scholarly journals Diseño y fabricación de un prototipo a escala de una cámara con variación de humedad y temperatura para curado de concretos de activación alcalina elaborados a partir de mezclas de escoria siderúrgica y cenizas volantes

Respuestas ◽  
2018 ◽  
Vol 23 (1) ◽  
pp. 45
Author(s):  
Carlos Daniel Hernández-Montiel ◽  
William Arnulfo Aperador-Chaparro ◽  
Manuel Jonathan Pinzón Cárdenas ◽  
Jhon Wilmar Cárdenas-Pulido

ResumenEl estudio realizado da a conocer el diseño y fabricación de un prototipo modular a escala, de una cámara con variación de humedad y temperatura para curado de concretos de activación alcalina; elaborado a partir de mezclas de escoria siderúrgica y cenizas volantes, para ser montado directamente en obra; el estudio beneficia al sector industrial en el desarrollo de nuevos proyectos a dado que permite  mejorar el desempeño, reducir riesgos y costos de transporte en los procesos de fabricación de los materiales que se presentan en la actualidad. El dispositivo requiere de la integración de distintos elementos mecánicos y electrónicos junto con conocimientos en el área del control y la programación para su correcto funcionamiento, además, es necesario un grado de precisión para garantizar niveles óptimos de resistencia en los diferentes tipos de concreto por activación alcalina, a partir del diseño y la buena elección de los materiales en la fabricación de la cámara. Palabras clave: curado, humedad, temperatura, modular, concreto, escoria, cenizaAbstractThrough this document, the design and manufacture of a prototype of a chamber with humidity and temperature variations for curing alkaline activation concretes made from mixtures of steel slag and flying ash is presented, to be mounted directly on site, this benefits the industrial sector in the development of new projects by improving performance, reducing risks and transportation costs in the manufacturing processes of these materials that are currently present. The device requires the integration of distinct mechanical and electronic elements along with knowledge in the control and programming area for its correct operation, with the degree of precision necessary to guarantee optimal levels of resistance in the different types of concrete by alkaline activation, emanating from the design and the right choice of materials for the construction of the chamber.Keywords: curing, humidity, temperature, modular, concrete, slag, ashResumoO estudo realizado revela o projeto e fabricação de um protótipo modular em escala, de uma câmara com variação de umidade e temperatura para a cura de concretos alcalinos ativados; feito de misturas de escória de aço e cinza volante, para ser montado diretamente no local; O estudo beneficia o setor industrial no desenvolvimento de novos projetos, pois permite melhorar o desempenho, reduzir riscos e custos de transporte nos processos de fabricação dos materiais que são apresentados hoje. O dispositivo requer a integração de diferentes elementos mecânicos e eletrônicos, juntamente com o conhecimento na área de controle e programação para operação adequada, além disso, um grau de precisão é necessário para garantir níveis ótimos de resistência em diferentes tipos de concreto por ativação alcalina, a partir do design e da boa escolha de materiais na fabricação da câmeraPalabras chave: 

Author(s):  
Igor Cândido de Freitas ◽  
Bluma Guenther Soares ◽  
Elisangela Pereira Cordeiro

The mixtures containing polypropylene are used in the industrial sector as material for bags, chairs, household items, and can even be used in cell phone batteries. The interest in creating this material is due to its low density compared to more common materials such as iron and ceramic, in addition to its good corrosion resistance and reasonable mechanical properties in environments without high temperature and pressure. In order to diversify the mechanical and viscous properties, different types of polymers were used, such as lactic polyacid, which has beneficial properties for recycling such as degradation. It is a challenge to control the right proportion and use additives and plasticizers to control the desired properties. The methods used to measure the properties of polypropylene and polylactic acid mixtures with different types of additives, compatibilizers and plasticizers were DMA, TGA, tensile, DSC and rheology tests following ASTM standards. The results were promising, observing different mechanical and viscosity properties for the PP/PLA/PP-g-MA/D mixture in different proportions. Thus concluding that the different products have varied application in the industry.


