When the air directional drilling technology is used for drilling construction, whether the screw motor can be well lubricated is a key factor affecting its life.This paper introduces two kinds of key equipment supporting the hole-outside lubrication BONE BROTH technology, and details their working principles.Combined with the use of the equipment,
The organic molecule of the title compound, C16H12N6O2·2H2O, lies across a crystallographic inversion centre.The dihedral angle between the pyrimidine and benzene rings is Knitting 80.78 (6)°.The two pyrimidine rings are parallel by virtue of the centre of symmetry.The pyrimidine and benzene rings form dihedral angles of 41.41
One of the most important effective parameters in earthquake, is behavior factor, which is depends on various factors such as structural geometric properties, structure ductility (performance level), fundamental period of the structure, damping, soil properties, earthquake characteristics (near- or far- field) and effect of higher modes.The most im