bluuebunny/crossref_metadata_2025_split huggingface dataset:
Limb replantation with two robots: A feasibility study in a pig model
Authors: Taleb Chihab , Nectoux Eric , Liverneaux Philippe 
Published: February 2009

AbstractThe aim of this study is to assess the feasibility of limb replantations and transplantations by telesurgery. The material consisted in a large white pig and two surgical robots (DaVinciS® telemanipulators). The procedure consisted in a trans‐humeral cross‐section of the left thoracic limb, which was secondarily replanted. Results showed good vascular permeability, while the operator's physiological tremor was suppressed. Our results seem to demonstrate that telesurgery could improve limb replantation and transplantation management, especially regarding operating gesture precision. © 2009 Wiley‐Liss, Inc. Microsurgery, 2009.
A novel rabbit model for the evaluation of retrograde flow venous flaps
Authors: Tan Maybelle P. S. , Lim Aymeric Y.T. , Zhu Qifen 
Published: February 2009

AbstractVenous flaps have several potential advantages over traditional flaps, but their uses have been limited by unpredictable survival. Although clinical and experimental studies have concentrated mainly on the antegrade arterialization of venous flaps to increase survival, retrogradely arterialized venous flaps (AVFs) may have the greatest potential. There is, however, little literature on their use. There are also no animal studies comparing their survival to other venous flaps used in a similar situation. Our aim was to design a flap utilizing the rabbit's valved, thoracoepigastric vein (consisting of the lateral thoracic and epigastric veins) as the source vessel for the study of retrograde arterialized venous flaps (RAVFs). A pilot study (n = 10) to determine the survival of RAVFs was performed utilizing this animal model. Four flaps had complete survival at the end of our 2‐week observational period. However, we also had four partial flap losses and two cases in which the entire flap was lost. An average survival area of 44.5% was observed. In conclusion, our designed rabbit thoracoepigastric RAVF is simple to apply and easily reproducible. It is the first animal flap adapted specifically for the study of RAVFs, and may be used for the further investigation of these flaps, which have shown unpredictable survival to date. © 2009 Wiley‐Liss, Inc. Microsurgery, 2009.
Design of compact bandpass cavity combline filter for satellite positioning receiver systems
Authors: Weiwei Wu , Qi Feng , Jinjian Huang , Naichang Yuan 
Published: February 2009

AbstractIn this article, the size of the cavity combline filter is greatly reduced by using capacitively loaded disks and reentrant combline resonators. It has low loss, high Q quality factor and wide stopband. The feasibility of this method is analyzed theoretically. The characteristics of the structure are studied by simulations. The size of the fabricated filter is almost 50% of the size of the conventional cavity combline filter. The measured S parameters of the two filters are given. At 1575 MHz, which is the operating frequency of the global positioning system receiver antijamming antenna array system, the inserted loss of the improved filter is 0.702 dB. To minimize the interference from the Bei‐Dou double star positioning system, at 1615 MHz, which is the operating frequency of this system, the out‐of‐band rejection of the improved filter at this frequency is 27.010 dB. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 910–913, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24191
Generalized fast, slow, stop, and store light optically within a nanoring resonator
Authors: Pornsuwancharoen N. , Yupapin P. P. 
Published: February 2009

AbstractWe propose a remarkably simple system of an all optical system that can be used to fast, slow, stop, and store light coherently. The proposed system consist two micro and a nanoring resonators that can be integrated into a single system, which can be used to overcome the problem of bandwidth delay constraints with small group velocities. The large bandwidth is generated by a soliton pulse within a Kerr type nonlinear medium where an all optical adiabatic and reversible pulse bandwidth compression can be performed. The balance between dispersion and nonlinear lengths of the soliton pulse exhibits the soliton behavior known as self‐phase modulation, which introduces the optical output (i.e., gain) constant, which means that light pulse can be trapped, that is, stopped coherently within the nanowaveguide. The time independent optical gain is stored within the nanoring device, which is available for read only memory use. The memory time of 1 ps is achieved. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 899–902, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24194
Metamaterial slabs and realization of all‐type filter characteristics: Numerical and analytical investigations
Authors: Çimen Sibel , Çakir Gonca , Sevgi Levent 
Published: February 2009

