查询词典 Appleton layer

This invention discloses a new technology for preparing rear earth ionic doped fiber prefabricated rods with DC-RTA technology in a sol-gel method including preparing sol containing necessary doped ions, coating said sol uniformly on the inner wall of the quartz glass tube and burning it under high temperature to coagulate and vitrify them to a doped layer and repeating the above process to form a fiber prefabricated rod by oxygen and hydrogen flame after the doped layer reaches to a designed thickness and the fiber prefabricated rod can be made to various rare earth ionic doped fibers by an ordinary drawbench technology.

本发明属于光纤制造和光纤激光技术领域，具体公开了一种利用溶胶凝胶方法中的DC-RTA技术制备稀土离子掺杂光纤预制棒的新工艺。该工艺步骤包括预先配制好含有所需掺杂离子的溶胶，将该溶胶均匀涂覆在石英玻璃管的内壁后高温灼烧，使之凝结并玻璃化为一层掺杂层。反复上述涂覆灼烧过程，在掺杂层达到设计厚度后由氢氧焰高温收棒形成光纤预制棒。该方法所得到的光纤预制棒可以通过普通拉丝工艺拉制成各类稀土离子掺杂光纤。

In this paper we combining connecting tunnel project of Subway Line 4 at Xidan-lingjing bystreet in Beijing. To aim at the difficulties of building large-span connecting tunnels in the fine sand layer, through roads and underground pipelines, construction nearby buildings and other project difficulties. Using theoretical analysis, numerical simulation, field tests and other research methods to comprehensive and systemic research the stratum deformation mechanism and process control techniques of shallow excavation method, and a series of results were obtained. Firstly, use the stochastic media theory to analyze the stratum deformation mechanism, concretely analyze the analytic equation of surface horizontal displacement and deformation which were caused by the excavation of single-hole and double-hole tunnel, and further discussion on ground settlement, vertical deformation, surface horizontal displacement and horizontal deformation. Analyzing the main influence factors of surface displacement, and combined with practical work to proof the theory which was applied to shallow buried single-hole tunnel in fine sand layer was scientific.

本文结合北京地铁四号线西单～灵境胡同渡线隧道工程，针对在粉细砂地层中修建大跨渡线隧道，下穿道路和地下管线，临近建筑物施工等工程难点，利用理论分析、数值模拟、和现场监测等多种研究手段，对浅埋暗挖隧道地层变位机理及控制技术，深入地进行全面和系统的研究，并取得以下成果：(1)引入随机介质理论，对地层变位机理进行了分析，具体分析了单、双孔隧道开挖引起的地表位移及变形的解析方程，并深入探讨了地表沉降、垂直变形、地表水平位移和水平变形的特点，同时分析了影响地表位移的主要因素，并结合工程实例，佐证该理论应用于粉细砂地层浅埋暗挖单孔地铁隧道的科学性。

The geographical compositions of herbaceous plants of shrub-grass plot's soil seed bank indicate that genera of cosmopolitan have a heavy percentage, and indicate furthermore that the growth of herbaceous layer is affected significantly by human being's activities, and many calcifuge plants and indifferent plants in herbaceous layer reflect in certain extent that floristic element and ecological types are intricate.

各样地灌草坡种子库草本植物的地理成分表明世界分布属占较大比重，表明草本层的发育受人为活动的影响较为明显；且草本层中的厌钙植物和随遇植物也较多，从一个侧面反映了在人为活动的干扰影响下区系成分和生态类型的混杂。

The immunochemical study showed that CaLP may locate around the prisms and in the organic layer sandwiched between the prismatic layer and the nacre.

贝壳原位免疫实验显示，CaLP可能分布在贝壳棱柱层的棱柱周围以及棱柱层和珍珠层之间的有机夹层中。

The cased hole system is a cylindrical layer structure and the loading state of each layer is similar.

考虑到套管井系统是层状结构的特点，且各层受力情况具有相似性。

It is used as the waterproof layer of back lining layer in cataplasm and other transdermal preparation.

可用作巴布剂或其他透皮制剂背衬层的防水涂层。

Cellulitis is a bacterial infection of the deep layer of skin and the layer of fat and soft tissues that lie underneath the skin.

蜂窝组织炎是一种细菌感染的深层皮肤和层脂肪和软组织的谎言下的皮肤。

The ceramal layer on the surface of mild steel was cladded by using a double-layer precoating method.

采用双层预涂覆方法在低碳钢表面激光熔覆金属陶瓷涂层。

Gradually, the home of the kitchen stove, cold and cheerless on a layer after layer of the earth.

渐渐地，厨房的火炉，在寒冷和307层的地层后回家。

Acid rain the ozone layer 空气污染 acidic pollution ozone air pollution causes of acid rain chemical products trees SO2 O2 HCl condition of the ozone layer effects of acid rain acidic rain àHow measure acids atmosphere

空气污染(学科：化学年级：高中三年级)执教者：市北中学徐云蕾 1、空气污染已经成为人们关注的话题，本节课主要讨论空气污染的两个方面：酸雨和臭氧层空洞。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。