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  • 1
    Electronic Resource
    Electronic Resource
    Analyse des paramètres hydrobiologiques dans la remontée de Cabo Frio (Brésil) (1984)
    Springer
    Marine biology 82 (1984), S. 259-276 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract South Atlantic Central Waters (SACW) upwell close to Cabo Frio (Brazil, Rio de Janeiro) shore. The resultant typical hydrobiological conditions were studied at an anchorage station over an annual cycle from February 1973–February 1974. Multivariate analyses of hydrological and planktonic data revealed the structure of the ecosystem and the factorial relations governing its dynamics. Alternation, superposition or mixing of the water masses of different origin (Brazil current, coastal, SACW) constitute the most important factors responsible for the great hydrobiological variability observed in the study area. Spasmodic changes in wind direction and force are superimposed on a seasonal trend of more frequent upwelling in summer than during the rest of the year. The deep water is characterized by temperatures of 〈18°C, nitrate contents of 10 μg-at l-1 and by organic matter mainly composed of detritic elements from the shelf. Temperature variations together with nutrient contents (NO3 or PO4) reflect variations in primary biomass at the surface but not at 50 m depth, where detrital matter precluded valid measurements. Water of the Brazilian Current (salinity ≧36.0‰) frequently mixes with deep water of the thermal front, or with coastal water (〈35.0‰) which invades the area when south-west winds prevail. This lower-salinity water is rich in seston particles. During the study period, primary biomass was relatively low due to eutrophication. We observed less than 3 μg l-1 chlorophyll and 106 phytoplankton cells per litre: the phytoplankton populations were highly diversified, indicating an advanced degree of complexity and evolution of this ecosystem. The observed formation of a thermocline constitutes an important inducing factor for an algal bloom. Simultaneous phyto- and zooplankton maxima would induce an increased grazing rate by herbivorous zooplankton which would also partly explain the relatively low level of primary biomass. Zooplankton is as abundant here as in other great upwelling regions: 100 organisms l-1 and 200 mg organic matter m-3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392407
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  • 2
    Electronic Resource
    Electronic Resource
    3D-Characterisation of Sheet Metal and Roller Surfaces by Means of Confocal Microscopy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 6-8 (May 2005), p. 543-550 
    Details
    ISSN: 1662-8985
    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
    Notes: The measurement and evaluation of sheet metal surface characteristics is of increasing importance, due to the significant functional impact on finishing processes like forming and varnishing. For a comprehensive and useful description of textured topographies including nonstatistical characteristics, a simple profile evaluation based on 2D roughness parameters is no longer sufficient. The introduction of area-imaging white light confocal microscopy offers, in contrast to tactile profiling methods of comparable accuracy, the clear advantage of contact-free and extremely fast 3D data capture. The capabilities and benefits of this technology in interaction withsophisticated 3D area analysis methods are demonstrated by measurement examples of sheet metal and roller surfaces. A newly-developed mobile confocal measurement system for direct roller measurements is introduced
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.6-8.543.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Frequency overshoot in quartz crystal oscillators during the warm-up time. Application to the BVA resonator (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1163-1174 
    Details
    ISSN: 0392-6737
    Keywords: Mechanical properties of solids (related to microscopic structure)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Résumé Une analyse complète du phénomène de dépassement de fréquence présenté par les oscillateurs à quartz pendant leur période de démarrage est présentée. Une application particulière est faite pour les oscillateurs équipés de résonateurs à électrodes non adhérentes.
    Abstract: Riassunto Si propone un'analisi del fenomeno di overshoot che è prodotto da oscillatori del quarzo durante il tempo di riscaldamento. Si descrive una particolare applicazione ad oscillatori equipaggiati con risonatori «senza elettrodi».
