1,355,557 research outputs found
Graphene derived lanthanum carbide targets for the SPES ISOL facility
No full textGraphene derived lanthanum carbide targets for the SPES ISOL facility By:Corradetti, S (Corradetti, S.)[ 1 ] ; Carturan, SM (Carturan, S. M.)[ 1,2 ] ; Andrighetto, A (Andrighetto, A.)[ 1 ] ; Mariotto, G (Mariotto, G.)[ 3 ] ; Giarola, M (Giarola, M.)[ 3 ] ; Fabrizi, A (Fabrizi, A.)[ 4 ] ; Maddalena, A (Maddalena, A.)[ 5 ] ; Biasetto, L (Biasetto, L.)[ 1,4 ] CERAMICS INTERNATIONAL Volume: 43 Issue: 14 Pages: 10824-10831 DOI: 10.1016/j.ceramint.2017.05.106 Published: OCT 1 2017 View Journal Impact Abstract Lanthanum carbide based targets were produced as benchmark tests before the production of radioactive uranium carbide targets. Carbides possessing excess carbon and porosity seem to be the best candidates as target for the production of exotic beams in the SPES-ISOL facility. In addition, the capability of tailoring properties such as grains size and pores size represents a step ahead to improve the ions release efficiency. In this work, multilayered graphene was used as source of carbon for the production of LaC and the main physical properties of the produced targets were compared to standard LaCx produced using micrometric graphite. The main output of the work consisted in the reduced total porosity (28.8 vol% vs 47.8 vol%) and increased shrinkage (20.4 vol% vs 5.8 vol%) of the LaCx-Graphene samples compared to LaCx-Graphite ones. This result showed how graphene can be successfully employed as sintering aid for the sintering of carbides. Further studies are ongoing with UO2 as starting reagent for carburization within the project AUL-2013-16-176 "Study of the use of graphene as source of carbon for Uranium Carbide-Graphene nanocomposites production" now under conclusion at the European Commission DG Joint Research Centre - JRC
Grand Theft Auto is a “Sandbox” Game, but There are Weapons, Criminals, and Prostitutes in the Sandbox: Response to Ferguson and Donnellan (2017)
No full textIn this issue, (Ferguson, C. J., & Donnellan, B. D., Journal of Youth and and Adolescence, published online 21 June 2017) criticize one of our studies (Gabbiadini, A., Riva, P., Andrighetto, L., Volpato, C., & Bushman, B. J., PLoS ONE, 11: 1-14, 2016) that found violent sexist video games can reduce empathy for female violence victims in male players who identify with violent male game characters, and do so by increasing masculine beliefs. Their main criticism is a "straw person" argument built on a claim that we never made (i.e., a direct effect of sexist-violent video games on empathy). They also made several other criticisms of our article. We appreciate the opportunity to respond to their criticisms in this article. We also point out some flaws in their reanalysis. Despite their criticisms, the core contributions of our original article remain intact
Emissivity measurements of opaque gray bodies up to 2000 degrees C by a dual-frequency pyrometer
No full textIn the framework of the SPES project at LNL-INFN a method for emissivity measurements by a double-frequency pyrometer in the infrared region at high temperatures on opaque gray bodies of SiC and graphite is presented. The measurement method proposed in this work reveals a good fitting with literature values. Moreover, the effect of surface finishing on emissivity values has been investigated
Thermal-electric numerical simulation of a surface ion source for the production of radioactive ion beams
No full textIn afacilityfortheproductionofradioactiveionbeams(RIBs),thetargetsystemandtheionsourceare
the mostcriticalobjects.InthecontextoftheSelectiveProductionofExoticSpecies(SPES)project,a
protonbeamdirectlyimpingesaUraniumCarbideproductiontarget,generatingapproximately1013
fissionspersecond.Theradioactiveisotopesproducedbythe 238U fissionsarethendirectedtotheion
sourcetoacquireachargestate.Afterthat,theradioactiveionsobtainedaretransported
electrostaticallytothesubsequentareasofthefacility.Inthisworkthesurfaceionsourceatpresent
adoptedfortheSPESprojectisstudiedbymeansofbothanalyticalandnumericalthermal–electric
models.Thetheoreticalresultsarecomparedwithtemperatureandelectricpotentialdifference
measurements
Thermal-electric numerical simulation of a target for the production of radioactive ion beams
No full textThe production target is the core of the facilities aimed at the production of Radioactive Ion Beams. In
the facility analysed in this paper, a proton beam directly impinges a target made of uranium carbide
that generates the radioactive isotopes needed to produce Radioactive Ion Beams. To work properly, the
target has to maintain the average temperature of two thousands Celsius degrees, but the proton beam
power is not sufficient to maintain this temperature level; as a consequence an electric heating device
has to be added. In this work the production target and its heating system are analysed by means of
both analytic and numerical thermal–electric models. In particular, the numerical model was
implemented by means of a commercial finite element code and fully coupled thermal–electric
analyses were performed with a proper solution method for the radiative heat transfer problem.
