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  • 11
    Electronic Resource
    Electronic Resource
    Numerical calculations on magnetic circuits
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 19 (1980), S. 301-319 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(80)90619-8
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Permanent magnetic excitation of rotating and linear synchronous machines
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 9 (1978), S. 173-178 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(78)90046-X
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Experimental evidence for a second transition due to Ising ions in amorphous Heisenberg spin glasses
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 1676-1678 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)91506-O
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  • 14
    Electronic Resource
    Electronic Resource
    Parity and bone mineral density in middle-aged women (1994)
    Springer
    Osteoporosis international 4 (1994), S. 162-166 
    Details
    ISSN: 1433-2965
    Keywords: Bone mineral density ; Parity ; Women
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A retrospective study was carried out to determine the relationship between parity and bone mineral density (BMD) in middle-aged women. Eight hundred and twenty-five woman aged 41–76 years were recruited from four general practice registers in Cambridge. Subjects were unselected as to their health status. Each subject completed a detailed health questionnaire. Participation rate was 50%. The main outcome measure was BMD measured at the spine (L2–4,n=825) and hip (neck, intertrochanter and Ward's triangle;n=817) by dual-energy X-ray absorptiometry (DXA) using the Hologic QDR-1000 densitometer. It was found that the unadjusted mean BMD was significantly higher at all sites among the parous women (p=0.031 to 〈0.00001), and remained significantly higher at the femoral neck (p=0.025), intertrochanter (p=0.001) and Ward's triangle (p=0.045) after adjusting for age and body mass index (BMI). Similar findings were seen after stratifying for potential confounding variables. There was a consistent upward trend of BMD with increasing parity at all sites. Parity remained a significant independent predictor of BMD at all sites after controlling for age, BMI, menopausal status, oral contraceptive and hormone replacement therapy use, smoking status and breast-feeding status in multiple linear regression analyses. There was, on average, a 1.0% increase in BMD per live birth. Our findings therefore suggest a positive relationship between parity and bone mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623063
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  • 15
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    Unknown
    Notes on Tactics for Ships and Weapons of the Present Day (with Diagrams) (Part I) (1897)
    London : Periodicals Archive Online (PAO)
    The RUSI journal. 41 Part 1 (1897:Jan./June) 48 
    Details
    ISSN: 0307-1847
    Topics: Political Science
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:p225-1897-041-01-000003
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  • 16
    facet.materialart.
    Unknown
    Notes on Tactics for Ships and Weapons of the Present Day (with Diagrams) (Part II) (1897)
    London : Periodicals Archive Online (PAO)
    The RUSI journal. 41 Part 1 (1897:Jan./June) 201 
    Details
    ISSN: 0307-1847
    Topics: Political Science
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:p225-1897-041-01-000012
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  • 17
    Electronic Resource
    Electronic Resource
    Feldkurven und Einfluß der Nutung in permanenterregten Synchronmaschinen (1977)
    Springer
    Electrical engineering 59 (1977), S. 243-251 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents A numerical method of field computation is used to define some fundamentals which are necessary for calculating the magnetic fields in permanentic synchronous machines with the aid of simplified methods. The predicted air-gap flux-density waves are first given for the case of a smooth armature surface. The effect of slotting is then taken into account by defining two different Carter coefficients. The first one gives the ratio of the air-gap flux-density of an armature with a smooth surface to that of a slotted one, while the other gives the ratio of the effective to the geometrical air-gap length. A fringing coefficient is given in the form of curves enabling the prediction of these factors.
    Notes: Übersicht Ein numerisches Feldberechnungsverfahren wird dazu verwendet, erforderliche Grundlagen zur Berechnung der magnetischen Felder in permanenterregten Synchronmaschinen mit Hilfe vereinfachter Berechnungsmethoden zu ermitteln. Hierzu gehören in erster Linie die Feldkurven bei glattem Anker. Zur Erfassung des Nutungseinflusses werden zwangsläufig zwei verschiedene Cartersche Faktoren eingeführt. Der eine beschreibt das Verhältnis der Induktion bei glattem zu der bei genutetem Anker und der andere das Verhältnis der effektiven zur geometrischen Luftspaltlänge. Die Kurvenverläufe einer Hilfsgröße zur Ermittlung dieser beiden Faktoren werden angegeben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573989
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    Paper (German National Licenses)
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  • 18
    Electronic Resource
    Electronic Resource
    Grenzen von MOS-Speicherzellen (1981)
    Springer
    Electrical engineering 63 (1981), S. 327-336 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The behaviour of MOS Field-Effect-Transistors with submicrometer channel lengths is investigated with the aid of different models describing short-channel-effects. Beyond classical limitations of the channel length determined by punchthrough, breakdown and hot electrons a further limit is shown resulting of the threshold voltage sensitivity of the circuit. The threshold voltage depends strongly on the channel length. MOSFETs of an area of 0.06 μm2 with supply voltages of 1 V seem possible, permitting the design of memory cells with a minimum cell area of 0.1 μm2 (dynamic) respectively 1.1 μm2 for a static 6-device cell. Because of the improved characteristics of the transistors low temperature operation of such highly integrated MOS-circuits seems favourable.
