Peerage of England Genealogical, Biographical, and Historical. Greatly Augmented and Continued to the Present Time Volume 5
- Livres de poche1999, ISBN: 9781234348762
The Mathematical Association of America, 1999-04-01. Paperback. New. Brand new. We distribute directly for the publisher. The peoples of Africa south of the Sahara desert constitute a … Plus…
The Mathematical Association of America, 1999-04-01. Paperback. New. Brand new. We distribute directly for the publisher. The peoples of Africa south of the Sahara desert constitute a vibrant cultural mosaic, extremely rich in its diversity. Among the peoples of the sub-Saharan region, interest in creating and exploring forms and shapes has blossomed in diverse cultural and social contexts with such an intensity that with reason, to paraphrase Claudia Zaslavsky's Africa Counts, it may be said that "Africa Geometrizes" as well. Paulus Gerdes demonstrates the influence of geometrical ideas on African Culture with dozens of stories and beautiful illustrations.In his first section, Gerdes presents examples of geometrical ideas in the work of wood and ivory carvers, potters, painters, weavers, and mat and basket makers. In the next section he uses examples from Senegal and Madagascar to illustrate how diverse African ornaments and artifacts may be used to lead students to discover the Pythagorean Theorem and to find proofs of it. Paulus also explores connections to Pappus' Theorem, similar right triangles, Latin and magic squares, and arithmetic modulon.In the third section of this book, Paulus analyzes geometrical ideas inherent in various crafts and explores possibilities for their educational use. Topics include symmetrical wall decorations in Lesotho and South Africa, house building in Mozambique, and Liberia and finite geometrical designs from the Lower Congo region.The theme of the fourth section of this book is the geometry of the south-central African sand drawing traditionthe drawings are called sona in the Chokwe language (predominately northeast Angola). As slavery and colonial domination disrupted and destroyed so many African traditions, the sona tradition with its strong geometrical component virtually disappeared. Paulus explains this traditional method by which folklore was passed from generation to generation via beautiful, often symmetric, designs made in the sand and he offers many suggestions by which the reader will find mathematical ideas imbedded in their work., The Mathematical Association of America, 1999-04-01, RareBooksClub.com. Paperback. New. This item is printed on demand. Paperback. 178 pages. Dimensions: 9.7in. x 7.4in. x 0.4in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: . . . before the inches and fractions are converted to decimals of a foot. The weights should be placed in the spaces provided for them; fine vertical lines are printed on the forms to simplify the alignment of figures for totaling. When all members of a group weigh the same, a line can be drawn under the weight of the last component part and a single total can be recorded in the blank space between groups, as for F 9. When the weights of the members of a group differ, each must have its own total; to save space each total may be recorded opposite the mark of the proper member, as for F 7 and F 8 or for S 4, S 5 and S 6. Care must be taken to include in these totals only the weights of the component parts which form the corresponding members, allowing for material cut away. The difference between the weight of the heads of shop rivets and the weight of material punched out for open holes should be entered upon the shop hill with the proper sign. In counting rivets and holes special attention should be given to symmetrical notes, and to group spacing; each rivet has two heads. The weights of rivets and bolts are given on page 304. The weight of a bolt or a rivet may be obtained by the proper combination of the weights of the head, the nut, and the shank of proper length. The weights of standard connection angles for beams given on pages 298-301 include the weights of the shop rivet heads. 1. A shipping bill is a summary of members in the form in which they are to be shipped. It is made primarily as a check list for the shipper. All members which bear the same shipping mark should be billed on the same line, but different marks should be listed separately. In each case the number, the name, the mark, and the shipping dimensions should be given; the weight is given . . . This item ships from La Vergne,TN., RareBooksClub.com, Rarebooksclub.com. Paperback. New. This item is printed on demand. Paperback. 56 pages. Original publisher: Hampton, Va. : National Aeronautics and Space Administration, Langley Research Center, 1990 OCLC Number: (OCoLC)65221811 Excerpt: . . . of the wake. At the boundary layer edges, above and below the airfoil, the streamwise velocity is specified as the boundary condition. On the wing surface no slip is specified, i. e. zero velocity. For three-dimensional flows, the spanwise edge velocity conditions are also specified similarly to the streawise conditions at the boundary layer edge. Different forms of boundary conditions are specified for the continuity equation. Since the continuity equation is discretized as a two point trapezoidal integral form, no boundary conditions as such are specified at the boundary layer edge but rather, the governing equation is solved there. However, at the centerline an additional condition is required. Since the velocity is not known there, a priori, it obviously cannot be specified. Instead, a smoothness condition is enforced, i. e. , the second derivative of the normal velocity is set to zero. Note that for the momentum equation the governing equation itself is solved at the centerline. Once the two sweeps are completed the velocity components are transformed into their physical normal to the wall and streamwise components. Two-Dimensional Steady Turbulent Flow for NACA 0012 Airfoil The case performed is the turbulent flow over a NACA 0012, symmetric airfoil o at a 4. 86 angle of attack. The freestream chord Reynolds number was. 48E 07 and the mean freestream Math number 0. 599. The freestream temperature was assumed O to be 300 K. The computational domain was chosen with inflow boundary located at x . i ft (. i chord ) and the outflow boundary located at x 4. 6 ft, while the outer edge was set to a constant value of. 25 ft in the direction normal to airfoil surface for all x ( the airfoil leading edge corresponds to x 0 and trailing edge corresponds to x I ). The grid distribution in the normal direction . . . This item ships from La Vergne,TN., Rarebooksclub.com<