bluuebunny/crossref_metadata_2025_split huggingface dataset:
Interference mitigation and D2D parameter estimation for distributed‐control D2D underlay systems
Authors: Rim Minjoong , Chae Seungyeob , Kang Chung G. 
Published: February 2015

AbstractAlthough centralised‐control schemes for device‐to‐device (D2D) underlay communications can produce satisfactory results by efficiently managing the interference between cellular and D2D transmissions, they can become prohibitively complicated and may require a large amount of feedbacks from devices, because it is important to handle the inter‐cell interference as well as the intra‐cell interference. Such a burden can be alleviated by a distributed‐control mechanism, in which a base station performs the resource management of its cellular devices and each D2D device selects its own resource without a small‐scale control of the cellular network. This paper addresses interference issues in distributed‐control D2D underlay systems and presents an interference mitigation technique based on frequency spreading, in order to meet the target outage probability. This paper also proposes a simple estimation scheme, which can be used for the mode selection and the determination of D2D transmission parameters. Copyright © 2015 John Wiley & Sons, Ltd.
Evaporation of perennial semi‐arid woodland in southeastern Australia is adapted for irregular but common dry periods
Authors: Meyer W. S. , Kondrlovà E. , Koerber G. R. 
Published: February 2015

AbstractMeasurements of water vapour flux from semi‐arid perennial woodland (mallee) were made for 3 years using eddy covariance instrumentation. There have been no previous long‐term, detailed measures of water use in this ecosystem. Latent energy flux (LE) on a half hourly basis was the measure of the combined soil and plant evaporation, ‘evapotranspiration’ (ELE) of the site. Aggregation over 3 years of the site measured rain (1136 mm) and the estimated evaporation (794 mm) suggests that 342 mm or 30% of rain had moved into or past the root zone of the vegetation. Above average rainfall during 2011 and the first quarter of 2012 (633 mm, 15 months) would likely have been the period during which significant groundwater recharge occurred. At times immediately after rainfall, ELE rates were the same or exceeded estimates of potential E calculated from a suitably parameterized Penman–Monteith (EPMo) equation. Apparent free water E from plant interception and soil evaporation was about 2.3 mm and lasted for 1.3 days following rainfall in summer, while in autumn, E was 5.1 mm that lasted over 5.4 days. The leaf area index (LAI) needed to adjust a wind function calibrated Penman equation (EPMe) to match the ELE values could be back calculated to generate seasonal change in LAI from 0.12 to 0.46 and compared well with normalized difference vegetation index; r = 0.38 and p = 0.0213* and LAI calculated from digital cover photography. The apparently conservative response of perennial vegetation evaporation to available water in these semi‐arid environments reinforces the conclusion that these ecosystems use this mechanism to survive the reasonably common dry periods. Plant response to soil water availability is primarily through gradual changes in leaf area. Copyright © 2015 John Wiley & Sons, Ltd.
Response of maize (Zea mays) to the application of foliar fertilizers in the Sudan and Guinea savanna zone of Nigeria
Authors: Jemo Martin , Nwoke Chike , Pypers Pieter , Vanlauwe Bernard 
Published: February 2015

AbstractSoil fertility problems resulting in low maize yields in smallholder farms are common in the West African moist savanna. The effectiveness of commercial foliar fertilizers in improving maize growth and yield was evaluated in three savanna agro‐ecological zones of Nigeria in two steps. In step one, eight commercial foliar fertilizers were assessed in a greenhouse study with two soil types using maize (Zea mays L. cv. 2004 TZE‐Y POPDT STR C4). The treatments included a control and a reference that received the optimum concentrations of nutrients. In step 2, three promising products from the greenhouse study (Turbotop, Agroleaf General, and Agroleaf high‐P) were evaluated under field conditions to validate the efficacy of products to enhance crop growth and yield. The foliar products were applied at the rate of 5 kg ha−1. The treatments also included three rates of P application (0, 30, and 60 kg P ha−1) as triple super phosphate (TSP) with or without foliar fertilizers. In the greenhouse study, differences in maize shoot dry matter yield and N and P concentrations, attributable to the spraying of the commercial foliar fertilizers, were observed for both soils. Spraying Turbotop, Agroleaf General, and Agroleaf high‐P gave the highest shoot dry biomass and N and P uptake compared to other products. Under field conditions, foliar spraying of Agroleaf high‐P significantly increased the shoot dry biomass of maize compared with the 0 P treatment in all locations. The grain yield of maize ranged from 1 to 4 t ha−1 with significant differences across sites. Products with high concentrations of P and N in their formulation improved maize yield suggesting that appropriate management of P and N resources is a prerequisite for a sustainable maize intensification in the savanna agro‐ecologies.
Reducing margins of wide local excision in head and neck melanoma for function and cosmesis: 5‐year local recurrence‐free survival
Authors: Rawlani Roshni , Rawlani Vinay , Qureshi Hannan A. , Kim John YS. , Wayne Jeffrey D. 
Published: February 2015

