bluuebunny/crossref_metadata_2025_split huggingface dataset:
Decay estimates of solutions for the wave equations with strong damping terms in unbounded domains
Authors: Ikehata Ryo 
Published: August 2002

AbstractThis paper is concerned with some uniform energy decay estimates of solutions to the linear wave equations with strong dissipation in the exterior domain case. We shall derive the decay rate such as $(1+t)E(t)\le C$\nopagenumbers\end for some kinds of weighted initial data, where E(t) represents the total energy. Our method is based on the combination of the argument due to Ikehata–Matsuyama with the Hardy inequality, which is an improvement of Morawetz method. Copyright © 2001 John Wiley & Sons, Ltd.
On diffusion of a single‐phase, slightly compressible fluid through a randomly fissured medium
Authors: Wright Steve 
Published: August 2002

AbstractIn this paper, the Douglas–Peszyńska–Showalter model of diffusion through a partially fissured medium is given a stochastic formulation using the framework for problems in random media as set forth by Jikov, Kozlov and Oleinik. The concept of stochastic two‐scale convergence in the mean is then used to homogenize the randomized micromodels which result. As a consequence of this homogenization procedure, exact stochastic generalizations of results obtained by Clark and Showalter on diffusion through periodically fissured media are derived. Copyright © 2001 John Wiley & Sons, Ltd.
Numerical analysis of a non‐singular boundary integral method: Part I. The circular case
Authors: Dreyfuss P. , Rappaz J. 
Published: August 2002

AbstractIn order to numerically solve the interior and the exterior Dirichlet problems for the Laplacian operator, we present here a method which consists in inverting, on a finite element space, a non‐singular integral operator. This operator is a geometrical perturbation of the Steklov operator, and we precisely define the relation between the geometrical perturbation and the dimension of the finite element space, in order to obtain a stable and convergent scheme. Furthermore, this numerical scheme does not give rise to any singular integral.The scheme can also be considered as a special quadrature formula method for the standard piecewise linear Galerkin approximation of the weakly singular single layer potential, the special quadrature formula being defined by the introduction of a neighbouring curve.In the present paper, we prove stability and we give error estimates of our numerical scheme when the Laplace problem is set on a disk. We will extend our results to any domains by using compact perturbation arguments, in a second paper. Copyright © 2001 John Wiley & Sons, Ltd.
Asymptotics of eigenfrequencies and eigenmodes of non‐homogeneous inextensible filament with an end load
Authors: Shubov Marianna A. , Belinskiy Boris P. , Martin Clyde F. 
Published: August 2002

AbstractWe consider a class of non‐selfadjoint operators generated by the equation and the boundary conditions, which govern small vibrations of an ideal filament with non‐conservative boundary conditions at one end and a heavy load at the other end. The filament has a non‐constant density and is subject to a viscous damping with a non‐constant damping coefficient. The boundary conditions contain two arbitrary complex parameters. We derive the spectral asymptotics for the aforementioned two‐parameter family of non‐selfadjoint operators. In the forthcoming papers, based on the asymptotical results of the present paper, we will prove the Riesz basis property of the eigenfunctions. The spectral results obtained in the aforementioned papers will allow us to solve boundary and/or distributed controllability problems for the filament using the spectral decomposition method. Copyright © 2001 John Wiley & Sons, Ltd.
A new integral equation approach to the Neumann problem in acoustic scattering
Authors: Krutitskii P. A. 
Published: August 2002

AbstractWe suggest a new approach of reduction of the Neumann problem in acoustic scattering to a uniquely solvable Fredholm integral equation of the second kind with weakly singular kernel. To derive this equation we placed an additional boundary with an appropriate boundary condition inside the scatterer. The solution of the problem is obtained in the form of a single layer potential on the whole boundary. The density in the potential satisfies a uniquely solvable Fredholm integral equation of the second kind and can be computed by standard codes. Copyright © 2001 John Wiley & Sons, Ltd.
Impact of process parameters in 40 GHz traveling‐wave amplifiers
Authors: D'agostino Stefano , Paoloni Claudio 
Published: August 2002

