bluuebunny/crossref_metadata_2025_split huggingface dataset:
Balance in Relation to Walking Deterioration in Adults With Spastic Bilateral Cerebral Palsy
Authors: Opheim Arve , Jahnsen Reidun , Olsson Elisabeth , Stanghelle Johan Kvalvik 
Published: October 2011

Background
Balance function is central in walking, and impaired balance function may be related to walking deterioration in adults with spastic bilateral cerebral palsy (CP).

Objectives
The purposes of this study were: (1) to compare balance confidence, fear of falling, and balance ability in adults with spastic bilateral CP, with and without self-reported walking deterioration; (2) to characterize balance confidence, fear of falling, and balance ability across all participants; and (3) to examine the relationship between balance confidence and balance ability across all participants.

Design
A case-control design was used.

Methods
Sixteen adults from a 7-year follow-up study who had spastic bilateral CP and were under 40 years of age in the 2006 survey participated. Eight participants reported walking deterioration (cases), and 8 participants did not report walking deterioration (controls). Outcome variables were: the Activities-specific Balance Confidence (ABC) Scale, the Falls Efficacy Scale–International (FES-I), and the Balance Evaluation Systems Test (BESTest).

Results
No differences in any of the outcome variables were found between the cases and the controls. Across all participants, the ABC Scale and FES-I scores were 62% and 24 points, respectively. Reduced ABC Scale scores and increased FES-I scores were found when using escalators, walking in crowds, and walking on slippery surfaces. The BESTest subscale scores were 60% to 79% of the maximum score, but only 31% and 42% of the maximum score in postural responses and anticipatory adjustments, respectively. Balance confidence correlated positively with postural responses, sensory orientation, stability in gait, and BESTest total score.

Limitations
The lack of reliability and validity tests for the outcome variables in this study population and the small number of participants were limitations of the study.

Conclusions
Self-reported walking deterioration in this group could not be explained by differences in balance confidence, fear of falling, or balance ability. Across all participants, most balance problems seemed related to reduced postural responses and anticipatory adjustments.
A Modified Discontinuous Galerkin Method for Solving Efficiently Helmholtz Problems
Authors: Grigoroscuta-Strugaru Magdalena , Amara Mohamed , Calandra Henri , Djellouli Rabia 
Published: October 2011

AbstractA new solution methodology is proposed for solving efficiently Helmholtz problems. The proposed method falls in the category of the discontinuous Galerkin methods. However, unlike the existing solution methodologies, this method requires solving (a) well-posed local problems to determine the primal variable, and (b) a global positive semi-definite Hermitian system to evaluate the Lagrange multiplier needed to restore the continuity across the element edges. Illustrative numerical results obtained for two-dimensional interior Helmholtz problems are presented to assess the accuracy and the stability of the proposed solution methodology.
Analysis of Convolution Quadrature Applied to the Time-Domain Electric Field Integral Equation
Authors: Chen Q. , Monk P. , Wang X. , Weile D. 
Published: October 2011

AbstractWe show how to apply convolution quadrature (CQ) to approximate the time domain electric field integral equation (EFIE) for electromagnetic scattering. By a suitable choice of CQ, we prove that the method is unconditionally stable and has the optimal order of convergence. Surprisingly, the resulting semi discrete EFIE is dispersive and dissipative, and we analyze this phenomena. Finally, we present numerical results supporting and extending our convergence analysis.
A Preconditioned Iterative Solver for the Scattering Solutions of the Schrödinger Equation
Authors: Zubair Hisham bin , Reps Bram , Vanroose Wim 
Published: October 2011

