Relevant bibliographies by topics / Structurs

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Structurs'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Structurs"

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KHODZITSKAYA, Valentyna. "Development of corporate structurs: genesis of scientific approaches." Fìnansi Ukraïni 2019, no. 278 (2019): 111–23. http://dx.doi.org/10.33763/finukr2019.01.111.

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Elzayady, Nagwa, and Eltahry Elghandour. "FRACTURE RESISTANCE OF COMPOSITE STRUCTURS FROM HEMP BIO-FIBERS." Journal of Advanced Engineering Trends 40, no. 2 (2021): 137–47. http://dx.doi.org/10.21608/jaet.2020.44308.1059.

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HASEGAWA, Iwao, and Taro ARIKAWA. "ACCURACY AND COSTS OF NUMERICAL SIMULATION FOR DESIGN OF MARITIME STRUCTURS." Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76, no. 2 (2020): I_115—I_120. http://dx.doi.org/10.2208/jscejoe.76.2_i_115.

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Hoying, D. A., C. S. Tan, Huu Duc Vo, and E. M. Greitzer. "Role of Blade Passage Flow Structurs in Axial Compressor Rotating Stall Inception." Journal of Turbomachinery 121, no. 4 (1999): 735–42. http://dx.doi.org/10.1115/1.2836727.

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The influence of three-dimensional flow structures within a compressor blade passage has been examined computationally to determine their role in rotating stall inception. The computations displayed a short length-scale (or spike) type of stall inception similar to that seen in experiments; to the authors’ knowledge this is the first time such a feature has been simulated. A central feature observed during the rotating stall inception was the tip clearance vortex moving forward of the blade row leading edge. Vortex kinematic arguments are used to provide a physical explanation of this motion as well as to motivate the conditions for its occurrence. The resulting criterion for this type of stall inception (the movement of the tip clearance vortex forward of the leading edge) depends upon local flow phenomena related to the tip clearance with the implication that for this and possibly other stall mechanisms the flow structure within the blade passages must be addressed to explain the stability of an axial compression system that exhibits such short length-scale disturbances.
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MAGAINO, Shinichi. "Damage of Structures in the Environment and Its Countermeasure. Damage of Outdoor Structurs Caused by Acid Rain." Journal of the Surface Finishing Society of Japan 46, no. 6 (1995): 477–80. http://dx.doi.org/10.4139/sfj.46.477.

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Subcommittee on Common Design Code. "General principles for the limit state design of steel and concrete structurs." Doboku Gakkai Ronbunshu, no. 450 (1992): 13–20. http://dx.doi.org/10.2208/jscej.1992.450_13.

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Yamasaki, Satoshi, and Kazuhiko Fukui. "2P266 Tertiary structure prediction of RNA-RNA complex structures using secondary structure information(22A. Bioinformatics: Structural genomics,Poster)." Seibutsu Butsuri 53, supplement1-2 (2013): S203. http://dx.doi.org/10.2142/biophys.53.s203_1.

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Matsumura, Hiroyuki, and Takamasa Ogata. "Quality Assurance in Welded Structurs I. A Conception of Quality Assurance and Safety Evaluation." Journal of the Japan Welding Society 62, no. 3 (1993): 120–25. http://dx.doi.org/10.2207/qjjws1943.62.120.

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Maniou, Theodora A. "From PSB to Privatisation." VIEW Journal of European Television History and Culture 6, no. 11 (2017): 102. http://dx.doi.org/10.18146/2213-0969.2017.jethc127.

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In Cyprus the historical evolution of television follows the country's turbulent political history, while clearly depicts the political system's vulnerabilities. This article presents a historical overview of the historical evolution of television in Cyprus, in accordance to the specific historical artefacts that generated a series of disadvantages still reflecting upon private broadcasting. The aim of the article is to present the interrelation between private broadcasting and politics and its current aftermath in Cyprus. Through a comparative analysis of different surveys, depicting the audience's points of view regrding private broadcasting and PSB, this study highlights the specific structurs and vulnerabilities of the current broadcasting sector.
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A-Ali Drea, Abbas, and Halla T. Mohammed. "Simulation Study of Adrenaline Synthesis from Phenylalanine." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 1 (2015): 3888–901. http://dx.doi.org/10.24297/jac.v12i1.843.

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Simulation study of Adrenaline synthesis from Phenylalanine has been carried out using semi-empirical methods (PM3) and density functional theory (DFT) STO-3G level of theory . Geometrical properties and vibration mods have been calculated for all structures. Different probable products have been suggested for each reaction and the most probable products being selected depending upon the electronic properties to prove the pathway of reactions that’s needed to synthesis adrenaline in the human body. The calculations show the most probable product than other structurs due its energetic values of total energy, energy barrier value, heat of formation, zero point energy, imaginary frequency and rate constant that’s equal to (5.554*1012, 5.572*1012, 7.857*1012, 1.331*1013,1.116*1013) respectively by s-1 units. Thermodynamic functions (∆H, ∆S, ∆G) have been calculated for five steps reactions of Adrenaline synthesis . In reaction 1 equal to (-69.468, 1.37*10-4, -66.610), reaction 2 (-46.453, 3.044*10-3, -64.710), reaction 3 (-63.734, 0.022, 138.900), reaction 4 (87.036, 8.631*10-3, -451.510) and reaction 5 (-6.722,-0.025, 346,800) respectively by kCal/mol, kCal/mol/deg, and kCal/mol respective units. The chemical reactivity or energy gap has been calculated for the most probable products in the pathway of adrenaline synthesis .
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Dissertations / Theses on the topic "Structurs"

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CHOFFLET, LUC. "Etude de l'optimisation des transducteurs ultrasonors et des structurs multi-piezoelectriques empilees." Paris 7, 1993. http://www.theses.fr/1993PA077138.

