Relevant bibliographies by topics / Cyclic matrice

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

Academic literature on the topic 'Cyclic matrice'

Author: Grafiati
Published: 9 March 2023
Last updated: 19 July 2025

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Journal articles on the topic "Cyclic matrice"

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Uygun, Hilmiye Deniz Ertugrul, Nihat Tinkilic, Azade Attar, and Ibrahim Isildak. "Development of Potentiometric Lactate Biosensor Based on Composite pH Sensor." Journal of New Materials for Electrochemical Systems 19, no. 3 (2016): 151–56. http://dx.doi.org/10.14447/jnmes.v19i3.313.

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In this study, a micro-sized lactate sensitive biosensor based on polyvinylchloride, quinhydrone and graphite composite pH sensing platform was developed. Lactate oxidase was immobilized on the composite layer as the biorecognition element. Transformation reaction of lactate to pyruvate and hydrogen peroxide was the basis of this biosensor system. In the reaction, hydrogen peroxide undergoes to give hydronium ions into solution, and the pH sensitive membrane detects the adjunct hydronium ions potentiometrically. The surface of lactate biosensor based composite pH sensing matrice was first examined for electrochemical elucidation by using cyclic voltammetry and electrochemical impedance spectroscopy. A linear response in concentration range from 5x10-5 to 1x10-1 mol/L was obtained with a detec-tion limit of 2x10-5 mol/L. The lactate biosensor developed was successfully applied for highly precise and efficient determination of lactate in food preparations. The biosensor exhibited a fast response time (10 s), had good stability, and had an extended lifetime.
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admin, admin, and Mohammad Abobala. "On The Computational Properties of 3-Cyclic and 4-Cyclic Refined Matrices and the Diagonalization Algorithm." International Journal of Advances in Applied Computational Intelligence 6, no. 2 (2024): 37–45. http://dx.doi.org/10.54216/ijaaci.060204.

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This paper is concerned with studying the matrix computations of 3-cyclic refined neutrosophic matrices and 4-cyclic refined neutrosophic matrices with 3cyclic4-cyclic real entries, where we introduce a novel method to compute eigenvalues and vectors of these matrix classes. Also, we provide a novel algorithm for diagonalization these matrices and to determine whether an n-cyclic refined matrix is diagonalizable or not for n=3, 4.
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Tarasov, Vitaly. "Cyclic monodromy matrices forsl(n) trigonometricR-matrices." Communications in Mathematical Physics 158, no. 3 (1993): 459–83. http://dx.doi.org/10.1007/bf02096799.

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Shinjo, Masato, Tan Wang, Masashi Iwasaki, and Yoshimasa Nakamura. "Roots of Characteristic Polynomial Sequences in Iterative Block Cyclic Reductions." Mathematics 9, no. 24 (2021): 3213. http://dx.doi.org/10.3390/math9243213.

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The block cyclic reduction method is a finite-step direct method used for solving linear systems with block tridiagonal coefficient matrices. It iteratively uses transformations to reduce the number of non-zero blocks in coefficient matrices. With repeated block cyclic reductions, non-zero off-diagonal blocks in coefficient matrices incrementally leave the diagonal blocks and eventually vanish after a finite number of block cyclic reductions. In this paper, we focus on the roots of characteristic polynomials of coefficient matrices that are repeatedly transformed by block cyclic reductions. We regard each block cyclic reduction as a composition of two types of matrix transformations, and then attempt to examine changes in the existence range of roots. This is a block extension of the idea presented in our previous papers on simple cyclic reductions. The property that the roots are not very scattered is a key to accurately solve linear systems in floating-point arithmetic. We clarify that block cyclic reductions do not disperse roots, but rather narrow their distribution, if the original coefficient matrix is symmetric positive or negative definite.
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Zheng, Yanpeng, and Xiaoyu Jiang. "Quasi-cyclic displacement and inversion decomposition of a quasi-Toeplitz matrix." AIMS Mathematics 7, no. 7 (2022): 11647–62. http://dx.doi.org/10.3934/math.2022649.

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<abstract><p>We study a class of column upper-minus-lower (CUML) Toeplitz matrices, which are "close" to the Toeplitz matrices in the sense that their ($ 1, -1 $)-cyclic displacements coincide with $ \varphi $-cyclic displacement of some Toeplitz matrices. Among others, we derive the inverse formula for CUML Toeplitz matrices in the form of sums of products of factor circulants by constructing the corresponding displacement of the matrices. In addition, by the relationship between CUML Toeplitz matrices and CUML Hankel matrices, the inverse formula for CUML Hankel matrices is also obtained.</p></abstract>
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Nadweh, Rama Asad, Rozina Ali, and Maretta Sarkis. "On The Algebraic Properties of 2-Cyclic Refined Neutrosophic Matrices and The Diagonalization Problem." Neutrosophic Sets and Systems 54 (April 11, 2023): 77–88. https://doi.org/10.5281/zenodo.7817646.

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The n-cyclic refined neutrosophic algebraic structures are very diverse and rich materials. In this paper, we study the elementary algebraic properties of 2-cyclic refined neutrosophic square matrices, where we find formulas for computing determinants, eigen values, and inverses. On the other hand, we solve the diagonalization problem of these matrices, where a complete algorithm to diagonlaize every diagonalizable 2-cyclic refined neutrosophic square matrix is obtained and illustrated by many related examples.
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Sergeev, A. "Interrelation of Symmetry and Antisymmetry of Quasi-Orthogonal Cyclic Matrices with Prime Numbers." Proceedings of Telecommunication Universities 8, no. 4 (2023): 14–19. http://dx.doi.org/10.31854/1813-324x-2022-8-4-14-19.

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Quasi-orthogonal Hadamard matrices and Mersenne matrices with two and three values of the elements, used in digital data processing, are considered, as well as the basis of error-correcting codes and algorithms for transforming orthogonal images. Attention is paid to the structures of cyclic matrices with symmetries and antisymmetries. The connection between symmetry and antisymmetry of structures of cyclic Hadamard and Mersenne matrices on a orders equal to prime numbers, products of close primes, composite numbers, powers of a prime number is shown. Separately, orders equal to the degrees of the prime number 2 are distinguished, both the orders of Hadamard matrices and the basis of the composite orders of Mersenne matrices of block structures with two element values. It is shown that symmetric Hadamard matrices of cyclic and bicyclic structures, according to the extended Riser boundary, do not exist on orders above 32. Mersenne matrices of composite orders belonging to the sequence of Mersenne numbers 2k ‒ 1 nested in the sequence of orders of the main family of Mersenne matrices 4t ‒ 1 exist in a symmetric and antisymmetric form. For orders equal to the powers of a prime number, Mersenne matrices exist in the form of block-diagonal constructions with three element values. The value of prime power determines the number of blocks along the diagonal of the matrix on which the elements with the third value are located. The cyclic blocks are symmetrical and antisymmetric.
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Neumann, Peter M., and Cheryl E. Praeger. "Cyclic Matrices Over Finite Fields." Journal of the London Mathematical Society 52, no. 2 (1995): 263–84. http://dx.doi.org/10.1112/jlms/52.2.263.

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Dazheng, Lin. "Fibonacci-Lucas Quasi-Cyclic Matrices." Fibonacci Quarterly 40, no. 3 (2002): 280–86. http://dx.doi.org/10.1080/00150517.2002.12428658.

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Tam, Bit-Shun. "On matrices with cyclic structure." Linear Algebra and its Applications 302-303 (December 1999): 377–410. http://dx.doi.org/10.1016/s0024-3795(99)00097-x.

