Browsing by Issue Date, starting with "2020-08-13"

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Fano feature induced by a bound state in the continuum via resonant state expansion
(2020-08-13)
Pankin, Pavel S.
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Maksimov, Dmitrii N.
;
Chen, Kuo-Ping
;
Timofeev, Ivan, V
;
影像與生醫光電研究所
We consider light scattering by an anisotropic defect layer embedded into anisotropic photonic crystal in the spectral vicinity of an optical bound state in the continuum (BIC). Using a resonant state expansion method we derive an analytic solution for reflection and transmission amplitudes. The analytic solution is constructed via a perturbative approach with the BIC as the zeroth order approximation. The solution is found to describe the collapsing Fano feature in the spectral vicinity of the BIC. The findings are confirmed via comparison against direct numerical simulations with the Berreman transfer matrix method.
Attention and Functional Connectivity Among Patients With Early-Stage Subcortical Ischemic Vascular Disease and Alzheimer's Disease
(2020-08-13)
Tu, Min-Chien
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Hsu, Yen-Hsuan
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Yang, Jir-Jei
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Huang, Wen-Hui
;
Deng, Jie Fu
The current study compared attention profiles and functional connectivity of frontal regions in patients with early-stage subcortical ischemic vascular disease (SIVD) and Alzheimer's disease (AD). Twenty patients with SIVD, 32 patients with AD, and 23 subjects with normal cognition (NC) received cognition and resting-state functional MRI (rs-fMRI) evaluations. The Cognitive Abilities Screening Instrument (CASI) was used to assess global cognition, and simple attention, processing speed, divided attention, and vigilance/sustained attention were evaluated using the Digit Span Forward, Trail Making Test, Symbol Digit Modality Test, and Conners Continuous Performance Test, respectively. Voxel-based regional homogeneity (ReHo) derived from rs-fMRI data was analyzed to identify significant clusters, which were further correlated with attention profiles. Although the patients with SIVD and AD had comparable global cognitive ability, those with SIVD exhibited worse divided attention and vigilance/sustained attention than those with AD. Compared with the NC group, the patients with SIVD exhibited decreased ReHo within the right middle frontal gyrus (MFG) and left anterior cingulate gyrus (ACG), whereas the patients with AD exhibited increased ReHo within the right orbital part of frontal regions. Correlations between these three clusters with attention exhibited distinct patterns according to the dementia subtype, as did attention indices with significance in predicting global cognition. In summary, our study suggested that worse attention performance was associated with functional disconnection within the frontal regions among patients with SIVD than in those with AD. Frontal functional disconnection may underlie the pathogenesis responsible for defective divided attention, vigilance/sustained attention, and notable within-group variations identified in SIVD.
Giant photothermal nonlinearity in a single silicon nanostructure
(2020-08-14)
Duh, Yi-Shiou
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Nagasaki, Yusuke
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Tang, Yu-Lung
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Wu, Pang-Han
;
Cheng, Hao-Yu
Silicon photonics have attracted significant interest because of their potential in integrated photonics components and all-dielectric meta-optics elements. One major challenge is to achieve active control via strong photon-photon interactions, i.e. optical nonlinearity, which is intrinsically weak in silicon. To boost the nonlinear response, practical applications rely on resonant structures such as microring resonators or photonic crystals. Nevertheless, their typical footprints are larger than 10 mu m. Here, we show that 100nm silicon nano-resonators exhibit a giant photothermal nonlinearity, yielding 90% reversible and repeatable modulation from linear scattering response at low excitation intensities. The equivalent nonlinear index is five-orders larger compared with bulk, based on Mie resonance enhanced absorption and high-efficiency heating in thermally isolated nanostructures. Furthermore, the nanoscale thermal relaxation time reaches nanosecond. This large and fast nonlinearity leads to potential applications for GHz all-optical control at the nanoscale and super-resolution imaging of silicon.
