ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
  • Springer  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Frequency analysis of time-varying elastance model of the left ventricle (1980)
    Springer
    Bulletin of mathematical biology 42 (1980), S. 173-180 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Zadeh's transfer function method for linear time-variable systems is used to apply frequency-domain analysis to a periodically time-varying elastance model of the left ventricle. Left ventricular pressure computed from the system function of the time-varying elastance and the phasors of aortic flow shows a typical waveform of the measured ventricular pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464636
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Performance criteria for optimization of cardiac assistance (1979)
    Springer
    Bulletin of mathematical biology 41 (1979), S. 217-227 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A performance criterion and weighting factors for the optimal cardiac assistance are investigated by applying Tellegen's network theorem and tolerance analysis on animal experimental data for left ventricular (LV) bypass on the failing heart. Two major factors with respect to cardiac assistance (total power delivered to the peripheral circulatory system, and changes in temporal pattern of ventricular contraction) are represented by two performance criteria,J 1 andJ 2 whereJ 1 relates to the sum of LV and pump power, andJ 2 relates to the “peakedness” factor of LV power. The total performance index (J) is determined as the weighted sum ofJ 1 andJ 2;J=w 1J1+w2J2. The weighting factors,w 1 andw 2, are computed as inverses of the tolerance in the performance contours with respect to improvement of stroke work per minute from pre- to post-bypass condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Study of siloxane-modified epoxy resin using thermally stimulated current (1995)
    Springer
    Polymer bulletin 35 (1995), S. 641-648 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The low temperature relaxation of epoxy resin modified with siloxane oligomers was investigated by using thermally stimulated current (TSC) and relaxation map analysis (RMA). The β-relaxation of epoxy resin and the glass transition temperature of siloxane oligomer were folded and shifted to higher temperature as the concentration of trifluoropropyl (TFP) in siloxane oligomer increased. In the systems containing over 50% of TFP a new relaxation peak due to the dipole orientation was observed at around-45°C. As the concentration of TFP increased the compensation temperature (Tc) and the degree-of-disorder (DOD) were increased while the compensation time, τc was decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324120
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Frequency-Domain analysis of oxygen stores during hypoxia in the goat (1978)
    Springer
    Annals of biomedical engineering 6 (1978), S. 352-366 
    Details
    ISSN: 1573-9686
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Sinusoidal variations of expired oxygen fraction (FEO2) and arterial blood oxygen saturation (S aO2) were measured in three paralyzed and anesthetized goats after producing sinusoidal changes in inspired oxygen fraction (FIO2) under controlled ventilation. These frequency-domain data were used to evaluate the quantitative dynamic relations among FIO2, FEO2, oxygen uptake at the lung $$\dot VO_2 $$ and S aO2 using the material balance equation at the lung and the Fourier transform of this equation. The overall transfer function between FIO2 and FEO2 was T(s)=0.07/(s+0.075) with a time constant of 13.3 sec, and $$\dot VO_2 $$ and S aO2(s) were related by a transfer function, G 1(s)=0.03/(s+0.008), with a time constant of 125 sec. The magnitude of the fundamental component of S aO2(s), |S aO2(jw)|, was related to |FEO2(jw)| by a constant, K=0.607, as S aO2 remained near the linear portion of the O2-hemoglobin dissociation curve in moderate hypoxia. Based upon the present frequency-domain analysis, the slow time response of S aO2 to the transient change of O2 concentration of the atmosphere is related to the homeostatic mechanism of the change of oxygen stores in the blood due to circulatory responses. The fast time response in FEO2 to the change of FIO2 is produced by the tachometer feedback function of the oxygen stored in the functional residual capacity of the lung. The present analysis and experimental observation provide a new method of investigating oxygen uptake using frequency-domain analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000002
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A study of water absorption characteristics of DGEBA/DDS resin system using near infra-red spectroscopy (1994)
    Springer
    Polymer bulletin 33 (1994), S. 465-470 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Water absorption and desorption of the diglycidyl ether of bisphenol A (DGEBA)/4,4′-diaminodiphenyl sulfone (DDS) resin systems, cured isothermally at three different temperatures (160, 180 and 220°C), were monitored at 80°C, as a function of soaking and drying times. New near infra-red spectroscopic (NIR) technique as well as the conventional gravimetric method were used. The data from two different techniques were reasonably identical showing that the new NIR technique is valid. The resin systems cured at higher temperature absorbed more water. The degree of structural packing of the network systems has been estimated from the observations in water absorption characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293492
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Analysis of visual evoked potentials using the time locus of potential distribution centre (1986)
    Springer
    Medical & biological engineering & computing 24 (1986), S. 169-173 
    Details
    ISSN: 1741-0444
    Keywords: Correlation ; Visual evoked potential ; Visual pathway ; Weighting matrix
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Visual evoked potentials (VEPs) were measured using 19 electrodes attached to the scalps of five normal human subjects during stimulations of the full-field and hemifield chequerboard pattern reversal. These signals were analysed by a new method based on the time locus of the potential distribution centre, where this locus was computed from the spatial potential distribution using the weighting matrix and maximum mean cross-correlation criteria. The results showed that the loci of normal subjects are similar, with an average correlation of 0·87. The loci produced in the left hemifield stimulation were different from the loci produced during the right hemifield stimulation, with a correlation of −0·66. Experimental results from four cats showed significant changes of the time loci after surgical division of the visual path-ways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443931
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    facet.materialart.
    Unknown
    A study of water absorption characteristics of DGEBA/DDS resin system using near infra-red spectroscopy (1994)
    Springer
    Details
    Publication Date: 1994-09-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Study of siloxane-modified epoxy resin using thermally stimulated current (1995)
    Springer
    Details
    Publication Date: 1995-11-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...