bluuebunny/crossref_metadata_2025_split huggingface dataset:
Scattering by conducting sphere coated with chiral media
Authors: Yung Edward Kai‐Ning , Hu Bin‐Jie 
Published: October 2002

AbstractScattering of a plane wave with linear polarization by a chiral‐coating conducting sphere is presented. The expressions for the expansion coefficients of scattered fields and internal fields are obtained. The achiral‐coating and the bare sphere limiting cases for these formulas are examined. The monostatic and bistatic radar cross‐section (RCS) for three different chiral media: a lossless dielectric chirality, a loss dielectric chirality and a loss magnetic chirality are shown. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 288–293, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10586
Two‐port calibration of test fixtures with different test ports
Authors: Chen Zhen Yu , Wang You Lin , Liu Yu , Zhu Ning Hua 
Published: October 2002

AbstractThe open‐short‐load (OSL) method is very simple and widely used for one‐port test fixture calibration. In this paper, this method is extended, for the first time, to the two‐port calibration of test fixtures with different test ports. The problem of phase uncertainty arising in this application has been solved. The comparison between our results and those obtained with the SOLT method shows that the method established is accurate for practical applications. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 299–302, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10589
Analysis of microstrip spiral inductor by using iterative method
Authors: Mami A. , Zairi H. , Gharsallah A. , Baudrand H. 
Published: October 2002

AbstractAn efficient method based on the wave concept introducing a Fast Fourier Transformation on the wave‐guide environment Mode Fast Fourier Transformation (MFFT) for the investigation of a micro‐strip spiral inductor is presented in this paper. This method is used to calculate S‐parameters of an shielded microwave components including air bridges. The general formulation and implementation procedure of the method are described. The theory application is verified by a comparison with experimental data. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 302–306, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10590
Cost‐effective microcontrolled optoelectronic portable color identifier for visual impaired persons
Authors: Pena J. M. S. , Vázquez C. , Pérez I. , Quintana X. , Otón J. M. 
Published: October 2002

AbstractA hand‐held color‐identifier for blind, color‐blind and vision‐impaired people has been developed. Color data are obtained by balancing the relative intensities of RGB primaries. After a training period, the system is able to identify any arbitrary number of colors. The output is a spoken message, chosen from a preset list. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 309–310, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10592
Enhanced bandwidth microstrip patch antennas loaded with high permittivity dielectric resonators
Authors: Bijumon P. V. , Menon Sreedevi K. , Sebastian M. T. , Mohanan P. 
Published: October 2002

AbstractA novel technique for the bandwidth enhancement of conventional rectangular microstrip antenna is proposed in this paper. When a high permittivity dielectric resonator of suitable resonant frequency was loaded over the patch, the % bandwidth of the antenna was increased by more than five times without much affecting its gain and radiation performance. A much more improved bandwidth was obtained when the dielectric resonator was placed on the feedline. Experimental study shows a 2:1 VSWR bandwidth of more than 10% and excellent cross polarization performance with increased pass band and radiation coverage almost the same as that of rectangular microstrip antenna. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 327–330, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10597
A comparative study of modal dispersion characteristics of different types of concave‐lens‐shaped dielectric waveguides
Authors: Kumar N. , Srivastava S. K. , Ojha S. P. 
Published: October 2002

AbstractIn this paper, we present a comparative study of different types of concave lens‐shaped dielectric waveguides and a dielectric square waveguide. Using the point‐matching technique under the weak‐guidance approximation, a general characteristic equation has been derived and modal dispersion curves are obtained and interpreted. This waveguide cross section may be considered as a distortion of the square waveguide with a transverse compression at one pair of parallel sides in order to form the concave lens shape. Some important insights have been drawn about the comparison of their dispersion curves. It is observed that the cutoff value of the lowest order mode (Vc) increases with an increase in compression depth. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 337–342, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10600
Miniaturized hairpin superconducting filters for telecommunications applications
Authors: Barra M. , Cassinese A. , Cirillo M. , Jacob M. V. , Russo R. , Vaglio R. 
Published: October 2002

