66 research outputs found
The electronics and trigger system of the High Energy Particle Detector (HEPD) onboard the China Electromagnetic Satellite (CSES)
No full textIn this paper a description of the electronics and trigger system of the High Energy Particle Detector (HEPD) onboard the China Seismo Electromagnetic Satellite (CSES) and its main characteristics will be presented. CSES is a scientific mission dedicated to monitoring electromagnetic, plasma and particles perturbations of atmosphere and inner Van Allen belts caused by solar and terrestrial phenomena and to the study of the low energy component of the cosmic rays (5 - 100 MeV for electrons and 15 - 300 MeV for protons). The satellite will be launched in 2017 and will host several instruments onboard: two magnetometers, an electrical field detector, a plasma analyser, a Langmuir probe and the HEPD. The HEPD, built by the Italian "Limadou" collaboration, is capable of separating electrons and protons and identify nuclei up to Iron. The HEPD comprises the following subsystems: detector, electronics, power supply and mechanics. The electronics, main focus of this paper, can be divided into three blocks: silicon detector, scintil-lator detectors (trigger, energy and veto detectors) and global control and data managing. The trigger system allows switching between several configurations along the orbit to cope with different fluxes encountered. Each trigger configuration corresponds to different field of view of the apparatus. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0)
The hepd apparatus for the cses mission
No full textThe CSES (China Seismo-Electromagnetic Satellite) mission will investigate the structure and the dynamic of the topside ionosphere, will monitor electric and magnetic field and high energy particle fluctuations, searching for their correlations with the geophysical activity, in order to contribute to the monitoring of earthquakes from space. The High-Energy Particle Detector (HEPD) is one of the payloads of the CSES space mission, built by the Italian Limadou collaboration. Results of the test beams held at the Beam Test Facility of the INFN National Laboratory of Frascati, for electrons, and at the Proton Cyclotron of Trento, for protons, will be presented. © Copyright owned by the author(s)
Effective Approaches of Improving the Performance of Chalcogenide Solid Electrolytes for All-Solid-State Sodium-Ion Batteries
No full textAll-solid-state sodium-ion batteries (SIBs) possess the advantages of rich resources, low price, and high security, which are one of the best alternatives for large-scale energy storage systems in the future. Also, the chalcogenide solid electrolytes (CSEs) of SIBs have the characteristics of excellent room-temperature ionic conductivity (10−3-10−2 S cm−1), low activation energy (<0.6 eV), easy cold-pressing consolidation, etc. Hence, CSEs have become a very active area of all-solid-state SIB research in recent years. In this review, the modification methods and implementation technologies of CSEs are summarized, and the structure and electrochemical performance of the CSEs are discussed. Furthermore, the auxiliary function of first-principle calculations for modification is introduced. Ultimately, we describe the challenges regarding CSEs and propose some strategic suggestions.Electronic Components, Technology and Material
Reconstructing the phytoplankton community of the Cariaco Basin during the Younger Dryas cold event using chlorin steryl esters
No full textAuthor Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 19 (2004): PA01006, doi:10.1029/2003PA000907.A record of the downcore distribution of chlorin steryl esters (CSEs) through the Younger Dryas was produced from Cariaco Basin sediments in order to assess the potential use of CSEs as recorders of the structure of phytoplankton communities through time. Using an improved high-performance liquid chromatography method for the separation of CSEs, we find significant changes in the distribution of CSEs during the Younger Dryas in the Cariaco Basin. During the Younger Dryas, enhanced upwelling in the Cariaco Basin caused an increase in the diatom population and therefore an increase in the relative abundance of CSEs derived from diatoms. In contrast, the dinoflagellate population, and therefore CSEs derived from dinoflagellates, decreased in response to the climate change during the Younger Dryas. These community shifts agree well with the shifts observed in the present day on a seasonal basis that result from the north-south migration of the Intertropical Convergence Zone over the Cariaco Basin. We also identify changes in the abundance of several CSEs that seem to reflect rapid warming and cooling events. This study suggests that CSEs are useful proxies for reconstructing phytoplankton communities and paleoenvironments.This work was supported by the Chemical
Oceanography Division of the National Science Foundation and a WHOI
Watson Fellowship (to KAD)
Professionalism in Crime Scene Examination: Recruitment Strategies, Part 2: Using a Psychometric Profile of Top Crime Scene Examiners in Selection Decision Making
