Browsing by Issue Date, starting with "2019-09-20"

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Controlling the electrostatic interaction using a thermal signal to structurally change thermoresponsive nanoparticles
(2019-09-20)
Akimoto, Jun
;
Lin, Hsiu-Pen
;
Li, Yaw-Kuen
;
Ito, Yoshihiro
;
應用化學系
The negatively charged thermoresponsive polymers poly(benzyl methacrylate)-b-poly(acrylic acid)-b-poly(N-isopropylacrylamide) (PBzMA-b-PAAc-b-PIPAAm) were prepared by reversible-addition fragmentation chain transfer polymerization. The polymer formed core-shell polymeric micelles possessing a thermoresponsive corona composed of PAAc-b-PIPAAm below the lower critical solution temperature (LCST) of the PIPAAm chain. The nonionic thermoresponsive polymeric micelle composed of PBzMA-b-PIPAAm exhibited extensive intermicellar aggregation after the hydrophobic phase transition of the corona-forming PIPAAm chains. In contrast, insertion of the PAAc chain into the thermoresponsive micelle maintained its dispersibility above the LCST of PIPAAm because of the electrostatic repulsion between the micelles. The micelles with short PAAc chains suppressed the effect of the negative charge derived from PAAc below the LCST because of the extended PIPAAm chain on the micellar surface. In contrast, the negative charge property appeared due to collapse of the PIPAAm layer above the LCST. This thermoresponsive change in its electrostatic behavior enables the micelle to control the adsorption and desorption of oppositely charged molecules in response to the temperature change across the LCST.
Electrochemically active novel amorphous carbon (a-C)/Cu3P peapod nanowires by low-temperature chemical vapor phosphorization reaction as high efficient electrocatalysts for hydrogen evolution reaction
(2019-09-20)
Manikandan, Arumugam
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Sriram, Pavithra
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Hsu, Kun-Chieh
;
Wang, Yi-Chung
;
Chen, Chia-Wei
Toward finding low-cost electrocatalysts with high catalytic properties to replace noble metals as high efficient electrocatalysts in electrochemical hydrogen evolution reaction (HER) of total water splitting plays a vital role to approach the green and sustainable energy supply. Here, we demonstrate the direct growth of novel copper phosphide coated with amorphous carbon, namely heterostructured a-C/Cu3P peapod nanowires from chemically synthesized copper nanowires (Cu NWs) followed by a chemical vapor phosphorization reaction (CVPR) process at a low temperature of 400 degrees C. The heterostructured a-C/Cu3P peapod nanowires exhibit a superior electrocatalytic activity by a lower overpotential of 287 mV at a current density of 10 mA cm(-2) with a low Tafel slope of 72 mV dec(-1) and excellent stability over 1000 cycles. The superior electrocatalytic performance can be explained by the superior contact of the electrolyte with active sites on the heterostructured a-C/Cu3P due to the high surface area of peapod nanowire structure covered by defective edges of graphene with the encapsulated amorphous carbon layer, which can tremendously enhance electrical conductivity at the surface. (C) 2019 Published by Elsevier Ltd.
活化教育專業知識之教學實踐研究計畫
(2019-09-20)
陳鏗任
;
國立交通大學教育研究所
本計畫以兩學期的時間，考慮不同課程特性與過去兩年教學所遇之挑戰，活化教學策略，精進教育類課程的學習體驗，以達到活化師資培育教學的創新目標：1. 教育基礎課程（教育哲學）：導入學思達教學法培養師資生批判思考與表達自身教育理念，輔以數位閃示卡之使用強化師資生知識基礎。2. 教師專業課程（教育研究法、教育統計學）：運用翻轉教室，將研究所層級的方法基礎課程融入實務元素。3. 教育方法課程（學習與閱讀理解策略、差異化教學）：以小組合作與展演，輔以同儕回饋，培養師資生應用多元教學方法與學習策略之技能。計畫主持人共完成54之教學影片、在五門課程中導入四種創新教法，並於報告末提出五個重要的教學設計原則，提供未來教授教育學科的教師參考。應用此五項原則，可以有效活化教育專業知識，讓學理貼近專業實務。
A quadrupole ion trap mass spectrometer for dry microparticle analysis
(2019-09-21)
Ozdemir, Abdil
;
Lin, Jung-Lee
;
Gulfen, Mustafa
;
Hsiao, Chun-Jen
;
Chen, Chung-Hsuan
In this work, we report a new design of a charge detection quadrupole ion trap mass spectrometer (QIT-MS) for the analysis of micro-sized dry inorganic and bioparticles including red blood cells (RBCs) and different sizes of MCF-7 breast cancer cells. The developed method is one of the fastest methods to measure the mass of micro-sized particles. This system allows the online analysis of various micro-sized particles up to 1 x 10(17) Da. The calibration of the mass spectrometer has been done by using different sizes of polystyrene (PS) particles (2-15 mu m). The measured masses of RBCs were around 1.8 x 10(13) Da and MCF-7 cancer cells were between 1 x 10(14) and 4 x 10(14) Da. The calculated mass distribution profiles of the particles and cells were given as histogram profiles. The statistical data were summarized after Gaussian type fitting to the experimental histogram profiles. The new method gives very promising results for the analysis of particles and has very broad application.
