In the paper, model of ballast pump is established according to the principle of centrifugal pump.

Calculation of Parameters for Gas Ballast Pump

气镇泵的参数计算

Cargo and ballast pump speed control system

货油及压载泵转速控制系统

Function test and automatic controller test for ballast pump.

压载泵效用试验和自动控制装置试验。

Disclosed is an electronic ballast for fluorescent lamp.

荧光灯电子镇流器。

Discussion on the Standard about Power-loss of Magnetic Ballast for Fluorescent Lamp

管形荧光灯电感镇流器的能耗标准探讨

Single-Chip Electronic Ballast for Fluorescence Lamp

用于荧光灯的一种单片电子镇流器

High Power Factor Dimmable Electronic Ballast for Fluorescent Lamp

高功率因数可调光荧光灯电子镇流器

A Design of High Power Dimmable Electrical Ballast for Ultraviolet Lamp

一种大功率可调光紫外灯电子镇流器的设计

Research on digital control strategy of electronic ballast for MH lamp

数字控制金卤灯电子镇流器

The Design of the Electric Circuit of an Electronic Ballast Fluorescent Lamp

一种电子镇流器荧光灯的电路设计

But in fact, due to the great variation of ballast resistance during track work and change of "stress free temperature" of the rail, they are hard to measure then hard to control.

但道床阻力在作业时变化很大，钢轨在线路上长期使用，锁定轨温可能发生变化，温度力亦不易控制。

By many years experiences, controlling ballast resistance and excessive compressive temperature force of the rail is recognized as the only means to overcome the track buckling.

多年来认为控制道床阻力及钢轨内的温度力是防止胀轨跑道的主要办法。

Spring elements to simulate the lateral and longitudinal ballast resistance s, taking into account the nonlinear peculiarity of the ballast resistance.

弹簧单元模拟道床的横向、纵向阻力，并考虑了道床阻力的非线性特性。

The Effects of Train Braking and Ballast Resistance on the Longitudinal Force in Rail

列车制动与道床阻力对钢轨纵向力的影响分析

Study on Testing Method for Ballast Resistance of UM-71 Jointless Track Circuit

无绝缘轨道电路道碴电阻测试方法的研究

Discussion on the New Testing Method of Ballast Resistance

道床阻力测试方法的新探讨

The stability conditions of multipin-to-plate discharge of transverse discharge excited CW CO2 laser have been analysed. The dependence of the discharge stability on the series ballast resistance and tne application of stable current regulator are discussed.

本文分析了多针对平板放电、横向电激励CO2激光器的稳定性条件，论述了放电稳定性与镇流电阻的关系，以及稳流调节器的应用。

A bag filled with sand and used as ballast, in the formation of protective walls, or as a weapon.

装满沙土的袋子，用作压载物以筑造防护堤，或者作为武器。

The ballast and junction box is selected by user.

镇流器、接线盒由用户选择。

The ballast junction box and the high of lamp-post can be matched by users'choice;

镇流器，接线盒及灯杆高度可由用户选择；