bluuebunny/crossref_metadata_2025_split huggingface dataset:
Refractive‐index sensor based on tilted fiber Bragg grating interacting with multimode fiber
Authors: Jin Yongxing , Dong Xinyong , Gong Huaping , Shen Changyu 
Published: March 2010

AbstractA simple refractive‐index fiber sensor based on a tilted Bragg fiber grating (TFBG) interacting with multimode fiber (MMF) is described. The sensor structure is formed by insertion of a small section of MMF between the single‐mode fiber and the TFBG. The average reflective power in the cladding modes of the TFBG reflected a different power as the surrounding refractive index changes, while the power of the reflected Bragg mode keeps unchanged. Therefore, the power of the reflected Bragg mode can be used as a reference to compensate any possible fluctuation of the light source power. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1375–1377, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25178
Design of stepped‐impedance hairpins band‐pass filter with wide stopband performance
Authors: Ho Min‐Hua , Lin Wei‐Chen 
Published: March 2010

AbstractIn this article, the band‐pass filter (BPF) of stepped‐impedance hairpin (SIH) design having a very wide stopband performance was proposed.The filter composed of two SIHs connected by a narrow bended microstrip with the latter's middle point shorting to the ground through a via hole. A long narrow coupled microstrip was used to couple I/O signal to/from the SIH resonators. The filter operated at a quarter‐wavelength resonance condition was built for WLAN IEEE 802.11b/g (2.4/2.45 GHz) applications. The filter's upper stopband had its frequency range measured from 2.76 to 23.08 GHz with the criterion of the signal rejection levels greater than 20 dB. The stopband's upper‐end is over 9.5 f0 (with central frequency, f0 = 2.44 GHz). Experiment was conducted for the circuit validation and a good agreement was observed between the measurement and simulation. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1405–1408, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25179
A reconfigurable design for bandwidth enhancement of circularly polarized slot antennas
Authors: Hsieh Tsung‐Hsun , Row Jeen‐Sheen 
Published: March 2010

AbstractA reconfigurable design is proposed to improve the circular polarization (CP) operating bandwidth of an annular‐ring slot antenna fed with an L‐shaped coupling strip.The design involves four voltage‐controlled varactor diodes, which are placed below the slot and symmetrically distributed along the circumference of the slot. When all antenna dimensions remain constant, the CP operating frequency of the slot antenna can be decreased by varying dc voltage values. In addition, theses CP operating frequencies, which are corresponding to different dc voltage values can form a successive frequency band, and the available CP bandwidth is thus improved. Experimental results indicate that with the reconfigurable design, the 3‐dB axial‐ratio CP bandwidth can be increased by a factor of 4 for the annular‐ring slot antenna with a reflector. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1377–1380, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25192
Half‐cut disc UWB antenna with tapered CPW structure for USB application
Authors: Liu Wen‐Jian , Chu Qing‐Xin 
Published: March 2010

AbstractA novel half disc for ultra wide band (UWB) application is proposed with the beveled ground and tapered coplanar waveguide‐fed structure. Its impedance bandwidth ranges from 2.42 to 13.62 GHz, which covers the entire UWB band. Its dimension is as small as 11 mm × 29.3 mm. As a result, it can be easily integrated into the wireless USB equipments. The simulated and measured results have a relative good agreement. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1380–1384, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25193
A miniaturized low‐profile antenna for WLAN communications
Authors: Wu Weijun , Yin Yingzeng , Zhao Yulong , Zuo Shaoli 
Published: March 2010

AbstractThe design of a miniaturized low‐profile monopole patch antenna is investigated.The printed configuration consists of a shorted center‐fed circular patch and a shorted concentric parasitic annular ring. Compared with the center‐fed circular patch antennas, this ensemble is a lower profile of 0.08λ0 (at 2.442 GHz) and a smaller annular ring radius of 0.13λ0 with 13.7% impedance bandwidth VSWR ≤ 2. Also, it has an average gain 3.5 dBi and omnidirectional radiation and is suitable for indoor wireless local area networks. The measured results are in good agreement with the simulated ones. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1384–1386, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25203
Novel quantum‐molecular transporter and networking via a wavelength router
Authors: Threepak T. , Louangvilay X. , Mitatha S. , Yupapin P. P. 
Published: March 2010

