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Search Results: 1 - 10 of 582085 matches for " A.D. Kahlen "
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A.D. Kahlen
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: Opportunities to improve production processes and access to markets through the implementation of lean manufacturing in biomedical manufacturing are presented. The importance of a unified definition of manufacturing, to which biomedical manufacturing is party, is emphasized, and the theory of “lean”, summarized as “purpose, process, people”, is elaborated. The requirements for the creation of value through the creation of flow and the elimination of wastes are highlighted in the context of biomedical manufacturing. Finally, case studies are presented to illustrate the approaches to “purpose, process, people”. AFRIKAANSE OPSOMMING: Geleenthede vir die verbetering van produksieprosesse en marktoegang via die implementering van skraalvervaardiging in die biomediese vervaardigingsbedryf word voorgehou. Aandag word geskenk aan die betekenis van terme soos “skraal, doel, proses, menes” in die konteks van biomediese vervaardiging. Waardeskepping, vloei en vermorsing word onder die loep geneem. Gevallestudies word ter illustrasie van begrippe aangebied.
An Analysis of Jigbe as a Traditional Dramatic Performance
A.D. Menegbe
Pakistan Journal of Social Sciences , 2012, DOI: 10.3923/pjssci.2011.27.31
Abstract: Discussions have been on for along time over the issue of the existence of drama in traditional African society. Two schools of thought have crystallized. The evolutionist school maintains that there is nothing in traditional African society to be classified as drama. The relativist school postulates that drama strives abundantly in traditional African society. This study attempts an analysis of jigbe traditional drama as one of the many traditional dramatic performance in African it is observed that it could serve as one of the various source materials for modern African drama we recommend that it should be documented for the purpose of preserving it present form. We further suggest the performance be patronized for its survival.
The time of groundwater free surface lowering before foundation pit construction
A.D. Girgidov
Magazine of Civil Engineering , 2012,
Abstract: On the basis of plane free surface gravitations groundwater flow model and some assumptions similar to ones employing in infiltration and quasistationary problems the time of the necessary lowering of free surface before the building of pit is considered. For the lowering the group of wells along the pit perimeter is used. The wells are located so close to each other that formation a filtration flow by them is equivalent to dewatering by using a narrow vertical slit along the perimeter of the excavation.The time is calculated on the basis of condition that at the beginning of construction the level of ground water within the excavation must be below the design elevation of excavation bottom, and outside it smoothly changing water flow to the slit must be formed.The formulas for the time of lowering from initial natural level before building of pit to finite level equal to the bottom of pit are obtained. The example of calculation is discussed.
Energy dissipation in circular tube
A.D. Girgidov
Magazine of Civil Engineering , 2012,
Abstract: Energy dissipation distribution along the circular tube radius is important in solving such problems as calculation of heat transfer by the air flow through building envelope; calculation of pressure loss in spiral flows; calculation of cyclones with axial and tangential supply of dust-containing gas.Two types of one-dimensional radially axisymmetric flows in circular tube were considered: axial flow and rotation about the axis (Rankine vortex). Relying on two- and four-layer description of axial turbulent flow energy dissipation was calculated in each layer.Similar calculation for Rankine vortex with viscous sublayer at the tube surface was provided. By employing the dissipation minimum principle the boundary radius between rigid rotation and free vortex is calculated. Approximation of the velocity distribution in Rankine vortex is proposed.
Changing of energy dissipation in the transition of laminar flow to turbulence (rus)
Girgidov A.D.
Magazine of Civil Engineering , 2011,
Abstract: Under the same fixed dynamical boundary conditions the energy dissipation in laminar and turbulent flow are compared. As examples the flow past a plate and the flow through a pipe are considered. It is found out that in turbulent flow energy dissipation is essentially less than in laminar flow (under the same boundary dynamical conditions).
About the frontal resistance to motion of the cylinder
A.D. Girgidov
Magazine of Civil Engineering , 2011,
Abstract: According to conventional diagram of the flow past cylinder, dissipated power in the part of potential flow, formed by windward side of cylinder is calculated. Comparison of this power with the power, required to overcome the resistance to motion of the cylinder, shows that thin boundary layer in windward side of cylinder forms under Reynolds numbers exceeded 100.
Chironomids: From Genes to Ecosystems/Edited by Peter Cranston
A.D. Harrison
African Zoology , 2011,
Abstract: This book comprises 46 papers delivered at the 12th International Chironomid Symposium in Canberra, Australia, January 1994. Delegates attended from all continents, except Africa, and their papers give an excellent idea of the research being carried out on this important group of aquatic insects.
Sea fishes spawning pelagic eggs in the St Lucia estuary
A.D. Connell
African Zoology , 2011,
Abstract: During September 1993, after the St Lucia estuary had been dosed to the sea for about nine months, two samples of live plankton were collected at the mouth inside the closed estuary. Fish eggs from these samples were hatched and identified by the characteristics of the eggs and early larvae. Pomadasys commersonnii and Crenidens crenidens were reared to confirm identification. Eggs of nine species were found and all but one were identified to at least genus level. The unidentified egg was probably that of a dupeiform, and the most common egg was the spotted grunter Pomadasys commersonnii. Subsequent sampling in the Charters Creek area in 1994 confirmed that five of the species also spawn in the main lake, while a further species was added to the list of marine fishes that will spawn in St Lucia given favourable conditions.
Pelagic eggs of marine fishes from Park Rynie, KwaZulu-Natal, South Africa: seasonal spawningpatterns of the three most common species
A.D. Connell
African Zoology , 2011,
Abstract: For the period 1987 to 1998, pelagic eggs of marine fishes were collected from shelf waters at Park Rynie on the KwaZulu-Natal south coast. The three most numerous eggs collected were those of the mackerel Scomber japonicus, the sardine Sardinops sagax and the East coast roundherring Etrumeus teres. Together they comprised 67 % of all eggs collected. At times single-species egg densities were high, the highest accurately recorded was 850 eggs/cubic metre for S. sagax. All three species were predominantly winter to spring spawners. The seasonal pattern of sardine eggs at Park Rynie suggests that after entering KwaZulu-Natal waters in June, sardines remain until November or December of each year before returning south to eastern Cape waters. Spawning in the East coast roundherring began in June, peaked in October to November, and tailed off in January. The mackerel showed a similar pattern of spawning, beginning in June and ending in December
Synthesis and structure of intercalated organo-inorganic nanocomposites
Pomogailo A.D.
Proceedings of the International Conference Nanomaterials : Applications and Properties , 2012,
Abstract: The synthesis and structure of organo–inorganic nanocomposites prepared by intercalation of monomers or polymers into the interlayer galleries of layered matrices are analyzed. General features and the mechanism of the intercalation process, as well as materials used for this purpose, mostly often naturally occurring materials (clays, silicates, layered phosphates, chalcogenides, and other moieties hosts), are discussed. Mechanisms governing the intercalation of monomers or polymer repeating units into the interlayer galleries as guests are compared. One of the most widespread and commercially important intracrystalline chemical reactions is the incorporation of monomer molecules into pores or layered lattices of the host substances with subsequent post-intercalation transformations into polymer, oligomer, or hybrid–sandwich products. Particular emphasis is placed on nanocomposites based on epoxy polymers and various mineral matrices. Basic application areas of hybrid nanomaterials are considered. Keywords: Nanocomposites, Intercalation, Epoxy resins, Metal nanoparticles, Hybrid nanomaterials, Clays, Polymerization
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