Land ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 311
Author(s):  
Anna Granath Hansson ◽  
Peter Ekbäck ◽  
Jenny Paulsson

This paper aims to elucidate the sliding scale between usufruct and ownership by applying a property rights framework to three Swedish forms of tenure in multifamily housing. The framework deconstructs the bundles of rights of rental, tenant-ownership and ownership to highlight commonalities and differences connected to the right to use and exclude, the right to transfer and the right to the value. It is concluded that the three tenure forms have many traits in common but that there are distinct differences in some areas, most notably in connection to the right to the value. The property rights framework applied in the study may be applicable also on a general level as a method to analyze and compare tenures of different types in different countries. Further, ways to improve the framework and cover more facets of outcomes of property rights patterns are suggested.


2014 ◽  
Vol 96 (2) ◽  
Author(s):  
Dominik Perler

Abstract:According to Spinoza, there is no categorical distinction between human and non-human animals: they all belong to the same nature and all consist of bodies with corresponding ideas. This thesis gives rise to two problems. How is it possible to distinguish different types of animals, in particular nonrational and rational ones, if all of them have the same metaphysical structure? And why does Spinoza nevertheless claim that human beings have a privileged status that gives them the right to use non-rational animals? This paper examines these two problems, arguing that the solution to both of them lies in Spinoza’s all-embracing naturalism.


10.6036/10173 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 335-337
Author(s):  
JUAN AURELIO TAMAYO ◽  
JAVIER GAMERO ROJAS ◽  
JUAN ANTONIO MARTINEZ ROMAN ◽  
MARIA DE LORETO DELGADO GONZALEZ

A measure is proposed to estimate the degree of digital transformation of a social system that could be applied to different units of analysis: the organization, the industrial sector or society. The measure contemplates the existence of classic (non-digital) social systems, a transition stage and the transformation towards the digital social system. An estimate of the percentage of people who have made purchases over the Internet has been used to estimate the degree of digital transformation of different territories, regions and countries included in the INE and Eurostat statistics. The initially proposed function can serve as a basis to include panels of indicators or multiple parameters that diagnose other relevant aspects of society and the economy. In general, the measure could be useful to assess the transition and evolution of different types of systems.


Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1847 ◽  
Author(s):  
K. Chau ◽  
Gaolu Zou

A majority of energy is consumed to control the indoor environment for human activities and industrial production. The demand for energies for these two uses are reflected in demand for different types of real estate and the volume of industrial outputs. The purpose of this study is to examine the long-run equilibrium and short-run dynamics between real energy prices and demand for different types of real estate and industrial output in China. Energy prices are measured in the real price of fuels and power. Demand for different types of real estate is measured in their sales volume in the first hand market, that is, floor areas of new real estate sold by developers. Industrial output is measured by the net output (value added) of the industrial sector. All data series were tested for stationarity (i.e., the existence of a unit root) before testing for a co-integration relationship. We found no long-term equilibrium relationship between energy prices and the demand for real estate and industrial output as predicted by theory, probably due to increased supply of energy efficient buildings. There is also no short-run relationship between energy prices and demand for housing due to the increase in vacancy rate resulting from speculative demand for housing. However, demand for commercial properties appeared to lead energy prices. Finally, there is strong evidence suggesting that an increase in energy prices will significantly reduce industrial output but not vice versa.


2016 ◽  
Vol 19 (3) ◽  
pp. 432-439
Author(s):  
Melville Saayman ◽  
Waldo Krugell ◽  
Andrea Saayman

The Cape Argus Pick n Pay Cycle Tour is a major event on the road cycling calendar. The majority of cyclists travel significant distances and participation produces a substantial carbon footprint. This paper examines participants’ willingness to pay to offset their carbon footprint. The purpose of this paper is to make a contribution to the literature by linking willingness to pay to attitudes towards or beliefs (green views) about the initiatives in place, to ensure a greener cycle tour. Factor analysis is used to identify different types of cyclists, based on their green views: those with green money, those who prefer green products and the “re-cyclers”. The results of the regression analysis reveal that socio-demographic variables and the right attitude towards the environment are significant predictors of stated willingness to pay for climate change mitigation.


