Browsing by Issue Date, starting with "2015-12-21"

Now showing 1 - 20 of 20061

Black hole remnant in asymptotic anti-de Sitter space
(2015-12-21)
Wen, Wen-Yu
;
Wu, Shang-Yu
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電子物理學系
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Department of Electrophysics
The solution of a remnant was suggested for the black hole ground state after surface gravity is corrected for the loop quantum effect. On the other hand, a Schwarzschild black hole in asymptotic anti-de Sitter space would tunnel into the thermal soliton solution known as the Hawking-Page phase transition. In this letter, we investigate the low temperature phase of a three-dimensional Banados-Teitelboim-Zanelli (BTZ) black hole and four-dimensional AdS Schwarzschild black hole. We find that the thermal soliton is energetically favored rather than the remnant solution at low temperature in three dimensions, while a Planck-size remnant is still possible in four dimensions. Though the BTZ remnant seems energetically disfavored, we argue that it is still possible to find in the overcooled phase if strings were present, and its implication is discussed.
A stochastic simulation method for the assessment of resistive random access memory retention reliability
(2015-12-21)
Berco, Dan
;
Tseng, Tseung-Yuen
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
This study presents an evaluation method for resistive random access memory retention reliability based on the Metropolis Monte Carlo algorithm and Gibbs free energy. The method, which does not rely on a time evolution, provides an extremely efficient way to compare the relative retention properties of metal-insulator-metal structures. It requires a small number of iterations and may be used for statistical analysis. The presented approach is used to compare the relative robustness of a single layer ZrO2 device with a double layer ZnO/ZrO2 one, and obtain results which are in good agreement with experimental data. (C) 2015 AIP Publishing LLC.
交大e-News第200期-頒授廣達電腦梁次震副董事長、翁山蘇姬女士名譽博士學位
(2015-12-21)
國立交通大學秘書室
;
Secretariat
A stochastic simulation method for the assessment of resistive random access memory retention reliability
(2015-12-21)
Berco, Dan
;
Tseng, Tseung-Yuen
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This study presents an evaluation method for resistive random access memory retention reliability based on the Metropolis Monte Carlo algorithm and Gibbs free energy. The method, which does not rely on a time evolution, provides an extremely efficient way to compare the relative retention properties of metal-insulator-metal structures. It requires a small number of iterations and may be used for statistical analysis. The presented approach is used to compare the relative robustness of a single layer ZrO2 device with a double layer ZnO/ZrO2 one, and obtain results which are in good agreement with experimental data. (C) 2015 AIP Publishing LLC.
Phosphorous Diffuser Diverged Blue Laser Diode for Indoor Lighting and Communication
(2015-12-21)
Chi, Yu-Chieh
;
Hsieh, Dan-Hua
;
Lin, Chung-Yu
;
Chen, Hsiang-Yu
;
Huang, Chia-Yen
An advanced light-fidelity (Li-Fi) system based on the blue Gallium nitride (GaN) laser diode (LD) with a compact white-light phosphorous diffuser is demonstrated for fusing the indoor whitelighting and visible light communication (VLC). The phosphorous diffuser adhered blue GaN LD broadens luminescent spectrum and diverges beam spot to provide ample functionality including the completeness of Li-Fi feature and the quality of white-lighting. The phosphorous diffuser diverged white-light spot covers a radiant angle up to 120 degrees with CIE coordinates of (0.34, 0.37). On the other hand, the degradation on throughput frequency response of the blue LD is mainly attributed to the selffeedback caused by the reflection from the phosphor-air interface. It represents the current state-ofthe- art performance on carrying 5.2-Gbit/s orthogonal frequency-division multiplexed 16-quadratureamplitude modulation (16-QAM OFDM) data with a bit error rate (BER) of 3.1 x 10(-3) over a 60-cm freespace link. This work aims to explore the plausibility of the phosphorous diffuser diverged blue GaN LD for future hybrid white-lighting and VLC systems.
Experimental realization of ultrathin, double-sided metamaterial perfect absorber at terahertz gap through stochastic design process
(2015-12-22)
Huang, Tsung-Yu
;
Tseng, Ching-Wei
;
Yeh, Ting-Tso
;
Yeh, Tien-Tien
;
Luo, Chih-Wei
We design and demonstrate a flexible, ultrathin and double-sided metamaterial perfect absorber (MPA) at 2.39 terahertz (THz), which enables excellent light absorbance under incidences from two opposite sides. Herein, the MPA is fabricated on a lambda(0)/10.1-thick flexible polyethylene terephthalate substrate of epsilon(r) = 2.75 x (1 + 0.12i), sandwiched by two identical randomized metallic patterns by our stochastic design process. Such an MPA provides tailored permittivity and permeability to approach the impedance of free space for minimizing reflectance and a great imaginary part of the refractive index for reducing transmittance and finally results in high absorbance. Both experimental measurement and numerical simulation are in a good agreement. The flexible, ultrathin and double-sided MPA significantly differs from traditional quarter-wavelength absorbers and other single-sided perfect absorbers, paving a way toward practical THz applications in thermal emission, sensing and imaging, communications, stealth technique, and even energy harvesting.
