Browsing by Issue Date, starting with "2018-12-18"

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Electronic structure investigation of a charge density wave coupled to a metal-to-metal transition in Ce3Co4Sn13
(2018-12-18)
Singh, A.
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Huang, H. Y.
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Chin, Y. Y.
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Liao, Y. F.
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Huang, T. C.
We study the electronic structure of the skutterudite Ce3Co4Sn13, which is known to exhibit a charge density wave (CDW) transition, at temperature T-CDW similar to 160 K, coupled to a metal-to-metal transition. We use temperature dependent hard x-ray photoemission spectroscopy (HAXPES) and x-ray absorption spectroscopy (XAS) to investigate the occupied and unoccupied electronic states of Ce3Co4Sn13. The Co 2p and Sn 3p core level spectra show small but finite shifts in binding energy positions across T-CDW while Ce 3d core level spectra do not show any change across the transition. The Ce M-4,M-5-edge XAS spectrum compared with calculations indicate a typical trivalent ionic Ce3+ spectral shape, ruling out Kondo screening in Ce3Co4Sn13. In contrast, the Co L-2,L-3-edge XAS spectrum compared with a calculated spectrum shows evidence for hybridization with neighboring Sn atoms in a trigonal prismatic co-ordination. Temperature dependent XAS across the Co L-2,L-3-edge shows a small shift across T-CDW, consistent with HAXPES results. Detailed XAS measurements as a function of temperature show that the spectral shifts occur with a hysteresis across T-CDW , indicative of a first-order transition. Valence band spectra show a normal Fermi edge above and below T-CDW. The Co 3d states are observed at a binding energy of similar to 2 eV while the Ce 4f states occur as a weak feature within 0.5 eV of the Fermi level. The results suggest an unusual CDW transition coupled to a metal-to-metal transition in Ce3Co4Sn13.
交大e-News第269期-交大六十･巨幹新枝前瞻跨領域生醫工程大樓賢齊館啟用
(2018-12-20)
國立交通大學秘書室
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Secretariat
DEVICE FOR HARVESTING AND MANAGING WIRELESS ENERGY
(2018-12-20)
YU-TE LIAO
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SHU-HSUAN LIN
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WEI-CHIH SHIH
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CHEN-YI KUO
A device for harvesting and managing wireless energy includes a wireless receiver, a first rectifier, a first capacitor, a voltage detection circuit, a first electrical switch, a second rectifier and a second capacitor connected to each other. The wireless receiver receives a wireless RF signal and converts it into an AC voltage with an input power. The first rectifier receives the AC voltage, converts it into a first DC voltage and transmits the first DC voltage to a load. The voltage detection circuit has a threshold voltage value and detects the first DC voltage. When the first DC voltage is larger than the threshold voltage value, the voltage detection circuit turns on the first electrical switch and the second rectifier receives the AC voltage through the first electrical switch to share the input power received by the first rectifier, thereby achieving the high energy conversion efficiency.
A novel nanomolar highly selective fluorescent probe for imaging mercury (II) in living cells and zebrafish
(2018-12-20)
Liu, Yen-Yu
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Naha, Sanay
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Thirumalaivasan, Natesan
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Velmathi, Sivan
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Wu, Shu-Pao
A novel fluorescent probe, PES, which contains a bisethylsulfane moiety, displayed high specificity for Hg2+ detection. With Hg2+, PES showed significant blue fluorescence enhancement, while the metal ions Al3+, Ag+, Cr3+, Ca2+, Cu2+, Co2+, Cd2+, Fe3+, Fe2+, Mn2+, Mg2+, Ni2+, Zn2+, and Pb2+ exhibited only negligible fluorescence change. PES has been found to be an effective quantitative detector (LOD, 57 nM) for Hg2+ in semi-aqueous medium based on the Hg2+-induced removal of bisethylsulfane. It resulted in a turn-on blue fluorescence response. The fluorescence enhancement induced by Hg2+ was observed over the pH range of 4-10. Our fluorescence cell-imaging experiments revealed the applicability of the new probe, PES, to be a reliable and effective fluorescent marker for Hg2+ in living cells.
