bluuebunny/crossref_metadata_2025_split huggingface dataset:
A monolithic strategy for fluid–structure interaction problems
Authors: Jog C. S. , Pal R. K. 
Published: August 2010

AbstractIn this work, we present a new monolithic strategy for solving fluid–structure interaction problems involving incompressible fluids, within the context of the finite element method. This strategy, similar to the continuum dynamics, conserves certain properties, and thus provides a rational basis for the design of the time‐stepping strategy; detailed proofs of the conservation of these properties are provided. The proposed algorithm works with displacement and velocity variables for the structure and fluid, respectively, and introduces no new variables to enforce velocity or traction continuity. Any existing structural dynamics algorithm can be used without change in the proposed method. Use of the exact tangent stiffness matrix ensures that the algorithm converges quadratically within each time step. An analytical solution is presented for one of the benchmark problems used in the literature, namely, the piston problem. A number of benchmark problems including problems involving free surfaces such as sloshing and the breaking dam problem are used to demonstrate the good performance of the proposed method. Copyright © 2010 John Wiley & Sons, Ltd.
Spectral stochastic two‐scale convergence method for parabolic PDEs
Authors: Jardak M. , Navon I. M. 
Published: August 2010

AbstractFollowing the theory of two‐scale convergence method introduced by Nguetseng (SIAM J. Math. Anal.1989;20:608–623) and further developed by Allaire (SIAM J. Math. Anal.1992;23:1482–1518), we introduce the chaos two‐scale method as a spectral stochastic tool to tackle parabolic partial differential equations where the material properties are stochastic processes σε(t, x, ω) of the form σ(t, x, t/εγ,x/ε, ω), oscillating in both space and time variables with different speeds. Periodicity with respect to the fast or local variables is assumed, and, stationary Gaussian material properties processes are considered. Copyright © 2010 John Wiley & Sons, Ltd.
Finite difference analysis of a double‐porosity consolidation model
Authors: Boal N. , Gaspar F. J. , Lisbona F. J. , Vabishchevich P. N. 
Published: August 2010

AbstractThis work deals with the numerical solution of a two‐dimensional double‐porosity consolidation problem using a finite difference scheme. Stabilized discretizations using staggered grids in both space and time are proposed. A priori estimates for displacements and pressures in discrete energy norms are obtained, and the corresponding convergence results are given. Numerical examples illustrate the convergence properties of the proposed numerical scheme. © 2010 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 28: 138–154, 2012
The Crank‐Nicolson/Adams‐Bashforth scheme for the time‐dependent Navier‐Stokes equations with nonsmooth initial data
Authors: He Yinnian 
Published: August 2010

AbstractIn this article, we study the stability and convergence of the Crank‐Nicolson/Adams‐Bashforth scheme for the two‐dimensional nonstationary Navier‐Stokes equations with a nonsmooth initial data. A finite element method is applied for the spatial approximation of the velocity and pressure. The time discretization is based on the implicit Crank‐Nicolson scheme for the linear terms and the explicit Adams‐Bashforth scheme for the nonlinear term. Moreover, we prove that the scheme is almost unconditionally stable for a nonsmooth initial data u0 with div u0 = 0, i.e., the time step τ satisfies: τ ≤ C0 if u0 ∈ H1 ∩ L∞; τ |log h| ≤ C0 if u0 ∈ H1 for the mesh size h and some positive constant C0. Finally, we obtain some error estimates for the discrete velocity and pressure under the above stability condition. © 2010 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 28: 155‐187, 2012
Numerical analysis of the error in the sound power predicted through the Lighthill acoustic analogy
Authors: Lozovskiy Alexander V. 
Published: August 2010

AbstractThis article gives rigorous numerical analysis of the error in prediction of aeroacoustic noise via Lighthill analogy. The first fundamental and intractable problem considered herein is to predict the sound power generated by aerodynamic noise on surfaces. We give a full analysis of three methods of prediction. The second fundamental difficulty in the numerical analysis of aeroacoustics is the limited regularity of the underlying turbulent flow. This is treated herein by giving a negative norm error analysis which reduces the required regularity. We also give a comprehensive analysis of a fully discrete scheme including effects of the error coming into acoustic equation from the turbulent flow simulation. © 2010 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 28: 204–234,2012
Solitary wave solutions of the MRLW equation using radial basis functions
Authors: Dereli Yilmaz 
Published: August 2010

