bluuebunny/crossref_metadata_2025_split huggingface dataset:
Validation of a full hydrodynamic model for large‐scale hydrologic modelling in the Amazon
Authors: Paiva Rodrigo C. D. , Collischonn Walter , Buarque Diogo Costa 
Published: December 2011

AbstractA key aspect of large river basins partially neglected in large‐scale hydrological models is river hydrodynamics. Large‐scale hydrologic models normally simulate river hydrodynamics using simplified models that do not represent aspects such as backwater effects and flood inundation, key factors for some of the largest rivers of the world, such as the Amazon. In a previous paper, we have described a large‐scale hydrodynamic approach resultant from an improvement of the MGB‐IPH hydrological model. It uses full Saint Venant equations, a simple storage model for flood inundation and GIS‐based algorithms to extract model parameters from digital elevation models. In the present paper, we evaluate this model in the Solimões River basin. Discharge results were validated using 18 stream gauges showing that the model is accurate. It represents the large delay and attenuation of flood waves in the Solimões basin, while simplified models, represented here by Muskingum Cunge, provide hydrographs are wrongly noisy and in advance. Validation against 35 stream gauges shows that the model is able to simulate observed water levels with accuracy, representing their amplitude of variation and timing. The model performs better in large rivers, and errors concentrate in small rivers possibly due to uncertainty in river geometry. The validation of flood extent results using remote sensing estimates also shows that the model accuracy is comparable to other flood inundation modelling studies. Results show that (i) river‐floodplain water exchange and storage, and (ii) backwater effects play an important role for the Amazon River basin hydrodynamics. Copyright © 2011 John Wiley & Sons, Ltd.
Estimation of dynamic panel data models with sample selection
Authors: Semykina Anastasia , Wooldridge Jeffrey M. 
Published: December 2011

SUMMARYWe propose a new method for estimating dynamic panel data models with selection. The method uses backward substitution for the lagged dependent variable, which leads to an estimating equation that requires correcting for contemporaneous selection only. The estimator is valid under relatively weak assumptions about errors and permits avoiding the weak instruments problem associated with differencing. We also propose a simple test for selection bias that is based on the addition of a selection term to the first‐difference equation and subsequent testing for significance of this term. The methods are applied to estimating dynamic earnings equations for women. Copyright © 2011 John Wiley & Sons, Ltd.
Effect of microRNA‐34a in cell cycle, differentiation, and apoptosis: A review
Authors: Chen Fei , Hu Shen‐Jiang 
Published: December 2011

AbstractThe tumor suppressor gene p53 was shown to directly regulate the expression of microRNA‐34a (miR‐34a). miR‐34a regulates a plethora of target proteins, which are involved in cell cycle, apoptosis, differentiation, and cellular development.miR‐34a resides in the region of chromosome 1p36.23, which is commonly deleted in many tumor types, while it results in the loss expression of miR‐34a. The promoters of the miR‐34a gene subject to inactivation by CpG methylation also induce the loss expression of miR‐34a. Ectopic miR‐34a expression induces apoptosis, cell cycle arrest, and differentiation or reduces migration. This review summarizes the progress regarding the role of miR‐34a in cell cycle, differentiation, and apoptosis. © 2011 Wiley Periodicals, Inc. J Biochem Mol Toxicol 26:79–86 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/jbt.20412
Exploring the relevance of feminist pedagogy to community psychology: continuing the dialogue
Authors: St. Germaine‐Small Melissa , Walsh‐Bowers Richard , Mitchell Terry L. 
Published: December 2011

AbstractPsychology has made advances in rectifying its historical negation of women's perspectives, as evidenced by a steady increase in women's scholarship and distinctly feminist works. However, in community psychology, the scope and magnitude of works generated both by and about women from a feminist framework have not kept pace with discourse on the nature of graduate education. The purpose of this article is to stimulate further discussion about the ways in which greater attention to the principles and practices of feminist pedagogy can enhance the interpersonal processes and content of community psychology graduate education. We provide illustrative examples of feminist pedagogy for community psychology from doctoral student and female and male faculty perspectives. We conclude by discussing the challenges to actualizing the potential for social action inherent in feminist pedagogy in relation to its apparent congruency with the principles and practices of community psychology. © 2011 Wiley Periodicals, Inc.
The educational journey of a Latina feminist community psychologist
Authors: Guzman Bianca 
Published: December 2011