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Dissertations / Theses on the topic "Cyclic matrice"

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Godeau, Amélie. "Cyclic contractions contribute to 3D cell motility." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF038/document.

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La motilité des cellules est un phénomène fondamental en biologie souvent étudié sur des surfaces planes, conditions peu physiologiques. Nous avons analysé la migration cellulaire dans une matrice cellulaire 3D contenant de la fibronectine fluorescente. Nous démontrons que les cellules y sont confinées, et déforment leur environnement de manière cyclique avec une période de ~14 min avec deux centres de contractions à l’avant et à l’arrière de la cellule qui contractent avec un déphasage de ~3.5 min. Une perturbation de ces cycles entraîne une réduction de la motilité. Par l’utilisation d’inhibiteurs spécifiques, nous avons identifié l’acto-myosine comme étant l’acteur principal de ce phénomène. En imposant des contractions-relaxations locales par ablations laser, nous avons déclenché la motilité cellulaire ce qui confirme notre hypothèse. L’ensemble de cette étude met en évidence un nouveau mécanisme fondamental de dynamique cellulaire impliqué dans le mouvement des cellules<br>Cell motility is an important process in Biology. It is mainly studied on 2D planar surfaces, whereas cells experience a confining 3D environment in vivo. We prepared a 3D Cell Derived Matrix (CDM) labeled with fluorescently labeled fibronectin, and strikingly cells managed to deform the matrix with specific patterns : contractions occur cyclically with two contraction centers at the front and at the back of the cell, with a period of ~14 min and a phase shift of ~3.5 min. These cycles enable cells to optimally migrate through the CDM, as perturbation of cycles led to reduced motility. Acto-myosin was established to be the driving actor of these cycles, by using specific inhibitors. We were able to trigger cell motility externally with local laser ablations, which supports this framework of two alternating contractions involved in motion. Altogether, this study reveals a new mechanism of dynamic cellular behaviour linked to cell motility
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Raud, Christophe. "Fissuration des composites carbone à matrice thermostable en traction isotherme et cyclage thermique." Cachan, Ecole normale supérieure, 1993. http://www.theses.fr/1993DENS0013.

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Ce travail vise a mieux comprendre les phénomènes qui régissent la microfissuration des stratifies carbone/matrice organique thermostable. Deux matériaux représentatifs des classes de température 200-250c (t800/5250 et t800/pmr-15), élaborés suivant plusieurs conditions de moulage, ont été étudiés. Il s'agit de déterminer l'influence des paramètres de fabrication sur la sensibilité a la microfissuration d'un drapage modelé 0#2,90#2#s dans des conditions de chargement quasi-statiques (traction uniaxiale) ou en sollicitation thermique alternée : en isotherme, des essais en traction statique interrompus a niveaux de charge croissants ont été effectues a -110, 20# et 250c avec suivi d'endommagement par rayons x et émission acoustique. Les résultats rendent compte d'une hiérarchie des lois d'apparition de fissures en fonction des contraintes thermiques installées. Cette hiérarchie n'est pas remise en cause lorsqu'on modifie la température d'essai. Des modèles analytiques fondes sur un critère énergétique de rupture (Flaggs & Kural, Laws & Dvorak, Nairn) ont été appliques pour prévoir l'accumulation des fissures; des sollicitations thermiques alternées sans chargement mécanique ont été réalisées entre 110 et +250c avec suivi par rayons x et émission acoustique et des courbes d'accumulation de fissures obtenues en fonction du nombre de cycles. La température maximale atteinte au cours de la mise en œuvre gouverne le nombre de cycles nécessaire à l'apparition de la première fissure ainsi que l'état de fissuration final. On met en évidence l'importance de la partie froide du cycle et celle de la vitesse de refroidissement. Dans la limite du nombre d'alternances (n60) qui a pu être explore, l'extension de l'endommagement est seulement fonction de l'amplitude de température et peut être, en première analyse, traitée en termes d'équivalence thermique-mécanique, le rôle de la vitesse restant à préciser.
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Racle, Elie. "Comportement d'un composite à matrice céramique en fatigue et mise en place d'indicateurs d'endommagement par émission acoustique." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0071.

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La compréhension du comportement d'un composite à matrice céramique (CMC) lorsqu'il est sollicité en fatigue est l'un des points clés pour permettre son utilisation dans un cadre industriel. Il est en effet nécessaire de déterminer la chronologie des différents mécanismes d'endommagement ainsi que d'estimer la durée de vie en conditions d'utilisation. Il est alors nécessaire de réaliser une caractérisation mécanique mais aussi de définir des indicateurs d'endommagement permettant la prévision de durée de vie. Dans ce but, il est intéressant de coupler l'analyse des paramètres mécaniques et les observations microstructurales à des techniques de suivi en temps réel de l'endommagement. L'émission acoustique (EA) est une méthode de suivi non destructive qui permet de répondre à cette problématique. Elle permet notamment de quantifier et de localiser l'endommagement. Dans ce travail, de nouveaux indicateurs d'endommagement sont mis en place tels la "Sévérité" des signaux définie à partir de l'énergie acoustique ainsi que la "Sentry function" définie à partir de l'énergie acoustique et de l'énergie mécanique. Ce travail s'articule autour de deux principaux axes. Dans un premier temps il s'agit de caractériser les effets de la sollicitation cyclique sur ce type de matériau, ceci notamment en comparant l'évolution des paramètres mécaniques, les observations microstructurales ainsi que l’analyse de l'évolution globale de l'émission acoustique (EA) lorsque le matériau est soumis à un chargement statique et à un chargement cyclique. La seconde partie consiste à déterminer un scenario d'endommagement. Dans un premier temps, les signaux d’EA sont analysés en fonction de leur détection dans le cycle (charge/décharge). Ensuite la détermination de la signature acoustique des différents mécanismes d'endommagement par application de techniques de reconnaissance de formes supervisées a permis d'évaluer leur chronologie d'activation durant les essais de fatigue cyclique. Cette étude a permis de mettre en évidence un ensemble de mécanismes propres à la sollicitation cyclique, composé principalement de décohésion et de frottement aux interfaces fibre/matrice et matrice/matrice. De plus, l'utilisation de l'émission acoustique a permis de définir des temps caractéristiques ou critiques pouvant être utilisés dans un objectif de prévision de la durée de vie. En effet, par exemple la sévérité des signaux a permis de mettre en évidence un temps caractéristique situé entre 25 et 45% de la durée de vie du matériau. La détection en temps réel de ce temps caractéristique permet d'estimer la durée de vie restante<br>The full understanding of a ceramic matrix composite under fatigue loading is needed in view of industrial applications. It is necessary to determine the damage mechanisms chronology and to be able to forecast the lifetime of the material in the conditions of use. To reach these purposes, a mechanical characterisation has to be done as well as the definition of damage indicators. It is then interesting to link the analysis of mechanical parameters and microscope observations with a non-destructive monitoring technique. Acoustic emission (AE) appears to be a good candidate to monitor material damage under loading. It makes the quantification and the material damage localisation possible. In this study, indicators based on released acoustic energy are used as "Severity" of signals or "Sentry function" which depends on both acoustic and mechanical energies. This work is organised in two parts. First, the analysis of mechanical parameters behaviour, material microstructure and global evolution of acoustic emission under static and cyclic loading makes the characterisation of the effects of cyclic fatigue on the material possible. The second part consists in determining a damage scenario. First acoustic emission signals are analysed depending on their acquisition during a cycle (loading or unloading). Then the connection between the acoustic emission signals and the different damage mechanisms, using a supervised clustering method, facilitated the estimation of the activation of these different damage mechanisms during cyclic fatigue tests. This study pointed out different damage mechanisms generated by cyclic loading, which are mainly debonding and friction at matrix/fibre and matrix/matrix interfaces. In addition, damage indicators based on acoustic emission enabled to determine characteristic times which can be used for lifetime forecast. For example, signal severity shows a characteristic time between 25% and 45% of the time to ultimate failure. Detection of this time in real-time during a test can be used to estimate the time of the ultimate failure of the material
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Shi, Yue. "Micro-mechanics-based models of monotonic and cyclic behaviors of quasi-brittle rock-like materials having an elasto-viscoplastic matrix with microcracks." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2023/2023ULILN057.pdf.

