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Title:

Free temporal fascia flap to cover soft tissue defects of the foot: a case report ; Der freie Temporalisfaszienlappen zur Defektdeckung am Fußrücken

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Severe soft tissue defects as a result of lye contamination remain a huge challenge in the interdisciplinary approach of trauma surgeons and plastic surgeons. Free tissue transfer is a suitable surgical option for successful reconstruction of form and function of defects in the distal parts of the lower extremities. We report the successful two-...

Severe soft tissue defects as a result of lye contamination remain a huge challenge in the interdisciplinary approach of trauma surgeons and plastic surgeons. Free tissue transfer is a suitable surgical option for successful reconstruction of form and function of defects in the distal parts of the lower extremities. We report the successful two-stage reconstruction of a full thickness lye contamination at the dorsum of the foot with a free temporoparietal fascia flap covered with a split-thickness skin graft from the thigh. The described method is a suitable operative alternative to anterolateral thigh flaps or other thin fascia flaps regarding flap harvest and donor site morbidity and should be considered in the portfolio of the plastic surgeon. ; Laugenverätzungen am Vorfuß sind eine häufige Ursache für schwere Schädigungen der Weichteile an einer sensiblen Lokalisation dar. Aufgrund der tiefgehenden Kolliquationsnekrose erfordern diese Verletzungen oft den freien mikrochirurgischen Gewebetransfer. Im Falle einer drittgradigen Laugenverätzung des Vorfußes mit freiliegendem Sehnengewebe ist die zweizeitige Rekonstruktion durch adäquates Debridement und definitive Defektdeckung durch die freie mikrovaskulär anastomosierte Temporalisfaszienlappenplastik mit gleichzeitiger Spalthauttransplantation eine gute Alternative zur ALT-Lappenplastik oder anderen dünnen Faszienlappen. Aufgrund der sicheren Präparation sowie der geringen Hebemorbidität eignet sich die hier vorgestellte Methode sehr gut zur Defektdeckung am Fußrücken. Minimize

Publisher:

German Medical Science GMS Publishing House; Düsseldorf

Year of Publication:

2015-01-13

Source:

GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW

GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW Minimize

Document Type:

article

Language:

eng

Subjects:

temporoparietal fascia flap ; flap reconstruction and foot ; reconstruction foot ; lye acid surgery ; flap reconstruction ; defect lower extremities ; trauma foot ; Temporalisfaszienlappen ; Rekonstruktion Defektwunden Fuß ; Lappenplastik Fuß ; Laugenverätzung ; Lappenplastik ; Defektwunden untere Extremität ; Trauma Fuß ; ddc:610

temporoparietal fascia flap ; flap reconstruction and foot ; reconstruction foot ; lye acid surgery ; flap reconstruction ; defect lower extremities ; trauma foot ; Temporalisfaszienlappen ; Rekonstruktion Defektwunden Fuß ; Lappenplastik Fuß ; Laugenverätzung ; Lappenplastik ; Defektwunden untere Extremität ; Trauma Fuß ; ddc:610 Minimize

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http://www.egms.de/en/terms.htm

http://www.egms.de/en/terms.htm Minimize

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Dhamangaonkar AC, Patankar HS. Reverse sural fasciocutaneous flap with a cutaneous pedicle to cover distal lower limb soft tissue defects: experience of 109 clinical cases. J Orthop Traumatol. 2014 Sep;15(3):225-9. DOI: 10.1007/s10195-014-0304-0 ; Duteille F, Sartre JY, Perrot P, Gouin F, Pannier M. Particularités de la couverture des pertes de...

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Title:

Low-frequency incommensurate magnetic response in strongly correlated systems

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It is shown that in the t-J model of Cu-O planes at low frequencies the dynamic spin structure factor is peaked at incommensurate wave vectors (1/2+-delta,1/2)$, (1/2,1/2+-delta). The incommensurability is connected with the momentum dependencies of the magnon frequency and damping near the antiferromagnetic wave vector. The behavior of the inco...

