bluuebunny/crossref_metadata_2025_split huggingface dataset:
The intensity of recent and distant life regrets: an integrated model and a large scale survey
Authors: Bonnefon Jean‐François , Zhang Jiehai 
Published: August 2007

AbstractThe research considers three predictors of the intensity of life regrets: (a) whether the regretted behaviour is an action or a failure to act, (b) the severity of its consequences and (c) the extent to which the behaviour was justified. It is hypothesised that the intensity of recent and distant regrets will be predicted by different combinations of these predictors. Regression analyses on regrets reported by 957 French adults support this hypothesis. The intensity of recent regrets is predicted by the consequences of the behaviour, and especially so for actions. The intensity of distant regrets is predicted by the consequences of the behaviour and by its justification, the effect of justification being stronger for actions than for inactions. These results are discussed in relation to both laboratory and field studies of regret. Copyright © 2007 John Wiley & Sons, Ltd.
Computer‐mediated communication: synchronicity and compensatory effort
Authors: Münzer Stefan , Borg Anna 
Published: August 2007

AbstractGroups might perform compensatory communicative actions if media characteristics impede a particular communication process. The present study examined this hypothesis for the process of information integration, which is a sub‐task in collaborative problem‐solving. Synchronous media characteristics support the information integration process, while asynchronous media characteristics impede it. The synchronicity of the medium was varied by manipulating parallelism and the immediacy of feedback within real‐time, text‐based computer‐mediated communication. A Conversational Games Analysis (CGA) was performed in order to investigate the functional purposes of the task‐oriented contributions. All groups successfully solved the problem. However, groups interacting in the asynchronous communication mode produced significantly more functional contributions for the purpose of mutual task‐oriented understanding and clarification, compared to the synchronous groups. Moreover, members of asynchronous groups repeated unshared pieces of information more often. These differences are interpreted as communicative efforts that balance the hindering influence of asynchronous media characteristics on the process of information integration. Copyright © 2007 John Wiley & Sons, Ltd.
Safety verification and adaptive model predictive control of the hybrid dynamics of a fuel cell system
Authors: Fiacchini M. , Alamo T. , Alvarado I. , Camacho E. F. 
Published: August 2007

AbstractThe problem of safety verification of a fuel cell (FC) system is addressed in this paper. The aim of safety verification is to check whether the oxygen ratio can reach dangerous values or not. Assuming that the compressor voltage is controlled by means of a feedforward control, two algorithms for safety verification are formulated and applied to the PWA model of the FC. An improved behavior is obtained using an adaptive predictive controller to determine the voltage to be applied to the compressor. An admissible robust control invariant set for the PWA model of the system is computed. The control action of the predictive controller is obtained in such a way that the state is always included in the safe region provided by the admissible robust control invariant set. This guarantees that the proposed controller always provides safe evolutions of the system. Copyright © 2007 John Wiley & Sons, Ltd.
Adaptive hybrid predictive control for a combined cycle power plant optimization
Authors: Sáez D. , Zúñiga R. , Cipriano A. 
Published: August 2007

AbstractThe design and development of an adaptive hybrid predictive controller for the optimization of a real combined cycle power plant (CCPP) are presented. The real plant is modeled as a hybrid system, i.e. logical conditions and dynamic behavior are used in one single modeling framework. Start modes, minimum up/down times and other logical features are represented using mixed integer equations, and dynamic behavior is represented using special linear models: adaptive fuzzy models. This approach allows the tackling of special non‐linear characteristics, such as ambient temperature dependence on electrical power production (combined cycle) and gas exhaust temperature (gas turbine) properly to fit into a mixed integer dynamic (MLD) model. After defining the MLD model, an adaptive predictive control strategy is developed in order to economically optimize the operation of a real CCPP of the Central Interconnected System in Chile. The economic results obtained by simulation tests provide a 3% fuel consumption saving compared to conventional strategies at regulatory level. Copyright © 2007 John Wiley & Sons, Ltd.
Multiple robust track‐following controller design in hard disk drives
Authors: Choi Jongeun , Nagamune Ryozo , Horowitz Roberto 
Published: August 2007

AbstractThis paper presents a new technique for track‐following control in hard disk drives, in order to achieve high tracking precision of magnetic read–write headsuniformlyfor a huge number of disk drives. The basic idea in this technique is to classify the disk drives into several sets depending on dynamics properties, and to apply a robust controller to each set. The problem of designing the optimal classification of dynamics and the corresponding optimal robust controllers is formulated as a nonconvex optimization problem, for which sub‐optimal solutions are to be found numerically. A numerical simulation shows the usefulness of the proposed technique by illustrating a tracking performance improvement. Copyright © 2007 John Wiley & Sons, Ltd.
Application of model‐free LQG subspace predictive control to TCP congestion control
Authors: Chiera Belinda A. , White Langford B. 
Published: August 2007

