摘要：In order to evaluate the effects of the short blade locations on the anti-cavitation performance of the splittel bladed inducer and the pump, 5 inducers with different short blade locations are designed, Cavitation simulatior and experimental tests of the pumps with these inducers are carried out. The algebraic slip mixture model in th CFX software is adopted for cavitation simulation. The results show that there is a vortex at the inlet of the indu（ er. Asymmetric cavitation on the inducer and on the impeller is observed. The analysis shows that the short blad locations have a minor effect on the internal flow field in the inducer and on the external performance of th pump, but have a significant effect on the anti-cavitation performance. It is suggested that the inducer shoul be designed appropriately. The present simulations found an optimal inducer with better anti-cavitatio performance.

摘要：Traditional music culture,from perspective of axiology,is considered the essence of arts of the era which witnesses the innovation of musical culture in various historical periods and drives the development of modern music,in which creative thoughts and ideas cherish the factor and perfection making a new request to aesthetics of its ***,blending traditional music culture with modern music composition will generate new characteristics of classic elegance,artistic beauty and epoch aesthetics,bringing a new trend of the modern music composition into being and propelling actively to form creative thoughts and innovative ideas by utilizing inheritance and innovation of traditional music as carriers.

摘要：这个问题赶出为线性变化时间的不明确的周期的描述符系统的稳定被重游。为线性变化时间的不明确的周期的描述符系统基于柔韧的稳定性的概念，为柔韧的稳定性的一个必要、足够的条件被提出。柔韧的稳定问题也被学习，相应必要、足够的条件用双系统的符号被给。获得的矩阵不平等条件能被转变到与一些免费矩阵的介绍的线性矩阵不平等一，它使分析和设计过程简单、可靠。

摘要：工业现场的恶劣电磁环境对硬件电路系统提出了越来越高的电磁兼容性要求。为了避免电磁干扰可能导致的误跳闸或误报警等事故,探讨了工业现场硬件系统的电磁兼容性设计策略。讨论了电磁环境对硬件系统的影响与抗电磁干扰设计理念,剖析了可能的电磁干扰源与抗电磁干扰机理,针对数字电路在电磁干扰下的行为,研究了电磁兼容性设计问题。实验效果验证了电路的合理布局与布线以及良好接地是必须采取的抗电磁干扰措施。工程实践表明:上述提出的电磁兼容性设计策略是行之有效的。

摘要：将逆系统方法与模糊神经网络相结合,提出一种基于模糊神经网络α阶逆系统的发酵过程解耦控制方法.在分析了系统可逆性的基础上,利用模糊神经网络建立发酵过程的非线性逆模型,然后将得到的模糊神经α阶逆系统与发酵过程串联复合成伪线性系统,最后设计专家控制器实现高性能闭环解耦控制.仿真结果表明,提出的解耦控制方法能够适应发酵过程模型的不确定性和参数的时变性,具有较强的鲁棒性,克服了解析逆系统解耦控制方法依赖于过程模型和对模型参数的变化很敏感的缺点,且结构简单,易于实现.

摘要：近年来我国棉花生产，要么产量受制于缺钾引起的早衰，要么过量施钾导致生产成本增加和养分流失。然而，最适宜棉花生物质积累和增加产量的钾肥用量并不明了，因而也无适宜的施钾量推荐给农民。因此，采用大田试验（随机区组设计）和盆栽试验研究了钾肥用量对棉花（华杂棉H318）生物量和产量的影响。结果表明，K2处理（225kg hm^-2）产量（1341kg hm^-2）最高，单位面积成铃数（74个m^-2）最多，盆栽试验结果具有相同趋势。同样，K2的棉株生物量，在各个取样时期都最大，尤其是生殖器官生物量。在5个钾肥用量（0～450kg hm^-2）处理中，棉株生物质快速累积期几乎同时启动，但终止期存在一定差异。棉株生物质快速累积期间，K2处理无论是营养器官还是生殖器官生物质的平均累积速度、最大累积速度均最高。可见，在长江中游棉区中等肥力棉田，同时施用N300kg hm^-2和P20590kg hm^-2的条件下，钾肥用量225kg hm^-2更有利于棉花提高产量，因为在这一用量条件下棉株生物质累积速度最快、累积量最大。