Polar magnetic disturbances and intrusion of charged particles into the ionosphere

Polar magnetic disturbances and data on charged particles in ionosphere evaluated to prove regularity of occurrenc

The Riemann problem for functions with polar lines of higher orders

© 2014, Allerton Press, Inc. We consider solutions of the jump problem, homogeneous and inhomogeneous Riemann problems for functions with polar lines of orders pk +1 (k = 1, 2, … ), pk ⩾ 0. We study the cases of continuous and discontinuous coefficients. In the special case pk = 0 the obtained results turn into the earlier known ones

Asymptotics of conditional probabilities of succesful allocation of random number of particles into cells

© 2017 Walter de Gruyter GmbH, Berlin/Boston 2017. The article is devoted to the memory of Valentin Fedorovich Kolchin. Let ζ, ζ i (i N) be independent identically distributed nonnegative integer-valued random variables, (η i1 ,.., η iN ) be the fillings of cells in the generalized scheme of allocation of ζ i particles into N cells, 1 ≤ i ≤ n, for fixed Z n = (ζ 1 , .., ζ n ) these allocation schemes are independent. We consider the conditional probabilities P(A n,N | Z n ) of the event A n,N = {each cell in each of n allocation schemes contains no more than r particles}, where r is some fixed number. The sufficient conditions for the convergence of the sequence P(A n,N | Z n ) to a nonrandom limit with probability 1 are given. It is shown that the random variable ln P(A n,N | Z n ) is asymptotically normal. Applications of the obtained results to the noise-proof encoding are discussed

USING WIND TURBINES TO GENERATE HEAT

In this article discusses one of the alternative renewable energy sources – wind energy. Its practical use is carried out with the help of wind motors. And below are a few different schemes of heat generation using these engines.В данной статье рассматривается один из альтернативных возобновляемых источников энергии – энергия ветра. Её практическое использование осуществляется с помощью ветряных двигателей. Представлены несколько различных схем выработки тепла с помощью данных двигателей

Analyzing the Influence of Diatomite and Mineral Fertilizers on the Features of Cadmium-Contaminated Urban Lawns

Contamination with heavy metals is among key anthropogenic pressures, experienced by urban lawns. It results in depletion of their environmental quality and functions. Implementation of fertilizers, containing silicon, is a promising approach to increase urban lawns’ sustainability to heavy metals’ pollution. Based on the field experiment, an influence of cadmium contamination on the chemical features and biomass quality of modeled urban green lawn ecosystems was studied. We demonstrated an increase of cadmium consumption by biomass on the second year of observations as the result of diatomite implementation together with mineral fertilizers. Both total sugar and disaccharides’ content in biomass was 15-20% higher for the contaminated plots where diatomite was implemented together with mineral fertilizers, compared to the uncontaminated control. This evidences a positive effect of the implemented reclaiming on stress tolerance of the green lawns

Structural study of the type II 3-dehydroquinate dehydratase from Actinobacillus pleuropneumoniae

9 pages, 7 figures, 2 tables.The structure of the type II dehydroquinate dehydratase (DHQase) from Actinobacillus pleuropneumoniae, the third enzyme of the shikimate pathway, has been determined. Crystals diffracting to 1.7 Å were obtained in space and on earth using the counter-diffusion technique. The structure was solved using molecular replacement and refined to high resolution. The overall structure of the dodecameric enzyme is described and compared with structures of DHQases from other bacteria. DHQases contain a flexible loop that presumably closes over the active site upon substrate binding. The enzyme can exist in an open or closed conformation. The present structure displays the open conformation, with a sulfate anion bound in the active site. The availability of this structure opens a route to structure-based antibiotics targetting this pathogenic bacterium.We thank Professor Kabsch for providing XDS free of charge. We acknowledge the support of the European Space Agency and the European Community Action to Research Infrastructure Action of the Improving Human Potential Programme to the EMBL Hamburg Outstation, contract No. HPRI-CT-1999-00017. We thank Olivier Minster (ESA) for his support of space science. The authors acknowledge the excellent work of Dr Eva ManÄ as in managing the logistics concerning the space mission. We thank Viscount Dirk Frimout for his support for space crystallization experiments.Peer reviewe