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Attaining Sustainable Development Goals (SDGs) is important to control the adverse impacts of climate change and achieve sustainable development. Among the 17 SDGs, target 13 emphasizes enhancing urgent actions to combat climate-related changes. This target is also dependent on target 7, which advocates enhancing access to cheap alternative sustainable energy. To accomplish these targets, it is vital to curb the transport CO 2 emissions (TCO 2 ) which increased by approximately 80% from 1990 to 2019. Thus, this study assesses the role of transport renewable energy consumption (TRN) in TCO 2 by taking into consideration transport fossil fuel consumption (TTF) and road infrastructure (RF) from 1970 to 2019 for the United States (US) with the intention to suggest some suitable mitigation policies. Also, this study assessed the presence of transport environmental Kuznets curve (EKC) to assess the direction of transport-induced growth. The study used the Bayer-Hanck cointegration test which utilizes four different cointegration techniques to decide cointegration along with the Gradual Shift causality test which considers structural shift and fractional integration in time series data. The long-run findings of the Dynamic Ordinary Least Squares (DOLS) test, which counters endogeneity and serial correlation, revealed that the transport renewable energy use mitigates as well as Granger causes TCO 2 . However, transport fossil fuel usage and road infrastructure enhance TCO 2 . Surprisingly, the transport EKC is invalid in the case of the US, and increased growth levels are harmful to the environment. The association between TCO 2 and economic growth is similar to a U-shaped curve. The Spectral Causality test revealed the growth hypothesis regarding transport fossil fuel use and economic growth connection, which suggests that policymakers should be cautious while decreasing the usage of transport fossil fuels because it may hamper economic progress. These findings call for revisiting growth strategies and increasing green energy utilization in the transport sector to mitigate transport emissions.

Follows the world's dependence on fossil fuels and shows how people are working to reduce their use and even make them more environmentally friendly.

In order to enhance sustainability in maritime shipping, shipping companies spend good efforts in improving the operational energy efficiency of existing ships. Accurate fuel consumption prediction model is a prerequisite of such operational improvements. Existing grey-box models (GBMs) are found with significant performance potential for ship fuel consumption prediction, although having a limitation of separating weather directions. Aiming to overcome this limitation, we propose a novel genetic algorithm-based GBM (GA-based GBM), where ship fuel consumption is modelled in a procedure based on basic principles of ship propulsion and the unknown parameters in this model are estimated with a GA-based procedure. Real ship operation data from a crude oil tanker over a 7-year sailing period are used to demonstrate the accuracy and reliability of the proposed model. To highlight the contribution of this work, we compare the proposed model against the latest GBM. The results show that the fitting performance of the proposed model is remarkably better, especially for oblique weather directions. The proposed model can be employed as a basis of ship energy efficiency management programs to reduce fuel consumption and greenhouse gas (GHG) emissions of a ship. This is beneficial to achieve the goal of sustainable shipping.

PurposeIn this paper, the authors investigate that the increasing level of fossil fuel combustion in the industrial sector has been considered the prime cause for the emissions of greenhouse gas. Meanwhile, the research focusing on the impact of fossil fuel consumption on the emission of CO2 is limited for the developing countries containing Vietnam. This study applied the autoregressive distributed lag (ARDL) approach with structural breaks presence, and the Bayer–Hanck combined cointegration method to observe the rationality of the environmental Kuznets curve (EKC) hypothesis in the dynamic relationship between the industrialization and carbon dioxide (CO2) emission in Vietnam, capturing the role of foreign direct investment (FDI) inflows and the fossil fuel consumption over the period of 1975–2019. The outcomes revealed the confirmation of cointegration among the variables and both short and long-run regression parameters indicated the evidence for the presence of a U-shaped association between the level of industrial growth and CO2 emission that is further confirmed by employing the Lind and Mehlum U-test for robustness purpose. The results of Granger causality discovered a unidirectional causality from FDI and fossil fuel consumption to CO2 emission in the short run. For the policy points, this study suggests the use of efficient and low carbon-emitting technologies.Design/methodology/approachIn order to test for consistency and robustness of the cointegration analysis, this study also applied the ARDL bound testing method to find out long-run association among variables with the existence of the structural break in the dataset. The ARDL method was preferred to other traditional cointegration models; because of the smaller dataset, the results obtained from the ARDL method are efficient and consistent and equally appropriate for I(1) and I(0) variables.FindingsThe short-run and long-run causal associations among variables have been observed by employing the error correction term (ECT) augmented Granger-causality test that revealed the presence of the long-run causality among variables only when the CO2 emission is employed as a dependent variable. The outcomes for short-run causality indicated the presence of unidirectional causality between consumption of fossil fuel and CO2 emission, where the fossil fuel consumptions Granger-cause CO2 emission. Industrial growth has also been found to have an impact on fossil fuel consumptions, however not the opposite. This advocates that the policies aimed at reducing the fossil fuel consumptions would not be harmful to industrial growth as other energy efficient and cleaner technology could be implemented by the firms to substitute the fossil fuel usage.Originality/valueThe study explored the dynamic relationship among FDI, consumption of fossil fuel, industrial growth and the CO2 emission in Vietnam for the time period 1975–2019. The newly established Bayer–Hanck joint cointegration method and the ARDL bound testing were employed by taking into account the structural breaks in the dataset.

