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  • thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues  (130)
  • bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues  (121)
  • KIT Scientific Publishing  (248)
  • SciELO Books - Centro Edelstein  (3)
  • English  (248)
  • Portuguese  (3)
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  • English  (248)
  • Portuguese  (3)
  • German  (490)
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  • 1
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    Millimeter-Wave Radio-over-Fiber Links based on Mode-Locked Laser Diodes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Radio communications in the range of 60 GHz enable multi-Gigabit/s network access in indoor environments. Due to the propagation characteristics of such signals only very short range radio transmission is feasible. In order to distribute these signals across large distances, analog transmission over optical fiber is considered. In this work, mode-locked laser diodes serve as optoelectronic oscillators for the generation of such signals. Their system-relevant properties are studied in detail.
    Keywords: T1-995 ; millimeter wave communications ; mode-locked lasers ; wireless personal area networks ; radio-over-fiber ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 2
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    Time-dependent spectrum analysis of high power gyrotrons (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In this work, a novel measurement system for the analysis of the gyrotron RF output spectrum was developed. It enables unprecedented time dependent measurements within a large bandwidth, dynamic range and unambiguous RF indication in the entire D-Band (110-170 GHz). Special attention was given to the investigation of parasitic RF oscillations, and the analysis of the interplay of thermal cavity expansion and ionization-based space charge neutralization at the start of long RF pulses.
    Keywords: T1-995 ; spectrum analysis ; Mikrowellenmesstechnik ; millimeter waves ; Gyrotron ; Spektralanalyse ; Millimeterwellen ; microwave measurement techniques ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 3
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    Magnetic Resonance Imaging on Patients with Implanted Cardiac Pacemakers (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The aim of this work was to identify the patterns that can induce heating around implanted cardiac pacemakers during MRI and to develop strategies to counteract them. Two approaches were taken: computer simulations of the occurring electromagnetic field distributions and in-vitro experiments using phantoms in real MRI devices, both for conventional bore-hole and new open MRI systems. Using the open MRI, the observed heating could be reduced significantly.
    Keywords: T1-995 ; pacemaker ; MRI ; numerical field calculation ; biomedical engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 4
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    Realization Limits of Impulse-Radio UWB Indoor Localization Systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this work, the realization limits of an impulse-based Ultra-Wideband (UWB) localization system for indoor applications have been thoroughly investigated and verified by measurements. The analysis spans from the position calculation algorithms, through hardware realization and modeling, up to the localization experiments conducted in realistic scenarios. The main focus was put on identification and characterization of limiting factors as well as developing methods to overcome them.
    Keywords: T1-995 ; localization ; UWB ; transceiver ; positioning ; ultra-wideband ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 5
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    Direct hydroxylation of benzene to phenol in a microstructured Pd-based membrane reactor (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The gas phase direct hydroxylation of benzene into phenol with hydrogen and oxygen, as initially described by Niwa in 2002, was realized in a newly developed double-membrane reactor. In the concept described by Niwa, a dense Pd membrane is used for the (safe) dosage of dissociated hydrogen species into the tubular reaction zone, where it reacts with gas phase oxygen to form surface species capable of directly converting benzene into phenol in a single-step process.
    Keywords: T1-995 ; Pd-Membran ; Katalyse ; Phenol ; Benzol ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 6
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    Magnetization of High Temperature Superconducting Trapped-Field Magnets (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: High temperature superconducting (HTS) bulks and stacks of coated conductors can be magnetized to become trapped-field magnets that provide much stronger magnetic fields than those reachable with conventional permanent magnets. This work investigates the flux dynamics during the magnetization of HTS trapped-field magnets and proposes possible strategies to improve the trapped field produced by the pulsed field magnetization method that is promising for practical applications.
    Keywords: T1-995 ; trapped-field magnet ; Hochtemperatur-Supraleiter ; pulsed field magnetization ; High temperature superconductor ; Supraleiter mit eingeschlossenem Magnetfeld ; gepulste Feldmagnetisierung ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 7
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    Flow control : theoretical concept of absolute instability (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: At the 37th Prandtl memorial lecture on Regions of Viccous Flow, H.Oertel 1994 developed for the first time the stability theory of local perturbations in boundary layers and wake flows, as well as their practical application in the flow control of vehicle flows and the boundary layer of civil aircraft wings.This work presents how the stability theory concept of absolute instability has advanced and proven in practice in the last 15 years in terms of the efficient flow control.
    Keywords: T1-995 ; Flow Control ; Fluid Mechanics ; Stability Theory ; Wake Flow ; Bundary Layer Transition ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 8
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    Measuring the Impact of Lean Techniques on Performance Indicators in Logistics Operations (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Several in-depth studies have verified the positive impact of lean techniques on performance indicators in production environments. Studies performed on warehouse environments have partially confirmed this. This thesis helped to close the gap between the disparities in the level of evidence mentioned above. A study was conducted that included 16 warehouses in an observation group and 56 warehouses in a control group. These significant results help close the gap in the evidence.
    Keywords: T1-995 ; Lean Management ; Lean Production ; schlanke Produktionssysteme ; Lager ; LogistikLean Management ; KPI ; Logistikzentren ; Lean Warehousing ; Logistics ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 9
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    AlGaN/GaN-HEMT power amplifiers with optimized power-added efficiency for X-band applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This work has arisen out of the strong demand for a superior power-added efficiency (PAE) of AlGaN/GaN high electron mobility transistor (HEMT) high-power amplifiers (HPAs) that are part of any advanced wireless multifunctional RF-system with limited prime energy. Different concepts and approaches on device and design level for PAE improvements are analyzed, e.g. structural and layout changes of the GaN transistor and advanced circuit design techniques for PAE improvements of GaN HEMT HPAs.
    Keywords: T1-995 ; MMIC design ; power amplifier ; AlGaN/GaN HEMT ; X-band ; power-added efficiency ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 10
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    Image Analysis and Evaluation of Cylinder Bore Surfaces in Micrographs (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work presents two image-based inspection approaches for the quality evaluation of cylinder bore surfaces. In the first algorithm, metal folds on plateau-honed surfaces are inspected with scanning electron microscopy. An edge-aware structure tensor is proposed for feature extraction and localization of surface defects. The second algorithm uses a morphgraphical method for detecting graphite grains in optical micrographs. Based on the inspection results, quality parameters are proposed.
    Keywords: T1-995 ; image processing ; Bildverarbeitung ; Kantendetektion ; Mikrographhoning ; micrograph ; automated vision inspection ; Honung ; edge detection ; Automatische Sichtprüfung ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 11
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    The Effects of Internal Stress and Lithium Transport on Fracture in Storage Materials in Lithium-Ion Batteries (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Fracture of storage particles is considered to be one of the major reasons for capacity fade and increasing power loss in Li-ion batteries. In this work, we tackle the problem by merging a coupled model of mechanical stress and diffusion of Li-ions with a phase field description of an evolving crack. The novel approach allows us to study the evolution of the Li concentration together with the initiation and growth of a crack in an arbitrary geometry and without presuming a specific crack path.
    Keywords: T1-995 ; Lithium-Diffusion ; Lithium-Ionen-BatterienCrack Growth ; Storage Particles ; Risswachstum ; Phasefield ; Li-Diffusion ; Phasenfeld ; Li-Ion-Batteries ; Speicherpartikel ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 12
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    Silicon-Organic Hybrid Platform for Photonic Integrated Circuits (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: We study the potential of the silicon-organic hybrid (SOH) platform for integrated optics. The unique properties of selected organic materials are added to silicon devices made with CMOS-based processes. We investigate the feasibility of this approach by making prototypes of key components in form of photonic integrated circuits: SOH lasers and SOH modulators are designed, fabricated, post-processed, and characterized. Application scenarios are identified.
    Keywords: T1-995 ; CMOS ; Modulator ; laser ; modulator ; Silizium-Photonik ; Laser ; Detektor ; CMOSsilicon photonics ; detector ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 13
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    Numerical Modeling of Stagnation Flows over Porous Catalytic Surfaces (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book, stagnation flows on a catalytic porous plate is modeled one-dimensionally coupled with multi-step surface reaction mechanisms and molecular transport (diffusion and conduction) in the flow field and in the porous catalyst. Internal and external mass transfer limitations as well as possible reaction routes in the catalyst are investigated for CO oxidation, WGS reaction, partial and steam reforming of methane over Rh/Al?O?.
