bluuebunny/crossref_metadata_2025_split huggingface dataset:
Equivalent circuit of an inside cylindrical microstrip GAP discontinuity
Authors: And Jui‐Han Lu , Wong Kin‐Lu 
Published: July 2007

AbstractThe equivalent circuit of the microstrip gap discontinuity of a cylindrical microstrip line mounted inside a cylindrical surface is studied using a full‐wave formulation and a moment‐method calculation. The equivalent circuit is modeled as a π network consisting of the equivalent gap admittance and the equivalent open‐end admittance, which are determined from the reflection and transmission coefficients from the gap discontinuity. Typical theoretical results are calculated and presented. © 1995 John Wiley & Sons, Inc.
A FDTD networking approach to meshed‐strip lines
Authors: Wang Bing‐Zhong 
Published: July 2007

AbstractA finite‐difference‐time‐domain (FDTD) networking approach is applied to the full‐wave analysis of the transmission properties of meshedstrip lines. The network formulation incorporated with the FDTD method leads to a large saving in computation time and computer memory. © 1995 John Wiley & Sons, Inc.
Characterization of fiber‐optic microwave link with optoelectronic upconverter using impulse response identification system
Authors: Liu Qing Z. , Davies Robert , MacDonald R. Ian 
Published: July 2007

AbstractA fiber‐optic microwave link with a monolithic integrated optoelectronic upconverter has been characterized experimentally using the impulse response identification system (IRIS). It is shown that a low‐cost optical system performs signal transmission, detection, and conversion, while introducing minimal signal distortion over that of standard radio modulation devices. This offers potential for a low‐cost solution to the problem of distribution of future microwave and millimeter‐wave signals in building for PCN and wireless LAN applications. © 1995 John Wiley & Sons, Inc.
Analysis of the probability density of the detection signal in an optical coherent system from measurement results using DFB laser diodes
Authors: Ziemann O. , Rauschenbach P. , Irmer R. , Freund R. , Reimer W. 
Published: July 2007

AbstractThis article presents the analysis of the probability density of the envelope of the intermediate‐frequency signal in an optical coherent system. The electrical components were replaced by idealized numerical models, in order to be able to compare the results with theoretical results from the literature. The results from this work agree well with numerical calculations. A numerical simulation will be given in this article. The results make it possible to give much better statements about the statistical properties of laser phase noise. © 1995 John Wiley & Sons, Inc.
Experimental performance comparison of analog and digital correlators in optical spread‐spectrum systems
Authors: Al‐Raweshidy H. S. 
Published: July 2007

AbstractThis article evaluates the experimental performance comparison between analog and digital correlation techniques in optical spread‐spectrum systems. The digital correlation achieved a 3‐cm spatial resolution, in comparison with the analog case of 20 cm. To the author's best knowledge this is the best resolution reported to date with a noncoherent system. The advantages of the approach are also discussed with reference to synchronization performance. © 1995 John Wiley & Sons, Inc.
Efficient calculation of reaction integrals for aperture coupled cavity resonators
Authors: Singer M. , Friedsam G. L. , Biebl E. M. 
Published: July 2007

AbstractAn efficient method for the calculation of the field distribution in aperture coupled cavity resonators is proposed. The coupling between the resonator and the surrounding free space is accomplished by means of an aperture in one of the cavity walls. This concept is very attractive for integrated microwave and miilimeter‐wave circuits, because active elements can be integrated within the aperture. The field distribution is solued using Galerkin's method. For rooftop basis functions the reaction integrals are analytical calculated in the space domain for each cavity mode. A criterion is derived that gives the minimum number of cavity modes depending on the dimensions of the cavity and the size of the discretization cells. Eficiency and accuracy of the proposed method are demonstrated for slot coupled cavity resonators. The numerical results are compared with measurements. © 1995 John Wiley & Sons, Inc.
Electromagnetic scattering from a circular cylinder with an anisotropic surface impedance due to an obliquely incident plane wave
Authors: Kishk Ahmed A. , Kildal Per‐Simon 
Published: July 2007

