe1 antiferromangetic zigzag chains will induce a inner magnetic field \textbf{H$_{int}$} to interstitial Fe2 and lead Fe2 also forms an AFM alignment, in which the magnetic coupling strength between Fe1 and Fe2 is enhanced by decreasing temperature. On the other hand, the external magnetic field \textbf{H$_{ext}$} inclines to tune interstitial Fe2 to form FM alignment along \textbf{H$_{ext}$}. When \textbf{H$_{ext}$} arrives at the "coercive" field H$_C$, which is able to break the coupling between Fe1 and Fe2, these interstitial Fe2 atoms take a spin-flop from AFM to FM alignment. The local moment of Fe2 is about 4 $μ_{\textrm{B}}$/Fe. From low field ($$H$_C$) FM for Fe2, it also induces sharp drop on resistivity and an anomalous Hall effect. The possible magnetic structure of TaFe$_{1+y}$Te$_3$ is proposed from the susceptibility and MR. The properties related to the spin-flop of Fe2 supply a good opportunity to study the coupling between Fe1 and Fe2 in these TaFe$_{1+y}$Te$_3$ or Fe$_{1+y}$Te with interstitial Fe2 compounds.
description: 8 pages, 8 figures, submitted to Phys. Rev. B
Embracing the dark: planning for nightlife in the beltline
Creators: name: Dickout, Dustin
Publisher: name: Environmental Design
Year: 2004

description: Bibliography: p. 83-89
description: Some pages are in colour.
description: This MDP is an ethnographic study about urban nightlife with liquor establishments as the focus. The project's nature is conceptual and abstract with few existing conventional precedents to draw upon. In addition, the methodology employed is largely based on participatory and first person experiences. Nightlife, in the form of bars and nightclubs, is a valuable component of city life not only because it evokes pleasurable sensations among its participants but also because it re-enforces a city's cosmopolitan edge. However, enforced policies and regulations often mediate and dilute these experiences. This inherent tension creates 'experiential gaps' between the participants in terms of communication, language, and policy deficiencies. These gaps make nightlife planning difficult; what constitutes appropriate planning procedure is unclear. In Calgary, nightlife is planned for only after successive problems arise which cannot be ignored any longer. This approach is reactive and re-enforces nightlife's image, as more of a nuisance than a benefit. The Beltline, the neighbourhood south of Calgary's downtown core, is the study area. Nightlife planning should be included in the Beltline's development plans in order to create diverse and vibrant 'live-work-play' inner-city environments. Research for this project is built on the theory and principles of 2nd Generation CPTED (Crime Prevention Through Environmental Design). This serves as an appropriate planning model through its capacity to include all affected participants, promote open and equitable dialogue, and uphold the notions of mutual respect and trust. Two case studies -Street SW (Radio Block) in Calgary and Vancouver's Comprehensive Hours of Service Policy -investigate nightlife's impacts on the urban landscape. In order to gain primary insight about the nightlife question, a number of key informant interviews were conducted with involved participants. Recommendations suggest measures which could encourage open dialogue between participants and clarify the present ambiguity clouding nightlife planning. KEYWORDS -Nightlife, The Beltline, Liminal(ity), 2nd Generation CPTED, Dynamic Facilitation, Experience, Safety
Hadronic gamma-ray images of Sedov supernova remnants
Creators: name: Beshley, V.
name: Petruk, O.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A number of modern experiments in high-energy astrophysics produce images of supernova remnants (SNRs) in the TeV and GeV gamma-rays. Either relativistic electrons (due to the inverse-Compton scattering) or protons (due to the pion decays) may be responsible for this emission. In particular, the broad-band spectra of SNRs may be explained in both leptonic and hadronic scenarios. Another kind of observational data, namely, images of SNRs, is an important part of experimental information. We present a method to model gamma-ray images of Sedov SNRs in uniform media and magnetic field due to hadronic emission. These gamma-rays are assumed to appear as a consequence of meson decays produced in inelastic collisions of accelerated protons with thermal protons downstream of the shock - a model would be relevant for SNRs without firm confirmations of the shock-cloud interaction, as e.g. SN1006. Distribution of surface brightness of the shell-like SNR is synthesized numerically for a number of configurations. An approximate analytical formula for azimuthal and radial variation of hadronic gamma-ray brightness close to the shock is derived. The properties of images as well as the main factors determining the surface brightness distribution are determined. Some conclusions which would be relevant to SN1006 are discussed.
description: 11 pages, 7 figures, to be published in MNRAS
Protogamasellopsis dioscorus
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Protogamasellopsis
Protogamasellopsis dioscorus

