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gate
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  闸门
    A method for the calculation of added mass of a rising sector gate with rotational vibrations
    弓形闸门旋转振动附加质量的计算方法
短句来源
    Study on Discharge Coefficient for Steady Free Outflow under a High Dam Spillway Gate
    高坝平板闸门闸孔恒定自由出流流量系数研究
短句来源
    Study on vibration of bottom outlet gate for Three Gorges Project by hydroelastic model
    三峡大坝导流底孔闸门流激振动水弹性模型试验研究
短句来源
    Hydrodynamic load and gate's vibration
    水动力荷载与闸门振动
短句来源
    Study on Hydrodynamic Characteristics of High Water-Head Flat Gate
    高水头平板闸门水力特性研究
短句来源
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    Study on Discharge Coefficient for Steady Free Outflow under a High Dam Spillway Gate
    高坝平板孔恒定自由出流流量系数研究
短句来源
    The relations between effects of sediment diversion and locations of the gate situated at the straight reach, concave bank, protruding bank in the main river are obtained.
    不同河段不同位是决定引水引沙效果的主要因素,试验得出了直段、凹岸和凸岸的位引沙效果的各种关系,不同河段不同位,引水引水角度对引沙效果影响相对较小;
    Influence of Seepage Around Abutment on Safety of Dam and Gate and Their Foundation
    绕渗对坝及地基的安全影响
短句来源
    Technical Problems Existing in Telematering System of Water Level and Gate Opening
    水位、位遥测系统存在的技术问题及其处理
短句来源
    Research on discharge automatic measurement system for diversion gate from Yellow river in Zhangcaiyuan
    张菜园引黄流量自动测量系统研究
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  “gate”译为未确定词的双语例句
    Experimental Study on the Result of Energy Dissipation of Flaring Gate Pier for Low Dam Pivot
    低坝枢纽宽尾墩消能效果研究
短句来源
    Application of Field Programming Gate Array (FPGA) to High Resolution Induction Tool (HRIT)
    FPGA在高分辨率感应测井仪中的应用
短句来源
    Multi-time and frequency gate seismic data processing and its application in the multi-target Mesozoic reservoir
    多目标储层地震分时频处理技术
短句来源
    3-D numerical modeling of spillway with flaring gate piers for high arch dams
    高拱坝宽尾墩三维流场数值模拟
短句来源
    Numerical simulation of energy dissipator with new style flaring gate pier and stepped spillway
    新型宽尾墩和阶梯式溢流坝面一体化消能工数值模拟
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  gate
Carbon-Nanotube-Based Normally-on-Driving Under-Gate Field Emission Display Panel
      
A carbon-nanotube-based normally-on-driving under-gate field emission display (FED) panel and its operation principle are presented.
      
The image is realized by modulating the voltage of under-gate, whose value is less than the cathode voltage, to stop the cathode producing field emission electrons.
      
The results indicate that a uniform and large emission area can be obtained in this new under-gate FED panel.
      
This study provides powerful theoretic support for the feasibility of this new kind of under-gate FED panel.
      
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Based on some information of field observation, the paper presents a preliminary investigation on steady non-uniform aerated flow in rectangular channel downstream of a high-head sluice gate. It points out that the usual practice is to design a narrow and short channel downstream of the gate and the flow is usually a decelerating one. Some flow characteristics such as the variation of mean air concentration along the flow, the gradient of air concentration along the depth and the side wall effect...

Based on some information of field observation, the paper presents a preliminary investigation on steady non-uniform aerated flow in rectangular channel downstream of a high-head sluice gate. It points out that the usual practice is to design a narrow and short channel downstream of the gate and the flow is usually a decelerating one. Some flow characteristics such as the variation of mean air concentration along the flow, the gradient of air concentration along the depth and the side wall effect on air entrainment, are quite different from those encountered in wide and shallow channels. Hence the empirical formula for wide channels for computing the water surface profile cannot be used for narrow channels. The author, with due consideration pointed above, gives an analytical treatment of plotting surface profile for the latter case. With the introduction of a parameter"σ" characterizing the related flow phenomena a simple formula is recommended as logσ=1.77+0.0081(V~2/gR) where σ=the ratio of the difference between the water depths in an aerated flow and in the corresponding non-aerated flow of the absolute channel roughness, V=sectional mean velocity of non-aerated flow, g=gravitational acceleration, R=hydraulic radius of the cross-section of non-aerated flow. Charts and illustrative examples are also included for reference for designers.

本文对深孔闸后矩形槽恆定不均匀掺气水流进行了初步探讨。文中指出,在通常工程布置条件下,此种渠槽一般属于窄短渠槽,且水流沿程多呈減速流动,因而掺气水流运动的某些特性,如:水流的沿程平均掺气浓度变化规律、沿垂向的摻气浓度梯度、以及边墙对掺气量的影响等,均与宽浅渠槽中的掺气水流不同.文中针对上述特点,根据一些原型观测成果,提出了适用于此类布置的摻气水面线计算公式,并在原型中初步得到较好的验証.文末列有图表算例以供设计计算参考。

This paper studies the flowing characters of the double sluice openings with a drop down flow in the gate shaft through the body of a certain gravity dam and analyses particularly their effect on the discharge capacity. The principles and methods of calculating the discharge capacity of double sluice openings with a drop down flow in the gate shaft have been proposed and the formulas for calculating the discharges are listed with their corresponding coefficients given.

本文研究了某重力坝坝身双层孔洩水和闸门井串水的水流特点,着重分析了它们对 洩流能力的影响。文中提出了双层孔洩水和闸门井串水时洩水孔洩流能力的计算原则及 方法,列出了流量的计算公式,并给出了一些经验系数值。

Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.A finite element method based on the variational principle for variable domains is proposed for this type of problems. As shown in Fig.1, the domain of solution is divided by a prescribed F curve into two sub-domains,the fixed ABEPQGMNOA and the variable EFQPE with the free stream line as its boundary. Triangular elements and linear distribution of ψ are adopted...

Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.A finite element method based on the variational principle for variable domains is proposed for this type of problems. As shown in Fig.1, the domain of solution is divided by a prescribed F curve into two sub-domains,the fixed ABEPQGMNOA and the variable EFQPE with the free stream line as its boundary. Triangular elements and linear distribution of ψ are adopted for the inner region,while trapezoidal elements and linear distribution of q2 for the variable domain. The unknowns to be solved for are the values of ψ of the nodes and the ordinates of points on the free surface. Equating the partial derivatives of the functional to zero furnishes enough equations,thus,the location of the free surface and the values of ψ are solved for simultaneously. The method is applied to free surface sluice gate flow over spillway and computed pressure distribution agrees satisfactorily with experimental results.

用有限元法计算水力学问题的困难之一是如何处理自由水面.因自由水面的位置在计算前是不知道的,求解的区域就不能预先确定.常用的方法是先假定自由水面的位置,把问题当作具有已知边界的问题来计算,然后校核沿自由水面的条件是否满足.如不满足,再重新修改自由水面的位置进行计算,直到能满足为止.本文建议,从可变区域的变分概念出发,把决定自由水面形状的座标和各结点的流函数值当作未知量,形成方程组同时求解.用这种方式可以减少计算的工作量,算出的溢流面压力分布资料和试验结果符合较好.

 
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