bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bent rectangular core waveguides: An accurate perturbation approach
Authors: Kumar Arun , Gallawa R. L. 
Published: July 2007

AbstractWe discuss a method of evaluating the effective indices of quasimodes of a bent rectangular core waveguide taking into account the correct dielectric constant of the corner regions, which is ignored in earlier methods. At small bend curvatures and low V values, the corner regions contribute much more to the effective index change than the bending itself. © 1994 John Wiley & Sons, Inc.
Analytical approach of noise‐figure dependence on temperature for microwave FET
Authors: Gobert Y. , Salmer G. 
Published: July 2007

AbstractThis article presents a simplified theoretical approach of noise behavior about microwave FETs. An analytical formulation regarding the noise‐figure dependence on temperature is proposed and validated by experimental results. This expression takes into account the evolutions with temperature of the small‐signal equivalent circuit. © 1994 John Wiley & Sons, Inc.
A modified strip grating with dual periodicity for RCS reduction
Authors: Stephen D. Saji , Mathew Thomaskutty , Mohanan P. , Nair K. G. 
Published: July 2007

AbstractElimination of specular reflection over a wide range of aspect angles for TE polarization by a strip grating surface of two‐dimensional periodicity is reported. This overcomes the main disadvantage of conventional strip grating, which eliminates specular reflection for a single angle of incidence only. The structure reported here may find wide application in reduction of the radar cross section of targets. © 1994 John Wiley & Sons, Inc.
Phase sensitivity of an optical fiber ring resonator with a collinear 3 × 3 coupler
Authors: Ja Y. H. 
Published: July 2007

AbstractUnder study is the phase sensitivity of a Type 1 optical fiber ring resonator with a collinear (planar) 3 × 3 fiber coupler, where the three fibers inside the coupler lie in the same plane. It is found that this fiber ring resonator has one of the highest phase sensitivities among many passive fiber ring and loop resonators with one to two 2 × 2 or 3 × 3 fiber couplers. A comparison between the phase sensitivities of this ring resonator and a ring resonator with a 2 × 2 coupler is also made. © 1994 John Wiley & Sons, Inc.
New series‐fed traveling‐wave array
Authors: Alaeddine A. , Rammal M. , Reineix A. , Jecko B. 
Published: July 2007

AbstractA method of designing a series‐fed microstrip traveling‐wave array to produce a shaped pattern is described. A theoretical analysis of the traveling‐wave element is given and experimental results are presented. High efficiency and good directivity have been observed on the array. © 1994 John Wiley & Sons, Inc.
Plane‐wave propagation in an anisotropic chiral medium with isotropic permittivity and permeability
Authors: Viitanen Ari J. , Lindell Ismo V. 
Published: July 2007

AbstractPlane‐wave propagation in an anisotropic chiral medium with isotropic permittivity and permeability and symmetric chirality dyadic is considered. The eigenvalue equation is formed and the wave numbers and the corresponding eigenpolarizations are given. The results make possible the construction of a polarization transformer in which one can also choose the handedness. © 1994 John Wiley & Sons, Inc.
Electromotive force technique applied to the design of planar dielectric antennas with low side lobes
Authors: Kalinichev Victor I. , Kuranov Yury V. 
Published: July 2007

AbstractThe diffraction problem of a dominant surface mode scattering by a finite number of metal strips placed on a surface of a planar dielectric waveguide is considered. The electromotive force technique is utilized, and results concerning the analysis and design of beam antennas with low side‐lobe level at millimeter wavelength are presented. © 1994 John Wiley & Sons, Inc.
Numerical simulation for vertical cavity surface emitting lasers with external optical feedback
Authors: Zhang Jian‐Ping 
Published: July 2007

AbstractThe stability of vertical cavity surface emitting lasers with distant external optical feedback is analyzed numerically by using the rate equation model. Results for the different cavity designs are compared. The effects of the nonlinear gain coefficient on RIN and spectral linewidth is investigated. The results can be considered as a guideline to the laser design. © 1994 John Wiley & Sons, Inc.
Forces on solitons in finite, nonlinear, planar waveguides
Authors: Ramos J. I. , Villatoro F. R. 
Published: July 2007