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L'objectif principal de cette thèse est de modéliser le comportement mécanique macroscopique des géomatériaux dans des conditions de chargement instantané et dépendant du temps. Dans ce contexte, le matériau étudié est modélisé du point de vue de la microstructure en utilisant des schémas de localisation et d'homogénéisation bien adaptés. À l'échelle microscopique, on suppose que les microfissures ont une morphologie en forme de penny et qu'elles sont intégrées de manière aléatoire dans une matrice solide isotrope. Dans le cadre de la thermodynamique, deux variables internes, la déformation inélastique et les dommages induits par les microfissures, sont toutes deux classées en fonction de la microfissuration instantanée et de la microfissuration sous-critique. L'endommagement instantané est régi par une force thermodynamique conjuguée, tandis que l'endommagement dépendant du temps évolue vers l'équilibre de la microstructure. En outre, l'accent est mis sur la modélisation de la matrice solide en tant que composante de cohésion-friction. Cela nécessite l'introduction d'une nouvelle variable interne, la déformation plastique de la matrice, qui se traduit par une transition fragile-ductile plus claire dans le régime de pré-crête, en particulier sous des pressions de confinement relativement élevées. Ensuite, la matrice plastique compressible est décrite séparément par une règle d'écoulement associée et une règle d'écoulement non associée, en comparaison avec un grand nombre de résultats d'essais. Il s'avère que le modèle non associé peut bien reproduire la transition compaction-dilatation avec des nombres cycliques. Enfin, le modèle unifié est développé pour étudier le comportement à long terme en termes de viscoplasticité de la matrice. Les mécanismes de déformation sont analysés en ce qui concerne le couplage entre la viscoplasticité de la matrice et la propagation sous-critique des microfissures<br>The primary objective of this thesis is to model the macroscopic mechanical behavior of geomaterials under both instantaneous and time-dependent loading conditions. In this context, the studied material is modeled from the view of microstructure using well-suited localization and homogenization schemes. At the microscopic scale, it is assumed that microcracks have a penny-shaped morphology and are randomly embedded in an isotropic solid matrix. In framework of thermodynamics, two internal variables, inelastic strain and microcrack-induced damage, are both classified in consideration of instantaneous microcracking and sub-critical microcracking. The instantaneous damage is driven by a conjugated thermodynamics force, while the time-dependent damage evolves towards microstructure equilibrium. Further, the emphasis is put on modeling the solid matrix as a cohesive-friction component. This needs to introduce a new internal variable, plastic strain of matrix, resulting in a clearer brittle-ductile transition in the pre-peak regime, especially under relative high confining pressures. Next, the plastic compressible matrix is separately described by an associated and a non-associated flow rule in comparison with a large amount of test results. It is found that the non-associated model can well reproduce the compaction-dilatation transition with cyclic numbers. Finally, the unified model is developed to investigate the long-term behavior in terms of matrix viscoplasticity. The deformation mechanisms are analyzed regarding the coupling between matrix viscoplasticity and sub-critical propagation of microcracks
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DI, GRAVINA LUCA MARIA. "Some questions about the Möbius function of finite linear groups." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/371474.

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La funzione di Möbius definita per insiemi parzialmente ordinati localmente finiti è un classico strumento di analisi combinatoria. Si tratta di una generalizzazione della funzione di Möbius nota in teoria dei numeri e ha varie applicazioni pure in teoria dei gruppi, dalla caratteristica di Eulero di complessi di sottogruppi fino allo studio di aspetti algebrici in automi cellulari. Nella prima parte della tesi richiamiamo alcune informazioni elementari per strutture d'ordine che sono legate alla funzione di Möbius, e ne presentiamo le principali proprietà, quali ad esempio la formula di inversione di Möbius e i teoremi di Crapo. Inoltre analizziamo alcuni legami importanti con argomenti di teoria dei gruppi, al fine di motivare il nostro interesse nei confronti della funzione di Möbius di gruppi lineari finiti. Nella seconda parte, lavoriamo su questi gruppi per studiarne la funzione di Möbius e otteniamo risultati originali che si rivelano utili per calcolarla, nota la struttura di alcuni particolari reticoli di sottospazi associati ai sottogruppi. Vediamo in dettaglio il caso in cui abbiamo un reticolo di sottospazi distributivo. In seguito mostriamo un esempio di sottogruppo del gruppo lineare generale, tale che il reticolo di sottospazi associato al sottogruppo non è distributivo. In questo modo osserviamo che i nostri ragionamenti hanno una validità più ampia e possono essere applicati a situazioni differenti, sotto determinate condizioni. Nell'ultima parte della tesi, colleghiamo i risultati ottenuti in precedenza ad alcune questioni aperte che riguardano gruppi profiniti finitamente generati e gruppi finiti almost-simple, presentando un approccio originale al problema. Benché poi questo problema non venga completamente risolto, otteniamo degli utili risultati parziali che possono essere sviluppati in futuro.<br>The Möbius function of locally finite partially ordered sets is a classical tool in enumerative combinatorics. It is a generalization of the number-theoretic Möbius function and it has several applications in group theory, from the Euler characteristic of subgroup complexes to algebraic aspects of cellular automata. In the first part of the thesis, we recall some basic notions about the order structures which are related to the Möbius function, and we present its main properties, such as the Möbius inversion formula and Crapo's theorems. Moreover, we investigate some relevant connections with group-theoretical topics to motivate our interest in the Möbius function of finite linear groups. In the second part, we work on these groups to obtain information about their Möbius function, and our original results are useful to compute it if we know the structure of some special subspace lattices related to subgroups. We study in detail the case of distributive subspace lattices. Then we show an example of a subgroup in the general linear group, such that the subspace lattice associated to the subgroup is non-distributive. In this way, we see that our arguments can also be applied to different situations, under certain conditions. In the last part of the thesis, we connect the previously obtained results to an open question about finitely generated profinite groups and finite almost-simple groups, introducing an original approach to the problem. Although we do not completely answer to this last question, we get some useful partial results.
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Dridi, Marwa. "Sur les méthodes rapides de résolution de systèmes de Toeplitz bandes." Thesis, Littoral, 2016. http://www.theses.fr/2016DUNK0402/document.