    Keywords: T1-995 ; Heterogeneous catalysis ; Stofftransportlimitierungen ; Reaktion-DiffusionStagnation-flow reactor ; Staupunktreaktor ; Reaction-Diffusion ; Heterogenen Katalyse ; External and internal mass transfer limitation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 14
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    Electrical-field sensitive YBa?Cu?O??? detectors for real-time monitoring of picosecond THz pulses (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work investigates the capability of the high-temperature superconductor YBCO to sense the evolution of the electrical field of THz pulses. A deposition process for ten unit-cell thin films and a sub-µm patterning process were developed to enable high sensitivities. The detector response to THz exctiations and its electrical-field sensitivity were studied. This unique characteristic allows for the investigation of instabilities of the THz radiation emitted from synchrotron storage rings.
    Keywords: T1-995 ; electrical-field sensitivity ; E-Feld Sensitivität ; synchrotron ; terahertz radiation ; YBCO ; Dünnfilmabscheidung ; Synchrotron ; thin film deposition ; Terahertzstrahlung ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 15
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    High accuracy determination of skin friction differences in an air channel flow based on pressure drop measurements (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The present work delivers a versatile, accurate and reliable wind tunnel facility that is particularly developed to test different flow control techniques for drag reduction in precisely adjustable test conditions. Skin friction changes of 0.4% are resolved, which is comparable to the most accurate reported studies in liquids. this high accuracy is verified through a comprehensive uncertainty analysis. Subsequently, various passive and active flow control strategies are investigated.
    Keywords: T1-995 ; Riblets ; Kanalströmung ; pressure measurement ; riblets ; accuracy ; Messgenauigkeitchannel flow ; drag reduction ; Wandreibung ; Druckmessung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 16
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    ECG Based Analysis of the Ventricular Repolarisation in the Human Heart (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: ECG recordings provide diagnostic relevant information on the de- and repolarisation sequences of the heart. A modification of the repolarisation sequence is assumed to cause Torsades de Pointes. Especially drug induced effects on the repolarisation processes are in focus, since some non-cardiac drugs have been associated with sudden cardiac death in the 1990s. The analysis of the ventricular repolarisation using a set of parameters depicting the morphology of the T-wave is introduced in this work. Therefore, new methods of fully automatic patient-specific QRS detection, beat classification and precise T-wave delineation are presented. Using these methods, medical studies are investigated regarding the modification of the T-wave by different compounds. Also the impact of the heart rate on the morphology of the T-wave is part of this research.The reliable identification of ventricular ectopic beats allows an analysis of the influence of these beats on subsequent heart beats. It turned out that the morphology of subsequent heart beats can significantly be changed. This might give new information on the proarrythmical risk of ventricular ectopic beats.
    Keywords: T1-995 ; QT interval ; QT prolongation ; T wave ; Repolarisation ; HRT ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 17
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    Development of an Electrochemical Biosensor Platform and a Suitable Low-Impedance Surface Modification Strategy (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this work, a flexible biosensor platform based on impedance spectroscopy and comprising of gold electrodes, polymeric flow cells and a suitable surface modification were developed. Initially, several surface modification techniques described in literature were implemented and optimized for impedimetric biosensors but their individual limitations rendered them unsuitable for this biosensor platform. A novel method based on photobleaching was developed and tested showing satisfactory results.
    Keywords: T1-995 ; Mikrofluidik ; electrochemical impedance spectroscopy ; Oberflächenmodifikation ; Biosensor ; surface modification ; photobleaching ; PhotobleichungBiosensor ; microfluidics ; Elektrochemische Impedanzspektroscopie ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 18
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    Grain-size effects in nanoscaled electrolyte and cathode thin films for solid oxide fuel cells (SOFC) (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Due to their high energy conversion efficiencies and low emissions, Solid Oxide Fuel Cells (SOFCs) show promise as a replacement for combustion-based electrical generators at all sizes. Further increase of SOFC efficiency can be achieved by microstructural optimization of the oxygen-ion conducting electrolyte and the mixed ionic-electronic conducting cathode. By application of nanoscaled thin films, the exceptionally high efficiency allows the realization of mobile SOFCs.
    Keywords: T1-995 ; grain-size effect ; nanoscaled thin film ; solid oxide fuel cell (SOFC) ; cathode ; electrolyte ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 19
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    Design and Experimental Investigation of a Second Harmonic 20 kW Class 28 GHz Gyrotron for Evaluation of New Emitter Technologies (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Gyrotrons are high-power mm-wave tubes. Here, the design, construction and experimental investigation of a 20 kW, 28 GHz gyrotron (2nd harmonic) are reported. This tube was designed to evaluate new emitters for future highly efficient and reliable fusion gyrotrons and for material processing applications. Following experimental results have been achieved in CW operation: 22.5 kW output power at 23.4 kV electron beam voltage and 2.23 A beam current with the world record efficiency of 43 %.
    Keywords: T1-995 ; Microwave-Materials-Processing ; Wirkungsgrad ; Efficiency ; Kernfusion ; Emitter-Technologien ; Nuclear-Fusion ; Emitter-Technologies ; Gyrotron ; MikrowellenmaterialprozesstechnikGyrotron ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 20
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    Mapping and Localization in Urban Environments Using Cameras (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In this work we present a system to fully automatically create a highly accurate visual feature map from image data aquired from within a moving vehicle. Moreover, a system for high precision self localization is presented. Furthermore, we present a method to automatically learn a visual descriptor. The map relative self localization is centimeter accurate and allows autonomous driving.
    Keywords: T1-995 ; Maschinelles Sehen ; Lokalisierung ; Kartierung ; Autonomes Fahren ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 21
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    Lane-Precise Localization with Production Vehicle Sensors and Application to Augmented Reality Navigation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This works describes an approach to lane-precise localization on current digital maps. A particle filter fuses data from production vehicle sensors, such as GPS, radar, and camera. Performance evaluations on more than 200 km of data show that the proposed algorithm can reliably determine the current lane. Furthermore, a possible architecture for an intuitive route guidance system based on Augmented Reality is proposed together with a lane-change recommendation for unclear situations.
    Keywords: T1-995 ; localization augmented Reality navigation route guidance particle filter ; Lokalisierung Erweiterte Realität Navigation Routenführung Partikelfilter ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 22
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    Superconducting Multilayer Technology for Josephson Devices : Technology, Engineering, Physics, Applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Within this book fabrication processes for high-quality Josephson junctions based on niobium and aluminum oxide as well as niobium nitride and aluminum nitride on various substrates are discussed. Techniques for achieving a planar chip topography and sub-µm lateral dimensions, aiding the realization of sophisticated Josephson devices such as SQUIDs, flux-flow oscillators and long Josephson junctions with artificial phase discontinuities, are presented in detail.
    Keywords: T1-995 ; Superconductor ; Quantum ; Multilayer ; Cryogenics ; Josephson ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 23
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    Integrated Planning and Control for Collision Avoidance Systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Collision avoidance systems like emergency braking assist systems have demonstrated their effectiveness in increasing the safety of vehicle passengers in various studies. To further increase the effectiveness of collision avoidance systems, the exploitation of the lateral free space by evasive maneuvers is being investigated in this book. This work focuses on methods for integrated trajectory planning and vehicle dynamics control in collision avoidance scenarios by combined evasion and braking.
    Keywords: T1-995 ; Fahrdynamikregelung ; model predictive control ; Collision Avoidance System ; Modelprädiktive Regelung ; Kollisionsvermeidung ; Trajectory Planning ; Driver Assistance System ; Fahrassistenzsystem ; Trajektorienplanung ; Vehicle Dynamics Control ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 24
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    O Estado, a agricultura e a pequena produção (2021)
    SciELO Books - Centro Edelstein
    Details
    Publication Date: 2023-12-21
    Description: O debate sobre a questão agrária no Brasil durante a década de 70 pode ser visto, retrospectivamente, como uma tentativa de enfrentar a superação política e econômica, pós-golpe militar, do debate clássico “feudalismo x capitalismo” dos anos 50 e 60.
