bluuebunny/crossref_metadata_2025_split huggingface dataset:
The quantum theory of atoms in positronic molecules: The subsystem variational procedure
Authors: Heidar Zadeh Farnaz , Shahbazian Shant 
Published: October 2010

AbstractThis contribution deals with the subsystem variational procedure within the context of the quantum theory of atoms in positronic molecules (QTAIPM). Before introducing the subsystem energy functional termed as joint subsystem energy functional, a novel notation and the combination strategy are disclosed in detail by restating the positronic subsystem hypervirial theorem. They are employed in proposing the proper subsystem energy functional, the validity of which is checked by various criteria. The zero flux surfaces of the joint density distribution are used to define the topological atoms in the positronic molecules, and they are incorporated into the subsystem variational procedure as proper real space boundary conditions. The variational procedure finally yields the flux of the joint current property density that also appears in the positronic subsystem hypervirial theorem. At every stage, the corresponding equations for the purely electronic systems within the context of the quantum theory of atoms in molecules (QTAIM) are presented to clearly reveal the analogy between these two formalisms and to emphasize the importance of combining the property density distributions in the QTAIPM. The presented material demonstrates the internal consistency of the whole framework and discloses the fact that the QTAIM must be regarded as a variant of the QTAIPM. Furthermore, this formalism promises an extended QTAIM, which is hoped to resolve the issue of molecular structure beyond the clamp nuclei approximation. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011
Analytical and numerical Lyapunov functions for SISO linear control systems with first‐order reset elements
Authors: Zaccarian Luca , Nešić Dragan , Teel Andrew R. 
Published: October 2010

AbstractIn this paper we provide analytical and numerical Lyapunov functions that prove stability and performance of a First‐order Reset Element (FORE) in feedback interconnection with a SISO linear plant. The Lyapunov functions also allow to establish finite gainℒ︁2stability from a disturbance input acting at the input of the plant to the plant output. ℒ︁2stability is established by giving a bound on the corresponding ℒ︁2gains. The proof of stability and performance is carried out by showing that the Lyapunov functions constructed here satisfy the sufficient conditions in the main results of Nešićet al.(Automatica2008;44(8):2019–2026). In the paper we also point out and illustrate via a counterexample an analysis subtlety overlooked in the preliminary results of Zaccarianet al.(American Control Conference, Portland, OR, U.S.A., 2005). Copyright © 2010 John Wiley & Sons, Ltd.
Coordination of discrete‐time multi‐agent systems via relative output feedback
Authors: You Keyou , Xie Lihua 
Published: October 2010

AbstractThis paper investigates the joint effects of agent dynamic and network topology on the consensusability of linear discrete‐time multi‐agent systems via relative output feedback. An observer‐based distributed control protocol is proposed. A necessary and sufficient condition for consensusability under this control protocol is given, which explicitly reveals how the intrinsic entropy rate of the agent dynamic and theeigenratioof theundirectedcommunication graph affect consensusability. As a special case, multi‐agent systems with discrete‐time double integrator dynamics are discussed where a simple control protocol directly using two‐step relative position feedback is provided to reach a consensus. Finally, the result is extended to solve the formation and formation‐based tracking problems. The theoretical results are illustrated by simulations. Copyright © 2010 John Wiley & Sons, Ltd.
Integrated/hybrid satellite and terrestrial networks for satellite IMT‐Advanced services
Authors: Ahn Do Seob , Kim Hee Wook , Ahn Jaekyoung , Park Dong‐Chul 
Published: October 2010

AbstractThis paper addresses key features of the satellite component of IMT‐Advanced systems, including candidate system architectures, service scenarios, and candidate radio interfaces. We consider integrated/hybrid satellite and terrestrial networks as an efficient means to meet the main service requirements of the satellite component. As satellite bandwidth is a very scarce resource, efficient frequency reuse techniques will play an important role in the successful deployment of the service. For this reason, we propose an efficient frequency reuse technique, designed for an integrated satellite system to support IMT‐Advanced services. In the proposed scheme, satellite and terrestrial components effectively share the same bandwidth. Copyright © 2010 John Wiley & Sons, Ltd.
Net‐centric satellite mesh architecture for emergency communication
Authors: Gopal Rajeev 
Published: October 2010

