Browsing by Issue Date, starting with "2015-05-18"

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Synthesis and characterization of two new benzothiadiazole- and fused bithiophene based low band-gap D-A copolymers: Application as donor bulk heterojunction polymer solar cells
(2015-05-18)
Keshtov, M. L.
;
Sharma, G. D.
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Kuklin, S. A.
;
Ostapov, I. E.
;
Godovsky, D. Yu.
Two new narrow bandgap D-A conjugated copolymers P1 and P2 containing different fused thiophene donor unit and same benzothiadiazole acceptor unit were synthesized by Stille cross-coupling polymerization, and characterized by H-1 NMR, elemental analysis and GPC, TGA, DSC. Cyclic voltammetry measurement showed that the HOMO energy level both copolymers is deep lying (-5.10 and -5.35 eV for P1 and P2, respectively) which show that copolymers has good stability in the air and assured a higher open circuit voltage when it photovoltaic application. These copolymer were used as donor along with PC71BM and the BHJ polymer solar cells based on P1:PC71BM and P2:PC71BM processed with chloroform (CF) solvent showed over all PCE of 4.54% and 4.36%, respectively. Additionally, the PCE was improved up to 5.62% and 5.24% for P1:PC71BM and P2:PC71BM active layer processed with DIO (4 v%)/CF solvent. The enhancement in the PCE has been attributed to improved nanoscale morphology and crystalline nature of active layer as well as charge transport in the device with the addition of DIO, due to the higher boiling point of DIO causing slow evaporation rate during the film formation. (C) 2015 Elsevier Ltd. All rights reserved.
450-nm GaN laser diode enables high-speed visible light communication with 9-Gbps QAM-OFDM
(2015-05-18)
Chi, Yu-Chieh
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Hsieh, Dan-Hua
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Tsai, Cheng-Ting
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Chen, Hsiang-Yu
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Kuo, Hao-Chung
A TO-38-can packaged Gallium nitride (GaN) blue laser diode (LD) based free-space visible light communication (VLC) with 64-quadrature amplitude modulation (QAM) and 32-subcarrier orthogonal frequency division multiplexing (OFDM) transmission at 9 Gbps is preliminarily demonstrated over a 5-m free-space link. The 3-dB analog modulation bandwidth of the TO-38-can packaged GaN blue LD biased at 65 mA and controlled at 25 degrees C is only 900 MHz, which can be extended to 1.5 GHz for OFDM encoding after throughput intensity optimization. When delivering the 4-Gbps 16-QAM OFDM data within 1-GHz bandwidth, the error vector magnitude (EVM), signal-to-noise ratio (SNR) and bit-error-rate (BER) of the received data are observed as 8.4%, 22.4 dB and 3.5 x 10(-8), respectively. By increasing the encoded bandwidth to 1.5 GHz, the TO-38-can packaged GaN blue LD enlarges its transmission capacity to 6 Gbps but degrades its transmitted BER to 1.7 x 10(-3). The same transmission capacity of 6 Gbps can also be achieved with a BER of 1 x 10(-6) by encoding 64-QAM OFDM data within 1-GHz bandwidth. Using the 1.5-GHz full bandwidth of the TO-38-can packaged GaN blue LD provides the 64-QAM OFDM transmission up to 9 Gbps, which successfully delivers data with an EVM of 5.1%, an SNR of 22 dB and a BER of 3.6 x 10(-3) passed the forward error correction (FEC) criterion. (C) 2015 Optical Society of America
Polarization modulation for fluorescence emission difference microscopy
(2015-05-18)
Wang, Nan
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Kobayashi, Takayoshi
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先進超快雷射研究中心
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Adv Ultrafast Laser Ctr
Effects of the polarization on subtracted images in fluorescence emission difference microscopy are numerically investigated based on vector beam diffraction theory and alteration of Jones matrices. Parameters of resolution, signal loss, and amplitude of negative sidebands after subtraction are discussed along with the polarization of excitation beams and sample sizes. The effects of polarization on the ellipticity and subtraction threshold are also given. (C) 2015 Optical Society of America