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Cette thèse vise à la conception de nouveaux algorithmes rapides en calcul numérique via les matrices de Toeplitz. Tout d'abord, nous avons introduit un algorithme rapide sur le calcul de l'inverse d'une matrice triangulaire de Toeplitz en se basant sur des notions d'interpolation polynomiale. Cet algorithme nécessitant uniquement deux FFT(2n) est manifestement efficace par rapport à ses prédécésseurs. ensuite, nous avons introduit un algorithme rapide pour la résolution d'un système linéaire de Toeplitz bande. Cette approche est basée sur l'extension de la matrice donnée par plusieurs lignes en dessus, de plusieurs colonnes à droite et d'attribuer des zéros et des constantes non nulles dans chacune de ces lignes et de ces colonnes de telle façon que la matrice augmentée à la structure d'une matrice triangulaire inférieure de Toeplitz. La stabilité de l'algorithme a été discutée et son efficacité a été aussi justifiée. Finalement, nous avons abordé la résolution d'un système de Toeplitz bandes par blocs bandes de Toeplitz. Ceci étant primordial pour établir la connexion de nos algorithmes à des applications en restauration d'images, un domaine phare en mathématiques appliquées<br>This thesis aims to design new fast algorithms for numerical computation via the Toeplitz matrices. First, we introduced a fast algorithm to compute the inverse of a triangular Toeplitz matrix with real and/or complex numbers based on polynomial interpolation techniques. This algorithm requires only two FFT (2n) is clearly effective compared to predecessors. A numerical accuracy and error analysis is also considered. Numerical examples are given to illustrate the effectiveness of our method. In addition, we introduced a fast algorithm for solving a linear banded Toeplitz system. This new approach is based on extending the given matrix with several rows on the top and several columns on the right and to assign zeros and some nonzero constants in each of these rows and columns in such a way that the augmented matrix has a lower triangular Toeplitz structure. Stability of the algorithm is discussed and its performance is showed by numerical experiments. This is essential to connect our algorithms to applications such as image restoration applications, a key area in applied mathematics
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Kahn, Cyril. "Ingénierie tissulaire des ligaments : conception d'un bioréacteur et étude des propriétés mécaniques." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL010N/document.

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L’ingénierie tissulaire vise à l’élaboration de prothèses biologiques par la régénération ou la culture, in vitro ou in vivo, de tissus ou d’organes. Dans la stratégie de culture in vitro, le développement de nouveaux outils, tels que des bioréacteurs, permettant la culture de cellules ou de tissus sous sollicitations mécaniques spécifiques au tissu est primordial. De plus, l’avancée de cette discipline dans la régénération des tissus nécessite de développer, dès à présent, des méthodes d’évaluation mécanique satisfaisantes permettant de comparer ces néo-tissus aux tissus sains selon des critères de sollicitations physiologiques. En effet, pour parvenir à une bonne évaluation de ces matériaux, il est nécessaire de pouvoir les tester sur des chargements représentatifs des sollicitations physiologiques auxquelles ils sont soumis. Nous avons ainsi, dans un premier temps, conçu et développé un bioréacteur de ligaments permettant la culture de cellules stimulées mécaniquement par des sollicitations cycliques de traction-torsion. Ce bioréacteur a été dimensionné afin de pouvoir obtenir des bio-prothèses de taille comparable aux ligaments et tendons à remplacer (4 à 5 cm de long). Nous avons, dans un deuxième temps, développé un modèle du comportement mécanique global de ces tissus à partir du formalisme thermodynamique développé au sein de notre laboratoire et des observations faites sur des tendons d’Achille de lapin. Ce modèle a pour but d’approfondir la compréhension des structures intervenant de façon prépondérante dans la qualité mécanique de ces tissus ainsi que l’évaluation et l’optimisation des matrices de support et des néo-tissus devant s’y substituer<br>Tissue Engineering aims to fabricate bio-prostheses by regenerating or culture, in vivo or in vitro, tissues or organs. In the in vitro strategy, developing new tools such as bioréactors which allow the culture of cells or tissues under their specific mechanical solicitations is a huge point. Moreover, the last advances of this discipline in regeneration of tissues require new mechanical model allowing their evaluation and comparison to native tissue under physiological loading. Indeed, in order to obtain a good evaluation of their mechanical quality, it is important to be able to applied mechanical solicitations linked to physiological ones. As a first step, a bioreactor of ligament allowing the culture of cells under mechanical solicitations of cyclic traction-torsion was designed and developed. This bioreactor was sized to potentially obtain a bio-prosthesis comparable to native tissue in term of size (4 to 5 cm long). In a second time, a mechanical model was elaborated based on a thermodynamic formalism developed in our laboratory and the observation made on rabbit Achilles tendons. The goals of this model are to improve our knowledge on the mayor structures involved into the mechanical quality of theses tissues and to evaluate and optimise the scaffolds and neo-tissues of substitution
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吳堉榕 and Yuk-yung Ng. "Cyclic menon difference sets, circulant hadamard matrices and barker sequences." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31211823.

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Ng, Yuk-yung. "Cyclic menon difference sets, circulant hadamard matrices and barker sequences /." [Hong Kong] : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13814291.

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Craciun, Ovidiu Engineering &amp Information Technology Australian Defence Force Academy UNSW. "Matric suction response of unbound granular base materials subject to cyclic loading." Awarded by:University of New South Wales - Australian Defence Force Academy. Engineering & Information Technology, 2009. http://handle.unsw.edu.au/1959.4/43927.

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The emergence of analytically-based pavement design has encouraged investigations toward a better understanding of the behaviour of pavement layers under cyclic loading. Unbound granular base (UGB) materials are commonly placed as base course layers in the design of pavement foundations. Due to their nature and geometry they are unsaturated geo-materials and therefore, it is desirable to study their behaviour using the framework of unsaturated soil mechanics. Current literature reflects very limited achievements in this direction. This thesis presents the development of a cyclic triaxial testing system and associated testing methodology that meets the challenges of testing an UGB material as an unsaturated soil. The testing system enables the initialisation of a specimen to target matric suction and facilitates direct measurement of its evolution under cyclic loading. In conjunction with the use of accurate on-specimens strain measurement transducers, ???clean??? strain and matric suction cyclic responses are obtained. Two types of cyclic triaxial testing are investigated: with constant cell pressure (i.e., CSeries testing) and with varying (cyclic) cell pressure where both axial and radial stress components are simultaneously (and in phase) pulsed (i.e., V-Series testing). Different initial matric suctions, si will be imposed in the testing program and the influence of si on material behaviour is analysed. This is investigated in a similar manner for C- and V-Series testing. The influence of si appears to be significant for both cyclic and permanent strain responses. A strong stress path dependency is found to characterise the behaviour of the UGB material. Under a wide range of cyclic deviator stress magnitudes, permanent strain response is found to correlate with that of matric suction response. Both appear to indicate better the relative performance of a UGB material than the response of resilient modulus. Another particular aspect investigated is the influence of additional fines on the behaviour of the UGB material. To ???isolate??? the effects of additional fines the cyclic and permanent strain responses of ???equivalent??? specimens with equivalent compaction and unsaturation condition, but different fines content, are compared. The results showed that the relative performance of the two materials (distinguished by the different percentage of fines content) in intertwined with the strong stress path dependency. It is also found that a material compacted at higher dry density may not improve its behaviour under cyclic loading, but may worsen with load cycles. Soil-water characteristic curve tests are conducted for the UGB materials investigated, showing high sensitivity of initial matric suction to moisture content, which increases further for the material with additional fines. This explains the notion of ???sensitivity??? of UGB materials as commonly suggested by practicing pavement engineers.
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Books on the topic "Cyclic matrice"

1

N, Lee Kang, Miller Robert A. 1947-, and NASA Glenn Research Center, eds. Thermal conductivity and thermal gradient cyclic behavior of refractory silicate coatings on SiC/SiC ceramic matrix composites. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Castelli, Michael G. Characterization of damage progression in SCS-6/Timetal 21S [0]₄ under thermomechanical fatigue loadings. National Aeronautics and Space Administration, 1994.

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S, Majumdar Bhaskar, and United States. National Aeronautics and Space Administration., eds. In-phase thermomechanical fatigue mechanisms in an unidirectional SCS-6/Ti 15-3 MMC. National Aeronautics and Space Administration, 1995.

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S, Majumdar Bhaskar, and United States. National Aeronautics and Space Administration., eds. In-phase thermomechanical fatigue mechanisms in an unidirectional SCS-6/Ti 15-3 MMC. National Aeronautics and Space Administration, 1995.

