bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel method of utilizing practical optical source with relatively‐narrow spectrum for OCDMA
Authors: Zheng Jilin , Wang Rong , Pu Tao , Lu Lin , Chen Peng , Fang Tao , Chen Xiangfei , Cheng Yun 
Published: August 2009

AbstractA novel method of utilizing optical source with relatively‐narrow spectrum is proposed for coherent temporal‐phase optical code‐division multiple‐access (OCDMA) system based on equivalent phase shift super‐structure fiber Bragg grating (EPS‐SFBG). Simulation and experiment show that better decoding performance will be achieved by making the source's relatively‐narrow spectrum cover half‐side of encoding spectrum. Meanwhile, we can obtain more tolerance of wavelength deviation between the encoder and decoder and less inter‐symbol‐interference (ISI) and corresponding inter‐symbol beat noise (BN) comparing with traditional matching method. The improvements will make low‐cost optical source with relatively‐narrow spectrum fit for OCDMA system and accordingly accelerate the OCDMA's practical application. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2688–2691, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24711
Design of a meta‐screen for near‐zone field focalization at optical frequencies
Authors: Scorrano Luca , Bilotti Filiberto , Vegni Lucio 
Published: August 2009

AbstractIn this letter, we propose the design of a nano‐circuit reactive artificial screen for the synthesis of a given field pattern with sub‐wavelength features at visible frequencies. The meta‐screen consists of a discrete set of dielectric cells, behaving as lumped reactive elements. The cells have been designed according to the recently proposed new concept of metactronics. The spatial distribution of the cells, and the inter‐element electrically small spacing enables the focalization of a sub‐wavelength spot beyond the diffraction limit at a prescribed focal distance. The design is supported by full‐wave simulations, showing the actual focusing properties of the artificial screen proposed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2718–2721, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24719
Transformation optics‐inspired metamaterial coatings for controlling the scattering response of wedge/corner‐type structures
Authors: Gallina Ilaria , Castaldi Giuseppe , Galdi Vincenzo 
Published: August 2009

AbstractTransformation optics has recently emerged as a powerful and systematic approach to design application‐oriented metamaterials. In this letter, following up on our previous studies on thin planar retroreflectors, we show how it is possible, in principle, to design “transformation medium” coatings capable of controlling the scattering response of metallic corner‐ and wedge‐type structures so as, e.g., to strongly enhance the specularly reflected component. We validate our results via a full‐wave study of the near‐ and far‐field responses, and envisage possible applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2709–2712, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24720
Parametric study of guided resonances in octagonal photonic quasicrystals
Authors: Gallina Ilaria , Ricciardi Armando , Pisco Marco , Campopiano Stefania , Castaldi Giuseppe , Cusano Andrea , Cutolo Antonello , Galdi Vincenzo 
Published: August 2009

AbstractIn this article, following up on our previous investigations on guided resonances (GRs) in photonic quasicrystal slabs based on octagonal (quasiperiodic) tilings, we present the salient results from a parametric study of the GR properties, varying the air/dielectric fraction, and the slab refractive index and thickness. Our results, obtained via full‐wave simulations, show similar qualitative trends as those observed in the literature for periodic photonic crystal slabs. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2737–2740, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24721
Bandgap properties of low‐index contrast aperiodically ordered photonic quasicrystals
Authors: Zito Gianluigi , Priya Rose T. , Di Gennaro Emiliano , Andreone Antonello , Santamato Enrico , Abbate Giancarlo 
Published: August 2009

AbstractWe numerically analyze, using Finite Difference Time Domain simulations, the bandgap properties of photonic quasicrystals with a low‐index contrast. We compared 8‐, 10‐, and 12‐fold symmetry aperiodically ordered lattices with different spatial tiling. Our results show that tiling design, more than symmetry, determines the transmission properties of these structures. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2732–2737, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24724
On the dispersion equation for a homogeneous, bi‐isotropic waveguide of arbitrary cross‐section
Authors: Ioannidis A. D. , Kristensson G. , Sjöberg D. 
Published: August 2009

