The meaning of ALPHA QUARTZ is quartz with trigonal-trapezohedral symmetry : the stable form of quartz below about 573° C.
(2009). quartz, alpha. In: Manutchehr-Danai, M. (eds) Dictionary of Gems and Gemology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72816-0_17812 Download citation .RIS .ENW .BIB DOIhttps://doi.org/10.1007/978-3-540-72816-0_17812 Publisher NameSpringer, Berlin,...
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我们可以为所有接受颜色的程序指定一个alpha值作为颜色值的最后一个组件。同样也可以使用CGContextSetAlpha函数来指定全局的alpha值。记住,如果同时设置以上两个值,Quartz将混合全局alpha值与对象的alpha值。 为了让page完全透明,我们可以调用CGContextClearRect函数来清除图形上下文(graphics context)的alpha通道。例如,我们可以...
Alpha quartzM.M.J. TreacyJ.B. HigginsCollection of Simulated XRD Powder Patterns for Zeolites (Fifth Edition)
每个颜色的颜色组件的数目取决于颜色空间。对于离屏绘制,我们使用一个RGB颜色空间。因为Quartz使用alpha来绘制,每个离屏颜色都有四个组件—红、绿、蓝和alpha。所以,对于离屏绘制,我们提供的颜色组件数组的元素的数目必须是位置数目的4倍。Quartz的RGBA颜色组件可以在0.0到1.0之间改变。
This chapter presents the numerical data and the simulated powder patterns of Alpha Quartz material with 39.49° as 2θ value. Two compositions, which are expressed in terms of the full unit cell content, are provided. The chemical composition is the nominal material composition provided in the ...
Crystal chemistry of alpha-quartz is discussed in relation to the nature, concentration and distribution of the common impurities. Two schemes for incorporation of impurities in the host structure, viz. , the charge compensation model for untwinned natural quartz, and the broken-bond model for ...
您可以通过调用函数CGColorCreate来创建CGColor对象,传递CGColorspace对象和一个指定颜色强度值的浮点值数组。数组中的最后一个组件指定了alpha值。 Setting Rendering Intent - 设置渲染意图 渲染意图指定Quartz如何将颜色从源颜色空间映射到图形上下文的目标颜色空间的色域内的颜色。如果未明确设置渲染意图,Quartz会对除位...
The history of the use of alpha quartz, SiO/sub 2/, one of the nine forms of silica is sketched, and its structure and crystallography are described. Piezoelectricity, the most important property of quartz from an electrical standpoint, is explained. Processing of quartz crystals to ensure prop...