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  • Articles: DFG German National Licenses  (7)
  • 41.80 Dd  (3)
  • Chemistry  (2)
  • Chest radiography  (2)
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  • Articles: DFG German National Licenses  (7)
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Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Near infrared lasing transitions in Ar, Kr, and Xe atoms pumped by a coaxial e-beam (1988)
    Springer
    Applied physics 47 (1988), S. 187-190 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 FN ; 41.80 Dd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optimizations of gas composition and input energy were performed for gas mixtures containing a buffer gas and either Ar, Kr or Xe as the lasing gas. The total gas pressure was varied between 1 and 14 bar and the input energy from 0.03 to 0.7 J/cm3. The excitation source was a small coaxial electron beam with a pumping length of 20 cm and a pulse length of 30 ns (FWHM). From an active volume of 13.3 cm3 a maximum output energy of 12 mJ was obtained from a gas mixture containing 0.3% Xe in Ar at a total gas pressure of 10 bar. The intrinsic efficiency was 0.9%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684086
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Intrinsic efficiency and critical power deposition in the e-beam sustained Ar:Xe Laser (1991)
    Springer
    Applied physics 52 (1991), S. 277-280 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 Fn ; 41.80 Dd ; 52.80 Tn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental investigations on an e-beam sustained near infrared Ar:Xe laser have been carried out to determine the intrinsic efficiency at optimized conditions. A parametric study at different sustainer currents reveals a maximum output energy depending on current density. Up to 8 bar the optimized laser output power per unit volume increases linearly with 1.1MW/1 bar. Intrinsic efficiencies of up to about 8% are feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325405
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spectral line competition in a coaxial electron-beam-pumped high pressure Ar/Xe laser (1991)
    Springer
    Applied physics 52 (1991), S. 336-340 
    Details
    ISSN: 1432-0649
    Keywords: 34.80 D ; 41.80 Dd ; 42.55 F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to study the kinetic mechanism of the e-beam pumped Ar/Xe laser, the temporal profiles of individual laser lines during multiline oscillation have been measured as a function of power deposition (1–12MW/cm3) and gas laser pressure (2–14 bar) using a short pulse (30 ns) coaxial electron beam as excitation source. It was found that the optimum output energy at each pressure was obtained at the same specific power deposition. Strong line competition has been observed between the 2.65 and 1.73 μm transitions. In order to explain our results we suggest that besides electron collision mixing (ECM) between the 5d and 6p levels of Xe, there is also a redistribution between all 6p levels which strongly favours the lower levels at higher pumping densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325492
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Bronchiolitis obliterans with organizing pneumonia. Clinical features, pathology and imaging findings (1996)
    Springer
    Der Radiologe 36 (1996), S. 560-566 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Bronchiolitis obliterans mit organisierender Pneumonie ; BOOP ; Thoraxübersichtsaufnahme ; Computertomographie ; Key words Bronchiolitis obliterans with organizing pneumonia (BOOP) ; Chest radiography ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Bronchiolitis obliterans with organizing pneumonia (BOOP) is a clinicopathological syndrome of unknown etiology. Histopathologically, it is characterized by plugs of fibroplastic connective tissue within respiratory bronchioles, mononuclear cell infiltrates in parenchyma adjacent to the affected bronchioles and foam cells within alveolar airspaces. The disease usually presents as a subacute illness with complete resolution. A subset of BOOP, however, is associated with a fulminant course and a high lethality due to respiratory failure. Early diagnosis and therapy are mandatory. Chest radiography, computed tomography (CT), bronchoalveolar lavage (BAL) and open lung biopsy are the primary diagnostic techniques. Radiographically, BOOP is characterized by patchy areas of consolidation that are usually bilateral, peripheral and often migratory. In some cases small, round opacities may be observed as the only abnormality. CT can show the pattern of ground glass opacities, areas of airspace consolidation and small, round opacities, while considerable fibrotic change is usually not seen. A reticular roentgenographic pattern, fibrotic changes mainly in subpleural location at CT, lack of lymphocytosis in BAL fluid and histological features of usual interstitial pneumonitis and BOOP in biopsy specimens are all considered risk factors for a fatal outcome.
