abstract introduction: this study was aimed at assessing the effect of a new thoracolumbar orthosis on patients with scheuermann's kyphosis referred to iran medical university of tehran in collaboration with a clinic of technical ortopedea in isfahan. material and method: this new version of orthosis had a dynamic system as compared to previous ones which enabled the spine to extend. a question...

the angle of repose of soil particles is an important factor for determining critical shear stress for initiation of soil particles motion during the erosion process. there are different methods for measuring the angle of particle repose and the result of each method is somewhat different from those of the others. sliding and fixed-base piling methods are the two most common methods in the lite...

monte carlo simulation is widely used in calculations involing transport of photons through different materials of different shapes. the method consists of randomly generating a finite set of photon histories over which the quantities of interest are averaged. in photon transport calculations, sampling the photon scattering angle from the klein-nishina probability distribution is of special imp...

Introduction: Nowadays,  considerable developments  in  the field  of  radiotherapy have  been  achieved.  They  include  the  advances  made  in  the  equipments  and  treatment  planning  techniques  which  require  highly complex calculations. Such achievements have made it possible to treat cancer patients not only  with  higher  radiation  dose  but  also  with  higher  precision  and  con...

measurements of the tilt angle of potential fields can be a useful aid to their interpretation. there are several varieties of the methods in use, such as tilt angle, and the derivative of tilt angle. tilt angle filters are used for exact edge detection of the rectangular bodies artificially by writing a matlab code. the gravity effects of these models are computed by standard algorithms. the e...

This paper considers the coupled formation control of three mobile agents moving in the plane. Each agent has only local inter-agent bearing knowledge and is required to maintain a specified angular separation relative to both neighbor agents. Assuming the desired angular separation of each agent relative to the group is feasible, then a triangle is generated. The control law is distributed and...

This paper presents a cyclic pursuit based strategy for monitoring a stationary target with multiple autonomous vehicles. The strategy needs only bearing angle information of the target and that of only one of the neighbor vehicle. We have considered simple kinematic model for each vehicle. With the proposed control law, at equilibrium the vehicles get into a rigid polygonal formation which rot...

In quantitative ultrasonic flow measurements, the beam-to-flow angle (i.e., Doppler angle) is an important parameter. An autoregressive (AR) spectral analysis technique in combination with the Doppler spectrum broadening effect was previously proposed to estimate the Doppler angle. Since only a limited number of flow samples are used, real-time two-dimensional Doppler angle estimation is possib...

objective: this study was designed to compare the stress produced at the pdl of abutment teeth with two angles of cervical convergence, in otherwise similar settings. materials and methods: two finite element models were designed for a second premolar and a removable partial denture frame containing an i-bar clasp. maximum principal stress (s1) and von mises stress (seqv) were assessed along a ...