Academic literature on the topic 'Amplitude of accommodation'

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Journal articles on the topic "Amplitude of accommodation"

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Glasser, Adrian, Machelle T. Pardue, Margot E. Andison, and Jacob G. Sivak. "A behavioral study of refraction, corneal curvature, and accommodation in raptor eyes." Canadian Journal of Zoology 75, no. 12 (1997): 2010–20. http://dx.doi.org/10.1139/z97-834.

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Since there is much speculation in the literature regarding the accommodative abilities of raptors, we undertook a behavioral study of accommodation in the five families of raptors. The resting refractive state and amplitude of accommodation were measured using infrared video photorefraction in a variety of wild-caught and captive-bred raptors. The resting corneal curvature and the extent of changes in corneal curvature during accommodation (corneal accommodation) were measured using video keratometry. External ocular and head dimensions were measured with calipers to look for correlates with
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Gyldenkerne, Anders, Nicolaj Aagaard, Malene Jakobsen, Carina Toftelund, and Jesper Hjortdal. "Changes in accommodative function following small-incision lenticule extraction for high myopia." PLOS ONE 15, no. 12 (2020): e0244602. http://dx.doi.org/10.1371/journal.pone.0244602.

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Purpose To examine whether the amplitude of accommodation, the accommodative response, and the accommodative facility is affected and correlated with changes in higher-order aberrations for patients with high myopia surgically treated with small-incision lenticule extraction (SMILE). Methods 35 highly myopic eyes (myopic spherical equivalent of at least 6 diopters) of 35 patients treated with SMILE were included. Assessments were made before and 3 months after surgery. Donders push-up-method was used to measure the amplitude of accommodation. The accommodative response was assessed using an op
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Makhova, M. V., and V. V. Strakhov. "Interaction of accommodative and subjective diagnostic criteria of accommodation disorders." Russian Ophthalmological Journal 12, no. 3 (2019): 13–19. http://dx.doi.org/10.21516/2072-0076-2019-12-3-13-19.

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Purpose: to study the relationship of accommodative (objective) and subjective criteria of different types of accommodation disorders.Material and methods. 62 patients (124 eyes) with myopic refraction, aged 10 to 18, were divided into 6 groups according to accommodation disorders types. All patients were tested objectively on a Speedy-i accommodograph, which determined the coefficient of accommodation response (CAR) and the coefficient of microfluctuations (CMF) and underwent MEM retinoscopy to determine the accommodation response. In addition, subjective methods were used to determine the am
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Ikaunieks, Gatis, Karola Panke, Madara Segliņa, Aiga Švede, and Gunta Krūmiņa. "Accommodative Amplitude in School-Age Children." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 71, no. 5 (2017): 387–91. http://dx.doi.org/10.1515/prolas-2017-0065.

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Abstract In children, intensive near-work affects the accommodation system of the eye. Younger children, due to anatomical parameters, read at smaller distance than older children and we can expect that the accommodation system of younger can be affected more than that of older children. We wanted to test this hypothesis. Some authors showed that the norms of amplitude of accommodation (AA) developed by Hofstetter (1950) not always could be applied for children. We also wanted to verify these results. A total of 106 (age 7-15) children participated in the study. Distance visual acuity was meas
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Ma, Martin Ming-Leung, Mitchell Scheiman, Cuiyun Su, and Xiang Chen. "Effect of Vision Therapy on Accommodation in Myopic Chinese Children." Journal of Ophthalmology 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1202469.

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Introduction. We evaluated the effectiveness of office-based accommodative/vergence therapy (OBAVT) with home reinforcement to improve accommodative function in myopic children with poor accommodative response.Methods. This was a prospective unmasked pilot study. 14 Chinese myopic children aged 8 to 12 years with at least 1 D of lag of accommodation were enrolled. All subjects received 12 weeks of 60-minute office-based accommodative/vergence therapy (OBAVT) with home reinforcement. Primary outcome measure was the change in monocular lag of accommodation from baseline visit to 12-week visit me
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De-Hita-Cantalejo, Concepción, María-de-los-Ángeles Benítez-Rodríguez, María Carmen Sánchez-González, María-José Bautista-Llamas, and José-María Sánchez-González. "Accommodation Response Variations in University Students under High Demand for Near-Vision Activity." Life 12, no. 11 (2022): 1837. http://dx.doi.org/10.3390/life12111837.

