03544nam 2200661 a 450 991045220620332120200520144314.09956-790-80-X9956-790-92-3(CKB)2550000001102566(EBL)1318529(OCoLC)854520713(SSID)ssj0001101180(PQKBManifestationID)11604371(PQKBTitleCode)TC0001101180(PQKBWorkID)11066685(PQKB)11673471(MiAaPQ)EBC1318529(MdBmJHUP)muse30256(PPN)198685793(Au-PeEL)EBL1318529(CaPaEBR)ebr10736219(CaONFJC)MIL505049(OCoLC)857064027(EXLCZ)99255000000110256620130807d2013 uy 0engur|n|---|||||txtccrLeveraging educational quality in Southern African educational systems[electronic resource] a practitioners' perspective /edited by Munyaradzi Mawere & Patient RambeMankon, Bamenda, Cameroon Langaa Research & Pub. CIG20131 online resource (296 p.)Description based upon print version of record.9956-790-87-7 1-299-73798-6 Includes bibliographical references.section I. Primary and secondary education -- section II. Tertiary education -- section III.In the last two decades, erosion in the quality and effectiveness of education systems especially in sub-Saharan Africa has been compounded by factors -such as exogenous pressures precipitated by unsystematic provision of foreign aid - fostering corrupt practices, inadequate teacher training and limited deployment of professional educators to under-served communities. Yet, quality education is needed to attain high levels of critical thinking, analytic interpretation, academic creativity, innovativeness, effectiveness, personal and inter-personal skills in problem solving. This book, which focuses on Mozambique, South Africa, Zambia and Zimbabwe, critically reflects on primary, secondary and tertiary education in Southern Africa with a view to explore the opportunities, constraints and challenges that practitioners, learners and other educational stakeholders face in their daily lives. The book draws on the findings from the aforementioned countries, to advance the thesis that education in sub-Saharan Africa faces problems of epic proportions that require urgent attention. Hence, the primary objective of this book is to serve as a drive and medium for informed change, critical thinking, constructive analysis, synthesis and evaluation of different situations, settings and problems situated in the interface of theory and practice in the education fraternity.Education, ElementarySouth AfricaEducation, SecondarySouth AfricaEducation and stateSouth AfricaElectronic books.Education, ElementaryEducation, SecondaryEducation and state378.6378.60905Mawere Munyaradzi857215Rambe Patient955613MiAaPQMiAaPQMiAaPQBOOK9910452206203321Leveraging educational quality in Southern African educational systems2162598UNINA05143nam 2200625Ia 450 991083098210332120230421044612.01-281-75849-397866117584933-527-61485-03-527-61484-2(CKB)1000000000377527(EBL)482051(OCoLC)261344658(SSID)ssj0000222467(PQKBManifestationID)11190563(PQKBTitleCode)TC0000222467(PQKBWorkID)10174086(PQKB)11377726(MiAaPQ)EBC482051(EXLCZ)99100000000037752719960806d1996 uy 0engur|n|---|||||txtccrPlasma-spray coating[electronic resource] principles and applications /Robert B. Heimann2nd ed.Weinheim ;New York VCHc19961 online resource (356 p.)Description based upon print version of record.3-527-29430-9 Includes bibliographical references and index.Plasma- Spray Coating; Contents; List of Symbols and Abbreviations; 1 Introduction; 1.1 Coatings in the Industrial Environment; 1.2 Surface Coating Techniques; 1.3 Brief History of Thermal Spraying; 1.4 Synergistic Nature of