bluuebunny/crossref_metadata_2025_split huggingface dataset:
Active‐inductor‐matched 6‐GHZ duplexer‐less LNA/PA design incorporated with a bondwire‐antenna
Authors: Ahmed Abdulhakim 
Published: February 2011

AbstractThis article presents a correction to a previously published duplexer‐less LNA/PA circuit incorporating a bondwire antenna showing the comparison between the calculated, simulated, and measured results of the gain, radiated power, radiation pattern, and the transmitter to receiver link‐budget for a bondwire‐antenna for short‐range radio communications in the 6‐GHz frequency range.The correction is given in the radiation efficiency and power transmitted by the PA. The LNA and PA were matched to the 50‐Ω ports of the measuring instruments via an active inductor. Besides the inductive bondwire antenna, the LNA and PA are designed to be completely inductor‐less, thus, saving the silicon chip area. The transceiver range is calculated to be about 4.72 m, ideal for applications such as remote controls, biomedical monitoring equipment, or RFID tags. Both front end blocks are designed with low‐power, low cost, and high yield considerations for production in industry. The inductorless LNA parameters at 6 GHz are S21 of 14 dB for both the LNA and PA, a deduced NF of 4.9 dB for the LNA, S11 and S22 less than −10 dB, with 10‐mW TX, and 15‐mW RX power consumption for a 1.2 V supply. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:761–766, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25823
A multifunctional all‐fiber device with a magnetic nanoparticles core mode blocker for wavelength bandpass filtering and multi‐to‐single mode conversion
Authors: Zhu Yong , Li Xiaoqin , Mei Hao , Wang Chao , Zhu Tao 
Published: February 2011

AbstractA multifunctional all‐fiber device that can simultaneously serve as a multimode‐to‐single mode converter and a wavelength filter is presented in this article. The device has a concatenated structure consisting of a multimode fiber, a hollow core fiber, a single‐mode core mode blocker (made of magnetic nanoparticles), and a long period fiber grating fabricated in a single mode fiber. A quantitative theoretical analysis and experiments are carried out. A device with an extinction ratio of 25.7 dB and an insertion loss of −6.8 dB is obtained, and its performance should be able to be further improved by optimizing the fabrication process in future. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:740–744, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25834
Measurements of the thermally induced phase‐retardation changes in an optical polarization‐sensitive instrument
Authors: Twu Ruey‐Ching , Hong Hao‐Yang 
Published: February 2011

AbstractThe thermally induced phase‐retardation changes between two orthogonal polarizations of a propagating light while passing through some optical components have been investigated in an optical polarization‐sensitive instrument. The measurements were performed in a dual‐channel common‐path polarization interferometer based on optical homodyne method. We study temperature dependent phase‐retardation variations when the lights pass through a heated quarter‐wave plate at different azimuth angles. By the way, we also successfully measure the path dependent phase‐retardation changes when the lights pass through the different kinds of beam splitters under the same thermal impacts. These results show that the variations of ambient temperature will easily cause the systematical measurement errors in the optical polarization‐sensitive instrument. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:771–773, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25838
A novel microstrip‐fed dual band‐notched ultrawideband antenna with a defected ground structure
Authors: Yan Yadong , Zhou Xilang , Wu Linsheng , Yin Wenyan 
Published: February 2011

AbstractA novel microstrip‐fed ultrawideband antenna with dual band‐notched performance is proposed and fabricated. A pair of L‐shaped slots is etched in the ground plane to obtain the notched function in the 3.3–4 GHz WiMAX band. An eccentric ring and a stub with an arc structure are designed for rejecting the 5–6 GHz WLAN band. The obtained results show that the designed antenna satisfies the voltage standing wave ratio requirement of less than 2.5 at the frequency range from 3 to 32 GHz, except the dual notched bands of 3.3–4 and 5–6 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:704–706, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25840
Noise sensor based on a fiber Bragg grating and a Piezo‐electric transducer
Authors: Cheng Chin‐Hsing , Lai Lung‐Hui , Liu Wen‐Fung 
Published: February 2011

