Corrosion of tension wires in bonded post-tensioned concrete beams accelerates fatigue damage accumulation and shortens fatigue lifespan significantly. In this article, the fatigue behavior of post-tensioned concrete beams is studied experimentally under varying strand corrosion levels and high cyclic loading. An ac-celerated corrosion test is conducted in order to acquire varied corroded beam specimens. First, eight test beams were designed, and one of them was statically tested. Furthermore, the fatigue amplitude was determined using static test results. The remaining seven beams with various corrosion degrees were subjected to constant ampli-tude high cyclic fatigue loading tests...........

Keywords: Post-tensioned concrete, Corrosion level, Fatigue fracture, Corrosion induced cracking

[1]. Djeddi, L., et al., Reliability of acoustic emission as a technique to detect corrosion and stress corrosion cracking on prestressing steel strands. International Journal of electrochemical science, 2013. 8(6): p. 8356-8370.
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This article introduces the special issue on "Blood–Brain Barrier and Epilepsy." We review briefly current understanding of the structure and function of the blood–brain barrier (BBB), including its development and normal physiology, and ways in which it can be affected in pathology. The BBB formed by the endothelium of cerebral blood vessels is one of three main barrier sites protecting the central nervous system (CNS). The barrier is not a rigid structure, but a dynamic interface with a range of interrelated functions, resulting from extremely effective tight junctions, transendothelial transport systems, enzymes, and regulation of leukocyte permeation, which thereby generates the physical, transport, enzymatic, and immune regulatory functions of the BBB............

Keywords: Blood–brain barrier, Brain diseases, Neurovascular unit

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Human activates are one of the main driving forces of land use and land cover changes and generally in natural environment. These changes largely driven by population growth urban expansion, increasing demand for food , fodder, fuel and all changing socio-economic conditions. Land information is important for effective sustainable land resource management, effective utilization of natural resources and use as a tool for planning, monitoring, evaluation of development, industrial activity and reclamation. Remote sensing with its ability of synoptic viewing together with GIS field observation can be used as important tool for inventorying, periodic updating, monitoring and assessment, planning and development of these land resources s in different agro climatic regions............

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Slow sand filtration is a long-established technique for improving the biological and physical quality of water. In its standard form, water is passed at about 200mm/hours down through a bed of sand about one meter deep. For use in rural communities in Akwa Ibom State, a much cheaper and therefore shallower filter is required and one must accommodate the intermittent flow corresponding to water being drawn off for a few minutes several times a day. Sand used in slow sand filters should have an effective size of 0.15 - 0.35mm and a uniformity coefficient of 1.5 - 3, however less than 2 is desirable. This paper examines how slow-sand filtration could actually be used to improve drinking water qualities in rural areas. Site visitation was carried out and samples of sand and gravel were obtained. Sieve analysis was performed on the sand and gravel samples and a physio-chemical analysis of the raw water and filtered water was performed. Results showed reductions in faecal coliform count of about 95% in the filtered water. Recommendations on appropriate filter operation and maintenance were made.

KEYWORDS: biological, coliform, filtration, physio-chemical, Sieve.

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Background: Brazil is the world's second largest producer of papaya, behind Mexico and India, respectively. Among the main consumers of Brazilian fruit are the United States, England, Germany and Portugal. The species Carica papaya is the most cultivated in the world. However, papaya is constantly infested and attacked by diseases and pests. Materials and Methods: The experiment was carried out in experimental area of papaya, cultivated with the species Carica papaya of the formosa group, belonging to the Experimental Farm of CEUNES / UFES in São Mateus – ES, Brazil.. The experiment was conducted in a 4 x 2 x 2 factorial scheme, with two distances (10, 20, 30 and 40 cm), two faces (exposed face and the back of the fruit near the stem) two spray systems (Electrostatic system connected and off) and four replicates,.........

KEYWORDS: Carica Papaya, Application distance, Spray

[1]. Empresa Brasileira de Pesquisa Agropecuária – EMBRAPA. Disponível em: <https://www.embrapa.br/mandioca-e-fruticultura/cultivos/mamao>. Acess em: 17 jan. 2022.
[2]. Confederação da Agricultura e Pecuária do Brasil – CNA. Disponível em: < http://www.cnabrasil.org.br/noticias/o-municipio-de-linhares-no-espirito-santo-e-modelo-na-producao-de-mamao-no-pais >. Acesso em: 19 set. 2021.
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