AbstractWe propose a new system of a molecular‐quantum networking using the optical tweezers, where the transportation of molecules via wavelength router and network can be performed. In addition, the molecule transportation states can be identified by using the quantum states of the transporters, which can be formed in the network. The proposed fabricated material used is InGaAsP/InP, which can provide the required output signals. The design system consists of a nonlinear microring/nanoring resonator system incorporating an add/drop filter and a wavelength router. The transporter can be formed by the dark soliton, and the optical transporter is tuned and amplified by the bright soliton and transmitted into the network. In applications, the use of the proposed system incorporating a nanoscale communication and networking via wavelength router is available for long‐distance link. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1353–1357, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25204
Multiple Brillouin Stokes generation with bismuth‐based erbium‐doped fiber
Authors: Shahi S. , Harun S. W. , Dimyati K. , Tamjis M.R. , Ahmad H. 
Published: March 2010

AbstractA multiple Brillouin Stokes generation is demonstrated at extended L‐band region using the bismuth‐based erbium‐doped fiber (Bi‐EDF) in the linear cavity. A 2.15‐m long Bi‐EDF is used to provide both nonlinear and linear gains to generate a stimulated Brillouin scattering (SBS) and to amplify the generated SBS, respectively. The Brillouin erbium fiber laser operates at 1615 nm region with more than 40 Stokes and anti‐Stokes lines, and the line spacing is measured to be ∼0.09 nm. Based on the four‐wave mixing signals spacing, the dispersion coefficient of the Bi‐EDF is estimated to be ∼95 ps/nm/km. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1416–1418, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25207
High impedance wire composite right/left‐handed transmission lines
Authors: Safwat Amr M. E. 
Published: March 2010

AbstractThis article presents a balanced composite right/left‐handed (CRLH) transmission line using high impedance wire.No vias are required in the proposed implementation. However, processing of double surfaces is needed. The proposed structure provides multiple CRLH bands. The concept was validated in microstrip configuration, and equivalent circuit model was proposed and theoretical expectations were confirmed by EM simulations and measurements. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1390–1393, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25215
Membrane technology for band‐pass filter in W‐band
Authors: Vu Thanh Mai , Prigent Gaetan , Plana Robert 
Published: March 2010

AbstractThis article deals with the design of coplanar waveguide band‐pass filters in W‐band implemented on silicon membrane technology. Several topologies of filters are developed at 94 GHz: broadband filters with stubs, narrow band filters with coupled‐lines, and a pseudo‐elliptical ring. Different concepts are validated by electromagnetic simulations HFSS and by experimental results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1393–1397, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25216
A 90 nm CMOS dual‐band divide‐by‐2 and ‐4 injection‐locked frequency divider
Authors: Jang Sheng‐Lyang , Wu Yuan‐Kai , Chang Chia‐Wei , Huang Jhin‐Fang , Liu Cheng‐Chen 
Published: March 2010

AbstractA fourth‐order resonator has been implemented to design a 65 GHz injection‐locked frequency divider (ILFD) implemented in a 90 nm CMOS process.The ILFD is realized with a cross‐coupled nMOS LC‐tank oscillator with an inductor switch for frequency band selection. The LC tank can be a second‐or fourth‐order resonator depending upon the on/off state of a switch across a series‐tuned inductor. Measurement results show that at the supply voltage of 0.5 V, the free‐running frequency is from 8.68 (16.147) to 9.928 (17.89) GHz for the low‐ (high‐) frequency band. The divide‐by‐2 operational locking range is from 14.9 (30.64) to 22.2 (37.74) GHz for the low‐(high)‐frequency band. The divide‐by‐4 operational locking range is from 34.4 (64.6) to 40.35 (67) GHz for the low‐(high)‐frequency band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1421–1425, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25217
Compact and ultra‐low‐loss planar photonic crystal taper
Authors: Wahsheh Rami A. , Abushagur Mustafa A. G. 
Published: March 2010

