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Peripheral Hematological Parameters in Sudanese Women with Polycystic Ovary Syndrome
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作者 Shaza mohammed Enaam T. Elhaj +2 位作者 mohamed A. ahmed Reem Eltayeb Ishag Adam 《Case Reports in Clinical Medicine》 2022年第7期253-260,共8页
The aim of this study is to assess the association between polycystic ovarian syndrome (PCOS) and hematological parameters [hemoglobin, red cell parameters, white blood cells (WBCs), platelets volume (MPV)]. This is a... The aim of this study is to assess the association between polycystic ovarian syndrome (PCOS) and hematological parameters [hemoglobin, red cell parameters, white blood cells (WBCs), platelets volume (MPV)]. This is a matched case-control study (60 women in each arm of the study) which was conducted in Saad Abualila infertility center Hospital in Khartoum, Sudan. Infertile women with PCOS were the cases and healthy non pregnant women were the controls. The gynecological characteristics were gathered through questionnaire and blood samples were analyzed for different blood parameters by automated hematology analyzer. While the two groups were matched in their age;body mass index was significantly higher in women with PCOs compared to the normal control. The investigated different hematological parameters (hemoglobin, RBCs, RDW, WBCs, platelets and MPV) showed no statistical difference between the women with PCOS and the controls. 展开更多
关键词 HEMOGLOBIN Platelets Volume Polycystic Ovarian Syndrome Red Blood Cells White Blood Cells
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Clinico-Epidemiological Characteristics and Survival Outcomes of COVID-19 Infection in Kassala, Eastern Sudan
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作者 Abdualmoniem O. Musa Mushal Allam +5 位作者 Elhadi A. ahmed Nouh S. mohamed mohamed H. ahmed Abubakr Omer Tajeldin M. Abdallah Nadir Abuzeid 《Advances in Infectious Diseases》 CAS 2023年第1期96-108,共13页
Introduction: Severe acute respiratory syndrome coronavirus2 (SARS-CoV-2) represents a major health problem worldwide. Thus, early detection and appropriate management of the virus will influence the outcome of the di... Introduction: Severe acute respiratory syndrome coronavirus2 (SARS-CoV-2) represents a major health problem worldwide. Thus, early detection and appropriate management of the virus will influence the outcome of the disease. This study aimed to investigate the epidemiological characteristics and survival outcomes of patients with COVID-19 infection in Kassala, Eastern Sudan. Methods: A cross-sectional hospital-study was conducted among patients visiting Kassala teaching hospital with suspicion of COVID-19 infection. A structured questionnaire was used to gather clinical and socio-demo- graphic information from COVID-19 patients. Nasopharyngeal specimens and blood samples were collected and tested to confirm the diagnosis of COVID-19 infection using RT-PCR. Results: A total of 371 patients were enrolled in the study from September 2020 to January 2021, with mean age ± SD was 42.9 ± 19.9. The prevalence of COVID-19 infection was estimated at 61.7%. The majority were males 159 (69.4%), of university-level education, 96 (49.7%), and urban residents, 175 (9.7%). The most common symptoms were fever 215 (93.9%), cough 188 (82.1%), headache 179 (78.2%), and shortness of breath 154 (67.2%). Overall all mortality was reported as 16%. Older age group with the age ≥ 70, P P = 0.020, diabetes mellitus P = 0.029 were significantly associated with high case fatality. Conclusion: This study demonstrated that older age, male gender, laboratory tests (leukocytosis, lymphopenia, low Hemoglobin and high CRP) and various comorbid conditions significantly increase the disease severity and mortality. Therefore, attention should be paid to preventive measures to reduce the considerable impacts of the disease. 展开更多
关键词 COVID-19 INFECTION EPIDEMIOLOGY OUTCOME SUDAN
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基于氮化镓场效应晶体管的高性能48 V总线电源(英文) 被引量:2
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作者 王健婧 Suvankar BISWAS +1 位作者 mohamed H.ahmed Michael DE ROOIJ 《电源学报》 CSCD 北大核心 2019年第3期91-102,共12页
48 V电源架构在数据中心电源系统中的推广激发了人们对具有更高效率和功率密度的先进电源解决方案的极大兴趣。具有超低寄生电容和导通电阻的氮化镓场效应晶体管GaN FET(gallium nitride field effect transistor)开辟了一种新方法,可... 48 V电源架构在数据中心电源系统中的推广激发了人们对具有更高效率和功率密度的先进电源解决方案的极大兴趣。具有超低寄生电容和导通电阻的氮化镓场效应晶体管GaN FET(gallium nitride field effect transistor)开辟了一种新方法,可实现前所未有的转换器性能和小型化。评估了采用与适当功率等级相对应的各种拓扑结构的48 V电源架构的DC-DC电源转换中的GaN FET。首先涵盖GaN FET的开关特性分析;然后将 GaN FET用于开发各种48 V降压转换器,从同步降压、多电平和多相转换器到LLC谐振转换器;最后提供了选择合适GaN FET的指南。与传统基于MOSFET的转换器相比,这些基于GaN FET的转换器在不增加成本的情况下功率效率和功率密度显著提高。 展开更多
关键词 氮化镓 场效应晶体管 48 V电源架构 总线电源 多相变换器 多电平变换器 LLC谐振变换器
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Evaluation of the Neurodevelopmental Outcome of Toddlers with Spinal Dysraphism after Surgical Repair Using ASQ-3 Scores
