Temperature And Time Dependent Dielectric Measurements And Modelling On Curing Of Polymer Composites

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Temperature And Time Dependent Dielectric Measurements And Modelling On Curing Of Polymer Composites

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Author : Prastiyanto, Dhidik
language : en
Publisher: KIT Scientific Publishing
Release Date : 2016-03-15

Temperature And Time Dependent Dielectric Measurements And Modelling On Curing Of Polymer Composites written by Prastiyanto, Dhidik and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-03-15 with Dielectric measurements categories.

In this book a test set for dielectric measurements at 2.45 GHz during curing of polymer composites is developed. Fast reconstruction is solved using a neural network algorithm. Modeling of the curing process at 2.45 GHz using both dielectric constant and dielectric loss factor results in more accurate model compared to low frequency modelling that only uses the loss factor. Effect of various hardeners and different amount of filler is investigated.

Temperature And Time Dependent Dielectric Measurements And Modelling On Curing Of Polymer Composites

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Author : Dhidik Prastiyanto
language : en
Publisher:
Release Date : 2020-10-09

Temperature And Time Dependent Dielectric Measurements And Modelling On Curing Of Polymer Composites written by Dhidik Prastiyanto and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-09 with Science categories.

In this book a test set for dielectric measurements at 2.45 GHz during curing of polymer composites is developed. Fast reconstruction is solved using a neural network algorithm. Modeling of the curing process at 2.45 GHz using both dielectric constant and dielectric loss factor results in more accurate model compared to low frequency modelling that only uses the loss factor. Effect of various hardeners and different amount of filler is investigated. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Design And Experimental Investigation Of A Second Harmonic 20 Kw Class 28 Ghz Gyrotron For Evaluation Of New Emitter Technologies

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Author : Malygin, Anton
language : en
Publisher: KIT Scientific Publishing
Release Date : 2016-12-16

Design And Experimental Investigation Of A Second Harmonic 20 Kw Class 28 Ghz Gyrotron For Evaluation Of New Emitter Technologies written by Malygin, Anton and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-16 with Technology (General) categories.

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 %.

Multphysics Modelling Towards The Stabilization Of Pan Fibers With Microwaves Based On Experimental Data

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Author : Hofele, Julia
language : en
Publisher: KIT Scientific Publishing
Release Date : 2024-07-10

Multphysics Modelling Towards The Stabilization Of Pan Fibers With Microwaves Based On Experimental Data written by Hofele, Julia and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-10 with categories.

High energy demand is one reason for high costs of carbon fibers. One option to decrease them is to use microwave heating instead of conventional heating. In this work, steps towards a microwave assisted process during the stabilization phase are presented. In-situ dielectric measurements are performed and a reaction kinetics model is setup in connection to the dielectric loss. This allows to calculate a stabilization degree and fiber temperatures leading to a basic process understanding.

Adaptive And Intelligent Temperature Control Of Microwave Heating Systems With Multiple Sources

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Author : Sun, Yiming
language : en
Publisher: KIT Scientific Publishing
Release Date : 2016-04-28

Adaptive And Intelligent Temperature Control Of Microwave Heating Systems With Multiple Sources written by Sun, Yiming and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-28 with Technology (General) categories.

In this work, an innovative real-time microwave control approach is proposed, to improve the temperature homogeneity under microwave heating. Multiple adaptive or intelligent control structures have been developed, including the model predictive control, neural network control and reinforcement learning control methods. Experimental results prove that these advanced control methods can effectively reduce the final temperature derivations and improve the temperature homogeneity.

A First 2 Mw Class 136 170 204 Ghz Multi Frequency Gyrotron Pre Prototype For Demo Design Construction And Key Components Verification

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Author : Ruess, Tobias
language : en
Publisher: KIT Scientific Publishing
Release Date : 2023-10-26

A First 2 Mw Class 136 170 204 Ghz Multi Frequency Gyrotron Pre Prototype For Demo Design Construction And Key Components Verification written by Ruess, Tobias and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-26 with categories.

