Browsing by Issue Date, starting with "2015-04-20"

Now showing 1 - 20 of 21933

A Ruthenium-Based Biomimetic Hydrogen Cluster for Efficient Photocatalytic Hydrogen Generation from Formic Acid
(2015-04-20)
Chang, Chin-Hao
;
Chen, Mei-Hua
;
Du, Wan-Shan
;
Gliniak, Jacek
;
Lin, Jia-Hoa
A ruthenium-based biomimetic hydrogen cluster, [Ru-2(CO)(6)(-SCH2CH2CH2S)] (1), has been synthesized and, in the presence of the P ligand tri(o-tolyl)phosphine, demonstrated efficient photocatalytic hydrogen generation from formic acid decomposition. Turnover frequencies (TOFs) of 5500h(-1) and turnover numbers (TONs) over 24700 were obtained with less than 50ppm of the catalyst, thus representing the highest TOFs for ruthenium complexes as well as the best efficiency for photocatalytic hydrogen production from formic acid. Moreover, 1 showed high stability with no significant degradation of the photocatalyst observed after prolonged photoirradiation at 90 degrees C.
Comparative study of intracavity KTP-based Raman generation between Nd:YAP and Nd:YAG lasers operating on the F-4(3/2) -> I-4(13/2) transition
(2015-04-20)
Huang, Y. J.
;
Chen, Y. F.
;
Chen, W. D.
;
Zhang, G.
;
電子物理學系
Extending the spectral wavelengths of the diode-pumped Nd-doped lasers at 1.3 mu m with the KTP crystal in the intracavity Raman configuration is reported for the first time to the best of our knowledge. A systematic comparison is performed to show that a better optical conversion efficiency for the Nd:YAP/KTP Raman laser could be achieved thanks to the higher peak power and linearly polarized radiation at 1341 nm, whereas up to four Stokes emission lines are generated from the Nd: YAG/KTP Raman laser as a result of the fundamental dual-color operation at 1319 and 1338 nm. The maximum Stokes output power of the developed Nd: YAP/KTP Raman laser reaches 1.04 W under an incident pump power of 16 W and a pulse repetition rate of 10 kHz, corresponding to the diodeto-Stokes conversion efficiency as high as 6.5%. The largest pulse energy and highest peak power are evaluated to be up to 104 mu J and 34.7 kW, respectively. (C) 2015 Optical Society of America
Dual-comb self-mode-locked monolithic Yb:KGW laser with orthogonal polarizations
(2015-04-20)
Chang, M. T.
;
Liang, H. C.
;
Su, K. W.
;
Chen, Y. F.
;
電子物理學系
The dependence of lasing threshold on the output transmission is numerically analyzed to find the condition for the gain-to-loss balance for the orthogonal N-p and N-m polarizations with a N-g-cut Yb: KGW laser crystal. With the numerical analysis, an orthogonally polarized dual-comb self-mode- locked operation is experimentally achieved with a coated Yb: KGW crystal to form a monolithic cavity. At a pump power of 5.2 W, the average output power, the pulse repetition rate, and the pulse duration are measured to be 0.24 (0.6) W, 25.8 (25.3) GHz, and 1.06 (1.12) ps for the output along the N-p (N-m) polarization. (C)2015 Optical Society of America
Incomplete immunity to backscattering in chiral one-way photonic crystals
(2015-04-20)
Cheng, Pi-Ju
;
Tien, Chung-Hao
;
Chang, Shu-Wei
;
光電工程學系
;
Department of Photonics
We show that the propagating modes in a strongly-guided chiral one-way photonic crystal are not backscattering-immune even though they are indeed insensitive to many kinds of scatters. Since these modes are not protected by the nonreciprocity, the backscattering does occur under certain circumstances. We use a perturbative method to derive criteria for the prominent backscattering in such chiral structures. From both our theory and numerical examinations, we find that the amount of backscattering critically depends on the symmetry of scatters. Additionally, for these chiral photonic modes, disturbances at the most intense parts of field profiles do not necessarily lead to the most effective backscattering. (C) 2015 Optical Society of America
24-W cryogenically cooled Nd:YAG monolithic 946-nm laser with a slope efficiency > 70%
(2015-04-20)
Cho, C. Y.
;
Lee, C. Y.
;
Chang, C. C.
