scholarly journals Characterization of Used Lubricant Oil in a Latin-American Medium-Size City and Analysis of Options for Its Regeneration

Recycling ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 10
Author(s):  
Carlos Sánchez-Alvarracín ◽  
Jessica Criollo-Bravo ◽  
Daniela Albuja-Arias ◽  
Fernando García-Ávila ◽  
M. Raúl Pelaez-Samaniego
Keyword(s):  
United Arab Emirates ◽  
Latin American ◽  
Medium Size ◽  
Used Oil ◽  
Lubricant Oil ◽  
Metal Contents ◽  
Finishing Process ◽  
Filtration Step ◽  
American Cities

Petroleum-derived products, such as lubricant oils, are non-renewable resources that, after use, must be collected and processed properly to avoid negative environmental impacts. A circular economy of used oils requires the re-refining and reuse of the same. Similar to most countries in Latin America, the management of used oils in Ecuador is still incipient and few cities collect and treat this material properly. In Cuenca, the ETAPA company collects ~1344 t/year of used oils, which are subjected to pretreatment operations prior to their use as fuel in a cement factory. However, combustion generates polluting gases and disallows the adding of value to the used oils. The lack of studies on the characterization and methods utilized for recovering used oils under the conditions found in medium-size Latin-American cities (e.g., Cuenca), alongside a lack of government policies, have hindered the adoption of re-refining operations. The objective of this work is to characterize the used lubricant oils in Cuenca, to compare them with the properties of used oils from other countries, and to suggest some re-refining technologies for oils with similar properties. Used oil samples were collected from mechanic shops and car-lubricating shops for characterization. Its physicochemical properties and metal contents are comparable to the used oils in other countries globally. Specifically, the flash point, kinematic viscosity, TBN, and concentrations of Zn, Cd, and Mg are similar to the properties of used oils in Iraq, Egypt, and the United Arab Emirates. Based on these results, the best re-refining option for used oils in Cuenca is extraction with solvents in which sedimentation and dehydration (already conducted in Cuenca) is followed by a solvent reaction process, a vacuum distillation process, a finishing process with bentonite, and a final filtration step.

Calidad de vida, buen vivir y salud. Indígenas en la ciudad: el caso de 6 pueblos migrantes en Bogotá

2021 ◽  
Author(s):  
Sandra Vargas-Cruz ◽  
◽  
Irene Parra-García
Keyword(s):  
Indigenous Peoples ◽  
Latin American ◽  
Indigenous Studies ◽  
Health It ◽  
Buen Vivir ◽  
Calidad De Vida ◽  
The Common ◽  
American Cities ◽  
The City

The work addresses the situation of six migrant indigenous peoples who currently reside in the city of Bogotá: Los Pastos, Misak misak, Wounaan, Yanacona, Nasa and Kamëntšá biya. An interdisciplinary team developed the work; due to this, the phenomenon is analysed from dierent approaches, although with a special emphasis on health. It constitutes a reflection on the condition of being indigenous in Latin American cities from the redefinition of identities, through the challenges for the guarantee of rights outside their territories, to the reasons for migration and the characterization of the migrant indigenous’ households in the city. The book includes components of the broad discussion on indigenous studies and the common situations that they may experience when settling in Bogotá, and the importance of making visible the specific experience of each people participating in the study.

scholarly journals Lubricant Oil Bioremediation by Rhodococcus erythropolis Bacteria and Indigenous Bacteria Isolated from Water Contaminated with Lubricant Oil

2020 ◽  
Vol 7 (1) ◽  
pp. 62-74
Author(s):  
Frentina Murti Sujadi ◽  
Yahya Yahya ◽  
Andi Kurniawan ◽  
Abd. Aziz Amin
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Rhodococcus Erythropolis ◽  
Polluted Water ◽  
Oil Contamination ◽  
Indigenous Bacteria ◽  
Used Oil ◽  
Lubricant Oil ◽  
Degrading Bacteria ◽  
Oil Concentration