Ein Gyrotron wird in magnetisch eingeschlossenen Plasmaexperimenten für Heizung, Stromtrieb, Plasmastabilisierung und Plasmadiagnostik verwendet. In dieser Arbeit wird der erste Entwurf und Bau eines Mehrfrequenz-/Mehrzweck Pre-Prototyp Gyrotrons in koaxialer Technologie vorgestellt, das bei (136)/170/204 GHz mit einer Ausgangsleistung von 2 MW arbeitet. Dies ist der erste Schritt zum Betrieb bei Frequenzen bis zu 240 GHz unter Verwendung der Koaxialhohlraum-Gyrotrontechnologie. - A gyrotron is used in magnetically confined plasma experiments for heating, current drive, plasma stabilization and plasma diagnostics. This work presents the first design and construction of a multi-frequency / multi-purpose coaxial-cavity pre-prototype gyrotron operating at (136)/170/204 GHz with an output power of 2 MW. It is the first step towards operating frequencies up to 240 GHz using the coaxial-cavity gyrotron technology.

Energy Efficient Scalable And Modular Industrial Microwave Applicator For High Temperature Alkaline Hydrolysis Of Pet

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Author : Ramopoulos, Vasileios
language : en
Publisher: KIT Scientific Publishing
Release Date : 2023-01-27

Energy Efficient Scalable And Modular Industrial Microwave Applicator For High Temperature Alkaline Hydrolysis Of Pet written by Ramopoulos, Vasileios and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-27 with Technology & Engineering categories.

Microwave-assisted alkaline hydrolysis of PET can be 20 times faster and at lower temperatures. This work presents a novel industrial microwave applicator at 2.45 GHz with homogeneous distribution to support this reaction, which allows an efficient and continuous operation. In addition, an innovative dielectric and calorimetric measurements setup is presented. Furthermore, the modelling of the reaction kinetics based on the measured dielectric parameters is presented.

Systematic Study Of Key Components For A Coaxial Cavity Gyrotron For Demo

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Author : Franck, Joachim
language : en
Publisher: KIT Scientific Publishing
Release Date : 2017-05-11

Systematic Study Of Key Components For A Coaxial Cavity Gyrotron For Demo written by Franck, Joachim and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-11 with Technology (General) categories.

The physical design of cavity and magnetron injection gun (MIG) for a realistic, DEMO-compatible, coaxial-cavity 238 GHz 2 MW CW fusion gyrotron is developed in this work, having auxiliary frequencies at 170 GHz and 204 GHz. Novel systematic approaches towards multi-frequency mode selection, magnet requirements, and MIG design are presented. Mode deterioration and voltage depression variation due to insert misalignment versus cavity wall and/or versus electron beam are studied.

Influence Of Emitter Surface Roughness And Emission Inhomogeneity On Efficiency And Stability Of High Power Fusion Gyrotrons

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Author : Zhang, Jianghua
language : en
Publisher: KIT Scientific Publishing
Release Date : 2016-11-30

Influence Of Emitter Surface Roughness And Emission Inhomogeneity On Efficiency And Stability Of High Power Fusion Gyrotrons written by Zhang, Jianghua and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-30 with Technology (General) categories.

The increasing demand for powerful, reliable, and efficient gyrotron oscillators for Electron Cyclotron Resonance Heating (ECRH) in fusion plasma experiments requires a close look at the various factors in gyrotrons that determine gyrotron performance. In this frame, the influence of emitter surface roughness, emission inhomogeneity, and secondary electron generation on gyrotron operation is presented, with focus on Low Frequency Oscillations (LFOs) and Electron Beam Halo (EBH) generation.

New Type Of Sub Thz Oscillator And Amplifier Systems Based On Helical Type Gyro Twts

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Author : Marek, Alexander
language : en
Publisher: KIT Scientific Publishing
Release Date : 2023-01-26

New Type Of Sub Thz Oscillator And Amplifier Systems Based On Helical Type Gyro Twts written by Marek, Alexander and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-26 with Technology & Engineering categories.

This work presents the development of a new sub-THz source for the generation of trains of coherent high-power ultra-short pulses at 263 GHz via passive mode-locking of two coupled helical gyro-TWTs. For the first time, it is shown that the operation of such passive mode-locked helical gyro-TWTs in the hard excitation regime is of particular importance to reach the optimal coherency of the generated pulses. This could be of particular interest for some new time-domain DNP-NMR methods.