cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.29437393.v1
title: Numerical investigation on the lean-burn methanol in the main chamber with different active pre-chamber geometries and initial temperature

description: Methanol, a promising alternative fuel, has garnered extensive attention within the international internal combustion engine community. Nevertheless, its application in such engines faces challenges, including difficulties with cold starting under light load conditions, combustion instability, and elevated unconventional emissions. The pre-chamber jet ignition technology, which enhances ignition energy and accelerates flame propagation, emerges as an efficacious solution to these issues. Accordingly, the research presented in this paper focuses on analyzing the effects of the active pre-chamber’s structural design and initial temperature on ignition jet behavior. Furthermore, it explores the dilution limit of jet-ignited methanol. Findings reveal that the concentration stratification and flame propagation process are substantially affected by the length-to-diameter ratio of the pre-chamber, with those having a smaller aspect ratio exhibiting higher combustion efficiency, jet flow rate, and turbulence intensity. An increase in the initial temperature markedly enhances the jet’s flow velocity and reactivity intensity. The combustion speed and heat release rate are observed to rise with the augmentation of the main chamber mixture’s equivalence ratio. Specifically, a pre-chamber with an aspect ratio (L/D) of 1 achieved a 17% higher combustion efficiency compared to L/D = 3, while the jet velocity peaked at 510 m/s for L/D = 1, compared to 440 m/s for L/D = 2 and 470 m/s for L/D = 3. An increase in the initial temperature from 600 K to 800 K markedly increased the OH radical mass fraction by 35%. The combustion speed and heat release rate were observed to rise with the augmentation of the main chamber mixture’s equivalence ratio. However, when the equivalence ratio falls below 0.3, the ignition delay period of the main chamber lengthens, giving rise to issues such as misfires and diminished combustion stability.
DOI: 10.6084/m9.figshare.29648337
title: Tapping the Potential of Dendrobiomass for Sustainable Energy Source in India – A Systematic Review

description: Dendrobiomass has gained significant global attention as a renewable energy source. However, its sustainability remains a topic of debate, as its carbon neutrality depends on various factors, including end-use, moisture content, bulk density, and transportation distance. The role of policy frameworks is critical in shaping its sustainability and potential for emission reductions. This study presents a systematic review of global literature from 1989 to 2024, examining dendrobiomass production, land availability, associated challenges, constraints, and the role of dendrobiomass in energy systems. Research highlights its potential as a decentralized energy source, particularly for rural and off-grid communities, with a focus on harvesting, transportation, and localized energy conversion. Despite its promise, policies primarily address land management and energy infrastructure rather than directly targeting emission reductions and conversion technologies. Focusing on the Indian context, the study highlights the nation’s vast dendrobiomass potential. India has approximately 80.9 million hectares of forest land. These areas provide 590 million tons of sustainable biomass, with forest residues and wood industry waste generating 236 million gigajoules of energy. Efficient use of 203.8 million tons of waste could yield 3057 gigajoules, according to calculations made based on previous research. Key factors include sustainability criteria, financial incentives, and technology. Future research should enhance conversion efficiency, reduce emissions, and optimize the dendro-wood value chain. The study also emphasizes that future research should focus on enhancing small-scale conversion efficiencies, reducing emissions in international biomass trade, and optimizing the profitability of bioenergy products through the dendro-wood value chain system.
DOI: 10.6084/m9.figshare.29648337.v1
title: Tapping the Potential of Dendrobiomass for Sustainable Energy Source in India – A Systematic Review

