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A Review and Economic Analysis of Different Emission Reduction Techniques for marine Diesel Engines

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Open Journal of marine Science 2019年第3期9卷 148-171页

作者： mohamad Issa Hussein Ibrahim Adrian Ilinca m. yasser Hayyani Department of Applied Sciences Institut Maritime du Québec Rimouski Canada Department of Research and Development Institut Technologique de Maintenance Industrielle Sept-Iles Canada Department of mathematics Informatics and Engineering Université du Québec à Rimouski Rimouski Canada

The maritime industry is currently facing the challenges of adopting new technologies and operational practices with stricter international, national and local rules in order to reduce exhaust gas emissions from ships. The most objective of regulations introduced and presented by the Worldwide Sea Organization such as International maritime Organization (ImO) and the US Environmental Protection Agency (EPA) is to lessen the commitment shipping makes to worldwide and local discharges. This paper analyzes emissions from marine engines and the process of waste exhaust gas formation and provides a summary of the emission reduction technologies to satisfy mARPOL NOx tier III and EPA tier IV rules. The results showed the possibility of achieving a valuable emission reduction percentage if future diesel engines are equipped with pre-treatment, internal-treatment and/or post-treatment techniques. Economics impact for medium and low speed for category 3 marine diesel engines is also presented.

关键词： Air Pollution GHG ImO Requirements Tier III Tier IV Scrubber SCR Exhaust Gas Emissions

Assessment of seminal plasma laminin in fertile and infertile men

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Asian Journal of Andrology 2007年第1期9卷 63-67页

作者： mohamed R. El-Dakhly Gamil A. Tawadrous Taymour mostafa mohamed m. F. Roaia Abdel R. m. El-Nashar Shedeed A. Shedeed Ihab I. Kamel Amal A. Aziz yasser El-mohtaseb Andrology Department Faculty of Medicine Cairo University Cairo 12311 Egypt medical Biochemistry Department Faculty of Medicine Cairo University Cairo 12311 Egypt Clinical Pathology Department Faculty of Medicine Cairo University Cairo 12311 Egypt

Aim： To assess laminin levels in the seminal plasma of infertile and fertile men, and to analyze the correlation of laminin levels with sperm count, age, sperm motility and semen volume. methods： One hundred and twenty-five recruited men were equally divided into five groups according to their sperm concentration and clinical examination： fertile normozoospermia, oligoasthenozoospermia, non-obstructive azoospermia （NOA）, obstructive azoospermia （OA） and congenital bilateral absent vas deferens （CBAVD）. The patients＇ medical history was investigated and patients underwent clinical examination, conventional semen analysis and estimation of seminal plasma laminin by radioimmunoassay. Results： Seminal plasma laminin levels of successive groups were： 2.82 ± 0.62, 2.49 ± 0.44, 1.77 ± 0.56, 1.72 ± 0.76, 1.35 ± 0.63 U/mL, respectively. The fertile normozoospermic group showed the highest concentration compared to all infertile groups with significant differences compared to azoospermic groups （P 〈 0.05）. Testicular contribution was estimated to be approximately one-third of the seminal laminin. Seminal plasma laminin demonstrated significant correlation with sperm concentration （r = 0.460, P 〈 0.001） and nonsignificant correlation with age （r = 0.021, P = 0.940）, sperm motility percentage （r = 0.142, P = 0.615） and semen volume （r = 0.035, P = 0.087）. Conelusion： Seminal plasma laminin is derived mostly from prostatic and testicular portions and minimally from the seminal vesicle and vas deferens. Estimating seminal laminin alone is not conclusive in diagnosing different cases of male infertility.

关键词： male infertility semen seminal plasma testis basement membrane laminin azoospermia congenital bilateral absent vas deferens

Existence Theorem for a Nonlinear Functional Integral Equation and an Initial Value Problem of Fractional Order in L<sub>1</sub>(R<sub>+</sub>)

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Applied mathematics 2013年第2期4卷 402-409页

作者： Ibrahim Abouelfarag Ibrahim Tarek S. Amer yasser m. Aboessa mathematics Department Faculty of Science and Education Taif University Al-Khurmah Branch Taif KSA

The aim of this paper is to study the existence of integrable solutions of a nonlinear functional integral equation in the space of Lebesgue integrable functions on unbounded interval, L1(R+). As an application we deduce the existence of solution of an initial value problem of fractional order that be studied only on a bounded interval. The main tools used are Schauder fixed point theorem, measure of weak noncompactness, superposition operator and fractional calculus.

