Publications (40)
A new perspective on Digital Twins: Imparting intelligence and agency to entities
Ashwin Agrawal, Vishal Singh, Martin Fischer
Despite the Digital Twin (DT) concept being in the industry for a long time, it remains ambiguous, unable to differentiate itself from information models, general computing, and si…
Measuring the temperature and heating rate of a single ion by imaging
Bharath Srivathsan, Martin Fischer, Lucas Alber +3
We present a technique based on high resolution imaging to measure the absolute temperature and the heating rate of a single ion trapped at the focus of a deep parabolic mirror. We…
Identifying the Best Machine Learning Algorithms for Brain Tumor Segmentation, Progression Assessment, and Overall Survival Prediction in the BRATS Challenge
Spyridon Bakas, Mauricio Reyes, Andras Jakab +421
Gliomas are the most common primary brain malignancies, with different degrees of aggressiveness, variable prognosis and various heterogeneous histologic sub-regions, i.e., peritum…
Towards wafer-scale diamond nano- and quantum technologies
Richard Nelz, Johannes Görlitz, Dennis Herrmann +8
We investigate native nitrogen (NV) and silicon vacancy (SiV) color centers in commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. We observe si…
Applications of Blockchain for the Governance of Integrated Project Delivery: A Crypto Commons Approach
Jens J. Hunhevicz, Pierre-Antoine Brasey, Marcella M. M. Bonanomi +2
This paper outlines why and how blockchain can digitally support and evolve the governance of collaborative project deliveries, such as integrated project deliveries (IPDs), to pro…
Points for Energy Renovation (PointER): A LiDAR-Derived Point Cloud Dataset of One Million English Buildings Linked to Energy Characteristics
Sebastian Krapf, Kevin Mayer, Martin Fischer
Rapid renovation of Europe's inefficient buildings is required to reduce climate change. However, analyzing and evaluating buildings at scale is challenging because every building…
BIM-GPT: a Prompt-Based Virtual Assistant Framework for BIM Information Retrieval
Junwen Zheng, Martin Fischer
Efficient information retrieval (IR) from building information models (BIMs) poses significant challenges due to the necessity for deep BIM knowledge or extensive engineering effor…
Focusing characteristics of a 4 parabolic mirror light-matter interface
Lucas Alber, Martin Fischer, Marianne Bader +3
Focusing with a 4 parabolic mirror allows for concentrating light from nearly the complete solid angle, whereas focusing with a single microscope objective limits the angle con…
Estimating building energy efficiency from street view imagery, aerial imagery, and land surface temperature data
Kevin Mayer, Lukas Haas, Tianyuan Huang +3
Current methods to determine the energy efficiency of buildings require on-site visits of certified energy auditors which makes the process slow, costly, and geographically incompl…
Deterministic coupling of a single silicon-vacancy color center to a photonic crystal cavity in diamond
Janine Riedrich-Möller, Carsten Arend, Christoph Pauly +5
Deterministic coupling of single solid-state emitters to nanocavities is the key for integrated quantum information devices. We here fabricate a photonic crystal cavity around a pr…
Iterated reflection principles over full disquotational truth
Martin Fischer, Carlo Nicolai, Leon Horsten
Iterated reflection principles have been employed extensively to unfold epistemic commitments that are incurred by accepting a mathematical theory. Recently this has been applied t…
The Application of Blockchain-Based Crypto Assets for Integrating the Physical and Financial Supply Chains in the Construction & Engineering Industry
Hesam Hamledari, Martin Fischer
Supply chain integration remains an elusive goal for the construction and engineering industry. The high degree of fragmentation and the reliance on third-party financial instituti…
Feedback Cooling and Thermometry of a Single Trapped Ion Using a Knife Edge
Hans Dang, Sebastian Luff, Martin Fischer +2
