scholarly journals Fuentes de arena de río de la Provincia de Manabí a utilizar en hormigones en la construcción de obras civiles

2020 ◽  
Vol 5 (1) ◽  
pp. 51
Author(s):  
Ramona Albertina Panchana Cedeño ◽  
Eduardo Humberto Ortiz Hernández ◽  
Wilter Enrique Ruiz Párraga ◽  
María José Calderero Panchana
Keyword(s):  
Comparative Analysis ◽  
Negative Impact ◽  
Surface Resistivity ◽  
San Jose ◽  
Santa Ana ◽  
Resistance Surface ◽  
Coarse Aggregates ◽  
Index Terms ◽  
Del Rio ◽  
Compression Resistance

  Con el fin Establecer fuentes de arena de río de buena calidad de la provincia de Manabí para abaratar costos de transporte de este agregado a utilizar en los hormigones de las construcciones civiles se realizó un análisis comparativo de diseños   de   hormigones   con   resistencia   de 240kg/cm2, utilizando arenas de los cauces de los rio con agregados gruesos de diferente cantera de la Provincia de Manabí. Se empleó arenas de los cauces de diversos ríos como:   Pajan,   Quiroga,   Portoviejo,   Chone, Olmedo. Para los agregados gruesos se tomaron muestras de las canteras Picoazá: San Agustín, Megarok, Grano de Oro, San José y La Chicha del cantón Sucre.  Las combinación de  materiales planteadas para los diseños respectivos son: Cantera San Agustín con arenas del Rio Pajan y Rio Portoviejo, Cantera Megarok con arenas del Rio Quiroga y Rio Portoviejo, Cantera Grano de Oro con arenas del Rio Santa Ana, Cantera San José con arenas del Rio Puca del Cantón Olmedo, además se utilizó Cantera la Chicha con arenas del Rio Chone. Al analizar los resultados se concluyó que las arenas de los ríos de la Provincias de Manabí presentan impureza orgánicas, afectando las resistencias superiores a F’c 240 kg/cm2 a comprensión y mostrando resistividad superficial desfavorables para tener hormigones con durabilidad aceptable.    Palabras claves.- Resistencia de Compresión, Resistividad Superficial, Agregados, Arenas Hormigones, Meandros.   SUMARY In order to  establish good quality sources of sand from rivers in Manabí province to reduce transportation costs of this aggregate  used in concretes for civil constructions, a comparative analysis of concrete designs with a resistance of 240kg / cm2 was performed, using sands from the riverbed with coarse aggregates from different quarries in the Province of Manabí. Sands from various riverbeds such as: Pajan, Quiroga, Portoviejo, Chone, Olmedo were used. For the coarse aggregates, samples were taken from Picoazá’s quarries: San Agustín, Megarok, Grano de Oro, San José, and La Chicha in the canton of Sucre.  The   dose   of   materials   proposed   for   the respective  designs  are:  Cantera  San  Agustín with   sand   from   the   Rio   Pajan   and   Rio Portoviejo, Cantera Megarok with sand from the Rio Quiroga and Rio Portoviejo, Cantera Grano de  Oro  with  sand  from  the  Rio  Santa  Ana, Cantera San José with sand from the Puca River of the Olmedo Canton, Cantera la Chicha was also used with sands from the Chone River. When analyzing the results, it was concluded that the sands of the rivers of the Provinces of Manabí present organic impurity affecting the resistances  superior  to  F’c  240  kg  /  cm2  at compression and this shows unfavorable surface resistivity,  this  has  a  negative  impact  in  the acceptable durability of concretes   Index   Terms.   -   Compression   Resistance, Surface Resistivity, Aggregates Sands, Concrete, Meander.

scholarly journals Estudio comparativo de resistencias de hormigón de 240kg/cm2 usando los agregados finos, entre el rio Portoviejo y el rio Chone de la Provincia de Manabí.

