Comparing the new generation accelerator driven subcritical reactor system (ADS) to traditional critical reactors

2017 ◽  
Author(s):  
Elif Kemah ◽  
Recep Akkaya ◽  
Seyit Rıza Tokgöz
Keyword(s):  
Reactor System ◽  
New Generation ◽  
Subcritical Reactor

scholarly journals Power spectral analysis for a thermal subcritical reactor system driven by a pulsed 14 MeV neutron source

2013 ◽  
Vol 50 (5) ◽  
pp. 481-492 ◽  
Author(s):  
Atsushi Sakon ◽  
Kengo Hashimoto ◽  
Wataru Sugiyama ◽  
Hiroshi Taninaka ◽  
Cheol Ho Pyeon ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Neutron Source ◽  
Power Spectral Analysis ◽  
Reactor System ◽  
Power Spectral ◽  
Subcritical Reactor

Feynman-α Analysis for a Thermal Subcritical Reactor System Driven by an Unstable 14MeV Neutron Source

2011 ◽  
Vol 48 (9) ◽  
pp. 1272-1280 ◽  
Author(s):  
Hiroshi TANINAKA ◽  
Atsuko MIYOSHI ◽  
Kengo HASHIMOTO ◽  
Cheol Ho PYEON ◽  
Tadafumi SANO ◽  
...  
Keyword(s):  
Neutron Source ◽  
Reactor System ◽  
14Mev Neutron ◽  
Subcritical Reactor

scholarly journals Simulation of transients in ads reactors in three-dimensional geometry

2021 ◽  
Vol 9 (2B) ◽  
Author(s):  
José Rafael Nicolao Carneiro ◽  
Zelmo Rodrigues De Lima ◽  
Alessandro Da Cruz Gonçalves
Keyword(s):  
Three Dimensional ◽  
Particle Accelerator ◽  
Neutron Diffusion ◽  
Delayed Neutron ◽  
Driven System ◽  
The Subject ◽  
Accelerator Driven System ◽  
Critical Reactor ◽  
New Generation ◽  
Subcritical Reactor

Accelerator-Driven System, ADS, belong to the new generation of advanced reactors being developed that promise to drastically reduce the life of radioactive waste by, for example, the transmutation process. Subcritical reactor designs of the ADS type have attracted worldwide attention and are the subject of research and development in several countries. The purpose of this work is to simulate transients associated with ADS. It adopted the neutron diffusion model that leads the spatial kinetics equations. These equations are solved by the known numerical method of finite differences. The simulations are performed considering transients related to the variations in the intensity of the proton flux provided by the particle accelerator acting in a sub-critical reactor in three-dimensional geometry for two energy groups and six groups of delayed neutron precursors.

Finding the Right Problems: Some HREM Applications to Interfaces

1984 ◽  
Vol 42 ◽  
pp. 376-379
Author(s):  
D. Cherns
Keyword(s):  
Grain Boundaries ◽  
High Resolution Electron Microscopy ◽  
Boundary Structure ◽  
Atomic Structures ◽  
Grain Boundary Structure ◽  
Resolution Electron ◽  
Point To Point ◽  
The Right ◽  
New Generation ◽  
Better Than

The use of high resolution electron microscopy (HREM) to determine the atomic structure of grain boundaries and interfaces is a topic of great current interest. Grain boundary structure has been considered for many years as central to an understanding of the mechanical and transport properties of materials. Some more recent attention has focussed on the atomic structures of metalsemiconductor interfaces which are believed to control electrical properties of contacts. The atomic structures of interfaces in semiconductor or metal multilayers is an area of growing interest for understanding the unusual electrical or mechanical properties which these new materials possess. However, although the point-to-point resolutions of currently available HREMs, ∼2-3Å, appear sufficient to solve many of these problems, few atomic models of grain boundaries and interfaces have been derived. Moreover, with a new generation of 300-400kV instruments promising resolutions in the 1.6-2.0 Å range, and resolutions better than 1.5Å expected from specialist instruments, it is an appropriate time to consider the usefulness of HREM for interface studies.

Total etch dentin bonding systems: scanning electron microscopy of the resin-dentin hybrid layer

1992 ◽  
Vol 50 (2) ◽  
pp. 1092-1093
Author(s):  
Jorge Perdigao
Keyword(s):  
Composite Resin ◽  
Mechanical Interlocking ◽  
Hybrid Layer ◽  
Agent Based ◽  
Dentin Bonding ◽  
Acid Agent ◽  
Bond Strengths ◽  
Main Component ◽  
Bonding Systems ◽  
New Generation

In 1955, Buonocore introduced the etching of enamel with phosphoric acid. Bonding to enamel was created by mechanical interlocking of resin tags with enamel prisms. Enamel is an inert tissue whose main component is hydroxyapatite (98% by weight). Conversely, dentin is a wet living tissue crossed by tubules containing cellular extensions of the dental pulp. Dentin consists of 18% of organic material, primarily collagen. Several generations of dentin bonding systems (DBS) have been studied in the last 20 years. The dentin bond strengths associated with these DBS have been constantly lower than the enamel bond strengths. Recently, a new generation of DBS has been described. They are applied in three steps: an acid agent on enamel and dentin (total etch technique), two mixed primers and a bonding agent based on a methacrylate resin. They are supposed to bond composite resin to wet dentin through dentin organic component, forming a peculiar blended structure that is part tooth and part resin: the hybrid layer.

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