bluuebunny/crossref_metadata_2025_split huggingface dataset:
A compact modified triangular CPW‐fed antenna with multioctave bandwidth
Authors: Siahcheshm Amir , Nourinia Javad , Zehforoosh Yashar , Mohammadi Bahman 
Published: November 2014

ABSTRACTThis article presents the results of a compact modified triangular CPW‐fed antenna that exhibits multioctave performance. This modification significantly improves the antenna's impedance bandwidth by 198% over an ultra‐wideband (UWB) frequency range from 3.06 to 35 GHz. The return‐loss (S11) performance over this frequency range is designed to be better than −10 dB. These characteristics make the proposed antenna an excellent candidate for numerous UWB applications and next generation communication systems. The key physical parameters affecting the antenna's frequency characteristics have also been investigated to determine optimum antenna performance. The antenna's measured return loss and E‐plane and H‐plane radiation patterns show a very good correlation with the requirements of UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:69–72, 2015
A miniaturized wearable button antenna for Wi‐Fi and Wi‐Max application using transparent acrylic sheet as substrate
Authors: Mandal Bappaditya , Parui Susanta Kr. 
Published: November 2014

ABSTRACTA compact miniaturized wearable antenna with the appearance of a button on clothing for Wi‐Fi and Wi‐Max applications as well as used for body centric communication is presented. The radiating elements of the antenna are made of copper tape, while the substrate is given a property of transparent acrylic fiber sheet material and fed by a coaxial line through the ground plane. The proposed antenna is simulated by Ansoft HFSS finite element method based simulation software and has been optimized to operate within the Wi‐Fi and Wi‐Max frequency bands with center frequency of 5.5 GHz (5250–5850 MHz). The measured peak gain of this antenna is 2.92 dBi. There is a good matching between the simulated and the measured result. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:45–49, 2015
SIW‐based interdigital bandpass filter with harmonic suppression
Authors: Kurudere Sinan , Ertürk Vakur B. 
Published: November 2014

ABSTRACTA novel configuration of interdigital bandpass filter based on the substrate integrated waveguide (SIW) technology is proposed. In addition to the interdigital resonators in SIW that determine the main response/characteristics of the filter, narrowing the width of the SIW at the center of the filter and additional vias at its input and output parts act as two additional control mechanisms to achieve the desired filter response. Moreover, dumbbells are etched to the ground side of the microstrip feeding sections at both ends of the filter to improve its harmonic suppression. A prototype filter is designed and fabricated for verification. The measured results are in good agreement with the simulations, and the filter exhibits very good harmonic suppression. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:66–69, 2015
A compact novel CPW‐fed antenna with square spiral‐patch for multiband applications
Authors: Beigi Payam , Nourinia Javad , Zehforoosh Yashar , Mohammadi Bahman 
Published: November 2014

ABSTRACTA compact novel coplanar waveguide‐fed antenna with square spiral‐patch for multiband applications is presented. The antenna consists of a square‐spiral patch with two L‐shape strips. With subjoin square spiral the number of frequency resonance is increasing. Also by introducing two L‐shaped strips in the inside of square spiral, much wider impedance bandwidth can be produced, especially at the higher bands. The operating frequencies of the proposed antenna are 2.62/3.40/4.42/5.92/8.32 GHz. Some key parameters affecting the antenna performance have been analyzed using computer simulations. To validate the simulation results, the prototypes of the proposed antenna are fabricated on an inexpensive FR‐4 substrate and tested. Good radiation characteristics of the proposed antenna have been obtained. The simulated and measured results are in good agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:111–115, 2015
A novel compact ultrawide band filter for reconfigurable notches
Authors: Sahay Janardan , Goutham Dugyala , Tanweer  , Kumar Sanjay 
Published: November 2014

ABSTRACTA novel compact ultrawide band (UWB), bandpass filter (BPF) with reconfigurable and embedded notches at WiMAX (3.5 GHz) and WLAN (5.2 GHz) is proposed. UWB BPF is embedded with a rectangular resonator and improved stepped impedance resonator to introduce notched in the passband. Filter reconfiguration is achieved by varying the conductance of microstrip line. Filter response shows a sharp rejection of both WiMAX and WLAN bands. Experimental results are in good agreement with the simulated data. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:88–91, 2015
A planar UWB monopole antenna with dual band notched function
Authors: Srivastava Gunjan , Mohan Akhilesh 
Published: November 2014

