A computational study has been carried out to investigate smouldering ignition and propagation in polyurethane foam. The one-dimensional, transient, governing equations for smouldering combustion in a porous fuel are solved accounting for improved solid-phase chemical kinetics. Forward and opposed smouldering modes are examine and the model describes well both propagation modes. Specifically, t...

BACKGROUND Screw length pertains to stability in various orthopedic fixation devices. There is little or no information on the relationship between plate pullout strength and screw length in anterior lumbar interbody fusion (ALIF) plate constructs in the literature. Such a description may prove useful, especially in the treatment of osteoporotic patients where maximizing construct stability is ...

A 150 News | Forum flame retardants exposure to tdCPP appears Widespread At a time of growing debate over the safety and usefulness of flame retardants added to consumer products, 1 new evidence is emerging about the breadth of human exposure to one of the most widely used of these compounds. Two new studies 2,3 document the presence of the flame retardant tris(1,3-dichloro-2-propyl) phosphate ...

Interface pressure mapping (IPM) is a clinical tool that assists the selection of seat cushions for pressure management for wheelchair users. Clinical pressure measurements are almost always made under static sitting conditions, although this does not consider the time-dependent properties of some cushion materials that may behave differently under the dynamic conditions of self-propulsion. Thi...

A study on the use of chemical conversion coating as a preparative technique for foam-based structured catalysts, in water gas shift reaction, is presented. The results showed significant correlation between textural properties structure and preparation technique, highlighting how suitable highly porous structures. In first part paper, performance two catalysts obtained by commercial aluminium ...

Vehicle vibration exposure has been linked to chronic back pain and low back symptoms among agricultural tractor drivers. The objectives of this study by the National Institute for Occupational Safety and Health (NIOSH) were to assess driver whole body vibration (WBV) exposures and recommend interventions to reduce the risk of back related injuries, particularly relative to vehicle jarring/jolt...

S reduce mortality of road traffic collisions mainly by reducing the severity of head injuries.1,2 Nevertheless, they can cause specific intra-abdominal and vertebral injuries.2 We found one report in the literature addressing the relationship between anterior dislocation of the restrained shoulder and seatbelts.3 We recently treated a restrained driver and a restrained front-seat passenger who...

Evaluating periodontal tissue condition is an important diagnostic parameter in periodontal disease. Noncontact electromagnetic vibration device (NEVD) was previously developed to monitor this condition using mechanical parameters. However, this system requires accelerometer on the target tooth. This study assessed application of laser displacement sensor (LDS) to NEVD without accelerometer usi...

To prevent wound dehydration and bacterial penetration, a wound dressing should be occlusive, but on the other hand it should also be permeable for wound exudate to prevent bullae formation. To meet these requirements a new type of polyurethane wound dressing which consists of a microporous top layer (pore size less than 0.7 mum) supported by a sublayer with a highly porous sponge-like structu...

[Purpose] The purpose of this study was to evaluate pressure redistribution on the supporting area of healthy volunteers when using different cushions. [Subjects and Methods] Twenty healthy individuals ranging in age from 19-23 years old and 20 older adults age 60 or above participated in the study. All participants lived in urban communities in South Korea. Group differences according to gende...