bluuebunny/crossref_metadata_2025_split huggingface dataset:
Left‐handed rectangular waveguide bandstop filters
Authors: Shelkovnikov Alexander , Budimir Djuradj 
Published: March 2006

AbstractA novel type of rectangular waveguide bandstop filter is presented. Incorporating a dielectric slab patterned with single split‐ring resonators (SRRs), the electromagnetic properties of the structures are modified to allow propagation of backward waves in the rectangular waveguide. Filters are created through integration of SRRs, wireline, and additional metal strips as a loading for the propagation media. Using the printed circuit board (PCB) technique, SRRs, wireline, and metal strips are etched on a dielectric substrate and the slab is then inserted in the central plane of the metallic waveguide. A three‐unit cell SRR‐loaded waveguide is investigated against a three‐unit cell LHM waveguide configuration. A three‐unit LHM rectangular waveguide bandstop filter is designed and analyzed in order to performance wide stopband performance. The simulated results are presented for a WG‐18 waveguide. LHM rectangular waveguide bandstop filters are compact, low cost, and suitable for mass production. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 846–848, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21494
Calculation of circular birefringence based on analysis of stokes curve curvature
Authors: Perlicki K. 
Published: March 2006

AbstractA novel method for circular‐birefringence calculation is proposed. The method is based on analysis of the curvature of a 3D curve (Stokes curve). The 3D curve segments are defined by a series of points that represent states of polarization. The obtained results indicate that the analysis of the curvature permits us to estimate the values of circular birefringence. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 854–856, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21497
Coaxial fed hexagonal dielectric resonator antenna for multifrequency operation
Authors: Hamsakutty V. , Praveen Kumar A. V. , Yohannan Jaimon , Bindu G. , Mathew K. T. 
Published: March 2006

AbstractHexagonal dielectric resonator antenna (HDRA) for multifrequency operation is proposed and investigated experimentally. The proposed antenna, excited by a single coaxial feed, resonates at four frequencies centered at 2.215, 2.784, 3.445, and 3.955 GHz with identical polarization. The return loss, VSWR, bandwidth, radiation patterns and half‐power beam width are measured and discussed. Multiple resonances with the same polarization and broad radiation patterns suggest the suitability of the antenna for multifrequency wireless applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 878–880, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21505
Extreme filtering applied to a microwave harmonic direction finding system
Authors: Zürcher J‐F. 
Published: March 2006

AbstractA new harmonic direction finding (HDF) system, presented in [1], consists of a 2.45‐GHz transmitter with a +30‐dBm output power, a receiver at 4.9 GHz with a sensitivity better than −120 dBm, and a specially developed dual‐frequency helical antenna [2]. Besides high‐performance electronics, this system requires filters with extreme characteristics in order to avoid interferences between transmitter and receiver and filter out the harmonics of the transmitter. In this paper, various filter types are considered, simulated, realized, and measured. Only two types are found to be adequate for the application: a compact high‐pass filter made of a dielectric waveguide, and a stopband filter. The measured characteristics surpass the required ones. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 880–883, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21506
A planar dual‐meander‐line antenna for multiband mobile handsets
Authors: Hsiao Hai‐Ming , Lu Jui‐Han 
Published: March 2006

AbstractA planar dual‐meander‐line antenna consisting of three branch strips for a low‐profile GSM/DCS/PCS/WLAN multiband mobile handset is proposed. The branch strips are designed to operate as quarter‐wavelength structures at 900 and 2000 MHz, respectively, and the obtained impedance bandwidths are 120 MHz (about 13.2%) and 924 MHz (about 44.4%) for covering the required bandwidths of the GSM (890–960 MHz) and DCS/PCS/UMTS/WLAN (1710–1880/1850–1990/1920–2170/2400–2484 MHz) bands. The proposed antenna can be mounted on top of a mobile phone with a low profile of 20 mm from ground plane. The measured antenna radiation patterns are approximately omnidirectional across the multiresonant bands. Peak antenna gains for operating frequencies across the GSM/DCS/PCS/UMTS/WLAN multiple bands are measured to be 1.8 and 2.9 dBi, respectively, with gain variations within 0.5 dBi. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 883–888, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21507
L‐band efficient and wavelength‐tunable Er3+/Yb3+ co‐doped cladding‐pumped fiber‐ring laser based on fiber‐loop mirror
Authors: Yu Fan , Fuyun Lu , Shumin Zhang , Shaojun Luo , Dai Wei , Xiaoyi Dong 
Published: March 2006

