bluuebunny/crossref_metadata_2025_split huggingface dataset:
Deflektometrie zur Qualitätsprüfung spiegelnd reflektierender Oberflächen (Deflectometry for Quality Control of Specular Surfaces)
Authors: Kammel Sören 
Published: December 2003

Abstract
Defekte auf glänzend lackierten Oberflächen wie z.B. Karosserieteilensind für den menschlichen Betrachter leichter wahrzunehmen — und damit störender — als auf diffus reflektierenden Oberflächen. Aus diesem Grund werden für Werkstücke, deren visuelle Erscheinung relevant für ihre Verwendung ist, besonders empfindliche Messverfahren benötigt. Deflektometrische Messverfahren ahmen die menschliche Wahrnehmung nach, indem sie das zu vermessende Objekt als Spiegel einsetzen, dessen Abbildungseigenschaften die Bestimmung der gewünschten Oberflächenfunktion erlauben. Sie erreichen eine wesentlich höhere Empfindlichkeit als Triangulationsverfahren.
Schnell-Heizapparatur für die strahlenchemische Modifizierung von Polymerfolien im Schmelzezustand (A High Speed Heater for a Radiation-induced Chemical Modification of Melted Polymer Foils)
Authors: Jenschke Wolfgang , Dorschner Helmut , Arnold Dietrich , Stephan Michael , Brünig Harald 
Published: December 2003

Abstract
In der vorliegenden Arbeit wird eine Heizapparatur vorgestellt, mit der dünne Polymerfolien in sehr kurzer Zeit aufgeschmolzen und während einer anschließenden Elektronenbestrahlung auf vorbestimmter Temperatur gehalten werden können. Hierzu wird die Konstruktion der Apparatur sowie die zugehörige Gerätetechnik vorgestellt, das Regelverhalten diskutiert und einige Testergebnisse von Aufschmelzvorgängen gezeigt. Ein weiterer Schwerpunkt sind Untersuchungen zum Einfluss der Bestrahlungsparameter auf das Regelverhalten der Apparatur während der Elektronenbestrahlung.
Resonance characteristics of whispering gallery modes in parallel‐plates‐type cylindrical dielectric resonators
Authors: Akay M. Fatih , Prokopenko Yuriy , Kharkovsky Sergey 
Published: December 2003

AbstractIn this paper, the results of analytical and numerical investigation of whispering gallery modes (WGMs) in parallel‐plates‐type cylindrical anisotropic and isotropic dielectric resonators are presented. The dependence of the WGMs' resonant frequency, Q‐factor, and energy‐filling factor upon resonator parameters for the wide range of the azimuthal index has been studied numerically. The optimization of resonator parameters for sensing applications is discussed. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 96–101, 2004; Published online in Wiley Interscience (www.interscience.wiley.com). DOI 10.1002/mop.11296
A 2‐pole CPW resonator BPF with attenuation poles using point‐coupled λ/4 resonators
Authors: Wada Kouji , Tatsumi Makoto , Kamiyama Tomohide , Hashimoto Osamu , Harada Hiroshi 
Published: December 2003

AbstractThe aim of this study is to examine a coplanar bandpass filter (BPF) with attenuation poles using point‐coupled λ/4 resonators. The first part of this paper describes the resonance characteristics of the λ/4 resonators with chosen excitation methods. Secondly, the design of the BPF with attenuation poles using the λ/4 resonators is carried out based on general filter theory with narrowband approximation. A comparison between theory and experiment is also performed. It is confirmed that the method presented is useful for improving the BPF's skirt characteristics using λ/4 resonators. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 101–107, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11297
Efficient and low‐noise gain‐flattened double‐pass L‐band erbium‐doped fiber amplifier
Authors: Harun S. W. , Ahmad H. 
Published: December 2003

