We study a scheduling problem that belongs to the yard operations component of the railroad planning problems, namely the hump sequencing problem. The scheduling problem is characterized as a single-machine problem with stepwise tardiness cost objectives. This is a new scheduling criterion which is also relevant in the context of traditional machine scheduling problems. We produce complexity re...

Compressible large-eddy simulations of turbulent flow over a wall-mounted hump with active flow control are performedand comparedwithprevious experiments. Theflow is characterizedby the unsteady separationbefore the steep trailing edge, which naturally reattaches downstream of the hump to form an unsteady turbulent separation bubble. The lowMachnumber large-eddy simulation demonstrated a goodpr...

In the selective withdrawal experiment fluid is withdrawn through a tube with its tip suspended a distance S above an unperturbed two-fluid interface. At low withdrawal rates, Q, the interface forms a steady state hump and only the upper fluid is withdrawn. When Q is increased (or S decreased), the interface undergoes a transition so that the lower fluid is entrained with the upper one, forming...

This paper studies the within model-year pricing and production of new automobiles. Using new monthly data on U.S. transaction prices we document that for the typical new vehicle, the retail price (net of rebates and financing incentives) falls 9.4 percent over the 17-month model year. Concurrently, both sales and inventories are hump-shaped. To explain these time-series, we formulate a market ...

Riley’s Hump, in the recently created South Tortugas Ecological Reserve, is the historical site of a spawning aggregation of mutton snapper (Lutjanus analis), perhaps the only site in the southeastern United States. The aggregation was exploited heavily by commercial fishermen for decades prior to the area being declared an ecological reserve in 2001. Fishery managers hope that the population o...

Results The results of a prospective series of the first 100 consecutive patients were studied using EOS X-ray and compared with results obtained by other braces. Radiologically, in the frontal plane, the immediate in brace reduction is on average (0.72) (0.63 +0.19 for thoracic curves & 0.76 +0.26 for lumbar curves. These results can be classified: Depending on the type of curvature: thoracolu...

We have reviewed 15 cases of triplane fracture of the distal tibia. The mechanism of injury is lateral rotation and the anatomical pattern of the fracture depends on the state of the growth plate at the time of injury. In seven of our cases the anteromedial part of the growth plate was fused, but in eight children the plate was completely open. In six of these eight children there was a hump or...

In the selective withdrawal experiment fluid is withdrawn through a tube with its tip suspended a distance S above an unperturbed two-fluid interface. At low withdrawal rates, Q, the interface forms a steady state hump and only the upper fluid is withdrawn. When Q is increased (or S decreased), the interface undergoes a transition so that the lower fluid is entrained with the upper one, forming...

Double discharges (doublets) were recorded from human soleus (SOL), where they have never been reported before. The data analyzed in this study were collected from 12 healthy volunteers. The subjects were recruited for other studies, concerning: (1) estimation of motoneurons' (MNs) afterhyperpolarization (AHP) duration and (2) analysis of motor unit responses to nerve stimulation, and were not ...

Considering the effects of hot ions and Lorentz force, a numerical study on the properties of solitary kinetic Alfvén waves ~SKAWs! in the inertial limit region in the magnetosphere is presented. In contrast to the results obtained by Hasegawa and Mima @Phys. Rev. Lett. 37, 690 ~1976!#, Shukla et al. @J. Plasma Phys. 28, 125 ~1982!#, and Wu et al. @Phys. Plasmas 3, 2879 ~1996!#, both hump and d...