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
    Far-field characteristics of mid-infrared angled-grating distributed feedback lasers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6997-7005 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The far-field emission characteristics of mid-infrared angled-grating distributed-feedback (α-DFB) lasers with W active regions are calculated using a self-consistent beam-propagation formalism that is more general than previous analyses. The theoretical projections are compared with the results of an experimental study of optically pumped α-DFB devices. Near-diffraction-limited beam quality is obtained both theoretically and experimentally for pump stripes ≤50 μm wide. While simulations employing the theoretical linewidth enhancement factor of 1.7 for the homogeneously-broadened W-laser gain spectrum predict that the good beam quality should be retained for stripes as wide as (approximate)200 μm, the data indicate a much more rapid degradation. That finding can be reproduced only by assuming that inhomogeneous broadening increases the structure's linewidth enhancement factor to (approximate)5. The experiments and theory also yield a steering of the output beam to off-normal angles as large as 6° when temperature tuning shifts the gain peak away from the grating resonance. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326858
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Mid-infrared angled-grating distributed feedback laser (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3164-3166 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report near-diffraction-limited output from an angled-grating distributed feedback type-II W laser emitting near 3.4 μm. For pulsed optical pumping of a 50-μm-wide stripe at 78 K, the far-field beam divergence angle was only 1.4°. The slope efficiency was 64% of that for a conventional Fabry–Pérot laser on the same bar. However, the spectral linewidth decreased by only a factor of 2. The beam quality was substantially better than that for the Fabry–Pérot laser out to stripe widths of at least 800 μm. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126617
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Continuous-wave operation of λ=3.25 μm broadened-waveguide W quantum-well diode lasers up to T=195 K (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 256-258 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mid-infrared (λ=3.25 μm) broadened-waveguide diode lasers with active regions consisting of 5 type-II "W" quantum wells operated in continuous-wave (cw) mode up to 195 K. At 78 K, the threshold current density was 63 A/cm2, and up to 140 mW of cw output power was generated. A second structure with ten quantum wells operated up to 310 K in pulsed mode. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125739
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Distribution of metals during digestion by cutthroat trout fed benthic invertebrates contaminated in the Clark Fork River, Montana and the Coeur d'Alene River, Idaho, U.S.A., and fed artificially contaminated Artemia (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 56 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The concentrations of essential amino acids in three, undigested invertebrate diets collected from the Clark Fork River (CFR) for cutthroat trout were similar to each other, but were c. 25–75% less than Artemia that were exposed to a mixture of arsenic, copper, cadmium, lead and zinc in the laboratory. The Artemia diet appeared less palatable and the texture, quantity and appearance of the intestinal contents differed between fish fed the Artemia and CFR diets. The Pb% in the fluid fraction of the intestinal contents was greater for the Artemia (29%) than for the CFR diets (10–17%), and the Cu% in the amino acid plus metal fraction of the intestinal contents was greater for the Artemia (78%) than for two of the three CFR diets (67% and 70%). Intestinal contents of fish fed invertebrate diets collected from various sites on the Coeur d'Alene River (CDA), Idaho, were similar in texture, quantity, and appearance. For fish fed the CDA diets, differences in the distribution of metals among fractions of the digestive fluids appeared to be related to concentrations of metals in the invertebrate diets. Pb% was lowest of all metals in the fluid portion of the intestinal contents. However, 〉80% of all metals in the hind gut were associated with the particulate fraction where they may still be available for uptake through pinocytosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02093.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Ein Fallbericht: Der eitrige Perikarderguß (2000)
    Springer
    Zeitschrift für Kardiologie 89 (2000), S. 464-468 
    Details
    ISSN: 1435-1285
    Keywords: Key words Cardiac tamponade – cardio-pulmonary resuscitation – retropharyngeal abscess –streptococcus milleri ; Schlüsselwörter Perikardtamponade – kardiopulmonale Reanimation – Retropharyngealabzeß–Streptococcus milleri
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wir berichten über eine 67jährige Patientin, die im Rahmen einer Perikardtamponade plötzlich reanimationsbedürftig wurde. Die Ergußdrainierung zeigte eine putride Flüssigkeit, aus der Streptococcus milleri isoliert werden konnte. Fremdanamnestisch litt die Patientin schon 4 Tage vor dem Ereignis an einer allgemeinen körperlichen Schwäche, Dyspnoe, Fieber bis 39°C, Halsschwellung und Schluckbeschwerden. In einer CT-Untersuchung zeigte sich eine Entzündungsstraße ausgehend von der rechten Tonsille über das Mediastinum bis hin zum Perikard. Nach operativer Sanierung des retropharyngealen Abszesses heilte die Erkrankung vollständig aus. Das Krankheitsbild der eitrigen Perikardtamponade muß differentialdiagnostisch immer an einem hämatogenen, lymphogenen oder per continuitatem sich ausbreitenden Prozeß denken lassen. Der Erregernachweis im Erguß sowie die typische Anamnese ließen an eine oropharyngeale Ursache denken.