    Keywords: T1-995 ; TECHNOLOGY & ENGINEERING ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: Portuguese
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  • 25
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    Spectral near field data of LED systems for optical simulations (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This book presents, validates and applies a fast, accurate and general measurement and modeling technique to obtain spectral near field data of LED systems for optical simulations in order to address the steadily increasing requirements of modern high quality LED systems. It requires only a minimum of goniophotometric near field measurements and no time-consuming angularly resolved spectral measurements. The obtained results can be used directly in state-of-the-art ray tracers.
    Keywords: T1-995 ; Leuchtdioden (LED) ; Strahlverfolgung ; Radiometrie ; Ray tracing ; Radiometry ; Light-emitting diodes (LED) ; Lighting technology ; Lichttechnik ; Photometry ; Photometrie ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 26
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    Electrochemical Performance and Stability of Ba?.?Sr?.?Co?.?Fe?.?O??? for Oxygen Transport Membranes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Mixed ionic-electronic conducting (MIEC) ceramics as oxygen transport membranes (OTMs) can provide high oxygen permeation rates at comparably low energy demands. For this purpose, Ba?.?Sr?.?Co?.?Fe?.?O??? (BSCF) shows the best performance under ideal operating conditions. Thermal and chemical stability investigations, electrical behavior ?(T,pO?,t), and oxygen exchange parameter extraction by means of electrical conductivity relaxation resulted in a far better understanding of the BSCF system.
    Keywords: T1-995 ; electrochemical characterization ; thermische und chemische Stabilitätmixed ionic-electronic conductors ; oxygen transport membranes ; elektronische/ionische Mischleiter ; thermal and chemical stability ; Sauerstofftransportmembranen ; BSCF ; elektrochemische Charakterisierung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 27
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    Modelling the human cardiac fluid mechanics. 2nd ed (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In the second edition of the article a virtual heart modelsimulating the flow in the active left human ventricle andatrium is presented. Because in vivo myocardium data is notavailable, the movement of the active ventricle and its atriumis given by three-dimensional, time-dependent invivo image dataof a nuclear spin MRI tomograph. The passive part of the virtualheart model consists of a model aorta and of two-dimensionallymodelled heart valves. As the flow is actively driven by theventricle and atrium, a coupling off low and structure isnecessary to take into account the deviation of the aorta andthe closing and opening of the heart valves. This coupling isreplaced by the movement given by MRI tomograph and ultrasonicDoppler echocardiography, since we focus on the flow simulationin the left pumping ventricle. The flow simulation is performedby a validated commercial software package that uses the finitevolume method. The flow resistance of the circulation throughthe body is taken into account with a simplified circulationmodel. The article shows how the virtual heart model can be usedto predict flow losses and flow structures due to pathologicalventricle contraction defects. It provides as an example theflow simulation of an unhealthy human ventricle with ananeurysm. The flow structure and flow losses are consideredbefore and after surgery.
    Keywords: T1-995 ; Herzmuskel ; NMR-Tomographie ; Herzkrankheit ; Numerische Strömungssimulation ; Herz ; in vivo ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 28
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    Application of the cohesive zone model to the analysis of rotors with a transverse crack (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Ein Riss im Rotor ruft eine lokale Steifigkeitsänderung hervor. Die vorliegende Arbeit ermittelt die Steifigkeitsänderung einer angerissenen Welle. Dazu wird ein Kohäsivzonenmodell eingesetzt. Das Modell wurde für die erste Rissöffnungsmode bei ebenem Verzerrungszustand in Abhängigkeit der Mehrachsigkeit des Spannungszustandes (Triaxialität) entwickelt. Außerdemwird das Kohäsivzonenmodell bei einem eindimensionalen Kontinuumsrotor als FE Modell ausgeführt.
    Keywords: T1-995 ; Cohesive zone model ; cracked rotor ; stiffness variation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 29
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    Simulations for the optimization of High Temperatur Superconductor current leads for nuclear fusion applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads.
    Keywords: T1-995 ; current lead ; Nuclear fusion ; High Temperature Superconductor ; Computational thermal Fluid Dynamics ; Numerical simulation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Reactive Control of Turbulent Wall-Bounded Flows for Skin Friction Drag Reduction (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The work presents an attempt to improve the understanding of reactive drag reducing control of near-wall turbulence with respect to limitations present in a realistic application scenario. The reference reactive control scheme of opposition control is studied using direct numerical simulation through the consideration of various application oriented restrictions, i.e. local control application, limited spatial and temporal resolution of the scheme, sensor noise and control elements arrangement.
    Keywords: T1-995 ; turbulence control ; direct numerical simulation ; turbulent boundary layers ; Direkte Numerische Simulation ; Reibungsminderung ; drag reduction ; Turbulente Grenzschichten ; Turbulenzkontrolle ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 31
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    Real-time imaging systems for superconducting nanowire single-photon detector arrays (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Superconducting nanowire singe-photon detectors (SNSPD) are promising detectors in the field of applications, where single-photon resolution is required like in quantum optics, spectroscopy or astronomy. These cryogenic detectors gain from a broad spectrum in the optical and infrared range and deliver low dark count rates and low jitter times. This thesis improves the understanding of the detection mechanism of SNSPDs and intodruces new and promising multi-pixel readout concepts.
    Keywords: T1-995 ; superconductivity ; Multi-pixelsingle-photon detector ; Echtzeitauslese ; SNSPD ; Supraleitung ; real-time readout ; multi-pixel ; Einzelphotonendetektor ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 32
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    Microstructural modeling and computational homogenization of the physically linear and nonlinear constitutive behavior of micro-heterogeneous materials (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Engineering materials show a pronounced heterogeneity on a smaller scale that influences the macroscopic constitutive behavior. Algorithms for the periodic discretization of microstructures are presented. These are used within the Nonuniform Transformation Field Analysis (NTFA) which is an order reduction based nonlinear homogenization method with micro-mechanical background. Theoretical and numerical aspects of the method are discussed and its computational efficiency is validated.
    Keywords: T1-995 ; microstructure ; order reduction method ; mesh generation ; computational homogenization ; composite materials ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    High-Speed, Low-Power and Mid-IR Silicon Photonics Applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In this book, the first high-speed silicon-organic hybrid (SOH) modulator is demonstrated by exploiting a highly-nonlinear polymer cladding and a silicon waveguide. By using a liquid crystal cladding instead, an ultra-low power phase shifter is obtained. A third type of device is proposed for achieving three-wave mixing on the silicon-organic hybrid (SOH) platform. Finally, new physical constants which describe the optical absorption in charge accumulation/inversion layers in silicon are determined.
    Keywords: T1-995 ; optical absorption ; high-speed modulators ; mid-IR ; Silicon photonics ; liquid crystals ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 34
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    Multiscale Modeling of Cardiac Electrophysiology: Adaptation to Atrial and Ventricular Rhythm Disorders and Pharmacological Treatment (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Multiscale modeling of cardiac electrophysiology helps to better understand the underlying mechanisms of atrial fibrillation, acute cardiac ischemia and pharmacological treatment. For this purpose, measurement data reflecting these conditions have to be integrated into models of cardiac electrophysiology. Several methods for this model adaptation are introduced in this thesis. The resulting effects are investigated in multiscale simulations ranging from the ion channel up to the body surface.
    Keywords: T1-995 ; acute cardiac ischemia ; parameter adaptation ; pharmacological therapy ; atrial fibrillation ; cardiac modeling ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 35
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    Model-based Interpretation of the Performance and Degradation of Reformate Fueled Solid Oxide Fuel Cells (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Solid oxide fuel cells offer great prospects for the sustainable, clean and safe conversion of various fuels into electrical energy. In this thesis, the performance-determining loss processes for the cell operation on reformate fuels are elucidated via electrochemical impedance spectroscopy. Model-based analyses reveal the electrochemical fuel oxidation mechanism, the coupling of fuel gas transport and reforming chemistry and the impact of fuel impurities on the degradation of each loss process.
    Keywords: T1-995 ; Reforming Chemistry ; Impedance Spectroscopy ; Electrochemistry ; Modeling ; SOFC ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 36
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    Finite element simulation of dislocation based plasticity and diffusion in multiphase materials at high temperature (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: A single-crystal plasticity model as well as a gradient crystal plasticity model are used to describe the creep behavior of directionally solidi?ed NiAl based eutectic alloys. To consider the transition from theoretical to bulk strength, a hardening model was introduced to describe the strength of the reinforcing phases. Moreover, to account for microstructural changes due to material ?ux, a coupled diffusional-mechanical simulation model was introduced.
