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Exploring thermocline and water masses variability in southern South China Sea from the World Ocean Database(WOD)

Acta Oceanologica Sinica 2019年第1期38卷 38-47页

作者： afifi johari Mohd Fadzil Akhir Institute of Oceanography and Environmental Studies University Malaysia of Terengganu

Study about water characteristics(temperature and salinity) from the World Ocean Database(WOD) was conducted in the area of southern South China Sea(SSCS), covering the area of 0°–10°N, 100°–117°E. From interannual analysis, upper layer(10 m) and deep water temperature(50 m) increased from 1951 until 2014. Monthly averaged show that May recorded the highest upper layer temperature while January recorded the lowest. It was different for the deep water which recorded the highest value in September and lowest in February. Contour plot for upper layer temperature in the study area shows presence of thermal front of cold water at southern part of Vietnam tip especially during peak northeast season(December–January). The appearances of warm water were obviously seen during generating southwest monsoon(May–June). Thermocline study revealed the deepest isothermal layer depth(ILD) during peak northeast and southwest monsoon. Temperature threshold at shallow area reach more than 0.8°C during the transitional period. Water mass study described T-S profile based on particular region. Water mass during the southwest monsoon is typically well mixed compared to other seasons while strong separation according to location is very clear. During transitional period between northeast monsoon to southwest monsoon, the increasing of water temperature can be seen at Continental Shelf Water(CSW) which tend to be higher than 29°C and vice versa condition during transitional period between southwest monsoon to northeast monsoon. Dispersion of T-S profile can be seen during southwest monsoon inside Tropical Surface Water(TSW) where the salinity and temperature become higher than during northeast monsoon.

关键词： southern South China Sea upper layer temperature northeast monsoon southwest monsoon thermocline water mass

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Infestation and morphological identification of the stalked epizoic barnacle Octolasmis on the blue crab Portunus pelagicus from the Red Sea

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Journal of Oceanology and Limnology 2018年第4期36卷 1374-1382页

作者： Rafat afifi KHATTAB Taibah University Faculty of Sciences Department of Biology Suez Canal University Faculty of Science Department of Marine Science

The intensity of infestation of the epizoic stalked barnacle Octolasmis on the blue crab was calculated for a total of 180 individuals collected around Jeddah, the western Red Sea Saudi coast. More than 90% of the crabs were found bearing the Octolasmis at a prevalence rate of 92% and mean intensity of 18.5 ? 18.6(0–127 epibiont per host). The intensity of infestation increased with host size in the range 90–135 mm. Generally, females were more infested(69%) than the males(31%). Octolasmis angulata occurred mostly on the gills, and the lower side of the gill chambers was more infested(84%) than the upper side(16%) and the left side of gills was also more infested than the right side in both males and females. Further studies are still needed to examine the commensal relationship and its impact on the fishery market of the Red Sea blue crab populations.

关键词： Octolasmis ecology commensal infestation Portunuspelagicus Red Sea

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MPB:A modified Poisson blending technique

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Computational Visual Media 2015年第4期1卷 331-341页

作者： Mahmoud afifi Khaled F.Hussain Department of Information Technology Assiut University Department of Computer Science Assiut University

Image cloning has many useful applications,such as removing unwanted objects,fixing damaged parts of images,and panorama stitching. Instead of using pixel intensities,the gradient domain is used in Poisson image editing; however,it suffers from two main problems: color bleeding and bleeding *** this paper,a modified Poisson blending(MPB)technique is presented which ensures dependency on the boundary pixels of both target and source images rather than just those of the target. The problem of bleeding artifacts is reduced. This makes the proposed technique suitable for use in video compositing as it avoids the flickering caused by bleeding *** reduce the problem of color bleeding,we use an additional alpha compositing step. Our experimental results using the proposed technique show that MPB reduces the bleeding problems and generates more natural composited images than other techniques.

