Review
Environmental Sciences
Mathilde Rosenberg Johansen, Thomas Budde Christensen, Tiffany Marilou Ramos, Kristian Syberg
Summary: Although plastic is widely used, the linear economy poses risks to human health. The circular plastic economy aims to reduce, reuse, and recycle all plastic across the value chain. Current literature focuses heavily on the end-of-life phase, neglecting other phases and highlighting challenges such as waste stream contamination and limitations on recycling and reusing plastic. Collaboration and systemic transparency are needed for a successful transition to a circular economy.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Linlin Lu, Wei Fan, Shengbo Ge, Rock Keey Liew, Yang Shi, Hao Dou, Shujuan Wang, Su Shiung Lam
Summary: This paper reviews the current progress of recycling and reuse of waste silk, which is a result of the improvements in living standards and the throw away culture of mankind. The utilization of waste silk in various applications, such as energy, fabric, composites, skincare, biological tissue engineering, filtration, and electronics, is explored. The modification, optimization, and application of regenerated silk fibroin extracted from waste silk show great potential for industrialization and sustainable development. Furthermore, making waste silk functional and intelligently wearable provides two promising ways for recycling waste silk with low cost and high return value. The recovery and utilization of waste silk serve as a paradigm for valorization of other fiber-based waste materials.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Energy & Fuels
Anita Sharma, Ruturaj J. Sawant, Abhishek Sharma, Jyeshtharaj B. Joshi, Rakesh Kumar Jain, Rajkumar Kasilingam
Summary: The present study focused on analyzing waste tires through pyrolysis to extract valuable products. By examining the properties of recovered carbon black (rCB) and oil, both were found to be commercially viable products, with rCB being suitable for rubber compounding. Incorporating rCB into rubber products showed an increase in tensile strength and tear strength properties.
Article
Green & Sustainable Science & Technology
Thomas Budde Christensen
Summary: Designing circular economy policies and planning approaches in cities is an emerging research field. This article aims to analyze how municipalities can support and facilitate the circular economy through various governance forms. By collaborating with local stakeholders, municipalities can play an important role in driving the transition towards a circular economy.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Hanna Salmenpera, Kati Pitkanen, Petrus Kautto, Laura Saikku
Summary: The study shows that different actors in promoting the circular economy face varying obstacles, and promoting material value retention in cycles can be achieved through better sharing of waste-related data and increased dialogue and cooperation among key players.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Katarina Novakovic, Deepashree Thumbarathy, Marloes Peeters, Mark Geoghegan, Josephine Go Jefferies, Chris Hicks, Danae Manika, Sheng Dai
Summary: Interest in recycling is high, but plastic packaging waste recycling rate has stagnated. New approaches are needed to overcome existing limitations. Proposing the use of specific types of plastic for packaging and efficient separation of individual types for recycling.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Article
Engineering, Environmental
Ting Chen, Yingying Zhao, Xiaopeng Qiu, Xiaoyan Zhu, Xiaojie Liu, Jun Yin, Dongsheng Shen, Huajun Feng
Summary: This study examines the economic benefits of food waste treatment projects in China, finding limited economic benefits for facilities that rely on government subsidies. Factors such as regional location and processing techniques exert varying impacts on the economy of food waste treatment, highlighting the need to prioritize service population size and processing techniques in economic decision-making and management.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Engineering, Environmental
Lewis Jones, Rosa Urbano Gutierrez
Summary: The UK ceramics industry is facing significant challenges in transitioning to a circular economy and achieving net zero emissions. The lack of detailed information on UK mineral waste availability, distribution, composition, and their impact on emissions is a major barrier. This study maps the UK's current mineral waste and evaluates their potential for ceramics applications, focusing on reducing firing temperature and process emissions, as well as considering processing demands and opportunity costs. It aims to provide a tool for producers to make informed decisions in reducing raw material usage and transitioning towards net zero emissions.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Green & Sustainable Science & Technology
Ryan Woodard
Summary: This paper investigates the management of waste from SMEs in England, revealing a significant number of businesses illegally using household waste services. Analysis of household waste shows a considerable amount of recyclable and biodegradable materials that could be diverted from disposal through recycling programs. The study provides pioneering estimates of the level of business waste abuse of household services and offers recommendations for improved management.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Rizwan Rasheed, Asfra Rizwan, Hajra Javed, Faiza Sharif, Abdullah Yasar, Amtul Bari Tabinda, Yusra Mahfooz, Sajid Rashid Ahmed, Yuehong Su
Summary: This study analyzes the environmental sustainability and economic benefits of e-waste management in developing economies like Pakistan. It finds that efficient recycling of e-waste can significantly reduce the impact on natural resources. Increasing material weight recovery indicators can bring substantial economic benefits to Pakistan.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Green & Sustainable Science & Technology
Phemelo Tamasiga, Taghi Miri, Helen Onyeaka, Abarasi Hart
Summary: This study examines the trends and patterns in food waste and circular economy using bibliometric review technique. Through the analysis of publications, eight broad themes are identified, emphasizing the importance of promoting collaboration and quantifying food waste and greenhouse gas emissions. The study also highlights the need to investigate the implementation of circularity in developing countries.