It is shown that in the t-J model of Cu-O planes at low frequencies the dynamic spin structure factor is peaked at incommensurate wave vectors (1/2+-delta,1/2)$, (1/2,1/2+-delta). The incommensurability is connected with the momentum dependencies of the magnon frequency and damping near the antiferromagnetic wave vector. The behavior of the incommensurate peaks is similar to that observed in La_{2-x}(Ba,Sr)_xCuO_{4+y} and YBa_2Cu_3O_{7-y}: for hole concentrations 0.02<x<=0.12 we find that delta is nearly proportional to x, while for x>0.12 it tends to saturation. The incommensurability disappears with increasing temperature. Generally the incommensurate magnetic response is not accompanied by an inhomogeneity of the carrier density. ; Comment: 4 pages, 4 figures Minimize

Year of Publication:

2004-02-20

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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Title:

Temperature behavior of the magnon modes of the square lattice antiferromagnet

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A spin-wave theory of short-range order in the square lattice Heisenberg antiferromagnet is formulated. With growing temperature from T=0 a gapless mode is shown to arise simultaneously with opening a gap in the conventional spin-wave mode. The spectral intensity is redistributed from the latter mode to the former. For low temperatures the theor...

A spin-wave theory of short-range order in the square lattice Heisenberg antiferromagnet is formulated. With growing temperature from T=0 a gapless mode is shown to arise simultaneously with opening a gap in the conventional spin-wave mode. The spectral intensity is redistributed from the latter mode to the former. For low temperatures the theory reproduces results of the modified spin-wave theory by M.Takahashi, J.E.Hirsch et al. and without fitting parameters gives values of observables in good agreement with Monte Carlo results in the temperature range 0 <= T < 0.8J where J is the exchange constant. ; Comment: 12 pages, 2 figures Minimize

Year of Publication:

1999-05-24

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Statistical Mechanics

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Statistical Mechanics Minimize

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Title:

Pseudogaps and magnetic properties of the two-dimensional t-J model

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We apply the modified spin-wave theory with the constraint of zero staggered magnetization to investigate normal-state spectral and magnetic properties of the 2D t-J model in the paramagnetic state. A set of self-energy equations for hole and magnon Green's functions is solved numerically in the self-consistent Born approximation. The constraint...

We apply the modified spin-wave theory with the constraint of zero staggered magnetization to investigate normal-state spectral and magnetic properties of the 2D t-J model in the paramagnetic state. A set of self-energy equations for hole and magnon Green's functions is solved numerically in the self-consistent Born approximation. The constraint can be fulfilled in the ranges of hole concentrations 0.02 < x < 0.17 and temperatures T < 150 K. In this region the hole spectrum differs from a conventional metallic spectrum which is manifested in the variation with x of the quasiparticle weights of states and in the violation of Luttinger's theorem. With decreasing x from x = 0.17 hidden parts appear in the hole Fermi surface which can be interpreted as the opening of a pseudogap near (pi,0). Obtained size, symmetry and concentration dependence of the pseudogap are in agreement with photoemission data in Bi2212. Calculated temperature dependencies of the spin correlation length, spin-lattice relaxation times at the Cu and O sites, and static susceptibility are typical for the quantum disordered regime with a pseudogap in the spectrum of magnetic excitations. These quantities are in qualitative and in some cases in quantitative agreement with experiment in underdoped YBa2Cu3O(6+y). At x > 0.12 the considered phase borders the phase of conventional metal. ; Comment: 25 pages, 12 Postscript figures, uses psfig.sty Minimize

Year of Publication:

1998-08-08

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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530 Physics *(computed)*

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Title:

Magnetic susceptibility in the pseudogap phase of cuprate perovskites

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We calculate the magnetic susceptibility in the pseudogap phase of cuprates using the two-dimensional $t-J$ model and the Mori projection operator technique. In this phase, the Fermi arcs lead to a quasi-elastic incommensurate magnetic response for low temperatures. The theory accounts for the reorientation of the susceptibility maxima from the ...