AbstractThis paper introduces a net‐centric architecture based on ETSI and TIA Regenerative Satellite Mesh‐A (RSM‐A) standard that uses satellites with on‐board packet switching. An Internet Engineering Task Force (IETF) IP protocol family‐based extension of RSM‐A for enhanced user interoperability, combined with multiple spot beam satellite implementation facilitates higher capacity, easy deployment and full mesh terminal‐to‐terminal operation that is required for managing emergency situations. This Net‐centric Satellite Mesh (NSM) architecture adequately addresses the current and evolving networking needs for emergency‐management information systems that can generate high data rate and real‐time multi‐media traffic. The NSM architecture supports the evolving IETF Emergency Telecommunications Service standards with packet flow‐level admission control for guaranteed packet quality‐of‐service needed by real‐time unicast and multicast traffic over satellite networks. The multi‐plane architectural discussion is supported with measurements of selected end‐to‐end application behavior that validate the technical capabilities of NSM by using a pioneering Ka band satellite system, based on RSM‐A, which has recently been deployed in North America. Copyright © 2010 John Wiley & Sons, Ltd.
WISECOM: A rapidly deployable satellite backhauling system for emergency situations
Authors: Berioli Matteo , Chaves Javier Mulero , Courville Nicolas , Boutry Philippe , Fondere Jean‐Louis , Skinnemoen Harald , Tork Hillar , Werner Markus , Weinlich Michael 
Published: October 2010

AbstractThis paper presents the detailed architecture of the WISECOM system, which can quickly re‐establish and provide telecommunication services after a disaster by integrating terrestrial mobile radio networks, such as GSM, WiFi, WiMAX and TETRA, with satellite technologies. The system aims to be a useful tool to be deployed in the early hours after a disaster event, for both the victims and the rescue services who will be able to communicate in a reliable and robust way, improving the coordination of the different teams and reducing the time needed to provide victims with the proper treatment. The paper presents in detail the different services provided by the system taking into account its two different versions, based on two different satellite technologies, Inmarsat BGAN and DVB‐RCS. Together with the presentation of the system capabilities, a business model is also proposed. Thereafter, the architecture of the general system and the demonstrators that have been developed are detailed, according to the two versions of the system. The work also presents the outcomes of the tests conducted with a prototype of the system, and of the final project demonstration, which was held in Germany in May 2008 with the involvement of real end‐users (fire brigades and civil protection authorities). Copyright © 2010 John Wiley & Sons, Ltd.
Blind channel estimation based on maximizing the eigenvalue spread of cumulant matrices in (2 × 1) Alamouti's coding schemes
Authors: Dapena Adriana , Pérez‐Iglesias Héctor J. , Zarzoso Vicente 
Published: October 2010

AbstractThe popular Alamouti orthogonal space time code attains full transmit diversity in multiple antenna systems. This paper addresses the problem of blind channel identification in (2 × 1) Alamouti coded systems. Under the assumption of independent symbol substreams, the channel can be estimated from the eigendecomposition of matrices composed of second‐ or higher‐order statistics (cumulants) of the received signal. The so‐called joint approximate diagonalization of eigenmatrices (JADE) method for blind source separationviaindependent component analysis is optimal in that it tries to simultaneously diagonalize a full set of fourth‐order cumulant matrices. To reduce computational complexity, we perform the eigenvalue decomposition of a single cumulant matrix, which is judiciously chosen by maximizing its expected eigenvalue spread. Simulation results show that the resulting technique outperforms existing blind Alamouti channel estimation methods and achieves a performance close to JADE's at a fraction of the computational cost. Copyright © 2010 John Wiley & Sons, Ltd.
Analysis of thin intermediate layers by confocal µ‐XRF
Authors: Perez Roberto D. , Sánchez Héctor J. , Rubio Marcelo , Perez Carlos A. 
Published: October 2010

