Artykuły w czasopismach: „Universal meshes”

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Shen, Yongxing, Can Wu i Yang Wan. "Universal meshes for a branched crack". Finite Elements in Analysis and Design 129 (lipiec 2017): 53–62. http://dx.doi.org/10.1016/j.finel.2016.12.003.

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Rangarajan, Ramsharan, i Adrián J. Lew. "Universal meshes: A method for triangulating planar curved domains immersed in nonconforming meshes". International Journal for Numerical Methods in Engineering 98, nr 4 (4.03.2014): 236–64. http://dx.doi.org/10.1002/nme.4624.

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Bogomjakov, A., i C. Gotsman. "Universal Rendering Sequences for Transparent Vertex Caching of Progressive Meshes". Computer Graphics Forum 21, nr 2 (czerwiec 2002): 137–49. http://dx.doi.org/10.1111/1467-8659.00573.

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Rangarajan, Ramsharan, Maurizio M. Chiaramonte, Michael J. Hunsweck, Yongxing Shen i Adrian J. Lew. "Simulating curvilinear crack propagation in two dimensions with universal meshes". International Journal for Numerical Methods in Engineering 102, nr 3-4 (18.08.2014): 632–70. http://dx.doi.org/10.1002/nme.4731.

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Kabaria, Hardik, i Adrian J. Lew. "Universal meshes for smooth surfaces with no boundary in three dimensions". International Journal for Numerical Methods in Engineering 110, nr 2 (19.10.2016): 133–62. http://dx.doi.org/10.1002/nme.5350.

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Kabaria, Hardik, i Adrian J. Lew. "Universal meshes for smooth surfaces with no boundary in three dimensions". International Journal for Numerical Methods in Engineering 114, nr 10 (19.04.2018): 1160–62. http://dx.doi.org/10.1002/nme.5808.

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Rachowicz, W., J. T. Oden i L. Demkowicz. "Toward a universal adaptive finite element strategy part 3. design of meshes". Computer Methods in Applied Mechanics and Engineering 77, nr 1-2 (grudzień 1989): 181–212. http://dx.doi.org/10.1016/0045-7825(89)90131-x.

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Rangarajan, Ramsharan, Hardik Kabaria i Adrian Lew. "An algorithm for triangulating smooth three-dimensional domains immersed in universal meshes". International Journal for Numerical Methods in Engineering 117, nr 1 (30.09.2018): 84–117. http://dx.doi.org/10.1002/nme.5949.

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Roney, Caroline H., Ali Pashaei, Marianna Meo, Rémi Dubois, Patrick M. Boyle, Natalia A. Trayanova, Hubert Cochet, Steven A. Niederer i Edward J. Vigmond. "Universal atrial coordinates applied to visualisation, registration and construction of patient specific meshes". Medical Image Analysis 55 (lipiec 2019): 65–75. http://dx.doi.org/10.1016/j.media.2019.04.004.

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Custodio, R., J. D. Goddard, M. Giordan i N. H. Morgon. "The application of an optimization technique to the development of universal basis sets". Canadian Journal of Chemistry 70, nr 2 (1.02.1992): 580–88. http://dx.doi.org/10.1139/v92-081.

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The Simplex method was used to define atomic and universal meshes using the integral discretization technique for the Griffin–Hill–Wheeler-Hartree–Fock equations. This technique represents a basis set as an exponential set of the form:[Formula: see text]For atoms, the minimum total energy criterion was employed. For the universal basis, three different procedures were tested: (a) defining the universal basis using information on the isolated atoms, (b) determining the universal Ω0(k) through atomic calculations and reoptimizing the ΔΩ(k) for different symmetries employing simultaneously a single atomic calculation as a reference point, and (c) optimizing the universal mesh using a statistical criterion such as the squares of the deviations of the total energy. The meshes obtained by the minimum total energy criterion or the squares of deviations of the total energy for the universal basis are accurate for the total energy but the weight functions are deficient in the valence region. Shifting the optimized Ω0(k) to [Formula: see text], fixing [Formula: see text], and reoptimizing ΔΩ(k) for each symmetry species produces a better description of weight functions at the expense of a less accurate total energy. In general, no significant statistical difference was observed for the various universal bases generated by procedures (a) and (b) or by (c) provided the shift correction was made to the latter. Application of these bases to diatomic molecules (N2, CO, P2, CS) showed that the universal bases are as accurate as those optimized for atomic systems. If the bases are transferred from atoms to molecules, the shift corrections to the weight functions of the atoms are not useful in molecular calculations. The almost equivalent molecular properties and the good total energies show that the best basis for molecular calculations is that optimized by procedure (c). Keywords: universal basis sets, integral discretization technique.

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Manikandhan, Mr KU, i M. Thiyaga Bala. "Experimental Investigation on Flexural Behaviour of Ferrocement Laminates Using Different Forms of Meshes". International Journal for Research in Applied Science and Engineering Technology 10, nr 12 (31.12.2022): 1942–46. http://dx.doi.org/10.22214/ijraset.2022.48174.

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Abstract: The present study describes the results of testing ferrocement panels reinforced with of different types of meshes. The main objective of the study was to investigate the effect of different types of meshes as reinforcement in thin mortar specimen and select the best suitable mesh for further work. Types of meshes were used expanded metal mesh, galvanized woven mesh and welded mesh has a diameter of 1.58 mm. Size of openings are 20x35 mm, 10x10 mm and 15x15 mm. Panels of a size of 560x150x35 mm were reinforced with three layers of wire mesh. Panels were casted with mortar of mix proportion 1:2 and water cement ratio 0.40. The four specimens were tested under four-point loading system on universal testing machine after curing period of 7 days and eight specimens after curing period of 28 days. Test results shows that the flexural strength of the specimen with welded mesh exhibits greater flexural strength than other two types of meshes.

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Atanasovska, Ivana, Dejan Momčilović i Milorad Gavrilovski. "Development of the universal tool for testing of tensile properties of hexagonal steel wire mesh for civil engineering". Metallurgical and Materials Engineering 24, nr 2 (2.07.2018): 113–22. http://dx.doi.org/10.30544/365.

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The developing of the universal tool for testing of tensile properties of hexagonal steel wire mesh for civil engineering is described in this paper. The developed tool allows repeated testing of hexagonal steel wire mesh of different dimensions without tool changes and is generally related with the procedure for the determination of tensile strength properties of different wire meshes. The construction of the tool which is related to the aims of the decreased mass consumption and high operation safety is described in detail. Particular attention is focused on the safety component of the tool which ensuring safety testing by preventing slipping of the wire mesh samples during loading. The paper also presents the Finite Element Analysis performed in order to verify the high safety factor of the developed tool. The contact regions with stress concentration behavior are analyzed by non-linear solvers. The obtained results and conclusion about the possible contributions of the developed universal tool for extensively testing of wire meshes for civil engineering are discussed.

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Gawlik, Evan S., Hardik Kabaria i Adrian J. Lew. "High-order methods for low Reynolds number flows around moving obstacles based on universal meshes". International Journal for Numerical Methods in Engineering 104, nr 7 (26.03.2015): 513–38. http://dx.doi.org/10.1002/nme.4891.

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Hasan-Zadeh, Atefeh. "Geometric Approach to Optimal Path Problem with Uncertain Arc Lengths". Journal of Advanced Computer Science & Technology 9, nr 1 (25.07.2020): 11. http://dx.doi.org/10.14419/jacst.v9i1.30674.

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In this paper, the problem of finding the shortest paths, one of the most important problems in science and technology has been geometrically studied. Shortest path algorithm has been generalized to the shortest cycles in each homotopy class on a surface with arbitrary topology, using the universal covering space notion in the algebraic topology. Then, a general algorithm has been presented to compute the shortest cycles (geometrically rather than combinatorial) in each homotopy class. The algorithm can handle surface meshes with the desired topology, with or without boundary. It also provides a fundamental framework for other algorithms based on universal coverage space due to the capacity and flexibility of the framework.

