bluuebunny/crossref_metadata_2025_split huggingface dataset:
A strip loaded dielectric resonator antenna for circular polarisation
Authors: Praveen Kumar A. V. , Hamsakutty V. , Yohannan Jaimon , Mathew K. T. 
Published: April 2006

AbstractThe paper presents an experimental investigation of a cylindrical dielectric resonator antenna (DRA) with a conducting strip loaded on its top surface enabling circular polarisation. A simple 50Ω microstrip transmission line excites the antenna. The reflection, polarisation, and radiation characteristics of the antenna are studied. The antenna exhibits circular polarisation with an axial ratio (AR) < 3 dB over a bandwidth of 3.14% and a beam width of 60°. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1354–1356, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21660
Tunable side‐polished optical fiber filter using the thermo‐sensitive characteristics of the polymer dispersed liquid crystal
Authors: Lee Cherl‐Hee , Lee Nam‐Kwon , Song Jae‐Won 
Published: April 2006

AbstractThe tunable property of a side‐polished optical fiber filter developed using a polymer dispersed liquid crystal (PDLC) is investigated. The thermo‐sensitive characteristic of the PDLC provides the new type of tunable side‐polished optical fiber filter with a desirable free spectral range (FSR) and eliminates the influence of the high refractive index of indium tin oxide (ITO). As a result, the resonance wavelength of the side‐polished fiber filter is tuned at a rate of −0.015 nm/mW. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1229–1230, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21662
Three‐antenna MIMO system for WLAN operation in a PDA phone
Authors: Wong Kin‐Lu , Chang Chih‐Hua , Chen Brian , Yang Sam 
Published: April 2006

AbstractA multiple input multiple output (MIMO) system using three EMC (electromagnetic compatible) chip antennas in a personal digital assistant (PDA) phone is demonstrated. The three EMC chip antennas are mounted at three corners of the system ground plane of the PDA phone and all generate a wide bandwidth covering the wireless local area network (WLAN) operation in the 2.4‐GHz band (2400–2484 MHz). By adding a T‐shaped shorted strip in the proposed MIMO antenna system, large improvements in the isolation (S12, S13, and S23 all less than −20 dB) between any two antennas of the MIMO system are achieved. Detailed effects of the T‐shaped shorted strip on the isolation improvement in the proposed MIMO antenna system are analyzed. Radiation characteristics of the three antennas are also studied. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1238–1242, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21665
Leaf‐shaped monopole antenna with extremely wide bandwidth
Authors: Bai Xiao‐Feng , Zhong Shun‐Shi , Liang Xian‐Ling 
Published: April 2006

AbstractA leaf‐shaped monopole antenna with an extremely wide bandwidth is introduced. The antenna is composed of a leaf‐shaped metal sheet with three circular holes vertically mounted on the ground plate covered by a dielectric layer. Its measured −10‐dB return‐loss frequency range is from 1.3 to 29.7 GHz with ratio bandwidth of about 22:1. This antenna provides bandwidth covering the L, C, X, and Ku bands and exhibits a nearly omnidirectional radiation pattern with a simple structure, which is suitable for various military and commercial ultra‐wideband applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1247–1250, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21668
A novel dual‐frequency dual‐polarized stacked patch microstrip array feed for remote sensing reflector antennas
Authors: Kona Keerti S. , Manteghi Majid , Rahmat‐Samii Yahya 
Published: April 2006

AbstractThis paper presents the design and implementation of a dual‐frequency dual‐linear polarized stacked patch array feed with a novel probe‐feeding architecture for future spaceborne synthetic aperture radar (SAR) applications. To facilitate measurements of soil moisture from space, a large aperture antenna of 30 m operating in VHF (137.5 MHz) and UHF (435 MHz) frequencies is desirable. An array feed that synthesizes a rectangular effective aperture on the 30‐m reflector is proposed in order to obtain matched beams at the VHF and UHF frequencies. We focus on the layout, design, and prototype performance of the stacked‐patch microstrip array designed for scaled operating frequencies of 1.13 GHz (lower patch) and 3.57 GHz (upper patch). The study is also aimed at analyzing the performance of the array in combination with a 3.65‐m reflector. Our test results demonstrate a good correlation between the measurements and simulations from finite‐difference time domain (FDTD) and reflector analysis codes, thus validating the design for use in SAR for soil‐moisture applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1250–1258, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21669
Compact broadband gap‐coupled shorted square microstrip antennas
Authors: Deshmukh Amit A. , Kumar Girish 
Published: April 2006

