PubMed · 5650943
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K Feige. 1968. How electronic "noise" affects instruments.. https://pubmed.ncbi.nlm.nih.gov/5650943/
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Resolution of high molecular weight proteins, in the upper region of polyacrylamide gels, was studied in relation to the type of electric field. Separations by constant field gel electrophoresis (CFGE) were compared to those in pulsed oscillatory high-performance electrophoresis (POPE), a novel technique which allows electrophoresis at high field strengths owing to a novel local field distribution. This distribution contributes to structural and mechanical stability of the gel with resultant well-reproducible separation, enhanced resolution, and higher absolute mobility of proteins in POPE.
Knowledge of the point spread function (PSF) of an imaging system is important when studying the characteristics of the blur present in the images. Published experimental PSF identification techniques adapt classical one-dimensional linear system identification strategies using impulse, step function or periodic input signals. This study proposes and successfully applies a correlation method based on the Wiener-Hopf equation to identify the PSF of a CT scanner. The input consists of a series of pseudorandomly located holes. Results are found to be statistically equivalent to those obtained with the impulse method at a 90% two-sided confidence interval. Like the impulse method, it readily yields two-dimensional estimate, but the larger input circumvents the major objection to the use of a wire input. Furthermore, it is relatively immune to output noise, offering an advantage over edge methods. This resistance to noise may prove helpful for nuclear medicine imaging techniques, for which the signal-to-noise ratio is much lower than that X-ray for CT.
Sensitivity to the environment is one of the pleasures of life. Unfortunately, for certain individuals this gets out of control. They become hypersensitive to something around them: pollens, moulds, man-made chemicals or to certain foods or drinks. If this is allowed to develop, sensitivity to the electrical environment may also appear as a part of the overall package of sensitivities. The same symptoms will then appear when the individual is in proximity to computers, televisions, telephones, supermarket check-outs, fluorescent lighting and even weather fronts and sunlight. The author has been involved in the diagnosis and treatment of electromagnetic sensitivities with complementary therapy since 1982, and considers here the nursing problems these patients present.