In one proposed use of digital watermarks, the owner of a document D sells slightly diierent documents, D 1 ; D 2 ; : : : to each buyer; if a buyer posts his/her document D i to the web, the owner can identify the source of the leak. More general attacks are however possible in which k buyers create some composite document D ; the goal of the owner is to identify at least one of the conspirator...

ACKNOWLEDGEMENTS While working on my Ph.D. at Georgia Tech and Michigan, I have received a great deal of support from many different people. My degree would not have been possible without this support. I would like to begin by thanking my two dissertation advisors, Dr. Ozlem Ergun and Dr. Chip White. Their guidance and encouragement was constant and unwavering. They helped open the door for me ...

A cold-flow lab-scale cross-flow fluidized bed classifier was simulated using the CFD software Barracuda VR®. The purpose of study to identify most suitable drag model and make adjustments that provide best representation flow situation in when comparing results with experimental data. Two particle types were used simulations experiments: zirconia (median diameter 69 µm, skeletal density 3830 k...

The pressure gradient and the static and the dynamic hold-up have been measured for a system consisting ofa Fluid Cracking Catalyst (FCC) of 30-150 x 10m6 m diameter, trickling over a packed bed and with a gas streaming in countercurrent flow. The experiments were carried out at ambient conditions using a glass column of 25 x 10 ~’ m diameter. The packing material consisted of 8 x 8 x 3 mm cera...

An experimental study is conducted to determine the effect of different types of nanoparticles on the gas fluidization characteristics of nanoparticle agglomerates. Taking advantage of the extremely high porosity of the bed, optical techniques are used to visualize the flow behavior, as well as to measure the sizes of the fluidized nanoparticle agglomerates at the bed surface. Upon fluidizing 1...

Low-carbon operation technologies of the blast furnace (BF) are crucial for reducing carbon dioxide emissions from steelmaking industry. The variation characteristic permeability and structure in a BF lumpy zone has critical impact on achieving low-carbon operations. Still, their influences have not been fully understood, related studies very limited. To solve problem deteriorating furnaces aft...