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  • BSZ  (22)
  • English  (22)
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  • English  (22)
  • 1
    Book
    Book
    GSM : switching, services, and protocols (1999)
    Chichester : Wiley
    Details
    UID:
    (DE-627)249098717
    Format: XII, 274 S , zahlr. graph. Darst , 25 cm
    Edition: Repr
    ISBN: 0471982784
    Uniform Title: GSM, Global System for Mobile Communication 〈dt.〉
    Note: Includes bibliographical references and index
    Language: English
    Subjects: Engineering
    RVK:
    ZN 6550
    Keywords: GSM-Standard
    URL: Inhaltsverzeichnis
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  • 2
    Online Resource
    Online Resource
    GSM - Architecture, Protocols and Services : Architecture, Protocols and Services (2008)
    New York : John Wiley & Sons, Incorporated
    Details
    UID:
    (DE-627)1658273176
    Format: 1 online resource (340 pages)
    Edition: 3rd ed.
    ISBN: 9780470741726
    Content: The millions of viewers who tune into Boston's television show, readers of "Millionaire" books.
    Content: Intro -- GSM - Architecture, Protocols and Services Third Edition -- Contents -- Preface -- 1 Introduction -- 1.1 The idea of unbounded communication -- 1.2 The success of GSM -- 1.3 Classification of mobile communication systems -- 1.4 Some history and statistics of GSM -- 1.5 Overview of the book -- 2 The mobile radio channel and the cellular principle -- 2.1 Characteristics of the mobile radio channel -- 2.2 Separation of directions and duplex transmission -- 2.2.1 Frequency Division Duplex -- 2.2.2 Time Division Duplex -- 2.3 Multiple access -- 2.3.1 Frequency Division Multiple Access -- 2.3.2 Time Division Multiple Access -- 2.3.3 Code Division Multiple Access -- 2.3.4 Space Division Multiple Access -- 2.4 Cellular principle -- 2.4.1 Definitions -- 2.4.2 Carrier-to-interference ratio -- 2.4.3 Formation of clusters -- 2.4.4 Traffic capacity and traffic engineering -- 2.4.5 Sectorization of cells -- 2.4.6 Spatial filtering for interference reduction (SFIR) -- 3 System architecture and addressing -- 3.1 System architecture -- 3.2 The SIM concept -- 3.3 Addressing -- 3.3.1 International mobile station equipment identity -- 3.3.2 International mobile subscriber identity -- 3.3.3 Mobile subscriber ISDN number -- 3.3.4 Mobile station roaming number -- 3.3.5 Location area identity -- 3.3.6 Temporary mobile subscriber identity -- 3.3.7 Other identifiers -- 3.4 Registers and subscriber data -- 3.4.1 Location registers (HLR and VLR) -- 3.4.2 Security-related registers (AUC and EIR) -- 3.4.3 Subscriber data -- 3.5 Network interfaces and configurations -- 3.5.1 Interfaces -- 3.5.2 Configurations -- 4 Air interface - physical layer -- 4.1 Logical channels -- 4.1.1 Traffic channels -- 4.1.2 Signaling channels -- 4.1.3 Example: connection setup for incoming call -- 4.1.4 Bit rates, block lengths and block distances -- 4.1.5 Combinations of logical channels.
    Note: Description based on publisher supplied metadata and other sources
    Additional Edition: 9780470030707
    Additional Edition: Erscheint auch als Druck-Ausgabe GSM Hoboken, NJ : Wiley, 2009 0470030704
    Additional Edition: 9780470030707
    Language: English
    Subjects: Engineering
    RVK:
    ZN 6550
    Keywords: GSM-Standard
    URL: Volltext  (lizenzpflichtig)
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  • 3
    Online Resource
    Online Resource
    Non-equilibrium in soil hydraulic modelling (18)
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    Details
    UID:
    (DE-627)1859270638
    Format: 9
    ISSN: 1879-2707
    Content: A notorious problem in modelling water dynamics within the unsaturated zone is preferential flow and temporal non-equilibrium between water content and water potential. These phenomena originate from the ubiquitous spatial heterogeneity of soil hydraulic properties and substantially hampers the prediction of solute transport from the soil surface towards groundwater. The characteristic scale of these processes is the soil profile or ‘pedon scale’ where modelling of water dynamics is typically based on the well established Richards equation which has been augmented by various conceptual approaches to represent preferential flow phenomena. In this paper we investigate through numerical case studies hydraulic non-equilibrium during infiltration of water into relatively dry, heterogeneous soil profiles, which is the most prominent scenario where non-equilibrium conditions affect the overall dynamics of water and solutes...