AbstractThe forces acting on and the energies of solitons governed by the nonlinear Schrödinger equation in finite planar waveguides with periodic and with homogeneous Dirichlet, Neumann, and Robin boundary conditions are determined by means of a quantum analogy. It is shown that these densities have S‐shaped profiles and increase as the hardness of the boundary conditions increases. © 1994 John Wiley & Sons, Inc.
Application of a variational method for inverting the potential profile
Authors: Shi Xiaowei , Han Yiping , Liang Changhong 
Published: July 2007

AbstractThe potential profile of the one‐dimensional Schrödinger equation may be inverted from the reflection coefficient. For example, the famous Gel'fand‐Levitan equation shows their relation. But, in the general case, GL equation may hardly be solved exactly. Based on the Hulthén‐Kohn variational method for calculating the reflection coefficient, a closed‐form approximation formulation is used in this Letter for inverting the potential profile. Inversion examples show that this formulation works better than the famous modified Born approximation. © 1994 John Wiley & Sons, Inc.
Absorption enhancement of scattering of electromagnetic waves by dielectric cylinder clusters
Authors: Au W. C. , Kong J. A. , Tsang L. 
Published: July 2007

AbstractNumerical results of the absorption cross sections of dielectric cylinder clusters are presented. They show that the absorption of such clusters can be several times larger than the incoherent sum of the absorption of its components. The absorption enhancement of the cluster is due to coherent mutual interaction between its components and can play an important role in remote sensing, particularly in passive remote sensing. © 1994 John Wiley & Sons, Inc.
Scattering by 2d strips using an asymptotic hybrid formulation combining the method‐of‐moments and physical‐optics techniques
Authors: Sullivan Anders , Carin Lawrence 
Published: July 2007

AbstractFrequency‐domain plane‐wave scattering from perfectly conducting two‐dimensional strips is analyzed by a hybrid formulation combining the method of moments (MOM) and physical optics (PO). Asymptotic techniques are employed to evaluate many of the impedance matrix integrals. Comparisons are made with other MOM algorithms. A significant reduction in CPU time is achieved. © 1994 John Wiley & Sons, Inc.
Flattening and reversing of resonant curves in an s‐shaped two‐coupler optical fiber‐ring resonator
Authors: Ja Y. H. 
Published: July 2007

AbstractTwo special characteristics of an S‐shaped two‐coupler optical fiber‐ring resonator are studied. The first is that the resonant curve of the transmitted (or the reflected) output intensity can change from a channel‐passing type to a channel‐blocking type under certain conditions. The second is the flattening of the blocking band of the transmitted output intensity at full resonance when the intensity coupling coefficient of any one of the two 2 × 2 fiber couplers is relatively large. © 1994 John Wiley & Sons, Inc.
Harmonic bandpass detection of tdm signals
Authors: McGinn V. P. , Reis R. R. 
Published: July 2007

AbstractA time division multiplex (TDM) communication system for baseband analog signals is described. The constant amplitude pulse width modulation scheme utilizes small pulse width deviations for short‐haul opticalfiber applications. An enhanced signal‐to‐noise ratio (S / N) for low‐frequency information (< 1000 Hz) may be secured by detecting a high‐order Fourier signal component of the sampling frequency. © 1994 John Wiley & Sons, Inc.
Soliton formation in a nonlinear lossy lc ladder network with quadratic polynomial expression for the c‐v characteristic of the network capacitors
Authors: Ghafouri‐Shiraz H. , Shum P. 
Published: July 2007

AbstractWe propose a quadratic polynomial expression for the C‐V characteristic of the nonlinear capacitor of the LC ladder network and investigate the soliton propagation in such networks using a modified Korteweg‐de Vries (MKdV) equation. The MKdV equation has been solved by a novel technique which is based on the Fourier‐series analysis. Our theoretical results are in good agreement with experiment. © 1994 John Wiley & Sons, Inc.
Performance of an active antenna‐fed paraboloid reflector
Authors: Sancheti S. , Fusco V. F. 
Published: July 2007

