Combining interesting explanations with 3-dimensional models to cut out and glue together, this book is an exploration of the symmetries of Escher's plane tilings. Some designs fold to make polyhedra and there is the delight in how the motifs fit together at the vertices and along the edges. Others make into kaleidocycles, models of linked tetrahedra which will turn thru their centers. As they are rotated Escher's interlocking patterns form and reform in endless procession. It is said that 'everyone loves surprizes' and this book is full of them
Combining interesting explanations with 3-dimensional models to cut out and glue together, this book is an exploration of the symmetries of Escher's plane tilings.
There has been considerable recent growth in the use of flexible pouch packaging for heat preserved foods, which has generated new opportunities for presentation of products ranging from meats, vegetables, and rice and pasta ready-foods to sauces, desserts and pet food. Such products can be ambient stable or chilled and include many of the socalled REPFEDs (refrigerated pasteurised foods of extended durability). These developments have created the need for up-to-date guidance on in-pack heat processing of such products, to encourage and enable the adoption of good manufacturing practice. This document provides this guidance Based on CCFRA's long established Guidelines on GMP for sterilisable flexible packaging operations for low acid foods (Technical Manual No. 4), this extensively revised and updated guide has been developed by a group of representatives actively involved in the manufacture and development of these types of products. It takes in packaging requirements (preformed, reel fed and secondary), filling techniques, sealing conditions, processing (both pasteurisation and sterilisation) and transportation. It also includes information on recommended quality assurance checks and on pouch defects. Written with a strong practical stance, the guide will be of use to both food and packaging companies using flexible sterilisable packaging for food and drink products.
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ekonomi ...