Browsing by Issue Date, starting with "2011-01-03"

Now showing 1 - 20 of 42382

Discharge and photo-luminance properties of a parallel plates electron emission lighting device
(2011-01-03)
Li, Chia-Hung
;
Liu, Ming-Chung
;
Chiang, Chang-Lin
;
Li, Jung-Yu
;
Chen, Shih-Pu
The gas discharge and photo-luminance properties of a planar lighting source featuring highly uniform light emission and mercury-free design were studied. The current density-voltage characteristics and the associated gas discharge of the devices operating with the values of the ratio of electric field to gas pressure (E/p) between 4.3 kV/Torr-cm and 35.7 kV/Torr-cm indicate that the width of the cathode fall extends over the entire gap between the two electrodes and the device is mostly in the obstructed discharge regime. The optical emission analysis confirmed the electron collision-induced gas emissions and strong effect of gas pressure on the phosphor emission when operated at constant current density, both are indicative of the primary roles played by the electron energy. (C)2011 Optical Society of America
Thermally stable green Ba(3)Y(PO(4))(3):Ce(3+),Tb(3+) and red Ca(3)Y(AlO)(3)(BO(3))(4):Eu(3+) phosphors for white-light fluorescent lamps
(2011-01-03)
Huang, Chien-Hao
;
Kuo, Te-Wen
;
Chen, Teng-Ming
;
應用化學系
;
Department of Applied Chemistry
A class of thermal stable of green-emitting phosphors Ba(3)Y(PO(4))(3):Ce(3+),Tb(3+) (BYP:Ce(3+),Tb(3+)) and red-emitting phosphors Ca(3)Y(AlO)(3)(BO(3))(4):Eu(3+) (CYAB:Eu(3+)) for white-light fluorescent lamps were synthesized by high temperature solid-state reaction. We observed a decay of only 3% at 150 degrees C for BYP:0.25Ce(3+),0.25Tb(3+) (3% for LaPO(4):Ce(3+),Tb(3+)), and a decay of 4% for CYAB:0.5Eu(3+) (7% for Y(2)O(3):Eu(3+), 24% for Y(2)O(2)S:Eu(3+)). The emission intensity of composition-optimized Ba(3)(Y(0.5)Ce(0.25)Tb(0.25))(PO(4))(3) is 70% of that of commercial LaPO(4):Ce(3+),Tb(3+) phosphors, and the CIE chromaticity coordinates are found to be (0.323, 0.534). The emission intensity of Ca(3)(Y(0.5)Eu(0.5))(AlO)(3)(BO(3))(4) is 70% and 83% of those of Y(2)O(3):Eu(3+) and Y(2)O(2)S:Eu(3+) phosphors, respectively, and the CIE chromaticity coordinates are redder (0.652, 0.342) than those of Y(2)O(3):Eu(3+) (0.645, 0.347) and Y(2)O(2)S:Eu(3+) (0.647, 0.343). A white-light fluorescent lamp is fabricated using composition-optimized Ba(3)(Y(0.5)Ce(0.25)Tb(0.25))(PO(4))(3) and Ca(3)(Y(0.5)Eu(0.5))(AlO)(3)(BO(3))(4) phosphors and matching blue-emitting phosphors. The results indicate that the quality of the brightness and color reproduction is suitable for application in shortwave UV fluorescent lamps. The white-light fluorescent lamp displays CIE chromaticity coordinates of x = 0.33, y = 0.35, a warm white light with a correlated color temperature of 5646 K, and a color-rendering index of Ra = 70. (C) 2010 Optical Society of America
Counting statistics in nanoscale junctions
(2011-01-03)
Liu, Yu-Shen
;
Chen, Yu-Chang
;
電子物理學系
;
Department of Electrophysics
We present first-principles calculations for moments of the current up to the third order in atomic-scale junctions. The quantum correlations of the current are calculated using the current operator in terms of the wave functions obtained self-consistently within the static density-functional theory. We investigate the relationships of the conductance, the second, and the third moment of the current for carbon atom chains of various lengths bridging two metal electrodes in the linear and nonlinear regimes. The conductance, the second-, and the third-order Fano factors exhibit odd-even oscillation with the number of carbon atoms due to the full and half filled pi* orbital near the Fermi levels. The third-order Fano factor and the conductance are positively correlated.