AbstractThe performance of a paraboloid reflector with an active patch antenna feed has been analyzed. The effects of frequency pulling at the active antenna feed, induced by the parabolic reflector antenna, are measured and predicted. Measured far‐field pattern results for the combined reflector active antenna configuration are also presented. © 1994 John Wiley & Sons, Inc.
Ultrafast optoelectronic characterization of microwave semiconductor diodes
Authors: Adomavičius R. , Krotkus A. , Zakarevičius R. 
Published: July 2007

AbstractMicrowave semiconductor diodes are characterized on a picosecond time scale by means of an optoelectronic technique, in which the diode is biased with a variable‐duration high‐voltage pulse, while its output current is integrated with a box‐car integrator. Measured data on three different devices illustrate the technique. © 1994 John Wiley & Sons, Inc.
Resonant frequencies of an eccentric annular microstrip antenna
Authors: Kishk Ahmed A. , Zhang W. , Gordon R. K. 
Published: July 2007

AbstractThe resonant frequencies of an eccentric annular microstrip antenna are computed for different modes using the cavity model. The effect of the eccentricity on the resonant frequencies is investigated. The computed resonant frequencies are verified experimentally. The measured resonant frequencies are considered to be located at the minimum locations of the return loss. The magnetic field distribution is also computed and plotted for some patches. © 1994 John Wiley & Sons, Inc.
Computation of electromagnetic scattering by nonlinear bounded dielectric objects: A FDTD approach
Authors: Caorsi Salvatore , Massa Andrea , Pastorino Matteo 
Published: July 2007

AbstractA numerical approach to the computation of the field scattering by nonlinear bounded dielectric objects is proposed, which is based on the finite‐difference time‐domain method. A simple numerical scheme is developed to compute the field scattering by isotropic dielectrics whose permittivities exhibit a specific dependence on the electric field. A preliminary example concerning a Kerr‐like nonlinearity is discussed. © 1994 John Wiley & Sons, Inc.
A fast, accurate, and efficient method for pole extraction in microstrip problems
Authors: Ooi B. L. , Leong M. S. , Kooi P. S. 
Published: July 2007

AbstractIn this article, a fast and novel method is proposed to determine accurately and efficiently the singularity due to the surface wave as found in the electric field integral equation. The method involves a simple reorganization of the classical expressions for both the transverse electric (DTE) and the transverse magnetic surface wave modes (DTM) into some piecewise linear forms suitable for the Newton‐Raphson algorithm. Extensive numerical comparison is made with some of the classical methods used for pole extraction. The numerical results, as presented, confirm efficiency and fast quadratic convergence.
A new approximate formula for site shielding by a knife‐edge obstacle, based on measurements from 8 to 94 GHz
Authors: Vyncke Christian , Vorst André Vander 
Published: July 2007

AbstractThis article proposes a new approximate formula for determining the effectiveness of site shielding by a knife‐edge obstacle, by adding a correction term to the ITU‐R formula. The new formula is accurate to within 0.1 dB for diffraction angles less than 12° if the distance from obstacle to antenna is larger than 100 wavelengths, and to better than, respectively, 0.5 and 1 dB for diffraction angles less than 35° and 45°, as compared with, respectively, 3 and 5 dB obtained by the ITU‐R formula. It is based on UTD, after an experimental validation from 8 to 94 GHz. © 1995 John Wiley & Sons, Inc.
Fully monolithic image‐reject mixers for 38‐GHz wireless telecommunication links
Authors: Archer John W. , Mahon Simon J. , Sevimli Oya 
Published: July 2007

AbstractA prototype down‐converting mixer MMIC based on planar Schottky diodes and a production version based on HEMT diodes are reported. Measurements with a 1–2‐GHz i.f. indicate conversion losses of 8–11 and 10–14 dB, respectively, and image rejections > 20 dB. A HEMT‐based mixer‐amplifier MMIC with conversion gain of 3–8 dB and image rejection > 18 dB is also reported. Simulations agree well with these measurements. Image rejection is produced by an on‐chip i.f. coupler. This is the first report, to the authors' knowledge, of fully monolithic, image‐reject downconverters of this type. © 1995 John Wiley & Sons, Inc.
An improved analysis for optically preamplified pulse‐position modulation receivers in optical‐fiber systems
Authors: Cryan R. A. , Phillips A. J. , Senior J. M. 
Published: July 2007