AbstractThis article demonstrates an optical fiber sensor using fiber Bragg grating (FBG) and a Piezo‐electrical transducer (PZT) to measure noise.Mounting an FBG on a PZT bar, a dynamic strain simulator was constructed. The voltage produced by noise level applied on PZT was converted to the dynamic variation of FBG Bragg wavelength. The experiments showed that the sensitivity of center‐wavelength variations is 0.0129 nm/dB for noise measurement between 85.3 and 105.2 dB. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:958–961, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25844
A tunable Ti:Sapphire laser using prism‐dispersion cavity
Authors: Ma Yufei , Yu Xin , Fan Rongwei , Fan Wei 
Published: February 2011

AbstractIn this letter, a tunable Ti:sapphire laser pumped by a frequency‐doubled Q‐switched Nd:YAG laser at a repetition rate of 10 Hz is demonstrated. By using two dense flint glass prisms as dispersion element, a tuning range from 745 to 855 nm with a linewidth of 0.8 nm (FWHM) was achieved. At an incident pump energy of 40 mJ, the maximum output energy was 5.5 mJ at 800 nm with a pulse width of 23.8 ns (FWHM), which led to a slope efficiency of 36.4% from the 532 nm pump laser to the Ti:sapphire laser. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:855–856, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25860
Dual‐band bandpass filter with tunable upper passband
Authors: Feng Li‐Ying , Zheng Hong‐Xing , Sun Cheng‐Guang , Cheng Dan 
Published: February 2011

AbstractA microstrip dual‐band bandpass filter is developed in this article. Using a pair of square open‐loops coupled with a symmetric ladder‐shaped resonator, frequencies of this filter are operated at 1.57 and 2.45 GHz. The lower resonance frequency is decided by the length of the square resonators, and the higher one is done by the ladder‐shaped resonator. Therefore, both frequency and bandwidth of the upper passband can be controlled flexibly, whereas those of the lower band are fixed. Finally, a filter is fabricated based on the design topology. Measured results have shown very good performance of the filter. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:888–890, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25866
Widely tunable optical source hybrid‐integrated with wavelength‐selective double‐ring‐resonator reflector
Authors: Lee Youngsik , Lee Ho , Kim Gunwoo , Lee Seunghyun , Chung Youngchul 
Published: February 2011

AbstractA hybrid‐integrated tunable optical source composed of a wavelength‐selective reflector, which is based on a polymer double‐ring‐resonator followed by a loop‐back mirror, and a reflective semiconductor optical amplifier is proposed and fabricated.Hybrid‐integration is realized using an active alignment method. The tuning range is about 40 nm with a maximum tuning current of 42 mA. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:924–927, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25871
Compact, deep, and wide rejection bandwidth low‐pass filter using open complementary split ring resonator
Authors: Karthikeyan S. S. , Kshetrimayum Rakhesh S. 
Published: February 2011

AbstractA deep and wide rejection bandwidth, sharp cutoff and compact low‐pass filter design using open complementary split ring resonator (OCSRR), and open stub is presented in this article.OCSRR is counterpart of the open split ring resonator. The proposed low‐pass filter consist of two OCSRR connected in series. The open stubs are attached on both sides of the OCSRR. At the 3 dB cutoff frequency of 1.08 GHz, the proposed filter offers a sharp rejection and wide rejection bandwidth of more than 20 dB up to six times the cutoff frequency. The filter size is very small as 0.22 λg × 0.18 λg, where λg is the guided wavelength at the cutoff frequency. The proposed filter is fabricated and tested; the experimental results are found to be in good agreement with the simulation results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:845–848, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25874
Design of V‐shaped microstrip patch antenna at 2.4 GHz
Authors: Murmu Sudip Kumar , Misra Iti Saha 
Published: February 2011

