cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Impurity and quaternions in nonrelativistic scattering from a quantum memory
Creators: name: Margetis, Dionisios
name: Grillakis, Manoussos G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81Q05; 81U15

description: Models of quantum computing rely on transformations of the states of a quantum memory. We study mathematical aspects of a model proposed by Wu in which the memory state is changed via the scattering of incoming particles. This operation causes the memory content to deviate from a pure state, i.e. induces impurity. For nonrelativistic particles scattered from a two-state memory and sufficiently general interaction potentials in 1+1 dimensions, we express impurity in terms of quaternionic commutators. In this context, pure memory states correspond to null hyperbolic quaternions. In the case with point interactions, the scattering process amounts to appropriate rotations of quaternions in the frequency domain. Our work complements a previous analysis by Margetis and Myers (2006 J. Phys. A 39 11567--11581).
description: 16 pages, no figures
Callichlamys Miq.
Creators: name: Pace, Marcelo R.
name: Marcati, Carmen R.
name: Lohmann, Lúcia G.
name: Angyalossy, Veronica
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Bignoniaceae
Callichlamys

description: XI. Callichamys clade
TAXONOMIC INFORMATION. — This clade contains a single genus, Callichlamys Miq., with four phloem wedges in transversal section.
TOTAL NUMBER OF SPECIES IN THIS CLADE. — One species (Lohmann & Taylor 2014).
STUDIED SPECIES. — One, Callichlamys latifolia (Rich.) K.Schum.
Regular phloem
Thin fiber bands, assemblages present.
Variant phloem
General configuration. Non-fibrous (Fig. 13E), with approximately 9-18 rows of sieve tubes and phloem parenchyma cells between fiber bands. The axial elements show a diffuse arrangement (Fig. 13E).
Sieve-tube elements. As seen in transverse section, each sieve element is associated with one companion cell, seldom two. Sieve tubes of two distinct diameters occur together and are predominantly solitary, occasionally in radial or tangential multiples of 2-3. As seen in longitudinal section, the sieve elements are short (<1 mm) with inclined end walls, bearing sieve plates with 6-7 sieve areas (Fig. 13F).
Axial parenchyma. The phloem parenchyma forms a matrix where sieve elements and fiber bands are embedded (Fig. 13E), with cells that may be as wide as the sieve tubes. Sometimes radial rows of 3-4 cells of phloem parenchyma may be found between sieve elements. A crystalliferous parenchyma surrounds the fiber bands.
Fibers. The fiber bands in Calliclamys are composed of 3-4 cell rows (Fig. 13E).
Rays. The limiting rays are lignified only to the xylem face. The wedge rays are non-lignified, even when crossing the fiber bands (Fig. 13E).
Crystals. Acicular crystals are predominate in the crystalliferous parenchyma, but can be also found in other cells of the phloem and ray parenchyma.
Periderm
A single periderm formed. The phellem is non-stratified, and evenly thin-walled (Table 2). The phelloderm is thick, with over three layers of cells, stratified. Lenticels are non-stratified, with unlignified filling cells (Table 2).
description: Published as part of Pace, Marcelo R., Marcati, Carmen R., Lohmann, Lúcia G. & Angyalossy, Veronica, 2023, Bark anatomy of lianescent Bignoniaceae: a generic synopsis, pp. 167-210 in Adansonia (3) (3) 45 (12) on page 190, DOI: 10.5252/adansonia2023v45a12, http://zenodo.org/record/8006364
Boundary criticality at the Anderson transition between a metal and a quantum spin Hall insulator in two dimensions
Creators: name: Obuse, Hideaki
name: Furusaki, Akira
name: Ryu, Shinsei
name: Mudry, Christopher
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Static disorder in a noninteracting gas of electrons confined to two dimensions can drive a continuous quantum (Anderson) transition between a metallic and an insulating state when time-reversal symmetry is preserved but spin-rotation symmetry is broken. The critical exponent $ν$ that characterizes the diverging localization length and the bulk multifractal scaling exponents that characterize the amplitudes of the critical wave functions at the metal-insulator transition do not depend on the topological nature of the insulating state, i.e., whether it is topologically trivial (ordinary insulator) or nontrivial (a $Z_2$ insulator supporting a quantum spin Hall effect). This is not true of the boundary multifractal scaling exponents which we show (numerically) to depend on whether the insulating state is topologically trivial or not.
description: 12 pages, 13 figures, selected for an Editors' Suggestion in PRB
Teknologi Blockchain untuk Repositori Institusi
Creators: name: Multazam, Mochammad Tanzil
Publisher: name: Zenodo
Year: 2021
Subjects: blockchain
repository
lockss
filecoin
arweave

description: Materi disampaikan pada acara Difos Framework 27-11-2021
description: {"references": ["Daniel, Erik, and Florian Tschorsch. \"IPFS and Friends: A Qualitative Comparison of Next Generation Peer-to-Peer Data Networks.\" arXiv preprint arXiv:2102.12737 (2021). https://arxiv.org/abs/2102.12737"]}
Magnaspina siamensis
Creators: name: Gusakov, Vladimir A.
name: Dien, Tran Duc
name: Tran, Hoan Quoc
name: Thanh, Nguyen Thi Hai
name: Huan, Phan Trong
name: Ha, Vo Thi
name: Dinh, Cu Nguyen
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Branchiopoda
Anomopoda
Chydoridae
Magnaspina
Magnaspina siamensis

