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Goel R Kamal S Khurana B Kumar S Malik KP Bodh SA Singh M 《Contact lens & anterior eye》2012,35(2):89-91
Introduction
The lens coloboma results from a segmental defective or absent development of the zonules. It is usually unilateral and bilateral cases are rare. These eyes are at greater risk of complications during cataract surgery due to ocular malformations. In addition the capsular bag requires stabilization using modified capsule tension ring, capsular tension segment or capsular anchor.Methods
Lens extraction is indicated for cataract or subluxation if visual function is sufficiently compromised. We report our surgical experience in a patient with bilateral isolated lens coloboma by performing manual small incision cataract surgery (MSICS) in left eye and phacoemulsification in right eye.Results
The nuclear rotation was hampered because of the lack of zonules and presence of lens coloboma. MSICS was converted to the intracapsular technique in left eye, though breaking the nucleus into pieces during phacoemulsification in right eye enabled its mobilization and successful completion with implantation of modified capsule tension ring.Conclusions
A patient with lens subluxation and lens coloboma is better managed by phacoemulsification as compared to the MSICS. 相似文献2.
Hengyue Li Chuantian Zuo Dechan Angmo Hasitha Weerasinghe Mei Gao Junliang Yang 《纳微快报(英文)》2022,(5):173-184
Perovskite solar cells(PSCs)have attracted tremendous attention as a promising alternative candidate for clean energy genera-tion.Many attempts have been made w... 相似文献
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JS Yu I Kim JS Kim J Jo TT Larsen-Olsen RR Søndergaard M Hösel D Angmo M Jørgensen FC Krebs 《Nanoscale》2012,4(19):6032-6040
Semitransparent front electrodes for polymer solar cells, that are printable and roll-to-roll processable under ambient conditions using different approaches, are explored in this report. The excellent smoothness of indium-tin-oxide (ITO) electrodes has traditionally been believed to be difficult to achieve using printed front grids, as surface topographies accumulate when processing subsequent layers, leading to shunts between the top and bottom printed metallic electrodes. Here we demonstrate how aqueous nanoparticle based silver inks can be employed as printed front electrodes using several different roll-to-roll techniques. We thus compare hexagonal silver grids prepared using either roll-to-roll inkjet or roll-to-roll flexographic printing. Both inkjet and flexo grids present a raised topography and were found to perform differently due to only the conductivity of the obtained silver grid. The raised topographies were compared with a roll-to-roll thermally imprinted grid that was filled with silver in a roll-to-roll process, thus presenting an embedded topography. The embedded grid and the flexo grid were found to perform equally well, with the flexographic technique currently presenting the fastest processing and the lowest silver use, whereas the embedded grid presents the maximally achievable optical transparency and conductivity. Polymer solar cells were prepared in the same step, using roll-to-roll slot-die coating of zinc oxide as the electron transport layer, poly-3-hexylthiophene:phenyl-C(61)-butyric acid methyl ester (P3HT:PCBM) as the active layer and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the top electrode, along with a flat bed screen printed silver grid. The power conversion efficiency (PCE) obtained for large area devices (6 cm(2)) was 1.84%, 0.79% and 1.72%, respectively, for thermally imprinted, inkjet and flexographic silver grids, tested outside under the real sun. Central to all three approaches was that they employed environmentally friendly solvents, i.e. water based nanoparticle silver inks. 相似文献
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Dechan Angmo Irene Gonzalez‐Valls Sjoerd Veenstra Wiljan Verhees Subarna Sapkota Sebastian Schiefer Birger Zimmermann Yulia Galagan Jorgen Sweelssen Monica Lira‐Cantu Ronn Andriessen Jan M. Kroon Frederik C. Krebs 《应用聚合物科学杂志》2013,130(2):944-954
