Browsing by Issue Date, starting with "2015-09-03"

Now showing 1 - 20 of 21054

Locating System for Locking Hole of Intramedullary Nail
(2015-09-03)
Lee Meng-Shiue
;
Wu Sung-Yueh
;
Hsu Wensyang
;
Wong Tze-Hong
;
Chung Tien-Kan Chung
The present invention discloses a two-stage locating device and the method thereof. In stage-one, the preliminary locating device finds the approximate area of the locking hole encircled with the magnetic material on the intramedullary nail. In stage-two, the pinpoint device has a plurality of targeting devices and includes a transparent plate with a plurality of alignment lines. According to the deviations between each pointing device and the alignment lines, the direction of the pinpoint device for further adjustment can be determined. The present invention can determine the position and the orientation of the locking hole on the intramedullary nail quickly and precisely to shorten the time spent to implant the intramedullary nail. Furthermore, the present invention can also have a conductive circuit to connect to an alarm device. Thus, the precise location can be determined through the different alarm signals based on the contact conditions between each directing devices and the conductive circuit.
Effect of cell integrity on algal destabilization by oxidation-assisted coagulation
(2015-09-04)
Lin, Jr-Lin
;
Huang, Chihpin
;
Wang, W. M.
;
環境工程研究所
;
Institute of Environmental Engineering
A hybrid oxidation-coagulation process is commonly adopted to destabilize algae and subsequently improve the removal of algae from water through sedimentation and filtration in water treatment plants (WTPs). Preoxidation is crucial to improving algae removal by a coagulation-sedimentation process. The goal of this study was to investigate the effect of oxidation with NaOCl and ClO2 on the cell integrity of algae (i.e. diatoms) and the destabilization of algae by means of Alum coagulation. The effects of oxidation-assisted coagulation on the performance of sedimentation as well as filtration were evaluated. The results show that ClO2 reduces cell integrity more severely than NaOCl during oxidation. The degradation of chlorophyll a and humic-like substances generated by cells ruptured by ClO2 oxidation is stronger than that by NaOCl oxidation. During oxidation both NaOCl and ClO2 fail to cause significant cell lysis, while cell settleability can be improved markedly by using only ClO2. Preoxidation with ClO2 is more effective in destabilizing the particles and algae when applying Alum coagulation at low dosages. It was found that the residual algae counts in the supernatants are inversely well-correlated to its filterability instead of its residual turbidity. The reduced cell integrity resulting from ClO2 preoxidation effectively improves the performance of coagulation-sedimentation for algae (diatoms) removal and reduces the burden of filtration operation in the WTPs. (C) 2015 Elsevier B.V. All rights reserved.
Matrix metalloproteinase 2 level in human follicular fluid is a reliable marker of human oocyte maturation in in vitro fertilization and intracytoplasmic sperm injection cycles
(2015-09-04)
Yang, Wen-Jui
;
Liu, Fon-Chang
;
Hsieh, Jih-Sheng
;
Chen, Ching-Hung
;
Hsiao, Shun-Yu
Background: To determine whether matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMP-1 and TIMP-2) in human follicular fluid, have any relationships with oocyte maturation in vivo and subsequent fertilization during in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) cycles. Methods: The follicular fluids were obtained from 150 female patients undergoing IVF/ICSI cycles and a total of 1504 oocytes were retrieved for analysis. MMP-2 and MMP-9 activities were measured using zymography assay. TIMP-1 and TIMP-2 concentrations were quantitatively assessed using enzyme-linked immunosorbent assay (ELISA). Results: Human follicular fluid MMP-2 level was significantly associated with the rate of maturity of oocytes (P < 0.001). Furthermore, the MMP-2 was significantly associated with the higher fertilization rate (P < 0.01). There was no significant correlation between follicular MMP-9 and the maturation rate of oocytes. The TIMP-1 and TIMP-2 also showed no correlation with the oocyte maturation rate. Conclusions: The level of gelatinase MMP-2 in human follicular fluid might be a reliable marker of mature oocytes during IVF/ICSI cycles. Furthermore, the MMP-2 expression has a strong association with higher fertilization rate. Further studies are needed to support this theory.
