This paper introduces an optical measurement system for shock wave characteristics. The system works by mountinga metal plate attached to spring mounts against the shock wavefront. This set is sealed and can plot the shock wave pressure diagram by measuring plate's displacement, radiation and changing the reflection of light during shock wave conflict, and converting these optical data to volta...

We have set about the goal of developing a bungee jump system that will provide an ideal experience for a falling egg by maximizing the passenger’s free fall time, minimizing the force it experiences during deceleration, and not allowing the passenger to hit the ground. In order to develop an ideal bungee system, we must first determine the properties of our bungee cord. Under the assumption th...

The simple harmonic vibration, damping vibration and forced vibration of an oscillator attached to the massless spring are always discussed in general mechanics courses. In this article, we focus on the heavy-spring conditions. We first investigate the general situation where both viscous resistance and applied force are considered under the perspective of the renormalization group theory. Then...

objectives: attached gingival width (agw) is an important marker for diagnosis of periodontal disease and normal gingival sulcus depth (gsd) is a sign of healthy periodontium. the aim of this study was to determine the agw and gsd in3-15 year-olds with three dentition systems in isfahan in 2001.   methods: a total of 360 students (120 students in each system) eligible for this cross sectional s...

An improved mass-spring model for a dripping faucet is presented. The model is constructed based on the numerical results which we recently obtained from fluid dynamical calculations. Both the fluid dynamical calculations and the present mass-spring model exhibit a variety of complex behavior including transition to chaos in good agreement with experiments. Further, the mass-spring model reveal...

Mass-spring systems are often used to model anatomical structures in medical simulation. They can produce plausible deformations in soft tissue, and are computationally efficient. Determining damping values for a stable mass-spring system can be difficult. Previously stable models can become unstable with topology changes, such as during cutting. In this paper, we derive bounds for the damping ...