bluuebunny/crossref_metadata_2025_split huggingface dataset:
Radiation characteristics of a corrugated horn antenna
Authors: Afsar Mohammed N. , Wang Yong 
Published: October 2002

AbstractA corrugated horn antenna is modeled using the three‐dimensional FDTD method. The computed E‐plane radiation pattern shows a good agreement with those measured and calculated using the MoM published in the literature. The H‐plane radiation pattern and the cross‐polarization patterns for both E‐ and H‐plane are also obtained since the corrugated horn is calculated by a three dimensional model. The radiation characteristics for various frequencies have also been analyzed. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 83–84, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10379
Presentation of the spectral electric and magnetic field integral equations used in G2DMULT for analyzing cylindrical structures of multimaterial regions
Authors: Yang Jian , Kildal Per‐Simon 
Published: October 2002

AbstractWhen dealing with electromagnetic problems of three‐dimensional (3D) elements, such as dipoles, microstrip patches, and slots, in the vicinity of two‐dimensional (2D) structures, it is very efficient to find the radiation characteristics of the 3D elements and the mutual couplings between them by using a spectrum of 2D solutions (S2DS). G2DMULT is a general algorithm that applies the S2DS technique to calculate the spectral Green's functions of 2D multiregion structures by using the method of moments (MoM). When these spectral Green's functions are used, the spectral electric and magnetic field integral equations (EFIE and MFIE) are needed to solve the 2D problems in the spectral domain. This Letter presents the spectral electric and magnetic field integral equations (EFIE and MFIE), their moment‐method solution formulations, and the special expressions needed to handle the discontinuity of some field components at the material boundaries. Several numerical examples show that G2DMULT with these spectral EFIEs and MFIEs can provide accurate results compared with measurements. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 88–93, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10382
Microstrip/thick‐slot/microstrip transitions in millimeter waves
Authors: Lafond O. , Himdi M. , Daniel J.P. , Haese–Rolland N. 
Published: October 2002

AbstractThis Letter deals with millimeter microstrip/thick‐slot/microstrip transitions. This kind of transition permits multilayer microstrip antenna arrays to feed. The objectives were to develop and to optimize this transition at 60 GHz, with the use of a low‐loss, low‐cost substrate. A thick ground plane with a slot is introduced between the two substrate layers to rigidify the final structure. Then several transitions were realized and measured in the 60‐GHz band to validate the calculation. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 100–103, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10385
An impedance boundary condition for the efficient matched termination of waveguides in FDTD simulations
Authors: Pereda José A. , Vegas Ángel , Prieto Andrés , Caño Oscar 
Published: October 2002

AbstractThis Letter introduces a novel impedance boundary condition (IBC) for the matched termination of waveguide ports in finite‐difference–time‐domain (FDTD) simulators. It is based on approximating the wave impedance by a rational function over the frequency band of interest. To show the validity of the proposed IBC, the reflection coefficient of a wideband matched 90° H‐plane corner in rectangular waveguide is computed. The results obtained, which are less than −45 dB over the whole waveguide band, are in good agreement with those obtained by a commercial finite‐element simulator. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 151–155, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10400
Superposition of the output pulses under synchronous discharge in a multiple‐electrode‐pair laser
Authors: Ye Lihua , Sha Tao , Li Xiangyin , He Anzhi , Cui Yiping 
Published: October 2002

AbstractIf the pressure, voltage, and other discharge parameters of a multiple‐electrode‐pair laser are held constant, there is a nonlinear pulse energy enhancement effect when several sets of electrode pairs are triggered synchronously. The mechanism of the effect is analyzed and a reasonable theoretical model, which is in agreement with the experimental results, is built. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 207–211, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10418
A new class of miniature quadrature couplers for MIC and MMIC applications
Authors: Sheta Abdel Fattah , Mohra Ashraf , Mahmoud Samir F. 
Published: October 2002

AbstractA new class of miniature quadrature couplers suitable for microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs) are presented. The proposed couplers have some advantages compared to conventional types, such as smaller size, no harmonic response, and wide stop‐band characteristics. Two 3‐dB quadrature couplers at two different frequencies, 0.9 and 10 GHz have been designed and simulated. The coupler designed at 900 MHz has been fabricated on Duroid substrate with microstrip technology. Compared to the standard quadrature coupler more than 65% area savings, has been achieved, and the first higher‐order response appears at 5.8 GHz. The measured results show good agreement with theoretical prediction. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 215–219, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10421
Parametric study and synthesis of 60‐GHz Fabry–Perot resonators
Authors: Sauleau R. , Le Ray G. , Coquet Ph. 
Published: October 2002

