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Search Results: 1 - 10 of 423799 matches for " S. K. Ernest "
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Risk Factors, Clinical Features, Baseline Alanine Aminotransferase and CD4+ Count of Children with HIV Co-Infection with Hepatitis B and C at a Tertiary Hospital in Southwest Nigeria  [PDF]
M. O. Durowaye, S. K. Ernest, I. A. Ojuawo
International Journal of Clinical Medicine (IJCM) , 2016, DOI: 10.4236/ijcm.2016.74030
Abstract: Background: Human immunodeficiency virus and hepatitis B and C viruses are endemic in sub- Saharan African countries including Nigeria. Researchers have studied the burden of co-infection of HIV with hepatitis B and hepatitis C but the risk factors and clinical presentation have not been much addressed especially in children. Methodology: This was a prospective cross sectional study that determined the prevalence, risk factors, clinical features, baseline CD4+ count, CD4+ percentage, and alanine aminotransferase (ALT) of newly diagnosed, HAART na?ve HIV co-infection among children who were managed at a Tertiary Hospital in Ilorin, Nigeria. Result: Of the 60 HIV- infected children recruited, 11.7% had HIV co-infection with HBV or HCV. Children with co-infec- tions (mean age 8.43 ± 2.37 years) were significantly older than their HIV mono-infected counterparts (mean age 5.25 ± 3.96 years) (p = 0.011). There was no significant difference between HIV monoinfection and HIV co-infection with respect to gender (p = 0.758), ethnicity (p = 0.707), religion of parents (p = 0.436), family type (p = 0.184), social class (p = 0.535), previous transfusion (p = 0.053), scarification (p = 0.612), female genital mutilation (p = 0.778), and sharing of clippers (p = 0.806). The mean BMI, immunological staging (p = 0.535), baseline ALT (p = 0.940), and mean baseline CD4+ count (p = 0.928) were comparable. However, the body mass index of HIV co-infec- ted children decreased with age up till age 10 years. Conclusion: There were no risk factors, nor clinical features predictive of co-infection identified in this study. Co-infection did not negatively impact baseline, CD4+ count and ALT.
Singlet fermion dark matter and electroweak baryogenesis with radiative neutrino mass
Babu, K. S.;Ma, Ernest
High Energy Physics - Phenomenology , 2007, DOI: 10.1142/S0217751X08040299
Abstract: The model of radiative neutrino mass with dark matter proposed by one of us is extended to include a real singlet scalar field. There are then two important new consequences. One is the realistic possibility of having the lightest neutral singlet fermion (instead of the lightest neutral component of the dark scalar doublet) as the dark matter of the Universe. The other is a modification of the effective Higgs potential of the Standard Model, consistent with electroweak baryogenesis.
Dielectric properties of Poly(methyl methacrylate) (PMMA)/CaCu3Ti4O12 Composites
P. Thomas,R. S. Ernest Ravindran,K. B. R. Varma
Physics , 2013,
Abstract: Materials with high dielectric constant are in great demand for the miniaturization of electronic devices. More specifically, high dielectric constant polymer-ceramic composites are useful for embedded capacitor applications. A composite consisting of giant dielectric CaCu3Ti4O12 (CCTO) incorporated into the Poly(methyl methacrylate) (PMMA) polymer matrix has been fabricated by melt mixing followed by hot pressing. The composites thus fabricated has been characterised for structural, morphological and dielectric properties. The composites dielectric constants had increased when the CCTO content increased in the PMMA matrix. The dielectric constant of PMMA is around 4.9 @ 100Hz which has increased to 15.7 @ 100Hz when the ceramic content has increased to 40 Vol %. At low frequencies, space charge polarisation is dominant. This composite also exhibited remarkably low dielectric loss at high frequency, which makes this composite a suitable candidate for the capacitors in high frequency application.