AbstractVarious suspended compact and broadband gap‐coupled variations of edge center‐shorted and corner‐shorted square microstrip antennas, are proposed. These configurations give larger bandwidth with a smaller total patch size as compared to square microstrip antennas. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1261–1265, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21671
Investigation on spectra of prism‐coupled microdisk resonator
Authors: Yi Fei , Jin Xiaofeng , Zheng Shilie , Zhang Xianmin 
Published: April 2006

AbstractA prism‐coupled microdisk‐resonator‐based optical filter with the FSR of 15.8 GHz andQvalue of 5.7 × 104is proposed. The theory of the filtering characteristics due to multiloop interference and its dependence on the coupling coefficient is presented. Influence of factors such as the prism‐cavity gap size, the receiving angle, and the receiving position on theQvalue and the resonant frequencies of the spectrum are investigated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1265–1269, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21672
Fabrication and measurement of miniaturized Z‐shaped corrugated‐type patch antenna for WLAN
Authors: Lee Won‐Jong , Go Min‐Ho , Kim Yong‐Kyun , Park Hyo‐Dal 
Published: April 2006

AbstractThis paper presents the characteristics of the miniaturized Z‐shaped meander‐type antenna realized for 5.25‐GHz wireless LAN systems. The proposed antenna consists of the modified meander line, corrugated shape, and shorting pin with coaxial feeding on the two‐layered (air and FR4) substrate, which forms the letter “Z.” This proposed antenna has equivalent performance with about 44.87% of size reduction with respect to conventional antennas. Its maximum measured impedance bandwidth (−10‐dB below) is approximately 300 MHz (5.05–5.35 GHz) or 5.76%, which meets to the bandwidth requirement of WLAN (5.15–5.35 GHz) systems. Details of the proposed antenna are described and experimental results of constructed prototypes also are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1269–1271, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21673
Broadband and high‐gain printed antennas constructed from Fabry–Perot resonator structure using EBG or FSS cover
Authors: Ge Zhi‐Chen , Zhang Wen‐Xun , Liu Zhen‐Guo , Gu Ying‐Ying 
Published: April 2006

AbstractFabry–Perot resonators with EBG or FSS cover are introduced to enhance the gain of printed antenna. Based on a systematic comparison study, two kinds of optimization designs are proposed for enhancing the gain and reducing the backward radiation. The validation of the simulated and experimental results confirms that the expected performance is met. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1272–1274, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21674
Fabrication and measurement of modified spiral‐patch antenna for use as a triple‐band (2.4GHz/5GHz) antenna
Authors: Yoon JoongHan 
Published: April 2006

AbstractThis paper describes the design, fabrication, and measurement of a modified spiral‐patch antenna with a shorting pin. The prototype consists of a modified spiral model and was made using the shorting‐pin method. The prototype of the proposed antenna was designed to achieve triple‐band operation at the 2.4‐ and 5‐GHz bands. To obtain a sufficient bandwidth, a foam layer was inserted between the ground plane and the substrate. This is a microstrip antenna for IEEE 802.11a/b WLAN application. The simulated and measured results for the impedance bandwidth, radiation pattern, and gain are presented and discussed herein. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1275–1279, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21675
Dual‐linearly‐polarized microstrip array based on composite right/left‐handed transmission line
Authors: Jianfang Zhu Qi Zhu , Wei Lu , Lei Wu , Shanjia Xu 
Published: April 2006

AbstractA novel dual‐linearly‐polarized microstrip antenna array with series‐feeding configuration is presented. Dual‐linear polarization is excited by upper side‐feeding and lower aperture‐coupled feeding. Meanwhile, the series‐feeding configuration is realized by a composite right/left‐handed transmission line. Compared with the traditional parallel and series‐fed configuration, this array is of simple structure, small area, and high efficiency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1366–1369, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21678
Complete assignments of 1H and 13C NMR spectra of leucanthoside A, a new triterpenoid saponin from Cephalaria leucantha L.
Authors: Gođevac D. , Mandić B. , Vajs V. , Menković N. , Macura S. , Milosavljević S. 
Published: April 2006