BackgroundThe proximity of head and neck (H&N) melanomas to critical anatomical structures requires that surgeons achieve a balance between adequate margins of excision and the functional and cosmetic needs of patients. This study sought to determine the risk associated with reducing margins of wide local excision (WLE) in H&N melanoma and to identify risk factors of recurrence.MethodsSeventy‐nine cases of primary, invasive H&N melanoma were treated by WLE and followed prospectively for local recurrence. Forty‐two WLEs were performed according to current practice guidelines (1cm for lesions<1.0 mm thick, 1–2 cm for lesions 1.01–2.0 mm thick, and 2 cm for lesions >2.0 mm thick). Reduced margins (0.5 cm for lesions ≤1.0 mm thick, 0.5–1.0 cm for lesions 1.01–2.0 mm thick, and 1.0 cm for lesion >2.0 mm thick) were utilized in 37 cases to preserve critical anatomical structures such as the eyelid, nose, mouth and auricle.ResultsOverall local recurrence rate was 8.9% over a mean follow‐up period of 71.3 months and a minimum of 60 months. Reducing margins of WLE did not increase local recurrence rates as demonstrated by local recurrence‐free survival (90.4% vs. 91.9%, P = 0.806).ConclusionMargins of WLE may be safely reduced in melanomas in close proximity to structures of the H&N without affecting local recurrence rates. J. Surg. Oncol. 2015 111:795–799. © 2014 Wiley Periodicals, Inc.
Comparing oncological outcomes of laparoscopic versus open surgery for colon cancer: Analysis of a large prospective clinical database
Authors: Sammour T. , Jones Ian T. , Gibbs P. , Chandra R. , Steel Malcolm C. , Shedda Susan M. , Croxford M. , Faragher I. , Hayes Ian P. , Hastie Ian A. 
Published: February 2015

BackgroundOncological outcomes of laparoscopic colon cancer surgery have been shown to be equivalent to those of open surgery, but only in the setting of randomized controlled trials on highly selected patients. The aim of this study is to investigate whether this finding is generalizable to real world practice.MethodsAnalysis of prospectively collected data from the BioGrid Australia database was undertaken. Overall and cancer specific survival rates were compared with cox regression analysis controlling for the confounders of age, sex, BMI, ASA score, hospital site, year surgery performed, procedure, tumor stage, and adjuvant chemotherapy.ResultsBetween 2003 and 2009, 1,106 patients underwent elective colon cancer resection. There were differences between the laparoscopic and open cohorts in BMI, procedure, post‐operative complication rate, and tumor stage. When baseline confounders were accounted for using cox regression analysis, there was no difference in 5 year overall survival (χ2 test 1.302, P = 0.254), or cancer specific survival (χ2 test 0.028, P = 0.866).ConclusionThis large prospective clinical study validates previous trial results, and confirms that there is no difference in oncological outcome between laparoscopic and open surgery for colon cancer. J. Surg. Oncol. 2015 111:891–898. © 2014 Wiley Periodicals, Inc.
“A disorder which occurs on standing”: The Earliest Account of Orthostatic Tremor by Pazzaglia
Authors: Erro Roberto , Antelmi Elena , Bhatia Kailash P. 
Published: February 2015

AbstractThe earliest account of orthostatic tremor (OT) dates back to 1970, when Pazzaglia and colleagues reported on three patients with a peculiar disorder only occurring on standing. Although Pazzaglia et al. did not use the term OT, they first provided both the clinical and neurophysiological features of such a condition.
A compact ultraminiature coaxial fed antenna for WMTS biotelemetry applications
Authors: Ung Johnny , Karacolak Tutku 
Published: February 2015

