检索结果-南通市图书馆

PERIODIC mOTIONS OF SPINNING RIGID SPACECRAFT UNDER INFLUENCE OF GRAVITATIONAL AND mAGNETIC FIELDS

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2006年第8期27卷 1061-1069页

作者： Yehia A.Abdel-aziz m.H.Yehia F.A.Abd El-Salam m.radwan National Research Institute of Astronomy and Geophysics Helwan. Cairo Egypt mathematics Department Faculty of Science Mansoura University MansouraEgypt Astronomy Department Faculty of ScienceCairo UniversityCairo12613Egypt

The motion of a magnetized axisymmetric spacecraft about its center of mass in a circular orbit is considered, taking the gravitational and magnetic effects of the central body into account. Equations of motion of the reduced system are transformed to equations of plane motion of a charged particle under the action of electric and magnetic fields. Stationary motions of the system are determined and periodic motions near to them are constructed using the Lyapounoff theorem of the holomorphic integral.

关键词： periodic motions routhian rigid spacecraft

Biological and molecular studies on specific immune cells treated with checkpoint inhibitors for the thera-personal approach of breast cancer patients(ex-vivo study)

在线全文

学校读者我要写书评

暂无评论

Oncology Research 2021年第5期29卷 319-330页

作者： mOTAWA E.EL-HOUSEINI mOSTAFA S.ARAFAT AHmED m.EL-HUSSEINY ISLAm m.KASEm mAHmOUD m.KAmEL AHmED H.EL-HABASHY mEDHAT m.KHAFAGY ENAS m.radwan mAHA H.HELAL mONA S.ABDELLATEIF medical Biochemistry and molecular Biology Cancer Biology DepartmentNational Cancer InstituteCairo UniversityCairo11976Egypt Biotechnology Department Faculty of ScienceCairo UniversityGiza12613Egypt Zoology department Faculty of ScienceCairo UniversityGiza12613Egypt Clinical Pathology Department National Cancer InstituteCairo UniversityCairo11976Egypt Department of Pathology National Cancer InstituteCairo UniversityCairo11976Egypt Surgical Oncology Department National Cancer InstituteCairo UniversityCairo11976Egypt Radio-Diagnosis Department National Cancer InstituteCairo UniversityCairo11976Egypt

Immunotherapy becomes a promising line of treatment for breast cancer(BC)however,its success rate is still ***:The study was designed to optimize the condition for producing an effective dendritic cell(DCs)based immunotherapy by using DCs and T lymphocytes together with tumor-inﬁltrating lymphocytes(TILs)and tumor-inﬁltrating DCs(TIDCs),treated with anti-PD1 and anti-CTLA4 monoclonal *** mixture of immune cells was co-cultured with autologous breast cancer cells(BCCs)isolated from 26 BC ***:There was a signiﬁcant upregulation of CD86 and CD83 on DCs(p=0.001 and 0.017,respectively),similarly upregulation of CD8,CD4 and CD103 on T cells(p=0.031,0.027,and 0.011,respectively).While there was a signiﬁcant downregulation of FOXP3 and combined ***8 expression on regulatory T cells(p=0.014 for both).Increased CD8/Foxp3 ratio(pmmed cell death ligand 1(PDL-1)were downregulated in BCCs(pmilarly cytotoxic T lymphocyte antigen-4(CTLA4,p=0.02),Programmed cell death 1(PD-1,pmmune cells(DCs,T cells,TIDCs,and TILs)with immune checkpoint inhibitors could produce a potent and effective BC ***,these data should be validated on an experimental animal model to be transferred to the clinical setting.