AbstractThe series solution of the electromagnetic scattering from a circular cylinder with an anisotropic surface impedance due to an arbitrary plane‐wave incidence is given. The solution can be used as a canonical problem, and for validation of more general numerical methods or for exact calculations of the cylinder with the actual dimension of the realization of the surface impedance. Examples are given for verification purposes. © 1995 John Wiley & Sons, Inc.
Iterative angular‐mode inversion of a conducting cylinder
Authors: Park Seon‐Kyu , Park Cheon‐Seok , Ra Jung‐Woong 
Published: July 2007

AbstractFor the iterative reconstruction of the shape function of a two‐dimensional conducting object, the angular modal representation of the scattered field gives effective choice of measurement points especially in the presence of noise in the scattered field. It is shown that the object center and its initial shape may be estimated from the effective propagating modes of the measured scattered field. By employing N effective propagating modes excluding the exponentially small higher‐order modes, numerical calculation shows that the reconstruction of the shape function with 2N unknowns is possible. When the noise is present, the characteristics of the cost function show that the effective propagating modes with multiple incident waves eliminating the shadow region of the object are needed for the stable inversion. © 1995 John Wiley & Sons, Inc.
Electromagnetic scattering by some composite bianisotropic eccentric cylinders
Authors: Wenyan Yin 
Published: July 2007

AbstractThe scattering of a TM‐polarized plane wave by some bianisotropic eccentric cylinders is considered. Such composite structures include a one‐layer bianisotropic eccentric cylindrical shell, a two‐layer bianisotropic eccentric cylinder, and an impedance cylinder embedded in an eccentric bianisotropic cylinder, respectively. An algorithm based on the boundary value technique combined with the addition theorem for cylindrical functions is constructed, and is also suitable for the obliquely incident case. Numerical results are presented to show the different effects of various geometrical and constitutive parameters on the copolarized and cross‐polarized bistatic echo widths of bianisotropic eccentric cylinders. © 1995 John Wiley & Sons, Inc.
Analysis of a coupled coplanar waveguide for MMIC applications
Authors: Zhu N. H. , Qiu W. , Pun E. Y. B. , Chung P. S. 
Published: July 2007

AbstractThe article presents a computational method for calculating the electric potential and field distributions in a coupled coplanar waveguide with finite electrode thickness. This method provides a simple and fast approach to the quasistatic analysis of the structures. The same structure with infinitely thin electrodes is also analyzed using conformal‐mapping techniques, and excellent agreement of the results is obtained between the two methods. © 1995 John Wiley & Sons, Inc.
Microwave properties of traveling‐wave InGaAs/InGaAlAs quantum‐well optical waveguide modulators
Authors: Mihailidi M. M. , Zucker J. E. , Feuer M. D. , Khan M. N. , Chang T. Y. , Sauer N. J. 
Published: July 2007

AbstractWe analyze and measure the electrical properties of a hybrid coplanar/ microstrip traveling‐wave optical modulator containing an InGaAs/InAlAs quantum‐well electron transfer structure. S‐parameter measurements to 20 GHz reveal the microwave refractive index and microwave loss as a function of waveguide geometry. These experiments allow us to project electro‐optical modulation bandwidths in excess of 40 GHz. © 1995 John Wiley & Sons, Inc.
Bandpass distributed amplifier design guidelines
Authors: Prasad S. N. , Kajjam Ashok , Li Zhi M. 
Published: July 2007

AbstractA systematic approach to the design of GaAs FET bandpass distributed amplifiers is presented for the first time. The graphical design procedures presented enable one to examine the trade‐offs between the design variables and arrive at the appropriate design for a specified gain and bandwidth. © 1995 John Wiley & Sons, Inc.
Broadside‐coupled coplanar waveguide: Studies of hybrid modes and dominant‐mode operation
Authors: Nguyen Cam 
Published: July 2007

AbstractHybrid modes in the broadside‐coupled coplanar waveguide (CPW) are examined for the first time using the full‐wave spectral‐domain method. Various numerical results for the characteristic impedances and effective dielectric constants are obtained to study the behaviors of the dominant and higher‐order modes as well as to assess the operating range of the dominant propagation modes in this structure. Criteria to enhance the dominant‐mode frequency range are also discussed. Over the dominant‐mode frequency range, the dispersion is low. However, variation of the characteristic impedances is more pronounced than that of the effective dielectric constants, indicating the need for dynamic characteristic impedances for accurate circuit designs. The results in the low‐frequency limit agree well with those obtained using a quasistatic approach. Also, the calculated effective dielectric constants of the dominant odd mode match closely the existing data for the effective dielectric constants of a shielded conductor‐backed CPW. © 1995 John Wiley & Sons, Inc.
Address recognition in all‐optical packet switching by FWM in semiconductor amplifiers
Authors: D'Ottavi A. , Iannone E. , Scotti S. 
Published: July 2007