Fabrication and Characterization of Poly(methyl methacrylate)CaCu3Ti4O12 Composites
P. Thomas,R. S. Ernest Ravindran,K. B. R. Varma
Physics , 2013,
Abstract: Composites comprising Poly(Methyl Methacrylate) (PMMA) and CaCu3Ti4O12 (CCTO) via melt mixing followed by hot pressing were fabricated. These were characterized using X-ray diffraction (XRD), thermo gravimetric (TGA), scanning electron microscopy (SEM) and Impedance analyser for their structural, morphology and dielectric properties. Composites were found to have better thermal stability than that of pure PMMA. The composite, with 38 Vol % of CCTO (in PMMA), exhibited remarkably low dielectric loss at high frequencies and the low frequency relaxation is attributed to the space charge polarization MWS effect. Theoretical models were employed to rationalise the dielectric behaviour of these composites. At higher temperatures, the relaxation peak shifts to higher frequencies, due to the merging of both {beta} and {alpha} relaxations into a single dielectric dispersion peak. The AC conductivity in the high frequency region was attributed to the electronic polarization
Structural, Thermal and Electrical properties of Poly(methyl methacrylate)-CaCu3Ti4O12 composite sheets fabricated via melt mixing
P. Thomas,R. S. Ernest Ravindran,K. B. R. Varma
Physics , 2013,
Abstract: Poly(Methyl Methacrylate) (PMMA) and CaCu3Ti4O12 (CCTO) composites were fabricated via melt mixing followed by hot pressing technique. These were characterized using X-ray diffraction (XRD), thermo gravimetric (TGA), Thermo Mechanical (TMA), Differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), and Impedance analyser for their structural, thermal and dielectric properties. Composites were found to have better thermal stability than that of pure PMMA. However, there was no significant difference in the glass transition (Tg) temperature between the polymer and the composite. The appearance of additional vibrational frequencies in the range 400-600 cm-1 in FTIR spectra indicated a possible interaction between PMMA and CCTO. The composite, with 38 Vol % of CCTO (in PMMA), exhibited remarkably low dielectric loss at high frequencies and the low frequency relaxation is attributed to the space charge polarization/MWS effect. The origin of AC conductivity particularly in the high frequency region was attributed to the electronic polarization.
Some atmospheric aerosol characteristics as determined from laser angular scattering measurements at a continental urban station
ERNEST RAJ, P.;DEVARA, P. C. S.;PANDITHURAI, G.;MAHESKUMAR, R. S.;DANI, K. K.;
Atmósfera , 2004,
Abstract: a bistatic continuous wave argon ion lidar system has been used to collect information on the variation of laser return signal strength from the lower atmosphere with scattering angles at a fixed altitude of scattering. lidar data collected on 50 clear sky days during the period of april 1987 - december 1995 at a continental tropical urban station have been used for the study. the experimental data have been compared with the theoretically computed differential mie scattering cross sections at the common scattering angles to determine the most probable value of size index, v, and the complex index of refraction, m, applicable to the environment over the observing site by adopting a library-search method and simple statistical tools. the study showed that the most frequently occurring aerosol type at the location is dust-like with a most probable value of size index 4.5. retrieval of aerosol number concentration, using this information together with the experimental values of scattered signal strength, yields an average concentration value in the range of 2 x 3 103 cm-3 in the atmos pheric layer close to the surface.