2020 ◽  
Vol 5 (1) ◽  
pp. 35
Author(s):  
Eduardo Humberto Ortiz Hernández ◽  
Jimmy Jeffrey García Vínces ◽  
César Mauricio Jarre Castro ◽  
Raúl Vinicio Hidalgo Zambrano
Keyword(s):  
Coarse Aggregate ◽  
Surface Resistivity ◽  
Fine Aggregate ◽  
Resistance Surface ◽  
Design Alternatives ◽  
Concrete Cylinders ◽  
Index Terms ◽  
Del Rio ◽  
Compression Resistance ◽  
Two Sectors

Se realizó un análisis comparativo de materiales en un diseño de hormigón, usando  agregado  grueso  procedentes de la Cantera Megarok y San Agustín perteneciente a la Parroquia  Picoaza, con el uso de agregado fino de  dos sectores del rio Portoviejo. El otro agregado grueso que se utilizo fue de la Cantera la Chicha y para agregado  fino del rio Chone. En donde se compararon sus propiedades físicas mecánicas  de los materiales. Se plantearon tres alternativas de diseños para saber cuál aporta mayores resistencias es decir  las arenas de los ríos Portoviejo del Sector el Cady hasta el Puente San Ignacio, el rio   Lodana hasta el Pollo   y en Chone el sector Puente Olimpo hasta el sector Las Banderas, adicionalmente se comparó el agregado grueso entre las canteras Picoaza y la Chicha. Se tomaron muestras  de arena de tres meandros en cada rio, y con cada diseño se elaboraron 6 cilindros de hormigón para cada meandro probándolos a los 7, 14, y 28 días. Al analizar los resultados se concluye que las arenas finas de los dos sectores del   río Portoviejo  y el rio Chone no cumplen para su   utilización como agregado fino para hormigones de resistencias superiores a  F’c 240 kg/cm2 y al realizar el ensayo de resistividad superficial, se obtuvo valores no favorables.   Palabras claves - Resistencia de Compresión, Resistividad Superficial, Modulo de Finura. Hormigones, Arenas, Meandros.   Abstract A comparative analysis of materials was carried out in a concrete design, using coarse aggregate from the Megarok and San agustin Quarry belonging to Picoazá Parish, with the use of fine aggregate from two sectors of Portoviejo’s River. The other coarse aggregate that was used is from the La Chicha Quarry, and for fine aggregate  from  Chone’s  River.  Where  their physical mechanical properties of the materials were compared. Three design alternatives were proposed to know which one contributes the greatest resistance, that is, the sands of Portoviejo’s rivers, from the El Cady sector to the San Ignacio Bridge, the Lodana River to the Pollo, and in Chone, from the Olimpo Bridge to the Las Banderas sector, additionally the coarse aggregate between the quarries Picoazá and La Chicha where compared. Sand samples were taken from three meanders in each river, and with each design 6 concrete cylinders were made for each meander, testing them at 7, 14, and 28 days. When analyzing the results, it is concluded that the fine sands of the two sectors of Portoviejo’s River, and the Chone’s River; do not comply for their use as a fine aggregate for concretes with resistance  greater  than  F’c  240  kg/cm2  and when the surface resistivity test where made, unfavorable values were obtained. Index Terms - Compression Resistance, Surface Resistivity, Fineness Module, Concrete, Sands, Meander.

A comparative analysis of the anthropogenic impact and user-pays principle availability in the model areas of the Russian Federation

2020 ◽  
Vol 18 (9) ◽  
pp. 1787-1798
Author(s):  
S.N. Ayusheeva
Keyword(s):  
Environmental Management ◽  
Comparative Analysis ◽  
Russian Federation ◽  
Natural Environment ◽  
Anthropogenic Impact ◽  
Negative Impact ◽  
Economic Behavior ◽  
Environmental Investment ◽  
The Russian Federation ◽  
Comparative Systems

Subject. This article assesses the effectiveness of the existing system of environmental management based on the user-pays principle in terms of reducing the negative impact on the environment. Objectives. The article aims to conduct a comparative analysis of the anthropogenic impact on natural environment components and deficiency payments for pollution in the model areas of the Russian Federation. Methods. For the study, I used the methods of computational, comparative, systems, and structural analyses. Results. Based on the ecological rating of the Russian Federation subjects, the article defines model areas, assesses the degree of anthropogenic impact on the basis of pollution relative rates, and describes the particularities of environmental investment in the selected areas. Conclusions. The system of payments for pollution does not affect the economic behavior of economic entities.

scholarly journals Use of diesel and emulsified diesel in CI engine: A comparative analysis of engine characteristics

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110209
Author(s):  
Zain Ul Hassan ◽  
Muhammad Usman ◽  
Muhammad Asim ◽  
Ali Hussain Kazim ◽  
Muhammad Farooq ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Water Injection ◽  
Load Range ◽  
Performance And Emission ◽  
Injection Methods ◽  
Ci Engine ◽  
Ci Engines

