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Search Results: 1 - 10 of 139359 matches for " Hamza K. Ija "
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Wildebeest (Connochaetes taurinus) Population Densities and Distribution in Dry and Wet Season in the Kilimanjaro Landscape  [PDF]
Noah Sitati, Kenana Lekishon, Samuel Bakari, Fiesta Warinwa, Stephen Ndambuki Mwiu, Nathan Gichohi, Elphas Bitok, Machoke Mwita, Hamza K. Ija, Joseph Mukeka
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.513070
Abstract: The conservation of migratory wildlife species in the savannah habitat can be a challenge because of frequent and prolonged drought and their requirements for a large area. We investigated the performance of the wildebeest (Connochaetes taurinus) population in the 25,624 km2 Kilimanjaro landscape of Kenya and Tanzania, which comprises Amboseli-West Kilimanjaro-Magadi-Natron after 2009 drought. We used total aerial counts to determine the spatial distribution and numbers of wildebeests during wet and dry season in 2010 and 2013. Global Positioning System and digital voice recorders were used to count wildebeests along established transects within blocks. There was an increase in the wildebeest population by 103% during the wet season and 14% during the dry season between 2010 and 2013. The seasonal variation in density occurred between the four counting blocks with Natron and Magadi areas recording the highest densities. Generally, the increase in population could be attributed to the recovery of the population after the 2009 drought. The current cross border collaboration between Kenya and Tanzania in aerial surveys is an important step in the conservation of this migratory species in the landscape. This study demonstrates that detailed knowledge of density and spatial distribution of migratory species is required to plan effective conservation action.
Influence of Carbohydrates, Mineral Nutrients and Plant Hormones in Alternate Bearing of Black Pepper (Piper nigrum L.)  [PDF]
K. S. Krishnamurthy, S. J. Ankegowda, V. Srinivasan, S. Hamza
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410243

Alternate bearing habit, a common phenomenon prevalent in some of the fruit trees is observed in black pepper variety Panniyur-1 also. In this study, an attempt was made to investigate the role of carbohydrates, mineral nutrients and plant hormones (IAA and zeatin riboside) in alternate bearing in Panniyur-1 variety. The experiment was conducted for three consecutive years at Murugarajendra estate, Madikeri, Karnataka, India (12.42N, 75.73E). Carbohydrate, mineral nutrient and plant hormone (IAA and zeatin riboside) statuses of the leaves as well as fruiting branches (stem) were compared between good fruiting year (on year) and low fruiting year (off year). Results revealed that concentration of mineral nutrients in leaves was more during on year compared to off year while the reverse was true on the stem. Both stem and leaf metabolite levels at harvest were higher in off year compared to on year suggesting that remobilization of nutrients to the developing berries must have been affected during off year, thus leading to accumulation of more nutrients at harvest in off year compared to on year. Leaf had higher concentration of most of mineral nutrients compared to stem. Spraying of 1% solution of complex fertilizer 19:19:19 (percent N:P:K) three times at an interval of 3 weeks from flower primordial initiation to flowering period enhanced the yield to the extent of around 30% during off year. Auxin to cytokinin ratio was 6.6 and 6.1 in on year and 6.3 and 5.7 in off year at flowering and 3 months after flowering respectively, suggesting that this ratio itself may not play a major role in flowering during on and off years, though the ratio was slightly more during on year. Results of the study indicate that efficient utilization of metabolites and nutrients in on year may render vine weak in the subsequent year coupled with poor remobilization into developing berries, which could make it an off

Historical Argumentation and Writing Historical Historical Argumentation and Writing Historical
Hamza KELE?,Ayten K?R??
Journal of Kirsehir Education Faculty , 2010,
Abstract: Writing a historical essay in argumentative genre is an important activity in learning and understanding the history. Argumentation is the symbol of good writing. In historical argumentation, what is expected from students is not to put the events into a chronologicalorder but to put a claim and then give a detailed discussion of the their claim based on evidence. In the present study, based on Toulmin’s argumentation model, general argumentation and historical argumentation are dealt with and features and importance of writing historical argumentation in history courses are emphasized. Moreover, sample activities that can be used to encourage students to write historical argumentation texts and evaluation criteria for a historical text in argumentative genre are presented.
On Solutions of First Order Stochastic Partial Differential Equations
K. Hamza,F. C. Klebaner
Mathematics , 2005,
Abstract: This note is concerned with an important for modelling question of existence of solutions of stochastic partial differential equations as proper stochastic processes, rather than processes in the generalized sense. We consider a first order stochastic partial differential equations of the form $\pd Ut = DW$, and $\pd Ut-\pd Ux= DW$, where $D$ is a differential operator and $W(t,x)$ is a continuous but non-differentiable function (field). We give a necessary and sufficient condition for stochastic equations to have solutions as functions. The result is then applied to the equation for a yield curve. Proofs are based on probability arguments.
On nonexistence of non-constant volatility in the Black-Scholes formula
K. Hamza,F. C. Klebaner
Mathematics , 2005,
Abstract: We prove that if the Black-Scholes formula holds with the spot volatility for call options with all strikes, then the volatility parameter is constant. The proof relies some result on semimartingales (Theorem 2) of independent interest.
