Biofuels-UK

Papers
(The median citation count of Biofuels-UK is 3. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-08-01 to 2026-08-01.)
ArticleCitations
Monitoring of biodiesel oxidation reaction in the absence and presence of coffee leaves extract as an antioxidant additive57
An investigation of the longevity wear assessment during the utilisation of biofuel-diesel blends in a diesel engine: a case study of crude palm and crude jatropha oil46
Cell disruption of Chlorella sp. and Ecklonia maxima biomass for bioethanol production using Saccharomyces cerevisiae41
Transmission of variations in the biodiesel mandate for Brazilian biodiesel market39
Hybrid pathway of bio-ethanol production employing empty fruit bunches co-gasified with charcoal and mixed culture fermentation: Optimization using response surface methodology37
Functionalized iron oxide nanoparticles for covalent immobilization of cellic CTec2 cellulase: enabling enzyme reusability in cellulosic biomass conversion34
High yield production of lipid and carotenoids in a newly isolated Rhodotorula mucilaginosa by adapting process optimization approach32
Biodiesel production from by extraction of carp fish (Cyprinidae) oil and transesterification using CaO derived from limestone and eggshells as heterogeneous catalysts32
Recycling calcium oxide nanoparticles for sustainable biodiesel production from nonedible feedstock Argemone mexicana L.32
Gasifier use for cooking and biochar production by smallholder farmers in Rwanda31
Optimizing biodiesel production from Capparis spinosa oil using supercritical methanol31
A bibliometric analysis of studies on diesel engines fuelled with biodiesel and its blends: trends, hotspots, and future research29
Introducing a promising biomass for bioethanol production: sugary cassava root ( Manihot esculenta Crantz)28
Recent advances in conventional and genetically modified macroalgal biomass as substrates in bioethanol production: a review27
Exploring the impact of diesel-vegetable oil blends as an alternative fuel in combustion chambers26
Comparative assessment of pre-treatment techniques and process economics on marine seaweed, Gelidium pusillum, for enhanced bioethanol production25
From fossil fuels to renewables: an analysis of fuel transition in Swedish heavy transport and industry24
Performance analysis, techno-economic and life cycle assessment of Jatropha curcas L. (Euphorbiaceae) seedcake gasification and Fischer-Tropsch integrated process for bi24
Embrittlement pretreatment of fibrous biomass for improving its grindability and combustibility in coal firing power generation24
Comprehensive analysis of formaldehyde and acetaldehyde emissions and performance of a diesel engine using various diesel-vegetable oil and diesel-biodiesel blends22
Advancements in direct bio-photolysis: optimizing photosynthetic hydrogen production through environmental and genetic innovations22
CFD simulation of methanol and soybean oil mixing in SMX static mixers: the effect of length-to-diameter ratio20
Controlling oxygen in biomass-to-energy chemistry: catalytic pathways from lignocellulosic oxygenates to renewable fuels and energy carriers20
Prospects and limitations of existing biofuels and emerging trends in the utilization of nanoparticles for enhanced biofuel production and microbial fuel cell efficiency20
Integrated kinetic and reactor-scale evaluation of pinewood gasification in a downdraft reactor: mechanistic insights and performance assessment19
Pyrolysis of rice-straw and mustard-oil residue blend: evaluation of biochar properties for its sustainable use19
Chemical composition retention perspective: research on pretreatment production of lignocellulose bioethanol19
High potential low-cost crude enzymes from Algerian fungal strains for plant polysaccharides hydrolysis19
Influence of municipal food waste and poultry manure mixing on substrate physicochemical properties and biogas production19
Extraction and characterisation of lignin from residues of Mexican Ocote pine ( Pinus montezumae Lamb.) for biofuel production18
Mapping the landscape of reduced kinetic mechanisms for ethanol diffusion flames: a scoping review18
Analysis of selective extraction of biofuel components from aqueous solution using single-stage membrane solvent extraction (MSE)18
Saccharification of lignocellulosic biomass using an enzymatic cocktail from marine bacteria17
Development of an efficient method to blend forest biomass with agricultural residue to produce fuel pellets with improved mechanical properties16
Long-term productivity of production-scale, high-diversity prairie biomass feedstocks16
Comprehensive processing of solid household waste using pyrolysis16
