scholarly journals Low-frequency Profiles of the Crab Pulsar

2002 ◽  
Vol 199 ◽  
pp. 379-380
Author(s):  
Arkady Kuzmin
Keyword(s):  
Low Frequency ◽  
Main Pulse ◽  
Crab Pulsar ◽  
Component Structure ◽  
Two Component ◽  
Interstellar Scattering

Integrated profiles of the Crab pulsar at frequencies 102, 111, 127, 147, and 196 MHz compensated for the interstellar scattering are presented. Observed profiles were compensated for interstellar scattering and intrinsic pulsar profiles were restored. The component structure and their frequency evolution was analyzed. The main pulse is two-component and a so-called precursor is its first component. The interpulse have two components too.

scholarly journals The Relation of the Low Frequency Source to the Crab Pulsar

1971 ◽  
Vol 46 ◽  
pp. 91-96
Author(s):  
Kenneth R. Lang
Keyword(s):  
Angular Size ◽  
Low Frequency ◽  
Crab Pulsar ◽  
Compact Source ◽  
General Properties ◽  
Interstellar Scattering ◽  
Frequency Source ◽  
Pulse Broadening ◽  
The Continuum

The view that the compact low frequency source and the pulsar NP 0532 are the same object is substantiated by an examination of the general properties of interstellar scattering. This scattering accounts for the observed angular size of the compact source, the observed pulse broadening of NP 0532, the continuum nature of the compact source, and the observed spectrum of both the pulsar and the compact source.

scholarly journals A possible two-component structure of the non-perturbative Pomeron

2000 ◽  
Vol 486 (1-2) ◽  
pp. 71-76 ◽  
Author(s):  
Pierre Gauron ◽  
Basarab Nicolescu
Keyword(s):  
Component Structure ◽  
Two Component

scholarly journals Dynamics of the concept CANADA in English-Canadian poetic texts of the 18th–21st centuries

2019 ◽  
Keyword(s):  
Structural Components ◽  
Canadian History ◽  
Component Structure ◽  
Cognitive Characteristics ◽  
Two Component ◽  
Poetic Texts ◽  
English Canadian ◽  
Historical Periods ◽  
Cultural Features ◽  
Selection Of

The article deals with the trends of historical dynamics of linguistic and cognitive characteristics of the concept Canada in English-Canadian poetic texts of the 18th–21st centuries. This research deploys a complex semantic and cognitive analysis of its lexical-semantic nominative means of poetic texts. As a result specific features of national, cultural and author’s knowledge encoded in the poetic texts are identified and classified. The lexical nominative means of the concept Canada are viewed in terms of two groups of nominative means: direct and figurative. All the nominations are classified according to several criteria. Direct and figurative nominative means of the concept Canada variously characterize physical, geographical, territorial, demographic, social, political, historical, and cultural features of the Canadian state. The variability in priority of thematic nomination groups of the concept Canada in different historical periods of the statehood formation reveals the influence of the extralingual factors on the authors’ selection of nominative means of the concept Canada. The concept Canada combines the features of both a literary, cultural and a toponymic concept. It has been modeled as a complex two-component structure that includes a sensory-notional and a figurative component. Historically conditioned transformations of the structural components of the concept Canada is interpreted in terms of its invariant and diachronically variable linguistic and cognitive characteristics. During three periods of Canadian history, the transformations of the structural components of the concept Canada reveal themselves as either the hierarchic shifts of the literary concepts-slots in the sensory-notional component or as the variability of the set of conceptual metaphors in its figurative component.

Personal Disturbance Scale: Factor Structure Confirmed in a Large Nonclinical Sample

2005 ◽  
Vol 96 (1) ◽  
pp. 107-108 ◽  
Author(s):  
Alan Bedford ◽  
J. D. Henry ◽  
J. R. Crawford
Keyword(s):  
Clinical Study ◽  
Factor Structure ◽  
Short Form ◽  
Psychiatric Patients ◽  
Scale Factor ◽  
Anxiety And Depression ◽  
Component Structure ◽  
Two Component ◽  
Nonclinical Sample

The two-component structure of anxiety and depression items of the short form Personal Disturbance Scale, reported in an earlier clinical study of 480 adult psychiatric patients, was substantially replicated in a large nonclinical sample of 758 adults.

