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  • T1-995  (248)
  • KIT Scientific Publishing  (248)
  • English  (248)
  • Greek, Modern (1453- )
  • Italian
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  • 2020-2024  (248)
  • 2015-2019
  • 2010-2014
  • 1990-1994
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  • 2021  (248)
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Keywords
Publisher
Language
  • English  (248)
  • Greek, Modern (1453- )
  • Italian
  • Portuguese
  • Undetermined
    • +
Years
  • 2020-2024  (248)
  • 2015-2019
  • 2010-2014
  • 1990-1994
  • 1965-1969
    • +
Year
  • 2021  (248)
  • 2017
  • 2016
  • 2014
  • 2010
    • +
  • 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
    Language: English
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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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