AbstractStudies towards understanding and the use of metamaterials (MTM) have risen in electromagnetic engineering. This article presents analytical and numerical investigations of filter characteristics of MTMs in two‐dimension (2D). Numerical investigations are based on finite difference time domain (FDTD) simulations, analytical formulations belong to a plane wave excitation of multi‐slab structures. It is shown that a three layer structure with different combinations of MTMs and non‐MTMs may be used to realize all four types of filter characteristics. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 894–899, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24196
Dual‐band feedforward linear power amplifier for digital cellular and IMT‐2000 base‐station
Authors: Choi Heungjae , Jeong Yongchae , Kenney J. S. , Kim Chul Dong 
Published: February 2009

AbstractThis article presents the design of a novel dual‐band signal cancellation circuit and its application to feedforward linear power amplifier. Intermodulation distortion cancellation loop shows 20.45 dB and 25.04 dB suppression for digital cellular band and IMT‐2000 band, respectively, over a correction bandwidth of 100 MHz. From the adjacent channel leakage ratio measurement, 16.5 dB and 18.6 dB improvements are achieved for each band under simultaneous operation. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 922–926, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24198
A 60‐GHz low‐noise amplifier for 60‐GHz dual‐conversion receiver
Authors: Lin Yo‐Sheng , Wong Simon S. 
Published: February 2009

AbstractA 60‐GHz‐band low‐noise amplifier (LNA) using bulk 65‐nm CMOS technology is reported. To achieve sufficient gain, this LNA is composed of three cascade common‐source stages followed by a cascode output stage. Current‐sharing technique is adopted in the second and third stage to reduce power dissipation. The output of each stage is loaded with an LC parallel resonance circuit to maximize the gain over the 57–64‐GHz‐band of interest. This LNA achieved input return loss (S11) of −10.6 to −37.4 dB, voltage gain (AV) of 10.7–18.8 dB, reverse isolation (S12) of −43.5 to −48.1 dB, input referred 1‐dB compression point (P1dB‐in) of −16.2 to −20.8 dBm, and input third‐order intermodulation point (IIP3) of −4 to −7.5 dBm over the 57–64‐GHz‐band of interest. It consumed only a small DC power of 21.4 mW. In addition, the chip area was only 0.849 × 0.56 mm2, including all the test pads and bypass capacitors. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 885–891, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24200
Mobile radio propagation along mixed paths in forest environment using parabolic equation
Authors: de Souza João F. , Magno Fátima N. B. , Valente Zínia A. , Costa Jessé C. , Cavalcante Gervásio P. S. 
Published: February 2009

AbstractThe propagation loss in mixed‐path mobile communication was calculated using parabolic equation (PE) method. The implicit finite differences scheme of the Crank–Nicolson method was applied to solve the PE. The results were compared with obtained measurements campaigns carried out in typical Amazonian cities and then compared with methods found in literature. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1133–1136, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24212
Novel factor of merit for center‐frequency tunable bandpass filters comparison
Authors: Pistono Emmanuel , Kaddour Darine , Duvillaret Lionel , Duchamp Jean‐Marc , Vilcot Anne , Ferrari Philippe 
Published: February 2009

AbstractThis article presents an improved factor of merit for the comparison of center‐frequency tunable bandpass filters. This study draws up a comparison between existing tunable filters for which different commonly used parameters demonstrating their performance are given. A first factor of merit that takes all the major characteristics of such tunable filters into account is introduced. A second factor of merit is proposed to evaluate the filter compactness. These new factors of merit are applied for the comparison of more than 30 recently published papers. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 985–988, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24220
Compact microstrip harmonic‐suppressed quadrature hybrids
Authors: Wang Li‐Yen , Hsu Kewen , Tu Wen‐Hua 
Published: February 2009