ABSTRACTThe primary objective of this study is to present a compact wideband implantable antenna operating in the wireless medical telemetry service (1395–1400 MHz, 1427–1432 MHz) bands. The proposed antenna has a compact size with dimensions of 8.7 mm × 5.05 mm × 1.27 mm. The simulated and measured −10 dB bandwidths are found to be 28% and 19%, respectively. The antenna is in vitro tested in a tissue mimicking solution approximating the electrical properties of human skin tissue. Results are compared with simulations. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:987–992, 2015
A novel vivaldi antenna with extended ground plane stubs for ultrawideband applications
Authors: Wu Jiangniu , Zhao Zhiqin , Liu Qing‐Huo 
Published: February 2015

ABSTRACTIn this letter, a compact printed Vivaldi antenna with two symmetrical extended ground plane stubs is presented. By extending the stubs from the ground plane, the low‐end bandwidth limitation of the antenna is extended to low frequencies and then the bandwidth is enlarged. To validate the proposed design, an antenna prototype is fabricated and tested. The measured results confirm that the modification presented in this letter is very effective without changing the overall dimensions of the antenna. The measured impedance bandwidth defined by S11 < −10 dB is from 2.45 to 15.2 GHz with a ratio of about 6.2:1. The measured gain is better than 4.2 dBi within the operating frequency band. In addition, a nearly constant group time delay is also achieved across the band of 2.4–16 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:983–987, 2015
Small‐size dual‐wideband monopole antenna with inductive and capacitive feeding branches for long term evolution tablet computer application
Authors: Wong Kin‐Lu , Liao Zih‐Guang 
Published: February 2015

ABSTRACTA small‐size dual‐wideband monopole antenna for the long term evolution (LTE) operation in the tablet computer is presented. The antenna occupies a small ground clearance of 10 × 30 mm2 and is easy to implement by feeding a simple radiating portion through an inductive branch (inductor‐loaded branch) and a capacitive branch (capacitor‐loaded branch). The inductive branch mainly generates the antenna's lower band and leads to decreased resonant size for the antenna, while the capacitive branch is mainly for generating the antenna's higher band. By further aided by a simple matching network, both the antenna's lower and higher bands can have enhanced bandwidths. In this study, the antenna not only occupies a small ground clearance but also has a thin thickness of 3 mm only, and the obtained bandwidths can cover two wide bands of 698–960 and 1710–2690 MHz for the LTE operation. Details of the proposed antenna are presented. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:853–860, 2015
Mimo circular polarization array antenna with dual coupled 90° phased shift for point‐to‐point application
Authors: Nayan Mohd Khairul Azhar , Jamlos Mohd Faizal , Jamlos M. A. 
Published: February 2015

ABSTRACTThis article presented a circle‐segmented multiple‐input‐multiple‐output (MIMO) circular polarization (CP) array antenna with dual coupled 90° phased shift for 5.8 GHz Point‐to‐Point application. Convergence of CP capability within MIMO array antenna is successfully realized by two array of four circular‐segmented patch array radiating element that are fed by two RF ports. The MIMO CP array antenna with high gain performance is obtained through the dual coupled 90° phased shift that is connected to each circle‐segmented patch. The dual coupled 90° phased shift ensure the E‐field of circle‐segmented patches function is in 90° phase difference to the initial signals. Similarity between azimuth and elevation plane with axial ratio of 1.9 dB verified the proposed antenna's CP capability. In the mean time, correlation coefficient (ρ) of 1.2015 e − 4, diversity gain (Gapp) of 9.9999, S21 of −45.1 dB show the good isolation quality of the antenna in MIMO structure. The gain of 14.6 dB for each port is also recorded. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:809–814, 2015
Dual band antenna designing with composite right/left handed
Authors: Zarrabi Ferdows B. , Ahmadian Rahele , Rahimi Maryam , Mansouri Zahra 
Published: February 2015

ABSTRACTIn this article, dual band antenna by implementation of composite right/left‐handed for UWB and WLAN application is presented with L shape ground. First antenna, has two resonances at 1.8 and 5.2 GHz for GSM 1800 and 5 GHz WLAN indoor application with omnidirectional pattern and It is fabricated on FR‐4 low cost substrate with dielectric constant ε = 4.4 and loss tangent of tan δ = 0.02. In the second antenna, first band support 2.38–2.48 GHz that covers the WLAN with omnidirectional pattern but the second operation band is between 4.18 and 9.85 GHz for covering WLAN and at this frequency, antenna has semidirectional pattern. The second antenna is printed on Taconic TLY‐5 low permittivity substrate with relative permittivity of 2.2. Maximum antenna gain between −2 and 4 dBi but second antenna shows low gain and it is in range of 1.4–3.3 dBi. Albeit, here, the results of simulated antenna design are compared with experimental results. The current distribution shows that how these CRLH cells have helped for change in pattern of antenna. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:774–779, 2015
A 60 GHz low power direct‐conversion quadrature‐phase transmitter in 130 nm CMOS with low profile cavity backed antenna
Authors: Chen Bo , Su Guodong , Shen Li , Gao Jianjun 
Published: February 2015