Laminar shear flow increases hydrogen sulfide and activates a nitric oxide producing signaling cascade in endothelial cells
(2015-09-04)
Huang, Bin
;
Chen, Chang-Ting
;
Chen, Chi-Shia
;
Wang, Yun-Ming
;
Hsieh, Hsyue-Jen
Laminar shear flow triggers a signaling cascade that maintains the integrity of endothelial cells (ECs). Hydrogen sulfide (H2S), a new gasotransmitter is regarded as an upstream regulator of nitric oxide (NO). Whether the H2S-generating enzymes are correlated to the enzymes involved in NO production under shear flow conditions remains unclear as yet. In the present study, the cultured ECs were subjected to a constant shear flow (12 dyn/cm(2)) in a parallel flow chamber system. We investigated the expression of three key enzymes for H2S biosynthesis, cystathionine-gamma-Iyase (CSE), cystathionine-beta-synthase (CBS), and 3-mercapto-sulfurtransferase (3-MST). Shear flow markedly increased the level of 3-MST. Shear flow enhanced the production of H2S was determined by NBD-SCN reagent that can bind to cysteine/homocystein. Exogenous treatment of NaHS that can release gaseous H2S, ECs showed an increase of phosphorylation in Akt(S473), ERKT202/Y204 and eNOS(S1177). This indicated that H2S can trigger the NO-production signaling cascade. Silencing of CSE, CBS and 3-MST genes by siRNA separately attenuated the phosphorylation levels of Akt(S423) and eNOS(S1177) under shear flow conditions. The particular mode of shear flow increased H2S production. The interplay between H2S and NO-generating enzymes were discussed in the present study. (C) 2015 Elsevier Inc. All rights reserved.
Investigation of the semi-dimple vortex generator applicable to fin-and-tube heat exchangers
(2015-09-05)
Wang, Chi-Chuan
;
Chen, Kuan-Yu
;
Lin, Yur-Tsai
;
機械工程學系
;
Department of Mechanical Engineering
The present study examines the air side performance of the fin-and-tube heat exchangers having semi-dimple vortex generator or plain fin geometry. A total of eight samples are made and tested with the corresponding fin pitch (F-P) being 1.6 mm and 2.0 mm and the number of tube row (N) are 1 and 2. The inlet air flow direction is also being tested upon the proposed semi-dimple VG. Test results indicate that the heat transfer performance of the proposed semi-dimple VG with N = 1 at a smaller fin pitch of 1.6 mm is slightly higher than that of plain fin geometry. For N = 1 with a larger fin pitch of 2.0 mm, the semi-dimple VG is about 10% higher than that of plain fin geometry. The difference in heat transfer performance amid VG and plain fin geometry becomes more pronounced with N = 2 and is especially evident when F-P = 2.0 mm due to mixing contribution. In general, the difference between plain and semi-dimple geometry becomes more conspicuous at a larger fin pitch because of the comparatively effectively swirled motion. Both geometries show a dependence on fin pitch at N = 1 but the effect is almost negligible when N is increased to 2. The inlet air flow direction casts negligible influence on the heat transfer performance of semi-dimple VG. However, the friction factors for the opposite air flow operation is lower than that of normal operation, especially in low Reynolds number region. (C) 2014 Elsevier Ltd. All rights reserved.
交大e-News第193期-績優導師專題故事
(2015-09-07)
國立交通大學秘書室
;
Secretariat
4.8 Gbit/s 16-QAM-OFDM transmission based on compact 450-nm laser for underwater wireless optical communication
(2015-09-07)
Oubei, Hassan M.
;
Duran, Jose R.
