bluuebunny/crossref_metadata_2025_split huggingface dataset:
MR‐guided intravascular interventions: Techniques and applications
Authors: Bock Michael , Wacker Frank K. 
Published: January 2008

AbstractMagnetic resonance imaging (MRI) offers several advantages over other imaging modalities that make it an attractive imaging tool for diagnostic and therapeutic procedures. This tremendous potential of MRI has provided the rationale for increased attention toward MR‐guided endovascular interventions. MR guidance has been used recently to navigate endovascular catheters and deliver stents, vena cava filters, embolization materials, and septum closure devices. However, its potential goes beyond just copying existing procedures toward the development of new minimally invasive techniques that cannot be performed with conventional guiding techniques. Because of technical limitations and safety issues associated with some of the currently available devices, a limited number of clinical studies have been performed so far. The overall success for this developing field requires considerable interdisciplinary research within both the interventional and the MR community. Only through a combined effort can this complex technology find its way into clinical practice. This review discusses the hardware and software improvements that have helped to advance endovascular interventions under MR imaging guidance from a pure research tool to become a clinical reality. In addition, technical and safety issues specific to endovascular MR image guidance will be described and practical applications will be shown that take advantage of the benefits of MR for endovascular interventions. J. Magn. Reson. Imaging 2008;27:326–338. © 2008 Wiley‐Liss, Inc.
MRI‐guided interventions of the musculoskeletal system
Authors: Smith Kevin A. , Carrino John 
Published: January 2008

AbstractMRI has become the modality of choice for many diagnostic questions in musculoskeletal radiology. Naturally, with the increasing role of MRI in diagnosis of musculoskeletal conditions, clinicians have been eager to explore the possibility of using MR guidance for musculoskeletal procedures. Researchers are actively investigating the utility and practicality of MRI compared with more established modalities for procedure guidance such as computed tomography, fluoroscopy, and ultrasound. Early studies have demonstrated the safety and feasibility of MR guidance for biopsies, spine procedures, cyst aspirations, therapeutic injections, and tumor ablation. Applications in the musculoskeletal system are likely to expand as technology improves and clinicians gain more experience. Hybrid X‐ray fluoroscopy/MR imaging systems hold great promise for the future of musculoskeletal intervention by combining the excellent temporal and spatial resolution of X‐ray with the anatomic detail provided by MRI. J. Magn. Reson. Imaging 2008;27:339–346. © 2008 Wiley‐Liss, Inc.
Direct Synthesis of PVA‐g‐PDMS in Microsuspension
Authors: Pouget Emmanuel , Garcia Erlea Holgado , Ganachaud François 
Published: January 2008

AbstractThe synthesis of P(VA‐co‐VAc)‐graft‐PDMS copolymers has been achieved in microsuspension by direct reaction between an epoxy‐terminated PDMS and some pendant alcohol groups in P(VA‐co‐VAc). In this synthesis, the copolymer is used both as dispersant and reactant. The hydrophilic/hydrophobic character of the final material can be varied at will by incorporating various contents of epoxy‐functionalized PDMS through optimized reaction conditions. The final composition was determined by TGA and 1H NMR. Products prepared from monofunctional PDMS were easily redispersed in water whereas a film of crosslinked materials, arising from difunctional PDMS, showed the best waterproofing as shown by contact angle analysis.magnified image
Synthesis of Peptide/Polymer Conjugates by Solution ATRP of Butylacrylate Using an Initiator‐Modified Cyclic D‐alt‐L‐Peptide
Authors: Loschonsky Sidar , Couet Julien , Biesalski Markus 
Published: January 2008

AbstractPeptide/polymer hybrid molecules consisting of poly(butylacrylate) chains, covalently attached to a cyclic D‐alt‐L‐octapeptide, were prepared by the in situ ATRP of butylacrylate using a cyclic peptide that was modified at three distinct positions with an initiator group. The apparent molar mass of the peptide/PBA hybrid molecules could be controlled through adjusting the reaction conversion. The hybrid molecule showed a solvent induced self‐assembly, which yielded rod‐like nanostructures having a core shell morphology with an internal beta‐sheet peptide assembly surrounded by a soft PBA exterior.magnified image
Modifizierte Nickelbasisstandardlote für korrosiv belastete Bauteile
Authors: Wielage B. , Hoyer I. 
Published: January 2008