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The objective of this study was to investigate accommodation changes and visual discomfort in a university student population after a period of high demand for near-vision activity. A total of 50 university students aged between 20 and 22 years were recruited. The tests performed involved positive relative accommodation (PRA), negative relative accommodation (NRA), accommodation amplitude (AA), and monocular and binocular accommodative facility (MAF and BAF). Visual discomfort was measured on a scale involving a visual discomfort questionnaire (VDQ). All accommodative variables underwent chang
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Castagno, Victor Delpizzo, Manuel Augusto Pereira Vilela, Rodrigo Dalke Meucci, et al. "Amplitude of Accommodation in Schoolchildren." Current Eye Research 42, no. 4 (2016): 604–10. http://dx.doi.org/10.1080/02713683.2016.1220586.

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Kragha, I. K. O. K. "Measurement of amplitude of accommodation." Ophthalmic and Physiological Optics 9, no. 3 (1989): 342–43. http://dx.doi.org/10.1111/j.1475-1313.1989.tb00925.x.

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Yu, Hanyang, Wentao Li, Ziping Chen, et al. "Is Ocular Accommodation Influenced by Dynamic Ambient Illumination and Pupil Size?" International Journal of Environmental Research and Public Health 19, no. 17 (2022): 10490. http://dx.doi.org/10.3390/ijerph191710490.

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Purpose: We investigated ocular accommodative responses and pupil diameters under different light intensities in order to explore whether changes in light intensity aid effective accommodation function training. Methods:A total of 29 emmetropic and myopic subjects (age range: 12–18 years) viewed a target in dynamic ambient light (luminance: 5, 100, 200, 500, 1000, 2000 and 3000 lux) and static ambient light (luminance: 1000 lux) at a 40 cm distance with refractive correction. Accommodation and pupil diameter were recorded using an open-field infrared autorefractor and an ultrasound biological
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López-Artero, Esther, Francisco Poyales, Nuria Garzón, et al. "Changes in Accommodative and Binocular Function following Phakic Intraocular Lens for High and Low-to-Moderate Myopia." International Journal of Environmental Research and Public Health 19, no. 11 (2022): 6716. http://dx.doi.org/10.3390/ijerph19116716.

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The aim was to evaluate accommodative and binocular function of phakic intraocular lens implantable collamer lens (ICL) in high and low-to-moderate myopia. Prospective comparative cohort study with 38 myopic patients who underwent ICL implantation were divided into two groups of 19 patients, each one based on the spherical equivalent (SE): high-power (SE ≤ −6 D) and low-to-moderate (SE > −6 D). The push-up amplitude of accommodation (AA), monocular accommodative facility (MAF), distance and near ocular deviation, near convergence amplitude, near point convergence (NPC), stereopsis, and acco
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Dissertations / Theses on the topic "Amplitude of accommodation"

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Burns, D. H. "Investigation of a new clinical method of measuring amplitude of accommodation." Thesis, London South Bank University, 2017. http://researchopen.lsbu.ac.uk/2736/.

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Amplitude of Accommodation (AoA) is the extent of the eye's ability to accommodate, or focus over a range of distances. This thesis describes the mechanism of accommodation and reviews the literature concerning the measurement of accommodation's amplitude, its maximum range. The reasons for measuring the amplitude of accommodation, in routine clinical practice, are outlined. The aim of this study is to investigate the accuracy of a new clinical method of measuring amplitude of accommodation and to compare it to the prevalent method. Methods by which the amplitude of accommodation has been meas
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Yang, Chih Huang. "Vitamin D in dry eye and myopia." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/113952/1/Chih%20Huang_Yang_Thesis.pdf.

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Vitamin D is important to human health with a variety of systemic diseases linked to vitamin D deficiency. The effect of a two month treatment of a vitamin D oral supplement on the ocular surface in older people with dry eye and on binocular vision in younger adults with short-sightedness was assessed. Vitamin D had a beneficial effect on symptoms of dry eye in older people and improved the accommodation function in younger adults. This work suggests that the development of vitamin D eye drops might be useful for these conditions.
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Brennand, David Alexander Arthur. "Individual differences in recognition times to random dot stereograms, complex diamond stereograms and amplitude judgements in ridge stereograms : the role of tonic accommodation stereograms." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392544.

