How does culture shape our concepts? Across many cultures, people conceptualize time as if it flows along a horizontal timeline, but the direction of this implicit timeline is culture specific: Later times are on the right in some cultures but on the left in others. Here we investigated whether experience reading can determine the direction and orientation of the mental timeline, independent of...

Protons produced in electromagnetic showers formed by the reverse-electron flux are usually the largest component of the time-averaged polar-cap open magnetic-flux line current in neutron stars with positive corotational charge density. Although the electric-field boundary conditions in the corotating frame are time-independent, instabilities on both medium and short time-scales cause the curre...

A hybrid system approach is adopted to study the dynamic behaviour of a controlled reverse flow reactor in which a feedback control law dictates the occurrence of flow inversions. Typical behaviour of hybrid systems (Zeno phenomena) are found coexisting with other regimes like limit cycles and quasi-periodic regimes. Construction of impact maps, continuation of limit cycles and detection of loc...

BACKGROUND AND PURPOSE The aim of this study is to elucidate the effect of orthostatic hypotension on changes in cerebral blood flow. METHODS Blood flow velocities of both the common carotid artery and vertebral artery were measured using duplex ultrasonography in 12 patients: 6 with familial amyloidotic polyneuropathy, 3 with Shy-Drager syndrome, 2 with pandysautonomia, and 1 with senile ort...

Die erste Phase von Migrationsprojekten besteht im Reverse Engineering der zu migrierenden Software. Das Programmverstehen und die Redokumentation von Legacy-Systemen, die über einen langen Zeitraum historisch gewachsen sind, bilden die Voraussetzung einer erfolgreichen Migration. Das vom Verfasser entwickelte Software-Werkzeug Flow Graph Manipulator (FGM) wird für die Programmanalyse und Redok...

Natural gas is becoming an increasingly important energy source, due to the increasing energy demands and declining oil reserves, whereas large volumes of natural gas are still widely available at remote locations. In view of the existing infrastructure for liquid fuels, natural gas is most efficiently used in the transport sector by converting it to liquid fuels via the Gas-To-Liquid process. ...

THE CANADIAN JOURNAL OF CHEMICAL ENGINEERING 695 In the hierarchy of waste management techniques it is better to prevent harmful emissions from being generated in the first place. If this laudable objective is not practically feasible, the treatment of emissions to produce less harmful substances is worthy of detailed consideration. For such waste treatment processes, the most technically and e...

Power plant generators are important components of an electrical energy system. They should be constantly monitored and protected in order to maintain the quality and reliability of the power supply. Otherwise, generators may occur in case of faults or incorrect operation. One of them is reverse power condition. Reverse power flow can be cause important problems if it is not considered in the p...

Checkpointing is a technique to reduce the memory consumption of adjoint programs produced by reverse Automatic Differentiation. However, checkpointing also uses a non-negligible memory space for the so-called “snapshots”. We analyze the data-flow of checkpointing, yielding a precise characterization of all possible memory-optimal options for snapshots. This characterization is formally derived...