AbstractZum Fügen korrosiv hoch beanspruchter Bauteile, wie z. B. Industrie‐Wärmetauscher, werden häufig Nickelbasislote verwendet. Bei herkömmlichen Ni‐Basis‐Lotlegierungen mit Zusätzen von Bor und Silizium kommt es beim Löten von chromhaltigen Stählen aufgrund der hohen Affinität von Chrom zu Bor häufig zur Bildung von Chromboriden, die sich insbesondere an den Korngrenzen ausscheiden. Das führt zu einer Chrom‐Verarmung im Grundwerkstoff und kann – sinkt der Chromgehalt unter den kritischen Wert von 13 % ab – den Verlust der Korrosionsbeständigkeit nach sich ziehen.Durch Modifikation mit Chrom und Molybdän wurde die Gefügeausbildung der Lötnähte an nichtrostenden austenitischen Stählen derart verändert, dass keine durchgehenden Sprödphasen mehr auftraten. Es wurde gezeigt, dass die Wahl der Zusatzwerkstoffe und die Parameter Löttemperatur, Aufheiz‐ und Abkühlgeschwindigkeit einen wesentlichen Einfluss auf die Gefügeausbildung und damit auf die mechanischen und korrosiven Eigenschaften der Verbindungen haben.
Clinical assessment of CYP2D6‐mediated herb–drug interactions in humans: Effects of milk thistle, black cohosh, goldenseal, kava kava, St. John's wort, andEchinacea
Authors: Gurley Bill J. , Swain Ashley , Hubbard Martha A. , Williams D. Keith , Barone Gary , Hartsfield Faith , Tong Yudong , Carrier Danielle J. , Cheboyina Shreekar , Battu Sunil K. 
Published: January 2008

AbstractCytochrome P450 2D6 (CYP2D6), an important CYP isoform with regard to drug–drug interactions, accounts for the metabolism of ∼︁30% of all medications. To date, few studies have assessed the effects of botanical supplementation on human CYP2D6 activityin vivo. Six botanical extracts were evaluated in three separate studies (two extractsperstudy), each incorporating 16 healthy volunteers (eight females). Subjects were randomized to receive a standardized botanical extract for 14 days on separate occasions. A 30‐day washout period was interposed between each supplementation phase. In study 1, subjects received milk thistle (Silybum marianum) and black cohosh (Cimicifuga racemosa). In study 2, kava kava (Piper methysticum) and goldenseal (Hydrastis canadensis) extracts were administered, and in study 3 subjects received St. John's wort (Hypericum perforatum) andEchinacea(Echinacea purpurea). The CYP2D6 substrate, debrisoquine (5 mg), was administered before and at the end of supplementation. Pre‐ and post‐supplementation phenotypic trait measurements were determined for CYP2D6 using 8‐h debrisoquine urinary recovery ratios (DURR). Comparisons of pre‐ and post‐supplementation DURR revealed significant inhibition (∼︁50%) of CYP2D6 activity for goldenseal, but not for the other extracts. Accordingly, adverse herb–drug interactions may result with concomitant ingestion of goldenseal supplements and drugs that are CYP2D6 substrates.
Aperture‐coupled cavity‐fed back‐to‐back microstrip directional coupler
Authors: Nam Sang Ho , Nam Kyung Min , Kim Chul Un , Kim Jeong Phill 
Published: January 2008

