Filling behavior and mold release force in UV nanoimprinting using PDMS mold in different atmosphere

2017 ◽  
Author(s):  
Kenta Suzuki ◽  
Sung-Won Youn ◽  
Hiroshi Hiroshima
Keyword(s):  
Pdms Mold ◽  
Release Force

Abstract 343: Chest Compression Compliance With Guidelines Declines Over the Course of Rescues

Circulation ◽  
2019 ◽  
Vol 140 (Suppl_2) ◽  
Author(s):  
James K Russell ◽  
Digna González Otero ◽  
Sofia Ruiz de Gauna ◽  
Mikel Leturiondo ◽  
Jesus M Ruiz ◽  
...  
Keyword(s):  
Real Time ◽  
Chest Compression ◽  
Steady Increase ◽  
Release Force

Introduction: CPR guidelines recommend limits for rate and depth, and release (avoidance of leaning). Simultaneous compliance with all three recommendations is challenging, sustained compliance more so. Hypothesis: Compliance with rate, depth and release guidelines is limited, and will decline over the course of rescues. Methods: Acceleration and force signals were extracted from monitor/defibrillators equipped with CPR monitors in 248 adult cases of manual CPR during out-of-hospital resuscitations treated by Tualatin Valley Fire & Rescue (TVF&R, Tigard, OR) during 2016 and 2017. TVF&R personnel delivered continuous compression CPR with real-time feedback available for rate, depth and leaning. Depth was calculated from acceleration. Peak depth, release force, and rate were measured for each compression. Release with force exceeding 2.5 kg-f was counted as incomplete (leaning). Results: Cases included 1802 (1055-2683) (median, IQR) compressions (total 481,407 compressions). Compliance with all three recommendations was 25% initially, declining to 19% for the ends of the longest rescues (> 3000 compressions from 48 cases). Depth compliance and complete release varied relatively little (31-36%, 93-95% respectively) and irregularly over the course of resuscitation. Early, 45% of compressions were too shallow (< 50 mm), and 21% were too deep (> 60 mm). Depth exceptions shifted over the course of resuscitation (to 36%, 28% respectively). Rate compliance declined from 73% to 54%. Rates below 100 cpm were 9% initially, declining to 5%. Rates exceeding 120 cpm were 18% early on, but climbed to 41% towards the end of long resuscitations, accounting for most of the decline in compliance with guidelines. Conclusions: Compliance with all 3 recommendations for CPR compressions is challenging, and becomes more so as the chest changes in response to compressions. Most problematic is a steady increase in compression rates above 120 cpm.

scholarly journals Optimized Soft Lithography Method for Polymer Cholesteric Liquid Crystal Flakes Fabrication

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 441 ◽  
Author(s):  
Guanqing Zhou ◽  
Sunqian Liu ◽  
Wei Liu ◽  
Dong Yuan ◽  
Guofu Zhou
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Polyvinyl Alcohol ◽  
Soft Lithography ◽  
Cholesteric Liquid Crystal ◽  
Release Time ◽  
Pdms Mold ◽  
Speed Up ◽  
Liquid Crystal Flakes

Polymer cholesteric liquid crystal (PCLC) flakes are gaining increasing interest for a wide variety of applications because of their unique optical properties and capabilities. Soft lithography is the most effective way to fabricate regularly shaped PCLC flakes. However, it is not easy to peel the flakes from the mold without breaking them. In order to peel the PCLC flakes from the patterned polydimethylsiloxane (PDMS) mold in a convenient way, in this paper, a method of coating a layer of polyvinyl alcohol (PVA) on a PDMS mold was proposed. The influence of the thickness of the PVA layer on the shape of the PCLC flakes and the release time from the PDMS mold were investigated. The results show that the presence of the PVA layer can speed up the release of the PCLC flakes and help maintain the shape effectively. Notably, the utilization of a PVA layer makes the PDMS mold recyclable. The influence of PCLC flake shape was also studied. This work will promote the development of switchable PCLC flake-based technologies.

scholarly journals Inertial focusing in a parallelogram profiled microchannel over a range of aspect ratios

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Joo Young Kwon ◽  
Dong-Ki Lee ◽  
Jungwoo Kim ◽  
Young Hak Cho
Keyword(s):  
Aspect Ratio ◽  
Cfd Simulation ◽  
Rectangular Cross Section ◽  
Wet Etching ◽  
Pdms Mold ◽  
Rectangular Microchannel ◽  
Inertial Focusing ◽  
Particle Focusing ◽  
Aspect Ratios ◽  
Si Wafer

AbstractIn this study, particle focusing phenomena are studied in parallelogram and rectangular cross-sectioned microchannels of varying aspect ratio. In contrast to prior work the microchannels were fabricated using anisotropic wet etching of a Si wafer, plasma bonding, and self-alignment between the Si channel and the PDMS mold. It is shown that the inertial focusing points of the fabricated microchannels of parallelogram and rectangular cross-section were modified as the aspect ratio of the microchannels changed. The particle focusing points of the parallelogram profiled microchannel are compared with those of the rectangular microchannel through experimental measurements and CFD simulation. It is shown that particles can be efficiently focused and separated at a relatively low Reynolds number using a parallelogram profiled microchannel with a low aspect ratio.

Fabrication of various cross-sectional shaped polymer microchannels by a simple PDMS mold based stamping method

2012 ◽  
Vol 6 (3) ◽  
pp. 240-246 ◽  
Author(s):  
Jong Seob Choi ◽  
Yunxian Piao ◽  
Tae Seok Seo
Keyword(s):  
Pdms Mold ◽  
Cross Sectional

Liquid Capacitor Based on Hafnium Oxide

2019 ◽  
Vol 801 ◽  
pp. 211-216
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Muhammad Asim Raza ◽  
Jin Ho Bae
Keyword(s):  
Surface Tension ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Hafnium Oxide ◽  
Aqueous Electrolyte ◽  
Current Collector ◽  
Electrochemical Analysis ◽  
Deionized Water ◽  
Pdms Mold ◽  
X Ray

In this work, we synthesize Hafnium (IV) oxide (HfO2) ink from hafnium chloride (HfCl4) powder assisted with deionized water. The poly acrylic acid (PAA) is used as surfactant to decrease the surface tension. Conversion of HfCl4 into HfO2 was detected by Raman spectroscopy and energy dispersive X-ray spectroscopy (EDS) characterization techniques. This proposed ink can be easily synthesized at a low temperature. Using the synthesis ink, a liquid capacitor is proposed, which is tested for electrochemical analysis. Indium tin oxide (ITO) coated PET is used as bottom and top current collector electrode, polydimethylsiloxane (PDMS) mold is used as separator, and HfO2 ink is used as aqueous electrolyte. Liquid capacitor is also tested on different bending diameters using bending machine from flat down to 10 mm bending curvature, which shows a stable capacitor function.

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