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Acta Mathematica Scientia 2018年第6期38卷 1805-1820页

作者： Ogonnaya Michael ROMANUS Ukamaka Victoria NNYABA Monday Ogudu NNAKWE department of pure and applied Mathematics African University of Science and Technology

In this paper, relaxed iterative algorithms of Krasnoselskii-type and Halpern-type that approximate a solution of a system of a generalized mixed equilibrium problem anda common fixed point of a countable family of totally quasi-C-asymptotically nonexpansivemulti-valued maps are constructed. Strong convergence of the sequence generated by thesealgorithms is proved in uniformly smooth and strictly convex real Banach spaces with Kadec-Klee property. Furthermore, several applications of our theorems are also presented. Finally,our theorems are significant improvements on several important recent results for this classof nonlinear problems.

关键词： Halpern-type algorithm Krasnoselskii-type algorithm system of generalizedmixed equilibrium problems totally quasi-C-asymptotically nonexpansive multi-valued maps equally continuous maps

On the Same n-Types for the Wedges of the Eilenberg-Maclane Spaces

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Chinese Annals of Mathematics,Series B 2016年第6期37卷 951-962页

作者： Dae-Woong LEE department of Mathematics Institute of Pure and Applied Mathematics Chonbuk National University

Given a connected CW-space X, SNT（X） denotes the set of all homotopy types [X＇] such that the Postnikov approximations X（n） and X＇^（n） are homotopy equivalent for all n. The main purpose of this paper is to show that the set of all the same homotopy n- types of the suspension of the wedges of the Eilenberg-MacLane spaces is the one element set consisting of a single homotopy type of itself, i.e., SNT（Σ（K（Z, 2a1） ∨ K（Z, 2a2）∨… ∨ K（Z,2ak））） = ＊ for a1 〈 a2 〈 … 〈 ak, as a far more general conjecture than the original one of the same n-type posed by McGibbon and Moller （in [McGibbon, C. A. and Moller, J. M., On infinite dimensional spaces that are rationally equivalent to a bouquet of spheres, Proceedings of the 1990 Barcelona Conference on Algebraic Topology, Lecture Notes in Math., 1509, 1992, 285-293].）

关键词： Same n-type Aut Basic Whitehead product Samelson product Bott-Samelson theorem Tensor algebra Cartan-Serre theorem Hopf-Thom theorem

Atomic decomposition of Besov-type and Triebel-Lizorkin-type spaces

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Science China Mathematics 2013年第5期56卷 1073-1086页

作者： DRIHEM Douadi department of Mathematics Laboratory of Mathematics Pure and AppliedM'sila University

With the help of the maximal function caracterizations of the Besov-type space Bs,τ p,q and the Triebel- Lizorkin-type space Fs,τ p,q, we present the atomic decomposition of these function spaces. Our results cover ... 详细信息

关键词： Bs,τ p,q spaces Fs,τ p,q spaces Besov spaces Triebel-Lizorkin spades atoms

Dermestes maculatus Degeer infestation impact on market loss of dried fish in Kwara State,Nigeria

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Aquaculture and Fisheries 2018年第4期3卷 170-173页

作者： Adeyemi Mufutau Ajao Segun Olayinka Oladipo Barakat O.Soliu zoology Unit Department of Bioscience and BiotechnologyCollege of Pure and Applied SciencesKwara State UniversityMalete1530Nigeria

Dried fish vendors located at three markets in Kwara State,Nigeria were surveyed and Dermestes maculatus Degeer-infested specimens of dried Chrysichthys nigrodigitatus,Heterobranchus bidorsalis and Oreochromis niloticus were analyzed in the *** dried fish species were exposed to *** larvae and adults for 35 days at ambient laboratory conditions that coincided with their developmental cycle after which the level of damages were *** vendor survey showed that the Ipata market had the most dried fish vendors within the age of 20-30 years(46.66%)and that 60%of the fish vendors had,atmost,20 years of *** weight loss in dried fish due to *** infestations(larval,adult)was ***(22.66±1.20g,29.00±3.05g),***(14.33±2.96g,20.00±0.58g),and ***(14.00±1.53g,15.00±1.15g)in decreasing *** suggests that the development of cost-effective methods for pest control in dried fish would greatly reduce market loss of product for dried fish vendors from *** and other pestiferous species,making the dried fish business more profitable in Nigeria.