Tailoring fluorescence emissions, quantum yields, and white light emitting from nitrogen-doped graphene and carbon nitride quantum dots
(2019-09-21)
Gu, Siyong
;
Hsieh, Chien-Te
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Gandomi, Yasser Ashraf
;
Li, Jianlin
;
Yue, Xing Xing
Highly fluorescent N-doped graphene quantum dots (NGQDs) and graphitic carbon nitride quantum dots (CNQDs, g-C3N4) were synthesized using a solid-phase microwave-assisted (SPMA) technique. The SPMA method, based on the pyrolysis of citric acid and urea with different recipes, is capable of producing quantum dots with coexisting NGQDs and CNQDs at 280 degrees C within only five minutes. The photoluminescence (PL) emissions from NGQD and CNQDs are strongly dependent on the excitation wavelength and the solvent type, i.e., water, ethanol, and N-methyl pyrrolidinone. The unique attribute of the quantum dots, possessing a multiple chromophoric band-gap structure, originates from the presence of g-C3N4, defect-related emissive traps, and grain boundaries. Thus, an appropriate excitation wavelength induces a conjugated pi electron system to fulfill the most probable absorption band, resulting in wavelength-dependent emissions including ultraviolet, visible and infrared light. The quantum yield of the NGQD and CNQD samples can reach as high as 68.1%. Accordingly, a light-emitting device using the combination of the NGQD and CNQD powder embedded polymeric film can emit white-like light with ultra-high power-conversion efficiency.
Discovery of two new magnesium-bearing species in IRC+10216: MgC3N and MgC4H
(2019-09-23)
Cernicharo, J.
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Cabezas, C.
;
Pardo, J. R.
;
Agundez, M.
;
Bermudez, C.
We report on the detection of two series of harmonically related doublets in IRC +10216. From the observed frequencies, the rotational constant of the first series is B = 1380.888 MHz and that of the second series is B = 1381.512 MHz. The two series correspond to two species with a (2)Sigma electronic ground state. After considering all possible candidates, and based on quantum chemical calculations, the first series is assigned to MgC3N and the second to MgC4H. For the latter species, optical spectroscopy measurements support its identification. Unlike diatomic metal-containing molecules, the line profiles of the two new molecules indicate that they are formed in the outer layers of the envelope, as occurs for MgNC and other polyatomic metal-cyanides. We also confirm the detection of MgCCH that was previously reported from the observation of two doublets. The relative abundance of MgC3N with respect to MgNC is close to one while that of MgC4H relative to MgCCH is about ten. The synthesis of these magnesium cyanides and acetylides in IRC +10216 can be explained in terms of a two-step process initiated by the radiative association of Mg+ with large cyanopolyynes and polyynes followed by the dissociative recombination of the ionic complexes.
Incidence of retinal vein occlusion with longterm exposure to ambient air pollution
(2019-09-24)
Zhang, Han-Wei
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Lin, Chao-Wen
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Kok, Victor C.
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Tseng, Chun-Hung
;
Lin, Yuan-Pei
This study aimed to investigate whether long-term exposure to airborne hydrocarbons, including volatile organic compounds, increases the risk of developing retinal vein occlusion (RVO) among the population of Taiwan. A retrospective cohort study involving 855,297 people was conducted. Cox proportional hazards regression analysis fitted the multiple pollutant models for two targeted pollutants, including total hydrocarbons (THC), nonmethane hydrocarbons (NMHC) were used, and the risk of RVO was estimated. The chi-squared test and one-way analysis of variance were used to test differences in demographics and comorbidity distribution among tertiles of the targeted pollutants. Before controlling for multiple pollutants, hazard ratios for the overall population were 19.88 (95% CI: 17.56-22.50) at 0.51-ppm increases in THC and 4.33 (95% CI: 3.97-4.73) at 0.27-ppm increases in NMHC. The highest adjusted hazard ratios for different multiple pollutant models of each targeted pollutant were statistically significant (all p values were.0.05) for all patients at 29.67 (95% CI: 25.57-34.42) for THC and 16.24 (95% CI: 14.14-18.65) for NMHC. Our findings suggest that long-term exposure to THC and NMHC contribute to RVO development.
