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Hydrogen Functionalization of Graphene using RF Plasma for photodetection
The growth of the internet is propelling an ever-increasing need for faster communication. Modern telecommunication data is mainly carried through fibre-optic cables, with pulses of light representing bits of data; the main factor limiting data transfer speed is the rate at which the optical receiver at the opposite end of the cable can detect light pulses. Graphene-silicon Schottky photodiodes are a promising alternative to traditionally-used germanium photodiodes, promising higher detection frequency and better contrast between light and dark. To make it less susceptible to erroneous measurements due to graphene having a low band gap, hydrogen functionalisation was used to increase the barrier potential of the Schottky diode so that a higher voltage would be required to allow current to pass through in forward voltage bias and trigger the sensor. This study seeks to determine the optimal conditions — of physical proximity, duration of exposure, and plasma power — for hydrogen functionalisation using radio frequency plasma. Graphene was synthesised using low pressure chemical vapour deposition, then transferred onto P-type silicon to create a photodiode. The graphene-silicon photodiode was then doped with hydrogen plasma to introduce defects in the graphene layer to increase the barrier potential of the photodiode. To assess the effectiveness of hydrogen functionalisation, photocurrent measurements were conducted while light was shone onto the photodiode in pulses of increasing frequency to find the magnitude and spontaneity of the response. Light was shone in pulses of 100ms, and was successfully detected by the photodiode. The pulse spacings were gradually decreased and it was found that the diode was able to detect pulse spacings as low as 1µs, significantly better than germanium photodetectors. The sample demonstrated clear optoelectronic response and was sensitive to changes in frequency. Results show that the intensity of the optoelectronic response in graphene-silicon diodes is inversely related to its physical proximity to the plasma source during hydrogen functionalization; and directly related to the power of the plasma and to the duration of exposure up to a point, after which it will deteriorate. Thus, it can be concluded that graphene-silicon Schottky diodes offer much promise in electronic communication.
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本作品研究了遊戲Cube中正四面體的滾動特性、色漆位置及最少步數解,並將三角網格轉換為方形網格,同時推廣至整個平面且為方形網格定義坐標。由於遊戲中考慮「回黏」時將較複雜,故作品前半部分先在不回黏的情況下做討論,並為了計算解題之「最短路徑長」,先求出任兩方格間「距離」,再將各方格間距離整理為表格,藉表格中行、列位置關係得出計算最短路徑長之公式。 而作品書後半段說明當考慮回黏時的情況,並因過程中需要求出任兩方格間滾動路徑上會經過A,B,C,D之個數,最後分析正四面體身上帶有色漆時對移動步數之影響。由於上述所有公式統整後非常繁複,故我們另借助Python將之統整並計算出回黏之最短路徑長。
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探討粒線體對果蠅卵巢生殖幹細胞維持的影響
幹細胞會進行不對稱分裂以維持組織恆定,一個子細胞分化為有特定功能的細胞,而另一個則維持其細胞潛能。粒線體能進行分裂和融合並維持動平衡。現今的研究已經了解,誘導型多能幹細胞(iPSC)的粒線體動平衡變化會促使其直接分化 (Seo BJ, et al., 2018)。然而,果蠅卵巢生殖幹細胞(GSC)內粒線體動平衡與幹細胞分化的關聯仍不清楚。本研究利用容易辨認的果蠅卵巢生殖幹細胞來探討這個問題,並使用Gal4-UAS系統與RNAi操縱粒線體動平衡,並發現粒線體融合蛋白被抑制會導致油滴堆積及幹細胞損失。另外,使用左旋肉鹼(L-carnatine)增進脂肪酸代謝,發現增進代謝會導致油滴減少及幹細胞回復。本研究著重於探討粒線體動平衡對GSC維持與脂肪酸代謝的影響,並對粒線體脂肪酸代謝與幹細胞分化的潛在關係提出觀點與佐證,盼未來能有更進一步的研究與醫療方面的應用。
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Method of prosthetic vision
This work is devoted to solving the problem of orientation in the space of visually impaired people. Working on the project, a new way of transmitting visual information through an acoustic channel was invented. In addition, was developed the device, which uses distance sensors to analyze the situation around a user. Thanks to the invented algorithm of transformation of the information about the position of the obstacle into the sound of a certain tone and intensity, this device allows the user to transmit subject-spatial information in real time. Currently, the device should use a facette locator made of 36 ultrasonic locators grouped in 12 sectors by the azimuth and 3 spatial cones by the angle. Data obtained in such a way is converted into its own note according to the following pattern : the angle of the place corresponds to octave, the azimuth corresponds to the note and the distance corresponds to the volume. The choice of the notes is not unambiguous. However, we used them for the reason that over the centuries, notes have had a felicitous way of layout on the frequency range and on the logarithmic scale. Therefore, the appearance of a new note in the total signal will not be muffled by a combination of other notes. Consequently, a blind person, moving around the room with the help of the tone and volume of the sound signals, will be able to assess the presence and location of all dangerous obstacles. After theoretical substantiation of the hypothesis and analysis of the available information, we started the production of prototypes of the devices that would implement the idea of transmitting information via the acoustic channel.
