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Nanofibers from electrically driven viscoelastic jets: modeling and experiments
Colman P. Carroll,Eduard Zhmayev,Yong Lak Joo 한국유변학회 2008 Korea-Australia rheology journal Vol.20 No.3
Modeling and experiments of three electrospinning systems have been presented and they are i) axisymmetric instabilities in electrospinning of various polymeric solutions, ii) non-isothermal modeling of polymer melt electrospinning, and iii) control of nanoparticle distribution and location via confined selfassembly of block copolymers during electrospinning. It has been demonstrated that predicted simulations are in good agreement with corresponding electrospinning experiments, and theoretical analysis provides fundamental understanding of phenomena that take place during electrospinning of various polymeric liquids.
State Estimation and Modeling of a Model Helicopter
Miles Colman,Shinji Suzuki 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
This paper presents simulation results for vehicle state estimation using the Extended Kalman Filter (EKF) to combine high-frequency high-drift inertial sensor data with zero-drifty noisy low-frequency heading, position and velocity information. The filter is outlined. The EKF also estimates gyro and accelerometer biases of an inertial measurement unit (IMU). which measures 3-axis acceleration and 3-axis angular velocities. Attitude is maintained in the unit quaternion representation to provide a singularity-free heading estimate at extreme attitudes. The attitude error is maintained in Gibbs vector form. allowing the use of 6 states for attitude error and gyro bias. The EKF fuses the IMU data with bias-free noisy position and velocity information from a GPS receiver, and Euler angles measured by a 3-axis compass. Comparison is made between results from straightforward implementation of the EKF. and an EKF implemented using both first-order state transitions and an Upper Diagonal-factored form of the covariance matrix update. We plan to present modeled and actual flight paths of the helicopter at the conference. The model used was originally used by V. Gavrilets for a heavier gas-powered helicopter.
Nanofibers from electrically driven viscoelastic jets: modeling and experiments
Carroll, Colman P.,Zhmayev, Eduard,Kalra, Vibha,Joo, Yong-Lak The Korean Society of Rheology 2008 Korea-Australia rheology journal Vol.20 No.3
Modeling and experiments of three electrospinning systems have been presented and they are i) axisymmetric instabilities in electrospinning of various polymeric solutions, ii) non-isothermal modeling of polymer melt electrospinning, and iii) control of nanoparticle distribution and location via confined self-assembly of block copolymers during electrospinning. It has been demonstrated that predicted simulations are in good agreement with corresponding electro spinning experiments, and theoretical analysis provides fundamental understanding of phenomena that take place during electrospinning of various polymeric liquids.
( Ruben J. Colman ),( David T. Rubin ) 대한장연구학회 2016 Intestinal Research Vol.14 No.3
Background/Aims: Ulcerative colitis (UC) patients are at greater risk for the development of colorectal neoplasia. Several individual studies have demonstrated associations between severity of histologic inflammation and colorectal neoplasia. However, a comprehensive systematic review has not been completed. We performed a systematic review and meta-analysis to explore the relationship between histologic inflammation and risk for neoplasia among available observational studies. Methods: Three databases (EMBASE, MEDLINE and the Cochrane Library) were systematically searched. Studies were included if they included UC patients who underwent colonoscopic assessment and when histologic inflammation and colorectal neoplasia were both reported. Colorectal neoplasia rates were compared. Quantitative meta-analysis was attempted. Results: Four of 1,422 records found were eligible. Results from 2 case-control studies reported a 3.5-fold increased risk for colorectal neoplasia associated with a single point increase in histologic inflammation. This result was further corroborated by one cohort study that demonstrated increased hazard ratios. The second cohort study reported outcomes for patients with normal gross endoscopy, but had increased histological inflammation when neoplasia was assessed. Finally, this study reported increased risk for neoplastic progression by histological inflammation among patients who were normal by gross endoscopic evaluation. Quantitative meta-analysis was unsuccessful due to heterogeneity between study measures. Conclusions: There is strong evidence that histologic inflammation among patients with UC increases the risk of colorectal neoplasia. The depth and nature of assessment of additional clinical variables was varied and may have resulted in greater outcome discrepancy. Additional study related to mechanisms of inflammation-related neoplasia and therapeutic modification is needed.
Synthesis and Characterization of Indandione derivatives for polymer solar cell
( Analia Dorazio Colman ),정미진,이준호,손동환,( Sabrina Aufar Salma ),( Rahmatia Fitri Binti Nasrun ),김주현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The donor- acceptor (D-A) type polymers for donor material, named BDT-HT-INDT and BDTF-HT-INDT have been designed and characterized for bulk heterojuction polymer solar cells (PSCs). These polymers were synthesized via stille coupling method between the electron defficeint unit HT-INDT with BDT and BDTF, respectively. The BDT-HT-INDT and BDTF-HT-INDT polymers possessed the highest occupied molecular orbital (HOMO) levels ranged -5.02 to -5.04 eV and the lowest unoccupied molecular orbital (LUMO) levels ranged -3.51 to -3.59 eV, which covered broad absorption ranges with low optical bandgaps. Inverted-type PSCs based on the blend of BDT-HT-INDT (or BDTF-HT-INDT) as a donor and Y6BO as an acceptor were fabricated to investigate the performance of those polymers. The power conversion efficiencies (PCEs) of the optimized PSCs are reached up to 3.73 % for BDT-HT-INDT and 3.20 % for BDTF-HT-INDT.