Thermally stable green Ba3Y(PO4)(3):Ce3+,Tb3+ and red Ca3Y(AlO)(3)(BO3)(4):Eu3+ phosphors for white-light fluorescent lamps
(2011-01-03)
Huang, Chien-Hao
;
Kuo, Te-Wen
;
Chen, Teng-Ming
;
應用化學系
;
Department of Applied Chemistry
A class of thermal stable of green-emitting phosphors Ba3Y(PO4)(3):Ce3+,Tb3+ (BYP:Ce3+,Tb3+) and red-emitting phosphors Ca3Y(AlO)(3)(BO3)(4):Eu3+ (CYAB:Eu3+) for white-light fluorescent lamps were synthesized by high temperature solid-state reaction. We observed a decay of only 3% at 150 degrees C for BYP:0.25Ce(3+),0.25Tb(3+) (3% for LaPO4:Ce3+,Tb3+), and a decay of 4% for CYAB:0.5Eu(3+) (7% for Y2O3:Eu3+, 24% for Y2O2S:Eu3+). The emission intensity of composition-optimized Ba-3(Y0.5Ce0.25Tb0.25)(PO4)(3) is 70% of that of commercial LaPO4:Ce3+,Tb3+ phosphors, and the CIE chromaticity coordinates are found to be (0.323, 0.534). The emission intensity of Ca-3(Y0.5Eu0.5)(AlO)(3)(BO3)(4) is 70% and 83% of those of Y2O3:Eu3+ and Y2O2S:Eu3+ phosphors, respectively, and the CIE chromaticity coordinates are redder (0.652, 0.342) than those of Y2O3:Eu3+ (0.645, 0.347) and Y2O2S:Eu3+ (0.647, 0.343). A white-light fluorescent lamp is fabricated using composition-optimized Ba-3(Y0.5Ce0.25Tb0.25)(PO4)(3) and Ca-3(Y0.5Eu0.5)(AlO)(3)(BO3)(4) phosphors and matching blue-emitting phosphors. The results indicate that the quality of the brightness and color reproduction is suitable for application in shortwave UV fluorescent lamps. The white-light fluorescent lamp displays CIE chromaticity coordinates of x = 0.33, y = 0.35, a warm white light with a correlated color temperature of 5646 K, and a color-rendering index of Ra = 70. (C) 2010 Optical Society of America
Enhanced conversion efficiency of a crystalline silicon solar cell with frustum nanorod arrays
(2011-01-03)
Tsai, Min-An
;
Tseng, Ping-Chen
;
Chen, Hsin-Chu
;
Kuo, Hao-Chung
;
Yu, Peichen
Enhanced photoelectric conversion is demonstrated in a crystalline silicon (c-Si) solar cell with frustum nanorod arrays (FNAs), fabricated using colloidal lithography and reactive-ion etching techniques. Under a simulated one-sun condition, the cell with FNAs improves the power conversion efficiency by nearly 30%, compared to a conventional wet-chemical-textured reference. The enhancement mostly arises from the superior antireflective properties for wavelengths between 400 nm and 1000 nm. In that spectral range, we show that photons gained by reflection reduction directly contribute to collected carriers without auxiliary losses due to nano-fabrication. Moreover, the omnidirectional antireflection of FNAs is also investigated using an angle-resolved reflectance spectroscopy. The dimensions of FNAs are further analyzed with numerical calculations based on Maxwell's equations. The optimized short-circuit current density achieves nearly 40 mA/cm(2), corresponding to a 16% enhancement compared to the conventional device. (C)2010 Optical Society of America
交大e-News第086期
(2011-01-05)
Secretariat
;
國立交通大學秘書室
METHOD FOR MANUFACTURING SELF-ALIGNED THIN-FILM TRANSISTOR AND STRUCTURE THEREOF
(2011-01-06)
Chou, Cheng Wei
;
Zan, Hsiao Wen
;
Tsai, Chuang Chuang
A method for manufacturing a self-aligned thin-film transistor (TFT) is described. Firstly, an oxide gate, a dielectric layer, and a photoresist layer are deposited on a first surface of a transparent substrate in sequence. Then, an ultraviolet light is irradiated on a second surface of the substrate opposite to the first surface to expose the photoresist layer, in which a gate manufactured by the oxide gate serves as a mask, and absorbs the ultraviolet light irradiated on the photoresist layer corresponding to the oxide gate. Then, the exposed photoresist layer is removed, and a transparent conductive layer is deposited on the unexposed photoresist layer and the dielectric layer. Then, a patterning process is executed on the transparent conductive layer to form a source and a drain, and an active layer is formed to cover the source, the drain, and the dielectric layer, so as to finish a self-aligned TFT structure.
