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  • 1
    Electronic Resource
    Electronic Resource
    Success from a virtual structure (1999)
    [s.l.] : Nature America Inc.
    Nature biotechnology 17 (1999), S. 37-38 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] A virtual organization coordinating the resources of 170 companies and research institutes is providing a dramatic push forward for German ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/9110
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  • 2
    Electronic Resource
    Electronic Resource
    Is it efficient to analyse efficiency rankings? (2000)
    Springer
    Empirical economics 25 (2000), S. 189-208 
    Details
    ISSN: 1435-8921
    Keywords: Key words: Bootstrap, confidence intervals, frontiers, inefficiency, membership function, ranking ; JEL classification: C2, C4, C6, J3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract. When production functions are estimated as frontier functions, the deviations from the frontier can be interpreted as individual inefficiency estimates. Unfortunately, it has recently been shown that efficiency differences across individuals are very often statistically insignificant. In this paper, we will analyse the consequences of the consideration of confidence statements for the reliability of efficiency rankings. The stochastic frontier and confidence intervals derived by Horrace and Schmidt are compared to the COLS approach and bootstrap confidence intervals. The membership function is proposed as a simple Monte-Carlo approximation for the probability for an individual to be the most efficient in the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001819900013
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  • 3
    Electronic Resource
    Electronic Resource
    A method for isolation of cDNA-quality mRNA from immature seeds of a gymnosperm rich in polyphenolics (1993)
    Springer
    Plant molecular biology 22 (1993), S. 555-556 
    Details
    ISSN: 1573-5028
    Keywords: polyphenolics ; secondary metabolites ; lignified tissues ; cDNA cloning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015986
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The matched queueing network PH/M/c→oPH/PH/1 (1993)
    Springer
    Queueing systems 13 (1993), S. 315-333 
    Details
    ISSN: 1572-9443
    Keywords: Matched queueing network ; Markov process ; PH-renewal process ; PH-distribution ; state probability ; virtual waiting time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We consider a matched queueing network PH/M/c→oPH/PH/1, where the output of the first subsystem PH/M/c is regarded as one of the inputs of the second subsystem and matched with another input of PH-renewal process, and they are served by a single server with PH-service-distribution. The stationary state probabilities, the distribution of the virtual waiting times in the two subsystems, and the distribution of the total virtual waiting time are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01149259
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  • 5
    Electronic Resource
    Electronic Resource
    Bivariate lifetime distributions and optimal replacement (1996)
    Springer
    Mathematical methods of operations research 44 (1996), S. 31-47 
    Details
    ISSN: 1432-5217
    Keywords: Reliability ; optimal stopping ; martingale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The assumption that components which are part of a technical system work independently seems not appropriate in a number of applications. A lot of multivariate extensions of the univariate exponential distribution have been suggested as lifetime distributions. But only the models of J. E. Freund and of A. W. Marshall and I. Olkin seem to be physically motivated. A combination of these approaches yields a bivariate lifetime distribution which is investigated in some detail. Applications of this bivariate lifetime model are considered in preventive maintenance. In a two-component parallel system the optimal replacement time shall be determined with respect to the total expected discounted cost criterion. Results of the theory of stochastic processes are used to obtain the optimal strategy for different information levels. Some numerical examples based on a two-component parallel system with dependent component lifetimes show how the optimal replacement policy depends on the different information levels and on the degree of dependence of the components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246328
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  • 6
    Electronic Resource
    Electronic Resource
    Editor's preface (1997)
    Springer
    Mathematical methods of operations research 45 (1997), S. 309-310 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194781
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  • 7
    Electronic Resource
    Electronic Resource
    Asymptotic distribution of the downtime of a monotone system (1997)
    Springer
    Mathematical methods of operations research 45 (1997), S. 355-375 
    Details
    ISSN: 1432-5217
    Keywords: Downtime Distribution ; Monotone System with Repairable Components ; Compound Poisson Approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract To compute the distribution of the downtime in a time interval [0,t] for a highly available monotone system, a Compound Poisson process (CP(t)) approximation is often used. In this paper we give sufficient conditions for when the distribution ofCP(t) is an asymptotic limit. We also study the convergence to the normal distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194785
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  • 8
    Electronic Resource
    Electronic Resource
    Chloroplast DNA restriction site polymorphism inGenisteae (Leguminosae) suggests a common origin for European and American lupines (1994)
    Springer
    Plant systematics and evolution 193 (1994), S. 95-106 
    Details
    ISSN: 1615-6110
    Keywords: Genisteae ; Molecular phylogeny ; legumes ; biogeography ; disjunction ; chloroplast DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Restriction site polymorphism in cpDNA of 35 legumes was studied in order to address natural relationships and geographic distribution within the tribeGenisteae. 386 sites were studied, 277 were polymorphic, 207 were informative. Phylogenetic inferences with distance and parsimony methods suggest that the American and MediterraneanLupinus species belong to a monophyletic group which arose from a single center of diversification. The data furthermore indicate thatLupinus should not be included in the tribeGenisteae since at the level of cpDNA polymorphismAnagyris foetida (tribeThermopsideae) appears more closely related to otherGenisteae thanLupinus does.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983543
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  • 9
    Electronic Resource
    Electronic Resource
    Synopsis of progress for 1992–1993 in the DFG Schwerpunkt program “Molecular approaches in plant evolution” (1994)
    Springer
    Plant systematics and evolution 191 (1994), S. 127-130 
    Details
    ISSN: 1615-6110
    Keywords: Plant evolution ; molecular markers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985347
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  • 10
    Electronic Resource
    Electronic Resource
    Accumulation of seed storage proteins and the taxonomy ofPoaceae (1997)
    Springer
    Plant systematics and evolution 206 (1997), S. 243-257 
    Details
    ISSN: 1615-6110
    Keywords: Poaceae ; Seed storage proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The accumulation of specific seed proteins is a taxonomically valuable feature and can be used to additionally characterize plant taxa. To date, mainly crop proteins have been analysed in thePoaceae. In this investigation seed proteins from 147 species were screened with emphasis on legumin-like proteins and prolamins. The groups resulting from evaluation of the protein profiles correspond with well-known subfamilies and tribes.Panicoideae are clearly separated fromPooideae. WithinPooideae, theBromeae plusTriticeae tribes revealed obvious similarities.Lolium, Festuca andVulpia, generally included in the tribeFestuceae, revealed a protein profile similar to the profile of theBromeae/Triticeae. Legumin-like proteins are accumulated abundantly inBambusoideae andPooideae exceptBromeae/Triticeae, however, only the species included in theAveninae subtribe produce “soluble” (globulin-type) legumins as already known fromAvena sativa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987950
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