bluuebunny/crossref_metadata_2025_split huggingface dataset:
In Search of Negativity Bias: An Empirical Study of Perceived Helpfulness of Online Reviews
Authors: Wu Philip Fei 
Published: October 2015

ABSTRACTA basic tenet of psychology is that the psychological effects of negative information outweigh those of positive information. Three empirical studies show that the negativity bias can be attenuated or even reversed in the context of electronic word of mouth (eWoM). The first study analyzes a large sample of customer reviews collected from Amazon.com and concludes that negative reviews are no more helpful than positive ones when controlling for review quality The second study follows up with a virtual experiment that confirms the lack of negativity bias in evaluating the helpfulness of online reviews. The third study demonstrates that the negativity effect can be reversed by manipulating the baseline valences. This work challenges the conventional wisdom of “bad is stronger than good” and contributes to the understanding of the eWoM phenomenon.
Satellite based remote sensing of weather and climate: recent achievements and future perspectives
Authors: Thies B. , Bendix Jörg 
Published: October 2015

AbstractSpaceborne remote sensing provides valuable information about the state of the Earth‐atmosphere system and its components in an area‐wide and continuous manner. Over the past 50 years a range of satellite platforms carrying many different sensors has been constructed to monitor atmospheric parameters used in meteorological and climatological studies, and the information retrieved from satellite‐based sensors has greatly enhanced our understanding of the processes and dynamics within the Earth‐atmosphere system. The present paper gives an overview of existing satellites and sensors, together with the developed algorithms to retrieve meteorological and climatological parameters. Furthermore, it gives an outlook on new systems planned for the near future. Copyright © 2011 Royal Meteorological Society
Perforators as recipients for free flap reconstruction of the inguinal and perineal region
Authors: Seo Bommie F. , Yun Choi Jong , Ho Han Hyun , Young Oh Deuk , Won Rhie Jong , Tae Ahn Sang , Moon Suk‐Ho 
Published: October 2015

ObjectiveExtensive defects of the perineal or inguinal area require well vascularized free flap coverage. This area has an abundance of perforating arteries and veins based on vessels from the femoral artery and internal iliac artery. We present our experience on the use of perforators as recipient vessels in reconstructing soft tissue defects of the perineal and inguinal area with free flaps.Patients and MethodsFrom March 2012 to August 2014, 13 patients underwent free flap reconstruction for soft tissue defects of the inguinal or perineal area. Perforating arteries with diameters ranging from 0.7 to 1.2 mm were used as recipient arteries. Accompanying veins or neighboring superficial veins were secured as recipient veins.ResultsAll flaps survived attached to a recipient perforator with a diameter ranging from 0.7 to 1.2 mm. These vessels were found in the inguinal or perineal areas, regions that are supplied by the superficial circumflex iliac vessels, superficial inferior epigastric vessels, superficial and deep external pudendal vessels, lateral and medial circumflex femoral vessels, and internal pudendal vessels. There were no cases of arterial insufficiency or venous congestion, flap necrosis, or infection. A single case of hematoma beneath the flap was treated by simple evacuation. There were no donor complications.ConclusionUsing perforators as the recipient during free flap reconstruction of the inguinal and perinea area allows the surgeon to choose from a wider choice of vessels, and yields acceptable flap survival. © 2015 Wiley Periodicals, Inc. Microsurgery 35:627–633, 2015.
An optimization study on cost‐efficient dipole and bow‐tie antenna designs for printed UHF RFID
Authors: Pongpaibool Pornanong , Jantarachote Vasan , Siwamogsatham Siwaruk 
Published: October 2015

AbstractIn this study, the optimized cost‐efficient dipole and bow‐tie antenna designs with thickened feeds are derived via simulations for the printed ultra high frequency radio‐frequency identification (UHF RFID) tags. The results show that the proposed optimized antenna designs requires significantly less amount of conductive material in achieving the same level of antenna efficiency performance as the ideal copper‐trace design. For instance, the saving benefits are around 30 and 65%, respectively, for the dipole and bow‐tie configurations when comparing with the conventional flat layer dipole antenna designs. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2676–2679, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26300
A novel Doherty power amplifier with self‐adaptive biasing network for efficiency improvement
Authors: Chen Shichang , Xue Quan 
Published: October 2015