AbstractIn this article, we consider the propagation problem inside a waveguide filled with a homogeneous bi‐isotropic material. The cross section of the waveguide is assumed arbitrary. By using the classical theory for the 2D Helmholtz equation in the cross section and the null‐field approach, we obtain the dispersion equation in an implicit form. The final equation is a potential candidate for the solution of the direct and the inverse propagation problems. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2701–2705, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24726
Behavioral modeling of GaN‐based power amplifiers: Impact of electrothermal feedback on the model accuracy and identification
Authors: Quaglia Roberto , Camarchia Vittorio , Cappelluti Federica , Guerrieri Simona Donati , Lima Eduardo G. , Ghione Giovanni , Pirola Marco 
Published: August 2009

AbstractIn this article, we discuss the accuracy of behavioral models in simulating the intermodulation distortion (IMD) of microwave GaN‐based high‐power amplifiers in the presence of strong electrothermal (ET) feedback. Exploiting an accurate self‐consistent ET model derived from measurements and thermal finite‐element method simulations, we show that behavioral models are able to yield accurate results, provided that the model identification is carried out with signals with wide bandwidth and large dynamics. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2789–2792, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24732
Synthesis and characterization of polymer embedded iron oxide nanocomposites
Authors: Peluso Antonio , Pagliarulo Vito , Carotenuto Gianfranco , Pepe Giovanni P. , Davino Daniele , Visone Ciro , Longo Angelo , Capezzuto Filomena 
Published: August 2009

AbstractOptical plastics filled by nano‐sized magnetic particles may have relevant applications in magneto‐optics. Here, an in‐situ method for the preparation of magnetic nanoparticles embedded in polystyrene by thermal decomposition of iron mercaptide is described. Transparent ferromagnetic and superparamagnetic nanocomposites have been produced using iron (II) and iron (III) mercaptides. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2774–2777, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24733
Microwave operation of sub‐micrometer gate surface channel MESFETs in polycrystalline diamond
Authors: Calvani P. , Corsaro A. , Sinisi F. , Rossi M. C. , Conte G. , Giovine E. , Ciccognani W. , Limiti E. 
Published: August 2009

AbstractSubmicron gate‐length metal semiconductor field effect transistors (MESFETs) were fabricated on hydrogen‐terminated—large grain polycrystalline diamond. Devices showed high drain‐source current (140 ma/mm) and large transconductance values (50 ms/mm), with a cut‐off frequency ft = 10 GHz and a maximum oscillation frequency, fmax, up to 35 GHz. These values are obtained through the fabrication of devices with geometry and active region dimensions (200–500 nm gate length) compatible with available microelectronic technologies. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2786–2788, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24738
An empirical method to identify patterns in the course of psychotic episodes of people with schizophrenia
Authors: Burti Lorenzo , Mazzi Mariangela , Koeter Maarten , Schene Aart , Helm Hedda , Puschner Bernd , Bindman Jonathan , Leese Morven , Thornicroft Graham , Tansella Michele 
Published: August 2009

AbstractObjective: This paper illustrates the process of constructing, selecting and applying simple measures in order to empirically derive patterns of course of psychotic episodes in schizophrenia.Method: Data were collected with a composite instrument constructed for a multi‐centre, follow‐up randomized controlled trial of adherence therapy for people with schizophrenia. The instrument included a retrospective weekly assessment of psychotic/non‐psychotic status, which was used to derive the measures, and the DSM‐IV course specifiers.Results: The measures discriminated well between different course patterns and identified homogeneous clusters of subjects which correlated with the groups derived from the DSM‐IV course specifiers.Conclusions: The new measures provide an empirical basis to identify specific patterns of course and to differentiate patients according to pre‐defined criteria. They can be used in follow‐up studies as measures of outcome, to investigate correlations between variables and to identify potential predictors of outcome. Copyright © 2009 John Wiley & Sons, Ltd.
Linearly many faults in 2‐tree‐generated networks
Authors: Cheng Eddie , Lipták László , Sala Fred 
Published: August 2009

