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  • Springer  (90)
  • EMBO Press  (27)
  • Oxford University Press  (10)
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  • 1
    Digitale Medien
    Digitale Medien
    An upper limit on the aperture separation of ion drift meters (1982)
    Springer
    Astrophysics and space science 83 (1982), S. 37-49 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An upper limit has been calculated on the effective aperture separation or detector thickness of ion drift meters of two fundamental types. The limit applies to meters which compare currents collected by detectors with different view directions at the same retarding potential and to meters which measure the entire thermal ion distribution function. For both types, a single scanned detector may be employed instead of multiple detectors, in which case the limit applies to twice the radius of curvature of the path followed by the detector aperture during a scan, (i.e. the diameter of a spinning payload). The limit was found to be important in two cases. First, in the F region on spacecraft with stringent electrostatic cleanliness requirements, the 10% error limit was found to be 40 cm. Second, in the E region, the limit was found to be ≲1 cm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00648537
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  • 2
    Digitale Medien
    Digitale Medien
    Beiträge zur Analyse des Vorganges der technischen Magnetisierung (1937)
    Springer
    The European physical journal 105 (1937), S. 676-697 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Zusammenfassung Über die Wechselwirkung der Elementarbereiche. — Messungen zur Klärung der Wirksamkeit des inneren Feldes und der inneren Materialveränderung, die schließ-lich zu makroskopischen Sprüngen Anlaß gibt. — Theoretisches über den Zusammenhang von innerem Feld und makroskopischen Sprüngen. — Prüfung der Beziehung zwischen innerem Feld und makroskopischen Sprüngen. — Ergebnis der Untersuchung.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01330654
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  • 3
    Digitale Medien
    Digitale Medien
    Dynamical and thermal aspects of relativistic heavy-ion collisions (1991)
    Springer
    The European physical journal 340 (1991), S. 287-295 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.−z ; 25.70.Np
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Within a covariant BUU-approach we simulate heavyion collisions at various bombarding energies from 400 MeV/u to 1 GeV/u. We evaluate locally the energymomentum tensorT μv (x), and extract pressures, energydensities and temperatures. The connection of these thermodynamical quantities to experimental observables and their sensitivity to the equation of state is discussed. Furthermore, we investigate the question of local equilibration and evaluate the entropy produced in these reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294677
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  • 4
    Digitale Medien
    Digitale Medien
    Die Wirkung von Na3[Ca-DTPA] auf den Glykogengehalt von Niere und Leber der Ratte (1969)
    Springer
    Cellular and molecular life sciences 25 (1969), S. 509-511 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary DTPA, a derivative of EDTA, in doses of 1, 2, 4, and 8 mmoles kg−1/d −1 causes a histochemically detectable increase of glycogen in the kidneys and a decrease of glycogen in the liver of rats. Furthermore, a severe damage of the intestinal mucosa has been demonstrated; its possible relevance for the pathogenesis of the other findings is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01900789
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  • 5
    Digitale Medien
    Digitale Medien
    Die Kristallstruktur von Chudobait, (Mg, Zn)5H2[AsO4]4·10H2O (1976)
    Springer
    Naturwissenschaften 63 (1976), S. 243-243 
    Details
    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/BF00610915
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  • 6
    Digitale Medien
    Digitale Medien
    Spectroscopy of alloying and low-pressure elements with the thermionic diode (1985)
    Springer
    Applied physics 36 (1985), S. 177-180 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.20 ; 35.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We describe a simple modification of the thermionic heat-pipe diode which allows to study spectroscopically alloying and low-pressure elements. The function and the potential of the modified diode is demonstrated by measuring Doppler-free two-photon lines in gallium, indium and thallium.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704571
