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Search Results: 1 - 10 of 461359 matches for " Abdelhakeem A. Essa "
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Traumatic Acute Subdural Hematoma: Treatment by Evacuation with Decompressive Craniotomy and Cranioplasty, Case Series and Surgical Outcome Analysis  [PDF]
Ahmed. M. Elshanawany, Abdelhakeem A. Essa
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.83028
Abstract: Background: Acute subdural hematoma (ASDH) is considered the most common traumatic brain mass lesion. Its prognosis is still grave despite the improvements in treatment modalities. Its mortality rate was reported to be around 60% until the 1990s. In the last decade, ASDH mortality rate was reduced to the level of 20% - 40%. Standard treatment to decrease intracranial tension via hematoma evacuation is associated with decompressive craniotomy and followed by ICU management. Objective: To evaluate the outcome and prognostic factors in patients of acute subdural hematoma treated by surgical evacuation and decompressive craniotomy. Also, outcome of cranioplasty by repositioning of patients own bone or by synthetic mesh methods is evaluated. Patients and Methods: It is one year retrospective study. It was conducted on 53 patients, in trauma unit, Assiut university hospitals. We report time lag between trauma and performed surgery, initial Glasgow coma scale (GCS), age, sex and presence of other intracranial pathologies. Outcome assessment is based on Glasgow outcome scale (GOS) and fol-low-up extended for 6 months. We include those patients with only (isolated) head trauma, shift of midline more than 5 mm in CT brain. We excluded pa-tients with GCS 3 and fixed dilated pupils as well as patients with GCS higher than 12. We did decompressive craniotomy and duraplasty in all patients. Bone flap of decompressive craniotomy is situated in the abdomen. All func-tionally recovered patients were submitted for cranioplasty with either re-placing patient own bone or by Titanium mesh. Results: We had 39 males and 14 females. Age ranged between 7 and 65 years old. 23 deaths, 10 persis-tent vegetative state, 10 severe disability, 8 moderate disability and 2 good recovery. The outcome analysis was based on 6 month follow-up. Conclu-sion: Acute subdural hematoma is a very serious condition. Mortality and morbidity is intimately related to GCS on admission. Presence of associated cerebral pathology increases mortality and morbidity of patients with post-traumatic acute subdural hematoma. Early evacuation of posttraumatic acute subdural hematoma with decompressive craniotomy is an important method to control raised intracranial tension, reduce shift of midline and very benefi-cial in decreasing mortality and morbidity. Regarding infection and avoiding bone flap resorption, Titanium mesh is better than patient own bone during cranioplasty after patient recovery.
STRENGTHENING MECHANISMS AND FRACTURE BEHAVIOR OF 7072Al/Al2O3 METAL MATRIX COMPOSITES
A. CHENNAKESAVA REDDY,ESSA ZITOUN
International Journal of Engineering Science and Technology , 2011,
Abstract: The use of gravity die casting process has been studied to fabricate 7072/Al2O3 metal matrix composites. The mechanical properties have been evaluated. The composites having volume fraction of 20% alumina gave the maximum values of flexural, fracture and yield strengths. The hardness increased with the increase of alumina addition to 7072 matrix alloy. The strengthening mechanisms were largely governed by the strain hardening and by the change in grain size. The ductility decreased with the increase in volume fraction of Al2O3 in thecomposite. Clustering/agglomeration of silicon carbide particulates was observed in some of the tensile test specimens. The coarse and connected MgZn2 phases were precipitated along the grain boundaries. Mg17Al12 intermetallic phase was also revealed at the grain boundary junctions. Al7Cu2Fe were clustered in bands in the composite. The tensile fracture was governed by the ductile and brittle behaviors because of void nucleation at particle/matrix interfaces, decohesion of particles from the matrix and particle/cluster cracking.