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Anti-bacterial Crab bio-bandages with Bio-dressings 2.0
Commercially available bandages such as hydrocolloid are neither biodegradable nor anti-bacterial. Chitin is known to be the second most naturally available polysaccharide which could be transformed to chitosan which is known to be anti-bacterial (Hasan, 2018) (Chao, 2019) and haemostatic (Okamoto, 2003) (Hu, 2018). Chitosan can be further converted to hydrogel which is bio-degradable and has good water absorbance. Anti-bacterial crab bio-bandages and crab bio-dressings should be bio-degradable as it took 42 days and a month for complete bio-degradation respectively, so they should be better than commercial bandages such as Nexcare Hydrocolloid as the disposal of anti-bacterial crab bio-bandages with bio-dressings would no longer pose burden to landfilling or threat to our environment. Anti-bacterial crab bio-bandages with bio-dressings are anti-bacterial with degree of deacetylation of DD% (measured using FTIR Spectrum II) 82.6% (due to the presence of chitosan) even without the application of other anti-bacterial agents and hence can provide complete protection of wounds from skin and soft tissues infections and haemostatic (due to the presence of chitosan). After testing and certification based on IS997:2004 and BS EN 13726-1, they should meet many requirements specified. Anti-bacterial crab bio-bandages should be eligible for marketing. Some results were as follows: 1.4 Anti-bacterial effect of crab hydrogels and roasted crab hydrogels Pure chitosan, crab chitosan, crab hydrogels and roasted crab hydrogels showed significant anti-bacterial effect. NO oral bacterial colonies were present in drinking water with crab hydrogels. Thus crab hydrogels could serve as effective anti-bacterial wound dressings. 1.6 Basing on IS997:2004 standard, the load per unit of area of anti-bacterial bio-bandages was 342g/m2 which met the minimum requirement of 36g/m2, the anti-bacterial bio-bandages had stronger tension strength (>20N both in dry and wet conditions) than commercial hydrocolloid. (2.7N dry 2.8N wet) which was comparable with that required (50-67N) and pH of about 7 which met the pH range of 4.5-8. 1.7 The FSA Free-Swell Absorbency of synthetic blood of crab hydrogel bio-dressings was 1.86g per 5cm x 5cm dressing which was much higher than that of commercial hydrocolloid (0.299g per 5cm x 5cm dressing) based on BS EN 13726-1.
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銅鋅生長之術~探討電解硫酸鋅溶液之研究