Direct large-area growth of graphene on silicon for potential ultra-low-friction applications and silicon-based technologies
(2020-08-14)
Tseng, Wei-Shiuan
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Chen, Yen-Chun
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Hsu, Chen-Chih
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Lu, Chen-Hsuan
;
Wu, Chih-, I
Deposition of layers of graphene on silicon has the potential for a wide range of optoelectronic and mechanical applications. However, direct growth of graphene on silicon has been difficult due to the inert, oxidized silicon surfaces. Transferring graphene from metallic growth substrates to silicon is not a good solution either, because most transfer methods involve multiple steps that often lead to polymer residues or degradation of sample quality. Here we report a single-step method for large-area direct growth of continuous horizontal graphene sheets and vertical graphene nano-walls on silicon substrates by plasma-enhanced chemical vapor deposition (PECVD) without active heating. Comprehensive studies utilizing Raman spectroscopy, x-ray/ultraviolet photoelectron spectroscopy (XPS/UPS), atomic force microscopy (AFM), scanning electron microscopy (SEM) and optical transmission are carried out to characterize the quality and properties of these samples. Data gathered by the residual gas analyzer (RGA) during the growth process further provide information about the synthesis mechanism. Additionally, ultra-low friction (with a frictional coefficient similar to 0.015) on multilayer graphene-covered silicon surface is achieved, which is approaching the superlubricity limit (for frictional coefficients <0.01). Our growth method therefore opens up a new pathway towards scalable and direct integration of graphene into silicon technology for potential applications ranging from structural superlubricity to nanoelectronics, optoelectronics, and even the next-generation lithium-ion batteries.
Realizing a Cosolvent System for Stable Tin-Based Perovskite Solar Cells Using a Two-Step Deposition Approach
(2020-08-14)
Shahbazi, Saeed
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Li, Meng-Yu
;
Fathi, Amir
;
Diau, Eric Wei-Guang
;
交大名義發表
Applying a two-step procedure and solvent engineering, we fabricated a stable tin-based perovskite, formamidinium tin triiodide (FASnI(3)), solar cell for lead-free photovoltaic applications. The first step was deposition of a SnI2 layer with the solvent dimethyl sulfoxide; the second step was application of a cosolvent system containing hexafluoro-2-propanol (HFP), isopropyl alcohol (IPA), and chlorobenzene (CB) in a 5:5:2 ratio to deposit the FAI layer on the SnI2 layer. The traditional IPA solvent prevented the formation of a stable FASnI(3) layer such that a stable device could not be fabricated. HFP was hence used to form hydrogen bonds with IPA and FM to retard the crystal growth of FASnI(3); CB served as the antisolvent. Ethylenediammonium dihypophosphite in the first step was an effective reducing agent to increase the efficiency of power conversion from similar to 5% to similar to 7% with great reproducibility and stability over 4000 h.
【實驗場所職業安全衛生教育訓練】
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
為提昇校園實驗場所安全衛生觀念，降低災害風險，加強實驗場所.
【IRB教育訓練Ｉ】醫療器材法規與管理制度簡介
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
日期：8月31日（一）時間：18:00-21:00（IRB時數：3）
陽明輔具中心主辦，2020全球首發輔具長照大展
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
由陽明「ICF暨輔助科技研究中心」與展昭國際公司共同主辦的「2020臺灣長期照護大展」，7月30日至8月2日在台北南港展覽館盛大登場..
陽明深耕創客教育，「3D列印工程師」認證率全國最高
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
今年「經濟部3D列印工程師」第一次認證考試，全國共有613人報考、獲證率僅3成。陽明「3D列印工程師認證班」考生獲證率卻高達七成...
陽明攜手醫療財經專家，探討新冠病毒對策
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
新冠病毒疫情為全世界帶來巨大衝擊，各國紛紛祭出因應對策。陽明大學防疫科學研究中心與台灣經濟學會、臺灣大學社會科學院，7月30.