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Navarro-Mateu, Diego, i Ana Cocho-Bermejo. "Evo-Devo Strategies for Generative Architecture: Colour-Based Patterns in Polygon Meshes". Biomimetics 5, nr 2 (22.05.2020): 23. http://dx.doi.org/10.3390/biomimetics5020023.

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Parametric design in architecture is often pigeonholed by its own definition and computational complexity. This article explores the generative capacity to integrate patterns and flows analogous to evolutionary developmental biology (Evo-Devo) strategies to develop emergent proto-architecture. Through the use of coloured patterns (genotype) and the modification of polygonal meshes (phenotype), a methodological proposal is achieved that is flexible to changes and personalization, computationally efficient, and includes a wide range of typologies. Both the process and the result are oriented towards computational lightness for a future and better integration of the workflow in genetic algorithms. Flow-based programming is used to replicate genetic properties such as multifunctionality, repeatability and interchangeability. The results reinforce the biological strategies against other more computationally abstract ones and successfully execute the parallels of universal mechanisms in Evo-Devo that are present in life.

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Xu, Wanjun, Kang Li, Zhengyang Geng, Mingjie Zhang i Jiangang Yang. "A Local Adaptive Mesh Refinement for JFO Cavitation Model on Cartesian Meshes". Applied Sciences 11, nr 21 (22.10.2021): 9879. http://dx.doi.org/10.3390/app11219879.

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Nonuniform mesh is beneficial to reduce computational cost and improve the resolution of the interest area. In the paper, a cell-based adaptive mesh refinement (AMR) method was developed for bearing cavitation simulation. The bearing mesh can be optimized by local refinement and coarsening, allowing for a reasonable solution with special purpose. The AMR algorithm was constructed based on a quadtree data structure with a Z-order filling curve managing cells. The hybrids of interpolation schemes on hanging nodes were applied. A cell matching method was used to handle periodic boundary conditions. The difference schemes at the nonuniform mesh for the universal Reynolds equation were derived. Ausas’ cavitation algorithm was integrated into the AMR algorithm. The Richardson extrapolation method was employed as an a posteriori error estimation to guide the areas where they need to be refined. The cases of a journal bearing and a thrust bearing were studied. The results showed that the AMR method provided nearly the same accuracy results compared with the uniform mesh, while the number of mesh was reduced to 50–60% of the number of the uniform mesh. The computational efficiency was effectively improved. The AMR method is suggested to be a potential tool for bearing cavitation simulation.

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Guo, Hailong, Cong Xie i Ren Zhao. "Superconvergent gradient recovery for virtual element methods". Mathematical Models and Methods in Applied Sciences 29, nr 11 (październik 2019): 2007–31. http://dx.doi.org/10.1142/s0218202519500386.

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Virtual element method is a new promising finite element method using general polygonal meshes. Its optimal a priori error estimates are well established in the literature. In this paper, we take a different viewpoint. We try to uncover the superconvergent property of virtual element methods by doing some local post-processing only on the degrees of freedom. Using the linear virtual element method as an example, we propose a universal gradient recovery procedure to improve the accuracy of gradient approximation for numerical methods using general polygonal meshes. Its capability of serving as a posteriori error estimators in adaptive computation is also investigated. Compared to the existing residual-type a posteriori error estimators for the virtual element methods, the recovery-type a posteriori error estimator based on the proposed gradient recovery technique is much simpler in implementation and it is asymptotically exact. A series of benchmark tests are presented to numerically illustrate the superconvergence of recovered gradient and validate the asymptotic exactness of the recovery-based a posteriori error estimator.

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Matthews, Clive. "Grammar Frameworks In Intelligent CALL". CALICO Journal 11, nr 1 (14.01.2013): 5–27. http://dx.doi.org/10.1558/cj.v11i1.5-27.

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Most recent work in ICALL has tended to focus on syntactic structure. Clearly the grammar formalism chosen for such systems is of some importance. However, as this paper argues, little consideration seems to have been paid to such matters beyond the question of computational efficiency. Following previous work, the paper further argues for choosing a formalism that potentially meshes with work in SLA. Of all the main grammar formalisms being developed, GB theory, with its emphasis on Universal Grammar, has had the most impact on SLA research. Recent advances in "principle based" parsing now make possible the integration of such work into ICALL.

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Lu, Liangjun, Linjie Zhou i Jianping Chen. "Programmable SCOW Mesh Silicon Photonic Processor for Linear Unitary Operator". Micromachines 10, nr 10 (26.09.2019): 646. http://dx.doi.org/10.3390/mi10100646.

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Universal unitary multiport interferometers (UMIs) can perform any arbitrary unitary transformation to a vector of input optical modes, which are essential for a wide range of applications. Most UMIs are realized by fixed photonic circuits with a triangular or a rectangular architecture. Here, we present the implementation of an N × N rectangular UMI with a programmable photonic processor based on two-dimensional meshes of self-coupled optical waveguide (SCOW) resonant structures. Our architecture shows a high tolerance to the unbalanced loss upon interference. This work enriches the functionality of the SCOW mesh photonic processors, which are promising for field-programmable photonic arrays.

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Grossman‐Ponemon, Benjamin E., i Adrian J. Lew. "An algorithm for the simulation of curvilinear plane‐strain and axisymmetric hydraulic fractures with lag using the universal meshes". International Journal for Numerical and Analytical Methods in Geomechanics 43, nr 6 (15.01.2019): 1251–78. http://dx.doi.org/10.1002/nag.2896.

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Dumbser, Michael, i Eleuterio F. Toro. "On Universal Osher-Type Schemes for General Nonlinear Hyperbolic Conservation Laws". Communications in Computational Physics 10, nr 3 (wrzesień 2011): 635–71. http://dx.doi.org/10.4208/cicp.170610.021210a.

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This paper is concerned with a new version of the Osher-Solomon Riemann solver and is based on a numerical integration of the path-dependent dissipation matrix. The resulting scheme is much simpler than the original one and is applicable to general hyperbolic conservation laws, while retaining the attractive features of the original solver: the method is entropy-satisfying, differentiable and complete in the sense that it attributes a different numerical viscosity to each characteristic field, in particular to the intermediate ones, since the full eigenstructure of the underlying hyperbolic system is used. To illustrate the potential of the proposed scheme we show applications to the following hyperbolic conservation laws: Euler equations of compressible gas-dynamics with ideal gas and real gas equation of state, classical and relativistic MHD equations as well as the equations of nonlinear elasticity. To the knowledge of the authors, apart from the Euler equations with ideal gas, an Osher-type scheme has never been devised before for any of these complicated PDE systems. Since our new general Riemann solver can be directly used as a building block of high order finite volume and discontinuous Galerkin schemes we also show the extension to higher order of accuracy and multiple space dimensions in the new framework of PNPM schemes on unstructured meshes recently proposed in [9].

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Sidelle, Alan. "The Answering Machine Paradox". Canadian Journal of Philosophy 21, nr 4 (grudzień 1991): 525–39. http://dx.doi.org/10.1080/00455091.1991.10717260.

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Whatever disagreements analysts of indexical expressions may have, there is nearly universal agreement that the referents of utterances of ‘I,’ ‘here,’ and ‘now’ are, respectively, the utterer, the place of utterance, and the time of utterance. This seems to lead to the result that utterances of ‘I am here now’ are always true (or, if you like, true at the time of utterance). While they do not express necessary truths — no one is essentially at any particular place at any particular time — it looks like they should necessarily express truths; in this, ‘I am here now’ seems to resemble ‘I exist’. And we are sometimes aware of this sort of vacuity in these utterances; the theoretical result meshes well with our everyday experience.

