检索结果-南通市图书馆

The Effect of Relaxation Time on the Heat Transfer and Temperature Distribution in Tissues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Mechanics 2011年第6期1卷 283-287页

作者： mohamed I. A. Othman mohamed Galal Sayed Ali roushdi mohamed farouk 不详

A normal mode analysis for characterizing the temperature fluctuation in tissues was proposed based on the Penne’s bio-heat transfer equation. Closed-form analytical solutions to obtain the heating pattern due to the propagation of ultrasonic waves in tissue system are presented. The evaluation of temporal and spatial distributions of temperature is investigated with the effect of relaxation time. The derived method is evaluated with numerical simulations in 2D which are applied to tissue medium in simplified geometry.

关键词： Natural Asset Financial Value Neural Network

An amorphous FeMoO_(4) nanorod array enabled high-efficiency oxygen evolution electrocatalysis in alkaline seawater

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2270-2275页

作者： Jie Tang Shengjun Sun Xun He Hui Zhang Chaoxin Yang Min Zhang Meng Yue Hefeng Wang Yuntong Sun Yonglan Luo Sulaiman Alfaifi Asmaa farouk mohamed S.Hamdy Xuping Sun Huiqing Wang Binwu Ying Department of Laboratory Medicine West China HospitalSichuan UniversityChengdu 610041China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Chemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityAbha 61413Saudi Arabia Medical Simulation Centre West China Second University HospitalSichuan UniversityChengdu 610041China

The development of highly efficient and durable oxygen evolution reaction(OER)catalysts for seawater electrolysis is of great importance for ***,an amorphous FeMoO_(4) nanorod array on Ni foam is reported as a highly active OER electrocatalyst in alkaline seawater,requiring only overpotentials of 303 and 332 mV to achieve 100 and 300 mA·cm^(-2),***,it shows strong long-term electrochemical durability for at least 50 h.

关键词： amorphous material FeMoO_(4) nanorod array electrocatalyst seawater electrolysis oxygen evolution reaction

Cauliflower-like Ni_(3)S_(2) foam for ultrastable oxygen evolution electrocatalysis in alkaline seawater

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第8期17卷 6820-6825页

作者： Qiuying Dai Xun He Yongchao Yao Kai Dong Xuwei Liu Xiankun Guo Jie Chen Xiaoya Fan Dongdong Zheng Yongsong Luo Shengjun Sun Luming Li Wei Chu Asmaa farouk mohamed SHamdy Xuping Sun Bo Tang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Institute for Advanced Study Chengdu UniversityChengdu 610106China Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 900461413 AbhaSaudi Arabia Center for High Altitude Medicine West China HospitalSichuan UniversityChengdu 610041China Laoshan Laboratory Qingdao 266237China

It is of great importance to design and develop electrocatalysts that are both long-lasting and efficient for seawater ***,a three-dimensional porous cauliflower-like Ni_(3)S_(2) foam on Ni foam(Ni_(3)S_(2) foam/NF)is proposed as a high-performance electrocatalyst for the oxygen evolution reaction in alkaline *** as-synthesis Ni_(3)S_(2) foam/NF achieves exceptional efficacy,achieving a current density of 100 mA·cm^(−2)at mere overpotential of 369 ***,its electrocatalytic stability extends up to 1000 h at 500 mA·cm^(−2).

关键词： Ni_(3)S_(2)foam oxygen evolution reaction seawater electrolysis electrocatalyst

Combining Committee-Based Semi-Supervised Learning and Active Learning

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 Computer Science & Technology 2010年第4期25卷 681-698页

作者： mohamed farouk Abdel Hady Friedhelm Schwenker Institute of Neural Information Processing University of Ulm

Many data mining applications have a large amount of data but labeling data is usually difficult, expensive, or time consuming, as it requires human experts for annotation. Semi-supervised learning addresses this problem by using unlabeled data together with labeled data in the training process. Co-Training is a popular semi-supervised learning algorithm that has the assumptions that each example is represented by multiple sets of features （views） and these views are sufficient for learning and independent given the class. However, these assumptions axe strong and are not satisfied in many real-world domains. In this paper, a single-view variant of Co-Training, called Co-Training by Committee （CoBC） is proposed, in which an ensemble of diverse classifiers is used instead of redundant and independent views. We introduce a new labeling confidence measure for unlabeled examples based on estimating the local accuracy of the committee members on its neighborhood. Then we introduce two new learning algorithms, QBC-then-CoBC and QBC-with-CoBC, which combine the merits of committee-based semi-supervised learning and active learning. The random subspace method is applied on both C4.5 decision trees and 1-nearest neighbor classifiers to construct the diverse ensembles used for semi-supervised learning and active learning. Experiments show that these two combinations can outperform other non committee-based ones.