AbstractA Doherty power amplifier (DPA) with a self‐adaptive biasing circuit is presented in this letter. The proposed structure is integrated into the gate biasing network of the peaking power amplifier (PA), and then the gate voltage can be adaptively adjusted with the input power. Due to the presence of this simple but effective circuit, the peaking PA can approach the ideal power transfer characteristic which results in better efficiency than the conventional design with constant biasing. The proposed circuit is implemented and compared with both the conventional DPA and a single Class‐AB PA. 12% and 34% power added efficiency improvements are achieved at 6 dB backoff, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2586‐2589, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26301
Planar rat‐race coupler with microstrip electromagnetic bandgap element
Authors: Zhang Chris F. 
Published: October 2015

AbstractThis article presents the design of microstrip electromagnetic bandgap element and its applications in the planar rat‐race hybrid coupler with the purpose of harmonic suppression and size reduction.The measured results of proposed hybrid coupler with 1.25 GHz central frequency verify its attractive performance with an insertion loss of less than 3.4 dB, a return loss of about 20 dB, an isolation of 32 dB, 17 dB suppression for the second harmonic, 25 dB suppression for the third harmonic, and 22 dB suppression for the fourth harmonic. In particular, with no loss of the performance, the area of proposed rat‐race coupler, achieving 57% save in size, has been successfully reduced from 38.82 cm2 (the area of conventional hybrid coupler) to 16.72 cm2. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2619–2622, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26308
LTCC ultra wide band filter
Authors: Packiaraj D. , Vinoy K.J. , Ramesh M. , Kalghatgi A.T. , Chaware Varsha , Phatak G. J. 
Published: October 2015

AbstractThis article presents the analysis of ultra wide band (UWB) filter designed using a symmetrical three parallel coupled line resonator in low temperature co‐fired ceramic (LTCC) medium. The ground plane with an aperture incorporated in it improves the coupling. Based on circuit models, the designed UWB filter has been analyzed, and the results have been confirmed by experiments. The filter has been realized with Dupont LTCC tape DuPont 951 (that has dielectric constant of 7.8). Maximum insertion loss of the experimental filter is 1.5 dB. The group variation over the pass band of the filter is within 0.2 ns. Dimensions of the experimental LTCC filter are 20 × 10 × 0.72 mm. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2580–2583, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26311
CPW‐fed‐slot planar antenna for wireless applications
Authors: Tony D. , Sarin V. P. , Nishamol M. S. , Anandan C. K. , Mohanan P. , Vasudevan K. 
Published: October 2015

AbstractA compact dual‐band antenna for wireless applications is proposed. The proposed antenna provides 2:1 voltage standing wave ratio (VSWR) impedance bandwidth of 590 MHz centered at 2.6 GHz and 3.09 GHz centered at 6.19 GHz. The antenna is fabricated on a substrate of dielectric constant 4.4 and thickness 1.6 mm, occupies an area of 36.9 × 18 mm2. Details of the proposed antenna design along with experimental and simulation results are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2501–2504, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26315
Novel optical cryptography using LIP signals generated by a PANDA ring resonator
Authors: Pongsanam P. , Juleang P. , Mitatha S. , Yupapin P. P. 
Published: October 2015

AbstractWe propose a novel optical cryptography using the dark‐bright soliton conversion control in a modified add/drop (AD) optical filter. By using the control arrangement, the obtained outputs of the dynamic states of dark‐bright soliton can be used to form the key suppression which can be available for communication security application, where finally, the key recovery can be obtained by controlling the AD filter outputs. The optical cryptography part consists of an AD filter which is used to generate the encrypted and decryption keys from the optical keys (LIP signals), and a Mach–Zehnder interferometer is also used for multiplexing and de‐multiplexing operations. The simulation results obtained have shown that the proposed system can be achieved, which can be used to form high security communication. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2575–2580, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26324
Behavioral electromagnetic models of high‐speed p‐i‐n photodiodes
Authors: Jiang Chenhui , Krozer Viktor , Johansen Tom K. , Bach Heinz‐Gunter , Mekonnen Giorgis G. , Yan Lei 
Published: October 2015