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Chaves, Daniela Pinto. "Influência da iluminação colorida nos parâmetros acomodativos em sujeitos com disfunções acomodativas." Master's thesis, 2019. http://hdl.handle.net/1822/66601.

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Dissertação de mestrado em Optometria Avançada<br>A influência da iluminação no sistema acomodativo é um tema ainda pouco explorado e cuja informação existente é relativamente antiga. Considerando a grande variedade de iluminação existente atualmente, é relevante perceber de que forma esta se relaciona com a acomodação em pacientes com disfunções acomodativas. Este estudo teve como objetivo avaliar a influência da cor da iluminação (verde e vermelho) nos parâmetros acomodativos, numa população com disfunções acomodativas, em comparação com os valores obtidos com iluminação branca. Dezass
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Mendes, Cristina João Correia da Cunha. "Variações de parâmetros acomodativos ao longo do dia." Master's thesis, 2012. http://hdl.handle.net/1822/22816.

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Dissertação de mestrado em Optometria Avançada<br>crescente uso de dispositivos eletrónicos de variados tamanhos em ambientes não ergonómicos e a exigência quer no estudo quer na atividade profissional, obriga à eficácia, rapidez e precisão no sistema visual. O estilo e a qualidade de vida influenciam o comportamento humano em que a visão é afetada provocando anomalias na visão binocular, alterações no erro refrativo e sintomatologia associada. Existem estudos longitudinais sobre estas variações. O objetivo deste trabalho foi verificar se existe alguma variação nos parâmetros acomodativ
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Adler, P., Andy J. Scally, and Brendan T. Barrett. "Test-retest reproducibility of accommodation measurements gathered in an unselected sample of UK primary school children." 2012. http://hdl.handle.net/10454/6363.

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Purpose To determine the test-retest reproducibility of accommodation measurements gathered in an unselected sample of primary school children. Methods Monocular and binocular amplitudes of accommodation (AA) were collected by five different Testers using the push-up method in an unselected sample of school children (n=137, age: 8.1±2.1-years). Testing was conducted on three occasions (average testing interval: 8-days) in 91.2% of the children. Results The median AA was 19.1D, the variation due to the identity of the Tester was 3.1D (p<0.001) and the within-subject variation (which takes the
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Book chapters on the topic "Amplitude of accommodation"

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Chung, Ida. "Testing Accommodation in Children." In The Pediatric Eye Exam Quick Reference Guide. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8044-8.ch010.

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Accommodation disorders are associated with a host of etiologies. Children with accommodative disorders can present with various symptoms including blur, fluctuating vision, eye pain, burning sensation, tired eyes, asthenopia, headaches, fatigue with near work, and excessive rubbing, blinking, or tearing. This chapter provides an overview of accommodation testing on pediatric patients in the clinical setting. The author describes the indications for accommodation testing and provides clinical pearls for testing accommodative function in children. The chapter covers the specific tests, equipment required, and step-by-step procedures for testing accommodative amplitude, accommodative response, and accommodative facility.
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Goss, David A. "Plotting Blur, Break, Recovery, and Amplitude Findings and Completing Graphs." In Ocular Accommodation, Convergence, and Fixation Disparity. Elsevier, 1995. http://dx.doi.org/10.1016/b978-0-7506-9497-1.50009-1.

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Dória Silva, Humberto, Rostan Silvestre da Silva, Eduardo Dória Silva, Maria Tamires Dória Silva, Cristiana Pereira Dória, and Cristiane Pereira Dória. "Visual Impairment Caused by Monovision Surgical Design." In Current Cataract Surgical Techniques. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95770.

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Neurophysiological anatomy of natural binocular vision shows the need to focus with both eyes to jointly produce the two corneas accommodation, correcting, in a compensatory way, the divergences inherent in the two different images, of the same visual field projected in the two distinct spaces, the two retinas. Corneal accommodation is part of the forced convection mechanism for the transfer of mobile mass in the cornea, trabecular meshwork and retina, to inhibit the accumulation of dehydrated intraocular metabolic residue, which can cause refractive errors in the cornea, obstruction of the trabecular meshwork and reduction of the amplitude of the signals produced by the phototransducers and sent to the brain. The IOL monovision surgical implantation technique differs from the physiology of natural binocular vision, which can cause after surgery disorders, described in this chapter, in that it imposes a different adaptation from the neurophysiological anatomy of human vision in addition to favoring the continuous progression of residue accumulation dehydrated intraocular metabolic and stimulate ocular.
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Eperjesi, Frank, Hannah Bartlett, and Mark Dunne. "Accommodative amplitude." In Ophthalmic Clinical Procedures. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-08-044978-4.50020-4.

