Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.

China Three Gorges Corporation

Yuan Gao

Peng Li

Jing Yang

Fangzheng Wang

Yong Sun

Zhe Ma

Zubing Zou

Zhe Li

Xiquan Liu

A method and device for determining a suction height of a variable speed unit is provided. The method includes: acquiring a reference cavitation coefficient and a reference specific rotation speed parameter corresponding to a target water head section in a preset number of power stations; conducting calculations on the reference cavitation coefficient and the reference specific rotation speed parameter by utilizing a target scheme to obtain a target formula; acquiring a maximum lift, a minimum lift, a speed variation range and a synchronous rotation speed value of a current target variable speed unit and input force values of the target variable speed unit at a plurality of key working condition points; and determining a target suction height of the target variable speed unit.

Method and device for determining suction height of variable speed units

A borate fluorescent powder and a preparing method thereof are provided. The formula of the borate fluorescent powder is BaSrLuLCeTbEuBO. L is one or any combination of the elements Gd, La, and Sc. Ranges of x, y, z, m, and n are respectively 0&#x3c;x&#x2264;0.6, 0&#x3c;y&#x2264;3, 0&#x3c;z&#x2264;0.4, 0&#x2264;m&#x2264;1, and 0&#x2264;n&#x2264;0.5. The borate fluorescent powder provided has a stable crystalline phase, high luminous efficiency, and decent thermal stability, and can be applied to ultraviolet LEDs or near-ultraviolet LEDs to construct white LEDs.

Borate fluorescent powder and preparing method thereof

Growing community of inventors

Wuhan, China

Yuan Gao