AbstractIn this article we consider a class of Cayley graphs that are generated by certain 3‐cycles on the alternating group An. These graphs are generalizations of the alternating group graph AGn. We look at the case when the 3‐cycles form a “tree‐like structure,” and analyze its fault resiliency. We present a number of structural theorems and prove that even with linearly many vertices deleted, the remaining graph has a large connected component containing almost all vertices. © 2009 Wiley Periodicals, Inc. NETWORKS, 2010
A robust branch‐cut‐and‐price algorithm for the heterogeneous fleet vehicle routing problem
Authors: Pessoa Artur , Uchoa Eduardo , Poggi de Aragão Marcus 
Published: August 2009

AbstractThis article presents a robust branch‐cut‐and‐price algorithm for the heterogeneous fleet vehicle routing problem (HFVRP), vehicles may have distinct capacities and costs. The columns in the formulation are associated to q‐routes, a relaxation of capacitated elementary routes that makes the pricing problem solvable in pseudopolynomial time. Powerful new families of cuts are also proposed, which are expressed over a very large set of variables. Those cuts do not increase the complexity of the pricing subproblem. Experiments are reported where instances with up to 75 vertices were solved to optimality, a major improvement with respect to previous algorithms. © 2009 Wiley Periodicals, Inc. NETWORKS, 2009
Neighborhood conditions for graphs to be super restricted edge connected
Authors: Wang Shiying , Li Jing , Wu Lihong , Lin Shangwei 
Published: August 2009

AbstractRestricted edge connectivity is a more refined network reliability index than edge connectivity. For a connected graph G = (V, E), an edge set S ⊆ E is a restricted edge cut if G − S is disconnected and every component of G − S has at least two vertices. The restricted edge connectivity of G is defined as the cardinality of a minimum restricted edge cut. G is super restricted edge connected if every minimum restricted edge cut of G isolates one edge. In this article, we present several neighborhood conditions for a graph to be super restricted edge connected. © 2009 Wiley Periodicals, Inc. NETWORKS, 2010
Wavelength assignment in multifiber star networks
Authors: Bian Zhengbing , Gu Qian‐Ping 
Published: August 2009

AbstractWe consider the wavelength assignment problem in WDM optical networks with multiple parallel fibers: Given a setPof paths, assign a color to each path such that the number of paths with the same color containing any link is at most the number of fibers in the link. Assuming the number of fibers in each link is fixed, we study two optimization problems. One is to minimize the number of colors for coloringP. The other is to color as many paths ofPas possible with a given number of colors. We show that both the minimization and the maximization problems are NP‐hard in star networks with a uniform odd number of fibers. We give polynomial time optimal algorithms for the minimization and maximization problems in star networks with an even number of fibers and in the generalized star networks with a uniform even number of fibers. We also give a 1.58‐approximation algorithm for the maximization problem in the generalized star networks with an arbitrary number of fibers. The algorithms for the maximization problem in the generalized stars are based on our newly developed algorithm, which optimally solves the call control problem in the generalized star networks. The call control algorithm is of independent interest. © 2009 Wiley Periodicals, Inc. NETWORKS, 2010
Synthesis and fluorescence properties of dysprosium‐coordinated with high‐Tg polyaryletherketones containing carboxyl side groups
Authors: Liu Dan , Yu Hao , Wang Zhonggang , Xin Lei , You Jia , Li Guiyang 
Published: August 2009