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作者 Mujahid Imam Fawaz Eljili Marhoom +4 位作者 Sawsan Aldeaf Ali Awad ahmed Zidan mohamed Mustafa ahmed Sanna Taha 《Open Journal of Modern Neurosurgery》 2024年第1期14-29,共16页
Background: Spinal dysraphism represents a wide spectrum of congenital abnormalities of the spine. Myelomeningocele is considered the most common malformation and the most common we saw in our community, with its morb... Background: Spinal dysraphism represents a wide spectrum of congenital abnormalities of the spine. Myelomeningocele is considered the most common malformation and the most common we saw in our community, with its morbidity problems seen commonly in the postoperative period. ASQ-3<sup>TM</sup> Scores are the ages and stages questionnaire, third edition, and represent a tool to assess the development progress, especially in toddlers. Objectives: Evaluation of neurodevelopmental outcome among Sudanese toddlers with spinal dysraphism after surgical closure with or without a VP shunt using ASQ-3<sup>TM</sup> Scores. Methodology: This is a retrospective hospital-based study of 84 patients who underwent myelomeningocele repair at the National Center for Neurological Sciences (NCNS) during the period from 2017 up to 2019. Data were collected through a constructed questionnaire, including ASQ-3<sup>TM</sup> Scores. Data were processed and analyzed using the Statistical Package for Social Science (SPSS) computer program. Version 25. Results: 84 patients were included in this study;all patients were diagnosed with spinal dysraphism. Out of them, 51 (60.7%) were 2 years old, 33 (39.3%) were 3 years old, 45 (53.6%) were male, 45 (53.6%) of patients mothers attended ANC irregularly, and 54 (64.3%) their mothers didn’t receive folate supplements. 44 (52.3%) of patients underwent MMC repair only, while 40 (47.7%) underwent MMC repair and VP shunt. The commonest postoperative complication was infection, reported in 12 (14.3%) of patients, followed by VP shunt revision in 9 (10.7%) of patients. Neurological assessment showed that the majority of patients need further assessment with a professional, 57 (67.9%) of children don’t walk, run, or climb like other toddlers as their parent’s state;also, half of patients (42, 50%) had medical problems, and 27 (32.1%) of their parent’s state that they do not talk like other toddlers their age. There was a statistically significant association between post-operative complications and 展开更多
关键词 Toddlers’ Neurodevelopmental Outcome Myelomeningocele Evaluation ASQ-3 Scores Spinal Dysraphasim Neurodevelopmental Outcome
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Sero-Prevalence and Risk factors of Contagious Bovine Pleuropneumonia (CBPP) in Afgoye District Lower Shabelle Region, Somalia
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作者 ahmed mohamed ahmed Sumaya Hassan Ali +7 位作者 Abdisalam mohamed Ali Abdirazack Saleban Osman Binti Abubakar mohamed Abdifatah mohamud Ibar Shafii Abdullahi mohamed mohamed Abdelrahman mohamed ahmed Ali Omar Zakaria Ibrahim Issack 《Open Journal of Veterinary Medicine》 CAS 2024年第2期11-20,共10页
Contagious bovine Pleuropneumonia (CBPP) is an infectious and highly contagious respiratory disease of cattle and water buffalo, caused by the Mycoplasma mycoides subspecies mycoides. It induces significant economic l... Contagious bovine Pleuropneumonia (CBPP) is an infectious and highly contagious respiratory disease of cattle and water buffalo, caused by the Mycoplasma mycoides subspecies mycoides. It induces significant economic losses and leads to a severe livestock production problem, negatively influencing people’s livelihoods of affected countries. In Somalia, there is no updated data on the prevalence and distribution of the disease. Hence, a descriptive cross-sectional study was conducted from September 2022 to June 2023 in different villages under the Afgoye District of lower Shabelle region, Somalia. The main purpose of this study is to assess the sero-prevalence and identify the associated risk factors for the occurrence of the disease. In this study, villages, age, sex, breed, and body condition were considered as risk factors. A total of 90 blood samples were collected and tested in the laboratory using the Anti-CBPP Elisa kit test. Out of 90 serum samples from herd cattle, 32 were positive, resulting in an overall prevalence of 35.5%. In addition, we found a statistically significant variation between the prevalence of the disease and factors such as sex, age, body condition and breeds. In summary, the overall prevalence of Contagious bovine pleuropneumonia in this study area is worth to be considered because there is a low quality of health care and less awareness of the Contagious bovine Pleuropneumonia effects on herds, which warrants the official authorities to act and follow appropriate preventive and control measures to reduce the incidence of the disease and generate appropriate controlling and prevention measures in all regions of Somalia. 展开更多
