In Vivo Antidiabetic Activities Of Polyherbal Extracts Against Streptozotocin-Nicotinamide Induced Type 2 Diabetic Mice Model,
2021
PDEA’S Seth Govind Raghunath Sable College of Pharmacy, Saswad, Maharashtra, India
In Vivo Antidiabetic Activities Of Polyherbal Extracts Against Streptozotocin-Nicotinamide Induced Type 2 Diabetic Mice Model, Pradnya Jagtap, Yashashri Nimbalkar, Vidya Patil, Ravindra Y. Patil
Tanzania Journal of Science
Diabetes mellitus is a chronic metabolic disorder and rapidly increasing cases of diabetes throughout the world are major concerns in both developed and developing countries. Currently available oral antidiabetic medicines have limitations in efficacy and safety, which in conjunction with the emergence of diabetes mellitus as a global epidemic have aided the popularity of alternative therapies to manage the disease safely and more efficiently. Herbal medicines are accepted as alternative therapies for blood sugar control. Gymnema sylvestre, Boerhavia diffusa, Tinospora cordifolia, and Argyreia nervosa are some potent herbs used for the management of diabetes. Mixing of these plants in different …
An Age-Structured Model For Transmission Dynamics Of Malaria With Infected Immigrants And Asymptomatic Carriers,
2021
Department of Mathematics, University of Dar es Salaam, P. O. Box 35062, Tanzania.
An Age-Structured Model For Transmission Dynamics Of Malaria With Infected Immigrants And Asymptomatic Carriers, Asha S Kalula, Eunice Mureithi, Theresia Marijani, Isambi Mbalawata
Tanzania Journal of Science
Abstract An age-structured (children and adults) model for the transmission dynamics of malaria with asymptomatic carriers and infected immigrants has been analyzed. We first analyze a model without infected immigrants. It shows that the disease-free equilibrium exists and is stable when and unstable for . Also, we compute the sensitivity indices of the basic reproduction number. The basic reproduction number is most sensitive to the mosquito biting rate. Besides, the sensitivity of the basic reproduction number shows that the children's class parameters are more sensitive than those of adults. In the presence of infected immigrants, the model does not admit …
High Speed Hill Climbing Algorithm For Portfolio Optimization,
2021
University of Dar es Salaam, College of Information and Communication Technology, Department of Electronics and Telecommunications, P. O. Box 33335, Dar es Salaam, Tanzania.
High Speed Hill Climbing Algorithm For Portfolio Optimization, Collether John
Tanzania Journal of Science
Portfolio can be defined as a collection of investments. Portfolio optimization usually is about maximizing expected return and/or minimising risk of a portfolio. The mean-variance model makes simplifying assumptions to solve portfolio optimization problem. Presence of realistic constraints leads to a significant different and complex problem. Also, the optimal solution under realistic constraints cannot always be derived from the solution for the frictionless market. The heuristic algorithms are alternative approaches to solve the extended problem. In this research, a heuristic algorithm is presented and improved for higher efficiency and speed. It is a hill climbing algorithm to tackle the extended …
Spatial Modelling For Cholera Incidence Rates In Morogoro Municipality, Tanzania,
2021
Department of Population Studies, Institute of Rural Development Planning, Dodoma, Tanzania
Spatial Modelling For Cholera Incidence Rates In Morogoro Municipality, Tanzania, Caroline Ngereza, Rosalia S. Katapa, Ali R. Mniachi
Tanzania Journal of Science
Spatial modelling was conducted to examine community factors associated with cholera incidence rates in Morogoro Municipality. The study employed both secondary (cholera cases) and primary (geographic coordinates of community risk factors) data. Spatial lag model was applied in examining association between the variables. All wards of Morogoro Municipality were considered in the study to capture their variations because cholera cases have a tendency to be clustered. Results indicated that market density, distance to the market and distance to the dumpster are significant factors associated with cholera incidence rates in the wards (p < 0.05). Geographically weighted Poisson model was used to show the variations of those factors between the wards in Municipality. A statistically significant positive association of cholera incidence rates; and market density was only found in Mazimbu ward (p < 0.05) and distance from the community to the dumpster was found in Kihonda, Kingolwira, Bigwa, Kichangani, Kilakala and Boma wards (p < 0.001) and some wards at the centre of the municipality which are Mji Mkuu and Kingo (p < 0.05). A statistically significant negative association of cholera incidence rates and distance from the centre of the community to the market was found in Kihonda, Kingolwira and Kichangani (p < 0.001) and Bigwa wards (p < 0.05). Therefore, measures taken to control and prevent cholera disease should base on the variations of the risk factors found in the Municipal wards. Keywords: Cholera incidence rate, Spatial lag regression model, Community risk factor, Geographically weighted Poisson model
Determination Of Quantile Range Of Optimal Hyperparameters Using Bayesian Estimation,
2021
Department of Mathematics, Tai Solarin University of Education Ijagun, P.M.B. 2118, Ijebu-Ode Ogun State Nigeria.
