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With the pace of urbanization continues to accelerate, making underground construction area is growing. More and more large underground public buildings are located in the ground, such as shopping malls, subways and so on. The fire evacuation in a large underground building has more difficulty than on the ground. In order to gain more time for evacuation, smoke design of large underground public buildings...
This paper mainly does a research on force and thermal phenomena of short circuited melted mark in electrical fire. The primary short circuited melted mark and secondary short circuited melted mark were prepared by the experiment, and were characterized by metallographic microscope, powder X-ray diffraction, scanning electron microscope and energy dispersive spectroscopy, the role of forces and heat...
A thermo chromic materials named Salicylaldehyde ethanolamine Schiff base was synthesized with ethanolamine and salicylaldehayde derivative in the medium of ethanol, and was characterized by means of UV-Vis absorption, GCMS. The reaction kinetics of Schiff base production was investigated through UV-Vis absorption spectra, and also the thermochromism of Schiff Base Condensed from ethanolamine and...
In a high humidity environment, the composite insulating material will absorb moisture from the air, the dielectric properties of the material may change consequently, thus accelerating degradation of mechanical and insulating properties. High-temperature vulcanized (HTV) silicone rubber, commonly used as composite insulators shed and housing materials, has been investigated for their moisture absorption...
We study theoretically the spin polarized electron field emission from carbon nanotube (CN) within an axial magnetic field. It is found that the spin polarization of emission current can reach 0.05~0.08 with 0.1~1 μA emission current in the magnetic field 6 T and the electric field 9~12 V/nm at room temperature. The spin polarizations of the energy distributions oscillate and the peaks reach to 0...
Tacit knowledge exists in knowledge main-bodies of different hierarchy in enterprise. To enable full sharing and improve core competitiveness, incentive models of knowledge sharing for knowledge main-bodies of different hierarchy should be established; According to principal- agency theory, and taking into account incomplete information of knowledge sharing, multi-stages incentive model of knowledge...
Carbon nanotubes (CN) exhibit not only experimentally excellent field-emission features, low threshold field, high current density and thermal stability, but also the current-voltage (I-V) characteristic deviates from the Fowler-Nordheim (FN) type behavior at high current density, which induces theoretical interesting to understand new physics in CN field emission. In principle, the energy band structure...
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