AbstractA V‐shaped microstrip patch antenna for 2.4 GHz is designed, fabricated, and experimentally measured. The proposed antenna is designed on glass‐epoxy substrate. Here, coaxial probe feed is used to provide the RF power to the patch. The proposed design provides 50 MHz impedance bandwidth determined from 10 dB return loss for 2.4 GHz frequency band, respectively. The design is simulated using the Ansoft HFSS simulation tool. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:806–811, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25877
Erratum: Dual‐antenna diversity‐gain improvements for even‐odd mode feed network at 755 MHz
Authors: Kim J. , Kim M. , Jeon S. 
Published: February 2011

AbstractOriginally published Microwave Opt Technol Lett 53: 304–306, 2011. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53: 962, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25955(Original article DOI 10.1002/mop.25696)
A combined BDF‐semismooth Newton approach for time‐dependent Bingham flow
Authors: De Los Reyes J. C. , González Andrade S. 
Published: February 2011

AbstractThis article is devoted to the numerical simulation of time‐dependent convective Bingham flow in cavities. Motivated by a primal‐dual regularization of the stationary model, a family of regularized time‐dependent problems is introduced. Well posedness of the regularized problems is proved, and convergence of the regularized solutions to a solution of the original multiplier system is verified. For the numerical solution of each regularized multiplier system, a fully discrete approach is studied. A stable finite element approximation in space together with a second‐order backward differentiation formula for the time discretization are proposed. The discretization scheme yields a system of Newton differentiable nonlinear equations in each time step, for which a semismooth Newton algorithm is used. We present two numerical experiments to verify the main properties of the proposed approach. © 2011 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2011
Application of SnO2/MWCNTs nanocomposite for SF6 decomposition gas sensor
Authors: Dai HongFa , Xiao Peng , Lou Qing 
Published: February 2011

AbstractChemical byproducts analysis have been recognized as a powerful diagnosis method for SF6 gas‐insulated switchgear (GIS). Tin dioxide/multiwall carbon nanotubes (SnO2/MWCNTs) nanaocomposite was synthesized by a wet chemical method at room temperature, from which highly sensitive H2S sensors that can operate at room temperature were fabricated. The samples' morphology and structure were characterized by field emission scanning electron microscope (FE‐SEM), transmission electron microscopy (TEM), and X‐ray diffraction (XRD). The formation mechanism of SnO2/MWCNTs was analyzed. The results showed SnO2 was successfully incorporated on the carbon nanotubes and the sensor can detect the concentration of H2S down to the 20 ppm level at room temperature.
Issues of design and statistical analysis in controlled clinical acupuncture trials: an analysis of English‐language reports from Western journals
Authors: Shuai Ping , Zhou Xiao‐Hua , Lao Lixing , Li Xiaosong 
Published: February 2011

AbstractObjective: To investigate major methods of design and statistical analysis in controlled clinical acupuncture trials published in the West during the past six years (2003–2009) and, based on this analysis, to provide recommendations that address methodological issues and challenges in clinical acupuncture research.Method: PubMed was searched for acupuncture RCTs published in Western journals in English between 2003 and 2009. The keyword used was acupuncture.Results: One hundred and eight qualified reports of acupuncture trials that included more than 30 symptoms/conditions were identified, analyzed, and grouped into efficacy (explanatory), effectiveness (pragmatically beneficial), and other (unspecified) studies. All were randomized controlled clinical trials (RCTs). In spite of significant improvement in the quality of acupuncture RCTs in the last 30 years, these reports show that some methodological issues and shortcomings in design and analysis remain. Moreover, the quality of the efficacy studies was not superior to that of the other types of studies. Research design and reporting problems include unclear patient criteria and inadequate practitioner eligibility, inadequate randomization, and blinding, deficiencies in the selection of controls, and improper outcome measurements. The problems in statistical analysis included insufficient sample sizes and power calculations, inadequate handling of missing data and multiple comparisons, and inefficient methods for dealing with repeated measure and cluster data, baseline value adjustment, and confounding issues.Conclusion: Despite recent advancements in acupuncture research, acupuncture RCTs can be improved, and more rigorous research methods should be carefully considered. Copyright © 2011 John Wiley & Sons, Ltd.
Analysis of a composite endpoint with longitudinal and time‐to‐event data
Authors: Tseng Chi‐hong , Wong Weng Kee 
Published: February 2011