A Survey on Semantic Similarity Measures between Concepts in Health Domain  [PDF]
Abdelhakeem M. B. Abdelrahman, Ahmad Kayed
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.52017
Abstract: The similarity between biomedical terms/concepts is a very important task for biomedical information extraction and knowledge discovery. The measures and tests are tools used to define how to measure the goodness of ontology or its resources. The semantic similarity measuring techniques can be classified into three classes: first, measuring semantic similarity using ontology/ taxonomy; second, using training corpora and information content and third, combination between them. Some of the semantic similarity measures are based on the path length between the concept nodes as well as the depth of the LCS node in the ontology tree or hierarchy, and these measures assign high similarity when the two concepts are in the lower level of the hierarchy. However, most of the semantic similarity measures can be adopted to be used in health domain (Biomedical Domain). Many experiments have been conducted to check the applicability of these measures. In this paper, we investigate to measure semantic similarity between two concepts within single ontology or multiple ontologies in UMLS Metathesaurus (MeSH, SNOMED-CT, ICD), and compare my results to human experts score by correlation coefficient.
Effect of Stocking Density on Growth Performance, Production Trait, Food Utilization and Body Composition, of Meagre (Argyrosomus regius)  [PDF]
A. Ghozlan, M. A. Zaki, M. A. Essa, M. M. Gaber, E. H. Ebiary, A. Nour
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.63B005
Abstract:
A 10-week rearing trial was conducted in cages with average initial weight of 9.15 ± 0.2 g/fish and average initial length of 9.2 ± 0.02 cm/fish of meagre, Argyrosomus regius, to examine the effect of three stocking density on growth performances, production traits, feed utilization and body composition. Nine cages 24 m3 each (4 × 6 × 1.5 m, long, width and height) were stocked with either 1200, 3600 and 6000 fish for each cage to give a stocking rate of 50, 150, and 250 fish/m3 respectively and fish fed daily, slightly in excess of satiation to eliminate the possibility of food supply being a limiting factor to growth. The results revealed that, mean final weight (g/fish), gain in weight, SGR (%per day), feed conversion ratio, protein efficiency ratio and total feed intake (g/fish) were significantly (P ≤ 0.01) influenced. The best at the lowest stocking density, while, the total production and net production exhibited significantly the opposite trend. Harvest and production estimates increased with increasing stocking density. Fish body composition% of moisture, protein, fat and ash were significantly (P ≤ 0.01) influenced by stocking density. From the above results and the economic information of the study, it can be concluded that stocking density of 50 fish/m3 of meagre exhibited the highest net profit and would seem to be the most desirable density in the system studied.
Analysis of the structural and electronic properties of 1-(5-Hydroxymethyl - 4 -[ 5 - (5-oxo-5-piperidin-1-yl-penta-1,3dienyl)-benzo[1,3]dioxol-2-yl] -tetrahydro-furan-2-yl)-5-methyl-1H-pyrimidine-2,4dione molecule
Essa, A. H.;Jalbout, A. F.;
Eclética Química , 2008, DOI: 10.1590/S0100-46702008000100010
Abstract: the structural and electronic properties of 1-(5-hydroxymethyl - 4 -[ 5 - (5-oxo-5-piperidin- 1 -yl-penta- 1,3 -dienyl)-benzo [1,3] dioxol- 2 -yl]-tetrahydro -furan-2 -yl)-5-methy l-1hpyrimidine-2,4dione (ahe) molecule have been investigated theoretically by performing density functional theory (dft), and semi empirical molecular orbital calculations. the geometry of the molecule is optimized at the level of austin model 1 (am1), and the electronic properties and relative energies of the molecules have been calculated by density functional theory in the ground state. the resultant dipole moment of the ahe molecule is about 2.6 and 2.3 debyes by am1 and dft methods respectively, this property of ahe makes it an active molecule with its environment, that is ahe molecule may interacts with its environment strongly in solution.
