查询词典 annularia

New data reveal that the age of the so-called Gigantopteris Coal Series indifferent places of South China is not exactly the same and ranges from the late LowerPermian to the close of the epoch,while several elements of the Gigantopteris-Flora,such as Gigantopteris,Pecopteris,Annularia,Lobatannularia and Paracalamites mays...

新的资料证实，这一含煤地层的时代在各地不尽相同，它起自早二叠世晚期——茅口期并一直延续至二叠纪末。对二叠纪古气候所作的概略分析表明，整个二叠纪在华南都是成煤期，只要古地理条件有利，在早二叠世的栖霞期和茅口期以及晚二叠世的龙潭期和长兴期都可以生成煤层。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。