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S, Majumdar Bhaskar, and United States. National Aeronautics and Space Administration., eds. In-phase thermomechanical fatigue mechanisms in an unidirectional SCS-6/Ti 15-3 MMC. National Aeronautics and Space Administration, 1995.

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Heijungs, Reinout. The Computational Structure of Life Cycle Assessment. Springer Netherlands, 2002.

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Kevin, O'Brien T., Rousseau Carl Q, and United States. National Aeronautics and Space Administration., eds. Fatigue life methodology for tapered composite flexbeam laminates. National Aeronautics and Space Administration, 1997.

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Kevin, O'Brien T., Rousseau Carl Q, and United States. National Aeronautics and Space Administration., eds. Fatigue life methodology for tapered composite flexbeam laminates. National Aeronautics and Space Administration, 1997.

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Kevin, O'Brien T., Rousseau Carl Q, and Langley Research Center, eds. Fatigue life methodology for tapered composite flexbeam laminates. National Aeronautics and Space Administration, Langley Research Center, 1997.

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Kevin, O'Brien T., Rousseau Carl Q, and Langley Research Center, eds. Fatigue life methodology for tapered composite flexbeam laminates. National Aeronautics and Space Administration, Langley Research Center, 1997.

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Book chapters on the topic "Cyclic matrice"

1

Chawla, Nikhilesh, and Krishan K. Chawla. "Cyclic Fatigue." In Metal Matrix Composites. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9548-2_8.

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Chawla, K. K. "Mechanical behavior: load transfer; monotonic, cyclic and creep behavior." In Ceramic Matrix Composites. Springer US, 1993. http://dx.doi.org/10.1007/978-1-4757-2216-1_7.

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Chawla, K. K. "Mechanical Behavior: Load Transfer; Monotonic, Cyclic, and Creep Behavior." In Ceramic Matrix Composites. Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-1029-1_7.

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Vulfson, Iosif. "Vibration Analysis of Cyclic Machines Using Modified Transition Matrices." In Foundations of Engineering Mechanics. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12634-0_8.

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Bertolazzi, Enrico. "Parallel Cyclic Reduction of Bordered Almost Block Diagonal Matrices." In Lecture Notes in Computer Science. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-81244-6_3.

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Rouby, D., O. Penas, and P. Reynaud. "Anelastic Behaviour of Ceramic Matrix Composites during Cyclic Fatigue." In High Temperature Ceramic Matrix Composites. Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527605622.ch68.

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Audit, Philippe. "Use of Cyclic Matrices to Obtain Analytic Expressions for Crystals." In Springer Series in Solid-State Sciences. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82444-9_9.

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Zhiyong, Zheng, Liu Fengxia, Huang Wenlin, Xu Jie, and Tian Kun. "A Generalization of NTRUEncrypt." In Financial Mathematics and Fintech. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2366-3_6.

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AbstractThe main purpose of this chapter is to give a more general construction of NTRU based on ideal matrices and q-ary lattice theory. To understand our construction, first we discuss a more general form of the ordinary cyclic code, namely $$\phi $$ ϕ -cyclic code, which firstly appeared in (Lopez-Permouth et al., 2009; Shi et al., 2020); thus, we give a more generalized NTRUEncrypt from replacing finite field by real number field $$\mathbb {R}$$ R .
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Zheng, Zhiyong, Kun Tian, and Fengxia Liu. "Cyclic Lattices and Ideal Lattices." In Financial Mathematics and Fintech. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-7644-5_5.

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AbstractCyclic lattices and ideal lattices were introduced by Micciancio in [45], Lyubashevsky and Micciancio in [40], respectively, which play an efficient role in Ajtai’s construction of a collision-resistant Hash function and in Gentry’s construction of fully homomorphic encryption [22]. Let $$R=\mathbb {Z}[x]/&lt;\phi (x)&gt;$$ be a quotient ring of the integer coefficients polynomials ring, Lyubashevsky and Micciancio regarded an ideal lattice as the correspondence of an ideal of R, but they neither explain how to extend this definition to whole Euclidean space $$\mathbb {R}^n$$, nor exhibit the relationship of cyclic lattices and ideal lattices. In this chapter, we regard the cyclic lattices and ideal lattices as the correspondences of finitely generated R-modules, so that we may show that ideal lattices are actually a special subclass of cyclic lattices, namely cyclic integer lattices. It is worth noting that we use more general rotation matrix here, so our definition and results on cyclic lattices and ideal lattices are more general forms. As application, we provide cyclic lattice with an explicit and countable upper bound for the smoothing parameter. Our results may be viewed as a substantial progress in this direction.
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Xu, Hengzhou, Baoming Bai, Hai Zhu, Mengmeng Xu, and Bo Zhang. "Quasi-Cyclic LDPC Codes Constructed Based on Row-Column Constrained Matrices." In Communications in Computer and Information Science. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7877-4_27.

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Conference papers on the topic "Cyclic matrice"

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Lua, Jim, Anisur Rahman, Dinh Pham, and Nam Phan. "A Progressive Damage Model for Fatigue Analysis of Woven Fabric Composites." In Vertical Flight Society 74th Annual Forum & Technology Display. The Vertical Flight Society, 2018. http://dx.doi.org/10.4050/f-0074-2018-12889.

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An efficient two-step progressive damage model has been developed to predict the accumulated damage and fatigue life of woven fabric composite materials. A stress-based failure criterion coupled with a continuum damage approach is employed to predict the damage in fabric materials when loaded up to the desired stress level. Upon fatigue cyclic loading, fatigue damage initiation and propagation in the warp and weft tows, in the matrix constituent and their interfaces are evaluated with S-N based accumulation models characterizing the cycle-dependent strengths in the fiber tows and the matrix subject to tension, compression and shear loading. Nonlinear shear behavior of the matrix is characterized by a curve-fit nonlinear shear model from the static coupon test data of (+45/-45) plain weave. The fatigue cycles of each element in the fiber tows, matrix region and their interface are computed via a Newton iteration method and a numerical procedure is performed to effectively estimate the next proceeding cycles based on the element dominated failure mode. A stiffness reduction method is applied once constituent fatigue damage is indicated in each cycle increment, and the stress field is updated accordingly for further loading cycles. The predictive capabilities of the developed fatigue model are demonstrated using tension-tension fatigue of SYNCOGLAS R420 E-glass woven fabrics and T300 5HS/914 dog-bone specimens of different layups.
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Miyashita, Junki, Takahiro Tsuda, and Kenji Horikiri. "Evaluation of Protective Coating Performance in a Cyclic-Temperature Environment." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07304.

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Abstract A cyclic-temperature environment is recognized as a severe condition for coatings. In oil and gas plant facilities a dehydrator is a typical kind of equipment operating in the most severe cyclic-temperature environment ranging from ambient to 300 deg-C. For a dehydrator, three coatings (i.e., “a heat resistant silicone liquid coating”, “an inorganic copolymer or coatings with an inert multipolymeric matrix liquid coating” or “a thermal sprayed aluminum coating”) are typically applied. However, no experimental data comparing the performance of these coatings, i.e., heat cycle stability and corrosion resistance, under standard test conditions have been reported. Furthermore, no standard test method has been established to evaluate the coating performance in a cyclic-temperature environment ranging from ambient temperature to 300 deg-C. This paper summarizes an overview of coatings for a cyclic-temperature environment first, and proposes a simple test method which includes a heat cycle between 21 to 300 deg-C simulating the dehydrator operation and exposure to salt spray. The performances of the three coatings were evaluated using this method. Finally, based on the test results and on information from recent process plant construction projects, factors to be considered for coating selection in the cyclic-temperature environment are discussed.
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Isdrailă, Tudor-Alexandru, and Jun-Yi Wu. "Evaluating cyclic translational symmetry in boson sampling systems with few detectors." In Quantum 2.0. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/quantum.2024.qtu3a.5.

