橄榄石

The results showed that:①the crystalline phases are mainly the cuspidine, wollastonite and gehlenite with nepheline, fluorite and olivine also found in some samples under the experimental conditions;②with the bacisity and CaF_2 content increased, crystalline proportion of mold flux rises .

熔融保护渣在MoSi2高温电阻炉内以2℃/min降温速率冷却至室温，制成薄片，采用岩相显微镜分析保护渣的结晶矿相·结果表明：在本实验条件下，结晶矿相主要有枪晶石，硅灰石，黄长石，个别渣样有霞石，萤石，橄榄石；增大保护渣碱度，能促进保护渣结晶；随着渣中CaF2，Na2O，K2O和Li2O质量分数的增大，保护渣结晶化率增大；随着渣中Al2O3，MgO，BaO和MnO质量分数的增大，保护渣结晶化率减小

In the condition of keeping F、 K、Na content fixed, To improve slag structure and raise slag melting point and viscosity, MgO content is raised and TiO〓 is added. the main content is as follows:(1) Keeping CaO/SiO〓 fixed, MgO content rises from 10% to 16%, the free running temperature goes up 106℃, the viscosity goe down at bigger than 1425℃, but difference is little; keeping /SiO〓 fixed, MgO content rises from 10% to 16%, the free running temperature rises 87℃, the viscosity rises too; adding TiO〓 to 5%, the free running temperature goes up 98℃, the viscosity rise a little.(2) Powder crystal x ray diffraction and microscopic analysis shows: increasing MgO content, the cuspidine will decreace or even disappear, the monticellite goes up with MgO content rising, keeping /SiO〓 fixed, Akermanite content goes up, for high melting point minerals appear or go up, the free running temperature of the slag bearing F is raised; Adding TiO〓, high melting point mineral—Perovskite forms, it can making other minerals'crystalling fast, it is the reason that TiO〓 raises the free running temperature of the slag bearing F.

2对测定粘度的冷凝渣所进行的X粉晶衍射及显微分析和鉴定表明，增加MgO含量，渣中枪晶石将减少甚至消失，而钙镁橄榄石则随MgO含量增加而增加，在／SiO〓不变时，黄长石含量也有所增加，高熔点矿物的出现和增加，提高了含氟熔渣的熔化性温度；加入TiO〓熔渣中将形成高熔点矿物-钙钛矿，钙钛矿的形成还促使黄长石的结晶，这是TiO〓提高含氟熔渣熔化性温度的根本原因。

As they cool off,they transform into forsterite, a type of silicate crystal often found in comets in our solar system.

当它们再次冷却时，就形成了以MgSiO3为主体的橄榄石，一种我们太阳系的彗星中常能发现的晶体。

ABSTRACT Color center and chromium－doped forsterite lasers were studied theoretically and experimentally in the dissertation.

本文主要对色心及掺铬镁橄榄石激光器的理论和实验进行了研究。

The study results of band structure and density of state indicate that band gaps and insulativity of a andβphases forsterite increase with increasing pressure.

带结构和态密度研究表明随着压力的增加，α和β镁橄榄石带隙增加，绝缘性增强。

Adding water in the forsterite crystal reduces the bag gap of the crystal.

水减小了镁橄榄石带隙。

The results show that magnetite is transformed into hematite, serpentine is decomposed into forsterite at lower temperature(T00℃).

实验表明，硼铁矿在氧化焙烧的过程中，低温时(00℃)矿石中的磁铁矿发生氧化反应生成亦铁矿，蛇纹石分解生成镁橄榄石。

ABSTRACT One of the new laser crystals drawing much attention in recent years is the synthetic chromium-doped forsterite, for which Cr ions...

人工掺铬镁橄榄石晶体是近年来受到重视的一种激光晶体，它能使铬离子实现新波段的激光运转。

M and 1. 12 ～1. 26μm, respectively. An equipment has been designed to make the three lasers operate. The equipment can be used in titanium sapphire and chromium－doped forsterite lasers for tuning over a larger range.

并设计了一个能利用同一装置方便地实现三种激光器的调谐运转；这一装置可以类似地应用于钛宝石激光器和掺铬镁橄榄石激光器中，实现范围更宽的可调谐激光输出。

In this thesis, we demonstrate that elastin is one of major origins of the THG contrast under Cr:forsterite laser excitation operating at 1230nm, with selective visualization inside many tissues such as lung tissues and arteries.

在这篇论文中，在使用中心波长为1230nm的铬贵橄榄石雷射光源激发之下，证实了弹性蛋白是三倍频的主要来源之ㄧ，且在许多生物体中如肺组织和血管中有著选择性的影像。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。