关键词： Nonlinear Functional Integral Equation Volterra Operator measure of Weak Noncompactness Fractional Calculus Schauder Fixed Point Theorem

Evaluation of Acute Toxicity and Dosimetric Parameters in High Risk Prostate Cancer Patients Treated by High Radiation Doses

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Journal of Cancer Therapy 2019年第8期10卷 654-670页

作者： mohamed A. Daoud yasser m. Saleh mohamed Elsherbini mostafa Al Etreby Department of Clinical Oncology and Nuclear medicine Mansoura Faculty of Medicine Mansoura University Mansoura Egypt Department of Oncology Fakeeh Hospital Jeddah Saudi Arabia Department of Oncology Saudi-German Hospital Group Abha Saudi Arabia Department of Clinical Oncology and Nuclear medicine Faculty of Medicine Menofia University Menofia Egypt Department of Clinical Oncology and Nuclear medicine Kasr Alainy Faculty of Medicine Cairo Egypt

For high risk prostate cancer, the treatment volumes and even dose levels are still a controversial issue. The aim of this study is to evaluate the dosemetric parameters and acute toxicity of dose-escalated whole pelvis (WP) Intensity modulated Radiation Therapy (ImRT) and volumetric modulated arc therapy (VmAT) prostate boost following neoadjuvant and concomitant with androgen deprivation therapy in high-risk prostate cancer patients. This analysis included 73 high-risk prostate cancer patients treated with WP-ImRT followed by boost to the prostate by VmAT to total dose of 80 Gy;between January 2014 and October 2016. Androgen deprivation therapy (ADT) was given for all patients before and during radiation therapy. Drawing the dose volume histograms (DVHs) was done for planning target volumes (PTVs), including Prostate PTV & nodal PTV, and organs at risk including rectum, bladder, femoral heads, and bowel bag for the plans. Acute radiation toxicities were reported during the radiation course and the following 3 months. The DVH analysis showed good coverage of PTVs and organs at risk doses were acceptable. No recorded acute Grade ≥ 3 toxicity. Acute grade 1 toxicity for Gastrointestinal (GI) and Genitourinary (GU) were 65% and 35% respectively, while Grade 2 toxicity was 30% for both. The Proctitis and frequency were the commonest acute toxicity and were maximal during the 5th week of radiation therapy. Dose escalation in two phases utilizing Simultaneous integrated boost (SIB) combined with ADT in high risk prostate cancer patient is feasible and associated with acceptable acute GI and GU toxicity.

关键词： Radiation Therapy Dose Escalation Cancer Prostate Androgen Deprivation Therapy

Novel neuroprotective and hepatoprorective effects of citric acid in acute malathion intoxication

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Asian Pacific Journal of Tropical medicine 2016年第12期9卷 1157-1169页

作者： Omar m.E.Abdel-Salam Eman R.Youness Nadia A.mohammed Noha N.Yassen yasser A.Khadrawy Safinaz Ebrahim El-Toukhy Amany A.Sleem Department of Toxicology and Narcotics National Research Centre medical Biochemistry National Research Centre Pathology National Research Centre Physiology National Research Centre Pharmacology National Research Centre

