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  • 1
    Online Resource
    Online Resource
    Newark :John Wiley & Sons, Incorporated,
    Keywords: Artificial intelligence. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (492 pages)
    Edition: 1st ed.
    ISBN: 9781119771517
    DDC: 621.042028563
    Language: English
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  • 2
    Online Resource
    Online Resource
    Wiesbaden :Springer Vieweg. in Springer Fachmedien Wiesbaden GmbH,
    Keywords: Artificial intelligence. ; Business-Data processing. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (146 pages)
    Edition: 1st ed.
    ISBN: 9783658375997
    DDC: 658.4038028563
    Language: English
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  • 3
    Keywords: Artificial intelligence. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (1341 pages)
    Edition: 1st ed.
    ISBN: 9783030681548
    Series Statement: Advances in Intelligent Systems and Computing Series ; v.1324
    DDC: 016.403
    Language: English
    Note: Intro -- Preface -- Contents -- About the Editors -- Sustainable Clean Energy System -- Adaptive Neuro-Fuzzy Inference Based Modeling of Wind Energy Harvesting System for Remote Areas -- Abstract -- 1 Introduction -- 2 Motivation and Objective of Research -- 3 Related Work -- 4 Wind Energy Harvesting System -- 4.1 Modelling of Wind Turbine -- 4.2 Modeling of the PMSG -- 5 Adaptive Neuro-Fuzzy Inference System -- 6 Simulation Results and Discussion -- 6.1 Limitation of Research -- 7 Conclusion and Future Scope -- Acknowledgments -- References -- Features of Distributed Energy Integration in Agriculture -- Abstract -- 1 Introduction -- 2 Problems of Integration of Distributed Energy Projects in Agriculture -- 3 Discussion and Results -- 4 Conclusions -- References -- Concept of Multi-contact Switching System -- Abstract -- 1 Introduction -- 2 MCSS -- 3 Discussion -- 4 Conclusions -- References -- The Design of Optimum Modes of Grain Drying in Microwave-Convective Effect -- Abstract -- 1 Introduction -- 2 Main Part -- 2.1 Research Method -- 2.2 Experiment -- 2.3 Results and Discussion -- 3 Conclusions -- References -- Isolated Agroecosystems as a Way to Solve the Problems of Feed, Ecology and Energy Supply of Livestock Farming -- Abstract -- 1 Introduction -- 2 Materials and Methods -- 3 Conclusions -- References -- Laboratory-Scale Implementation of Ethereum Based Decentralized Application for Solar Energy Trading -- Abstract -- 1 Introduction -- 2 Implement of DApp Using the Ethereum Open-Source Platform -- 2.1 Set Up the Ethereum Environment -- 2.2 Set Up React -- 2.3 Set Up Identities with Ganache and Wallets with Metamask for Participants -- 3 Implement of ERC20 Token -- 4 Implement Energy Trading -- 4.1 The User Uses ET Token to Do Both Sell Orders and Buy Orders -- 4.2 Trading -- 5 Deployment and Experimental Result -- 6 Conclusion. , References -- Solar Module with Photoreceiver Combined with Concentrator -- Abstract -- 1 Introduction -- 2 Creation of the Geometry of Working Profile of the Paraboloid Type Solar Radiation Concentrator -- 3 Results of Calculating the Profile of the Concentrator Paraboloid Type -- 4 Conclusion -- Acknowledgment -- References -- Modeling of Bilateral Photoreceiver of the Concentrator Photovoltaic Thermal Module -- Abstract -- 1 Introduction -- 2 Three-Dimensional Modeling of Bilateral Photoreceivers of Photovoltaic Thermal Solar Modules -- 3 Modeling and Visualization of the Thermal State of the Bilateral Photoreceiver of the Concentrator Photovoltaic Thermal Module -- 4 Conclusion -- Acknowledgment -- References -- Formation of Surface of the Paraboloid Type Concentrator of Solar Radiation by the Method of Orthogonal Parquetting -- Abstract -- 1 Introduction -- 2 Paraboloid Type Concentrators of the Solar Radiation -- 3 Method of the Orthogonal Parqueting of Surface of the Paraboloid Type Concentrator of the Solar Radiation -- 4 Paraboloid Type