Grain-size class-Std(GSCStd) and Grain-size class-dD(GSCdD) methods are simple statistical approaches for classifying bulk grain-size distributions(GSDs) into grain-size fractions. Although these two methods were deve...Grain-size class-Std(GSCStd) and Grain-size class-dD(GSCdD) methods are simple statistical approaches for classifying bulk grain-size distributions(GSDs) into grain-size fractions. Although these two methods were developed based on similar statistical principles, the classification difference between these two methods has not been analyzed. In this study, GSCStd and GSCdD methods are conducted in thirteen grain-size data sequences to examine the applicability for identifying grain size fractions. Results show that, application of the GSCStd method is equivalent to that of the GSCdD method in identifying finer grain-size fractions, and the difference between the two methods mainly comes from the identification of coarse grain-size fractions. Thus, finer grain-size fractions are recommended for use in research of surface aeolian and paleo-aeolian sediments. In addition, our results do not completely agree with previous studies, coarser grain-size fractions in our case suggest that the GSCdD method may not be more applicable than the GSCStd method.展开更多
介绍了基于DDS（direct digital frequency synthesis，直接数字频率合成）芯片AD9833的电子耳蜗无线传输模块电路。首先描述了该模块的硬件组成原理，并对其中的SPI接口、DDS调制以及功率放大电路做了较为详细的介绍，其次介绍了该模...介绍了基于DDS（direct digital frequency synthesis，直接数字频率合成）芯片AD9833的电子耳蜗无线传输模块电路。首先描述了该模块的硬件组成原理，并对其中的SPI接口、DDS调制以及功率放大电路做了较为详细的介绍，其次介绍了该模块的软件设计方法。实验结果表明采用这样的无线传输模块，简化了电子耳蜗电路设计，同时还保证了较高的能源转换效率。展开更多
基金supported by project funding from Chongqing Normal University (No. 12XLB009)Key Projects in the National Science & Technology Program (No. 2006BAD26B0302)
文摘Grain-size class-Std(GSCStd) and Grain-size class-dD(GSCdD) methods are simple statistical approaches for classifying bulk grain-size distributions(GSDs) into grain-size fractions. Although these two methods were developed based on similar statistical principles, the classification difference between these two methods has not been analyzed. In this study, GSCStd and GSCdD methods are conducted in thirteen grain-size data sequences to examine the applicability for identifying grain size fractions. Results show that, application of the GSCStd method is equivalent to that of the GSCdD method in identifying finer grain-size fractions, and the difference between the two methods mainly comes from the identification of coarse grain-size fractions. Thus, finer grain-size fractions are recommended for use in research of surface aeolian and paleo-aeolian sediments. In addition, our results do not completely agree with previous studies, coarser grain-size fractions in our case suggest that the GSCdD method may not be more applicable than the GSCStd method.
文摘介绍了基于DDS（direct digital frequency synthesis，直接数字频率合成）芯片AD9833的电子耳蜗无线传输模块电路。首先描述了该模块的硬件组成原理，并对其中的SPI接口、DDS调制以及功率放大电路做了较为详细的介绍，其次介绍了该模块的软件设计方法。实验结果表明采用这样的无线传输模块，简化了电子耳蜗电路设计，同时还保证了较高的能源转换效率。
