ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (109,862)
  • 2010-2014  (97,169)
  • 1965-1969  (9,656)
  • 1950-1954  (3,037)
  • Electrical Engineering, Measurement and Control Technology  (109,862)
Collection
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 21-23 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A 10-stage digital light beam deflector is described using Kerr cell polarisation switches and calcite birefringent prisms. Optimum design criteria are derived with respect to resolution and drive voltage. The final device had an overall transmission of 91% and could be switched from one direction to another in 0.2μsec.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 9-12 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The low-frequency unclamped electro-optic coefficients of proustite have been measured at an optical wavelength of 0.6328μm. The results show thatr 22 is comparable to that of lithium niobate,r 13 andr 33 are considerably lower. The maximum theoretical value is calculated at 10.8×10−12 m/V about three times the largest measured coefficient value.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 69-74 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A simple dye-laser system is described in which Rhodamine dyes are pumped by a co-axial linear air flashlamp in a cylindrical elliptical pumping reflector. Output pulses lasting up to 1.5μsec and containing up to 250 mJ energy, have been successfully mode-locked to produce 100% modulated pulse trains. Employing a diffraction grating as cavity reflector to tune the laser frequency, in each case, for maximum absorption by the same Q-switching dye, successful mode-locking has been achieved with both Rhodamine B and Rhodamine 6G. Time resolved emission spectra have been recorded with an image tube streak camera and the effect of resonant reflectors has been studied.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 128-133 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A theory of spatial frequency domain filters is presented from the standpoint of leastsquare linear estimation. The general expression of this filter is obtained with few assumptions, thus allowing considerable flexibility in its application. Noise common to pictorial information usually can be described as a mutually exclusive process, whereas much of the available signal processing theory assumes additive noise. Types of pictorial noise discussed in this paper include the background of signal patterns, pattern obscurity, and image modulation due to the recording process. It is shown that the additive noise assumption is valid under certain conditions. The general filter is described in terms of spatial frequency estimates which are conveniently expanded for particular applications. A detection filter for determinative patterns is obtained and compared to the matched filter. A filter is derived to restore patterns degraded by noise and a linear distortion filter.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 134-137 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A method is described for producing two controllable pulses from a Q-switched solid state laser, the time separation of the pulses being variable from about 30 nsec to a few microseconds. The technique involves Q-switching the system with a time variant loss which has two steps, the application of the first step only partially depleting the population inversion. The method has been demonstrated with an electro-optically Q-switched Nd:CaWO4 laser.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 152-154 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 155-159 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 151-152 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. i 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 25-28 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An equation of quadratic form is derived relating the phase mismatchΔk=¦k sum −k pump −k slgnl ¦ in an optical sum-frequency generation process to the angle ψ between the pump and signal wave vectors. For a special value ofk pump a solution ofΔk=0 exists having degenerate roots and consequently a single value of ψ. Because of this it is possible to choose a non-collinear phasematching situation for an optical up-converter which tolerates a much larger signal beam divergence than if a collinear-beam interaction were chosen. The case of up-conversion of 10.6μm radiation to the visible, using ruby-laser pumped proustite was chosen as an example for experimental study. Under tangential phase-matching conditions an angular acceptance angle of the infra-red beam of 300 mrad was achieved for a crystal 0.45 cm long.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 13-19 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The role of the solvent in the passive Q-switching of lasers by solutions of organic dyes has been examined in detail. It was found that several pure organic solvents could themselves partially Q-switch the laser, in the absence of the dye. This behaviour was observed for both ruby and neodymium: glass lasers. Pulse-widths as short as 20 nsec were occasionally recorded. Peak powers up to 2 MW have been observed using 1-chloronaphthalene to switch a ruby laser. It is proposed that Q-switching arises from an enhancement of reflectivity of the liquid, during the evolution of the laser pulse, through the formation of a periodic refractive index modulation in the liquid by the action of standing waves.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 33-35 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper describes a method for determining some important laser parameters from the fluorescence changes of an excited media induced by a resonant laser pulse. The parameters measured include stimulated emission cross-section, metastable level population and spectral relaxation rate. Results are reported for Nd3+ in silicate and phosphite glasses and in solution in POCl3 and SeOCl2.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 49-59 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We first describe the basic linear and non-linear mathematical operations underlying most image enhancement techniques, and compare the hardware available for carrying out these operations which includes digital computers, optical set-ups and special electro-optical devices. Then we give a brief account of the commonly used image enhancement techniques, such as contrast enhancement, crispening, noise elimination, and inverse filtering. Finally, we mention some examples of image enhancement in the biomedical area.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 45-48 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract By means of a simple grating and lens arrangement, the detour phase effect makes it possible to add and subtract any number of one-dimensional functions. This process may also be used for certain logic applications.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 37-44 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Huygens' principle is derived for short wavelengths in inhomogeneous, isotropic media from considerations of Green's second theorem and the solution to the time-independent wave-equation for a point-source in an inhomogeneous, isotropic medium. This principle leads to an integral equation for the field distribution on optical resonator mirrors, whose parameters depend only upon the geometrical-optics ABCD-matrices. The resonator parametersF, G 1,G 2, the resonance and stability conditions as well as the spot size of the fundamental mode at the mirrors are given as functions of A, B, C, D, for the special case of a rotationally symmetric optical system between square mirrors. The resonator parameters,F, G 1,G 2, are calculated by this new method for a case familiar from the literature.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 119-120 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 121-121 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 165-171 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract It is shown how the theory of non-linear interaction between the modes of the open resonator, developed previously [1] and used to study resonant second harmonic generation [2], can be applied to second harmonic generation in the absence of a resonator. The conditions under which the second harmonic output, in the small conversion approximation, can be approximated by a Gaussian beam are derived. The optimum value of the focusing parameter I/z0 (hereI is the length of the crystal, andz 0 is one-half the confocal parameter of the fundamental beam) for the total output is shown to be 5.68 agreeing precisely with the value given by Boyd and Kleinman [3].
