Browsing by Issue Date, starting with "2016-12-07"

Now showing 1 - 20 of 15811

Further resolution enhancement of high-sensitivity laser scanning photothermal microscopy applied to mouse endogenous
(2016-12-07)
Nakata, Kazuaki
;
Tsurui, Hiromichi
;
Kobayashi, Takayoshi
;
電子物理學系
;
Department of Electrophysics
Photothermal microscopy has intrinsically super resolution capability due to the bilinear dependence of signal intensity of pump and probe. In the present paper, we have made further resolution improvement of high-sensitivity laser scanning photothermal microscopy by applying non-linear detection. By this, the new method has the following advantages: (1) super resolution with 61% and 42% enhancement from the diffraction limit values of the probe and pump wavelengths, respectively, by a second-order non-linear scheme, (2) compact light source using inexpensive conventional diode lasers, (3) wide applicability to nonfluorescent materials such as gold nanoparticles (GNPs) and hematoxylin-eosin stained biological samples, (4) relative robustness to optical damage, and (5) a high-frame rate using a Galvano mirror. The maximum resolution is determined to be 160 nm in the second-order non-linear detection mode and 270 nm in the linear detection mode by the PT signal of GNPs. The pixel rate and frame rate for 300 x 300 pixel image are 50 mu s and 4.5 s, respectively. The pixel and frame rate are shorter than the rates, which are 1ms and 100 s, respectively, using the piezo-driven stage system. Published by AIP Publishing.
New D-A1-D-A2-Type Regular Terpolymers Containing Benzothiadiazole and Benzotrithiophene Acceptor Units for Photovoltaic Application
(2016-12-07)
Keshtov, Mukhamed L.
;
Khokhlov, Alexei R.
;
Kuklin, Serge A.
;
Chen, Fang-Chung
;
Koukaras, Emmanuel N.
Two novel regular terpolymers that are of D-A1-D-A2 type and contain benzothiadiazole and 2,5-dibromo-8-dodecanoylbenzo[1,2-b:3,4-b\':5,6-d \'\']trithiophene (P1) or 2,8-dibromo-5-dodecanoylbenzene[1,2-b:3,4-b\':5,6-d6-d \'\']trithiophene (P2) acceptor units with the same thiophene donor were synthesized through Stille coupling, and their optical and electrochemical properties were investigated. The highest occupied molecular orbital (HOMO) and lowest unoccupied (LUMO) molecular orbital energy levels of these terpolymers indicate that there is sufficient LUMO offset with PCBM for efficient exciton dissociation, and their deeper HOMO levels ensure the high open-circuit voltage for the resultant bulk heterojunction solar cells. Measurements on the solar cell devices also confirm that compared to those based on P2 the devices based on P1 possess a higher short-circuit photocurrent (J(sc)) as well as a higher fill factor (FF), which is attributed to the lower bandgap and higher hole mobility for P1, whereas the V-oc is higher for the devices that are based on P2, which may be a result of P2 having a lower HOMO energy level than P1. The optimized polymer solar cells fabricated using P1:PC71BM (DIO/CF) and P2:PC71BM (CF/DIO) for the active layers showed a PCE of 7.19% and 6.34%, respectively. Atomic force microscopy (AFM) images of PEPC71BM blend films show that they exhibit more suitable morphology with favorable interpenetrating networks, which favors high J(sc) and FF. Moreover, P1 exhibits a more crystalline nature than P2 that also favors the charge transport. This may be a result of better molecular packing, more distinct phase separation of the blended films, as well as a reduction of charge recombination.
