Relevant bibliographies by topics / Pressure arch

Academic literature on the topic 'Pressure arch'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Pressure arch"

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Shoukas, A. A., M. J. Brunner, A. S. Greene, and C. L. MacAnespie. "Aortic arch reflex control of total systemic vascular capacity." American Journal of Physiology-Heart and Circulatory Physiology 253, no. 3 (September 1, 1987): H598—H603. http://dx.doi.org/10.1152/ajpheart.1987.253.3.h598.

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The ability of the aortic arch baroreceptors to change vascular capacity was measured and, in the same animal, compared with carotid sinus reflex changes in capacity. Seven dogs were anesthetized with pentobarbital sodium and perfused with constant flow. Changes in external reservoir volume reflected reciprocal changes in total systemic vascular capacity and changes in arterial pressure parallel changes in total peripheral resistance. The aortic arch and carotid sinus baroreceptor areas were isolated, and the pressures were controlled separately. With carotid sinus pressure held constant at 125 mmHg, aortic arch pressure was increased and decreased between 225 and 50 mmHg, and the changes in reservoir volume and systemic arterial pressure were measured. Results from increasing and decreasing aortic arch or carotid sinus pressure were not significantly different and were averaged. The mean change in reservoir volume was 1.9 +/- 0.2 ml/kg and the change in mean arterial pressure was 18.7 +/- 3.7 mmHg. The changes in reservoir volume and arterial pressure caused by the aortic arch reflex were not influenced by the level of carotid sinus pressure. Carotid sinus pressure changes between 200 and 50 mmHg at a constant aortic arch pressure caused reservoir volume and arterial pressure to change by 7.2 +/- 0.9 ml/kg and 45.1 +/- 4.1 mmHg, respectively. The level of aortic arch pressure did not modify these responses.
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Wang, S. R., X. G. Wu, Y. H. Zhao, P. Hagan, and C. Cao. "Evolution Characteristics of Composite Pressure-Arch in Thin Bedrock of Overlying Strata During Shallow Coal Mining." International Journal of Applied Mechanics 11, no. 03 (April 2019): 1950030. http://dx.doi.org/10.1142/s1758825119500303.

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Under the shallow coal mining condition and based on the cracking and movement rules of the roof in different mining stages, the mechanical models of symmetrical pressure-arch, stepped pressure-arch, rotating-squeezed pressure-arch in the mining field were established. Then, the instability criterion of each pressure-arch structure was derived. Through the similarity material experiment and numerical simulation, the evolution characteristics of the composite pressure-arches in the near- and far-field were revealed. Results show that the stepped pressure-arch in broken blocks of the basic roof was formed when the horizontal principal stress was greater than the in-situ stress. The broken blocks’ sliding could induce roof cutting off and strong weighting load. The structural characteristics of the overlying strata were determined by the thickness of the bedrock. The upper broken rocks formed a symmetrical pressure-arch in the near- and a far-field pressure-arch formed in the mining field. The median periodic broken rocks formed the rotating-squeezed pressure-arch, bearing the load of the loose layers and protecting the mining panel. After all bedrocks breaking, the latter arch foot of the far-field pressure-arch was transferred to the compacted caving zone. This study can provide a theoretical reference for the similar mining engineering.
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Zhao, Yanhai, Shuren Wang, Paul Hagan, Lianwei Ren, and Zhengsheng Zou. "Pressure-Arching Characteristics in Roof Blocks during Shallow Coal Mining." Advances in Civil Engineering 2018 (September 16, 2018): 1–12. http://dx.doi.org/10.1155/2018/6817059.

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To reveal the performance of the stepped subsidence and the strong roof weighting during shallow coal mining, taking the fully mechanized mining face with large mining height in the Shendong mining area in China as the engineering background, theoretical analysis and numerical simulation were used to analyze the pressure-arching effect of the hanging roof blocks. Three typical pressure-arch models of the roof structure were proposed, such as the symmetrical pressure-arch of two key blocks, the step pressure-arch of multiple key blocks, and the rotative pressure-arch of multiple key blocks. Results indicate that the horizontal stress displays a nonlinear distribution at the abutments of the symmetrical pressure-arch, and there is a linear distribution of horizontal stress with a higher peak value at the midspan of the pressure-arch. The high horizontal stress at the arch abutment is necessary to form the rotative pressure-arch of multiple key blocks. The horizontal stress is relatively less at the arch abutment of the step pressure-arch structure. The main key block is easier to slide in this structure as the boundary horizontal stresses display the nonlinear distribution. The results are of instructive significance for roof weighting forecast and strata control during shallow horizontal mining for a thick coal seam.
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Li, Da Peng, Chuan An Cui, Cheng Hui Duan, and Jian Kui Zhao. "Theoretical Analysis on Pressure Arch Boundary around Circular Tunnel." Applied Mechanics and Materials 256-259 (December 2012): 1191–94. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1191.