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 189-192 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Experiments are reported on 1.06μm scattering from a laser produced plasma. Generally in such experiments scattering is observed on the shock wave front at 90° from the incident beam. In our set-up the plasma is expanding in a Fabry-Perot resonator and we note a strong emission at 1.06μm.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 174-178 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The absorption of light and subsequent thermalisation of the absorbed energy can be significantly affected by the presence of non-equilibrium population distributions in gases. The phenomenon of thermal blooming in gases is discussed from this standpoint. It is shown that a transient phenomenon of “absorption cooling” can occur, leading to a focusing rather than defocusing of an incident laser beam. Flux densities causing saturation in air and pure CO2 are calculated. For vibrational saturation in air, I 〉 3.66 kw/cm2, for pure CO2, I 〉 4.58 kw/cm2. For rotational saturation, in either gas, I 〉 840 kw/cm2.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 21
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 196-204 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract It is known [1–3] that the statistical properties of the electrons emitted by a detector, which registers a light beam, contain information about light radiation statistics. This method has recently been widely used to measure the statistical properties of laser radiation [4]. In analysing non-linearly-transformed laser or thermal radiation, this method can give information about the non-linear process and also additional data on the statistics of the transformed radiation.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 22
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 219-219 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 23
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 213-217 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have determined the two independent “fast” non-linear refractive indices for liquid mixtures of CS2 and CCI4 to within 5% relatively and 8% absolutely over their range of more than a decade. These indices describe non-linear propagation of optical pulses of arbitrary polarisation, which are of a too short duration to be affected by electrostriction. We report measurements, having relative accuracy better than 1 %, of the static Kerr constants of these mixtures. We combine these results with recent data on Rayleigh wing depolarisation ratios for the same mixtures to deduce the desired non-linear indices with the aid of molecular theory. The non-linear refractive index for linearly polarised light is shown to be two-thirds (±5%) of the index difference measured by the Kerr effect, at least for molar concentrations of CS2 greater than 10%. Our measured relative values of the mixture Kerr constants are predicted to within experimental error if one simply replaces the Lorentz local field factors in the classical theory by their 0.6 powers.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 24
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 1-8 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The optical and electrical problems in the design of a beam-sampling detector for laser power, energy and pulse duration measurements are discussed with a view to achieving an accuracy of 2% relative to a fundamental detector for pulses down to 3 nsec duration. Experiments show that a beam sampler using an ITT F4000 biplanar vacuum cell mounted in a coaxial taper is capable of this accuracy, but that the silicon diodes (EG + G SD100, Mullard BPY13A) trap some of the photoelectric charge and then release it with a time constant of up to a few microseconds giving a pulse length-dependent sensitivity: they can be used for energy measurements, however. The Mullard 90CV vacuum photo-cell holds back about 6% of the photo-electric charge for about 1μsec and can also give erratic currents up to ten times the computed saturation current: effects probably due to residual gas in the cell. The limits set on performance by the rise time and maximum linear current of the various detectors are discussed. The design of a holder for the ITT F4000 photo-cell giving a rise time constant of 0.25 nsec is given.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 25
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 29-31 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract There is at present great interest in crystals which are suitable for efficient mixing at optical frequencies. Such a crystal should be acentric, have a wide transmission band, have a large non-linear coefficient and permit phase matching. Proustite possesses such properties [1], and this paper summarises the information that has been obtained to date at R R E on these properties and their use in “up-converting” 10μm radiation to the visible, on the available optical quality, on the electro-optic effect, and on electrical conduction in the crystal; some general observations on the type of damage caused to proustite by laser beams are given.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 26
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 62-64 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 27
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 64-66 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 28
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 67-67 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 29
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 75-87 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A general equation is proposed for the dynamical electric permittivity tensor, taking into account, besides frequency dispersion, spatial dispersion describing the linear and non-linear optical activities of the medium. It permits one to determine the symmetry relations and value of the optical Kerr effect, a generalised Havelock relation, and the non-linear change in optical rotation angle for arbitrary conditions of observation. Simple examples are adduced to give a microscopic interpretation of the results derived, rendering apparent the basic mechanisms (fluctuations of density, non-linear changes in the optical polarisability tensor and gyration tensor, molecular reorientation, and various radial and angular correlations) leading to induced optical non-linearities. Measurements of non-linear changes in optical rotation angle are shown to be promising in solutions of polymers or colloids, and will permit,inter alia, direct determinations of the anisotropy of gyration properties of molecules macromolecules and colloid particles.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 30
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 103-118 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The propagation of light near the axis of astigmatic optical systems may be described by the geometrical-optics approximation with the aid of ray-matrices. The application of the theory of diffraction to the propagation of light in such systems leads to integrals containing essentially the elements of the ray-matrices as parameters. The ABCD-law is derived by evaluating these integrals for gaussian beams. Integral equations applicable to astigmatic optical resonators, having nearly vanishing diffraction losses, are set up. They are only valid under certain conditions, which are comprehensively discussed. The eigensolutions and the eigenvalues of these integral equations are given. The spot-sizes at the resonator mirrors are derived from the eigensolutions, and the eigenvalues lead to the resonance condition. Spot-sizes and resonance condition appear as functions of the elements of the characteristic resonator matrices. The methods described here are applied to the propagation of gaussian beams through gas-lenses and to a resonator containing an internal gas-lens.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 31
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 89-101 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An analysis of the propagation process in fog has been performed by means of the Monte Carlo method. The effect of multiple scattering on image quality and on visibility range has been studied, together with the detailed time dependence of the light at the receiving system. The improvement in visibility achievable with range gating techniques has been evaluated.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 32
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 120-120 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 33
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. ii 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 34
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 123-127 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Pulse stretching of a passively Q-switched ruby laser is accomplished by the introduction of a non-linear absorber into the laser cavity. Single pulses of length 150 to 400 nsec are observed. The non-linear absorption is obtained by using a Rayleigh-wing scatterer as the solvent for a bleachable dye. This approach is unique in that stretched Q-switched pulses may be obtained by the introduction of a single liquid into the laser resonator with no electronics necessary. Since the Rayleigh Frequency is within the gain lineshape of the active medium, threshold for the stimulated Rayleigh scattering is exceeded at relatively low power densities.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 35
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 121-121 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 36
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 138-142 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract It is shown that the image upconverter can operate with point source pump-beams as well as the commonly used planar pump source. The major effect of the pump beam divergence is not to degrade the resolution but is to change the transverse and longitudinal magnification of the image. We demonstrate by a paraxial ray-tracing analysis that these changes in image dimensions and location obey relations quite similar to thin-lens formulae.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 37
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 143-150 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The development of techniques for the deposition of semiconductor layers has led, over the last decade, to intensive studies of heterojunction systems. In this paper an outline is given of those properties relevant to the production of photodetectors, illustrated by a summary of the classes of device so far prepared with notes on the way in which their performances differ from classical detectors.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 38
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 159-159 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 39
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. II 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 40
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 61-62 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 41