We calculate the magnetic susceptibility in the pseudogap phase of cuprates using the two-dimensional $t-J$ model and the Mori projection operator technique. In this phase, the Fermi arcs lead to a quasi-elastic incommensurate magnetic response for low temperatures. The theory accounts for the reorientation of the susceptibility maxima from the axial to the diagonal direction occurring at small hole concentrations in La$_{2-x}$Sr$_x$CuO$_4$. A small cusp of the hole dispersion near the Fermi level, which is connected with the spin-polaron band, affords the growth of the maxima with decreasing frequency. As in the superconducting phase, the susceptibility maxima have an hourglass dispersion. The assumption of the phase separation into regions of superconducting and pseudogap phases in underdoped cuprates explains the lack of the superconducting gap in their susceptibility. The observed rapid change of widths of the susceptibility maxima with frequency is related to the contribution of the pseudogap phase. This contribution may also explain the strengthening of the quasi-elastic response by modest magnetic fields and by small impurity concentrations. ; Comment: 11 pages, 7 figures Minimize

Year of Publication:

2011-12-06

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

530 Physics *(computed)*

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Title:

Strongly correlated electron system in the magnetic field

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The energy spectrum of the two-dimensional t-J model in a perpendicular magnetic field is investigated. The density of states at the Fermi level as a function of the inverse magnetic field $\frac{1}{B}$ reveals oscillations in the range of hole concentrations $0.08<x<0.18$. In the used approximation zero-field Fermi surfaces are large for these ...

The energy spectrum of the two-dimensional t-J model in a perpendicular magnetic field is investigated. The density of states at the Fermi level as a function of the inverse magnetic field $\frac{1}{B}$ reveals oscillations in the range of hole concentrations $0.08<x<0.18$. In the used approximation zero-field Fermi surfaces are large for these $x$, and oscillation frequencies conform with such Fermi surfaces. However, the amplitude of these oscillations is modulated with a frequency which is smaller by an order of magnitude. The appearance of this modulation is related to van Hove singularities in the Landau subbands, which traverse the Fermi level with changing $B$. The singularities are connected with bending the Landau subbands due to strong electron correlations. The frequency of the modulation is of the same order of magnitude as the quantum oscillation frequency observed in underdoped cuprates. ; Comment: 14 pages, 4 figures Minimize

Year of Publication:

2013-08-01

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons

Condensed Matter - Strongly Correlated Electrons Minimize

DDC:

530 Physics *(computed)*

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Title:

Resonance peak in underdoped cuprates

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The magnetic susceptibility measured in neutron scattering experiments in underdoped YBa$_2$Cu$_3$O$_{7-y}$ is interpreted based on the self-consistent solution of the t-J model of a Cu-O plane. The calculations reproduce correctly the frequency and momentum dependencies of the susceptibility and its variation with doping and temperature in the ...

The magnetic susceptibility measured in neutron scattering experiments in underdoped YBa$_2$Cu$_3$O$_{7-y}$ is interpreted based on the self-consistent solution of the t-J model of a Cu-O plane. The calculations reproduce correctly the frequency and momentum dependencies of the susceptibility and its variation with doping and temperature in the normal and superconducting states. This allows us to interpret the maximum in the frequency dependence -- the resonance peak -- as a manifestation of the excitation branch of localized Cu spins and to relate the frequency of the maximum to the size of the spin gap. The low-frequency shoulder well resolved in the susceptibility of superconducting crystals is connected with a pronounced maximum in the damping of the spin excitations. This maximum is caused by intense quasiparticle peaks in the hole spectral function for momenta near the Fermi surface and by the nesting. ; Comment: 9 pages, 6 figures Minimize

Year of Publication:

2003-07-09

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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530 Physics *(computed)*

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Title:

Two-dimensional t-J model at moderate doping

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Using the method which retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering, spectral and magnetic properties of the two-dimensional t-J model in the normal state are investigated for the ranges of hole concentrations 0 <= x <= 0.16 and temperatures 0.01t <= T <= 0.2t. The used hopping t ...

