Forgery: 'fingerprinting' documents and packaging

We have found that almost all paper documents, plastic cards and product packaging contain a unique physical identity code formed from microscopic imperfections in the surface. This covert 'fingerprint' is intrinsic and virtually impossible to modify controllably. It can be rapidly read using a low-cost portable laser scanner. Most forms of document and branded-product fraud could be rendered obsolete by use of this code.     

Historical and other considerations regarding the crystal form of sodium-ammonium d- and l-tartrate,potassium d- and l-tartrate,potassium-ammonium d- and l-tartrate,and potassium racemate.—II

In 1914, the physics discipline had reached a very similar stage of development in Australia and Japan. A generation later the paths of development had considerably diverged. A systematic comparison of the evolution of physics in the two countries during these years identifies factors—political, economic and cultural—that led to this divergence, but it also uncovers a number of underlying parallels.     

数据通信与网络手册 卷2（第二版）

人们对信息传输速度的需求是无止境的，因此，也促进了数据通信和计算机网络的迅速发展，从而使人们的生活和工作也变得丰富和高效。本书是数据通信领域中的一本重要著作，囊括了现今数据通信及计算机网络相关领域中众多的概念和技术原理。此外，本书还列出了大量的常用网络缩略语，并对网络基础术语和最新概念进行了规范而权威的解释。读者通过查阅本书，可以透彻地理解这些术语的含义。     

1993 update, checklist of the vascular plants of Bryce Canyon National Park, Utah

An updated checklist of the vascular flora of Bryce Canyon National Park is presented, including 458 species arranged in 232 genera and 73 families. Four species have been added to the part list based on 1991 fieldwork: Arabis perennans , Arceuthobium divaricatum , Gentiana parryi , and Haplopappus acaulis . Recent changes in nomenclature have been included, and several species identifications have been corrected. The six largest families are, in decreasing size, Asteraceace, Pocaceae, Fabaceae, Brassicaceae, Scrophulariaceae, and Rosaceae. Common names and an index are provided.