ABSTRACTThis article presents the analysis, design, and implementation of a 60 GHz transmitter in 130 nm bulk CMOS, focusing on low power and high performance applications. The low power transmitter lineup consists of two double‐balanced Gilbert‐cells with dynamic current injection, on chip FGCPW meandering ring‐hybrid balun, Lange coupler, combiner, preamplifier, and low power transformer coupled power amplifier. A planar antenna with above 6 dB gain is also implemented. The measured output −1 dB compression point of the power amplifier is 9.6 dBm with 8.6 dB gain, and the 3 dB bandwidth is from 47 to 67 GHz (power amplifier) while drawing 90 mA from a 1.2 V supply. The mixer, preamplifer, and drive amplifier consume 12, 26, and 68 mA, respectively. The transmitter up‐converting an IF of 200 MHz to RF at 60.2 GHz achieve a total gain of 17.17 dB (simulated 21.09 dB) and saturation power higher than 9.53 dBm. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:785–789, 2015
W‐band power amplifier using broadband impedance‐transforming coupled line couplers
Authors: Kim Jungsik , Lee Sangho , Lee Seokchul , Kim Wansik , Kwon Hosang , Kwon Youngwoo , Jeong Jinho 
Published: February 2015

ABSTRACTIn this letter, a compact and broadband impedance‐transforming 90° hybrid is proposed, where two coupled lines with different characteristic impedances are cascaded to transform 50 to 25 Ω. The designed 50–25 Ω transforming coupler on a GaAs substrate shows a measured insertion loss of 1.1 dB with a return loss of 29.0 dB at 77 GHz. The insertion loss is lower than 2.0 dB in the range from 30 to 97 GHz. The proposed impedance‐transforming couplers are used in the design of a W‐band balanced power amplifier (PA) with a port impedance of 25 Ω, which allows the compact and broadband design of matching circuits in the PA. The PA fabricated by a 0.15‐μm GaAs pHEMT process shows a small‐signal gain of 13.3 dB at 79.5 GHz with a 3‐dB bandwidth of 21.4% (from 72 to 89 GHz). The measured output power is as high as 16.7 dBm at 75 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:803–806, 2015
Multiband planar monopole antenna using coupling control feed structure for mobile handsets
Authors: Lee Hongkoo , Lee Jaesuk , Moon Sungjin , Kim Mingi , Kim Hyeongdong 
Published: February 2015

ABSTRACTIn this article, a planar monopole antenna very close to the ground plane of mobile handsets is presented. Multiband operation is achieved by controlling the magnetic coupling between the feed structure and antenna structure with a slot structure and inductor. Measurements demonstrate that the proposed antenna possesses frequencies of 228 MHz (813–1041 MHz) and 601 MHz (1643–2244 MHz) with a voltage standing wave ratio of three even though the size of the proposed antenna is only 60 × 7 mm2. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:823–826, 2015
Design of mimo antenna with low correlation characteristic for low band applications
Authors: Lee Won‐Woo , Hong Seokjin 
Published: February 2015

ABSTRACTIn this letter, we propose a frequency tunable multiple input multiple output antenna at the frequency ranges of 704–960 MHz and low correlation performance over the tuning frequencies. The proposed antenna covers various long‐term evolution service bands: band17 (704–746 MHz), band13 (746–787 MHz), band5 (824–894 MHz), and band8 (880–960 MHz). To achieve wideband operation for the main antenna, an inverted L‐shaped slit is adopted on the conventional folded PIFA structure. The subantenna has multiple resonance from which on operating bands can be chosen by controlling the capacitance of a microelectromechanical system that is connected to the end of the proposed loop antenna. By choosing different antenna types for the main and subantennas, acceptable isolation characteristic was achieved as well as suitable envelope correlation coefficient characteristics. Both simulated and measured results are shown to illustrate the MIMO capabilities of the proposed structures. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:833–838, 2015
Bent optical fiber taper for refractive index measurements with tunable sensitivity
Authors: da Silveira Clenilson R. , Costa João C. W. A. , RoccoGiraldi Maria Thereza M. , Jorge Pedro , López Barbero Andrés Pablo , Germano Sydney Bragantine 
Published: February 2015