关键词： Immunotherapy breast cancer PD1 CTLA4 TIDCs TILs

Astragalus kahiricus根提取物对乙醇诱导的大鼠肝细胞凋亡的肝保护作用(英文)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国天然药物 2013年第4期11卷 354-361页

作者： Rasha m.Allam Dina A.Selim Asser I.Ghoneim mohamed m.radwan Salwa m.Nofal Amani E.Khalifa Ola A.Sharaf Soad m.Toaima Aya m.Asaad Nadia A.El-Sebakhy Pharmacology Department Medical DivisionNational Research CenterGizaEgypt Department of Pharmacognosy Faculty of PharmacyThe University of AlexandriaAlexandria 21521Egypt Department of Pharmacology and Toxicology Faculty of PharmacyDamanhour UniversityDamanhourEgypt Department of Pharmacology & Therapeutics Faculty of PharmacyBeirut Arab UniversityBeirutLebanon National Center for Natural Products Research School of PharmacyThe University of MississippiUniversity 38677 MSUSA Department of Pharmacology and Toxicology Faculty of PharmacyAin Shams UniversityCairoEgypt

The hepatoprotective activity of the ethanol extract of Astragalus kahiricus(Fabaceae) roots against ethanol-induced liver apoptosis was evaluated and it showed very promising hepatoprotective actions through different *** extract counteracted the ethanol-induced liver enzymes leakage and glutathione *** addition,it demonstrated anti-apoptotic effects against caspase-3 activation and DNA fragmentation that were confirmed by liver histopathological ***,the phytochemical study of this extract led to the isolation of four cycloartane-type triterpenes identified as astrasieversianin II(1),astramembrannin II(2),astrasieversianin XIV(3),and cycloastragenol(4).The structures of these isolates were established by HRESI-mS and 1D and 2D NmR *** antimicrobial,antimalarial,and cytotoxic activities of the isolates were further evaluated,but none of them showed any activity.

关键词：实验药理学药理病理作用天然药物

On multi-Granulation Rough Sets with Its Applications

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2024年第4期79卷 1025-1038页

作者： radwan Abu-Gdairi R.mareay m.Badr Department of mathematics Faculty of ScienceZarqa UniversityZarqa13132Jordan Department of mathematics Faculty of ScienceKafrelsheikh UniversityKafrelsheikh33516Egypt Department of mathematics Faculty of ScienceNew Valley UniversityEl Kharga72713Egypt

Recently,much interest has been given tomulti-granulation rough sets (mGRS), and various types ofmGRSmodelshave been developed from different viewpoints. In this paper, we introduce two techniques for the classificationof mGRS. Firstly, we generate multi-topologies from multi-relations defined in the universe. Hence, a novelapproximation space is established by leveraging the underlying topological structure. The characteristics of thenewly proposed approximation space are *** introduce an algorithmfor the reduction ***, a new approach for the classification ofmGRS based on neighborhood concepts is introduced. Finally, areal-life application from medical records is introduced via our approach to the classification of mGRS.

关键词： multi-granulation rough sets data classifications information systems interior operators closure operators approximation structures

machine learning and data-driven prediction of pore pressure from geophysical logs:A case study for the mangahewa gas field,New Zealand

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock mechanics and Geotechnical Engineering 2022年第6期14卷 1799-1809页

作者： Ahmed E.radwan David A.Wood Ahmed A.radwan Faculty of Geography and Geology Institute of Geological SciencesJagiellonian UniversityKraków30-387Poland Exploration Department Gulf of Suez Petroleum CompanyCairoEgypt DWA Energy Limited LincolnUK Department of Geology Faculty of ScienceAl-Azhar UniversityAssiut BranchAssiut71524Egypt

