基于GPRS的PLC自由口模式应用研究

PLC自由口通信模式,可自由定义通信协议,具有良好的通用性,GPRS作为无线信道提供了通信链路,保证了数据通信的实时畅通,这两种技术结合在一起,突显出它相对于传统控制技术的优越性,为工业控制行业实现自动控制提供了一种新的思路。     

The nonlinear mechanism for the same responses of neuronal bursting to opposite self-feedback modulations of autapse

In the traditional viewpoint,inhibitory and excitatory effects always induce opposite responses.In the present study,the enhanced bursting activities induced by excitatory autapses,which are consistent with the recent experimental observations,and those induced by inhibitory autapses,which is a paradoxical phenomenon,were simulated using the Chay model.The same bifurcations and different ionic currents for the same responses were acquired with fast-slow variable dissection and current decomposition,respectively.As the inhibitory or excitatory autaptic conductance increased,the ending phase of the burst related to a homoclinic bifurcation of the fast subsystem changed to widen the burst duration to contain more spikes,which was induced by an elevated minimal potential(V_(min)) of spiking of the fast subsystem.Larger inhibitory and excitatory autaptic conductances induced smaller and larger maximal potentials(V_(max)) of spiking,respectively.During the downstroke,a weaker potassium current induced by the smaller V_(max) played a dominant role for the inhibitory autapse,and the stronger potassium current induced by the larger V_(max) became weaker due to the opposite autaptic current of the excitatory autapse,which induced the V_(min) elevated.The results present the nonlinear and biophysical mechanisms of the same responses to opposite effects,which extends nonlinear dynamics knowledge and provides potential modulation measures for the nervous system.     

地源热泵技术的研究与应用现状

阐述了地源热泵系统的结构原理，着重介绍了地源热泵技术在国内外的研究现状，并分析了有关该系统的一些技术问题。尽管地源热泵系统仍存在一定缺陷，但其在节能和环保方面有着明显的优势，可以断言地源热泵系统在我国将有广泛的应用前景。