description: 34. Magnaspina siamensis (Sinev et Sanoamuang, 2007)
Localities and specimens found: 25 – 2♀ em; 26 – 1♀, 1♀ ov.
Distribution and ecology. Magnaspina siamensis (formerly Alona siamensis Sinev et Sanoamuang, 2007) is a rare species described from Thailand, an endemic to the Oriental region (Sinev & Sanoamuang 2007; Sinev 2016). Currently, the species is also known from Malaysia, Laos, India and South Vietnam (Korovchinsky 2013; Kotov et al. 2013b; Sinev & Korovchinsky 2013; Sinev 2016; Sousa & Padhye 2020). In Vietnam, Magnaspina siamensis was first recorded as Alonella dentifera Sars, 1901 by Shirota (1966) (see Remarks below for details).
The lifestyle and ecology of Magnaspina siamensis are little studied. To date, this chydorid has been discovered mainly in small, vegetated water bodies, namely swamps, rice fields, ponds, ditches, floodplains (Sinev & Sanoamuang 2007; Sinev & Korovchinsky 2013; Sousa & Padhye 2020; Choedchim & Maiphae 2023). In our material, a few individuals of this species were found in the open and overgrown littoral of a small reservoir (see Appendix 1).
Remarks. It should be noted that probably all records of Alonella dentifera -like populations (later known as Alona or Coronatella dentifera (Sars, 1901)) from the Oriental region (e.g., by Shirota (1966), Idris & Fernando (1981), Idris (1983), Maiphae et al. (2005, 2008), etc.) are in fact Magnaspina siamensis too (Sinev & Sanoamuang 2007; Van Damme et al. 2010; Chartejee et al. 2013; Kotov et al. 2013b; Van Damme & Sinev 2013; Sousa et al. 2016b; Choedchim & Maiphae 2023). The recent species M. dentifera (Sars, 1901), the “successor” of Alonella dentifera, originally described from Brazil, is now considered an inhabitant of the Neotropics only (Sousa et al. 2016b).
description: Published as part of Gusakov, Vladimir A., Dien, Tran Duc, Tran, Hoan Quoc, Thanh, Nguyen Thi Hai, Huan, Phan Trong, Ha, Vo Thi & Dinh, Cu Nguyen, 2025, An annotated checklist of the main representatives of meiobenthos from inland water bodies of Central and Southern Vietnam. III. Water fleas (Cladocera), pp. 401-455 in Zootaxa 5613 (3) on pages 419-420, DOI: 10.11646/zootaxa.5613.3.1, http://zenodo.org/record/15216705
The Solar Memory From Hours to Decades
Creators: name: Aschwanden, Markus J.
name: Johnson, Jay R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Waiting time distributions allow us to distinguish at least three different types of dynamical systems, such as (i) linear random processes (with no memory); (ii) nonlinear, avalanche-type, nonstationary Poisson processes (with memory during the exponential growth of the avalanche rise time); and (iii) chaotic systems in the state of a nonlinear limit cycle (with memory during the oscillatory phase). We describe the temporal evolution of the flare rate $λ(t) \propto t^p$ with a polynomial function, which allows us to distinguish linear ($p \approx 1$) from nonlinear ($p \gapprox 2$) events. The power law slopes $α$ of observed waiting times (with full solar cycle coverage) cover a range of $α=2.1-2.4$, which agrees well with our prediction of $α= 2.0+1/p = 2.3-2.5$. The memory time can also be defined with the time evolution of the logistic equation, for which we find a relationship between the nonlinear growth time $τ_G = τ_{rise}/(4p)$ and the nonlinearity index $p$. We find a nonlinear evolution for most events, in particular for the clustering of solar flares ($p=2.2\pm0.1$), partially occulted flare events ($p=1.8\pm0.2$), and the solar dynamo ($p=2.8\pm0.5$). The Sun exhibits memory on time scales of $\lapprox$2 hours to 3 days (for solar flare clustering), 6 to 23 days (for partially occulted flare events), and 1.5 month to 1 year (for the rise time of the solar dynamo).
description: 11 pages, 1 Table, 5 Figures
Relative-Velocity-Dependent Weber-type Models in Electromagnetism
Creators: name: Devasia, Santosh
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Physics (physics.gen-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: This article reconsiders the relative-velocity-dependent approach to modeling electromagnetism that was proposed initially by Weber before data from cathode-ray-tube (CRT) experiments was available. It is shown that identifying the nonlinear, relative-velocity terms using CRT data results in a model, which not only captures standard relativistic effects in optics, high-energy particles, and gravitation, but also explains apparent discrepancies between predicted and measured energy (i) in high-energy-particle absorption experiments and (ii) in the classical beta-ray spectrum of radium-E.
description: 23 pages 9 figures
Degradability and utilization of dietary nitrogen sources commonly fed to dairy cows
Creators: name: Snider, Jeffrey Allan
Publisher: name: University of British Columbia
Year: 2010