Evaluation of the structural and crystalline properties of hybrid biochar derived from co-carbonized polyethylene and soybean pod waste16
Modeling and analysis of hydrogen production bioprocess: Fe 2+ addition effect15
Advanced reactor design for biodiesel synthesis: evaluating a smooth periodic constriction reactor with sunflower oil and eggshell-derived CaO15
Investigation on chlorella Sp. HS2 microalgae growth using CO 2 from engine exhaust to study carbon sequestration15
Harnessing optimal light conditions for sustainable microalgal cultivation and biomass enhancement15
Towards sustainable continuous co-production of biodiesel and ether from wet microalgae- a review15
Performance assessment of compression ignition engines powered by biogas, biodiesel, and producer gas mix derived from agriculture waste15
Application of phosphoric acid plus hydrogen peroxide pretreatment and Aspergillus species enzymatic decomposition on rice straw for bioethanol production14
Influence of varying aluminum-based combustion compartment sizes on groundnut shell biochar properties14
Effect of single and combined pretreatment strategies applied to Chlorella vulgaris biomass on bioethanol production14
Microwave furfural aldol condensation with acetone to biofuel intermediates over a potassium promoted waste red mud-derived catalyst14
Effects of divalent cations and electron mediators on acetone–butanol–ethanol (ABE) fermentation of Ficus carica14
Potential use of thermophilic bacteria for second-generation bioethanol production using lignocellulosic feedstocks: a review14
Enhanced properties of bio-pellet fuel from sawdust via low-temperature wet torrefaction with varying acetic acid concentrations13
Photocatalytic degradation on Sulphur–Nitrogen Co-Doped Fe 2 O 3 surface and enhanced nanostructure design using RERNN-FFO approac13
Production of biodiesel from Pistacia atlantica (PA) oil seeds using nano-catalyst of alumina/sludge of stone cutting factory (Al 2 O 13
A critical review on emulsion fuel formulation and its applicability in compression ignition engine12
Calorific value prediction models of processed refuse derived fuel 3 using ultimate analysis12
Study of the addition of Gabiroba leaves extract in the biodiesel oxidation reaction in the presence of metal ions12
Highlighting the relationship between bioethanol fuel and the institutional and macro-environmental environment in developed and developing countries12
Production and quality assessment of biodiesel obtained by thermal process from wet microalgae biomass of Choricystis minor var. minor11
Co-digestion strategies of rice straw and molasses for biohythane production: a techno-economic evaluation11
Overview of microwave-assisted transesterification technology for biodiesel production with bibliometric indicators11
Nanotechnology for a greener future: sustainable energy and biofuel advances11
Valorization of fish waste for sustainable biofuel production: A case study in Ghana11
Nanoparticles-suspended biodiesel and its blends in compression ignition engines: a bibliometric analysis of research trend and future outlook11
Effects of stably dispersed carbon nanotube additives in yellow oleander methyl ester-diesel blend on the performance, combustion, and emission characteristics of a CI engine11
Enhanced biogas generation from water hyacinth juice using an upflow anaerobic digester with effluent recirculation11
Carbon footprint of four bioethanol cropping systems in a temperate region11
Valorization of spent coffee grounds: a multi-solvent extraction approach and blending with waste cooking oil for sustainable biodiesel production11
Nitrogen-rich, potato peel-derived hydrochar as an effective dye adsorbent11
Tuning the acidity of pyridinium-based ionic liquid catalysts for enhanced biodiesel production using oleic acid: a DFT study11
Exergy analysis of fusel oil as an alternative fuel additive for spark ignition engines10
Sustainable biodiesel production from Raphanus sativus seed oil using phytosynthesized copper oxide nanocatalyst10
Synthesis and characterisation of a novel silica—CaO/TPA catalyst for biodiesel production10
A thermodynamic approach to assess the sustainability of third-generation sunflower waste cooking oil in DICI engine along with exergoeconomic and enviroeconomic perspective10
Parametric optimization by Box-Behnken design in the pyrolysis of spent coffee grounds and kinetic study10
A comprehensive assessment of vehicular performance and emission characteristics during real-time test-runs using selected bio-ethanol–gasoline blends10
Teak leaf biochar production for sustainable forest waste management at low temperatures10
