Browsing by Issue Date, starting with "2005-09-15"

Now showing 1 - 20 of 66019

Efficient periodically poled stoichiometric lithium tantalate optical parametric oscillator for the visible to near-infrared region
(2005-09-15)
Tu, SY
;
Kung, AH
;
Gao, ZD
;
Zhu, SN
;
光電工程學系
A compact, efficient optical parametric oscillator (OPO) for the visible to near-infrared region based on periodically poled stoichiometric lithium tantalate pumped by a frequency-doubled multikilohertz Q-switched Nd:YAG laser is demonstrated. Up to 61% photon conversion with a 71% slope efficiency for photon conversion from 532 nm to the signal radiation was measured. We observed that the efficient conversion diminished the potential for photorefractive damage induced by the 532 am radiation in the crystal and made sustained operation of the OPO device possible. (c) 2005 Optical Society of America.
管管作品三首
(2005-09-15)
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管管作品三首
(2005-09-15)
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管管作品三首
(2005-09-15)
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Nucleation and growth behavior of well-aligned ZnO nanorods on organic substrates in aqueous solutions
(2005-09-15)
Lin, CC
;
Chen, SY
;
Cheng, SY
;
材料科學與工程學系
;
Department of Materials Science and Engineering
A low-temperature synthetic route was used to prepare well-aligned arrays of oriented ZnO nanorods on organic substrates coated with polystyrene beads (PS) in an aqueous solution. The corresponding growth behavior and photoluminescence properties of ZnO nanorods were analyzed. It was found that the ZnO nanorods are initially nucleated from the ZnO monolayer under the concave regions of the PS layers and preferentially grown along [0 0 0 1] direction. High-resolution transmission electron microscopy (HRTEM) observation reveals that the ZnO nanorods tend to coalesce together with other adjacent nanorods to form a larger ZnO crystal in the later growth stage. The room-temperature photoluminescence spectra demonstrate that a stronger ultraviolet (UV) emission with a broad yellow emission around 575 nm was observed for the ZnO nanorods grown on the organic substrates and the relative intensity ratio of ultraviolet emission to yellow emission depends on the growth periods of time. This simple approach demonstrates great potential for optoelectronic devices because it can produce large-scale highly well-aligned ZnO nanorods on the flexible organic substrates at lower temperatures. (c) 2005 Elsevier B.V. All rights reserved.
Fe3O4/TiO2 core/shell nanoparticles as affinity probes for the analysis of phosphopeptides using TiO2 surface-assisted laser desorption/ionization mass spectrometry
(2005-09-15)
Chen, CT
;
Chen, YC
;
交大名義發表
;
National Chiao Tung University
Columns packed with microsized titanium dioxide particles have been used effectively as precolumns for enriching phosphopeptides from complex mixtures. Nano-sized titanium dioxide particles have a higher specific surface area and, hence, potentially higher trapping capacities toward phosphopeptides than do microsized particles. Thus, in this study, we employed TiO2-coated magnetic (Fe3O4/TiO2 core/shell) nanoparticles to selectively concentrate phosphopeptides from protein digest products. Because of their magnetic properties, the Fe3O4/TiO2 core/shell nanoparticles that are conjugated to the target peptides can be isolated readily from the sample solutions by employing a magnetic field. In this paper, we also demonstrate that the Fe3O4/TiO2 core/ shell nanoparticles behave as an effective SALDI matrix: our upper detectable mass limit was similar to 24 000 Da, whereas the detection limit for peptides was in the low-femtomole range. That is to say, the target analytes trapped by the Fe3O4/TiO2 nanoparticles can be identified by introducing the particles directly into the mass spectrometer for TiO2-SALDI-MS analysis without the need for any further treatment. For example, elution steps are not necessary when using this approach. In addition, the trapping selectivity of these Fe3O4/TiO2 nanoparticles toward phosphopeptides was quite good. These properties combine to result in the low detection limits. The lowest detectable concentration of phosphopeptides that we analyzed using this approach was 500 pM for a 100-mu L tryptic digest solution of beta-casein; this level is much lower than that which can be obtained using any other currently available method.
