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Romero-Barrientos J.,Molina F.,Márquez Damián J.I.,Zambra M.,Aguilera P.,López-Usquiano F.,Parra S. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
In deterministic and Monte Carlo transport codes, b-delayed emission is included using a group structure where all of the precursors are grouped together in 6 groups or families, but given the increase in computational power, nowadays there is no reason to keep this structure. Furthermore, there have been recent efforts to compile and evaluate all the available b-delayed neutron emission data and to measure new and improved data on individual precursors. In order to be able to perform a transient Monte Carlo simulation, data from individual precursors needs to be implemented in a transport code. This work is the first step towards the development of a tool to explore the effect of individual precursors in a fissile system. In concrete, individual precursor data is included by expanding the capabilities of the open source Monte Carlo code OpenMC. In the modified code e named Time Dependent OpenMC or OpenMC(TD)e time dependency related to b-delayed neutron emission was handled by using forced decay of precursors and combing of the particle population. The data for continuous energy neutron cross-sections was taken from JEFF-3.1.1 library. Regarding the data needed to include the individual precursors, cumulative yields were taken from JEFF-3.1.1 and delayed neutron emission probabilities and delayed neutron spectra were taken from ENDF-B/VIII.0. OpenMC(TD) was tested in a monoenergetic system, an energy dependent unmoderated system where the precursors were taken individually or in a group structure, and in a light-water moderated energy dependent system, using 6-groups, 50 and 40 individual precursors. Neutron flux as a function of time was obtained for each of the systems studied. These results show the potential of OpenMC(TD) as a tool to study the impact of individual precursor data on fissile systems, thus motivating further research to simulate more complex fissile systems
Carcass and Meat Quality Traits in an Embden×Toulouse Goose Cross Raised in Organic Dehesa
Sole, M.,Pena, F.,Domenech, V.,Clemente, I.,Polvillo, O.,Valera, M.,Verona, J.C.,Rubi, M.,Molina, A. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.6
This study assessed the influence of genetic type (Embden-Anser anser, EE; Toulouse-Anser anser, TT and F1 cross, ET) for meat characteristics (carcass, meat quality and fatty acid (FA) profiles), of domestic geese "Anser anser domesticus" raised in dehesa as an alternative, organic feeding system. Carcass and breast muscle weight (p<0.01) were greater for the ET group at the same live weight. None of the groups showed differences in the production of fatty liver with this type of feeding. Higher values were found for maximum Warner-Bratzler shear force (between 7.62 and $8.87kg/cm^2$), which implies the improvement of this parameter. High levels of oleic FAs were obtained, especially for the TT group. The polyunsaturated/saturated FA ratio was highest for the ET group (p<0.001), reflecting the optimum nutritional values as a component of a healthy consumer diet.
Calculation of kinetic parameters Beff and with modified open source Monte Carlo code OpenMC(TD)
J. Romero-Barrientos,J.I. Marquez Dami an,F. Molina,M. Zambra,P. Aguilera,F. Lopez-Usquiano,B. Parra,A. Ruiz 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
This work presents the methodology used to expand the capabilities of the Monte Carlo code OpenMC forthe calculation of reactor kinetic parameters: effective delayed neutron fraction beff and neutron generationtime L. The modified code, OpenMC(Time-Dependent) or OpenMC(TD), was then used tocalculate the effective delayed neutron fraction by using the prompt method, while the neutron generationtime was estimated using the pulsed method, fitting L to the decay of the neutron population. OpenMC(TD) is intended to serve as an alternative for the estimation of kinetic parameters whenlicensed codes are not available. The results obtained are compared to experimental data and MCNPcalculated values for 18 benchmark configurations.
Payri, Raul,Molina, S.,Salvador, F.J.,Gimeno, J. The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.7
This study examines the influence of geometry on the internal flow and macroscopic behavior of the spray in Diesel nozzles. For this investigation, two bi-orifice nozzles were employed: one cylindrical and one conical. The first step is to use a non-destructive characterization method which is based on the production of silicone moulds so that the precise internal geometry of the two nozzles can be measured. At this stage the nozzles have been characterized dimensionally and therefore the internal flow can be studied using CFD calculations. The results gained from this experiment make it possible also to ascertain the critical cavitation conditions. Once the critical cavitation conditions have been identified, the macroscopic parameters of the spray can be studied in both cavitating and non-cavitating conditions using a test rig pressurized with nitrogen and with the help of a image acquisition system and image processing software. Consequently, research can be carried out to determine the influence that cavitation has on macroscopic spray behavior. From the point of view of the spray macroscopic behavior, the main conclusion of the paper is that cavitation leads to an increment of the spray cone angle. On the other hand, from the point of view of the internal flow, the hole outlet velocity increases when cavitation appears. This phenomenon can be explained by the reduction in the cross section of the liquid phase in the outlet section of the hole.
