Large scale laboratory experiments concerning breaking wave propagation over a fixed-bed, barred beach were performed. The primary observations of interest were video intensity time series obtained from a set of high-resolution video cameras in order to study the onset of wave breaking in shallow water and wave roller transformation in the surf zone. The approach is new in the sense that the an...

This article describes an end-effector and a method for manipulating deformable objects with undefined shapes and geometry such as sacks and bags. The first prototype end-effector, designed for applications in the U.S. Postal Service, comprises two parallel rollers with gripping sur-faces, where the rollers are pushed towards each other. When the end-effector comes onto contact with any portion...

This paper discusses the mechanical design and simulation of a novel omnidirectional wheel based on Reuleaux-triangles. The main feature of our omniwheel is that the point of contact of the wheel with the floor is always at the same distance from the center of rotation. This produces smooth translational movement on a flat surface, even when the profile of the complete wheel assembly has gaps b...

OBJECTIVE: Recent claims suggest foam rollers are useful in self-myofascial release and are a stretching technique used by health care professionals to treat patients with a variety of soft tissue conditions including muscle tightness. The purpose of this study was to determine if foam rollers are beneficial in gaining range of motion (ROM) in the hamstring muscle group. DESIGN AND SETTING: All...

We discuss a new diagnosis system combining wavelet analysis techniques and probabilistic classifiers for detecting tramway rollers defects. A continuous wavelet transform is applied on the vibration signals measured by specific accelerometers located on the rail. A temporal segmentation of the signals is carried out in order to identify the contribution of each pair of rollers to the overall v...

A new method for the isolation of the nuclei from plant tissue has been devised. This method consists in passing the plant tissue through a set of spring-loaded, counter-rotating rollers and collecting the liberated nuclei in sucrose solution containing calcium ions. A semi-automatic machine which couples the rollers with a special tissue chopping device has been constructed. It has been shown ...

Microneedling is a minimally invasive procedure that is becoming widely utilized in dermatology. Microneedles (MNs) are fine, needle-like structures that penetrate the skin. MNs can be used for percutaneous collagen induction (PCI) therapy and to augment transdermal drug delivery. This review is a primer on microneedling for dermatologists. It provides an overview of the history, instruments, p...

The geometric homogeneity of rollers, namely the dimension and shape deviations among rollers in a roller bearing, is one most important manufacturing errors. However, to best authors’ knowledge, no specified investigation has been carried out on effects friction torque tapered bearings (TRBs). By introducing diameter deviation distribution form with deviation, this study presents mathematic mo...

This article presents the results of work related to design, analysis and selection 3D printed mecanum wheels. Initial CAD model does not include material type rollers. Rollers were in 4 types filament: PLA, ABS, PETG, FLEX. Analysis, tests target destination use allowed choose best for rollers which will meet usage requirements. Next step after roller assembly Wheels tested on simple platform....