Browsing by Issue Date, starting with "2004-10-20"

Now showing 1 - 20 of 69321

High-performance bulk and thin-film microstrip transmission lines on VLSI-standard Si substrates
(2004-10-20)
Chen, CC
;
Hung, BF
;
Chin, A
;
McAlister, SP
;
電子工程學系及電子研究所
Microstrip transmission lines with very low power loss of 0.4 dB/mm at 50 GHz have been fabricated on Si substrates using an optimized ion-implantation process. These devices have the inherent advantages of smaller chip Size and better power performance than CPW lines. Using the same approach, high-performance thin-film microstrip lines are also developed, showing a loss of 0.9 dB/mm at 20 GHz. This approach is compatible with existing VLSI backend layout technology. (C) 2004 Wiley Periodicals, Inc.
Characterization and composition evolution of multiple-phase nanoscaled ceramic powders produced by laser ablation
(2004-10-20)
Lin, SC
;
Chen, SY
;
Cheng, SY
;
交大名義發表
;
National Chiao Tung University
Nanosized ceramic powder was prepared by laser ablation under different atmospheres using a ceramic target composed of ZrO2, TiO2, ZnO and Al2O3. Physical characteristics and microstructure of nanoparticles, including particle morphology, phase transformation, powder compositions and far-infrared emissivity, have been investigated. The laser-ablated nanoparticles exhibit two kinds of particle size distribution with 7-15 (70-90%) and 40-100 nm (10-30%). Nanoparticles synthesized at lower laser fluences show poor crystallinity but rich Zn composition. While increasing laser fluence, better crystalline nanoparticles with rich Zr composition were obtained. It was found that both composition and morphology of nanoparticles change with laser fluence. The average far-infrared emissivity of the nanoparticles varies with crystallinity of nanoparticles. (C) 2004 Elsevier B.V. All rights reserved.
砷化鎵元件背面銅金屬化之製作方法
(2004-10-21)
李承士
;
張翼
本發明砷化鎵元件背面銅金屬化之製作方法，係將砷化鎵元件背面金屬化金屬由金改為銅，由於銅的阻值較低，且散熱與機械強度亦較金優異。因此，以銅作為金屬化金屬之元件，可改善元件的散熱、機械強度、導電度，更可增進元件的特性及可靠度。並藉由鎢(W)、氮化鎢(WN)、氮化鈦鎢(TiWN)等薄膜作為擴散阻障層，有效阻擋銅易擴散入砷化鎵基材而改變元件特性之問題。
Fiber-optic tunable filter and intensity modulater
(2004-10-21)
Nan-Kuang, Chen
;
Sien, Chi
;
Shiao-Min, Tseng
;
Fu-Yu, Tsai
A fiber-optic tunable filter and an intensity modulator respectively includes: a fiber having a polished surface and an evanescent-field; and a photonic crystal having plural cavities and a filler filled therein and attached to the polished surface, wherein the plural cavities and the filler decide a photonic band-gap of the photonic crystal and the photonic band-gap is adjusted to reflect a light with a specific wavelength through the evanescent interaction with the photonic crystal material. Based on the fiber side-polishing technique, all kinds of fiber active and passive devices are able to be manufactured easily, especially for a high speed intensity modulator using an EO (Electro-Optic) polymer as the filler.
The study of the sublimable six-coordinated aluminum quinolate with sulfonamide substitutents
(2004-10-21)
Cheng, JA
;
Chen, CH
;
Yang, HL
;
應用化學系
;
友訊交大聯合研發中心
A sublimationable blue-green host materials based on tris(8-hydroxyquinolato)aluminum, meridional tris(5-N-ethylanilinesulfonamide-8-quinolato) aluminum, mer-Al(Saq)(3), was investigated and characterized by thermogravimetric analysis (TGA) and H-1 nuclear magnetic resonance (NMR). Via molecular engineering, the sublimation enthalpy of mer-Al(Saq)(3) can be adjusted by introducing the N-ethylanilinesulfonamide substitutent. Its electroluminescence (EL) was also characterized by the device architecture of glass/ITO (200 nm)/CuPc (15 nm)/NPB (60 nm)/mer-Al(Saq)(3) (55 nm)/LiF (1 nm)/Al (200 nm). It shows a blue-green spectrum with blue-green of 1931 CIEx,y(0.25, 0.39). Our experiments revealed that the Al-N bond order might not be the major issue in sublimation process. (C) 2004 Elsevier B.V. All rights reserved.
