Hispanic Students\u27 Perceptions of Success: A Phenomenological Study on the Impact on K-12 Academic Achievement

The purpose of this phenomenological study was to understand the impact of Hispanic learners’ perceptions of success on their completion of secondary/post-secondary studies. The following served as a guiding research question: How do the perceptions of success among male and female Hispanic high school completers/non-completers ages 18-29 impact their educational pursuits? This qualitative study examined the lived experiences of Hispanic participants through social/cultural contexts framed around Bronfenbrenner’s (1974) ecological systems theory, Vygotsky’s (1978) social learning theory, Rotter’s (1954) social learning, and Bandura’s (2002) social cognitive theory. Participants included 22 Hispanic high school completers/non-completers ages 18-29 who were clients or students in one of three settings: a Hispanic advocacy center, an adult education center, or a moderate-size university, all near Atlanta, Georgia. A phenomenological approach was chosen because phenomenology considers constructs through the consciousness of persons who live unique experiences. Following Moustakas’ (1994) methodology, this study sought to organize data in such a way to elicit textural and structural descriptions as well as structural meanings related to the phenomenon. Data was gathered through semi-structured interviews, focus groups, and observations. Analysis was conducted via coding, memoing, and bracketing. By examining participants’ perspectives, as well as their experiences in United States K-12 settings, the researcher determined that their definition of success centered on family. A future phenomenological study to examine language as an acculturative construct, as well as a case study to frame Hispanic students’ perspectives in educational and familial milieus were proposed

High-speed quantum networking by ship

Networked entanglement is an essential component for a plethora of quantum computation and communication protocols. Direct transmission of quantum signals over long distances is prevented by fibre attenuation and the no-cloning theorem, motivating the development of quantum repeaters, designed to purify entanglement, extending its range. Quantum repeaters have been demonstrated over short distances, but error-corrected, global repeater networks with high bandwidth require new technology. Here we show that error corrected quantum memories installed in cargo containers and carried by ship can provide a flexible connection between local networks, enabling low-latency, high-fidelity quantum communication across global distances at higher bandwidths than previously proposed. With demonstrations of technology with sufficient fidelity to enable topological error-correction, implementation of the quantum memories is within reach, and bandwidth increases with improvements in fabrication. Our approach to quantum networking avoids technological restrictions of repeater deployment, providing an alternate path to a worldwide Quantum Internet.Comment: 7 Pages, 2 Figures 1 Table. Comments Welcome. Final Version, to Appear Sci. Re

Bridging cultural heritage and communities through digital technologies: Understanding perspectives and challenges

We present and discuss the results of a qualitative study aimed at identifying what role interactive digital technologies could play in facilitating the participation of communities at risk of exclusion (particularly migrants and refugees) in cultural and heritage-related activities. Culture and heritage are known to be key factors in fostering social inclusion, and this has the potential for contributing to both the wellbeing of these communities and to cultural institutions themselves. Through surveys and interviews with two cohorts of participants (cultural heritage professionals and community facilitators), we gathered insights about their perspectives on how ICT tools could support their work with and for communities, as well as the challenges they face. This work sheds light on the opportunities and barriers surrounding the use of digital technologies for participation in the cultural heritage sector, which is timely due to the increasing focus on grassroots and community-led heritage initiatives and to the growing body of work on participatory ICT in disciplines such as human-computer interaction and community informatics

Comparison of measures of marker informativeness for ancestry and admixture mapping