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Dans la premiere partie, la structure acoustique d'une sonde ultrasonore est optimisee en termes de sensibilite et de largeur de bande au moyen de simulations exploratoires. Le modele de transduction acoustique utilise permet de simuler le comportement unidimensionnel d'un materiau piezoelectrique equipe de lames d'adaptation avant et arriere et d'une semelle d'amortissement. Ce modele est etendu, dans la seconde partie de la these, aux sondes composees de deux materiaux piezo-electriques empiles. Deux nouvelles structures acoustiques permettant de gagner de la sensibilite et de la bande passante sont ainsi definies
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LINET, VIRGINIE. "Developpement d'une methode d'interferometrie holographique appliquee a l'analyse quantitative 3d du comportement dynamique de structurs." Paris 11, 1992. http://www.theses.fr/1992PA112253.

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Ces travaux concernent le developpement d'une methode de mesure optique basee sur l'interferometrie holographique pour analyser le comportement dynamique de structures. Le systeme developpe permet a la fois la mesure simultanee des trois composantes des deplacements de la structure et l'enregistrement ultra-rapide d'une serie d'interferogrammes generes par un laser a impulsions multiples. L'acquisition des deplacements tridimensionnels est basee sur l'enregistrement de trois interferogrammes ayant des faisceaux d'illumination non coplanaires, l'evaluation quantitative de chaque interferogramme s'appuyant sur la technique du decalage de phase. Nous avons mis au point une methode originale de multiplexage spatial des hologrammes qui permet de conserver exactement la meme vue de l'objet pour chacun des trois interferogrammes et donc d'attribuer sans ambiguite a chaque point analyse les trois mesures de phase. Les mesures effectuees sur un cylindre en vibration sont tres bien correlees avec les resultats obtenus par le calcul et confirment la grande sensibilite de la methode et sa fiabilite. Le systeme d'enregistrement ultra-rapide a ete developpe avec un laser a rubis delivrant quatre impulsions dans un intervalle de 800 s. La separation des enregistrements sur la plaque holographique est realisee par deviation des faisceaux de reference grace a des modulateurs acousto-optiques. Pour effectuer le traitement de ces donnees, nous avons examine theoriquement et experimentalement une methode de decomposition modale des reponses dynamiques mesurees par le systeme holographique. Les premiers resultats obtenus sont prometteurs et ouvrent de nouvelles perspectives d'application pour cette methode
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SCACCIATELLA, ERIC Berveiller Marcel. "INTEGRATION D'UN MODELE DE COMPORTEMENT ELASTOPLASTIQUE A TRANSITIONS D'ECHELLES DANS UN CODE DE CALCUL DE STRUCTURS PAR ELEMENTS FINIS /." [S.l.] : [s.n.], 1994. ftp://ftp.scd.univ-metz.fr/pub/Theses/1994/Scacciatella.Eric.SMZ9410.pdf.

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Peters, David W. "Design of diffractive optical elements through low-dimensional optimization." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/54614.

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The simulation of diffractive optical structures allows for the efficient testing of a large number of structures without having to actually fabricate these devices. Various forms of analysis of these structures have been done through computer programs in the past. However, programs that can actually design a structure to perform a given task are very limited in scope. Optimization of a structure can be a task that is very processor time intensive, particularly if the optimization space has many dimensions. This thesis describes the creation of a computer program that is able to find an optimal structure while maintaining a low-dimensional search space, thus greatly reducing the processor time required to find the solution. The program can design the optimal structure for a wide variety of planar optical devices that conform to the weakly-guiding approximation with an efficient code that incorporates the low-dimensional search space concept. This work is the first use of an electromagnetic field solver inside of an optimization loop for the design of an optimized diffractive-optic structure.
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Guy, Nicolas. "Modèle et commande structurés : application aux grandes structures spatiales flexibles." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0036/document.

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Dans cette thèse, les problématiques de la modélisation et du contrôle robuste de l’attitude des grandes structures spatiales flexibles sont considérées. Afin de satisfaire les performances de pointage requises dans les scénarios des futures missions spatiales, nous proposons d’optimiser directement une loi de commande d’ordre réduit sur un modèle de validation d’ordre élevé et des critères qui exploitent directement la structure du modèle. Ainsi, les travaux de cette thèse sont naturellement divisés en deux parties : une partie relative à l’obtention d’un modèle dynamique judicieusement structuré du véhicule spatial qui servira à l’étape de synthèse ; une seconde partie concernant l’obtention de la loi de commande.Ces travaux sont illustrés sur l’exemple académique du système masses-ressort, qui est la représentation la plus simple d’un système flexible à un degré de liberté. En complément, un cas d’étude sur un satellite géostationnaire est traité pour valider les approches sur un exemple plus réaliste d’une problématique industrielle<br>In this thesis, modeling and robust attitude control problems of large flexible space structures are considered. To meet the required pointing performance of future space missions scenarios, we propose to directly optimize a reduced order control law on high order model validation and criteria that directly exploit the model structure. Thus, the work of this thesis is naturally divided into two parts : one part on obtaining a wisely structured dynamic model of the spacecraft to be used in the synthesis step, a second part about getting the law control. This work is illustrated on the example of the academic spring-masses system, which is the simplest representation of a one degree of freedom flexible system. In addition, a geostationary satellite study case is processed to validate developed approaches on a more realistic example of an industrial problem
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Keyhani, Ali. "A Study On The Predictive Optimal Active Control Of Civil Engineering Structures." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/223.

