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Novel miniature pneumatic pressure regulator for hopping robots

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Journal of Beijing Institute of Technology 2015年第1期24卷 42-48页

作者： SAMO Saifullah 马树元 sameh Bdran School of Mechanical Engineering Beijing Institute of Technology

A novel miniature pressure regulator is fabricated and studied. The regulator can easily be integrated into portable mechatronics or miniature robotic applications because of its lightweight and compact size. An especial poppet is designed to minimize its size and to withstand high-pressure. The pressure regulator is designed for a hopping robot which is powered by a combustion system. The hopping robot has great moving capacities such as jumping over big obstacles, wails and dit- ches. The regulator helps the hopping robot to decrease size and weight, and to sustain high pres- sure of oxygen and fuel tank. It will maintain constant output pressure to obtain suitable proportion of oxygen and fuel in the combustion cylinder. Dynamic simulation of the miniature pneumatic pres- sure regulator is performed. Experiments on prototype of miniature pneumatic pressure regulator are also carried out to validate the performance and satisfied performance is obtained.

关键词： hopping robot poppet valve pneumatic pressure regulator pressure control

Functional Analysis of the Genotypic Differences in Response of Pea (Pisum sativum L.) to Calcareous-Induced Iron Deficiency

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Phyton-International Journal of Experimental Botany 2023年第2期92卷 521-536页

作者： sameh Barhoumi Hasna Ellouzi Abdelmajid Krouma Laboratory of Ecosystems and Biodiversity in Arid Land of Tunisia Faculty of SciencesUniversity of SfaxSfax3000Tunisia Centre of Biotechnology of Borj Cedria Hammam Lif2050Tunisia Faculty of Sciences and Techniques University of KairouanKairouan9100Tunisia

Lime-induced iron chlorosis is a major nutritional disorder causing severe plant growth and yield reduction in the calcareous soils of *** understanding the behavior of key metabolic functions of peas on calcareous soils,the identification of useful traits of tolerance,and the exploration of the genotypic differences in response to this constraint remain the most efficient approaches due to their coast,environmental benefits,and *** this purpose,a greenhouse experiment was conducted on three pea genotypes(Alexandra:Alex,Douce de provence:DP,and Merveille de Kelvedon:MK)cultivated on calcareous soil(Fe-deficient)and fertile soil(control).Plant growth,SPAD index,iron nutrition and distribution,photosynthesis,and antioxidant enzymes were deeply analyzed to discriminate genotypic ***-induced iron deficiency reduced SPAD index,plant growth,net photosynthesis,and tissue Fe content against a significant stimulation of the oxidative stress indicators,H2O2 and Malondialdehyde(MDA).Moreover,we reported a significant induction of SOD and CAT activity in shoots and roots of the Alexandra *** use efficiency increased on calcareous soil and clearly discriminated the studied *** genotype was found to be the most tolerant to lime-induced iron *** genotype protects its tissues against oxidative stress by stimulating enzyme activities(SOD and CAT)and develops significant efficiency of Fe uptake,translocation to shoots and use when cultivated on calcareous soil.

关键词： Calcareous-induced Fe deficiency catalase Fe use efficiency photosynthesis superoxide dismutase

Right Axillary Thoracotomy Should Be the Standard of Care for Repair of Non-Complex Congenital Heart Defects in Infants and Children

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Congenital Heart Disease 2024年第4期19卷 407-417页

作者： sameh M.Said Yasin Essa Division of Pediatric and Adult Congenital Cardiac Surgery Department of SurgeryMaria Fareri Children’s HospitalWestchester Medical CenterNew York Medical CollegeNew YorkNY 10595USA Department of Cardiothoracic Surgery Faculty of MedicineAlexandria UniversityAlexandria5372066Egypt

Minimally invasive approaches for cardiac surgery in children have been lagging in comparison to the adult world.A wide range of the most common congenital heart defects in infants and children can be repaired suc-cessfully through a variety of non-sternotomy *** has been shown to be associated with superior cos-metic results,shorter hospital stays,and rapid return to full activity compared to *** approaches have been around for decades,but they have not been widely adopted for a variety of *** axillary thor-acotomy is one of these approaches that we believe should be the new standard for the repair of a wide variety of heart defects in children and will be the focus of our current review.

