bluuebunny/crossref_metadata_2025_split huggingface dataset:
Highly Selective Synthesis of [(Z)‐3‐Chloro‐2‐(phenylselanyl)‐1‐alkenyl]phosphonates and 2‐Ethoxy‐4‐(phenylselanyl)‐2,5‐dihydro‐1,2‐oxaphosphole 2‐Oxides by Electrophilic Reaction of 1,2‐Alkadienylphosphonates with PhSeCl
Authors: He Guangke , Yu Yihua , Fu Chunling , Ma Shengming 
Published: November 2009

AbstractThe reactions of monosubstituted 1,2‐alkadienylphosphonates with PhSeCl in THF or dioxane/H2O (10:1) at 70 °C afforded the selenochlorination products [(Z)‐3‐chloro‐2‐(phenylselanyl)‐1‐alkenyl]phosphonates with very high chemo‐ and stereoselectivity, whereas the same reaction with di‐ and trisubstituted allenylphosphonates afforded 2‐ethoxy‐4‐(phenylselanyl)‐2,5‐dihydro‐1,2‐oxaphosphole 2‐oxides exclusively. It was interesting to note that the stereoselctivity for the selenochlorination reaction is opposite to that of the iodo‐ and selenohydroxylation reactions of (allenyl)diphenylphosphane oxides with Cl– acting as the nucleophile. The stereoselectivity of the cyclization reaction is clearly different from that of the selenochlorination reaction.
Drug effect on EEG connectivity assessed by linear and nonlinear couplings
Authors: Alonso Joan F. , Mañanas Miguel A. , Romero Sergio , Hoyer Dirk , Riba Jordi , Barbanoj Manel J. 
Published: November 2009

AbstractQuantitative analysis of human electroencephalogram (EEG) is a valuable method for evaluating psychopharmacological agents. Although the effects of different drug classes on EEG spectra are already known, interactions between brain locations remain unclear. In this work, cross mutual information function and appropriate surrogate data were applied to assess linear and nonlinear couplings between EEG signals. The main goal was to evaluate the pharmacological effects of alprazolam on brain connectivity during wakefulness in healthy volunteers using a cross‐over, placebo‐controlled design. Eighty‐five pairs of EEG leads were selected for the analysis, and connectivity was evaluated inside anterior, central, and posterior zones of the scalp. Connectivity between these zones and interhemispheric connectivity were also measured. Results showed that alprazolam induced significant changes in EEG connectivity in terms of information transfer in comparison with placebo. Trends were opposite depending on the statistical characteristics: decreases in linear connectivity and increases in nonlinear couplings. These effects were generally spread over the entire scalp. Linear changes were negatively correlated, and nonlinear changes were positively correlated with drug plasma concentrations; the latter showed higher correlation coefficients. The use of both linear and nonlinear approaches revealed the importance of assessing changes in EEG connectivity as this can provide interesting information about psychopharmacological effects. Hum Brain Mapp, 2010. © 2009 Wiley‐Liss, Inc.
Catchment transit times and landscape controls—does scale matter?
Authors: Hrachowitz M. , Soulsby C. , Tetzlaff D. , Speed M. 
Published: November 2009

AbstractMean transit times (MTTs) can give useful insights into the internal processes of hydrological systems. However, our understanding of how they vary and scale remains unclear. We used MTT estimates obtained from δ18O data from 20, mostly nested, contrasting catchments in North East Scotland, ranging from 1 to 1700 km2. The estimated MTTs ranged between 270 and 1170 days and were used to test a previously developed multiple linear regression (MLR) model for MTT prediction based on metrics of soil cover, landscape organization and climate. We show that the controls on MTT identified by the MLR model hold with the independent data from these 20 sites and that the MLR can be used to predict MTT in ungauged montane catchments. The dominant controls also remain unchanged over four orders of magnitude of catchment size, suggesting no major change of dominant flow paths and mixing processes at larger scales. This is consistent with the fact that only the variance of MTT, rather than MTT, showed a scaling relationship. MTTs appeared to converge with increasing catchment scale, apparently due to the integration of heterogeneous headwater responses in larger downstream catchments. Copyright © 2009 John Wiley & Sons, Ltd.
Millimetre‐wave polarization‐dependant monopulse printed Fresnel reflector
Authors: Nguyen Truc Phong , Pichot Christian , Migliaccio Claire 
Published: November 2009

AbstractThis article describes the principle of combining circular or annular patches with C‐patches on a Fresnel reflector that introduces radiation pattern diversity according to the polarization. Patches were designed to perform a 180° phase difference of the reflection phase between two orthogonal polarizations for a monopulse antenna purpose. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 25–28, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24822
Compact rat‐race ring coupler with capacitor loading
Authors: Shao Wei , He Jun , Wang Bing‐Zhong 
Published: November 2009