Objective: To study the effect of citric acid given alone or combined with atropine on brain oxidative stress, neuronal injury, liver damage, and DNA damage of peripheral blood lymphocytes induced in the rat by acute malathion exposure. methods: Rats were received intraperitoneal(i.p.) injection of malathion 150 mg/kg along with citric acid(200 or 400 mg/kg, orally), atropine(1 mg/kg, i.p.) or citric acid 200 mg/kg+atropine 1 mg/kg and euthanized 4 h later. Results: malathion resulted in increased lipid peroxidation(malondialdehyde) and nitric oxide concentrations accompanied with a decrease in brain reduced glutathione, glutathione peroxidase(GPx) activity, total antioxidant capacity(TAC) and glucose concentrations. Paraoxonase-1, acetylcholinesterase(ACh E) and butyrylcholinesterase activities decreased in brain as well. Liver aspartate aminotransferase and alanine aminotransferase activities were raised. The Comet assay showed increased DNA damage of peripheral blood lymphocytes. Histological damage and increased expression of inducible nitric oxide synthase(i NOS) were observed in brain and liver. Citric acid resulted in decreased brain lipid peroxidation and nitric oxide. meanwhile, glutathione, GPx activity, TAC capacity and brain glucose level increased. Brain ACh E increased but PON1 and butyrylcholinesterase activities decreased by citric acid. Liver enzymes, the percentage of damaged blood lymphocytes, histopathological alterations and i NOS expression in brain and liver was decreased by citric acid. meanwhile, rats treated with atropine showed decreased brain mDA, nitrite but increased GPx activity, TAC, ACh E and glucose. The drug also decreased DNA damage of peripheral blood lymphocytes, histopathological alterations and i NOS expression in brain and liver. Conclusions: The study demonstrates a beneficial effect for citric acid upon brain oxidative stress, neuronal injury, liver and DNA damage due to acute malathion exposure.

关键词： Citric acid malathion Oxidative stress Paraoxonase 1 Cholinesterase Comet assay

Thermoluminescence Energy Response of Copper and magnesium Oxide Doped Lithium Potassium Borate Using a monte Carlo N-Particle Code Simulation

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International Journal of medical Physics, Clinical Engineering and Radiation Oncology 2017年第3期6卷 304-312页

作者： Khaled m. Abushab yasser S. Alajerami Sami Alagha Suhairul Hashim Department of medical Radiography Al-Azhar University Gaza Strip Palestine Department of Physics Universiti Teknologi Malaysia Skudai Malaysia

The energy absorption coefficient of Cu-doped lithium potassium borate (LKB) dosimeter and TLD 100 was reported theoretically and checked by simulation of monte Carlo n-particle code version 5 (mCNP5). The response of LKB:Cu for various photon energies (20 keV to 10 meV) were determined by calculation, experiment and simulation. The obtained results were discussed and compared with TLD 100. For more precise results, the geometry specification, the source information, the material information and tallies were identified and fully described. The results obtained by simulation were determined based on the tally F6, which exhibited the response as energy-dependant on heating function instead of flux. The current results showed that the prepared dosimeter has a greater response than TLD 100 in the lower energy range and a flat response in the higher energy ranges (≥100 keV).

关键词： Thermoluminescence mCNP Lithium Potassium Borate Energy Response

Evaluating the influence of 6 mV and 15 mV photon beams on prostate intensity-modulated radiation therapy plans

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Oncology and Translational medicine 2016年第1期2卷 26-33页

作者： Reham A.El Gendy Ehab m.Attalla yasser m.Elkerm Ali Alfarrash Ayadi Al mostakbl 0ncology Center AlexandriaEgypt National Cancer Institute Cairo UniversityCairoEgypt Cancer management and Research Department Medical Research InstituteAlexandria UniversityAlexandriaEgypt Faculty of Science Mansoura UniversityMansouraEgypt

Objective We aimed to determine the ef ects of low- and high-energy intensity-modulated radiation therapy （ImRT） photon beams on the target volume planning and on the critical organs in the case of prostate can-cer. methods Thirty plans were generated by using either 6 mV or 15 mV beams separately, and a combination of both 6 and 15 mV beams. Al plans were generated by using suitable planning objectives and dose con-straints, which were identical across the plans, except the beam energy. The plans were analyzed in terms of their target coverage, conformity, and homogeneity, regardless of the beam energy. Results The mean percentage values of V70 Gy for the rectal wal for the plans with 6 mV, 15 mV, and mixed-energy beams were 16.9%, 17.8%, and 16.4%, respectively, while the mean percentage values of V40 Gy were 53.6%, 52.3%, and 50.4%. The mean dose values to the femoral heads for the 6 mV, 15 mV, and mixed-en-ergy plans were 30.1 Gy, 25.5 Gy, and 25.4 Gy, respectively. The mean integral dose for the 6 mV plans was 10% larger than those for the 15 mV and mixed-energy *** These preliminary results suggest that mixed-energy ImRT plans may be advantageous with respect to the dosimetric characteristics of low- and high-energy beams. Although the reduction of dose to the organs at risk may not be clinical y relevant, in this study, ImRT plans using mixed-energy beams exhibited better OAR sparing and overal higher plan quality for deep-seated tumors.