AbstractAn analysis and design theory of an aperture‐coupled cavity‐fed back‐to‐back microstrip directional coupler is presented for efficient and optimized design. For this purpose, an equivalent network is developed, and a simple yet accurate circuit element value calculation is described. Design equations of the coupler are derived based on the equivalent circuit. To determine various structural design parameters, the evolutionary hybrid optimization method based on a genetic algorithm and the Nelder–Mead method is used. As a validation check of the proposed theory and optimized design method, a 10 dB directional coupler was designed and fabricated. The measured coupling was 10.3 dB at 3 GHz, and the return loss and isolation were 31.8 dB and 30.5 dB, respectively. The directional coupler also showed very good quadrature phase characteristics. Good agreements between the measured and the design specifications fully validate the proposed network analysis and design procedure. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 551–555, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23145
Particle swarm optimization with tournament selection for linear array synthesis
Authors: Pérez J. R. , Basterrechea J. 
Published: January 2008

AbstractThe modern heuristic particle swarm optimization technique (PSO) has received great attention in many applications and research areas over the last few years, and novel PSO‐based algorithms are continuously emerging to improve its overall performance. In this article, classical PSO schemes are modified by introducing a selection operator widely used in evolutionary algorithms such as genetic algorithms, and these novel hybrid algorithms are applied to linear array synthesis using complex weights and considering directive element patterns to weigh up the improvements achieved. Up to eight classical PSO schemes are addressed by the PSO suite tested in this work, including PSO with synchronous and asynchronous updates of the swarm along with global and local topologies for both, real‐valued and binary encoding algorithms. Furthermore, representative results comparing both classical PSO schemes and the new hybrid approaches are reported and discussed, demonstrating that the selection operator clearly increases search pressure over the swarm, speeding up convergence for certain specific schemes. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 627–632, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23248
A transformer‐coupled LC‐tank injection locked frequency divider
Authors: Jang S.‐L. , Chen Fei‐Hung , Huang Jhin‐Fang 
Published: January 2008

AbstractThis article designs an injection locked frequency divider (ILFD) based on the direct injection technique and transformer‐coupled VCO topology. At the supply voltage of 3.3 V, the tuning range of the free‐running ILFD is from 2.47 to 2.32 GHz, about 150 MHz, and the locking range of the ILFD is from 4.58 to 5.09 GHz, about 510 MHz at the injection signal power of 0 dBm. The ILFD dissipates 188 mW at 3.3 V supply voltage and was fabricated in the TSMC 0.35 μm CMOS 2P4M CMOS technology. At the tuning voltage of 2.5 V, the measured phase noise of free‐running ILFD is about −116.7 dBc/Hz at 1 MHz offset frequency from 2.4 GHz, and the phase noise of the locked ILFD is about −128.6 dBc/Hz, while the input signal is with a power of −4 dBm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 592–595, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23150
Vector sequence accelerator for solving problems in computational electromagnetics using the method of moments
Authors: Singh Surendra , Ritu Singh  
Published: January 2008

AbstractThe solution of an integral equation using the method of moments leads to a system of linear equations. The resulting system of equations can be solved by direct and iterative methods. This paper introduces an iterative method utilizing Brezinski's θ algorithm. The algorithm has previously been used in accelerating the convergence of a scalar sequence. With the aid of two integral equations, it is shown that the algorithm is able to accelerate the convergence of a vector sequence resulting in the solution vector. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 589–592, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23155
Slot antenna for ultra‐wideband communications
Authors: Huang Chih‐Yu , Tsai Chia‐Chou , Kuo Jieh‐Sen 
Published: January 2008

AbstractA novel compact slot antenna has been proposed for ultra‐wideband (UWB) communications. The keyhole‐shaped slot antenna consists of an indented circular‐pie slot and a rectangular slot. The UWB (3.1–10.6 GHz) property is achieved by choosing suitable cutting pie and rectangular slot. Details of the proposed antenna design and measured results are presented and discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 616–617, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23159
A novel miniaturized hybrid ring using complementary split ring resonators
Authors: Niu Jia‐Xiao , Zhou Xi‐Lang 
Published: January 2008

