Showing papers in "Electronics Letters in 1965"
TL;DR: A novel input/output device for computer systems has wires, sensitive to the touch of a finger, on the face of a cathode-ray tube on which information can be written by the computer.
Abstract: A novel input/output device for computer systems has wires, sensitive to the touch of a finger, on the face of a cathode-ray tube on which information can be written by the computer. This device, the 'touch display', provides a very efficient coupling between man and machine.
90 citations
TL;DR: In this paper, the frequency dependence of attenuation and phase change coefficients for various values of dielectric loss was investigated for two types of complex modes that exist in a Dielectric-Loaded Circular Waveguide.
Abstract: Computed results are presented for the two types of complex mode that exist in dielectric-loaded circular waveguide. The frequency dependence of attenuation and phase-change coefficients is shown for various values of dielectric loss. The implications of these results on devices employing this structure are discussed.
49 citations
TL;DR: In this article, a new spectrum was obtained with a mixture of deuterium and bromine cyanide, which was tentatively attributed to HnCN with n > 1.
Abstract: Stimulated emission at ten new wavelengths between 126 and 373?m was obtained with dimethylamine. The stronger lines were also obtained with seven related compounds and with several mixtures, notably methane and ammonia. A new spectrum (four lines between 181 and 205?m) was obtained with a mixture of deuterium and bromine cyanide. The radiation is tentatively attributed to HnCN with n >1.
42 citations
TL;DR: The problem of replacing ungrounded inductors with grounded gyrators and capacitors is solved and a practical example of a low-pass third-order elliptic-function filter is given.
Abstract: This communication describes the inversion property of the gyrator and how, by cascading RC sections with gyrators, the problem of replacing ungrounded inductors with grounded gyrators and capacitors is solved. A practical example of a low-pass third-order elliptic-function filter is given.
41 citations
TL;DR: In this paper, a linear combination of the outputs of the feedback shift register which generates a linear binary sequence is given for calculating the linear combination required to give a specified delayed version.
Abstract: Any delayed version of a linear binary sequence can be obtained from a suitable linear combination of the outputs of the feedback shift register which generates the sequence. A simple method is given for calculating the linear combination required to give a specified delayed version. The method involves polynomial long division, and is not restricted to short sequences.
40 citations
TL;DR: An empirical formula is proposed for predicting the subjective quality of television pictures degraded by two or more impairments simultaneously, given the quality grading for each impairment separately.
Abstract: An empirical formula is proposed for predicting the subjective quality of television pictures degraded by two or more impairments simultaneously, given the quality grading for each impairment separately. The formula leads to a further proposal for transforming subjective-impairment magnitudes into summable impairment units termed `imps?.
40 citations
TL;DR: In this article, an empirical equation is proposed to describe the temperature-dependent behavior of the forward characteristics of heterojunctions, and no satisfactory theoretical derivation of this equation is yet available.
Abstract: An empirical equation is put forward which describes the temperature-dependent behaviour of the forward characteristics of heterojunctions. No satisfactory theoretical derivation of this equation is yet available.
34 citations
TL;DR: In this paper, a new technique for determining the field at the surface of the earthed electrode of a gap subjected to an impulse voltage is described, and the results obtained when the technique is applied to the study of the field variation during the initial stages of spark breakdown in a rod-plane gap, showing, in particular, the influence of space charges.
Abstract: A new technique for determining the field at the surface of the earthed electrode of a gap subjected to an impulse voltage is described. An example is given of the results obtained when the technique is applied to the study of the field variation during the initial stages of spark breakdown in a rod-plane gap, showing, in particular, the influence of space charges.
30 citations
TL;DR: In this paper, a formula for calculating the sensitivity of an eigenvalue to changes in the matrix is given, where the sensitivity is defined in terms of the number of eigenvalues that can be reached.
Abstract: A formula is given for calculating the sensitivity of an eigenvalue to changes in the matrix.
29 citations
TL;DR: In this paper, a low-noise low-frequency parametric convertor was used as a preamplifier to measure the thermal noise produced by wire-wound resistors, two types of dry Leclanche batteries, and a carbon resistor.
Abstract: Using a low-noise low-frequency parametric convertor as a preamplifier, narrowband noise measurements have been carried out on wirewound resistors, two types of dry Leclanche batteries and two types of carbon resistor. Wire-wound resistors and one of the types of battery exhibited no measurable excess noise. An ordinary carbon resistor was found to produce 108 times its thermal noise at 3 c/s when passing 4A. The noise power produced by the second type of battery was linearly related to its current.