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Uncertainty involved in the safe and comfort design of the structures is a major concern of civil engineers. Traditionally, the uncertainty has been overcome by utilizing various and relatively large safety factors for loads and structural properties. As a result in conventional design of for example tall buildings, the designed structural elements have unnecessary dimensions that sometimes are more than double of the ones needed to resist normal loads. On the other hand the requirements for strength and safety and comfort can be conflicting. Consequently, an alternative approach for design of the structures may be of great interest in design of safe and comfort structures that also offers economical advantages. Recently, there has been growing interest among the researchers in the concept of structural control as an alternative or complementary approach to the existing approaches of structural design. A few buildings have been designed and built based on this concept. The concept is to utilize a device for applying a force (known as control force) to encounter the effects of disturbing forces like earthquake force. However, the concept still has not found its rightful place among the practical engineers and more research is needed on the subject. One of the main problems in structural control is to find a proper algorithm for determining the optimum control force that should be applied to the structure. The investigation reported in this thesis is concerned with the application of active control to civil engineering structures. From the literature on control theory. (Particularly literature on the control of civil engineering structures) problems faced in application of control theory were identified and classified into two categories: 1) problems common to control of all dynamical systems, and 2) problems which are specially important in control of civil engineering structures. It was concluded that while many control algorithms are suitable for control of dynamical systems, considering the special problems in controlling civil structures and considering the unique future of structural control, many otherwise useful control algorithms face practical problems in application to civil structures. Consequently a set of criteria were set for judging the suitability of the control algorithms for use in control of civil engineering structures. Various types of existing control algorithms were investigated and finally it was concluded that predictive optimal control algorithms possess good characteristics for purpose of control of civil engineering structures. Among predictive control algorithms, those that use ARMA stochastic models for predicting the ground acceleration are better fitted to the structural control environment because all the past measured excitation is used to estimate the trends of the excitation for making qualified guesses about its coming values. However, existing ARMA based predictive algorithms are devised specially for earthquake and require on-line measurement of the external disturbing load which is not possible for dynamic loads like wind or blast. So, the algorithms are not suitable for tall buildings that experience both earthquake and wind loads during their life. Consequently, it was decided to establish a new closed loop predictive optimal control based on ARMA models as the first phase of the study. In this phase it was initially established that ARMA models are capable of predicting response of a linear SDOF system to the earthquake excitation a few steps ahead. The results of the predictions encouraged a search for finding a new closed loop optimal predictive control algorithm for linear SDOF structures based on prediction of the response by ARMA models. The second part of phase I, was devoted to developing and testing the proposed algorithm The new developed algorithm is different from other ARMA based optimal controls since it uses ARMA models for prediction of the structure response while existing algorithms predict the input excitation. Modeling the structure response as an AR or ARMA stochastic process is an effective mean for prediction of the structure response while avoiding measurement of the input excitation. ARMA models used in the algorithm enables it to avoid or reduce the time delay effect by predicting the structure response a few steps ahead. Being a closed loop control, the algorithm is suitable for all structural control conditions and can be used in a single control mechanism for vibration control of tall buildings against wind, earthquake or other random dynamic loads. Consequently the standby time is less than that for existing ARMA based algorithms devised only for earthquakes. This makes the control mechanism more reliable. The proposed algorithm utilizes and combines two different mathematical models. First model is an ARMA model representing the environment and the structure as a single system subjected to the unknown random excitation and the second model is a linear SDOF system which represents the structure subjected to a known past history of the applied control force only. The principle of superposition is then used to combine the results of these two models to predict the total response of the structure as a function of the control force. By using the predicted responses, the minimization of the performance index with respect to the control force is carried out for finding the optimal control force. As phase II, the proposed predictive control algorithm was extended to structures that are more complicated than linear SDOF structures. Initially, the algorithm was extended to linear MDOF structures. Although, the development of the algorithm for MDOF structures was relatively straightforward, during testing of the algorithm, it was found that prediction of the response by ARMA models can not be done as was done for SDOF case. In the SDOF case each of the two components of the state vector (i.e. displacement and velocity) was treated separately as an ARMA stochastic process. However, applying the same approach to each component of the state vector of a MDOF structure did not yield satisfactory results in prediction of the response. Considering the whole state vector as a multi-variable ARMA stochastic vector process yielded the desired results in predicting the response a few steps ahead. In the second part of this phase, the algorithm was extended to non-linear MDOF structures. Since the algorithm had been developed based on the principle of superposition, it was not possible to directly extend the algorithm to non-linear systems. Instead, some generalized response was defined. Then credibility of the ARMA models in predicting the generalized response was verified. Based on this credibility, the algorithm was extended for non-linear MDOF structures. Also in phase II, the stability of a controlled MDOF structure was proved. Both internal and external stability of the system were described and verified. In phase III, some problems of special interest, i.e. soil-structure interaction and control time delay, were investigated and compensated for in the framework of the developed predictive optimal control. In first part of phase III soil-structure interaction was studied. The half-space solution of the SSI effect leads to a frequency dependent representation of the structure-footing system, which is not fit for control purpose. Consequently an equivalent frequency independent system was proposed and defined as a system whose frequency response is equal to the original structure -footing system in the mean squares sense. This equivalent frequency independent system then was used in the control algorithm. In the second part of this phase, an analytical approach was used to tackle the time delay phenomenon in the context of the predictive algorithm described in previous chapters. A generalized performance index was defined considering time delay. Minimization of the generalized performance index resulted into a modified version of the algorithm in which time delay is compensated explicitly. Unlike the time delay compensation technique used in the previous phases of this investigation, which restricts time delay to be an integer multiplier of the sampling period, the modified algorithm allows time delay to be any non-negative number. However, the two approaches produce the same results if time delay is an integer multiplier of the sampling period. For evaluating the proposed algorithm and comparing it with other algorithms, several numerical simulations were carried during the research by using MATLAB and its toolboxes. A few interesting results of these simulations are enumerated below: ARM A models are able to predict the response of both linear and non-linear structures to random inputs such as earthquakes. The proposed predictive optimal control based on ARMA models has produced better results in the context of reducing velocity, displacement, total energy and operational cost compared to classic optimal control. Proposed active control algorithm is very effective in increasing safety and comfort. Its performance is not affected much by errors in the estimation of system parameters (e.g. damping). The effect of soil-structure interaction on the response to control force is considerable. Ignoring SSI will cause a significant change in the magnitude of the frequency response and a shift in the frequencies of the maximum response (resonant frequencies). Compensating the time delay effect by the modified version of the proposed algorithm will improve the performance of the control system in achieving the control goal and reduction of the structural response.
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Sibai, Munira. "Optimization of an Unfurlable Space Structure." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99908.