AbstractLeucanthoside A, a new allose‐containing triterpenoid saponin (1), was isolated from the aerial parts of Cephalaria leucantha L. Its structure was determined by electrospray ionization mass spectrometry and NMR spectroscopy. Complete assignments of the 1H and 13C NMR chemical shifts were achieved by two‐dimensional NMR experiments: DQF‐COSY, NOESY, TOCSY, HSQC, DINE‐HSQC, HMBC, 13C‐1H 2D‐J‐resolved spectroscopy, and 1,1‐ADEQUATE. Copyright © 2006 John Wiley & Sons, Ltd.
Explicit and semi‐implicit CBS procedures for incompressible viscous flows
Authors: Massarotti N. , Arpino F. , Lewis R. W. , Nithiarasu P. 
Published: April 2006

AbstractThis paper presents a numerical comparison of two different numerical procedures based on the characteristic‐based split (CBS) algorithm for the solution of incompressible flows. The first procedure is based on the original semi‐implicit version of the CBS, introduced in the early days of the scheme development. The second was proposed more recently in order to have a fully explicit version of the scheme, and is based on the introduction of an artificial compressibility type of formulation. The interest in fully explicit schemes has increased because of the easy and efficient parallelization. The main differences between the two versions of the schemes are highlighted in this work, and a numerical comparison is presented on the basis of several benchmark solutions. Both steady and unsteady flows are considered. With the explicit version of the scheme a dual time stepping procedure is needed to recover unsteady solutions. Copyright © 2006 John Wiley & Sons, Ltd.
Efficient explicit time stepping for the eXtended Finite Element Method (X‐FEM)
Authors: Menouillard T. , Réthoré J. , Combescure A. , Bung H. 
Published: April 2006

AbstractThis paper focuses on the introduction of a lumped mass matrix for enriched elements, which enables one to use a pure explicit formulation in X‐FEM applications. A proof of stability for the 1D and 2D cases is given. We show that if one uses this technique, the critical time step does not tend to zero as the support of the discontinuity reaches the boundaries of the elements. We also show that the X‐FEM element's critical time step is of the same order as that of the corresponding element without extended degrees of freedom. Copyright © 2006 John Wiley & Sons, Ltd.
Suppression of human selenium‐binding protein 1 is a late event in colorectal carcinogenesis and is associated with poor survival
Authors: Kim Hyunki , Kang Hyun Ju , You Kwon Tae , Kim Se Hoon , Lee Kang Young , Kim Tae Il , Kim Chul , Song Si Young , Kim Hye‐Jung , Lee Cheolju , Kim Hoguen 
Published: April 2006

AbstractThe purpose of this study was to analyze altered protein expression in cancer tissues and determine its relationship to prognosis in colorectal carcinomas. We performed proteomic expression analysis on 14 colorectal carcinomas and matched nontumorous colonic mucosa by 2‐DE and MALDI‐TOF‐MS. Comparative analysis of the respective spot patterns on 2‐DE showed 14 spots that were markedly changed in the colorectal carcinomas. Among them, selenium‐binding protein 1 (SELENBP1) was markedly decreased in 12 (85%) carcinomas. The reduced expression of SELENBP1 was further supported by Western blot analysis and immunohistochemistry. Suppression of SELENBP1 was further analyzed in another eight‐paired adenomas and carcinomas from the same patients using Western blot analysis and immunohistochemistry, and revealed that one adenoma and seven carcinomas exhibited markedly reduced SELENBP1 expression. Patients with low levels of SELENBP1 expression had significantly lower overall survival rates (72 vs. 85%, p = 0.021) among the 240 stages II and III colorectal carcinomas by using tissue microarray analysis. Our findings indicate that suppression of SELENBP1 is a frequent and late event in colorectal carcinogenesis, and may contribute to the rapid progression of colorectal carcinoma.
Poly(dimethylsiloxane)‐based polymer organogelators with L‐lysine derivatives as a organogelation‐causing segment
Authors: Suzuki Masahiro , Owa Sanae , Shirai Hirofusa , Hanabusa Kenji 
Published: April 2006