description: Various forages commonly provided to dairy cattle were fed to cannulated steers in order to study dietary nitrogen breakdown and utilization. Feed intake and apparent digestibility of dry matter, fibre and nitrogen were monitored as well as microbial nitrogen production in the rumen. Two Holstein and two Ayrshire steers, each fitted with a re-entrant duodenal cannula were used. Two of the steers were also used before the cannulae were fitted. Five different forages were investigated: low quality grass hay (1.7%N), alfalfa cubes (2.3%N), high quality grass hay (2.7%N), Italian ryegrass (1.7%N) and orchard grass (2.1%N). For each forage, each steer was allowed a two-week adaptation period followed by a four-day digestiblity collection period. Fecal samples were obtained daily, and digesta samples were collected at the duodenum three times daily. Unfortunately, due to illnesses, only one steer was able to complete all of the digestibility trials with all of the forages. When low quality hay and alfalfa cubes were given, cannulation had no effect (p>.05) on feed intake or apparent digestibility of fibre and nitrogen. Only apparent digestiblity of dry matter was higher (p<.05) for the intact steers. Feed intake, and apparent digestibility of dry matter and nitrogen were greater (p<.05) for the higher nitrogen (alfalfa cube) diet. Forage type had no effect (p>.05) on feed intake, and apparent digestibility of dry matter and fibre when any of the forages were given to cannulated steers. Nitrogen apparent digestibility was greater (p<.05) for the higher nitrogen forages. The amount of feed offered (maintenance or ad libitum) had no effect (p>.05) on feed intake, dry matter, fibre and nitrogen digestibilities. In respect to apparent digestibilities and quantities of microbial nitrogen obtained at the duodenum, forage type had a significant effect on all parameters. The proportion of apparent digestibility of dry matter and fibre occurring in the rumen were greater (p<.05) for the lower nitrogen forages. The proportion of nitrogen digestibility occurring in the rumen was greater (p<.05) for the higher nitrogen forages. The ratio of microbial nitrogen: total nitrogen was greater (p<.05) for the lower nitrogen forages. The particular day of the digestibility trial or time of duodenal sample collection had no effect (p>.05) on apparent digestibilities or total microbial nitrogen. Feeding level had a significant effect on some of the parameters at the duodenum. Apparent digestibility of fibre and nitrogen and total microbial nitrogen were higher (p<.05) when the forage was fed ad libitum. The quantity of bypass nitrogen measured at the duodenum, and the apparent digestibility of the bypass nitrogen was much lower for the lower nitrogen forages.
Hyperfine structure of the metastable 3P2 state of alkaline earth atoms as an accurate probe of nuclear magnetic octupole moments
Creators: name: Beloy, K.
name: Derevianko, A.
name: Johnson, W. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Measuring the hyperfine structure (HFS) of long-lived $^3P_2$ states of divalent atoms may offer the opportunity of extracting relatively unexplored nuclear magnetic octupole and electric hexadecapole moments. Here, using relativistic many-body methods of atomic structure and the nuclear shell model, we evaluate the effect of these higher nuclear moments on the hyperfine structure. We find that the sensitivity of HFS interval measurements in $^{87}$Sr needed to reveal the perturbation caused by the nuclear octupole moment is on the order of kHz. Results of similar analyses for $^{9}$Be, $^{25}$Mg, and $^{43}$Ca are also reported.
description: 11 pages, Phys. Rev. A in press. In v2 added discussion of second-order magnetic-dipole electring-quadrupole correction
Turn-initial position
Creators: name: Koivisto, Aino
Publisher: name: OSF
Year: 2022
Subjects: Conversation Analysis
Encyclopedia
Ethnomethodology
Interactional Linguistics

description: Elements in turn-initial position have been broadly defined as ”any token or formulaic phrase that begins and prefaces a turn (and thus a TCU)” (Kim & Kuroshima 2013: 269). On a general level, elements in turn-initial position project the type and shape of the upcoming turn, and show how the turn relates to the previous talk (Heritage & Sorjonen 2018b; Kim & Kuroshima 2013; Schegloff 1987, 1996: 81–82).
Geometrical approach to mutually unbiased bases
Creators: name: Klimov, A. B.
name: Romero, J. L.
name: Bjork, G.
name: Sanchez-Soto, L. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a unifying phase-space approach to the construction of mutually unbiased bases for a two-qubit system. It is based on an explicit classification of the geometrical structures compatible with the notion of unbiasedness. These consist of bundles of discrete curves intersecting only at the origin and satisfying certain additional properties. We also consider the feasible transformations between different kinds of curves and show that they correspond to local rotations around the Bloch-sphere principal axes. We suggest how to generalize the method to systems in dimensions that are powers of a prime.
description: 10 pages. Some typos in the journal version have been corrected
Editorial: Welcome to Entangled Religions!
Creators: name: Strotmann, Vivian
Publisher: name: Ruhr-Universität Bochum
Year: 2014
Subjects: religious contact; religious transfer; interdisciplinary research; online journal; Ruhr-Universität Bochum; CERES; KHK; Federal Ministry of Education and Research

