1,721,107 research outputs found
Stretchable Gold Nanomembrane Electrode with Ionic Hydrogel Skin-Adhesive Properties
No full textSkin has a dynamic surface and offers essential information through biological signals originating from internal organs, blood vessels, and muscles. Soft and stretchable bioelectronics can be used in wearable machines for long-term stability and to continuously obtain distinct bio-signals in conjunction with repeated expansion and contraction with physical activities. While monitoring bio-signals, the electrode and skin must be firmly attached for high signal quality. Furthermore, the signal-to-noise ratio (SNR) should be high enough, and accordingly, the ionic conductivity of an adhesive hydrogel needs to be improved. Here, we used a chitosan-alginate-chitosan (CAC) triple hydrogel layer as an interface between the electrodes and the skin to enhance ionic conductivity and skin adhesiveness and to minimize the mechanical mismatch. For development, thermoplastic elastomer Styrene-Ethylene-Butylene-Styrene (SEBS) dissolved in toluene was used as a substrate, and gold nanomembranes were thermally evaporated on SEBS. Subsequently, CAC triple layers were drop-casted onto the gold surface one by one and dried successively. Lastly, to demonstrate the performance of our electrodes, a human electrocardiogram signal was monitored. The electrodes coupled with our CAC triple hydrogel layer showed high SNR with clear PQRST peaks. © 2023 by the authors.11Ysciescopu
Detection of influenza virus using peroxidase‐mimic of gold nanoparticles
Get PDFThis is the peer reviewed version of the following article Syed Rahin Ahmed, Jeonghyo Kim, Tetsuro Suzuki, Jaebeom Lee, and Enoch Y. Park., （2016） Detection of influenza virus using peroxidase-mimic of gold nanoparticles., Biotechnol. Bioeng., 113:2298-2303, which has been published in final form at http://dx.doi.org/10.1002/bit.25982. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.autho
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Study on Weldability of Stainless Steel for LNG Carrier Using High Power Fiber Laser
Get PDFThese days, world wide interest about global warming and environmental pollution and exhausting fossil fuel which have been main energy source in all around the world. So many country have tried to find out the solution by investing new & renewable and clean energy. Therefore LNG have been widely used as a substitution of fossil fuel and clean energy that emits less pollutant like SOx, NOx. Therefore LNG consumption has been quickly raised and LNG carriers have been getting larger for decades. Our shipbuilding industry has been the most powerful in the world. On the other hand, it's also in the middle of stiff competition between developed nations with original technique and quickly progressing chinese shipbuilding companies. In this situation, increasing productivity is one of the most important factor to lead the industry.
Meanwhile, although the laser welding technique has been already used for various industry such as automobile, semiconductor, electronics and so on, not very widely applied in shipbuilding except for cruise ships. Laser is high density heat source, so it can make high speed welding with minimum heat input possible. Especially the high power fiber laser is recently commercialized and has high beam quality and the smallest system size compare with conventional laser due to it's unique oscillating mechanism. Because of these advantages it's thought that the most suitable heat source for LNG cargo tank welding precess which has to be conducted inside of ships. So we suggest fiber laser welding technique as a substitutional heat source of exiting plasma and arc welding. In this study fiber laser was used for welding of stainless steel for LNG carrier to applicate laser welding technique for shipbuilding industry. Used material was STS304L and STS316L which have low carbon less than 0.03% and their thickness was 1.2mm and 8mm respectively.
First of all, we carried out bead on plate welding changing defocused distance and shield gas-related factor such as kind of shield gas, nozzle angle, distance of nozzle tip from the laser incident point and flow rate. Through this experiment, penetration characteristic was analyzed to understand characteristic of fiber laser because there's a few research about it's basic quality. And we could find out it's distinctive nature in welding process. Optimal welding condition decided from the results was shield gas : Ar(25ℓ/min), nozzle angle : 40°, nozzle distance : 20mm and defocused distance(fd) : -4mm for STS316L, 0mm for STS304L.
Second, butt and lap welding was conducted changing laser power, welding speed, Then penetration characteristic was analyzed and optimal parameters for each materials and joint configuration was decided based on experimental results.
Third, mechanical properties of weld such as hardness, tensile strength and toughness were measured and compared to that of base metal. As a result same or better mechanical properties were obtained in weld.
Last, weldability, microstructure and mechanical properties of stainless steel welded by fiber laser were compared to those by plasma. As a result, although the laser welding has several times faster speed similar properties and smaller weld and heat affected zone were obtained. Consequently. this study proves the superiority of fiber laser welding for LNG carrier.
Increasing welding speed and controling defects technique are important factor related to productivity. Therefore, the achievement in this study can be utilized to prove the superiority of laser as a substitutional heat source of exiting plasma and arc.1. 서론 - 1
1.1 연구 배경 - 1
1.2 연구 목적 및 범위 - 4
2. 이론적 배경 - 6
2.1 LNG선의 특성 및 종류 - 6
2.1.1 LNG선의 특성 - 6
2.1.2 LNG선의 종류 - 9
2.1.3 LNG선용 스테인리스강 및 기타재료의 성질 - 14
2.2 LNG선용 스테인리스강의 용접특성 - 18
2.2.1 LNG선용 스테인리스강의 용접성 - 18
2.2.2 기존의 열원에 의한 용접성 - 29
2.3 화이버 레이저의 특성 및 LNG선으로의 적용성 - 32
2.3.1 화이버 레이저의 특성 - 32
2.3.2 LNG선으로의 적용성 - 36
3. 실험 방법 - 38
3.1 실험 재료 및 장치 - 38
3.1.1 실험 재료 - 38
3.1.2 실험 장치 - 38
3.2 실험 방법 및 시편제작 - 41
3.3 경도 및 기계적 성질 시험 - 43
3.3.1 시편채취 및 에칭 - 43
3.3.2 비커스 경도시험 - 43
3.3.3 인장시험 - 46
3.3.4 극저온 샤르피 충격시험 - 46
4. 실험 결과 및 고찰 - 49
4.1 비초점거리에 따른 용입특성 - 49
4.1.1 STS316L의 용입특성 - 49
4.1.2 STS304L의 용입특성 - 54
4.2 실드가스의 종류 및 변수에 따른 용입특성 - 57
4.2.1 실드가스 종류가 용접에 미치는 영향 - 57
4.2.2 노즐 각도에 따른 용입특성 - 60
4.2.3 노즐 거리에 따른 용입특성 - 62
4.2.4 유량에 따른 용입특성 - 64
4.3 레이저 가공인자와 용접형상이 용입에 미치는 영향 - 67
4.3.1 겹치기 용접시의 용입특성 - 67
4.3.2 맞대기 용접시의 용입특성 - 76
4.4 용접조건에 따른 용접부의 기계적 성질 - 81
4.4.1 경도분포 - 81
4.4.2 인장특성 - 84
4.5 레이저와 플라즈마 아크의 용접특성 비교 - 89
4.5.1 용입특성 - 89
4.5.2 기계적 성질 - 93
4.5.3 용접부의 미세조직 - 96
5. 결론 - 102
참고문헌 - 10
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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