检索结果-南通市图书馆

Elemental analysis of some Egyptian ores and industrial iron samples by neutron activation analysis

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 Environmental Sciences 2001年第1期13卷 115-118页

作者： A.Srror N.Abdel Basset A.S.Abdel Haleem A.m.hassan Nuclear Physics Lab. Physics DepartmentFaculty of GirlsAin Shams UniversityCairoEgypt Environmental Radioative Pollution Department Hot Laboratories CentreAEACairoEgypt

Elemental analysis of iron ore samples and first industrial iron production prepared by the Egyptian Iron and Steel Company of Helwan near Cairo were determined by instrumental neutron activation analysis technique. Five samples from each kind were irradiated for a 48 hours at a thermal neutron flux of 4×10 12 n/(cm 2.s) in the first Egyptian research reactor ET RR 1. Also the Pneumatic irradiation Rabbit system (PIRS) attached to the reactor in Inshass, was used to measure the elements of short life time. The gamma ray spectra were recorded by means of the hyper pure germanium detection system. The concentration percentage values of major, minor and trace elements are presented. The long and short lived isotopes were considered. A comparative study and a discussion on the elemental concentration values are given.

关键词： elemental analysis Egyptian iron samples neutron activation analysis

Tannin Nanoparticles(NP99)Enhances the Anticancer Effect of Tamoxifen on ER+Breast Cancer Cells

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable materials 2021年第12期9卷 2077-2092页

作者： Faizah A.Almalki Aziza m.hassan Zeinab m.klaab Soliman Abdulla Antonio Pizzi Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Biotechnology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Physics Faculty of ScienceAlexandria UniversityAlexandriaEgypt ENSTIB-LERmAB University of LorraineEpinal88051France

Recently,natural substances in the form of nanoparticles are increasingly being used in different field,particularly in medicines to enhance their beneficial effects in treatment and *** cells of the breast(mCF-7)have been chosen to be examined and treated in vitro with conventional drug Tamoxifen(Tam)and tannin nanoparticles extract(NP99)individually or in *** reagent has been applied to assess the cell viability and propagation percentage,DNA fragmentation and mRNA relative expression of apoptotic genes to study the cell death *** results showed that Tam and tannin NP99 triggered cytotoxic activity towards the mCF7 *** reduce the viability and induced high potent repressive activity on cell proliferation percentage and induced apoptosis as indicated by rising the percentage in DNA *** of NP99 extract exhibited its effect in a dose and *** combined treatment of Tam and NP99 were much more efficient than individual *** could be concluded that NP99 is considered a promising natural anticancer agent as a new tool in therapeutic strategies.

关键词： Condensed tannin nanoparticles tamoxifen mCF-7 cells anticancer

Search for microglia-specific peptides:advances in the discovery toolbox

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 471-472页

作者： Ivan Sarabia kyle m.koss Department of Surgery University of ArizonaTucsonAZUSA

Uncontrolled and chronic inflammatory states in the central nervous system(CNS)are the hallmark of neurodegenerative pathology and every injury or stroke-related *** key mediators of these neuroinflammatory states are glial cells known as microglia,the resident immune cell at the core of the inflammatory event,and astroglia,which encapsulate inflammatory insults in proteoglycan-rich scar *** gliotic scar blocks significant portions of healthy axonal networking,preventing *** most neuroinflammation is exclusively based on the responses of said microglia,their phenotypes are suggested to follow those of macrophages;m1 and m2 are opposites of pro-and ***,microglial phenotypes have been identified to be on an inflammatory spectrum encompassing developmental,homeostatic,and reparative behaviors as opposed to their ability to affect devastating cell death cascades and scar tissue formation.