Metal-Particle-Decorated ZnO Nanocrystals: Photocatalysis and Charge Dynamics
(2016-12-07)
Lin, Wei-Hao
;
Chiu, Yi-Hsuan
;
Shao, Pao-Wen
;
Hsu, Yung-Jung
;
材料科學與工程學系
Understanding of charge transfer processes is determinant to the performance optimization for semiconductor photocatalysts. As a representative model of composite photocatalysts, metal-particle-decorated ZnO has been widely employed for a great deal of photocatalytic applications; however, the dependence of charge carrier dynamics on the metal content and metal composition and their correlation with the photocatalytic properties have seldom been reported. Here, the interfacial charge dynamics for metal-decorated ZnO nanocrystals were investigated and their correspondence with the photocatalytic properties was evaluated. The samples were prepared with a delicate antisolvent approach, in which ZnO nanocrystals were grown along with metal particle decoration in a deep eutectic solvent. By modulating the experimental conditions, the metal content (from 0.6 to 2.3 at%) and metal composition (including Ag, Au, and Pd) in the resulting metal-decorated ZnO could be readily controlled. Time-resolved photoluminescence spectra showed that an optimal Au content of 1.3 at% could effectuate the largest electron transfer rate constant for Au-decorated ZnO nanocrystals, in conformity with the highest photocatalytic efficiency observed. The relevance of charge carrier dynamics to the metal composition was also inspected and realized in terms of the energy level difference between ZnO and metal. Among the three metal-decorated ZnO samples tested, ZnO-Pd displayed the highest photocatalytic activity, fundamentally according with the largest electron transfer rate constant deduced in carrier dynamics measurements. The current work was the first study to present the correlations among charge carrier dynamics, metal content, metal composition, and the resultant photocatalytic properties for semiconductor/metal heterostructures. The findings not only helped to resolve the standing issues regarding the mechanistic foundation of photocatalysis but also shed light on the intelligent design of semiconductor/metal composite systems to consolidate their utility in photocatalytic fields.
Electrohydrodynamic-assisted Assembly of Hierarchically Structured, 3D Crumpled Nanostructures for Efficient Solar Conversions
(2016-12-07)
Ishihara, Hidetaka
;
Chen, Yen-Chang
;
De Marco, Nicholas
;
Lin, Oliver
;
Huang, Chih-Meng
The tantalizing prospect of harnessing the unique properties of graphene crumpled nanostructures continues to fuel tremendous interest in energy storage and harvesting applications. However, the paper ball-like, hard texture, and closed-sphere morphology of current 3D graphitic nanostructure production not only constricts the conductive pathways but also limits the accessible surface area. Here, we report new insights into electrohydrodynamically-generated droplets as colloidal nanoreactors in that the stimuli-responsive nature of reduced graphene oxide can lead to the formation of crumpled nanostructures with a combination of open structures and doubly curved, saddle-shaped edges. In particular, the crumpled nanostructures dynamically adapt to non-spherical, polyhedral shapes under continuous deposition, ultimately assembling into foam-like microstructures with a highly accessible surface area and spatially interconnected transport pathways. The implementation of such crumpled nanostructures as three-dimensional rear contacts for solar conversion applications realize benefits of a high aspect ratio, electrically addressable and energetically favorable interfaces, and substantial enhancement of both short-circuit currents and fill-factors compared to those made of planar graphene counterparts. Further, the 3D crumpled nanostructures may shed lights onto the development of effective electrocatalytic electrodes due to their open structure that simultaneously allows for efficient water flow and hydrogen escape.
A Sliced Inverse Regression (SIR) Decoding the Forelimb Movement from Neuronal Spikes in the Rat Motor Cortex
(2016-12-09)
Yang, Shih-Hung
;
Chen, You-Yin
;
Lin, Sheng-Huang
;
Liao, Lun-De
;
Lu, Henry Horng-Shing
Several neural decoding algorithms have successfully converted brain signals into commands to control a computer cursor and prosthetic devices. A majority of decoding methods, such as population vector algorithms (PVA), optimal linear estimators (OLE), and neural networks (NN), are effective in predicting movement kinematics, including movement direction, speed and trajectory but usually require a large number of neurons to achieve desirable performance. This study proposed a novel decoding algorithm even with signals obtained from a smaller numbers of neurons. We adopted sliced inverse regression (SIR) to predict forelimb movement from single-unit activities recorded in the rat primary motor (M1) cortex in a water-reward lever-pressing task. SIR performed weighted principal component analysis (RCA) to achieve effective dimension reduction for nonlinear regression. To demonstrate the decoding performance, SIR was compared to PVA, OLE, and NN. Furthermore, RCA and sequential feature selection (SFS) which are popular feature selection techniques were implemented for comparison of feature selection effectiveness. Among SIR, PVA, OLE, PCA, SFS, and NN decoding methods, the trajectories predicted by SIR (with a root mean square error, RMSE, of 8.47 +/- 1.32 mm) was closer to the actual trajectories compared with those predicted by PVA (30.41 +/- 11.73 mm), OLE (20.17 +/- 6.43 mm), PCA (19.13 +/- 0.75 mm), SFS (22.75 +/- 2.01 mm), and NN (16.75 +/- 2.02 mm). The superiority of SIR was most obvious when the sample size of neurons was small. We concluded that SIR sorted the input data to obtain the effective transform matrices for movement prediction, making it a robust decoding method for conditions with sparse neuronal information.
