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OALib Journal期刊

ISSN: 2333-9721

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A Radiological Survey in Tailings: A Case Study of Rosterman Gold Mine, Western Kenya  [PDF]
Conrad Khisa Wanyama, John Wanjala Makokha, Fred Wekesa Masinde
Open Access Library Journal (OALib Journal) , 2020, DOI: 10.4236/oalib.1106293
Abstract: Thirty samples of tailing waste weighing 200 g were randomly collected from both active and inactive tunnels at the Rosterman gold mine site in western Kenya. The average activity concentration of the radionuclides (40K, 232Th and 238U) analyzed by the gamma-ray spectrometry in the tailing samples was 260 ± 14.29 Bq/Kg for 40K, 118 ± 8.25 Bq/Kg for 232Th and 81 ± 3.63 Bq/Kg for 238U. The corresponding radiological parameters for all the collected thirty tailing waste samples were determined from the specific mean activity concentrations. The average dose rate for all the samples was 54 nGy/h. The average radium equivalent value was 262 ± 12.04 Bq/Kg with a range of 154 ± 6.42 Bq/Kg to 350 ± 10.24 Bq/Kg. The average values of external and internal indices were 0.6 ± 0.03 mSv/y and 0.7 ± 0.04 mSv/y respectively. The average indoor and outdoor annual effective dose rates that were determined for this study were 0.3 ± 0.02 and 0.2 ± 0.01 respectively. Therefore, the tailing samples recorded doses and radiological indices below the world average permissible values. This implies that the radiation exposure to the miners and general public due to tailing wastes at Rosterman gold mine poses no significant health risk.
Women see little hope of anti-retroviral treatment yet
Wanyama Catherine
Bulletin of the World Health Organization , 2002,
Abstract:
Africa's largest measles vaccination campaign could reduce childhood mortality by 20%
Wanyama Catherine
Bulletin of the World Health Organization , 2002,
Abstract:
Augmenting the Participatory Design Concept in Systems Development
Indeje Wanyama,Zheng QIN
Management Science and Engineering , 2010,
Abstract: Participatory Design (PD) is an effective tool for designing organizational systems where views, aspirations and the input of both the system users and developers are sought and reconciled in the development of a system. This paper attempts to highlight and identify the fit between the Soft Systems Methodology (SSM) as applied in systems development and the tools of the Quality Function Deployment (QFD) as applied in manufacturing and how that fit does enhance Participatory Design in systems development. By recognizing the complementarities of the tools of these two approaches (SSM and QFD), we can enhance Participatory Design in systems development. Findings from literature review show that a comprehensive application of this concept is yet to be done in information systems development. The approach builds on the seven phases of Soft Systems Methodology by applying the Quality Function Deployment techniques to elicit information from complex and amorphous real-world situations to augment the Participatory Design process.Keywords: Participatory Design; Soft Systems Methodology; Quality Function Deployment; House of Quality
Stakeholder Perception of Information Systems Development Success in the Public Sector
Wanyama INDEJE,Zheng QIN
Management Science and Engineering , 2011,
Abstract: Definition of Information Systems (IS) success has eluded researchers over time with no readily acknowledged and acceptable success model. The models so far developed for IS success measure success from the viewpoint of the system, users, and the organization. The system viewpoint is measured by information quality, system quality, and service quality; the users’ viewpoint by user satisfaction, use, and individual net benefits; and the organization’s viewpoint by organizational net benefits. Moreover, the research done has mostly been in the private sector. This study attempts to add the development team’s viewpoint as well as public sector perspectives. This is done by conducting a qualitative case study of the implementation of an information system in the public service in Kenya. Unlike previous studies on IS success, this study acknowledges the fact that there is need for a model that can be used to evaluate systems during the development cycle as well as on projects that never reach completion or are never used. In addition, findings of the study identified key IS success variables relevant to the public sector and characteristics that distinguish the public from the private sector.
