bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parallel Breakup of Polymer Drops under Simple Shear
Authors: Lin Bin , Mighri Frej , Huneault Michel A. , Sundararaj Uttandaraman 
Published: September 2003

AbstractThe deformation and breakup of a single polycarbonate drop in a polyethylene matrix is studied at high temperatures under simple shear flow using a transparent Couette device. We observed “parallel breakup” where the drop breaks after being stretched into a thin sheet parallel to the flow. The breakup occurs at a viscosity ratio greater than 3.5. Deborah number and a stress ratio incorporating elastic moduli can characterize the “parallel breakup”.Deformation and breakup of a polycarbonate drop in a polyethylene matrix.magnified imageDeformation and breakup of a polycarbonate drop in a polyethylene matrix.
Formation of Giant Needle‐Like Polycation‐Bile Acid Complexes
Authors: Kaneko Tatsuo , Ichikawa Ayako , Gong Jian Ping , Osada Yoshihito 
Published: September 2003

AbstractThe complexation of bile acids with various solvated polycations was studied. A one‐to‐one complex was precipitated when an aqueous solution of cholic acid sodium salt (CA) was mixed with aqueous solutions of 3,3‐ionene and grew to form crystals with needle‐like morphology, 3 millimeters in length. Hydrogen bonding of hydroxyls at the steroid face and the spacing between cationic sites of polycations were crucial for the formation of the giant needle.Crossed polarizing microscopic photograph of the complex composed of cholic acid sodium salt and 3,3‐ionene.magnified imageCrossed polarizing microscopic photograph of the complex composed of cholic acid sodium salt and 3,3‐ionene.
Packing Studies on Poly(di‐n‐alkylsilylenemethylene)s
Authors: Park Soo‐Young , Interrante Leonard V. , Farmer B. L. 
Published: September 2003

AbstractThe packing of poly(di‐n‐alkylsilylenemethylene) (PDASMs) chains was studied by using X‐ray, electron diffraction, and molecular modeling methods. X‐ray and electron diffraction measurements revealed unit cells in which the PDASMs were efficiently packed. The PDASM with the longer alkyl side chains, such as poly(di‐n‐propylsilylenemethylene) (PDPrSM), showed packing with the alkyl side chains interlocked with each other like cross‐shaped gears in the two‐dimensional monoclinic unit cell. The PDASM with the shorter ethyl substituent, poly(di‐n‐ethylsilylenemethylene) (PDESM), showed a lack of ability to interlock its side chains due to the short length of the alkyl groups. In these studies, we found that the length of the alkyl side chains could change the packing arrangement of PDASMs from monoclinic to orthorhombic to hexagonal with only short‐range order as the alkyl side chain length decreases at room temperature.The ab projection of a 4 × 4 chain array of poly(di‐n‐propylsilylenemethylene) (PDPSM) in the monoclinic unit cell.magnified imageThe ab projection of a 4 × 4 chain array of poly(di‐n‐propylsilylenemethylene) (PDPSM) in the monoclinic unit cell.
Mathematical analysis of the quasilinear effects in a hyperbolic model blood flow through compliant axi‐symmetric vessels
Authors: Čanić Sunčica , Kim Eun Heui 
Published: September 2003

AbstractIn this paper, we present a mathematical analysis of the quasilinear effects arising in a hyperbolic system of partial differential equations modelling blood flow through large compliant vessels. The equations are derived using asymptotic reduction of the incompressible Navier–Stokes equations in narrow, long channels.To guarantee strict hyperbolicity we first derive the estimates on the initial and boundary data which imply strict hyperbolicity in the region of smooth flow. We then prove a general theorem which provides conditions under which an initial–boundary value problem for a quasilinear hyperbolic system admits a smooth solution. Using this result we show that pulsatile flow boundary data always give rise to shock formation (high gradients in the velocity and inner vessel radius). We estimate the time and the location of the first shock formation and show that in a healthy individual, shocks form well outside the physiologically interesting region (2.8m downstream from the inlet boundary). In the end we present a study of the influence of vessel tapering on shock formation. We obtain a surprising result: vessel tapering postpones shock formation. We provide an explanation for why this is the case. Copyright © 2003 John Wiley & Sons, Ltd.
The asymptotic behaviour of global smooth solutions to the multi‐dimensional hydrodynamic model for semiconductors
Authors: Hsiao Ling , Ju Qiangchang , Wang Shu 
Published: September 2003