Heteroepitaxy of Co-Based Heusler Compound/Muscovite for Flexible Spintronics
(2019-09-25)
Chen, Yi-Cheng
;
Yen, Min
;
Lai, Yu-Hong
;
Markou, Anastasios
;
Zhang, Liguo
Materials with high spin-polarization play an important role in the development of spintronics. Co-based Heusler compounds are a promising candidate for practical applications because of their high Curie temperature and tunable half-metallicity. However, it is a challenge to integrate Heusler compounds into thin film heterostructures because of the lack of control on crystallinity and chemical disorder, critical factors of novel behaviors. Here, muscovite is introduced as a growth substrate to fabricate epitaxial Co2MnGa films with mechanical flexibility. The feature of heteroepitaxy is evidenced by the results of X-ray diffraction and transmission electron microscopy. Moreover, high chemical ordering with superior properties is delivered according to the observation of large Hall conductivity (680 Omega(-1) cm(-1)) and highly saturated magnetic moment (similar to 3.93 mu(B)/f.u.), matching well with bulk crystals. Furthermore, the excellence of magnetic and electrical properties is retained under the various mechanical bending conditions. Such a result suggests that the development of Co2MnGa/muscovite heteroepitaxy provides not only a pathway to the thin film heterostructure based on high-quality Heusler compounds but also a new aspect of spintronic applications on flexible substrates.
The impact of heterogeneous anisotropy of porous media on density-driven convection
(2019-09-26)
Li, Qian
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Cai, Weihua
;
Tang, Xiaojing
;
Chen, Yicheng
;
Li, Bingxi
Purpose The aim of this study is to numerically simulate the density-driven convection in heterogeneous porous media associated with anisotropic permeability field, which is important to the safe and stable long term CO2 storage in laminar saline aquifers. Design/methodology/approach The study uses compact finite difference and the pseudospectral method to solve Darcy's law. Findings The presence of heterogeneous anisotropy may result in non-monotonic trend of the breakthrough time and quantity of CO2 dissolved in the porous medium, which are important to the CO2 underground storage. Originality/value The manuscript numerically study the convective phenomena of mixture contained CO2 and brine. The phenomena are important to the process of CO2 enhanced oil recovery. Interesting qualitative patterns and quantitative trends are revealed in the manuscript.
陳世彬教授榮獲科技部「吳大猷先生紀念獎」
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
本校臨床醫學研究所陳世彬教授針對最嚴重也最危險的頭痛「RCVS」，以及造成全世界最多人失能的神經科疾病「偏頭痛」，深入進行病...
社團博覽會暨迎新晚會，熱烈歡迎新鮮人
(國立陽明大學, 2019-09-30)
董芷伶
;
陽明電子報編輯小組
一年一度的社團博覽會於9月4 日、5日兩天舉行，第一天共有41個社團攤位、3個校隊攤位參加，幾乎陽明所有社團全員出動！「社團博覽會」是由課外活動輔導組和學生會共同策劃，提供社團設攤招生、宣傳的活動。活動對象主要是新生，故以往都在新生入學指導的第二天舉辦。今（108）年由於新生入學日程改制，社團博覽會改於入學典禮前日（9/4）及當日（9/5）舉辦。
陽明成立「健康一體研究中心」，推動台灣防疫戰略
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
為協助台灣發展人類－動物－環境「健康一體」（One Health）防疫戰略，陽明率國內之先，9月24日成立「健康一體研究中心」，將與國...
【10月份生技咖啡館】握手之約的背後故事
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
【創新育成中心20週年慶暨畢業廠商回娘家】
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
【2019視覺社會史/學系列演講Ｉ】醫學圖像中的身體與文化
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
【健康講座】迎接生命中的戀情
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
山腰的十帖心靈處方
(國立陽明大學, 2019-09-30)
呂靜宜
;
陽明電子報編輯小組
知行良師，教輔典範──知行樓優化啟用暨優良教師頒獎典禮
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
為表達對老師們的感謝及表揚107學年度教學傑出教師、優良導師，同時慶祝「知行樓」後棟優化後啟用，學務處與教務處9月25日中午在...
【職場軟實力系列講座】職涯新視野～開啟國際遊留學之窗
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
Investigation of resistive switching in copper/InGaZnO/Al2O3-based memristor
(2019-09-30)
Gan, Kai-Jhih
;
Chang, Wei-Chiao
;
Liu, Po-Tsun
;
Sze, Simon M.
;
電子工程學系及電子研究所
This work investigates the resistive switching mechanism in the Cu/TiW/InGaZnO/Al2O3/Pt-based memristor. By introducing the Al2O3 layer, the nanoscale diameter of the Cu filament decreased from 6.51 to 0.83 nm as the current compliance decreases from 1 mA to 50 mu A. The resistive switching memory characteristics, such as a large ratio of high-resistance state (HRS)/low-resistance state (LRS) (similar to 10(7)), stable switching cycle stability (>9 x 10(2)), and multilevel operation, are observed and apparently improved compared to the counterpart of the Cu/TiW/InGaZnO/Pt memory device. These results are attributed to the control of Cu formation/dissolution by introducing the Al2O3 nanolayer at the InGaZnO/Pt interface. The findings of this study can not only improve the performance of the amorphous InGaZnO memristor but also be promising for potential applications of next-generation flat-panel displays in wearable devices.