This article is dedicated to study of the jewelry craft of Staraya Ryazan’. It has been prepared for the 200th anniversary of the discovery of the first hoard there (1822), which marked the beginning ...of the study of ancient Russian towns, the most important area in the science of Russian antiquities. The marks of the individual style of a craftsman who served representatives of the princely family (interpretation of the images of animals, birds, anthropomorphic figures, and elements of ornamentation, as well as features of the technique) are considered. Jewelry made by him was found in four hoards (1950, 1966, 1970, and 2005). The hoard of 2013, in addition to jewelry, included raw materials and tools of the jeweler (bronze matrices). The number of the matrices indicates that they were intended for several workshops. Some data show that a large grand ducal jewelry workshop was located near the place of the find.
The size and shape of the mechanism working area are one of the most important criteria of its performance. Known approaches to the analysis of the workspace, such as the geometric method or the ...discretization method, have a number of features that limit their effective application. This paper considers the optimization chord method for determining the working areas of various types on the example of a planar parallel mechanism. The simulation results for maximum, constant orientation and dextrous workspaces are presented.
This paper discusses the mechanisms that ensure a constant point of entry of a tool into a working area. These devices were obtained using bevel gears or belt drives. The solution of the problem of ...the positions and velocities, as well as the problem of dynamic analysis, and the design of the operating model are presented.
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