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  • English  (52)
  • Wiley Online Library  (52)
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  • 11
    Language: English
    In: Permafrost and Periglacial Processes, July 2005, Vol.16(3), pp.277-290
    Description: Minkowski densities and density functions are measures for quantifying arbitrary binary patterns. They are employed here to describe permafrost patterns obtained from aerial photographs. We demonstrate that images taken at two neighbouring sites shown distinctly different patterns and quantify the difference. It is found that one of the sites exhibits an essentially single‐scale structure while the other one has a multiscale organization. Minkowski densities and density functions are thus proposed as sensitive and objective measures to quantify the change of permafrost patterns in space or in time. Copyright © 2005 John Wiley & Sons, Ltd.
    Keywords: Permafrost ; Patterned Ground ; Density Functions
    ISSN: 1045-6740
    E-ISSN: 1099-1530
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  • 12
    Language: English
    In: Biometrical Journal, 1993, Vol.35(6), pp.661-675
    Description: In soil micromorphology fissures are considered in vertical sections. To get information about the properties of the soil the joint distribution of spatial direction and width of these fissures is of interest. The fissures are mathematically generalized to flat bodies which are defined as stationary weighted surface processes with the weight “thickness”. In a typical point of the surface process suitable, joint parametric distributions of direction and thickness are assumed. The parameters have to be estimated from measurements on vertical sections which are taken from the soil. On these sections only a visible thickness and a visible angle can be observed. The joint distribution of these variables can be expressed by the joint distribution of spatial direction and thickness with the same parameters and in this indirect way the parameters can be estimated. The paper describes how to randomize the vertical section and how to measure the visible variables on the sections. The Chi‐Square method is proposed for the parameter estimation. Further it is discussed how to derive good starting values for the numerical procedure. All this is demonstrated in a simulation study using the Bingham‐Mardia distribution for the direction and the lognormal distribution for the thickness including a way to correlate the mean thickness and the direction. Finally an application in soil micromorphology is demonstrated for one soil horizon.
    Keywords: Weighted Surface Processes ; Stereology ; Vertical Sections ; Bingham‐Mardia Distribution ; Soil Micromorphology ; Distribution Of Fissures
    ISSN: 0323-3847
    E-ISSN: 1521-4036
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  • 13
    Language: English
    In: Eos, Transactions American Geophysical Union, 11/25/2008, Vol.89(48), pp.490-490
    Description: Both soil science and hydrology are at a critical threshold of exploring breakthroughs. Synergies are expected by bridging classical pedology with soil physics, hydrology, geomorphology, and other related bio‐ and geo‐sciences to address complex soil and water interactions across spatiotemporal scales. Holistic study of the Earth's critical zone (i.e., the critical interface between the surficial solid Earth and its fluid envelopes, which ranges from the top of vegetation to the bottom of aquifers) demands interdisciplinary systems approaches to tackle a wide array of environmental, ecological, agricultural, geological, and natural resource issues of societal importance. In this spirit, and aiming to advance the emerging field of hydropedology, the first international conference on hydropedology was held at Pennsylvania State University (Penn State) with the theme “Water and Soil: Key to Sustaining the Earth's Critical Zone.” The International Union of Soil Sciences' Working Group on Hydropedology organized this meeting, with main sponsorships from the U.S. Department of Agriculture's National Research Initiative and Penn State.
    ISSN: Eos, Transactions American Geophysical Union
    E-ISSN: 00963941
    E-ISSN: 23249250
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  • 14
    In: Water Resources Research, May 2006, Vol.42(5), pp.n/a-n/a
    Description: This paper presents a vision that advocates hydropedology as an advantageous integration of pedology and hydrology for studying the intimate relationships between soil, landscape, and hydrology. Landscape water flux is suggested as a unifying precept for hydropedology, through which pedologic and hydrologic expertise can be better integrated. Landscape water flux here encompasses the source, storage, flux, pathway, residence time, availability, and spatiotemporal distribution of water in the root and deep vadose zones within the landscape. After illustrating multiple knowledge gaps that can be addressed by the synergistic integration of pedology and hydrology, we suggest five scientific hypotheses that are critical to advancing hydropedology and enhancing the prediction of landscape water flux. We then present interlinked strategies for achieving the stated vision. It is our hope that by working together, hydrologists and pedologists, along with scientists in related disciplines, can better guide data acquisition, knowledge integration, and model‐based prediction so as to advance the hydrologic sciences in the next decade and beyond.
