bluuebunny/crossref_metadata_2025_split huggingface dataset:
A voltage‐controlled varactorless LC‐tank oscillator with a transformer‐feedback technique
Authors: Yang Ching‐Yuan , Tsai Meng‐Ting 
Published: August 2007

AbstractA differential‐voltage‐controlled LC oscillator employs a gm‐tuned technique instead of a varactor is presented, verified, and measured. The design was demonstrated in a standard 0.18‐μm CMOS process. The oscillator can operate at the range of 4.73–5.05 GHz under a 1.8‐V supply voltage. The measured phase noise is −100.76 dBc/Hz at 100‐kHz frequency offset and −121.53 dBc/Hz at 1‐MHz frequency offset away from the 4.73‐GHz carrier with power consumption of 6.48 mW. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2808–2810, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22861
Dual‐bandgap characteristics of spurline filters and its circuit modeling
Authors: Liu Haiwen , Sun Lingling , Shi Zhiguo 
Published: August 2007

AbstractA novel asymmetrical spurline filter is introduced in this article. Its dual‐bandgap characteristics are reported for the first time and can be adjusted by changing the difference between the two spurlines' lengths. Moreover, a simple circuit model is set up for the new filter by using two LCR‐resonators. The proposed spurline filter and its circuit model are discussed and verified by a good agreement between simulations and measurements. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2805–2807, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22862
Self and mutual admittance of CPW‐FED slots on conductor‐backed two‐layer substrate
Authors: Jacobs J. P. 
Published: August 2007

AbstractA characterization of the mutual admittance between CPW‐fed slot antennas on a practically feasible conductor‐backed two‐layer substrate is provided in conjunction with a characterization of isolated slot resonant self‐properties. This data is of interest for linear array design purposes. Numerical results are validated by a measurement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2798–2802, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22866
Monopole‐like antenna for GSM, UMTS, and WLAN applications
Authors: Krzysztofik Wojciech J. 
Published: August 2007

AbstractThe microstrip planar monopole‐like antenna, MPM, capable of multiband operation is proposed. The MPM antenna constructed as microstrip 50‐Ω line loaded by the two planar resonant strips. The strips and the microstripline are photo‐etched on microwave laminate Rogers TMM4. The inner loaded strips resonating as a quarter‐wavelength structure and the outer folded strip resonating as both a quarter‐wavelength and a half‐wavelength structure. The flat (∼0.002 λ) MPM antenna, 12 mm (<0.1 λ) in height and 30 mm in width has been constructed, and the obtained bandwidths cover the four bands of three digital communication systems, centered: at 900 MHz and at 1800 MHz for the GSM, at 1900 MHz for PCS, and at 2050 MHz for UMTS, respectively. Results of design, simulations, and experiments are presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2766–2769, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22867
A fully integrated concurrent dual‐band low‐noise amplifier using InGaP/GaAs HBT technology
Authors: Lin Yu‐Tso , Lu Shey‐Shi 
Published: August 2007

AbstractA fully integrated concurrent dual‐band low noise amplifier using InGaP/GaAs HBT technology is demonstrated for the first time. A new methodology is proposed so as to achieve simultaneous narrow‐band gain and impedance matching at multiple frequencies. The experimental results showed that input return losses of −16.2 and −12.1 dB, voltage gains of 16.8 and 20.1 dB, and noise figures of 2.72 and 2.88 dB were obtained at 2 and 4.6 GHz, respectively with power consumption of 12 mW. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2763–2765, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22868
Capacitively loaded Wilkinson power divider with size reduction and harmonic suppression
Authors: Li Jia‐Lin , Qu Shi‐Wei , Xue Quan 
Published: August 2007

AbstractA compact Wilkinson power divider with harmonic suppression is investigated. The size reduction is achieved by attaching two lumped capacitors in the middle of the two quarter‐wavelength branches of the conventional one. Also, the harmonic suppression is realized as a result of the capacitive loading. Centered at 1.5 GHz, a demonstrator power divider is designed and confirmed by experiments. A size reduction of 48% and nth harmonic suppression are obtained as comparing with the conventional one. Both simulations and measurements are presented, and a good performance is observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2737–2739, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22869
Millimeter wave inspection of concealed objects
Authors: Jaeger Irina , Zhang Lixiao , Stiens Johan , Sahli Hichem , Vounckx Roger 
Published: August 2007