AbstractIn this article, a novel miniaturized hybrid ring operating at 2 GHz is presented. By replacing the 270° branch line of conventional hybrid ring by −90° left‐handed branch line realized by complementary split ring resonators (CSRRs), the occupied area of our proposed hybrid ring can be reduced by 60% from that of the conventional one. The performances are demonstrated by simulated and measured results, which are in good agreement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 632–635, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23170
Novel ballast resistor network for power amplifier design
Authors: Gao Huai , Wang Rong , Xue Hongxi , Li G. P. 
Published: January 2008

AbstractA novel ballast resistor network is proposed to achieve a better thermal management in HBT power cells without degrading the RF performances. Experiments were conducted on two HBT power amplifiers. They occupy same area. One is designed using conventional ballast network. The other uses proposed novel network. Temperature comparisons were made based on the same current density. Infrared camera images show that a more uniform temperature distribution is obtained in novel ballast network power amplifier. Our results demonstrate that the proposed novel ballast network has promising applications in high power amplifiers. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 711–713, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23174
Design and development of inclined and V‐slot microstrip antennas for circular polarization and omni‐directional radiation pattern
Authors: Satnoor S. K. , Vani R. M. , Konda R. B. , Mulgi S. N. , Hunagund P. V. 
Published: January 2008

AbstractA low profile omni‐directional and circularly polarized one pair inclined slot microstrip antenna (ISMSA) and V‐slot microstrip antenna (VSMSA) are proposed. The one pair ISMSA gives left‐hand circular polarization (LHCP), right‐hand circular polarization (RHCP), and nearly omni‐directional radiation pattern. However, by modifying the inclined slots of ISMSA in the form of V, the antenna gives improved omni‐directional radiation pattern with LHCP and RHCP. The design concept of these antennas is given and the experimental results are discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 708–711, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23177
Linearity‐optimized GaN HEMT Doherty amplifiers using derivative superposition technique for WCDMA applications
Authors: Lee Yong‐Sub , Lee Mun‐Woo , Jeong Yoon‐Ha 
Published: January 2008

AbstractGallium nitride (GaN) high‐electron mobility transistor (HEMT) Doherty amplifiers with the optimized linearity for wide‐band code division multiple access (WCDMA) applications are represented. At a 7‐dB back‐off output power, the measured single‐carrier WCDMA results show two‐way and three‐way GaN HEMT Doherty amplifiers with an adjacent channel leakage ratio (ACLR) of −43.2 and −48.2 dBc at ±2.5 MHz offset frequency with a drain efficiency of 43.1% and 30.9%, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 701–705, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23181
Design of ultra‐wideband bandpass filter using step‐impedance four‐mode resonator and aperture‐enhanced coupled structure
Authors: Cai Peng 
Published: January 2008

AbstractA novel ultra‐wideband (UWB) bandpass filter (BPF) is proposed and implemented by using a four‐mode resonator, which has four resonant frequencies within the passband of the filter. By enhancing the coupling between the resonator and the input/output feed lines, an UWB BPF with six transmission poles is realized, although only one resonator is utilized. To alleviate the requirement on fabrication precision, aperture‐enhanced coupled lines are introduced to replace the parallel‐coupled lines in the filter. The fabricated filter exhibits good performances and the measured results show good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 696–699, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23184
A dual directional coupler with unique asymmetric coupling values at 1.7–2 GHz
Authors: Jung Jin‐Woo , Roh Hyoung‐Hwan , Park Jun‐Seok 
Published: January 2008

AbstractRadio characteristic evaluations of each component through the entire communication system can be performed by using the signal sampling methods, which give information of the precise statistics and high qualified specifications. Particular modern trends on electrical devices demand extremely miniaturized dimensions to meet the hand‐held system units, such as personal communication services, mobile RFID applications and other possible products including crucial factors of low‐profile and mobility. It is eventually aimed to avoid unnecessary waste of manufacturing products, and guarantee the mobility, ease of use and so forth. Thus the multi‐mode electrical devices providing numerical advances in a single structure are needed and this is the motivation of further experiments. In this study, we propose a novel dual directional coupler design schemes including derivative calculations and its completely manufactured prototype. It has been designed by promoting three parallel coupled transmission lines with novel mathematic formula and auxiliary simulation systems. Outstanding technical features can be high isolation and directivity characteristics and these will be illustrated within the statistical tables and graphics for verification. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 775–780, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23188
Design of a novel ultra‐wide stopband lowpass filter using H‐defected ground structure
Authors: Boutejdar A. , Elsherbini A. , Omar A. 
Published: January 2008

