bluuebunny/crossref_metadata_2025_split huggingface dataset:
Internal broadband diversity dipole antenna
Authors: Su Saou‐Wen , Chou Jui‐Hung , Wu Tzuenn‐Yih 
Published: February 2007

AbstractAn internal printed diversity antenna mounted on a PCMCIA network card for broadband operation is presented. The antenna has a low profile of 6 mm to the network card and a small protruded length of 3 mm. The diversity antenna comprises two back‐to‐back dipoles, and each dipole is further comprised of a longer and a shorter radiating arms. The two radiating arms have complementary shape such as to make the antenna tend to be a self‐complementary structure, thus leading to a wide operating bandwidth of ∼4.6 GHz (approximately 2.9 ∼ 7.5 GHz). © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 810–812, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22287
Swamping of circular Bragg phenomenon and shaping of videopulses
Authors: Geddes Joseph B. , Lakhtakia Akhlesh 
Published: February 2007

AbstractWe studied the durations and average speeds of videopulses transmitted through chiral sculptured thin films using a finite‐difference algorithm. The chiral STF was either linear or possessed an intensity‐dependent permittivity. Videopulse durations tended to decrease with increasing carrier wavelength and to increase, for given carrier wavelength and polarization state, when the chiral STF was nonlinear with intensity‐dependent permittivity. The rate of decrease in durations with wavelength was less than that for longer‐duration pulses. The effect of the circular Bragg phenomenon was swamped by the wide bandwidth possessed by videopulses. Two measures of videopulse average speed did not change much with carrier wavelength, and decreased slightly for a given carrier wavelength and polarization state in the nonlinear case. The other measure of average speed tended to increase with increasing carrier wavelength, and decrease for a given carrier wavelength and polarization state in the nonlinear case. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 776–779, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22290
Design of compact CPW bandpass filters with wide stopband
Authors: Lin Li‐Jing , Ho Min‐Hua , Xu Wei‐Qin 
Published: February 2007

AbstractTwo compact bandpass filters composed of the lumped elements in various coplanar waveguide (CPW) forms have been presented in this study. The filters were designed to operate at the frequency of 2.45 GHz. The behaviors of these filters can be simulated by the equivalent lumped‐element circuit models with each element realized by the corresponding CPW discontinuity. Simulation and measurements were found to be in good agreement. Most attractive of all, the improved‐design filter has achieved about a 363% (9.04 GHz) stopband bandwidth under a 20 dB out‐of‐band rejection, and the measured passband's minimum insertion loss is around −1.24 dB with 10.84% 3‐dB bandwidth. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 973–976, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22299
High‐performance single‐turn interlaced‐stacked transformers for Ka‐band CMOS RFIC applications
Authors: Lin Yo‐Sheng , Chen Chi‐Chen , Liang Hsiao‐Bin , Yeh Po‐Feng , Wang Tao , Lu Shey‐Shi 
Published: February 2007

AbstractIn this article, we demonstrate that high‐coupling and ultra‐low‐loss transformers for Ka‐Band (26–40 GHz) CMOS RFIC applications can be achieved by using single‐turn interlaced‐stacked (STIS) structure implemented in a standard 0.18‐μm CMOS technology. State‐of‐the‐art GAmax of 0.777, 0.852, and 0.799 (i.e., NFmin of 1.097, 0.695, and 0.977 dB) were achieved at 30, 36, and 40 GHz, respectively, for a 2‐layer STIS transformer with an inner dimension of 100 × 100 μm2 and a metal width of 10 μm, mainly due to the high magnetic‐coupling factor and the high resistive‐coupling factor. Furthermore, the reasons why the STIS transformer exhibits better performances than the traditional bifilar and the traditional stacked transformer are explained. These results show that the STIS transformers are very promising for high‐performance Ka‐Band CMOS RFIC applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 936–942, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22301
A hairpin line wideband bandpass filter design with embedded open stubs
Authors: Hung Cheng‐Yuan , Weng Min‐Hang , Su Yan‐Kuin , Yang Ru‐Yuan 
Published: February 2007

