Browsing by Issue Date, starting with "2014-12-17"

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Characterization and density control of GaN nanodots on Si (111) by droplet epitaxy using plasma-assisted molecular beam epitaxy
(2014-12-17)
Yu, Ing-Song
;
Chang, Chun-Pu
;
Yang, Chung-Pei
;
Lin, Chun-Ting
;
Ma, Yuan-Ron
In this report, self-organized GaN nanodots have been grown on Si (111) by droplet epitaxy method, and their density can be controlled from 1.1 x 10(10) to 1.1 x 10(11) cm(-2) by various growth parameters, such as substrate temperatures for Ga droplet formation, the pre-nitridation treatment of Si substrate, the nitridation duration for GaN crystallization, and in situ annealing after GaN formation. Based on the characterization of in situ RHEED, we can observe the surface condition of Si and the formation of GaN nanodots on Si. The surface nitridaiton treatment at 600 degrees C provides a-SiNx layer which makes higher density of GaN nanodots. Crystal GaN nanodots can be observed by the HRTEM. The surface composition of GaN nanodots can be analyzed by SPEM and mu-XPS with a synchrotron x-ray source. We can find GaN nanodots form by droplet epitaxy and then in situ annealing make higher-degree nitridation of GaN nanodots.
WAVELENGTH-DIVISION MULTIPLEXING (WDM) OPTICAL FIBER NETWORK SYSTEM
(2014-12-18)
SUNG JIUN-YU
;
CHOW CHI-WAI
;
YEH CHIEN-HUNG
A wavelength-division multiplexing (WDM) optical fiber network system is disclosed, which comprises a signal provider generating at least one set of wavelength signals of a plurality of different wavelengths and coupled to a plurality of modulation modules. The modulation modules respectively coupled to a user receiver. The modulation module comprises a control unit generating a random sequence and a control signal corresponding to the random sequence, and transmitting the control signal to a first modulation unit. The control unit is coupled to the signal provider to receive the wavelength signals and controls the first modulation to retrieve a wavelength signal according to the control signal. The control unit rapidly changes the control signal according to the random sequence whereby the first modulation unit rapidly retrieves the wavelength signals of different wavelengths and transmits them to the user receiver, so as to prevent a specific wavelength from attack.
Incidence rates of tuberculosis in chronic hepatitis C infected patients with or without interferon based therapy: a population-based cohort study in Taiwan
(2014-12-19)
Lin, Shang-Yi
;
Chen, Tun-Chieh
;
Lu, Po-Liang
;
Lin, Chun-Yu
;
Lin, Wei-Ru
Background: It is debated whether interferon-based therapy (IBT) would affect the incidence of active tuberculosis (TB) among hepatitis C virus (HCV) infected patients. Although some case reports have demonstrated a possible association, the results are currently inconclusive. Therefore, we conducted a nation-wide population study to investigate the incidence of active TB in HCV infected patients receiving IBT in Taiwan. Methods: This 9-year cohort study was based on the Longitudinal Health Insurance Database 2000 (LHID 2000) consisting of 1,000,000 beneficiaries randomly selected from all Taiwan National Health Insurance enrollees in 2000 (>23.7 million). This insurance program covers all citizens in Taiwan. We conducted a retrospective cohort study that identified subjects with HCV infection. IBTs were defined as regimens that included interferon alpha, peginterferon alpha 2a and peginterferon alpha 2b for at least 2 months. Among them, 621 subjects received IBT, and 2,460 age-and gender-matched subjects were enrolled for analysis. The Cox proportional hazards models were used to estimate the hazard ratio (HR) for active TB, and associated confidence intervals (CIs), comparing IBT cohort and untreated cohort. The endpoint in this study was whether an enrolled subject had a new diagnosis of active TB. Results: During the 9-year enrollment period, the treated and untreated cohorts were followed for a mean (+/- SD) duration of 6.97 +/- 0.02 years and 8.21 +/- 0.01 years, respectively. The cumulative incidence rate of active TB during this study period was 0.150 and 0.151 per 100 person-years in the IBT treated and untreated cohorts, respectively. There was no significant difference in the incidence of active TB in either cohort during a 1-year follow-up (Adjusted Hazard Ratio (AHR): 2.81, 95% Confidence Interval (95% CI): 0.61 - 12.98) or the long-term follow-up (AHR: 1.02, 95% CI: 0.28 - 3.78). The Cox proportional hazards model demonstrated that IBT was not a risk factor for active TB. The only risk factor for active TB was the occurrence of hepatic encephalopathy. Conclusion: Our results showed that IBT is associated with increased hazard of active TB in HCV infected patients in 1-year follow-up; however, the effect sizes were not statistically significant.
