Примерная тематика дипломных работ

In this paper,a comparative study of various transistors dedicated to low phase noise S to X bands oscillator design is proposed.Then,a transistor selection factor for low phase noise oscillator design is introduced

Needs for large mass prototypic corium experiments the PLINIUS-2 platform

International audienceCorium is the molten material formed after meltdown of a nuclear reactor core during a severe accident. In order to improve the understanding and modelling of corium behavior, experiments are needed both for LWRs and GenIV fast reactors. Experiments using low temperature simulant materials, thanks to lower costs and constraints, allow the testing of a larger number of configurations and the determination of correlations. But some crucial corium phenomena cannot be reproduced at low temperatures such as the importance of radiation heat transfer or the presence of a large (up to 1000 K) liquidus-solidus interval. Consequently, some experiments are performed with high temperature simulant materials alumina thermite as well as refractory oxides. However, it is not feasible to simulate all the aspects of corium phenomenology, especially its high temperature physico-chemistry. Therefore, even though the use of depleted uranium implies a series of protective and regulatory measures, the need for prototypic corium experimented is supported through several examples Another important aspect of experiment design deals with scaling. Small or medium scale corium experiments are easier to operate and only a few large scale (>100 kg) facilities have been built. Several effects are only visible with significant masses, as for instance, the formation of a corium cake during FCI or all the phenomena controlled by crust strength, such as underwater spreading or corium jet ablation. CEA is currently designing a new large prototypic corium platform PLINIUS-2 for both LWR and SFR corium experimental research. Its main characteristics will be presented

Comparison between the Short Story Task and the Reading the Mind in the Eyes Test for evaluating Theory of Mind: A replication report

Introduction The ability to attribute emotional states, beliefs, and intentions to others has been termed Theory of Mind (ToM), mentalizing, and mind reading. The purpose of this study was to find an instrument to measure ToM in the Mexican population, that would yield similar results to those obtained in other cultures, and could discriminate between individuals. To achieve this objective, we replicated a study which compared two measures of ToM in a sample of English-speaking, neurologically intact adults. Methods A sample of young Mexican adults (n = 118) was evaluated on the Reading the Mind in the Eyes Test (RMET) and a test that uses naturalistic narrative stimuli, the Short Story Task (SST), and on tests of general cognitive ability, executive functions, and empathy. Results We found a significant correlation between the ToM tests, and both tests correlated with verbal ability, general cognitive ability, and empathy, similar to what was seen in a previous study. Both tests discriminated between individuals and were challenging enough that we found no perfect scores. Conclusions These results show that both the RMET, which taps into emotion recognition and its categorization with language, and the SST, which relies on narrative fiction to test the ability to interpret mental states, show concurrent validity in a sample of neurologically intact young adults from a Latin-American culture; these tests may be useful in the clinical setting and for basic research into ToM

DISCOMS : Capteurs Répartis pour le surveillance du corium et la sûreté

International audienceThe Fukushima-Daiichi nuclear disaster showed that the need for safety must always prevail. This paper discusses the development of remote monitoring technologies to improve Nuclear Power Plants (NPPs) safety, in operation (Pressurized Water Reactors), under construction (the EPR reactors, i.e. the GEN 3 PWR), or for any other next generations of reactors. At Fukushima, the total loss of electrical power supplies has quickly led most of the instrumentation inoperative and the operator (TEPCO) with no way to monitor the status and the evolution of the accident. To overcome these important drawbacks, advantage can be taken from the considerable potential of distributed sensing technologies based on both "Optical Fiber Sensors" (Raman, Brillouin, and Rayleigh Reflectometries) and long-length "Self Powered Neutron Detectors" (SPNDs). The goal consists in inquiring about the status of the third barrier of confinement and to define possible mitigation strategies in case of severe accident, namely: i) reactor pressure vessel breakthrough and corium relocation outside the vessel, ii) concrete basemat erosion and iii) corium cooling. Such monitoring should consist in "sensing cables" embedded in concrete basemat below the reactor vessel and interrogated from a rear base where operators can work safely. In this context, DISCOMS, which stands for "DIstributed Sensing for COrium Monitoring and Safety", is a five-year project, managed by the French National Research Agency (ANR), dealing with the NPP safety improvement, from normal situation to severe accidents. Monitoring phases include reactor vessel breaching, corium flow, along with post-accidental period (corium cooling ex-vessel). Thus, optical fibers selected for their resistance to ionizing radiations and long length SPNDs, both judiciously deployed within the reactor concrete basemat, and the structures around it, will provide a useful real-time or on-demand monitoring, in normal operation, and more important in accidental and post-accidental situations