Camila V. Molina,Juliana G. Lima,Izabel C. F. Moraes,Samantha C. Pinho 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.1
Beta-carotene is an extremely interesting bioactivecompound in the food industry due to its antioxidantcapacity and pro-vitamin A activity. However, its incorporationinto food products can be challenging, as it ishighly hydrophobic and chemically unstable. The aim ofthis study was to evaluate the feasibility of incorporatingbeta-carotene-loaded solid lipid microparticles (SLMs)stabilized with a hydrolyzed soy protein isolate in yogurt. The SLMs were produced using palm stearin as the lipidphase. Microparticle dispersions containing only beta-caroteneand both beta-carotene and alpha-tocopherol wereincorporated into yogurts, comprising 5% of its total mass. This addition itself was efficient to provide color, and thepresence of the lipid microparticles did not change thephysicochemical or the rheological characteristics of theproduct. Based on the sensory evaluation, the panelistsapproved the yogurt, as average grades of global acceptancewere around 8.0 (‘‘liked it very much’’) on thehedonic scale.
Ian Alfaro,Lorena Molina,Pablo Gonzalez,Jose Gaete,Fernando Valenzuela,Jose F. Marco,Cesar Saez,Carlos Basualto 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
The aim of this work is to produce a superparamagnetic core-shell adsorbent material composed ofmagnetite nanoparticles coated with a silica layer and functionalized with betaine for applicationsassociated with the recovery of molybdenum and rhenium anions from highly acidic aqueous solutions. The resulting nanoparticles with a quaternary amine surface were predominantly spherical with averagediameters of 14.3 1.7 nm. Adsorption experiments at pH values of 1-2 confirmed that it was possible touptake molybdate and perrhenate species using this adsorbent nanomaterial, achieving maximumloading capacities of 15 mg/gMNP for Mo and 19 mg/gMNP for Re.
Raul Payri,S. Molina,F. J. Salvador,J. Gimeno 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.7
This study examines the influence of geometry on the internal flow and macroscopic behavior of the spray in Diesel nozzles. For this investigation, two bi-orifice nozzles were employed: one cylindrical and one conical. The first step is to use a non-destructive characterization method which is based on the production of silicone moulds so that the precise internal geometry of the two nozzles can be measured. At this stage the nozzles have been characterized dimensionally and therefore the internal flow can be studied using CFD calculations. The results gained from this experiment make it possible also to ascertain the critical cavitation conditions. Once the critical cavitation conditions have been identified, the macroscopic parameters of the spray can be studied in both cavitating and non-cavitating conditions using a test rig pressurized with nitrogen and with the help of a image acquisition system and image processing software. Consequently, research can be carried out to determine the influence that cavitation has on macroscopic spray behavior. From the point of view of the spray macroscopic behavior, the main conclusion of the paper is that cavitation leads to an increment of the 'spray cone angle. On the other hand, from the point of view of the internal flow, the hole outlet velocity increases when cavitation appears. This phenomenon can be explained by the reduction in the cross section of the liquid phase in the outlet section of the hole.
A. Algora,D. Jordan,J. L. Tain,B. Rubio,J. Agramunt,L. Caballero,E. Nacher,A. B. Perez-Cerdan,F. Molina,A. Krasznahorkay,M. D. Hunyadi,J. Gulyas,A. Vitez,M. Csatlos,L. Csige,J. Aysto,H. Penttila,S. Ri 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The decay heat of fission products plays an important role in predictions of the heat released by nuclear fuel in reactors. In this contribution we present results of the analysis of the measurement of the beta decay of some refractory isotopes that were considered possible important contributors to the decay heat in reactors. The measurements presented here were performed at the IGISOL facility of the University of Jyvakyla Finland. In our measurements we have combined for the first time a Penning trap (JYFLTRAP), which was used as a high resolution isobaric separator, with a total absorption spectrometer. The results of the measurements as well as their consequences for decay heat summation calculations are discussed.