bluuebunny/crossref_metadata_2025_split huggingface dataset:
Negative‐ and positive‐phase‐velocity propagation in an isotropic chiral medium moving at constant velocity
Authors: Mackay Tom G. , Lakhtakia Akhlesh 
Published: August 2007

AbstractAnalysis of electromagnetic planewave propagation in a medium which is a spatiotemporally homogeneous, temporally nonlocal, isotropic, chiral medium in a comoving frame of reference shows that the medium is both spatially and temporally nonlocal with respect to all non‐co‐moving inertial frames of reference. Using the Lorentz transformations of electric and magnetic fields, we show that plane waves which have positive phase velocity in the comoving frame of reference can have negative phase velocity in certain non‐co‐moving frames of reference. Similarly, plane waves which have negative phase velocity in the comoving frame can have positive phase velocity in certain non‐co‐moving frames. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2640–2643, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22810
A high‐performance miniaturized 3 15.5‐GHZ 13‐DB CMOS distributed amplifier
Authors: Chang Jin‐Fa , Lin Yo‐Sheng , Chen Chi‐Chen 
Published: August 2007

AbstractIn this article, we demonstrate a high‐performance 3–15.5‐GHz distributed amplifier (DA) for ultra‐wideband (UWB) system applications implemented with a standard 0.18‐μm CMOS technology. To achieve high gain, wide bandwidth, and small chip‐area at the same time, miniaturized inductors with high quality‐factor and small parasitic capacitance were adopted, the bias of the field‐effect transistors (FETs) was optimized, and cascode FETs were used to replace the traditional common‐source FETs. In addition, to improve the stability of the DA, a damping resistor RGwas added to the gate of the common‐gate FETs. Over the 3–15.5‐GHz frequency band, this LNA achieved good forward gain (S21) of 10–13 dB, input return loss (S11) of −11.5 to −31.4 dB, reverse isolation (S12) of −21.6 to −37.1 dB, and noise figure (NF) of 5 to 7.2 dB. Moreover, the DA exhibited good input 1‐dB compression point (P1dB) of −1.5 dBm and input third‐order inter‐modulation point (IIP3) of 12.5 dBm at 6 GHz. The chip area was only 1050.9 μm × 539.8 μm (i.e. 0.567 mm2) excluding the test pads. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2742–2747, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22820
Double‐printed circular disc antenna having a frequency band notch function
Authors: Jie Sheng , Yang Xue‐Xia , Sun Jiang‐Tao , Lu Yi‐Min 
Published: August 2007

AbstractIn this paper, a novel UWB (ultra‐wide bandwidth) antenna having a frequency band notch is presented. The ring‐slot is used to change the current distribution and realize the frequency notch function. The measured return loss less than −10.0 dB is from 3.1 to 5.0 GHz and from 6.0 to 10.6 GHz, and the frequency notch band is from 5.15 to 5.825 GHz. The simulated gain changes between 2.0 and 6.5 dB within the pass band and varies between −1.5 and 1.0 dB within the band‐notched part. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2675–2677, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22824
Compact sharp cutoff wide stopband microstrip low‐pass filter using complementary split ring resonator
Authors: Dwari Santanu , Sanyal Subrata 
Published: August 2007

AbstractA novel compact microstrip low‐pass filter (LPF) is proposed using open circuit stubs and square patches alongwith complementary split ring resonator (CSRR). It exhibits wide stopband and sharp rejection. A demonstration LPF, having 3‐dB cutoff frequency of 1.45 GHz, was fabricated and measured. Measured passband to stopband attenuation slope is more than 355 dB/GHz. Measured rejection greater than 20 dB extends over more than 13.75 times of the 3‐dB cutoff frequency. Electrical length of the filter is less than 12% of the guided wavelength at 3‐dB cutoff frequency. Experimental and simulated results agree well. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2865–2867, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22825
Realization of complete polarization conversion using periodic structure composed of left‐handed materials
Authors: Fang Weihai , Xu Shanjia 
Published: August 2007

AbstractThe polarization conversion characteristics of dielectric periodic structure composed of left‐handed materials for the case of plane wave oblique incidence are carefully investigated by a method which combines the multimode network theory with the rigorous mode matching method. It is indicated that complete polarization conversion between TE and TM modes can be realized using left‐handed gratings. This can hardly achieve in the conventional right‐handed gratings. This unique merit of left‐handed periodic structure is an important significance for accurate design of new millimeter wave polarization converters. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2862–2864, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22826
Stacked dual layer complementing Sierpinski gasket planar antenna
Authors: Ghatak Rowdra , Mishra Rabindra K. , Poddar Dipak R. 
Published: August 2007

