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Search Results: 1 - 10 of 10888 matches for " Ndop Joseph "
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Displacements, Strains, and Stresses Investigations in an Inhomogeneous Rotating Hollow Cylinder Made of Functionally Graded Materials under an Axisymmetric Radial Loading  [PDF]
Elise Rose Atangana Nkene, Luc Leroy Mambou Ngueyep, Joseph Ndop, Emma Sandring Djiokeng, Jean-Marie Bienvenu Ndjaka
World Journal of Mechanics (WJM) , 2018, DOI: 10.4236/wjm.2018.83005
Abstract: In this paper, an analytical and numerical study of strain fields, stress fields and displacements in a rotating hollow cylinder, whose walls were completely made in Functionally Graded Materials (FGM), was conducted. We have considered the rotating hollow cylinder submitted to an asymmetric radial loading. It is assumed that, because of the functional graduation of the material, the mechanical properties such as Young elastic modulus and the density varies in the radial direction, in accordance with a the power law function. The inhomogeneity parameter was selected between -1 and 1. On the basis of the second law of Newton, Hooke’s law and the strain-stress relationship, we established the differential equation which governs the equilibrium for a rotating hollow cylinder. We found the analytical solution and compared to the numerical solution obtained by using the shooting method and the fourth order Runge-Kutta algorithm. The analytical and numerical results lead to the conclusion that the magnitude of the tangential stresses is greater than that of the radial stresses. The changes due to the graduation of FGM does not produce consistent variations in the distribution of radial stresses, but strongly affects the distribution of tangential stresses. The tangential stresses, tangential strains and displacements are much higher at the inner surface of the cylinder wall. The internal radial pressure intensely affects the radial stresses and the radial strain.
Density and Strength of Mortar Made with the Mixture of Wood Ash, Crushed Gneiss and River Sand as Fine Aggregate  [PDF]
Mambou Ngueyep Luc Leroy, Keyangue Tchouata Jules Hermann, Atangana Nkene Elise Rose, Ndop Joseph, Fotseu Miyo Christian Dupont, Ndjaka Jean-Marie Bienvenu
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.64012
Abstract: The main purpose of this paper is to study the feasibility of using wood bottom ash to partially replace natural fine aggregate or crushed gneiss sand in the manufacturing of mortars. The experiment uses wood ash as fine aggregates, which passes through 5 mm sieve, in proportions of 5%, 10%, 15%, 20% and 25% by weight to replace partially river sand and crushed gneiss, and the both sand of the same size as the aggregate respectively. Experimental results show that density of mortar and the compressive strength of mortar decrease globally with the increase in wood ash content. At 56 days, and for all replacements with wood ash, compressive strengths values of mortar obtained with the mixture of wood ash and river sand is greater than 20 MPa, which is not the case for mortar made with crushed gneiss and wood ash. Moreover, for 5% of replacement with wood ash, compressive strengths of mortar obtained with the mixture of wood ash and river sand and the mixture of wood ash and crushed gneiss are respectively 37 MPa and 32 MPa at 56 days. These values satisfied the strength requirements. Hence, 5% replacement of crushed gneiss with wood ash is suggested and could be benefit for mortar. In addition, the replacement of sand by wood ash is preferable with river sand which contains fewer fines than crushed gneiss. The compressive strength of mortar with 25% wood ash + river sand could be suitable.
Stationary Super-Gravitational States  [PDF]
Joseph Towe
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.21007
Abstract: The string background AdS7XS4 is adopted and the early universe is modeled in the eleven dimensional SUGRA theory that is dual to this background. Specifically the ground state of the vacuum is associated with an arbitrary distribution of closed, spin-2 strings, and excited states are modeled as geometric combinations of individual strings. Combinations or combining iterations are, by hypothesis, admissible or geometric if each iteration intrinsically incorporates the metrical scale that is assigned to the individual spin-2 string. It is demonstrated that a generalization of this process, if appropriately calibrated, establishes theoretical fermionic masses that correspond approximately to observed values. The proposed model also predicts a new quark of mass .
Using Multimedia Case Development as a Critical Reflective Tool for Revitalizing School Stakeholders’ Organizational Learning  [PDF]
Joseph Claudet
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23028
Abstract: This article reports design and development efforts associated with one school-university collaborative partnership project focused on assisting K-12 school community stakeholders struggling with difficult school improvement challenges learn how to reinvent themselves as organizational teams to engage effectively in positive school change and renewal. The project employs an alternative, immersive organizational learning design in conjunction with available multimedia technology to leverage stakeholders’ own lived experiences and leadership challenges as opportunities to engage school community participants in a unique organizational case development and team learning adventure. Multimedia case development and production activities involving school community stakeholders in one elementary school are highlighted. Insights derived from the use of multimedia case development as an organizational leading and learning tool for educators and other stakeholders in school communities are discussed.
The Photon Wave Function  [PDF]
Joseph Cugnon
Open Journal of Microphysics (OJM) , 2011, DOI: 10.4236/ojm.2011.13008
Abstract: The properties of a wave equation for a six-component wave function of a photon are re-analyzed. It is shown that the wave equation presents all the properties required by quantum mechanics, except for the ones that are linked with the definition of the position operator. The situation is contrasted with the three-component formulation based on the Riemann-Silberstein wave function. The inconsistency of the latter with the principles of quantum mechanics is shown to arise from the usual interpretation of the wave function. Finally, the Lorentz invariance of the six-component wave equation is demonstrated explicitly for Lorentz boosts and space inversion.
Redesigning Staff Development as Organizational Case Learning: Tapping into School Stakeholders’ Collaborative Potential for Critical Reflection and Transformative Leadership Action  [PDF]
Joseph Claudet
Open Journal of Leadership (OJL) , 2012, DOI: 10.4236/ojl.2012.14005
Abstract: This article reports on activities associated with one school-university partnership project focused on providing multimedia-integrated organizational learning and development opportunities to stakeholders in K-12 school communities struggling with real-world school change and improvement challenges. A central feature of the project’s organizational case learning design is the use of multimedia case production technology in conjunction with context-specific school situational data to immerse school stakeholders in the theatrical portrayal and analysis of their own school dilemma challenges as a means to jumpstart collaborative teaming and data-driven problem solving. Multimedia case development and analysis efforts involving stakeholders in one middle school community who are confronting a difficult, politically charged set of school improvement challenges are highlighted. Project findings associated with the use of multimedia technology and data-driven organizational case learning as tools to inform an alternative staff development approach for promoting positive school leadership teaming and real-world problem solving among education stakeholders in K-12 school communities are discussed.
On Approximating Fermion Masses in Terms of Stationary Super-String States  [PDF]
Joseph Towe
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.44076
Abstract:

