Gotowe bibliografie tematyczne / Dislocation

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  2. Rozprawy doktorskie
  3. Książki
  4. Części książek
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Gotowa bibliografia na temat „Dislocation”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 29 lipca 2024

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Artykuły w czasopismach na temat "Dislocation"

1

Shetty, Sanath Kumar, Lawrence J. Mathias, H. Ravindranath Rai, P. Nirmal Babu, Raj Sankar N. R. i Vinay Kumar C. "SIMULTANEOUS BILATERAL ANTERIOR DISLOCATION OF THE SHOULDER WITH FRACTURES OF THE GREATER TUBEROSITY FOLLOWING TRAUMA- A CASE REPORT". Journal of Health and Allied Sciences NU 04, nr 01 (marzec 2014): 129–30. http://dx.doi.org/10.1055/s-0040-1703750.

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Abstract:Simultaneous bilateral shoulder dislocations are usually posterior with anterior dislocations1 being rare and simultaneous anterior shoulder dislocations with fractures of the greater tuberosity5 being even more rare usually associated with trauma or seizures2,3 . Here we present a rare case of simultaneous bilateral anterior dislocation of the shoulder with fractures of the greater tuberosity following an unusual injury mechanism which was treated surgically.
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Pande, Chandra S., i Ramasis Goswami. "Dislocation Emission and Crack Dislocation Interactions". Metals 10, nr 4 (3.04.2020): 473. http://dx.doi.org/10.3390/met10040473.

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An understanding of the crack initiation and crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge. It is known that dislocations are involved both in the initiation and propagation of cracks in metals and alloys. In this review, we first describe the experimental observations of dislocation emission from cracks under stress. Then the role played by these dislocations in fatigue and fracture is considered at a fundamental level by considering the interactions of crack and dislocations emitted from the crack. We obtain precise expression for the equilibrium positions of dislocations in an array ahead of crack tip. We estimate important parameters, such as plastic zone size, dislocation free zone and dislocation stress intensity factor for the analysis of crack propagation. Finally, we describe very recent novel and significant results, such as residual stresses and relatively large lattice rotations across a number of grains in front of the crack that accompanies fatigue process.
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Gulbrandsen, Matthew T., Jill G. Putnam, J. Tracy Watson i Michael D. McKee. "Irreducible Volar DRUJ Dislocation with Distal Radius Fracture Dislocation". Journal of Wrist Surgery 09, nr 02 (12.07.2019): 156–59. http://dx.doi.org/10.1055/s-0039-1692476.

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Abstract Background Volar dislocations of the distal radioulnar joint (DRUJ) are rare and often missed during initial evaluation. Chronic dislocations and disability can occur when DRUJ dislocations are unrecognized and not reduced. DRUJ dislocations often occur with other wrist injuries, which may complicate reduction. Closed reduction can fail to reduce DRUJ dislocations, in which case open reduction is necessary. Case Description This case describes a patient who had a volar dislocation of the DRUJ with an associated dorsal distal radius fracture dislocation. Initial attempts at closed reduction were unsuccessful which prompted surgical intervention. After open reduction and internal fixation of the distal radius fracture dislocation, closed reduction of the DRUJ remained unsuccessful. This prompted an open reduction of the DRUJ. Surgical exposure demonstrated that the extensor carpi ulnaris and the distal radius had prevented closed reduction of the DRUJ. Postoperatively, a splint was placed with the wrist in supination. The patient followed-up at the 2- and 4-month intervals with persistent subluxation. However, the patient also reported minimal pain and the ability to return to work and previous level of activity. Literature Review Current literature regarding irreducible volar DRUJ dislocations with distal radius fracture dislocations includes sparse case reports, which are reviewed in this report. Clinical Relevance This case illustrates successful treatment for an uncommon volar DRUJ dislocation associated with a dorsal distal radius fracture dislocation and can be utilized to help guide future treatment of similar complex cases.
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Wang, Xiaona, Haibin Zhang, Shinong Yan, Yongmei Zhang, Xiaolin Tian, Dunwei Peng i Yuhong Zhao. "The Response Mechanism of Crystal Orientation to Grain Boundary Dislocation under Uniaxial Strain: A Phase-Field-Crystal Study". Metals 12, nr 5 (21.04.2022): 712. http://dx.doi.org/10.3390/met12050712.

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An exploration of dislocation microstructure evolution with different misorientation angles was performed using phase field crystal method (PFC). The microcosmic evolution process of grain boundaries under external stress, as well as the corresponding energy curve and stress–strain curve, are analyzed. The relationship between the misorientation angle and the dislocations emission frequency is discussed. Three forms of dislocations reaction on the evolution process of 6°and 10° are analyzed in detail, which are respectively type I semi-annihilation, type II semi-annihilationand full-annihilation. Among them, the nature of type I semi-annihilation is a combination of dislocation and a single edge dislocation reaction with a single edge dislocation left. The essence of type II semi-annihilation is a pair of dislocation and the other pair of dislocation reaction leaving two edge dislocations. The essence of full-annihilation is that two pairs of dislocations or single edge dislocations with opposite Burger vectors react with each other and the distortion area disappears. When the misorientation angle is 10°, the dislocation reaction and the dislocation motion ability of the system are stronger than 6°. The peak of the energy curve is related to the number of dislocation proliferations in the evolution process. An emission frequency and average density of dislocations of 10° is greater than 6°. The causes of plastic deformation are revealed to a certain extent by stress–strain curves.
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Petelina, Yulia, Svetlana Kolupaeva, Konstantin A. Polosukhin i Aleksander Petelin. "Influence of the Dislocation Density on the Expansion Dynamics of the Crystallographic Slip Zone along Screw Orientations in Aluminum and Copper". Key Engineering Materials 683 (luty 2016): 136–41. http://dx.doi.org/10.4028/www.scientific.net/kem.683.136.