AbstractWe propose a new nonparametric test to compare treatment effects using a composite endpoint comprising a longitudinal continuous measurement and multiple time‐to‐event outcomes. The composite endpoint incorporates the severity of each outcome as measured against the whole cohort in the entire study. This new proposed test is conceptually simple and computationally easy to implement. Unlike many currently available methods, our strategy is very flexible and can be applied to many types of clinical settings including the situation where we have multiple time‐to‐event outcomes. We apply our method to reanalyze two clinical trials for Scleroderma patients and also use simulation studies to show that the performance of our method is compatible with the results from a popular method proposed by Finkelstein and Schoenfeld (Statist. Med. 1999; 18:1341–1354). Copyright © 2011 John Wiley & Sons, Ltd.
A functional multiple imputation approach to incomplete longitudinal data
Authors: He Yulei , Yucel Recai , Raghunathan Trivellore E. 
Published: February 2011

AbstractIn designed longitudinal studies, information from the same set of subjects are collected repeatedly over time. The longitudinal measurements are often subject to missing data which impose an analytic challenge. We propose a functional multiple imputation approach modeling longitudinal response profiles as smooth curves of time under a functional mixed effects model. We develop a Gibbs sampling algorithm to draw model parameters and imputations for missing values, using a blocking technique for an increased computational efficiency. In an illustrative example, we apply a multiple imputation analysis to data from the Panel Study of Income Dynamics and the Child Development Supplement to investigate the gradient effect of family income on children's health status. Our simulation study demonstrates that this approach performs well under varying modeling assumptions on the time trajectory functions and missingness patterns. Copyright © 2011 John Wiley & Sons, Ltd.
The determination of elements in welding fume by X‐ray spectrometry and UniQuant
Authors: Hurst James A. , Volpato John A. , O'Donnell Gregory E. 
Published: February 2011

AbstractWelding is a hazardous process with an associated risk of health effects related to the fume arising from the core metal, flux components and welding surface. X‐ray fluorescence (XRF) is commonly used to determine elemental concentrations as part of occupational hygiene investigations using conventional calibrations. A method is proposed to determine elements in welding fume using XRF and a fundamental parameter software package known as UniQuant®. This was found to remove the need for special dust standards being prepared as the calibration used was based on a series of standards supplied with UniQuant that would cover all sample types. A conventional calibration and UniQuant calibration were set up and elements found in welding fume were determined from tin to titanium. Samples obtained from the Health and Safety Laboratory Workplace Analysis Scheme for Proficiency (WASP) programme were also analysed by both methods for nickel, iron, manganese and chromium. For the normal calibration, average recovery results for the WASP samples were between 92 and 103% of the target value with relative standard deviations of 3‐7%. For the UniQuant calibration, average recovery results for the WASP samples were between 97 and 112% of the target value with relative standard deviations of 3‐10%. These results are well within analytical performance expectations for the type of welding fume matrix analysed. The method was applied to real welding fume samples collected from workplaces. Copyright © 2011 John Wiley & Sons, Ltd.
Analysis of hydrothermally formed corrosion layers in Ni‐base alloy 625 by combined FE‐SEM and EDXS
Authors: Habicht Wilhelm , Boukis Nikolaos , Hauer Elena , Dinjus Eckhard 
Published: February 2011

