oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
(4-Nitrophenolato)(subphthalocyaninato)boron(III)Electron withdrawing groups in the para position of the phenoxy molecular fragment. Part 2. For Part 1, see Paton et al. (2010a).  [cached]
Andrew S. Paton,Alan J. Lough,Timothy P. Bender
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810050580
Abstract: The main feature of the structure of the title compound, C30H16BN7O3 or NO2PhO-BsubPc, are pairs of molecules linked through π-interactions between the concave faces of the BsubPc fragments at a distance of 3.5430 (11) across an inversion centre. However, the angle between the planes of the five- and six-menbered rings involved in this interaction is 1.44 (10)°, causing the interacting BsubPcs units to be slightly askew rather than parallel as is typical for π-stacking interactions.
Zoom Better to See Clearer: Human Part Segmentation with Auto Zoom Net  [PDF]
Fangting Xia,Peng Wang,Liang-Chieh Chen,Alan L. Yuille
Computer Science , 2015,
Abstract: Parsing human regions into semantic parts, e.g., body, head and arms etc., from a random natural image is challenging while fundamental for computer vision and widely applicable in industry. One major difficulty to handle such a problem is the high flexibility of scale and location of a human instance and its corresponding parts, making the parsing task either lack of boundary details or suffer from local confusions. To tackle such problems, in this work, we propose the "Auto-Zoom Net" (AZN) for human part parsing, which is a unified fully convolutional neural network structure that: (1) parses each human instance into detailed parts. (2) predicts the locations and scales of human instances and their corresponding parts. In our unified network, the two tasks are mutually beneficial. The score maps obtained for parsing help estimate the locations and scales for human instances and their parts. With the predicted locations and scales, our model "zooms" the region into a right scale to further refine the parsing. In practice, we perform the two tasks iteratively so that detailed human parts are gradually recovered. We conduct extensive experiments over the challenging PASCAL-Person-Part segmentation, and show our approach significantly outperforms the state-of-art parsing techniques especially for instances and parts at small scale.
An Extended Isgur-Paton Model: Agreement With the Lattice?  [PDF]
R. W. Johnson,M. Teper
Physics , 1997, DOI: 10.1016/S0920-5632(97)00720-2
Abstract: The spectrum for the pure gauge sector is calculated for an extended Isgur-Paton model in 2+1 and 3+1 dimensions and compared to recent lattice calculations of the glueball spectrum. The IP model is extended by inclusion of a rigidity (curvature) term and, in D=2+1, mixing through a higer topological contribution. For a choice of parameterizations, near quantitative agreement is found for SU(3) in D=2+1, but in D=3+1 the extensions fail to remedy the qualitative disagreement.
Religion, literature and identity in South Africa: the case of Alan Paton  [cached]
D. Levey
Koers : Bulletin for Christian Scholarship , 2007, DOI: 10.4102/koers.v72i1.192
Abstract: This article draws on recent research into the early unpublished work of Alan Paton to suggest that the interrelationship of (English-language) literature and religion in South Africa is a much under-researched field despite numerous examples of such research elsewhere. One short case study based on Paton’s lecture on “God in modern thought” (1934) is offered. The value of a hermeneutic approach to literature that considers human identity in terms of incarnation, for example, is briefly argued and other possibilities suggested.
Glueball Spectra of SU(2) Gauge Theories in 3 and 4 Dimensions: A Comparison with the Isgur-Paton Flux Tube Model  [PDF]
T. Moretto,M. Teper
Physics , 1993,
Abstract: We use the results of recent lattice calculations to obtain (part of) the mass spectrum of continuum SU(2) gauge theory in both 2+1 and 3+1 dimensions. We compare these spectra to the predictions of the Isgur-Paton flux tube model for glueballs. We use this comparison to test the reliability of different aspects of the model and also to learn which aspects of the lattice calculations it is important to improve upon.
