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Pulsed magnetic fields ; Helmholtz coils ; osteoporosis ; bone mineral density

脉冲磁场；亥姆赫兹线圈；骨质疏松；骨密度

By using hall sensor,we have developed a high-speed magnetic field testing system with USB2.0 interface.The software has been developed and the testing system has been designed,in which the center distance of the helmholtz coils is adjustable.

利用霍尔传感器件，自带 USB2.0以及10位快速A/D的高性能单片机C8051F340，研制了单芯片高速磁场数据测量装置，编写了磁场数据采集处理程序，设计了中心距可调的亥姆霍兹线圈，并用所研制的仪器进行了轴向磁场分布测量。

This device, which is composed of oscillator, switching capacitor, second-order tracking system, digital switching system, power-amplifier circuit and Helmholtz coils , can produce rotating magnetic field whose frequency and strength can be adjusted continuously.

该装置由振荡器、开关电容、二阶跟踪系统、数字开关系统、功放电路及亥姆霍兹线圈组等部分组成，可以产生频率、强度连续可调的旋转磁场。

pulsed magnetic fields; Helmholtz coils; osteoporosis; bone mineral density

磁场热及非热生物效应的研究已成为国内外生物工程学界的研究热点［1］。

Proof of this has usually rested on demonstrating that individuals whose ability to perceive the magnetic field is disrupted (by having small magnets attached to them or by being kept in cages surrounded by Helmholtz coils) cannot orient correctly, whereas control animals can.

要证明这一点，通常要用实例显示：如果动物个体的感知磁场能力受到破坏(通过在它身上系上小块磁条，或者把它关在由赫姆霍尔茨线圈包围的笼子里)，那么它就不能确定正确的方向，而对比动物却能够确定正确方向。

Permanent magnet can provide for a maximum intensity of the magnetic field around Tesla, Helmholtz coils and solenoids can provide alternating magnetic field or relatively uniform magnetic field, and solenoids can also be used to provide strength for the solenoid around 10 Tesla.

其中永磁铁能够提供强度最大为1特斯拉左右的静磁场，亥姆霍兹线圈和螺线管可提供交变磁场或相对均匀的磁场，也可用螺线管提供强度为10特斯拉左右的超强静磁场，电磁铁则可产生强度为几百毫特斯拉或特斯拉级的静磁场。

The deflection yoke has an electrically insulative liner (15) with vertical (17) and horizontal deflection coils (13) attached thereto.

该偏转磁轭包括具有与其附接的垂直(17)和水平偏转线圈(13)的电绝缘衬套(15)。

The rod receiving apertures extend through the liner at spaces between the vertical and horizontal deflection coils.

该杆接纳孔在垂直和水平偏转线圈之间间隔地延伸穿过衬套。

A ferrite core is located close to the vertical deflection coil to reduce the loss in the magnetic force generated from the horizontal and vertical deflection coils, and to enhance their magnetic efficiency.

铁氧体磁芯，位于邻近所述垂直偏转线圈的位置，用于减少所述垂直偏转线圈和水平偏转线圈产生的磁力的损失；校正单元，与所述水平偏转线圈隔开预定距离，用于校正所述垂直偏转磁场和水平偏转磁场的几何失真。

The cap is positioned on the rear end of the liner such that the vertical and horizontal deflection coils are received between the outer wall and the tabs, and the projections are received in the projection receiving slots.

盖位于衬套的后端上，使得垂直和水平偏转线圈接纳在外壁与凸片之间，并且伸出件接纳在伸出件接纳槽中。

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。