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Pressure arch is a phenomenon of rock mass stress restructuring to display itself bearing capacity, one of the important aspects is determination of the pressure arch boundary, and now the main method to determine the pressure arch boundary is numerical analysis. In order to determine the pressure arch boundary theoretically, a circular tunnel is taken as analyzing model, and the secondary stress condition around the rock mass is analyzed, also the equations of horizontal stress and vertical stress are deduced, and then the variation regulation of horizontal stress and vertical stress are discussed. On this basis, 3 kinds of pressure arch boundary determination methods are researched, and the boundaries of each method are found out, finally, the differences of the methods are compared. The results show that every determination method of pressure arch boundary has its own rationality, and they can provide reference for engineering and new arch boundary determination method.
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SHIMIZU, Shingo, Chikara NAGAI, Eiichi GENDA, and Goro OBINATA. "Comparison of Plantar Pressure and Center of Pressure of the Normal Arch and Row Arch." Journal of Japan Society of Sports Industry 23, no. 2 (2013): 2_177–2_182. http://dx.doi.org/10.5997/sposun.23.2_177.

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Joubert-Huebner, E., A. Gerdes, and H.-H. Sievers. "An in vitro evaluation of a new cannula tip design compared with two clinically established cannula-tip designs regarding aortic arch vessel perfusion characteristics." Perfusion 15, no. 1 (January 2000): 69–76. http://dx.doi.org/10.1177/026765910001500110.

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We investigated in vitro aortic arch vessel perfusion characteristics of single and multiple jet-stream cannulae and a new dispersion stream tip aortic cannula. Pressures and flows of all arch vessels were measured while directing cannulae jets at the different arch vessels using 6 l/min pump flow. The highest increase in pressure above the set systemic level of 80 mmHg and increase in flow above the set normal flow distribution in the arch vessels occurred in the jet-streamed arch vessels with the single stream cannula. The values were as follows: 29 mmHg and 118 ml/min for the innominate artery, 28 mmHg and 42 ml/min for the left common carotid artery, and 25 mmHg and 54 ml/min for the left subclavian artery. The dispersion stream cannula showed increases in pressure and flow, followed by the multiple stream cannula. Aortic cannula tips and the orientation of jets are potential sources of imbalances of arch vessel perfusion with possible clinical implications regarding perfusion of arch vessels during extracorporeal circulation.
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Wang, Shuren, Xiaogang Wu, Yanhai Zhao, and Paul Hagan. "Mechanical Performances of Pressure Arch in Thick Bedrock during Shallow Coal Mining." Geofluids 2018 (October 1, 2018): 1–13. http://dx.doi.org/10.1155/2018/2419659.

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Due to the periodicity of mine pressure, it can easily lead to a wide-range damage of the overburden rock under shallow coal mining conditions, and the falling of the overburden rock is usually a serious threat to the mining safety. Based on the monitoring data of mine pressure in a typical shallow coal mine in northern China, the mechanical model of the surrounding rock in the mining field was built and the identification indicators of the pressure arch after coal mining was defined. Then, the arching mechanism, the stress distribution characteristics in different positions, and the bearing capacity of the pressure arch were analysed, and the evolution characteristics of the pressure arch under shallow horizontal coal mining were verified by numerical simulation and physical experiment. Results show that there is a core-bearing zone in the pressure arch, and the width of the core zone determines the bearing capacity of the pressure arch. The evolution of the pressure arch affects the formation and development of the caving arch of the loose zone in the mining field. The conclusions obtained in the study are of important theoretical value to direct the similar engineering practice.
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Pivirotto, Mia, Michael F. Swartz, Megan B. McGreevy, Nader Atallah-Yunes, Jill M. Cholette, Steven E. Lipshultz, and George M. Alfieris. "Factors Associated With an Abnormal Blood Pressure Response During Exercise After Coarctation Repair." World Journal for Pediatric and Congenital Heart Surgery 13, no. 1 (December 17, 2021): 53–59. http://dx.doi.org/10.1177/21501351211060351.

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Background Although resting blood pressures following aortic arch repair or the extended end-to-end anastomosis (EEA) repair for coarctation can be physiologic, factors associated with an abnormal blood pressure response after exercise are unknown. We measured blood pressure gradients following exercise in children who had undergone previous repair in accordance with a surgical selection algorithm and sought to identify factors associated with an abnormal blood pressure response. Methods In accordance with our practice's surgical algorithm for repair of coarctation, infants were stratified to aortic arch repair when the distal transverse arch-to-left carotid artery ratio (DTA:LCA) ≤ 1.0, or when a brachiocephalic trunk or intra-cardiac lesion requiring repair was present. A thoracotomy and EEA were otherwise used. A follow-up exercise stress test (EST) measured the arm:leg blood pressure gradient after exercise, and a gradient ≥ 20 mm Hg was defined as an abnormal blood pressure response. Results Thirty-seven infants who had previously undergone coarctation repair (aortic arch repair-19, EEA-18) completed an EST at 12.3 ± 2.2 years of age. Thirteen (35%) children (aortic arch repair-5, EEA-8; p = .3) exhibited an abnormal blood pressure response. Factors associated with an abnormal blood pressure response included: smaller DTA:LCA ratios prior to repair (1.0 ± .2 vs. 1.2 ± .3; p = .04) and greater body weight at the time of EST (57.5 ± 19.1 vs. 40.9 ± 15.6 kg; p = .03). Conclusion An abnormal blood pressure response following exercise is associated with smaller DTA:LCA ratios at the time of repair and increased weight during follow-up suggesting that patients with these factors warrant close observation.
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Tian, Chao, Yong Gang Li, and Zhi Xiong Zhang. "Arch with Various Wall Movements in Active Earth Pressure Abstract." Advanced Materials Research 1089 (January 2015): 286–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1089.286.