description: Dendrobiomass has gained significant global attention as a renewable energy source. However, its sustainability remains a topic of debate, as its carbon neutrality depends on various factors, including end-use, moisture content, bulk density, and transportation distance. The role of policy frameworks is critical in shaping its sustainability and potential for emission reductions. This study presents a systematic review of global literature from 1989 to 2024, examining dendrobiomass production, land availability, associated challenges, constraints, and the role of dendrobiomass in energy systems. Research highlights its potential as a decentralized energy source, particularly for rural and off-grid communities, with a focus on harvesting, transportation, and localized energy conversion. Despite its promise, policies primarily address land management and energy infrastructure rather than directly targeting emission reductions and conversion technologies. Focusing on the Indian context, the study highlights the nation’s vast dendrobiomass potential. India has approximately 80.9 million hectares of forest land. These areas provide 590 million tons of sustainable biomass, with forest residues and wood industry waste generating 236 million gigajoules of energy. Efficient use of 203.8 million tons of waste could yield 3057 gigajoules, according to calculations made based on previous research. Key factors include sustainability criteria, financial incentives, and technology. Future research should enhance conversion efficiency, reduce emissions, and optimize the dendro-wood value chain. The study also emphasizes that future research should focus on enhancing small-scale conversion efficiencies, reducing emissions in international biomass trade, and optimizing the profitability of bioenergy products through the dendro-wood value chain system.
DOI: 10.15468/dl.spj5ae
title: Occurrence Download

description: A dataset containing 339 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Aporosa yunnanensis)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 339 records from 12 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0053791-251120083545085/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.6084/m9.figshare.30880172
title: The source data files for "<b>Glass formation in hybrid metal halides via breaking molecular rotational order"</b>

description: The source data files for the manuscript "<b>Glass formation in hybrid metal halides via breaking molecular rotational order"</b>.
DOI: 10.6084/m9.figshare.30880172.v1
title: The source data files for "<b>Glass formation in hybrid metal halides via breaking molecular rotational order"</b>

description: The source data files for the manuscript "<b>Glass formation in hybrid metal halides via breaking molecular rotational order"</b>.
DOI: 10.6084/m9.figshare.30524203
title: Numerical simulation study on wake characteristics of dual wind turbines coupled with Variable-Slope Hills

description: In the micro-siting of complex wind farms, one of the primary challenges in wind turbine arrangement is the overall power loss caused by terrain effects and wake interference between turbines. This study focuses on dual wind turbines arranged in a longitudinal tandem configuration under varying hill aspect ratios. A RANS is employed to model the flow characteristics within the wake region generated by the power output and aerodynamic behavior of the turbines across multiple terrain configurations. The underlying flow mechanisms within the wake region under different hill aspect ratios are systematically investigated. The results indicate that in hilly terrain with a Hill aspect ratio ranging from 0.14 to 0.25, when wind turbines are arranged with vertical elevation differences, the influence of the terrain on the flow field at the base of the windward slope is relatively minor. However, for turbines located near the hilltop, the inflow wind speed increases by 10%–30% compared to those situated at the leeward base, while turbulence intensity decreases by approximately 2%–6%, leading to a 1 to 2fold increase in power output. As the terrain aspect ratio increases, the recovery of wake interference within the coupled terrain – turbine wake system is enhanced, regardless of elevation differences. Specifically, the wake recovery distance shortens from 15D to 13D. In conjunction with spectral analysis of turbine power output, these findings suggest that wind farm micro-siting should prioritize low-aspect-ratio hilly terrains and adopt elevated arrangements (with height differences) to maximize wind energy utilization efficiency.
DOI: 10.6084/m9.figshare.30524203.v1
title: Numerical simulation study on wake characteristics of dual wind turbines coupled with Variable-Slope Hills