AbstractA study on the impact of the variation of the technology process parameters on the performance of a 40 GHz MMIC traveling‐wave amplifier is proposed. In particular, the behavior of the output power as a function of the controllable parameters of the technology process, such as gate length, doping of the active zone, height, and dielectric constant of the substrate, is investigated. The comprehension of the contribution of the various process parameters to the final performance of a wideband traveling‐wave amplifier and their possible tuning are important factors to attain the design requirements. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 421–423, 2001.
An inexpensive distance measuring system for navigation of robotic vehicles
Authors: Furse Cynthia , Kamdar Nilesh 
Published: August 2002

AbstractRobotic vehicles operating indoors may be unable to receive the GPS signals that are commonly used for navigational control. This article describes an inexpensive system for location measurement in the absence of GPS with a range of 7.5 m and a resolution of 3 cm for a mass‐produced cost of under $100. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 84–87, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10241
IP transmission over optical spectral amplitude‐coding CDMA links
Authors: Wei Zou , Ghafouri‐Shiraz H. 
Published: August 2002

AbstractIt has been proposed previously that optical spectral amplitude‐coding CDMA systems have much better performance than other types of optical CDMA systems. In this Letter, the suitability of IP transmission in such systems is investigated, and the performance of the IP traffic transmission over optical spectral amplitude‐coding CDMA links is analyzed. The analytical results indicate that optical CDMA technology is a good candidate for the future IP network. When IP traffic is directly loaded over optical CDMA links, its burst nature will have significant effects on the transmission performance. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 140–142, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10256
New multiple‐region schemes with multiresolution capabilities for the FDTD analysis of radiating structures
Authors: Laisné Alexandre , Gillard Raphaël , Piton Gérard 
Published: August 2002

AbstractIn this Letter multiple‐region FDTD (MR/FDTD) with compressed near‐field to near‐field transform is presented and compared to classical FDTD. Different MR/FDTD simulation strategies are proposed. The suitability of MR/FDTD for the simulation of surrounded antennas in an array configuration is discussed. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 268–273, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10294
Dual‐band plastic chip antenna for GSM/DCS mobile phones
Authors: Wong Kin‐Lu , Su Saou‐Wen , Chiou Tzung‐Wern , Lin Yeh‐Chian 
Published: August 2002

AbstractBy placing a rectangular spiral conducting strip on the top, bottom, and two side surfaces of a rectangular plastic chip of dimensions 5 × 10 × 16 mm3, a novel plastic chip antenna capable of GSM/DCS dual‐band operations in mobile phones is presented. The plastic chip antenna has the attractive feature of surface mountable and generates a lower mode for GSM (890–960 MHz) operation and an upper mode for DCS (1710–1880 MHz) operation. Good antenna performances are also observed. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 330–332, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10312
Hybrid Brillouin/Erbium fibre laser operating at long wavelength band
Authors: Harun S. W. , Tamchek M. , Abd‐Rahman M. K. , Ahmad H. 
Published: August 2002

AbstractThe operation of the hybrid Brillouin/Erbium fibre laser (BEFL) in the long wavelength band (L‐band) region is experimentally demonstrated. It uses a 50‐m long erbium‐doped fibre (EDF) with 400 ppm ion concentration as a gain medium to amplify the Stokes frequency signal generated in single mode fibre (SMF). The stokes frequency is shifted 10 GHz from the Brillouin pump with a tunability from 1598–1612 nm. The BEFL has the potential to be used in future wavelength division multiplexing (WDM) communication systems. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 383–385, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10329
Fractal‐shape small size microstrip patch antenna
Authors: Kim Il‐Kwon , Yook Jong‐Gwan , Park Han‐Kyu 
Published: August 2002

AbstractIn this Letter, a new Koch island microstrip patch antenna is proposed. The Koch patch is fractal shaped and characterized by space‐filling and self‐similarity properties. Due to the space‐filling properties of fractal geometry, the proposed antennas are a smaller in size than conventional Euclidean‐type ones. The characteristics of Koch patches are demonstrated by experimental results: when the fractal iteration factor is 2.5, then the patch is 45% smaller in size than a conventional square patch, thereby maintaining a radiation pattern comparable to that of a normal square patch. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 15–17, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10359
A compact dual‐polarized patch antenna for 1800 MHz band operation
Authors: Tung Hao‐Chun , Wong Kin‐Lu 
Published: August 2002