AdS/CFT correspondence is adopted and fermion masses are modeled as analogues of Weyl curvature states, which occur by hypothesis when closed spin-2 strings sweep out closed world tubes. Admissible curvature states are established by gauge invariance and fundamental mass is attributed to admissible curvature. A consequent spectrum of masses forms an SU(3) symmetry that is invariant under appropriate realizations of the SUGRA GUT interaction. Finally the spin-h/2 nature of the masses that are attributed to curvature emerges as a necessary condition for the relevant SUGRA GUT realizations. Calibration of the proposed model reveals a spectrum of fermion masses that corresponds approximately to observation. Moreover, the proposed model predicts a new quark that is characterized by I3 = -1/2 and by a mass of about 30 GeV/c2.

Instructional Leadership and the Sociopolitics of School Turnarounds: Changing Stakeholder Beliefs through Immersive Collaborative Learning  [PDF]
Joseph Claudet
Advances in Applied Sociology (AASoci) , 2013, DOI: 10.4236/aasoci.2013.37035
Abstract: This article highlights case production and analysis efforts associated with a multi-year, multimedia case development project focused on providing alternative organizational learning opportunities to regional K-12 schools and school districts. The School Leadership Case Simulation (SLCS) Project utilizes a unique multi-entity partnership and school-based collaborative learning design in which teams of university-based education researchers, multimedia production specialists, and regional education service center school improvement consultants work in tandem with K-12 school educators and community members to help these school stakeholders develop and produce multimedia organizational learning cases about their own real-world, context-specific school dilemma challenges. Collaborative team learning efforts of one group of school educators and community stakeholders grappling with an organizationally entrenched set of instructional leadership and school improvement challenges in one regional high school community are presented. Project findings relating to the viability and usefulness of the project’s multi-entity, immersive collaborative teaming design and multimedia-integrated case learning tools for helping groups of K-12 school community stakeholders learn how to adopt a team-centered organizational learning approach to reframing their real-world school leadership dilemma challenges and engage directly in data-informed, collaborative decision-making are presented and discussed.
Real World Project Management: Do As I Say, Not As They Teach  [PDF]
Joseph Kasten
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.42017
Abstract:

Anecdotal evidence suggests that there is a stark contrast between the project management tools and techniques taught in schools and those actually used in industrial settings. This exploratory study provides evidence of those differences in the form of qualitative data collected from project managers in the information technology areas of major firms from the banking, cosmetics, and electronics manufacturing industries. Evidence suggests that there is a significant variation in which the formal project management processes taught in traditional project management curricula are used, if any. The study explores the reasons behind these differences and suggests possible approaches to ease the strain for new hires and current employees.

Index Fund Factor: The View beyond the Wall  [PDF]
Joseph Ojih
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29033
Abstract:

Index funds are those funds that seek to track the returns of the market benchmarks, such as the Wilshire 5000 and S & P 500 Index. Although many fund managers claim to outperform the market through experience and forecasting, a combination of cost savings, diversification and longevity had helped to keep index funds’ returns float to the top rankings. By using simple quantitative evidence, this paper explained in plain language how investing in index funds can help investors get ahead of the majority of fund managers in terms of consistent returns. The paper equally explained why index funds are likely to continue to outperform not only the average mutual funds but also the conventional stocks and bonds, both in the bull and bear markets.

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