bluuebunny/crossref_metadata_2025_split huggingface dataset:
Miniaturized WLAN Antenna in Mobile Handset with Wide Impedance Bandwidth Characteristic
Authors: Lee Jaesuk , Kim Hyeongdong 
Published: October 2015

ABSTRACTTwo enhancements, size reduction and impedance bandwidth improvement, for a multiband antenna for mobile handsets are presented. The size of the designed antenna can be significantly reduced by inserting chip inductors, whereas the impedance bandwidth can be enhanced with a chip capacitor. Measurements demonstrate that the proposed antenna possesses frequencies of 130 MHz (2.39–2.52 GHz) and 1.3 GHz (5.06–6.36 GHz) with a voltage standing wave ratio of 2. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2841–2844, 2013
Dual Band LTE Planar Inverted‐F Antenna for M2m Applications
Authors: Loutrids Abraham , John Matthias , Ammann Max J. 
Published: October 2015

ABSTRACTA Planar Inverted‐F Antenna for M2M applications is presented. The antenna is located on a rectangular ground plane and operates across both long term evolution frequency bands (690–960 MHz) and (1710–2690 MHz). The low cost antenna has omnidirectional characteristics. The efficiency is better than 80% in both bands and the average gain is more than −2.1 dBi across the whole frequency range. A parametric study of key geometrical parameters is reported. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2925–2929, 2013
High Selective Bandpass Filter Using Inductive‐Coupled Quarter‐Wavelength Stepped‐Impedance Resonators
Authors: Cheng Fei , Lin Xianqi , Hu Yiyao , Liu Xiaoxiao , Song Kaijun , Fan Yong 
Published: October 2015

ABSTRACTA compact microstrip bandpass filter with reduced size and high selectivity is proposed. The inductive‐coupled quarter‐wavelength resonators are studied and used to produce transmission zeros. In addition, quarter‐wavelength stepped‐impedance resonators are adopted to reduce the size of the filter and also to raise the spurious frequency. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:3010–3014, 2013
Two‐Patch‐PIFA System with Comparable Polarization Radiation for Tablet‐Computer Applications with Complete, Metal Back Cover
Authors: Su Saou‐Wen 
Published: October 2015

ABSTRACTA two‐patch‐planar inverted‐F antenna (PIFA) system well suited to functioning inside the tablet computer with a complete, metal back cover for 2.4‐GHz wireless local area network operation is proposed. The antenna was constructed by stamping a flat plate of size 23 × 30 mm2 and bent two times to form a compact structure with dimensions 5 × 9 × 30 mm3. The PIFA was fed and short‐circuited at the top patch above the antenna ground with a vertical ground wall connecting therebetween. The two PIFAs were symmetrically located on the metal cover and grounded therein. The results showed that comparable Eθ and Eφ fields of the antennas were obtained for the tablet computer used in the three major positions, namely landscape, portrait, and bottom‐down modes. The correlation and the diversity gain of the two‐PIFA system were also measured. The operating principle and details of the design prototypes are described and discussed in the article. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2815–2821, 2013
A Compact UWB Antenna With Dual Band‐Notch Characteristics Using Nested Split Ring Resonator and Stepped Impedance Resonator
Authors: Li Yingsong , Li Wenxing , Ye Qiubo 
Published: October 2015

ABSTRACTIn this article, a wide‐slot ultrawideband antenna with dual band‐notch characteristics is proposed numerically and verified experimentally. The dual band‐notch functions are obtained by using a nested split ring resonator (NSRR) and a stepped impedance resonator (SIR). The designed two notch bands are tunable by adjusting the dimension of the NSRR and the SIR. Simulation and measurement results agree well. The proposed antenna with omnidirectional radiation patterns and desired notch bands is suitable for UWB communication applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2827–2830, 2013
CPW‐Fed Printed Antenna Design with Multislit Patches for UWB Communications
Authors: Zhan Jie , Tang Zhi‐Jun , Wu Xiao‐Feng , Liu Hong‐Li 
Published: October 2015