AbstractA stacked configuration of Sierpinski microstrip antenna, with the patches on each layer complementing each other, shows prominent reflection coefficient (Γ) in lower and upper frequency bands; and better performance with respect to impedance bandwidth and gain. This article reports and compares the simulation and experiment results to validate the above claims. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2831–2833, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22827
A novel method to determine general Chebyshev filters transmission zeroes
Authors: Chu Qing‐Xin , Tu Zhi‐Hong 
Published: August 2007

AbstractDetermination of cross‐coupled filters order and transmission zeroes is the foundation of advanced filters designs. This article presents a novel and effective method to determine them in terms of general Chebyshev filters extreme characteristics and given specifications. All of combinations of them can be obtained and positions of transmission zeroes can be optional. It makes up the casualness of selecting them and is more convenient for practical filters designs. Three application examples illustrate the procedure and the validity of this method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2849–2853, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22832
A stable solution of time domain electric field integral equation using weighted Laguerre polynomials
Authors: Chung Young‐Seek , Lee Yoonju , So Joonho , Kim Joonyeon , Cheon Chang‐Yul , Lee Byungje , Sarkar Tapan K. 
Published: August 2007

AbstractIn this article, we propose a new stable solution for the time domain electric field integral equation (TD‐EFIE) for arbitrarily shaped conducting structures, which utilizes weighted Laguerre polynomials as temporal basis functions, which means that the unknown surface currents are expanded by these basis functions. The proposed algorithm is based on the Galerkin's scheme that involves separate spatial and temporal testing procedures. By introducing the temporal testing procedure, the conventional marching‐on in time procedure can be replaced by a recursive relation between the different orders of the weighted Laguerre polynomials. In this article, by deriving the integral formulation using the weighted Laguerre polynomials, we solve for the surface current density as the unknown directly. To verify the accuracy of the proposed method, we have compared the results with the inverse discrete Fourier transform of the frequency domain solutions for the electric field integral equation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2789–2793, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22835
Determination of resonance frequency of hexagonal and half hexagonal microstrip antennas
Authors: Ray K. P. , Pandey M. D. , Krishnan S. 
Published: August 2007

AbstractFormulations to determine the resonance frequencies of hexagonal and half hexagonal microstrip antennas have been proposed based on their equivalence with circular and semicircular microstrip antennas, respectively. The new configuration of half hexagonal patch formed by bisecting the full hexagon along its resonant length, has the same resonance frequency as that of the full hexagonal patch, with half the size. Simulations and experiments have been performed to validate the proposed method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2876–2879, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22843
High isolation 2.4/2.6 GHz dual‐band full‐duplex patch antenna transceiver for WLAN
Authors: Kaya Adnan 
Published: August 2007

AbstractThis paper presents results for a novel active transmit‐receive antenna and designing a high port isolation dual frequency orthogonally polarized inset rectangular patch antenna. Measurements show an improvement of 20 dB in port isolation relative to the conventional antenna, operating at 2.4 and 2.6 GHz. An inset microstrip patch antenna operating at 10.5 GHz having 12.22% bandwidth has been used as a reference antenna. It is also shown that the return loss level of the antenna has been enhanced by using active matching with RC mutator networks from −10.62 dB to −14.76 dB respectively. In addition, this paper presents the design of an integrated 2.4/2.6 GHz full duplex dual‐band antenna transceiver for WLAN 802.11 a/b/g applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2843–2848, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22845
Circularly polarized microstrip antenna with harmonics suppression
Authors: Sun Jiangtao , Yang Xuexia , Sheng Jie 
Published: August 2007

AbstractThe design of circularly polarized (CP) microstrip antenna with harmonics suppression is first proposed. The tapered defected ground structure (TDGS) has been utilized to obtain bandstop characteristics. The measured return losses at the second and third harmonic frequencies are −1.2 and −2.7 dB, respectively. The measured CP axial ratio is 0.8 in the broadside direction at 5.53 GHz. The details of the simulated and experimental results for the proposed design are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2841–2843, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22846
Coupled‐mode theory for spun four‐lobe stress region fibers
Authors: Qian Jingren , Wang Xuxu 
Published: August 2007

