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Dataset in support of the journal article 'Vacuum thermoforming for packaging flexible electronics and sensors in e-textiles'.
No full textThe dataset contains excel files supporting the figures presented in the journal article by A Valavan, A Komolafe, N R. Harris and S Beeby "Vacuum thermoforming for packaging flexible electronics and sensors in e-textiles" published in Transactions on Components, Packaging and Manufacturing Technology.
This dataset contains data for:
Fig. 4. Temperature measurement for different heat powers
(3 separate measurements)
Fig. 10. Peel strength for Platilon U 4201 AU on Kapton N after vacuum forming and hot air gun at 230ºC. Uneven peaks
indicate non-uniform bonding
Fig. 11. Peeling test of Platilon U 4201 AU on Kapton E after vacuum forming and hot air gun at 230ºC for bonding
Fig. 14: Comparison between CO sensor response for
encapsulated versus unencapsulated circuits with
temperature and humidity readings at the time of testing.
Fig. 16: Average number of bending cycles survived by
unpackaged and packaged flexible CO and series resistors
filaments
Fig. 17. Average number of wash cycles survived by
unpackaged and packaged flexible CO and series resistors
filaments
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Investigation of encapsulant materials for packaging flexible gas sensor for E-textile application
No full textToxic gases and particulate matter (such as CO2, NO2 etc.) account for millions of deaths every year due to respiratory-related issues. Wearable gas sensors offer a good platform for continuously monitoring the quality of air can give information about the degree of air pollution at any location and time. This will allow the wearer to monitor their exposure and to participate in crowd sensing air pollution in which the data can be shared and used for mapping polluted areas and enable safety measures for preventing and mitigating the effect of these gases on humans and their environment. In this regard, e-textiles provide an attractive platform for a wearable gas sensor. This work builds upon previous research conducted at the University of Southampton that developed a flexible circuit fabrication and packaging technology that enables the circuits to be woven into a textile. The packaging process previously demonstrated used a conformal polymer (Kapton) film bonded to the substrate but for an e-textile gas sensor, it is important that this packaging is gas permeable whilst remaining flexible and waterproof. There have not been any reported approaches for the encapsulation of flexible gas sensors with thermoplastic films previously. This work focuses on investigating the various techniques and flexibility of the materials that are waterproof and gas permeable for addressing the above issue. A flexible strip with a MOX gas sensor was built to detect carbon monoxide. A novel way of packaging flexible electronics using vacuum forming was achieved using breathable and waterproof thermoplastic polyurethane film. The sensor was also encapsulated with two different thermoplastic materials - microporous polytetrafluoroethylene Zitex G - 104 and PTFE glass fibre fabric using flexible jigs. Zitex G - 104 and PTFE fibre glass fabric encapsulated flexible sensor have negligible effect on the sensor response to Carbon monoxide whereas TPU acts as a gas barrier film. It was found that the Zitex G - 104 packaged sensor has the highest mechanical robustness to bending and washing cycles
Encapsulation Process and Materials Evaluation for E-Textile Gas Sensor
No full textThe degree of pollution in the environment increases because of the vehicular emissions such as carbon monoxide (CO) and nitrogen dioxide (NO2) gases. To minimize the exposure levels, it is necessary for individuals to be able to determine for themselves the pollution levels of the environments they are in so that they can take the necessary precautions. Textile-based gas sensors are an emerging solution and this paper furthers the concept by investigating a novel method for encapsulating gas sensors in textiles. While encapsulation is required to improve the durability and lifetime of the sensors, it essential for their operation that the encapsulants do not reduce the sensitivity of the gas sensor. This paper investigates the selectivity of two different flexible and breathable thermoplastic encapsulants (Platilon®U and Zitex G-104) for sensing carbon monoxide by observing the sensor response with and without the encapsulants. Results show that while the encapsulants both enable the sensor to still function, Platilon®U reduces the sensor sensitivity, whereas Zitex G-104 has very little effect
Vacuum thermoforming for packaging flexible electronics and sensors in e-textiles
No full textPackaging of flexible electronics is essential for e-textile applications to reduce degradation of performance caused by mechanical stress and environmental effects and to increase durability. Conformal coatings for packaging have the advantage of reducing rigidity and can be seamlessly integrated into fabrics. Vacuum forming is a technique for packaging electronic devices with thermoplastic films of various thicknesses providing uniform coating. Polyurethane is a widely used thermoplastic material in e-textile and can be easily processed by vacuum forming for packaging. In this article, a detailed explanation of the working of Formech 450DT vacuum former is discussed for packaging small electronic chip for e-textile application with thermoplastic polyurethane (TPU). Two types of flexible circuits were packaged: a carbon monoxide (CO) gas sensor and a series of resistors on flexible PCB. The packaged CO flexible sensor and series resistors endured 5.3 times and 1.7 times, respectively, more bending cycles than unpackaged flexible electronic filament samples. For the washing cycles, the packaged flexible strips with CO sensor and series resistors endured 1.5 times.</p
A smart cycling platform for textile-based sensing and wireless power transfer in smart cities
No full textThis paper proposes an integrated smart cycling system for assisted cycling, energy harvesting and wireless power transfer systems on a bicycle, an enabling platform for autonomous e-textiles-based sensing. The cyclist is assisted by a switched reluctance motor, which also acts as a switched reluctance generator that harvests a peak power of 7.5W, at 10% efficiency during cycling to power on body sensors. To demonstrate wearable on-body sensing, a thin flexible CO2 gas sensor filament which can be woven in fabric, is presented and evaluated. Wearable inductive resonant wireless power transfer is achieved using textile embroidered coils on the bicycle’s handle and cycling gloves, achieving more than 80% WPT efficiency from the bicycle to the cyclist’s clothing useful for powering mobile on-body sensors
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
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