AbstractWe propose and demonstrate a novel, all‐fiber and wavelength tunable Er3+/Yb3+ co‐doped cladding‐pumped fiber‐ring laser, which utilized amplified spontaneous emission (ASE) as a secondary source so that it can operate in L‐band. The lasing threshold can be reduced to 30% by reflecting backward C‐band ASE into the same Er3+/Yb3+ co‐doped fiber (EYDF) using a fiber Bragg grating (FBG). By using a two‐section high‐birefringence fiber‐loop mirror (HiBi‐FLM) as the tunable wavelength filter, the tuning‐wavelength range can be up to 60 nm, from 1559.2 to 1619.4 nm, and the output power excursion of the laser at different wavelengths can be less than 0.2 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 892–895, 2006; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21509
Multimode‐fiber‐based edge filter for optical wavelength measurement application and its design
Authors: Wang Qian , Farrell Gerald 
Published: March 2006

AbstractA novel all‐fiber edge filter for optical wavelength measurement application is proposed. The filter sandwiches a multimode fiber (MMF) section with an optimally designed length between two single‐mode fibers and utilizes the multimode interference in the MMF section. A measurable wavelength range of more than 50 nm is obtained with a desired spectral location through optimally choosing the length of the MMF section. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 900–902, 2006; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21512
Arrayed waveguide grating multiplexer with boxlike spectral response
Authors: Ma Chun‐Sheng , Qin Zheng‐Kun , Zhang Hai‐Ming , Li Han , Zhang Da‐Ming , Liu Shi‐Yong 
Published: March 2006

AbstractAn efficient technique is proposed to flatten the spectral response of an arrayed waveguide grating (AWG) multiplexer. By subtracting an increment from the length difference of odd arrayed waveguides and by adding the same increment to that of even arrayed waveguides, a boxlike spectral response can be obtained. The simulated result for a 17 × 17 polymer AWG shows that the boxlike spectral response has a 3‐dB bandwidth of 0.49 nm, and the crosstalk is about or less than −28 dB for every output channel. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 916–919, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21518
Study of properties of highly birefringent microstructured optical fibers
Authors: He Lina , Zhang Yejin , Yang Sigang , Chen Xiangfei , Xie Shizhong 
Published: March 2006

AbstractA highly birefringent microstructured optical fiber (HB‐MOF) is investigated by using a UPML‐FDFD method. Based on the numerical results, the influence of the air‐hole size and pitch upon the mode birefringence, confinement loss, and single‐mode properties is analyzed. These properties and the influence among them are considered synthetically. Using the effective‐area method, the mode‐cutoff property of HB‐MOF is studied for the first time and the wavelength range for single‐mode operation can be obtained accurately. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 940–944, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21526
Miniature combined GSM‐GPS wire‐patch antenna
Authors: Zaid L. , Staraj R. 
Published: March 2006

AbstractThis paper describes a complete low‐cost radiating structure, combining a stacked wire‐patch GSM antenna, with an active GPS printed element located on the top of the GSM one. The GPS active amplifier and filter are located under the ground plane of GSM antenna and receive the DC bias voltage through the GPS coaxial probe feed. GSM antenna is a low‐profile, large‐bandwidth antenna with a dipolar radiation pattern. This structure, totally protected by a low‐cost dielectric radome, is very suitable for automobile applications needing a very small ground plane. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 970–972, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21536.
Thermally expanded core fiber with high numerical aperture for laser‐diode coupling
Authors: Lin Yu‐Cheng , Lin San‐Chien 
Published: March 2006

AbstractA thermally expanded core fiber with high numerical aperture (HNA‐TEC) is demonstrated here to relax the tolerance of laser diode (LD) to fiber alignment. We experimentally clarify the dependence of mode field radius (MFR) on heating time for HNA‐TEC fiber. The MFR was expanded at the increasing rate of 0.067 μm/minute on the condition of 1100°C heat treatment. For a HNA‐TEC fiber with MFR 4.56 μm, the transverse and axial coupling tolerances were enlarged effectively by about 81% and 50%, respectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 979–981, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21539.
A single feed shorted patch antenna with low cross‐polarized fields
Authors: Kan H. K. , Waterhouse R. B. , Lee A. Y. J. , Pavlickovski D. 
Published: March 2006

AbstractIn this paper, we present a single‐feed shorted patch antenna with low cross‐polarized radiated fields. The printed antenna uses two shorted parasitic elements symmetrically located around the driven shorted patch. These elements electromagnetically balance the radiator. We have experimentally verified the new antenna and have found its cross‐polarized radiation patterns to be significantly lower than a conventional shorted patch by an order of more than 10 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 984–986, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21541
Influence of post‐treatment conditions on photoreactive effect of Zn:Fe:LiNbO3 crystals
Authors: Fang Shuang‐Quan , Ma De‐cai , Wang Biao , Ling Fu‐Ri , Wang G. 
Published: March 2006

