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Search Results: 1 - 10 of 589528 matches for " N. A. IBRAHIM "
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Bootstrap Confidence Interval for the Median Failure Time of Three-Parameter Weibull Distribution
N. A. Ibrahim,A. Kudus
Lecture Notes in Engineering and Computer Science , 2007,
Abstract:
Effects of Transplanting Dates and Insecticide Frequency in the Control of Thrips tabaci Lindeman (Thysanoptera:Thripidae) on Onion (Allium cepa L.) in Sokoto, Nigeria
N. D. Ibrahim,A. A. Adesiyun
Journal of Agricultural Science , 2010, DOI: 10.5539/jas.v2n2p239
Abstract: Two factors, transplanting date and insecticide frequency were combined to evaluate their effects in reducing population of thrips and yield of onion. Transplanting was done at monthly interval from November through March, while spraying was done fortnightly, starting from three weeks after transplanting (WAT) to nine WAT (3, 5, 7 and 9) using knapsack sprayer at 18.67g a.i./ha. Results showed that early transplanting done in November and December had fewer thrips than the subsequent ones. At 7 WAT, late transplanting made in February had up to 191 thrips/plant and< 1 in the early transplants. First spray was effective in reducing thrips by about 76% and second and subsequent sprays were less effective. There was significant difference between treatments (P<0.05) in spray at 4, 6, 7, 9 and 10 WAT and the bulb yield of onion. The yield showed that two sprays produced up to 52.53 t/ha, nearly doubling the control plots with 31.6 t/ha. November transplant produced up to 60 t/ha and December transplant 51.82t/ha in three-insecticide spray. The average weight of bulbs from plots with 2 sprays and control plots were 238 g and 155 g, respectively.
Seasonal Abundance of Onion thrips, Thrips Tabaci Lindeman. in Sokoto, Nigeria
Ibrahim N. D,Adesiyun A. A.
Journal of Agricultural Science , 2010, DOI: 10.5539/jas.v2n1p107
Abstract: Onion seedlings were transplanted from November to March to study the population dynamics of onion thrips, Thrips tabaci. There are four transplants in 2001/2002 and five in 2002/2003 seasons. In 2000/2001 season onion plants were grown in exploratory trials and in 2003/2004, water traps were used to confirm results of the previous experiments. Results indicate that November transplant had a peak population of onion thrips in late February (176 thrips/plant); December (416 thrips/plant) and January (608 thrips/plant) transplants peaked in March, and February (148 thrips/plant) and March (86) transplants had peaks in April. Water traps indicate that the peak population of adult thrips was at the time of harvest in April, similar to November transplant. The early transplant (November) had peak thrips population at maturity and middle transplant recorded the peak population middle of the season and late transplant had their peaks early part of the growing season. Therefore, the findings of this work revealed that onion thrips in Sokoto, Nigeria, breed from January to May with peak in March.
Analysis of Electrical Characteristics of Photovoltaic Single Crystal Silicon Solar Cells at Outdoor Measurements  [PDF]
A. Ibrahim
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.22020
Abstract: The electrical performance of a photovoltaic (PV) silicon solar cell is described by its current–voltage (I–V) character-istic curve, which is in turn determined by device and material properties. In this study, an investigation of the performance and device parameters of photovoltaic single crystalline silicon (Si.) solar cell of the construction n+pp++ PESC(Passivatted Emitter Solar Cell) at different conditions of solar irradiance, title angle and mirror boosting effects had been studied. Also the paper reports on the performance data of the Si. cell, using standard I–V characteristic curves to obtain output parameters and to show that there are possible performance degrading defects presents.
Optimizing the Preparation Conditions of Bi-2223 Superconducting Phase Using PbO and PbO2  [PDF]
N. H. Mohammed, Ramadan Awad, A. I. Abou-Aly, I. H. Ibrahim, M. S. Hassan
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.34033
Abstract: In this work, superconducting samples of type (Bi1.8Pb0.4)Sr1.9Ca2.1Cu3O10+δ were prepared, with Pb0.4 composed of Pb0.2 2+ and Pb0.24+ , at different sintering temperatures ranging from 835℃to 855℃. The prepared samples were characterized using x-ray powder diffraction (XRD), scanning electron microscope (SEM), electron dispersive spectroscopy (EDS) and differential scanning calorimetery (DSC). The superconducting properties were investigated using electrical resistivity and transport critical current density. Our results showed that the sample prepared at sintering temperature 845?C has the optimum value of superconducting transition temperature Tc and transport critical current density Jc.
Assessment of the Quality of Composite Resin Restorations  [PDF]
Z. A. Ijaimi, N. H. Abu-Bakr, Y. E. Ibrahim
Open Journal of Stomatology (OJST) , 2015, DOI: 10.4236/ojst.2015.52004
Abstract: Purpose: To evaluate the quality of the composite restorations. Material and Methods: A total of 246 composite restorations in 125 patients attending the Conservative Dentistry Clinics at the Faculty of Dentistry, University of Khartoum were examined. Both anterior and posterior composite restorations were included. California Dental Association Quality Evaluation System was used for the evaluation. Results: Fifty two percent of all restorations were found to be satisfactory, while the remaining 48% were not satisfactory. With regard to surface and colour criteria, colour mismatch within the range (34.8%) and slight surface roughness (26.6%) were the most common defects. The most frequent defects of the anatomical form were restoration overhang (26.8%). The majority of the restorations above 4 years old were of unacceptable anatomical form (66.7%), and their marginal integrity was less acceptable than more recent restorations (46.7%). Conclusions: Forty eight percent of the examined composite restorations needed to be replaced, and the unacceptable anatomic form was the main cause of failure of composite restorations.
