Browsing by Issue Date, starting with "2013-08-14"

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Sharp variation in coercivity and magnetic interactions in patterned CoxNi1-x nanoarrays
(2013-08-14)
Yang, Chao-Yao
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Wang, Liang-Wei
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Chen, Po-An
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Lin, Hong-Ji
;
Lai, Chih-Huang
We present a study concerning the unexpectedly large coercivity increase and associated magneto-structural properties of CoxNi1-x patterned arrays. An increase in x led to an face-center-cubic (FCC)-> hexagonal-close-packed (HCP) transition in CoxNi1-x arrays, accompanied by a 6-fold increase in coercivity and strong 3d exchange interactions probed by x-ray magnetic circular dichroism. Sum-rule analysis revealed that orbital moment involved very little in the variable coercivity and magnetic anisotropy; this is distinct from other nanostructures displaying variable coercivity. The sharp rise in coercivity can be attributed to the geometrical confinement of the arrays, causing the microstructure of the nano-clusters to switch magnetization reversal mechanism from fanning to coherent with increasing x, based on the chain-of-spheres model. First-order-reversal curves revealed that the FCC and HCP arrays comprised both soft and hard ferromagnetic components; however, the soft component of the FCC was much more pronounced, leading to differences in reversibility. This type of nanostructure provides a sharp control of magnetic hardness that could be tailored in related technologies. (C) 2013 AIP Publishing LLC.
Efficiency Enhancement of PEDOT:PSS/Si Hybrid Solar Cells by Using Nanostructured Radial Junction and Antireflective Surface
(2013-08-14)
Chen, Jheng-Yuan
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Con, Celal
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Yu, Ming-Hung
;
Cui, Bo
;
Sun, Kien Wen
We demonstrate the implementation of a hybrid solar cell that comprises a surface nanostructured n-type Si and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate). The Si surface before deposition of the organic layer was nanostructured by using CsCl self-assembled nanoparticles as a hard mask and dry etching to form radial junction architectures and enhance light diffusion and absorption. Apart from the textured Si surface, processing parameters such as from metal-electrode shadow ratio, spin-coating rate, and surfactant addition were properly adjusted to improve overall cell performance. Our hybrid solar cells achieve the best performance under optimized cell parameters with a power conversion efficiency of 8.84% and short-circuit current density of 30.5 mA/cm(2). This combined technique provides a simple, scalable, and cost-effective process for fabricating hybrid solar cells.
Synthesis of Apolipoprotein B Lipoparticles to Deliver Hydrophobic/Amphiphilic Materials
(2013-08-14)
Chu, Hsueh-Liang
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Cheng, Tsai-Mu
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Chen, Hung-Wei
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Chou, Fu-Hsuan
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Chang, Yu-Chuan
To develop a drug delivery system (DDS), it is critical to address challenging tasks such as the delivery of hydrophobic and amphiphilic compounds, cell uptake, and the metabolic fate of the drug delivery carrier. Low-density lipoprotein (LDL) has been acknowledged as the human serum transporter of natively abundant lipoparticles such as cholesterol, triacylglycerides, and lipids. Apolipoprotein B (apo B) is the only protein contained in LDL, and possesses a binding moiety for the LDL receptor that can be internalized and degraded naturally by the cell. Therefore, synthetic/reconstituting apoB lipoparticle (rABL) could be an excellent delivery carrier for hydrophobic or amphiphilic materials. Here, we synthesized rABL in vitro, using full-length apoB through a five-step solvent exchange method, and addressed its potential as a DDS. Our rABL exhibited good biocompatibility when evaluated with cytotoxicity and cell metabolic response assays, and was stable during storage in phosphate-buffered saline at 4 degrees C for several months. Furthermore, hydrophobic superparamagnetic iron oxide nanoparticles (SPIONPs) and the anticancer drug M4N (tetra-O-methyl nordihydroguaiaretic acid), used as an imaging enhancer and lipophilic drug model, respectively, were incorporated into the rABL, leading to the formation of SPIONPs- and M4N- containing rABL (SPIO@rABL and M4N@rABL, respectively). Fourier transform infrared spectroscopy suggested that rABL has a similar composition to that of LDL, and successfully incorporated SPIONPs or M4N. SPIO@rABL presented significant hepatic contrast enhancement in T-2-weighted magnetic resonance imaging in BALB/c mice, suggesting its potential application as a medical imaging contrast agent. M4N@rABL could reduce the viability of the cancer cell line A549. Interestingly, we developed solution-phase high-resolution transmission electron microscopy to observe both LDL and SPIO@rABL in the liquid state. In summary, our LDL-based DDS, rABL, has significant potential as a novel DDS for hydrophobic and amphiphilic materials, with good cell internalization properties and metabolicity.