AbstractIn this Letter we propose a novel technique for all‐optical address recognition in all‐optical packet switching, based on wide‐deviation FSK with direct detection and FWM in semiconductor optical amplifiers. The probability of erroneous recognition is evaluated theoretically to assess the feasibility of this solution. © 1995 John Wiley & Sons, Inc.
Hybrid and monolithic tunable recursive filter design at microwaves including a new stability analysis procedure
Authors: Delmond M. , Billonnet L. , Jarry B. , Guillon P. 
Published: July 2007

AbstractActive filter structures are proposed using a low‐frequency transversal and recursive approach. Separate studies of the different functional blocks lead to the design of nontunable and tunable original structures for which we present both simulated and measured results in MMIC technology. We also validate a new stability analysis method developed in [1], by comparing the normalized determinant function to the classical recursive approach. © 1995 John Wiley & Sons, Inc.
Field‐of‐view overlap effects in helmet‐mounted night‐vision systems
Authors: Alam M. S. , Karim M. A. , Zheng S. H. , Iftekharuddin K. M. 
Published: July 2007

AbstractThe effect of increasing the field of view by partial‐overlap technique was investigated experimentally for both static and moving images. A number of factors, such as binocular rivalry, suppression, image breakup, resolution, and search time were investigated. The experimental results show that the binocular overlap area should be greater than 40% for the display to be comfortable to the eye. Image breakup effect was found to be predominant for static images but negligible for moving images. © 1995 John Wiley & Sons, Inc.
Electromagnetic scattering from slot antennas on waveguides with arbitrary terminations
Authors: Chen Ji , Jin Jianming 
Published: July 2007

AbstractA numerical technique is presented to study the scattering of electromagnetic waves from slot antennas fed by waveguides with arbitrary terminations. The technique employs the method of moments in conjunction with the entire‐domain basis functions to solve the integral equation derived for the field in the slots. The validity and accuracy of the proposed technique are demonstrated by comparing the numerical results to the solution obtained using the finite‐element method. © 1995 John Wiley & Sons, Inc.
New velocity‐matching technique for integrated‐optic traveling‐wave modulators
Authors: Fushen Chen 
Published: July 2007

AbstractMultisection electrodes are proposed with the same interaction length but different transmission lengths from a microwave input to the interaction sections, so that the proper microwave transmission delay can provide exactly the same polarity of microwave voltage for each section. Therefore, the electro‐optically induced phase shift in each of the electrode sections can always add in phase, and several sections can be used to reduce the required drive voltage at the design frequency. © 1995 John Wiley & Sons, Inc.
Electromagnetic scattering from an anisotropically impedant cylinder immersed in a chiral medium
Authors: Shanker Balasubramaniam 
Published: July 2007

AbstractWe first obtain solutions in terms of partial waves for scattering from an anisotropic impedance cylinder. The impedance boundary condition takes a very general form; n × (n × E) = Z n × H, where the elements of the impedance dyadic Z are arbitrary. Using these expression, we derive the scattering response of such a cylinder coated with a chiral medium for both the TE and TM polarizations of the incident wave. As we have used a generalized impedance dyadic Z, the solution presented here is very general and can accommodate a number of reductions. © 1995 John Wiley & Sons, Inc.
A fast multiresolution moment‐method algorithm using wavelet concepts
Authors: Kim Hyeongdong , Ling Hao 
Published: July 2007

AbstractA fast multiresolution moment‐method algorithm is developed based on the spectral‐domain wavelet concept. The computational savings are achieved by taking advantage of the multiscale feature of the spectral‐domain Green's function. It is shown that the multiresolution algorithm leads to reduced computational complexity in the matrix‐vector multiplication operation. © 1995 John Wiley & Sons, Inc.
Quartic perfectly matched layers for dielectric waveguides and gratings
Authors: Chen J. C. , Li K. 
Published: July 2007

