Understanding and Minimizing <i>V</i> _OC Losses in All?Perovskite Tandem Photovoltaics

Minimizing Losses in Hay Storage and Feeding

STORAGE AND FEEDING Each year more than 60 million acres of forage crops are harvested for hay in the United States. Annual production from this acreage is over 150 million tons of hay valued at more than 12 billion dollars. Hay is the most widely grown mechanically-harvested agronomic crop in the United States. As a source of nutrition for livestock, hay offers numerous advantages. It can be m...

Intelligent In-Vehicle Infotainment(IVI)

A New Algorithm for Optimum Voltage and Reactive Power Control for Minimizing Transmission Lines Losses

Reactive power dispatch for voltage profile modification has been of interest Abstract to powerr utilities. Usually local bus voltages can be altered by changing generator voltages, reactive shunts, ULTC transformers and SVCs. Determination of optimum values for control parameters, however, is not simple for modern power system networks. Heuristic and rather intelligent algorithms have to be so...

Perovskite-perovskite tandem photovoltaics with optimized band gaps.

We demonstrate four- and two-terminal perovskite-perovskite tandem solar cells with ideally matched band gaps. We develop an infrared-absorbing 1.2-electron volt band-gap perovskite, FA0.75Cs0.25Sn0.5Pb0.5I3, that can deliver 14.8% efficiency. By combining this material with a wider-band gap FA0.83Cs0.17Pb(I0.5Br0.5)3 material, we achieve monolithic two-terminal tandem efficiencies of 17.0% wit...

A Tandem Queueing System with Losses and Blocking

Abstract. We consider a tandem queueing system BMAP/G/1 → •/M/N/0. The input flow is described by the BMAP (Batch Markovian Arrival Process). After receiving service at the first stage a customer proceeds to the second stage. The service at the second stage requires a random number of servers. If a customer does not see the required number of free servers it leaves the system forever or waits t...