Explanipedia

Current research on aquifer thermal energy storage (ATES) in Germany Open

Ruben Stemmle, Alireza Arab, Sebastian Bauer, Christof Beyer, Guido Blöcher , et al. · 2025

Characterization of artesian flow and heat transition in an ATES research wellbore using DTS monitoring and numerical modelling Open

Liang Pei, Lioba Virchow, Guido Blöcher, Stefan Kranz, Ali Saadat · 2024

In the practice of Aquifer Thermal Energy Storage (ATES), the hydraulic connection to the wellbore of any other aquifers besides the planned thermal storage should be identified and prohibited in order to operate the ATES system in a susta…

Contextual Breach: Assessing the Robustness of Transformer-based QA Models Open

Ali Saadat, Nahian Ibn Asad, Md Farhan Ishmam · 2024

Contextual question-answering models are susceptible to adversarial perturbations to input context, commonly observed in real-world scenarios. These adversarial noises are designed to degrade the performance of the model by distorting the …

Analysis of Wellbore Integrity using DTS Monitoring and Numerical Modelling in the Practice of ATES Open

Guido Blöcher, Liang Pei, Stefan Kranz, Christian Cunow, Lioba Virchow , et al. · 2024

Surplus heat as stored in an ATES (Aquifer Thermal Energy Storage) system in summer could partly meet the increasing demand of energy in winter. Better assessment on the wellbore integrity permits sustainable operation of such systems. The…

The realization of a high-temperature ATES in Berlin: from explorational drilling to implementation in Berlin-Adlershof Open

Ben Norden, Stefan Kranz, Guido Blöcher, Simona Regenspurg, Lioba Virchow , et al. · 2024

Concepts for achieving sustainable energy provision in urban areas require also an appropriate exploration concept for a succesful planning of a possible site-development. Geophysical exploration data and deep reaching boreholes are common…

Best practices for characterization of High Temperature-Aquifer Thermal Energy Storage (HT-ATES) potential using well tests in Berlin (Germany) as an example Open

Guido Blöcher, Simona Regenspurg, Stefan Kranz, Martin Lipus, Liang Pei , et al. · 2023

Application of Aquifer Thermal Energy Storage with High Temperatures (HT-ATES) ranging from 60-90 • C is a promising technique to store large amounts of energy in urban areas. However, these areas typically lack information on hydrogeologi…

Constrained Bayesian Optimization Using a Lagrange Multiplier Applied to Power Transistor Design Open

Ping-Ju Chuang, Ali Saadat, Sara Ghazvini, Hal Edwards, William G. Vandenberghe · 2023

We propose a novel constrained Bayesian Optimization (BO) algorithm optimizing the design process of Laterally-Diffused Metal-Oxide-Semiconductor (LDMOS) transistors while realizing a target Breakdown Voltage (BV). We convert the constrain…

Assessment of hydrogeochemical processes in high temperature Aquifer Thermal Energy Storage systems by drill core analysis, column-, and batch experiments Open

Lioba Virchow, Simona Regenspurg, Ali Saadat · 2023

Algorithmic Optimization of Transistors Applied to Silicon LDMOS Open

Ping-Ju Chuang, Ali Saadat, Maarten L. Van De Put, Hal Edwards, William G. Vandenberghe · 2023

We propose a pioneering approach that integrates optimization algorithms and technology computer-aided design to automatically optimize laterally-diffused metal-oxide-semiconductors (LDMOS) with a field-oxide structure. We define the ratio…

Hydraulic Performance of a Research Well for Testing Aquifer-Thermal-Energy-Storage (Ates) in Berlin (Germany) Open

Guido Bloecher, Simona Regenspurg, Stefan Kranz, Ben Norden, Martin Lipus , et al. · 2022

LDMOS Drift Region With Field Oxides: Figure-of-Merit Derivation and Verification Open

Ali Saadat, Maarten L. Van de Put, Hal Edwards, William G. Vandenberghe · 2022

We analytically and numerically investigate the performance of Laterally-Diffused Metal-Oxide-Semiconductor (LDMOS) transistors with Semi-circular Field OXide (S-FOX) focusing on mid-voltage (30 V – 100 V) power applications. We derive an …

Transition-metal nitride halide dielectrics for transition-metal dichalcogenide transistors Open

Mehrdad Rostami Osanloo, Ali Saadat, Maarten L. Van de Put, Akash Laturia, William G. Vandenberghe · 2021

Using first-principles calculations, we investigate six transition-metal nitride halides as potential vdW dielectrics for transition metal dichalcogenide channel transistors. We identify the best combinations for the p-MOS transistor techn…

Transition-Metal Nitride Halide Dielectrics for Transition-Metal Dichalcogenide Transistors Open

Mehrdad Rostami Osanloo, Ali Saadat, Maarten L. Van de Put, Akash Laturia, William G. Vandenberghe · 2021

Using first-principles calculations, we investigate six transition-metal nitride halides (TMNHs): HfNBr, HfNCl, TiNBr, TiNCl, ZrNBr, and ZrNCl as potential van der Waals (vdW) dielectrics for transition metal dichalcogenide (TMD) channel t…

Identification of two-dimensional layered dielectrics from first principles Open

Mehrdad Rostami Osanloo, Maarten L. Van de Put, Ali Saadat, William G. Vandenberghe · 2021

