Two methods commonly used to measure the normal spring constants of atomic force microscope cantilevers are the added mass method of Cleveland et al. @J. P. Cleveland et al., Rev. Sci. Instrum. 64, 403 ~1993!#, and the unloaded resonance technique of Sader et al. @J. E. Sader, J. W. M. Chon, and P. Mulvaney, Rev. Sci. Instrum. 70, 3967 ~1999!#. The added mass method involves measuring the chang...

Dipygus is a teratological fetus with a double pelvis, genitals, and extremities. Congenital duplications in cattle are rare. Caudal duplication is more common in sheep and pigs while cranial duplications seem to be predominant in cattle.Asymmetric or parasitic conjoined twins consisting of an incomplete twin (parasite) attached to the body of a fully-developed twin (autosite).This report deals...

The possibility of suppressing self-excited vibrations of mechanical systems using parametric excitation is discussed. We consider a two-mass system of which the main mass is excited by a ow-induced, self excited force. A single mass which acts as a dynamic absorber is attached to the main mass and, by varying the stiiness between the main mass and the absorber mass, represents a parametric exc...

The flow of fluid past a cylinder has been widely studied both analytically and numerically, and provides insight to the behavior of flow given different fluid properties. Particularly interesting is the transition from steady flow to vortex shedding in the wake of the cylinder. This behavior is dependent on several parameters, but most importantly, the Reynolds number (Re), which is a dimensio...

In our investigation, we used Hamiltonian dynamics to model two different spring-pendulum systems in MATLAB. First, we confirmed that chaotic motion is possible in the classic single spring-pendulum system in two dimensions and without damping. Next, we modified the system by attaching the mass to two springs (Figure 1b) and tested to see how the dynamics change with the addition of this second...

Robot dynamics is required for simulation, control, analysis of robot motion planners and controllers. There are a number dynamic modelling investigations robots with the different approaches these mostly focus on link flexibility, joint friction or actuator dynamics. In addition to that studies present model without any attached linear torsion springs. this study, two-link rigid manipulator sp...

This paper introduces an adaptive component to a mass-spring system as used in the modelling of cloth for computer animation. The new method introduces non-active points to the model which can adapt the shape of the cloth at inaccuracies. This improves on conventional uniform mass-spring systems by producing more visually pleasing results when simulating the drape of cloth over irregular object...

This paper introduces a new method of generating 2D flat patterns from a 3D triangulated surface by opening the bending configuration of each winged triangle pair. The flattening can be divided into four steps. First, a 3D triangulated surface is modeled with a mass–spring system that simulates the surface deformation during the flattening. Second, an unwrapping force field is built to drive th...