ABSTRACTA novel compact coplanar waveguide‐fed printed antenna with three separate patches embedded by narrow slits is designed and analyzed for ultrawideband (UWB) communication applications, which can provide UWB, high gain, and multiresonant impedance characteristics simultaneously. The dimension of the proposed antenna is 50 × 50 × 0.3 mm3. The measured results agree well with the simulated prediction and show a broad bandwidth of 13 GHz ranging from 2.8 to 15.8 GHz with return loss less than −10dB. Furthermore, the proposed antenna gain ranges from 4.3 to 8.2dBi, which can achieve almost symmetrical radiation patterns. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:3023–3025, 2013
Stripline Bandpass Filter with Wide Stopband and Rejection Level Up to 100 dB
Authors: Belyaev B.A. , Serzhantov A.M. , Tyurnev V.V. , Leksikov A.A. , Bal'va Y.F. 
Published: October 2015

ABSTRACTA novel miniature stripline resonator performed on a double‐layer suspended substrate and bandpass filters (BPFs) based on it are proposed. The filters have wide stopband with high attenuation. A fifth‐order BPF has been designed and fabricated. The filter stopband at level of −100 dB extends up to the frequency that exceeds the passband center frequency by factor of 10. It is shown that miniature filters based on the proposed resonator could be effectively fabricated by low temperature cofired ceramics technology. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2866–2869, 2013
Polymere Multitalente: sternförmige Polykationen
Authors: Synatschke Christopher V. , Plamper Felix A. , Müller Axel H. E. 
Published: October 2015

AbstractIhre besondere Struktur verleiht sternförmigen Polymermolekülen außergewöhnliche Eigenschaften. Geladene Sternpolymere reagieren auf äußere Einflüsse wie pH‐Wert, Temperatur oder Licht und eignen sich gerade für Anwendungen in der Biomedizin.
Fetal intracranial translucency and cisterna magna at 11 to 14 weeks: reference ranges and correlation with chromosomal abnormalities
Authors: Papastefanou I. , Souka A. P. , Pilalis A. , Panagopoulos P. , Kassanos D. 
Published: October 2015

ObjectiveTo measure the intracranial translucency (IT) and the cisterna magna (CM), to produce reference ranges and to examine the interobserver and intraobserver variability of those measurements. To examine the possible association of IT with chromosomal abnormalities.MethodsProspective study on pregnancies assessed at 11 to 14 weeks. IT was measured retrospectively in 17 cases with aneuploidy.ResultsTo produce reference ranges, 465 fetuses were used. IT and CM correlated linearly with crown‐rump‐length (CRL) and were independent of maternal demographic characteristics and biochemical indices. IT had a weak positive correlation with nuchal translucency. For IT the intraclass correlation coefficient was 0.88 for intraobserver variability and 0.83 for interobserver variability. For CM the intraclass correlation coefficient was 0.95 for intraobserver variability and 0.84 for interobserver variability. The IT multiple of the median was significantly increased in the chromosomally abnormal fetuses (1.02 for the normal and 1.28 for the chromosomally abnormal fetuses, Mann Whitney p < 0.001). IT multiple of the median was a significant predictor of chromosomal abnormality (Receiver Operator Characteristic curve analysis: Area under the curve = 0.86, CI=0.76–0.96, p<0.001).ConclusionIntracranial translucency and CM can be measured reliably at the 11 to 14 weeks examination and the measurements are highly reproducible. IT appears to be increased in fetuses with chromosomal abnormalities. Copyright © 2011 John Wiley & Sons, Ltd.
Correlation of Activation Energies of Gas Diffusivity and Local Matrix Mobility in Polycarbonate/POSS Nanocomposites
Authors: Böhning Martin , Hao Ning , Schönhals Andreas 
Published: October 2015

ABSTRACTAccording to basic phenomenological models describing the solution‐diffusion based mechanism of penetrant diffusion in dense polymers, a connection between the diffusive transport of gas molecules in a polymeric matrix and the molecular mobility of that matrix on a certain length scale is, in principle, established for a long time. However, experimental data directly showing this correlation are rare. The investigation of a series of nanocomposites based on a polyhedral oligomeric silsesquioxane (POSS) and a polycarbonate matrix allows a systematic change of the molecular mobility on a local length scale (β‐relaxation) and of the corresponding activation energy EA, both determined by broadband dielectric spectroscopy. Independently, activation energies of penetrant diffusion (ED) of these nanocomposites were determined for N2, O2, CO2, and CH4 and a clear linear correlation between the two activation energies was established for the first time. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 1593–1597
4,5‐Bis(5‐tetrazolyl)‐1,2,3‐triazole: Synthesis and Performance
Authors: Du Zhiming , Zhang Yinghao , Han Zhiyue , Yao Qian 
Published: October 2015

