132 research outputs found
Technical and economic pre-feasibility study for the construction of septic tank-filter-sinkhole with alternative material
Received: February 2nd, 2021 ; Accepted: August 3rd, 2021 ; Published: August 24th, 2021 ; Correspondence: [email protected] study of the different materials used in the construction of septic tanks aims to
facilitate and spread the use of this sewage treatment system in places that are not assisted by
municipal sewage systems and in the rural area, which despite having a smaller number of
inhabitants compared to the urban area This study aims to carry out a technical and economic
evaluation of the concrete and tires using in the construction of septic tanks-filter-sinkhole. The
wastewater treatment systems were built according to the recommendations in NBR 7229/93 and
13969/97. To evaluate the efficiency of each system built, the following parameters were
analyzed: chemical oxygen demand (COD), the potential of hydrogen (pH), alkalinity, acidity,
and temperature. In the economic evaluation, the materials and labor required to install the
systems were considered using the Brazilian cost database (SINAPI), and an economic and
financial feasibility study was carried out. According to the technical and economic analysis of
construction, both systems showed the same technical performance, however, the concrete design
proved to be more advantageous than the tire design, considering the difficulty in acquiring the
tires and the high cost if it is necessary to buy them, in addition to the greater difficulty in handling
and installing the tire system compared to the concrete one
Bibliometric analysis on the use of natural fibers in construction materials
Received: February 2nd, 2021 ; Accepted: August 3rd, 2021 ; Published: August 30th, 2021 ; Correspondence: [email protected] to the increasing interest of the population in the sustainability theme, there was
a consequent growth in publications related to the theme in the area of civil construction. Agroindustrial waste has become an environmental problem, and with that natural fibers have found
space in the reuse of waste due to its characteristics and possibilities of improving the mechanical
properties of its products. In order to achieve sustainable construction demand, along with the
need to reuse waste, studies have begun to analyze the application of natural fibers in construction
materials. The documents provided by the Web of Science (WOS) database through research
carried out with the search for the terms âNatural Fibersâ and âBuilding materialsâ restricted to
the period 2010â2020 in the main WOS collection. The institutions involved with the
publications, the countries of origin of the documents, the year of publication, the keywords used
by the authors and the number of citations for each document were analyzed using bibliometrics
in the VOSVIEWER (VOS) software. The result of the analysis shows an increase in documents
related to the theme over the years, and that the countries with the most studies in the area are
China (16), USA (14) and Brazil (11), respectively. The results presented after analysis of the
keywords show that natural fiber (61 occurrences), mechanical properties (44 occurrences) and
composites (31 occurrences) are the words with the highest occurrence among the analyzed
documents. The present study shows the growth of research related to the theme, in addition to
discriminating countries, institutions and authors, which allows monitoring the scientific
expansion of the theme and guiding future studies
Reação De HĂbridos De Citros Ă Inoculação Com Alternaria Alternate
Alternaria brown spot (ABS), caused by Alternaria alternata, which produces a host-specific toxin (HST), is a very important disease in mandarin orchards worldwide. This disease affects mandarin, their hybrids and grapefruits. The main varieties cultivated in Brazil, Ponkan mandarin and Murcott tangor, are highly susceptible to the fungus, which is also an alternative saprophyte that reproduces in the orchards and has its spores easily spread by the wind. For this study, citrus hybrids obtained from directed crossing were selected for their agronomic traits, which make them potential new varieties of sweet orange and mandarins both for industrial citriculture and for fresh fruit market. These hybrids were evaluated for their response to ABS by means of A. alternata inoculation in vitro and in vivo, an indispensible step for the release of new varieties. More than 30 genotypes that were resistant or had few symptoms of the disease were selected. Selection of varieties resistant to the disease is of great economic importance, since it reduces the production costs, rather increased due to chemical control, and also contributes to the inoculum decrease in the field. © 2016, Universidade Estadual Paulista (UNESP). All rights reserved.42431332
Imagens e sentidos no discurso da mĂdia impressa acerca de uma epidemia de intoxicação ocupacional por benzeno
STORAGE OF PITOMBEIRA SEEDS [Talisia esculenta (A. St. Hil) Radlk - SAPINDACEAE] IN DIFFERENT ENVIRONMENTS AND PACKAGINGS
The small foreigner: new laws will promote the introduction of non-native zooplankton in Brazilian aquatic environments
Stomatal behavior and components of the antioxidative system in coffee plants under water stress
Physiological changes in osmo and hydroprimed cucumber seeds germinated in biosaline water
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