AbstractThis narrative describes how my educational journey led me to become a Latina feminist community psychologist. My experiences as a Central American woman living in the United States has made me deeply committed to feminist community values and the importance of social justice. Throughout the journey, I connect how immigration status, culture, and gender are intertwined in my career path. My journey includes discussion of my education from elementary school to a doctoral program. I acknowledge the positive role that mentors have had in my educational success. I also discuss how the voices of people of color and women are not always adequately heard or represented in feminist community psychology (FCP). My intensely personal stories are shared in the spirit of connecting with other women and acknowledging that lived experiences are a way of learning and valid forms of inquiry in the field of FCP. © 2011 Wiley Periodicals, Inc.
Comparison of circumferential resection margin clearance criteria with survival after surgery for cancer of esophagus
Authors: Rao V.S.R. , Yeung M.M.Y. , Cooke J. , Salim E. , Jain P.K. 
Published: December 2011

AbstractBackgroundCircumferential resection margin (CRM) is widely recognized as an important prognostic factor in esophageal cancer. The aim of this study was to evaluate the clinical significance of CRM according to the current criteria of the Royal College of Pathologists (RCP) and the College of American Pathologists (CAP).MethodsPatients (115) who underwent esophagectomy between 2000 and 2006 were included in this retrospective study. Factors such as neo‐adjuvant therapy, site, histological type, size, and lymph node involvement were tested to determine predictability of CRM involvement. Along with these, age, sex, CRM, and adjuvant therapy were analyzed to determine influence on survival.ResultsOn the basis of CRM, patients were divided into three groups (involved, 0.1–1 mm and >1mm). Size (T) was the only factor strongly predictive of CRM involvement (P < 0.001). Size (T; P = 0.04) and lymph node involvement (N; P = 0.0003) were found to significantly influence overall survival (OS). When patients with CRM (involved and 0.1–1mm) were compared with those with CRM > 1 mm, OS was significantly prolonged in the latter (P = 0.02).ConclusionThis study appears to lend credence to the RCP criteria for definition of CRM over the CAP criteria. J. Surg. Oncol. 2012; 105:745–749. © 2011 Wiley Periodicals, Inc.
The number of pathologic lymph nodes involved is still a significant prognostic factor even after neoadjuvant chemoradiotherapy in esophageal squamous cell carcinoma
Authors: Akutsu Yasunori , Shuto Kiyohiko , Kono Tsuguaki , Uesato Masaya , Hoshino Isamu , Shiratori Toru , Isozaki Yuka , Akanuma Naoki , Uno Takashi , Matsubara Hisahiro 
Published: December 2011

AbstractBackgroundThe correlation between the number of pathologic metastatic LNs in patients with esophageal squamous cell carcinoma (ESCC) after neoadjuvant chemoradiotherapy (NACRT) and surgical outcome has rarely been reported. We evaluated the correlation between the number of pathologic metastatic lymph nodes (LNs) and the surgical outcome in ESCC after NACRT.MethodsEighty‐eight patients with ESCC who underwent NACRT followed by surgery were evaluated. The clinical response of NACRT was evaluated and surgical specimens of the primary tumor and resected LNs were analyzed clinicopathologically.ResultsFewer pathologic metastatic LNs was associated with better survival. According to the number of metastatic LNs, the difference in the median survival was the largest between the groups when patients were divided into those with 2 and 3 metastatic LNs (χ2: 13.694, P < 0.001). With regard to clinical factors, the initial N status prior to treatment had the most significant impact on survival by a univariate analysis (P = 0.064), and the number of pathologic metastatic LNs was a risk factor for poor survival, with a hazard ratio of 5.128 (95% C.I.: 1.438–18.285, P = 0.012) by a multivariate analysis.ConclusionsOf the various factors, the number of pathologic metastatic LNs was the strongest indicator to predict the patients' survival. J. Surg. Oncol. 2012; 105:756–760. © 2011 Wiley Periodicals, Inc.
Microvascular cricoid cartilage reconstruction with the thoracodorsal artery scapular tip autogenous transplant
Authors: Chanowski Eric J. P. , Haxer Marc J. , Chepeha Douglas B. 
Published: December 2011