    Keywords: T1-995 ; Crystal plasticity ; Creep ; Directional solidification ; Gradient plasticity ; Finite element simulation ; Kriechen ; Gerichtete Erstarrung ; Finite Elemente Methode ; Kristallplastizität ; Gradientenplastizität ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 37
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    Micromechanical finite element simulations of crack propagation in silicon nitride (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Silicon nitride is used for challening applications like cutting inserts or forming rolls. The extreme strength and toughness of the material is achieved by an interaction between the microstructure and fracture behaviour on the microlevel. In order to understand these mechanisms, detailed unit cells have been defined and used for the determination of the effective fracture properties. The results have been used for the implementation of an effective continuum damage mechanics model.
    Keywords: T1-995 ; silicon nitride ; finite element simulation ; toughness ; structure ; fracture ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 38
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    Work-hardening of dual-phase steel (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Dual-phase steels exhibit good mechanical properties due to a microstructure of strong martensitic inclusions embedded in a ductile ferritic matrix. This work presents a two-scale model for the underlying work-hardening effects; such as the distinctly different hardening rates observed for high-strength dual-phase steels. The model is based on geometrically necessary dislocations and comprises the average microstructural morphology as well as a direct interaction between the constituents.
    Keywords: T1-995 ; two-scale model ; Kompositwerkstoffdual-phase steel ; composite ; material modelling ; dislocation mechanism ; Zweiskalenmodell ; Versetzungsmechanismen ; Dualphasenstahl ; Materialmodellierung ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 39
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    Human worker activity recognition in industrial environments (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In this work, an intelligent human-machine interface (HMI) for human worker activity recognition in industrial environments is presented. The interface consists of components for robust and accurate 3D position estimation in workspace environments, the recognition of task-related worker activities and human-computer interaction via gestures. All components of the presented HMI are flexible with respect to applications and can be transferred to other activity recognition problems, as well.
    Keywords: T1-995 ; inertial navigation ; gesture recognition ; human machine interface ; activity recognition ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 40
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    Requirements and concepts for future automotive electronic architectures from the view of integrated safety (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In this dissertation, concepts of the electronic architecture of automotive Integrated Safety System are developed as a cooperative approach of engineering process, dependable hardware architecture and software platform. The development process covers distributed rapid prototyping with virtual front-loading and correct-by-construction. Concepts of fault tolerant hardware architecture and dependability software services are discussed with design guidelines.
    Keywords: T1-995 ; dependable software platform ; Agreement ; dependability software services ; E/E-Architecture ; Integrated Safety System ; SW-Watchdog ; fault-tolerant hardware ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 41
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    Near-critical and supercritical hydrothermal flow synthesis of metal oxide nanoparticles and hybrid metal oxide nanoparticles presenting clickable anchors (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The continuous hydrothermal flow synthesis of functionalized and non-functionalized nanoparticle dispersions was pursued. Besides improving the understanding of the relationship between process variables and the resulting nanoparticle dispersions, the usability of this process was extended by introducing clickable organic modifiers, a step toward the development of a convenient and versatile process for the synthesis of metal oxide nanoparticles with universal anchors on their surface.
    Keywords: T1-995 ; Click-ChemieHydrothermal synthesis ; Kern-Schale-Nanopartikel ; Hydrothermale Synthese ; Supercritical water ; Differential centrifugal sedimentation ; Core-shell nanoparticles ; Click chemistry ; Überkritisches Wasser ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 42
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    Slow-light photonic crystal devices for high-speed optical signal processing (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This book discusses design, modeling, and the characterization of slow-light photonic crystal waveguides. Guidelines are developed to obtain slow-light waveguides with broadband characteristics and with low disorder-induced losses. Three functional devices are proposed and studied: A tunable dispersion compensator, a tunable optical delay line, and a high-speed electro-optic modulator. Optical and microwave measurements confirm the designs.
    Keywords: T1-995 ; Slow Light ; Optical Delay Line ; Silicon Photonics ; Photonic Crystal ; Electro-Optic Modulator ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Frentes de expansão e estrutura agrária: estudo do processo de penetração numa área da transamazônica (2021)
    SciELO Books - Centro Edelstein
    Details
    Publication Date: 2024-04-09
    Description: O corpo principal deste trabalho foi apresentado em junho de 1970 como dissertação de mestrado ao Programa de Pós-Graduação em Antropologia Social do Departamento de Antropologia, do Museu Nacional da Universidade Federal do Rio de Janeiro.
    Keywords: T1-995 ; TECHNOLOGY & ENGINEERING ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: Portuguese
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    Body Matched Antennas for Microwave Medical Applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In this work, new concepts of body-matched antennas for microwave medical applications were developed, where the antennas are placed directly on or in the human body. Two types of antennas were designed - on-body matched antennas for diagnosis and implantable antennas for data telemetry with the main focus of miniaturization yet maintained a high radiation performance. The applicability of the antennas was verified using a medical imaging system for the detection of hemorrhagic stroke.
    Keywords: T1-995 ; body-matched antenna ; Ultra Wideband ; medical application ; microwave Imaging ; implantable antenna ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 45
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    Discrete time analysis of batch processes in material flow systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Scope of this work is the development of appropriate models for the evaluation of batch processes in material flow systems. The presented analytical methods support the long range planning in an early planning stage, in which capacities are determined to minimize the facility costs under the condition of cycle time targets.
    Keywords: T1-995 ; Performance evaluation ; Batch processes ; Discrete time ; Queueing theory ; Material flow planning ; Logistics ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 46
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    Speckle Reduction in Projection Systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: A speckle pattern is a quasi-random interference pattern which typically emerges when lasers are used as illumination sources in projection applications and which severely degrades the image quality. Since in most projection applications high speckle disturbance is not tolerable, speckle reduction is a major issue. This work gives an introduction into the theoretical description of speckle and investigates different practical methods for speckle reduction in laser projection systems.
    Keywords: T1-995 ; speckle ; speckle-reduction ; laser-projection-systems ; optical coherence ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 47
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    Proliferation-proof Uranium/Plutonium and Thorium/Uranium Fuel Cycles: Safeguards and Non-Proliferation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Thermal and neutron physics analysis show that above certain concentrations of the isotope Pu-238 hypothetical nuclear explosive devices, made of reactor-grade plutonium, are technically not feasible. Future proliferation-proof fuel cycles are proposed which make use of methods of actinide tansmutation.Reactors operating in the thorium/uranium fuel cyce are loaded with 〈20% U-235 uranium fuel which can be made proliferation-proof against re-enrichment by adding a certain ppm level of U-232.
    Keywords: T1-995 ; Enrichment ; Anreicherung ; Wiederaufarbeitung ; hochangereichertes Uran ; Plutonium ; Proliferation ; Reprocessing ; high enriched Uranium.Proliferation ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Constructing a Global Technology Assessment : Insights from Australia, China, Europe, Germany, India and Russia (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Worldwide simultaneous effects of technologies, international challenges such as climate change as well as shifting relationships between science and society call for approaches that can address these issues on a global level. This book examines the potential of Technology Assessment (TA), as an until now mainly national and Western concept, to take on this global level and provide answers to these pressing questions.
    Keywords: T1-995 ; Technologiepolitik ; science & technology governance ; Technikfolgenabschätzung ; globalization ; Globalisierung Technology Assessment ; policy ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 49
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    Constitutive modeling of amorphous thermoplastic polymers with special emphasis on manufacturing processes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This book deals with the development of constitutive models for the mechanical behavior of amorphous thermoplastic polymers at large strains. A special emphasis lies on the temperature dependency so that the altered material behavior at high temperatures can be considered. To implement the developed constitutive models the software tool AceGen is used by which program code is generated and optimized as well as derivatives are calculated automatically.
