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Novel yellow colored flame compositions with superior spectral performance

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Defence Technology（防务技术） 2017年第1期13卷 33-39页

作者： Ramy Sadek mohamed kassem mohamed Abdo Sherif Elbasuney School of Chemical Engineering Military Technical CollegeKobry El-KobbaCairoEgypt

The production of colored flames is the primary purpose of military signaling, projectile tracing, and illuminating devices. Certain elements and compounds when heated to high temperature have the unique property of emitting lines or narrow bands in the visible region(380-780 nm). This study, reports on the development of novel yellow colored flame compositions with enhanced spectral performance in terms of luminous intensity, and color quality to standard Russian yellow tracer. The light intensity and the imprint spectra of developed yellow flares were measured using digital luxmeter and UV e Vis. spectrometer respectively. The main giving of this study is that the light intensity, and color quality of Russian yellow tracer were improved by 287%, and 170% respectively. This was accomplished by means of optimizing the ratio of novel binder to color source using aluminum metal fuel. Aluminumbased formulations were found to maximize the formation of yellow reactive emitting specimens, and to eliminate any interfering incandescent emission resulted from Mg O. Quantification of yellow color emitting specimens in the combustion gaseous products was achieved using chemical equilibrium thermodynamic code named ICT(Institute of Chemical Technology in Germany, Virgin 2008); in an attempt to judge the light quality. This improvement in yellow flare performance established the rule that the emission intensity increases as the reaction temperature increases. In the meantime upper limit of temperature was avoided to maximize the color quality.

关键词： Pyrotechnics Colored flames Yellow tracer Atomic spectroscopy Color quality

Novel colored flames via chromaticity of essential colors

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Defence Technology（防务技术） 2019年第2期15卷 210-215页

作者： Ramy Sadek mohamed kassem mohamed Abdo Ahmed Fahd Hesham Tantawy Amir Elsaidy Sherif Elbasuney School of Chemical Engineering Military Technical College

Colored flame compositions have distinctive variety of applications ranging from military signaling,rocket tracking, and illuminating devices. Certain elements and compounds when heated to high temperature are able to emit unique wavelengths in the visible region. This study, reports on the development of novel colored flames that cannot be generated by emitting atomic/molecular species. This was achieved by using chromaticity of basic colored flames. Mixing of high quality primary colored flames including Blue, Yellow, and Red in proper ratio was conducted; any interfering incandescent emission resulted from MgO was eliminated using Al metal fuel. The spectral characteristics in terms of luminous intensity, and color quality were evaluated using digital luxmeter and UV-Vis. spectrometer respectively.High quality mixed colored flames include violet, sweet pink, and marigold were developed. This study shaded the light on the state of the art for the real development of novel colored flame compositions and chromaticity of basic colored flames.

关键词： Pyrotechnics Colored flame Atomic spectroscopy Molecular spectroscopy Luminous intensity Color quality Chromaticity

Effect of reperfusion strategy on QT dispersion in patients with acute myocardial infarction:Impact on in-hospital arrhythmia

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World Journal of Cardiology 2023年第3期15卷 106-115页

作者： mohamed Aboel-kassem F Abdelmegid mohamed M Bakr Hamdy Shams-Eddin Amr A Youssef Ahmed Abdel-Galeel Department of Cardiovascular Medicine Assiut University Heart HospitalAssiut UniversityAssiut 71526Egypt Department of Cardiology Sohag Heart and GIT CenterSohag 85264Egypt Department of Cardiology Assiut Police HospitalAssiut 71526Egypt Department of Cardiology Qena General HospitalQena 92354Egypt

BACKGROUND Myocardial ischemia and ST-elevation myocardial infarction(STEMI)increase QT dispersion(QTD)and corrected QT dispersion(QTcD),and are also associated with ventricular arrhythmia.AIM To evaluate the effects of reperfusion strategy[primary percutaneous coronary intervention(PPCI)or fibrinolytic therapy]on QTD and QTcD in STEMI patients and assess the impact of the chosen strategy on the occurrence of in-hospital arrhythmia.METHODS This prospective,observational,multicenter study included 240 patients admitted with STEMI who were treated with either PPCI(group I)or fibrinolytic therapy(group II).QTD and QTcD were measured on admission and 24 hr after reperfusion,and patients were observed to detect in-hospital arrhythmia.RESULTS There were significant reductions in QTD and QTcD from admission to 24 hr in both group I and group II patients.QTD and QTcD were found to be shorter in group I patients at 24 hr than those in group II(53±19 msec vs 60±18 msec,P=0.005 and 60±21 msec vs 69+22 msec,P=0.003,respectively).The occurrence of in-hospital arrhythmia was significantly more frequent in group II than in group I(25 patients,20.8%vs 8 patients,6.7%,P=0.001).Furthermore,QTD and QTcD were higher in patients with in-hospital arrhythmia than those without(P=0.001 and P=0.02,respectively).CONCLUSION In STEMI patients,PPCI and fibrinolytic therapy effectively reduced QTD and QTcD,with a higher observed reduction using PPCI.PPCI was associated with a lower incidence of in-hospital arrhythmia than fibrinolytic therapy.In addition,QTD and QTcD were shorter in patients not experiencing in-hospital arrhythmia than those with arrhythmia.