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  • 7
    Digitale Medien
    Digitale Medien
    Effects of Menstrual History and Use of Medications on Bone Mineral Density: The EVOS Study (1998)
    Springer
    Calcified tissue international 63 (1998), S. 271-276 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Key words: Bone mineral density — Epidemiology — Osteoporosis — Menopause — Medication use.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Abstract: We have previously shown considerable between-center variation in bone mineral density (BMD) in the 13 EVOS centers that performed bone densitometry on their sex- and age-stratified population samples, after adjusting for weight and age. We have now investigated whether part of the between-center variability may be attributed to between-center variations in the use of medications. Information was collected from 2088 women and 1908 men at baseline on whether the subjects had ever been prescribed calcium, calcitonin, anabolic steroids, fluoride, vitamin D, or glucocorticoids and, for the women, whether they had ever used the oral contraceptive pill (OCP) or hormone replacement therapy (HRT). Each of these variables was fitted into a regression model adjusted for age, height, weight, and center. Only OCP and HRT significantly affected BMD. Those who had ever used OCPs had spinal BMD 0.029 g/cm2 greater than those who had never used them. Users of HRT had higher BMD than nonusers: 0.037 g/cm2 at the spine, 0.018 g/cm2 at the trochanter, and 0.018 g/cm2 at the femoral neck. As expected, there was a great variation between centers in the use of OCP and HRT, but there were no significant correlations between mean BMD at any site in a given center and the prevalence of OCP or HRT use in that center. The between-center variance in BMD at all three sites remained highly significant after adjusting for treatment (P 〈 0.001). We conclude that HRT and OCP use are associated with moderate increases in BMD. The geographical variability of BMD in Europe was not explained by treatment with pharmaceuticals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002239900525
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  • 8
    Digitale Medien
    Digitale Medien
    Influence of Body Composition on Quantitative Ultrasound Parameters of the Os Calcis in a Population-Based Sample of Pre- and Postmenopausal Women (2000)
    Springer
    Calcified tissue international 66 (2000), S. 5-10 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Key words: Ultrasound densitometry — Body composition — Fat mass — Lean body mass — Epidemiology.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Abstract. Body mass is known to be related to measures of bone mineral density (BMD) as well as to parameters of quantitative ultrasound (US). To examine the effect of the body compartment's fat mass and lean body mass on quantitative ultrasonic bone parameters, data from a sample of 3241 German women were analyzed. Anthropometric measures, including skinfold thickness, were obtained from standardized measurements, and fat and lean body mass were derived from classical regression formulas based on skinfold measurements. Ultrasonic bone measurements were performed on the right os calcis, and speed of sound (SOS) and broadband ultrasound attenuation (BUA) were determined. Women were grouped into pre- and postmenopausal status; postmenopausal women were further stratified into ever and never hormone-replacement user. Correlation analysis indicated lean body mass to be stronger correlated with BUA than fat mass in both pre- (r = 0.23; P= 0.0001) and postmenopausal women with (r = 0.19; P= 0.0001) and without hormone replacement therapy (HRT) (r = 0.26; p = 0.0001). SOS demonstrated very small or no associations with body mass or its components. Multiple linear regression models were used to describe the relationship among body weight, fat mass, and lean body mass on BUA after adjustment for confounding variables. Both in pre- and postmenopausal women lean body mass was more strongly related to BUA than fat mass. However, body mass measures explained only small amounts of the overall variance in BUA (R2= 1–3% in premenopausal women; R2= 1% postmenopausal with HRT; R2= 4–5% in postmenopausal women without HRT). In conclusion, the strong influence of body mass and its components previously reported for BMD was not observed for quantitative ultrasonic bone parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002230050002
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  • 9
    Digitale Medien
