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  • 2015-2019  (28)
  • 1995-1999  (32)
  • 1990-1994  (35)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7563-7569 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data of mercury vacancy equilibria in Hg1−xCdxTe for the compositions x=0.2 and x=0.3 are presented. In addition to common Hall-effect measurements, the composition x=0.2 is also studied by the positron annihilation technique. The results obtained are in good agreement with data published in the early eighties. A systematic discussion of the change of vacancy equilibria as well as conduction type for the composition interval x=0.2 to x=0.4 is given. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 182-184 (Feb. 1995), p. 155-158 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 343 (1992), S. 756-759 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The concentration of various foreign atoms in the compositional semiconductor Hg1−xCdxTe (x=0.2) has been determined by atomic absorption spectroscopy (AAS) and SIMS. The first problem of interest included the control of In doping of the (Hg,Cd)Te-melt solution and the epitaxial layers grown by step-cooling method. On the basis of analytical results it was possible to estimate the distribution coefficient k for the incorporation of indium into Hg1−xCdxTe. A value of k=3.2 has been found. This distribution coefficient did not change in the concentration range of In from 1×1016 atoms to 1×1018 atoms cm−3 in the melt solution. A distribution coefficient of about 3.0 was also determined by PIXE investigations. The second investigation concerned the level of background impurities in the bulk of HgCdTe crystals. The concentrations of some fast acceptors like Cu and Ag were determined. In the case of Ag it was confirmed, that the p-carrier concentration is influenced by the impurity level of Ag.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1435-926X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1435-0157
    Keywords: Key words USA ; groundwater management ; groundwater recharge/water budget ; legislation ; socioeconomic aspects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé La loi de 1995 sur la protection des consommateurs d'eau de Tucson (Arizona, États-Unis) a été promulguée à la suite des réclamations des consommateurs d'eau de Tucson alimentés en eau traitée à partir à la station centrale d'Arizona (CAP). Les conséquences de cette loi montrent les incertitudes et les difficultés qui apparaissent lorsque le public est appeléà voter sur un problème très technique. Les exigences de la loi en matière de recharge négligent les incertitudes hydrogéologiques du fait de la confusion entre "infiltration" et "recharge". C'est ainsi que la loi laisse entendre que l'infiltration à partir des lits de rivières le long du champ captant central favorise la recharge de cette zone. En réalité, les différences de perméabilité entre les alluvions du lit et les dépôts sous-jacents remplissant le bassin peuvent provoquer un écoulement sous-jacent. En outre, même si une recharge par l'eau de la rivière Colorado se produit dans cette zone, la nappe sera progressivement salifiée. Les restrictions imposées par la loi quant à l'utilisation de l'eau de la station centrale d'Arizona affectent les quatre outils réglementaires du Code des eaux souterraines de l'Arizona de 1980, en ce qu'ils concernent la zone de gestion active de Tucson: (a) l'augmentation de l'approvisionnement; (b) les conditions requises pour les prélèvements d'eau souterraine et les autorisations; (c) les conditions requises pour le plan de gestion, en particulier la pérennité du concessionnaire et les résultats en matière de qualité de l'eau; et (d) la condition que tous les nouveaux districts aient recours à des ressources en eau renouvelables à la place de l'eau souterraine. Les demandes concernant la mise en oeuvre de la loi ont conduit jusqu'à l'arrêt des activités normales des instances politiques.
    Abstract: Resumen El Acta de Protección de los Usuarios de Agua de Tucson, Arizona (EE.UU.) de 1995 (el Acta) se aprobó a raíz de las quejas de los usuarios de agua de Tucson que recibían agua tratada por el Proyecto de Arizona Central (CAP). Las consecuencias del Acta demuestran las incertidumbres y dificultades que se producen cuando se le pide al público que vote sobre temas muy técnicos. Los requerimientos de recarga del Acta desprecian incertidumbres hidrogeológicas al confundir entre "infiltración" y "recarga". Así, el Acta dice que la infiltración en los canales de los arroyos a lo largo del Campo de Producción Central aumentará la recarga a dicho campo. De hecho, la diferencia de permeabilidad entre el canal aluvial y los depósitos de relleno subyacentes puede provocar descarga subyacente. Además, incluso si el Río Colorado recargase este Campo Central, el agua subterránea se salinizaría progresivamente. Las restricciones del Acta sobre el uso del agua del CAP afectan los cuatro mecanismos legales del Código de Aguas Subterráneas de Arizona de 1980 relacionados con el Área de Gestión Activa de Tucson: (a) aumento del suministro; (b) requisitos y permisos para la extracción de aguas subterráneas; (c) necesidades del Plan de Gestión, particularmente la conservación obligatoria y temas de calidad de aguas; y (d) la obligación de que todas las nuevas subdivisiones usen agua con suministro renovable en lugar de subterránea. Como problemas adicionales se incluye la perturbación de las actividades políticas normales como consecuencia de las demandas para aprobar y poner en marcha el Acta.
