• Title/Summary/Keyword: e-printing

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A study on the fabrication and characterization of high temperature superconducting(HTS) tapes in Bi-System (Bi-계 고온초전도 선재의 제조 및 특성 연구)

  • 정년호;성태현;한영희;한상철;이준성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.474-477
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    • 2002
  • We performed a continuous heat treatment experiment for long Si$_2$Sr$_2$CaCuO$_{x}$ (Bi2212) superconductor tapes on copper substrates. A precursor that contains a mixture of Bi$_2$O$_3$, SrCO$_3$, and CaCO$_3$ powders was prepared and screen-printed on Cu tapes. The screen- printed tapes were thermally treated by consecutive processes with various temperature settings using an air-filled tube furnace. The diffraction patterns and the microstructures of the high temperature superconductor thick films were analyzed by X-ray diffractometry (XRD) and optical Microscopy respectively, and the critical temperatures of the superconducting thick films were measured. The critical temperatures of the superconducting films were measured to be about 77K, and the films'crystallographic c-axes were confirmed to be normal to the film surfaces by XRD and morphology observation. We also observed that the thick superconducting layer is formed and aligned on the copper substrate via partial melted state that consists of a liquid phase and a secondary phase.e.

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Synthesis and Characterization of $La_{0.5}$$Sr_{0.5}$$MnO_3$-${Ce_{0.8}}{Gd_{0.2}}{O_{1.9}}$ Cathode for Solid Oxide Fuel Cell by Glycine-Nitrate Process (Glycine-Nitrate Process를 이용한 $La_{0.5}$$Sr_{0.5}$$MnO_3$-${Ce_{0.8}}{Gd_{0.2}}{O_{1.9}}$ 환원극 제조 및 특성평가)

  • 구본석;윤희성;김병호
    • Journal of the Korean Ceramic Society
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    • v.38 no.1
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    • pp.45-51
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    • 2001
  • 고체산화물 연료전지의 삼상 계면의 길이를 증가시키기 위해 Glycine-Nitrate Process(GNP)를 이용하여 환원극 재료인 L $a_{0.5}$S $r_{0.5}$Mn $O_3$(LSM)과 전해질 재료인 C $e_{0.8}$G $d_{0.2}$ $O_{1.9}$(CGO)를 합성하였다. 적당한 합성조건을 찾기 위하여 글리신의 양을 달리하여 분말을 합성한 결과 LSM의 경우 글리신이 양이온 몰수의 2배일 때 perovskite상이 얻어졌으며 비표면적은 34$m^2$/g 이었다. 합성된 LSM과 CGO 분말을 50:50 wt%로 혼합하여 제작된 환원극을 screen-printing법으로 코팅한 후 각각 1200, 1300, 1350 및 140$0^{\circ}C$에서 4시간 동안 소결한 후 80$0^{\circ}C$에서 power density와 양극과전압 등을 측정한 결과 130$0^{\circ}C$에서 소결한 단위전지에서 최대 309 mW/$ extrm{cm}^2$의 power density를 얻을 수 있었다.다.

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NUMERICAL STUDY OF THE DROPLET EJECTION BEHAVIOR OF NEWTONIAN AND SHEAR-THINNING FLUIDS (뉴튼유체와 전단희석유체의 액적분사 거동에 대한 수치해석적 연구)

  • Kim, E.;Baek, J.
    • Journal of computational fluids engineering
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    • v.17 no.3
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    • pp.33-38
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    • 2012
  • The droplet ejection behavior from drop-on-demand printhead are investigated numerically for Newtonian and shear-thinning fluid. The numerical simulation is performed using a volume-of-fluid model. In this study, we compare the printable range in terms of Z number and pinch-off time for Newtonian and shear-thinning fluids. The printability range are found to be 1.08 $$\leq_-$$ Z $$\leq_-$$ 12.9 for Newtonian fluid and 0.8 $$\leq_-$$ Z $$\leq_-$$ 12.9 for shear-thinning fluid. However, air entrainment is observed during merging of primary and satellite droplet within the printability range. The pinch-off time of the shear-thinning fluid is apparently shorter compared to the corresponding Newtonian fluid due to shear-thinning effects and the differences in the pinch-off time is enlarged significantly when the capillary number is larger than 0.5.