    Keywords: Catchment Hydrology ; Landscape Processes ; Scale ; Soil Hydrology ; Soil Physics ; Vadose Zone
    ISSN: 0043-1397
    E-ISSN: 1944-7973
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  • 15
    In: Water Resources Research, August 2019, Vol.55(8), pp.6653-6672
    Description: —a key process for water exchange between soil and atmosphere—is controlled by internal water fluxes and surface vapor fluxes. Recent studies demonstrated that the dynamics of the water flow in corners determine the time behavior of the evaporation rate. The internal water flux of the porous media is often described by capillary flow assuming . Particularly, the crucial influence of , that is, the nonlinear dependency of the capillary flow has been neglected so far. The focus of the paper is to demonstrate that SiO‐surfaces can exhibit contact angles of about 40°. This reduces the internal capillary flow by 1 order of magnitude compared to complete wetting. First, we derived the contact angle by inverse modeling. We conducted a series of evaporation experiments in a 2‐D square lattice microstructure connected by lognormal distributed throats. We used an explicit analytical power series solution of the single square capillary model. A contact angle of 38° ± 1° was derived. Second, we directly measured the contact angle of the Si‐SiO wafer using the Drop Shape Analyzer Krüss 100 and obtained an averaged contact angle of 42° ± 2°. The results support the single square capillary model as an appropriate model for the description of the evaporation process in an ideal square capillary. Evaporation rate dependence on contact angle and temperature: Influence of capillary, viscous, and gravitational forces Visualization micromodel experiments of corner flow: Micromodels produced by a new interval‐based ICP‐DRIE technology Analytical solution for 1‐D corner flow and analysis of the fluid‐fluid patterns and geometric characteristics of the evaporation process
    Keywords: Water Flow ; Silicon Dioxide ; Water Exchange ; Surfaces ; Internal Water ; Power Series ; Water Exchange ; Soil Water ; Evaporation ; Contact Angle ; Dependence ; Evaporation Rate ; Water Flow ; Water Exchange ; Microstructure ; Evaporation ; Porous Media ; Porous Media ; Silica ; Evaporation ; Water Flow ; Capillary Flow ; Atmospheric Models ; Wetting ; Silicon Dioxide ; Fluxes ; Soils ; Evaporation ; Evaporation Rate ; Water Exchange ; Contact Angle;
    ISSN: 0043-1397
    E-ISSN: 1944-7973
    Source: John Wiley & Sons, Inc.
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  • 16
    Book
    Book
    Chichester, UK: John Wiley & Sons, Ltd
    Language: English
    Description: Since the publication of the first edition the number of GSM subscribers has exploded 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...
    Keywords: Global system for mobile communications; Mobile communication systems; Wireless communication systems;
    ISBN: 9780471499039
    ISBN: 047149903X
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  • 17
    Book chapter
    Book chapter
    Chichester, UK: John Wiley & Sons, Ltd
    Language: English
    In: GSM – Architecture, Protocols and Services, Chapter refs, p.313-315
    ISBN: 9780470030707
    Source: John Wiley & Sons, Inc.
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  • 18
    Book chapter
    Book chapter
    Chichester, UK: John Wiley & Sons, Ltd
    Language: English
    In: GSM – Architecture, Protocols and Services, Chapter fmatter, p.i-xi
    Description: the prelims comprise: half‐title page title page copyright page table of contents preface
    ISBN: 9780470030707
    Source: John Wiley & Sons, Inc.
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  • 19
    Language: English
    In: GSM – Architecture, Protocols and Services, Appendices, Chapter app1, p.271-293
    Description: this appendix contains sections titled: reference configuration overview of data communication service selection at transitions between networks bit rate adaptation asynchronous data services synchronous data services teleservices: fax
    ISBN: 9780470030707
    Source: John Wiley & Sons, Inc.
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  • 20
    Language: English
    In: GSM – Architecture, Protocols and Services, Appendices, Chapter app2, p.295-304
    Description: this appendix contains sections titled: objectives of gsm nm telecommunication management network tmn realization in gsm networks
    ISBN: 9780470030707
    Source: John Wiley & Sons, Inc.
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