查询词典 electron tube

The top of neural tube forms basic encenphalic shape,namely endbrain, interbrain, midbrain and afterbrain. The abnormal closure of neural tube will result in neural tube detects. Encephalocoele is a common congenital malformation whose mechanism was no known. NO participates in the physiologic process of brain.

胚胎脑发育的早期阶段主要是神经板隆起、弯曲、闭合形成神经管，神经管的头部从前向后依次发育形成脑的基本组织形态，即端脑、间脑、中脑、后脑，在神经管闭合过程中出现异常就会导致NTD。

A mechanic model of a thin tube p asted with an actuator, is presented, the mixed deformations of compr ession and torsion of the tube are analyzed and the relation between the angle o f twist of the tube and temperature in a temperature cycle is given.

建立了粘有SMA丝应变驱动器的薄壁圆管的力学模型，分析了一个温度循环中，薄壁圆管受SMA驱动发生的压扭复合变形，给出了薄壁圆管扭转角与激励温度之间的关系。

Qingdao pipeline expert specialized hot line; 13012952726 provide the pipelining service; After installment service replacement hot and cold pipeline, place bedpan, the water tank, the hand wash basin, the water heater, the galvanized pipe, the aluminum model the tube, the pvc tube, the pp-R multiple-unit tube, the hot air pipe, the valve, the water cock, the inside and outside wall leakage, the machinery opening sewer, to replace the floor drain

青岛管道专家专业热线电话；13012952726提供管道安装维修；安装维修更换冷热水管道、座便器、后水箱、洗手盆、热水器、镀锌管、铝塑管、pvc管、pp-R复合管、暖气管、阀门、水龙头、内外墙渗漏、机械疏通下水、更换地漏、另外我们有节水型、直排式、虹吸式座便器全部按出厂价自销、五金配件保修五年。

The results showed that: different concentrations of sucrose and boric acid had significant impact on pollen germination, but different concentrations of calcium had no significant impact on pollen germination. It was most appropriate for tube elongation when sugar 150 gL^(-1) and boric acid 100 gL^(-1). Lack of sucrose would lead to the accumulation of callose in top of pollen tube and hold back its growth. The distribution of callose was regular in pollen tube when the medium lacked boric.

结果表明：蔗糖、硼酸浓度间对花粉萌发有显著影响，钙浓度间对花粉萌发的促进作用不明显；蔗糖150 gL^(-1)、硼酸100 mgL^(-1)时最适宜花粉管伸长；蔗糖的缺乏会导致胼胝质在花粉管顶端积累，使其生长停滞，缺硼时胼胝质在花粉管内分布正常。

The reformer tubes are the 3~ generation of new type centrifugally cast reformer tubes. The reformer tube subject to research has been in service for 11 years, which is an old tube that was replaced due to over-temperature caused by process operation and other equipment. This reformer tube was used as a specimen and a series of destructive tests were done on the samples taken from it.

该炉管为第三代新型离心铸造炉管，研究对象为一根已服役11年，由于工艺操作及其它设备原因出现超温而被更换下来的旧炉管，以该炉管为试件并进行取样，进行一系列的有损试验。

A method of segment installation is applied to fix tube pole by tower crane and auto-crane, In order to control the dot which is signed on steel tube exterior project to corresponding dot on the ground, a theodolite is set in each direction, In order to ensure quality, the weld of interface of steel tube pole should be executed from middle of plane to circumambience

钢管柱通过塔式起重机和汽车吊采用分节安装的方法进行安装，安装时从两个方向各架设1台经纬仪以控制钢管柱外壁标记点的投影在地面作出的相应标记点上。

In chapter 3, the equation for solving free vibration of tube in tube tall building, which is developed by using equivalent closed tube method, is proved strictly to be the fourth-order Sturm-Liouville differential equation.

第三章严格证明了按等代筒体法推导出来的筒中筒高层结构自由振动方程是四阶Sturm-Liouville微分方程。

Cold-roll void forming sheet is an important product in cold-roll forming sheet , which usually includes pipe, square tube, rectangle tube and unusual tube made by special requirements.

冷弯空心型钢是冷弯型钢中的一类重要产品，其通常包括圆管、方、矩形管以及按照特殊要求制作的异形管。

The results show that, when the electromagnetic field was applicated, the flowability and filling capacity of cupronickel alloy are increased, the surface cracks are eliminated, and the thin-walled cupronickel tube billets with smooth surface can be obtained due to the increase of flowability and filling capacity of cupronickel alloy. The solidification structure of the tube billets is evidently refined, the shape of Ni-rich phase changes from needle-like to bulk and the casting stress declines from 7.2 to 0.32 MPa. With the structure improving, the tensile strength and elongation increase by 5% and 36%, respectively, than those of ordinary continuously cast tube billets.

结果表明：在连铸过程中施加旋转电磁场能够提高金属液的流动性和充型能力，消除表面裂纹缺陷，从而制备出表面光滑的薄壁白铜管坯；在电磁力的作用下管坯凝固组织显著细化，富镍相由针状转化为团块状，同时铸造应力由未施加电磁场时的7.2 MPa下降至0.32 MPa；随着凝固组织的改善，施加磁场的管坯抗拉强度和伸长率与未施加磁场管坯的相比分别提高5%和36%。

The optical source device includes a flexural luminous tube used to produce optical source and can compensate the brightness of the two ends by the flexural structure of the two ends, and a shroud component installed on flexural part of the two ends of luminous tube to defilade part of light from luminous tube.

该光源装置包含：一弯曲灯管，用来产生光源，并藉由两端的弯曲结构补偿两端的亮度；以及一组遮蔽组件，安装于灯管两端弯曲的部分位置来遮蔽该灯管的部分光线。

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。