    Notes: Summary We present the case of a 67 year old woman who was resuscitated due to cardiac tamponade. Examination of the pus fluid showed a bacterial infection with streptococcus milleri. Four days before resuscitation the patient experienced weakness, dyspnoe, increased temperature (39° C), swelling of the neck, and pain on swallowing. Using computed tomography, examination revealed an infection extending from the right tonsil to the mediastinum and into the pericardium. After surgery to remove the retropharyngeal abscess, the patient healed well. Therefore, on presentation of a cardiac tamponade, possible hematogenous or lymmphogenous causes or per continuitatem infections should always be considered. In this case the germs in the fluid and the typical patient history indicated an oropharyngeal reason.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003920050512
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Nachruf auf Prof. Dr. med. Sven Effert (2000)
    Springer
    Intensivmedizin und Notfallmedizin 37 (2000), S. 161-162 
    Details
    ISSN: 1435-1420
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003900050319
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Kernspintomographische Darstellung koronarer Bypassgefäße – Vergleich der Haste- und Fisp-3-D-Angiographiesequenz mit der konventionellen Koronarangiographie (2000)
    Springer
    Zeitschrift für Kardiologie 89 (2000), S. 7-14 
    Details
    ISSN: 1435-1285
    Keywords: Key words Magnetic resonance imaging – coronary angiography – coronary artery bypass grafts – MR – coronary angiography ; Schlüsselwörter Kernspintomographie – Koronarangiographie – koronare Bypassgefäße – MR-Koronarangiographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Ziel der Studie war die kernspintomographische Evaluierung koronarer Bypassgefäße mit der Haste- und Fisp-3-D-Angiographiesequenz unter besonderer Berücksichtigung der distalen Bypassanastomose. Eingeschlossen wurden 29 Patienten mit 74 Bypassgefäßen und insgesamt 91 distalen Anastomosen. Eingesetzt wurden eine 2dimensionale, T-2-gewichtete Turbo-Spin-Echo-Sequenz (Haste) sowie eine 3dimensionale, kontrastmittelunterstützte Angiographiesequenz (Fisp-3-D) in Atemanhaltetechnik. Sowohl mit der Haste- als auch der Fisp-3-D-Sequenz konnten 55 der 58 offenen und 15 der 16 verschlossenen Bypässe korrekt beurteilt werden, die Sensitivität und Spezifität betrug 95% und 94%. Überlegen war die Haste-Sequenz (47/63) der Fisp-3-D-Sequenz (40/63) in der Beurteilung der distalen Anastomosen. Bypasstenosen konnten lediglich in 3 von 8 Fälen diagnostiziert werden. Mit der Kernspintomographie ist mit beiden genannten Sequenzen eine nichtinvasive Evaluierung koronarer Bypassgefäße möglich, wobei die Haste-Sequenz in der Beurteilung distaler Bypassanteile überlegen ist. Eine Verbesserung der Aussagekraft der Methode ist durch den Einsatz von gefäßständigen Kontrastmitteln sowie durch die Kombination mit funktionellen Parametern wie der MR-Flußmessung zu erwarten.