AbstractIn some cases, perfectly matched layers (PML) with quartic conductor profiles are superior to the traditional quadratic gradations. This PML boundary condition can be applied to gratings; it does not suffer from Fabry‐Perot fringes and is not swamped by noise, unlike the absorbing boundary condition. © 1995 John Wiley & Sons, Inc.
On the reciprocity factor for shielded microstrip
Authors: Livernois Thomas G. 
Published: July 2007

AbstractNumerical results relating off‐diagonal elements of the impedance matrix [Z] for a two‐port waveguide junction are derived based on a general waveguide circuit theory [1] and a rigorous space‐domain approach. The junction between a coaxial line and a lossy shielded microstrip line is considered. Data indicate that even when the waveguides are composed of reciprocal media, the forward and reverse transmission coefficients are not necessarily equal. © 1995 John Wiley & Sons, Inc.
Dominant mode field solutions in a chiral‐filled rectangular waveguide
Authors: Samant Abhay R. , Whites Keith W. 
Published: July 2007

AbstractThere are two principle topics of this article. The first is the development of a numerical technique to compute the field patterns within a longitudinally invariant rectangular waveguide filled with a chiral material. The finite‐difference method is used because of the complex nature of the solution to the chiral rectangular waveguide. Based on these field plots, a simple approximate series solution for the dominant mode is proposed for these guided‐wave structures and verification comparisons are made. © 1995 John Wiley & Sons, Inc.
Electromagnetic scattering by nonlinear dielectric cylinders with non‐kerr‐like nonlinearities
Authors: Caorsi Salvatore , And Andrea Massa , Pasterino Matteo 
Published: July 2007

AbstractIn this letter, electromagnetic scattering by nonlinear dielectric cylinders under transverse magnetic illumination is considered. The nonlinearity is assumed to be so weak as to allow the application of an iterative approach based on the distorted‐wave Born approximation. The bistatic and back‐scattering radar cross sections per unit length are computed. The key feature of the Letter is the use of nonlinearities represented by models different from previously assumed Kerr‐like ones. In particular, we consider nonlinearities that are of the saturated and are characterized by power laws. © 1995 John Wiley & Sons, Inc.
Performance analysis of cellular mobile communicatons over multistar ring fiberoptic/coaxial catv networks
Authors: Lee Yang‐Han , Lai Eugene , Hsieh Ching‐Tang 
Published: July 2007

AbstractThe embedded hybrid fiber‐optic/coaxial CATV network can provide cellular mobile communications with a star ring fiber‐optic network to distribute broadcasting cable TV programs and to provide the transmission of a bidirectional wireless signal. There are two lasers at the head end. The down‐link laser is split into two parts. One part is the local oscillator for the up‐link coherent detection, and the other part is externally modulated by the combined TV and wireless signals. The up‐link laser is connected to the ring network with the cascaded phase modulators scheme. For the location neighborhood and frequency reuse, we may apply the multistar ring CATV cellular network with the distance between the head end and the first‐level hub of 5 km and the distance between the first‐level hub and the second‐level hub of 0.5 km. The total hub number of 42 for the multistar ring system can support 34,860 wireless users for the IS‐54 system with frequency reuse number of 7 covering an area of radius 5 km. © 1995 John Wiley & Sons, Inc.
Generalized multipole technique for electromagnetic scattering by arbitrary‐shaped two‐dimensional anisotropic objects
Authors: Zhang Ming , Shu Yong‐Ze 
Published: July 2007

AbstractThe generalized multipole technique (GMT) is applied successfully to obtain electromagnetic scattering from an arbitrary‐shaped two‐dimensional anisotropic object. The results obtained for circular and square anisotropic cylinders are given along with validations obtained via an alternative method. © 1995 John Wiley & Sons, Inc.
Polypharmacy among people with rheumatoid arthritis: the role of age, disease duration and comorbidity
Authors: Treharne G. J. , Douglas K. M. J. , Iwaszko J. , Panoulas V. F. , Hale E. D. , Mitton D. L. , Piper H. , Erb N. , Kitas G. D. 
Published: July 2007