Using the method which retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering, spectral and magnetic properties of the two-dimensional t-J model in the normal state are investigated for the ranges of hole concentrations 0 <= x <= 0.16 and temperatures 0.01t <= T <= 0.2t. The used hopping t and exchange J parameters of the model correspond to hole-doped cuprates. The obtained solutions are homogeneous which indicates that stripes and other types of phase separation are not connected with the strong electron correlations described by the model. A series of nearly equidistant maxima in the hole spectral function calculated for low T and x is connected with hole vibrations in the region of the perturbed short-range antiferromagnetic order. The hole spectrum has a pseudogap in the vicinity of (0,\pi) and (\pi,0). For x \approx 0.05 the shape of the hole Fermi surface is transformed from four small ellipses around (\pm\pi/2,\pm\pi/2) to two large rhombuses centered at (0,0) and (\pi,\pi). The calculated temperature and concentration dependencies of the spin correlation length and the magnetic susceptibility are close to those observed in cuprate perovskites. These results offer explanations for the observed scaling of the static uniform susceptibility and for the changes in the spin-lattice relaxation and spin-echo decay rates in terms of the temperature and doping variations in the spin excitation spectrum of the model. ; Comment: 12 pages, 14 figures Minimize

Year of Publication:

2003-02-18

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

DDC:

530 Physics *(computed)*

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Title:

Incommensurate spin dynamics in underdoped cuprate perovskites

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The incommensurate magnetic response observed in normal-state cuprate perovskites is interpreted based on the projection operator formalism and the t-J model of Cu-O planes. In agreement with experiment the calculated dispersion of maxima in the susceptibility has the shape of two parabolas with upward and downward branches which converge at the...

The incommensurate magnetic response observed in normal-state cuprate perovskites is interpreted based on the projection operator formalism and the t-J model of Cu-O planes. In agreement with experiment the calculated dispersion of maxima in the susceptibility has the shape of two parabolas with upward and downward branches which converge at the antiferromagnetic wave vector. The maxima are located at the momenta $({1/2},{1/2}\pm\delta)$, $({1/2}\pm\delta,{1/2})$ and at $({1/2}\pm\delta,{1/2}\pm\delta)$, $({1/2}\pm\delta,{1/2}\mp\delta)$ in the lower and upper parabolas, respectively. The upper parabola reflects the dispersion of magnetic excitations of the localized Cu spins, while the lower parabola arises due to a dip in the spin-excitation damping at the antiferromagnetic wave vector. For moderate doping this dip stems from the weakness of the interaction between the spin excitations and holes near the hot spots. The frequency dependence of the susceptibility is shown to depend strongly on the hole bandwidth and damping and varies from the shape observed in YBa$_2$Cu$_3$O$_{7-y}$ to that inherent in La$_{2-x}$Sr$_x$CuO$_4$. ; Comment: 15 pages, 7 figures Minimize

Year of Publication:

2005-01-18

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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530 Physics *(computed)*

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Title:

Peculiarities of the spectrum of strongly correlated electrons

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Hole and spin Green's functions of the two-dimensional t-J model of the Cu-O planes are calculated in an approximation which retains the rotation symmetry in the paramagnetic state and has no presumed magnetic ordering. In this approximation Green's functions are represented by continued fractions which are interrupted by decouplings with a vert...

Hole and spin Green's functions of the two-dimensional t-J model of the Cu-O planes are calculated in an approximation which retains the rotation symmetry in the paramagnetic state and has no presumed magnetic ordering. In this approximation Green's functions are represented by continued fractions which are interrupted by decouplings with a vertex correction determined from the constraint of zero site magnetization in the paramagnetic state. Obtained results are shown to be in good agreement with Monte Carlo and exact diagonalization data. The calculated spectra demonstrate a pseudogap and a band splitting which are similar to those observed in Bi-based cuprate perovskites. ; Comment: 10 pages, 5 figures, Proceedings of the NATO ARW "New Trends in Superconductivity", Yalta, Ukraine, 16-20 Sept. 2001 Minimize

Year of Publication:

2001-08-29

Document Type:

text

Subjects:

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity

Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Superconductivity Minimize

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