Displasia glenoidea bilateral dolorosa asociada a inestabilidad

La hipoplasia glenoidea es una alteración relativamente infrecuente, de la que han sido descritos menos de 100 casos. Se comunica un caso de una enferma de 17 años de edad con clínica de dolor e inestabilidad en ambos hombros y hallazgo de displasia bilateral de cavidad glenoidea. Se realizó tratamiento conservador mediante pauta de refuerzo muscular con bandas elásticas de resistencia creciente con un resultado excelente calificado según puntuación de tabla de Rowe y cols. Desapareciendo la sensación de inestabilidad y habiendo cedido la clínica álgica.The glenoid hypoplasia is an uncommon condition. Less than 100 cases have been reported. We present the case of a 17 year old girl complaining of pain and instability in both shoulders and radiological findings of bilateral dysplasia of the glenoid. A non-operative treatment has been followed with an exercise program to strengthen the shoulder. This has been achieved with a progressive resistance rubber bands program. The final result has been excellent according to the appraisal table by Rowe et al., disappearing the instability sensation as well as the pain

Development of laser cladding MCrAlY coatings: high temperature friction and wear behaviour

Temperature can have a significant effect on the extent of wear damage of metallic components. Thermal barrier coatings with MCrAlY (where M=Ni, Co, Fe or combinations) alloys can improve the high temperature tribological and friction wear behaviour. In this work the dry friction and wear behaviour at room temperature and high temperature of new developed NiCoCrAlY and CoNiCrAlY laser cladding coatings were evaluated. Dense coatings, with good metallurgical bonding to the AISI 304 substrate was obtained by coaxial laser cladding tracks (40% overlapping), with previously optimized laser parameters. Tribological tests were performed by sliding wear at room temperature and 500 ºC, with an Al2O3 counterpart in ball on disk configuration tribometer. The wear scar surface was evaluated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) microanalysis. The 3D wear track topography was measured by inductive contact profilometer which enabled the wear rate calculation. The microstructure of the coatings consists of - Ni/-NiAl or -Co/-(Co,Ni)Al phases depending on the chemical composition of the alloy, as confirmed by X-ray diffraction (XRD) analysis. The wear test results show a reduction in wear rate at high temperature for all materials tested. For the NiCoCrAlY coating, the high temperature also reduces the friction coefficient, while it significantly increases the friction coefficient of CoNiCrAlY coating. The main damage mode is abrasion and adhesion, caused by oxides and partially-oxidized particles in the contact surface. The coatings and substrate results were compared, resulting in improved wear behaviour.The authors acknowledge the financial support of the Ministry of Science and Innovation of the Government of Spain through research project MAT2011-28492- C03 and the Generalitat Valenciana through ACOMP/2013/114 support. Professor Juan Carlos Pereira Falcón thanks the University of Carabobo for the financial support to pursue his doctoral studies at the UPV

High‐nuclearity mixed‐valence magnetic clusters : A general solution of the double exchange problem

We report here a general solution of the double‐exchange problem in the high‐nuclearity mixed valence systems containing arbitrary number P of the electrons delocalized over the network of N (P<N) localized spins. The developed approach is based on the successive (chainlike) spin‐coupling scheme and takes full advantage from the quantum angular momentum theory. In the framework of this approach the closed‐form analytical expressions are deduced for the matrix elements of the double exchange interaction, two‐electron transfer, and three‐center interaction that can be referred to as the potential exchange transfer. For the arbitrary nuclearity mixed‐valence systems the matrix elements of all named interactions are expressed in terms of all relevant spin quantum numbers and 6j symbols and do not contain higher order recoupling coefficients. We describe also the combined approach taking into account both angular momentum consideration and advantages of point symmetry adapted basis [email protected] , [email protected] ; [email protected] ; [email protected] ; [email protected]

Magnetic exchange interaction in a pair of orbitally degenerate ions: Magnetic anisotropy of [Ti2Cl9]−3