关键词： image processing image inpainting image blending image cloning image enhancement

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Ameliorative effect of zinc oxide and silver nanoparticles on antioxidant system in the brain of diabetic rats

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Asian Pacific Journal of Tropical Biomedicine 2015年第10期5卷 874-877页

作者： Mohamed afifi Aaser Mohamed Abdelazim Department of Biological Sciences Faculty of ScienceUniversity of Jeddah Department of Biochemistry Faculty of Veterinary MedicineZagazig University

Objective: To test the ability of both zinc oxide nanoparticles(Zn ONPs) and silver nanoparticles(SNPs) to ameliorate the oxidative stress resulted from diabetes in diabetic ***: Fifty male albino rats were used; ten of them were served as control group and forty, as the experiment group, were injected with streptozotocin at the single intraperitoneal dose of 100 mg/kg. Then, the experiment group was subdivided into, diabetic,diabetic + Zn ONPs, diabetic + SNPs and diabetic + insulin groups. The activities and m RNA expression levels of superoxide dismutase, catalase, glutathione peroxidase and glutathione reductase were determined in brain tissues. Malondialdehyde, total antioxidant capacity, zinc and silver concentrations were estimated in the brain tissues of all ***: A significant increase in the activities and m RNA expression levels of superoxide dismutase, catalase, glutathione peroxidase and glutathione reductase was *** levels were significantly decreased while there was a significant increase in the zinc, silver concentrations and total antioxidant capacity in brain of Zn ONPs and SNPs treated rats, compared with diabetic or diabetic + insulin group and their control ***: Zn ONPs and SNPs can be used to ameliorate the oxidative stress in brain resulted from diabetes mellitus.

关键词： glutathione antioxidant superoxide silver peroxida

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A Coordinated Search Algorithm for a Lost Target on the Plane

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Computer Systems Science & Engineering 2022年第1期40卷 127-137页

作者： Sundus Naji Al-Aziz Abd Al-Aziz Hosni El-Bagoury W.afifi Department of Mathematics College of SciencePrincess Nourah bint Abdulrahman UniversityRiyadhSaudi Arabia Department of Mathematics Faculty of ScienceTanta UniversityTantaEgypt Department of Mathematics and Statistics College of ScienceTaibah UniversityYanbuSaudi Arabia

Concepts in search theory have developed since World War *** study of search plans has found considerable interest among searchers due to its wide applications in our *** for lost targets either located or moved is often a time-critical issue,especially when the target is very *** many commercial and scientific missions at sea,it is of crucial importance to find lost targets *** illustrate a technique known as coordinated search,that completely characterizes the search for a randomly located target on a *** idea is to avoid wasting time looking for a missing *** searchers or robots start from the center of a circle to search out a lost target,the first searcher looks for the target on the right side of the circular area,and the second one looks for it on the left *** time taken to detect the target is obtained by assuming the target’s position has a symmetric *** procedures to facilitate the detection of the target are presented as an algorithm and as a *** application demonstrates the applicability of this search technique and the associated decrease in search *** effectiveness is illustrated by numerical results,which indicates considerable promise.

关键词： Expected value sensors lost target coordinated search search algorithm lost ship

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Y^(3+) substituting-adjusted mechanical,dielectric,and impedance properties of cobalt copper zinc nanoferrites for high frequency applications

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Journal of Rare Earths 2023年第10期41卷 1597-1605,I0005页

作者： S.F.Mansour N.S.Al-Bassami M.afifi M.A.Abdo Physics Department Faculty of ScienceZagazig UniversityZagazigEgypt General Studies Department Jubail Industrial CollegeJubail Industrial CitySaudi Arabia Faculty of Nanotechnology for Postgraduate Studies Cairo UniversityEl-Sheikh Zayed12588Egypt