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Crystallographic slip is one of key mechanisms determining plastic form change of crystalline solids. Despite a large amount of works done on the subject, crystallographic slip is a very difficult subject to study. Significant progress in the study of the crystallographic slip process is possible only with the use of a set of different methods: experimental methods, methods of mathematical modeling and simulation. The paper presents a modification mathematical expansion model of closed dislocations emitted by one dislocation source with takes into account the elastic interaction force among all dislocations of the forming dislocation pile-up. The model takes into account the Peach-Koehler forces, lattice, impurity, and dislocation friction, linear tension, viscous deceleration, and the intensity of generation of point defects beyond jogs on the dislocation, as well as the elastic interaction force among all dislocations of the forming dislocation pile-up. The analysis of the study results on the expansion dynamics of the dislocation loop along the screw orientation on copper and aluminum with varying of the dislocation density from 3×1011 m−2 to 1012 m−2 is carried out. It is established that the length and the path time of the screw dislocation, as well as the number of dislocations emitted by the dislocation source, essentially depend on the density of dislocations. The dependence of the current radius, velocity, and kinetic energy of the screw dislocation on the path time and the dependence of the current velocity and the kinetic energy of the first screw dislocation emitted by the dislocation source on its current radius are described.
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Li, Yon Gan, Xiang Qian Xiu, Xue Mei Hua, Shi Ying Zhang, Shi Pu Gu, Rong Zhang, Zi Li Xie i in. "Study of Dislocation Densities of Thick GaN Films". Advanced Materials Research 989-994 (lipiec 2014): 387–90. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.387.

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The dislocation density of GaN thick films has been measured by high-resolution X-ray diffraction. The results show that both the edge dislocations and the screw dislocation reduce with increasing the GaN thickness. And the edge dislocations have a larger fraction of the total dislocation densities, and the densities for the edge dislocation with increasing thickness reduce less in contrast with those for the screw dislocation.
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7

Takaki, Setsuo, Y. Fujimura, Koichi Nakashima i Toshihiro Tsuchiyama. "Effect of Dislocation Distribution on the Yielding of Highly Dislocated Iron". Materials Science Forum 539-543 (marzec 2007): 228–33. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.228.

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Yield strength of highly dislocated metals is known to be directly proportional to the square root of dislocation density (ρ), so called Bailey-Hirsch relationship. In general, the microstructure of heavily cold worked iron is characterized by cellar tangled dislocations. On the other hand, the dislocation substructure of martensite is characterized by randomly distributed dislocations although it has almost same or higher dislocation density in comparison with heavily cold worked iron. In this paper, yielding behavior of ultra low carbon martensite (Fe-18%Ni alloy) was discussed in connection with microstructural change during cold working. Originally, the elastic proportional limit and 0.2% proof stress is low in as-quenched martensite in spite of its high dislocation density. Small amount of cold rolling results in the decrease of dislocation density from 6.8x1015/m-2 to 3.4x1015/m-2 but both the elastic proportional limit and 0.2% proof stress are markedly increased by contraries. 0.2% proof stress of cold-rolled martensite could be plotted on the extended line of the Bailey-Hirsch equation obtained in cold-rolled iron. It was also confirmed that small amount of cold rolling causes a clear microstructural change from randomly distributed dislocations to cellar tangled dislocations. Martensite contains two types of dislocations; statistically stored dislocation (SS-dislocation) and geometrically necessary dislocation (GN-dislocation). In the early deformation stage, SS-dislocations easily disappear through the dislocation interaction and movement to grain boundaries or surface. This process produces a plastic strain and lowers the elastic proportional limit and 0.2% proof stress in the ultra low carbon martensite.
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Lauer, Kevin, Martin Herms, Anett Grochocki i Joachim Bollmann. "Iron Gettering at Slip Dislocations in Czochralski Silicon". Solid State Phenomena 178-179 (sierpień 2011): 211–16. http://dx.doi.org/10.4028/www.scientific.net/ssp.178-179.211.

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The impact of slip dislocations on the interstitial iron distribution in as-grown CZ silicon wafers is investigated by calibrated MWPCD excess charge carrier lifetime measurements, DLTS measurements and measurements of the dislocation density. In regions of high dislocation density low interstitial iron content as well as low lifetime is observed. A linear correlation between dislocation density and interstitial iron content is found. We explain this linear correlation by the thesis that slip dislocations are 60° dislocations, which have adsorbed one iron atom at each dangling bond along the dislocation axis. Interstitial iron is gettered by slip dislocations but iron silicide, which forms along the dislocation axis, is a very strong recombination center for excess charge carriers as well. Hence, gettering of interstitial iron at slip dislocations does not increase the electrical quality of silicon.
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Shen, Yixi, i Douglas E. Spearot. "Mobility of dislocations in FeNiCrCoCu high entropy alloys". Modelling and Simulation in Materials Science and Engineering 29, nr 8 (15.11.2021): 085017. http://dx.doi.org/10.1088/1361-651x/ac336a.