    Note: Gesehen am 12.09.2023
    In: Journal of hydrology, Amsterdam [u.a.] : Elsevier, 1963, 393(2010), 1, Seite 20-28, 1879-2707
    In: volume:393
    In: year:2010
    In: number:1
    In: pages:20-28
    In: extent:9
    Language: English
    DOI: 10.1016/j.jhydrol.2010.03.018
    URL: Volltext  (lizenzpflichtig)
    URL: Volltext  (lizenzpflichtig)
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    BSZ
  • 4
    Book
    Book
    On the necessity of an entry pressure in the Mualem model (2004)
    Heidelberg : IWR
    Details
    UID:
    (DE-627)501436081
    Format: 7 S , graph. Darst , 30 cm
    Series Statement: Preprint / Interdisziplinäres Zentrum für Wissenschaftliches Rechnen der Universität Heidelberg 2004,42
    Note: Auch im Internet unter der Adresse http://www.iwr.uni-heidelberg.de/sfb/Preprints.html verfügbar
    Language: English
    Keywords: Forschungsbericht
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  • 5
    Online Resource
    Online Resource
    GSM switching, services and protocols (2001)
    New York : Wiley
    Details
    UID:
    (DE-627)1679710052
    Format: 1 Online-Ressource (1 online resource)
    Edition: 2nd ed
    ISBN: 047149903X , 0470841745 , 9780471499039 , 9780470841747
    Uniform Title: GSM, Global System for Mobile Communication
    Content: Annotation, Since the publication of the first edition the number of GSM subscribers has exploeded and it is now deployed in more than 140 countries worldwide. Revised and updated GSM Switching, Services and Protocols now features the abundant new services and applications that GSM can provide. By focusing on the fundamentals of the mobile radio systems, it provides an excellent introductory insight to the whole area of GSM cellular radio. By providing an easy-to-follow instructive text, this second edition will have insight appeal to telecommunication engineers, researchers, adn developers. The highly graphical approach and numerous illustrations will also make it an indispensable reference for senior undergraduates and postgraduates in electrical and computer engineering.- Details the GSM phase 2+ services, including new data and speech services and service platforms, such as AMR, ASCI. CAMEL and EFR- Features a brand new chapter on General Packet Radio Service (GPRS)- Contains a completly revised and expanded chapter 'GSM - The story goes on'- Presents new sections on Wireless Application Protocol (WAP) and the migration to UMTS- Includes expaned and updated chapters on Logical Channels and Channel Coding
    Note: Includes bibliographical references and index , Title from title screen
    Additional Edition: 047149903X
    Additional Edition: Erscheint auch als Druck-Ausgabe Eberspächer, J. (Jörg) GSM switching, services and protocols New York : Wiley, ©2001
    Language: English
    DOI: 10.1002/0470841745
    URL: https://onlinelibrary.wiley.com/doi/book/10.1002/0470841745
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  • 6
    Online Resource
    Online Resource
    Quantitative imaging of water flow in soil and roots using neutron radiography and deuterated water (2013)
    Details
    UID:
    (DE-627)76932231X
    Format: Online-Ressource (PDF-Datei: 4,3 MB)
    Content: Wo und wie schnell nehmen Wurzeln Wasser auf? Obwohl diese Frage in Pflanzen- und  Bodenwissenschaften von großer Bedeutung ist, gibt es nur wenige experimentelle Daten darüber, an welcher Stelle der Wurzeln eine transpirierende Pflanze das Wasser aus dem Boden erhält. Die Antwort auf diese Frage erfordert direkte und in-situ Messungen des lokalen Wasserflusses in die Wurzel hinein. Ziel dieser Arbeit war es, eine neue Methode zu entwickeln und anzuwenden, um den lokalen Wasserfluss in unterschiedliche Segmente der Pflanzenwurzeln zu quantifizieren. Dabei wurde Neutronenradiographie eingese...
    Content: Where and how fast do roots take up water? Despite its importance in plant and soil sciences, there is limited experimental information on the location of water uptake along the roots of transpiring plants growing in soil. The answer to this question requires direct and in-situ measurement of the local flow of water into the roots. The aim of this study was to develop and apply a new method to quantify the local fluxes of water into different segments of the roots of intact plants. To this end, neutron radiography was used to trace the transport of deuterated water (D2O) into the roots of l...