AbstractWe propose a novel method to enhance the coupling efficiency between a dielectric waveguide and a planar photonic crystal (PC). The proposed method is based on introducing structural imperfections to change the mode size and shape inside the taper to match that of the PC line‐defect waveguide. This method involves changing both the size and position of the inner taper rods. We found that the transmission efficiency is above 88% for the size change method, while it is above 94% for the position change method. The order of which method to apply first is important. Our results show that applying the size change method, followed by the position change method increases the coupling to about 96% without affecting the transmission spectrum of the structure. We also found that the input and output taper geometries are different because light faces different scattering mechanisms when entering or exiting the line defect waveguide. (2009 Wiley Periodicals, Inc). © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1454–1459, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25222
Reply to comments on “A new formulation and solution method of electromagnetic scattering from arbitrary shaped dielectric objects”
Authors: Tezel Necmi Serkan 
Published: March 2010

AbstractIn a recent comment by Çayören et al.[Microwave Opt Technol Lett 52 (2010), 246], it is claimed that formulation of the article by Tezel [Microwave Opt Technol Lett 50 (2008), 2768–2772] is not correct. In this reply, it is shown that well known electromagnetic boundary condition on dielectrics can be defined differently which leads to simplification of the problem and proves that the formulation of the article by Tezel is correct. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1459–1460, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25223
Erratum: Characterization of uni‐traveling carrier photodiodes for high‐linearity and high‐SNR applications
Authors: Wiberg Andreas O. J. , Vukusic Josip , Sunnerud Henrik , Stake Jan , Andrekson Peter A. 
Published: March 2010

AbstractOriginally published Microwave Opt Technol Lett 52: 984–987, 2010. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1460, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25225
Exact solutions for one‐dimensional transient response of fluid‐saturated porous media
Authors: Shan Zhendong , Ling Daosheng , Ding Haojiang 
Published: March 2010

AbstractBased on the Biot theory, the exact solutions for one‐dimensional transient response of single layer of fluid‐saturated porous media and semi‐infinite media are developed, in which the fluid and solid particles are assumed to be compressible and the inertial, viscous and mechanical couplings are taken into account. First, the control equations in terms of the solid displacement u and a relative displacement w are expressed in matrix form. For problems of single layer under homogeneous boundary conditions, the eigen‐values and the eigen‐functions are obtained by means of the variable separation method, and the displacement vector u is put forward using the searching method. In the case of nonhomogeneous boundary conditions, the boundary conditions are first homogenized, and the displacement field is constructed basing upon the eigen‐functions. Making use of the orthogonality of eigen‐functions, a series of ordinary differential equations with respect to dimensionless time and their corresponding initial conditions are obtained. Those differential equations are solved by the state‐space method, and the series solutions for three typical nonhomogeneous boundary conditions are developed. For semi‐infinite media, the exact solutions in integral form for two kinds of nonhomogeneous boundary conditions are presented by applying the cosine and sine transforms to the basic equations. Finally, three examples are studied to illustrate the validity of the solutions, and to assess the influence of the dynamic permeability coefficient and the fluid inertia to the transient response of porous media. Copyright © 2010 John Wiley & Sons, Ltd.
Bifurcation analysis for a rate‐sensitive, non‐associative, three‐invariant, isotropic/kinematic hardening cap plasticity model for geomaterials: Part I. Small strain
Authors: Regueiro R. A. , Foster C. D. 
Published: March 2010

AbstractLocalized deformations such as shear bands, compaction bands, dilation bands, combined shear/compaction or shear/dilation bands, fractures, and joint slippage are commonly found in geomaterials like soil and rock. Thus, modeling their inception, development, and propagation, and effect on mechanical response of the body or structure is important. The paper will focus on one, now classical, analysis method for modeling the inception of these localized deformations for a rate‐sensitive, non‐associative, three‐invariant, isotropic/kinematic hardening cap plasticity model. Bifurcation analysis, in terms of continuous and discontinuous conditions (Int. J. Solids Struct. 1980; 16:597–605), provides the mathematical conditions under which a localized deformation mode could be admissible, and it should not to be confused with attempting to model the microstructural evolution of the geomaterial as it transitions from a nearly uniform to localized deformation response at a material point. Analysis determines that continuous and discontinuous bifurcation are different for weak discontinuity and the same for strong discontinuity, and such conditions are identified for the plasticity model. Rate sensitivity will preclude bifurcation regardless of viscosity value. Numerical examples demonstrate various plasticity model features that enable detection of localization using bifurcation analysis. All analyses are conducted currently in the small strain regime. Copyright © 2010 John Wiley & Sons, Ltd.
Numerical analysis of a one‐dimensional infiltration problem in unsaturated soil by a seepage–deformation coupled method
Authors: Garcia E. , Oka F. , Kimoto S. 
Published: March 2010

