The objective of this work is to study the behavior and sensitivity of ocean acoustic phase arrival times due to sound-speed changes, in comparison to those of peak arrival times. The aim is to derive perturbation relations and sensitivity kernels connecting sound-speed and travel-time perturbations, and, further, to study the behavior of phase arrival times and its predictability, depending on...

In present paper, dynamic behavior and control of a fluidized bed reactor for polyethylene production has been considered. A double active sites model for Ziegler-Natta catalysts is used for simulation of polymerization reaction. Hydrodynamic behavior of the bed is modeled using a two phase model including bubble and emulsion phases in which bubble phase has plug flow pattern with different...

In this study, physical vapor deposition (PVD) Ti-Cr-N coatings were deposited at two different temperatures 100 and 400ºC on hardened and tempered tool steel substrates. The influence of the applied deposition temperature on the physical and mechanical properties of coatings such as roughness, thickness, phase composition, hardness and Young’s modulus were evaluated. Phase compositions were st...

In solution, α-helices are stabilized at the termini by a variety of different capping interactions. Study of these interactions in the gas phase provides a unique means to explore the intrinsic properties that cause this stabilization. Evidence of helical and globular conformations is presented here for gas-phase, doubly charged peptides of sequence XAnK, wherein X is D, N, Q, or L. The relati...

This paper models an economy in which a large number of agents are choosing among several technologies. There is a single, global, market for the technologies but they are subject to localized network externalities in use. We examine the issue of technological standardization, and the coordination of choices among the agents. We generate equilibirum conditions under two spatial conditions|agent...