We report on a simple and easy to implement method of feedback cooling trapped ions to temperatures below those achievable using only Doppler cooling. Additionally, the feedback co…
Vitruvio: 3D Building Meshes via Single Perspective Sketches
Alberto Tono, Heyaojing Huang, Ashwin Agrawal +1
Today's architectural engineering and construction (AEC) software require a learning curve to generate a three-dimension building representation. This limits the ability to quickly…
3D Scene Graph: A Structure for Unified Semantics, 3D Space, and Camera
Iro Armeni, Zhi-Yang He, JunYoung Gwak +4
A comprehensive semantic understanding of a scene is important for many applications - but in what space should diverse semantic information (e.g., objects, scene categories, mater…
Deep Sketch-Based 3D Modeling: A Survey
Alberto Tono, Jiajun Wu, Gordon Wetzstein +4
In the past decade, advances in artificial intelligence have revolutionized sketch-based 3D modeling, leading to a new paradigm known as Deep Sketch-Based 3D Modeling (DS-3DM). DS-…
Experimental Demonstration of Commutation Relations Using Intensity Correlations
Hans Dang, Sebastian Luff, Martin Fischer +4
The canonical commutation relation is a cornerstone of quantum theory and underlies the Heisenberg uncertainty principle. Although uncertainty relations have been extensively teste…
A Modified da Vinci Surgical Instrument for OCE based Elasticity Estimation with Deep Learning
Maximilian Neidhardt, Robin Mieling, Sarah Latus +3
Robot-assisted surgery has advantages compared to conventional laparoscopic procedures, e.g., precise movement of the surgical instruments, improved dexterity, and high-resolution…
Site selective growth of heteroepitaxial diamond nanoislands containing single SiV centers
Carsten Arend, Patrick Appel, Jonas Nils Becker +7
We demonstrate the controlled preparation of heteroepitaxial diamond nano- and microstructures on silicon wafer based iridium films as hosts for single color centers. Our approach…
Construction Payment Automation Using Blockchain-Enabled Smart Contracts and Reality Capture Technologies
Hesam Hamledari, Martin Fischer
This paper presents a smart contract-based solution for autonomous administration of construction progress payments. It bridges the gap between payments (cash flow) and the progres…
One- and two-dimensional photonic crystal micro-cavities in single crystal diamond
Janine Riedrich-Möller, Laura Kipfstuhl, Christian Hepp +10
The development of solid-state photonic quantum technologies is of great interest for fundamental studies of light-matter interactions and quantum information science. Diamond has…
Digital Twin in Practice: Emergent Insights from an ethnographic-action research study
Ashwin Agrawal, Vishal Singh, Robert Thiel +4
Based on an ethnographic action research study for a Digital Twin (DT) deployment on an automated highway maintenance project, this paper reports some of the stumbling blocks that…
Single photon emission from silicon-vacancy centres in CVD-nano-diamonds on iridium
Elke Neu, David Steinmetz, Janine Riedrich-Moeller +4
We introduce a process for the fabrication of high quality, spatially isolated nano-diamonds on iridium via microwave plasma assisted CVD-growth. We perform spectroscopy of single…
Fluorescence and polarization spectroscopy of single silicon vacancy centers in heteroepitaxial nanodiamonds on iridium
Elke Neu, Martin Fischer, Stefan Gsell +2
We introduce an advanced material system for the production and spectroscopy of single silicon vacancy (SiV) color centers in diamond. We use microwave plasma chemical vapor deposi…
Digital Twin: From Concept to Practice
Ashwin Agrawal, Martin Fischer, Vishal Singh
Recent technological developments and advances in Artificial Intelligence (AI) have enabled sophisticated capabilities to be a part of Digital Twin (DT), virtually making it possib…
Efficient saturation of an ion in free space
Martin Fischer, Marianne Bader, Robert Maiwald +3
We report on the demonstration of a light-matter interface coupling light to a single ion in free space. The interface is realized through a parabolic mirror…
Localization of narrowband single photon emitters in nanodiamonds
