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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Agriculture and human values 17 (2000), S. 125-139 
    ISSN: 1572-8366
    Schlagwort(e): Environment ; Fisheries ; Fordism ; Nation-State ; Regulation ; Supranational State ; Transnational corporations ; Transnational State
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract This analysis uses an analytical frameworkgrounded in political economy perspectives of theglobalization of the agro-food sector combined with acase study approach focusing on the Marine StewardshipCouncil (MSC) to inform discussions regarding thecharacteristics of societal regulation in thepost-Fordist era. More specifically, this analysisuses the case of the emergence of the MSC toinvestigate propositions regarding the existence of,and location of, nascent forms of a transnationalState. The MSC proposes to regulate the certificationof sustainable fisheries at the global level throughan eco-labeling program. The MSC was created in 1996by the transnational environmental organization theWorld Wildlife Fund and the transnational corporationUnilever. The emergence of the MSC has generatedheated discussion in fisheries management circles thatis in general divided along North/South lines. Thisanalysis indicates that the case of the MSC providesvaluable insights into the possible characteristics ofsupranational regulatory mechanisms that might emulatethe role of the nation-State in the post-Fordist era.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Environment, development and sustainability 2 (2000), S. 277-304 
    ISSN: 1573-2975
    Schlagwort(e): Systems of Knowledge ; Local Knowledge ; Fisheries ; Resource Management
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Sociologie
    Notizen: Abstract During the last 20 years, the existence of rich systems of local knowledge, and their vital support to resource use and management regimes, has been demonstrated in a wide range of biological, physical and geographical domains, such as agriculture, animal husbandry, forestry and agroforestry, medicine, and marine science and fisheries. Local knowledge includes empirical and practical components that are fundamental to sustainable resource management. Among coastal-marine fishers, for example, regular catches and, often, long-term resource sustainment are ensured through the application of knowledge that encompasses empirical information on fish behaviour, marine physical environments, fish habitats and the interactions among ecosystem components, as well as complex fish taxonomies. Local knowledge is therefore an important cultural resource that guides and sustains the operation of customary management systems. The sets of rules that compose a fisheries management system derive directly from local concepts and knowledge of the resources on which the fishery is based. Beyond the practical and the empirical, it is essential to recognise the fundamental socio-cultural importance of local knowledge to any society. It is through knowledge transmission and socialisation that worldviews are constructed, social institutions perpetuated, customary practices established, and social roles defined. In this manner, local knowledge and its transmission, shape society and culture, and culture and society shape knowledge. Local knowledge is of great potential practical value. It can provide an important information base for local resources management, especially in the tropics, where conventionally-used data are usually scarce to non-existent, as well as providing a shortcut to pinpoint essential scientific research needs. To be useful for resources management, however, it must be systematically collected and scientifically verified, before being blended with complementary information derived from Western-based sciences. But local knowledge should not be looked on with only a short-term utilitarian eye. Arguments widely accepted for conserving biodiversity, for example, are also applicable to the intellectual cultural diversity encompassed in local knowledge systems: they should be conserved because their utility may only be revealed at some later date or owing to their intrinsic value as part of the world's global heritage. At least in cultures with a Western liberal tradition, more than lip-service is now being paid to alternative systems of knowledge. The denigration of alternative knowledge systems as backward, inefficient, inferior, and founded on myth and ignorance has recently begun to change. Many such practices are a logical, sophisticated and often still-evolving adaptation to risk, based on generations of empirical experience and arranged according to principles, philosophies and institutions that are radically different from those prevailing in Western scientific circles, and hence all-but incomprehensible to them. But steadfastly held prejudices remain powerful. In this presentation I describe the 'design principles' of local knowledge systems, with particular reference to coastal-marine fishing communities, and their social and practical usefulness. I then examine the economic, ideological and institutional factors that combine to perpetuate the marginalisation and neglect of local knowledge, and discuss some of the requirements for applying local knowledge in modern management.