Numerical calibration of the spatial overlap for subtraction microscopy
(2015-05-18)
Wang, Nan
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Kobayashi, Takayoshi
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電機學院
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College of Electrical and Computer Engineering
Recently proposed subtraction microscopy provides a simple and compact approach to enhance the spatial resolution. However, inevitable imperfect overlap of the Gaussian and donut spots could deteriorate the quality of the subtracted images, while this effect is rarely investigated quantitatively. Based on vector diffraction theory, the effects of spatial displacements on the image resolution, signal intensity, and subtraction threshold are studied with several microscope parameters here. The peakposition shift is found to be a useful and convenient parameter to inspect and calibrate the spatial overlap of excitation spots in such microscopes. (C) 2015 Optical Society of America
A Unique Approach to Generate Self-Aligned SiO2/Ge/SiO2/SiGe Gate-Stacking Heterostructures in a Single Fabrication Step
(2015-05-19)
Lai, Wei-Ting
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Yang, Kuo-Ching
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Hsu, Ting-Chia
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Liao, Po-Hsiang
;
George, Thomas
We report a first-of-its-kind, unique approach for generating a self-aligned, gate-stacking heterostructure of Ge quantum dot (QD)/SiO2/SiGe shell on Si in a single fabrication step. The 4-nm-thick SiO2 layer between the Ge QD and SiGe shell fabricated during the single-step process is the result of an exquisitely controlled dynamic balance between the fluxes of oxygen and silicon interstitials. The high-quality interface properties of our "designer" heterostructure are evidenced by the low interface trap density of as low as 2-4 x 10(11) cm(-2) eV(-1) and superior transfer characteristics measured for Ge-based metal-oxide-semiconductor field-effect transistors (MOSFETs). Thanks to the very thin interfacial SiO2 layer, carrier storage within the Ge QDs with good memory endurance was established under relatively low-voltage programming/erasing conditions. We hope that our unique self-aligned, gate-stacking heterostructure provides an effective approach for the production of next-generation, high-performance Ge gate/SiO2/SiGe channel MOSFETs.
交大e-News第186期-足以與世界PK的一流人才梅竹田徑英雄王威翔獲日本理化學研究所延攬
(2015-05-20)
國立交通大學秘書室
;
Secretariat
橢圓偏光儀及運用該橢圓偏光儀之橢圓偏光參數量測方法
(2015-05-21)
趙于飛
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謝美莉
;
韓建遠
1.一種橢圓偏光儀，包含：一偏光單元，包含一照明源及一偏光片，該偏光片位於該照明源之一側，用以將該照明源所提供之光源轉換成偏極光；以及一偵測單元，用以連續量測三組偏極光的亮度值，該偵測單元包含一液晶片、一補波片、一析光片及一檢測器，該三組偏極光係分別由該偏光單元發出且經一待測物反射後，再依序通過該液晶片、該補波片、該析光片而到達該檢測器，以供該檢測器進行量測而取得該三組偏極光的亮度值後，依據該三組偏極光的亮度值以一演算法直接計算出該待測物之橢圓偏光參數；其中，該三組偏極光係分別在該液晶片之彼此相隔60度之不同相位延遲時通過該液晶片。
ELECTRO-OPTICAL LIQUID CRYSTAL DEVICE
(2015-05-21)
LIN Yi-Hsin
;
CHEN Hung-Shan
A liquid crystal (LC) lens comprises a first substrate, a first electrode structure, an electrically tunable LC layer structure, a second substrate and a second electrode structure, wherein the electrically tunable LC layer structure is arranged between the first substrate and the second substrate. The electrically tunable LC layer structure includes at least two LC layers stacked on top of one another, and each LC layer further includes at least one LC unit. In the stacked structure, at least one of the LC layers includes at least one partition unit to partition the LC layer into one or more LC units. The layout of the LC units of the upper LC layer differs from that of the lower LC layer. In the present invention, the shape and layout of the LC units are designed to provide better optical performance without changing the thickness of the liquid crystal lens.
