منابع مشابه
Embedded Firmware Diversity for Smart Electric Meters
Smart meters are now being aggressively deployed worldwide, with tens of millions of meters in use today and hundreds of millions more to be deployed in the next few years. These low-cost (' $50) embedded devices have not fared well under security analysis: experience has shown that the majority of current devices that have come under scrutiny can be exploited by unsophisticated attackers. The ...
متن کاملThe Transatlantic on 2200 Meters
here has been much excitement below our so-called top band at 1.8 MHz. At less than one-tenth this frequency, near 136 kHz, you will find many amateurs enjoying QSOs using a variety of modes. Although US and Canadian amateurs need special permission to transmit here, there is a 2200 meter amateur band in many European countries and in New Zealand. Aside from its low frequency, the most striking...
متن کاملOn Calibration of pH Meters
The calibration of pH meters including the pH glass electrode, ISE electrodes, buffers, and the general background for calibration are reviewed. Understanding of basic concepts of pH, pOH, and electrode mechanism is emphasized. New concepts of pH, pOH, as well as critical examination of activity, and activity coefficients are given. The emergence of new solid state pH electrodes and replacement...
متن کاملRamp Meters on Trial: Evidence from the Twin Cities Ramp Meters Shut-off
Ramp meters in the Twin Cities have been the subject of a recent test of their effectiveness, involving turning them off for 8 weeks. This paper analyzes the results with and without ramp metering for several representative freeways during the afternoon peak period, depending on data availability. Seven performance measures: accessibility, mobility, equity, productivity, consumer surplus, trave...
متن کاملStudy on the Wireless Heat Meters
The design of a new type heat meters based on RFID technology are presented in this paper. By use of RFID technology in heat meters, the data can be exchanged between heat meters and heat supplying department by RF cards. The information can be transmitted in a non-contact way. In this way, the purpose of automatic identification can be achieved. The experimental study of the heat meters is als...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1882
ISSN: 0036-8733
DOI: 10.1038/scientificamerican10141882-5642asupp