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Tomography of multi-photon states represents a complex procedure requiring a large number of photon number resolving detectors. By expanding an efficient single-photon tomography protocol we recover a reduced density matrix with just two detectors.
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Macha, Erica N., and James F. Dante. "Characterization of Accelerated Test Environments Using Galvanically Coupled Multi-Electrode Arrays." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05982.

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Abstract The difficulty of replicating service-environment corrosion failure modes in accelerated laboratory testing is a well-known and well-documented challenge facing the atmospheric corrosion community. Several recent studies have highlighted the importance of cyclic variations in the test environment for recreating corrosion damage which is similar to real-world damage. A thorough understanding of the effects of these cyclic variations is critical to the development of improved accelerated tests. In this work, multi-electrode arrays and corrosion sensors are used to characterize the corrosion susceptibility of metals and galvanic couples exposed to several common accelerated tests. A multi-electrode array of steel in an aluminum matrix is used to simulate a steel fastener in an aerospace aluminum panel. Spatial distributions of current are examined as a function of the test environment and cycle.
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Mazumder, Golam Rakib, Souvik Chakraborty, Mahbub Alam Maruf, Jeffrey C. Suhling, and Pradeep Lall. "Incorporation of Damage in Creep Models for SAC305 Lead Free Solder." In ASME 2023 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/ipack2023-112030.

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Abstract Solder joints in electronic packages often experience fatigue failures due to cyclic mechanical stresses and strains in fluctuating temperature environments. This cyclic loading of the solder is induced by mismatches in coefficients of thermal expansion and leads to damage accumulation that contributes to crack initiation, crack propagation, and eventually to failure. In our previous paper at InterPACK 2022, we investigated the accumulation of damage in several lead-free solder materials during mechanical cycling. Circular cross-sectioned solder specimens were first reflowed, and these samples were then mechanically cycled at room temperature for various durations using a Micro-Mechanical tester. Monotonic stress-strain and creep tests were then conducted on the prior cycled samples to characterize the change in mechanical behavior occurring in the solder due to damage accumulation. Using the data from these tests, we have been able to characterize and quantify the cycling induced damage through the observed degradations of several mechanical properties (elastic modulus, yield strength, ultimate strength, and creep strain rate) with the amount of prior cycling. In addition, changes in the microstructure and growth of microcracks during cycling have been characterized. In the current work, we have extended the experimental work in our prior studies on SAC305 to examine the evolution of the creep response due to prior damage accumulation at elevated temperature. In the experimental testing, small uniaxial cylindrical samples of SAC305 solder were prepared and reflowed in a reflow oven. These specimens were then mechanically cycled under several different sets of conditions to induce various levels of damage in the samples. Four levels of initial damage per cycle were considered (ΔW = 0.25, 0.50, 0.75 and 1.00 MJ/m3 at 100 °C For each of these damage levels per cycle, various durations of cycling were applied (e.g., 0, 50, 100, 300, and 600 cycles). This test matrix generated a large set of prior damaged samples, where the damage had been accumulated at different rates (different damage amounts per cycle), different cycling temperatures, and for different durations. Creep tests were performed on the prior damage samples at room and elevated temperatures and at stress level of σ = 10 MPa. The changes in the steady state secondary creep rate were then evaluated and plotted versus the duration of cycling for the various applied levels of damage per cycle. Exponential empirical models were found to fit the material property degradations well for any one set of conditions. More importantly, It was found that the total energy dissipation that had occurred in the sample (ΣΔW = sum of ΔW for all cycles) could be used as a governing degradation parameter independent of the damage level applied during each cycle. In particular, all of the material property data for a selected property and temperature were modeled well using a single degradation curve independent of that rate the damage was accumulated. We are also using the data in our studies to incorporate damage parameters into popular constitutive models for solder such as the Norton and Garofalo creep models, and the Anand viscoplastic model.
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Mazumder, Golam Rakib, Mohammad Ashraful Haq, Jeffrey C. Suhling, and Pradeep Lall. "Effects of Mechanical Cycling Induced Damage on the Creep Response of SAC305 Solder." In ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/ipack2022-93878.

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Abstract In electronic packaging, lead-free solders often experience fatigue failures due to thermal-mechanical cyclic stress and strain caused by changing temperatures and mismatches in thermal expansion coefficients. As a result, damage accumulates in the solder joints including plastic deformation, crack initiation, crack propagation, and finally failure occur. In our previous work, changes in the mechanical behavior of SAC305 lead free solder due to prior damage accumulation was investigated. Circular cross-section solder specimens were first reflowed, and these samples were then mechanically cycled for various durations using a Micro-Mechanical tester. Monotonic stress-strain tests were subsequently conducted on the prior cycled samples to characterize the change in mechanical behavior occurring in the solder due to damage accumulation. Using the data from these tests, we were able to characterize and quantify the cycling induced damage through the observed degradations of several mechanical properties (initial elastic modulus, yield stress, and ultimate tensile strength) with the amount of prior cycling. In the current work, we have extended the experimental work in our prior studies on SAC305 to examine the evolution of the creep response due to prior damage accumulation. In the experimental testing, small uniaxial cylindrical samples of SAC305 solder were prepared and reflowed in a reflow oven. These specimens were then mechanically cycled under several different sets of conditions to induce various levels of damage in the samples. In particular, four levels of initial damage per cycle were considered (ΔW = 0.25, 0.50, 0.75 and 1.00 MJ/m3), as well as three cycling temperatures (T = 25, 100, and 125 °C). For each of these damage levels per cycle, various durations of cycling were applied (e.g., 0, 50, 100, 300, and 600 cycles). This test matrix generated a large set of prior damaged samples, where the damage had been accumulated at different rates (different damage amounts per cycle), different cycling temperatures, and for different durations. In this paper, selected results obtained for isothermal mechanical cycling at T = 25 °C will be presented in detail. Creep tests were performed on the prior damage samples at room temperature and several stress levels including σ = 10.0, 12.0, and 15.0 MPa. The changes in the steady state secondary creep rate were then evaluated and plotted versus the duration of cycling for the various applied levels of damage per cycle. Exponential empirical models were found to fit the material property degradations well for any one set of conditions. More importantly, it was found that the total energy dissipation that had occurred in the sample (sum of ΔW for all cycles) could be used as a governing failure variable independent of the damage level applied during each cycle. In particular, all of the creep rate data for a selected stress level were modeled well using a single degradation curve independent of that rate the damage was accumulated. Using the results of this study, we are working to develop better damage mechanics models and fatigue criteria for lead free solders that are subjected to variable temperature applications.
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Sharma, Pradeep, and Abhijit Dasgupta. "The Connection Between Microstructural Damage Modeling and Continuum Damage Modeling for Eutectic Sn-Pb Solder Alloys." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39185.