    Note: Göttingen, Univ., Diss., 2013
    Additional Edition: Druckausg. Zarebanadkouki, Mohsen Quantitative imaging of water flow in soil and roots using neutron radiography and deuterated water 2013
    Language: English
    Keywords: Hochschulschrift
    URN: urn:nbn:de:gbv:7-11858/00-1735-0000-0001-BBC9-1-4
    URL: Volltext  (kostenfrei)
    URL: Volltext
    URL: Volltext
    URL: Volltext
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  • 7
    Online Resource
    Online Resource
    Combined impact of soil heterogeneity and vegetation type on the annual water balance at the field scale (18)
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    Details
    UID:
    (DE-627)1761735853
    Format: 17
    ISSN: 1539-1663
    Content: The hydraulic behavior of soil is determined by its hydraulic properties and their variability in space. In agricultural soils, this heterogeneity may stem from tillage or may have natural origin. The root distribution of plants will adapt to some extent to this soil heterogeneity. However, the combined impact of soil heterogeneity and root water uptake (RWU) on long-term soil water budgets has not received much attention. Numerical experiments helped identify how soil heterogeneity affects plant transpiration, soil evaporation, and groundwater recharge. Two-dimensional virtual soils with hierarchical heterogeneity, both natural and tillage induced, served as a basis for modeling soil water dynamics for a 10-yr climate record from two weather stations in Germany that vastly differ in annual precipitation. The complex interactions between soil and vegetation were explored by (i) comparing different RWU strategies (depth-, structure-, and time-dependent root profiles), (ii) land use types (perennial grass and annual winter crops), (iii) a combination of textures (silt above sand and sand above loam), and (iv) RWU with or without a compensation mechanism. The simulations were repeated with one-dimensional, effective representations of these virtual soils. In the framework of hydropedology, this study shed some light on the interaction between plants and pedological features and its impact on the macroscopic soil water budget. We demonstrated that land use has a major impact on the annual water balance through the partitioning of evapotranspiration into bare soil evaporation and plant transpiration. Compensational RWU becomes important for the annual water balance when the root zone comprises contrasting materials with respect to water holding capacity. Soil heterogeneity has in fact a minor impact on long-term soil water budgets. As a consequence, the relative contribution of plant transpiration, soil evaporation, and groundwater recharge to the total soil water loss was well reproduced by simulations in one-dimensional effective soil profiles. This advocates the application of one-dimensional soil-atmosphere-vegetation transfer (SVAT) models at larger scales. These findings only hold for assumptions made in our numerical simulations including flat area without lateral flow and no macropore flow.
    Note: Gesehen am 01.07.2021
    In: Vadose zone journal, Hoboken, NJ : Wiley, 2002, 12(2013), 4, Artikel-ID 130053, Seite 1-17, 1539-1663
    In: volume:12
    In: year:2013
    In: number:4
    In: elocationid:130053
    In: pages:1-17
    In: extent:17
    Language: English
    DOI: 10.2136/vzj2013.03.0053
    URL: Volltext  (lizenzpflichtig)
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  • 8
    Online Resource
    Online Resource
    Direct measurement of unsaturated conductivity including hydraulic nonequilibrium and hysteresis (26)
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    Details
    UID:
    (DE-627)1823852432
    Format: 8
    ISSN: 1539-1663
    Content: The unsaturated hydraulic conductivity function is the dominant material property for modeling soil water dynamics. Because it is difficult to measure directly, it is often derived from the water retention characteristic combined with a geometric model of the pore space. In this study, we developed an automated, simple multistep flux (MSF) experiment to directly measure unsaturated conductivities, K(ψm), at a number of water potentials, ψm, using the experimental setup of classical multistep outflow (MSO) experiments. In contrast to the MSO experiment, the MSF experiment measures the conductivity directly at a spatially constant water potential assuming macroscopically homogeneous materials. Additionally, the proposed method reveals the hysteresis of K(ψm) with respect to increasing and decreasing water potentials as well as the temporal dynamics of K(ψm) during transient-flow conditions. This temporal behavior is explained by the dynamics of fluid configurations at the pore scale during drainage and imbibition leading to hydraulic nonequilibrium. It may provoke a systematic underestimation of hydraulic conductivity using inverse optimization of K(ψm) based on classical MSO experiments. The new approach will improve the determination of K(ψm) and it provides an experimental tool to quantify the effects of hydraulic nonequilibrium under transient conditions.
    Note: Gesehen am 29.11.2022
    In: Vadose zone journal, Hoboken, NJ : Wiley, 2002, 10(2011), 2 vom: Mai, Seite 654-661, 1539-1663
    In: volume:10
    In: year:2011
    In: number:2
    In: month:05
    In: pages:654-661
    In: extent:8
    Language: English
    DOI: 10.2136/vzj2010.0074
    URL: Volltext  (lizenzpflichtig)
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  • 9
    AV-Medium
    AV-Medium
    Wilhelm Busch (1990)
    München : Argus-Film
    Details
    UID:
    (DE-627)1570828725
    Format: 10.57 Minuten , VHS
    Series Statement: Kleine Meisterwerke 4/1990 ; 4/1990
    Language: English
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  • 10
    Online Resource
    Online Resource
    Transport of citrate-coated silver nanoparticles in unsaturated sand (29)
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    Details
    UID:
    (DE-627)1699273804
    Format: 9
    ISSN: 1879-1026
    Content: Chemical factors and physical constraints lead to coupled effects during particle transport in unsaturated porous media. Studies on unsaturated transport as typical for soils are currently scarce. In unsaturated porous media, particle mobility is determined by the existence of an air-water interface in addition to a solid-water interface. To this end, we measured breakthrough curves and retention profiles of citrate-coated Ag nanoparticles in unsaturated sand at two pH values (5 and 9) and three different flow rates corresponding to different water contents with 1mM KNO3 as background electrolyte.
    Note: Gesehen am 03.06.2020
    In: The science of the total environment, Amsterdam [u.a.] : Elsevier Science, 1972, 535(2015), Seite 113-121, 1879-1026
    In: volume:535
    In: year:2015
    In: pages:113-121
    In: extent:9
    Language: English
    DOI: 10.1016/j.scitotenv.2015.03.023
    URL: Volltext  (lizenzpflichtig)
    URL: Volltext  (lizenzpflichtig)
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