AbstractIn this paper, a compact three‐poles hairpin line wideband bandpass filter with several embedded open stubs to improve the stopband is designed and implemented on print circuit board substrate. This filter at center frequency f0 of 4.25 GHz has presented almost very good measured characteristics, including the bandwidth of 3.1–5.4 GHz (3‐dB fractional bandwidth of 54%), low insertion loss of −0.7 ± 0.4 dB, sharp rejection due to two transmission zeros in the passband edge created by interstage coupling, and wide stopband rejection greater than 15 dB from 5.6 to 11 GHz. Experimental results of the fabricated filter show a good agreement with the predict results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 934–936, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22302
Application of the high‐order symplectic FDTD scheme to the curved three‐dimensional perfectly conducting objects
Authors: Sha Wei , Wu Xianliang , Chen Mingsheng , Huang Zhixiang 
Published: February 2007

AbstractA high‐order symplectic finite‐difference time‐domain (SFDTD) scheme using the diagonal split‐cell model is presented to analyze electromagnetic scattering of the curved three‐dimensional perfectly conducting objects. On the one hand, for the undistorted cells, the fourth‐order accurate spatial difference is employed. On the other hand, for the completely distorted cells, the treatment of the curved surfaces is based on the diagonal split‐cell model. Finally, for the partially distorted cells, the interpolation strategy is proposed to keep the field components continuous. The numerical experiments suggest that the diagonal SFDTD scheme can obtain more accurate results than both the staircased SFDTD scheme and the traditional diagonal FDTD method. Furthermore, in view of the high numerical stability, the improved symplectic scheme does not need to decrease time increment to comply with the stability criterion. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 931–934, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22306
Wavelet‐Galerkin of time domain method to analyze the scattering problems of randomly rough surface
Authors: Dai Shao‐yu , Wu Zhen‐sen 
Published: February 2007

AbstractA Monte‐Carlo Wavelet‐Galerkin of Time Domain technique is presented for wave scattering from randomly rough, one‐dimensional PEC surface, and a numerical interface is applied to overcome the complexity of connection and absorption boundaries. The bistatic RCS for the surface with Gaussian surface roughness spectra are obtained using this technique. Results are in good agreement with MoM. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 928–931, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22307
Single‐feed square‐ring patch antenna with dual‐frequency operation
Authors: Chen Shing‐Hau , Row Jeen‐Sheen , Sim Chow‐Yen‐Desmond 
Published: February 2007

AbstractThe paper presents the design of a dual‐frequency patch antenna with different radiation patterns. The antenna structure is composed of a square‐ring patch and two shorting walls. Two resonant modes, patch‐loaded monopole mode and normal patch mode, can be simultaneously excited in the antenna structure by a coupling strip inide the square‐ring patch. Therefore, the antenna can radiate monopole‐like and broadside patterns at two operating frequencies, respectively. Several prototypes of the proposed dual‐frequency patch antenna with the frequency ratios ranging from 1.18 to 1.73 are constructed, and the obtained experimental results are also shown. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 991–994, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22308
TM and TE frequencies of the lens waveguide
Authors: Wang C. Y. 
Published: February 2007

AbstractThe electromagnetic frequencies (both TM and TE) are determined for the simple lens waveguide, which is bounded by two symmetric circular arcs. The Ritz method is shown to be efficient and accurate. It is found that the 5:1 aspect ratio separates the modes better than the 2:1 aspect ratio. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 918–920, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22317
An UWB planar out‐of‐phase power divider employing parallel stripline‐microstrip transitions
Authors: Abbosh A. M. , Bialkowski M. E. 
Published: February 2007

AbstractThe design of a planar out‐of‐phase (180°) power divider with an ultra wideband performance is presented. The device employs two dielectric substrates with a common ground plane. A transition from a parallel stripline to two microstrip lines is formed to divide power equally and with 180° phase difference from a stripline input port to two microstrip line output ports. The simulated and measured results of the proposed divider show equal power division with high stability of phase, good return loss at the three ports, low insertion losses, and fine isolation between the two output ports across the band from 3 to more than 11 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 912–914, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22324
Simple design for cost‐effective diversity antennas
Authors: Belmar‐Moliner N. , Valero‐Nogueira A. , Cabedo‐Fabrés M. , Antonino‐Daviu E. 
Published: February 2007