;
Tuan, P. H.
;
Huang, K. F.
A high-power efficient monolithic Nd: YAG 946-nm laser is demonstrated at the cryogenic temperature. By exploring the absorption and the fluorescence spectra of the Nd: YAG crystal, it reveals the fact that the absorption bandwidth at 808 nm is narrowing and the fluorescence intensity at 1061 nm is significant enhanced when the temperature is decreased. The temperature dependence of the lasing threshold at 946 nm is found to display a minimum value near a temperature of 170 K. At an incident pump power of 34.5 W, the local heating leads the optimum temperature to be approximately 120 K and the maximum output power can reach 24.4 W with the conversion efficiency of 71% as well as the slope efficiency up to 75%. (C)2015 Optical Society of America
交大e-News第184期-交通大學57週年校慶勁竹慶57榮耀新世紀
(2015-04-20)
國立交通大學秘書室
;
Secretariat
Biological imaging with nonlinear photothermal microscopy using a compact supercontinuum fiber laser source
(2015-04-20)
He, Jinping
;
Miyazaki, Jun
;
Wang, Nan
;
Tsurui, Hiromichi
;
Kobayashi, Takayoshi
Nonlinear photothermal microscopy is applied in the imaging of biological tissues stained with chlorophyll and hematoxylin. Experimental results show that this type of organic molecules, which absorb light but transform dominant part of the absorbed energy into heat, may be ideal probes for photothermal imaging without photochemical toxicity. Picosecond pump and probe pulses, with central wavelengths of 488 and 632 nm, respectively, are spectrally filtered from a compact supercontinuum fiber laser source. Based on the light source, a compact and sensitive super-resolution imaging system is constructed. Further more, the imaging system is much less affected by thermal blurring than photothermal microscopes with continuous-wave light sources. The spatial resolution of nonlinear photothermal microscopy is similar to 188 nm. It is similar to 23% higher than commonly utilized linear photothermal microscopy experimentally and similar to 43% than conventional optical microscopy theoretically. The nonlinear photothermal imaging technology can be used in the evaluation of biological tissues with high-resolution and contrast. (C) 2015 Optical Society of America
鑽石磊晶成長方法
(2015-04-21)
張立
;
吳秉勳
;
丘坤安
一種鑽石磊晶成長方法，包含：提供一鑽石基板；沉積至少一金屬層於鑽石基板上，其中金屬層之金屬成分係滿足與鑽石晶格差異性小於15%以及溶碳率小於2wt%兩種特性至少其中之一之金屬；通入一反應氣氛；以及沉積一鑽石磊晶層於鑽石基板與金屬層上。藉由先形成一金屬層結構，以紓解成長磊晶鑽石薄膜所產生的薄膜應力，避免薄膜產生裂痕。如此則可獲得具有足夠膜厚且品質良好之磊晶層。
合作式頻譜估測與定位方法及系統
(2015-04-21)
伍紹勳
;
黃汀華
;
柯俊先
一種合作式頻譜估測與定位方法及系統。該方法包含：多個次級使用者行動裝置將其位置資訊及從多個優先權使用者發射器所感測到的功率信號之接收信號強度值傳送至多個感知無線電基地台；該等感知無線電基地台將該等接收信號強度值以及該等次級使用者行動裝置之位置資訊傳送至一資料匯集與處理中心；及該資料匯集與處理中心利用一學習演算法，根據該等次級使用者行動裝置之接收信號強度值以及位置資訊，運算出該等優先權使用者發射器之數目及位置。
可調性視訊多層編碼控制快速決策模式演算法
(2015-04-21)
彭文孝
;
蔣迪豪
;
蔡閏旭
本發明揭示一種可調性視訊多層編碼控制快速決策模式演算法。該方法係使用時間性編碼模式分數(Temporal Mode Score,TMS)之概念，可以準確的預測出增進層的編碼模式，並且找出基礎層和增進層的編碼模式並可隨視訊序列的性質做不同的配對計算。
電子裝置及其導航方法
(2015-04-21)
宋開泰
;
洪上畯
一種電子裝置及其導航方法，所述導航方法包括下列步驟。首先，透過無線感測網路接收召喚訊號，其中召喚訊號來自於目標物。接著，分析目標物與電子裝置之間的位置關係以產生第一速度。之後，擷取影像組，並分析影像組與目標物的影像關係以產生第二速度。繼之，計算關聯於位置關係的權重值，並依據權重值、第一速度以及第二速度計算移動速度，以及透過移動速度控制電子裝置往目標物移動的移動情形。
生醫感測器及其電極結構
(2015-04-21)
廖倫德
;
陳昱翰
;
趙昌博
;
林進燈
;
孫暉功
一種生醫感測器之電極結構，包含一可撓性導電基材及多個金屬柱狀導電探針，其中導電探針中係凸出設置於導電基材上並用以與一受試者接觸以接收一生理電波訊號。本發明改善濕式電極及微結構電極之缺點，提供更穩定而不隨時間衰減之訊號，並可達成即時與長效的生理電波訊號量測。此外，本發明亦揭示一種生醫感測器。
