bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ninety Years of Drosophila melanogaster Hybrids
Authors: Barbash Daniel A 
Published: September 2010

Abstract
Within 10 years of the beginning of experimental genetic research on Drosophila melanogaster, in 1919, A. H. Sturtevant discovered its sibling species, D. simulans. He hybridized the two species and made fundamental discoveries about the genetic basis of hybrid incompatibility. The complete sterility of surviving F1 hybrids frustrated Sturtevant and his vision of comprehensively exploring the genetics of interspecific differences. But over the next 90 years, a combination of clever genetic tricks and close observation of natural variation has led to a wealth of discovery using these and other hybrids of D. melanogaster and D. simulans, resulting in an advanced understanding of speciation and the evolution of morphology, gene regulation, and behavior.
Hexathiapentacene Nanowires as Chemical Vapor Sensors
Authors: Gao Ting , Garcia-Berrios Edgardo , Briseno Alejandro L , Wang Jian , McConville Richard , Ellsworth Mark W , Dupon Ryan W , Lewis Nathan 
Published: September 2010

AbstractSemiconducting hexathiapentacene (HTP) single–crystal nanowires were synthesized using a simple solution-phase route. Quartz Crystal Microbalance and complex resistance measurements were employed to investigate the sensing properties of an HTP nanowire to analytes including acid, amine, and hydrocarbon vapors. Cole-Cole plots (0.01Hz-4 MHz) of measured impedance spectra, modeled using equivalent circuits, were used to resolve the effects of adsorption and charge migration.
Hydration Effect Analysis of Ion-sensitive Field Effect Transistor
Authors: Jiao Lihong , Rybachek Mykhaylo 
Published: September 2010

AbstractIn this work, the drift of ISFET characteristics due to hydration effect was studied. The ISFETs were fabricated using the standard NMOS process. The AgCl reference electrode was fabricated with the electrolysis method. The ISFET modeling was carried out in MATLAB to study the time variation of surface potential and the drain-source current. In addition, the surface morphology and dielectric constant of silicon dioxide were tested to study the hydration effect in order to eliminate the drift. The dielectric constant of the gate oxide increases exponentially with hydration time. The surface morphology studied with the atomic force microscope (AFM) showed no significant change after immersion in water. It is believed that the main cause of the drift is the hydration effect, which is due to the change in dielectric constant of the sensing material and a small number of surface binding sites that react slowly to a change in pH.
Nanocomposite Route to Ultra-sensitive Surface Enhanced Raman Scattering Substrates
Authors: Biswas Abhijit , Bayer Ilker , Biris Alexandru S. 
Published: September 2010

AbstractWe show a novel route to prepare SERS substrates, which is based on polymer–metal nanocomposites with a specific structure and composition just below the percolation threshold. The neighboring nanoparticles are still quite densely packed, but remain separated by narrow polymer gaps (<1 nm). Such a nanostructure allows the creation of densely packed hot spots where electromagnetic energy can be confined. The polymer–metal nanocomposites are fabricated by a simple and single-step method of electron-beam-assisted vapor-phase co-deposition. The preparation of the SERS substrates is based on a simple plasma-etching process, which removes the polymer structures that allow the formation of metal nanoparticle SERS nano-aggregates with very uniform and controllable inter-particle gaps. The method results in “ideal SERS hot spots” throughout the matrix. These hot spots can be created over very large areas. The prepared SERS substrates are promising candidates for the direct detection (label-free) and analysis of various biological and chemical samples.
Nanoimprint Lithography with UV-Curable Hyperbranched Polymer Nanocomposites for Optical Biosensing Applications
Authors: Geiser Valérie , Leterrier Yves , Månson Jan-Anders , Sanjines Rosendo , Voirin Guy , Wiki Max 
Published: September 2010

AbstractPolymer nanocomposite gratings with a 363 nm period and a 12 nm step height were replicated using a glass master in a rapid, low-pressure imprint process. The composite materials were based on a UV-curable acrylated hyperbranched polymer and nanosized SiO2 particles. The influence of particle fraction up to 25 vol%, process pressure and UV intensity on the grating geometry was analyzed using atomic force microscopy. The period of the grating was found to be identical to that of the glass master for all investigated conditions. It was shown that the gel point of the nanocomposite was an important factor that determined the stability as well as the dimensions of the imprinted structure. However, a distortion of the grating was observed with increasing fraction of SiO2, which was correlated to the increased internal stress of the composite. Wavelength interrogated optical sensors were produced by depositing a high refractive index TiO2 layer on the composite gratings. The laser signal strength of the polymer sensors was equal to that of the reference high precision glass sensor with 10-12 g/mm2 sensitivity. The strength was lower for the nanocomposites due to propagation losses argued to result from residual porosity.
Silicon-based Micro Platforms for Characterization of Nanostructured Layers With Application in Intermediate Temperature Micro Solid Oxide Fuel Cells
Authors: Garbayo Inigo , Tarancón Albert , Santiso José , Cavallaro Andrea , Gràcia Isabel , Cané Carles , Sabaté Neus 
Published: September 2010

