scholarly journals Numerical analysis of a tire shredder machine to produce rubber particulate material

2021 ◽  
Vol 2139 (1) ◽  
pp. 012005
Author(s):  
R A García-León ◽  
H Y Jaramillo ◽  
J A Gómez-Camperos
Keyword(s):  
Numerical Analysis ◽  
Low Cost ◽  
Particulate Material ◽  
Raw Material ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Mechanical And Physical Properties ◽  
Design Software ◽  
Design Theories ◽  
And Performance

Abstract The main objective of this work is to develop a numerical analysis of a shredder machine to generate rubber particulate material for its implementation in different sectors such as construction, artisanal, and road as aggregates in the raw material. As part of the methodology, modern design theories were considered to select the materials for the different elements of the crushing machine; for this purpose, the SolidWorks design software was used to obtain a conceptual design model of the prototype. The mathematical and numerical results indicate that the prototype of the crushing machine will work in good conditions, always guaranteeing high levels of safety and performance based on the mechanical and physical properties of the materials selected through the design theories. Likewise, this machine will be low-cost to promote growth and competitive capacity for studies of different products with rubber aggregates to solve global environmental problems. Finally, the physical behavior of the new materials can be obtained with rubber particles aggregate will allow evaluating and optimizing a different kind of products that can be used in different sectors aiding sustainability sources.

scholarly journals The Role of Green Recruitment and Selection on Performance of Processing Industries in Tanzania: A Case of Tanzania Tobacco Processors Limited (TTPL)

2018 ◽  
Vol 8 (4) ◽  
pp. 35 ◽  
Author(s):  
Kelvin M Mwita ◽  
Stella Malangalila Kinemo
Keyword(s):  
Organizational Performance ◽  
Environmental Sustainability ◽  
Environmental Conservation ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Job Candidates ◽  
And Performance ◽  
Recruitment And Selection ◽  
Green Human Resource Management

Environmental conservation has been a concern to many international, local organizations and individuals for Centuries. Green management initiatives become an important factor in forward-thinking business around the world as a means of combating environmental degradation caused by organizations. Industrialization has contributed to the global environmental problems we are witnessing today and Tanzania industrialization drive cannot ignore this fact. Research is one of best ways for investigating, understanding and solving problems.  Although number of researches has been done on Green Human Resource Management (Green HRM), still there is no sufficient literature on the subject. To bridge this gap this study investigated the role of green recruitment and selection on performance of Processing Industries in Tanzania by using Tanzania Tobacco Processors Limited (TTPL) as a case study. The study sough to specifically assess the application of green recruitment and selection at TTPL, determining whether green recruitment and selection attract more and better job candidates, and establishing the relationship between green recruitment and selection and organizational performance. It was found that green recruitment and selection practices are in place and they contribute in attracting more qualified job candidates. The study also found a linear relationship between green recruitment and selection and performance. Further, the study recommends institutionalization of green recruitment and selection and other green HRM practices in order improve organizational performance. Regulatory and statutory bodies are recommended to ensure that green practices are put in place by organizations for organizational and environmental sustainability.

scholarly journals Properties of Foamed Lightweight High-Performance Phosphogypsum-Based Ternary System Binder

2020 ◽  
Vol 10 (18) ◽  
pp. 6222 ◽  
Author(s):  
Girts Bumanis ◽  
Jelizaveta Zorica ◽  
Diana Bajare
Keyword(s):  
Ternary System ◽  
High Performance ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Mineralogical Composition ◽  
Point Of View ◽  
Raw Material ◽  
Total Energy Consumption ◽  
And Performance

The potential of phosphogypsum (PG) as secondary raw material in construction industry is high if compared to other raw materials from the point of view of availability, total energy consumption, and CO2 emissions created during material processing. This work investigates a green hydraulic ternary system binder based on waste phosphogypsum (PG) for the development of sustainable high-performance construction materials. Moreover, a simple, reproducible, and low-cost manufacture is followed by reaching PG utilization up to 50 wt.% of the binder. Commercial gypsum plaster was used for comparison. High-performance binder was obtained and on a basis of it foamed lightweight material was developed. Low water-binder ratio mixture compositions were prepared. Binder paste, mortar, and foamed binder were used for sample preparation. Chemical, mineralogical composition and performance of the binder were evaluated. Results indicate that the used waste may be successfully employed to produce high-performance binder pastes and even mortars with a compression strength up to 90 MPa. With the use of foaming agent, lightweight (370–700 kg/m3) foam concrete was produced with a thermal conductivity from 0.086 to 0.153 W/mK. Water tightness (softening coefficient) of such foamed material was 0.5–0.64. Proposed approach represents a viable solution to reduce the environmental footprint associated with waste disposal.

