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  • 1
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    Generation and Assimilation of Propagation Advice for HF Skywave Radar Systems (2008)
    Details
    Publication Date: 2017-04-04
    Description: HF skywave (OTH) radars operate in a very challenging environment so the objective of optimizing the radar resources to address the surveillance missions can be achieved only with the aid of a variety of support systems and models. As the technological sophistication of OTH radar increases and performance expectations rise, the demands on these ancillary support systems are growing. This paper reviews the present situation and looks at some prospective developments.
    Description: Finmeccanica Selex - Sistemi Integrati, Italy
    Description: Published
    Description: Sheraton Golf Parco dè Medici, Roma
    Description: 1.7. Osservazioni di alta e media atmosfera
    Description: reserved
    Keywords: skywave propagation ; OTH radar ; frequency advice ; 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation ; 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 2
    Electronic Resource
    Electronic Resource
    Survival of copepods passing through a nuclear power station on northeastern Long Island Sound, USA (1974)
    Springer
    Marine biology 24 (1974), S. 49-55 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract About 70% of the copepods entering the cooling water system of a nuclear power plant on northeastern Long Island Sound (USA) are not returned to the Sound in the effluent. Copepod mortalities are caused by the mechanical or hydraulic stresses of passage, although our experimental design could not determine whether heat or chlorination could cause mortality in the absence of mortality induced by hydraulic stress. After passing through the power plant, copepods sink rapidly (ca. 2.5 times faster than controls). This leads to an increase in concentrations of copepods suspended in the deep water (25 to 30 m) of the effluent pond. About half of the live copepods collected at the discharge and held in situ died within 3.5 days, and 70% died within 5 days, whereas only 10% of those from the intake died in 5 days. About 60% of the copepods observed suspended in deep water in the pond were dead. The copepod mortality caused by the power plant reflects the loss in secondary production occurring below about 270×103 m2 of sea surface in Long Island Sound annually. This loss represents a reduction of about 0.1% in the annual secondary production over a 333 km2 area of Long Island Sound adjacent to the power plant. Highest losses occurred during the spring (April, 1.4×106 g dry weight), the lowest in autumn (November, 45.8×103 g). If the same copepod loss rate exists for all power plants in Long Island Sound, then secondary production in 1.69×106 m2, or 0.05% of the total copepod production may be lost annually. A comparison of the surface outflow from Long Island to Block Island Sound with the water entrained through Millstone Unit One, and the 70% copepod loss rate in the latter area, indicates that Unit One eliminates about 0.1 to 0.3% of the copepod production in eastern Long Island Sound. This calculation compares favorably with losses computed from production data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402846
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cooling water chlorination and productivity of entrained phytoplankton (1972)
    Springer
    Marine biology 16 (1972), S. 37-40 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study to determine the effects of various concentrations of chlorine on the productivity of entrained marine phytoplankton was carried out at a nuclear power station on northeastern Long Island Sound, USA. Chlorine is a biocide used to control the growth of marine fouling organisms on the walls of many power station cooling systems. Chlorine concentrations considerably below those required to eliminate fouling organisms produced large decreases in the productivity of entrained phytoplankton. Generally, between 0.25 and 0.75 ppm residual chlorine at the cooling water discharge, continuously applied, is required to eliminate fouling organisms. At the highest chlorine concentration tested, 0.4 ppm residual at discharge (addition of chlorine at 1.2 ppm at cooling water intake), there was an 83% decrease in productivity as compared with the productivity at the intake. Productivity measurements were made at 6 other continuously applied chlorine concentrations. At the lowest concentration tested, too low to measure with our analytical method (addition of chlorine at 0.1 ppm at the intake), we measured a production decrease of 79%. Thus, a decrease in chlorination dosage of over an order of magnitude produced essentially no reduction in the damage done to entrained phytoplankton. Application of chlorine intermittently produced somewhat less of a decrease in primary productivity. When there was no chlorine addition during the period of study, there was essentially no effect on productivity. These data indicate that chlorine cannot be used effectively as a biocide for fouling organisms without having adverse effects on entrained phytoplankton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347845
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  • 4
    Electronic Resource
    Electronic Resource
    Regulation of Lymphocyte Function by Protein Phosphorylation (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Immunology 11 (1993), S. 451-499 
    Details
    ISSN: 0732-0582
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.iy.11.040193.002315
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    AlGaInP/GaAs red edge-emitting diodes for polymer optical fiber applications (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2091-2092 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed and cw operation of AlGaInP/GaAs graded refractive index separate confinement heterostructure edge light-emitting diodes fabricated from epitaxial structures grown by organometallic vapor phase epitaxy is reported. The device consists of an active region of a single 100 A(ring) quantum well of ternary Ga0.5In0.5P and 1600-A(ring)-thick lattice-matched confining layers of quaternary (AlxGa1−x)0.5In0.5P. A coupled power of −10 dBm at 100 mA into a 500 μm polymer optical fiber of 0.48 NA is realized in a package consisting of a graded refractive index lens with uncoated facets from a 60×300 μm mesa-shaped stripe geometry diode. The 10–90% rise and fall times at 100 mA with a 5 mA prebias were measured to be 5 ns. Higher launched powers are expected to result from improvements in the materials growth, facet coatings, and packaging techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100497