AbstractBackground: People with rheumatoid arthritis (RA) often have comorbidities with associated disability and complex medication regimens. Little published evidence exists about why people with RA require so many medications, although it is logical to hypothesize that this may relate to older age, longer duration of RA, more active RA, worse functional disability and a greater number of comorbidities.Objectives: We set out to quantify polypharmacy in RA and identify its predictors in an observational cohort.Methods: The case notes of 348 people receiving secondary care for RA were reviewed to record polypharmacy. The 28‐joint Disease Activity Score (DAS28) was calculated and the Health Assessment Questionnaire (HAQ) and the Self‐administered Comorbidity Questionnaire (SCQ) were completed.Results: The mean total number of medications was 5.39, with a maximum of 16; of these, a mean of 2.41 medications were directly for RA. A mediational relationship was identified: older age and longer RA duration were significant predictors of a greater total number of medications, but these relationships were explained by the greater number of comorbidities in older participants and those with longer RA duration. Polypharmacy was not related to RA activity or functional disability.Conclusions: Polypharmacy is common among people with RA and associates with older age and longer RA duration through a greater number of comorbidities. Regular review of the full treatment plan of individuals with RA by pharmacists and other health professionals specializing in rheumatology, to weigh the benefits and risks of each medication and their interactions in light of RA activity and comorbidities, is advocated. Copyright © 2007 John Wiley & Sons, Ltd.
Disseminated sporotrichosis presenting with granulomatous inflammatory multiple mononeuropathies
Authors: Mauermann Michelle L. , Klein Christopher J. , Orenstein Robert , Dyck P. James B. 
Published: July 2007

AbstractWe describe a case of sporotrichosis that disseminated to involve multiple nerves after initiation of immunosuppressive therapy and then precipitously worsened after withdrawal of therapy. This case illustrates that multiple mononeuropathies are not always caused by vasculitis, and a correct pathological diagnosis should be established before treatment. Based on clinical and pathological features, the mechanism of neuropathy may have been due to either direct nerve infection or a bystander effect of inflammatory/immune damage or, perhaps more likely, to both mechanisms. Muscle Nerve, 2007
Vitamin B12 and methylmalonic acid levels in patients presenting with polyneuropathy
Authors: Nardin Rachel A. , Amick Amy N.H. , Raynor Elizabeth M. 
Published: July 2007

AbstractThis study was designed to determine the prevalence of definite vitamin B12 deficiency (defined as ≤240 pg/ml) and possible vitamin B12 deficiency (defined as >240 pg/ml and a methylmalonic acid [MMA] level >243 nmol/L) in patients with polyneuropathy and to determine whether patients in both groups respond to vitamin B12 repletion. We performed a retrospective cohort study of 581 patients presenting with polyneuropathy over a 2‐year period; 4% had definite vitamin B12 deficiency and 32% had possible deficiency as the sole or contributing cause for their polyneuropathy. For those who received treatment with vitamin B12, subjective improvement was seen in 87% with definite and in 43% with possible deficiency. Possible vitamin B12 deficiency, defined as an elevated MMA level, is a common finding in patients with polyneuropathy and treatment of these patients with vitamin B12 may lead to clinical improvement. Muscle Nerve, 2007
The invisible workforce: How to align contract and temporary workers with core organizational goals
Authors: Jacobs Richard A. 
Published: July 2007

AbstractIf combined in a line entry, outsource, contract, and temporary work would be the largest element of many private and public organizations' operating statements. These type of employment arrangements are among the fastest growing portions of the workforce, now representing about one in every five workers. Yet despite its growth, outsourcing is frequently poorly controlled, high in cost, and a drain on quality and service performance. Outsourcing can, however, be successfully managed. This article illustrates the philosophies that managers must adopt and the steps they must take to help turn outsourcing into a competitive advantage for their organizations.
Strategic quality management: Turning the spotlight on strategic as well as tactical issues
Authors: Recardo Ronald J. 
Published: July 2007

AbstractSeeking to improve their performance and product and/or service quality, many organizations focus exclusively on tactical quality issues. This is often done at the expense of the fundamental strategic direction of the organization. To avoid the mediocre results that sometimes stem from such poorly conceived total quality management programs, managers must learn to design, implement, and evaluate a strategic quality management effort.