Open Access Theses and Dissertations

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You searched for subject:(Visco elastic polymer). Showing records 1 – 2 of 2 total matches.

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University of Ontario Institute of Technology

1. Shivpaul, Ryan Alexander. The effects of a visco-elastic polymer glove on hand-arm vibration, muscle activity, and comfort during simulated power tool use.

Degree: 2017, University of Ontario Institute of Technology

URL: http://hdl.handle.net/10155/826 

Prolonged exposure to hand-transmitted vibration (HTV) as a result of power tools can lead to hand-arm vibration syndrome (HAVS). The effectiveness of anti-vibration (AV) gloves for the reduction of hand arm vibration remains unclear. The ability of a glove to attenuate vibration is largely influenced by the material properties and forearm muscle activity during tool use. Visco-elastic polymer (gel-based) and air-bladder AV gloves are the most common options, however the material properties of gel based options have seen little attention. The purpose of this study is to investigate vibration transmissibility, forearm muscle activity and subjective grip dexterity using a variety of gel-based compositions and designs. Participants completed six simulated hand-held power tool tasks. RMS vibration, grip force, muscle activity, and perceived levels of comfort, dexterity, onset of forearm muscle fatigue and impairment of tactile sensation were collected. Vibration attenuation was most effective along the Z axis, with properties such as decreased contact stiffness, as well as increased mass, elasticity and viscosity performing better. Further investigation of visco-elastic polymers using the ISO standardized protocol is needed. Advisors/Committee Members: Holmes, Mike, Yielder, Paul.

Subjects/Keywords: Hand-arm vibration syndrome; Muscle activity; Visco-elastic polymer; Anti-vibration gloves

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Shivpaul, R. A. (2017). The effects of a visco-elastic polymer glove on hand-arm vibration, muscle activity, and comfort during simulated power tool use. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/826

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Shivpaul, Ryan Alexander. “The effects of a visco-elastic polymer glove on hand-arm vibration, muscle activity, and comfort during simulated power tool use.” 2017. Thesis, University of Ontario Institute of Technology. Accessed March 06, 2021. http://hdl.handle.net/10155/826.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Shivpaul, Ryan Alexander. “The effects of a visco-elastic polymer glove on hand-arm vibration, muscle activity, and comfort during simulated power tool use.” 2017. Web. 06 Mar 2021.

Vancouver:

Shivpaul RA. The effects of a visco-elastic polymer glove on hand-arm vibration, muscle activity, and comfort during simulated power tool use. [Internet] [Thesis]. University of Ontario Institute of Technology; 2017. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10155/826.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shivpaul RA. The effects of a visco-elastic polymer glove on hand-arm vibration, muscle activity, and comfort during simulated power tool use. [Thesis]. University of Ontario Institute of Technology; 2017. Available from: http://hdl.handle.net/10155/826

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Université de Bordeaux I

2. Ingremeau, François. Solutions de polymères sous écoulement : liens entre propriétés microscopiques et manifestations macroscopiques : Polymer solution flows : links between microscopic properties and macroscopic behaviors.

Degree: Docteur es, Lasers, matière et nanosciences, 2013, Université de Bordeaux I

URL: http://www.theses.fr/2013BOR14874 

Ce manuscrit présente les résultats d'expériences illustrant différentes manifestations de la présence de polymères dans un écoulement. Pour chacune d'elles, nous étudions l'interaction entre la structure microscopique et l'écoulement.Lorsqu'une goutte se détache d'un capillaire, la colonne de liquide liant la goutte au capillaire doit se rompre. Pour les liquides simples, l'amincissement suit des lois universelles bien établies. La dynamique de détachement d'une goutte de fluide complexe est très différente. Pour les solutions de polymères, après une phase de décroissance rapide du diamètre de cette colonne, il se forme un long filament cylindrique entre la goutte et le capillaire. Afin de mieux comprendre comment les polymères présents en solution donnent naissance à ce filament, nous avons observé leurs conformations au cours du détachement. Ces observations confirment que l'étirement des polymères est à l'origine du ralentissement du processus de détachement. Cependant, lors de l'amincissement du filament, la distribution des longueurs reste inchangée. Ce résultat inattendu, nous a amené à mettre en place une nouvelle méthode pour estimer la viscosité élongationnelle.D'autres expériences sont présentées, l'une porte sur un effet de déplétion qui apparait lors de l'écoulement confiné d'une solution de polymères, alors que l'autre porte sur l'écoulement instable d'une solution concentrée de polymères dans une conduite rectiligne.

This work considers the interaction between a flow field and the microscopic degrees of a freedom of a polymer solution. Different flow configurations were considered.Droplet pinch off, which occurs when a drop of liquid detaches from a capillary, can be strongly modified in the presence of polymers giving rise to long and slender filaments that thin slowly in time. We here study experimentaly the dynamics of necking and the conformations of polymers during the thinning of the neck. Our results show that the slow down of the thinning dynamics is the result of polymer stretching. Moreover, during the filament thinning, the polymer length distribution remains the same. This result is unexpected and led us to introduce a new method to estimate the extensionnal viscosity which represents the polymer solution resistance to stretching.In a second flow configuration, we have observed that depletion of polymer molecules near a surface occurs when a bead approaches a plate in a polymer solution.

Advisors/Committee Members: Kellay, Hamid (thesis director).

Subjects/Keywords: Fluides complexes; Solutions de polymères; Détachement de gouttes; Viscosité élongationnelle; Adn; Déplétion; Turbulence visco-élastique; Matière molle; Complex fluid; Polymer solution; Droplet pinch off; Extensional viscosity; Dna; Depletion pf polymer; Elastic turbulence; Soft matter

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ingremeau, F. (2013). Solutions de polymères sous écoulement : liens entre propriétés microscopiques et manifestations macroscopiques : Polymer solution flows : links between microscopic properties and macroscopic behaviors. (Doctoral Dissertation). Université de Bordeaux I. Retrieved from http://www.theses.fr/2013BOR14874

Chicago Manual of Style (16th Edition):

Ingremeau, François. “Solutions de polymères sous écoulement : liens entre propriétés microscopiques et manifestations macroscopiques : Polymer solution flows : links between microscopic properties and macroscopic behaviors.” 2013. Doctoral Dissertation, Université de Bordeaux I. Accessed March 06, 2021. http://www.theses.fr/2013BOR14874.

MLA Handbook (7th Edition):

Ingremeau, François. “Solutions de polymères sous écoulement : liens entre propriétés microscopiques et manifestations macroscopiques : Polymer solution flows : links between microscopic properties and macroscopic behaviors.” 2013. Web. 06 Mar 2021.

Vancouver:

Ingremeau F. Solutions de polymères sous écoulement : liens entre propriétés microscopiques et manifestations macroscopiques : Polymer solution flows : links between microscopic properties and macroscopic behaviors. [Internet] [Doctoral dissertation]. Université de Bordeaux I; 2013. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2013BOR14874.

Council of Science Editors:

Ingremeau F. Solutions de polymères sous écoulement : liens entre propriétés microscopiques et manifestations macroscopiques : Polymer solution flows : links between microscopic properties and macroscopic behaviors. [Doctoral Dissertation]. Université de Bordeaux I; 2013. Available from: http://www.theses.fr/2013BOR14874

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