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The deuterium oxide curve completely encompassed the water curve.


Consequently, the number of peaks from DSC(water) curve could be another qualitative criterion for distinction between a recently manufactured leather and a patrimonial leather.


The light water curve has not been moved down by any new form of mathematical adjustment, but the heavy water curve most certainly has been moved.




 A threeblade controllable pitch propeller series with expanded area ratios of 0.35, 0.5 and 0.65 has been developed for improving motion behaviour of the ship and ocean engineering. All experimental results of a series are presented here. The fairing of the open water test results and hydrodynamic blade spindle torque test results has been performed by means of a regression analysis. Also, regression analysis for the calculation value of the centrifugal blade spindle torque has been performed. The regresive... A threeblade controllable pitch propeller series with expanded area ratios of 0.35, 0.5 and 0.65 has been developed for improving motion behaviour of the ship and ocean engineering. All experimental results of a series are presented here. The fairing of the open water test results and hydrodynamic blade spindle torque test results has been performed by means of a regression analysis. Also, regression analysis for the calculation value of the centrifugal blade spindle torque has been performed. The regresive coefficients, open water curves, hydrodynamic and centrifugal blade spindle torque curves, and (B~pδ)~(1/2) diagrams for three expended area ratios area given in the paper.  为改善船舶推进和海洋工程动力定位的性能,我们对可调螺距螺旋桨进行了多方面研究。已完成了盘面比为0.35、0.50和0.65的JDC三叶可调螺距螺旋桨系列的试验研究。获得了JDC系列全部试验结果。敞水试验数据按盘面比、初始螺距比、进速系数,转角、进速系数,初始螺距比及其相应的转角、进速系数三种组合进行多元回归分析,给出敞水曲线及其相应的多项式的系数和幂。水动力转叶力矩试验数据在不同盘面比时,按初始螺距比、转角、进速系数进行多元回归,给出水动力转叶力矩系数曲线及相应的多项式的系数和幂,离心力转叶力矩系数的计算值,在不同盘面比时按设计螺距比、转角进行多元回归,给出离心力转叶力矩系数曲线及其相应的多项式的系数和幂。最后给出各盘面比的B~(1/2)_pδ图谱,供设计使用。  The series of ducted three blade controllable pitch propellers is made up of JDC three blade controllable pitch propeller series and simplified duct JD 7704 developed by Ship Hydrodynamics Laboratory of the Shangha' Jiaotong University.All experimental results are presented here.The fairing of all experimental results has been performed by means of a regression analysis.The regressive coefficients, open water curves, hydrodynamic and centrifugal blade spindlle torque curves, and diagrams are also... The series of ducted three blade controllable pitch propellers is made up of JDC three blade controllable pitch propeller series and simplified duct JD 7704 developed by Ship Hydrodynamics Laboratory of the Shangha' Jiaotong University.All experimental results are presented here.The fairing of all experimental results has been performed by means of a regression analysis.The regressive coefficients, open water curves, hydrodynamic and centrifugal blade spindlle torque curves, and diagrams are also given in the paper.  为改善船舶推进和海洋工程动力定位的性能,对导管螺旋桨及可调螺距螺旋桨进行了多方面的研究工作。采用导管可调螺距螺旋桨可兼顾二者之优点进一步改善其推进性能。 利用交通大学JDC三叶可调螺距螺旋桨系列和JD7704导管组合成导管调距桨系列,本文提出了全部试验及分析结果。 用多元回归分析方法对全部试验结果进行处理。最后,给出了回归系数,敞水性征曲线,水动力及离心力转叶力矩值以及(B_p)~(1/2)δ图谱,供设计使用。  This paper studios how to determine the range of inundation and suggests some preventive measures.Combines with the study for Hongshan reservoir,the paper has put forward an easy way to solve the problem,that is:to set up a parameter of distribution proportion and use the shortterm hydrological data to deduce the"analogous annual flow"as threestation incoming flow for different frequency years.The monthly average flow of July and August is taken as the basis for calculating the water curve of the river.The... This paper studios how to determine the range of inundation and suggests some preventive measures.Combines with the study for Hongshan reservoir,the paper has put forward an easy way to solve the problem,that is:to set up a parameter of distribution proportion and use the shortterm hydrological data to deduce the"analogous annual flow"as threestation incoming flow for different frequency years.The monthly average flow of July and August is taken as the basis for calculating the water curve of the river.The accuracy of fitting of envelop curve obtained in this way is higher than that of the trial method and the graphic method.The inundation range thus determined is close to reality.and the preventive measures are feasible.  本文研究如何确定浸没影响范围,并给出防治措施.结合红山水库的专项研究,提出简易办法;建立分配比例系数,利用短系列水文资料,推出"类比年流量"作为不同频率年三个进库站的来流量.取7、8月份的月平均流量作为推算河道水面线的依据,应用计算机算得水面线外包线的水位,拟合精度超过了试算法和图解法.本办法确定的浸没范围接近实际,结合当地状况所提出的防治措施也是可行的.   << 更多相关文摘 
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