关键词： Dried fish Dermestes maculatus Infestation Fish vendors

Effects of polyurethane hardness on the propagation of acoustic signals from partial discharge

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High Voltage 2024年第5期9卷 1125-1135页

作者： Abdul Samad W.H.Siew Martin Given John Liggat Igor Timoshkin department of Electronic and Electrical Engineering University of StrathclydeGlasgowUK department of pure and applied Chemistry University of StrathclydeGlasgowUK

Polymeric insulation is a critical component of high voltage ***,exposure to high electric stress can cause partial discharges(PDs)to occur and may result in the deterioration of insulation and lead to dielectric *** PD events are accompanied by the production of acoustic pressure impulses in the *** of these acoustic pressure impulses can reveal the presence of PDs and locate their ***,analysing the detected acoustic emission(AE)signal is *** acoustic pressure source's nature and the propagating medium's properties,such as density,viscosity,and elasticity,significantly affect the propagating AE *** effects of the hardness of the polyurethane(PU)on the propagating AE signal are reported by the authors based on results obtained from laboratory *** was observed that the decay rate in the magnitude of the acoustic impulse was high in PU at all hardness levels following an exponential *** analysis of the frequency spectra indicates that the higher frequency components attenuate more strongly with *** laboratory results can be valuable for engineers and industries as they provide valuable insight into how the physical characteristics of a material affect the propagation characteristics of AE signals during the detection and location of PD source using the AE detection technique.

关键词： polyurethane insulation propagation

Systematic study of Ce^(3+) on the structural and magnetic properties of Cu nanosized ferrites for potential applications

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Journal of Rare Earths 2018年第2期36卷 156-164页

作者： Majid Niaz Akhtar A.B.Sulong M.N.Akhtar Muhammad Azhar Khan department of Physics Muhammad Nawaz Sharif University of Engineering and Technology (MNSUET) department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia (UKM) Institute of pure and applied Biology Department of ZoologyBahaudin Zakariya University department of Physics The Islamia University of Bahawalpur

Ce^（3＋） substituted Cu-spinel nanoferrites CuCe_xFe_（2-x）O_4（x=0.00, 0.02, 0.04, 0.06, 0.08 and 0.10） were synthesized via sol-gel self-combustion hybrid route. Single phase spinel ferrite of Cu nanoferrites were examined using X-ray diffraction（XRD） analysis whereas the multiphase structure was observed as Ce contents increased from x=0.06. Field emission scanning electron microscopy（FESEM）, Thermogravimetric and differential thermal analysis（TGA and DTA） and Fourier transform infrared spectroscopy（FTIR） were used to find out the morphology phase and metal stretching vibrations of Ce^（3＋） substituted nanocrystalline ferrites. The crystallite size was increased and found in the range of 25-91 nm. The agglomerations in Cu ferrite samples increase as the Ce^（3＋） concentration increases. The magnetic properties such as remanence, saturation magnetization, coercivity, Bohr magneton and magnetocrystalline anisotropy constant（K） were determined using M-H loops recorded from a vibrating sample magnetometer（VSM）. Saturation magnetization, remanence and coercivity are increased as the Ce^（3＋）contents increase in Cu nanocrystalline samples. Moreover, law of approach to saturation（LoA） was used to calculate the maximum value of saturation for Ce-doped Cu nanoferrites. The soft magnetic behaviour of the Cu nanoferrite is observed as compared to the samples substituted with the increased Ce contents in Cu nanocrystalline ferrite. Bohr magneton and magnetocrystalline anisotropy are found to increase with the substitution of rare earth Ce^（3＋） contents in Cu spinel nanocrystalline ferrite. Cedoped Cu nanocrystalline ferrites with excellent properties may be suitable for potential applications in sensing, security, switching, core, multilayer chip inductor, biomedical and microwave absorption applications.

关键词： Ce-doped Cu nanocrystalline ferrites X-ray diffraction(XRD) Scanning electron microscopy(SEM) Transmission electron microscopy(TEM) Fourier transform infrared(FTIR) Vibrating sample magnetometer(VSM)

Comparative assessment of intestinal helminths prevalence in Water,Sanitation and Hygiene(WASH) intervention and non-intervention communities in Abeokuta,Nigeria

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Asian Pacific Journal of Tropical Biomedicine 2017年第6期7卷 524-532页

作者： Oluwaseyi Tunrayo Taiwo Sammy Olufemi Sam-Wobo Olufunmilayo Ajoke Idowu Adewale Oladele Talabi Adewale Matthew Taiwo department of pure & applied zoology Federal University of AgricultureAbeokutaNigeria department of Veterinary Medicine & Surgery Federal University of AgricultureAbeokutaNigeria department of Environmental Management & Toxicology Federal University of AgricultureAbeokutaNigeria