    Keywords: T1-995 ; modelling process chain ; amorphe Thermoplaste ; Thermoformen ; Modellierung Prozesskettematerial modelling ; automatization of computational mechanics ; automatisierte Modellierung ; amorphous thermoplastic poylmers ; Materialmodellierung ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 50
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    Feasibility and Operational Limits for a 236 GHz Hollow-Cavity Gyrotron for DEMO (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The DEMOnstration fusion power plant (DEMO) will be the first fusion reactor, which is intended to generate net electrical power. For successful operation of DEMO, high-power gyrotrons with operating frequencies up to 240 GHz are required for plasma heating and stabilization. In this work, a systematic feasibility study and tolerance analysis are performed for the conventional-type hollow-cavity DEMO gyrotrons. The various approaches are also suggested to identify its operational limits.
    Keywords: T1-995 ; Hollow-cavity ; Hohlleitergyrotron ; Kernfusion ; Frequenz durchstimmbarkeit ; Gyrotron ; DEMO ; Nuclear Fusion ; Frequency Tunability ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Nanophotonic Devices for Linear and Nonlinear Optical Signal Processing (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: High index-contrast nanophotonic devices are key components for future board-to-board and chip-to-chip optical interconnects: The strong confinement of light enables dense integration, and nonlinear effects can be exploited at low power levels. Cheap large-scale production is possible by using highly parallel microfabrication techniques, and semiconductor-based nanophotonic devices can be integrated together with electronic circuitry on a common chip. Particularly intense research is carried out to realise optical devices on silicon substrates, using mature complementary metal-oxide-semiconductor (CMOS) fabrication techniques.This book discusses the modelling, fabrication and characterization of linear and nonlinear nanophotonic devices. Roughness-related scattering loss in high index-contrast waveguides is investigated both theoretically and experimentally, and methods of loss reduction are developed. Novel silicon-based devices for electro-optic modulation and for all-optical signal processing are presented. Nonlinear dynamics in active quantum-dot devices are studied, and resonant field enhancement is exploited to improve the efficiency of nonlinear interaction.
    Keywords: T1-995 ; Optische Signalverarbeitung ; Optische Nachrichtentechnik ; Silizium-Photonik ; PhotonikIntegrierte Optoelektronik ; SOI-Technik ; Nanophotonik ; Silizium-Optik ; Nichtlineare Optik ; Integrierte Optik ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Crosswind stability of vehicles under nonstationary wind excitation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work has studied the crosswind stability of vehicles under nonstationary wind excitation in various scenarios. Railway vehicles running on curved and straight track with varying vehicle speed are studied. Road vehicles are classified into different categories. For each vehicle class, a corresponding worst-case vehicle model has been built. As the wind excitation on the vehicle is a stochastic process, a risk analysis has to be carried out and failure probabilities are computed and analyzed.
    Keywords: T1-995 ; RisikoanalyseCrosswind stability ; Vehicle ; instationär ; Stochastik ; Fahrzeug ; Seitenwindstabilität ; Nonstationary ; Stochastic ; Risk analysis ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    High quality Nb/Al-AlOx/Nb Josephson junctions : technological development and macroscopic quantum experiments (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Diese Arbeit beschreibt die Entwicklung einer Technologie für die Herstellung hochqualitativer sub-µm Nb/Al-AlOx/Nb-Josephson-Kontakte. Mit den dadurch entstandenen Bauteilen wurden verschiedene experimentell zuvor noch nicht beobachtete makroskopische Quanteneffekte nachgewiesen. Weiterhin wurden Nb-basierte Phasen-Qubits entworfen, hergestellt und gemessen, die längere Kohärenzzeiten als vergleichbare Bauelemente aus der Literatur aufweisen.
    Keywords: T1-995 ; MQT ; Nb/AlOx/Nb technology ; decoherence ; quantum bits ; thin film technology ; macroscopic quantum effects ; Josephson junctions ; dielectric losses ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 54
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    GASFLOW-MPI: A Scalable Computational Fluid Dynamics Code for Gases, Aerosols and Combustion. Band 1 (Theory and Computational Model (Revision 1.0) und Band 2 (Users' Manual). (KIT Scientific Reports ; 7710 und 7711) (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Karlsruhe Institute of Technology (KIT) is developing the parallel computational fluid dynamics code GASFLOW-MPI as a best-estimate tool for predicting transport, mixing, and combustion of hydrogen and other gases in nuclear reactor containments and other facility buildings. GASFLOW-MPI is a finite-volume code based on proven computational fluid dynamics methodology that solves the compressible Navier-Stokes equations for three-dimensional volumes in Cartesian or cylindrical coordinates.
    Keywords: T1-995 ; containment ; CFD code ; hydrogen safety ; nuclear safety ; GASFLOW ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 55
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    Organic laser diodes: modelling and simulation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This thesis analyzes the impact of various loss processes on the threshold current density of organic semiconductor laser diodes by numerical simulation. Design concepts based on organic double-heterostructures are evaluated and design rules are derived which can be used in order to reduce the impact of loss processes and in order to improve the device performance.
    Keywords: T1-995 ; organic laser diodes ; simulation ; loss processes ; design rules ; organic semiconductor ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 56
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    Magnetoresistive and Thermoresistive Scanning Probe Microscopy with Applications in Micro- and Nanotechnology (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work presents approaches to extend limits of scanning probe microscopy techniques towards more versatile instruments using integrated sensor concepts. For structural surface analysis, magnetoresistive sensing is introduced and thermoresistive sensing is applied to study nanoscale phonon transport in chain-like molecules. Investigating with these techniques the properties of shape memory polymers, a fabrication method to design application-inspired micro- and nanostructures is introduced.
    Keywords: T1-995 ; Formgedächtnis ; Magnetoresistive ; Thermoresistive ; Leitfähigkeit ; Magnetismus ; TunnelwiderstandScanning Probe Microscopy ; Rasterkraftmikroskopie ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 57
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    Highly Resolved Synthetic Aperture Radar with Beam Steering (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The present work deals with a highly resolved radar with a synthetic aperture (synthetic aperture radar - SAR), which uses a beam steering to improve performance. The first part of this work deals with the influence of various effects occurring in the hardware of the High-Resolution Wide-Swath SAR (HRWS SAR) system. A special focus was set to single bit quantization in multi-channel receiver. The second part of this work describes SAR processors for Sliding Spotlight mode.
    Keywords: T1-995 ; Datenverarbeitung ; SAR ; Radar ; data processing ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 58
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    Organic Semiconductor Lasers and Tailored Nanostructures for Raman Spectroscopy (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work presents the application of organic semiconductor distributed feedback laser as free-space excitation source in Raman spectroscopy. Surface-enhanced Raman scattering effect is exploited to improve the detection sensitivity. The SERS conditionis achiedved by using substrates consisting of gold-coated polymeric nanopillar arrays. The organic-laser-excited SERS measurements are applied to verify the concentration variation of biomolecule adenosine in aqueous solutions.
    Keywords: T1-995 ; Lab-on-Chiporganic semiconductor ; lab-on-a-chip ; oberflächenverstärkte Raman-Spektroskopie ; Organischer Halbleiter ; DFB-laser ; DFB-Laser ; surface-enhanced Raman spectroscopy ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 59
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    Modelling the bird flight : Scientific Report 2007-2010 (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The aerodynamics of flying birds and insects plays a crucial role in the domain of aeronautical engineering. The energy-efficient construction of winglets for airplanes, the formation flight of tactical aircraft or the drone engineering or military applications are inspired by birds. This holds also for flow and structure simulation of flapping wing motion, taking the unsteady aerodynamics and corresponding wing deformations into account at high flow velocities and flapping frequencies.
    Keywords: T1-995 ; Unsteady Aerodynamics ; Bird Flight ; Model Validation ; Flow-Structure Coupling ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    Soft Magnetic Composites in Novel Designs of Electrical Traction Machines (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Nowadays, the manufacturing of electrical machines based on electrical steel laminations has been well established worldwide. Compared with the electrical steel, the soft magnetic composites (SMC) shows magnetic isotropy and lower eddy current losses. Thus, it becomes an important impulse promoting the development of new topologies of electrical machine. The application of SMC in the electrical traction machine for hybrid electrical vehicle or electrical vehicle has been researched in the work.
