bluuebunny/crossref_metadata_2025_split huggingface dataset:
Measurements of the Kinetics of the Reaction of OH Radicals with 3‐Methylfuran at Low Pressure
Authors: Liljegren Jennifer A. , Stevens Philip S. 
Published: August 2013

ABSTRACTThe rate constant for the reaction of OH with 3‐methylfuran was measured at 2, 4, and 6 Torr using discharge‐flow techniques coupled with laser‐induced fluorescence detection of OH. The measured rate constant (k) at 298 ± 2 K was (9.1 ± 0.3) × 10−11 cm3 molecule−1 s−1, where the quoted uncertainty reflects twice the standard error of the measurements. This result is in good agreement with previously reported relative rate constant measurements at atmospheric pressure and room temperature. An Arrhenius expression of k = (3.2 ± 0.4) × 10−11 e(310 ± 40)/T cm3 molecule−1 s−1 was determined from measurements of the rate constant between 273 and 368 K. The negative temperature dependence agrees with previously reported theoretical calculations for the reaction of OH with 3‐methylfuran and previously reported measurements of the temperature dependences of the rate constants for the reaction of OH with similar heterocyclic organics such as furan and thiophene.
Some scales of equivalent conditions to characterize the Stieltjes inequality: the case
Authors: Gogatishvili Amiran , Persson Lars‐Erik , Stepanov Vladimir D. , Wall Peter 
Published: August 2013

We prove that the weighted Stieltjes inequality

urn:x-wiley:dummy:mana201200118:equation:mana201200118-math-0003can be characterized by four different scales of conditions also for the case , . In particular, a new proof of a result of G. Sinnamon is given, which also covers the case . Moreover, for the situation at hand a new gluing theorem and also an equivalence theorem of independent interest are proved and discussed. By applying our new equivalence theorem to weighted inequalities for the Stieltjes transform we obtain the four new scales of conditions for characterization of Stieltjes inequality.
Heat treatment of egg white controls allergic symptoms and induces oral tolerance to ovalbumin in a murine model of food allergy
Authors: Watanabe Hiroko , Toda Masako , Sekido Haruko , Wellner Anne , Fujii Tomoyuki , Henle Thomas , Hachimura Satoshi , Nakajima‐Adachi Haruyo 
Published: August 2013

ScopeHeated foods often present low allergenicity, and have recently been used in specific oral immunotherapy for food allergies. However, the influence of heating on tolerogenicity of food allergens is not well elucidated. Here, we investigated biochemical, allergenic, and tolerogenic properties of heated egg white (EW) using a murine model of food allergy.Methods and resultsRaw EWs were treated at 80°C for 15 min (80EW, mild heating condition), 100°C for 5 min (100EW, cooking condition), or 121°C for 40 min (121EW, retort pouch condition), and freeze‐dried. A transgenic OVA23–3 mice model expressing T‐cell receptor specific for ovalbumin (OVA, a major EW allergen) induced Th2 cells and IgE production, and presented intestinal inflammation when fed untreated EW diet. 80EW‐fed mice presented only moderate inflammation but high Th2 responses. 100EW‐fed mice did not present inflammation but induced tolerance as seen in reduced T‐cell responses and IgE levels. 100EW demonstrated higher digestive stability and slower absorption in intestine, compared with untreated EW and 80EW. 121EW was strongly aggregated, was not absorbed well, and developed Th1 responses without tolerance induction.ConclusionOVA in EW treated only under a particular heat condition (e.g. 100°C for 5 min) lost allergenicity, but possessed tolerogenicity.
Analysis of a coaxial probe‐fed circular waveguide
Authors: Dey Ranajit , Chakrabarty S. B. , Jyoti Rajeev 
Published: August 2013

ABSTRACTThis article presents the investigation on the applicability of variational technique for the estimation of input impedance of a coaxial line fed probe in a circular cylindrical waveguide based on thin current approximation. In this work, the lower limit of diameter of the probe for which thin current approximation is valid has been established. The variation of input impedance has been studied as a function of probe height, short length from the probe as well as diameter of the probe. The convergence of the solution based on variational technique is checked in terms of the number of higher order modes of circular cylindrical waveguide excited at the asymmetrical junction of probe. The limitation of the existing technique has been ascertained using the finite element method based simulator high frequency structure synthesizer (HFSS) and experimental validation. The simulated result based on HFSS is in excellent agreement with the experimental results. Bandwidth performance with variation in diameter has also been studied using HFSS simulator with varying probe diameter. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2652–2656, 2013
Wideband nonlinear characteristics of random multiwalled carbon nanotubes network
Authors: Oueriemi I. , Raskin J.‐P. , Choubani F. , Huynen I. 
Published: August 2013