    Materialart: Digitale Medien
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2000-06-08
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Normile, D -- New York, N.Y. -- Science. 2000 May 19;288(5469):1165.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10841732" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Academies and Institutes/economics ; Animals ; Astronomical Phenomena ; Astronomy ; Chloroplasts/genetics ; Drosophila/genetics ; Interferometry ; *Molecular Biology/economics ; Physical Phenomena ; Physics ; *Research/economics ; Research Support as Topic ; Taiwan
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2000-08-19
    Beschreibung: At a press conference on 27 July, the National Marine Fisheries Service (NMFS) released a long-awaited plan to save the Columbia River's endangered salmon by restoring fish habitat, overhauling hatcheries, limiting harvest, and improving river flow. What the plan did not do, however, was call for immediate breaching of four dams on the Snake River, the Columbia's major tributary--an option that has been the subject of a nationwide environmental crusade. The NMFS will hold that option in abeyance while it sees whether the less drastic measures will do the trick. Responses from both sides were immediate and outraged.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mann, C C -- Plummer, M L -- New York, N.Y. -- Science. 2000 Aug 4;289(5480):716-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10950712" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Conservation of Natural Resources ; *Ecosystem ; Fisheries ; Fresh Water ; Government Agencies ; Northwestern United States ; *Salmon
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 5
    Publikationsdatum: 2000-10-29
    Beschreibung: The effects of climate variability on Pacific salmon abundance are uncertain because historical records are short and are complicated by commercial harvesting and habitat alteration. We use lake sediment records of delta15N and biological indicators to reconstruct sockeye salmon abundance in the Bristol Bay and Kodiak Island regions of Alaska over the past 300 years. Marked shifts in populations occurred over decades during this period, and some pronounced changes appear to be related to climatic change. Variations in salmon returns due to climate or harvesting can have strong impacts on sockeye nursery lake productivity in systems where adult salmon carcasses are important nutrient sources.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finney, B P -- Gregory-Eaves, I -- Sweetman, J -- Douglas, M S -- Smol, J P -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):795-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Marine Science, University of Alaska Fairbanks, Fairbanks, AK 99775, USA. finney@ims.uaf.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11052941" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alaska ; Animals ; *Climate ; Diatoms ; *Ecosystem ; Fisheries ; Fresh Water ; Geologic Sediments/chemistry ; Industry ; Nitrogen Isotopes/analysis ; Pacific Ocean ; Plankton ; Salmon/*physiology ; Temperature
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2000-08-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Muro, M -- New York, N.Y. -- Science. 2000 Jul 14;289(5477):228.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10917838" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Arizona ; Astronomical Phenomena ; Astronomy ; Conservation of Natural Resources ; Population Dynamics ; *Sciuridae
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2000-01-15
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1999 Dec 17;286(5448):2239-43.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10636773" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Astronomical Phenomena ; Astronomy ; Eukaryotic Cells ; Genome ; Memory ; Nuclear Physics ; Photons ; *Research ; Ribosomes/chemistry/ultrastructure ; Sequence Analysis, DNA
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2000-05-08
    Beschreibung: Fish faunas across the continental United States have become more similar through time because of widespread introductions of a group of cosmopolitan species intended to enhance food and sport fisheries. On average, pairs of states have 15.4 more species in common now than before European settlement of North America. The 89 pairs of states that formerly had no species in common now share an average of 25.2 species. Introductions have played a larger role than extirpations in homogenizing fish faunas. Western and New England states have received the most introductions, which is a reflection of the small number of native fishes in these areas considered desirable gamefish by settlers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rahel, F J -- New York, N.Y. -- Science. 2000 May 5;288(5467):854-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071, USA. frahel@uwyo.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10797007" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Ecosystem ; Fisheries ; *Fishes ; Species Specificity ; United States
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
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  • 9
    Publikationsdatum: 2009-11-16
    Beschreibung: We present results of new ASCA observations of the low-luminosity AGN (LLAGN) NGC 4579 obtained in 1998 December 18 and 28, and we report on detection of variability of an iron K emission line. The X-ray luminosities in the 2-10 keV band for the two observations are nearly identical, L(sub X) approximately = 2 x 10(exp 4l) ergs/s, but they are approximately 35% larger than that measured in 1995 July by Terashima et al. (1998). An Fe K emission line is detected at 6.39 +/- 0.09 keV (source rest frame) which is lower than the line energy 6.73(sup +0.13, sub -0.12) keV in the 1995 observation. If we fit the Fe lines with a blend of two Gaussians centered at 6.4 keV and 6.73 KeV, the intensity of the 6.7 keV line decreased, while the intensity of the 6.4 keV line increased, within an interval of 3.5 years. This variability rules out thermal plasmas in the host galaxy as the origin of the ionized Fe line in this LLAGN. The detection and variability of the 6.4 keV line suggest that an optically thick standard accretion disk is present and subtends a large solid angle viewed from the nucleus at the Eddington ratio of L(sub Bol)/L(sub Eddington) approximately 2 x 10(exp -3) (Ho 1999). A broad disk-line profile is not clearly seen and the structure of the innermost part of accretion disk remains unclear.
    Schlagwort(e): Astronomy
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  • 10
    Publikationsdatum: 2011-08-23
    Beschreibung: We present X-ray emission-line equivalent width images of the bright Galactic supernova remnant Cassiopeia A for the elements Si, S, Ar, Ca, and Fe using a 50,000 s observation with the Advanced CCD Imaging Spectrometer on the Chandra X-Ray Observatory. The images essentially map the bulk of detectable ejecta of these elements over a wide range of surface brightnesses and show morphologies distinctly different from that of the broadband X-ray emission and the 4-6 keV continuum emission. The Si, S, Ar, and Ca maps, while different in turn from those of Fe, are similar to the distribution of fast optical ejecta knots in that they clearly delineate the X-ray counterpart of the northeast optical jet. Low surface brightness regions just outside the bright shell in the north and west are also shown to have strong line emission. The strong Fe emission is exterior to that of other elements in the east, as previously noted, but is generally coincident elsewhere. The projected interior has relatively little emission traced by high line equivalent widths.