Plural marking patterns of nouns and their associates in the world’s languages

2020 ◽  
Vol 44 (1) ◽  
pp. 231-269
Author(s):  
Rong Chen
Keyword(s):  
Machine Learning ◽  
Logistic Regression ◽  
Learning Algorithm ◽  
Machine Learning Algorithm ◽  
Data Set ◽  
Component Structure ◽  
Universal Distribution ◽  
Two Component ◽  
The World ◽  
Plural Marking

Abstract Plural marking reaches most corners of languages. When a noun occurs with another linguistic element, which is called associate in this paper, plural marking on the two-component structure has four logically possible patterns: doubly unmarked, noun-marked, associate-marked and doubly marked. These four patterns do not distribute homogeneously in the world’s languages, because they are motivated by two competing motivations iconicity and economy. Some patterns are preferred over others, and this preference is consistently found in languages across the world. In other words, there exists a universal distribution of the four plural marking patterns. Furthermore, holding the view that plural marking on associates expresses plurality of nouns, I propose a hypothetical universal which uses the number of pluralized associates to predict plural marking on nouns. A data set collected from a sample of 100 languages is used to test the hypothetical universal, by employing the machine learning algorithm logistic regression.

Low Frequency (327 MHz) VLBI Survey: First Results

1998 ◽  
Vol 164 ◽  
pp. 141-142 ◽  
Author(s):  
V. Altunin ◽  
A. Beasley ◽  
E. Lűdke ◽  
V. Alekseev ◽  
B. Lipatov ◽  
...  
Keyword(s):  
Preliminary Data ◽  
Low Frequency ◽  
Potential Candidate ◽  
Scattering Medium ◽  
Interstellar Scattering ◽  
The Future ◽  
First Results

AbstractIn this paper we report the first results of the 327 MHz VLBI survey which has been carried out in the last two years to select potential candidate sources for the future SVLBI missions and to search for directions of small scattering-“holes” in the interstellar scattering medium. During the three VLBI sessions conducted so far, we observed about 80 sources. Preliminary data analyzed from the first part of the survey shows that at least 17 out of 50 sources have compact components with a size smaller than 30 mas.

Edge Computation in Human Vision: Anisotropy in the Combining of Oriented Filters

Perception ◽  
1995 ◽  
Vol 24 (6) ◽  
pp. 603-622 ◽  
Author(s):  
Tim S Meese ◽  
Tom C A Freeman
Keyword(s):  
Spatial Structure ◽  
Spatial Frequency ◽  
Human Vision ◽  
Contrast Effects ◽  
Compound Structure ◽  
Component Structure ◽  
Zero Crossings ◽  
Coding Scheme ◽  
Two Component ◽  
Sinusoidal Gratings

Above threshold, two superimposed sinusoidal gratings of the same spatial frequency (eg 1 cycle deg−1) and equal contrasts, and with orientations balanced around vertical, usually look like a compound structure containing vertical and horizontal edges. However, at large plaid angles (ie large differences between component orientations) and low plaid contrasts there is a tendency for the stimulus to appear as two overlapping gratings (component structure) with obliquely oriented edges. These dependencies of perceived spatial structure in plaids are incompatible with an edge-coding scheme that uses only circular filters to compute zero-crossings, but instead support the idea that different oriented filters can (compound percept) or cannot (component percept) be combined before edges are represented. Here, further evidence is presented in support of this hypothesis. Two-component plaid stimuli had plaid angles of 45° or 90°, and a range of plaid orientations (ie a range of orientations around which the plaid components were balanced). Observers indicated whether each stimulus was perceived as a compound or component structure for a range of plaid contrasts. In addition to angle and contrast effects, perceived spatial structure was also found to depend on plaid orientation: compound structures were perceived more often when the plaid components were balanced around the cardinal axes of the retina. It is suggested that the principles governing the combination of oriented-filter outputs might be learnt during the development of the visual system by using a Hebb-type rule: coactivated filters are more likely to combine their outputs when activated on future occasions. Given the prominence of vertical and horizontal orientations in a carpentered environment, this simple rule promotes a network that combines filters balanced around cardinal axes more readily than oblique axes, in agreement with the results.

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