Results 141 to 150 of about 10,290 (185)
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Acta Astronautica, 1989
Abstract Up to now it has been considered that omnidirectional beacons and continuous emissions should be used to attract the attention of extraterrestrial intelligences. The case is considered here of using instead narrow beams directed consecutively to many targets, thus emitting to each target signals of short duration. A discussion on theoretical
Georg M. Gruber, Jorg Pfleiderer
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Abstract Up to now it has been considered that omnidirectional beacons and continuous emissions should be used to attract the attention of extraterrestrial intelligences. The case is considered here of using instead narrow beams directed consecutively to many targets, thus emitting to each target signals of short duration. A discussion on theoretical
Georg M. Gruber, Jorg Pfleiderer
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Electrical Engineering, 1939
The horsepower rating of a motor carries a dual implication — first, torque ability; second, temperature rise. The two are frequently confused. In selecting motors for duty-cycle jobs the two concepts should be considered separately. The motor rating and type should be chosen to fit the torque requirements of the job.
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The horsepower rating of a motor carries a dual implication — first, torque ability; second, temperature rise. The two are frequently confused. In selecting motors for duty-cycle jobs the two concepts should be considered separately. The motor rating and type should be chosen to fit the torque requirements of the job.
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International Journal of Business Data Communications and Networking, 2016
Wireless Sensor Networks (WSNs) became omnipresent in our daily life. As a result, they have emerged as a fruitful research topic, because of their advantages, especially their low cost and easy deployment. However, these attractive merits imply that available resources, especially energy, in each sensor node have to be wisely used through different ...
Nassima Bouadem +2 more
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Wireless Sensor Networks (WSNs) became omnipresent in our daily life. As a result, they have emerged as a fruitful research topic, because of their advantages, especially their low cost and easy deployment. However, these attractive merits imply that available resources, especially energy, in each sensor node have to be wisely used through different ...
Nassima Bouadem +2 more
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On the duty cycle of cyclotrons
Nuclear Instruments and Methods, 1962The poor (1–6%) duty cycle of present day cyclotrons is mainly due to: 1. r.f. extraction from the ion source; 2. r.f. defocusing caused by part of the r.f. phase; 3. loss of phase due to relativistic effects; 4. phase bunching at small radii; and 5. inefficient extractors. Possible methods of improvement are: 1. d.c. extraction from the ion source; 2.
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Merging ultra-low duty cycle networks
2011 IEEE/IFIP 41st International Conference on Dependable Systems & Networks (DSN), 2011Energy is the scarcest resource in ad-hoc wireless networks, particularly in wireless sensor networks requiring a long lifetime. Intermittently switching the radio on and off is widely adopted as the most effective way to keep energy consumption low.
Matthew Dobson +2 more
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On the Measurement of Duty Cycle and Channel Occupancy Rate
IEEE Journal on Selected Areas in Communications, 2013Duty cycle (DC) and channel occupancy rate (COR) measurements are important to characterize the availability of white space for cognitive radio systems (CRSs). The COR is related to the real occupancy of channels considered by a CRS but despite its importance it has not yet been widely considered for spectrum use measurements. Spectrum use measurements
Janne J. Lehtomäki +2 more
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Distribution of Pulsar Duty Cycles
Nature, 1969WE define a pulsar duty cycle, in the usual way, as the ratio of pulse width to the period of repetition of the pulse (Table 1). On the basis of some extremely simple physical assumptions we compute a histogram for distribution of pulsar duty cycles, and the distribution fits the observations reasonably well as shown in Fig. 1.
G. R. HENRY, H.-J. PAIK
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Duty cycling in opportunistic networks
Proceedings of the 17th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems, 2014In opportunistic networks, putting devices in energy saving mode is crucial to preserve their battery, and hence to increase the lifetime of the network and to foster user cooperation. However, a side effect of duty cycling is to reduce the number of usable contacts for delivering messages, thus increasing intercontact times and delays.
Biondi E +3 more
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Combating Aging with the Colt Duty Cycle Equalizer
2010 43rd Annual IEEE/ACM International Symposium on Microarchitecture, 2010Bias temperature instability, hot-carrier injection, and gate-oxide wear out will cause severe lifetime degradation in the performance and the reliability of future CMOS devices. The design guard band to counter these negative effects will be too expensive, largely due to the worst-case behavior induced by the uneven utilization of devices on the chip.
Erika Gunadi +3 more
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Miniaturized electrical stimulator with controllable duty cycles
American Journal of Physiology-Heart and Circulatory Physiology, 1995A stimulator with adjustable duty cycles is described for chronic electrical stimulation of skeletal muscles by way of a motor nerve. The stimulator is unique in that it can stimulate a muscle or group of muscles for 2-h intervals that alternate with variable periods of rest (2, 4, 6, 8, or 10 h). A given duty cycle is selected with a rotary switch at
J, Hang +3 more
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