29 citations
TL;DR: The coding system described minimises the d.c. component in the transmitted binary signal by inverting characters when this will reduce the accumulated mark and space disparity.
Abstract: The coding system described minimises the d.c. component in the transmitted binary signal by inverting characters when this will reduce the accumulated mark and space disparity. An added digit indicates when inversion has taken place. Conversion to and from unrestricted binary coding is relatively simple.
TL;DR: In this paper, a mass-spectrometric reinvestigation of ionisation and dissociation in CF4 was undertaken to deduce the probable value of the CF3-F bond strength.
Abstract: A mass-spectrometric reinvestigation of ionisation and dissociation in CF4 was undertaken to deduce the probable value of the CF3–F bond strength. From studies of the appearance potentials for both positive and negative F and CF3 ions a best value for the bond strength of 143 kcal/mole is deduced. Possible reasons for the abnormal low dielectric strength of CF4 are discussed.
TL;DR: In this article, a transfer matrix is related to the differential equations of the underlying system, and a formula is given which relates the transfer matrix to the corresponding differential equations. But this formula is not applicable to the case of this article.
Abstract: A formula is given which relates a transfer matrix to the differential equations of the underlying system.
TL;DR: In this paper, the authors investigated the scattering of H-polarized plane waves by an infinitely long axially magnetized cylinder of uniform plasma. But the radius of the cylinder is small in comparison with the wavelength of the incident wave, and the scattering amplitude is found to be a maximum at two frequencies.
Abstract: The scattering of H-polarised plane waves by an infinitely long axially magnetised cylinder of uniform plasma is investigated for the case in which the radius of the cylinder is small in comparison with the wavelength of the incident wave. The scattering amplitude is found to be a maximum at two frequencies, which are shown to be related to the familiar dipolar resonant frequency of an isotropic plasma column. Approximate expressions for the two resonant frequencies are derived.
TL;DR: In this article, it was shown that a filamentary beam of monoenergetic electrons having a controlled amount of angular momentum and caused to traverse a Cuccia coupler can produce negative energy absorption near the cyclotron frequency, if relativistic effects are taken into account.
Abstract: It is shown that a filamentary beam of monoenergetic electrons having a controlled amount of angular momentum and caused to traverse a Cuccia coupler can produce negative energy absorption near the cyclotron frequency, if relativistic effects are taken into account. No threshold angular momentum for the onset of negative absorption is predicted.
TL;DR: In this paper, the compression of linear frequency-modulated S band pulses in an axially magnetized yttrium-iron-garnet rod was investigated and a factor of 72 was achieved with a 1 μs input pulse frequency modulated by 125 Mc/s.
Abstract: Experiments on the compression of linear frequency-modulated S band pulses in an axially magnetised yttrium-iron-garnet rod are reported. The specimen was operated at room temperature in the magnetoelastic one-port delay mode. Time compression by a factor of 72 has been achieved with a 1 μs input pulse frequency-modulated by 125 Mc/s.
TL;DR: In this paper, a transistorized lightning-flash counter has been devised to operate with a lowvoltage battery and with a preset sensitivity, with frequency response and range similar to those of the widely used Pierce-type counter, with a 5V/m threshold.
Abstract: A transistorised lightning-flash counter has been devised to operate with a low-voltage battery and with a preset sensitivity. The frequency response and range are similar to those of the widely used Pierce-type counter, with a 5V/m threshold.
TL;DR: The hyperbolic RC transmission line, defined by r = r0 sech2x and c = c0 cosh2x, is a new class of RC non-uniform line whose rc product is a constant.
Abstract: The hyperbolic RC transmission line, defined by r = r0 sech2x and c = c0 cosh2x, is a new class of RC nonuniform line whose rc product is a constant. This line can be used to make quantitative comparisons of the performance of the three general shapes of nonuniform RC lines with a constant rc product.
TL;DR: In this article, a thin film of transparent dielectric supporting the surface E0 wave mode is proposed, with properly chosen dimensions, attenuation of a few decibels per kilometre is theoretically achievable.
Abstract: A new type of optical waveguide is proposed. It consists of a thin film of transparent dielectric supporting the surface E0 wave mode. With properly chosen dimensions, attenuation of a few decibels per kilometre is theoretically achievable. A design is suggested which gives the guide the required flexibility for negotiating bends.
TL;DR: A simple transistor circuit suitable for adaptive-logic experiments and its application to an adaptable two-bit code translator is described.