Some Properties of the -Extension of the -Adic Gamma Function
Hamza Menken,Adviye K?rük?ü
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/176470
A Hybrid ANN-GWO Algorithm for Prediction of Heart Disease  [PDF]
Hamza Turabieh
American Journal of Operations Research (AJOR) , 2016, DOI: 10.4236/ajor.2016.62016
Abstract: The paper investigates the powerful of hybridizing two computational intelligence methods viz., Gray Wolf Optimization (GWO) and Artificial Neural Networks (ANN) for prediction of heart disease. Gray wolf optimization is a global search method while gradient-based back propagation method is a local search one. The proposed algorithm implies the ability of ANN to find a relationship between the input and the output variables while the stochastic search ability of GWO is used for finding the initial optimal weights and biases of the ANN to reduce the probability of ANN getting stuck at local minima and slowly converging to global optimum. For evaluation purpose, the performance of hybrid model (ANN-GWO) was compared with standard back-propagation neural network (BPNN) using Root Mean Square Error (RMSE). The results demonstrate that the proposed model increases the convergence speed and the accuracy of prediction.
Patterns of diabetic complications at Jimma University Specialized Hospital, Southwest Ethiopia
D Worku, L Hamza, K Woldemichael
Ethiopian Journal of Health Sciences , 2010,
Abstract: Background: Diabetes Mellitus is common metabolic disease worldwide. Its complications in the Ethiopian care setup has not been well documented. The objective of this study was to assess the pattern and distribution of dia-betic complications among patients having follow-up at Jimma University specialized Hospital diabetic clinic. Methods: A cross sectional study based on record review of 305 patients, selected using systematic sampling with replacement was carried out in October 2008. The data were analyzed using SPSS for Windows version 13.0. Results: Larger proportion, 189 (62.0%), of patients had type II diabetes and 163 (53.4%) of them were diabetic for less than 5 years. Seventy three of the 76 (96.1%) patients with type II diabetes mellitus had hypertension. Acute complications were observed in 93 (30.5%) of the patients of which Diabetic Ketoacidosis was documented in 66(71.0%). Forty eight (45.7%) of patients had proteinuria, 90 (29.5%) had peripheral neuropathy, 13(6.8%) had impotence. Diabetic foot ulcer, skin and/or subcutaneous tissue infection, dental problems and tuberculosis were documented in 14(4.5%), 31(10.0%), 31(10.0%), and 17(5.6%) patients, respectively. Any of the chronic complications were not different by sex of the patient but age had statistically significant association with hypertension, visual distur-bance and neuropathy (p< 0.05). Type of diabetes had statistically significant association with all the tested com-plications except infection (P<0.05) where most of the complications occurred in type II diabetics. Statistically significant association was observed between the duration of the diabetes and impotence and visual disturbances (p < 0.05). Conclusion: The majority of patients were type II diabetics. Acute complications were observed more commonly among type I diabetics and DKA was the commonest acute complication. The frequency of chronic complications was high. Increased occurrence of retinopathy, peripheral neuropathy, hypertension and nephropathy was ob-served with longer duration of illness. Impotence and diabetic nephropathy were more common in type II diabet-ics. The study showed that age, sex, type of diabetes mellitus and duration of diabetes were significantly associated with the development of diabetic complications.
A Study on the spermatological characteristics of hatchery-reared flounder (Platichthys flesus luscus Pallas, 1814)
?lhan Ayd?n,Temel ?ahin,Hamza Polat,Ercan Kü?ük
Journal of FisheriesSciences.com , 2011,
Abstract: This study was carried out to determine the spermatological characteristics in flounder (Plat-ichthys flesus luscus Pallas, 1814). In the spawning season, semen was collected by abdominal massage from 10 male. In collected milts; volume, motility, duration of motility, spermatocrit ratio, concentration and pH were determined. Furthermore, body weight and total length were measured and correlations between spermatological characteristics and these parameters were investigated. In the semen of flounder, milt volume (ml), motility (%), duration of motility (min), spermatocrit ratio, concentration (x 109 /ml), and pH values were found as mean 0.2 ± 0.04, 88.0 ± 13.80, 25.4 ± 4.20, 92.6 ± 4.3, 2.8 ± 0.72 ve 6.9 ± 0.10, respectively. It was found that there were positive correlations between body weigth and total length, and volum (P < 0.01), but negatif correlation between total length and duation of motility (P < 0.05), and be-tweem density and spermatocrit (P < 0.05).
High Accuracy Time of Flight Measurement Using Digital Signal Processing Techniques for Subsea Applications  [PDF]
Muhammad Ashraf, Hamza Qayyum
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.24047
Abstract: The techniques widely used in ultrasonic measurements are based on the determination of the time of flight (T.o.F). A short train of waves is transmitted and same transducer is used for reception of the reflected signal for the pulse-echo measurement applications. The amplitude of the received waveform is an envelope which starts from zero reaches to a peak and then dies out. The echoes are mostly detected by simple threshold crossing technique, which is also cause of error. In this paper digital signal processing is used to calculate the time delay in reception i.e. T.o.F, for which a maximum similarity between the reference and the delayed echo signals is obtained. To observe the effect of phase uncertainties and frequency shifts (Doppler), this processing is carried out, both directly on the actual wave shape and after extracting the envelopes of the reference and delayed echo signals. Several digital signal processing algorithms are considered and the effects of different factors such as sampling rate, resolution of digitization and S/N ratio are analyzed. Result show accuracy, computing time and cost for different techniques.
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