AbstractA new double‐pass long‐wavelength‐band erbium‐doped fiber amplifier with enhanced noise figure characteristics is demonstrated by adding a short length of forward pumped erbium‐doped fiber (EDF) in front of the double‐pass amplifier. By adding 7 m of EDF, the amplifier achieves a flat‐gain output at about 34.2 dB with a gain variation of less than 1.3 dB at the wavelength region 1568–1598 nm. The corresponding noise figures vary from 5.0 to 5.7 dB, which is improved by 1.7 to 7.5 dB over the flat‐gain region, as compared to that of the conventional double‐pass amplifier. This new amplifier with high gain and low noise figure can be useful as an inline amplifier in a wavelength division multiplexing transmission system. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 112–114, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11300
Low‐frequency fast inhomogeneous plane‐wave algorithm (LF‐FIPWA)
Authors: Jiang L.J. , Chew W.C. 
Published: December 2003

AbstractA new method, the low‐frequency fast inhomogeneous plane‐wave algorithm (LF‐FIPWA) is presented to extend the traditional multilevel fast multipole algorithm (MLFMA) and fast inhomogeneous plane‐wave algorithm (FIPWA) seamlessly into the low‐frequency range. It uses evanescent‐wave extrapolation and translation techniques to overcome the low‐frequency breakdown problem. The accuracy can be well controlled over a broad frequency range. Numerical examples show the effectiveness of this new algorithm. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 117–122, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11302
Modeling of optical link for OCDMA‐based cascaded optical networks
Authors: Reddy Y. Bhanuprakash , Alphones Arokiaswami 
Published: December 2003

AbstractIn cascaded optical networks, the BER performance of optical CDMA (OCDMA) signals has been evaluated. In order to simulate the optical link, the optical source, receiver, and fiber channel are modeled as lowpass filters by using Butterworth/Chebyshev approximations. Bipolar codes are used for spreading, and at the chip rate of 8 Gc/s, multi‐user interference (MUI) and distortion introduced by the optical link are found to be insignificant. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 122–124, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11303
A novel method to optimize optical‐fiber Raman amplifiers using equally spaced low‐power laser diode pumps
Authors: Zhou Junhe , Chen Jianping , Li Xinwan 
Published: December 2003

AbstractThis paper proposes a novel, less expensive optical‐fiber Raman amplifier, which employs equally spaced low‐power laser diodes as pumps. The genetic algorithm (GA) is modified to optimize the configuration of the pumps. Simulation results show that, for operation in the bandwidth from 1530 to 1610 nm, the amplifier provides a gain profile of small in‐band ripple and sharp out‐of‐band roll off. About 20% of pump power can be saved. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 124–127, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11304
Design and experimental results of bilateral interdigital coplanar delay line for MMICs
Authors: Yoon Hargsoon , Abraham Jose K. , Varadan Vijay K. 
Published: December 2003

AbstractThe design and development of a bilateral interdigital coplanar waveguide (Bi‐CPW) delay line that can be used as a passive device in MMICs is presented in this paper. This Bi‐CPW design is analyzed using the conformal mapping method and realized via an RF‐CMOS‐compatible fabrication process using high‐k dielectric thin film. The Bi‐CPW design shows 180° phase delay at 10 GHz for a 2.8‐mm transmission line. It is shown that a conventional coupler can be implemented in a few mm2 area without any lumped element. The measured results show the potential for monolithic integration of conventional couplers using Bi‐CPW phase delay line. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 127–130, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11305
Patch‐antenna efficiency based on Wheeler cap and measured Q factor
Authors: García‐García Quiterio 
Published: December 2003

AbstractA new method to determine antenna efficiency, based on the Wheeler cap technique, is presented. It uses the ratio between measured Q factors of the shielded and free‐space antenna impedances as a measure of radiation efficiency. The measured reflection coefficient of the antenna is fitted to an analytical function from which the unloaded Q can be determined. The method is particularized to microstrip patch antennas and is illustrated with simulated and measured results. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 132–142, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11307
Compact spurious free CPW bandpass filters based on electromagnetic bandgap structures
Authors: Martin F. , Bonache J. , Gil I. , Falcone F. , Lopetegi T. , Laso M. A. G. , Sorolla M. 
Published: December 2003