AbstractRecently, the capabilities of the micro‐X‐ray fluorescence spectroscopy (µ‐XRF) were expanded by means of a confocal geometry. It consists of X‐ray lenses in the excitation as well as in the detection channel which defines a small probing volume. By moving an intermediate thin homogenous layer in the normal direction through this probing volume, information concerning the thickness and elemental composition can be obtained. For multilayer samples the order of the layers in the stratified structure can be obtained. In this work, we apply a new quantification algorithm for confocal µ‐XRF which can be useful in surface analysis. It is an iterative procedure valid for thin intermediate layers where the exponential attenuation of the X‐ray beams cannot be approximated. The analytical expressions involved in the proposed quantification algorithm for confocal µ‐XRF were adapted from those used for quantification of intermediate thin layers by means of conventional XRF. In this way, some of the analytical processes applied in conventional XRF can be adapted to confocal µ‐XRF. The new algorithm was applied to analyze by confocal µ‐XRF a sample of a paint layer on a glass substrate. To test the precision of the proposed algorithm, the present results were compared with conventional XRF analysis. Copyright © 2010 John Wiley & Sons, Ltd.
Mesopores in USY Zeolites
Authors: Lutz Wolfgang , Enke Dirk , Einicke Wolf‐Dieter , Täschner Dirk , Kurzhals Rolf 
Published: October 2010

AbstractZeolites of type NaY synthesised by use of seed‐solution and zeolite X‐seeds to initialise the crystallisation were compared. A different homogeneity of the internal framework structure related to the Si/Al ratio was expected. Thus, the formation of closed bulk mesopores should be influenced during treatment of NH4NaY modification for 7 hours at 450 °C and 600 °C, respectively, in the water steam of 1 bar. Occurrence of different mesopores was actually observed in obtained ultra‐stable USY zeolites using nitrogen adsorption. Whereas USY prepared by use of seed‐solution contains only open mesopores at the crystal surface, the X‐seed synthesised material contains open and closed mesopores at the surface and in the nuclei of samples, respectively.
Conductance of Graphene Nanoribbon Junctions and the Tight Binding Model
Authors: Wu Y , Childs PA 
Published: October 2010

AbstractPlanar carbon-based electronic devices, including metal/semiconductor junctions, transistors and interconnects, can now be formed from patterned sheets of graphene. Most simulations of charge transport within graphene-based electronic devices assume an energy band structure based on a nearest-neighbour tight binding analysis. In this paper, the energy band structure and conductance of graphene nanoribbons and metal/semiconductor junctions are obtained using a third nearest-neighbour tight binding analysis in conjunction with an efficient nonequilibrium Green's function formalism. We find significant differences in both the energy band structure and conductance obtained with the two approximations.
n-Type Doping of Vapor–Liquid–Solid Grown GaAs Nanowires
Authors: Gutsche Christoph , Lysov Andrey , Regolin Ingo , Blekker Kai , Prost Werner , Tegude Franz-Josef 
Published: October 2010

Abstract
In this letter, n-type doping of GaAs nanowires grown by metal–organic vapor phase epitaxy in the vapor–liquid–solid growth mode on (111)B GaAs substrates is reported. A low growth temperature of 400°C is adjusted in order to exclude shell growth. The impact of doping precursors on the morphology of GaAs nanowires was investigated. Tetraethyl tin as doping precursor enables heavily n-type doped GaAs nanowires in a relatively small process window while no doping effect could be found for ditertiarybutylsilane. Electrical measurements carried out on single nanowires reveal an axially non-uniform doping profile. Within a number of wires from the same run, the donor concentrations N
D of GaAs nanowires are found to vary from 7 × 1017 cm-3 to 2 × 1018 cm-3. The n-type conductivity is proven by the transfer characteristics of fabricated nanowire metal–insulator-semiconductor field-effect transistor devices.
A UPnP extension for enabling user authentication and authorization in pervasive systems
Authors: Sales Thiago , Sales Leandro , Almeida Hyggo , Perkusich Angelo 
Published: October 2010

Abstract
The Universal Plug and Play (UPnP) specification defines a set of protocols for promoting pervasive network connectivity of computers and intelligent devices or appliances. Nowadays, the UPnP technology is becoming popular due to its robustness to connect devices and the large number of developed applications. One of the major drawbacks of UPnP is the lack of user authentication and authorization mechanisms. Thus, control points, those devices acting as clients on behalf of a user, and UPnP devices cannot communicate based on user information. This paper introduces an extension of the UPnP specification called UPnP-UP, which allows user authentication and authorization mechanisms for UPnP devices and applications. These mechanisms provide the basis to develop customized and secure UPnP pervasive services, maintaining backward compatibility with previous versions of UPnP.
Perceptions and attitudes of hospital staff toward paging system and the use of mobile phones
Authors: Haroon Muhammad , Yasin Faiza , Eckel Rachael , Walker Frank 
Published: October 2010

