Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2018 ( 1 )

2017 ( 2 )

2016 ( 3 )

2015 ( 13 )

Custom range...

Search Results: 1 - 10 of 505 matches for " Sandy;Rodas "
All listed articles are free for downloading (OA Articles)
Page 1 /505
Display every page Item
House improvements and community participation in the control of Triatoma dimidiata re-infestation in Jutiapa, Guatemala
Monroy, Carlota;Bustamante, Dulce Maria;Pineda, Sandy;Rodas, Antonieta;Castro, Xochitl;Ayala, Virgilio;Qui?ónes, Javier;Moguel, Bárbara;
Cadernos de Saúde Pública , 2009, DOI: 10.1590/S0102-311X2009001300016
Abstract: the deterioration or absence of plaster walls in houses and poor hygienic conditions are the most important risk factors for indoor triatoma dimidiata infestation in guatemala. a cross-disciplinary study was conducted addressing t. dimidiata infestation, household hygiene, and housing construction. the study focused on local materials and cultural aspects (including gender roles) that could lead to long-term improvements in wall construction. a new plaster mix for walls was developed on the basis of laboratory studies on construction materials recommended by local villagers. four villages with persistent (post-spraying) t. dimidiata infestation were studied. in two villages, an ecosystem approach was implemented, and the homeowners conducted wall improvements and household sanitation with the support of the interdisciplinary team (the ecosystem intervention). in the other two villages, a vector control approach based on insecticide spraying was adopted (traditional intervention). both interventions were associated with a reduction in t. dimidiata infestation, but only the ecosystem approach produced important housing improvements (sanitation and wall construction) capable of preventing t. dimidiata re-infestation in the long term.
Risk factors for intradomiciliary infestation by the Chagas disease vector Triatoma dimidiatain Jutiapa, Guatemala
Bustamante, Dulce Maria;Monroy, Carlota;Pineda, Sandy;Rodas, Antonieta;Castro, Xochitl;Ayala, Virgilio;Qui?ónes, Javier;Moguel, Bárbara;Trampe, Ranferi;
Cadernos de Saúde Pública , 2009, DOI: 10.1590/S0102-311X2009001300008
Abstract: seventeen variables were evaluated as possible risk factors for the intradomiciliary infestation with triatoma dimidiata in 644 houses in jutiapa, guatemala. during 2004 the houses were assessed for vector presence and evaluated for hygiene, cluttering, material comfort, construction conditions and number of inhabitants, among other factors. chi-square analysis detected significant associations between vector presence and eight variables related to domestic sanitary and construction conditions. log-linear models showed that regardless of the age of the house, the odds of vector presence were 4.3 and 10 times lower in houses with a good socioeconomic status compared with poor and very poor houses respectively. log-linear models also pointed to a greater chance of vector presence when walls lacked plastering (3.85 times) or walls had low quality-incomplete plastering (4.56 times), compared with walls that were completely plastered. control strategies against t. dimidiata should include the introduction of better-quality but inexpensive plastering formulations and better sanitation practices should also be promoted among the population. such control strategies should not only reduce or eliminate infestation, but also prevent vector reinfestation.
Symmetric Identities from an Invariant in Partition Conjugation and Their Applications in q-Series  [PDF]
Sandy H. L. Chen
Open Journal of Discrete Mathematics (OJDM) , 2014, DOI: 10.4236/ojdm.2014.42006

For every partition \"\" and its conjugation \"\", there is an important invariant \"\" \"\", which denotes the number of different parts. That is \"\", . We will derive a series of symmetric q-identities from the invariant in partition conjugation by studying modified Durfee rectangles. The extensive applications of the several symmetric q-identities in q-series  [1] will also be discussed. Without too much effort one can obtain much well-known knowledge as well as new formulas by proper substitutions and elementary calculations, such as symmetric identities, mock theta functions, a two-variable reciprocity theorem, identities from Ramanujan’s Lost Notebook and so on.

Measurement of Gamma-Rays Using Smartphones  [PDF]
Sandy Tith, Nares Chankow
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.61004
Abstract: The CMOS (Complementary Metal Oxide Semiconductor) image sensor of a smartphone has been known for its sensitivity to gamma-rays. In this research, some smartphones were selected and tested for measurement of gamma-rays emitted from Cesium-137 and Iridium-192 sources. During measurements, the phones were set in video mode while the camera lenses were covered with black adhesive tape to prevent light exposure. Interaction of gamma-rays with the CMOS appeared as flashing bright spots on the image. The bright spots were then counted by using the freely available ImageJ software. Preliminary results indicated that the number of bright spots increased linearly with increase of gamma-ray dose rate. An in-house Android application software was then developed for real-time counting of the bright spots. The application software also allowed users to input a calibration equation so that the phones could simultaneously convert the count rate to display in dose rate. This research demonstrated that, after appropriate calibration, smartphones could be used as gamma-ray measuring devices for radiation safety control involving high activity sources such as in industrial radiography, gamma-ray irradiation facility and medical treatment.
In Search of Inclusive Growth: The Role of Economic Institutions and Policy  [PDF]
Francis Y. Kumah, Mathew Sandy
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.411081

