排序方式： 共有17条查询结果，搜索用时 359 毫秒
1.
本文包括三部分内容.第一,通过自相关函数的算法得出F_0曲线.第二,利用曲线拟合确定调形.第三,提出声调曲线的新的规整方法,确定调值. 相似文献
2.
ABSTRACT Studies in several sports have shown the benefits of adapting the playing environment to fit junior players. Frequently the changes are pragmatic choices based on space constraints or existing line markings, or the result of simple scaling based on stature. In this study, a method of scaling the cricket pitch length is presented which is based on the age-specific size and performance of the bowlers and batters. The objective was a pitch length which enabled young bowlers to bowl good length deliveries while releasing the ball at a more downward angle, similar to elite bowlers. The steeper release angle has the benefit of reducing the sensitivity of the ball flight distance to the variability of ball release. Based on data from county standard under-10 and under-11 players a pitch length of 16.22 yards (14.83 m) was calculated, 19% shorter than previously recommended for under-11s in England. A shorter pitch also increases the temporal challenge for batters, encouraging a wider variety of shots and improved anticipation skills. Pitch lengths scaled in this way to fit the players’ abilities as they develop will enable a more consistent ball release by bowlers and more consistent temporal demand for batters. 相似文献
3.
语音信号处理过程包括对需处理的音频信息进行过滤、解析和音频特征提取三个步骤,本文主要针对音频特征中的音调提取算法进行改进。 相似文献
4.
王大昌 《江西教育学院学报》2001,22(1):59-62
就教学中如何训练学生演奏二胡时能发出节奏准确、音高精良和音色优美的琴音，本文就此从心理上、生理上和技巧上逐一作了多侧面的分析及直观而明晰的论述。 相似文献
5.
采用蒸馏厂的下脚料——植物油沥青为主要原料,制备一种新型铸造用粘结剂,当粘结剂加入量为3%时,其干拉强度可达到3.15MPa,。该粘结剂性能优良,且价格低廉,适用于铸造生产。 相似文献
6.
针对一个并联式涡轮基组合循环(Turbine Based Combined Cycle, TBCC)发动机排气系统的气动方案,对其在整个飞行包线范围内典型工作点上的流场进行了数值模拟研究,获得了飞行包线范围内排气系统相应的推力系数、升力、俯仰力矩随飞行马赫数的变化关系。计算结果显示,在整个飞行包线范围内,排气系统的轴向推力系数随着飞行马赫数先减小后增大,在跨声速飞行时降到最低 Ma=0.9,涡喷不加力时为0.562,加力时0.662),在设计点附近达到最大;升力和俯仰力矩性能在亚声速及跨声速飞行时较差,在超声速飞行时随着飞行马赫数增加逐渐好转。表明排气系统在跨声速飞行范围内工作时应采取措施以改善其性能。 相似文献
7.
应用关于信号的小波变换摸当选择其小波函数为平滑数的一阶导数时在剧变点处表现为极大值的理论,提出用语音信号的小波变换模来检测声门的开启时间,从而确定音调周期的方法,并给出相应的小波算法。 相似文献
8.
9.
ABSTRACTThis study sought to determine whether playing on a shorter cricket pitch would lead batters to make more appropriate decisions about whether to play front foot or back foot shots. Based on an analysis of the shots played by top order batters against seam bowling in county under-10 matches, an age-specific “good length” region between 5.0 yards and 6.5 yards (4.57 to 5.94 m) from the batters’ stumps was derived. This was where batters were uncertain whether to play on the front or back foot. It was then possible to define deliveries as “short” or “full” depending upon whether they bounced further from or nearer to the batter than the good length region. Club under-11 and county under-10 match data revealed that when playing on a 16-yard pitch batters played more back foot shots to short balls, and county batters also played more front foot shots to full balls compared with matches on the currently recommended 20- or 19-yard pitches. For batters, a shorter pitch should strengthen the coupling between the perception of delivery length and appropriate shot selection, and the increased task demand should lead to improved anticipation, both key features of skilled batting. 相似文献
10.
原材料质量控制分为进场质量检测和原材贮存质量管理两部分。沥青、集料、填料作为组成沥青混合料的原材料,是影响混合料质量的主要因素,因此只有控制好原材料质量,才能实现原材料到优质沥青混合料的良好转化。 相似文献