AbstractWe establish the global existence of smooth solutions to the Cauchy problem for the multi‐dimensional hydrodynamic model for semiconductors, provided that the initial data are perturbations of a given stationary solutions, and prove that the resulting evolutionary solution converges asymptotically in time to the stationary solution exponentially fast. Copyright © 2003 John Wiley & Sons, Ltd.
Classical predator–prey system with infection of prey population—a mathematical model
Authors: Chattopadhyay J. , Pal S. , Abdllaoui A. El 
Published: September 2003

AbstractThe present paper deals with the problem of a classical predator–prey system with infection of prey population. A classical predator–prey system is split into three groups, namely susceptible prey, infected prey and predator. The relative removal rate of the susceptible prey due to infection is worked out. We observe the dynamical behaviour of this system around each of the equilibria and point out the exchange of stability. It is shown that local asymptotic stability of the system around the positive interior equilibrium ensures its global asymptotic stability. We prove that there is always a Hopf bifurcation for increasing transmission rate. To substantiate the analytical findings, numerical experiments have been carried out for hypothetical set of parameter values. Our analysis shows that there is a threshold level of infection below which all the three species will persist and above which the disease will be epidemic. Copyright © 2003 John Wiley & Sons, Ltd.
Uniform stabilization of a one‐dimensional hybrid thermo‐elastic structure
Authors: Dalsen Marié Grobbelaar‐Van 
Published: September 2003

AbstractThis paper is concerned with the stabilization of a one‐dimensional hybrid thermo‐elastic structure consisting of an extensible thermo‐elastic beam which is hinged at one end with a rigid body attached to its free end. The model takes account of the effect of stretching on bending and rotational inertia. The property of uniform stability of the energy associated with the model is asserted by constructing an appropriate Lyapunov functional for an abstract second order evolution problem. Critical use is made of a multiplier of an operator theoretic nature, which involves the fractional power A−1/2 of the bi‐harmonic operator pair A acting in the abstract evolution problem. An explicit decay rate of the energy is obtained. Copyright © 2003 John Wiley & Sons, Ltd.
Sound propagation in a channel with a discontinuity in the form of a semicircle
Authors: Weise Volkmar 
Published: September 2003

AbstractFor the description of wave propagation in ducts with variable cross‐sections it is necessary to determine reflection and transmission at the points of discontinuity in the cross‐sectional contour. Analytic solutions are well known for rectangular and circular duct cross‐sections with rotational symmetric arrangements. The aim of this paper is the description of sound propagation in cylindrical ducts with semicircular discontinuities and thus non‐rotationally symmetric discontinuities of the cross‐sectional contour. In particular, excitation with higher azimuthal and radial modes also will be included. This solution is achieved by using the orthogonality properties of the trigonometric and Bessel functions. Copyright © 2003 John Wiley & Sons, Ltd.
Homogenization of Maxwell's equations in dissipative bianisotropic media
Authors: Barbatis G. , Stratis I. G. 
Published: September 2003

