Relevant bibliographies by topics / Spring wall

Academic literature on the topic 'Spring wall'

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Published: 6 September 2023

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Journal articles on the topic "Spring wall"

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Si, Lin Jun, Gong Lian Chen, and Hua Li Wang. "Three-Spring Model for Spatial Walls." Applied Mechanics and Materials 238 (November 2012): 652–58. http://dx.doi.org/10.4028/www.scientific.net/amm.238.652.

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Shear wall structures, frame-shear wall structures and frame-tube wall structures are usually used in tall buildings, especially in China seismic regions. How to simulate the mechanical behaviors of these walls is the key to elastic-plastic analysis for tall buildings. Based on two-spring model, a nonlinear model for spatial walls is proposed. In this model, the axial, shear and flexural elastic-plastic deformation of the walls can be considered, the deformation compatibility between the wall and beam elements is also considered. The model was used to analysis the elastic-plastic behavior of spatial walls. Calculation example for verifying the model indicates that the result obtained by this method has the characteristics of fewer degrees of freedom and high accuracy. Therefore the nonlinear model for spatial walls provides a practical and efficient analysis method for tall buildings with complex type.
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Jeong, Seong-Hoon, and Won-Seok Jang. "Modeling of RC shear walls using shear spring and fiber elements for seismic performance assessment." Journal of Vibroengineering 18, no. 2 (March 31, 2016): 1052–59. http://dx.doi.org/10.21595/jve.2015.16757.

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Reinforced concrete shear wall is one of the most effective members during severe lateral loads especially in earthquakes and winds. Extensive researches, both analytical and experimental, have been carried out to study the behavior of reinforced concrete (RC) shear walls. Predicting inelastic response of RC walls and wall systems requires accurate, effective, and robust analytical model that incorporate important material characteristics and behavioral response features. In this study, a modeling method using fiber and spring elements is developed to capture inelastic responses of an RC shear wall. The fiber elements and the spring reflect flexural and shear behaviors of the shear wall, respectively. The fiber elements are built by inputting section data and material properties. The parameters of the shear spring that represent strength and stiffness degradation, pinching, and slip are determined based on analysis results from a detailed finite element method (FEM) model. The reliability of the FEM analysis program is verified. The applicability of the proposed modeling method is investigated by performing inelastic dynamic analyses for reference buildings with various aspect ratios of shear walls.
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Welty, Emily E. "Occupy Wall Street as “American Spring”?" Peace Review 26, no. 1 (January 2014): 38–45. http://dx.doi.org/10.1080/10402659.2014.876311.

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Mogilevich, L. I., V. S. Popov, A. A. Popova, and A. V. Khristoforova. "Mathematical Simulation of Nonlinear Vibrations of a Channel Wall Interacting with a Vibrating die Via Viscous Liquid Layer." Herald of the Bauman Moscow State Technical University. Series Instrument Engineering, no. 2 (139) (June 2022): 26–41. http://dx.doi.org/10.18698/0236-3933-2022-2-26-41.

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The article considers the developed mathematical model and investigates the dynamics of the interaction of a channel wall supported by a nonlinear spring with a vibrating opposite wall through a viscous fluid layer filling the channel. A flat slotted channel formed by two absolutely rigid rectangular walls, parallel to each other was investigated. One of the channel dimensions in the plan was much larger than the other, which leads to the transition to a plane problem. The bottom channel wall rested on a spring with a cubic nonlinear characteristic, and the upper wall was a die oscillating according to a given law. The gap between the walls was assumed to be much smaller than the channel longitudinal dimension, and the amplitudes of wall vibrations were much less than the channel gap. The movement of the viscous fluid in the channel was considered to be creeping. The mathematical model of the channel under consideration consisted of an equation of the dynamics of a single-mass system with a spring having a cubic nonlinearity, as well as the Navier --- Stokes and continuity equations, supple-mented by the boundary conditions for fluid nonslip on the channel walls and its free outflow at the ends. The steady-state nonlinear vibrations of the bottom channel wall at the fundamental frequency were studied, and its hydroelastic response was determined. The proposed model can be used to study nonlinear vibrations of elastically fixed elements that are in contact with liquid and are parts of modern devices and assemblies
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Kim, Euiyoung, and Haecheon Choi. "Space–time characteristics of a compliant wall in a turbulent channel flow." Journal of Fluid Mechanics 756 (September 1, 2014): 30–53. http://dx.doi.org/10.1017/jfm.2014.444.