关键词： Arrhythmia QT dispersion ST-segment elevation myocardial infarction Reperfusion Primary percutaneous coronary intervention Fibrinolytic therapy

Ultrasound Role in Diagnosis of Carpal Tunnel Syndrome and Postoperative Evaluation in Endoscopic Carpal Tunnel Release

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Open Journal of Modern Neurosurgery 2019年第3期9卷 248-257页

作者： Hossam Elsobky mohamed kassem Tamer Youssif Ahmed Abd-Elkhalek Amr Farid Khalil Neurosurgery Department Mansoura University Mansoura Egypt General Surgery Department Mansoura University Mansoura Egypt Diagnostic and Interventional Radiology Department Mansoura University Mansoura Egypt

Carpal tunnel syndrome (CTS) represents about 90% of all entrapment neuropathies and is caused by entrapment of the median nerve while passing in the carpal tunnel. US has revealed equal effectiveness as magnetic resonance imaging (MRI) in diagnosis of CTS;however further attention should be given in case of equivocal results from nerve conduction studies (NCS) and/or before endoscopic surgical intervention. This study was conducted to evaluate the role of US in diagnosis and treatment of CTS which was done by endoscopic release. This is a prospective study including patients having CTS who were treated by endoscopic release between December 2017 and December 2018. All cases were evaluated by electrophysiological studies and US at the preoperative period. US was used to measure the cross sectional area (CSA) of the median nerve. Patients underwent endoscopic carpal tunnel release and were called for follow up after 1, 3, and 6 months for clinical and US assessment of the median nerve. Forty cases were included with mean age of 27.85 years. Numbness was the predominant symptom (92.5%) followed by wrist pain (85%). The mean diameter of median nerve showed a significant decrease at different time points (P < 0.001). The sensitivity of US in diagnosis of CTS was 87.5% in the preoperative assessment as compared to electrophysiological study. The sensitivity of US in detecting the improvement of CTS as compared to clinical examination increased from 28% at 1 month postoperative, 53.4% at 3 months to 92.1% at 6 months. Ultrasonography is a sensitive non-invasive diagnostic tool in diagnosis of CTS preoperative and diagnosis of improvement of the patients postoperatively especially at 6 months.

关键词： Carpel Tunnel Syndrome Ultrasonography Endoscopic Release

Pharmacist-Managed Anticoagulation Services for Warfarin Management in Tertiary Hospitals:The Egyptian Experience

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Journal of Clinical and Nursing Research 2022年第3期6卷 24-30页

作者： Amira B kassem Asmaa M Farrag Dina Shafea Osama mohamed Ibrahim Department of Clinical Pharmacy and Pharmacy Practice Faculty of Pharmacy Damanhour University Egypt Abo-Kir General Hospital Ministry of HealthAlexandriaEgypt Department of Pharmacy Practice and Pharmacotherapeutics Faculty of PharmacyUniversity of SharjahUAE Department of Clinical Pharmacy Faculty of PharmacyCairo University Egypt