AbstractThis letter shows a simple design for a diversity planar monopole antenna with two feed points that can be used in multiple input multiple output (MIMO) systems. The design is based on the theory of characteristic modes. The final antenna has two highly isolated ports with an envelope correlation of less than 0.02 at the central frequency. This fact shows that the antenna meets the requirement for achieving diversity, and therefore, capacity. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 994–996, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22325
Spectroscopic characterization of 6‐hydroxy and 1‐methyl‐6‐hydroxybicyclo[2.2.2]octan‐2‐one ethylene acetals and ethylene dithioacetals
Authors: Leonelli Francesca , Garofalo Barbara , La Bella Angela , Lasta Ermanno , Ceccacci Francesca , Migneco Luisa M. , Marini Bettolo Rinaldo 
Published: February 2007

Abstract6‐endo‐ and 6‐exo‐Hydroxybicyclo[2.2.2]octan‐2‐one and 1‐methyl‐6‐endo‐ and 6‐exo‐hydroxybicyclo[2.2.2]octan‐2‐one ethylene acetals and ethylene dithioacetals 1–4 have been characterized by 1D and 2D NMR methods. Copyright © 2007 John Wiley & Sons, Ltd.
Language phenotypes and intervention planning: Bridging research and practice
Authors: Fidler Deborah J. , Philofsky Amy , Hepburn Susan L. 
Published: February 2007

AbstractThis paper focuses on the communication and language phenotypes associated with three genetic disorders: Down syndrome, Williams syndrome, and fragile X syndrome. It is argued that there is empirical evidence that these disorders predispose children to specific profiles of strength and weakness in some areas of speech, language, and communication, and that intervention planning for children with each syndrome may take an approach informed by these profiles. Issues related to within‐group variability, shared outcomes among syndromes, and the need for empirical validation for syndrome‐specific recommendations are discussed. © 2007 Wiley‐Liss, Inc. MRDD Research Reviews 2007; 13:47–57.
The state of research and practice in augmentative and alternative communication for children with developmental/intellectual disabilities
Authors: Wilkinson Krista M. , Hennig Shannon 
Published: February 2007

AbstractAugmentative and alternative communication is a compilation of methods and technology designed to supplement spoken communication for people with limited speech or language skills, including children with developmental and intellectual disabilities. The field of AAC has evolved rapidly within the last 10 years, due to a combination of empirical advances from research as well as rapid changes in technology. This article reviews some of the most significant aspects of this growth as it relates to children with developmental disabilities. Major issues within the field, the evidence base available to practitioners and researchers, and promising areas of future growth are identified. © 2007 Wiley‐Liss, Inc. MRDD Research Reviews 2007;13:58–69.
Early communication development and intervention for children with autism
Authors: Landa Rebecca 
Published: February 2007

AbstractAutism is a neurodevelopmental disorder defined by impairments in social and communication development, accompanied by stereotyped patterns of behavior and interest. The focus of this paper is on the early development of communication in autism, and early intervention for impairments in communication associated with this disorder. An overview of components of communication is provided. Communication characteristics that are diagnostic of autism are summarized, with consideration of the overlap between social and communication impairment, particularly for children with autism functioning at the prelinguistic level. Early communication development and predictors of communication functioning in autism are examined, based on a review of prospective and retrospective studies. The focus of the discussion then turns to intervention. Consideration is given to the rationale for beginning intervention as early in life as possible for children with autism. Implications of motor, imitation, and play deficits for communication‐based intervention are examined. Finally, issues related to the design and delivery of intervention for young children with autism are presented, along with a review of the major early intervention approaches for autism. © 2007 Wiley‐Liss, Inc. MRDD Research Reviews 2007;13:16–25.
Dynamically shimmed multivoxel 1H magnetic resonance spectroscopy and multislice magnetic resonance spectroscopic imaging of the human brain
Authors: Koch Kevin M. , Sacolick Laura I. , Nixon Terence W. , McIntyre Scott , Rothman Douglas L. , de Graaf Robin A. 
Published: February 2007

