Switchable ionic compounds have wide applications in chemical processes.A switchable ionic compound based on 1,8-diazabicyclo-[5.4.0]-undec-7-ene(DBU),CH_3OH and CO_2 was synthesized and characterized.DBU/CH_3OH/CO_2 ...Switchable ionic compounds have wide applications in chemical processes.A switchable ionic compound based on 1,8-diazabicyclo-[5.4.0]-undec-7-ene(DBU),CH_3OH and CO_2 was synthesized and characterized.DBU/CH_3OH/CO_2 ionic compound was prepared in the presence of excess methanol,and then the excess methanol was removed by reduced pressure distillation in CO_2 atmosphere.The product yield(100%) reached the theoretical maximum for the first time.Its structure was identified by NMR,FT-IR,and XRD.The crystal product shows 8strong peaks in XRD at 2θ values of 16.0547°,16.4308°,16.7651°,18.8714°,19.2140°,21.9471°,22.0780°,and25.5661°.Its decomposition onset temperature(53 ℃) was affirmed by TGA,which is lower than its melting point.And its ionic switch point was measured by conductivity.展开更多
The effects of noise and a periodic signal on a synthetic gene network have been investigated. By tuning the distance of a parameter from the Hopf bifurcation point, both implicit internal signal stochastic resonance ...The effects of noise and a periodic signal on a synthetic gene network have been investigated. By tuning the distance of a parameter from the Hopf bifurcation point, both implicit internal signal stochastic resonance and explicit internal signal stochastic resonance can be induced by noise. Furthermore, a switch process can also be elicited. When a periodic signal is coupled to the gene network, two interesting phenomena occur with the modulation of the frequency of the signal: the effect of noise amplifying cellular signal can be inhibited or even destroyed, and "locked" coherence resonance occurs.展开更多
基金Supported by the Doctoral Fund of Ministry of Education of China(20130181130006)the Key Program of National Natural Science Foundation of China(21336008)the National Natural Science Foundation of China(21476150)
文摘Switchable ionic compounds have wide applications in chemical processes.A switchable ionic compound based on 1,8-diazabicyclo-[5.4.0]-undec-7-ene(DBU),CH_3OH and CO_2 was synthesized and characterized.DBU/CH_3OH/CO_2 ionic compound was prepared in the presence of excess methanol,and then the excess methanol was removed by reduced pressure distillation in CO_2 atmosphere.The product yield(100%) reached the theoretical maximum for the first time.Its structure was identified by NMR,FT-IR,and XRD.The crystal product shows 8strong peaks in XRD at 2θ values of 16.0547°,16.4308°,16.7651°,18.8714°,19.2140°,21.9471°,22.0780°,and25.5661°.Its decomposition onset temperature(53 ℃) was affirmed by TGA,which is lower than its melting point.And its ionic switch point was measured by conductivity.
基金supported by the National Natural Science Foundation of China (20905009 and 21003010)the Logistics Management & Engineering Platform of Beijing Area Logistics System & Technology Major Laboratory, and Excellent Young Scholars Research Fund of Beijing Institute of Technology (2009 Y1017)
文摘The effects of noise and a periodic signal on a synthetic gene network have been investigated. By tuning the distance of a parameter from the Hopf bifurcation point, both implicit internal signal stochastic resonance and explicit internal signal stochastic resonance can be induced by noise. Furthermore, a switch process can also be elicited. When a periodic signal is coupled to the gene network, two interesting phenomena occur with the modulation of the frequency of the signal: the effect of noise amplifying cellular signal can be inhibited or even destroyed, and "locked" coherence resonance occurs.
