全國中小學科展

未代表出國作品

佛手瓜卷鬚之向觸性及其參與蛋白質之探討

本研究利用佛手瓜的卷鬚探討向觸性的原理。本研究大致分為兩部份,一方面我們在卷鬚中發現了含量極為豐富的構造,此一螺旋狀構造分布於維管束中,且用雙縮?詴劑檢測後發現其含有蛋白質,且不具有運輸水分的功能;並發現此一構造的分布疏密,會影響到螺旋內側外側以及切割後片段泡溫水的彎曲方向。此外,在進行卷鬚蛋白質電泳的過程中,我們發現使用含尿素的緩衝液萃取蛋白質的效果最佳,1克的卷鬚乾重約可萃取到5毫克的蛋白質,且蛋白質總量會隨著卷鬚的成熟而遞減。利用軟體比對及質譜分析八個蛋白質點,得知此八點的蛋白質為:malate dehydrogenase, oxygen-evolving enhancer protein 1, oxyen-evolving enhancer protein 2, calreticulin, peroxidase, stromal 70 kDa heat shock-related protein, and AP2/ERF and B3 domain-containing transcription repressor。由此可知,向觸性為植物經過一連串訊號傳遞後,對外界刺激的順應。

創新儀器測量光的繞射與干涉之強度分佈

Light diffraction and interference are two of most basic experiments, but they’re the most powerful evident of wave properties of light. Due to the lack of high-quality and fairly accurate equipment, these important experiments are limited to the simple demonstration of the phenomena. Especially, the spatial intensity variations of diffraction and interference patterns are, however, completely not drawn to scale. In order to precisely measure the diffraction and interference patterns intensity, we consult lots of reference, search for suitable materials and reuse waste old and useless laser printers. Finally, overcoming disadvantages of time consumption and poor spatial resolution, we develop two accurate, practical and delicate methods. We use optical power control circuit created on our own to steady the brightness emitting of laser diode. Then the high linear photoelectric detector is stored on XYZ axis micro movement control platform. Next high degree of reflection rotating polygon mirror employing optical lever is collocated with low vibration blushless motor. Thus, a self-scanning intensity pattern plotter is accomplished. At the same time, it overcome difficulties like time wasting and low reliability during doing these kind of optical experiments. In this article these two dependable and worth popularizing measurements of light diffraction and interference is going to be introduced. 光的繞射與干涉實驗是光學中最基本的實驗之一,也是證明光的波動性質之最主要的依據。在一般的高中物理實驗室中受限於器材的等級與精度,只能對光的繞射與干涉做近似定性的實驗,尤其是繞射、干涉圖形上的光能量分佈,完全無法以現有的器材做精準的測量。 在這一年的專題研究中,我們小組針對測量光的繞射、干涉能量分佈為目標,參閱許多相關文獻,四處尋找適用的材料及零件,發揮廢物利用的精神,克服萬難,發展出兩種精巧、實用又準確的測量方法,我們以自行發展的光功率控制電路使雷射二極體的光度穩定,並且以高線性度的光感測元件裝載在自行設計的X.Y.Z微動機台上,同時利用光槓桿原理所構成的高反射度的旋轉六面鏡,配合低震動的無刷馬達,完成了一套能自動掃瞄繞射能量分佈曲線的測試儀,經實際使用相當地穩定可靠,可以快速而精確地獲得大量的實驗數據,比對這些數據不僅能驗證繞射理論,並能更深入地延伸理論的探討。

食品粉末在高電場下噴發行為之研究

很多人都有泡奶粉的習慣,卻偶爾會發現在舀完奶粉後,會有少許奶粉殘留於桌面上,仔細的觀察後發現~舀奶粉時塑膠匙上有叢狀奶粉聚集,且部分奶粉會噴射出去,若奶粉是一般的電偶,理應在排列好後維持穩定的位置,相反的,若奶粉有帶上與塑膠匙面同性的電荷,它應該不會沾附於匙面,而是被斥離。但我們的觀測結果卻同時包含以上兩種現象,我們對此感到好奇而展開研究。

從有限三角和公式研究偶次調和級數之遞迴公式及其相關等式之推廣與應用

本研究中,我們將提出一些新穎結果,著重討論其在三角中的應用;同時,找出其遞迴關係式,得出三角展開式與其所對應之多項式分解式,進而討論出多種的規律性及所涵蓋的內容及推廣性質,我得到很多高中數學公式無法推導出在【4】和【8】中的漂亮公式及創新的結果,且這些等式都是由我們不太瞭解的無理數所構成的。 主要是討論我們在【7】中所得到的收穫與經驗;複數是三角、幾何、代數互動的橋樑,我是以不同的角度及嶄新的方法來綜合探討在【6】中相關的應用。提出關於正整數平方的倒數和公式更為精簡且基本的證明,將 sin−2 x 表示成級數形式的部分分式,進而應用在(a,b) = 1的機率問題上;並研究相關的等式,直接透過三角與代數來研究關於 2p 次方的倒數之求和問題,得出級數 之和的有用遞迴公式,並與最重要的常數扯上關係。 For one thing, we present diverse methods to evaluate finite trigonometric summation and related sums. Trigonometric summations over the angles equally divided on the upper half plane are investigated systematically. Several related trigonometric identities are also exhibited. What is more, we use methods of calculus, and make several surprising and unexpected transformations. A useful recursive formula for obtaining the infinite sums of even order harmonic series, infinite sums of a few even order harmonic series, which are calculated using the recursive formulas, are tabulated for easy references. Furthermore, is there any interesting results and applications? Finally, the purpose of this paper is to develop a new proof of and related identities, but their derivations are more complicated. The following studies are completed under the instruction of the professor.

