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  • 1
    ISSN: 1520-510X
    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 Chemical Society
    Organometallics 8 (1989), S. 2490-2492 
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 24-25 (1947), S. 592-593 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Medical microbiology and immunology 10 (1891), S. 367-454 
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 757-760 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: X-ray depth lithography allows the fabrication of plastic microstructures with heights of up to 1 mm but with the smallest possible lateral dimensions of about 1 μm. A resist is irradiated with "white'' synchrotron radiation through a mask that is partially covered with x-ray absorbing microstructures. The plastic microstructure is then obtained by a subsequent chemical development of the irradiated resist. In order to irradiate a reasonably large resist area, the mask and the resist have to be "scanned'' across the vertically thin beam of the synchrotron radiation. A flexible, nonexpensive and compact scanner apparatus has been built for x-ray depth lithography at the beamline BN1 at ELSA (the 3.5 GeV Electron Stretcher and Accelerator at the Physikalisches Institut of Bonn University). Measurements with an electronic water level showed that the apparatus limits the scanner-induced structure precision to not more than 0.02 μm. The whole apparatus is installed in a vacuum chamber thus allowing lithography under different process gases and pressures.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The aim of the present study was to evaluate the possible benefit of platelet-rich plasma (PRP) in sinus grafting as compared with recombinant human bone morphogenetic protein-7 (rhBMP-7). For this purpose, we performed a bilateral sinus augmentation with anorganic bovine bone and simultaneous insertion of a titanium screw implant in five miniature pigs. Six hundred microliters of PRP and 15%-vol. autologous bone, which was collected with a trap during preparation of the implant recipient site, were added to the right sinus and 420 μl rhBMP-7 to the left sinus. A polychrome sequential labeling was performed. The animals were sacrificed 6 weeks after surgery. Undecalcified ground sections were evaluated by microradiography, digitized histomorphometry and under fluorescent light. The mean bone–implant contact using rhBMP-7 was 45.8% and 5.7% under PRP (P=0.002). The mean height of newly mineralized bone in the augmented area using rhBMP-7 amounted to 8.3 mm as opposed to 3.6 mm under PRP (P=0.013). Using PRP, the mean area of the newly formed bone was enhanced (51.3%) as compared with rhBMP-7 (33.1%); however, this difference was not statistically significant (P=0.081). In conclusion, under the selected experimental conditions the use of rhBMP-7 led to superior outcomes with regard to the osseointegration of dental implants and the height of new bone as compared with the use of PRP.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Computing 53 (1994), S. 277-287 
    ISSN: 1436-5057
    Keywords: 65G10 ; Interval library ; IEEE-754 arithmetic standard ; C, C++
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In den weit verbreiteten Programmiersprachen wird der Intervalldatentyp nicht unterstützt. Daher benötigt man für die Implementierung von Algorithmen, die auf Intervallarithmetik basieren, spezielle Programmierumgebungen oder zumindest spezielle Programmbibliotheken. In diesem Artikel stellen wir die C++-Klassenbibliothek PROFIL vor, die eine anwenderfreundliche Umgebung für die Implementierung von Intervallalgorithmen darstellt. Die Entwicklung von PROFIL wurde von den beiden Hauptzielen Geschwindigkeit und Portabilität geleitet. Daher basieren alle Intervalloperationen von PROFIL auf BIAS (Basic Interval Arithmetic Subroutines). BIAS definiert eine einheitliche und portable Schnittstelle für die grundlegenden Intervalloperationen von skalaren bis hin zu Matrixoperationen. Dabei ist die Schnittstelle unabhängig von einer speziellen Intervalldarstellung oder von speziellen Berechnungsmodi, erlaubt aber dennoch maschinenspezifische und schnelle Implementierungen. Basierend auf dieser allgemeinen Spezifikation stellen wir eine Implementierung in C vor, die eine Intervalldarstellung in der Form untere/obere Grenze sowie gerichtete Rundungen verwendet. Durch Verwendung eigener Assemblerroutinen (insgesamt nur ca. 10 Assemblerinstruktionen) zur Umschaltung der Rundung sowie durch weitestgehende Vermeidung überflüssiger Vorzeichentests und Rundungsumschaltungen wird der Aufwand für die Intervalloperationen drastisch reduziert. Dies ist insbesondere für RISC-Architekturen wichtig, auf denen Gleitkommaoperationen in wenigen Maschinentaktzyklen ausgeführt werden können. Vergleiche mit anderen Intervallpaketen zeigen eine Geschwindigkeitssteigerung um etwa eine Größenordnung.
    Notes: Abstract The interval data type is currently not supported in common programming languages. Therefore the implementation of algorithms using interval arithmetic requires special programming environments or at least special libraries. In this paper we present the C++ class library PROFIL which provides a user friendly environment for implementing interval algorithms. The main goals in the design of PROFIL were speed and portability. Therefore all interval operations in PROFIL use BIAS (Basic Interval Arithmetic Subroutines) [16]. BIAS defines a concise and portable interface for the basic scalar, vector, and matrix operations. The interface is independent of a specific interval representation or computation but permits machine specific and fast implementations. Based on this general specification we present an implementation in C using a lower/upper bound representation of intervals and directed roundings. By using few assembler instructions for switching the rounding modes and avoiding sign tests and rounding mode switches wherever possible, the computational costs of the interval operations were reduced significantly. This is especially important for RISC machines, where floating point instructions can be executed in few machine cycles. Comparisons with other interval arithmetic packages show an improvement in speed of about one order of magnitude.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 66 (1984), S. 365-366 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Studying the blood picture of 11 patients with Martin-Bell syndrome, we found the erythrocytes relatively hyperchromic when compared to the data from 171 matched controls living in the same institution. Because mean corpuscular hemoglobin is increased also in patients with folic acid deficiency states, we feel that our data provide further evidence that Martin-Bell syndrome is an inherited disease of folate metabolism.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geometry 10 (1977), S. 85-105 
    ISSN: 1420-8997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In [3] F. Bachmann defined chains of perpendiculars for a geometric structure which is endowed with a set of lines and a symmetric orthogonality relation on this set, and he studied these chains in the group plane of a Hjelmslev group. All Bachmann groups (the groups which are the main subject of [1]) are Hjelmslev groups, and the theory of Hjelmslev groups includes also Hjelmlev's theory of “Allgemeine Kongruenzlehre”. In a Hjelmslev group, the chains of perpendiculars are closely related to the subgroup which is generated by the points. In this paper we establish some results concerning chains of perpendiculars mainly with regard to Bachmann groups.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geometry 11 (1978), S. 93-105 
    ISSN: 1420-8997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Let be given a geometric structure with a set of lines and a symmetric orthogonality relation. F. Bachmann defined in [3] chains of perpendiculars in such a structure, and studied those chains in Hjelmslev-groups. All AGS-groups (= groups treated in [1]) are Hjelmslev-groups, and the theory of Hjelmslev-groups includes also Hjelmslev's concept of “Allgemeine Kongruenzlehre”. In Hjelmslev-groups, chains of perpendiculars are closely related to the group generated by the points. We establish some results about chains of perpendiculars in special classes of Hjelmslev-groups.
    Type of Medium: Electronic Resource
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