Passion for Beauty: A Model for Learning  [PDF]
Conrad Hughes
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.33053
Abstract: This essay investigates the idea that effective teaching entails a passion for the beauty of the subject matter being taught. The first part gives a summative overview of the last 72 years of constructivism with references to educational research and discussion on content, cognition and attitudes. This overview is set against the problem of increasing pressure on students and teachers in an age where university places are difficult to secure and students are not always motivated. The second part of the essay investigates the issue of student motivation. Forced learning will be discussed, the problems of trying to cater for student motivation through pedagogy and curriculum, and finally the idea of the muse, arguing that the most effective learning must involve some degree of passion for the subject from the teacher that the student integrates and appropriates. The conclusion of the essay considers passion for beauty as the core element of good learning and how this should be valorized openly and not seen as opposing constructivist pedagogy.
Mass-to-Energy Conversion, the Astrophysical Mechanism  [PDF]
Conrad Ranzan
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2019, DOI: 10.4236/jhepgc.2019.52030
Abstract: A new interpretation of the relativistic equation relating total-, momentum-, and mass-energies is presented. With the aid of the familiar energy-relationship triangle, old and new interpretations are compared. And the key difference is emphasized—apparent relativity versus intrinsic relativity. Mass-to-energy conversion is then brought about by adopting a three-part strategy: 1) Make the motion relative to the universal space medium. This allows the introduction of the concept of intrinsic energy (total, kinetic, and mass energies) as counterpart to the apparent version. 2) Recognize that a particle’s mass property diminishes with increase in speed. This means introducing the concept of intrinsic mass (which varies with intrinsic speed). 3) Impose a change in the particle’s gravitational environment. Instead of applying an electromagnetic accelerating force or energy in order to alter the particle’s total energy, there will simply be an environmental change. Thus, it is shown how to use relativity equations and relativistic motion—in a way that exploits the distinction between apparent and innate levels of reality—to explain the mass-to-energy-conversion mechanism. Moreover, the mechanism explains the 100-percent conversion of mass to energy; which, in turn, leads to an explanation of the mechanism driving astrophysical jets.
On conservation of the of crystal lattice symmetry in transition at Curie point in exchange magnets
Khisa Sh. Borlakov,Albert Kh. Borlakov
Physics , 2012,
Abstract: We show that symmetry of the crystal lattice of exchange magnets (containing only 3d magneto-active elements) does not change at the Curie point; only the magnetic symmetry of the crystal is decreasing in the transition point. In the non-exchange magnets (containing only rare-earth magneto-active elements), on the contrary, both the magnetic and crystal-chemical symmetry decrease at the Curie point. There is isotropic magnetic phase in exchange magnets; and their magnetic symmetry is described by color groups of magnetic symmetry of P-type. Non-exchange magnets do not have isotropic phase; their symmetry is described by color groups of magnetic symmetry of Q-type.
The problem of choosing of the group of symmetries of paramagnetic phase in the theory of magnetic phase transitions and the exchange multiplets
Khisa Sh. Borlakov,Albert Kh. Borlakov
Physics , 2012,
Abstract: It is shown that for the theoretical description of the magnetic and structural phase transitions in the magnetics with magnetoactive ions of transition metals within the framework of the Landau theory of phase transitions the exchange group GxO(3) should be chosen as the group of symmetry of paramagnetic phase. Such a choice allows to describe the transition from the paramagnetic phase into the isotropic magnetically ordered phase (at Tc), and the spin-orbit transition from the isotropic into the anisotropic phase (at T
Thermodynamically stable equal-module exchange magnetic classes
Khisa Sh. Borlakov,Albert Kh. Borlakov
Physics , 2012,
Abstract: It is shown that within the framework of application of the general scheme of the Landau theory of phase transitions to the magnetic crystals the equilibrium and stable equal-module exchange structures automatically appears in addition to the other magnetic states. No additional conditions such as the existence of the Andreev-Marchenko spin scalar are needed. Furthermore, they are not constrained by the dimensionality of irreducible representation as it typically takes place for the Andreev-Marchenko-type structures.
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