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Temperature- and Time-Dependent Dielectric Measurements and Modelling on Curing of Polymer Composites
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.
VEIC 2020
This book constitutes the thoroughly internationally - refereed proceedings of the 2nd Vocational Educational International Conference: Revitalization of Vocational Education in Indonesia, 2020, held in Semarang, Indonesia, in August 27, 2020. The papers presented were carefully reviewed and selected from all submissions. The papers reflect the conference sessions as follows: Innovation In Building and Developing Vocational Education, Innovation In Preparing and Developing Educators In Vocational Education, Innovation In Preparing and Developing Skilled Workers, and Developing Students Competencies Using E-learning.
Desain Dan Integrasi Smart Microgrid Dengan Stasiun Pengisian Kendaraan Listrik Berbasis Sistem Cerdas Di Area Kampus
Puji syukur penulis sampaikan kehadirat Allah SWT, Karena atas segala rahmat dan karunianya penulis dapat menyelesaikan buku dari hasil penelitian dengan judul “Desain dan Optimasi Smart Microgrid Berbasis Sistem Cerdas Di Area Kampus”. Shalawat serta salam semoga selalu terlimpah curahkan kepada baginda tercinta kita yakni Nabi Muhammad SAW. Buku ini ditulis dan disajikan untuk memberikan tambahan bahan rujukan para peneliti dan pembaca agar dapat memperluas wawasan mengenai desain dan optimasi Smart Microgrid yang berbasis sistem cerdas khususnya di area kampus. Buku ini disusun oleh tim penulis berdasarkan pada hassil penelitian dan pengembangan di Teknik Elektro Universitas Negeri Semarang. Berbagai rintangan baik yang datang dari diri penulis maupun dari luar mampu terlewati berkat pertolongan dari berbagai pihak terutama dari Allah SWT sehingga buku ini akhirnya dapat terselesaikan.
Energy-efficient, scalable and modular industrial microwave applicator for high temperature alkaline hydrolysis of PET
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.
Automated Mode Recovery and Electronic Stability Control for Wendelstein 7-X Gyrotrons
Magnetic confinement fusion relies on plasma heating and plasma control using gyrotron oscillators providing at megawatt power levels. The operational reliability decreases when operating at the performance limits due to increasing parasitic mode activity. This work demonstrates for the first time the automated, fast recovery of nominal gyrotron operation during a pulse by exploiting the hysteretic gyrotron behaviour after a mode switch being in use at the Wendelstein 7-X ECRH facility.
Feasibility and Operational Limits for a 236 GHz Hollow-Cavity Gyrotron for DEMO
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.
Pushing the KIT 2 MW Coaxial-Cavity Short-Pulse Gyrotron Towards a DEMO Relevant Design
Magnetic fusion is one approach to generate thermonuclear fusion power in an environmental friendly way. The Electron Cyclotron Resonance Heating is considered as the major concept for startup, heating and control of the fusion plasma. Megawatt-class gyrotrons generate the required microwave power. This work focuses on advanced key components and technologies for a DEMO relevant 2 MW gyrotron. One major focus is on the development of advanced Magnetron Injection Guns. Another focus is on the red
Influence of Emitter Surface Roughness and Emission Inhomogeneity on Efficiency and Stability of High Power Fusion Gyrotrons
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.
Systematic Study of Key Components for a Coaxial-Cavity Gyrotron for DEMO
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.
