Two methods of searching for periodicity in weighted time point series are applied to earlier major solar are data during three decades (1956{1985). The results of this analysis are tested against new solar are data during the four years 1989{1993. Active longitudes rotating with a constant synodic period of 22: d 069 0: d 012 could explain the complete data set over both hemispheres. The nonun...

Cochran constructed many links with Alexander module that of the unlink and some nonvanishing Milnor invariants, using as input commutators in a free group and as an invariant the longitudes of the links. We present a different and conjecturally complete construction, that uses elementary properties of clasper surgery, and a different invariant, the tree-part of the LMO invariant. Our method al...

objective: the aim of this study is to compare the incidence of unwanted pregnancies in women under 35 and those over 35 years, compare the results with the previous data, and also to determine the causes of unwanted pregnancies in these women materials and methods: this cross-sectional study (descriptive - analysis) is performed on 400 pregnant women who had referred to the laboratories of shi...

We study the relationships of the 27-day variations of the galactic cosmic ray (GCR) intensity and anisotropy with the 27-day variations of the solar wind (SW) velocity, Wolf number (Rz) and interplanetary magnetic field (IMF) strength for different positive (A > 0) and negative (A < 0) polarity periods of the solar magnetic cycles based on the experimental data. We found that the long-lived ac...

A sequence of AR Lac seasonal light curves covering the period 1967-1992 is analysed in the framework of the starspot hypothesis to derive the spot distribution and evolution on the component stars. The adopted approach makes use of the Maximum Entropy and Tikhonov principles to compute maps of the stellar photospheres exploiting also the eclipse scanning technique. Reliable results on the dist...

Huancayo is the only equatorial electrojet station where the daytime increase of horizontal geomagnetic ®eld (H) is associated with a simultaneous increase of eastward geomagnetic ®eld (Y). It is shown that during the counter electrojet period when DH is negative, DY also becomes negative. Thus, the diurnal variation of DY at equatorial latitudes is suggested to be a constituent part of the equ...

We analyze photometric data of the active RS CVn–type star HR 1099 for the years 1975– 2006 with an inversion technique and reveal the nature of two activity cycles of 15–16 yr and 5.3±0.1 yr duration. The 16 yr cycle is related to variations of the total spot area and is coupled with the differential rotation, while the 5.3 yr cycle is caused by the symmetric redistribution of the spotted area...

We analyze photometric data of the active RS CVn–type star HR 1099 for the years 1975–2006 with an inversion technique and reveal the nature of two activity cycles of 15–16 yr and yr duration. The 16 yr cycle is 5.3 0.1 related to variations of the total spot area and is coupled with the differential rotation, while the 5.3 yr cycle is caused by the symmetric redistribution of the spotted area ...