AbstractBased on coupled‐mode theory for LP modes, spun four‐lobe stress region fibers are theoretically analyzed. It is indicated for the first time that there are not any birefringence in spun four‐lobe stress region fibers if four lobes are symmetrically placed around the fiber axis. The same result is valid for spun fibers with eight‐lobe and 16‐lobe stress region, both having zero birefringence. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2814–2817, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22847
Design of multilayered dual‐band bandpass filter using cross‐coupled stepped impedance resonators
Authors: Weng Min‐Hang , Chang Yu‐Chi , Wu Hung‐Wei , Huang Chun‐Yueh 
Published: August 2007

AbstractIn this letter, a multilayered dual‐band bandpass filter (BPF) using cross‐coupled stepped impedance resonators (SIRs) is designed and implemented. By determining the impedance ratio (K) and physical length (α) of the SIRs, the dual‐band response at 2.4/5.2 GHz can be achieved. Cross‐coupling effect between two layers is introduced to generate the transmission zeros and improve the passband selectivity of the filter. In addition, the filter size is greatly reduced because of the use of multilayered folded SIRs. The measured results are in good agreement with the full‐wave simulation results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2713–2717, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22853
Transverse transmission line method to analyze stop‐band microwave filters
Authors: Campos A. L. P. S. 
Published: August 2007

AbstractIn this article, we consider the analysis of stop‐band microwave filters using periodic structures on isotropic substrates with dielectric losses. Frequency selective surfaces composed by an array of rectangular conducting patch elements are considered to compose the stop‐band filters. This analysis uses the method of moments in combination with the transverse transmission line method, in the Fourier domain, to determine the scattering characteristics of the considered structures. A good agreement with the results presented by the other authors is observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2678–2681, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22856
Medizinische Chemie der 5‐HT3‐Rezeptor‐Antagonisten. Vom Cocain zu innovativen Antiemetika
Authors: Zettl Heiko , Schubert‐Zsilavecz Manfred , Siebert Carsten D. 
Published: August 2007

AbstractDie Einführung der 5‐HT3‐Rezeptor‐Antagonisten (Setrone), beginnend mit Ondansetron in den späten 1980er Jahren, hat die bis dahin unbefriedigende Therapie der CINV (chemotherapy‐induced nausea and vomiting; Chemotherapie‐induzierte Übelkeit und Erbrechen) revolutioniert und den Weg für die ambulante Onkologie gebahnt.
Aprepitant, der erste therapeutisch wirksame NK1‐Rezeptor‐Antagonist. Prävention von Übelkeit und Erbrechen
Authors: Nieber Karen , Schoppmeyer Konrad 
Published: August 2007

AbstractDie meisten konventionellen Zytostatika wirken mehr oder weniger stark emetogen. Ohne wirksame Prävention leiden daher viele Patienten infolge der Chemotherapie unter Übelkeit und Erbrechen. Die Einführung der 5‐HT3‐Rezeptor‐Antagonisten und deren Kombination mit Dexamethason führte zu einer erheblichen Verbesserung der antiemetischen Prophylaxe. Dennoch können nicht alle Patienten zufriedenstellend behandelt werden. Aprepitant (Emend®) ist ein Antiemetikum mit neuem Wirkmechanismus. Es hemmt als Neurokinin‐1‐Rezeptor‐Antagonist die durch den Neurotransmitter Substanz P hervorgerufene Emesis, vor allem in der verzögerten Phase bei hoch emetogener Cisplatin‐basierender Chemotherapie. Aprepitant in der Dosierung von 125/80/80 mg an drei aufeinander folgenden Tagen ist gegenwärtig zugelassen zur Prävention akuter und verzögerter Übelkeit und Erbrechen bei hoch emetogener auf Cisplatin‐basierender und moderat emetogener Chemotherapie als Teil einer Kombinationstherapie. Aprepitant in einer Dosierung von 40 mg ist zusätzlich zugelassen zur Prävention von Übelkeit und Erbrechen nach Operationen.
Pflanzliche Antiemetika. Inhaltsstoffe, Molekulare Wirkmechanismen und Klinische Evidenz
Authors: Crockett Sara L. , Schühly Wolfgang , Bauer Rudolf 
Published: August 2007