用於擴散式光學斷層掃描之控制感測系統及其運作方法
(2015-05-21)
方偉騏
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陳殿河
;
康適
;
吳世揚
;
鄭敬儒
1.一種用於擴散式光學斷層掃描之控制感測系統，係包括：控制單元，係用以發出控制命令；以及感測電路，係電性連接至該控制單元，該感測電路包括：複數個光源，係用以根據該控制命令，分別對一待測物發射光線，使該待測物與該光線反應而產生複數個光訊號；及複數個偵測器，係用以根據該控制命令，分別接收該複數個光訊號，以將該複數個光訊號傳輸至該控制單元，其中，該複數個偵測器彼此的相對位置、該複數個光源彼此的相對位置、該複數個偵測器與該複數個光源的相對位置係具有預定距離，且該複數個光源的每一者係對應有預定數量個偵測器，其中，該控制單元判斷所接收到的光訊號數量是否達該預定數量；若該控制單元所接收到的光訊號數量尚未達該預定數量時，令對應各該光源的預定數量個偵測器繼續接收該待測物與該光線反應所產生的光訊號，以將之傳輸至該控制單元，直到該控制單元所接收到的光訊號數量達到該預定數量為止；以及令該控制單元判斷該複數個光源的全部是否均已對該待測物發射該光線；若該複數個光源尚未全部對該待測物發射該光線，則令該複數個光源中尚未發射該光線者對該待測物發射該光線，直到令該複數個光源的全部均已對該待測物發射該光線為止。
演化學習遊戲裝置
(2015-05-21)
鄭夢慈
;
林育妏
;
佘曉清
1.一種演化學習遊戲裝置，包括：一顯示器；一儲存器，其係存有二種場景及其對應之複數種代表生物，該場景包含中生代與新生代；以及一運算單元，連接該儲存器與該顯示器，該運算單元係從該些代表生物中，挑選至少二種該代表生物，以分別作為至少一我方生物與至少一非我方生物，並在該顯示器上，顯示該我方生物與該非我方生物在該場景裡之演化與互動狀況，該運算單元於該中生代之過關條件設定為該些非我方生物全部死亡，且始祖鳥與始祖獸必須出現並存活，該運算單元於該新生代之過關條件設定為該些非我方生物全部死亡，且森林古猿與南方古猿必須出現並存活。
Improved optical limiting performance of laser-ablation-generated metal nanoparticles due to silica-microsphere-induced local field enhancement
(2015-05-22)
Du, Zheren
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Chen, Lianwei
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Kao, Tsung-Sheng
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Wu, Mengxue
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Hong, Minghui
For practical application, optical limiting materials must exhibit a fast response and a low threshold in order to be used for the protection of the human eye and electro-optical sensors against intense light. Many nanomaterials have been found to exhibit optical limiting properties. Laser ablation offers the possibility of fabricating nanoparticles from a wide range of target materials. For practical use of these materials, their optical limiting performance, including optical limiting threshold and the ability to efficiently attenuate high intensity light, needs to be improved. In this paper, we fabricate nanoparticles of different metals by laser ablation in liquid. We study the optical nonlinear properties of the laser-generated nanoparticle dispersion. Silica microspheres are used to enhance the optical limiting performance of the nanoparticle dispersion. The change in the optical nonlinear properties of the laser-generated nanoparticle dispersion caused by silica microspheres is studied. It is found that the incident laser beam is locally focused by the microspheres, leading to an increased optical nonlinearity of the nanoparticle dispersion.
教育遊戲化　打GAME也開課
(2015-05-24)
黃馨儀
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Department of Communication and Technology
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傳播與科技學系
多元學習無處不有，但「打電動」也能成為一門課嗎？林日璇開設「電子遊戲與社會」課程，學生好評不斷。
咬一口吐司　享一段人生
(2015-05-24)
鄭青青
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Department of Communication and Technology
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傳播與科技學系
電影【吐司：敬！美味人生】在看似色香味俱全的喜劇情節中，藏著的是一顆受傷的心靈。
共好晚餐　弱勢關懷
(2015-05-24)
林霈楨
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Department of Communication and Technology
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傳播與科技學系
本身也是單親媽媽的羅萱，用自己的手作教室成立「共好食堂」，邀請弱勢家庭的成員前來晚餐，提供心靈支持。
泰雅學堂　賦予原夢的舞台
(2015-05-24)
謝宜寧
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Department of Communication and Technology
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傳播與科技學系
泰雅學堂成立於二○○八年，原住民的孩子們在這裡透過音樂站上夢想的舞台。
衝撞電影視覺　設計愛情
(2015-05-24)
沈祖廷
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Department of Communication and Technology
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傳播與科技學系
剖析風格獨特的導演陳宏一的作品與近期電影【相愛的七種設計】，點出其特殊和創新之處。
安克羅　永該被遺忘的地方
(2015-05-24)
許仲廷
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Department of Communication and Technology
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傳播與科技學系
紀錄片【核你到永遠】帶領觀眾探索深藏在芬蘭古老岩層地底下的「安克羅」核廢料最終貯存場。
母語失傳　客語檢定人數降
(2015-05-24)
余念竹
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Department of Communication and Technology
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傳播與科技學系
近年受到少子化衝擊，客語檢定人數有緩降的趨勢，但還有更多潛在原因。
一點五類組　失落的夢想
(2015-05-24)
洪詩宸
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Department of Communication and Technology
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傳播與科技學系
「成為電腦工程師」是在我心中持續最久也最遺憾的夢想。
總編輯的話
(2015-05-24)
李恬芳
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Department of Communication and Technology
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傳播與科技學系
本期喀報為二一六期，共十九篇稿件，其中有三篇影像新聞、三篇廣播新聞、三篇動畫、兩篇新聞圖表、六篇文字與兩篇照片故事。