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  • Articles: DFG German National Licenses  (42)
  • 2000-2004  (11)
  • 1995-1999  (31)
  • 1
    Electronic Resource
    Electronic Resource
    Branching behavior of standing waves—The signatures of resonance (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 11 (1999), S. 1051-1064 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Arclength continuation methods are used to conduct a detailed branching study of standing wave solutions for fluids in a rectangular container, using depth and crest acceleration as control parameters. At each depth the applicable acceleration range extends between zero and one, and a number of multiple solution structures are uncovered. An intimate connection is established between these structures and the phenomenon of harmonic resonance. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869976
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  • 2
    Electronic Resource
    Electronic Resource
    Cadmium leaching from some New Zealand pasture soils (2003)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 54 (2003), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Cadmium (Cd) inputs and losses from agricultural soils are of great importance because of the potential adverse effects Cd can pose to food quality, soil health and the environment in general. One important pathway for Cd losses from soil systems is by leaching. We investigated loss of Cd from a range of contrasting New Zealand pasture soils that had received Cd predominantly from repeated applications of phosphate fertilizer. Annual leaching losses of Cd ranged between 0.27 and 0.86 g ha–l, which are less than most losses recorded elsewhere. These losses equate to between 5 and 15% of the Cd added to soil through a typical annual application of single superphosphate, which in New Zealand contains on average 280 mg Cd kg−1 P. It appears that Cd added to soil from phosphate fertilizer is fairly immobile and Cd tends to accumulate in the topsoil. The pH of the leachate and the total volume of drainage to some extent control the amount of Cd leached. Additional factors, such as the soil sorption capacity, are also important in controlling Cd movement in these pasture soils. The prediction of the amount of Cd leached using the measured concentrations of Cd in the soil solution and rainfall data resulted in an overestimation of Cd losses. Cadmium concentrations in drainage water are substantially less than the current maximum acceptable value of 3 µg l−1 for drinking water in New Zealand set by the Ministry of Health.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.2003.00495.x
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  • 3
    Electronic Resource
    Electronic Resource
    Solubility, sorption and desorption of native and added cadmium in relation to properties of soils in New Zealand (1999)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 50 (1999), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Solution cadmium (Cd) concentrations and sorption and desorption of native and added Cd were studied in a range of New Zealand soils. The concentration of Cd in solution and the concentrations and patterns of native soil Cd desorbed and added Cd sorbed and desorbed varied greatly between the 29 soils studied. Correlation analysis revealed that pH was the most dominant soil variable affecting solution Cd concentration and sorption and desorption of native and added Cd in these soils. However, organic matter, cation exchange capacity (CEC) and total soil Cd were also found to be important. Multiple regression analysis showed that the log concentration of Cd in solution was strongly related to soil pH, organic matter and total Cd, which in combination explained 76% of the variation between soils. When data from the present study were combined into a single multiple regression with soil data from a previously published study, the equation generated could explain 81% of the variation in log Cd solution concentration. This reinforces the importance of pH, organic matter and total Cd in controlling solution Cd concentrations. Simple linear regression analysis could at best explain 53% of the total variation in Cd sorption or desorption for the soils studied. Multiple regression analysis showed that native Cd desorption was related to pH, organic matter and total Cd, which in combination explained 85% of the variation between soils. For sorption of Cd (from 2 μg Cd g–1 soil added), pH and organic matter in combination explained 75% of the variation between soils. However, for added Cd desorption (%), pH and CEC explained 77%. It is clear that the combined effects of a range of soil properties control the concentration of Cd in solution, and of sorption and desorption of Cd in soils. The fraction of potentially desorbable added Cd in soils could also be predicted from a soil’s Kd value. This could have value for assessing both the mobility of Cd in soil and its likely availability to plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.1999.00221.x
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of an elliptical fiber mode field using near-field microscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5514-5517 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Near-field scanning optical microscopy is used to determine the field structure within a noncircularly symmetric optical fiber. The output from an elliptical core fiber is measured and found to be in good agreement with the field predicted using a point matching method and fiber parameters determined from the preform. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359255