Background:Warfarin is widely regarded as the main anticoagulant in lowering the risk of thromboembolism.This study used indicators to compare pharmacist-managed anticoagulation services,using a well-prepared protocol,with physician-managed anticoagulation services・Methods:A retrospective prospective pilot study was conducted to compare patient outcomes before and after transitioning patients to phannacist-managed anticoagulation services,comparing the proportion of those with therapeutic international normalized ratio(INK),subtherapeutic INK,and supratherapeutic INR,as well as their bleeding occurrences as indicators of assuring quality care.Results:A significant improvement in anticoagulation management was noted in the transition to pharmacist-managed anticoagulation services.The proportion of those with subtherapeutic INR decreased from 61.8%to 11.8%(p<0.001),those with supratherapeutic INR decreased from 20.6%to 2.9%(p<0.001),those with therapeutic INR increased from 17.6%to 85.3%(p<0.001),and the occurrence of bleeding decreased from 11.8%to 0.0%,without significant difference in warfarin doses(median from 4 before the transition to 5 after);in addition,the time to reach therapeutic INR decreased from 12-24 weeks to 2-8 weeks after transitioning to pharmacist-managed anticoagulation services.Conclusion:Pharmacist-managed anticoagulation services are considered safer and more effective than physician-managed anticoagulation services alone in terms of patientsJ adherence and satisfaction,which provide an excellent opportunity for quality assurance care.

关键词： Pharmacist-managed anticoagulation services Warfarin Anticoagulation clinic Therapeutic drug monitoring

The Screening of Diabetes, Obesity and Hypertension Risks Associated with Hepatitis C Within the Egyptian Population in a Community Pharmacy Setting

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Journal of Clinical and Nursing Research 2022年第3期6卷 31-42页

作者： Amira B kassem mohamed EA Abdelrahim Alaa Mousa Amira Harun Heba Al-husseini Salma Khaled Mahmoud Elhadidy Osama mohamed Ibrahim Department of Clinical Pharmacy and Pharmacy Practice Faculty of PharmacyDamanhour University Egypt Department of Clinical Pharmacy and Pharmacy Practice Beni-Suef University Faculty of PharmacyBeni-SuefEgypt Hepatology Department Ministry of HealthEgypt Department of Pharmacy Practice and Pharmacotherapeutics College of PharmacyUniversity of SharjahUAE Department of Clinical Pharmacy Faculty of PharmacyCairo University CairoEgypt

Background:Diabetes and hypertension have been identified as risk factors for HCV complications in previous studies.This has sparked the interest in the field of prevention by identifying at-risk individuals and increasing investments for screening among pharmacists.The aim of this study was to screen for risk factors,including age,gender,BMI,hypertension,diabetes,and obesity,in Egyptian patients with HCV Methods:A prospective cross-sectional study was carried out from September 2018 to February 2019,with a total of 1,959 medical records collected.By comparing the patients'characteristics,variables related to metabolic risk,and body composition measurements,regression models have been established to determine any confounding factors.Results:The prevalence of HCV antibody was 41.0%in men and 59.0%in women.Among the variables included in the regression analysis,age,BMI,and uncontrolled hypertension were found to have statistically significant associations with diabetes in HCV positive cases(p40 years old with high BMI were found to have significant associations with both,diabetes and hypertension(p40,and DM(p<0.001).Conclusion:HCV infection and metabolic disorders have a closed cycle relationship.Reducing the complications of DM has a promising prospective of limiting the complications of HCV .

关键词： Hepatitis C virus Diabetes Obesity Hypertension

Isolation and characterisation of human gingival margin-derived STRO-1/MACS^+ and MACS^-cell populations

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International Journal of Oral Science 2015年第2期7卷 80-88页

作者： Karim M Fawzy El-Sayed Sebastian Paris Christian Graetz Neemat kassem mohamed Mekhemar Hendrick Ungefroren Fred Fndrich Christof Drfer Clinic for Conservative Dentistry and Periodontology School of Dental MedicineChristian Albrechts University Oral Medicine and Periodontology Department Faculty of Oral and Dental MedicineCairo University Department of Operative and Preventive Dentistry Charite-Universitatsmedizin Berlin Department of Clinical Pathology Faculty of MedicineCairo University Clinic for Applied Cellular Therapy Christian Albrechts University

