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"Motorcycles, Racing."
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Smokin' motorcycles
\"Learn about the motorcycle's beginning, the chopper phenomenon, and motorcycle racing\"--Provided by publisher.
Book
The importance of reaction time to the starting signal on race results in elite motorcycle speedway racing
The study aimed to determine whether the reaction time (RT) to the starting signal has an impact on the points scored by elite male motorcycle speedway riders, or whether it depends on the starting position (gate). Differences among junior and senior riders, and how it changes during a single match (15 heats) and in the subsequent phases of the competitive season (the main and knockout phases) were investigated. The database of reaction times to the starting signal obtained by motorcycle speedway riders was collected from a mobile application called PGE Ekstraliga ver. 1.0.66 (PGE Ekstraliga, Warsaw, Poland). The database included 1.261 results obtained by 65 male riders (age 25.9 ±7.6 years), competing in the highest league in Poland (PGE Speedway Ekstraliga) in the 2021 competitive season. Reaction time was measured using the Pegasus Speedway © telemetry system (Black Burst, Warsaw, PL). Riders scoring 3 points during a heat had the fastest reaction time (F (3,1257) = 8.90, p<0.001, η 2 = 0.02), but RT did not influence the final result of the match (p<0.130). The times differ depending on the occupied starting position (F (3,1257) = 6.89, p<0.001, η 2 = 0.02), with the fastest RT in the inner position–A compared to the B (p<0.05) and C (p <0.001) positions. Senior riders showed significantly faster RT (0.246s) compared to junior ones (0.258s) (p<0.001). The width of the starting line affects the reaction time (F (3,1257) = 7.94, p<0.001, η 2 = 0.02). In the last (15 th ) heat of the match, RT was the fastest. The fast reaction time during the start affects the scoring of more points in a heat but depends on riders’ experience, the starting position and the straight width of the motorcycle speedway stadium. Coaches should pay attention to these factors when programming training measures.
Journal Article
Design of Racing and High-Performance Engines 2004-2013
This compendium is an update to two best-selling editions published by SAE International in 1995 and 2003. Editor Doug Fehan has assembled a collection of technical papers from the SAE archive that will inspire readers to use race engine development as an important tool in the future of transportation.
eBook
Motorcycles
\"This photo-illustrated book introduces early fluent readers to the science and engineering behind motorcycles. Includes glossary and index\"-- Provided by publisher.
Book
On any Sunday
Celebrating the 50th Anniversary of the original motorcycle documentary masterpiece that features Steve McQueen and riding legends Mert Lawwill, Malcom Smith, Dave Aldana, and many others, with music by the famed Dominic Frontiere, this is without a doubt the quintessential motorcycle film of all time. This special 50th Anniversary Edition has been digitally enhanced with a remixed and remastered Dolby Digital 5.1 soundtrack by Emmy Award Winner Chris Drozdowski.
Streaming Video
A review of semantic segmentation using deep neural networks
During the long history of computer vision, one of the grand challenges has been semantic segmentation which is the ability to segment an unknown image into different parts and objects (e.g., beach, ocean, sun, dog, swimmer). Furthermore, segmentation is even deeper than object recognition because recognition is not necessary for segmentation. Specifically, humans can perform image segmentation without even knowing what the objects are (for example, in satellite imagery or medical X-ray scans, there may be several objects which are unknown, but they can still be segmented within the image typically for further investigation). Performing segmentation without knowing the exact identity of all objects in the scene is an important part of our visual understanding process which can give us a powerful model to understand the world and also be used to improve or augment existing computer vision techniques. Herein this work, we review the field of semantic segmentation as pertaining to deep convolutional neural networks. We provide comprehensive coverage of the top approaches and summarize the strengths, weaknesses and major challenges.
Journal Article
Surgical Fixation of Type 2 Navicular Fractures
Category:
Trauma
Introduction/Purpose:
The navicular plays a vital role in maintenance of the medial column of the foot and provides a pivotal function in hind foot biomechanics. Type 2 fractures demonstrate a primary fracture line from dorsolateral to plantar medial where the major fracture fragment is displaced medially. They are typically the result of high energy and are associated with poor outcome. This study reports on the demographics of a series of Type 2 navicular fractures, the operative technique employed and the subsequent outcome.
Methods:
Six patients with a Type 2 navicular fracture were identified from the theatre records. The study period was June 2014 to February 2016. All patients sustained their injuries in either high speed MVAs or motocross accidents.
All patients had surgery performed after the soft tissue envelope had settled (mean 7 days after injury). The key component to the surgical procedure was the reduction of the constant large medial fragment. This allowed simple access to the navicular for fracture reduction. The construct was supported with a bridge plate. The bridge plate was removed approximately 9 months post surgery. Final radiological follow up was at 12 months post surgery. Clinical follow up included the AOFAS midfoot score by phone questionnaire at a mean of 15 months’ post injury.
Results:
The study comprised 5 males and one female with a mean age of 22 years. In 5 patients the navicular fracture was an isolated injury, in one there was an associated cuboid fracture. None of the patients experienced any significant complications. All patients returned to work, one as a roofer and two to motocross.
AOFAS midfoot scores were obtained from all patients via a telephone conversation at a mean of 15 months’ post injury. The mean score was 70 (range 65 - 80). Radiographs at a mean of 12 months showed no loss of position and maintained alignment.
Conclusion:
Acute fractures of the navicular are uncommon and they typically result in significant long-term morbidity.
Our series demonstrate a technique which is reproducible in both maintaining the length of the medial column but also providing good access to the navicular for fracture reduction. It also results in good clinical outcomes in the short term. All our patients returned to their previous occupations with minimal symptoms.
Journal Article