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  • 1
    Electronic Resource
    Electronic Resource
    Femtosecond demodulation source for high-resolution submillimeter spectroscopy (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3810-3812 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new continuously tunable submillimeter source for spectroscopy and other high-resolution applications has been developed. In this source the optical spectrum of a mode-locked femtosecond laser is downconverted into the submillimeter region by the demodulation process of a photoconductive switch. The power generated is subsequently radiated into free space by an antenna which is integrated along with the switch on low-temperature grown GaAs. The very high resolution is ultimately traceable to the cavity length of the laser and the stable mode-lock frequency which results. Among the most important attributes of the sources are straightforward absolute frequency calibration, very high spectral purity, and the potential for spectral multiplexing. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115391
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  • 2
    Electronic Resource
    Electronic Resource
    Generation of picosecond pulses at millimeter wavelengths (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1483-1485 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report here on an experiment in which picosecond electron pulses, produced by a compact radiation frequency (rf) electron gun, were used to excite a rectangular waveguide, generating 5 ps pulses of radiation with a bandwidth of ∼200 GHz. The interaction of the electron pulses with the waveguide can be modeled quite simply by performing a harmonic expansion of the pulse train produced by the electron gun and employing Poynting's theorem to compute the power coupled into the modes of the waveguide by each harmonic. The resulting model for the distribution of spectral power yields good agreement with the observed spectrum. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114502
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  • 3
    Electronic Resource
    Electronic Resource
    Direct observation of orientation limit in a fast photorefractive polymer composite (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2253-2255 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a photorefractive polymer with a 4-ms-response time in transient four-wave mixing experiments at 0.5 W/cm2 writing irradiance, 95 V/μm applied electric field, and a grating period of 3.1 μm. Complementary transient ellipsometry, however, reveals orientational birefringence response which leads the four-wave mixing response all the way to its saturation, despite complex dynamics in these processes. Orientation does not limit the dynamic formation of photorefractive gratings in this polymer, which suggests that even faster photorefractive responses are possible for polymer composites with improved charge generation and transport properties. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123816
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  • 4
    Electronic Resource
    Electronic Resource
    Flight by Man-Power (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 419-419 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We agree2 that for mechanical similarity the power requirement is a function of (weight)1*167. Moreover, for flying insects and birds3 we obtained from Putter's data a different exponent for this statistical relationship, namely (weight)0*667. It is interesting to note that according to the theory ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/187419a0
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  • 5
    Electronic Resource
    Electronic Resource
    NBS-SURF calibrations: Use in NASA stratosphere and climate programs
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 172 (1980), S. 93-96 
    Details
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-554X(80)90616-3
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  • 6
    Electronic Resource
    Electronic Resource
    Design and operation of a variable high-temperature oxygen partial-pressure probe device for solid-state NMR
    Amsterdam : Elsevier
    Journal of Magnetic Resonance (1969) 87 (1990), S. 160-165 
    Details
    ISSN: 0022-2364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2364(90)90094-P
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  • 7
    Electronic Resource
    Electronic Resource
    Theory of biological similarities, nondimensional parameters and invariant numbers (1966)
    Springer