AbstractThe Schrödinger equation defines the dynamics of quantum particles which has been an area of unabated interest in physics. We demonstrate how simple transformations of the Schrödinger equation leads to a coupled linear system, whereby each diagonal block is a high frequency Helmholtz problem. Based on this model, we derive indefinite Helmholtz model problems with strongly varying wavenumbers. We employ the iterative approach for their solution. In particular, we develop a preconditioner that has its spectrum restricted to a quadrant (of the complex plane) thereby making it easily invertible by multigrid methods with standard components. This multigrid preconditioner is used in conjunction with suitable Krylov-subspace methods for solving the indefinite Helmholtz model problems. The aim of this study is to report the feasibility of this preconditioner for the model problems. We compare this idea with the other prevalent preconditioning ideas, and discuss its merits. Results of numerical experiments are presented, which complement the proposed ideas, and show that this preconditioner may be used in an automatic setting.
Matched Asymptotic Expansions of the Eigenvalues of a 3-D Boundary-Value Problem Relative to Two Cavities Linked by a Hole of Small Size
Authors: Bendali Abderrahmane , Fares M’Barek , Tizaoui Abdelkader , Tordeux Sébastien 
Published: October 2011

AbstractIn this article, we consider a domain consisting of two cavities linked by a hole of small size. We derive a numerical method to compute an approximation of the eigenvalues of an elliptic operator without refining in the neighborhood of the hole. Several convergence rates are obtained and illustrated by numerical simulations.
Multiscale Nanorod Metamaterials and Realizable Permittivity Tensors
Authors: Bouchitté G. , Bourel C. 
Published: October 2011

AbstractOur aim is to evidence new 3D composite diffractive structures whose effective permittivity tensor can exhibit very large positive or negative real eigenvalues. We use a reiterated homogenization procedure in which the first step consists in considering a bounded obstacle made of periodically disposed parallel high conducting metallic fibers of finite length and very thin cross section. As shown in [2], the resulting constitutive law is non-local. Then by reproducing periodically the same kind of obstacle at small scale, we obtain a local effective law described by a permittivity tensor that we make explicit as a function of the frequency. Due to internal resonances, the eigenvalues of this tensor have real part that change of sign and are possibly very large within some range of frequencies. Numerical simulations are shown.
Simultaneous Scatterer Shape Estimation and Partial Aperture Far-Field Pattern Denoising
Authors: Olshansky Yaakov , Turkel Eli 
Published: October 2011

AbstractWe study the inverse problem of recovering the scatterer shape from the far-field pattern(FFP) in the presence of noise. Furthermore, only a discrete partial aperture is usually known. This problem is ill-posed and is frequently addressed using regularization. Instead, we propose to use a direct approach denoising the FFP using a filtering technique. The effectiveness of the technique is studied on a scatterer with the shape of the ellipse with a tower. The forward scattering problem is solved using the finite element method (FEM). The numerical FFP is additionally corrupted by Gaussian noise. The shape parameters are found based on a least-square error estimator. If ũ∞ is a perturbation of the FFP then we attempt to find Γ, the scatterer shape, which minimizes ∣∣ũ∞ − ũ∞∣∣ using the conjugate gradient method for the denoised FFP
Time-Harmonic Acoustic Scattering in a Complex Flow: A Full Coupling Between Acoustics and Hydrodynamics
Authors: Dhia A.S.Bonnet-Ben , Mercier J.F. , Millot F. , Pernet S. , Peynaud E. 
Published: October 2011

AbstractFor the numerical simulation of time harmonic acoustic scattering in a complex geometry, in presence of an arbitrary mean flow, the main difficulty is the coexistence and the coupling of two very different phenomena: acoustic propagation and convection of vortices. We consider a linearized formulation coupling an augmented Galbrun equation (for the perturbation of displacement) with a time harmonic convection equation (for the vortices). We first establish the well-posedness of this time harmonic convection equation in the appropriate mathematical framework. Then the complete problem, with Perfectly Matched Layers at the artificial boundaries, is proved to be coercive + compact, and a hybrid numerical method for the solution is proposed, coupling finite elements for the Galbrun equation and a Discontinuous Galerkin scheme for the convection equation. Finally a 2D numerical result shows the efficiency of the method.
Operator Factorization for Multiple-Scattering Problems and an Application to Periodic Media
Authors: Coatléven J. , Joly P. 
Published: October 2011

