The liquid sintering characteristics have been studied in the sintered compacts of short cast iron fibers added with Ni-Cr based alloy powder at the sintering temperature of 1100 degrees C. With the increase of Ni-Cr ...The liquid sintering characteristics have been studied in the sintered compacts of short cast iron fibers added with Ni-Cr based alloy powder at the sintering temperature of 1100 degrees C. With the increase of Ni-Cr based alloy content, the microstructure of sintered compact of short cast iron fibers transformed from pearlite + ferrite to martensite + austenite, meanwhile volume expansion appeared in the sintered compact, leading to more pores. The proper addition of P-Fe powder could restrain the expansion of the sintered compact and increase the strength and hardness of the sintered compact.展开更多
MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specifi...MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specific properties in electricity, light, magnetism and mechanics as well as their high interfacial density. In many applications, one has to consider the effects arising from microstructure. If the thickness of sublayers is very small (several nanometers),multilayers may exhibit a dimensional periodic structure (modulation structure) in the展开更多
C-N thin films have been prepared by ion beam sputtering using pure N-2 as discharge gas. The ratio N/C of the films measured by Auger spectrum is 20% on an average. The results of X-ray diffraction and transmission e...C-N thin films have been prepared by ion beam sputtering using pure N-2 as discharge gas. The ratio N/C of the films measured by Auger spectrum is 20% on an average. The results of X-ray diffraction and transmission electron microscopy show that beta-C3N4. phase exists in the films. X-ray photoelectron spectroscopy shows that nitrogen is mostly combined with carbon with triple (C=N) and double (C=N) bonds. The IR absorption shows an absorption bond near 2185 cm(-1) assigned to the C=N, no trace of C-C bond was observed.展开更多
A new special property of DNA was found. It can remarkably catalyze the electrooxidation of catecholamine neurotransmitters. The electrocatalytic activity of DNA towards catecholamine neurotransmitters can be attribut...A new special property of DNA was found. It can remarkably catalyze the electrooxidation of catecholamine neurotransmitters. The electrocatalytic activity of DNA towards catecholamine neurotransmitters can be attributed to the interaction between DNA and the neurotransmitters.展开更多
文摘The liquid sintering characteristics have been studied in the sintered compacts of short cast iron fibers added with Ni-Cr based alloy powder at the sintering temperature of 1100 degrees C. With the increase of Ni-Cr based alloy content, the microstructure of sintered compact of short cast iron fibers transformed from pearlite + ferrite to martensite + austenite, meanwhile volume expansion appeared in the sintered compact, leading to more pores. The proper addition of P-Fe powder could restrain the expansion of the sintered compact and increase the strength and hardness of the sintered compact.
文摘MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specific properties in electricity, light, magnetism and mechanics as well as their high interfacial density. In many applications, one has to consider the effects arising from microstructure. If the thickness of sublayers is very small (several nanometers),multilayers may exhibit a dimensional periodic structure (modulation structure) in the
文摘C-N thin films have been prepared by ion beam sputtering using pure N-2 as discharge gas. The ratio N/C of the films measured by Auger spectrum is 20% on an average. The results of X-ray diffraction and transmission electron microscopy show that beta-C3N4. phase exists in the films. X-ray photoelectron spectroscopy shows that nitrogen is mostly combined with carbon with triple (C=N) and double (C=N) bonds. The IR absorption shows an absorption bond near 2185 cm(-1) assigned to the C=N, no trace of C-C bond was observed.
文摘A new special property of DNA was found. It can remarkably catalyze the electrooxidation of catecholamine neurotransmitters. The electrocatalytic activity of DNA towards catecholamine neurotransmitters can be attributed to the interaction between DNA and the neurotransmitters.