Concentrators of the Solar Radiation for Various Photoreceivers -- 5 Conclusion -- Acknowledgment -- References -- Determination of the Efficiency of Photovoltaic Converters Adequate to Solar Radiation by Using Their Spectral Characteristics -- Abstract -- 1 Introduction -- 2 Comparison of the Spectral Densities of Current Photoresponses of a Reference Silicon Photovoltaic Converter Under Various Exposure Conditions -- 3 Averaged Spectral Densities of Power of the Photoactive Part of the Spectrum for Silicon -- 4 Comparison of the Spectral Densities of Current Photoresponses of the Silicon Photovoltaic Converters -- 5 Dependence of the Efficiency of the Silicon Photovoltaic Converter Versus the Wavelength -- 6 Conclusion -- Acknowledgment -- References. , Modeling of the Thermal State of Systems of Solar-Thermal Regeneration of Adsorbents -- Abstract -- 1 Introduction -- 2 Research Problem Statement -- 3 Research Results -- 4 Conclusion -- References -- Economic Aspects and Factors of Solar Energy Development in Ukraine -- Abstract -- 1 Conclusions -- References -- A Method for Ensuring Technical Feasibility of Distributed Balancing in Power Systems, Considering Peer-to-Peer Balancing Energy Trade -- Abstract -- 1 Introduction -- 2 Notion of Power Flow and Its Feasibility -- 3 Proposed Method -- 3.1 Optimal Power Flow Problem (OPF) -- 3.2 Formulation (2) - Identification of Most Problematic Unit -- 3.2.1 Addition of New Constraint -- 3.3 Formulation (3) - Operator's Corrective Actions -- 4 Assessment of the Method -- 4.1 Measure of Market Effectiveness -- 4.2 Simulation Results -- 4.2.1 Numerical Results -- 5 Conclusions and Discussion -- References -- Sustainable Optimization, Metaheuristics and Computing for Expert System -- The Results of a Compromise Solution, Which Were Obtained on the Basis of the Method of Uncertain Lagrange Multipliers to Determine the Influence of Design Factors of the Elastic-Damping Mechanism in the Tractor Transmission -- Abstract -- 1 Introduction -- 2 Purpose of Research -- 3 Materials and Methods -- 4 Discussion Results -- 5 Conclusions -- Acknowledgments -- References -- Multiobjective Lévy-Flight Firefly Algorithm for Multiobjective Optimization -- Abstract -- 1 Introduction -- 2 Multiobjective Lévy-Flight Firefly Algorithm -- 2.1 Original FA Algorithm -- 2.2 LFFA Algorithm -- 2.3 mLFFA Algorithm -- 3 Multiobjective Test Functions -- 4 Results and Discussions -- 5 Conclusions -- References -- Cooperative FPA-ATS Algorithm for Global Optimization -- Abstract -- 1 Introduction -- 2 Cooperative FPA-ATS Algorithm -- 2.1 FPA Algorithm -- 2.2 ATS Algorithm. , 2.3 Cooperative FPA-ATS Algorithm -- 3 Benchmark Functions -- 4 Results and Discussions -- 5 Conclusions -- References -- Bayesian Optimization for Reverse Stress Testing -- Abstract -- 1 Introduction -- 1.1 Problem Statement -- 2 Supporting Literature -- 2.1 Other Optimization Methods -- 3 Bayesian Optimization: Overview -- 3.1 The LCB Acquisition Function -- 4 Changes to LCB Acquisition -- 4.1 Rationalization of the ZERO Acquisition Function -- 4.2 Definition: Run Length -- 5 Results -- 5.1 Discussion -- 6 Conclusion and Future Scope -- Appendix A -- References -- Modified Flower Pollination Algorithm for Function Optimization -- Abstract -- 1 Introduction -- 2 FPA and MoFPA Algorithms -- 2.1 Original FPA Algorithm -- 2.2 Proposed MoFPA Algorithm -- 3 Selected Benchmark Functions -- 4 Results and Discussions -- 5 Conclusions -- References -- Improved Nature-Inspired Algorithms for Numeric Association Rule Mining -- 1 Introduction -- 2 Background Information -- 2.1 Association Rule Mining -- 2.2 Differential Evolution for ARM Using Mixed Attributes -- 3 Improved DE for NARM -- 4 Experiments and Results -- 4.1 Discussion -- 5 Conclusion -- References -- Verification of the Adequacy of the Topological Optimization Method of the Connecting Rod Shaping by the BESO Method in ANSYS APDL System -- Abstract -- 1 Introduction -- 2 Analysis of Publications -- 3 