We describe an adaptive version of the Hassenstein–Reichardt detector, which models direction-selective computation in the fly. The Hassenstein– Reichardt detector has a fixed time constant. However, several researchers have shown that the time constant of the fly’s motion system adapts to the temporal frequency or speed of the input. The time constant of our adaptive detector also adapts to th...

Failure detectors of the class denoted Pt eventually suspect all crashed processes in a permanent way (completeness) and ensure that, at any time, no more than n− t−1 alive processes are falsely suspected (accuracy), n being the total number of processes. This paper shows that a simple combination of such a failure detector with a two-step communication pattern can provide the processes with an...

Failure detectors of the class denoted Pt eventually suspect all crashed processes in a permanent way (completeness) and ensure that, at any time, no more than n− t−1 alive processes are falsely suspected (accuracy), n being the total number of processes. This paper first shows that a simple combination of such a failure detector with a two-step communication pattern can provide the processes w...

A Leader is a Coordinator that supports a set of processes to cooperate a given task. This concept is used in several domains such as distributed systems, parallelism and cooperative support for cooperative work. In completely asynchronous systems, there is no solution for the election problem satisfying both of safety and liveness properties in asynchronous distributed systems. Therefore, to s...

Unreliable failure detectors [3] are useful devices to solve several fundamental problems in fault-tolerant distributed computing, like consensus or atomic broadcast. In their original work [3], Chandra and Toueg proposed 8 different classes of unreliable failure detectors, and showed that all of them can be used to solve consensus in a crash-prone asynchronous system with reliable links. All t...

Abstract We present measurements of bulk radiocontaminants in the high-resistivity silicon CCDs from DAMIC experiment at SNOLAB. utilize exquisite spatial resolution to discriminate between ? and ? decays, search with high efficiency for spatially-correlated decays various radioisotope sequences. Using we measure a radioactive contamination 32 Si 140 ± 30 ?Bq/kg, place an upper limit on 210 Pb ...

Using high-resolution angle-resolved photoemission spectroscopy (ARPES), the topological property of the three-dimensional Bi(111) films grown on the Bi2Te3(111) substrate were studied. Very different from the bulk Bi, we found another surface band near the point besides the two well-known surface bands on the 30 nm films. With this new surface band, the bulk valence band and the bulk conductio...

Rigorous cross-property bounds that connect the effective thermal conductivity k. (or the electrical conductivity a.) and the effective bulk modulus K. of any isotropic, two-phase composite were recently derived by the authors. Here we reformulate these bounds and apply them to porous rocks with dry or fluid-filled pores. It is shown that knowledge of the effective conductivity can yield sharp ...