bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compact MM‐wave CMOS distributed amplifier using series‐peaking line and M‐derived section
Authors: Lee Iljin , Yoon Sangwoo , Rieh Jae‐Sung , Jeon Sanggeun 
Published: February 2015

ABSTRACTAn mm‐wave distributed amplifier (DA) with high gain‐bandwidth (GBW) product and small chip area is implemented in a 65‐nm CMOS process. The DA consists of five cascode unit cells for high gain and isolation. To achieve a wide bandwidth, a series‐peaking line and an m‐derived section are inserted at the interstage and output networks, respectively, of each cascode unit cell. The transistor size is optimized for compromising the tradeoff between gain and bandwidth. For compact layout, all matching sections and lines are implemented using the microstrip structure. The DA exhibits a measured gain of 8.2 dB and a 3‐dB bandwidth of 65 GHz, thus reaching a GBW of 163 GHz. The return loss at the input and output are both more than 13 dB over the entire bandwidth. Due to compact layout, the chip occupies only 0.5 mm2. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:814–817, 2015
Ultracompact Si slot waveguide‐based polarization rotators
Authors: Tran Thang Q. , Kim Sangin 
Published: February 2015

ABSTRACTA novel silicon asymmetric tilted slot waveguide‐based polarization rotator is presented. A large birefringence in the silicon slot waveguide facilitated a compact polarization rotator of subwavelength scale. A 1287 nm long TM to TE and TE to TM polarization rotator was achieved with an extinction ratio of 10 dB and an insertion loss of less than 5 dB at an operating wavelength of 1500 nm. Further performance improvement is possible for polarization rotator designed to work on TM to TE (or TE to TM) conversion: a 711 nm long TM to TE polarization rotator with 9.25 dB extinction ratio and 2.2dB insertion loss was also numerically demonstrated. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:779–785, 2015
Compact polarization diversity ultrawideband mimo antenna with triple band‐notched characteristics
Authors: Huang He , Liu Ying , Zhang Shao‐Shuai , Gong Shu‐Xi 
Published: February 2015

ABSTRACTA compact ultrawideband (UWB) antenna with three notch bands for polarization diversity applications is proposed in this article. Composed of two identical monopoles which can easily get UWB operation, the antenna delivers polarization diversity operation by placing the two monopoles vertical to each other, and high isolation is obtained without using any extra decoupling structures. Three notch bands aiming to avoid interference to the UWB system are realized by two different types of resonators. Furthermore, a four‐element UWB MIMO antenna is also presented. Both of them have great performance, making themselves good candidates for promising wireless polarization diversity communication systems. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:946–953, 2015
Corner truncated broadband patch antenna with circular slots
Authors: Baudha Sudeep , Dinesh Kumar Vishwakarma 
Published: February 2015

ABSTRACTIn this communication, a corner truncated broadband patch antenna with circular slots is presented. The proposed antenna is fabricated on 14 * 14 * 1.57 mm3 Rogers RT5870 substrate (εr = 2.33 and loss tangent of 0.0012) and a 50‐Ω SMA connector is used for excitation. Bandwidth enhancement has been reported due to cutting of two circular slots and truncating the corners of the square patch, which gives rise to mode splitting phenomenon and better impedance matching. Simulated results show that the impedance bandwidth (S11 < 10 dB) of the proposed antenna is 19% (10.8–13.2 GHz). Measured results are in good agreement with the simulated results. The fractional bandwidth of the proposed antenna has enhanced from 8.5 to 19% as compared to the simple patch antenna, showing an enhancement of 123%. The peak gain of the proposed antenna is 7 dB. The antenna finds application in satellite communication, radar communication, and other alleged wireless communication services. Details and comparison of the proposed antenna with simple patch antenna have been described. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:845–849, 2015
500 MBIT/s OOK‐NRZ transceiver for 50 m GI‐POF using 100 MHz RC‐led
Authors: Binh Phi H. , Trong Vo D. 
Published: February 2015