Non-commutative Space And Chan-Paton Algebra In Open String Field Algebra  [PDF]
Kazuyuki Furuuchi
Physics , 2002, DOI: 10.1016/S0550-3213(02)00486-8
Abstract: There are several equivalent descriptions for constant B-field background of open string. The background can be interpreted as constant B-field as well as constant gauge field strength or infinitely many D-branes with non-commuting Chan-Paton matrices. In this article, the equivalence of these open string theories is studied in Witten's cubic open string field theory. Through the map between these equivalent descriptions, both algebra of non-commutative coordinates as well as Chan-Paton matrix algebra are identified with subalgebras of open string field algebra.
Resensie: "Die see"
A van Jaarsveld
Tydskrif vir letterkunde , 2012,
Abstract: Die see. Reza de Wet. Pretoria: Protea Boekhuis. 2011. 75 pp. ISBN: 978-1-86919-520-5.
Can One See the Number of Colors?  [PDF]
O. Baer,U. -J. Wiese
Physics , 2001, DOI: 10.1016/S0550-3213(01)00288-7
Abstract: We formulate the standard model with an arbitrary number of colors N_c. The cancellation of Witten's global SU(2)_L anomaly requires N_c to be odd, while the cancellation of triangle anomalies determines the consistent N_c-dependent values of the quark charges. In this theory, the width of the neutral pion decay into two photons is not proportional to (N_c)^2. In fact, in the case of a single generation and hence for two quark flavors (N_f = 2), N_c does not appear explicitly in the low-energy effective theory of the standard model. Hence, contrary to common lore, it is impossible to see the number of colors in low-energy experiments with just pions and photons. For N_f > 2, on the other hand, N_c explicitly enters the chiral Lagrangian as the quantized prefactor of the Wess-Zumino-Witten term, but the contribution of this term to photon-pion vertices is completely canceled by the N_c-dependent part of a Goldstone-Wilczek term. However, the width of the eta decay into pi^+ pi^- gamma survives the cancellation and is indeed proportional to (N_c)^2. By detecting the emerging photon, this process thus allows one to literally see N_c for N_f > 2.
An Alternative to See-Saw  [PDF]
J. I. Silva-Marcos
Physics , 1998,
Abstract: We give a new mechanism for generating very small, and almost degenerate, neutrino masses, without resorting to the see-saw mechanism or unnatural small Yukawa couplings. It requires the existence of at least 4 families with an almost democratic structure for the Yukawa couplings. It is also proven that this structure can account for large lepton mixings of the three light leptons.
Do Artists See Their Retinas?  [PDF]
Florian Perdreau,Patrick Cavanagh
Frontiers in Human Neuroscience , 2011, DOI: 10.3389/fnhum.2011.00171
Abstract: Our perception starts with the image that falls on our retina and on this retinal image, distant objects are small and shadowed surfaces are dark. But this is not what we see. Visual constancies correct for distance so that, for example, a person approaching us does not appear to become a larger person. Interestingly, an artist, when rendering a scene realistically, must undo all these corrections, making distant objects again small. To determine whether years of art training and practice have conferred any specialized visual expertise, we compared the perceptual abilities of artists to those of non-artists in three tasks. We first asked them to adjust either the size or the brightness of a target to match it to a standard that was presented on a perspective grid or within a cast shadow. We instructed them to ignore the context, judging size, for example, by imagining the separation between their fingers if they were to pick up the test object from the display screen. In the third task, we tested the speed with which artists access visual representations. Subjects searched for an L-shape in contact with a circle; the target was an L-shape, but because of visual completion, it appeared to be a square occluded behind a circle, camouflaging the L-shape that is explicit on the retinal image. Surprisingly, artists were as affected by context as non-artists in all three tests. Moreover, artists took, on average, significantly more time to make their judgments, implying that they were doing their best to demonstrate the special skills that we, and they, believed they had acquired. Our data therefore support the proposal from Gombrich that artists do not have special perceptual expertise to undo the effects of constancies. Instead, once the context is present in their drawing, they need only compare the drawing to the scene to match the effect of constancies in both.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.