立方

The dichroic beam-splitting mirror of cubic prism is an important element to realize multispectrum in one channel.

立方棱镜二向色分光镜是实现多光谱共光路的重要器件。

In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8～1.6ns is 332～470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.

计算结果表明：在片层结构的石墨晶体中，正电子主要在石墨层间的空隙中湮没，计算出的石墨中的正电子寿命为208 pS，与文献中的实验结果215 ps符合很好；在金刚石单晶中，正电子主要在碳原子之间的空隙中存在并发生湮没，计算出的金刚石中的正电子寿命为115 ps，文献中的实验结果110 ps左右符合；在面心立方结构的C60晶体中，正电子主要在C60分子球壳内外侧及分子之间存在，C60球形分子中心正电子分布很少，正电子的湮没区域集中在C60分子之间的空隙区域，计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合；对于不同管径碳米管束中的正电子分布，随着碳纳米管直径的增加，碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现：碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大，与核心电子的湮没概率变得越来越小；碳纳米管束中正电子的湮没寿命先迅速增大，而后趋于一定值。

Chapter 4: Influence of the angle distortion induced from rhombohedral La_(0.7)Sr_(0.3)MnO_3 grown on the cubic substrates on the structure and transport properties of CMR thin films is carefully studied.

第四章研究菱形结构的La_(0.7)Sr_(0.3)MnO_3生长在立方衬底上引起的角度畸变对薄膜的微结构和电磁性质的影响。

If is the smallest cubic number divisible by 810, find the value of .

如果是可被810整除的最小立方数，求的值。

Scanning electron microscopy observed that the mesoporous silica single crystal had a regular rhombic dodecahedron morphology with a uniform particle size of 5 μm.

扫描电子显微镜观察到这种介孔二氧化硅单晶具有菱形十二面体形貌， X射线衍射和透射电子显微镜测试结果证实这种介孔单晶属于简单立方Pm3n对称结构。

During the drill stem test, the well showed a flow at an average rate of 560 barrels of oil per day and approximately 32000 cubic feet of gas per day.

在钻杆测试中，该井可日产原油560多桶，天然气约3.2万立方英尺。

A United States dry measure equal to 8 quarts or 537.605 cubic inches.

美国干量单位等于夸脱或立方英寸。

A United States dry measure equal to 4 pecks or 2152.42 cubic inches.

美国干量单位等于配克立方英寸。

Able to tote two golf bags and a small duffel with the top up, that space shrinks to just 2.36 cubic feet with the top down.

能够携带两个高尔夫球袋和一个小一种粗呢的顶端了，空间缩小到二点三六立方英尺与自上而下。

By using hexagonal mesostructured template, metal Cu nanowires with diameter of 7 nm were derived and by using body-centered mesostructured template, Cu nanoparticles with dumbbell-like morphology were obtained.

以六方孔道结构的介孔氧化硅模板获得了直径为 7nm的金属铜纳米线阵列；以笼状体心立方孔道结构的模板获得了具有哑铃状形貌的铜单质纳米颗粒。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。