11351 research outputs found
Sort by
Comparative Analysis on Angular Flow and Mass Transfer in Haemodialysis
Get PDFHealthy kidney cleans blood and removes unwanted materials in the form of urine. When the kidney does not work properly, dialysis is one of the best solutions. Dialysis required if unhealthy kidney does not remove enough wastes and fluid from the blood. This usually happens when only 10 - 15 % of kidney’s function left. A dialyzer is used to clean blood. In an attempt to address clinical and experimental discrepancies, compartmental theoretical models have been used. Noda et al. (1979) were among the first to introduce a theoretical model on mass transfer using countercurrent flows. Their proposed model assumes an ideal flow distribution of the hollow fibers. Since diffusion is the main mechanism, c(r; t) has been denoted as the concentration of a solute per unit volume at the point r and time t. In this paper, instead of time, we have proposed a new parameter for the concentration of the solute, which is independent of time. Results reveal the behavior of concentration of urea in terms of eigenvalues which depends on angular flow
Training and Development Need Ranking of a Hotel Manager using Fuzzy Technique for Order Preference by Similarity to Ideal Solution
Get PDFRegular training and development programs are necessary to learn or improve skills and knowledge of the employees, as it has long term positive effect on the prosperity or success of the organization. For this, organization searches out the employees to whom training may be given as per their need. As every organization has different needs, various criteria and alternatives are determined by the group of decision makers. In this paper, multi-criteria group decision making model is considered, where various training and development needs of a hotel manager have been identified by group of decision makers and ranked with simplified fuzzy technique for order preference by similarity to ideal solution (Fuzzy TOPSIS) method. Results are reported with application on the basis of closeness coefficient using triangular and trapezoidal fuzzy number. Results showed that the ranking by Fuzzy TOPSIS is same, by using triangular and trapezoidal fuzzy number and can be successfully used to rank the appropriate training and development need required by the manager of hotel
On Nonlinear Contractions in New Extended -Metric Spaces
Get PDFVery recently, the notion of extended -metric spaces was introduced by replacing the modified triangle inequality with a functional triangle inequality and the analog of the renowned Banach fixed point theorem was proved in this new structure. In this paper, continuing in this direction, we further refine the functional inequality and establish some fixed point results for nonlinear contractive mappings in the new setting. A nontrivial example for the new extended -metric space is given
Summation Formulas for the Confluent Hypergeometric Function , Φ_ 2^(2r) of Several Variables
Get PDFIn this paper, we establish a general summation formula for the confluent hypergeometric function Φ2(2r) of several variables by applying the generalized Kummer’s summation theorem due to Lavoie et al. As an applications of our main result, we obtain certain new summation formulas for the confluent hypergeometric function Φ24 . Also some summation and transformation formulas including a results obtained recently by Choi and Rathie have been obtained as special cases
On the Weighted Pseudo Almost Periodic Solutions of Nicholson’s Blowflies Equation
Get PDFThis study is concerned with the existence, uniqueness and global exponential stability of weighted pseudo almost periodic solutions of a generalized Nicholson’s blowflies equation with mixed delays. Using some differential inequalities and a fixed point theorem, sufficient conditions were obtained for the existence, uniqueness of at the least a weighted pseudo almost periodic solutions and global exponential stability of this solution. The results of this study are new and complementary to the previous ones can be found in the literature. At the end of the study an example is given to show the accuracy of our results
New Lie group of transformation for the non-Newtonian fluid flow narrating differential equations
Get PDFIn this endeavour, a new Lie point of transformation for the fluid flow narrating differential equations are proposed. For this purpose a non-Newtonian fluid named tangent hyperbolic fluid is considered towards the flat surface in a magnetized flow field. In addition, equation of concentration admits the role of chemically reactive species. A mathematical model in terms of the coupled PDE’s is constructed. Lie group of analysis is implemented to yield the new Lie point of transformation for tangent hyperbolic fluid flow narrating differential equations when the heat and mass transfer individualities are considered. The resultant system of PDE’s is reduced into system of ODE’s via obtained set of transformation. The self-coded computational scheme is accomplished and the outcomes are reported by way of graphs. It is noticed that tangent hyperbolic fluid velocity, temperature and concentration is decreasing function of magnetic field parameter, Prandtl number and chemical reaction parameter respectively
Evaluation of chemical composition of Byrsocarpus dinklagei: An uncommon indigenous spice consumed in south-eastern Nigeria