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 160-160 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 42
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 172-173 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Polaritons associated with the 1072 cm−1 optical mode of quartz have been stimulated by a two-beam method and we have directly observed the far-infrared radiation corresponding to the electromagnetic part of the excitation with a HgTe-CdTe detector.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 43
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 161-164 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Wavelength and frequency data for far-infrared c.w. gas laser lines have been scanned using a computer for chains of harmonic coincidences suitable for transferring frequency measurements from the submillimetre to the 10μm wavelength region. A table of selected possibilities using up to three lasers in sequence is presented showing the calculated beat frequencies.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 44
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 179-181 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Temperature tunable, 90° phase matchable, parametric fluorescence has been observed in ADP and KDP crystals. The fluorescence was pumped by 2573 Å CW radiation obtained from a second harmonic argon-ion laser. Fluorescence was observed in ADP over the complete visible spectrum by temperature tuning through the range —12 to+40° C. The measurements demonstrate the usefulness of these materials for visible parametric oscillators. The values of d(n 2v e −n v o )/dT deduced from these and other measurements are found to disagree with values in the literature.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 45
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 182-188 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The insertion of a multi-photon absorber within a laser cavity has practical importance in providing stabilised laser amplitude and variable pulse duration. We report the relative non-linear absorption coefficients of semiconductors Si, CdSe, CdTe, and GaAs at 1.064μm using a Q-switched Nd:YAG laser. The measurements on Si were carried out from 77 to 450° K, and the results confirm a stepwise process giving rise to induced absorption. The effects of the spatial and temporal distributions of the laser emission on the absolute non-linear coefficient values are briefly discussed. Preliminary observation of stepwise multi-photon absorption in aqueous PrCl3 and NdCl3 measured with a pulsed Nd:glass laser is also reported. The possibility of using a combination of inducible and saturable absorbers, placed within the laser cavity, as a means of providing laser intensities confined to a narrow range centred about a pre-set intensity, is raised.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 46
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 193-195 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In this experiment, the transmission of the saturable absorber of a mode-locked laser is modulated optically by a train of ultra-short pulses emitted by another laser, with some power reflected inside the cavity to initiate the emission. The laser threshold is only attained during the opening time of the modulator, and stimulated emission is prevented at any other time. Once pulses are formed, the photon density is sufficiently high for auto-modulating the dye. Q-switching of the laser is only realised if the difference between the time of a round-trip in the cavity and the period of modulation is less than ±17 psec. The emission is a series of pulses of 5.2 nsec period lasting for 60 nsec. The total energy in all pulses is 60 mJ for a neodymium doped glass rod of 8 mm diameter. We describe a method for measuring the noise of the series of pulses using a saturated photo-cell. We find a ratio of 100 between the energy of one pulse and the energy emitted between two pulses.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 47
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 218-218 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 48
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 1 (1969), S. 209-212 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper is concerned with the investigation of a longitudinal electric field (1 V/cm) arising in a homogeneous piezo-electric crystal at a high level of optical excitation. The sign of the effect corresponds to free carrier drag (electrons — in the case of CdS) in the direction of light propagation. The magnitude of the effect and its kinetics have been related to the light intensity, temperature, crystal orientation and the distance between the fest points. The effect is assumed to be a result of generation of a phonon packet, referred to by the authors as an acousto-optical domain, and carrier drag by this domain. Calculations based on the Boltzmann kinetic equation for the electron distribution function give a reasonable phonon density inside the domain, necessary for generating the electric field observed. Estimates based on the calculated phonon density show considerable mechanical stresses to exist in the domain area. These can result in the destruction of the crystal when there is an increase in light intensity; so the effect observed can be directly related to the problem of optical strength.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 49
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 39 (1950), S. 698-711 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Es wird das Regelproblem der Kollektormaschine allgemein untersucht, d.h. es werden die Schwingungsformen und-amplituden der Ausgleichsvorgänge bei Regulier- und Last- oder auch Spannungsstößen aller Art bestimmt. In sowohl einer praktischen Näherungslösung als auch einer vollgültigen exakten Lösung werden speziell die Stabilitätsgrenzen aufgezeigt. In einem praktischen Beispiel wird der Einfluß von Last- und Spannungsstößen auf Strom und Drehzahl der Maschine errechnet und die Größe der zulässigen Ankerrückwirkung auf das Feld bestimmt.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 50
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 39 (1950), S. 711-717 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht 1. ε0 und μ0 als Schlüsselzahlen der absoluten Maßsysteme. 2. Der Faktor 4π. 3.Wallots Darstellung. 4. ε0 und μ0 als physikalische Größen. 5. Größengleichungen. 6. Die CGS-Einheiten.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 51
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 39 (1950), S. 668-697 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Die Bestimmung der Betriebsgrößen (Spannungen an den Verbraucherklemmen, Spannungsabfälle, Wicklungsströme usw.) einesn-Wicklungstransformators unter Zugrundelegung der üblichen Ersatzstromkreise alsn-seitiger Vielecke erfordert nicht nur einen sehr umständlichen und zeitraubenden Rechnungsgang zur Festlegung der Scheinwiderstände der Zweige des Ersatzkreises, sondern die Rechnungsergebnisse sind auch recht unsicher. Diese Unsicherheit rührt hauptsächlich davon her, daß die Scheinwiderstände als Funktionen der Koeffizienten der eigenen und gegenseitigen Induktion der Wicklungen ausgedrückt werden, welche bekanntlich, ohne vereinfachende Annahmen über den Feldverlauf, durch die Rechnung nicht erfaßt werden können. Die üblichen Annahmen, die man dabei trifft, geben aber die physikalischen Zusammenhänge nicht einwandfrei wieder und führen schon beim Zweiwicklungstransformator zu Ergebnissen, z. B. zum Begriff negativer Streuung von Wicklungen, die von praktischen Messungen an ausgeführten Transformatoren widerlegt werden. Ausgehend von der nunmehr allgemein angenommenen Trennung des gesamten mit einer jeden Wicklung verketteten Feldes in ein Haupt- und ein Streufeld wird hier ein Verfahren abgeleitet, das zur Bestimmung der Streukoeffizienten der Wicklungen die vorherige Ermittlung der Koeffizienten der eigenen und der gegenseitigen Induktion der Wicklungen umgeht und das Aufstellen eines besonderen Ersatzstromkreises bein-Wicklungstransformatoren überflüssig macht.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 52
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 39 (1950), S. 571-578 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Zusammenfassung Die Wirkung des Reaktionsmotors entsteht durch Ungleichheit der Reaktanzen in der Längs- und Querachse. Je größer das Verhältnis dieser Reaktanzen wird, um so besser werden die Eigenschaften des Motors: Überlastbarkeit und Leistungsfaktor. Bei praktischer Ausführung des Motors ist die Berücksichtigung der Eisensättigung unentbehrlich. Um die Schwierigkeiten bei der Berechnung welche durch die Eisensättigung entstehen, zu beseitigen, kann man ein hier erläutertes angenähertes Verfahren verwenden.
    Notes: Übersicht Es werden behandelt die wichtigsten Eigenschaften des Reaktionsmotors erst ohne Berücksichtigung und danach mit Berücksichtigung der Eisensättigung.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 53
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 39 (1950), S. 578-600 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Zusammenfassung Für den geschlossenen magnetischen Kreis werden die absoluten und die relativen Unterschiede zwischen beidenH c -Definitionen I H c und B H c formelmäßig dargestellt und ihre Abhängigkeit von der Steilheit der Entmagnetisierungskurve zwischen beiden Koerzitivkräften an Hand praktischer Beispiele diskutiert. Die magnetischen Zustände des Ferromagnetikums bei derJ und derB der Koerzitivkraft werden für homogen und für inhomogen magnetisierbare Probenformen erläutert und durch Messungen belegt. Bei homogener Magnetisierung ist der I H c -Wert vom Entmagnetisierungsfaktor und vom Meßort völlig unabhäng g; er charakterisiert als Materialkonstante am besten den physikalischen Zustand des Magneten, bildet aber keine technische Kennziffer. Bei inhomogener Magnetisierung zeigen stabförmige Magnete geringeH c -Unterschiede bei der Messung im offenen Kreis ( I H′ c -Wert) gegenüber der Messung im geschlossenen Kreis ( I H c -Wert); außerdem ist eine geringe Abhängigkeit des I H′ c -Wertes vom Meßort auf der Probe vorhanden, da der I H′ c -Wert nach den Stabenden zu etwas abnimmt. Der B H c -Wert ist dagegen auch schon bei homogener Magnetisierung stark vom Entmagnetisierungsfaktor abhäng g ( B H′ c -Wert), bei inhomogener Magnetisierung ist außerdem eine große Abhängigkeit vom Meßort vorhanden, da der B H c -Wert nach den Stabenden stark abnimmt. Daher ist nur der B H c -Wert des geschlossenen Kreises eine Materialkonstante, er bildet vor allem für die Beurteilung von Dauermagnetwerkstoffen eine wichtige technische Kennziffer. Eine vonDowdell angewandte Definition der Koerzitivkraft als der Feldstärke für das Verschwinden der Induktion nach Aufhören des entmagnetisierenden Feldes (H c -Wert) ist wegen ihrer starken Abhängigkeit vom Entmagnetisierungsfaktor und von der reversiblen Permeabilität nicht zu empfehlen (H′ c -Wert). Bei gegebener Entmagnetisierungskurve (in derJ oder derB) und bekanntem Entmagnetisierungsfaktor lassen sich die Werte I H c , B H c , und B H c graphisch durch ein Scherungsparallelogramm ermitteln, bei außerdem gegebener innerer Magnetisierungskurve die WerteH c undH′ c .
