High Electromagnetic Field Research Articles

Overview of Containerless Processing Technologies

ABSTRACTIn the near future, a large segment of the scientific community will have an opportunity to perform materials processing experiments on the Space Shuttle in the reduced gravity environment of space. Many of these experiments will require containerless processing techniques that provide manipulation and control of weightless (molten) materials without physical contact with container walls or other holding devices. A variety of containerless processing technologies are now being developed for space and ground-based materials processing facilities. The utilization of air jets or high intensity acoustic, electromagnetic or electrostatic fields can produce forces that support and manipulate materials. Most of the present containerless research is directed toward the development of high temperature systems capable of melting and resolidifying materials. This paper will review the materials processing capabilities and level of developmental progress of each technique. An introduction to available NASA test facilities will also be given.

Regulating possible health effects from AC transmission line electromagnetic fields

Available experimental evidence on possible human health effects from exposure to high voltage ac transmission line electromagnetic fields is contradictory and inconclusive. Yet, in several states, growing public concern is regulatory action. A number of alternative technologies are available to control human exposure to these fields. This paper looks briefly at the available evidence on health effects, estimates the costs of possible control technologies, and then performs an analysis to bound the region of appropriate control strategies for electric field exposures for representative 500 and 765-kV ac transmission lines. Results are presented parametrically in the key variables. Both the value and the potential societal costs of the analytical approach we take are discussed.

Real-Time Central Data Acquisition and Analysis System for High-Voltage Transients

A system has been developed for ultra-high-speed digital recording and analysis of transient phenomena. It enables one to look back in time, recording signals that occur prior to single events which have statistical uncertainties of occurrence, such as lightning or breakdown phenomena. The system as installed is playing an essential role in studying cause-effect relationships through the acquisition and analysis of data. Data are received in an asynchronous fashion in real and stored in a cartridge disk through Transient Recorders (Biomation Model 8100) and minicomputer (Melcom-70, Japan). The system is time-shared and digital-controlled by multiple users from remote consoles located at nine test stations. The stored data are retrieved and analyzed with highest time availability priority to get processed information through correlation, statistical analysis or various computer-aided simulations. Special precautions have been taken against high energy electromagnetic noise fields, such as grounding, shielding, etc., in order to attain noise-proof operation. Principles of operation, major components, and examples of the application of the system are presented.

Plasma Confining Effect of High Frequency Multi-Pole Electromagnetic Field

Plasma Confining Effect of High Frequency Multi-Pole Electromagnetic Field

The behavior of unicellular organisms in an electromagnetic field

1. 1. Unicellular organisms reacted in a variety of ways to high frequency, high voltage electromagnetic fields. 2. 2. Non-motile organisms aligned parallel to the lines of force at frequencies in the lower megacycle range and some of them at right angles to the lines of force at higher frequencies. 3. 3. No non-viable matter has been noted to orient at right angles to the lines of force. They have always aligned parallel to the field and formed chains. 4. 4. Motile microorganisms were constrained to travel only parallel to the field at lower frequencies and at right angles to the lines of force at higher frequencies. 5. 5. Intracellular structures were affected by appropriate selective frequencies. 6. 6. Other phenomena of the behavior of cells and groups of different organisms in electromagnetic fields are described.