AbstractA simple compact microstrip rat‐race ring coupler with capacitor loading is presented in this letter. The new coupler not only effectively reduces the occupied area to 15% of the conventional one at 1.0 GHz, but also has high harmonic suppression performance over a wide band. Furthermore, the new structure has only two variable parameters and can be easily designed. The design is validated both by simulation and measurement. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 7–9, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24823
An efficient iterative method for analysis of a substrate integrated waveguide structures
Authors: Zairi Hassen , Baudrand Henri , Gharsallah Ali , Hafidh Gharbi A. 
Published: November 2009

AbstractThe article presents an efficient method for characterization of substrate integrated waveguide structures. Substrate integrated circuits are considered as an ensemble of conducting vias placed in a parallel‐plate waveguide. The analysis is based on the wave concept formulation and the iterative resolution of two relationships between incident and reflected volume‐waves. The reflection operator is expressed using Hankel functions and computed by considering the scattering from the ensemble of conducting posts. Numerical results have been obtained for substrate integrated waveguide (SIW) structures already presented in literature. Simulations obtained are compared with recent published results. A good agreement is achieved together with significant improvements both in computational time and memory requirements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 45–48, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24825
Adaptive‐network‐based fuzzy inference system models for computing the characteristic impedances of air‐suspended trapezoidal and rectangular‐shaped microshield lines
Authors: Turkmen Mustafa , Yildiz Celal , Guney Kerim , Kaya Sabri 
Published: November 2009

AbstractIn this article, adaptive‐network‐based fuzzy inference system (ANFIS) models are proposed to compute the characteristic impedances of air‐suspended trapezoidal‐shaped microshield lines (AS‐TSMLs) and air‐suspended rectangular‐shaped microshield lines (AS‐RSMLs). The ANFIS is a fuzzy inference system implemented within the architecture and optimization procedure of adaptive networks. Four optimization algorithms, hybrid learning, simulated annealing, genetic, and least‐squares, are used to determine optimally the design parameters of ANFIS. The characteristic impedance results of ANFIS models are in very good agreement with the results available in the literature. When the performances of ANFIS models are compared with each other, the best results are obtained from the ANFIS model trained by the hybrid learning algorithm. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 20–24, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24829
Bandwidth enhancement of rectangular monopole antenna using modified semi‐elliptical ground plane and slots
Authors: Kimouche H. , Abed D. , Atrouz B. , Aksas R. 
Published: November 2009

AbstractThis article presents an optimized design for a novel printed monopole antenna, with a notched semi‐elliptical ground plane. A parametric study of the antenna parameters and their effects is given. The monopole antenna with the proposed bandwidth enhancement technique covers the band 3.1–10.6 GHz, which has been approved by the Federal Communications Commission as a commercial band for ultra‐wideband communication systems, with a measured return loss bandwidth of 7.9 GHz (2.9–10.8 GHz). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 54–58, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24830
Isolation improvement of 2.4/5.2/5.8 GHz WLAN internal laptop computer antennas using dual‐band strip resonator as a wavetrap
Authors: Kang Ting‐Wei , Wong Kin‐Lu 
Published: November 2009

AbstractA high‐isolation two‐antenna structure comprising two small‐size uniplanar WLAN antennas and a dual‐band strip resonator embedded in‐between for laptop computer application is presented. The proposed design occupies a small planar size of 9 × 50 mm2when mounted above the top edge of the large supporting metal frame of the laptop display. The two WLAN antennas are coupled‐fed printed PIFAs capable of covering 2.4/5.2/5.8 GHz band operation, each occupying a size of 9 × 13 mm2and both facing to each other back‐to‐back with a spacing of 24 mm (that is, the total length of the proposed two‐antenna structure is 50 mm). The embedded strip resonator functions as a dual‐band wavetrap over the 2.4 and 5.2/5.8 GHz bands to trap the antenna's near‐field radiation between the two antennas, which effectively reduces the mutual coupling between the two antennas. Good measured isolation (S21< −18 dB) over the 2.4/5.2/5.8 GHz bands is obtained, which is acceptable for practical laptop computer applications. The proposed design works for the large ground plane condition in the laptop computer, different from many of the reported two‐antenna designs working for the relatively much smaller ground plane conditions such as in the mobile phones and PC cards. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 58–64, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24831
Microstrip rat‐race couplers with predetermined miniaturization and harmonic suppression
Authors: Velidi Vamsi Krishna , Pandey Dharmendra Kumar , Sanyal Subrata 
Published: November 2009

