bluuebunny/crossref_metadata_2025_split huggingface dataset:
Responsiveness and ceiling effects of the Forgotten Joint Score-12 following total hip arthroplasty
Authors: Hamilton D. F. , Giesinger J. M. , MacDonald D. J. , Simpson A. H. R. W. , Howie C. R. , Giesinger K. 
Published: March 2016

Objectives To assess the responsiveness and ceiling/floor effects of the Forgotten Joint Score -12 and to compare these with that of the more widely used Oxford Hip Score (OHS) in patients six and 12 months after primary total hip arthroplasty. Methods We prospectively collected data at six and 12 months following total hip arthroplasty from 193 patients undergoing surgery at a single centre. Ceiling effects are outlined with frequencies for patients obtaining the lowest or highest possible score. Change over time from six months to 12 months post-surgery is reported as effect size (Cohen’s d). Results The mean OHS improved from 40.3 (sd 7.9) at six months to 41.9 (sd 7.2) at 12 months. The mean FJS-12 improved from 56.8 (sd 30.1) at six months to 62.1 (sd 29.0) at 12 months. At six months, 15.5% of patients reached the best possible score (48 points) on the OHS and 8.3% obtained the best score (100 points) on the FJS-12. At 12 months, this percentage increased to 20.8% for the OHS and to 10.4% for the FJS-12. In terms of the effect size (Cohen’s d), the change was d = 0.10 for the OHS and d = 0.17 for the FJS-12. Conclusions The FJS-12 is more responsive to change between six and 12 months following total hip arthroplasty than is the OHS, with the measured ceiling effect for the OHS twice that of the FJS-12. The difference in effect size of change results in substantial differences in required sample size if aiming to detect change between these two time points. This has important implications for powering clinical trials with patient-reported measures as the primary outcome. Cite this article: Dr D. F. Hamilton. Responsiveness and ceiling effects of the Forgotten Joint Score-12 following total hip arthroplasty. Bone Joint Res 2016;5:87–91. DOI: 10.1302/2046-3758.53.2000480.
Can a total knee arthroplasty be both rotationally unconstrained and anteroposteriorly stabilised?
Authors: Scott G. , Imam M. A. , Eifert A. , Freeman M. A. R. , Pinskerova V. , Field R. E. , Skinner J. , Banks S. A. 
Published: March 2016

ObjectivesThroughout the 20th Century, it has been postulated that the knee moves on the basis of a four-bar link mechanism composed of the cruciate ligaments, the femur and the tibia. As a consequence, the femur has been thought to roll back with flexion, and total knee arthroplasty (TKA) prostheses have been designed on this basis. Recent work, however, has proposed that at a position of between 0° and 120° the medial femoral condyle does not move anteroposteriorly whereas the lateral femoral condyle tends, but is not obliged, to roll back – a combination of movements which equates to tibial internal/ femoral external rotation with flexion. The aim of this paper was to assess if the articular geometry of the GMK Sphere TKA could recreate the natural knee movements in situ/in vivo.MethodsThe pattern of knee movement was studied in 15 patients (six male: nine female; one male with bilateral TKAs) with 16 GMK Sphere implants, at a mean age of 66 years (53 to 76) with a mean BMI of 30 kg/m2(20 to 35). The motions of all 16 knees were observed using pulsed fluoroscopy during a number of weight-bearing and non-weight-bearing static and dynamic activities.ResultsDuring maximally flexed kneeling and lunging activities, the mean tibial internal rotation was 8° (standard deviation (sd) 6). At a mean 112° flexion (sd 16) during lunging, the medial and lateral condyles were a mean of 2 mm (sd 3) and 8 mm (sd 4) posterior to a transverse line passing through the centre of the medial tibial concavity. With a mean flexion of 117° (sd 14) during kneeling, the medial and lateral condyles were a mean of 1 mm (sd 4) anterior and 6 mm (sd 4) posterior to the same line. During dynamic stair and pivoting activities, there was a mean anteroposterior translation of 0 mm to 2 mm of the medial femoral condyle. Backward lateral condylar translation occurred and was linearly related to tibial rotation.ConclusionThe GMK Sphere TKA in our study group shows movements similar in pattern, although reduced in magnitude, to those in recent reports relating to normal knees during several activities. Specifically, little or no translation of the medial femoral condyle was observed during flexion, but there was posterior roll-back of the lateral femoral condyle, equating to tibiofemoral rotation. We conclude that the GMK Sphere is anteroposteriorly stable medially and permits rotation about the medial compartment. Cite this article: Professor G. Scott. Can a total knee arthroplasty be both rotationally unconstrained and anteroposteriorly stabilised?: A pulsed fluoroscopic investigation. Bone Joint Res 2016;5:80–86. DOI: 10.1302/2046-3758.53.2000621.
From lonesome cowboys to geek masculinities: A study of documentary films on the financial crisis
Authors: Raesch Monika , Lee Micky , Cooper Frank Rudy 
Published: March 2016