AbstractDuring experiments simulating the destruction of organic waste or the conversion of biomass with water at supercritical water conditions (SCW, T > 374 °C, p > 22.1 MPa), severe corrosion phenomena were observed. Depending on the experimental conditions applied, scale formation and precipitation of corrosion products occurred. The harsh conditions and the chemical properties of the feed solutions lead to consecutive chemical reactions with the materials involved. To study such hydrothermal reactions on simplified model systems, tubular reactors made of Ni‐based alloys were exposed to feed solutions composed of water, methanol and alkaline salts. After each experiment, the reaction tubes were cut and examined by optical microscopy. Hydrothermally formed corrosion layers were studied by field emission electron microscopy and combined energy dispersive X‐ray spectroscopy. Element line scans and mappings were performed which depicted selective dissolution of alloying elements (dealloying of Ni, Fe, Mo). The formation of the corrosion layers was accompanied by a subsequent reduction of the tube wall diameter. Atomic force microscopy gained additional morphological information; a Monte Carlo programme was applied to simulate X‐ray line scans. Copyright © 2011 John Wiley & Sons, Ltd.
The Effect of Family Member Migration on Education and Work Among Nonmigrant Youth in Mexico
Authors: Halpern-Manners Andrew 
Published: February 2011

AbstractWhile academic and policy circles have given much attention to the assimilatory experiences of Mexican immigrants in the United States, less is known about those who stay behind—an especially unfortunate oversight given the increasing number of Mexican youth with migrant family members. Of the studies on this topic, most have sought to identify the effect that migration has on youths’ migratory and educational aspirations, often using qualitative methods in individual sending communities. The present article supplements this research in two ways: (1) in addition to assessing educational outcomes, the scope of the analysis is expanded to include nonmigrants’ interaction with another homeland institution of upward mobility: the labor market; and (2) using a large demographic data set, statistical techniques are employed to adjust for unobserved selectivity into the migrant family-member population, thus accounting for a potentially serious source of bias. The results suggest that youth in migrant-sending families are less likely to complete the educational transitions leading up to postsecondary school and have a lower probability of participating in the local economy. The results also indicate that unobserved factors play a “nonignorable” role in sorting youth into migrant and nonmigrant families.
A randomised controlled trial of carer-focussed multi-family group psychoeducation in bipolar disorder
Authors: Madigan K. , Egan P. , Brennan D. , Hill S. , Maguire B. , Horgan F. , Flood C. , Kinsella A. , O’Callaghan E. 
Published: February 2011

AbstractIn a RCT of family psychoeducation, 47 carers of 34 patients were allocated to one of three groups; Multifamily Group Psychoeducation, Solution Focussed Group Therapy or Treatment as Usual. Carers in both the MFGP intervention and the SFGP arm demonstrated greater knowledge and reduction in burden than those in the TAU arm.
Expression of GAP‐43 in fibroblast cell lines influences the orientation of cell division
Authors: Zhao Junpeng , Yao Yajuan , Xu Changlei , Cheng Bei , Xu Qunyuan 
Published: February 2011

AbstractThe orientation (vertical or horizontal) of cell division is known to be critical for neural cell fate determination during neurogenesis. At the onset of neurogenesis, neurogenic progenitor cells are dividing with the cleavage plane parallel to the ventricular surface (horizontal division), which would lead to critical apical components being unequally distributed to both their two daughter cells. The daughter cells lack of inheritance is going to differentiate into the neuron. Recent studies have shown that GAP‐43 is highly expressed in horizontally dividing neural progenitor cells in the forebrain of mammals. Based on findings from in vivo studies, GAP‐43 is locally associated with the centrosome and is required for centrosome positioning, suggesting that GAP‐43 may be involved in neurogenesis through regulating the orientation of cell division. With a fibroblast cell model, our results show that both GFP expressing and control cells had the same potential (p > 0.05) with regard to dividing orientation (either vertical or horizontal to the cells long axis). On the other hand, we found that GAP‐43 was localized on the membrane instead of the centrosome during all phases of mitosis within GAP‐43 transgenic cells, but expressing of GAP‐43 could make the cells dividing more likely along their long axis (p < 0.05). Our observations suggest that GAP‐43 might link the cell membrane and spindle pole and consequently participate in controlling cleavage orientation during cell division.