    Notes: Übersicht Das Verhalten von MOS-Feldeffekt-Transistoren mit Kanallängen im Submikrometer-Bereich wird anhand verschiedener Kurzkanaleffekte beschreibender Modelle untersucht. Neben den „klassischen” Begrenzungen der Kanallänge, gegeben durch Durchgriff, Durchbruch und heißen Elektronen, wird eine weitere Grenze aufgezeigt, die von der Empfindlichkeit der betrachteten Schaltung bezüglich Änderungen der Schwellspannung bestimmt wird. Die Schwellspannung ist stark von der Kanallänge abhängig. MOS-Transistoren mit Flächen von etwa 0,06 μm2 bei Betriebsspannungen von 1 V scheinen möglich und erlauben Speicherzellen von minimal 0,1 μm2 (dynamisch) bzw. 1,1 μm2 bei statischem Betrieb mit 6 Transistoren. Auf Grund wesentlich besserer Transistoreigenschaften erscheint der Betrieb solcher hochintegrierten MOS-Schaltungen bei tiefen Temperaturen günstig.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574226
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  • 19
    Electronic Resource
    Electronic Resource
    Numerische Magnetfeldberechnung durch Diskretisierungsverfahren (1986)
    Springer
    Electrical engineering 69 (1986), S. 307-320 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents To calculate magnetic fields with arbitrary material distributions and excitations the given vector potential differential equation is transformed into an algebraic system of equations (Finite Element Method). The application of the ampere turns rule leads (considerably more simply) to identical equations. Allowance for non-linearities is provided by the Newton-Raphson method. The transformation matrices are given for anisotropic material properties. Finally, a solver for sparsely populated matrices is deseribed.
    Notes: Übersicht Zur Berechnung von Magnetfeldern mit beliebigen Materialverteilungen und beliebigen Anregungen wird die Differentialgleichung für das Vektorpotential angegeben und mit Hilfe der finiten Elemente Methode in ein algebraisches Gleichungssystem umgewandelt. Die Anwendung des Durchflutungsgesetzes führt wesentlich einfacher zu identischen Bestimmungsgleichungen. Eine Berücksichtigung der Nichtlinearitäten geschieht mit dem Newton Raphson Verfahren. Für den Sonderfall von anisotropen Stoffeigenschaften werden die Transformationsmatrizen angegeben. Zum Schluß wird ein Lösungsverfahren für schwach besetzte Gleichungssysteme beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574746
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  • 20
    Electronic Resource
    Electronic Resource
    Elektrodynamisches Tragsystem mit endlich breiter schiene (1975)
    Springer
    Electrical engineering 57 (1975), S. 223-233 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents A suitable model for a general inductive levitation system is presented and then treated by means of the vector potential. The solutions are described by two-dimensional Fourier series and include treatment of a finite secondary width and an arbitrary cross section. The exitation system consists of superconducting coils which are arranged in normal flux, and null flux configuration, respectively. From the magnetic field, the force components for levitation, guidance and drag are determined.
    Notes: Übersicht Nach der Beschreibung der Voraussetzungen und des Rechenmodells werden die Differentialgleichungen des Vektorpotentials mit Hilfe von Reihenansätzen gelöst. Die endliche Schienenbreite, ja sogar Schienenquerschnitte beliebiger Form können durch eine Reihendarstellung der elektrischen Leitfähigkeit in den Ansatz einbezogen werden. Die Stromverdrängungserscheinungen werden bei endlicher Leiterdicke in zwei Ebenen als voneinander unabhängig betrachtet. Das Erregersystem ist als Spulengruppe in supraleitender Ausführung und in Normal-oder Nullflußanordnung vorgesehen. Aus den drei Komponenten des magnetischen Flusses lassen sich Trag-, Seiten-und Bremskräfte berechnen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476703
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