AbstractWe investigate the application of a model‐free linear quadratic Gaussian (LQG) subspace‐based predictive controller to Internet congestion control. Specifically, we consider a classically designed LQG linear congestion controller with a non‐standard performance index and determine whether a model‐free controller is a viable alternative in this instance. We employ the model‐free subspace predictive controller methodology which we customize for end‐to‐end transmission control protocol (TCP) congestion control. A series of network simulations support the use of the more easily implementable model‐free controller over its classical analogue. We further demonstrate that the model‐free controller provides increased stability under transient network conditions when compared with the first feedback congestion controller, TCP Vegas. Copyright © 2007 John Wiley & Sons, Ltd.
Colloidal Photonic Crystals Doped with Gold Nanoparticles: Spectroscopy and Optical Switching Properties
Authors: Morandi V. , Marabelli F. , Amendola V. , Meneghetti M. , Comoretto D. 
Published: August 2007

AbstractPolystyrene artificial opals with few gold nanoparticles (AuNp) embedded in the interstices (doping) are grown by using the meniscus technique starting from a mixed suspension of microspheres and AuNp. Samples having different sphere diameters and nanoparticle loads have been prepared. Their reflectance spectra clearly show a dramatic bathochromic shift of the photonic stop band (up to 1400 cm–1) and a reduction of its full width half maximum, due to an increase of the effective refractive index of about 8 % with respect to bare opals, which is accounted for by analytical theoretical models. Reflectance spectra do not show any direct evidence of AuNp absorption even at the higher AuNp doping level. Nanosecond transient absorption measurements on these systems indicate that a variation of transmission (optical switching) of about 150 % is observed for AuNp doped opals upon photoexcitation with 9 ns laser pulses at 532 nm. No switching is instead observed for bare opals.
Synthesis of NaYF4 Nanocrystals with Predictable Phase and Shape
Authors: Liang X. , Wang X. , Zhuang J. , Peng Q. , Li Y. 
Published: August 2007

AbstractIn this Full Paper, a water/alcohol/oleic acid system was developed to prepare NaYF4 nanocrystals with predictable size, shape and phase. The structural and kinetic factors that govern the phase and shape evolution of NaYF4 nanocrystals have been carefully studied, and the influence of NaF to Y3+ ratio, reaction time and temperature on the phase and shape evolution of the as‐prepared NaYF4 samples was systematically investigated and discussed. It was found that the NaF to Y3+ ratio was responsible for the shape evolution while temperature and reaction time was the key for the phase control of the NaYF4 nanocrystals. This study would be suggestive for the precisely controlled growth of inorganic nanocrystals, especially for those usually crystallizing in diverse crystal structures.
Polypyrrole Microtubule Actuators for Seizing and Transferring Microparticles
Authors: He X. M. , Li C. , Chen F. E. , Shi G. Q. 
Published: August 2007

AbstractBilayer actuators consisting of a layer of aligned PPy microtubules with the length of 15 μm and a layer of compact PPy film with the thickness of 15 μm have been fabricated. The actuators can bend to an angle much larger than 90° at an actuation rate of ∼ 100° s–1 under a driving potential of 0.8 V versus Ag/AgCl. The microtubule layers of both type actuators are “sticky”, and can capture or trap polystyrene microparticles from their dilute dispersions. Moreover, the captured particles can be extensively released by sonication or partly released by electrochemically reducing the actuators in the aqueous electrolytes. On the basis of extensive investigations including controlling the conditions of electrochemical actuation and the redox states of PPy microtubules, adjusting the particle size and composition, possible mechanisms for capturing and releasing microparticles were proposed.
Saccharide Blocking Layers in Solid State Dye Sensitized Solar Cells
Authors: Handa S. , Haque S. A. , Durrant J. R. 
Published: August 2007