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  • 5
    Electronic Resource
    Electronic Resource
    Field characterization of a D-shaped optical fiber using scanning near-field optical microscopy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 510-513 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Scanning near-field optical microscopy is used to measure the mode profile and evanescent field of a Ge-doped D-shaped optical fiber. The structure of the fiber is determined by differential etching followed by an investigation of the resultant topography with an atomic force microscope. This information is then used to theoretically model the expected behavior of the fiber and it is shown that the theoretical results are in excellent agreement with the experimentally observed field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365608
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  • 6
    Electronic Resource
    Electronic Resource
    Direct imaging of end-of-range compaction in ion beam irradiated silica waveguides by atomic force microscopy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 8429-8432 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The end-of-range compaction induced by megaelectronvolt proton irradiation of fused silica has been imaged by atomic force microscopy. A maximum surface compaction of 50 nm was measured for an ion dose of 4.0×1015ions cm−2. A linear correlation between ion dose and compaction has been observed in the range of 1.0 to 4.0×1016 ions cm−2. When the samples were left at room temperature over a period of several months, the amount of compaction appeared to decrease significantly which suggests some temporal annealing of the waveguides has occurred. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373558
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  • 7
    Electronic Resource
    Electronic Resource
    REVIEWING THE BRITISH LATE UPPER PALAEOLITHIC: NEW EVIDENCE FOR CHRONOLOGICAL PATTERNING IN THE LATEGLACIAL RECORD (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Oxford journal of archaeology 15 (1996), S. 0 
    Details
    ISSN: 1468-0092
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Archaeology
    Notes: Summary. Variation in Lateglacial lithic assemblages has led some researchers to sub-divide the British Later Upper Palaeolithic into two or more typologically distinct phases (Campbell 1977; Jacobi 1988). Until now, however, the chronological relationships between the different phases have been difficult to demonstrate. In this paper we present new dating evidence for two distinct blade technologies of Lateglacial type found in southwest Britain. The first corresponds to the ‘Creswellian’(as defined by Jacobi 1991; Jacobi and Roberts 1992), and is dated to the earlier part of the Lateglacial Interstadial (c. 13–12,000 years BP); the second technology compares with European Federmessergruppen assemblages (literally, ‘penknife group’ industries, as described in Schwabedissen 1954) of the ‘forested’ phase of the Interstadial (c. 12–11,000 years BP). In addition to presenting the new dates, this paper explores the implications of treating the technologies as separate entities and puts forward preliminary ideas on differences in raw material use and other human subsistence behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-0092.1996.tb00085.x
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  • 8
    Electronic Resource
    Electronic Resource
    Raster-scan imaging with normal-incidence, midinfrared InAs/GaAs quantum dot infrared photodetectors (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 3265-3267 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate normal incidence infrared imaging with quantum dot infrared photodetectors using a raster-scan technique. The device heterostructure, containing multiple layers of InAs/GaAs self-organized quantum dots, were grown by molecular-beam epitaxy. Individual devices have been operated at temperatures as high as 150 K and, at 100 K, are characterized by λpeak=3.72 μm, Jdark=6×10−10 A/cm2 for a bias of 0.1 V, and D*=2.94×109 cm Hz1/2/W at a bias of 0.2 V. Raster-scan images of heated objects and infrared light sources were obtained with a small (13×13) interconnected array of detectors (to increase the photocurrent) at 80 K. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1476387
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  • 9
    Electronic Resource
    Electronic Resource
    Pioneers of Photogrammetry Commemorated In Antarctic Place-Names (1996)
    Oxford UK and Boston, USA : Blackwell Publishers Ltd.
    The @photogrammetric record 15 (1996), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Unique place-names are essential for scientific fieldwork in Antarctica. This shorter contribution describes how duplication of place-names in British Antarctic Territory has been avoided by the systematic naming of geographically related features according to groups of associated ideas. One such theme, commemorating pioneers in the development of photogrammetry, recognizes the important contribution of photogrammetry to Antarctic mapping and research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00067
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  • 10
    Electronic Resource
    Electronic Resource
    Congenital chylothorax in siblings (2000)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 107 (2000), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.2000.tb11678.x
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