A new active R bandpass filter     

Ahmed M. Soliman  Mahmoud Fawzy 《Journal of The Franklin Institute》1978,306(2):159-163

A new active R filter which realizes a second order bandpass transfer function is given. The network employs only resistors and two operational amplifiers. Sensitivities to all passive and active circuit components are very low. Design equations are given and experimental results are also included.  相似文献   

Software design for microprocessors: by J. G. Webster and W. D. Simpson 373 pp. diagrams,illus., 6×9 in., Texas Instruments Corp., Dallas, 1976     

M.E. Sloan 《Journal of The Franklin Institute》1978,305(1):60-61

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Structural analysis,a unified classical and matrix approach: By A. Ghali and A. M. Neville. Pp.779. Chapman & Hall. 1978. £8.50     

W.M Jenkins 《Endeavour》1978,2(3):149-150

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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   

Self-evaluation, social reinforcement, and academic achievement of black and white schoolchildren.     

I Katz  O J Cole  R M Baron 《Child development》1976,47(2):368-374

Black and white male schoolchildren covertly evaluated their own performance at a verbal task administered by black and white male experimenters. It was hypothesized that academically successful children would be predisposed to appraise themselves favorably, whereas relatively unsuccessful pupils would be biased toward self-criticism. The covert self-evaluations were assumed to represent at internalization of early experiences of predominantly positive or negative social reinforcement from adult socializing agents. The predicition for self-criticism was upheld in the white experimenter condition but not in the black experimenter condition. Relationships consistent with the theory were found between subjects' self-appraisals and their retrospective reports of positive and negative reinforcements received from parents and teachers in various typical situations. These relationships were more evident for black subjects than for white subjects. The extent to which children's self-praise and self-criticism mediated affect was assessed by means of a color conditioning technique. Contrary to predicition, possibly due to the easy nature of the experimental task.  相似文献   

Preface     

R.M. Rosenberg 《Journal of The Franklin Institute》1974,297(5):315

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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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Augusto salazar bondy: In memoriam 8.12.1925–6.2.1974     

M. Dino Carelli 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1974,20(2):115-116

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Transient dipole radiation in an absorbing uniaxial crystal     

Ioannis M. Besieris 《Journal of The Franklin Institute》1974,297(4):243-258

The electromagnetic radiation arising from a longitudinally and a transversely oriented magnetic dipole in a dissipative uniaxially anisotropic medium is determined by writing separate equations for the electromagnetic field intensities, and utilizing a spectral representation in the space-time Fourier domain. It is established that explicit, time- dependent, analytical solutions are possible in the case where the permitivity, permeability and conductivity tensors are simultaneously diagonalizable by means of a collineatory transformation, and the permittivity and conductivity tensors are directly proportional to each other.  相似文献