1,720,975 research outputs found
Microstrip antenna with compact anti-spiral slot resonator for 2.4 GHz energy harvesting applications
No full textThis paper proposes a microstrip antenna with novel slot resonator for compact RF energy harvesting modules operating at 2.4 GHz. The antenna has the overall size of (0)/3 x (0)/3 with electrically small slot radiator of (0)/11 x (0)/15 at 2.4 GHz. Both measurement and simulation results show the proposed energy harvesting antenna to be utilized in DC power supply modules of modern low power wireless networks. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1404-1408, 201
UHF RFID Microwave Sensor Tag Design for an RSSI-Based Machine Learning Assisted Binary Ethanol–Water Mixture Characterization
No full text<p>This article proposes a novel microwavesensor-based UHF radio frequency identification (RFID) tagdesign for the dielectric parameter characterization of binaryethanol-water liquid samples with different concentrations.The sensor tag is designed on an FR-4 substrate with theImpinj M6 Dura chip. The fabricated prototype has an over-all physical size of 82.1x19.2 mm. The mixture samplesdropped into the middle part of the microwave sensor tagchange the RSSI value from the RFID system, the mainparameter to be associated with the water ratio and dielectricparameters in the binary mixture to be used in machine learn-ing (ML). Several ML regression methods have been used forethanol-water characterization. The GPR model obtained apromising result with R-2=0.98, RMSE=4.08, and MAE=0.85 for the water ratio in the mixture,R-2=0.98, RMSE=3.02,and MAE=0.66 for the dielectric constant real part, and R-2=0.99, RMSE=0.26, and MAE=0.05 for the dielectric constantimaginary part of the mixture, and the model yielded thehighest predictive performance among the four ML models.According to the obtained ML metrics, the water ratio in the binary mixture, the dielectric constant real and imaginaryparts of the mixture using the RSSI received over the RFID system, the distance, and the RFID frequency have beensuccessfully characterized. The proposed design has the technical potential to be used as characterization equipmentfor binary ethanol-water samples with low cost, high precision, and reusable features with ML assistance</p>
Compact Bioimplantable MICS and ISM Band Antenna Design for Wireless Biotelemetry Applications
No full textA compact dual-band bioimplantable antenna with novel resonator geometry is designed for dual-band wireless biotelemetry applications in MICS and ISM bands. The radiating element geometry is based on an L-shaped transmission line fed anti-spiral resonator structure, which is loaded with the spiral resonator at the end to increase the effective electrical length. The effect of resonator geometric parameters on the return loss is discussed with the inclusion of three layered lossy human model in the numerical calculations. The footprint size of the optimized bioimplantable antenna is 15 x 15 x 1.92 mm^3, having the total surface area of λ0/20 x λ0/20, where λ0 is the free space wavelength at 403 MHz in MICS band. The compact dual-band antenna has the impedance bandwidth of 24.81% at 403 MHz and 14.7% at 2.45 GHz with the gain values -12.25dBi and -12.4 dBi in MICS and ISM bands, respectively. The average SAR values at the resonance frequencies are numerically computed to find out the input power delivered to the antenna for the reliable operation. The radiation parameters and 3D radiation patterns indicate the potential use of the proposed implantable antenna with the permissible gain in dual-band wireless biotelemetry applications
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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