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Variation of basic density,calorific value and volumetric shrinkage within tree height and tree age of Ugandan grown Eucalyptus grandis wood

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Journal of Forestry Research 2021年第2期32卷 503-512页

作者： Owen Emmanuel Sseremba p.mugabi A.Y.Banana B.C.Wessels M.plessis Department of Forestry Biodiversity and TourismMakerere UniversityKampalaUganda Department of Forestry and Wood Science Stellenbosch UniversityStellenboschSouth Africa

Insufficient knowledge on Ugandan grown Eucalyptus grandis *** ex Maiden wood properties,high demand,and processing challenges led to a study into its physical *** obtained the variation of basic density(BD),calorific value(CV)and volumetric shrinkage(VS)within tree height and tree-age of ***,and its appropriate use based on these *** with good boles were harvested from Kabarole District in western Uganda to produce specimens as prescribed by British Standards and ASTM standard wood testing *** data reviews and statistical analysis using ANOVA,Tukey’s test and multivariate analysis were done to obtain property estimates and their variation within trees and amongst tree *** mean BD of *** is 413.6,380.5,471.0,and 501.1 kg m^(−3)at 3,6,9,and 12 years,respectively,showing significant increase with tree age(p=0.003).The pattern of BD with tree height showed a reduction with tree height although with higher values in the middle portion of the *** CV increases(p=0.014)with tree age and reduces with tree height with values of 14,560.32,15,447.3,16,079.11,and 16,932.6 kJ kg^(−1)at 3,6,9,and 12 years,*** percentage VS was 11.02,9.84,12.31,and 14.45 for 3-,6-,9-,and 12-year-old trees,respectively,and it did not vary significantly(p=0.088)with tree *** on these property values,*** wood could be used for scaffolding,light constructions and fuel wood *** seasoning needs to be longer with well monitored drying schedules to reduce seasoning defects caused by the high *** studies on strength properties,seasoning schedules,panel products properties and tree-age chemical variations would improve the knowledge about its wood quality and would enhance its efficient utilization.

关键词： Eucalyptus grandis Age Calorificvalue Basic density Volumetric shrinkage Wood

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The phenomenon of Neural Bursting and Spiking in Neurons: Morris-Lecar Model

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Applied Mathematics 2020年第3期11卷 203-226页

作者： Tahmineh Azizi Robert mugabi Institute of Computational Comparative Medicine Department of Anatomy and Physiology Department of Mathematics Kansas State University Manhattan KS USA Department of Diagnostic Medicine and Pathobiology College of Veterinary Medicine Kansas State University Manhattan KS USA

In this study, we explore the interesting phenomenon of firing spikes and complex dynamics of Morris-Lecar model. We consider a set of parameters such that the model exhibits a wide range of phenomenons. We investigate the influences of injected current and temperature on the spiking dynamics of Morris-Lecar model. Moreover, we study bifurcations, and computational properties of this neuron model. Also, we define a bound (Max and Min voltage) for membrane potential and a certain voltage value or threshold for firing the spikes. Studying the two co-dimension bifurcations demonstrates much more complicated behaviors for this single neuron model. We also describe the phenomenon of neural bursting, and investigate the dynamics of Morris-Lecar model as a square-wave burster, elliptic burster and parabolic burster.

关键词： Morris-Lecar Model Neural Bursting Firing Spike Bifurcation

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Global Sensitivity Analysis in physiological Systems

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Applied Mathematics 2020年第3期11卷 119-136页

pharmacokinetic models are mathematical models which provide insights into the interaction of chemicals with biological processes. During recent decades, these models have become central of attention in industry that caused to do a lot of efforts to make them more accurate. Current work studies the process of drug and nanoparticle (Nps) distribution throughout the body which consists of a system of ordinary differential equations. We use a tri-compartmental model to study the perfusion of Nps in tissues and a six-compartmental model to study drug distribution in different body organs. We have performed global sensitivity analysis by LHS Monte Carlo method using pRCC. We identify the key parameters that contribute most significantly to the absorption and distribution of drugs and Nps in different organs in body.

关键词： Global Sensitivity Analysis Latin Hypercube Sampling (LHS) partial Rank Correlation Coefficient (pRCC) physiological Systems Drug and Nps Distribution

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