ABSTRACTIn this work, multiwalled carbon nanotubes (MWCNTs) were randomly deposited in gaps of microstrip interdigitated capacitive (IDC) structure. Measured I‐V characteristics show nonlinear behavior of MWCNTs. Supported by an analytical Schottky‐based model, the nonlinear mechanism is attributed to semiconductor/metallic (S/M) junction properties. Measuring the IDC over a wide frequency band, from 1 kHz up to 3 GHz, we demonstrate there is a maximum frequency (∼10 MHz) beyond which the nonlinear behavior of the MWCNTs network vanishes. An equivalent lumped element circuit for MWCNTs‐based IDC describes well the measured behavior up to 3 GHz. Thanks to the extracted equivalent circuit, we demonstrate that the capacitive couplings between MWCNTs dominate over nonlinear effects above 10 MHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2648–2652, 2013
X‐band MMIC GaN power amplifier for SAR systems
Authors: Giofre Rocco , Colantonio Paolo , Giannini Franco 
Published: August 2013

ABSTRACTThis contribution describes the design, realization, and test of a compact X‐band GaN MMIC high power amplifier (HPA) for synthetic aperture radar. The HPA represents the first step toward the realization of a fully integrated GaN transmitter/receiver (Tx/Rx) for X‐band applications. The circuit is designed in a two stage configuration and it is fully matched to 50 Ω input and output impedance. The chip area is less than 10 mm. Experimental results show an output power close to 42 dBm with a gain of 16 dB (at 3 dB of compression) and a ripple lower than 0.5 dB from 8.6 to 10.6 GHz frequency range. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2611–2616, 2013
Fiber‐length‐dependence phase noise of injection‐locked optoelectronic oscillator
Authors: Hong Jun , Yao Sheng‐Xing , Li Zu‐Lin , Huang Jun‐Xin , Fang Xiao‐Wei , Guo Jian 
Published: August 2013

ABSTRACTA novel model of injection‐locked dual optoelectronic oscillator (ILD‐OEO) is proposed and verified by experiments in this article. We not only built an accurate model for ILD‐OEO but also analyzed the influence of fiber length on the white noise‐limited phase noise of ILD‐OEO. Results show that the single sideband (SSB) phase noise would increase when fiber delay line is long enough. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2568–2571, 2013
The noise figure and gain improvement of double‐pass C‐band EDFA
Authors: Yucel Murat , Aslan Zuhal 
Published: August 2013

ABSTRACTIn this study, the noise figure (NF) improvement is demonstrated in double‐pass C‐band erbium‐doped fiber amplifier. It is used the short length of unpumped erbium doped fiber (EDF) within a circulator‐based loop mirror which is reduced amplified spontaneous emission (ASE). The unpumped EDF attenuates part of the ASE that is then reflected back for a double pass configuration which in turn, helps to improve the gain and NF. The proposed configuration has lower NF and higher gain than conventional double pass scheme. Thus, it can be easily applied for practical application. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2525–2528, 2013
Capacity enhancement of virtual‐mirror‐based multiwavelength Brillouin‐erbium fiber laser
Authors: Rahman Zubaidah Abd , Hitam Salasiah , Al‐Mansoori Mohammed H. , Abu Bakar Muhammad H. , Mahdi Mohd A. 
Published: August 2013

ABSTRACTAn enhanced multiwavelength Brillouin‐erbium fiber laser with virtual mirror concept is demonstrated. The performance of three linear amplifier schemes is investigated and optimized. Wide tuning range of 39 nm and maximum of nine laser lines are achieved utilizing a 915 nm pump laser at 616 mW pump power. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2549–2553, 2013
Design and implementation of dual‐band and triple‐band substrate integrated coaxial line filters
Authors: Jiang Mei , Hong Wei , Zhang Yan 
Published: August 2013