Despite a number of efforts to evaluate the utility of water-diesel emulsions (WED) in CI engine to improve its performance and reduce its emissions in search of alternative fuels to combat the higher prices and depleting resources of fossil fuels, no consistent results are available. Additionally, the noise emissions in the case of WED are not thoroughly discussed which motivated this research to analyze the performance and emission characteristics of WED. Brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) were calculated at 1600 rpm within 15%–75% of the load range. Similarly, the contents of NOx, CO, and HC, and level of noise and smoke were measured varying the percentage of water from 2% to 10% gradually for all values of loads. BTE in the case of water emulsified diesel was decreased gradually as the percentage of water increased accompanied by a gradual increase in BSFC. Thus, WED10 showed a maximum 13.08% lower value of BTE while BSFC was increased by 32.28%. However, NOx emissions (21.8%) and smoke (48%) were also reduced significantly in the case of WED10 along with an increase in the emissions of HC and CO and noise. The comparative analysis showed that the emulsified diesel can significantly reduce the emission of NOx and smoke, but it has a negative impact on the performance characteristics and HC, CO, and noise emissions which can be mitigated by trying more fuels variations such as biodiesel and using different water injection methods to decrease dependency on fossil fuels and improve the environmental impacts of CI engines.

scholarly journals Análisis de la calidad de varios cuerpos de agua superficiales en el GAM y la Península de Osa utilizando el Índice Holandés

2012 ◽  
Vol 25 (5) ◽  
pp. 37 ◽  
Author(s):  
Guillermo Calvo Brenes ◽  
Jesús Mora Molina
Keyword(s):  
Costa Rica ◽  
San Jose ◽  
Del Rio

<p>A pesar de la cantidad de ríos que tiene Costa Rica, la mayoría muestra algún grado de contaminación. Por lo tanto, resultan de particular interés aquellos que forman parte de la Gran Área Metropolitana, en donde se concentra el 70% de la población del país.</p> <p>Si bien la calidad del agua se puede determinar por medio del análisis de distintos indicadores, es ventajosa su simplificación por medio del uso de índices de calidad del agua. Uno de los índices adoptados en Costa Rica es el “Índice holandés de valoración de la calidad del agua” (ICA holandés), el cual se basa en el uso de tres indicadores: la demanda bioquímica de oxígeno, el nitrógeno amoniacal y el oxígeno disuelto, este último expresado como porcentaje de saturación de oxígeno.</p> <p>En el presente estudio se analizaron estos indicadores en diez ríos localizados en las provincias de San José, Alajuela, Heredia y Cartago, así como en la Península de Osa. Además, para correlacionar el ICA holandés con la densidad poblacional, se muestrearon tres puntos en cada río: la zona alta cercana a la naciente del río, la zona media y la zona baja, ubicada cerca de la desembocadura del río.</p> <p>Se encontró que los ríos que atraviesan las ciudades altamente densas, las cuales poseen densidades poblacionales superiores a los 8000 habitantes por kilómetro cuadrado (hab/km<span>2</span>), muestran niveles de contaminación en los ríos de “severa” a “muy severa”; por otra parte, lugares con densidades poblacionales entre los 3000-8000 hab/km<span>2</span>, en general, muestran niveles de contaminación de “moderada” a “severa”; mientras que los poblados con menos de 1000 hab/ km<span>2 </span>causan que la calidad de las aguas presente un nivel de contaminación de “incipiente” a “no contaminada”. Estos resultados pueden variar dependiendo del caudal de los ríos, su recorrido total y el uso que se le dé a la tierra.</p> <p>El análisis de Regresión Lineal Univariable mostró una correlación positiva entre el ICA holandés y la densidad poblacional, y utiliza un nivel de probabilidad del 95%.</p>

Public-private partnerships: A profitability analysis of the partnerships in the energy sector in Albania

2021 ◽  
Author(s):  
Kostandin Nasto ◽  
Junada Sulillari
Keyword(s):  
Comparative Analysis ◽  
Negative Impact ◽  
Energy Sector ◽  
Future Generations ◽  
Public Private Partnerships ◽  
Public Finances ◽  
Profitability Analysis ◽  
The Future ◽  
The Government ◽  
The Cost