具有奈米雙晶銅之電性連接體、其製備方法、以及包含其之電性連接結構
(2015-04-21)
陳智
;
劉道奇
;
邱韋嵐
本發明係有關於一種具有奈米雙晶銅之電性連接體、其製備方法、以及包含其之電性連接結構。本發明之具有雙晶銅之電性連接結構之製備方法，係包括步驟：(A)提供一第一基板；(B)於該第一基板之部分表面形成一奈米雙晶銅層；(C)將一焊料配置於該奈米雙晶銅層之表面；以及(D)進行回焊以使該焊料與奈米雙晶銅層接合，其中，該焊料至少部分轉換為一介金屬化合物(intermetallic compound,IMC)層，該介金屬化合物層係包括有一Cu3Sn層。本發明技術使得焊料與奈米雙晶銅所反應在介金屬化合物與銲錫界面的孔洞減少，提升接點可靠度。
路口號誌資訊處理方法以及系統
(2015-04-21)
莊宜達
;
粘家盛
;
經嘉豪
;
易志偉
一種路口號誌資訊處理方法包含以下步驟：接收數個歷史車輛於一路口之數筆停走事件訊息。根據於路口之停走事件訊息中之停走時間、停走位置以及停走事件類別，計算路口之至少一交通號誌之一號誌趨勢資訊。根據號誌趨勢資訊，推估路口之一當前交通資訊。
High-efficiency and low assembly-dependent chip-scale package for white light-emitting diodes
(2015-04-21)
Huang, Che-Hsuan
;
Chen, Kuo-Ju
;
Tsai, Ming-Ta
;
Shih, Min-Hsiung
;
Sun, Chia-Wei
This article presents a chip-scale package (CSP) with conformal and uniform structures for white light-emitting diodes used in lighting and backlight unit (BLU) applications. The CSP structures produce higher light extraction efficiency and lower assembly-dependent packaging compared with conventional surface-mounted devices (SMDs). Simulation results show that compared with SMDs, the luminous efficiency of CSP structures is 8.81% higher in lighting applications and 9.43% higher in BLU applications. This is likely due to light loss in the light bowl of the SMDs. Moreover, CSPs with a conformal phosphor structure exhibit low assembly dependence and redundancy, and rb-CSPs with a conformal structure are a more effective light source in both lighting and BLU applications. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
INTEGRATED CONTACTLESS SIGNAL TRANSFER APPARATUS
(2015-04-23)
CHUNG Shyh-Jong
;
WANG Hsiao-Ning
An integrated contactless signal transfer apparatus makes use of the rule of filter design to transfer signal from a chip to the transmission lines of a PCB. The integrated contactless signal transfer apparatus includes a substrate, a chip disposed on the substrate, a first resonator unit disposed on the chip for receiving a first signal with a first frequency generated from the chip, a PCB positioned at a distance opposite to the substrate, and a second resonator unit disposed on the PCB. The first signal passes through the first resonator unit to generate a contactless coupling between the first and second resonator units, so the second resonator unit generates a second signal. The second signal has a second frequency substantially equal to the first frequency.
DATA STORAGE DEVICE AND COMPUTING SYSTEM WITH THE SAME
(2015-04-23)
Wong Wing Hung
;
Wu Tung-Yu
;
Lee Chen-Yi
;
Chang Hsi-Chia
;
Hsu Shu-Yu
A data storage device is in communication with a host through a bus. The data storage device includes a storage medium and a controlling unit. The controlling unit is connected with the host and the storage medium for receiving an analysis data, or storing a write data into the storage medium or retrieving a read data from the storage medium to the host according to a command from the host. The controlling unit includes an arithmetic logic unit. The arithmetic logic unit has a built-in algorithm for analyzing and processing the analysis data, the write data or the read data, thereby generating an analysis result. Moreover, the algorithm may be updated or expanded by the host.