AbstractThe analysis and the synthesis of plane‐parallel Fabry–Perot (FP) resonators, illuminated by a normally incident plane wave, are investigated theoretically and experimentally in the 60‐GHz band. The reflecting mirrors are inductive metal meshes with square apertures. The frequency response of symmetrical and asymmetric FP cavities is studied (a) approximately with the transmission‐line theory (TL), and (b) and rigorously with the Finite‐difference–time‐domain (FDTD) technique combined with periodic boundary conditions. Then, the inverse problem is solved with the use of an iterative procedure based on the FDTD method. In particular, it is shown theoretically and checked experimentally that the thickness of the cavity is the most critical parameter in the design, although the grid dimensions enable a precise adjustment of the module and of the phase of the internal reflection coefficients. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 247–252, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10429
Wide‐band, low‐profile millimeter‐wave antenna array
Authors: Navarro Julio 
Published: October 2002

AbstractA low‐profile 60‐GHz antenna array has been designed, built, and tested. The design uses a circular waveguide radiator for bandwidth, a stripline distribution network for minimum thickness and flexibility, and a waveguide input for interfacing to other components. Boresight gain variations of less than ±1.5 dB were demonstrated for several units over 57–63 GHz. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 253–255, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10430
Comparison of surface electric field and impedance matrix elements of layered media between electric field spatial Green's function and mixed potential
Authors: Huang Chung‐Chi , Tsang Leung , Miller Dennis , Tripathi Alok 
Published: October 2002

AbstractRecently an approach based on half‐space extraction technique was used to efficiently evaluate the electric field spatial Green's function on a surface. This Letter compares the results of this method with the mixed‐potential formulation in spatial domain. Both surface electric fields and impedance matrix elements for layered media are compared for source and observation‐point distances ranging from 0.1 free‐space wavelengths to 10 free‐space wavelengths. The results show two orders of magnitude improvement on the speed of convergence for Sommerfeld integration domain and better numerical stability. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 307–313, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10445
Comments on “de‐embedding PCB fixtures for package characterization”
Authors: Silvonen Kimmo 
Published: October 2002

Abstract© 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 322, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10681
Time‐domain integral‐equation based analysis of scattering from conducting surfaces including the singular edge behavior
Authors: Yu Yongxue , Weile Daniel S. , Lu Mingyu , Michielssen Eric 
Published: October 2002

AbstractA method for modeling singular electric currents near conducting edges within marching‐on‐in‐time (MOT) simulators is presented. The use of singular basis functions in MOT simulators presents unique challenges not encountered in frequency‐domain implementations. Numerical results demonstrate that the proposed expansion results in accelerated convergence for scatterers with sharp features. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 327–332, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10452
Angular dependent characteristics of a 1.3‐μm GaInNAs/GaAs quantum‐well resonant cavity enhanced photodetect
Authors: Ruikang Zhang , Yuan Zhong , Wei Zhang , Yingqiang Xu , Yun Du , Yongqing Huang , Xiaomin Ren , Zhichuan Niu , Ronghan Wu 
Published: October 2002

AbstractCharacteristics of a 1.3‐μm GaInNAs RCE PD with respect to the incident light angle were analyzed both in theoretical simulation and experiments. The results show the influence can be neglected when the light incidence angle is less than 3°. This is a requirement for the PD to be applied in WDM networks. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 333–336, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10454
An accurate and stable implicit solution for transient scattering and radiation from wire structures
Authors: Jung Baek Ho , Sarkar Tapan Kumar , Chung Young‐Seek , Ji Zhong 
Published: October 2002

AbstractThis Letter presents an accurate and stable method for the solution of transient electromagnetic response from conducting wire structures with the use of the time‐domain electric‐field integral equation (TD‐EFIE). By using an implicit scheme with the central finite difference for the TD‐EFIE, the transient responses from a wire scatterer illuminated by a plane wave and a wire antenna with an impressed voltage source are obtained. Also, a wire above a conducting plate is considered. Numerical results that show the validity of the presented methodology are presented. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 354–359, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10461
Dependence of ridge position on the cutoff wavelength of the dominant mode in single ridge waveguides
Authors: Lu Mai , Leonard Paul J. 
Published: October 2002