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Guyton, David. "Accommodative Amplitude Measurements After Surgery for Presbyopia." In Hyperopia and Presbyopia. CRC Press, 2003. http://dx.doi.org/10.1201/b14217-27.

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Zaharia, Radu Serban M., and Rodica Manuela Gogonea. "The Impact of Seasonality on the Using of Accommodation Capacity in Operation in Romania." In Destination Management and Marketing. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2469-5.ch008.

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For accommodation service providers one of the main objectives is to obtain and maintain a higher degree of using of accommodation capacity in operation. Based on these considerations, the paper analyzes the evolution of the index of utilization of the accommodation capacity in operation in the development regions of Romania for a period of six years in order to reveal similarities and disparities between them. For this purpose, besides the analysis of the developments of the index of utilization of the accommodation capacity in operation, the evolution of dispersion spreading is also analyzed. Both the variability amplitudes of the two main indicators and their trend are analyzed. The conclusion of the study is the fact that in Romania, the dispersion of the index of the use of the accommodation capacity in operation had an increasing trend, which means that in terms of the ratio between demand and supply of accommodation, the disparities between development regions continue to grow with all the negative implications on the performance of the tourism industry in Romania.
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Ritter, Scott M., Joshua K. Meibos, and Ty S. Robinson. "Sequence Biostratigraphy of Carboniferous–Permian Boundary Strata in Western Utah: Deciphering Eustatic and Tectonic Controls on Sedimentation in the Antler–Sonoma Distal Foreland Basin." In Late Paleozoic and Early Mesozoic Tectonostratigraphy and Biostratigraphy of Western Pangea. SEPM (Society for Sedimentary Geology), 2022. http://dx.doi.org/10.2110/sepmsp.113.07.

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The stratal architecture of the upper Ely Limestone and Mormon Gap Formation (Pennsylvanian–Lower Permian) in west-central Utah reflects the interaction of icehouse sea-level change and tectonic activity in the distal Antler–Sonoma foreland basin. Nineteen stratigraphic sections correlated by physical and biostratigraphic means provide a basis for tracing Carboniferous–Permian boundary strata over a north–south distance of 60 km. These formations can be subdivided into 14 unconformity-bounded, third-order depositional sequences of differing internal architecture and regional extent. Conodonts and fusulinids provide ages for selected sequences and parasequences, permitting correlation with tectonostratigraphic units in the proximal foreland in north-central Nevada and with selected Midcontinent cyclothems. The 14 third-order sequences stack into three second-order supersequences characterized by distinctive differences in facies and facies stacking patterns, regional continuity of cycles, relative abundance of dolomite and limestone, calculated rock accumulation rates, and the frequency and inferred duration of sequence-bounding hiatuses. These reflect the effect of high-frequency sea-level change on an intermittently subsiding distal foreland shelf. Sediment accommodation was relatively high during the Bashkirian through middle Moscovian (upper part of Lower Absaroka I supersequence) and again during the late Sakmarian and Artinskian (lower part of Lower Absaroka III supersequence) as a function of continuous subsidence and high-amplitude sea-level change. During the late Moscovian through upper Sakmarian (Lower Absaroka II supersequence), however, subsidence slowed or ceased in response to tectonic activity in north-central Nevada, with concomitant development of the West-Central Utah Highlands (forebulge). During this episode of reduced subsidence, intermittent sedimentation was driven by second- and third-order eustatic fluctuations in sea level. Constituent strata form a wedge of onlapping, northward-thinning sequences and parasequences deposited during selected third-order highstands of the Lower Absaroka II second-order sea-level event. Depositional sequences in the distal foreland are bounded by low-relief disconformities of variable duration, in contrast to the angular unconformities and intensely deformed tectonostratigraphic domains that characterize the proximal foreland basin in north-central Nevada.
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Conference papers on the topic "Amplitude of accommodation"

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Sarnowska-Habrat, Katarzyna, Boguslawa Dubik, and Marek Zajac. "Measurements of accommodation amplitude in polychromatic light." In 12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, edited by Jan Perina, Sr., Miroslav Hrabovsky, and Jaromir Krepelka. SPIE, 2001. http://dx.doi.org/10.1117/12.417856.