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AbstractThe space–time characteristics of a compliant wall in a turbulent channel flow are investigated using direct numerical simulation (DNS). The compliant wall is modelled as a homogeneous plane supported by spring-and-damper arrays and is passively driven by wall-pressure fluctuations. The frequency/wavenumber spectra and convection velocities of the wall-pressure fluctuations, wall displacement and wall velocity are obtained from the present simulation. As the spring, damping, and tension coefficients decrease, the wall becomes softer and the wall displacement and velocity fluctuations increase. For a relatively stiff compliant wall (i.e. large spring, damping and streamwise tension coefficients), there are few changes in the skin-friction drag and near-wall turbulence structures. However, when a compliant wall is soft (i.e. small spring, damping and streamwise tension coefficients), the wall moves in the form of a large-amplitude quasi-two-dimensional wave travelling in the downstream direction. This wave is generated by the resonance of the wall property and the near-wall flow is significantly activated by this wall motion. The power spectra of wall variables show distinct peaks near the resonance frequencies. The convection velocities of the wall motion and wall-pressure fluctuations become smaller with a softer wall.
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Furukawa, Aiko, Junji Kiyono, and Kenzo Toki. "Proposal of a Numerical Simulation Method for Elastic, Failure and Collapse Behaviors of Structures and its Application to Seismic Response Analysis of Masonry Walls." Journal of Disaster Research 6, no. 1 (February 1, 2011): 51–69. http://dx.doi.org/10.20965/jdr.2011.p0051.

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We propose a dynamic analysismethod – a refined version of the DEM- that can simulate three-dimensional elastic, failure and collapse behaviors of structures. A structure is modeled as an assembly of rigid elements. Interaction between elements is modeled using multiple springs and multiple dashpots attached to surfaces of the elements. The elements are assumed to be rigid, but the method allows the simulation of structural deformation by permitting penetration between elements. There are two types of springs: one is a restoring spring to simulate elastic behavior before failure and the other is a contact spring for simulating contact and recontact between elements. A contact dashpot is also used to dissipate the energy of contact. Structural failure is modeled by replacing restoring springs with contact springs and dashpots. A method for determining spring constants is also proposed. The validity of the method is confirmed by the numerical simulation of masonry wall models. First, the elastic behavior induced by an impact force is calculated. It is found that the elastic behavior determined using the proposed method is in good agreement with that determined using the finite element method. Second, the seismic behaviors of masonry wall models with different laying patterns and a wall model with reinforcement are analyzed. It is found that the proposed method allows expression of the difference in behavior due to different laying patterns and reinforcement. The validity of the proposed method is thus confirmed. The proposed method is suitable for simulating seismic behavior of masonry structures.
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Shah, Kushal, Dmitry Turaev, Vassili Gelfreich, and Vered Rom-Kedar. "Equilibration of energy in slow–fast systems." Proceedings of the National Academy of Sciences 114, no. 49 (November 28, 2017): E10514—E10523. http://dx.doi.org/10.1073/pnas.1706341114.