关键词： inflammation pathology death

A Genetic Algorithm to Solve Capacity Assignment Problem in a Flow Network

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2020年第9期64卷 1579-1586页

作者： Ahmed Y.hamed monagi H.Alkinani m.R.hassan Department of Computer Science Faculty of Computers and InformationSohag UniversitySohag82524Egypt Department of Computer Science and Artificial Intelligence College of Computer Science and EngineeringUniversity of JeddahJeddah21959Saudi Arabia Department of mathematics and Computer Science Faculty of ScienceAswan UniversityAswan81528Egypt

Computer networks and power transmission networks are treated as capacitated flow networks.A capacitated flow network may partially fail due to ***,the capacity of each edge should be optimally assigned to face critical situations-i.e.,to keep the network functioning normally in the case of failure at one or more *** robust design problem(RDP)in a capacitated flow network is to search for the minimum capacity assignment of each edge such that the network still survived even under the edge’s *** RDP is known as ***,capacity assignment problem subject to system reliability and total capacity constraints is studied in this *** problem is formulated mathematically,and a genetic algorithm is proposed to determine the optimal *** optimal solution found by the proposed algorithm is characterized by maximum reliability and minimum total *** numerical examples are presented to illustrate the efficiency of the proposed approach.

关键词： Flow network capacity assignment network reliability genetic algorithms

UAV-Aided Data Acquisition Using Gaining-Sharing knowledge Optimization Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, materials & Continua 2022年第9期72卷 5999-6013页

作者： Rania m Tawfik Hazem A.A.Nomer m.Saeed Darweesh Ali Wagdy mohamed hassan mostafa Wireless Intelligent Networks Center(WINC) School of Engineering and Applied SciencesNile UniversityGiza12677Egypt School of Information Technology and Computer Science(ITCS) Nile UniversityGiza12677Egypt Operations Research Department Faculty of Graduate Studies for Statistical ResearchCairo UniversityGiza12613Egypt Department of mathematics and Actuarial Science School of Science and EngineeringThe American University in CairoEgypt Electronics and Communications Engineering Department Cairo UniversityEgypt University of Science and Technology Nanotechnology and Nanoelectronics ProgramZewal City of Science and TechnologyOctober Gardens6th of OctoberGiza12578Egypt

Unmanned Aerial Vehicles(UAVs)provide a reliable and energyefficient solution for data collection from the Narrowband Internet of Things(NB-IoT)***,the UAV’s deployment optimization,including locations of the UAV’s stop points,is a necessity to minimize the energy consumption of the UAV and the NB-IoT devices and also to conduct the data collection *** this regard,this paper proposes GainingSharing knowledge(GSk)algorithm for optimizing the UAV’s *** GSk,the number of UAV’s stop points in the three-dimensional space is encapsulated into a single individual with a fixed length representing an entire *** superiority of using GSk in the tackled problem is verified by simulation in seven *** provides significant results in all seven scenarios compared with other four optimization algorithms used before with the same ***,the NB-IoT is proposed as the wireless communication technology between the UAV and IoT devices.

关键词： NB-IoT UAV GSk stop points optimization

Simulation of quantum-well slipping effect on optical bandwidth in transistor laser

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第5期7卷 435-436页

作者： hassan kaatuzian Seyed Iman Taghavi Photonics Research Laboratory Electrical Engineering DepartmentAmirkabir University of Technology

An optical bandwidth analysis of a quantum-well （16 nm） transistor laser with 150-μm cavity length using a charge control model is reported in order to modify the quantum-well location through the base region. At constant bias current, the simulation shows significant enhancement in optical bandwidth due to moving the quantum well in the direction of collector-base junction. No remarkable resonance peak, limiting factor in laser diodes, is observed during this modification in transistor laser structure. The method can be utilized for transistor laser structure design.

