Search results for "PhD thesis"
showing 3 items of 3 documents
p-grupos finitos
1997
In the first part, new bounds for the number of conjugacy classes of maximal length of a finite $p$-group $G$, $r(G)$, are obtained, and they are related with the length of these classes. If $r(G)=p^m-b-1$, there exists a unique normal subgroup of order $p^b$, $N_b$, which is characteristic, and structural properties of these groups are studied when $b\le 3$, by paying special attention to the relation between $N_b$, $Z(G)$ and $G$. In the second part, new bounds for the degree of commutativity of a $p$-group of maximal class are established. In Chapter 2, the bounds known for $c$ are reviewed. In Chapter 3, the reuslts obtained by Shepherd for $c_0\le 4$ are extended to $c_0\le 10$ by mean…
Character of sapropel properties based on its formation conditionsand possibilities of its use
2020
Tika pētītas sapropeļa īpašību un izmantošanas iespēju izmaiņas Latvijā. Tika izveidota saldūdens ezeru sapropeļa GIS datubāze un sapropeļa tipu klasifikācija. Trīs ezeru profilu izpēte tika īstenota izmantojot multidisciplināru pieeju. Lai rekonstruētu vides un klimata apstākļus, tika veikta nogulumu vecuma noteikšanu. Sapropeļa uzkrāšanās ir raksturīga ezeriem, kas veidojušies Augšpleistocēna nogulumos, kas ietekmē sapropeļa tipu. Sapropeļa veids un sastāvs atšķiras katras iegulas ietvaros un atkarīgs no ūdens ķīmiskā sastāva, dziļuma un temperatūras. Jaunākajos nogulumos ir augstāka metālu koncentrācijas, kas saistīts ar cilvēka darbības ietekmi. Atslēgvārdi: saldūdens sapropelis, gitija…
Rédiger pour être publié ! 2e édition 2012
2012
Publish or perish. This saying clearly exemplifies that science communication is vital for scientists, research bodies and nation competitiveness. Nowadays both computers and internet have deeply changed the way scientific articles are written and published. In an editorial world moving at accelerated pace, scientists are eager to get their papers published in the best journals because impact factors are ruling careers and funding. Since fundings are provided by various public and private bodies, scientific papers should be partly understandable by a wide audience from journalists to entrepreneurs, political leaders and the general public. However, as an editor of scientific journals, I obs…