Time filter

Source Type

Wotango A.S.,Nanoelectrochemistry Laboratory | Su W.-N.,Graduate Institute of Applied Science and Technology | Haregewoin A.M.,Nanoelectrochemistry Laboratory | Lin M.-H.,Nanoelectrochemistry Laboratory | And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2017

Trace water content in the electrolyte causes the degradation of LiPF6, and the decomposed products further react with water to produce HF, which alters the surface of anode and cathode. As a result, the reaction of HF and the deposition of decomposed products on electrode surface cause significant capacity fading of cells. Avoiding these phenomena is crucial for lithium ion batteries. Considering the Lewis-base feature of the N-Si bond, 1-(trimethylsilyl)-imidazole (1-TMSI) is proposed as a novel water scavenging electrolyte additive to suppress LiPF6 decomposition. The scavenging ability of 1-TMSI and beneficiary interfacial chemistry between the MCMB electrode and electrolyte are studied through a combination of experiments and density functional theory (DFT) calculations. NMR analysis indicated that LiPF6 decomposition by water was effectively suppressed in the presence of 0.2 vol % 1-TMSI. XPS surface analysis of MCMB electrode showed that the presence of 1-TMSI reduced deposition of ionic insulating products caused by LiPF6 decomposition. The results showed that the cells with 1-TMSI additive have better performance than the cell without 1-TMSI by facilitating the formation of solid-electrolyte interphase (SEI) layer with better ionic conductivity. It is hoped that the work can contribute to the understanding of SEI and the development of electrolyte additives for prolonged cycle life with improved performance. © 2016 American Chemical Society.


PubMed | Taipei Hospital, Tzu Chi University, Mackay Memorial Hospital, National Taiwan University and 2 more.
Type: Journal Article | Journal: Journal of the American Heart Association | Year: 2016

The high prevalence of acute coronary syndrome (ACS) represents a significant burden on healthcare resources. A robust association exists between depression and increased morbidity and mortality after ACS. This study examined the relationship between suicide and ACS after adjusting for depression and other comorbidities.In this case-referent study conducted in Taiwan, the cases were people aged 35years or older who died from suicide between 2000 and 2012 and 4 live referents, each matched by age, sex, and area of residence. The covariates adjusted for in the analysis were sociodemographic characteristics, physical comorbidities, and psychiatric disorders. We identified 41050 persons who committed suicide and 164200 referents. In the case and referent groups, 1027 (2.5%) and 2412 (1.5%) patients had ACS, respectively. After potential confounders were adjusted, ACS was significantly associated with increased odds of suicide (aOR=1.15, 95% confidence interval [CI]=1.05-1.26). The odds of suicide were highest during the initial 6months post-ACS diagnosis (OR=3.05, 95% CI=2.55-3.65) and remained high for at least 4years after ACS diagnosis.ACS patients are at an increased risk of suicide compared with otherwise healthy people. The risk of suicide is particularly high in the 6months after ACS diagnosis. Our results suggest that we need to identify efficacious methods to recognize those at risk for suicide and to develop effective interventions to prevent such deaths.


Lin Y.-C.,Japan National Institute of Advanced Industrial Science and Technology | Komsa H.-P.,P.O. Box 11100 | Yeh C.-H.,National Tsing Hua University | Bjorkman T.,P.O. Box 11100 | And 8 more authors.
ACS Nano | Year: 2015

Rhenium disulfide (ReS2) and diselenide (ReSe2), the group 7 transition metal dichalcogenides (TMDs), are known to have a layered atomic structure showing an in-plane motif of diamond-shaped-chains (DS-chains) arranged in parallel. Using a combination of transmission electron microscopy and transport measurements, we demonstrate here the direct correlation of electron transport anisotropy in single-layered ReS2 with the atomic orientation of the DS-chains, as also supported by our density functional theory calculations. We further show that the direction of conducting channels in ReS2 and ReSe2 can be controlled by electron beam irradiation at elevated temperatures and follows the strain induced to the sample. Furthermore, high chalcogen deficiency can induce a structural transformation to a nonstoichiometric phase, which is again strongly direction-dependent. This tunable in-plane transport behavior opens up great avenues for creating nanoelectronic circuits in 2D materials. © 2015 American Chemical Society.


