Browsing by Issue Date, starting with "2019-09-23"

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Discovery of two new magnesium-bearing species in IRC+10216: MgC3N and MgC4H
(2019-09-23)
Cernicharo, J.
;
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
;
Lin, Chao-Wen
;
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
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Chang, Wei-Chiao
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Liu, Po-Tsun
;
Sze, Simon M.
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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.
十年磨一劍，陽明送出首批德國名校雙聯學位留學生
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
經過十年努力，台灣終於送出第一批德國海德堡大學雙聯學位留學生。畢業自陽明生命科學系、目前正就讀生醫光電研究所的孫一、周再...
Microstructure and mechanical properties evaluation of cathodic arc deposited CrCN/ZrCN multilayer coatings
(2019-09-30)
Huang, Sung-Hsiu
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Tong, Cheng-Yi
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Hsieh, Tsung-Eong
;
Lee, Jyh-Wei
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材料科學與工程學系
For the development of advanced nanoscale multilayer protective coatings, proper design of microstructure and chemical composition of carbon containing sequential transition metal nitride nanolayers is an important issue. In this work, five different nanostructured CrCN/ZrCN multilayer coatings were deposited periodically by cathodic arc evaporation. The bilayer period of the CrCN/ZrCN multilayer coatings was kept at 20 nm. The C2H2 gas flow ratio was adjusted from 6.3 to 20.0% for achieving CrCN/ZrCN multilayer coatings with 2.3-4.2 at.% carbon content. Nanolaminated CrCN and ZrCN nitride layers and thin amorphous carbon nitride mixed nanolayers -5 nm thick were obtained as the carbon content reached 4.2 at.%. It was found that the hardness and adhesion quality were strongly improved by the carbon addition to the CrCN/ZrCN multilayer coatings. An increase of 2.6-4.6 GPa in hardness was found for the CrCN/ZrCN multilayer coatings due to the balance of solution hardening effect of carbon atoms and the softening by the amorphous mixed nanolayer. An optimal combination of high hardness, 28.9 GPa, and good adhesion, 41 N of upper critical load were achieved when the carbon content was 4.2 at.% for the CrCN/ZrCN multilayer coatings. (C) 2019 Elsevier B.V. All rights reserved.
【真核轉錄調控50周年回顧】真核轉錄之父Robert G. Roeder演講
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
徐嘉琳副教授榮獲科技部「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
免疫反應是一個複雜又美麗精巧的系統，本校微免所徐嘉琳副教授的研究發現，異常代謝竟會造成免疫細胞的失常！這個在免疫代謝以及...
日本「重粒子醫學之父」任陽明訪問學者，培訓癌症治療人才
(國立陽明大學, 2019-09-30)
陽明電子報編輯小組
因應重粒子癌症治療引進榮陽，陽明將聘日本「重粒子醫學之父」辻井博彥教授（Prof. Hirohiko Tsujii），擔任生物醫學影像暨放射科...