DTH is short for “down-the-hole”. Since the DTH method was originally developed to drill large-diameter holes downwards in surface-drilling applications, its name originated from the fact that the percussion mechanism followed the bit down into the hole. Applications were later found for the DTH method underground, where the direction of drilling is generally upwards instead of downwards. [pdf]
Drilling rig engineers oversee the planning and management of oil-rig drilling operations for petroleum companies. They are responsible for designing, operating, and maintaining various drilling equip. [pdf]
There are two basic types of screw compressor: oil-injected and oil-free. Oil-injected rotary screw compressors are the most common, since they are the cheaper ones of the two types. Oil-free screw co. [pdf]
In 2005, the standing committee of the passed a law that requires Chinese power grid enterprises to purchase all the electricity produced by the renewable energy sector. Chinese developers unveiled the world's first permanent Maglev wind turbine at the Wind Power Asia Exhibition 2006 held in Beijing. [pdf]
[FAQS about What are the wind measures in China]
In August 2012 a peace agreement was signed between the government and the . On 20 August 2012, an agreement was signed between a dissident faction of the CPJP, led by Colonel calling itself , and the (CPSK). Al Habib announced that, in protest of the peace agreement, the Fundamental CPJP w. [pdf]
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