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 54
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 39 (1950), S. 619-632 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Zusammenfassung Es werden unter Berücksichtigung der Dämpfungen Gleichungen für die Koppelelemente zwischen einem Röhrengenerator und dem mit Hochfrequenz zu erwärmenden Arbeitsgut hergeleitet. Aus ihnen läßt sich eine systematische Übersicht über die Auskopplungsmöglichkeiten gewinnen. Ferner finden sich die Wirkungsgrade angegeben, mit deren Hilfe eine Beurteilung dieser Möglichkeiten unter dem Gesichtspunkt geringster Verluste im Einzelfall möglich ist. Die transformatorische Ankopplung induktiver Verbraucher wird ausführlich behandelt. Es werden die Dimensionierungsunterlagen für den Transformator bei gegebenem Verbraucher für den praktischen Gebrauch graphisch dargestellt und umgekehrt bei gegebenem Transformator der zur Anpassung führende Verbraucher berechnet. Schließlich werden Gleichungen angegeben, welche es gestatten, je zwei Schaltelemente bei variierendem Verbraucher zur Erzielung der Anpassung zu dimensionieren.
    Notes: Übersicht Es soll im folgenden eine systematische Übersicht über die Auskopplungsmöglichkeiten von Röhrengeneratoren gegeben werden, wie sie heute in rasch steigendem Maße für industrielle Erwärmungszwecke, sei es auf kapazitive oder induktive Weise, Verwendung finden. Unter Auskopplung werden hier die Schaltmaßnahmen begriffen, die zur Anpassung des Generators an einen vorgeschriebenen Verbraucher getroffen werden. Es wird dabei vorausgesetzt, daß der Parallelschwingkreis des einstufigen, selbsterregten Generators zwischen Anode und Kathode einer Triode liegt. Der Übergang von der Kathoden- zur Anoden- oder Gitterbasisschaltung ist sinngemäß ohne weiteres vollziehbar und wird hier nicht behandelt. Ferner werden die verschiedenen Rückkopplungsmöglichkeiten außer acht gelassen und die Mehrwelligkeiten der betrachteten Schaltungen nicht berücksichtigt. Es ist klar, daß der Fortfall dieser Annahmen zu einer Auslese der im folgenden diskutierten Auskopplungsmöglichkeiten führen muß. Aber auf jeden Fall wird sich mit ihnen eine Übersicht und formelmäßige Erfassung der überhaupt in Frage kommenden und der schon gebräuchlichen Auskopplungen ergeben. Die Betrachtungen gelten für einen Frequenzbereich, in dem Wirk- und Blindwiderstände wenigstens mit praktisch ausreichender Annäherung in den Schaltungspositionen konzentriert sind.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 55
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 1-2 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 56
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 3-3 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 57
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 16-30 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 58
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 4-16 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Es wird berichtet über die Untersuchung verschiedener γ-Eisenoxyde und Ferrite bei Wechselfeldbeanspruchung. Die Frequenzgänge der elektrischen und magnetischen Stoffwerte (elektrische Leitfähigkeit, Dielektrizitäts- und Permeabilitätszahl sowie elektrische und magnetische Verlustzahl) werden angegeben und die hieraus sich ergebenden Folgerungen bezüglich der Ursachen der gefundenen Frequenzabhängigkeit erörtert. Auf die verschiedenartige Verwendung der Bezeichnung “komplexe Permeabilität” wird kurz eingegangen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 59
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 30-36 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 60
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 45-48 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Die allgemeinen Funktionen der Speicherröhren werden beschrieben und aus den Erscheinungen der Sekundäremission hergeleitet. Die besondere Form der “Sieb-Speicherröhre” wird gezeigt und auf einige Einzelheiten hingewiesen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 61
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1950), S. 37-44 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Die Überschlagsspannung von stützerähnlichen Isolierkörpern, die bei homogenem Feld und trockenem Gas die Durchschlagsspannung der isolatorfreien Funkenstrecke erreicht, wird mit zunehmender relativer Feuchtigkeit des Gases erheblich abgesenkt, wenn sich auf der Oberfläche eine Wasserhaut bzw. Tröpfchenschicht zu bilden vermag. Man hat den erzielbaren geringsten Überschlagswert im Gebiet der Sättigung mit Minimalspannung bezeichnet. In vorliegender Arbeit wird über die Bestimmung der Überschlagsspannung in mit Wasserdampf gesättigter Druckluft bis 24 at abs., berichtet. Auch im Gebiet hoher Drücke wird man eine Minimalspannung finden. Als Isolierkörper dienen vornehmlich zylindrische Glasproben von 0,6 bis 3 cm Länge, eingesetzt zwischen die Elektroden einer Plattenfunkenstrecke. Überschlagsversuche im Gebiet geringeren Feuchtigkeitsgehaltes, sowie vergleichende Durchschlagsmessungen an einer Funkenstrecke, Spitze gegen Platte, geben einigen Aufschluß über den Entladungsvorgang beim Überschlag in Druckluft.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 62
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1951), S. 75-88 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 63
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1952), S. 363-366 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 64
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1952), S. 366-369 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Die Größen, die für die günstigste Bemessung von Magnetsystemen maßgebend sind, sind den, nach Art und Vorbehandlung der Magnetsysteme verschiedenen magnetischen Zustandskurven zu entnehmen. Dazu wird ein einfaches und anschauliches graphisches Verfahren angegeben, das auf vorliegende durch Messung gefundene Zustandskurven anwendbar ist.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 65
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 40 (1952), S. 391-397 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Anschließend an eine Untersuchung des Strom-und Drehmomentverhaltens wird die statische Kippgrenze einer Ausgleichwelle aus zwei Wellenmaschinen ungleicher Type ermittelt. An Hand der Ergebnisse lassen sich Voraussagen über die Belastbarkeit von Mehrmaschinenwellen machen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 66
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 41 (1953), S. 127-135 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Die prinzipielle Wirkungsweise der Querfeldverstärkermaschine wird betrachtet. Der Einfluß der Hystereseschleife des Eisens, der Bürstenübergangsspannung und der Kommutierungsvorgänge bleibt unberücksichtigt. Die mathematischen Zusammenhänge der idealisierten Anordnung werden aufgestellt und mit Hilfe derLaplace-Transformation behandelt. Die dynamischen Eigenschaften, die durch die zwei Stufen der Maschine und innere Kopplungen bedingt sind, werden erläutert und ihre Bedeutung bei Verwendung der Querfeldverstärkermaschine in Regelkreisen und Steuergruppen dargestellt.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 67
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 41 (1953), S. 136-142 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Es wird ein exaktes Summationsverfahren für dieOssannasche Reihe, aufbauend auf den Beiträgen einzelner Oberwellengruppen, angegeben, und an drei Beispielen, auch für Bruchlochwicklung, erläutert.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 68
