Browsing by Issue Date, starting with "2013-05-13"

Now showing 1 - 20 of 31653

Effects of bulk and interfacial charge accumulation on fill factor in organic solar cells
(2013-05-13)
Chen, Bingbing
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Qiao, Xianfeng
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Liu, Chih-Ming
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Zhao, Chen
;
Chen, Hsiu-Cheng
The effects of charge accumulation on fill factor (FF) are studied by using light intensity-dependent current-voltage and capacitance-voltage measurements based on poly-{bi(dodecyl) thiophene-thieno[ 3,4-c]pyrrole-4,6-dione}:1(3-methyloxycarbonyl)propyl-1-phenyl [6,6] (PBTTPD:PCBM) solar cells. We find that the FF of un-annealed device shows a non-monotonic dependence of light intensity: first an increase and then a decrease with increasing light intensity. This suggests that both bulk charge accumulation and recombination determine the FF before thermal annealing. Furthermore, the morphological enhancement of PBTTPD: PCBM film leads to a monotonic decrease of FF as increasing light intensity. This indicates that only surface charge accumulation plays an important role in the determination of the FF after thermal annealing. (C) 2013 AIP Publishing LLC.
Label-Free Electrical Detection of DNA Hybridization on Graphene using Hall Effect Measurements: Revisiting the Sensing Mechanism
(2013-05-13)
Lin, Cheng-Te
;
Phan Thi Kim Loan
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Chen, Tzu-Yin
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Liu, Keng-Ku
;
Chen, Chang-Hsiao
There is broad interest in using graphene or graphene oxide sheets as a transducer for label-free and selective electrical detection of biomolecules such as DNA. However, it is still not well explored how the DNA molecules interact with and influence the properties of graphene during the detection. Here, Hall effect measurements based on the Van der Pauw method are used to perform single-base sequence selective detection of DNA on graphene sheets, which are prepared by chemical vapor deposition. The sheet resistance increases and the mobility decreases with the addition of either complementary or one-base mismatched DNA to the graphene device. The hole carrier concentration of the graphene devices increases significantly with the addition of complementary DNA but it is less affected by the one-base mismatched DNA. It is concluded that the increase in hole carrier density, indicating p-doping to graphene, is better correlated with the DNA hybridization compared to the commonly used parameters such as conductivity change. The different electrical observations of p-doping from Hall effect measurements and n-doping from electrolyte-gated transistors can be explained by the characteristic morphology of partially hybridized DNA on graphene and the mismatch between DNA chain length and Debye length in electrolytes.
High quality factor nonpolar GaN photonic crystal nanocavities
(2013-05-13)
Wu, Tzeng-Tsong
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Lo, Sheng-Yun
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Huang, Huei-Min
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Tsao, Che-Wei
;
Lu, Tien-Chang
High quality factor a-plane nonpolar GaN two-dimensional photonic crystal (PC) nanocavities on r-plane sapphire substrates have been demonstrated. Nonpolar GaN PC nanocavities on a thin membrane structure were realized by using e-beam lithography to define the PC patterns and focused-ion beam milling to fabricate the suspended thin membrane. A dominant resonant mode at 388 nm with a high quality factor of approximately 4300 has been demonstrated at 77K by the micro-photoluminescence system. Moreover, the degree of polarization of the emission from the non-polar GaN PC nanocavity was measured to be 64% along the m crystalline direction. (C) 2013 AIP Publishing LLC.
Decentralized structured peer-to-peer network and load balancing methods thereof
(2013-05-14)
Hsu Chung-Yuan
;
Wang Kuochen
;
Shih Hung-Cheng
An approach is provided for reassigning and sharing loads to peers with a same identity, which is based on a threshold. The peers are configured to store indexes of a key and to share the same loading (i.e., indexes) of the key to the peers with same secondary identities in different zones. The secondary identity is derived and has a modulo relationship with a first identity of the peer. The threshold indicates maximum number of indexes stored in each peer. Therefore, the loading are distributed evenly to peers in different zones, which achieves load balance to a decentralized structured peer-to-peer network.
