Particle composition of high-pressure SF6 plasma with electron temperature greater than gas temperature

Numerical computation was performed to derive particle compositions of high-pressure SF6 plasmas in which the electron temperature Te is greater than the gas temperature T g. The effective excitation temperature Tex for each of particles was proposed to express the distribution of particles in excited states. Furthermore, the relation equations for chemical equilibrium in a two-temperature plasma were developed on the basis of the second law of thermodynamics. At fixed Tg in the range of 6000-9000 K, the increasing Te from 9000-20 000 K encourages the dissociation and ionization of particles, causing the composition of SF6 plasma at 0.1 MPa to differ markedly from the composition under the condition of thermal equilibriu

Deviation from local thermal equilibrium in SF6 post-arc channel exposed to transient recovery voltage

Summary form only given. This paper describes the influence of applied electric field on properties of a SF6 post-arc channel. First, electrical conductivity, enthalpy and mass density of electron and heavy particles in a SF6 plasma were calculated as a functions of Te and Tg. Secondly, using this data, time variations in Te and Tg were computed in an SF6 plasma to which high electric field was applied. The calculated results revealed that applied electric field increased T e and caused deviation from local thermal equilibrium. Finally, time evolution of electrical conductivity σ of SF6 plasma exposed to electric field was also calculated. It was found that σ was enhanced by increasing Te particularly at initial temperature ranges 3000-3500 K and 5500-6500

Dominant spectra of background radiation in an SF6 post-arc channel

Composition of background spectra radiated from a SF6 post-arc channel after current zero was investigated. The radiation intensity of the background spectra at a wavelength of 455 nm around zero current was measured. The post-arc temperature was estimated from the intensity ratio of two spectral lines at 426.0 and 442.7 nm of iron used as an electrode material. The emission coefficients of not only the continuous spectra but also the S2 spectra due to the B3 Σu--X3Σg - transition were theoretically calculated as a function of temperature in the range of 3000-6000 K. The results indicated that the background spectra mainly consist of continuous spectra at temperatures above 4500 K, and of S2 spectra at temperatures below 4500 K. The temperature dependence of the calculated emission coefficients of the background spectra agreed fairly well with that of the measured radiation intensit

Development of a ubiquitous healthcare monitoring system combined with non-conscious and ambulatory physiological measurements and its application to medical care

The demand for ubiquitous healthcare monitoring has been increasingly raised for prevention of lifestyle-related diseases, acute life support or chronic therapies for inpatients and/or outpatients having chronic disorder and home medical care. From these view points, we developed a non-conscious healthcare monitoring system without any attachment of biological sensors and operations of devices, and an ambulatory postural changes and activities monitoring system. Furthermore in this study, in order to investigate those applicability to the ubiquitous healthcare monitoring, we have developed a new healthcare monitoring system combined with the non-conscious and the ambulatory measurements developed by us. In patients with chronic cardiovascular disease or stroke, the daily health conditions such as pulse, respiration, activities and so on, could be continuously measured in the hospital, the rehabilitation room and subject\u27s own home, using the present system. The results demonstrated that the system appears useful for the ubiquitous healthcare monitoring not only at medical facility, but also during daily living at home. © 2011 IEEE

Development of a ubiquitous healthcare monitoring system combined with non-conscious and ambulatory physiological measurements and its application to medical care.

The demand for ubiquitous healthcare monitoring has been increasingly raised for prevention of lifestyle-related diseases, acute life support or chronic therapies for inpatients and/or outpatients having chronic disorder and home medical care. From these view points, we developed a non-conscious healthcare monitoring system without any attachment of biological sensors and operations of devices, and an ambulatory postural changes and activities monitoring system. Furthermore in this study, in order to investigate those applicability to the ubiquitous healthcare monitoring, we have developed a new healthcare monitoring system combined with the non-conscious and the ambulatory measurements developed by us. In patients with chronic cardiovascular disease or stroke, the daily health conditions such as pulse, respiration, activities and so on, could be continuously measured in the hospital, the rehabilitation room and subject\u27s own home, using the present system. The results demonstrated that the system appears useful for the ubiquitous healthcare monitoring not only at medical facility, but also during daily living at home