    Digitale Medien
    Litholog and structure of the Grenville-aged (≈1.1 Ga) basement of heimefrontfjella (East Antarctica) (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 800-821 
    Details
    ISSN: 1437-3262
    Schlagwort(e): East Antarctica ; Greenville ; Pan-African ; Rodinia ; Heimefrontfjella
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The Heimefrontfjella mountains, Western Dronning Maud Land (East Antarctica), are dominantly composed of Grenville-aged (≈ 1.1 Ga) rocks, which were reworked during the Pan -African orogeny at ≈500 Ma. Three discontinuity-bounded Grenville-aged terranes have been recognized namely (from north to south) the Kottas, Sivorg and Vardeklettane terranes. The terranes contain their own characteristic lithological assemblages, although each is made up of an early supracrustal sequence of metavolcanic and/or metasedimentary gneisses, intruded by various (predominantly granitoid) suites. No older basement upon which the protoliths of these older gneisses were deposited has been recognized. In each terrane the older layered gneisses were intruded by various plutonic suites ranging in age from ≈ 1150 to ≈1000 Ma. The Vardeklettane terrane is characterized by abundant charnockites and two-pyroxene granulite facies parageneses in metabasites, whereas the Sivorg and Kottas terranes were metamorphosed to amphibolite facies grade. P-T estimates show that peak metamorphic conditions changed from ≈600°C at 8 kbar in the south, to ≈700 °C at 4 kbar in the northern Sivorg terrane. Regional greenschist retrogression of high-grade assemblages may be of Pan-African age. The Heimefrontfjella terranes were juxtaposed and pervasively deformed during a complex and protracted period of E-W collision orogenesis in a transpressive regime at ≈ 1.1 Ga. This is manifest as early, gently dipping thrust-related shear fabrics (D1), succeeded by the initiation of an important (D2) steep dextral shear zone (Heimefront shear zone, HSZ), during which the early fabrics and structures were steepened and rotated in an anticlockwise sense. The HSZ is a curvilinear structure which changes from a dextral oblique strike-slip lateral ramp in the north to a steep dip-slip frontal ramp in the south, where it forms the boundary between the Sivorg and Vardeklettane terranes. The Pan-African event is manifested as discrete, low- to medium-temperature ductile to brittle shears (D3) and numerous K/Ar cooling ages.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02440112
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  • 10
    Digitale Medien
    Digitale Medien
    Age and degree of metamorphism and time of nappe emplacement along the southern margin of the Damara Orogen/Namibia (SW-Africa) (1978)
    Springer
    International journal of earth sciences 67 (1978), S. 719-742 
    Details
    ISSN: 1437-3262
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Beschreibung / Inhaltsverzeichnis: Abstract Along the southern margin of the Damara orogen age and degree of metamorphism were determined by means of K/Ar dating and illite crystallinity. The investigations include the following units: 1. The southwestern-most part of the east-west striking branch of the Damara orogen. 2. The nappes of the Naukluft Mountains. 3. The Nama-Group from north of the Naukluft Mountains to the Fish River in the south (including the western part of the Dwyka-Formation). The metamorphism of the Naukluft nappes as well as the underlying Nama beds corresponds to the higher part of the anchi-zone and lower epi-zone. Between the Naukluft nappes and the folded Nama rocks adjoining the southeastern front of the nappes there is an obvious step from higher down to lower metamorphism. Further to the southeast the metamorphism in the Nama beds decreases continuously down to diagenesis. K/Ar age determinations were carried out on the three units mentioned above and also on the basement underlying the Nama sequence. Muscovites of this basement gave an age of about 1160 m. y. Determinations on white micas of the southern Damara belt, the Naukluft Mountains and the northern Nama basin define two isochrons with ages of 495 and 530 m. y The age of 530 m. y. represents the peak of metamorphism and the age of syncrystalline deformation. The age of 495 m. y. can be interpreted as a cooling age of the higher metamorphic rocks or as a dating of rejuvenation caused by a second post-crystalline deformation in parts of the Naukluft and Damara rocks. This age of 495 m. y. was also found in the mylonite of the main thrust plane of the Naukluft nappes and it represents the time of emplacement of the Naukluft nappes.