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Ergodicity is a fundamental requirement for a dynamical system to reach a state of statistical equilibrium. However, in systems with several characteristic timescales, the ergodicity of the fast subsystem impedes the equilibration of the whole system because of the presence of an adiabatic invariant. In this paper, we show that violation of ergodicity in the fast dynamics can drive the whole system to equilibrium. To show this principle, we investigate the dynamics of springy billiards, which are mechanical systems composed of a small particle bouncing elastically in a bounded domain, where one of the boundary walls has finite mass and is attached to a linear spring. Numerical simulations show that the springy billiard systems approach equilibrium at an exponential rate. However, in the limit of vanishing particle-to-wall mass ratio, the equilibration rates remain strictly positive only when the fast particle dynamics reveal two or more ergodic components for a range of wall positions. For this case, we show that the slow dynamics of the moving wall can be modeled by a random process. Numerical simulations of the corresponding springy billiards and their random models show equilibration with similar positive rates.
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Wang, Zijun, Xingqiao Ma, Houbing Huang, Hongwen Xiao, and Tianfu Li. "Micromagnetic Simulation of Domain Walls in Exchange Spring Trilayers." Advances in Condensed Matter Physics 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/301063.

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Chiral domain wall structures in ferromagnetic exchange spring soft/hard/soft and hard/soft/hard trilayers were investigated with micromagnetic simulation, which enables us to fully characterize the nucleation and growth of buried domain walls in layered ferromagnetic thin films. Simulated results show that the trilayers are both exchange coupled and presenting chiral spin structures. Detailed features of field-dependent domain walls evolution in the spring magnets are also revealed. In process of remagnetization, the spin structure of soft/hard/soft is energetically more stable than that of hard/soft/hard.
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Fredso̸e, J., B. M. Sumer, J. Andersen, and E. A. Hansen. "Transverse Vibrations of a Cylinder Very Close to a Plane Wall." Journal of Offshore Mechanics and Arctic Engineering 109, no. 1 (February 1, 1987): 52–60. http://dx.doi.org/10.1115/1.3256990.

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The paper presents a series of experiments carried out with a cylinder suspended by springs and placed very close to a plane wall. The cylinder is exposed to a steady current. The range of gap ratios between zero and one has been studied in detail. Different combinations of spring stiffness and mass of cylinder is applied in the range of reduced velocity between 2 and 10. The proximity of the wall is shown to have important influence on the behavior of the pipe. Some of these trends are explained by a mathematical model including the effect of lift force close to the wall.
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Chaofeng, Li, Tang Qiansheng, Miao Boqing, and Wen Bangchun. "The sensibility on dynamic characteristics of pre-pressure thin-wall pipe under elastic boundary conditions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 6 (August 9, 2016): 995–1009. http://dx.doi.org/10.1177/0954406216631371.

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Consideration is given to dynamic behavior of cylindrical pressure pipe with elastic boundary conditions. Based on Sanders’ shell theory and Hamilton principle, the system equations are established for integrating the uniform distributed pressure into the elastic boundary condition. In the analytical formulation, the Rayleigh–Ritz method with a set of displacement shape functions is used to deduce mass, damping, and stiffness matrices of the pipe system. The displacements in three directions are represented by the characteristic orthogonal polynomial series and trigonometric functions which are satisfied with the elastic boundary conditions, which are represented as four sets of independent springs placed at the ends including three sets of linear springs and one set of rotational spring. The pressure pipe always suffers a uniform distributed pressure in radial direction. To verify the accuracy and reliability of the present method, several numerical examples with classical boundary condition, including free and simply supported supports are listed and comparisons are made with open literature. Then the influences of boundary restraint stiffness and the distributed pressure on natural frequency and the forced vibration response are studied: The natural frequencies increase significantly as the restraint stiffness or the distributed pressure increases. Compared to the rotational spring stiffness, the stiffnesses of axial, radial, and circumferential springs have more significant effect on natural frequency. And the lower modes are more sensitive on restraint stiffness than higher modes. But the variation of natural frequency with respect to the spring stiffness decreases monotonically with the increasing distributed pressure. The forced vibration response is also affected by the restraint stiffness.
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Dissertations / Theses on the topic "Spring wall"

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Sorensen, Taylor J. "Reducing Thermal Bridging and Understanding Second-Order Effects in Concrete Sandwich Wall Panels." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7642.

