Error Estimation in Numerical Inversion of Laplace Transforms Using Padé Approximation     

Yudell L. Luke 《Journal of The Franklin Institute》1978,305(5):259-273

Uniform asymptotic estimates for the error in the main diagonal and first two subdiagonal Padé approximants for exp(iz) in a sector covering the real z axis are derived. The results are applied to analyze the error in a cerain procedure for the numerical inversion of the Laplace transform.  相似文献   

Modeling of Star-shaped and Parallel-wire Carrier Distribution Systems     

C. Yeh  F. Manshadi  G. Mariki  W.P. Brown 《Journal of The Franklin Institute》1978,305(2):67-78

It is often desirable to represent carrier distribution systems by networks so that analysis can be made to predict the behavior of these systems. Modeling of two canonical carrier distribution systems, the star-shaped system and the parallel-wire system by networks was carried out in this paper. The representation is given in terms of lumped parameters when the lengths of the carrier lines are short and it is given in terms of lumped and distributed parameters when the lengths of the carrier lines are long.  相似文献   

Effects of social comparison on aggression and regression in groups of young children.     

J W Santrock  P C Smith  P E Bourbeau 《Child development》1976,47(3):831-837

The influence of negative, equal, and positive social comparison and of nonsocial comparison upon 4- and 5-year-old black children's subsequent aggressive and regressive behavior in 3-member groups was investigated. The group behavior of boys included more physical agression following negative social comparison than the other treatments, and their group behavior also consisted of more nonverbal teasing behavior following the negative comparison treatment than that of the equal and nonsocial comparison groups. When the behavior of the nontarget partners was controlled, children initiated more physical aggression, nonverbal teasing, and regression after experiencing negative social comparison with the partners than after following the other treatments. There was some evidence to support the reciprocal influence of children's aggressive behavior on each other, particularly for boys following imbalanced social comparison treatments.  相似文献   

Infant approach behavior as related to attachment.     

R L Tracy  M E Lamb  M D Salter Ainsworth 《Child development》1976,47(3):571-578

The chief purpose of this study was to identify characteristics that distinguish approach as an attachment behavior from approach serving other behavioral systems. Locomotor approaches of 16 male and 10 female white middle-class infants to an attachment figure (the mother) and to a nonattachment figure (the visitor-observer) were examined under naturalistic conditions at home. Observations were made during 4-hour home visits at 3-week intervals; those from 26 to 54 weeks were used. When approach was examined in a free-choice situation and without regard to behavioral context, infants approached the mother proportionally (though slightly) more often than the visitor (p less than .05). In 2 behavioral contexts, however, spontaneous infant approaches were sharply differential to the mother; approaches accompanied by crying and approaches terminating in a pickup appeal were directed almost exclusively to the mother (p less than .0001 for both). Touching upon completion of the approach was not differential, except in the context of a pickup appeal. Object-oriented approaches were more often directed to the visitor than to the mother (p less than .002) and may be either exploratory or affiliative. It is suggested that neither approach nor touching can be assumed to serve the attachment system without consideration of context- both environmental and behavioral.  相似文献   

The relative efficacy of vestibular-proprioceptive stimulation and the upright position in enhancing visual pursuit in neonates.     

C L Gregg  M E Haffner  A F Korner 《Child development》1976,47(2):309-314

48 healthy neonates born to multiparae were randomly assigned to view a moving stimulus either in the horizontal or the upright position, with or without added vestibular stimulation and with or without pacifier sucking. The infant was shown a moving black line inside a strictly controlled visual environment provided by an apparatus which permitted horizontal and upright positioning and displacement of the infant. Visual tracking was recorded by a concealed TV camera positioned at a constant distance and angle from the infants' eyes in both positions. Quality of tracking during each of 4 trials was scored on a 7-point scale. Results indicate that vestibularproprioceptive stimulation provided to the infant either horizontally or semivertically significantly enhanced his visual tracking, whereas the upright position did not. Pacifier sucking also improved his performace.  相似文献   

Book review     

Jon Lauglo  C. H. Dobinson  Wolfgang Mitter  Ian Lister  G. W. Parkyn  T. Neville Postlethwaite  R. Gardner  Walter Hahn  John Lowe  A. J. Cropley  Georges Belbenoit  Janusz J. Tomiak  Bill Halls 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1976,22(1):107-126

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The Colombian national apprenticeship service (SENA)     

Armando N. L. Negri 《Prospects》1976,6(2):240-244

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Reviews     

K. A. Percy  George Psacharopoulos  Johan P. Olsen  Michalina Vaughan  Leslie Purdy  K. C. Mukherjee  Max Streit  D. J. Hounsell  Marvin W. Peterson 《Higher Education》1974,3(4):473-478

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Book reviews     

Walter Hahn  Helmut Skowronek  H. J. Butcher  Hans-Martin Müller-Wolf  J. C. Cairns  Michael Angermaier  Maureen Woodhall  Ha Wun Sung  Oskar Anweiler  John A. Smyth  Gilbert de Landsheere  Gaby Venstermans  Erika Voigt  Anza Amen Lema  David Wolsk  Robert O. Berdahl 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1974,20(1):83-107

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Stability analysis of nonlinear control systems with characteristics equations having complex coefficients     

Y.T. Tsay  B.C. Wang  K.W. Han 《Journal of The Franklin Institute》1974,297(3):179-186

In this paper, the stability equation method is applied to the analysis of nonlinear systems with characteristics equations having complex coefficients. Three types of systems are studied: those with unstable open-loop poles, unstable characteristics roots or an equal number of open-loop poles and zeros.  相似文献