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For the retaining wall in translation, in this paper the writers present the minor principal stresses trajectory which named minor principal stress arches. By discussing the results of the various arch curves in arching effect with different displacements of retaining wall which include the arch curves in ultimate model of soil and the arch curves in none limit state of soil. It gets the soil arch curve change rule under different state of the displacements, different friction angles and different height: the arch curve turn gentle when the displacements increase.
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Yaremenko, Olena. "Сalculation methodology and determination of efforts in vault." Bulletin of Kharkov National Automobile and Highway University 2, no. 92 (May 10, 2021): 85. http://dx.doi.org/10.30977/bul.2219-5548.2021.92.2.85.

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Abstract. Problem. In this article we offer the meth-odology of calculation, based on the idea of dismem-berment of vault on the separate archs of single width. It is recommended for the estimation of efforts in the designed and damaged vaults. Also offered a methods of calculation effort in serried vaults. As spatial inflexibility of cross vault below than inflexi-bility of serried vault, then it is necessary to execute the calculation of the cheek arch abstracted from the tray of cross vault also. If the outline of tray is exe-cuted on a circular curve, then it is possible to take methodology of calculation of archs with the outline of axis a curve as catenoid. Goal. The proposed methodology for calculating closed and cross vaults is also based on the idea of dividing the arch into separate arches of unit width. The results of studies of efforts and rational forms of arches of V.A. Kiselev [1]. Methodology. Calculation based on the idea of dismemberment of vault on the separate archs of single width. Recommended for the estimation of efforts in the designed and damaged vaults. A method over of calculation of dome is brought for determina-tion of effort in serried vaults. Results. At the choice of outline of axis of arch it is necessary aspires to that an axis, on possibility, coincided with the curve of pressure. Such outline of axis is rational, as there are only central forces of N in an arch. Flexion mo-ments M and transversal forces of Q are equal to the zero. The coincidence of axis of arch with the curve of pressure can be got for the three-hinged arch. For the statically undetermined arch of complete coinci-dence of axis with the curve of pressure attaining is impossible, so that the origin of flexion moments at any her outline is inevitable. Originality. The tech-nique based on the separation of flat elements from the spatial structure does not show the reserves of strength of the structure. Experience of long-term operation of vaulted structures designed or verified by calculation using similar methods [2], [9] shows caution and reliability. Practical value. The tech-nique is also suitable for assessing the strength of damaged vaults with collapsed corners or walms.
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Dissertations / Theses on the topic "Pressure arch"

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Lee, Dong Gil. "Relationship between arch height and midfoot joint pressures during gait." Cleveland, Ohio : Cleveland State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1227563948.

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Thesis (D. Eng.)--Cleveland State University, 2008.
Abstract. Title from PDF t.p. (viewed on Feb. 2, 2009). Includes bibliographical references. Available online via the OhioLINK ETD Center. Also available in print.
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Housley, Jeffrey A. "Stability of transverse expansion in the mandibular dental arch." Oklahoma City : [s.n.], 2002. http://library.ouhsc.edu/epub/theses/Housley-Jeffrey-A.pdf.

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Figueiredo, Alexandre. "Relação entre a morfologia do arco plantar longitudinal medial e a pressão plantar em indivíduos saudáveis." Bachelor's thesis, [s.n.], 2019. http://hdl.handle.net/10284/8792.

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Projeto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciado em Fisioterapia
Objetivo: Comparar a pressão plantar e a velocidade do deslocamento do centro de pressão (CdP) entre pés normais, cavos e planos em indivíduos adultos saudáveis. Metodologia: foi realizado um estudo observacional, com 26 indivíduos saudáveis, classificados com pés normais (n=22), pés cavos (n=6) e pés planos (n=24) baseado no Foot Posture Index – 6. Os indivíduos caminharam normalmente ao longo de um espaço de 10 metros, enquanto usavam um sistema de análise de pressão plantar F-scan (Tekscan). Utilizaram-se 5 áreas que incluíram o retropé, médiopé, antepé, dedos e pé total. A pressão plantar máxima (PPmáx) e o integral pressão-tempo (IPT) e o centro de pressão (CdP) foram calculados para cada área. Resultados: não foram encontradas alterações significativas (p> 0,05) entre as variáveis PPmáx e o IPT com o arco plantar, no entanto foram encontradas alterações significativas para a velocidade do CdP com o arco plantar (p <0,05). Conclusão: este estudo confirma que o arco plantar longitudinal medial influencia algumas variáveis de pressão plantar, nomeadamente a velocidade do CdP.
Objective: To compare plantar pressure and the velocity of center of pressure (COP) displacement between normal, cavus and planus foot in healthy adult subjects. Methods: An observational study was performed with 26 healthy individuals classified as normal feet (n = 22), cavus feet (n = 6) and planus feet (n = 24) based in the Foot Posture Index - 6. Individuals walked normally over a 10 meters span, while using an F- scan (Tekscan) plantar pressure analysis system. Five areas were used that included the hindfoot, midfoot, forefoot, toes and total foot. The peak pressure (PP), integral pressure-time (PTI), center of pressure (COP) were calculated for each area. Results: no significant changes (p> 0.05) were found between the variables peak pressure (PP), total pressure-time integral (PTI) with the plantar arch, but significant changes were found for the velocity of center of pressure (COP) with the plantar arch (p <0.05). Conclusion: this study confirms that the medial longitudinal plantar arch influences some plantar pressure variables, namely the velocity of COP.
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Palhano, Rudnei. "Análise biomecânica do arco plantar longitudinal medial durante a fase de apoio na marcha." Universidade do Estado de Santa Catarina, 2008. http://tede.udesc.br/handle/handle/398.