关键词： well Simulation of quantum-well slipping effect on optical bandwidth in transistor laser

Ant Colony Optimization for multi-Objective multicast Routing

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2020年第6期63卷 1159-1173页

In the distributed networks,many applications send information from a source node to multiple destination *** support these applications requirements,the paper presents a multi-objective algorithm based on ant colonies to construct a multicast tree for data transmission in a computer *** proposed algorithm simultaneously optimizes total weight(cost,delay and hop)of the multicast *** results prove the proposed algorithm outperforms a recently published multi-objective multicast Algorithm specially designed for solving the multicast routing ***,it is able to find a better solution with fast convergence speed and high reliability.

关键词： multimedia communication multicast routing multicast tree quality of service ant colony

Amelioration of Saline-Sodic Soils with Tillage Implements and Sulfuric Acid Application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2007年第2期17卷 182-190页

作者： m.SADIQ G.hassan S. m. mEHDI N. HUSSAIN m. JAmIL Soil Salinity Research Institute Pindi Bhattian Hafizabad District(Pakistan)

Amelioration of saline-sodic soils through land preparation with three tillage implements （disc plow, rotavator and cultivator） each followed by application of sulfuric acid at 20% of gypsum （CaSO4-2H2O） requirement or no sulfuric acid application during crop growth period was evaluated in a field study for 2.5 years at three sites, i.e., Jhottianwala, Gabrika （Thabal）, and Thatta Langar, in Tehsil Pindi Bhattian, Hafizahad District, Pakistan. Within 2.5 years, there was a decrease in the salinity parameters measured （electrical conductivity, pH, and sodium adsorption ratio）, with a gradual increase in rice and wheat grain yields. It was observed that the disc plow, which not only ensured favorable yields but also helped improve soil health at all the three sites, was the most effective tillage implement. Also, application of sulfuric acid resulted in higher yields and promoted rapid amelioration of the saline-sodic soils.

关键词： amelioration saline-sodic soils salinity parameters sulfuric acid tillage implements

Tectonic evolution of the karakoram metamorphic complex(NW Himalayas)reflected in the 3D structures of spiral garnets:Insights from X-ray computed micro-tomography

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第3期12卷 528-540页

作者： m.Sayab D.Aerden J.kuva W.U.hassan Geological Survey of Finland P.O.Box 96FI-02151 EspooFinland Departamento de Geodinámica and IACT-CSIC Universidad de GranadaGranada 18002Spain National Centre of Excellence in Geology University of PeshawarPeshawar 25130Pakistan

Spiral garnet porphyroblasts are known to record lengthy periods of deformation and metamorphism by preserving single or multiple FIAs(Foliation Intersection Axis)formed normal to tectonic shortening *** to technological advances in X-ray computed micro-tomography(XCmT),FIAs can now be readily determined in relatively large samples in contrast to previous methods that require the preparation of a set of radial vertical and horizontal thin sections of *** scanning not only alleviates tedious thin section based procedures but also illuminates the complete internal architecture of a rock sample allowing three-dimensional(3D)quantitative shape analysis of an individual porphyroblast as well as precise measurement of *** applied the technique to a sample from the Hunza Valley in the karakoram metamorphic complex(kmC),NW Himalayas,containing numerous garnet porphyroblasts with spiral-shaped inclusion *** XCmT imaging reveals an E-W trending FIA within the sample,which is consistent with orthogonal N-S collision of the India-kohistan Island Arc with *** long axes(X_(GT))have variable plunges that define a broad sub-vertical maximum and a small sub-horizontal *** X_(GT) principle maxima lie at N-090 and *** maxima lie at N-020 and *** relationships between X_(GT) axes and FIA orientation in the sample suggest that porphyroblast shapes are controlled by the geometry of the lens-shaped microlithons in which they tend to nucleate and *** orientation of inclusion trails and matrix foliations in the sample are correlated with three discrete tectono-metamorphic events that respectively produced andalusite,sillimanite and kyanite in the *** staurolite growth in the sample reveals how the rocks extruded to the surface via a significant role of roll-on tectonics,which can be correlated with the Central Himalayas.

关键词： Porphyroblast Garnet FIA X-ray tomography karakoram Himalayas