bluuebunny/crossref_metadata_2025_split huggingface dataset:
Diagnostic utility of array‐based comparative genomic hybridization (aCGH) in a prenatal setting
Authors: Maya Idit , Davidov Bella , Gershovitz Liron , Zalzstein Yael , Taub Ellen , Coppinger Justine , Shaffer Lisa G. , Shohat Mordechai 
Published: October 2010

AbstractObjectiveArray‐based comparative genomic hybridization (aCGH) is a new technique for detecting submicroscopic deletions and duplications. There is limited information regarding its use in the prenatal setting. Here, we present our experience of 269 prenatal aCGHs between 2006 and 2009.MethodThe indications for testing were fetal anomalies on ultrasound (U/S), advanced maternal age (AMA), family history of a disorder of unknown etiology, parental concern, abnormal routine karyotype and abnormal serum biochemical screening for common fetal aneuploidies.ResultsOf 15 cases with a known abnormal karyotype, 11 had a normal aCGH. This enabled us to reassure the families and the pregnancies were continued. The remaining four showed an abnormal aCGH, confirming the chromosomes were unbalanced, and were terminated. Of 254 cases with a normal karyotype, 3 had an abnormal aCGH and were terminated. Overall, new clinically relevant results were detected by aCGH in 18 cases, providing additional information for prenatal genetic counseling and risk assessment.ConclusionOur results suggest that prenatal aCGH should be offered particularly in cases with abnormal U/S. We found the rate of detecting an abnormality by aCGH in low‐risk pregnancies was 1:84, but larger studies will be needed to expand our knowledge and validate our conclusions. Copyright © 2010 John Wiley & Sons, Ltd.
Dense array connections for photovoltaic systems in concentration
Authors: Salemi A. , Eccher M. , Miotello A. , Brusa R. S. 
Published: October 2010

AbstractTwo new types of connections for photovoltaic cells in dense array are presented. These connections, making use of dc–dc converter modules, are shown to increase the power transfer to the load with respect to array realized with series o parallel connections for the same number of cells. The present connections are of particular interest in concentration photovoltaic (CPV) systems where the intensity of the incident light on each cell of the array can be very different causing the cells of the same array working with different current–voltage (I–V) curves. The two types of connection and the classical series and parallel connections are compared on a theoretical basis. Applications of the connections in real working scenarios are illustrated and discussed. Copyright © 2010 John Wiley & Sons, Ltd.
Reflection of normally incident light from silicon solar cells with pyramidal texture
Authors: Baker‐Finch Simeon C. , McIntosh Keith R. 
Published: October 2010

AbstractA surface texture enhances the capacity of a solar cell to absorb incident radiation. In high efficiency and industry standard designs alike, pyramidal surface textures play the key role of reducing the reflectance of the cell surface. This reduction is achieved by ensuring that incident light rays suffer at least a double reflection in the various facets of the structure. In this work, we define a general expression for the reflectance of a pyramidal texture by identifying discrete paths of reflection and the fraction of reflected light that follows each of these paths. We apply the expression to analyse the reflection of normally incident light at textured surfaces. We examine three common morphologies, finding that a regular array of inverted pyramids just outperforms a random array of upright pyramids, with a regular array of upright pyramids showing poorer capacity to reduce front surface reflection. We extend the analysis to determine the transmittance of the various structures, thus permitting the calculation of a figure of merit that can be used to optimise the thickness of antireflection coatings (ARCs). Finally, by examining the angles at which light is reflected by the pyramidal textures, we find that an encapsulant of refractive index greater than 1.59 gives between 79 and 92% of the initially reflected light a second chance to enter the solar cell. Copyright © 2010 John Wiley & Sons, Ltd.
Psychological distress in women at risk for hereditary breast cancer: the role of family communication and perceived social support
Authors: den Heijer Mariska , Seynaeve Caroline , Vanheusden Kathleen , Duivenvoorden Hugo J. , Bartels Carina C. M. , Menke‐Pluymers Marian B. E. , Tibben Aad 
Published: October 2010