Abstract4,5‐Bis(5‐tetrazolyl)‐1,2,3‐triazole (BTT) was synthesized by a new method. Its structure was characterized by IR and 13C NMR spectroscopy and elemental analysis (EA). The thermal stability of BTT was investigated by TG‐DSC technique. The kinetic parameters including activation energy and pro‐exponential factor were calculated by Kissinger equation. The combustion heat, detonation products, hygroscopicity, impact, and friction sensitivity were also measured. The formation heat, detonation pressure, and detonation velocity of BTT were calculated. BTT has high detonation pressure and detonation velocity (P=35.36 GPa, D=8.971 km s−1). BTT has potential application prospect as environmentally friendly gas generant, insensitive explosive and solid propellant.
How well does the ‘counter‐urbanisation story’ travel to other countries? the case of Norway
Authors: Grimsrud Gro Marit 
Published: October 2015

ABSTRACTThe predominant theories in rural population research are largely rooted in counter‐urbanisation contexts, and it seems that the academic and political thinking about rurality is influenced by these ideas in countries beyond those actually experiencing counter‐urbanisation. One outcome of this research is the construction of rural in‐migration as mainly related to a desire for a rural lifestyle. This paper illustrates in two ways that such representations are not suitable for understanding migration into rural Norway. Firstly, longitudinal data confirm that urban–rural migrations do not increase but encompass a minimal and steady share of the rural population. Secondly, survey data suggest that rural in‐migrants are more likely to be motivated by family relations and economic concerns than that by anti‐urban preferences for rural living. Migrants moving into the metropolitan fringes, however, are better fit for the motivation structure indicated by the prevailing models of counter‐urbanisation. Thus, the paper adds further context to the largely British counter‐urbanisation narrative and cautions researchers of population change in remote rural areas about using conceptualisations originating in the core regions of Europe and America.
Structural determination by atmospheric pressure photoionization tandem mass spectrometry of some compounds isolated from the SARA fractions obtained from bitumen
Authors: Tachon Nadine , Jahouh Farid , Delmas Michel , Banoub Joseph H. 
Published: October 2015

We have identified compounds obtained from the SARA fractions of bitumen by using atmospheric pressure photoionization mass spectrometry and low‐energy collision tandem mass spectrometric analyses with a QqToF‐MS/MS hybrid instrument. The identified compounds were isolated from the maltene saturated oil and the aromatic fractions of the SARA components of a bitumen. The QqToF instrument had sufficient mass resolution to provide accurate molecular weight information and to enhance the tandem mass spectrometry results. The APPI‐QqToF‐MS analysis of the separated compounds showed a series of protonated molecules [M + H]+ and molecular ions [M]+▪ of the same mass but having different chemical structures, in the maltene saturated oil and the aromatic SARA fractions. These isobaric ions were a molecular ion [M2]+▪ at m/z 418.2787 and a protonated molecule [M5 + H]+ at m/z 287.1625 in the saturated oil fraction, and molecular ions [M6]+▪ at m/z 418.1584 and [M7]+▪ at m/z 287.1285 in the aromatic fraction.The identification of this series of chemical compounds was achieved by performing CID‐MS/MS analyses of the molecular ions [M]+▪ ([M1]+▪ at m/z 446. 2980, [M2]+▪ at m/z 418.2787, [M3]+▪ at m/z 360.3350 and [M4]+▪ at m/z 346.2095) in the saturated oil fraction and of the [M5 + H]+ ion at m/z 287.1625 also in the saturated oil fraction. The observed CID‐MS/MS fragmentation differences were explained by proposed different breakdown processes of the precursor ions. The presented tandem mass spectrometric study shows the capability of MS/MS experiments to differentiate between different classes of chemical compounds of the SARA components of bitumen and to explain the reasons for the observed mass spectrometric differences. However, greater mass resolution than that provided by the QqToF‐MS/MS instrument would be required for the analysis of the asphaltene fraction of bitumen. Copyright © 2011 John Wiley & Sons, Ltd.
Online methodology for determining compound‐specific hydrogen stable isotope ratios of trichloroethene and 1,2‐cis‐dichloroethene by continuous‐flow isotope ratio mass spectrometry
Authors: Shouakar‐Stash Orfan , Drimmie Robert J. 
Published: October 2015