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Dong, Mark, Genevieve Clark, Andrew J. Leenheer, Matthew Zimmermann, Daniel Dominguez, Adrian J. Menssen, David Heim, Gerald Gilbert, Dirk Englund i Matt Eichenfield. "High-speed programmable photonic circuits in a cryogenically compatible, visible–near-infrared 200 mm CMOS architecture". Nature Photonics 16, nr 1 (13.12.2021): 59–65. http://dx.doi.org/10.1038/s41566-021-00903-x.

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AbstractRecent advances in photonic integrated circuits have enabled a new generation of programmable Mach–Zehnder meshes (MZMs) realized by using cascaded Mach–Zehnder interferometers capable of universal linear-optical transformations on N input/output optical modes. MZMs serve critical functions in photonic quantum information processing, quantum-enhanced sensor networks, machine learning and other applications. However, MZM implementations reported to date rely on thermo-optic phase shifters, which limit applications due to slow response times and high power consumption. Here we introduce a large-scale MZM platform made in a 200 mm complementary metal–oxide–semiconductor foundry, which uses aluminium nitride piezo-optomechanical actuators coupled to silicon nitride waveguides, enabling low-loss propagation with phase modulation at greater than 100 MHz in the visible–near-infrared wavelengths. Moreover, the vanishingly low hold-power consumption of the piezo-actuators enables these photonic integrated circuits to operate at cryogenic temperatures, paving the way for a fully integrated device architecture for a range of quantum applications.

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Tu, Shuangzhang, Gordon W. Skelton i Qing Pang. "A Compact High Order Space-Time Method for Conservation Laws". Communications in Computational Physics 9, nr 2 (luty 2011): 441–80. http://dx.doi.org/10.4208/cicp.050309.110510a.

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AbstractThis paper presents a novel high-order space-time method for hyperbolic conservation laws. Two important concepts, the staggered space-time mesh of the space-time conservation element/solution element (CE/SE) method and the local discontinuous basis functions of the space-time discontinuous Galerkin (DG) finite element method, are the two key ingredients of the new scheme. The staggered space-time mesh is constructed using the cell-vertex structure of the underlying spatial mesh. The universal definitions of CEs and SEs are independent of the underlying spatial mesh and thus suitable for arbitrarily unstructured meshes. The solution within each physical time step is updated alternately at the cell level and the vertex level. For this solution updating strategy and the DG ingredient, the new scheme here is termed as the discontinuous Galerkin cell-vertex scheme (DG-CVS). The high order of accuracy is achieved by employing high-order Taylor polynomials as the basis functions inside each SE. The present DG-CVS exhibits many advantageous features such as Riemann-solver-free, high-order accuracy, point-implicitness, compactness, and ease of handling boundary conditions. Several numerical tests including the scalar advection equations and compressible Euler equations will demonstrate the performance of the new method.

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Tian, Ye, Yang Zhao, Shengping Liu, Qiang Li, Wei Wang, Junbo Feng i Jin Guo. "Scalable and compact photonic neural chip with low learning-capability-loss". Nanophotonics 11, nr 2 (22.12.2021): 329–44. http://dx.doi.org/10.1515/nanoph-2021-0521.

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Abstract Photonic computation has garnered huge attention due to its great potential to accelerate artificial neural network tasks at much higher clock rate to digital electronic alternatives. Especially, reconfigurable photonic processor consisting of Mach–Zehnder interferometer (MZI) mesh is promising for photonic matrix multiplier. It is desired to implement high-radix MZI mesh to boost the computation capability. Conventionally, three cascaded MZI meshes (two universal N × N unitary MZI mesh and one diagonal MZI mesh) are needed to express N × N weight matrix with O(N 2) MZIs requirements, which limits scalability seriously. Here, we propose a photonic matrix architecture using the real-part of one nonuniversal N × N unitary MZI mesh to represent the real-value matrix. In the applications like photonic neural network, it probable reduces the required MZIs to O(Nlog2 N) level while pay low cost on learning capability loss. Experimentally, we implement a 4 × 4 photonic neural chip and benchmark its performance in convolutional neural network for handwriting recognition task. Low learning-capability-loss is observed in our 4 × 4 chip compared to its counterpart based on conventional architecture using O(N 2) MZIs. While regarding the optical loss, chip size, power consumption, encoding error, our architecture exhibits all-round superiority.

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Belayneh, T. "INDEXED 3D SCENE LAYERS (I3S) – AN EFFICIENT ENCODING AND STREAMING OGC COMMUNITY STANDARD FOR MASSIVE GEOSPATIAL CONTENT". International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B4-2022 (1.06.2022): 349–55. http://dx.doi.org/10.5194/isprs-archives-xliii-b4-2022-349-2022.

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Abstract. Indexed 3D Scene Layers (I3S), an OGC Community Standard for streaming and storing massive amounts of geospatial content has been rapidly evolving to capture new use cases and techniques to advance geospatial visualization and analysis. I3S enables efficient transmission of various 3D geospatial data types including discrete 3D objects with attributes, integrated surface meshes and point cloud data covering vast geographic areas as well as highly detailed BIM (Building Information Model) content, to web browsers, mobile apps and desktop.In this paper, we will explore multiple evolutions of I3S, including the latest, OGC I3S Version 1.2, that brings dramatic improvements in performance and scalability. We will demonstrate the advantages, including its support for a paged node access pattern, a more compact geometry layout, advanced material definitions property that supports PBR, as well as its support for supercompression of texture data using the Basis Universal SuperCompressed Texture format in KTX™2.0 containers. We will also demonstrate collaborative & research work done to dramatically improve in Basis compressed texture creation in KTX™2.0 container leveraging both the CPU and GPU – contributions that benefit both the geospatial and 3d graphics communities.The paper will conclude by highlighting and documenting various use cases and application, where formats such as I3S are pushing the envelope in geospatial technology – by enabling seamless and ubiquitous access to vast amounts of geospatial data which traditionally have required specialized hardware and software platforms.

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Gasilov, Vladimir Anontol’evich, Aleksey Sergeevich Boldarev, Olga Gourgenovna Olkhovskaya, Dmitri Sergeevich Boykov, Yulia Sergeevna Sharova, Nikita Olegovych Savenko i Alexey Mikhailovich Kotelnikov. "MARPLE: software for multiphysics modelling in continuous media problems". Keldysh Institute Preprints, nr 37 (2023): 1–40. http://dx.doi.org/10.20948/prepr-2023-37.

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The research code MARPLE was originally created to model high-speed dynamic processes caused by the action of high-intensity energy fluxes on matter. At present, it is a universal tool able to solve various continuum mechanics problems. The implemented physical models are the following: single-fluid two-temperature MHD model of plasma dynamics, including electron-ion energy exchange and generalized Ohm's law; model of electrical and thermal conductivity taking into account the anisotropy in the magnetic field; radiative heat transfer: models pertinent to optically thin as well as optically thick media: techniques for taking into account radiative cooling losses, spectral multigroup diffusion transfer, laser radiation propagation etc.; model of multicomponent flow. Calculations are performed using wide-range equations of state, transport and optical data. The MARPLE code utilises modern computational technologies based on block structured and unstructured meshes consisting of tetrahedral, hexahedral, prismatic elements and their combinations. The solvers implement conservation laws using high-resolution techniques. We apply the physical splitting to solve the governing system. The object-oriented approach to software design is used, as well as methods of object and generic programming (C++ implementation language). Design of computational domains is provided by means of integrated SALOME open source CAD-CAE system. Marple works as MPI application for modern HPC systems. The paper presents examples of problems in plasma dynamics, magnetohydrodynamics, astrophysics, and solid thermomechanics solved by means of the MARPLE code.

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Tsai, Shao-Pu, Peter J. Konijnenberg, Ivan Gonzalez, Samuel Hartke, Thomas A. Griffiths, Michael Herbig, Kaori Kawano-Miyata, Akira Taniyama, Naoyuki Sano i Stefan Zaefferer. "Development of a new, fully automated system for electron backscatter diffraction (EBSD)-based large volume three-dimensional microstructure mapping using serial sectioning by mechanical polishing, and its application to the analysis of special boundaries in 316L stainless steel". Review of Scientific Instruments 93, nr 9 (1.09.2022): 093707. http://dx.doi.org/10.1063/5.0087945.