ABSTRACTA high‐speed fiber optic transceiver using 650 nm resonant‐cavity light‐emitting diode (RC‐LED) and silicon pin photodiode for polymer optical fiber (POF) systems is presented. The transmitter exploits peaking and carrier sweep‐out effects to improve on‐off keying modulation rate of 100 MHz bandwidth RC‐LEDs by over 250%. An error‐free data transmission over 50 m graded‐index POF is demonstrated at 500 Mbit/s data rate. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:826–830, 2015
A 7.3 mWW‐band double‐balanced up‐conversion mixer with 7.3 dB conversion gain and 65.5 dB LO‐RF isolation in 90 nm CMOS technology
Authors: Lin Yo‐Sheng , Liu Run‐Chi 
Published: February 2015

ABSTRACTA W‐band double‐balanced mixer for direct up‐conversion using standard 90 nm CMOS technology is reported. The mixer comprises an enhanced double‐balanced Gilbert cell with PMOS negative resistance compensation for conversion gain (CG) enhancement and current injection for power consumption reduction and linearity improvement, a Marchand balun for converting the single local oscillator (LO) input signal to differential signal, another Marchand balun for converting the differential RF output signal to single signal, and an output buffer amplifier for loading effect reduction and CG enhancement. The mixer consumes low power of 7.3 mW and achieves intermediate frequency‐port input reflection coefficient (S11) smaller than −8.8 dB for frequencies lower than 3 GHz, and LO‐port input reflection coefficient (S22) of −8.8∼ −23.9 dB and RF‐port input reflection coefficient (S33) of −11.2 to −22.4 dB for frequencies of 70–90 GHz. For RF frequencies of 77–81 GHz, the mixer achieves CG of 5.2–7.3 dB and LO‐RF isolation of 62.3–65.5 dB, the best CG and isolation results ever reported for a W‐band CMOS/BiCMOS up‐conversion mixer. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:879–886, 2015
Forbidden regions of L‐section impedance matching networks on Meta‐Smith charts for conjugately characteristic‐impedance transmission lines
Authors: Torrungrueng Danai , Mekathikom Theeraputh 
Published: February 2015

ABSTRACTIn this article, the ZY Meta‐Smith chart (MSC) is applied to intuitively determine a forbidden region for all eight L‐section matching networks associated with conjugately characteristic‐impedance transmission lines (CCITLs) with nonnegative characteristic resistances (NNCRs), where a load impedance cannot be matched to a CCITL. Due to the fact that the ZY MSC for CCITLs with NNCRs depends on the argument ϕ of the characteristic impedances
of CCITLs (which can be negative, zero, or positive), three cases for each L‐section matching network are considered to determine the effect of the argument ϕ on forbidden regions, resulting in a total of 24 cases for all L‐section matching networks. It is found that the ZY MSC for CCITLs with NNCRs is indeed a useful graphical tool for enabling intuition for radio‐frequency engineers with additional physical insight into impedance matching of L‐section matching networks. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:874–879, 2015
Design of X‐band power amplifier for leo satellite transmitter
Authors: Mansour Islam , Elhennawy Hadia , Tag El‐Dien Adly S. 
Published: February 2015

ABSTRACTThe design of a three‐stage X‐band power amplifier (PA) is presented in this article. The amplifier is realized using an ATF‐38143 low noise PHEMT FET. The proposed PA achieves 17–18.3 dB power gain, a good input matching (S11 < −8 dB) and a good output matching (S22 < −10 dB). The average power added efficiency when the input power 5 dBm is 50% over the 4‐GHz bandwidth (from 8 to 12 GHz). The total power consumption of the PA is 0.24 W from 2.5 V supply voltage. Its performance was simulated using Agilent EEs of ADS simulator. The PA is fabricated with photolithographic technique and scattering parameters are measured using Agilent Vector Network Analyzer ES1978. Measurements and simulations show good agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:860–865, 2015
Novel design of reconfigurable microstrip slot antenna with switchable band‐notched characteristic
Authors: Ojaroudi Sajjad , Ojaroudi Yasser , Ojaroudi Nasser 
Published: February 2015