AbstractThe influence of the ridge position on the cutoff wavelength of the dominant mode in a single‐ridge waveguide is analyzed by the finite‐element method. The cutoff wavelength can be adjusted by changing the ridge dimensions as well as by adjusting its position. More design data are presented. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 374–377, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10466
Total assignment of 1H and 13C NMR spectra of three triterpene saponins from roots of Silene vulgaris (Moench) Garcke
Authors: Bouguet‐Bonnet Sabine , Rochd Mohamed , Mutzenhardt Pierre , Henry Max 
Published: October 2002

AbstractThe assignments of 1H and 13C NMR spectra for three new triterpene saponins from Silene vulgaris (gypsogenin 3‐O‐glucuronide, quillaic acid 3‐O‐glucuronide, and gypsogenin 3‐O‐glycoside) are reported. In addition to 1D NMR methods, 2D NMR techniques (COSY, HSQC, HMBC, and HSQC‐TOCSY) were used for the assignments. Copyright © 2002 John Wiley & Sons, Ltd.
EST analysis of gene expression in testis of the ascidian Ciona intestinalis
Authors: Inaba Kazuo , Padma Potturi , Satouh Yuhkoh , Shin‐i Tadasu , Kohara Yuji , Satoh Nori , Satou Yutaka 
Published: October 2002

AbstractTo explore the gene expression underlying spermatogenesis, a large‐scale analysis has been done on the cDNAs from testis of the ascidian, Ciona intestinalis. A set of 5,461 expressed sequence tags was analyzed and grouped into 2,806 independent clusters. Approximately 30% of the clusters showed significant sequence matches to the proteins reported in DDBJ/GenBank/EMBL database including a set of proteins closely related to the gene regulation during spermatogenesis, functional and morphological changes of spermatogenic cells during spermiogenesis, and physiological functions of sperm, as well as those with housekeeping functions commonly expressed in other cells. Some clones show similarities to the proteins present in vertebrate lymphocytes, suggesting a primitive immune system in ascidians. We have also found some genes that are known to participate in hormonal regulation of spermatogenesis in vertebrates. The large majority of the genes expressed in Ciona testis show no significant matches to known proteins and the further analysis of these genes may shed new light on the molecular mechanism of spermatogenesis and sperm functions. Mol. Reprod. Dev. 62:431–445, 2002. © 2002 Wiley‐Liss, Inc.
Clinical trials and treatment prospects
Authors: Percy Alan K. 
Published: October 2002

AbstractProspects for definitive therapeutic intervention for Rett syndrome (RS) have been elevated by the discovery of mutations in the methyl‐CpG‐binding protein 2 gene (MECP2) in more than 80% of females meeting clinical criteria for this disorder. As such, a review of previous clinical trials, descriptions of the status of clinical management for the prominent medical problems of RS, and a preview of an ongoing clinical trial conducted jointly at the Baylor College of Medicine and the University of Alabama at Birmingham are presented. The conduct of controlled clinical trials requires adherence to diagnostic criteria for RS; stratification by age, stage, and presence of MECP2 mutations; and use of clearly defined outcome measures. Previous clinical trials in RS have been conducted with L‐carnitine, the ketogenic diet, and the opiate antagonist, naltrexone. The L‐carnitine and naltrexone trials were double blind, placebo‐controlled and us ed the motor behavioral analysis described in this review. All failed to provide evidence of dramatic improvements in the clinical features of RS. Specific recommendations are presented for clinical management of growth failure, breathing irregularities, seizures, ambulation, scoliosis, gastrointestinal function, self abuse, and habilitation/education although systematic evaluations of each in the context of RS have not been conducted. The only ongoing trial involves dietary supplementation with folate and betaine and is based on the finding that gene expression of some alleles of the agouti gene could be altered by dietary methyl supplementation. The availability of animal models expressing mutations in MECP2 should enhance the evaluation of innovative therapies for RS. MRDD Research Reviews 2002;8:106–111. © 2002 Wiley‐Liss, Inc.
Recovery from distal ulnar motor conduction block injury: Serial EMG studies
Authors: Montoya Liliana , Felice Kevin J. 
Published: October 2002

AbstractAcute conduction block injuries often result from nerve compression or trauma. The temporal pattern of clinical, electrophysiologic, and histopathologic changes following these injuries has been extensively studied in experimental animal models but not in humans. Our recent evaluation of a young man with an injury to the deep motor branch of the ulnar nerve following nerve compression from weightlifting exercises provided the opportunity to follow the course and recovery of a severe conduction block injury with sequential nerve conduction studies. The conduction block slowly and completely resolved, as did the clinical deficit, over a 14‐week period. The reduction in conduction block occurred at a linear rate of −6.1% per week. © 2002 Wiley Periodicals, Inc. Muscle Nerve 26: 145–149, 2002
Optimal outbound dispatch policies: Modeling inventory and cargo capacity
Authors: Çetinkaya Sıla , Lee Chung‐Yee 
Published: October 2002