Abstract
Space is a vantage point from which masculinity can be critiqued and understood. Documentary film-makers employ specific mode(s) to relate space to masculinity by positioning themselves vis-à-vis the interviewees, and the interviewees vis-à-vis the viewers. A financial crisis may threaten the hegemonic masculinity embodied by Wall Street’s lonesome cowboys and provide a chance for film-makers to critique this type of masculinity. This article analyses three documentary films, I.O.U.S.A., Capitalism: A Love Story and Floored, which were released after the 2008 economic crisis in the United States. The films contain three prototypes: the lonesome cowboy; white, working-class masculinity; and hypermasculinity. These films may portend a new masculinity that prioritizes intellectual bravado, geek masculinity.
‘Will I do myself proud or only what’s allowed?’ Performing masculinities and Generation X men in contemporary Hollywood comedies
Authors: Pace Tom 
Published: March 2016

Abstract
This article explores how Generation X men are portrayed in romantic comedies featuring friendships between men, or bromances, including films such as The 40-Year-Old Virgin, Knocked Up and This is 40, directed by Judd Apatow and Juno, directed by Jason Reitman. Using Judith Butler’s theories of gender performativity, this article explores how these films perform competing masculinities and how they at times signify these masculinities by focusing on the body. As such, these films portray Generation X men variously as contradictory, as adaptable (or not) to changing circumstances, as unsure in their relationship with women in a post-feminist world, and at odds with their Baby Boomer predecessors and Millennial successors.
Distributional Chaos of Cournot maps
Authors: Peña José Salvador Cáovas , López Gabriel Soler , Marín Manuel Ruiz 
Published: March 2016

Abstract
We study the notion of distributional chaos for a class of two-dimensional maps called Cournot maps, which models a competitive economic process (Cournot duopoly). Among other results, we prove that a Cournot map has positive topological entropy if and only if it is distributionally chaotic.
Time-vanishing properties of solutions of some degenerate parabolic equations with strong absorption
Authors: Belaud Y. 
Published: March 2016

Abstract
Let Ω be an open bounded subset of ℝN and b a measurable nonnegative function in ℝ. We study the time compact support property for ∂tu - Δpu + b(x)uq = 0 with p > 2 and for ∂tu - Δ(um) + b(x)uq = 0 with m > 1 where 0 ≤ q < 1. Some criteria involving the asymptotics as h → 0 of the first eigenvalue of

are given which imply such a phenomenon. Applying these criteria we deduce that the time vanishing property occurs when 1/b belongs to Ls(Ω) for some s depending on q, and p or m.
Uniqueness and Generic Non-degeneracy on Strips
Authors: Dances E.N. 
Published: March 2016

Abstract
In this paper, we prove the uniqueness of the positive decaying solution of -Δu = up - λu on S,u = 0 on ∂S where S is an infinite strip in Rn and p > 1 but close to 1. We can use this and real analyticity to prove that for “most” p in (1, (n + 2)/(n - 2)) our problem has a nondegenerate positive decaying solution.
Twist Solutions of a Hill's Equation with Singular Term
Authors: Torres Pedro J. 
Published: March 2016

