THE TRAJECTORY OF POSTREVOLUTIONARY RUSSIAN DIASPORA THOUGHT AND ITS RELATIONSHIP TO RUSSIAN EXCEPTIONALISM

Attention is being paid to the rise of post-Soviet nationalism, particularly giventhe conflict in Ukraine. To this end, the present paper examines Russian thought and itsrelationship to exceptionalism in the context of the post-Revolutionary diaspora. Examiningthe prevailing approach taken to freedom of thought, in light of Nikolai Berdyaev, Fr.Sergius Bulgakov and other thinkers, a trajectory can be identified that departs from theexceptionalist narrative. In the diaspora, this was accented by emergence in the contextof the ecumenical movement and the keenness demonstrated by the emigres, which wasfitting to the East / West interaction of the movement. In an important sense, the notionof Sobornost emerged as a sign of the diaspora’s theological development – in light theevolution of the notion and its ecclesiological aspect, but also in the journal by the samename, which was published under the auspices of the Fellowship of St. Alban and St. Sergius.This altogether demonstrates a trajectory of thought that emerged in the diasporaintelligentsia, which stood in opposition to exceptionalism, messianic or nationalist sentiments,inasmuch as it was a inheritor of pre-Revolutionary Russian thought, is a contrastto the post-Soviet milieu

Hydropower converters with head differences below 2·5 m

Hydropower with very low head (VLH) differences constitutes a largely unused potential source of renewable energy. A literature review of hydropower converters for VLH differences covering the engineering literature from the 1830s onwards was conducted to assess the potential of historic, current and emerging technologies. The results showed that a large number of different interesting technologies were used/developed, and that several novel and promising concepts are currently under development. Technologies emerged for different market segments: water wheels for low flow rates, turbines for large flow volumes. To take account of increased ecological demands and the desire for cost reduction, further improvements of existing technologies and new converter technologies have been developed. Other concepts described in the literature were apparently never applied although they promise development potential. The information gathered allowed for a comparison of available technologies with respect to area of application, performance, ecological impact and cost level

A sharp correction theorem

Under certain conditions on a function space X, it is proved that for every $L^∞$-function f with $∥f∥_{∞} ≤ 1$ one can find a function φ, 0 ≤ φ ≤ 1, such that φf ∈ X, $mes{φ ≠ 1} ≤ ɛ∥f∥_1$ and $∥φf∥_X ≤ const(1 + log ɛ^{-1})$. For X one can take, e.g., the space of functions with uniformly bounded Fourier sums, or the space of $L^∞$-functions on $ℝ^n$ whose convolutions with a fixed finite collection of Calderón-Zygmund kernels are also bounded