AbstractThe present work is devoted to study the development of yttria-stabilized zirconia membranes self-supported on silicon-based microplatforms, to be used as electrolytes on micro solid oxide fuel cells. The microfabrication process to obtain yttria-stabilized zirconia membranes is detailed, and some key aspects for the integration of yttria-stabilized zirconia films deposited by pulsed laser deposition on the silicon-based microplatform are shown. Moreover, the effect on the thermomechanical stability of different fabrication parameters is presented, as well as the way to control the pinhole generation on the membranes. Finally, some electrical characterization guidelines are included, in order to study the effects of the platform and the membrane dimensions on the different measurements performed.
Multi-phase biocomposite material in-situ fabricated by using hydroxyapatite and amorphous nanosilica
Authors: Hesaraki Saeed , Nazarian Hamid , Alizadeh Masoud 
Published: September 2010

Abstract
In the present study hydroxyapatite (HA) and HA/nanosilica (NS) slurries were separately prepared by adding precipitated HA to distilled water and to colloidal silica suspension, respectively and their rheological properties were compared to each other. Both slurries where then dried, powdered, compacted as disks and sintered at 1 100–1 300°C to evaluate and compare their physical, mechanical and some biological properties. The results showed that the HA/NS slurry was more stable and thixotropic than the pure HA slurry. X-ray diffraction analysis showed that the sintered HA/NS was a multi-phase material composed of apatite, tricalcium phosphate, cristobalite and amorphous glass, depending on sintering temperature. Both mechanical and biological properties of the composite were considerably better than those of sintered HA. Bioactivity of the composite was confirmed by precipitation of apatite nanocrystals onto the surfaces of the sample after soaking in simulated body fluid. The results of cell culture tests showed the same proliferation rate of rat calvaria osteoblasts on both sintered HA and composite with higher alkaline phosphatase activity for the latter. The results indicated that the composite with improved mechanical and biological properties may act more successfully than HA as a bone scaffold material.
Interval observer design based on nonlinear hybridization and practical stability analysis
Authors: Meslem N. , Ramdani N. 
Published: September 2010

AbstractIn this paper we design an interval observer for nonlinear uncertain continuous‐time dynamical systems, in the unknown‐but‐bounded error framework. We show how to generate two coupled hybrid observers, which yield the best conservative upper and lower component‐wise bounds for the state, provided bounds are available for initial conditions and uncertainties. The interval observer depends on a tuning gain, which is chosen to satisfy the practical stability of a given hybrid dynamical system. An example is studied to emphasize the performance of our method. Copyright © 2010 John Wiley & Sons, Ltd.
Model and experience‐based initial input construction for iterative learning control
Authors: Freeman C. T. , Alsubaie M. A. , Cai Z. , Rogers E. , Lewin P. L. 
Published: September 2010

AbstractThe initial choice of input in iterative learning control (ILC) generally has a significant effect on the error incurred over subsequent trials. In this paper, techniques are developed that use experimental data gathered over previous applications of ILC in order to generate an initial input signal for the tracking of a new reference trajectory. A model‐based approach is then incorporated to overcome the limitation of insufficient previous experimental data, and a robust design procedure is developed. Experimental evaluation results are obtained using a gantry robot facility. Copyright © 2010 John Wiley & Sons, Ltd.
Restricted diagonal detection filter and updating strategy for multiple fault detection and isolation
Authors: Keller Jean‐Yves , Sauter Dominique 
Published: September 2010