description: This article offers you a brief introduction to Entangled Religions.
Thank you for your interest in our online journal!
description: Entangled Religions, Vol 1 (2014)
Dolichandra
Creators: name: Pace, Marcelo R.
name: Marcati, Carmen R.
name: Lohmann, Lúcia G.
name: Angyalossy, Veronica
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Bignoniaceae
Dolichandra

description: XIV. Dolichandra clade
TAXONOMIC INFORMATION. — This clade contains a single genus, Dolichandra, with multiple dissected phloem wedges in transversal section. Dolichandra currently includes species from four previously recognized genera (see Fischer et al. 2004; Table 2), Dolichandra, Macfadyena A.DC., Melloa Bureau, and Parabignonia Bureau ex K.Schum.
TOTAL NUMBER OF SPECIES IN THIS CLADE. — 9 species (Fonseca et al. 2017).
STUDIED SPECIES. — Three species, Dolichandra quadrivalvis (Jacq.) L.G.Lohmann, Dolichandra unguiculata (Vell.) L.G.Lohmann, and Dolichandra unguis-cati (L.) L.G. Lohmann.
Regular phloem
Thin to thick fiber bands, without assemblages.
Variant phloem
The variant phloem of Dolichandra is nearly identical to that of the Multiples of four s.s. clade.In fact,the sieve tubes and phloem parenchyma arrangement, the sieve plate type, the presence of crystals, and the number of cells between fiber bands is alike in both clades (Fig. 16 A-C). The presence of sieve elements of two distinct diameters (40 µm and 15 µm in average) tending to gradually go from wide to narrow diameter in subsequent bands (Fig. 16D) is similar to that found in Amphilophium. Another similarity with Amphilophium is the storied structure (Fig. 16E); however, the storied structure in Dolichandra is found both for axial and radial elements (Fig. 16E). A further remarkable difference from the Multiples of four s.s. clade is the non-lignification of the limiting rays (Fig. 16 A-C), that tend to divide, compress, and dissect the phloem wedges (Fig. 16A, C). The crystalliferous parenchyma in Dolichandra bears acicular crystals, which are also found in the rays (Fig. 16D, F).
Periderm
A single periderm is formed.The phellem is stratified,with alternating thin and thick-walled cells.The phelloderm is non-stratified, thin, with less than three cell layers.Lenticels were not observed.
description: Published as part of Pace, Marcelo R., Marcati, Carmen R., Lohmann, Lúcia G. & Angyalossy, Veronica, 2023, Bark anatomy of lianescent Bignoniaceae: a generic synopsis, pp. 167-210 in Adansonia (3) (3) 45 (12) on pages 194-195, DOI: 10.5252/adansonia2023v45a12, http://zenodo.org/record/8006364
The equation of state for scalar-tensor gravity
Creators: name: Wu, Shao-Feng
name: Yang, Guo-Hong
name: Zhang, Peng-Ming
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the field equation of Brans-Dicke gravity and scalar-tensor gravity can be derived as the equation of state of Rindler spacetime, where the local thermodynamic equilibrium is maintained. Our derivation implies that the effective energy can not feel the heat flow across the Rindler horizon.
description: 6 pages, to be published in Prog. Theor. Phys
ERROR REDUCTION OF CORROSION RESISTANCE TESTING PROCESS
Creators: name: Onanong Chaowakul
name: Damrong Taweesangsakulthai
Publisher: name: Faculty of Engineering, Khon Kaen Univeristy
Year: 2010
Subjects: Corrosion resistance testing process,ISO/IEC 17025, FMEA technique, Error control system

description: 4, 37, KKU Engineering Journal
Meromorphic functions with linearly distributed values and Julia sets of rational functions
Creators: name: Bergweiler, Walter
name: Eremenko, Alexandre
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37F10, 30D05, 30D30

description: If the preimage of a four-point set under a meromorphic function belongs to the real line, then the image of the real line is contained in a circle in the Riemann sphere. We include an application of this result to holomorphic dynamics: if the Julia set of a rational function is contained in a smooth curve then it is contained in a circle.
description: 6 pages
D5.1 - TECHNICAL DOCUMENTATION OF THE INVOICING MODULE FOR R2
Creators: name: Drosi, Gaetano
name: Avakian, Jennifer
name: Lorandi, Mattia
name: Borges, Cruz E.
name: Martinez, Jordi
name: Giavini, Michele
Publisher: name: Zenodo
Year: 2018
Subjects: Invoice Module
Software
PAYT (Pay As You Throw)
Pricing Systems
IOT technology
Municipal Solid Waste
Unit pricing
Radio-frequency identification
Identifier (ID)