Achieving highly saturated single-color and high color-rendering-index white light-emitting electrochemical cells by CsPbX3 perovskite color conversion layers
(2018-12-21)
Wang, Cheng-Ming
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Su, Yong-Ming
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Shih, Ting-An
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Chen, Guan-Yu
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Chen, Yan-Zhi
Solid-state light-emitting electrochemical cells (LECs) have been thought to be applicable for display and lighting due to their advantages such as simple device architecture, low-voltage operation and compatibility with inert cathode metals. Among the emissive materials of LECs, ionic transition metal complexes (iTMCs) exhibit relatively higher emission efficiency but they show relatively broader emission spectra, resulting in lower color saturation for display application. Here, we demonstrated that by integrating perovskite-based color conversion layers (CCLs) with blue iTMC-LECs, highly saturated green, yellow, red and deep-red and high color-rendering-index (CRI) white LECs can be obtained. The Commission Internationale de l'E'clairage (CIE) 1931 coordinates of the highly saturated single-color LECs are almost on the boundary of the National Television System Committee (NTSC) color gamut, showing their potential application in display. By mixing perovskites of different colors at an appropriate ratio in the CCLs, the white LECs show a CRI >90, which is among the highest reported values, and a correlated color temperature of 2649 K. Hence the proposed technique can also be one of the good candidates for lighting applications. In addition, both the highly saturated single-color and white LECs still exhibit efficient emission for display and lighting applications.
Can the Radical Channel Contribute to the Catalytic Cycle of N-Heterocyclic Carbene in Benzoin Condensation?
(2018-12-21)
Hsieh, Ming-Hsiu
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Huang, Gou-Tao
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Yu, Jen-Shiang K.
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交大名義發表
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生物科技學系
NHC can catalyze benzoin condensation via the key Breslow intermediate. EPR spectroscopy recently confirmed the existence of the radical species, but its catalytic role is still unclear. Herein, we use density functional approaches to study the radical-associated pathway in comparison with the nonradical mechanism reported previously. Theoretical investigations show that the nonradical path (Delta G(double dagger) = 18.7 kcal/mol) is more kinetically favorable than the radical route (Delta G(double dagger) = 27.6 kcal/mol), which is initialized by the hydrogen abstraction from the Breslow intermediate by benzaldehyde, leading to a radical pair. The product formation is thus dominated by the nonradical pathway. In addition, the Breslow intermediate is less stable than its keto form, which blocks the benzoin condensation, and the radical species could play an important role in assisting the tautomerization and promoting the catalytic reaction.
Liquid Type Nontoxic Photoluminescent Nanomaterials for High Color Quality White-Light-Emitting Diode
(2018-12-22)
Lin, Chih-Hao
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Pai, Yung-Min
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Lee, Chun-Fu
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Verma, Akta
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Lin, Huang-Yu
High-brightness white-light-emitting diodes (w-LEDs) with excellent color quality is demonstrated by using nontoxic nanomaterials. Previously, we have reported the high color quality w-LEDs with heavy-metal phosphor and quantum dots (QDs), which may cause environmental hazards. In the present work, liquid-type white LEDs composed of nontoxic materials, named as graphene and porous silicon quantum dots are fabricated with a high color rendering index (CRI) value gain up to 95. The liquid-typed device structure possesses minimized surface temperature and 25% higher value of luminous efficiency as compare to dispensing-typed structure. Further, the as-prepared device is environment friendly and attributed to low toxicity. The low toxicity and high R9 (87) component values were conjectured to produce new or improve current methods toward bioimaging application.
