Suchergebnisse

Achieving multi-million-hectare commitments from countries around the world to restore degraded lands in resilient and sustainable ways requires, among other things, huge volumes of tree planting material. Seed systems encompassing all forest reproductive material (e.g., seeds, cuttings, stakes, and wildings), are key to ensuring that sufficient planting material with a diverse range of suitable species, adapted to local conditions and capable of persisting under a changing climate, is available for restoration projects. The ideal structure of a seed system integrates five components: seed selection and innovation, seed harvesting and production, market access, supply and demand, quality control, and an enabling environment. We propose 15 indicators to evaluate these key components and trial them by assessing national seed systems in 7 Latin American countries. We conclude that the indicators enable a straightforward assessment of the strengths and weaknesses of national seed systems, thus assisting governments to identify key areas for improvement and opportunities for horizontal learning

The CGIAR Research Program on Forests, Trees and Agroforestry (FTA) organized over 10 days from 14 to 25 September 2020 its decadal conference. The fully digital event titled Forest, trees and agroforestry science for transformational change gathered more than 500 scientists from the programme and its working partners, from 69 countries across the globe, with more than 100 presentations and 40 posters. The conference also featured a set of science – policy – implementation panel discussions, including around controversial issues, with high profile scientists and key stakeholders, as well as a series of keynote speeches. The present publication gathers the 179 abstracts accepted for the conference. It constitutes a vivid illustration of the research developed by the program and its collaborative partners worldwide. All the material and presentations over the course of the 10-day conference is freely accessible on the FTA website: https://www.foreststreesagroforestry.org/ fta-2020-science-conference-forests-trees-and-agroforestryscience- for- transformational-change/

Hydropower -- Lesotho Highlands Water Project: design and layout of underground works for 'Muela Hydropower Project -- Design and construction of the cooling water intake tunnel system for Point Aconi generating station, Nova Scotia -- Comparison of two classification systems as applied to the Alpe Devero tunnel, Italy -- Metro/Rail -- Planning and design of tunnels for the Jubilee Line extension, London -- New St Clair River tunnel, Canada-USA -- Application of NATM to design of underground stations in London Clay -- Water/Waste -- Underground works on Third Nairobi Water Supply Project -- Design and construction of caverns for an underground sewage treatment plant, Hong Kong -- The Snake: a rock tunnel for storing combined sewage water, Stockholm -- Tunnelling on the Penzance and St. Ives sewerage scheme, Cornwall, England -- Tunnel-boring Machines -- Two tunnel-boring machines for Lesotho: a design and case history -- Open TBM tunnelling in complex geology for railroad in Sweden -- Use of sedimentary rock impact indices in evaluation of tunnel-boring machine performance -- Development and performance of tunnel-boring machines on Phase II of the London Water Ring Main -- Environmental Issues -- Environmental planning for the Massachusetts Water Resources Authority's MetroWest water supply tunnel -- Palais Bernheimer in Munich: tunnelling for parking space under a historic building -- Limiting the damage to historic buildings due to tunnelling: experience at the Mansion House, London -- Compensation grouting to limit settlements during tunnelling at Waterloo Station, London -- Ground movement model validation at the Heathrow Express trial tunnel -- Case Histories -- Gjøvik Olympic Mountain Hall, Norway -- Construction of new escalator shaft and passageways at London Underground's Waterloo Station -- Water in TBM drives, Delivery Tunnel South, Lesotho Highlands Water Project -- Tunnel-boring Machines -- CEN safety standards for tunnelling machines and air locks -- Tunnels below waste disposal tips -- Machine tunnelling in the northwest of England -- EPB-shield tunnelling for the Taipei Metro, contract 201A -- TBM drive management by use of computerized systems -- Research -- Long-term measurements of loads on tunnel linings in overconsolidated clay -- Non-destructive investigation of tunnels -- Case Histories -- Design, construction and performance of a 700-m 'cover and cut' tunnel in soft clay, Norway -- Shotcrete in the construction of Pen-Y-Clip tunnel, North Wales -- Face support for a large Mix-Shield in heterogeneous ground conditions -- Design -- Tunnel ring design, development, testing and manufacture for the London Water Ring Main -- Medway tunnel detailed design -- Developments in precast concrete tunnel linings in the United Kingdom -- Case Histories -- Channel tunnel: French undersea crossover design and construction -- Design and construction of Metsovon road tunnel, Greece -- Construction of the 'Passante Ferroviario' link in Milan, Italy, lots 3P, 5P and 6P: excavation by large earth pressure balanced shield with chemical foam injection -- Pen-Y-Clip road tunnel, North Wales: achieving a dry lining through a pervious rock formation -- Hydropower -- Tunnel design in the design and construct context—the Pergau experience, Malaysia -- Serra da Mesa project, Brazil: excavation of shafts and penstocks -- Tunnel Machinery -- Rock cutting with roadheaders -- Increased productivity in construction of civil and mining tunnels through the use of high-capacity tunnel-boring machines and continuous belt conveyor muck haulage.