AbstractIn this paper, we present an optimization model for coordinating inventory and transportation decisions at an outbound distribution warehouse that serves a group of customers located in a given market area. For the practical problems which motivated this paper, the warehouse is operated by a third party logistics provider. However, the models developed here may be applicable in a more general context where outbound distribution is managed by another supply chain member, e.g., a manufacturer. We consider the case where the aggregate demand of the market area is constant and known per period (e.g., per day). Under an immediate delivery policy, an outbound shipment is released each time a demand is realized (e.g., on a daily basis). On the other hand, if these shipments are consolidated over time, then larger (hence more economical) outbound freight quantities can be dispatched. In this case, the physical inventory requirements at the third party warehouse (TPW) are determined by the consolidated freight quantities. Thus, stock replenishment and outbound shipment release policies should be coordinated. By optimizing inventory and freight consolidation decisions simultaneously, we compute the parameters of an integrated inventory/outbound transportation policy. These parameters determine: (i) how often to dispatch a truck so that transportation scale economies are realized and timely delivery requirements are met, and (ii) how often, and in what quantities, the stock should be replenished at the TPW. We prove that the optimal shipment release timing policy is nonstationary, and we present algorithms for computing the policy parameters for both the uncapacitated and finite cargo capacity problems. The model presented in this study is considerably different from the existing inventory/transportation models in the literature. The classical inventory literature assumes that demands should be satisfied as they arrive so that outbound shipment costs are sunk costs, or else these costs are covered by the customer. Hence, the classical literature does not model outbound transportation costs. However, if a freight consolidation policy is in place then the outbound transportation costs can no longer be ignored in optimization. Relying on this observation, this paper models outbound transportation costs, freight consolidation decisions, and cargo capacity constraints explicitly. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 531–556, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10030
Forbidden subpaths for Steiner minimum networks in uniform orientation metrics
Authors: Brazil M. , Thomas D. A. , Weng J. F. 
Published: October 2002

AbstractThe Steiner problem in the λ‐plane is the problem of constructing a minimum network connecting a given set of nodes (called terminals), with the constraint that all line segments have slopes chosen from the λ uniform orientation angles ω, 2ω, … , λω, where ω = π/λ. This problem appears to be substantially harder than either the Euclidean or rectilinear Steiner problem, as there can be many different λ‐networks that have the same topology and terminal set, but are locally minimal with respect to the perturbation of single Steiner points. In this paper, we show that there are large classes of such networks that cannot be minimum because they necessarily contain subpaths that can be perturbed to shorten the length of the network. These classes are defined in terms only of the angles between edges in the paths and not edge lengths. Using largely geometric methods, we give a complete classification of these “forbidden paths.” This classification will be a crucial element in devising a pruning process for future efficient exact algorithms for solving the Steiner problem in the λ‐plane. © 2002 Wiley Periodicals, Inc.
Dimensioning multicast‐enabled communications networks
Authors: Prytz Mikael , Forsgren Anders 
Published: October 2002

AbstractThis paper concerns the network design problem of dimensioning capacity, available in discrete, nonuniform levels, for multicast traffic in a backbone communications network. An integer programming model, which includes embedded models for the Steiner tree problem in graphs, is proposed. A Lagrangian decomposition scheme based on variable splitting is suggested for computing lower bounds on the optimal objective function value. This decomposition gives a set of Steiner tree subproblems, which are solved using a branch‐and‐cut algorithm, and a set of capacity‐level subproblems, which are solved as sequences of 0–1 knapsack problems. A method for finding good primal feasible solutions while solving the relaxed problem is suggested, and an overall branch‐and‐bound strategy on the variable split constraints is also proposed and implemented. Computational results are reported for two sets of test problems that have been generated from real problems. One set has real, nonuniform cost and capacities, while the other set has uniform costs and capacities. The results suggest that the main difficulty in the problem is the discrete, nonuniform capacity‐level selection. The variable split relaxation lower bound is consistently superior to the bounds obtained from LP relaxation and a straight‐forward Lagrangian relaxation for the test problems with a nonuniform cost and capacity structure. © 2002 Wiley Periodicals, Inc.