AbstractThis work concerns multiple-scattering problems for time-harmonic equations in a reference generic media. We consider scatterers that can be sources, obstacles or compact perturbations of the reference media. Our aim is to restrict the computational domain to small compact domains containing the scatterers. We use Robin-to-Robin (RtR) operators (in the most general case) to express boundary conditions for the interior problem. We show that one can always factorize the RtR map using only operators defined using single-scatterer problems. This factorization is based on a decomposition of the diffracted field, on the whole domain where it is defined. Assuming that there exists a good method for solving single-scatterer problems, it then gives a convenient way to compute RtR maps for a random number of scatterers.
A Preconditioned 3-D Multi-Region Fast Multipole Solver for Seismic Wave Propagation in Complex Geometries
Authors: Chaillat S. , Semblat J.F. , Bonnet M. 
Published: October 2011

AbstractThe analysis of seismic wave propagation and amplification in complex geological structures requires efficient numerical methods. In this article, following up on recent studies devoted to the formulation, implementation and evaluation of 3-D single- and multi-region elastodynamic fast multipole boundary element methods (FM-BEMs), a simple preconditioning strategy is proposed. Its efficiency is demonstrated on both the single- and multi-region versions using benchmark examples (scattering of plane waves by canyons and basins). Finally, the preconditioned FM-BEM is applied to the scattering of plane seismic waves in an actual configuration (alpine basin of Grenoble, France), for which the high velocity contrast is seen to significantly affect the overall efficiency of the multi-region FM-BEM.
A High Frequency Boundary Element Method for Scattering by Convex Polygons with Impedance Boundary Conditions
Authors: Chandler-Wilde S. N. , Langdon S. , Mokgolele M. 
Published: October 2011

AbstractWe consider scattering of a time harmonic incident plane wave by a convex polygon with piecewise constant impedance boundary conditions. Standard finite or boundary element methods require the number of degrees of freedom to grow at least linearly with respect to the frequency of the incident wave in order to maintain accuracy. Extending earlier work by Chandler-Wilde and Langdon for the sound soft problem, we propose a novel Galerkin boundary element method, with the approximation space consisting of the products of plane waves with piecewise polynomials supported on a graded mesh with smaller elements closer to the corners of the polygon. Theoretical analysis and numerical results suggest that the number of degrees of freedom required to achieve a prescribed level of accuracy grows only logarithmically with respect to the frequency of the incident wave.
Performance Analysis of a High-Order Discontinuous Galerkin Method Application to the Reverse Time Migration
Authors: Baldassari Caroline , Barucq Hélène , Calandra Henri , Denel Bertrand , Diaz Julien 
Published: October 2011

AbstractThis work pertains to numerical aspects of a finite element method based discontinuous functions. Our study focuses on the Interior Penalty Discontinuous Galerkin method (IPDGM) because of its high-level of flexibility for solving the full wave equation in heterogeneous media. We assess the performance of IPDGM through a comparison study with a spectral element method (SEM). We show that IPDGM is as accurate as SEM. In addition, we illustrate the efficiency of IPDGM when employed in a seismic imaging process by considering two-dimensional problems involving the Reverse Time Migration.
Novel FBN1 Mutation Causes Marfan Syndrome with Bilateral Ectopia Lentis and Refractory Glaucoma
Authors: Milla Elena , Leszczynska Ania , Rey Amanda , Navarro Manuel , Larena Concepcion 
Published: October 2011