Innovation and craft in a climate of technological change and diffusion

  • Hann, Michael A.
    • The Research Journal of the Costume Culture
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    • v.25 no.5
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    • pp.708-717
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    • 2017
  • Industrial innovation in Britain, during the eighteenth and nineteenth centuries, stimulated the introduction of the factory system and the migration of people from rural agricultural communities to urban industrial societies. The factory system brought elevated levels of economic growth to the purveyors of capitalism, but forced people to migrate into cities where working conditions in factories were, in general, harsh and brutal, and living conditions were cramped, overcrowded and unsanitary. Industrial developments, known collectively as the 'Industrial Revolution', were driven initially by the harnessing of water and steam power, and the widespread construction of rail, shipping and road networks. Parallel with these changes, came the development of purchasing 'middle class', consumers. Various technological ripples (or waves of innovative activity) continued (worldwide) up to the early-twenty-first century. Of recent note are innovations in digital technology, with associated developments, for example, in artificial intelligence, robotics, 3-D printing, materials technology, computing, energy storage, nano-technology, data storage, biotechnology, 'smart textiles' and the introduction of what has become known as 'e-commerce'. This paper identifies the more important early technological innovations, their influence on textile manufacture, distribution and consumption, and the changed role of the designer and craftsperson over the course of these technological ripples. The implications of non-ethical production, globalisation and so-called 'fast fashion' and non-sustainability of manufacture are examined, and the potential benefits and opportunities offered by new and developing forms of social media are considered. The message is that hand-crafted products are ethical, sustainable and durable.

The impact behaviors of electrified micro-droplet with existence and nonexistence of electrical charged for surface (표면 전하 유무에 따른 대전된 미소액적의 충돌 현상)

  • Lee, Jaehyun;Kim, Jihoon;Byun, Doyoung
    • Journal of the Korean Society of Visualization
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    • v.13 no.1
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    • pp.49-53
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    • 2015
  • Recently, researches for droplet impact phenomena have been faced a new phase in the direction of studying the effect of complex external conditions (e.g. wettability, temperature, morphology, electric field, etc.) for depth understanding and precise controlling in various applications. Hence, here we investigated the electrified droplet impact phenomena, because there were few quantitative researches for electrified droplet impact when we considering many real applications such as electrospray, electrohydrodynamic (EHD) jet printing. To observe interaction effect of surface charge between substrate and droplet simultaneously, micro-droplets with various Reynolds number (Re) and Weber number (We) were dripped on super-hydrophobic surface with existence and nonexistence of electrical surface charge. It shows three kinds of impact behaviors, fully bouncing, partial bouncing, and splashing with different We. Also, charged droplet bounced higher on electrically charged surface than on non-charged surface. Additionally, transition regions of three impact behaviors were classified quantitatively with water hammer pressure value, which means instant pressure inside droplet at the impact moment.

Multi-functional Micro/Nano Printing Process with ElectroSpray Deposition(ESD) (ESD를 이용한 다기능 미세 프린팅 공정)

  • Kim D.S.;Lee W.H.;Lim H.E.;Park Y.D.;Lee K.B.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.597-598
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    • 2006
  • In this study, we used the ESD method to prepare the protein microarrays for observation the stem cell responses to pattern size, space and shapes. The ESD method allows a reduction in spot size, high efficiency of substance transfer, and high rate in fabrication as a result of ability to simultaneously deposit thousands of identical spots. Typical electro spraying conditions for the deposition of proteins were a voltage of $3{\sim}5keV$ and the humidity under 30%. The patterns of masks have a variety of shapes, spaces, and hole sizes from 10 um to $300{\mu}m$. Three kinds of proteins(collagen, fibronectin, and vitronectin dissolved in PBS) are deposited in a dry state, preserving the functional activity of proteins. Stem cells were cultured on each protein patterned sample at $37^{\circ}C$ for 1day.

