v.11 n.2 April

Solution to the matter-antimatter asymmetry problem

Stefan Bernhard Rüster

Parana J. Sci. Educ., v.11, n.2, (1-4),  April 1, 2025.

DOI: 10.5281/zenodo.15089221

Abstract

The matter-antimatter asymmetry problem is solved by simply considering the number densities of various species of non-interacting massive fermions and antifermions, the equations of which are presented and explained in this article in the context of the evolution of the universe. Their respective number densities depend on temperature and also on chemical potential of the respective species. Of great importance here is the change in sign of the non-zero chemical potential of the respective fermion species as well as the dipping in temperature of the matter due to the expansion of the universe when comparing the equations of the number densities of fermions and antifermions of the respective species. This explains the initially slight and later significant predominance of fermions over antifermions in cosmic evolution as well as the almost complete disappearance of antimatter in today’s universe.

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Application of Python-Based Streamlit App for Evaluating Growth and Feed Efficiency in Pterophyllum scalare

Suvadeep Samanta, Arpita Saha, Prosenjit Pramanick, Sufia Zaman, and Abhijit Mitra

Parana J. Sci. Educ., v.11, n.2, (5-12),  April 1, 2025.

DOI: 10.5281/zenodo.15089112

Abstract

This study investigates the Condition Index (CI) and Feed Conversion Ratio (FCR) of Angel Fish (Pterophyllum scalare) cultured under two different feeding conditions over an eight-month rearing period. Two types of feed were utilized namely traditional fish feed and alternative feed incorporating Black Soldier Fly (BSF) larvae. This study assessed the impact of these diets on fish growth, health, and feed efficiency considering CI and FCR as proxies. Used a Python Streamlit app for calculations related to CI and FCR.  The findings suggest significant differences in CI and FCR between the two groups, providing insights into sustainable and cost-effective aquaculture practices.

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Повышающий трансформатор (Обзор)

Step-up transformer (Review) 

Суханов Владимир Николаевич

Vladimir Nikolaevich Sukhanov

Parana J. Sci. Educ., v.11, n.2, (13-17),  April  1, 2025.

DOI: 10.5281/zenodo.15089162

Abstract

The operation of new electrical step–up transformer is based on the principle of induction of electromotive force in an electrical conductor surrounded by a magnetic circuit. The new design of the transformer with a semiconductor secondary winding is presented. Such a trans-former, for all its traditional simplicity, has an arbitrarily large transformation ratio.

Абстрактный

Работа нового электрического повышающего трансформатора основана на принципе индукции электродвижущей силы в электрическом проводнике, окруженном магнитной цепью. Представлена новая конструкция трансформатора с полупроводниковой вторичной обмоткой. Такой трансформатор, при всей своей традиционной простоте, имеет сколь угодно большой коэффициент трансформации.

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Impact of a Healthcare Model on Universal Access and Service Delivery for Migrant Populations in Colombia

Fernando Andres Duarte Villamil and Lauro Figueroa Valverde

Parana J. Sci. Educ., v.11, n.2, (18-28),  April 1, 2025.

DOI: 10.5281/zenodo.15089206

Abstract

The global escalation of the migration crisis in recent years, rooted in complex factors such as high unemployment rates, widespread insecurity, and inadequate healthcare systems, has revealed significant systemic weaknesses. Migrant populations face distinct challenges within the healthcare sectors of host countries, often intensifying the existing pressures on health systems and leading to a deterioration in the quality of care. In Colombia, a specialized healthcare model has been established to meet the needs of the migrant population; however, its sustainability requires substantial and ongoing investment to adequately respond to the growing demand.This study critically examines the efficacy of Colombia’s healthcare model, particularly focusing on the services most frequently utilized by migrants, with the objective of validating a minimum service package that ensures access to healthcare. The data indicate that Colombia’s health system has allocated over 924 million dollars to healthcare services for foreign nationals within a one-year period, underscoring the significant financial strain placed on the system. The research highlights the urgent necessity of developing a tailored benefit plan specifically designed to address the healthcare needs of the migrant population, thus formalizing targeted health actions that promote public health for both migrants and residents within Colombia. In conclusion, while the current healthcare model provides access to fundamental services, including procedural care, emergency treatments, medical consultations, and hospitalizations, there is a pressing need for further strategic interventions. These measures are crucial to ensuring a comprehensive, equitable, and financially sustainable healthcare framework that not only meets the specific needs of the migrant population but also alleviates the economic pressures on the Colombian healthcare system, ultimately protecting the health of all individuals residing within the national territory.

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Carbon Capture Potential of Peat Soils in the Abandoned Shrimp Farms of Indian Sundarbans: A Three-Decade Assessment

Saswati Chakraborty, Rajrupa Ghosh, Sufia Zaman, and Abhijit Mitra.

Parana J. Sci. Educ., v.11, n.2, (29-36),  April 1, 2025.

DOI: 10.5281/zenodo.15104019

Abstract

The present study explores the carbon sequestration potential of peat soils within abandoned shrimp farms undergoing mangrove restoration in the Indian Sundarbans. Two stations, Chemaguri and Sagar Island (South), were selected due to historical shrimp farming practices. The study measures Soil Organic Carbon (SOC) using the standard protocol over a 30-year timeline — 1992 (initiation of restoration phase), 2002 (10 years post-restoration), 2012 (20 years post-restoration) and 2022 (30 years post-restoration). SOC levels increased significantly from 0.93% to 3.02% at Chemaguri and from 0.84% to 2.97% at Sagar Island (South), indicating considerable carbon recovery due to afforestation. The findings underscore the importance of ecological restoration in reversing soil degradation and promoting carbon capture.

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