48 research outputs found
Optimal load management of autonomous power systems in conditions of water shortage
The issues of optimizing the operation of micro hydropower plants in conditions of water scarcity, performed by additional connection to the grid of an energy storage system and wind power turbine, as well as optimal load management, are considered. It is assumed that the load of the system is a concentrated autonomous power facility that consumes only active power. The paper presents a rigorous mathematical formulation of the problem, the solution of which corresponds to the minimum cost of an energy storage system and a wind turbine, which allows for uninterrupted supply of electricity to power facilities in conditions of water shortage necessary for the operation of micro hydropower plants (under unfavorable hydrological conditions). The problem is formulated as a nonlinear multi-objective optimization problem to apply metaheuristic stochastic algorithms. At the same time, a significant part of the problem is taken out and framed as a subproblem of linear programming which will make it possible to solve it by a deterministic simplex method that guarantees to find the exact global optimum. This approach will significantly increase the efficiency of solving the entire problem by combining metaheuristic algorithms and taking into account expert knowledge about the problem being solved
Social Justice Based on Religious Forms of Prosociality in Russia
This article shows the social and psychological aspects of the prosociality in Russia which help to see the ways to social justice forming. In Russia, under the influence of Christianity forms an approach to prosocial behavior as a mandatory element of public life. Objective of study is an identification of the peculiarities of prosocial manifestation in Russian people with different levels of religiosity in modern social and cultural conditions. This study is conducted on the base of the complex of methods, namely, The Scale of Altruism (SRA); Social Norms of Prosocial Behavior (SNPB); Index of Core Spiritual Experiences (INSPIRIT); Religious Orientation Scale (RSO). The sample consists of 221 people living in various Russian cities (38% of men, 62% of women) aged 20 to 66 years (M-39.8). As a result, the collected data and their evaluation and discussion help to support the idea that spirituality and citizenship have a regulatory influence on the prosocial motives of mercy, tolerance, and altruism
Glucose-induced β cell production of IL-1β contributes to glucotoxicity in human pancreatic islets
Erratum / Corrigendu
Seasonal hydrological and hydrochemical surveys in the Voevoda Bay (Amur Bay, Japan Sea)
Hydrological and hydrochemical surveys were conducted in the Voevoda Bay in May, August, and October, 2011 and February, 2012, in total 140 stations. Free water exchange of the bay with the Amur Bay is observed, with exception of its inner bights Kruglaya and Melkovodnaya. The water exchange is maintained by anticyclonic circulation with the inflow along the southern coast and outflow along the northern coast of the Voyevoda Bay. However, the opposite cyclonic circulation is observed in the Melkovodanaya Bight because of its coastal line patterns and fresh water discharge by the river. Dissolved oxygen content and partial pressure of CO2 in the bay waters are determined mostly by intensive processes of production and destruction of organic matter. There are three main groups of primary producers there, as diatom algae, sea grass Zostera marina , and periphyton. Specific chemical regime is formed in the Melkovodnaya Bight, in particular in winter when primary production depends on the ice cover and is driven by variations of photosynthetically active radiation passed through the ice. Seasonal variability of production-destruction processes intensity is discussed on the data of chemical parameters changes
Permafrost is warming at a global scale
Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet to date, no globally consistent assessment of permafrost temperature change has been compiled. Here we use a global data set of permafrost temperature time series from the Global Terrestrial Network for Permafrost to evaluate temperature change across permafrost regions for the period since the International Polar Year (2007-2009). During the reference decade between 2007 and 2016, ground temperature near the depth of zero annual amplitude in the continuous permafrost zone increased by 0.39 ± 0.15 °C. Over the same period, discontinuous permafrost warmed by 0.20 ± 0.10 °C. Permafrost in mountains warmed by 0.19 ± 0.05 °C and in Antarctica by 0.37 ± 0.10 °C. Globally, permafrost temperature increased by 0.29 ± 0.12 °C. The observed trend follows the Arctic amplification of air temperature increase in the Northern Hemisphere. In the discontinuous zone, however, ground warming occurred due to increased snow thickness while air temperature remained statistically unchanged
MESSENGER and Mariner 10 flyby observations of magnetotail structure and dynamics at Mercury
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94896/1/jgra21525.pd
Efficiency of heat recovery unit in D-building
The main purpose of this thesis work is to consider how the heat recovery unit in D-building works and to search errors in the system (if any exist) and try to find methods to improve efficiency heat
recovery system.
Analysis was performed according with database from automation in D-building. Database contains
stored measurements of the temperatures before and after heat recovery unit, supply and exhaust air flows and heat electricity consumption. According this data it is possible to make diagrams and analyze functioning of the heat recovery unit.
Based on data from automation it can be concluded that the reason of malfunctioning of heat recovery unit is incorrect settings of automation system. Fluctuation in the diagram of the annual energy efficiency in the first part of the month the due to incorrect changing speed of the rotation wheel. It is necessary to fix settings to reach right functioning