5 Simple Techniques For Crystal
5 Simple Techniques For Crystal
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李商隐，杜牧，白居易，欧阳修，苏轼，呈大昌，辛弃疾，杨万里，吴文英，杨基，魏源等诗坛，词林大家都有歌吟水晶的佳篇传世。
①压电效�?在机械力(压力或拉�?作用下，水晶单晶体的两端会产生电荷，其电量相等但符号相反。在工业上，无色、无缺陷、不具双晶的水晶常被用来作压电石英片。
景观水晶，就是包裹体组成各种造型特异的水晶，有的似山水，有的似人物，有些像文字，有些像动物，植物，器物等等。
诗中道出一段唐代由盛变衰的史实。玄宗末年，杨贵妃得宠，三姐妹并封为国夫人。他们养尊处优，奢华至极，仆人用水晶盘将珍馐佳肴端到宴席上，美人觉得没有口味，懒得动筷子。作为“诗圣”作为“史诗”，紫驼一段写饮食之精美，不空发议论，只尽情揭露事实，无一刺讥语，无一慨叹声，却使人于以外得之：此诗之善讽也。以史为鉴，这样的世道，这样的人物，国家不出“安史之乱”那样的大祸反倒不正常了。
25If you are a Billy Crystal enthusiast, you can expect to really like this movie.如果你是比利·克里斯特尔的影迷，你就会喜欢这部电影。《柯林斯英汉双解大词典》
第二种是“半包裹体”，在水晶结晶以后，由于受到地球引力的影响而产生的裂隙，晶体外的一些物质通过水晶的裂隙渗透到水晶内部，一部分包裹于水晶之中另一部分露于水晶之外。我们可以看到物质渗进水晶的裂迹，常被称为“通道”，这种包裹体所形成的景象相对地较受自然环境和时间的影响，相应的价值也比较�?。
⑩、雷射内雕：以计算机辅助激光设备在水晶对象中进行三维图案的成型，艺术效果好，可以任意表达各类图案，图形，达到逼真效果
Crystals is usually grown less than reasonable situations from all 92 By natural means occurring factors besides helium, and helium is often crystallized at minimal temperatures by using twenty five atmospheres of tension.
Q.4. What is the distinction between atomic composition and crystal construction? Ans. The first distinction between atomic composition and crystal framework lies of their definitions: atomic framework refers to how atoms are arranged within a solitary molecule or simply a cluster of molecules, While crystal structure issues the particular arrangement of atoms in just a sound compound.
Solids which have short-variety get but lack extended-variety get are termed amorphous. Virtually any content could be built amorphous by fast solidification from your melt (molten state). This ailment is unstable, and also the solid will crystallize in time. In the event the timescale for crystallization is many years, then the amorphous point out seems stable.
Single crystals of metals are delicate and malleable, although polycrystalline metals are more challenging and stronger and are more valuable industrially. Most polycrystalline materials is usually built into significant solitary crystals soon after prolonged heat therapy. Previously blacksmiths would warmth a piece of metal to make it malleable: warmth would make a number of grains mature substantial by incorporating lesser ones. The smiths would bend the softened metallic into shape after which you can pound it awhile; the pounding would help it become polycrystalline once more, increasing its power.
正常的水晶在生长时，多可以发现和柱形尖端棱线平行的生长纹（growth traces）。由于在地底、岩洞中的生长空间多狭窄，尤其在遇到地震时，或地壳变动时，甚至容易遭到其他矿石的挤压，常常会压迫产生不同的「晶面」。还有，当水晶还是在液态状的时候，常常也会包覆着其他的矿石、泥灰一起结晶成长，如金红石（稍后变成发晶）、火山泥灰（稍后变成幻影水晶）等等。所有的这些，都是「自然的一部分」，请不要视为「瑕疵」。
This Evaluation chronicles in excess of twenty years of investigate into creating a genetic code for crystal engineering. Rather than directing biological processes, this code uses synthetic varieties of DNA to programme the assembly of nanoparticles and microparticles into 1D, 2D and 3D crystalline architectures, in which almost each and every facet of the resultant buildings may be systematically managed. In just this conceptual framework, the structural and purposeful advances are described in order to define the present degree of sophistication read more and to forecast long term Instructions of the System.
An additional type of crystalline carbon is based on the molecule with sixty carbon atoms called buckminsterfullerene (C60). The molecular form is spherical. Each and every carbon is bonded to 3 neighbours, as in graphite, along with the spherical condition is accomplished by a mix of twelve rings with five sides and 20 rings with 6 sides. Identical buildings had been first visualized from the American architect R. Buckminster Fuller for geodesic domes.