Search results for: Y. Tsui

Items from 1 to 20 out of 122 results

article

Ligand Basicity and Chelate Effects on Sulfur Insertion vs. Sulfur Reduction by Zinc Thiolate Complexes

W. T. Michael Seo, Victor A. Tsang, Moises Ballesteros, Emily Y. Tsui

Chemistry – A European Journal > 30 > 41 > n/a - n/a

4‐ and 5‐coordinate zinc thiolate complexes supported either by bis(carboxamide)pyridine frameworks or by substituted tris(pyrazolyl)borate ligands react with elemental sulfur (S₈) following two distinct pathways. Some zinc thiolate moieties insert sulfur atoms to form zinc polysulfanide complexes, while others reduce sulfur and oxidize the thiolate. Here, we compare the effects of ligand electronics,...

article

Wavefront aberrometry repeatability and agreement—A comparison between Pentacam AXL Wave, iTrace and OPD‐Scan III

Kelvin H. Wan, Xu Lin Liao, Marco Yu, Rachel W. Y. Tsui, more

Ophthalmic and Physiological Optics > 42 > 6 > 1326 - 1337

Introduction To compare intrasession agreement and repeatability of wavefront aberration measurements from three different aberrometers obtained using Hartmann–Shack, ray tracing and automated retinoscopy methods, as well as their interdevice agreement. Methods Three consecutive measurements were obtained using the Pentacam AXL Wave, the iTrace and the OPD‐Scan III in 47 eyes of 47 patients. Wavefront...

article

Effect of in‐package atmospheric cold plasma discharge on microbial safety and quality of ready‐to‐eat ham in modified atmospheric packaging during storage

Barun Yadav, Ana Claudia Spinelli, N. N. Misra, Ying Y. Tsui, more

Journal of Food Science > 85 > 4 > 1203 - 1212

Abstract Listeria monocytogenes is often responsible for postprocessing contamination of ready‐to‐eat (RTE) products including cooked ham. As an emerging technology, atmospheric cold plasma (ACP) has the potential to inactivate L. monocytogenes in packaged RTE meats. The objectives of this study were to evaluate the effect of treatment time, modified atmosphere gas compositions (MAP), ham formulation,...

article

Body mass index and complications following major gastrointestinal surgery: a prospective, international cohort study and meta‐analysis

EuroSurg Collaborative, R. Blanco‐Colino, S. Lee, S. K. Kamarajah, more

Colorectal Disease > 20 > 8 > O215 - O225

Aim Previous studies reported conflicting evidence on the effects of obesity on outcomes after gastrointestinal surgery. The aims of this study were to explore the relationship of obesity with major postoperative complications in an international cohort and to present a meta‐analysis of all available prospective data. Methods This prospective, multicentre study included adults undergoing both elective...

article

An automated quantitative DNA image cytometry system detects abnormal cells in cervical cytology with high sensitivity

O. G. Wong, M. W. Ho, O. K. Tsun, A. K. Ng, more

Cytopathology > 29 > 3 > 267 - 274

Objective To evaluate the performance of an automated DNA‐image‐cytometry system as a tool to detect cervical carcinoma. Methods Of 384 liquid‐based cervical cytology samples with available biopsy follow‐up were analyzed by both the Imager System and a high‐risk HPV test (Cobas). Results The sensitivity and specificity of Imager System for detecting biopsy proven high‐grade squamous intraepithelial...

article

Potential biomarkers of tissue hypoxia during acute hemodilutional anemia in cardiac surgery: A prospective study to assess tissue hypoxia as a mechanism of organ injury

Gregory M. T. Hare, Kaho Han, Yevheniy Leshchyshyn, Nikhil Mistry, more

Canadian Journal of Anesthesia/Journal canadien d'anesthésie > 2018 > 65 > 8 > 901-913

Purpose Hemodilutional anemia is associated with acute kidney injury (AKI) and mortality in patients undergoing cardiac surgery by mechanisms that may include tissue hypoxia. Our hypothesis was to assess if changes in the potential hypoxic biomarkers, including methemoglobin and erythropoietin, correlated with a decrease in hemoglobin (Hb) concentration following hemodilution on cardiopulmonary bypass...

article

Significant strengthening of nanocrystalline Ni sub-micron pillar by cyclic loading in elastic regime

Jung-A Lee, Dong-Hyun Lee, Moo-Young Seok, In-Chul Choi, more

Scripta Materialia > 2017 > 140 > C > 31-34

The influence of cyclic load, with the maximum stress well within the elastic regime, on the strength of nanocrystalline (nc) nickel was investigated through quasi-static compression experiments on cyclic-loaded sub-μm-sized pillars, fabricated through electron beam lithography and electroplating. Results show that prior-cycling enhances both yield and flow strengths of nc Ni without significant loss...

article

Does DHEA supplementation in IVF patients result in supraphysiological DHEA-S serum concentrations?

