It deals with the invention and development of time-keeping apparatus in our country during a historical period of some three thousand years, tracing this development from remote antiquity with its sundial and clepsydra making use of the shadow of the sun down to the Dynasties of Han, Sui, Tang and Sung with their water-powered astronomical clockworks...

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The removal of CODcr: During the period of high temperature, when the hydraulic load increases gradually from 4.92 ml/L-d to 39.39 ml/L-d, the water quality of the effluent doesnt changes too much and the removal ratio stabilizes above 70% mostly; During the period of low temperature, the removal ratio of CODo can only reach 40% even if the hydraulic load is as low as 4.92 ml/L-d.

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The results also showed that the process of downflow combined with upflow wetland was better than other kind of combined process in cold and warm weather,the endurance of this kind of combination to high hydraulic loading was also more preferable than others.That is to say,the downflowupflow process was an ideal combined wetland process in treating wastewater.

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From the results obtained in the study, the following conclusions can be made:The methylene blue and spectrophotometer method can capture the free radicals generated successfully. This is an effective way to measuring the free radicals quantitatively in cavitation, moreover it is easy to fulfill.The intensity of cavitation increases with reduction in the cavitation number. But the different mechanism of various enhancive processes (chemical and physical processes) results in different effect by cavitation number.The effect of operating parameters, such as inlet pressure, temperature and time on cavitation indicate that optimum operating conditions exist at the cavitation enhancive effect is maximum.It is important to optimize the structure of hydrodynamic cavitation reactor for achieving a desired effect. A reasonable geometric parameter can promote the enhancive effect for a fixed hydrodynamic condition.Ventilating appropriate gas to cavitating flow can increase cavitational intensity and hence promote the enhancive effect of hydrodynamic cavitation.

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On the basis of Erne river intake of floodway , the method of hydraulic design and calculation for great flood diversion gates is studied .

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The calculating of its normal depth and critical water depth have no explicit function.

U形渠道斷面水力和結(jié)構(gòu)性能優(yōu)越日本操逼视频不卡，是渠道輸水工程中較常采用的斷面形式之一，水力計(jì)算中的正常水深无码日韩免费专区迅雷下载、臨界水深求解無(wú)顯函數(shù)形式的表達(dá)公式毛片一级农村毛片。

Analysing the investigations on the hydraulic characteristics of flood tunnels in recent years, the hydraulic research of flat-bottomed bottom outlets was carried out by means of physical model and theoretical analysis.

在對(duì)近年來(lái)國(guó)內(nèi)外有關(guān)泄洪洞水力特性文獻(xiàn)總結(jié)分析研究的基礎(chǔ)上，本文通過(guò)物理模型試驗(yàn)黄色网站在哪里、理論分析等研究手段對(duì)平底底孔的水力特性進(jìn)行了研究98偷窥自拍亚洲色图。

Consulted the hydrostat discount rate method used in the tunnel lining designation to determine the external water pressure, the slope stability factor algorithm simplified osmotic pressure in aeration zone to hydrostatic pressure after discount on the basis of investigation was suggested for the first time.

以現(xiàn)場(chǎng)調(diào)查為基礎(chǔ)，參照水工隧洞設(shè)計(jì)中考慮外水壓力的水力折減系數(shù)法欧美国产亚洲日本韩国VA，首次提出了將包氣帶滲透力概化為經(jīng)水力折減后的面力的簡(jiǎn)化算法济南宋刘村足疗店。

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The coupling model of hydraulic and mechanic was used with the iteration solving method.

分析時(shí)考慮了水力模型和力學(xué)模型的耦合看真人性爱视频，采用水力和力學(xué)模型逐步迭代的方法求解美国黄色大片一区二区。