Abstract
The paper deals with the existence of twist solutions of a Hill's equation with singular term (often called Brillouin equation in the related literature) for a given region of parameters involved on the equation. Solutions of twist type are in particular Lyapunov stable and present interesting dynamical features around them. The techniques of proof include upper and lower solutions, topological degree and classical tools on normal forms of area preserving maps.
Periodic Solutions of Singular Nonlinear Perturbations of the Ordinary p-Laplacian
Authors: Jebelean P. , Mawhin J. 
Published: March 2016

Abstract
Using some recent extensions of upper and lower solutions techniques and continuation theorems to the periodic solutions of quasilinear equations of p-Laplacian type, we prove the existence of positive periodic solutions of equations of the form
(|xʹ|p-2xʹ)ʹ + f(x)xʹ + g(x) = h(t)
with p > 1, f arbitrary and g singular at 0. This extends results of Lazer and Solimini for the undamped ordinary differential case.
Uniform Bounds for the Best Sobolev Trace Constant
Authors: Bonder Julián Fernández , Rossi Julio D. , Ferreira Raúl 
Published: March 2016

Abstract
We study the Sobolev trace embedding W1,p(Ω) ↪ Lq(∂Ω), looking at the dependence of the best constant and the extremals on p and q. We prove that there exists a uniform bound (independent of (p, q)) for the best constant if and only if (p, q) lies far from (N, ∞). Also we study some limit cases, q = ∞ with p > N or p = ∞ with 1 ≤ q ≤ ∞.
Existence and Uniqueness of Positive Large Solutions to Some Cooperative Elliptic Systems
Authors: García-Melián Jorge , Suárez Antonio 
Published: March 2016

Abstract
In this work we consider positive solutions to cooperative elliptic systems of the form -Δu = λu - u2 + buυ, -Δυ = μυ - υ2 + cuυ a bounded smooth domain Ω ⊂ ℝN (λ, μ ∈ ℝ, b, c > 0) which blow up on the boundary ∂Ω, that is u(x), v(x) → ∞ as dist(x, ∂Ω) → 0. We show existence and nonexistence of solutions, and give sufficient conditions for uniqueness. We also provide an exact estimate of the behaviour of the solutions near the boundary in terms of dist(x, ∂Ω).
Prescribing the Scalar Curvature Problem on Three and Four Manifolds
Authors: Chtioui Hichem 
Published: March 2016

Abstract
This paper is devoted to the prescribed scalar curvature problem on 3 and 4- dimensional Riemannian manifolds. We give a new class of functionals which can be realized as scalar curvature. Our proof uses topological arguments and the tools of the theory of the critical points at infinity.
Existence of Radial Solutions for Quasilinear Elliptic Equations with Singular Nonlinearities
Authors: Acciaio Beatrice , Pucci Patrizia 
Published: March 2016

Abstract
We prove the existence of radial solutions of the quasilinear elliptic equation div(A(|Du|)Du) + f(u) = 0 in ℝn, n > 1, where f is either negative or positive for small u > 0, possibly singular at u = 0, and grows subcritically for large u. Our proofs use only elementary arguments based on a variational identity. No differentiability assumptions are made on f.
Homoclinic Solutions for a Class of Hamiltonian Systems
Authors: Boughariou Morched 
Published: March 2016

Abstract
We consider the first order Hamiltonian system
q̇ = Hp(p, q),
ṗ = −Hq(p, q), (HS)
where p, q : ℝ → ℝN (N ≥ 3), H ∈ C1 (ℝN × ℝN \ {e}, ℝ ) and behaves roughly like

Under the condition that V has a unique absolute maximum at 0 and some technical assumptions on H, we prove that (HS) has a non-trivial homoclinic solution.
On the Periodic Boundary Value Problem and Chaotic-like Dynamics for Nonlinear Hill’s Equations
Authors: Papini Duccio , Zanolin Fabio 
Published: March 2016

