Browsing by Issue Date, starting with "2010-05-15"

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Strong orbital polarization in orthorhombic DyMnO3: A combined x-ray linear dichroism and ab initio electronic structure study
(2010-05-15)
Chen, J. M.
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Hu, Z.
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Jeng, H. T.
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Chin, Y. Y.
;
Lee, J. M.
We present a combined experimental and theoretical study on the Mn 3d orbital occupation in orthorhombic DyMnO3 single crystals. We have observed a very strong polarization dependence in the Mn L-2,L-3 x-ray absorption spectra, indicative for a distinct anisotropic orbital occupation. Ab initio electronic-structure calculations clearly infer the existence of a strong orbital polarization in the e(g) band with a staggered d(3x2-r2)/d(3y2-r2)-type ordering pattern in the ab plane. This finding is in excellent agreement with a quantitative analyis of the spectra using the atomic multiplet cluster approach.
Optimization and sensitivity analysis of controlling arrivals in the queueing system with single working vacation
(2010-05-15)
Yang, Dong-Yuh
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Wang, Kuo-Hsiung
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Wu, Chia-Huang
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工業工程與管理學系
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Department of Industrial Engineering and Management
This paper analyzes the F-policy M/M/1/K queueing system with working vacation and an exponential startup time. The F-policy deals with the issue of controlling arrivals to a queueing system, and the server requires a startup time before allowing customers to enter the system. For the queueing systems with working vacation, the server can still provide service to customers rather than completely stop the service during a vacation period. The matrix-analytic method is applied to develop the steady-state probabilities, and then obtain several system characteristics. We construct the expected cost function and formulate an optimization problem to find the minimum cost. The direct search method and Quasi-Newton method are implemented to determine the optimal system capacity K, the optimal threshold F and the optimal service rates (mu(B), mu(V)) at the minimum cost. A sensitivity analysis is conducted to investigate the effect of changes in the system parameters on the expected cost function. Finally, numerical examples are provided for illustration purpose. (C) 2010 Elsevier B.V. All rights reserved.
Strong orbital polarization in orthorhombic DyMnO(3): A combined x-ray linear dichroism and ab initio electronic structure study
(2010-05-15)
Chen, J. M.
;
Hu, Z.
;
Jeng, H. T.
;
Chin, Y. Y.
;
Lee, J. M.
We present a combined experimental and theoretical study on the Mn 3d orbital occupation in orthorhombic DyMnO(3) single crystals. We have observed a very strong polarization dependence in the Mn L(2,3) x-ray absorption spectra, indicative for a distinct anisotropic orbital occupation. Ab initio electronic-structure calculations clearly infer the existence of a strong orbital polarization in the e(g) band with a staggered d(3x2-r2)/d(3y2-r2)-type ordering pattern in the ab plane. This finding is in excellent agreement with a quantitative analyis of the spectra using the atomic multiplet cluster approach.
Cellular automaton simulations for mixed traffic with erratic motorcycles' behaviours
(2010-05-15)
Lan, Lawrence W.
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Chiou, Yu-Chiun
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Lin, Zih-Shin
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Hsu, Chih-Cheng
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運輸與物流管理系註：原交通所+運管所
Modeling mixed traffic composed of motorcycles can be a challenging issue because many erratic motorcyclists may not follow the lane disciplines, particularly when traffic is congested. Based upon the refined cellular automaton (CA) model recently developed by the authors [LW. Lan, Y C Chiou. Z.S. Lin, C.C. Hsu, Physica A 388 (2009) 3917-3930], this paper further proposed a sophisticated CA model to elucidate the erratic motorcycle behaviours in mixed traffic contexts. In addition to the conventional moving forward and lane-change rules, the sophisticated CA model also explicated the lateral drift behaviour for cars moving in the same lane, the lateral drift behaviour for motorcycles breaking into two moving cars. and the transverse crossing behaviour for motorcycles through the gap between two stationary cars in the same lane. Fundamental diagrams and space-time trajectories for vehicles with various car-motorcycle mixed ratios are demonstrated (C) 2010 Elsevier B.V. All rights reserved
Growth, microstructure, and field-emission properties of synthesized diamond film on adamantane-coated silicon substrate by microwave plasma chemical vapor deposition
(2010-05-15)
Tiwari, Rajanish N.
