The futures market for farm commodities - what it can mean to farmers

Farm income ; Agricultural prices

Pitfalls to the current expansion

Economic conditions

Housing: a cyclical industry on the upswing

Housing

Rising farmland prices and falling farm earnings: is agriculture in trouble?

Agriculture ; Farm income

A mortgage futures market: its development, uses, benefits, and costs

Mortgages

Government debt financing - its effects in view of tax discounting

Debts, Public ; Fiscal policy

Ion-retarding lens improves the abundance sensitivity of tandem mass spectrometers

Ion-retarding lens which increases the abundance sensitivity of tandem magnetic-analyzer mass spectrometers measures isotopes of low abundance in mass positions adjacent to isotopes of high abundance. The lens increases the abundance sensitivity for isotopes lying farther from high abundance isotopes than the energy cutoff of the lens

A global low order spectral model designed for climate sensitivity studies

A two level, global, spectral model using pressure as a vertical coordinate is developed. The system of equations describing the model is nonlinear and quasi-geostrophic. A moisture budget is calculated in the lower layer only with moist convective adjustment between the two layers. The mechanical forcing of topography is introduced as a lower boundary vertical velocity. Solar forcing is specified assuming a daily mean zenith angle. On land and sea ice surfaces a steady state thermal energy equation is solved to calculate the surface temperature. Over the oceans the sea surface temperatures are prescribed from the climatological average of January. The model is integrated to simulate the January climate