1994年金属矿物（锌,铅,锡）年评

锌1993年锌面临着非常艰巨的形势，这种形势1994年仍将维持。在原市场经济国家（EMEC），锌消耗增加1．8％达到5．48Mt记录，基本与这些国家的金属产出平衡（5．47Mt）。这可能预示着一个良好的状况，但由于大量来自东方国家的进口引起大约500，000t锌的过剩，导致实际储存的增加，迫使价格下跌。该年一些矿山关闭，矿产量减少400，000t（大约7％），预计1994年矿产量将进一步减少150，000t，同时，前些年的实际精矿储存量也将下降。这些对将来的生产一定会起到限制作用，但1993年底的金属库存仍处于1．44Mt水平。虽然预计来自东方国家的…     

激光多普勒测速仪在弯管中的折射修正

介绍2种在应用双光束激光多普勒测速仪测量弯管内流速时，修正测量体位置和光束之间夹角的计算方法。一种是Snell折射定律的简化近似法，而另一种是精确的光线追踪法。针对弯管实例，将这2种方法所得的结果相比较，可看出近似法的不足是对三维折射的修正不够充分，然而与在直管中折射效应的测量结果相比较，证明这2种修正方法均是可行的。     

安斯沃思湖体育娱乐厅

澳大利亚政府的旅游、体育和娱乐部门要求建造一个多功能娱乐厅，可以用来进行篮球、网球、羽毛球、排球等综合娱乐以及演出。这对于AJ C来说是一个挑战因为该项设计既要吸引用户．又要适合用地的情况．具有环境效益．节省能源，还不能超过拮据的预算。     

苹果公司总部

苹果公司澳大利亚总部办公楼占地2ha，位于悉尼中央商务中心13km以北的一个办公园区里，该建筑修建在一座小山上，因此向北面，南面和东面望去，都能享受得天独厚的美景。     

The interaction of chromostereopsis and stereopsis in stereoscopic CRT displays

To give operators of high-speed, highly-manoeuvrable vehicles the ability to keep pace with their increasingly dynamic environment, stereoscopic 3-D displays may soon replace conventional 2-D displays. Important to the development of stereoscopic 3-D displays is the interaction of perceived depth created by hues (chromostereopsis) and perceived depth created by presenting different images of a single object to the left and right eye of the observer (stereopsis). The purpose of this research is to evaluate the interaction of chromostereopsis and stereopsis on a stereoscopic CRT by determining the level of accuracy with which subjects can properly interpret the relative depth differences of adjacent symbols containing six levels of hue and seven levels of stereoscopic disparity. This research demonstrated that hue, disparity, and the interaction of hue and disparity significantly influenced one's perception of depth on a stereoscopic monitor. The results suggest that caution should be exercised by the stereoscopic 3-D display format designer when choosing hues to represent images located in close proximity on a stereoscopic display. Due to the chromostereoscopic effect on the perception of depth, hues on extreme ends of the colour spectrum should not be used in situations where less than 3.39 arc minutes of disparity difference is being portrayed on a stereoscopic display, unless the hues are consistently being used to alter the depth presented by stereoscopic disparity, or the chromostereoscopic depth resulting from certain hues is consistently nullified by altering disparity levels accordingly.     

The effect of acoustic diffraction and acoustic attenuation on the dynamic range of acoustooptic Bragg cells

A three-dimensional model for the propagation of finite acoustic waves in nonlinear media is developed. This model implicitly includes the effects of acoustic attenuation and divergence due to diffraction. The generation of intermodulation products in the case of a two-tone input signal is numerically analyzed. It is found that acoustic diffraction can have a significant effect on the dynamic range of a Bragg cell if the acoustic field extends well into the Fraunhofer region. Inclusion of the effect of diffraction in the model predicts a dynamic range that can be considerably larger than the value obtained by using the infinite plane wave assumption. It is shown that acoustic attenuation significantly reduces the level of the acoustic intermodulation products relative to the level of the fundamental modes. This also increases the dynamic range. The influence of these effects on design considerations for Bragg cells is discussed.