The use of Shot-Peening as a means of Reducing Fatigue Failures in Metal Components

Shot-peening is the term used to describe the process of hammering the surface of metal machine and structural parts with relatively high velocity stream of steel or chilled iron particles.This treatment cold-works and pre-stresses the surface of the component and as a result its resistance to failure by fatigue may, under favourable conditions, he considerably improved. The process has been applied to a variety of parts and in many cases quite spectacular increases in fatigue life have been recorded. For example, Almenl gave the results of peening some typical machine components such as shafts, gears and springs which showed increases in life after peening of 400 to 1400 per cent

The phylogeny of the plantar musculature

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49596/1/1000060110_ftp.pd

should one react against the laziness of railway tracks between the passage of two trains

should one react against the laziness of railway tracks between the passage of two trains investigates the everyday as experienced in the post-industrial landscape. Through the activities of walking and mapping, fieldwork is conducted during treks that follow the route of the railroad in the Kitchener-Waterloo region. I examine detritus as post-readymade artifacts of the industrial economy that has abandoned the area. Interventions of minimal gestures engage the inherent narratives of these discarded materials. Improvised assembled sculptures mark my route as a form of wayfinding that re-appropriates the neglected urban space of the railroad right of way. Online maps document these treks as open works of art to be completed by participants as self-guided walks. The activity of walking and assembling sculptures in these marginal landscapes is a playful strategy that resists the alienation of immaterial labour in our contemporary economic context

Report On The Hexactiniæ Of The Columbia University Expedition To Puget Sound During The Summer Of 1896

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/108667/1/j.1749-6632.1901.tb55048.x.pd

MIS Distal Metatarsal Metaphyseal Osteotomy in the treatment of metatarsalgia: MOXFQ patient reported outcomes

Baer, Gillian - ORCID 0000-0002-1528-2851 https://orcid.org/0000-0002-1528-2851Introduction The aim of this paper is to present validated patient reported outcomes for MIS Distal Metatarsal Metaphyseal Osteotomy (DMMO) in the treatment of metatarsalgia. We aim to evaluate the DMMO procedure, report patient satisfaction with the operated foot and report any complications of this procedure.Patients and Methods Between 2014 and 2016, patients who had failed conservative treatment for metatarsalgia were identified in the orthopaedic outpatient clinic. Twenty four consecutive patients requiring DMMO plus/minus toe straightening were prospectively studied. Patients requiring additional procedures at the time of surgery were excluded. Patients completed the validated Manchester-Oxford Foot Questionnaire (MOXFQ) three weeks pre-operatively and 1 year postoperatively. The MOXFQ results were analysed using Paired t-tests. A supplementary question was asked regarding patient satisfaction with the operated foot.Results There were 20 women and 4 men with a mean age of 64 years (sd 8.6). Statistically significant differences were found between the pre and postoperative MOXFQ. The postoperative MOXFQ score demonstrated a poorer result for two patients, no change for two patients and improvement in 20 patients, with four of these patients recording the lowest possible score. There was a 29.5 point improvement in mean metric MOXFQ Index score. Seventy-nine percent (n=19) of patients were satisfied or very satisfied with the operated foot. The average recoil of the metatarsal heads following DMMO was M2 4.01mm, M3 4.55mm, M4 4.16mm. There was one delayed union and no non-unions. Further reported complications were a gastric bleed, pulmonary embolism (VTE), and one intra operative broken burr.Conclusion Our study demonstrates a clinically important and statistically significant improvement in patient reported outcomes following DMMO, with 79% of patients satisfied or very satisfied with this procedure. The average recoil of the metatarsal heads following DMMO was M2 4.01mm, M3 4.55mm, M4 4.16mm with one delayed union and no non-unions.https://doi.org/10.1016/j.foot.2019.10166143pubpu