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Deployable structures serve a large number of space missions. They are vital since spacecraft are launched by placing them inside launch vehicle payload fairings of limited volume. Traditional spacecraft design often involves large components. These components could have power, communication, or optics applications and include booms, masts, antennas, and solar arrays. Different stowing methods are used in order to reduce the overall size of a spacecraft. Some examples of stowing methods include simple articulating, more complex origami inspired folding, telescoping, and rolling or wrapping. Wrapping of a flexible component could reduce the weight by eliminating joints and other components needed to enable some of the other mechanisms. It also is one of the most effective methods at reducing the compaction volume of the stowed deployable. In this study, a generic unfurlable structure is optimized for maximum natural frequency at its fully deployed configuration and minimal strain energy in its stowed configuration. The optimized stowed structure is then deployed in simulation. The structure consists of a rectangular panel that tightly wraps around a central cylindrical hub for release in space. It is desired to minimize elastic energy in the fully wrapped panel and hinge to ensure minimum reaction load into the spacecraft as it deploys in space, since that elastic energy stored at the stowed position transforms into kinetic energy when the panel is released and induces a moment in the connected spacecraft. It is also desired to maximize the fundamental frequency of the released panel as a surrogate for the panel having sufficient stiffness. Deployment dynamic analysis of the finite element model was run to ensure satisfactory optimization formulation and results.<br>Master of Science<br>Spacecraft, or artificial satellites, do not fly from earth to space on their own. They are launched into their orbits by placing them inside launch vehicles, also known as carrier rockets. Some parts or components of spacecraft are large and cannot fit in their designated space inside launch vehicles without being stowed into smaller volumes first. Examples of large components on spacecraft include solar arrays, which provide power to the spacecraft, and antennas, which are used on satellite for communication purposes. Many methods have been developed to stow such large components. Many of these methods involve folding about joints or hinges, whether it is done in a simple manner or by more complex designs. Moreover, components that are flexible enough could be rolled or wrapped before they are placed in launch vehicles. This method reduces the mass which the launch vehicle needs to carry, since added mass of joints is eliminated. Low mass is always desirable in space applications. Furthermore, wrapping is very effective at minimizing the volume of a component. These structures store energy inside them as they are wrapped due to the stiffness of their materials. This behavior is identical to that observed in a deformed spring. When the structures are released in space, that energy is released, and thus, they deploy and try to return to their original form. This is due to inertia, where the stored strain energy turns into kinetic energy as the structure deploys. The physical analysis of these structures, which enables their design, is complex and requires computational solutions and numerical modeling. The best design for a given problem can be found through numerical optimization. Numerical optimization uses mathematical approximations and computer programming to give the values of design parameters that would result in the best design based on specified criterion and goals. In this thesis, numerical optimization was conducted for a simple unfurlable structure. The structure consists of a thin rectangular panel that wraps tightly around a central cylinder. The cylinder and panel are connected with a hinge that is a rotational spring with some stiffness. The optimization was solved to obtain the best values for the stiffness of the hinge, the thickness of the panel, which is allowed to vary along its length, and the stiffness or elasticity of the panel's material. The goals or objective of the optimization was to ensure that the deployed panel meets stiffness requirement specified for similar space components. Those requirements are set to make certain that the spacecraft can be controlled from earth even with its large component deployed. Additionally, the second goal of the optimization was to guarantee that the unfurling panel does not have very high energy stored while it's wrapped, so that it would not cause large motion the connected spacecraft in the zero gravity environments of space. A computer simulation was run with the resulting hinge stiffness and panel elasticity and thickness values with the cylinder and four panels connected to a structure representing a spacecraft. The simulation results and deployment animation were assessed to confirm that desired results were achieved.
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Chantrait, Teddy. "Approche multiéchelle en espace et en temps pour la prévision des endommagements dans les structures composites soumises à un impact de faible énergie." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0129/document.

