1,775 research outputs found
Pilot Study of the Effects of Tai Chi on Elderly Fall Risks
No full textIntroduction. Falls in the elderly are a significant public health concern. Tai Chi has been shown to reduce falls in this population and increase muscle strength, balance, mood, confidence and sleep.Presented at the American Public Health Association 141st Annual Meeting & Exposition, Boston, MA, November 3, 2013 as "Pilot study of the effects of tai chi on elderly fall risks," Amanda Dauten, Kara Klingman, Kyung Jun Min, Emily Schloff, Vishal Shah, MS, Corey Sheahan, Sarah Vossoughi, Kathleen Hall, PhD, Devida Deluca, Philip Trabulsy, MD and Jan K. Carney, MD MPH
Older and Happier? Associations Among Age, Affective Symptomatology, and Quality of Life in Persons With Multiple Sclerosis
No full textAbstract
Date Presented 3/31/2017
This study identifies a relationship between age and quality of life in persons with multiple sclerosis. It highlights the role of promoting coping in younger adults to prevent or decrease symptoms of depression or anxiety as a means of increasing quality of life.
Primary Author and Speaker: Brocha Stern
Contributing Authors: John DeLuca, Yael Goverover</jats:p
Shoreline evolution related to coastal development of a managed beach in Alghero, Sardinia, Italy
No full textThis work investigates the shoreline changes affecting the beaches between the resort towns of Alghero and Fertilia, on the northwest coast of Sardinia, Italy, following recent planned expansion and dredging of the main harbours. A thirty-year historical shoreline time-series and sediment grain-size changes along the beach are analysed, in order to obtain recent evidence of erosional/accretional trends. Shoreline position change rates are quantified and discussed in relation to the history of coastal development and to Posidonia oceanica seagrass litter management. This study shows that, as a whole, the sediment budget of the beach is maintained, and the total area of shoreline accretion is slightly larger than the area of retreat. However over 60% of the total 4670m of shoreline is retreating, mainly in the most valuable sectors of the littoral for stakeholders. The shoreline in the areas closest to the two harbour breakwaters, which were extended during the 1980s, is advancing at a rate of up to 2.8myr-1. Areas closer to the seawall of Punta del Paru are retreating, at a rate of up to 1myr-1, and the nearby dune fields are eroding. The natural dunes at Maria Pia beach are acting as a source of sand to the littoral. The use of beach-cast seagrass materials for coastal protection is widely recognised in Sardinia. This study highlights that the choice of locations for seagrass debris dumping is extremely important, particularly in a closed, largely urbanised, sedimentary system
Average and local atomic-scale structure in BaZrxTi1-xO3 (x = 0. 10, 0.20, 0.40) ceramics by high-energy x-ray diffraction and Raman spectroscopy
No full textHigh-resolution x-ray diffraction (XRD), Raman spectroscopy and total scattering XRD coupled to atomic pair distribution function (PDF) analysis studies of the atomic-scale structure of archetypal BaZrxTi1-xO3 (x = 0.10, 0.20, 0.40) ceramics are presented over a wide temperature range (100-450 K). For x = 0.1 and 0.2 the results reveal, well above the Curie temperature, the presence of Ti-rich polar clusters which are precursors of a long-range ferroelectric order observed below TC. Polar nanoregions (PNRs) and relaxor behaviour are observed over the whole temperature range for x = 0.4. Irrespective of ceramic composition, the polar clusters are due to locally correlated off-centre displacement of Zr/Ti cations compatible with local rhombohedral symmetry. Formation of Zr-rich clusters is indicated by Raman spectroscopy for all compositions. Considering the isovalent substitution of Ti with Zr in BaZrxTi1-xO3, the mechanism of formation and growth of the PNRs is not due to charge ordering and random fields, but rather to a reduction of the local strain promoted by the large difference in ion size between Zr4+ and Ti4+. As a result, non-polar or weakly polar Zr-rich clusters and polar Ti-rich clusters are randomly distributed in a paraelectric lattice and the long-range ferroelectric order is disrupted with increasing Zr concentration
Temperature Distribution of a Non-flaring Active Region from Simultaneous Hinode XRT and EIS Observations
No full textWe analyze coordinated Hinode X-ray Telescope (XRT) and Extreme Ultraviolet Imaging Spectrometer (EIS) observations of a non-flaring active region to investigate the thermal properties of coronal plasma taking advantage of the complementary diagnostics provided by the two instruments. In particular, we want to explore the presence of hot plasma in non-flaring regions. Independent temperature analyses from the XRT multi-filter data set, and the EIS spectra, including the instrument entire wavelength range, provide a cross-check of the different temperature diagnostics techniques applicable to broadband and spectral data, respectively, and insights into cross-calibration of the two instruments. The emission measure distributions, (EM(T)), we derive from the two data sets have similar width and peak temperature, but show a systematic shift of the absolute values, the EIS (EM(T)) being smaller than the XRT (EM(T)) by approximately a factor two. We explore possible causes of this discrepancy, and we discuss the influence of the assumptions for the plasma element abundances. Specifically, we find that the disagreement between the results from the two instruments is significantly mitigated by assuming chemical composition closer to the solar photospheric composition rather than the often adopted "coronal" composition. We find that the data do not provide conclusive evidence on the high temperature (log T(K) >~ 6.5) tail of the plasma temperature distribution, however, suggesting its presence to a level in agreement with recent findings for other non-flaring regions