    Schlagwort(e): Astronomy
    Materialart: The Astrophysical Journal; Volume 537; L119-L122
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  • 11
    Publikationsdatum: 2011-08-23
    Beschreibung: The magnetic flux content of the Jovian magnetosphere is set by the internal dynamo, but those magnetic field lines are constantly being loaded by heavy ions at the orbit of lo and dragged inexorably outward by the centrifugal force. Vasyliunas has proposed a steady state reconnecting magnetospheric model that sheds plasma islands of zero net magnetic flux and returns nearly empty flux tubes to the inner magnetosphere. The Galileo observations indicate that beyond 40 Rj the current sheet begins to tear and beyond 50 Rj on the nightside explosively reconnects as the tearing site reaches the low density lobe region above and below the current sheet. Small events occur irregularly but on average about every 4 hours and large events about once a day. The magnetic flux reconnected in such events amounts up to about 70,000 Webers/sec and is sufficient to return the outwardly convected magnetic flux to the inner magnetosphere. Since this process releases plasmoids into the jovian tail, as do terrestrial substorms; since this process involves explosive reconnection across the current sheet on the nightside of the planet, as do terrestrial substorms; and since the process is a key in closing the circulation pattern of the magnetic and plasma flux, as it is in terrestrial substorms; we refer to these events as jovian substorms.
    Schlagwort(e): Astronomy
    Materialart: Advanced Space Research (ISSN 0273-1177); Volume 26; No. 10; 1499-1504
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  • 12
    Publikationsdatum: 2011-08-24
    Beschreibung: No abstract available
    Schlagwort(e): Astronomy
    Materialart: Stellar Astrophysics, Proceedings of the Pacific; 267
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  • 13
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    In:  CASI
    Publikationsdatum: 2013-08-31
    Beschreibung: The Space Interferometry Mission (SIM) is a space-based 10 m baseline Michelson interferometer. Planned for launch in 2005 aboard a Delta III launch vehicle, or equivalent, its primary objective is to measure the positions of stars and other celestial objects with an unprecedented accuracy of 4 micro arc seconds. With such an instrument, tremendous advancement can be expected in our understanding of stellar and galactic dynamics. Using triangulation from opposite sides of the orbit around the sun (i.e. by using parallax) one can measure the distance to any observable object in our galaxy. By directly measuring the orbital wobble of nearby stars, the mass and orbit of planets can be determined over a wide range of parameters. The distribution of velocity within nearby galaxies will be measurable. Observations of these and other objects will improve the calibration of distance estimators by more than an order of magnitude. This will permit a much better determination of the Hubble Constant as well as improving our overall understanding of the evolution of the universe. SIM has undergone several transformations, especially over the past year and a half since the start of Phase A. During this phase of a project, it is desirable to perform system-level trade studies, so the substantial evolution of the design that has occurred is quite appropriate. Part of the trade-off process has addressed two major underlying architectures: SIM Classic; and Son of SIM. The difference between these two architectures is related to the overall arrangement of the optical elements and the associated metrology system. Several different configurations have been developed for each architecture. Each configuration is the result of design choices that are influenced by many competing considerations. Some of the more important aspects will be discussed. The Space Interferometry Mission has some extremely challenging goals: millikelvin thermal stability, nanometer stabilization of optics, picometer measurement of wavefront, and others. In order to meet these goals, a significant amount of technological development is required. Although there has been a program operating for about a decade developing technologies specifically to address the challenges of space-based interferometry, there still remains a tremendous effort to achieve the incredible accuracy required of SIM. The projected viability of some of these areas has influenced design choices during the evolution of the many configurations that have been developed. For instance, the perceived complexity of the IR laser metrology system used to measure and control the positions of key optical elements was the strongest discriminator between the two architectures, and led to a decision to select SOS rather than Classic in early 1998. More recently, an appreciation of the sensitivity to beam-walk within the SOS architecture is forcing a reconsideration of that decision. At the time of submission of this abstract, there is some hope that a full-aperture metrology system may alleviate this issue. In addition to describing the current configuration of SIM, the influence of a few selected areas on the evolution of the configuration will be discussed.
    Schlagwort(e): Astronomy
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  • 14
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    In:  CASI
    Publikationsdatum: 2013-08-31
    Beschreibung: The Trans-Pacific Astronomy Experiment is Phase 2 of the Trans-Pacific High Data Rate Satcom Experiments following the Trans-Pacific High Definition Video Experiment. It is a part of the Global Information Infrastructure-Global Interoperability for Broadband Networks Project (GII-GIBN). Provides global information infrastructure involving broadband satellites and terrestrial networks and access to information by anyone, anywhere, at any time. Collaboration of government, industry, and academic organizations demonstrate the use of broadband satellite links in a global information infrastructure with emphasis on astronomical observations, collaborative discussions and distance learning.