Article
Engineering, Environmental
Gwenny Thomassen, Steven Van Passel, Luc Alaerts, Jo Dewulf
Summary: The management of post-consumer plastic packaging waste in Flanders was analyzed using material flow analysis. The study found that the mass recovery rate increased from 0% in 1985 to 31% in 2019, and could be further increased depending on improvement scenarios. The calculation rules and differentiation of secondary applications had a significant impact on the mass recovery rate. Achieving the recycling target of 65% by 2023 will be challenging if strict calculation methods are followed and best-case collection scenarios are not implemented. Clear calculation rules and a harmonized monitoring system are necessary for harmonizing targets.
Article
Environmental Sciences
Vilma Havas, Jannike Falk-Andersson, Paritosh Deshpande
Summary: This article emphasizes the importance of circular economy strategies in addressing waste management challenges, and proposes the concept of "Small Circles" and a new circularity indicator to account for the negative environmental impacts of waste trade. The application of the Small Circles approach is illustrated through case examples of plastic waste management.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Editorial Material
Chemistry, Multidisciplinary
Arthur J. Ragauskas, George W. Huber, Jia Wang, Adam Guss, Hugh M. O'Neill, Carol Sze Ki Lin, Yanqin Wang, Frederik R. Wurm, Xianzhi Meng
Summary: The Editorial highlights the urgent efforts being made by chemists to address challenges related to the fate of plastics at the end of their useful lives and the valorization of plastic waste.
Article
Business
Nagendra Kumar Sharma, Kannan Govindan, Kuei Kuei Lai, Wen Kuo Chen, Vimal Kumar
Summary: The study highlights the importance of 3R approach, competitive advantage of CE, consumer attraction to recycling, sustainability goals achievement, and resource conservation through material reuse as key prospects for transitioning from LE to CE. However, impediments such as awareness issues, recyclability challenges, financial constraints, weak management vision, and lack of trained employees were identified. Additionally, consumer acceptability and prerequisites like strong management will, innovation, technology up-gradation, employee training, motivation, and guidelines were found to be crucial for successful CE implementation.
BUSINESS STRATEGY AND THE ENVIRONMENT
(2021)
Article
Chemistry, Analytical
Dan Dobrota, Sever-Gabriel Racz, Mihaela Oleksik, Ionela Rotaru, Madalin Tomescu, Carmen Mihaela Simion
Summary: The objective of this research was to design intelligent tools that can control tool vibrations and improve the roughness of processed surfaces. The study showed that the designed intelligent tools perform well in processing aluminum alloys and are not affected by cooling-lubrication fluids.
Article
Chemistry, Physical
Dan Dobrota, Mihaela Oleksik, Anca Lucia Chicea
Summary: Optimizing the machining process for aluminum bronze alloy can reduce energy consumption and improve surface roughness. The research showed that using a specific cutting tool variant can reduce power consumption by approximately 30% and decrease roughness of the processed surface by approximately 90-100%.
Article
Chemistry, Physical
Karmveer, Naveen Kumar Gupta, Md Irfanul Haque Siddiqui, Dan Dobrota, Tabish Alam, Masood Ashraf Ali, Jamel Orfi
Summary: Artificial roughness on the absorber of the solar air heater improves performance but requires higher pumping power. Thermo-hydraulic performance considers both pumping power and heat gain. The shape, size, and arrangement of artificial roughness are crucial for performance optimization.
Article
Business
Alina Daniela Voda, Gabriela Dobrota, Dan Dobrota, Danut Dumitru Dumitrascu
Summary: This paper examines the issue of fiscal sustainability in EU member states and identifies the necessary fiscal policy instruments. Using empirical analysis, it finds a direct relationship between economic growth and private investment.
JOURNAL OF BUSINESS ECONOMICS AND MANAGEMENT
(2022)
Article
Chemistry, Physical
Aditya Vatsa, Tabish Alam, Md Irfanul Haque Siddiqui, Masood Ashraf Ali, Dan Dobrota
Summary: Numerical study on microchannels with a two-sided wedge shape at the base was conducted, and it was found that the microchannel with a wedge angle of 15 degrees demonstrated better thermohydraulic performance.
Article
Green & Sustainable Science & Technology
Andreea Ocolisanu, Gabriela Dobrota, Dan Dobrota
Summary: The study empirically investigates the effects of public investment on sustainable economic growth in emerging EU and Central European countries. The findings show that in most of the countries included in the sample, the long-term impact of a public capital shock on GDP is estimated to be negative. The analysis confirms the results by applying the VAR model and impulse response functions to estimate the accumulated multiplier.
Article
Engineering, Chemical
Jatoth Heeraman, Ravinder Kumar, Prem Kumar Chaurasiya, Naveen Kumar Gupta, Dan Dobrota
Summary: The aim of this research is to study the heat transfer and friction factor in a double-pipe heat exchanger using twisted tape with dimples. The study investigated the effect of different dimple diameters and a uniform diameter-to-depth ratio on heat transmission and friction factor properties. The results showed that the addition of dimples on the twisted tape is an excellent and cost-effective approach to improve heat transfer in heat exchangers.