Method for inter-cluster communication that employs register permutation
(2005-09-15)
Jen, Chein-Wei
;
Lin, Tay-Jyi
;
Lee, Chen-Chia
;
Chang, Chin-Chi
;
Liu, Chih-Wei
The present invention is a method for inter-cluster communication that employs register permutation by dynamically mapping the registers to the functional units. Because only the mapping between registers and functional units is changed and no actual data movement occurs, the present invention greatly diminishes the power consumption. Owing to the inter-cluster communication mechanism, a centralized register file can be replaced with small register sub-blocks, where the silicon area is greatly reduced, and the access time and the power consumption are also diminished.
管管作品三首
(2005-09-15)
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Direct generation of a 10 GHz 816 fs pulse train from an erbium-fiber soliton laser with asynchronous phase modulation
(2005-09-15)
Hsiang, WW
;
Lin, CY
;
Tien, MF
;
Lai, YC
;
光電工程學系
By employing the technique of asynchronous mode locking, we have successfully demonstrated direct generation of stable 10 GHz 816 fs pulse trains with a supermode-suppression ratio > 70 dB from a hybrid mode-locked Er-fiber laser. When the modulation frequency deviates from the cavity harmonic frequency by 15-40 kHz, stable femtosecond soliton pulses are formed. Our results demonstrate that asynchronous mode locking can act as an effective mechanism for achieving a shorter pulse width and for stabilizing high-repetition-rate pulse trains in soliton fiber lasers. (c) 2005 Optical Society of America.
管管作品三首
(2005-09-15)
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Efficient mode coupling technique between photonic crystal heterostructure waveguide and silica waveguides
(2005-09-15)
Chau, YF
;
Yang, TJ
;
Gu, BY
;
Lee, WD
;
電子物理學系
We report an efficient mode coupling technique between silica waveguides (SWGs) and a planar photonic crystal heterostructure waveguide (PPCHWG) composed of two semi-infinite two-dimensional photonic crystals (PCs) with different filling fractions. By calculating the transmittance at output end of SWG, we find that the designed structures possess the merits of high coupling efficiency and relaxing fabricating tolerance. The maximal transmittance exceeds 90% at a wavelength near 1.65 mu m. The high transmission efficiency of PPCHWGs can be achieved without introducing any defect structures for optimal mode matching. Besides, the width of PPCHWGs can be flexibly adjusted via changing the separation of two component PCs in PC heterostructures. (c) 2005 Elsevier B.V. All rights reserved.
管管作品三首
(2005-09-15)
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管管作品三首
(2005-09-15)
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Nanoprobe-based affinity mass spectrometry for selected protein profiling in human plasma
(2005-09-15)
Chou, PH
;
Chen, SH
;
Liao, HK
;
Lin, PC
;
Her, GR
In recent decades, magnetic nanoparticles have emerged as a promising new platform in biomedical applications, particularly bioseparations. We have developed an immunoassay using antibody-conjugated magnetic nanoparticles as an efficient affinity probe to simultaneously preconcentrate and isolate targeted antigens from biological media. We combined this probe with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI MS) to profile proteins in diluted human plasma. The nanoparticles were designed to detect several disease-associated proteins and could be used directly in MALDI MS without an elution step, thereby facilitating multiple antigen screening and the characterization of antigen variants. Plasma antigens bound rapidly (similar to 10 min) to the antibody-conjugated nanoparticles, allowing the assay to be performed within 20 min. With sensitivity of detection in the femtomole range, the nanoscale immunoassay is superior to assays using microscale particles. We applied our method to comparative protein profiling of patients with gastric cancer and healthy individuals and found differential protein expression levels associated with the disease as well as individuals. Given the flexibility of manipulating functional groups on the nanoprobes, their low cost, robustness, and simplicity of the assay, our approach shows promise for targeted proteome profiling in clinical settings.