Abstract: A simple transistor circuit suitable for adaptive-logic experiments is described. Its operation depends on the fusing of links in signal pathways, which are selected by subjecting the device to the correct logical operation. Its application to an adaptable two-bit code translator is described.
TL;DR: In this article, a general proof using a quantum argument is presented of the Manley-Rowe relations, which provide information on power transfers between different frequencies arising in the circuits of parametric amplifiers and related devices.
Abstract: A general proof using a quantum argument is presented of the Manley-Rowe relations, which provide information on power transfers between different frequencies arising in the circuits of parametric amplifiers and related devices.
TL;DR: In this paper, Doppler shifts of plamsa waves in a low-pressure mercury-vapour discharge have been made, in order to determine the electron drift velocity in the positive column.
Abstract: Measurements of Doppler shifts of plamsa waves in a low-pressure mercury-vapour discharge have been made, in order to determine the electron drift velocity in the positive column. It is concluded that, within the accuracy of the expenments, there is no radial variaton of the electron drift velocity in the discharge.
TL;DR: Delayed versions of linear binary sequences can be generated by linear logic, and the required logic may be determined by circuits which perform polynomial division.
Abstract: Delayed versions of linear binary sequences can be generated by linear logic. The required logic may be determined by circuits which perform polynomial division, and this makes possible the sequential generation of all delayed versions.
TL;DR: In this article, a method for adjusting large multielement, aerial arrays is described, where a ring transmission line is used to calibrate the array elements in each direction in turn.
Abstract: A method for adjusting large multielement, aerial arrays is described. Calibrating signals are transmitted to the array elements in each direction in turn along a ring transmission line. With this procedure, gain and phase shift can be compared between elements without determining the length or attenuation of the calibration-signal feeder.
TL;DR: In this paper, the scattering of intermodulation frequency sound waves arising from the nonlinear interaction of two collimated and coincident plane waves of sound of different frequencies was studied.
Abstract: Westervelt and Bellin and Beyer have studied the scattering of intermodulation frequency sound waves arising from the nonlinear interaction of two collimated and coincident plane waves of sound of different frequencies. This work is extended to account for the finite aperture formed by the cross-section of the column; experimental results are compared with those obtained theoretically and with Bellin and Beyer's results.
TL;DR: In this article, the authors describe experiments with epitaxial GaAs layers 13 μm thick, with applied voltages less than 9V, and have generated fundamental frequencies near 12 Gc/s, with additional frequencies near 15, 19 and 23 GHz.
Abstract: It has been shown previously that fields of 3000 V/cm applied to GaAs sam generate microwave oscillations. This letter describes experiments with epitaxial GaAs layers 13 μm thick. These have been operated c.w., with applied voltages less than 9V, and have generated fundamental frequencies near 12 Gc/s, with additional frequencies near 15, 19 and 23 Gc/s.
TL;DR: In this paper, a mathematical model which defines a new subclass of voltage-inversion negative-impedance convertors is presented, and three realisations of convertors in the new subclass are given, together with two new realizations of Larky's model.
Abstract: A mathematical model which defines a new subclass of voltage-inversion negative-impedance convertors is presented. Functionally, the model is a dual of that from which Larky realised his well known current-inversion n.i.c. Three realisations of convertors in the new subclass are given, together with two new realisations of Larky's model. Each convertor in the new subclass exhibits an improvement in gain-product sensitivity by a factor of two compared with its Larky-type dual.
TL;DR: In this paper, a method for designing a combline filter which may be tuned over a frequency range without appreciable change in bandwidth is described. But this method is not suitable for a large number of channels.
Abstract: A method is described of designing a combline filter which may be tuned over a frequency range without appreciable change in bandwidth.
TL;DR: In this article, it has been found that the electric strength of polythene increases by more than 50% under the effect of hydrostatic pressure and constraint and that the strength appears to decrease with increase of thickness and with time of voltage application above a certain stress.
Abstract: It has been found that the electric strength of polythene increases by more than 50% under the effect of hydrostatic pressure and constraint. The electric strength appears to decrease with increase of thickness and with time of voltage application above a certain stress.
TL;DR: In this article, a lumped-parameter nonlinear transmission line is analyzed rigorously for traveling-wave harmonic generators, parametric amplifiers and nonlinear time-variable delay lines.
Abstract: A lumped-parameter nonlinear transmission line is analysed rigorously. The method of analysis is applicable to travelling-wave harmonic generators, parametric amplifiers and nonlinear time-variable delay lines.