    Keywords: T1-995 ; Finite-Elemente-MethodeSoft Magnetic Composites ; Finite element method ; Axial flux machine ; Elektrische Traktionsmaschine ; Pulververbundwerkstoff ; Electrical traction machine ; Axialflussmaschine ; Transversalflussmaschine ; Transverse flux machine ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    High Performance Light Water Reactor : Design and Analyses (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The High Performance Light Water Reactor is a nuclear reactor concept of the 4th generation which is cooled and moderated with supercritical water. The concept has been worked out by a consortium of European partners, co-funded by the European Commission. It features a once through steam cycle, a pressure vessel type reactor, and a compact containment with pressure suppression pool. The conceptual design enables to assess its feasibility, its safety features and its economic potential.
    Keywords: T1-995 ; Supercritical Water ; Light Water Reactor ; Conceptual Design ; Nuclear Power Plant ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Personalized Multi-Scale Modeling of the Atria: Heterogeneities, Fiber Architecture, Hemodialysis and Ablation Therapy (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This book targets three fields of computational multi-scale cardiac modeling. First, advanced models of the cellular atrial electrophysiology and fiber orientation are introduced. Second, novel methods to create patient-specific models of the atria are described. Third, applications of personalized models in basic research and clinical practice are presented. The results mark an important step towards the patient-specific model-based atrial fibrillation diagnosis, understanding and treatment.
    Keywords: T1-995 ; atrial fibrillation ; radio-frequency ablation ; hemodialysis therapy ; atrial anatomy ; cardiac modeling ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 63
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    Near Infrared Laser Sensor System for In-Line Detection of Conversion in UV-Cured Polymer Coatings (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The work describes a method for the determination of the conversion by radical photopolymerization of acrylic coatings that is suitable for an in situ monitoring during the coating process.The applied method is based on the 1620 nm overtone absorption of the acrylate end group. The capability of the sensor to discriminate between polymerized and unpolymerized coatings on metal substrates down to a coating thickness of less than 16µm is demonstrated and and proved by reference measurements.
    Keywords: T1-995 ; acrylate ; photopolymerization ; in-line monioring ; UV-coatings ; 1620 nm overtone absorption ; conversion monitoring ; IR-spectroscopy ; coating thickness ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Omnidirectional Stereo Vision for Autonomous Vehicles (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Environment perception with cameras is an important requirement for many applications for autonomous vehicles and robots. This work presents a stereoscopic omnidirectional camera system for autonomous vehicles which resolves the problem of a limited field of view and provides a 360° panoramic view of the environment. We present a new projection model for these cameras and show that the camera setup overcomes major drawbacks of traditional perspective cameras in many applications.
    Keywords: T1-995 ; Bildverarbeitung ; Autonomous Vehicles ; Rundumsicht ; Kamera-Kalibrierung ; Computer Vision ; Autonomes Fahren ; Robotik ; Camera-Calibration ; Omni-Vision ; Robotics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Optimization of Hot-Electron Bolometers for THz Radiation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Hot-electron bolometers are fast and low noise radiation detectors which can be used for many different applications. The aim of this work was to optimize the fabrication process of hot-electron bolometers and gain a deeper understanding of the underlying processes. To achieve this, the fabrication of the superconducting thin films was optimized and the superconducting properties of the films were analyzed. Detectors fabricated using the results showed a record value for the noise temperature.
    Keywords: T1-995 ; noise temperature ; superconductivity ; THz detector ; optimization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Single-Laser Multi-Terabit/s Systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Optical communication systems carry the bulk of all data traffic worldwide. This book introduces multi-Terabit/s transmission systems and three key technologies for next generation networks. A software-defined multi-format transmitter, an optical comb source and an optical processing scheme for the fast Fourier transform for Tbit/s signals. Three world records demonstrate the potential: The first single laser 10 Tbit/s and 26 Tbit/s OFDM and the first 32.5 Tbit/s Nyquist WDM experiments.
    Keywords: T1-995 ; Comb Generation ; Advanced Optical Multiplexing ; Terabit/s Communication ; Multi-Format Transmitter ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Reports on industrial information technology. Vol. 12 (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The 12th volume of Reports on Industrial Information Technology presents some selected results of research achieved at the Institute of Industrial Information Technology during the last two years.These results have contributed to many cooperative projects with partners from academia and industry and cover current research interests including signal and image processing, pattern recognition, distributed systems, powerline communications, automotive applications, and robotics.
    Keywords: T1-995 ; Powerline Communications ; Image Processing ; Robotics and autonomous systems ; Automotive ; Signal Processing ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Single-crystal gradient plasticity with an accumulated plastic slip: Theory and applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In experiments on metallic microwires, size effects occur as a result of the interaction of dislocations with, e.g., grain boundaries. In continuum theories this behavior can be approximated using gradient plasticity. A numerically efficient geometrically linear gradient plasticity theory is developed considering the grain boundaries and implemented with finite elements. Simulations are performed for several metals in comparison to experiments and discrete dislocation dynamics simulations.
    Keywords: T1-995 ; Finite element method ; Microwires ; Einkristallplastizität ; Finite Elemente MethodeGradient plasticity ; Korngrenzeffekte ; Single-crystal plasticity ; Mikrodrähte ; Grain boundary influence ; Gradientenplastizität ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Development of a completely decentralized control system for modular continuous conveyors (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: To increase the flexibility of continuous conveyor systems, a completely decentralized control system for a modular conveyor system was developed. The system is able to carry conveyor units without any centralized infrastructure. Based on existing methods of data transfer in IT networks, single modules operate autonomously and, after being positioned into the required topology, independently connect together to become a functioning conveyor system.
    Keywords: T1-995 ; Continuous conveyor ; Flexible ; Conveying technology ; Modular ; Autonomous ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Experimental Investigations of Deformation Pathways in Nanowires (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work deals with the experimental investigation of the mechanical properties of nanowires. Experiments are conducted in a dedicated system inside the electron microscope. The mechanical response of various material systems is probed, the underlying deformation mechanisms are elucidated and subsequently put into context with mechanical size effects.
    Keywords: T1-995 ; Size-Effect ; Scanning-Electron Microscopy ; mechanical Properties ; Nanowires ; Nanotechnology ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Design and Analysis of Robust Kanban System in an Uncertain Environment (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Kanban is a representative control policy pursuing cost-efficient features for the material flow system. However, the Kanban mechanism increases the system vulnerability especially when the environment is uncertain. Therefore, we proposed a robust Kanban system model for the supply chain system based on the Kanban mechanism. The model can use robust approaches from strategic, tactical, and operational levels to deal with the risks in an uncertain environment.
    Keywords: T1-995 ; risk management ; Kanban ; robust ; supply chain ; simulation ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    A Problem-Oriented Approach for Dynamic Verification of Heterogeneous Embedded Systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work presents a virtual prototyping methodology for the design and verification of industrial devices in the field level of industrial automation systems. This work demonstrates that virtual prototypes can help increase the confidence in the correctness of a design thanks to a deeper understanding of the complex interactions between hardware, software, analog and mixed-signal components of embedded systems and the physical processes they interact with.
    Keywords: T1-995 ; Modeling and Simulation ; System Level Design ; Virtual Prototyping ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Mobile laser scanning based determination of railway network topology and branching direction on turnouts (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: GNSS is often inaccurate and satellite signals are not always available, which results in ambiguous situations. In order to reduce their negative effects on train-borne localization, this work proposes an approach for the detection of tracks, turnouts, and branching directions solely from 2d lidar sensor measurements. The experimental evaluation shows highly correct and complete results. In summary, these detections are sufficient to reduce ambiguity problems in train-borne localization.
    Keywords: T1-995 ; lidar-basierte Eisenbahn-Infrastruktur-Detektion (Schienen ; Gleise ; lidar based railway infrastructure detection (rails ; bordautonome Lokalisierung ; Topologie- und Befahrrichtungserkennung ; determination of topology and branching direction ; train-borne localization ; Weichen) ; turnouts) ; tracks ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    New contributions to R-curves and bridging stresses - Applications of weight functions (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Most ceramics show an increase of the crack growth resistance during crack propagation (R-curve behaviour). Reasons for such behaviour are bridging effects between opposite crack surfaces, phase transformations around the tip of a crack, and development of micro-cracking zones. This booklet predominantly deals with the bridging behaviour and the discussion of the observed effects in terms of the fracture mechanics weight function procedure.
