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Friction 2020年第5期8卷 905-916页

作者： mohamed Kamal ahmed ali Xianjun HOU mohamed AAABDELKAREEM Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Automotive and Tractors Engineering Department Faculty of EngineeringMinia UniversityEl-Minia 61111Egypt Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were com-prehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%–30% and 26.5%–32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.

关键词： engine tribology nanomaterial nanolubricant friction wear tribofilm

Primary gastroduodenal tuberculosis presenting as gastric outlet obstruction:A case report and review of literature

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World Journal of Clinical Cases 2024年第8期12卷 1536-1543页

作者： Abdihamid mohamed ali Yahye Garad mohamed Abdirahman ahmed Mohamud Abdulkadir Nor mohamed mohamed Rage ahmed Ismail Mohamud Abdullahi Tuba Saydam Department of General Surgery Mogadishu Somali Turkey Recep Tayyip Erdogan Training and Research HospitalMogadishu 2526Somalia Department of Radiology Mogadishu Somali TurkeyTraining and Research HospitalMogadishu 2526Somalia Department of Pathology Mogadishu Somali Turkey Recep Tayyip Erdogan Training and Research HospitalMogadishu 2526Somalia

BACKGROUND Mycobacterium tuberculosis(TB)is the causative agent of TB,a chronic granulo-matous *** disease is prevalent in low-income countries,posing a significant global health *** TB is one of the three *** disease can mimic other intra-abdominal conditions,leading to delayed diagnosis owing to the absence of specific *** gastric outlet obs-truction(GOO)remains a frequent complication,its incidence has declined with the advent of proton pump inhibitors and Helicobacter pylori eradication *** TB can cause upper gastrointestinal hemorrhage,obstruction,and malignancy-like *** SUMMARY A 23-year-old male presented with recurrent epigastric pain,distension,nausea,vomiting,and weight loss,prompting a referral to a gastroenterologist *** examination revealed distorted gastric mucosa and signs of chronic ***,treatment was interrupted,possibly owing to vomiting or comorbidities such as human immunodeficiency virus infection or *** surgical intervention revealed a dilated stomach and diffuse thickening of the duodenal *** revealed gastric wall effacement with *** Primary gastric TB is rare,frequently leading to *** its rarity,suspicions should be promptly raised when encountering relevant symptoms,often requiring surgical intervention for diagnosis and treatment.

关键词： Tuberculosis Gastrointestinal tuberculosis Gastric outlet obstruction Gastroduodenal tuberculosis Case report

Exact and heuristic formulae to compute the geodetic height from the ellipse equation

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Geodesy and Geodynamics 2024年第2期15卷 150-155页

作者： mohamed Eleiche ahmed Hamdi Mansi Construction Department Faculty of EngineeringEgyptian Russian UniversityCairoEgypt Istituto Nazionale di Geofisica e Vulcanologia Sezione di PisaPisaPlItaly

The conversion of the cartesian coordinates of a point to its geodetic equivalent coordinates in reference to the geodetic ellipsoid is one of the main challenges in *** ellipse equation in the meridian plane significantly influences the value of the geodetic *** research analyzes this influence and how it can contribute to their *** study investigates the mathematical relation between them and presents an exact formula relating to the geodetic height and the ellipse *** addition,a heuristic formula for the relation between the geodetic height and the ellipse equation is proposed,which is independent of the geodetic latitude and has a relative accuracy better than 99.9 %.The calculation is stable,and the cost is low.

