维生素C与健康

维生素C(V_C,Vitamin C)与健康这是个说老也不老的话题。早在1740年,英国海军上将G·A·Anson带领6艘船和1955名海员做环球航行途中,许多船员患上了一种全身多处出血的怪病,并且感到周身疲倦、肌肉发呆、关节疼痛。由于找不到致病原因,无法控制疾病的发展,在1744年返航时1051名海员死于此病。百年之后,英国海军在Scott船长带领下作南极探险时也遇到了同样的麻烦,结果他和他的船员均死于相同的怪病。

An Integrated Tool for Power/Ground Network Design, Optimization,and Verification for Cell Based VLSIs

A CAD tool based on a group of efficient algorithms to verify,design,and optimize power/ground networks for standard cell model is presented.Nonlinear programming techniques,branch and bound algorithms and incomplete Cholesky decomposition conjugate gradient method (ICCG) are the three main parts of our work.Users can choose nonlinear programming method or branch and bound algorithm to satisfy their different requirements of precision and speed.The experimental results prove that the algorithms can run very fast with lower wiring resources consumption.As a result,the CAD tool based on these algorithms is able to cope with large-scale circuits.

暗示法

暗示法是一种教学法,它主张通过掘发人的潜意识来提高学习效果。暗示法形成于六十年代末、七十年代初,其创始人是保加利亚的医学博士、精神病疗法心理学家及教育学家乔基·罗扎诺夫。暗示法可用于各种学科的教学,但用在外语教学上,效果最佳。本文试以解释暗示法的教学原理,叙述其教学过程并提供一些教学试验的结果。