AbstractIn this study, traveling wave solutions of the modified regularized long wave (MRLW) equation are simulated by using the meshless method based on collocation with well‐known radial basis functions. The method is tested for three test problems which are single solitary wave motion, interaction of two solitary waves and interaction of three solitary waves. Invariant values for all test problems are calculated, also L2, L∞ norms and values of the absolute error for single solitary wave motion are calculated. Numerical results by using the meshless method with different radial basis functions are presented. Figures of wave motions for all test problems are shown. Altogether, meshless methods with radial basis functions solve the MRLW equation very satisfactorily.© 2010 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 28: 235–247, 2012
A new stabilized finite element method for optimal control for a Ladyzhenskaya model for unsteady flows
Authors: Gao Zhiming , Kong Fande , Ma Yichen 
Published: August 2010

AbstractThis article considers the time‐dependent optimal control problem of tracking the velocity for the viscous incompressible flows which is governed by a Ladyzhenskaya equations with distributed control. The existence of the optimal solution is shown and the first‐order optimality condition is established. The semidiscrete‐in‐time approximation of the optimal control problem is also given. The spatial discretization of the optimal control problem is accomplished by using a new stabilized finite element method which does not need a stabilization parameter or calculation of high order derivatives. Finally a gradient algorithm for the fully discrete optimal control problem is effectively proposed and implemented with some numerical examples. © 2010 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 28: 263–287, 2012
Fully discrete interior penalty discontinuous Galerkin methods for nonlinear parabolic equations
Authors: Song Lunji 
Published: August 2010

AbstractIn this article, we investigate interior penalty discontinuous Galerkin (IPDG) methods for solving a class of two‐dimensional nonlinear parabolic equations. For semi‐discrete IPDG schemes on a quasi‐uniform family of meshes, we obtain a priori bounds on solutions measured in the L2 norm and in the broken Sobolev norm. The fully discrete IPDG schemes considered are based on the approximation by forward Euler difference in time and broken Sobolev space. Under a restriction related to the mesh size and time step, an hp ‐version of an a priori l∞(L2) and l2(H1) error estimate is derived and numerical experiments are presented.© 2010 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 28: 288–311, 2012
Osteoarthritis and activity—an analysis of the relationship between eburnation, Musculoskeletal Stress Markers (MSM) and age in two Neolithic hunter–gatherer populations from Gotland, Sweden
Authors: Molnar Petra , Ahlstrom Torbjorn P. , Leden Ido 
Published: August 2010

AbstractThe occurrence of osteoarthritis (OA) as an indicator of physical activity was explored in two Middle Neolithic samples from Gotland (c. 3400–2300 BC) in the Baltic Sea: Ajvide (n = 46) and Västerbjers (n = 32). The difficulty in diagnosing OA is recognised and only eburnation was used as a definite criterion for OA. The relationship between eburnation lesions and Musculoskeletal Stress Markers (MSM) was investigated particularly in relation to age, but also with reference to patterns of sex, body side and site. Results show that increasing prevalence of eburnation as well as increased MSM scores was highly correlated with age. In the combined sample, females exhibited higher frequencies of eburnation, while total MSM mean scores were higher in males. Significantly higher MSM mean scores were also found in those individuals with eburnation lesions. Västerbjers exhibited higher frequencies of eburnation as well as higher mean MSM scores, which in part may be explained by the difference in age distribution at the two sites. However, the differences in both eburnation and MSM patterns between the sexes, and between age groups as well as between the two sites indicate that other factors also have to be considered. These may include genetic predisposition and possibly activity, although, a direct link (other than age) between eburnation and MSM was difficult to discern. Copyright © 2009 John Wiley & Sons, Ltd.
A µ‐dependent approach toH∞control of uncertain switched linear systems with average dwell time
Authors: Zhang Lixian , Boukas El‐Kebir , Shi Peng , Chen Zhaobo 
Published: August 2010

AbstractThis paper concernsH∞control problem for a class of discrete‐time uncertain switched linear systems with average dwell time. The stability result for general discrete‐time switched systems is first explored, and a µ‐dependent approach is then introduced for the considered systems to theH∞controller solution. A mode‐dependent state‐feedback controller is designed such that the resulting closed‐loop system is robust exponentially stable and has a prescribed exponentialH∞performance index. The µ‐dependent existence conditions of desired controller and admissible switching signals are derived and formulated in terms of linear matrix inequalities (LMIs). A numerical example is given to demonstrate the effectiveness of the developed theoretical results. Copyright © 2009 John Wiley & Sons, Ltd.
Screen‐printed Emitter‐Wrap‐Through solar cell with single step side selective emitter with 18.8% efficiency
Authors: Mingirulli N. , Stüwe D. , Specht J. , Fallisch A. , Biro D. 
Published: August 2010