AbstractNew poly(dimethylsiloxane)‐based polymer organogelators with L‐lysine derivatives were synthesized on the basis of synthetically simple procedure, and their organogelation abilities were investigated. These polymer organogelators have a good organogelation ability and form organogels in many organic solvents. In the organogels, polymer gelators constructed a mesoporous structure with a pore size of about 1 μm formed by entanglement of the self‐assembled nanofibers. The L‐lysine derivatives in the polymer gelators functioned as a gelation‐causing segment and the organogelation was induced by self‐assembly of the L‐lysine segments through a hydrogen bonding interaction. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3817–3824, 2006
Eu2+, Eu3+ and Sm3+ emission in SrAl12O19 phosphors prepared via combustion synthesis
Authors: Singh Vijay , Zhu Jun‐Jie , Natarajan V. 
Published: April 2006

AbstractStrontium hexa‐aluminate phosphors activated with Eu3+ and Sm3+ ions were produced at low temperatures (500 °C) by the combustion of corresponding metal nitrate–urea mixtures over a period of 5 min. Powder X‐ray diffraction characterization and photoluminescence studies of these samples were carried out. It was found that co‐doping of Sm3+ ions helps in the partial reduction of Eu3+ ions to Eu2+ ions in SrAl12O19. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Fluorescence spectroscopic study of the phase transformation of γ‐Al2O3 at high temperatures
Authors: Luo Meng‐Fei , Fang Ping , He Mai , Xie Yun‐Long 
Published: April 2006

AbstractThe phase transformation of γ‐Al2O3 at high temperatures was characterized using X‐ray diffraction (XRD) and fluorescence techniques. The results of a comparative fluorescence spectroscopic study of commercial and pure Al2O3 show that with laser excitation at 632.8 and 514.5 nm the absorption bands at 683.8 and 686.7 nm (R‐line luminescence) are attributed to the presence of Cr3+ ions in octahedral coordination in a θ‐Al2O3 environment. The other two bands at 692.8 and 694.4 nm (R2 and R1 lines) are attributed to Cr3+ fluorescence in an α‐Al2O3 environment. Compared with XRD measurements, fluorescence spectroscopy has a higher sensitivity for identification of phase transformations in θ‐Al2O3 and α‐Al2O3. According to the different absorptions of Al2O3 with two laser excitations, the laser excitation at 514.5 nm is found to be more sensitive at the surface region while the laser excitation at 632.8 nm supplies information about the bulk. The fluorescence spectra together with UV–visible diffuse reflectance spectra and XRD patterns indicate that the γ‐Al2O3 starts transforming to θ‐Al2O3 and α‐Al2O3 simultaneously at 800 °C. However, the θ‐Al2O3 and α‐Al2O3 compositions of the surface region and the bulk are different. The α‐Al2O3 content at the surface region is higher than that in the bulk. The γ‐Al2O3 sample transforms to α‐Al2O3 completely at 1250 °C. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Activation energy for precipitation hardening and softening in aluminium alloys calculated using hardness and resistivity data
Authors: Sha W. 
Published: April 2006

AbstractThree types of alloys have been studied, Al–Mg, Al–Zn, and Al–Si. The first type of alloys include Al–11.1 wt% Mg, Al–4.5 at% Mg and Al–2.5 at% Mg. The second type includes low Zn contents at 1.3% and 3.2% (at%). The third type includes alloys with Si contents of 1.37%, 2.83% and 6.81% (at%). The results have demonstrated that hardness and resistivity data can be treated to reveal the activation energy of processes, for intervals when there is enough experimental measurement data. Where relevant, the calculation results of the activation energy values are discussed. The errors due to linear regression are given. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Structural, morphological, optical, and nonlinear optical properties of fluorine‐doped zinc oxide thin films deposited on glass substrates by the chemical spray technique
Authors: Castañeda L. , Morales‐Saavedra O. G. , Acosta D. R. , Maldonado A. , de la L. Olvera M. 
Published: April 2006