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We report the development of a fully automatic large-volume 3D electron backscatter diffraction (EBSD) system (ELAVO 3D), consisting of a scanning electron microscope (ZEISS crossbeam XB 1540) with a dedicated sample holder, an adapted polishing automaton (Saphir X-change, QATM), a collaborative robotic arm (Universal Robots UR5), and several in-house built devices. The whole system is orchestrated by an in-house designed software, which is also able to track the process and report errors. Except for the case of error, the system runs without any user interference. For the measurement of removal thickness, the samples are featured with markers put on the perpendicular lateral surface, cut by plasma focused ion beam (PFIB) milling. The individual effects of both 1 μm diamond suspension and oxide polishing suspension polishing were studied in detail. Coherent twin grain boundaries (GBs) were used as an internal standard to check the removal rates measured by the side markers. The two methods for Z-spacing measurements disagreed by about 10%, and the inaccurate calibration of the PFIB system was found to be the most probable reason for this discrepancy. The angular accuracy of the system was determined to be ∼2.5°, which can be significantly improved with more accurate Z-spacing measurements. When reconstructed grain boundary meshes are sufficiently smoothed, an angular resolution of ±4° is achieved. In a 3D EBSD dataset of a size of 587 × 476 × 72 μm3, we focused on the investigation of coincidence site lattice ∑9 GBs. While bearing predominantly a pure tilt character, ∑9 GBs can be categorized into three groups based on correlative 3D morphologies and crystallography.

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Lima, B. K., A. L. M. Mota, N. J. C. Sena, D. M. De Paula, M. E. M. Moura i V. P. Feitosa. "Análise das Propriedades Químicas de Adesivos Universais Foto-Polimerizados por Diferentes Tempos". Journal of Health Sciences 19, nr 5 (23.02.2018): 67. http://dx.doi.org/10.17921/2447-8938.2017v19n5p67.

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O objetivo foi avaliar as propriedades químicas de três adesivos universais com 20 e 40s de foto-polimerização. Para isso, foram confeccionados discos (1x6mm) ao dispensar os sistemas adesivos em moldes de silicone pré-fabricados. Os adesivos Ambar Universal (FGM), Ybond Universal (Yller) e Singlebond Universal (3M) foram foto-polimerizados por 20s de acordo com os fabricantes ou por maior tempo (40s). Os espécimes foram submetidos aos testes de sorção (Wsp) e solubilidade (Wsol) de acordo com as normas da ISO 4049-2009 inicial e após 6 meses. O grau de conversão (GC) foi analisado por espectroscopia micro-Raman através da relação entre as vibrações das duplas ligações carbono-carbono aromática/alifática nas frequências 1635/1608cm-1 dos adesivos antes e após a polimerização. Os dados foram analisados com ANOVA e teste de Tukey (p<0,05). Somente o Ybond Universal apresentou diminuição da Wsp com o aumento do tempo de polimerização (p0,004). Ybond Universal 20s obteve os maiores valores de solubilidade tanto imediato (246,5±71,2 µg/mm³), quanto em 6 meses (410,3±93,6 µg/mm³) e também foi o único que mostrou diferença estatística com a mudança do tempo de polimerização tanto imediato (p0,005), quanto em 6 meses (p<0,001). Já os resultados do GC mostraram que o tempo de 40 seg de fotopolimerização não aumentou o grau de conversão, exceto para o Singlebond Universal (p0,025). Como conclusão, é observado que com o aumento do tempo de fotopolimerização, o Ybond Universal melhora suas propriedades de Wsp e Wsol e o Singlebond Universal aumenta a polimerização.Palavras-chave: Polimerização. Adesivo. Sorção de Água.

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Mo, An, i Wenzeng Zhang. "A novel universal gripper based on meshed pin array". International Journal of Advanced Robotic Systems 16, nr 2 (1.03.2019): 172988141983478. http://dx.doi.org/10.1177/1729881419834781.

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Conventional grippers are designed for specific applications. They often encounter difficulties when grasping different objects in unstructured environments. This article introduces a novel gripper to challenge the universal grasp capability. Passively slidable pins are array arranged in the gripper. By meshing of pin’s elliptical contour, shape adaption to various objects is achieved in both vertical and horizontal directions using a single motor. Contact force is analyzed based on static and kinetic friction. Kinematic simulation on the grasping process reveals the interaction between critical parameters and the overall grasp performance. To conclude, a prototype pin array gripper demonstrates high adaptability to various objects in real-world testing.

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Carvalho, Andreia Assis, Pável Fernando Quadé, Francisco Antonio Uchoa-Junior, Amanda Pedrosa Oliveira, Tainah Costa Firmiano, Lawrence Gonzaga Lopes i Terezinha Jesus Esteves Barata. "Desempenho clínico dos sistemas adesivos universais: revisão crítica". Revista da Faculdade de Odontologia de Lins 30, nr 1-2 (28.12.2020): 17–29. http://dx.doi.org/10.15600/2238-1236/fol.v30n1p17-29.

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Objetivo: Analisar e discutir, por meio de uma revisão crítica da literatura, o comportamento clínico dos sistemas adesivos odontológicos “universal” ou “multimodo”. Métodos: A pesquisa bibliográfica foi restrita às bases de dados eletrônicas: MEDLINE e SciELO, utilizando os seguintes filtros: data de publicação [2014-2019], língua [portuguesa e/ou inglesa], descritores e suas combinações: “Universal adhesive”; “Multimode adhesive”; “Adesivos e Universal”; “Adesivos dentinários e Universal”; “Adesivos dentários e Universal”. Os seguintes critérios de inclusão foram adotados: estudos clínicos, dentição permanente, modos de aplicação, restaurações diretas e resinas compostas. Resultados: Dos 317 artigos identificados, 18 destes foram incluídos na análise sendo que o período de acompanhamento clínico variou entre 6 semanas e 36 meses. Conclusão: Considerando os estudos analisados de curto período de acompanhamento clínico, pode-se afirmar que os sistemas adesivos universais: (1) podem ser utilizados em dentes permanentes, a serem restaurados utilizando resina composta; (2) não devem ser aplicados sobre exposições pulpares diretas; (3) devem ser aplicados preferencialmente nos casos clínicos de procedimentos restauradores de Lesões Cervicais não Cariosas no modo Condicionamento Ácido Total ou Condicionamento Seletivo em Esmalte e no modo Condicionamento Seletivo em Esmalte nos casos de lesões cariosas.

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Follak, A. C., T. L. Lenzi, R. O. Rocha i F. Z. M. Soares. "Performance in vitro de Sistemas Adesivos Universais em Dentina Hígida e Afetada: 1 Ano de Envelhecimento". Journal of Health Sciences 19, nr 5 (23.02.2018): 21. http://dx.doi.org/10.17921/2447-8938.2017v19n5p21.

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O objetivo do estudo foi avaliar a longevidade da união de adesivos universais, em ambas estratégias (com ou sem condicionamento ácido - ER e SE), em dentina hígida (SND) e afetada (CAD). Superfícies planas em dentina obtidas de 112 incisivos bovinos hígidos foram distribuídas em 16 grupos experimentais (n7), de acordo com: substrato (SND ou CAD – ciclagem de pH, 14 dias) adesivo (Single Bond Universal - SU, All Bond Universal - AB, Prime & Bond Elect - PB, Adper Single Bond 2 - SB e Clearfil SE Bond - CS) e estratégia (“etch and rinse”- ER ou “self etch”- SE). Após aplicação dos adesivos, blocos de resina foram confeccionados. Após 24 h (água destilada 37 ºC), os dentes foram seccionados em “palitos” (0,8 mm2), submetidos ao teste de microtração imediatamente, após 6 meses e 1 ano de armazenamento. Os dados (MPa) foram submetidos separadamente para cada substrato (SND e CAD) à ANOVA de 3 fatores e teste de Tukey (a5%). A interação tripla foi significante em ambos substratos (SND: p0,000 e CAD: p0,007). Em SND, não houve diferença entre as estratégias, independentemente do tempo. Valores significantemente menores foram observados já em 6 meses para o sistema AB em ER e após 1 ano para PB em ER e SU em ER. Em CAD, as estratégias também foram similares, porém a maioria dos sistemas apresentaram redução significativa nos valores já após 6 meses, exceto PB em SE que não apresentou diferença após 1 ano. A longevidade da união dos adesivos universais em SND é maior na estratégia SE. Em CAD a degradação é mais rápida e nenhum dos adesivos foi capaz de manter a longevidade da união. Apoio: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Palavras-chave: Adesivos Dentinários. Dentina. Resistência a Tração.