关键词： data mining classification active learning co-training semi-supervised learning ensemble learning randomsubspace method decision tree nearest neighbor classifier

New model for standpipe pressure prediction while drilling using Group Method of Data Handling

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Petroleum 2022年第2期8卷 210-218页

作者： mohamed Riad Youcefi Ahmed Hadjadj farouk Said Boukredera Laboratory of Petroleum Equipment’s Reliability and Materials Faculty of Hydrocarbons and ChemistryUniversity M’hamed Bougara of BoumerdesAvenue de l’Independance35000BoumerdesAlgeria

The continuous evaluation of the measured Stand Pipe Pressure(SPP)against a modeled SPP value in real-time involves the automatic detection of undesirable drilling events such as drill string washouts and mud pump *** theoretical and experimental studies have been established to calculate the friction pressure losses using different rheological models and based on an extension of pipe flow correlations to an annular ***,it would not be feasible to employ these models for real-time applications since they are limited to some conditions and intervals of application and require input parameters that might not be available in real-time on each *** this study,The Group Method of Data Handling(GMDH)is applied to develop a trustworthy model that can predict the SPP in real-time as a function of mud flow,well depth,RPM and the Fan VG viscometer reading at 600 and 300 *** order to accomplish the modeling task,3351 data points were collected from two wells from Algerian *** and statistical assessment criteria disclosed that the model predictions are in excellent agreement with the experimental data with a coefficient of determination of 0.9666 and an average percent relative error less than 2.401%.Furthermore,another dataset(1594 data points)from well-3 was employed to validate the developed correlation for *** obtained results confirmed that the proposed GMDH-SPP model can be applied in real-time to estimate the SPP with high ***,it was found that the proposed GMDH correlation follows the physically expected trends with respect to the employed input ***,the findings of this study can help for the early detection of downhole problems such as drill string washout,pump failure,and bit balling.

关键词： Stand pipe pressure GMDH Drilling Mud flow Real-time monitoring Drill string washouts

Experimental evaluation of eco-friendly flocculants prepared from date palm rachis

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第10期22卷 1539-1543页

作者： Ramzi Khiari Sonia Dridi-Dhaouadi Chadlia Aguir mohamed farouk Mhenni Research Unity of Applied Chemistry & Environment Department of Chemistry

Sodium carboxymethylcellulose （CMCNa） is an anionic water soluble polyelectrolyte widely used in many industrial sectors including food, textiles, papers, adhesives, paints, pharmaceuticals, cosmetics and mineral processing. CMCNa was produced by chemical modification of cellulose, and represents many advantages： natural, renewable, non-toxic and biodegradable. In this study, different kinds of CMCNa, prepared from an agricultural waste date palm rachis, were tested as eco-friendly flocculants for drinking water treatment and their performances as flocculants in turbidity removal enhancement were assessed. The prepared materials were characterized by the degree of substitution （DS） and polymerisation （DP）. The study of the effect of some experimental parameters on the coagulation-flocculation performance, using the prepared materials combined with aluminium sulphate （as coagulant）, showed that the best conditions for turbidity treatment were given for pH 8, coagulant dose 20 mg/L, flocculant concentration of 100 mg/L and stirring velocity （during the flocculation step） of 30 r/min. Under the optimum conditions, the turbidity removal using CMCNa, prepared from raw material, was about 95%. A comparison study between the flocculation performance of a commercial anionic flocculant （A100PWG： polyacrylamide） and that of the prepared CMCNa showed that the performance of the waste-based flocculant with a DS of 1.17 and a DP of 480 was 10% better than that achieved by the commercial one.

关键词： carboxymethylcellulose flocculants date palm rachis flocculation process

A Challenging Approach to Improve the Low Affinity of Acrylic Fibres to Be Successfully Dyed with a Bio-Colorant Extracted from Grape Marc

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第3期7卷 289-300页

作者： Noureddine Baaka Manel Ben Ticha Wafa Haddar mohamed farouk Mhenni University of Monastir Faculty of Sciences of MonastirResearch Unity of Applied Chemistry and Environment5000 MonastirTunisia National Engineering School of Monastir 5019 MonastirTunisia Higher Institute of Technological Studies 5070Ksar HellalMonastirTunisia