Ramanuv rozptyl v olovnatých relaxorových ferroelektrikach
No full textNázev práce: Ramanuv rozptyl v olovnatých relaxorových ferroelektrikach Autor: Iegor Rafalovskyi Ústav: Fyzikální ústav AV ČR, v. v. i. Vedoucí disertační práce: Ing. Jiří Hlinka, Ph.D., Odděleni Dielektrik, Fyzikální ústav AV ČR, v. v. i. Abstrakt: Předkládaná práce se věnuje měřením a analýzám spektra Ramanova rozptylu různých perovskitových feroelektrik, zejména relaxorů na bázi olova ve formě krystalů a tenkých filmů. Zkoumání monokrystalu PMN-0.32PT se složením odpovídajícím mor- fotropní fázové hranici ukázalo, že při ohřívání vzorku v nulovém poli po předchozím ochlazení vzorku v elektrickém poli dochází ke stabilizaci heterofázové struktury s 10-100 µm rovnoběžnými pruhy střídajících se tetragonálních a trigonálních, nebo jim blízkých fázích. Dále byl v PMN-0.32PT zkoumán přechod z trigonální do tetragonální fáze indukovaný elektrickým polem. V relaxoru PFN-0.38PT byla pozorována doménová struktura s 90◦ doménovými stěnami. Struktura a symetrie sousedních domén byly zkoumány pomocí polarizovaného Ramanova rozptylu. Relaxorové feroelektrikum PSN vykazovalo naprosto odlišné chování v polarizovaných Ramanových spektrech monokrys- talu a epitaxiálního tenkého filmu. Úhlová závislost...Title: Lead-based relaxor ferroelectrics by Raman scattering Author: Iegor Rafalovskyi Institute: Institute of Physics of the Czech Academy of Sciences Supervisor: Ing. Jiří Hlinka, Ph.D., Department of Dielectrics, Institute of Physics of the Czech Academy of Sciences Abstract: The following work is dedicated to measurement and analysis of Raman scat- tering spectra of different perovskite ferroelectrics, mainly lead-based relaxors in the form of bulk and thin films. Investigation of single crystal MPB composition PMN-0.32PT has shown that procedure of zero-field heating of previously field-cooled sample leads to sta- bilization of heterophase pattern with 10-100 µm parallel stripes of alternating tetragonal and rhombohedral (rhombohedral-like) phases. Another point of interest investigated in PMN-0.32PT is rhombohedral to tetragonal phase transition induced by electric field. The domain structure with 90-degree domain walls has been observed in relaxor based composition PFN-0.38PT. Adjacent domains were investigated by polarized Raman scat- tering to confirm their structure and symmetry. Relaxor ferroelectric PSN has shown totally different behavior in polarized Raman spectra if studied in the form of single crystal or epitaxial thin film. The normalized cross-polarized intensity of 810 cm−1 band measured in...Katedra fyziky kondenzovaných látekDepartment of Condensed Matter PhysicsMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Therapy Dogs Assisting Those With Autism
No full textDesign of a study to examine the effects of therapy dogs on children and adults diagnosed with autism.Fall 2012Accompanied by video fil
Herramientas virtuales de comunicación como experiencia innovativa de aprendizaje en la Tecnicatura en Turismo Rural de la FAUBA
No full text[EN] This work aims to document the experience of technological innovation
implemented in the Technique of Rural Tourism in the Faculty of Agronomy of
the UBA. The space provided as a formative proposal, through encouraging
own productions in social networks, encourages immersive practice in which
students propose a product and launch it into the virtual world without
intermediation. This practice has been perfected over the years and the results
are very encouraging. We present here TWO of the works presented during the
year 2018 as representative cases of the course taught in the subject “Taller
1”. In addition to the basic training, developed with the guidance of the
teacher, students learn to use tools of greater sophistication and complexity
that are valued as important skills for their professional development.[ES] Este trabajo se propone documentar la experiencia de innovación tecnológica implementada en la Tecnicatura de Turismo Rural en la Facultad de Agronomía de la UBA. El espacio suministrado como propuesta formativa, a través de incentivar las producciones propias en redes sociales, fomenta la práctica inmersiva en la que los estudiantes proponen un producto y lo lanzan al mundo virtual sin intermediaciones. Esta práctica se ha perfeccionado a través de los años y los resultados son muy alentadores. Presentamos aquí DOS de los trabajos presentados durante el año 2018 a modo de casos representativos del curso dictado en la asignatura Taller 1. Además del entrenamiento básico, desarrollado con acompañamiento del docente, los estudiantes aprenden a manejar herramientas de mayor sofisticación y complejidad que son valoradas como capacidades importantes para su desarrollo profesional.Fernández, S.; Deluca Alfano, D. (2019). Herramientas virtuales de comunicación como experiencia innovativa de aprendizaje en la Tecnicatura en Turismo Rural de la FAUBA. En IN-RED 2019. V Congreso de Innovación Educativa y Docencia en Red. Editorial Universitat Politècnica de València. 1629-1640. https://doi.org/10.4995/INRED2019.2019.10277OCS1629164
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