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  • 1
    Electronic Resource
    Electronic Resource
    Impact of some process variations on NiFe thin films (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4195-4197 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rutherford backscattering spectrometry (RBS) and Auger electron spectroscopy (AES) are used to detect changes in stoichiometry and impurity incorporation in thin, rf diode sputtered NiFe films as a function of processing variations. Comparisons are made to thin, evaporated NiFe films with respect to oxygen reactivity. Because Ni and Fe are close in atomic weight, RBS, using 2-MeV He incident ions, cannot resolve them. However, by increasing the He incident energy to 4.7 MeV, the (26)Fe(56) and (28)Ni(58) isotopes are resolvable in films thinner than about 250 A(ring) and the actual NiFe thin-film stoichiometry can be calculated. Complementary AES depth profiling measurements indicate Fe enrichment by approximately 5 wt. % as the deposition substrate bias is increased from 0 to −200 V. Magnetic characterization shows a corresponding increase in easy-axis coercivity of more than a factor of 10. Other magnetic parameters are also adversely affected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334609
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  • 2
    Electronic Resource
    Electronic Resource
    Coercivity, structure, and stoichiometry of Permalloy/alumina multilayers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4192-4194 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of permalloy/alumina multilayers were examined to determine their structure, composition, and magnetic performance. The conditions of permalloy and alumina-layer thickness, and substrate bias necessary to minimize the coercivity have been shown. Multilayer structures with alumina-layer thicknesses of less than 100 A(ring) and permalloy-layer thicknesses between 400 and 500 A(ring) had the lowest coercivities. Structures were examined by RBS, TEM, AES, and XRD to study the effect of bias sputtering on the structure and composition of the multilayers. It was found that sputtering multilayers at high biases did not affect the coercivity, but did cause significant physical and chemical changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334608
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  • 3
    Electronic Resource
    Electronic Resource
    Powder puff spiroplasma: A new epiphytic mycoplasma (1982)
    Springer
    Microbial ecology 8 (1982), S. 169-180 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A spiroplasma (strain PPS1) isolated from healthy flowers ofCalliandra haematocephala in Florida has been found to be a member of a serogroup of the Spiroplasmataceae. It is distinct fromSpiroplasma citri and from other described spiroplasmas as determined by growth inhibition, fluorescent antibody, and ELISA serological tests. PPS1 was also distinguished fromS. citri and several other spiroplasmas by the guanine + cytosine content of its DNA. PPS1 requires sterol for growth, is inhibited by digitonin, grows at 20–30°C, and does not hydrolyze arginine or urea. The ready isolation of this and similar organisms from surfaces of healthy plants emphasizes that caution should be exercised in attempts to isolate cell wall-less prokaryotes from the interior of diseased plants. Although some strains of spiroplasmas are known as insect pathogens in nature, the ecological role(s) of the flower-inhabiting spiroplasmas has yet to be fully determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010450
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogen bonding: A molecular orbital treatment by the EHT and the CNDO/2 methods of methanol and of formic acid (1969)
    Springer
    Theoretical chemistry accounts 13 (1969), S. 81-90 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract By both the EHT and the CNDO/2 calculations, the linear dimer of methanol is found to be more stable than the cyclic dimer. The hydrogen bonds in the trimer are stronger than those in linear dimers. The proton potential function, charge densities, and overlap populations in the linear dimer of methanol have been obtained. The CNDO/2 calculations show that the cis-form of formic acid is more stable than the trans-form, in agreement with experimental data. The cyclic dimer of formic acid is more stable than the open dimer. The β-form of formic acid trimer is more stable than the α-form. The proton potential function and the charge densities in the cyclic dimer of formic acid have been obtained. The CNDO/2 method gives more realistic proton potential functions for the dimers of methanol and formic acid. The O ... O stretching force constant in the dimers of methanol and formic acid have been estimated to be 0.13 × 105 dynes/cm and 0.27 × 105 dynes/cm, respectively, in agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527322
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  • 5
    Electronic Resource
    Electronic Resource
    Fermi resonance in the carbonyl band of cyclopentanone (1972)
    Springer
    Theoretical chemistry accounts 25 (1972), S. 89-96 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die relativen Frequenzverschiebungen der Carbonylstreckschwingung im Infrarotspektrum des Cyclopentanons (CP) und O18-CP werden in verschiedenen Lösungsmitteln gemessen. Beim Auftragen dieser Werte gegen die des Acetophenons zeigt sich, daß das Dublett im Bereich der Carbonylstreckschwingung des CP durch Fermiresonanz hervorgerufen wird und bei O18-CP keine Aufspaltung stattfindet. In der Dampfphase wurde weder bei CP noch bei O18-CP ein Dublett beobachtet. Aufgrund dieser Ergebnisse wird ein Schwingungsenergiediagramm von CP und O18-CP vorgeschlagen und die Energiedifferenz zwischen den ungestörten Resonanzzuständen (δ 0) und den Wechselwirkungstermen (H ij) erhalten. Diese Werte stimmen mit den aus Intensitätsmessungen erhaltenen gut überein.