The aim of this study is to realize an analysis of public-private partnerships (PPPs) in Albania. Our focus will mainly be the PPPs in the energy sector. Public-private partnerships contracts have experienced a significant increase in the last decades in Albania. They have had a great impact on public finances of the country, this is why they have often been “attacked” for the negative impact that they might have on the actual and especially the future of the country. We will work to make a comparative analysis of the cost and benefits that Albania has had from signing these contracts. We will also work to analyze the management of these public-private partnerships during the pandemics, which will be helpful to reveal the possible difficulties that the government might have in managing them. Something that has inspired us to make a deeper analysis of them is related to the energy crises that the country has experienced in the last years. We want to “dig” deeper in order to see if these PPPs are really worth it or not. Is it worth or it brings a burden for the actual and future generations of Albania?

A Comparative Analysis of Drivers of Secondary Market Liquidity in Financial Markets for Investment Analysis

2019 ◽  
pp. 340-366
Author(s):  
Hakki Karatas ◽  
Nildag Basak Ceylan ◽  
Ayhan Kapusuzoglu
Keyword(s):  
Comparative Analysis ◽  
Stock Markets ◽  
Global Financial Crisis ◽  
Negative Impact ◽  
Bond Market ◽  
Secondary Market ◽  
Market Liquidity ◽  
Investment Analysis ◽  
Secondary Bond ◽  
The Impact

The purpose of this chapter is to examine the drivers of secondary bond market and stock market liquidity for investment analysis after global financial crisis in Turkey. The literature in Turkey mainly focuses only on the volatility of return for driving liquidity in both bond and stock markets. However, it is argued that other types of volatilities including domestic and international volatilities have also a deteriorating impact on secondary market liquidity in Turkey. In this context, it is empirically tested whether the volatility and/or uncertainty that stem from the FED and ECB policies within the last 10 years had a negative impact on liquidity both in government bond and stock markets. Moreover, the impact of non-residents in bond and stock markets on secondary market liquidity is examined by including their holdings in stock and bond market.

“Made Me Feel Connected”: A Qualitative Comparative Analysis of Intimate Partner Violence Routine Screening Pathways to Impact

2019 ◽  
Vol 26 (3-4) ◽  
pp. 334-358 ◽  
Author(s):  
Jo Spangaro ◽  
Jane Koziol-McLain ◽  
Alison Rutherford ◽  
Anthony B. Zwi
Keyword(s):  
Intimate Partner Violence ◽  
Comparative Analysis ◽  
Continuity Of Care ◽  
Partner Violence ◽  
Negative Impact ◽  
Positive Impact ◽  
Qualitative Comparative Analysis ◽  
Intimate Partner ◽  
Routine Screening ◽  
Abused Women

Intimate partner violence (IPV) routine screening is widely implemented, yet the evidence for pathways to impact remains unclear. Of the 32 abused women interviewed 16 weeks after antenatal IPV screening, 24 reported positive impact, six reported nil positive impact, and two reported negative impact. Using qualitative comparative analysis (QCA), key conditions for positive impact were care in asking, and support and validation from the midwife. Lack of these and lack of continuity of care were relevant to nil positive impact. Benefits included naming the abuse, connection, unburdening, taking steps to safety, and enabling informed care. Disclosure was not required for positive impact.

scholarly journals Alignment of business in robotic process automation

2019 ◽  
Vol 3 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Ning Zhang ◽  
Bo Liu
Keyword(s):  
Comparative Analysis ◽  
Design Methodology ◽  
Negative Impact ◽  
Qualitative Comparative Analysis ◽  
Process Automation ◽  
Content Type ◽  
Robotic Process Automation ◽  
Business Alignment ◽  
Practical Implications

Purpose This paper aims to find out how business aligns with robotic process automation (RPA) and whether the alignment has the same factors as for IT–business alignment. Design/Methodology/Approach Condition configurations for positive and negative impact for business alignment with RPA. Findings The positive and negative configurations that possibly impact business alignment with RPA. Research limitations/implications There are some human instincts during conditions dichotomization and limited number of cases. Practical implications The findings can be used to guide practice application in real industry. Originality/value This paper adopted crisp-set qualitative comparative analysis to find condition configurations for alignment of business and RPA for more generalization.

