In this chapter, basic concepts involved in luminescencewill be discussed.Wewill take a closer look at a number of excitation mechanisms which are involved in generating luminescence and processes which lead to luminescence, taking illustrative examples from luminescentmaterials applied in fluorescent lamps and cathode ray tubes.With respect to fluorescent lamps, we will restrict ourselves to d...

Introduction The full hermetic package for electronics and optoelectronic (OE) devices was first developed in the 1800’s and has served these industries well. The earliest optoelectronic devices, cathode ray tubes (CRT) demonstrated in the late 1800’s, used a sealed glass vacuum enclosure. The Braun Tube, for example, was a scanning CRT display system that used a glass envelope to seal out the ...

Human epileptic photosensitivity has been studied in several ways. (a) Visual stimulation that resembles the stimulation normally responsible for seizures, such as that from televisions or videogames, both of which typically use cathode ray tubes in which the display is created in a flickering pattern. Such stimulation is often rendered yet more epileptogenic by programmes with content that als...

To reduce the effects of extraneous potentials caused by muscle tremor, sweating, and interference from power circuits, it is desirable to restrict the frequency range of the cathode ray vectorcardiograph. Mathematical analysis of idealized waves and experiments with a photoelectric electrocardiographic generator indicate that a frequency range between the half-power frequency of 0.8 to 80 cycl...

The functional structure of the mechanism underlying the perception of motion and its processing by the central nervous system has thus far been analysed in the beetle Clorophanuswn<£r(Hassen9tein& Reichardt, i956;Reichardt&Varju, 1959; Reichardt, 1962), in the fly Musca domestica (Hertz, 1934a; Fermi & Reichardt, 1963; McCann & McGinitie, 1965; Bishop & Keehn, 1967) and in other compound-eye a...

Yeast cells of Candida albicans which had been attached to polylysine-coated microscope slides were induced to form buds or germ tubes in the presence of external electrical fields. The sites of budding and germ tube formation and the growth of germ tubes and hyphal branches were polarized preferentially towards the cathode. Buds were not converted to pseudohyphae or germ tubes by the field and...

The performance of clinical analyz-ers is commonly assessed under a variety of environmental conditions to set acceptable limits (e.g., temperature and humidity) for operation. We recently faced an unusual environmental challenge within our automation laboratory, namely a variable magnetic field emanating from a Niobe௡ Magnetic Navigation System (Stereotaxis; http:// www.stereotaxis.com) being ...

In almost all of the recent vision experiments, stimuli are controlled via computers and presented on display devices such as cathode ray tubes (CRTs). Display characterization is a necessary procedure for such computer-aided vision experiments. The standard display characterization called "gamma correction" and the following linear color transformation procedure are established for CRT display...

Flat-panel displays, especially liquid crystal displays (LCDs), are now firmly established as important devices for information displays. But do LCDs assure better readability than cathode-ray tubes (CRTs)? We carried out an experiment using four types of displays: negative and positive CRTs, and LCDs with and without backlighting. A syllable-checking task using the Japanese katakana alphabet w...