bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of bandstop filters using discrete‐time notch filter, two‐section stub, and frequency‐scaling method
Authors: Hsue Ching‐Wen , Chen Yen‐Jen , Tsai Yi‐Hsien 
Published: March 2007

AbstractA new method for the design of a bandstop filter is presented. The two‐section open stub is employed to emulate a notch filter in the discrete‐time domain. A cascade connection of two‐section open stubs with proper frequency scaling serves to represent a bandstop filter of wider stopband bandwidth. Experimental results are presented to illustrate the validity of this design method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1098–1101, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22356
A simple design cylindrical dielectric resonator antenna with wide aperture‐coupled for broadband applications
Authors: Huang Tsung‐Hui , Chen Han‐Jan , Chen Tung‐Ming , Chen Lih‐Shan , Liu Chien‐Chih , Hung Chen‐I , Wang Yeong‐Her , Houng Mau‐Phon 
Published: March 2007

AbstractIn this paper, a simple design cylindrical dielectric resonator antenna (CDRA) with wide aperture‐coupled for broadband applications has been proposed. For improving impedance matching, microstrip feed‐line was designed as a fork‐like to obtain two resonant modes excitation and lead to a wider impedance bandwidth. Experimental results indicate that the measured bandwidth is 10.6% (S11 < −10 dB) with broadside radiation pattern. Additionally, the proposed antenna gain is near 7.9 dBi. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49:1064–1067, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22359
Perfectly matched layer for two‐dimensional unconditionally stable FDTD method based on approximate Crank‐Nicolson scheme
Authors: Lin Hai , Ding Ping‐Ping , Wang Gaofeng 
Published: March 2007

AbstractA perfectly matched layer (PML) is constructed for two‐dimensional (2D) unconditionally stable (US) FDTD method based on an approximate Crank‐Nicolson scheme. This novel PML preserves unconditional stability of the 2D US‐FDTD method and has very good absorbing performance. Numerical results are included to illustrate effectiveness and performance of this new PML. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1178–1182, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22364
LTCC bandpass filter using 3D coupled helical inductors
Authors: Choi SeungChul , Youm JungEun , Heo Keun , Lim JuHwan , Park ChulSoon , Hwang SungWoo 
Published: March 2007

AbstractA new low‐temperature co‐fired ceramic (LTCC) bandpass filter using three‐dimensionally coupled helical inductors is presented. The resonator is a via‐connected multilayer helical inductor and the filter uses mixed coupling between face‐to‐face inductors. The fabricated filter exhibits the center frequency of 5.8 GHz, 3‐dB bandwidth of 800 MHz, and the insertion loss of 1.9 dB. The size of the active region is 1.7 × 2.3 × 0.8 mm3. The measured results are consistent with the three‐dimensional electromagnetic simulation and the equivalent circuit modeling. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1146–1147, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22366
Design of a low‐profile modified U‐slot microstrip antenna using PSO based on IE3D
Authors: Liu X. F. , Jiao Y. C. , Zhang F. S. , Chen Y. B. 
Published: March 2007

AbstractIn this article, a novel particle swarm optimization method based on IE3D is used to design a low‐profile modified U‐slot microstrip antenna. The antenna is printed on a substrate thickness of 0.008λ. Details of the particle swarm optimization method based on IE3D are presented. Experimental results including return loss and far field patterns of the antenna are given. The obtained antenna bandwidth (S11 = −10 dB) can be as large as 1.85 times that of a corresponding unslotted rectangular microstrip antenna at 2.4 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1111–1114, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22369
All‐fiber multipoint VISAR
Authors: Hong Guang‐Wei , Jia Bo 
Published: March 2007

AbstractA novel all‐fiber multipoint velocity interferometer system for any reflectors (VISAR) is developed and demonstrated. The setup employs single‐mode fibers and fiber couplers to create more probing ports based on the all‐fiber VISAR. A time division multiplexing scheme is implemented to align the interfering signals of different points in time sequence. A prototype two‐point all‐fiber VISAR is established and used to measure velocities on the same specimen impacted by the split Hopkinson pressure bar. A preliminary experiment results show good matches with the expected theoretical performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1199–1201, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.10 02/mop.22370
Coherent combining of Q‐switched fiber lasers based on a fiber grating ring mirror
Authors: Dai Wei , Wengang Guo , Hongjie Wang , Fuyun Lu 
Published: March 2007

