Đang chuẩn bị liên kết để tải về tài liệu:
NONIMAGING OPTICS Roland Winston University of California

Gia Bảo 41 509 pdf

Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ Tải xuống

The earliest stone tools were crude, being little more than a fractured rock. In the Acheulian era, beginning approximately 1.65 million years ago, methods of working these stone into specific shapes, such as hand axes emerged. The Middle Paleolithic, approximately 300,000 years ago, saw the introduction of the prepared-core technique, where multiple blades could be rapidly formed from a single core stone.[23] The Upper Paleolithic, beginning approximately 40,000 years ago, saw the introduction of pressure flaking, where a wood, bone, or antler punch could be used to shape a stone very finely.[25]. | ELSEVIER ACADEMIC PRESS NON I MAGI NG o PT ICS ROLAND WINSTON JUAN C.MINANO PABLO BENITEZ With contributions by Norkis Shatz and John c. Bortz OPTICS AND PHOTONICS NONIMAGING .

TÀI LIỆU LIÊN QUAN