AbstractBackground: Hereditary breast cancer has a profound impact on individual family members and on their mutual communication and interactions. The way at‐risk women cope with the threat of hereditary breast cancer may depend on the quality of family communication about hereditary breast cancer and on the perceived social support from family and friends.Objective: To examine the associations of family communication and social support with long‐term psychological distress in a group of women at risk for hereditary breast cancer, who opted either for regular breast surveillance or prophylactic surgery.Methods: The study cohort consisted of 222 women at risk for hereditary breast cancer, who previously participated in a study on the psychological consequences of either regular breast cancer surveillance or prophylactic surgery. General and breast cancer specific distress, hereditary cancer‐related family communication, perceived social support, and demographics were assessed.Results: Using structural equation modelling, we found that open communication about hereditary cancer within the family was associated with less general and breast cancer specific distress. In addition, perceived support from family and friends was indirectly associated with less general and breast cancer‐specific distress through open communication within the family.Discussion: These findings indicate that family communication and perceived social support from friends and family are of paramount importance in the long‐term adaptation to being at risk for hereditary breast cancer. Attention for these issues needs to be incorporated in the care of women at risk for hereditary breast cancer. Copyright © 2010 John Wiley & Sons, Ltd.
Distress screening, rater agreement, and services in pediatric oncology
Authors: Patel Sunita K. , Mullins Wendy , Turk Anne , Dekel Noya , Kinjo Christine , Sato Judith K. 
Published: October 2010

AbstractObjective: Empirically based data support the validity of the distress thermometer recommended by the National Comprehensive Cancer Network as a standard screen for patient distress. However, the feasibility and utility of the distress thermometer has not been studied in the pediatric oncology setting. We conducted a study to: (1) investigate the validity of an adapted distress thermometer with pediatric oncology patients, (2) assess the degree of agreement among different respondents, including physician and psychosocial staff, with respect to (a) the pediatric cancer patient's distress and (b) the caregiver/parent's distress, and (3) to evaluate the relationship between distress levels and the psychosocial services provided to patients and families.Methods: Ninety‐one patients and their English and Spanish‐speaking caregivers were prospectively assessed at 3‐month intervals for 1 year. The quantity of psychosocial services provided to each family was logged for a 12‐month period.Results: Convergent validity was demonstrated by reasonable agreement between the pediatric distress rating tool and standardized measures. Additionally, the demographic and medical predictors of distress were consistent with previously reported findings using more extensive assessment. There was reasonable agreement among multiple raters of the child's distress; however, there was discrepancy between self‐ratings of caregiver distress and psychosocial staff ratings of caregiver distress. This difference in perception impacted the quantity of psychosocial services provided following the baseline assessment.Conclusion: The single‐item distress thermometer is a viable option as a rapid screening tool of patient and caregiver distress to help efficiently identify those who should be evaluated further. Copyright © 2010 John Wiley & Sons, Ltd.
Computational study on the characteristics of the interaction in linear urea clusters
Authors: Esrafili Mehdi D. , Beheshtian Javad , Hadipour Nasser L. 
Published: October 2010

AbstractQuantum mechanics calculations were applied to investigate the NH···O hydrogen bonding properties in linear (urea)n=1–10clusters. We investigated geometries, binding energies, and17O chemical shielding tensors of urea clusters, by means of MP2 and DFT methods. The charge‐transfer character of the urea clusters was estimated using Natural Bonding Orbital characteristics. It was found that the cooperativity effects enhance significantly the NH···O hydrogen bond from −33.08 (dimer) to −47.67 kJ/mol (decamer). Then‐dependent trend of17O shielding tensors was reasonably correlated with cooperative effects inrCObond distance. To deepen the nature of the interaction in urea clusters, the scheme of decomposition of the interaction energies was applied using Morokuma analysis and a variant of symmetry‐adapted perturbation theory (SAPT) based on DFT description of monomers, referred to as SAPT‐DFT. The SAPT‐DFT analysis of the interaction energy components indicates that the electrostatic and dispersive interactions are the most important attractive terms in the urea dimer. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011
Reinvestigation of intramolecular hydrogen bond in malonaldehyde derivatives: An ab initio, AIM and NBO study
Authors: Nowroozi A. , Raissi H. , Hajiabadi H. , Jahani P. Mohammadzadeh 
Published: October 2010