AbstractA coherent combining of two Q‐switched fiber lasers based on a multiarm resonator of interferometric configuration is demonstrated. The lasers share a same fiber grating ring mirror as a Q‐switch and generate a stable pulse series. Under a 23‐KHz pulse repetition, a 10‐mW average output power is obtained and the pulse peak power is 46 mW. The combining efficiency of the two fiber lasers reaches 90%. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49:1196–1199, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22371
Biosensor based on two‐dimensional photonic lattice
Authors: Irawan Rudi , Zhang Dianwen , Tjin Swee Chuan , Yuan Xiaocong 
Published: March 2007

AbstractA nanotechnology technique for biophotonics applications is proposed and simulated. The comparison of transmittance spectra of the two‐dimensional photonics lattices with different dielectric constant of the circular rods or holes, which show slab structures of two‐dimensional photonic lattices composed of a triangular or square array of circular rods or holes, are obviously feasible to be applied for biosensing in lab‐on‐chip applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1171–1175, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22372
Q and bandwidth of electrically small antennas
Authors: Hansen R. C. 
Published: March 2007

AbstractThe relation of Q and half‐power bandwidth for antennas, Q = 1/BW, is well known. Here it is shown that 1/Q gives an accurate bandwidth for electrically small dipoles and loops. Bandwidths from 1/Q are compared with exact bandwidths, using a sinusoidal current computer model for dipoles, and a constant current model for loops. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1170–1171, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22373
A new derivation for the coefficients of the scattering dyadic Green′s function in spherically layered media
Authors: Kim Yonghoon , Chae Heeduck , Nam Sangwook 
Published: March 2007

AbstractThe dyadic Green's function in spherically layered media is considered by assuming that source and field points can be located anywhere. After manipulations from the expression of the dyadic Green's function based on the reflections and transmissions of the scalar waves, the dyadic Green's function in terms of the spherical vector wave functions is newly constructed and also the coefficients of the scattering dyadic Green's function are derived in a simple form. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1142–1143, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22374
Time‐domain integral equation solvers using quadratic B‐spline temporal basis functions
Authors: Wang P. , Xia M. Y. , Jin J. M. , Zhou L. Z. 
Published: March 2007

AbstractA novel numerical scheme that employs quadratic B‐spline functions as temporal basis functions is proposed for solving time‐domain integral equations (TDIE) of electromagnetic scattering. Because of the compact support of these new temporal basis functions, the resulting time‐domain integral equations solution is efficient in terms of memory usage and computation time. Numerical examples of scattering by both conducting and dielectric objects show that the solution is also stable and accurate. Compared with the Lagrange interpolating functions of the same order, the quadratic B‐spline functions, being complete to the second order, yield a better accuracy in the time‐domain integral equations solution of scattering problems. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1154–1159, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22385
Novel switched sector beam planar UWB antenna
Authors: Yao Yuan , Feng Zhenghe 
Published: March 2007

AbstractA planar Vivaldi array antenna that can achieve four sector radiation patterns in the azimuth plane is presented. Prototypes of the proposed antenna operating within 3.1–10.6 GHz for ultrawideband applications were designed and constructed. Measured and simulated results are used to demonstrate the performance of the antenna. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1185–1187, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22388
Four‐wave mixing characteristics in SOAs with optimum time‐delays between pump and probe pulses
Authors: Das Narottam Kumar , Karmakar Nemai Chandra , Yamayoshi Yasuhiro , Kawaguchi Hitoshi 
Published: March 2007

