A novel magnetic alumina aerogel was evaluated for F− removal from water. It is an effective and easily prepared adsorbent with moderate cost that operates in a magnetic separation-enhanced sequencing batch mode which fully benefits from the fast kinetics of fine powders.
Nanosized tungsten powders were fabricated by solution combustion synthesis combined with hydrogen reduction. The powder had a size of 20 nm but possessed a large numbers of lattice defects. The fracture surface images at different temperatures show that the as-synthesized tungsten powder could be sintered via a pressureless process to relative density up to 95.78% at 1773 K. Kinetic analysis suggests that grain-boundary diffusion is one of the primary mechanisms of mass transport during the intermediate stage of sintering. The sintering properties are attributed to the ultrafine grain and the high sintering activation caused by the effect of the solution combustion synthesis method. It reveals in detail that the as-synthesized tungsten powder has a lower sintering activation energy compared to commercial nanosized tungsten powder, with a measured hardness of 633 HV.
As the improvement of the requirements of Military Information Security, information hiding technology will become an important method in defence of information security. Based on the basic definition and principles of information hiding technology, DCT transfer based on MATLAB is introduced to analyze the application of image hiding technology in military field. According to the simulation results, the need of information hiding technology in Military Information Security is analyzed. On the basis of the need, the application scope of information hiding technology in Military Information Security is illuminated and some issues that should be concerned in application are given at the end.
The mechanism that hydrated lime can improve water stability of asphalt mixture was analyzed through contrasting the performance of hydrated lime and ordinary limestone ore filler. The test results indicated that hydrated lime can obviously improve the water stability of asphalt mixture.
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