AbstractA fabrication process for Emitter‐Wrap‐Through solar cells on monocrystalline material with high quality gap passivation by wet thermal silicon dioxide is investigated. Masking and structuring steps are performed by screen‐printing technology. Via‐holes are created by an industrially applicable high‐speed laser drilling process. The cell structure features a selective emitter structure fabricated in a single high temperature step: a highly doped emitter at the via‐holes and the rear side, allowing for a low via‐hole resistivity as well as a low resistivity contact to screen‐printed pastes, and a moderately doped front side emitter exhibiting high quantum efficiency in the low wavelength range. Therefore a novel approach is applied depositing either doped or undoped PECVD silicon dioxide layers on the front side. It is shown that doping profiles advantageous for the EWT‐cell structure can be achieved. The screen‐printed aluminum paste is found to penetrate the underlying thermal dioxide layer at appropriate contact firing conditions leading to a zone of high recombination in the overlap region of aluminum and silicon dioxide. It is shown that conventional PECVD‐anti‐reflection silicon nitride acts as effective protection layer reducing the recombination in this region. Designated area conversion efficiencies up to 18.8% on FZ material are obtained applying the single step side selective emitter fabrication technique. Copyright © 2010 John Wiley & Sons, Ltd.
Numerical analysis of J–V characteristics of a polymer solar cell
Authors: Mitroi Mihai Razvan , Iancu Vladimir , Fara Laurentiu , Ciurea Magdalena Lidia 
Published: August 2010

AbstractA numerical method to determine the cell parameters from the analysis of the J–V characteristics of a polymer solar cell is proposed. This method uses the equations given by the diode model, experimental data from the literature, and an adequate fitting procedure with seven fit parameters. Different aspects of the obtained results are discussed. Information concerning cell design optimization is also obtained. The method is of general application in the field of polymer solar cells, as well as to any kind of diode‐like cell. Copyright © 2010 John Wiley & Sons, Ltd.
Real‐time reliability test for a CPV module based on a power degradation model
Authors: González J.R. , Vázquez M. , Algora C. , Núñez N. 
Published: August 2010

AbstractModels based on degradation are powerful and useful tools to evaluate the reliability of those devices in which failure happens because of degradation in the performance parameters. This paper presents a procedure for assessing the reliability of concentrator photovoltaic (CPV) modules operating outdoors in real‐time conditions. With this model, the main reliability functions are predicted. This model has been applied to a real case with a module composed of GaAs single‐junction solar cells and total internal reflection (TIR) optics. Copyright © 2010 John Wiley & Sons, Ltd.
Combined therapy versus usual care for the treatment of depression in oncologic patients: a randomized controlled trial
Authors: Rodríguez Vega B. , Palao A. , Torres G. , Hospital A. , Benito G. , Pérez E. , Dieguez M. , Castelo B. , Bayón C. 
Published: August 2010

AbstractObjective: To compare narrative therapy (NT) plus escitalopram versus escitalopram plus usual care on quality of life and depressive symptomatology of depressed patients with oncologic disease.Methods: A total of 72 subjects (mean age 54.6 years), predominantly female with non‐metastatic breast, lung and colon cancer and depressive disorder (DSM‐IV‐TR) were randomized to receive treatment with NT plus escitalopram (n=39) or escitalopram (10–20 mg QD) plus usual care (n=33). Main endpoints were improvement in dimensions of quality of life measured by the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire C‐30 and reduction of depressive symptoms using the Hospital Anxiety and Depression Scale at weeks 12 and 24.Results: The combined therapy group showed significantly greater improvement in all the functioning dimensions (p<0.01), pain scale (p=0.02), global health (p=0.02), and global quality of life (p=0.007) at weeks 12 and 24. There were no statistically significant differences in depressive symptomatology between the groups. From week 12 to week 24 study retention was higher in the combined treatment group (p=0.01).Conclusions: Brief NT in combination with escitalopram was superior to usual care and escitalopram in improving functioning dimensions of quality life. Copyright © 2010 John Wiley & Sons, Ltd.
Identification of patient‐reported distress by clinical nurse specialists in routine oncology practice: a multicentre UK study
Authors: Mitchell Alex J. , Hussain Nadia , Grainger Lorraine , Symonds Paul 
Published: August 2010

