Browsing by Issue Date, starting with "2008-10-08"

Now showing 1 - 20 of 54423

Dissociation dynamics of anionic and excited neutral fragments of gaseous SiCl4 following Cl 2p and Si 2p core-level excitations
(2008-10-08)
Chen, J. M.
;
Lu, K. T.
;
Lee, J. M.
;
Chou, T. L.
;
Chen, H. C.
The state-selective dissociation dynamics for anionic and excited neutral fragments of gaseous SiCl4 following Cl 2p and Si 2p core-level excitations were characterized by combining measurements of the photon-induced anionic dissociation, x-ray absorption and UV/visible dispersed fluorescence. The transitions of core electrons to high Rydberg states) doubly excited states in the vicinity of both Si 2p and Cl 2p ionization thresholds of gaseous SiCl4 lead to a remarkably enhanced production of anionic, Si-and Cl-, fragments and excited neutral atomic, Si*, fragments. This enhancement via core-level excitation near the ionization threshold of gaseous SiCl4 is explained in terms of the contributions from the Auger decay of doubly excited states, shake-modified resonant Auger decay, or/and post-collision interaction. These complementary results provide insight into the state-selective anionic and excited neutral fragmentation of gaseous molecules via core-level excitation.
Dissociation dynamics of anionic and excited neutral fragments of gaseous SiCl(4) following Cl 2p and Si 2p core-level excitations
(2008-10-08)
Chen, J. M.
;
Lu, K. T.
;
Lee, J. M.
;
Chou, T. L.
;
Chen, H. C.
The state-selective dissociation dynamics for anionic and excited neutral fragments of gaseous SiCl(4) following Cl 2p and Si 2p core-level excitations were characterized by combining measurements of the photon-induced anionic dissociation, x-ray absorption and UV/visible dispersed fluorescence. The transitions of core electrons to high Rydberg states) doubly excited states in the vicinity of both Si 2p and Cl 2p ionization thresholds of gaseous SiCl4 lead to a remarkably enhanced production of anionic, Si-and Cl(-), fragments and excited neutral atomic, Si*, fragments. This enhancement via core-level excitation near the ionization threshold of gaseous SiCl4 is explained in terms of the contributions from the Auger decay of doubly excited states, shake-modified resonant Auger decay, or/and post-collision interaction. These complementary results provide insight into the state-selective anionic and excited neutral fragmentation of gaseous molecules via core-level excitation.
Synthesis and optical properties of white-light-emitting alumina/ZnO nanotubes
(2008-10-08)
Hsiao, Chi-Sheng
;
Chen, San-Yuan
;
Kuo, Wan-Lin
;
Lin, Chin-Ching
;
Cheng, Syh-Yuh
A simple chemical solution process was used to prepare alumina nanoparticle-coated ZnO nanotubes (ANZTs). Transmission electron microscope (TEM) images proved that the alumina nanoparticles were uniformly dispersed on the ZnO nanotubes. After thermal treatment at different temperatures under various atmospheres, photoluminescence (PL) measurements showed that the ANZTs emitted a variety of colors, including blue, green and white light. Gaussian curve fitting of the PL spectra revealed that the competition between the blue, blue-green, green and yellow band emissions and their relative emission intensities were strongly associated with various defects. Blue emission was attributed to large numbers of oxygen defects in alumina, while green and yellow emissions were related to oxygen and zinc defects in ZnO, respectively. Under specific conditions, white light, consisting of blue, blue-green, green and yellow band emissions, was obtained. Further TEM analysis indicated that the defect structure of ANZTs could be manipulated by the interface interaction between alumina and the ZnO nanotubes.
Surfactant-Free, Self-Assembled PVA-Iron Oxide/Silica Core-Shell Nanocarriers for Highly Sensitive, Magnetically Controlled Drug Release and Ultrahigh Cancer Cell Uptake Efficiency
(2008-10-09)
Hu, Shang-Hsiu
;
Liu, Dean-Mo
;
Tung, Wei-Lin
;
Liao, Chen-Fu
;
Chen, San-Yuan
Surfactant-free, self-assembled iron oxide/silica core-shell (SAIO@SiO2) nanocarriers were synthesized as bifunctional magnetic vectors that can be triggered for the controlled release of therapeutic agents by an external magnetic field. In addition, drug release profiles can be well-regulated through an ultrathin layer of silica shell. The hydrophobic drug molecules were encapsulated within the iron oxide-PVA core and then further covered with a thin-layer silica shell to regulate the release pattern. Remote control of drug release from the SAIO@SiO2 nanocarriers was achieved successfully using an external magnetic field where the core phase being structurally disintegrated to a certain extent while subjected to magnetic stimulus, resulting in a burst release of the encapsulated drug. However, a relatively slow and linear release restored immediately, directly after removal of the stimulus. The nanostructural evolution of the nanocarriers upon the stimulus was examined and the mechanism for controlled drug release is proposed for such a core-shell nanocarrier. Surprisingly, the surfactant-free SAIO@SiO2 nanocarriers demonstrated a relatively high uptake efficiency from the HeLa cell line. Together with a well-regulated controlled release design, the nanocarriers may provide great advantages as an effective cell-based drug delivery nanosystem for biomedical applications.