AbstractA series of novel dysprosium coordination polymers were synthesized using new high‐Tg carboxyl‐containing polyaryletherketones (PEKs) as macromolecular ligands and a small molecule, 1,10‐phenanthroline, as co‐ligand. The FTIR, WAXD, and UV–Vis results indicated that the dysprosium ions were coordinated simultaneously with carboxyl group of PEKs and 1,10‐phenanthroline, and homogeneously distributed along the polymer backbone. These obtained dysprosium coordination polymers showed excellent film‐formation properties. Moreover, all the dysprosium coordination polymers could exhibit the intense characteristic emission of dysprosium ions under UV excitation. Meanwhile, the emission intensity increased with increasing dysprosium ion content, and no obvious fluorescence quenching happened at the Dy3+ ion content up to 10.71 wt%, which was attributed to the very rigid structure of PEK and synergistic coordination effect of PEK and 1,10‐phenanthroline. Copyright © 2009 John Wiley & Sons, Ltd.
Recent progress in understanding the pathology of malignant melanoma
Authors: Kuphal Silke , Bosserhoff Anja 
Published: August 2009

AbstractRecently, several important findings on melanoma development and progression have accelerated progress towards a molecular understanding of melanoma biology. Furthermore, the development of experimental tools, such as a wide range of cell lines and animal models of metastasis, has turned melanoma into a model for general tumour research. However, it has also become evident that melanoma is distinct from other tumours with regard to its cellular origin and pathophysiological mechanisms. This review focuses on important new findings that have contributed to a greater understanding of the molecular processes leading to melanoma. Translating these innovative new results into potent therapeutic approaches will require even more effort. Copyright © 2009 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Chain reaction of amyloid fibril formation with induction of basement membrane in familial amyloidotic polyneuropathy
Authors: Misumi Yohei , Ando Yukio , Ueda Mitsuharu , Obayashi Konen , Jono Hirofumi , Su Yu , Yamashita Taro , Uchino Makoto 
Published: August 2009

AbstractFamilial amyloidotic polyneuropathy (FAP) is characterized by extracellular deposition of amyloid fibrils caused by a point mutation in the transthyretin (TTR) gene. Despite data from a number of in vitro studies of TTR amyloidogenesis, many questions, including where and how these fibrils form in vivo and what is the impact of amyloid deposition on tissues, remain unanswered. Here, we analysed the relationship between amyloid fibril formation and micro‐environmental changes by using autopsy cardiac tissues from 11 patients with FAP and a smooth muscle cell line. Ultrastructural studies of cardiomyocytes and vascular smooth muscle cells showed that amyloid fibrils formed first at the basement membrane and that amorphous non‐fibrillar TTR deposits and premature fibrils predominated during the early stage of amyloid deposition. Immunohistochemical analyses revealed that expression of major components of the basement membrane, such as collagen IV, laminin, and fibronectin, increased in parallel with the accumulation of TTR amyloid fibrils. In vitro studies with a vascular smooth muscle cell line revealed that synthetic TTR aggregates increased expression of these basement membrane components. Serum levels of collagen IV in FAP patients were significantly higher than those in healthy controls. Our data thus indicate that TTR amyloid fibrils formed first at the basement membrane and that expression of basement membrane components that was induced by amyloid deposition contributed to further amyloid deposition. This chain reaction may have important implications for FAP pathogenesis. Copyright © 2009 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Towards a unified view of the solvatochromism of phenolate betaine dyes
Authors: Domínguez Moisés , Rezende Marcos Caroli 
Published: August 2009

AbstractAn attempt has been made in order to unify the three types of solvatochromisms (negative, positive and inverted) of phenolate betaine dyes by a working model which describes them as particular cases of a general behavior. The model, based on the calculation (gas phase) of the chemical hardness of donor and acceptor fragments, was applied to 56 examples from the literature. As a result, the investigated compounds were grouped according to the sum of the hardnesses of their (non‐interacting) fragments, this sum being larger for a negative, intermediate for an inverted, and smaller for a positive solvatochromic behavior. Copyright © 2009 John Wiley & Sons, Ltd.
A partial nudged elastic band implementation for use with large or explicitly solvated systems
Authors: Bergonzo Christina , Campbell Arthur J. , Walker Ross C. , Simmerling Carlos 
Published: August 2009

