Intermultiplet transitions and magnetic long-range order in Sm-based pyrochlores

We present bulk and neutron scattering measurements performed on the isotopically enriched $^{154}\mathrm{Sm_2Ti_2O_7}$ and $^{154}\mathrm{Sm_2Sn_2O_7}$ samples. Both compounds display sharp heat capacity anomalies, at 350 mK and 440 mK, respectively. Inelastic neutron scattering measurements are employed to determine the crystalline electric field (CEF) level scheme, which includes transitions between the ground-state and first excited $J$ multiplets of the $\mathrm{Sm}^{3+}$ ion. To further validate those results, the single-ion magnetic susceptibility of the compounds is calculated and compared with the experimental DC-susceptibility measured in low applied magnetic fields. It is demonstrated that the inclusion of intermultiplet transitions in the CEF analysis is fundamental to the understanding of the intermediate and, more importantly, low temperature magnetic behaviour of the Sm-based pyrochlores. Finally, the heat capacity anomaly is shown to correspond to the onset of an all-in-all-out long-range order in the stannate sample, while in the titanate a dipolar long-range order can be only indirectly inferred.Comment: 13 pages, 10 Figure

Magnetic Excitations in the Ground State of Yb2Ti2O7\mathrm{Yb_2Ti_2O_7}

We report an extensive study on the zero field ground state of a powder sample of the pyrochlore $\mathrm{Yb_2Ti_2O_7}$. A sharp heat capacity anomaly that labels a low temperature phase transition in this material is observed at 280 mK. Neutron diffraction shows that a \emph{quasi-collinear} ferromagnetic order develops below $T_\mathrm{c}$ with a magnetic moment of $0.87(2)\mu_\mathrm{B}$. High resolution inelastic neutron scattering measurements show, below the phase transition temperature, sharp gapped low-lying magnetic excitations coexisting with a remnant quasielastic contribution likely associated with persistent spin fluctuations. Moreover, a broad inelastic continuum of excitations at $\sim0.6$ meV is observed from the lowest measured temperature up to at least 2.5 K. At 10 K, the continuum has vanished and a broad quasielastic conventional paramagnetic scattering takes place at the observed energy range. Finally, we show that the exchange parameters obtained within the framework of linear spin-wave theory do not accurately describe the observed zero field inelastic neutron scattering data.Comment: 11 pages, 9 figures, Phys. Rev. B. (accepted

The effects of COVID-19 on the mental health of the Peruvian police and armed forces

Accepted: 23 Feb. 2021 The COVID-19 pandemic has had a profound impact on the mental health of the general population. However, little attention has been given to the mental health of a group considered an essential category, police officers and the members of the armed forces. This study examined the mental health of 204 members of the armed forces and the police department assigned to monitor the public roads to enforce the measures adopted by the Peruvian government. The instruments used in the study included the Fear of COVID-19 Scale (FCV-19S), and the Revised Mental Health Inventory-5. The results indicate that (during the last month), the majority of the participants felt nervous and edgy (81.8%), and hopeless or sad (68.2%). According to the participants, the feelings of hopelessness and discouragement were significantly affecting their ability to rebound (84.3%). Participants had mixed feelings in regards of the fear generated by COVID-19, 42.6% reported extreme anxiety or panic, 40.6% were uncomfortable to think about COVID-19, and 42.6% were afraid of losing their lives due to the illness. The fear of COVID-19 predicted 19.7% (Adjusted R2 = 0.197; F = 21.32; p = .000) of the participants’ mental health well-being. In summary, the results suggest the presence of important psychological stressors related to COVID-19 that could potentially led to the development of mental health disorders among the Peruvian police and armed forces

Seismology Of A Massive Pulsating Hydrogen Atmosphere White Dwarf

We report our observations of the new pulsating hydrogen atmosphere white dwarf SDSS J132350.28+010304.22. We discovered periodic photometric variations in frequency and amplitude that are commensurate with nonradial g-mode pulsations in ZZ Ceti stars. This, along with estimates for the star's temperature and gravity, establishes it as a massive ZZ Ceti star. We used time-series photometric observations with the 4.1 m SOAR Telescope, complemented by contemporary McDonald Observatory 2.1 m data, to discover the photometric variability. The light curve of SDSS J132350.28+010304.22 shows at least nine detectable frequencies. We used these frequencies to make an asteroseismic determination of the total mass and effective temperature of the star: M-star = 0.88 +/- 0.02 M-circle dot and T-eff = 12,100 +/- 140 K. These values are consistent with those derived from the the optical spectra and photometric colors.CNPqFAPERGS/PronexUS National Science Foundation AST-0909107Norman Hackerman Advanced Research Program 003658-0252-2009MICINN grant AYA08-1839/ESPESF EUROCORES Program EuroGENESIS (MICINN grant) EUI2009-04170Generalitat de Catalunya 2009SGR315EU-FEDER fundsAGENCIA through the Programa de Modernizacion Tecnologica BID 1728/OC-ARCONICET PIP 112-200801-00940Astronom