description: This deliverable presents the technical documentation of the Invoicing Module for R2 and contains the technical explanation of new invoicing software that integrates PAYT (Pay As You Throw) schemes. Section 2 provides an overview of PAYT schemes in Waste4Think but we have leaved details in D1.3. Section 3 explains content and methodology used in this deliverable. Section 4 presents the security assessment of the components used in Seveso and Zamudio pilots. Section 5 provides the Architecture of the Software, giving an overview of the three software - WINTARIF, Mawis U3.0 and FDeusto software - by introducing the relationship between the environment and the development principles used in component design and by describing i. how the software is divided; ii. the functionality of every component; iii. the main interaction between each component, which fulfilsthe functional requirements. Section 6 presents the Data Interface describing how the invoice module is related to the external environment and the interfaces for Wintarif software, while for FDeusto Open Source Software, it is described the extension to the data model presented in Section 7 of Deliverable D2.1 used to store the information needed to issue the PAYT in Zamudio. Section 7 describes how the tariff is algebraically defined and examples notice of payment structure for the Seveso pilot. Section 9 describes how the safety, reliability, transparency and data security are guarantee in Wintarif Software.
Particle
Creators: name: Koivisto, Aino
Publisher: name: OSF
Year: 2022
Subjects: Conversation Analysis
Encyclopedia
Ethnomethodology
Interactional Linguistics

description: CA/IL studies use the term particle to refer to small, uninflected words that can occupy different positions in a turn (e.g., Couper-Kuhlen & Selting 2018: 495). Thus, a CA/IL understanding of particles includes words that have been classified as interjections, i.e., elements than can form an utterance on their own (e.g., oh, mm-hm, yeah, okay; see Ameka 1992, Norrick 2009) as well as (discourse) particles that typically do not occur as an utterance of their own, such as connectives.
The Tidal Tails of NGC 5466
Creators: name: Fellhauer, M.
name: Evans, N. W.
name: Belokurov, V.
name: Wilkinson, M. I.
name: Gilmore, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The study of substructure in the stellar halo of the Milky Way has made a lot of progress in recent years, especially with the advent of surveys like the Sloan Digital Sky Survey. Here, we study the newly discovered tidal tails of the Galactic globular cluster NGC 5466. By means of numerical simulations, we reproduce the shape, direction and surface density of the tidal tails, as well as the structural and kinematical properties of the present-day NGC 5466. Although its tails are very extended in SDSS data (> 45 degrees), NGC 5466 is only losing mass slowly at the present epoch and so can survive for probably a further Hubble time. The effects of tides at perigalacticon and disc crossing are the dominant causes of the slow dissolution of NGC 5466, accounting for about 60 % of the mass loss over the course of its evolution. The morphology of the tails provides a constraint on the proper motion -- the observationally determined proper motion has to be refined (within the stated error margins) to match the location of the tidal tails.
description: MNRAS, in press
A digital image preprocessor for optical character recognition
Creators: name: Lunscher, Wolfram H.H.J.
Publisher: name: University of British Columbia
Year: 2010

description: Optical character recognition requires that data acquired from a camera device first be reconditioned into a suitable form. This thesis presents a design study of a preprocessor intended to accomplish this task under the constraints of real-time, autonomous operation as part of a reading machine for the blind. The preprocessor contains three components: a filter to reduce the influence of noise and enhance the text seen; a binarization stage to identify the character and background pixels by a single bit; and a segmention system which isolates individual characters for delivery to the recognizer in proper causal order. Filtering of the acquired video information is performed with the Laplacian of a Gaussian, V²g, edge detection operator developed by D. Marr. This filter is shown to locate the character edges and to control the amount of detail seen optimally. Developed from models of the human visual system, this filter promises that the preprocessor could attain a human text resolution capability. Binarization is also reduced to a simple thresholding of the filter's output. To achieve optimal enhancement of print structures of known dimensions a filter design strategy is presented incorporating two periodic edge models. Since the filter must be digitized, the design method is further extended to include an analysis of the effects of sampling the continuous filter and quantizing its coefficients for a direct-form finite impulse response implementation. To validate the claim that this filter's performance is superior to other edge detection methods, a chapter is devoted to quantitative evaluation of V²g filtered test images. The results are compared to others published and found superior, as well as remarkably noise immune. Segmentation of the binarized text is accomplished with a technique adapted from the binary-image description method of C.T. Zahn. The text images are reduced to a hybrid chain-code-and-coordinate description of all internal and external boundaries concurrent with the incoming raster-acquired data. No more than two image scan lines need be stored. All closed borders within the text are detected immediately as they occur by monitoring the local changes in the image's Euler number during a scan, and verifying global closure by following pointers through a linked-list data structure. A simulation of an implementation of the segmentation system, operating on fifty V²g filtered test images, indicated that the real-time performance objective can be achieved through a combined serial and parallel architecture.
Transport Control in Low-Dimensional Spin-1/2 Heisenberg Systems
Creators: name: Santos, L. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze transport of local magnetization and develop schemes to control transport behavior in finite spin-1/2 Heisenberg chains and spin-1/2 Heisenberg two-leg ladders at zero temperature. By adjusting parameters in the Hamiltonians, these quantum systems may show both integrable and chaotic limits. We provide examples of chaotic systems leading to diffusive and to ballistic transport. In addition, methods of coherent quantum control to induce a transition from diffusive to ballistic transport are proposed.
description: 8 pages, 5 figures
Numerical diagonalization analysis of the criticality of the (2+1)-dimensional XY model: Off-diagonal Novotny's method
Creators: name: Nishiyama, Yoshihiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The criticality of the (2+1)-dimensional XY model is investigated with the numerical diagonalization method. So far, it has been considered that the diagonalization method would not be very suitable for analyzing the criticality in large dimensions (d \ge 3); in fact, the tractable system size with the diagonalization method is severely restricted. In this paper, we employ Novotny's method, which enables us to treat a variety of system sizes N=6,8,...,20 (N: the number of spins constituting a cluster). For that purpose, we develop an off-diagonal version of Novotny's method to adopt the off-diagonal (quantum-mechanical XY) interaction. Moreover, in order to improve the finite-size-scaling behavior, we tune the coupling-constant parameters to a scale-invariant point. As a result, we estimate the critical indices as ν=0.675(20) and γ/ν=1.97(10).
A momentum-space representation of Green's functions with modified dispersion on ultra-static space-time
Creators: name: Rinaldi, Massimiliano
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the Green's functions associated to a scalar field propagating on a curved, ultra-static background, in the presence of modified dispersion relations. The usual proper-time deWitt-Schwinger procedure to obtain a series representation of the Green's functions is doomed to failure, because of higher order spatial derivatives in the Klein-Gordon operator. We show how to overcome this difficulty by considering a preferred frame, associated to a unit time-like vector. With respect to this frame, we can express the Green's functions as an integral over all frequencies of a space-dependent function. The latter can be expanded in momentum space, as a series with geometric coefficients similar to the deWitt-Schwinger's ones. By integrating over all frequencies, we finally find the expansion of the Green's function up to four derivatives of the metric tensor. The relation with the proper-time formalism is also discussed.
description: revtex, version accepted for publication in Phys. Rev. D
Brachyuromys ramirohitra , Major 1896
Creators: name: Denys, Christiane
name: Gabriel, Nadine W.
name: Lalis, Aude
name: Jenkins, Paulina
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Nesomyidae
Brachyuromys
Brachyuromys ramirohitra