ABSTRACTIn this article, a kind of reconfigurable slot antenna with multiresonance and switchable band‐notched functions is designed and manufactured whose frequency characteristics can be reconfigured electronically to has a band‐notched function to block interfering signals 5–6 GHz wireless local area network (WLAN). In the proposed design, by using a pair of protruded arrow‐shaped strips inside an extra rectangular slot in the ground plane, additional resonance is excited and hence much wider impedance bandwidth can be produced, especially at the higher band which provides a wide usable fractional bandwidth of more than 135%. Using these modified structures, the usable upper frequency of the antenna is extended from 8.6 to 13.7 GHz. To generate a reconfigurable band‐stop performance, we use a PIN diode within the inserted triangular‐shaped slot in the modified radiating stub. By changing the ON/OFF conditions of the PIN diode, the antenna can be used to generate a switchable band‐notched characteristic. It will help to minimize the interference between the UWB and WLAN systems and whenever there is no coexistence system, the structure of the antenna can be transformed in a way that leads to a whole coverage of UWB spectrum. The antenna exhibits good radiation behavior within the UWB frequency range. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:849–853, 2015
Electrically small printed antenna for applications on cubesat and nano‐satellite platforms
Authors: Volkan A. K. A. N. 
Published: February 2015

ABSTRACTA very compact circularly polarized antenna to be utilized readily on nanosatellite and CubeSat platforms is presented. Nanosatellite and CubeSats have very limited volume and surfaces bringing a physical size constraint on the components and antennas which should also be as functional as their counterparts used in similar terrestrial systems. The proposed structure is a cavity‐backed antenna with tapered crossed‐slot aperture. The antenna is a low‐profile compared to wavelength, circularly polarized and wide‐band with respect to conventional high‐Q printed antennas. Two different designs to operate at 2.44 GHz are implemented on two different substrates, occupying a footprint of 38 mm × 38 mm and 30 mm × 30 mm. Their measured percentage impedance bandwidths are 2% and 1.68%, respectively. The obtained maximum gain is about 5 dBic around the target frequency. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:891–896, 2015
Multiband antenna for portable device applications
Authors: Honarvar M. Amin , Hamidi Naeemehsadat , Virdee Bal S. 
Published: February 2015

ABSTRACTThis article describes a compact planar microstrip antenna for multiband transceiver application. The proposed antenna consists of a combination of E‐shaped and C‐shaped radiators that are excited via a common microstrip feed‐line. Embedded in the ground‐plane are included an open‐ and short‐ended slots whose purpose is to enhance the antenna's impedance match and increase the number of bands in which the antenna can operate. A prototype antenna was fabricated on a standard FR4 substrate with εr of 4.4 and thickness of 1.6 mm, and its reflection‐coefficient and radiation patterns were measured to demonstrate its feasibility. Measurements confirm the antenna can simultaneously operate over the frequency bands of: DCS (1.71–1.85 GHz), PCS (1.85–1.99 GHz), UMTS (1.92–2.17 GHz), Wibro (2.3–2.39 GHz), WLAN+ Bluetooth (2.4–2.48 MHz), WIMAX (2.5–2.69 GHz), WIMAX (3.3–3.5 GHz), HIPERLAN2 (5.15–5.35/5.47–5.725 GHz), and WLAN (5.15–5.35/5.725–5.825 GHz). The antenna has dimensions of 30 × 40 × 1.6 mm3, which is compatible with the requirements imposed by portable wireless systems. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:956–959, 2015
Design of dual‐band gan doherty power amplifier using a simplified structure
Authors: Shao Jin , Zhou Rongguo , Yoon Sang‐Woong , Fu Song , Kim Hyoungsoo , Zhang Hualiang 
Published: February 2015

ABSTRACTIn this article, we present a simplified Doherty power amplifier (DPA) architecture for the easy implementation of dual‐band operation. The proposed DPA structure eliminates the 35 Ω quarter wavelength impedance inverters used in the conventional DPAs by matching the output impedances of the carrier and peak amplifiers of the DPA to other values (e.g., 100 Ω). The electrical lengths of the offset line and the phase compensation line are carefully chosen to enhance the Doherty effect (high efficiency at back‐off power level) at two assigned frequency bands. Broadband matching networks are also designed to increase the operation bandwidths at the two designed bands. To prove the design concept, a dual‐band DPA is designed and measured. In the first frequency band (550–650 MHz), the designed DPA provides 60.6–76.3% drain efficiency (DE) at full output power, 46–54.9% DE at 6 dB of output power back‐off (OBO); in the second frequency band (950–1050 MHz), the designed DPA provides 51.4–61.2% DE at full output power, 35–38% DE at 6 dB of OBO. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:953–956, 2015
Traumatism in the Wild Animals Kept and Offered at Predynastic Hierakonpolis, Upper Egypt
Authors: Van Neer W. , Udrescu M. , Linseele V. , De Cupere B. , Friedman R. 
Published: February 2015