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Abstract Dislocations in high entropy alloys (HEAs) are wavy and have natural pinning points due to the variable chemical and energetic landscape surrounding the dislocation core. This can influence the critical shear stress necessary to initiate dislocation motion and the details associated with sustained dislocation glide. The objective of this work is to determine the relationship between Schmid shear stress and dislocation velocity in single phase FCC FeNiCrCoCu HEAs using molecular dynamics simulations, with comparisons made to dislocation motion in homogeneous Ni and Cu. Simulations are performed for four different dislocation character angles: 0° (screw), 30°, 60° and 90° (edge). Several key differences are reported, compared to what is previously known about dislocation motion in homogeneous FCC metals. For example, the drag coefficient B in the phonon damping regime for HEAs has a nonlinear dependence on temperature, whereas this dependence is linear in Ni. Mobility relationships between different types of dislocations common in homogeneous FCC metals, such as the velocity of screw and 60° dislocations being lower than edge and 30° dislocations at the same shear stress, do not necessarily hold in HEAs. Dislocation waviness is measured and is found to correlate with the ability of dislocations to glide under an applied shear stress, including the temperature dependence of the drag coefficient B. These results confirm that the influence of HEA chemical complexity on dislocation motion is important and this data can be used to guide development of analytical or empirical models for dislocation mobility in HEAs.
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Kang, Junyong, Shin Tsunekawa i Atsuo Kasuya. "Dislocations around precipitates in AlGaN epilayers". Journal of Materials Research 17, nr 8 (sierpień 2002): 2007–11. http://dx.doi.org/10.1557/jmr.2002.0297.

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Dislocations around precipitates in undoped AlGaN were investigated by transmission electron microscopy. The dislocation images were taken under different diffraction conditions. The dislocations are classified into two types, a pure edge dislocation loop and a close-;coiled helical dislocation. Both types of dislocations were found to depend on the shape and size of the precipitate sources. It is suggested that the pure edge dislocation loop results from homogeneous shear stress and the close-;coiled helical dislocation is caused by spherically symmetrical stress concentration at round ends of the precipitates and chemical force due to defect concentration change.
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Rozprawy doktorskie na temat "Dislocation"

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De, Cat Cécile. "French dislocation". Thesis, University of York, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270049.

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Abu, Ashekh Malek. "Joint dislocation". Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/36575.

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A joint dislocation, or luxation occurs when there is an abnormal separation in the joint, where two or more bones meet. A partial dislocation is referred to as a subluxation. Dislocations are often caused by sudden trauma on the joint like an impact or fall. A joint dislocation can cause damage to the surrounding ligaments, tendons, muscles, and nerves Dislocations can occur in any joint major (shoulder, knees, etc.) or minor (toes, fingers, etc.). The most common joint dislocation is a shoulder dislocation. Symptoms: intense pain, joint instability, deformity of the joint area, reduced muscle strength, bruising or redness of joint area, difficulty moving joint. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/36575
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Lamie, Philip Wayne. "Modern dislocation". The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1300208224.

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Shin, Chansun. "3D discrete dislocation dynamics applied to dislocation-precipitate interactions". Grenoble INPG, 2004. http://www.theses.fr/2004INPG0116.

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La dynamique des dislocations discrètes (DDD) a été appliquée pour examiner les effets des précipités sur la plasticité des monocristaux de structure CFC. Les précipités sont modélisés par un assemblage de facettes franchissable pour une contrainte donnée. Afin de tenir compte des interactions élastiques entre les dislocations et les particules, un couplage avec la méthode des éléments finis (MEF) a été utilisé. Afin d'accélérer les temps de calculs, la 'méthode des boites' a été revisitée et une version parallèle du code a été développée en utilisant le standard du programmation 'Message Passing Interface (MPI)'. Dans un premier temps, les contraintes images créées par une particule 3D ont été calculées grâce un couplage entre la MEF et le code de DDD. Les résultats numériques ont été comparés aux solutions analytiques correspondantes. L'effet de la différence des modules d'Young sur la limite élastique et le comportement durcissant qui en découle ont ensuite été étudiés numériquement. Nous avons montré que les contraintes image ont un effet significatif sur le durcissement et les événements locaux tels que le glissement dévié et la montée. Finalement, la fatigue des matériaux durcis par des précipités cisaillables et non-cisaillables a été simulée avec le nouveau code parallèle de DDD. Les résultats obtenus grâce à nos simulations sont en accord avec nos observations experimentales et les données de la littérature. Un mécanisme de formation des bandes de glissement intense a été proposé à partir de l'observation des microstructures obtenues par simulation
The 3D Discrete Dislocation Dynamics (DDD) method has been applied to investigate the effects of precipitates on the plasticity of FCC single crystals. A method to represent the internal interfaces by a series of facets with a pre-defined strength has been proposed. For a full account of the mutual elastic interactions between dislocations and second-phase particles, the coupling method with a finite element method is extended. In order to accelerate the computing time, the serial 3D DDD algorithm has been improved by revisiting the 'box method' and a new parallel code has been developed using the standard Message passing Interface (MPI). The image stresses due to a three-dimensional particle were computed using the FEM/DDD coupling code. The numerical results have been compared to the corresponding analytical solutions. The effect of the elastic modulus mismatch on the flow stress and the subsequent hardening behavior has then been analyzed. The image stresses were found to affect significantly the work hardening and the local events such as cross slip and climb. Finally, the fatigue of precipitate-hardened materials was simulated using the new parallel DDD code. The effects of shearable and non-shearable particles on the fatigue properties were well reproduced by the simulations, and the numerical results showed good agreements with the available experimental observations in a qualitative way. The mechanism of the intense slip band formation is proposed from the observation of the simulated dislocation microstructure
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Garg, Akanksha. "Homogeneous Dislocation Nucleation". Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/401.

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Tighe, Stephen Patrick. "Macroscopic dislocation modelling". Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:e4f00d59-71b0-43c0-b141-0bb7e6108fff.

