"Digested sludge lagoons were originally considered temporary sludge storage devices; however, it was found that with prolonged storage a lagoon became an effective drying unit. Since they provide one of the more economical ...

This paper proposes a direct synthesis procedure for the design of sampled-data systems using the z-transformation method. This procedure can be summarized as follows: 1. By methods set forth in the literature the pole-zero ...

"The overhead projector has been used as a teaching aid for several years, in elementary education and in engineering drawing. No use of an overhead projector in kinematics has been reported, nor has there been a statistical evaluation of its...

"In the current literature, two different approaches to sampled-data theory prevail. One approach emphasizes the z-transformation methods for design and synthesis. The other approach emphasizes the Laplace transformation ...

"The elastic modulus of concrete is an important parameter in reinforced concrete design and analysis. With the increased use of lightweight aggregates for structural concrete a better understanding of the relationship ...

"To determine the potential of a spacecraft, an electric field meter is needed to measure the field at the surface and in the neighborhood of the craft. A search was made for field measuring methods which would not involve ...

"This paper presents the procedures used and the results obtained in a series of static load tests designed to study the mechanism of load transfer between adjacent precast bridge-slab sections. These tests were undertaken as one phase of a general...

"The equivalent circuit is a familiar tool to power system engineers. Today's large interconnected power systems often are studied as electric networks in which part of the network is a simplified equivalent of the actual system. Such equivalents...

"A method is presented for post-tensioned reinforced concrete structures whereby the effect of cable tension can be expressed as a distributed or concentrated load. The analysis thus becomes a simple matter of applying ...

The mutual impedance of two coupled linear antennas is needed to obtain the radiation impedance of an array of linear antennas and to determine the effect of one antenna upon a neighboring antenna, for example, the effect ...

"Probe coils are useful in determining the properties of metals on which the coil is placed. An analysis and an equivalent circuit of the coil on a metal surface are needed and are presented here. The coil was assumed to ...

The study described was propounded to determine if it is possible to provide a biophysical driving force that will stimulate the operator in repetitive tasks to work at a rhythm that is comfortable, yet more productive ...

"The viscosity of a suspension is related to the properties of the suspending liquid and the suspended particles by measuring the viscosity of suspensions made up of closely sized materials such as glass spheres, plastic ...