Albert K. Y. Tsui, Karina Rodriguez-Capote, Anna K. Füzéry, Mathew Estey, more

Journal of Assisted Reproduction and Genetics > 2017 > 34 > 7 > 957-958

An author's reply to this comment is available at http://dx.doi.org/10.1007/s10815-017-0927-1 .

article

Perception of Native English Reduced Forms in Adverse Environments by Chinese Undergraduate Students

Simpson W. L. Wong, Jenny K. Y. Tsui, Bonnie Wing-Yin Chow, Vina W. H. Leung, more

Journal of Psycholinguistic Research > 2017 > 46 > 5 > 1149-1165

Previous research has shown that learners of English-as-a-second-language (ESL) have difficulties in understanding connected speech spoken by native English speakers. Extending from past research limited to quiet listening condition, this study examined the perception of English connected speech presented under five adverse conditions, namely multi-talker babble noise, speech-shaped noise, factory...

article

Statistical analysis of the size- and rate-dependence of yield and plastic flow in nanocrystalline copper pillars

Jung-A Lee, Moo-Young Seok, Yakai Zhao, In-Chul Choi, more

Acta Materialia > 2017 > 127 > C > 332-340

The effects of specimen size and strain rate on the plastic deformation response of sub-μm-sized nanocrystalline Cu pillars were examined through a series of micro-compression experiments, with particular emphasis on the stochastic nature of the measured responses. A large number of micropillars two different diameters, both with an average grain size of 6 nm, were prepared by employing the single...

article

Experimental assessment of oxygen homeostasis during acute hemodilution: the integrated role of hemoglobin concentration and blood pressure

Tiffanie Kei, Nikhil Mistry, Albert K. Y. Tsui, Elaine Liu, more

Intensive Care Medicine Experimental > 2017 > 5 > 1 > 1-15

Background Low hemoglobin concentration (Hb) and low mean arterial blood pressure (MAP) impact outcomes in critically ill patients. We utilized an experimental model of “normotensive” vs. “hypotensive” acute hemodilutional anemia to test whether optimal tissue perfusion is dependent on both Hb and MAP during acute blood loss and fluid resuscitation, and to assess the value of direct measurements of...

article

Postfabrication Phase Error Correction of Silicon Photonic Circuits by Single Femtosecond Laser Pulses

Daniel Bachman, Zhijiang Chen, Christopher Wang, Robert Fedosejevs, more

Journal of Lightwave Technology > 2017 > 35 > 4 > 588 - 595

Phase errors caused by fabrication variations in silicon photonic integrated circuits are an important problem, which negatively impacts device yield and performance. This paper reports our recent progress in the development of a method for permanent, postfabrication phase error correction of silicon photonic circuits based on femtosecond laser irradiation. Using beam shaping technique, we achieve...

article

Influence of grain boundary modifier on the strength size-dependence displayed by complex-shaped nanocrystalline nickel pillars

Brandon B. Seo, Junhua Gu, Zeinab Jahed, Ting Y. Tsui

Thin Solid Films > 2017 > 621 > C > 178-183

Size-dependent softening characteristics of electrodeposited solid core, hollow, C-shaped, and x-shaped nanocrystalline (nc) nickel pillars with outer diameters of ~520nm were investigated by using uniaxial micro-compression techniques. Flow stress results show that only complex-shaped pillars with an average grain size of ~9.4nm prepared with saccharine containing electrolytes soften with decreasing...

article

HSP90 is a promising target in gemcitabine and 5-fluorouracil resistant pancreatic cancer

Tarik Ghadban, Judith L. Dibbern, Matthias Reeh, Jameel T. Miro, more

Apoptosis > 2017 > 22 > 3 > 369-380

Chemotherapy (CT) options in pancreatic cancer (PC) are limited to gemcitabine and 5-fluorouracil (5-FU). Several identified molecular targets in PC represent client proteins of HSP90. HSP90 is a promising target since it interferes with many oncogenic signaling pathways simultaneously. The aim of this study was to evaluate the efficacy of different HSP90 inhibitors in gemcitabine and 5-FU resistant...

article

Social Predictors of Business Student Cheating Behaviour in Chinese Societies

Anna P. Y. Tsui, H. Y. Ngo

Journal of Academic Ethics > 2016 > 14 > 4 > 281-296

Cheating is a serious issue among business students worldwide. However, research investigating the social factors that may help prevent cheating in Chinese higher education is rare. The present study examined two key social relationship factors of perceived teacher-student relationships and peer relationships by the students. It attempted to build a model which addressed the effects of two variables...

article

Interfacial Contact Effects in Top Gated Zinc Oxide Thin Film Transistors Grown by Atomic Layer Deposition

