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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6667-6670 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed analysis of the photoinduced current transients of differently grown CdTe:Cl samples was performed in the 100–140 K range in order to investigate the influence of different growth techniques (sublimation, Bridgman method, and traveling heater method) on compensation defects. While studying the experimental results the analysis of the transients turned out to be a crucial point. With the conventional two-gate technique only one trap with misleading trap parameters could be identified in each sample. Analyzing the transients with the regularization method proposed recently [C. Eiche, D. Maier, M. Schneider, D. Sinerius, J. Weese, K. W. Benz, and J. Honerkamp, J. Phys. Condens. Matter 4, 6131 (1992)], three traps could be identified in each sample. Only one of these traps leads to an activation energy and a cross section approximately the same for the different samples. The other two traps of each sample depend on the growth technique.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 865-872 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In photon correlation spectroscopy, a time correlation function of the scattered light intensity is measured. Among other parameters, the relaxation time spectrum can be calculated from such measurement. This is usually done in two steps. First, the scattered field time correlation function is determined. In the second step, the relaxation time spectrum is calculated by solving a linear integral equation with Tikhonov regularization. With an adequate error model and a nonlinear regularization method, the analysis of photon correlation spectroscopy data can be improved considerably. We give a description of the improved method and illustrate its advantages.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 3851-3857 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There are several experimental methods which give information about the thermal relaxation times of the deep levels in a semiconductor. Analyzing the temperature dependence of the relaxation times, the activation energy and the cross section of the corresponding deep levels can be determined. An essential problem of such methods is the identification of the relaxation times in the measured signal. In the context of time-dependent measurements such as photoinduced current transient spectroscopy and deep level transient spectroscopy, Tikhonov regularization was recently proposed as a high resolution method for this purpose. In this contribution it is proposed to apply Tikhonov regularization in order to identify the thermal relaxation times in admittance spectroscopy data. The method is tested and discussed using simulated data. Finally, admittance spectroscopy data of a GaAs diode are analyzed. The results demonstrate that the resolution of an ordinary admittance spectroscopy setup can considerably be improved by the application of Tikhonov regularization. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that a recently proposed analysis of deep level transient spectroscopy signals with a regularization method by Batovski et al. [J. Appl. Phys. 74, 291 (1993)] can be simplified significantly by calculating the relaxation time spectrum of the capacitance transient with a regularization method directly.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 4372-4377 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Computer Physics Communications 77 (1993), S. 429-440 
    ISSN: 0010-4655
    Keywords: Tikhonov regularization ; ill-posed problem ; nonlinear integral equation ; nonlinear regularization
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Computer Physics Communications 69 (1992), S. 99-111 
    ISSN: 0010-4655
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food processing and preservation 26 (2003), S. 0 
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study evaluated seven existing watermelon rind pickle formulations (representing various soaking pretreatments including lime, brine and water) for their chemical, physical, sensory properties, safety, and suitability for industrial production. Titratable acidity (P = 0.0094), pH (P = 0.0042), color (P = 0.0153) and texture (P = 0.0373) were significantly different among various formulations; whereas, viscosity (P = 0.6603), total solids (P = 0.1175), and moisture (P = 0.2519) were not. Sensory data using a mixed gender consumer panel (n = 300, age range 18–65) indicated that overall, consumers preferred lime-soaked samples over brine or water pretreatments. Correlation existed between texture and crunchiness rating (r = 0.80). In addition, older consumers rated overall preference of watermelon rind pickles higher than younger adults (P = 0.0001). Six out of seven formulations used in this study are considered safe for industrial production with current processing times and temperatures (with pH below 4.0); however, one formulation with a final pH nearing 4.6 is considered not safe for current processing conditions.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1530-0358
    Keywords: Rectal cancer ; Radiotherapy ; Local excision ; Transanal excision
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: Little is known regarding the long-term outcome of patients with rectal cancer treated by local excision and radiation therapy. We updated our institutional experience with this approach. METHODS: From January 1986 to December 1991, 23 patients (median age, 64 (range, 30–80) years) with mobile, moderately differentiated adenocarcinoma of the rectum were offered transanal excision. Two patients with large T3 tumors, who were judged intraoperatively to be unsuited for a local procedure, received radical resection and were excluded from analysis. Twenty-one patients underwent transanal excision en bloc (14) or piecemeal (7) through a resectoscope. Seventeen patients (74 percent) had either extensive medical problems or refused a colostomy. Patients received a median of 5,040 cGy postoperatively, and 15 also received 500 cGy preoperatively on protocol. Two patients received concomitant chemotherapy. Median follow-up is 56 months for all patients and 67 months for survivors (range, 27–92 months). RESULTS: There were 2 T1, 15 T2, and 4 T3 tumors. The distance from the anal verge was a median of 4 (range, 1–7) cm. The median tumor size was 3 (range, 2–7) cm. Sixteen patients had more than one-third of the wall involved. Four patients (19 percent) developed a local recurrence at 26, 30, 33, and 48 (median, 31.5) months. Three were salvaged (abdominoperineal resection = 2; low anterior resection = 1) and remain disease-free 18, 36, and 37 months postoperatively. Four patients (19 percent) developed metastases (lung = 3; liver = 1) at 3, 22, 25, and 44 months after initial treatment (median, 23.5 months). The actuarial five-year overall, disease-free and recurrence-free survival are 77, 75, and 58 percent, respectively. Twelve patients (57 percent) have no evidence of disease while retaining their rectum. There was one postoperative death. CONCLUSIONS: Long-term follow-up confirms that local excision and radiation therapy is of value in patients with mobile tumors of the rectum. It suggests that this treatment can be offered to those patients who refuse a colostomy or are medically compromised and may be an acceptable option for selected patients with T2 or T3, mobile adenocarcinomas of the rectum.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1435-1528
    Keywords: Viscoelastic fluid ; relaxation spectrum ; retardation spectrum ; Tikhonov regularization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The application of Tikhonov regularization to the determination of relaxation and retardation spectra of viscoelastic fluids is discussed using simulated and real experimental data. It is thereby shown that with this method consistent results for relaxation and retardation spectra can be obtained from experimental data for different material functions. Furthermore, the differences between the most frequently used variants of Tikhonov regularization and the maximum entropy method are discussed. For most calculations the program FTIKREG has been used, which is an especially fast and reliable implementation of Tikhonov's regularization method.
    Type of Medium: Electronic Resource
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