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  • 1995-1999  (82)
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  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 17 (1997), S. 0 
    ISSN: 1539-6924
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: EPA's Risk Assessment Guidance for Superfund (RAGS) and later documents provide guidance for estimating exposures received from suburban and agricultural activity patterns and lifestyles. However, these methods are not suitable for typical tribal communities whose members pursue, at least in part, traditional lifestyles. These lifestyles are derived from a long association with all of the resources in a particular region. We interviewed 35 members of a Columbia River Basin tribe to develop a lifestyle-based subsistence exposure scenario that represents a midrange exposure that a traditional tribal member would receive. This scenario provides a way to partially satisfy Executive Order 12898 on environmental justice, which requires a specific evaluation of impacts from federal actions to peoples with subsistence diets. Because a subsistence diet is only a portion of what is important to a traditional lifestyle, we also used information obtained from the interviews to identify parameters for evaluating impacts to environmental and sociocultural qualify of life.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 35 (1999), S. 0 
    ISSN: 1752-1688
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Notizen: : Two major challenges face today's water professionals. The first is finding solutions to increasingly complicated water resources problems. The second challenge is nontechnical. It is effective interaction with the public recognizing both the public's increasingly elevated goals relative to water and the public's growing understanding of water science and technology. The traditional DAD approach, that is, decide-announce-defend, is no longer appropriate. The much more progressive, and inclusive POP approach, that is, public owns project, is more likely to be effective given the changing nature of the public's expectations and knowledge. A water resources planning or design effort that fails to include a public interaction program plans to fail. Described in this paper are three suggested objectives of the POP approach, namely demonstrating awareness, gathering supplemental data and information, and building a base of support. Having established specific objectives for a particular water resources project, appropriate public interaction programs and events must be selected, scheduled, and implemented. Many and varied programs and events are described in the paper.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Bradford : Emerald
    Accounting, auditing & accountability journal 8 (1995), S. 23-47 
    ISSN: 0951-3574
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Wirtschaftswissenschaften
    Notizen: Senior management in the newly privatized water companies have beenkeen to secure employee commitment to the new commercial goals they arenow pursuing. Considers the use of profit sharing as a rhetorical devicefor this purpose. The introduction of profit sharing schemes wasintended by management not only to assist in the construction of a newversion of organizational reality, but more particularly to communicateto organizational members the quite different ideologicalconceptualization of organizational purposes and activities associatedwith the change in status from public sector water authority to privatesector water company. Reports research based on documentary evidence andinterviews with managers from six of the new water companies whichprovides scope for comparisons between the companies high-lightingdifferent interpretations of the role profit sharing may play in theprocesses of organizational change.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    ISSN: 1365-2427
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: 1. The impact of flash flooding on microbial distribution and biogeochemistry was investigated in the parafluvial zone (the part of the active channel lateral to the surface stream) of Sycamore Creek, a Sonoran Desert stream in central Arizona.2. It was hypothesized that subsurface bacteria were dependent on the import of algal-derived organic matter from the surface stream, and it was therefore predicted that microbial numbers and rates of microbially mediated processes would be highest at locations of surface to subsurface hydrologic exchange and at times when algal biomass was high.3. Prior to a flash flood on 19 July 1994, chlorophyll a was high (≈ 400 mg m–2) in the surface stream and microbial numbers were highest at the stream–parafluvial interface and declined along parafluvial flowpaths, supporting the hypothesized algal–bacterial linkage. Immediately following the flash flood, chlorophyll a was low (≈ 7 mg m–2), and microbial numbers were reduced at the stream–parafluvial interface.4. Counter to expectations, parafluvial functioning (in terms of nitrate production and dissolved oxygen decline along flowpaths) re-established immediately after the flood receded. Therefore, material other than algal exudates supported parafluvial metabolism immediately postflood, and terrestrially derived dissolved organic matter is the likely source.5. Algae in the surface stream recovered quickly following flooding, but recovery of parafluvial bacteria lagged somewhat behind. These results highlight the importance of surface–subsurface interaction to stream ecosystem functioning and show that the nature of these interactions changes substantially in successional time.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature medicine 2 (1996), S. 804-810 
    ISSN: 1546-170X
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] Testicular teratocarcinomas never contain p53 gene mutations even though these tumors express high levels of nuclear p53 protein. We have characterized two murine teratocarcinoma cell lines and find no evidence that endogenous p53–regulated genes are correspondingly upregulated. ...