AbstractIn Mitteleuropa werden viele Medizinalpflanzen gegen Übelkeit und Erbrechen verwendet. Pflanzenextrakte mit reinen oder aromatischen Bitterstoffen, ätherischem Öl oder anderen speziellen Wirkstoffen können Verdauungsstörungen verringern, Magen‐ und Darmkrämpfe lindern und/oder gegen spezifische Gehirn‐ oder Magenrezeptoren wirken, die Erbrechen auslösen. Die Wirkungen von Cannabis sativa und Zingiber officinale, die in der traditionellen Medizin Anwendung bei Erbrechen finden, sind durch klinische Studien abgesichert. Jedoch sind über die Wirkung und den Wirkungsmechanismus von Pflanzenextrakten und deren Inhaltsstoffen gegenüber Rezeptoren, die im Geschehen von Übelkeit und Erbrechen eine Rolle spielen, wie z.B. die 5‐HT3‐, 5‐HT4, M3‐ oder H3‐Rezeptoren, noch wenig gesicherte Erkenntnisse vorhanden. Diese Tatsache weist auf die Bedeutung weiterführender Forschung auf diesem Gebiet hin.
Gentherapie bei Niemann‐Pick
Authors: Bause Alexandra , Neumann Silke , Worlicek Johannes , Dingermann Theo , Zündorf Ilse 
Published: August 2007

AbstractLysosomale Speicherkrankheiten werden durch den Mangel oder Defekt jeweils eines einzigen Enzyms verursacht – eigentlich ideale Voraussetzungen für eine Gentherapie. Entsprechende Untersuchungen wurden kürzlich von Wissenschaftlern der Genzyme Corporation und der Mount Sinai School of Medicine im renommierten Journal PNAS vorgestellt.
Powder Flow: The 4M Business and Systems Approach
Authors: Verwijs Marco 
Published: August 2007

AbstractProfessor Brian Scarlett initiated and promoted the 4M business for particle technology for many years. The four M's consist of making, measuring, modeling, and manipulating. Measuring and modeling are tools to design and control products and processes, which one wants to make and manipulate. In order to properly utilize the 4M business, a systems approach needs to be used in which every system has its own time and length scale. In this paper, the 4M business and systems approach as taught by Professor Scarlett are explained and their applicability to powder flow is discussed. It is shown that the four M's are largely interconnected and are more useful when used in conjunction with one another.
Characterisation of Flowability of Loosely Compacted Cohesive Powders by Indentation
Authors: Hassanpour Ali , Ghadiri Mojtaba 
Published: August 2007

AbstractIn this paper we report on our investigations of the flowability of bulk powders using indentation and unconfined direct compression testing on a small assembly of powders compacted at low pressure levels. Samples of α‐lactose, magnesium carbonate and glass beads (made cohesive by silanization) have been consolidated to different pressure levels (ranging from 3 to 20 kPa) and the indentation hardness and unconfined yield stress of the compacts were then characterised. The latter was obtained by unconfined direct compression. The experimental results show that there is a linear relationship between the yield stress and consolidation pressure for the cases of α‐lactose and magnesium carbonate, from which it is possible to deduce the powder flow behaviour. The results of yield stress obtained from indentation and unconfined compression measurements are similar for the cases of α‐lactose and magnesium carbonate, whilst the results are different for the case of cohesive glass beads. Furthermore simulations were carried out using the Distinct Element Method to predict the bulk behaviour of the cohesive powders based on single particle mechanical properties. The simulation results qualitatively agree with the experiment, i.e. there is a linear relationship between the unconfined yield stress and the consolidation pressure, from which the role of inter‐particle adhesion on the flow behaviour may be deduced.
Clinical significance of the presence of amniotic fluid ‘sludge’ in asymptomatic patients at high risk for spontaneous preterm delivery
Authors: Kusanovic J. P. , Espinoza J. , Romero R. , Gonçalves L. F. , Nien J. K. , Soto E. , Khalek N. , Camacho N. , Hendler I. , Mittal P. , Friel L. A. , Gotsch F. , Erez O. , Than N. G. , Mazaki‐Tovi S. , Schoen M. L. , Hassan S. S. 
Published: August 2007

