China Three Gorges Corporation

Globalfoundries U.S. Inc.

China Institute of Water Resources and Hydropower Research

Hohai University

Chang Jiang River Scientific Research Institute

China Three Gorges Co., Ltd.

Hanqing Zhao

Huichao Dai

Xu Zhang

Hao Wang

Dan Liu

Dingguo Jiang

Tao Wang

Gang Wang

Xuan Li

Mingming Zhang

Yang Yu

Xinlei Guo

Jing Yan

Jie Dai

Chengxiao Zhang

Lukun Zhai

Hui Fu

Yijun Zhao

Hongwu Tang

Jiajia Pan

Ping Ji

Jiazhen Li

Yongxin Guo

Yafei Duan

Qingqing Li

Jijun Xu

Zhengjie Yin

Chunhua Yang

Limo Tang

Xiaoli Wang

Jinyu Zheng

Zhiwu Liu

Guiwen Rong

Qingqing Chen

Xuting Yang

Lingling Wang

Boyu Mi

Dinghua Meng

Yanhong Chen

Ran Zhai

Jingqiao Mao

Peipei Zhang

Xiaoting Liu

The present invention relates to a method for calculating a head loss coefficient and branch pipe flow distribution of a multi-point water intake. The method includes the following steps: inputting and determining a structure and size information of the multi-point water intake; determining a head loss coefficient; determining a head loss coefficient form of a confluence port; pre-estimating or adjusting a trial flow; performing trial calculation on the head loss coefficient of each branch pipe; comparing the head losses calculated by two flow paths; and carrying out overall calculation. According to the present invention, the flow of each branch pipe is adjusted and the head loss coefficient is repeatedly calculated by utilizing iterative calculation of the head loss coefficients of the flows in two directions, so that the head loss and the flow distribution proportion can be finally and accurately calculated.

Method for calculating head loss coefficient and branch pipe flow distribution of multi-point water intake

Amplifier devices includes a first amplifier connected to receive an input voltage. The first amplifier outputs an internal voltage. These structures also include a second amplifier having an input node connected to receive the internal voltage and an output node outputting an output voltage. A resistive feedback loop is connected to the input node and the output node of the second amplifier. A first cross-coupled bandwidth boosting stage is connected to the input node of the second amplifier and a second cross-coupled bandwidth boosting stage connected to the output node of the second amplifier. The cross-coupled bandwidth boosting stages form a distributed differential positive feedback structure.

Amplifier having distributed differential positive feedback

Apparatuses include (among other components) a first gain device connected to receive an initial voltage, a second gain device in series with the first gain device and connected to receive output of the first gain device, differential gain devices connected to receive outputs from the first gain device and the second gain device (the differential gain devices provide opposite voltage outputs from the apparatus) and high-frequency compensation feed-forward paths connected to the first gain device and the second gain device.

Single-to-differential converter

A main stream reservoir ecological modulation method considering incoming water from interval tributaries is provided. The method determines the contribution ratio of the incoming water from interval tributaries to first-day's water rising in a high-flow surge process and when to start ecological modulations of spawning ground sections, determines a river course routing method after a main stream and its tributaries joining and calibrating parameters, based on past hydrological data, performing river flow calculation on the discharge volume of upstream reservoirs and the flow after interval tributaries joining, and determines a main stream reservoir ecological modulation mode considering incoming water from interval tributaries.

Main stream reservoir ecological modulation method considering incoming water from interval tributaries

The present invention relates to a variable-flow-path air valve for water hammer prevention and a design method. The variable-flow-path air valve includes a valve body with a top provided with an air intake-exhaust port. A ball valve seat and a floating ball are arranged below the air intake-exhaust port. The valve body is provided with at least one swing check valve configured to be opened inward. The swing check valve includes: a swing valve disc connected to a valve body hinge, a variable-flow-path air inlet controlled by the swing valve disc to open and close, a device for limiting the opening degree of the swing valve disc, and a sealing device. In the present invention, the air valve takes in air through the air intake-exhaust port and the variable flow path, and discharges air only through the air intake-exhaust port.

Variable-flow-path air valve for water hammer prevention and a design method

A method for determining flow velocity distribution in the roughness sublayer is provided, which uses the experimental device that includes a variable-slope circulating flume system and a flow-measuring system, the variable-slope circulating flume system is used to study flow in the roughness sublayer, and the flow-measuring system is used to measure flow velocity in each zone in the flume. In the variable-slope circulating flume, the method according to the invention uses cylindrical aluminum rods to simulate large-scale roughness elements, and the submergence, the average bulk flow velocity and the distribution density of roughness elements are changed.

Method for determining flow velocity distribution in roughness sublayers

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Beijing, China

Hanqing Zhao