Investigations on Diamond Nanostructuring of Different Morphologies by the Reactive-Ion Etching Process and Their Potential Applications
(2013-08-14)
Kunuku, Srinivasu
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Sankaran, Kamatchi Jothiramalingam
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Tsai, Cheng-Yen
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Chang, Wen-Hao
;
Tai, Nyan-Hwa
We report the systematic studies on the fabrication of aligned, uniform, and highly dense diamond nanostructures from diamond films of various granular structures. Self-assembled Au nanodots are used as a mask in the self-biased reactive-ion etching (RIE) process, using an O-2/CF4 process plasma. The morphology of diamond nanostructures is a close function of the initial phase composition of diamond. Cone-shaped and tip-shaped diamond nanostructures result for microcrystalline diamond (MCD) and nanocrystalline diamond (NCD) films, whereas pillarlike and grasslike diamond nanostructures are obtained for Ar-plasma-based and N-2-plasma-based ultrananocrystalline diamond (UNCD) films, respectively. While the nitrogen-incorporated UNCD (N-UNCD) nanograss shows the most-superior electron-field-emission properties, the NCD nanotips exhibit the best photoluminescence properties, viz, different applications need different morphology of diamond nanostructures to optimize the respective characteristics. The optimum diamond nanostructure can be achieved by proper choice of granular structure of the initial diamond film. The etching mechanism is explained by in situ observation of optical emission spectrum of RIE plasma. The preferential etching of sp(2)-bonded carbon contained in the diamond films is the prime factor, which forms the unique diamond nanostructures from each type of diamond films. However, the excited oxygen atoms (O*) are the main etching species of diamond film.
Solving large-scale nonlinear matrix equations by doubling
(2013-08-15)
Weng, Peter Chang-Yi
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Chu, Eric King-Wah
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Kuo, Yueh-Cheng
;
Lin, Wen-Wei
;
應用數學系
We consider the solution of the large-scale nonlinear matrix equation X + BX-1 A - Q = 0, with A, B, Q, X is an element of C-nxn, and in some applications B = A(star) (star = T or H). The matrix Q is assumed to be nonsingular and sparse with its structure allowing the solution of the corresponding linear system Qv = r in O(n) computational complexity. Furthermore, B and A are respectively of ranks ra, rb << n. The type 2 structure-preserving doubling algorithm by Lin and Xu (2006) [241 is adapted, with the appropriate applications of the Sherman-Morrison-Woodbury formula and the lowrank updates of various iterates. Two resulting large-scale doubling algorithms have an O((r(a) + r(b))(3)) computational complexity per iteration, after some pre-processing of data in O(n) computational complexity and memory requirement, and converge quadratically. These are illustrated by the numerical examples. (C) 2012 Elsevier Inc. All rights reserved.
Effect of Roaming Transition States upon Product Branching in the Thermal Decomposition of CH3NO2
(2013-08-15)
Zhu, R. S.
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Raghunath, P.
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Lin, M. C.