AbstractObjectivesTo determine the clinical significance of the presence of amniotic fluid (AF) ‘sludge’ among asymptomatic patients at high risk for spontaneous preterm delivery.MethodsThis retrospective case–control study included 281 patients with (n = 66) or without (n = 215) AF ‘sludge’, who underwent transvaginal ultrasound examination between 13 and 29 completed weeks of gestation. Patients with threatened preterm labor, multiple gestation, fetal anomalies, placenta previa or uterine contractions were excluded.ResultsThe prevalence of AF ‘sludge’ in the study population was 23.5% (66/281). The rates of spontaneous preterm delivery at < 28 weeks, < 32 weeks, < 35 weeks and < 37 weeks of gestation were 14.7% (29/197), 21.3% (46/216), 28.7% (62/216) and 42.1% (91/216), respectively. Patients with ‘sludge’ had: (1) a higher rate of spontaneous preterm delivery at < 28 weeks (46.5% (20/43) vs. 5.8% (9/154); P < 0.001), < 32 weeks (55.6% (25/45) vs. 12.3% (21/171); P < 0.001) and < 35 weeks (62.2% (28/45) vs. 19.9% (34/171); P < 0.001); (2) a higher frequency of clinical chorioamnionitis (15.2% (10/66) vs. 5.1% (11/215); P = 0.007), histologic chorioamnionitis (61.5% (40/65) vs. 28% (54/193); P < 0.001) and funisitis (32.3% (21/65) vs. 19.2% (37/193); P = 0.03); (3) a higher frequency of preterm prelabor rupture of membranes (PROM) (39.4% (26/66) vs. 13.5% (29/215); P < 0.001), lower gestational age at preterm PROM (median 24.7 (interquartile range (IQR), 22.3–28.1) weeks vs. 32.3 (IQR, 27.7–34.8) weeks; P < 0.001); and (4) shorter median ultrasound‐to‐delivery interval (‘sludge’ positive 127 days (95% CI, 120–134 days) vs. ‘sludge’ negative 161 days (95% CI, 153–169 days); P < 0.001) and ultrasound‐to‐preterm PROM interval (‘sludge’ positive 23 days (95% CI, 7–39 days) vs. ‘sludge’ negative 57 days (95% CI, 38–77 days); P = 0.003) than those without ‘sludge’. AF ‘sludge’ was an independent explanatory variable for the occurrence of spontaneous preterm delivery at < 28 weeks, < 32 weeks and < 35 weeks, preterm PROM, microbial invasion of the amniotic cavity (MIAC) and histologic chorioamnionitis. Moreover, the combination of a cervical length < 25 mm and ‘sludge’ conferred an odds ratio of 14.8 and 9.9 for spontaneous preterm delivery at < 28 weeks and < 32 weeks, respectively.ConclusionsAF ‘sludge’ is an independent risk factor for spontaneous preterm delivery, preterm PROM, MIAC and histologic chorioamnionitis in asymptomatic patients at high risk for spontaneous preterm delivery. Furthermore, the combination of ‘sludge’ and a short cervix confers a higher risk for spontaneous preterm delivery at < 28 weeks and < 32 weeks than a short cervix alone. Copyright © 2007 ISUOG. Published by John Wiley & Sons, Ltd.
The analysis of 1,2‐epoxyalkanes by gas liquid chromatography
Authors: Glowacki C. R. , Menardi P. J. , Link W. E. 
Published: August 2007

AbstractTerminal epoxides react quantitatively with methanol in the presence of boron trifluoride to give both primary and secondary hydroxy methyl ethers. These derivatives are useful in the analysis of terminal epoxide mixtures by gas liquid chromatography. This procedure is compared with the conventional method and with a procedure in which the 1,2‐epoxyalkanes are reduced to the corresponding secondary alcohols with LiAlH4. A statistical analysis of experimental data obtained from known mixtures of long chain epoxides is described. Results of this analysis demonstrate the improved accuracy and precision of the method as compared to the other methods investigated. LiAlH4 reduction is the preferred method of analysis for the more reactive epoxides as well as for the cyclic epoxides. This procedure is particularly useful in the analysis of epoxides containing a tertiary carbon atom. The application of this technique to other epoxides is expected to improve their analysis, but further work is necessary.
Residual lipids of hexane‐extracted repaseed meal
Authors: Mckillican M. E. , Larose J. A. G. 
Published: August 2007

AbstractThe residual lipids of rapeseed meals produced by pilot‐scale and commercial solvent‐extraction processes were extracted with hexane (free lipids), then extracted with chloroform‐methanol (bound lipids). Thin layer chromatography showed that the free lipids were similar to those previously reported for intact mature seed. The amount of residual free lipid varied with the method of meal production. Bound lipids were similar for all methods of production but differed in some respects from polar lipids of mature seed.