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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2890-2893 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a new method for measuring time-resolved photoluminescence on a time scale of microseconds and milliseconds using correlational analysis, and we demonstrate it to work on porous silicon and GaP:Fe. We modulate the pumping laser with a pseudorandom binary sequence which yields correlational properties similar to white noise. The photoluminescence decay is computed via cross correlation of the detector signal with the pumping sequence. The presented method is highly sensitive, simple in application, and inexpensive.
    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 75 (1994), S. 4167-4170 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the recombination mechanism of the visible photoluminescence (PL) S-band in p-doped porous Si layers by time-resolved photoluminescence. From the observed "stretched-exponential'' PL decays we present a simple yet accurate evaluation method for lifetime distributions G(τ) and average recombination lifetimes 〈τ〉. The average lifetimes feature a strong temperature dependence and a characteristic thermal activation energy of 10–20 meV for low temperatures. Our results are discussed within the models of quantum-confined exciton recombination and surface state recombination.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 376-378 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A variety of SiGe quantum well (QW) samples were grown by solid-source molecular beam epitaxy (MBE) to study the influence of growth temperature TG and QW width Lz on the photoluminescence (PL) properties. For all growth temperatures investigated (350 °C≤TG≤750 °C) we found intense, well-resolved PL signals from the SiGe QWs. The PL intensity increases with TG, and the stability against measurement temperature becomes better. A formerly reported PL band below the SiGe band edge is either completely absent, or very weak in the 4.2 K spectra of our samples. Thus, the defects or complexes responsible for this signal are obviously not inherent properties of MBE growth.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1729-1731 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrametastable silicon-germanium (Si1−xGex) layers with a Ge content x in the range from about 20% to 27% were grown by Si-MBE at temperatures far below 550 °C (325–450 °C). The thicknesses of the layers (up to 500 nm) exceed the equilibrium thickness by a factor of up to 50. We observe in the as-grown samples without any annealing both the excitonic Si1−xGex band-edge luminescence and a broad alloy luminescence of unknown origin. The two peaks have an energy difference of ≈144 meV and shift linearly with the Ge content. The alloy band luminescence disappears when strain relaxation sets on upon annealing at around 600 °C.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 61 (1992), S. 1053-1095 
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 58 (1993), S. 445-451 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we compute the branching ratios of the tau decays into three mesons. The hadronic matrix elements are obtained by first using the structure of the chiral currents and that of the Wess-Zumino anomaly and finally implementing all possible low-lying resonances in the different channels.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of colorectal disease 7 (1992), S. 192-196 
    ISSN: 1432-1262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Entre 1985 et 1992 46 patients avec un cancer épidermoide du canal anal ont été traités prospectivement par un protocole d'irradiation combiné à une chimiothérapie par 5-Fluorouracil et Mitomycin C. Le taux de survie, le taux de survie NED et le taux de contrôle local des tumeurs était de 84%, 71% et 83% à 5 ans. La fonction ano-rectale a été préservée chez 33 des 41 patients (80%). Nous avons observé une toxicité aigue sévère comprenant 3 décés mais une très faible morbidité ultérieure. Le seul facteur pronostic significatif (P=0.06) de contrôle local de la tumeur était le stade T. La survie NED était significativement affectée (P=0.02) par la réduction de la chimiothérapie durant la deuxième cure.
    Notes: Abstract Between 1985 and 1992, 46 patients with epidermoid carcinoma of the anal canal were treated prospectively by a protocol of combined radiation and chemotherapy with 5-Fluorouracil and Mitomycin C. The survival rate, NED-survival rate and local tumour control rate were 84%, 71% and 83% at 5 years. Anorectal function was retained in 33 of 41 patients (80%). We observed severe acute toxicity including three deaths, but very little late morbidity. The only marginally significant prognostic factor (P=0.06) for local tumour control was T-stage. NED-survival was significantly affected (P=0.02) by reduction of chemotherapy during the second course.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1335
    Keywords: Oncogene ; c-erbB2 expression ; Breast cancer ; Prognosis ; Proliferation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary On the prognostic value of c-erbB2-encoded protein p185 in breast cancer there are controversal opinions. With the outlook of an evaluation of the prognostic value of p185 expression in breast cancer the relationships between p185 expression and known prognosis factors were investigated. Using polyclonal antibody against p185 33% out of 163 primary breast carcinomas are p185-positive. Within the various histological types of tumors the percentage of p185 expression differs. It is suggested that p185 indicates a certain type of biological behavior and plays a role in the pathogenesis of breast cancer. Thus the determination of p185 could allow definition of biological subclasses. A statistically significant correlation between expression of p185 and the presence of lymph node metastases or tumor size can not be proved. Nevertheless p185 expression is increased in cases with more than three positive lymph nodes. Expression of p185 correlates statistically significantly positively with histological grade and epidermal growth factor receptor, and negatively with steroid receptor status. Furthermore, high-proliferating tumors are more common in p185-positive cases than in p185-negative cases. It is concluded that p185 may be associated with an increased malignancy and proliferation activity of tumors.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1433-7339
    Keywords: Nutritional therapy ; PEG ; Quality of life ; Cancer patients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Between April 1987 and May 1990 a total of 212 consecutive patients with tumours in the head and neck region were admitted to a prospective study comparing planned prospective enteral nutrition via percutaneous endoscopically guided gastrostomy (PEG; n=47) and oral nutrition (n=134). The nutritional status (anthropometric and laboratory chemical parameters) and the quality-of-life index according to Padilla et al. [Res Nurs Health 6: 117–126 (1983)] were determined prior to radiotherapy, 2, 4, 6 weeks later during radiotherapy and 6, 12 and 18 weeks after completion of radiotherapy. The quality-of-life score of the orally nourished patients decreased quickly during radiotherapy and improved only slowly afterwards. Although PEG patients had a worse starting score, their quality-of-life index did not deteriorate during therapy (statistically significant difference between the two groups). The same applies to the nutritional status. These results show that an early and constant enteral nutrition by PEG can stabilize the nutritional state and the quality of life of patients with tumours of the head and neck area during radiotherapy.
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