bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of compact dual‐band chip antenna for WLAN/UWB applications
Authors: Park Sang Yong , Park Jong Kweon 
Published: February 2011

AbstractThis article describes a compact dual‐band chip antenna using folded‐loop metal pattern structure for WLAN/UWB applications.The folded‐loop metal pattern is embedded on the Taconic CER10 substrate to achieve a compact structure and two operating bands of WLAN and UWB. The proposed dual‐band chip antenna occupies a compact area of 6 × 6 mm and shows a low profile of 1 mm when mounted on the system circuit board of the mobile phone, making it suitable for thin mobile phone applications. Details of the proposed design are described and experimental results of the constructed prototype are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:904–910, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25886
Slim wrapped inverted‐F antenna for GSM/DCS/PCS operation
Authors: Razali Ahmad R. , Bialkowski Marek E. 
Published: February 2011

AbstractIn this letter, the design of a super slim multiband wrapped inverted‐F antenna that covers the frequency bands allocated for GSM, DCS, and PCS wireless services is described. In the first step, the quarter‐wavelength (at 850 MHz) open‐end arm of an inverted‐F radiator is folded and meandered. Then, the antenna is wrapped using a fourth‐order folding technique to reduce its projection area to only 40 mm × 10 mm × 3 mm. Full wave electromagnetic (EM) simulations show that the antenna excites a lower mode resonance at ∼850 MHz and a higher one at about 1900 MHz. Its radiation pattern is nearly omni‐directional with a gain of about 2.5 dBi at the lower band and 4.6 dBi at the upper band. A prototype of the proposed antenna is fabricated and tested. A close agreement between the simulated and measured results is achieved. The measured 6‐dB return loss or voltage standing wave ratio (VSWR) 3:1 bandwidths for the lower and upper resonances is 200 MHz (770–970 MHz) and 280 MHz (1710–1990 MHz), respectively. These bandwidths are sufficient to cover GSM 850/900/1800/1900 MHz, DCS 1800 MHz, and PCS 1900 MHz bands. Because of its small volume, the proposed antenna is a very attractive candidate for modern slim portable transceivers. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:900–904, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25887
A V‐band CMOS sub‐harmonic mixer with integrated frequency doubler and 180° out‐of‐phase splitter
Authors: Lee Jen‐How , Chen Chi‐Chen , Lin Yo‐Sheng 
Published: February 2011

AbstractA V‐band sub‐harmonic mixer with an integrated frequency doubler and a 180° out‐of‐phase splitter using standard 0.13 μm CMOS technology is reported. The sub‐harmonic mixer comprises a current‐reused bleeding mixer, a baseband amplifier, a 180° (Wilkinson‐power‐divider‐based) out‐of‐phase splitter, and a frequency doubler. The mixer consumed 31.5 mW and achieved input return loss at RF port better than −10 dB for frequencies from 49.8 to 63 GHz. At IF of 20 MHz, the mixer achieved maximum conversion gain of 9.5 dB at RF of 53 GHz. The corresponding 3‐dB bandwidth (ω3dB) of RF is 9.6 GHz (48.4–58 GHz). The measured LO‐to‐RF and LO‐to‐IF isolation were better than 50 dB over the frequency band of interest. In addition, the measured input 1‐dB compression point (P1dB) and input third‐order intermodulation point were −8 dBm and 2.2 dBm, respectively, at RF of 60 GHz. These results demonstrate the proposed mixer architecture is very promising for high‐performance V‐band RFIC applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:870–875, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25888
Flame retardancy of polyamide 66 nanocomposites with thermally stable organoclay
Authors: Sheng Feifei , Tang Xiu‐Zhi , Zhang Sheng , Ding Xuejia , Yu Zhong‐Zhen , Qiu Zhaobin 
Published: February 2011