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Researchers resort to a wide range of simplified representations at the continuum scale, to model creep-fatigue damage in viscoplastic heterogeneous materials such as Sn-Pb eutectic solders, caused by thermo-mechanical and mechanical cyclic loading (e.g. due to power cycling, environmental temperature cycling, vibration, etc). Typically, in macroscale phenomenological damage models, the cyclic damage is assumed to depend on some loading parameter such as cyclic strain range, work dissipation per cycle, partitioned strain range, partitioned work dissipation per cycle, cyclic entropy changes, cyclic stress range, integrated matrix creep, etc. In many instances, some of these variables are weighted with a factor to account for rate-dependent effects. The task of finding the best damage metric is difficult because of complex microstructural interactions between cyclic creep and cyclic plasticity due to the high homologous temperature under operating conditions. In this study we use insights obtained from microstructural and more mechanistic modeling to identify the most appropriate macro-scale damage metrics. The microstructural models are based on such phenomena as grain boundary sliding, blocking of grain boundary sliding by second-phase particles, grain boundary, volumetric and surface diffusion, void nucleation, void growth and plastic collapse of cavitating grain boundaries. As has been demonstrated in the literature, microstructural models suggest that fatigue damage caused by cyclic plasticity should correlate well with the two most commonly used damage indicators: both cyclic strain range and plastic work dissipation per cycle. This study, however, demonstrates that in the case of damage dominated by cyclic creep, microstructural models developed by the authors indicate closer correlation with creep work dissipation per cycle, than with cyclic creep strain range.
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Alieva, Tatiana, and Martin J. Bastiaans. "Powers of transfer matrices and cyclic cascades." In ICO XVIII 18th Congress of the International Commission for Optics, edited by Alexander J. Glass, Joseph W. Goodman, Milton Chang, Arthur H. Guenther, and Toshimitsu Asakura. SPIE, 1999. http://dx.doi.org/10.1117/12.355031.

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Xu, Guangjie, Huali Wang, Weijun Zeng, Qingguo Wang, and Jun Jin. "Compressed sampling using structurally mixed cyclic measurement matrices." In 2014 Sixth International Conference on Wireless Communications and Signal Processing (WCSP). IEEE, 2014. http://dx.doi.org/10.1109/wcsp.2014.6992206.

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Matyushkin, Igor, and Pavel Rubis. "CELLULAR AUTOMATA ALGORITHMS FOR PSEUDORANDOM NUMBERS GENERATION." In International Forum “Microelectronics – 2020”. Joung Scientists Scholarship “Microelectronics – 2020”. XIII International conference «Silicon – 2020». XII young scientists scholarship for silicon nanostructures and devices physics, material science, process and analysis. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1648.silicon-2020/354-357.

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Work describes four permutation algorithms of square matrices based on cyclic rows and columns shifts. This choice of discrete transformation algorithms is justified by the convenience of the cellular automaton (CA) formulation. Output matrices can be considered as pseudo-random sequences of numbers. As a result of numerical calculation, empirical formulas are obtained for the permutation period and the function of the period of a single CA-cell on the order of the matrix n. As a parameter of CA dynamics, we analyze two "mixing metrics" on permutations of the matrix (compared to the initial matrix).
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Reports on the topic "Cyclic matrice"

1

Kinikles, Dellena, and John McCartney. Hyperbolic Hydro-mechanical Model for Seismic Compression Prediction of Unsaturated Soils in the Funicular Regime. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2022. http://dx.doi.org/10.55461/yunw7668.

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A semi-empirical elasto-plastic constitutive model with a hyperbolic stress-strain curve was developed with the goal of predicting the seismic compression of unsaturated sands in the funicular regime of the soil-water retention curve (SWRC) during undrained cyclic shearing. Using a flow rule derived from energy considerations, the evolution in plastic volumetric strain (seismic compression) was predicted from the plastic shear strains of the hysteretic hyperbolic stress-strain curve. The plastic volumetric strains are used to predict the changes in degree of saturation from phase relationships and changes in pore air pressure from Boyle’s and Henry’s laws. The degree of saturation was used to estimate changes in matric suction from the transient scanning paths of the SWRC. Changes in small-strain shear modulus estimated from changes in mean effective stress computed from the constant total stress and changes in pore air pressure, degree of saturation and matric suction, in turn affect the hyperbolic stress-strain curve’s shape and the evolution in plastic volumetric strain. The model was calibrated using experimental shear stress-strain backbone curves from drained cyclic simple shear tests and transient SWRC scanning path measurements from undrained cyclic simple shear tests. Then the model predictions were validated using experimental data from undrained cyclic simple shear tests on unsaturated sand specimens with different initial degrees of saturation in the funicular regime. While the model captured the coupled evolution in hydro-mechanical variables (pore air pressure, pore water pressure, matric suction, degree of saturation, volumetric strain, effective stress, shear modulus) well over the first 15 cycles of shearing, the predictions were less accurate after continued cyclic shearing up to 200 cycles. After large numbers of cycles of undrained shearing, a linear decreasing trend between seismic compression and initial degree of saturation was predicted from the model while a nonlinear increasing-decreasing trend was observed in the cyclic simple shear experiments. This discrepancy may be due to not considering post shearing reconsolidation in the model, calibration of model parameters, or experimental issues including a drift in the position of the hysteretic shear-stress strain curve. Nonetheless, the trend from the model is consistent with predictions from previously- developed empirical models in the funicular regime of the SWRC. The developments of the new mechanistic model developed in this study will play a key role in the future development of a holistic model for predicting the seismic compression across all regimes of the SWRC.
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Carrigee, Lyndsay, Carina Jung, Matthew Carr, and Karl Indest. Bacterial remediation of microsystin-HAB toxins utilizing microcystinase (MlrA). Engineer Research and Development Center (U.S.), 2025. https://doi.org/10.21079/11681/49673.

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Microcystins are a class of hepatotoxins produced by some harmful algal bloom–associated cyanobacteria and are the most reported toxins in freshwaters. Their cyclic structure makes them resistant to conventional methods used in water treatment operations (boiling, chlorination, and UV treatment). Some bacteria can naturally degrade microcystins via the mlrABCD cluster, a pathway initiated by the primary enzyme microcystinase (MlrA). MlrA linearizes the cyclic microcystin, greatly reducing its toxicity. Protein fusion was employed to produce a recombinant MlrA enzyme fused to maltose-binding protein ([MBP] MBP-MlrA) and to evaluate long-term enzymatic stabilization and reconstitution for future applications. MBP-MlrA degraded cyclic microcystin in vitro and demonstrated stability across a range of biological pHs. At a concentration of 0.61 ng/μl in buffer, MBP-MlrA achieved and maintained an average degradation rate of approximately 101.95 μM/h/ng of protein across fifteen freeze/thaw cycles. Stability assays demonstrated that enzyme activity was preserved over 5 months at −20°C. Results also demonstrated the effectiveness of MBP-MlrA to linearize microcystin upwards of 55.59 μM/h/ng of protein at the bench scale in both buffer and various freshwater matrices. The presence of the linear metabolite is of concern regarding intermediate toxicity, and future studies to incorporate the MlrB peptidase are discussed.
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Maydykovskiy, Igor. Consciousness as a new form of the matter’s state. Intellectual Archive, 2021. http://dx.doi.org/10.32370/iaj.2555.

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The article discusses the physical model of the implicative form of Consciousness in the form of a holographic wave matrix, for which the material basis is directly the phase environment that fills the entire Space. It is shown that a similar form of Consciousness that exists outside the human brain can be represented as a kind of software shell that controls all forms of matter by implementing a fractal cyclic iterative algorithm. The condition for the completion of each iterative cycle at each scale level is the observance of the laws of symmetry that ensure the survival of the object in the process of copying-incarnation.
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White, Kenneth W. Modeling of Failure in Monolithic and Ceramic Matrix Composite Under Static and Cyclic Loading. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada430835.

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Taya, M., M. S. Lui, W. D. Armstrong, and M. L. Dunn. Damage Accumulation in Advanced Metal Matrix Composites Under Thermal Cycling/Creep Loadings. Defense Technical Information Center, 1993. http://dx.doi.org/10.21236/ada271207.