Compositional study of bio-oil obtained from torrefaction of mixed food waste using H-NMR,13C-NMR, DEPT 90 & 135, and GC-MS10
State-of-the-art novel catalyst synthesized from waste rice husk and eggshells for cleaner biodiesel production10
Synergistic effects of SWCNT and MgO nanoparticle additives on engine performance and emissions: a laboratory analysis approach10
Anisidine value as oxidation stability indicator in FAME10
Modeling and simulation of an integrated bioethanol-hydrogen production process9
Simultaneous computational modelling and experimental validation for Sterculia urens oil extraction for biodiesel application9
Greenhouse gas emissions from rapeseed oil ethyl and methyl esters9
Effects of ethyl proxitol (1-ethoxy-2-propanol) additive on combustion and emission characteristics of biodiesel blends9
Biodiesel production from fish oil: a review9
Decomposition kinetics and diffusion-controlled mechanisms of organic industrial waste: a non-isothermal TGA–iso-conversional study9
Influence of inoculum-to-substrate ratio in the pilot-scale anaerobic co-digestion of organic fraction of municipal waste and sewage sludge9
NaCl stress mediated lipid and carotenoid production in freshwater microalga Kirchneriella obesa by optimization of medium composition using response surface methodology9
A combined study of filterability and soaking strength of fuel filter and effect of injection timing on CI engine characteristics using Ceiba pentandra biodiesel9
Growth characteristics and biodiesel properties of fatty acids methyl esters (FAMEs) of Scenedesmus dimorphus (Turpin) Kützing9
Exploring the potential of microalgae cell factories for generation of biofuels9
Effect of diesel and pentanol blends on PAH formation and regulated pollutants9
A methodology to formulate technology roadmap and policy package in biofuels8
The effects of the usage of silicon dioxide (SiO 2 ) and titanium dioxide (TiO 2 ) as nano-sized f8
Evaluation of combustion characteristics and emission reduction potential of fusel oil–gasoline blends in a turbocharged 1.8 L gasoline direct injection (GDI) engine8
Cellulolytic enzymes from Penicillium funiculosum MRJ-16 mutants and their application in the hydrolysis of pretreated rice straw8
Computational modeling of the combustion reaction kinetics of the oil palm’s Empty Fruit Bunch and Mesocarp Fiber8
Effect of hydrogen induction on CI engine characteristics fuelled with kapok oil methyl ester-turpentine blend with diethyl ether8
Thermo chemical conversion of cedar wood by pyrolysis technology for bio-oil8
The effects of biodiesel produced from waste cooking oils on vibroacoustic properties of a heavy-duty diesel engine8
Biodiesel synthesis using a physical mixture of calcium diglyceroxide and spent FCC catalysts – kinetics and catalyst reusability studies8
Enhanced biofuel dehydration using MXene-PES nanocomposite membranes via pervaporation8
Study of performance, emission characteristics, and parametric optimization of compression ignition engine using biofuels: A review8
Experimental investigation of elastomer compatibility and engine performance of biodiesel derived from deodorizer distillate8
Optimization studies on bio-oil yield using microwave-assisted pyrolysis of bio-sludge7
Comparative study of pretreatment methods for the reverse enzymatic hydrolysis of Chlorella and Spirulina microalgae for bioethanol produc7
Methanol, isobutanol, kerosene, dimethylfuran, ethanol, and isopropanol additives effects on soot concentration at hydrogen-enriched methane flames7
Experimental evaluation of cottonseed oil-camphor binary blends on diesel engine performance, combustion, exhaust and cyclic variance parameters7
Cultivation of Nannochloropsis oculata in palm oil mill effluent (POME) under different monochromatic light-emitting diode (LED) light wavelengths for biodiesel producti7
Urban wood waste blends with Eucalyptus sp. as a flexible alternative source to supply renewable energy systems7
A review on biomass pyrolysis and pyrolysis mechanisms7
Biodiesel production from sunflower oil using a combined atmospheric cold plasma jet-hydrodynamic reactor7
Analyzing the market conditions and long-term dynamics in the biodiesel industry7
Integrated assessment of waste-to-energy valorization in Sarawak: harnessing biofuel adoption for sustainability7
Enhancing sustainability: co-pyrolysis of date palm branches and wastewater microalgae for tailored biochar production7
Economic analysis of the sustainable aviation fuel supply chain from hybrid poplar in the southeast US considering alternative preprocessing technologies7