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Chang, Li
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材料科學與工程學系
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Department of Materials Science and Engineering
Diamond nucleation on unscratched Si surface is great importance for its growth, and detailed understanding of this process is therefore desired for many applications. The pretreatment of the substrate surface may influence the initial growth period. In this study, diamond films have been synthesized on adamantane-coated crystalline silicon {100} substrate by microwave plasma chemical vapor deposition from a gaseous mixture of methane and hydrogen gases without the application of a bias voltage to the substrates. Prior to adamantane coating, the Si substrates were not pretreated such as abraded/scratched. The substrate temperature was similar to 530 degrees C during diamond deposition. The deposited films are characterized by scanning electron microscopy, Raman spectrometry, x-ray diffraction, and x-ray photoelectron spectroscopy. These measurements provide definitive evidence for high-crystalline quality diamond film, which is synthesized on a SiC rather than clean Si substrate. Characterization through atomic force microscope allows establishing fine quality criteria of the film according to the grain size of nanodiamond along with SiC. The diamond films exhibit a low-threshold (55 V/mu m) and high current-density (1.6 mA/cm(2)) field-emission (FE) display. The possible mechanism of formation of diamond films and their FE properties have been demonstrated. (C) 2010 American Institute of Physics. [doi:10.1063/1.3427436]
Kondo effect in a side-coupled double quantum dot system embedded in a mesoscopic ring
(2010-05-15)
Tsai, I-Ling
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Chung, Chung-Hou
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電子物理學系
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Department of Electrophysics
We study finite-size effect of the Kondo screening cloud in a double quantum dot setup via a large-N slave-boson mean-field theory. In this setup, one of the dots is embedded in a close metallic ring with a finite size L and the other dot is side coupled to the embedded dot via an antiferromagnetic spin-spin-exchange coupling with a strength K. The antiferromagnetic coupling favors local spin-singlet state and suppresses the Kondo screening. The mean-field phase diagram as a function of 1/L and K shows a crossover to the local spin-singlet ground state from the Kondo phase to occur at K < K(c) (L = 4n, 4n + 1, 4n + 3) and at K > K(c) (L = 4n + 2). The effective Kondo temperature T(k) (proptotional to inverse of the Kondo screening cloud size) shows the Kosterlitz-Thouless (KT) scaling at finite sizes for L = 4n, 4n + 2, indicating quantum transition of the KT type between the Kondo screened phase for K <= K(c) and a local spin-singlet phase for K >= K(c) in the thermodynamic limit with Kc being the critical value. The local density of states on the embedded quantum dot and the persistent current at finite sizes with different values of K are calculated in the crossover region.
陳樂融創作自己的文化人
(2010-05-16)
林穎瑄
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Department of Communication and Technology
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傳播與科技學系
他，身兼作詞家、作家、編劇、主持人、策劃以及各類獎項評審。知名趨勢專家詹宏志說他是「一位知識分子在大眾文化裡的臥底者」。而陳樂融自己也提到，他是一位創意人，是屬於整個音樂工業的幕後者，暢銷名曲或藝人背後的魔術師。
蔡政志超尺度藝術精神
(2010-05-16)
陳維平
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Department of Communication and Technology