    Kurzfassung: Résumé L'âge et le degré de métamorphisme de la bordure sud de l'orogène de Damara ont été déterminés par la datation K/Ar et par la cristallinité de l'illite. Les investigations ont porté sur les unités suivantes: 1. La partie sud-ouest de la branche orientée est-ouest de l'orogène de Damara. 2. Les nappes du «Naukluft». 3. Le «Nama group» s'étendant du N du Naukluft au Fish-river au sud (la partie occidentale de la formation Dwyka inclue). Le métamorphisme des nappes du Naukluft ainsi que de la série de Nama sousjacente va de la partie supérieure de l'anchizone à l'épizone inférieure. Entre les nappes du Naukluft et les roches plissées de Nama situées au sud-est des nappes, un saut très net est observé conduisant à un métamorphisme plus bas. Vers le sud-est, le métamorphisme affectant la série de Nama diminue graduellement jusque dans le domaine de la diagenèse. Des déterminations d'âge K/Ar ont été effectuées sur les trois unités ci-dessus et en plus sur le soubassement du groupe de la Nama, dont les muscovites donnent un âge d'environ 1160 m. a. Les résultats des déterminations dans des micas clairs du Damara du sud, des nappes du Naukluft et du groupe nord de Nama se situent sur deux isochrones avec des âges de 495 et 530 m. a. L'âge de 530 m. a. indique le point culminant du métamorphisme et l'âge de la déformation dans les roches à déformation syncristalline. L'âge de 495 m. a. peut être interprété comme un âge de refroidissement des roches les plus métamorphiques ou comme un rajeunissement par une deuxième déformation postcristalline dans certaines parties des formations du Naukluft et du Damara. Cet âge de 495 m. a. a été trouvé également pour les mylonites du plan de chevauchement principal des nappes du Naukluft et indique l'âge de la mise en place de ces nappes.
    Notizen: Zusammenfassung Im Bereich der Südgrenze des Damara-Orogens wurden Alter und Intensität der Metamorphose mit Hilfe von K/Ar-Altersbestimmungen und Illitkristallinität bestimmt. Die Untersuchungen umfaßten folgende Einheiten: 1. den südwestlichen Teil des E-W streichenden Astes des Damara-Orogens; 2. die Decken der Naukluft; 3. die Nama-Group, die sich von nördlich der Naukluft bis zum Fish-River im Süden erstreckt (einschließlich des westlichen Teils der Dwyka-Formation). Die Metamorphose der Naukluft-Decken sowie der unterlagernden Nama liegt in Bereich der höheren Anchibis unteren Epizone. Zwischen den Gesteinen der Naukluft-Decken und der südöstlich vorgelagerten gefalteten Nama besteht ein deutlicher Sprung zu niedrigerer Metamorphose. In Richtung SE nimmt der Grad der Metamorphose in der Nama kontinuierlich ab bis in den Bereich der Diagenese. In den drei oben erwähnten Einheiten wurden K/Ar-Altersbestimmungen an Hellglimmern durchgeführt. Zusätzlich wurden Muskowite aus dem Basement, das die Nama unterlagert, datiert. Die Muskowite aus dem Basement ergaben ein Alter von 1160 m. y. Bestimmungen an Hellglimmern des südlichen Damara, der Naukluft und der nördlichen Nama liegen auf zwei Isochronen mit Altern von 495 m. y. und 530 m. y. Das Alter von 530 m. y. datiert den Höhepunkt der Metamorphose und das Alter der Deformation in den synkristallin deformierten Gesteinen. Das Alter von 495 m. y. kann als Abkühlungsalter für die höher metamorphen Gesteine gedeutet werden oder zeigt eine Verjüngung durch eine zweite postkristalline Deformation in Teilen der Naukluft und Damara-Gesteine an. Dieses Alter von 495 m. y. wurde ebenfalls im Mylonit der Hauptüberschiebungsbahn der Naukluft-Decken gefunden und gibt den Zeitpunkt der Platznahme der Naukluft-Decken an.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01802814
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