AbstractThis article presents a methodology for developing small‐signal behavioral electromagnetic (EM) models of p‐i‐n photodiodes (PDs) for high‐speed applications. The EM model includes RC bandwidth limitation effect and transit‐time effect. The model is capable of accurately modeling arbitrary complex parasitics of PD chips. It can be used to predict the optical‐to‐electrical (O/E) response of PDs with various p‐i‐n junction structures in the frequency domain at the behavioral level. Compared to equivalent circuit models, EM models avoid developing complicated circuit network to represent complex chip parasitics as well as extracting parasitic values and provide straightforward access to EM characteristics of devices. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2530–2533, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26327
Approximation of characteristic parameters for elliptic and circular microshield lines using a robust fuzzy approach
Authors: Sathi Vahid , Ghobadi Changiz , Ehteshami Nasrin 
Published: October 2015

AbstractWe propose a fuzzy learning method by a descent technique, to calculate the characteristic parameters of elliptic‐ and circular‐shaped microshield lines.From input–output data, generated using conformal mapping technique, the inference rules expressing the input output relation of the data are obtained automatically using the proposed fuzzy inference system. The learning speed of this method is substantially higher than that of the neural model. The numerical results are in very good agreement with the results reported elsewhere. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2648–2653, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26335
Broadband shorted‐patch antenna with U‐shaped coupling slot
Authors: Lee Kun‐Joon , Kim Young‐Sik 
Published: October 2015

AbstractA shorted‐patch antenna with a U‐shaped coupling slot for broadband operation is presented.The U‐shaped coupling slot etched on the ground plane is located in close proximity to the shorting wall to obtain a good impedance matching. Using an L‐shaped shorting wall with a height of about 6% wavelength at the center operating frequency and a U‐shaped coupling slot, the proposed microstrip patch antenna has a compact size and broadband operation. The proposed antenna yields a wide bandwidth of about 33.6% and a peak gain of 4.2 dBi. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2566–2569, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26339
A single‐chip 24‐GHz differential I/Q receiver in 0.18‐μm CMOS technology
Authors: Chen Chi‐Chen , Tsou Chuan‐Wei , Lin Yo‐Sheng 
Published: October 2015

AbstractThis article describes a monolithic complementary metal‐oxide‐semiconductor field‐effect‐transistor (CMOS) direct‐conversion receiver (DCR) comprising a low‐noise amplifier, two sub‐harmonic mixers (SHMs), three miniature quadrature couplers (QCs), three miniature baluns, and two intermediate frequency (IF) amplifiers.The SHMs in conjunction with the QCs and baluns are used to eliminate local oscillator (LO) self‐mixing. The circuit was fabricated in a 0.18‐μm CMOS process for 24‐GHz application. At an radio frequency (RF) of 24 GHz and IF frequency of 100 MHz, the DCR dissipates 62.6 mW and exhibits reflection coefficient at RF port smaller than −10 dB for frequencies 10.6∼31.6 GHz, a phase mismatch of 0.22° ∼ 5.18° (the phases of differential in‐phase/quadrature IF outputs are 0°, 95.18°, 176.85°, and 270.22°), a noise figure of 9.1 dB, and a conversion gain of 31.8 dB. In addition, excellent isolations were also achieved. The corresponding LO‐IF, RF‐IF, and LO‐RF isolations are −40, −65.5, and −50.9 dB, respectively, at 24 GHz. The chip area is only 1.6 × 0.67 mm2, i.e., 1.07 mm2, excluding the test pads. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2593–2601, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26351
Rotation—A technique to tune the working frequency of left‐handed materials
Authors: Khan M. F. , Mughal M.J. , Bilal M. 
Published: October 2015

AbstractRotation of left‐handed materials (LHM) is presented as tuning technique in this article. For verification of proposed idea, S‐shaped resonator and its two modified cases are chosen as LHM. The frequency bands of these resonators are determined experimentally with and without rotation. The comparison of results justifies the tuning technique. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2517–2521, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26354
Dipole antenna with folded branch lines for wireless local area network dual band and phase reversal operation
Authors: Jung Jinwoo , Lee Hyeonjin , Lim Yeongseog 
Published: October 2015