No full textRecruiting high-caliber personnel is crucial in law enforcement and in the forensic sciences. Selecting personnel with the potential to excel in crime scene work is no exception. This is the third paper in a series on professionalism in crime scene examiners (CSEs). The first paper identified the seven key attributes that set top-performing CSEs apart from their lesser performing peers. The second paper presented an overview of a recruitment strategy for selecting applicants with the potential to become top-performing CSEs. In the second paper the author discussed the use of psychometric testing as a resource to aid decision making in hiring well. The aim of this paper is to expand that discussion of how psychometric testing can be used appropriately in forensic recruitment decision making. This paper will provide forensic managers with a valid psychometric profile of top-performing CSEs along with guidelines for how to use this profile correctly within a targeted and focused five-stage recruitment proces
Professionalism in crime scene examination: recruitment strategies, part 2: using a psychometric profile of top crime scene examiners in selection decision making
No full textRecruiting high-caliber personnel is crucial in law enforcement and in the forensic sciences. Selecting personnel with the potential to excel in crime scene work is no exception. This is the third paper in a series on professionalism in crime scene examiners (CSEs). The first paper identified the seven key attributes that set top-performing CSEs apart from their lesser performing peers. The second paper presented an overview of a recruitment strategy for selecting applicants with the potential to become topperforming CSEs. In the second paper the author discussed the use of psychometric testing as a resource to aid decision making in hiring well. The aim of this paper is to expand that discussion of how psychometric testing can be used appropriately in forensic recruitment decision making. This paper will provide forensic managers with a valid psychometric profile of top-performing CSEs along with guidelines for how to use this profile correctly within a targeted and focused five-stage recruitment process
Vocational Identity Achievement as a Mediator of Presence of Calling and Life Satisfaction
No full textThe present study explores what mechanism might be responsible for the reported link between presence of a calling in one's career and life satisfaction. It is proposed that vocational identity achievement acts as one important mediator of this relation and that the effects can be observed even when controlling for core self-evaluations (CSEs). The study used a short-term longitudinal design based on a sample of 269 German college students from different majors. The results confirmed the mediation model, with calling predicting vocational identity achievement 6 months later and identity serving as a stronger predictor of life satisfaction, all controlling for CSEs. However, contrary to previous research, presence of calling was not directly related to life satisfaction and even showed a negative relation when vocational identity achievement was controlled. The results are interpreted to suggest a multifaceted relation between calling and life satisfaction. © The Author(s) 2012
Peer-assisted feedback: a successful approach for providing feedback on United States Medical Licensing Exam-style clinical skills exam notes in the United States
No full textThe University of Florida College of Medicine administers clinical skills examination (CSEs) that include USMLE-like note-writing. Peer-assisted learning (PAL), in which students support the learning of their peers, was utilized as an alternative to faculty feedback. Second-year (MS2) and third-year (MS3) medical students taking CSEs participated in faculty-run note-grading sessions immediately after testing, which included explanations of grading rubrics and the feedback process. Students graded an anonymized peer’s notes. The graded material was then forwarded anonymously to its student author to review. Students were surveyed on their perceived ability to provide feedback and the benefits derived from PAF using a Likert scale (1–6) and open-ended comments during the 2017–2018 academic year
Peer-assisted feedback: a successful approach for providing feedback on United States Medical Licensing Exam-style clinical skills exam notes in the United States
No full textThe University of Florida College of Medicine administers clinical skills examination (CSEs) that include USMLE-like note-writing. Peer-assisted learning (PAL), in which students support the learning of their peers, was utilized as an alternative to faculty feedback. Second-year (MS2) and third-year (MS3) medical students taking CSEs participated in faculty-run note-grading sessions immediately after testing, which included explanations of grading rubrics and the feedback process. Students graded an anonymized peer’s notes. The graded material was then forwarded anonymously to its student author to review. Students were surveyed on their perceived ability to provide feedback and the benefits derived from PAF using a Likert scale (1–6) and open-ended comments during the 2017–2018 academic year