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Work-hardened metals typically possess large numbers of dislocations in complex three-dimensional configurations about which little is known theoretically. Here these large numbers of dislocations are accounted for by means of a dislocation density tensor, which is obtained by applying an averaging process to families of discrete dislocations. Some simple continuous distributions are examined and an analogy is drawn with solenoids in electromagnetism before the question of the equilibrium of dislocation configurations is studied. It is then proved that the only finite, simply-connected distribution of dislocations in equilibrium in the absence of applied stresses are ones in which all components of stress vanish everywhere. Some examples of these zero stress everywhere (ZSE) distributions are then given, and the concept of 'plastic distortion' is used to facilitate their interpretation as rotations of the crystal lattice. Plastic distortion can also be understood as a distribution of infinitesimal dislocation loops ('Kroupa loops'), and this idea is used in Chapter 4 to investigate the dislocation distributions which correspond to elastic inclusions. The evolution, under an applied stress, of some simple ZSEs is analysed, and the idea of 'polarisation' is introduced, again in analogy with electromagnetism. Finally, a mechanism is conjectured for the onset of plastic flow.
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Crenshaw, Mary. "Dislocation and materiality". Thesis, University of East London, 2018. http://roar.uel.ac.uk/7885/.

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Dislocation, and Materiality is the culmination my three years of research into artists and theorists, whose work provided me with a clearer direction in my practice as a painter. My research has enabled me to become more aware of the reasons for my current approach to painting that includes: relying on my physical energy, the inherent properties in the material/paint, defining space, memory of place that suggests urban landscape and its inhabitants. The theories of Georges Bataille on the mark, François Jullien on the Chinese concept of lifeforce, and Theodor Adorno on how dissonance is central to artistic and aesthetic process have fed the development of my creative practice. The key artists I researched -Anselm Kiefer, Julie Mehretu, Fabienne Verdier, Mark Bradford, and Phyllida Barlow - provided me with new concepts to introduce in my own work. Mehretu's paintings supplied me with the solution for incorporating political content by means of suggestive titles and expressive marking over imagery. Kiefer's rich assortment of media led me to understand how materials contribute to the meaning of a work. Verdier's gesture and physical energy encouraged me to let go of control and embrace expressionistic paint application. How Mark Bradford uses found brochures and posters from his neighbourhood, transforming them into material for his work gave me the insight that meaning can be in the actual materials. Phyllida Barlow's dynamic works made me consider how the different kinds of marks I create carry vitality and ideas communicated by the material properties of the paint.
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Bicknell, Louise Susan, i n/a. "Genetic contributors to congenital joint dislocation". University of Otago. Dunedin School of Medicine, 2007. http://adt.otago.ac.nz./public/adt-NZDU20080211.151359.

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Understanding the molecular basis of Mendelian disorders featuring joint dislocation can enhance the knowledge of genetic or cellular pathways required in joint development, and provide candidate genes for studying related complex disorders, such as developmental dysplasia of the hip. Two strategies were employed in this project to investigate Mendelian contributors to congenital joint dislocation. The first strategy was to investigate in-depth a gene known to be associated with joint dislocation. Missense mutations or small in-frame deletions in FLNB, encoding filamin B, have previously been associated with a spectrum of osteochondrodysplasias. Screening a larger cohort established FLNB as the sole underlying disease gene for atelosteogenesis type I and III and also boomerang dysplasia, which was previously thought clinically to be allelic to AOI. Mutations in FLNB cause a large proportion of Larsen syndrome cases with phenotypes reminiscent of the early case series reported. Atypical or "recessive" Larsen syndrome may therefore be due to a different underlying genetic aberration. The disease-associated amino acid substitutions or in-frame deletion/insertions cluster to two main regions of the filamin B protein: the calponin homology 2 domain of the actin-binding domain, and repeats 13-17 of the rod domain. To analyse the functions of these regions, yeast two-hybrid analyses were performed. No interactors were identified with the calponin homology 2 domain, which suggests the amino acid substitutions may disrupt actin binding or the regulation thereof. A candidate interactor, centromere protein J, was identified that binds to repeats 13-15, and could suggest a model for aberrant cell division seen in growth plates of bones of individuals with atelosteogenesis types I and III and boomerang dysplasia. The second strategy used in this project was to investigate the genetic cause of a novel syndrome featuring joint dislocation. A neurocutaneous phenotype segregated in a consanguineous New Zealand family, and through a genetic mapping strategy, a significantly linked locus was identified at 10q23 (Z = 3.63), in which segregation of a common ancestral haplotype fits the linkage hypothesis of homozygosity by descent. Candidate gene analysis and subsequent screening identified a missense mutation 2350C>T in ALDH18A1, which predicts the substitution H784Y in the encoded protein [Delta]�-pyrroline-5-carboxylate synthase (P5CS). The known function of P5CS in proline and ornithine biosynthesis was not affected by the presence of H784Y in an indirect assay, and therefore the hypothesis proposed was that a novel, unknown moonlighting function of P5CS is perturbed causing the phenotype segregating in the family. As an initial exploration of functions of P5CS in the cell, yeast two-hybrid analysis was undertaken. This project examined the contribution of two genes, FLNB and ALDH18A1, to Mendelian congenital joint dislocations. How the cellular functions of the encoded proteins in the cytoskeleton, metabolism, or signal transduction, are critical for joint development is ill understood. Future investigations aimed at identifying candidate genes that confer susceptibility to developmental dysplasia of the hip should consider candidate genes that encode proteins related in function to the products of the FLNB and ALDH18A1 genes.
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Chen, Qian. "Evolution, interaction, and intrinsic properties of dislocations in intermetallics anisotropic 3D dislocation dynamics approach /". [Ames, Iowa : Iowa State University], 2008.