三相無刷直流馬達鎖相式速度控制裝置及其方法
(2004-10-21)
王振宇
;
鄒應嶼
本發明係揭露一種三相無刷直流馬達鎖相式速度控制裝置及其方法，其係將馬達轉速回授訊號與轉速命令訊號經過自動頻率修正電路與自動相位修正電路後，分別產生頻率誤差量與相位誤差量，再利用一加法器將該二誤差量相加，經過迴路濾波器運算而得到新的控制訊號；且該轉速回授訊號係經過除頻電路處理，得以避免造成轉速回授誤差；另外，迴路濾波器產生的新控制訊號，經由脈波寬度調變器與定序器後產生開關訊號，以控制馬達的電樞電壓大小，修正馬達轉速，達到控制馬達轉速之目的者。
Fabrication of GaN-based nanorod light emitting diodes using self-assemble nickel nano-mask and inductively coupled plasma reactive ion etching
(2004-10-25)
Huang, HW
;
Kao, CC
;
Hsueh, TH
;
Yu, CC
;
Lin, CF
We report a novel method to fabricate GaN-based nanorod light emitting diodes (LEDs) with controllable dimension and density using self-assemble nickel (Ni) and Ni/Si3N4 nano-masks and inductively coupled plasma reactive ion etching (ICP-RIE). Under the fixed Cl-2/Ar flow rate of 50/20 sccm. ICP/Bias power of 400/100 W and chamber pressure of 0.67 Pa, the GaN-based nanorod LEDs were fabricated with density of 2.2 x 10(9) to 3 x 10(10) cm(-2) and dimension of 150-60 nm by self assemble Ni nano-masks with various size. The size of Ni/Si3N4 nano-mask was control by the thickness Ni film ranging 150-50 Angstrom and rapid thermal annealing condition. The technique offers a controllable method of fabrication of GaN-based nanorod LEDs and should be applicable for fabrication of the others III-V nanoscale photonic and electronic devices. (C) 2004 Elsevier B.V. All rights reserved.
Method for manufacturing a combined solid immersion lens (SIL) and submicron aperture, and device thereof
(2004-10-26)
Hsu
;
Wensyang
;
Chou
;
Hsueh Liang
;
Tien
The invention relates to an integrated method for manufacturing a combined solid immersion lens (SIL) and submicron aperture, and device thereof, comprising depositing a sacrificial layer on a substrate, coating a photoresist on the sacrificial layer and using photo-lithography to form an aperture on the photoresist, applying reflow and etching process to remove the sacrificial layer below the aperture, depositing a conductive material on the photoresist and performing electroplating to reduce the aperture size, then coating another photoresist and using photo-lithography to form a cylindrical phtoresist above the aperture, applying a high temperature thermal reflow to form a microlens, and finally removing the substrate to obtain an optical read/write apparatus with a combined solid immersion lens (SIL) and submicron aperture.
Monodisperse nanoparticle synthesis by an atmospheric pressure plasma process: An example of a visible light photocatalyst
(2004-10-27)
Bai, HL
;
Chen, CC
;
Lin, CS
;
Den, W
;
Chang, CL
An atmospheric pressure plasma-enhanced nanoparticle synthesis (APPENS) process was proposed to produce a titania-based visible light photocatalyst. The titanium tetraisopropoxide (TTIP) precursor was vaporized with a N-2 carrier gas and entered a nonthermal AC plasma system. The N-2 gas was dissociated into N atoms by the plasma energy, and then they were doped into the precursor vapors. The produced TiO2-xNx nanoparticles were highly uniform and adjustable in size. The titania-based particle sizes ranged from 25 to 40 nm, and they depended on the precursor ratio of TTIP/H-2O. In addition to producing the photocatalytic particles, the APPENS process has a potential application as a continuous-flow nanosize monodisperse aerosol generator.
