asphaltenes are the n-pentane or n-heptane insoluble fractions of crude oil that remain in solution under reservoir temperature and pressure conditions. they are destabilized and start to precipitate when the pressure, temperature and/or composition changes occur during primary production. the precipitated asphaltene particles will then grow in size and may start to deposit onto the production ...

– User-cost indexes provide important information about the welfare implications of durable goods purchases. In this paper indexes for the cost of private transportation are developed, based on the costs associated with using new passenger cars sold in 1992-1999, in the Netherlands. These user costs consist of both fixed costs such as economic depreciation, and operating costs such as fuel cons...

ethylene was homopolymerized over ziegler-natta catalyst and the homopolymerization was modeled using moment equations. mechanism was modeled according to five different reaction centers of catalyst. for each center, there are different reaction rate coefficients; therefore the final product of each center would be expected to be different. modeling results showed good conformity to the experim...

We consider charge transport for interacting many-body systems with a gapped ground state subspace that is finitely degenerate and topologically ordered. To any locality-preserving, charge-conserving unitary preserves the space, we associate an index integer multiple of 1/p, where p degeneracy. prove additive under composition unitaries. This formalism gives rise to several applications: fracti...

A successful entrepreneur, Schultz co-founded the Mesa Group, Inc. in 1988, where he served as chairman and CEO for nearly ten years. During his tenure, he led the company to several years of growth, resulting in successful acquisition by Microsoft in 1998. Schultz also co-founded Blossom Software, a company that developed, marketed and supported software products to enhance Lotus 1-2-3. Prior ...