AbstractAn aperture‐coupled patch antenna with a cross slot for compact dual‐polarized operation in the 1800 MHz band (1710–1880 MHz) suitable for applications in a personal communication system (PCS) is presented. For operation in the 1800 MHz band, the proposed antenna has a square patch of dimensions 50×50 mm2, which is only about 0.69 times that of the conventional design using a simple square patch. With the antenna size reduction achieved, good dual‐polarized performances have also been obtained for the proposed antenna. Excellent port decoupling (less than −37.3 dB) across the entire operating bandwidth is obtained, and good cross‐polarization levels (about 20 dB) for both linear polarizations with an antenna gain level of about 7.0 dBi are observed. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 1–2, 2001.
Large‐signal model predicts dynamic behavior of GaAs MESFET model under optical illumination
Authors: Zamanillo J. M. , Navarro C. , Pérez‐Vega C. , Mediavilla A. , Tazón A. 
Published: August 2002

AbstractThis paper is the result of our research on the large‐signal dynamic behavior (pulsed I/V curves) of a GaAs device, in the overall I/V plane, when the incident optical input power is changed. A complete bias‐ and optical‐power‐dependent large‐signal model for a MESFET is determined from experimental S‐parameters, dc, and pulsed measurements. All derivatives of the model shown here are continuous for a realistic description of circuit distortion and intermodulation. The dependencies of circuit elements with optical illumination and the quiescent operating point are evaluated, and a comparison between theoretical and measured results over optical power and bias ranges is shown. Experimental results show a very good agreement with the theoretical analysis. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 25–31, 2001.
Strip‐loaded hollow dielectric H‐plane sectoral horn antennas for square radiation pattern
Authors: Joseph V. P. , Biju Kumar S. , Mathew K. T. 
Published: August 2002

AbstractThe radiation characteristics of a new type of hollow dielectric H‐plane sectoral horn antenna are presented. Metallic strips of optimum length are loaded on the H‐walls of the sectoral horns. The effects of strip loading for producing square patterns in the H plane are discussed. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 45–46, 2001.
A broadband low‐profile cylindrical monopole antenna
Authors: Row Jeen‐Sheen , Yeh Shih‐Huang , Wong Kin‐Lu 
Published: August 2002

AbstractA broadband low‐profile cylindrical monopole antenna top‐loaded with a shorted circular patch is presented. The shorted circular patch is connected to the antenna ground by two shorting cylinders placed symmetrically on each side of the cylindrical monopole. Experiments have been carried out, and obtained results show that, with an antenna height only about 0.07 times the free‐space wavelength of the center operating frequency, the proposed antenna can have a monopole radiation pattern with an impedance bandwidth of 14.8%, which is much greater than that (3%) of a corresponding monopolar wire‐patch antenna. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 77–79, 2001.
A new three‐dimensional 30 GHz bandpass filter using the LIGA micromachined process
Authors: Park Kyoung‐Youl , Lee Jong‐Chul , Kim Jong‐Heon , Lee Byungje , Kim Nam‐Young , Park Jae‐Young , Kim Geun‐Ho , Bu Jong‐Uk , Chung Ki‐Woong 
Published: August 2002

AbstractIn this letter, a new micromachined 3‐D bandpass filter in the Ka‐band is proposed using the LIGA process. The characteristic impedance and design parameters for the 3‐D filter are determined from the experimental results and the filter design rule. The filter shows a wide‐bandpass characteristic of 39%, with an insertion loss of 1.7 dB at 33.2 GHz, and can be applicable in high‐power MMICs. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 199–201, 2001.
Small wideband triangular patch antenna with an L‐probe feeding
Authors: Guo Y. X. , Luk K. M. , Lee K. F. 
Published: August 2002