description: 89. Protogamasellopsis dioscorus (Manson, 1972)
 Protogamasellus dioscorus Manson, 1972: 437.
 Protogamasellopsis dioscorus.— Evans & Purvis, 1987: 855; Karg, 1994a: 123; Karg, 1994b: 208; Karg, 2007: 124; Castilho & Moraes, 2010: 397.
TYPE DEPOSITORY: Collection of the Department of Agriculture, Levin, New Zealand.
TYPE LOCALITY AND HABITAT: New Zealand, Auckland International Airport, 19 June 1969, intercepted on yam [Dioscoreaceae] from Tonga.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 38
An Analysis of the First Order Form of Gauge Theories
Creators: name: Kiriushcheva, N.
name: Kuzmin, S. V.
name: McKeon, D. G. C.
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 first order form of a Maxwell theory and U(1) gauge theory in which a gauge invariant mass term appears is analyzed using the Dirac procedure. The form of the gauge transformation which leaves the action invariant is derived from the constraints present. A non-Abelian generalization is similarly analyzed. This first order three dimensional massive gauge theory is rewritten in terms of two interacting vector fields. The constraint structure when using light-cone coordinates is considered. The relationship between first and second order forms of the two-dimensional Einstein-Hilbert action is explored where a Lagrange multiplier is used to ensure their equivalence.
description: 22 pages, to appear in Canadian Journal of Physics. arXiv admin note: text overlap with arXiv:hep-th/0609220
Chiral Interaction Induced Near-Perfect Photon Blockade
Creators: name: Lu, Zhi-Guang
name: Wu, Ying
name: Lü, Xin-You
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Based on the scattering matrix method, we theoretically demonstrate that the chiral interaction can induce the almost perfect photon blockade (PB) in the waveguide-cavity quantum electrodynamics (QED) system. The mechanism relies on the multi-photon paths interference within the waveguide, which is clearly shown by the analytic parameter regime for $g^{(2)}(0)\approx0$. When $N$ cavities are introduced into the system, there are $N$ optimal parameter points accordingly for the almost perfect PB, where the required lowest chirality decreases exponentially with increasing $N$, and these optimal points are robust against disorder in the system's frequencies. Under resonant driving and fixed chirality conditions, the output light depends solely on the parity of $N$ ($N\ge2$), with a coherent state emerging for even numbers of cavities and a single-photon state for odd numbers. Our work offers an alternative route for achieving almost perfect PB effects with high single-photon transmission by employing the chirality of system, with potential application in the on-chip single-photon source with integrability.
description: 7 + 23 pages, 4 + 10 figures. Published version
On Amplification by Weak Measurement
Creators: name: Koike, Tatsuhiko
name: Tanaka, Saki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the amplification by the Aharonov-Albert-Vaidman weak quantum measurement on a Sagnac interferometer [P. B. Dixon et al., Phys. Rev. Lett. 102, 173601 (2009)] up to all orders of the coupling strength between the measured system and the measuring device. The amplifier transforms a small tilt of a mirror into a large transverse displacement of the laser beam. The conventional analysis has shown that the measured value is proportional to the weak value, so that the amplification can be made arbitrarily large in the cost of decreasing output laser intensity. It is shown that the measured displacement and the amplification factor are in fact not proportional to the weak value and rather vanish in the limit of infinitesimal output intensity. We derive the optimal overlap of the pre- and post-selected states with which the amplification become maximum. We also show that the nonlinear effects begin to arise in the performed experiments so that any improvements in the experiment, typically with an amplification greater than 100, should require the nonlinear theory in translating the observed value to the original displacement.
Novel role of integrin ligands in neuromodulation
Creators: name: Diep, Chi Que
Publisher: name: University of Calgary
Year: 2004