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Made available in DSpace on 2016-12-06T17:07:16Z (GMT). No. of bitstreams: 1 RUDNEI PALHANO.pdf: 3683877 bytes, checksum: fe25b167aa6def43f3bead628f1850d4 (MD5) Previous issue date: 2008-04-25
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The aim of this correlational study was to analyze the plantar medial longitudinal arch during the stance phase of the gait. Thirty-two subjects of both genders (mean age 25,78±6,75 years) from Vale dos Sinos RS have participated of the research. The specific objectives was to describe the behavior of the plantar medial longitudinal arch during the gait in the initial contact and stance phase; identify the foot s angle with the surface in the initial contact; correlate the medial longitudinal plantar arch with the Ankle s angle during the contact phase; correlate the anthropometry variables with the dynamic behavior of the medial longitudinal plantar arch; correlate the plantar pressure distribution (peak pressure, plantar pressure mean, contact time and mean area) with the dynamic behavior of the kinetics and kinematics variables of the medial longitudinal plantar arch during the stance phase and relate the kinetics and kinematics variables with kinds of medial longitudinal plantar arch. The kinematics data has been acquired by the Spica Technology Corporation video system and for kinetic data was used the Novel Emed-XR system with a sampling rate of 100 Hz and the 3D Scanner INFOOT. Subjects were separate into three groups by the Cavanagh s arch index: Cavus foot; normal foot e planus foot. The variables analyzed were: medial longitudinal plantar arch angle in seated position, initial contact and stance phase, angle of the ankle in seated position and stance phase, plantar pressure of peak, mean plantar pressure, contact area, contact time and mean force. The Kolmogorov-Smirnov test has been applied for the statistical analysis to verify the normality of the data. The ANOVA One-Way test has been used to compare means intra-groups and to verify where were the differences was used the Scheffé`s Post Hoc test. Pearson test has been applied to verify the correlation. The level of significance adopted was p ≤ 0.05. There were no differences statistically significant when inter-groups kinematics and anthropometrics variables had been compared. Only in some regions of the plantar surface has shown differences statistically significant when the kinetics variables were compared inter-group. Analyzing the correlations between the dynamic arch index with kinematics variables, only the medial longitudinal plantar arch angle has shown a moderate correlation statistically significant, while others correlations had low relations.
O objetivo deste estudo correlacional foi analisar o Arco Plantar Longitudinal Medial durante a fase de apoio da Marcha. Com objetivos específicos: descrever o comportamento do Arco Plantar Longitudinal Medial durante a marcha nos períodos do Contato Inicial e Apoio Simples; Identificar o Ângulo do pé com a superfície no Contato Inicial; Correlacionar o Ângulo do Arco Plantar Longitudinal Medial com o Ângulo do Tornozelo durante a Fase de Contato; Correlacionar as variáveis antropométricas com o comportamento dinâmico do Arco Plantar Longitudinal Medial; Correlacionar as variáveis da Distribuição de Pressão Plantar (Pico de Pressão Plantar, Pressão Plantar Média, Tempo de contato e Área media) com o comportamento dinâmico das variáveis cinemáticas e cinéticas do Arco Plantar Longitudinal Medial durante a o apoio simples;Verificar diferenças nas variáveis cinemáticas e cinéticas relacionando com os diferentes tipos de Arco Plantar Longitudinal Medial dinamicamente. Participaram do estudo 32 sujeitos da região do Vale dos Sinos RS, ambos os sexos, idade entre 19 e 46 anos (25,78±6,75 anos). Utilizaram-se como instrumentos o Sistema de cinemetria da Spica Technology , Sistema cinético da Novel Emed e o Scanner 3D INFOOT. Os sujeitos foram classificados em três grupos através do Índice do Arco Plantar: Pés Cavos (PC); Pés Normais (PN) e Pés Planos (PP). As variáveis analisadas foram: Ângulo do Arco Plantar Longitudinal Média, na posição sentada, contato inicial e no apoio simples; Ângulo do Tornozelo, na posição sentada e apoio simples; Pico de Pressão Plantar; Pressão Plantar Média; Área de Contato; Tempo de Contato e Força Média. Na análise estatística foi aplicado o teste de Kolmogorov-Smirnov para verificar a normalidade nos dados. Na comparação das médias intra-grupos foi aplicado ANOVA One-Way e para verificar onde as diferenças encontravam foi utilizado o teste de Post hoc de Scheffé. Para verificar as correlações foi aplicado Pearson. O nível de significância adotado foi de p≤ 0,05. Na comparação inter-grupos para as variáveis cinemáticas e antropométricas, não apresentaram diferenças estatisticamente significativas. Apenas na comparação inter-grupos das variáveis cinéticas, em algumas regiões da superfície plantar apresentaram diferenças estatisticamente significativas. Ao analisar as correlações entre o Índice do Arco Plantar dinâmico com as variáveis cinemáticas, somente o ângulo do Arco Plantar longitudinal medial apresentou correlação moderada estatisticamente significativa, as demais variáveis cinemáticas apresentaram correlações baixas.
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Ramqvist, Anders, and Martin Länsman. "Computational fluid dynamics study of the spillway and plunge pool at Baihetan hydropower station : Numerical validation of the pressure distribution on the floor of an inverted-arch plunge pool." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-216968.