AbstractThe RAHB systems in malonaldehyde and its derivatives at MP2/ 6‐311++G(d,p) level of theory were studied and their intramolecular hydrogen bond energies by using the related rotamers method was obtained. The topological properties of electron density distribution in OH···O intramolecular hydrogen bond have been analyzed in term of quantum theory of atoms in molecules (QTAIM). Correlations between the H‐bond strength and topological parameters are probed. The results of QTAIM clearly showed that the linear correlation between the electron density distribution at HB critical point and RAHB ring critical point with the corresponding hydrogen bond energies was obtained. Moreover, it was found a linear correlation between the electronic potential energy density,V(rcp), and hydrogen bond energy which can be used as a simple equation for evaluation of HB energy in complex RAHB systems. Finally, the similar linear treatment between the geometrical parameters, such as O···O or OH distance, and Lp(O)→σ*OHcharge transfer energy with the intramolecular hydrogen bond energy is observed. © 2010 Wiley Periodicals, Inc., Int J Quantum Chem, 2011
Isotopic dipole moments in water clusters
Authors: Mohallem Josée R. , Diniz Leonardo G. 
Published: October 2010

AbstractDeuteration can break the symmetry of water clusters either by replacing a H atom with a D atom in monomers or by replacing H2O monomers with D2O ones in a cluster, or by both. These procedures generates isotopic dipole moments in cases the regular ones are forbidden by point‐group symmetry (tetramer, cyclic hexamer, octamer) or vanish because of dynamic symmetry (trimer, pentamer). We report, for the first time, calculations of these dipole moments in small water clusters. Though having small magnitudes, they result large enough to be observable and can be made progressively large with crescent cluster size, for specific isotopic configurations. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2010
Analytical solutions for Yukawa potential applied to atomic systems embedded in debye plasmas
Authors: Santos Leandro C. , Martins M. Graças R. , Vianna J. David M. 
Published: October 2010

AbstractA model to study atomic systems immersed in Debye plasmas is presented. Our model proposes a many‐electron wave function built from analytical solutions for Yukawa potential. The variational principle is used considering the energy as a function of two new parameters: an average charge σ and the difference λ between the nuclear and a dual charge. As an application we have calculated ground state energies for He‐like series for various Debye parameter q. Critical values q* are determined for which the bound‐unbound transitions occur and comparison with other results in the literature are made. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2010
Interplay of intramolecular hydrogen bonds, OH orientations, and symmetry factors in the stabilization of polyhydroxybenzenes
Authors: Mammino Liliana , Kabanda Mwadham M. 
Published: October 2010

AbstractPolyhydroxybenzenes are the parent compounds of large classes of derivatives, many of which exhibit biological activities. The study of derivatives highlights the importance of the conformation stabilizing factors of the parent compounds. To identify these factors, a systematic comparative study of polyhydroxybenzenes was carried out through a computational study of all possible structures and conformers in vacuo and in three solvents differing by their polarities and by the types of interactions with the solute molecule (water, chloroform, and acetonitrile); the results in solution are complemented by the study of adducts with explicit water molecules and, for the simpler structures, also with explicit acetonitrile molecules. The greatest conformation stabilizing effect pertains to intramolecular hydrogen bonds, with preference for consecutive H‐bonds. Uniform orientation of the phenol OH is a stabilizing factor for structures with meta OH groups. Preference for structures with meta OH and with greater symmetry increases as the medium polarity increases. The coexistence of intramolecular H‐bonds and solute–solvent intermolecular H‐bonds in water and acetonitrile solution narrows the solvent‐effect difference between conformers with and without intramolecular H‐bonds. Comparison of results from different calculation methods (HF, MP2, and DFT/B3LYP, with 6‐31G(d,p) and 6‐31++G(d,p) basis sets) shows consistency of the identified trends. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011
Fast generation of broken‐symmetry states in a large system including multiple iron–sulfur assemblies: Investigation of QM/MM energies, clusters charges, and spin populations
Authors: Greco Claudio , Fantucci Piercarlo , Ryde Ulf , Gioia Luca de 
Published: October 2010