Recently,gingival margin-derived stem/progenitor cells isolated via STRO-1/magnetic activated cell sorting（MACS） showed remarkable periodontal regenerative potential in vivo.As a second-stage investigation,the present study＇s aim was to perform in vitro characterisation and comparison of the stem/progenitor cell characteristics of sorted STRO-1-positive（MACS~＋） and STRO-1-negative（MACS^-） cell populations from the human free gingival margin.Cells were isolated from the free gingiva using a minimally invasive technique and were magnetically sorted using anti-STRO-1 antibodies.Subsequently,the MACS~＋ and MACS^- cell fractions were characterized by flow cytometry for expression of CD14,CD34,CD45,CD73,CD90,CD105,CD146/MUC18 and STRO-1.Colony-forming unit（CFU） and multilineage differentiation potential were assayed for both cell fractions.Mineralisation marker expression was examined using real-time polymerase chain reaction（PCR）.MACS~＋ and MACS- cell fractions showed plastic adherence.MACS~＋ cells,in contrast to MACS- cells,showed all of the predefined mesenchymal stem/progenitor cell characteristics and a significantly higher number of CFUs（P〈0.01）.More than 95%of MACS~＋ cells expressed CD105,CD90 and CD73;lacked the haematopoietic markers CD45,CD34 and CD14,and expressed STRO-1 and CD146/MUC18.MACS- cells showed a different surface marker expression profile,with almost no expression of CD14 or STRO-1,and more than 95%of these cells expressed CD73,CD90 and CD146/MUC18,as well as the haematopoietic markers CD34 and CD45 and CD105.MACS~＋ cells could be differentiated along osteoblastic,adipocytic and chondroblastic lineages.In contrast,MACS- cells demonstrated slight osteogenic potential.Unstimulated MACS~＋ cells showed significantly higher expression of collagen I（P〈0.05） and collagen III（P〈0.01）,whereas MACS^- cells demonstrated higher expression of osteonectin（P〈0.05;MannWhitney）.The present study is the first to compare gingival MACS~＋ and MACS- cell populations demonstrating that MACS~＋ cells,in contrast to MACS-

关键词： gingival progenitor populations margin periodontal cytometry collagen isolation dental sorting

Multiobjective Nonlinear Symmetric Duality Involving Generalized Pseudoconvexity

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Applied Mathematics 2011年第10期2卷 1236-1242页

作者： mohamed Abd El-Hady kassem 不详

The purpose of this paper is to introduce second order (K, F)-pseudoconvex and second order strongly (K, F)- pseudoconvex functions which are a generalization of cone-pseudoconvex and strongly cone-pseudoconvex functions. A pair of second order symmetric dual multiobjective nonlinear programs is formulated by using the considered functions. Furthermore, the weak, strong and converse duality theorems for this pair are established. Finally, a self duality theorem is given.

关键词： Multiobjective Programming Second-Order Symmetric Dual Models Duality Theorems Pseudoconvex Functions Cones

Development of an Arabic version of the National Eye Institute Visual Function Questionnaire as a tool to study eye diseases patients in Egypt

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International Journal of Ophthalmology(English edition) 2014年第5期7卷 891-897页

作者： Nizar Saleh Abdelfattah mohamed Amgad Ahmed A Salama Marina E Israel Ghada A Elhawary Ahmed E Radwan mohamed M Elgayar Tamer M EL Nakhal Islam T Elkhateb Heba A Hashem Doha K Embaby Amira A Elabd Reem K Elwy Magdi S Yacoub Hamdy Salem mohamed Abdel-Baqy Ahmad kassem Doheny Image Reading Center Doheny Eye InstituteUniversity of California Department of Ophthalmology Faculty of MedicineCairo University Department of Ophthalmology Faculty of MedicineMenoufia University Faculty of Medicine Ain Shams University Department of Ophthalmology Faculty of Medicine University of Alexandria Faculty of Medicine Beni Suef University Alexandria Regional Center for Women's Health&Development

AIM:To develop and test an Arabic version of the National Eye Institute Visual Function Questionnaire-25(NEI-VFQ-25).METHODS:NEI-VFQ-25 was translated into Arabic according to WHO translation guidelines. We enrolled adult consenting patients with bilateral chronic eye diseases who presented to 14 hospitals across Egypt from October to December 2012, and documented their clinical findings. Psychometric properties were then tested using STATA.RESULTS:We recruited 379 patients, whose mean age was(54.5±15)y. Of 46.2% were males, 227 had cataract,31 had glaucoma, 23 had retinal detachment, 37 had diabetic retinopathy, and 61 had miscellaneous visual defects. Non-response rate and the floor and ceiling numbers of the Arabic version(ARB-VFQ-25) were calculated. Internal consistency was high in all subscales(except general health), with Cronbach-α ranging from0.702-0.911. Test-retest reliability was high(intraclass correlation coefficient 0.79).CONCLUSION:RB-VFQ-25 isareliableandvalidtool for assessing visual functions of Arabic speaking patients. However, some questions had high non-response rates and should be substituted by available alternatives. Our results support the importance of including self-reported visual functions as part of routine ophthalmologic examination.

关键词： Arabic psychometrics questionnaires National Institutes of Health visual function questionnaire