AbstractUsing a recently developed moment‐generating function (MGF) we apply a Chernoff bound to the bit‐error probability of an optically preamplified pulse‐position modulation (PPM) receiver. Sensitivity results for PPM coding levels are presented for operation at the STM‐4 bit rate. It is shown that this receiver configuration can outperform an equivalent on‐off‐keyed nonreturn‐to‐zero (OOK NRZ) system by 7.1 dB. We further demonstrate the impressive potential of such an optically preamplified PPM receiver by giving results that improve on the fundamental sensitivity limit of an optically preamplified OOK NRZ receiver and approach the sensitivity of coherent detection. A Gaussian approximation is also developed and we compare it with results obtained from the Chernoff bound. © 1995 John Wiley & Sons, Inc.
Does impaired glucose metabolism cause polyneuropathy? Review of previous studies and design of a prospective controlled population‐based study
Authors: Dyck Peter J. , Dyck P. James B. , Klein Christopher J. , Weigand Stephen D. 
Published: July 2007

AbstractIn spite of extensive studies it is unclear whether impaired fasting glucose (IFG) or impaired glucose tolerance (IGT), i.e., impaired glucose metabolism (IGM), causes diabetic sensorimotor polyneuropathy (DSPN) or chronic idiopathic axonal polyneuropathy (CIAP); the results and conclusions vary considerably in different studies. Some studies suggest that IGM is a common and important cause of CIAP, whereas others do not. On reviewing these data, we judge that a considerable degree of this disparity may relate to differences in selection of patients, choice of controls, assessment of chronic glycemic exposure and of diabetic complications, and statistical power. Here we review previous studies, list the reasons that the issue needs further study, and outline a study now in progress to address the question more definitively. Muscle Nerve, 2007
Urological follow‐up of adult spina bifida patients
Authors: Ahmad Imran , Granitsiotis Paraskeve 
Published: July 2007

AbstractAimsThe vast majority of the current urological literature understandably has concentrated on the management of children with spina bifida, because in the past the majority did not survive into adulthood. With improvements in the understanding and multidisciplinary care of spina bifida patients it has become a disease of adults. Our aim was to evaluate the current literature to attempt to formulate evidence based guidelines for the management of this difficult group of patients.MethodsWe reviewed the literature on adult urological management of spina bifida, all relevant articles which concentrated on adults and long‐term management were studied in full.ResultsRenal function may begin/continue to deteriorate into adulthood, becoming the leading cause of adult death. This is thought to occur because of changes in the adult bladder, with increases in storage pressure. Medical and surgical management should aim to preserve renal function as well as the maintenance of continence in the face of the growing and changing urinary tract. Follow‐up should be regular and in the context of a specialist multidisciplinary clinic. Despite being unvalidated in the follow‐up of adult spina bifida patient's annual serum creatinine, ultrasound and urodynamics are currently the best tools available.ConclusionsThere is no reason why the majority of spina bifida sufferers cannot use their own kidneys for the rest of their lives. This however relies on urological treatment being instigated soon after birth and continuing into adulthood. Neurourol. Urodynam. 26:978–980, 2007. © 2007 Wiley‐Liss, Inc.
Gainsharing boosts quality and productivity at a Bfgoodrich plant
Authors: Masternak Robert L. 
Published: July 2007

AbstractThis case study of the implementation of a gainsharing plan at a California manufacturing operation shows the advantage of a nontraditional team‐based compensation system over a traditional individual‐based program. It also stresses the point that to be successful in improving quality and exceeding production goals, a gainsharing program must offer more than a new bonus schedule. It must also incorporate training, employee involvement, and clear communications and provide for an assessment process to modify the plan as necessary.
Oregon department of transportation steers improvement with performance measurement
Authors: Wipper Laura R. 
Published: July 2007

