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  • 2000-2004  (116)
  • 1945-1949  (25)
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  • 1
    Digitale Medien
    Digitale Medien
    Direct observation of the Gouy phase shift in THz impulse ranging (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 670-672 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Here we present a direct observation of the Gouy effect through THz impulse scattering from cylindrical and spherical targets. A π/2 Gouy phase shift through a one-axis focus compared to the more common π phase shift of the two-axis focus is required to interpret the scattering results using a physical optics model. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.125857
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  • 2
    Digitale Medien
    Digitale Medien
    Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1987-1989 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Waveguide propagation of sub-ps terahertz pulses in single-crystal sapphire fibers is reported. An incident THz pulse of approximately 0.6 ps duration undergoes considerable reshaping due to the absorptive and dispersive waveguide propagation, resulting in transmitted chirped pulse durations of 10–30 ps. Good agreement between theory and experiment is obtained by analyzing the propagation in terms of the single HE11 waveguide mode. The dominance of the single HE11 mode, despite the fiber dimensions allowing for multimode propagation, is attributed to the free-space to waveguide coupling. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.126231
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  • 3
    Digitale Medien
    Digitale Medien
    WINDPOWER: A Turn of the Century Review (2000)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 25 (2000), S. 147-197 
    Details
    ISSN: 1056-3466
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Energietechnik
    Notizen: Abstract The 1990s saw a resurgence in the windpower industry, with installed grid-connected capacity expanding more than five-fold between 1990 and 2000. Most of this increase occurred in Europe, where governmental policies aimed at developing domestic energy supplies and reducing pollutant emissions provided a sheltered market for renewable energy generation. The 1990s were also marked by a return to large, megawatt-sized wind turbines, a reduction and consolidation of wind turbine manufacturers, and increased interest in offshore windpower. This article reviews recent trends in the windpower industry, including some of the fundamental engineering principles of wind turbine design. Technological impediments and advances are discussed in the context of changes in the global electricity markets and environmental performance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.energy.25.1.147
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  • 4
    Digitale Medien
    Digitale Medien
    At the Commission’s Discretion: Cartelbusting and Fining Infringements Under the EU’s Restrictive Practices Policy (2000)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd 2000
    Public administration 78 (2000), S. 0 
    Details
    ISSN: 1467-9299
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Politikwissenschaft , Wirtschaftswissenschaften
    Notizen: Although the last decade has seen an increased interest from political science in many aspects of EU competition policy the issue of cartelbusting has been almost totally neglected. This is a curious situation given that this remains by far the major aspect of the European Commission’s activities in the competition arena. By merging the available, albeit extremely limited, public administration and policy studies literature with the legal literature the article endeavours to begin to redress the balance by examining the EU’s restrictive practices policy. It pays particular attention to the European Commission and its Directorate General responsible for com-petition policy (DGIV) and their activities in their enduring war against cartels. At its core this article analyses the Commission’s quasi-judicial authority in relation to cartel arrangements, identifies the extent to which the decision-making process is open to substantial degrees of administrative discretion within DGIV and makes specific reference to its policy on fining infringements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1467-9299.00222
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  • 5
    Digitale Medien
    Digitale Medien
    Development and evaluation of a diatom-conductivity model from lakes in West Greenland (2002)
    Oxford UK : Blackwell Science Ltd