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  • 6
    Electronic Resource
    Electronic Resource
    Distance and the conventionality of simultaneity in special relativity (1992)
    Springer
    Foundations of physics 5 (1992), S. 199-220 
    Details
    ISSN: 1572-9524
    Keywords: special relativity ; conventionality ; gauge transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conventionality of simultaneity within inertial frames is presented in a general formalism that clarifies the relationship of spatial measures to the choice of simultaneity. A number of claims that such measures undermine the conventional nature of simultaneity are presented and shown to be unfounded. In particular, a recent claim by Coleman and Korte [9] that such measures empirically establish a unique simultaneity relationship is shown to be in error. In addition, the general formalism enables the empirical status of simultaneity within an inertial frame to be clarified by presenting the choice of simultaneity as a gauge choice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692800
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  • 7
    Electronic Resource
    Electronic Resource
    Dwarf pea response to gibberellic acid applied to soil through a drip irrigation system, and gibberellic acid biodegradation in soil (1988)
    Springer
    Plant and soil 112 (1988), S. 289-292 
    Details
    ISSN: 1573-5036
    Keywords: biodegradation ; drip irrigation ; gibberellic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Gibberellic acid (29 or 290 μM) injected into drip irrigation lines significantly stimulated internode elongation of dwarf peas, and the 290-μM soil treatment produced significantly taller plants than did the 29-μM treatment. GA3 uptake may limit GA-induced internode elongation when GA3 is applied to soil, in contrast to results obtained for hydroponically grown plants, where uptake initially appeared to exceed the rate of hormone metabolism (andersonet al.). It is likely that biodegradation or chemical inactivation limited the plant-availability of GA3 in the soil. Degradation of moderate GA3 concentrations in a moist, aerobic loamy fine sand was nearly complete within five days, indicating that the inefficiency of soil applications may outweight the benefits provided by reducing labor costs associated with foliar-spray applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02140008
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of concentration and treatment duration upon dwarf pea response to gibberellic acid root treatments in solution culture (1988)
    Springer
    Plant and soil 112 (1988), S. 279-287 
    Details
    ISSN: 1573-5036
    Keywords: gibberellic acid ; gibbrrellin conjugates ; hydroponic solution ; internode elongation ; Pisum sativum ; root treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Gibberellic acid (GA3) root treatments stimulated internode elongation of hydroponically grown dwarf pea seedlings (Pisum sativum L.,cv. Little Marvel) When the GA3 concentration in the solution was at least 2.9 μM. Both GA3 concentration and the duration of the root-treatment period significantly affected internode elongation. This is attributed to a limited availability or saturation of active sites for gibberellin-induced cell elongation. The amount of GA3 taken up through the roots in 1 day from a 29 μM GA3 solution apparently equaled or exceeded the amount which could be metabolized during the first four days after treatment, although higher concenrations and longer treatment periods produced a more prolonged response, conceivably due to 1) initial saturation of gibberellin active sites, 2) storage of surplus gibberellin in the plant, and 3) subsequent utilization of the stored gibberellin. GA3-induced stem elongation in hydroponically grown Little Marvel peas seemed to be limited initially by apparent saturation of active sites when the GA3 concentration exceeded 29 μM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02140007
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  • 9
    Electronic Resource
    Electronic Resource
    Association between feral pig disturbance and the composition of some alien plant assemblages in Hawaii Volcanoes National Park (1991)
    Springer
    Plant ecology 95 (1991), S. 55-62 
    Details
    ISSN: 1573-5052
    Keywords: Alien plants ; Hawaii ; Soil disturbance ; Sus scrofa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Association analysis was used to assess relationships among 25 important alien plant species and their association with feral pig rooting in Hawaii Volcanoes National Park, Hawaii, U.S.A. Results of the association analysis were summarized by means of a simplified, rank-based, polar ordination which yielded three subjective species assemblages. One group was characterized by an association with the endpoint species, Ehrharta stipoides. A second group consisted of species associated with the other endpoint species, Andropogon virginicus. The third group comprised a diverse assemblage of 14 species in the middle of the ordination. Comparison of ordination scores with each species's association with pig-induced soil disturbance revealed that members of the Ehrharta group were strongly positively associated with pig activity, whereas members of the Andropogon group were generally negatively associated. The third group showed no association with pig-induced soil disturbance. These results suggest a strong relationship between feral pig activity and the composition of the alien portion of the plant community. Analysis of the ecologies of both plants and pigs suggests that some species may both encourage pig activity and benefit from it. Likewise, other alien plants appear to neither require nor benefit from pig-induced soil disturbance. While pigs appear to play an important role in the organization of these communities, their removal may have a negligible impact on the success of many of the common weeds in the area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00124953
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  • 10
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    The Syk and ZAP-70 SH2-containing tyrosine kinases are implicated in pre-T cell receptor signaling (1997)
    National Academy of Sciences
    Details
    Publication Date: 1997-09-02
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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