We present a theoretical study on how dynamic radiation force of acoustic waves actuates on absorbing spheres. We consider the radiation force is generated by the difference-frequency component of a bichromatic plane wave in a lossless fluid. We analyze the spectrum of the dynamic radiation force for polymethymethacrylate (lucite) and polyethylene spheres. Results reveal that absorption cause t...

This thesis concerns absorbing wave machines where the absorption strategy is based on a force-feedback approach. A theoretical model, describing their behaviour correct up to second order, is developed. At first order, this model seeks to provide a theoretical transfer function, linking the demand signal to the amplitude of the desired progressive wave. In the context of force-controlled wave ...

In this paper, the Doppler shift of light is used to manipulate the change in optical path length using the classical interferometer. From which, the change in optical path length is related to the change in impact force, where finally the last of impact force can be related to the gel sheet absorption.

In this study, the deformation and energy absorption characteristics of a novel hybrid tube is investigated both experimentally numerically. The architecture proposed composed an inner conventional co-axially arranged outer auxetic tube. Quasi-static compressive tests were conducted on tubes, tubes tubes. A three-dimensional digital image correlation technique was used to monitor evolution radi...

Total-energy pseudopotential calculations are used to study the imaging process in non-contact atomic force microscopy on Si(111) surfaces. The atomic resolution seen in some parts of the experimental images is attributed to the onset of covalent bonding between a localized dangling bond on the atom at the apex of the tip and the dangling bonds on the adatoms in the surface. This interaction do...

Atomic force microscopy studies have been performed on GaAs (001) homoepitaxy Rlrns grown by molecular beam epitaxy. Multilayered features are seen to evolve when the growth conditions favor island nucleation. As the epilayer thickness is increased these features grow in all dimensions but the angle of inclination remains approximately constant at 1”. The mounding does not occur on surfaces gro...

Nanoparticles of a bicalutamide nanosuspension were imaged using Atomic Force Microscopy (AFM) to gain some insight into particle size and aggregation. Particles of bicalutamide in a PVP-stabilised suspension were imaged and the data analyzed. The particles were observed to be uniform in size at down to 160 nm in diameter although some larger aggregates were observed. Sample roughness was analy...

Nanomachining of thin polymer resist films with an atomic force microscope (AFM) is a promising route for the fabrication of nanoscale devices. In order to enhance the controllability of the nanomachining process an in-plane acoustic wave is coupled to the sample support. This enhances the intermittent force exerted by the AFM tip. The lateral resolution reached by this method is only limited b...

We present results of Niobium based SQUID magnetometers for which the weak-links are engineered by the local oxidation of thin films using an Atomic Force Microscope (AFM). Firstly, we show that this technique allows the creation of variable thickness bridges with 10 nm lateral resolution. Precise control of the weak-link milling is offered by the possibility to real-time monitor weak-link cond...