Five different indium‐tin‐oxide free (ITO‐free) polymer solar cell architectures provided by four participating research institutions that all presented a laboratory cell performance sufficient for use in mobile and information and communication technology (ICT) were evaluated based on photovoltaic performance and lifetime tests according to the ISOS protocols. The comparison of the different device architectures was performed using the same active material (P3HT: PCBM) and tested against an ITO‐based reference device. The active area was 1 cm2 and rigid glass or flexible polyester substrates were employed. The performance results were corroborated by use of a round robin methodology between the four participating laboratories (DTU/DK, ECN/NL, Frauenhofer ISE/DE, and the Holst Centre/NL), while the lifetime testing experiments were carried out in only one location (DTU). Five different lifetime testing experiments were carried out for a minimum of 1000 h: (1) shelf life (according to ISOS‐D‐1); (2–3) stability under continuous 1 sun illumination (1000 Wm?2, AM1.5G) at low (37 ± 3°C) and high (80 ± 5°C) temperatures (according to ISOS‐L‐1 and ISOS‐L‐2); (4) stability under continuous low‐light conditions at 0.1 sun (100 Wm?2, AM1.5G, 32°C) (according to ISOS‐LL); (5) continuous illumination (670 Wm?2, AM1.5G) at high temperature (65°C) and high humidity (50% RH) (according to ISOS‐L‐3). Finally, the upscaling compatibility of these device architectures based on the device photovoltaic behavior, stability and scalability were identified and we confirm that an architecture that presents a high score in only one aspect of the solar cell performance is not sufficient to justify an investment in upscaling. Many will require further technical development. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 944‐954, 2013 相似文献
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J Dechan 《Canadian Metallurgical Quarterly》1997,38(8):499-501
Medical management was unable to prevent the development of an extrapulmonary abscess in a 10-year-old Thoroughbred gelding with anaerobic pleuropneumonia. Intercostal thoracostomy achieved drainage of the abscess. Resolution of the abscess and subsequent bronchopleural fistulas was monitored by ultrasonography and video-endoscopy. The horse returned to training 4 mo after discharge. 相似文献
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Dechan Angmo Suren A. Gevorgyan Thue. T. Larsen-Olsen Roar R. Søndergaard Markus Hösel Mikkel Jørgensen Ritu Gupta Giridhar U. Kulkarni Frederik C. Krebs 《Organic Electronics》2013,14(3):984-994
Polymer solar cell modules were prepared directly on thin flexible barrier polyethylene terephthalate foil. The performance of the modules was found to be scalable from a single cell with an area of 6 cm2 to modules with a total area of up to 186 cm2. The substrate thickness was also explored and the performance was found to be independent of thickness in the range of 20–130 μm. The thinner substrates were found to present some challenge regarding handling but were not limited in performance. Large area modules on a substrate thickness of 45 μm were finally prepared by full roll-to-roll processing employing P3HT:PCBM as the active material and were found to exhibit a total area efficiency of >1% (1000 W/m?2; AM1.5G) with a typical active-area efficiency in the 1.5–1.6% for total module area of >110 cm2 due to high fill factors in excess of 50%. The modules were also found to have an active-area efficiency of >1% under low light levels (~100 W m?2). The modules were then subjected to extensive stability testing for a minimum of 1000 h employing several ISOS protocols. The modules presented higher than 80% of the initial performance (T80) in the dark (ISOS-D-1), in dark under elevated temperature of 65 °C (ISOS-D-2), under low light (ISOS-LL), under full sunlight (ISOS-L-2), and under outdoor testing (ISOS-O), which was conducted in two locations in India and Denmark. We estimate maximum T80 for those tests to be 2800, 5000, 1300, 1000, and 3500 h respectively. The modules showed significant sensitivity to high humidity and had low values for T80 for dark storage tests at 50 °C/85%RH (ISOS-D-3) and accelerated operation conditions with 0.7 sun/65 oC/50%RH (ISOS-L-3). We found the modules to be particularly suited for information and communications technology (ICT) and mobile applications where low humidity (<50%) and lower temperatures (<65 °C) can be anticipated and we estimate operational lifetimes in excess of 1 year. 相似文献