AbstractThe adsorption of saccharides on dye sensitized, nanocrystalline metal oxide films is shown to improve the efficiency of solid state dye sensitized solar cells. The function of the saccharide treatment is evaluated by transient optical studies, and correlated with device photovoltaic performance. A range of saccharides, including cyclodextrins and their linear analogue amylose, are investigated. The saccharide blocking layer is shown to retard interfacial charge recombination losses, resulting in increased device open circuit voltage. Highest device performance is achieved with linear saccharide amylose, resulting in a 60 % improvement in device efficiency relative to the non‐treated control, with a device open circuit voltage of 1 V.
Mechanical Properties and Flame‐Retardant Behavior of Ethylene Vinyl Acetate/High‐Density Polyethylene Coated Carbon Nanotube Nanocomposites
Authors: Peeterbroeck S. , Laoutid F. , Taulemesse J.‐M. , Monteverde F. , Lopez‐Cuesta J.‐M. , Nagy J. B. , Alexandre M. , Dubois P. 
Published: August 2007

AbstractHigh‐density polyethylene coated multiwalled carbon nanotubes (c‐MWNTs) and multiwalled carbon nanotubes (MWNTs) have been dispersed into an ethylene vinyl acetate (EVA) copolymer by mechanical kneading. The effect of c‐MWNTs on tensile properties, thermo‐oxidative degradation, and fire behavior has been studied in comparison with virgin EVA and EVA/MWNTs nanocomposites. Due to the better dispersion of the coated nanotubes, the incorporation of 3 wt % of c‐MWNTs leads to an increase of the Young's modulus, the cohesion of the combustion residues, and a decrease of the peak heat‐release rate.
Fluorescence Quenching upon Binding of Copper Ions in Dye‐Doped and Ligand‐Capped Polymer Nanoparticles: A Simple Way to Probe the Dye Accessibility in Nano‐Sized Templates
Authors: Gouanvé F. , Schuster T. , Allard E. , Méallet‐Renault R. , Larpent C. 
Published: August 2007

AbstractThe synthesis and properties of well‐defined core–shell type fluorescent metal‐chelating polymer nanoparticles NP, in the 15 nm diameter range, with a fluorophore (9,10‐diphenylanthracene: DPA) entrapped in the particle core and a selective ligand (1,4,8,11‐tetraazacyclotetradecane: Cyclam), grafted onto the surface are presented. NPs with different number of dye‐per‐particle are readily obtained by entrapment of the fluorophore within the polymer core. The ligand‐coated NPs exhibit a high affinity for Cu2+ ions in aqueous solution and quenching of the DPA fluorescence is observed upon binding of copper. The quenching of fluorescence arises through energy transfer (FRET) from the dye to the copper‐cyclam complexes that form at the NP surface with an operating distance (d) in the 2 nm range. A simple core–shell model accounts for the steady‐state and time‐resolved fluorescence titration experiments: dye molecules located in the outer sphere (thickness d) of the NPs are quenched while the fluorescence of dyes embedded more deeply is not affected by the binding of copper ions. The observed high quenching efficiency (60–65 %), which is tightly correlated to the volumic and microstructural features of the NPs, shed light on the enhanced accessibility inherent in nano‐sized templates. The response towards different metal ions was investigated and this confirmed the selectivity of the nanoparticle template‐assembled sensor for cupric ions.
Tough, Semiconducting Polyethylene‐poly(3‐hexylthiophene) Diblock Copolymers
Authors: Müller C. , Goffri S. , Breiby D. W. , Andreasen J. W. , Chanzy H. D. , Janssen R. A. J. , Nielsen M. M. , Radano C. P. , Sirringhaus H. , Smith P. , Stingelin‐Stutzmann N. 
Published: August 2007

AbstractSemiconducting diblock copolymers of polyethylene (PE) and regioregular poly(3‐hexylthiophene) (P3HT) are demonstrated to exhibit a rich phase behaviour, judicious use of which permitted us to fabricate field‐effect transistors that show saturated charge carrier mobilities, μFET, as high as 2 × 10–2 cm2 V–1 s–1 and ON‐OFF ratios, Ion/Ioff ∼ 105 at contents of the insulating PE moiety as high as 90 wt %. In addition, the diblock copolymers display outstanding flexibility and toughness with elongations at break exceeding 600 % and true tensile strengths around 70 MPa, opening the path towards robust and truly flexible electronic components.
Electro‐Optical Study of Subphthalocyanine in a Bilayer Organic Solar Cell
Authors: Gommans H. H. P. , Cheyns D. , Aernouts T. , Girotto C. , Poortmans J. , Heremans P. 
Published: August 2007