AbstractIn this paper, a restricted diagonal detection filter for multiple fault detection and isolation in linear discrete‐time stochastic systems is presented. The proposed filter makes it possible to generate a minimum variance white innovation sequence having directional properties in response to each fault. For detection and isolation of multiple impulsive faults, a bank of generalized likelihood ratio (GLR) tests is applied to the innovation sequence generated by the detection filter. It is shown that this strategy extends the GLR test of Willsky and Jones (IEEE Trans. Automat. Control 1976; 21(1):108112) to the case of multiple impulsive faults appearing simultaneously. Copyright © 2010 John Wiley & Sons, Ltd.
Hexagonal Honeycombs with Zero Poisson's Ratios and Enhanced Stiffness
Authors: Grima Joseph N. , Oliveri Ludovica , Attard Daphne , Ellul Brian , Gatt Ruben , Cicala Gianluca , Recca Giuseppe 
Published: September 2010

AbstractIn view of their potential applications in sandwich structures, there has been increasing interest in honeycomb networks. Several different types of honeycomb systems have been proposed each exhibiting different mechanical properties. Here we propose a new hexagonal honeycomb structure composed of two different geometrical features: a re‐entrant feature which is known to generate auxetic behavior, and a non re‐entrant feature found in regular hexagonal honeycombs which leads to conventional behavior. This results in a “semi re‐entrant honeycomb” built of alternate conventional and auxetic layers. Finite element analysis and analytical modeling of these honeycombs show that they exhibit a zero Poisson ratio in one direction and a higher than normal Young's modulus in the orthogonal direction. We also show that by virtue of its zero Poisson's ratio, this honeycomb has a natural tendency to form cylindrical shaped curvatures, something which is very difficult to achieve with conventional or auxetic honeycombs.
Improvement of state profile accuracy in nonlinear dynamic optimization with the quasi‐sequential approach
Authors: Bartl Martin , Li Pu , Biegler Lorenz T. 
Published: September 2010

AbstractQuasi‐sequential methods are efficient and flexible strategies for the solution of dynamic optimization problems. At the heart of these strategies lies the time discretization and approximation of dynamic systems for nonlinear optimization problems. To address this question, we employ a time derivative analysis within the quasi‐sequential approach and derive a finite element placement strategy. In addition, methods for direct error prediction are applied to this approach and extended with a proposed time derivative analysis. According to the information for current time derivatives, subintervals are introduced that improve accuracy of state profiles. Since this is only done in the simulation layer, the nonlinear programing solver need not be restarted. An efficient gradient computation is also derived for these subintervals; the resulting enhanced accuracy accelerates convergence performance and increases the robustness of the solution to initialization. A beer fermentation process case study is presented to demonstrate the effectiveness of the proposed approach. © 2011 American Institute of Chemical Engineers AIChE J, 2011
New sensor network design and retrofit method based on value of information
Authors: Nguyen DuyQuang , Bagajewicz Miguel J. 
Published: September 2010

AbstractTraditionally, the sensor network design procedure was based on positioning sensors so that certain network monitoring capabilities (e.g., observability, redundancy, and error detectability) of key variables are assured at minimum sensors cost. We present a new approach that is based on maximizing economic value of information minus cost instead of the traditional approach that requires the satisfaction of performance targets. This article presents the conceptual aspect and computation issues of this new approach: the connection between the new approach and the traditional minimum‐cost approaches is explored and the computational methods to solve the proposed problem are presented. © 2010 American Institute of Chemical Engineers AIChE J, 2011
Relationship between the lung function and anthropometric measures and indexes in adolescents from Córdoba, Argentina
Authors: Bajo Juan Manuel , Mangeaud Arnaldo 
Published: September 2010

AbstractObjectives: The objectives of this study were to determine the degrees of association between the Forced Vital Capacity (FVC) with four anthropometric variables: height, sitting height, surface, and body volume, and two somatometrics indexes: Body Mass Index (BMI) and Cormic index, and to confront the values of FVC obtained with the predicted ones by the method of Polgar.Methods: One sample of 54 boys and 31 girls was selected. All of them were 11–18 years of age, and were students of the National School of Monserrat (Cordoba, Argentina). The FVC was determined through computerized spirometer and the data were analyzed applying General Linear Models. The values of FVC were confronted with the predicted ones by the method of Polgar.Results: The results indicate the existence of direct relation, with different values from the regression coefficient, between the FVC and the somatometrics variables, with statistically significant differences between sexes. The association of the FVC with the sitting height and the Cormic index demonstrates an increased differential based on sex. The values obtained from FVC in women, similar to those predicted by the method of Polgar; do not occur in masculine sex.Conclusions: we emphasize the observed intersexual difference when we used the Cormic index and sitting height for predicting the FVC; in contrast with the BMI, which has little explanatory power for the FVC. Finally, we also want to emphasize the necessity of counting on local reference tables for spirometric values. Am. J. Hum. Biol., 2010. © 2010 Wiley‐Liss, Inc.
Arbitrary 𝓁‐state solutions of the Klein‐Gordon equation with the Pöschl‐Teller potential
Authors: Koçak G. , Taşkın F. 
Published: September 2010