Objectives:Our objective was to document the pattern of mobile phone usage by medical staff in a hospital setting, and to explore any perceived benefits (such as improved communications) associated with mobile phones.Methods:This cross-sectional survey was conducted in Waterford Regional Hospital, Ireland, where bleep is the official system of communication. All non-consultant hospital doctors, of medical disciplines only, were asked to participate. The questionnaire was designed to explore the pattern and different aspects of mobile phone usage.Results:At the time of study, there were sixty medical junior doctors, and the response rate was 100 percent. All participants used mobile phones while at work, and also for hospital-related work. For 98.3 percent the mobile phone was their main mode of communication while in the hospital. Sixty-two percent (n= 37) made 6–10 calls daily purely for work-related business, and this comprised of ≥80 percent of their daily usage of mobile phones. For 98 percent of participants, most phone calls were work-related. Regarding reasons for using mobile phones, all reported that using mobile phone is quicker for communication.Conclusions:Mobile phone usage is very common among the medical personnel, and this is regarded as a more efficient means of communication for mobile staff than the hospital paging system.
Implanting inequality: Empirical evidence of social and ethical risks of implantable radio-frequency identification (RFID) devices
Authors: Monahan Torin , Fisher Jill A. 
Published: October 2010

Objectives: The aim of this study was to assess empirically the social and ethical risks associated with implantable radio-frequency identification (RFID) devices.Methods: Qualitative research included observational studies in twenty-three U.S. hospitals that have implemented new patient identification systems and eighty semi-structured interviews about the social and ethical implications of new patient identification systems, including RFID implants.Results: The study identified three primary social and ethical risks associated with RFID implants: (i) unfair prioritization of patients based on their participation in the system, (ii) diminished trust of patients by care providers, and (iii) endangerment of patients who misunderstand the capabilities of the systems.Conclusions: RFID implants may aggravate inequalities in access to care without any clear health benefits. This research underscores the importance of critically evaluating new healthcare technologies from the perspective of both normative ethics and empirical ethics.
Consumption of whole grains is associated with improved diet quality and nutrient intake in children and adolescents: the National Health and Nutrition Examination Survey 1999–2004
Authors: O’Neil Carol E , Nicklas Theresa A , Zanovec Michael , Cho Susan S , Kleinman Ronald 
Published: October 2010

AbstractObjectiveTo examine the association of consumption of whole grains (WG) with diet quality and nutrient intake in children and adolescents.DesignSecondary analysis of cross-sectional data.SettingThe 1999–2004 National Health and Nutrition Examination Survey.SubjectsChildren aged 2–5 years (n2278) and 6–12 years (n3868) and adolescents aged 13–18 years (n4931). The participants were divided into four WG consumption groups: ≥0 to <0·6, ≥0·6 to <1·5, ≥1·5 to <3·0 and ≥3·0 servings/d. Nutrient intake and diet quality, using the Healthy Eating Index (HEI)-2005, were determined for each group from a single 24 h dietary recall.ResultsThe mean number of servings of WG consumed was 0·45, 0·59 and 0·63 for children/adolescents at the age of 2–5, 6–12 and 13–18 years, respectively. In all groups, HEI and intakes of energy, fibre, vitamin B6, folate, magnesium, phosphorus and iron were significantly higher in those consuming ≥3·0 servings of WG/d; intakes of protein, total fat, SFA and MUFA and cholesterol levels were lower. Intakes of PUFA (6–12 years), vitamins B1(2–5 and 13–18 years), B2(13–18 years), A (2–5 and 13–18 years) and E (13–18 years) were higher in those groups consuming ≥3·0 servings of WG/d; intakes of added sugars (2–5 years), vitamin C (2–5 and 6–12 years), potassium and sodium (6–12 years) were lower.ConclusionsOverall consumption of WG was low. Children and adolescents who consumed the most servings of WG had better diet quality and nutrient intake.
New Systematic Insights in the Ceramium Sinicolacomplex: Resurrection of C. Interruptum S. & G. (Ceramiaceae, Rhodophyta)
Authors: Cho T. O. , Fredericq S. , Murray S. N. , Boo S. M. 
Published: October 2010

