Research on digital control strategy of electronic ballast for MH lamp

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；

When the high pressure mercury lamp, high pressure sodium lamp and Matallic Halide lamp is selected by custom who need equip relevant flameproof ballast box.

用户采用高压汞灯、高压钠灯、金属卤化物灯光源时，须配套相应的隔爆型镇流器箱。

To design thickness of ballast bed is based on the required strength of track structure and partly the experience in national railway.

现行的地铁设计规范对道床厚度的选择仅根据轨道强度要求和国铁的经验确定。

The Low Cost Wide-Sleeper Ballast Bed Track with Damping Rubber Bits

廉价减振型宽枕碎橡胶道床轨道

Study on adjusting track irregularity of integrated ballast bed in urban elevated railway

高架铁路整体道床轨面不平顺调整的研究

Construction Precision Control of Chord Surveying Method for Ballastless Track Ballast Bed

无碴轨道道床竖曲线弦测法施工精度控制

Construction Method for Lower Part Work of Ballast Bed in Overhaul of OCS

石质路基区段接触网下部工程大修的施工方法

Test Analysis on the Quality State Parameter of Newly-Built Railway Ballast Bed

新建铁路道床质量状态参数试验分析

Construction technique for ballast bed on high speed railway

高速铁路有碴道床施工工艺的探讨

Calculations and Design of a Water-Cooled Ballast Variable Resistor for Strong Current

强流水冷镇定变阻器的计算和设计