;
Janjua, Bilal
;
Wang, Huai-Yung
;
Tsai, Cheng-Ting
We experimentally demonstrate an underwater wireless optical communications (UWOC) employing 450-nm TO-9 packaged and fiber-pigtailed laser diode (LD) directly encoded with an orthogonal frequency division multiplexed quadrature amplitude modulation (QAM-OFDM) data. A record data rate of up to 4.8 Gbit/s over 5.4-m transmission distance is achieved. By encoding the full 1.2-GHz bandwidth of the 450-nm LD with a 16-QAM-OFDM data, an error vector magnitude (EVM) of 16.5%, a signal-to-noise ratio (SNR) of 15.63 dB and a bit error rate (BER) of 2.6 x 10-3, well pass the forward error correction (FEC) criterion, were obtained. (C) 2015 Optical Society of America
Solvent-Induced Dewetting on Curved Substrates: Fabrication of Porous Polymer Nanotubes by Anodic Aluminum Oxide Templates
(2015-09-08)
Chi, Mu-Huan
;
Chang, Chun-Wei
;
Ko, Hao-Wen
;
Su, Chun-Hsien
;
Lee, Chih-Wei
Dewetting of polymer thin films triggered by thermal or solvent annealing on flat substrates have been widely studied. Research on dewetting of polymer thin films on curved substrate, however, has been rarely investigated and remains a great challenge, especially for dewetting induced by solvent annealing. In this work, we study the dewetting of polymer thin films on curved substrates by annealing poly(methyl methacrylate) (PMMA) nanotubes in cylindrical nanopores of anodic aluminum oxide (AAO) templates via dimethylformamide (DMF) vapor treatment. After solvent annealing, dewetting of the curved PMMA thin films is induced, resulting in the formation of porous PMMA nanotubes. By changing the experimental conditions such as annealing time, solvent quality, and molecular weight of polymer, the hole sizes of the PMMA nanotubes can be controlled or even prevented. To demonstrate the universality of this method, porous nanotubes of polystyrene (PS) and fluorescent pyrene-ended PMMA (Py-PMMA) are also fabricated. This work not only provides a better understanding of dewetting of polymer thin films on curved substrates but also offers a promising new way to prepare porous polymer nanotubes with controllable hole sizes.
Impacts of high-electroactive-surface-area buckypaper counter electrodes on the photovoltaic performance of dye-sensitized solar cells
(2015-09-09)
Cheng, Cheng-En
;
Lin, Yu-Chang
;
Tsai, Shang-Yi
;
Lin, Zheng-Kun
;
Lee, Ping-Chen
In this paper we study the photovoltaic performance of dye-sensitized solar cells (DSCs) with high-electroactive-surface-area buckypaper (BP) counter electrodes (CEs). BP is made of entangled multi-walled carbon nanotubes and has a high electroactive surface area, which is effectively 11.5 times higher than that of Pt. The high surface area of BP causes a high I-3(-) reduction rate at the CEs and suppresses the charge recombination at the anodes. Accordingly, the open-circuit voltage, the filling factor, and the power conversion efficiency of DSCs with BP CEs are enhanced, and these photovoltaic parameters exhibit a better trend with the increase of solar power compared with conventional DSCs with Pt CEs.
Switching Kinetic of VCM-Based Memristor: Evolution and Positioning of Nanofilament
(2015-09-09)
Chen, Jui-Yuan
;
Huang, Chun-Wei
;
Chiu, Chung-Hua
;
Huang, Yu-Ting
;
Wu, Wen-Wei
The filament in a Au/Ta2O5/Au system is analyzed and determined to be a nanoscaled TaO2-x filament. A shrunken anode localizes the filament formation and the defect boundary leads to faster accumulation of oxygen vacancies. The defect changes the switching domination between electron transport and oxygen-vacancy migration. The migration of oxygen vacancies limits the filament dynamics, indicating the crucial role played by oxygen defects.
CONSTANT TRANSCONDUCTANCE BIAS CIRCUIT
(2015-09-10)
Wang Yu-Jiu
;
CHU Ching-Yun
A bias circuit is adapted for biasing a to-be-biased transconductance cell such that the to-be-biased transconductance cell has a constant transconductance, and includes a converter and a controller. The converter receives first and second current signals, and generates, based on the first and second current signals, a first voltage signal, a second voltage signal and a bias voltage that is for biasing the to-be-biased transconductance cell. The controller receives the first and second voltage signals from the converter, generates the first and second current signals for the converter based on the first and second voltage signals so as to make a magnitude of the first voltage signal equal a magnitude of the second voltage signal.
