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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 5 (1986), S. 463-484 
    ISSN: 1572-9338
    Keywords: Branch and bound design ; tree enumeration strategies ; discrete nonlinear programs ; nonlinear integer test problems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper is concerned with computational experimentation leading to the design of effective branch and bound algorithms for an important class of nonlinear integer programming problems, namely linearly constrained problems, which are used to model several real-world situations. The main contribution here is a study of the effect of node and branching variable selection and storage reduction strategies on overall computational effort for this class of problems, as well as the generation of a set of adequate test problems. Several node and branching variable strategies are compared in the context of a pure breadth-first enumeration, as well as in a special breadth and depth enumeration combination approach presented herein. Also, the effect of using updated pseudocosts is briefly addressed. Computational experience is presented on a set of eighteen suitably-sized nonlinear test problems, as well as on some random linear integer programs. Some of the new rules proposed are demonstrated to be significantly superior to previously suggested strategies; interestingly, even for linear integer programming problems.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 29 (1973), S. 859-861 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Nachweis, dass i.p.-Injektion von Urethan und Ganzkörper-Röntgenbestrahlungen bei Ratten eine potenzierte leukämogene Wirkung hat, während die Zahl der entstandenen Haut- und Mamma-Tumoren geringer war als bei der Einzelbehandlung.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 687-688 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Nach Injektion von Jod-Desoxyuridin bei Ratten hat die letale Wirkung von Ganzkörper-Röntgenbestrahlungen zugenommen ohne die Anzahl der entstandenen Tumoren zu vermehren.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 57 (1970), S. 248-249 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 57 (1970), S. 310-310 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Radiation and environmental biophysics 26 (1987), S. 263-273 
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Comparative effects of decay of DNA-bound125I, ofγ-radiation and of tritiated water on survival of the proliferative ability of cultured cells were examined. The results confirm a previous report that cells frozen to -196° C in the presence of 2M glycerol have lost a considerable proportion of their intracellular water. The data also suggest that the fraction of the lethal damage caused by deposition of radiation energy in intracellular water close to the DNA is greater forγ-radiation than for the decay of DNA-bound125I. Inherited differences in the sensitivity of untransformed fibroblasts from individual humans to ionizing radiations and other DNA-damaging agents are being explored. The ratios of the sensitivities of various cell lines to particular agents can vary several-fold. Thus the RBE of various radiations is affected not only by the irradiation conditions and the water content of the cells but also by inherited abnormalities in the DNA repair systems in human cells.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 46 (1994), S. 209-213 
    ISSN: 1432-1041
    Keywords: Insomnia ; Temazepam ; elderly ; efficacy ; tolerance ; intermittent administration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Temazepam, 7.5 mg was evaluated in the sleep laboratory in 8 elderly insomniacs, using a 14-night protocol (4 placebo-baseline nights, 7 drug nights, and 3 placebo-withdrawal nights). With short-term use temazepam was found to be effective, producing a significant improvement in total wake time from baseline (100 vs. 145 min). With continued drug administration, total wake time remained below baseline but not significantly so (125 vs. 145 min). During drug administration, there were no major CNS and behavioral adverse effects reported such as daytime sedation, memory impairment or hyperexcitability (daytime anxiety). Following drug withdrawal, there was no significant increase in wakefulness, i.e., no rebound insomnia (150 vs. 145 min). In summary, temazepam, 7.5 mg is effective in elderly subjects with short-term use and has a minimum of adverse effects. Use of hypnotic drugs is an adjunctive therapy which should be for a short-term period with subsequent short-term intermittent use as needed. Because of its low propensity for producing rebound insomnia, temazepam can be effectively used in this manner.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical geology 21 (1989), S. 347-362 
    ISSN: 1573-8868
    Keywords: stationarity ; second-order stationarity ; variograms ; generalized covariances ; drift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Stationarity in one form or another is an essential characteristic of the random function in the practice of geostatistics. Unfortunately it is a term that is both misunderstood and misused. While this presentation will not lay to rest all ambiguities or disagreements, it provides an overview and attempts to set a standard terminology so that all practitioners may communicate from a common basis. The importance of stationarity is reviewed and examples are given to illustrate the distinctions between the different forms of stationarity.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical geology 22 (1990), S. 107-121 
    ISSN: 1573-8868
    Keywords: Variogram ; geostatistics ; sample support ; variance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The effect of sample support size on variance is examined and evaluated. Results based on variograms and geostatistics are compared to the classical relationship developed by H. F. Smith in 1938; that is, that the variance is reduced fromV 1 toV 1 /n b as the support area increases from I ton plots for uniformity trials. The exponentb is between zero and one. Theoretical results are based on use of auxiliary functions and account for the size and shape of the sample support and the overall field geometry. Results are given in terms of approximations by rational functions for ease of calculation. Experimental results for uniformity trials, infiltration measurements, and spectral data from satellites are compared to theoretical and empirical results. Applications include not only uniformity trials, but also measurement theory.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical geology 31 (1999), S. 85-103 
    ISSN: 1573-8868
    Keywords: dispersion covariances ; Pearson correlation ; multivariate geostatistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract This paper extends the concept of dispersion variance to the multivariate case where the change of support affects dispersion covariances and the matrix of correlation between attributes. This leads to a concept of correlation between attributes as a function of sample supports and size of the physical domain. Decomposition of dispersion covariances into the spatial scales of variability provides a tool for computing the contribution to variability from different spatial components. Coregionalized dispersion covariances and elementary dispersion variances are defined for each multivariate spatial scale of variability. This allows the computation of dispersion covariances and correlation between attributes without integrating the cross-variograms. A correlation matrix, for a second-order stationary field with point support and infinite domain, converges toward constant correlation coefficients. The regionalized correlation coefficients for each spatial scale of variability, and the cases where the intrinsic correlation hypothesis holds are found independent of support and size of domain. This approach opens possibilities for multivariate geostatistics with data taken at different support. Two numerical examples from soil textural data demonstrate the change of correlation matrix with the size of the domain. In general, correlation between attributes is extended from the classic Pearson correlation coefficient based on independent samples to a most general approach for dependent samples taken with different support in a limited domain.
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