关键词： Minimally invasive repair congenital heart disease right axillary thoracotomy atrial septal defect ventricular septal defect enhanced recovery

Peristaltic Flow of Dusty Nanofluids in Curved Channels

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Computers, Materials & Continua 2021年第1期66卷 1011-1026页

作者： Z.Z.Rashed sameh E.Ahmed mathematics department jouf universityqurayyatsaudi arabia department of mathematics king khalid universityabhasaudi arabia

In this paper,numerical investigations for peristaltic motion of dusty nanofluids in a curved channel are *** systems of partial differential equations are presented for the nanofluid and dusty phases and then the approximations of the long wave length and low Reynolds number are *** physical domain is transformed to a rectangular computational model using suitable grid *** resulting systems are solved numerically using shooting method and mathematical forms for the pressure distributions are *** controlling parameters in this study are the thermal buoyancy parameter G_(r),the concentration buoyancy parameter Gc,the amplitude ratio,the Eckert number Ec,the thermophoresis parameter N_(t) and the Brownian motion parameter Nb and the dusty parameters D_(s);α_(s).The obtained results revealed that an increase in the Eckert number enhances the temperature of the fluid and dusty particles while the nanoparticle volume fraction is ***,both of the temperature and nanoparticles volume fraction are supported by the growing of the Brownian motion parameter.

关键词： Peristaltic motion dusty particles nanofluid curved channels

Non-operative management of rectal cancer: Highlighting the controversies

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World Journal of Gastrointestinal Surgery 2024年第6期16卷 1501-1506页

作者： sameh Hany Emile Anjelli Wignakumar Department of Colorectal Surgery Cleveland Clinic FloridaWestonFL 33331United States

There remains much ambiguity on what non-operative management(NOM)of rectal cancer truly entails in terms of the methods to be adopted and the best algorithm to *** is clearly shown by the discordance between various national and international guidelines on NOM of rectal *** main aim of the NOM strategy is organ preservation and avoiding unnecessary surgical in-tervention,which carries its own risk of morbidity.A highly specific and sensitive surveillance program must be devised to avoid patients undergoing unnecessary surgical *** many studies,NOM,often interchangeably called the Watch and Wait strategy,has been shown as a promising treatment option when undertaken in the appropriate patient population,where a clinical complete res-ponse is ***,there are no clear guidelines on patient selection for NOM along with the optimal method of surveillance.

关键词： Non-operative Management Rectal cancer Highlighting Controversies

A Robust Tuned Random Forest Classifier Using Randomized Grid Search to Predict Coronary Artery Diseases

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Computers, Materials & Continua 2023年第5期75卷 4633-4648页

作者： sameh Abd El-Ghany A.A.Abd El-Aziz Department of Information Systems College of Computer and Information SciencesJouf UniversityKSA Department of Information Systems Faculty of Computers and InformationMansoura UniversityEgypt Department of Information Systems and Technology Faculty of Graduate Studies for Statistical ResearchCairo UniversityEgypt

Coronary artery disease(CAD)is one of themost authentic cardiovascular afflictions because it is an uncommonly overwhelming heart *** breakdown of coronary cardiovascular disease is one of the principal sources of death all over *** deterioration is a challenge,especially in youthful and rural countries where there is an absence of humantrained *** heart diseases happen without apparent signs,high-level detection is *** paper proposed a robust and tuned random forest model using the randomized grid search technique to *** proposed framework increases the ability of CADpredictions by tracking down risk pointers and learning the confusing joint efforts between ***,the healthcare industry has a lot of data but needs to gain more *** proposed framework is used for extracting knowledge from data stores and using that knowledge to help doctors accurately and effectively diagnose heart disease(HD).We evaluated the proposed framework over two public databases,Cleveland and Framingham *** datasets were preprocessed by using a cleaning technique,a normalization technique,and an outlier detection ***,the principal component analysis(PCA)algorithm was utilized to lessen the feature dimensionality of the two ***,we used a hyperparameter tuning technique,randomized grid search,to tune a random forest(RF)machine learning(ML)*** randomized grid search selected the best parameters and got the ideal CAD *** proposed framework was evaluated and compared with traditional *** proposed framework’s accuracy,sensitivity,precision,specificity,and f1-score were 100%.The evaluation of the proposed framework showed that it is an unrivaled perceptive outcome with tuning as opposed to other ongoing existing frameworks.

