Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 64 for “"helmets"”.
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A materials approach to the redesign of Lacrosse helmets
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1988.
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Evaluation of the Biomechanical Performance of Youth Football Helmets
Youth and varsity football helmets are currently designed similarly and tested to the same impact standards from the National Operating Committee on Standards for Athletic Equipment (NOCSAE). Youth players have differences in anthropometry, physiology, impact exposure, and potentially injury …
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A Comparison Between Two Oblique Test Protocols for Cycling Helmets
… test protocols on two common types of cycling helmets (PVC shell-PU liner and ABS shell-EPS liner). The study revealed that falling vertically onto a curb, angled surface or motor vehicle (CEN proposed standard), resulted in a greater rotational head response and brain tissue deformation, …
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Improvement of the robustness of ballistic helmets to rifle ammunition
En este trabajo se estudian las protecciones balísticas ligeras con las que se podrían hacer un prototipo de casco capaz de detener balas de rifle de forma segura. La protección balística de la cabeza a través de los cascos presenta un nivel inferior con respecto a la protección disponible para el …
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Improving energy dissipation to lower concussion risk in football helmets
… created in part by gameplay, but also from the helmets worn by the athletes. Football helmet pads were comparatively investigated, in order to find a better alternative that can lower the amount of acceleration on the brain. A new pad system was introduced that allows for the force to be …
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Assessing the Efficacy of Bicycle Helmets in Reducing Risk of Head Injury
… most common and debilitating injuries. Bicycle helmets can reduce head injury risk and are presently required to meet safety standard certification criteria specifying a minimal level of acceptable impact protection. However, the conditions surrounding cyclist head impacts are thought to be much …
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HELMETS OFF: AN EXPLORATORY INVESTIGATION INTO THE PHILANTHROPIC ACTIVITY OF BLACK NFL PLAYERS
<p>The term philanthropist typically conjures up images of older, wealthy White males. When taking account of a more diverse population, the term generosity provides a more inclusive framework to understanding the experiences of those marginalized from the study and practice of philanthropy. Using …
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Yellow helmets : work and worth of women workers on construction sites in northern India
The participation of women in the building sector is an exception rather than a rule. Inmost countries of the world the building industry is almost exclusively the domain of men. In India a large number of women are actively involved in the construction process itself. According to 1993-94 …
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Benchmark of aerodynamic cycling helmets using a refined wind tunnel test protocol for helmet drag research
… to date, a comprehensive study of time-trial helmets has not been performed. This thesis presents aerodynamic data for the most commonly used time-trial helmets in professional cycling. The helmets were tested at a sweep of yaw angles, from 0⁰ to 15⁰, in increments of 5⁰. The helmets were …
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The Development of a Conceptual Framework for Identifying Functional, Expressive, Aesthetic, and Regulatory Needs for Snowboarding Helmets
… attitudes that impact the use of snowboarding helmets and to test statistically a proposed conceptual framework for identifying perceived importance of functional, expressive, aesthetic, and regulatory (FEAR) needs of snowboarding helmets for current snowboarders. Data for this study was …
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Development of a test method for evaluating safety helmets' ability to reduce skull fracture and brain injury risk from falls in construction
… safety helmet standards do not test safety helmets under impact conditions realistic to this injury event. Safety helmets are broadly classified into two groups: Type I, which are tested at the top of the helmet and Type II, which are tested to the top and side of the helmet. However, even …
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Identifying factors associated with bicycle helmet use behavior among college students
… and are known to be less likely to wear bicycle helmets compared to with other age groups. The study aimed to examine behaviors, attitudes, subjective norms, past bicycle helmet use, bicycle-related injury, and risk perceptions with regard to bicycle helmet use among student bicycle riders at …
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Using Laboratory Impact Devices to Quantify Football Helmet Performance
… the risk of skull fracture. Initially, football helmets were intended to protect a player against the most severe hits they would experience on the field. More recently, it has been shown that mild traumatic brain injuries, such as concussions, can induce long-term neurodegenerative processes. …
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Quantifying Postural Control, Concussion Risk, and Helmet Performance in Youth Football
… from youth football players wearing instrumented helmets allowed for characterization of the biomechanics of head impacts and concussions for this population. A youth concussion risk function was developed using head impact data collected from youth football players with medically diagnosed …
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Study of an advanced helmet liner concept to reduce TBI : experiments & simulation using sandwich structures
… attenuation of incoming shock waves in the Army helmets; however, some impacts studies were also carried out for sports helmets. Directed blast experiments in collaboration with Purdue University and numerical studies using the ConWep module available in ABAQUS v6.10 are carried out. Fluid …
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Head Impact Biomechanics and Helmet Performance in Youth Football
… players and the performance of youth football helmets. The results of the studies presented provide a foundation for researchers, football leagues, and helmet manufactures to implement changes and modifications that aim to reduce concussion risk in youth athletes. The first study presented in …
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Evaluation and Application of Brain Injury Criteria to Improve Protective Headgear Design
… appropriate for evaluating the performance of helmets and other protective equipment. Therefore, the aims of this research were to evaluate the use of different brain injury criteria and apply them to laboratory evaluation of helmets. These aims were achieved through evaluating the predictive …
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Guardian Cap Effectiveness on Reducing Impact Accelerations and Enduring Player Health at the Collegiate Football Level
… contraption and conducting impact testing on helmets equipped with a 500g sensor helped provide the necessary data to determine the effectiveness of Guardian Caps. Overall, impact testing helmets resulted in promising results in terms of the ability of Guardian Caps to reduce maximum impact …
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Evaluating the Head Injury Risk Associated with Baseball and Softball
… factor balls, infield softball masks, batter's helmets, and catcher's masks have all been integrated into baseball and softball as a means for preventing serious head injury from ball impact. The research in this thesis had four objectives: to compare the responses of the Hybrid III and NOCSAE …
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