ABSTRACTThis letter presents experimental results of a refractive index sensor using a bent optical fiber taper. The approach of this sensor is based on an in‐line Michelson interferometer implemented with a single mode tapered fiber with a cleaved tip end and changing tilt angle, enabling to tune its refractive index sensitivity. Several radii of curvature are tested and their refractive index sensitivities are analyzed for a refractive index range between 1.333 and 1.405. A clear enhancement of the sensor response is achieved at specific taper bending radii. A substantial improvement in the refractive index sensitivity, at values very close to distilled water, is obtained with a radius of curvature of 11 mm. A significant enhancement of the sensor response is also achieved for a refractive index close to 1.40 with a radius of curvature of 16.5 mm. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:921–924, 2015
A compact dual‐band diversity antenna for WLAN applications with high isolation
Authors: Singh Hari Shankar , Pandey Gaurav Kumar , Bharti Pradutt Kumar , Meshram Manoj Kumar 
Published: February 2015

ABSTRACTA compact dual‐band multiple‐input multiple‐output (MIMO) antenna is presented for wireless local area networks (2.45/5.8 GHz) applications in mobile handsets. The proposed MIMO antenna consists of two planar inverted‐F antennas loaded with inverted J‐shaped slot and inverted L‐shaped slot. The defected ground structure of fork shaped slot is proposed between antenna elements to achieve high port‐to‐port isolation (<−20 dB). The distribution of specific absorption rate (SAR) over 1‐g and 10‐g tissues in human head are also studied for two different positions of the antenna at 2.45/5.8 GHz frequencies through SAR to PEAK location spacing ratio (SPLSR) according to Federal Communication Commission standard. The values of SPLSR are observed over 1‐g of tissues between 0.107 and 0.246 W/kg/cm and 0.304–0.122 W/kg/cm and over 10‐g of tissues between 0.242 and 0.124 W/kg/cm and 0.154 and 0.045 W/kg/cm at 2.45 GHz and 5.8 GHz, respectively. The S‐parameters, surface current distribution, diversity parameters, and radiation patterns are presented. The fabricated prototype are measured and obtained good agreement with simulated results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:906–912, 2015
Design of thin microwave absorbers using lossy frequency selective surfaces
Authors: Silva M. W. B. , Campos A. L. P. S. , Kretly L. C. 
Published: February 2015

ABSTRACTAn alternative procedure for the optimal design of both narrow and wide band electromagnetic absorbers is presented. The method, based on equivalent‐circuit model in conjunction with the full‐wave simulation, is used for computing lumped parameters of the frequency selective surface (FSS) elements. Thus, the procedure is applied to high‐impedance surfaces (HIS) to derivate the desired absorbers. The design presented here use simplified modeling to achieve numerical dimensioning of the FSS which results on the designed absorbers with performance very close to the desired attenuation and bandwidth. The resulting absorbers are implemented by placing lossy FSS over a dielectric layer backed by a metal ground plane. The experimental results show good agreements with theoretical results and the validity of the modeling method for the proposed structure. Characteristic attenuation for fabricated narrow band absorber show almost 20‐dB in 5.5 GHz. The attenuation bandwidth below −10 dB of the wideband absorber can reach 10–16 GHz with 3 mm thick only. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:928–933, 2015
Compact second‐order dual‐ and quad‐band bandpass filters using asymmetrical stub‐loaded resonator and uniform‐impedance resonator
Authors: Xu Jin 
Published: February 2015

AbstractIn this article, a second‐order dual‐band bandpass filters (BPF) operating at 1.8 GHz GSM and 5.2 GHz WLAN is first proposed by using asymmetrical stub‐loaded resonators (SLRs). Then, a set of half‐wavelength resonators (HWRs) are embedded into asymmetrical SLRs to produce a passband at 3.5 GHz, and the other set of HWRs are coupled with high‐impedance parallel coupling microstrip lines to generate a passband at 6.8 GHz, so that a second quad‐band BPF is successfully designed. The fabricated dual‐band BPF and quad‐band BPF have compact sizes of 0.052λg × 0.17λg and 0.054λg × 0.195λg, respectively. In addition, high band‐to‐band isolation, good in‐band return loss, and wide stopband can be also observed. Good agreement is shown between the simulated and measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:997–1003, 2015