《小丑》（Joker）
(國立陽明大學, 2020-08-15)
黃柏威
;
陽明電子報編輯小組
Oriented Si3N4 crystallites formed by plasma nitriding of SiO2/Si (111) substrate
(2020-08-15)
Yu, Chang-Hua
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Chiu, Kun-An
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Do, Thi-Hien
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Chang, Li
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材料科學與工程學系
We show that formation of oriented Si3N4 crystallites can be obtained by plasma nitriding of 20 nm thick SiO2 amorphous layer on Si (111) wafer. Nitriding is achieved at temperature in the range of 800-1000 degrees C with microwave plasma using gas mixture of N-2 and H-2. Results of x-ray diffraction and Raman spectroscopy show that both alpha-Si3N4 and beta-Si3N4 are formed on the nitrided substrate and are strongly oriented in {1 (1) over bar 00} for both phases. The morphologies of the nitrided surfaces as shown by scanning electron microscopy exhibit elongated Si3N4 crystallites aligned with Si < 110 >. Cross-sectional transmission electron microscopy image reveals that the Si3N4/Si interface is sharp without residual SiO2.
生化所王琬菁副教授榮獲科技部「吳大猷先生紀念獎」
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
「中心體纖毛複合體」是細胞不可或缺的構造，其結構或功能的異常會造成纖毛性病變，然而相關的分子機制至今仍有許多重要的議題未
【一般場所職業安全衛生教育訓練】
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
健康是人類幸福的基礎，人必須在生理、心理、社會方面達到基本
Hydrogel-based zinc ion sensor on optical fiber with high resolution and application to neural cells
(2020-08-15)
Tsai, May-Jywan
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Cheng, Henrich
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Ho, Hsin-Hsien
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Lin, Peng-Wei
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Liou, Dann-Ying
Solid-state zinc ion sensor is developed with high enough resolution and reproducibility for the potential application in brain injury monitoring. An optical diffuser is incorporated into the zinc ion sensor based on optical fiber and hydrogel doped with the fluorescent zinc ion probe molecule meso-2,6-Dichlomphenyltripyrrinone (TPN-Cl-2). The diffuser transforms the high-peak-intensity excitation light near the fiber end into a broad light with moderate local intensity to reduce the degradation of the probe molecule. Reversible detection can be reached for 1, 2, and 5 mu m (10(-6) Molar), with slopes 0.3, 0.6, and 0.8 respectively. This is the pathophysiological concentration range after brain injury. The sensor is applied to neuron-glial cultures and macrophage under the stimulation of lipopolysaccharide (LPS), KCl and oxygen/glucose deprivation (OGD) that reflect inflammation, depolarization and ischemia respectively, mimicking events after brain injury. The zinc ion level is raised to 4-5 mu m after LPS treatment, and then reduced to <3 mu m after the co-treatment with the herbal drug silymarin. The results suggest the conditions of the neural cells under stress can be monitored.
陽明防疫中心全球大數據研究：新冠肺炎死亡率與檢測數及政府效能相關
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
新冠肺炎在全球已造成超過1500萬人感染，超過60萬人死亡。面臨全球感染人數及死亡人數屢創新高，台灣也可能面對疫情再次來襲的風
Low temperature deposition of high quality single crystalline AlN thin films on sapphire using highly oriented monolayer MoS 2 as a buffer layer
(2020-08-15)
Chien, Hung-Yi
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Kuo, Po-Chun
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Kao, Hui-Ling
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Chen, Jyh-Shin
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Chen, Meei-Ru
從生物藝術到科技藝術──「藝文中心」下學期活動預告
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
生物藝術展十月「基因丶進化丶革命：生物藝術展」(Genetic (R)evolution: BioArt Exhibition)，將聚焦於探討生物藝術中基因改造科技丶進化論述和革命的關係。由視覺文化所勞維俊老師擔任策展人，𨘋請多位國內外知名的年輕藝術家及團體，展出他們精選的生物藝術作品，透過這些作品，強調生命科學丶生醫工程丶科技丶哲學等各學科與藝術間互相拉鋸與又融合的關係。
Dynamic brain connectivity attuned to the complexity of relative clause sentences revealed by a single -trial analysis
(2020-08-15)
Xu, Kunyu
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Wu, Denise H.
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Duann, Jeng-Ren
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教育研究所
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Institute of Education
【2020陽明交大生物科技與藥物發展研討會】
(國立陽明大學, 2020-08-15)
陽明電子報編輯小組
本研討會由國立陽明大學藥物科學院、生命科學院及國立交通大學生物科技學院共同主辦，希望藉由本研討會的舉辦，讓兩校不同領域...