AbstractWe study the periodic homogenization of Maxwell's equations for dissipative bianisotropic media in the time domain, both in R3 and in a bounded domain with the perfect conductor boundary condition. We consider both local with respect to time (optical response region) and non‐local in time (allowing dispersive effects) constitutive laws; in the non‐local case the explicit description of the homogenized coefficients is given in terms of the Laplace transform. The principal result of this work is the description of the asymptotic behaviour of the solutions of the considered problems as the period of the electromagnetic parameters tends to zero. Copyright © 2003 John Wiley & Sons, Ltd.
Design and characterization of low‐loss and low‐dispersion micromachined elevated CPW
Authors: Lee Sang‐No , Kim Yong‐Jun , Yook Jong‐Gwan 
Published: September 2003

AbstractIn this paper, the performance of a 10‐μm‐elevated low‐loss and low‐dispersion elevated coplanar waveguide (ECPW) is presented. It is shown that a wide range of characteristic impedances, encompassing the 40–100Ω range, is obtainable. A very low effective dielectric constant (close to 1) is predicted based on the 3D finite‐difference time‐domain (FDTD) method and confirmed by measurement. The overlapped configuration on standard silicon reveals the best performance, with a loss of about 0.2 dB/mm, which is much lower than that of a conventional CPW at 40 GHz. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 169–171, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11159
On the angular resolving powers of cross‐loop/monopole antenna arrays based on the music algorithm
Authors: Shi Xin‐Zhi , Wen Bi‐Yang , Wang Gaofeng , Wang Bing‐Zhong 
Published: September 2003

AbstractTo increase HF‐GWR portability, it is very desirable to use smaller antennas yet achieve higher angular resolving power. Based on the MUSIC algorithm, the angular resolving powers of various combined cross‐loop/monopole and monopole antenna arrays are studied with variations of target angles, signal‐to‐noise ratio, and sampling density. It is found that a combination of two cross‐loop/monopole antennas plus one monopole antenna gives the best performance. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 171–175, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11160
A broadband microstrip antenna: SGMFP antenna
Authors: Gao S. , Sambell A. , Korolkiewicz T. , Smith D. 
Published: September 2003

AbstractA novel structure of broadband microstrip antennas, termed the SGMFP antenna, is proposed. It is consisted of a slot in the ground plane, a microstrip feedline supported on a substrate, a foam layer, and a patch. It can achieve broad bandwidth and high polarisation purity. By using a single patch, two design examples are provided, which achieves a bandwidth (S11 < −10 dB) of 23.7% and 20.3%, respectively. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 175–178, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11161
Broadband matching of stacked patch antennas using a single line‐transformer technique
Authors: Zentner Radovan , Bartolic Juraj , Zentner Ervin 
Published: September 2003

AbstractThis paper presents a synthesis of simple broadband matching networks consisting of a single line transformer. The procedure uses explicit, measured, or calculated input impedance values and finds characteristic impedance and length of line which match the load to the desired SWR. This kind of matching is especially useful for broadband stacked‐patch configurations, because here microstrip technology provides for arbitrary characteristic impedances of the transformer. The effectiveness of the procedure is demonstrated by examples of two different stacked patch configurations. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 178–183, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11162
Analysis of signal propagation on high‐speed planar interconnect systems based on full‐wave and macromodeling techniques
Authors: Liu En‐Xiao , Li Er‐Ping , Li Le‐Wei 
Published: September 2003

AbstractAn accurate and systematic approach for the analysis of signal propagation at high‐speed planar interconnect systems is proposed in this paper. The approach integrates a macromodeling technique based on the full‐wave time domain method and rational function approximation together with the SPICE circuit simulation. The admittance Y transfer function in the form of a set of discrete frequency sampling data is established by using the full‐wave finite‐difference time‐domain (FDTD) method, which characterizes the high‐speed planar interconnect subnetwork. Thereafter, the macromodel of the interconnect subnetwork is constructed through rational function approximation by using the Vector fitting method, which results in an accurate and robust solution for the overall problem. Subsequently, the resultant macromodel can be synthesised and converted to a SPICE‐compatible equivalent circuit. Therefore, the signal propagation analysis is finally facilitated and expedited by using the SPICE circuit simulator. Numerical experiments are presented in this paper to verify the accuracy and efficiency of the proposed method. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 183–187, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11163
Compact single‐level and multilevel folded‐line RF power dividers
Authors: Lim C. , Settaluri R. K. , Tripathi V. K. , Weisshaar A. 
Published: September 2003