AbstractIn this article, compact 3‐dB branch‐line hybrids with harmonic suppression are presented. In comparison to the conventional hybrids, the proposed ones achieve two features: compactness and harmonic suppression. Two hybrids, one with third harmonic suppression and the other with third and fifth harmonics suppression, are designed, fabricated, and measured. T‐shaped or cross‐shaped equivalent lines are used to replace the quarter‐wavelength microstrip lines of the conventional hybrids. The equivalent lines achieve the same fundamental characteristic and act like bandstop filters at the particular harmonics to improve suppression. Moreover, the proposed hybrid with third harmonic suppression achieves 29.5% size reduction as compared to the conventional one. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 981–985, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24221
Performance analysis of a printed super‐wideband antenna
Authors: Dong Yuandan , Hong Wei , Liu Leilei , Zhang Yan , Kuai Zhenqi 
Published: February 2009

AbstractPerformance in both frequency‐domain and time‐domain for a printed super‐wideband antenna is studied and presented in this article. The proposed antenna consists of a corner‐rounded ground plane, a tapered microstrip feeder and a novel radiating patch which is made by one half‐disc and one half‐ellipse. This configuration allows to implement a ratio impedance bandwidth more than 25:1 for voltage standing wave ratio (VSWR) < 2. Critical antenna characteristics including antenna transfer function, group delay and time‐domain pulse responses are experimentally investigated and analyzed in detail by setting up a transceiving antenna system, which give designers a thorough understanding and useful information about antenna performance and application it exhibits behind the extremely broad bandwidth. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 949–956, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24222
Ultra wideband pulse generation using microstrip coupled lines
Authors: Tekin Ibrahim 
Published: February 2009

AbstractIn this article, a novel ultra wideband (UWB) pulse generator using microstrip coupled lines (MCL) is described. The MCL circuit generates an UWB pulse which can used both in UWB communication transmitter and receiver circuits as well as ground penetrating and wall through radars. The proposed circuit formed by microstrip coupled lines and terminations generates an UWB pulse from one of the output of the microstrip couple lines. Different bandwidth pulses from the circuit can be obtained by adjusting the length of the microstrip lines. An example circuit is implemented on an FR4 substrate with dielectric constant of εr = 4.6. The length of the microstrip line was set to 9.3 cm, and pulse duration of 235 ps is obtained. This corresponds to a Gaussian pulse with 4.3 GHz bandwidth at the center frequency of 2.15 GHz. Time and frequency measurements results are presented for time waveform and |S21| of the circuit, respectively. The circuit is low cost and can be easily implemented for UWB applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 944–949, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24223
Chip‐inductor‐embedded small‐size printed strip monopole for WWAN operation in the mobile phone
Authors: Kang Ting‐Wei , Wong Kin‐Lu 
Published: February 2009

AbstractA simple small‐size printed strip monopole embedded with a chip inductor for covering all the five operating bands of GSM850/900/1800/1900/UMTS for wireless wide area network (WWAN) operation in the mobile phone is presented. The antenna consists of a chip‐inductor‐embedded longer radiating strip and a shorter radiating strip. With a 10‐nH chip inductor embedded, the longer radiating strip has a length of about 46 mm only (about 0.14 wavelength at 900 MHz), yet supports a wide resonant mode at about 900 MHz for the antenna's lower band to cover GSM850/900 operation. The shorter radiating strip has a length of about 30 mm (about 0.2 wavelength at 2000 MHz) and provides a wide resonant mode at about 2000 MHz for the antenna's upper band to cover GSM1800/1900/UMTS operation. With the five operating bands covered, the two radiating strips occupy a small printed area of about 350 mm2 on the system circuit board of the mobile phone. Details of the proposed antenna are described, and the specific absorption rate results of the antenna are also analyzed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 966–971, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24225
Design of dual‐band SIR bandpass filter with a broad upper rejection band for WLANs
Authors: Chang Yu‐Chi , Kao Chia‐Hsiung , Weng Min‐Hang 
Published: February 2009