description: Bibliography: p. 95-107
description: Integrins, a family of cell adhesion receptors, and their ligands, the extracellular matrix proteins, have been implicated as neuromodulators in the adult CNS. Previous studies from our laboratory on neurons isolated from the CNS of the gastropod snail Lymnaea stagnalis show that integrin peptides increase HVA Ca2+ concentrations and other active intrinsic membrane properties. The current study extends this line of investigation to the intact CNS. Extracellular electrophysiological recording from the trunk of one of the nerves (right internal parietal or RIP nerve) originating from the Lymnaea CNS shows that integrin peptide with the consensus integrin binding motif RDG increases the electrical discharge of some projecting neurons. Further investigations, involving the intracellular recording from 2 synaptic partners that have axonal projections in the RIP nerve, provide evidence that in the Lymnaea CNS integrins play a role in synaptic modulation since they modulate the kinetics of the postsynaptic potentials through synaptic remodeling.
Protogamasellopsis granulosus Karg 1994
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Protogamasellopsis
Protogamasellopsis granulosus

description: 90. Protogamasellopsis granulosus Karg, 1994
 Protogamasellopsis granulosus Karg, 1994b: 208.
 Protogamasellopsis granulosus.— Karg, 2007: 124.
TYPE DEPOSITORY: Arachnologische Sammlung des Museums für Naturkunde, Berlin, Germany.
TYPE LOCALITY AND HABITAT: Galapagos Islands, Cueva Bella Vista, Bella Vista, Santa Cruz, 15–25 May 1985, in trap with manure.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 38
Improved Variable Star Search in Large Photometric Data Sets -- New Variables in CoRoT Field LRa02 Detected by BEST II
Creators: name: Fruth, T.
name: Kabath, P.
name: Cabrera, J.
name: Chini, R.
name: Csizmadia, Sz.
name: Eigmüller, P.
name: Erikson, A.
name: Kirste, S.
name: Lemke, R.
name: Murphy, M.
name: Pasternacki, T.
name: Rauer, H.
name: Titz-Weider, R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The CoRoT field LRa02 has been observed with the Berlin Exoplanet Search Telescope II (BEST II) during the southern summer 2007/2008. A first analysis of stellar variability led to the publication of 345 newly discovered variable stars. Now, a deeper analysis of this data set was used to optimize the variability search procedure. Several methods and parameters have been tested in order to improve the selection process compared to the widely used J index for variability ranking. This paper describes an empirical approach to treat systematic trends in photometric data based upon the analysis of variance statistics that can significantly decrease the rate of false detections. Finally, the process of reanalysis and method improvement has virtually doubled the number of variable stars compared to the first analysis by Kabath et al. A supplementary catalog of 272 previously unknown periodic variables plus 52 stars with suspected variability is presented. Improved ephemerides are given for 19 known variables in the field. In addition, the BEST II results are compared with CoRoT data and its automatic variability classification.
description: 16 pages, 15 figures; figure set, machine-readable and VO tables available in the electronic edition of the Astronomical Journal
Slowed gastrointestinal transit is associated with an altered caecal microbiota in an aged rat model
Creators: name: Parkar, Nabil
name: Dalziel, Julie
name: J. Spencer, Nick
name: Janssen, Patrick
name: McNabb, Warren
name: Young, Wayne
Publisher: name: AgResearch
Year: 2023
Subjects: subject: Biological sciences
subject: FOS: Biological sciences