Article
Thermodynamics
Raghav Singupuram, Tabish Alam, Masood Ashraf Ali, Saboor Shaik, Naveen Kumar Gupta, Nevzat Akkurt, Mukesh Kumar, Sayed M. Eldin, Dan Dobrota
Summary: This paper presents a novel design of microchannel heat sinks (MHS) that can effectively cool electronic components and maintain its temperature in the safe range. Circular extruding ribs were added on the side wall of the passage to enhance heat transfer. The study found that the maximum Nusselt number was observed at sector angles of 80 degrees, with values ranging from 7.26 to 64.11. The thermohydraulic performance parameter (THPP) values were greater than one, indicating the proposed design is reasonable and effective for thermal management of MHS.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Mehmet Ali Kallioglu, Ahmet Yilmaz, Ashutosh Sharma, Ahmed Mohamed, Dan Dobrota, Tabish Alam, Rohit Khargotra, Tej Singh
Summary: The study investigates the impact of different insulation materials and fuel types on the cooling and heating performance of buildings in various climatic conditions in India. The study evaluates potential parameters for expanded polystyrene and extruded polystyrene insulation materials across different locations. The results show that optimal insulation thickness, annual savings, and payback period vary depending on the cooling and heating requirements.
Review
Multidisciplinary Sciences
Rohit Khargotra, Raj Kumar, Rahul Nadda, Sunil Dhingra, Tabish Alam, Dan Dobrota, Anca Lucia Chicea, Kovacs Andras, Tej Singh
Summary: Heat transfer in water using solar energy is an effective way to utilize renewable energy and reduce dependence on non-renewable sources. Utilizing turbulent promoters is an efficient solution to enhance heat exchanger performance. This review summarizes experimental and numerical studies on heat exchangers, including thermal examinations and fluid flow characteristics with different turbulent promoters and tube arrangements. It also compares the thermal performance of twisted tape configurations in heat exchanger tubes using correlations developed by different researchers.
Review
Polymer Science
Sergiu Lazar, Dan Dobrota, Radu-Eugen Breaz, Sever-Gabriel Racz
Summary: This research presents analyses on the eco-design of polymer matrix composite parts, addressing its definition, benefits, and importance in various stages of product development. It emphasizes the adoption of sustainable approaches in product design and manufacturing, with a focus on waste recycling technologies for these materials. The research promotes eco-design as an essential strategy for sustainable and responsible production, inspiring companies to adopt these principles for the benefit of the environment and their business performance.
Article
Thermodynamics
Anil Kumar, Masood Ashraf Ali, Rajesh Maithani, Naveen Kumar Gupta, Sachin Sharma, Sunil Kumar, Lohit Sharma, Robin Thakur, Tabish Alam, Dan Dobrota, Sayed M. Eldin
Summary: This research paper presents an experimental analysis on a heat exchanger tube using a newly designed perforated conical ring combined with twisted tape as inserts. The investigation analyzes various geometric and flow parameters and establishes empirical correlations for the Nusselt number and the friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Rajesh Maithani, Anil Kumar, Masood Ashraf Ali, Naveen Kumar Gupta, Sachin Sharma, Tabish Alam, Sayed M. Eldin, Javed Khan Bhutto, Dan Dobrota, Florin Cristian Ciofu
Summary: This numerical study explores a modified solar heat collector with wavy delta winglets as turbulent promoters. The winglets disrupt the viscous layer, improving heat transfer in the rectangular channel. The analysis considers parameters such as pitch, number of waves, and flow angle of attack. The study finds that a specific combination of parameters achieves a maximum exergy efficiency of 29.18%.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Shashank Pal, Anil Kumar, Masood Ashraf Ali, Naveen Kumar Gupta, Shyam Pandey, Praveen Kumar Ghodkhe, Swapnil Bhurat, Tabish Alam, Sayed M. Eldin, Dan Dobrota
Summary: Chemical recycling of MMPW is a feasible method to reduce plastic waste and recover energy products, especially liquid. Pyrolysis at 550 degrees C can produce high-grade plastic oil with a yield of 69.8 wt%. Engine tests showed that increasing the proportion of plastic oil in diesel fuel increased cylinder pressure and net heat release rate, but decreased brake thermal efficiency. Emissions such as CO, HC, and NOx were higher for plastic oil blends, while CO2 and smoke opacity were reduced compared to reference diesel.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Multidisciplinary Sciences
Fisal Asiri, Md Irfanul Haque Siddiqui, Masood Ashraf Ali, Tabish Alam, Dan Dobrota, Radu Chicea, Robert Daniel Dobrota
Summary: A mathematical model has been developed to study myocyte contraction in the human cardiac muscle. The interactions of various parameters in the heart muscle have been explored numerically, and the Land model provides a good platform for analyzing the active contraction of human cardiac myocytes.
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)