AbstractConservation laryngeal surgery has been limited by difficulties with partial resection of the cricoid. Numerous options have been suggested that include temporoparietal flaps, free cartilage grafts, radial forearm free tissue transfers, and tracheal autotransplantation with vascular carriers. The authors present a one‐stage procedure for the reconstruction of the cricoid cartilage based on the thoracodorsal artery scapular tip (Tdast) autogenous transplant that uses the curved tip of the scapula and does not create a secondary tracheal defect. Because the Tdast is a vascularized graft it may withstand radiation treatment.
Thermotropic Mesomorphism via Self‐Assembly of Cationic Dendritic Polymers with an Anionic Polar Carboxylic Acid
Authors: Hernández‐Ainsa Silvia , Barberá Joaquín , Marcos Mercedes , Romero Pilar , Serrano José Luis 
Published: December 2011

AbstractThe synthesis and characterization of ionic liquid crystalline dendritic polymers based on the ammonium salts of commercially available poly(propylene imine) (PPI), poly(amidoamine) (PAMAM), poly(ethyleneimine) (PEI), and the fully methylated PEI (PEIMe) with 5‐(4‐cyanobiphenoxy)pentanoic acid (CBPA) are reported. The occurrence of proton transfer from the carboxylic acid to the amine groups is confirmed using IR and NMR techniques. The mesomorphic behavior is investigated by means of differential scanning calorimetry, polarizing optical microscopy, and X‐ray diffractometry. Although CBPA exhibits monotropic nematic mesomorphism, all ionic complexes display enantiotropic liquid crystal properties. The relationship between the mesomorphism of the complexes and their structure is discussed.
Occupational risk factors and pancreatic cancer: A review of recent findings
Authors: Andreotti Gabriella , Silverman Debra T. 
Published: December 2011

AbstractSeveral occupational exposures have been linked to excess risk of pancreatic cancer; however, most associations are not well established. The objective of this review article is to report on the more recently published studies (1998–2010), and provide a summary of the most consistently reported occupational risk factors for pancreatic cancer, including exposure to chlorinated hydrocarbon compounds, pesticides, polycyclic aromatic hydrocarbons (PAHs), metals, nitrosamines, radiation, various airborne particles, and employment in sedentary occupations. We conclude that the strongest and most consistent findings linking occupational exposures with pancreatic cancer risk to date are for chlorinated hydrocarbons and PAHs. © 2011 Wiley Periodicals, Inc.
Pancreatic cancer risk: Associations with meat‐derived carcinogen intake in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) cohort
Authors: Anderson Kristin E. , Mongin Steven J. , Sinha Rashmi , Stolzenberg‐Solomon Rachael , Gross Myron D. , Ziegler Regina G. , Mabie Jerome E. , Risch Adam , Kazin Sally S. , Church Timothy R. 
Published: December 2011

AbstractBackgroundEpidemiological studies report positive associations between high‐temperature cooked meat intake and pancreatic cancer. We assessed associations between dietary intake of heterocyclic amines (HCAs) and benzo(a)pyrene (BaP)—mutagens formed in meat cooked at high temperatures—and incident exocrine pancreatic cancer in a prospective cohort.MethodsThe 62 581 subjects randomized to screening in the Prostate, Lung, Colorectal, and Ovarian Screening Trial (PLCO) who completed an initial dietary survey that assessed meat intake, cooking methods, and doneness preferences defined the cohort. Subjects were surveyed annually for incident cancers through 2007. A National Cancer Institute research database (CHARRED) was used to estimate HCA and BaP intake and a Mutagenic Activity Index (MAI) from survey data. Proportional hazard ratios (HRs) for risk of pancreatic cancer were estimated from multi‐variate Cox regression models by quintile of intake, with the lowest quintile as the referent.ResultsDuring follow‐up (median: 10 yr), 248 cases of exocrine pancreatic cancer were confirmed. Preferences for well and very well done meat were generally associated with increased risks. Significant elevations in pancreatic cancer risk were found in upper quintiles of MAI, and individual mutagens 2‐amino‐3,4,8‐trimethylimidazo[4,5‐f]quinoxaline (DiMeIQx) and 2‐amino‐3,8‐dimethylimidazo[4,5‐f]quinoxaline (MeIQx). Compared to the lowest quintile of MAI, the third and fifth quintiles brought HRs of 1.86 (1.22, 2.85) and 1.87 (1.16, 3.02), respectively. These three exposures exhibited significant (P‐trend: 0.01–0.03) positive trends in risk as their levels increasedConclusionConsuming well‐done meat cooked at high temperatures, which contains high mutagen levels, appears to confer increased risk of pancreatic cancer. © 2011 Wiley Periodicals, Inc.
Selected medical conditions and risk of pancreatic cancer
Authors: Olson Sara H. 
Published: December 2011