AbstractIn this letter, we proposed the design of novel dual‐band bandpass filter (BPF) with a broad upper rejection band using only two asymmetric stepped impedance resonators (SIRs), which has a smaller circuit size in comparison of previous works. The feature of the asymmetric SIR is only one‐step discontinuity, which is different from the conventional SIR with two‐step discontinuities. By selecting properly the impedance ratio (R) and physical length ratio (α) of the proposed asymmetric SIRs, the low loss dual‐band BPF centered at 2.4/5.2 GHz with a wide upper rejection band from 6 to 14 GHz can be implemented perfectly. The bandwidths and the coupling coefficients of the two passbands can be tunable by adjusting the coupling gap distance between the resonators, which are calculated by using full‐wave simulator IE3D. Good agreement between the electromagnetic (EM) simulation and measurement is reported. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1143–1146, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24227
A low local oscillator power K‐band mixer based on tunneling diodes
Authors: Magrini Iacopo , Cidronali Alessandro , Manes Gianfranco 
Published: February 2009

AbstractIn this article, we will demonstrate a low local oscillator (LO) power K‐band mixer based on a tunneling diode technology. Due to its unique diode characteristics, no DC supply is needed, whereas an LO power as low as −2 dBm is required for nominal functionality. The energy‐efficient MMIC prototype integrates a pair of heterojunction interband tunnel diodes and a 90° coplanar broadband coupler. The prototype is optimized within the 19–26 GHz band, with an IF ranging from zero to 7 GHz. In addition, when compared with other mixers, it has the lowest LO power requirement with a conversion loss ranging from 6 to 10 dB, an input compression point of −3 dBm and an intercept 2nd and 3rd order intermodulation point of 22 and 12 dBm, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1140–1143, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24228
Millimeter‐wave transition of coplanar line to substrate‐integrated LiNbO3 waveguide for traveling‐wave electro‐optical modulator
Authors: Mortazy Ebrahim , Xu Feng , Meunier Michel , Wu Ke 
Published: February 2009

AbstractIn this article, a transition of coplanar line to substrate‐integrated waveguide onto electro‐optical LiNbO3 substrate for the design of traveling‐wave optical phase modulator at 60 GHz were proposed, designed, and fabricated for the first time. Micromachining of the LiNbO3 substrate, which is transparent to a wide range of laser wavelengths, was done by using Excimer laser. Metallized via holes around the coplanar line are considered for the purpose of mode suppression. Also, a cavity resonator was designed to increase the circuit bandwidth. Measurement results show about 5 GHz bandwidth for the demonstrated substrate‐integrated electro‐optical waveguide. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1105–1107, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24229
A low‐power low‐phase‐noise 48‐GHz CMOS LC VCO for 60‐GHz dual‐conversion receiver
Authors: Chang Tien‐Hung , Chen Chang‐Zhi , Lin Yo‐Sheng , Huang Guo‐Wei 
Published: February 2009

AbstractIn this article, a low‐power low‐phase‐noise 48‐GHz CMOS LC voltage‐control oscillator (VCO) using standard 0.13‐μm CMOS technology is reported. Low‐power consumption is achieved by maximizing the equivalent parallel resistance of the LC tank, while low‐phase‐noise is achieved by suppressing the up‐conversion of the flicker noise of the PMOS current source to 1/f3‐shaped phase noise close to the carrier. The VCO dissipated 5.556 mW power, and achieved state‐of‐the‐art phase noise of −105 dBc/Hz at 1‐MHz offset from 47.85 GHz. The corresponding figure‐of‐merit (FOM) was −191.1 dBc/Hz, which is better than those of the reported CMOS LC VCOs around 48 GHz in the literature. The chip area was 0.94 × 0.9 mm2including the test pads. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 997–1000, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24256
Design of a microstip fed step slot antenna for UWB communication
Authors: Gopikrishna M. , Krishna Deepti Das , Aanandan C. K. , Mohanan P. , Vasudevan K. 
Published: February 2009

