This paper describes a solar powered reciprocating engine based on the use of a tethered hot air balloon fuelled by hot air from a glazed collector. The basic theory of the balloon engine is derived and used to predict the performance of engines in the 10kW to 1MW range. The engine can operate...

This paper examines the estimation of the economic costs of hydrologic data collection using the concept of opportunity cost. The opportunity cost of operating a hydrologic data collection network is equal to the maximum value the resources used in its operation would have if they were free to...

The generalized mean value (GMV) function, defined as GN(p)=(ΔN(p))1/p(where ΔN(p) is the absolute value of the moment of the pth order), was used here to differentiate between statistically close random sequences or those sequences containing large numbers of measured points (N⪢1). The...

This paper studies the impact of U.S. immigration barriers on global knowledge production. We present four key findings. First, among Nobel Prize winners and Fields Medalists, migrants to the U.S. play a central role in the global knowledge network – representing 20-33% of the frontier...

This study examines the nature of the interaction of banks and community development financial institutions (CDFIs) in small business lending. We examine the experience of six different CDFIs that vary by size, corporate structure, and market. We explore how they both collaborate and compete...