Study on Anharmonic Effect of the Unimolecular Reaction of CH2(D-2)FO
(2014-12-20)
Zhong, Jingjun
;
Li, Qian
;
Luo, Ji
;
Xia, Wenwen
;
Yao, Li
Study on the unimolecular reaction for CH2FO and CD2FO is carried out. The structures, energy barriers and zero point energy of the three channels in the title unimolecular reactions are computed with the MP2/6-311++G(3df, 3pd) method. RRKM theory is used to calculate the rate constants of canonical case at temperature range of 500-5000 K and microcanonical system at total energy of 19.05-71.68 kcal/mol. The results indicate that the anharmonic effect and isotope effect are very small for the three channels, and the anharmonic rate constants, around 10(9)-10(11) s(-1), are close to the experimental prediction reasonably.
Wide-converter lens design for a pico projector
(2014-12-20)
Pan, Jui-Wen
;
Chen, Yi-Chin
;
光電系統研究所
;
照明與能源光電研究所
;
生醫電子轉譯研究中心
In this paper, we propose a concept for the design of a 0.702x wide-converter lens for a 0.3 in. digital micromirror device. This 0.702x wide-converter lens is capable of enlarging the size of the original projected image at the same projection distance. This 0.702x wide-converter lens is attached in front of the projection lens of a pico projector (PP). Compared with the projection lens of a PP without the 0.702x wide-converter lens, there is an increase in the size of the original projected image of 42.4% at the same projection distance. In other words, there is a saving of projection distance of 29.78% to obtain a projected image of the same size. (C) 2014 Optical Society of America
Thermally Induced Percolational Transition and Thermal Stability of Silver Nanowire Networks Studied by THz Spectroscopy
(2014-12-20)
Chen, Jing-Zhi
;
Ahn, Hyeyoung
;
Yen, Shin-Chun
;
Tsai, Yao-Jiun
;
光電工程學系
Great demand toward flexible optoelectronic devices finds metal nanowires (NWs) the most promising flexible transparent conducting material with superior mechanical properties. However, ultrathin metal nanowires suffer from relatively poor thermal stability and sheet conductance, attributed to the poor adhesivity of the ohmic contact between nanowires. Thermal heating and annealing at 200 degrees C increase the conductivity of the metal network, but prolonged annealing accelerates the breakage of NWs near the NW junction and the formation of Ag droplets. In this study, the thermal stability of silver NW (AgNW) films is investigated through the in situ measurements of sheet resistance and terahertz (THz) conductivity. With the improved ohmic contact at the NW junctions by heating, a characteristic transition from the subpercolative to percolative network is observed by in situ THz spectroscopy. It is found that stamp-transferred graphene incorporated with a near-percolative AgNW network can dramatically enhance the thermal stability of the grapheneAgNW (GAgNW) hybrid film. In both in situ measurements, little variation of physical parameters in GAgNW film is observed for up to 3 h of annealing. The presented results offer the potential of graphene-incorporated metal nanowire film as a highly conductive electrode that also has high thermal stability and excellent transparency for next-generation electronics and optoelectronics on flexible substrates.