Method and apparatus for interframe wavelet video coding
(2005-09-15)
Tsai, Sam S.
;
Hang, Hsueh-Ming
;
Tsai, Chia-Yang
;
Chiang, Tihao
The present invention provides a method and apparatus for interframe wavelet video coding which comprises Motion Compensated Temporal Filtering and Discrete Wavelet Transform Coding to obtain: 1. compressed quantification error and scalability on temporal analysis and spatial analysis, and 2. scalability on Motion Information (MI) data so that the performance of wavelet video coding on low bitrate can be improved. A method for partitioned coding on MI is proposed: 1. to partitioned coding a motion vector according to the spatial block, the temporal frame, or the numeric precision; 2. to partition motion vectors to a plurality of layers, and, when the video bitstream changes, only the required MI is put into the final bitstream. Accordingly, the performance of wavelet video compression on low bitrate is greatly improved while the compression rate on high bitrate is only a little lower.
Welding flux for use in arc-welding of stainless steels, method of welding stainless steel members using the welding flux
(2005-09-15)
Chou, Chang-Pin
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Huang, Her-Yueh
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Shyu, Sheang-Wen
;
Tseng, Kueng-Hueng
;
Yang, Tsung-Chieh
A welding flux for use in welding stainless steel parts to increase welding penetration, consisting essentially a base material obtained from manganese peroxide (MnO2), and an activator selected from a material group that includes zinc oxide (ZnO), silicon dioxide (SiO2), chromium oxide (CrO2), titanium dioxide (TiO2), molybdenum dioxide (MoO2), and iron oxide (Fe2O2).
Theories and algorithms for 3-D root canal model construction
(2005-09-15)
Dong, J
;
Hong, SY
;
Hasselgren, G
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents theories and algorithms for 3-D root canal model construction from 2-D X-ray images in a clinically practical way: (1) the geometrical rectification algorithm for correcting distorted 2-D X-ray images, (2) the transformation algorithms from 2-D X-ray image coordinate system to unified 3-D reference coordinate system, (3) the merging algorithms and theory for obtaining spatial root canal centerline by intersecting two surfaces with assumed parallel projection, and (4) the elliptical theory for exploring the root canal cross-sectional geometry. Using those theories and algorithms, three 3-D computer models constructed from teeth samples are presented to show the feasibility. The internal geometrical structure provided by 3-D computer graphics enables the clinician and the patient to comprehend root canal morphology efficiently, and the destructive access preparation before a clinician's inspection may be avoided during clinic practice. (c) 2005 Elsevier Ltd. All rights reserved.
大一新生圖書館資訊之旅
(國立陽明大學, 2005-09-16)
陽明電子報編輯小組
為協助大一新生在未來求學過程中，能快速有效查尋所需資料，充份掌握圖書館提供的資源與服務，圖書館特舉辦「大一新鮮人圖書館之旅」活動，歡迎新生踴躍參加! 敬請各班導師能將此訊息轉告學生 .....
醫學分子科技新知研討會
(國立陽明大學, 2005-09-16)
陽明電子報編輯小組
日期：94年9月24日(星期六) 08:30~17:00 地點：國立陽明大學活動中心表演廳(台北市北投區立農街二段155號) 主辦單位：國立陽明大學醫學生物技術研究所
台聯大四校通識中心教學經驗分享暨教學成長工作坊座談會
(國立陽明大學, 2005-09-16)
陽明電子報編輯小組
由台灣聯合大學四所學校（中央大學、交通大學、清華大學、陽明大學）通識教育中心組成的「教學經驗分享暨教學成長工作坊」，於9月8日在陽明通識教育中心223室舉辦一場座談會，內容以台聯大四校通識中心教師的教學經驗分享為主，希望藉由老師教學經驗間的分享與學習，提升教學品質與學生學習效果