AbstractIn this paper, coplanar waveguide (CPW) bandpass filters based on capacitively coupled resonators and periodic perturbation in slot width are proposed. Due to periodicity, the structure behaves as a reflector in a certain frequency band and harmonic suppression is achieved. Slot‐width modulation has been implemented through the approximation of the ground planes to the conductor strip at periodic locations. The equivalent capacitance of the line is thus enhanced, with the result of a significant slow‐wave effect. In comparison to a conventional design, the fabricated prototype is 1.4 times smaller and exhibits significant rejection of frequency parasitics. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 146–148, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11309
An asymmetrical feed arrangement for improved impedance bandwidth of planar monopole antennas
Authors: Ammann M. J. , Chen Zhi Ning 
Published: December 2003

AbstractThe use of an asymmetrical feed probe is shown to significantly increase the impedance bandwidth of a square planar monopole antenna. The feed probe is offset from the center of the planar element. The optimum location of the feed probe is shown to increase the impedance bandwidth by a factor of 3.4. The effect of the asymmetry on radiation patterns is also shown. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 156–158, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11313
Characteristics of a compact microstrip antenna
Authors: Gupta Vibha R. , Gupta Nisha 
Published: December 2003

AbstractThe characteristics of a bow‐shaped microstrip patch antenna are analyzed and compared with a conventional rectangular microstrip antenna. The various parameters such as return loss, gain, and VSWR are determined and compared. It is found that the center frequency of the bow‐shaped antenna is lower by about 12.82% than that of the conventional rectangular microstrip antenna. This implies that the size of the patch needs to be reduced in order to maintain the same resonant frequency. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 158–160, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11314
Conjugation symmetry in linear electromagnetism in extension of materials with negative real permittivity and permeability scalars
Authors: Lakhtakia Akhlesh 
Published: December 2003

AbstractIf all space is occupied by a linear bianisotropic material—whether homogeneous or not—then the concurrent replacements of the permittivity and the impermeability tensors by the negatives of their respective complex conjugates and of the magneto‐electric tensors by their respective complex conjugates (in the Boys–Post representation) imply the conjugation of both E and H, in the absence of externally impressed sources. This conjugation symmetry in linear electromagnetism has observable consequences when the linear bianisotropic material occupies a bounded region. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 160–161, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11315
Six‐port reflectometer based on four 0°/180° microstrip ring couplers
Authors: Mohra Ashraf S. 
Published: December 2003

AbstractA six‐port reflectometer constructed from a 0°/180° microstrip‐ring coupler is presented. Three different constructions are given with their optimum positions of the q‐point. One of these constructions is realized on an RT/Duroid 5880 at 3 GHz. Good agreement with the measurements obtained using a vector network analyzer is found. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 167–170, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11318
A compact integrated band‐pass filter on a low‐dielectric constant polyimide dry film
Authors: Lim Ohk‐Kun , Lee Joon‐Ik , Kim Yong‐Jun , Park Jae‐Yeong 
Published: December 2003

AbstractA new compact integrated tapped‐line combline filter, with metal‐insulator‐metal (MIM)‐type capacitive loads, is designed and fabricated using newly proposed micromachining techniques that employ a polyimide dry film as a dielectric layer. For increased uniformity of thickness, a dry‐film fabrication process is developed. The presented filter is realized with a relatively small size, 3.68 by 4.53 mm, on a polyimide dry film and shows up to 50% size reduction as compared with a general quarter‐wavelength filter. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 177–179, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11321
Chorioangioma and its severe infantile sequelae: case report
Authors: Maymon Ron , Hermann Gratiana , Reish Orit , Herman Arie , Strauss Simon , Sherman Dan , Heyman Eli 
Published: December 2003