ABSTRACTIn this article, dual‐band and triple‐band filters are proposed based on the substrate integrated coaxial line (SICL) technique. The SICL resonator and the coupling between the bandpass–bandpass resonators and bandpass–bandstop resonators are investigated, then single‐bandpass, dual‐bandpass, and triple‐bandpass filters are designed, fabricated, and measured. The dual‐band or triple‐band filters are equivalent to the combinations of one bandpass and one or two bandstop filters, and so can be easily synthesized from the generalized lowpass prototypes with Chebyshev responses. The measured results are in good agreement with the simulations. A size reduction of more than 45% has been achieved compared with the published substrate integrated waveguide filters. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2734–2738, 2013
Fields produced at any distance by a Hertzian dipole – generalizations – approximations
Authors: Knop Charles M. 
Published: August 2013

ABSTRACTThe exact integral expressions for the azimuthal magnetic field, Hφ (r/h,θ), and the polar electric field, Eθ (r/h, θ), produced at any polar‐angle, θ, and at any distance, r, from the center of a Hertzian dipole of height h were recently derived‐reported in this journal (Knop, Microwave Opt Technol Lett 54 (2012), 1970–1975). Numerical computations‐plots of these fields as a function of the polar angle θ with the distance parameter of r/h were there given for the case of a dipole of h/λ = 0.10, where λ is the free space operating wavelength. These computations‐plots are here extended to the cases of h/λ = 0.05 and 0.01. Computations and plots of these fields as a function of r/h with θ as a parameter are also given. Critical comparisons to the h/λ = 0.10 case are then made and generalizations formed for the fields' behavior as h/λ decreases. Approximate closed‐form equations/formulas for the fields are also presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2726–2734, 2013
A CMOS quadrature VCO implemented with direct capacitor injection‐locking
Authors: Jang Sheng‐Lyang , Lin Yu‐Sheng , Chang Chia‐Wei , Hsue Ching‐Wen , Juang Miin‐Horng , Teng Heng‐Fa 
Published: August 2013

ABSTRACTThis article presents a new quadrature voltage‐controlled oscillator (QVCO). The LC‐tank QVCO consists of two first‐harmonic injection‐locked oscillators (ILOs). The outputs of one ILO are injected to the common nodes of capacitors on the other ILO and vice versa so as to force the two ILOs operate in quadrature. At the supply voltage of 1.1 V, the total power consumption is 5.94 mW. The free‐running frequency tuning range is 11.5%, tunable from 6.56 to 7.36 GHz as the tuning voltage is varied from 0.0 to 2 V. The QVCO has been implemented with the TSMC 0.18‐μm CMOS technology and the die area is 0.504 × 0.803 mm2. The measured phase noise at 1‐MHz offset is −123.01 dBc/Hz at the oscillation frequency of 7.34 GHz and the figure of merit of the proposed QVCO is about −192.5 dBc/Hz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2528–2531, 2013
Compact UWB power divider with tunable notch‐band based on dual‐mode SIR
Authors: Chen Lei , Wei Feng 
Published: August 2013

ABSTRACTAn ultra‐wideband (UWB) power divider (PD) with an electronically tunable notch‐band based on single dual‐mode stepped‐impedance resonator (SIR) is investigated in this article. The proposed UWB PD is based on conventional Wilkinson PD, while two folded shunt quarter‐wavelength short‐circuited stubs are adding to two symmetrical output ports. The dual‐mode SIR with a varactor diode and dc bias is studied and used to generate desired tunable notched band. The predicted results are compared with measured data and good agreement is reported. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2709–2712, 2013
Bandwidth enhancement using gap‐coupled hexagonal microstrip antennas in L band
Authors: Rashmi Ritu , Prasan Ray Kamla , Duttagupta Sidhartha P. 
Published: August 2013

ABSTRACTNew configurations, involving parasitic gap coupling of identical hexagonal microstrip antennas, are investigated to enhance the bandwidth. A better coupling between the driven and the parasitic patches is realized owing to the straight sides of the hexagonal microstrip antennas. The overall configuration exhibits an enhanced gain due to the increased aperture size. Different gap‐coupled configurations, including a novel configuration of the off‐axis gap coupling of three hexagonal microstrip antennas, are presented. For this novel configuration, measured bandwidth as large as 101.2 MHz at the center frequency of 1.884 GHz has been obtained, this is almost four times as compared to that of a single hexagonal patch. Both on‐axis and off‐axis gap coupling of three hexagonal microstrip antennas are explored and the off‐axis configuration demonstrates a bandwidth enhancement of ∼1.35 times over that of the on‐axis configuration. For all the configurations, measured and simulated bandwidths are in close agreement. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2703–2709, 2013
Reconfigurable bandstop filter with tunable center frequency and bandwidth using piezoelectric transducer
Authors: Jun Sungyun , Chang Kai 
Published: August 2013