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傳播與科技學系
是對什麼事的執著，讓今年四十三歲的蔡政志成為別人口中的瘋子？座落於高雄市後昌路，蔡政志美術館的故事要從1996年說起。隱身在一排平凡的透天厝當中，從鐵捲們上的塗鴉、入口的雕塑擺設、到原本貼灰色的電表，這棟建築裡裡外外都可以看見蔡政志精緻裝點過後的鮮艷色彩。他甚至表示「作品把我從家裡頭趕出來了」，因為作品日漸增加，蔡政志必須把空間讓位給他的藝術、另尋住所。
在哪　有想要的幸福
(2010-05-16)
林雨萱
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Department of Communication and Technology
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傳播與科技學系
這世界上，在哪些國家同性婚姻是合法的呢？
微脂體及其製造方法
(2010-05-16)
廖光文
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劉彥谷
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林于鈴
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林靜宜
一種微脂體，其包括中性脂質膜、帶正電聚合物以及界面活性聚合物。中性脂質膜形成中空球體結構，帶正電聚合物以非共價鍵結合的方式分佈於中性脂質膜上，界面活性聚合物以非共價鍵結合的方式分佈於中性脂質膜上。此微脂體可以非共價鍵結合的方式穩定地吸附大量生物物質。
你在看我的部落格！
(2010-05-16)
徐鈺婷
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Department of Communication and Technology
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傳播與科技學系
部落就像是兩面刃一樣無時無刻改變部落格經營者、閱聽人和媒體間的關係。
馬克斯　追尋自我的設計夢
(2010-05-16)
林忻
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Department of Communication and Technology
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傳播與科技學系
翻開《極地之光：瑞典.設計經濟學》，不同於許多以圖片為噱頭、彷如旅遊書一般的異國設計書，作者以俐落的文筆，完整而精闢地剖析瑞典設計產業。然而透過這些文字，很難想像這位對設計產業具有深刻觀點的作者－馬克斯，竟然不曾接受過設計相關的學術訓練，甚至是出身自強調理性思維的法律系。
微型揚聲器性能評估方法及系統
(2010-05-16)
白明憲
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陳榮亮
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劉青育
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徐偉智
一種微型揚聲器性能評估方法及系統，主要是藉由一收音器對一微型揚聲器量測，再透過一訊號分析儀之訊息擷取及分析，然後利用一具有各式量測運算函式執行功能的運算處理模組，對由該訊號分析儀所傳送之量測及分析值進行運算，而產生一阻抗評估數據、一振膜速度評估數據、一振型性能評估數據、一聲壓性能評估數據、一感度性能評估數據、一總諧波失真性能評估數據、一效率性能評估數據、一指向性性能評估數據及一互調波失真性能評估數據。最後，藉由一顯示裝置及一組顯示介面將前述數據呈現出，以達完整呈現該微型揚聲器主要性能評估的目的。
面對災難我們一起攜手(錯交稿，請勿編輯)
(2010-05-16)
樓楚楚
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Department of Communication and Technology
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傳播與科技學系
兩岸共同抗擊災害迎接挑戰
小小的禮物
(2010-05-16)
童于蕙
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Department of Communication and Technology
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傳播與科技學系
來不及說的話、來不及實現的願望、來不及送的禮物，只能說對不起。「對不起，對不起，對不起。」還能做些什麼嗎？她發現一個把禮物送出去的辦法......
在《魔繭》中做永生的夢
(2010-05-16)
陳宣聿
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Department of Communication and Technology
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傳播與科技學系
走到了八○年代，科幻電影的內容不再只有恐怖或特效訴求。一九八五年上映的《魔繭》，是以溫馨為訴求的科幻電影，內容描述一群養老院中的長者和外星人相遇的故事，劇情簡單而深刻。
《刀裡藏笑》漫談整形書誌
(2010-05-16)
黃艾如
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Department of Communication and Technology
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傳播與科技學系
現在是全民瘋美容的時代，對於整型的觀念也不如以往的保守。打開電視與報章雜誌，甚至可以看到女藝人不諱言自身的整容經驗，更有名人以此作為賣點，搖身一變成為醫學美容專家，出版著作大談整形手術及成效。
經綸滿腹培養兒童五德
(2010-05-16)
賴合新
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Department of Communication and Technology
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傳播與科技學系
兒童讀經教育，顧名思義就是「教導兒童讀誦經典」，是一種回歸於古人讀書、吸收知識的學習方式。本理念是藉由反覆背誦古代經典著作，把握兒童學齡前最優異的大腦記憶能力，達到涵養氣質、培養內外五德、增進語文能力、理解力開發等長遠效果。
城市縮影　牯嶺街的興衰
(2010-05-16)
徐瑩峰
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Department of Communication and Technology
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傳播與科技學系
歷經清朝、日本與國民政府的統治，位在政治經濟中心的台北，仍然留有許多城市發展的軌跡。追尋城市發展的過程，除了替城市寫歷史，也為現代化城市注入傳統元素，增加城市的深度與活力。近年來小有名氣的牯嶺街，從清朝初步開發以來，經過日治時期與戰後的發展，歷經興盛的黃金時期又逐漸沒落，或許可以成為一個觀察城市發展的縮影。
高等教育向國際化跨步
(2010-05-16)
楊茹閔
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Department of Communication and Technology
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傳播與科技學系
高等教育向國際化跨步