The feasibility of renewable energy recovery from municipal solid wastes in Palestine based on different scenarios7
Reductive deoxygenation of diphenolic acid using Ir, Re, Mn and Pd based catalysts for biofuel applications7
An in-depth comparative analysis of fuel evolution: tracking physico-chemical characteristics in conventional diesel, e-diesel, biodiesel, and aged biodiesel7
Combination of oscillatory and hydrodynamic system for biodiesel production from sunflower oil6
Influence of graphene oxide nanoparticles dispersed mahua oil biodiesel on diesel engine: performance, combustion, and emission study6
Techno economic approach of biogas in Konya Türkiye6
Combined effect of temperature, pH, salinity and trophic modes on lipid production of Nannochloropsis oculata6
Design and construction of a single orifice oscillatory flow reactor for the continuous production of biodiesel from sunflower oil6
Impact of color of light and nitrogen concentration on Pavlova sp. biomass, cells size and biochemical composition6
Antioxidative capacity evaluation of imine compounds as metal ions chelators and free radical scavengers in biodiesel6
Tapping the bioenergy potential of milled coffee wastes: a study on the pyrolysis kinetics, response surface methodology, and techno-economic feasibility6
Watermelon (Citrullus vulgaris) seed oil as a potential feedstock for biodiesel production in Nigeria6
Pyrolysis of coffee residues, tobacco, and algae biomasses as a source of nitrogen-containing compounds6
Biogas efficiency, yield and metal profiling of cattail ( Typha latifolia ) biomass in pilot-scale anaerobic digestion6
Sustainable fuel production: briquetting and characterization of torrefied pine needle biochar6
The comparative financial feasibility analysis and the environmental impacts of sugarcane-based bioethanol production in South Africa6
Application of principal component analysis (PCA) to the study of the influence of the thermochemical treatment process of tropical wood sawdust on the calorific, mechanical, physicochemical and combu6
Hydrothermal liquefaction of soy protein – differences between batch and continuous reactors6
The assessment of fusel oil in a compression-ignition engine in the perspective of the waste to energy concept: investigation of the performance, emissions, and combustion characteristics6
Experimental investigation of Chia ( Salvia Hispanica L ) seed oil as a novel promising feedstock for the CI engine5
Experimental investigation of benzyl alcohol premixing effect on 5E concepts of compression ignition engine powered with lemongrass oil – diesel blend using response surface methodology5
Comparison of microbial contaminants in conventional, synthetic and sustainable aviation fuels5
Enhancing bamboo juice fermentation for bioethanol production using mango-derived amylase5
Effect of synthetic antioxidant-doped biodiesel in the low heat rejection engine5
A critical review on sustainable biohydrogen production5
Suitable site analysis for microalgae biofuel production as a source of renewable energy5
Comparative study between compost and granular sludge inoculums as promising microbial consortia sources for biohydrogen production from food industry wastewater5
FeCl 3 -modified carbon as an electrode material for supercapacitors: preparation, analysis, and electrochemical properties5
Valorization of Nile perch wastes and cow rumen cud for biogas production through anaerobic co-digestion5
Biogas production from the organic fraction of municipal solid waste is enhanced by nickel addition in a two-stage system compared with a conventional digester5
Energy recovery from brewery spent grains and spent coffee grounds: a circular economy approach to waste valorization5
Optimization of design and development of a biomass gasifier – a review5
A review on the conversion of plant husk-based biomass into biochar5
Microalgae as a sustainable biofuel source: CO 2 fixation mechanism, lipid extraction, challenges, and future prospective. A review5
Integrating operating conditions to develop a neural network for predicting organics removal and power density in an earthen microbial fuel cell treating leachate5
The impacts of nano fuels containing Fe-Ni-TiO2/activated carbon nanoparticles on diesel engine performance and emission characteristics5
Resilience assessment model for biodiesel supply chain: an Indonesian case study5
Ethanol fuel in Brazil: policies and carbon emission avoidance5
Lipid extraction from Azolla filiculoides and its applications for catalyzed biodiesel production5
Price volatility spillovers between Canadian and US, agricultural and fuel markets4
Electrodes materials evaluation in plant microbial fuel cells: a comparison of graphite and stainless steels4