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Ruggles, Tim. "Characterization of Geometrically Necessary Dislocation Content with EBSD-Based Continuum Dislocation Microscopy". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/4392.

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Modeling of plasticity is often hampered by the difficulty in accurately characterizing dislocationdensity on the microscale for real samples. It is particularly difficult to resolve measureddislocation content onto individual dislocation systems at the length scales most commonly of interestin plasticity studies. Traditionally, dislocation content is analyzed at the continuum levelusing the Nye tensor and the fundamental relation of continuum dislocation theory to interpret informationmeasured by diffraction techniques, typically EBSD or High Resolution EBSD. In thiswork the established Nye-Kroner method for resolving measured geometrically necessary dislocationcontent onto individual slip systems is assessed and extended. Two new methods are alsopresented to relieve the ambiguity of the Nye-Kroner method. One of these methods uses modifiedclassical dislocation equations to bypass the Nye-Kroner relation, and the other estimates the bulkdislocation density via the entry-wise one-norm of the Nye tensor. These methods are validatedvia a novel simulation of distortion fields around continuum fields of dislocation density based onclassical lattice mechanics and then applied to actual HR-EBSD scans of a micro-indented singlecrystals of nickel and tantalum. Finally, a detailed analysis of the effect of the spacing betweenpoints in an EBSD scan (which is related to the step size of the numerical derivatives used in EBSDdislocation microscopy) on geometrically necessary dislocation measurements is conducted.
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Książki na temat "Dislocation"

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Kazmaier, Peter. The Halcyon dislocation. Mississauga, Ont: Wolfsburg Imprints, 2009.

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R, Weertman Julia, red. Elementary dislocation theory. New York: Oxford University Press, 1992.

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Nabarro, F. R. N. 1916-, red. Dislocation in solids. Amsterdam: North-Holland, 1992.

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Anagnostopoulou, Elena, Henk van Riemsdijk i Frans Zwarts, red. Materials on Left Dislocation. Amsterdam: John Benjamins Publishing Company, 1997. http://dx.doi.org/10.1075/la.14.

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Suzuki, Taira, Shin Takeuchi i Hideo Yoshinaga. Dislocation Dynamics and Plasticity. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75774-7.

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Fressengeas, Claude. Mechanics of Dislocation Fields. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118578285.

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Suzuki, Taira. Dislocation dynamics and plasticity. Berlin: Springer-Verlag, 1991.

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Suzuki, Taira. Dislocation Dynamics and Plasticity. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991.

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Elena, Anagnostopoulou, Riemsdijk Henk van i Zwarts Frans, red. Materials on left dislocation. Amsterdam: J.Benjamins,Netherlands, 1997.

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Demir, Ismail. The Somigliana ring dislocation. Pullman, Wash: Dept. of Mechanical and Materials Engineering, Washington State University, 1990.

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Części książek na temat "Dislocation"

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Ohmura, Takahito. "Nanomechanical Characterization of Metallic Materials". W The Plaston Concept, 157–95. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7715-1_8.

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AbstractMechanical behavior of metallic materials on nanoscale is characterized by using Nanoindentation and Transmission Electron Microscope (TEM) to understand the fundamental plasticity mechanisms associated with microstructural factors including dislocations. The advanced characterization techniques enable us to grasp the behavior on the nanoscale in detail. New knowledges are obtained for the plasticity initiation under the extremely high stress close to the theoretical strength in regions with defect-free matrix and pre-existing defects such as grain boundaries, in-solution elements, and dislocations. The grain boundaries act as an effective dislocation source, the in-solution elements retard a nucleation of dislocation, and the pre-existing dislocations assist a plasticity initiation. The deformation behavior associated with microstructures is also described. The dislocation structure with a certain density was observed right after indentation-induced strain burst, which is so-called “pop-in,” suggesting a dislocation avalanche upon the pop-in. It has been directly observed that the lower mobility screw dislocation causes the higher flow stress in a bcc metal. A remarkable strain softening can be understood by an increase in dislocation density based on conventional physical models. Phase stability for indentation-induced transformation depends on a constraint effect by inter-phase boundary and grain boundary.
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Tsuru, Tomohito. "Descriptions of Dislocation via First Principles Calculations". W The Plaston Concept, 91–115. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7715-1_5.

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AbstractDislocation is one of the most representative plastons to determine the mechanical properties of crystalline materials. In this section, several computational approaches for of dislocations and dislocation-related properties are introduced within the framework of first principles calculations. The staking fault energy corresponding to the local interfacial misfit energy is one of the most important characteristics to determine the shape and motion of dislocations. The first principles calculations of the staking fault energy on various slip planes in HCP metals are provided compared with several materials. Peierls–Nabarro model is then introduced to describe the shape and motion of the dislocation. Finally, atomic configuration of a dislocation dipole in a periodic cell can be modeled based on the linear elasticity theory. First principles calculations are thus directly applied to dislocation core structure which enable us to evaluate the effect of solute element on the dislocation core structure and motion.
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Wroblewski, B. M., Paul D. Siney i Patricia A. Fleming. "Dislocation". W Charnley Low-Frictional Torque Arthroplasty of the Hip, 133–37. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21320-0_16.

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Gooch, Jan W. "Dislocation". W Encyclopedic Dictionary of Polymers, 235. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3831.

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Wroblewski, B. M. "Dislocation". W Revision Surgery in Total Hip Arthroplasty, 29–46. London: Springer London, 1990. http://dx.doi.org/10.1007/978-1-4471-1788-9_5.

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Nabers, Dirk. "Dislocation". W A Poststructuralist Discourse Theory of Global Politics, 151–74. New York: Palgrave Macmillan US, 2015. http://dx.doi.org/10.1057/9781137528070_8.

