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  • Earth Resources and Remote Sensing  (2)
  • Polymer and Materials Science  (2)
  • Mathematical Applications in Environmental Science.  (1)
  • 1
    Online Resource
    Online Resource
    Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications (Vol. IV) (2022)
    Cham :Springer International Publishing :
    Details
    Keywords: Environmental sciences Mathematics. ; Mathematical optimization. ; Calculus of variations. ; Computer simulation. ; Oceanography. ; Mathematical Applications in Environmental Science. ; Calculus of Variations and Optimization. ; Computer Modelling. ; Ocean Sciences.
    Description / Table of Contents: Data Assimilation for Chaotic Dynamics -- Multifidelity Data Assimilation for Physical Systems -- Filtering with One-Step-Ahead Smoothing for Efficient Data Assimilation -- Sparsity-Based Kalman Filters for Data Assimilation -- Perturbations by the Ensemble Transform -- Stochastic Representations for Model Uncertainty in the Ensemble Data Assimilation System -- Second-Order Methods in Variational Data Assimilation -- Statistical Parameter Estimation for Observation Error Modelling: Application to Meteor Radars -- Observability Gramian and Its Role in the Placement of Observations in Dynamic Data Assimilation -- Placement of Observations for Variational Data Assimilation: Application to Burgers’ Equation and Seiche Phenomenon -- Analysis, Lateral Boundary, and Observation Impacts in a Limited Area Model -- An Overview of KMA’s Operational NWP Data Assimilation Systems.
    Abstract: This book contains the most recent progress in data assimilation in meteorology, oceanography and hydrology including land surface. It spans both theoretical and applicative aspects with various methodologies such as variational, Kalman filter, ensemble, Monte Carlo and artificial intelligence methods. Besides data assimilation, other important topics are also covered including adaptive observations, sensitivity analysis, parameter estimation and AI applications. The book is useful to individual researchers as well as graduate students for a reference in the field of data assimilation.
    Type of Medium: Online Resource
    Pages: XXI, 705 p. 239 illus., 224 illus. in color. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783030777227
    URL: https://doi.org/10.1007/978-3-030-77722-7
    DOI: 10.1007/978-3-030-77722-7
    DDC: 333.7
    Language: English
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    E-BOOKS (AWI ONLY)
  • 2
    Electronic Resource
    Electronic Resource
    Attempts to modify an electrode with a conducting platinum cluster compound (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 734-737 
    Details
    ISSN: 1040-0397
    Keywords: Platinum cluster ; Modified electrode ; Conducting fibers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A conducting platinum cluster compound K1.64Pt(C2O4)2 was electrochemically synthesized on a glassy carbon electrode through the electrooxidation of K2Pt(C,2O4)2 in an aqueous medium using single potential step and cyclic voltammetry methods. The precursor K2Pt(C2O4)2 was prepared by a ligand exchange reaction between C2O42- and PtCl42-. During single potential step experiments, the electrolytic current corresponding to the oxidation of K2Pt(C2O4)2 increased dramatically after a sharp decrease at the beginning (due to the formation of conducting K1.64Pt(C2O4)2 on the surface of the working electrode). Two kinds of mechanism account for the current transients at the different applied potentials. Cyclic voltammetry was conducted with K1.64Pt(C2O4)2 on the surface of the working electrode and a steady-state diffusion current was observed. Since the material grew in a fibrous manner, each conducting fiber which was in contact with the electrode could serve as an ultramicroelectrods. The behavior of the working electrode was thus changed from a plain to an ultramicroelectrode array.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070808
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Computer prediction of cycle times during rotational molding of plastics (1992)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 11 (1992), S. 181-191 
    Details
    ISSN: 0730-6679
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A computer simulation program has been developed for the rotational molding of plastics. The predictions obtained from this program in terms of heating/cooling rates and overall cycle times have been compared with experimental molding trials with a range of plastics. It is shown that the computer model predicts accurately the real situation for a wide range of processing conditions. In particular, the program allows the effects of oven efficiency, mold material, mold wall thickness, and molded part thickness to be assessed quantitiatively. The article presents information on heat transfer coefficients that are applicable during rotational molding and typical cycle times for a wide range of process conditions. © 1992 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1992.060110302
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  • 4
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    Recent Change of Vegetation Growth Trend in China (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Using satellite-derived normalized difference vegetation index (NDVI) data, several previous studies have indicated that vegetation growth significantly increased in most areas of China during the period 1982-99. In this letter, we extended the study period to 2010. We found that at the national scale the growing season (April-October) NDVI significantly increased by 0.0007/yr from 1982 to 2010, but the increasing trend in NDVI over the last decade decreased in comparison to that of the 1982-99 period. The trends in NDVI show significant seasonal and spatial variances. The increasing trend in April and May (AM) NDVI (0.0013/yr is larger than those in June, July and August (JJA) (0.0003/yr) and September and October (SO) (0.0008/yr). This relatively small increasing trend of JJA NDVI during 1982-2010 compared with that during 1982-99 (0.0012/yr) (Piao et al 2003 J. Geophys. Res.-Atmos. 108 4401) implies a change in the JJA vegetation growth trend, which significantly turned from increasing (0.0039/yr) to slightly decreasing (0:0002/yr) in 1988. Regarding the spatial pattern of changes in NDVI, the growing season NDVI increased (over 0.0020/yr) from 1982 to 2010 in southern China, while its change was close to zero in northern China, as a result of a significant changing trend reversal that occurred in the 1990s and early 2000s. In northern China, the growing season NDVI significantly increased before the 1990s as a result of warming and enhanced precipitation, but decreased after the 1990s due to drought stress strengthened by warming and reduced precipitation. Our results also show that the responses of vegetation growth to climate change vary across different seasons and ecosystems.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC.JA.00434.2012 , Environmental Research Letters; 6; 4
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Canopy Spectral Invariants. Part 1: A New Concept in Remote Sensing of Vegetation (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-08-26
    Description: The concept of canopy spectral invariants expresses the observation that simple algebraic combinations of leaf and canopy spectral reflectance become wavelength independent and determine two canopy structure specific variables the recollision and escape probabilities. These variables specify an accurate relationship between the spectral response of a vegetation canopy to incident solar radiation at the leaf and the canopy scale. They are sensitive to important structural features of the canopy such as forest cover, tree density, leaf area index, crown geometry, forest type and stand age. This paper presents the mathematical basis of the concept which is linked to eigenvalues and eigenvectors of the three-dimensional radiative transfer equation.
    Keywords: Earth Resources and Remote Sensing
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-3073); 112; 4; 727-735
    Format: text
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    NASA TECHNICAL REPORTS
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