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 41 (1954), S. 312-320 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Ein elektrischer Beschleunigungsmesser für Winkelbeschleunigungen wird beschrieben und sein Verhalten theoretisch und praktisch untersucht. Das Gerät liefert einen der Beschleunigung proportionalen Strom und kann für Ausgangsleitungen bis etwa 100 W gebaut werden.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 69
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 41 (1954), S. 333-346 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 70
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 41 (1954), S. 320-333 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Die Vierpoltheorie (Wellenparametertheorie) in der bisher bekannten Form befaßt sich mit einer (symmetrischen) Betriebsweise des (symmetrisch oder unsymmetrisch aufgebauten) Einzelvierpols, die die Zusammenschaltung zu homogenen Ketten mit innerer Widerstandsanpassung (an den Wellenwiderstand oder den Kettenwiderstand) ermöglicht. Die hier angestellten Untersuchungen betrachten den Vierpol ebenfalls nach den Grundsätzen der Wellenparametertheorie, jedoch bei unsymmetrischem transformierenden Betrieb, derart, daß zwischen den Impedanzen der beiden Seiten ein frequenzunabhängiges reelles Verhältnis mit der Bedeutung eines Transformationsverhältnisses besteht, so daß sich aus derartig betriebenen, einander ähnlichen, jedoch in den Impedanzwerten geometrisch abgestuften Einzelvierpolen inhomogene (transformierende) Ketten mit potenziertem Transformationsverhältnis aufbauen lassen. Die innere Widerstandsanpassung ist dabei ebenfalls möglich, doch muß zu diesem Zweck ein neuer charakteristischer Widerstand, der sog. transformierende Kettenwiderstand definiert werden. Derartigo Ketten sind vorzugsweise als frequenzunabhängige Transformationsanordnungen für die Hochfrequenztechnik geeignet. Die Untersuchungen beschränken sich dementsprechend auf den Durchlaßbereich.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 71
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 41 (1954), S. 347-356 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Es werden verschiedene Typen von festen, stufenweise veränderlichen und kontinuierlich veränderlichen Verlustwinkelnormalen (Kondensatoren mit zugeschaltetem Widerstand) beschrieben. Die beim Aufbau zu beachtenden konstruktiven Rücksichten und die bei der Benutzung anzuwendenden Rechenverfahren werden erörtert. Die Übereinstimmung der Berechnung mit dem experimentellen Befund wird nachgewiesen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 72
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 299-314 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 73
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 320-330 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary Computing methods for determining optimum conditions in thermal interconnected power system operation are constantly undergoing refinement and improvement. In the course of this process new methods have been developed which take into account practical inequality conditions for the representation of limitations. Additionally, steps have been taken to improve convergence. From the standpoint of experience for future programming of digital process computers, these methods are of considerable importance. The conditions equivalent to the Kuhn-Tucker-conditions were introduced intuitively [9] by the author in an carlier article. The engineer is given easily comprehensible reason for these.
    Notes: Übersicht Im Zuge der Verfeinerung und Verbesserung der Rechenmethoden zur Ermittlung des optimalen thermischen Verbundbetriebes sind neue Verfahren zur Berücksichtigung der in der Praxis auftretenden Ungleichungsbedingungen zur Darstellung von Begrenzungen, wie auch Maßnahmen zur Verbesserung der Konvergenz entwickelt worden. Sie sind im Hinblick auf Erfahrungen für eine spätere Programmierung digitaler Prozeßrechner von großer Bedeutung. Die den Kuhn-Tucker-Bedingungen äquivalenten Bedingungen sind seinerzeit [9] vom Verfasser intuitiv eingeführt worden. Für sie wird eine dem Ingenieur leicht verständliche Begründung gegeben.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 74
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 376-397 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary For coreless induction furnaces with conductive crucibles formulae are evaluatet for the electrical quantities, for the allotment of the power to the coil, crucible and pool and for the pressure in the pool. The calculations are examplified and compared with practice.
    Notes: Übersicht Für kernlose Induktionsöfen mit elektrisch leitendem Tiegel wird ein Berechnungsverfahren für die elektrischen Größen, für die Aufteilung der Ofenleistung auf Spule, Tiegel und Schmelzgut und für die Größe des Baddruckes abgeleitet. Das Verfahren wird anhand von Beispielen erläutert.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 75
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 8-18 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary It is shown how the original function of a component describing function can be expressed in the form of a series, thus eliminating the laborious determination of the roots of the denominator polynomial. Equations are derived for the evaluation of the extrema of the transfer functions. In an example the convergence of a series is examined.
    Notes: Übersicht Es wird gezeigt, wie die Originalfunktionen von gebrochen rationalen Bildfunktionen in Form von Reihenentwicklungen gefunden werden können, ohne daß die mühsame Bestimmung der Wurzeln des Nennerpolynoms erforderlich ist. Zur Abschätzung der Höchstwerte von Übergangsfunktionen werden Formeln abgeleitet. Anhand eines Beispiels wird das Konvergenzverhalten einer Reihenentwicklung untersucht.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 76
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 85-90 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary Modern “iron-clad” plates of lead-acid accumulators (type PzS) consist of tubular shaped elements of about 8 mm diameter. In the axis of these tubes, thin lead spines of 3 mm diameter serve as electron collectors. Nowadays, tubes (and plates) are longer as 500 mm and even tubes of greater length as planned. The current distribution along the length of the tube is calculated in the following publication. In particular it can be shown, that it is of no use to manufacture plates exceeding 1000 mm in length.
    Notes: Übersicht Die neuen Panzerplatten (PzS) sind aus rohrförmigen Elementen von etwa 8 mm Durchmesser aufgebaut, die als Elektronenanschluß eine achsiale Bleiseele von 3 mm Durchmesser haben. Die Länge der Röhrchen übersteigt bei den heutigen Konstruktionen bereits 500 mm, noch längere Platten sind geplant. In der nachstehenden Arbeit wird die Stromverteilung entlang der Achse dieser Röhrchen untersucht. Insbesondere zeigt sich, daß es nicht sinnvoll sein dürfte, über eine Plattenlänge von 1 m hinauszugehen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 77
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 101-104 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary This paper shows how a lattice network and its equivalent networks allow to form constant resistance separating networks in a simple manner. The networks that give the double frequency channels work independently from one another. The network known as Darlington-bridge also can be used as a constant resistance separating network.