    Schlagwort(e): Astronomy
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  • 15
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    In:  CASI
    Publikationsdatum: 2013-08-29
    Beschreibung: The Next Generation Space Telescope (NGST), planned for launch in 2009, will be an 8-m class radiatively cooled infrared telescope at the Lagrange point L2. It will cover the wavelength range from 0.6 to 28 microns with cameras and spectrometers, to observe the first luminous objects after the Big Bang, and the formation, growth, clustering, and evolution of galaxies, stars, and protoplanetary clouds, leading to better understanding of our own Origins. It will seek evidence of the cosmic dark matter through its gravitational effects. With an aperture three times greater than the Hubble Space Telescope, it will provide extraordinary advances in capabilities and enable the discovery of many new phenomena. It is a joint project of the NASA, ESA, and CSA, and scientific operations will be provided by the Space Telescope Science Institute.
    Schlagwort(e): Astronomy
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  • 16
    Publikationsdatum: 2013-08-29
    Beschreibung: We present RXTE monitoring observations of the Seyfert 2 galaxy Mrk 348 spanning a 6 month period. The time-averaged spectrum in the 3-20 keV band shows many features characteristic of a Compton-thin Seyfert 2 galaxy, namely a hard underlying power-law continuum (Gamma approximately equal 1.8) with heavy soft X-ray absorption (N(sub H) approximately 10(exp 23)/sq cm) plus measurable iron K.alpha emission (equivalent width approximately 100 eV) and, at high energy, evidence for a reflection component (R approximately 〈 1). During the first half of the monitoring period the X-ray continuum flux from Mrk 348 remained relatively steady. However this was followed by a significant brightening of the source (by roughly a factor of 4) with the fastest change corresponding to a doubling of its X-ray flux on a timescale of about 20 days. The flux increase was accompanied by a marked softening of X-ray spectrum most likely attributable to a factor approximately 3 decline in the intrinsic line-of-sight column density. In contrast the iron K.alpha line and the reflection components showed no evidence of variability. These observations suggest a scenario in which the central X-ray source is surrounded by a patchy distribution of absorbing material located within about a light-week of the nucleus of Mrk 348. The random movement of individual clouds within the absorbing screen, across our line of sight, produces substantial temporal variations in the measured column density on timescales of weeks to months and gives rise to the observed X-ray spectral variability. However, as viewed from the nucleus the global coverage and typical thickness of the cloud layer remains relatively constant.
    Schlagwort(e): Astronomy
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  • 17
    Publikationsdatum: 2013-08-29
    Beschreibung: As funding, for astronomy dwindles and the competition for observation time heats up, more astronomers may turn to balloons. Far above the Keck telescope on Hawaii's Mauna Kea, higher still than the hostile snowcapped peaks of Mt. Everest, there exists a 40-kilometer summit that will place their telescopes above 99% of the atmosphere. With the prospect of 100-day and even 1,000-day balloons, the climb to the summit is more and more tempting. Surely, given enough cash, most astronomers would opt for a lunar base or a platform beyond the Earth. Until then, many seem happy to settle for a stratospheric mountaintop.
    Schlagwort(e): Astronomy
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  • 18
    Publikationsdatum: 2013-08-29
    Beschreibung: The Next Generation Space Telescope (NGST) is a large aperture space telescope designated to succeed the Hubble Space Telescope (HST). NGST will continue the recent breakthroughs of HST in our understanding of the earliest origins of stars, galaxies and the elements that are the foundations of Life. It is expected that the costs of NGST should be kept within a fraction of those for HST. The ground segment has a goal of reducing the cost of NGST in comparison to HST by 50% to 75%. To mitigate risks for NGST a flight demonstrator called Nexus is planned for 2005. Nexus is a smaller scale telescope, which plans to test the deployment and optical stability of the telescope, the "Wave Front Control" process, and the thermal performance of the sunshield. The Nexus Ground System will be developed by GSFC and STSci, and the NGST Ground System will be developed by STSci. The authors of this paper are engaged in a study to evaluate and recommend selection of a Command and Telemetry system for each of these Ground Systems. This paper focuses on the process of selecting the real-time Command and Telemetry system for NGST. We would like to use the conference as a sounding board as we make a selection.
    Schlagwort(e): Astronomy
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  • 19
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    In:  CASI
    Publikationsdatum: 2012-10-23
    Beschreibung: Theoretically self-consistent calculations for photoionization and (e + ion) recombination are described. The same eigenfunction expansion for the ion is employed in coupled channel calculations for both processes, thus ensuring consistency between cross sections and rates. The theoretical treatment of (e + ion) recombination subsumes both the non-resonant recombination ("radiative recombination"), and the resonant recombination ("di-electronic recombination") processes in a unified scheme. In addition to the total, unified recombination rates, level-specific recombination rates and photoionization cross sections are obtained for a large number of atomic levels. Both relativistic Breit-Pauli, and non-relativistic LS coupling, calculations are carried out in the close coupling approximation using the R-matrix method. Although the calculations are computationally intensive, they yield nearly all photoionization and recombination parameters needed for astrophysical photoionization models with higher precision than hitherto possible, estimated at about 10-20% from comparison with experimentally available data (including experimentally derived DR rates). Results are electronically available for over 40 atoms and ions. Photoionization and recombination of He-, and Li-like C and Fe are described for X-ray modeling. The unified method yields total and complete (e+ion) recombination rate coefficients, that can not otherwise be obtained theoretically or experimentally.