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Cioffi, William G., Michael D. Connolly, Charles A. Adams, Mechem C. Crawford, Aaron Richman, William H. Shoff, Catherine T. Shoff i in. "Traumatic Spine Dislocation/Fracture-Dislocation". W Encyclopedia of Intensive Care Medicine, 2325. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_2336.

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Adachi, Hiroki. "Synchrotron X-ray Study on Plaston in Metals". W The Plaston Concept, 197–212. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7715-1_9.

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AbstractGrain refinement is one of the methods applied to strengthen metallic materials, and various peculiar mechanical properties have been reported to be expressed when the grain size is reduced to less than submicron dimensions. This is considered to be due to a change in the behavior of dislocations that are associated with plastic deformation. In situ synchrotron radiation measurements of microstructural changes during deformation in face-centered cubic (fcc) metals with grain sizes of 20 μm to 5 nm were performed to systematically investigate the effects of grain size on dislocation behavior during plastic deformation. In pure aluminum with grain sizes of 20 to 3 μm, the dislocation density during plastic deformation was approximately 1014 m−2, regardless of the grain size. However, when the grain size was less than 3 μm, the dislocation density increased monotonically in proportion to the grain size to the power of -1. Furthermore, in a nickel alloy with a grain size of less than 10 nm, this relationship was no longer satisfied, and the results suggested that deformation progresses due to partial dislocations. In materials with a grain size of less than 1 μm, the dislocation density after unloading became much smaller than that during loading.
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Brady, Jacqueline Munch. "Acute Patellar Dislocation (First-Time Dislocator)". W Patellofemoral Pain and Instability, 141–48. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97640-2_7.

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Menetrey, Jacques. "Knee Dislocation". W European Instructional Lectures, 155–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54030-1_13.

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Streszczenia konferencji na temat "Dislocation"

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Browe, Daniel P., Carrie A. Voycheck, Patrick J. McMahon i Richard E. Debski. "Injury to the Glenohumeral Capsule During Anterior Dislocation Results in Damage to the Anteroinferior Capsule". W ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53840.

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The glenohumeral joint is the most frequently dislocated major joint in the body with about 2% of the population dislocating their shoulders between the ages of 18 and 70 [1]. About 80% of these shoulder dislocations occur in the anterior direction, and they most commonly occur in the apprehension position, which is characterized by 60° of glenohumeral abduction and 60° of external rotation [2]. The most common pathology associated with dislocation is instability due to permanent deformation [3]. Current surgical repair techniques for shoulder dislocations are inadequate with about 25% of patients still experiencing pain and instability after surgery [4]. By assessing the strain distribution, it is possible to determine the stabilizing function of the various capsular regions. In addition, surgeons could benefit from knowing the location and extent of tissue damage when placating the capsule during repair procedures. Therefore, the objective of this study was to determine the location and extent of injury to the anteroinferior capsule during anterior dislocation by quantifying the strain at dislocation and the non-recoverable strain following dislocation.
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Browe, Daniel P., Carrie A. Rainis, Patrick J. McMahon i Richard E. Debski. "The Effect of Anterior Dislocation on the Mechanical Properties of the Inferior Glenohumeral Ligament". W ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80099.

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The glenohumeral joint is the most frequently dislocated major joint in the body with about 2% of the population dislocating their shoulders between the ages of 18 and 70 [1]. Instability due to permanent deformation of the glenohumeral capsule is commonly associated with dislocation [2]. Current surgical repair techniques for shoulder dislocations typically consist of plication of the glenohumeral capsule, or folding the tissue over on itself, to reduce redundancy in the capsule and restore stability to the shoulder. Up to 25% of patients who undergo surgery for a shoulder dislocation still experience pain, instability, and recurrent dislocation after surgery [3]. It is hypothesized that the mechanical properties of the glenohumeral capsule change in response to dislocation. In addition, the magnitude and location of these changes may have implications for the ideal location and extent of plication. Therefore, the objective of this study was to quantify the mechanical properties of the axillary pouch of the glenohumeral capsule in tension and shear after anterior dislocation.
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Banerjee, Sauvik, Mutasem Shehadeh, Gang Lu, Nicholas Kioussis i Nasr Ghoniem. "A Multiscale Approach for the Determination of Nonsingular Elastic Fields of Dislocations in Bulk and Nano-Layered Materials". W ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42058.

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The traditional description of elastic field and energies of dislocations is based on continuum theory of linear elasticity that suffers from the long-standing problem of singularities at the dislocation core. Singular solutions are often circumvented by introducing an artificial core-cutoff radius. This limits the applicability of the theory to describe situations where it is important to know the strained state and nanoscopic details within a few atomic spacings surrounding the dislocation center, known as the dislocation core. In this paper, a computationally tractable multiscale approach is developed to calculate the nonsingular elastic fields of dislocations in both bulk and nano-layered materials. The approach is an extension of Peierls-Nabarro (PN) model, with the following features: (1) all three components of the displacement vector for atoms within the dislocation core are included; (2) the entire generalized stacking fault energy (GSFE or gamma-γ) surface obtained from ab initio calculations is utilized; and (3) the method can be generalized to treat curved dislocations. We combine the parametric dislocation dynamics (DD) approach for the interaction and motion of dislocations with the ab initio calculations of the lattice restoring forces, which are extracted from the γ surface. The method is used to study two important problems: (a) dislocation dissociation in bulk crystals (b) dislocation transmission across interfaces in elastic bimaterials. Dislocation core structures in bulk aluminum and silver are determined. The results from the model are shown to be in excellent agreement with experiments for both Al and Ag. For bi-materials system, the effects of the mismatch in the elastic properties, γ surface and lattice parameters on the spreading of the dislocation onto the interface(s) and the transmission across the interface(s) are studied in detail.
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Oyinbo, Sunday Temitope, i Tien-Chien Jen. "Molecular Dynamics Simulation of the Effect of Hydrogen on the Interaction Between Dislocations in Alpha-Iron". W ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94722.