Abstract
We present some results which show the rich and complicated structure of the solutions of the second order differential equation ẍ + w(t)g(x) = 0 when the weight w(t) changes sign and g is sufficiently far from the linear case. New applications, motivated by recent studies on the superlinear Hill’s equation in [57, 58, 59], are then proposed for some asymptotically linear equations and for some sublinear equations with a sign-indefinite weight. Our results are based on a fixed point theorem for maps which satisfy a stretching condition along the paths on two-dimensional cells.
Ground States and Singular Ground States for Quasilinear Partial Differential Equations with Critical Exponent in the Perturbative Case
Authors: Franca Matteo , Johnson Russell 
Published: March 2016

Abstract
We study the structure of the family of radially symmetric ground states and singular ground states for certain elliptic partial differential equations with p- Laplacian. We use methods of Dynamical systems such as Melnikov functions, invariant manifolds, and exponential dichotomy.
A Multiplicity Result for Singularly Perturbed Problems in Topologically Nontrivial Domains
Authors: Cerami Giovanna , Molle Riccardo 
Published: March 2016

Abstract
The problem − ε2Δu + aε(x)u = up−1 with zero Dirichlet boundary condition is considered in a nontrivial bounded domain Ω ⊂ ℝN. Under the assumption that aε(x) ≥ a0 > 0 concentrates at a point of Ω as ε → 0 and has a suitable behaviour at infinity and, moreover, that p > 2 and

if N ≥ 3, the existence of at least (cat Ω̅) + 2 distinct positive solutions is proved.
Multiplicity Results for the Supercritical Hénon Equation
Authors: Badiale Marino , Serra Enrico 
Published: March 2016

Abstract
We study the Dirichlet problem for the Hénon equation ¡Δu = |x|αup-1 in the unit ball B ⊂ RN. For N ≥ 4 and α large we prove the existence of positive nonradial solutions for a range of p's including supercritical values.
On the Variational Approach to the Stability of Standing Waves for the Nonlinear Schrödinger Equation
Authors: Hajaiej H. , Stuart C.A. 
Published: March 2016

Abstract
We consider the orbital stability of standing waves of the nonlinear Schrdinger equation

by the approach that was laid down by Cazenave and Lions in 1992. Our work covers several situations that do not seem to be included in previous treatments, namely,
(i) g(x, s) − g(x, 0) → 0 as |x| → ∞ for all s ≥ 0. This includes linear problems.
(ii) g(x, s) is a periodic function of x ∈ ℝN for all s ≥ 0.
(iii) g(x, s) is asymptotically periodic in the sense that g(x, s) − g∞(x, s) → 0 as |x| → ∞ for some function g∞ that is periodic with respect to x ∈ ℝN for all s ≥ 0.
Furthermore, we focus attention on the form of the set that is shown to be stable and may be bigger than what is usually known as the orbit of the standing wave.
Some Remarks on Elliptic Equations with Singular Potentials and Mixed Boundary Conditions
Authors: Abdellaoui Boumediene , Colorado Eduardo , Peral Ireneo 
Published: March 2016

Abstract
We study the problems

where

is a smooth bounded domain with 0 ∈ Ω, and

, mixed boundary condition. Mainly we will be interested in the behavior of the solutions to (0.1) close to the critical constant in the Hardy-Sobolev inequality, ΛN,γ(Ω,Σ1).
Precise Asymptotic Properties of Solutions to Two-Parameter Elliptic Eigenvalue Problems in a Ball
Authors: Shibata Tetsutaro 
Published: March 2016

Abstract
We consider the simple pendulum type equation with two-parameters μ, λ > 0 in a ball BR. For a given μ > 0, a solution triple (μ, λ(μ), uμ) ∈ R+
2 × C2(B̅R) is obtained by a variational method, and uμ develops a boundary layer as μ → ∞. We establish the two-term asymptotic formulas for ∥uμ∥∞, u′μ(R)2 and the variational eigencurve λ(μ) as μ → ∞. It is shown that the coefficients of the second terms of ∥uμ∥∞, u′μ(R)2 and λ(μ) depend on 1/R, the mean curvature of ∂BR. Since the second term of the maximum norm of the solution for the corresponding one parameter problems does not depend on the mean curvature of ∂BR, the results obtained here seem to be new.
Existence and Multiplicity of Solution for a Class of Quasilinear Equations
Authors: Alves Claudianor O. 
Published: March 2016