AbstractFluorine‐doped zinc oxide thin films (ZnO:F) were deposited on sodocalcic glass substrates from an aged solution using a chemical spray technique. The effect of substrate temperature (T S) on the morphological, optical, and nonlinear optical (NLO) properties of the ZnO:F thin films was studied. These films were analysed using X‐ray diffraction, scanning electron microscopy, profilometry, optical transmittance, optical fluorescence, and second (SHG) and third harmonic generation (THG) techniques. A polycrystalline structure with a preferential growth along the ZnO(002) plane was found in all cases, with a corresponding average crystal size of less than 32 nm for the films. The morphology of the surfaces and some optical properties were found to be dependent on T S. The films deposited at low T S (400 °C) showed a uniform surface covered with needle‐like grains as well as SHG and THG response. In contrast, for the films deposited at 525 °C, a porous surface with irregular‐shaped grains was obtained and a substantial reduction of the SHG and THG response was detected. NLO χ (2)eff coefficients one order of magnitude larger than the χ (2)11 component of an α‐quartz reference crystal were measured for all ZnO:F thin films. The χ (3) values of the samples, under resonant conditions, were in the interesting range of 10–12 esu. Finally, a typical optical transmittance higher than 85% and a band gap (E g) of 3.4 eV were evaluated for films deposited under optimal conditions. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Intrinsic ferroelectric hysteresis behaviours for heterostructures
Authors: Chew K.‐H. , Ishibashi Y. , Shin F. G. 
Published: April 2006

AbstractIntrinsic ferroelectric hysteresis behaviours for a heterostructure of interface between two different ferroelectrics of second‐order transition are studied using the Landau–Ginzburg theory. We show that the existence of interfacial coupling could lead to a new polarization reversal mechanism. A detailed description of the polarization reversal mechanism of the heterostructure is discussed based on the hysteresis loops and the spatial variation of polarizations under various electric field strengths. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Computer analysis of an influence of oxygen vacancies on the electronic properties of the SnO2 surface and near‐surface region
Authors: Izydorczyk Weronika , Adamowicz Boguslawa , Miczek Marcin , Waczynski Krzysztof 
Published: April 2006

AbstractAn influence of the surface stoichiometric defects on the electronic and electrical properties of SnO2 layers has been studied by means of computer simulation. The surface potential and in‐depth potential profiles in the accumulation region have been rigorously computed at various temperatures (from 400 to 900 K). The behaviour of both the surface and bulk Fermi level position versus temperature has been analysed. Furthermore, in‐depth profiles of carrier concentration and the surface potential as well as the SnO2 layer conductance for different surface donor density of state have been calculated. It has been found that the surface reduction and bulk donor concentration (in the range from 3 × 1014 to 3 × 1018 cm–3) are strongly correlated with the development of near‐surface accumulation region and thus modification of the layer electrical parameters. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Laser assisted fabrication of Co on Ti–6Al–4V for bio‐implant application
Authors: Majumdar J. Dutta , Ganesan S. M. , Manna I. , Nath A. K. 
Published: April 2006

AbstractIn the present study, attempts have been made to fabricate a Co layer on the surface of Ti–6Al–4V substrate by laser assisted fabrication technique with an objective to develop compositionally graded hip and femoral prostheses. Laser processing was carried out by melting of Co powder (of 25 μm particle size) with a continuous wave CO2 laser and depositing it on Ti–6Al–4V substrate in a layer by layer fashion using Ar as shrouding environment to avoid oxidation. The process variables were applied power density, scan speed and number of layers. During the development of 1st layer, laser power and scan speeds were varied to develop a compositionally graded interface, following which the successive layers were formed. A detailed microstructural study of the fabricated layers was carried out to understand the influence of laser parameters on microstructure. X‐ray diffraction study and energy dispersive spectroscopic analysis were undertaken to see if non‐equilibrium cooling associated with the process has caused formation of any new phase or segregation of elements in the microstructure. Following characterization, the mechanical property (wear resistance) and electrochemical property of the fabricated components have been evaluated. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)