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  • 1
    Monograph available for loan
    Monograph available for loan
    Jahrbuch Ökologie 1998 (1997)
    München : Beck
    Associated volumes
    Details Availability
    Call number: PIK N 531-97-0341
    In: Jahrbuch Ökologie
    Type of Medium: Monograph available for loan
    Pages: 287 S.
    ISBN: 3406420281
    Series Statement: Jahrbuch Ökologie 1228
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    Second harmonic generation from beta barium borate (β-BaB2O4) thin films grown by metalorganic chemical vapor deposition (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 565-567 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of beta barium borate (β-BaB2O4) have been deposited by metalorganic chemical vapor deposition on fused silica, sapphire, platinum, and silicon substrates. Deposition conditions were optimized to reproducibly grow films with the c axis normal to the substrate. Second harmonic generation measurements have been made on selected films. The films grown on fused silica exhibit a maximum χeff(2) of 0.78 pm/V, and on single-crystal sapphire, 1.6 pm/V. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118209
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  • 3
    Electronic Resource
    Electronic Resource
    Tourism education: policy versus practice (1997)
    Bingley : Emerald
    International journal of contemporary hospitality management 9 (1997), S. 5-12 
    Details
    ISSN: 0959-6119
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Discusses the current human resources environment in tourism at a strategic policy level, especially in the area of management level education. Describes a framework which is being used to study consultation between the makers of tourism and education policy at a national level. The framework advocates the development and implementation of a specific tourism education policy, to bring tourism education closer in line with national tourism policies. Concludes by outlining further research strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09596119710157531
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  • 4
    Electronic Resource
    Electronic Resource
    Policy dimensions of human resource management in the tourism and hospitality industries (1997)
    Bingley : Emerald
    International journal of contemporary hospitality management 9 (1997), S. 221-229 
    Details
    ISSN: 0959-6119
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Develops the view that human resource management is a central strategic and operational concern within the tourism and hospitality industries, with implications for quality and market positioning of tourism at local, regional and national levels. Suggests that all stakeholders, be they public or private sector, visitor or host community, would benefit from a close integration of human resource, labour market and education policies. Presents two studies which substantiate this view: one which generally examines policies for human resource development, and another which addresses the policy issues involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09596119710172615
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  • 5
    Electronic Resource
    Electronic Resource
    A direct image of the obscuring disk surrounding an active galactic nucleus (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 852-854 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Active galactic nuclei (AGN) are generally accepted to be powered by the release of gravitational energy in a compact accretion disk surrounding a massive black hole,; such disks are also thought necessary to collimate the powerful radio jets seen in some AGN. The unifying classification ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388852a0
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  • 6
    Electronic Resource
    Electronic Resource
    Methods for packet combining in HARQ systems over bursty channels (1997)
    Springer
    Mobile networks and applications 2 (1997), S. 213-224 
    Details
    ISSN: 1572-8153
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The performance of ARQ systems can be improved by combining current and prior transmissions at the receiver. Two techniques for combining outputs in a packet-based communication system are presented. In both techniques the fundamental unit of retransmission is a packet, and the fundamental unit of combining is a codeword. The techniques are analyzed for a bursty channel and a system that employs Reed–Solomon coding and bounded-distance errors-and-erasures decoding. Performance results show that the packet-combining schemes provide significant gains in throughput and reductions in error probability when compared with a system that does not employ combining.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1013632716967
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  • 7
    Electronic Resource
    Electronic Resource
    Parallel Spinors and Holonomy Groups on Pseudo-Riemannian Spin Manifolds (1999)
    Springer
    Annals of global analysis and geometry 17 (1999), S. 1-17 
    Details
    ISSN: 1572-9060
    Keywords: holonomy groups ; parallel spinors ; pseudo-Riemannian manifolds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We describe the possible holonomy groups of simply connected irreducible non-locally symmetric pseudo-Riemannian spin manifolds which admit parallel spinors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006556630988
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  • 8
    Electronic Resource
    Electronic Resource
    A Direct Image of the Inner Torus of NGC 1068 (1997)
    Springer
    Astrophysics and space science 248 (1997), S. 253-260 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first VLBI observations of the compact source S1 in the radio jet of NGC 1068. Roughly 1 pc in length and 0.2 pc wide, S1 resolves into clumps aligned perpendicular to the local radio jet axis. The radio continuum emission arises from a hot (Te ~ 106 K), dense (ne ~ 106 cm-3) plasma, and the source of the radio emission is either thermal free-free emission or Thomson-reflected synchrotron emission. The clouds comprising S1 are opaque to soft X-radiation, and we therefore propose that S1 is the inner, ionized region, or ‘hot zone,’ of the obscuring medium surrounding the active nucleus. The covering fraction of the hot zone is small, Cf ⋦ 10%. Since the covering fraction of the dusty, obscuring medium is probably much larger, the obscuring disk must either flare or warp outside of the hot zone. That the radio jet and hot zone axes are perpendicular also suggests that the hot zone may be considered to trace the outermost extent of the accretion disk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000502300844
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  • 9
    Electronic Resource
    Electronic Resource
    The Ringberg Standards for NGC 1068 (1997)
    Springer
    Astrophysics and space science 248 (1997), S. 9-19 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the end of three days' spirited discussion of the type 2 Seyfert galaxy NGC 1068, what do we think we understand about this object? New observations -- particularly in the infrared and radio -- are helping to resolve old problems, while drawing attention to new ones. It appears that NGC 1068 is a relatively normal spiral galaxy in which large-scale gravitational disturbances are funneling matter into the nucleus. A collimated outflow disturbs the interstellar medium out to kiloparsec scales, but the nucleus itself is hidden behind an opaque screen. Radio observations have now pierced the screen, and suggest that at the center of it all, a 10-20 million solar mass black hole is accreting at close to its Eddington limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000567831370
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  • 10
    Electronic Resource
    Electronic Resource
    Toward a Model of Intelligence as an Economy of Agents (1999)
    Springer
    Machine learning 35 (1999), S. 155-185 
    Details
    ISSN: 0885-6125
    Keywords: reinforcement learning ; multi-agent systems ; planning ; evolutionary economics ; tragedy of the commons ; classifier systems ; agoric systems ; autonomous programming ; cognition ; artificial intelligence ; Hayek ; complex adaptive systems ; temporal difference learning ; evolutionary computation ; economic models of mind ; economic models of computation ; Blocks World ; reasoning ; learning ; computational learning theory ; learning to reason ; meta-reasoning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A market-based algorithm is presented which autonomously apportions complex tasks to multiple cooperating agents giving each agent the motivation of improving performance of the whole system. A specific model, called “The Hayek Machine” is proposed and tested on a simulated Blocks World (BW) planning problem. Hayek learns to solve more complex BW problems than any previous learning algorithm. Given intermediate reward and simple features, it has learned to efficiently solve arbitrary BW problems. The Hayek Machine can also be seen as a model of evolutionary economics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007593124513
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