PubMed · 13969928
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
M A BEAN, F A KRAHN, B L ANDERSON, M T YOSHIDA. 1963. Monitoring patients through electronics.. https://pubmed.ncbi.nlm.nih.gov/13969928/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
The proper management of discarded electronic devices (E-waste) is an important issue for solid waste professionals because of the magnitude of the waste stream and because these devices often contain a variety of toxic metals (e.g., lead). While recycling of E-waste is developing, much of this waste stream is disposed in landfills. Leaching tests are frequently used to characterize the potential of a solid waste to leach when disposed in a landfill. In the United States, the Toxicity Characteristic Leaching Procedure (TCLP) is used to determine whether a solid waste is a hazardous waste by the toxicity characteristic. The TCLP is designed to simulate worse-case leaching in a landfill environment where the waste is co-disposed with municipal solid waste (MSW). While the TCLP is a required analysis from a regulatory perspective, the leachate concentrations measured may not accurately reflect the concentrations observed under typical landfill conditions. Another method that can be performed to assess the degree a pollutant might leach from a waste in a landfill is to use actual landfill leachate as the leaching solution. In this study, two lead-containing components found in electronic devices (printed wire boards from computers and cathode ray tubes from computers and televisions) were leached using the TCLP and leachates from 11 Florida landfills. California's Waste Extraction Test (WET) and the Synthetic Precipitation Leaching Procedure were also performed. The results indicated that the extractions using MSW landfill leachates resulted in lower lead concentrations than those by the TCLP. The pH of the leaching solution and the ability of the organic acids in the TCLP and WET to complex with the lead are factors that regulate the amount of lead leached.
The kinetics of pyrolysis of electronic packaging material are investigated under various heating rates (5, 10, 15, 20 K/min) in an inert atmosphere using a thermogravimetric analysis (TGA) technique. The pyrolysis characteristics of samples are examined by SEM, XRD, FTIR, ICP-MS and EA. The effect of heating condition on the surface area and pore structure of samples is discussed. Two reaction stages are involved for the pyrolysis of electronic packaging material when nitrogen is present in the carrier gas. The corresponding kinetic parameters, including activation energy, pre-exponential factor and reaction order are presented. The apparent activation energies can be divided into three groups. The results will be useful in developing pyrolysis or incineration systems for plastic waste from electronic components.
PURPOSE: We are concerned with aiding the mobility of visually impaired travellers around often complex and unfamiliar internal and urban environments. To do this we focus on a users interaction with ambient devices because these device types provide an easy entry point for visually impaired individuals to interact with their surroundings. By augmenting the physical environment with mobility focused ambient devices and making existing devices universally accessible our goal of easy, focused, and confident mobility can be achieved. METHOD: We identify, through paper reviews and studies of empirical and anecdotal evidence, the social and technical problems that have so far barred consistent and cohesive development of an ambient mobility-network. RESULTS: We suggest that multi-model sensory-interaction with objects and assistive devices within an environment is the only way to accomplish easy, focused, and confident mobility for visually impaired travellers. We find that universal access to ambient devices does not exist when the user interface and the device functionality are conjoined. And we also suggest that this universal access will not occur if there are only benefits for one small minority user group. CONCLUSIONS: We conclude that to assist mobility we need to provide universal access to objects and devices within the environment. Also, to support the mobility of visually impaired travellers we must first support all travellers regardless of their mobility needs. And to accomplish this we must separate the user interface from the real purpose (the functionality) of the object/device.