description: This study explores how slowed gastrointestinal transit (constipation) induced by the opioid agonist loperamide (imodium) alters the microbiota composition such that the richness and diversity of the bacterial communities is lowered. Notably Bacteroides were relatively abundant in the loperamide treated group suggesting that slowed colonic transit facilitates the amplification and colonization of genera such as Bacteroides that adapt well in slow moving and competitive environments with limited resources.
The function and mechanisms of alarm calls, lost calls and close contact calls in the white-faced capuchin (Cebus capucinus)
Creators: name: Digweed, Shannon Marie
Publisher: name: University of Calgary
Year: 2004

description: Bibliography: p. 116-124
description: The goal of animal communication research is often to identify the meaning and function of vocal signals. My analysis of white-faced capuchin alarm calls suggests two different types, "aerial" and "terrestrial", however, it does not provide support for any one traditional hypothesis (motivational, referential, affect-induction). Instead it suggests an integration of hypotheses; motivationally based calls allow functionally distinct responses via effects on listener attention. Analysis of lost calls suggests they provide cues to location and individual identity, facilitating antiphonal responses from receivers, which then provide mutual benefits. Finally, my analysis of close contact "huh" calls suggest, due to cues to identity and call frequency in close proximity situations, that calls facilitate within-group spacing. Overall, my research provides an integration of theoretical concepts, through analysis of the mechanisms and function of capuchin alarm calls. Additionally, analysis of lost and "huh" calls provides a better understanding of the white-faced capuchin vocal repertoire.
Rhodacarellus Willmann 1935
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Rhodacarellus

description: Genus Rhodacarellus Willmann, 1935
 Rhodacarellus Willmann, 1935: 429 (described in Rhodacaridae Oudemans).
 Rhodacarellus.— Evans, 1957: 221; Sheals, 1958: 302; Lee, 1970: 36; Karg, 1971: 323; Bregetova & Shcherbak, 1977b: 272; Evans & Till, 1979: 206; Shcherbak, 1980: 76; Fouly, 1992: 436; Karg, 1993: 336.
 Type species: Rhodacarellus subterraneus Willmann, 1935, by original designation.
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 39
Direct evidence for the magnetic ordering of Nd ions in NdMn$_2$Si$_2$ and NdMn$_2$Ge$_2$ by high resolution inelastic neutron scattering
Creators: name: Chatterji, T.
name: Combet, J.
name: Frick, B.
name: Szyula, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have investigated the low energy nuclear spin excitations in NdMn$_2$Si$_2$ and NdMn$_2$Ge$_2$ by high resolution inelastic neutron scattering. Previous neutron diffraction investigations gave ambiguous results about Nd magnetic ordering at low temperatures. The present element-specific technique gave direct evidence for the magnetic ordering of Nd ions. We found considerable difference in the process of the Nd magnetic ordering at low temperature in NdMn$_2$Si$_2$ and NdMn$_2$Ge$_2$. Our results are consistent with those of magnetization and recent neutron diffraction measurements.
Rhodacarellus arcanus
Creators: name: Castilho, Raphael C.
name: De Moraes, Gilberto J.
name: Halliday, Bruce
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Rhodacaridae
Rhodacarellus
Rhodacarellus arcanus

description: 96. Rhodacarellus arcanus (Athias-Henriot, 1961)
 Rhodacaropsis arcanus Athias-Henriot, 1961: 497.
 Rhodacarellus arcanus.— Loots, 1969a: 47; Lee, 1970: 37; Bregetova & Shcherbak, 1977b: 276; Shcherbak, 1980: 91; Shcherbak, 1982: 63.
TYPE DEPOSITORY: Laboratoire d’Acarologie de l’École Pratique des Hautes Études, Paris, France.
 TYPE LOCALITY AND HABITAT: Algeria, l'Oued Bouzaréah, 3 January 1961, in soil under Laurus nobilis [Lauraceae].
description: Published as part of Castilho, Raphael C., De Moraes, Gilberto J. & Halliday, Bruce, 2012, 3471, pp. 1-69 in Zootaxa 3471 on page 39