A Shell-Collector's Difficulty

Deposit Collectors?

Informal lending and savings institutions exist around the world, and often include regular door-to-door deposit collection of cash. Some banks have adopted similar services in order to expand access to banking services in areas that lack physical branches. Using a randomized control trial, we investigate determinants of participation in a deposit collection service and evaluate the impact of o...

Colimits for Concurrent Collectors

This case study applies techniques of formal program development by specification refinement and composition to the problem of concurrent garbage collection. The specification formalism is mainly based on declarative programming paradigms, the imperative aspect is dealt with by using monads. We also sketch the use of temporal logic in connection with monadic specifications.

Low Temperature Solar Collectors

Automatic fraction collectors and a conductivity recorder.

In recent years a variety of designs of automatic fraction collectors have appeared (Brimley & Snow, 1949; Cuckow, Harris & Speed, 1949; Edman, 1948; Phillips, 1949; Stein & Moore, 1948). The collectors described here possess the advantages that they are simple and cheap to construct and have given reliable service over long periods. The three machines all operate on the same principle, involvi...

Coherent Data Collectors: A Hardware Perspective

or more than 15 years, the Applied Physics Laboratory has been designing and operating coherent radar data-collection instrumentation. In this article, the engineering challenges and design approaches used to meet analysis requirements are described, examples of collectors are provided, and the nature of future development efforts is outlined. (