環型振盪器
(2014-12-21)
何盈杰
;
楊于昇
;
蘇朝琴
本發明係有關於一種環型振盪器，俾能操作於低電壓環境下，且仍具有良好的操作速度及線性度的環型振盪器，包括：N個延遲電路單元，每一延遲電路單元係具有一輸入端及一輸出端，而N係至少為3。其中，每一延遲電路單元係接受一控制電壓，且各延遲電路單元係互相串聯。並且，每一延遲電路單元之輸入端係與相鄰之另一延遲電路單元之輸出端電性連接。
微物品的製造裝置及製造方法
(2014-12-21)
范士岡
;
林庭旭
;
林敬崴
;
吳志明
一種微物品的製造裝置，包括：一第一電極板、一第二電極板及一分隔件。第一電極板包含一成型電極，成型電極的形狀對應於一微物品的一截面，而分隔件設置於第一與第二電極板之間，分隔件的高度對應於微物品的一厚度。藉此，製造裝置可容置可固化的液體於其內，並且可操控可固化的液體依據成型電極的形狀變形，更可以將可固化的液體固化變形後來得到微物品的成品。本發明另提出一種微物品的製造方法。
人生山課　只因身在此山中
(2014-12-21)
李怡安
;
Department of Communication and Technology
;
傳播與科技學系
時常被帶去爬山的安餒，雖然不情願，但也有所收穫。
高中女拳手　打出世界拳王
(2014-12-21)
許鴻財
;
Department of Communication and Technology
;
傳播與科技學系
陳念琴，就讀成德高中的學生，用雙手打去了自已的命運，也打出了世界女拳王。
總編輯的話
(2014-12-21)
謝宜寧
;
Department of Communication and Technology
;
傳播與科技學系
本期共有十三篇稿件。頭題為社會議題〈狹窄巷弄　消防隱憂〉，描述淡水的狹窄巷弄引發消防安全疑慮的相關議題，清楚且多面向的寫出各方意見與爭議。
星際效應　人性與愛的新義
(2014-12-21)
黃馨儀
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Department of Communication and Technology
;
傳播與科技學系
【星際效應】是一部理論基礎深厚的科幻電影，同時在劇中融入感性元素，呈現人性善惡與人類大愛選擇。
部落格業配　可信度惹爭議
(2014-12-21)
陳珮容
;
Department of Communication and Technology
;
傳播與科技學系
部落格業配文存有相當大的爭議，不但有欺騙消費者的嫌疑，效果不實也可能觸犯法律。
跨越障礙追夢者
(2014-12-21)
王彥琪
;
Department of Communication and Technology
;
傳播與科技學系
夢想者聯盟是由一群身心障礙者所組成，他們不因病痛而對夢想卻步，靠著自己的長才，站上舞台。
蛋糕競賽　甜蜜迎聖誕
(2014-12-21)
許翔
;
侯怡安
;
Department of Communication and Technology
;
傳播與科技學系
一年一度的蛋糕比賽，迎接聖誕節的到來。
臺上臺下　歌仔戲精彩絕倫
(2014-12-21)
杜以翔
;
Department of Communication and Technology
;
傳播與科技學系
臺灣歌仔戲班劇團與基隆西定國小同學合作，演出【外木山的草鞋】，臺上一分鐘，臺下十年功。
狹窄巷弄　消防隱憂
(2014-12-21)
吳建勳
;
Department of Communication and Technology
;
傳播與科技學系
發生火災時，狹窄巷道容易造成救災困難，加上違停亂象更是危險，若要拓寬卻面臨許多困難。
室友　我的大學依靠
(2014-12-21)
鄭宇茹
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Department of Communication and Technology
;
傳播與科技學系
我的室友們各有特色，帶給我許多的歡樂。
克拉拉與她的高額頭
(2014-12-21)
陳怡均
;
Department of Communication and Technology
;
傳播與科技學系
傳統觀念中代表運勢的額頭，是克拉拉從小到大最鮮明的特徵，也一路見證了她的成長史。
鄭性澤案　重省司法與死刑
(2014-12-21)
賴坤猷
;
Department of Communication and Technology
;
傳播與科技學系
鄭性澤殺警案疑點重重，近來廢除死刑推動聯盟發起活動，讓更多人了解案件，也引起許多討論。