irradiance meter Articles

  • Spatial and temporal sampling of ecosystem optical properties with the UniSpec-DC

    Satellite sensors (e.g. MODIS) provide large spatial patterns with regional or global coverage (Chen, 1999). However, the coarse resolution of satellite sensors are sometimes problematic, particularly for patchy landscapes (Turner et al., 2003). To properly validate and interpret satellite imagery, additional ground remotely sensed and biophysical data are needed. The UniSpec-DC (PP Systems, ...


    By PP Systems

  • Stellio heliostat set to cut CSP tower costs by 20%

    A new heliostat modeled on South African data is using a pentagonal reflector design, innovative construction techniques and smart software to boost the cost efficiency of tower plants. Heliostat fields typically contribute about 50% of the capital investment for CSP tower plants, according to a study by SBP Sonne, the German engineering firm which has ...


    By FCBI Energy

  • 2011: A Year of Weather Extremes, with More to Come

    The global average temperature in 2011 was 14.52 degrees Celsius (58.14 degrees Fahrenheit). According to NASA scientists, this was the ninth warmest year in 132 years of recordkeeping, despite the cooling influence of the La Niña atmospheric and oceanic circulation pattern and relatively low solar irradiance. Since the 1970s, each subsequent decade has gotten hotter -- and 9 of the 10 ...


    By Earth Policy Institute

  • By the Numbers

    In a sense, metrology makes the world go around. It can quantify how long it takes the Earth to rotate, and the science of weights and measurements underpins everything from telling time to ensuring the fairness of international trade agreements. Metrologists must be extremely precise in their measurements, according to Alan Steele, Canada’s chief metrologist and the general manager of ...


    By ASTM International

  • Eco-economy indicator: past decade the hottest on record

    The first decade of the twenty-first century was the hottest since recordkeeping began in 1880. With an average global temperature of 14.52 degrees Celsius (58.1 degrees Fahrenheit), this decade was 0.2 degrees Celsius (0.36 degrees Fahrenheit) warmer than any previous decade. The year 2005 was the hottest on record, while 2007 and 2009 tied for second hottest. In fact, 9 of the 10 warmest years ...


    By Earth Policy Institute

  • Renewable Energy Projects on Contaminated Property | Managing the Risks Part II

    Part II of Renewable Energy Projects on Contaminated Property | Managing the Risks The First entry can be found at Part I Risk and Exposures in the Life Cycle of a Project The typical renewable energy project involves multiple parties: tax equity investors; equity investors; local utilities; engineering, procurement, ...

  • Non-Ionising Radiation

    Pressures on the environment may occur through chemical, physical and biological agents. The subject of this study is physical agents, where physical fields are examined. Physical fields are part of the natural environment. Depending upon their properties and the surrounding conditions, physical fields are transmitted through the spaces in which we live, potentially affecting human health and ...

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