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In order to solve the problem of high fuel consumption and poor emission performance in high horsepower tractors, a parallel hybrid tractor system was designed using a dual power source of an engine and motor matched with a hydro-mechanical continuously variable transmission (HMCVT). An equivalent fuel consumption minimization strategy (ECMS) was used for power distribution of this hybrid system. To address the problem of poor adaptability of the equivalence factor to different working cycles in the conventional ECMS, a fuzzy adaptive equivalent fuel consumption minimization strategy (FA-ECMS) was proposed. A fuzzy PI controller based on battery SOC (State of Charge) feedback was designed to adjust the equivalence factor in real time, so as to achieve adaptive control of the equivalence factor. The physical model of the system was built by SimulationX, and the model of the control strategy was built using Matlab/Simulink. Two typical cycles of tractor plowing and road transportation were simulated. Under ECMS, the fuel consumption of the hybrid agricultural tractor was 14.3 L and 1.19 L in one plowing cycle and one transport cycle, respectively, with final battery SOC values of 60.75% and 60.32%, respectively. Under FA-ECMS, the hybrid farm tractor consumed 13.34 L and 1.13 L in one plowing cycle and one transport cycle, respectively, with final battery SOC values of 60.27% and 60.17%, respectively. The results showed that, with the introduction of a fuzzy PI controller to dynamically adjust the equivalence factor, the overall fuel consumption was reduced by 6.71% and 5.04%, respectively, and the battery power maintenance performance was improved. The designed control strategy could achieve a more reasonable power distribution between the engine and motor while maintaining the balance of the battery SOC.

This study investigates the comparative performance and emission characteristics of four fuels: diesel, liquefied petroleum gas (LPG), neat biodiesel (mustard-based) and gasoline, using a single-cylinder, four-stroke engine operated at a constant speed of 1500 rpm under eight load conditions (0.25 kW to 2.00 kW). Experiments were conducted both on the stock diesel engine and on the same engine modified for spark ignition (SI) operation. Key performance indicators such as thermal efficiency (TE), fuel consumption and emissions (hydrocarbons, carbon monoxide and nitrogen oxides (NOx)) were measured under steady-state conditions. Outcome indicated that LPG produced the lowest hydrocarbon and carbon monoxide emissions, highlighting its potential as a clean-burning fuel. Biodiesel exhibited moderate emissions but recorded the highest NOx levels, likely due to its higher oxygen content. Diesel demonstrated the best fuel economy (lowest specific fuel consumption (SFC)) but higher emissions compared to LPG and biodiesel. Gasoline achieved the highest TE but exhibited the highest hydrocarbon and carbon monoxide emissions, making it the least environmentally favourable option. The findings support the viability of LPG and biodiesel as cleaner alternatives to conventional diesel and gasoline, with trade-offs in fuel economy and NOx requiring further optimisation.

In this study, the effects of silicon dioxide (SiO2) nanoparticles dispersed in an Abrus precatorius biodiesel blend (BD20) on diesel engine operating characteristics were investigated, and response surface methodology (RSM) was used to predict engine characteristics. Nanofuels were prepared at different concentrations of 50, 75, and 100 ppm, respectively, using the A. precatorius biodiesel blend and further dispersed with a QPAN 80 dispersant (at a 1:1 ratio). A stability analysis was performed before the experiment. Finally, the test was conducted on a compression ignition engine by changing the injection pressure (IP) from 180 to 240 bar. The performance characteristics considered included cylinder pressure (CP), net heat release rate (NHRR), brake thermal efficiency (BTE), brake-specific fuel consumption (BSFC), carbon monoxide (CO), unburned hydrocarbon (UHC), and nitrogen oxides (NOx). Engine load, fuel samples, and injection pressure were used as input parameters. The results revealed that BD20 + 75SiO2 + 75DSP yielded optimal results compared with normal diesel fuel, with the CP, NHRR, BTE, BSFC, CO, UHC, and NOx values of 59.52 bar, 85.16 J/degree, 34.42%, 0.297 kg/kWh, 0.021%, 35 ppm, and 873 ppm, respectively, at an IP of 240 bar. Finally, RSM predictions yielded a correlation coefficient (R2) for each parameter that ranged from 0.92 to 0.98.