AbstractWithin the framework of the Klein‐Gordon equation, the relativistic bound states for the Pöschl‐Teller potential are obtained for arbitrary angular momentum quantum numbers by using an approximation for the centrifugal term. The special case for equally scalar and vector Pöschl‐Teller potential is studied. The energy eigenvalues are obtained in closed form and the corresponding normalized radial wave functions are expressed in terms of the generalized hypergeometric functions. The s‐wave (𝓁 = 0) case and bound state conditions are also investigated.
Catalysis of Mononuclear Aquaruthenium Complexes in Oxygen Evolution from Water: A New Radical Coupling Path using Hydroxocerium(IV) Species
Authors: Yoshida Masaki , Masaoka Shigeyuki , Abe Jiro , Sakai Ken 
Published: September 2010

AbstractThe mechanism of O2 evolution from water catalyzed by a series of mononuclear aquaruthenium complexes, [Ru(terpy)(bpy)(OH2)]2+, [Ru(tmtacn)(R2bpy)(OH2)]2+ (R=H, Me, and OMe; R2bpy=4,4′‐disubstituted‐2,2′‐bipyridines), and [Ru(tpzm)(R2bpy)(OH2)]2+ (R=H, Me, and OMe), is investigated, where terpy=2,2′:6′,2′′‐terpyridine, bpy=2,2′‐bipyridine, tmtacn=1,4,7‐trimethyl‐1,4,7‐triazacyclononane, and tpzm=tris(1‐pyrazolyl)methane. The kinetics of O2 evolution is investigated as a function of either the catalyst concentration or the oxidant concentration by employing Ce(NH4)2(NO3)6 as an oxidant; these catalysts can be classified into two groups that have different rate laws for O2 evolution. In one class, the rate of O2 evolution is linear to both the catalyst and Ce4+ concentrations, as briefly reported for [Ru(terpy)(bpy)(OH2)]2+ (S. Masaoka, K. Sakai, Chem. Lett. 2009, 38, 182). For the other class, [Ru(tmtacn)(R2bpy)(OH2)]2+, the rate of O2 evolution is quadratic to the catalyst concentration and independent of the Ce4+ concentration. Moreover, the singlet biradical character of the hydroxocerium(IV) ion was realized by experimental and DFT investigations. These results indicate that the radical coupling between the oxygen atoms of a RuVO species and a hydroxocerium(IV) ion is the key step for the catalysis of [Ru(terpy)(bpy)(OH2)]2+ and [Ru(tpzm)(R2bpy)(OH2)]2+, while the well‐known oxo‐oxo radical coupling among two RuVO species proceeds in the catalysis of [Ru(tmtacn)(R2bpy)(OH2)]2+. This is the first report demonstrating that the radical character provided by the hydroxocerium(IV) ion plays a crucial role in the catalysis of such ruthenium complexes in the evolution of O2 from water.
Confirmation studies of Soviet research on immunological effects of microwaves: Russian immunology results
Authors: Grigoriev Yury G. , Grigoriev Oleg A. , Ivanov Alexander A. , Lyaginskaya Antonina M. , Merkulov Anton V. , Shagina Natalia B. , Maltsev Vyacheslav N. , Lévêque Philippe , Ulanova Alla M. , Osipov Vyacheslav A. , Shafirkin Alexander V. 
Published: September 2010

