Browsing by Issue Date, starting with "2019-12-09"

Now showing 1 - 20 of 6168

Photon recycling characteristics of InGaAs/GaAsP multiple quantum well solar cells incorporating a spectrally selective filter and distributed Bragg reflector
(2019-12-09)
Hong, Chung-Yu
;
Wang, Yi-Chin
;
Su, Yu-Chih
;
Tsai, Jia-Ling
;
Tung, Chao-Ming
Photon management plays a vital role in the power conversion efficiency of III-V semiconductor solar cells. However, the photon recycling characteristics of GaAs-based multi-quantum-well (MQW) solar cells employed different optical designs had yet been fully explored. In this work, we investigate the impact of the spectrally selective filter (SSF) and distributed Bragg reflector (DBR) on the photovoltaic characteristics of single-junction, strain-balanced In0.1Ga0.9As/ GaAs0.85P0.15 MQW solar cells. Specifically, the SSFs with cutoff wavelengths of 880, 910, and 940 nm are designed and implemented on MQW solar cells with and without the incorporation of a rear DBR. Photon confinement in the vertical direction is verified based on the characterizations of reflectance, electroluminescence, and external quantum efficiency. We show that the photon confinement reduces the saturation current density, up to 26 times and 3 times for the 880 nm SSF-MQW and SSF-MQW-DBR devices, respectively, compared to that of the 940 nm devices. Furthermore, by comparing the SSF-MQW-DBR solar cells under simulated one-sun and concentrated illumination conditions, the open-circuit voltage exhibits a maximal net increase for the 910 nm SSF due to tradeoff between the short-circuit and saturation current density. The proposed SSF design may offer a viable approach to boost the performance of GaAs-based MQW solar cells. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Heat dissipation in quasi-ballistic single-atom contacts at room temperature
(2019-12-10)
Tsutsui, Makusu
;
Chen, Yu-Chang
;
交大名義發表
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電子物理學系
;
National Chiao Tung University
We report on evaluations of local heating in Au single-atom chains at room temperature. We performed onsite thermometry of atomic-scale Au junctions under applied sinusoidal voltage of variable amplitudes. The AC approach enabled to preclude electromigration effects for characterizing the influence of energy dissipations on the lifetime. We elucidated nonlinear increase in the effective temperature of the current-carrying single-atom chains with the voltage amplitudes, which was attributed to subtle interplay between electron-phonon scattering and electron-mediated thermal transport in the quasi-ballistic conductor. We also found that only 0.2% of the electric power contributed to local heating while the majority was consumed at the diffusive bank. The present findings can be used for thermal management of future integrated nanoelectronics.
Iron embedded magnetic nanodiamonds for in vivo MRI contrast enhancement
(2019-12-11)
Lin, Bo-Rong
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Chen, Chien-Hsu
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Chang, Chun-Hsiang
;
Kunuku, Srinivasu
;
Chen, Tzung-Yuang
Although nanodiamonds have long being considered as a potential tool for biomedical research, the practical in vivo magnetic resonance imaging (MRI) application of nanodiamonds remains relatively unexplored. In this paper, we present the first application of in vivo MRI contrast enhancement using only iron embedded magnetic nanodiamonds. An MR image enhancement was clearly demonstrated in the rendering of T2-weighted images of mice obtained using an unmodified commercial MRI scanner. The excellent contrast obtained using these nanodiamonds opens the door to the non-invasive in vivo tracking of nanodiamonds and image enhancement. In the future, one can apply these magnetic nanodiamonds together with surface modifications to facilitate drug delivery, targeted therapy, localized thermal treatment, and diagnostic imaging.