关键词 Contagious Bovine Pleuropneumonia SERO-PREVALENCE CATTLE SOMALIA MYCOPLASMA Cross Sectional Study
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Assessment of Retention Ponds and Its Impacts on Health of Residents in Mogadishu, Somalia: Mixed Methods
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作者 mohamed ahmed Kullane mohamed Ibrahim Abdi-Soojeede 《Journal of Water Resource and Protection》 CAS 2024年第4期293-307,共15页
The purpose of this study was to evaluate the effects of retention ponds on the environment and population health by analyzing water samples from various ponds in Mogadishu, to determine the prevalence of waterborne i... The purpose of this study was to evaluate the effects of retention ponds on the environment and population health by analyzing water samples from various ponds in Mogadishu, to determine the prevalence of waterborne illnesses that occur during the rainy season in Mogadishu, and to find out what experts thought about the effects of retention ponds on the environment as well as population health in Mogadishu. Methods: Mixed designs were used in the study. The first design is an exploratory study where samples are taken from different retention ponds in Mogadishu. The second design involves gathering secondary data from the online FSNAU Dashboard regarding the incidence of rainfall and waterborne illnesses including malaria and cholera. Additionally, a cross-sectional survey of expert opinions using questionnaires was the third design. The 10 water samples were taken from retention ponds in Mogadishu as part of the sample size. Data on the fourth month was also gathered using the FNSAU dashboard, and seventy sample sizes were used for the expert self-administered questionnaire for the third design. Excel was used for data analysis in the initial design. While BMI SPSS versions 22 were used to analyze the data from the Self-administered Questionnaire, additional methods were utilized to compute descriptive statistics, such as mean and standard deviation, and to analyze demographic data in a frequency table. Findings: The results show that three samples had unsatisfactory scores (Grade D): Yaqshid (Warshadda Bastada) had a WQI of 80.85, Boondheer (Bondher Pond) had a WQI of 80.64, and Wartanabad (Xamar Jadiid Pond) had a WQI of 80.89. The remaining samples were all rated as fair (grade), which indicates that they ranged from 50 to 75. The months with the largest rainfall already occurred in December, November, and October, when the prevalence of diseases during the rainy season was highest for cholera cases. Although October and December saw a significant number of malaria cases, November did not. Retention ponds’ o 展开更多
关键词 RETENTION PONDS CONTAMINATION Water Quality Index Waterborne Diseases Mogadishu SOMALIA
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Mental Health Consequences among Sudanese Due to the Armed Conflicts and Civil Unrest of 2023: One Year Later
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作者 Sahar Moawia Balla Elnour Nahla Yousif Osman mohammed Saeed +7 位作者 Awadia Babiker mohammed Osman Abeer Alawad Hassan Eman mohamed Nour Hamad Alneel Mustafa Rowa Abdelmonem Sidig Hamato Malaz mohamed Khair Alsafi mohamed Amna Alnaim mohamed ahmed Osman Awab Abdelbagi Mustafa ahmed Jalal Abdelrasool Hassan Eltaib 《Journal of Biosciences and Medicines》 2024年第4期21-37,共17页
Aim: To investigate depression, anxiety, PTSD, and insomnia levels among Sudanese citizens after a year has passed since the start of Armed Forces conflict in Sudan. Methods: An online survey was distributed. It is co... Aim: To investigate depression, anxiety, PTSD, and insomnia levels among Sudanese citizens after a year has passed since the start of Armed Forces conflict in Sudan. Methods: An online survey was distributed. It is composed of five parts, covering the following areas: 1) sociodemographic data;2) depression assessment;3) generalized anxiety disorder assessment;4) post-traumatic stress disorder assessment;and 5) insomnia assessment. Statistical Package for Social Sciences version 27 was used for data analysis;frequency and percentage were used to describe the qualitative variables. Spearman’s correlation analysis and Chi-square test were used for correlation and association analysis;a P-value equal to or less than 0.05 was considered statistically significant. Results: The study included 283 participants, primarily female (76.0%), with a mean age of 35.26 ± 6.96 years. The majority of participants were married (50.5%) and had a university level of education (50.2%). At the start of the war, 70.3% of participants were inside the war zones, and at the time of data collection, 73.5% were outside Sudan. The length of stay in the war zone ranged from 1 to 300 days, with a mean of 48.59 ± 70.284 days. Additionally, 63.3% of participants stated that they did not receive any form of mental health intervention, and the remaining did not provide an answer. There was a high prevalence of moderate-severe depression (50.5%), moderate anxiety (35.3%), PTSD (56.5%), and sub-threshold insomnia (53.4%) among the participants. Correlation analyses revealed associations between demographic factors such as sex, age, marital status, and education and mental health issues. Notably, female participants showed a higher prevalence of PTSD (53.0%) compared to male participants (67.6%). Conclusions: There is a substantial impact of war-related trauma on mental health, revealing a high prevalence of moderate-severe depression, moderate anxiety, PTSD, and sub-threshold insomnia among the participants. This emphasizes the importance of tail 展开更多