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Burganova, Maria, i Julia Smolenkova. "Alexander Burganov: a New Code of Time and Space". Scientific and analytical journal Burganov House. The space of culture 16, nr 1 (10.03.2020): 19–37. http://dx.doi.org/10.36340/2071-6818-2020-16-1-19-37.

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Summary: The article is devoted to the analysis of the work of Alexander Burganov, an outstanding contemporary sculptor and graphic artist. The study of the categories of Space and Time on the example of his works is the main theme of the article. The author believes that Time and Space in Burganov’s work are unique categories and correspond to reality least of all; the author gives examples of specific works and convinces that Burganov has modeled a bright, recognizable, unique personal code with the help of sculptures, graphic works, texts, installations, and artistic gestures. Today, this is especially noticeable as the culture of the 21st century has sharpened and almost brought to a logical conclusion the awareness of artistic being, formed in the second half of the 20th century, and is now on the verge of new creative realities leading to conceptual discoveries in art. The author believes that the artist keenly captures the invisible waves emitted by the developing cultures and subcultures of the 21st century, in which a body devoid of naturalistic sensuality is coldly and symbolically akin to antique statues. The author pays great attention to the analysis of new materials in Burganov’s creative work, believing that the 21st century has brought great changes not only to the form but also to the substance of the bodies of statues and sculptural compositions. Marble is replaced with plastic, bronze coexists with gypsum, metal meshes surround voids and follow the movements of the wind. Paper on an iron frame is a rightful hero of this “Olympus”. It should be noted that there is no place for imitation. New material dictates its conditions for shaping and participates in the interpretation of a new image.Analyzing the contemporary space of culture, the author states that the experiences of European crises have brought into art restraint and minimalism, democracy and the idea of some kind of universal permissiveness in creating and judging art. However, the predominance of mass culture, which received a completely new face and opportunity owing to the virtual space spilled over reality, was the main marker of the culture of the early 21st century. Today, a mixture of styles and cultures, a combination of incongruous is a new reality introduced into our lives by virtual culture. The author emphasizes that it was this invisible space that Alexander Burganov could feel and has reflected in his work. This has made his works relevant and understandable to a new generation which almost does not feel the classics. The author concludes that Alexander Burganov’s work has become a kind of bridge connecting the worlds of classics and modernity, high and grassroots culture, myths and reality.

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Yang, Fuqin, Xin Liu, Shun Zhao i Linlin Sun. "Fluid-solid coupling characteristics analysis for tripod sliding universal joints". Mechanics & Industry 20, nr 2 (2019): 201. http://dx.doi.org/10.1051/meca/2019001.

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Fluid-solid coupling theory is introduced into tripod sliding universal joint design. The geometric models of the tripod sliding universal joint and lubricant film are established respectively and meshed. Fluid-solid coupling analyses of tripod sliding universal joints in unidirectional and bidirectional scenarios are performed to investigate sleeve and lubricant film coupling as well as sliding pin and lubricant film coupling under various differential pressures and frequencies. In the condition of unidirectional and bidirectional coupling, sleeve and sliding pin deformation and stress increase gradually with differential pressure and frequency. Under various differential pressures and frequencies, tripod sliding universal joint bidirectional coupling deformation and stress are greater than those of unidirectional coupling. The theory of fluid-solid coupling is combined with the tripod sliding universal joint for the first time in this paper. The fluid-solid coupling analysis results are of great significance and benefit to the design, application and marketing of tripod sliding universal joints.

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Pires, Lilian Gomes Soares. "Influência da aplicação do laser de ND: yag na durabilidade de adesão de um sistema adesivo universal à dentina humana". Brazilian Journal of Health Review 6, nr 4 (12.07.2023): 14788–801. http://dx.doi.org/10.34119/bjhrv6n4-065.

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Pesquisas sobre pré-tratamento da dentina têm sido desenvolvidas a fim de minimizar os efeitos da degradação da interface adesiva e aumentar a longevidade da adesão. A irradiação com laser Neodmiyum: ítrio-aliminum granada (Nd:YAG) promove alterações morfológicas e estruturais na dentina que podem favorecer a estabilidade da resistência de união ao longo do tempo. Este trabalho visou avaliar, in vitro, o efeito do uso do laser de Nd:YAG na resistência de união (RU), imediata e em longo prazo, bem como modo de falha (MF), de um sistema adesivo universal (SAU) à dentina humana, aplicado no método convencional e autocondicionante. Trinta e dois terceiros molares humanos hígidos tiveram suas porções oclusais removidas para exposição da dentina e foram aleatoriamente divididos em 4 grupos (n=8), de acordo com modo de aplicação do SAU (Single Bond Universal, 3M ESPE), autocondicionante ou convencional, e da irradiação da superfície com laser de Nd:YAG (100mJ/10Hz) ou não (controle). As superfícies de dentina foram restauradas com resina composta (FiltekTM Z350 XT, 3M ESPE). Após 24 hs, os blocos dentina-resina foram seccionados em amostras em forma de “palitos” (1mm2 de área adesiva), os quais foram aleatoriamente divididos conforme o tempo de armazenamento em água (AA) após restauração: 24 horas e seis meses. Os palitos foram submetidos ao teste de microtração em máquina universal de ensaio com velocidade de 0.5mm/min. A análise do MF foi realizada por meio de um esteromicroscópio (30x). Os resultados de RU (MPa) foram submetidos ao teste de ANOVA a três critérios (a= 0,05) e os dados de MF a estatística descritiva (%). Não houve interação tripla significativa entre os fatores em estudo (p = 0,603). A irradiação com Nd:YAG resultou em valores significativamente maiores de RU (p = 0,031), independente do modo de aplicação de SAU ou tempo de AA. RU foi estatisticamente semelhante quando SAU foi empregado no modo convencional ou autocondicionante (p < 0,001), tenha sido irradiada ou não a dentina, tanto no tempo 24 horas quanto após 6 meses de AA. A RU foi significativamente reduzida após 6 meses de armazenamento (p = 0,007), independentemente se a dentina foi ou não irradiada e da forma pela qual o sistema adesivo universal foi aplicado. Houve predomínio de falhas adesivas em todos os grupos. Conclui-se que o laser de Nd:YAG afetou positivamente a resistência de união do sistema adesivo universal, independente de seu modo de aplicação, à dentina. No entanto, sua aplicação à dentina não promoveu estabilidade da união ao longo dos 6 meses de armazenamento em água.

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Zulaika Hernández, Josu M. "Los nombres vascos de los meses en una obra de 1621: "Fábrica universal y admirable de la composición del Mundo"". Euskera ikerketa aldizkaria 3, nr 56 (30.10.2012): 873–904. http://dx.doi.org/10.59866/eia.v3i56.205.

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En 1621, el médico aragonés Ardevines incluyó los nombres vascos de los meses en su obra Fabrica universal, que se constituye así en el tercer libro impreso en el que aquellos aparecen reproducidos. Ardevines acompañó a la transcripción de algunos de los meses la etimología, bastante fundada, de los mismos. Ignoramos cuál pudo ser la fuente de Ardevines, ni si esta fue una mera comunicación oral o alguna obra hoy desaparecida. Pero, en cualquier caso, parece claro que el autor intelectual de este prácticamente desconocido listado hubo de ser alguien con un muy correcto dominio del euskara.