AbstractImaging concealed objects with a millimeter‐wave coherent beam is accompanied with speckle. Two tools were chosen to improve visibility of concealed objects for security or industrial inspection: a speckle contrast image (image processing tool) and a Hadamard diffuser (mechanical tool). We report more then 50% speckle reduction over the full W‐band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2733–2737, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22870
Calibration of accelerometers by using an extrinsic fiber optic probe
Authors: Binu S. 
Published: August 2007

AbstractThis article reports the principle of operation, design aspects, experimentation, and performance of an extrinsic fiber optic probe for the calibration of accelerometers. The device consists of fiber optic transmitter, fiber optic probe, minishaker type 4810, power amplifier type 2706, accelerometer, conditioning amplifier, dynamic signal analyzer, photodiode detector, and a digital multimeter. In this technique, the vibration amplitudes are measured simultaneously using an accelerometer and extrinsic fiber optic probe and the results are compared. The agreement between the results obtained from accelerometer and from the fiber optic probe method shows that the latter can be a promising alternative technique for the measurement of vibration amplitude and hence for the calibration of accelerometers. The stability of the sensor, high sensitivity, and the simplicity of the design, low cost of fabrication, make it suitable for real field applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2700–2703, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.4204
K‐band single balanced mixer for ultra‐wideband radar in 0.18‐μm CMOS technology
Authors: Yu Han‐Yeol , Choi Sung‐Sun , Kim Sung‐Hyun , Kim Yong‐Hoon 
Published: August 2007

AbstractA K‐band single balanced mixer for ultra‐wideband radar using a 0.18‐μm CMOS technology is presented. The designed mixer was applied to LC ladder matching technique on RF port and Marchand type balun with slot pattern ground on LO port for wideband operation, respectively. The mixer achieves 3‐dB bandwidth of 1.4 GHz, power conversion gain of 1.2 dB, and 1‐dB compression point of −3 dBm at RF frequency of 24 GHz and LO frequency of 24.1 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2697–2700, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22872
A novel dual‐band branch line coupler based on strip‐shaped complementary split ring resonators
Authors: Niu Jia‐Xiao , Zhou Xi‐Lang 
Published: August 2007

AbstractIn this article, a novel dual‐band branch line coupler is presented. The dual‐band operation is realized by the LH‐RH transmission line composed of strip‐shaped complementary split ring resonators (CSRRs) and series gap, which can produce LH band around 900 MHz and RH band around 1800 MHz. The performances of the designed device at two operating frequencies are demonstrated by simulated and measured results, which are in good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2859–2862, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22873
Design of UWB planar antenna with subband rejection capability
Authors: Abbosh A. M. 
Published: August 2007

AbstractA simple guideline for designing a compact ultra wideband planar antenna is presented. The proposed antenna has the capability to reject any undesired subband within the whole bandwidth of its operation by incorporating a tuning slot within the radiating structure. Using GML1032 dielectric substrate with a relative permittivity of 3.2, the designed antenna features a compact size of 27 × 27 mm2. Results of the measurement show that the designed antenna has a 10 dB return loss bandwidth from 2.8 GHz to more than 11 GHz excluding any undesired subband, such as the 4.9–5.9 GHz band assigned for IEEE802.11a and HIPERLAN/2. The antenna has near omnidirectional characteristics, and its radiation efficiency is higher than 90% over the whole pass‐band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2855–2859, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22874
Compact Wilkinson power divider with harmonic suppression
Authors: Tu Wen‐Hua 
Published: August 2007

AbstractThis letter presents a compact Wilkinson 3‐dB power divider with the third harmonic suppression. The equivalent T‐shaped microstrip lines are designed to replace the two quarter‐wavelength microstrip lines of the conventional power divider. The equivalent lines achieve the same fundamental responses with the conventional lines while the equivalent lines are bandstop filters at the third harmonic frequency to suppress the third harmonic signals. A 47‐dB third harmonic suppression is achieved. Furthermore, the proposed power divider is compact and achieves 16% size reduction in comparison to the conventional power divider. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2825–2827, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22875
Design of a wide and multiband aperture‐stacked patch antenna with reflector
Authors: Jang Won‐Gyu , Choi Jae‐Hoon 
Published: August 2007