关键词 SUDAN WAR Conflict MENTAL Health
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Human Kallikrein-2 and Free Prostate Specific Antigen as Biomarkers for Early Detection of Prostate Cancer, Sudan: A Case-Control Study
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作者 Osman Khalid Yousif Badreldin Elsonni Abdalla +4 位作者 mohammed Alimam M. ahmed Sami Mahjoub Taha ahmed Al Siddiq Ebraheem Muawia mohamed ahmed Elhadi Abdalla ahmed 《Open Journal of Clinical Diagnostics》 2023年第1期9-21,共13页
Background: Prostate cancer (PCa) is considered one of the major health threats facing males in Sudan. Prostate-specific antigen (PSA) test is the most important laboratory test used in the diagnosis of prostate cance... Background: Prostate cancer (PCa) is considered one of the major health threats facing males in Sudan. Prostate-specific antigen (PSA) test is the most important laboratory test used in the diagnosis of prostate cancer, the main disadvantage of PSA is its limited specificity, which triggered a lot of interest in development, more research on other markers such as serum human kallikrein-2 (KLK-2) and free prostate specific antigen (fPSA). Objectives: To evaluate the validity of serum kallikrein-2 (KLK-2) and free prostate specific antigen (fPSA) in the early detection of prostate cancer among Sudanese patients. Method: In this study seventy men were considered as a case subject, who were diagnosed as cancer prostate at Gezira Hospital for Renal Disease and Surgery (GHRDS), Sudan during the period February 2018 to July 2019. Randomly selected sixty patients of BPH patients and forty-five apparently healthy men as control subject. KLK-2, fPSA and PSA estimations were performed from serum samples using the principle of Enzyme Linked Immunosorbent Assay (ELISA). Results: The results revealed a highly significant difference between the serum levels individual biomarkers (KLK-2, fPSA, PSA) and multiple biomarkers (fPSA/PSA, KLK-2/fPSA, KLK-2/PSA) for patients with prostate cancer when compared with the control groups. Furthermore, the fPSA/PSA ratio was lower in the patients with prostate cancer (P value = 0.00) than in the control group, the fPSA/PSA ratio showed that best accuracy to differentiate prostate cancer from control group, fPSA cut-off value was found to be more than (18 ng/ml), with sensitivity (93%), specificity (80%), and odds ratio (55). Conclusions: The use of multiple biomarkers rather than individual biomarkers especially fPSA/PSA ratio improves the specificity as well as maintenance of higher sensitivity for early diagnosis of the prostate cancer. 展开更多
关键词 Kallikrein-2 PSA FPSA Prostate Cancer SUDAN
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Transurethral Resection of Bladder Tumour: Safe Implementation of Bipolar Technique
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作者 Abdulla Uthman mohamed Osama Abo Farha +1 位作者 mohamed ahmed Elbendary Osama mohamed Elashry 《Open Journal of Urology》 2023年第8期271-281,共11页
Background: Traditionally, monopolar transurethral resection was the standard surgery for bladder tumors. After developing the bipolar technique, it was noticed that patients’ morbidity was reduced. We aim to compare... Background: Traditionally, monopolar transurethral resection was the standard surgery for bladder tumors. After developing the bipolar technique, it was noticed that patients’ morbidity was reduced. We aim to compare bipolar and monopolar transurethral resection of bladder tumors in terms of efficacy, safety, and oncological outcomes. Patients and Methods: Clinical records of sixty patients with newly diagnosed bladder cancer who underwent either monopolar or bipolar transurethral resection between March 2019 and April 2021 were prospectively reviewed. Results: Thirty patients were included in each group. The mean age in monopolar and bipolar arms was 59.9 and 57.5 years, respectively. The obturator reflex occurred in 13.33% and 36.66% of the bipolar and monopolar arms, respectively (p = 0.032). Bladder perforation was reported in 2 cases in the monopolar arm. The resection time was significantly longer for the monopolar arm (25.45 Vs 22.85 minutes). Also, the monopolar arm reported longer mean irrigation (23.34 Vs 20.11, p = 0.039), with 1 TUR syndrome reported in the monopolar arm. The mean hemoglobin drop was more in the monopolar arm (0.9 Vs 0.5 gm/dl, p = 0.041). No statistical significance was reported regarding the histopathology results, and one patient in the monopolar group did not have muscle in his specimen. There was no statistically significant difference in recurrence and prognosis between both groups. Conclusions: The bipolar technique has demonstrated its reliability and efficiency as a surgical procedure, providing various advantages while minimizing the risk of complications. 展开更多
