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  • Analytical Chemistry and Spectroscopy  (2)
  • Aortitis  (1)
  • Calculus of variations  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Utility of coaxial technique for renal angioplasty in patients with a difficult-to-cross stenosis (1999)
    Springer
    European radiology 9 (1999), S. 1586-1589 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Aortic arch syndrome ; Arteries ; Renal transluminal angioplasty ; Arteritis ; Hypertension ; Aortitis ; Takayasu's arteritis ; Fibromuscular dysplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to evaluate the feasibility of coaxial approach in difficult-to-cross lesions in patients with failed percutaneous transluminal renal angioplasty by conventional over-the-wire exchange technique. Twelve stenoses in 10 patients (six women and four men; age range 19 ± 7 years) with uncontrolled hypertension were treated by this method. The stenosis was caused by nonspecific aortoarteritis in 8 patients and fibromuscular dysplasia in 2 patients. It was ostial in seven and post-ostial in five vessels. Conventional exchange technique was unsuccessful in all of them. All procedures were done by femoral route. Technical success was seen in 11 (92 %), without complication. The stenosis improved from 90 ± 2.1 % (range 80–100 %) to 6 ± 7 % (range 0–20 %), blood pressure decreased from 198 ± 12.3 mm Hg (range 180–220 mm Hg)/130 ± 6.7 mm Hg (range 120–140 mm Hg) to 119 ± 5.7 mm Hg (range 110–130 mm Hg)/83 ± 3.9 mm Hg (range 80–90 mm Hg), and number of drug treatments for hypertension fell from 3.6 ± 0.52 (range 3–4) to 1 ± 0.94 (range 0–3; p 〈 0.01). Percutaneous transluminal renal angioplasty resulted in “cure” in 3 patients and “improvement” in 7 patients. Follow-up period was 3–21 months (mean 6.4 months). No restenosis was detected. Coaxial approach is safe and effective in treating difficult-to-cross lesions in which renal angioplasty by conventional exchange technique is unsuccessful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050889
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sharp dual estimates for conductance of an optimal circular cooling fin (1976)
    Springer
    Journal of optimization theory and applications 19 (1976), S. 565-575 
    Details
    ISSN: 1573-2878
    Keywords: Calculus of variations ; heat transfer ; duality theory ; minimax problems ; differential equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A cooling fin attached to a cylinder of circular cross section is considered. We obtain sharp upper and lower estimates for the maximum heat dissipation under the constraint that the total weight of the fin should not exceed a given bound. It is assumed that the boundary of the cylinder has a constant temperature and that Newton's law of cooling holds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00934655
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fourier transform Raman spectroscopic and scanning electron microscopic studies of chemical vapor deposited diamond-like carbon films (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 67-73 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A combined study based on scanning electron microscopy and Fourier transform Raman spectroscopy is presented for different kinds of diamond films. These films were obtained by the hot filament chemical vapor deposition (HFCVD) technique with both silica (SiO2) and silicon (Si) being used as substrates. CVD diamond films, having crystallite dimensions larger than about 1 μm (the wavelength for Raman excitation being 1.06 μm with an Nd:Yag CW laser), show tetrahedral chemical bonding and single-crystal structural features being characterized by the appearance of the sharp first-order 1330 cm-1 Raman line characteristic of natural or high-pressure synthetic diamonds. Films having crystalline dimensions 〈 0.1 μm still exhibit tetrahedral (sp3) bonding. For such small crystals, the wavevector conservation rule for Raman spectroscopy of single crystals of diamond breaks down and only broad features, with the most intense Raman lines falling in the range 1260-1100 cm-1, are observed. This broad feature is characterized by some additional superimposed sharp lines, the maxima of which vary from sample to sample, showing the effect of overlap of spectra from various domain sizes of the crystallites, edge effects and contribution from other forms of non-diamond carbon. The crystalline diamond peak observed at 1330 cm-1 indicates that the diamond structure, at the temperature of synthesis, is retained in these films, and the large width of the Raman peak is probably due to the presence of defects. The main low-wavenumber peaks observed in all spectra obtained with 1.06 μm excitation are interpreted as arising from the amorphous disordered sp3-bonded carbons, which are formed as precursors to the crystalline diamond grown by the HFCVD technique.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250110
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  • 4
    Electronic Resource
    Electronic Resource
    Micro-Raman analysis of thin-film diamond temperature sensors (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 24 (1993), S. 417-422 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thin-film diamond temperature sensor arrays used in harsh aerospace environments were investigated using micro-Raman spectroscopy. Raman spectra of three of the samples obtained under specific experimental conditions are presented. On annealing a sample, an increase in graphite content and restoration of long-range order in its lattice are suggested. Additionally, an untreated sample on irradiation with 1064 nm radiation from a low-power continuous-wave Nd: YAG laser exhibits an increase in graphite content. Similar irradiation of an annealed sample shows an increase in the graphite content, a decrease in diamond-like carbon content and the appearance of a band at 1607 cm-1.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250240706
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    Paper (German National Licenses)
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