Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1990-1994  (17)
  • 1970-1974  (4)
  • 1991  (17)
  • 1971  (4)
Material
Years
  • 1990-1994  (17)
  • 1970-1974  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4632-4640 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have determined by neutron reflectivity the volume fraction profile, φ(z) of poly(dimethylsiloxane) chains in toluene adsorbed at the free surface of the solution. φ(z) is found to vary as (a/z)4/3 conforming to scaling laws proposed by de Gennes. The extension of the profile is of the order of the radius of gyration. To arrive at these results, the use of two different isotopic compositions and the simultaneous analysis of results obtained with various polymer chain lengths and concentrations are necessary. The validity of several models has been tested. With a few realistic hypotheses compatible with already existing experimental data, it appears that only the self-similar profile is acceptable for the system studied.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7893-7900 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The NO γ emission is observed from the reaction of NO+(a)+NO. The emission provides a new detection method for studying the NO+(a) reaction kinetics at thermal energy without electric field. The NO+(a) is produced by photoionization of NO at 76.5 nm as well as by the reaction of Ar++NO, where Ar+ is also produced by photoionization of Ar. The vibrational population distributions of NO(A) resulted from the ion–molecule reactions are measured and used to discuss the mechanisms for the production of the emission. The reaction rate constants are determined from the decay rates of the emission intensity as a function of time. The reaction rate constants of NO+(a)+NO and Ar++NO at room temperature are measured to be (5.8±0.7)×10−10 and (2.1±1.0)×10−10 cm3/s, respectively. The reaction rate constant of NO+(a)+Ar at thermal energy is estimated to be about 10−12 cm3/s.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2177-2179 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report an extension of the bi-epitaxial Josephson junction process that permits the use of a variety of substrate materials and allows junctions to be placed at any level of a multilayer structure. The new materials, SrTiO3, MgO, and CeO2, serve as a base layer, a seed layer, and a buffer layer, respectively, and replace Al2O3, MgO, and SrTiO3 in the original bi-epitaxial process. This new process offers much more flexibility in designing a circuit. Bi-epitaxial junctions made with the new set of materials show much improved electrical properties, especially at 77 K. We attribute the improved electrical characteristics to a better thermal expansion match between the substrate and the thin-film layers. Important junction properties such as critical currents and junction resistances are compared to other types of grain boundary junctions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3051-3053 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first fabrication of a monolithic dc SQUID magnetometer that operates above 77 K. We have used bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7 (YBCO) to produce the SQUID itself while the flux transformer consists of heteroepitaxial layers of YBCO/SrTiO3/LaAlO3/SrTiO3/YBCO. In the circuit fabricated, the SQUID is built on top of the epitaxial layers of the flux transformer. We have used dry etching, ion-beam cleaning, and photolithographic processing to pattern all the layers. Via contacts and step coverage of the epitaxial wire layers have been achieved without significant degradation of the superconducting properties of any of the three YBCO layers. The magnetometer enhances the magnetic field sensitivity of the bare SQUID by a factor of 127, giving an effective area, dΦ/dB, of 1.9 mm2.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 7 (1991), S. 3076-3080 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 7 (1991), S. 1855-1860 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 2518-2522 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 5 (1991), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A 6.7kb DNA fragment containing the pigment genes of Erwinia herbicola Eho13 has been cloned into Escherichia coli. These genes were chromosomally encoded in E. herbicola. The entire DNA fragment could be divided into at least three regions. Deletions in Region I resulted in a non-pigmented phenotype, a deletion in Region II resulted in a pink/yellow phenotype, deletions in Region III resulted in either a pink or a non-pigmented phenotype. Tn 1000 insertions in the same regions, however, gave different phenotypes. Insertions in Region U produced a pink phenotype. Insertions in Region III resulted in either a light-yellow or a non-pigmented phenotype. Minicell studies showed that the 6.7kb DNA fragment encoded at least five proteins (50kDa, 42kDa, 36kDa, 35kDa and 34kDa). A 2.7kb Hin dIII deletion in Region I caused the disappearance of these proteins, suggesting that this 2.7 kb fragment may play a regulatory role in pigment synthesis. Our results also showed that a 4.1kb Eco RV fragment consisted of Region I and a part of Region II complemented a pink/yellow clone of Eho10 (pHL545), suggesting that the pigments of Eho13 and Eho10 were probably similar or identical.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    facet.materialart.
    Unknown
    Newberry, S.C. : Periodicals Archive Online (PAO)
    Studies in Short Fiction. 8:4 (1971:Fall) 561 
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neural transmission 32 (1971), S. 90-103 
    ISSN: 1435-1463
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In drei Experimenten wurden elektrolytische Läsionen im vorderen bzw. medialen, dorsalen und hinteren Gebiet des Hypothalamus der weiblichen abgesetzten Ratte plaziert, um den Locus zu bestimmen, dessen Zerstörung Hypertriglyceridämie und Hypercholesterinämie verursacht. In einem weiteren Experiment wurden Läsionen verschiedener Größe im ventromedialen Hypothalamus plaziert, um die Ausdehnung der verantwortlichen Nervenmasse zu definieren. Nur Läsionen, welche hauptsächlich den ventromedialen hypothalamischen Kern zerstören, verursachen bedeutende Erhöhungen von Triglyceriden und Cholesterinspiegeln. Kleine Läsionen, welche auf das mittlere Gebiet des ventromedialen Kernes beschränkt sind, verursachen die erwähnten Erscheinungen nicht. Mit größer werdendem Läsionsherd werden die Änderungen der Plasmalipide aber größer. Die Ergebnisse weisen darauf hin, daß die ventromedialen hypothalamischen Kerne und ihr unmittelbares Grenzgebiet den Fettstoffwechsel beeinflussen.
    Notes: Summary In three experiments exploratory lesions were placed in anterior, medial, dorsal and posterior hypothalamic areas of weanling female rats to determine the localization and the extent of the area affecting plasma triglyceride and cholesterol levels. In another experiment, lesions of various sizes were placed in the ventromedial hypothalamic area to define the size of the lesions necessary to elevate plasma triglyceride and cholesterol levels. Three or more weeks after the hypothalamic operation, trunk blood was obtained after decapitation. Only lesions destroying primarily the ventromedial hypothalamic nuclei resulted in significant elevations of both lipid fractions. Small lesions, confined to the medial area of the VMN in antero-posterior respect did not produce the above alterations, but with increasing lesion size significant positive correlations between lesion size and plasma lipid levels were evident. The data suggest that the ventromedial hypothalamic nuclei are a hypothalamic site which influences lipid metabolism.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...