AbstractA novel compact wideband high‐rejection LPF using H‐shaped defected ground structure (DGS) elements is presented. The performance of the new H‐DGS was analyzed together with its effect on the filter performance. A wide rejection band and steep transition region was obtained. The filter was fabricated and the measurement and simulation results showed good agreement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 771–775, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23189
Internal hybrid loop/monopole slot antenna for quad‐band operation in the mobile phone
Authors: Wu Chih‐Hsien , Wong Kin‐Lu 
Published: January 2008

AbstractA novel printed hybrid loop/monopole slot antenna for quad‐band operation in the mobile phone is presented. The proposed hybrid antenna is composed of a meandered loop antenna and a monopole slot antenna, and can generate two wide operating bands centered at about 900 and 1900 MHz to cover GSM850/900/DCS/PCS operation. The hybrid antenna is easily fabricated by bending the meandered loop antenna at low cost, which is connected to and centered at the top edge of the system ground plane where a straight monopole slot is embedded. With quad‐band operation obtained, the hybrid antenna, however, occupies a small volume of 5.5 × 6 × 60 mm3 or 1.98 cm3 only inside the mobile phone. A 50‐Ω microstrip feedline is used to excite the meandered loop antenna and the monopole slot antenna in series. Detailed results and parametric studies of the proposed hybrid antenna are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 795–801, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23201
A band‐notched swallow‐tailed planar monopole antenna for UWB application
Authors: Zhou Haijin , Liu Qizhong , Sun Baohua , Yang Yanjiong 
Published: January 2008

AbstractIn this article, we propose a swallow‐tailed UWB planar monopole antenna that exhibits a notch characteristic in the 5‐GHz WLAN band (5.15–5.825 GHz) by inserting a hat‐shaped slot into the antenna. The effects of the length of the slot on the notched frequency band are analyzed. The radiation patterns of the proposed antenna are also measured and the gains are shown to be flat, except in the notched frequency band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 793–795, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23202
Stoer‐Bulirsch adaptive frequency sampling method for efficient analysis of frequency selective surfaces
Authors: Chen J. Q. , Chen R. S. , Liu Z. W. 
Published: January 2008

AbstractIn this article, a Stoer‐Bulirsch adaptive frequency sampling method is proposed in conjunction with the method of moments to analyze the broadband electromagnetic wave scattering from frequency selective surfaces. On comparing with other sampling methods, the Stoer‐Bulirsch algorithm is a recursive tabular method and requires no matrix inversion. Therefore, it can obtain a rational interpolation function without suffering from singularity problems. Furthermore, since final results are obtained by interpolating with the adaptive frequency sampling method, no more information is needed except the sampled frequency and its true value. Hence, it can be widely used in most of the electromagnetic simulations. Numerical results show that our proposed sampling strategy performs well in terms of both simulation time and computation accuracy. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 755–758, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23204
Adaptive sampling cubic‐spline interpolation method for efficient calculation of monostatic RCS
Authors: Liu Z. W. , Chen R. S. , Chen J. Q. 
Published: January 2008

AbstractAn adaptive strategy is combined with the cubic‐spline interpolation method in this article to efficiently calculate the scattering from electrically large objects. The cubic‐spline interpolation method is used to approximate the monostatic radar crosssection (RCS) curve on a set of nonuniform sampling nodes and the adaptive strategy is employed to generate new sampling points automatically. Unlike asymptotic waveform evaluation method, the derivatives are not required for the novel interpolation method. Numerical results demonstrate that the proposed method is able to rigorously approximate the result with less computation time when compared with conventional interpolation methods. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 751–755, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23211