AbstractWe have analyzed the four‐wave mixing (FWM) characteristics in semiconductor optical amplifiers (SOAs) with optimum time‐delays between pump and probe pulses by the finite‐difference beam propagation method. This study is very important to achieve the high FWM conversion efficiency and to clarify the timing jitter. From the simulations, we have clarified that the FWM conversion efficiency increases with optimum time‐delays between pump and probe pulses in SOA for short optical pulses. In the experiment, we have found the similar tendency. Therefore, we have obtained an excellent agreement between the simulation and experimental results of high FWM conversion efficiency in SOAs with optimum time‐delays between pulses. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1182–1185, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22389
Analysis and design of AlGaN/GaN HEMT resistive mixers
Authors: Chang Tienyu , Wu Wenhsing , Lin Jenshan , Jang Soohwan , Ren Fan , Pearton Stephen , Fitch Robert , Gillespie James 
Published: March 2007

AbstractIn this article, resistive mixers using AlGaN/GaN high electron‐mobility transistor (HEMT) devices are examined. Models of the GaN devices in linear region were created. Behavior of conversion loss with LO power is well predicted using the developed model. Three down‐conversion mixers were designed for RF frequency of 1.7 GHz and IF frequency of 200 MHz using LO frequency of 1.9 GHz. GaN HEMT devices with gate width of 300 μm, and gate lengths of 1.2, 1.0, and 0.75 μm were used in the mixers. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1152–1154, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22390
The design and fabrication of multitransmission‐band optical FBG filter with ultranarrow wavelength spacing
Authors: Xia Li , Shum Ping , Cheng Teehiang 
Published: March 2007

AbstractOptical filters with ultranarrow wavelength spacing of 0.068, 0.052, and 0.032 nm, are designed and fabricated on uniform fiber Bragg grating (FBG). Moreover, triple‐, and quadruple‐transmission bands with wavelength spacing of 0.050, 0.046 nm, respectively, are achieved through introducing three and four phase shifts along the fiber Bragg grating. These filters can be applied in the ultranarrow wavelength spacing filtering, photonic generation of microwave signal, multiwavelength distributed feedback Bragg lasing, etc. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1122–1125, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22392
High‐gain high‐isolation CMFB stacked‐LO subharmonic gilbert mixer using SiGe BiCMOS technology
Authors: Wu T. H. , Meng C. C. , Huang G. W. 
Published: March 2007

AbstractA 5.2‐GHz SiGe BiCMOS stacked‐LO‐stage CMFB (common mode feedback) subharmonic mixer is demonstrated in this article. The stacked‐LO‐stage and the active loads are used to improve the 2LO‐RF isolation and the conversion gain, respectively. The SiGe mixer includes five levels of transistors stacked together at the supply voltage of 3.3 V because of the low knee‐voltage characteristic of the SiGe HBTs (heterojunction bipolar transistors). The mixer demonstrated achieves 23 dB conversion gain and −78 dB 2LO‐RF isolation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1214–1216, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22398
Microstrip antennas with loaded trapezoidal slots for broadband tactical wireless communications
Authors: Rao Qinjiang , Denidni Tayeb A. 
Published: March 2007

AbstractIn this letter, a broadband microstrip antenna suitable for tactical wireless communication at 1.35–1.75 GHz was proposed by loading trapezoidal slots. Compared with rectangular slotted patch antennas, the proposed design achieved a smaller size and a larger bandwidth. In addition, due to more design parameters, better antenna performances can be obtained by optimizing these parameters. Simulated and measured results validate the proposed design. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1210–1212, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22400
Erratum: Algorithm study of the space transformation factor in the transformed‐space nonuniform pseudo‐spectral time‐domain scheme
Authors: Liu Xiaoping , Chen Yinchao , Wu Xian , Tong Ming‐Sze , Huray Paul G. 
Published: March 2007

AbstractOriginally published Microwave Opt Technol Lett 48: 2367–2372, 2006. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1225, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22478
Functional imaging with Turbo‐CASL: Transit time and multislice imaging considerations
Authors: Lee Gregory R. , Hernandez‐Garcia Luis , Noll Douglas C. 
Published: March 2007