ABSTRACTA reconfigurable bandstop filter with tunable center frequency and bandwidth using a piezoelectric transducer (PET) is presented. The proposed reconfigurable bandstrop filter consists of a PET and two quarter‐wavelength open‐stub microstrip lines. Tuning center frequency and bandwidth are achieved by varying the dielectric constants of a quarter‐wavelength open‐stub microstrip line using a controlled dielectric perturber under a PET in two quarter‐wavelength open‐stub microstrip lines. The proposed filter has a 8.7% tuning range at center freuqnecy from 4.62 to 5.06 GHz and 29% tuning range of bandwidth (>25 dB) from 990 to 1280 MHz with varied DC voltages. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2670–2672, 2013
Bandwidth and gain enhancement of a series‐fed two‐dipole array antenna using nearby parasitic director
Authors: Yeo Junho , Lee Jong‐Ig 
Published: August 2013

ABSTRACTThis article presents a simple method of enhancing the bandwidth and gain of a series‐fed two‐dipole array (STDA) antenna by using a nearby parasitic director. In order to improve the bandwidth and gain characteristics of the STDA antenna, a parasitic director using a single strip is employed at a location close to the top dipole element. The effects of the location and size of the director on the impedance bandwidth and realized gain characteristics are investigated. A prototype of the proposed antenna is fabricated on an FR4 substrate, and its performance is compared with the conventional STDA antenna operating in a frequency band of 1.7–2.7 GHz with a gain > 5 dBi. The experimental results show that the enhancement in the bandwidth for a voltage standing wave ratio < 2 is 18.53%, and the improvement in the bandwidth for a gain > 5 dBi is 32.75%. In addition, the increment in the averaged peak gain for a gain > 5 dBi is 0.85 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2782–2787, 2013
Reconfigurable bandpass filter with center frequency and bandwidth control
Authors: Psychogiou Dimitra , Peroulis Dimitrios 
Published: August 2013

ABSTRACTThis article presents a bandpass filter with independent center frequency and bandwidth control. It is based on four frequency‐reconfigurable resonators arranged in a series cascade of a second‐order bandpass filter and a dual‐behavior resonator. A measured bandpass filter response with variable bandwidth between 440 and 0 MHz is demonstrated at 3.6 GHz. The center frequency of the filter can be continuously varied between 2.76 and 3.79 GHz (1.4:1) with continuous bandwidth variation between 300 and 100 MHz (3:1) for a minimum out‐of‐band isolation of −15 dB and insertion loss between 0.76 and 2.5 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2745–2750, 2013
A novel ultrawideband bandpass filter with one notch‐band and wide stopband
Authors: Yang Fan , Wei Feng , Liu Shu‐Fang , Shi Xiao‐Wei 
Published: August 2013

ABSTRACTA novel ultrawideband bandpass filter with one notch‐band, high selectivity, and wide stopband is investigated in this article. The basic filter is composed of two microstrip‐slot transitions with novel annular stubs, which are used to obtain the required bandwidth with high selectivity. And, a cross‐coupling between the feed lines (input and output) is introduced to broaden the stopband. In addition, a short‐circuited stepped‐impedance resonator is used to obtain one notch‐band. The simulated and experimental performances are presented in this work where good agreement is obtained. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2624–2628, 2013
Radiated power enhancement of quadrupole source using metamaterials
Authors: Mitra Debasis , Paul Sandip , Bhattacharya Dhrubajyoti , Bhadra Chaudhuri Sekhar Ranjan 
Published: August 2013

ABSTRACTAn investigation of radiated power enhancement of infinitesimal quadrupole source using metamaterial shell is presented. It has been demonstrated that a double negative shell surrounding the quadrupole can cancel both the self and mutual reactance within the quadrupole elements. Moreover, a uniform gain characteristic can be achieved over a wide range of shell thickness. The effects of loss, present in the metamaterial shell, are also taken into account for this investigation. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2620–2624, 2013
Design of a 2×2 tapered dielectric‐loaded helical antenna array for INMARSAT‐M satellite system
Authors: Manoochehri Omid , Abbasiniazare Seyyedpayam , Forooraghi Keyvan 
Published: August 2013