description: In the micro-siting of complex wind farms, one of the primary challenges in wind turbine arrangement is the overall power loss caused by terrain effects and wake interference between turbines. This study focuses on dual wind turbines arranged in a longitudinal tandem configuration under varying hill aspect ratios. A RANS is employed to model the flow characteristics within the wake region generated by the power output and aerodynamic behavior of the turbines across multiple terrain configurations. The underlying flow mechanisms within the wake region under different hill aspect ratios are systematically investigated. The results indicate that in hilly terrain with a Hill aspect ratio ranging from 0.14 to 0.25, when wind turbines are arranged with vertical elevation differences, the influence of the terrain on the flow field at the base of the windward slope is relatively minor. However, for turbines located near the hilltop, the inflow wind speed increases by 10%–30% compared to those situated at the leeward base, while turbulence intensity decreases by approximately 2%–6%, leading to a 1 to 2fold increase in power output. As the terrain aspect ratio increases, the recovery of wake interference within the coupled terrain – turbine wake system is enhanced, regardless of elevation differences. Specifically, the wake recovery distance shortens from 15D to 13D. In conjunction with spectral analysis of turbine power output, these findings suggest that wind farm micro-siting should prioritize low-aspect-ratio hilly terrains and adopt elevated arrangements (with height differences) to maximize wind energy utilization efficiency.
DOI: 10.6084/m9.figshare.17311485
title: Productivity enhancement of stepped solar still by loading with magnets and suspended micro charcoal powder

description: Solar desalination technology is an eco-friendly and sustainable pathway to generate pure water. In the current investigation, the stepped solar still were loaded with 10 magnet rings and charcoal powder of 75 microns to make the still efficient. Three different types of solar stills namely, conventional stepped solar still (CSSS), magnetic stepped solar still (MSSS), and magnet charcoal stepped solar still (MCSSS) were tested simultaneously at 1 cm, 2 cm, and 3 cm depths of water. The deployment of magnets in MSSS and magnets and charcoal in MCSSS were found to significantly enhance the radiative, convective, and evaporative rates of heat transfer. The highest total heat transfer rate was found in MCSSS which was more than the rates in MSSS and CSSS by 30.94% and 91.70%, respectively. The cumulative yield outputs in MCSSS were 104.54% and 23.28%, respectively, higher than CSSS and MSSS. The exergetic efficiency in MCSSS was higher by 31.84% and 145.82%, respectively, in comparison to the MSSS and CSSS. In addition, an economic evaluation was carried out and the annual distillation cost and overall cost of one liter of water per 0.25 m<sup>2</sup> were found to be 48.6 and 0.029 USD, respectively. The results emphatically indicate that the proposed solar still is a simple and economical technique to improve the distillate output in an eco-friendly manner.
DOI: 10.6084/m9.figshare.17311485.v1
title: Productivity enhancement of stepped solar still by loading with magnets and suspended micro charcoal powder

description: Solar desalination technology is an eco-friendly and sustainable pathway to generate pure water. In the current investigation, the stepped solar still were loaded with 10 magnet rings and charcoal powder of 75 microns to make the still efficient. Three different types of solar stills namely, conventional stepped solar still (CSSS), magnetic stepped solar still (MSSS), and magnet charcoal stepped solar still (MCSSS) were tested simultaneously at 1 cm, 2 cm, and 3 cm depths of water. The deployment of magnets in MSSS and magnets and charcoal in MCSSS were found to significantly enhance the radiative, convective, and evaporative rates of heat transfer. The highest total heat transfer rate was found in MCSSS which was more than the rates in MSSS and CSSS by 30.94% and 91.70%, respectively. The cumulative yield outputs in MCSSS were 104.54% and 23.28%, respectively, higher than CSSS and MSSS. The exergetic efficiency in MCSSS was higher by 31.84% and 145.82%, respectively, in comparison to the MSSS and CSSS. In addition, an economic evaluation was carried out and the annual distillation cost and overall cost of one liter of water per 0.25 m<sup>2</sup> were found to be 48.6 and 0.029 USD, respectively. The results emphatically indicate that the proposed solar still is a simple and economical technique to improve the distillate output in an eco-friendly manner.
DOI: 10.6084/m9.figshare.30696306
title: Impact of supercritical pressure on flow heat transfer characteristics and thermal cracking conversion characteristics of n-undecane