    Notes: Übersicht Es wird gezeigt, daß sich aus einer Brücke und deren äquivalenten Schaltungen in einfacher Weise strenge Weichen bilden lassen. Die die Frequenzaufteilung erzeugenden Vierpole wirken voneinander unabhängig. Die als Darlington-Brücke bekannte Anordnung läßt sich ebenfalls als strenge Weiche anwenden.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 78
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 105-111 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary In view of the overwhelming importance of the magnetic non-linearity in the theory and application of electrical engineering, a more thorough-going treatment of inductances seems to be desirable. The paper deals at first with the definitions, the variation and the application of basic inductances at d. c. which are considered as an upper concept. These are the flux, the incremental and the energy inductances. Then the three usual possibilities for using the inductances for periodic current are discussed. The incremental inductance includes in the whole the relatively small variations of the variables current and flux. The inductances for harmonics are valid over the whole period, but only for a definitecouple of harmonics, without being associated with the flux as a whole. Which physical definition of inductance is valid for periodic current for the nonlinear part of the saturation characteristic, seems hitherto not to be investigated.
    Notes: Übersicht Angesichts der entscheidenden Bedeutung der magnetischen Nichtlinearität in der Theorie und Anwendung der Elektrotechnik scheint eine gründlichere Behandlung der Induktivitäten angebracht. Die Arbeit erläutert zuerst die Definitionen, die Änderung und die Anwendung der als Oberbegriff genommenen “Grundinduktivitäten” bei Gleichstrom. Diese sind die Fluß-, die Differential- und die Energieinduktivität. Dann kommen die drei herkömmlichen Möglichkeiten für die Verwendung der Induktivitäten bei periodischem Strom zur Sprache. Mit der Differentialinduktivität kann man die verhältnismäßig kleinen Änderungen der Variablen Strom und Fluß im ganzen erfassen. Die “Schwingungsinduktivitäten” sind über die ganze Periode, jedoch nur für eine bestimmte Harmonische gültig. Welche physikalische Definition der Induktivität bei periodischem Strom im nichtlinearen Teil der magnetischen Kennlinie gilt, scheint bisher nicht untersucht zu sein.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 79
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 128-132 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary The application of the Laplace Transformation for the system of equations describing a heatsource network gives in a simple way expression for the time-dependent temperatures of each source, the number of exponential functions being equal to the number of sources.
    Notes: Übersicht Die auf das Gleichungssystem des Netzes verwendeteLaplace-Transformation ergibt in einfacher Weise Ausdrücke für die zeitabhängigen Quellentemperaturen, wobei die Anzahl von Exponenten gleich der Quellenzahl ist.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 80
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 144-153 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary It has been investigated when the expression, which depicts the asymptotic response of the electron flow at the cathode of a Townsend-Discharge in a homogeneous field, is useful as a basis for an approximate calculation.
    Notes: Übersicht Es wird untersucht, wann der Ausdruck, der das asymptotische Verhalten des Elektronenstromes an der Kathode einer Townsend-Entladung im homogene Feld darstellt, als Grundlage für eine angenäherte Berechnung brauchbar ist.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 81
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 271-290 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary It is reported on details of a new effect discovered some time ago with positive and negative gliding discharges occurring at the same time on both sides of a plate insulator the surfaces of which are only partly covered by coaxial electrodes. The effect is characterized by the fact that the positive and negative discharges on different plate sides take themselves with one another. Therefore it is named as „Mitnahmeeffekt”. Measurements constituted that the spreading of both side discharges is very regular and obeys in principle equal laws as for one side gliding discharges.
    Notes: Übersicht Es wird über Einzelheiten eines vor einiger Zeit gefundenen neuen Effekts berichter, der auftritt, wenn gleichzeitig positive und negative Gleitentladungen auf den beiden, nur teilweise von koaxialen Elektroden bedeckten Seiten eines plattenförmigen Isolators zustande kommen. Der Effekt ist dadurch gekennzeichnet, daß sich die positiven und negativen Entladungen auf den verschiedenen Plattensciten gegenseitig mitnchmen. Er wird deshalb als Mitnahmeeffekt bezeichnet. Durch Messungen wurde festgestellt daß die Ausbreitung der beiderseitigen Entladungen sehr regelmäßig ist und im Prinzip gleichen Gesetzen wie für einseitige Gleitentladungen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 82
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 315-319 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Sumary A. Baelde, H. Groendijk andM. T. Vlaardingerbroek[1] have give the relation between the noise figure and stability of an amplifier with a negative conductance in its circuit From (II.4) follows that stability is proportional to bandwithB for large values of |Gt| (Gt= available power gain byFriis The noise figureF tot of the complete is after [1] a monotonously increasing function ofBandwidth B In figure 6,F tot is given as a function ofB of a 1150 Mc/s triodeamplifier preceded by a tunnel diode. It appears that the measurements agree with the theory after [1].
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 83
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 291-298 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary In this paper is reported on the distribution of an alternating current over the trapezoid crosssection of a metallic and sufficiently long conductor, who ist embedded in an infinitely permeable envelop up to a narrow air slit containing an alternating magnetic field, the feeler of the airgapfield between stator and rotor. The contour of the conductor with the trapezoid cross-section is composed here of two equally long opposite but divergent straight lines. The endpoints of which on the two ends are connected by two concentric circular arcs. The decisive partial differential equation for the field componentE z (ϱ, ϕ) in the direction of the conductor corresponds to the two dimensional wave equation in cylinder coordinates. As in the two other cases which are already counted over conformal with this method, namely in the cases of the rectangular and circular cross-section, the influence of the width of the slit is not exactly to realise. In cases which call for more excit calculations, it would be necessary to have knowledge of the Fourier-components of the magnetic induction in the slits of the grooves.
    Notes: Übersicht Es wird in dieser Arbeit die Stromverteilung in einem hinreichend langen, metallischen Stab von trapezförmigem Querschnitt berechnet, der von einem Wechselstrom durchflossen wird und bis auf einen schmalen, von einem magnetischen Wechselfeld erfüllten Luftschlitz von allen Seiten ohne merklichen Luftzwischenraum und isoliert in eine unendlich permeable, metallische Hülle eingebettet liegt. Der Umriß des Leiters mit dem trapezförmigen Querschnitt besteht aus zwei gegenüberliegenden, gleich langen, auseinander-strebenden Geradenstücken, deren Endpunkt oben und unten durch konzentrische Kreisbogen verbunden sind. Die maßgebende partielle Differentialgleichung für die FeldkomponenteE z (ϱ, ϕ) in Richtungz der Längsstreckung eines solchen Nutenleiters entspricht dann der ebenen Wellengleichugn in Zylinderkoordinaten. Nicht streng erfaßbar ist bei Anwendung dieser Methode geradeso wie in den beiden anderen bereits durchgerechneten Fällen, wo es sich um einen rechteckigen oder kreisförmigen Nutenquerschnitt handelt, der Einfluß der Öffnungsweite des Nutenschlitzes in der Oberfläche des Nutenleiters. Ist er hinreichend schmal, so kann die Verteilung der maßgebenden magnetischen Feldkomponente als gleichmäßig angesehen werden. Bei genaueren Rechnungen müßte man über die Fourierkomponenten des Feldes der magnetischen Induktion im Nutenschlitz Bescheid wissen. Diese Annahme wird in der Arbeit gemacht.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 84
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1965), S. 331-342 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary In order to investigate the transient behaviour of induction machines use is made of differential equations following the cross-field theory which are preferably solved by means of an analogue computer. In many cases it is sufficient to proceed from the simple slip-ring motor representation. With squirrel-cage motors, howerver, the skin effect in the rotor bars may no longer be neglected. In these cases the double-cage approximation is used which is moderate in complexity and reasonable in accuracy.
