scholarly journals Mechanical and Durability Properties of Portland Limestone Cement (PLC) Incorporated with Nano Calcium Carbonate (CaCO3)

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 905 ◽  
Author(s):  
Lochana Poudyal ◽  
Kushal Adhikari ◽  
Moon Won
Keyword(s):  
Calcium Carbonate ◽  
Environmental Sustainability ◽  
Green Infrastructure ◽  
Durability Properties ◽  
Portland Limestone Cement ◽  
Global Environmental ◽  
Depth Study ◽  
Series Of Experiments ◽  
Limestone Cement ◽  
New Generation

Despite lower environmental impacts, the use of Portland Limestone Cement (PLC) concrete has been limited due to its reduced later age strength and compromised durability properties. This research evaluates the effects of nano calcium carbonate (CaCO3) on the performance of PLC concrete. The study follows a series of experiments on the fresh, hardened, and durability properties of PLC concrete with different replacement rates of nano CaCO3. Incorporation of 1% nano CaCO3 into PLC concrete provided the optimal performance, where the 56 days compressive strength was increased by approximately 7%, and the permeability was reduced by approximately 13% as compared to Ordinary Portland Cement (OPC) concrete. Further, improvements were observed in other durability aspects such as Alkali-Silica Reaction (ASR) and scaling resistance. Additionally, nano CaCO3 has the potential to be produced within the cement plant while utilizing the CO2 emissions from the cement industries. The integration of nanotechnology in PLC concrete thus will help produce a more environment-friendly concrete with enhanced performance. More in-depth study on commercial production of nano CaCO3 thus has the potential to offer a new generation cement—sustainable, economical, and durable cement—leading towards green infrastructure and global environmental sustainability.

Analysis of pre-service teachers’ perception towards the economic, environmental, social and cultural dimensions of Education for Sustainable Development

Think India ◽  
2019 ◽  
Vol 22 (3) ◽  
pp. 972-978
Author(s):  
Manisha Jetly ◽  
Dr. Nandita Singh
Keyword(s):  
Sustainable Development ◽  
Environmental Sustainability ◽  
Qualitative Content Analysis ◽  
Holistic Approach ◽  
Education For Sustainable Development ◽  
Cultural Dimensions ◽  
The Sustainable Development ◽  
Depth Study ◽  
Development Goals ◽  
Class Room

Education for sustainable development (ESD) enjoys a huge momentum worldwide in which the role of teachers for making sustainable development goals a reality has been recognized significantly. Teachers through their knowledge, attitudes and skills can bring the learning about these concepts to the curriculum and class room interaction and are in a position to influence their students. Therefore it is pertinent, that teachers are sensitised towards these issues, so that they prepare and nurture their students for making appropriate and responsible choices which contribute to a sustainable future. At this juncture it becomes crucial to understand their priorities and awareness level in context of the sustainable development. The present research paper aims to analyse the perception of forty post graduate pre-service teachers of the Chandigarh region, towards ESD through the dimensions of economic sustainability, environmental sustainability, social sustainability and cultural sustainability. For this researchers have adopted qualitative content analysis methodology for an in-depth study of the subjective responses through an open ended question. The findings suggest that most of the respondents associated the perception of ESD strongly with environmental sustainability. It is noted that the pre-service teachers lack a holistic approach towards ESD. On the basis of the findings it is recommended that there is an urgent need of integrating the concept of ESD consciously and conscientiously in India’s teacher education programmes.

The Twenty-first Century

2018 ◽  
Author(s):  
Alexander Gillespie
Keyword(s):  
Environmental Sustainability ◽  
First Century ◽  
Bad News ◽  
Good News ◽  
Species Loss ◽  
The Past ◽  
Scientific Terms ◽  
Twenty First Century ◽  
Open Question ◽  
New Generation

The cumulative environmental challenge of sustainable development in the twenty-first century is larger than anything humanity has ever had to deal with in the past. The good news is that solid progress is being reached in the understanding of issues in scientific terms and understanding what needs to be done. The bad news is twofold. First, although many of the environmental problems of earlier centuries are now being confronted, a new generation of difficulties is eclipsing what were the older difficulties. Secondly, much of the progress is being achieved by the wealthier parts of the planet, rather than the developing world. From population growth to climate change to unprecedented habitat and species loss, whether environmental sustainability can be achieved in the twenty-first century is an open question.

scholarly journals China’s plastic import ban increases prospects of environmental impact mitigation of plastic waste trade flow worldwide