description: This systematic study investigates the flow, heat transfer, and thermal cracking behavior of n-undecane fuel under supercritical pressures, emphasizing the impact of pressure on the dynamics of fuel heat transfer and the kinetics of thermal cracking. Integrating insights from supercritical fluid research – such as the role of local specific heat capacity in heat transfer and pressure effects on microchannel flow – experiments quantify heat absorption, cracking conversion, and product distribution at 2.5–4.5 MPa. Results show that pressure negligibly affects physical heat absorption but modulates chemical heat absorption via pressure-dependent reaction pathways. At fixed conditions (outlet temperature: 650°C; flow rate: 40 mL/min), increasing pressure from 2.5 to 4.5 MPa enhances cracking conversion by 2.55% and gas production by 2.33%. Elevated pressure (3.5→4.5 MPa) promotes the formation of higher-molecular-weight liquid fractions and alkane-dominated gases, suppresses cracking acceleration, and enhances radical reactions (e.g. hydrogen transfer, cyclization). At 620°C, increasing the pressure to 4.5 MPa enhances the heat release of gaseous products, which is attributed to higher gas yields. These findings establish pressure as a critical parameter for optimizing the thermochemical balance between heat transfer and cracking in hydrocarbon fuel systems.
DOI: 10.6084/m9.figshare.30696306.v1
title: Impact of supercritical pressure on flow heat transfer characteristics and thermal cracking conversion characteristics of n-undecane

description: This systematic study investigates the flow, heat transfer, and thermal cracking behavior of n-undecane fuel under supercritical pressures, emphasizing the impact of pressure on the dynamics of fuel heat transfer and the kinetics of thermal cracking. Integrating insights from supercritical fluid research – such as the role of local specific heat capacity in heat transfer and pressure effects on microchannel flow – experiments quantify heat absorption, cracking conversion, and product distribution at 2.5–4.5 MPa. Results show that pressure negligibly affects physical heat absorption but modulates chemical heat absorption via pressure-dependent reaction pathways. At fixed conditions (outlet temperature: 650°C; flow rate: 40 mL/min), increasing pressure from 2.5 to 4.5 MPa enhances cracking conversion by 2.55% and gas production by 2.33%. Elevated pressure (3.5→4.5 MPa) promotes the formation of higher-molecular-weight liquid fractions and alkane-dominated gases, suppresses cracking acceleration, and enhances radical reactions (e.g. hydrogen transfer, cyclization). At 620°C, increasing the pressure to 4.5 MPa enhances the heat release of gaseous products, which is attributed to higher gas yields. These findings establish pressure as a critical parameter for optimizing the thermochemical balance between heat transfer and cracking in hydrocarbon fuel systems.
DOI: 10.6084/m9.figshare.29566917
title: Volatilization properties and environmental impact of chromium and lead during low-rank coal pyrolysis

description: Study utilized sequential chemical extraction to analyze the distribution and occurrence forms of Chromium (Cr) and Lead (Pb) in two low-rank coals, and obtain the rich-component (RC) samples. The volatilization characteristics of Cr and Pb during coal pyrolysis were investigated through both raw coal and RC samples in a fixed-bed reactor at 400 ~ 800°C. It was revealed that the occurrence mode of Cr was predominantly associated with aluminosilicate, organic matter, and carbonates, whereas Pb was mainly found in carbonates. The volatility characteristics of Cr and Pb in coal depend on individual thermochemical characteristics and occurrence modes. The volatilization temperature range for both the disulfide and organic mode of Cr and Pb was between 400°C and 600°C, but that of the aluminosilicate exceeded 700°C. Environmental evaluation demonstrated that pyrolysis reduced the potential environmental impact of trace elements (TEs) in raw coal while enhancing the stability of TEs in the resulting char. At 800°C, the total potential ecological impact factor (RI) of TEs in Xinjiang coal decreased from 998.75 to 1.08. While for Yunnan coal, RI decreased from 497.98 to 0.62.
DOI: 10.6084/m9.figshare.29566917.v1
title: Volatilization properties and environmental impact of chromium and lead during low-rank coal pyrolysis