Alex M. Ma, Mei Shen, Amir Afshar, Ying Y. Tsui, more

IEEE Transactions on Electron Devices > 2016 > 63 > 9 > 3540 - 3546

Contact effects at the source/drain (S/D) electrodes in thin film transistors (TFTs) based on zinc oxide (ZnO) utilizing the top gate, bottom contact geometry are investigated using electrical and material studies. Low temperature atomic layer deposition (ALD) is employed to directly grow the ZnO active layer on Au, Ru, and TiW bottom electrodes. TFT performance varies significantly depending on the...

chapter

Post-fabrication trimming of silicon photonic circuits by femtosecond laser pulses

Daniel Bachman, Zhijiang Chen, Ying Y. Tsui, Robert Fedosejevs, more

2016 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2016 Optical Fiber Communications Conference and Exhibition (OFC)

Single femtosecond laser pulses are used to permanently change the effective index of silicon waveguides. The mechanism provides a fast, robust technique for post-fabrication tuning of silicon photonic circuits at the wafer level.

article

Multicentre prospective cohort study of body mass index and postoperative complications following gastrointestinal surgery

STARSurg Collaborative, T. M. Drake, D. Nepogodiev, S. J. Chapman, more

British Journal of Surgery > 103 > 9 > 1157 - 1172

BackgroundThere is currently conflicting evidence surrounding the effects of obesity on postoperative outcomes. Previous studies have found obesity to be associated with adverse events, but others have found no association. The aim of this study was to determine whether increasing body mass index (BMI) is an independent risk factor for development of major postoperative complications. MethodsThis...

chapter

Lattice stability in ultrafast laser excited gold

Z. Chen, Y. Tsui, V. Recoules, M. Mo, more

2016 IEEE International Conference on Plasma Science (ICOPS) > 1

2016 IEEE International Conference on Plasma Science (ICOPS)

Central to the calculation of structural, dynamical and thermal properties of matter is the interatomic potential that is little known particularly for non-simple metals under extreme conditions. A direct manifestation of interatomic potential is lattice stability that can readily be determined by observing the disassembly of an excited sample. Here we report the study of fs-laser excited Au. In our...

chapter

Deflection of laser accelerated protons from cryogenic hydrogen jets due to self-generated magnetic fields

C. B. Curry, M. Gauthier, S. Goede, J. B. Kim, more

2016 IEEE International Conference on Plasma Science (ICOPS) > 1

2016 IEEE International Conference on Plasma Science (ICOPS)

Laser-driven ion acceleration is of great interest across a range of disciplines with potential applications including the fast ignition approach to inertial confinement fusion and proton therapy. The most robust acceleration mechanisms studied to date however, based on target normal sheath acceleration (TNSA), do not satisfy the emittance, flux and ion energy requirements for direct applications.

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Search results for: Y. Tsui

Ligand Basicity and Chelate Effects on Sulfur Insertion vs. Sulfur Reduction by Zinc Thiolate Complexes

Wavefront aberrometry repeatability and agreement—A comparison between Pentacam AXL Wave, iTrace and OPD‐Scan III

Effect of in‐package atmospheric cold plasma discharge on microbial safety and quality of ready‐to‐eat ham in modified atmospheric packaging during storage

Body mass index and complications following major gastrointestinal surgery: a prospective, international cohort study and meta‐analysis

An automated quantitative DNA image cytometry system detects abnormal cells in cervical cytology with high sensitivity

Potential biomarkers of tissue hypoxia during acute hemodilutional anemia in cardiac surgery: A prospective study to assess tissue hypoxia as a mechanism of organ injury

Significant strengthening of nanocrystalline Ni sub-micron pillar by cyclic loading in elastic regime

Does DHEA supplementation in IVF patients result in supraphysiological DHEA-S serum concentrations?

Perception of Native English Reduced Forms in Adverse Environments by Chinese Undergraduate Students

Statistical analysis of the size- and rate-dependence of yield and plastic flow in nanocrystalline copper pillars

Experimental assessment of oxygen homeostasis during acute hemodilution: the integrated role of hemoglobin concentration and blood pressure

Postfabrication Phase Error Correction of Silicon Photonic Circuits by Single Femtosecond Laser Pulses

Influence of grain boundary modifier on the strength size-dependence displayed by complex-shaped nanocrystalline nickel pillars

HSP90 is a promising target in gemcitabine and 5-fluorouracil resistant pancreatic cancer

Social Predictors of Business Student Cheating Behaviour in Chinese Societies

Interfacial Contact Effects in Top Gated Zinc Oxide Thin Film Transistors Grown by Atomic Layer Deposition

Post-fabrication trimming of silicon photonic circuits by femtosecond laser pulses

Multicentre prospective cohort study of body mass index and postoperative complications following gastrointestinal surgery

Lattice stability in ultrafast laser excited gold

Deflection of laser accelerated protons from cryogenic hydrogen jets due to self-generated magnetic fields

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