Zirconium Alloy Mechanical State and its Evolution during Deformation

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The Effect of Hydrogen on the Parameters of Plastic Deformation Localization in Low Carbon Steel

In the present study, the effect of interstitial hydrogen atoms on the mechanical properties and plastic strain localization patterns in tensile tested polycrystals of low-carbon steel Fe-0.07%C has been studied using double exposure speckle photography technique. The main parameters of plastic flow localization at various stages of deformation hardening have been determined in polycrystals of steel electrolytically saturated with hydrogen in a three-electrode electrochemical cell at a controlled constant cathode potential. Also, the effect of hydrogen on changing of microstructure by using optical microscopy has been demonstrated

Hysteresis phenomena during melting of an ultrathin lubricant film

The influence of a deformational defect of the shear modulus on the melting of an ultrathin lubricant film was investigated in the framework of the Lorenz model used for describing a viscoelastic medium. It was established that the film can undergo both stepwise and continuous melting. Analysis of the lubricant behavior revealed that there are three modes corresponding to a zero shear stress, a Hookean portion in the loading diagram, and a plastic-flow portion. The hysteresis in the dependences of the stationary shear stress on the strain and the friction surface temperature is examined. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/1621

Cutting Edge Geometry Effect on Plastic Deformation of Titanium Alloy

The paper presents experimental studies of ОТ4 titanium alloy machining with cutting edges of various geometry parameters. Experiments were performed at a low speed by the scheme of free cutting. Intensity of plastic shear strain was set for defining of cutting edge geometry effect on machining. Images of chip formed are shown. Estimation of strain magnitude was accomplished with digital image correlation method. Effect of rake angle and cutting edge angle has been studied. Depth of deformed layer and the area of the plastic strain is determine. Results showed that increasing the angle of the cutting edge inclination results in a change the mechanism of chip formation

Hidden geometric correlations in real multiplex networks

Real networks often form interacting parts of larger and more complex systems. Examples can be found in different domains, ranging from the Internet to structural and functional brain networks. Here, we show that these multiplex systems are not random combinations of single network layers. Instead, they are organized in specific ways dictated by hidden geometric correlations between the individual layers. We find that these correlations are strong in different real multiplexes, and form a key framework for answering many important questions. Specifically, we show that these geometric correlations facilitate: (i) the definition and detection of multidimensional communities, which are sets of nodes that are simultaneously similar in multiple layers; (ii) accurate trans-layer link prediction, where connections in one layer can be predicted by observing the hidden geometric space of another layer; and (iii) efficient targeted navigation in the multilayer system using only local knowledge, which outperforms navigation in the single layers only if the geometric correlations are sufficiently strong. Our findings uncover fundamental organizing principles behind real multiplexes and can have important applications in diverse domains.Comment: Supplementary Materials available at http://www.nature.com/nphys/journal/v12/n11/extref/nphys3812-s1.pd

Photochemistry of Furyl- and Thienyldiazomethanes: Spectroscopic Characterization of Triplet 3-Thienylcarbene

Photolysis (λ \u3e 543 nm) of 3-thienyldiazomethane (1), matrix isolated in Ar or N2 at 10 K, yields triplet 3-thienylcarbene (13) and α-thial-methylenecyclopropene (9). Carbene 13 was characterized by IR, UV/vis, and EPR spectroscopy. The conformational isomers of 3-thienylcarbene (s-E and s-Z) exhibit an unusually large difference in zero-field splitting parameters in the triplet EPR spectrum (|D/hc| = 0.508 cm–1, |E/hc| = 0.0554 cm–1; |D/hc| = 0.579 cm–1, |E/hc| = 0.0315 cm–1). Natural Bond Orbital (NBO) calculations reveal substantially differing spin densities in the 3-thienyl ring at the positions adjacent to the carbene center, which is one factor contributing to the large difference in D values. NBO calculations also reveal a stabilizing interaction between the sp orbital of the carbene carbon in the s-Z rotamer of 13 and the antibonding σ orbital between sulfur and the neighboring carbon—an interaction that is not observed in the s-E rotamer of 13. In contrast to the EPR spectra, the electronic absorption spectra of the rotamers of triplet 3-thienylcarbene (13) are indistinguishable under our experimental conditions. The carbene exhibits a weak electronic absorption in the visible spectrum (λmax = 467 nm) that is characteristic of triplet arylcarbenes. Although studies of 2-thienyldiazomethane (2), 3-furyldiazomethane (3), or 2-furyldiazomethane (4) provided further insight into the photochemical interconversions among C5H4S or C5H4O isomers, these studies did not lead to the spectroscopic detection of the corresponding triplet carbenes (2-thienylcarbene (11), 3-furylcarbene (23), or 2-furylcarbene (22), respectively)

Система VI-RADS и уровни биомаркеров опухолевого микроокружения у больных раком мочевого пузыря при выборе тактики лечения