AbstractThree kinds of different Zn:Fe:LiNbO3 wafers are prepared by proper reduction or oxidation post‐treatment processes. The optical‐damage‐resistance abilities and photorefractive properties are studied using the optical compensator technique and two‐wave coupling measurement, respectively. The holographic storage properties, that is, diffraction efficiency, writing time, erasure time, photorefractive sensitivity, and dynamic range, are also measured or calculated. The analyses indicate that the sample disposed by reduction is the most proper media for holographic storage application. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 986–988, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21542
Clinical electrophysiological characterization of the acquired neuromyotonia phenotype of autoimmune peripheral nerve hyperexcitability
Authors: Maddison Paul , Mills Kerry R. , Newsom‐Davis John 
Published: March 2006

AbstractAcquired autoimmune neuromyotonia is regarded as part of the spectrum of peripheral nerve hyperexcitability disorders. We aimed to use clinical neurophysiological measurements to study the extent, distribution, and characteristics of spontaneous motor unit potentials in 11 patients with acquired neuromyotonia. Investigations revealed that most spontaneous discharges recorded were motor unit, or partial motor unit potentials of normal size. Bursts of motor unit potentials arose more commonly from distal portions of the peripheral nerve and had abnormal absolute and relative refractory periods. Spontaneous discharges in some patients occurred in semirhythmic bursts in certain muscles. No patient had neurophysiological abnormalities detectable in first‐order neurons of the central nervous system when using transcranial magnetic stimulation to estimate the threshold for corticomotor excitation and determine central motor conduction time. Only patients with coexistent myasthenia gravis had neurophysiologically detectable defects in neuromuscular transmission. The pathogenic region of abnormality in peripheral nerve hyperexcitability disorders therefore seems to lie within the terminal branches of peripheral motor nerves. Muscle Nerve, 2006
A misclassification cost‐minimizing evolutionary–neural classification approach
Authors: Pendharkar Parag , Nanda Sudhir 
Published: March 2006

AbstractMachine learning algorithms that incorporate misclassification costs have recently received considerable attention. In this paper, we use the principles of evolution to develop and test an evolutionary/genetic algorithm (GA)‐based neural approach that incorporates asymmetric Type I and Type II error costs. Using simulated, real‐world medical and financial data sets, we compare the results of the proposed approach with other statistical, mathematical, and machine learning approaches, which include statistical linear discriminant analysis, back‐propagation artificial neural network, integrated cost preference‐based linear mathematical programming‐based minimize squared deviations, linear integrated cost preference‐based GA, decision trees (C 5.0, and CART), and inexpensive classification with expensive tests algorithm. Our results indicate that the proposed approach incorporating asymmetric error costs results in equal or lower holdout sample misclassification cost when compared with the other statistical, mathematical, and machine learning misclassification cost‐minimizing approaches. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006.
A case of short‐root anomaly in a female from medieval Istria
Authors: Šikanjić P. Rajić , Meštrović S. 
Published: March 2006

AbstractDental examination of a young female skeleton from medieval Istria revealed very short‐roots of both maxillary central incisors. This developmental pathological condition is known in the literature as short‐root anomaly, occurring mostly in maxillary incisors. In affected teeth, the crown:root ratio is 1:1.6. Although the prevalence of this condition has been reported in modern populations, this appears to be the first documented case of the anomaly from the medieval period. Unfortunately, fragmentary preservation of the skeletal material prevents us from making a full diagnosis of possible aetiology. Copyright © 2006 John Wiley & Sons, Ltd.
Insights into the processes behind the contamination of degraded human teeth and bone samples with exogenous sources of DNA
Authors: Gilbert M. T. P. , Hansen A. J. , Willerslev E. , Turner‐Walker G. , Collins M. 
Published: March 2006

AbstractA principal problem facing human DNA studies that use old and degraded remains is contamination from other sources of human DNA. In this study we have attempted to contaminate deliberately bones and teeth sampled from a medieval collection excavated in Trondheim, Norway, in order to investigate this poorly understood phenomenon. Five pairs of teeth and bone samples were bathed in water containing various concentrations (from 10−9 and 10−21 g/l) of purified ΦX174 DNA. Subsequently the samples were subjected to a routine decontamination protocol involving a bleach bath followed by exposure to λ=254 nm ultraviolet light, prior to DNA extraction and analysis for evidence of the persistence of the contaminant. The results support previous speculation that bone is more susceptible to water‐borne sources of contaminant DNA, although both bone and teeth are readily contaminated and are difficult to decontaminate using the tested protocol. We believe that this is largely due to the porous nature of bone and teeth facilitating the deep penetration of the contaminant DNA. To simulate a more realistic handling situation, 27 further teeth were directly handled and washed, then decontaminated, prior to assaying for the residual presence of the handler's DNA. Surprisingly, although our results suggest that a large proportion of the teeth were contaminated with multiple sources of human DNA prior to our investigation, we were unable to contaminate the samples with further human DNA. One potential explanation may be the deposition of sediment or other structural changes that occur within the samples as they desiccate post‐excavation, which may protect samples from subsequent contamination, but also prevent the efficacy of bleach baths in decontaminating specimens. Copyright © 2006 John Wiley & Sons, Ltd.
Perceptions of fieldwork education in Malta: challenges and opportunities
Authors: Bonello Marjorie 
Published: March 2006