The bioremediation system can be improved by using specific bacterial potential as oil-degrading bacteria which microorganisms can use hydrocarbons as a carbon source for their metabolic processes. The aim of this study is to identify R. erythropolis on degradation oil contamination and to obtain indigenous bacteria as new agent bacteria on bioremediation of oil contamination. The polluted water samples from used oil were taken from PPN Prigi, Trenggalek, East Java, Indonesia. The parameters considered were the detection and characterization of indigenous bacteria that degraded used oil. The density of bacteria was analyzed in the interval time of days 0, 2, 4, 6 and 7 and TPH was analyzed at final incubation. The results of this study indicate that the effectiveness of reducing oil concentration was used in testing the potential of bacteria from the highest was Pseudomonas aeruginosa which as indigenous bacteria isolated from water contaminated sites with application cell rate 1×108 cells/ml. It reduced of oil concentration up to 53%, and 1×106 cells/ml reduced oil concentration up to 47%. While, R. erythropolis with application cell rate 1×108 cells/ml reduced 47%. This result was found that Pseudomonas aeruginosa was effectively removed of oil concentration.

Review on Job Satisfaction, Intention to Leave and Corporate Entrepreneurial Characteristics in United Arab Emirates’ Construction Firms

2017 ◽  
Vol 6 (10) ◽  
pp. 105
Author(s):  
Basma Kashmoola ◽  
Fais Ahmad ◽  
Yeoh Khar Kheng
Keyword(s):  
Job Satisfaction ◽  
United Arab Emirates ◽  
Intent To Leave ◽  
Supply And Demand ◽  
Intention To Leave ◽  
Work Load ◽  
Tourism Industry ◽  
Medium Size ◽  
Construction Companies ◽  
Developed Economies

Recently construction companies and real state of SMEs sector of Dubai, reported that they have a combine shortfall of skilled staff of up to 500,000.  In addition to that, recently tourism industry of UAE, one of the most dominating service sectors also reported the severe shortage of qualified hospitality staffs. The shortage of workforce in the industry is one of the major causes of unfair distribution of work load and also an unjust compensation and reward system in the overall industry.  The supply and demand of workforces is also one of the crucial predictor factors for job satisfaction and may lead to quit their job or to migration.While examining the various factors that may affect employee’s intention to leave, many research findings confirmed that job satisfaction caused the highest variance on to leaving intention.  To get the deeper analysis of the job satisfaction and its impact on employee’s intention to leave, many researchers argued that there were many facets of job satisfaction that may cause the leaving intentions and therefore job satisfaction has been considered a variables composed of multiple factors. It is evident that there are many studies had been conducted to examine the relationship between job satisfaction and employees leaving intentions. However, not many studies on the same line have been fully addressed in small and medium size firms in UAE working setting and also most of the studies sampling strategies had focused in industries in developed economies.  Therefore, it is believed to be a gap in the literature in the context of the job satisfaction and intent to leave in SMEs.

Women's Empowerment in Latin American Cities and Its Influence on Mortality

2020 ◽  
Author(s):  
Ana Ortigoza ◽  
Ariela Braverman ◽  
Philipp Hessel ◽  
Vanessa Di Cecco ◽  
Amélia Augusta Friche ◽  
...  
Keyword(s):  
Latin American ◽  
Women's Empowerment ◽  
Women’S Empowerment ◽  
American Cities

Mortality Amenable to Health Care in Latin American Cities: Examining Between-Country Variation in Amenable Mortality and the Potential Role of Urban Metrics

2020 ◽  
Author(s):  
Pricila Mullachery ◽  
Daniel A. Rodriguez ◽  
J. Jaime Miranda ◽  
Nancy Lopez-Olmedo ◽  
Kevin Martinez-Folgar ◽  
...  
Keyword(s):  
Health Care ◽  
Latin American ◽  
Potential Role ◽  
Amenable Mortality ◽  
Urban Metrics ◽  
American Cities

Pollen characterization of ornamental species of Mammillaria Haw. (Cactaceae/Cactoideae)

2019 ◽  
Vol 6 (1) ◽  
pp. 13 ◽  
Author(s):  
Denise M. D. S. Mouga ◽  
Gabriel R. Schroeder ◽  
Nilton P. Vieira Junior ◽  
Enderlei Dec
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Radial Symmetry ◽  
Morphological Data ◽  
Medium Size ◽  
Ornamental Species