Acrylic fibres are highly crystalline and non-polar polymers,which makes their dyeing a very difficult step that poses real technical *** order to overcome this concern,it is intended in this paper to modify acrylic fibers by different methods namely cationisation using the Crosscolor DRT then amidoximation using hydroxylamine hydrochloride and ammonium *** resulted samples were dyed then with the bio-colorant extracted from grape *** effect of the pretreatment on fibers fine structure using X-ray diffraction and the scanning electron microscope(SEM)images and its correlation with the colour strength of the dyed fabrics was *** dyeing parameters,such as dye bath pH and temperature on the performances of this dyeing process were *** dyeing qualities and new shades varying from brown to grey and dark green have been obtained following process optimization,mordanting and modification of acrylic fibers by the technique of cationisation.

关键词： Modified acrylic fibers grape marc bio-colorant mordant.

Coastal wetland vegetation features and digital Change Detection Mapping based on remotely sensed imagery:El-Burullus Lake, Egypt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2020年第1期8卷 66-79页

作者： Asmaa Nasser mohamed Eid C.O.Olatubara T.A.Ewemoje Haitham farouk mohamed Talaat El-Hennawy Department of Environmental Management The Pan African University for Earth and Life Sciences Including Health and AgricultureUniversity of IbadanIbadanNigeria Department of Computer Science Faculty of Computers and InformationSuez UniversitySuezEgypt Nature Conservation Sector of the Ministry of Environment Egypt

El-Burullus Lake is one of the four Egyptian Ramsar sites that constitute internationally important wetlands as they contain a rich biodiversity and have a large number of water bird *** the valuable resources in El-Burullus Lake and its surrounding area have faced various threats to wetlands over recent *** study was carried out to evaluate the dynamics of land cover change using three change scenes of recent and past satellite data from 1990 to *** study utilized ArcGIS10.7,ERDAS Imagine 14,Landsat TM(1990,1999,and 2010),Landsat OLI-TIRS(2019)to analyze the land-use/land-cover(LULC)of El-Burullus *** Difference Vegetation Index(NDVI)and Normal-ized Difference Water Index(NDWI)were employed to assess the change scenario of the *** indicated that vegetated land has increased significantly with a concomitant shrinkage in the water body and open soil during the study *** 53 km^2(7.0%)of water body and 8.7 km^2(1.3%)of open soil were lost,while vegetation areas expanded to approximately 29.9 km^2(7.4%).Factors that underpin the observed changes in the area are;reclamation projects and fish-farms which are creating the danger of drying up of the southern coastal parts of the lake,as well as spreading of reed beds(mainly:Phragmites australis)that covers about 20%of El-Burullus lake which led to dry up the lake ***,the study suggests the need for urgent attention on conservation of remaining wetland resources for sustainable utilization for the next generation.

关键词： El-burullus natural wetlands LULC NDVI NDWI Remote sensing Vegetation indices

Structural Characterization and Antioxidant Activity of Lignin Extracted from Ficus Carica L.

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 Renewable Materials 2019年第4期7卷 345-354页

作者： Ibtissem Moussa Ramzi Khiari Ali Moussa Gérard Mortha mohamed farouk Mhenni University of Monastir Faculty of SciencesUR13 ES 63-Research Unity of Applied Chemistry&EnvironmentAvenue of the environment5019 MonastirTunisia University of Monastir National Engineering School of MonastirStreet of Ibn El Jazzar5000 MonastirTunisia Higher Institute of Technological Studies of Ksar-Hellal Department of Textile-TunisiaAvenue of Hadj Ali Soua.5070 Ksar-HellalTunisia University of Grenoble Alpes CNRSGrenoble INPLGP2F-38000 GrenobleFrance

The most abundant phenolic biopolymer in the biosphere is the *** phenolic biopolymer commonly exists in combination with polysaccharides and other cell wall *** this study,the solvent system dioxane-water is used to extract lignin,which is considered as unaltered native *** dioxane lignin extracted from fig stems was characterized regarding to its structural feature,quantification of its functional groups,molecular weight,and evaluation of its thermal *** and molecular weight distribution of the studied lignin indicated that isolated lignin contained a low amount of sugar(c.a.19%)and had a high weight-average molecular weight(10068 ***-1).Lignin sample had approximately the same amounts of guaiacyl(G)and p-hydroxyphenyl(H)units with relatively fewer syringyl(S)*** isolated lignin revealed good antioxidant ***,it proved to have a high potential of application in new antioxidants formulations.

关键词： Ficus Carica L. lignin organosolv molecular weight NMR spectroscopy antioxidant activity