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  • 1
    Series available for loan
    Series available for loan
    Expected utilities for decision making and steering of measurement processes (2018)
    Hannover : Fachrichtung Geodäsie und Geoinformatik der Leibniz Universität Hannover
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    Call number: S 99.0139(345)
    In: Wissenschaftliche Arbeiten der Fachrichtung Vermessungswesen der Universität Hannover
    Type of Medium: Series available for loan
    Pages: xiii, 107 Seiten , Illustrationen, Diagramme
    ISSN: 0174-1454
    Series Statement: Wissenschaftliche Arbeiten der Fachrichtung Vermessungswesen der Universität Hannover Nr. 345
    URL: Inhaltsverzeichnis
    Language: English
    Note: Dissertation, Gottfried Wilhelm Leibniz Universität Hannover, 2018 , Introduction 1.1 Motivation and Objectives 1.2 Structure of the work 1.3 Own contributions for solving of the central issues 2 Modelling of measurement uncertainties 2.1 Motivation and overview 2.2 Characteristics of random and systematic uncertainties 2.3 Modelling methods for the uncertainty of measurements 2.3.1 An overview on uncertainty modelling 2.3.2 Probability theory and Bayes' theorem 3 Utility theory 3.1 Fundamentals 3.1.1 Ordinal utility 3.1.2 Cardinal utility 3.1.3 Multi-attribute utility 3.2 Expected Utility 3.2.1 Introduction 3.2.2 Von Neumann-Morgenstern utility theorem 4 Decision making procedures under uncertainty 4.1 Motivation and overview 4.2 Hypothesis testing with measurement uncertainties 4.2.1 Fundamentals 4.2.2 Statistical hypothesis testing 4.3 Decision making under pure uncertainty 4.4 Decision making under risk 4.5 Determination of significance level 4.6 Comparisons of two decision making methods 5 Transferring the methodology to applications 5.1 Motivation 5.2 Applications of two alternatives 5.2.1 Application of Case I 5.2.2 Application of Case II 5.3 Applications extended to u alternatives 5.4 Discussion of results and conclusions 6 Steering of measurement processes 6.1 Motivation 6.2 General process of measurement steering 6.3 Example of a steering application 7 Summary and outlook 7.1 Summary 7.2 Outlook Bibliography Acknowledgement Curriculum Vitae
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Fixed-bed photocatalysts for solar decontamination of water (1994)
    s.l. : American Chemical Society
    Environmental science & technology 28 (1994), S. 435-442 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00052a015
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  • 3
    Electronic Resource
    Electronic Resource
    Comparisons of the Apatite Presentation and Demineralization in Enamel and Cementum by Atomic Force Microscopy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 733-736 
    Details
    ISSN: 1013-9826
    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
    Notes: AFM is used to study tooth surfaces (enamel and cementum) in order to compare thepattern of particle distribution and demineralization process in the two dissimilar tooth hard tissues.Our approach is focusing mainly on the qualitative observations of tooth surface morphology andquantitatively measuring the early stages of mineral loss. The native enamel presented globularparticles tightly packed. After polishing the aprismatic layer, the particles observed were relativelylarger and more organized than ones in the outmost enamel surface. The cementum had small grainsarranged in some degree of ordered packing with varying crystallite orientations. After different timetreatment with citric acid solution, all the sample surfaces became more irregular and had the deepergrooves. The maximum mineral loss was greatest for the cementum sample and lowest for the nativeenamel. The demineralization difference between the enamel and cementum shows the structure andcomponent play important roles in the morphological changes of demineralization. Thesedemonstrate that the microstructure and demineralized difference between enamel and cementumobtained with AFM are complementary to the usual SEM images and TEM data. AFM is suitable formeasuring early stages of tooth surface demineralization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.733.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Biphasic Calcium Phosphate Porous Ceramics Prepared from Fine Powders with Different Particle Size and its Dissolution Behavior in Simulated Body Fluid (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1688-1691 
    Details
    ISSN: 1013-9826
    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
    Notes: Biphasic calcium phosphate (BCP) ceramics, a mixture of hydroxyapatite (HAp) and betatricalciumphosphate (β-TCP), of varying HAp/β-TCP ratios was prepared. One kinds of HAp and onekind of β-TCP powders were used to produce porous BCP bioceramics with HAp/β-TCP weight rationsof 20/80, 40/60, and 80/20. A slip was obtained by adding a mixed powders of HAp and β-TCP to asolution 1.5% of deflocculant and 0.5 wt% of foaming agent. The optimum value for the minimum viscosityin these present slips with respect to its solid loading and the optimum amount of the deflocculantwere investigated. The specimen obtained by casting a polyurethane foam with 1.5 wt% of deflocculantinto a slip, and drying it under vacuum, was heated at 1150°C for 3 hours. The resultant porous BCPsintered body had large spherical pores of 300 /m with interconnecting rectangular voids. Many smallpores in the size range of 2-3 /m or below were observed in the specimen obtained by heating at 1150°Cfor 3 hours. The dissolution test was done as follows. The obtained porous ceramics samples about 0.5gindividually soaked into 30 mL of simulated body fluid (SBF) solution at 36.5°C. The calcium andphosphorous content of the SBF solution was analyzed by ICP. The porous body was dried, andcharacterized using SEM, XRD, and FT-IR
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1688.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Intelligent Tool Condition Monitoring System Based on Rough Sets and Mathematical Morphology (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 722-726 
    Details
    ISSN: 1662-7482
    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
    Notes: The image of cutting tools provides reliable information regarding the extent of tool wear.In this paper, we propose the theory of image processing based on rough sets and mathematicalmorphology to analyzing the flank faces which are chosen as our monitoring object. First, throughplotting the appropriate subset, the rough sets filter is used to enhancement the image of tool wear.Then, the mathematical morphology theory is applied to process the translated binary image. Finally,tool condition monitoring is realized by measuring the area of tool wear. This paper gives thecorresponding monitoring principal and proposes a new algorithm to process the cutting tool image.The algorithm is also flexible and fast enough to be implemented in real time for online tool wear ortool condition monitoring