    Notes: Übersicht Für die Berechnung dynamischer Vorgänge bei Asynchronmaschinen werden nach der Zweiachsentheorie aufgestellte Differentialgleichungen verwendet, die im Einzelfall vorteilhaft mit Hilfe des Analogrechners auszuwerten sind. In vielen Fällen reicht es aus, das einfache, für Schleifringläufermaschinen übliche Ersatzbild zugrundezulegen. Bei den meisten Käfigläufermotoren ist jedoch die Stromverdrängung im Läufer nicht mehr vernachlässigbar. In diesen Fällen wird das Ersatzschaltbild der Doppelkäfigläufermaschine verwendet, das geringen Aufwand mit ausreichender Genauigkeit verbindet.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 85
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1965), S. 190-200 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary The article describes a method of calculating the resistance between two diagonal corners of a square network as a function of the number of meshes. The author defines a potential function, which holds good not only in the knots of the network, but also in the whole plane in which the network lies. This function can be calculated out of the impressed current and the boundary conditions with the help of the two-dimensional Laplace transformation. The boundary conditions of this function are ascertained. They allow the determination of the resistance in question and leads to an exact formula. A numerical estimation of the exact formula concludes the problem.
    Notes: Übersicht Der Aufsatz beschreibt ein Verfahren, nach dem sich der Widerstand zwischen zwei einander gegenüberliegenden Ecken eines quadratischen Gitters abhängig von der Maschenzahl berechnen läßt. Zunächst wird eine Potentialfunktion definiert, die nicht nur in den Knotenpunkten des Gitters erklärt ist, sondern in der ganzen Ebene, in der das Gitter liegt. Diese Funktion läßt sich mit der zweidimensionalen Laplace-Transformation aus den Einströmungen und den Randwerten berechnen. Die Randwerte dieser Funktion werden ermittelt. Sie gestatten, den gesuchten Widerstand zu bestimmen, so daß eine exakte Formel angegeben werden kann. Eine Abschätzung der gefundenen Formel rundet die Untersuchung ab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 86
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 201-206 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary The paper discusses a line whose end is terminated by a capacitor. Let us assume that it is charged to a certain DC voltage. When its input is suddenly short-circuited, transient waves will occur. The variation of the voltage and current across the capacitor is calculated for the two border-line cases in which the attenuation of the line is either small or very high.
    Notes: Übersicht Es wird eine Leitung betrachtet, die am Ende mit einem Kondensator abgeschlossen ist; sic sei auf eine bestimmte Gleichspannung aufgeladen. Wird sie am Anfang plötzlich kurzgeschlossen, so entstehen Wanderwellen. Der Spannungs-und Strom-Verlauf am Kondensator wird für die beiden Grenzfälle berechnet, daß die Leitung sehr kleine und sehr große Dämpfung hat.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 87
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 228-237 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary By values of ship greater than one, moment are developed in induction motors, which may reach values many times that of the rated one. These are due to the eddy currents which are caused in the rotor as a result of improper insulation between laminations. The effects of thuch currents are discussed in the following paper.
    Notes: Übersicht Das Drehmoment von Induktionsmaschinen erreicht im Bremsbereich Werte, die ein Vielfaches des Nennmoments betragen. Diese Momente werden vor allem durch Wirbelströme verursacht, die sich infolge der Überbrückung der Blechisolierung im Läufer ausbilden können. In der vorliegenden Arbeit wird der Einfluß dieser Überbrückung der Blechisolation untersucht.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 88
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 219-227 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary After a brief general view over signal theory, system theory and their relations the behavior of linear systems is characterized by differential equations in the case of stationary stochastic input signals for which there doesn't exist an analytical description. By means of averaging new differential equations are formed which contain the correlation functions instead of the signals. The coefficients of the differential equations are not influenced by this process. As illustrative examples two linear filters as well as a PID-controller are treated.
    Notes: Übersicht Nach einem kurzen Ausblick in die Signaltheorie und die Systemtheorie sowie deren Querverbindungen wird gezeit, wie man das Verhalten linearer Systeme auch dann durch Differentialgleichungen beschreiben kann, wenn stationäre stochastische Prozesse als Eingangssignale Verwendung finden, für die es keinen analytischen Ausdruck gibt. Durch eine geeignete Mittelwertbildung entstehen neue Differentialgleichungen, in welchen anstelle der Signale Korrelationsfunktionen auftreten. Die Koeffizienten der Differentialgleichungen bleiben dabei unverändert. Als Anwendungsbeispiele werden ein zweistufiges Filter, ein Allpaß sowie ein PID-Regler mit Verzögerung erster Ordnung behandelt.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 89
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 207-218 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary Estimating the errors committed by applying the conventional approximative expressions of the transmission line theory (for currents, tensions, short circuit impedance, open circuit admittance etc) simle formulae are derived, by which on may ascertain (using only a slide-rule) a limiting length of the line, upto which a certain accuracy is observed. The considerations are confered on derived quantities (such as input-admittance, transfered power, efficiency.) As an example the limiting lengths for a 220 kV-line are calculated if the error may not exceed 1%.
