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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 3017-3018 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 6871-6876 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a novel experimental setup using a miniature integrating sphere fitted into a cryostat to measure spectrally resolved the absolute external photoluminescence quantum efficiency ηlum in the temperature range from 6 K to beyond room temperature. Direct access to ηlum is achieved by an uncomplicated method to calibrate the spatially integrated emission spectra absolutely. The fraction of light coupled out of the sphere into the detection system is in good approximation independent of the emitted wavelength and the emission characteristics of the investigated samples, due to their smallness compared with the total sphere area. This fact is proved by theoretical calculations for the sphere throughput and the irradiance within the sphere. To demonstrate the capabilities of this setup, we investigate in high quality ZnSe/ZnMgSSe 10× multiple quantum wells, the temperature dependence of the quantum efficiency, simultaneously for the quantum well and the barrier luminescence. Within a thermal activation model, three processes are found to contribute to the thermal quenching of ηlum of the quantum well luminescence. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of public health dentistry 31 (1971), S. 0 
    ISSN: 1752-7325
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The writers of this report cite the problems and their solution, step by step, in gaining information and implementing the act of the State's Legislature to enforce fluoridation of drinking water in Illinois.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 15 (1999), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— The aim of this study was to evaluate the mechanical and physical properties of several standard size commercially available mouthguards. For the purpose of objective testing, a special study model, which the various gum shield devices could be fitted onto, was developed to record tooth deflection caused by impact forces induced by a pendulum ram impact testing machine. The data measured on teeth provided with various gum shield devices were correlated with those of unprotected teeth; this enabled the individual cushioning effects of the respective devices and their specific force conduction to be evaluated. Using mouthguards considerably diminishes the deflection of the teeth subjected to stress in comparison with the row of unprotected teeth. In addition, force is transmitted to the adjacent teeth all the way to the distal regions of the row of teeth. The individual cushioning effects are directly correlated to the thickness of the material; the force distribution is determined by the rigidity of the gum shield device. The devices examined showed considerable differences with regard to force distribution and dimensioning. The study showed that this was due to the thickness of the materials, the manufacturing process and the composition of the materials of the devices examined. In comparison to laboratory-produced devices of similar material thickness, the devices that were designed to be fitted by the user achieved significantly poorer results as regards both cushioning properties and dissipation of exerted forces.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of public health dentistry 33 (1973), S. 0 
    ISSN: 1752-7325
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: After a period of teaching dental sociology at the University of Detroit's School of Dentistry, Dr. Hoffmann migarated to Santa Fe as the dental director of New Mexico. With an abundant supply of sociological notions and experience to guide him, he now reports his notions of dental programming and dental administration in action.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Sekundäre Orbitarekonstruktionen ; Alloplastische Materialien ; Stereolithographie ; Präoperative Therapieplanung ; Computergestützte Herstellung ; Key words Secondary orbital reconstruction ; Stereolithography ; Craniofacial prostheses ; Computer-aided manufacturing ; Alloplastic materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The use of autogenous transplants and the application of intraoperatively customised alloplastic materials show, in cases of secondary orbital reconstruction, a higher postoperative morbidity caused by additional approaches to the transplant donor site. On the other hand, thorough surgical exploration and fitting of the transplants or alloplastic materials greatly prolongs operating times. For these reasons we designed ceramic implants (Bioverit) on the basis of stereolithography models and prefabricated them using a commercially available dental copy milling unit (Celay). In five cases up until now seven customised implants have been inserted for reconstruction of the lamina papyracea, zygomatic complex and infraorbital floor and rim. Encouraged by the good postoperative aesthetic and functional results, with significantly reduced operating times and morbidity in all cases, we will continue to take this technique into account for reconstruction after complex orbital fractures.
    Notes: Zusammenfassung Sowohl die Verwendung autologer Transplantate als auch der Einsatz alloplastischer Materialien zeigen bei der Rekonstruktion der knöchernen Orbita Nachteile, die sich im wesentlichen durch die zusätzliche Entnahmemorbidität, aber auch durch verlängerte Operationszeiten ergeben. Aus diesem Grund haben wir bei ausgesuchten Fällen mit extremer Bulbusdystopie traumatischer oder kongenitaler Genese Bioveritglaskeramikimplantate auf der Basis von Stereolithographiemodellen hergestellt. Bei 5 Patienten wurden bislang insgesamt 7 Keramikimplantate im Orbitabereich inseriert, die jeweils komplikationslos einheilten und nach subjektiver und objektiver Beurteilung eine deutliche funktionelle und ästhetische Verbesserung ergaben. Damit zeigt sich hier eine Alternative zu konventionellen rekonstruktiven Verfahren, da trotz des hohen Material- und Personalaufwands dieser Technik bei nur kurzer stationärer Behandlungsdauer eine frühe Rehabilitation der betroffenen Patienten erfolgen kann.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1434-601X
    Keywords: PACS: 25.30.Fj Nuclear Reactions: Inelastic electron scattering to continuum – 14.20.Dh Properties of Specific Particles: Protons and neutrons – 13.40.Gp Electromagnetic form factors – 25.10.+s Nuclear reactions involving few–nucleon systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electric form factor of the neutron G E,n has been determined at the Mainz Microtron MAMI at the low momentum transfer Q 2= 0.15 (GeV/c)2 in a measurement of the recoil polarisation ratio P x/Pz in the quasifree reaction D(e,e′n)p. At this Q 2 the influence of the nuclear binding is strong. A purely kinematical model is used to get some insight into the effect of the initial Fermi momentum distribution of the neutron. The influence of the final state interaction is determined quantitatively by a model of Arenhövel et al.. After the corresponding corrections a value of G E,n(0.15 (GeV/c)2) = 0.0481±0.0065stat±0.0053syst is obtained.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 29 (1973), S. 50-51 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Des cellules sanguines différenciées sont produites tout au long de la vic larvaire et imaginale des Insectes Orthoptères par des tissus hématopoïétiques spécialisés. Nos études morphologiques et expérimentales soulignent l'analogie que présentent ces tissus avec les organes hématopoïétiques des Vertébrés, à la fois sur le plan structural et sur la plan fonctionnel.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The prothoracic glands of permanent fifth instar larvae ofLocusta migratoria (moulting blocked by selective X-ray treatment of the hemocytopoietic tissue) are in a state of high activity as evidenced by the rate of incorporation of a labelled amino-acid into the proteins synthesized in these glands. Such permanent larvae apparently synthesize no ecdysone nor ecdysterone.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 150 (1973), S. 277-280 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Es wird eine Methode des Probenaufschlusses und der anschließenden Quecksilber-Spurenbestimmung in biologischem Material mitgeteilt, die bezüglich der Geräteausstattung und des Arbeitsaufwandes für Reihenuntersuchungen besonders geeignet ist. Die Nachweisempfindlichkeit dieser Methode beträgt bei Einwaagen von etwa 1 g Probe etwa 25 ng Quecksilber. Der für den Umweltschutz interessante Bereich von 0,05 mg/kg Hg aufwärts in biologischem Material kann demnach ohne vorherige Anreicherung erfaßt werden. Das Verfahren wird seit einiger Zeit in der Praxis erfolgreich angewendet.
    Notes: Summary A method for determination of mercury traces in biological materials is described which is considered especially suitable for routine examinations because of its utensils and labour-input. The detection limit is 25 ng/l g; therefore the range of 0.05 mg/kg, especially interesting for environmental problems, can be detected in biological materials without any concentration. The method is successfully tested under practical conditions for a while.
    Type of Medium: Electronic Resource
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