AbstractA density functional theory study is presented regarding the energetics and the Mulliken population analyses of a quantum mechanical/molecular mechanical (QM/MM) system including multiple iron–sulfur clusters in the QM region. The [FeFe]‐hydrogenase from Desulfovibrio desulfuricans was studied, and both the active site (an Fe6S6 assembly generally referred to as the H‐cluster) and an ancillary Fe4S4 site were treated at the BP86‐RI/TZVP level. The antiferromagnetic coupling that characterizes both sites was modeled using the broken‐symmetry (BS) approach. For such a QM system, 36 different BS couplings can be defined, depending on the localization of spin excess on the various spin centers. All the BS states were obtained by means of an effective and simple method for spin localization, that is here described and compared with more sophisticated approaches already available in literature. The variation of the QM/MM energy among the various geometry‐optimized protein models was found to be less than 25 kJ mol–1. This energy variation almost doubles if no geometry optimization is performed. A detailed analysis of the additive nature of these variations in QM/MM energy is reported. The Mulliken charges show very small variations among the 36 BS states, whereas the Mulliken spin populations were found to be somewhat more variable. The relevance of such variations is discussed in light of the available Mössbauer and Electron Paramagnetic Resonance (EPR) spectroscopic data for the enzyme. Finally, the influence of the basis set on the spin populations, charges, and structural parameters of the models was investigated, by means of QM/MM computations on the same system at the BP86‐RI/SVP level. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011
Parameter estimation and stabilization for a wave equation with boundary output harmonic disturbance and non‐collocated control
Authors: Guo Wei , Guo Bao‐Zhu , Shao Zhi‐Chao 
Published: October 2010

AbstractThis paper is concerned with the parameter estimation and stabilization of a one‐dimensional wave equation with harmonic disturbance suffered by boundary observation at one end and the non‐collocated control at the other end. An adaptive observer is designed in terms of measured velocity corrupted by harmonic disturbance with unknown magnitude. The backstepping method for infinite‐dimensional system is adopted in the design of the feedback law. It is shown that the resulting closed‐loop system is asymptotically stable. Meanwhile, the estimated parameter is shown to be convergent to the unknown parameter as time goes to infinity. Copyright © 2010 John Wiley & Sons, Ltd.
Convergence to equilibrium of biased plane Partitions
Authors: Caputo Pietro , Martinelli Fabio , Toninelli Fabio Lucio 
Published: October 2010

AbstractWe study a single‐flip dynamics for the monotone surface in (2 + 1) dimensions obtained from a boxed plane partition. The surface is analyzed as a system of non‐intersecting simple paths. When the flips have a non‐zero bias we prove that there is a positive spectral gap uniformly in the boundary conditions and in the size of the system. Under the same assumptions, for a system of sizeM, the mixing time is shown to be of orderMup to logarithmic corrections. © 2010 Wiley Periodicals, Inc. Random Struct. Alg., 39, 83–114, 2011
Duality in inhomogeneous random graphs, and the cut metric
Authors: Janson Svante , Riordan Oliver 
Published: October 2010

AbstractThe classical random graph model G(n, c/n) satisfies a “duality principle”, in that removing the giant component from a supercritical instance of the model leaves (essentially) a subcritical instance. Such principles have been proved for various models; they are useful since it is often much easier to study the subcritical model than to directly study small components in the supercritical model. Here we prove a duality principle of this type for a very general class of random graphs with independence between the edges, defined by convergence of the matrices of edge probabilities in the cut metric. © 2010 Wiley Periodicals, Inc. Random Struct. Alg., 39, 399–411, 2011
Spotting the difference
Authors: Lanna Marconi , Amyot Daniel 
Published: October 2010

