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Tai-Chi Ch'Uan (Paperback): Y.K. Chen Tai-Chi Ch'Uan (Paperback)
Y.K. Chen
R320 Discovery Miles 3 200 Ships in 12 - 17 working days

Tai-chi Ch'uan is an ancient Chinese art based on the principles of physiology, psychology, and dynamics for the purpose of increasing and sustaining health. By practicing Tai-chi Chu'an, you can strengthen muscles, promote and regulate good blood circulation, refresh your whole body-and stimulate your spirit as well. Proper practice of the simple exercises clearly shown in this book can improve your digestion, adjust your weight up or down, clear your mind, allow you to think more clearly, and help you in dozens of ways you will find almost miraculous.

Tai-Chi Ch'Uan (Hardcover): Y.K. Chen Tai-Chi Ch'Uan (Hardcover)
Y.K. Chen
R463 Discovery Miles 4 630 Ships in 12 - 17 working days

Tai-chi Ch'uan is an ancient Chinese art based on the principles of physiology, psychology, and dynamics for the purpose of increasing and sustaining health. By practicing Tai-chi Chu'an, you can strengthen muscles, promote and regulate good blood circulation, refresh your whole body-and stimulate your spirit as well. Proper practice of the simple exercises clearly shown in this book can improve your digestion, adjust your weight up or down, clear your mind, allow you to think more clearly, and help you in dozens of ways you will find almost miraculous.

Graphite Ablation and Thermal Response Simulation Under ARC-Jet Flow Conditions (Paperback): Y.K. Chen Graphite Ablation and Thermal Response Simulation Under ARC-Jet Flow Conditions (Paperback)
Y.K. Chen
R387 Discovery Miles 3 870 Ships in 10 - 15 working days

The Two-dimensional Implicit Thermal Response and Ablation program, TITAN, was developed and integrated with a Navier-Stokes solver, GIANTS, for multidimensional ablation and shape change simulation of thermal protection systems in hypersonic flow environments. The governing equations in both codes are demoralized using the same finite-volume approximation with a general body-fitted coordinate system. Time-dependent solutions are achieved by an implicit time marching technique using Gauess-Siedel line relaxation with alternating sweeps. As the first part of a code validation study, this paper compares TITAN-GIANTS predictions with thermal response and recession data obtained from arc-jet tests recently conducted in the Interaction Heating Facility (IHF) at NASA Ames Research Center. The test models are graphite sphere-cones. Graphite was selected as a test material to minimize the uncertainties from material properties. Recession and thermal response data were obtained from two separate arc-jet test series. The first series was at a heat flux where graphite ablation is mainly due to sublimation, and the second series was at a relatively low heat flux where recession is the result of diffusion-controlled oxidation. Ablation and thermal response solutions for both sets of conditions, as calculated by TITAN-GIANTS, are presented and discussed in detail. Predicted shape change and temperature histories generally agree well with the data obtained from the arc-jet tests.

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