AbstractUsing miniaturized hairpin resonators and following the Chebychev model, we have designed and fabricated superconducting filters with a centre frequency of 2.2 GHz and a bandwidth of 5 MHz. The measured unloaded Q‐factor of the resonator fabricated on LaAlO3 using YBCO thin film is 47,000 at 60 K. Prototype filters with three and four poles have been realized by using Nb thin films. The measured performances do not show appreciable degradations up to 10 dBm. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 360–362, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10607
A novel differential equation model for a microstrip low‐pass filter
Authors: Hong J. S. , Liu Y. W. , Wang B. Z. , Mei K. K. 
Published: October 2002

AbstractHow to extract equivalent circuit parameters from full‐wave results is becoming an increasingly important aspect of microstrip filter design. In this paper, a microstrip low‐pass filter that is made of six stubs is analyzed by a novel differential equation whose coefficients are determined from full‐wave numerical solutions. In comparison with the conventional nonuniform transmission line equation, the novel differential equation has two additional terms—dependent series voltage and shunt current sources—which represent local radiation effect from discontinuities of the nonuniform transmission line itself. A whole structure of the above microstrip low‐pass filter can be regarded as a special case with a finite‐length non‐uniform transmission line. Thus, the novel differential equation can be used to analyze this kind of microstrip low‐pass filter. The novel differential equation established at a frequency of 10 GHz could cover a very wide frequency range from 6 GHz to 15 GHz. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 368–370, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10609
Novel periodically loaded multilayer resonators
Authors: Lalehparvar Laleh , Goussetis George , Budimir Djuradj 
Published: October 2002

AbstractIn this paper novel 3D periodic multilayer structures are investigated in MIC technology, and a periodically loaded multilayer waveguide resonant structure is proposed. This is a very compact structure and still maintains simple fabrication process. The resonator is designed at 10 and 28 GHz. The simulated results of this resonator, which is obtained from commercial FEM software package HFSS, are confirmed by experimental results. The experiments are based on the same resonator structure, only at 10 GHz. By modifying the conventional waveguide resonator, with the proposed structure, a minimum 30% shorter resonator can be achieved, which is very important in filter applications. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 374–375, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10611
Reverberation chamber with variable received signal amplitude distribution
Authors: Hallbjörner Paul 
Published: October 2002

AbstractIn standard reverberation chambers the measured signal have a Rayleigh distributed amplitude over different stirrer positions. In this paper, a method is presented by which the amplitude distribution can be varied from Rayleigh to Gauss, by introduction of a constant signal component. Thereby, the chamber can better simulate real mobile communication signal environments. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 376–377, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10612
A new 2D isotropic left‐handed metamaterial design: Theory and experiment
Authors: Marqués R. , Martel J. , Mesa F. , Medina F. 
Published: October 2002

AbstractA novel design for 2D isotropic left‐handed metamaterials is presented. One of the main advantages of our proposal is that all the metallizations are placed at parallel stratified planes. Thus, this design can be realized by means of the well known, commonly used planar technology. An analytical model is provided for the analysis of this new metamaterial. Numerical results obtained by using this model are validated by experimental simulations. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 405–408, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10620
Minimizing the variability of scattering coefficients in multihole directional couplers
Authors: Vicente‐Lozano M. , Rodríguez‐González J. A. , Ares‐Pena F. 
Published: October 2002

AbstractIn this paper, a technique to minimize the variability of the scattering coefficients in multihole directional couplers is shown. The technique also controls important features of the frequency response like bandwidth and minimum directivity. Several examples are presented to show the method's capabilities. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 412–413, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10622
Comments on Hilbert curve fractal antenna: A small resonant antenna for VHF/UHF applications
Authors: Best Steven R. 
Published: October 2002