    Schlagwort(e): Astronomy
    Materialart: Atomic Data Needs for X-ray Astronomy; 77-84; NASA/CP-2000-209968
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  • 20
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    In:  CASI
    Publikationsdatum: 2012-10-23
    Beschreibung: Recent advances in theoretical atomic physics have enabled large-scale calculation of atomic parameters for a variety of atomic processes with high degree of precision. The development and application of these methods is the aim of the Iron Project. At present the primary focus is on collisional processes for all ions of iron, Fe I - FeXXVI, and other iron-peak elements; new work on radiative processes has also been initiated. Varied applications of the Iron Project work to X-ray astronomy are discussed, and more general applications to other spectral ranges are pointed out. The IP work forms the basis for more specialized projects such as the RmaX Project, and the work on photoionization/recombination, and aims to provide a comprehensive and self-consistent set of accurate collisional and radiative cross sections, and transition probabilities, within the framework of relativistic close coupling formulation using the Breit-Pauli R-Matrix method. An illustrative example is presented of how the IP data may be utilized in the formation of X-ray spectra of the K alpha complex at 6.7 keV from He-like Fe XXV.
    Schlagwort(e): Astronomy
    Materialart: Atomic Data Needs for X-ray Astronomy; 69-75; NASA/CP-2000-209968
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  • 21
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    In:  CASI
    Publikationsdatum: 2012-10-23
    Beschreibung: The new x-ray astronomical observatories have sufficient spectroscopic capability to allow the determination of plasma conditions in the form of velocities, temperatures, densities, and turbulence parameters at levels that were previously unattainable. The utilization of these diagnostics are possible only if the atomic and plasma physics are well-enough understood to match the observational sensitivity.
    Schlagwort(e): Astronomy
    Materialart: Atomic Data Needs for X-ray Astronomy; 1-4; NASA/CP-2000-209968
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  • 22
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    In:  CASI
    Publikationsdatum: 2012-10-23
    Beschreibung: Physical properties such as temperature and electron density of solar plasma and other astrophysical objects can be inferred from EUV and X-ray emission lines observed from space. These lines are emitted when the higher states of an ion are excited by electron impact and then decay by photon emission. Excitation cross sections are required for the spectroscopic analyses of the observations and various approximations have been used to calculate the scattering functions. One of them which has been widely used is a distorted wave approximation. This approximation, along with its applications to solar observations, is discussed. The Bowen fluorescence mechanism and optical depth effects are also discussed. It is concluded that such calculations are reliable for highly charged ions and for high electron temperatures.
    Schlagwort(e): Astronomy
    Materialart: Atomic Data Needs for X-ray Astronomy; 41-63; NASA/CP-2000-209968
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  • 23
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    Publikationsdatum: 2012-10-23
    Beschreibung: Several different approximations and techniques have been developed for the calculation of atomic structure, ionization, and excitation of atoms and ions. These techniques have been used to compute large amounts of spectroscopic data of various levels of accuracy. This paper presents a review of these theoretical methods to help non-experts in atomic physics to better understand the qualities and limitations of various data sources and assess how reliable are spectral models based on those data.
    Schlagwort(e): Astronomy
    Materialart: Atomic Data Needs for X-ray Astronomy; 25-40; NASA/CP-2000-209968
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  • 24
    Publikationsdatum: 2013-08-31
    Beschreibung: The Next Generation Space Telescope (NGST), part of NASA's Origins program, is a follow on to the Hubble Space Telescope expected to provide timely new science along with answering fundamental questions. NGST is a large diameter, infrared optimized telescope with imaging and spectrographic detectors which will be used to help study the origin of galaxies. Due to the large data NGST will collect, Goddard Space Flight Center has considered the use of optical communications for data downlink. The Optical Communications Group at the Jet Propulsion Laboratory has performed a study on optical communications systems for NGST. The objective of the study was to evaluate the benefits gained through the use of optical communication technologies. Studies were performed for each of four proposed NGST orbits. The orbits considered were an elliptical orbit about the semi stable second Lagrangian point, a 1 by 3 AU elliptic orbit around the sun, a 1 AU drift orbit, and a 1 AU drift orbit at a 15 degree incline to the ecliptic plane. An appropriate optical communications system was determined for each orbit. Systems were evaluated in terms of mass, power consumption, size, and cost for each of the four proposed orbits.