关键词： Ellipse equation Geodetic height Heuristic geodetic height

Prognostic Value of Retinal Nerve Fiber Layer and Ganglion Cell Complex after Optic Chiasmal Decompression

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Open Journal of Modern Neurosurgery 2019年第1期9卷 23-34页

作者： Shaymaa Hassan Salah ahmed mohamed ali Ophthalmology Department Kasr Al Ainy Hospital Cairo University Cairo Egypt Neurosurgery Department Kasr Al Ainy Hospital Cairo University Cairo Egypt

This paper is an attempt to ascertain the role of the optical coherence tomography by measuring the retinal nerve fiber layer thickness and ganglion cell complex area to predict postoperative visual outcome after chiasmal decompression. 16 eyes scheduled for chiasmal decompression surgery were assessed before and 3 months after surgery with standard automated perimetry and OCT (optical coherence tomography). Preoperative RNFL (retinal nerve fibre layer) thickness and GCC (ganglion cell complex) area were compared with 20 normal control eyes. 13 cases were operated by microscopic assisted endoscopic endonasal transsphenoidal approach;the remaining 3 cases were operated transcranially. Spearman’s correlation analysis was used to evaluate the relationship between preoperative RNFL thickness, GCC area, postoperative mean deviation and temporal visual field sensitivity (1/Lambert). Preoperative measurements of RNFL thickness and all GCC area were significantly reduced in the patients compared with normal control. 3 months postoperative evaluation showed improvement of the visual field, but reduction in global and sectorial RNFL thickness except for nasal sector. Moreover, absolute postoperative (not pre-post change) visual field parameters were significantly correlated to preoperative RNFL (P = 0.00399 for mean deviation, P = 0.0023 for temporal sensitivity), GCC thickness (P = 0.00736 for mean deviation, P = 0.0469 for temporal sensitivity), with FLV (focal loss value) (P = 0.0012 for mean deviation, P = 0.0021 for temporal sensitivity) showed a higher correlation. Reduced RNFL thickness mainly, and GCC area minimally, were associated with the worst visual field outcome. FLV is a new prognostic value.

关键词： Optic Chiasm Decompression Surgery OCT Perimetry Prognosis

Factors Affecting the Utilization of Antenatal Care among Married Women of Reproductive Age in Merca, Lower Shebelle, Somalia

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Journal of Biosciences and Medicines 2022年第11期10卷 165-175页

作者： ahmed Sheik Abdullahi Osman mohamed ali ahmed mohamed Hassan mohamed Predrag Ilić Mubarick Nungbaso Asumah Somali Institute of Disaster and Environmental Research (SOMSIDER) Mogadishu Somalia PSRI Institute for Protection and Ecology of the Republic of Srpska Banja Luka Bosnia and Herzegovina Department of Global and International Health School of Public Health University for Development Studies Tamale Ghana

Worldwide more than thousands of women and new born are at the danger of die from pregnancy and child delivery complications. Antenatal care (ANC)/ pregnancy care is the health care where expecting mothers and new born receive medical care or medical attention. The aim of this study is to examine factors affecting the utilization of antenatal care among married women of reproductive age in Merca, lower Shebelle, Somalia. Methodology: This is a descriptive cross-sectional and qualitative study design that was carried out from June to August 2022 and this study was carried out in Merca, district lower Shabelle, Somalia. Data were collected from 325 married women of reproductive age who have at least one child and more than living in Merca district. Result: Our study found that the magnitude of antenatal care uptake was 31.1% during the examined period. Very low utilization of antenatal care in Somali women is worrying in the face of high vulnerability of maternal complications. In terms of age diverse and utilization of antenatal care, women in younger age group 15 - 30 were more to utilize antenatal care services than with women in older age group 31 years above (p-value < 0.007). Our study also identified that there is association between level of education and level of utilization among women about antenatal care services (p-value < 0.001). In terms of level of awareness about antenatal care services, it is significantly associated with the level of utilization antenatal care (p-value < 0.001). Our study identified that the number of complaining complications related previous pregnancy that have no awareness about antenatal care services was higher than number of utilized antennal care awareness about antenatal care (p-value < 0.001). Based on these results, it is recommended to improve women’s awareness about antenatal care services by using health education program.

