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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1011-1013 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron-beam-induced current (EBIC) profiles of Mo/CuInX2/CdS/ZnO thin film solar cells with X=Se, S were recorded at different temperatures. We measure the collection efficiency of cells as a function of the beam energy and subsequently identify the depth dependent collection function. For a CuInS2 based cell, charge collection is maintained by diffusion transport of minority carriers to the junction with an effective diffusion length of 1.3±0.2 μm. This value is independent on temperature between 123 and 373 K. A CuInSe2 based cell exhibits increased collection of charge carriers created at the back contact on decreasing temperature. The temperature variation of the EBIC profiles is discussed considering the effect of bulk and grain boundary recombination. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 141-143 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigations of the geometric and electronic properties of ternary Ce-based heavy fermion systems CeT2X2 (T : Ni,Pd,Rh; X : Ge,Si) were carried out by means of electron spectroscopic methods. The main problem for these surface-sensitive techniques is the preparation of well-ordered and atomically clean surfaces. The ternary substance CeNi2Ge2 was grown on a W(110) substrate by MBE with subsequent annealing. A nearly layer-by-layer growth mode was detected using MEED. The annealed layers are ordered, but show small Ni2Ge crystalline islands. The composition was characterised by means of AES in dependence of the substrate as well as the annealing temperature. Electronic properties are investigated by angle resolved photoelectron spectroscopy.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2102
    Keywords: Key words MR angiography • Time of flight • Phase contrast • Peripheral arteries ; Schlüsselwörter MR-Angiographie • Time-of-Flight • Phasenkontrast • Periphere Gefäße
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ziel der Studie war die Entwicklung einer praktikablen Untersuchungsstrategie für die MRA der unteren Extremität. Im Probandenteil der Studie wurden 3 MRA-Techniken (2D-TOF mit venöser Sättigung, 3D-Magnitude-Kontrast und 2D-Phasenkontrast mit EKG-Triggerung) intraindividuell prospektiv verglichen. Im Patiententeil der Studie wurden bei n = 45 klinischen MRA-Untersuchungen mittels EKG-getriggerter 2D-PCA 230 Gefäßsegmente intraindividuell mit der arteriellen DSA nach einem fünfstufigen Scoresystem verglichen. EKG-getriggerte PCA-Techniken zeigten die beste Bildqualität in allen Gefäßabschnitten. Dabei betrug der mittlere Rang des Friedman-Testes der PCA-Technik in der Beckenetage 1,2 und an der Oberschenkel- bzw. Knie-/Unterschenkeletage 1,0. Die Patientenuntersuchungen zeigten eine gute Übereinstimmung von DSA und MRA mit einem signifikanten Spearman-Korrelationskoeffizient für die Becken-, Oberschenkel- und Knieetage. MRA-Untersuchungen der unteren Extremität sind unter Einsatz der EKG-getriggerten 2D-PCA-Technik mit vertretbarem Zeitaufwand möglich. Die Abbildungmöglichkeiten der untersuchten Gefäßetagen entsprechen den Bildeinstellungen der DSA und die klinische Auswertung ergab eine gute (Kappa 〉 0,61) bis sehr gute (Kappa 〉 0,81) Übereinstimmung in der Beurteilung pathologischer Gefäßveränderungen.
    Notes: Summary Purpose: To investigate whether phase-contrast MRA is a clinically suited approach to examine arteries of the pelvis and lower extremities. Methods: The study was divided into two parts, a volunteer study and patient study. Three MRA techniques – 2D TOF with venous saturation, 3D magnitude contrast and 2D phase contrast with ECG triggering – were intraindividually compared in 15 volunteers and evaluated by three blinded readers. Subsequently, a total of 230 vessel segments of 45 MRA studies using ECG-triggered phase contrast were compared with intraarterial DSA. All vessel segments were scored by three blinded readers using a five-point scale with DSA serving as the gold standard. Results: ECG-triggered phase contrast provided better image quality than the other MRA techniques as assessed by the Friedman test. Clinical studies demonstrated a significant correlation of DSA and MRA as assessed by the Spearman correlation and kappa statistics for individual readers. Conclusion: MRA of the pelvis and lower extremities may be performed with 2D ECG-triggered phase-contrast MRA within a reasonable time frame ( 〈 30 min). MRA slabs provide orientation similar to that with DSA projections and good to very good correlation of vessel pathology as shown by kappa statistics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Internist 38 (1997), S. 1131-1142 
    ISSN: 1432-1289
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Nach vielen Jahren der Stagnation zeigen sich Fortschritte bei der Therapie niedrig-maligner Non-Hodgkin-Lymphome. Vielversprechende Ergebnisse gibt es von gut kontrollierten randomisierten Studien, die einen Vorteil der Interferon-Erhaltungstherapie bei zentroblastisch-zentrozytischen Lym-phomen zeigen. Purinanaloga werden in Zukunft die Therapiemöglichkeiten der Patienten sicherlich ebenfalls verbessern. Dies wurde bei der chronischen lymphatischen Leukämie bereits gezeigt und betrifft in Zukunft sicherlich auch andere Lymphomentitäten. Die vielversprechendste Neuerung ist sicherlich die Hochdosistherapie mit Stammzell-Transplantation, die sich beim Plasmozytom und beim rezidivierten hochmalignen NHL bereits in prospektiv randomisierten Studien einer konventionellen Therapie als überlegen erwiesen hat.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 1923-1935 
    ISSN: 0029-5981
    Keywords: recursive autoadaptive multidimensional numerical integration ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This article introduces quadtree and octree like methods to numerical integration. Four recursive and auto-adaptive algorithms are presented: one for two-dimensional integrals over a triangular region, one for two-dimensional integrals over a quadrilateral region, one for three-dimensional integrals over a tetrahedral region and one for three-dimensional integrals over a cubic region. The algorithms have been proven to work fast. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0749-503X
    Keywords: Ty1 retrotransposon ; Ty2 ; primer binding site ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: In the reverse transcription initiation complex of the yeast Ty1 retrotransposon, interaction between the template RNA and primer tRNAiMet is not limited to base pairing of the primer binding site (PBS) with ten nucleotides at the 3′ end of tRNAiMet but three regions named boxes 0, 1 and 2.1 interact with the T and D stems and loops of tRNAiMet. Sequence comparison of 33 Tyl elements and 13 closely related Ty2 elements found in the yeast genome shows that the nucleotide sequence of all elements is highly conserved in the region spanning the PBS and the three boxes. Since this domain of the template RNA encodes a portion of protein TyA, we have calculated its amino acid profile and its nucleotide profile to evaluate the role played by nucleotide sequence conservation in the selection for TyA function and in the maintenance of base pairing interactions for the priming function of Tyl RNA. Our results show that the nucleotide sequence conservation of Ty1 RNA is constrained not only by selection for Ty1 function but also by maintenance of a given nucleotide sequence able to base pair with the tRNAiMet in the primer-template initiation complex. © John Wiley & Sons, Ltd.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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