The pollen morphology of thirteen species of Cactaceae was studied: M. backebergiana F.G. Buchenau, M. decipiens Scheidw, M. elongata DC, M. gracilis Pfeiff., M. hahniana Werderm., M. marksiana Krainz, M. matudae Bravo, M. nejapensis R.T. Craig & E.Y. Dawson, M. nivosa Link ex Pfeiff., M. plumosa F.A.C. Weber, M. prolifera (Mill.) Haw, M. spinosissima var. “A Peak” Lem. and M. voburnensis Scheer. All analysed pollen grains are monads, with radial symmetry, medium size (M. gracilis, M. marksiana, M. prolifera, large), tricolpates (dimorphs in M. plumosa [3-6 colpus] and M. prolifera [3-6 colpus]), with circular-subcircular amb (quadrangular in M. prolifera and M. plumosa with six colpus). The pollen grains presented differences in relation to the shape and exine thickness. The exine was microechinate and microperforated. The pollen morphological data are unpublished and will aid in studies that use pollen samples. These pollen grains indicate ornamental cacti.

scholarly journals Educational inequalities in obesity: a multilevel analysis of survey data from cities in Latin America

2021 ◽  
pp. 1-9
Author(s):  
Mónica Mazariegos ◽  
Amy H Auchincloss ◽  
Ariela Braverman-Bronstein ◽  
María F Kroker-Lobos ◽  
Manuel Ramírez-Zea ◽  
...  
Keyword(s):  
Higher Education ◽  
Economic Development ◽  
Survey Data ◽  
Latin American ◽  
Effect Modification ◽  
University Education ◽  
Educational Inequalities ◽  
Obesity Prevalence ◽  
Socio Economic Development ◽  
American Cities

Abstract Objective: Using newly harmonised individual-level data on health and socio-economic environments in Latin American cities (from the Salud Urbana en América Latina (SALURBAL) study), we assessed the association between obesity and education levels and explored potential effect modification of this association by city-level socio-economic development. Design: This cross-sectional study used survey data collected between 2002 and 2017. Absolute and relative educational inequalities in obesity (BMI ≥ 30 kg/m2, derived from measured weight and height) were calculated first. Then, a two-level mixed-effects logistic regression was run to test for effect modification of the education–obesity association by city-level socio-economic development. All analyses were stratified by sex. Setting: One hundred seventy-six Latin American cities within eight countries (Brazil, Chile, Colombia, Costa Rica, El Salvador, Guatemala, Mexico and Peru). Participants: 53 186 adults aged >18 years old. Results: Among women, 25 % were living with obesity and obesity was negatively associated with educational level (higher education–lower obesity) and this pattern was consistent across city-level socio-economic development. Among men, 18 % were living with obesity and there was a positive association between education and obesity (higher education–higher obesity) for men living in cities with lower levels of development, whereas for those living in cities with higher levels of development, the pattern was inverted and university education was protective of obesity. Conclusions: Among women, education was protective of obesity regardless, whereas among men, it was only protective in cities with higher levels of development. These divergent results suggest the need for sex- and city-specific interventions to reduce obesity prevalence and inequalities.

Latin American Cities and Regions

2021 ◽  
pp. 43-63
Author(s):  
Guillermo Jajamovich, ◽  
Oscar Sosa López, and ◽  
Gabriel Silvestre
Keyword(s):  
Latin American ◽  
American Cities

scholarly journals Analysis of Urban Transformation Through the Use of Expanded Research Tools

SAGE Open ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 215824402110383
Author(s):  
Ana Elena Builes-Vélez ◽  
Lina María Suárez Velásquez ◽  
Leonardo Correa Velásquez ◽  
Diana Carolina Gutiérrez Aristizábal
Keyword(s):  
Latin American ◽  
Urban Studies ◽  
Development Process ◽  
Urban Transformation ◽  
Urban Spaces ◽  
Design Development ◽  
New Methods ◽  
The Social ◽  
American Cities ◽  
Research Tools

In recent years, urban design development has been an important topic in Latin American cities such as Medellín due to the transformation of their urban spaces, along with the new methods used to evaluate the social, morphological, and, in some cases, economic impacts that have been brought about by the urban development projects. When inquiring about the development process and impact of urban studies, and the inhabitants’ relation to a transformed space, it is important to establish the context within which images, drawings, and photographs are analyzed, using graphical approaches triangulated with other research methods to define comparative criteria. In this article, we reflect on the expanded use of various research tools for the analysis of urban transformation, taking with reference the experience lived by a group of researchers in two Latin American cities. From this, it is intended to understand how they work and how they allow us to understand the urban transformation of these cities, the data obtained, and the vision of the researchers.

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