AbstractIn vivo multivoxel Magnetic Resonance Spectroscopy (MRS) and multislice Magnetic Resonance Spectroscopic Imaging (MRSI) are extremely susceptible to poor homogeneity of the static magnetic field. Existing room‐temperature (RT) shim technology can adequately optimize the B0 homogeneity of local volumes, such as single voxels. However, the widespread global homogeneity required for in vivo spectral acquisitions from multiple volumes in the human brain cannot be attained with a single RT shim setting. Dynamic shim updating (DSU) allows for use of local RT shim B0 homogeneity compensation capabilities in a global fashion. Here, by updating first‐ and second‐order shims on a voxel‐ and slice‐specific basis using a pre‐emphasized DSU system, we present multivoxel MRS and multislice MRSI of the human brain. These results demonstrate that DSU can increase multivoxel MRS acquisition capabilities and significantly improve the quality of multislice MRSI data. Magn Reson Med 57:587–591, 2007. © 2007 Wiley‐Liss, Inc.
Sources of phase changes in BOLD and CBV‐weighted fMRI
Authors: Zhao Fuqiang , Jin Tao , Wang Ping , Hu Xiaoping , Kim Seong‐Gi 
Published: February 2007

AbstractPhase changes in blood oxygenation‐level dependent (BOLD) fMRI have been observed in humans; however, their exact origin has not yet been fully elucidated. To investigate this issue, we acquired gradient‐echo (GE) BOLD and cerebral blood volume (CBV)‐weighted fMRI data in anesthetized cats during visual stimulation at 4.7T and 9.4T, before and after injection of a superparamagnetic contrast agent (monocrystalline iron oxide nanoparticles, MION), respectively. In BOLD fMRI, large positive changes in both magnitude and phase were observed predominantly in the cortical surface area, where the large draining veins reside. In CBV‐weighted fMRI, large negative changes in both magnitude and phase were detected mainly in the middle cortical area, where the greatest CBV change takes place. Additionally, the phase change was temporally correlated with the magnitude response and was linearly dependent on the echo time (TE), which cannot be explained by the intravascular (IV) contribution and functional temperature change. Phase changes with the opposite polarity were also observed in the regions around the dominant phase changes. These phase changes can be explained by the application of the “Lorentz sphere” theory in the presence of relevant activation‐induced changes in vessels. The volume‐averaged magnetization and its demagnetization are the main sources of fMRI signal phase change. Magn Reson Med 57:520–527, 2007. © 2007 Wiley‐Liss, Inc.
Serial MRI of carotid plaque burden: Influence of subject repositioning on measurement precision
Authors: Balu Niranjan , Kerwin William S. , Chu Baocheng , Liu Fei , Yuan Chun 
Published: February 2007

AbstractMRI has the potential to track changes in the size of carotid atherosclerotic plaques for patient monitoring or in clinical trials. For either application, highly reproducible serial measurements are critical for drawing accurate conclusions. This study investigates the role of inconsistent repositioning of the artery from scan to scan in overall measurement variability. The total variability of cross‐sectional area measurements is modeled as a combination of variability due to segmentation differences, changes in orientation of the artery, and longitudinal offsets of the image location. Model parameters were generated using measurements from carotid arteries imaged in vivo. Comparison with actual reproducibility measurements for the lumen and outer wall boundaries showed that the errors were accurately predicted by the model, including a strong correlation between lumen and wall measurement differences. Orientation variability was the single most important factor that affected reproducibility, which suggests that methods are needed to obtain consistent orientation of the artery relative to the image plane. Magn Reson Med 57:592–599, 2007. © 2007 Wiley‐Liss, Inc.
Hyperpolarized 13C MRI of the pulmonary vasculature and parenchyma
Authors: Ishii Masaru , Emami Kiarash , Kadlecek Stephen , Petersson J. Stefan , Golman Klaes , Vahdat Vahid , Yu Jiangsheng , Cadman Robert V. , MacDuffie‐Woodburn John , Stephen Michael , Lipson David A. , Rizi Rahim R. 
Published: February 2007