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of mathematical biology 57 (1995), S. 619-630 
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Geometriae dedicata 69 (1998), S. 287-289 
    ISSN: 1572-9168
    Schlagwort(e): quaternion ; polytope ; line
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract An earlier computer calculation produced the vertices of a polytope in quaternionic 4-space, and determined their mutual angles all to be arccos (1/3). This note establishes a computer-independent verification.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Extremes 2 (1999), S. 5-23 
    ISSN: 1572-915X
    Schlagwort(e): generalized extreme value distribution ; maximum likelihood ; probability weighted moments ; small sample properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract Estimation of the extremal behavior of a process is often based on the fitting of asymptotic extreme value models to relatively short series of data. Maximum likelihood has emerged as a flexible and powerful modeling tool in such applications, but its performance with small samples has been shown to be poor relative to an alternative fitting procedure based on probability weighted moments. We argue here that the small-sample superiority of the probability weighted moments estimator is due to the assumption of a restricted parameter space, corresponding to finite population moments. To incorporate similar information in a likelihood-based analysis, we propose a penalized maximum likelihood estimator that retains the modeling flexibility and large-sample optimality of the maximum likelihood estimator, but improves on its small-sample properties. The properties of the penalized likelihood estimator are verified in a simulation study, and in application to sea-level data, which also enables the procedure to be evaluated in the context of structural models for extremes.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Minds and machines 5 (1995), S. 561-581 
    ISSN: 1572-8641
    Schlagwort(e): Cognitive unconscious ; discovery ; insight
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Philosophie
    Notizen: Abstract The Greeks had a ready answer for what happens when the mind suddenly finds the answer to a question for which it had been searching: insight was regarded as a gift of the Muses, its origins were ‘divine’. It served to highlight the Greeks' belief that there are some things which are not meant to be scientifically explained. The essence of insight is that it comes from some supernatural source: unpredicted and unfettered. In other words, the origins of insight are unconscious, and hence, unexplainable. Wittgenstein felt that, as long as there continues to be a noun expression like ‘to have a moment of insight’ which functions in the same way as the expression ‘to have a hunger pang’, thereby inducing us to treat ‘moment of insight’ as the name of an experience, then “people will keep stumbling over the same puzzling difficulties and find themselves staring at something which no explanation seems capable of clearing up.” To the founders of AI, this argument reeked of obscurantism. The moment of insight, they felt, is indeed a mystery, but it is one that begs to be explained in causal terms. Indeed, the problem of insight served as one of the leading problems in the evolution of AI. Hence anyone interested in the foundations of AI is compelled to examine the manner in which the early pioneers of the field sought to explain the ‘eureka experience’. In this paper I will look at some of the key conceptual developments which paved the way for Newell and Simon's theory of GPS: the fundamental changes in the notion of the unconscious — the emergence of the ‘cognitive unconscious’ — which took place in the nineteenth- and early twentieth-century. In so doing, I hope to clarify what Wittgenstein may have had in mind in his strictures against mechanist attempts to analyse the nature of insight.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Hydrobiologia 317 (1996), S. 183-188 
    ISSN: 1573-5117
    Schlagwort(e): dissolved organic carbon ; organic matter export ; desert streams
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Dissolved organic carbon (DOC) dynamics were examined over five years (1989–1993) in Sycamore Creek, a Sonoran Desert stream, specifically focusing on DOC concentration in surface and hyporheic waters, and rates of export. In 1989 and 1990, the years of lowest stream discharge (0.08 and 0.04 m3 s−1 annual mean of daily discharge, respectively), DOC was high, averaging 7.37 and 6.22 mgC l−1 (weighted annual means). In contrast, from 1991 through 1993, a period of increased flow (1.1, 1.2 and 4.3 m3 s−1), concentration was significantly lower (P〈0.001) with annual mean concentrations of 3.54, 3.49 and 3.39 mgC l−1. Concentration exhibited little spatial variation between two sampling stations located 6 km apart along the mainstem or between surface and hyporheic waters. Annual export of DOC from Sycamore Creek varied 100-fold over the five-year period from a mean rate of only 24 kgC d−1 in 1990 to 2100 kgC d−1 in 1993. Ninety percent of DOC was exported by flows greater than 2.8 m3 s−1, and 50% during flows greater than 27 m3 s−1; flows of 2.8 and 24 m3 s−1 occurred only 9 and 1% of the time. The export of organic matter in Sycamore Creek appears to be coupled to El Niño-Southern Oscillation phenomena. The years of highest export, 1991–1993, had El Niño conditions while 1989 and 1990 had medial conditions.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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