A5055625998- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Microwave Engineering and Waveguides
- Photonic and Optical Devices
- Acoustic Wave Resonator Technologies
- Advanced MEMS and NEMS Technologies
- Nuclear and radioactivity studies
- Radio Frequency Integrated Circuit Design
- Graphite, nuclear technology, radiation studies
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Semiconductor Lasers and Optical Devices
- Speech and Audio Processing
- Radioactive element chemistry and processing
- Radiation Detection and Scintillator Technologies
- Antenna Design and Optimization
- Satellite Communication Systems
- Microplastics and Plastic Pollution
- Metal Alloys Wear and Properties
- Pediatric health and respiratory diseases
- Silicon Nanostructures and Photoluminescence
- Southeast Asian Sociopolitical Studies
- Food Allergy and Anaphylaxis Research
- Molten salt chemistry and electrochemical processes
Vietnam National University, Hanoi
2020-2024
VNU University of Science
2014-2024
University of Sharjah
2023-2024
Thanh Do University
2024
Vietnam Academy of Science and Technology
2022
Ho Chi Minh City University of Technology
2019
Kyoto University
2000-2017
Kyoto University Research Reactor Institute
2017
Osaka University
2013-2015
Centre National de la Recherche Scientifique
2007-2014
At the Kyoto University Critical Assembly, a series of reaction rate experiments is conducted on accelerator-driven system (ADS) with spallation neutrons generated by combined use 100 MeV protons and lead–bismuth target in subcritical state. The rates are measured foil activation method to obtain neutron spectrum information ADS. Numerical calculations performed MCNP6.1 JENDL/HE-2007 for high-energy process, JENDL-4.0 transport JENDL/D-99 rates. That depend subcriticality revealed accuracy...
Basic research on the accelerator-driven system is conducted by combining 235U-fueled and 232Th-loaded cores in Kyoto University Critical Assembly with pulsed neutron generator (14 MeV neutrons) proton beam accelerator (100 protons a heavy metal target). The results of experimental subcriticality are presented wide range level between near critical 10,000 pcm, as obtained source method, Feynman-α multiplication method.
This paper presents a study of RF MEMS switch designed to be integrated in tunable fllters for applications from W-frequency band V-frequency band. Along the whole process, we go into detail each procedure present complete design fabrication and characterization RF-MEMS switch. The proposed concepts are validated by experimental results.
In the previous publication, seed and blanket thorium-reprocessed fuel ADS was designed for efficient transmutation of TRU waste from spent nuclear fuel. this study, multi-cycle core in order to increase thorium utilization transmutation. For that purpose, reprocessed assemblies inside subcritical are shuffled twice burnt while remained reactor until end life. As result, at equilibrium state, contribution total power is improved (35.7%) compared startup cycle it has benefit flattening...
The passband frequency response of the quarter wavelength side-coupled ring resonator can be tuned by adding capacitances along ring. Synthesis has been developed to define capacitor value used so as move central desired value. As shift affects matching level inductance-based network was used, and with inductance determined using specific synthesis. These concepts were validated through experiments for filters which components realized stubs.
The neutron reflector is a material to reflect neutrons into reactor cores. reflectors are designed with their one purpose such as increasing the criticality, specific flux distribution, and others. Generally, design has been conducted by experiences of designers due lots variables selection arrangement. In this study, applicability artificial neural network preliminarily studied for optimization For research, system was developed using C++ program language. feedforward used three layers...
Considering the importance of thorium data and concerning about accuracy Th232 cross section library, a series experiments on critical core with different neutron spectra has been implemented at Kyoto University Critical Assembly (KUCA). Reactivity worth control rod sample was measured after cores experimentally achieved state. In order to verify calculations effective multiplication factor, worth, reactivity Th plates for same configurations were done by MVP code (Nagaya et al., 2005) using...
