Quantum Electronics

Active optical clock

Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, has proposed the concept, principles and techniques of active optical clock. The study is reported in Issue 54 (February, 2009) of Chinese Science Bulletin because of its significant research value.

New organic material may speed Internet access

The next time an overnight snow begins to fall, take two bricks and place them side by side a few inches apart in your yard.

In the morning, the bricks will be covered with snow and barely discernible. The snowflakes will have filled every vacant space between and around the bricks.