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Ilha, B. D., T. L. Lenzi, R. O. Rocha i F. Z. M. Soares. "Longevidade da União de um Adesivo Universal ao Esmalte Hígido, Erodido e Desmineralizado". Journal of Health Sciences 19, nr 5 (23.02.2018): 22. http://dx.doi.org/10.17921/2447-8938.2017v19n5p22.

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O objetivo deste estudo foi avaliar a resistência de união ao esmalte (RU) imediata e após 6 meses, do adesivo Single Bond universal (3M-Espe) aplicado nas duas estratégias, ao esmalte hígido (HIG), desmineralizado (DES) e erodido (ERO). Foram utilizados 60 incisivos bovinos hígidos, divididos aleatoriamente em 6 grupos experimentais (n10) de acordo com o substrato: HIG, DES (ciclagem de pH) e ERO (imersão em refrigerante de cola) e estratégia de aplicação: com condicionamento ácido (ER) ou autocondicionante (SE). Após a aplicação do adesivo, tubos de amido foram posicionados sobre a superfície de esmalte, individualmente fotopolimerizados e em seguida preenchidos com resina composta totalizando 6 espécimes por dente. Os corpos de prova foram armazenados em água destilada em estufa a 37°C por 24h. Dois espécimes de cada dente foram submetidos ao ensaio de microcisalhamento imediatamente e dois após 6 meses de armazenamento. Os valores de RU (Mpa) foram submetidos à ANOVA-3 fatores (substrato, estratégia e tempo) e teste Tukey (a0,05). Os fatores isolados “substrato” (p0,000) e “estratégia” (p0,021), bem como sua interação (p0,008), foram significantes. Os valores de RU apresentaram a seguinte ordem decrescente: ERO>HIG>DES tendo a estratégia ER apresentado valores significantemente maiores. O esmalte desmineralizado reduz a adesão do sistema adesivo Single Bond Universal, já o erodido não compromete a adesão. O condicionamento ácido prévio à aplicação do adesivo resulta em maior adesão.Palavras-chave: Colagem Dentária. Esmalte Dentário. Resistência ao Cisalhamento.

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Sigal, Tamara, i Diego Terceiro. "Incorporación de segunda dosis de la vacuna de la varicela al Calendario Nacional de Vacunación de Argentina". Evidencia, actualizacion en la práctica ambulatoria 24, nr 4 (28.12.2021): e002147. http://dx.doi.org/10.51987/evidencia.v25i1.6993.

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A partir de 2022, a la dosis de vacuna contra la varicela contemplada a los 15 meses de edad en el Calendario Nacional de Vacunación de Argentina, se suma una segunda dosis al ingreso escolar. En este artículo se repasan los aspectos clave para la implementación de esta práctica de inmunización universal, gratuita y obligatoria.

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Bueno, Renato Cândido, Luiz Gonsaga de Carvalho, Rubens Leite Vianello i João José Granate de Sá e. Melo Marques. "Estudo de rajadas de ventos e direções predominantes em Lavras, Minas Gerais, por meio da distribuição gama". Ciência e Agrotecnologia 35, nr 4 (sierpień 2011): 789–96. http://dx.doi.org/10.1590/s1413-70542011000400019.

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O presente trabalho foi conduzido com o objetivo de estudar as probabilidades de ocorrência de ventos extremos e suas direções predominantes para a região de Lavras, MG. Foram usados os dados registrados pelo anemógrafo universal da Estação Climatológica Principal de Lavras, situada no campus da Universidade Federal de Lavras. Com os dados disponíveis (139 meses), no período de janeiro de 1988 a maio de 2004, verificou-se o ajuste à distribuição Gama pelo teste de χ² a 5% de probabilidade. Foram estimadas probabilidades de ocorrência de velocidades máximas diárias de vento iguais ou superiores a 10, 20, 30, 40, 50, 60, 70, 80, 90 e 100 km h-1, para cada mês. Verificou-se que os meses de setembro a fevereiro apresentaram ventos fortes, com probabilidades de ocorrência superiores as dos outros meses. Para ventos bastante fortes acima de 100 km h-1, as probabilidades de ocorrência são mínimas para todos os meses do ano. Quanto à direção para as rajadas de ventos, observou-se predominância das direções leste e oeste em relação às demais.

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Machado, Nárli Pereira, Renato Oliveira Alves, Cynthia Ribeiro do Nascimento, Aline Moreira Lucena, Patrícia Reis Ferreira, Erika Parlato-Oliveira i Sirley Alves da Silva Carvalho. "Investigação do reconhecimento do próprio nome em bebês de 4 a 5 meses: estudo piloto". Revista CEFAC 15, nr 5 (październik 2013): 1080–87. http://dx.doi.org/10.1590/s1516-18462013000500004.

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OBJETIVO: verificar se as crianças na faixa etária entre quatro e cinco meses reconhecem o próprio nome. MÉTODO: estudo transversal, realizado com 16 bebês com idade entre quatro e cinco meses, avaliados pelo programa Estadual de Triagem Auditiva Neonatal Universal (TANU) no Ambulatório de Fonoaudiologia do Hospital das Clínicas da Universidade Federal de Minas Gerais (HC-UFMG). Foram realizadas avaliações auditiva e de linguagem, além do teste de reconhecimento do próprio nome. Realizou-se análise descritiva das variáveis utilizadas no estudo e análise estatística. As variáveis contínuas foram comparadas por meio do teste T pareado e considerou-se nível de significância de 5% e coeficiente de confiança de 95%. RESULTADOS: verificou-se predominância das respostas dos bebês à evocação do próprio nome, na maioria dos bebês avaliados. CONCLUSÕES: com base nos critérios utilizados neste estudo, entre quatro e cinco meses as crianças já são capazes de reconhecer seu próprio nome.

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Balamuralikrishnan, R., A. S. H. Al-Mawaali, M. Y. Y. Al-Yaarubi, B. B. Al-Mukhaini i Asima Kaleem. "Seismic Upgradation of RC Beams Strengthened with Externally Bonded Spent Catalyst Based Ferrocement Laminates". HighTech and Innovation Journal 4, nr 1 (1.03.2023): 189–209. http://dx.doi.org/10.28991/hij-2023-04-01-013.