ALTERNATIVA DE INTERVENCIÓN URBANA EN LA MARGEN DERECHA DEL RÍO PORTOVIEJO

2018 ◽  
Vol 2 (2) ◽  
pp. 129-144
Author(s):  
Miguel Perfecto Terán García ◽  
Francisco Segundo Ponce Reyes ◽  
Marcos Rigoberto Gallo Zambrano ◽  
José Luis Castro Mero
Keyword(s):  
Urban Landscape ◽  
Human Beings ◽  
Strategic Decisions ◽  
San Jose ◽  
Use Of Resources ◽  
Urban Intervention ◽  
Urban Planning And Design ◽  
Improper Use ◽  
Del Rio ◽  
The Right

Es de gran trascendencia conocer la manera en que los seres humanos se apropian, edifican y representan la relación del espacio con el medio ambiente en la tierra y el uso indiscriminado de recursos que dañan la ecología; existen  directrices principales sobre las decisiones estratégicas de desarrollo para la intervención urbana, que a través de políticas públicas se ordene, administre y compense de una manera óptima, minimizar los riesgos y amenazas bióticas, físicas y económico sociales sobre la utilidad de estas riquezas naturales de forma planificada. Esta investigación tiene como objetivo diseñar una alternativa de intervención urbana de una parte de la margen derecha del río Portoviejo, que atraviesa la ciudad; en el tramo comprendido entre el puente San José y el Puente Velasco Ibarra, donde se encuentra ubicada el área de estudio. La   metodología utilizada es cualitativa, descriptiva y experimental; mediante la aplicación diagnósticos realizados a través de encuestas, observaciones y análisis documental, para obtener información, verificar, analizar, corregir o aplicar el conocimiento la vida cotidiana y la prognosis e imagen del objetivo en planos. Los resultados de carácter preventivo, contribuyen a evitar las continuas invasiones de edificaciones en las riberas del río y el uso indebido de los patios traseros de los predios que están en este tramo donde los cerramientos están ubicado muy cerca del cauce del río, para la utilización de estos espacios que están dirigidos a la recreación  de la población, y a mejorar el paisaje natural urbano a partir de un desarrollo sostenible y  conservación natural de las riberas del ríos.Palabras clave: alternativa, intervención urbana, desarrollo sustentableURBAN INTERVENTION ALTERNATIVE ON THE RIGHT BANK OF THE PORTOVIEJO RIVER.ABSTRACTIt is a current problem of great importance to know the way in which human beings appropriate, build and represent the relationship of space with the environment on earth and the indiscriminate use of resources that damage the ecology; there are main guidelines on the strategic decisions of development for urban intervention, which through public policies is ordered, managed and compensated in an optimal way to minimize the risks and biotic, physical and economic social threats on the utility of these natural riches in a way planned The objective of this research is to design an alternative proposal for the urban intervention of a part of the right bank of the Portoviejo River, which crosses the city and is the stretch between the San José Bridge and the Velasco Ibarra Bridge, where the area is located study. The methodology used is qualitative, descriptive and experimental through diagnoses made through surveys, observations and documentary analysis, to obtain important information to understand, verify, analyze, correct or apply knowledge in daily life and the prognosis and image of the objective in blueprints. The results of the proposal for urban planning and design are preventive in order to avoid the invasion of buildings on the banks of the river and the improper use of the backyards of the properties that are in this section where the enclosures are located very close to the river bed, which will allow a better use of these spaces that are specifically aimed at the recreation of the population, and improve the natural urban landscape from sustainable development and natural conservation of the riverbanks.Keywords:  alternative, development, urban, intervention, sustainable

Monitoring of Pollutions of Atmosphere in Conditions of Big Industrial Town on the Exhample of Togliatti

2019 ◽  
Vol 23 (6) ◽  
pp. 38-40
Author(s):  
A.V. Vasilyev
Keyword(s):  
Air Pollution ◽  
Comparative Analysis ◽  
Negative Impact ◽  
Ecological Monitoring ◽  
The State ◽  
Exhaust Gases ◽  
Industrial Town ◽  
Air Pollutions

Results of ecological monitoring of air pollution in conditions of big industrial town on the example of Togliatti town are submitted. On the basis of measurements and calculations results of comparative analysis of negative impact of industrial air pollutions and exhaust gases of automobile transport to the state of atmosphere of Togliatti town was carried out. In total results of researches are allowing to conclude that the main source of air pollution is automobile transport.

Sign in / Sign up

Export Citation Format

Share Document