关键词： Antenatal Care Pregnant Women Utilization Reproductive Age

Postpartum Depression and Associated Factors among Mothers Who Gave Birth in the Last 12 Months in Mogadishu Somalia, Community Based Cross-Sectional Study

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Health 2022年第10期14卷 1059-1080页

作者： Samira Abdurrahman Mohamuud mohamed Ibrahim Abukar Mustafa Yusuf ahmed Mustafa Abdirahman ali Ikram Adam Abdurahman Mariam Hassan mohamed mohamed ahmed ali Mogadishu Medical and Imaging Academy Mogadishu Somalia Health Center for Muslim Aid Mogadishu Somalia Health Sector of Benadir Regional Administration Mogadishu Somalia Jazeera University Mogadishu Somalia Emergency Department Demertini Public Hospital Mogadishu Somalia Medical Department Mogadishu Medical and Imaging Academy Mogadishu Somalia

Postpartum depression (PPD) is a term applied to describe depressive symptoms occurring during the first year of the postpartum period and is characterized by low mood, loss of enjoyment, reduced energy, and activity, marked functional impairment, reduced self-esteem, ideas or acts of self-harm or suicide. The women’s change into motherhood is a difficult period that involves significant changes in the psychological, social and physiological aspects, and is considered to increase vulnerability for the development of mental illness. In Somalia, 1 in 20 women aged 15 - 49 die due to pregnancy- or birth-related complications every year. This makes being pregnant in Somalia a risk that has its own stress and anxiety. Objective: To evaluate postpartum depression and associated factors among mothers who gave birth in the last 12 months in Mogadishu, Somalia. Methodology: The study is analytic cross sectional study design in which postpartum depression and its associated factors are measured. We used Cochran’s formula (Z2p(1 – p)/d2). Results: One fifth of the study population was found to have postpartum depression and the factors relating to it included marital status, substance abuse, mode and place of delivery. Conclusion: This shows that neglected mental health of the mothers in Somalia has its burden on the society. Recommendation: Mental health care component should be integrated with maternal care programs available in the country to work on prevention and control of motherhood related stress and depression among mothers who are giving birth under the very difficult circumstances in the country.

关键词： Mental Health Depression Childbirth Postpartum Postpartum Depression Stress Anxiety

Treatment of Resistant Clubfoot with Soft Tissue Release and Alkhooly External Fixator

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Open Journal of Orthopedics 2013年第7期3卷 314-320页

作者： ali Zein A. A. Al-Khooly mohamed ali ahmed mohamed Ebrahim El-Hawary ali Department of Orthopedic and Trauma El-Minia University Hospital El-Minia Egypt.

After the first research with this technique done by the first author, ten operations on the foot and ankle were performed on five patients (two boys and three girls) suffering from severe club foot deformity all with bilateral foot affection. Their ages ranged from five to fourteen years. All of them were treated by soft tissue release, skin flap (rotational flap), supplemented with Alkhooly external fixator. The follow up period ranged from two to seven years. The results according to Mittal (1987) [1] were excellent in eight feet (80%) and good in two feet (20%).

关键词： Clubfoot-External Fixator Soft Tissue Release

Performance of Water and Mercury Triple Points Reference Cells under Adiabatic Conditions

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Journal of Physical Science and Application 2015年第1期5卷 1-5页

作者： mohamed Gamal ahmed ahmed ali El-Matarawy Hoda mohamed Abo Dorra National Institute for Standards Tersa St. El Haram Giza 12211 Egypt

Two new miniature metallic sealed-cells containing the triple point of water, WTP （273.16 K） and the triple point of mercury, HgTP （234.3156 K） have been constructed for the realization of the International Temperature Scale of 1990 （ITS-90） at the National Institute of Standards （NIS-Egypt）. The two new cells, in addition to a previously realized argon and oxygen triple point cells, will provide facilities for the calibration of capsule-type standard platinum resistance thermometers （CSPRTs） at one single run. Many phase transition plateaux were carried out and compared to the laboratory large reference cells using the same thermometers in order to test the performance of the new cell.

关键词： CSPRTs ITS-90 metallic cells fixed points uncertainty.

