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Articles 241 - 254 of 254
Full-Text Articles in Entire DC Network
Highly Polarized All-Fiber Thulium Laser With Femtosecond-Laser-Written Fiber Bragg Gratings, Christina C. C. Willis, Erik Mckee, Pascal Böswetter, Alex Sincore, Jens Thomas, Christian Voigtländer, Ria G. Krämer, Joshua D. Bradford, Lawrence Shah, Stefan Nolte, Andreas Tünnermann, Martin Richardson
Highly Polarized All-Fiber Thulium Laser With Femtosecond-Laser-Written Fiber Bragg Gratings, Christina C. C. Willis, Erik Mckee, Pascal Böswetter, Alex Sincore, Jens Thomas, Christian Voigtländer, Ria G. Krämer, Joshua D. Bradford, Lawrence Shah, Stefan Nolte, Andreas Tünnermann, Martin Richardson
Faculty Bibliography 2010s
We demonstrate and characterize a highly linearly polarized (18.8 dB) narrow spectral emission ( < 80pm) from an all-fiber Tm laser utilizing femtosecond-laser-written fiber Bragg gratings. Thermally-dependent anisotropic birefringence is observed in the FBG transmission, the effects of which enable both the generation and elimination of highly linearly polarized output. To our knowledge, this is the first detailed study of such thermal anisotropic birefringence in femtosecond-written FBGs.
Refraction Effect In An In-Plane-Switching Blue Phase Liquid Crystal Cell, Daming Xu, Yuan Chen, Yifan Liu, Shin-Tson Wu
Refraction Effect In An In-Plane-Switching Blue Phase Liquid Crystal Cell, Daming Xu, Yuan Chen, Yifan Liu, Shin-Tson Wu
Faculty Bibliography 2010s
We develop a refraction model to analyze the electro-optic effects of an in-plane-switching blue phase liquid crystal (IPS-BPLC) cell. Good agreement with experiment is obtained. Based on this model, we optimize the parameters affecting the electro-optics of IPS-BPLC, such as electrode dimension, saturated induced birefringence, saturation electric field, and cell gap. An IPS-BPLC with low operation voltage ( < 10V(rms)) and high transmittance (similar to 80%) with single gamma curve can be achieved by optimizing the BPLC material and device structure.
Angular Dependent Reflections Of A Monodomain Blue Phase Liquid Crystal, Jin Yan, Yuan Chen, Daming Xu, Shin-Tson Wu
Angular Dependent Reflections Of A Monodomain Blue Phase Liquid Crystal, Jin Yan, Yuan Chen, Daming Xu, Shin-Tson Wu
Faculty Bibliography 2010s
The angular dependent reflection of a monodomain blue phase liquid crystal (BPLC) is investigated. Unlike a cholesteric liquid crystal with single twist structure, a monodomain BPLC exhibits several reflection orders from different crystal planes. As incident angle increases, the first order reflection experiences a blue shift while the second order experiences a red shift. We analyze the physical mechanism of the reflection from six (110) crystal planes. Good agreement between calculated and experimental results is obtained. Undoubtedly, this angular dependency would affect the performance of BPLC photonic devices that require an oblique incidence.
Regulation Of Pten/Akt Pathway Enhances Cardiomyogenesis And Attenuates Adverse Left Ventricular Remodeling Following Thymosin Beta 4 Overexpressing Embryonic Stem Cell Transplantation In The Infarcted Heart, Binbin Yan, Reetu D. Singla, Latifa S. Abdelli, Pawan K. Singal, Dinender K. Singla
Regulation Of Pten/Akt Pathway Enhances Cardiomyogenesis And Attenuates Adverse Left Ventricular Remodeling Following Thymosin Beta 4 Overexpressing Embryonic Stem Cell Transplantation In The Infarcted Heart, Binbin Yan, Reetu D. Singla, Latifa S. Abdelli, Pawan K. Singal, Dinender K. Singla
Faculty Bibliography 2010s
Thymosin beta 4 (T beta 4), a small G-actin sequestering peptide, mediates cell proliferation, migration, and angiogenesis. Whether embryonic stem (ES) cells, overexpressing T beta 4, readily differentiate into cardiac myocytes in vitro and in vivo and enhance cardioprotection following transplantation post myocardial infarction (MI) remains unknown. Accordingly, we established stable mouse ES cell lines, RFP-ESCs and T beta 4-ESCs, expressing RFP and an RFP-T beta 4 fusion protein, respectively. In vitro, the number of spontaneously beating embryoid bodies (EBs) was significantly increased in T beta 4-ESCs at day 9, 12 and 15, compared with RFP-ESCs. Enhanced expression of cardiac …
Low Voltage And High Contrast Blue Phase Liquid Crystal With Red-Shifted Bragg Reflection, Jin Yan, Zhenyue Luo, Shin-Tson Wu, Jyh-Wen Shiu, Yu-Cheng Lai, Kung-Lung Cheng, Shih-Hsien Liu, Pao-Ju Hsieh, Yuan-Chun Tsai
Low Voltage And High Contrast Blue Phase Liquid Crystal With Red-Shifted Bragg Reflection, Jin Yan, Zhenyue Luo, Shin-Tson Wu, Jyh-Wen Shiu, Yu-Cheng Lai, Kung-Lung Cheng, Shih-Hsien Liu, Pao-Ju Hsieh, Yuan-Chun Tsai
Faculty Bibliography 2010s
We demonstrated a low voltage and high contrast polymer-stabilized blue phase liquid crystal (BPLC) by shifting the Bragg reflection to a red wavelength. To retain high contrast ratio, a left-handed BPLC is sandwiched between a right-handed circular polarizer and a left-handed circular analyzer. The driving voltage is reduced by 35% as compared to that of a transparent BPLC, while keeping submillisecond response time. The proposed approach would accelerate the emergence of BPLC for next-generation display and photonic applications.