Description of the Developed Optimization Method -- 4 Assessment of the Adequacy of the Developed Method -- 5 Conclusion -- References -- Method for Optimizing the Maintenance Process of Complex Technical Systems of the Railway Transport -- Abstract -- 1 Introduction -- 2 Block Diagram of the Method for Optimizing the Parameters of the Maintenance System -- 3 Monitoring of the Technical Condition of the Technical System -- 4 Automatic Identification System "PALM". , 5 Automation of Obtaining the Necessary Initial Data to Optimize Maintenance Periods -- 6 Set of Operations for Maintenance -- 7 Conclusion -- References -- Optimization of Power Supply System of Agricultural Enterprise with Solar Distributed Generation -- Abstract -- 1 Introduction -- 2 Materials and Methods -- 3 Results and Their Discussion -- 4 Conclusion -- References -- Crack Detection of Iron and Steel Bar Using Natural Frequencies: A CFD Approach -- Abstract -- 1 Introduction -- 2 Mathematical Modeling -- 2.1 Governing Equation -- 2.2 Equation of Free Vibration -- 2.3 Boundary Conditions -- 3 Computational Domain and Mesh Generation -- 4 Numerical Results and Discussion -- 5 Conclusion -- 6 Future Study -- Acknowledgement -- References -- Belief Rule-Based Expert System to Identify the Crime Zones -- Abstract -- 1 Introduction -- 2 Related Works -- 3 Methodology -- 3.1 Crime Zone Prediction -- 3.2 Crime Zone -- 3.3 Purpose of Identifying Crime Zone -- 3.4 Types of Crime Zone -- 3.5 Crime Zone Prediction Techniques -- 3.6 Factors Related to Crime Zone -- 3.7 Design of BRB for Identifying Crime Zone -- 4 Implementation of Expert System -- 4.1 Initial Rule Base for X -- 4.2 User Interface -- 5 Results and Discussion -- 6 Conclusion -- References -- Parameter Tuning of Nature-Inspired Meta-Heuristic Algorithms for PID Control of a Stabilized Gimbal -- 1 Introduction -- 2 Description of the Control System -- 2.1 The Plant -- 2.2 Fitness Function Used for Meta-Heuristic Algorithms -- 3 Nature-Inspired Algorithms -- 3.1 Flower Pollination Algorithm -- 3.2 Teaching-Learning-Based Optimization Algorithm -- 4 Computational Experimental Design -- 5 Results and Discussions -- 5.1 Parameter Optimization -- 5.2 Robustness Analysis -- 5.3 Suggestions for Future Practitioners -- 6 Conclusion -- References. , Solving an Integer Program by Using the Nonfeasible Basis Method Combined with the Cutting Plane Method.
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  • 4
    Keywords: Artificial intelligence. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (360 pages)
    Edition: 1st ed.
    ISBN: 9783030583422
    Series Statement: Lecture Notes in Computer Science Series ; v.12311
    DDC: 006.3
    Language: English
    Note: Intro -- Preface -- Organization -- Invited Talks -- Computing Useful Recommendations: Still Requires Knowledge -- Learning to Compare with Few Data for Personalised Human Activity Recognition -- Contents -- Invited Paper -- Learning to Compare with Few Data for Personalised Human Activity Recognition -- 1 Introduction -- 2 Reasoning with Sensor Data for HAR -- 2.1 HAR Using selfBACK Accelerometer Data -- 2.2 Multi-modal Exercise Recognition with MEx Data -- 2.3 Personalisation with Non-iid Data -- 3 Learning to Personalise with Few Data -- 3.1 Learning to Match -- 3.2 Learning to Relate -- 3.3 Learning to Adapt -- 4 Evaluations -- 4.1 HAR Comparative Study -- 4.2 Discussion -- 5 Conclusion -- References -- Technical Session: Workflows -- A*-Based Similarity Assessment of Semantic Graphs -- 1 Introduction -- 2 Background -- 2.1 Semantic Graphs -- 2.2 Approaches to Similarity Assessment of Multi-labeled Graphs -- 2.3 Semantic Graph Similarity Following the Local-Global Principle -- 2.4 A*-Based Similarity Search -- 3 Improving the A*-Based Similarity Search -- 3.1 Search Space Reduction -- 3.2 Adaptive Mapping Orientation -- 3.3 More Informed Heuristic -- 3.4 Heuristic-Based Element Selection -- 4 Experimental Evaluation -- 4.1 Similarity Computation