AbstractUltra‐thin films of subphthalocyanine (SubPc) were grown onto Si/SiO2 substrates by organic molecular beam deposition and the complex refractive index has been characterized by spectroscopic ellipsometry. The peak maximum in the extinction coefficient is determined to be 1.6 at 590 nm and the dielectric constant equals 3.9 in the limit of long wavelength. These values are extraordinary high when compared to the well‐known metal‐phthalocyanines and will be beneficial for the performance in a photovoltaic cell. The amorphous SubPc structure on top of indium‐tin‐oxide (ITO) as well as quartz glass is imaged by atomic force microscopy and scanning electron microscopy and we have characterized the nearly flat surface topology. Next, subphthalocyanine films in combination with buckminsterfullerene (C60) have been studied in a planar bilayer donor/acceptor heterojunction by current density‐voltage characterization under AM 1.5 simulated illumination at various light intensities. A power conversion efficiency of 3.0 % under 1 sun was measured. Finally, the external and internal quantum efficiencies demonstrated peak maxima at 590 nm of 46 % and 55 %, respectively. Considering the abrupt junction at the donor/acceptor interface, the electron transfer from SubPc to the acceptor material is thus determined to be highly efficient.
Boron Nitride Nanotubes
Authors: Golberg D. , Bando Y. , Tang C. C. , Zhi C. Y. 
Published: August 2007

AbstractThe current status of research on boron nitride nanotubes (BNNTs)—carbon nanotube structural analogues—is discussed. Latest achievements in BNNT synthesis, morphology, and atomic structure analysis as well as physical, chemical, and functional property evaluations are reviewed. Similarities and differences between structural parameters and properties of BNNTs in comparison with conventional carbon nanotubes are particularly highlighted. Recent breakthroughs in BNNT filling, doping and functionalization, morphology, and electronic structure engineering are examined. Finally, prospective BNNT applications for fabricating field‐effect transistors, gas accumulators, and reinforcing polymer films are presented.
Inside Front Cover: Towards Understanding Why a Superhydrophobic Coating Is Needed by Water Striders (Adv. Mater. 17/2007)
Authors: Shi F. , Niu J. , Liu J. , Liu F. , Wang Z. , Feng X.‐Q. , Zhang X. 
Published: August 2007

AbstractGold threads modified with superhydrophobic or normal hydrophobic coatings are used as model system in the study of the contribution of a superhydrophobic coating of water striders to their floating and movement on water surfaces. After depositing Pt aggregates on one of its ends, the gold threads are able to move in the H2O2 aqueous solution. The superhydrophobic coating is proven to be able to decrease fluidic drag during motion, as described by Xi Zhang and co‐workers on p. 2257.
N‐Arylation of Heterocycles with Activated Chloro‐ and Fluoroarenes using Nanocrystalline Copper(II) Oxide
Authors: Kantam M. Lakshmi , Yadav Jagjit , Laha Soumi , Sreedhar Bojja , Jha Shailendra 
Published: August 2007

AbstractNanocrystalline copper oxide was found to be an effective heterogeneous catalyst for the N‐arylation of heterocycles with activated chloro‐ and fluoroarenes using potassium carbonate as base. N‐Arylated products were isolated in good to excellent yields. The catalyst can be used for five cycles with almost consistent activity.
A Practical Synthesis of Multifunctional Ketones through the Fukuyama Coupling Reaction
Authors: Mori Yoshikazu , Seki Masahiko 
Published: August 2007

AbstractA highly efficient, robust and scalable protocol for the synthesis of multifunctional ketones through Fukuyama coupling, i.e., cross‐coupling of thiol esters with zinc reagents, has been developed. Treatment of thiol esters with alkylzinc iodides or dialkyl zincs in the presence of palladium on activated carbon (Pd/C) or palladium acetate [Pd(OAc)2] furnished the corresponding ketones in high yields. Evaluation of the properties‐activities relationship of the Pd/C‐catalyzed reaction has proven that oxidic Pd/C is much more potent than reduced Pd/C in the reaction of thiolactone1awith zinc reagent2a. Based on the dependence of the Pd/C‐catalyzed reaction on the nature of Pd/C in combination with the extent of the Pd leaching from Pd/C to the solution, a dual reaction mechanism for the Pd/C‐catalyzed Fukuyama coupling reaction, which includes heterogeneous and homogeneous catalytic cycles, was proposed. The marked reduction of the zinc reagents and the use of Pd(OAc)2in much smaller amounts were achieved when zinc bromide was added. This supports a hypothesis where a shift of the Schlenk equilibrium from inactive dialkylzincs (R2Zn) to active organozinc species, such as alkylzinc halides (RZnX) and three‐coordinate species [(RZnX2)−⋅ (ZnX)+], and generation of the stabilized monomeric Pd complexes during the reaction, may facilitate the reaction.
Incorporation of Primary Amines into a Polyester Chain by a Combination of Chemical and Lipase‐Catalyzed ε‐Caprolactone Ring‐Opening Processes
Authors: Marzorati Mattia , Hult Karl , Riva Sergio , Danieli Bruno 
Published: August 2007

