Browsing by Issue Date, starting with "2020-04-28"

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Layer-Dependent and In-Plane Anisotropic Properties of Low-Temperature Synthesized Few-Layer PdSe2 Single Crystals
(2020-04-28)
Lu, Li-Syuan
;
Chen, Guan-Hao
;
Cheng, Hui-Yu
;
Chuu, Chih-Piao
;
Lu, Kuan-Cheng
Palladium diselenide (PdSe2), a peculiar noble metal dichalcogenide, has emerged as a new two-dimensional material with high predicted carrier mobility and a widely tunable band gap for device applications. The inherent in-plane anisotropy endowed by the pentagonal structure further renders PdSe2 promising for novel electronic, photonic, and thermoelectric applications. However, the direct synthesis of few-layer PdSe2 is still challenging and rarely reported. Here, we demonstrate that few-layer, single-crystal PdSe2 flakes can be synthesized at a relatively low growth temperature (300 degrees C) on sapphire substrates using low-pressure chemical vapor deposition (CVD). The well-defined rectangular domain shape and precisely determined layer number of the CVD-grown PdSe2 enable us to investigate their layer-dependent and in-plane anisotropic properties. The experimentally determined layer-dependent band gap shrinkage combined with first-principle calculations suggest that the interlayer interaction is weaker in few-layer PdSe2 in comparison with that in bulk crystals. Field-effect transistors based on the CVD-grown PdSe2 also show performances comparable to those based on exfoliated samples. The low-temperature synthesis method reported here provides a feasible approach to fabricate high-quality few-layer PdSe2 for device applications.
Sub-stoichiometric reductive etherification of carbohydrate substrates and one-pot protecting group manipulation
(2020-04-28)
Chen, Chiao Wen
;
Wang, Ching Chi
;
Li, Xin Ru
;
Witek, Henryk
;
Mong, Kwok-Kong Tony
In this study, we report a new reductive etherification procedure for protection of carbohydrate substrates and its application for one-pot preparation of glycosyl building blocks. The reported procedure features the use of polymethylhydrosiloxane (PMHS) as a sub-stoichiometric reducing agent, which prevents the transilylation side reaction and improves the efficiency of the reductive etherification method. Application of the PMHS reductive etherification procedure for one-pot protecting group manipulation are described.
Imaging and time-resolved study of laser-induced fluorescence of dysprosium atoms injected into superfluid helium
(2020-04-28)
Moroshkin, P.
;
Kono, K.
;
國際半導體學院
;
International College of Semiconductor Technology
We study the time evolution of the cloud of Dy atoms dispersed in superfluid helium and investigate the possibility of using these atoms as tracers for the imaging of superfluid-helium flows. The atoms are produced by pulsed laser ablation and are visualized via their laser-induced fluorescence. It turns out that the observation time is limited by the optical pumping of the atomic population into a nonabsorbing metastable state which is also responsible for the saturation of the fluorescence yield observed earlier.
Forming a TED talks sphere for convenient search
(2020-04-29)
Shih, Chia-Hui
;
Li, Han-Lin
;
Hu, Chih-Chien
;
Lin, Bertrand M. .
;
資訊管理與財務金融系註：原資管所+財金所
Purpose TED (Technology, Entertainment, Design, ) Talks has been one of the most popular video systems. However, the current TED Talks system expressed its inquired videos as in a two-dimensional (2D) table, which is inconvenient for searching the relationships among videos and tags. This study converts the TED Talks table into a sphere by using optimization techniques to help users search for preferred videos. Design/methodology/approach There are five phases in this study as follows. Phase 1: Reorganize data of 36 tags and 108 videos; Phase 2: Allocate tags on the TED sphere; Phase 3: Allocate videos on the TED sphere; Phase 4: Develop an online interactive TED retrieval system; and Phase 5: Perform survey and evaluation. Findings One survey demonstrated that the TED Talks sphere is more convenient for searching videos, as it is more user-friendly because of its graphical user interface, more convenient to use, more useful for retrieving information and can facilitate a more responsive search for users' preferred videos. Research limitations/implications The numbers of tags and videos able to be displayed on a sphere is limited by the capacity of an optimization software and hardware. Practical implications The proposed sphere system can be used by a large number of users of TED Talks groups. Social implications This sphere systems can also be applied to other fields which use 2D forms to display the relationships among objects. Originality/value This study uses an optimization method to convert a 2D form into a 3D sphere to highlight the relationships among numerous objects.