    Notes: Übersicht Auf grund einer Fehlerabschätzung werden einfache Formeln abgeleitct, die es gestatten mit wenigen Griffen am Rechenschieber festzustellen, bis zu welchen Leitungslängen einige häufig angewendete Näherungsausdrücke der Leitungstheorie (für: Spannung, Strom, Kurzschlußwiderstand, Leerlaufleitwert...) mit einer vorgeschriebenen Genauigkeit benutzt werden können. Die Überlegungen werden auf zusammengesetzte Größen (Eingangsleitwert, Leistungen, Wirkungsgrad) übertragen. Für einc 220 kV-Leitung werden die zulässigen Leitungslängen unter Forderung einer oberen Fehlergrenze von 1% (als Beispiel) angegeben.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 90
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 238-252 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Summary At non-insulated squirrel-cage rotors stray-currents may be caused through the fundamental wave and the harmonics of the rotor current within the rotor core. It is theoretically proved, that the influence of the stray-currents and their reaction on the air-gap leakage and the primary circuit can be taken into account by using a complex skewing factor χ v * in the known equations of a squirrel-cage motor for the fundamental wave as well as for the harmonics instead of the normal skewing factor χ v . This statement is not only valid for three-phase but also for two-and single-phase motors. The complex skewing factor χ v * (eqn. 23/24) is a mere numerical quantity, which is expressed through the absolute value and the phase angle and which is only dependent from the geometry, the resistance and the slip of the rotor. The effect of the stray-currents is discussed with the help of two galvanic equivalent circuits and is demonstrated by numerical results achieved for a 4 pole 15 kW-motor.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 91
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 253-265 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary The forced motion of a rotating, two-pole turbo-alternator due to mechanical unbalance and unbalanced magnetic pull is investigated. The tangential component of the magnetic pull, which is usually neglected, can be the cause of large or even unrestricted growth in the deflection, despite the presence of friction. An exact, particular integral of a linear system of differential equations with harmonic coefficients provides a possible solution to this problem of mechanical stability
    Notes: Übersicht Die erzwungene Bewegung eines rotierenden, zweipoligen Turbogenerators unter dem Einfluß von mechanischer Unwucht und magnetischem Zug wird untersucht. Die meist vernachlässigte Tangentialkomponente des magnetischen Zuges kann trotz vorhandener Reibunskraft Ursache großer, sogar unbeschränkt wachsender Auslenkungen sein. Ein exaktes partikuläres Integral eines linearen Differentialgleichungssystems mit harmonischen Koeffizienten gibt Aufschluß über dieses mechanische Stabilitätsproblem.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 92
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 266-276 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary A complete system covering the exact equations required when calculating the powers or tensions of overhead lines and aerial cables with fixed suspension points is submitted as supplement to the papers by other authors. From the exact equations, which are not very suitable for practical calculation, easily computable equations are derived for spans of all degrees of incline. These differ from the known ones in that correction factors are available as families of curves. A method using a chart diagram and having general application is given for listing installation tables.
    Notes: Übersicht Als Ergänzung der Arbeiten zahlreicher anderer Verfasser wird ein vollständiges System der exakten Formeln vorgelegt, die bei Festigkeitsberechnungen an Freileitungen und Luftkabeln mit festen Aufhängepunkten eine Rolle spielen. Aus den exakten, für das praktische Rechnen wenig geeigneten Gleichungen werden einfach zu handhabende Formeln für Spannfalder beliebiger Neigung abgeleitet, die sich von den bekannten dadurch unterscheiden, daß sie durch Korrekturfaktoren praktisch fehlerfrei gemacht sind. Die Korrekturfaktoren stehen in Form von Kurvenscharen zur Verfügung Außerdem wird ein allgemein anwendbares nomographisches Verfahren zur Aufstellung von Montagetabellen angegeben.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 93
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 277-288 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary eddy currents in a thin rotational conducting shell induced by means of an instantaneous magnetic field of axial symmetry are calculated. For this purpose, the field equations are solved by the method of separation, allowing harmonic expansions of the exciting and excited vector potential. Flux tube formulae discribing the resulting disturbed magnetic field are derived. As a special case, the sinusoidal time varying magnetic field is considered.
    Notes: Übersicht Berechnet werden die Wirbelströme in einem dünnwandigen, leitenden Rotationskörper, die durch ein zeitlich beliebig veränderliches, axialsymmetrisches Magnetfeld hervorgerufen werden. Zu diesem Zweck werden die Feldgleichungen nach der Separationsmethode gelöst, wodurch das erregende und das erregte Vektorpotential nach den Lösungsharmonischen entwickelt werden können. Abgeleitet werden ebenfalls die Gleichungen der Flußröhren, die das resultierende, gestörte magnetische Feld beschreiben Als ein Sonderfall wird das zeitlich sinusförmig veränderliche magnetische Feld betrachtet.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 94
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 289-296 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht In dieser Arbeit ist das Problem der Berechnung optimaler komplexer Übersetzungsverhältnisse der regelbaren Netztransformatoren gelöst. Es werden Übersetzungsverhältnisse von Transformatoren berechnet in parallel arbeitenden Hochspannungsübertragungssystemen von verschiedenen Nominalspannungen. Die Hauptbedingung der Optimalisation ist das Minimum der Übertragungswirkverluste des ganzen Verbundbetriebsnetzes. Abgeleitete Gleichungen zur Berechnung optimaler Werte komplexer Übersetzungsverhältnisse mit technischen Begrenzungen, die in dem Problem das Netz darstellen, benutzen moderne mathematische Methoden und können in einem Programm für eine elektronische digitale Rechenmaschine zusammengestellt werden.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 95
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 311-318 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary In consequence of the fact that the transient response in a sampled-data system is determined by the system input at the last sampling instant the ways and means which enable a controller to predict signals without causing dead-time in the transient response will be derived from the theory of linear sampled-data control systems.
    Notes: Übersicht Ausgehend von der Tatsache, daß in Systemen mit schrittweiser Signalübertragung der Verlauf der Signalgröße während des Intervalls zwischen zwei Abtastpunkten bereits zu dessen Beginn festliegt, wird die Frage untersucht, welche grundsätzliche Möglichkeiten bestehen, den Vorgang in geschlossenen Wirkungsabläufen durch Ableitung und Aufschaltung zukünftiger, mit Sicherheit vorhergesagter Werte zu beeinflussen, und welche Ergebnisse zu erwarten sind.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 96
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 332-340 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Summary The incremental susceptibility is a non-linear vector function for anisotropic material. The a. c. fields $$\vec \Delta {\rm H}$$ and $$\vec \Delta {\rm M}$$ are influenced by the biasing fields $$\vec {\rm M}_V $$ , wherby vectors have to be considered in terms of both rate and direction. A method of measurement was developed which enabled the determination of $$\vec \Delta {\rm H}$$ , $$\vec \Delta {\rm M}$$ and $$\vec {\rm M}_V $$ in sheet samples. 50% Ni−Fe-alloys having a cubic texture were examined at audio-frequency.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 97
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 395-400 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary From the equation for the capacity of an excentric cylindrical capacitor with parallel axes a diagram is derived which facilitates numerical calculations. Then approximation formulae for the capacity of cylindrical capacitors with nonparallel axes are derived. The analogous formulae for the heat flux between such conductors are given also.
    Notes: Übersicht Mit Hilfe der Gleichung für die Kapazität eines exzentrischen achsenparallelen Zylinderkondensators wird zunächst ein Diagramm zur raschen Bestimmung von Zahlenwerten gezeichnet. Sodann werden mit einem parabolischen Näherungsansatz Formeln für die Kapazität von Zylinderkondensatoren mit nichtparallelen Leiterachsen hergeleitet. Die analogen Formeln für den Wärmefluß zwischen solchen Leitern werden ebenfalls angegeben.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 98
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 407-407 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 99
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 50 (1966), S. 408-408 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 100
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 51 (1967), S. 255-261 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents By complex representation of a plane vector field a finite expression (in elementary functions) is derived for the magnetic field produced by an even number of infinitely long IOFFE bars with non-zero radial and angular extension.
    Notes: Übersicht Unter Verwendung der komplexen Darstellung eines ebenen Vektorfeldes wird ein geschlossener Ausdruck (in elementaren Funktionen) für das Magnetfeld hergeleitet, das von einer geraden Anzahl unendlich langer IOFFE-Stäbe von kreisringsektorförmigem Querschnitt erzeugt wird.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...