AbstractIn this letter, design of compact size rat‐race coupler (RRC), based on impedance‐controlled simple transmission line structure is proposed for predetermined harmonic suppression. The present approach has the advantage that within the fabrication limit of high‐impedance lines, a large number of harmonics are suppressed. Design guidelines are provided. Theoretical predictions are verified by implementing a prototype microstrip RRC, with upto twelfth harmonic of the operating frequency suppressed along with 75% size reduction compared with the conventional RRC. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 30–34, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24832
Ultra‐wideband planar monopole antenna with dual stopbands
Authors: Fan Fangfang , Yan Zehong , Zhang Tianling , Song Yue 
Published: November 2009

AbstractA novel compact ultra‐wideband (UWB) microstrip‐fed planar monopole antenna with dual stopbands is presented. The proposed antenna achieved an impedance bandwidth of 3.1–10.6 GHz with VSWR <2, except the bandwidths of 3.3–3.8 GHz for WiMAX and 5.1–5.9 GHz for WLAN application. By etching four u‐shaped slots with different dimension in the radiating patch, the dual stopbands for WiMAX and WLAN application can be obtained. And the stopband bandwidth for WLAN can be controlled by adjusting the three u‐slots dimension. The fabricated antenna shows the broadband impedance‐matching, good group delay, stable gain, and near omnidirectional radiation patterns. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 138–141, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24842
A novel ultra‐wideband frequency planar notch‐filter antenna
Authors: Gómez‐Calero C. , TahaAhmed B. , Martínez R. 
Published: November 2009

AbstractMany research works have emerged for ultra‐wideband (UWB) systems. One important issue is the antenna design to cover all frequency bands (3.1–10.6 GHz). In most applications, a reduced compact antenna is needed but with several requirements. In this paper, a novel triangle–semicircular planar monopole UWB antenna is presented with a notch filter to avoid the undesirable interferences in ISM (Industrial, Scientific and Medical) band at 5.3 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 213–216, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24845
A fast IE‐FFT solution of 3D coating scatterers
Authors: Yin Jiliang , Hu Jun , Que Xiaofeng , Nie Zaiping 
Published: November 2009

AbstractIn this paper, the integral equation fast Fourier transform (IE‐FFT) is implemented to solve the 3D full and partial coating scatterers. The real boundary condition is approximated by impedance boundary condition. The IE‐FFT is utilized to accelerate the matrix‐vector multiplication in the conjugate gradient (CG) iterative solver. And the Mesh Neighbor preconditioner is used to improve the iterative convergence of the CG solver. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 241–244, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24846
Design and development of a dual‐mode corrugated horn for an offset reflector antenna
Authors: Sharma S. B. , Pujara Dhaval , Chakrabarty S. B. 
Published: November 2009

AbstractThis article presents the design and radiation characteristics of a dual‐mode corrugated matched feed horn. This type of feed eliminates the unwanted high cross‐polarization of an offset parabolic reflector antenna and improves the overall performance of the antenna sub‐system. In a cylindrical corrugated structure, higher order HE21 mode is added with the fundamental HE11 mode to configure a dual‐mode corrugated horn. For the proposed horn, the return‐loss characteristics and the far‐field radiation patterns were measured and the results are compared with the simulated results. The horn has been used as a primary feed device to illuminate a linearly polarized offset parabolic reflector antenna and the improvement in the cross‐polarization has been estimated. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 113–116, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24852
A novel planar UWB monopole antenna with variable frequency band‐notch function based on etched slot‐type ELC on the patch
Authors: Movahedinia R. , Azarmanesh M. N. 
Published: November 2009

AbstractA novel planar ultra‐wideband (UWB) monopole antenna with variable frequency band‐notch characteristic is proposed and investigated for UWB communication applications. The complementary electric‐LC (CELC) resonator is etched inside the circular patch of the monopole antenna to achieve notch frequency band. The designed antenna satisfies the voltage standing wave ratio (VSWR) requirement of less than 2.0 in the frequency band between 2.8 and 12.6 GHz, while showing the WLAN band notched in the frequency band of 5–5.9 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 229–232, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24853
Compact single feed circularly polarized fractal boundary microstrip antenna
Authors: Rao P. Nageswara , Sarma N. V. S. N. 
Published: November 2009

AbstractCompact circularly polarized single feed microstrip antenna using fractal curve as boundary is presented. It is shown that by using fractal curve as boundary to the square patch the size can be reduced by more than 50% without much reduction in gain of the antenna. The antenna gives a good circular polarization with minimum axial ratio close to 0 dB at the center frequency of 2234 MHz. Three decibel axial ratio bandwidth of about 0.81% and 10 dB impedance bandwidth of about 3.25% are obtained with the proposed antenna. The antenna provides almost constant gain of about 4 dBi over the frequency band of operation. Measurement results are compared with simulated results and a very good agreement is obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 141–147, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24854
Target localization and measured scattered field pre‐processing using spectral bandwidth minimization for shallowly buried target problems
Authors: Eyraud Christelle , Geffrin Jean‐Michel , Lewyllie Peter , Franchois Ann , Dubois Anthony 
Published: November 2009