AbstractA thermally stable imidazolium organoclay was synthesized to improve the flame retardancy performance of polyamide 66 (PA 66). To enhance flame retardancy of the PA 66/organoclay nanocomposite, the thermally stable organoclay was coated with monomethylol melamine (MMM) before melt‐compounding with PA 66. Transmission electron microscopy and X‐ray diffraction results confirmed the partial exfoliation of the organoclay in the PA 66 matrix. The use of the thermally stable organoclay did not affect the thermal stability of PA 66. The cone calorimeter results showed that the PA 66/orgnaoclay nanocomposite exhibited a greatly reduced heat release rate and a longer ignition time. However, the PA 66/organoclay binary nanocomposite had no rating in the UL‐94 vertical burning test because it did not extinguish until the entire polymer component was burnt. The PA 66 nanocomposite with 15 wt% of MMM‐coated organoclay performed better in the ignition resistance test than the PA 66/organoclay nanocomposite containing 15 wt% of melamine. Copyright © 2011 John Wiley & Sons, Ltd.
Tunnel current through virus particles between columnar structures in mesoporous silicon
Authors: Vashpanov Yuriy , Jung Jae‐Il , Dal Kwack Kae 
Published: February 2011

AbstractEarlier we reported on a tunnel charge transport mechanism in mesoporous silicon with columnar structures under adsorption of plant nematode‐transmitted polyhedral (NEPO) viruses at room temperature. Additional experiments are performed in this paper to establish that this observed tunnel current is connected to a conduction path through virus particles. The plant NEPO viruses have an orbicular shape with a diameter of around 25–30 nm. This size is matched well to the porous size distribution in manufactured samples. The tunnel charge transport in semiconductor structures was not observed on loading protein macromolecules of smaller sizes. A physical mechanism of the observed phenomena can be interpreted to be the result of a shunting effect through virus particles between the two closely located columnar silicon structures. This effect is likely to result from double points at virus adsorption under the condition of matching of pore and virus sizes. The magnitudes of the tunnel barrier heights depend on the type of loaded plant viruses. The investigated columnar structures of mesoporous silicon can be used for research on the electrical properties of different viruses with corresponding sizes in the range of 20–30 nm. The existence of a tunnel current between columnar structures in mesoporous silicon under virus adsorption can be used as a simple method for their detection in the environment.
A facile approach for decorating quantum dots deep inside of anodically grown self‐organized TiO2 nanotubes
Authors: Shrestha Nabeen K. , Yoon Seog Joon , Lee Deok Yeon , Lee Misun , Lim Iseul , Sung MyungMo , Ahn Heejoon , Han Sung‐Hwan 
Published: February 2011

AbstractWe demonstrate here a simple but very effective approach to decorate anodically grown TiO2 nanotubes (NTs) uniformly with CdS and PbS quantum dots (QDs) deep inside the NT walls. This approach is based on SILAR (successive ionic layer adsorption and reaction) technique assisted with evacuation of the NTs. The basic idea of evacuation is to remove air pockets trapped inside the NTs so as to clear the passage for the penetration of QD precursors down the bottom of the NTs.magnified image(© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Comparison of two populations of curves with an application in neuronal data analysis
Authors: Behseta Sam , Chenouri Shojaeddin 
Published: February 2011

AbstractOften in neurophysiological studies, scientists are interested in testing hypotheses regarding the equality of the overall intensity functions of a group of neurons when recorded under two different experimental conditions. In this paper, we consider such a hypothesis testing problem. We propose two test statistics: a parametric test similar to the modified Hotelling's T2 statistic of Behseta and Kass (Statist. Med. 2005; 24:3523–3534), as well as a nonparametric one similar to the spatial signed‐rank test statistic of Möttönen and Oja (J. Nonparametric Statist. 1995; 5:201–213). We implement these tests on smooth curves obtained via fitting Bayesian Adaptive Regression Splines (BARS) to the intensity functions of neuronal Peri‐Stimulus Time Histograms. Through simulation, we show that the powers of our proposed tests are extremely high even when the number of sampled neurons and the number of trials per neuron are small. Finally, we apply our methods on a group of motor cortex neurons recorded during a reaching task. Copyright © 2011 John Wiley & Sons, Ltd.
Formalizing interactive staged feature model configuration
Authors: Bagheri Ebrahim , Noia Tommaso Di , Gasevic Dragan , Ragone Azzurra 
Published: February 2011

