Managing the organizational and software complexity of a comprehensive open source digital library system presents a significant challenge. The challenge becomes even more imposing when the interface is available in different languages, for enhancements to the software and changes to the interface must be faithfully reflected in each language version. This paper describes the solution adopted b...

The Greenstone digital library software is intended to help users construct simple collections of information very quickly. Indeed, only a few minutes of the user’s time are needed to set up a collection based on a standard design and initiate the building process. Collections may be large—some comprise Gbytes of text; millions of documents. Furthermore, even larger volumes of information may b...

Assuming that the period 2.75–2.65 Ga corresponds to a single, but global, geodynamic event, we investigate—through numerical experiments—the mechanisms that could have led to the profound continental reworking that occurred at that time. Although the extent of the crisis at the Earth’s surface pledges in favour of the involvement of mantle plumes, our numerical experiments suggest that the the...

Topoarele din rocă (de obicei metamorfică) de culoare verde erau considerate foarte valoroase în preistorie. Li se atașa un prestigiu special, iar rocile veneau la mari distanțe. Cunoașterea rețelei distribuție a celui mai popular tip – jadeitul luat amploare recent prin proiectul JADE 2 organizat P. Pétrequin (Pétrequin et alii 2017). În Ungaria, astfel artefacte au fost identificate și descri...

metabasites and serpentinites of the ophiolitic sequence of the gimigliano-mount reventino unit(calabria, southern italy), also known as greenstones, are employed and marketed for building and ornamentalpurposes since prehistorical times. the main topic of our research focuses on the occurrence, within the abovelithotypes, of asbestiform minerals that may be potentially harmful for human health...

By Michael Greenstone (3M Professor of Economics, Massachusetts Institute of Technology), Aparna Krishnan (Executive Director, JPAL South Asia), Rohini Pande (Mohammed Kamal Professor of Public Policy, Harvard Kennedy School), Nicholas Ryan (PhD Candidate, MIT) and Anant Sudarshan (Giorgio Ruffolo Postdoctoral Fellow in Sustainability Science, Sustainability Science Program, Harvard Kennedy Sch...

The Isua greenstone belt (Fig. 1) contains the oldest known, relatively well preserved, metavolcanic and metasedimentary rocks on Earth. The rocks are all deformed and many were substantially altered by metasomatism, but both the deformation and metasomatism were heterogeneous. Transitional stages can be seen from relatively well preserved primary volcanic and sedimentary structures to schists ...