Abstract © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 420–421, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10625
Authors' reply to “comments on Hilbert curve fractal antenna: A small resonant antenna for VHF/UHF applications”
Authors: Vinoy K. J. , Varadan V. K. 
Published: October 2002

Abstract © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 421, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10626
Inhibition of maximal voluntary contraction force by experimental muscle pain: A centrally mediated mechanism
Authors: Graven‐Nielsen Thomas , Lund Hans , Arendt‐Nielsen Lars , Danneskiold‐Samsøe Bente , Bliddal Henning 
Published: October 2002

AbstractMuscle weakness frequently accompanies conditions with musculoskeletal pain. It is not clear if this attenuation of force is due to peripheral or central processes. The effect of experimental muscle pain on maximal voluntary contraction torque and peripheral contractile properties was therefore assessed. Experimental muscle pain reduced the torque produced by isometric knee extension, but the contractile properties assessed by twitch interpolation were not affected. This indicates that force inhibition by muscle pain is centrally mediated. This has clinical implications for rehabilitation and training of patients with musculoskeletal pain. © 2002 Wiley‐Liss, Inc. Muscle Nerve 26: 708–712, 2002
Anomalous superficial radial nerve: A patient with probable autosomal dominant inheritance of the anomaly
Authors: Kuruvilla Abraham , Laaksonen Satu , Falck Björn 
Published: October 2002

AbstractThe sensory symptoms due to lesions of the superficial branch of the radial nerve are usually limited to the dorsolateral area of the hand. We describe a 40‐year‐old woman who presented with numbness of the dorsomedial aspect of the right hand following arthroplasty of the wrist. Clinically, the sensory loss suggested a lesion of the dorsal branch of the ulnar nerve. However, nerve conduction studies showed that the sensory loss was due to a lesion of a branch of the superficial branch of the radial nerve. The patient had bilateral, anomalous innervation of the dorsum of the hand—the dorsal branch of the ulnar nerve could not be demonstrated with nerve conduction techniques and the superficial branch of the radial nerve innervated most of the dorsum of the hand. Antidromic stimulation of the dorsal branch of the ulnar nerve and superficial branch of the radial nerve with paired surface recording of sensory nerve action potentials from the dorsolateral (radial side) and dorsomedial (ulnar side) hand is useful for evaluating this anomaly. Our patient had two children, one of them with a similar anomaly. This suggests an autosomal dominant inheritance of the anomaly. © 2002 Wiley Periodicals, Inc. Muscle Nerve 26: 716–719, 2002
Motion of the foot and ankle during the stance phase in rats
Authors: Varejão Artur S. P. , Cabrita António M. , Meek Marcel F. , Bulas‐Cruz José , Gabriel Ronaldo C. , Filipe Vitor M. , Melo‐Pinto Pedro , Winter David A. 
Published: October 2002

AbstractComputerized analysis of rat gait is becoming an invaluable technique used by some peripheral nerve investigators for the evaluation of function. In this article we describe the use of a biomechanical model of the foot and ankle that allows a quantitative assessment and description of the ankle angle, reflecting plantarflexion and dorsiflexion during the stance phase of gait. Kinematic data of 144 trial walks from 36 normal rats were recorded with a high‐speed digital image camera at 225 images per second. The ankle angular changes associated with the specific temporal events of foot placement on the ground through the stance phase were assessed. The information obtained was used to propose a new subdivision of the stance phase in the rat into three major components. This approach will provide a helpful research tool to analyze gait data that rely on the accurate determination of spatiotemporal foot events. © 2002 Wiley Periodicals, Inc. Muscle Nerve 26: 630–635, 2002
Skeletal muscle fiber function and rate of disease progression in amyotrophic lateral sclerosis
Authors: Krivickas Lisa S. , Yang Jung‐In , Kim Sang‐Kyu , Frontera Walter R. 
Published: October 2002