关键词： Coronary artery disease tuned random forest randomized grid search classifier

Cellular therapy:A promising tool in the future of colorectal surgery

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World Journal of Gastroenterology 2019年第13期25卷 1560-1565页

作者： Mohammed Mohammed El-Said sameh Hany Emile Colorectal Surgery Unit General Surgery Department Mansoura University Hospitals Mansoura University

Cellular therapy may be the solution of challenging problems in colorectal surgery such as impaired healing leading to anastomotic leakage and metastatic colorectal cancer(CRC). This review aimed to illustrate the role of cellular therapy in promotion of wound healing and management of metastatic CRC. An organized literature search for the role of cellular therapy in promotion of wound healing and management of metastatic CRC was conducted. Electronic databases including PubMed/Medline, Scopus, and Embase were queried for the search process. Two types of cellular therapy have been recognized, the mesenchymal stem cells(MSCs) and bone marrow-mononuclear cells(BM-MNCs) *** cells have been shown to accelerate and promote healing of various tissue injuries in animal and human studies. In addition, experimental studies have reported that MSCs may help suppress the progression of colon cancer in rat models. This article reviews the possible mechanisms of action and clinical utility of MSCs and BM-MNCs in promotion of healing and suppression of tumor growth in light of the published literature. Cellular therapy has a potentially important role in colorectal surgery, particularly in the promotion of wound healing and management of metastatic CRC. Future directions of cellular therapy in colorectal surgery were explored which may help stimulate futures studies on the role of cellular therapy in colorectal surgery.

关键词： Cellular therapy Future Colorectal surgery Stem cells

A Two-Layer Model for Superposed Electrified Maxwell Fluids in Presence of Heat Transfer

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Communications in Theoretical Physics 2011年第6期55卷 1077-1094页

作者： Kadry Zakaria Magdy A. Sirwah sameh A. Alkharashi Department of Mathematics Faculty of ScienceTanta University

Based on a modified-Darcy-Maxwell model, two-dimensional, incompressible and heat transfer flow of two bounded layers, through electrified Maxwell fluids in porous media is performed. The driving force for the instability under an electric field, is an electrostatic force exerted on the free charges accumulated at the dividing interface. Normal mode analysis is considered to study the linear stability of the disturbances layers. The solutions of the linearized equations of motion with the boundary conditions lead to an implicit dispersion relation between the growth rate and wave number. These equations are parameterized by Weber number, Reynolds number, Marangoni number, dimensionless conductivities, and dimensionless electric potentials. The case of long waves interfaciaJ stability has been studied. The stability criteria are performed theoreticaily in which stability diagrams are obtained. In the limiting cases, some previously published results can be considered as particular cases of our results. It is found that the Reynolds number plays a destabilizing role in the stability criteria, while the damping influence is observed for the increasing of Marangoni number and Maxwell relaxation time.

关键词： modified-Darcy-Maxwell model two layers stability heat transfer surface charges porous media

Optoelectronic devices informatics: optimizing DSSC performance using random-forest machine learning algorithm

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Optoelectronics Letters 2022年第3期18卷 148-151页

作者： Omar Al-Sabana sameh O.Abdellatif Electrical Engineering Department Faculty of Engineering and FabLab in the Centre for Emerging Learning Technology(CELT)The British University in EgyptCairo 11387Egypt

This paper provides an attempt to utilize machine learning algorithm,explicitly random-forest algorithm,to optimize the performance of dye sensitized solar cells(DSSCs)in terms of conversion *** optimization is implemented with respect to both the mesoporous TiO_(2) active layer thickness and ***,the porosity impact is reflected to the model as a variation in the effective refractive index and dye *** set has been established using our data in the literature as well as numerical data extracted from our numerical *** random-forest model is used for model regression,prediction,and optimization,reaching 99.87%*** agreement with experimental data was observed,with 4.17%conversion efficiency.

关键词： porosity performance algorithm