关键词 Bladder Cancer TURBT Monopolar and Bipolar
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Outcomes of Pregnancy with Group B Streptococcal Infections in Najran, Saudi Arabia
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作者 Majed Saeed Alshahrani Ali H. Alhajri +10 位作者 Fahad Thamer Almutairi Ashwag Hassan Abdelmajed Fatima Ibrahim Abdalla Yousra Bala Babkir Abdullah Mosab mohamedelamineltaib ahmed Faroug ahmed Abdelaal mohamed ahmed Mukhtar Mowafag Bushra Galaleldin Elsayed Marwa mohamed ahmed Elkhidir Babikir Nihal Altayeb Abdallah Selma mohammed Abdelgadir Elhabeeb 《Open Journal of Obstetrics and Gynecology》 2023年第3期395-402,共8页
Background: The gram-positive, beta-hemolytic, and chain-forming Group B Streptococcus (GBS), commonly known as Streptococcus agalactiae, may asymptomatically invade the human gastrointestinal and vaginal tracts. Howe... Background: The gram-positive, beta-hemolytic, and chain-forming Group B Streptococcus (GBS), commonly known as Streptococcus agalactiae, may asymptomatically invade the human gastrointestinal and vaginal tracts. However, GBS may become very invasive and pathogenic to the mother and baby during pregnancy, having negative effects. Study Aim: This study aims to investigate the pregnancy outcomes of women who tested positive for genitourinary GBS infection during pregnancy in Najran, Saudi Arabia. Methods: Data was collected retrospectively from patient files in Armed Forces Hospital, Najran, Saudi Arabia. Data collected were entered to a Microsoft Excel sheet, then imported and analysed using the Statistical Package for Social Sciences. Results: The study included 272 women of whom 66.5% were 31 to 45 years old. Gestational diabetes was diagnosed in 8.5% of the sample, 71.7% had a normal spontaneous vaginal delivery (NSVD), 1.8% had previous abortions, and 27.2% of new-borns were admitted to the NICU after delivery. There was a significant association between NICU admissions and women employment status (p = 0.001), gravidity (p = 0.001), parity (p = 0.001), history of abortions (p = 0.001), medical conditions (p = 0.049), and mode of delivery (p = 0.049). Conclusion: According to the findings of our study, GBS infection during pregnancy is associated to more NICU admissions. NICU admissions were significantly correlated with gestational diabetes, hypertension, and hypothyroidism in mothers but not with intrapartum antibiotic use. 展开更多
关键词 PREGNANCY Group B Streptococcal OUTCOMES
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孵化后期热处理对肉雏鸡骨骼肌和肝脏温敏TRP离子通道及线粒体功能的影响
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作者 李晓庆 李盛 +2 位作者 周晓铧 mohamed ahmed Fathi 李春梅 《南京农业大学学报》 CAS CSCD 北大核心 2024年第3期530-538,共9页
[目的]孵化后期热处理能够在一定程度上提高肉鸡的耐热性,而骨骼肌和肝脏线粒体功能及温敏瞬时电位(transient receptor potential,TRP)离子通道与机体耐热性密切相关。因此,本试验旨在研究孵化后期热处理(thermal manipulation,TM)对... [目的]孵化后期热处理能够在一定程度上提高肉鸡的耐热性,而骨骼肌和肝脏线粒体功能及温敏瞬时电位(transient receptor potential,TRP)离子通道与机体耐热性密切相关。因此,本试验旨在研究孵化后期热处理(thermal manipulation,TM)对雏鸡骨骼肌和肝脏温敏TRP离子通道及线粒体功能的影响。[方法]选取240枚AA肉鸡种蛋随机分为3组(每组8个重复,每重复10枚种蛋):CON组,37.5℃孵化;TM1组,在孵化期第16~18天39.5℃热处理3 h·d^(-1);TM2组,在孵化期第16~18天41.5℃热处理3 h·d^(-1)。出雏后测定1日龄直肠温度,检测胸肌、腿肌和肝脏组织相关基因表达水平。[结果]与CON组相比,孵化后期热处理显著降低了1日龄雏鸡的直肠温度(P<0.01),TM1组雏鸡腿肌器官指数显著增加(P<0.05)。与CON组相比,TM2组雏鸡胸肌的avUCP基因表达水平显著降低(P<0.01),COXⅣ(P<0.05)、Tfam(P<0.01)、PGC1α(P<0.05)、ATP5B(P<0.01)和IDH3α(P<0.01)基因表达水平均显著增加,TRPV1、TRPV2和TRPV3基因表达水平均显著降低(P<0.05),SERCA1基因表达水平显著增加(P<0.01)。与CON组相比,TM2组雏鸡腿肌的avUCP基因表达水平显著降低(P<0.01),ATP5B基因表达水平显著增加(P<0.05);TM2组雏鸡肝脏组织的Tfam和SERCA1基因表达水平显著增加(P<0.05)。相关性分析结果显示,温敏TRP基因表达水平与线粒体经典产热基因avUCP和avANT表达呈正相关关系,与线粒体氧化磷酸化功能相关基因表达水平呈负相关关系。[结论]孵化后期热处理可通过降低1日龄雏鸡胸肌的温敏TRP基因和线粒体产热相关基因表达水平水平,增加线粒体生物发生及氧化磷酸化功能相关基因表达水平,引起线粒体热适应性变化。 展开更多
关键词 肉鸡 孵化期热处理 温敏TRP离子通道 线粒体功能
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纳米润滑添加剂改善摩擦磨损提高发动机性能的研究 被引量:6
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作者 侯献军 王士成 mohamed KAMAL ahmed Ali 《润滑与密封》 CAS CSCD 北大核心 2018年第6期1-5,共5页
以5W-30润滑油为基础油,Al_2O_3/TiO_2为纳米添加剂,配制添加剂质量分数为2%的纳米润滑油。通过摩擦学性能试验台模拟缸套-活塞环摩擦副实际工作过程,研究Al_2O_3/TiO_2纳米添加剂对摩擦学性能的改善;通过场发射扫描电镜(FESEM)对活塞... 以5W-30润滑油为基础油,Al_2O_3/TiO_2为纳米添加剂,配制添加剂质量分数为2%的纳米润滑油。通过摩擦学性能试验台模拟缸套-活塞环摩擦副实际工作过程,研究Al_2O_3/TiO_2纳米添加剂对摩擦学性能的改善;通过场发射扫描电镜(FESEM)对活塞环样本微观形貌进行观察,确定表面磨损情况;通过发动机台架实验研究确定实际使用工作过程中,纳米添加剂对发动机动力性能的影响。结果表明,润滑油中加入Al_2O_3/TiO_2纳米添加剂后,缸套-活塞环摩擦副摩擦磨损性能得到明显改善,摩擦因数和活塞环磨损率显著下降,摩擦因数最大下降50.6%,平均下降42%;活塞环磨损率最大下降34.8%,平均下降27.2%;活塞环表面微观形貌得到明显改善,磨损表面得到修复,划痕显著减少;在转速为4 400 r/min时随着负荷逐渐增大,发动机台架实验输出功率最高提升24.2%,低负荷功率增幅显著,高负荷范围内功率平均提升3.3%,动力性能得到较大提升。 展开更多