The effect of dielectric confinement on photoluminescence of In2O3-SiO2 nanocomposite thin films incorporated by nitrogen
(2013-05-14)
Lyu, Yang-Ru
;
Hsieh, Tsung-Eong
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材料科學與工程學系
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Department of Materials Science and Engineering
Nanocomposite thin films containing In2O3 nanoparticles were prepared by the target-attachment sputtering utilizing the InN pellets and allowing the N-2 inlet gas flow during the deposition process. The x-ray photoelectron spectroscopy revealed that the chemical composition of In2O3 nanoparticles becomes InOxNy and the SiOxNy phase forms in the matrix of nanocomposite layer. Photoluminescence analysis indicated that the dielectric confinement effect induced by the N-incorporation tends to restrain the green emission of nanocomposite layers due to the presence of surface polarization on nanoparticles. Suppression of blue emission was also observed due to the elimination of oxygen vacancies in In2O3 nanoparticles. Furthermore, the N elements might occupy the oxygen lattice sites and generate a new defect level, N-O(-), to induce the violet emission. Analytical results confirmed the mechanisms of green and blue emissions of the nanocomposite thin films containing In2O3 nanoparticles reported previously. (C) 2013 AIP Publishing LLC.
Reappraising the relationships between physics students' mental models and predictions: An example of heat convection
(2013-05-14)
Chiou, Guo-Li
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教育研究所
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Institute of Education
Although prediction is claimed to be a prime function of mental models, to what extent students can run their mental models to make predictions of physical phenomena remains uncertain. The purpose of this study, therefore, was first to investigate 30 physics students' mental models of heat convection, and then to examine the relationship between their mental models and predictions of convection-related phenomena. A series of semistructured interviews was conducted to probe the participants' mental models and predictions of heat convection, and the constant comparative method was adopted for data analysis. The results reveal that the participants held a variety of mental models of heat convection, and nearly half held flawed mental models rather than a scientifically compatible one. In addition, while many participants attempted to run their mental models to make a prediction at the beginning stage of solving an interview problem, the relationship between the models and predictions became increasingly complex as the problem solving process continued. The relationships between mental models and predictions, however, could be better understood by considering the completeness of a mental model, the scale of analyzing mental models, and the retrieval of different formats of mental representations.
Dung-shen (Codonopsis pilosula) attenuated the cardiac-impaired insulin-like growth factor II receptor pathway on myocardial cells
(2013-05-15)
Tsai, Kun-Hsi
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Lee, Nien-Hung
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Chen, Guei-Ying
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Hu, Wei-Syun
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Tsai, Chen-Yen
Previous studies from our lab showed that increase in AngIl in H9c2 cells causes elevated IGFII and IGFIIR through MEK and JNK, leading to rise in intracellular calcium, calcineurin activation by PLC-beta 3 via G alpha q, insertion into mitochondrial membranes of Bad, and apoptosis via caspases 9 and 3. Codonopsis pilosula is traditionally used to lower blood pressure. The purpose of our study is to investigate if C. pilosula attenuates AngII plus Leu(27)-IGFII-induced calcium influx and apoptosis in H9c2 cardiomyoblasts. C pilosula significantly attenuated AngII induced IGFIIR promoter activity. Leu(27)-IGFII was applied to enhance the Angll effect. C pilosula also reversed Ca2+ influx, MOMP and apoptosis increased by AngIl plus Leu(27)-IGFIL Molecular markers in IGFIIR apoptotic pathway (IGFIIR, calcineurin, etc.) and IGFIIR-G alpha q association were downregulated by C pilosula. However, p-Bad(Ser136) and BcI-2 were increased. Therefore, C pilosula suppresses Angll plus Leu(27)-IGFII-induced IGFII/IGFIIR pathway in myocardial cells. (C) 2012 Elsevier Ltd. All rights reserved.
rGO/SWCNT composites as novel electrode materials for electrochemical biosensing
(2013-05-15)
Huang, Tzu-Yen
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Huang, Jen-Hsien
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Wei, Hung-Yu
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Ho, Kuo-Chuan
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Chu, Chih-Wei
In this study we performed electrochemical sensing using conductive carbon composite films containing reduced graphene oxide (rGO) and single-walled carbon nanotubes (SWCNTs) as electrode modifiers on glassy carbon electrodes (GCEs). Raman spectroscopy, transmission electron microscopy, atomic force microscopy, and scanning electron microscopy all suggested that the rGO acted as a surfactant, covering and smoothing out the surface, and that the SWCNTs acted as a conducting bridge to connect the isolated rGO sheets, thereby (i) minimizing the barrier for charge transfer between the rGO sheets and (ii) increasing the conductivity of the film. We used the rGO/SWCNT-modified GCE as a sensor to analyze hydrogen peroxide (H2O2) and beta-nicotinamide adenine dinucleotide (NADH), obtaining substantial improvements in electrochemical reactivity and detection limits relative to those obtained from rGO- and SWCNT-modified electrodes, presumably because of the higher conductivity and greater coverage on the GCE, due to pi-pi interactions originating from the graphitic structures of the rGO and SWCNTs. The electrocatalysis response was measured by cyclic voltammetry and amperometric current-time (i-t) curve techniques. The linear concentration range of H2O2 and NADH detection at rGO/SWCNT-modified electrode is 0.5-5 M and 20-400 mu M. The sensitivity for H2O2 and NADH detection is 2732.4 and 204 mu A mM(-1) cm(-2), and the limit of detection is 1.3 and 0.078 mu M respectively. Furthermore, interference tests indicated that the carbon composite film exhibited high selectivity toward H2O2 and NADH. Using GO as a solubilizing agent for SWCNTs establishes a new class of carbon electrodes for electrochemical sensors. (C) 2012 Elsevier B.V. All rights reserved.