ABSTRACTA printed monopole antenna for UWB applications with dual band notch property is proposed in this letter. The UWB monopole consists of modified circular patch with an elliptical slot to reject WiMAX frequencies (3.3–3.8 GHz). The modified ground plane is introduced to attain the wide impedance UWB bandwidth with G‐shaped slot below the feed line to reject 5.15–5.85 GHz WLAN frequencies. The length of embedded slot not only depends on notch frequency and substrate dielectric constant but also depends on substrate thickness and slot width. In this letter, we have presented a technique to calculate accurately the slot length of the embedded slot. The simulated and measured result shows that the designed antenna is expected to be good candidate for UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:99–104, 2015
Double‐sided aperture‐coupled vertically mounted strip antenna
Authors: Kim Cheol Hoo , Kim Yeon Ju , Gharate Pushpalata , Kwak Jin Hwan , Kim Jeong Phill 
Published: November 2014

ABSTRACTThis article presents dual‐band designs of aperture‐coupled vertically mounted strip antenna (ACVMSA). Two vertically mounted (VM) patches on either side of the VM substrate are excited via the coupling aperture to support dual‐band operation. A parametric study is undertaken to examine the effects of the related structure parameters and develop a design strategy. It is known that each resonant frequency and the corresponding coupling amount can be controlled nearly independently of each other, giving an advantage for dual‐band ACVMSA design. In addition, the antenna supports the same linear polarization. The antenna designed was fabricated, and the measured results were found to agree well with those calculated. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:157–160, 2015
Triple‐band CPW‐fed monopole antenna with three branch strips for WLAN/WiMAX triple‐band application
Authors: Yoon Joong Han 
Published: November 2014

ABSTRACTIn this article, a novel coplanar waveguide (CPW)‐fed monopole antenna with three branch strips for wireless local area network (WLAN)/worldwide interoperability of microwave access (WiMAX) triple‐band applications is proposed. The proposed antenna is simply composed of three branch strips. By carefully selecting the positions and lengths of these branch strips, the desired resonant modes excited at 2.46/3.6/5.4 GHz with less than −10 dB frequency responses to the impedance can be achieved. In addition, an acceptable agreement is obtained between the simulation and the experiment. Also, the compact design of the proposed antenna, which has enough impedance bandwidth, makes the antenna suitable for WLAN and WiMAX operations. This article further presents and discusses the 2D radiation patterns and 2D gains according to the experiment results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:161–166, 2015
Photonic generation of tunable microwave signal using a passively Q‐switched dual‐wavelength fiber laser
Authors: Wang Meng , Chen Cong , Li Qi , Huang Kaiqiang , Chen Haiyan 
Published: November 2014

ABSTRACTA novel photonic tunable microwave generation based on a dual‐wavelength Q‐switched Er‐doped fiber laser is proposed and experimental demonstrated. In the proposed configuration, two cascaded fiber Bragg gratings (FBG) are used as a cavity mirror, and a semiconductor saturable absorber mirror as another one. By changing the operation temperature of the FBG, stable dual‐wavelength Q‐switched pulses with tunable wavelength spacing are achieved, and wavelength spacing of 0.24–0.66 nm, corresponding to microwave signals of 30–82.5 GHz can be obtained. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:166–168, 2015
A flexible CPW series resonator using phase compensation method on polyimide film at 5.8‐GHz
Authors: Lee Hyun‐Wook , Lee Jong‐Chul 
Published: November 2014

