Flashcards on Biofuel and Renewable Energy

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Solar energy is a renewable alternative to traditional energy sources like coal.

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Solar panels absorb light energy and transfer it to a semiconductor, generating electricity. Silicon is commonly used in solar cells.

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Organic semiconductors are being developed to reduce the cost of solar cells.

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These semiconductors are made from hydrocarbons, which are cheaper and less energy-intensive to produce than silicon-based materials.

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Decision matrices help evaluate solutions for waste-to-energy methods.

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Each criterion is assigned a weight based on importance, and scores are multiplied to determine the best solution for a given situation.

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Biogas facilities reduce greenhouse gas emissions.

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By capturing methane and carbon dioxide, biogas facilities prevent these gases from being released into the atmosphere.

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Ethanol is a common biofuel made from corn or other commercial crops.

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While ethanol reduces greenhouse gas emissions, it can lead to food shortages and increased water consumption.

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Digestate is a by-product of anaerobic digestion.

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It is used as fertilizer, returning nutrients to the soil and supporting the ecosystem.

Front

Solar panels are designed to absorb and concentrate sunlight.

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Engineers have developed coatings to increase the range of wavelengths solar cells can absorb, improving efficiency.

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Biofuel production reduces the strain on crops used for food.

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By using waste products, biofuel production allows farmland to produce more food for human consumption.

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Anaerobic digestion can process food waste and livestock manure.

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This method produces biogas and digestate, which can be used for energy and fertilizer, respectively.

Front

Decision matrices assign weights to criteria based on importance.

Back

The scores for each design are multiplied by the weights to determine the best solution for waste-to-energy methods.