Unusually large exponent for the inverse power-law blinking of single chromophores
(2008-10-09)
Lee, Der-Hau
;
Tang, Jau
;
光電工程學系
;
Department of Photonics
In this study of single-particle fluorescence intermittency, we investigate some Interesting blinking phenomena of chromophores by Yeow et al. (J. Phys. Chem. A 2006, 110, 1726), showing behavior very different from the usual quantum dots. Using Monte Carlo simulations we demonstrate that the short-time blinking statistics are generally nonexponential but could be characterized by an inverse power law with an effective exponent m far exceeding 2, as observed in some single-chromophores experiments. We show that in. for the on-events decreases with the effective diffusion correlation time which increases with light intensity. This work offers an explanation to why m could change from 2.8 to 2.0 in their experiments as the light intensity is quadrupled.
Discovery of dominant and dormant genes from expression data using a novel generalization of SNR for multi-class problems
(2008-10-09)
Tsai, Yu-Shuen
;
Lin, Chin-Teng
;
Tseng, George C.
;
Chung, I-Fang
;
Pal, Nikhil Ranjan
Background: The Signal-to-Noise-Ratio (SNR) is often used for identification of biomarkers for two-class problems and no formal and useful generalization of SNR is available for multiclass problems. We propose innovative generalizations of SNR for multiclass cancer discrimination through introduction of two indices, Gene Dominant Index and Gene Dormant Index ( GDIs). These two indices lead to the concepts of dominant and dormant genes with biological significance. We use these indices to develop methodologies for discovery of dominant and dormant biomarkers with interesting biological significance. The dominancy and dormancy of the identified biomarkers and their excellent discriminating power are also demonstrated pictorially using the scatterplot of individual gene and 2-D Sammon's projection of the selected set of genes. Using information from the literature we have shown that the GDI based method can identify dominant and dormant genes that play significant roles in cancer biology. These biomarkers are also used to design diagnostic prediction systems. Results and discussion: To evaluate the effectiveness of the GDIs, we have used four multiclass cancer data sets (Small Round Blue Cell Tumors, Leukemia, Central Nervous System Tumors, and Lung Cancer). For each data set we demonstrate that the new indices can find biologically meaningful genes that can act as biomarkers. We then use six machine learning tools, Nearest Neighbor Classifier (NNC), Nearest Mean Classifier (NMC), Support Vector Machine (SVM) classifier with linear kernel, and SVM classifier with Gaussian kernel, where both SVMs are used in conjunction with one-vs-all (OVA) and one-vs-one (OVO) strategies. We found GDIs to be very effective in identifying biomarkers with strong class specific signatures. With all six tools and for all data sets we could achieve better or comparable prediction accuracies usually with fewer marker genes than results reported in the literature using the same computational protocols. The dominant genes are usually easy to find while good dormant genes may not always be available as dormant genes require stronger constraints to be satisfied; but when they are available, they can be used for authentication of diagnosis. Conclusion: Since GDI based schemes can find a small set of dominant/dormant biomarkers that is adequate to design diagnostic prediction systems, it opens up the possibility of using real-time qPCR assays or antibody based methods such as ELISA for an easy and low cost diagnosis of diseases. The dominant and dormant genes found by GDIs can be used in different ways to design more reliable diagnostic prediction systems.
自我注入式雷射二極體之全光2R再生器
(2008-10-11)
祁甡
;
李健仲
;
錢鴻章
本發明為自我注入式雷射二極體之全光2R再生器,由自我注入式雷射二極體、透鏡、反射元件及光纖尾纖構成,其中,反射元件直接封裝於全光2R再生器,取代傳統架構之外部雷射,並且本發明之全光2R再生器可自行產生增益,因此不須大量使用昂貴的摻鉺光纖放大器,進而使成本降低,並降低系統複雜性。
具有低電壓元件設計之混合電壓輸入／輸出緩衝器
(2008-10-11)
柯明道
;
陳世倫
一種具有低電壓元件設計之混合電壓輸入/輸出緩衝器,包含預驅動器、循軌單元、驅動單元、輸入/輸出接墊、浮接阱單元及輸送單元;預驅動器,用以接收第一資料信號及致能信號,及輸出第一及第二資料電壓;循軌單元,用以提供閘極循軌功能;驅動單元,耦接預驅動器及循軌單元,用以產生對應於第一資料電壓之第一緩衝電壓;輸入/輸出接墊,耦接至驅動單元,用以輸出第一緩衝電壓及接收第二資料信號;輸送單元,用以輸出對應於第二資料信號之第二緩衝電壓;以及浮接阱單元,耦接至驅動單元及輸入/輸出接墊,用以防止漏電流發生。
當紅炸子「雞」：你今天「慘叫」了嗎？　
(2008-10-12)
徐苾芬
;
Department of Communication and Technology
;
傳播與科技學系
一直以來，玩具這個東西都是賣給小孩子，讓他們可以動動腦筋獲得娛樂。但是現在成年了，雖然說不再是玩玩具的年紀，但是卻有不少專門為了成年人所製作的玩具。當然最主要的原因，在於現在人壓力大，偶爾願意花錢去買一些可以發洩的玩具來把玩，帶給自己一點樂子，以排解心中的不滿..........
