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OALib Journal期刊

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Secondary Bithalamic Ischemic Vascular Accident Has an Occlusion of the Artery of Percheron  [PDF]
Jennifer Nyangui Mapaga, Ibrahima A?ssata Camara, Grass Aurelle Mambila Matsalou, Pupchen Marilyse Gnigone, Nelly Diouf Mbourou, Annick Nsounda Mandzela, Cherif Mohamadou Aidara, Kouna Ndouongo Philomène
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105169
Abstract:
The bithalamic ischemic stroke secondary to percheron artery occlusion occupies a small place in the large ischemic stroke family, but its clinical polymorphism arouses patrician curiosity. We thus report 3 observations that explain the richness of this affection.
Post-Stroke Depression at Teaching Hospital Center of Libreville  [PDF]
I. A. Camara, C. M. Coulibaly, N. Diouf Mbourou, P. M. Gnigone, G. A. G. Mambila Matsalou, A. Nsounda Mandzela, L. Oura, J. Nyangui Mapaga, U. D. Kombila, M. M. Moubecka, P. N. Kouna
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1105049
Abstract:
Introduction: Post-stroke depression occurs in a context of stroke characterized by sadness, loss of interest, feelings of guilt, loss of appetite, a feeling of tiredness, and a lack of concentration. Material and Methods: We conducted a descriptive cross-sectional study from January 1, 2013 to September 30, 2016. For the diagnosis of post-stroke depression, neuropsychological tests (DSM-IV and MADRS) were used. The collection approach was a maintenance survey followed by an examination. Results: From 153 stroke patients, 48.4% (n = 74) had post-stroke depression. Depressed mood was noted in 50.3% and 43.8% had a marked decrease in interest. 67.9% of these patients had a primary level of education. Widows had 4.2 times the risk of post-stroke depression, and married and retired patients were 3 times more likely than public servants. The occurrence of post-stroke depression was significantly related to the presence of motor deficit in our patients, p < 0.0001. Conclusion: These results suggest that the risk of developing depression after stroke increases with the motor deficit. The DSM-IV and MADRS scores remain neuropsychological examinations of choice for the diagnostic approach.
Prevalence and Associated Factors of Cephales in a Professional Environment—Case of Teachers of Libreville  [PDF]
Ibrahima Aissata Camara, Maёl Ndao Eteno, Annick Nsounda Mandzela, Nelly Diouf Mbourou, Grass Aurelle Mambila Matsalou, Jennifer Nyangui Mapaga, Pupchen Marilyse Gnigone, Landry Oura, Mounguengui Martine Moubecka, Philomène Kouna
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105168
Abstract:
Objective: To determine the prevalence of headaches among Libreville teachers. Introduction: Headaches, commonly referred to as “headaches”, correspond to all the unpleasant sensations felt in the head. It is generally a question of subjective manifestations that only the patient can express. The most common functional sign is pain, which in itself is difficult to measure. Methodology: This is a cross-sectional prospective study with analytical and descriptive aims, which took place over a period of 4 months from February 1st to June 1st, 2016. It took place in five public secondary schools in two of the six districts of Libreville. Was considered cephalalgic (or suffering from headache), any teacher who answered “Yes” to the question: “Are you prone to headaches?” The choice of the reference interval to be able to evaluate the working time of the recruited teachers was inspired by the European standards which globally place the average weekly working time of teachers between 30 and 40 hours. The collected data were processed and analyzed with Epi-info 7 and SPSS 22 software. A regression analysis was performed to identify the associated factors. Results: We collected 236 teachers whose average age was 43.2 ± 7.9 years, with extremes of 27 and 60 years. There were 141 men (59.7%) and 95 women (40.3%) with a sex ratio of 0.96. The prevalence of headache was 76.7%. The factors associated with headaches were the subject taught, the number of students, and the provision of private tutoring. Five main triggers were found: overwork (86.2%), lack of sleep (84.5%), sun (73.5%), noise (68%) and fatigue (64.6%). The effects of headache were discomfort in daily activities (65.7%), absenteeism (35.9%) and a reduction in sleep time. Conclusion: Our study shows that headaches particularly affect the teaching profession with female predominance due to stressful situations caused by their work environment.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Determining the Basaltic Sequence Using Seismic Reflection and Resistivity Methods  [PDF]
A. Alanezi, A. Qadrouh
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B004
Abstract:

This study was carried out in Harat Rahat (south of Almadinah Almonwarah) using seismic reflection and resistivity methods. The main objectives of this study are to determine the extent of the basaltic layer and to define the subsurface faults and fractures that could affect and control the groundwater movement in the study area. A 2D seismic profile was acquired and the result shows that the subsurface in the study area has a major fault. We obtained a well match when the seismic result was compared with drilled wells. As a complementary tool, the resistivity method was applied in order to detect the groundwater level. The results of the resistivity method showed that six distinct layers have been identified. The interpretation of these six layers show that the first three layers, the fourth layer, the fifth layer and the bottom of the section indicated various subsurface structures and lithologies; various basaltic layers, fractured basalt, weathered basement and fresh basaltic layers, respectively. It is obvious that the eventual success of geophysical surveys depend on the combination with other subsurface data sources in order to produce accurate maps.

Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution  [PDF]
S. A. A. Sajadi
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2014, DOI: 10.4236/ojinm.2014.41001
Abstract:

The acidity and stability constants of M(Gly)1, M(Ttr)1, and M(Trp)1 M: Cu2+, Cu(Bpy2)2+, and Cu(Phen3)2+ complexes, were determined by potentiometric pH titration. It is shown that the stability of the binary Cu(L), (L: Gly, Ttr, and Trp) complex is determined by the basicity of the carboxylate group on one side and amino group on the other side. It is demonstrated that the equilibrium, Cu(Ha4)2+ + Cu(L) \"\"Cu(Har)(L) + Cu2+, is displacement due to the well known experience that mixed ligand complexes formed by a divalent 3d ion, a heteroaromatic N base and an O donor ligand possess increased stability. The stability constants of the 1:1 complexes formed between Cu2+, Cu(Bpy)2+ or Cu(Phen)2+

Adaptive Fuzzy Sliding Mode Controller for Grid Interface Ocean Wave Energy Conversion  [PDF]
Adel A. A. Elgammal
Journal of Intelligent Learning Systems and Applications (JILSA) , 2014, DOI: 10.4236/jilsa.2014.62006
Abstract:

This paper presents a closed-loop vector control structure based on adaptive Fuzzy Logic Sliding Mode Controller (FL-SMC) for a grid-connected Wave Energy Conversion System (WECS) driven Self-Excited Induction Generator (SEIG). The aim of the developed control method is to automatically tune and optimize the scaling factors and the membership functions of the Fuzzy Logic Controllers (FLC) using Multi-Objective Genetic Algorithms (MOGA) and Multi-Objective Particle Swarm Optimization (MOPSO). Two Pulse Width Modulated voltage source PWM converters with a carrier-based Sinusoidal PWM modulation for both Generator- and Grid-side converters have been connected back to back between the generator terminals and utility grid via common DC link. The indirect vector control scheme is implemented to maintain balance between generated power and power supplied to the grid and maintain the terminal voltage of the generator and the DC bus voltage constant for variable rotor speed and load. Simulation study has been carried out using the MATLAB/Simulink environment to verify the robustness of the power electronics converters and the effectiveness of proposed control method under steady state and transient conditions and also machine parameters mismatches. The proposed control scheme has improved the voltage regulation and the transient performance of the wave energy scheme over a wide range of operating conditions.

Geochemical Characteristics and Chemical Electron Microprobe U-Pb-Th Dating of Pitchblende Mineralization from Gabal Gattar Younger Granite, North Eastern Desert, Egypt  [PDF]
Hassan A. A. Shahin
Open Journal of Geology (OJG) , 2014, DOI: 10.4236/ojg.2014.41003
Abstract:

Pitchblende mineralization was studied in the younger granite samples collected from Gabal Gattar, north Eastern Desert, Egypt using electron scanning microscope (ESM) and electron probe microanalyses (EPMA). This study revealed that this pitchblende contains significant Zr content reaching up to (66.80% ZrO2), which suggests that volcanic rocks were probably the source of such a deposit. High level emplaced high-K Calc-alkaline plutons as Qattar granite may have been associated with their volcanic equivalent emplaced in the surrounding area or now eroded. Lead content of the pitchblende mineralization is high and with moderate volcanics (up to 7.71% PbO). In contrast, it is low in ThO2, Y2O3 and REE2O3. High Zr and Pb content associated with pitchblende mineralization from Gattar granite indicates

A Comparative Study of Adomain Decompostion Method and He-Laplace Method  [PDF]
Badradeen A. A. Adam
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.521312
Abstract: In this paper, we present a comparative study between the He-Laplace and Adomain decomposition method. The study outlines the significant features of two methods. We use the two methods to solve the nonlinear Ordinary and Partial differential equations. Laplace transformation with the homotopy method is called He-Laplace method. A comparison is made among Adomain decomposition method and He-Laplace. It is shown that, in He-Laplace method, the nonlinear terms of differential equation can be easy handled by the use He’s polynomials and provides better results.
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