scholarly journals Physical, Mechanical and Durability Properties of Soil Building Blocks Reinforced with Synthetic Fibre

2018 ◽  
Vol 7 (3.12) ◽  
pp. 201
Author(s):  
S Selsiadevi ◽  
Evangelin Ramani Sujatha
Keyword(s):  
Synthetic Fibre ◽  
Low Cost ◽  
Building Blocks ◽  
Linear Shrinkage ◽  
Raw Material ◽  
Durability Properties ◽  
Earth Construction ◽  
Erosion Test ◽  
Earth Blocks ◽  
And Performance

Earth construction is the most economic way to solve housing problems, particularly in case of low cost building, with the limitation of resources. The simplicity in production of earth blocks justifies by the availability of soil as raw material and by the less energy in production. Generally, fibre inclusion increases the strength and performance of the earth blocks. Synthetic fibre such as AR glass fibre, polypropylene fibre were used and investigated experimentally with different percentages of fibre 0.25 %, 0.50 %, 0.75 % and 1 % by weight of earth. A sequence of test was conducted with and without addition of fibre to soil building blocks. Physical properties, mechanical properties and durability properties specifically density test, water absorption by capillarity test, linear shrinkage, compressive test, indirect tensile stress, wearing test and erosion test were conducted and compared with different fibre ratio to determine the optimum fibre content in each mix order to produce blocks that will provide the maximum strength. 

scholarly journals DEVELOPMENT OF ECOLOGICAL DENIM BLEACHING METHODS

2021 ◽  
Vol 2021 ◽  
pp. 81-87
Author(s):  
I. İvedi ◽  
K. Yağci ◽  
E. Tağaç
Keyword(s):  
Sodium Hypochlorite ◽  
Coming Out ◽  
Textile Industry ◽  
Sodium Metabisulfite ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Waste Load ◽  
Water Cloud ◽  
And Performance ◽  
The Cost

Although the textile industry has many products to offer to humanity, it consumes a lot of energy and indirectly causes greenhouse gas emissions. With increasing environmental awareness, parameters such as the cost and performance of each industrial activity to society, as well as the use of natural resources and the possibility of causing global environmental problems to have become more frequently considered factors. In the denim bleaching process, the desired effect is usually obtained with the help of sodium hypochlorite. Sodium metabisulfite is then used for the neutralization process. Since these processes are carried out at high liquor ratios, the waste load resulting from the consumption of necessary chemicals and water is also high. In this study, ecological bleaching methods have been developed as an alternative to the conventional sodium hypochlorite bleaching method by reducing the use of water and chemicals with low liquor and spraying bleaching methods. Denim garments subjected to bleaching with low liquor and spraying methods were compared with denim garments applied to sodium hypochlorite bleaching in industrial washing machines according to exhaustion method. In the spraying method, the mixture coming out of the narrow nozzle is mixed with the compressed air by means of a specially designed spray gun and sprayed in very small droplets. Thus, a good atomization is ensured, and a low liquor ratio water cloud is created.

Ecological Limits and the Meaning of Freedom: A Defense of Liberty as Non-Domination

2017 ◽  
Vol 3 (3) ◽  
pp. 33-49 ◽  
Author(s):  
Augustin Fragnière
Keyword(s):  
Conceptual Analysis ◽  
Environmental Policies ◽  
Environmental Constraints ◽  
Political Arena ◽  
Individual Liberty ◽  
Philosophical Debate ◽  
Political Issues ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Two Alternatives

It is now widely acknowledged that global environmental problems raise pressing social and political issues, but relatively little philosophical attention has been paid to their bearing on the concept of liberty. This must surprise us, because the question of whether environmental policies are at odds with individual liberty is bound to be controversial in the political arena. First, this article explains why a thorough philosophical debate about the relation between liberty and environmental constraints is needed. Second, based on Philip Pettit’s typology of liberty, it assesses how different conceptions of liberty fare in a context of stringent ecological limits. Indeed, a simple conceptual analysis shows that some conceptions of liberty are more compatible than others with such limits, and with the policies necessary to avoid overshooting them. The article concludes that Pettit’s conception of liberty as non-domination is more compatible with the existence of stringent ecological limits than the two alternatives considered.