AbstractBackground: There is uncertainty regarding how well clinical nurse specialists are able to identify distress in cancer settings.Methods: We examined recognition of patient‐reported distress by nurse specialists across three sites in the East Midlands (UK). Clinicians were asked to report on their clinical opinion regarding the presence of distress or any mental health complication after routine assessment of 401 mixed cancer patients. Patient‐reported distress was defined by the distress thermometer at a cut‐off of 4 or higher.Results: We found that the prevalence of patient‐reported distress was 45.4%. The rates for mild, moderate and severe distress were: 23.4, 13.7 and 8.2, respectively. When looking for distress (or any mental health complication) nurse practitioners had a detection sensitivity of 50.5% and specificity 80.0%. Cohen's kappa suggested fair agreement between staff and patients. Examining predictors of distress, clinicians were better able to recognise higher severities of distress (adjusted R2=0.87 P=0.001). There was lower sensitivity in palliative stages but no differences according to the type of cancer. There was also higher sensitivity but lower specificity in those clinicians with high self‐rated confidence.Conclusions: Nurses working in cancer settings have difficulty identifying distress using their routine clinical judgement and tend to make more false‐negative than false‐positive errors. Evidence‐based strategies that improve detection of mild and moderate distress are required in routine cancer care. Copyright © 2010 John Wiley & Sons, Ltd.
Can health beliefs help in explaining attendance to follow‐up care? The Swiss Childhood Cancer Survivor Study
Authors: Michel Gisela , Kuehni Claudia E. , Rebholz Cornelia E. , Zimmermann Karin , Eiser Christine , Rueegg Corina S. , von der Weid Nicolas X. ,   for the Swiss Paediatric Oncology Group (SPOG)
Published: August 2010

AbstractObjective: Improved treatment has increased the survival of childhood cancer patients in recent decades, but follow‐up care is recommended to detect and treat late effects. We investigated relationships between health beliefs and follow‐up attendance in adult childhood cancer survivors.Methods: Childhood cancer survivors aged younger than 16 years when diagnosed between 1976 and 2003, who had survived for more than 5 years and were currently aged 20+ years, received a postal questionnaire. We asked survivors whether they attended follow‐up in the past year. Concepts from the Health Belief Model (perceived susceptibility and severity of future late effects, potential benefits and barriers to follow‐up, general health value and cues to action) were assessed. Medical information was extracted from the Swiss Childhood Cancer Registry.Results: Of 1075 survivors (response rate 72.3%), 250 (23.3%) still attended regular follow‐up care. In unadjusted analyses, all health belief concepts were significantly associated with follow‐up (p<0.05). Adjusting for other health beliefs, demographic, and medical variables, only barriers (OR=0.59; 95%CI: 0.43–0.82) remained significant. Younger survivors, those with lower educational background, diagnosed at an older age, treated with chemotherapy, radiotherapy, or bone marrow transplantation and with a relapse were more likely to attend follow‐up care.Conclusions: Our study showed that more survivors at high risk of cancer‐ and treatment‐related late effects attend follow‐up care in Switzerland. Patient‐perceived barriers hinder attendance even after accounting for medical variables. Information about the potential effectiveness and value of follow‐up needs to be available to increase the attendance among childhood cancer survivors. Copyright © 2010 John Wiley & Sons, Ltd.
Etiologies of spontaneous pneumomediastinum in children in middle Taiwan
Authors: Lee Chia‐Ying , Wu Chou‐Chieh , Lin Ching‐Yuang 
Published: August 2010