AbstractA multiphase coupled elasto‐viscoplastic finite element analysis formulation, based on the theory of porous media, is used to describe the rainfall infiltration process into a one‐dimensional soil column. Using this framework, we have numerically analyzed the generation of pore water pressure and deformations when rainfall is applied to the soil. A parametric study, including rainfall intensity, soil–water characteristic curves, and permeability, is carried out to observe their influence on the changes in pore water pressure and volumetric strain. From the numerical results, it is shown that the generation of pore water pressure and volumetric strain is mainly controlled by material parameters α andn′ that describe the soil–water characteristic curve. A comparison with the laboratory results shows that the proposed method can describe very well the characteristics observed during the experiments of one‐dimensional water infiltration into a layered unsaturated soil column. Copyright © 2010 John Wiley & Sons, Ltd.
Sex dimorphism in gray/white matter volume and diffusion tensor during normal aging
Authors: Abe Osamu , Yamasue Hidenori , Yamada Haruyasu , Masutani Yoshitaka , Kabasawa Hiroyuki , Sasaki Hiroki , Takei Kunio , Suga Motomu , Kasai Kiyoto , Aoki Shigeki , Ohtomo Kuni 
Published: March 2010

AbstractThe purpose of this study is to elucidate sex differences in global and regional gray/white matter volume, mean diffusivity (MD), and fractional anisotropy (FA) during normal aging using voxel‐based analysis. We studied 245 healthy right‐handed subjects with a wide range of ages (115 women, 22–70 years; 130 men, 21–71 years). Regarding global effects, inclusion of a quadratic age term improved the fit to data for white matter fraction and MD, but not for global gray matter volume/fraction or FA. Regarding regional effects, we found anterior‐dominant volume loss, FA decrease predominantly in the anterior white matter, and MD increase predominantly in perisylvian regions and periventricular white matter against age for both sexes. Compared with women, we found a steeper FA decline for men in the right inferior fronto‐temporal areas, extending to the anterior cingulate cortex, and an accelerated MD increase for men in the bilateral frontal, temporal, and parietal areas. There was no area in which interaction of sex with age was significant for regional volume, or in which a steeper FA decline or accelerated MD increase for women was significant. Our results provide strong evidence of sex dimorphism in global and focal diffusion characteristics during normal aging. Copyright © 2010 John Wiley & Sons, Ltd.
Generalized ℋ︁2 model approximation for differential linear repetitive processes
Authors: Wu Ligang , Zheng Wei Xing , Su Xiaojie 
Published: March 2010

AbstractThis paper investigates the generalized ℋ︁2 model approximation for differential linear repetitive processes (LRPs). For a given LRP, which is assumed to be stable along the pass, we are aimed at constructing a reduced‐order model of the LRP such that the generalized ℋ︁2 gain of the approximation error LRP between the original LRP and the reduced‐order one is less than a prescribed scalar. A sufficient condition to characterize the bound of the generalized ℋ︁2 gain of the approximation error LRP is presented in terms of linear matrix inequalities (LMIs). Two different approaches are proposed to solve the considered generalized ℋ︁2 model approximation problem. One is the convex linearization approach, which casts the model approximation into a convex optimization problem, while the other is the projection approach, which casts the model approximation into a sequential minimization problem subject to LMI constraints by employing the cone complementary linearization algorithm. A numerical example is provided to demonstrate the proposed theories. Copyright © 2010 John Wiley & Sons, Ltd.
Chemical characterization of Azadirachta indica grafted on Melia azedarach and analyses of azadirachtin by HPLC‐MS‐MS (SRM) and meliatoxins by MALDI‐MS
Authors: Forim Moacir Rossi , Cornélio Vivian Estevam , das G. F. da Silva M. Fátima , Rodrigues‐Filho Edson , Fernandes João B. , Vieira Paulo C. , Matinez Sueli Souza , Napolitano Michael P. , Yost Richard A. 
Published: March 2010