RATIONALECarbon and chlorine compound‐specific isotope analysis (CSIA) is utilized in chlorinated solvent contamination studies of soil and groundwater contaminated sites. However, in field studies, hydrogen CSIA has been used only in non‐chlorinated volatile organic compound (VOC) investigations, due to low conversion yields into hydrogen gas and poor reproducibility. Therefore, it is important to develop hydrogen CSIA methodology for soil and subsurface contamination studies.METHODSA new analytical method for determining compound‐specific hydrogen stable isotope ratios is presented. The isotopic ratios were measured by gas chromatography/isotope ratio mass spectrometry (GC/IRMS) coupled with a chromium reduction system. The method was used to determine the δ2H values of trichloroethene (TCE) and 1,2‐cis‐dichloroethene (cis‐DCE).RESULTSThe accuracy of the method was verified by conducting comparison measurements of standards by the conventional offline technique and the new method. The precision of the new analytical method (better than ±7 ‰) is better than that obtained from the offline method. The quantification limits of the headspace‐solid‐phase microextraction (SPME) are 400 µg/L and 200 µg/L for TCE and cis‐DCE, respectively. The quantification limits can be improved by adopting a more efficient pre‐concentration system such as purge‐and‐trap or thermal adsorption.CONCLUSIONSThis analytical method will facilitate the use of hydrogen CSIA on chlorinated solvents, which can be beneficial in multi‐isotope approaches (coupling δ2H values with δ13C and/or δ37Cl values) in field site investigations where source identifications and contaminant behaviours are questioned. Copyright © 2013 John Wiley & Sons, Ltd.
Robust H∞ deconvolution filtering for uncertain singular Markovian jump systems with time‐varying delays
Authors: Zhuang Guangming , Xu Shengyuan , Zhang Baoyong , Xu Huiling , Chu Yuming 
Published: October 2015

SummaryThe problem of H∞ deconvolution filter design for a class of singular Markovian jump systems with time‐varying delays and parameter uncertainties is considered in this paper. By constructing a more comprehensive stochastic Lyapunov‐Krasovskii functional, novel delay‐dependent conditions are established to guarantee the filtering error system is not only stochastically admissible, but also satisfies a prescribed H∞‐norm level for all admissible uncertainties. The desired filter parameters can be obtained by solving a set of strict linear matrix inequalities. Two examples and an electrical RLC circuit example are employed to verify the effectiveness and usefulness of the proposed methods in the paper. Copyright © 2015 John Wiley & Sons, Ltd.
A new ophthalmosaurid ichthyosaur from the Early Cretaceous of Colombia
Authors: Maxwell Erin E. , Dick Daniel , Padilla Santiago , Parra Mary Luz 
Published: October 2015

AbstractCretaceous ichthyosaurs were relatively diverse in temperate latitudes, but few species have been described from the palaeotropics. Here, we describe a new ophthalmosaurid ichthyosaur, Muiscasaurus catheti gen. et sp. nov., from the Barremian–Aptian aged Paja Formation of Colombia. This species is known only from a partial skull and differs from all other ichthyosaurs in the unusual configuration of the external narial opening, slender rostrum, narrow postorbital region, and gracile dentition. It is the second ichthyosaur described from the Paja Formation, suggesting moderate taxonomic and ecological ichthyosaur diversity in the region during the Early Cretaceous.
Fatigue strength of high‐strength steel linings with different types of grouting opening
Authors: Greiner Richard , Lechner Andreas 
Published: October 2015

AbstractOwing to the increased use of high‐strength steel (HSS) grades for steel linings in pressure shafts, the fatigue check becomes more and more critical for the proper design of such components. Eurocode 3, AD 2000 and IIW Recommendations do not consider the specific needs of liners with grouting openings (also called nipples) in combination with the higher steel grades. Therefore, a three‐year research project of the Austrian Research Promotion Agency (FFG) was conducted to focus on investigating the fatigue strength of grouting nipples. This project saw a new design concept for steel linings with nipples established which takes into consideration the design concept of the Eurocode. The new findings regarding the fatigue strength of nipples were embedded in this concept.
The renewal of the pressure shaft for the Kaunertal high‐head hydropower plant in Austria
Authors: Hammer Andreas , Bonapace Paul , Maldet Rainer , Schüller Oswin 
Published: October 2015