AbstractThe optimal use of turbo continuous arterial spin labeling (Turbo‐CASL) for functional imaging in the presence of activation‐induced transit time (TT) changes was investigated. Functional imaging of a bilateral finger‐tapping task showed improved sensitivity for Turbo‐CASL as compared to traditional CASL techniques for four of six subjects when scanned at an appropriate repetition time (TR). Both experimental and simulation results suggest that for optimal functional sensitivity with Turbo‐CASL, the pulse TR should be set to a value that is 100–200 ms less than the resting‐state TT. Simulations were also run to demonstrate the differences in TT sensitivity of different slices within a multislice acquisition, and the signal loss that is expected as the number of slices is increased. Despite the lower baseline ASL signal provided by the Turbo‐CASL acquisition, one can achieve equal or improved functional sensitivity due in part to the signal enhancement that accompanies the decrease in TT upon activation. Turbo‐CASL is thus a promising technique for functional ASL at higher temporal resolution. Magn Reson Med 57:661–669, 2007. © 2007 Wiley‐Liss, Inc.
Rapid quantitation of cardiovascular flow using slice‐selective fourier velocity encoding with spiral readouts
Authors: Carvalho Joao L. A. , Nayak Krishna S. 
Published: March 2007

AbstractAccurate flow visualization and quantitation is important for the assessment of many cardiovascular conditions such as valvular stenosis and regurgitation. Phase contrast based methods experience partial volume artifacts when flow is highly localized, complex and/or turbulent. Fourier velocity encoding (FVE) avoids such problems by resolving the full velocity distribution within each voxel. This work proposes the use of slice selective FVE with spiral readouts to acquire fully localized velocity distributions in a short breath‐hold. Scan‐plane prescription is performed using classic protocols, and an automatic algorithm is used for in‐plane localization of the flow. Time and spatially‐resolved aortic valve velocity distributions with 26‐msec temporal resolution and 25 cm/sec velocity resolution over a 600 cm/sec field‐of‐view were acquired in a 12‐heartbeat breath‐hold. In carotid studies, scan time was extended to achieve higher spatial resolution. The method was demonstrated in healthy volunteers and patients, and the results compared qualitatively well with Doppler ultrasound. Acquisition time could be reduced to 7 heartbeats (a 42% reduction) using partial Fourier reconstruction along the velocity dimension. Magn Reson Med 57:639–646, 2007. © 2007 Wiley‐Liss, Inc.
Advantageous application of a surface coil to EPR irradiation in overhauser‐enhanced MRI
Authors: Matsumoto Shingo , Yamada Kenichi , Hirata Hiroshi , Yasukawa Keiji , Hyodo Fuminori , Ichikawa Kazuhiro , Utsumi Hideo 
Published: March 2007

AbstractThe present study describes the advantageous application of a surface coil to electron paramagnetic resonance (EPR) irradiation in Overhauser‐enhanced MRI (OMRI). OMRI is a double‐resonance method for imaging free radicals based on the Overhauser effect. Proton NMR images are recorded without and with EPR irradiation of the free radical resonance, which results in a difference proton image that shows signal enhancement in spatial regions that contain the free radical. To obtain good signal enhancement in OMRI, very high RF power and a long EPR irradiation time are required. To improve sensitivity and shorten the image acquisition time, especially for localized (and topical) applications, we developed and tested a surface‐coil‐type EPR irradiation coil. Theoretical calculations and experimental data showed that EPR irradiation through the surface coil could ameliorate the localized Overhauser enhancement, which was related to the ratio of B1 surface coil/B1 volume coil in the region of interest (ROI), as expected. The increased sensitivity could also be converted into a shortened EPR irradiation time, resulting in fast data acquisition. For biomedical applications, the use of a surface coil (as opposed to a conventional volume coil) could decrease the total RF power deposition in the sample required to obtain the same Overhauser enhancement in the ROI. Magn Reson Med 57:806–811, 2007. © 2007 Wiley‐Liss, Inc.
Studies on polymers and composites from lignin and fiber derived from sugar cane
Authors: Doherty William , Halley Peter , Edye Les , Rogers David , Cardona Francisco , Park Yoosup , Woo Tim 
Published: March 2007