COVID-19 in the South African Medical Journal

The novel virus causing COVID-19 disease, SARS-CoV-2, hashad a considerable impact on all major aspects of human life. Thepandemic has mobilised the global scientific community to respondto these unprecedented medical and non-medical consequences. Inview of the implications of coronavirus disease in global societies,professionals and experts have been working around the clock toproduce specialised evidence-based knowledge.Fil: Gallegos de San Vicente, Miguel Omar. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Católica de Maule; Chile. Pontifícia Universidade Católica de Minas Gerais; Brasil. Universidad Nacional de Rosario; ArgentinaFil: De Castro Pecanha, Viviane. The Chicago School Of Professional Psychology; Estados UnidosFil: Caycho Rodríguez, Tomas. Universidad Privada del Norte; PerúFil: Cervigni, Mauricio Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Rosario; ArgentinaFil: Martino, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Rosario; ArgentinaFil: Razumovskiy, Anastasia. Arizona College Of Nursing; Estados UnidosFil: Barboza Palomino, Miguel. Universidad Privada del Norte; Per

COVID-19 in Latin America: A Bibliometric Analysis of Scientific Publications in Health

The coronavirus disease (COVID-19) has become a global health crisis. The scientific community has responded with a sizable level of research and publications, many of which are beginning to be identified and analyzed in systematic reviews of the literature and bibliometric studies. No readily identifiable, comparable study focused on Latin American scientific literature has been undertaken thus far. Therefore, this article analyzes such literature, focused on COVID-19, and one that has been published in the scientific journals of the region. A search with the keyword “COVID-19” in the Scientific Electronic Library Online (SciELO) database resulted in the identification of 261 documents. Following PRISMA guidelines, the total number was reduced to 117 for the purpose of the bibliometric analysis (i.e., elimination of preprint duplicates). Such analysis resulted in the following findings: 69 publications were editorial or individual commentaries, and 48 were original articles. The male authors totaled 280, contrasted with 169 female authors. Two Brazilian journals led in the number of publications: Cadernos de Saúde Pública and Clinics. Even though the Latin American scientific productivity regarding COVID-19 is not well represented in the different databases of the region, it is expected that these scientific publications will achieve increased visibility in the coming months. The article emphasizes the importance of systematic and bibliographic reviews ofthe scientific literature in Latin America in orderto evaluate the public health achievements of the region.Fil: Gallegos de San Vicente, Miguel Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto Rosario de Investigaciones en Ciencias de la Educación. Universidad Nacional de Rosario. Instituto Rosario de Investigaciones en Ciencias de la Educación; Argentina. Universidad Catolica de Maule; ChileFil: Cervigni, Mauricio Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto Rosario de Investigaciones en Ciencias de la Educación. Universidad Nacional de Rosario. Instituto Rosario de Investigaciones en Ciencias de la Educación; ArgentinaFil: Consoli, Andrés J.. University of California; Estados UnidosFil: Caicho Rodriguez, Tomás. Pontificia Universidad Católica de Perú; PerúFil: Polanco, Fernando Andrés. Universidad Nacional de San Luis. Facultad de Psicología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Martino, Pablo Luis. Universidad Nacional de Rosario. Facultad de Psicología. Secretaria de Ciencia y Tecnología. Centro de Investigación En Neurociencias de Rosario; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Castro Pecanha, Viviane. University of Chicago; Estados UnidosFil: Buergos Videla, Carmen. Universidad de Atacama.; ChileFil: Polanco Carrasco, Roberto. No especifíca;Fil: Cussinato, Adriana Marie. Universidad de Palermo; Argentina. Universidad Nacional de Rosario; Argentin

Triagem fitoquímica e doseamento de polifenóis totais e flavonóides em diferentes amostras de espinheira santa (Maytenus ilicifolia Mart.) / Phytochemical screening and assay of total polyphenols and flavonoids in different samples of holy thorn (Maytenus ilicifolia Mart.)