To realize effective van der Waals (vdW) transistors, vdW dielectrics are needed in addition to vdW channel materials. We study the dielectric properties of 32 exfoliable vdW materials using first principles methods. We calculate the stati…

In-situ Geothermielabor Groß Schönebeck 2000/2001: Bohrarbeiten, Bohrlochmessungen, Hydraulik, Formationsfluide, Tonminerale Open

Ernst Huenges, Suzanne Hurter, Gerhard Lenz, Frank Hoffmann, Jochen Kück , et al. · 2021

Der vorliegende Bericht fasst die Ergebnisse der in den Jahren 2000 und 2001 durchgeführten Arbeiten zur Aufwältigung, zum primären Test- und Messprogramm sowie zum Monitoring in der Geothermiebohrung Groß Schönebeck 3/90 zusammen. Mit Mit…

Identification of Two-Dimensional Layered Dielectrics from First Principles Open

Mehrdad Rostami Osanloo, Maarten L. Van de Put, Ali Saadat, William G. Vandenberghe · 2021

Two-dimensional (2D) van der Waals (vdW) materials promise ideal electrostatic control of charge carrier flow in a channel free of surface roughness or defects. To realize this ideal, good vdW dielectrics are needed in addition to the well…

Channel Length Optimization for Planar LDMOS Field-Effect Transistors for Low-Voltage Power Applications Open

Ali Saadat, Maarten L. Van de Put, Hal Edwards, William G. Vandenberghe · 2020

We identify an optimum channel length for planar Laterally Diffused Metal-Oxide-Semiconductor (LDMOS) field-effect transistors, in terms of the specific on-resistance, through systematic device simulation and optimization. We simulate LDMO…

Making use of geothermal brine in Indonesia: binary demonstration power plant Lahendong/Pangolombian Open

Stephanie Frick, Stefan Kranz, Gina Kupfermann, Ali Saadat, Ernst Huenges · 2019

This paper describes a novel concept for integrating binary plants at a geothermal site which has been realized within a demonstration project in Indonesia. By using an intermediate hot water and an intermediate cooling water cycle it is p…

Geothermie in urbanen Räumen : thermische Untergrundspeicherung und Tiefe Geothermie in Deutschland Open

G. Blöcher, Thomas Reinsch, Simona Regenspurg, J. Henninges, M. Brehme , et al. · 2019

The demand for heat generation based on renewable energies has become increasingly important during the last decades, especially in urban areas. Geothermal energy, the heat stored in the upper part of the Earth‘s crust, offers a huge but l…

Aluminium release by water-rock interaction during hydraulic tests in a siliciclastic aquifer in Berlin (Germany) Open

Simona Regenspurg, Guido Blöcher, Stefan Kranz, Ali Saadat · 2019

Two hydraulic tests of a Triassic sandstone aquifer were performed to determine hydraulic and geochemical parameters of the reservoir formation. Samples collected during all tests showed neutral and constant pH-value of about 7.5. During t…

Hydraulic performance of a scientific Aquifer-Thermal-Energy-Storage (ATES) site in Berlin (Germany) Open

Guido Blöcher, Simona Regenspurg, Stefan Kranz, Jan Henninges, Ben Norden , et al. · 2018

Effizienz und Betriebssicherheit von Energiesystemen mit saisonaler Energiespeicherung in Aquiferen für Stadtquartiere : Abschlussbericht : Berichtszeitraum: 01.12.2012-30.11.2016 Open

Ali Saadat, Internationales Geothermiezentrum, Guido Blöcher, Henning Francke, Ernst Huenges , et al. · 2017

Reservoir Behaviour and Borehole Processes during EGS Operation: Experiences From Three Years of Production and Injection at the Groß Schönebeck Site Open

Jan Henninges, Guido Blöcher, Stefan Kranz, Simona Regenspurg, Thomas Reinsch , et al. · 2015

At the Groß Schönebeck site, Germany, an Enhanced Geothermal System (EGS) has been created in Lower Permian (Rotliegend)\nvolcanic and sedimentary rocks. Short-term production tests have shown success of the applied hydraulic stimulation t…

Improving the Annual Net Power Output of Geothermal Binary Power Plants Open

Stephanie Frick, Stefan Kranz, Ali Saadat · 2015

Current research activities in the field of geothermal binary power plants mainly aim for an enhanced performance of the power plant cycle at the design point. Experience from running power plants, however, shows that improving the design …

Improving Aquifer Thermal Energy Storage Efficiency Open

Stefan Kranz, Guido Bloecher, Ali Saadat · 2015

Aquifer thermal energy storage systems play an important role for the future energy supply systems. Such systems can decouple energy availability (e.g. fluctuating renewable energy, waste heat) and energy supply in times of demand. In orde…

Geothermal Binary Power Plant for Lahendong, Indonesia: A German-Indonesian Collaboration Project Open

Stephanie Frick, Ali Saadat, Taufan Surana, Eben Ezer Siahaan, Andrea Kupfermann , et al. · 2015

In order to successfully demonstrate binary power plant technology at an Indonesian site, a German-Indonesian collaboration involving GFZ Potsdam (Germany), the Agency for the Assessment and Application of Technology in Indonesia (BPPT) an…

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