本研究秉持綠色化學之精神自製反應槽,並探討電解硫酸鋅溶液之研究。實驗就電極距離(1.0 ~ 2.0 cm)、施加電壓(9 ~ 21V)、溶液濃度(1x10-3 M~1x10-2 M)、不同正極材料和不同金屬溶液(分別包含Zn2+、Sn2+、Ag+、Co2+)進行討論。 當電解硫酸鋅溶液且鋅為正極時,電極距離之倒數和鋅金屬生長速率呈正比。當施加較大電壓時,鋅金屬生長速率有越快的趨勢,電解溶液濃度和在45秒內析出鋅金屬量成正比,也和鋅金屬生長速率成正比。 當電解硫酸鋅溶液且銅為正極時,除鋅金屬析出外也發現銅金屬析出,溶液濃度越高則銅金屬生長位置距離負極越遠。當電解1x10-2 M不同金屬離子溶液時,金屬生長速率快慢為銀>錫>鈷>鋅,而銅金屬生長距負極距離為鋅>鈷>錫>銀。
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最近看到媒體報導,住家火災發生時,因為無法逃生,常造成不可彌補的遺憾。我們猜想,若是校園中,一旦發生火警或地震,處於室內的師生,一瞬間湧向出口時,是否會因為出口前擺置的櫃子或桌子阻隔,導致疏散效率不佳,造成更大的傷亡? 我們提出一個簡單的室內模型,看看在出口前,若是設有阻隔物,是否有助於人員的分流,進而提高疏散的效率,或者,出口前的阻隔物,反而會形成疏散時的阻礙,延緩逃生的效率? 實驗發現,出口前若設置單一阻隔物,的確會增加疏散的時間,雖然延緩的時間有限,但對於逃生來說,每一秒鐘都是珍貴的。因此,現實生活中的教室,在出口門前,應該儘量保持淨空,以因應緊急逃生的狀況。
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透過紡織品形成空氣層,達到減緩人體熱能散失是禦寒保暖的策略之一。市售發熱衣為本校學童內搭衣主流,以聚酯纖維、聚丙烯腈、嫘縈及彈性纖維為主材質。其中以聚酯纖維為主要材質的發熱衣較容易達到比純棉內衣更好的保暖效果。在流汗及微風(蒲福風級表)的情境中,發熱衣蓄熱保暖的效果均劣於純棉內衣。而市售發熱衣所標榜發熱技術,其效果甚微。穿著發熱衣時仍需配合當日天氣與活動搭配防風或排汗衣物,才能達到保暖蓄熱的最佳效果。
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自從2019年底開始爆發新冠肺炎疫情(COVID-19)以來,搶口罩的事件以及各式口罩的品質與醫療防護力問題引發社會關注。而臺灣醫療口罩品質之所以能夠獲得世界各國肯定的最大功臣就是口罩中間的熔噴不織布(聚丙烯PP)和其中的「靜電駐極」技術,將口罩過濾效果從30%~50%(聚丙烯-物理過濾)提升至95%~99%(靜電吸附加持)。 此研究主要目的在於探討如何比較靜電量的大小差異(鋁箔驗電器、保麗龍球、衛生紙碎),還有如何有效的產生靜電(摩擦起電、電蚊拍尖端放電、范氏起電器),以及將靜電量儲存於口罩內的熔噴不織布中。利用空氣質量檢測儀及自製的檢測箱來對照比較有無靜電的口罩防護性差異,採取簡單的方式有效提升一般性口罩與過期醫療口罩的過濾效果,進行相關實用性的探究。
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製備超疏水性修飾石墨烯海綿應用於廢油回收
本研究使用聚胺基甲酸酯海綿為基材,藉由在表面吸附石墨烯材料使海綿具有超疏水性,使其能從水中有效分離出油類,達到油水分離的效果。我們研究出簡易自製氧化石墨烯的方法,並使用自創的照紫外光乙醇法將其還原成還原氧化石墨烯,接著吸附在海綿上,再使用十三氟辛基三乙氧基矽烷修飾石墨烯海綿,使其鍵結上具有超疏水性官能基。藉由測量海綿表面與水珠間的接觸角,我們找出了製做超疏水性海綿的最佳條件,最終完成了矽烷修飾還原氧化石墨烯聚胺基甲酸酯海綿(FS-rGO-PU Sponge)。 本研究超疏水性海綿的製程簡易、成本低且符合綠色化學,同時具有單位體積吸油量大,可多次重複使用等優點,我們除了測試其對食用油、礦物油的回收能力,並製作成可連續分離油水的裝置,可應用在工業、家庭廢油及海上油汙的回收,甚至可做為空氣清淨機或排油煙機的濾網。
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誤會大了!離開檳榔走出自己的路!~家鄉荖葉去污功效與應用之探討
荖葉通常出現在檳榔攤用來包檳榔,造成世人誤解以為是導致口腔癌幫兇,但從各類文獻資料得知荖葉有很多功效,例如:清潔去污、抑菌、去味。為了證明荖葉並非只有壞處,因此製作清潔劑研究它去除碗裡污漬的能力、並將荖葉應用在六年級下學期發黴實驗來試驗不同比例荖葉葉子水放入牛奶和吐司會不會抑制發黴,更試著製作荖葉洗滌皂去除布上污漬,最後我們與家鄉四芳社區交流合作,將它應用在生活清潔用品、甚至製作放入藥材及料理中。透過深入認識在地特產荖葉,我們不只希望幫忙荖葉去除汙名,更希望為家鄉的荖葉產業注入新的可能性,開發本地特色產業。
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「金」「壁」「灰」煌-會呼吸的智慧多孔創新材料初探
金門居民根深蒂固「拜越多、燒越多、保佑越多」的風俗習慣,導致金紙灰滿天飛,嚴重汙染,我們無法改變居民陋習,加上金門材料出問題人心惶惶,因此結合兩大問題,邁向「清淨家園」。 實驗發現,以金紙灰分別替代砂和水泥,製成「會呼吸的智慧多孔創新材料」,不同替代率有不同的功能,替代5%砂和20%水泥以內,符合結構強度210kgf/cm2抗壓強度的需求;替代35%、40%水泥及35%砂作為「會呼吸的智慧多孔創新材料」的效果最佳。並實作校園生態池和洗手檯、開設diy課程推廣自製文創小物。 「會呼吸的智慧多孔創新材料」可應用於建築物外殼節能材料、室內牆板與裝修材料、綠化植生生態材料,綠色環保材料,已獲水泥預拌廠同意推廣,有賴官方納入施工規範。
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