    Schlagwort(e): Astronomy
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  • 25
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Bulletin of the American Astronomical Society
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  • 26
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Bulletin of the American Astronomical Society
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  • 27
    Publikationsdatum: 2018-06-11
    Beschreibung: Numerical simulations of the orbital evolution of dust particles from Edgeworth-Kuiper Belt (EKB) objects show that the three giant planets, Neptune, Jupiter, and Saturn impose distinct and dramatic signatures on the overall distribution of EKB dust particles. The features are very similar to those observed in the dust disk around the nearby star Eridani. Numerical simulations of dust particles in the epsilon Eridani system show that planetary perturbations may be responsible for the observed features
    Schlagwort(e): Astronomy
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  • 28
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    Publikationsdatum: 2018-06-08
    Beschreibung: Comparisons of measurements from interferometry, spectroscopy, precision photometry, lunar occultation, and Hipparcos not only checks the accuracy of the distance to the Hyades, but also provides an accurate empirical mass-luminosity relation, and a good estimate of the age of the Hyades.
    Schlagwort(e): Astronomy
    Materialart: The 195th Meeting of the American Astronomical Society; Atlanta, GA; United States
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  • 29
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 195th Meeting of the American Astronomical Society; Atlanta, GA; United States
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  • 30
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 195th Meeting of the American Astronomical Society; Atlanta, GA; United States
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  • 31
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: American Astronomical Society Meeting; Atlanta, GA; United States
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  • 32
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 195th American Astronomical Society; United States
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  • 33
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Astronomical Telescopes and Instrumentation AS04-Interferometry in Optical Astronomy; Munich; Germany
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  • 34
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 35
    Publikationsdatum: 2018-06-08
    Beschreibung: We present near-infrared images of the supernova remnant RCW 103 from the Two Micron All Sky Survey (2MASS).
    Schlagwort(e): Astronomy
    Materialart: Young Supernova Remnants; College Park, MD; United States
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  • 36
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Symposium Zoo The Formation of Binary Stars; Potsdam; Germany
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  • 37
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 197th Meeting of the American Astronomical Society; San Diego, CA; United States
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  • 38
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Astronomical Data Analysis Software & Systems X; Boston, MA; United States
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  • 39
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 40
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 41
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 197th Meeting of the American Astronomical Society; San Diego, CA; United States
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  • 42
    Publikationsdatum: 2018-06-08
    Beschreibung: We discuss the development of the Differential Phase detection technique for the Keck Interferometer Hot Jupiter Key Science Program.
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Symposium 202 : Planetary Systems in the Universe: Observation, Formation and Evolution; Manchester; United Kingdom
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  • 43
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 44
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    Publikationsdatum: 2018-06-08
    Beschreibung: Extensive observations of comet Hale-Bopp from the ground and space have considerably expanded our knowledge of cometary dust.
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Colloquium 181; Canterbury; United Kingdom|Proceedings of International Astronomical Union (IAU) Colloquium 181
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  • 45
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 46
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 47
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 48
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Astronomical Data Analysis Software and Systems X; Boston, MA; United States
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  • 49
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 50
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 51
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 52
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 53
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Bulletin of the American Astronomical Society
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  • 54
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 55
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 56
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Pasadena, CA; United States
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  • 57
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    Publikationsdatum: 2018-06-08
    Beschreibung: Radiative effects strongly hinder the formation of massive stars. A necessary condition for accretion growth of a hydrostatic object up to high masses is the formation of and accretion through a circumstellar disk.
    Schlagwort(e): Astronomy
    Materialart: Star Formation 2000; Ringberg; Germany
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  • 58
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    Publikationsdatum: 2018-06-08
    Beschreibung: Designed and developed within JPL/Caltech's supercomputing and visualization environment, the virtual observatory software described in this paper permits high performance visualization and analysis of large sky images and catalogs.
    Schlagwort(e): Astronomy
    Materialart: Virtual Observatories of the Future; Pasadena, CA; United States
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  • 59
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Publications of the Astronomical Society of the Pacific
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  • 60
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union 24th General Assembly; Manchester; United Kingdom
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  • 61
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union 24th General Assembly; Manchester; United Kingdom
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  • 62
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) XXIV General Assembly; Manchester; United Kingdom
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  • 63
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) General Assembly; Manchester; United Kingdom
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  • 64
    Publikationsdatum: 2018-06-08
    Beschreibung: Because the TiO and VO bands, which dominate the far-optical portions of late-M spectra, disappear in these cooler dwarfs, we define a new spectral class L in wich metallic oxides are replaced by metallic hydrides and neutral alkali metals as the major spectroscopic signatures.
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union; Manchester; United Kingdom
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  • 65
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: New Results in IR and Sub-mm Astronomy; Warsaw; Poland
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  • 66
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union; Manchester; United Kingdom
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  • 67
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Conference; Manchester; United Kingdom
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  • 68
    Publikationsdatum: 2018-06-08
    Beschreibung: In this study, we explore the link between the physical properties of the outflow as determined from optical imaging and spectroscopy, and compare these results with those obtained from observations in the near infrared.