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Franco, Sandra M., Raquel Moreira, and João M. Linhares. "The influence of coloured lighting on ocular amplitude of accommodation." In IV International Conference on Applications of Optics and Photonics, edited by Manuel Filipe P. Martins Costa. SPIE, 2019. http://dx.doi.org/10.1117/12.2527402.

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Coloma, Pilar, Inmaculada Pascual, Dolores de Fez, and Vicente Camps. "Study of measurement and calculation of the relative amplitude of accommodation." In 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, edited by Manuel Filipe P. C. Martins Costa. SPIE, 2013. http://dx.doi.org/10.1117/12.2027493.

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Schumacher, S., U. Oberheide, H. Theuer, et al. "fs-lentotomie: changing the accommodation amplitude of presbyopic human lenses by fs laser pulses." In European Conference on Biomedical Optics. OSA, 2007. http://dx.doi.org/10.1364/ecbo.2007.6632_32.

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Schumacher, S., U. Oberheide, H. Theuer, et al. "fs-lentotomie: changing the accommodation amplitude of presbyopic human lenses by fs laser pulses." In European Conference on Biomedical Optics, edited by Alfred Vogel. SPIE, 2007. http://dx.doi.org/10.1117/12.728197.

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Reilly, Matthew A. "Is Presbyopia Caused by Lens Growth-Induced Residual Stresses?" In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14528.

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Prevailing wisdom holds that increasing lens stiffness causes presbyopia. Treatments for presbyopia have therefore focused on altering the mechanical properties of the ocular lens. The present work shows an age-related decline in accommodation amplitude may be predicted without invoking changes in lens stiffness.
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Windt, Christian, Josh Davidson, Benazzou Akram, and John V. Ringwood. "Performance Assessment of the Overset Grid Method for Numerical Wave Tank Experiments in the OpenFOAM Environment." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77564.

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To maximise the energy output of wave energy converters (WECs), large structural motions are desired. When simulating WEC performance in Computational Fluid Dynamics (CFD) based numerical wave tanks, these motions must be explicitly accommodated in the computational domain. Using well established mesh morphing (MM) methods, this explicit accommodation results in deformation of control volumes (CVs)/mesh. Thus, large amplitude WEC oscillations may lead to highly distorted CVs and push MM models beyond the limits of numerical stability. While advanced numerical mesh motion methods, such as overs
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Wang, Sheng, Kangbin Lei, Xilian Luo, Kiwamu Kase, Elia Merzari, and Hisashi Ninokata. "Simulation of Eccentric-Shaft Journal Microbearing by DSMC." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78572.

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Many micromachines use rotating shafts and other moving parts which carry a load and need fluid bearings for support. Most of them operate with air or water as the lubricating fluid. The present study analyzes air microbearing represented as an eccentric cylinder rotating in a stationary housing. The fluid mechanics and operating characteristics of microbearing are different from their larger cousins. The small length-scale may invalidate the continuum approximation in Navier-Stokes equations, and slip flow, rarefaction, compressibility and other unconventional effects may have to be taken int
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Motriuk, Roman W., and Edwin Mikulcik. "Dynamic Support in Piping Systems: A Novel Design Based on Automotive Shock Absorbers." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2090.

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Complex vibration fields are observed in piping systems that are mechanically or acoustically interconnected with turbo-machinery. The magnitudes of vibrations in such systems depend on the coupling of the piping response characteristics with the excitations that are present. In cases of high vibration amplitudes, successful mechanical attenuation can be achieved by altering the piping system’s mass or its stiffness, thus detuning the piping response from the excitation. Another approach is to introduce damping into the piping system so that the vibration energy can be efficiently dissipated,
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Lessanibahri, Saman, Philippe Cardou, and Stéphane Caro. "A Cable-Driven Parallel Robot With an Embedded Tilt-Roll Wrist." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98146.

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Abstract This paper addresses the optimum design, configuration and workspace analysis of a Cable-Driven Parallel Robot with an embedded tilt-roll wrist. The manipulator is a hybrid robot consisting in an under-constrained moving-platform accommodating a tilt-roll wrist. The embedded wrist provides large amplitudes of tilt and roll rotations and a large translational workspace obtained by the moving-platform. This manipulator is suitable for tasks requiring large rotation and translation workspaces like tomography scanning, camera-orienting devices and visual surveillance. The moving-platform
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