Objective:This study compared the prevalence of intestinal helminths in Water,Sanitation and Hygiene(WASH) intervention and non-intervention communities in Abeokuta,***:Stool samples were collected from 225 respondents in a study carried out between July and November,*** samples were examined for presence of helminths using Formol-Ether concentration *** collected from stool samples were analyzed using SPSS for Windows(version 16).Results:Results showed that,at the intervention community,88 out of 113 respondents were infected with at least one helminth infection while at non-intervention community,80 out of 112 respondents were *** result revealed overall helminth prevalence of78% at Mawuko and 71% at *** both intervention(Mawuko) and non-intervention(Isolu) communities,hookworm was the most prevalent helminth observed(21% and18%,respectively) followed by Ascaris lumbricoides(13% and 13%,respectively),Taenia sp.(4% and 3%,respectively) and Trichostrongylus sp.(1% and 3%,respectively).Cases of single infections of Trichuris trichiura,Strongyloides stercoralis and Hymenolepsis nana were observed only at the non-intervention ***,*** occurred in the multiple infections observed at the intervention *** more(p < 0.05) cases of infections were observed in male(46%) at the intervention community than female(31%) while in non-intervention community females(39%) were significantly(p < 0.05) more infected than their male counterparts(32%).Conclusions:This study concludes that the Community Led-Total Sanitation intervention programme,which was executed in Mawuko was not effective as expected.

关键词： Intestinal helminths WASH intervention Sanitation Infections Prevalence

MHD flow and heat transfer of micropolar fluid between two porous disks

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applied Mathematics and Mechanics(English Edition) 2012年第1期33卷 51-64页

作者： M. ASHRAF A. R. WEHGAL Centre for Advanced Studies in pure and applied Mathematics Bahauddin Zakariya University department of Mathematics Stockholm University

A numerical study is carried out for the axisymmetric steady laminar incompressible flow of an electrically conducting micropolar fluid between two infinite parallel porous disks with the constant uniform injection through the surface of the disks. The fluid is subjected to an external transverse magnetic field. The governing nonlinear equations of motion are transformed into a dimensionless form through yon Karman＇s similarity transformation. An algorithm based on a finite difference scheme is used to solve the reduced coupled ordinary differential equations under associated boundary conditions. The effects of the Reynolds number, the magnetic parameter, the micropolar parameter, and the Prandtl number on the flow velocity and temperature distributions are discussed. The results agree well with those of the previously published work for special cases. The investigation predicts that the heat transfer rate at the surfaces of the disks increases with the increases in the Reynolds number, the magnetic parameter, and the Prandtl number. The shear stresses decrease with the increase in the injection while increase with the increase in the applied magnetic field. The shear stress factor is lower for micropolar fluids than for Newtonian fluids, which may be beneficial in the flow and thermal control in the polymeric processing.

关键词： MHD flow porous disk micropolar fluid heat transfer microrotation

Comultiplications on a wedge of two spheres

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Science China Mathematics 2011年第1期54卷 9-22页

作者： ARKOWITZ Martin LEE Dae-Woong department of Mathematics Dartmouth College department of Mathematics and Institute of pure and applied Mathematics Chonbuk National University

In this paper we study the set of comultiplications on a wedge of two spheres. We are primarily interested in the size of this set and properties of the comultiplications such as associativity and commutativity. Our methods involve Whitehead products in wedges of spheres and the Hopf-Hilton invariants. We apply our results to specific examples and determine the number of comultiplications, associative comultiplications and commutative comultiplications in these cases.

关键词： co-H-spaces comultiplications homotopy associativity homotopy commutativity basic Whitehead products Hilton’s formula Hopf-Hilton invariants

CO2 capture by aqueous ammonia process in the clean development mechanism for Nigerian oil industry

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Frontiers of Chemical Science and Engineering 2013年第3期7卷 366-380页

作者： A. A. Olajire Industrial and Environmental Chemistry Unit Department of Pure and Applied Chemistry Ladoke Akintola University of Technology Ogbomoso Nigeria

The clean development mechanism （CDM） of the Kyoto Protocol offers developing countries the opportunity to participate in the effort to reduce global greenhouse gas levels and also benefit from sustainable development opportunities. To date, the majority of CDM investments have gone to emerging markets such as China, India, Brazil, and Mexico, while developing countries such as Nigeria have largely been absent from the program. Chemical sequestration using aqueous ammonia process （AAP） offers a clean low carbon technology for the efficient conversion of captured C02 into clean C02 which could be injected into oil field for enhanced oil recovery or as fertilizer source. CDM-CCS （carbon capture and storage） project with AAP has the potential as intervention for leveraging sustainable livelihood development （organic fertilizer for food production） as well as for tackling local （land air and water） and global pollution （reduce methane, SOx and NOx emissions）.

关键词： CO2 capture CDM AAP EOR fertilizer