AbstractSetchell & Gardner (1924) provided a taxonomic treatment for the genus Ceramium from lower California and the Gulf of California, Mexico, in which they described several new species, including C. sinicola S. & G. described from Ensenada, BCN and C. interruptum S. & G. described from the vicinity of La Paz, BCS. The latter was later reduced to variety rank in C. sinicolaby Dawson (1950), a taxonomic decision that has subsequently been widely adopted. Phylogenetic analyses inferred from three molecular markers (chloroplast‐encoded rbcL, the RUBISCO spacer, and nuclear encoded SSU rDNA) from recent collections from the Pacific North‐west (California, Oregon) and the Gulf of California reveal a well supported assemblage of three corticated taxa: C. codicolaJ. Ag. 1894, C. sinicola and C. sinicola var. interruptum. Sequence divergence values among the three taxa are sufficient to warrant separate species ranking; hence, we reinstate C. interruptum as a widely distributed epiphyte for the region. C. sinicolais more closely related to C. codicolathan to C. interruptum, with the former two restricted to the host Codium. The molecule‐based relationships are congruent with evolutionary trends in cortication pattern and attachment mode.
Comparative Phylogeography of Reticulate Cladophoralean Algae
Authors: Wysor B. , Kooistra Wiebe H. C. F. , Fredericq Suzanne 
Published: October 2010

AbstractThe study of species distributions requires well‐defined species concepts and well‐resolved species relationships. Ideally, the biogeography of taxa will be concordant with their genetic signatures identified by molecular markers. For groups with poorly defined species (or generic) concepts, taxon sampling can be highly problematic because morphological plasticity may deter sample collection of a species when it expresses alternative morphologies. This may give the impression of a disjunct species distribution when it is actually continuous across a particular geographic range. Likewise, morphological convergence can obscure biogeographic patterns, but with the opposite effect. To avoid taxon sampling problems in a phylogeographic study of the green alga Phyllodictyon anastomosans (Harv.) Kraft et Wynne, a species known for its morphological variability, we included taxa across four genera (Boodlea G. Murray & De Toni, Cladophoropsis Børgesen, Phyllodictyon J. E. Gray, Struveopsis Rhyne et H. Robinson) often characterized by overlapping character states. The inclusion of isolates outside the taxonomic boundaries of P. anastomosans allowed us to extend earlier phylogeographic studies of the closely related C. membranacea (C. agardh) Børgesen and compare patterns between two closely related taxa. Results suggest that the Central American Isthmus represents a formidable but permeable barrier to dispersal.
The Monophyletic Origin of the Peridinin‐, and Fucoxanthin‐Containing Dinoflagellate Plastid Through Tertiary Replacement
Authors: Yoon H. S. , Hackett J. D. , Bhattacharya D. 
Published: October 2010

AbstractThe dinoflagellates contain diverse plastids of uncertain origin. To determine the origin of the peridinin‐ and fucoxanthin‐containing dinoflagellate plastid, we sequenced the plastid‐encoded psaA, psbA, and rbcL genes from various red and dinoflagellate algae. The psbA gene phylogeny, which was made from a dataset of 15 dinoflagellates, 22 rhodophytes, five cryptophytes, seven haptophytes, seven stramenopiles, two chlorophytes, and a glaucophyte as the outgroup, supports monophyly of the peridinin‐, and fucoxanthin‐containing dinoflagellates, as a sister group to the haptophytes. The monophyletic relationship with the haptophytes is recovered in the psbA + psaA phylogeny, with stronger support. The rubisco tree utilized the ‘Form I’ red algal type of rbcL and included fucoxanthin‐containing dinoflagellates. The dinoflagellate + haptophyte sister relationship is also recovered in this analysis. Peridinium foliaceum is shown to group with the diatoms in all the phylogenies. Based on our analyses of plastid sequences, we postulate that: (1) the plastid of peridinin‐, and fucoxanthin‐containing dinoflagellates originated from a common ancestor; (2) the ancestral dinoflagellate acquired its plastid from a haptophyte though a tertiary plastid replacement; (3) ‘Form II’ rubisco replaced the ancestral rbcL after the divergence of the peridinin‐, and fucoxanthin‐containing dinoflagellates; and (4) we confirm that the plastid of P. foliaceum originated from a Stramenopiles endosymbiont.