AbstractThe contractile properties of single muscle fibers reflect the functional status of muscle at the cellular level and have not been described in amyotrophic lateral sclerosis (ALS). Chemically skinned single muscle fibers (n = 173), obtained by needle biopsy from six men with ALS, were activated with Ca2+, allowing maximal force measurements and specific force (SF) estimates. Maximum unloaded shortening velocity (Vo) was determined using the slack test. The results were compared with muscle from healthy controls. Markers of disease progression included rate of change of ALS functional rating scale score, rate of change of forced vital capacity, and disease duration. Compared with controls, ALS patients had decreased whole muscle SF (measured by a combination of computerized tomography and isokinetic testing) but normal single fiber SF. The Vo was greater for type I fibers in ALS. Patients with slower disease progression had increased single fiber size and a high percentage of hybrid fibers (expressing multiple myosin heavy chain isoforms). A needle biopsy obtained at the time of ALS diagnosis may assist with predicting rate of disease progression. © 2002 Wiley Periodicals, Inc. Muscle Nerve 26: 636–643, 2002
Near‐nerve needle sensory conduction study of the medial calcaneal nerve: New method and report of four cases of medial calcaneal neuropathy
Authors: Seo Jeong‐Hwan , Oh Shin J. 
Published: October 2002

AbstractThere has been one previously published antidromic method for studying medial calcaneal nerve (MCN) conduction. However, the origin of the compound nerve action potentials (CNAPs) with this technique is uncertain because of the antidromic nature of stimulation. We report a new orthodromic method for MCN conduction study using the near‐nerve needle technique. In 35 normal controls, maximum nerve conduction velocity (NCV) and negative‐peak NCV of MCN were 42.4 ± 3.9 m/s and 33.6 ± 3.0 m/s, respectively. The amplitude of the CNAP was 4.1 ± 2.2 μV. We also report four cases of medial calcaneal neuropathy, three of which were confirmed by this technique. We conclude that the present technique is capable of recording the sensory nerve action potentials of MCN in isolation and confirming the diagnosis of medial calcaneal neuropathy electrophysiologically. © 2002 Wiley Periodicals, Inc. Muscle Nerve 26: 654–658, 2002
Template elastic‐plastic computations in geomechanics
Authors: Jeremić Boris , Yang Zhaohui 
Published: October 2002

AbstractIn this paper we present a new approach to computations in elasto‐plastic geomechanics. The approach is based on the object oriented design philosophy and observations on similarity of most incremental elastic–plastic material models. This new approach to elastic–plastic computations in geomechanics allows for creation of template material models. The analysis of template material models will in turn allow for an easy implementation of other elastic–plastic material models based on the object oriented design principles. Furthermore we present some illustrative implementation details. Finally we present analysis results that emphasize features of template elastic–plastic computations in geomechanics. Copyright © 2002 John Wiley & Sons, Ltd.
Analytical and numerical investigation of uniqueness and localization in saturated porous media
Authors: Zhang H.W. , Schrefler B.A. 
Published: October 2002

AbstractThis paper presents first the applications of uniqueness and strain localization analysis of saturated porous media, where localization of deformation into well defined narrow zones in a saturated porous medium is studied in terms of discontinuous bifurcation theory. A generalized plasticity constitutive model and a Mohr–Coulomb model are used in both the theoretical and numerical analyses of shear band formations. The critical hardening moduli and shear band angle for localization are computed, and quantitative results are given for both constitutive models. Numerical results previously obtained and new ones are confirmed by this analytical and numerical investigation. Copyright © 2002 John Wiley & Sons, Ltd.
Analysis of steady‐state heat transfer through mid‐crustal vertical cracks with upward throughflow in hydrothermal systems
Authors: Zhao Chongbin , Hobbs B. E. , Mühlhaus H. B. , Ord A. , Lin Ge 
Published: October 2002

