We study the combinatorial properties of optimal refueling policies, which specify the transportation paths and the refueling operations along the paths to minimize the total transportation costs between vertices. The insight into the structure of optimal refueling policies leads to an elegant reduction of the problem of finding optimal refueling policies into the classical shortest path proble...

Using alternative fuel vehicles is one of the ways to reduce the consumption of fossil fuels which have many negative environmental effects. An alternative fuel vehicle needs special planning for its refueling operations because of some reasons, e.g. limited number of refueling stations, uncertain refueling queue times in the stations, variable alternative fuel prices among the stations, etc. I...

Estimation Algorithm for Autonomous Aerial Refueling Using a Vision Based Relative Navigation System. (August 2005) Roshawn Elizabeth Bowers, B.S., Texas A&M University Chair of Advisory Committee: Dr. John Valasek A new impetus to develop autonomous aerial refueling has arisen out of the growing demand to expand the capabilities of unmanned aerial vehicles (UAVs). With autonomous aerial refuel...

In this paper, we study the scheduling problem arising from refueling multiple satellites in a circular constellation. It is assumed that there is no fuel delivered to the constellation from an external source. Instead, all satellites in the constellation are assumed to be capable of refueling each other (peer-to-peer refueling). The total time to complete the rendezvous maneuvers including the...

Atmospheric benzene, toluene, ethylbenzene, and xylenes (BTEX) can lead to multiple health injuries. However, what remains uncertain is the effect of long-term exposure to low levels of BTEX. Thus, we determined the BTEX levels in the air from the refueling and office areas in gas stations. Then we collected workers' (200 refueling vs. 52 office workers) peripheral blood samples to analyze the ...

In this paper, we study pure peer-to-peer (henceforth abbreviated as P2P) and mixed (combined single-spacecraft and P2P) satellite refueling in circular orbit constellations comprised of multiple satellites. We consider the optimization of two conflicting objectives in the refueling problem and show that the cost function we choose to determine the optimal refueling schedule reflects a reasonab...

Abstract With the increase of automobiles on hand in China, automobile refueling emissions, as an important part volatile organic compounds (VOC), have been paid more and attention. Frequent is related to fuel vapor concentration operation safety gas stations. Reducing emissions can improve recovery efficiency reduce waste Therefore, research test began attract However, due long pre-processing ...

We explore a fixed-route vehicle refueling problem as a special case of the inventorycapacitated lot-sizing problem, and present a linear-time greedy algorithm for finding optimal refueling policies.

Small unmanned aerial vehicles (UAVs) are hindered by their limited payload and duration. Consequently, UAVs spend little time in their area of operation, returning frequently to base for refueling. The effective payload and duration of small UAVs is increased by moving the support base closer to the operating area; however this increases risk to personnel. Performing the refueling operations a...