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Physical and mechanical characteristics of composite briquette from coal and pretreated wood fines

International Journal of Coal Science & Technology 2021年第5期8卷 1088-1098页

作者： Adekunle Adeleke Jamiu Odusote Peter Ikubanni olumuyiwa lasode Madhurai Malathi Dayanand Pasawan Department of Mechanical Engineering Landmark UniversityOmu-AranNigeria Department of Materials and Metallurgical Engineering University of IlorinIlorinNigeria Department of Mechanical Engineering University of IlorinIlorinNigeria Metal Extraction and Recycling Division National Metallurgical LaboratoryJamshedpurIndia

Melina wood torrefied at 260℃ for 60 min was agglomerated with lean grade coal fines into composite briquettes using pitch as *** biomass(3%-20%)and coal fines(80%-97%)were blended together to produce the composite briquettes under a hydraulic press(28 MPa).The briquettes were cured at 300℃.Density,water resistance,drop to fracture,impact resistance,and cold crushing strength were evaluated for the composite *** proximate,ultimate,and calorific value analyses were carried out according to different ASTM *** studies were carried out using scanning electron microscope and electron probe microanalyzer equipped with energy dispersive *** Transform Infrared Spectrophotometer(FTIR)was used to obtain the functional groups in the raw materials and *** density of the composite briquettes ranged from 0.92 to 1.31 g/cm^(3) after *** with95%).The highest cold crushing strength of 4 MPa was obtained for briquettes produced from 97%coal fines and 3%torrefied *** highest drop to fracture(54 times/2 m)and impact resistance index(1350)were obtained for the sample produced from 97%coal and 3%torrefied *** fixed and elemental carbons of the briquettes showed a mild improvement compared to the raw *** peaks from FTIR spectra for the briquettes shows the presence of aromatic C=C bonds and phenolic OH *** composite briquettes with up to 20%torrefied biomass can all be useful as fuel for various applications.

关键词： Composite briquettes Lean grade coal Torrefied biomass Physico-mechanical properties Combustion properties

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Assessing Urban Land Use Change in New Braunfels, Texas from 2013 to 2020

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Journal of Geoscience and Environment Protection 2020年第12期8卷 232-243页

作者： M. K. lasode I. C. Esobi C. I. Anyanwu D. O. lasode Department of Geography Texas State University San Marcos Texas USA Department of Food Nutrition and Packaging Science Clemson University Clemson South Carolina USA Africa Regional Centre for Information Science University of Ibadan Oyo State Nigeria

Urban cities are the major drivers of economic growth and development. Economic growth and development however results in considerable land cover land use dynamics. This study assessed the dynamics in land cover land use that have occurred in New Braunfels, Texas in the last 7 years (2013-2020) to observe areas in the city that had experienced considerable shifts in land cover and land use. 30-meter resolution Landsat images were used to examine possible changes in land cover land use. New Braunfels was observed to have experienced significant changes in land use especially in developed areas. This change can be attributed to the influx of people into the city, contributing to the need for increased urban development. Analysis of this study shows that about 16% (about 553 hectares) of forest land cover class and 28% (about 1139 hectares) of grassland class in time 1 (August 31, 2013) changed to built-up land use class in time 2 (November 5, 2020). A limitation to this study was that of the spatial resolution of images used. Higher spatial resolution images could impact the producers, users, and overall accuracy assessment. Results from this study can aid in supporting better decision-making for sustainable urban development and climate change mitigation.

关键词： Change Detection NDVI Landsat Land Cover Land Use Change Urban Environment

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