AbstractA dipole antenna with folded branch lines with dimensions of 45.16 × 9 × 0.6 mm3 is proposed.The folded branch lines are used for the wireless local area network dual band and phase reversal operations of the antenna. The experimental results indicate that the achieved voltage standing wave ratio (VSWR) 2:1 impedance bandwidths were 313 MHz (2.29–2.603 GHz) and 371 MHz (5.639–6.01 GHz). The measured maximum gains in each operation band were 2.96 and 4.47 dBi, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2449–2451, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26359
Planar loop tag antenna with bandwidth enhancement for UHF RFID system
Authors: Lu Jui‐Han , Su Jr‐Ying 
Published: October 2015

AbstractA novel planar loop tag antenna mounted on the plastic pallets for ultra‐high frequency (UHF) radio frequency identification (RFID) system is proposed. By insetting the U‐shaped slot and a pair of rectangular parasitic strips into the proposed loop tag antenna, the resonant mode close to ultra‐high frequency (UHF) 900‐MHz band is excited to enhance the operating bandwidth. The obtained impedance bandwidth across the operating band can reach about 174 MHz (18.8%) for UHF band. Also, with bidirectional pattern, the measured reading distance is about 2.0 m as the proposed loop tag antenna mounted on the plastic pallets. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2711–2713, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26361
CMOS quadrature VCO using the injection MOSFET coupling
Authors: Jang Sheng‐Lyang , Chiu Yao‐Ting , Chang Chia‐Wei , Hsue Ching‐Wen 
Published: October 2015

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 gates of the MOS transistors on the other ILO and vice versa so as to force the two local oscillator (LOs) operate in quadrature. The injection metal‐oxide‐semiconductor field‐effect transistors (MOSFETs) are also used as frequency tuning varactors. The QVCO has been implemented with the Taiwan Semiconductor Manufacture Company (TSMC) 0.18 μm complementary metal‐oxide‐semiconductor (CMOS) technology and the die area is 0.646 mm × 0.841 mm. At the supply voltage of 1.3 V, the total power consumption is 9.58 mW. The free‐running frequency is tunable from 5.44 to 5.95 GHz as the tuning voltage is varied from 0.2 to 2.0 V. The measured phase noise at 1 MHz offset is −121.52 dBc/Hz at the oscillation frequency of 5.91 GHz and the figure of merit (FOM) of the proposed QVCO is about −187.14 dBc/Hz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2631–2634, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26363
High Isolation Microstrip Diplexer with Enhanced Stopband Characteristics for GSM and WLAN Application
Authors: Zhou Yong‐gang , Deng Honge‐wei , Zhao Yong‐jiu 
Published: October 2015

ABSTRACTIn this article, a high‐isolation microstrip diplexer with enhanced stopband characteristics is presented for GSM and Wireless Local Area Network (WLAN) application. The proposed diplexer consists of two compact bandpass filters (BPFs) using short‐circuit centered stepped impedance resonators (SCSIRs), operated at 1.8 and 2.45 GHz, respectively. Due to the intrinsic characteristics of the SCSIRs, multiple transmission zeros can be generated for high selectivity and wide upper‐stopband. By locating the transmission zero of one channel at the passband of the other channel, and utilizing good impedance matching between two BPFs, high output isolation can be achieved. A microstrip diplexer prototype is designed and fabricated. The upper‐stopband of two channels in experiment is extended up to 10.2 GHz with an insertion loss larger than 28 dB. Meanwhile, the measured isolation greater than 48 dB in GSM passband and more than 52 dB in WLAN passband is achieved between two channels. A satisfactory agreement between the simulated and measured results validates the proposed configuration. The size without the 50‐Ω feed lines is only
in which
is the guided wavelength at 1.8 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2990–2993, 2013
UWB BPF with Triple Notched Bands using Interdigital Coupled‐Line and Three QWR Coupling Short Stubs
Authors: Deng Hong‐Wei , Zhao Yong‐Jiu , Fu Yong , He Ying , Zhang Lu 
Published: October 2015