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應用化學系分子科學碩博班
;
Institute of Molecular science
The kinetics for the thermal unimolecular decomposition of CH3NO2 and its structural isomer CH3ONO have been investigated by statistical theory calculations based on the potential energy surface calculated at the UCCSD(T)/CBS and CASPT3(8, 8)/6-311+G(3df,2p) levels. Our results show that for the decomposition of CH3NO2 at pressures less than 2 Torr, isomerization to CH3ONO via the recently located roaming transition state is dominant in the entire temperature range studied, 400-3000 K. However, at higher pressures, the formation of the commonly assumed products, CH3 + NO2, becomes competitive and at pressures higher than 200 Torr the production of CH3 + NO2 is exclusive. The predicted rate constants for 760 Torr and the high-pressure limit with Ar as diluent in the temperature range 500-3000 K, producing solely CH3 + NO2, can be expressed respectively by k(d)(760)(CH3NO2) = 2.94 x 10(55)T(-12.6) exp(-35500/T) s(-1) and k(d)(infinity)(CH3NO2) = 5.88 x 10(24)T(-235) exp(-31400/T) s(-1). In the low pressure limit, the decomposition reaction takes place exclusively via the roaming TS producing internally excited CH3ONO, giving rise to both CH3O + NO and CH2O + HNO with the second-order rate constant k(d)(0)(CH3NO2) = 1.17 x 10(31)T(-10.94) exp(-32400/T) cm(3) molecule(-1) s(-1). For CH3ONO decomposition, a new roaming transition state connecting to the CH2O + HNO products has been located, lying 6.8 kcal/mol below the well-known four-member ring tight transition state and 0.7 kcal/mol below CH3O + NO. The rate constants predicted by similar calculations give rise to the following expressions for the thermal decomposition of CH3ONO in He: k(d)(760)(CH3ONO) = 8.75 X 10(41)T(-8.97) exp(-22600/T) s(-1) and k(d)(infinity)(CH3ONO) = 1.58 x 10(23)T(-2.18) exp(-21100/T) s(-1) in the temperature range 300-3000 K. These results are in very good agreement with available experimental data obtained under practical pressure conditions. The much different branching ratios for the formation of CH3O + NO and CH2O + HNO in the decomposition of both CH3NO2 and CH3ONO are also given in this work.
Photonic crystal nanofishbone nanocavity
(2013-08-15)
Lu, Tsan-Wen
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Lee, Po-Tsung
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光電工程學系
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Department of Photonics
We propose a photonic crystal (PhC) nanofishbone (NFB) nanocavity, which confines an ultrahigh Q (similar to 1.8 x 10(7)) transverse-magnetic (TM) mode. With thin slab thickness and only few PhC periods, the TM mode in NFB nanocavity shows higher Q, larger confinement factor and smaller mode volume than that in PhC nanobeam nanocavity, while the total etched-surface area is also significantly reduced. This PhC NFB nanocavity with very compact device size will be very beneficial for quantum cascade lasers, plasmonic nanolasers, and other applications needing high Q TM modes. (C) 2013 Optical Society of America
Generation of sub-20-fs deep-ultraviolet pulses by using chirped-pulse four-wave mixing in CaF2 plate
(2013-08-15)
He, Jinping
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Kobayashi, Takayoshi
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電子物理學系
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Department of Electrophysics
Sub-20-fs deep ultraviolet (DUV) pulses are generated by using nondegenerate, chirped-pulse four-wave mixing of the fundamental and second-harmonic pulses from a commercial Ti:sapphire amplifier in a CaF2 plate. The energy of the DUV pulses is 3.8 mu J, with a conversion efficiency from total pump energy to DUV of similar to 3.8%. The DUV pulse is compressed using a pre-chirp, introduced via a fused silica window in the fundamental beam. The central wavelength of the DUV spectrum can be tuned from 257 to 277 nm by adjusting the cross angle between the two pump beams. The spectrum can reach a width of 16.8 nm, which can support a pulse duration of 8.7 fs. (C) 2013 Optical Society of America
PHARMACEUTICAL CARRIER AND PHARMACEUTICAL COMPOSITION FOR INHIBITING ANGIOGENESIS
(2013-08-15)
LIAO Kuang-Wen
;
HO Shu-Yi
A pharmaceutical carrier and a pharmaceutical composition for inhibiting angiogenesis are disclosed. The pharmaceutical carrier of the present invention comprises: a drug carrier; and a polypeptide linked to a surface of the drug carrier, wherein the polypeptide comprises a receptor binding domain of vascular endothelial growth factor.
An Energy and Cost Efficient WDM/OFDMA PON System: Design and Demonstration
(2013-08-15)
Yuang, Maria C.
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Hsu, Dar-Zu
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Tien, Po-Lung
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Chen, Hsing-Yu
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Wei, Chia-Chien
In this paper, we propose an energy and cost efficient WDM/OFDMA PON system, referred to as NEWOPS. Based on a new two-tiered semi-tree architecture, NEWOPS allows a large number of ONUs to be connected to OLT using only a handful of colorless transceivers. Due to the architecture, NEWOPS not only facilitates high spectral efficiency and flexible sub-channel bandwidth allocation, but also reduces the Rayleigh backscattering (RB) problem and achieves high energy and cost efficiency. Experimental results demonstrate that, taking only 5-GHz bandwidth for each wavelength, NEWOPS successfully achieves 20-Gb/s downstream and 10-Gb/s upstream OFDM-xQAM transmissions via the same fiber trunk. We depict that, to support 40 ONUs for example, NEWOPS achieves energy efficiency that is three to six times higher than that of a typical 10-Gb/s WDM/OFDM PON.