ABSTRACTIn this article, a flexible coplanar waveguide (CPW) series resonator combined with short‐ and open‐end CPW series stubs on polyimide film is presented. To obtain equivalent circuit of each stub, a new phase compensation method is applied. The accuracy of equivalent circuit with this method is confirmed by comparison between electromagnetic simulation and circuit simulation results. Based on equivalent inductance and capacitance for short‐end series stub and open‐end series stub, respectively, a CPW series resonator is designed without optimization at 5.8 GHz. The measured frequency responses of the series stubs and resonator are in good agreement with the predicted simulation results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:193–196, 2015
Ultra wide band planar printed quasi‐Yagi antenna with size reduction for water detection in the Egyptian desert
Authors: Elsheakh Dalia M. , Abdallah Esmat A. 
Published: November 2014

ABSTRACTUltrawideband quasi‐Yagi antenna with size reduction is presented for developing the ground penetrating radar system. The proposed antenna printed on FR‐4 substrate and consists of meandered driver dipole, a radial quarter‐wavelength stubs, and two meandered parasitic strips. The meandered driver dipole is connected to the slot line through coplanar strip line. The ground plane is modified by symmetrically adding two extended folded meandered stubs to reduce the lateral size. The results show that the proposed quasi‐Yagi antenna has a wide bandwidth and good unidirectional radiation characteristics. The −10 dB impedance bandwidth extends from 47 to 150 MHz with 45% size reduction and average gain around 4.5 dBi over operating band with very flat gain (around 5 dB) over the entire bandwidth. The proposed antenna presents an excellent end‐fire radiation with a front‐to‐back ratio greater than 10 dB. Simulations and measurements show very good agreement with the proposed antenna. High frequency structure simulator is used to design and study the effect of sandy soil, water layer and the distance between sand and proposed antenna. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:226–233, 2015
A planar microstrip‐fed tri‐band filtering antenna for WLAN/WiMAX applications
Authors: Koley Santasri , Mitra Debjani 
Published: November 2014

ABSTRACTIn this article, a combination of microstrip bandpass filter and antenna is presented to give sharp response at desired frequency bands along with very low insertion loss. Three single bandpass filters, designed at wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) frequency bands, are integrated into a tri‐band bandpass filter. An ultrawideband antenna is further added to the structure. The antenna operates in 2.23–2.587, 3.468–3.816, and 5.345–5.607 GHz, suitable for WLAN 2.4 GHz and WiMAX 3.5/5.5 GHz applications. The proposed tri‐band filtering antenna shows monopole‐like radiation patterns in the desired frequency bands with high out‐of‐band rejection. Good agreement between simulated and measured results validates possible applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:233–237, 2015
Novel compact band‐notched UWB antenna using convex‐shaped slot patch
Authors: Tang Zhi‐Jun , Wu Xiao‐Feng , Zhan Jie 
Published: November 2014

ABSTRACTA simple and compact printed band‐notched antenna operating at a frequency range of 3.1–22.0 GHz is presented for ultrawideband applications. The proposed antenna comprises a convex‐shaped patch embedded by an elliptic slot and a rectangular slot, and an additional rectangular patch, which is fed by a microstrip line and a partial ground plane with a rectangular slit. Several bandwidth enhancement techniques are applied in the antenna structure to broaden the bandwidth to a great extent. The overall size of the antenna is 36 × 33 mm2. The simulation and experiment results show that the proposed antenna achieves good impedance bandwidth of 3.05–22.5 GHz (the return loss less than −10 dB), with a band‐notched of 5.1–5.9 GHz. Furthermore, the proposed antenna also achieves stable antenna gain and radiation patterns. The measured results agree well with the simulated prediction. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:201–203, 2015
Circularly polarized MIMO antenna array for point‐to‐point communication
Authors: Nayan M. K. A. , Jamlos M. F. , Jamlos M. A. 
Published: November 2014