AbstractExperimental results for an L‐probe‐fed shorted triangular patch antenna are presented. Using a foam layer of thickness ∼0.13λ0 as a supported substrate, an impedance bandwidth of 61% (SWR≤2) and a gain of over 4.0 dBi in the bandwidth have been obtained. The far‐field patterns are stable across the passband. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 218–220, 2001.
Analysis of higher order TM modes for pentagonal waveguides
Authors: Chen R. S. , Lei Mo , Tsang K. F. , Daoxiang Wang 
Published: August 2002

AbstractIn this paper, the Ritz variational method is proposed to analyze the characteristics of the higher order TM modes for pentagonal waveguides. A series of functions are used as basis function to satisfy the boundary condition of the pentagonal waveguide metal wall. Then the scalar Helmholtz equation is satisfied using the Galerkin technique, and a linear matrix equation is obtained. The zeros of the matrix determinant are solved for the cutoff wavenumbers. The cutoff wavenumber of the first‐order mode is compared with those of the literature and a good agreement is found between them. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31, 115–118, 2001.
Assignment of 1H and 13C NMR data for (−)‐methyl thyrsiflorin A and some scopadulan precursors
Authors: Arnó Manuel , González Miguel A. , Luisa Marín M. , Zaragozá Ramón J. 
Published: August 2002

AbstractThe 1H and 13C NMR spectral analysis of synthetic (−)‐methylthyrsiflorin A and 10 scopadulan precursors is reported. Resonance assignments were based on one‐ and two‐dimensional NMR techniques, which included 1H, 13C, DEPT and HMQC and also 1D NOE difference spectroscopy. Copyright © 2001 John Wiley & Sons, Ltd.
Substituent‐induced 13C chemical shifts of 3‐substituted camphors
Authors: Kaiser Carlos R. , Basso Ernani A. , Rittner Roberto 
Published: August 2002

AbstractThe complete 13C NMR analysis of 3‐substituted camphors with F, Cl, Br, I, OH, OMe, SMe, NHMe, NMe2 and Me substituents at endo and exo positions, and also the corresponding ‘oxo’ and dichloro derivatives, were obtained by 1D and 2D NMR techniques. The resulting substituent‐induced chemical shifts (SCS) for these difunctional systems show the influence of electronic and steric mechanisms. Copyright © 2001 John Wiley & Sons, Ltd.
Total assignment of 1H and 13C NMR spectra of 13α‐ and 13β‐estrone methyl ethers
Authors: Ciuffreda P. , Ferraboschi P. , Verza E. , Manzocchi A. 
Published: August 2002

AbstractThe complete 1H and 13C chemical shift assignments of the 13α‐epimer of estrone methyl ether and of estrone methyl ether itself were carried out, making use of one‐ and two‐dimensional NMR techniques (1D HOHAHA, COSY, NOESY, TOCSY and HSQC). Copyright © 2001 John Wiley & Sons, Ltd.
NMR and theoretical conformational studies of the anticholinergic physostigmine
Authors: Santos‐Sánchez Norma F. , Morales‐Ríos Martha S. , Joseph‐Nathan Pedro 
Published: August 2002

AbstractThe NMR parameters of (−)‐physostigmine free base (1) in CD2Cl2, CDCl3 and DMSO‐d6 were used to determine stereospecific assignments. The vicinal homonuclear coupling constants exhibited by the internally diastereotopic pyrrolidinyl protons of the C‐ring can be interpreted as arising from an interconverting profile of conformations at the fast exchange limit. Physostigmine undergoes epimerization in solution via inversion of the labile chirotopic and stereogenic N1 nitrogen atom, which results in the formation of (N − R,S)‐N1Me diastereoisomers. Protonation at the N1 nitrogen leads to the (N − S)‐N1 Me diastereoisomer of the corresponding salt of 1. Four conformational archetypes were calculated by molecular mechanics based on X‐ray crystallographically determined physostigmine. Copyright © 2001 John Wiley & Sons, Ltd.
Sperm–zona pellucida interaction involves a carbonyl reductase activity in the hamster
Authors: Montfort Lucile , Frenette Gilles , Sullivan Robert 
Published: August 2002

