Darbas anglų kalba. Aprašomas gyvenimo ciklas tranzistorių, padarytų iš 2 medžiagų: silikono ir galio. Pradedant nuo atitinkamos medžiagos parinkimo ir baigiant utilizavimu. Introduction. Goal definition. Product description and definition of the functional unit. Assumptions and limitations. Silicon transistors. Manufacturing of the silicon wafer. Description. Environmental impact. Manufacturing process of the transistor. Description. Environmental impact. Energy consumption. Gallium arsenide transistors. Extraction of arsenic. Extraction of gallium. Manufacturing of the GaAs wafer. Description. Environmental impact. Manufacturing process of the transistor. Description. Environmental impact. Common data. Encapsulation. Transports. Application. Discards. Impact assessment. Manufacturing of wafers. Manufacturing process of the transistor. Encapsulation and transportation. Application. Conclusion.