AbstractIn this article, a fast and efficient method to detect and localize shallow buried targets is presented. This technique, based on the electromagnetic scattering measurements, takes profit of the spectral bandwidth properties of the scattered field to pre‐process the measured fields to extract the contribution of the target. It can also provide a quick estimation of the localization of the target under test. Experimental results in the context of rebar detection in concrete are presented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 147–151, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24855
The battery effect in mobile antenna design
Authors: Liang Xu 
Published: November 2009

AbstractThe battery pack is a necessary component of mobile phones and is located in close vicinity of the integrated antenna modules. The battery influence with different ground connection points was investigated for both dual‐band and tri‐band integrated mobile antennas. Experimental results are presented to show this. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 120–122, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24860
Comments on solution of electromagnetic scattering problems by transformation into high order impedance boundary condition
Authors: Yapar Ali , Akduman Ibrahim 
Published: November 2009

AbstractIn an recent article by Tezel (Microwave and Optical Technology Letters 50 (2008), 831–836), it is claimed that a new method is derived for the scattering of electromagnetic waves from cylindrical objects having standard impedance boundary condition on its boundary. This article has two fundamental flaws: First, the approach that the author tries to apply is not new; Second, as we prove below the formulation, consequently, the numerical results are completely incorrect. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 244–245, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24861
Experimental comparison of Raman gain efficiency of a dispersion compensating fiber in C and O‐bands
Authors: Saito Lucia A. M. , de Freitas Joao F. L. , de Matos Christiano J. S. , Gomes Anderson S. L. , De Souza Eunezio A. 
Published: November 2009

AbstractWe measured the Raman gain efficiency (RGE) of a dispersion compensating fiber in the C (1530–1565 nm) and O‐bands (1260–1360 nm) and the results revealed that the RGE reaches its maximum value inside the O‐band. The spectral analysis of the fiber loss and Raman efficiency shows that the increase in Raman gain efficiency toward short wavelengths is balanced by the increasing of the fiber attenuation which leads the RGE to be maximum around 1310 nm. In addition, we characterized the gain of a Raman amplifier in the O‐band with a moderate pump power and a few kilometers of fiber. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 151–154, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24865
Study of broadband printed dipole antennas
Authors: Jian‐Ying Li , Khiang Tan Peng 
Published: November 2009

AbstractA broadband microstrip‐fed printed antenna is proposed in this article. Simulations and experiments demonstrate that this structure exhibits a 36% impedance bandwidth with VSWR below 2:1. Antenna geometry and measured antenna characteristics are presented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 184–187, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24867
Multitunable microwave system for touchless heartbeat detection and heart rate variability extraction
Authors: Obeid Dany , Sadek Sawsan , Zaharia Gheorghe , El Zein Ghaïs 
Published: November 2009

AbstractThis work proposes a contactless multitunable microwave measurement scheme for heartbeat detection. Our system is based on simplicity and the ability of tuning two parameters: frequency and power. Measurements are performed at 2.4, 5.8, 10, 16, and 60 GHz. Operating at 2.4 GHz, the heartbeat signal is detected at different output power levels (from −2 down to −27 dBm). The heart rate variability is extracted for all the measurements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 192–198, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24877
A compact modified monopole type internal antenna for wireless USB dongle application
Authors: Yu Yeonsik , Choi Jaehoon 
Published: November 2009

AbstractProposed within this document is a compact internal antenna intended for multiband operation. The antenna consists of two‐pronged elements with two stubs and has a comparatively small volume of 16 mm × 5 mm × 1 mm. The measured return loss of the designed antennas was >10 dB for wireless broadband (WiBro), wireless local area network (WLAN), world interoperability for microwave access (WiMAX), and satellite digital multimedia broadcast (S‐DMB) frequency bands. A high‐quality radiation pattern and a reasonable antenna efficiency were obtained within the desired frequency band. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 198–201, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24878
Output characteristics measurement of a single‐mode fiber Fabry‐Perot resonator at 1.55 μm
Authors: Chen Haiyan 
Published: November 2009

AbstractThe output characteristics of a single‐mode fiber Fabry‐Perot resonator at 1.55 μm operation is experimentally studied with a continuous‐wave laser and pulse light input. In the case of pulse light input, two aspects, considering and no considering birefringence, are discussed. The results obtained are very important for the application of single‐mode fiber Fabry‐Perot resonator. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 101–103, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24881
Comment on: On the inapplicability of a negative‐phase‐velocity condition as a negative refraction condition for active materials
Authors: Kinsler Paul 
Published: November 2009

AbstractI comment on a recent usage of a common negative‐phase‐velocity condition. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 247, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24891