Ionosonde measurements obtained at two Thailand ionospheric stations, namely Chumphon (10.72◦N, 99.37◦E, dip 3.0◦N) and Chiang Mai (18.76◦N, 98.93◦E, dip 12.7◦N) are used to examine the variation of the F2-layer peak electron density (Nm F2) which is derived from the F2-layer critical frequency, fo F2. Measured data from September 2004 to August 2005 (a period of low solar activity) are analyze...

We initiate a systematic study of linear sketching over F2. For a given Boolean function f : {0, 1} → {0, 1} a randomized F2-sketch is a distributionM over d×n matrices with elements over F2 such thatMx suffices for computing f(x) with high probability. We study a connection between F2-sketching and a two-player one-way communication game for the corresponding XOR-function. Our results show tha...

Highly pathogenic avian influenza virus (HPAIV) is a permanent threat due to its capacity to cross species barriers and generate severe infections and high mortality in humans. Recent findings have highlighted the potential role of PB1-F2, a small accessory influenza protein, in the pathogenesis process mediated by HPAIV in mammals. In this study, using a recombinant H5N1 HPAIV (wt) and its PB1...

We initiate a systematic study of linear sketching over F2. For a given Boolean function f : {0, 1} → {0, 1} a randomized F2-sketch is a distributionM over d×n matrices with elements over F2 such thatMx suffices for computing f(x) with high probability. We study a connection between F2-sketching and a two-player one-way communication game for the corresponding XOR-function. Our results show tha...

In classical fixed point and coincidence theory, the notion of Nielsen numbers has proved to be extremely fruitful. Here we extend it to pairs ( f1, f2) of maps between manifolds of arbitrary dimensions. This leads to estimates of the minimum numbers MCC( f1, f2) (and MC( f1, f2), resp.) of path components (and of points, resp.) in the coincidence sets of those pairs of maps which are ( f1, f2)...

For simplicity, we adopt the following rules: x denotes a set, n, m, k denote natural numbers, r denotes a real number, V denotes a real linear space, v, w denote vectors of V , A1 denotes a finite subset of V , and A2 denotes a finite affinely independent subset of V . One can prove the following propositions: (1) For all real-valued finite sequences f1, f2 and for every real number r holds (I...

In classical fixed point and coincidence theory the notion of Nielsen numbers has proved to be extremely fruitful. Here we extend it to pairs (f1, f2) of maps between manifolds of arbitrary dimensions. This leads to estimates of the minimum numbers MCC(f1, f2) (and MC(f1, f2), resp.) of pathcomponents (and of points, resp.) in the coincidence sets of those pairs of maps which are homotopic to (...