【生醫產業跨領域人才培育課程】聯合課程說明會
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
「插管防疫箱」獲國際肯定，茂林光電捐贈榮陽交聯盟助十大醫院
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
由陽明大學校友、現任花蓮門諾醫院麻醉科賴賢勇醫師設計的「插管防疫箱」（aerosol box），登上這個月的重量級醫學期刊《新英格蘭
Robust corrosion resistance and self-healing characteristics of a novel Ce / Mn conversion coatings on EV31 magnesium alloys
(2020-04-30)
Jian, Shun-Yi
;
Yang, Chia-Yu
;
Chang, Jun-Kai
;
交大名義發表
;
National Chiao Tung University
Magnesium alloys have been widely employed in the aerospace and aviation applications due to the unique properties. Nevertheless, Mg alloys were sensitive to corrosion attacks. The use of hexavalent chromium has been strictly banned because of severe toxicity and harm, even though it provided useful protective coating. Many efforts have been made to find the alternative process to hexavalent chromium conversion process. In this study, the Ce / Mn conversion coating was developed on EV31 Mg alloy. A thin, homogeneous, and compact conversion coating layers was formed. The electrochemical impedance spectroscopy (EIS), potentiodynamic polarization tests and salt spray test (SST) were used to evaluate the corrosion resistance of the coatings accompanying with a cross-cut scratches. The total impedance of the Ce/ Mn conversion coating rose to 2.3 x 10(3) Omega.cm(2) compared with 3.4 x 10(2) of the bare EV31. Furthermore, the Ce / Mn conversion coating passed the 168 h of SST with less than 3% corrosion area, and meanwhile the self-healing worked effectively. Both barrier protection and characteristic self-healing effect enhanced corrosion resistance on EV31. Furthermore, a corrosion mechanism for the coating in practice was proposed to discussion.
【公衛所專題演講】廢墟少年──絕望或希望？
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
陳育群老師團隊公開原始碼，協助各機關部署遠距會議平台
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
因應新冠肺炎疫情導致遠距會議需求增加，本校醫學系陳育群副教授團隊打造專屬視訊會議平台，即日起公開原始碼，無償提供給國內有
「榮陽交防疫聯盟」法律支援台耀，取得原廠授權量產瑞德西韋
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
陽明大學、交通大學與臺北榮民總醫院組成的防疫聯盟，日前已與台耀化學股份有限公司簽訂合作備忘錄。台耀化學已確定完成168公克瑞
【生藥所演講】Stress granules and longevity
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
陽明、交大率先試辦遠距醫療，隔離檢疫看病沒煩惱
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
居家隔離及檢疫民眾，萬一身體不適的時候怎麼辦？陽明大學、交通大學與部立桃園醫院的「遠距醫療解決方案」，讓這些配合防疫政策
邱士華教授團隊基因編輯技術大突破，先天性視網膜裂損症治療有望
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
先天性視網膜裂損症（X-linked juvenile retinoschisis, XLRS）是一種嚴重的視網膜退化遺傳疾病。本校藥理所邱士華教授成功以奈米
Palladium-catalyzed alpha-arylation of indolin-3-ones
(2020-04-30)
Chang, Yu-Hsuan
;
Peng, Wan-Ling
;
Chen, I-Chia
;
Hsu, Hsin-Yun
;
Wu, Yen-Ku
A method for the catalytic alpha-arylation of indolin-3-ones was developed. The catalytic system comprising Pd(dba)(2) and PAd(3) was found to be optimal for the transformation. The protocol features broad functional group compatibility in that a range of arylated indoxyl derivatives bearing a fully substituted carbon center was synthesized with high efficiency. A preliminary bioassay study revealed that the selected indole-substituted indolin-3-ones exhibit favorable cytotoxic activities against HCT-116 cancer cell line.
歡慶45周年校慶，陽明山會師大縱走
(國立陽明大學, 2020-04-30)
吳鎮全
;
陽明電子報編輯小組
由學生事務處主辦、登山社協辦的「同名計畫_陽明山會師大縱走」活動，131名師生無畏風雨於4月25日清晨，從陽明大學出發、前往陽明山。參與者分成三條路線，由不同登山口起登，11:15順利於七星山主峰上完成會師；並在郭旭崧校長領銜高喊「同名計畫」，全體參與者齊聲「2020陽明陽明」的呼聲中，將活動帶進最高潮。其中兩條路線會師後，繼續完成陽明山10連峰大縱走，為今年45周年校慶系列活動揭開序幕。
社交距離不框限心的距離
(國立陽明大學, 2020-04-30)
呂靜宜
;
陽明電子報編輯小組
【生技醫療創新創業講座】知己知彼的募資準備
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
【睡眠呼吸障礙—首創AI雲端輔診工作坊】
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
【生理醫學講座】陳培哲院士主講
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
高規格擴大慶祝，陽明45展翅飛舞
(國立陽明大學, 2020-04-30)
陽明電子報編輯小組
今年欣逢陽明創校45周年，校慶活動將以最高規格擴大慶祝！全校總動員推出9*5的繽紛多彩活動，涵蓋創校以來九大領域的五大亮點；希