Determination Of Quantile Range Of Optimal Hyperparameters Using Bayesian Estimation, Ayoade I. Adewole, Olusoga A. Fasoranbaku
Tanzania Journal of Science
Bayesian estimations have the advantages of taking into account the uncertainty of all parameter estimates which allows virtually the use of vague priors. This study focused on determining the quantile range at which optimal hyperparameter of normally distributed data with vague information could be obtained in Bayesian estimation of linear regression models. A Monte Carlo simulation approach was used to generate a sample size of 200 data-set. Observation precisions and posterior precisions were estimated from the regression output to determine the posterior means estimate for each model to derive the new dependent variables. The variances were divided into 10 equal …
Bayesian Hetero-Elasticnet (A Gibbs Sampler Approach),
2021
Department of Statistics, University of Ilorin, P.M.B. 1515 Ilorin, Nigeria
Bayesian Hetero-Elasticnet (A Gibbs Sampler Approach), Isiaka Oloyede
Tanzania Journal of Science
Combined heteroscedasticity and multicollinearity as dual non-spherical disturbances were experimented asymptotically. A Gibbs Sampler technique was used to investigate the asymptotic properties of hetero-elasticnet estimator with mean squares error (MSE) and bias as performance metrics. The seed was set to 12345; is set at ; Xs variables were generated as follow: the design matrix was generated from the multivariate normal distribution with mean > 0 and variance . and are truncated with Harvey (1976) heteroscedastic error structure; are collinear covariate with pairwise correlation between 0.6 and 0.9, the sample sizes were 25, 100 and 1000. The number of replications of the …
Weighted Statistical A-Optimal Designs For Two-Variable Poisson Regression Model With Application To Fertility Studies,
2021
Department of Statistics, Federal University of Technology, Akure, P.M.B. 704, Akure, Ondo State, Nigeria
Weighted Statistical A-Optimal Designs For Two-Variable Poisson Regression Model With Application To Fertility Studies, Emmanuel Idowu Olamide, Femi Barnabas Adebola, Olusoga Akin Fasoranbaku
Tanzania Journal of Science
This research extends design optimization to model involving count data. A two-variable Poisson regression model was investigated for A-optimality on a constrained design space and the weights of the optimal design points were obtained. The constructed designs were verified to be A-optimal at 4-point design through the general equivalence theorem. The efficiency of the constructed optimal design was found to be 100% A-efficient. The concept of weighted optimal designs for Poisson regression model was applied to fertility studies. Approximate A-optimal design weights of educational level of women were obtained for each marriage duration period with respect to their places of …
E-Optimal Experimental Designs For Poisson Regression Models In Two And Three Variables,
2021
Department of Statistics, Federal University of Technology, Akure, Nigeria
E-Optimal Experimental Designs For Poisson Regression Models In Two And Three Variables, Emmanuel Idowu Olamide, Olusoga Akin Fasoranbaku, Femi Barnabas Adebola
Tanzania Journal of Science
In the context of generalized linear models, most of the recent studies were on logistic regression models and many of them focussed on optimal experimental designs with concentration on D-optimality. In this research, two- and three-variable Poisson regression models were considered for E-optimization on restricted design space [0, 1]. The two-variable Poisson regression model was not optimal at 3-design points, but was found to be E-optimal at 4-design points (1, 1), (0, 0), (0, 1) and (1, 0) with equal design weights of 0.25. The three-variable Poisson regression model was E-optimal at 4-design points (0, 0, 1), (0, 1, 0), …
Elegant Iterative Methods For Solving A Nonlinear Matrix Equation X-A^* E^X A=I,
2021
Department of Mathematics, Physics and Informatics, Mkwawa University College of Education P. O. Box 2513, Iringa, Tanzania.