Numerical studies on structure-preserving algorithms for surface acoustic wave simulations
(2013-05-15)
Huang, Tsung-Ming
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Li, Tiexiang
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Lin, Wen-Wei
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Wu, Chin-Tien
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應用數學系
We study the generalized eigenvalue problems (GEPs) derived from modeling the surface acoustic wave in piezoelectric materials with periodic inhomogeneity. The eigenvalues appear in the reciprocal pairs due to periodic boundary conditions in the modeling. By transforming the GEP into a T-palindromic quadratic eigenvalue problem (TPQEP), the reciprocal relationship of the eigenvalues can be maintained. In this paper, we outline four recently developed structure-preserving algorithms, SA, SDA, TSHIRA and GTSHIRA, for solving the TPQEP. Numerical comparisons on the accuracy and the computational costs of these algorithm are presented. The eigenvalues close to unit circle on the complex plane are of interest in the area of filter and sensor designs. Our numerical results show that the Arnoldi-type structure-preserving algorithms TSHIRA and GTSHIRA with "re-symplectic" and "re-bi-isotropic" processes, respectively, are as accurate as the SA and SDA algorithms, and more efficient in finding these eigenvalues. (c) 2012 Elsevier B.V. All rights reserved.
多位元電阻切換記憶體元件與陣列
(2013-05-16)
侯拓宏
;
吳仕傑
本發明提供一種多位元電阻切換記憶體元件及陣列。每一記憶體元件可形成多個導通路徑,導通路徑彼此獨立,且任一導通路徑之電阻可為高電阻狀態或低電阻狀態,而形成多位元電阻切換記憶體元件。利用多位元電阻切換記憶體元件排列而成之陣列,可提供結構簡單、高密度、高效能以及低成本的記憶體裝置。
減少硫化氫之生物性複合物及方法
(2013-05-16)
曾慶平
;
陳煜沛
本發明係有關於一種減少硫化氫之生物性複合物及方法，其中該減少硫化氫之生物性複合物包括：一擔體；以及一棲熱菌屬菌株（Thermus sp.），固著於該擔體上。因此，利用該棲熱菌屬菌株或固著有該棲熱菌屬菌株之擔體與含硫化氫之樣本接觸，便可以減少其中之硫化氫含量。
適用於第三代夥伴計劃長期技術演進通訊系統之時脈同步及細胞搜索方法
(2013-05-16)
桑梓賢
;
蔡耀賢
本發明主要在提出一種較佳之時間同步方法和初始細胞搜索流程,應用於以正交分頻多重存取(OFDMA)技術為基礎的無線通訊系統,例如應用於3GPP長期技術演進標準。本發明之初始細胞搜索流程主要分成四個步驟,第一步驟必須將接收端所接收到的訊號,經過低通濾波器將同步訊號以外的訊號濾掉;第二步驟執行時間同步,利用第二同步訊號的對稱性,對載波頻域偏差具有較不敏感的特性,可以提高時間同步的準確性,找出第二同步訊號,而非如一般去搜尋主同步訊號的起始點;第三步驟利用找到的第二同步訊號的起始點,經過結合循環字首盲檢測與主同步訊號偵測得到主同步訊號的位置和細胞第二編號( ),並解決載波頻率偏移問題,第四步驟則是利用所得到的細胞第二編號進行第二同步訊號的偵測,得到細胞第一編號( ),藉由結合第一編號與第二編號,可以得到完整的細胞編號,細胞搜索也就此完成。
PHARMACEUTICAL COMPOSITION CAPABLE OF IMMUNO-REGULATION OR ENHANCEMENT OF IMMUNE RESPONSE
(2013-05-16)
LIAO Kuang-Wen
;
Chen Chia-Hung
A pharmaceutical composition of immuno-regulation or enhancement of immune response is disclosed, which includes a liposome and an immuno-regulating molecule or an antigenic molecule. The liposome, the immuno-regulating molecule or the antigenic molecule needs no genetic or chemical modification. The immuno-regulating molecule or the antigenic molecule is spontaneously adsorbed by the liposome. Thus, the formed pharmaceutical composition can be used for immuno-regulation or enhancement of immune responses.
