UCR To track emissions in California, test equipment sits atop a Komatsu hybrid excavator. UCR A D7E dozer is tested in California. Related Links: Do Hybrid Construction Machines Pollute More? Volvo Dials Back Hybrid Wheel Loaders, Citing Cost Concerns For Excavators, Hydraulic Is the New Hybrid A two-year study of hybrid construction vehicles reveals that while the machines offer significant savings in fuel consumption and greenhouse-gas emissions, they produce higher levels of smog-forming pollutants than their conventional diesel counterparts. The results have come as a surprise to scientists, who say the machines will require further engineering to integrate their diesel-electric
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.