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A Case of Hemolytic Uremic Syndrome in a Child with Ischemic Colitis (허혈성 대장염에 동반된 용혈성 요독 증후군 1례)

  • Kim Yang-Hyun;Ahn Sun-Young;Park Ji-Min;Lee Jae-Seung
    • Childhood Kidney Diseases
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    • v.8 no.1
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    • pp.86-90
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    • 2004
  • Hemolytic uremic syndrome(HUS) is characterized by acute renal failure, microangiopathic hemolytic anemia, and thrombocytopenia and the most common pathogen is Escherichia coli (E. coli) O157 : H7. Ischemic colitis, which rarely occurs in children, is due to the reduced local blood flow to the intestine, tissue necrosis and secondary bacterial infection. We describe a patient who was admitted with abdominal pain, vomiting and hematochezia, and diagnosed as ischemic colitis by barium enema. This patient showed hemolytic anemia, thrombocytopenia and progressive renal failure and was subsequently diagnosed as hemolytic uremic syndrome. After hemodialysis, the patient showed improvement of symptoms and resolution of renal failure and ischemic colitis.

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A Study on the Dyeing of Polyester Fiber in Alkaline Dyebath ―Dyeing Properties of Disperse dyes According to variation of pH values― (폴리에스테르섬유의 알칼리욕염색에 관한 연구 -pH변화에 따른 분산염료의 염색성을 중심으로-)

  • Sung, Woo Kyung;Ryu, Ki Hyo;Park, Soo Min;Kim, Kyung Hwan
    • Textile Coloration and Finishing
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    • v.8 no.1
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    • pp.34-42
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    • 1996
  • This Study was made to investigate alkaline dyeing systems for a new dyeing applicable polyester fibers. Disperse dyes for dyeing of polyester fibers were C.I. Red 60, Blue 56 and Yellow 54 as three primary colors of E type which used widely on the scene. Dyeing properties of dispers dyes on the polyester fibers are discussed according to variation of pH values for application of alkaline dyeing method compared with to ordinary acidic dyebath. Alkaline pH of the dyebath was controlled to pH 9 and 10.5 with buffer solutions using each hydrochloride and disodiumtetraborate, disodiumtetraborate and sodium hydroxide to promote the reproducibility of dyeing. Dyeing properties of dispers dyes on the polyester fibers by alkaline dyeing method compared with to ordinary acidic dyebath were discussed by estimation of color, wash-fastness, bleeding and migration of dyed polyester fabric.

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Interactive Transmission System Composition Using Internet and Broadcasting Network for the e Book Publications (통신과 방송망을 이용한 독서출판물 쌍방향 방송 시스템 구성방안)

  • 강명구
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.243-248
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    • 2002
  • The development of digital technologies and the appearance of computers have brought inevitable changes on the conventional printing publishing system and forms of books. An electronic book has marked its birth, sending out the contents of a book in digital and not using paper books but tile exclusive terminal. As far as systems are concerned, reading and publishing are going the separate ways is kind of impediments should be overcome by introducing the on-line order and sales service and constituting a network interworking service which delivers digital book contents on-line. This paper concerned the book publishing mode which would help to overcome the impediments. The last system is the one with broadcasting and communication as well as computers and the Internet mixed in a very complex way.

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Development of a New-type Apparatus Decomposing Volatile Organic Compounds using a Combination System of an Electrical Exothermic SiC Honeycomb and a Catalytic Filter

  • Nishikawa, Harumitsu;Takahara, Yasumitsu;Takagi, Osamu;Tsuneyoshi, Koji;Kato, Katsuyoshi;Ihara, Tadayoshi;Wakai, Kazunori
    • Asian Journal of Atmospheric Environment
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    • v.2 no.2
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    • pp.75-80
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    • 2008
  • A new-type apparatus decomposing volatile organic compounds (VOCs) using a combination system of an electrical exothermic SiC honeycomb and a catalytic filter was developed. This linear combination system is very useful to the catalytic decomposition of VOCs, because the gas involving VOCs is well heated in the SiC honeycomb and then flows into the catalytic filter. In the proposed apparatus, the outlet gas temperatures of SiC honeycomb maintained at ca. $300^{\circ}C$ after 5 min from the starting of applying electric current, and sufficient for the catalytic degradation of VOC components, i.e. toluene, isopropanol, methyl ethyl ketone and ethyl acetate. The average decomposition rate of total VOCs exhausted from a printing factory was 85% using pt catalyst at SV=19,000 in this system.