AbstractIn July 1989, a pilot project was developed to implement performance measurement at the Oregon Department of Transportation (ODOT). This program quantifies measures of efficiency and effectiveness for management teams and work teams, the department as a whole, and equates this data on a common scale. Rather than monitoring individual activities, the program focuses on results. Key factors in the accomplishment of results are tracked, and the outcomes are communicated on a regular basis. Efficiency measures gauge the cost and volume of production, while effectiveness measures track quality and customer satisfaction. This new focus has seen increasing success as the twenty‐seven ODOT Highway Division work crews participating in the pilot steadily improved productivity, culminating in savings of over $3.5 million. The success of the pilot has not only led to full implementation of the program at ODOT, but also caught the eye of Oregon's Department of Administrative Services, which mandated the program for all state agencies.
The critical role of auditing in continuous improvement
Authors: Dew John R. 
Published: July 2007

AbstractThere is a legitimate role for quality audits in today's workplace. The success of the audit depends on management's guidance of the audit, selection and training of auditors, and willingness to involve people in achieving the opportunities for improvement identified by the audit. To be effective, the audit process must be properly managed. A successful audit process is part of an overall plan for continuous improvement and can become a vehicle for recognizing excellence in an organization.
Project partnering in the construction industry: The wave of the future?
Authors: Larson Erik W. , Gray Clifford 
Published: July 2007

AbstractThe last two decades have seen a general decline in the vitality of the American construction industry, which has been plagued by declining profit margins, increases informal litigation, concerns over the quality of work, increases in administrative overhead, and an erosion of competitive advantage in the international marketplace. A response to these market pressures, project partnering recognizes that the traditional adversarial relationship between owner and contractor often degenerates into a loss‐lose relationship for everyone except the lawyers. Project partnering is directed at claims prevention and dispute avoidance rather than dispute resolution. This article describes the results of a survey designed to determine bow widespread the practice of project partnering is, and its prospects for the future.
When doing one better is not enough: The coming end of strategic incrementalism
Authors: Werther William B. 
Published: July 2007

AbstractThough incremental improvements are necessary for strategic survival, incremental ism is increasingly becoming an insufficient source of competitive advantage. Protected markets that are a necessary condition for the development of strategic advantage through incremental improvements in productivity, quality, time, or service will increasingly disappear. The remaining competitors, especially in mature industries, will encounter global competitors that already have in place successful incremental approaches. As this article explains, these approaches, while essential, will no longer be a source of competitive advantage. The ability to manage a wide variety of relationships, especially with those outside the organization, is likely to become a key, if not core, competency as firms move toward the next millennium.
A powerful new tool kit for the 21st century
Authors: Bhote Keki R. 
Published: July 2007

AbstractWhat is the real secret to long‐lasting quality improvement? Is there a single formula for success? In this article, the author argues that a comprehensive arsenal of mighty quality tools promising substantial payoffs In product and service enhancements are readily available to any organization‐that is, any organization that has the foresight and the discipline to employ them.
Guiding self‐directed teams to realize their potential
Authors: Buchen Irving H. 
Published: July 2007

AbstractAlthough they are well aware of the significant improvements that can be achieved through the work of self‐directed teams, organizations in both the public and private sectors often neglect the need to adequately prepare those teams for their tasks. In this article, the author details the best practices of team training to create a blueprint that organizations can readily follow for achieving greater productivity through teaming.
Focused performance measures drive important at Broan
Authors: Santowski Jerome G. , Podzunas Albert E. 
Published: July 2007

AbstractAfter revamping its business strategy to focus more strongly on satisfying customers—and investing heavily in cellular manufacturing and information technology—The Broan Group continued to encounter barriers to improving productivity. The opportunity for an improvement breakthrough occurred when the organization proved to employees that its traditional performance measurements were out of alignment with the company's new emphasis on improving customer satisfaction. As this article expains, by measuring the performance factors that mattered most to customers, Broan was able to improve productivity at a significantly faster rate than it had previously been able to achieve.
Work ethics
Authors: Roth William 
Published: July 2007

AbstractA majority of today's organization improvement efforts are not producing the desired results. The author believes the problem to be one of perspective. We have lost sight of the real purpose of “work.” The author traces the historical evolution of the concept of work. He shows how work's original purpose was to enhance individual and societal development. He shows how this purpose was gradually perverted as we have focused increasingly on generating only one key input to development: wealth. Finally, the author shows how the quality improvement movement could be the vehicle necessary to get back on the development track.