    Notes: Abstract  The 1995 Water Consumer Protection Act of Tucson, Arizona, USA (hereafter known as the Act) was passed following complaints from Tucson Water customers receiving treated Central Arizona Project (CAP) water. Consequences of the Act demonstrate the uncertainties and difficulties that arise when the public is asked to vote on a highly technical issue. The recharge requirements of the Act neglect hydrogeological uncertainties because of confusion between "infiltration" and "recharge." Thus, the Act implies that infiltration in stream channels along the Central Wellfield will promote recharge in the Central Wellfield. In fact, permeability differences between channel alluvium and underlying basin-fill deposits may lead to subjacent outflow. Additionally, even if recharge of Colorado River water occurs in the Central Wellfield, groundwater will become gradually salinized. The Act's restrictions on the use of CAP water affect the four regulatory mechanisms in Arizona's 1980 Groundwater Code as they relate to the Tucson Active Management Area: (a) supply augmentation; (b) requirements for groundwater withdrawals and permitting; (c) Management Plan requirements, particularly mandatory conservation and water-quality issues; and (d) the requirement that all new subdivisions use renewable water supplies in lieu of groundwater. Political fallout includes disruption of normal governmental activities because of the demands in implementing the Act.
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  • 6
    ISSN: 1572-9605
    Keywords: Superconductivity ; environmental contamination ; amorphous ; YBa2Cu3O7-δ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A study of the environmental contamination of amorphous YBa2Cu3O7-δ fibers has been undertaken in order to determine the best method to handle these materials during the fabrication of superconducting wire. The fibers often need to be handled in organic solvents as part of the cleaning and manipulating process. In organics that are free of water, the fibers retain their mechanical strength with little carbon contamination or other ill effects. Water, however, causes premature crystallization and destroys the mechanical strength of the fibers.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 17 (1996), S. 493-506 
    ISSN: 1572-9559
    Keywords: SIS-mixer ; SIS-receiver ; tunerless mixer ; submillimeter wavelength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have developed broadband SIS heterodyne receivers for the frequency ranges from 440 to 500 GHz and 630 to 690 GHz. The mixerblocks contain a punched waveguide cavity which forms a fixed backshort. The substrate channel is sawed across the waveguide. The horn antenna is flanged to the mixerblock. The blocks are easy and quickly to manufacture even for the small dimensions needed in the submm wavelength range. We use Nb-Al2O3-Nb junctions with areas of 0.8 µm2 and integrated three step niobium tuning structures. With this design we achieve instantaneous double sideband receiver noise temperatures around 120 K over the frequency range from 660 to 690 GHz and around 80 K from 440 to 500 GHz. The mixer performance agrees well with the design calculations for the tuning structures.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 13 (1992), S. 15-26 
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A three-port approximation of the quantum mixer theory is employed to perform mixer gain calculations at 230 GHz for SIS junctions with integrated tuning structures. In addition, the embedding impedance range of a waveguide mixer mount has been obtained from model measurements and has been included in the gain calculations. The results show that even moderately small junctions can perform well in a waveguide environment when an integrated tuning structure is used. A three-element tuning circuit is presented that would allow broad band operation with a fixed embedding impedance which is important for applications using a planar antenna structure.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Human evolution 7 (1992), S. 33-48 
    ISSN: 1824-310X
    Keywords: Mesolithic odontometrics ; Olenii ostrov ; Skatenolm ; genetic divergence ; “Lapp” origins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Odontometric data are reported for Oleneostrovskii mogilnik, a Mesolithic cemetery in the Karelian USSR. Containing the skeletal remains of 148 individuals and dated to 7500b.p., it is the largest and oldest of the known peri-Baltic Mesolithic cemeteries. The dental data from this site are compared to those from Skateholm, where dental dimensions closely approximate the mean tooth sizes for all late Mesolithic European material. Olenii ostrov possesses a significantly smaller dentition, despite antedating the Skateholm sample by 1500 years. Geographic, archaeological, linguistic and ancillary dental data are discussed which argue strongly for the presence in Mesolithic northern Europe of at least two quasi-isolated human mating networks. One of these, documented by Olenii ostrov, may also represent the earliest evidence for the establishment in the taiga zone of populations whose descendants are the modern Saami (=”Lapps”).
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The present status of surface, interface andthin film studies with perturbed γγ-angular correlation (PAC) spectroscopy is reviewed. Applications include adsorbate diffusion andstructural phase transitions on stepped metal surfaces, surface andinterface magnetism as well as compound formation at reactive metal/metal interfaces. First applications to semiconductor surfaces andmetal/semiconductor interfaces are discussed.
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