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal
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  • 69
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: American Astronomical Society; Rochester, NY; United States
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  • 70
    Publikationsdatum: 2018-06-08
    Beschreibung: Observations of far-infrared emission lines can be used to infer the physical conditions of the ISM in galaxies.
    Schlagwort(e): Astronomy
    Materialart: American Astronomical Society Meeting; Rochester, NY; United States
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  • 71
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    Publikationsdatum: 2018-06-08
    Beschreibung: This article describes a fit of numerically integrated orbits for the eight outer Jovian satellites to Earth-based astrometric observations.
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal; Volume 120; no. 5; 2679-2686
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  • 72
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union; Manchester; United Kingdom
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  • 73
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU), Planetary Systems in the Universe Symposium; Manchester; United Kingdom
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  • 74
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    Publikationsdatum: 2018-06-08
    Beschreibung: We present the first ground-based U' ambda(central) = 3410 Angstrom, Delta(lambda) = 320 Angstrom) images of ultraluminous infrared galaxies (ULIGs).
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal; Volume 120; no. 2; 604-620
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  • 75
    Publikationsdatum: 2018-06-08
    Beschreibung: We present very long baseline interferometry (VLBI) images of the core emission from a nearby bright FR II radio galaxy, Pictor A, revealing its parsec-scale jet structure and evolution for the first time.
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal; Volume 119; no. 4; 1695-1700
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  • 76
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Physics and Astronomy; Northridge, CA; United States
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  • 77
    Publikationsdatum: 2018-06-08
    Beschreibung: We present a quantitative study of the far-ultraviolet (FUV) and optical morphology in 32 nearby galaxies and estimate the morphological k-correction expected if these objects were observed unevolved at high redshift.
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal
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  • 78
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Colloquium 181, Dust in the Solar System and Other Planetary Systems; Canterbury; United Kingdom
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  • 79
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    Publikationsdatum: 2018-06-08
    Beschreibung: Studies of polarized radiation from molecular clouds and the environments of protostars are providing information about the orientations and strengths of magnetic fields and the sizes andcompositions of dust grains in these environments.
    Schlagwort(e): Astronomy
    Materialart: Protostars and planets; Volume 4; 247-271
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  • 80
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) 181 Colloquium; Canterbury; United Kingdom
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  • 81
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Colloquium 180; Washington, DC; United States
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  • 82
    Publikationsdatum: 2018-06-08
    Beschreibung: We have combined 2MASS and POSS II data in a search for nearby ultracool dwarfs.
    Schlagwort(e): Astronomy
    Materialart: 14th International Astronomical Union (IAU) General Assembly; Manchester; United Kingdom
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  • 83
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    Publikationsdatum: 2018-06-08
    Beschreibung: Nulling interferometry has great protential in the search for planetary companions and exozodiacal disks, but the various approaches proposed remain largely unproven.
    Schlagwort(e): Astronomy
    Materialart: Darwin and Astronomy: The Infrared Space Interferometer; United States
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  • 84
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Society for Optical Engineering (SPIE), Interferometry in Optical Astronomy; Munich; Germany
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  • 85
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: American Astronomical Society Annual Meeting; Rochester, NY; United States
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  • 86
    Publikationsdatum: 2018-06-08
    Beschreibung: We present mid-infrared maps and preliminary analysis for 61 galaxies observed with the Infrared Space Observatory.
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal
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  • 87
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Division of Dynamical Astronomy; Yosemite, CA; United States
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  • 88
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    Publikationsdatum: 2018-06-08
    Beschreibung: We present a representative sample of near-infrared (1-2 mu m) images spanning the Hubble galaxy morphology classification sequence. The images come from the Two Micron All Sky Survey, with a range in brightness of 7 mag , K-s , 13.5 mag, and the morphological classifications from the NASA/IPAC Extragalactic Database.
    Schlagwort(e): Astronomy
    Materialart: Publications of the astronomical society of the Pacific; Volume 112; no. 774; 1008-1080
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  • 89
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU), The Formation of Binary Stars Symposium; Potsdam; Germany
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  • 90
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU), The Formation of Binary Stars; Potsdam; Germany
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  • 91
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: International Astronomical Union (IAU) Colluquium; Canterbury; United Kingdom
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  • 92
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Astronomical Data Analysis Software and System X; Boston, MA; United States
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  • 93
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    Publikationsdatum: 2018-06-08
    Beschreibung: These maps were acquired using the On-The-Fly (OTF) capability of the NRAO 12-meter telescope atop Kitt Peak in Arizona.