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Pokela, M. (Matti). "Predictors of brain injury after experimental hypothermic circulatory arrest:an experimental study using a chronic porcine model." Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:951427105X.

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Abstract There is a lack of reliable methods of evaluation of brain ischemic injury in patients undergoing cardiac surgery. The present study was, therefore, planned to evaluate whether serum S100β protein (I), brain cortical microdialysis (II), intracranial pressure (III) and electroencephalography (EEG) (IV) are predictive of postoperative death and brain ischemic injury in an experimental surviving porcine model of hypothermic circulatory arrest (HCA). One hundred and twenty eight (128) female, juvenile (8 to 10 weeks of age) pigs of native stock, weighing 21.0 to 38.2 kg, underwent cardio-pulmonary bypass prior to, and following, a 75-minute period of HCA at a brain temperature of 18°C. During the operation, hemodynamic, electrocardiograph and temperature monitoring was performed continuously. Furthermore, metabolic parameters were monitored at baseline, end of cooling, at intervals of two, four and eight hours after HCA and before extubation. Electroencephalographic recording was performed in all animals, serum S100β protein measurement in 18 animals, cortical microdialysis in 109 animals, and intracranial pressure monitoring in 58 animals. After the operation, assessment of behavior was made on a daily basis until death or elective sacrifice on the seventh postoperative day. All four studies showed that these parameters were predictive of postoperative outcome. Animals with severe histopathological injury had higher serum S100β protein levels at every time interval after HCA. Analysis of cortical brain microdialysis showed that the lactate/glucose ratio was significantly lower and the brain glucose concentration significantly higher among survivors during the early postoperative hours. Intracranial pressure increased significantly after 75 minutes of HCA, and this was associated with a significantly increased risk of postoperative death and brain infarction. A slower recovery of EEG burst percentage after HCA was significantly associated with the development of severe cerebral cortex, brain stem and cerebellum ischemic injury. In conclusion, serum S100β protein proved to be a reliable marker of brain ischemic injury as assessed on histopathological examination. Cerebral microdialysis is a useful method of cerebral monitoring during experimental HCA. Low brain glucose concentrations and high brain lactate/ glucose ratios after HCA are strong predictors of postoperative death. Increased intracranial pressure severely affected the postoperative outcome and may be a potential target for treatment. EEG burst percentage as a sum effect of anesthetic agent and ischemic brain damage is a useful tool for early prediction of severe brain damage after HCA. Among these monitoring methods, brain cortical microdialysis seems to be the most powerful one in predicting brain injury after experimental hypothermic circulatory arrest.
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Gaudric, Julien. "Morphométrie des anévrismes de l’aorte thoracique : de l’anatomie scanographique à la modélisation numérique." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS574.

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Rationnel : L’étude de l’anatomie de la crosse aortique a évolué pour optimiser le traitement des anévrismes par endoprothèse.Objectifs : I : caractériser les modifications morphométriques de la crosse induites par un anévrisme. II : évaluer la faisabilité des dispositifs endovasculaires actuels pour traiter les anévrismes de la crosse. III : créer un outil automatisé de mesure pour évaluer les angulations induites par ces déformations. IV : valider un modèle numérique de simulation 0D de la mécanique vasculaire en le confrontant à des données in vivo.Résultats : I : nous avons montré sur une étude scannographique que les anévrismes thoraciques s’accompagnaient d’un étirement bi directionnel de la paroi et d’une rotation de la crosse antérieure ou postérieure selon la localisation de l’anévrisme. II : parmi 56 malades opérés chirurgicalement d’anévrismes de la crosse, l’étude rétrospective de leur scanner montrait qu’aucun n’avait les critères anatomiques pour permettre une endoprothèse branchée. III : nous avons créé un logiciel de calcul automatisé des points de courbure maximale de l’aorte à partir d’une analyse continue du rayon de courbure de la ligne centrale. Sa pertinence a été validée par sa concordance avec la détermination visuelle des points. IV : nous avons confronté la déformation de l’onde de pression artérielle après clampage et déclampage de l’aorte chez 11 patients avec une bonne corrélation et accord entre un modèle numérique et des enregistrements continus intravasculaires. Conclusion : Les progrès dans l’analyse de la conformation de l’aorte et de la mécanique vasculaire sont nécessaires à l’adaptation de nouveaux substituts endovasculaires
Rational: Research on the anatomy of the aortic arch has been fueled by the need of a comprehensive analysis of this structure in the setting of endovascular repair. Aneurysmal disease causes distortions in areas where the implantation of stent grafts undergo major stress. Objectives: I: To characterize the morphometric modifications of the aortic arch induced by a thoracic aneurysm. II: To evaluate the feasibility of current endovascular devices in treating aortic arch aneurysms. III: To create an automated measurement tool for assessing the angulations induced by these deformations. IV: To validate a 0D numerical simulation model of vascular mechanics by comparing its predictions with in vivo data.Results: I: In a study of 78 CT scan, thoracic aneurysms were associated with bi-directional wall stretching and anterior or posterior rotation according to the aneurysm’s location. II: A retrospective study of the CT scans of 56 patients who underwent aortic arch aneurysm surgical repair showed that none of these patients had the anatomical criteria for a stent graft implantation. III: An automated software for calculating the aortic angulations from a continuous analysis of the curvature radius of the central line was developed and validated against the visual assessment of points. IV: Changes in the morphology of blood pressure waves after aortic clamping and unclamping were studied in 11 patients with a good correlation and agreement between the numerical model and continuous intravascular measurements. Conclusion: Advances in the analysis of aortic geometry and the simulation of vascular mechanics are necessary for the adaptation of new endovascular devices
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Reed, Lloyd Fisher. "An investigation of foot and ankle problems experienced by nurses." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/35779/1/Lloyd_Reed_Thesis.pdf.