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zongguo Wen ◽  
Yiling Xie ◽  
Muhan Chen ◽  
Christian Doh Dinga
Keyword(s):  
Environmental Impact ◽  
Environmental Sustainability ◽  
Trade Flow ◽  
Plastic Waste ◽  
Sharp Decline ◽  
Short Term ◽  
Long Run ◽  
Global Environmental ◽  
Waste Trade ◽  
Treatment Structure

AbstractSince the late 1990s, the trend of plastic waste shipment from developed to developing countries has been increasing. In 2017, China announced an unprecedented ban on its import of most plastic waste, resulting in a sharp decline in global plastic waste trade flow and changes in the treatment structure of countries, whose impacts on global environmental sustainability are enormous but yet unexamined. Here, through the life cycle assessment (LCA) method, we quantified the environmental impacts of changes in the flow patterns and treatment methods of 6 types of plastic waste in 18 countries subsequent to the ban. In the short term, the ban significantly improved four midpoint indicators of environmental impact, albeit contributed to global warming. An annual saving of about 2.35 billion euros of eco-cost was realized, which is equivalent to 56% of plastic waste global trade value in 2017. To achieve global environmental sustainability in the long run, countries should gradually realize the transition from export to domestic management, and from landfill to recycling, which would realize eco-costs savings of about 1.54–3.20 billion euros.

Durability performance of Portland limestone cement mortar containing butyl and zinc stearate admixtures

2021 ◽  
Vol 54 (2) ◽  
Author(s):  
Athanasios Malakopoulos ◽  
Manolis Chatzigeorgiou ◽  
Nikos Boukos ◽  
Athanasios Salifoglou
Keyword(s):  
Cement Mortar ◽  
Zinc Stearate ◽  
Portland Limestone Cement ◽  
Limestone Cement ◽  
Durability Performance

scholarly journals Family leadership and environmental sustainability: a case of the single fathers in Russia

2021 ◽  
Vol 250 ◽  
pp. 07006
Author(s):  
Olga Bezrukova ◽  
Valentina Samoylova ◽  
Maria Yashina
Keyword(s):  
Environmental Sustainability ◽  
Deviant Behavior ◽  
Family Relations ◽  
Reproductive Technologies ◽  
Severe Illness ◽  
Single Fathers ◽  
Global Environmental ◽  
The Family ◽  
Divorce Consequences ◽  
Family Leadership

Nowadays, the traditional perception of the family is changing. However, understanding children preferences and shaping their views of the world still remain the key prerequisites for the environmental sustainability. The purpose of the article is to analyze models of single fatherhood, to study the motivation and structure of factors that determine the involved fatherhood making, the specifics of mother’s and parent family’s influence on the paternal practices implementation. Our research testifies to the fact that single fathers tend to become family leaders and undertake responsibility related to childcare in the context of transforming marital and family relations as well as facing global environmental issues. The results of the study show that single fatherhood is usually a forced situation caused by death or severe illness of the mother, her deviant behavior and leaving the family, deprivation of parental rights, divorce consequences, long-term separation of spouses, use of modern reproductive technologies of surrogacy. It is concluded that the scenarios of the single fatherhood becoming – planned or casual – are associated with the cause of the child appearance in the family. The significant differences are found in the social and cultural capital of the single fathers which might have different impacts on the level of environmental education they can pass on to their children.

scholarly journals Analyzing and Estimating the Performance of Concurrent Kernels Execution on GPUs

2017 ◽  
Author(s):  
Rommel Cruz ◽  
Lucia Drummond ◽  
Esteban Clua ◽  
Cristiana Bentes
Keyword(s):  
Resource Utilization ◽  
Real World ◽  
Power Efficiency ◽  
Necessary Conditions ◽  
Performance Degradation ◽  
Computing Power ◽  
Concurrent Execution ◽  
Depth Study ◽  
New Generation

GPUs have established a new baseline for power efficiency and computing power, delivering larger bandwidth and more computing units in each new generation. Modern GPUs support the concurrent execution of kernels to maximize resource utilization, allowing other kernels to better exploit idle resources. However, the decision on the simultaneous execution of different kernels is made by the hardware, and sometimes GPUs do not allow the execution of blocks from other kernels, even with the availability of resources. In this work, we present an in-depth study on the simultaneous execution of kernels on the GPU. We present the necessary conditions for executing kernels simultaneously, we define the factors that influence competition, and describe a model that can determine performance degradation. Finally, we validate the model using synthetic and real-world kernels with different computation and memory requirements.

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