Q-complements on log surfaces

In this paper the log surfaces without \QQ-complement are classified. In particular, they are non-rational always. This result takes off the restriction in the theory of complements and allows one to apply it in the most wide class of log surfaces.Comment: Latex2e, 3 page

Photon noise in a random laser amplifier with fluctuating properties

We study fluctuations of the number of photocounts measured by an ideal photodetector illuminated by light scattered in an amplifying disordered medium, below the threshold for random lasing. We show that the variance of fluctuations and their correlation function carry information about fluctuating properties of the medium. A direct link is established between the fluctuations of the number of photocounts due to the amplified spontaneous emission (ASE) and the dimensionless conductance g of the medium. Our results suggest a possibility of probing amplifying disordered media by analyzing statistics of their ASE, without illuminating them from outside by a probe beam.Comment: 14 pages, 9 figure

Gaussian modeling and Schmidt modes of SPDS biphoton states

A double-Gaussian model and the Schmidt modes are found for the biphoton wave function characterizing spontaneous parametric down-conversion with the degenerate collinear phase-matching of the type I and with a pulsed pump. The obtained results are valid for all durations of the pump pulses, short, long and intermediately long

Mercado interno de Uluses Árticos de Sakha (Yakutia) en el Área Macro del Distrito Federal del Lejano Oriente

Este estudio revisa y compara el potencial de mercado de dos macro áreas en la República de Sakha (Yakutia) en la AZRF (zona ártica de la Federación de Rusia) y el FEFD (Distrito Federal del Lejano Oriente. Además, este trabajo muestra que una parte significativa de la oferta y la demanda en los mercados internos de los municipios seconcentra en el FEFD. Hasta hace poco, el Estado no consideraba al AZRF y al FEFD como un solo organismo gubernamental. Se transfirieron competencias al Ministerio de la Federación de Rusia para el desarrollo de la El Lejano Oriente y el Ártico han permitido que el territorio de los uluses árticos de la República de Sakha (Yakutia) se incluya en el desarrollo social y económico del FEF