天籟之音－－首席紅伶Sarah Brightman
(2008-10-12)
吳佳玲
;
Department of Communication and Technology
;
傳播與科技學系
藉由今年奧運莎拉布萊曼演唱開幕曲做為導言，接著主要介紹莎拉的特色以及特殊所在，最後再介紹莎拉於今年年初推出的新專輯。
《大哥大》九把刀的黃金梅利號
(2008-10-12)
林潔
;
Department of Communication and Technology
;
傳播與科技學系
宗教狂熱的舍監，妙齡女子手機依存症，兩篇故事，不一樣的都市恐怖病
「奇蹟的夏天」一股讓人重拾夢想的力量!
(2008-10-12)
羅佩雯
;
Department of Communication and Technology
;
傳播與科技學系
一群愛踢球的孩子，只是想完成屬於他們的夢想。在花蓮美崙國中足球隊的生活裡，這群很會踢球、很愛踢球的孩子們，在短短三年的歲月裡，是他們這輩子流下最多汗水和淚水的日子。他們有個永遠支持他們走下去的教練，在球員心目中他是永遠的朋友！導演透過截然不同的記錄手法，呈現出感人肺腑的足球故事。同時原住民的問題，又再度被國人重視。撇開票房好與壞，讓國人從體育發展看到弱勢群體的問題，充分展現寓教於樂之功效。『每個人都有一個夢，每個人都在做一個夢！』
研究生愛流浪與遊民共枕
(2008-10-12)
楊雅筑
;
Department of Communication and Technology
;
傳播與科技學系
陳炫劭主修工業設計,想設計出不一樣的東西幫助社會邊緣人
傳統的侵蝕中國新困境
(2008-10-12)
陳怡秀
;
Department of Communication and Technology
;
傳播與科技學系
近年來，大陸宣稱改革開放、致力生產用力拼經濟，並在2008年舉辦了北京奧運，如此盛況，似乎將這個古老國度推向新的榮景。然而近來卻也陸陸續續傳出黑心貨、毒奶粉等醜聞，相隔一條海峽，其實我們知道的並不多。穿越沿海地區的繁榮，將鏡頭深入更深處的中國，地大物博的條件也許沖淡了國際趨勢衝擊下所帶來的經濟影響，然在中國國內本身，無論是學術、觀光方面，更以另一種姿態侵蝕傳統。
<一球成名> 帶著夢想飛翔
(2008-10-12)
郭大齊
;
Department of Communication and Technology
;
傳播與科技學系
一系列三集的電影隨著主角由對足球的興趣到追尋著夢想刻服著困難到迎來的成功
手繪風走入校園時尚界
(2008-10-12)
洪上筑
;
Department of Communication and Technology
;
傳播與科技學系
專屬變成現在的一種流行每個人都想要一頂專屬於自己的帽子或是配件在交大有許多的地下設計師來談談他們對這樣一個手繪網帽的看法吧!
《目送》細說人生大問
(2008-10-12)
蔡尚翰
;
Department of Communication and Technology
;
傳播與科技學系
「我慢慢地、慢慢地了解到，所謂父女母子一場，只不過意味著，你和他的緣分就是今生今世不斷地在目送他的背影漸行漸遠。」-----《目送》
《FOUR BLONDES》女人當自強
(2008-10-12)
洪效凡
;
Department of Communication and Technology
;
傳播與科技學系
慾望城市作者－甘蒂絲‧布希奈爾再次以詼諧的手法，表現都會男女的愛情與性愛觀。四個金髮美女，四個精彩故事。
殘憶往昔
(2008-10-12)
楊睿愷
;
Department of Communication and Technology
;
傳播與科技學系
所有的不堪回首，只是為了積累成現在。
散播hiphop種子的農夫
(2008-10-12)
陳妙寧
;
Department of Communication and Technology
;
傳播與科技學系
一個香港音樂組合