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Search Results: 1 - 10 of 218 matches for " Esmeralda Ricks "
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The experiences of AIDS orphans living in a township
Dalena van Rooyen,Sharon Frood,Esmeralda Ricks
Health SA Gesondheid , 2012, DOI: 10.4102/hsag.v17i1.568
Abstract: An overwhelming challenge to health-care professionals today, is the rendering of care services to AIDS orphans. This article is based on a study that explored and described the lived experiences of AIDS orphans in a township in order to understand their ‘life world’ as AIDS orphans. A further purpose was to provide information to primary health-care nurses (PHCNs), related professionals and partners involved in the care of these children, so that they could plan a care response to meet the orphans’ unique needs. A qualitative research design that used an explorative, descriptive, contextual and phenomenological strategy of inquiry was employed. Data were collected by means of in-depth interviews from a purposively selected sample, and were analysed according to the steps of qualitative data analysis proposed by Tesch (Creswell 1994). Guba’s model was used to ensure the trustworthiness of the qualitative data. Two main themes and their sub-themes were identified. The first theme was that children experience devastating changes in their life circumstances when they become AIDS orphans. The second theme highlighted how the participants rediscovered hope to persevere. Recommendations directed at nursing practice, education and research, were made based upon the findings. Opsomming ‘n Uitdaging wat professionele gesondheidswerkers huidiglik oorweldig, is dienslewering aan VIGS weeskinders. Die doel van die studie was om die geleefde ervaring van kinders wat in dorpsgebiede woon en VIGS weeskinders geword het, te verken en te beskryf ten einde hul leefwêreld te verstaan. Hierdie inligting kan deur Primêre Gesondheidsorg Verpleegkundiges (PVGs), verwante beroepslui en vennote betrokke by die versorging van hierdie kinders, gebruik word as basis om versorging te beplan wat in die kinders se unieke behoeftes sal voorsien. ‘n Kwalitatiewe navorsingsontwerp met verkennende, beskrywende, kontekstuele en fenomologiese strategie van ondersoek, is gebruik. Data is versamel deur middel van in-diepte onderhoude met ‘n doelbewus geselekteerde steekproef. Data is geanaliseer ooreenkomstig die stappe van kwalitatiewe data analise volgens Tesch (in Creswell 1994). Guba se model was gebruik om die betroubaarheid van data te bepaal. Twee hooftemas en hul subtemas is ge dentifiseer. Die eerste tema was dat kinders dramatiese veranderinge in hulle lewensomstandighede ervaar wanneer hulle VIGS weeskinders word. Die tweede tema wat na vore gekom het, was hoe die deelnemers die hoop om voort te gaan met die lewe, herontdek het. Aanbevelings, gebaseer op die bevindinge, is gemaak
Planar CAT(k) Subspaces
Russell Ricks
Mathematics , 2010,
Abstract: Let M_k be the complete, simply connected, Riemannian 2-manifold of constant curvature k \le 0. Let E be a closed, simply connected subspace of M_k with the property that every two points in E are connected by a rectifiable path in E. We show that E is CAT(0) under the induced path metric.
Flat strips, Bowen-Margulis measures, and mixing of the geodesic flow for rank one CAT(0) spaces
Russell Ricks
Mathematics , 2014,
Abstract: Let $X$ be a proper, geodesically complete CAT(0) space and $\Gamma$ be a group acting properly, cocompactly, and by isometries on $X$; further assume $X$ admits a rank one axis. Patterson's construction gives a family of finite Borel measures, called Patterson-Sullivan measures, on $\partial X$. We use the Patterson-Sullivan measures to construct a finite Borel measure (called the Bowen-Margulis measure) on the space of unit-speed parametrized geodesics of $X$ modulo the $\Gamma$-action. This measure has full support and is invariant under the geodesic flow. Although the construction of Bowen-Margulis measures for rank one nonpositively curved manifolds and for CAT(-1) spaces is well-known, the construction for CAT(0) spaces hinges on establishing a new structural result of independent interest about geodesically complete, cocompact rank one CAT(0) spaces: Almost no geodesic, under the Bowen-Margulis measure, bounds a flat strip of any positive width. We also show that almost every point in $\partial X$, under the Patterson-Sullivan measure, is isolated in the Tits metric. Finally, we identify precisely which geodesically complete, cocompact rank one CAT(0) spaces are mixing. That is, we prove that the Bowen-Margulis measure is mixing under the geodesic flow unless $X$ is a tree with all edge lengths in $c \mathbb Z$ for some $c > 0$. This characterization is new, even in the setting of CAT(-1) spaces.