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Morrison, Jay. Ceramic Matrix Composite Advanced Transition for 65% Combined Cycle Efficiency Turbines - Final Report. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1492685.

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Schijman, Agustina. Evaluation of the Results of the Realignment Background Paper: Composition and Dynamics of Project Teams at the IDB: Analysis of staff Fragmentation. Inter-American Development Bank, 2014. http://dx.doi.org/10.18235/0009272.

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In 2006, the Board of Governors of the Inter-American Development Bank (IDB,or the Bank) authorized a major restructuring of the Bank (the "Realignment") to address the perceived loss of relevance and presence of the institution in Latin America and the Caribbean (LAC). The Realignment introduced a number of reforms, including a new organizational structure (the Matrix Structure), a revised process for project design and execution (the New Project Cycle), and the renewal of human resource skills and decentralization of personnel. Paper assesses the main changes in the composition and dynamics of IDB project teams throughout the life of loan operations, with a special emphasis on staff fragmentation between design and execution.
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8

Shpigel, Muki, Allen Place, William Koven, Oded (Odi) Zmora, Sheenan Harpaz, and Mordechai Harel. Development of Sodium Alginate Encapsulation of Diatom Concentrates as a Nutrient Delivery System to Enhance Growth and Survival of Post-Larvae Abalone. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7586480.bard.

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The major bottlenecks in rearing the highly priced gastropod abalone (Haliotis spp.) are the slow growth rate and the high mortality during the first 8 to 12 weeks following metamorphosis and settling. The most likely reason flor these problems is related to nutritional deficiencies in the diatom diet on which the post larvae (PL) feed almost exclusively in captivity. Higher survival and improved growth rate will reduce the considerable expense of hatchery-nursery resisdence time and thereflore the production costs. BARD supported our research for one year only and the support was given to us in order to prove that "(1) Abalone PL feed on encapsulated diatoms, and (2) heterotrophic diatoms can be mass produced." In the course of this year we have developed a novel nutrient delivery system specifically designed to enhance growth and survival of post-larval abalone. This approach is based on the sodium-alginate encapsulation of heterotrophically grown diatoms or diatom extracts, including appetite-stimulating factors. Diatom species that attract the PL and promote the highest growth and survival have been identified. These were also tested by incorporating them (either intact cells or as cell extracts) into a sodium-alginate matrix while comparing the growth to that achieved when using diatoms (singel sp. or as a mixture). A number of potential chemoattractants to act as appetite-stimulating factors for abalone PL have been tested. Preliminary results show that the incorporation of the amino acid methionine at a level of 10-3M to the sodim alginate matrix leads to a marked enhancement of growth. The results ol these studies provided basic knowledge on the growth of abalone and showed that it is possible to obtain, on a regular basis, survival rates exceeding 10% for this stage. Prior to this study the survival rates ranged between 2-4%, less than half of the values achieved today. Several diatom species originated from the National Center for Mariculture (Nitzchia laevis, Navicula lenzi, Amphora T3, and Navicula tennerima) and Cylindrotheca fusiformis (2083, 2084, 2085, 2086 and 2087 UTEX strains, Austin TX) were tested for heterotrophic growth. Axenic colonies were initially obtained and following intensive selection cycles and mutagenesis treatments, Amphora T3, Navicula tennerima and Cylindrotheca fusiformis (2083 UTEX strain) were capable of growing under heterotrophic conditions and to sustain highly enriched mediums. A highly efficient selection procedure as well as cost effective matrix of media components were developed and optimized. Glucose was identified as the best carbon source for all diatom strains. Doubling times ranging from 20-40 h were observed, and stable heterotroph cultures at a densities range of 103-104 were achieved. Although current growth rates are not yet sufficient for full economical fermentation, we estimate that further selections and mutagenesis treatments cycles should result in much faster growing colonies suitable for a fermentor scale-up. As rightfully pointed out by one of the reviewers, "There would be no point in assessing the optimum levels of dietary inclusions into micro-capsules, if the post-larvae cannot be induced to consume those capsules in the first place." We believe that the results of the first year of research provide a foundationfor the continuation of this research following the objectives put forth in the original proposal. Future work should concentrate on the optimization of incorporation of intact cells and cell extracts of the developed heterotrophic strains in the alginate matrix, as well as improving this delivery system by including liposomes and chemoattractants to ensure food consumption and enhanced growth.
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Tarasova, Anna, Deven Kanakamedala, Jungil Seo, Amit H. Varma, and Robert J. Connor. New Repair Strategies for Life-Cycle Extension of Corroded Steel Girder Bridges. Purdue University, 2025. https://doi.org/10.5703/1288284317748.

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Steel girder ends are susceptible to corrosion damage due to deicing salts, water, and other contaminants leaking from failed expansion joints. When corrosion becomes significant, it leads to a reduction in the sectional properties of steel girders and consequently reduces bearing and shear resistance. Conventional repair methods, although effective, require substantial time and resources to complete, causing public inconvenience from necessary traffic closures. Therefore, there is a need for practical, rapid, and robust repair methods suitable for implementation by local Department of Transportation (DOT) maintenance personnel. In this study, five innovative repair methods were systematically evaluated through a selection process called the House of Quality Matrix. After completing the comprehensive evaluation and additional numerical simulations, the "sandwich panel" repair method was selected for further investigation. The "sandwich panel" repair method encased the corroded region with a filler material reinforced by threaded rods. Two thin steel plates installed on both girder sides served as stay-in-place formwork. This expedited the installation process and eliminated the labor-intensive steps of jacking, welding, and formwork disassembly, thus making the repair more cost-effective and less time-consuming. The structural performance of the repair method was evaluated experimentally by conducting seven large-scale tests. Various test parameters were considered in the tests, including (1) threaded rod layout, (2) filler material, and (3) support condition. The experimental results indicated that the method was effective in restoring their original design strength. A parametric study complemented the experimental evaluation, using the finite element models benchmarked with experimental results. Design guidelines and recommendations were developed based on the experimental and numerical results.
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Rodrigo, Maria Fernanda, Claudia Figueroa, Oliver Peña-Habib, Xiomara Rojas-Asqui, and Melanie Putic. OVE's Review of Project Completion Reports (PCRs) and Expanded Supervision Reports (XSRs): The 2020 Validation Cycle. Inter-American Development Bank, 2020. http://dx.doi.org/10.18235/0002944.

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This report summarizes the results of the Office of Evaluation and Oversight's (OVE) annual validation of the self-assessments of project performance and results completed by the Inter-American Development Bank (IDB) and IDB Invest in 2019-2020. The IDB and IDB Invest have systems in place to measure the development effectiveness of their operations. These systems use a number of instruments to assess projects at the design, implementation, and completion phases. The design-phase assessment uses a “Development Effectiveness Matrix” (DEM) for sovereign guaranteed (SG) operations. The effectiveness of non-sovereign guaranteed (NSG) operations is measured with a “Development Effectiveness Learning, Tracking, and Assessment tool” (DELTA). Implementation-phase assessments measure SG operations with “Project Monitoring Reports,” while NSG operations are assessed with “Project Supervision Reports.” Upon completion, SG projects are self-evaluated with “Project Completion Reports,” or PCRs. NSG operations, use “Expanded Supervision Reports,” or XSRs when they reach early operation maturity (EOM). OVE validates Managements self-evaluations (PCRs and XSRs) and assigns a final project performance rating to each operation. As part of the 2020 validation cycle, OVE reviewed PCRs for 63 operations, 62 with operational closure (CO fully justified) in 2018 and one in 2013. XSRs were reviewed for 36 IDB Invest operations that had reached early operating maturity (EOM) in 2018.
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