Overexpression of urokinase-type plasminogen activator in pterygia and pterygium fibroblasts
(2011-01-06)
Chao, Shih-Chun
;
Hu, Dan-Ning
;
Yang, Pei-Yu
;
Lin, Ching-Yang
;
Yang, Shun-Fa
Purpose: Urokinase-type plasminogen activator (uPA) is a protease involved in tissue remodeling and cell migration. Little is known about the expression of uPA in pterygium. The purpose of this study was to investigate the expression of uPA mRNA and activities in various stages of surgically excised pterygia specimens and cultured pterygium fibroblasts and to compare them with normal conjunctival tissues and fibroblasts. Methods: The expression of uPA mRNA and activity in 15 pterygium tissues and cultured fibroblasts from pterygium were measured using quantitative RT-PCR and zymography. Five normal conjunctiva specimens and cultured conjunctival fibroblasts were tested as the controls. Results: The expression of uPA mRNA and activities in pterygia and pterygium fibroblasts were significantly greater than those of the normal samples (p<0.05) and were closely related to the progression of pterygium. The amounts of uPA mRNA and activities in early, moderate, and advanced pterygia were 100%, 208%, and 311% and 100%, 157%, and 280% of the early stage specimens, respectively. The amounts of uPA mRNA and the activities in cultured pterygium fibroblasts isolated from early, moderate, and advanced pterygium specimens were 100%, 219%, and 457% and 100%, 198% and 355% of early stage fibroblasts, respectively. Conclusions: Overexpression of uPA was present in pterygium and their fibroblasts. The expression of uPA by pterygium increased significantly following the progression of the pterygium. The increased expression of uPA may covert plasminogen to plasmin, degrade extracellular matrixes, stimulate cell migration, induce angiogenesis, and plays an important role in the development and progression of pterygium.
Non-thermal reaction triggered by a stimulated Raman process using 5-fs laser pulses in the electronic ground state: Claisen rearrangement of allyl phenyl ether
(2011-01-07)
Iwakura, Izumi
;
Yabushita, Atsushi
;
Kobayashi, Takayoshi
;
電子物理學系
;
Department of Electrophysics
The vibrational populations of allyl phenyl ether were excited by a broadband visible 5-fs laser pulse by the stimulated Raman process to promote a 'non-thermal' Claisen rearrangement reaction in the electronic ground state. Analyses of the time-resolved vibrational spectra observed in the subpicosecond region has shown that the Claisen rearrangement proceeds in the following three-step pathway: (1) weakening of the C(3)O bond to generate a bis-allyl intermediate, (2) formation of the weak C(1)C(5) bond results in the generation of a six-membered structure, and (3) simultaneous processes of C(3)O breaking and C(1)C(5) formation leading to the generation of a keto-intermediate. (C) 2010 Elsevier B.V. All rights reserved.
Meta-analysis of Dense Genecentric Association Studies Reveals Common and Uncommon Variants Associated with Height
(2011-01-07)
Lanktree, Matthew B.
;
Guo, Yiran
;
Murtaza, Muhammed
;
Glessner, Joseph T.
;
Bailey, Swneke D.
Height is a classic complex trait with common variants in a growing list of genes known to contribute to the phenotype. Using a genecentric genotyping array targeted toward cardiovascular-related loci, comprising 49,320 SNPs across approximately 2000 loci, we evaluated the association of common and uncommon SNPs with adult height in 114,223 individuals from 47 studies and six ethnicities. A total of 64 loci contained a SNP associated with height at array-wide significance (p < 2.4 x 10(-6)), with 42 loci surpassing the conventional genome-wide significance threshold (p < 5 x 10(-8)). Common variants with minor allele frequencies greater than 5% were observed to be associated with height in 37 previously reported loci. In individuals of European ancestry, uncommon SNPs in IL11 and SMAD3, which would not be genotyped with the use of standard genome-wide genotyping arrays, were strongly associated with height (p < 3 x 10(-11)). Conditional analysis within associated regions revealed five additional variants associated with height independent of lead SNPs within the locus, suggesting allelic heterogeneity. Although underpowered to replicate findings from individuals of European ancestry, the direction of effect of associated variants was largely consistent in African American, South Asian, and Hispanic populations. Overall, we show that dense coverage of genes for uncommon SNPs, coupled with large-scale meta-analysis, can successfully identify additional variants associated with a common complex trait.
