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
  • Articles  (139)
  • Other Sources
  • Articles: DFG German National Licenses  (139)
  • Springer  (139)
Collection
  • Articles  (139)
  • Other Sources
Source
Keywords
Publisher
Years
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Biophysics of the photoablation process (1991)
    Springer
    Lasers in medical science 6 (1991), S. 241-254 
    Details
    ISSN: 1435-604X
    Keywords: Laser angioplasty ; Photoablation ; Photohydraulic effect ; Fast thermal explosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics , Technology
    Notes: Abstract Besides the coagulation, where the body digests the necrotic tissue and direct evaporation of tissue, the photoablation effect turns out to be very important in tissue removal. In the case of high tissue absorption the process channels in photoablation can either be photochemical (bond breaking) or fast thermal. In the case of transparent media, a plasma formation due to high irradiances and an optical breakdown is necessary for ablation or photodisruption. All the process channels lead to a fast microscale explosion and to Shockwaves. For soft tissue the main process channel is the fast thermal explosion. Assuming that tissue will be disintegrated, if the energy deposited within a single laser pulse is larger than a material specific threshold, the thresholds for the radiant exposure and ablation rates respectively can be calculated. There is a large difference, whether the laser radiation is applied to the tissue surface in noncontact or through a fibre in contact. In contact the ‘fast thermal explosion’ happens in a closed chamber and hence the photohydraulic effect will support the photoablation. The thermally damaged zone in the surrounding tissue depends on the optical penetration depth mainly in cases that the pulse duration is shorter than a critical time given by the heat conductivity. Pulsed lasers can be used ‘non-thermally’ only if the average power is less than a tenth of a watt. With a higher amount of average power a pulsed laser will act comparable to a cw laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02030877
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Schriftenschau (1980)
    Springer
    Journal of ornithology 121 (1980), S. 293-303 
    Details
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01647622
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    VUV laser application in medicine? Dosimetry and theory for laser-tissue interactions (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 315-326 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract At present no medical applications are known for VUV radiation; there seems to be no convincing evidence for using such wavelengths in laser therapy. To predict future VUV applications in medicine, an overview of the problems of dosimetry and laser-tissue interactions from the UV up to the MIR are discussed. The most important parameters for the laser-tissue interaction are the effective optical penetration depth of tissue and the pulse duration and repetition rate of the laser radiation. For the VUV and UV region the risk of mutagenicity has to be taken into consideration. Photorefractive surgery of the cornea at 193 nm as an example of the photoablation effect gives a brief impression of medical laser applications at the border of the VUV region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385863
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The cosmo-petrological significance of the coalescence of microchondrules with the decrease of volatiles in chondrites (1969)
    Springer
    Astrophysics and space science 4 (1969), S. 3-43 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The type I carbonaceous chondrites, with volatiles between 24 and 30% (at 1000 C, N2 atm.), contain the maximum percentage of the low-temperature ground mass, in which the high-temperature minerals are dispersed as ‘microchondrules’. In the type II carbonaceous chondrites (vol. 12–24%), the loosely cohering aggregates of microchondrules, ‘grape-bunch chondrules’, reach a maximum. The type III carbonaceous chondrites and some enstatite chondrites (vol. 2–12%) contain the maximum of the ‘partly coalesced chondrules’, in which microchondrules of olivine and nickel-iron appear. The ureilites are interpreted as impact shocked aggregates of microchondrules in differing states of coalescence. The ‘fully coalesced chondrules’ are characteristic for the ordinary chondrites with volatiles below 1%. It appears that the evolution of chondrules with the decrease of volatiles in meteorites subdivides into: (A) primary condensation of microchondrules with diameters of 0.01 mm; (B) secondary accretion of the former into the chondrules of diameter range ±1 mm. The observations may be explained through the hypothesis that at the highest-temperature stage of condensation of the asteroid-type parent body was an incandescent cloud (preserved through the solidification of chondrules at an early stage of degassing) covered with cosmic dust. The carbonaceous chondrites orginate from the marginal incandescent fog and the correspondingly deeper zones of the incandescent cloud mantle. The absence of typical chondritic rocks on earth may be explained by the slower cooling rate of this celestial body of relatively greater mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651261
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Eine Hyperfeinstruktur-Analyse der Grundkonfigurationen 5d 8 6s 2 und 5d 9 6s des Pt-I Spektrums (1975)
    Springer
    The European physical journal 273 (1975), S. 313-320 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of the ground configurations 5d 8 6s 2 and 5d 9 6s of the stable Platin isotopes 194, 195, 196, 198 was analyzed. For the isotope 195 a complete set of the magnetic splitting constantsA is given. TheA constants of the levels 5d 8 6s 2 3 P 1 and1 D 2 were determined for the first time. From these data the electronic splitting constants a6 s=l010(10) mK, ad 3/2=57 (6) and ad 5/2=27 (2) mK could be evaluated. The effect of core polarization is discussed and a fieldκ cp=−5.6(1.0) a.u. per 5d-electron spin is found. Also the isotopic shift is determined and for the mean quadratic nuclear charge radius the valueΒδ 〈r 2〉=0.095 (10) fm2 is derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435572