    Schlagwort(e): Astronomy
    Materialart: Astronomical Journal
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  • 94
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 195th Meeting of the American Astronomical Society; Atlanta, GA; United States
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  • 95
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: 195th Meeting of American Astonomical Society; Atlanta, GA; United States
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  • 96
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: AAS Meeting; Atlanta, GA; United States
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  • 97
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Astronomy
    Materialart: Astronomical Telescopes and Instrumenation, UV, Optical and IR Space Telescopes and Instruments VI; Munich; Germany
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  • 98
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    Publikationsdatum: 2019-07-27
    Beschreibung: Polycyclic aromatic hydrocarbons (PAHs) are now considered to be an important and ubiquitous component of the organic material in space. PAHs are found in a large variety of extraterrestrial materials such as interplanetary dust particles (IDPs) and meteoritic materials. PAHs are also good candidates to account for the infrared emission bands (UIRs) and the diffuse interstellar optical absorption bands (DIBs) detected in various regions of the interstellar medium. The recent observations made with the Infrared Space Observatory (ISO) have confirmed the ubiquitous nature of the UIR bands and their carriers. PAHs are thought to form through chemical reactions in the outflow from carbon-rich stars in a process similar to soot formation. Once injected in the interstellar medium, PAHs are further processed by the interstellar radiation field, interstellar shocks and energetic particles. A long-term laboratory effort has been undertaken to measure the physical and chemical characteristics of these carbon molecules and their ions under experimental conditions that mimic the interstellar conditions. These measurements require collision-free conditions where the molecules and ions are cold and chemically isolated. The spectroscopy of PAHs under controlled conditions represents an essential diagnostic tool to study the evolution of extraterrestrial PAHs. The laboratory results will be discussed as well as the implications for astronomy and for molecular spectroscopy. A review of the data generated through laboratory simulations of space environments and the role these data have played in our current understanding of the properties of interstellar PAHs will be presented. We will also present the new generation of laboratory experiments that are currently being developed in order to provide a closer simulation of space environments and a better support to space missions.
    Schlagwort(e): Astronomy
    Materialart: XXV European Congress on Molecular Spectroscopy (EUCMOS); 27 Aug. 1 Sep. 2000; Coimbra; Portugal
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  • 99
    Publikationsdatum: 2019-07-17
    Beschreibung: We present Sunyaev-Zel'dovich Effect (SZE) imaging observations of three distant (z greater than 0.8) and highly X-ray luminous clusters of galaxies, C1J1226+33, C1J0152-13 and MS1054-03. Two of the clusters, C1J1226+33 and C1J0152-13, were recently discovered in the WARPS X-ray survey. Their high X-ray luminosity suggests they are massive systems and, if confirmed, would provide strong constraints on the cosmological parameters of structure formation models. Our Sunyaev-Zel'dovich Effect data provide confirmation that they are massive clusters similar to the well studied cluster MS1054-03. Assuming the clusters have the same gas mass fraction derived from SZE measurements of eighteen known massive clusters, we are able to infer their mass and electron temperatures from the SZE data. The derived electron temperatures are 10.0, 8.5, and 10.3 KeV, respectively, and we infer total masses of approximately 2 x 10(circumflex) 14 h(circumflex) -l M - sun within a radius of 65" for all three clusters. For C1J0152-13 and MS1054-03 we find good agreement between our SZE derived temperatures and those derived from X-ray spectroscopic measurements. No X-ray derived temperatures are available for C1J1226+33, and thus the SZE data provide the first confirmation that it is indeed a massive system. The demonstrated ability to determine cluster temperatures and masses from SZE observations without access to X-ray data illustrates the power of using deep SZE surveys to probe the distant universe.
    Schlagwort(e): Astronomy
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  • 100
    Publikationsdatum: 2019-07-17
    Beschreibung: The famous HST/WFPC2 images of Eta Carinae provide a two-dimensional projection of the bipolar nebula that is really a three-dimensional structure. Much is hidden in subtle, projected details that a velocity-tuned instrument can pull apart. We have used the HST/STIS with a 52" x 0.1" aperture and with about 5000 spectral resolving power to examine the kinetic information contained within emission/absorption features. By velocity tuning, we can translate this information into spatial structures. The spectroscopic datasets have been transformed to a set of images, spaced at half instrumental line width steps, 15 - 20 km/s , and with a spatial resolution of 0.1 x 0.1 arcsec near Balmer beta and 0.25 x 0.1 arcsec near Balmer alpha. We examined these narrow-band images and individual spectra to characterize the nature of an internal nebula (formerly known as the Integral nebula). The shape of this nebulosity is an bipolar nebula, deeply embedded within the Homunculus, the well-known bipolar nebula surrounding Eta Carinae. The internal nebula is shaped nearly identically to the Homunculus. It is best described as a "little Homunculus within the Homunculus". Indeed, it is reminiscent of the Russian dolls, known as Matryoshka dolls, that successively nest within each larger doll. For that reason, we call this internal nebula the Matryoshka nebula. This was performed as one of the STIS GTO key projects and was funded by the HST project. Observations were done through the STScI.
    Schlagwort(e): Astronomy
    Materialart: AAS Meeting; Jan 07, 2001 - Jan 11, 2001; San Diego, CA; United States
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