AbstractA new design methodology for compact single‐level and multilevel folded‐line radio frequency (RF) power dividers is presented. Simple design equations are developed for compact 3‐dB Wilkinson power dividers with single and cascaded folded‐line C‐sections. The new topologies show a reduction in footprint area to less than 40% of the conventional topology for single‐level compact designs and to less than 17% of the conventional topology for a multilevel compact design. The new compact designs are validated by full‐wave electromagnetic simulation as well as measurements. Excellent agreement is reported. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 187–189, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11164
Design improvements in distributed amplifiers for optical receiver front ends
Authors: Giannini F. , Limiti E. , Orengo G. , Serino A. , De Dominicis M. 
Published: September 2003

AbstractThis paper reports circuit design improvements with respect to classical distributed transimpedance amplifiers for optical receiver front ends to obtain the highest gain and bandwidth performances using a low‐cost MMIC technology. The design issues have been applied to the design of a front‐end amplifier for optical links up to 10 Gb/s, and an effective transimpedance gain of 48 dBΩ and a bandwidth from dc to 9 GHz are achieved. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 190–193, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11165
Examination of boundary conditions performance for estimating accuracy of MoM solutions on square plate benchmark geometry using triangle doublet basis functions
Authors: Bogdanov F. G. , Jobava R. G. 
Published: September 2003

AbstractThe boundary conditions performance (BCP) is shown to be an appropriate error criterion to estimate accuracy of method of moments (MoM) solutions on arbitrary structures, including open surfaces. A proper BCP error metric for electric field integral equations (EFIE) formulation is defined and applied for estimating accuracy on square plate benchmark geometry for triangle doublet basis functions. Comparison of BCP error with current and charge density distribution errors on the benchmark geometry is carried out based on the known benchmark solutions for the surface currents. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 193–196, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11166
Single‐voltage‐supply operation of Ga0.51In0.49P/AlGaAS/IN0.15Ga0.85As PHEMTS with high‐power density
Authors: Tu Hsing‐Yuan , Pan Hsuan‐Yu , Lu Shey‐Shi 
Published: September 2003

AbstractA Ga0.51In0.49P/AlGaAs/In0.15Ga0.85As PHEMT with the highest power density among all single‐voltage‐supply operated devices, to our knowledge, was demonstrated for the first time. Operating at 1.8‐GHz under class‐A bias conditions, this FET shows 18.84‐dBm (382.8 mW/mm) saturated power and 17.25‐dBm (265.4 mW/mm) P1dB when the drain voltage is 3.6 V. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 196–199, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11167
Experimental demonstration of a direction‐of‐arrival estimation algorithm for millimeter‐wave switched‐beam array antennas
Authors: Sanchis P. , Polo V. , Herrera J. , Corral J. L. , Choi Moon‐Soon , Marti J. 
Published: September 2003

AbstractIn this paper, the experimental demonstration of a direction‐of‐arrival (DOA) estimation algorithm, based on power measurements and suitable for switched‐beam array antennas operating in the millimeter‐wave band, is reported. Simulation and experimental results for the proposed algorithm using a four‐element array antenna operating at 60 GHz have been obtained, showing excellent agreement. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 199–201, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11168
60‐GHz radio‐on‐fiber distribution of 2 × 622 Mb/s WDM channels using remote photonic‐frequency upconversion
Authors: Seo Young‐Kwang , Seo Jun‐Hyuk , Choi Woo‐Young 
Published: September 2003

