scholarly journals World-line condition and the noninteraction theorem

1985 ◽  
Vol 31 (2) ◽  
pp. 314-318 ◽  
Author(s):  
F. Marquès ◽  
V. Iranzo ◽  
A. Molina ◽  
A. Montoto ◽  
J. Llosa
Keyword(s):  
World Line ◽  
Line Condition

Forms of relativistic dynamics with World Line Condition and separability

1983 ◽  
Vol 13 (3) ◽  
pp. 385-393 ◽  
Author(s):  
E. C. G. Sudarshan ◽  
N. Mukunda
Keyword(s):  
World Line ◽  
Relativistic Dynamics ◽  
Line Condition

World-line condition for a spinning particle in superspace

1984 ◽  
Vol 82 (1) ◽  
pp. 17-28 ◽  
Author(s):  
J. Gomis ◽  
P. Mato ◽  
M. Novell
Keyword(s):  
World Line ◽  
Spinning Particle ◽  
Line Condition

scholarly journals Descriptions of Relativistic Dynamics with World Line Condition

2019 ◽  
Vol 1 (2) ◽  
pp. 181-192 ◽  
Author(s):  
Florio Maria Ciaglia ◽  
Fabio Di Cosmo ◽  
Alberto Ibort ◽  
Giuseppe Marmo
Keyword(s):  
Tangent Bundle ◽  
Vector Fields ◽  
World Line ◽  
Poisson Brackets ◽  
Relativistic Dynamics ◽  
Geometrical Analysis ◽  
Poincaré Algebra ◽  
Algebra Versus ◽  
Line Condition

In this paper, a generalized form of relativistic dynamics is presented. A realization of the Poincaré algebra is provided in terms of vector fields on the tangent bundle of a simultaneity surface in R 4 . The construction of this realization is explicitly shown to clarify the role of the commutation relations of the Poincaré algebra versus their description in terms of Poisson brackets in the no-interaction theorem. Moreover, a geometrical analysis of the “eleventh generator” formalism introduced by Sudarshan and Mukunda is outlined, this formalism being at the basis of many proposals which evaded the no-interaction theorem.

The kinematics of a point particle

2018 ◽  
Author(s):  
Nathalie Deruelle ◽  
Jean-Philippe Uzan
Keyword(s):  
Internal Structure ◽  
Proper Time ◽  
World Line ◽  
Point Particle ◽  
Material Point ◽  
Spatial Extent ◽  
Geometric Representation ◽  
Mathematical Result ◽  
Point Particles ◽  
The World

This chapter discusses the kinematics of point particles undergoing any type of motion. It introduces the concept of proper time—the geometric representation of the time measured by an accelerated clock. It also describes a world line, which represents the motion of a material point or point particle P, that is, an object whose spatial extent and internal structure can be ignored. The chapter then considers the interpretation of the curvilinear abscissa, which by definition measures the length of the world line L representing the motion of the point particle P. Next, the chapter discusses a mathematical result popularized by Paul Langevin in the 1920s, the so-called ‘Langevin twins’ which revealed a paradoxical result. Finally, the transformation of velocities and accelerations is discussed.

Internet/Intranet Based Remote Condition Monitoring and Fault Diagnosis Scheme and System for Steam Turboset

2005 ◽  
Vol 293-294 ◽  
pp. 365-372 ◽  
Author(s):  
Yong Yong He ◽  
Wen Xiu Lu ◽  
Fu Lei Chu
Keyword(s):  
Fault Diagnosis ◽  
Power System ◽  
Electric Power ◽  
Condition Monitoring ◽  
Economic Benefits ◽  
Electric Power System ◽  
The Internet ◽  
Time Data ◽  
On Line ◽  
Line Condition

The steam turboset is the key equipment of the electric power system. Thus, it is very important and necessary to monitor and diagnose the running condition and the faults of the steam turboset for the safe and normal running of the electric power system. In this paper, the Internet/Intranet based remote condition monitoring and fault diagnosis scheme is proposed. The corresponding technique and methods are discussed in detail. And a real application system is developed for the 300MW steam turboset. In this scheme, the system is built on the Internet/Intranet and the Client/Server construction and Web/Server model are adopted. The proposed scheme can guarantee real-time data acquisition and on-line condition analysis simultaneously. And especially, the remote condition monitoring and fault diagnosis can be implemented effectively. The developed system has been installed in a power plant of China. And the plant has obtained great economic benefits from it.

Do word learners ignore ignorant speakers?

2003 ◽  
Vol 30 (4) ◽  
pp. 905-924 ◽  
Author(s):  
MARK A. SABBAGH ◽  
SYLWIA D. WDOWIAK ◽  
JENNIFER M. OTTAWAY
Keyword(s):  
Word Learning ◽  
Base Line ◽  
The Novel ◽  
Experimental Conditions ◽  
Knowledge States ◽  
Children First ◽  
Line Condition

Thirty-six three- to four-year-old children were tested to assess whether hearing a word-referent link from an ignorant speaker affected children's abilities to subsequently link the same word with an alternative referent offered by another speaker. In the principal experimental conditions, children first heard either an ignorant or a knowledgeable speaker link a novel word with one of three toys. The first speaker's labelling episode was followed by a second in which a different speaker used the same novel label but for a different toy. There was also a Base-line condition which was the same as the experimental condition involving the ignorant speaker except that she did not associate the novel label with a referent. When tested for comprehension of the novel label, children selected the FIRST speaker's toy at high levels when the first speaker was knowledgeable, but selected the SECOND speaker's toy when the first speaker was ignorant. These findings suggest that children's experience with the ignorant speaker did not affect their abilities to learn a subsequently presented alternative word-referent link. These findings are discussed in terms of understanding the mechanisms by which children adapt their word-learning in line with speakers' knowledge states.

scholarly journals Object closure affects the strength of object-based attentional filtering

2018 ◽  
Author(s):  
Grace Nicora ◽  
Adam Greenberg
Keyword(s):  
Discrimination Task ◽  
Attention Control ◽  
Target Response ◽  
Central Target ◽  
Object Based ◽  
Flanker Paradigm ◽  
Selection Experiments ◽  
Perceptual Objects ◽  
Line Condition ◽  
Singleton Target

Shifts of object-based attention (OBA) are affected by object closure in the double-rectangle cueing paradigm (Marino & Scholl, 2005). The effect of closure on object-based selection and attentional filtering strength have not previously been investigated. Using a modified flanker paradigm (Eriksen & Eriksen, 1974), we presented subjects either a set of vertically oriented rectangles (rectangle condition) or those same rectangles with the horizontal top/bottom of each rectangle removed (line condition). In Experiments 1 & 2, a centrally presented object was flanked by four identical objects. One end of the central (target containing) object was then exogenously cued. Subjects performed a letter discrimination task on a color singleton target letter appearing on the central object in the presence of flanker letters (on flanking objects) that were either compatible or incompatible with the target response. Experiment 1 (homogeneously rectangle or line objects) showed that OBA selection is strong when objects are closed, preventing flankers from influencing performance. Experiment 2 (spatial attention control) showed that closure does not affect performance without OBA selection. Experiments 3 (flanking line objects) and 4 (flanking rectangle objects) showed that both target & flanking objects play a role in attentional filtering of distracters. During object-based attentional selection, flanking (non-selected) perceptual objects may serve to confine the effects of distracters while target (selected) perceptual objects may serve to shield the target from the effects of distracters.

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