AbstractA new steel‐lined pressure shaft and surge tank are being constructed for the existing Kaunertal high‐head hydropower plant. The inclined shaft with a diameter of 4.3 m is approx. 1430 m long and is designed for a pressure head of 100 bar. The steel lining is fully embedded and installed inside the precast concrete segmental lining, which was earlier erected as the tunnelling work progressed. Steel design criteria take into account that the internal pressure is shared between the pipe steel and the rock mass according to the stiffness ratio of lining and rock mass.To support the development of steel lining design and material specifications prior to award of contract, the permissible steel strength vs. ductility was investigated together with the compatibility between pipe material and welding material and the brittle fracture behaviour. In particular, the high‐performance steel and welding materials require a detailed fracture mechanics analysis to establish whether selected materials fit project requirements. Extensive tests were carried out on sample pipes – partly on a full‐size model – by the bidders to select the steel and welding materials. An analysis of the tests revealed interesting results and dependencies on material strength, welding process, filler material and other parameters.An overview of the project, which is being implemented between 2012 and 2015, the design criteria for the steel‐lined shaft and the material specification are presented in this paper.
Torrential downpours in southern England 15 September 2009
Authors: Young Martin 
Published: October 2015

AbstractOn 15 September 2009, localised and unexpectedly heavy rainfall developed across parts of southern England and caused disruption to transport and sporting events in parts of London. This event was characterised by the persistence of heavy rainfall in a long, stationary and very narrow band. This event occurred in a similar synoptic pattern to others which also resulted in anomalous and unexpectedly heavy rain in a narrow band. This article discusses the meteorological background to this event and proposes mechanisms that may have led to the distinctive rainfall structure utilising satellite and radar imagery as well as numerical model output. Copyright © 2011 Royal Meteorological Society
Meteorology and the ancient Greeks
Authors: Bowker David 
Published: October 2015

AbstractThis paper seeks to explore the influence of meteorology on the ancient Greeks, as revealed in certain literary texts, such as Homer's Odyssey, Hesiod's Works and Days, and Aristotle's Meteorologica. The power of meteorology to capture the imagination of the poets is examined, followed by a consideration of the practical influence of the weather on farming, as shown in Hesiod's Works and Days. The final section looks at attempts to explain complex meteorological phenomena and considers the value of Aristotle's Meteorologica. The paper is necessarily a brief overview, intended for those without first‐hand knowledge of the classical background, but forms a basis for more detailed study of any of its key aspects. Copyright © 2011 Royal Meteorological Society
Implementation and assessment of a yeast orphan gene research project: involving undergraduates in authentic research experiences and progressing our understanding of uncharacterized open reading frames
Authors: Bowling Bethany V. , Schultheis Patrick J. , Strome Erin D. 
Published: October 2015

AbstractSaccharomyces cerevisiae was the first eukaryotic organism to be sequenced; however, little progress has been made in recent years in furthering our understanding of all open reading frames (ORFs). From October 2012 to May 2015 the number of verified ORFs had only risen from 75.31% to 78%, while the number of uncharacterized ORFs had decreased from 12.8% to 11% (representing > 700 genes still left in this category; http://www.yeastgenome.org/genomesnapshot). Course‐based research has been shown to increase student learning while providing experience with real scientific investigation; however, implementation in large, multi‐section courses presents many challenges. This study sought to test the feasibility and effectiveness of incorporating authentic research into a core genetics course, with multiple instructors, to increase student learning and progress our understanding of uncharacterized ORFs. We generated a module‐based annotation toolkit and utilized easily accessible bioinformatics tools to predict gene function for uncharacterized ORFs within the Saccharomyces Genome Database (SGD). Students were each assigned an uncharacterized ORF, which they annotated using contemporary comparative genomics methodologies, including multiple sequence alignment, conserved domain identification, signal peptide prediction and cellular localization algorithms. Student learning outcomes were measured by quizzes, project reports and presentations, as well as a post‐project questionnaire. Our results indicate that the authentic research experience had positive impacts on students' perception of their learning and their confidence to conduct future research. Furthermore, we believe that creation of an online repository and adoption and/or adaptation of this project across multiple researchers and institutions could speed the process of gene function prediction. Copyright © 2015 John Wiley & Sons, Ltd.