To meet the demand of power head for high power deep hole directional equipment, the double motor power head was developed by combining theory with field test.The key technologies of double Protein Bars motor power head, such as chuck, box and brake device were studied, and the industrial test was carried out in Sihe Mine of Jincheng Anthracite Min
Abstract A concrete structural member when kept under sustained load presents progressive strains over time, associated to the material creep.The fresh concrete consistency, specially, exerts some effect on that phenomenon.The pioneering formulations developed to Adjustable Shelf modelling the creep of concrete are applicable, directly, to the case
Introduction Children with primary immunodeficiency disorders (PID) are more susceptible to developing viral infections and are at a substantially increased risk of developing paralytic poliomyelitis.Such children, if given oral polio vaccines tend to excrete poliovirus chronically that may lead to the propagation of highly divergent vaccine-derive
Progeroid syndromes are characterized by clinical signs of premature ageing, which may contain several diseases such as Werner syndrome, Bloom syndrome, Rothmund-Thomson syndrome, Hutchinson-Gilford progeria syndrome, and Cockayne syndrome.These disorders may also exhibit some pathological involvements reminiscent of primary mitochondrial diseases.
The histogram location approach has been proposed by Kahn (1997) to estimate the fraction of wage cuts prevented by downward nominal wage rigidity.In this paper, we analyze the validity of the approach by means of a simulation study which yielded evidence of unbiasedness but also of potential underestimation of rigidity parameter uncertainty and th