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Structural engineers have traditionally detailed structures with structural and fabrication efficiency in mind, but often based on a limited understanding of thermal efficiency. Some connection designs can create significant thermal bridging, leading to unnecessary heat transfer and even premature degradation through condensation. Thermal bridging occurs when heat transfer is given a path through a more conductive material like concrete or steel rather than insulation. Concrete sandwich wall panels (SWP) tend to be highly efficient at preventing heat transfer in the middle of panels, with greatest heat transfer occurring at connections. This project identified thermally efficient details for future SWP construction to reduce heat transfer, lessen environmental impact, and increase sustainability of SWP structures. It can be particularly difficult to avoid thermal bridging at corbel connections, so 12 corbel specimens were created and tested to provide alternative corbel design options for engineers. Nine details were successfully created and are presented. Corbel specimens were modeled using the Beam-Spring Method with good agreement. After validating the Beam-Spring Model, a parametric study investigated effectiveness of the PCI Second Order Analysis and the effect of length, panel stiffness, and wythe configuration on SWP behavior under axial and flexural loads.
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Slováková, Eliška. "Design prvků dětského hřiště." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228756.

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Main subject of this work is design of childrens playgroung elements. In this work there is also presented analysis of existent theme. I have designed a few variations, from which I chose the best solution. This solution I worked out in technical, aesthetic and ergonomical aspects. Designed elements match current requirements of safety standards.
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Yue, Guangyi. "Combinatorics of affine Springer fibers and combinatorial wall-crossing." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126939.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 149-152).
This thesis deals with several combinatorial problems in representation theory. The first part of the thesis studies the combinatorics of affine Springer fibers of type A. In particular, we give an explicit description of irreducible components of Fl[subscript tS] and calculate the relative positions between two components. We also study the lowest two-sided Kazhdan-Lusztig cell and establish a connection with the affine Springer fibers, which is compatible with the affine matrix ball construction algorithm. The results also prove a special case of Lusztig's conjecture. The work in this part include joint work with Pablo Boixeda. In the second part, we define the combinatorial wall-crossing transformation and the generalized column regularization on partitions and prove that a certain composition of these two transformations has the same effect on the one-row partition. This result gives a special situation where column regularization, can be used to understand the complicated Mullineux map, and also proves a special case of Bezrukavnikov's conjecture. Furthermore, we prove a condition under which the two maps are exactly the same, generalizing the work of Bessenrodt, Olsson and Xu. The combinatorial constructions is related to the Iwahori-Hecke algebra and the global crystal basis of the basic [ ... ]-module and we provide several conjectures regarding the q-decomposition numbers and generalizations of results due to Fayers. This part is a joint work with Panagiotis Dimakis and Allen Wang.
by Guangyi Yue.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Mathematics
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Francis, Elizabeth Jane. "An investigation into the validation of pedometers to detect foreleg steps in horses (Equus caballus) at walk and trot." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11304.