COLOR-BASED MUSIC OUTPUT SYSTEM AND METHOD THEREOF
(2015-04-23)
KUO Yi-Ting
;
CHUANG Ming-Chuen
;
Ou-Yang Mang
The present invention discloses a color-based music output system and a method thereof. The system of the present invention comprises a pickup unit receiving a musical signal; a recognition unit electrically connected with the pickup unit to receive the musical signal and recognizing musical elements from the musical signal; a conversion unit electrically with the recognition unit to receive the musical elements and converting the musical elements into colored musical notes; and a processing unit electrically connected with the pickup unit, the recognition unit and the conversion unit, receiving the colored musical notes, and outputting a colored musical notation corresponding to the colored musical notes. The present invention provides an easy-to-read colored musical notation to simplify the conventional five-line staff and overcome the disadvantages thereof and also provides an innovative color-based music output system to make users read musical notations easier.
Single-crystalline CuO nanowires for resistive random access memory applications
(2015-04-27)
Hong, Yi-Siang
;
Chen, Jui-Yuan
;
Huang, Chun-Wei
;
Chiu, Chung-Hua
;
Huang, Yu-Ting
Recently, the mechanism of resistive random access memory (RRAM) has been partly clarified and determined to be controlled by the forming and erasing of conducting filaments (CF). However, the size of the CF may restrict the application and development as devices are scaled down. In this work, we synthesized CuO nanowires (NW) (similar to 150 nm in diameter) to fabricate a CuO NW RRAM nanodevice that was much smaller than the filament (similar to 2 mu m) observed in a bulk CuO RRAM device in a previous study. HRTEM indicated that the Cu2O phase was generated after operation, which demonstrated that the filament could be minimize to as small as 3.8 nm when the device is scaled down. In addition, energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) show the resistive switching of the dielectric layer resulted from the aggregated oxygen vacancies, which also match with the I-V fitting results. Those results not only verify the switching mechanism of CuO RRAM but also show RRAM has the potential to shrink in size, which will be beneficial to the practical application of RRAM devices. (C) 2015 AIP Publishing LLC.
Side-Chain-Bulk Effects on the Molecular Packing and Photovoltaic Performance of Benzotrithiophene-Benzooxadiazole Conjugated Copolymers
(2015-04-27)
Lan, Shang-Che
;
Chang, Chiao-Kai
;
Wang, Yi-Chien
;
Wei, Kung-Hwa
;
材料科學與工程學系
Two alternating donor-acceptor conjugated polymers, PBTTBO-C13C11 and PBTTBO-C13C8, comprising 5-alkylbenzo[1,2-b:3,4-b:5,6-d]trithiophene (BTT) as the donor and 4,7-bis(4-dodecylthien-2-yl)benzo[1,2,5]oxadiazole (BO) as the acceptor, with different alkyl side-chain architectures on their BTT units are synthesized, and their bulk heterojunction photovoltaic properties when blended with the fullerene PC71BM are characterized. Even a slight change in the length of the alkyl chain of the BTT units influences the steric bulk to such a degree that it substantially affects the molecular packing of the polymers and the performance of their photovoltaic devices. The bulkier side chains of the polymer PBTTBO-C13C11 not only prevent its crystallization, but also suppress its light-absorption coefficient relative to that of PBTTBO-C13C8, as evidenced by X-ray diffraction and UV/Vis absorption studies, presumably because of weakened intermolecular interactions. Moreover, the polymer bearing bulkier side chains, PBTTBO-C13C11, is less miscible with PC71BM than PBTTBO-C13C8, and this characteristic determines the morphology of their annealed blended films, as shown by TEM studies. The best efficiency is obtained with a device containing an annealed PBTTBO-C13C8/PC71BM (1/2 w/w) active layer that was maintained at 120 degrees C for 10 min, which shows a power conversion efficiency of 6.2%, an open-circuit voltage of 0.75 V, a short-circuit current density of 12.6 mAcm(-2), and a fill factor of 66%.