Inclusive economic growth is one of key challenges facing countries across the globe, notwithstanding initial conditions, particularly following the 2008 global economic slowdown. This paper searches for links between the quality of institutions, economic policies, economic growth and employment creation in low-income countries, using the specific case of Sierra Leone to illustrate. While its findings are consistent with the literature, the paper suggests that re-focusing economic policies on per capita real GDP growth may yield employment dividends, but well-targeted interventions would be needed to cater for the unemployed and to support vulnerable groups which may be adversely impacted by the very policies that drive growth.

Non-Dimensional Values for Convergence of Lift Prediction Using Panel Method  [PDF]
Rodas I. Fernando, Castillo C. Pablo
Open Journal of Fluid Dynamics (OJFD) , 2017, DOI: 10.4236/ojfd.2017.71003
Abstract: This paper presents an implementation and posterior analysis of the convergence of the panel method. The implemented panel method is based on vortex lines and an unsteady wake on a flat plate as a wing. The main goal of the study was to discover parameters and their values range to obtain convergence of the solution. Results of lift convergence in function of control panel’s position, the effect of the size of the wake panels, the dimension of the wake, and the computation time are quantitatively described. The lift results are similar to the predictions by the lifting-line theory and the wake exhibited an expected shape, showing wingtip, and start vortices. Geometric parameters and non-dimensional values were developed to increase accuracy and stability of the method.
New Frames for Old Masters. An overview of the British Library's Acetate Transfer programme
Sandy Ryan
Liber Quarterly : The Journal of European Research Libraries , 2005,
Abstract: After the second International Round Table on acetate microfilm, the British Library decided to top slice from its annual preservation budget, £200k every year for five years to address its cellulose acetate problem. We did this by instigating a programme of base transfer, transferring the frames from the old acetate masters onto new polyester stock. It proved to be quite a challenge and this paper reproduces largely the presentation given at CAMF, which was an overview of the background to the project and its progress. Twenty three million feet. Not a centipedes' picnic, but the amount of acetate microfilm the British Library has in its collections. A sobering statistic. But what does it really mean? Well, if we rolled it all out, it would be enough to stretch all the way from New York to Moscow. Or, for the more vertically minded, if we piled it all up, it would be taller than not just 1 Mount Everest, but 809. That represents a pretty huge problem whichever way you look at it and my first thought when it was handed to me was, 'where on earth do we start?'
Readiness to adopt e-learning: pioneering a course in school librarianship education
Sandy Zinn
South African Journal of Libraries and Information Science , 2009, DOI: 10.7553/75-2-96
Abstract: E-learning has come of age in South African higher education but scepticism, caution and an inadequate reward system for innovative teaching methods have resulted in a slow uptake by academics. Within this milieu the author pioneered a course in the ACE School Librarianship programme. The study describes the e-learning experiences of the course participants gleaned from questionnaire responses to questions related to experiences of ICTs, the Internet and online learning, ability to navigate the e-learning environment, utilization of elements of the learning management system and implementation of course ideas in their respective schools and personal lives. The study also provides an opportunity for the author to reflect on her pioneering experiences with e-learning and how she would approach it differently next time. The main lessons learned were that 1) the e-learning environment is not necessarily intuitive and participants need opportunities to digest novel features such as the discussion forum; 2) several of the advantages and disadvantages of e-learning that appear in the research literature are identified in this study; and 3) setting up an e-learning course is best achieved incrementally.
Sandy Watson
PLATFORM : Journal of Media and Communication , 2011,
Sandy Watson
PLATFORM : Journal of Media and Communication , 2011,
Abstract: Walker’s most recent work, with Gregory Smithers, explores the emergence of discourses of post-raciality during the 2008 United States election campaign (Walker and Smithers 2009) where Walker argued that the historical superficiality of journalism exacerbates racial tensions rather than creating greater cultural understanding on racial issues (2009, p. 39). In this interview, he discusses the applicability of what he describes as reactionary discourses (that of post-raciality, colour blindness and colour neutrality) in the context of shifting media usage and tensions arising from perceived challenges to the dominant, white-centred national imaginary.
Page 1 /505
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.