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Background: Current research, surrounding motor laterality at a population level in horses, indicates that in order to stand with the left forelimb in advance of the other, it is achieved by taking a greater amount of steps with the left foreleg than the right foreleg (McGreevy & Thomson 2006; McGreevy et al. 2007); suggesting that pedometers could effectively estimate asymmetry of forelimb locomotion in grazing horses. This novel method of detecting forelimb preference also reduces the likelihood of operator influence and provides an inexpensive objective measure of vertical movement which has the advantage of scoring large sample sizes, avoids single-day anomalies by recording over multiple days and overcomes logistical challenges (Vincent & Sidman 2003; Chan et al. 2005; Silva et al. 2010; Warren-Smith & McGreevy 2010). However in order to determine the reliability and validity of this novel measure the relationship between pedometer data and those derived from direct observation will first need to be assessed (Warren-Smith and McGreevy 2010). Objectives: To determine: (1) if pedometers accurately record equine steps at walk and trot, when compared to video analysis, (2) if alternative positioning of these pedometers affected the accuracy of step detection when compared to video analysis. Method: Five horses each wearing a Yamax Digiwalk SW-200 (spring lever arm pedometer) and a Yamax Power Walker PW-610/611 (piezoelectric pedometer) positioned on the left foreleg (LF), left scapular (LS), chest (C), right scapular (RS) and right foreleg (RF) walked and trotted on a 20m circle 10 times on each rein to yield 100 results for each gait. Video recorded by GoPro Hero 3 Black edition camera positioned on the girth facing the forefeet using the following settings: 180 degree field of view, 720p, 120fps. Both visual and audio data were captured and recorded. Results: Kruskal-Wallis Test on the deviation from actual number of steps per unit for each type of pedometer and the position of the pedometer compared to the actual number of steps taken by both forelegs determined that there is a significant difference (H1= 340.31; P < 0.0001) between readings in walk and also in trot (H1 = 483.49; P < 0.0001). A further Kruskal-Wallis Test on the deviation from actual number of steps per unit for each type of pedometer and the position of the pedometer compared to the actual number of steps taken by individual forelegs determined that there is a significant difference (H = 403.36; p < 0.0001) at walk and also at trot (H = 477.10; p < 0.0001). Conclusion: In summary, the analysis of the pedometer data compared to video analysis indicate that pedometers are not useful for scoring forelimb movements in horses at walk and trot, regardless of positioning.
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Springer, Matthias [Verfasser], and Stefan [Gutachter] Becker. "Fluid–Structure–Acoustics Interaction of Turbulent Wall–Bounded Flows / Matthias Springer ; Gutachter: Stefan Becker." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1153203278/34.

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Hashem, Ahmad. "Predicting spray drift dispersal over uniform canopy by heavy particle random-walk model." Thesis, Cranfield University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329091.

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Mackura, Mark. "Nano-confinement Effects of Crystalline Walls on the Glass Transition of a Model Polymer." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1366815752.

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El, Khissassi Abdelkader. "Les enjeux des relations Euro-Méditerranéennes entre la chute du mur de Berlin et les déboires du Printemps Arabe (1989-2013)." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAG023.

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Ce travail de recherche a pour objectif d’analyser les différentes initiatives de partenariat liant les pays méditerranéens avec l’UE, ainsi que l’élucidation des différents degrés d’engagement et d'implication de ces pays et sous-groupements régionaux dans ces initiatives. Il vise également à dévoiler les différents atouts et faiblesses qui caractérisent les relations Euro-méditerranéennes. La finalité de ce travail de recherche consiste à éclaircir les enjeux de ces relations et la justification de l’utilité de rapprochement entre les pays Sud-méditerranéens avec l’UE dans un espace géographique restreint et dans un cadre historique limité. Ainsi, cette analyse s’est focalisée sur les différents atouts politiques, économiques et sociaux ayant marqué les relations euro-méditerranéennes, durant la période allant de la Chute du Mur de Berlin (1989) jusqu'à l'échec du Printemps Arabe (2013). A l’issue de cette thèse, plusieurs alternatives et pistes de réflexion ont été suggérées, dans la perspective d’éviter les raisons d’échecs déjà constatées et afin de contribuer à l’édification de fondements solides susceptibles de concourir à la réussite des futurs partenariats et initiatives de coopérations euro-méditerranéennes
This thesis is attempting to analyze the various partnership initiatives between the Mediterranean countries and the EU, as well as the different degrees of commitment and involvement of these countries and sub-regional groupings in these initiatives.It also aims at revealing the different strengths and weaknesses that characterize the Euro-Mediterranean relations.The purpose of this research work is to analyze the issues of the Euromed relationships and the size of building links between the Mediterranean countries and the EU in geographically restricted space and during a limited historical period. This analysis has focused on the different political assets, economic and social issues which characterized the Euro-Mediterranean relationships, especially in the period from the fall of the Berlin Wall (1989) until the failure of the Arab Spring (2013). Following this work, several alternatives and ideas have been suggested, with a view to avoiding the failure of stakes already recognized.The objective is to contribute to analysis of creating new strong frameworks which may contribute to the success of the future partnerships and initiatives in relation to the euro- Mediterranean cooperation
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Krupp, Anna [Verfasser], and Otmar [Akademischer Betreuer] Spring. "Strategies and mechanisms of cellular interaction between the parasitic weed Orobanche cumana WALLR. and its host Helianthus annuus L. / Anna Clarissa Krupp ; Betreuer: Otmar Spring." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2020. http://d-nb.info/122210055X/34.

