ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Keywords
Publisher
Language
Years
  • 1
    facet.materialart.
    Unknown
    The interplay between wind stress and surface buoyancy forcing in driving ocean circulation (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-15
    Description: The large-scale ocean circulation is fuelled by a combination of winds and buoyancy (or heat) fluxes acting on the ocean’s surface. Gyres are central features of large-scale ocean circulation and are involved in the transport of many tracers like heat, nutrients, carbon-dioxide and so on within and across ocean basins. Traditionally, the gyre circulation is explained by the relationship between meridional transport and wind stress curl, known as the Sverdrup balance. However, it has been proposed that surface buoyancy fluxes may also contribute to the formation of gyres, although such a theoretical relationship is lacking in oceanographic literature. Through a series of eddy-permitting global ocean model simulations, we aspire to better understand the relative contribution of wind stress and surface buoyancy fluxes on large-scale ocean circulation. We perturb the atmospheric forcing by spatially varying the wind stresses and/or surface buoyancy fluxes, while minimising the associated changes in mixed layer dynamics. We compare perturbed forcing simulations with a control simulation in an attempt to decompose the large- scale ocean circulation into buoyancy and wind-driven components.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    How much upwelling occurs in the abyssal bottom boundary layer? (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-18
    Description: We examine (i) what sets the vertical stratification in the abyssal ocean, and (ii) the rate of upwelling of water in the bottom boundary layer of the abyssal ocean. We restrict attention to the bottom-most, densest, 2000m of the ocean and analyse the buoyancy budget in buoyancy coordinates, taking into account the bottom-intensified nature of the rate of diapycnal mixing in the ocean. This bottom-intensified nature of diapycnal mixing means that the diapycnal velocity in the ocean interior is downwards towards denser fluid, and all the diapycnal upwelling occurs in the first ~50m above the sea floor, with the upwelling transport in this Bottom Boundary Layer often being two or three times the net diapycnal upwelling needed to balance the sinking transport of Antarctic Bottom Water. The geometry and conservation equations of this problem can be described as a steady-state filling-box problem. The rate of sinking of dense Antarctic Bottom Water and the area-integrated diffusive buoyancy flux across the upper-most buoyancy surface are both regarded as given input parameters, which gives the buoyancy contrast between the sinking Antarctic Bottom Water and the value of buoyancy on this upper-most surface. We show that the vertical stratification in the interior abyssal ocean is then entirely determined by knowledge of the rate of detrainment (or entrainment) of plume fluid out of (into) the sinking plume and into (out of) the ocean interior. This knowledge is equivalent to knowledge of the area-integrated diffusive buoyancy flux on the buoyancy surfaces in the abyss.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Effect of magnetic domain configuration on read-back amplitude variations in inductive film heads (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5423-5423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Narrow track width, high-performance inductive film heads exhibit a noise phenomenon in which the read-back peak amplitude varies after writing with the head. This noise phenomenon was studied in 6- to 8-μm track width, 31-turn double layered coil, film heads using a scanning Kerr effect microscope. These heads, made from electroplated permalloy films with a magnetostrictive coefficient of − 1.6 × 10−6, were specially selected for the study to have varying levels of read-back amplitude variation by using the percent variation in the peak amplitude after repeated writes as a quantitative noise figure. A statistical sampling method was used to quantitatively measure the magnetic domain patterns in the top NiFe layer of the heads under simulated operating conditions. Quantitative correlation was found between the read-back variation and the magnetization orientation in the narrow-sloped pole region. The images show that a single 180° domain wall orientated longitudinally to the flux conduction direction in the narrow pole piece is the major source of read-back variation in these types of heads. The statistical sampling method shows that the pole domain configurations are reproducible in both the low-noise and high-noise heads. Patterned NiFe films on planar alumina substrates have the desired transverse oriented 180° domain wall configuration in the pole-shaped region, as found in the low-noise heads.These results imply that the variation of the domain configuration in the pole region is caused by easy axis reorientation due to variation in the stress-induced magnetic anisotropy in that region. We also find that the read-back noise is not sensitive to the longitudinal 180° walls found near the back closure region of the heads. This is probably due to the lower flux densities found in the back closure as compared to the pole region and the existence of other flux paths that circumvent the domain walls in the back closure region. We conclude that read-back distortion noise in 6-μm track width heads can be drastically reduced by maintaining a transverse magnetic easy axis in the sloped pole piece by either employing fabrication methods that control the stress state of the pole region or by using very small magnetostriction values in the NiFe films.1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347998
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    THE INADEQUACY OF UNIT VALUE INDEXES AS PROXIES FOR CANADIAN INDUSTRIAL SELLING PRICE INDEXES (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Review of income and wealth 19 (1973), S. 0 
    Details