AbstractA description is given of the violence‐related pathologies that are observed in a number of wild mammals that were buried in the predynastic cemetery HK6 at Hierakonpolis, Upper Egypt. Unlike other predynastic graveyards, where only domestic cattle, sheep, goat and dogs are interred, the elite cemetery HK6 yielded also a wide variety of wild species that were buried as part of extensive mortuary complexes surrounding the graves of the highest local elite. The animals were interred, singly or in groups, often in graves of their own, but some also accompany human burials. Pathologies were found on the skeletons of 20 of the 38 wild animals discovered thus far, namely 15 anubis baboons (Papio anubis), one leopard (Panthera pardus), one jungle cat (Felis chaus), one hartebeest (Alcelaphus buselaphus), one aurochs (Bos primigenius) and one hippo (Hippopotamus amphibius). Most of the pathologies are healed fractures resulting from violent blows, and a smaller proportion seems to be related to tethering. These conditions indicate that the animals were held in captivity for a prolonged period of time after their capture. The type and frequency of the encountered deformations differ from those seen in wild animals from other, more recent Egyptian cemeteries (Abydos, Tuna el‐Gebel, Gabanet el‐Girou and Saqqara) where mainly metabolic disorders are observed that have been attributed to chronic malnutrition and vitamin D deficiency as a result of inadequate housing in a dark environment. Copyright © 2015 John Wiley & Sons, Ltd.
IRAK4 gene polymorphism and odontogenic maxillary sinusitis
Authors: Pereira Inês Guerra , Vaz Paula , Almeida Ricardo Faria , Braga Ana Cristina , Felino António 
Published: February 2015

Abstract

Objectives
This study aimed to evaluate whether a specific interleukin-1 receptor-associated kinase-4 (IRAK4) gene polymorphism had any influence on the development of changes in maxillary sinus, particularly in the presence of etiological factors of dental origin.

Materials and methods
The study population included 153 Portuguese Caucasians that were selected from a database of 504 retrospectively analysed computed tomography (CT) scans. A genetic test was performed, and a model was created through logistic analysis and regression coefficients. The statistical methodologies included were the independent Chi test, Fisher’s exact test, binary logistic regression and the receiver operating characteristic (ROC) curve.

Results
The estimated prevalence of IRAK4 gene polymorphism found in a Portuguese Caucasian population was 26.8 % (CI 95 %) [20.1, 34.7 %]. A model to predict the inflammatory response in the maxillary sinus in the presence etiological factors of dental origin was constructed. This model had the following as variables: previously diagnosed sinusitis, sinus pressure symptoms, cortical bone loss observed on CT, positive genetic test result and radiographic examination that revealed the roots of the teeth communication with the maxillary sinus, which are interpreted as risk factors.

Conclusions
The constructed model should be considered an initial clinical tool. The area under the ROC curve found, AUC = 0.91, revealed that the model correctly predicts the outcome in 91.1 % of cases.

Clinical relevance
The clinical relevance of this study lies in trying to achieve a potential tool (a model) that may assist the clinician in the implementation of suitable dental treatment plans in complex cases, with probable involvement of the maxillary sinus.
Thermal Oxidation Analysis of Forage Turnip (Raphanus sativus L. var. oleiferus Metzg.) Oil
Authors: Oliveira Ivan Pires , Souza Augusto Ferreira , Lescano Caroline Honaiser , Caires Anderson Rodrigues Lima , Muzzi Rozanna Marques 
Published: February 2015