    Notes: Summary An analysis of the overshoot phenomenon which is produced by quartz oscillators during the warm-up time is proposed. A particular application to oscillators equipped with «electrodeless» resonators is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457151
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal resonator design for space applications (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 595-603 
    Details
    ISSN: 0392-6737
    Keywords: Piezoelectricity and electrostriction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Crystal resonators may be used on various vehicles. They are submitted to accelerations, shocks, vibrations and to external pressure and temperature variations (acceleration variations may be some 10g, pressure variations may reach one atmosphere and temperature 100°C). The goal of this paper is to describe an attempt to reduce the various environmental effects especially by use of a mounting structure external to the resonator. Each effect needs a particular study. 1) Shocks and vibrations. A particular fixation structure has been designed. Resonators can support a shock equivalent to 1000g over 0.1 ms in any direction. Also the mounting structure resonant frequency can be rejected over 3000 Hz. 2)g sensitivity.g sensitivity has been reduced. Theoretical and experimental results are given. 3) External pressure and temperature variations. Crystal enclosure is submitted to variations of pressure and temperature which yield enclosure deformations. The study of the resonator dependence by respect to its enclosure has been performed. A quartz structure surrounding the vibrating crystal has been designed and specific enclosures have been tried thus yielding reduced mechanical strains due to external pressure and temperature variations. These structures are described and discussed. Based on the results of the previous study of a series of 10 sample resonators has been manufactured. The performances are presented and compared to results obtained with previous designs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462346
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of force-frequency effect of piezoelectric circular resonators strained by edge angular-sector stresses (1985)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 6 (1985), S. 574-584 
    Details
    ISSN: 0392-6737
    Keywords: Piezoelectric and electrostriction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si compie un'analisi teorica dell'effetto forza-frequenza su due pesi opposti distribuiti su una porzione angolare dell'orlo del cristallo nel caso di un risonatore o di un sensore piezoelettrico. Si determinano attriti al centro del cristallo e si calcola il conseguente slittamento di frequenza. Applicando i risultati ottenuti, la posizione e l'ampiezza angolare dei portatori sono determinate per un taglio AT.
    Abstract: Резюме Проводится теоретический анализ частотно-силового эффеекта для двух противоположных нагрузок, распределенных по утловому сектору края кристалла в случае пьезоэлектрического резонатора или датчика. Определяются напряжения в центре кристалла и расчитывается соответствующий сдвит частоты. С помощйю полученных результатов определяются расположение и угловая ширина держателей для AT-среза.
    Notes: Summary A theoretical analysis of force-frequency effect of two opposite loads distributed over an angular part of the crystal edge is performed in the case of a piezoelectric resonator or sensor. Stresses are determined at the centre of the crystal and the subsequent frequency shift is calculated. Applying the obtained results, the location and angular width of holders are determined for an AT-cut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450593
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  • 6
    Electronic Resource
    Electronic Resource
    Characteristics of heated sensors emitting by radiation only
    Amsterdam : Elsevier
    Sensors and Actuators A: Physical 40 (1994), S. 173-178 
    Details
    ISSN: 0924-4247
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0924-4247(94)87002-0
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  • 7
    Electronic Resource
    Electronic Resource
    Energy levels of "7"1^1^7^0Lu
    Amsterdam : Elsevier
    Nuclear Physics, Section A 131 (1969), S. 193-224 
    Details
    ISSN: 0375-9474
    Keywords: Radioactivity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(69)90819-7
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  • 8
    Electronic Resource
    Electronic Resource
    Le spectre d'electrons Auger L de la desintegration 175Hf175Lu
    Amsterdam : Elsevier
    Nuclear Physics, Section A 120 (1968), S. 321-328 
    Details
    ISSN: 0375-9474
    Keywords: Atomic physics ; Radioactivity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(68)90768-9
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  • 9
    Electronic Resource
    Electronic Resource
    Niveaux de 171Yb obtenus par desintegration de 171Lu
    Amsterdam : Elsevier
    Nuclear Physics, Section A 138 (1969), S. 33-48 
    Details
    ISSN: 0375-9474
    Keywords: RADIOACTIVITY
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(69)90378-9
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  • 10
    Electronic Resource
    Electronic Resource
    π^0 electroproduction at the first resonance at momentum transfers q^2 = 0.6, 1.0 and 1.56 GeV^2
    Amsterdam : Elsevier
    Nuclear Physics, Section B 46 (1972), S. 573-592 
    Details
    ISSN: 0550-3213
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0550-3213(72)90087-9
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