11 results for "Holger Class"
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Journal Article
A Hydro-Geomechanical Porous-Media Model to Study Effects of Engineered Carbonate Precipitation in Faults
Hydro-geomechanical models are required to predict or understand the impact of subsurface engineering applications such as gas storage in geological formations. This study focuses on engineered carbonate precipitation through biomineralization in a fault zone of a cap-rock, aiming to reduce gas…
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Journal Article Full text
Thermochemical Heat Storage in a Lab-Scale Indirectly Operated CaO/Ca(OH)2 Reactor—Numerical Modeling and Model Validation through Inverse Parameter Estimation
Calcium oxide/Calcium hydroxide can be utilized as a reaction system for thermochemical heat storage. It features a high storage capacity, is cheap, and does not involve major environmental concerns. Operationally, different fixed-bed reactor concepts can be distinguished; direct reactor are…
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Journal Article
A flexible Raspberry Pi-based data logger platform for Modbus sensors with Ansible deployment
This article presents LibrePiLogger, an open-source data logging platform based on the Raspberry Pi for environmental monitoring using Modbus sensors over RS-485. The system combines the AtmosPyre Python library for sensor communication with Ansible-based deployment automation, allowing researchers…
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Journal Article
A New Simulation Framework for Soil–Root Interaction, Evaporation, Root Growth, and Solute Transport
We have developed a general model concept and a flexible software framework for the description of plant-scale soil–root interaction processes including the essential fluid mechanical processes in the vadose zone. The model was developed in the framework of non-isothermal, multiphase…
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Journal Article
Measuring carbonate dissolution rates under well-controlled conditions for reactive CO2-water flow in a large lab-scale karst fracture imitate
This study explores the carbonate dissolution dynamics in karstic systems by simulating reactive water flow under controlled large lab-scale laboratory conditions.Using a 1 m² Jura limestone tile, the experiments focus on carbonate dissolution in fractures under variable parameters, including CO2…
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Journal Article
Machine learning assists in increasing the time resolution of X-ray computed tomography applied to mineral precipitation in porous media
Abstract Many subsurface engineering technologies or natural processes cause porous medium properties, such as porosity or permeability, to evolve in time. Studying and understanding such processes on the pore scale is strongly aided by visualizing the details of geometric and morphological changes…
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Journal Article Full text
Seasonal Dynamics of Gaseous CO2 Concentrations in a Karst Cave Correspond with Aqueous Concentrations in a Stagnant Water Column
Dissolved CO2 in karst water is the key driving force of karstification. Replenishment of CO2 concentrations in karst water occurs by meteoric water that percolates through the vadose zone, where CO2 produced from microbial activity is dissolved. CO2 can thus be transported with the percolating…
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Journal Article
Heat transport from atmosphere through the subsurface to drinking‐water supply pipes
Abstract Drinking‐water quality in supply pipe networks can be negatively affected by high temperatures during hot summer months due to detrimental bacteria encountering ideal conditions for growth. Thus, water suppliers are interested in estimating the temperature in their distribution networks…
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Journal Article Full text
A Numerical Model for Enzymatically Induced Calcium Carbonate Precipitation
Enzymatically induced calcium carbonate precipitation (EICP) is an emerging engineered mineralization method similar to others such as microbially induced calcium carbonate precipitation (MICP). EICP is advantageous compared to MICP as the enzyme is still active at conditions where microbes, e.g…
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Journal Article
Anthropogenic Trace Compounds (ATCs) in aquatic habitats — Research needs on sources, fate, detection and toxicity to ensure timely elimination strategies and risk management
Anthropogenic Trace Compounds (ATCs) that continuously grow in numbers and concentrations are an emerging issue for water quality in both natural and technical environments. The complex web of exposure pathways as well as the variety in the chemical structure and potency of ATCs represents immense…
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Journal Article
Building bridges between disciplines: a generalized mathematical framework for talking quantitative risk assessment
Different perspectives of risk and approaches to risk assessment exist, which complicate communication, methodological advances and management across disciplines. To help building bridges, we have developed, tested and applied a generalized mathematical framework for risk assessment in a unique…