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Krupp, Anna Clarissa [Verfasser], and Otmar [Akademischer Betreuer] Spring. "Strategies and mechanisms of cellular interaction between the parasitic weed Orobanche cumana WALLR. and its host Helianthus annuus L. / Anna Clarissa Krupp ; Betreuer: Otmar Spring." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2020. http://d-nb.info/122210055X/34.

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Books on the topic "Spring wall"

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Stamper, Julian. High wall of spring. Santa Barbara: Fithian Press, 1986.

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High wall of spring. Santa Barbara, Calif: Fithian Press, 2001.

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From Cairo to Wall Street: Voices from the global spring. New York: New Press, 2012.

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Veech, Andrew Stoesser. Archeological investigations--Spring 2001 of the Green Spring "Orangery Wall", Colonial National Historical Park, James City County, Virginia. Yorktown, Va.]: Colonial National Historical Park, Dept. of the Interior, National Park Service, 2003.

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The American spring: What we talk about when we talk about revolution. New York: Skyhorse Pub., 2012.

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Chan, Judy. A walk through spring. Bangkok, Thailand: Woman Publisher, 2010.

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Stone spring. London: Gollancz, 2010.

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Richard, Long. Adamello walk: Eight days spring 2000. Milano: Skira, 2000.

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Stone spring. New York: Roc, 2011.

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Walk and see ABC. Somerville, Massachusetts: Candlewick Press, 2018.

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Book chapters on the topic "Spring wall"

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Bishop, Elizabeth. "“Dogs of Wall Street, Let Us Alone”: Graffiti in Cold War Baghdad, 1953." In The Arab Spring, Civil Society, and Innovative Activism, 17–32. New York: Palgrave Macmillan US, 2016. http://dx.doi.org/10.1057/978-1-137-57177-9_2.

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Mizuno, Yoshinori, and Javier Jiménez. "Wall turbulence without walls." In Springer Proceedings in Physics, 597–600. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03085-7_143.

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Nazarenko, Nelli N., and Anna G. Knyazeva. "Transfer of a Biological Fluid Through a Porous Wall of a Capillary." In Springer Tracts in Mechanical Engineering, 503–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_22.

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AbstractThe treatise proposes a model of biological fluid transfer in a dedicated macropore with microporous walls. The distribution of concentrations and velocity studies in the capillary wall for two flow regimes—convective and diffusive. The largest impact on the redistribution of concentration between the capillary volume and its porous wall is made by Darcy number and correlation of diffusion coefficients and concentration expansion. The velocity in the interface vicinity increases with rising pressure in the capillary volume or under decreasing porosity or without consideration of the concentration expansion.
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Cox, Simon C., Catriona D. Menzies, Rupert Sutherland, Paul H. Denys, Calum Chamberlain, and Damon A. H. Teagle. "Changes in hot spring temperature and hydrogeology of the Alpine Fault hanging wall, New Zealand, induced by distal South Island earthquakes." In Crustal Permeability, 228–48. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119166573.ch19.

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Bhoraniya, Rameshkumar, Gayathri Swaminathan, and Vinod Narayanan. "Wall Jet." In Springer Tracts in Mechanical Engineering, 205–21. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9574-3_8.

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Hubeny, Michael. "Plasma Wall Transition Dynamics." In Springer Theses, 9–21. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12536-3_2.

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Ngouani, M. M. Siewe, Yong Kang Chen, R. Day, and O. David-West. "Low-Speed Aerodynamic Analysis Using Four Different Turbulent Models of Solver of a Wind Turbine Shroud." In Springer Proceedings in Energy, 149–54. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_19.