ABSTRACTIn this paper, design and fabrication of an L‐band axial mode 2 × 2 tapered dielectric‐ loaded helical antenna array for international maritime satellite organization (INMARSAT)‐M mobile vehicles are presented. This array has compact size and light weight. By adding a tapered cylindrical dielectric resonator, for satellite communications, important parameters such as gain, side lobe level, impedance matching and axial ratio bandwidth have been improved simultaneously. This array has a gain of 15.1 dB, a radiation pattern with a side lobe level of –21 and a –3 dB axial ratio bandwidth is nearly 15%. These characteristics are suitable for INMARSAT‐M antennas. A good agreement between the simulated and measured results has been achieved. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2600–2604, 2013
Compact printed monopole antenna for ultra‐wideband application with dual band‐notched characteristic
Authors: Sarkar Manas , Dwari Santanu , Daniel Anitha 
Published: August 2013

ABSTRACTIn this article, a compact ultrawideband (UWB) microstrip‐fed printed monopole antenna with dual band‐notched characteristics is proposed. The proposed design consists of a radiating patch with semielliptical shape and the modified ground plane with two bevels on the upper edge of the ground plane to cause the wideband from 3.1 to 10.6 GHz for UWB application. In addition, cutting two semicircular slots on the bottom edge of the ground plane, operating band is further extended above 10.6 GHz. The band notch at the two bands 3.4–3.6 GHz and 5.6–5.8 GHz is achieved using a pair of concentric annular slots with splits in them in opposite side. Fine tuning is possible with adjusting the length and radius of those slots. The antenna size is 24 × 34.6 mm and designed using FR4 substrate having εr = 4.4 and thickness of 0.8 mm. Design and optimizations have been carried out using HFSS v13.0 and there is good agreement with measured results. The proposed antenna exhibits a nearly omnidirectional radiation pattern in the H‐plane, and a dipole‐like radiation pattern in the E‐plane for the entire pass band. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2595–2600, 2013
Design and analysis of a meandered multiband antenna based on split ring resonator
Authors: Sharma Ashish , Gupta Surendra K. , Kanaujia Binod K. , Pandey Ganga P. , Sharma Manish 
Published: August 2013

ABSTRACTThis article presents design and analysis of a novel compact circular patch microstrip antenna to be used for multiple services. The study is done on a circular patch antenna loaded with four slits which has a meandering effect on the surface currents along with a single unit cell of a split ring resonator (SRR) printed with copper on a substrate for the multiband operations. Circuit model of SRR configuration is also presented. The proposed antenna configuration is simulated and theoretically analyzed. The antenna is fabricated for best performance. The theoretical and simulated results are found to be in close agreement with measured results. Furthermore, parametric analysis is done by varying the height of SRR and gap width between the two SRR rings. Proposed configuration with a compactness of around 28%, and a broad beam width with high‐efficiency cover X‐band of microwave regime between 6 and 12 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2787–2795, 2013
Design of a compact wideband circularly polarized microstrip antenna
Authors: Liu Qiang , Liu Yuanan , Wu Yongle , Li Shulan , Yu Cuiping 
Published: August 2013

abstractA compact wideband feed network comprising a dual‐band Wilkinson power divider and a broadband 90° phase shifter is presented. Taking advantage of the coupled‐line section, the feed network achieves both compact circuit configuration and wideband performance. A compact wideband circularly polarized (CP) antenna using the wideband feed network achieves measured impedance bandwidth (|S11| ≤ –10 dB) of 65%, 3‐dB axial ratio bandwidth of 63%, and peak gain of 8.8 dBi. Above all, the proposed CP antenna features most compact size with the demensions of 0.64 λ0 × 0.64 λ0 × 0.054 λ0 and achieves the trade‐offs between the performance and the demension. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2531–2536, 2013
A novel multifrequency hybrid antenna
Authors: Bhattacharya (Mitra) Sriparna , Gupta Bhaskar 
Published: August 2013

ABSTRACTA hybrid multifrequency antenna is designed by using a cubic dielectric resonator antenna and coplanar wave guide (CPW) loop radiator. The dielectric resonator antenna (DRA) is also excited by the same CPW. The DRA in conjunction with the CPW loop generates multiple frequencies which may be controlled by optimizing the dimension of the DRA and the dimensions of the CPW slot. Six different resonant frequencies are observed between 2 and 7 GHz. The return loss, radiation pattern, and gain are measured for the antenna in all six different frequencies. The simulated and experimental results show good match. The proposed antenna can be used for mobile and wireless LAN communication. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2712–2715, 2013