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Journal of the Nigerian Association of Mathematical Physics最新文献

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On the effects of wave steepness on higher order Stokes waves 波浪陡度对高阶斯托克斯波的影响
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40230
B. Oyetunde
{"title":"On the effects of wave steepness on higher order Stokes waves","authors":"B. Oyetunde","doi":"10.4314/JONAMP.V11I1.40230","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40230","url":null,"abstract":"The effect of wave steepness on higher order finite amplitude Stokes waves is investigated analytically and numerically. It is shown that the phase speed increases as the wave steepness increases thereby initiating the wave instabilities. As the order increases, the phase speed also increases .However, the impact of wave steepness on phase speed is more pronounced for the wave steepness parameter ε𕟲.09 where 0.02 ≥ ┒ ≥ 0.33\u0000Beyond the upper bound, instability – wave breaking comes in.\u0000 JONAMP Vol. 11 2007: pp. 369-374","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Improving access, reliability and efficiency of a distributed operating system using replicated distributed object abstraction 使用复制的分布式对象抽象提高分布式操作系统的访问、可靠性和效率
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40245
Tj Odule
{"title":"Improving access, reliability and efficiency of a distributed operating system using replicated distributed object abstraction","authors":"Tj Odule","doi":"10.4314/JONAMP.V11I1.40245","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40245","url":null,"abstract":"This paper presents an alternative distributed operating system architecture based on the concept of replication of distributed objects. A complete or partial copy of distributed object's state is placed in each node where the object is used. Replication algorithms ensure copy coherence. For each object the most efficient access algorithm, taking its semantics into account, can be applied. This makes our proposed architecture a convenient platform for developing reliable distributed application. JONAMP Vol. 11 2007: pp. 475-484","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124304454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Testing Mulliken approximation using hydrogen atom 用氢原子检验Mulliken近似
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40250
E. Aiyohuyin, A. Oni-Ojo
{"title":"Testing Mulliken approximation using hydrogen atom","authors":"E. Aiyohuyin, A. Oni-Ojo","doi":"10.4314/JONAMP.V11I1.40250","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40250","url":null,"abstract":"We computed the ground state energy of the hydrogen atom within the semi-empirical method prescribed by Mulliken. The one-particle basis functions used are Slater-type-orbitals (STO). The exponential parameters terminated at 25. The more the basis set used in the calculation, the better the result, in agreement with standard electronic-structure calculations. The density matrix for the free electron gas at zero temperature was adopted (Xiaoding Zhang and D. A. Drabold. Phys. Rev. B63, 233109 (2001 [10]). JONAMP Vol. 11 2007: pp. 505-508","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121859822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic Analysis of a non-linear vibrating circular cylindrical shell using the regular perturbation technique 非线性振动圆柱壳的正则摄动动力学分析
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40224
M. Jiya, Y. Aiyesimi
{"title":"Dynamic Analysis of a non-linear vibrating circular cylindrical shell using the regular perturbation technique","authors":"M. Jiya, Y. Aiyesimi","doi":"10.4314/JONAMP.V11I1.40224","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40224","url":null,"abstract":"We investigated in this paper the effect of non-linear vibration of a circular cylindrical shell subject to axially symmetric loading. We consider the approximation of the equation using the regular perturbation technique and thereby solving the resulting linear equation analytically. The result indicates an exponential decay away from the edge of the shell, which is one of the unique characteristics of a shell. From the numerically simulated results it was observed that increase in the excitation amplitude produces a wrinkling effect on the shell. JONAMP Vol. 11 2007: pp. 301-310","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127174088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stiffly stable continuous extension of second derivative linear multi-step methods with an off-step point for initial value problems in ordinary differential equations. 常微分方程初值问题二阶导数线性多步法的离步点刚性稳定连续扩展。
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40211
M. Ikhile, R. Okuonghae
{"title":"Stiffly stable continuous extension of second derivative linear multi-step methods with an off-step point for initial value problems in ordinary differential equations.","authors":"M. Ikhile, R. Okuonghae","doi":"10.4314/JONAMP.V11I1.40211","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40211","url":null,"abstract":"In this paper, we introduce a continuous extension of second derivative linear multi-step methods with a hybrid point for the numerical solution of initial valued stiff ordinary differential equations. The continuous extension is based on the Gear's fixed step size backward differential methods [7]. The intervals of absolute stability of methods of step number k𕟯 are determined using the root locus plot. Numerical results of the methods solving a non-linearly stiff initial value problem in ordinary differential equations are compared with that from the state-of-the-art ordinary differential equations code of MATLAB discussed in Higham et al [9]. JONAMP Vol. 11 2007: pp. 175-190","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132160493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Measurement of air aerosol size during the 2001/2002 harmattan season at Uturu, Nigeria. 在尼日利亚Uturu测量2001/2002年哈马坦季节的空气气溶胶大小。
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40268
I. Chiemeka, M. Oleka, T. Chineke