    Notes: Zusammenfassung Die Bronchiolitis obliterans mit organisierender Pneumonie (BOOP) ist eine klinisch-pathologisch definierte Lungenerkrankung oft ungeklärter Ätiologie, histologisch gekennzeichnet durch proliferierendes Granulationsgewebe in den respiratorischen Bronchiolen sowie interstitielle mononukleäre Zellinfiltrate und Schaumzellen in den Alveolen. Meist nimmt sie einen blanden Verlauf und hat eine günstige Prognose. Doch auch fulminante Verläufe mit letalem Ausgang sind beschrieben. Eine frühzeitige Diagnosestellung und Therapieeinleitung bestimmen wesentlich den Behandlungserfolg. Eckpfeiler der Diagnostik sind Übersichtsaufnahme und Computertomographie des Thorax, bronchoalveoläre Lavage (BAL) und Lungenbiopsie. Die Thoraxübersichtsaufnahme zeigt typischerweise bipulmonale, periphere, kleinfleckig-konfluierende Verschattungen, oft mit einer Migrationstendenz. Computertomographisch finden sich kleinfleckige, milchglasartige oder konsolidierende Verschattungen jeweils allein oder in Kombination, ohne daß wesentliche fibrotische Veränderungen nachweisbar sind. Ein retikuläres Verschattungsmuster in der Thoraxübersichtsaufnahme, subpleurale Fibroseherde in der CT, fehlende Lymphozytose in der BAL und der histologische Nachweis einer intraluminalen und interstitiellen Entzündungskomponente mit unterschiedlichen Fibrosestadien im Sinne einer kryptogenen fibrosierenden Alveolitis gelten als prädiktive Faktoren für einen ungünstigen Verlauf der BOOP. Bei antibiotikarefraktären Infiltraten sollte an die Verdachtsdiagnose einer BOOP gedacht werden und gegebenenfalls eine histologische Untersuchung erfolgen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050111
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Bildgebende Diagnostik bei Bronchiektasen Stellenwert von CT und HRCT (1996)
    Springer
    Der Radiologe 36 (1996), S. 550-559 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Bronchiektasen ; Thoraxübersichtsaufnahme ; Bronchographie ; Computertomographie ; HRCT ; Key words Bronchiectasis ; Chest radiography ; Bronchography ; Computed tomography ; HRCT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Various diseases can cause bronchiectasis as a result of inflammatory bronchial wall damage. The diagnosis is based on imaging techniques, which are also required to assess the extent and localization of dilated bronchi and possible causes. Chest radiography only occasionally allows the diagnosis of bronchiectasis (Fig. 2) and is usually not a sufficient basis for therapeutic decisions (Fig. 1 a), but it is important for follow-up studies. Bronchography (Fig. 1 b) was considered the diagnostic procedure of choice in suspected bronchiectasis for decades. Being an invasive procedure, it has recently been almost completely replaced by computed tomography (CT), which can also demonstrate associated pulmonary abnormalities (Fig. 6) in addition to visualizing the bronchi. CT diagnosis of bronchiectasis is based on the demonstration of bronchial dilatation relative to the adjacent pulmonary artery (Figs. 4, 5, 7–9), lack of bronchial tapering (Figs. 3, 4, 10) and visualization of bronchi in the lung periphery (Figs. 3, 5, 8, 10). In suspected bronchiectasis high-resolution scans should be obtained during inspiration. Contiguous, thicker slices or scans taken during expiration may be required in particular cases.