SUMMARYFeature modeling an attractive technique for capturing commonality as well as variability within an application domain for generative programming and software product line engineering. Feature models symbolize an overarching representation of the possible application configuration space, and can hence be customized based on specific domain requirements and stakeholder goals. Most interactive or semi‐automated feature model customization processes neglect the need to have a holistic approach towards the integration and satisfaction of the stakeholder's soft and hard constraints, and the application‐domain integrity constraints. In this paper, we will show how the structure and constraints of a feature model can be modeled uniformly through Propositional Logic extended with concrete domains, called Pscr(𝒩). Furthermore, we formalize the representation of soft constraints in fuzzy 𝒫(𝒩) and explain how semi‐automated feature model customization is performed in this setting. The model configuration derivation process that we propose respects the soundness and completeness properties. Copyright © 2011 John Wiley & Sons, Ltd.
EDXRF analysis of metal artefacts from the grave goods of the Royal Tomb 14 of Sipán, Peru
Authors: Galli A. , Bonizzoni L. , Sibilia E. , Martini M. 
Published: February 2011

AbstractSeveral metallic sheets (about 1 mm thick) from the grave goods of the Royal Tomb 14 (Sipán, Peru) were characterised by energy dispersive X‐ray fluorescence analysis, using both a portable instrument and a capillary collimated spectrometer to investigate details, and micro‐Raman spectroscopy. The samples, belonging to the clothing of the warrior priest, resulted composed of thin copper sheets or tumbaga (natural alloy of copper, silver and gold). They were unearthed covered with typical green patina, formed during their long burial and characterised mainly by copper minerals, such as malachite, atacamite and magnetite identified with micro‐Raman spectroscopy. Due to deterioration of the original alloy, the artefacts analyzed in this work were rather fragile and could not resist hard polishing aimed at cleaning off corrosion products. So a non‐destructive qualitative EDXRF analysis was performed to identify the elemental composition of the metal alloy and a quantitative estimation was made applying the fundamental parameter method. The presence of superficial patina layer and the non‐homogeneous composition was also taken into account during calculation. The data obtained, compared to published results from several artefacts found in the nearby tombs, have been treated with a hierarchical statistic analysis. Copyright © 2011 John Wiley & Sons, Ltd.
ED‐XRF set‐up for size‐segregated aerosol samples analysis
Authors: Bernardoni Vera , Cuccia Eleonora , Calzolai Giulia , Chiari Massimo , Lucarelli Franco , Massabò Dario , Nava Silvia , Prati Paolo , Valli Gianluigi , Vecchi Roberta 
Published: February 2011

AbstractThe knowledge of size‐segregated elemental concentrations in atmospheric particulate matter (PM) gives a useful contribution to the complete chemical characterisation; this information can be obtained by sampling with multi‐stage cascade impactors. In this work, samples were collected using a low‐pressure 12‐stage Small Deposit Impactor and a 13‐stage rotating Micro Orifice Uniform Deposit Impactor™. Both impactors collect the aerosol in an inhomogeneous geometry, which needs a special set‐up for X‐ray analysis. This work aims at setting up an energy dispersive X‐ray fluorescence (ED‐XRF) spectrometer to analyse quantitatively size‐segregated samples obtained by these impactors. The analysis of cascade impactor samples by ED‐XRF is not customary; therefore, as additional consistency test some samples were analysed also by particle‐induced X‐ray emission (PIXE), which is more frequently applied to size‐segregated samples characterised by small PM quantities. A very good agreement between ED‐XRF and PIXE results was obtained for all the detected elements in samples collected with both impactors. The good inter‐comparability proves that our methodology is reliable for analysing size‐segregated samples by ED‐XRF technique. The advantage of this approach is that ED‐XRF is cheaper, easier to use, and more widespread than PIXE, thus promoting an intensive use of multi‐stage impactors. Copyright © 2011 John Wiley & Sons, Ltd.
Homogenization of a generalization of Brinkman's equation for the flow of a fluid with pressure dependent viscosity through a rigid porous solid
Authors: Savatorova V.L. , Rajagopal K.R. 
Published: February 2011