AbstractIntroduction – Melia azedarach adapted to cool climates was selected as rootstocks for vegetative propagation of Azadirachta indica. Cleft grafting of A. indica on M. azedarach rootstock showed excellent survival. Little is known about the chemistry of grafting.Objective – The roots, stems, leaves and seeds of this graft were examined in order to verify if grafted A. indica would produce limonoids different from those found in non‐grafted plants. Intact matured fruits were also studied to verify if they were free of meliatoxins.Methodology – After successive chromatographic separations the extracts afforded several limonoids. HPLC‐MS/MS and MALDI‐MS were used to develop sensitive methods for detecting azadirachtin on all aerial parts of this graft and meliatoxins in fruits, respectively.Results – The stem afforded the limonoid salannin, which was previously found in the oil seeds of A. indica. Salannin is also found in the root bark of M. azedarach. Thus, the finding of salannin in this study suggests that it could have been translocated from the M. azedarach rootstock to the A. indica graft. HPLC‐MS/MS analyses showed that azadirachtin was present in all parts of the fruits, stem, flowers and root, but absent in the leaves. The results of MALDI‐MS analyses confirmed the absence of meliatoxins in graft fruits.Conclusion – This study showed that A. indica grafted onto M. azedarach rootstock produces azadirachtin, and also that its fruits are free of meliatoxins from rootstocks, confirming that this graft forms an excellent basis for breeding vigorous Neem trees in cooler regions. Copyright © 2010 John Wiley & Sons, Ltd.
Analysis of sesterterpenoids from Aspergillus terreus using ESI‐QTOF and ESI‐IT
Authors: Wu Zhi‐Jun , Fang Dong‐Mei , Han Dan , Li Guo‐You , Chen Xiao‐Zhen , Qi Hua‐Yi , Zhang Guo‐Lin 
Published: March 2010

AbstractIntroduction – Biosynthesis of terretonin was studied due to the interesting skeleton of this series of sesterterpenoids. Very recently, López‐Gresa reported two new sesterterpenoids (terretonins E and F) which are inhibitors of the mammalian mitochondrial respiratory chain. Mass spectrometry (MS), especially tandem mass spectrometry, has been one of the most important physicochemical methods for the identification of trace natural products due to it rapidity, sensitivity and low levels of sample consumption. The potential application prospect and unique skeleton prompted us to study structural characterisation using MS.Objective – To obtain sufficient information for rapid structural elucidation of this class of compounds using MS.Methodology – The elemental composition of the product ions was confirmed by low‐energy ESI‐CID‐QTOF‐MS/MS analyses. The fragmentation pathways were postulated on the basis of ESI‐QTOF‐MS/MS/MS and ESI‐IT‐MSn spectra. Common features and major differences between ESI‐QTOF‐MS/MS and IT‐MSn spectra were compared. For ESI‐QTOF‐MS/MS/MS experiments, capillary exit voltage was raised to induce in‐source dissociation. Ammonium acetate or acetic acid were added into solutions to improve the intensity of [M + H]+. The collision energy was optimised to achieve sufficient fragmentation. Some fragmentation pathways were unambiguously proposed by the variety of abundance of fragment ions at different collision energies even without MSn spectra.Results – Fragmentation pathways of five representative sesterterpenoids were elucidated using ESI‐QTOF‐MS/MS/MS and ESI‐IT‐MSn in both positive‐ and negative‐ion mode. The key group of characterising fragmentation profiles was ring B, and these fragmentation patterns are helpful to identify different types of sestertepenoids.Conclusion – Complementary information obtained from fragmentation experiments of [M + H]+ (or [M + NH4]+) and [M − H]− precursor ions is especially valuable for rapid identification of this kind of sesterterpenoid.