以影攻影——访香港摄影师陈汉全

对一名摄影师来说,相机的地位非同一般,既是形影不离的亲密伙伴,又是工作中的得力工具,我们在欣赏摄影师多彩纷呈作品的时候,往往不会注意相机这个默默无闻的角色.那么,如果相机变成拍摄对象,昔日低调的工具拭去尘土,站到聚光灯之下,又会是何种情形呢?我们专门请到帮尼康拍了4年多亚太区平面广告的香港摄影师陈汉全(Garry Chan),来听听一个摄影师"以影攻影"的经验之谈.     

水厂残余铝的影响因素试验研究

本文通过饮用水除铝的一系列生产实验，主要研究在处理流程中水温、pH值、过滤条件等因素对余铝的影响。提出残余铝随水温升高呈增加趋势。最佳pH值随水温的增加而降低。调整pH值可以调整溶解铝和颗粒铝的比例，从而改善残余铝的可去除率。过滤对除铝和除浊并不同步，应同时考虑除铝除浊确定过滤周期。在此基础上对水厂生产运行提出了一些建设。     

A STUDY OF AN ALUMINA-SILICA CHECKER BRICK FROM THE REGENERATOR OF A GLASS TANK *

At the end of a campaign, alumina-silica checker brick in glass-tank regenerators occasionally are found to have undergone partial destruction as a result of the separation of an altered surface layer of the brick from the less affected core. In an investigation of such an occurrence, it was found that the outer layer had largely been converted to nephelite by reaction of soda vapors and dust from the glass batch with mullite and corundum in the brick. Thermal expansion determinations showed that the rate of reversible thermal expansion in the altered layer was almost twice as great as that of the unaltered brick. It is concluded that the separation or slabbing of the altered layer was due in part to this difference in thermal expansion and in part to a permanent expansion of the slabbed layer which occurred apparently when portions of the brick substance were converted to nephelite.