2018 ◽  
Vol 25 (4) ◽  
pp. 3-7
Author(s):  
Piotr Tabor ◽  
Czesław Urbanik ◽  
Andrzej Mastalerz

Abstract Introduction. The aim of this study was to determine the correlations between the direction and velocity of the ball in volleyball spike. We adopted the hypothesis that the direction of an attack is dependent upon the arrangement of the pectoral girdles in the phase of flight. Material and methods. The research was carried out for four different types of attacks: from the left side of the court down the line (A) and in the cross-court direction (B) and from the right side in the same directions (C and D). Sixteen young volleyball players from a Sports Championship School run by the Polish Volleyball Federation were examined. Results. The analysis of the results showed different ball velocities in different attacks. The velocity was the lowest in attack B and the highest in attack D. Conclusions. The direction of attack was produced by hitting the ball in a non-central manner and by aligning the glenohumeral joints diagonally to the net.


2021 ◽  
Author(s):  
Rozita Mirmotalebi

As the number of web services is increasing on the web, selecting the proper web service is becoming a more and more difficult task. How to make the selection results from a list of services more customized towards users’ personal preferences and help users identify the right services for their personal needs becomes especially important under this context. In this thesis, we propose a novel User Modeling approach to generate user profiles on their non-functional preferences on web services, and then apply the generated profiles to the ranking process in order to make personalized selection results. The User Modeling system is based on both implicit and explicit information from the user. Also, this is a flexible model to include different types of non-functional properties. We performed experiments using a real web service dataset with values on various non-functional properties to show the accuracy of our system.


2021 ◽  
Vol 1 (1) ◽  
pp. 1-7
Author(s):  
Yayan Andriani

In Indonesia, there is a wide variety of product innovations related to activities carried out by the community by promoting the marketing process. This development is also related to the matters of companies that compete with various innovations in developing their business to be more advanced. In a business, a lot of considerations are needed so that the profit or profit obtained is more than the capital spent but the quality is still prioritized. One of them is in marketing research which is a place for providers of products or goods to be traded. Market and Marketing Aspects are needed so that the buying and selling process can run smoothly and for transactions. It can be seen how vital the Market and Marketing Aspects are in a business. Where in a business this aspect is the most essential aspect. Market and Marketing Aspects are used in marketing methods in which you can find out how much demand there is so that the business runs properly. Many competitors that occur in the market make a study of the marketing aspects necessary to reduce things that can harm the company. The right marketing position will make the company get the desired profit. In marketing research, also states that there are various methods that can be used in society to support the economy by prioritizing innovative products, but problems in product innovation must be constraints with business capital and advantages or disadvantages, with the COVID-19 pandemic problem with the industrial sector experiencing a decline. Which is very drastic, thereby reducing the innovation that will be carried out.


2019 ◽  
Author(s):  
Motonori Yamaguchi

The need of typewriting skill is ever increasing in our lives. The prevalence of personal computers and mobile devices has transformed the way people communicate with each other. Although many different types of human interfaces have been introduced over the decades, the dominant form of computer interface remains to be that of typing on a keyboard. [...] Whilst typing has become one of the common everyday skills within the last two decades, experimental psychologists have been studying it as a research subject for more than a hundred years. [...] Apart from its practical importance in the modern lifestyle, the act of typing involves the right amount of complexity as well as well-defined and measurable actions. These features of typewriting makes it an ideal testbed to gain our understanding of the control and acquisition of complex skills. This review article first presents a brief overview of the classic studies of typewriting skill in the early 20th century, discusses the developments that took place after the mid-20th century, and concludes with the current status and issues that remain for future investigations in the 21st century.


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