In the process of tightening up and screwing off the iron roughneck, it is required that the center of clamping pliers and the center of drill pipe are coincident, so as to avoid the damage of the circular guide in clamping system, and to ensure the iron roughneck work normally. While the traditional method of centering is artificial in iron roughneck, its precision is low, so it is easy to dam...

BACKGROUND Piezosurgery is a relatively new osteotomy technique using microvibrations of scalpels at ultrasonic frequencies to perform safe and effective osteotomies without damage to adjacent soft tissue, which is widely used in spinal, oral, and maxillofacial surgery. We hypothesized that such a device could also be useful in cervical laminoplasty. The purpose of this study was to compare the...

Background: In 2008, the Southern California Earthquake Center in collaboration with the U.S. Geological Survey Earthquake Hazards Program launched the first annual Great ShakeOut, the largest earthquake preparedness drill in the history of the United States. Materials and Methods: We collected online survey data from 2052 campaign registrants to assess how people participated, whether audience...

The assessment of interlimb asymmetry has been interest to researchers and practitioners who desire maximize sport performance. aim this study was explore the relationships between Combine-related performance testing in collegiate American football players. Twenty-four skill position players (e.g., running backs, defensive wide receivers) from a Division II university completed all study-relate...

The San Francisco, California, bay area is subject to continuous seismic risk. One particular response has been the development of community-based training programmes designed to teach residents basic emergency response skills. Citizens are taught emergency medical techniques, search and rescue, fire suppression and other fundamental response skills. Current estimates in the Bay Area place the ...

INTRODUCTION We conducted a biomechanical study comparing cerclage wiring using a power tool with the traditional manual method. MATERIALS AND METHODS Our study consisted of 4 experimental arms based on the method of fixation and diameter of wires. The 4 arms were: 1) power tool method using 0.8 mm cerclage wires, 2) power tool method using 1.0 mm cerclage wires, 3) conventional manual method...

external fluted feed rolls are commonly used in grain drills. the fluted feed roll meters a volume of seeds and does not singulate the seeds as do the precision planters; therefore, there will be inherent variation in the number of seeds delivered per unit of time. this research was conducted to investigate the effect of seed meter drive shaft and ground speeds and outlet positions in a grain d...

objective: generated acoustic trauma by suction and drill may cause sensorineural hearing loss after tympanomastoid surgery. this study was carried out to determine the relationship of sensorineural hearing loss and chronic otitis media surgery at ahvaz jundishapur university of medical sciences in iran. material and methods: this prospective study included 386 patients of chronic middle ear di...

We present a drilling method that is based on the phenomenon of local hot spot generation by near-field microwave radiation. The microwave drill is implemented by a coaxial near-field radiator fed by a conventional microwave source. The near-field radiator induces the microwave energy into a small volume in the drilled material under its surface, and a hot spot evolves in a rapid thermal-runawa...

The habitats of plants change through time, and the plants change with them. Plants, in fact, are able themselves to change various aspects of the environment they inhabit. Succession occurs because altered environmental conditions favour certain species, which therefore can compete more successfully than before for nutrients, light, space and many other factors. As a result, populations of wel...