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Les stratifiés composites sont de plus en plus utilisés dans les pièces de structures des aéronefs ce qui fait émerger de nouvelles problématiques comme celle des Impacts de Faible Energie (IFE). En effet, bien qu’ils possèdent des propriétés rapportées à leur masse très intéressantes ces matériaux peuvent être vulnérables aux petits chocs. Or, compte tenu des nombreux paramètres influents lors d’un tel impact (énergie, vitesse, stratification...), les essais actuellement majoritairement privilégiés à l’échelle industrielle sont long et coûteux. Ainsi, l’apport de la simulation numérique pourrait être d’une grande aide pour les constructeurs. La pratique du « virtual testing », en particulier, permettrait d’aller dans cette direction ce qui aurait pour effet de rationaliser les campagnes d’essais et les coûts financier qui en découlent. Cependant, elle peine à être mise en place ici car le temps CPU nécessaire pour la simulation fine des ndommagements induits par les IFE est trop important avec les méthodes actuelles. Partant de ce constat, ce travail a consisté à tirer avantageusement partie de la localisation spatiale et temporelle des délaminages, fissurations matricielles et ruptures de fibres qui peuvent apparaître pendant l’impact pour diminuer le coût de calcul. Ainsi une méthode multiéchelle en espace et en temps a été mise en place. Elle consiste à découper la structure impactée en deux zones. L’une est située autour du point d’impact, elle contient l’ensemble des non-régularités du problème (contact, loi adoucissante, modèle de zone cohésive). Elle est traitée avec le code de dynamique explicite Europlexus. L’autre correspond à la partie complémentaire. Le problème mécanique y est beaucoup plus régulier et il est traité avec le code de dynamique implicite Zset/Zébulon. Un couplage peu intrusif basé sur la méthode GC est donc réalisé entre ces deux codes. Il permet d’utiliser une modélisation adaptée dans chacune des deux régions ce qui permet en particulier d’utiliser des pas de temps différents. Un rapport supérieur à 1000 peut ainsi être obtenu entre celui du code explicite fixé par la condition de stabilité et celui utilisé dans la partie complémentaire. Un gain de temps CPU significatif confirmé par la simulation d’un impact réalisé sur un panneau composite raidi est ainsi obtenu. Il est également montré que la répartition implicite/explicite peut évoluer au cours du calcul. Pour cela un mécanisme de bascule a été mis en place. Il permet ainsi de faire transiter la résolution d’une partie de la structure initialement traitée dans le code Zebulon dans Europlexus. Un gain de temps supplémentaire est alors obtenu grâce à cette méthode sur le même cas d’application<br>The composite laminates are increasingly used in aircraft structural parts which lead to new issues such as the Low Energy Impacts (LEI). Indeed, although they have well mechanical properties relative to their mass, small shocks may be very harmfull for laminates. Controlling such situations is essential for manufacturers that why lot of testing campaigns are currently performed. Yet, they are time consuming and expensive considering the many influential parameters (energy, speed, layup...). Numerical simulations of this phenomenon by practicing the so called “virtual testing” process could be really helpfull to rationalize testing campaigns in order to save money. Yet, this practice remain currently hard to do at the industrial scale due to the excessive CPU time required for fine simulation of damages induced by the LEI. Based on this observation, this work has consisted in taking advantage of the spatial and temporal location of delamination, matrix cracking and fiber breakage that can occur during impact in order to reduce the computational cost. Thus, a space and time multiscale method has been put in place. The impacted structure is split into two areas. One is located around the impacted point, it contains all the non-regularities of the problem (contact, softening law, cohesive zone model). This domain is treated with the explicit dynamics code Europlexus. The other one corresponds to the complementary part. The mechanical problem is much more regular and it is treated with the implicit dynamics code Zset / Zebulon. A low intrusive coupling based on the GC method is carried out between these two codes. It allows to use an adapted model in both regions different time step are in particular used. A time step ratio upper to 1000 can be reach between the one of the explicit code set by the stability condition and the one used in the complementary part. As a results, significant CPU time is saved. This is confirmed by the simulation of a stiffened composite panel impacted. It is also shown that the implicit / explicit allocation can change over the calculation. To do that, a switch mechanism has been established. It thus makes it possible to transit the resolution of a portion of the structure initially solved in the code Zebulon to Europlexus. As a results, further gain is obtained
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Plessas, Spyridon D. "Fluid-structure interaction in composite structures." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/41432.

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Approved for public release; distribution is unlimited.<br>In this research, dynamic characteristics of polymer composite beam and plate structures were studied when the structures were in contact with water. The effect of fluid-structure interaction (FSI) on natural frequencies, mode shapes, and dynamic responses was examined for polymer composite structures using multiphysics-based computational techniques. Composite structures were modeled using the finite element method. The fluid was modeled as an acoustic medium using the cellular automata technique. Both techniques were coupled so that both fluid and structure could interact bi-directionally. In order to make the coupling easier, the beam and plate finite elements have only displacement degrees of freedom but no rotational degrees of freedom. The fast Fourier transform (FFT) technique was applied to the transient responses of the composite structures with and without FSI, respectively, so that the effect of FSI can be examined by comparing the two results. The study showed that the effect of FSI is significant on dynamic properties of polymer composite structures. Some previous experimental observations were confirmed using the results from the computer simulations, which also enhanced understanding the effect of FSI on dynamic responses of composite structures.
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Lee, Seung-Yoon. "Geometrically exact modeling and nonlinear mechanics of highly flexible structures /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3074421.

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Books on the topic "Structurs"

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Sabbioneta: Cryptic city. Bibliotheque McLean, 2011.

