Library

X
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
  • 2000-2004  (8)
  • 2001  (5)
  • 2000  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Magnetoresistance of manganite thin films induced by reaction with substrate (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6320-6323 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Enhanced low-field magnetoresistance (MR) of polycrystalline lanthanum strontium manganite thin films is demonstrated using an approach in which effective barriers are formed by the heat-treatment induced reaction with an insulating substrate. The heat treatment induces two chemically different processes in the film, i.e., grain growth and chemically reactive penetration. In the former process, the MR decreases due to reduction of the number of grain boundaries, while in the latter the penetration of an insulating substrate and reacted materials forms effective barriers for the electron tunneling between ferromagnetic grains. The formation of effective barriers causes a factor of 3 larger MR than as-prepared films. These results suggest that the MR can be prospectively controlled in this fashion. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1370369
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Magnetotransport and Mössbauer study of Fe3O4/γFe2O3 granular thin films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7693-7695 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetotransport nature of Fe3O4/γFe2O3 granular thin films is examined in the transformation process from Fe3O4 to γFe2O3. The electrical and magnetoresistive features systematically change around the percolation threshold of ferrimagnetic Fe3O4 metal. The electrical conduction can be described on the basis of small-polaron hopping and variable range hopping with coulomb gap in the Fe3O4/γFe2O3 thin films. Possible causes for the change in the magnetoresistance are also addressed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358351
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Magnetic and magneto-transport properties of γFe2O3-grain-embedded Fe3O4 thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5585-5587 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and magneto-transport properties of γFe2O3-grain-embedded Fe3O4 thin films are investigated. The magnetoresistance (MR) abruptly changes in the intermediate oxidation state between Fe3O4 and γFe2O3. The magnetic relaxation coefficient also becomes a minimum around this oxidation state. The slow dynamics of the magnetic relaxation are associated with the disturbance of the domain wall displacement due to the embedded γFe2O3 grains with Fe2+ impurities. A possible mechanism for the change in the MR is also proposed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372458
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Giant isotropic magnetostriction of itinerant-electron metamagnetic La(Fe0.88Si0.12)13Hy compounds (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 653-655 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: La(FexSi1−x)13 compounds exhibit an itinerant-electron metamagnetic (IEM) transition above Curie temperature TC. The IEM transition in the compound with x=0.88 is accompanied by a giant volume change. From a practical viewpoint, TC was controlled by hydrogen absorption in order to obtain such a giant volume magnetostriction at room temperature. For the La(Fe0.88Si0.12)13H1.0 compound, the IEM transition occurs above TC=278 K, and a significant isotropic linear magnetostriction of about 0.3% at 7 T is induced in the vicinity of room temperature. This large magnetostriction is attributed to the giant volume magnetostriction of about 1% by the IEM transition. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388157
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Composition dependence of the energy gap of Zn1−x−yMgxBeySe quaternary alloys nearly lattice matched to GaAs (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 4168-4170 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The composition dependence of the energy gap (Eg) of Zn1−x−yMgxBeySe quaternary alloys grown by molecular-beam epitaxy was investigated. The energy gap of Zn1−x−yMgxBeySe can be controlled in a range of 2.7 eV〈Eg〈3 eV under nearly lattice-matching conditions to GaAs(001). The phenomenological formula for the energy gap of ZnMgBeSe quarterly is obtained using the bowing parameters theoretically or experimentally estimated for the ternary compounds. These results show that nonlinear behavior was observed on the composition dependence of the energy gap as the Be and Mg compositions increased. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1424064
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The effects of a high-carbohydrate diet on the stress-strain behavior of the periodontal ligament of the distal root of the mandibular first molar in hamsters (2001)
    Copenhagen : Munksgaard International Publishers
