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Search Results: 1 - 10 of 829 matches for " Usman Aliyu "
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Delayed Presentation of Patients with Gynaecological Malignancies in Kano, North-Western Nigeria  [PDF]
Natalia Adamou, Usman Aliyu Umar
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.56048
Abstract: The diagnosis and management of gynaecological cancers are still challenging in low- and middle-income countries. In patients with gynaecological malignancies delay at any point increases morbidity and mortality. This study evaluated the factors that may delay presentation, diagnosis and treatment of patients with malignant gynaecological cancers, and described the duration of each delay. It was a prospective cross-sectional study. A total number of 96 patients diagnosed to have gynaecological malignancy were enrolled in the study between the April 2014 and April 2015. The median age was 47.5 years (range of 18 - 84 years). The diagnoses on admission were cervical malignancy 34 (35.42%), ovarian malignancy 32 (33.33%), chorio carcinoma 15 (15.63%), cancers of uterine body (endometrial and leiomyosarcoma) 10 (10.42%) and vulval malignancies 5 (5.2%). Majority of the patients 65 (67.7%) presented late at either stage III or IV. At presentation, 36 patients (37.5%) had severe anaemia; 10 patients (10.41%) had obstructive uropathy; 3 (3.13%) developed fistula; 19 (19.79%) died on admission from complication of their disease. Most patients 61 (63.54%) had delayed presentation of more than 90 days (“patients delay”). Time in decision ranged between 3 days to maximum of 2920 days and median of 150 days. 58 (60.42%) gave a reason for such delay as lack of knowledge of their presenting symptoms, as a warning sign of possible malignancy; 80 (83.33%) had delay in diagnosis (“doctor delay”); 40 (41.67%) reported that the medical practitioner did not make referral to the center with available gynaecological services; “hospital delay” was observed in 66 (68.75%) of patients. The reason for delayed treatment in 35 (36.46%) of patients was severe patients condition that warrant stabilization (blood transfusion and dialysis) and 29 (30.21%) could not afford the treatment. Late presentation is a great problem in the management of oncological patients in this environment. High cost of care is the major challenge for the patients and gynaecologist in north-western part of Nigeria.
Asymptomatic Bacteriuria in Pregnant Women in the Antenatal Booking Clinic at Aminu Kano Teaching Hospital, Kano, Nigeria  [PDF]
Kani Yamuna Aminu, Umar Usman Aliyu
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.55042
Abstract:

Asymptomatic bacteriuria is common in pregnant women and if untreated could lead to serious complications. Despite this, its prevalence and microbiological characteristics have not been well studied in Kano and they vary among different populations. The objective of the study was to determine the prevalence, microbiological characteristics and pregnancy outcome of asymptomatic bacteriuria in pregnancy among women who came for antenatal booking clinic at the Aminu Kano Teaching Hospital (AKTH) Kano. A cross sectional descriptive study was conducted among randomly selected 200 consenting pregnant women who came for antenatal booking from November 2010 to January 2011. Samples of 10 - 15 mls urine were examined for pus cells and bacteria and then cultured on cysteine lactose electrolyte deficient agar. Colony counts yielding bacterial growth of 105/ml or more of pure isolates were deemed significant. Isolates were identified to specie level. Antibiotic sensitivity test was done, treatment was given and pregnancy outcome was determined. Urinalysis and Full Blood Count were done. The prevalence of asymptomatic bacteriuria in pregnancy was 9%. Parity and Pyuria had statistically significant association with asymptomatic bacteriuria (P < 0.05). The commonest organisms isolated wereKlebsiellaspp. andStaphylococcus saprophyticus. Following treatment of asymptomatic bacteriuria, there was no statistically significant difference in pregnancy outcome compared to patients who did not have the condition. The incidence of asymptomatic bacteriuria in pregnancy in AKTH is low. Screening of pregnant women using urine microscopy culture and sensitivity should be reserved for pregnant women with higher risk of developing asymptomatic bacteriuria.