實習「薪」不「薪」
(2018-12-23)
林芷懷
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Department of Communication and Technology
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傳播與科技學系
實習究竟該不該給薪水，是廣受討論的議題。專法頒布後，實習生的權益是否能有更上一層的保障？
不再只有輪椅和束縛　自立支援
(2018-12-23)
林侑萱
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Department of Communication and Technology
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傳播與科技學系
隨著醫療技術的進步，台灣已經邁入老年人口達14%的高齡社會。在2026年，也將邁入老年人口比例達20%的超高齡化社會，而面對未來的老年生活，我們想要怎麼過？是只能坐在輪椅和病床，吃飯、飲食都需要旁人協助，晚上被束縛帶捆綁起來不能好好翻身？還是想要可以自己吃飯、走路、和別人聊天，過一個有尊嚴的老年生活？
點香燒金　環境的隱憂
(2018-12-23)
卓瑋哲
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Department of Communication and Technology
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傳播與科技學系
點香、燒金紙、放鞭炮是台灣長久以來的信仰風俗，隨著環保意識抬頭，漸漸地越來越多人對這些宗教活動帶來的影響產生質疑。然而全面禁止會是最好的解決方法嗎？
復古風　愛的不是古，是故事
(2018-12-23)
許柏悅
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Department of Communication and Technology
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傳播與科技學系
近年來復古風廣為流行，不僅是歐美，也跨足到了日、韓、兩岸三地，究竟是什麼特色讓「復古」如此有魅力又歷久不衰？
「性教育」你知多少？
(2018-12-23)
許家芸
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Department of Communication and Technology
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傳播與科技學系
性，在很多的文化中，往往被視為不可談的禁忌話題，可是人的終其一生，卻跟它有著密不可分的關聯。值得我們思考的是，不討論不重視，性就會不存在嗎？
生命的守護　兒童安寧療護
(2018-12-23)
林奕廷
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Department of Communication and Technology
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傳播與科技學系
人生的最後一哩路上，可不可以不要再顛簸，能不能安穩、有尊嚴地離去？這種想法的萌芽，伴隨著安寧療護的出現。安寧療護對病人來說，不僅是一種照護模式，更是提供給在醫院的病人及家屬，用另一種更好的方式，面對死亡。
永駐的愛
(2018-12-23)
李沛榆
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Department of Communication and Technology
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傳播與科技學系
小時候，是妳照顧我，現在，讓我來照顧妳。
關於我的那些　日常想像
(2018-12-23)
李庭安
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Department of Communication and Technology
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傳播與科技學系
一些我的日常想像。數篇短篇，紀錄幻想與現實之間。
大學英文畢業門檻廢存攻防
(2018-12-23)
翁邦晏
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Department of Communication and Technology
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傳播與科技學系
2018年1月，政大在校務會議上通過廢除英文畢業門檻。究竟英文畢業門檻的爭議點在哪裡、廢除的理由是什麼呢？
戴眼鏡的秘密　一起來一探究鏡
(2018-12-23)
何浚捷
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Department of Communication and Technology
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傳播與科技學系
根據研究顯示，戴眼鏡除了讓人看起來很聰明，它還隱藏著許多不為人知的小秘密。讓我們一起一探究「鏡」。
阮姿璇　小女孩追星夢轉大人
(2018-12-23)
林函諭
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Department of Communication and Technology
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傳播與科技學系
遠赴日本去實現替偶像工作夢想的台灣女孩阮姿璇，在跌跌撞撞的過程中，找到屬於自己的人生。
教育雙語化　拯救國人菜英文？
(2018-12-23)
郭玟妤
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Department of Communication and Technology
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傳播與科技學系
日前行政院長賴清德拍板「2030雙語國家政策發展藍圖」，目標十年後將台灣打造成中、英文並行的雙語國家，且將「兒童雙語教育」的實踐列為這項改革的重點項目。然而，這真的是拯救「菜英文」的根本之道嗎？
文具店裡　無與倫「筆」的美麗
(2018-12-23)
汪彥彤
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Department of Communication and Technology
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傳播與科技學系
新北市三重區一間小小文具店裡，正進行一場毛筆的文藝復興。