The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors...The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors, such as electric field strength and particle concentration, were detected. By use of rare earth as agent to dope the samples, the experimental results show that, with the increasing of field strength and particle concentration, ER effect changes.展开更多
Using correlated data from thirty Chinese provinces for the years between 2000-2009, this paper examines the impact of FDI spillover and environmental regulation on the progress of industrial technology in China as we...Using correlated data from thirty Chinese provinces for the years between 2000-2009, this paper examines the impact of FDI spillover and environmental regulation on the progress of industrial technology in China as well as the impact of environmental regulation on the marginal effect of FDI. Empirical results show that while FDI spillover has a negative effect, enhanced environmental regulation has a positive effect. Environmental regulation also has a significant impact on the marginal effect of FDI spillover on industrial technology development. Separate studies on state-owned and private enterprises suggest that environmental regulation has a heterogeneous effect on industrial technology progress and the marginal effect of FDI spillover on industrial technology progress.展开更多
In this paper, we study the dynamics of a diffusive modified Leslie-Cower model with the multiplicative Allee effect and Ba^zykin functional response. We give detailed study on the stability of equilibria. Non-existen...In this paper, we study the dynamics of a diffusive modified Leslie-Cower model with the multiplicative Allee effect and Ba^zykin functional response. We give detailed study on the stability of equilibria. Non-existence of non-constant positive steady state solutions are shown to identify the rage of parameters of spatial pattern formation. We also give the conditions of Turing instability and perform a series of numerical simulations and find that the model exhibits complex patterns.展开更多
Dynamic nuclear polarization （DNP） has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance （NMR） of various molecules. Liquid-state D...Dynamic nuclear polarization （DNP） has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance （NMR） of various molecules. Liquid-state DNP based on Overhauser effect is capable of directly enhancing polarization of all kinds of nuclei in the system. The combination of simultaneous Overhauser multi-nuclei enhancements with the multi-nuclei parallel acquisitions provides a variety of important applications in both MR spectroscopy （MRS） and image （MRI）. Here we present two simple illustrative examples for simultaneously enhanced multi-nuclear spectra and images to demonstrate the principle and superiority. We have observed very large simultaneous DNP enhancements for different nuclei, such as XH and 23Na, 1H and 31p, 19F and 31p, especially for the first time to report sodium ion enhancement in liquid. We have also obtained the simultaneous images of 19H and 31p, 19F and 31p at low field by solution-state DNP for the first time.展开更多
文摘The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors, such as electric field strength and particle concentration, were detected. By use of rare earth as agent to dope the samples, the experimental results show that, with the increasing of field strength and particle concentration, ER effect changes.
文摘Using correlated data from thirty Chinese provinces for the years between 2000-2009, this paper examines the impact of FDI spillover and environmental regulation on the progress of industrial technology in China as well as the impact of environmental regulation on the marginal effect of FDI. Empirical results show that while FDI spillover has a negative effect, enhanced environmental regulation has a positive effect. Environmental regulation also has a significant impact on the marginal effect of FDI spillover on industrial technology development. Separate studies on state-owned and private enterprises suggest that environmental regulation has a heterogeneous effect on industrial technology progress and the marginal effect of FDI spillover on industrial technology progress.
文摘In this paper, we study the dynamics of a diffusive modified Leslie-Cower model with the multiplicative Allee effect and Ba^zykin functional response. We give detailed study on the stability of equilibria. Non-existence of non-constant positive steady state solutions are shown to identify the rage of parameters of spatial pattern formation. We also give the conditions of Turing instability and perform a series of numerical simulations and find that the model exhibits complex patterns.
基金supported by the Chinese Academy of Sciences(ZDYZ2010-2)the Ministry of Science and Technology of China (2011YQ120035)the National Natural Science Foundation of China (11405264,11274347,21221064,11575287)
文摘Dynamic nuclear polarization （DNP） has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance （NMR） of various molecules. Liquid-state DNP based on Overhauser effect is capable of directly enhancing polarization of all kinds of nuclei in the system. The combination of simultaneous Overhauser multi-nuclei enhancements with the multi-nuclei parallel acquisitions provides a variety of important applications in both MR spectroscopy （MRS） and image （MRI）. Here we present two simple illustrative examples for simultaneously enhanced multi-nuclear spectra and images to demonstrate the principle and superiority. We have observed very large simultaneous DNP enhancements for different nuclei, such as XH and 23Na, 1H and 31p, 19F and 31p, especially for the first time to report sodium ion enhancement in liquid. We have also obtained the simultaneous images of 19H and 31p, 19F and 31p at low field by solution-state DNP for the first time.