AbstractObjectiveThis case report describes a rare clinical presentation of chorioangioma diagnosed prenatally because of raised‐maternal serum (MS) alpha‐fetoprotein.MethodsA thirty‐year‐old woman gravida 2, para 1 was referred to the ultrasound unit at 18 weeks of gestation because of abnormal MS triple‐test results. This included AFP level of 14.9 MoM; hCG of 3.42 MoM and uE3 of 1.01 MoM. A detailed anomaly scan revealed a singleton fetus with no sonographically detectable malformations and normal amniotic fluid.The placenta was posterior. A well‐circumscribed, rounded, predominantly hypoechoic lesion near the chorionic surface measuring 5 × 5 cm and protruding into the amniotic cavity was detected. Color Doppler sonogram showed no blood flow within the mass, but clear fetal waveforms in its periphery were demonstrated, and the diagnosis of chorioangioma was made. The pregnancy was followed uneventfully until 35 weeks of gestation when polyhydramnios and severe fetal cardiomegaly developed. Labor was therefore induced.ResultsA euploid female, who had multiple diffuse cutaneous and liver angiomatosis was born. She died at the age of one month because of cardiac failure and infection.ConclusionsThe present case alerts to the interrelationship between placental and fetal angiomas. This may lead to severe infantile sequelae because of similar lesions. Copyright © 2003 John Wiley & Sons, Ltd.
Congenital cystic adenomatoid malformation: accuracy of prenatal diagnosis, prevalence and outcome in a general population
Authors: Gornall A. S. , Budd J. L. S. , Draper E. S. , Konje J. C. , Kurinczuk J. J. 
Published: December 2003

AbstractObjectivesMost available data regarding accuracy of prenatal diagnosis, prevalence and outcome of congenital cystic adenomatoid malformation (CCAM) are derived largely from tertiary referral centres and may not reflect general population rates. We aimed to describe the accuracy of prenatal diagnosis, ascertain the population prevalence and post‐natal outcome for cases of suspected CCAM.MethodsRetrospective collection of prenatal and paediatric data for cases of suspected CCAM notified to the Trent Congenital Anomalies Register 1997 to 2001.ResultsThirty‐seven cases of CCAM were suspected prenatally. Twenty‐one cases were confirmed post‐natally as having a CCAM (positive predictive value 57%). Eighteen of the 21 cases were delivered at term as live births, 15 of which have undergone successful surgery to date. Thirteen of the 37 cases had apparently resolved by delivery. Three further cases were subsequently found to be cases of lung sequestration or lobar emphysema. Five cases of CCAM were detected after delivery (sensitivity of prenatal detection 81%). The population prevalence at delivery was 9.0 per 1 00 000 total births. Five confirmed cases of CCAM developed hydrops, three required in utero intervention and delivered as live births at term, one was terminated and one died in utero. The overall mortality in the confirmed cases of CCAM was 23% of which the majority were terminations of pregnancy.ConclusionsProblems of diagnostic accuracy and apparent resolution of CCAM render counselling difficult, although our data suggest that the prognosis is better than others have reported. Confirmation of the diagnosis in the neonatal period is vital in order to obtain the true population prevalence figures and to interpret outcome data. Copyright © 2003 John Wiley & Sons, Ltd.
Living with achondroplasia: attitudes toward population screening and correlation with quality of life
Authors: Gollust Sarah E. , Thompson Richard E. , Gooding Holly C. , Biesecker Barbara B. 
Published: December 2003

AbstractObjectivesSince the discovery of the gene that causes achondroplasia, population‐wide prenatal screening for this condition has become a possibility. This study sought to assess attitudes toward screening for achondroplasia and correlation with quality of life in a population of individuals affected with achondroplasia and first‐degree relatives.MethodsSurveys were collected from 189 individuals affected with achondroplasia and 136 average‐statured first‐degree relatives.ResultsWhile 87% of all respondents would support the use of prenatal screening by affected parents at risk of having a fetus with the homozygous, lethal form of achondroplasia, 29% would support general population prenatal screening for achondroplasia. Attitudes supporting general population screening were more likely to be held by those people with less education, who were affected with achondroplasia, who supported abortion, and who believed that achondroplasia is a serious condition without any accompanying advantages (p < 0.01). Those respondents who felt positively toward offering the prenatal test for individuals at risk for homozygous achondroplasia were more likely to have lower mean quality of life scores and to support abortion in general (p < 0.05).ConclusionThese data suggest that opinions about prenatal screening are heterogeneous within this study population and are related to individuals' experiences and perceptions of the condition. Future research is needed to assess attitudes toward population screening and quality of life in communities of individuals affected with genetic conditions, both to support policy decisions and to inform the education and counseling provided in the prenatal setting. Copyright © 2003 John Wiley & Sons, Ltd.
Psychotropic drugs and fatal pulmonary embolism
Authors: Parkin Lianne , Skegg David C. G. , Herbison G. Peter , Paul Charlotte 
Published: December 2003

