The thermal debinding of new binder in cemented carbide's extruding compacts and its debinding mechanism have been studied here. When the low molecular mass components (LMMC) in these new binder systems are change...The thermal debinding of new binder in cemented carbide's extruding compacts and its debinding mechanism have been studied here. When the low molecular mass components (LMMC) in these new binder systems are changed, their thermogravimetric analysis (TGA) curves are very different. As the paraffin wax is the main LMMC, the new binder has been removed in two different temperature zones; while the temperature is at 240 ℃, the LMMC have been almost totally debinded. When a kind of short time polymer X is the main LMMC, there are no zones of low temperature debinding in the TGA curves. The differential thermal analysis curves show that a new single phase microstructural material composing with X and polymer A has been made in these cases.展开更多
The behavior of bifurcation and chaos in a forced oscillator containing a square nonlinear term was investigated by using Mel'nikov method and digital computer simulations. It was show that the system blows up for...The behavior of bifurcation and chaos in a forced oscillator containing a square nonlinear term was investigated by using Mel'nikov method and digital computer simulations. It was show that the system blows up for low damping before the motion develops into chaotic one when frequency is locked. The routes which lead to chaos are different for different frequency. After the parameters cross chaotic zone, the response of the system are also different. The three cases all depend on the values of dumping and frequency.展开更多
A theory of EM wave propagation through magnetic multilayers and superlattices is presented based on the propagation matrix of a magnetic film. By using the P matrix, the transmission and reflection coefficients of la...A theory of EM wave propagation through magnetic multilayers and superlattices is presented based on the propagation matrix of a magnetic film. By using the P matrix, the transmission and reflection coefficients of layered magnetic media, including: (l)semi-infinite magnetic surfaces, (2) magnetic multilayers, (3) semi-infinite magnetic superlattices are obtained. The numerical results show that the EM modes of a magnetic layer system is excited and manifested as the sharp dips in the S-polarized reflection and the dispersion curves of the magnetic polaritons can be measured by a method similar to the attenuated total reflection (ATR) technique.展开更多
Let S be a finite linear space, and let G be a group of automorphisms of S. If G is soluble and line-transitive, then for a given k but a finite number of pairs of ( S, G), S has v= pn points and G≤AΓ L(1,pn).
文摘The thermal debinding of new binder in cemented carbide's extruding compacts and its debinding mechanism have been studied here. When the low molecular mass components (LMMC) in these new binder systems are changed, their thermogravimetric analysis (TGA) curves are very different. As the paraffin wax is the main LMMC, the new binder has been removed in two different temperature zones; while the temperature is at 240 ℃, the LMMC have been almost totally debinded. When a kind of short time polymer X is the main LMMC, there are no zones of low temperature debinding in the TGA curves. The differential thermal analysis curves show that a new single phase microstructural material composing with X and polymer A has been made in these cases.
文摘The behavior of bifurcation and chaos in a forced oscillator containing a square nonlinear term was investigated by using Mel'nikov method and digital computer simulations. It was show that the system blows up for low damping before the motion develops into chaotic one when frequency is locked. The routes which lead to chaos are different for different frequency. After the parameters cross chaotic zone, the response of the system are also different. The three cases all depend on the values of dumping and frequency.
基金Supported by the National Natural Science Foundation of China
文摘A theory of EM wave propagation through magnetic multilayers and superlattices is presented based on the propagation matrix of a magnetic film. By using the P matrix, the transmission and reflection coefficients of layered magnetic media, including: (l)semi-infinite magnetic surfaces, (2) magnetic multilayers, (3) semi-infinite magnetic superlattices are obtained. The numerical results show that the EM modes of a magnetic layer system is excited and manifested as the sharp dips in the S-polarized reflection and the dispersion curves of the magnetic polaritons can be measured by a method similar to the attenuated total reflection (ATR) technique.
文摘Let S be a finite linear space, and let G be a group of automorphisms of S. If G is soluble and line-transitive, then for a given k but a finite number of pairs of ( S, G), S has v= pn points and G≤AΓ L(1,pn).