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Computer analysis of structures: Matrix structural analysis structured programming. Elsevier, 1985.

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Baerlocher, C., J. M. Bennett, W. Depmeier, et al., eds. Structures and Structure Determination. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-69749-7.

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Kwon, Young W. Fluid-Structure Interaction of Composite Structures. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57638-7.

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International Conference on Soil Dynamics and Earthquake Engineering (4th 1989 Mexico City, Mexico). Structural dynamics and soil-structure interaction. Edited by Cakmak A. S. 1934- and Herrera Ismael. Computational Mechanics, 1989.

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Structural realism: Structure, object, and causality. Springer, 2012.

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M, Silva Lucas F., Castro, Paulo M.S.T., and SpringerLink (Online service), eds. Structural Connections for Lightweight Metallic Structures. Springer Berlin Heidelberg, 2012.

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Moore, Fuller. Understanding structures = Introduction to structural systems. McGraw Hill, 2000.

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Moreira, Pedro M. G. P., Lucas F. M. da Silva, and Paulo M. S. T. de Castro, eds. Structural Connections for Lightweight Metallic Structures. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-18187-0.

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Chamis, C. C. Computational structural mechanics for engine structures. National Aeronautics and Space Administration, 1989.

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Book chapters on the topic "Structurs"

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Kahle, Reinhard. "Structure and Structures." In Boston Studies in the Philosophy and History of Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93342-9_7.

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Chorostecki, Uciel, Jesse R. Willis, Ester Saus, and Toni Gabaldon. "Profiling of RNA Structure at Single-Nucleotide Resolution Using nextPARS." In Methods in Molecular Biology. Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1307-8_4.

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AbstractRNA molecules play important roles in almost every cellular process, and their functions are mediated by their sequence and structure. Determining the secondary structure of RNAs is central to understanding RNA function and evolution. RNA structure probing techniques coupled to high-throughput sequencing allow determining structural features of RNA molecules at transcriptome-wide scales. Our group recently developed a novel Illumina-based implementation of in vitro parallel probing of RNA structures called nextPARS.Here, we describe a protocol for the computation of the nextPARS scores and their use to obtain the structural profile (single- or double-stranded state) of an RNA sequence at single-nucleotide resolution.
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Stimpfle, Bernd. "Structural Air — Pneumatic Structures." In Textile Composites and Inflatable Structures II. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6856-0_13.

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Bates, Frederick L. "Structure and Structural Analysis." In Sociopolitical Ecology. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-0251-1_3.

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Martin, Philippe, and Laurence Alpay. "Conceptual structures and structured documents." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-61534-2_9.

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Peou, Sorpong. "Institutional Structure and Structural Challenges." In International Democracy Assistance for Peacebuilding. Palgrave Macmillan UK, 2007. http://dx.doi.org/10.1057/9780230590809_3.

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Tonkinwise, Cameron. "The Structure of Structural Change." In Routledge Handbook of Sustainable Design. Routledge, 2017. http://dx.doi.org/10.4324/9781315625508-37.

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Pedersen, P. Terndrup, and N.-J. Rishøj Nielsen. "Structural Optimization of Ship Structures." In Computer Aided Optimal Design: Structural and Mechanical Systems. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-83051-8_27.

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Suryanarayana, C., and M. Grant Norton. "Crystal Structure Determination. I: Cubic Structures." In X-Ray Diffraction. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-0148-4_4.

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Suryanarayana, C., and M. Grant Norton. "Crystal Structure Determination. II: Hexagonal Structures." In X-Ray Diffraction. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-0148-4_5.

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Conference papers on the topic "Structurs"

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Tkeshelashvili, Nino, Giorgi Kajaia, and Kakhaber Tavzarashvili. "MBPE for speeding up the computation of plasmonic structurs." In 2016 IEEE International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE, 2016. http://dx.doi.org/10.1109/mmet.2016.7544114.

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Yang, Kai-Shing, Tzu-Feng Chao, Ing Youn Chen, and Chi-Chuan Wang. "Experimental Studies of Nozzle/Diffuser Micropumps Using Enhancement Structure." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30588.

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This study conducts an experimental study concerning the improvement of nozzle/diffuser micropump design subject to enhanced structures. A total of three micropumps, including two enhancement structurs having two-fin or obstacle structure and one conventional micro nozzle/diffuser design. It is found that the pressure drops across the designed micro nozzles/diffusers are increased considerably when the obstacle or fin structure are added. The resultant maximum flow rates are 42.08 mm3/s and 50.15 mm3/s for conventional micro nozzle/diffuser and added two-fin structure in micro nozzle/diffuser operated at a frequency of 350 Hz. It is found that the mass flowrate for two-fin design surpasses that of conventional one when the frequency is below 400 Hz but the trend is reversed with a further increase of frequency. This is because the maximum efficiency ratio improvement for added two-fin is appreciably higher than the other design at a lower operating frequency. In the meantime, despite the efficiency ratio of the obstacle structure also reveals a similar trend as that of two-fin design, its significant pressure drop (flow resistance) had offset its superiority at low operating frequency, thereby leading to a least flowrate throughout the test range.
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Bruck, Hugh A. "Processing-Structure-Property Relationships in Hierarchically-Structured Polymer Composites for Multifunctional Structures." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59088.