Comparison of the weathering behavior of a very high strength concrete with that of a standard concrete
Blandine, A.;Essa?d, B.;Bernard, G.;
Ceramica , 2008, DOI: 10.1590/S0366-69132008000400002
Abstract: we studied the weathering process of a very high strength concrete (vhsc) and compared it with that of a usual concrete. vhsc has compressive strengths much above 100 mpa after seven days of curing. the compressive strength is increased by lowering the value of the water/cement ratio and by improving the particle size distribution of the numerous residual anhydrous grains of clinker and of the quartz aggregates. a proportion of 15% of the cement is replaced by non-condensed silica fume, which consists of spherical particles of amorphous silica, 0.1 μm in diameter. this has the advantage to fill the space between clinker particles. another advantage is to densify the interfacial zone between cement paste and aggregates. afters 28 days of curing, the vhsc samples consist of quartz aggregates and residual anhydrous clinker particles linked to each other with a paste mainly composed of calcium silicate hydrate (c-s-h). samples of vhsc were immersed in continuously renewed distilled water under inert atmosphere. after two months of exposure, chemical, mineralogical and textural changes have occurred in a superficial zone. the depth of the degraded zone is 300 μm. this value is much lower than the depth of the degraded zone formed in an usual mortar (800 μm) or in a common paste (1500 μm) leached in the same condition. at the surface of the weathered samples of vhsc, the anhydrous clinker particles have dissolved and the resulting holes of 10 μm diameter remained empty. at the frontier between the safe core and the weathered superficial zone, the holes resulting from the dissolution of clinker particles were filled with secondary c-s-h. as a conclusion, the low porosity of vhsc is a benefit for the compressive strength but also for the durability. the presence of numerous anhydrous clinker particles is not a problem.
Use of thermodynamic chemical potential diagrams (μCaO, μCO2) to understand the weathering of cement by a slightly carbonated water
Blandine, A.;Bernard, G.;Essa?d, B.;
Ceramica , 2008, DOI: 10.1590/S0366-69132008000300014
Abstract: cement is a ubiquitous material that may suffer hazardous weathering. the chemical weathering of cement in natural environment is mostly characterized by the leaching of cao and the addition of co2. the different weathering zones that develop at the expense of the cement may be predicted by the help of chemical potential phase diagrams; these diagrams simulate the behaviour of systems open to some chemical elements. some components have a so-called inert status, that is to say the system is closed for these components, their amount in the system remains constant; some other components have a mobile status, that is to say these components can be exchanged with the outside of the system, their amount can vary from one sample zone to another. the mobile components are represented in the model by their chemical potentials (linked to their concentrations) that are variable in the external environment. the main features of the weathering of a cement system open to cao and co2 are predicted in a phase diagram with μcao et μco2 as diagram axes. from core to rim, one observes the disappearance of portlandite, ettringite and calcium monosulfoaluminate, the precipitation of calcite and amorphous silica, the modification of the composition of the csh minerals (hydrated calcium silicates) that see a decrease of their c/s ratio (cao/sio2) from the core to the rim of the sample. for the csh minerals, we have separated their continuous solid solution into three compositions defined by different cao/sio2 ratios and called phases 1, 2 and 3: cao = 0.8, 1.1, 1.8 respectively for one mole of sio2 knowing that h2o varies in the three compositions.