    Notes: Abstract The relative carbonyl stretching frequency shifts in the infrared spectra of cyclopentanone (CP) and O18-CP have been measured in various solvents. The plot of these shifts versus those of acetophenone shows that the doublet in the carbonyl stretching region of CP is caused by Fermi resonance and the splitting does not take place in O18-CP. In the vapor phase no doublet was observed in CP or O18-CP. Using these results, the vibrational energy diagrams of CP and O18-CP are proposed and the energy difference between the unperturbed resonating levels (δ 0) and interaction terms (H ij) were obtained. These values agree well with those obtained from the intensity data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00528262
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  • 6
    Electronic Resource
    Electronic Resource
    The carbonyl frequency of cyclopentanone as a function of its distortion, a vibrational model for 2- and 7-norbornanone (1971)
    Springer
    Theoretical chemistry accounts 20 (1971), S. 364-370 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe der Normalkoordinaten-Analyse wird das Infrarotspektrum des Zyklopentanons berechnet, wobei die Geometrie von der planaren Form bis zu der Form, bei der die Geometrie am Fünfring derjenigen des 2-Norbornanons oder auch des 7-Norbornanons ähnlich wird, variiert wird. Der berechnete Wert von v co des Zyklopentanons ist 1739,9 cm−1, während der experimentelle Wert 1740 cm−1 beträgt. Bei den angegebenen Deformationen des Zyklopentanonrings wird der berechnete Wert von v co zu niedrig, wenn man die Kraftfelder zugrunde legt, die für das Zyklopentanon gute Übereinstimmung mit dem Experiment liefern. Die Carbonylkraftkonstanten mußten von 9,7 auf 10,0 m dyn/Å für das 2-Norbornanon-Modell sowie auf 10,4 m dyn/Å für das 7-Norbornanon erhöht werden, um den Wert von v co in Übereinstimmung mit dem Experiment zu bringen.
    Abstract: Résumé Le spectre infra-rouge de la cyclopentanone a été calculé en employant l'analyse en coordonnées normales lorsque l'on modifie la géométrie depuis la forme plane jusqu'aux formes o u les configurations sur le noyau pentagonal ressemblent à celles de la 2-norbornanone et de la 7-norbornanone. La fréquence ν co calculée pour la cyclopentanone est 1739.8 cm−1 comparée à la valeur expérimentale de 1740 cm−1. Lorsque l'on déforme le cycle de la cyclopentanone comme indiqué ci-dessus, la valeur calculée de ν co est trop faible si l'on emploie les champs de force qui donnent un bon accord avec la valeur expérimentale pour la cyclopentanone. La constante de force du carbonyle doit etre augmentée de 9,7 à 10,0 mdynes/Å pour le modèle analogue à la 2-norbornanone et de 9,7 à 10,4 mdynes/Å pour le modèle analogue à la 7-norbornanone.
    Notes: Abstract Using normal coordinate analysis, the infrared spectrum of cyclopentanone has been computed as the geometry is modified from the planar form to those in which the geometry about the 5-membered ring looks like 2-norbornanone and also like 7-norbornanone. The computed v co of cyclopentanone is 1739.9 cm−1 compared to the experimental value of 1740 cm−1. As the cyclopentanone ring is deformed to resemble either the 2-norbornanone or the 7-norbornanone ring system, the computed v co is too low using the force fields that give good agreement with experimental value for cyclopentanone. The carbonyl force constant had to be increased from 9.7 to 10.0 mdynes/Å for the 2-norbornanone-like model and to 10.4 mdynes/Å for the 7-model system to give v co values in agreement with the experimental values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527191
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  • 7
    Electronic Resource
    Electronic Resource
    Climatological variations in the Northern Hemisphere circumpolar vortex in January (1992)
    Springer
    Theoretical and applied climatology 46 (1992), S. 63-73 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Recent secular variations in the January circumpolar vortex over the Northern Hemisphere are examined by digitizing the latitude at which the 546 dam isoheight at 50 kPa crosses every 10° meridian from 1947–90. A statistically significant expansion of the vortex is detected from 1966–90. Most of the expansion occurred over the North Pacific Ocean in the vicinity of the Aleutian Low and a less dramatic but significant expansion also occurred over eastern Canada and northern New England. The only region where the vortex contracted significantly is over the western United States. The trough in the western Pacific expanded eastward across the International Date Line in the past quarter century and, in conjunction with the observed contraction over the western United States, indicates amplification of 50 kPa standing waves in the Western Hemisphere. This change in circulation regimes could account for the increased frequency of warm air masses and the decreased occurrence of the coldest wintertime air masses in Alaska.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00866086
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  • 8
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    Powder puff spiroplasma: A new epiphytic mycoplasma (1982)
    Springer
    Details
    Publication Date: 1982-10-01
    Print ISSN: 0095-3628
    Electronic ISSN: 1432-184X
    Topics: Biology
    Published by Springer
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  • 9
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    IV. Production of cesium salts (1966)
    Springer
    Details
    Publication Date: 1966-11-01
    Print ISSN: 1047-4838
    Electronic ISSN: 1543-1851
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
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    Climatological variations in the Northern Hemisphere circumpolar vortex in January (1992)
    Springer
    Details
    Publication Date: 1992-01-01
    Print ISSN: 0177-798X
    Electronic ISSN: 1434-4483
    Topics: Geosciences , Physics
    Published by Springer
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