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Journal of the Nigerian Association of Mathematical Physics最新文献

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Geophysical investigation of Oke-Agbe-Oyin Road failure using VLF and double dipole 利用VLF和双偶极子对奥克-阿格比-奥因公路破裂的物探研究
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40236
K. Ozegin, S. Azi, D. Isiwele
{"title":"Geophysical investigation of Oke-Agbe-Oyin Road failure using VLF and double dipole","authors":"K. Ozegin, S. Azi, D. Isiwele","doi":"10.4314/JONAMP.V11I1.40236","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40236","url":null,"abstract":"The result of this paper is to establish a consistent approach to geophysical handling of road failure using electrical Resistivity method-Double Dipole and Electromagnetic method- VLF (Very Low Frequency). The work was done along Oke-Agbe Road in Ondo State. Computer iterated data from the study area enabled the delineation of the investigated portion of the road into highly weathered and non weathered zones with Resistivity values ranging from 37 – 595 Ωm. The form of road failure identified in this study is due to subsidence arising from differential settlements associated with clayey, fairly thick, geotechnical weak and low resistivity near surface horizon. The results obtained clearly demonstrates the relevance this kind of study in highway feasibility studies and roadway evaluation. JONAMP Vol. 11 2007: pp. 411-414","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"186 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":"123058735","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
Further results on the classes of convex functions 关于凸函数类的进一步结果
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40252
I. Osinuga
{"title":"Further results on the classes of convex functions","authors":"I. Osinuga","doi":"10.4314/JONAMP.V11I1.40252","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40252","url":null,"abstract":"This paper presents more results on the classes of convex sets and functions. The results are follow-up to similar results obtained on the classes of convex sets and functions by [1] and [9]. These relationships were further shown among convex sets which were not considered in the above references and more results were proposed and proved. JONAMP Vol. 11 2007: pp. 515 - 518","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"96 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":"127996652","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
Mathematical model of the bacteria-nutrient dynamics 细菌-营养动力学的数学模型
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40207
S. Inyama
{"title":"Mathematical model of the bacteria-nutrient dynamics","authors":"S. Inyama","doi":"10.4314/JONAMP.V11I1.40207","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40207","url":null,"abstract":"In this paper we developed a Mathematical Model of bacteria-nutrient dynamics which results in a system of first order ordinary differential equations. The analysis of the model was done using dynamical systems. It was found out that the product of the maximum nutrient uptake per cel; and the number of cells produced per unit of nutrient uptake is a constant (VY = In 2). It is also shown that there is a linear relationship between the concentration of the limiting nutrients and number of bacteria with a negative slope. It is finally shown that after a long time, the number of bacterial will be a constant and will depend on the initial concentration of the nutrient and the initial number of bacterial. JONAMP Vol. 11 2007: pp. 145-148","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"49 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":"115157870","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
Age-pattern of blindness in Nigeria 尼日利亚失明的年龄模式
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40269
E. Nwogu
{"title":"Age-pattern of blindness in Nigeria","authors":"E. Nwogu","doi":"10.4314/JONAMP.V11I1.40269","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40269","url":null,"abstract":"This paper discusses age pattern of blindness in Nigerian. The ultimate objective is to provide information on which strategies for prevention and treatment of blindness, as well as the rehabilitation on which strategies for prevention and treatment of blindness, as well as the rehabilitation and integration of blind persons into social life could be based. This follows from the fact that most causes, preventive measures and treatment of blindness have been found to be associated with age. Secondary data drawn from the 1994 census of the Federal Republic of Nigeria was analysed using the methods of categorical data and regression analyses. Results show that the quality of data on age and sex on the blind population is very poor. From the census data the level of prevalence of blindness in Nigerian was shown to be grossly under-reported. It was also found that third degree polynomial appears to describe the age-pattern of blindness in Nigeria, though not adequately. The inadequacies were attributed to the distortions in the age reporting. Until further research proves otherwise, estimates of the age-specific prevalence of blindness based on the third degree polynomial has been recommended for use in developing strategies for addressing problems of blindness in Nigeria among others. JONAMP Vol. 11 2007: pp. 641-656","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":"130627891","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
Second derivative continuous linear multistep methods for the numerical integration of Stiff system of ordinary differential equations. 常微分方程刚性系统数值积分的二阶导数连续线性多步法。
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40210
F. Otunta, M. Ikhile, R. Okuonghae
{"title":"Second derivative continuous linear multistep methods for the numerical integration of Stiff system of ordinary differential equations.","authors":"F. Otunta, M. Ikhile, R. Okuonghae","doi":"10.4314/JONAMP.V11I1.40210","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40210","url":null,"abstract":"Continuous linear multi-step methods (CLMM) form a super class of linear multi-step methods (LMM), with properties that embed the characteristics of LMM and hybrid methods. This paper gives a continuous reformulation of the Enright [5] second derivative methods. The motivation lies in the fact that the new formulation offers the advantage of a continuous solution of the initial value problem (IVP) unlike the discrete solution generated from the Enright's methods. The success of these methods is in their attainable stiff stability characteristics useful for resolving the problem posed by stiffness in the IVP. In this regard we derive a family of variable order continuous second derivative hybrid methods for the solution of stiff initial value problems in ordinary differential equations. A numerical example is given to demonstrate the application of the methods. JONAMP Vol. 11 2007: pp. 159-174","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"110 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":"133471652","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