老人安養　心理照顧更重要
(2011-01-09)
林映綺
;
Department of Communication and Technology
;
傳播與科技學系
隨著醫療資源的進步，高齡化社會已成為全球的趨勢，針對老人福利的政策也因應而生。根據內政部統計處資料顯示，九十九年六月底止，臺灣戶籍登記人口之六十五歲以上老人占總人口比例10.69％，隨著越來越高齡的社會型態，政府除了提供老人福利外，針對老人安養也有機構式之照顧。
PTT挨批　網路纏風波
(2011-01-09)
張宇翔
;
Department of Communication and Technology
;
傳播與科技學系
前暨南大學校長李家同近來連日針對大學生使用網路的習慣提出質疑，以「笨蛋才上PPT〈應為PTT，此為李家同之誤用〉」、「為什麼要重視網友的看法？網路評論絲毫不能代表民意，硬要去管這種事情的話不勝其煩。」這類犀利的言詞，對網路上所呈現的資訊與評論做出價值判斷，引發網友的熱烈討論。對網路媒體使用上的認知落差，也因李家同與網民之間的互動而重新被喚起。
消費性聖誕節
(2011-01-09)
鄭家宜
;
Department of Communication and Technology
;
傳播與科技學系
現今的聖誕節已經不是原本的那個「聖誕」了，除了商家為促進消費者購物所做的炒作，還有許多企業利用人人都喜歡的聖誕節趁機包裝了自己的形象，在民眾的照片中更留下了「最深刻」的印象。也或許是歡樂溫馨聖誕節產生的愉悅心情起了作用，民眾對平常不甚喜愛看到的廣告和Logo也都不排斥，反而產生了好感。聖誕節能刺激消費，但是「聖誕節」竟然也被消費了。
環島公路的缺口　台26線
(2011-01-09)
蔡少安
;
Department of Communication and Technology
;
傳播與科技學系
抱持著對生態環境的憂慮的反對者，滿心期待的台東住民，台26線，台灣最後的海岸線會如何發展？歹戲拖棚，萬眾拭目以待的環道公路最終幕！
奢侈稅上路　中產階級苦
(2011-01-09)
潘珮瑄
;
Department of Communication and Technology
;
傳播與科技學系
隨著景氣慢慢回升，政府也開始擬定新政策，除了二代健保之外，商議八年之久的奢侈稅，財政部也在12月中發佈預計開徵的消息，這個全新的稅制究竟該如何執行，有多少實質效益呢？
譚經緯　大談經濟學人生
(2011-01-09)
張芳瑜
;
Department of Communication and Technology
;
傳播與科技學系
「現在還想加簽的有幾個人？」交通大學的通識課程中，有一門十分搶手的科目〈經濟學概論〉，每到學期初選課之際，交大選課版上都會出現許多詢問的聲浪，課堂上想要加選的學生也多達十幾、二十位。這堂熱門通識課的任課老師，正是受到許多交大學生喜愛的譚經緯。多數修過譚經緯〈經濟學〉的學生，都會極力推薦這門課，「老師的課超優，想要翹課的最好別來！」
喀報放寒假　梅竹賽再見面
(2011-01-09)
《喀報》
;
Department of Communication and Technology
;
傳播與科技學系
民國一百年來到時，《喀報》也來到第九十八期、即將邁進一百期了。三年半來，《喀報》完全是由交通大學「傳播與科技系」的同學自由找主題、自行創作，並在彼此檢討切磋中求進步。
學生是我的老師　曾華璧
(2011-01-09)
蔡妙鈴
;
Department of Communication and Technology
;
傳播與科技學系
「學生是我生命中的老師。」曾華璧經常感性地分享她的處世經驗。目前是交通大學通識教育中心的教授，授課時講到有趣的題材總是不避諱地哈哈大笑，爽朗的笑聲經常感染在場學生一起同樂。
童難抵速食　禁送玩具惹議
(2011-01-09)
林書羽
;
Department of Communication and Technology
;
傳播與科技學系
去年底美國加州有一名擁有兩個小孩的母親帶頭發起集體訴訟，控告麥當勞的快樂兒童餐玩具引誘兒童吃不健康的食物。話題延燒至台灣，日前立法委員提案行政院，希望盡快修法限制速食業者兒童餐附送玩具，以保障台灣兒童的身體健康。
老少咸宜的熱帶荒島求生術
(2011-01-09)
沈祐平
;
Department of Communication and Technology
;
傳播與科技學系
有鑑於現代人與自然環境脫節，特此提供幾種面對自然環境時的應對方法，雖然大家應當不至於流落荒島，不過多一點自然常識，去郊遊的時候也更安全唷。