Survey Study of Acute and Long Term Effects of Female Genital Mutilation among Women in Sharkia Governorate  [PDF]
Essa M. Arafa, Amany M. Abdelghany, Nadia M. Madkour, Wael S. Nossair, Ekramy A. Mohamed
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.414123
Abstract: Objective: The aim of this study is to evaluate the acute and long-term effects of female genital mutilation (FGM) among women in Sharkia Governorate. Method: This was a cross-sectional descriptive study carried out in Zagazic University Hospital (ZUH) over a two years period from January 2012 to January 2014. The overall sample consisted of 1500 women. An interview was utilized to collect the necessary data. The questionnaires were administered face to face, in Arabic language. Four open and 25 close-ended questions were used to collect socio-demographic data of the sample: women’s experience about the circumcision, occurrence of health hazards after circumcision, and sexual effects on married women. Intention of all women (circumcised or not) to circumcise their daughters was also documented. Results: This study revealed that the prevalence of FGM in Sharkia Governorate was about 85.5%. The majority of circumcised women were Muslims (94.4%), married (87.9%), housewife (81.4%), illiterate or with low education level (45.5% and 38.5% respectively) and from rural areas (82.2%). The most common types of FGM were type I (49.2%) and type II (50.8%). The most common motive of FGM was the religious cause (46.6%). The majority of circumcised women (59%) denied the occurrence of any acute complication. The reported acute complications in this study were bleeding (19.6%), urine retention (2.3%), infection (6.3%) and difficult walking (12.8%). The majority of circumcised women (86%) denied the occurrence of any problems at labor related to circumcision. The reported problems at labor in this study were narrowing of introitus (8.4%), laceration (0.7%) and bleeding (4.9%). In this study, 74.6% of circumcised women believed that there was no effect of circumcision on their sexual satisfaction and 92.1% of circumcised women believed that there was no effect of circumcision on their husband’s sexual satisfaction. Approximately 16% of circumcised women complained of dyspareunia and believed that it was related to circumcision. Conclusion: Female circumcision is deeply rooted in our community and laws alone will not eradicate it. Moreover, this approach may drive it underground. Increased media coverage, statements by ministers, religious leaders
Correlation between Perifollicular Vascularity and Outcome in Stimulated Intrauterine Insemination Treatment Cycles: A Study Using Two-Dimensional Transvaginal Power Doppler Ultrasound  [PDF]
Nadia M. Madkour, Wael S. Nossair, Essa M. Arafa, Amany M. Abdelghany, Ekramy A. Mohamed, Walid A. Abdelsalam
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.415137
Abstract: Objective: The aim of this study is to assess any potential relationship between perifollicular vascularity and occurrence of pregnancy in cases of stimulated IUI cycles using the subjective grading system by 2D transvaginal power Doppler ultrasonography. Design: A prospective cross sectional cohort study. Method: This is a prospective cross-sectional cohort study of 90 stimulated IUI treatment cycles. Selected women were prescribed clomiphene citrate combined with highly purified urinary follicle stimulating hormone. All patients underwent serial transvaginal ultrasound scans starting from day 6 to 7 of the cycle. Perifollicular Doppler blood flows were assessed in dominant follicles ≥18 mm. The patients then were categorized into 3 groups (high vascularity group {G3 & G4}, low vascularity group {G1 & G2} and mixed grades group). Other parameters measured included number of follicles ≥ 18 mm in both ovaries, endometrial thickness and estradiol (E2) level . Human chorionic gonadotropin (hCG) injection 10,000 IU IM was given to the patient when the dominant follicle reached 18 mm in diameter. At that time, the endometrium was evaluated as regards endometrial thickness. IUI was carried out using prepared/“washed” semen (husband). All patients received luteal support in the form of progesterone from day of IUI for 14 days. Serum Β-hCG was estimated 2 weeks after insemination. Results: In this study, from all 90 cases only 8 cases got pregnant with pregnancy rate of 8.88% (6 cases got pregnant in high grade vascularity group; 2 cases in mixed grades group and no cases got pregnant in low grade group). There was statistically significant difference among the 3 groups as regarding the pregnancy rate (P value = 0.02). There is statistically significant difference in perifollicular resistance index (RI) and pulsatility index (PI) between pregnant and non pregnant cases (P value = 0.016 and 0.047 respectively). In this study, there is no statistically significant difference between pregnant and non pregnant cases as regarding endometrial thickness and E2 level at the day of hCG administration (P value = 0.39 and 0.76 respectively). Conclusion: Perifollicular blood-flow assessment by 2D transvaginal power Doppler is a good predictive for the outcome of stimulated IUI cycles.
The Influence of Eddy Diffusivity Variation on the Atmospheric Diffusion Equation  [PDF]
A. A. Marrouf, Khaled S. M. Essa, Maha S. El-Otaify, Adel S. Mohamed, Galal Ismail
Open Journal of Air Pollution (OJAP) , 2015, DOI: 10.4236/ojap.2015.43011
Abstract: The advection diffusion equation was solved analytically using separation of variables technique, considering first the wind speed and eddy diffusivity as constants; second as variables dependent on vertical height z. Comparison between predicted two models and observed concentration on Inshas, Cairo (Egypt) is done.
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