LOCATION-BASED SERVICE SYSTEM AND SERVING METHOD
(2013-05-16)
Chen Yu-Jia
;
Wang Li-Chun
A location-based service system and method, which allows a location-based service server connected with a communication device and a cloud data server to perform registration authorization procedures and service authorization procedures using an international mobile subscriber identity of the communication device that cannot be easily modified or forged in the registration and service modes, so that a user may obtain a specific location-based service result via the communication device, and this distributed authentication technique reduces the risk of data theft while increasing the flexibility and convenience in obtaining services.
Electrodeposited Nano-Twins Copper Layer and Method of Fabricating the Same
(2013-05-16)
CHEN Chih
;
TU King-Ning
;
LIU Taochi
An electrodeposited nano-twins copper layer, a method of fabricating the same, and a substrate comprising the same are disclosed. According to the present invention, at least 50% in volume of the electrodeposited nano-twins copper layer comprises plural grains adjacent to each other, wherein the said grains are made of stacked twins, the angle of the stacking directions of the nano-twins between one grain and the neighboring grain is between 0 to 20 degrees. The electrodeposited nano-twins copper layer of the present invention is highly reliable with excellent electro-migration resistance, hardness, and Young's modulus. Its manufacturing method is also fully compatible to semiconductor process.
循環碼解碼器及其方法
(2013-05-16)
林義閔
;
許智翔
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張錫嘉
;
李鎮宜
一種循環碼解碼器包含:一可靠度處理器,為接收字碼的q個不可靠符元設定2q組候選値;一徵兆計算器,為接收字碼計算相關於其中一組候選値的2t個徵兆値,其中t為接收字碼的錯誤更正能力;一關鍵方程式運算器,根據徵兆値產生一錯誤位置多項式;及一錯誤更正器。當判斷出多項式階數大於一門檻,徵兆計算器會更新該2t個徵兆値使相關於另一組候選値,且關鍵方程式運算器會以更新後的徵兆値調整多項式;直到調整出的多項式階數不大於門檻,錯誤更正器會基於最後調整出之多項式根値來更正接收字碼。此外,一種循環碼解碼方法也被揭露。
具有免疫調控能力或增強免疫反應之醫藥組成物
(2013-05-16)
廖光文
;
陳家弘
本發明係有關於一種具有免疫調控能力或增強免疫反應之醫藥組成物，其係包含一微脂體以及一免疫調控性分子或一抗原性分子，其中無需經過基因性或化學性修飾，只要讓免疫調控性分子或抗原性分子自然吸附於該微脂體，所得的醫藥組成物即可具有免疫調控能力或增強的免疫反應。
MULTI-BIT RESISTIVE-SWITCHING MEMORY CELL AND ARRAY
(2013-05-16)
HOU TUO-HUNG
;
WU SHIH-CHIEH
This invention proposes a multi-bit resistive-switching memory cell and array thereof. Multiple conduction paths are formed on each memory cell and independent of each other, and each conduction path can be in a high-resistance or low-resistance state, so as to form a multi-bit resistive-switching memory cell. A memory cell array can be formed by arranging a plurality of multi-bit resistive-switching memory cells, and the memory cell array provides a simple, high density, high performance and cost-efficient proposal.
Super-high density Si quantum dot thin film utilizing a gradient Si-rich oxide multilayer structure
(2013-05-17)
Kuo, Kuang-Yang
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Huang, Pin-Ruei
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Lee, Po-Tsung
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光電工程學系
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Department of Photonics
A gradient Si-rich oxide multilayer (GSRO-ML) deposition structure is proposed to achieve super-high density Si quantum dot (QD) thin film formation while preserving QD size controllability for better photovoltaic properties. Our results indicate that the Si QD thin film using a GSRO-ML structure can efficiently increase the QD density and control the QD size. Its optical properties clearly promise the capability of effective bandgap engineering even though these QDs are closely formed. The Si QD thin film using a GSRO-ML structure obviously reveals better electro-optical properties than those using a [silicon dioxide/silicon-rich oxide] multilayer ([SiO2/SRO]-ML) structure owing to the better optical absorption and carrier transport properties. Therefore, we successfully demonstrate that our proposed GSRO-ML structure has great potential for application in solar cells integrating Si QD thin films.
綠建材　環境健康兩雙贏
(2013-05-19)
龔霈鏵
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Department of Communication and Technology
;
傳播與科技學系
建材最初的目標是致力於「人本健康，地球永續」的理念，因此綠建材的使用不只是對於地球環境所帶來的效益，更能保障民眾在「住」方面的健康。