    ISSN: 1475-4991
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This paper considers the adequacy of unit value indexes as proxies for industrial selling price indexes in Canada, in light of the considerations raised in the Searle report for the United States (summarized elsewhere in this issue). Some 3,237 regressions are run using the industrial selling price index for a commodity group as the dependent variable and the corresponding unit value index as the independent variable. The unit value indexes perform poorly as predictors of the I.S.P.I.; the overall tendency is for the unit value index to overestimate changes in the I.S.P.I.; and to explain on average only about 30 percent of the total variance of the I.S.P.I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-4991.1973.tb00891.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Thermo-optic investigation of heating during electrical breakdown in avalanche photodiodes (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5054-5062 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have experimentally determined the internal temperature rise caused by electrical breakdown in a silicon avalanche photodiode by observing changes in the diode's optical properties. The spatial profile and temporal dependence of the temperature rise are both measured as a function of photodiode voltage. The results are consistent with a thermo-optic theoretical model, which assumes a scaling of the width of the breakdown filament that increases with the magnitude and duration of the steady-state breakdown current. The radius of the optical modulation was experimentally observed to range from about 1.5 to 3 μm. A single free parameter is used to obtain consistency between theory and experiment: the breakdown filament's full width at half maximum is assumed to equal 1.28 μm for an overvoltage of 10 V and a delay of 96 ns, for the diode studied. Modulation of the read beam was observed at a level as low as 10±6 absorbed photons per write pulse, demonstrating near-photon-counting response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357217
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Rubber Determination of Young Guayule (1947)
    s.l. : American Chemical Society
    Analytical chemistry 19 (1947), S. 313-317 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60005a009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Efficient Apparatus for Leaching Samples with Water (1947)
    s.l. : American Chemical Society
    Analytical chemistry 19 (1947), S. 808-809 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60010a015
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The crystallography and defect chemistry of structural faults in lithium niobate (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5295-5301 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transmission electron microscope studies of Ti-doped, congruent lithium niobate (LiNbO3) have shown that extended structural faults and domain boundaries are only present within the Ti-diffused layer (i.e., the waveguiding region). Structural faults have also been observed in undoped Li-deficient LiNbO3, though not in undoped control crystals of congruent and stoichiometric LiNbO3. In both Ti-doped and Li-deficient LiNbO3, crystal chemistry predicts an increase in the concentration of the point defects V'''''Nb and Nb⋅⋅⋅⋅Li. Therefore, it appears that the coalescence of these defects is responsible for the creation of structural faults. Since the extent of these structural faults and domain boundaries is tens of microns, they are clearly potential scattering sites for photons. In this regard, a systematic understanding of their origin and thermal stability is crucial to integrated optical device technologies based on LiNbO3 and on the Ti-doped waveguide fabrication technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340393
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    A new rutile structure solid-solution phase in the LiNb3O8-TiO2 system, and its role in Ti diffusion into LiNbO3 (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3836-3839 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An extensive range of solid solubility was found in the LiNb3O8-TiO2 system. The solid-solution phase has the undistorted rutile structure for 0.40≤x≤1.0 in (Li0.25Nb0.75O2)1−x (TiO2)x. A member of this series, with x≈0.58, is proposed to be the intermediate phase formed during Ti indiffusion in LiNbO3 during optical waveguide formation, rather than Ti0.65Nb0.35O2 as was previously postulated. This assignment agrees with the experimental results of previous studies of Ti indiffusion into LiNbO3 single crystals, and is consistent with a Ti diffusion mechanism based on defect chemistry studies. The preparation and structural characterization of the LiNb3O8-TiO2 solid-solution phase is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337777
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Electron impact heated atomic hydrogen oven (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1520-1525 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design, construction, and performance of an electron impact heated hydrogen dissociation oven for use in producing an atomic hydrogen gas target for ion–atom collision experiments are described. This novel design utilizes an electron beam focused by a spherical lens system to heat the oven to temperatures in excess of 2400 K. High dissociation fractions are found with cell pressures ≥5 mTorr. The compact design allows placement of an electron spectrometer close to the interaction region (length ∼1.5 cm), as well as direct measurement of the oven temperature by means of an optical pyrometer. The electron beam produces magnetic fields ∼40 mG ∼1 cm from the center of the interaction region. These low magnetic fields offer distinct advantages compared to low-voltage, high-current oven designs when observing relatively low-energy electrons ejected in ion–atom collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138147
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...