ABSTRACTIn this article, a compact ultrawideband microstrip bandpass filter with triple narrow notched bands and wide stopband is proposed utilizing interdigital coupled‐line and three quarter‐wavelength resonator (QWR) coupling short stubs loaded in the 50‐Ω feedlines. The short stubs can improve the passband performance and create new transmission zeros in the upper‐stopband. The coupling QWR is studied and used to generate the desired notched band and deepen the stopband. By simply adjusting the dimensions of the QWRs, the center frequencies of the notched bands can be allocated at 3.6, 5.2, and 5.8 GHz, respectively. Good insertion/return losses and wide stopband are achieved as demonstrated in both simulation and experiment. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2874–2876, 2013
Bandwidth enhancement of a wearable UWB antenna near a human arm
Authors: Koohestani Mohsen , Pires Nuno , Skrivervik Anja K. , Moreira Antonio A. 
Published: October 2015

ABSTRACTA dielectric sandwich loading technique is proposed to enhance impedance matching bandwidth of an antenna when it is placed close to the human body. This technique mitigates the body influence by confining the reactive fields in the dielectric loads. This has no side effects on the antenna performance. Unloaded and loaded prototypes of a recently developed UWB antenna have been measured both in free space and near a human arm. Free space results confirm that loading the antenna neither detune |S11| nor decrease efficiency. It was found that in a body proximity scenario, loading the antenna increases the impedance matching by 22% with respect to the unloaded antenna. These results show the suitability of this technique to design antennas for WBAN applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2965–2967, 2013
Radio Frequency U‐Shape Slot Antenna Design with Niti Shape Memory Alloys
Authors: Kaya Adnan , Kaya Irfan , Karaca Haluk E. 
Published: October 2015

ABSTRACTIn this article, a novel instruments, scientific, measurements (ISM) band antenna which includes NiTi shape memory alloy is proposed and its return loss, impedance bandwidth, and gain performance are analyzed. A NiTi‐based U‐shape antenna operating at 2.4 GHz having 12.3% bandwidth has been utilized as a reference antenna. The 10‐dB return loss bandwidth of the proposed antenna is found to be 12.3%, which covers the recently proposed communication applications. In addition, it has been shown that NiTi antenna improves the radiation pattern. The gain of the NiTi antenna is higher than 6 dBi. An accurate electromagnetic model of the NiTi antenna is developed. The computed and measured results showed good agreement for copper, aluminum, and NiTi antennas. The NiTi‐based antenna shows stable gain and radiation patterns over the frequency range of 2–3 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2976–2984, 2013
Implementing Long Reach WDM‐PON Delivering Downstream Data 2 Gbps and Upstream Data 70 Gbps on a Single Wavelength using Soliton Pulse
Authors: Tawade Laxman 
Published: October 2015

ABSTRACTThis article presents Long Reach Wavelength Division Multiplexing Passive Optical Network (WDM‐PON) system capable of delivering downstream 2 Gbit/s data and upstream 70 Gbit/s data on a single wavelength using pulse source which is mode locked laser that generates a single pulse of “sech” shape with specified power and width. That is, soliton pulse. The optical source for downstream data and upstream data is sech pulse generator at central office (CO) and reflective semiconductor optical amplifier (RSOA) at each optical network unit (ONU). We use two RSOAs at each ONU for the 70‐Gb/s upstream transmission. The operating wavelengths of these RSOAs are separated by the free‐spectral range of the cyclic arrayed waveguide gratings used at the CO and remote node (RN) for (de)multiplexing the WDM channels. We extend the maximum reach of this WDM PON to be 123 km by using Erbium‐doped fiber amplifiers at the RN. The results show that the error‐free transmission can be achieved for all WDM channels in the wavelength range of >35 nm with sufficient power margins. We also investigate analysis of backscattered optical signal for upstream data and downstream data simultaneously. Bit error rate, were measured to demonstrate the proposed scheme. In this article, Long reach and large data service aspects of a WDM‐PON is presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2853–2859, 2013