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.722.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of Bimodal Porous Biphasic Calcium Phosphate Ceramics and Their Dissolution Behavior in Simulated Body Fluid (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 227-230 
    Details
    ISSN: 1662-8985
    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
    Notes: Biphasic calcium phosphate (BCP) ceramics, a mixture of hydroxyapatite (HAp) andbeta-tricalcium phosphate (β-TCP), of varying HAp/β-TCP ratios were prepared from fine powders.Porous BCP ceramic materials with HAp/β-TCP weight rations of 20/80, 40/60, and 80/20 wereprepared. In this study, the bioactivity is reduced at a bigger HAp content rate, which is likely relatedto the high driving pore for the formation of a new phase, and the reaction rate was proportional to theβ-TCP. The porous BCP ceramics having a bigger porosity rate can easily under up dissolution. Thepowder having a bigger β-TCP content rate can easily generate a new phase. The dissolution resultsconfirmed that the biodegradation of calcium phosphate ceramics could be controlled by simplyadjusting the amount of HAp or β-TCP in the ceramics and porosity rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.227.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation and Thermal Property of Phase Change Material Microcapsules by Phase Separation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 2293-2296 
    Details
    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
    Notes: Compared to conventional single-phase fluids, the latent functionally thermal fluid (LFTF),with phase change particles of μm magnitude in size dispersed in it, shows much greater apparentspecific heat and heat transfer rate between the fluid and the duct wall. Therefore, for given heattransportation quantity, the mass flow rate and the pump consumption can be reduced greatly. Due tothese, LFTF is a promising material in the fields of heat exchanging. In this paper, phase changematerial (n-tetradecane) was encapsulated by polymethyl mathacrylate (PMMA), polystyrene (PS)and blend of them by internal phase separation method to form microcapsule of 1~2μm in size. Thechemical structures were demonstrated by using Fourier transform infrared spectroscopy (FTIR). Thecore-shell structure was observed using phase contrast microscope. Differential scanning calometry(DSC) results indicated that the phase change enthalpy of the containing 75wt% n-tetradecane as corematerial reaches 150.7 J/g
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.2293.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of Bimodal Porous Apatite Ceramics through Slip Casting Using Fine Hydroxyapatite Powders (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 723-728 
    Details
    ISSN: 1013-9826
    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
    Notes: A bimodal porous hydroxyapatite (HAp) body with high flexural strength was preparedthrough slip casting. HAp fine powder used in this study was synthesized by wet milling, drying andheating of a mixture of calcium hydrogen phosphate di-hydrate and calcium carbonate. Thesynthesized HAp powder was 0.32[removed info]0.05 μm in size and 38.1[removed info]0.8m2/g in specific surface area. Theslip was prepared by adding deflocculant and foaming reagent. The optimum value for the minimumviscosity in the present HAp slip with respect to its solid loading and the optimum amount of thedeflocculant were studied. The total porosity of the specimens obtained from a slip of 48 wt% HApsolid loading is in the range of 49 – 61vol %, and the resultant porous HAp sintered body had largespherical pores of 300 -m with interconnecting rectangular voids. Many small pores in the size rangeof 2-3 -m or below were observed in the specimen obtained by heating at 1100, and 1200 [removed info]. Theflexural strength of the bimodal porous HAp ceramics sintered at 1200 [removed info]C showed a large value of17.6 MPa, with a porosity of 60.5vol[removed info]
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.723.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Research on the Proper Selection of Soil Constitutive Relation in Modeling Underground Excavation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1358-1363 
    Details
    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
    Notes: Soil is a complex material whose properties are elastic, plastic and viscious. The selectionof a proper constitutive relation is important in the study of stratum movement induced byunderground excavation in modern cities. First, based on the Fast Lagrangian Analysis of Continua(FLAC) method, the elastic response stress (p, q) distribution induced by a circular tunnel is analyzed,and the surrounding soil is divided into four categories: p increase q increase, p increase q decrease, pdecrease q increase, p decrease q decrease according to p-q stress path. The character of p-qdistribution and the plastic zone induced by tunneling in clay are compared when the Mohr-Coulombmodel (M-C), the Drucker-Prager model (D-P) and the Modified Cam-Clay model (C-C) are adopted;the C-C model is considered to be suitable for simulating underground excavation problems. Second,factors such as stratum character, stress path and relative position between soil and excavation arethought to be important in the selection of a proper constitutive relation, accounting for the geologicalcondition of Beijing and measuring techniques being used in geotechnical engineering. Fine grainedsoils such as clay and silt can be modeled by the C-C model. Coarse grained soil, for containing andnot containing excavation, may be represented using the M-C model considering strain softening andthe normal M-C model. Finally, with the aid of FLAC method and its internal language FISH, ascheme of estimating and controlling parameter input is suggested
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1358.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A fast Newton method for entropy maximization in statistical phase estimation (2001)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 681-685 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A fast Newton method is presented for solving the entropy maximization problem in the Bayesian statistical approach to phase estimation. The method requires only O(n \log n) instead of standard O(n^3) floating point operations per iteration, while converging in the same rate as the standard Newton method. The method is described and related computational issues are discussed. Numerical results on simple test cases are also presented to demonstrate the behavior of the method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767301009187
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