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Relatively little information has been reported about foot and ankle problems experienced by nurses, despite anecdotal evidence which suggests they are common ailments. The purpose of this study was to improve knowledge about the prevalence of foot and ankle musculoskeletal disorders (MSDs) and to explore relationships between these MSDs and proposed risk factors. A review of the literature relating to work-related MSDs, MSDs in nursing, foot and lower-limb MSDs, screening for work-related MSDs, foot discomfort, footwear and the prevalence of foot problems in the community was undertaken. Based on the review, theoretical risk factors were proposed that pertained to the individual characteristics of the nurses, their work activity or their work environment. Three studies were then undertaken. A cross-sectional survey of 304 nurses, working in a large tertiary paediatric hospital, established the prevalence of foot and ankle MSDs. The survey collected information about self-reported risk factors of interest. The second study involved the clinical examination of a subgroup of 40 nurses, to examine changes in body discomfort, foot discomfort and postural sway over the course of a single work shift. Objective measurements of additional risk factors, such as individual foot posture (arch index) and the hardness of shoe midsoles, were performed. A final study was used to confirm the test-retest reliability of important aspects of the survey and key clinical measurements. Foot and ankle problems were the most common MSDs experienced by nurses in the preceding seven days (42.7% of nurses). They were the second most common MSDs to cause disability in the last 12 months (17.4% of nurses), and the third most common MSDs experienced by nurses in the last 12 months (54% of nurses). Substantial foot discomfort (Visual Analogue Scale (VAS) score of 50mm or more) was experienced by 48.5% of nurses at sometime in the last 12 months. Individual risk factors, such as obesity and the number of self-reported foot conditions (e.g., callouses, curled toes, flat feet) were strongly associated with the likelihood of experiencing foot problems in the last seven days or during the last 12 months. These risk factors showed consistent associations with disabling foot conditions and substantial foot discomfort. Some of these associations were dependent upon work-related risk factors, such as the location within the hospital and the average hours worked per week. Working in the intensive care unit was associated with higher odds of experiencing foot problems within the last seven days, foot problems in the last 12 months and foot problems that impaired activity in the last 12 months. Changes in foot discomfort experienced within a day, showed large individual variability. Fifteen of the forty nurses experienced moderate/substantial foot discomfort at the end of their shift (VAS 25+mm). Analysis of the association between risk factors and moderate/substantial foot discomfort revealed that foot discomfort was less likely for nurses who were older, had greater BMI or had lower foot arches, as indicated by higher arch index scores. The nurses’ postural sway decreased over the course of the work shift, suggesting improved body balance by the end of the day. These findings were unexpected. Further clinical studies examining individual nurses on several work shifts are needed to confirm these results, particularly due to the small sample size and the single measurement occasion. There are more than 280,000 nurses registered to practice in Australia. The nursing workforce is ageing and the prevalence of foot problems will increase. If the prevalence estimates from this study are extrapolated to the profession generally, more than 70,000 hospital nurses have experienced substantial foot discomfort and 25-30,000 hospital nurses have been limited in their activity due to foot problems during the last 12 months. Nurses with underlying foot conditions were more likely to report having foot problems at work. Strategies to prevent or manage foot conditions exist and they should be disseminated to nurses. Obesity is a significant risk factor for foot and ankle MSDs and these nurses may need particular assistance to manage foot problems. The risk of foot problems for particular groups of nurses, e.g. obese nurses, may vary depending upon the location within the hospital. Further research is needed to confirm the findings of this study. Similar studies should be conducted in other occupational groups that require workers to stand for prolonged periods.
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Markgren, Jakob. "CFD Modelling of Pressure-control Devices in Substations." Thesis, Umeå universitet, Institutionen för fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96455.

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Tait, Robert Niall. "Ignition of arc discharges at high pressures." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28523.

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This report describes attempts to discover a method for starting a water walled argon arc at high pressure. It is demonstrated that addition of small amounts of acetylene to the argon causes a very small reduction of breakdown voltage at pressures of about 3 atmospheres. Droplets of distilled water and of KC1 solution are shown to effectively increase the breakdown potential of a gas. A calculation of static fields before arc ignition is presented, and alternative starting circuit tests are done. Parallel starting pulse injection is found inferior to the normally used series injection. An auxiliary discharge is found to aid starting slightly, and a drastic decrease in the breakdown potential due to removal of the water wall is discovered.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Books on the topic "Pressure arch"

1

Jones, G. R. High pressure arcs in industrial devices: Diagnostic and monitoring techniques. Cambridge [England]: Cambridge University Press, 1988.