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Globally, since there are more systems of civil infrastructure, there are also more degraded buildings and structures. If upgrading or strengthening is a practical option, complete replacement is likely to be an escalating financial burden and may be a waste of natural resources. It is necessary to repair or strengthen a number of reinforced concrete buildings and structures in order to boost their load-bearing capabilities or improve their ductility under seismic stress. Additionally, due to changes in service circumstances, a structure might need to be modified to reduce deflections or manage cracking. Strengthening may be preferable to limiting usage, capping applied loads, and regularly inspecting the structure rather than removing the existing structure or part and building a new one. This study aims to examine the flexural, shear, and combined effect of flexural and shear behavior of reinforced concrete (RC) beams strengthened with externally bonded spent catalyst-based ferrocement laminates and compare them to the control beams (unstrengthened) under two-point loading conditions. This study involves researching laminates with various spent catalyst doses, such as 3, 6, 9, and 12%, in an effort to determine the best amounts that will improve the structural performance of ferrocement laminates. Twelve spent catalyst-based ferrocement laminates measuring 500(L) × 125(B) × 20 mm (thickness) with 3% volume fraction of meshes each were cast and tested in the lab as part of the preliminary investigation. For repeatability, three laminates per case were employed. Eight numbers of under-reinforced RC beams measuring 75(L) × 100(B) × 150(D) mm were cast for the main study; six numbers were strengthened with optimized spent catalyst-based ferrocement laminates bonded with flexible epoxy systems at the tension zone, shear zone, and combination of tension and shear zone. Two of the beams were cast as control specimens. The beams were then evaluated using a Universal Testing Machine (UTM) with a 1000 kN capacity under two-point loading conditions. As a result, the strength, yield load, ultimate load, stiffness, ductility, and related failure modes of all tested beams' flexural and shear performances were examined. According to a preliminary analysis of laminates made of spent catalyst, the dosage of 9% provides good flexural strength in comparison to other doses. In comparison to the strengthened beam, the control beam's initial cracks appeared earlier. In comparison to the control beam, the strengthened beam has an increase in load-carrying capacity of 18% for flexure, 16% for shear, and 30% for the combined impact of flexure and shear. In comparison to the control beam, the deflection of the strengthened beam was decreased by close to 20 to 40% for flexure, 10 to 30% for shear, and 15 to 20% for the combined effects of flexure and shear at the same load level. In relation to control beams, the ductility also improved up to 30% for flexure, 25% for shear, and 25% for the combined impact of flexure and shear. Similar to this, the retrofitted beam is stiffer than the control beam by approximately 40% for flexure, 48% for shear, and 30% for the combined effect of flexure and shear. Theoretical formulation by section analysis is also derived and it gives close agreement with control and strengthened beams. The flexural and shear strengthening of the RC beam retrofitting system is effectively increased by using spent catalyst-based ferrocement laminates. No beam showed signs of premature and brittle failure. According to the test findings, it can be said that spent catalyst-based ferrocement reinforced beams perform better in every way than control beams. Doi: 10.28991/HIJ-2023-04-01-013 Full Text: PDF

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Corres, María Elisa, i Mariana Butinof. "Características epidemiológicas y factores asociados a la evolución de coqueluche en menores de un año, en la ciudad de Córdoba, Argentina." Revista de Salud Pública 23, nr 2 (5.07.2019): 40–52. http://dx.doi.org/10.31052/1853.1180.v23.n2.21373.

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Coqueluche es una enfermedad respiratoria de alto impacto sanitario en población infantil. Objetivo: Describir patrón epidemiológico, factores de riesgo asociados a ocurrencia y evolución en niños <1 año, atendidos en el Hospital Infantil Municipal de la Ciudad de Córdoba (2007-2010). Metodología: estudio observacional, descriptivo correlacional, pacientes <1 año con diagnóstico de coqueluche confirmado por laboratorio (n=60). Resultados: mediana de edad: 2 meses, 95% fueron <6 meses, 66,6% requirió internación (probabilidad de internación fue 8 veces mayor para los <2 meses). Un 72,5% adquirió la enfermedad en entorno familiar, 53% de los niños presentó carné de vacunación completo. El 15% bajo peso al nacer, 27,5% prematuros y 40% de madres adolescentes. Todos presentaron tos, 80% síntomas catarrales, 75% tos paroxística, 78,3% cianosis y 23,3% apnea. Leucocitosis elevada en 20%. La gravedad se asoció a estacionalidad, leucocitosis y síntomas catarrales. Conclusiones: La cobertura vacunal universal es la base de la prevención.

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Volkow Fernández, Patricia, Alexandra Martín-Onraet, Alicia Piñeirua-Menéndez, Diana Perales-Martínez, Raúl Ortega-Pérez, Alejandro Barrera-García i Juan Sierra-Madero. "Mortalidad hospitalaria en pacientes con infección por VIH: a diez años del acceso universal a TARAA en México". Salud Pública de México 57 (5.03.2014): 163. http://dx.doi.org/10.21149/spm.v57s2.7605.

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Objetivo. Establecer las características y causas de muerte de pacientes VIH positivos que fallecen al estar hospitalizados. Material y métodos. Se incluyeron pacientes VIH positivos que fallecieron durante la hospitalización entre 2010 y 2013. Se recabaron datos sociodemográficos y clínicos, causas de muerte y muertes prevenibles. Se consideraron prevenibles aquellas muertes en pacientes con menos de seis meses de terapia antirretroviral altamente activa (TARAA) o sin tratamiento y con menos de 350 CD4+ al momento del diagnóstico o del internamiento, con o sin enfermedades oportunistas. Resultados. Se identificaron 128 muertes. La mediana de CD4+ fue 47 cels/mm3; 18% llegó al internamiento sin diagnóstico de VIH, 51% tenía menos de seis meses de haber sido diagnosticado y 40.5% no había recibido TARAA. Las principales causas de muerte fueron eventos definitorios de sida (65.6%). Se identificaron 70 muertes prevenibles (57%). Conclusión. A pesar del acceso universal a TARAA, en México los pacientes VIH positivos siguen falleciendo por eventos relacionados con sida, que es un indicador de diagnóstico tardío del VIH. Es urgente implementar programas de detección temprana para hacer accesible el beneficio de la TARAA.

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Benito Orejas, José I., Beatriz Ramírez Cano, Darío Morais Pérez, José L. Fernández-Calvo i Ana Almaraz Gómez. "Resultados de aplicar durante 42 meses un protocolo universal de detección e intervención precoz de la hipoacusia en neonatos". Acta Otorrinolaringológica Española 59, nr 3 (marzec 2008): 96–101. http://dx.doi.org/10.1016/s0001-6519(08)73274-6.

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Corrêa, Edvania Aparecida, Isabel Cristina Moraes, Sergio Dos Anjos Ferreira Pinto i Cenira Maria Lupinacci. "Perdas de Solo, Razão de Perdas de Solo e Fator Cobertura e Manejo da Cultura de Cana-de-Açúcar: Primeira Aproximação". Geography Department University of Sao Paulo 32 (27.12.2016): 72. http://dx.doi.org/10.11606/rdg.v32i0.116671.

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O objetivo desse artigo é discutir a questão da erosão em áreas de cultivo de cana de açúcar. Assim, foram determinadas as perdas de solo, a razão de perdas de solo (RPS) e os valores do fator cobertura e manejo (fator C) da Equação Universal de Perdas de solo (Universal Soil Loss Equation - USLE) para a cultura de cana-de-açúcar, cultivada em solos arenosos e argilosos e em diferentes condições de relevo e de manejo. Para obter dados visando atingir tal objetivo, foram utilizadas técnicas experimentais, com a instalação de 8 parcelas de monitoramento de erosão hídrica do solo (2x10 metros). Durante um ano agrícola foram coletadas amostras de água e sedimento, sendo realizada a quantificação do material erodido. Nas parcelas instaladas em Cambissolos Háplicos de textura areia franca/franco arenosa, declividades de 12% e 15% e cultivadas com cana planta sob preparo convencional, as perdas foram de 49 e 84 t-1 ha-1 ano respectivamente e o fator C médio foi de 0,424. Nas parcelas instaladas em Argissolo Vermelho Amarelo, com declive de 5% e em Cambissolo Háplico, com declive de 11%, ambos de textura argilosa e cultivados com cana soca de 3° corte sob plantio direto, as perdas foram de 0,797 e 3,684 t-1 ha-1 ano e o fator C de 0,234 e 0,130 respectivamente. Os valores de RPS variaram de 0,393 a 0,521 (do plantio até 3 meses) e de 0,051 a 0,449 (período de 10 a 12 meses) nos solos arenosos, e de 0,081 a 1,109 (plantio até 3 meses) e de 0,041 a 0,069 (10 a 12 meses) nos solos argilosos. Os diferentes tipos de solos, relevo e manejo presentes nas parcelas resultaram em valores de perdas, RPS e Fator C discrepantes. Neste sentido, tem-se a necessidade de maior atenção à variabilidade e à sensibilidade destes parâmetros na modelagem de perdas de solo por erosão hídrica em áreas cultivadas com cana-de-açúcar.