Lin Y.-H.,National Taiwan Normal University | Liang J.-C.,Graduate Institute of Applied Science and Technology | Tsai C.-C.,National Taiwan University of Science and Technology
American Journal of Physiology - Advances in Physiology Education | Year: 2012

The purpose of this study was to investigate students' conceptions of and approaches to learning science in two different forms: internet-assisted instruction and traditional (face-to-face only) instruction. The participants who took part in the study were 79 college students enrolled in a physiology class in north Taiwan. In all, 46 of the participants were from one class and 33 were from another class. Using a quasi-experimental research approach, the class of 46 students was assigned to be the internetassisted instruction group, whereas the class of 33 students was assigned to be the traditional instruction group. The treatment consisted of a series of online inquiry activities. To explore the effects of different forms of instruction on students' conceptions of and approaches to learning science, two questionnaires were administered before and after the instruction: the Conceptions of Learning Science Questionnaire and the Approaches to Learning Science Questionnaire. Analysis of covariance results revealed that the students in the internet-assisted instruction group showed less agreement than the traditional instruction group in the less advanced conceptions of learning science (such as learning as memorizing and testing). In addition, the internet-assisted instruction group displayed significantly more agreement than the traditional instruction group in more sophisticated conceptions (such as learning as seeing in a new way). Moreover, the internet-assisted instruction group expressed more orientation toward the approaches of deep motive and deep strategy than the traditional instruction group. However, the students in the internet-assisted instruction group also showed more surface motive than the traditional instruction group did. © 2012 The American Physiological Society.


Chen S.-H.,Graduate Institute of Applied Science and Technology | Chen H.-S.,Graduate Institute of Electro Optical Engineering | Ohta N.,Rochester Institute of Technology | Luo M.R.,University of Leeds
Journal of Imaging Science and Technology | Year: 2013

It is essential to understand preferred skin colors for color reproduction in the display industry. This article presents three psychophysical experiments that were conducted to determine the preferred skin color ranges of East Asian women by East Asian observers on the chromatic and lightness components of CIELAB color space displayed on a standard sRGB-gamut display. In the first experiment, the preferred skin color was searched using various settings of correlated color temperatures (CCTs) and luminance levels on the screen. The results indicate that the most preferred skin color on a display had small differences between various images varying in CCT and luminance level. In the second experiment, a more precise preferred skin color center was produced. The preference scores were analyzed, and the preference map of skin colors was presented on the CIELAB a*b* plane. The final experiment examined the relationship between the lightness of facial skin color and the perceived preference on a display. It was conducted to examine the effect of the lightness component on the preference of facial skin color. It was found that the (C* ab, hab) value of the most preferred skin colors of East Asian women is (25.4, 50.5), with an L * value of 65. © 2013 Society for Imaging Science and Technology.


Siriviriyanun A.,Graduate Institute of Applied Science and Technology | Imae T.,Graduate Institute of Applied Science and Technology | Imae T.,National Taiwan University of Science and Technology | Caldero G.,CSIC - Institute of Advanced Chemistry of Catalonia | Solans C.,CSIC - Institute of Advanced Chemistry of Catalonia
Colloids and Surfaces B: Biointerfaces | Year: 2014

Hydroxyl-terminated fourth generation poly(amido amine) dendrimer and folic acid were chemically bound on graphene oxide. The resultant hybrids exhibited one-photon and two-photon fluorescence emission, since the excitation irradiation at 390 and 780. nm on the hybrids brought a fluorescence emission in the visible region around 450. nm. In addition, the photocytotoxicity study revealed that under the two-photon excitation at 780. nm, the hybrids can absorb near-infrared light and generate reactive oxygen species which can oxidize the HeLa cells and cause their death, suggesting the phototherapeutic behavior. Cytotoxicity measurement revealed the high biocompatibility of the hybrids toward HeLa cells. Thus, the present biocompatible hybrids consisting of only dendrimer, folic acid and graphene oxide have potentials as photodynamic therapeutic agents for medical treatment. © 2014 Elsevier B.V.


Huang R.F.,National Taiwan University of Science and Technology | Yang H.F.,National Taiwan University of Science and Technology | Hsu C.M.,National Taiwan University of Science and Technology | Hsu C.M.,Graduate Institute of Applied Science and Technology
Journal of Propulsion and Power | Year: 2013

The flame behavior, thermal structure, and combustion product concentrations of the flames of nonpulsating and pulsating plane jets were examined and compared.Anonpulsating plane jet was modified into a pulsating plane jet by introducing the jet fluids through a jet-impingement fluidic oscillator. The flame behavior was analyzed by photographing the flame from the lateral direction and focusing on the near burner region. The flame length was taken from long-exposure photographs. The temperature and combustion product concentrations were measured by using a fine-wire thermocouple and a gas analyzer, respectively. The results showed that the pulsating jet flame is significantly shorter and wider than the nonpulsating jet flame. A difference in the flame length larger than 30% was typical. The central region temperature distributions of the pulsating jet flame presented wide plateaus of high temperatures. The maximum temperature that the pulsating jet flame may attain was higher than that of the nonpulsating jet flame by about 250°C. The pulsating jet flame presented significantly larger CO2 concentration, smaller CO concentration, and smaller unburned C3H8 than those of the nonpulsating jet flame, which implied that the combustion happening in the pulsating jet is more complete than that happening in the nonpulsating jet.


