Showing papers by "Istanbul University published in 1971"
101 citations
TL;DR: Different units in the stratum griseum et fibrosum superficiale of the tectal cortex are all sensitive to stationary and moving stimuli and all have very small (2–3 degrees in diameter) visual receptive fields.
Abstract: Electrical responses of the cells at different depths of the pigeon's optic tectum to different visual stimuli were recorded.
Point to point representation of the upper visual field on the dorsal surface of the tectum was obtained as a projection on a horizontal stereotaxic plane.
Different units in the stratum griseum et fibrosum superficiale of the tectal cortex are all sensitive to stationary and moving stimuli and all have very small (2–3 degrees in diameter) visual receptive fields. The most noticeable difference between units from the superficial sublayers of the stratum griseum et fibrosum superficiale and those from the deeper sublayers of the stratum griseum et fibrosum superficiale is that the deeper units show much more rapid habituation to repetitive stationary stimuli, while they remain equally sensitive to all types of moving visual stimuli. All the units in the stratum griseum centrale are either insensitive to stationary stimuli or habituate very rapidly to them. They are very sensitive to moving stimuli. These movement detectors have large receptive fields mostly rectangular in shape with long axes vertical or horizontal but never oblique.
The nucleus isthmi showed different types of special units all with large receptive fields, the majority of which had indefinite boundaries. A small group had sharp boundaries and rectangular fields and resembled those seen in the stratum griseum centrale. These units are insensitive to stationary target and habituate very rapidly to steadily moving targets. Some of them behave as if they were sensitive to more complex types of movement.
27 citations
TL;DR: The homoeostatic equilibrium which in young normal individuals exists between the response of coagulation and that of fibrinolysis to exercise, tends to disappear with increasing age and with the occurrence of atherosclerotic complications.
17 citations
15 citations
14 citations
12 citations
8 citations
TL;DR: New transformations are given which make it possible to transform a given signal-flow graph to any other one with the same nodes and the same node variables, useful in network synthesis by signal- flow graphs.
Abstract: New transformations are given which make it possible to transform a given signal-flow graph to any other one with the same nodes and the same node variables. Such transformations are useful in network synthesis by signal-flow graphs.
8 citations
TL;DR: An examination of the postlarvae of the goby Lebetus Winther collected in the neighbourhood of Plymouth shows that there are two forms, separable on degree of development of the fins, meristic characters and body proportions.
Abstract: An examination of the postlarvae of the goby Lebetus Winther collected in the neighbourhood of Plymouth shows that there are two forms, separable on degree of development of the fins, meristic characters and body proportions. The differences are sufficient to indicate that there must be two species whose identity can only be made certain by rearing, since the original two species L. orca (Collett) and L. scorpioides (Collett) have recently been regarded as one species showing sexual dimorphism.
6 citations
01 Dec 1971
TL;DR: A new synthesis procedure for the realization of low-sensitivity active RC circuits composed of resistors, capacitors, and operational amplifiers is given using a new signal-flow graph representation for the biquadratic transfer functions.
Abstract: A new synthesis procedure for the realization of low-sensitivity active RC circuits composed of resistors, capacitors, and operational amplifiers is given using a new signal-flow graph representation for the biquadratic transfer functions.
5 citations
TL;DR: In this article, a new expansion for the signal-flowgraph determinant is presented, which gives the complete graph determinant in terms of the subgraph determinants and the loop gains, useful for the evaluation of the determinant when the signal flow graph is complicated and when there are many nontouching loops.
Abstract: A new expansion for the signal-flowgraph determinant is presented, which gives the complete graph determinant in terms of the subgraph determinants and the loop gains. This expansion is useful for the evaluation of the determinant when the signal flowgraph is complicated and when there are many nontouching loops.
TL;DR: In this article, the components of the finite displacements, rotations and stress resultants of a thin elastic rod with inextensible axis were determined by using three-dimensional kinematics of a rigid body.
Abstract: By using three-dimensional kinematics of a rigid body, the components of the finite displacements, rotations and stress resultants of a thin elastic rod with inextensible axis are determined.
TL;DR: A well documented case of granulosa cell tumor associated with pregnancy is presented and the paucity of the reports justifies publication of case reports.
01 Jul 1971
TL;DR: In this paper, the apparent viscosity of a polar fluid with suspensions of rigid spherical particles undergoing a prescribed bulk motion is calculated, and it is shown that the increased rate of dissipation in a polar liquid with suspensions is greater than that of a Newtonian fluid.
Abstract: The apparent viscosity of a polar fluid with suspensions of rigid spherical particles undergoing a prescribed bulk motion is calculated. It is shown that the increased rate of dissipation in a polar fluid with suspensions is greater than that of a Newtonian fluid. It is found that the relationship between the viscosity and the concentration has a same form with that of a Newtonian fluid suspension of which ambient fluid has a shear viscosity multiplied by a factor which is greater than unity.
TL;DR: In this article, a theorem is proved which gives the immittance functions of the ladder network of which the voltage transfer function is to be realized, and then the realisation of a given voltage transfer functions by the use of this theorem is illustrated.
Abstract: Using signal-flow graphs, a theorem is proved which gives the immittance functions of the ladder network of which the voltage transfer function is to be realised, and then the realisation of a given voltage transfer function by the use of this theorem is illustrated.
TL;DR: In this paper, the authors studied the geomagnetic field with periods between 40 sec and 150 sec at Istanbul for the years from 1953 to 1969 and found that the maximum occurrence frequencies of Pi2 and bp changes from month to month, and year to year between 2100 hr and 0200 hr LT.
TL;DR: By using Coates's flowgraphs, a new approach to operational-amplifier?RC-network synthesis is given in this article, where the general biquadratic voltage transfer function is realized by this method.
Abstract: By using Coates's flowgraphs, a new approach to operational-amplifier?RC-network synthesis is given. The general biquadratic voltage transfer function is realised by this method. Furthermore, it is shown by an illustrative example that obtaining any other desirable transfer function directly from this realisation is possible.