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Taschereau), Catholic Church Archdiocese of Quebec Archbishop (1870-1898 :. Circulaire au clergé: I. Communion [p]ascale pendant tout le carême; II. Pouvoir d'indulgencier les chapelets ... /[E.-A. arch. de Québec, i.e. Elzéar-Alexandre Taschereau]. [S.l: s.n., 1986.

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Catholic Church. Archdiocese of Quebec. Archbishop (1870-1898 : Taschereau). Circulaire au clergé: I. Compte rendu de la Société de colonisation du diocèse de Québec; II. Visite pastorale de 1882 / [E.-A. arch. de Québec, i.e. Elzéar-Alexandre Taschereau]. [S.l: s.n., 1986.

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M, Curran Francis, and United States. National Aeronautics and Space Administration., eds. Hollow cathodes in high pressure arc discharges. [Washington, DC]: National Aeronautics and Space Administration, 1985.

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Electrode erosion in arc discharges at atmospheric pressure. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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Woodson, Steven Wayne. An investigation of unipolar arcing at atmospheric pressure in Aluminum 2024 and aluminum coated glass slides. 1987.

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M, Curran Francis, and United States. National Aeronautics and Space Administration., eds. A low-erosion starting technique for high-performance arcjets. Washington, DC: National Aeronautics and Space Administration, 1994.

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M, Curran Francis, and United States. National Aeronautics and Space Administration., eds. A low-erosion starting technique for high-performance arcjets. Washington, DC: National Aeronautics and Space Administration, 1994.

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M, Curran Francis, and United States. National Aeronautics and Space Administration., eds. A low-erosion starting technique for high-performance arcjets. Washington, DC: National Aeronautics and Space Administration, 1994.

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M, Curran Francis, and United States. National Aeronautics and Space Administration., eds. A low-erosion starting technique for high-performance arcjets. Washington, DC: National Aeronautics and Space Administration, 1994.

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Book chapters on the topic "Pressure arch"

1

Vasava, P., Payman Jalali, and M. Dabagh. "Pulsatile Blood Flow Simulations in Aortic Arch: Effects of Blood Pressure and the Geometry of Arch on Wall Shear Stress." In IFMBE Proceedings, 1926–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89208-3_459.

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Vasava, P., P. Jalali, and M. Dabagh. "Computational Study of Pulstile Blood Flow in Aortic Arch: Effect of Blood Pressure." In IFMBE Proceedings, 1198–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03882-2_318.

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Imaizumi, K., Y. Iwakami, and K. Yamashita. "Effect of Exercise Intervention and Foot Load Changes on Foot Arch Evaluation Using Foot Pressure Distribution Data." In IFMBE Proceedings, 789–92. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02913-9_203.

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Cheng, Xiaohu. "An Arching Theory for Arch Tunnels Based on the Interaction Between the Lateral and Vertical Pressure in Good Ground." In Proceedings of GeoShanghai 2018 International Conference: Tunnelling and Underground Construction, 164–80. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0017-2_16.

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Wang, Wei, Hengwen Zhang, and Jiasheng Bian. "Research on the Opportunity of Construction Method Conversion in Upper-Soft and Lower-Hard Stratum Based on Pressure Arch Theory." In Engineering Challenges for Sustainable Underground Use, 8–16. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61636-0_2.

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Chok, C. L., and S. Joseph. "The Instantaneous Effects of Generic Foot Arch Support Insoles on Centre of Foot Pressure in Various Modes of Static Balance." In IFMBE Proceedings, 25–32. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3737-5_6.

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Kolikov, Victor, Alexander Bogomaz, and Alexander Budin. "Arc at Ultrahigh Pressure." In Powerful Pulsed Plasma Generators, 203–33. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95249-9_10.

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Wharmby, D. O. "High-Pressure Sodium (HPS) ARCS." In Radiative Processes in Discharge Plasmas, 327–45. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5305-8_13.

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Abid, Fahim, Kaveh Niayesh, and Nina Støa-Aanensen. "Arc Voltage Distribution Measurement in Tube Constricted Ultrahigh-Pressure Nitrogen Arc." In Lecture Notes in Electrical Engineering, 672–79. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31680-8_66.

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Karabourniotis, Dimitrios. "Excited State Diagnostics in High Pressure Arc Lamps." In Nonequilibrium Processes in Partially Ionized Gases, 677–83. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3780-9_57.

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Conference papers on the topic "Pressure arch"

1

Song, Yuxiang. "Calculation of Surrounding Rock Pressure Based on Pressure Arch Theory." In 2016 5th International Conference on Advanced Materials and Computer Science (ICAMCS 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icamcs-16.2016.59.

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Rostamy, Noorallah, David Sumner, Donald J. Bergstrom, and James D. Bugg. "Effect of Aspect Ratio on the Flow Field Above the Free End of a Finite Circular Cylinder." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28218.