Triangle Method for Estimating Soil Surface Wetness from Satellite Imagery in Allahabad District, Uttar Pradesh, India  [PDF]
Abba Aliyu Kasim, Abubakar Aminu Usman
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.41010
Abstract: Soil surface wetness is indispensable land surface parameter in agriculture, hydrology and environmental engineering. This paper explores the relationship between surface radiant temperature and fractional vegetation cover derived from satellite imagery to estimate soil surface wetness (triangle method) in Allahabad district. The pixel distributions create triangular shapes because the range of surface radiant temperature decreases as the amount of vegetation cover increases and sufficient number of pixels exists. A very weak correlation is found between the simulated soil surface wetness and ground measured soil moisture at deeper soil layers (R2 < 0.15) on all the dates under investigation. This is because the drying rates at the surface discontinue to be linearly correlated to that at lower levels (depths). The standing water pixels distort the shape of the triangle especially at lower left edge of the triangle. This distortion is removable. The spatial and temporal inhomogeneity of soil surface wetness is examined.


Mathematical Model for the Transmission Dynamics of Zika Virus Infection with Combined Vaccination and Treatment Interventions  [PDF]
Sulaiman Usman, Ibrahim Isa Adamu, Huzaifa Aliyu Babando
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.510166
Abstract: In this paper, we studied the transmission dynamics of ZIKV in the presence of a vector under the combined effects of treatment and vaccination in a hypothetical population. The disease-free εo and endemic ε1 equilibria were established with local stability on εo. We established the basic reproduction number Ro which served as a threshold for measuring the spread of the infection in the population using the next-generation matrix and computed its numerical value to be Ro = 0.0185903201 using the parameter values. It was established that the disease-free equilibrium εo is locally asymptotically stable since Ro < 1; meaning ZIKV infection would be eradicated from the population. The computational results of the study revealed that combining the two interventions of vaccination and treatment concomitantly proffers an optimal control strategy in taming the transmission of the virus than a single intervention strategy.
Minimizing Interference on GSM BCCH Channel Using Particle Swarm Optimization
Jibrin M. Sadiq,Aliyu Ozovehe,Abraham U. Usman
Journal of Mobile Communication , 2012, DOI: 10.3923/jmcomm.2010.91.95
Abstract: The easiest means of increasing capacity of a cellular network without compromising quality of service is through frequency reuse. However, frequency reuse usually results in certain additive and system-generated cellular types of channel interference (co-channel and adjacent channel). In this study, Particle Swarm Optimization (PSO) algorithm was employed to efficiently manage frequency reuse through a neighbour allocation list in order to reduce co-channel and adjacent channel interference to the barest minimum on a live GSM network. Co-channel interference was completely eliminated while adjacent channel interference was reduced by 55% which has a positive impact on the system performance.
Spatio-Temporal Assessment of Vegetation Resource Dynamics in Nigeria from SPOT Satellite Imageries  [PDF]
Sadiq Abdullahi Yelwa, Aliyu Bilya Sanda, Umar Usman
American Journal of Climate Change (AJCC) , 2019, DOI: 10.4236/ajcc.2019.84027
Abstract: Vegetation resources in Nigeria are of vital importance for the sustainable development of the country. However, this essential resource is in danger due to the effect of anthropogenic and climate induced impacts. Currently desert encroachment which cuts across the Sahel is affecting most of the states in the northern part of the country particularly the eleven states considered by the Federal Ministry of Environment in Nigeria as the frontline states. Several studies on the Nigerian environment have shown that there are serious threats to the general environment particularly vegetation. Due to population growth and the need for housing as well as the expansion of the over-utilised farmlands across these states, places considered as reserved areas across the country are being exploited to the detriment of the vegetal resources particularly the forest and rangeland areas. This study utilized Idrisi TerrSet (version 18) raster-based remote sensing and GIS software to analyse seventy two (72) dekadal Normalised Vegetation Index (NDVI) imageries from SPOT satellite covering Nigeria in order to assess the anthropogenic and likely climatic impacts on the vegetal resources using the forward t-mode Principal Component Analysis (PCA) with standardised principal components. Results indicated that Component 1 which explains about 69% of the 72 time-series NDVI imageries shows typical vegetation cover over the study area within the time period under study. While component two indicated a cyclic trend differentiating the ENSO events of 1999 and 2009; component three indicated positive anomaly pattern of vegetation NDVI mostly within Sokoto, Kebbi, Kano, Jigawa and the northern parts of Bauchi, Yobe and Borno states. However, Component four imagery indicated a likely link to the 2009 flood that affected Kainji dam and rivers Niger and Benue. For a better result, the integration of socio-economic and high spatial resolution data into an assessment of this kind in future studies is encouraged.