AbstractA simple chemoenzymatic strategy for the incorporation of bioactive and suitably functionalized molecules into a polyester chain has been developed. The protocol involves first the reaction of a primary amine with ε‐caprolactone to give an amide carrying a terminal primary hydroxy group, followed by the enzymatic growth of the polymeric chain triggered by Novozym 435. This method is versatile and easy to handle and is suitable for the incorporation of different amines into polyesters, as has been shown with the model compounds benzylamine and tryptamine, the bioactive compound N‐deacetylthiocolchicine and the functionalized propargylamine and tyramine .
Rhodium and Iridium Nanoparticles Entrapped in Aluminum Oxyhydroxide Nanofibers: Catalysts for Hydrogenations of Arenes and Ketones at Room Temperature with Hydrogen Balloon
Authors: Park In Soo , Kwon Min Serk , Kang Kyung Yeon , Lee Jae Sung , Park Jaiwook 
Published: August 2007

AbstractThe recyclable metal nanoparticle catalysts, rhodium in aluminum oxyhydroxide [Rh/AlO(OH)] and iridium in aluminum oxyhydroxide [Ir/AlO(OH)], were simply prepared from readily available reagents. The catalysts showed high activities in the hydrogenation of various arenes and ketones under mild conditions. Selective hydrogenation was possible for bicyclic and tricyclic arenes in high yields. The catalysts were active at room temperature even with a hydrogen balloon. Also, the catalysts showed high turnover frequency (TOF) values under solventless conditions at 75 °C under 4 atm hydrogen pressure: ca. 1700 h−1 in the hydrogenation of benzene. Furthermore, Rh/AlO(OH) can be reused for at least 10 times without activity loss. The catalysts were characterized by the transmission electron microscopy (TEM), powder X‐ray diffraction (XRD), inductively coupled plasma (ICP), energy dispersive X‐ray analysis (EDX), X‐ray photoelectron spectroscopy (XPS), nitrogen adsorption and hydrogen chemisorption experiments. The sizes of rhodium and iridium particles were estimated to be 3–4 nm and 2–3 nm, respectively. Aluminum oxyhydroxide nanofibers of these catalysts have surface areas of 500–600 m2 g−1.
β‐Cyclodextrin‐Catalyzed Monosulfonylation of Amines and Amino Acids in Water
Authors: Sridhar R. , Srinivas B. , Kumar V. Pavan , Narender M. , Rao K. Rama 
Published: August 2007

AbstractA mild and efficient procedure has been developed for the first time under biomimetic conditions for the monosulfonylation of various amines and amino acids catalyzed by β‐cyclodextrin in water at room temperature to afford the corresponding sulfonamides in high yields.
Mechanochemical Aminochlorination of Electron‐Deficient Olefins with Chloramine‐T Promoted by (Diacetoxyiodo)benzene
Authors: Wang Guan‐Wu , Wu Xue‐Liang 
Published: August 2007

AbstractA direct and convenient procedure for the solvent‐free mechanochemical aminochlorination of electron‐deficient olefins promoted by (diacetoxyiodo)benzene [PhI(OAc)2] was described using commercially available and cheap chloramine‐T as a nitrogen and chlorine source. The vicinal chloramine derivatives were obtained in high regio‐ and stereoselectivity with good yields. PhI(OAc)2 was superior to metal salts for the aminochlorination of electron‐deficient olefins.
Supported Ultra Small Palladium on Magnetic Nanoparticles Used as Catalysts for Suzuki Cross‐Coupling and Heck Reactions
Authors: Yinghuai Zhu , Peng Ship Chee , Emi A. , Zhenshun Su , Monalisa  , Kemp Richard A. 
Published: August 2007

AbstractApplication of transition metal nanoparticles as catalysts for organic transformations has been attracting wide interest as nanoparticle‐based catalytic systems might exhibit superior catalytic activities than the corresponding bulk materials. However, the main difficulty is that such small particles are almost impossible to separate by conventional means, which can lead to the blocking of filters and valves by the nanoparticle catalyst. We have conveniently prepared ultra small palladium(0) particles (less than 1 nm) on magnetic nanoparticle supports, in which immobilized auxiliaries are used as stabilizing ligands. These catalysts were active for Suzuki cross‐coupling and Heck reactions giving isolated yields of 83 % and 56 %, respectively. In addition, the catalyst can be easily separated using a magnet and reused several times with sustained activity.