Working Conditions and Productivity Under Private and Public Logging Companies in Tanzania
Dos Santos A. Silayo,Said S. Kiparu,Ernest W. Mauya,Dunstan T. K. Shemwetta
Croatian Journal of Forest Engineering , 2010,
Abstract: Industrial timber harvesting in plantation forests in Tanzania was solely performed by public agencies until mid 1980’s. During that period harvesting operations were labour-intensive and semi-mechanized, coupled with low production rates and high production costs. Following the privatization of forestry industries, logging is currently being carried out by private companies. This study was carried out to assess and compare working conditions, physical workload and productivity in logging operations under private and public logging regimes. Data were collected in Sao Hill Forest plantations from a clear felling operation being carried out in a 26 years old Pinus patula stand. Time study was undertaken for tree cutting, skidding, manual bunching and loading operations. Physical workload data were obtained through heart rate measurement by using portable electronic heart rate monitor. Working conditions were assessed through ergonomic checklist administered to 45 loggers. The results indicated that the productivity in tree cutting averaged 4.7m3/h and 3.4m3/h for chainsaw and crosscut operations respectively, while in bunching and loading the respective values of 5.1m3/h and 11.3m3/h made higher production on the private regime as compared to the public. The working conditions were generally poor with low safety, inadequate payment and poor working tools coupled with high labour turnover. The physical workload was 78% and 65% heart rate increase for crosscut saw and chainsaw crews. This is a slight increase compared to the public logging regime estimated at 65% and 57% increase for crosscut saw and chainsaw respectively. However, the increased productivity observed in the private regime was not due to improved working conditions, but rather a result of the workers’ higher engagement and placed effort in performing production tasks. Training of the crews, improvement of payments, supervision and provision of safety gears are recommended for improved production and reduced occupational health hazards.
Temporal variations in sun photometer measured precipitable water in near IR band and its comparison with model estimates at a tropical Indian station
ERNEST RAJ, P;DEVARA, P. C. S;SAHA, S. K;SONBAWNE, S. M;DANI, K. K;PANDITHURAI, G;RAMANA MURTHY, A;
Atmósfera , 2008,
Abstract: multi-channel sun photometer observations of precipitable water content (pwc) in the near-infrared band over a tropical indian station, pune, during the period may 1998-may 2006 have been used to investigate temporal and seasonal variations. precipitable water estimated from surface meteorological parameters (temperature and relative humidity) and that obtained from modis satellite for the same station have been compared with those observations made by the sun photometer. there exists a well defined seasonal variation in precipitable water content with maximum during southwest monsoon months (june-september) and minimum during the month of march. variability in pwc is higher during post-monsoon and winter months (october to february) and smaller during pre-monsoon and monsoon months (march to september). the overall mean pwc measured by sun photometer at pune is 13.27 mm. precipitable water estimated from surface meteorological parameters and that obtained from satellite retrieval are higher in magnitude compared to that from the ground-based sun photometer measurements. however, the temporal variations on all time scales agree very well and are in-phase. a well calibrated portable sun photometer operated at the near infrared wavelengths would give very good temporal observations of precipitable water at any location.
La irrupción del liberalismo fiscal en Nueva Espa?a: la contribución directa general y extraordinaria (1813-1815)
Sánchez Santiró, Ernest;
América Latina en la historia económica , 2012,
Abstract: the article discusses the introduction of a general and extraordinary direct tax in new spain in 1813 as a demonstration of one of the many initiatives taken by the colonial regime in order to obtain resources to fight the insurgency. the paper shows the origins, evolution and subsequent failure of a tax reform that represented the advent of income tax under modern standards, in the context the transition from the ancient regime to liberalism.
La irrupción del liberalismo fiscal en Nueva Espa a: la contribución directa general y extraordinaria (1813-1815)
Ernest Sánchez Santiró
América Latina en la historia económica , 2012,
Abstract: El artículo analiza la introducción de la contribución directa general y extraordinaria en Nueva Espa a en 1813, como muestra de una de las tantas iniciativas que adoptó el régimen virreinal en aras de allegarse recursos para combatir a la insurgencia. El trabajo expone los orígenes, evolución y ulterior fracaso de una reforma fiscal que representó la irrupción del impuesto sobre la renta, bajo parámetros modernos, en el marco de la transición del antiguo régimen al liberalismo. The article discusses the introduction of a general and extraordinary direct tax in New Spain in 1813 as a demonstration of one of the many initiatives taken by the colonial regime in order to obtain resources to fight the insurgency. The paper shows the origins, evolution and subsequent failure of a tax reform that represented the advent of income tax under modern standards, in the context the transition from the Ancient Regime to Liberalism.
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