Co-combustion of multiple blends of coal, sewage sludge, and bamboo: thermal behaviors, kinetic evaluation, and heavy-metal migration4
Comparative evaluation of high solids anaerobic digestion of rice husk and rice straw: Impact of substrate characteristics and solids concentration on biogas yield and digestate quality4
Experimental and numerical investigation of hole-modified pine pellets during single-pellet combustion4
Evaluation of biogas production and pollutant removal efficiency of two-phase anaerobic digestion treating slaughterhouse effluent4
Policy risks in the biogas sector – the case of Sweden4
Assessing the potential of nutrient deficiency for enhancement of biodiesel production in algal resources4
A retrospect on recent research works in the preparation of zeolites catalyst from kaolin for biodiesel production4
Synergistic co-pyrolysis of corn stover and refuse-derived fuel with microplastics: Kinetic and thermodynamic study4
Urea addition during hydrolysis for increased ethanol yield from white sweet potato: a promising strategy4
Advancing the bioeconomy through biodiesel: a comparative evaluation of plant-based, animal-based, and mixed feedstocks for sustainable use of heating diesel4
Bacterial community issued from a Chlorophytum plant-microbial fuel cell for electricity generation4
Harnessing biodigestion for sustainable energy: agricultural residues utilization in Malambo, Colombia4
RSM modelling and yield prediction of base-catalyzed transesterification of pumpkin-seed oil to biodiesel: artificial neural network, kinetics, and thermodynamics4
Unlocking the future of sustainable energy: biodiesel synthesis from non-edible feedstocks powered by eco-friendly nano-magnetic catalysts4
Harnessing green synthesis for bioethanol production: insights from duckweed ( Lemna minor )4
Graphene oxide-catalyzed microwave-assisted esterification of oleic acid to biodiesel4
Production of bioethanol from Opuntia ficus-indica using Saccharomyces cerevisiae and Water Kefir following an autohydrolysis pretreatment4
Production and characterization of hierarchical zeolite Y catalyst for biodiesel production using waste cooking oil as a feedstock4
Biofuels as a Key Renewable Energy Source: a Review of Life Cycle Assessment Studies in South Africa4
Optimizing engine performance and emission properties with Garcinia indica biodiesel: a holistic RSM-TLBO-DFA strategy4
Proteobacterial dominance in endophytic bacterial diversity in switchgrass growing under nitrogen range and effect on plant growth4
Cork waste-based adsorbents for glycerol removal from biodiesel: a sustainable alternative to wet washing4
The influence of membrane separation technique in the biodiesel and bioethanol production process: a review4
Application of recycled nickel-oxide nanoparticles for biodiesel synthesis from the non-edible seed oil of Acacia farnesiana4
Optimization of Terminalia neotaliala (Madagascar almond) seed oil yield using central composite design and its fatty acid profiling4
Pre-treatment of waste cooking oil by combined activated carbon adsorption and acid esterification for biodiesel synthesis via two-stage transesterification4
Assessment of local biochar varieties as strategic modulators in enhancing biohydrogen yields via dark fermentation3
Modelling and simulation of fast pyrolysis of pomace from three-phase olive mill targeting optimal yields of pyrolysis products3
Evaluating the properties of a novel diesel-like fuel produced by biochar-assisted catalytic cracking of waste motor oil3
Optimization of pyrolysis process parameters for optimal high heating value of biochar produced from rice straw3
Bioethanol production from concentrated fruit wastes’ juice enhanced with fermentable sugar from millet ( Panicum miliaceum )3
Kinetic and thermodynamic approaches on biodiesel reaction in a simultaneously cooled enhanced microwave system3
Biodiesel production from non-edible oils using immobilized recombinant lipase from Pseudomonas fluorescens isolated in the Western Ghats, India3
Quantum neural network for performance and emission control in compression ignition engines using ternary fuel blends3
Lignocellulosic bioethanol production using Neurospora intermedia in consolidated bioprocessing (CBP) system3
Optimized bioethanol production from Lemna minuta biomass harvested from polluted water via acid and enzymatic hydrolysis3
Advances in the measurements of the biodiesel oxidative stability3
Characterization and bioethanol production from agricultural residues of rice and sweet sorghum in Kenya3
Microwave-Mediated Hydrothermal Carbonization (MWHTC) of food waste for conversion-ready feedstocks3