Upgrading mechanical-dielectric features of ferrites through rare-earth yttrium(Y^(3+))doping provides feasibility to evolving high-frequency electronic *** paper reports the mechanical and dielectric properties of Co_(0.5)Cu_(0.25)Zn_(0.25)Y_(x)Fe_(2-x)O_(4)ferrite nanoparticles labeled as CCZYF#0,CCZYF#1,CCZYF#2,CCZYF#3,CCZYF#4 and CCZYF#5 for x=0.***.0.02,0.04,0.06,0.08,and 0.1,*** frequency and temperature dependence of dielectric parameters and co nductivity of all CCZYF nanoferrites are well *** nanoferrite CCZYF#5 has the highest dielectric constant(enhancing ratio 170%)and the highest conductivity(enhancing ratio 7125.81%)compared with the undoped *** plots of all CCZYF nano ferrites manifest two arcs;the main reasons for the dielectric process are the grain boundaries and bulk *** impedance parameters were determined,which showed the effective role of Y^(3+)ions on their *** nanoferrite CCZYF#5 has the highest grain boundaries capacitance(with enhancing ratio of 59.40%)and the highest grains capacitance(with enhancing ratio of 22.53%)with a relaxation time decrement efficiency of 62.51%.An ultrasonic flaw detector was utilized to determine the elastic moduli of all CCZYF *** nanoferrite CCZYF#5 has the highest longitudinal modulus(with enhancing ratio of 20.95%),the highest shear modulus(with enhancing ratio of48.72%),highest Young's modulus(with enhancing ratio of 88.47%),the highest bulk modulus(with enhancing ratio 13.27%)and the highest micro hardness(with enhancing ratio 77.77%).Hence,Y3+tuned Co-Cu-Zn nanoferrites possess new opportunities for high-frequency and storage applications.

关键词： Nanoferrites Rare arth ions Mechanical properties Dielectric parameters Impedance spectroscopy

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COVARIANCE STRUCTURAL ANALYSIS WITH POLYTOMOUS VARIABLES IN SEVERAL POPULATIONS

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Acta Mathematicae Applicatae Sinica 1993年第1期9卷 63-70页

作者：潘伟贤李锡钦 P.M.BENTLER A.A.afifi The Chinese University of Hong Kong Hong Kong University of California Los AngelesUSA

In this paper, covariance structures with polytomous variables in several populations are analyzed. A computationally efficient multistage procedure is proposed to estimate the thresholds and the covariance structure *** properties of the estimators are derived, and a computer program is implemented to obtain the solution. An artificial example is presented to illustrate the method.

关键词： LISREL COVARIANCE STRUCTURAL ANALYSIS WITH POLYTOMOUS VARIABLES IN SEVERAL POPULATIONS

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A pilot study using lactulose in management of minimal hepatic encephalopathy in children with extrahepatic portal vein obstruction

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World Journal of Pediatrics 2017年第1期13卷 70-75页

作者： Hanaa Mostafa El-Karaksy Omneya afifi Azza Bakry Ann Abdel Kader Noha Saber Department of Pediatrics Kasr Alainy School of MedicineCairo UniversityEgypt Department of Psychiatry Kasr Alainy School of MedicineCairo UniversityEgypt Department of Neurophysiology Kasr Alainy School of MedicineCairo UniversityEgypt

Background:Minimal hepatic encephalopathy(MHE)is not associated with overt neuropsychiatric symptoms but rather with subtle changes in psychometric and/or neurOphysiolOgic *** aimed to diagnose MHE in children with extrahepatic portal vein obstruction fEHPV01 and to evaluate the el№ct of lactulose on ***:A prospective study was carried out on 30 patients with EHPVO(21 males;mean age 10+2.5 years).The study was carried out in the Pediatric Hepatology *** University Pediatric Hospital,Cairo,Egypt,between 2011 and *** patients were subjected to clinical and Iaboratory *** testin2 using the arabic version of Wechsler intelligence *** testing by visual electroencephalogram and P300 event related potentials(ERP).

关键词： children extrahepatic portal vein obstruction lactulose minimal hepatic encephalopathy neuropsychometric tests P300 event-related potential

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Raspberry ketone attenuates high-fat diet-induced obesity by improving metabolic homeostasis in rats

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Asian Pacific Journal of Tropical Biomedicine 2020年第1期10卷 18-22页

作者： Ali Alkaladi Haytham Ali Aaser MAbdelazim Mohamed afifi Mohammed Baeshen Ammar AL-Farga University of Jeddah College of ScienceDepartment of BiologyJeddahSaudi Arabia University of Jeddah College of ScienceDepartment of BiochemistryJeddahSaudi Arabia Department of Biochemistry Faculty of Vet.MedicineZagazig UniversityZagazigEgypt Department of Basic Medical Sciences College of Applied Medical SciencesUniversity of BishaBishaSaudi Arabia