关键词： intensity-modulated radiation therapy (ImRT) mixed-energy plans 6 mV 15 mV prostate cancer radiation treatment planning dose-volumetric analysis

A Theoretical Study of Light Absorption in Self Assembled Quantum Dots

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Optics and Photonics Journal 2013年第2期3卷 243-247页

作者： Tarek A. Ameen yasser m. El-Batawy A. A. Abouelsaood Department of Engineering Physics and mathematics Faculty of Engineering Cairo University Giza 12613 Egypt

Self assembled quantum dots have shown a great promise as a leading candidate for infrared detection at room temperature. In this paper, a theoretical model of the absorption coefficient of quantum dot devices is presented. Both of bound to bound absorption and bound to continuum absorption are taken into consideration in this model. This model is based on the effective mass theory and the Non Equilibrium Greens Function (NEGF) formalism. NEGF formalism is used to calculate the bound to continuum absorption coefficient. The results of the model have been compared with a published experimental work and a good agreement is obtained. Based on the presented model, the bound to bound absorption coefficient component is compared to the bound to continuum absorption coefficient component. In addition, the effects of the dot dimensions and electron filling on the bound to continuum absorption coefficient are also investigated. In general, increasing the dot filling increases the absorption and decreasing the dots dimensions will increase the absorption and move the absorption peak towards longer wavelengths.

关键词： Absorption Coefficients Non Equilibrium Greens Function Self Assembled Quantum Dots

Amphetamine Versus Non Amphetamine-Related First Episode Psychosis in Saudi Arabian Patients

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Pharmacology & Pharmacy 2011年第3期2卷 101-108页

作者： Ehab Said EL Desoky Ashraf m A El-Tantawy yasser m. Raya Abdulhameed Al-Yahya 不详

Background: Amphetamines are illicit psychostimulant drugs that can induce psychotic symptoms. Very few studies have been conducted in Kingdom of Saudi Arabia (SA) on amphetamine abuse and related psychosis. Recently, the pattern of amphetamine abuse in SA showed a significant trend of increased frequency. Objectives: To investigate the extent of amphetamine abuse in a sample of Saudi patients hospitalized for first episode of acute psychosis. Also, to compare in that sample between amphetamine psychosis and other psychoses regarding demographic data, premorbid personality and symptoms profile. method: 106 patients with acute psychosis were hospitalized and screening of urine for amphetamine was conducted for all. Patients’ psychiatric evaluation included interviewing, and ICD-10 criteria for personality disorders. 30 healthy subjects were also included for comparison with patients. Results: 34/106 of psychotic patients (32%) were positive for amphetamine in urine (≥ 1000 ng/ml). The frequency of personality disorders was significantly higher (P mpared with healthy subjects (6/30;20%). Also, the incidence of personality disorders was significantly higher (P mphetamine positive psychosis (25/34;73.5%) compared with amphetamine negative psychosis (29/72;40%). Cluster B personality disorders particularly the antisocial and borderline were significantly higher in amphetamine positive psychosis (13/34;38%) compared with amphetamine negative psychoses (6/72;8%). The symptom profile showed significant difference between amphetamine positive and amphetamine negative psychosis as regards ideas of reference (50% vs. 14%), suspiciousness (44% vs. 11%), suicidal ideation (38% vs. 23%), paranoid delusions (29% vs. 17%) and increased pulse or blood pressure (29% vs. 7%) respectively. Conclusion: Screening of amphetamine in urine among patients with first episode of acute psychosis can help and support the clinical distinction of

关键词： Amphetamine First Episode Psychosis