AbstractA novel wide and multiband aperture‐stacked patch antenna is presented. It consists of a single microstrip patch with two pairs of slits, resonant aperture, and a thin reflector patch to reduce the back radiation. By the proper choice of slit length, the required multiband characteristics including the small patch size (∼0.25 λo) are realized. By controlling the spacing between the aperture and reflector, the front‐to‐back ratio at upper frequency band can be optimized. Improved radiation characteristics with high gain (5.9–9.0 dBi) have also been observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2822–2824, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22876
A novel broadband antenna for passive UHF RFID transponders offering global functionality
Authors: Fang Zhijiang , Jin Ronghong , Geng Junping , Sun Jing 
Published: August 2007

AbstractIn this letter, a novel broadband dipole antenna for UHF RFID transponder, which offers global functionality across different regulatory areas is proposed. The proposed antenna has a measured bandwidth from 0.83 to 1 GHz (18.5%) where the power reflection coefficient is below −10 dB for conjugate matching with an EPC class 1 Gen 2 chip, which is sufficient to cover the whole band (0.86–0.96 GHz) regulated by EPC global class 1 Gen 2 protocol (ISO/IEC 18000 6c). Additionally, an equivalent circuit model for such kind of antenna is presented to illustrate the broadband impedance matching characteristic between the antenna and the chip. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2795–2798, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22877
Leitliniengerechter Einsatz der Setrone. Übelkeit und Erbrechen bei onkologischen Therapien
Authors: Nemec Karin 
Published: August 2007

AbstractDie Erfolge in der antiemetischen Therapie der letzten 25 Jahre sind beachtlich: So konnte die Rate der kompletten Emesis‐Unterdrückung von 30 % in den achtziger Jahren auf 70 % in den 1990er Jahren und etwa 85 % im Jahr 2006 verbessert werden. Diese Erfolge wurden durch die Entwicklung potenter, hochspezifischer Antiemetika sowie deren Leitliniengerechten Einsatz zur Prävention von Nausea und Emesis möglich. In der Zukunft wird sich das Hauptaugenmerk auf den Einsatz von Antiemetika bei Kindern, die geschlechtsspezifischen Unterschiede im Ansprechen auf die antiemetische Prophylaxe sowie die noch immer schlecht beherrschbare Form des antizipatorischen Erbrechens richten. Eine weitere Herausforderung sind Patienten, die als Non‐Responder auf die Antiemese zu bezeichnen sind (“therapierefraktäres Erbrechen”). Diesen Patienten könnten die Erkenntnisse aus der pharmakogenomischen Forschung zugute kommen: vor allem Variationen im Metabolismus der Setrone durch CYP450‐Genotypen sowie Variationen im 5‐HT3‐Rezeptor‐Gen könnten für den mangelnden Erfolg der Antiemese verantwortlich sein.
Postoperative Nausea und Emesis (PONV). Pathophysiologie, Risikofaktoren und Therapie
Authors: Wurglics Mario , Spiegl Franz 
Published: August 2007

AbstractDas Management der PONV hat in der letzten Dekade, nicht zuletzt durch die Einführung der Setrone, eine deutliche Qualitätsverbesserung erfahren. Die 5‐HT3‐Antagonisten Ondansetron, Dolasetron, Granisetron und Tropisetron reduzieren außerordentlich effektiv die Inzidenz der PONV und zeichnen sich, im Vergleich zu klassischen Antiemetika, durch ein günstigeres Nebenwirkungsprofil aus. Im Allgemeinen sind die vier Verbindungen äquieffektiv in der Prophylaxe bzw. Therapie der PONV. Geringfügige Unterschiede gibt es bezüglich der Pharmakokinetik und der Pharmakodynamik, was die Variationen in der Wirkdauer, den Einfluss auf die circadiane Rhythmik oder verschieden ausgeprägten Interaktionen erklärt.Generelle Einigkeit besteht heute darüber, dass eine PONV‐Prophylaxe nach Abschätzung des individuellen Risikos des Patienten in drei Stufen durchgeführt wird. Demnach ist eine Prophylaxe bei niedrigem Risiko nicht gerechtfertigt. Erst ab einem mittleren Risiko wird Präventiv mit einem Setron, Dexamethason oder Droperidol therapiert. Bei Hochrisikopatienten kann eine Kombination mehrerer Wirkstoffe in der Prophylaxe notwendig sein.Ist trotz Prophylaxe eine Therapie erforderlich, dann sollte ein Antiemetikum zur Anwendung gelangen, welches noch nicht zuvor als Prophylaktikum eingesetzt wurde. Insgesamt scheinen zur Therapie der PONV geringere Dosierungen als zur Prophylaxe auszureichen.
Ein neues Target für neue Antibiotika – die Glycosyltransferase
Authors: Holzgrabe Ulrike 
Published: August 2007