AbstractIntroductionSpontaneous pneumomediastinum (SPM), while rare, is probably underestimated in children. Treatment targets on the underlying disease and trigger factors. The study aimed in analysis different etiology in different age groups.Patients and MethodsTotal 37 children with SPM were analyzed from two medical centers in middle Taiwan from 1994 to 2007.ResultsIncidence of SPM in children was 1:11,726 patients at Department of Pediatric Emergency in middle Taiwan. Bimodal peak in incidence occurred in those under 7 and in those aged 15–18 years old. The Characteristic symptoms were dyspnea (64.9%), followed by chest pain (62.2%) and neck pain (40.5%); common specific physical signs were subcutaneous emphysema (SCE) (67.6%) and Hammer's sign (13.5%). Trigger factors were infection (43.2%), asthma (21.0%), esophageal rupture (5.4%), foreign body aspiration (2.7%), and diabetic ketoacidosis (2.7%). Idiopathic SPM accounted for 35.1% of patients with mean age 14.1 years. In age distribution, preschoolers (<7 years old) got SPM mostly due to lower respiratory tract infection. In adolescents, the most common etiologies were asthma and upper respiratory tract infection. Mean hospitalization was 6.4 days. Although 17 (46.0%) patients needed intensive care, nearly all had complete resolution in chest radiography before discharge.ConclusionClinician should keep alert to incidence of SPM from these symptoms. Etiologies varied with age and treatment must target on factors and underlying disease. Pediatr. Pulmonol. 2010; 45:869–873. © 2010 Wiley‐Liss, Inc.
Influence of heat treatment on the vacancy content at the B‐site in the ABO3 manganites La0.6Sr0.1MnO3−δ
Authors: Liu S. P. , Zhang Y. G. , Tang G. D. , Qi W. H. , Ji D. H. , Li Y. F. , Liu G. H. , Xie Y. , Chen W. , Hou D. L. 
Published: August 2010

AbstractThe effects of heat‐treatment temperature, THT, and heat‐treatment time, tHT, on the structural and magnetic properties of manganites with a nominal composition La0.6Sr0.1MnO3−δ, prepared by the sol–gel method, were investigated. The XRD spectra indicate that the samples have two phases with the $R\overline {3} c$ perovskite being the dominant phase and Mn3O4 being the second phase. It was found that the Curie temperature of the samples varies as THT and tHT are changed. Calculation of the ion content ratios at the A, B, and O sites in the ABO3 perovskite phase on the basis of the thermal equilibrium theory of crystal defects, and Rietveld fitting of X‐ray powder diffraction data lead us to believe that the origin of this variation is due to the fact that the vacancy content, z, at B‐sites in the ABO3 perovskite phase increases as THT and tHT increase. The calculations also show that the samples are double‐phase compositions of La0.6Sr0.1Mn1−yO1.5(1.7‐y+z)/(Mn3O4)y/3.
Robotic‐assisted minimally invasive surgery; a useful tool in resident training—the Peoria experience, 2002–2009
Authors: Huettner Franziska , Dynda Danuta , Ryan Michael , Doubet Jamie , Crawford David L. 
Published: August 2010

AbstractBackgroundThe purpose of this study was to review the use of robotic‐assisted general surgery at our institution. We evaluated the 8 year experience of one minimally invasive surgery (MIS) fellowship‐trained surgeon in Peoria, IL, performing 240 cases of foregut, colon, solid organ and biliary surgery using the da Vinci system, with resident assistance. Foregut and colon procedures are the fifth and sixth most commonly performed procedures of the senior author annually.MethodsAn IRB‐approved retrospective review of prospectively collected data representing 124 foregut and 102 colon operations was performed. Data analysed were procedure performed and indications for surgery, gender, age, body mass index (BMI), estimated blood loss (EBL), port set‐up time (PST), robot operating time (ROT), total case time (TCT), length of stay (LOS), complications, conversions and resident involvement were recorded. Fourteen cases were excluded from the data review. Statistical analysis using the ANOVA test was applied. A specific review of resident participation was performed.ResultsTimes for 226 foregut and colon cases were: PST 31.2 ± 9.4 (range 10–64) min, ROT 119.3 ± 41.5 (range 12–306) min, and TCT 194.8 ± 50.3 (range 50–380) min. The EBL was 48.6 ± 55.0 (range 5–500) ml, BMI 28.5 ± 4.7 (range 15.4–46.8) kg/m2, and median LOS 2.0 (range 0–27) days. The overall complication rate was 13.3%. No deaths occurred. Over the 8 year study period the number of cases participated in by residents was 0, 16, 22, 15, 29, 26, 28 and 10 (as of June 2009), respectively.ConclusionThis series demonstrates the technical feasibility and safety of robotic surgery for the foregut and colon in a clinical setting where the surgeon does far more of other types of MIS. This series compares favorably with the literature. Incorporation of robotic training in the curriculum has allowed residents to learn robotic techniques in an effective manner. Copyright © 2010 John Wiley & Sons, Ltd.