关键词 润滑油 纳米添加剂 摩擦磨损
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Factors Affecting the Utilization of Antenatal Care among Married Women of Reproductive Age in Merca, Lower Shebelle, Somalia 被引量:1
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作者 ahmed Sheik Abdullahi Osman mohamed Ali ahmed +2 位作者 mohamed Hassan mohamed Predrag Ilić Mubarick Nungbaso Asumah 《Journal of Biosciences and Medicines》 CAS 2022年第11期165-175,共11页
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 bor... 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. 展开更多
关键词 Antenatal Care Pregnant Women UTILIZATION Reproductive Age
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Frequency of diabetic retinopathy and associated risk factors in Khartoum,Sudan:population based study 被引量:3
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作者 Einas S Elwali ahmed O Almobarak +3 位作者 Mona A Hassan Amir A Mahmooud Heitham Awadalla mohamed H ahmed 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2017年第6期948-954,共7页
AIM: To assess the frequency and associated risk fac- tors of diabetic retinopathy among Sudanese individuals with diabetes attending Makka Eye complex in Khartoum, Sudan. METHODS: The cross sectional hospital base... AIM: To assess the frequency and associated risk fac- tors of diabetic retinopathy among Sudanese individuals with diabetes attending Makka Eye complex in Khartoum, Sudan. METHODS: The cross sectional hospital based study recruited 316 individuals with diabetes from Makkah Eye Complex Retina Clinic. Standard questionnaire was used to collect demographic data, medical history and life style characteristics. Blood samples were taken to measure HbAlc and lipid profile. Fundus and slit lamp examination were performed for screening of diabetic retinopathy. RESULTS: Among 316 participants, 187 (59.2%) were males and 129 (40.8%) were females. The mean age of participants was 58.7+_10.5y. The overall frequency of retinopathy was 261 (82.6%). The percentages of the total participants with proliferative diabetic retinopathy (PDR) were 126 (39.9%) and non-proliferative diabetic retinopathy (NPDR) were 135 (42.7%). importantly, duration of diabetes mellitus (DM) (72.2% of more than 10y), being on oral hypoglycaemic drugs (versus insulin), and hypertension were all significant risk factors for diabetic retinopathy (P=0.00, 0.01 and 0.00 respectively). Complications ofdiabetes like diabetic foot (17.7%), history of amputation (6.7%) and clinically significant macular edema (CSME) (47.4%) of the eyes were all significant risk factors (P〈0.05). Logistic regression analysis showed that duration of diabetes, hypertension and CSME were found to be absolute risk factors (P=-0.007, 0.003 and 0,000 respectively). Duration of DM of more than 10y have more than double risk (OR--2.8), while having hypertension triples the risk of retinopathy (OR=3.1). CONCLUSION: High rates of diabetic retinopathy are noted among individuals with diabetes attending Makkah Eye hospital in capital Khartoum. Urgent strategies are needed to monitor and treat hypertension and optimize diabetes control in individuals with diabetes. More investment in diabetes services is 展开更多
关键词 DIABETES SUDAN diabetic retinopathy INSULIN
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The Recurrence of Natural Disasters in Jowhar, Middle Shabelle Region, Somalia: The Causes and Impacts
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作者 mohamed Ali ahmed mohamed Hassan mohamed +1 位作者 Mst. Mahmuda Parvin Predrag Ilić 《Journal of Environmental Protection》 CAS 2022年第9期657-670,共14页
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, a... 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. 展开更多
关键词 Natural Disasters Floods and Droughts CAUSES Impacts of the Environment
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Existence and Upper Semi-Continuity of Random Attractors for Nonclassical Diffusion Equation with Multiplicative Noise on Rn
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作者 Fadlallah Mustafa Mosa Abdelmajid Ali Dafallah +2 位作者 Qiaozhen Ma Eshag mohamed ahmed mohamed Y. A. Bakhet 《Journal of Applied Mathematics and Physics》 2022年第12期3898-3919,共22页
This paper is concerned with the existence and upper semi-continuity of random attractors for the nonclassical diffusion equation with arbitrary polynomial growth nonlinearity and multiplicative noise in H<sup>1... This paper is concerned with the existence and upper semi-continuity of random attractors for the nonclassical diffusion equation with arbitrary polynomial growth nonlinearity and multiplicative noise in H<sup>1</sup>(R<sup>n</sup>). First, we study the existence and uniqueness of solutions by a noise arising in a continuous random dynamical system and the asymptotic compactness is established by using uniform tail estimate technique, and then the existence of random attractors for the nonclassical diffusion equation with arbitrary polynomial growth nonlinearity. As a motivation of our results, we prove an existence and upper semi-continuity of random attractors with respect to the nonlinearity that enters the system together with the noise. 展开更多