<p>Abstract</p> <p>Background</p> <p>Admixture mapping is a powerful gene mapping approach for an admixed population formed from ancestral populations with different allele frequencies. The power of this method relies on the ability of ancestry informative markers (AIMs) to infer ancestry along the chromosomes of admixed individuals. In this study, more than one million SNPs from HapMap databases and simulated data have been interrogated in admixed populations using various measures of ancestry informativeness: Fisher Information Content (FIC), Shannon Information Content (SIC), F statistics (F_ST), Informativeness for Assignment Measure (I_n), and the Absolute Allele Frequency Differences (delta, δ). The objectives are to compare these measures of informativeness to select SNP markers for ancestry inference, and to determine the accuracy of AIM panels selected by each measure in estimating the contributions of the ancestors to the admixed population.</p> <p>Results</p> <p>F_STand I_nhad the highest Spearman correlation and the best agreement as measured by Kappa statistics based on deciles. Although the different measures of marker informativeness performed comparably well, analyses based on the top 1 to 10% ranked informative markers of simulated data showed that I_nwas better in estimating ancestry for an admixed population.</p> <p>Conclusions</p> <p>Although millions of SNPs have been identified, only a small subset needs to be genotyped in order to accurately predict ancestry with a minimal error rate in a cost-effective manner. In this article, we compared various methods for selecting ancestry informative SNPs using simulations as well as SNP genotype data from samples of admixed populations and showed that the I_nmeasure estimates ancestry proportion (in an admixed population) with lower bias and mean square error.</p

Y Chromosome Lineages in Men of West African Descent

The early African experience in the Americas is marked by the transatlantic slave trade from ∼1619 to 1850 and the rise of the plantation system. The origins of enslaved Africans were largely dependent on European preferences as well as the availability of potential laborers within Africa. Rice production was a key industry of many colonial South Carolina low country plantations. Accordingly, rice plantations owners within South Carolina often requested enslaved Africans from the so-called “Grain Coast” of western Africa (Senegal to Sierra Leone). Studies on the African origins of the enslaved within other regions of the Americas have been limited. To address the issue of origins of people of African descent within the Americas and understand more about the genetic heterogeneity present within Africa and the African Diaspora, we typed Y chromosome specific markers in 1,319 men consisting of 508 west and central Africans (from 12 populations), 188 Caribbeans (from 2 islands), 532 African Americans (AAs from Washington, DC and Columbia, SC), and 91 European Americans. Principal component and admixture analyses provide support for significant Grain Coast ancestry among African American men in South Carolina. AA men from DC and the Caribbean showed a closer affinity to populations from the Bight of Biafra. Furthermore, 30–40% of the paternal lineages in African descent populations in the Americas are of European ancestry. Diverse west African ancestries and sex-biased gene flow from EAs has contributed greatly to the genetic heterogeneity of African populations throughout the Americas and has significant implications for gene mapping efforts in these populations

Dissecting the Shared Genetic Architecture of Suicide Attempt, Psychiatric Disorders, and Known Risk Factors

Background Suicide is a leading cause of death worldwide, and nonfatal suicide attempts, which occur far more frequently, are a major source of disability and social and economic burden. Both have substantial genetic etiology, which is partially shared and partially distinct from that of related psychiatric disorders. Methods We conducted a genome-wide association study (GWAS) of 29,782 suicide attempt (SA) cases and 519,961 controls in the International Suicide Genetics Consortium (ISGC). The GWAS of SA was conditioned on psychiatric disorders using GWAS summary statistics via multitrait-based conditional and joint analysis, to remove genetic effects on SA mediated by psychiatric disorders. We investigated the shared and divergent genetic architectures of SA, psychiatric disorders, and other known risk factors. Results Two loci reached genome-wide significance for SA: the major histocompatibility complex and an intergenic locus on chromosome 7, the latter of which remained associated with SA after conditioning on psychiatric disorders and replicated in an independent cohort from the Million Veteran Program. This locus has been implicated in risk-taking behavior, smoking, and insomnia. SA showed strong genetic correlation with psychiatric disorders, particularly major depression, and also with smoking, pain, risk-taking behavior, sleep disturbances, lower educational attainment, reproductive traits, lower socioeconomic status, and poorer general health. After conditioning on psychiatric disorders, the genetic correlations between SA and psychiatric disorders decreased, whereas those with nonpsychiatric traits remained largely unchanged. Conclusions Our results identify a risk locus that contributes more strongly to SA than other phenotypes and suggest a shared underlying biology between SA and known risk factors that is not mediated by psychiatric disorders.Peer reviewe