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Berthier Brasil, Albert Vincent, i Arthur de Azambuja Pereira Filho. "Achatamento das fraturas tóraco-lombares em explosão após técnica de instrumentação longa e fusão curta. A instrumentação universal pode oferecer alguma vantagem?" Arquivos Brasileiros de Neurocirurgia: Brazilian Neurosurgery 25, nr 03 (wrzesień 2006): 112–18. http://dx.doi.org/10.1055/s-0038-1625492.

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Resumo Objetivo: Uma das alternativas para o tratamento cirúrgico das fraturas tóraco-lombares em explosão (TLBF) é a técnica de instrumentação longa e fusão curta (RLFS) utilizando o sistema de Harrington. A altura do corpo vertebral fraturado geralmente retorna a valores próximos do normal imediatamente após a cirurgia, mas, alguns meses depois, esse ganho é perdido (achatamento). Nosso objetivo é verificar os resultados clínicos e radiológicos com a técnica RLFS com sistema de instrumentação universal. Método: Doze casos de TLBF (masculino/feminino=9/3, média de idade=35,7 anos, Escala de Frankel: E=9, C=3) foram estudados. Através de abordagem posterior, instrumentação universal foi realizada dois níveis acima e dois níveis abaixo da vértebra fraturada. Enxerto ósseo foi colocado de um nível acima a um nível abaixo da fratura. Após pelo menos nove meses, o instrumental localizado além da área enxertada foi removido. Os resultados clínicos foram medidos pela Escala de Frankel e pelo formulário SF-36. Os parâmetros radiológicos (ângulo de Cobb, alturas anterior e posterior da vértebra fraturada) foram medidos em 3 momentos: pré-operatório, pós-operatório imediato e após a remoção do instrumental. Análise estatística foi realizada por análise de variância – ANOVA (α=0.05) e teste ̈r̈ de Pearson (p<0.05). Resultado: Não se observou piora neurológica. Todos os pacientes com lesão neurológica, exceto um deles, melhoraram um grau na escala de Frankel. Os parâmetros radiográficos melhoraram após a primeira cirurgia, mas o ganho reduziu após a remoção do material. A cifose pós-operatória interferiu negativamente na qualidade de vida dos pacientes. Conclusão: Quando a técnica RLFS é escolhida para tratar uma TLBF, o uso de instrumentação universal não mostra nenhuma vantagem sobre o sistema de Harrington em termos de resultados clínicos e radiológicos.

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Samalvides Cuba, Frine, i Claudia Banda Flores. "Sífilis en la gestación". Revista Peruana de Ginecología y Obstetricia 56, nr 3 (23.04.2015): 202–8. http://dx.doi.org/10.31403/rpgo.v56i224.

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La sífilis es una enfermedad de transmisión sexual, producida por Treponema pallidum, que compromete múltiples sistemas. Puede ser adquirida o congénita y presentarse en diferentes estadios de evolución. Esta enfermedad tiene impacto en la salud de la mujer gestante y el feto, por lo cual debe realizarse el tamizaje universal. Las manifestaciones clínicas son proteiformes, dependiendo del estadio clínico, y el diagnóstico se realiza por medio de pruebas no treponémicas y treponémicas. El estándar de oro del tratamiento es la penicilina; en pacientes alérgicas debe realizarse la prueba de desensibilización, debido a que los fármacos alternativos no han demostrado beneficio en la mujer gestante. El seguimiento se realiza con pruebas no treponémicas y se espera caída de los títulos, en cuatro veces su valor inicial a los seis meses y negativización a los 12 a 24 meses.

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Pereira, Fernanda Linhares. "América Latina, Direitos Humanos e Guerra Fria: uma análise da escrita da Declaração Universal dos Direitos Humanos". Revista Eletrônica da ANPHLAC, nr 025 (26.01.2019): 252–74. http://dx.doi.org/10.46752/anphlac.025.2018.2909.

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Diferentemente do difundido pela historiografia tradicional dos direitos humanos, os países da América Latina apresentaram uma atuação importante e, por que não dizer, fundamental no processo de elaboração da Declaração Universal. Desde 1945, os representantes desses países já faziam campanha e pressionavam as grandes potências para que questões relativas aos direitos humanos fossem incluídas na Carta das Nações Unidas. Naquele momento, os direitos humanos não eram o objetivo central das Nações Unidas, mas vieram a futuramente se tornar o projeto mais importante graças à participação de países menores e, sobretudo, dos latino-americanos. No decorrer do processo de escrita da Declaração, entre os anos de 1945 a 1948, os representantes da América Latina na Comissão de Direitos Humanos foram decisivos para que a declaração contivesse direitos sociais, econômicos e culturais em sua primeira versão. Além dessas contribuições, a Declaração de Bogotá, promulgada por esses países, alguns meses antes da publicação da Declaração Universal, tendo surgido dessa mesma tradição de direitos, serviu como um modelo para a redação da própria Declaração Universal dos Direitos Humanos. Assim sendo, essas interessantes e pontuais participações, ainda pouco exploradas pelos historiadores, serão o foco de discussão deste artigo.

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Javela Rugeles, Julian David, Camilo Ernesto Ospino Bermúdez i Leonel Javela Perez. "Crecimiento del recién nacido prematuro durante su primer año de vida en programa madre canguro". Pediatría 52, nr 2 (20.06.2019): 24–30. http://dx.doi.org/10.14295/p.v52i2.116.

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Introducción: En los recién nacidos a término la recomendación universal es de que alimentados con leche materna exclusiva durante los primeros 6 meses de vida, sin embargo, con los prematuros no hay un acuerdo en la indicación de la lactancia; por considerarse que la leche materna sola no es suficiente. Numerosos estudios promueven el uso de fórmulas infantiles en prematuros, dado que se plantea que el prematuro debe mantener el mismo crecimiento como si estuvieran aún in utero.Métodos: Estudio de cohorte, se analizaron las historias clínicas de pacientes de los recién nacidos prematuros, que completaron el año de seguimiento en el programa madre canguro ambulatorio en el periodo comprendido entre 2006 a 2014. Se calcularon medidas de tendencia central y dispersión para las variables continuas, se aplicaron pruebas de confianza estadística.Resultados: Se obtuvo información de 90 prematuros; predominio de prematuro tardío (77%). El 16% de los bebés pesaron < 1500 gramos. Se encontró significancia estadística para el aumento en la talla final a los 12 meses para niños y niñas a favor de quienes recibieron leche materna hasta los 12 meses de edad corregida (p = 0,044).Conclusiones: Hay una diferencia estadísticamente significativa para el aumento en la talla final a los 12 meses para niños y niñas. Esto nos permite apreciar que al recibir lactancia materna los indicadores de desnutrición al año de edad corregida son comparativamente menores.

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Dias Pereira, André, i Maria do Céu Patrão Neves. "A crise pandémica a vários ritmos". Cadernos Ibero-Americanos de Direito Sanitário 10, nr 3 (16.09.2021): 09–17. http://dx.doi.org/10.17566/ciads.v10i3.831.

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18 meses após o início da pandemia global, vislumbram-se centelhas de esperança graças à descoberta da vacina e o processo de vacinação, ambos realizados em tempo recorde, nos países mais desenvolvidos; simultaneamente, o horizonte encobre-se com as muitas sombras que constituem a iniquidade mundial no acesso à inoculação. E mesmo nos países mais desenvolvidos, sobretudo no plano individual, desenham-se sinais de preocupação como sejam as medidas eventualmente excessivas e desproporcionais no combate à pandemia, acompanhadas talvez por sentimentos de resignação em relação às várias proibições decretadas ou ingerências na vida privada e familiar o que, no seu conjunto, coloca à prova a tradição democrática e liberal ocidental. Importa levar a cabo uma reflexão bioética, que se caracterize pelo rigor da informação, por um reforçado respeito pela Declaração Universal dos Direitos Humanos e pelo cumprimento dos princípios e valores plasmados na Declaração Universal de Direitos Humanos e Bioética, da UNESCO, com vista a contribuir para os Objetivos de Desenvolvimento Sustentável das Nações Unidas.

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