Objective:To investigate the molecular mechanisms of the antiobese effect of raspberry ketone against high-fat diet fed ***:Fifty adult male rats were randomly assigned to receive a standard diet,a high fat diet,and the high-fat diet and 0.5%,1%or 2%raspberry *** weight,biochemical parameters and gene expression of CCAAT enhancer-binding protein(C/EBP)-δ,fatty acid synthase(FAS),acetyl Co A carboxylase(ACC),peroxisome proliferator-activated receptor alpha(PPAR-α),hormone-sensitive lipase(HSL)and hepatic carnitine palmitoyltransferase 1A(CPT1A)were ***:Body weight,blood glucose,insulin,total lipids,triacylglycerols,total cholesterol and low-density lipoprotein cholesterol were increased in high-fat diet fed *** high fat diet-induced changes were attenuated by treatment with raspberry ***-density lipoprotein cholesterol was decreased in highfat diet fed rats but increased in rats treated with raspberry *** investigations showed induction of gene expression of C/EBP-δ,FAS,ACC,CPT1A and inhibition of gene expression of PPAR-αand HSL in high-fat diet fed rats as compared with *** ketone treament reversed these changes except ***:Raspberry ketone can prevent obesity induced by a high-fat diet in rats by induction of the expression of enzymes,controlling lipolysis and fatty acidsβoxidation as well as inhibition of gene expressions of adipogenic factors.

关键词： Raspberry ketone Obesity Molecular mechanism

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Vertically aligned one-dimensional ZnO/V2O5 core-shell hetero-nanostructure for photoelectrochemical water splitting

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Journal of Energy Chemistry 2020年第10期29卷 262-274页

作者： Tian-Feng Hou Muhammad Ali Johar Ramireddy Boppella Mostafa afifi Hassan Swati J.Patil Sang-Wan Ryu Dong-Weon Lee MEMS and Nanotechnology Laboratory School of Mechanical EngineeringChonnam National UniversityGwangju 61186Republic of Korea Center for Next-generation Sensor Research and Development Chonnam National UniversityGwangju 61186Republic of Korea Department of Physics Chonnam National UniversityGwangju 61186Republic of Korea Nanomaterials Laboratory Inorganic and Physical Chemistry DivisionCSIR-Indian Institute of Chemical TechnologyHyderabad 500007TelanganaIndia

The vertically aligned one-dimensional(1 D)core-shell structure can maximize the exposure and use of the functionally active surface while maintaining the geometric effects caused by the underlying ***,we have fabricated 1 D vertically aligned ZnO/V2O5 core-shell hetero-nanostructure nanorod arrays(NRs)for photoelectrochemical(PEC)water ***/V2O5 NRs were prepared through the hydrothermal growing of ZnO NRs and then radio frequency(RF)magnetron sputtering deposition of V2O5 for 300,600 and 900 *** photocurrent density of ZnO/V2O5-based photoanodes was gradually increased with the sputtering time,reaching the maximum value of 1.21 m A/cm^2 at 1.23 V *** hydrogen electrode(RHE)for ZnO/V2O5-600,whereas for pure ZnO-based photoanode was 0.42 mA/cm^*** incident photon to electron conversion efficiency(IPCE)of ZnO/V2O5-600 evaluated to be 82.3%which was 2.3 times higher than that of ZnO(36.4%).The improved PEC performance of ZnO/V2O5-600 is because the core-shell structure with a moderate thickness of the V2O5 layer has the extremely high carrier density,largest electrochemically active surface area(ECSA),largest carrier density,lowest charge recombination rate,and the longest lifetime of e-h pairs due to the formation of the staggered gap *** study provides an effective way to design and fabrication of hetero-nanostructures for highefficiency photoelectrodes.

关键词： ZnO/V2O5 core-shell hetero-nanostructure Staggered heterojunction PEC water splitting

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