AbstractIn this work, the composition of fatty acids and the oxidative stability of the oil from Raphanus sativus L. var. oleiferus Metzg. are presented and analyzed with the Rancimat method, and by absorption and molecular fluorescence spectroscopy. The gas chromatography showed that the content of unsaturated fatty acids was 90.27 ± 6.10 %, with a predominance of oleic (C 18:1), linoleic (C 18:2), erucic (C 22:1), linolenic (C 18:3) and eicosenoic (C 20:1) acids. The induction period determined by the Rancimat method was 48.0 ± 1.0 h. In addition, the thermal degradation of the oil was monitored through its acid value, density, UV–Vis absorption and molecular fluorescence, and here we show the potential applicability of emission spectroscopy for R. sativus oil oxidation studies.
Web Resources for Mass Spectrometry-Based Proteomics
Authors: Chen Tao , Zhao Jie , Ma Jie , Zhu Yunping 
Published: February 2015

Abstract
With the development of high-resolution and high-throughput mass spectrometry (MS) technology, a large quantum of proteomic data is continually being generated. Collecting and sharing these data are a challenge that requires immense and sustained human effort. In this report, we provide a classification of important web resources for MS-based proteomics and present rating of these web resources, based on whether raw data are stored, whether data submission is supported, and whether data analysis pipelines are provided. These web resources are important for biologists involved in proteomics research.
Whose fault is it? Effects of relational self‐views and outcome counterfactuals on self‐serving attribution biases following brand policy changes
Authors: Wiggin Kyra L. , Yalch Richard F. 
Published: February 2015

AbstractMany consumers view their relationships with brands as part of their identity and this affects how they react to a brand's behavior that negatively impacts them. In assigning responsibility for negative outcomes, individuals often demonstrate a self‐serving bias by assigning more responsibility to their partner and less to themselves. In three studies, we demonstrate that this tendency is resisted among consumers holding a strong relational self‐view. However, their self‐serving bias emerges when the outcome represents a near‐miss situation in which a more favorable counterfactual alternative outcome was highly possible. This change in attributions is associated with increased feelings of being betrayed and perceived unfairness by the brand even though its actions are identical in the near‐miss and far‐miss situations.
Inquisition Records from Goa as Sources for the Study of Slavery in the Eastern Domains of the Portuguese Empire
Authors: Hassell Stephanie 
Published: February 2015

AbstractGoan inquisition case summaries from the sixteenth and seventeenth centuries provide invaluable information about African and Asian slaves in the Estado da Índia, the eastern domains of the Portuguese Empire stretching from southern Africa to China. As most of the full trial records have been destroyed, the case summaries fill a crucial gap. The summaries also provide context for extant Goan trials. This article discusses the methodological challenges of using these records.
Flow regimes for fluid injection into a confined porous medium
Authors: Zheng Zhong , Guo Bo , Christov Ivan C. , Celia Michael A. , Stone Howard A. 
Published: February 2015

AbstractWe report theoretical and numerical studies of the flow behaviour when a fluid is injected into a confined porous medium saturated with another fluid of different density and viscosity. For a two-dimensional configuration with point source injection, a nonlinear convection–diffusion equation is derived to describe the time evolution of the fluid–fluid interface. In the early time period, the fluid motion is mainly driven by the buoyancy force and the governing equation is reduced to a nonlinear diffusion equation with a well-known self-similar solution. In the late time period, the fluid flow is mainly driven by the injection, and the governing equation is approximated by a nonlinear hyperbolic equation that determines the global spreading rate; a shock solution is obtained when the injected fluid is more viscous than the displaced fluid, whereas a rarefaction wave solution is found when the injected fluid is less viscous. In the late time period, we also obtain analytical solutions including the diffusive term associated with the buoyancy effects (for an injected fluid with a viscosity higher than or equal to that of the displaced fluid), which provide the structure of the moving front. Numerical simulations of the convection–diffusion equation are performed; the various analytical solutions are verified as appropriate asymptotic limits, and the transition processes between the individual limits are demonstrated. The flow behaviour is summarized in a diagram with five distinct dynamical regimes: a nonlinear diffusion regime, a transition regime, a travelling wave regime, an equal-viscosity regime, and a rarefaction regime.