AbstractThe design and performance of a stepped slot printed monopole antenna in the ultrawideband is presented in this article. Multiple resonances generated by the stepped slot geometry are matched in the ultrawideband using a modified microstrip feed. The impedance bandwidth (SWR < 2) of the antenna is from 3 to 11 GHz. Radiation patterns are stable and omnidirectional with appreciable gain throughout the band. Performance of the antenna is also analyzed in the time domain, which reveals good pulse handling capabilities. Compact geometry of the antenna allows easy commercial deployment. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1126–1129, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24262
Mono‐ and difluorinated 1,1,2,2,9,9,10,10‐octafluoro[2.2]paracyclophanes (AF4s)—A 1H and 19F NMR study
Authors: Ghiviriga Ion , Dulong Florian , Dolbier William R. 
Published: February 2009

AbstractComplete assignment of the 1H and 19F chemical shifts in 4‐fluoro‐AF4 (1) were based on the nOes seen in its 19F‐1H HOESY spectrum. This allowed for identification of features which can further be applied to the assignment of the regiochemistry of substituted perfluoroparacyclophanes (PCPs) and AF4s: (i) an aromatic fluorine couples with the two fluorines in the closest bridge that are syn to it, with constants of ca. 20 Hz; (ii) an aromatic fluorine couples with the bridge fluorine five bonds away that is anti to it in the same paraphenylene moiety, with a constant of ca. 3.5 Hz; (iii) the geminal coupling of the bridge fluorines is 246 Hz if they have an ortho fluorine and 238 Hz if they do not; (iv) a bridge fluorine couples with those aromatic protons in the same paraphenylene moiety that are four or five bonds away and anti. These features have been used to assign the regiochemistry of the pseudo‐ortho, pseudo‐meta and pseudo‐para‐difluoro AF4s 2–4. It has also been demonstrated that SCS for the bridge fluorines can be used as well for this assignment. Copyright © 2009 John Wiley & Sons, Ltd.
High‐field head radiofrequency volume coils using transverse electromagnetic (TEM) and phased array technologies
Authors: Avdievich Nikolai I. , Hetherington Hoby P. 
Published: February 2009

AbstractThis article describes technological advances in quadrature transverse electromagnetic (TEM) volume coils and phased arrays reported recently from our laboratory developed for MRI and MRS imaging of the human brain. The first part of this work presents a new method for tuning TEM volume coils based on measurements of the radiofrequency current distribution in the coil elements. This technique facilitates bench adjustment of the coils' homogeneity and is particularly important for tuning double‐tuned TEM volume coils. We have also used this method to optimize other TEM configurations such as a quadrature TEM half‐volume coil and a split TEM coil. TEM half‐volume coils provide greater sensitivity over localized regions than conventional full‐volume coils, and the split TEM coil provides greater patient access and ease of use. The second part of this work describes the development of single‐tuned and double‐tuned transmit TEM volume coils in combination with phased arrays. A variety of different techniques for active detuning of single‐tuned and double‐tuned TEM volume coils are presented along with the development of phased arrays and transmission line preamplifier decoupling. The final section describes the use of counter rotating current (CRC) surface coils in phased arrays. Because of the intrinsic isolation of CRC coils from transmit volume coils, CRC arrays can be used simultaneously with volume coils for both reception and transmission. Near the center of the human head where both the phased array and the volume coil produce similar sensitivities, simultaneous reception enhances the signal‐to‐noise ratio. Conversely, simultaneous transmission can be used to boost the transmit field in peripheral brain regions from the volume coil to provide a more homogeneous transmit field. Copyright © 2009 John Wiley & Sons, Ltd.
Preconditioners for ill‐posed Toeplitz matrices with differentiable generating functions
Authors: Estatico C. 
Published: February 2009

AbstractBoth theoretical analysis and numerical experiments in the literature have shown that the Tyrtyshnikov circulant superoptimal preconditioner for Toeplitz systems can speed up the convergence of iterative methods without amplifying the noise of the data. Here we study a family of Tyrtyshnikov‐based preconditioners for discrete ill‐posed Toeplitz systems with differentiable generating functions. In particular, we show that the distribution of the eigenvalues of these preconditioners has good regularization features, since the smallest eigenvalues stay well separated from zero. Some numerical results confirm the regularization effectiveness of this family of preconditioners. Copyright © 2009 John Wiley & Sons, Ltd.