AbstractPurposeTo examine the association between the use of psychotropic drugs and fatal pulmonary embolism.MethodsWe conducted a national case‐control study of fatal pulmonary embolism. Cases were 75 New Zealand men and women aged 15–59 years who died between 1 January 1990 and 31 December 1998, where the underlying cause of death was certified as codes 415.1, 451 or 453 of the International Classification of Diseases (9th Revision). Four controls, matched for sex and age, were selected from the general practice to which each case had belonged. Information was abstracted from the records of general practitioners, family planning clinics and psychiatric services. Odds ratios and 95% confidence intervals (95% CI) were estimated using conditional logistic regression. The key analyses were restricted to cases (n = 62) and controls (n = 243) without major risk factors for venous thromboembolism.ResultsCompared to non‐use, the adjusted odds ratio for current use of antipsychotic drugs was 13.3 (95% CI: 2.3–76.3). Low potency antipsychotics appeared to carry the highest risk (odds ratio: 20.8 [95% CI: 1.7–259.0]). The main drug involved was thioridazine. The odds ratio for current use of antidepressants was also increased, at 4.9 (95% CI: 1.1–22.5).ConclusionsOur results for conventional antipsychotics are consistent with previous studies of non‐fatal venous thromboembolism. The finding for antidepressants needs to be replicated in other studies. Copyright © 2003 John Wiley & Sons, Ltd.
Risk assessment of drugs, biologics and therapeutic devices: present and future issues
Authors: Strom B. L. 
Published: December 2003

AbstractPurposeThe current US system for detecting adverse effects of therapeutics (drugs, devices and biological products) is suboptimal. This report presents the results of an expert workshop on assessing therapeutic risks. This is the second of five workshops coordinated by the Centers for Education and Research on Therapeutics (CERTs) to address the management of therapeutic risks relative to potential benefits.MethodsThe workshop included academic, industry, government and constituency‐based leaders. The focus was on the postapproval phase and procedures in the US, but relevant international issues and attendees were included.ResultsSubstantial deficiencies in the current US system for risk assessment were delineated. Improving the system will involve research into methods to improve risk assessment, enhancement and consolidation of data‐handling systems, education of healthcare workers, allocation of financial resources and building of constituencies.ConclusionsWe need leadership on multiple levels for global coordination of risk assessment. We can then begin to fill gaps and produce benefits for industry, health authorities, government agencies, healthcare providers, and most important, the public. Copyright © 2003 John Wiley & Sons, Ltd.
A population‐based study of drug use in the very old living in a rural district of Sweden, with focus on cardiovascular drug consumption: comparison with an urban cohort
Authors: Klarin Inga , Fastbom Johan , Wimo Anders 
Published: December 2003

AbstractPurposeTo describe drug use among the elderly, with focus on cardiovascular drugs and regional differences.MethodsCross‐sectional data from a Swedish population‐based study on ageing and dementia were used. In rural Nordanstig, drug‐use data for 918 participants, 75 years and older (N1), were collected during the period 1995–1998. The data for 335 participants, 84 years and older (N84+), were compared with 418 subjects of the same age group in urban Kungsholmen (K5), data collected 1997–1998.ResultsOver 90% of the participants were using drugs regularly or ‘as needed’. The most common were cardiovascular drugs, nervous system drugs and drugs for the alimentary tract and metabolism. Polypharmacy (five drugs or more) was common, especially among the oldest, 46% (N84+) and 50% (K5). ACE‐inhibitors were used by only 24% of the N1 participants with heart failure. Significantly fewer of cognitively impaired participants were treated with ACE‐inhibitors (OR: 0.44) and beta‐blockers (OR: 0.50). Significant regional differences among the oldest old were found, with more cardiovascular (OR: 2.72) and less antithrombotic drugs (OR: 0.43) in the rural 84+ group.ConclusionsThe extensive drug consumption, high prevalence of polypharmacy and regional differences stress the need for rigorous monitoring of drug use in the elderly. The data also indicate undertreatment of some cardiovascular diseases in the elderly with cognitive impairment. Copyright © 2003 John Wiley & Sons, Ltd.