The Recurrence of Natural Disasters in Jowhar, Middle Shabelle Region, Somalia: The Causes and Impacts

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Journal of Environmental Protection 2022年第9期13卷 657-670页

作者： mohamed ali ahmed mohamed Hassan mohamed Mst. Mahmuda Parvin Predrag Ilić Department of Environmental Science Stamford University Bangladesh Dhaka Bangladesh Department of Public and Environmental Health Somali International University Mogadishu Somali PSRI Institute for Protection and Ecology of the Republic of Srpska Banja Luka Bosnia and Herzegovina

Natural disasters usually involve a phenomenon with consequences that exceed the response capabilities of local communities and have a significant impact on the region’s socioeconomic development. Droughts, floods, and hurricanes are all natural disasters that jeopardize the environment and the lives of Somalis. Severe floods have devastated the south and central parts of the country multiple times, destroying infrastructure and homes and killing many vulnerable people. Droughts in the south and central parts of the country, particularly in the Middle Shebelle region, have killed a number of children and mothers. It also had a negative influence on crops and cattle. Objective of this study is to know the recurrence of Natural Disasters in Jowhar, Middle Shabelle region, Somalia: The Causes and Impacts. The Somali people are completely aware of natural disasters such as droughts and floods, and they are self-sufficient in dealing with the consequences of these disasters. Furthermore, the Somali government has not fully created environmental laws to protect and conserve the environment, and the majority of laws, rules, acts, and regulations are not used or administered effectively. We also found that the Somali government is not yet financially prepared to deal with these crises, and that there are no strategic plans in the central government or even state administrations to prevent or at least control these disasters from causing extreme harm to the community and the environment.

关键词： Natural Disasters Floods and Droughts Causes Impacts of the Environment

Numerical Analysis of Bacterial Meningitis Stochastic Delayed Epidemic Model through Computational Methods

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 311-329页

作者： Umar Shafique mohamed Mahyoub Al-Shamiri ali Raza Emad Fadhal Muhammad Rafiq Nauman ahmed Department of Mathematics National College of Business Administration and EconomicsLahore54660Pakistan Department of Mathematics Applied CollegeMahayl AssirKing Khalid UniversityAbha62529Saudi Arabia Department of Physical Sciences The University of ChenabGujrat50700Pakistan Department of Mathematics&Statistics College of ScienceKing Faisal UniversityP.O.Box 400Al-Ahsa31982Saudi Arabia Department of Computer Science and Mathematics Lebanese American UniversityBeirut1102-2801Lebanon Department of Mathematics Faculty of Science and TechnologyUniversity of Central PunjabLahore54000Pakistan Department of Mathematics and Statistics University of LahoreLahore54000Pakistan

Based on theWorld Health Organization(WHO),Meningitis is a severe infection of the meninges,the membranes covering the brain and spinal *** is a devastating disease and remains a significant public health *** study investigates a bacterial meningitis model through deterministic and stochastic ***-compartment population dynamics explain the concept,particularly the susceptible population,carrier,infected,and *** model predicts the nonnegative equilibrium points and reproduction number,i.e.,the Meningitis-Free Equilibrium(MFE),and Meningitis-Existing Equilibrium(MEE).For the stochastic version of the existing deterministicmodel,the twomethodologies studied are transition probabilities and non-parametric ***,positivity,boundedness,extinction,and disease persistence are studiedrigorouslywiththe helpofwell-known *** and nonstandard techniques such as EulerMaruyama,stochastic Euler,stochastic Runge Kutta,and stochastic nonstandard finite difference in the sense of delay have been presented for computational analysis of the stochastic ***,standard methods fail to restore the biological properties of the model,so the stochastic nonstandard finite difference approximation is offered as an efficient,low-cost,and independent of time step *** addition,the convergence,local,and global stability around the equilibria of the nonstandard computational method is studied by assuming the perturbation effect is *** simulations and comparison of the methods are presented to support the theoretical results and for the best visualization of results.

关键词： Bacterial Meningitis disease stochastic delayed model stability analysis extinction and persistence computational methods