Mathematics Is Motivating
Thomas E. RIcks
Mathematics Educator , 2009,
Abstract: Mathematics is motivating; at least, it should be. I argue that mathematical activity is an inherently attractive enterprise for human beings because as intellectual organisms, we are naturally enticed by the intellectual stimulation of mathematizing, and, as social beings, we are drawn to the socializing aspects of mathematical activity. These two aspects make mathematics a motivating activity. Unfortunately, the subject that students often encounter in school mathematics classes does not resemble authentic mathematical activity. School mathematics is characterized by the memorization and regurgitation of rote procedures in isolation from peers. It comes as no surprise that many students have little motivation to continue mathematics study because it lacks intellectual and social appeal. I suggest several practical changes in school mathematics instruction that are drawn from the literature. These changes will lead to instruction that more readily engages students with the subject because they are rooted in the intellectually and socially appealing aspects of mathematics.
Colonne d’acqua oscillanti come risorsa energetica costiera
Esmeralda Tuccimei
GEOmedia , 2012,
Abstract: Nel panorama delle fonti rinnovabili attualmente esistenti hanno avuto notevole impulso, soprattutto nell’ultimo decennio, le tecnologie di produzione dell’energia dal moto ondoso. Tra le principali tecnologie esistenti in merito, quella delle Colonne d’Acque Oscillanti (OWC, Oscillating Water Columns) è ben avanzata e ricerche di vario tipo sono in atto anche nel nostro Paese, tuttavia, le particolari condizioni del Mare Mediterraneo, ed altri fattori, pongono vincoli d’impiego che richiedono ulteriori ricerche e sperimentazioni. Oscillating Water Columns as coastal energy source. In the wide range of existing renewable energy sources, the last decade witnessed the great boost given to wave energy production technologies. Among them, the technology of Oscillating Water Columns is well advanced and different types of research are underway also in Italy. The specific conditions of the Mediterranean Sea and other factors, however, impose utilization constraints that require further research and testing.
Anne Dijkman, Opzij & aan de kant met haar. De constructie van norm en afwijking in Opzij tussen 1972 en 2002
Esmeralda Tijhoff
TS·> Tijdschrift voor Tijdschrift-studies , 2010,
Abstract:
Preliminary Informative Results on Glass Tesserae from Vth-VIth Century AD Mosaics in Albania  [PDF]
Esmeralda Vataj, Nikolla Civici, Teuta Dilo
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.37006
Abstract: This paper discusses some preliminary results regarding raw materials used in ancient glass mosaic tesserae. The studied glass tesserae were recovered during the archeological excavation of the mosaics at the Christian basilicas in Byllis, Lin and Elbasan, which according to the archeologists were built between the end of Vth and beginning of VIth century AD. In the recent years, several studies are performed on opaque coloured glass but in Albania only few studies are performed in this field. These samples are analyzed using optical microscopy and micro X-ray fluorescence. Optical microscopy is used to analyse the microstructure of the glass tesserae. The main elements and trace elements are determined qualitatively from measurements performed with micro X-ray fluorescence. The glass matrix resulted to be very heterogeneous with too many inclusions dispersed on it. Several elements which are responsible for the color and opacity of glass tesserae are determined. Comparisons are made between the same colors of glass tesserae from different archaeological sites.