AbstractFor successful fertilization to occur, the spermatozoa must transit through an egg‐specific extracellular matrix or zona pellucida (zp) to reach and ultimately fuse with the oocyte plasma membrane. This process involves ligand–receptor recognition between the zp and the acrosomal cap of the sperm. The hamster sperm protein P26h, a receptor which is acquired during epididymal transit, has been suggested to act in sperm–zp binding. The cloning and characterization of the full‐length cDNA‐encoding hamster P26h revealed 85% identity with a porcine lung carbonyl reductase. To better understand the mechanism by which P26h interacts with zp proteins, we investigated carbonyl reductase activity during gamete interactions. In the present study, we show that specific inhibitors of carbonyl reductase such as diclofenac and phenylbutazone decreases sperm–zp binding without affecting the motility, progressivity or acrosome integrity of sperm. We also detected, and partly purified, carbonyl reductase activities from cauda epididymal sperm protein extract and this activity was associated with an enriched fraction of P26h. Removing P26h from the partly purified protein fractions by immunoaffinity chromatography led to the loss of carbonyl reductase activity. The findings that sperm–zp binding is blocked by carbonyl reductase inhibitors and that P26h is active in mature sperm suggest that P26h could play an important role in the fertilization process. Mol. Reprod. Dev. 61: 113–119, 2002. © 2002 Wiley‐Liss, Inc.
Multislice double inversion pulse sequence for efficient black‐blood MRI
Authors: Song Hee Kwon , Wright Alexander C. , Wolf Ronald L. , Wehrli Felix W. 
Published: August 2002

AbstractOver the last several years there has been a rapidly growing interest in high‐resolution MRI of the vascular wall to assess the extent of atherosclerotic lesions. Vessels of particular clinical relevance are the carotid and coronary arteries. Currently, the preferred imaging sequence for these studies is a “black‐blood” technique based on the double‐inversion scheme to null the blood signal. A critical drawback of the black‐blood technique, however, has been its single‐slice nature, as there is only one point in time during the recovery of the blood magnetization from inversion at which the signal is completely nulled. Consequently, the total scan time can become prohibitively long, particularly when an imaging protocol includes several series of these datasets. In this work, a multiple‐slice double‐inversion technique is described that can reduce the scan time by a factor of two or more. It is demonstrated in vivo with examples from carotid and coronary arteries that one can acquire multiple slices with sufficient nulling of blood, following a single set of inversion pulses. Magn Reson Med 47:616–620, 2002. © 2002 Wiley‐Liss, Inc.
High‐resolution 1H NMR spectroscopy in rat liver using magic angle turning at a 1 Hz spinning rate
Authors: Hu Jian Zhi , Rommereim Donald N. , Wind Robert A. 
Published: August 2002

AbstractIt is demonstrated that a high‐resolution 1H NMR spectrum of excised rat liver can be obtained using the technique of magic angle turning (MAT) at a sample spinning rate of 1 Hz. A variant of the phase‐corrected MAT (PHORMAT) pulse sequence that includes a water suppression segment was developed for the investigation. The spectral resolution achieved with PHORMAT approaches that obtained from a standard magic angle spinning (MAS) experiment at a spinning rate of several kHz. With such ultra‐slow spinning, tissue and cell damage associated with the standard MAS experiment is minimized or eliminated. The technique is potentially useful for obtaining high‐resolution 1H spectra in live animals. Magn Reson Med 47:829–836, 2002. © 2002 Wiley‐Liss, Inc.
Lack of the C‐terminal domain of nebulin in a patient with nemaline myopathy
Authors: Gurgel‐Giannetti J. , Bang M.‐L. , Reed U. , Marie S. , Zatz M. , Labeit S. , Vainzof M. 
Published: August 2002

AbstractThe most common autosomal recessive form of nemaline myopathy is due to mutations in the nebulin gene. Among eight patients studied, we identified one, a 14‐year‐old girl, with a specific pattern of diffuse rods in muscle fibers. Western blot analysis detected absence of the C‐terminal domain of nebulin. Protein analysis may represent a good screening method to direct molecular studies in the case of very large and complex genes such as the large 1298 kb nebulin gene. © 2002 Wiley Periodicals, Inc. Muscle Nerve 25: 000–000, 2002