structure designed by elastic method of analysis
51List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
52Reinforced concrete — is concrete in which reinforcement bars ( rebars ), reinforcement grids, plates or fibers have been incorporated to strengthen the concrete in tension. It was invented by French gardener Joseph Monier in 1849 and patented in 1867.[1] The term… …
53rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
54Crystal (software) — For other uses, see Crystal (disambiguation). CRYSTAL is a quantum chemistry ab initio program, designed primarily for calculations on crystals (3 dimensions), slabs (2 dimensions) and polymers (1 dimension) using translational symmetry, but it… …
55Protein — Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residues. The sequence of amino acids in a protein is defined by …
56Comte and positivism — Robert Brown COMTE’S AIMS The chief aim of all of Auguste Comte’s publications, and the constant mission of his entire working life, was the improvement of human character through the perfecting of human society. He was convinced that the… …
57Nerve guidance conduit — A nerve guidance conduit (also referred to as an artificial nerve conduit or artificial nerve graft, as opposed to an autograft) is an artificial means of guiding axonal regrowth to facilitate nerve regeneration and is one of several clinical… …
58Friction — For other uses, see Friction (disambiguation). Classical mechanics …
59Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …
60Bicycle frame — Steel frame of 2000 LeMond Zurich road racing bicycle mounted in a work stand …
