New PDF release: A History of Engineering in Classical and Medieval Times

By Donald R. Hill

ISBN-10: 131776157X

ISBN-13: 9781317761570

During this complete historical past, Donald Hill opens a window on medieval and classical engineering. The ebook specializes in on Greece, Rome and medieval Western Europe, but in addition comprises fascinating info on heart japanese technology.

Documenting over 1800 years, Donald Hill illustrates how classical and medieval engineers designed early irrigation structures, dams, bridges, clocks and the way they harnessed the facility of either water and wind. operating mostly with out a quantified, medical foundation for his or her designs, those early engineers studied the homes of fabrics and how during which fluids and solids behaved in sure stipulations. They then utilized this information to successfully remedy difficulties. This interesting learn files over 1800 years of early engineering.

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57) for finding a unique solution of such class problems of mechanics. 00722 . 3779λ1 . 3); the Poisson ratio ν (λ ) is the ratio of lateral deformation ε ⊥ to longitudinal ε  ; ε 0 is the change of the length of the sample because of only swelling effect. 63) we will have: ε = ε 0 (λ ) = αλ . 4). 64) will correspond to the case of fastened sample at fixed ends and boundedness of its longitudinal deformation. 5 Dependence of elasticity modulus polymer material. E (λ ) on the swelling parameter l of Under the action of only corrosive medium, in the sample there will arise thrust stress of size σ = − E (λ )ε 0 (λ ) .

46) The obtained result certifies on very negligible water absorption of a polypropylene and its well water-resistance. Bounds of applicability of exact analytic solutions. The characteristics of water absorption and chemical resistance are defined on samples whose sizes are regulated by appropriate standards that define the form of the samples, test conditions, their duration. In some cases, while conducting tests, for providing one dimensionality of diffusion flux, the end face or lateral surfaces of samples are hydro-isolated.

5 on a specific example we will numerically show quality and quantity influence of corrosive liquid medium, that is, influence of thrust forces on the character of defining relations. 4, write the models of deformation of polymer material of the brand PS with regard to and regardless of the influence of corrosive liquid medium, that is, thrust forces for λ = 0 and λ = 1 . 94) we can note the followings: • The coefficient a(λ ) λ =1 corresponding to the case of influence of corrosive liquid medium, that is, the case of influence of swelling of polymer material is higher by 25% than the coefficient a0 λ =0 that Interaction of Physico–Mechanical and Physico–Chemical Properties 47 corresponds to the case of regardless of the influence of corrosive liquid medium, that is, the case when there is no influence of swelling of polymer material.

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A History of Engineering in Classical and Medieval Times by Donald R. Hill

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