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This research focuses on elucidating on the processing-structure-property relationship in hierarchically-structured polymer composites that are being developed for multifunctional structures. This is accomplished through characterization of the transition in mechanical behavior that occurs across length scales and compositions by: (a) development of model hierarchically-structured composite materials using a combination of model nanoscale and microscale ingredients (carbon nanofibers (CNFs) and carbon microfibers (CMFs)) reinforcing a High Impact Polystyrene (HIPS) thermoplastic polymer that can be extruded or solvent processed, (b) characterization and modeling of the transition compositions in the polymer nanocomposites through melt rheology, and (c) the effect of the CNF on the dynamic compressive behavior of CMF-reinforced polymer composites.
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Jang, Woong Ki, Yong Min Park, Young Ho Seo, and Byeong Hee Kim. "Fabrication of Hierarchical Micro-Nano Structures and Structural Coloring Effect of Polymer Substrate." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-3934.

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Recently, structural coloring using hierarchical micro-nano structures as a technical field to implement a color without using a chemical colourants and dye is being developed as an attentional technology. The principle of structural coloring is that by the diffraction or multi-interference of light from a material containing a periodic or quasiperiodic structure on the length scale of the wavelength of visible light. For these reason, our research have verified the structural coloring effect on the polymer substrate by fabricate a hierarchical micro-nano structures. Firstly, we have fabricate a nano and hierarchical micro-nano structured mold for verify the structural size effect. Through the replication of structures on the PMMA substrate, we have measured optical properties in the range of visible light. As a results, the surface of nano structured PMMA showed a blue color according to induced the light. Furthermore, color intensity was increased according to increase the aspect ratio and diameter. In contrast, hierarchical micro-nano patterned surface showed iridescent colors.
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Downen, Paul, Philip Johnson-Freyd, and Zena M. Ariola. "Structures for structural recursion." In ICFP'15: 20th ACM SIGPLAN International Conference on Functional Programming. ACM, 2015. http://dx.doi.org/10.1145/2784731.2784762.

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Georg, Gersende, Hugo Hernault, Marc Cavazza, Helmut Prendinger, and Mitsuru Ishizuka. "From rhetorical structures to document structure." In the 9th ACM symposium. ACM Press, 2009. http://dx.doi.org/10.1145/1600193.1600235.

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"Structure/Flow Interaction in Inflatable Structures." In 55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.iac-04-u.3.a.06.

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Nelson, A., D. J. Sanderson, and A. Stacey. "The Effects of Stress Redistribution Due to Member Failure on Structural Reliability of Offshore Steel Jackets." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28612.

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Current practice in providing structural integrity assurance of North Sea Steel Jacket structures relies upon periodic inspection of the sub-structures, with FMD being the preferred method of inspection. The time period between inspections, when employing FMD is dependent upon the structure’s level of redundancy. However, little, if any, consideration is given to the effect a failed member has on the stress distribution within the structure and the probability of a second member failing. A study has been completed that investigated the impact of stress redistribution following failure of a member. The study has considered the impact this has on fatigue lives of adjacent members/joints, and ultimately the impact on structural reliability. The findings from this study suggest that for the type of structures considered, the justification for a given inspection schedule should take due account of the impact of stress redistribution and the possibility that a structure might experience a second member failure during an inspection interval.
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Fares, Reine, Maria Paola Santisi d'Avila, Anne Deschamps, and Evelyne Foerster. "STRUCTURE-SOIL-STRUCTURE INTERACTION ANALYSIS FOR REINFORCED CONCRETE FRAMED STRUCTURES." In XI International Conference on Structural Dynamics. EASD, 2020. http://dx.doi.org/10.47964/1120.9231.19162.

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Lee, Yong Kyu, Seong-Joon Yoo, Kyoungro Yoon, and P. Bruce Berra. "Index structures for structured documents." In the first ACM international conference. ACM Press, 1996. http://dx.doi.org/10.1145/226931.226950.

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Reports on the topic "Structurs"

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Ebeling, Robert, та Barry White. Load and resistance factors for earth retaining, reinforced concrete hydraulic structures based on a reliability index (β) derived from the Probability of Unsatisfactory Performance (PUP) : phase 2 study. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/39881.

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This technical report documents the second of a two-phase research and development (R&amp;D) study in support of the development of a combined Load and Resistance Factor Design (LRFD) methodology that accommodates geotechnical as well as structural design limit states for design of the U.S. Army Corps of Engineers (USACE) reinforced concrete, hydraulic navigation structures. To this end, this R&amp;D effort extends reliability procedures that have been developed for other non-USACE structural systems to encompass USACE hydraulic structures. Many of these reinforced concrete, hydraulic structures are founded on and/or retain earth or are buttressed by an earthen feature. Consequently, the design of many of these hydraulic structures involves significant soil structure interaction. Development of the required reliability and corresponding LRFD procedures has been lagging in the geotechnical topic area as compared to those for structural limit state considerations and have therefore been the focus of this second-phase R&amp;D effort. Design of an example T-Wall hydraulic structure involves consideration of five geotechnical and structural limit states. New numerical procedures have been developed for precise multiple limit state reliability calculations and for complete LRFD analysis of this example T-Wall reinforced concrete, hydraulic structure.
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Heymsfield, Ernie, and Jeb Tingle. State of the practice in pavement structural design/analysis codes relevant to airfield pavement design. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40542.

