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Productivity Challenge of Soils Along the Slopes of Mount Oku in Cameroon
Issue:
Volume 5, Issue 1, June 2019
Pages:
1-7
Received:
6 September 2018
Accepted:
6 October 2018
Published:
2 April 2019
Abstract: Soil fertility is the major determinant of output in Oku today. The objective of this study is based on the techniques used by rural farmers to maximize output on an advanced deteriorating soil. This phenomenon has not only impinged on output but limits the quality of food available to this agricultural dependent people. Over the years, soil constituents became exhausted as a result of continuous cultivation. The planting of Leucaena and Tephrosia tree species in farms played a challenging role in ameliorating output. The methodology adopted by this study centered on the administration of questionnaires, observation, interviews and field visits. A total of 38 Leucaena and Tephrosia trees were counted on four nearby farms. In these farms selected maize seeds were planted at regular ring distance around the trees. The results obtained revealed that, quality maize was harvested at closer perimeter to the soil fertilizer trees. This strategy maximized sustainable soil management and promoted agro forestry activities in Oku. The study concluded that soil fertility is improved upon by planting soil fertilizer trees in farms. At least one of these tree species is identified in farms in Oku.
Abstract: Soil fertility is the major determinant of output in Oku today. The objective of this study is based on the techniques used by rural farmers to maximize output on an advanced deteriorating soil. This phenomenon has not only impinged on output but limits the quality of food available to this agricultural dependent people. Over the years, soil consti...
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A Wind Climate Dynamic Modeling and Control Using Weibull and Extreme Value Distribution System
Tim Chen,
Alfred Hausladen,
Jonathan Sstamler,
Dneil Granger,
Abu Hurayraasiv Khanand,
Johncy Cheng,
Cwc Chen,
Chariklia Ageorgopoulou Kyriakos
Issue:
Volume 5, Issue 1, June 2019
Pages:
8-14
Received:
4 December 2018
Accepted:
26 February 2019
Published:
8 April 2019
Abstract: The dynamics of wind velocity data modeling plays a crucial role for the estimation of wind load and wind energy. Apart from these, the same modeling must also be used in the load cycle analysis of fatigue failure in slender structures to address periodic vortex shedding. Most authors fitted wind velocities of various locations using Weibull model. However, they did not check the validity of the model in describing the range of extreme wind velocity, which is not clear from the usual graphical representation. In this work, the validity of Weibull model for describing parent as well as extreme hourly mean wind velocity data for four places on the east coast of India has been checked; Weibull model has been found to become inappropriate for describing wind velocity in the range of extremes.
Abstract: The dynamics of wind velocity data modeling plays a crucial role for the estimation of wind load and wind energy. Apart from these, the same modeling must also be used in the load cycle analysis of fatigue failure in slender structures to address periodic vortex shedding. Most authors fitted wind velocities of various locations using Weibull model....
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A Class of Exact Solutions for a Variable Viscosity Flow with Body Force for Moderate Peclet Number ViaVon-Mises Coordinates
Issue:
Volume 5, Issue 1, June 2019
Pages:
15-25
Received:
13 March 2019
Accepted:
7 May 2019
Published:
4 June 2019
Abstract: The objective of this article is to communicate a class of new exact solutions of the plane equation of momentum with body force, energy and continuity for moderate Peclet number in von-Mises coordinates. Viscosity of fluid is variable but its density and thermal conductivity are constant. The class characterizes the streamlines pattern through an equation relating two continuously differentiable functions and a function of stream function ψ. Applying the successive transformation technique, the basic equations are prepared for exact solutions. It finds exact solutions for class of flows for which the function of stream function varies linearly and exponentially. The linear case shows viscosity and temperature for moderate Peclet number for two variety of velocity profile. The first velocity profile fixes both the functions of characteristic equation whereas the second keeps one of them arbitrary. The exponential case finds that the temperature distribution, due to heat generation, remains constant for all Peclet numbers except at 4 where it follows a specific formula. There are streamlines, velocity components, viscosity and temperature distribution in presence of body force for a large number of the finite Peclet number.
Abstract: The objective of this article is to communicate a class of new exact solutions of the plane equation of momentum with body force, energy and continuity for moderate Peclet number in von-Mises coordinates. Viscosity of fluid is variable but its density and thermal conductivity are constant. The class characterizes the streamlines pattern through an ...
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The Influences of Optical Forces on the Lattice Structure of Electrorheological Suspensions
Issue:
Volume 5, Issue 1, June 2019
Pages:
26-29
Received:
23 August 2018
Accepted:
11 September 2018
Published:
20 June 2019
Abstract: In order to investigate the influences of the optical forces on the lattice structure of an electrorheological (ER) suspension, on the basis of the experiment of Michael M. Burns etal., comparing their sample with an Electrorheological suspension, this paper substantially discusses the influences of intense light beams on the interaction between the dielectric particles immersed in electrorheological suspensions (ER). It respectively calculates out the optical forces exerted either on the polystyrene spheres in the sample of Michael M. Burns etal. Or on the corn-starch spheres in an ER suspension, the calculation results of this paper show that increasing the intensities of the incident laser beams or the gradient of the applied electric field can generate stronger optical forces acting on the spherical dielectric particles in an ER fluid than acting on those spheres with nearly the same mass and figuration in the suspension sample of Michael M. Burns etal.. Similar to the experimental result of Michael M. Burns et al., when increasing the intensities of the incident laser beams or the gradient of the electric field up to a critical value, it will give rise to the optical crystallization and optical binding of ER suspensions.
Abstract: In order to investigate the influences of the optical forces on the lattice structure of an electrorheological (ER) suspension, on the basis of the experiment of Michael M. Burns etal., comparing their sample with an Electrorheological suspension, this paper substantially discusses the influences of intense light beams on the interaction between th...
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