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P. Sauvan,A. Mayoral,J. Sanz,F. Ogando,M. Garcia,D. Lopez 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Some of the current accelerator programs such as TechnoFusion, Spiral2 or EVEDA/IFMIF will use low energy particles such as proton, deuteron and alpha. For these projects, the radioprotection studies require a more reliable prediction of the neutron and photon generated by interaction of these charged particles. In this paper, some developments to address this issue are presented. Except for proton, Monte Carlo codes such MCNPX or PHITS use built-in semi-empirical nuclear models to deal with charged particles interactions. Such models, applied to the above mentioned accelerators beam characteristics (particle type and energy), lead to unreliable prediction of secondary particle production. Consequently, there is a need to both generate accurate evaluated data libraries for light ion nuclear reactions and extend MCNPX to handle the evaluated charged particle nuclear data. The MCNPX code has been extended by the authors to handle proton, deuteron, triton and alpha nuclear data libraries. This tool is here presented and applied to analyse the reliability of available evaluated nuclear data for incident deuterons of energies those used in the abovementioned facilities (up to 40 MeV). Deuteron-induced reactions have been chosen because this particle is expected to be used in all these facilities. Concerning target material, copper has been selected as it is one the main constituents of accelerating components and beam dumps. The evaluated nuclear data are provided by the TENDL library, which is the only one available for deuterons with a wide range of target elements, including those of concern for the accelerators here considered. The testing of the TENDL nuclear data is carried out by comparing existing experimental data on thick target neutron yields for the given materials with those computed by the modified MCNPX code using TENDL cross sections. As a result, the assessment of its applicability to radioprotection studies of those accelerators is discussed.
Ana Boquete-Castro,Juan-Manuel Cortés-Mejía,Raquel Alarcón-Sánchez,Pedro Mayoral-Sanz 대한수면학회 2021 sleep medicine research Vol.12 No.1
Sleep-related breathing disorders increase morbidity and mortality of those patients suffering from them. Snoring is a quite common disorder; however, there are no publications describing the knowledge of the patients that attend to the dental clinic on how snoring can be a severe health problem. To evaluate the knowledge of the severity of snoring and its impact on systemic health among the patients that attend to the dental clinic. Anonymous questionnaires were given to patients at dental clinics in 4 countries. The questionnaires were composed by nine questions related to snoring and how it affects general health in children and adults. A total of 200 subjects participated in this multicentric study. The mean age of the participants was 42.57 years. The results from the present study show that there is a great lack of knowledge on the severity of snoring. Forty-eight percent of the participants affirmed they snore; however, only 20% of the sample think it is important to consult a specialist due to this problem. This study reveals the great lack of knowledge regarding the negative impact of snoring on systemic health and the need of implementing educational programs.
Rozema, J.,Blokker, P.,Fuertes, M.A.Mayoral,Broekman, R. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.9
UV-B absorbing compounds (UACs) in present-day and fossil pollen, spores, cuticles, seed coats and wood have been evaluated as a proxy for past UV. This proxy may not only provide information on variation of stratospheric ozone and solar UV in the period preceding and during the Antarctic ozone hole (1974-present day), but also on the development and variation of the stratospheric ozone layer and solar surface UV during the evolution of life on Earth. Sporopollenin and cutin are highly resistant biopolymers, preserving well in the geological record and contain the phenolic acids p-coumaric (pCA) and ferulic acid (FA). pCA and FA represent a good perspective for a plant-based proxy for past surface UV radiation since they are induced by solar UV-B via the phenylpropanoid pathway (PPP). UV-B absorption by these monomers in the wall of pollen and spores and in cuticles may prevent damage to the cellular metabolism. Increased pCAand FA in pollen of Vicia faba exposed to enhanced UV-B was found in greenhouse experiments. Further correlative evidence comes from UV-absorbing compounds in spores from 1960.2000 comparing exposure of land plants (Lycopodium species) to solar UV before and during ozone depletion and comparing plants from Antarctica (severe ozone depletion), Arctic, and other latitudes with less or negligible ozone depletion. Wood-derived compounds guaiacyl (G), syringyl (S), and p-hydroxyphenyl (P) are produced via the PPP. The proportions of P, G, and S in the lignin differ between various plant groups (e.g. dicotyledons/monocotyledons, gymnosperms/angiosperms). It is hypothesized that this lignin composition and derived physiological and physical properties of lignin (such as tree-ring wood density) has potential as a proxy for palaeo-UV climate. However validation by exposure of trees to enhanced UV is lacking. pCAand FA also form part of cutin polymers and are found in extant and fossil Ginkgo leaf cuticles as shown by thermally-assisted hydrolysis and methylation (THM)-pyrolysis-GC-MS. Potentially, the time scale for reconstruction of ozone column thickness and UV-B based on the UAC UV proxy may be decadal, centennial, millennial and possibly billenial. For further development of the UACs and pCA and FA-based UV proxy, it is necessary to obtain the UV dose.response (content of UACs, pCA and FA in sporopollenin and cutin) relationships for validation, based on outdoor UV radiation manipulations experiments with plants, and comparative analysis of stored plants (herbaria) or fossil material of the same or related plant species.
Mayoral, A.,Min, J.G.,Hong, S.B. Elsevier 2016 Microporous and mesoporous materials Vol.236 No.-
<P>Spherical aberration (C-s) corrected STEM has proved to be an excellent approach for obtaining high resolution images of beam sensitive materials. Using this analytical method, for the first time, we were able to image the structural expansion of four members of the RHO family of embedded isoreticular zeolites along [001] orientation and thus to identify the main constituent cages, conforming their structures. (C) 2016 Elsevier Inc. All rights reserved.</P>