AbstractWeltweit breiten sich Resistenzen und Multiresistenzen gegen nahezu alle Antibiotika mit großer Geschwindigkeit aus. Deshalb ist die Auffindung neuer Zielstrukturen extrem wichtig. In den letzten 40 Jahren gibt es aber nur zwei Beispiele für Antibiotika mit neuem Wirkmechanismus, und zwar das Oxazolidinon Linezolid und das Lipopeptid Daptomycin. Beide Antiinfektiva sind auf Grund von unerwünschten Wirkungen bzw. des eingeschränktem Wirkspektrum nur in besonderen Fällen einsetzbar.
Humane Stammzellen aus Fruchtwasser
Authors: Winckler Thomas 
Published: August 2007

AbstractPluripotente humane Stammzellen haben ein großes therapeutisches Potential, aber ihre Gewinnung aus Embryonen ist ethisch hoch problematisch. Möglicherweise haben neu entdeckte fötale Stammzellen aus Fruchtwasser ein ähnlich großes Potential wie embryonale Stammzellen.
Eine HIV‐Infektion rückgängig machen?
Authors: Winckler Thomas 
Published: August 2007

AbstractSchon häufiger haben wir an dieser Stelle über neue Strategien zur Therapie der HIV‐Infektion berichtet. Der heilige Gral der AIDS‐Therapie wäre es vielleicht, eine HIV‐Infektion zu heilen, indem man das Virus wieder aus den befallenen Zellen entfernt.
Klinische Forschung unterstützen
Authors: Eggers Thies 
Published: August 2007

AbstractNeues Internetportal vermittelt klinische Studien für Probanden und Patienten. Im Februar startete www.probanden.info, eine Vermittlungsstelle für Probanden und Patienten von klinischen Studien im Internet. Auf dem Portal können Interessenten kostenlos nach aktuellen Studien in ganz Deutschland suchen. Wissenschaftler können über einen Eintrag eine große Zahl potentieller Versuchsteilnehmer erreichen. Ein Informationsbereich bietet neutrale Informationen über Risiken und Nutzen von klinischen Studien und einen Glossar mit Erklärungen von Fachwörtern, die auch der Laie versteht. www.probanden.info wurde in Abstimmung mit der Ethikkommission erstellt.
A novel algesic peptide derived from skin secretions of the frog Amolops loloensis
Authors: Yu Haining , Wang Xu , Liu Jingze , Lai Ren 
Published: August 2007

AbstractSeveral algesic agents including bradykinin and tachykinin have been identified from skin secretions of amphibians. They may act in defensive roles against aggressors. In this study, a novel peptide named Amolos with an amino acid sequence of FLPIVGAKL and isolated from skin secretion of the frog Amolops loloensis, is shown to strengthen nociceptive responses induced by inflammatory factors and strongly inhibit the contraction of isolated ileum. A synthetic peptide based on the sequence obtained showed characterization data identical to those of the isolated material, confirming its structure. These two types of responses seem to be a part of the defensive functions against predators or aggressors. The current results suggest that pharmacological molecules in amphibian skins not only act as innate defense mechanisms against microorganisms but also exert other defensive physiological functions against other aggressors. Copyright © 2007 European Peptide Society and John Wiley & Sons, Ltd.
Soft shell resins for solid‐phase peptide synthesis
Authors: Lee Tae‐Kyung , Choi Jeong‐Hyun , Ryoo Sun‐Jong , Lee Yoon‐Sik 
Published: August 2007