Using intensity and wavelength division multiplexing for fiber Bragg grating sensor system
(2004-10-28)
Sien, Chi
;
Hong-Yih, Tseng
;
Peng-Chun, Peng
;
Jia-He, Lin
The present invention provides a fiber Bragg grating sensor system, which comprises a light-division device having receiving-sending terminals and sensing terminals, a light generating device and a photo detector coupled with receiving-sending terminal of a light-division device, sensing fibers coupled with the sensing terminals, said sensing fiber comprising a fiber Bragg grating, a information processor connecting with said photo detector. The light-division device distribute different optical energy ratio from said receiving-sending terminals to said sensing terminals. The intensity and wavelength division multiplexing can make different intensity for the information addressed of different sensing fiber on the same optical channel to enhance the sensing capacity of fiber Bragg grating sensor system.
Process for preparing positive-negative blended optical retardation film, positive-negative blended optical retardation film, and liquid crystal display element and liquid crystal display device using the same
(2004-10-28)
Long-Hai, Wu
;
Chain-Shu, Hsu
;
Ching-Hua, Ting
The invention provides a process for preparing a positive-negative-blended optical retardation film comprising coating a solution consisting of discotic and rod-like liquid crystal onto an alignment layer after unidirectionally rubbing treatment on a substrate, subsequently heating the coating to obtain a film consisting of discotic and rod-like liquid crystal with uniform arrangement, and then curing it through exposing under a UV-irradiation to obtain a positive-negative-blended optical retardation film with excellent viewing angle; and a positive-negative-blended optical retardation film. Further, the invention also provides a liquid crystal element and a liquid crystal device having said positive-negative-blended optical retardation film.
Robust image watermarking based on multiple description vector quantisation
(2004-10-28)
Pan, JS
;
Hsin, YC
;
Huang, HC
;
Huang, KC
;
電子工程學系及電子研究所
An innovative scheme for watermarking based on vector quantisation for transmitting over noisy channels is proposed. By modifying multiple description vector quantisation for watermark embedding and extraction, simulation results not only demonstrate effective transmission of the watermarked image, but reveal the robustness of the extracted watermark.
管管作品十三首
(2004-10-30)
管管
管管作品十三首
(2004-10-30)
管管
Characteristics method with cubic-spline interpolation for open channel flow computation
(2004-10-30)
Tsai, TL
;
Chiang, SW
;
Yang, JC
;
防災與水環境研究中心
;
Disaster Prevention and Water Environment Research Center
In the framework of the specified-time-interval scheme, the accuracy of the characteristic method is Greatly related to the form of the interpolation. The linear interpolation was commonly used to couple the characteristics method (LI method) in open channel flow computation. The LI method is easy to implement, but it leads to an inevitable smoothing of the solution. The characteristics method with the Hermite cubic interpolation (HP method, originally developed by Holly and Preissmann, 1977) was then proposed to largely reduce the error induced by the LI method. In this paper, the cubic-spline interpolation on the space line or on the time line is employed to integrate with characteristics method (CS method) for unsteady flow computation in open channel. Two hypothetical examples, including gradually and rapidly varied flows, are used to examine the applicability of the CS method as compared with the LI method, the HP method, and the analytical solutions. The simulated results show that the CS method is comparable to the HP method and more accurate than the LI method. Without tackling the additional equations for spatial or temporal derivatives, the CS method is easier to implement and more efficient than the HP method. Copyright (C) 2004 John Wiley Sons, Ltd.
管管作品十三首
(2004-10-30)
管管
管管作品十三首
(2004-10-30)
管管
管管作品十三首
(2004-10-30)
管管
管管作品十三首
(2004-10-30)
管管
管管作品十三首
(2004-10-30)
管管