No full textBackground: Spices especially in form of herbs and leaves, are commonly used in food preparation in eastern Nigeria. However, they are not usually accounted for in the nutritional content of foods. Byrsocarpus dinklagei is one of the uncommon aromatic spices added to cooked food for enhanced organolpetic properties and health purposes. Objective: This study evaluated the proximate, vitamins and phytochemical compositions of B. dinklagei (efu) spice. Methods: Seeds of B. dinklagei were dried in a cabinet dryer at 70oC to a constant weight and pulverized to powder. The ground powder was evaluated for proximate, vitamins and phytochemical compositions using standard methods. Data obtained was analyzed for mean and standard deviation. Results: The results showed that the spice contained 4.14% protein, 20.54% moisture, 2.19% fat, 1.83% ash, 1.94% crude fiber and 74.71% carbohydrate. Byrsocarpus dinklagei seeds powder contained 19.60 mg/100g of vitamin B2, 9.09 mg/100g vitamin C and 1.60 mg/100g of beta carotene. The mineral contents per 100g were 3.3mg Mg, 14.10 mg K, 0.9mg Na, 1.0 mg Ca, 212.0mg Mn, 598.0 mg Fe, 72 mg Cu and 144.0 mg Zn. The identified phytochemical content of B. dinklagei were 8.50 mg/100g of tannin, 115.10 mg/100g of alkaloid, 57.60 mg/100g of flavonoid, 21.00 mg/100g of saponin, 41.1 mg/100g of phytate and 25.00 mg/100g. Terpene profilr showed the presence of alpha-pinene, beta-myrcene, delta 3-carene, limonene, and rho-cymene as the main terpenes detected in the spice with a total terpene content of 50.70 mg/100g. Conclusion: The spice powder is a rich source of micronutrients and phytochemicals of biological significance
Generalized functions in the qualitative study of heterogeneous populations
No full textSolutions from non-smooth functional spaces, including generalized functions and measures, often appear in optimal control theory but are avoided in applications. They are however useful in finding the optimal distribution of investments into new and old capital equipment under improving technology. The corresponding economic problem involves optimal control in a linear Lotka-McKendrik model of age-structured population. Optimal solutions do not exist in normal functional classes and, so, generalized functions are used to construct the solutions. The optimal age-distributions of capital and investment include the Dirac function and are interpreted as instantaneous investment in equipment of certain age. A numerical simulation completes the presentation of the dynamics
Graphics Processing Unit (GPU) Performance Optimization: Post Moore’s Law Era
No full textTransistors have been increasing the graphics processing unit’s (GPU) performance since GPUs were first used to conduct scientific research. Currently, Moore’s law is becoming less relevant, and transistors are no longer able to bring a notable performance boost to the GPU. This study outlines different ways that the GPU’s performance can be improved without depending on transistors. In particular, this study focuses on problems associated with the GPU and proposes solutions that help correct those problems. When the GPU is executing dynamic parallelism and fine grain synchronization applications, the GPU performance can decline. To help improve the GPU execute those applications, this study introduces a dynamic parallelism management design and a fine grain synchronization management design. The dynamic parallelism management design and the fine grain synchronization management design are able to bring a 39% and 26% speedup performance improvement for the GPU, respectively. This study also explores a non-uniform memory access (NUMA) based GPU, which is a post Moore’s law era GPU. However, the NUMA based GPU has a problem serving memory requests, which causes it not to reach its full performance potential. To help the NUMA based GPU better serve memory requests, this study introduces several units for the NUMA based GPU. By implementing the units to the NUMA based GPU, the execution time improved by 32%
Advances in Cryopreservation of Bull Sperm
No full textCryopreservation of semen and artificial insemination have an important, positive impact on cattle production, and product quality. Through the use of cryopreserved semen and artificial insemination, sperm from the best breeding bulls can be used to inseminate thousands of cows around the world. Although cryopreservation of bull sperm has advanced beyond that of other species, there are still major gaps in the knowledge and technology bases. Post-thaw viability of sperm is still low and differs significantly among the breeding bulls. These weaknesses are important because they are preventing advances both in fundamental science of mammalian gametes and reproductive biotechnology. Various extenders have been developed and supplemented with chemicals to reduce cryodamage or oxidative stress with varying levels of success. More detailed insights on sperm morphology and function have been uncovered through application of advanced tools in modern molecular and cell biology. This article provides a concise review of progress in the cryopreservation of bull sperm, advances in extender development, and frontiers using diverse techniques of the study of sperm viability. This scientific resource is important in animal biotechnology because with the advances in discovery of sperm fertility markers, there is an urgent need to improve post-thaw viability and fertility of sperm through enhanced cryopreservation for precision agriculture to produce food animals to ensure food security on the global scale