Abstract
In this paper, we show the existence and multiplicity of solutions for the following class of quasilinear equations
−Δpu + |u|p−2u = f(u) in Ωλ, u(x) > 0 a.e in Ωλ, u = 0 on ∂ Ωλ

where Ωλ = λΩ, Ω is a bounded domain in ℝN, λ is a positive parameter, 2 ≤ p < N, f is a continuous functions, and Δpu = div(|▽u|p−2▽u) is the p-Laplacian operator. Here, we use variational method to get multiplicity of solution involving the Lusternick- Schnirelman category of B̅ ∥∂ Ω̅ in itself.
Solutions of Multiparameter Systems of Elliptic Differential Equations
Authors: Gawrycka Joanna , Rybicki Slawomir 
Published: March 2016

Abstract
In this article we study bifurcations of weak solutions of the following multiparameter variational system of elliptic differential equations:

We formulate necessary and sufficient conditions for the existence of bifurcation points and global bifurcation points of weak solutions of this system.
Unbounded Motions of Perturbed Isochronous Hamiltonian Systems at Resonance
Authors: Fabry Christian , Fonda Alessandro 
Published: March 2016

Abstract
Large amplitude solutions of asymptotically positively homogeneous perturbations of hamiltonians systems at resonance can be unbounded, either in the past, or in the future. We present conditions for boundedness or unboundedness, generalizing in particular the results obtained by Alonso and Ortega [1] for scalar second order equations with asymmetric nonlinearities.
Locating the Peaks of Semilinear Elliptic Systems
Authors: Pomponio Alessio , Squassina Marco 
Published: March 2016

Abstract
We consider a system of weakly coupled singularly perturbed semilinear elliptic equations. First, we obtain a Lipschitz regularity result for the associated ground energy function Σ as well as representation formulas for the left and the right derivatives. Then, we show that the concentration points of the solutions locate close to the critical points of Σ in the sense of subdifferential calculus.
Variational Eigenvalues of Degenerate Eigenvalue Problems for the Weighted p-Laplacian
Authors: Lê An , Schmitt Klaus 
Published: March 2016

Abstract
We prove the existence of nondecreasing sequences of positive eigenvalues of the homogeneous degenerate quasilinear eigenvalue problem − div(a(x)|▽u|p-2▽u) = λb(x)|u|p-2u, λ > 0 subject to Dirichlet boundary conditions on a bounded domain . The diffusion coefficient a(x) is a function in L1
loc(Ω) and b(x) is a nontrivial function in Lr(Ω) (r depending on a, p and N) and may change sign. We use Ljusternik-Schnirelman theory, minimax theory and the theory of weighted Sobolev spaces to establish our results.
On the Prescribed Scalar and Zero Mean Curvature on 3-Dimensional Manifolds With Umbilic Boundary
Authors: Ahmedou Mohameden Ould 
Published: March 2016

Abstract
In this paper we consider the existence and the compactness of Riemannian metrics of prescribed mean curvature and zero boundary mean curvature on a three dimensional manifold with umbilic boundary (M, g0). We prove that for three dimensional manifolds with umbilic boundaries, which are not conformally equivalent to the three dimensional standard half sphere, any positive function can be realized as the scalar curvature of a Riemannian metric g conformal to g0 with respect to which the boundary has zero mean curvature. Moreover, all such metrics stay bounded with respect to the C2,α -topology and in the nondegerate case Morse inequalities hold.
The p-Laplace Heat Equation With a Source Term: Self-similar Solutions Revisited
Authors: Bidaut-Véron Marie Françoise 
Published: March 2016