AbstractThis paper presents the results of a replication study performed to investigate earlier Soviet studies conducted between 1974 and 1991 that showed immunological and reproductive effects of long‐term low‐level exposure of rats to radiofrequency (RF) electromagnetic fields. The early studies were used, in part, for developing exposure standards for the USSR population and thus it was necessary to confirm the Russian findings. In the present study, the conditions of RF exposure were made as similar as possible to those in the earlier experiments: Wistar rats were exposed in the far field to 2450 MHz continuous wave RF fields with an incident power density in the cages of 5 W/m2 for 7 h/day, 5 days/week for a total of 30 days, resulting in a whole‐body SAR of 0.16 W/kg. Effects of the exposure on immunological parameters in the brain and liver of rats were evaluated using the complement fixation test (CFT), as in the original studies, and an additional test, the more modern ELISA test. Our results, using CFT and ELISA, partly confirmed the findings of the early studies and indicated possible effects from non‐thermal RF exposure on autoimmune processes. The RF exposure resulted in minor increases in formation of antibodies in brain tissue extract and the exposure did not appear to be pathological. In addition, a study was conducted to replicate a previous Soviet study on effects from the injection of blood serum from RF‐exposed rats on pregnancy and foetal and offspring development of rats, using a similar animal model and protocol. Our results showed the same general trends as the earlier study, suggesting possible adverse effects of the blood serum from exposed rats on pregnancy and foetal development of intact rats, however, application of these results in developing exposure standards is limited. Bioelectromagnetics 31:589–602, 2010. © 2010 Wiley‐Liss, Inc.
Sleep after mobile phone exposure in subjects with mobile phone‐related symptoms
Authors: Lowden Arne , Åkerstedt Torbjörn , Ingre Michael , Wiholm Clairy , Hillert Lena , Kuster Niels , Nilsson Jens P , Arnetz Bengt 
Published: September 2010

AbstractSeveral studies show increases in activity for certain frequency bands (10–14 Hz) and visually scored parameters during sleep after exposure to radiofrequency electromagnetic fields. A shortened REM latency has also been reported. We investigated the effects of a double‐blind radiofrequency exposure (884 MHz, GSM signaling standard including non‐DTX and DTX mode, time‐averaged 10 g psSAR of 1.4 W/kg) on self‐evaluated sleepiness and objective EEG measures during sleep. Forty‐eight subjects (mean age 28 years) underwent 3 h of controlled exposure (7:30–10:30 PM; active or sham) prior to sleep, followed by a full‐night polysomnographic recording in a sleep laboratory. The results demonstrated that following exposure, time in Stages 3 and 4 sleep (SWS, slow‐wave sleep) decreased by 9.5 min (12%) out of a total of 78.6 min, and time in Stage 2 sleep increased by 8.3 min (4%) out of a total of 196.3 min compared to sham. The latency to Stage 3 sleep was also prolonged by 4.8 min after exposure. Power density analysis indicated an enhanced activation in the frequency ranges 0.5–1.5 and 5.75–10.5 Hz during the first 30 min of Stage 2 sleep, with 7.5–11.75 Hz being elevated within the first hour of Stage 2 sleep, and bands 4.75–8.25 Hz elevated during the second hour of Stage 2 sleep. No pronounced power changes were observed in SWS or for the third hour of scored Stage 2 sleep. No differences were found between controls and subjects with prior complaints of mobile phone‐related symptoms. The results confirm previous findings that RF exposure increased the EEG alpha range in the sleep EEG, and indicated moderate impairment of SWS. Furthermore, reported differences in sensitivity to mobile phone use were not reflected in sleep parameters. Bioelectromagnetics 32:4–14, 2011. © 2010 Wiley‐Liss, Inc.
Determination of subnanomolar concentrations of vanadium in environmental water samples using flow injection with luminol chemiluminescence detection
Authors: Attiq‐ur‐Rehman  , Yaqoob Mohammad , Waseem Amir , Nabi Abdul 
Published: September 2010

ABSTRACTA flow injection chemiluminescence method is described for the determination of subnanomolar concentrations of vanadium in environmental water samples. The procedure is based on the oxidation of luminol in the presence of dissolved oxygen catalyzed by vanadium(IV). Vanadium(V) reduction and preconcentration of vanadium(IV) was carried out using in‐line silver reductor and 8‐hydroxyquinoline chelating columns at pH 3.15, respectively. The calibration graph for vanadium(IV) was linear in the concentration range of 0.025–10 µg/L with relative standard deviation in the range of 0.4–5.58%. The detection limit (3s blank) was 3.8 × 10−3 µg/L without preconcentration; when the vanadium(IV) was preconcentrated with an 8‐HQ column for 1 min (2.0 mL of sample loaded), the detection limit of 5.1 × 10−4 µg/L was achieved. One analytical cycle can be completed in 2.0 min. The analysis of certified reference materials (CASS‐4, NASS‐5 and SLRS‐4) by the proposed method showed good agreement with the certified values. The method was successfully applied to the determination of total dissolved vanadium in environmental water samples. Copyright © 2010 John Wiley & Sons, Ltd.