Background and Aims: Most children get a lot of anxiety while they visit a dentist. The most important factor in the child's fear at the beginning of treatment is the syringe and needle. Ways to cope with this anxiety include behavioural control techniques such as mental regeneration, distraction, and induction. The purpose of this study was to compare the pain and anxiety in children when usin...

In a paper by Stubblefield and Brinkley (I), the authors raise the question whether the observed frequencies of three categories of sections through centrioles are consistent with the assumption of random orientation of the centriole in a sectioned cell. In order to test this assumption we will compute the expected frequencies, which requires only elementary calculus, and compare them with the ...

Abstract In general two basic methods are used for controlling the velocity of a hydraulic cylinder. First by an axial variable-displacement pump for controls flow to the cylinder. This configuration is commonly known as a hydrostatic transmission. Second by proportional valve powered by a constant-pressure source, such as a pressure compensated pump, drives the hydraulic cylinder. In this stud...

The idea of using acoustically induced Doppler spectra as a means for target detection and identification is introduced. An analytical solution for the calculation of the bistatic scattered Doppler spectrum from an acoustically excited, vibrating metallic circular cylinder is presented. First the electromagnetic scattering solution of a slightly deformed circular cylinder is obtained using a pe...

This work investigates the position control of an underactuated mechatronic system for straight needle insertions in soft tissues. The consists a pneumatic cylinder pushing slender supported at base and subject to external forces tip due interactions with dynamics is described by rigid-link model controller design purposes. main contribution this new energy shaping law that: (i) does not rely o...

This function / is called the ^-cylinder function for P. It can be seen that a semicylinder is a 1-cylinder. In [5], properties of ^-cylinders and their relationship to cylinders were explored, and subsequently it was shown that: (i) for each n > 1, the class of all (n+ l)-cylinders is a proper subset of the class of all cylinders, and (ii) a set is a cylinder if and only if it is an ^-cylinder...

Results are reported of an experimental investigation into the motion of a heavy cylinder free to move inside a water-filled drum rotating around its horizontal axis. The cylinder is observed to either co-rotate or, counter-intuitively, counter-rotate with respect to the rotating drum. The flow was measured with particle image velocimetry, and it was found that the inner cylinder significantly ...

The original protocol for implant prosthesis recommends the use of a gold framework for acrylic and ceramic prosthesis. However, due to its high cost, the use of alternative alloys is desired. This study compares the marginal accuracy of pre-made cylinders versus plastic cylinders cast with two different base metal casting alloys. Five samples each of (1) plastic cylinder cast in cobalt-chromiu...