description: Study utilized sequential chemical extraction to analyze the distribution and occurrence forms of Chromium (Cr) and Lead (Pb) in two low-rank coals, and obtain the rich-component (RC) samples. The volatilization characteristics of Cr and Pb during coal pyrolysis were investigated through both raw coal and RC samples in a fixed-bed reactor at 400 ~ 800°C. It was revealed that the occurrence mode of Cr was predominantly associated with aluminosilicate, organic matter, and carbonates, whereas Pb was mainly found in carbonates. The volatility characteristics of Cr and Pb in coal depend on individual thermochemical characteristics and occurrence modes. The volatilization temperature range for both the disulfide and organic mode of Cr and Pb was between 400°C and 600°C, but that of the aluminosilicate exceeded 700°C. Environmental evaluation demonstrated that pyrolysis reduced the potential environmental impact of trace elements (TEs) in raw coal while enhancing the stability of TEs in the resulting char. At 800°C, the total potential ecological impact factor (RI) of TEs in Xinjiang coal decreased from 998.75 to 1.08. While for Yunnan coal, RI decreased from 497.98 to 0.62.
DOI: 10.6084/m9.figshare.30510795
title: Thermodynamic analysis and reaction kinetics of a flue gas recirculation-enhanced pyrolysis-gasification cycle for low-heating-value syngas combustion

description: A novel low-heating-value syngas combustion-biomass pyrolysis and gasification cycle system is introduced in this study, marking a significant advancement in renewable energy conversion. Unlike conventional approaches, the integrated system utilizes Phragmites communis, an aquatic plant as feedstock, and employs a unique coupling of Aspen Plus thermodynamic modeling with reaction kinetics. This integration enables a comprehensive simulation of the entire process, from pyrolysis and gasification to syngas combustion. By optimizing flue gas recirculation, the system’s closed-loop design significantly boosts energy efficiency and substantially reduces pollutant emissions.At a flue gas reflux ratio of 0.2, the system achieves a remarkable thermal efficiency of 69.22%, while maintaining stable combustion even at practical operating conditions with a slightly lower reflux ratio of 0.3, yielding a thermal efficiency of 61.27% and minimal CO and NO<sub>X</sub> emissions. This research stands out by addressing the limitations of traditional biomass gasification, such as tar formation and low heating value gas combustion instability, through the synergistic integration of flue gas waste heat recovery and internal gasification agents. The proposed system offers a green and low-carbon solution for biomass conversion, providing a robust framework for optimizing energy structures and reducing greenhouse gas emissions.
DOI: 10.6084/m9.figshare.30510795.v1
title: Thermodynamic analysis and reaction kinetics of a flue gas recirculation-enhanced pyrolysis-gasification cycle for low-heating-value syngas combustion

description: A novel low-heating-value syngas combustion-biomass pyrolysis and gasification cycle system is introduced in this study, marking a significant advancement in renewable energy conversion. Unlike conventional approaches, the integrated system utilizes Phragmites communis, an aquatic plant as feedstock, and employs a unique coupling of Aspen Plus thermodynamic modeling with reaction kinetics. This integration enables a comprehensive simulation of the entire process, from pyrolysis and gasification to syngas combustion. By optimizing flue gas recirculation, the system’s closed-loop design significantly boosts energy efficiency and substantially reduces pollutant emissions.At a flue gas reflux ratio of 0.2, the system achieves a remarkable thermal efficiency of 69.22%, while maintaining stable combustion even at practical operating conditions with a slightly lower reflux ratio of 0.3, yielding a thermal efficiency of 61.27% and minimal CO and NO<sub>X</sub> emissions. This research stands out by addressing the limitations of traditional biomass gasification, such as tar formation and low heating value gas combustion instability, through the synergistic integration of flue gas waste heat recovery and internal gasification agents. The proposed system offers a green and low-carbon solution for biomass conversion, providing a robust framework for optimizing energy structures and reducing greenhouse gas emissions.