AbstractWe review the current evidence for associations of several medical conditions with risk of pancreatic cancer, including allergies, pancreatitis, gall bladder disease, cholecystectomy, ulcers, gastrectomy, appendectomy, and tonsillectomy. There are consistent findings of reduced risk associated with presence of self‐reported allergies, particularly hay fever but not asthma; data on other allergies are limited and inconclusive. Several studies provide evidence that patients with pancreatic cancer are more likely than comparison groups to report pancreatitis. Those studies that investigated the time between onset of pancreatitis and diagnosis of pancreatic cancer found that risk estimates declined with longer periods of time; however, increased risks were noted for long‐term pancreatitis, indicating that this condition is both a risk factor and a sign of early disease. Increased risk was reported in association with cholelithiasis, but the few studies that considered time before diagnosis of cancer did not find increased risk for cholelithiasis diagnosed in the more distant past. There is weak evidence that cholecystectomy 2 or more years before cancer diagnosis is related to risk, but this is based on only a few studies. There is no consistent association between ulcers and risk, while gastrectomy may increase risk. Overall, study of these conditions, particularly those that are rare, presents methodologic challenges. Time between diagnoses is likely to be important but is not considered in most studies. Lack of adequate control in several studies for risk factors such as smoking and heavy alcohol use also makes it difficult to draw firm conclusions about these results. © 2011 Wiley Periodicals, Inc.
Direct B0 field monitoring and real‐time B0 field updating in the human breast at 7 tesla
Authors: Boer Vincent O. , vd Bank Bart L. , van Vliet Gerard , Luijten Peter R. , Klomp Dennis W. J. 
Published: December 2011

AbstractLarge dynamic fluctuations of the static magnetic field (B0) are observed in the human body during MR scanning, compromising image quality and detection sensitivity in several MR imaging and spectroscopy sequences. Partially, these dynamic B0 fluctuations are due to physiological motion such as breathing, but other sources of temporal B0 field fluctuations are also present in the MR system (e.g., eddy currents). Especially at ultrahigh field (≥7 T), the increased susceptibility effects lead to large B0 field variations over time. Direct measurement and correction of these temporal field variations of up to 70 Hz will lead to a significant reduction of artifacts and improved measurement stability/reproducibility. For direct measurement of the temporally changing B0 field, a simple field probe was developed, that was placed in proximity to the tissue of interest. In this work, it is shown how such a field probe system can be used to monitor temporal B0 field variations in the human body during MRI and magnetic resonance spectroscopy. Furthermore, it is shown how the acquired temporal B0 field information can drive a dynamic shim module to directly correct the B0 magnetic field in real time. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.
Efficient variational constitutive updates by means of a novel parameterization of the flow rule
Authors: Bleier Nikolaus , Mosler Jörn 
Published: December 2011