ABSTRACTA compact circularly polarized multiple input multiple output (CP‐MIMO) array antenna for point‐to‐point communication is proposed in this article. The two by four‐element antenna array, dimensioned at 58 × 110 mm2 is composed of rectangular‐shaped with corner‐truncated radiating elements. The presented antenna is developed by two MIMO element with circular polarization characteristics aims to boost gain, more robust to adverse weather conditions and less signal's reflection. By constructing eight 45° truncated edges of 2.45 mm, 45 mm element spacing of Y‐axis, and 39.5‐mm element spacing of X‐axis together contribute to the circular polarization capability of 2.24 axial ratio, 0.00031024 correlation coefficient, and 10 dB diversity gain. The CP‐MIMO antenna which is fed by two coaxial feeds has produced the gain up to 14.25 dB with reflection coefficient of −24.5 dB. Thus, combination of circular polarization, high gain, and excellent MIMO characteristics collectively lead the proposed CP‐MIMO array antenna to avoid significant attenuated signals under adverse atmospheric condition and propagation issues such as reflection, absorption, phasing, and multipath. The proposed antenna's operating frequency of 5.8 GHz has great potential to be applied in point‐to‐point wireless backbone communication system. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:242–247, 2015
The findings of a clinical surveillance bronchoalveolar lavage programme in pre‐school patients with cystic fibrosis
Authors: Linnane Barry , Vaish Shashi , Clarke Donna , O'Sullivan Niamh , McNally Paul 
Published: November 2014

SummaryBackgroundEvidence suggests infection is present in the lower airways of young children with cystic fibrosis (CF), even when clinically stable. Oropharyngeal samples (OPS) are typically used for airway surveillance in these children but have been shown to have low positive predictive values and low sensitivity in detecting lower airway infection when compared with the reference standard, bronchoalveolar lavage (BAL).MethodsThe aim of this study was to determine the prevalence of pathogens in lower airway samples detected as part of a pilot clinical BAL surveillance programme, in young children aged from one to six years old, and to ascertain if their detection resulted in a change in treatment.ResultsDuring the study 78 bronchoscopies were performed on 38 patients. The average age at the time of bronchoscopy was 2.7 years (range 0.3–7.0 year). A significant organism was detected in 58 (74.5%) BALs. Haemophilus influenzae was detected in 27 (34.6%) samples, 16 (20.5%) samples had Staphylococcus aureus, and nine (11.5%) had Pseudomonas aeruginosa. Change in treatment occurred after 46 (58.9%) BALs.ConclusionsThis study suggests that, in young non‐expectorating children with CF, routine surveillance bronchoscopy allows the detection of significant lower airway pathogens and provides the opportunity for targeted treatment of sub‐clinical infection. Pediatr Pulmonol. 2015; 50:327–332. © 2014 Wiley Periodicals, Inc.
Central Vascular Access Device: An Adapted Evidence-Based Clinical Practice Guideline
Authors: Ciocson Maria Ana Flor Rasonabe , Hernandez Maranda G. , Atallah Mohammad , Amer Yasser S. 
Published: November 2014

Abstract
Background: Our aim was to adapt recommendations from high-quality, evidence-based clinical practice guidelines (CPGs) for central vascular access device (CVAD) insertion, management, and removal in King Saud University Medical City. Currently, the hospital has a policy and procedure for CVAD insertion; however, the methodology of creating the policy document was not evidence-based, and the clinical content was not up to date. A new CPG will guide the revision of CVAD policies and procedures and eliminate variation in clinician practices.
Methods: The King Saud University Medical City CPG Committee introduced the modified ADAPTE process methodology for adaptation and implementation of CPGs originally developed by the ADAPTE Collaboration.
Results: The final decision of the panel after full assessment of 2 selected source CPGs was to adopt all Centers for Disease Control and Prevention CPG recommendations and some essential sections from the Infusion Nurses Society CPG recommendations. In addition, the team developed new implementation tools.
Conclusions: The ADAPTE process is an excellent scientific and rigorous process for CPG adaptation and clinical performance improvement. It can be further adapted according to the local context and resources to promote a sense of ownership of the adapted CPG. Furthermore, new CPGs will have a positive effect on hospital-wide accreditation processes and local benchmarking of health care quality outcomes.
Unraveling Sea-Level Variations and Tectonic Uplift in Wave-Built Marine Terraces, Santa María Island, Chile
Authors: Jara-Muñoz Julius , Melnick Daniel 
Published: November 2014