A Full-Color Reflective Display Using Polymer-Stabilized Blue Phase Liquid Crystal, Jin Yan, Shin-Tson Wu, Kung-Lung Cheng, Jyh-Wen Shiu
A Full-Color Reflective Display Using Polymer-Stabilized Blue Phase Liquid Crystal, Jin Yan, Shin-Tson Wu, Kung-Lung Cheng, Jyh-Wen Shiu
Faculty Bibliography 2010s
We demonstrate a full-color-capability reflective display using red, green, and blue sub-pixels of polymer-stabilized blue phase liquid crystal (BPLC) with different pitch lengths. Vivid colors originate from three-dimensional BPLC photonic crystalline structure. Surface alignment plays a key role to generate uniform and saturated colors in the voltage-off state. Analogous grayscale is achieved by the electric-field-induced unwinding of double-twist structure. This working principle is drastically different from the phase retardation effect of conventional liquid crystal displays. Moreover, the submillisecond response time enables crisp video displays without image blurring. Potential applications for reflective 3D display are also analyzed.
Deep Vascular Imaging In Wounds By Two-Photon Fluorescence Microscopy, Ciceron O. Yanez, Alma R. Morales, Xiling Yue, Takeo Urakami, Masanobu Komatsu, Tero A. H. Jarvinen, Kevin D. Belfield
Deep Vascular Imaging In Wounds By Two-Photon Fluorescence Microscopy, Ciceron O. Yanez, Alma R. Morales, Xiling Yue, Takeo Urakami, Masanobu Komatsu, Tero A. H. Jarvinen, Kevin D. Belfield
Faculty Bibliography 2010s
Deep imaging within tissue (over 300 mu m) at micrometer resolution has become possible with the advent of two-photon fluorescence microscopy (2PFM). The advantages of 2PFM have been used to interrogate endogenous and exogenous fluorophores in the skin. Herein, we employed the integrin (cell-adhesion proteins expressed by invading angiogenic blood vessels) targeting characteristics of a two-photon absorbing fluorescent probe to image new vasculature and fibroblasts up to approximate to 1600 mu m within wound (neodermis)/granulation tissue in lesions made on the skin of mice. Reconstruction revealed three dimensional (3D) architecture of the vascular plexus forming at the regenerating wound tissue …
Linear-Quadratic Optimal Control Problems For Mean-Field Stochastic Differential Equations, Jiongmin Yong
Linear-Quadratic Optimal Control Problems For Mean-Field Stochastic Differential Equations, Jiongmin Yong
Faculty Bibliography 2010s
Linear-quadratic optimal control problems are considered for mean-field stochastic differential equations with deterministic coefficients. By a variational method, the optimality system is derived, which is a linear mean-field forward-backward stochastic differential equation. Using a decoupling technique, two Riccati differential equations are obtained which are uniquely solvable under certain conditions. Then a feedback representation is obtained for the optimal control.
Femtosecond Laser Nanomachining Initiated By Ultraviolet Multiphoton Ionization, Xiaoming Yu, Qiumei Bian, Zenghu Chang, P. B. Corkum, Shuting Lei
Femtosecond Laser Nanomachining Initiated By Ultraviolet Multiphoton Ionization, Xiaoming Yu, Qiumei Bian, Zenghu Chang, P. B. Corkum, Shuting Lei
Faculty Bibliography 2010s
We report on the experimental results of 300 nm features generated on fused silica using a near-infrared (IR) femtosecond laser pulse initiated by an ultraviolet (UV) pulse. With both pulses at a short (similar to 60 fs) delay, the damage threshold of the UV pulse is only 10% of its normal value. Considerable reduction of UV damage threshold is observed when two pulses are at +/- 1.3 ps delay. The damage feature size of the combined pulses is similar to that of a single UV pulse. A modified rate equation model with the consideration of defect states is used to …
Near-Infrared Femtosecond Laser Machining Initiated By Ultraviolet Multiphoton Ionization, X. Yu, Q. Bian, B. Zhao, Z. Chang, P. B. Corkum, S. Lei
Near-Infrared Femtosecond Laser Machining Initiated By Ultraviolet Multiphoton Ionization, X. Yu, Q. Bian, B. Zhao, Z. Chang, P. B. Corkum, S. Lei
Faculty Bibliography 2010s
We report on the experimental study of microstructures fabricated on the surface of fused silica by two femtosecond laser pulses, a tightly focused 266 nm beam followed by a loosely focused 800 nm beam. By setting the fluence of each pulse below the damage threshold, visible microstructures are fabricated using the combined beams. Our results suggest that the ultraviolet pulse generates seed electrons through multiphoton absorption, and the near-infrared pulse utilizes these electrons to cause damage by avalanche ionization.