Neural interfaces with electrically controllable delivery of manganese ions applied for MEMRI-functionalized deep brain stimulation
(2015-09-10)
Huang, Wei-Chen
;
Lo, Yu-Chin
;
Chen, You-Yin
;
Chen, San-Yuan
;
材料科學與工程學系
Single Molecule Take-and-Place Technique for Positioning a Membrane Protein on a Lipid Bilayer
(2015-09-10)
Liu, Tseng-Huang
;
Huang, Yun-Tzu
;
Cheng, Hui-Wen
;
Chen, Yen-Wei
;
Lee, Ching-Hung
Manipulating a single protein molecule on liposomes or planar lipid bilayers is a useful technique for studying membrane-bound proteins, receptors, or ion transporters and for delicate applications including biosensor chips, drug screening, and clinical diagnoses. However, several key breakthroughs are required for success through difficult techniques such as single protein take-and-place with reasonable spatiotemporal control. In this report, a novel method was established for placing a single transmembrane protein onto a patterned lipid bilayer. A surface-functionalized 1.8 nm gold nanoparticle was first engineered at the tip of an atomic force microscope. A single transmembrane protein, H+-translocating pyrophosphatase with six-histidine residues tag, was then picked up using such a microscopy tip where its nanoparticle was modified by nickel-nitrilotriacetic acid. Two-step fluorescence bleaching observation and quantum dot blinking analysis subsequently verified successful manipulation of a single functional protein on a lipid membrane in a predetermined manner. Furthermore, the enzymatic activity from the single H+-translocating pyrophosphatase was determined, demonstrating that membrane proteins retain their functions on the lipid bilayer through a single-molecule take-and-place technique. This innovative technique overcomes current limitations and provides a single biomolecule nanomanipulation system for versatile studies of membrane-bound proteins.
New Measurement of Antineutrino Oscillation with the Full Detector Configuration at Daya Bay
(2015-09-11)
An, F. P.
;
Balantekin, A. B.
;
Band, H. R.
;
Bishai, M.
;
Blyth, S.
We report a new measurement of electron antineutrino disappearance using the fully constructed Daya Bay Reactor Neutrino Experiment. The final two of eight antineutrino detectors were installed in the summer of 2012. Including the 404 days of data collected from October 2012 to November 2013 resulted in a total exposure of 6.9 x 10(5) GW(th) ton days, a 3.6 times increase over our previous results. Improvements in energy calibration limited variations between detectors to 0.2%. Removal of six Am-241-C-13 radioactive calibration sources reduced the background by a factor of 2 for the detectors in the experimental hall furthest from the reactors. Direct prediction of