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Digitale Medien

Observations of sources of maser radio emission having an angular resolution of 0.2 msec of arc (1973)

Burke, B. F. ; Johnston, K. D. ; Efanov, V. A. ; [weitere]

Springer

Radiophysics and quantum electronics 16 (1973), S. 613-616

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ISSN: 1573-9120

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01033503

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2

Digitale Medien

The mechanism of discharge of sintered plate cadmium electrodes (1972)

Armstrong, R. D. ; Sperrin, A. D. ; Tye, F. L. ; [weitere]

Springer

Journal of applied electrochemistry 2 (1972), S. 265-273

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ISSN: 1572-8838

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: Abstract Sintered plate Cd electrodes have been studied in alkaline solutions using potentiostatic and galvanostatic techniques. The behaviour is, in many ways, similar to that of a flat Cd electrode. A pseudo steady-state current is found due to the dissolution of Cd as Cd(OH)2−4. At more anodic potentials passivation occurs due to the solid state formation of Cd(OH)2. This model can account for the results obtained on galvanostatic discharge.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00615273

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3

Digitale Medien

Buchbesprechungen (1973)

Kuhn-Schnyder, E. ; Dose, K. ; Bühler, W. ; [weitere]

Springer

Naturwissenschaften 60 (1973), S. 210-214

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ISSN: 1432-1904

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00599450

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4

Digitale Medien

Elastic strain and composition of self-assembled GeSi nanoislands on Si(001) (2000)

Vostokov, N. V. ; Gusev, S. A. ; Dolgov, I. V. ; [weitere]

Springer

Semiconductors 34 (2000), S. 6-10

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ISSN: 1063-7826

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract The growth of self-assembled Ge islands on Si(001) surface and changes in the island structure parameters in the course of subsequent annealing were studied. Island structures possessing a small (∼6%) scatter with respect to lateral dimensions and heights of the islands were obtained. The Raman spectra and X-ray diffraction data show evidence that silicon dissolves in the islands. The atomic fraction of Si in the resulting SixGe1−x solid solution was determined and the elastic strain in the islands was measured. It was found that annealing of the heterostructures with islands is accompanied by increasing Si fraction in the islands, which leads to changes in the island shape and size.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.1187942

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5

Digitale Medien

Lasing in the vertical direction in InGaN/GaN/AlGaN structures with InGaN quantum dots (2000)

Krestnikov, I. L. ; Sakharov, A. V. ; Lundin, W. V. ; [weitere]

Springer

Semiconductors 34 (2000), S. 481-487

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ISSN: 1063-7826

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract InGaN/GaN structures with dense arrays of InGaN nanodomains were grown by metallorganic chemical vapor deposition. Lasing in vertical direction occurs at low temperatures, indicating ultrahigh gains (∼ 105 cm−1) in the active region. Fabrication of an effective AlGaN/GaN distributed Bragg reflector with reflectivity exceeding 90% enables vertical lasing at room temperature in structures with a bottom distributed Bragg reflector, despite the absence of a well-reflecting upper mirror. The lasing wavelength is 401 nm, and the threshold excitation density is 400 kW/cm2.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.1188011

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6

Digitale Medien

Stability of periodic modes in n-tuned interacting oscillators having a nonlinear p-n-junction (1973)

Donevski, B. D. ; Bainov, D. D.

Springer

Radiophysics and quantum electronics 16 (1973), S. 790-794

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ISSN: 1573-9120

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01031344

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7

Unbekannt

Buchbesprechungen (1973)

Kuhn-Schnyder, E. ; Dose, K. ; B�hler, W. ; [weitere]

Springer

In: The Science of Nature - Naturwissenschaften. 1973; 60(4): 210-214. Published 1973 Apr 01. doi: 10.1007/bf00599450.

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Publikationsdatum: 1973-04-01

Print ISSN: 0028-1042

Digitale ISSN: 1432-1904

Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft

Publiziert von Springer

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8

Digitale Medien

Influence of nonlinearly induced diffraction on spatial solitary waves (2000)

Boardman, A. D. ; Marinov, K. ; Pushkarov, D. I. ; [weitere]

Springer

Optical and quantum electronics 32 (2000), S. 49-62

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ISSN: 1572-817X

Schlagwort(e): Kerr-type of nonlinearity ; planar optical waveguides ; self-focussing of optical beams ; spatial solitary waves

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract Spatial solitary waves carried by a TE mode in planar optical waveguides with Kerr-type of nonlinearity are investigated based on a modified nonlinear (1 + 1) Schrödinger equation. Looking for effects instigated by the spatial inhomogeneity of the nonlinear polarization, the nonzero divE-term is taken into account in the nonlinear guided wave equation together with the nonparaxial approach and vector model. It is shown that, at self-focusing of beams in a (1 + 1) geometry, the effect coming out from the divergence term predominates over modifications related to the nonparaxial vector model. This term is interpreted as nonlinearly induced diffraction which plays the role of an effective saturation. Analytical solutions supported by numerical results are found.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1007045304098

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9

Digitale Medien

Analysis of propagation in a SELFOC fibre: The axial field component and the effect of multiple reflections (1972)

Tewari, D. P. ; Tripathi, V. K. ; Kamal, Jyoti ; [weitere]

Springer

Optical and quantum electronics 4 (1972), S. 51-55

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ISSN: 1572-817X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract Based on the WKB solution of the wave equation, a discussion of the polarization rotation of Gaussian beams in focusing fibres is given. Near the focusing region the change of polarization has been found to be appreciable. The finite longitudinal size of fibres has been found to reduce the effective length of samples for wave focusing.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01418400

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10

Digitale Medien

Proposed method of spike suppression in solid-state lasers (1972)

Bhawalkar, D. D. ; Nair, L. G.

Springer

Optical and quantum electronics 4 (1972), S. 225-234

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ISSN: 1572-817X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract A method is proposed to suppress the spikes in the output of solid-state lasers, using passive negative feedback. A saturable absorber, normally used for Q-switching the laser, is used in a modified laser resonator, so that the resonator losses increase with laser intensity. The rate equations of a laser with such a loss mechanism are solved numerically. Numerical results for a ruby laser are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02334393

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