关键词 Random Attractors Nonclassical Diffusion Equations Asymptotic Compactness Upper Semi-Continuity
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Knowledge, Attitude and Practice regarding Intermittent Preventive Treatment (IPTs) of Malaria among Pregnant Women Attending for Antenatal Care in Benadir Hospital at Benadir Region, Somalia
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作者 Abdullahi Muse mohamoud Magda Elhadi ahmed Yousif +5 位作者 Osman Khalafalla Saeed mohamed ahmed Allasow Yasmin Abdirahman Abdulle Ayan Abdiwali ahmed Anab Warsame Iye Shukri mohamed Abdi 《Health》 CAS 2022年第4期392-406,共15页
Background: Malaria in pregnancy is a preventable public health concern leading to a high prevalence of maternal morbidity, maternal mortality and adverse birth outcomes. Intermittent Preventive Treatment during pregn... Background: Malaria in pregnancy is a preventable public health concern leading to a high prevalence of maternal morbidity, maternal mortality and adverse birth outcomes. Intermittent Preventive Treatment during pregnancy using Sulfadoxine-Pyrimethamine (IPTp-SP) is one of the main strategies used to prevent malaria in pregnancy. This study was aimed to determine knowledge attitude and practice regarding intermittent preventive treatment IPT of malaria in pregnancy utilization among pregnant women attending antenatal center in benadir hospital wadajir district benadir region somalia during the period of the study from April 2021-July 2021. Methods: The study was descriptive cross-sectional retrospective Hospital based. The sample size was 60 respondents of pregnant women at 20 weeks to 36 weeks of gestation. Data were collected by interview method using structured questionnaire. The data were collected and then entered to Statistical Package for Social Science version 20 for analysis. Results: The study displayed that the majority of the respondents (58%) were in the 25 - 34 years’ age group. A total of 51 (85%) were married, while 17 (28%) had primary school education. 43 (72%) were housewives while only 11 (18%) were employed. A total 32 (53%) were had gravid more than Four times, while the study showed that, the majority of mothers 39 (65%) were had knowledge about Intermittent Preventive Treatment during pregnancy using Sulfadoxine-Pyrimethamine (IPTp-SP). The study showed that majority of the respondent 25 (42%) were getting health education awareness towards IPTp were from health care providers at health centers while 8 (13%) from Friends/relatives/neighbors, followed by 4 (6%) from their husband. And 34 (57%) were had convenience IPTp-SP tablet consumption at their current pregnancy while 26 (43%) did not. Conclusion and Recommendations: Inclusion there was good knowledge and positive attitude towards IPT despite poor utilization, the study recommended the ministry of health especially health promotion, 展开更多
关键词 Intermittent Preventive Treatment (IPT) Antenatal Care
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Prevalence and Associated Factors of Back Pain among Medical Students in Sudan
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作者 Shahda Shms Eldeen Khlf Alla ahmed Ragda Kabashy mohammed Bahar +6 位作者 Lana Alsiddig mohamed ahmed Aisha Ali Elameen Abbas Eiman Siddig Abd Elhadi ahmed Ruba Jabir Abdallah Seedahmed Shahd Yousif Hajomer Abdelgader Arwa ahmed Alhussain ahmed Khalid Elfadil Ibrahim Husein 《Health》 CAS 2022年第9期931-938,共8页
Background: Back pain affects old and young adults, and it is a common complain among medical students. Objective: To estimate the prevalence of back pain and associated factors among medical students in Sudan. Method... Background: Back pain affects old and young adults, and it is a common complain among medical students. Objective: To estimate the prevalence of back pain and associated factors among medical students in Sudan. Method: An observational multi-universal cross-sectional study was conducted from December 2021 to February 2022, involving 433 medical students selected by simple random sampling. Data were collected by electronic Google Form questionnaire designed to assess demographic features, back pain characteristics, and triggering factors. Data analysis was done by statistical package for social sciences. Result: The prevalence of back pain among medical students in Sudan is 69.3%, with a statistically insignificant difference between preclinical and clinical students (p value: 0.378), and between male and female students (p value: 0.826). The lower back is the commonest site of pain (75%). The majority of the students experience moderate pain (53.9%). They did not use medications (81%). Sitting for long hours is the most common trigger (87.9%) and the pain did not interfere with the daily activities (71%). Conclusion: Back pain is a common complain among medical students in Sudan. Medical schools should raise the awareness of the students about back pain. 展开更多
