The model constraints from the observed trends for the quasi-periodic oscillation in RE J1034+396

We analyze the time variability of the X-ray emission of RE J1034+396 -- an active galactic nucleus with the first firm detection of a quasi-periodic oscillations (QPO). Based on the results of a wavelet analysis, we find a drift in the QPO central frequency. The change in the QPO frequency correlates with the change in the X-ray flux with a short time delay. The data specifically suggest a linear dependence between the QPO period and the flux, and this gives important constraints on the QPO models. In particular, it excludes explanation in terms of the orbiting hot spot model close to a black hole. Linear structures such as shocks, spiral waves, or very distant flares are favored.Comment: Astronomy & Astrophysics, in pres

Stochastic Semigroups and Coagulation Equations

A general class of bilinear systems of discrete or continuous coagulation equations is considered. It is shown that their solutions can be approximated by the solutions of appropriate stochastic systems describing the coagulation process in terms of stochastic semigroups.Розглянуто загальний клас білінійних систем дискретних або неперервних рівнянь коагуляції. Показано, що їх розв'язки можуть бути наближені розв'язками стохастичних систем, які описують процес коагуляції через стохастичні напівгрупи

Walka o wpływ na młode pokolenie między "władzą ludową" a Kościołem katolickim w woj. białostockim w l. 1945-1948

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A DESCRIPTIVE STUDY OF THE PRACTICES OF SUPERINTENDENTS IN DEVELOPING THEIR ADMINISTRATORS AS INSTRUCTIONAL LEADERS

The purpose of this qualitative study is to examine the influence of superintendents in developing their administrators as instructional leaders. This study will examine the practices of school districts that have demonstrated success on the Pennsylvania School System Assessment results in which students consistently scored proficient on their assessments. The assessment results in combination with the percentage of students in the district eligible for free and reduced lunch was the determining factors of which districts were chosen for this research study. The researcher will examine the practices and opportunities provided to administrators that develops their instructional leadership skills. The purpose is to determine if common themes exist, such as staff development, embedded activities and authentic learning, to name a few, that support administrators in being instructional leaders. The research will provide the effective practices demonstrated by school districts that support instructional leadership. Improving teaching and learning is a major responsibility of leaders in our schools. Therefore, this research study will provide the strategies implemented by superintendents in developing the practices to support administrators in becoming instructional leaders in their building