Pore pressure is an essential parameter for establishing reservoir conditions,geological interpretation and drilling *** pressure prediction depends on information from various geophysical logs,seismic,and direct down-hole pressure ***,a level of uncertainty accompanies the prediction of pore pressure because insufficient information is usually recorded in many *** machine learning(mL)algorithms can decrease the level of uncertainty of pore pressure prediction uncertainty in cases where available information is *** this research,several mL techniques are applied to predict pore pressure through the over-pressured Eocene reservoir section penetrated by four wells in the mangahewa gas field,New *** predictions substantially outperform,in terms of prediction performance,those generated using a multiple linear regression(mLR)*** geophysical logs used as input variables are sonic,temperature and density logs,and some direct pore pressure measurements were available at the reservoir level to calibrate the predictions.A total of 25,935 data records involving six well-log input variables were evaluated across the four *** mL methods achieved credible levels of pore pressure prediction *** most accurate models for predicting pore pressure in individual wells on a supervised basis are decision tree(DT),adaboost(ADA),random forest(RF)and transparent open box(TOB).The DT achieved root mean square error(RmSE)ranging from 0.25 psi to 14.71 psi for the four *** trained models were less accurate when deployed on a semi-supervised basis to predict pore pressure in the other *** two wells(mangahewa-03 and mangahewa-06),semi-supervised prediction achieved acceptable prediction performance of RmSE of 130—140 psi;while for the other wells,semi-supervised prediction performance was reduced to RmSE>300 *** results suggest that these models can be used to predict pore pressure in nearby locat

关键词： machine learning(mL) Pore pressure Overburden Well-log derived predictions Overpressure

Design Engineering,Synthesis Protocols,and Energy Applications of mOF-Derived Electrocatalysts

在线全文

学校读者我要写书评

暂无评论

Nano-micro Letters 2021年第9期13卷 16-47页

作者： Amr radwan Huihui Jin Daping He Shichun mu School of Science Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China State Key Laboratory of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China

The core reactions for fuel cells,rechargeable metal-air batteries,and hydrogen fuel production are the oxygen reduction reaction(ORR),oxygen evolution reaction(OER),and hydrogen evolution reaction(HER),which are heavily dependent on the efficiency of *** attempts have previously been devoted in non-noble electrocatalysts born out of metal-organic frameworks(mOFs)for ORR,OER,and HER applications,due to the following advantageous reasons:(i)The significant porosity eases the electrolyte diffusion;(ii)the supreme catalyst-electrolyte contact area enhances the diffusion efficiency;and(iii)the electronic conductivity can be extensively increased owing to the unique construction block subunits for mOFs-derived ***,the recent progress of mOFs-derived electrocatalysts including synthesis protocols,design engineering,DFT calculations roles,and energy applications is discussed and *** can be concluded that the elevated ORR,OER,and HER performances are attributed to an advantageously well-designed high-porosity structure,significant surface area,and plentiful active ***,the perspectives of mOF-derived electrocatalysts for the ORR,OER,and HER are presented.

关键词： mOF-derived electrocatalysis Oxygen reduction reaction Oxygen evolution reaction Hydrogen evolution reaction

A peer-to-peer logic environment to validate flashing yellow arrow decision support system

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2021年第5期8卷 735-750页

作者： Hatem Abou-Senna Essam.radwan Hesham Eldeeb Center for Advanced Transportation Systems Simulations(CATSS) Department of CivilEnvironmental and Construction Engineering(CECE)University of Central FloridaOrlandoFL 32816USA Deep Numerics LLC.OrlandoFL 32820USA

The flashing yellow arrow(FYA)signal display creates an opportunity to enhance the leftturn phase with a variable mode that can be changed on *** research develops an integrated general purpose data collection module that time stamps detector and phase state changes within a National Electrical manufacturers Association(NEmA)actuated traffic signal controller to provide recommendations for the flashing yellow arrow left-turn mode on a cycle-by-cycle basis.115 left-turn approaches at 38 intersections with locations across the State of Florida were analyzed totaling 1370 h of video data processed including off-peak and peak *** data extraction was an essential step in developing thegap thresholds for the permissive *** intersection field data were obtained through loop detector mapping to the controller in the lab in real-time mode using a peerto-peer logic environment.A custom communications software was developed to retrieve instantaneous channel input data,synchronize opposing through green phase,analyze traffic information,provide the algorithm decision,and generate a real-time log recording the events to determine whether it would be optimal to switch the red arrow to a flashing yellow *** algorithm determines the time interval between the successive arrivals of vehicles and computes the corresponding headway for each lane by cycle on a secondby-second ***-to-peer logic is a necessary step to verify and validate new traffic concepts prior to field-testing and offers the advantage of acquiring and analyzing realtime traffic data coupled with video feed with the benefit of a safe environment.

