This article presents a novel methodology conducted under controlled laboratory conditions to assess the dynamic behavior of components railway tracks by applying an unbalanced mass excitation force. The for obtaining accurate measurements, which uses different parameters, is based on device, and from these data, transmissibility mass-elastomer system estimated. For assessment behavior, sine sw...

Abstract The singularity problem brings troubles to the design and application for parallel mechanism. Currently, redundant actuation is one of useful methods solve this problem. However, faced numerous joints in a mechanism, how make quantitative criterion seeking most efficient added actuators letting mechanism passes through necessarily open issue. This paper focuses on 2R1T 3-UPU (U univers...

1. SARS coronavirus has low transmissibility at the community level. 2. Subclinical SARS coronavirus infection is rare in children.

This paper presents a low stiffness nonlinear vibration isolator using pneumatic spring with an auxiliary chamber which is shortened by LSNVI. Firstly, the mechanical model of isolator, constructed two opposite mechanisms includes load bearing mechanism (LBM) and corrected (SCM), introduced. Secondly, restoring force found. Based on this, dynamic calculated numerically. Then, curve was approxim...

The Omicron variant that caused a huge surge in COVID-19 infections worldwide has been studied terms of prevalence, infectivity, and virulency. first study conducted South Africa showed the low pathogenic nature compared to Delta original Wuhan variants. deaths, ICU admissions, length hospital stay, also need oxygen support all reduced greatly infected patients as earlier share Delhi (India) ro...

We have used electron microscopy of thin sections and experiments on isolated viroplasms to compare the properties of four strains of cauliflower mosaic virus (CaMV), three of which were partially or completely deleted in open reading frame (ORF) II. Our results confirm that this gene is required for aphid transmissibility and show that the product of ORF II influences the firmness with which v...