O objetivo deste estudo foi realizar triagem fitoquímica qualitativa em extratos de três diferentes amostras de espinheira santa (Maytenus ilicifolia Mart.) comercializadas no município de Bagé/RS, assim como avaliar o teor de polifenóis totais e flavonóides por espectofotometria. A análise fitoquímica foi realizada em triplicata através de reações clássicas de caracterização por meio de reações de precipitação, coloração e formação de espuma. Os resultados das análises fitoquímicas foram semelhantes para cada grupo de metabólito secundário, admitindo assim um padrão de qualidade entre as amostras avaliadas. Nos testes quantitativos, a Amostra C evidenciou a maior média, tanto para polifienóis totais (x=119,334; DP= 1,88) quanto para flavonóides (x=395,878; DP=1,355), inclusive com diferença significativa neste último quando comparada às demais amostras avaliadas. Haja vista a ampla difusão do consumo de produtos naturais no Brasil, incluindo os de ação farmacológica comprovada através de estudos científicos, verifica-se a necessidade de intensificar o processo de controle de qualidade dos mesmos, considerando as distintas variações no processo de cultivo, produção e comercialização aos que os mesmos estão sujeitos. Os achados desse estudo inferem uma lacuna no controle de qualidade de produtos naturais comercializados em estabelecimentos de saúde

Contribuciones intelectuales y sociales de las mujeres en la revista puertorriqueña de psicología: Un estudio de método mixto

A finales de la década de los ochenta se comenzaron a estudiar algunas características de las publicaciones en psicología acerca de la presencia disímil de género, raza y otras minorías, mostrando que muchas autorías y participantes de los estudios eran de raza blanca, de clase media y hombres. Por esto, consideramos relevante investigar la posición que ocupó la mujer en la historia de la Revista Puertorriqueña de Psicología. Para ello realizamos un estudio mixto de base sociobibliométrica de la producción escrita de la revista. Analizamos y procesamos los datos en programas informáticos especializados en el ámbito de la bibliometría, el análisis de redes sociales y conceptuales. En los resultados se visibilizó el lugar de preponderancia y liderazgo que ocuparon las mujeres como productoras de textos y de redes de colaboración. Observamos en las principales temáticas de los textos una incipiente orientación a temas de género, que se consolidó con el transcurrir de los volúmenes, con temáticas que incluyeron a las mujeres y la diversidad sexual.At the end of the 1980s, researchers began examining gender, race, and minority group disparities in authorship and publications since findings informed that the majority of authors and study participants were white middle-class men. Based on this data, we decided to analyze trends in women’s representation as authors throughout the history of the Puerto Rican Journal of Psychology “Revista Puertorriqueña de Psicología.” For this purpose, we carried out a mixed method sociobibliometric study focused on the articles published in the journal. The data was collected, processed, and analyzed using specialized software in the field of bibliometrics, social and conceptual network analysis. The results made visible the place of preponderance and leadership occupied by women as producers of texts and collaborative networks. We observed in the main themes of the texts an incipient orientation to gender issues, which was consolidated as the volumes passed, with themes that included women and sexual diversity.Fil: Polanco, Fernando Andrés. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; ArgentinaFil: Béria, Josiane Sueli. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; ArgentinaFil: de Castro Pecanha, Viviane. The Chicago School Of Professional Psychology; Estados UnidosFil: Gallegos de San Vicente, Miguel Omar. Pontificia Universidade Catolica de Minas Gerais.; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto Rosario de Investigaciones en Ciencias de la Educación. Universidad Nacional de Rosario. Instituto Rosario de Investigaciones en Ciencias de la Educación; ArgentinaFil: Lopes Miranda, Rodrigo. Universidade Católica Dom Bosco; BrasilFil: de Souza Santos, Guilherme. Universidade Católica Dom Bosco; BrasilFil: Cudina, Jean Nikola. Fundación Universitaria Católica Lumen Gentium; ColombiaFil: Ossa, Julio César. Fundación Universitaria de Popayán; Colombi

Problem and Pathological Gambling in a Sample of Casino Patrons

Relatively few studies have examined gambling problems among individuals in a casino setting. The current study sought to examine the prevalence of gambling problems among a sample of casino patrons and examine alcohol and tobacco use, health status, and quality of life by gambling problem status. To these ends, 176 casino patrons were recruited by going to a Southern California casino and requesting that they complete an anonymous survey. Results indicated the following lifetime rates for at-risk, problem, and pathological gambling: 29.2, 10.7, and 29.8%. Differences were found with regards to gambling behavior, and results indicated higher rates of smoking among individuals with gambling problems, but not higher rates of alcohol use. Self-rated quality of life was lower among pathological gamblers relative to non-problem gamblers, but did not differ from at-risk or problem gamblers. Although subject to some limitations, our data support the notion of higher frequency of gambling problems among casino patrons and may suggest the need for increased interventions for gambling problems on-site at casinos