Jufar S.R.,National Taiwan University of Science and Technology | Huang R.F.,National Taiwan University of Science and Technology | Hsu C.M.,National Taiwan University of Science and Technology | Hsu C.M.,Graduate Institute of Applied Science and Technology
AIAA Journal | Year: 2013

The effects of pulsation intensity on the flow and mixing characteristics of acoustically excited swirling doubleconcentric jets were studied experimentally. The central jet was excited with various pulsation intensities. The flow evolution process, jet spread width, velocity instabilities, and jet dispersion characteristics were examined by the flow visualization, edge-detection technique, hot-wire anemometer, and tracer-gas concentration detection, respectively. As the pulsation intensity was increased over 0.16 one vortex ring was induced during each excitation cycle. This induced vortex ring evolved downstream and suddenly broke up into turbulent eddies at a distance downstream from the jet exit. The dispersion and mixing were simultaneously dominated by two mechanisms: 1) the breakup of the induced vortex ring into turbulent eddies, and 2) the near-field entrainment of the induced vortex rings. The former was more important at pulsation intensities smaller than about 0.5, whereas the latter was more prominent at pulsation intensities larger than approximately 0.5. The results of flow visualization as well as the measurements of velocity, fluctuation intensity, turbulence time and length scales, and tracer-gas-concentration distributions showed close correlations in interpreting the flow and mixing characteristics. Exciting the swirling double-concentric jets at a pulsation intensity of 1.0 might increase the mixing index by 90% over the unexcited jets. Copyright © 2013 by the American Institute of Aeronautics and Astronautics, Inc.


Chung T.-T.,Graduate Institute of Applied Science and Technology | Chung T.-T.,Tri Service General Hospital | Hueng D.-Y.,Tri Service General Hospital | Lin S.-C.,National Taiwan University of Science and Technology
Medicine (United States) | Year: 2015

This numerical study aimed to evaluate tissue and implant responses to the hybrid surgery (HS) of cervical artificial disc replacement (C-ADR) and anterior cervical discectomy and fusion (ACDF). Four hybrid strategies of two-level C-ADRandACDF were compared in terms of adjacent segment degeneration (ASD) and implant failure. The rotary C-ADR and semirigid ACDF have been extensively used in the multilevel treatment of cervical instability and degeneration, but the constrained mobility at the ACDF segments can induce postoperative ASD problems. Hybrid surgery of C-ADR and ACDF has been an alternative to provide the optimal tradeoff between surgical cost and ASD problems. The biomechanical effects of hybrid strategies warrant thorough investigation for the two-level instrumentation. Based on computed tomography imaging, a nonlinear C2-C7 model was developed and validated by cadaveric and numerical data. Four strategies of inserting the C-ADR and ACDF into the C4-C6 segments were systematically arranged as PP (2 peek cages), AA(2 artificial discs), PA, and AP. The biomechanical behavior of these 4 strategies was evaluated in terms of motion and stresses of discs, facet forces, stresses of C-ADR and ACDF, and C-ADR motion. The constrained mobility of the ACDF segment worsened the kinematic and mechanical demands of the adjacent segments and artificial discs. The C-ADR articulation provided higher mobility than the replaced disc of the intact construct, making it an effective buffer to accommodate the compensated mobility and load from the ACDF segment. Consequently, the ASD progression of the AA construct was most restricted, followed by the PA, AP, and PP construct. The PA strategy is a tradeoff to preserve mobility and reduce cost. The C-ADR of the PA construct preserves the mobility of the C5/C6 segment and shares the transferred motion and loads of the fused C4/C5 segment. The PA construct shows optimal biomechanical results for minimizing ASD and implant failure, whereas the AP strategy is only recommended when cranial degeneration is the major concern. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.


PubMed | National Taiwan University of Science and Technology, CSIC - Institute of Advanced Chemistry of Catalonia and Graduate Institute of Applied Science and Technology
Type: | Journal: Colloids and surfaces. B, Biointerfaces | Year: 2014

Hydroxyl-terminated fourth generation poly(amido amine) dendrimer and folic acid were chemically bound on graphene oxide. The resultant hybrids exhibited one-photon and two-photon fluorescence emission, since the excitation irradiation at 390 and 780nm on the hybrids brought a fluorescence emission in the visible region around 450nm. In addition, the photocytotoxicity study revealed that under the two-photon excitation at 780nm, the hybrids can absorb near-infrared light and generate reactive oxygen species which can oxidize the HeLa cells and cause their death, suggesting the phototherapeutic behavior. Cytotoxicity measurement revealed the high biocompatibility of the hybrids toward HeLa cells. Thus, the present biocompatible hybrids consisting of only dendrimer, folic acid and graphene oxide have potentials as photodynamic therapeutic agents for medical treatment.

Loading Graduate Institute of Applied Science and Technology collaborators
Loading Graduate Institute of Applied Science and Technology collaborators