AbstractThe study of lung perfusion in normal and diseased subjects is of great interest to physiologists and physicians. In this work we demonstrate the application of a liquid‐phase hyperpolarized (HP) carbon‐13 (13C) tracer to magnetic resonance imaging (MRI) of the pulmonary vasculature and pulmonary perfusion in a porcine model. Our results show that high spatial and temporal resolution images of pulmonary perfusion can be obtained with this contrast technique. Traditionally, pulmonary perfusion measurement techniques have been challenging because of insufficient signal for quantitative functional assessments. The use of polarized 13C in MRI overcomes this limitation and may lead to a viable clinical method for studying the pulmonary vasculature and perfusion. Magn Reson Med 57:459–463, 2007. © 2007 Wiley‐Liss, Inc.
Multispectral tissue characterization in a RIF‐1 tumor model: Monitoring the ADC and T2 responses to single‐dose radiotherapy. Part II
Authors: Henning Erica C. , Azuma Chieko , Sotak Christopher H. , Helmer Karl G. 
Published: February 2007

AbstractA multispectral (MS) approach that combines apparent diffusion coefficient (ADC) and T2 parameter maps with k‐means (KM) clustering was employed to distinguish multiple compartments within viable tumor tissue (V1 and V2) and necrosis (N1 and N2) following single‐dose (1000 cGy) radiotherapy in a radiation‐induced fibrosarcoma (RIF‐1) tumor model. The contributions of cell kill and tumor growth kinetics to the radiotherapy‐induced response were investigated. A larger pretreatment V1 volume was correlated with decreased tumor growth delay (TGD) (r = 0.68) and cell kill (r = 0.71). There was no correlation for the pretreatment V2 volume. These results suggest that V1 tissue is well oxygenated and radiosensitive, whereas V2 tissue is hypoxic and therefore radioresistant. The relationship between an early ADC response and vasogenic edema and formation of necrosis was investigated. A trend for increased ADC was observed prior to an increase in the necrotic fraction (NF). Because there were no changes in T2, these observations suggest that the early increase in ADC is more likely based on a slight reduction in cell density, rather than radiation‐induced vasogenic edema. Quantitative assessments of individual tissue regions, tumor growth kinetics, and cell kill should provide a more accurate means of monitoring therapy in preclinical animal models because such assessments can minimize the issue of intertumor variability. Magn Reson Med 57:513–519, 2007. © 2007 Wiley‐Liss, Inc.
Aromatic poly(sulfone sulfide amide imide)s as new types of soluble thermally stable polymers
Authors: Mehdipour‐Ataei Shahram , Hatami Mehdi 
Published: February 2007

AbstractA new diamine monomer containing flexible sulfone, sulfide, and amide units was prepared via three steps. Nucleophilic chloro displacement reaction of 4‐aminothiophenol with 4‐nitrobenzoyl chloride in the presence of propylene oxide afforded N‐(4‐mercapto‐phenyl)‐4‐nitrobenzamide and subsequent reduction of the nitro intermediate led to 4‐amino‐N‐(4‐mercapto‐phenyl)benzamide. Two moles of this amino thiophenol compound was reacted with bis‐(4‐chloro phenyl)sulfone to provide a novel diamine monomer. The diamine was reacted with aromatic dianhydrides to form polyimides via a two‐step polycondensation method, formation of poly(amic acid)s, followed by chemical imidization. The resulting polymers were characterized and their physical properties including thermal behavior, thermal stability, solubility and inherent viscosity were studied. Copyright © 2007 John Wiley & Sons, Ltd.
Thermochromic cellulose fibers
Authors: Rubacha Marcin 
Published: February 2007

AbstractA method of obtaining thermochrome cellulose fibers has been developed. The basis technology used to form fibers was the Lyocell process. This method is based on spinning fibers from concentrated solvents of cellulose, using dry‐wet method in aqueous solidification bath. The cellulose solvent used in this process was N‐oxide‐N‐methylomorpholine (NMMO). The studies were to check on the features of the fibers obtained from solvents with thermochrome pigmentation, in order to evaluate their practical use. Thermochrome modifier used in the experiment was Chromicolor®AQ‐INK, Magenta type#27 pigmentation. This modifier was introduced into the spinning solutions in such amounts that fibers obtained from them would contain 1–10 wt% of pigmentation. Fibers formed out of modified solvents underwent spectral values, thermal, physicomechanical analyses, also their sorption features were evaluated. Copyright © 2007 John Wiley & Sons, Ltd.