Recent power quality studies have been focused on the source-identification of voltage disturbances at distribution network busses. This paper describes a method aimed at correlating indirect-lightning events with power systems relay operations, associated with voltage dips. The proposed method, based on the coordinated use of the Italian lightning location system CESI-SIRF, the Italian monitor...

(Bell Labs) during the 20-some years following Bell Labs' entry into the digital computer era. In doing so, I describe various problems that Bell Labs was addressing and characteristics of the machines developed as solutions. During this period, Bell Labs was AT&T's research and development arm, and Western Electric was AT&T's manufacturing division. Western Electric and AT&T each owned 50 perc...

In long transmission lines, the charging current caused by the shunt capacitance decreases the accuracy in impedance based fault location. To improve the accuracy of fault location, this paper presents a novel scheme, where two Digital Fault Recorders (DFRs) are installed in a line. They can send the transient data of the faults to the both ends of a line. To estimate the distance of a fault, i...

Studies o f 240 transthoracic fibrillation-defibrillation episodes in calves of 91-108 kg are reported. The waveform in 120 o f the episodes was a one-cycle, quasisinusoidal waveform having peak currents o f 64 and 3 2 A and half-cycle durations o f 4 and 6 ms. The episodes were interlaced with 120 others involving critically dam ped sinusoid wave­ forms having a 70.2-A peak current at 1.1 m s ...

A nonobtrusive technique for measuring misalignment errors in multistage free-space optical interconnects is proposed. The technique makes use of dedicated microoptics to relay higher order dedicated alignment beams generated by an optical power supply onto alignment detectors located on the periphery of a smart pixel chip. An implementation of this technique for measuring lateral (x–y) misalig...

Outsourcing has emerged as a key method of managing Information Technology and Systems (ITS) in the current era, though facilities management, a form of outsourcing, has existed since the 1970s. The growth of outsourcing as an ITS governance mechanism has dramatically increased during the 1990s by tens of billions of dollars annually. Part of this current growth may come from new kinds of outso...

The paper studies the capacity of the OFDM and the OFDMA relay networks. Two relay schemes, amplify-and-forward (AF) relay and decode-and-forward (DF) relay are analyzed and compared for both OFDM and OFDMA relay networks. A relay node selection algorithm is proposed for OFDMA relay network. Numerical results show that under small relay power transmission, AF outperforms DF while the opposite i...

to evaluate the yield components, yield and land equivalent ratio affected by relay intercropping of sunflower (helianthus annuus l.) with faba bean (vicia faba l.), a field experiment was arranged based on a randomized complete block design with three replications at the agricultural research station payamenoor university of nagadeh, iran during growing reason of 2012-2013. the treatments incl...