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
  • 1
    Electronic Resource
    Electronic Resource
    Predictable normocapnoea in controlled ventilation of infants with Jackson Rees or Bain system (1998)
    Oxford : Blackwell Science Ltd
    Anaesthesia 53 (1998), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have devised a formula for ventilator settings which would provide normal minute ventilation without rebreathing during controlled ventilation using a Jackson Rees or Bain system. As VT = VS + VF − VL, where VT = delivered tidal volume, VS = set tidal volume, VF = the volume of fresh gas entering during the inspiratory phase and VL = the lost volume due to the compliance of the system, VS was derived: VS = VL + VT × [1 − b/(1 + a)] where a = expiratory-to-inspiratory ratio and b = the ratio of fresh gas flow to the minute ventilation. It was evaluated in 62 infants. Arterial partial pressure of carbon dioxide (mean (SD)) was 4.6 (0.5) kPa (35 (4) mmHg) with a range of 3.42–5.78 kPa (26–44 mmHg). The 90th percentile was 5.1 kPa (39 mmHg). It is concluded that predictable normocapnoea can be conveniently achieved in infants in controlled ventilation with Jackson Rees or Bain system if our formula is applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2044.1998.00637.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effect of triethylamine in the mobile phase on the retention properties of conventional polymeric and horizontally polymerized octadecylsilica in RPLC (1999)
    Springer
    Chromatographia 49 (1999), S. 635-642 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Interaction of mobile and stationary phases ; Linear solvation energy relationships ; Triethylamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effect of triethylamine (TEA) in the mobile phase on the RPLC retention behavior of small organic solutes has been studied on a conventional polymeric octadecylsilica (ODS) and on a horizontally polymerized ODS. Retention factors for a set of solutes were measured on the two phases with methanol-water mobile phases containing triethylamine at different concentrations and analyzed by use of linear solvation energy relationships (LSER). Variation of the resulting LSER coefficients—v (hydrophobicity),r (polarizability),s (dipolarity),b (hydrogen-bond (HB) donating acidity), anda (HB accepting strength)—were examined to see how TEA affects the intermolecular interaction properties of the mobile and stationary phases and hence the retention of the solutes. Addition of TEA to the mobile phase changes the interaction properties of both conventionally polymerized and horizontally polymerized ODS; the effect is greater for the conventional phase. The HB donating acidity (b) of conventional polymeric ODS is significantly reduced by addition of TEA. For the mobile phases studied the magnitudes of theb andv coefficients for the horizontally polymerized ODS phase are greater than for the conventional phase. The different interaction properties of the two polymeric phases arise mainly as a result of differential adsorption of TEA, because of the very different amounts of surface silanol groups present on the two phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466905
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Structural evolution of W nano clusters with increasing cluster size (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 7402-7404 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have recorded the x-ray diffraction (XRD) patterns of nanometer-size W metal clusters prepared at different average cluster sizes. Nanometer-size W metal clusters were produced through a collision induced clustering mechanism of W metal atoms generated by decomposing W(CO)6 vapors. The XRD patterns clearly showed that structure changed from amorphous→face- centered-cubic (fcc)→body-centered-cubic (bcc) with increasing average cluster size. This implies that W metal clusters do not simply approach the bulk bcc structure but pass through an intermediate fcc structure before they reach the bulk structure, as predicted by Tománek, Mukherjee, and Bennemann [Phys. Rev. B 28, 665 (1983)]. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480063
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Magnetic and microstructural properties of CoCrTa/Cr/Al thin films (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5357-5357 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CoCrTa/Cr/Al and CoCrTa/Cr thin films were deposited on glass substrate at 280 °C using dc magnetron sputtering. The coercivity of CoCrTa/Cr films increased by introducing an Al underlayer. In 500 A(ring) CoCrTa/Cr films, the coercivity increased with increasing Cr thickness and saturated above 700 A(ring) Cr thickness (Hc=1050 Oe). On the other hand, in 500 A(ring) CoCrTa/Cr/700 A(ring) Al films, the coercivity increased sharply with increasing Cr thickness and showed a maximum value at 700 A(ring) Cr thickness (Hc=1380 Oe). The coercivity squareness of the CoCrTa/Cr/Al and CoCrTa/Cr films was increased with increasing Cr thickness. The coercivity squareness of CoCrTa/Cr/Al films was lower than that of CoCrTa/Cr films. To study the origin of coercivity enhancement in CoCrTa/Cr films when deposited on an Al underlayer, microstructures of the two films were investigated using transmission electron microscopy (TEM). We controlled grain sizes of CoCrTa films by changing the thickness of the Cr layer. The grain size of CoCrTa films increased with increasing Cr thickness. The coercivity of CoCrTa/Cr/Al films showed a maximum value at a grain size of 430 A(ring). These results suggest that the transition from single domain to multidomain could occur at a grain size of ∼400 A(ring). To understand the coercivity squareness changes by the introduction of an Al underlayer, the angular variation of coercivity was measured. The magnetization of CoCrTa/Cr films was reversed by domain wall motion.On the other hand, by the incorporation of an Al underlayer, the angular variation of coercivity deviated from the domain wall motion mode. Cross-sectional TEM studies of CoCrTa/Cr/Al films showed that Cr atoms in Cr layers diffused into an Al underlayer and Al atoms were detected in both Cr and CoCrTa layers, but magnetization of the magnetic layer was not decreased. The decrease in coercivity squareness of CoCrTa/Cr/Al films would be attributed to magnetic decoupling by segregation of Al atoms in grain boundaries of CoCrTa films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361324