Kerem Bray, Russell Sandstrom, Christopher Elbadawi +6
Diamond nanocrystals that host room temperature narrowband single photon emitters are highly sought after for applications in nanophotonics and bio-imaging. However, current unders…
Measuring the Impact of Blockchain and Smart Contract on Construction Supply Chain Visibility
Hesam Hamledari, Martin Fischer
This work assesses the impact of blockchain and smart contract on the visibility of construction supply chain and in the context of payments (intersection of cash and product flows…
Low temperature investigations of single silicon vacancy colour centres in diamond
Elke Neu, Christian Hepp, Michael Hauschild +6
We study single silicon vacancy (SiV) centres in chemical vapour deposition (CVD) nanodiamonds on iridium as well as an ensemble of SiV centres in a high quality, low stress CVD di…
perturbative and nonperturbative corrections to polarized semileptonic decay distributions
Martin Fischer, Stefan Groote
In this paper we calculate first order radiative QCD corrections to the decay process of a polarized bottom quark. Taking into account both the bo…
Nonclassical truth with classical strength. A proof-theoretic analysis of compositional truth over HYPE
Martin Fischer, Carlo Nicolai, Pablo Dopico Fernandez
Questions concerning the proof-theoretic strength of classical versus non-classical theories of truth have received some attention recently. A particularly convenient case study co…
Electronic transitions of single silicon vacancy centers in the near-infrared spectral region
Elke Neu, Roland Albrecht, Martin Fischer +3
Photoluminescence (PL) spectra of single silicon vacancy (SiV) centers frequently feature very narrow room temperature PL lines in the near-infrared (NIR) spectral region, mostly b…
SYNBUILD-3D: A large, multi-modal, and semantically rich synthetic dataset of 3D building models at Level of Detail 4
Kevin Mayer, Alex Vesel, Xinyi Zhao +1
3D building models are critical for applications in architecture, energy simulation, and navigation. Yet, generating accurate and semantically rich 3D buildings automatically remai…
Digital Twin: Where do humans fit in?
Ashwin Agrawal, Robert Thiel, Pooja Jain +2
Digital Twin (DT) technology is far from being comprehensive and mature, resulting in their piecemeal implementation in practice where some functions are automated by DTs, and othe…
Resonant photo-ionization of Yb+ to Yb2+
Simon Heugel, Martin Fischer, Vladimir Elman +3
We demonstrate the controlled creation of a ion by photo-ionizing with weak continuous-wave lasers at ultraviolet wavelengths. The ph…
A Mobile Robotic Approach to Autonomous Surface Scanning in Legal Medicine
Sarah Grube, Sarah Latus, Martin Fischer +4
Purpose: Comprehensive legal medicine documentation includes both an internal but also an external examination of the corpse. Typically, this documentation is conducted manually du…
Shifting the phase of a coherent beam with a Yb ion: influence of the scattering cross section
Martin Fischer, Bharath Srivathsan, Lucas Alber +3
We discuss and measure the phase shift imposed onto a radially polarized light beam when focusing it onto an ion. In the derivation of the expected phase shif…
Off-resonant emission of photon pairs in nonlinear optical cavities
Valentin A. Averchenko, Gerhard Schunk, Michael Förtsch +4
Cavity-assisted spontaneous parametric down-conversion (SPDC) and spontaneous four-wave mixing (SFWM) in nonlinear optical materials are practical and versatile methods to generate…
LeanAI: A method for AEC practitioners to effectively plan AI implementations
Ashwin Agrawal, Vishal Singh, Martin Fischer
Recent developments in Artificial Intelligence (AI) provide unprecedented automation opportunities in the Architecture, Engineering, and Construction (AEC) industry. However, despi…
Conditional Adversarial Network for Semantic Segmentation of Brain Tumor
Mina Rezaei, Konstantin Harmuth, Willi Gierke +4
Automated medical image analysis has a significant value in diagnosis and treatment of lesions. Brain tumors segmentation has a special importance and difficulty due to the differe…