{"title":"Measurement of air aerosol size during the 2001/2002 harmattan season at Uturu, Nigeria.","authors":"I. Chiemeka, M. Oleka, T. Chineke","doi":"10.4314/JONAMP.V11I1.40268","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40268","url":null,"abstract":"The measurement of air aerosol size during the 2001/2002 harmattan season at Uturu, Nigeria is of interest. Aerosol size distributions were measured making use of a zeiss micrometer which is inserted on the diaphragm inside the eyepiece of Olympus binocular microscope. Dust samples collected by direct deposition within the months of October 2001 to February 2002 on a Whatman filter paper made of cellulose were placed on a glass slide and viewed under a microscope. The mean value of the measured aerosol diameter and the standard deviation is 2.74 ± 1.7μm. The mean of the calculated surface area distribution of the aerosols is 38.33 ± 9.3 square μm. JONAMP Vol. 11 2007: pp. 635-640","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130410901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetic and velocity fields MHD flow of a stretched vertical permeable surface with buoyancy in the presence of heat generation and a first order chemical reaction 在产生热量和一级化学反应的情况下，具有浮力的拉伸垂直可渗透表面的磁场和速度场
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40205
A. M. Okedoye, O. Lamidi, R. Ayeni
{"title":"Magnetic and velocity fields MHD flow of a stretched vertical permeable surface with buoyancy in the presence of heat generation and a first order chemical reaction","authors":"A. M. Okedoye, O. Lamidi, R. Ayeni","doi":"10.4314/JONAMP.V11I1.40205","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40205","url":null,"abstract":"Analytical solutions for heat and mass transfer by laminar flow of Newtonian, viscous, electrically conducting and heat generation/absorbing fluid on a continuously moving vertical permeable surface with buoyancy in the presence of a magnetic field and a first order chemical reaction are reported. The solutions for magnetic and velocity fields are obtained for various thermal grashof number, mass grashof number, Hartmann number, and magnetic buoyancy. The effect of various parameters on skin friction coefficient Cf were also examined and reported. Graphical illustration features prominently in this work. JONAMP Vol. 11 2007: pp. 129-136","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"27 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120975965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fabrication and optical characterization of improved electroless chemically deposited strontium fluoride (SrF2) thin films at 320K 320K下改进化学化学沉积氟化锶(SrF2)薄膜的制备和光学特性
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40237
P. Ilenikhena
{"title":"Fabrication and optical characterization of improved electroless chemically deposited strontium fluoride (SrF2) thin films at 320K","authors":"P. Ilenikhena","doi":"10.4314/JONAMP.V11I1.40237","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40237","url":null,"abstract":"Thin semi conductor films of strontium fluoride (SrF2) were successfully deposited on glass microscope slides using simple and cheap electroless chemical bath deposition methods at 320K and pH values of 9, 10 and 12. Controlled addition of ethylenediamine tetra acetate (EDTA), another complexing agent with pH to oppose that of bath constitutions, was used to vary the deposition pH values. X-ray diffractometry technique was used to confirm the depositions. Absorbance spectra data of the films were obtained by a single bean spectrophotometer (Pharmacia LKB Biochrom 4060) at wavelength range 200 to 900nm. Other optical and solid state properties were calculated from the data and compared with other deposited thin films. Average optical and solid state properties include absorbance ranging from 0.034 to 0.086, transmittance 0.820 to 0.925, reflectance 0.041 to 0.094, refractive index 1.51 to 1.88 absorption coefficient 0.078 to 0.198x 106m) -1 , electrical conductivity 0.40 to 0.49 (ohm cm) -1 , film thickness 0.013 to 0.074μm and bandgap 2.55 to 2.75 eV. The deposited thin films could find applications in antireflection coatings for eyeglass, solar thermal control devices and solar cells JONAMP Vol. 11 2007: pp. 415-422","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128913987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contributions of influence function using the inverse autocorrelation function in the detection of outliers 利用逆自相关函数检测离群值的影响函数的贡献
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40267
N. Olewuezi
{"title":"Contributions of influence function using the inverse autocorrelation function in the detection of outliers","authors":"N. Olewuezi","doi":"10.4314/JONAMP.V11I1.40267","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40267","url":null,"abstract":"Outliers in time series, depending on their nature may have a moderate to significant impact on the effectiveness of the standard methodology for time series analysis with respect to model identification, estimation and forecasting. The suggested procedure used for identifying the outliers graphically in time series data was investigated by considering the influence function for the inverse autocorrelation function (IACF). Form the findings, it was noticed that for large series the influence was almost positive in values while for relatively short series the large negative influence are noticeable. The model order determination technique was also proposed. JONAMP Vol. 11 2007: pp. 627-634","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129480502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Certain inequalities and convolution properties for multivalent and meromorphically multivalent functions 多价函数和亚纯多价函数的若干不等式和卷积性质
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40253
A. Oladipo, M. Ogundiran
{"title":"Certain inequalities and convolution properties for multivalent and meromorphically multivalent functions","authors":"A. Oladipo, M. Ogundiran","doi":"10.4314/JONAMP.V11I1.40253","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40253","url":null,"abstract":"By means of certain extended derivative operator of Salagean type, the author introduces and investigates three new subclasses of p-valently analytic functions. The reason for this is to use generalized Salagean derivative operator to bring together many earlier inroduced subclasses of p-valently functions to become special cases of the newly defined subclasses, see [2,8].The various results obtain for these functions include coefficient inequalities, coefficient bounds and convolution properties. These results coincides with many existing results using different choices of n and β JONAMP Vol. 11 2007: pp. 519-524","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130894584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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