AbstractAcademic upgrading of the occupational therapy programme in Malta has necessitated exploration of current fieldwork practices through a qualitative study. Data were collected through one‐to‐one interviews with 18 recently qualified occupational therapists. The findings showed the multi‐faceted and complex nature of the fieldwork process, confirming the strong influence and relationships between the fieldwork context, the fieldwork supervisor and the different values and attitudes each learner brings to the fieldwork situation. The various practices as voiced by the participants affected the quality of their fieldwork experiences in different ways. Awareness of these key influences will pave the way forward for fieldwork education planners to provide meaningful experiences. Copyright © 2001 Whurr Publishers Ltd.
Multicontextual occupational therapy intervention: a case study of traumatic brain injury
Authors: Landa‐Gonzalez Belkis 
Published: March 2006

AbstractCognitive deficits after a traumatic brain injury can result in significant functional limitations in all areas of daily living. An individual's ability to generalize learning may be limited, thus making it harder to live independently in the community. Assessing a client's metacognitive skills and awareness level may help to establish a baseline understanding about the supervision required and the most suitable living arrangements. This study describes a multicontextual, community re‐entry occupational therapy programme directed at awareness training and compensation for cognitive problems in a 34‐year‐old man with traumatic brain injury. Intervention consisted of metacognitive training, exploration and use of effective processing strategies, task gradations and practice of functional activities in multiple environmental contexts. Strategies such as self‐prediction, self‐monitoring, role reversal and the use of checklists were used. Results after six months of intervention show improvements in the client's awareness level, enhancement of his occupational function, increased satisfaction with performance and a decrease in the level of attendant care. Additional studies are recommended to validate the findings. Copyright © 2001 Whurr Publishers Ltd.
Going the distance: developing shared web‐based learning programmes
Authors: Stanton Sue 
Published: March 2006

AbstractDespite a high demand for continuing professional education, it is becoming more challenging to provide education in a resource‐limited environment that meets the varied needs of learners. The advent of user‐friendly, interactive communication technology led the University of British Columbia in Canada to explore the feasibility of developing a web‐based distance learning programme shared by undergraduate and practising therapists to address this problem. Potential benefits and challenges of distance learning, undergraduate web‐learning, pilot‐test results and an assessment of therapists' interests and needs are profiled. Copyright © 2001 Whurr Publishers Ltd.
European Network of Occupational Therapy in Higher Education: a five‐year review
Authors: Bruggen Hanneke Van 
Published: March 2006

AbstractIn 1995 occupational therapy programmes in Europe founded a network in Aalborg, Denmark, with the aim of advancing the education of occupational therapists and the body of knowledge of the discipline. The European Network of Occupational Therapy in Higher Education (ENOTHE) is one of 43 other academic networks supported by the European Commission. The achievements, impact and obstacles in the work of ENOTHE will be discussed. Copyright © 2001 Whurr Publishers Ltd.
Australian occupational therapy practice in acute care settings
Authors: Griffin Susan D. , McConnell David 
Published: March 2006

AbstractA national sample of occupational therapists was surveyed to explore the nature of Australian occupational therapy practice in acute care settings. Self‐care was the major client need that therapists reported they addressed, with an initial interview being the most common assessment procedure. Client education was the most frequently used intervention. The most important skills therapists reported for effective practice in acute care were time management, quick clinical reasoning and lateral thinking. Important workplace characteristics included a cooperative health‐care team and early referral. Therapists reported that their most important resources were supportive senior therapists and a well‐resourced equipment pool. Three attitudinal factors emerged. Therapists in interdisciplinary teams and those with more experience had more positive attitudes. Younger therapists experienced more concern about not being able to do more for their patients. Results suggest a need for graduates to be better prepared in some skill areas and to have more realistic expectations of practice in this area. Department managers need to ensure younger therapists receive adequate support from senior therapists. Further research is needed to determine how best to provide this support and to further examine the influence of the education experience on practice expectations. Copyright © 2001 Whurr Publishers Ltd.