The theory of the kinetic exchange in a pair of orbitally degenerate ions developed by the authors [J. Phys. Chem. A 102, 200 (1998)] is applied to the case of face-shared bioctahedral dimer (overall D3h-symmetry). The effective kinetic exchange Hamiltonian is found for a 2T2–2T2 system taking into account all relevant transfer pathways and charge-transfer crystal field states. The influence of different transfer integrals involved in the kinetic exchange on the energy pattern and magnetic properties of the system is examined. The role of other related interactions (trigonal crystal field, spin–orbit coupling) is also discussed in detail. Using the pseudoangular momentum representation and the technique of the irreducible tensor operators of R3-group we give a general outlook on the nontrivial symmetry properties of the effective Hamiltonian for the D3h-pair, and on the magnetic anisotropy arising from the orbital interactions specific for the case of orbital degeneracy. The magnetic properties of the binuclear unit [Ti2Cl9]−3 in Cs3Ti2Cl9 are discussed with a special emphasis on the magnetic anisotropy experimentally observed in this system. The existing exchange models for [Ti2Cl9]−3 and the concept of the effective Hamiltonian are discussed in the context of the present [email protected] ; [email protected] ; [email protected] ; [email protected]

Trapping of three-dimensional electrons and transition to two-dimensional transport in the three-dimensional topological insulator Bi2Se3 under high pressure