with Ensured Optimality -- 4.2 Similarity Computation Without Ensured Optimality -- 5 Conclusion and Future Work -- References -- A Time-Series Similarity Measure for Case-Based Deviation Management to Support Flexible Workflow Execution -- 1 Introduction -- 2 Deviation Management for Flexible Workflows -- 2.1 Workflow Flexibility -- 2.2 Constraint-Based Workflow Engine -- 2.3 Case-Based Deviation Management -- 3 Similarity Measures for Time Series -- 3.1 Dynamic Time Warping -- 3.2 Smith-Waterman-Algorithm -- 3.3 Weighted Vector Similarity -- 4 Similarity Measure for Deviating Workflows. , 4.1 Characteristics of Similarity for Deviating Workflows -- 4.2 Pre-processing of the Case Base -- 4.3 Similarity Assessment -- 5 Evaluation -- 6 Conclusion and Future Work -- References -- Process Trace Classification for Stroke Management Quality Assessment -- 1 Introduction -- 2 Related Work -- 3 Medical Process Trace Classification -- 3.1 Classification Through Semantic Trace Comparison -- 3.2 Deep Learning Classification -- 4 Experimental Results -- 4.1 Semantic Trace Comparison: Classification Results -- 4.2 Deep Learning: Classification Results -- 5 Discussion and Conclusions -- References -- Technical Session: Applications in Health -- Using Case-Based Reasoning to Predict Marathon Performance and Recommend Tailored Training Plans -- 1 Introduction -- 2 Related Work -- 3 A CBR Approach to Marathon Training -- 3.1 From Training/Workout Sessions to Cases -- 3.2 Task 1: Predicting Goal Race-Times -- 3.3 Task 2: Recommending Tailored Training Programmes -- 3.4 From Single Weeks to Multiple Weeks -- 4 Evaluation -- 4.1 Setup -- 4.2 Prediction Error by Training Week -- 4.3 Prediction Stability -- 4.4 Prediction Error by Ability -- 4.5 Evaluating Training Plan Recommendations -- 5 Conclusions -- References -- Classifying Breast Cancer Tissue Through DNA Methylation and Clinical Covariate Based Retrieval -- 1 Introduction -- 2 Background -- 2.1 Research Background -- 3 Methods -- 3.1 Data Preprocessing -- 3.2 System Overview -- 3.3 Distance Measures -- 3.4 Retrieval Framework -- 3.5 Feature Selection -- 4 Results -- 4.1 Test for Confounding Clinical Variables -- 4.2 Classification Tasks -- 4.3 First Task: Cancer Classification -- 4.4 Second Task: Cancer Subtype -- 4.5 Initial Findings -- 4.6 Effect of Clinical Covariate Integration -- 4.7 Case Refinement for Subtype Classification -- 5 Discussion -- References. , A New Adaptation Phase for Thresholds in a CBR System Associated to a Region Growing Algorithm to Segment Tumoral Kidneys -- 1 Introduction -- 2 Related Work -- 3 Materials and Methods -- 3.1 COLISEUM-3D -- 3.2 CBR System for Segmentation of Pathological Kidney -- 3.3 Adaptation Phase -- 4 Results -- 4.1 Database, Initial Hypothesis and Conditions, and Evaluation Process -- 4.2 Determination of Optimal Weights -- 4.3 Comparaison with OV2ASSION Approach for Segmentation of Tumoral Kidneys -- 5 Discussion and Future Work -- 6 Conclusion -- References -- Predicting the Personal-Best Times of Speed Skaters Using Case-Based Reasoning -- 1 Introduction -- 2 An Introduction to Speed Skating -- 2.1 The Anatomy of Speed Skating: Skaters and Races -- 2.2 The Importance of Pacing -- 2.3 The Dutch Speed Skating Data Set -- 2.4 Research Questions -- 3 Predicting Track-Specific Race-Times -- 3.1 From Races to Cases -- 3.2 Adapting for Track Variations -- 3.3 Generating Predictions -- 4 Evaluation -- 4.1 Data and Methodology -- 4.2 Prediction Error vs k -- 4.3 Best Performers -- 4.4 On Gender and Age -- 5 Conclusions -- References -- Technical Session: New Paradigms -- Clood CBR: Towards Microservices Oriented Case-Based Reasoning -- 1 Introduction -- 2 Related Work in CBR Development Architectures -- 3 Microservices Design Paradigm for CBR -- 3.1 Clood Architecture -- 3.2 The Casebase -- 3.3 Local Similarity -- 3.4 Global Similarity -- 3.5 Implication for CBR Cycle -- 4 Clood CBR System -- 4.1 Casebase Using Elasticsearch -- 4.2 Clood Similarity Functions -- 4.3 REST API -- 4.4 Clood CBR Dashboard -- 5 Evaluation -- 5.1 Experimental Setup and Dataset -- 5.2 Results and Discussion -- 6 Conclusion -- References -- Holographic Case-Based Reasoning -- 1 Introduction -- 2 Holographic Systems -- 3 Holographic CBR -- 4 Realization of a Holographic Reasoner. , 5 Discussion and Related Work -- 6 Conclusion -- References -- Technical Session: Explanations -- Good Counterfactuals and Where to Find Them: A Case-Based Technique for Generating Counterfactuals for Explainable AI (XAI) -- 1 Introduction -- 2 Counterfactual Explanation: Promise, Problems and Prospects -- 2.1 Counterfactual Promise -- 2.2 Counterfactual Problems -- 2.3 CBR's Prospects for Counterfactuals -- 3 Experiment 1: Plotting Counterfactual Potential -- 3.1 Method: Data Sets and Procedure -- 3.2 Results and Discussion -- 4 A Case-Based Technique for Good Counterfactuals -- 4.1 Explanatory Competence -- 4.2 Leveraging Counterfactual Cases for Explanation -- 4.3 A Case-Based Approach to Generating Good Counterfactuals -- 5 Experiment 2: Evaluating Explanation Competence -- 5.1 Method: Data and Procedure -- 5.2 Results and Discussion: Explanatory Competence -- 5.3 Results and Discussion: Counterfactual Distance -- 6 Conclusions and Future Directions -- References -- CBR-LIME: A Case-Based Reasoning Approach to Provide Specific Local Interpretable Model-Agnostic Explanations -- 1 Introduction -- 2 Related Work -- 3 Background -- 4 The CBR-LIME Method -- 4.1 Case Base Elicitation -- 4.2 Case-Based Explanation -- 5 Evaluation -- 5.1 Offline Evaluation -- 5.2 Online Evaluation with Users -- 6 Conclusions and Future Work -- References -- A User-Centric Evaluation to Generate Case-Based Explanations Using Formal Concept Analysis -- 1 Introduction -- 2 Related Work -- 3 Explanation System -- 3.1 Matrix Factorization Recommender System -- 3.2 Retrieving Explanatory Items -- 3.3 Generating Explanations Using FCA -- 4 User-Centric Evaluation -- 4.1 Data -- 4.2 Experimental Setup -- 4.3 Results -- 5 Conclusions and Future Work -- References -- Technical Session: Deep learning. , Improved and Visually Enhanced Case-Based Retrieval of Room Configurations for Assistancepg in Architectural Design Education -- 1 Introduction -- 2 Concepts and Foundations of the System -- 2.1 Artificial Intelligence Methods -- 2.2 Room Configuration -- 2.3 Architectural Room Zones -- 2.4 Zoned Connection Map -- 3 Combined Retrieval + UI System -- 3.1 Data Augmentation -- 3.2 Context-Based Preselection of Cases -- 3.3 Graph Matching -- 3.4 User Interface: RoomConf Editor -- 4 Evaluation -- 4.1 Quantitative Analysis -- 4.2 User Study -- 4.3 General Results -- 4.4 Feedback on Use in Education -- 5 Conclusion and Future Work -- References -- Using Siamese Graph Neural Networks for Similarity-Based Retrieval in Process-Oriented Case-Based Reasoning -- 1 Introduction -- 2 Foundations and Previous Work -- 2.1 Semantic Workflow Representation -- 2.2 Similarity Assessment -- 2.3 MAC/FAC Retrieval for POCBR -- 3 Similarity Learning for Workflow Graphs with Siamese Graph Neural Networks -- 3.1 Encoding Semantic Graphs for Similarity Learning -- 3.2 Similarity Learning for Workflow Graphs -- 3.3 Siamese GNN-Based Workflow Retrieval -- 4 Experimental Evaluation -- 4.1 Experimental Setup -- 4.2 Experimental Results -- 5 Conclusion and Future Work -- References -- Applying Class-to-Class Siamese Networks to Explain Classifications with Supportive and Contrastive Cases -- 1 Introduction -- 2 Background -- 2.1 The Class-to-Class (C2C) Approach -- 2.2 Siamese Networks -- 2.3 Explanation by Cases in CBR -- 3 Class-to-Class Siamese Networks -- 3.1 Benefits of the C2C-SN Approach -- 3.2 Building a C2C-SN -- 4 Experiments -- 4.1 Classification Accuracy of Pairs -- 4.2 One-Shot Learning -- 4.3 Explanation by Cases -- 4.4 Finding Prototypical Cases -- 4.5 Using Prototypical Cases in Classification of a Case -- 5 Additional Results and Future Directions -- 6 Conclusion. , References.
