The paper presents novel design of vibration absorber with innovative features including use flexible link based mechanism at the interface tool holder and cutting tool. ensures modification dynamic force interaction damping element results in lower transmissibility. It amplification relative velocity element, which significant reduction mass used for energy dissipation. presented has advantage...

We examine the dynamics of evolution in a generic spatial model of a pathogen infecting a population of hosts, or an analogous predator-prey system. Previous studies of this model have found a range of interesting phenomena that differ from the well-mixed version. We extend these studies by examining the spatial and temporal dynamics of strains using genealogical tracing. When transmissibility ...

Yaw damper represents a major source of excitation for flexural vibration of the railway carbody. In order to reduce transmissibility of such undesired excitation, yaw damper should allow for large force transmission at low working frequencies, but should behave as vibration isolator at high working frequencies. Unfortunately, the yaw oil damper (OD), which is nowadays in service, has poor intr...

Abstract Quasi-zero-stiffness (QZS) vibration isolators have been widely studied, because they show excellent high static and low dynamic stiffnesses can effectively solve low-frequency ultralow-frequency vibration. However, traditional QZS (T-QZS) usually adopt linear damping, owing to which achieving good isolation performance at both frequencies is difficult. T-QZS exhibit hardening stiffnes...

Spatial variations in disease patterns of the 1918-1919 influenza pandemic remain poorly studied. We explored the association between influenza death rates, transmissibility and several geographical and demographic indicators for the autumn and winter waves of the 1918-1919 pandemic in cities, towns and rural areas of England and Wales. Average measures of transmissibility, estimated by the rep...

Contact lens induced ulcerative keratitis is a serious complication which can be devastating for the patient if treatment is delayed. Extended wear is the commonest cause of microbial keratitis in contact lens wear. New extended wear silicone hydrogel contact lenses have higher oxygen transmissibility so that they can be worn continuously for 30 days. They can also be used as bandage contact le...

The existence of positive epidemiological externalities from vaccination are widely accepted and motivate a variety of public policies, but we lack a sense of what affects the relative magnitude of these externalities across diseases. We analyze vaccine externalities in an integrated economic and epidemiological model in which producers have market power. A result of our model is that the margi...

The design of a vibration isolation system utilizing a method to control the effective elastic stiffness of piezoelectric materials has been realized. The vibration isolation system consists of a piezoelectric actuator and an active analog circuit with an operational amplifier. The problem of a low stability of this system is analyzed and the method for the automatic stabilization and adjustmen...