[EN] This paper reports an experimental and theoretical investigation on the electronic structure of bismuth selenide (Bi2Se3) up to 9 GPa. The optical gap of Bi2Se3 increases from 0.17 eV at ambient pressure to 0.45 eV at 8 GPa. The quenching of the Burstein-Moss effect in degenerate samples and the shift of the free-carrier plasma frequency to lower energies reveal a quick decrease of the bulk three-dimensional (3D) electron concentration under pressure. On increasing pressure the behavior of Hall electron concentration and mobility depends on the sample thickness, consistently with a gradual transition from mainly 3D transport at ambient pressure to mainly two-dimensional (2D) transport at high pressure. Two-carrier transport equations confirm the trapping of high-mobility 3D electrons, an effect that can be related to a shallow-to-deep transformation of donor levels, associated with a change in the ordering of the conduction band minima. The high apparent areal density and low electron mobility of 2D electrons are not compatible with their expected properties in a Dirac cone. Measured transport parameters at high pressure are most probably affected by the presence of holes, either in an accumulation surface layer or as minority carriers in the bulk. ©2012 American Physical SocietyThis work has been done under financial support from Spanish MICINN under Grants No. MAT2008-06873-C02-02, No. MAT2007-66129, No. MAT2010-21270-C04-03/04, No. CSD2007-00045, and Prometeo No. GV2011/035. The supercomputer time has been provided by the Red Espanola de Supercomputacion (RES) and the MALTA cluster.Segura, A.; Panchal, V.; Sánchez-Royo, JF.; Marín-Borrás, V.; Muñoz-Sanjosé, V.; Rodríguez-Hernández, P.; Muñoz, A.... (2012). Trapping of three-dimensional electrons and transition to two-dimensional transport in the three-dimensional topological insulator Bi2Se3 under high pressure. Physical Review B. 85:195139-1-195139-9. https://doi.org/10.1103/PhysRevB.85.195139S195139-1195139-985Mishra, S. K., Satpathy, S., & Jepsen, O. (1997). Electronic structure and thermoelectric properties of bismuth telluride and bismuth selenide. Journal of Physics: Condensed Matter, 9(2), 461-470. doi:10.1088/0953-8984/9/2/014Hor, Y. S., Richardella, A., Roushan, P., Xia, Y., Checkelsky, J. G., Yazdani, A., … Cava, R. J. (2009). p-typeBi2Se3for topological insulator and low-temperature thermoelectric applications. Physical Review B, 79(19). doi:10.1103/physrevb.79.195208Zhang, H., Liu, C.-X., Qi, X.-L., Dai, X., Fang, Z., & Zhang, S.-C. (2009). Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface. Nature Physics, 5(6), 438-442. doi:10.1038/nphys1270Hasan, M. Z., & Kane, C. L. (2010). Colloquium: Topological insulators. Reviews of Modern Physics, 82(4), 3045-3067. doi:10.1103/revmodphys.82.3045Moore, J. E. (2010). 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STM Imaging of Electronic Waves on the Surface ofBi2Te3: Topologically Protected Surface States and Hexagonal Warping Effects. Physical Review Letters, 104(1). doi:10.1103/physrevlett.104.016401Roushan, P., Seo, J., Parker, C. V., Hor, Y. S., Hsieh, D., Qian, D., … Yazdani, A. (2009). Topological surface states protected from backscattering by chiral spin texture. Nature, 460(7259), 1106-1109. doi:10.1038/nature08308Butch, N. P., Kirshenbaum, K., Syers, P., Sushkov, A. B., Jenkins, G. S., Drew, H. D., & Paglione, J. (2010). Strong surface scattering in ultrahigh-mobilityBi2Se3topological insulator crystals. Physical Review B, 81(24). doi:10.1103/physrevb.81.241301Wang, Z., Lin, T., Wei, P., Liu, X., Dumas, R., Liu, K., & Shi, J. (2010). Tuning carrier type and density in Bi2Se3 by Ca-doping. Applied Physics Letters, 97(4), 042112. doi:10.1063/1.3473778Ren, Z., Taskin, A. A., Sasaki, S., Segawa, K., & Ando, Y. (2010). Large bulk resistivity and surface quantum oscillations in the topological insulatorBi2Te2Se. Physical Review B, 82(24). doi:10.1103/physrevb.82.241306Kulbachinskii, V. A., Miura, N., Nakagawa, H., Arimoto, H., Ikaida, T., Lostak, P., & Drasar, C. (1999). Conduction-band structure ofBi2−xSbxSe3mixed crystals by Shubnikov–de Haas and cyclotron resonance measurements in high magnetic fields. Physical Review B, 59(24), 15733-15739. doi:10.1103/physrevb.59.15733Analytis, J. G., McDonald, R. D., Riggs, S. C., Chu, J.