    Bulletin of mathematical biology 28 (1966), S. 91-102 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract In previous papers (1955–1957) a theory of biological similarity was established, assuming that the limits are the mechanical and the electrodynamical similarity criteria. The range of this theory lies between the coefficient of the time exponent (γ) for mechanical (0.5γ) and electrodynamical (1.0γ) similarities, being the mode 0.93γ. Moreover, for certain functions this restricted theoretical range should be extended to the hydrodynamical similarity criterion (2γ), so that the dimensionless numbers commonly used in Physics (Reynolds, Froude, Weber, etc.) can be included within the total range (0.5–2γ) of biological similarities. From dimensional analysis of physiological, functions it was possible to obtain, by means of dimensional and solution matrices, a group of “nondimensional numbers” by applying Buckingham's Pi-theorem. Nevertheless, only if a single similarity criterion was applied, the residual weight exponent was exactly zero; in all other instances the weight exponent was not zero, due to the existence of a range for biological similarities and to the statistical meaning of exponent (b) of the allometric equations. From the similarity criteria “invariant numbers” can be obtained, by means of which it is possible to establish correlations between numerous morphological and physiological characteristics of a particular system (circulation, respiration, metabolism, etc.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476392
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  • 8
    Electronic Resource
    Electronic Resource
    171. Chirurgie des Hyperparathyreoidismus (1976)
    Springer
    Langenbeck's archives of surgery 342 (1976), S. 622-622 
    Details
    ISSN: 1435-2451
    Keywords: Hyperparathyroidism ; Morphology ; Location ; Results ; Hyperparathyreoidismus ; Morphologie ; Lokalisation ; Ergebnisse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Von 1960–1975 wurden 117 Patienten wegen eines Hyperparathyreoidismus operiert, davon 87% wegen primären, 8% wegen sekundären und 5% wegen tertiären. Beim primären Hyperparathyreoidismus waren die adenomatös bzw. hyperplastisch veränderten Epithelkörperchen in 76,4% parathyreoidal, in 6,2% intrathyreoidal, in 10,7% mediastinal und in 6,7% an anderer Stelle lokalisiert. Bei der Nachkontrolle waren 70 Patienten beschwerdefrei, 14 meist an anderen Ursachen verstorben. Die Frühletalität betrug 6%.
    Notes: Summary From 1960 to 1975 a total of 117 patients were operated on for hyperparathyroidism; 87 percent of these suffered from primary hyperparathyroidism, 8 percent from secondary and 5 percent from tertiary hyperparathyroidism. Location of the parathyroid glands with adenomatous or hyperplastic changes was parathyroid in 76.4 percent of the cases of primary hyperparathyroidism, intrathyroidal in 6.2 percent, mediastinal in 10.7 percent and at other sites in 6.7 percent. Follow-up examination revealed 70 patients to be free of symptoms, while 14 had died from various causes. The early lethality was 6 percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01267519
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  • 9
    Electronic Resource
    Electronic Resource
    245. Die Arteriosklerose als chirurgische Aufgabe (1975)
    Springer
    Langenbeck's archives of surgery 339 (1975), S. 757-757 
    Details
    ISSN: 1435-2451
    Keywords: Arteriosclerosis ; Surgical treatment ; Late results ; Arteriosklerose ; Chirurgische Behandlung ; Spatergebnisse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Spatergebnisse der rekonstruktiven Arterienchirurgie werden an 5245 operierten Kranken der Chirurgischen Universitätskliniken Köln und München (1959–1974) dargestellt. Die Eingriffe bei cerebrovasculärer Insuffizienz (378 Kranke), renovasculärer Hypertonie (257 Kranke) and Angina intestinalis (24 Pat.) ermöglichen bei niedriger operativer Letalität and Morbidität eine Lebensverlängerung, bei Verschlüssen im Aorta-Iliaca-Bereich (2547 Pat.) and am femoro-poplitealen Abschnitt (1440 Pat.) gilt die Erhaltung der Extremität als therapeutisches Ziel. Bei peripheren (303 Pat.) and Aortenaneurysmen (296 Pat.) ist fur ein gutes Behandlungsergebnis der frühzeitige Eingriff vor dem Auftreten von Komplikationen (Thromboembolie bzw. Ruptur) Voraussetzung.
    Notes: Summary The long-term follow-up results of reconstructive vascular surgery are demonstrated in 5245 patients operated on in the University Surgical Clinics in Cologne and Munich (1959–1974). With low surgical lethality and morbidity, operative treatment of cerebrovascular insufficiency (378 patients) or renovascular hypertension (257 patients) guarantees longer survival. In cases of aorto-iliacal (2547 patients) and femoropopliteal (1440 patients) occlusion, the object of therapy is the preservation of the extremity. For good results, operative treatment of peripheral and aortic aneurysms should be performed before complications such as thromboembilism or rupture of the aneurysm occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01257723
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  • 10
    Electronic Resource
    Electronic Resource
    NMR Study of Aluminium Diffusion in Solid Noble Metal: Al Alloys (1987)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 15-18 (Jan. 1987), p. 437-442 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/00/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.15-18.437.pdf
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