Coatings; 1.5 Applications of Thermally Sprayed Coatings; References; 2 Principles of Thermal Spraying; 2.1 Characterization of Flame versus Plasma Spraying; 2.2 Concept of Energy Transfer Processes; 2.3 Unique Features of the Plasma Spray Process; References; 3 The First Energy Transfer Process: Electron-Gas Interactions; 3.1 The Plasma State3.1.1 Characteristic Plasma Parameters3.1.1.1 Langmuir Plasma Frequency; 3.1.1.2 Debye Screening Length; 3.1.1.3 Landau Length; 3.1.1.4 Collision Path Length; 3.1.1.5 Collision Frequency; 3.1.2 Classification of Plasmas; 3.1.2.1 Low Density Plasmas; 3.1.2.2 Medium Density Plasmas; 3.1.2.3 High Density Plasmas; 3.1.3 Equilibrium and Nonequilibrium Plasmas; 3.1.4 Maxwellian Distribution of Plasma Energies; 3.1.5 Equilibrium Compositions of Plasma Gases (Phase Diagrams); 3.2 Plasma Generation; 3.2.1 Plasma Generation through Application of Heat; 3.2.2 Plasma Generation through Compression3.2.3 Plasma Generation by Radiation3.2.4 Plasma Generation by Electric Currents (Gas Discharges); 3.2.4.1 Glow Discharges; 3.2.4.2 Arc Discharges; 3.2.4.3 Modeling of the Arc Column; 3.2.4.4 Structure of the Arc Column; 3.3 Design of Plasmatrons; 3.3.1 Arc Discharge Generators and their Applications; 3.3.1.1 Electrode-supported Plasmas; 3.3.1.2 Electrodeless Plasmas; 3.3.1.3 Hybrid Devices; 3.3.2 Stabilization of Plasma Arcs; 3.3.2.1 Wall-stabilized Arcs; 3.3.2.2 Convection-stabilized Arcs; 3.3.2.3 Electrode-stabilized Arcs; 3.3.2.4 Other Stabilization Methods3.3.3 Temperature and Velocity Distribution in a Plasma Jet3.3.3.1 Turbulent Jets; 3.3.3.2 Quasi-laminar Jets; 3.4 Plasma Diagnostics: Temperature, Enthalpy, and Velocity Measurements; 3.4.1 Temperature Measurements; 3.4.1.1 Spectroscopic Methods; 3.4.1.2 Two-wavelength Pyrometry; 3.4.2 Velocity Measurements; 3.4.2.1 Enthalpy Probe and Pitot Tube Techniques; 3.4.2.2 Laser Doppler Anemometry (LDA); 3.4.2.3 Other Methods; References; 4 The Second Energy Transfer Process: Plasma-Particle Interactions; 4.1 Injection of Powders; 4.2 Feed Material Characteristics4.2.1 Solid Wires, Rods and Filled Wires4.2.2 Powders; 4.2.2.1 Atomization; 4.2.2.2 Fusion and Crushing; 4.2.2.3 Compositing; 4.2.2.4 Agglomeration; 4.3 Momentum Transfer; 4.3.1 Connected Energy Transmission; 4.3.2 Modeling of Momentum Transfer; 4.3.3 Estimation of the Drag Coefficient; 4.3.4 Surface Ablation of Particles; 4.4 Heat Transfer; 4.4.1 Heat Transfer under Low Loading Conditions; 4.4.2 Exact Solution of Heat Transfer Equations; 4.4.2.1 Particle Heating without Evaporation; 4.4.2.2 Particle Heating with Evaporation; 4.4.2.3 Evaporation Time of a Particle4.4.3 Heat Transfer under Dense Loading ConditionsOver the past two decades, thermal spraying of metallic, ceramic and composite coatings has emerged as a powerful tool for surface engineering, with many new applications and markets continually being developed. This book will help materials scientists and engineers to choose the most appropriate combination of materials, equipment, and operation parameters for the design of high-performance coatings with new functional properties and improved service life.Includes:* a thorough treatment of the fundamental physical processes governing plasma spray technology;* a criticaPlasma sprayingCoatingsPlasma spraying.Coatings.621.044667.9Heimann R. B(Robert Bertram),1938-227835MiAaPQMiAaPQMiAaPQBOOK9910830982103321Plasma-spray coating3066652UNINA