-H., Boebinger, G. S., & Fisher, I. R. (2010). Two-dimensional surface state in the quantum limit of a topological insulator. Nature Physics, 6(12), 960-964. doi:10.1038/nphys1861Cho, S., Butch, N. P., Paglione, J., & Fuhrer, M. S. (2011). Insulating Behavior in Ultrathin Bismuth Selenide Field Effect Transistors. Nano Letters, 11(5), 1925-1927. doi:10.1021/nl200017fZhang, Y., He, K., Chang, C.-Z., Song, C.-L., Wang, L.-L., Chen, X., … Xue, Q.-K. (2010). Crossover of the three-dimensional topological insulator Bi2Se3 to the two-dimensional limit. Nature Physics, 6(8), 584-588. doi:10.1038/nphys1689Kong, D., Cha, J. J., Lai, K., Peng, H., Analytis, J. G., Meister, S., … Cui, Y. (2011). Rapid Surface Oxidation as a Source of Surface Degradation Factor for Bi2Se3. ACS Nano, 5(6), 4698-4703. doi:10.1021/nn200556hBenia, H. M., Lin, C., Kern, K., & Ast, C. R. (2011). Reactive Chemical Doping of theBi2Se3Topological Insulator. Physical Review Letters, 107(17). doi:10.1103/physrevlett.107.177602King, P. D. C., Hatch, R. C., Bianchi, M., Ovsyannikov, R., Lupulescu, C., Landolt, G., … Hofmann, P. (2011). Large Tunable Rashba Spin Splitting of a Two-Dimensional Electron Gas inBi2Se3. Physical Review Letters, 107(9). doi:10.1103/physrevlett.107.096802Hamlin, J. J., Jeffries, J. R., Butch, N. P., Syers, P., Zocco, D. A., Weir, S. T., … Maple, M. B. (2011). High pressure transport properties of the topological insulator Bi2Se3. Journal of Physics: Condensed Matter, 24(3), 035602. doi:10.1088/0953-8984/24/3/035602Köhler, H., & Hartmann, J. (1974). Burstein Shift of the Absorption Edge of nBi2Se3. physica status solidi (b), 63(1), 171-176. doi:10.1002/pssb.2220630116Panchal, V., Segura, A., & Pellicer-Porres, J. (2011). Low-cost set-up for Fourier-transform infrared spectroscopy in diamond anvil cell from 4000 to 400 cm−1. High Pressure Research, 31(3), 445-453. doi:10.1080/08957959.2011.594049Chervin, J. C., Canny, B., Besson, J. M., & Pruzan, P. (1995). A diamond anvil cell for IR microspectroscopy. Review of Scientific Instruments, 66(3), 2595-2598. doi:10.1063/1.1145594Piermarini, G. J., Block, S., Barnett, J. D., & Forman, R. A. (1975). Calibration of the pressure dependence of theR1ruby fluorescence line to 195 kbar. Journal of Applied Physics, 46(6), 2774-2780. doi:10.1063/1.321957Errandonea, D., Segura, A., Martínez-García, D., & Muñoz-San Jose, V. (2009). Hall-effect and resistivity measurements in CdTe and ZnTe at high pressure: Electronic structure of impurities in the zinc-blende phase and the semimetallic or metallic character of the high-pressure phases. Physical Review B, 79(12). doi:10.1103/physrevb.79.125203Errandonea, D., Martínez-García, D., Segura, A., Ruiz-Fuertes, J., Lacomba-Perales, R., Fages, V., … Mũnoz-San José, V. (2006). High-pressure electrical transport measurements on p-type GaSe and InSe. High Pressure Research, 26(4), 513-516. doi:10.1080/08957950601101787Hohenberg, P., & Kohn, W. (1964). Inhomogeneous Electron Gas. Physical Review, 136(3B), B864-B871. doi:10.1103/physrev.136.b864Kresse, G., & Hafner, J. (1993). Ab initiomolecular dynamics for liquid metals. Physical Review B, 47(1), 558-561. doi:10.1103/physrevb.47.558Kresse, G., & Hafner, J. (1994). Ab initiomolecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium. 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Physical Review Letters, 100(13). doi:10.1103/physrevlett.100.136406Mujica, A., Rubio, A., Muñoz, A., & Needs, R. J. (2003). High-pressure phases of group-IV, III–V, and II–VI compounds. Reviews of Modern Physics, 75(3), 863-912. doi:10.1103/revmodphys.75.863Köhler, H., & Becker, C. R. (1974). Optically Active Lattice Vibrations in Bi2Se3. physica status solidi (b), 61(2), 533-537. doi:10.1002/pssb.2220610218Vilaplana, R., Santamaría-Pérez, D., Gomis, O., Manjón, F. J., González, J., Segura, A., … Kucek, V. (2011). Structural and vibrational study of Bi2Se3under high pressure. Physical Review B, 84(18). doi:10.1103/physrevb.84.184110LaForge, A. D., Frenzel, A., Pursley, B. C., Lin, T., Liu, X., Shi, J., & Basov, D. N. (2010). Optical characterization ofBi2Se3in a magnetic field: Infrared evidence for magnetoelectric coupling in a topological insulator material. Physical Review B, 81(12). doi:10.1103/physrevb.81.125120Penn, D. R. (1962). 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Prevalencia en nuestro medio de las deformidades dinámicas posicionales del hallux como secuela de las fracturas de tercio medio y distal de tibia