Structures Of Maug In Complex With Quinol And Quinone Madh, Erik T. Yukl, Lyndal M. R. Jensen, Victor L. Davidson, Carrie M. Wilmot
Structures Of Maug In Complex With Quinol And Quinone Madh, Erik T. Yukl, Lyndal M. R. Jensen, Victor L. Davidson, Carrie M. Wilmot
Faculty Bibliography 2010s
MauG has been cocrystallized with methylamine dehydrogenase (MADH) with its TTQ cofactor in the o-quinol (TTQ(OQ)) and quinone (TTQ(OX)) forms and the structures of the resulting complexes have been solved. The TTQ(OQ) structure crystallized in either space group P2(1) or C2, while the TTQ(OX) structure crystallized in space group P1. The previously solved structure of MauG in complex with MADH bearing an incompletely formed TTQ cofactor (preMADH) also crystallized in space group P1, although with different unit-cell parameters. Despite the changes in crystal form, the structures are virtually identical, with only very minor changes at the protein-protein interface. The relevance …
Diradical Intermediate Within The Context Of Tryptophan Tryptophylquinone Biosynthesis, Erik T. Yukl, Fange Liu, J. Krzystek, Sooim Shin, Lyndal M. R. Jensen, Victor L. Davidson, Carrie M. Wilmot, Aimin Liu
Diradical Intermediate Within The Context Of Tryptophan Tryptophylquinone Biosynthesis, Erik T. Yukl, Fange Liu, J. Krzystek, Sooim Shin, Lyndal M. R. Jensen, Victor L. Davidson, Carrie M. Wilmot, Aimin Liu
Faculty Bibliography 2010s
Despite the importance of tryptophan (Trp) radicals in biology, very few radicals have been trapped and characterized in a physiologically meaningful context. Here we demonstrate that the diheme enzyme MauG uses Trp radical chemistry to catalyze formation of a Trp-derived tryptophan tryptophylquinone cofactor on its substrate protein, premethylamine dehydrogenase. The unusual six-electron oxidation that results in tryptophan tryptophylquinone formation occurs in three discrete two-electron catalytic steps. Here the exact order of these oxidation steps in the processive six-electron biosynthetic reaction is determined, and reaction intermediates are structurally characterized. The intermediates observed in crystal structures are also verified in solution using …
Monolithic Quantum-Well-Tunable Laser Based On Optical Beam Steering And Area-Selective Intermixing, Abdullah Zakariya, Patrick Likamwa
Monolithic Quantum-Well-Tunable Laser Based On Optical Beam Steering And Area-Selective Intermixing, Abdullah Zakariya, Patrick Likamwa
Faculty Bibliography 2010s
A monolithic tunable laser on a quantum well (QW) structure is demonstrated by integrating an optical beam-steering section with an area-selectively intermixed QW gain section. Wavelength tuning is achieved by guiding an amplified optical beam over an optical gain medium that consists of three laterally adjacent regions containing a quantum well that has been selectively intermixed to varying extents. The laser light output can be tuned over a total of a 17-nm wavelength range by separately injecting electrical current pulses to each of the two parallel contacts in the steering region and to the optical amplifier contact. (C) 2013 Society …
Recent Developments In Surgery Minimally Invasive Approaches For Patients Requiring Pancreaticoduodenectomy, Scott A. Zenoni, J. Pablo Arnoletti, Sebastian G. De La Fuente
Recent Developments In Surgery Minimally Invasive Approaches For Patients Requiring Pancreaticoduodenectomy, Scott A. Zenoni, J. Pablo Arnoletti, Sebastian G. De La Fuente
Faculty Bibliography 2010s
Over the past decade, minimally invasive surgery has been introduced as a means to allow manipulation of delicate tissues with outstanding visualization of the surgical field. The purpose of this article is to review the available literature regarding early postoperative outcomes and the technical challenges of minimally invasive pancreaticoduodenectomy, including robotic techniques. Herein, we provide a retrospective review of all published studies in the English literature in which a minimally invasive pancreaticoduodenectomy was performed. The reported advantages of minimally invasive pancreaticoduodenectomy include better visualization, faster recovery time, and decreased length of hospital stay. In cases of robotic approaches, some of …