A comprehensive thermal and analytical characterization study on biofuel produced from pyrolysis of gingergrass at different operating conditions3
Investigation of canola oil-diesel blend with an antioxidant in a DI diesel engine: performance and emission analysis3
Exploratory characterization of biodiesel produced from Irvingia gabonensis kernel oil using in-situ acid-catalyzed versus conventional KOH-catalyzed tra3
The biofuel paradigm: a resilience strategy for energy security and community empowerment in pine-dominated forest management of the Indian Himalaya3
Optimization of substrate mixing ratios for the anaerobic digestion of chicken manure and slaughterhouse waste: a case study of Irvine’s Zimbabwe (Pvt) Ltd, Zimbabwe3
Gut microbiota of cattle and horses and their use in the production of ethanol and lactic acid from timothy hay3
Results of the hydrogenation of bio-crude oil produced from army food waste through hydrothermal liquefaction3
Production of fermentable glucose from the hydrolysis process of cellulose algae waste using fungal cellulases3
Characterization of hybrid charcoal briquettes from date palm and pistachio residues and bio-based binders3
Cocoa byproduct utilization in the bioeconomy: a review of waste-to-resource strategies3
Production of novel biodiesel from inedible Maesa lanceolata seeds, process optimization using response surface methodology, characterization, and GC-MS analysis3
Experimental investigation of NO x emission control using carbon nanotube additives and EGR configuration on CRDI engine fueled with ternary fuel3
A modeling framework for determining true biomass potential in Nigeria3
Modeling and simulation of anaerobic digestion-gasification integration using MADRL–FAHP3
ASPEN plus modelling of air-CO2 and air-steam-CO2 gasification of Parthenium hysterophorous for hydrogen and carbon monoxide rich syngas production3
Is biofuel production leading to a surge in fertiliser use in the United States? Evidence from a TVP-VAR model3
An investigation into the use of West Indian Bayleaf ( Pimenta racemosa ) extract as a green corrosion inhibitor for biodiesel fuel and methanol blends i3
Application of passion fruit seed meal in alternative biodiesel purification process: study of glycerol adsorption mechanism and incorporation into polymeric membrane3
Performance optimization of gasoline engine fueled with ethanol/n-butanol/gasoline blends using response surface methodology3
Biodiesel production from waste cooking oil using KOH/HY-type nano-catalyst derived from silica sand3
Kinetic evaluation of Pachira aquatica Aubl biomass slow pyrolysis towards to biochar production3
Optimization strategies for bioethanol production from sweet lime peel waste: a study on simultaneous saccharification and fermentation with co-cultures3
2-D CFD modeling of gasification of a large biomass char particle in CO 2 environment3
Bioenergy as a path to reducing fires: the role of recovering agroforestry residual biomass from the citizens’ perspective3
Influence of processing parameters on the quality of cocoa pod husk biomass pellets3
Bioethanol production from dilute fruit wastes using sorghum as additional fermentable sugar3
Impact of geometric variables on the functionality of downdraft biomass gasifiers across diverse dimensions3
Research on the usability of various oxygenated fuel additives in a spark-ignition engine considering thermodynamic and economic analyses3
Catalytic valorization of biodiesel-derived glycerol to high-value chemicals: advanced catalysts, mechanisms, and process engineering3
Solar irradiation-driven synthesis of biodiesel from composite oil using biomass catalyst and process parameters optimization3
Catalytic conversion of chicken fats into fuel grade hydrocarbons3
Effect of alkali on fulvic acid extracted from peat methane fermentation residue3
Electrogenic properties of Bacillus paramycoidesNBPP1 strain as a biocatalyst in the microbial fuel cell3
A review on the production of biodiesel from waste cooking oil: a circular economy approach3
The influence of single and multi-carbon nanotubes as additives in diesel-biodiesel fuel blends on diesel engine combustion characteristics, performance, and emissions3
Experimental study of the impacts of sustainable corrosion inhibitor on aluminum in diesel biodiesel ethanol blends3
Comparative study on saturated and unsaturated fatty acid methyl esters (FAME) composition in biodiesel production from waste soybean, sunflower, and canola oils3
Performance, evaluation and gas emission of diesel and distilled biodiesel blends in IC engine3
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