In this work, we focus on simulating several Wheeler Cap setup for mobile phone-antenna efficiency measurements. Several caps with different shapes, conductivities, distances between their walls and the enclosed antenna are simulated help of full-wave software HFSS. Very interesting results obtained open perspectives like measuring radiation phone antennas which not necessarily electrically small. (6 pages)
A small power ADS design using thorium oxide and diluent matrix reprocessed fuel is proposed for a high transmutation rate, reactivity swing, strong safety features. Two matrices (CERCER CERMET) different recycled compositions recovered from UO2 spent fuels with 45 GWd/tU 60 burnup were investigated to determine the suitable ADS. It was found that of each isotope depends on TRU initial loading amount. After examining cores, results show CERCER fueled has negative coolant void (CVR) smaller...
The choice of membrane technology for filters in W-band was made considering the low dielectric losses observed previous studies. Within this frequency range, constraints related to and technological feasibility limit heavily range achievable impedances. Thus, limits bandwidth broadband filters. Moreover narrowband coupled-lines filters, we were faced with transmission lines shape-factor problems (wider than long). Therefore, have chosen a pseudo-elliptic filter topology which has shown its...
This paper presents a novel tuneable resonator topology from W-frequency band to V-frequency band. The is developed on TFMS structure using RF-MEMs implemented in Si-BCB technology. Specific synthesis are and validated through electromagnetic simulations.
This paper presents a complete study from design to fabrication and characterization of RF-MEMS switch implemented in Si-BCB technology. The topology the is cantilever which will be integrated into tunable filters for applications W-frequency band V-frequency band. Along whole process, attention has been paid correlate simulations (electromagnetic mechanical) technology parameters order ensure reliable model. measured RF performances this component exhibit isolation around 15 dB at 60GHz...
Nuclear power is believed to be a key the energy security for developing country like Vietnam where demanding increases rapidly every year. Nevertheless, spent nuclear fuel from plants source of radiotoxic and proliferation risk. A conceptual design ADS utilizing thorium as based reprocessed seed waste transmutation production proposed one clean, safe, economical solutions problem. In design, 96 assemblies 84 blanket were inserted into core make heterogeneous subcritical configuration....
Abstract This article deals with the design of coplanar waveguide band‐pass filters in W‐band implemented on silicon membrane technology. Several topologies are developed at 94 GHz: broadband stubs, narrow band coupled‐lines, and a pseudo‐elliptical ring. Different concepts validated by electromagnetic simulations HFSS experimental results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1393–1397, 2010; Published online InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25216
Recently, the researches on fast neutron spectrum system utilized thorium fuel are widely conducted. However, recent cross section libraries limited compared to uranium libraries. The impact of uncertainty accelerator driven (ADS) reactivity calculation is estimated in this study. the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msub><mml:mrow><mml:mi>k</mml:mi></mml:mrow><mml:mrow><mml:mtext>eff</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:math>caused...
We propose a novel topology for dual behavior resonator (DBR) allowing greater control of the central frequency. This is used in design self-matching with tunable center frequency which we develop specific synthesis.
Abstract A small modular lead-cooled fast spectrum core concept called Advanced nuclear reactor (ALMANAR) designed to produce 45 MWth power for 22 years operating without refueling was proposed in a previous study. The neutronics investigation showed its excellent inherent safety features. It could be considered as candidate future electricity source the near future. is noteworthy that target accuracy eigenvalue calculation keff regardless of set 300 pcm. However, findings this analysis...
Preserving and promoting traditional cultural values of ethnic minorities associated with livelihood development is especially important for the socio-economic of localities. Over past many years, Dak Lak Province has promptly effectively implemented Party State's guidelines policies on preserving economic development. design, local minorities. However, up to now work associated developing livelihoods still faces difficulties, have not been exploited properly. yet promoted its value...
A low-loss, wide-band 6-bit monolithic microwave integrated circuit (MMIC) digital step attenuator (DSA) for 5G communications is presented. The reduced T-type and switched-path topologies are used to minimize insertion loss achieve operation with small attenuation errors. designed DSA fabricated using 250nm Gallium Arsenide (GaAs) pHEMT process a bare-die size of 2.4 mm x 1.3 mm. On-wafer measurement results in 2.4-7 GHz band show that the exhibits maximum range 31.5 dB steps 0.5 dB,...