The GMT-Consortium Large Earth Finder (G-CLEF) will be a cross-dispersed, optical band echelle spectrograph to be delivered as the first light scientific instrument for the Giant Magellan Telescope (GMT) in 2022. G-CLEF is vacuumenclosed and fiber-fed to enable precision radial velocity (PRV) measurements, especially for the detection and characterization of low-mass exoplanets orbiting solar-type stars. The passband of G-CLEF is broad, extending from 3500 angstrom to . This passband provides good sensitivity at blue wavelengths for stellar abundance studies and deep red response for observations of high-redshift phenomena. The design of G-CLEF incorporates several novel technical innovations. We give an overview of the innovative features of the current design. G-CLEF will be the first PRV spectrograph to have a composite optical bench so as to exploit that material's extremely low coefficient of thermal expansion, high in-plane thermal conductivity and high stiffness-to-mass ratio. The spectrograph camera subsystem is divided into a red and a blue channel, split by a dichroic, so there are two independent refractive spectrograph cameras. The control system software is being developed in model-driven software context that has been adopted globally by the GMT. G-CLEF has been conceived and designed within a strict systems engineering framework. As a part of this process, we have developed a analytical toolset to assess the predicted performance of G-CLEF as it has evolved through design phases.

With a large amount of tyres being discarded every year, the question of how to manage the end-of-life tyres (ELTs) has become a serious issue. Thus this study identifies different driving forces for this management and the most possible scenarios for the future management of ELTs. The study also compares the business as usual model with a waste hierarchy model to explore the possibilities for optimizing management of ELTs through cascading. This study collects opinions about the driving forces of ELT management from 29 experts working in the area. Important driving forces identified were: price of substitute products, recycled materials’ market, environmental legislation, and technology. This study also surveys 23 experts in the tyre area about the most possible scenarios for ELTs in 2020. One of the more believed in futures was: “Due to increasingly limited fossil fuels and a rise of sustainability awareness, applications for ELTs are growing both in material and energy recycling.” This suggests that a shift toward an equal recycling situation of ELTs among material and energy might be likely to happen by 2020. Based on the most possible scenario for ELTs in 2020, a comparison between waste hierarchy model and business as usual model has been performed. The result shows that the (cascading) waste hierarchy model would likely create more environmental benefits than business as usual model. This is done though the saving and cycling of more materials from energy recovery into material recycling.