Theoretical results have been compared with experimental data in terms of temperature and electric
potential difference, showing the substantial reliability of both the analytic and the numerical models.
Subsequent to the validation of the finite element model, a sensitivity analysis was performed to
investigate the influence of some design variables and construction details on the target temperature
distribution
Does status affect intergroup perceptions of humanity?
No full textAcross three studies, we examined whether ingroup status may affect intergroup perceptions of humanity. In Studies 1 and 2, we considered real groups: Northern versus Southern Italians; in Study 3, we manipulated the socioeconomic status of two minimal groups. In all studies, members of higher status groups perceived the ingroup as more human than the outgroup, while members of lower status groups did not assign a privileged human status to the ingroup. Such findings were obtained using different implicit techniques: the Implicit Association Test (IAT) and the Go/No-go Association Task (GNAT). Further, results suggest that the different perceptions of humanity may depend on the stereotypic traits generally ascribed to higher and lower status groups. The implications of results for infrahumanization research are discussed. © The Author(s) 2012
Effects of extruded corn on milk yield and composition and blood parameters in lactating dairy cows
No full textAccording to a 2x2 cross over design, fourteen Holstein dairy cows at 99±55 DIM were fed two diets containing 21.5% DM of either ground corn (GC) or extruded corn (EC). Performance and metabolic profile were detected during the third week of each experimental period. DMI and milk yield were not affected by dietary treatments. Milk fat and protein percentage of EC diet were significantly (P<0.10) lower than those of GC diet. Probably the higher rumen degradability of starch from EC thesis modified the synthesis of specific fatty acids leading to a milk fat depression event. Diets did not influence blood parameters, except for lower values of total protein and glucose content in EC diet-fed cows. Results suggested that the dietary inclusion of extruded corn should not be used at the tested level of substitution
Fission Fragment Production from Uranium Carbide Disc Targets
No full textA possible solution for a target system aimed at the production of exotic nuclei as a result of high-energy fissions in 238U compounds has been analyzed. The configuration proposed is constituted by a primary proton team (40 MeV, 0.4 mA) directly impinging on a UC2 multiple-disc target inserted within a cylindrical tungsten box. In order to extract the fission fragments, the tungsten box has to be kept at 2000°C. This system has been conceived to obtain both a high number of fission fragments (about 2 . 1013 atoms/s) and a quite low power deposition in the target. The power release and the fragment distribution have been calculated by means of the Monte Carlo code MCNPX. The thermal analysis of the proposed configuration shows the capability of the thermal radiation to cool the discs with a reasonable margin below the material melting point. Moreover, the possibility of increasing such margin with simple modifications of the target design is shown by means of parametric analyses. The thermal analysis of the tungsten box, also cooled by radiation, points out the necessity to heat it and/or shield it thermally, in order to take it at the requested temperature. Preliminary calculations of the target-induced activity have also been performed
The Deconstruction Enemy Images for a Nonkilling Society
No full textThis book demonstrates the rich diversity of research approaches developed so far within the field of psychology. In this collection of essays, one moves from biomedical aspects to moral dimensions, through various renditions of social psychology. The book is organized into three sections: (I) psychological causes and consequences of killing; (II) The prevention of killing: from interpersonal to international; and (III) personal transformation: from killing to nonkilling. What brings humans to kill each others or themselves? Is a nonkilling society possible? Answers have been attempted, unanswered questions have been raised, and unexplored issues wait for further investigation
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