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: 1. The area around Kangerlussuaq (Søndre Strømfjord; West Greenland, 67°N 51°W) contains thousands of lakes ranging from coastal, dilute (conductivity 〈 30 μS cm–1) oligotrophic systems to subsaline (∼4000 μS cm–1), closed basin lakes close to the ice sheet margin. In closed basins, salinity (or conductivity) is often a proxy for effective moisture, and thus palaeorecords of lake conductivity can provide valuable palaeoclimatic data. Little or nothing is known about the recent history of these lakes and hence it is difficult to evaluate how they will respond to effects of future changes.2. Over 100 lakes have been sampled (1996–2000) between the ice sheet and the outer coast for a variety of water chemical and limnological variables. Surface sediments were taken from a subset of 40 lakes and analysed for diatoms. Diatom responses to 28 environmental variables were analysed by multivariate ordination techniques and indicate that the main gradient is highly correlated to conductivity (explaining ∼12% of species variance). Despite the relatively short gradient (24–4072 μS cm–1), diatom assemblages exhibit a clear response to conductivity. The most saline lakes do not contain a true saline flora.3. We developed a range of weighted averaging (WA) and weighted-averaging partial least squares (WA-PLS) models from this training data set and found two component WA-PLS models performed best. The effects of data transformation and omission of dissolution susceptible species (Diatoma spp.) on model performance were also examined. The error statistics for the preferred WA-PLS (2) model (r2jack=0.88, root mean square error of prediction (RMSEP)=0.217 log μS cm–1) compare well with other published models.4. A 210Pb-dated short core from a meromictic, subsaline lake (Braya Sø; location 67°N, 51°W, max. depth 23 m; conductivity 2600 μS cm–1) was analysed for diatoms. Diatom preservation is poor and some taxa (e.g. Diatoma spp.) are badly corroded. Lake water conductivity was reconstructed using WA-PLS models. Diatom-inferred conductivity ranges from 1800 to 4400 μS cm–1 over the last 600 years (extrapolated 210Pb chronology).5. The Kangerlussuaq area of West Greenland is an important area for palaeoclimatic research, located as it is between the Greenland ice sheet (ice core records) and the Davis Straits to the west. The development of a statistically robust transfer function for diatoms and conductivity will enable the reconstruction of conductivity from the many subsaline lakes around the head of the fjord and, hence, regional estimates of changing palaeoprecipitation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00832.x
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  • 6
    Digitale Medien
    Digitale Medien
    Gladiolic Acid: an Antifungal and Antibacterial Metabolic Product of Penicillium gladioli McCull and Thom (1946)
    [s.l.] : Nature Publishing Group
    Nature 157 (1946), S. 697-698 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IT has been shown by Wilkins and Harris1, 2 that Penicillium gladioli produces an antibacterial substance when grown on liquid nutrient media. We have found that culture filtrates produced by this mould are toxic to fungi, the antifungal effect being more marked than the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/157697c0
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  • 7
    Digitale Medien
    Digitale Medien
    Biologically Active Metabolic Products of the Mould Metarrhizium glutinosum S. Pope (1946)
    [s.l.] : Nature Publishing Group
    Nature 157 (1946), S. 334-334 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN 1944 we obtained a culture of a Metarrhizium sp. from the United States Department of Agriculture, which had been described by Great-house, Klemme and Barker1 as an active decomposer of cellulose, particularly suitable for in vitro assessment of textile preservative ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/157334a0
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  • 8
    Digitale Medien
    Digitale Medien
    Viridin: a Highly Fungistatic Substance Produced by Trichoderma viride (1945)
    [s.l.] : Nature Publishing Group
    Nature 156 (1945), S. 144-145 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE mould Trichoderma viride Pers. ex Fries is generally known to possess marked powers of antagonism to other fungi. It has been previously shown1 that some strains of this mould produce gliotoxin. We have recently found a number of strains which produce another substance, which ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/156144a0
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  • 9
    Digitale Medien
    Digitale Medien
    Origin of a Toxicity to Mycorrhiza in Wareham Heath Soil (1945)
    [s.l.] : Nature Publishing Group
    Nature 155 (1945), S. 637-638 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] CONSIDERABLE interest has been aroused by the researches of Rayner1 and Neilson Jones2 on a growth failure of conifers at Wareham Heath, Dorset. These workers have demonstrated that this growth failure is associated with the development, in the soil, of a definite ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/155637a0
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  • 10
    Digitale Medien
    Digitale Medien
    Fungistatic Activity of Ethylenic and Acetylenic Compounds (1946)
    [s.l.] : Nature Publishing Group
    Nature 158 (1946), S. 876-876 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN a recent discussion of the lachrymatory activity of some ethylenic compounds, Dixon and, Needham1 have suggested that lachrymatory properties are conferred by certain substituent groups (ketone, aldehyde, ester, nitro-, etc.) which polarize the adjacent olefinic linkages, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/158876a0
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