Imaging magnetic and ferroelectric domains and interfacial spins in magnetoelectric La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3 heterostructures
(2015-12-23)
Huang, C-Y
;
Zhou, J.
;
Tra, V. T.
;
White, R.
;
Trappen, R.
Strong magnetoelectric coupling can occur at the interface between ferromagnetic and ferroelectric films. Similar to work on interfacial exchange bias, photoemission electron microscopy was utilized to image both magnetic and ferroelectric domains and the resulting interfacial Ti spin in the same locations of La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3 heterostructures. Multiple image analysis techniques, which could be applicable for a variety of fields needing quantitative data on image switching, confirm both improved magnetic switching and an increased population of interfacial spins with increased thickness of the ultrathin La0.7Sr0.3MnO3 layer. The perpendicular orientation of the interfacial spins is also discussed. This work suggests a magnetoelectric dead layer, with reduced interfacial magnetoelectricity when thin magnetic films are present.
Imaging magnetic and ferroelectric domains and interfacial spins in magnetoelectric La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3 heterostructures
(2015-12-23)
Huang, C-Y
;
Zhou, J.
;
Tra, V. T.
;
White, R.
;
Trappen, R.
Strong magnetoelectric coupling can occur at the interface between ferromagnetic and ferroelectric films. Similar to work on interfacial exchange bias, photoemission electron microscopy was utilized to image both magnetic and ferroelectric domains and the resulting interfacial Ti spin in the same locations of La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3 heterostructures. Multiple image analysis techniques, which could be applicable for a variety of fields needing quantitative data on image switching, confirm both improved magnetic switching and an increased population of interfacial spins with increased thickness of the ultrathin La0.7Sr0.3MnO3 layer. The perpendicular orientation of the interfacial spins is also discussed. This work suggests a magnetoelectric dead layer, with reduced interfacial magnetoelectricity when thin magnetic films are present.
原住民族自治　立法行不行
(2015-12-27)
王聖安
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Department of Communication and Technology
;
傳播與科技學系
《原住民族自治推動條例》充滿爭議，如何面對原住民族自治成為選舉要點。
研究生了沒？
(2015-12-27)
趙廣絜
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Department of Communication and Technology
;
傳播與科技學系
畢業後要不要念研究所是許多大學生心中的難題。
總編輯的話
(2015-12-27)
謝萱穎
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Department of Communication and Technology
;
傳播與科技學系
本期為喀報兩百三十二期，共有十二篇稿件。這期類目以人物為主，佐以社會議題、評論類、文化現象等，雖然篇目較少，但內容豐富多元。側欄廣告以二〇一六跨年活動為主題，和大家一同倒數新的一年。
圖畫記錄旅行　插畫家壘摳
(2015-12-27)
林謙耘
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Department of Communication and Technology
;
傳播與科技學系
插畫家壘摳，從插畫日記到個人接案，再到工作室共同創作，她堅信只要腳踏實地就會成功。
用漫畫說故事　正港奇片
(2015-12-27)
李宗諺
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Department of Communication and Technology
;
傳播與科技學系
漫畫家正港奇片，擁有豐富的靈感與想像力，讓讀者永遠猜不到漫畫的下一秒會發生什麼事。
孤獨　跨世紀的體悟
(2015-12-27)
麻愷晅
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Department of Communication and Technology
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傳播與科技學系
《孤獨的反義詞》與《十一種孤獨》兩書的創作雖橫跨半個世紀，傳達的思想卻相去不遠，皆點出孤獨的無可避免。
由愛出發　病人自主
(2015-12-27)
翁世樺
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Department of Communication and Technology
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傳播與科技學系
討論安寧療護在臺發展現況，以及病人自主權的宣導與爭取。
無敵破壞王　經典再創新
(2015-12-27)
黃吏玄
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Department of Communication and Technology
;
傳播與科技學系
無敵破壞王，做為一經典與創新的融合，帶來驚喜的呈現。
孫家隆　旅日的台灣原畫師
(2015-12-27)
吳昀蒨
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Department of Communication and Technology
;
傳播與科技學系
孫家隆之前是在日本工作的原畫師，現在回到台灣，希望能帶起台灣動畫業發展。
咖啡因　難以拒絕的誘惑
(2015-12-27)
許人文
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Department of Communication and Technology
;
傳播與科技學系
討論臺灣咖啡文化，及其背後隱藏的健康危機。
獻給台灣的情書　愛琳娜
(2015-12-27)
羅宛君
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Department of Communication and Technology
;
傳播與科技學系
電影【愛琳娜】以台語諧音「愛人哪」命名之，這部寫給台灣的情書。
堅持自我風格　梨寶
(2015-12-27)
蕭泳
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Department of Communication and Technology
;
傳播與科技學系
介紹女攝影師梨寶。