The role of social contexts in associations between early-life circumstances and cognitive aging: a work towards aging equity
No full textBackground: Alzheimer’s disease and related dementias (ADRD) are a public health priority in the United States due to the biopsychosocial ramifications of these disorders for individuals, families, and society. Facilitating and maintaining higher levels of cognitive performance throughout the life course may partially prevent ADRD. While most prevention efforts have historically focused on modifiable risk factors in middle and later life, scholars are increasingly identifying the early-life contextual factors that influence cognitive performance throughout adulthood. Largely absent from this literature are considerations of whether fundamental social contexts, such as racism and economic disadvantage, underlie these associations. This dissertation addresses this gap through three papers:
Paper 1: Early life adversity (ELA) refers to childhood experiences that would theoretically over-activate a stress response or overwhelm coping capacities. While research in human and animal models indicate that dysregulation of the stress response can influence brain structure and architecture, there has been mixed evidence that supports that early-life adversity (ELA) is associated with later life cognition. Specifically, some research studies suggest that neglect, abuse, maternal death, and cumulative exposure to ELA, among others, are associated with later life cognition, but these associations are not always replicated across studies. Comparatively understudied are considerations of whether the association between ELA and later life cognition is influenced by socioeconomic disadvantage and racism. Paper 1 addresses this gap by ascertaining if childhood socioeconomic status (cSES) and race jointly moderate associations between ELA and cognition using data from adults ages 51 and older in the Health and Retirement (HRS) study.
Paper 2: While there is evidence of the protective role of higher cSES on cognition, the theory of Minority Diminished Returns (MDR) suggests that this protective effect may be diminished among Black individuals. Using data from the National Longitudinal Study of Adolescent to Adult Health (Add Health), I evaluate if associations between cSES and cognition are jointly moderated by race and region of childhood residence among a cohort of adults ages 25-34.
Paper 3: While studies suggest that higher parental education, and more broadly cSES, is associated with higher cognitive performance in later life, few studies have explored if this protective effect is diminished among Black individuals. Using data from the HRS, the Midlife in the United States (MIDUS) Study, and the National Social Life, Health and Aging Project (NSHAP), I test if the protective effect of higher parental education is diminished among Black participants ages 50 and over, relative to their White counterparts.
Results: In paper 1, I found that among White participants, greater exposure to ELA was associated with poorer later life cognition at baseline, but not rate of change over time, and higher cSES buffered this association; in comparison, among Black participants, ELA exposure was not associated with later life cognition at baseline or over time, regardless of level of cSES. In paper 2, I found evidence that race and region of childhood residence jointly moderated associations between cSES and working memory, but not delayed recall, among a sample of young adults. Specifically, I found that the protective effects of higher cSES was salient among White participants and Black participants from outside the South, but not for Black participants from the South. Finally, in paper 3, I found evidence that, among pooled samples across three population health studies, the protective effect of higher parental education was diminished among Black participants in terms of episodic memory and global cognition.
Conclusions: Early life contextual factors and their associations with cognition throughout the life course do not always operate the same across populations. Specifically, targeting ELA, cSES, and parental education as population health measures to promote later life cognitive performance may not be universal across populations, but, rather, are conditional on social positions and their intersections. Collectively, these papers provide a foundational body of evidence that suggests that early-life risk and protection for cognitive aging should be considered in conjunction with intersecting social positions. These papers provide additional evidence of the need to address anti-Black racism to facilitate healthier cognitive aging across the life course.Ph.D.Includes bibliographical reference
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