Elegant Iterative Methods For Solving A Nonlinear Matrix Equation X-A^* E^X A=I, Chacha S Chacha
Tanzania Journal of Science
The nonlinear matrix equation was solved by Gao (2016) via standard fixed point method. In this paper, three more elegant iterative methods are proposed to find the approximate solution of the nonlinear matrix equation namely: Newton’s method; modified fixed point method and a combination of Newton’s method and fixed point method. The convergence of Newton’s method and modified fixed point method are derived. Comparative numerical experimental results indicate that the new developed algorithms have both less computational time and good convergence properties when compared to their respective standard algorithms. Keywords: Hermitian positive definite solution, nonlinear matrix equation, modified fixed point …
Commuting Isometries And Invariant Subspaces In Several Variables.,
2021
Indian Statistical Institute
Commuting Isometries And Invariant Subspaces In Several Variables., Sankar T. R. Dr.
Doctoral Theses
A very general and fundamental problem in the theory of bounded linear operators on Hilbert spaces is to find invariants and representations of commuting families of isometries.In the case of single isometries this question has a complete and explicit answer: If V is an isometry on a Hilbert space â„‹, then there exists a Hilbert space Hu and a unitary operator U on â„‹u such that V on â„‹u and[ S ⊗ IW 0 0 U] ∈ B((l 2 (ℤ+) ⊗ W) ⊕ â„‹u),are unitarily equivalent, whereW = ker V∗ ,is the wandering subspace for V and S is the …
Transfer Of Regularity For Markov Semigroups By Using An Interpolation Technique,
2021
LAMA (UMR CNRS, UPEMLV, UPEC), MathRisk INRIA, Université Gustave Eiffel, France
Transfer Of Regularity For Markov Semigroups By Using An Interpolation Technique, Vlad Bally, Lucia Caramellino
Journal of Stochastic Analysis
No abstract provided.
Integration By Parts Formula On Solutions To Stochastic Differential Equations With Jumps On Riemannian Manifolds,
2021
Osaka City University, Osaka, 558-8585, Japan
Integration By Parts Formula On Solutions To Stochastic Differential Equations With Jumps On Riemannian Manifolds, Hirotaka Kai, Atsushi Takeuchi
Journal of Stochastic Analysis
No abstract provided.
On The Exponential Moments Of Additive Processes,
2021
Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
On The Exponential Moments Of Additive Processes, Tsukasa Fujiwara
Journal of Stochastic Analysis
No abstract provided.
The Formation Mechanism Of China's Export Container Freight Rate,
2021
World Maritime University
The Formation Mechanism Of China's Export Container Freight Rate, Yuchao Liu
World Maritime University Dissertations
No abstract provided.
Research On The International Linkage Of Chinese Oil Tanker Transport Market Based On The Theory Of New Economic Geospatial,
2021
World Maritime University
Research On The International Linkage Of Chinese Oil Tanker Transport Market Based On The Theory Of New Economic Geospatial, Cheng Miao
World Maritime University Dissertations
No abstract provided.
Forecasting The Recovery Of The International Container Shipping Market In The Presence Of Covid-19,
2021
World Maritime University
Forecasting The Recovery Of The International Container Shipping Market In The Presence Of Covid-19, Tengrongre Wang
World Maritime University Dissertations
No abstract provided.
Research On Shanghai Export Container Freight Index Fluctuation Based On Arma-Garch-X Model,
2021
World Maritime University
Research On Shanghai Export Container Freight Index Fluctuation Based On Arma-Garch-X Model, Weihang Xu
World Maritime University Dissertations
No abstract provided.
Research On Multimodal Transport Documents Under One Belt One Road,
2021
World Maritime University
Research On Multimodal Transport Documents Under One Belt One Road, Wenshuo Cui
World Maritime University Dissertations
No abstract provided.
Investment Value Analysis Of China's Participation In Port Projects Along The 21st Century Maritime,
2021
World Maritime University
Investment Value Analysis Of China's Participation In Port Projects Along The 21st Century Maritime, Xin Zhang
World Maritime University Dissertations
No abstract provided.
Research On The Development Of Shipping Alliance,
2021
World Maritime University
Research On The Development Of Shipping Alliance, Xudong Zhao
World Maritime University Dissertations
No abstract provided.
