The Fourier theorem     

Raimond A. Struble 《Journal of The Franklin Institute》1978,306(1):63-76

It has been tacitly understood that Fourier's representation theorem applies only to a very restricted class of functions. On the contrary, by adopting an appropriate algebraic viewpoint, it is explained in this article how the theorem can be readily extended to include all (non-pathological) functions.  相似文献   

Inflammation     

Derek A. Willoughby 《Endeavour》1978,2(2):57-65

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Perspective on parental involvement in the diagnosis and treatment of learning disabled children     

J A McLoughlin  D Edge  B Strenecky 《Journal of learning disabilities》1978,11(5):291-296

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Perforation of Nonlocal Visco- Plastic Plates by a Cylindrical Projectile     

Hilmi Demiray  A. Cemal Eringen 《Journal of The Franklin Institute》1978,306(3):209-224

This paper is concerned with the analysis of the problem of dynamic perforation of visco-plastic plates by a cylindrical projectile, leading to a failure of the plate by a plug formation. Assuming the behavior of the plate material is nonlocal visco-plastic, the classical theory of visco-plasticity for Bingham solids is generalized to take the non-local effects into consideration. The target plate being thin, it is assumed that only the contributions of vertical shearing stress need be taken into account. The effect of the impact is represented by a uniform velocity distribution over a circular region of the plate surface. The expressions of velocity, strain rate and shear stress are obtained and some particular cases are discussed. Some numerical results concerning stress distributions are also included.  相似文献   

Physics and engineering of high power switching devices : Thomas H. Lee. 542 pages,diagrams, 6x9 in., MIT Press,Cambridge, Mass., 1975. Price, $25.00.     

Stephen A. Sebo 《Journal of The Franklin Institute》1978,306(5):375-376

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Infant visual acuity as a function of viewing distance.     

P Salapatek  A G Bechtold  E W Bushnell 《Child development》1976,47(3):860-863

Dynamic retinoscopy has suggested that near vision may be more acute than far vision during early infancy. To test this, acuity thresholds were determined by presenting square wave gratings in a preference paradigm to 1- and 2-month-old human infants at 4 viewing distances. Gratings were paired with unpatterned fields; direction of first fixation was the dependent measure. Infants exhibited the same acuity at each of the distances at which gratings were presented. The results were interpreted as compatible with the fact that considerable optical defocusing does not seriously affect a visual system, such as the infant's, that is sensitive only to low spatial frequencies.  相似文献   

Radial localization of odors by human newborns.     

J Rieser  A Yonas  K Wikner 《Child development》1976,47(3):856-859

To study sensitivity to radial location of an odor source, 20 human newborns, ranging from 16 to 130 hours of age, were presented with a small amount of ammonium hydroxide. The odor source was placed near the nose slightly to the left or right of midline, with its position randomized over repeated trails. Direction of headturn with respect to the odor location and diffuse motor activity were scored from the videotape recordings of the newborns' behavior. It was found that as a group, the newborns turned away from the odor source more frequently than they turned toward it. The tendency to turn away from the odor was stronger in infants who displayed less motor activity after the response. Newborns also exhibited a right bias in the direction of the head movements. It is concluded that a spatially appropriate avoidance response is present in the neonate and that the newborn is innately sensitive to the radial location of an odor.  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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Adjacency matrix concepts for the analysis of the interconnection of networks     

William N. Anderson  Richard J. Duffin  George E. Trapp 《Journal of The Franklin Institute》1974,298(1):9-27

A mathematical theory is developed for an imagined device termed a “junctor”. A junctor could be used to interconnect two n-terminal networks giving rise to another n-terminal network. Actually a junctor is itself a simple network with three banks of n-terminals internally connected in some fashion by perfectly conducting wires. Adjacency matrices are formulated to analyze various junctors and their current flows. The main problem treated concerns conditions which would ensure that the junctor operation is associative.  相似文献