AbstractIn this paper we consider a generalization of Brinkman's equation governing the flow of an incompressible fluid through a porous medium to take into account the variation of the viscosity with the pressure. There is overwhelming evidence that the viscosity depends on pressure and that this dependence is exponential. We also consider the problem of a barotropic fluid in which both the viscosity and the density depend upon the pressure. We use a homogenization procedure, that exploits a multiple scale structure possessed by a solid porous medium, a `micro‐scale' comparable to the pore size and a `macro‐scale' associated with the global size of the body, to carry out a multiple‐scale asymptotic analysis. The ratio of the micro‐scale length to the macro‐scale length provides a small parameter that is a natural parameter with which to carry out a perturbation analysis. The perturbation procedure leads to a systematic methodology by means of which we can obtain equations at different orders of the small parameter. Specifically, we study some simple boundary value problems corresponding to one‐dimensional flows. We find that while the dependence of the viscosity on the pressure can have a significant effect on the nature of the solution, so much so that the solution is completely different in comparison to the constant viscosity case Brinkman's equation, we find that the dependence of the density on the pressure has little or no effect on the nature of the solution.
Extraction of Fatty Acids from Boletus edulis by Subcritical and Supercritical Carbon Dioxide
Authors: Vidović Senka , Mujić Ibrahim , Zeković Zoran , Lepojević Žika , Milošević Svetlana , Jokić Stela 
Published: February 2011

AbstractMushrooms contain many valuable compounds such as fatty acids, carbohydrates, lycopene, lovastatin, trace elements etc. As they are currently valued for biologically active substances, and as high pressure carbon dioxide fluid extraction has been documented as an effective method for preparing bioactive products from plant materials, subcritical and supercritical carbon dioxide extraction of Boletus edulis mushroom was performed. In the extracts obtained, the fatty acids were determined. Response surface methodology (RSM) was applied to investigate the effect of pressure and extraction time on the extraction yield. The analysis of variance showed that pressure and extraction time had a significant effect on the extraction yield in both investigated process. The interaction between pressure and extraction time had a significant effect only in supercritical extraction process of B. edulis. Higher extraction yields have been obtained by subcritical carbon dioxide, and higher linoleic acid content has been determined in extracts obtained by supercritical carbon dioxide.
Pregabalin for the discontinuation of long-term benzodiazepines use: An assessment of its effectiveness in daily clinical practice
Authors: Bobes J. , Rubio G. , Terán A. , Cervera G. , López-Gómez V. , Vilardaga I. , Pérez M. 
Published: February 2011

AbstractPurposeTo evaluate the effectiveness and tolerability of pregabalin in the management of the discontinuation of benzodiazepines in long-term users.Subjects and methodsWe performed a 12-week, prospective, uncontrolled, non-interventional, and observational study in patients aged 18 years old or above, who met DSM-IV-TR criteria for benzodiazepine dependence without other major psychiatry disorder. Evaluations included the Benzodiazepine Withdrawal Symptom Questionnaire, the Hamilton Anxiety Rating Scale, the Clinical Global Impression Scale, and the Sheehan Disability Scale. A urine drug screen for benzodiazepines was performed at baseline and every 4 weeks thereafter. The primary effectiveness variable was success rate, defined as achievement of benzodiazepine-free status at week 12 according to the urine drug screen.Results and discussionThe mean dose at week 12 was 315 (±166) mg/day. The success rate of the benzodiazepine taper in the primary efficacy population (n = 282) was 52% (95% confidence interval [CI], 46–58). Success rates for women and men were 58% (95% CI, 49–67) and 46% (95% CI, 38–55), respectively. The success rates did not differ according to either the benzodiazepine of abuse or the presence of other substance use disorders. Significant and clinically relevant improvements were observed in withdrawal and anxiety symptoms, as well as in patients’ functioning. At week 12, tolerability was rated as good or excellent by 90% and 83% of the clinicians and patients, respectively.ConclusionOur results suggest that pregabalin is an efficacious and well-tolerated adjunctive treatment for benzodiazepine withdrawal.
Psychotic-like experiences and depressive symptoms in a community sample of adolescents
Authors: Barragan M. , Laurens K.R. , Navarro J.B. , Obiols J.E. 
Published: February 2011