Isolated displaced non-union of a triquetral body fracture: a case report
Sonia Rasoli, Matthew Ricks, Greg Packer
Journal of Medical Case Reports , 2012, DOI: 10.1186/1752-1947-6-54
Abstract: We report the case of a 29-year-old Caucasian British man who sustained an isolated displaced triquetral body fracture that resulted in non-union, who was treated surgically. We describe an original operative management for this debilitating injury. An open reduction and internal fixation using double headed compression screws was performed, without bone grafting, and with early immobilization of the wrist.We propose this novel approach and advocate early clinical suspicion of triquetral body fractures in patients with a history of fall on an outstretched hand and ulnar sided wrist pain. We recommend evaluation using computed tomography or magnetic resonance imaging scanning.Triquetral fractures are the second most common carpal fractures after fractures of the scaphoid. There are two broad types, those involving the dorsal aspect of the bone (chip fractures), and those involving the body. Triquetral body fractures are less common of the two, and these fractures can be associated with non-union. Although non-union of triquetral body fractures is rare, with only three cases described so far in the medical literature [1-3], they are associated with considerable morbidity and reduction in functional activities. These fractures can also be missed on plain X-rays [4].We report a case of displaced isolated triquetral body fracture that resulted in non-union, treated successfully with open reduction and internal fixation using compression screws without bone grafting, and with early mobilization of the wrist. To the best of our knowledge, this scenario has not been previously described in the literature.A 29-year-old Caucasian British man fell onto his outstretched right hand with his wrist in dorsiflexion while playing football, and injured his wrist. He presented to our clinic three weeks after the fall complaining of persistent pain in his wrist. Examination of the wrist found discrete tenderness over the ulnar aspect of the wrist. There was no evidence of instability o
The experiences of AIDS orphans living in a township
D van Rooyen, S Frood, E Ricks
Health SA Gesondheid , 2012,
Abstract: An overwhelming challenge to health-care professionals today, is the rendering of care services to AIDS orphans. This article is based on a study that explored and described the lived experiences of AIDS orphans in a township in order to understand their ‘life world’ as AIDS orphans. A further purpose was to provide information to primary health-care nurses (PHCNs), related professionals and partners involved in the care of these children, so that they could plan a care response to meet the orphans’ unique needs. A qualitative research design that used an explorative, descriptive, contextual and phenomenological strategy of inquiry was employed. Data were collected by means of in-depth interviews from a purposively selected sample, and were analysed according to the steps of qualitative data analysis proposed by Tesch (Creswell 1994). Guba’s model was used to ensure the trustworthiness of the qualitative data. Two main themes and their sub-themes were identified. The first theme was that children experience devastating changes in their life circumstances when they become AIDS orphans. The second theme highlighted how the participants rediscovered hope to persevere. Recommendations directed at nursing practice, education and research, were made based upon the findings.
Antenna Selection for MIMO Systems with Closely Spaced Antennas
Yang Yang,Blum RickS,Sfar Sana
EURASIP Journal on Wireless Communications and Networking , 2009,
Abstract: Physical size limitations in user equipment may force multiple antennas to be spaced closely, and this generates a considerable amount of mutual coupling between antenna elements whose effect cannot be neglected. Thus, the design and deployment of antenna selection schemes appropriate for next generation wireless standards such as 3GPP long term evolution (LTE) and LTE advanced needs to take these practical implementation issues into account. In this paper, we consider multiple-input multipleoutput (MIMO) systems where antenna elements are placed side by side in a limited-size linear array, and we examine the performance of some typical antenna selection approaches in such systems and under various scenarios of antenna spacing and mutual coupling. These antenna selection schemes range from the conventional hard selection method where only part of the antennas are active, to some newly proposed methods where all the antennas are used, which are categorized as soft selection. For the cases we consider, our results indicate that, given the presence of mutual coupling, soft selection can always achieve superior performance as compared to hard selection, and the interelement spacing is closely related to the effectiveness of antenna selection. Our work further reveals that, when the effect of mutual coupling is concerned, it is still possible to achieve better spectral efficiency by placing a few more than necessary antenna elements in user equipment and applying an appropriate antenna selection approach than plainly implementing the conventional MIMO system without antenna selection.
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