喷射-搅拌耦合式浮选装置吸气机理研究

根据喷射吸气和搅拌吸气的特点,设计一种喷射-搅拌耦合式浮选装置。为研究该装置的吸气方式,对其吸气机理进行理论分析,并采用控制循环泵电机输入频率以调节喷射流量及控制液位的方法,分别对浮选装置的耦合吸气量与喷射流量的关系以及搅拌吸气量与叶轮转速的关系进行了试验研究。结果表明:搅拌吸气量随叶轮转速的增大呈二次函数关系增加,耦合吸气量随喷射流量的增加呈近似线性递增;受叶轮旋转和液位的影响,浅液位(hy≤140 mm)时,耦合及搅拌吸气区共同吸气;深液位(hy>140 mm)时,搅拌吸气量很小甚至为零,主要为耦合吸气区吸气;低喷射流量(电机频率小于35 Hz)时,耦合吸气量随液位的升高先增大后减小,高喷射流量(电机频率大于30 Hz)时,随液位的升高而增大;而搅拌吸气量随液位的升高均急剧减小。最大频率50 Hz、最深液位230 mm时的最大总吸气量约为4.03 L/min,基本满足浮选吸气要求。吸气机理的研究为该装置的进一步分选研究提供理论参考。

Synchronization of two electrically coupled inspiratory pacemaker neurons

Synchronization is considered to be a crucial mechanism that maintains respiratory rhythm.For understanding the effect of electrical coupling on the transition of the firing patterns and synchronization,we coupled two inspiratory pacemaker neurons together,and studied various synchronous behaviors between them.We firstly compared the bifurcation diagrams between the coupled neurons and single neuron,and found that the coupled neurons had a more complicated bifurcation mode.By increasing the coupling strength,the regular variation of phase differences was illustrated so that asynchronous and some synchronous states could be observed.These synchronous states were also shown in detail by phase portraits and firing series.In addition,we explored the ranges of different synchronous states,which attributed to different ranges of membrane capacitance and coupling strength.