AbstractSugarcane fiber (i.e. bagasse) lignin has a larger fraction of aromatics unsubstitution in the ortho position than hardwood or softwood lignin and hence has the greater ability to be derivatized. Furthermore, organosolv lignin has a higher purity than sulfonated and kraft lignins. This work examines the purification of organosolv lignin derived from bagasse and the physico‐chemical properties of the lignin and lignin‐phenol formaldehyde (PF) resin coatings, and composites.The wetability tests have shown that lignin and lignin‐PF resin films are effective water barrier coatings, though the contact angles of lignin‐PF resin films were considerably less than the wax films. The overall mechanical properties (i.e. peak stress, peak strain and modulus) of the bagasse fiber composites were lower than the values obtained with the composites without the inclusion of bagasse fiber. Copyright © 2007 John Wiley & Sons, Ltd.
Rapid prenatal diagnosis of Duchenne muscular dystrophy with gene duplications by ion‐pair reversed‐phase high‐performance liquid chromatography coupled with competitive multiplex polymerase chain reaction strategy
Authors: Huang Wan‐Yi , Hung Chia‐Cheng , Lee Chien‐Nan , Su Yi‐Ning , Chen Chih‐Ping 
Published: March 2007

AbstractDuchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD) are caused by various mutations in the dystrophin gene. Rapid prenatal diagnosis of DMD with gene duplications is difficult due to limitation in gene dosage determination and the requirement for a known disease‐causing mutation in the pedigree to achieve a rapid and accurate diagnosis. We report, here, a case with rapid prenatal diagnosis of DMD‐affected male with gene duplications in the absence of a known disease‐causing variation in the pedigree by using ion‐pair reversed‐phase high‐performance liquid chromatography (IP‐RP‐HPLC) coupled with competitive multiplex polymerase chain reaction (PCR) protocol. In cases with clinical diagnosis of DMD/BMD, this test should identify greater than 92% of disease‐causing DNA variants. The postnatal genetic diagnosis of this case and the same disease‐causing mutations subsequently identified in other members of the pedigree confirmed the accuracy of competitive multiplex PCR/IP‐RP‐HPLC assay in direct prenatal diagnosis of DMD. Copyright © 2007 John Wiley & Sons, Ltd.
Interfacial and diffusion phenomena in emulsion polymerisation
Authors: Brooks B. W. 
Published: March 2007

AbstractEvidence is presented which shows that both free‐radical and monomer species can be subject to mass transfer resistances in an emulsion polymerisation. The possible causes of these resistances are analysed. In most cases, simple diffusional resistances will not affect the course of an emulsion polymerisation appreciably. However, interfacial resistance to mass transfer which occurs at the water‐particle boundary can have noticeable effects on the polymerisation.The practical consequences of these phenomena are discussed. These can be of particular importance in emulsion copolymerisation.
The coloration of synthetic polymers: A review of the chemistry of dyeing of hydrophobic fibres
Authors: Giles C. H. 
Published: March 2007

AbstractThe dyeing methods of anionic dyes on nylon, cationic dyes on polyacrylonitrile fibres, and non‐ionic (disperse) dyes on nylon, cellulose acetate, polyethylene terephthalate, and polypropylene are surveyed and their chemical mechanism outlined.The mass coloration of plastics, and the state of disperse dyes in the fibre are also briefly discussed. Dyeing of the polar hydrophobic fibres with disperse dyes differs from all other types of dyeing in that the dye—fibre bonding is overwhelmingly hydrogen bonding, and van der Waals or hydrophobic bonding seems to have a negligible influence. All the polar groups and aromatic nuclei in the dye and the fibre can take part in the bonding, and the fibre can act as proton acceptor or donor. Because of these facts disperse dyeing has special features, including: linearity of adsorption isotherms; direct relation between water solubility and fibre solubility of dye and between number of hydrogen‐bonding groups in a dye and its solubility in the fibre; constancy of dye diffusion coefficient in the fibre, and additivity of solubility in the fibre of certain disperse dyes; and the possibility of dry dyeing, either from the vapour phase or from non‐aqueous solvents.The size, shape, and number and nature of polar substituent groups of the disperse dye molecule influence its diffusion coefficient in the fibre.Polypropylene fibre, if unmodified, has no polar or ionic groups and has no affinity for most disperse dyes; a very few however, have sufficient attraction by dispersion forces, to enable them to give weak shades on this fibre.