Dynamic positional deformity of the hallux is a relatively new disease, precisely because of its innovative nature and dynamics may go unnoticed to clinicians. It is because of this, that the limited literature available stresses the importance of making an active search for this pathology in our daily practice. The purpose of this study is to estimate the prevalence of these deformities at the University Hospital Dr. Peset of Valencia as well as make an analysis of their management. An analytical, descriptive and retrospective study was designed in which patients admitted in our center during 2014 and 2015 with medium and distal third tibia fracture were analyzed searching for dynamics positional deformities of the hallux. We found a total of 5 compatible cases from 42 analyzed tibia fractures. This may indicate that as expected dynamic positional deformity of the hallux could be an underrated disease in our medium

Development of Ti–In alloys by powder metallurgy for application as dental biomaterial

Substantial progress has been made in Ti alloys’ properties and chemical composition. However, the effect of porosity and indium content on biocompatibility and corrosion behavior has not been sufficiently studied. Indium (In) is a promising nontoxic element that can replace other toxic elements, while porosity is associated with a good biological response. The purpose of this paper is to evaluate the achievability of three Ti–In alloys with 2.5, 5, and 10 wt.% Indium by powder metallurgy methods as dental prostheses. The findings of the present work showed that In acted as a grain refiner, and allowed us to obtain an 11.2-fold reduction for the Ti–10In sample than for the Ti–2.5In alloy. The total porosity of the Ti–In alloys decreased according to In content, however, grain size and In content showed a greater effect on the mechanical behavior in comparison with the effect of porosity, probably because of the low porosity percentage. All the mechanical values fell within the ranges accepted in the literature for dental implant applications. The Ti3+ and In3+ ion releases were below the toxic concentrations for the human body, with a maximum of 0.43 and 0.016 μg cm−2 h−1, respectively. Corrosion sensitivity decreased with In addition due to its surface protective effect on the Ti-matrix. These results proved that utilizing powder metallurgy methods, Ti–In alloys are feasible candidates for dental prosthesis. Of the three prepared Ti–In alloys, the Ti–10In alloy properties made it the most appropriate Ti–In alloy to be used as a dental implant

Development and characterization of a new predominantly β Ti–15Mo–5In alloy for biomedical applications

A new Ti–Mo–In alloy was designed for biomedical implant applications and produced by powder metallurgy. Mechanical properties, ion release, and electrochemical assessments were conducted to uncover its biomaterial feasibility. The Ti–15Mo–5In alloy consisted of a nearly equiaxed and micrometric β matrix with acicular α and fine dispersed α′′ phases. Mo and In chosen contents encouraged flexural strength (0.59 GPa) and hardness (3.9 GPa) beyond the values for human bone in the literature. As expected from the predominantly β microstructure, a medium value of elastic modulus (80 GPa) was obtained. The ion Ti (0.019 μgL−1 cm−2 h−1), Mo (0.622 μgL−1 cm−2 h−1), and In (0.001 μgL−1 cm−2 h−1) released concentrations were below harmful concentrations to human health. Corrosion rates during immersion and electrochemical tests (0.524 and 0.1 μm year−1, respectively) were lower than those reported for various implant materials. The Ti–15Mo–5In alloy is a feasible option for orthopedic and dental implants. Graphical Abstract: [Figure not available: see fulltext.]

High-pressure vibrational and optical study of Bi2Te3

We report an experimental and theoretical lattice dynamics study of bismuth telluride (Bi2Te3) up to 23 GPa together with an experimental and theoretical study of the optical absorption and reflection up to 10 GPa. The indirect bandgap of the low-pressure rhombohedral (R-3m) phase (α-Bi2Te3) was observed to decrease with pressure at a rate of −6 meV/GPa. In regard to lattice dynamics, Raman-active modes of α-Bi2Te3 were observed up to 7.4 GPa. The pressure dependence of their frequency and width provides evidence of the presence of an electronic-topological transition around 4.0 GPa. Above 7.4 GPa a phase transition is detected to the C2/m structure. On further increasing pressure two additional phase transitions, attributed to the C2/c and disordered bcc (Im-3m) phases, have been observed near 15.5 and 21.6 GPa in good agreement with the structures recently observed by means of x-ray diffraction at high pressures in Bi2Te3. After release of pressure the sample reverts back to the original rhombohedral phase after considerable hysteresis. Raman- and IR-mode symmetries, frequencies, and pressure coefficients in the different phases are reported and discussed.This work has been done under financial support from Spanish MICINN under projects MAT2008-06873-C02- 02, MAT2007-66129, Prometeo/2011-035, MAT2010-21270-C04-03/04, and CSD2007-00045 and supported by the Ministry of Education, Youth and Sports of the Czech Republic (MSM 0021627501)