身體姿態檢測方法及身體姿態檢測系統
(2013-08-16)
蕭子健
;
林冠威
本發明係關於一種可運算出待測者之身體姿態穩定度判斷結果的身體姿態穩定度檢測方法、一種可運算出待測者之肌肉使用狀態判斷結果的肌肉使用狀態檢測方法以及一種應用此肌肉使用狀態檢測方法的肌肉使用狀態檢測系統。本發明之身體姿態穩定度檢測方法係應用一經驗模態分析程序，由待測者之壓力中心位置的時變訊號得出複數個正頻率內在模態函數及複數個負頻率內在模態函數，以形成複數個壓力中心複數平面時變圖。接著，依據這些壓力中心複數平面時變圖所具有的半徑特徵值與相對應之複數個半徑特徵值範圍的比較結果，輸出一穩定度判斷結果。
演化學習遊戲裝置
(2013-08-16)
鄭夢慈
;
林育妏
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佘曉清
本發明係揭露一種演化學習遊戲裝置，包含一顯示器與一儲存器，儲存器係存有至少一種場景及其對應之複數種代表生物。儲存器與顯示器連接一運算單元，其係從代表生物中，挑選至少二種代表生物，以分別作為至少一我方生物與至少一非我方生物，並在顯示器上，顯示我方生物與非我方生物在場景裡之演化與互動狀況。本發明之遊戲可提供明確規則、立即回饋並具有競爭性，互動性較一般教學或動畫教學高，以有效提高使用者的學習興趣與學習成效，寓教育於娛樂與生活當中。
A N-(2-Aminophenyl)-5-(dimethylamino)-1-naphthalenesulfonic Amide (Ds-DAB) Based Fluorescent Chemosensor for Peroxynitrite
(2013-08-16)
Lin, Ku-Kuei
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Wu, Shou-Cheng
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Hsu, Kuang-Mei
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Hung, Chen-Hsiung
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Liaw, Wen-Feng
A dansyl derivative (Ds-DAB) was prepared and used as a fluorescent probe for peroxynitrite (ONOO-) detection. The results showed that the addition of peroxynitrite to the aqueous solution of Ds-DAB would result in obvious fluorescence enhancement. This probe is highly specific for peroxynitrite in aqueous solution, avoiding interference from other reactive oxygen species (ROS) and nitrogen species (RNS). The advantages of high selectivity, fast reaction rate, and peroxynitrite bioimaging render Ds-DAB suitable for peroxynitrite detection.
考慮耗時與耗電的卸載運算量的決策方法與運算系統
(2013-08-16)
林盈達
;
黃霆鈞
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賴源正
;
朱宗賢
一種考慮耗時與耗電的卸載運算量的決策方法。此方法包括：取得運算任務；從影響因子表中取得多個靜態影響因子；蒐集多個動態影響因子。此方法還包括：根據動態影響因子與靜態影響因子，產生各個運算單元與伺服器執行運算任務所需的耗電量與運算時間；根據耗電量與運算時間來計算出執行運算任務的成本數值；根據成本數值，判斷由一目標單元來執行運算任務，此目標單元是一運算單元或一伺服器；由目標單元執行運算任務。藉此，可同時考慮耗電與運算時間，適當地將運算量分配至運算單元與伺服器的其中之一。
單端靜態隨機存取記憶體
(2013-08-16)
周世傑
;
林志宇
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莊景德
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杜明賢
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邱奕瑋
一種單端靜態隨機存取記憶體，包括至少一記憶胞以及第三開關。記憶胞包括資料拴鎖單元、第一開關、第二開關以及資料傳輸單元。資料拴鎖單元拴鎖所接收的輸入資料，並提供儲存資料及此儲存資料的反向資料。第一開關依據第一字元線信號使參考資料傳送至資料拴鎖單元。第二開關依據第二字元線信號使參考資料傳送至資料拴鎖單元。資料傳輸單元依據儲存資料以及控制信號以決定是否傳送參考資料至位元線。第三開關接收參考資料以及控制信號，依據控制信號以傳送參考資料至第一及第二開關以及資料傳輸單元。
抑制血管新生之醫藥載體及醫藥組成物
(2013-08-16)
廖光文
;
何姝怡
本發明係有關於一種抑制血管新生之醫藥載體及醫藥組成物，其中抑制血管新生之醫藥載體係包括：一藥物載體；以及一多肽，連接於藥物載體表面，多肽包括血管內皮生長因子之受器結合區塊。
Odor identification and cognitive function in the Beaver Dam Offspring Study
(2013-08-19)
Schubert, Carla R.