AbstractA new distribution scheme of WDM channels in a 60‐GHz radio‐on‐fiber system is demonstrated by using the remote photonic‐frequency upconversion technique. The frequency upconversion of WDM data with 60‐GHz optical local‐oscillator signals is performed remotely at base stations with cross‐gain modulation in a semiconductor optical amplifier (SOA) and using square‐law photo detection of a photo‐diode (PD). © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 201–203, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11169
Dynamic behavior of MEM‐mirrors for tunable vertical cavity surface‐emitting lasers
Authors: Guan Yan , Matin M. A. 
Published: September 2003

AbstractTunable vertical cavity surface‐emitting lasers (VCSELs) are potentially useful for future optical networks. To date, the most successful mechanics to realize wavelength tunability in tunable VCSELs resides in MEM‐VCSELs via microelectromechanical (MEM) technology. The key parts to accomplish wavelength tuning in these MEM‐VCSELs are controllably movable top mirrors. We present dynamic problems in developing and characterizing these micromirrors. Simulation results of four different mirror shapes with different dimensions are presented. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 203–207, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11170
Synthesis of impedance‐matching networks for RF‐power amplifier applications
Authors: Kim Nam‐Tae 
Published: September 2003

AbstractThe design of an RF‐power amplifier using the distributed network synthesis in order to achieve the required performance over an operating frequency range is presented. The transfer function of distributed matching circuits, which are useful for the design of RF‐power amplifiers, is derived using an equal ripple approximation. Element values of the network used to match device models are calculated in terms of minimum insertion losses and ripples for a specified network topology. To verify the performance of synthesized circuits, the results are applied to the design of an RF transistor power amplifier with an appropriate device‐modeling technique. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 207–211, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11171
A new dual‐band planar inverted‐F antenna for ISM‐band applications
Authors: Kim Sun K. , Park Jong K. , Choi Soek H. , Park Jae Y. 
Published: September 2003

AbstractThis paper proposes a new dual‐band planar inverted‐F antenna (PIFA) for ISM‐band applications. The proposed antenna is designed using the Microwave Studio Software of Computer Simulation Technology (CST). The measured results of the antenna are compared with the simulated results. The effects of antenna parameters such as the slit geometry and ground plane are studied. Both lower and upper frequency bands can be determined independently, which is very useful for the design of dual‐band antennas. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 211–214, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11172
A laminated ceramic bandpass filter realized using coupled stepped‐impedance resonators
Authors: Wang Xuedong , You Bin , Ji Wusheng , Li Ying 
Published: September 2003

AbstractA tapped bandpass filter composed of two coupled stepped‐impedance resonators (SIRs) is proposed. The two resonators are arranged in different plane. The volume of proposed filter is about 60% of that of conventional filter. We investigate the filtering characteristics using both network analysis and experimentation. It is shown that this filter has a very sharp response below its passband. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 214–216, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11173
Rigorous modeling of arbitrary conformal microstrip filters and spiral inductors using the FDTD method
Authors: El Brak Mohamed , Essaaidi Mohamed 
Published: September 2003

AbstractIn this paper, a direct 3D finite‐difference time‐domain (FDTD) approach is implemented to investigate the electromagnetic behavior of arbitrary conformal microstrip filters and spiral inductors. To this end, the frequency dependence of the scattering‐matrix parameters of these microstrip circuit configurations has been studied in depth. The proposed model approaches the curved regions of the studied structures using a staircase discretization scheme. The obtained numerical results have been validated by comparisons with measured results in the literature, which considered extreme cases where the considered structures are planar. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 216–221, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11174
A novel time‐domain technique using wavelet‐like basis functions
Authors: Hutchcraft W. Elliott , Gordon Richard K. 
Published: September 2003

AbstractA novel technique for the solution of electromagnetics problems in the time domain is proposed. In this technique, wavelet‐like functions are used as the basis set for the field components. The time‐domain algorithm is derived and examples using the technique are presented. Comparisons with analytic results and numerical results obtained using the finite‐difference time‐domain (FDTD) technique will be provided. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 221–226, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11175