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  • 5
    Publication Date: 2023-12-19
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The MErcury Radiometer and Thermal Infrared Spectrometer instrument onboard the BepiColombo spacecraft is designed to investigate Mercury’s surface in the mid‐infrared (mid‐IR). Based on MESSENGER data and modeling, Mercury is thought to be evolved under highly reducing conditions (e.g., McCubbin et al., 2017, 〈ext-link ext-link-type="uri" xlink:href="https://doi.org/10.1002/2017JE005367"〉https://doi.org/10.1002/2017JE005367〈/ext-link〉; Namur & Charlier, 2017, 〈ext-link ext-link-type="uri" xlink:href="https://doi.org/10.1038/ngeo2860"〉https://doi.org/10.1038/ngeo2860〈/ext-link〉). The modeling also indicates that Mercury's surface is rich in feldspar. However, it is unknown if reducing conditions during the emplacement of volcanic melts have an influence on the IR properties of feldspars. Therefore, we investigated basaltic samples from the Bühl quarry in northern Hesse, Germany, that evolved under reducing conditions in the mid‐IR and compared the spectra with samples that experienced more oxidizing conditions during their formation. The Bühl samples are feldspar‐rich and contain metallic iron in some areas. Our investigations show that there are no differences between feldspars that formed under different oxidizing conditions. All spectral properties could be explained by well‐known factors that affect mid‐IR spectra of silicates.〈/p〉
    Description: Plain Language Summary: ESA's and Japan Aerospace Exploration Agency’s spacecraft BepiColombo is equipped, beside other instruments, with a thermal infrared (IR) radiometer and spectrometer called MErcury Radiometer and Thermal Infrared Spectrometer (MERTIS). For the accurate interpretation of the data from the MERTIS instrument, laboratory analog material is necessary. This analog material must fulfill different characteristics, such as different chemical and mineralogical compositions. Another not yet studied property is the availability of oxygen during the formation of the minerals. Depending on how much oxygen is available, different minerals form. However, this is an important feature, because Mercury is thought to have evolved under highly reducing conditions, as opposed to Earth where nearly all material formed significant more oxidizing conditions. One phase that is strongly associated with reducing magma formation conditions is metallic iron. There are only few natural outcrops on Earth, were stronger reducing conditions were present so that metallic iron could be formed. One of these outcrops is the Bühl quarry in northern Hesse, Germany. From there we used different samples to analyze the effect of oxygen availability on mid‐IR spectra of plagioclase feldspars.〈/p〉
    Description: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉We present infrared spectra of basaltic samples from the Bühl, Hesse, Germany in preparation of the MERTIS experiment〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Comparison of feldspars formed at different oxygen fugacities showed no spectral differences〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉This is an important result for MERTIS, which will investigate Mercury that formed under reducing conditions〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Description: DLR
    Description: http://bc-mertis-pi.uni-muenster.de/
    Keywords: ddc:549 ; infrared reflectance spectroscopy ; feldspars ; Bühl basalt ; reducing conditions ; Mercury ; MERTIS
    Language: English
    Type: doc-type:article
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  • 6
    Publication Date: 2023-06-23
    Description: Feldspars are major components of terrestrial planetary surfaces. For future space application and the setup of a comprehensive reference database, Na- and K-rich alkali feldspars, NaAlSi3O8 – KAlSi3O8, have been investigated by infrared reflectance spectroscopy. We related the feldspar spectra to the chemical composition and state of Al,Si order/disorder. The infrared measurements were analyzed with respect to band shifts and peak shapes using the autocorrelation function. Natural samples served as starting materials. Some samples were treated by the alkali exchange method to produce pure end-members, which were then heated to generate various states of Al,Si disorder. X-ray diffraction (XRD) methods served to determine the Al,Si distribution. Our autocorrelation allowed to differentiate between the compositional and the order/disorder influences seen in the spectra in the wavelength range between 7 μm up to 14 μm (1429 cm− 1 to 714 cm− 1). Space missions often analyze the surfaces of planetary bodies using remote sensing. Therefore, our results are essential to characterize and distinguish alkali feldspars on the surfaces of terrestrial planetary bodies like Mercury.