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AbstractThis study presents the effect of four different turbulent models of solver on the aerodynamic analysis of a shroud at wind speed below 6 m/s. The converting shroud uses a combination of a cylindrical case and an inverted circular wing base which captures the wind from a 360° direction. The CFD models used are: the SST (Menter) k-ω model, the Reynolds Stress Transport (RST) model, the Improved Delay Detached Eddies Simulation model (IDDES) SST k-ω model and the Large Eddies Simulation Wall Adaptive model. It was found that all models have predicted a convergent surface pressure. The RST, the IDDES and the WALE LES are the only models which have well described regions of pressure gradient. They have all predicted a pressure difference between the planes (1–5) which shows a movement of the air from the lower plane 1 (inlet) to the higher plane 5 (outlet). The RST and IDDES have predicted better vorticities on the plane 1 (inlet). It was also found that the model RST, IDDES, and WALE LES have captured properly the area of turbulences across the internal region of the case. All models have predicted the point of flow separation. They have also revealed that the IDDES and the WALE LES can capture and model the wake eddies at different planes. Thus, they are the most appropriate for such simulation although demanding in computational power. The movement of air predicted by almost all models could be used to drive a turbine.
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Klewicki, Joseph, William Saric, Ivan Marusic, and John Eaton. "Wall-Bounded Flows." In Springer Handbook of Experimental Fluid Mechanics, 871–907. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-30299-5_12.

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Hwang, R., and L. W. Wong. "Evaluation of Performance of Walls in Deep Excavations Using Wall Deflection Paths." In Springer Series in Geomechanics and Geoengineering, 204–22. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6632-0_16.

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Bostenaru Dan, Maria. "Green Walls." In Springer Geography, 143–83. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8536-5_11.

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Conference papers on the topic "Spring wall"

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Costanzo, S., and G. Di Massa. "Localized Bessel Beams for Through-the-wall Communications." In 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring). IEEE, 2019. http://dx.doi.org/10.1109/piers-spring46901.2019.9017502.

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Incorvaia, G., and O. Dorn. "2D Through-the-wall Radar Imaging Using a Level Set Approach." In 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring). IEEE, 2019. http://dx.doi.org/10.1109/piers-spring46901.2019.9017297.

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Su, Wanhua, Rongwen Lin, Hui Xie, and Shao-xi Shi. "Enhancement of Near Wall Mixing of an Impinging Jet by Means of a Bump on the Wall." In International Spring Fuels & Lubricants Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/971616.

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De Leo, A., G. Cerri, P. Russo, and V. Mariani Primiani. "Calibration of a Reverberation Chamber for Radiated Emission Measurements by Wall Mounted Antennas." In 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring). IEEE, 2019. http://dx.doi.org/10.1109/piers-spring46901.2019.9017542.

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Ko, Kyungnam, and Masataka Arai. "Diesel Spray and Adhering Fuel on an Impingement Wall." In Spring Fuels & Lubricants Meeting & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-1628.

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Maia Beraldo, Matheus, Christian Bresci, Victor Barcelos Victorino, and Marcello Augusto Faraco de Medeiros. "Wall pressure fluctuations measurement during boundary layer transition." In 13th Spring School on Transition and Turbulence. ABCM, 2022. http://dx.doi.org/10.26678/abcm.eptt2022.ept22-0047.

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Amagai, Kenji, Yasuhiro Maruyama, Masahiro Saito, and Masataka Arai. "Spray-to-Spray Interactions after Wall Impingement." In 2003 JSAE/SAE International Spring Fuels and Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-1835.

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Ball, Douglas J., Russell Richmond, Charles Kirby, Glenn Tripp, and Burton Williamson. "UltraThin Wall Catalyst Solutions at Similar Restriction and Precious Metal Loading." In CEC/SAE Spring Fuels & Lubricants Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1844.