description: Brachyuromys ramirohitra Major, 1896
This species can be diagnosed by its long molar row and wide M1. The crown is higher and the link between lophs appears only in very worn specimens. The three lophs of M1–2 are very oblique. The m3 is long and narrow.
Attributed material: Lower Stratum: 1 skull fragment and 2 left mandibles; see Appendix.
These specimens are at a relatively advanced stage of wear and are comparatively large for the species. On the M1 one can see three oblique lophs and a slight trace of a longitudinal link between the first and second lophs (Figure 2). On the lower molars the lophs are also very oblique and there is only a slight trace of the longitudinal link between the second and third lophs of m1. The molar row length and width of M1 fits well with modern specimens (Figure 3, Table 1).
description: Published as part of Denys, Christiane, Gabriel, Nadine W., Lalis, Aude & Jenkins, Paulina, 2024, Subfossil rodents and tenrecs of Children's Cave, Madagascar, pp. 796-839 in Journal of Natural History 58 (25 - 28) on pages 801-802, DOI: 10.1080/00222933.2024.2370663, http://zenodo.org/record/13219769
Casimir effect in toroidally compactified de Sitter spacetime
Creators: name: Saharian, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Vacuum energy density and stresses are investigated for a scalar field with general curvature coupling parameter in (D+1)-dimensional de Sitter spacetime with an arbitrary number of toroidally compactified spatial dimensions. The corresponding expectation values are presented in the form of the sum of the vacuum expectation values in uncompactified dS spacetime and the part induced by the non-trivial topology. In the early stages of the cosmological evolution the topological parts dominate. In this limit the behavior of the Casimir densities does not depend on the curvature coupling parameter and coincides with that for a conformally coupled massless field. At late stages of the cosmological expansion the expectation values are dominated by the part corresponding to uncompactified dS spacetime. The vanishing of the topological parts is monotonic or oscillatory in dependence of the mass and the curvature coupling parameter of the field.
description: 8 pages, 1 figure, talk presented at the 7th Alexander Friedmann International Seminar on Gravitation and Cosmology, 29 June - 5 July, 2008, Joao Pessoa, Brazil
The Effect of Continuum Elimination in Identifying Circumstellar Dust around Mira
Creators: name: Shepard, Lisa M.
name: Speck, Angela K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Asymptotic Giant Branch (AGB) stars are major contributors of cosmic dust to the universe. Typically, dust around AGB stars is investigated via radiative transfer (RT) modeling, or via simple deconstruction of observed spectra. However, methodologies applied vary. Using archival spectroscopic, photometric, and temporal data for the archetypal dusty star, Mira, we identify its circumstellar silicate dust grains. This is achieved by matching the positions and widths of observed spectral features with laboratory data. To do this comparison properly, it is necessary to account for the continuum emission. Here we investigate various ways in which a continuum is eliminated from observational spectra and how it affects the interpretation of spectral features. We find that while the precise continuum shapes and temperatures do not have a critical impact on the positions and shapes of dust spectral features, it is important to eliminate continua in a specific way. It is important to understand what contributes to the spectrum in order to remove the continuum in a way that allows comparison with laboratory spectra of candidate dust species. Our methodologies are applicable to optically thin systems, like that of Mira. Higher optical depths will require RT modeling, which cannot include many different potential astrominerals because there is a lack of complex refractive indices. Finally, we found that the classic silicate feature exhibited by Mira is not consistent with a real amorphous silicate alone but may be best explained with a small alumina contribution to match the observed FWHM of the 10 micron feature.
description: 10 pages, 10 figures, published by the Monthly Notices of the Royal Astronomical Society 08 July 2021
Pilot-stick perturbations - illustration notebook
Creators: name: Pirot, Guillaume
Publisher: name: Zenodo
Year: 2021