AbstractSoft shell (SS) resins with a lightly or noncross‐linked shell layer were prepared by reducing the amount of cross‐linking agent, divinylbenzene (DVB), during seed suspension polymerization from polystyrene (PS) resin. These SS resins have a lower swelling volume than that produced by normal cross‐linking. Despite its lower swelling, however, SS (10–00) resin, which consists of the 1% DVB‐cross‐linked core and the noncross‐linked surface layer, showed higher efficiency in peptide synthesis compared with 1% DVB‐PS resin and other SS resins. Copyright © 2007 European Peptide Society and John Wiley & Sons, Ltd.
Positional and geometrical isomerization during partial hydrogenation of trilinolein: A comparison of copper and nickel catalysts
Authors: Kirschner E. , Lowrey E. R. 
Published: August 2007

AbstractWe have compared a nickel with a copper catalyst in the formation of some geometrical and positional isomers during the partial hydrogenation of trilinolein. The copper catalyst was found to produce fewer diene isomers than the nickel catalyst at a comparable iodine value. The copper catalyst produced more monoene isomers however, than did the nickel, particularlytrans monoenes. The distribution of the monoene isomers appeared to obey an equilibrium relationship with each other, independent of both iodine value and reaction conditions. We have presented additional evidence to postulate that copper catalysts hydrogenate polyenoic acids by first conjugating the acids. The selectivity of copper catalysts for triene over diene is probably due to the greater ease of conjugation of the triene.
Dimer acid structures: Cyclic structures of clay catalyzed dimers of normal linoleic acid, 9‐cis, 12‐cis‐Octadecadienoic acid
Authors: Wheeler D. H. , Milun A. , Linn F. 
Published: August 2007

AbstractThe clay catalyzed dimer of linoleic acid has been examined by mass spectrometry of the unhydrogenated, the partially hydrogenated and completely hydrogenated dimer. The results show that monocyclic, bicyclic and tricyclic structures are present. Monocyclic structures predominate, bicyclic structures are also prominent, and tricyclic structures are relatively minor. The monocyclic structure is believed to arise from a Diels‐Alder type addition reaction. The bicyclic structure may result from a free radical coupling followed by intramolecular ring closure. The monocyclic structure in the unhydrogenated dimer appears to be mostly a benzene ring with saturated and unsaturated side‐chains. It probably is formed by hydrogen transfer from the Diels‐Alder cyclohexene structure first formed. Little, if any, of the Diels‐Alder dimer structure as such is present. The catalytic linoleate dimer has a higher ratio of monocyclic to bicyclic dimer than does the noncatalytic (thermal) dimer made from normal (nonconjugated) linoleate, while the thermal dimer of a conjugatedtrans‐trans linoleate is exclusively monocyclic. It is suggested that the clay catalyzes conjugation and hence favors the Diels‐Alder reaction, and then catalyzes hydrogen transfer to aromatize the cyclohexene ring.
Unsaturated lipid peroxidation catalyzed by hematin compounds and its inhibition by vitamin E1
Authors: Tappel A. L. , Brown W. Duane , Zalkin H. , Maier V. P. 
Published: August 2007

AbstractEvidence favoring hematin catalysis over autoxidation as the dominant mechanism of lipid peroxidation in animal tissues is presented. Lipid peroxidation in Erlich ascites tumor cells and isolated electron transport particles has been studied. Random destruction of the cytochromes and a loss of catalytic activity correlate with peroxidation of the electron transport particle.Mixtures of α‐, β‐, and γ‐tocopherols show no synergistic effect. Synergism with ascorbate and citrate greatly enhance the antioxidant activity of α‐tocopherol. A tocopherol‐ascorbate‐glutathione‐triphosphopyridine nucleotide couple could act synergistically to inhibit lipid peroxidation in animal tissues.
Yellowing of oil films
Authors: Privett O. S. , Blank M. L. , Covell J. B. , Lundberg W. O. 
Published: August 2007

AbstractResults of studies of the effects of various factors on film yellowing, the mechanism of yellowing, its inhibition, and isolation and characterization of the yellow constituents are reported.Yellowing appears to be a side reaction unrelated to the drying process, but colorless precursors of the yellow compounds are formed as a result of an oxidative process.The formation of the yellow compound was postulated as taking place by the interreaction of the colorless precursors in some type of condensation. Low‐molecular‐weight aldehydes prevented yellowing, possibly by acting as substitutes for some reactant in the condensation reaction.