Clinical Characteristics of Headache in Egyptian Patients with Idiopathic Epilepsy  [PDF]
Mohamed A. Sayed, Hazem K. Ibrahim, Alaaeldin Sedky Bekhit, Mohamed N. Thabit, Mostafa Abdelmomen
Journal of Behavioral and Brain Science (JBBS) , 2019, DOI: 10.4236/jbbs.2019.93012
Abstract: Purpose: Headache and epilepsy are common neurological disorders and their relationship is still incompletely known. The purpose of our work was to estimate the most common types of primary headache syndromes and its relation to seizure timing in epileptic patients in Upper Egypt. Patients & Methods: In a cross-sectional study, we evaluated headaches in 100 consecutive patients with idiopathic epilepsy attending the neurology outpatient clinic and the epilepsy clinic at Sohag university hospital by complete medical history, physical and neurologic examination EEG and CT brain. Results: Of our study population, 78% of patients with epilepsy reported headaches. Migraine occurred in 70.6% of patients with headache followed by tension-type headache in 25.58% of patients and other types of headaches occurred in 2.56% of patients. There were 8 patients (10.1%) had a pre-ictal headache, 52 patients (66.5%) had a postictal headache and 39 patients (50%) had an interictal headache. In our study, we found that the occurrence of headache being linked to the female sex, lower mean age, lower mean age at the onset of epilepsy, focal epilepsy, longer duration of epilepsy, high frequency of seizures and the use of polytherapy of antiepileptics. Conclusion: Headache especially migraine is an important comorbidity of epilepsy and should receive more attention especially in female patients, patients with younger age, lower mean age at epilepsy onset, longer duration of the disease, patients on polytherapy, patients with higher frequency of seizures and patients with focal epilepsy.
Posttransplant Lymphoproliferative Disorders
Hazem A. H. Ibrahim,Kikkeri N. Naresh
Advances in Hematology , 2012, DOI: 10.1155/2012/230173
Abstract: Posttransplant lymphoproliferative disorders (PTLDs) are a group of diseases that range from benign polyclonal to malignant monoclonal lymphoid proliferations. They arise secondary to treatment with immunosuppressive drugs given to prevent transplant rejection. Three main pathologic subsets/stages of evolution are recognised: early, polymorphic, and monomorphic lesions. The pathogenesis of PTLDs seems to be multifactorial. Among possible infective aetiologies, the role of EBV has been studied in depth, and the virus is thought to play a central role in driving the proliferation of EBV-infected B cells that leads to subsequent development of the lymphoproliferative disorder. It is apparent, however, that EBV is not solely responsible for the “neoplastic” state. Accumulated genetic alterations of oncogenes and tumour suppressor genes (deletions, mutations, rearrangements, and amplifications) and epigenetic changes (aberrant hypermethylation) that involve tumour suppressor genes are integral to the pathogenesis. Antigenic stimulation also plays an evident role in the pathogenesis of PTLDs. Plasmacytoid dendritic cells (PDCs) that are critical to fight viral infections have been thought to play a pathogenetically relevant role in PTLDs. Furthermore, regulatory T cells (Treg cells), which are modulators of immune reactions once incited, seem to have an important role in PTLDs where antigenic stimulation is key for the pathogenesis. 1. Introduction Post-transplant lymphoproliferative disorders (PTLDs) are a group of diseases that range from benign polyclonal to malignant monoclonal lymphoid proliferations. They develop as a consequence of immunosuppression. PTLDs are characterised by the following: they are usually derived from B cells with preferential presentation as non-Hodgkin’s lymphoma (as against Hodgkin’s lymphoma), usually originate in extranodal sites, rarely affect skin, behave aggressively, and frequently harbour the Epstein-Barr virus (EBV) genome. Whilst most are high-grade B-cell non-Hodgkin’s lymphoma (NHLs), a few are classical Hodgkin’s lymphomas. Rare cases have also been shown to be either of T-cell or NK-cell lineages [1, 2]. T-cell neoplasms constitute 10% to 15% of all PTLDs, and about 75% of T-cell PTLDs, have been shown to be negative for EBV and to behave more aggressively. T-PTLDs usually develop later than B-PTLDs and patients are less likely to respond to reduction in immunosuppression [3, 4]. The abnormal B cells in solid organ transplant recipients originate usually from those of the recipient, while in recipients of bone marrow
Synthesis, Characterization and Use of Schiff Bases as Fluorimetric Analytical Reagents
Mohamed N. Ibrahim,Salah E. A. Sharif
Journal of Chemistry , 2007, DOI: 10.1155/2007/191805
Abstract:
Synthesis, Characterization and Use of Schiff Bases as Fluorimetric Analytical Reagents (Part II)
Mohamed N. Ibrahim,Salaheddin A. I. Sharif
Journal of Chemistry , 2011, DOI: 10.1155/2011/821616
Abstract:
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