Purpose We report the case of a 41-year-old woman with bilateral lens subluxation and medically uncontrolled glaucoma in whom Marfan syndrome (MFS) was diagnosed. Methods The patient underwent complete clinical eye and systemic examinations and blood samples were drawn for mutational screening of fibrillin 1 gene (FBN1). Results The patient was diagnosed with MFS on a clinical basis and according to the Ghent criteria and the genetic testing revealed a novel heterozygous mutation in the FBN1 gene. The patient required pars plana vitrectomy with lensectomy and Ahmed valve implantation in the vitreous cavity to control her severe glaucoma. Conclusions The diagnosis of a bilateral lens luxation must be followed by complete systemic examination and genetic analysis of the FBN1 gene in order to discard MFS due to its severe systemic complications. Frequently, the condition causes an aggressive secondary glaucoma that requires surgical treatment with lensectomy, vitrectomy, and drainage device implantation in order to avoid its devastating progression toward glaucomatous optic atrophy.
The Diagnostic Accuracy of Magnetic Resonance Imaging and Ultrasonography in Gluteal Tendon Tears -A Systematic Review
Authors: Westacott Daniel J. , Minns Jonathon I. , Foguet Pedro 
Published: October 2011

Gluteal tendon tears are one of the many pathologies causing pain around the greater trochanter that are often labelled as trochanteric bursitis. We systematically reviewed the peer-reviewed literature to establish the accuracy of magnetic resonance imaging and ultrasonography in the diagnosis of gluteal tendon tears in patients with persistent lateral hip pain or Greater Trochanteric Pain Syndrome (GTPS). 7 studies met the inclusion criteria, comparing either imaging modality with a reference standard of surgical findings. Included studies were assessed for methodological quality using the QUADAS checklist. MRI had sensitivity of 33–100%, specificity of 92–100%, positive predictive value of 71–100% and negative predictive value of 50%. False-positives were common. High signal located superior to the trochanter had a stronger association with tears. Ultrasonography had a sensitivity of 79–100% and positive predictive value of 95–100%. The amount and quality of literature on the subject is limited and further well-designed studies are required to establish the optimum diagnostic strategy in this condition. Ultrasonography may prove to be the investigation of choice, despite requiring a skilled practitioner. The orthopaedic surgeon should liaise with an experienced musculoskeletal radiologist to best investigate and diagnose gluteal tendon tears in the clinical picture of GTPS.
The Politics of innocence: Soviet and Post-Soviet Animation on Folklore topics
Authors: kononenko Natalie 
Published: October 2011

Abstract
Disney did not have a monopoly on using animated folklore films for marketing purposes. During the heyday of Soviet animation in the 1970s and 1980s, cartoons that seemed to follow folktales were altered slightly to convey messages in keeping with Soviet ideology. They not only criticized capitalism, but also depicted women as sexless and selfsacrificing, and urged cooperation, neighborliness, and non violence. National minorities within the Soviet Union were portrayed as backward and in need of the guidance of Russia, the leading Soviet republic. Ukrainians, for example, were shown as cute and quaint, living in a bucolic land. Colorful clothing and tasty foods were attributed to them, as well as the ability to sing and dance. However, they were also seen as a people who believed in spirits and did not un derstand modern life. The fall of the Soviet Union and Ukrainian independence have not changed the situation, at least when it comes to animation produced in Russia. Folklore films still show Ukrainians as bucolic and musical. Women still sacrifice for the sake of others. Any animation critical of Russia, even if based on folklore, quickly disappears from the market.
Medicaid Policy Change and Immediate Postpartum Long-Acting Reversible Contraception
Authors: Rodriguez Maria I. , Meath Thomas H. A. , Watson Kelsey , Daly Ashley , McConnell K. John , Kim Hyunjee 
Published: June 2024