SUMMARYAnalogously to the classical return‐mapping algorithm, so‐called variational constitutive updates are numerical methods allowing to compute the unknown state variables such as the plastic strains and the stresses for material models showing an irreversible mechanical response. In sharp contrast to standard approaches in computational inelasticity, the state variables follow naturally and jointly from energy minimization in case of variational constitutive updates. This leads to significant advantages from a numerical, mathematical as well as from a physical point of view. However, while the classical return‐mapping algorithm has been being developed for several decades, and thus, it has already reached a certain maturity, variational constitutive updates have drawn attention only relatively recently. This is particularly manifested in the numerical performance of such algorithms. Within the present paper, the numerical efficiency of variational constitutive updates is critically analyzed. It will be shown that a naive approximation of the flow rule causes a singular Hessian within the respective Newton–Raphson scheme. However, by developing a novel parameterization of the flow rule, an efficient algorithm is derived. Its performance is carefully compared to that of the classical return‐mapping scheme. This comparison clearly shows that the novel variationally consistent implementation is, at least, as efficient as the classical return‐mapping algorithm. Copyright © 2011 John Wiley & Sons, Ltd.
OpenCL‐based implementation of an unstructured edge‐based finite element convection‐diffusion solver on graphics hardware
Authors: Mossaiby F. , Rossi R. , Dadvand P. , Idelsohn S. 
Published: December 2011

SUMMARYThe solution of problems in computational fluid dynamics (CFD) represents a classical field for the application of advanced numerical methods. Many different approaches were developed over the years to address CFD applications. Good examples are finite volumes, finite differences (FD), and finite elements (FE) but also newer approaches such as the lattice‐Boltzmann (LB), smooth particle hydrodynamics or the particle finite element method. FD and LB methods on regular grids are known to be superior in terms of raw computing speed, but using such regular discretization represents an important limitation in dealing with complex geometries. Here, we concentrate on unstructured approaches which are less common in the GPU world. We employ a nonstandard FE approach which leverages an optimized edge‐based data structure allowing a highly parallel implementation. Such technique is applied to the ‘convection‐diffusion’ problem, which is often considered as a first step towards CFD because of similarities to the nonconservative form of the Navier–Stokes equations. In this regard, an existing highly optimized parallel OpenMP solver is ported to graphics hardware based on the OpenCL platform. The optimizations performed are discussed in detail. A number of benchmarks prove that the GPU‐accelerated OpenCL code consistently outperforms the OpenMP version. Copyright © 2011 John Wiley & Sons, Ltd.
Directly resolving particles in an electric field: local charge, force, torque, and applications
Authors: Liu Qianlong 
Published: December 2011

SUMMARYProsperetti's seminal Physalis method for fluid flows with suspended particles is extended to electric fields to directly resolve finite‐sized particles and to investigate accurately the mutual fluid–particle, particle–particle, and particle–boundary interactions. The present paper shows the straightforward extension of the two dimensions [Liu, Q., 2011,J. Comput. Phys.230:8256–8274] to three dimensions as one of the important advantages. The method can be used for uncharged/charged dielectrics, uncharged/charged conductors, conductors with specified voltage, and general weak and strong discontinuous interface conditions. These general interface conditions can be in terms of field variable, its gradients, and surface integration, which has not been addressed by other numerical methods. In addition, for the first time, we rigourously derive the force and torque on the finite‐sized particles resulting from the interactions between harmonics. The method, for the first time, directly resolves the particles with accurate local charge distribution, force, and torque on the particles, making many applications in engineering, mechanics, physics, chemistry, and biology possible, such as heterogeneous materials, microfluidics, electrophotography, electric double‐layer capacitors, and microstructures of nanodispersions. In the present paper, the accuracy of the coefficients in the general analytical solutions is extensively investigated. The method is numerically verified to be accurate even for very strong jump in the weak and strong discontinuous interface conditions, which have not yet been investigated in any other numerical methods. The efficiency of the method is demonstrated with up to 100,000 3D particles, which suggests that the method can be used for many important engineering applications of broad interest. Copyright © 2011 John Wiley & Sons, Ltd.
A numerical test of long‐time stability for rigid body integrators
Authors: Ortolan Giulia , Saccon Alessandro 
Published: December 2011

SUMMARYIn the context of Hamiltonian ODEs, a necessary condition for an integrator to be symplectic or conjugate‐symplectic is that it nearly preserves the exact Hamiltonian. This paper introduces a numerical test of this necessity for rigid body methods. It turns out that several rigid body integrators proposed in literature fail this test. Hence, these integrators should be used with caution for long‐time simulation. Copyright © 2011 John Wiley & Sons, Ltd.