The Effect of Hygroscopic Growth on Continental Aerosols  [PDF]
Bello Idrith Tijjani, Aliyu Aliyu, Fatima Shuaibu
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.36048
Abstract: In this paper, the authors investigated some microphysical and optical properties of continental clean aerosols from OPAC to determine the effect of hygroscopic growth at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (RHs) (0%, 50%, 70%, 80%, 90%, 95%, 98% and 99%). The microphysical properties extracted were radii, volume mix ratio, number mix ratio and mass mix ratio as a function of RH while the optical properties are scattering and absorption coefficients and asymmetric parameters. Using the microphysical properties, growth factors of the mixtures were determined while using optical properties the enhancement parameters were determined and then parameterized using some models. We observed that the data fitted the models very well. The angstrom coefficients show that the mixture has bimodal type of distribution with the dominance of fine mode particles.
An Inventory Model for Deteriorating Items with Generalised Exponential Decreasing Demand, Constant Holding Cost and Time-Varying Deterioration Rate  [PDF]
Isiyaku Aliyu, Babangida Sani
American Journal of Operations Research (AJOR) , 2018, DOI: 10.4236/ajor.2018.81001
Abstract: In this present paper, an inventory model with a generalised exponential decreasing demand is considered. A numerical example is used to illustrate the application of the model. Sensitivity analysis of the optimal solution with respect to various parameters is carried out to see the effect of parameter changes on the solution.
The Effect of Relative Humidity on Continental Average Aerosols  [PDF]
Bello Idrith Tijjani, Aliyu Aliyu, Fatima Sha’aibu
Open Journal of Applied Sciences (OJAppS) , 2014, DOI: 10.4236/ojapps.2014.47038
Abstract: In this paper, the authors extracted and investigated the effect of relative humidity (RH) on some microphysical and optical properties of continental polluted aerosols from OPAC (Optical Properties of Aerosols and Clouds) at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (0%, 50%, 70%, 80%, 90%, 95%, 98%, and 99%). The microphysical properties extracted were radii, volume, number and mass mix ratios as functions of RH while the optical properties were optical depth, extinction, scattering and absorption coefficients single scattering albedo, refractive indices and asymmetric parameters also at eight RHs. Using the microphysical properties, effective hygroscopic growth factors and effective radii of the mixtures were determined while using optical properties we determined the enhancement parameters, effective refractive indices and angstrom coefficients. Using the effective hygroscopic growth, we determined the dependence of the effective hygroscopicity parameter as a function of RH, while using enhancement parameters; we determined the effect of humidification factor on RH and wavelengths. The effective hygroscopic growth and enhancement parameters were then parameterized using some models to determine the effective hygroscopicity parameter, bulk hygroscopicity and humidification factors. We observed that the data fitted the models very well. The effective radii decrease with the increase in RH while the effective hygroscopic growth increases with the increase in RH, and this is in line with the increase in angstrom parameters, and this shows increase in mode size with the increase in RH. The angstrom coefficients show that the mixture has a bimodal type of distribution with the dominance of fine mode particles.
The Effect of Relative Humidity on Maritime Tropical Aerosols  [PDF]
Bello Idrith Tijjani, Fatima Sha'aibu, Aliyu Aliyu
Open Journal of Applied Sciences (OJAppS) , 2014, DOI: 10.4236/ojapps.2014.46029
Abstract: The present work focused on the effect of relative humidity (RH) on some microphysical and optical properties of maritime tropical aerosols from the software package OPAC (Optical Properties of Aerosols and Clouds) data at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (0%, 50%, 70%, 80%, 90%, 95%, 98%, and 99%). The microphysical properties extracted were radii, volume mix ratio, number mix ratio and mass mix ratio as a function of RH while the optical properties were optical depth, extinction, scattering and absorption coefficients single scattering albedo, refractive indices and asymmetric parameters. The hygroscopic growth and enhancement parameters were then parameterized by using some models to determine the hygroscopicity, bulk hygroscopicity, humidification factors and some other parameters that depend on RH and/or wavelengths. The results showed that the data fitted our models very well and can be used to extrapolate the hygroscopic growth at any RH and enhancement parameters at any RH and wavelengths. The importance of determining gfmix(RH) as a function of RH and volume fractions, mass fractions and number fractions, and enhancement parameters as a function of RH. The effective radii increases with the increase in RH, while Angstrom coefficients decrease with the increase in RH and this signifies the dominance of coarse mode particles. The angstrom coefficients show that the mixture has bimodal type of distribution and the mode size increases with the increase in RH.
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