尖晶石、碧玺、黄玉、橄榄 石、锆石、石榴石、长石

一、前言 二、波的基本概念 三、平面简谐波方程 四、波动方程与波速 五、平均能流密度·声强与声压 六、波的叠加和千涉·驻波 七、多普勒效应

翡翠鉴赏概述 一、研究翡翠的意义; 二、翡翠是什么? 三、翡翠主要特征; 四、翡翠ABC货及赝品 五、翡翠的评价

INTRODUCTION TO STEREOGRAPHIC PROJECTIONS Basic principles Basic procedures Exercise in class

hinge lines axis A axial plane axial surface B (imaginary) Axis axial plane and axial surface

Classification of folds (continue) Based on four main features or properties: 1 direction of closing and facing 2 attitude of axial surface 3 size of inter-limb angle, and 4 shape of profile 5 dip isogons

hangingwall ramp A- Ramps and flats hangingwall B-Hangingwall ramp and footwall footwall ramp footwall ramp B C-? thrust sequence New thrusts develop in the footwall

Extensional Fault Systems A- Evolutionary model illustrating progressive extension accommodated by block rotation above a low-angle extensional fault. B-Listric fault with hangingwall rollover anticline. Area and B are equal. C-Flat/ramp geometry of fault produces geometrically necessary folding in hangingwall

hangingwall ramp A- Ramps and flats hangingwall B-Hangingwall ramp and footwall footwall ramp footwall ramp B C-? thrust sequence New thrusts develop in the footwall

1.地球的形状和大小 毕达哥拉斯(公元前540) 亚里士多德(公元前322) 东方与西方文化 人与神崇拜 炼丹化学 星象天文