AbstractThe nudged elastic band method (NEB) can be used to find a minimum energy path between two given starting structures. This method has been available in the standard release of the Amber9 and Amber10 suite of programs. In this article, a novel implementation of this method will be discussed, in which the nudged elastic band method is applied to only a specific, user‐defined subset of atoms in a particular system, returning comparable results, and minimum energy pathways as the standard implementation for an alanine dipeptide test system. This allows incorporation of explicit solvent with simulated systems, which may be preferred in many cases to an implicit solvent model. From a computational standpoint, this implementation of NEB also reduces the communication overhead inside the code, resulting in better performance for larger systems. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2009
Evaluation of uncertainties in X‐ray photoelectron spectroscopy intensities associated with different methods and procedures for background subtraction. II. Spectra for unmonochromated Al and Mg X‐rays
Authors: Powell C. J. , Conny J. M. 
Published: August 2009

AbstractWe report uncertainties in X‐ray photoelectron spectroscopy (XPS) intensities arising from commonly used methods and procedures for subtraction of the spectral background. These uncertainties were determined from a comparison of XPS intensities reported by volunteer analysts and the corresponding intensities expected for a set of simulated XPS spectra. We analyzed peak intensities from 16 sets of data (submitted from 15 institutions) for a group of 12 spectra that had been simulated for an unmonochromated Al‐Kα source and similar intensities from 20 sets of data (submitted from 17 institutions) that had been simulated for an unmonochromated Mg‐Kα source. Each reported intensity was compared with an expected intensity for the particular integration limits chosen by each analyst and known from the simulation design. We present ratios of the reported intensities to the expected intensities for the background‐subtraction methods chosen by the analysts. These ratios were close to unity in most cases, as expected, but deviations were found in the results from some analysts, particularly if shakeup was present. We showed that better results for the Shirley and Tougaard backgrounds were obtained when analysts determined peak intensities over certain energy ranges or integration limits. We then were able to suggest integration limits that should be a useful guide in the determination of peak intensities for other XPS spectra. The use of relatively narrow integration limits with the Shirley and linear backgrounds, however, will lead to measures of peak intensity that are less than the total intensities. Although these measures may be satisfactory for some quantitative analyses, errors in quantitative XPS analyses can occur if there are changes in XPS lineshapes or shakeup fractions with change of chemical state. The use of curve‐fitting equations to fit an entire spectrum will generally exclude the shakeup contribution to the intensity of the main peak, and any variation in the shakeup fraction with change of chemical state will not be taken into account. Published in 2009 by John Wiley & Sons, Ltd.
Family ownership and acquisition behavior in publicly‐traded companies
Authors: Miller Danny , Le Breton‐Miller Isabelle , Lester Richard H. 
Published: August 2009

AbstractMuch of the literature on corporate acquisitions has focused on managerial incentives for making acquisitions but has underemphasized the role played by the social context of major shareholders. This study of Fortune 1000 firms argues that the priorities and risk preferences of family owners can have important implications not only for the volume but also for the diversifying nature of their acquisitions. Agency and family business perspectives are used to derive expectations concerning the acquisitions behavior of family owners. Consistent with both perspectives, and owners' desire to reduce business risk, we find that family ownership is inversely related to the number and dollar volume of acquisitions. However, whereas agency theorists differ about how ownership concentration influences whether acquisitions are diversified, the family firm literature is more definitive. The latter suggests that given family owners' desire to retain control of their firms for offspring, their wealth must remain concentrated. Hence they can most easily reduce the risk of their wealth portfolio by diversifying the business—that is, through diversifying acquisitions. Consistent with this logic, we found the propensity to make diversifying acquisitions to increase with the level of family ownership. Copyright © 2009 John Wiley & Sons, Ltd.