v.4 n.1 February
Parana Journal of Science and Education. v.4, n.1, February (2018).
Summary
Articles
Tolga Yarman. Parana J. Sci. Educ., v.4, n.1, (1-5), February 03, 2018.
DOI: doi.org/10.5281/zenodo.3819233
Abstract
A comprehensive analysis, with respect to energy, nuclear energy, and alternative energy resources on the technical and political level is presented. A sound utopia based on the imitation of natural cycles that have given birth to mankind on Earth, is drawn.
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Valery Borisovich Morozov. Parana J. Sci. Educ., v.4, n.1, (6-9), February 08, 2018.
DOI: doi.org/10.5281/zenodo.3838169
Abstract
According to the principle of the general relativity theory, the gravity field equation should contain the field energy as a source of the field itself. Including the field energy-momentum tensor into the Einstein’s equation brings extra unknown quantities to the equation. Such equation is not suitable for a metric finding; however it allows – based on the known metric – calculating the whole energy-momentum tensor of both matter and gravitational field. As the gravity field metric, the metric of continuous field can be used, parameters of which are found from the generally covariant one-parametric equation. Here, the solutions are given of the equation for the spherically symmetric stationary problem. One of the solutions coincides practically with that by Schwarzschild for weak fields, while the other one describes an expulsive field.
Уравнение Эйнштейна (in Russian)
Валерий Борисович Морозов. Parana J. Sci. Educ., v.4, n.1, (6-10), февраль 08, 2018.
DOI: doi.org/10.5281/zenodo.3838182
Абстрактные
Согласно принципам общей теории относительности уравнение гравитационного поля должно содержать энергию поля как источник самого поля. Включение в уравнение Эйнштейна тензора энергии-импульса поля вводит в уравнение лишние неизвестные. Такое уравнение не пригодно для нахождения метрики, но позволяет, зная метрику, вычислить полный тензор энергии-импульса вещества и гравитационного поля. В качестве метрики гравитационного поля можно использовать метрику непрерывного поля, параметры которой, находятся из общековариантного однопараметрического уравнения. Приведены решения уравнения для сферически симметричной, стационарной задачи. Одно из решений практически совпадает для слабых полей с решением Шварцшильда, другое описывает
выталкивающее поле.
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Suresh Kumar Agarwal, Pardis Fazli2 Sufia Zaman and Abhijit Mitra.
Parana J. Sci. Educ., v.4, n.1, (10-15), February 23, 2018.
DOI: doi.org/10.5281/zenodo.3838195
Abstract
The atmospheric carbon dioxide was measured at 18 m above the ground with a Non-Dispersive Infra-Red (NDIR) gas analyzer fitted with a thermometer during 1984 – 2016 at Sagar Island in western part of Indian Sundarbans. The atmospheric carbon dioxide exhibited the lowest value of 384.98 ppm (during premonsoon 1984) to 401.22 ppm (during postmonsoon 2016). The highest peak of air temperature during premonsoon 2009 may be attributed to Aila (a super-cyclone that passed across the lower Gangetic delta during premonsoon 2009). We find overall increasing trends of these two variables, which strongly confirm the rapid rate of industrialization and urbanization in this mangrove dominated ecosystem. The change of land use pattern (due to unplanned expansion of shrimp culture farm at the cost of natural mangroves) is also a strong reason for the local scale rise of atmospheric carbon dioxide as well as air temperature. Massive plantation of mangroves may be an effective road map to get rid of the situation.
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Parana Journal of Science and Education. ISSN 2447-6153