关键词 Back Pain Medical Students Medical School SUDAN
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Innovations in the Implementation of Polio Surveillance Enhancement Plan in Oyo State, Nigeria: Key Benefits, Lessons Learned, Challenges and Opportunities
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作者 Enya Bassey Bassey Walter Kazadi Mulomb +20 位作者 ahmed mohamed ahmed Khedr Rosemary Ifeoma Onyibe Olufunmilola Olawumi Kolude Oluwadare Marcus Oluwabukola Alawale Oluwatobi Adeoluwa Iyanda Omotunde Ogunlaja Taiwo Olabode Ladipo Maxwell Obeka Adeniyi Ayobami Adeniran Oluyinka Motunrayo Dania Olabumuyi Olubumi Olayide Oluwaseun Opeyemi Oni Moshood Babatunde Busari Faith Ehiaghe Ugba Ayobami Desmond Olatimehin Gbenga Stanley Olayinka Abayomi Oluwasegun Ayinde Chinwe Grace Azuka Olufemi Toheeb Okuneye ahmed Bello 《Health》 CAS 2022年第4期442-455,共14页
Background: Nigeria attained the milestone of being certified wild poliovirus free in the year 2020. However, a drop in the key performance indicators of polio surveillance system was across various Local Government A... Background: Nigeria attained the milestone of being certified wild poliovirus free in the year 2020. However, a drop in the key performance indicators of polio surveillance system was across various Local Government Areas (LGAs) in Oyo State. This drop highlighted the need for an innovative way of enhancing polio surveillance in Oyo State. Methods: This study was conducted in four phases and each phase utilized a cross-sectional study design and purposive sampling technique to select eligible LGAs and participants. LGAs that met at least two of the set-out criteria (had not reported at least a case of Acute Flaccid Paralysis (AFP) 12 months preceding the survey, with decline in AFP case detection rate, had not met AFP key indicators, are densely populated, and has an international border) were selected. A concurrent mixed method of data collection was utilized, and quantitative data were collected with a semi-structured questionnaire administered using Computer Assisted Personal Interviews (CAPI) during community active case search, health facility retroactive case search (HFRACS). Qualitative data collection was done through Focus Group Discussion (FGD). Surveillance intensification activities were conducted over eight weeks period. Data were analyzed using Microsoft Excel Software;summarization was done using frequencies and percentages while presentation was done using charts and spot maps. Results: A total of 1277, 49, 259 and 632 settlements, households and health facilities respectively were visited across 24 (73%) LGAs in Oyo State. Of the 150 suspected AFP cases identified, 45 (30%) were rejected cases, 33 (22%) were missed cases and 72 (48%) were true AFP cases. Non-Polio AFP Rate (NP-AFP rate) increased from 2.7 to 6.9 (P Conclusions: Innovative strategies implemented in AFP surveillance across Oyo State have resulted in improvement in AFP surveillance performance indicators in the State. There is therefore the need for dynamic and innovative ways of conducting AFP surveillance to prevent poliomyelitis 展开更多
关键词 Polio-Surveillance-Indicators Enhancement-Plan Innovations AFP-Case-Search
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Treatment of Mild to Moderate Hallux Valgus, Percutaneous Osteotomy versus Distal Chevron Osteotomy 被引量:1
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作者 ahmed mohamed ahmed Othman Islam Hassan Ali Hegazy 《Open Journal of Orthopedics》 2016年第6期150-157,共8页
Objective: The aim of this study was to compare two different surgical techniques for treating mild to moderate cases of hallux valgus. Methods: Forty-one patients (58 feet) with mild to moderate hallux valgus were tr... Objective: The aim of this study was to compare two different surgical techniques for treating mild to moderate cases of hallux valgus. Methods: Forty-one patients (58 feet) with mild to moderate hallux valgus were treated by either percutaneous technique (n = 24) patients (33 feet) or by distal chevron osteotomy (n = 17) (25 feet). Results: In the percutaneous group, after a mean follow up of 49.36 months, the mean correction of hallux valgus angle (HV) was 26.69&deg;in the intermetatarsal angle, average correction was 9.45&deg;. The mean improvement of American Orthopedic Foot and Ankle Score (AOFAS) was 46.45 points. In the chevron osteotomy group, the mean follow up of 51.56 months, the mean correction of hallux valgus angle was 26.78&deg;in the intermetatarsal angle, average correction was 9&deg;. The mean improvement of AOFAS was 44.76 points. Conclusion: Both techniques gave satisfactory results. However, the percutaneous technique is safer than the distal chevron osteotomy. 展开更多
关键词 Hallux Valgus Percutaneous Technique Chevron Osteotomy AOFAS
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