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Abstract In this study, we use extensive molecular dynamics (MD) calculations based on a highly-accurate interatomic potential to examine how hydrogen atoms impact the mechanisms behind the mobilities of edge and screw dislocations in alpha-iron (α-Fe) at a temperature ranging from 300 K to 500 K. The dislocation mobility in α-Fe is shown to be temperature and hydrogen concentration-dependent in this MD investigation. It is demonstrated from the results that hydrogen impurities that are efficient in locking dislocations exist in the form of complexes that are scattered discretely along the dislocation line and that these complexes operate as extremely effective impediments to the mobility of dislocations. The hydrogen impact on the edge dislocation motion from the dislocation velocities versus shear stress reveals that the movement of edge dislocations in α-Fe with hydrogen is much damped as the hydrogen concentration increases. Furthermore, the motion of screw dislocations in the α-Fe is by the process of kink-pair nucleation and migration. according to the simulation results, the locking mechanism of the cross-slip seen along the dislocation path is due to the strong-feature energy landscape and inherent energy fluctuation in the system, resulting in jogs formation.
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Huang, Haiying, George A. Kadomateas i Valeria La Saponara. "Mixed Mode Interface Cracks in a Bi-Material Half Plane and a Bi-Material Strip". W ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0900.

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Abstract This paper presents a method for determining the dislocation solution in a bi-material half plane and a bi-material infinite strip, which is subsequently used to obtain the mixed-mode stress intensity factors for a corresponding bi-material interface crack. First, the dislocation solution in a bi-material infinite plane is summarized. An array of surface dislocations is then distributed along the free boundary of the half plane and the infinite strip. The dislocation densities of the aforementioned surface dislocations are determined by satisfying the traction-free boundary conditions. After the dislocation solution in the finite domain is achieved, the mixed-mode stress intensity factors for interface cracks are calculated based on the continuous dislocation technique. Results are compared with analytical solution for homogeneous anisotropic media.
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Tan, E. H., i L. Z. Sun. "Dislocation Dynamics Modeling for Yield Strength of Nanoscale Film Heterostructures". W ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79222.

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A novel dislocation dynamics framework is developed to simulate dislocation evolutions in thin film heterostructures at nanoscale. It is based on 3-D dislocation motion together with its physical background by adding the solid viscous effect. As the numerical simulation results demonstrate, this new model completely solves a long-standing paradoxical phenomenon with which the simulation results were dependent on dislocation-segment lengths in the classical discrete dislocation dynamics theory. The proposed model is applied to simulate the effect of dislocations on the mechanical performance of thin films. The interactions among the dislocation loop, free surface and interface are rigorously computed by decomposing this complicated problem into two relatively simple sub-problems. This model is allowed to determine the critical thickness of thin films for a surface loop to nucleate and to simulate how a surface loop evolves into two threading dislocations. Furthermore, the relationship between the film thickness and yield strength is constructed and compared with the conventional Hall-Petch relation.
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Bow, Jong-Shing, i Speed Yu. "Depth Measurement of Dislocations in Si Substrate by Stereo TEM". W ISTFA 2005. ASM International, 2005. http://dx.doi.org/10.31399/asm.cp.istfa2005p0233.

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Abstract Traditional plane-view TEM images, which have large fields of view and are usually used to check the existence of dislocations, cannot tell whether a dislocation goes through the p-n junction or not. While XTEM images tell the local depth of a small part of a dislocation only, other methods have to be developed to explore how a dislocation goes in the substrate. In this article, the authors have modified the technique of stereo TEM, which was used to study the 3D shapes of precipitates, to study how a dislocation runs in the Si substrate. Three images recorded after tilting the TEM sample were used for measuring the dislocation depth profile. The distances between a few chosen points on the dislocation and the reference line were measured from above three images. Results suggested that the depth profiles of dislocations in the Si substrate can be accurately determined by stereo TEM.
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Li, Chengzhi, i Guanshui Xu. "Dislocation Nucleation at Heterogeneities of Crystal Surfaces". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60857.

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Dislocation nucleation at surface heterogeneities such as steps is analyzed based on the Peierls-Nabarro dislocation model. By modeling a surface step as part of a three-dimensional crack surface, the half space problem is transferred into an equivalent three dimensional crack problem in an infinite medium. The profiles of embryonic dislocations, corresponding to the relative displacements between the two adjacent atomic layers along the slip planes, are then rigorously solved through the variational boundary integral method. The critical conditions for dislocation nucleation are determined by solving the stress dependent activation energies required to activate embryonic dislocations from their stable to unstable saddle point configurations. The effects of step geometry are analyzed in detail. The results show that the atomic scale steps can significantly facilitates dislocation nucleation from stressed crystal surfaces. While the presented methodology of incorporating atomic information into continuum approach is noteworthy for providing insights of energetics of the atomic process involved in dislocation nucleation, further direct atomic simulation appears to be in need to correlate the effectiveness of this approach.
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Shao, S., i S. N. Medyanik. "Interaction of Dislocations With Interfaces in Nanoscale Multilayered Metallic Composites". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67523.