Objective: to identify the role simultaneous use of the Vesical Imaging-Reporting and Data System (VI-RADS) and the assessment of serum levels of several mediators and growth factors for the evaluation of metastatic process and disease stage in patients with bladder cancer.Materials and methods. This retrospective study included 85 patients with histologically verified transitional cell (urothelial) bladder carcinoma (stages рТа—TINOMO. [)T2NOMO, рТ3—4NN0M0, and [)T2—4N1—3M1) and 20 healthy controls. In addition to general clinical examinations, all patients have undergone preoperative diffusion-weighted magnetic resonance imaging of the pelvis with background suppression. We calculated the diffusion coefficient and included it into the VI-RADS protocol. All study participants were also tested for their serum levels of vascular endothelial growth factor (VEGF), interleukin-8 (IL-8), monocyte chemoattractant protein 1 (MSP-1), interferon γ (IFN-γ), transforming growth factor β1 (TGF- β1), granulocyte colony-stimulating factor (G-CSF), and granulocyte-macrophage colonystimulating factor (GM-CSF) using enzyme-linked immunosorbent assay (ELISA).Results and conclusion. We found that the preoperative use of VI-RADS together with the assessment of serum levels of pro-inflammatory mediators, colony-stimulating factors, and growth factors in patients with muscle-invasive bladder cancer provide additional information about the activity of malignant transformation in tumor tissue and tumor spread. Their simultaneous use during the examination of patients with muscle-invasive bladder cancer is a promising diagnostic approach to monitor treatment response.Цель исследования — установить значение совместного использования системы VI-RADS и исследования содержания в сыворотке крови группы медиаторов и факторов роста для оценки метастатического процесса и стадии заболевания у пациентов с раком мочевого пузыря.Материалы и методы. В ретроспективный анализ включены данные 85 больных с гистологически верифицированным переходноклеточным (уротелиальным) раком мочевого пузыря стадий рТа—TINOMO, pT2N0M0, pT3—4NN0M0, pT2—4N1—3M1 и 20пра-ктически здоровых лиц. Наряду с общеклиническими методами исследования до оперативного вмешательства проводили магнитно-резонансную томографию, диффузионно-взвешенную визуализацию с подавлением фонового сигнала тела и получали диффузионно-взвешенные изображения органов малого таза с расчетом измеряемого коэффициента диффузии с дальнейшим включением в протокол VI-RADS. Методом твердофазного иммуноферментного анализа определяли концентрацию фактора роста эндотелия сосудов (VEGF), интерлейкина 8 (IL-8), моноцитарного хемоаттрактантного протеина 1 (МСР-1), интерферона γ (IFN- γ), трансформирующего фактора роста β1 (TGF- β1), гранулоцитарного колониестимулирующего фактора (G-CSF), гранулоцитарного макрофагального колониестимулирующего фактора роста (GM-CSF).Результаты и заключение. Установлено, что применение системы VI-RADS и проведение исследования содержания в сыворотке крови группы провоспалительных медиаторов, колониестимулирующих и факторов роста в дооперационном периоде наблюдения больных мышечно-инвазивным раком мочевого пузыря позволяют получить дополнительную информацию о степени активности злокачественной трансформации опухолевой ткани и распространенности опухолевого процесса. Их совместное использование при обследовании больных мышечно-инвазивным раком мочевого пузыря можно считать одним из перспективных подходов для мониторинга ответа на лечение

Locally Non-centrosymmetric Superconductivity in Multilayer Systems

Although multilayer systems possess global inversion symmetry, some of the layers lack local inversion symmetry because no global inversion centers are present on such layers. Such locally non-centrosymmetric systems exhibit spatially modulated Rashba spin-orbit coupling. In this study, the superconductivity in multilayer models exhibiting inhomogeneous Rashba spin-orbit coupling is investigated. We study the electronic structure, superconducting gap, and spin susceptibility in the superconducting state with mixed parity order parameters. We show the enhancement of the spin susceptibility by Rashba spin-orbit coupling and interpret it on the basis of the crossover from a centrosymmetric superconductor to a non-centrosymmetric superconductor. It is also shown that the spin susceptibility is determined by the phase difference of the order parameter between layers and is nearly independent of the parity mixing of order parameters. An intuitive understanding is given on the basis of the analytic expression of superconducting order parameters in the band basis. The results indicate that not only a broken global inversion symmetry but also a broken local inversion symmetry leads to unique properties of superconductivity. We discuss the superconductivity in artificial superlattices involving CeCoIn5 and multilayer high-Tc cuprates.Comment: 11 pages, 13 figures, final version for publication in J. Phys. Soc. Jp

Network Geometry and Complexity

(28 pages, 11 figures)Higher order networks are able to characterize data as different as functional brain networks, protein interaction networks and social networks beyond the framework of pairwise interactions. Most notably higher order networks include simplicial complexes formed not only by nodes and links but also by triangles, tetrahedra, etc. More in general, higher-order networks can be cell-complexes formed by gluing convex polytopes along their faces. Interestingly, higher order networks have a natural geometric interpretation and therefore constitute a natural way to explore the discrete network geometry of complex networks. Here we investigate the rich interplay between emergent network geometry of higher order networks and their complexity in the framework of a non-equilibrium model called Network Geometry with Flavor. This model, originally proposed for capturing the evolution of simplicial complexes, is here extended to cell-complexes formed by subsequently gluing different copies of an arbitrary regular polytope. We reveal the interplay between complexity and geometry of the higher order networks generated by the model by studying the emergent community structure and the degree distribution as a function of the regular polytope forming its building blocks. Additionally, we discuss the underlying hyperbolic nature of the emergent geometry and we relate the spectral dimension of the higher-order network to the dimension and nature of its building blocks