AbstractThe architecture of coastal sequences in tectonically-active regions results mostly from a combination of sea-level and land-level changes. The objective of this study is to unravel these signals by combining sequence stratigraphy and sedimentology of near-shore sedimentary sequences in wave-built terraces. We focus on Santa María Island at the south-central Chile margin, which hosts excellent exposures of coastal sediments from Marine Isotope Stage 3. A novel method based on statistical analysis of grain-size distributions coupled with facies descriptions provided a detailed account of transgressive–regressive cycles. Radiocarbon ages from paleosols constrain the chronology between > 53 and ~ 31 cal ka BP. Because the influence of glaciations can be neglected, we calculated relative sea-level curves by tying the onset of deposition on a bedrock abrasion platform to a global sea-level curve. The observed depositional cycles match those predicted for uplift rates between 1.2 and 1.8 m/ka. The studied sedimentary units represent depositional cycles that resulted in reoccupation events of an existing marine terrace. Our study demonstrates wave-built marine terrace deposits along clastic shorelines in temperate regions can be used to distinguish between tectonic uplift and climate-induced sea-level changes.
Liquid jet eruption from hollow relaxation
Authors: Ghabache Élisabeth , Séon Thomas , Antkowiak Arnaud 
Published: November 2014

AbstractUsing a model experiment, we explore the dynamics of inertial liquid jets arising from a gravitational cavity collapse. The focus of the study is to elucidate the link between both the dynamical and kinematical properties of the jet and the initial cavity geometry, for a wide range of physical parameters. We demonstrate that the jets exhibit shape similarity and reveal a robust relationship between the jet tip velocity and the initial cavity geometry, regardless of the details of the collapse process. We argue that this relation reflects a flow focusing mechanism, and we propose a simple model capturing the key features of the erupting jet velocity scaling. Finally, the relevance of these results to other jets occurring in e.g. large bubble detachment or wave impact on walls is discussed.
“Christianity, Commerce and Civilization”: Child Labor and the Basel Mission in Colonial Ghana, 1855–1914
Authors: Koonar Catherine 
Published: November 2014

AbstractFocusing specifically on colonial Ghana between 1855 and 1914, this article aims to situate the history of child labor in colonial Africa within the larger historiography of African labor history. Relying primarily on the records of the Basel Mission, this article complicates the narrative of labor history by studying how the mission acquired and sustained the labor of children and youth at various mission stations as part of the greater “missionary project.” This article argues that childhood in colonial Ghana can be viewed as a site of contestation between the competing interests of patriarchy, race, and colonial and missionary authority, in which the labor of children was used to achieve a larger degree of control and influence in the region.
BaasorKlaas? Afrikaner Working-Class Responses to Transformation in South Africa, ca. 1977–2002
Authors: van Zyl-Hermann Danelle 
Published: November 2014

AbstractWhite workers and white working-class politics have been neglected in the historiography of South Africa during the second half of the twentieth century. This article seeks to extricate white workers from this historiographical neglect and fracture homogenizing representations of white, specifically Afrikaner, experiences of democratization. It does so by reintroducing class to a debate dominated by race. Employing a discursive analysis sensitive to issues of class, it shows that white workers were confronted with democratizing change and disempowerment more than a decade before the end of apartheid and suggests that class politics continue to inform white responses in post-apartheid South Africa. In this way, it argues for a historical, discursive approach to uncovering the power dynamics of class and the complex intersection of working-class and racial identities in the late twentieth century.
The production effect in memory: a prominent mnemonic in children
Authors: ICHT MICHAL , MAMA YANIV 
Published: November 2014

ABSTRACTThe ‘Production Effect’ (PE) refers to a memory advantage for items studied aloud over items studied silently. Thus, vocalizing may serve as a mnemonic that can be used to assist learners in improving their memory for new concepts. Although many other types of mnemonic have been suggested in the literature, the PE seems especially appropriate for young children, as it does not involve literacy skills. The present study is a first investigation of the PE in children. In two experiments we tested five-year-olds in a PE paradigm using pictures of objects as stimuli. In Experiment 1, pictures of familiar objects were presented to be remembered, and in Experiment 2 we used pictures of unfamiliar objects (evaluating new vocabulary acquisition). In both experiments we showed a memory advantage for vocally produced words (‘look and say’) over other types of learning (‘look’, ‘look and listen’), suggesting the PE as a prominent memory and learning tool.