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Electron spectroscopic studies of colossal magnetoresistance material La1−xCaxMnO3 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4558-4560 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High resolution photoemission measurements have been performed for the ferromagnetic transition of La0.67Ca0.33MnO3 and for the order–disorder transition of La0.4Ca0.6MnO3. The band gap collapsed below the Curie temperature and the density of states at the Fermi level increases with cooling. Upon cooling through the order–disorder transition temperatures, TCO, the band gap increases by ∼50 meV. This change in the gap is consistent with the change in the activation energy above and below TCO estimated from conductivity data. We have also performed soft x-ray magnetic circular dichroism measurements at Mn L2,3 edges for ferromagnetic La0.67Ca0.33MnO3 and La0.8Ca0.2MnO3. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361724
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Giant magnetic effects in the L-edge extended x-ray absorption fine structure of 3d transition metals : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6493-6495 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic extended x-ray absorption fine structure (EXAFS) study at the L edges of ferromagnetic Fe, Co, and Ni thin films has been conducted using circular polarized soft x rays. A very large helicity dependence has been observed in the L-edge EXAFS spectra. Surprisingly, in contradiction with prior works, these magnetic EXAFS results indicate a nonlinear dependence of this effect on the magnetic polarization of the scattering atom. The data further indicate that the dominant scattering paths responsible for the effect are different from those responsible for EXAFS. A discussion of the results in relation to the present understanding of the underlying mechanism and its ramifications to the existing theoretical frameworks is also presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361980
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Photoresponse of a YBa2Cu3Ox grain-boundary junction (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3770-3773 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoresponse of a YBa2Cu3Ox grain-boundary junction has been measured as a function of chopping frequency and bias current in a temperature range of 2 K≤T≤70 K. The response was found to be mostly bolometric, but a nonbolometriclike component was also identified, which appeared as a chopping-frequency independent signal while immersing the sample in the superfluid helium. The bias-current dependence of the response showed a peak at a current corresponding to the critical current of the junction, and the peak values remained constant for 30 K≤T≤70 K. However, below 15 K the peak of the photoresponse increased very sharply with decreasing temperature following a 1/T3 dependence, consistent with the temperature dependence of the thermal boundary resistance between the film and the substrate. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361380
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Interface properties of thin oxides grown on strained GexSi1−x layer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 982-986 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical and chemical properties of the interfaces of thin oxides grown on strained GexSi1−x layers are analyzed in detail using capacitance-voltage measurements and Auger electron spectroscopy. It is found that the electrical properties (interface states and fixed oxide charges) of the interface depend on various parameters such as oxidation temperature, oxidation time, Ge distribution near the interface, and Ge distribution in the entire epilayer. The Ge distribution at the interface can be described using concentration-dependent diffusivity of Ge in the epilayer. The electrical properties are improved with the increase in oxidation temperature, but for a given oxidation temperature, the quality of the interface degrades with the increase in oxidation time. At a very high oxidation temperature the Ge distribution in the entire epilayer is altered due to the high diffusivity of Ge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357776
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Structural and magnetic studies of heteromagnetic multilayers by reflectivity of circularly polarized soft x rays (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6492-6492 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The reflectivity of circularly polarized (CP) soft x rays is a technique which combines the power of x-ray scattering and magnetic circular dichroism and allows the structural and magnetic characterization of heteromagnetic multilayers. In this technique, the energy and angular dependence of the differential reflectivity of left- and right-circularly polarized soft x rays at the relevant absorption edges of the constituent elements of the multilayers are measured. As examples the reflectivity curves for single films of Fe, Co, ordered and disordered Fe50Co50 alloys, and for a trilayer consisting of two single crystal Fe30Co70 films separated by an 8.7 A(ring) Mn spacer layer media utilizing complex dielectric tensors with no free parameters show that the rich reflectivity curves can be used to determine the multilayer magnetic ordering, film thicknesses, interface quality, as well as differentiating between ordered and disordered alloys. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362452
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Design and performance of very long-wavelength GaAs/AlxGa1−xAs quantum-well infrared photodetectors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6001-6008 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an extensive and detailed study of very long wavelength quantum well infrared photodetectors covering the spectral region between 14 and 20 μm. Measurements were made on seven different molecular beam epitaxy grown samples having different well widths and barrier heights. In this study we combine experimental results with theoretical analysis and focus on the relationship between the quantum well structure and detector performance, i.e., responsivity, dark current, dynamic resistance, noise current, optical-gain, and detectivity. These results provide the basis for further optimization, and the detector parameters needed for the design of the readout circuit for focal plane arrays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358351
    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...