Abstract
We study the self-similar solutions of any sign of the equation
ut - div(|▽u|p-2▽u) = |u|q-1u,
in ℝN, where p, q > 1. We extend the results of Haraux-Weissler obtained for p = 2 to the case q > p-1 > 0. In particular we study the existence of slow or fast decaying solutions. For given t > 0, the fast solutions u(t, .) have a compact support in ℝN when p > 2; and |x|p/(2-p) u(t, x) is bounded at infinity when p < 2: We describe the behaviour for large |x| of all the solutions. According to the position of q with respect to the first critical exponent p - 1 + p/N and the critical Sobolev exponent q*, we study the existence of positive solutions, or the number of the zeros of u(t, .). We prove that any solution u(t, .) is oscillatory when p < 2 and q is closed to 1.
Multiplicity of Solutions For a Convex-concave Problem With a Nonlinear Boundary Condition
Authors: Abreu Emerson A.M. , Carrião Paulo C. , Miyagaki Olímpio H. 
Published: March 2016

Abstract
We study the existence of multiple positive solutions for a convex-concave problem, denoted by (Pλμ), with a nonlinear boundary condition involving two critical exponents and two positive parameters λ and μ. We obtain a continuous strictly decreasing function f such that K1 ≡ {(f(μ), μ) : μ ∈ [0, ∞)} divides [0, ∞) × [0, ∞) \ {(0, 0)} in two connected sets K0 and K2 such that problem (Pλμ) has at least two solutions for (λ, μ) ∈ K2, at least one solution for (λ, μ) ∈ K1 and no solution for (λ, μ) ∈ K0.
Multiple Positive Solutions For Nonautonomous Quasicritical Elliptic Problems in Unbounded Domains
Authors: Cerami Giovanna , Molle Riccardo 
Published: March 2016

Abstract
The problem

with boundary Dirichlet zero data is considered in an exterior domain Ω ⊂ ℝN. Assuming that, as ε →0, aε concentrates and blows up at a point of Ω, namely

the existence of at least 2 distinct positive solutions is proved, if

is suitably small. Furthermore, if aε(x) has a suitable behaviour at infinity, the existence of another positive solution is shown.
Uniqueness and Exact Multiplicity of Solutions For Non-autonomous Dirichlet Problems
Authors: Korman Philip 
Published: March 2016

Abstract
We consider positive solutions for a class of non-autonomous equations on a unit ball in Rn

Δu + f(|x|, u) = 0 for |x| < 1, u= 0 when |x| = 1.
We assume that fr(r, u) ≤ 0, so that in view of [8] all positive solutions are radially symmetric. If f(|x|, u) = a(|x|)g(u), we obtain several exact multiplicity results for a class of convex-concave g(u), with g(0) = 0. In another direction, we obtain uniqueness and non-degeneracy of positive solutions for a class of equations, modeled on f(|x|, u) = −a(|x|)u + b(|x|)up, with

.
Concentration Phenomena in a Biharmonic Equation Involving the Critical Sobolev Exponent
Authors: Selmi Abdelbaki 
Published: March 2016

Abstract
In this paper, we consider the problem
Δ2u = |u|8/(n-4)u + εf(x, u)
in Ω, u = Δu = 0 on ∂Ω, where Ω is a bounded and smooth domain in ℝn, n ≥ 6, ε is a small positive parameter, and f is a smooth function. Our main purpose is to construct families of solutions which concentrate around some well defined points depending on f.
On the Fixed Homogeneous Circle Problem
Authors: Azevêdo C. , Ontaneda P. , Cabral H. E. 
Published: March 2016

Abstract
We give some results about the dynamics of a particle moving in Euclidean three-space under the influence of the gravitational force induced by a fixed homogeneous circle. Our main results concern (1) singularities and (2) the dynamics in the plane that contains the circle. The study presented here is purely analytic.
Existence and Concentration of Positive Solutions For Coupled Nonlinear Schrödinger Systems in ℝN
Authors: Wan Youyan 
Published: March 2016

AbstractThe aim of this paper is to study the existence and concentration of positive solutions for the coupled nonlinear Schrödinger systemwhere ε is a small positive number, N ≥ 3, p, q > 1 satisfyand W(x), Q(x), K(x) are continuous and bounded positive functions defined in ℝN. Combining the dual variational methods with mountain pass theorem, we prove under some conditions on W, Q, K the existence of a family of positive solutions concentrating at a point where related functionals achieve their minimum energy.