    Journal of periodontal research 36 (2001), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We analyzed stress-strain curves in transverse sections at three different root levels of the cervical, middle, and apical regions of the distal root of the mandibular first molar in hamsters fed a high-carbohydrate (experimental group) or standard (control group) diet for 8 weeks. Each section was loaded in vitro at a rate of 5 mm/min in an extrusive direction. The rupture sites and the structures of birefringent collagen fibers in the periodontal ligament were also analyzed. The maximum shear stress, tangent modulus, and failure strain energy density of the periodontal ligament were significantly greater in the cervical region than in the middle and apical regions in both the control and experimental groups. The maximum shear stress, tangent modulus, and failure strain energy density of the periodontal ligament in the experimental group were significantly lower than those in the control group at the ervical and middle regions. The maximum shear strain was significantly greater in the experimental group than in the control group at the middle and apical regions. Histological sections showed that the periodontal ligament ruptured irregularly in both groups. The collagenous fibers of the ligament in the experimental group appeared to be thinner and less birefringent at the cervical and middle regions of the root. These results suggest that a high-carbohydrate diet differentially affects the collagen fibers in the periodontal ligament as a function of the root level, and that these effects are evident in changes in the mechanical properties of the ligament.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0765.2001.360505.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of clarithromycin in Helicobacter pylori eradication therapy in patients with liver cirrhosis (2000)
    Oxford, UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 14 (2000), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background: Proton pump inhibitor triple therapy with clarithromycin and metronidazole has been widely used for Helicobacter pylori eradication. However, the efficacy and the safety of this therapy in patients with liver cirrhosis have not been established. Aim: To evaluate the effect of hepatic dysfunction on metabolism of clarithromycin as it is used for H. pylori eradication therapy in patients with liver cirrhosis, and the efficacy of eradication therapy in those patients. Methods: Serum levels of clarithromycin and its meta-bolite, 14-(R)-hydroxyclarithromycin, were examined in 18 subjects (five normal controls and 13 hospitalized patients with liver cirrhosis) on a selected day between days 7 and 10 of a 2-week course of eradication therapy. This therapy consisted of lansoprazole (30 mg, once a day) together with clarithromycin (200 mg, twice a day) and metronidazole (250 mg, twice a day). In addition, 118 H. pylori-positive out-patients, 88 with peptic ulcer and 30 with liver cirrhosis, underwent the same eradication therapy. Results: Values for the area under the 0–6 h concentration–time curve (AUC) for clarithromycin were not significantly different among the groups. However, the AUC (0–6 h) values of 14-(R)-hydroxyclarithromycin were significantly lower in the Child-Pugh C group than in either the normal controls or the Child-Pugh A/B group. The cure rate for the peptic ulcer patients was 84% on a per protocol analysis (95% CI: 80%−88%) and 81% on an intention-to-treat analysis (95% CI: 77%−85%), while in the liver cirrhosis patients it was 89% in a per protocol analysis (95% CI: 78%−99%) and 83% in an intention-to-treat analysis (95% CI: 70%−97%). Mild adverse effects were observed in 10% of the peptic ulcer patients and 13% of the liver cirrhosis patients, with none leading to premature withdrawal from the study. Conclusion: The 2-week low-dose lansoprazole-based triple therapy tested is a simple, effective and well-tolerated regimen for H. pylori eradication in patients with liver cirrhosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2000.014s1216.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Effects of acrylic acid incorporation on the pressure–temperature behavior and the calorimetric properties of poly(N-isopropylacrylamide) in aqueous solutions (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 80-83 
    Details
    ISSN: 1435-1536
    Keywords: Key words Poly(N-isopropylacrylamide) ; Poly(acrylic acid) ; Cloud point ; Thermoresponsive polymer ; High pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  We studied the effects of pH on the pressure–temperature dependence of coil–collapse transition for aqueous solutions of copolymers of N-isopropylacrylamide and acrylic acid (Ac). At low pressures, the transition temperature (T tr) increased with pressure, but T tr decrease with increasing pressure at pressures higher than 50–100 MPa. By increasing the pH, the transition contour shifted to a higher temperature. When the Ac content was increased, the effects of pH became more evident. From a calorimetric study at atmospheric pressure, ΔH tr was found to become smaller by increasing the portion of the ionized residues in the copolymer. The ratio to the van't Hoff enthalpy changes became larger with an increase in pH, which indicated that the production of charge decreased the cooperative domain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003969900231
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...