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On February 2006, President George W. Bush said, "All of a sudden, you know, we may be in the energy business by being able to grow grass on the ranch and have it harvested and converted into energy." Analyze and compare two of the following options:
1. Surveying the technical literature on the topic, we find an article by Schmer et al. [20]. According to this article, the net energy yield of switchgrass grown over 5 years on marginal crop land on farms in the mid-continental United States was 60 GJ/ha. This is equivalent to about 0.2 W/m2, about 10 times the bioethanol from corn in the United States, and represents a potential source of ethanol sometime in the future.
2. Bioethanol can also be produced from sugarcane in climates such as in Brazil. For sugarcane, the production is 80 ton/ha.
3. Ethanol from corn using technology of 2009.
1. The mechanical properties of cobalt may be improved by incorporating fine particles of tungsten carbide (WC). Given that the mod- uli of elasticity of these materials are, respec- tively, 200 GPa (30 x 106 psi) and 700 GPa
The maximum permissible force that can be transmitted to the floor is 8000 N and the only type of isolator available has a stiffness of 1 MN/m and a damping ratio of 5 percent. Investigate possible solutions to the problem.
Determine the evaporator and condenser pressures, each in lbf/in.2, the mass flow rate of refrigerant, in lb/min, the compressor power input, in horsepower, and the coefficient of performance for (a) Refrigerant 134a and (b) ..
the two blocks in the figureoscillate on a frictionless surface with a period of 1.7 s. the upper block just begins to
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Determine the torque at the motor-turbine shaft and the total power delivered to the turbine. What is the total power consumed by the motor?
A RTD has an output impedance of 500 Ω. If the loading error has to be maintained near 5%, estimate a suitable value for the load impedance.
if an automobiles braking distance from 60 mph is 150 ft on level pavement determine the automobiles braking distance
block b has a mass m and is released from rest when it is on top of cart a which has a mass of 3m. determine the
Determine the pseudo inverse A† without using the SVD.
Determine i1(t) for t > 0 for a constant applied voltage E0 = 10 V.
select a steel for use in high-pressure cylindrical containment vessels for the next generation of nuclear submarines.
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