    Keywords: T1-995 ; Bridging stresses ; Crack-growth resistance ; weight function ; silicon nitride ; Siliziumnitrid ; R-curve ; Keramik ; R-Kurven ; Gewichtsfunktionen ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Experimental Investigation of Crack Initiation in Face-Centered Cubic Materials in the High and Very High Cycle Fatigue Regime (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This book investigates the fatigue mechanisms and crack initiation of Ni, Al and Cu on a small-scale in the Very High Cycle Fatigue regime by means of innovative fatigue experimentation. A novel custom-built resonant fatigue setup showed that the sample resonant frequency changes with increasing cycle number due to fatigue damage. Mechanisms such as slip band formation have been observed. Cyclic hardening, vacancy and oxidation formation may be considered as early fatigue mechanisms.
    Keywords: T1-995 ; Ermüdung ; Rissinitiierung ; kubisch flächenzentriert ; unendliche Lebensdauercrack initiation ; infinite lifetime ; very high cycle fatigue ; face-centered cubic ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Throughput Analysis of Manual Order Picking Systems with Congestion Consideration (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Throughput in manual order picking systems with narrow aisles suffers from congestion as pickers cannot pass each other. Only few models incorporate congestion but they have very strict assumptions. In this work, queueing theory is used to analyze systems with traversal routing as well as different storage policies. The models are able to estimate throughput for many alternative designs in a relatively short amount of time. New guidelines for narrow-­aisle order picking systems are introduced.
    Keywords: T1-995 ; Order Picking ; Blocking ; Queueing Theory ; Congestion ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Interlacing Self-Localization, Moving Object Tracking and Mapping for 3D Range Sensors (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work presents a solution for autonomous vehicles to detect arbitrary moving traffic participants and to precisely determine the motion of the vehicle. The solution is based on three-dimensional images captured with modern range sensors like e.g. high-resolution laser scanners. As result, objects are tracked and a detailed 3D model is built for each object and for the static environment. The performance is demonstrated in challenging urban environments that contain many different objects.
    Keywords: T1-995 ; mapping ; self-localization ; object detection ; laser scanner ; tracking ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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  • 78
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    Thermomechanical Mean-Field Modeling and Experimental Characterization of Long Fiber-Reinforced Sheet Molding Compound Composites (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: A discontinuous fiber-reinforced thermoset material produced by the Sheet Molding Compound process is investigated. Due to the process-related fiber orientation distribution, a composite with an anisotropic microstructure is created which crucially affects the mechanical properties. The central objectives are the modeling of the thermoelastic behavior of the composite accounting for the underlying microstructure, and the experimental characterization of the pure resin and the composite material.
    Keywords: T1-995 ; Dynamisch-mechanische Analyse ; Thermoelastic properties ; Langfaserverstärkter Komposit ; Mean- und Full-Field Homogenisierung ; Thermoelastische Eigenschaften ; Long fiber-reinforced composite ; Mean- and full-field homogenization ; Dynamic mechanical analysis ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Physically based Impedance Modelling of Lithium-Ion Cells (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book, a new procedure to analyze lithium-ion cells is introduced. The cells are disassembled to analyze their components in experimental cell housings. Then, Electrochemical Impedance Spectroscopy, time domain measurements and the Distribution function of Relaxation Times are applied to obtain a deep understanding of the relevant loss processes. This procedure yields a notable surplus of information about the electrode contributions to the overall internal resistance of the cell.
    Keywords: T1-995 ; Lithium-Ionen Zelle ; lithium-ion cell ; impedance spectroscopy ; Modell ; distribution of relaxation times ; Verteilung der Relaxationszeiten ; loss processes ; Impedanzspektroskopie ; model ; Verlustprozesse ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Characterization and Modeling of Electrochemical Energy Conversion Systems by Impedance Techniques (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This thesis introduces (i) amendments to basic electrochemical measurement techniques in the time and frequency domain suitable for electrochemical energy conversion systems like fuel cells and batteries, which enable shorter measurement times and improved precision in both measurement and parameter identification, and (ii) a modeling approach that is able to simulate a technically relevant system just by information gained through static and impedance measurements of laboratory size cells.
    Keywords: T1-995 ; Lithium-Ion Battery (LIB) ; Solid Oxide Fuel Cell (SOFC) ; Electrochemical Impedance Spectroscopy (EIS) ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Solving the inverse problem of electrocardiography in a realistic environment (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Heart disease is a leading cause of death worldwide. Straightforward information about the cardiac electrophysiology can help to improve the quality of diagnosis of heart diseases. The inverse problem of electrocardiography and the intracardiac catheter measurement are two ways to get access to the electrophysiology in the heart. In this thesis six research topics related to these two techniques are included.
    Keywords: T1-995 ; premature ventricular contraction ; inverse problem of electrocardiography ; myocardial infarction ; ECG measurement system ; intracardiac mapping ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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  • 82
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    Stress Intensity Factors - T-Stresses - Weight Functions (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Failure of cracked components is governed by the stresses in the vicinity of the crack tip. The singular stress contribution is characterised by the stress intensity factor K, the first regular stress term is represented by the so-called T-stress. Sufficient information about the stress state is available, if these two parameters are known Results for K and T are compiled in form of figures, tables, and approximate relations.
    Keywords: T1-995 ; Cracks ; stress intensity factor ; stress fields ; T-stress ; fracture mechanics ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Geometrically exact theory for contact interactions (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The intuitive understanding of contact bodies is based on the geometry and adjoining surfaces. A powerful approach to solve the contact problem is to take advantage of the geometry of an analyzed object and describe the problem in the best coordinate system. This book is a systematical analysis of geometrical situations leading to contact pairs: suface-to-surface, curve-to-surface, point-to-surface a.s.o. resultingin the corresponding computational algorithms to solve the contact problem.
    Keywords: T1-995 ; geometrical methods in mechanics ; computatiobal contact mechanics ; covariant contact description ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Analysis and design of multiple element antennas for urban communication (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: This work focuses on the analysis and design of multiple element antennas (MEA) and their interaction with the propagation channel. In particular, attention is given to urban channels and how its information throughput, i.e. capacity, can be improved. With this in mind, this work extends an existing network model of the communication system in order to reduce computation time, investigates the communicational limits of MEA systems and proposes a synthesis method for capacity maximization.
    Keywords: T1-995 ; Capacity maximization ; Multiple Element Antennas ; MIMO ; Antenna Synthesis ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Phase-field modeling of microstructural pattern formation in alloys and geological veins (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: With the advent of high performance computing, the application areas of the phase-field method, traditionally used to numerically model the phase transformation in metals and alloys, have now spanned into geoscience. A systematic investigation of the two distinct scientific problems in consideration suggest a strong influence of interfacial energy on the natural and induced pattern formation in diffusion-controlled regime.
    Keywords: T1-995 ; Oberflächenenergie ; GesteinsadernMultiphase-field model ; Interfacial energy ; Veins ; Multiphasenfeldmodell ; Eutektoider Umwandlungen ; Eutectoid transformations ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Diagnostics of Short Electron Bunches with THz Detectors in Particle Accelerators (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Several novel diagnostic systems based on the detection of coherent THz radiation are presented. The investigation of the photon beam properties allow for bunch-by-bunch and turn-by-turn diagnostics of the emitting electron bunches in the accelerator. It is used for time-resolved studies of the micro-bunching instability. Accompanying simulations with Inovesa show a good agreement with the measurement which enhances the knowledge of the physics behind the micro-bunching instability.
    Keywords: T1-995 ; Spektrum ; Synchrotronstrahlung ; THz ; Impedanz ; Terahertz ; Impedance ; Synchrotron radiation ; Spectrum ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Numerical efficiency calibration of in vivo measurement systems : Monte Carlo simulations of in vivo measurement scenarios for the detection of incorporated radionuclides, including validation, analysis of efficiency-sensitive parameters and customized anthropomorphic voxel models (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Monte Carlo radiation transport codes were used with virtual models of in vivo measurement equipment. Software was coded to handle memory intensive anthropomorphic voxel models for simulation of measurement scenarios. Tools, methods and models have been validated. Various parameters have been investigated for their sensitivity. Methods based on image registration techniques have been developed to transform existing human models to match with an individual test person.