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Molekularstrahl-Experimente an zweiatomigen Molekülen in angeregten Schwingungszuständen: Elektrisches Dipolmoment und Quadrupolkopplungskonstante von CsF bisv=8 (1971)
    Springer
    The European physical journal 249 (1971), S. 168-184 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Radio frequency spectra of CsF in the rotational stateJ=1 have been measured for the vibrational statesv=0, 1,..., 8 using the molecular beam electric resonance method. The analysis of the spectra yields the electric dipole moment μv and the quadrupole coupling constanteq v Q connected with the quadrupole moment of the Cs nucleus. The results are: $$\begin{gathered} \mu _\upsilon = 7.8478 + 0.07026(\upsilon + 1/2) + 0.000195(\upsilon + 1/2)^2 debye \hfill \\ eq_\upsilon Q/h = 1245.2 - 16.2(\upsilon + 1/2) + 0.31(\upsilon + 1/2)^2 kHz. \hfill \\ \end{gathered} $$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408815
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Über die Störung eines Lichtbogens durch Tauchsonden (1958)
    Springer
    The European physical journal 151 (1958), S. 460-482 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Zur Aufklärung der Störung eines Lichtbogens durch Tauchsonden wurden dünne Drahtsonden durch einen stromstarken, frei-brennenden Lichtbogen geschlagen, deren Störeffekte studiert und von diesen auf den Mechanismus der Störursachen zurückgeschlossen. Hiernach setzt sich die Bogenstörung durch Tauchsonden aus zwei Komponenten zusammen: 1. Aus einer rein thermischen Störung dünner Sonden beim Durchgang durch die Bogenachse als Effekt einer teilweisen Abdeckung des Hauptentladungskanals und 2. aus einer elektrischen Störung als Folgen des Verlaufs der Stromspannungscharakteristiken in dem dem Sondenkreis parallelen Bogenteil, dann einer Plasmaströmung im Bogen und schließlich des Kathodenmechanismus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01337945
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Weitere Messungen zur Anisotropie der intermolekularen Wechselwirkung durch Streuung von Molekülen in definiertem Quantenzustand (1969)
    Springer
    The European physical journal 226 (1969), S. 139-155 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a previous paper the anisotropy parameter of the attractive part of the intermolecular potential has been determined from total cross sections measured by scattering of TlF-molecules in selected rotational states by rare gases. In this series of papers, further measurements on the systems TlF-He, Ne, Ar, Xe, CH4, and CsF-He, Ar will be described. In the case of CsF-He, it has been possible to determine the anisotropy parameter of the repulsive part of the potential additionally, by comparing cross sections related to different rotational states over a large velocity range and by using the high energy approximation. The determination of the anisotropy parameter for the repulsive potential requires knowledge of the parameters of the angle averaged potential. Part I describes the determination of these parameters for a Lennard-Jones-potential from measurements of the velocity dependence and the absolute value of the total cross section by scattering of not state selected CsF-molecules by He and Ar. Since these systems show no glory undulations in the experimentally accessible velocity range, they require an evaluation procedure, which is independent of the appearance of such undulations. The procedure described below only uses the velocity dependence of the cross section itself by fitting of quantum mechanically calculated cross sections. The finite resolving power of the apparatus and the influence of velocity distributions are taken into account. The results are communicated, the parallel evaluation of an experiment on K-Ar serves as a test for the procedure described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392017
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Weitere Messungen zur Anisotropie der intermolekularen Wechselwirkung durch Streuung von Molekülen in definiertem Quantenzustand (1969)
    Springer
    The European physical journal 226 (1969), S. 279-292 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Improved measurements of the ratio of scattering cross sections for various molecular rotational states are reported for scattering of TlF in rotational states ¦J, M〉=¦1, 0〉 and ¦1, 1〉, and CsF in rotational states ¦2, 0〉 and ¦2, 2〉 by rare gases. The results are interpreted in terms of an angle dependent attractive potentialV=−2ε(r m /r) 6(1+q 6 P 2(cosΘ) in which the repulsive part of the interaction is neglected. The “high energy” approximation is used to calculate the cross section, which contains the velocity dependence and the state dependence as factors. The experiments show for all scattering partners with the exception of He and Ne, that the state dependence is velocity independent. In those cases this result provides a justification for the neglect of the repulsive potential term. The results for the anisotropy parameterq 6, which to a good approximation depends only on properties of the moleculus, are:q 6=0.23±0.01 for TlF,q 6=0.28±0.02 for CsF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392090
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Anomale Röntgenstreuung schwerer Atome im Bereich derK- undL-Kanten nach der wellenmechanischen Dispersionstheorie. II (1953)
    Springer
    The European physical journal 136 (1953), S. 511-533 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338942
    Location Call Number Expected 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...