    Notes: Summary The aim of the study was to evaluate the patency of coronary artery bypass grafts (CABG) with the 2D and 3D magnetic resonance (MR) imaging techniques. 29 patients with 74 bypass grafts and a total of 91 distal anastomoses were studied on a 1.5 Tesla scanner using a phased array body coil. A 2D T-2 weighted breathhold turbo spin echo sequence (Haste) and a 3D breath hold contrast enhanced MR angiography sequence (Fisp-3-D) were performed. With the Haste and Fisp-3-D sequences 55 of the 58 patent and 15 of the 16 occluded grafts were recognized; the sensitivity and specifity were 95% and 94%, respectively. With the Haste sequence 74% (47/63) and with the Fisp-3-D sequence 64% (40/63) of the distal anastomoses were seen in good image quality. Only 3 of 8 significant grafts stenoses were detected. The patency of CABGs can be evaluated non-invasively with the Haste and the Fisp-3-D angiography sequences. Better results can be expected with the development of a blood-pool contrast medium and the combination of MR flow measurements with imaging techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003920050002
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Nachruf auf Prof. Dr. med. Sven Effert (2000)
    Springer
    Zeitschrift für Kardiologie 89 (2000), S. 362-363 
    Details
    ISSN: 1435-1285
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003920050498
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Tools for tissue engineering of mineralized oral structures (2000)
    Springer
    Clinical oral investigations 4 (2000), S. 126-129 
    Details
    ISSN: 1436-3771
    Keywords: Key words Tissue engineering ; Growth factors ; Peptides ; Proteins ; Dental
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  This paper presents a short review of three groups of tools which can be or are used for the tissue engineering of mineralized oral structures: growth factor delivery systems (GFDS) and surface bioactivation with covalent bound peptides or with nanomechanically linked proteins. According to the reported personal experience of the authors, GFDS have to face the following challenging issue before being used routinely in dentistry, e.g., as a tool for reparative dentinogenesis or bone healing: adaptation of the GFDS design to the tissue where it will be implanted in order to deliver the right dose of growth factor (GF) at the right time. The bioactivation of surfaces, for example of dental implants, with covalent bound peptides or nanomechanically linked proteins represents a second innovative way to improve dental health in the future. Here we report on the experimental use of cyclic RGD peptides grafted on polymethylmethacrylate to improve osteoblast adhesion. Furthermore, we show the potential advantage of immobilizing and incorporating collagen I on titanium implant surfaces. These techniques or a combination of them will help to create improvements, for example, of dental implants in the near future. They will also help to promote bone and dentin regeneration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007840050128
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Leitlinien zur Diagnostik und Therapie des akuten Herzinfarktes in der Prähospitalphase (2000)
    Springer
    Notfall + Rettungsmedizin 3 (2000), S. 547-554 
    Details
    ISSN: 1436-0578
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Im Jahre 1996 hat die European Society of Cardiology Leitlinien zum Management des akuten Infarkts erstellt, die im Hinblick auf die Prähospitalphase im vorigen Jahr durch gemeinsame Empfehlungen der Europäische Gesellschaft für Kardiologie und des European Resuscitation Council ergänzt wurden [32, 36]. Das in Deutschland bestehende, notarztbegleitete Rettungssystem besitzt ein besonderes Potential zur qualifizierten Frühbehandlung des Infarkts. Die begrenzten Ressourcen und die Praktikabilität der Methoden setzen der Versorgung im Prähospitalbereich jedoch auch klare Grenzen. Dies zusammen unterstreicht die Notwendigkeit von Leitlinien für diesen aus quantitativer Sicht bedeutenden Schwerpunkt der Notfallmedizin. Anstatt “Myokardinfarkt” wird in der Leitlinie gelegentlich der Begriff “akutes Koronarsyndrom” verwendet. Er umfasst neben dem akuten Infarkt auch die schwere bzw. instabile Angina pectoris ohne Infarkt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100490070009
    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...