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Souza, Francisco, Bruno Silva de Lima, João Rodrigo Andrade, and Carlos Duarte. "ANALYSIS OF THE EFFECTS OF TURBULENCE CLOSURE MODELS ON WALL FILM MODELLING." In 12th Spring School on Transition and Turbulence. ABCM, 2020. http://dx.doi.org/10.26678/abcm.eptt2020.ept20-0041.

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S. Freire, Livia. "Large-Eddy Simulation of smooth channel flow with a stochastic wall model." In 12th Spring School on Transition and Turbulence. ABCM, 2020. http://dx.doi.org/10.26678/abcm.eptt2020.ept20-0010.

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Reports on the topic "Spring wall"

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Walshire, Lucas, Joseph Dunbar, and Benjamin Breland. Stability analysis of Old River Low Sill Structure. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45349.

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An updated stability analysis was performed on the Old River Low Sill Structure due to a change in the operating conditions from historic river sedimentation. Sedimentation of the Mississippi River channel since the 1973 spring flood has caused higher river stages at lower discharges. Numerical methods used included nonlinear analysis of pile group stability, seepage analyses, and limit equilibrium methods. The structure’s foundation was compromised during the 1973 flood, and emergency repairs were conducted to prevent scouring and undermining of the foundation by the flood scour. Rehabilitation included the reconstruction of a failed wing wall on the left abutment, rock and riprap fill in the forebay channel, and emergency grouting to fill the scour hole beneath the structure. An operating restriction was emplaced to limit the differential head across the structure due to flood damage. Taking these conditions into account, results from an updated analysis showed that full headwater uplift caused increased tension in the piles, while the increased body load caused increased compressive loads in the piles. Review of piezometric monitoring and the seepage analyses showed that full headwater uplift is unlikely, indicating the foundation grouting adequately sealed the scour hole beneath the structure. Analysis results exhibited lower magnitude compression and tension loads in the piles with design load cases compared to previous analyses. Recommendations from these analyses indicate that increased monitoring and additional investigation may support increasing the differential head limitation.
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Honegger, Wijewickreme, and Monroy. L52325 Assessment of Geosynthetic Fabrics to Reduce Soil Loads on Buried Pipelines - Phase I and II. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2011. http://dx.doi.org/10.55274/r0010398.

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High soil loads on buried pipelines can lead to unacceptably high pipeline strains developed in response to permanent ground displacement. Common causes of permanent ground displacement are related to slope instability as a result of heavy precipitation or ground subsidence. In addition, several permanent ground displacement hazards are related to earthquakes including surface fault displacement, triggered landslide movement, surface ground settlement related to liquefaction, and lateral spread displacement. Result: Four specific areas of investigation were completed: 1.Performed baseline tests in moist sand to confirm minimal difference in horizontal soil restraint between moist and dry sand. 2.Performed tests to gauge the variation in horizontal load reduction with separation between the pipe and an inclined trench wall lined with two layers of geotextile. 3.Performed tests in compacted 19 mm (0.75 in) minus sand and crushed limestone (referred to locally in British Columbia as road mulch) to attempt to provide larger difference between horizontal forces developed with and without lining a trench wall with geotextile. 4.Performed tests to attempt to confirm oblique horizontal-axial soil restraint behavior reported in small-scale tests and centrifuge tests. Benefit: Rather than undertake further physical testing to better understand how the presence of single or dual layers of geotextile fabric changes the mechanisms by which soil restraint develops for horizontal ground displacement, future efforts should focus on numerical simulation preferably using discrete element methods. Until full-scale test data are available to confirm consistent prediction of oblique horizontal-axial soil restraint, the practice of treating horizontal and axial soil springs independently in the analysis of buried pipeline response to ground displacement, as is the current practice, should be maintained.
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Geologic map and profiles of the north wall of the Snake River Canyon, Thousand Springs and Niagara quadrangles, Idaho. US Geological Survey, 1991. http://dx.doi.org/10.3133/i1947c.

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