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Cruickshanks, Karen J.
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Fischer, Mary E.
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Huang, Guan-Hua
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Klein, Ronald
Olfactory impairment is associated with cognitive impairment in older adults but less is known about the association of olfactory impairment and cognitive function in middle-aged adults. The association between olfactory impairment and cognitive function tests of attention, processing speed, and executive and psychomotor function was explored in 2837 participants (21-84 years; mean age 49 years) in the Beaver Dam Offspring Study. Among middle-aged participants (aged 35-64 years), those with impairment on an odor identification test took significantly longer to complete the Trail Making Test (TMT-A and TMT-B) and the Grooved Peg Board (GPB) test, than those without olfactory impairment in regression models adjusted for multiple factors. Similar results were found for the TMT-A and TMT-B, but not the GPB, in the whole cohort. Olfactory impairment was associated with poorer performance on cognitive function tests in a primarily middle-aged cohort.
Electrical conduction mechanism of Zn:SiOx resistance random access memory with supercritical CO2 fluid process
(2013-08-19)
Chang, Kuan-Chang
;
Tsai, Tsung-Ming
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Zhang, Rui
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Chang, Ting-Chang
;
Chen, Kai-Huang
In this study, the electrical conduction mechanism of Zn:SiOx resistance random access memory (RRAM) treated with supercritical CO2 fluid (SCCO2) process was investigated by low temperature measurement. The current of low resistance state for current-voltage curves in SCCO2-treated and untreated Zn:SiOx RRAM were measured and compared under a low temperature range from 100K to 298 K. The electrical conduction mechanisms of hopping conduction and metal-like behaviors in SCCO2-treated and untreated Zn:SiOx RRAM were discussed, respectively. Finally, the electrical conduction mechanism was analyzed and verified by the chemical composition and bonding intensity of XPS analyses. (C) 2013 AIP Publishing LLC.
Recurrence relations of higher spin BPST vertex operators for open strings
(2013-08-19)
Fu, Chih-Hao
;
Lee, Jen-Chi
;
Tan, Chung-I
;
Yang, Yi
;
電子物理學系
We calculate higher-spin Brower-Polchinski-Strassler-Tan (BPST) vertex operators for an open bosonic string and express these operators in terms of a Kummer function of the second kind. We derive an infinite number of recurrence relations among BPST vertex operators of different string states. These recurrence relations among BPST vertex operators lead to the recurrence relations among Regge string scattering amplitudes discovered recently.
Real-Time and Label-Free Detection of the Prostate-Specific Antigen in Human Serum by a Polycrystalline Silicon Nanowire Field-Effect Transistor Biosensor
(2013-08-20)
Huang, Yu-Wen
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Wu, Chung-Shu
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Chuang, Cheng-Keng
;
Pang, See-Tong
;
Pan, Tung-Ming
In this research, we used a polycrystalline silicon nanowire field-effect transistor (poly-Si NWFET) as a biosensor that employs the sidewall spacer technique instead of an expensive electron beam lithography method. When compared with commercial semiconductor processes, the sidewall spacer technique has the advantages of simplicity and low cost. hi this study, we employed a novel poly-Si NWFET device for real-time, label-free, and ultrahigh-sensitivity detection of prostate-specific antigen (PSA) in human serum. Since serum proteome is very complex containing high levels of salts and other interfering compounds, we hereby developed a standard operating procedure for real-sample pretreatment to keep a proper pH value and ionic strength of the desalted serum and also utilized Tween 20 to serve as the passivation agent by surface modification on the NWFET to reduce nonspecific binding for medical diagnostic applications. We first modified 3-aminopropyltriethoxysilane on the surface of a poly-Si nanowire device followed by glutaraldehyde functionalization, and the PSA antibodies were immobilized on the aldehyde terminal. While PSA was prepared in the buffers to maintain an appropriate pH value and ionic strength, the results indicated that the sensor could detect trace PSA at less than 5 fg/mL in a microfluidic channel. The novel poly-Si NWFET is developed as a diagnostic platform for monitoring prostate cancer and predicting the risk of early biochemical relapse.