AbstractPurposeStudies of psychotic-like experiences (PLEs) within community samples of adolescents have explored predominantly positive experiences. There is a paucity of research examining the prevalence and correlates of negative PLEs, and whether particular subtypes of negative PLEs can be identified among the general population of adolescents. This study examined the association of both positive and negative PLEs with depressive symptoms, including detailed analysis of subtypes of positive and negative psychosis dimensions.MethodA community sample of 777 adolescents (50.9% girls: mean age 14.4 years) completed a questionnaire assessing positive and negative PLEs and depressive symptoms.ResultsPrincipal component factor analysis identified four factors of positive symptoms (persecutory ideation, grandiose thinking, first-rank/hallucinatory experiences and self-referential thinking), and three factors of negative symptoms (social withdrawal, affective flattening, and avolition). Depressive symptoms were associated positively with persecutory ideation, first-rank/hallucinatory experiences, social withdrawal, and avolition, whereas grandiose thinking related negatively with depressive symptoms. Neither self-referential thinking nor affective flattening related to self-reported depression.ConclusionsThese findings support the view that not all types of positive and negative PLEs in adolescence are associated with depression and, therefore, they may not confer the same vulnerability for psychotic disorders.
Protein and fat modify the glycaemic and insulinaemic responses to a mashed potato-based meal
Authors: Hätönen Katja A. , Virtamo Jarmo , Eriksson Johan G. , Sinkko Harri K. , Sundvall Jouko E. , Valsta Liisa M. 
Published: February 2011

Potatoes, especially mashed potatoes, are known to result in high glycaemic and insulinaemic responses. However, in most meals, potatoes are accompanied by other foods. The objective of the present study was to investigate how glycaemic and insulinaemic responses to a mashed potato meal changed when a high-fat food (rapeseed oil), a high-protein food (chicken breast) and/or salad were added to the meal. Healthy subjects (n11) ingested the test meals once and the reference food (glucose solution) twice in a random order at 1-week intervals. Capillary blood samples were then drawn for 2 h, and glucose and insulin were analysed. The 2 h glycaemic responses to six mashed potato-containing meals varied more than twofold. The glycaemic index (GI) of pure mashed potato was 108, whereas combined with chicken breast, rapeseed oil and salad, it was only 54. The latter GI also differed considerably from its predicted value of 103, which was based on the individual GI of the components of the meal. The insulinaemic indices of the mashed potato-based meals varied between 94 and 148. Chicken breast in the meal increased the insulinaemic response, and rapeseed oil diminished it. However, the insulinaemic response to mashed potato with chicken breast and rapeseed oil was lower than that to mashed potato alone. In conclusion, the protein, fat and salad contents of a meal exert considerable influence on the glycaemic and insulinaemic responses to mashed potatoes. Furthermore, the estimation of the GI of a mixed meal by calculation is imprecise.
A global event with a regional character: the Early Toarcian Oceanic Anoxic Event in the Pindos Ocean (northern Peloponnese, Greece)
Authors: KAFOUSIA N. , KARAKITSIOS V. , JENKYNS H. C. , MATTIOLI E. 
Published: February 2011

AbstractThe Early Toarcian (Early Jurassic, c. 183 Ma) was characterized by an Oceanic Anoxic Event (T-OAE), primarily identified by the presence of globally distributed approximately coeval black organic-rich shales. This event corresponded with relatively high marine temperatures, mass extinction, and both positive and negative carbon-isotope excursions. Because most studies of the T-OAE have taken place in northern European and Tethyan palaeogeographic domains, there is considerable controversy as to the regional or global character of this event. Here, we present the first high-resolution integrated chemostratigraphic (carbonate, organic carbon, δ13Ccarb, δ13Corg) and biostratigraphic (calcareous nannofossil) records from the Kastelli Pelites cropping out in the Pindos Zone, western Greece. During the Mesozoic, the Pindos Zone was a deep-sea ocean-margin basin, which formed in mid-Triassic times along the northeast passive margin of Apulia. In two sections through the Kastelli Pelites, the chemostratigraphic and biostratigraphic (nannofossil) signatures of the most organic-rich facies are identified as correlative with the Lower Toarcian, tenuicostatum/polymorphum–falciferum/serpentinum/levisoni ammonite zones, indicating that these sediments record the T-OAE. Both sections also display the characteristic negative carbon-isotope excursion in organic matter and carbonate. This occurrence reinforces the global significance of the Early Toarcian Oceanic Anoxic Event.