    Keywords: T1-995 ; voxel model ; efficiency calibration ; in vivo measurement ; Monte Carlo radiation transport simulations ; incorporated radionuclides ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Probabilistic Maneuver Recognition in Traffic Scenarios (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this work an approach is presented to model and recognize traffic maneuvers in terms of interactions between different traffic participants on extra urban roads. Results of the recognition concept are presented and evaluated using different sensor setups and its benefit is outlined by an integration into a software framework in the field of Car-to-Car (C2C) communications. Furthermore, recognition results are used in this work to robustly predict vehicle’s trajectories while driving dynamic
    Keywords: T1-995 ; Nachrichtenverifizierung ; Trajectory Prediction ; Maneuver Recognition ; Probabilistic Models ; Message Verification ; Situationsanalyse ; Probabilistische Modellierung ; TrajektorienprädiktionSituation Assessment ; Fahrmanövererkennung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Wireless Data Transmission for the Battery Management System of Electric and Hybrid Vehicles (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This work introduces a novel wireless approach for the data transmission within automotive battery management systems. The main target is the reduction of the wiring harness deployed in a battery. The characteristics of the wireless in-battery channel are investigated by means of measurements and software-based electromagnetic simulations. Different types of antennas and frequency bands are analyzed. The performance of the proposed system is evaluated by means of simulations and prototypes.
    Keywords: T1-995 ; HF-Messung ; Battery Management System ; Drahtlose Kommunikation ; Electromagnetic Simulation ; Antenne ; Wireless Communications ; Batteriemanagementsystem ; Elektromagnetische Simulation ; RF Measurement ; Antenna ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Resonant Behaviour of Pulse Generators for the Efficient Drive of Optical Radiation Sources Based on Dielectric Barrier Discharges (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Dielectric barrier discharge (DBD) excimer lamps emit vacuum-UV optical radiation. This work presents novel methods for efficiently operating DBDs with short, high-voltage pulses. Transformer-less systems utilising SiC power semiconductor switches are presented. Pulse frequencies of up to 3.1 MHz and peak inverter efficiencies of 92 % were achieved. The work encloses both mathematical backgrounds of pulsed resonant circuits and practical implementation of low-inductive power stages.
    Keywords: T1-995 ; low inductance ; high frequency ; high voltage ; Silicon Carbide ; gate drive ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
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    Optically Powered Highly Energy-efficient Sensor Networks (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: In optically powered networks, both, communication signals and power for remotely located sensor nodes, are transmitted over an optical fiber. Key features of optically powered networks are node operation without local power supplies or batteries as well as operation with negligible susceptibility to electro-magnetic interference and to lightning. In this book, different kinds of optically powered devices and networks are investigated, and selected applications are demonstrated.
    Keywords: T1-995 ; powered ; Optically ; sensor ; network ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    Millimeter-Precision Laser Rangefinder Using a Low-Cost Photon Counter (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book we successfully demonstrate a millimeter-precision laser rangefinder using a low-cost photon counter. An application-specific integrated circuit (ASIC) comprises timing circuitry and single-photon avalanche diodes (SPADs) as the photodetectors. For the timing circuitry, a novel binning architecture for sampling the received signal is proposed which mitigates non-idealities that are inherent to a system with SPADs and timing circuitry in one chip.
    Keywords: T1-995 ; Photonenzähler ; Laser-EntfernungsmessgerätDistance measurement ; SPAD ; laser rangefinder ; Entfernungsmessung ; LIDAR ; photon counter ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Automatic Reconstruction of Textured 3D Models (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Three dimensional modeling and visualization of environments is an increasingly important problem. This work addresses the problem of automatic 3D reconstruction and we present a system for unsupervised reconstruction of textured 3D models in the context of modeling indoor environments. We present solutions to all aspects of the modeling process and an integrated system for the automatic creation of large scale 3D models.
    Keywords: T1-995 ; Robotik Rekonstruktion Modellierung Registering SLAMRobotics Reconstruction Modeling Registration SLAM ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Microstructural stability of nanostructured fcc metals during cyclic deformation and fatigue (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Nanostructured metals with maximal grain or twin sizes of less than 100 nm have advanced properties like increased strength.As beneficial as these microstructures can be for the strength of materials, they are not infinitely stable. During mechanical loading these metals tend to coarsen and lose their beneficial structure. Besides electron microscopic analysis of fatigued samples, in situ cycling tests were conducted in order to observe structural degradation during mechanical loading.
    Keywords: T1-995 ; fatigue ; nanostructured metals ; electron microscopy ; in situ ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    An Optical Grooming Switch for High-Speed Traffic Aggregation in Time, Space and Wavelength (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book a novel optical switch is designed, developed, and tested. The switch integrates optical switching, transparent traffic aggregation/grooming, and optical regener-ation. Innovative switch subsystems are developed that enable these functionalities, including all-optical OTDM-to-WDM converters. High capacity ring interconnection between metro-core rings, carrying 130 Gbit/s OTDM traffic, and metro-access rings carring 43 Gbit/s WDM traffic is experimentally demonstrated. The developed switch features flexibility in bandwidth provisioning, scalability to higher traffic volumes, and backward compatibility with existing network implementations in a future-proof way.
    Keywords: T1-995 ; All-Optical Regeneration ; Traffic Grooming and Aggregation ; Time Division Multiplexing ; Optical Communications ; Wavelength Division Multiplexing ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Milk Run Design: Definitions, Concepts and Solution Approaches (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Efficient inbound networks in the European automotive industry rely on a set of different transport concepts including milk runs - understood as regularly scheduled pickup tours. The complexity of designing such a mixed network makes decision support necessary: In this book we provide definitions, mathematical models and a solution method for the Milk Run Design problem and introduce indicators assessing the performance of established milk runs in relation to alternative transport concepts.
    Keywords: T1-995 ; Mathematical Optimization ; Supply Chain Management ; Lean Manufacturing ; Mathematische Optimierung ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    Nanoscale investigation of potential distribution in operating Cu(In,Ga)Se2 thin-film solar cells (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The distribution of the electrostatic potential in and between the materials in Cu(In,Ga)Se2 thin-film solar cells has a major impact on their superior performance. This thesis reported on the nanoscale imaging of the electrostatic potential on untreated cross sections of operating Cu(In,Ga)Se2 solar cells using Kelvin probe force microscopy.
    Keywords: T1-995 ; electrostatic potential distribution ; CIGS ; thin-film solar cell ; KPFM ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    Terabit-Rate Transmission Using Optical Frequency Comb Sources (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: Energy-efficient Tbit/s optical interconnects are key elements for future communication systems. Three novel optical frequency comb sources are investigated, which have the potential of being integrated in chip-scale Tbit/s transmitters. Such frequency combs provide a large number of carriers. The equidistance of the comb lines helps to minimize spectral guard bands. For each type of comb source, coherent data transmission experiments show the potential for Tbit/s data transmission rates.
    Keywords: T1-995 ; kohärent ; Terabit ; coherent ; data transmittion ; Datenübertragung ; optische Frequenzkammquelle ; Optical Frequency comb ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    Modelling the plastic deformation of iron (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2023-12-21
    Description: The 1/2〈111〉 screw dislocations in bcc iron are studied by atomistic simulations. An analytical yield criterion captures correctly the non-Schmid plastic behavior. A model Peierls potential develops a link between the atomistic modeling at 0 K and the thermally activated dislocation motion. All predicted features agree well with experimental observations. This work establishes a consistent bottom-up model that provides an insight into the microscopic origins of the plastic behavior of bcc iron.
    Keywords: T1-995 ; dislocation ; plastic ; simulation ; yield ; iron ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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    Linear and Nonlinear Semiconductor Optical Amplifiers for Next-Generation Optical Networks (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book, semiconductor optical amplifiers (SOAs) are studied with a view to linear and nonlinear applications in next-generation optical networks. Quantum-dot SOAs can be optimized for linear amplification of signals with different modulation formats and multiplexing techniques. Conversely, bulk SOAs can be easily optimized for operation in the nonlinear regime. However, due to the fast carrier recovery times in QD SOAs we also look into nonlinear applications with these devices.
    Keywords: T1-995 ; wavelength conversion ; semiconductor optical amplifier (SOA) ; reach extender ; quantum-dot ; access network ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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