Rhythmically active networks are typically composed of neurons that can be classified as silent, tonic spiking, or rhythmic bursting based on their intrinsic activity patterns. Within these networks, neurons are thought to discharge in distinct phase relationships with their overall network output, and it has been hypothesized that bursting pacemaker neurons may lead and potentially trigger cyc...

[1] We have recently suggested that one solar cycle was lost in the beginning of the Dalton minimum during 1790s [Usoskin et al., 2001]. Earlier, this cycle has been combined with the preceding activity to form the exceptionally long solar cycle 4 in 1784-1799 with an irregular phase evolution. Here we show that historical data of auroral occurrence provide independent evidence for the existenc...

Blood hypercoagulability or thrombogenicity can be one of the main causes of the cardiovascular diseases in young population without traditional pathologic risk factors such as diabetes mellitus, hypertension or hyperlipidemia. The effect of aerobic exercise on coagulation and fibrinolysis has been studied extensively Regarding to the effectivness of resistance exercises to increase functional...

A convex game is characterized by increasing marginal utility for coalition membership as coalitions grow larger. The core of any n~person game is the set of outcomes that cannot be profitably blocked by any coalition. It is known that various solution concepts bear direct relation to the core when the game concerned is convex. Thus, the von Neumann-Morgens tern solution and the bargaining set ...

Parallel Simulation has presented the possibility of performing higk speed simulation. However, when attempting to make a link between the requirenzents of Parallel Simulation and Discrete Event Simulation wed in commercial areas such as manufacturing a major problem a r k s . This lies in the decomposition of the simulation into a series of concurrently executing objects. Using the activity cy...

A wide variety of dynamical processes are influenced by some sort of reaction. In its most general sense, a “reaction” is when some species A changes into some other species B during a process, possibly via an interaction with other species. The most obvious example is a chemical reaction, when two or more reactants interact to form a third product, e.g., A + B  C or A + B  2A. Combustion is ...

We divide R2 in l sectors S1, ..., Sl, with l > 1 even. We define in R2 a discontinuous differential system such that in each sector Sk, for k = 1, ..., l, is defined a smooth generalized Lienard polynomial differential equation ẍ + fi(x)ẋ + gi(x) = 0, i = 1, 2 alternatively, where fi and gi are polynomials of degree n−1 and m respectively. We apply the averaging theory of first order for disco...

We have obtained empirical relations between the p-mode frequency shift and the change in solar activity indices. The empirical relations are determined on the basis of frequencies obtained from BBSO and GONG stations during solar cycle 22. These relations are applied to estimate the change in mean frequency for the cycle 21 and 23. A remarkable agreement between the calculated and observed fre...

The problems encountered during scuba diving may be a contributing factor in an episode of decompression illness (DCI). Evidence exists that there may be a relationship between the position in the menstrual cycle and the occurrence of DCI. We examined, by prospective observation in female recreational scuba divers, any interaction between reported problems during diving (RPDD) and the position ...

this paper presents a new arc starter circuit that is usable in manual metal arc welding (mma) power supplies. the proposed circuit uses an auxiliary circuit and a series coupling transformer for adding high frequency spikes to output dc voltage during arc striking. the proposed circuit is usable in inverter based arc welding supplies and it could result in a decrease of weigh, volume and expen...