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An airfield pavement structure is designed to support aircraft live loads for a specified pavement design life. Computer codes are available to assist the engineer in designing an airfield pavement structure. Pavement structural design is generally a function of five criteria: the pavement structural configuration, materials, the applied loading, ambient conditions, and how pavement failure is defined. The two typical types of pavement structures, rigid and flexible, provide load support in fundamentally different ways and develop different stress distributions at the pavement – base interface. Airfield pavement structural design is unique due to the large concentrated dynamic loads that a pavement structure endures to support aircraft movements. Aircraft live loads that accompany aircraft movements are characterized in terms of the load magnitude, load area (tire-pavement contact surface), aircraft speed, movement frequency, landing gear configuration, and wheel coverage. The typical methods used for pavement structural design can be categorized into three approaches: empirical methods, analytical (closed-form) solutions, and numerical (finite element analysis) approaches. This article examines computational approaches used for airfield pavement structural design to summarize the state-of-the-practice and to identify opportunities for future advancements. United States and non-U.S. airfield pavement structural codes are reviewed in this article considering their computational methodology and intrinsic qualities.
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Bell, Gary, and Duncan Bryant. Red River Structure physical model study : bulkhead testing. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40970.

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The US Army Corps of Engineers, St. Paul District, and its non-federal sponsors are designing and constructing a flood risk management project that will reduce the risk of flooding in the Fargo-Moorhead metropolitan area. There is a 30-mile long diversion channel around the west side of the city of Fargo, as well as a staging area that will be formed upstream of a 20-mile long dam (referred to as the Southern Embankment) that collectively includes an earthen embankment with three gated structures: the Diversion Inlet Structure, the Wild Rice River Structure, and the Red River Structure (RRS). A physical model has been constructed and analyzed to assess the hydraulic conditions near and at the RRS for verification of the structure’s flow capacity as well as optimization of design features for the structure. This report describes the modeling techniques and instrumentation used in the investigation and details the evaluation of the forces exerted on the proposed bulkheads during emergency operations for the RRS.
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Rahmani, Mehran, and Manan Naik. Structural Identification and Damage Detection in Bridges using Wave Method and Uniform Shear Beam Models: A Feasibility Study. Mineta Transportation Institute, 2021. http://dx.doi.org/10.31979/mti.2021.1934.

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This report presents a wave method to be used for the structural identification and damage detection of structural components in bridges, e.g., bridge piers. This method has proven to be promising when applied to real structures and large amplitude responses in buildings (e.g., mid-rise and high-rise buildings). This study is the first application of the method to damaged bridge structures. The bridge identification was performed using wave propagation in a simple uniform shear beam model. The method identifies a wave velocity for the structure by fitting an equivalent uniform shear beam model to the impulse response functions of the recorded earthquake response. The structural damage is detected by measuring changes in the identified velocities from one damaging event to another. The method uses the acceleration response recorded in the structure to detect damage. In this study, the acceleration response from a shake-table four-span bridge tested to failure was used. Pairs of sensors were identified to represent a specific wave passage in the bridge. Wave velocities were identified for several sensor pairs and various shaking intensities are reported; further, actual observed damage in the bridge was compared with the detected reductions in the identified velocities. The results show that the identified shear wave velocities presented a decreasing trend as the shaking intensity was increased, and the average percentage reduction in the velocities was consistent with the overall observed damage in the bridge. However, there was no clear correlation between a specific wave passage and the observed reduction in the velocities. This indicates that the uniform shear beam model was too simple to localize the damage in the bridge. Instead, it provides a proxy for the overall extent of change in the response due to damage.
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Fuller, Chris R. Active Structural Acoustic Control and Smart Structures. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada248341.

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Inman, Daniel J., Armaghan Salhian, and Pablo Tarazaga. Structural Dynamics of Cable Harnessed Spacecraft Structures. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada588127.

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Sullivan, Brian J., and Kent W. Buesking. Structural Integrity of Intelligent Materials and Structures. Defense Technical Information Center, 1994. http://dx.doi.org/10.21236/ada280941.

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Issa, Mohsen A. Structural Evaluation Procedures for Heavy Wood Truss Structures. Defense Technical Information Center, 1998. http://dx.doi.org/10.21236/ada362404.

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Allen, J., and J. Lauffer. Integrated structural control design of large space structures. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/10115453.

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Morphett, Jane, Alexandra Whittaker, Amy Reichelt, and Mark Hutchinson. Perineuronal net structure as a non-cellular mechanism of affective state, a scoping review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2021. http://dx.doi.org/10.37766/inplasy2021.8.0075.

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Is the perineuronal net structure within emotional processing brain regions associated with changes in affective state? The objective of this scoping review is to bring together the literature on human and animal studies which have measured perineuronal net structure in brain regions associated with emotional processing (such as but not limited to amygdala, hippocampus and prefrontal cortex). Perineuronal nets are a specialised form of condensed extracellular matrix that enwrap and protect neurons (Suttkus et al., 2016), regulate synaptic plasticity (Celio and Blumcke, 1994) and ion homeostasis (Morawski et al., 2015). Perineuronal nets are dynamic structures that are influenced by external and internal environmental shifts – for example, increasing in intensity and number in response to stressors (Blanco and Conant, 2021) and pharmacological agents (Riga et al., 2017). This review’s objective is to generate a compilation of existing knowledge regarding the structural changes of perineuronal nets in experimental studies that manipulate affective state, including those that alter environmental stressors. The outcomes will inform future research directions by elucidating non-cellular central nervous system mechanisms that underpin positive and negative emotional states. These methods may also be targets for manipulation to manage conditions of depression or promote wellbeing. Population: human and animal Condition: affective state as determined through validated behavioural assessment methods or established biomarkers. This includes both positive and negative affective states. Context: PNN structure, measuringPNNs.
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