AbstractSource Code Management (SCM) is a valuable tool in software development projects, providing the ability to store and retrieve past versions of source files. Comparison tools offer the capability to compare different files or versions, highlighting their differences. Most such tools are built around a two‐pane interface, with files displayed side by side. Such interfaces are inefficient in the use of horizontal screen space, and ineffective since duplication makes text more difficult to read, leaving most of the comparison burden to the user. In this article we introduce an innovative metaphor for comparison interfaces. Based on a single‐pane interface, common text is displayed only once with differences intelligently combined into a single text, improving readability. To further improve usability, additional features were developed: difference classification (additions, deletions, and modifications); fine level of granularity; special features to display modifications; and intelligent white space handling. A usability study conducted among 16 participants using real‐world samples demonstrated the interface adequacy: on average, participants were 60% faster in performing comparison tasks, while the quality of answers improved by almost 80% on our scale. After the experiment, the proposed interface was declared the favorite choice by all participants. Copyright © 2010 John Wiley & Sons, Ltd.
Selected mapping with symbol re‐mapping for OFDM/TDM using MMSE‐FDE
Authors: Gacanin Haris , Adachi Fumiyuki 
Published: October 2010

ABSTRACTOrthogonal frequency division multiplexing (OFDM) signals have a problem with a high peak‐to‐average power ratio (PAPR). A distortionless selected mapping (SLM) has been proposed to reduce the PAPR, but a high computational complexity prohibits its application to an OFDM system with a large number of subcarriers. Recently, we proposed OFDM combined with time division multiplexing (OFDM/TDM) using minimum mean square error frequency‐domain equalization (MMSE‐FDE) to improve the bit error rate (BER) performance of conventional OFDM with a lower PAPR. The PAPR problem, however, cannot be completely eliminated. In this paper, we present an SLM combined with symbol re‐mapping for OFDM/TDM using MMSE‐FDE. Unlike the conventional OFDM, where SLM is applied over subcarriers in the frequency domain, we exploit both time and frequency dimensions of OFDM/TDM signal to improve the performance with respect to PAPR and BER. A mathematical model for PAPR distribution of OFDM/TDM with SLM is presented to complement the computer simulation results. It is shown that proposed SLM can further reduce the PAPR without sacrificing the BER performance with the same or reduced computational complexity. Copyright © 2010 John Wiley & Sons, Ltd.
Interference minimum network topologies for ad hoc networks
Authors: Feng Guinian , Fan Pingyi , Liew Soung Chang 
Published: October 2010

AbstractThis paper investigates the topology control problem with the goal of minimizing mutual interferences in wireless ad hoc networks. It is known that interference is considered as a relationship between link and node in previous works. In this paper, we attempt to capture the physical situation of space‐division multiplex more realistically by defining interference as a relationship between any two bidirectional links. We formulate the pair‐wise interference condition between any two bidirectional links, and demonstrate that the interference condition is equivalent by employing the equal‐power allocation strategy and by employing the minimum‐power allocation strategy. Then we further study the typical interference relationship between a link and its surrounding links. To characterize the extent of the interference between a link and its surrounding links, a new metric, the interference coefficient, is given, and its property is explored in detail by means of analysis and simulation. Based on the insight obtained, a centralized algorithm, BIMA, and a distributed algorithm, LIMA, are proposed to control the network interference. Our simulation indicates that BIMA can minimize the network interference while conserving energy and maintaining good spanner property, and LIMA has relatively good interference performance while keeping low node degree, compared with some well‐known algorithms. Besides, both BIMA and LIMA show good robustness to additive noises in terms of interference performance. Copyright © 2010 John Wiley & Sons, Ltd.