the antineutrino signal in the far detectors based on the measurements in the near detectors explicitly minimized the dependence of the measurement on models of reactor antineutrino emission. The uncertainties in our estimates of sin(2)2 theta(13) and vertical bar Delta m(ee)(2)vertical bar were halved as a result of these improvements. An analysis of the relative antineutrino rates and energy spectra between detectors gave sin(2)2 theta(13) = 0.084 +/- 0.005 and vertical bar Delta m(ee)(2)vertical bar = (2.42 +/- 0.11) x 10(-3) eV(2) in the three-neutrino framework.
以協作平台上之版本修訂記錄進行資訊隱藏之方法
(2015-09-11)
李雅琳
;
蔡文祥
一種以協作平台上之版本修訂記錄進行資訊隱藏之方法，包括下列步驟：建立一協作資料庫，該協作資料庫中包括複數文章及複數修訂記錄；於一協作平台上輸入一掩護文件、一秘密訊息及一金鑰，該協作平台自動將該掩護文件轉變成模擬多人協作過程之一隱蔽文件，該隱蔽文件中包含該秘密訊息；以及擁有該金鑰的至少一授權使用者從該隱蔽文件中抽取出該秘密訊息。
記憶體系統之全套平行編碼方法與全套平行解碼方法
(2015-09-11)
朱家慶
;
林義閔
;
楊其衡
;
張錫嘉
一種記憶體系統之全套平行編碼方法，該記憶體系統包含一記憶體元件、一寫入電路、具有一全套平行架構之一編碼器以及一解碼器，該全套平行編碼方法包含：在具有該全套平行架構之該編碼器中，將編碼方法採用之一生成多項式分解為複數個最小多項式；求取該些最小多項式之複數個根；以及依據該些根產生一編碼矩陣；分解該編碼矩陣為複數個分解矩陣，其中該等分解矩陣其中之一為一校驗矩陣之一部分矩陣，該校驗矩陣對應於該解碼器之一徵兆值計算器之一硬體電路，該等分解矩陣其中之一對應於該硬體電路之一部分；由具有該全套平行架構之該編碼器該利用該硬體電路之該部分，對一組碼字(codeword)進行編碼；以及透過該寫入電路傳送該組碼字至該記憶體元件。
背光模組
(2015-09-11)
陳柏村
;
胡雅文
;
潘瑞文
一種背光模組，包括：一導光模組，包括：一第一導光板，具有一第一底面以及一第一頂面；一第二導光板，具有一第二底面、一第二頂面以及一連接該第二底面與該第二頂面的連接面，且該第二底面位於該第一頂面與該第二頂面之間，該第二導光板包括多個聚光部，各該聚光部具有一入光面以及一出光面，該出光面連接該連接面，且該出光面的寬度大於該入光面的寬度；多個第一微結構，位於該第一底面上，並由該第一底面向外突出；以及多個第二微結構，位於該第二頂面上，並由該第二頂面向外突出；多個第一光源，位於該些入光面旁；以及多個第二光源，位於該連接面旁。
具高度選擇性的生物感測材料及方法
(2015-09-11)
劉典謨
;
簡仁德
;
周昊勳
;
蕭孟軒
;
鄭暐達
一種具高度選擇性的生物感測材料，包含有：一載體溶液，係為一幾丁聚醣高分子自組裝形成核殼結構於其中之水溶液；及複數奈米金屬粒子，吸附並分散於該核殼結構表面；其中，該些複數奈米金屬粒子和該載體溶液係混合形成為一幾丁聚醣-奈米金屬粒子核殼結構複合溶液，且該幾丁聚醣-奈米金屬粒子核殼結構複合溶液之pH值係接近並小於特定之一生物分子的等電位點(IEP)，而讓該些奈米金屬粒子對於該生物分子具有專一選擇性吸附能力。
睡眠呼吸暫止症偵測系統及方法
(2015-09-11)
方偉騏
;
陳小予
;
黃騰頡
一種睡眠呼吸暫止症偵測系統，其包括：偵測模組，係依據小波轉換偵測法偵測心電訊號之複數個R波之峰值時間點；處理模組，係依據該些峰值時間點計算出該些R波於預定時間範圍之面積，以依據該些面積產生複數個第一R波面積訊號，並依據該些峰值時間點及該些第一R波面積訊號形成心電提取呼吸訊號，且該處理模組復調整該些第一R波面積訊號之極值；轉換模組，係將該心電提取呼吸訊號轉換為頻率訊號；以及判斷模組，係判斷該頻率訊號之最大峰值之頻率是否位於該頻率訊號之第一頻率區間，若是，該判斷模組復比較該頻率訊號之最大峰值與預定之門檻值，當該頻率訊號之最大峰值之頻率位於該第一頻率區間且該頻率訊號之最大峰值大於該門檻值時，該判斷模組判定該頻率訊號為呼吸暫止訊號，而當該頻率訊號之最大峰值之頻率位於該第一頻率區間且該頻率訊號之最大峰值小於該門檻值時，該判斷模組判定該頻率訊號為混雜訊號。
具紫外光吸收層之薄膜電晶體
(2015-09-11)
謝漢萍
;
劉柏村
;
蔡韻竹
;
蔡旻諺
;
鄧立峯
一種薄膜電晶體，包括：一透明基板：一閘極，該閘極設置於該透明基板上，其中該閘極之材料係由銦錫氧化物(ITO,Indium tin oxide)、銦鋅氧化物(IZO,indium zinc oxide)，摻雜鋁之氧化鋅(AZO,Al-doped ZnO)，銅(Cu)，銀(Ag)，鋁(Al)以及鉬(Mo)所組成之族群中所選出；一閘絕緣層，該閘絕緣層設置在該閘極上及該透明基板上，其中該閘絕緣層之材料係由氧化鉬鋅(Mo-Zn-O)以及氧化鋯鋅(ZrZnO)所組成之族群中所選出；一半導體主動層，該半導體主動層設置在該閘絕緣層上，其中該半導體主動層之材料係由氧化鋅(ZnO)，氧化銦(In2 O3 )，ZTO，IGO，IZTO，AZTO以及HIZO所組成之族群中所選出；一電極層，該電極層設置在該半導體主動層上且曝露出部份該半導體主動層，其中該電極層之材料係由銦錫氧化物(ITO,Indium tin oxide)，銦鋅氧化物(IZO,indium zinc oxide)，摻雜鋁之氧化鋅(AZO,Al-doped ZnO)，銅(Cu)，銀(Ag)，鋁(Al)以及鉬(Mo)所組成之族群中選出；以及一紫外光吸收層，設置在該半導體主動層上，其中該紫外光吸收層係由氧化鉬鋅(Mo-Zn-O)以及氧化鋯鋅(ZrZnO)所組成之族群中所選出。