雲端商機　谷歌App Maker
(2016-12-11)
何書馨
;
Department of Communication and Technology
;
傳播與科技學系
谷歌宣布推出應用程式開發工具App Maker，此軟體將整合G Suite各式雲端服務，客製化打造符合企業需求的內部軟體。
無線充電　打破傳統限制
(2016-12-11)
何家沂
;
Department of Communication and Technology
;
傳播與科技學系
介紹無線充電技術、應用、和未來發展。
譚光鼎　教育之路一定永定
(2016-12-11)
范晨星
;
Department of Communication and Technology
;
傳播與科技學系
這是一個描述譚光鼎對教育的夢想、理解與熱愛的故事。
總編輯的話
(2016-12-11)
陳昱彣
;
Department of Communication and Technology
;
傳播與科技學系
喀報第255期頭題為「性別霸凌荊棘裡的玫瑰」，探討校園性別議題。另外有多篇醫療健康方面的科技新知，讓讀者能由淺入深認識新科技。
高齡駕駛人　上路行不行
(2016-12-11)
陳奕璇
;
Department of Communication and Technology
;
傳播與科技學系
2017年1月「高齡駕駛人駕駛執照管理制度」將正式實施，故探討新制度之利弊。
研發替代役　安全冒險的路
(2016-12-11)
王廷瑄
;
Department of Communication and Technology
;
傳播與科技學系
透過分析資方與勞方的雙方觀點，探討研替制度的沿革與爭議。
單
(2016-12-11)
張巧宜
;
Department of Communication and Technology
;
傳播與科技學系
以單身心境為主題的古詩創作。
BNCT　肝癌治療曙光
(2016-12-11)
劉以寧
;
Department of Communication and Technology
;
傳播與科技學系
BNCT，硼中子捕獲療法，於清大發展出治療癌症的療法，是醫療新曙光。
蔣月惠　為社會弱勢奮鬥
(2016-12-11)
張博倫
;
Department of Communication and Technology
;
傳播與科技學系
介紹社福團體「羅騰園」的理事長蔣月惠，三十年來投入羅騰園的歷程。
正反論戰　大麻除罪之爭
(2016-12-11)
郭宜婷
;
Department of Communication and Technology
;
傳播與科技學系
今年11月美國三個州公投通過大麻作為娛樂使用，使大麻除罪化這項議題在國際社會引起高度關注。
技術革新　打造智慧感知衣
(2016-12-11)
韓舒容
;
Department of Communication and Technology
;
傳播與科技學系
工研院利用奈妙脈衝及奈米銀線技術，成功研發出可水洗、不必服貼、具有高精確度的「iSmartweaR智慧感知衣」。
新足踝護具　防腳踝慢性病
(2016-12-11)
張芳語
;
Department of Communication and Technology
;
傳播與科技學系
顛覆傳統護具單純防止再次扭傷，新式足踝護具增加防止慢性病、治療腳踝扭傷等功能。
性別霸凌　荊棘裡的玫瑰
(2016-12-11)
林宥成
;
Department of Communication and Technology
;
傳播與科技學系
性霸凌不應被大家忽視，加害者與受害者的心理狀態與外在表現，與其解決之道，都應有管道解決。
鹹鹹海風　戀戀永安
(2016-12-11)
何肇耕
;
Department of Communication and Technology
;
傳播與科技學系
鹹味的海風、伴隨著薩克斯風的音樂，品嘗著的不僅是海產的鮮，同時還有永安的美。
吳孟霖　旅行外的寫作人生
(2016-12-11)
鄭懿君
;
Department of Communication and Technology
;
傳播與科技學系
熱愛旅行、身兼工程師與作家的吳孟霖，創立了瘋城部落，協助熱愛文字的寫手們勇敢追夢。