description: Illustration of pilot-stick perturbations with a notebook. This work is supported by the ARC-funded Loop: Enabling Stochastic 3D Geological Modelling consortia (LP170100985) and DECRA (DE190100431) and by the Mineral Exploration Cooperative Research Centre whose activities are funded by the Australian Government's Cooperative Research Centre Programme.
Large-scale variations of the cosmic X-ray background and the X-ray emissivity of the local Universe
Creators: name: Revnivtsev, M.
name: Molkov, S.
name: Sazonov, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the cosmic X-ray background (CXB) intensity variations on large angular scales using slew data of the RXTE observatory. We detect intensity variations up to ~2% on angular scales of 20--40deg. These variations are partly correlated with the local large-scale structure, which allowed us to estimate the emissivity of the local Universe in the energy band 2--10 keV at 9+/-4 x 10^{38} ers/sec/Mpc^{3}. The spectral energy distribution of the large-angular-scale variations is hard and is compatible with that of the CXB, which implies that normal galaxies and clusters of galaxies, whose spectra are typically much softer, do not contribute more than 15% to the total X-ray emissivity of the local Universe. Most of the observed CXB anisotropy (after exclusion of point sources with fluxes >10^{-11} erg/s/cm^2) can be attributed to low-luminosity AGNs
description: 12 pages, 9 figures, Submitted to A&A
Exámenes en Moodle con la herramienta "Cuestionario"
Creators: name: Escudero, Francisco Pérez
name: Aixelá, Javier Franco
Publisher: name: Zenodo
Year: 2020
Subjects: Moodle
exámenes

description: Tutorial para ayudar al profesorado del Departamento de Traducción e Interpretación de la Universidad de Alicante a preparar exámenes con Moodle, dentro de UACloud.
Selective mortality of juvenile sockeye (Oncorhynchus nerka) in Babine Lake determined from body-otolith relationships
Creators: name: West, Cameron John
Publisher: name: University of British Columbia
Year: 2010

description: The presence of differential growth and mortality was investigated among juvenile sockeye (Oncorhynchus nerka) in Babine Lake. Emergent fry were collected from the rivers and artificial spawning channels of the Fulton River and Pinkut Creek systems in May and early June of 1979. Juvenile samples were tow-netted from Babine Lake in July, August and September, and smolt samples were collected in May and June of the following year at the outlet of the Babine-Nilkitkwa lake sys tern. Fork lengths and the dimensions of sagitta otoliths were measured. Orthogonal polynomials fitted to Ln fork length versus Ln otolith size between the stages of fry emergence and smolt migration were sigmoid with r² values of 0.97 to 0.98. Significant stock differences were found among linear regressions of Ln fork length versus Ln total otolith length of emergent fry from Fulton River, Pinkut Creek and the three artificial spawning channels. Grouping of Fulton versus Pinkut or of river versus channel sources was not obvious. An average regression was calculated for general use with emergent fry from the main lake population. Instantaneous growth rate of fry in early July was positively correlated with fork length. The distributions of emergent fork length back-calculated from juvenile and smolt samples indicated higher mortality rates among fry with smaller fork lengths at emergence. The timing of the selective mortality was between mid-August and smolt migration in the following spring. The association of smaller initial body size with increased probability of parasitization by the cestode Eubothrium salvelini, subsequent slower growth and the effect on the size distribution of the year class is discussed.
Period-color and amplitude-color relations in classical Cepheid variables V: The Small Magellanic Cloud Cepheid models
Creators: name: Kanbur, S.
name: Ngeow, C.
name: Feiden, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Period-colour (PC) and amplitude-colour (AC) relations at maximum, mean and minimum light are constructed from a large grid of full amplitude hydrodynamic models of Cepheids with a composition appropriate for the SMC (Small Magellanic Cloud). We compare these theoretical relations with those from observations. The theoretical relations are in general good agreement with their observational counterparts though there exist some discrepancy for short period (log [P] < 1) Cepheids. We outline a physical mechanism which can, in principle, be one factor to explain the observed PC/AC relations for the long and short period Cepheids in the Galaxy, LMC and SMC. Our explanation relies on the hydrogen ionization front-photosphere interaction and the way this interaction changes with pulsation period, pulsation phase and metallicity. Since the PC relation is connected with the period-luminosity (PL) relation, it is postulated that such a mechanism can also explain the observed properties of the PL relation in these three galaxies.
description: 10 pages, 6 figures and 6 tables, MNRAS accepted
Growth of toric domains in the smectic phase of oxadiazoles
Creators: name: Sparavigna, A.
name: Mello, A.
name: Montrucchio, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In a previous paper (Phase Transitions, 80(9), 987, 2007) we discussed the smectic and nematic textures of some mesomorphic oxadiazole compounds with terminal Cl-substituent. Optical microscope investigations showed a very interesting behaviour of smectic and nematic phases; the smectic phase has fan-shaped and toric textures and the nematic phase has spherulitic domains, which disappear as the sample is further heated, the texture changing into a smooth one. Here, we investigate four oxadiazole compounds with the same structure but terminal Br-substituent. The behaviour of the smectic and nematic phases is like that observed in the compounds with Cl. The focus of the paper is on the growth of toric domains from the nematic melt and on the role of defects in the domain structure.
description: 16 pages, 8 figures
Brachyuromys betsileoensis
Creators: name: Denys, Christiane
name: Gabriel, Nadine W.
name: Lalis, Aude
name: Jenkins, Paulina
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Nesomyidae
Brachyuromys
Brachyuromys betsileoensis