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Atomistic simulation studies of dislocation nucleation and propagation in nanoscale multilayered metallic systems (Cu-Ni and Cu-Nb) are performed. Nanoindentation model is used to generate dislocations at and near the surface. Interaction of the propagating dislocations with two types of interfaces (coherent and incoherent) is analyzed. In the case of coherent interface, Cu(111)-Ni(111), dislocations that initiate in Cu layer propagate through the interface into Ni. However, the interface acts as an obstacle for dislocation propagation and leads to a higher dislocation density near the interface. In the case of incoherent interface, Cu(111)-Nb(110), dislocations that initiate in Cu do not propagate into Nb and tend to accumulate in copper near the interface. In both cases, the interfaces provide mechanisms for strengthening the nanoscale multilayered metallic systems.
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Wang, Chung-Hao. "Cylindrically Anisotropic Tubes Containing a Line Dislocation". W ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93188.

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An analytical solution of the problem of a cylindrically anisotropic tube which contains a line dislocation is presented in this study. The state space formulation in conjunction with the eigenstrain theory is proved to be a feasible and systematic methodology to analyze a tube with the existence of dislocations. The state space formulation which expediently groups the displacements and the cylindrical surface traction can construct a governing differential matrix equation. By using Fourier series expansion and the well developed theory of matrix algebra, the asymmetrical solutions are not only explicit but also compact in form. The dislocation considered in this study is a kind of mixed dislocation which is the combination of edge dislocations and a screw dislocation and the dislocation line is parallel to the longitudinal axis of the tube. The degeneracy of the eigen relation and the technique to determine the inverse of a singular matrix are thoroughly discussed, so that the general solutions can be applied to the case of isotropic tubes, which is one of the novel features of this research. The results of isotropic problems, which are belong to the general solutions, are compared with the well-established expressions in the literature. The satisfied correspondences of these comparisons indicate the validness of this study. A cylindrically orthotropic tube is also investigated as an example and the numerical results for the displacements and tangential stress on the outer surface are displayed. The effects on surface stresses due to the existence of a dislocation appear to have a characteristic of localized phenomenon.
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Raporty organizacyjne na temat "Dislocation"

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Munday, Lynn B., i Jaroslaw Knap. Anisotropic Dislocation Line Energy and Crack Tip Dislocation Nucleation in (alpha)RDX. Fort Belvoir, VA: Defense Technical Information Center, listopad 2013. http://dx.doi.org/10.21236/ada592063.

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Goyal, Shikha, Freny R. Karjodkar, Kaustubh Sansare i Ankita Verma. Efficacy of Autologous Blood Injections in Treatment of Chronic Recurrent TMJ Dislocation Based on its Severity: A Prospective Study. International Journal of Surgery, marzec 2024. http://dx.doi.org/10.60122/j.ijs.2024.10.04.

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Aim: To study the efficacy of autologous blood injections in treatment of chronic recurrent TMJ dislocation based on the severity of the condition. Method and Material: Total 26 patients with complain of chronic recurrent bilateral TMJ dislocation were included in the study. The patients were grouped into three groups based on the frequency of episodes of TMJ dislocation: Group 1 (7 patients) included patients with minimum one episode of TMJ dislocation each day, Group 2 (5 patients) included patients with minimum of 2 episodes of TMJ dislocation each week and Group 3 (14 patients) included patients with minimum of 2 episodes in last 6 months. In each joint, 2ml of autologous blood was injected in superior joint space and 0.5 ml was injected into the peri capsular area. Post injection patients were followed for the period ranging from 6 months to the 2 years. Patients were assessed for frequency of episodes of TMJ dislocation and inter-incisal opening (IO) before the start of the treatment and during the follow up visit. Results: On long term follow up (1 to 2 years) 2 patients in Group 1 showed recurrence of TMJ dislocation. However, none of the patients from Group 2 and 3 showed recurrence of the condition. It was analyzed that success of the ABI was found to be inversely proportional to the frequency of the episodes during the pre -injection phase. Conclusion: ABI is the safe, conservative, cost effective, non- invasive and simpler treatment approach for the TMJ dislocation, however the treatment outcome is better with the patients experiencing less frequent episodes.
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Chen, Qian. Evolution, Interaction, and Intrinsic Properties of Dislocations in Intermetallics: Anisotropic 3D Dislocation Dynamics Approach. Office of Scientific and Technical Information (OSTI), styczeń 2008. http://dx.doi.org/10.2172/939374.

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Smyth, Richard H. Dislocation and the Enemy Commander. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1997. http://dx.doi.org/10.21236/ada442219.

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Summerfield, G. C., J. S. King, B. Heuser i J. E. Epperson. Dislocation-hydrogen correlation in metals. Office of Scientific and Technical Information (OSTI), listopad 1987. http://dx.doi.org/10.2172/5330578.

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Mishin, Y. Dislocation Diffusion in Metallic Materials. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2011. http://dx.doi.org/10.21236/ada590192.

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Douglas Lloyd Medin. Mechanisms of Dislocation Grain Boundary Interaction. Office of Scientific and Technical Information (OSTI), listopad 2002. http://dx.doi.org/10.2172/810716.

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Hamilton, John C. First principles determination of dislocation properties. Office of Scientific and Technical Information (OSTI), grudzień 2003. http://dx.doi.org/10.2172/918250.

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Doyle, Kevin, i Sudhir Trivedi. Dislocation Etching Solutions for Mercury Cadmium Selenide. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2014. http://dx.doi.org/10.21236/ada609573.

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Tang, M., G. Hommes, S. Aubry i A. Arsenlis. ParaDiS-FEM dislocation dynamics simulation code primer. Office of Scientific and Technical Information (OSTI), wrzesień 2011. http://dx.doi.org/10.2172/1037843.

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