ImportanceImproving access to the choice of postpartum contraceptive methods is a national public health priority, and the need is particularly acute within the Medicaid population. One strategy to ensure individuals have access to the full range of contraceptive methods is the provision of a method prior to hospital discharge following a birth episode. Beginning in 2016, some states changed their Medicaid billing policy, allowing separate reimbursement for intrauterine devices and contraceptive implants to increase the provision of long-acting reversible contraceptive (LARC) methods immediately postpartum (IPP).ObjectiveTo assess the association of a change in Medicaid billing policy with use of IPP LARC.Design, Setting, and ParticipantsThe cohort study of postpartum Medicaid recipients in 9 treatment and 6 comparison states was conducted from January 2016 to October 2019. Data were analyzed from August 2023 to January 2024.Main Outcomes and MeasuresThe primary outcome was use of IPP LARC.ResultsThe final sample included 1 378 885 delivery encounters for 1 197 287 Medicaid enrollees occurring in 15 states. Mean age of beneficiaries at delivery was 27 years. The IPP LARC billing policy was associated with a mean increase of 0.74 percentage points (95% CI, 0.30-1.18 percentage points) in the immediate receipt of IPP LARC, with a prepolicy baseline rate of 0.54%. The IPP LARC billing policy was also associated with an overall increase of 1.48 percentage points (95% CI, 0.43-2.73 percentage points) in LARC use by 60 days post partum.Conclusions and RelevanceIn this cohort study, changing Medicaid billing policy to allow for separate reimbursement of LARC devices from the global fee was associated with increased use of IPP LARC, suggesting that this may be a strategy to improve access to the full range of postpartum contraceptive methods.
Beneficiary Experience of Care by Level of Integration in Dual Eligible Special Needs Plans
Authors: Mellor Jennifer M. , Cunningham Peter J. , Britton Erin , Behrens Matthew , Urmi Atika Farzana , Vega Valentina 
Published: June 2024

ImportanceDual Eligible Special Needs Plans (D-SNPs) are private managed care plans designed to promote Medicare and Medicaid integration for full-benefit, dually eligible beneficiaries. Currently, the highest level of D-SNP integration occurs in plans with exclusively aligned enrollment (EAE).ObjectiveTo compare patient experience of care, out-of-pocket spending, and satisfaction among dually enrolled Medicaid beneficiaries in D-SNPs with EAE, those in D-SNPs without EAE, and those with traditional Medicare.Design, Setting, and ParticipantsThis cross-sectional study included respondents to a mail survey fielded to a stratified random sample of full-benefit, community-dwelling, dual-eligible Medicaid beneficiaries who qualified for receipt of home and community-based services in the Virginia Medicaid Commonwealth Coordinated Care Plus program between March and October 2022.ExposureEnrollment in a D-SNP with EAE or a D-SNP without EAE vs traditional Medicare.Main Outcomes and MeasuresThe main outcomes were self-reported measures of access and delays in receiving plan approvals, out-of-pocket spending, and satisfaction with health plans’ customer service and choice of primary care and specialist physicians.ResultsOf 7200 surveys sent, 2226 were completed (response rate, 30.9%). The analytic sample consisted of 1913 Medicaid beneficiaries with nonmissing data on covariates (mean [SD] age, 70.8 [15.6] years; 1367 [71.5%] female). Of these, 583 (30.5%) were enrolled in D-SNPs with EAE, 757 (39.6%) in D-SNPs without EAE, and 573 (30.0%) in traditional Medicare. Compared with respondents enrolled in D-SNPs without EAE, those in D-SNPs with the highest level of integration (EAE) were 6.77 percentage points (95% CI, 8.81-12.66 percentage points) more likely to report being treated with courtesy and respect and 5.83 percentage points (95% CI, 0.21-11.46 percentage points) more likely to know who to call when they had a health problem. No statistically significant differences were found between members in either type of D-SNP and between those in D-SNPs and traditional Medicare in terms of their difficulty accessing care, delays in care, and satisfaction with care coordination and physician choice.Conclusions and RelevanceThis cross-sectional study found some benefits of integrating administrative processes under Medicare and Medicaid but suggests that care coordination and access improvements under full integration require additional time and/or efforts to achieve.