    Notes: Zusammenfassung Bronchiektasen entstehen im Rahmen unterschiedlicher Erkrankungen durch inflammatorische Schädigung der Bronchialwand. Sie werden im wesentlichen mittels bildgebender Verfahren diagnostiziert, die auch erforderlich sind, um Ausmaß, Lokalisation, mögliche Ursachen und Begleitveränderungen darzustellen. Die Thoraxübersichtsaufnahme erlaubt nur in wenigen Fällen eine eindeutige Diagnose und reicht in der Regel zur Therapieplanung nicht aus. In der Verlaufskontrolle von Komplikationen besitzt sie dagegen einen hohen Stellenwert. Die Bronchographie galt über Jahrzehnte als Verfahren der Wahl in der Bronchiektasendiagnostik, wurde aber wegen ihrer Invasivität in den letzten Jahren durch die Computertomographie weitgehend ersetzt. Diese kann neben der bronchialen Dilatation auch assoziierte Veränderungen des Lungenparenchyms darstellen. Die computertomographische Diagnose von Bronchiektasen beruht auf dem Nachweis einer fehlenden Verjüngung des Bronchus sowie seiner Dilatation im Vergleich mit der begleitenden Pulmonalarterie. Auch der Nachweis von Bronchien in der Lungenperipherie gilt als wichtiges Kriterium. Die Untersuchung sollte mit hochauflösenden Schichten in Inspiration erfolgen; dickere Schichten sowie Exspirationsaufnahmen können unter bestimmten Umständen nützlich sein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050110
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Querrißbildung in 0/90/0 CFK-LaminatenHerrn Prof. Dr. rer. nat. Wolfgang Bunk zum 60. Geburtstag gewidmet (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 313-322 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Cross-ply Cracking in 0/90/0 CFRP LaminatesCross-ply cracking in carbon fibre reinforced plastics (CFRP) with thermoset as well as thermoplastic matrix systems was investigated on 0/90/0 laminates with varying 90°-ply thickness. Since in an angle ply laminate the 90°-ply fails first, the higher strength of the other plies cannot be taken advantage of. For this reason efforts have to be done to increase the transverse strength (strain) of fibre reinforced plastics. In the first place thus it is necessary to investigate the influence of the different parameters which contribute to the transverse strength. In this work the influence of matrix (fracture strain), fibre/matrix interface, voids and constraining effect of neighbouring plies is investigated. With the aid of two-parameter Weibull distributions of the 90°-ply fracture strain, which describe the phenomenon of multiple cracking in a specimen, it was found that the constraining effect due to neighbouring plies, improved fibre/matrix interface and matrix ductilty increase, whereas voids decrease the transverse fracture strain.
    Notes: Querrißbildung in kohlefaserverstärkten Kunststoffen (CFK) mit sowohl duromerer als auch thermoplastischer Matrix wurde untersucht an 0/90/0 Laminaten mit unterschiedlicher 90°-Schichtdicke. Da die 90°-Schicht in einem Mehrschichtverbund zuerst versagt, kann die höhere Festigkeit der anderen Schichten nicht ausgenutzt werden. Aus diesem Grunde muß nach Möglichkeiten gesucht werden, die Querzugfestigkeit (Festigkeit senkrecht zur Faser) von Faserverbundwerkstoffen zu erhöhen. Zunächst ist es deshalb notwendig, den Einfluß der Parameter, die die Querzugfestigkeit beeinflussen, zu untersuchen. In dieser Arbeit ist der Einfluß der Matrix(-Bruchdehnung), der Faser/Matrix-Grenzschicht, der Lunker und der Stützwirkung von Nachbarschichten ermittelt worden. Mit Hilfe von zweiparametrigen Weibull-Verteilungen der 90° -Schicht-Bruchdehnung, die das Phänomen der mehrfachen Rißbildung in einer Probe beschreiben, wurde festgestellt, daß die Stützwirkung der Nachbarschichten, verbesserte Faser/Matrix-Haftung und Matrixduktilität die Bruchdehnung erhöhen und Lunker die Bruchdehnung verkleinern.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180909
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    DFVLR-Werkstoff-Kolloquium. - Verbundwerkstoffe -. Kurzfassungen der Veranstaltung vom 3. 12. 1980 in Porz/Wahn. Bruchmechanik an Faserverbundwerkstoffen am Beispiel von B/AL und CFK (1981)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 104-105 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19810120307
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    Paper (German National Licenses)
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