The effect of ammonia intercalation on the superconducting properties of the alkali-metal doped fulleride 氨插层对碱金属掺杂富勒化物超导性能的影响
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40242
F. Matthew-Ojelabi
{"title":"The effect of ammonia intercalation on the superconducting properties of the alkali-metal doped fulleride","authors":"F. Matthew-Ojelabi","doi":"10.4314/JONAMP.V11I1.40242","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40242","url":null,"abstract":"A theoretical investigation of the electronic properties of the relatively high-Tc alkali-metal doped superconducting fullerides when they are further exposed to ammonia molecules as dopants is presented. Our numerical method relies on a group theoretical technique for the formation of molecular orbitals (MO's) for the solid C60 using 60 radial atomic orbitals (AO's) derived in a previous work. We also take into consideration the fact that the Fermi energies of the fullerides compare favourably with their phonon energies in the choice of a Tc formula. The effect of the ammonia molecules, as intercalants, on the density of states at the Fermi level (N(ef)) and consequently superconductivity are then discussed\u0000 JONAMP Vol. 11 2007: pp. 455-460","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"21 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":"128223607","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
A mathematical model for the interception of a moving target: contribution to optimal controllability theory 拦截运动目标的数学模型:对最优可控性理论的贡献
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40262
A. Eyo
{"title":"A mathematical model for the interception of a moving target: contribution to optimal controllability theory","authors":"A. Eyo","doi":"10.4314/JONAMP.V11I1.40262","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40262","url":null,"abstract":"The sole aim of this work is to develop a mathematical model for dredging (excavating) three open channel sections, namely, the circular, parabolic and trapezoidal sections using the conditions for best hydraulic performance for the channels. Applying the model to a numerical example, new dimensions of the new channel for the three channel sections are determined and compared with the original ones, if the cross sectional area, bed slope and Manning's friction factor remain unchanged for each channel and if the side slopes are also stable with respect to the trapezoidal channel. Furthermore, a combination of our model with Darcy's formula can provide an alternative method for comparing the hydraulic performances of the three channel sections. JONAMP Vol. 11 2007: pp. 587-596","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"34 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":"133584769","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
Computational model for speed of efflux in liquids 液体射流速度的计算模型
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40206
E. Ikata, P. Eke, A. Ngiangia
{"title":"Computational model for speed of efflux in liquids","authors":"E. Ikata, P. Eke, A. Ngiangia","doi":"10.4314/JONAMP.V11I1.40206","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40206","url":null,"abstract":"We have looked at the efflux of a viscous liquid from an orifice. Assuming the steady flow of a Newtonian fluid, a model for the energy loss due to viscous shearing stress is derived, and a first-order non-linear ordinary differential equation of second degree is obtained for the speed of efflux. Numerically, the equation is quasi-stiff, due to the small value of kinematic viscosity of common liquids. We resolve the equation numerically using a modified Rosenbrock formula for the speed of efflux at different depths of the orifice, below the free surface of the liquid. Generally, the results show that the speed of efflux for a liquid with a large kinematic viscosity is lower than that for a liquid with a small kinematic viscosity at any particular depth. At a low hydrostatic pressure, the speed of efflux of a viscous liquid is less than that of an inviscid fluid. Thus there is a significant energy loss if the kinematic viscosity of a liquid is high. Also, the results suggest that liquids with a large kinematic viscosity are more likely to support steady flow if subject to a high pressure gradient. JONAMP Vol. 11 2007: pp. 137-144","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"78 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":"133638511","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
Pressure on the Cochlea as a Load on the basilar membrane: Its contribution to the mechanism of hearing 耳蜗压力作为基底膜负荷:对听力机制的贡献
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40259
G. Mbah, O. Adagba
{"title":"Pressure on the Cochlea as a Load on the basilar membrane: Its contribution to the mechanism of hearing","authors":"G. Mbah, O. Adagba","doi":"10.4314/JONAMP.V11I1.40259","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40259","url":null,"abstract":"A Mathematical model of the pressure equation was obtained and solved to show the effect of pressure as a load on the basilar membrane deformation (motion) and that the basilar membrane motion is in opposite direction to pressure (load) application on it. This means that when pressure is exerted on the basilar membrane, it pushes it down and vice versa. This movement of the basilar membrane also results in the movement of the Oval and Round windows which also move in opposite direction relative to the one another as well as to the load exerted on the basilar membrane. As expected, it was seen that the pressure difference at any point inside the cochlea and thus the basilar membrane is a function of the location of interest since x1 and x3 are implicated in the expression for the pressure difference. JONAMP Vol. 11 2007: pp. 557-570","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"20 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":"134534250","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
Incremental cryptography and security of public hash functions 增量加密和公共哈希函数的安全性
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40244
Tj Odule
{"title":"Incremental cryptography and security of public hash functions","authors":"Tj Odule","doi":"10.4314/JONAMP.V11I1.40244","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40244","url":null,"abstract":"An investigation of incremental algorithms for crytographic functions was initiated. The problem, for collision-free hashing, is to design a scheme for which there exists an efficient “update” algorithm: this algorithm is given the hash function H, the hash h = H(M) of message M and the “replacement request” (j, m), and outputs the hash H(M(j, m)) of the modified message. Ideally, the update time should depend only on the block size b and the underlying security parameter k, and not on the length of the message.\u0000 JONAMP Vol. 11 2007: pp. 467-474","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"38 2 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":"121872775","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
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