Antiferroelectric antiferromagnetic type-I multiferroic Cu9O2(SeO3)(4)Cl-6
(2019-12-11)
Wu, H. C.
;
Denisova, K. N.
;
Menzel, D.
;
Kakarla, D. Chandrasekhar
;
Maximova, O. V.
We report that Cu9O2(SeO3)(4)Cl-6 is a new multiferroic compound. Comprehensive studies of this compound have been carried out on single crystals as well as polycrystalline samples. Magnetic susceptibility chi and specific heat C with H parallel to c axis both reveal an anomaly at T-N = 37 K associated with the long-range antiferromagnetic order. However, no signature of this phase transition is seen with the H parallel to b axis, providing evidence of the anisotropic nature of its magnetic properties. The results of chi measurements are consistent with the temperature evolution of the intensity of magnetic reflections from the neutron diffraction experiments. The magnetic structure derived from neutron scattering measurements shows that half of the Cu(5) ions carry no moments. Furthermore, an anomaly in the dielectric constant near T-N and observable magnetoelectric coupling below T-N are found. At high temperatures, a dielectric peak at T-E = 267 K is identified with no measurable spontaneous polarization below T-E, thereby suggesting an antiferroelectric order. A steplike anomaly seen in chi(T) at T-E hints the weak spin-lattice coupling. Concomitantly, high-resolution temperature-dependent synchrotron x-ray diffraction experiments elucidate a local structural distortion at T-E.
【12月山腰電影院】
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
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(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
慈青社X綠色創客X軍訓室，拒菸反毒環保淨山
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
總算從期中考試的桎梏中解脫，同學們紛紛放鬆身心，踴躍參加身邊的活動。11月16日就是慈青社與陽明綠色創客社和軍訓室聯合舉辦的...
黃瑋傑星光音樂會與《樂生捷運》紀錄片放映
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
配合【樂生在陽明－醫病、生活文物展】，藝文中心在11月舉辦了音樂會和紀錄片放映，希望藉由邀請不同領域、用不同方式關注樂生議題的人們來到陽明，讓同學可以從不一樣的角度去思考樂生。
【生醫資訊學術演講】普度大學陸永祥教授主講：一個研究計畫誕生的故事
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
校園轉型正義首例，醫學系唐心北校友獲平反
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
本校「學生獎懲委員會」12月2日臨時會議全數一致通過，應以修復式轉型正義之精神，予以撤銷醫學系第四屆唐心北校友於民國73年所受...
陽明尖端人工智慧，獲「未來科技展」最佳人氣技術獎
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
針對精神疾病只能透過醫師問診，缺乏客觀診斷標準，陽明腦科學研究所開發出人工智慧腦影像分析平台，讓精神疾病有了客觀的診斷依...
李美璇老師團隊與美國衛院合作，發現12種金屬與膽囊癌顯著相關
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
膽囊是人體重要消化器官，台灣每年約有千人罹患膽囊癌，但國內幾乎沒有針對膽囊癌的相關研究。陽明臨床醫學研究所李美璇副教授，...
《日常對話》（Small Talk）
(國立陽明大學, 2019-12-13)
黃柏威
;
陽明電子報編輯小組
【生物醫學學術演講】李友專院長：醫療人工智慧之「先覺醫療」
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
蔡金吾老師團隊再獲「李天德醫藥科技獎」肯定
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
本校腦科所蔡金吾老師團隊運用跨領域尖端技術，研究小兒神經發育疾病之基因突變、致病機轉與精準醫療，領先全球的傑出研究成果屢...
【醫技系學術專題演講】
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
【公費流感疫苗在校施打】
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
醫學校院長齊聚陽明，發表六年制首屆學習成果
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
「第68次全國公私立醫學院校院長會議」11月29日於本校守仁樓膺才廳舉行。會中，「新制醫學系工作小組」召集人張上淳副校長說明，...
【醫者如是－金鏗年教授紀念展】
(國立陽明大學, 2019-12-13)
陽明電子報編輯小組
氣候全球拉警報！別再覺得不差你一個！
(2019-12-15)
鄧萱妤
;
Department of Communication and Technology
;
傳播與科技學系
【地球只有一個】專題

氣候已經不只是變遷，而是我們正處於氣候緊急狀態。2020年可以是危機、可以是轉機，以下將帶您了解，為何氣候告急、受災國正遭受什麼樣的困境，以及我們可以如何做出改變，又可以如何影響政治意識改變。