AbstractWe conduct a theoretical analysis of steady‐state heat transfer problems through mid‐crustal vertical cracks with upward throughflow in hydrothermal systems. In particular, we derive analytical solutions for both the far field and near field of the system. In order to investigate the contribution of the forced advection to the total temperature of the system, two concepts, namely the critical Peclet number and the critical permeability of the system, have been presented and discussed in this paper. The analytical solution for the far field of the system indicates that if the pore‐fluid pressure gradient in the crust is lithostatic, the critical permeability of the system can be used to determine whether or not the contribution of the forced advection to the total temperature of the system is negligible. Otherwise, the critical Peclet number should be used. For a crust of moderate thickness, the critical permeability is of the order of magnitude of 10−20m2, under which heat conduction is the overwhelming mechanism to transfer heat energy, even though the pore‐fluid pressure gradient in the crust is lithostatic. Furthermore, the lower bound analytical solution for the near field of the system demonstrates that the permeable vertical cracks in the middle crust can efficiently transfer heat energy from the lower crust to the upper crust of the Earth. Copyright © 2002 John Wiley & Sons, Ltd.
Hindbrain glucoprivic inhibition of the proestrus lutenizing hormone surge in the female rat is attenuated by exogenous lactate administration
Authors: Briski Karen P. 
Published: October 2002

AbstractCentral glucose availability is a critical monitored variable in the regulation of reproductive neuroendocrine function. While current studies implicate the periventricular caudal brainstem as a source of signaling of decreased availability of catabolic intermediates and/or glycolytic end products, the mechanisms by which local metabolic ‘sensors’ signal diminished glucose utilization are not clear. The present experiments investigated whether fourth ventricular infusion of the aerobic catabolic substrate, lactate, attenuates glucoprivic suppression of luteinizing hormone (LH). Cyclic female rats were injected at 13.00h on proestrus with the glucose antimetabolite, 2‐deoxy‐D‐glucose (2DG; 50 vs. 150ug), or vehicle into the rostral fourth ventricle. Additional proestrus animals were treated by continuous fourth ventricular infusion of 10.0 µM lactate/hr or vehicle, initiated prior to ip injection of 400mg 2DG/kg bw or saline. Serial blood samples were obtained hourly during proestrus afternoon for radioimmunoassay of plasma LH. The results demonstrate a reduction in the LH surge following icv 2DG administration, while showing that fourth ventricular infusion of lactate reversed inhibition of hormone release by systemic antimetabolite administration. These findings support the view that hindbrain signaling of glucose metabolic dysfunction initiates neural mechanisms that inhibit the proestrus LH surge, and that lactate utilization may be monitored as an indicator of local cellular energy stasis.
Brain‐specific carboxypeptidase B: selective down‐regulation in ependymal cell by irradiation and altered β‐amyloid processing
Authors: Kawabe Tetsuya , Sasaki Ryohei , Nishimura Hideki , Soejima Toshinori , Matsuyama Shogo , Sugimura Kazuro , Matusumoto Akira 
Published: October 2002

AbstractHuman brain carboxypeptidase B (HBCPB) is a brain protease expressed in a group of neuronal perikarya and ependymal cells, and cleaves β‐amyloid precursor protein (APP) in vitro, generating β‐amyloid (Aβ)‐bearing C‐terminal fragment of APP. To explore its physiological function, response to external stress, such as ionizing radiation, and expression in mouse brain were studied. Mouse head was irradiated at 10 Gy, then brains were excised before or after 1h until 9 d of irradiation. They were analyzed using TUNEL assay and anti C14‐module antibody which detects epitopes unique to HBCPB, and western analysis. The mouse HBCPB‐homologue cleaved mouse brain APP in vitro. Morphological study indicated its identical distribution to HBCPB. During 2 h after irradiation, the HBCPB‐homologue expression in edendymal cells, but not in neurons, decreases transiently, and recovers within 4 h. Concomitantly, processing of APP is altered, increasing generation of the C‐terminal 12 kDa fragment. Since APP participates in cellular response to tolerance in CNS, this finding suggests that radiation‐induced APP processing and differential response in its expression between ependymal cells and neurons are associated with important physiological function in CNS.