    Description: Deutsches Zentrum für Luft- und Raumfahrt https://doi.org/10.13039/501100002946
    Keywords: ddc:549 ; Alkali feldspars ; Infrared spectroscopy ; X-ray diffraction ; Al,Si distribution
    Language: English
    Type: doc-type:article
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  • 7
    Publication Date: 2023-01-13
    Description: Massif‐type anorthosite and comagmatic associations of rutile‐bearing ilmenitite (RBI) and oxide‐apatite‐rich amphibolite (OARA) from the Chiapas Massif Complex (CMC) in southeastern Mexico display a protracted billion‐year accessory mineral record encompassing magmatic crystallization at c. 1.0 Ga to recent ductile shear deformation at c. 3.0 Ma. Multiple discrete zircon populations between these age end‐members resulted from neoformation/recrystallization during local to regional metamorphism that affected the southeastern portion of the CMC. The ubiquitous presence of relict baddeleyite (ZrO2), along with various zircon generations spatially associated with pristine to partly retrogressed Zr‐bearing igneous and metamorphic minerals (e.g., ilmenite, rutile, högbomite and garnet), suggests significant Zr diffusive re‐equilibration (exsolution) during slow cooling and mineral breakdown followed by crystallization of baddeleyite. The subsequent transformation of baddeleyite into zircon was likely driven by reaction with Si‐bearing fluids in several geochronologically identified metamorphic stages. Strikingly contrasting compositional signatures in coeval zircon from anorthosite (silicate‐dominated) and comagmatic RBI (Ti‐Fe‐oxide‐dominated) indicate a major role of fluids locally equilibrating with the rock matrix, as indicated by distinct zircon trace element and oxygen isotopic compositions. A high‐grade metamorphic event at c. 950 Ma is likely responsible for the formation of coarse‐grained rutile (~0.1–10 mm in diameter), srilankite, zircon and garnet with rutile inclusions as well as metamorphic högbomite surrounding Fe‐Mg spinel. Zr‐in‐rutile minimum temperatures suggest 〉730°C for this event, which may correlate to rutile‐forming granulite facies metamorphism in other Grenvillian‐aged basement rocks in Mexico and northern South America. A younger generation of baddeleyite exsolution occurred during post‐peak cooling of coarse‐grained rutile, reflected in rimward Zr depletion and formation of discontinuous baddeleyite coronas. Baddeleyite around rutile was then transformed into zircon possibly during subsequent metamorphism at c. 920 or 620 Ma, resulting from syn‐kinematic and contact metamorphism, respectively. Regional metamorphism at c. 450 and 250 Ma extensively overprinted the existing zircon population, especially during the Triassic event, as suggested by a significant presence of zircon with this age. Nearly pristine baddeleyite occurring interstitial to ilmenite yielded an isochron age of c. 232 Ma according to in situ U–Pb secondary ion mass spectrometry (SIMS), suggesting either formation during metamorphic peak conditions or post‐peak cooling. Zircon with ages of c. 80–100 Ma in anorthosite is identified for the first time within the CMC and coincides with cooling ages of c. 100 Ma for coarse‐grained rutile. This age is similar to those of rocks occurring ~200 km further to the east in Guatemala, which are also bounded to the Polochic fault system but overprinted by eclogite facies metamorphism. A high‐pressure event in the southern CMC after 200 Ma, however, is presently unsupported. Although the abundance of rutile and ilmenite is unusually high in the CMC anorthosite assemblage compared with common igneous rocks, the reactions documented here nonetheless stress the importance of these phases for generating Zr‐bearing accessory minerals over a wide range of metamorphic conditions.
    Description: Consejo Nacional de Ciencia y Tecnología (CONACYT) http://dx.doi.org/10.13039/501100003141
    Description: Deutsche Forschungsgemeinschaft (DFG)
    Keywords: ddc:549 ; Diffusion ; SIMS ; Srilankite ; Ti‐Fe deposits ; Ti‐in‐zircon ; Zr‐in‐rutile
    Language: English
    Type: doc-type:article
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