Variational bounds on the energy dissipation rate in body-forced shear flow

A new variational problem for upper bounds on the rate of energy dissipation in body-forced shear flows is formulated by including a balance parameter in the derivation from the Navier-Stokes equations. The resulting min-max problem is investigated computationally, producing new estimates that quantitatively improve previously obtained rigorous bounds. The results are compared with data from direct numerical simulations.Comment: 15 pages, 7 figure

Is Agribusiness Any Different?

The Viability of Specialized Fields in Agricultural Economics is addressed. The critical question for longevity is, what makes it special? Examples that illustrate how specialties emerge, how they change, and what makes them viable over time is presented. The primary question of: Is Agribusiness Any Different and Is There A Place For It? is set against the background of a need to recognize that Business education today has a high perceived value. Business education today has its focus on analysis. The author believes there is a place for agribusiness if it creates a focus more aligned with what will go on in business.Agribusiness,

ENERGY POLICY ISSUES FOR AGRICULTURE

Resource /Energy Economics and Policy,

DEVELOPING AN ENERGY POLICY EDUCATION PROGRAM

Resource /Energy Economics and Policy,

THE ENERGY TRANSITION: BACKGROUND ON SYNTHETIC FUEL ALTERNATIVES

Resource /Energy Economics and Policy,

ENERGY POLICY WORKSHOP

Resource /Energy Economics and Policy,

BALANCING PRODUCTIVITY AND ENVIRONMENTAL BENEFITS IN THE ENVIRONMENTAL QUALITY INCENTIVE PROGRAM (EQIP)

A concern with productivity has to be tempered with our history of declining real prices for agricultural commodities which signal to some degree a certain amount of excess capacity in agriculture in the United States. Thus, environmental concerns today may logically outweigh productivity concerns. Conservation Programs that preceded the present EQIP program, such as the ACP, often had a productivity component that also was designed to help redistribute income to farmers. In terms of productivity, this may have been as direct as subsidizing the application of lime or the installation of drainage. It may have been more indirect, such as improving damaged lands that could then be returned to production. In any case, some portion of conservation programs was seen as productivity enhancing. This was viewed as a worthwhile public expenditure as was the income transfer that went along with it.Environmental Economics and Policy,

Exponentially growing solutions in homogeneous Rayleigh-Benard convection

It is shown that homogeneous Rayleigh-Benard flow, i.e., Rayleigh-Benard turbulence with periodic boundary conditions in all directions and a volume forcing of the temperature field by a mean gradient, has a family of exact, exponentially growing, separable solutions of the full non-linear system of equations. These solutions are clearly manifest in numerical simulations above a computable critical value of the Rayleigh number. In our numerical simulations they are subject to secondary numerical noise and resolution dependent instabilities that limit their growth to produce statistically steady turbulent transport.Comment: 4 pages, 3 figures, to be published in Phys. Rev. E - rapid communication

Agricultural/Renewable Contributions to U.S. Electricity Usage

Resource /Energy Economics and Policy,