Programmable Integrated Photonics

2020 ◽  
Author(s):  
José Capmany ◽  
Daniel Pérez
Keyword(s):  
Integrated Circuit ◽  
Performance Monitoring ◽  
Low Cost ◽  
Limiting Factors ◽  
External Control ◽  
Integrated Photonics ◽  
New Paradigm ◽  
Photonic Integrated Circuit ◽  
And Performance ◽  
Application Fields

Programmable Integrated Photonics (PIP) is a new paradigm that aims at designing common integrated optical hardware configurations, which by suitable programming can implement a variety of functionalities that, in turn, can be exploited as basic operations in many application fields. Programmability enables by means of external control signals both chip reconfiguration for multifunction operation as well as chip stabilization against non-ideal operation due to fluctuations in environmental conditions and fabrication errors. Programming also allows activating parts of the chip, which are not essential for the implementation of a given functionality but can be of help in reducing noise levels through the diversion of undesired reflections. After some years where the Application Specific Photonic Integrated Circuit (ASPIC) paradigm has completely dominated the field of integrated optics, there is an increasing interest in PIP justified by the surge of a number of emerging applications that are and will be calling for true flexibility, reconfigurability as well as low-cost, compact and low-power consuming devices. This book aims to provide a comprehensive introduction to this emergent field covering aspects that range from the basic aspects of technologies and building photonic component blocks to the design alternatives and principles of complex programmable photonics circuits, their limiting factors, techniques for characterization and performance monitoring/control and their salient applications both in the classical as well as in the quantum information fields. The book concentrates and focuses mainly on the distinctive features of programmable photonics as compared to more traditional ASPIC approaches.

Theoretical Ecology

2007 ◽  
Keyword(s):  
Spatial Dynamics ◽  
Theory And Practice ◽  
The Novel ◽  
Basic Principles ◽  
Theoretical Ecology ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Interacting Populations ◽  
Novel Material ◽  
Ecological Science

Robert May's seminal book has played a central role in the development of ecological science. Originally published in 1976, this influential text has overseen the transition of ecology from an observational and descriptive subject to one with a solid conceptual core. Indeed, it is a testament to its influence that a great deal of the novel material presented in the earlier editions has now been incorporated into standard undergraduate textbooks. It is now a quarter of a century since the publication of the second edition, and a thorough revision is timely. Theoretical Ecology provides a succinct, up-to-date overview of the field set in the context of applications, thereby bridging the traditional division of theory and practice. It describes the recent advances in our understanding of how interacting populations of plants and animals change over time and space, in response to natural or human-created disturbance. In an integrated way, initial chapters give an account of the basic principles governing the structure, function, and temporal and spatial dynamics of populations and communities of plants and animals. Later chapters outline applications of these ideas to practical issues including fisheries, infectious diseases, tomorrow's food supplies, climate change, and conservation biology. Throughout the book, emphasis is placed on questions which as yet remain unanswered. The editors have invited the top scientists in the field to collaborate with the next generation of theoretical ecologists. The result is an accessible, advanced textbook suitable for senior undergraduate and graduate level students as well as researchers in the fields of ecology, mathematical biology, environmental and resources management. It will also be of interest to the general reader seeking a better understanding of a range of global environmental problems.

Is There a Future for Bourgeois Liberalism?

2019 ◽  
pp. 109-129
Author(s):  
Robert J. Antonio
Keyword(s):  
Capital Accumulation ◽  
Free Market ◽  
Political Legitimacy ◽  
Corporate Scandals ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Free Market Capitalism ◽  
Formal Rationality ◽  
Bourgeois Culture ◽  
Neoliberal Restructuring

Distinguished by extreme, systematized rationalism, Weber argued, bourgeois culture makes the social world in some ways more predictable and more comfortable but precludes a widely shared good life and social justice. He stressed emphatically that free-market capitalism, by maximizing formal rationality oriented to capital accounting and profitability, produces substantively “irrational” consequences that undermine the sociocultural and material fabric needed to sustain it. More than forty years of neoliberal restructuring, designed to accelerate capital accumulation at almost any cost, has generated massive corporate scandals, extreme economic inequalities, and global environmental problems that threaten its political legitimacy and social and ecological foundations. This chapter explores how Weber anticipated the types of substantive irrationalities suffered by today’s neoliberal regimes.

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