description: Brachyuromys betsileoensis (Bartlett, 1880)
Most of the remains attributed to Brachyuromys by Major under the invalid name B. arvicoloides belong to the smaller species B. betsileoensis.
Attributed material: Lower Stratum: 1 maxilla; 1 mandibular ramus. Upper Stratum: 30 crania and maxillary fragments; 44 mandibular rami; 5 molars; see Appendix for details.
The two specimens from the Lower Stratum belong to a juvenile (CD77) and an adult specimen (CD78). They are both small but fit within the variability of the modern B. betsileoensis (Table 1). The other specimens from the Upper Stratum are relatively similar in size to modern representatives but always fit within the smallest dimensions of the bivariate graphs (Figure 3). They display lophs that are less oblique than those of B. ramirohitra and the longitudinal links between lophs are visible until an advanced stage of wear (Figure 4a,b).
description: Published as part of Denys, Christiane, Gabriel, Nadine W., Lalis, Aude & Jenkins, Paulina, 2024, Subfossil rodents and tenrecs of Children's Cave, Madagascar, pp. 796-839 in Journal of Natural History 58 (25 - 28) on pages 802-803, DOI: 10.1080/00222933.2024.2370663, http://zenodo.org/record/13219769
Molecular Gas Distribution in Barred and Non-Barred Galaxies along the Hubble Sequence
Creators: name: Komugi, S.
name: Sofue, Y.
name: Kohno, K.
name: Nakanishi, H.
name: Onodera, S.
name: Egusa, F.
name: Muraoka, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from a survey of 12CO(J=1-0) spectra obtained for the central regions of 68 nearby galaxies at an angular resolution of 16 arcseconds using the Nobeyama Radio Observatory 45m telescope, aimed at characterizing the properties of star forming molecular gas. Combined with similar resolution observations in the literature, the compiled sample set of 166 galaxies span a wide range of galactic properties. NGC 4380, which was previously undetected in CO, was detected. This initial paper of a series will focus on the data and the gaseous properties of the samples, and particularly on the degree of central concentration of molecular gas in a range of morphological types, from early (S0/Sa) to late (Sd/Sm) galaxies with and without bars. The degree of molecular central concentration in the central kiloparsec, compared to the central several kiloparsecs of galaxies, is found to vary smoothly with Hubble type, so that early type galaxies show larger central concentration. The comparison of barred and non-barred galaxies within early and late type galaxies suggest that difference in Hubble type, representing the effect of bulges, is the more important factor in concentrating gas into the central regions than bars.
description: 51 pages, 13 figures, accepted for publication in ApJS. Higher resolution figures can be found at http://www.ioa.s.u-tokyo.ac.jp/~skomugi/papers/MS73937v3.pdf
High-frequency corrections to the detector response and their effect on searches for gravitational waves
Creators: name: Rakhmanov, M.
name: Romano, J. D.
name: Whelan, J. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Searches for gravitational waves with km-scale laser interferometers often involve the long-wavelength approximation to describe the detector response. The prevailing assumption is that the corrections to the detector response due to its finite size are small and the errors due to the long-wavelength approximation are negligible. Recently, however, Baskaran and Grishchuk (2004 Class. Quantum Grav. 21 4041) found that in a simple Michelson interferometer such errors can be as large as 10 percent. For more accurate analysis, these authors proposed to use a linear-frequency correction to the long wavelength approximation. In this paper we revisit these calculations. We show that the linear-frequency correction is inadequate for certain locations in the sky and therefore accurate analysis requires taking into account the exact formula, commonly derived from the photon round-trip propagation time. Also, we extend the calculations to include the effect of Fabry-Perot resonators in the interferometer arms. Here we show that a simple approximation which combines the long-wavelength Michelson response with the single-pole approximation to the Fabry-Perot transfer function produces rather accurate results. In particular, the difference between the exact and the approximate formulae is at most 2-3 percent for those locations in the sky where the detector response is greater than half of its maximum value. We analyse the impact of such errors on detection sensitivity and parameter estimation in searches for periodic gravitational waves emitted by a known pulsar, and in searches for an isotropic stochastic gravitational-wave background. At frequencies up to 1 kHz, the effect of such errors is at most 1-2 percent. For higher frequencies, or if more accuracy is required, one should use the exact formula for the response.
description: 13 pages, 6 figures, accepted by Classical and Quantum Gravity for GWDAW12 proceedings