关键词： Traffic engineering Peer-to-peer logic Flashing yellow arrow Decision support system Permissive left-turn Four section head

Nonlinear forced vibration in a subcritical regime of a porous functionally graded pipe conveying fluid with a retaining clip

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2025年第1期46卷 101-122页

作者： m.GHOLAmI m.EFTEKHARI Department of mechanical Engineering Shahid Bahonar University of Kerman

This study examines the nonlinear behaviors of a clamped-clamped porous pipe made of a functionally graded material(FGm) that conveys fluids and is equipped with a retaining clip, focusing on primary resonance and subcritical dynamics. The nonlinear governing equations for the FGm pipe are derived by the extended Hamilton's principle, and subsequently discretized through the application of the Galerkin *** direct method of multi-scales is then used to solve the derived equations. A thorough analysis of various parameters, including the clip stiffness, the power-law index, the porosity, and the clip location, is conducted to gain a comprehensive understanding of the system's nonlinear dynamics. Through the analysis of the first natural frequency, the study highlights the influence of the flow velocity and the clip stiffness, while the comparisons with metallic pipes emphasize the role of FGm composition. The examination of the forced response curves reveals saddle-node bifurcations and their dependence on parameters such as the detuning parameter and the power-law index, offering valuable insights into the system's nonlinear resonant behavior. Furthermore, the frequency-response curves illustrate the hardening nonlinearities influenced by factors such as the porosity and the clip stiffness, revealing nuanced effects on the system response and resonance characteristics. This comprehensive analysis enhances the understanding of nonlinear behaviors in FGm porous pipes with a retaining clip, providing key insights for practical engineering applications in system design and optimization.

关键词：

AN EVALUATION OF INDOOR ENVIRONmENTAL QUALITY AND OCCUPANT WELL-BEING IN mANITOBA SCHOOL BUILDINGS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Green Building 2017年第1期12卷 123-141页

作者： Ahmed radwan mohamed H.Issa Faculty of Engineering Department of Civil EngineeringUniversity of ManitobaRoom E1-368A EITC15 Gillson StreetWinnipegMB R3T 5V6 Canada Faculty of Engineering Department of Civil EngineeringUniversity of Manitoba Room E3-589 EITC15 Gillson StreetWinnipegMB R3T 5V6Canada

This exploratory research aims to evaluate indoor environmental quality in the classrooms of three school buildings in Southern manitoba,Canada,and to evaluate the well-being of these schools’teachers as it pertains to their perception of their classrooms’indoor *** schools include a middle-aged,conventional school;a new,non-green school;and a new,green school certified using the Leadership in Energy and Environmental Design rating *** methodology involved using a mobile instrument cart to conduct snapshot measurements of thermal comfort,indoor air quality,lighting and acoustics in classrooms and an occupant survey to evaluate teachers’long-term satisfaction with their classrooms’indoor environmental *** results showed that the new,green and new,non-green schools’classrooms performed better than the conventional,middle-aged school’s classrooms with respect to some aspects of thermal comfort and indoor air quality *** in the new,green school and in the new,non-green school were more satisfied than teachers in the conventional,middle-aged school with their classrooms’overall indoor environmental quality,lighting quality and indoor air ***,the new,green and new-non green school classrooms’performance were very comparable with the new,green school’s classrooms performing statistically significantly better with respect to relative ***,none of the differences in teachers’satisfaction ratings between the new,green and new,non-green school were statistically significant.

关键词： building performance evaluation post occupancy evaluation indoor environment building energy use