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The flow above the free end of a surface-mounted finite-height circular cylinder was studied in a low-speed wind tunnel using particle image velocimetry (PIV). The cylinder was mounted vertically in the wind tunnel, normal to a ground plane. The approaching flow was in the x-direction and the cylinder axis was aligned in the z-direction. Velocity measurements were made above the free-end surface in several vertical (x-z) planes and several horizontal (x-y) planes, for finite circular cylinders of aspect ratios AR = 9, 7, 5 and 3, at a Reynolds number of Re = 4.2×104. The relative thickness of the boundary layer on the ground plane was δ/D = 1.7. In the vertical symmetry plane, the mean velocity measurements show the prominent separation from the circumferential leading edge, the mean recirculation zone above the free-end surface, the arch vortex inside the recirculation zone, and reattachment of the flow onto the free-end surface. Experimental evidence is found for a leading-edge separation bubble, a flow structure which has been reported in some numerical simulations in the literature. As AR decreases, the reattachment point and the centre of the arch vortex move downstream, the recirculation zone becomes thicker, and the centre of the arch vortex moves higher above the free end. Away from the symmetry plane, the recirculation zone becomes thinner, the arch vortex centre moves upstream and closer to the free-end surface, and the reattachment point moves upstream. In the horizontal planes, measurements made very close to the surface can approximate the mean surface streamline topology, revealing the pair of foci representing the termination points of the arch vortex, the prominent curved reattachment line, reverse flow beneath the mean recirculation zone, and the reattachment and separation saddle points on the free-end centerline.
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Zhu, Zhengguo, Minglei Sun, and Mingzhang Chen. "Calculation of Surrounding Rock Pressure on Multi-Arch Tunnel." In Second International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41039(345)164.

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Yi Jin-hua, Yuan Hang, and Yuan Xin. "Study and application of dislocation repair of arch rib of steel tubular arch bridge with negative pressure grouting." In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5987737.

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Hasan, Mohammad H., Fadi M. Alsaleem, and Hassen M. Ouakad. "A Novel Threshold Pressure Sensor Based on Nonlinear Dynamics of MEMS Arches." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67874.

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In this paper, we propose a new tunable pressure sensor based on the nonlinear snap-through instability of an electrically actuated shallow arch microbeam. The general concept of the sensor can be explained as follows: the shallow arch is excited to trigger dynamic snap-through instability yielding a high output amplitude, if the system operating pressure is below a threshold value. This state is interpreted as a digital logic 1. Once the varying pressure exceeds that threshold value, the arch gains its stability. Therefore, the new state would be interpreted as a digital logic 0 value. We show an example of an operation range of the proposed sensor by identifying the relationship between the excitation AC voltage and the critical cut-off pressure.
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Arii, Hiroaki, Nobuo Morita, Yoshiharu Ito, and Eri Takano. "Sand-Arch Strength Under Fluid Flow With and Without Capillary Pressure." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2005. http://dx.doi.org/10.2118/95812-ms.

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Alcheikh, Nouha, Amal Z. Hajjaj, and Mohammad I. Younis. "Wide Range Highly Sensitive Pressure Sensor Based on Heated Micromachined Arch Beam." 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/detc2019-97995.

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Abstract Miniaturized air-pressure sensing devices has received increasing attention during the past few decades. Pressure sensors have been explored in various potential applications, such as industrial control, healthcare, medical testing, and environmental monitoring [1–2]. Different sensing mechanisms and designs have been used for the detection of air-pressure. Of particular importance are resonant pressure sensors based on tracking the change in resonance frequency of the device with pressure. To improve the pressure sensor sensitivity, various designs have been investigated including carbon nanotubes, microcantilever, and bridge resonators. In a recent study [3], we showed a resonant pressure sensor based on an electrothermally heated clamped-clamped straight beam (cooling effect). We showed that operating the resonator near the buckling point maximizes its sensitivity [3]. In this work, we will focus on the detection of air pressure using an electrothermally heated initially curved beam exhibiting veering among its first two symmetric vibration modes, which offers more continuity in frequency variations, and hence measurements compared to buckled beams. The presented approach shows significant advantages in term of sensitivity and wide pressure range.
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Wang, Chengbing, and Hualao Wang. "Analysis on 3D the Dynamic Pressure Arch Effect around a Mountain Tunnel." In International Symposium on Systematic Approaches to Environmental Sustainability in Transportation. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479278.030.

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Imaizumi, K., Y. Iwakami, and K. Yamashita. "Analysis of foot pressure distribution data for the evaluation of foot arch type." In 2011 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2011. http://dx.doi.org/10.1109/iembs.2011.6091720.

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Guo, Li, and Xianglan Li. "Research on Arch Effect between Anti-slide Piles and Soil Pressure on Pile Sheet." In 2015 International Conference on Management, Education, Information and Control. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/meici-15.2015.163.

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Reports on the topic "Pressure arch"

1

Max Karasik. Driven Motion and Instability of an Atmospheric Pressure Arc. Office of Scientific and Technical Information (OSTI), December 1999. http://dx.doi.org/10.2172/15034.

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S. Daniel Day, Frank M.G. Wong, Steven R. Gordon, Lana L. Wong, and Raul B. Rebak. Electrochemical Testing of Gas Tungsten ARC Welded and Reduced Pressure Electron Beam Welded Alloy 22. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/893361.

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Lopez, Carlos, William Baker Wente, and Victor G. Figueroa. Evaluation of select heat and pressure measurement gauges for potential use in the NRC/OECD High Energy Arc Fault (HEAF) test program. Office of Scientific and Technical Information (OSTI), January 2014. http://dx.doi.org/10.2172/1204110.

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Capillary pressure testing of selected core samples from: ARCO Alaska Inc. Kavik Unit #3 (5325'-5440') well, and Exxon Corporation Canning River Unit Block A-1 well (4875'-4876' and 4882'-4883'). Alaska Division of Geological & Geophysical Surveys, 2002. http://dx.doi.org/10.14509/19151.

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