探討茶液成分受光及貯存時間之影響

Tea is the most widely accepted and consumed beverage worldwide due to its characteristic aroma and taste. Recent studies have provided the strong scientific basis for understanding the health promoting effects and cancer preventive actions of tea. The components of tea especial the catechins are varied with the conditions of making tea. To understand and determine the chemical composition of tea is very important. Some investigations of the parameters on the storage and making of tea were carried on in this study. The kinds of tea studied were including black tea, oolong tea, green tea, and instant tea bags. A high performance liquid chromatograph combined with UV detector and mass spectrometer used to analyze the components of tea. The results showed that the composition of tea solution is dependant of the exposure of light. One of the components of tea, (-)-epicatechin methylgallate (ECMG) was oxidized to quino form. The concentrations of (-)-catechin gallate (ECG) decreased and one of new compound (M.W. 442) produced with increasing the storage time. From the results show tea made with cold water is better than that made with hot water. The ingredients in green tea were changed faster than those in fermentative black tea and oolong tea. The components of tea can be kept unchanged for a long time at low temperature. In refrigerator, the time can be extended to overnight. 茶由於其具有特殊的芳香氣味及口味,廣泛地被世人用為飲料,近年來的研究證據顯示茶具有促進身體健康和防癌功效,但茶中成分之變化,尤其兒茶素隨茶的種類、茶沖泡保存方式及置放時間而有所不同,因此對於茶中成分及沖泡方式的認知是一門重要的課題。 本實驗主要是探討茶沖泡時間及貯存條件,對於茶液所含兒茶素變化的影響,探討的茶包含紅茶、烏龍茶、綠茶及其茶包。並使用質譜儀及高效能液相層析質譜儀配備紫外光偵測器分析茶液中之成分,實驗結果顯示成分變化速率以未發酵的綠茶較發酵的紅茶和烏龍茶快;低溫儲存時,亦可延緩茶液成分的變化,例如加蓋並存放於冰箱,則茶置放至隔夜其成分均未改變;同時結果顯示成分產生變化者,主要為兒茶素氧化,如將多酚類氫氧基經氧化變成?(quino) ,其次為斷裂再產生聚合其中綠茶以不照光變化較大。本研究並經實驗發現如果以冷開水沖泡綠茶20~30分鐘,咖啡因的溶出量雖略多於沖泡2分鐘的熱茶,但各種兒茶素的溶出量卻遠高之,尤其置放至隔夜茶液成分仍無氧化現象。

台灣稀有水生植物蓴菜生長型態構造觀察成分分析研究

本研究針對台灣產水生植物,蓴菜之構造與生長環境、蓴菜對腸胃道常見致病細菌之抑菌效果以及主要成分暨化合物分析。由本研究結果得知,崙埤湖內之稀有浮葉型水生植物蓴菜,其生長環境為無汙染之乾淨偏酸性水源,最適合生長之生深為50-160 ㎝;水溫則為22-25℃;而蓴菜之地下根莖對表皮金黃葡萄球菌(Staphylococcus aureus)具有輕度之抑菌效果,經由分離純化得知為BS-1:沒食子酸(Gallic acid);另外,由蓴菜之葉片分離出十種成分分別為BS-2 (Kaempferol-7-O-Glucosids)、BS-3 (Quercetin-7-O-glucosids)、BS-4(5,8,4’-Trihydroxyflavone-7-O-glucosids)、BS-5 (3,5,8,3’4’-Pentahydroxy flavone)、BS-6(Vitamin E: d-Tocopherol)、BS-7 (Glyceride)、BS-8 (Phenolic A)、BS-9(Quercetin)、BS-10(Kaempferol)、BS-11(Phenolic B)。其中發現BS-8 對神經膠腫瘤細胞株有18.42%之抑癌效果,另外,BS-2、BS-3、BS-5、BS-10、BS-11 等成分,呈現良好之美白作用。This investigation is to analyze Brasenia schreberi Gmel., a native rare floating water plant in Taiwan, focusing on the plant’ s structure, its growth environment and, most importantly, the effect of chemical compounds it produces on restraining the common pathogenic bacteria in human stomach. The result indicates that the most suitable growth environment for Brasenia schreberi Gmel. is in slightly acid, pollution-free water such as that in the lake Lung Pi in northern Taiwan. The ideal water depth for its growth is 50-160 cm, and the water temperature is 22-25°C. The impractical BS-1 (Gallic acid) extracted from the izome of Brasenia schreberi Gmel. by separation and purification has a light effect on restraining Staphylococcus aureus, a bacteria in the stomach. From the epidermis of the blade of Brasenia schreberi Gmel., ten other ingredients are also isolated, including BS-2 (Kaempferol-7-O-glucosids), BS-3 (Quercetin-7-O-glucosids), BS-4 (5,8,4’-Trihydroxyflavone-7-O-glucosids), BS-5 (3,5,8,3’,4’-Pentahydroxyflavone), BS-6 (Vitamin E: d-Tocopherol ), BS-7 ( Glyceride ), BS-8 (Phenolic A ), BS-9 (Quercetin), BS-10 (Kaempferol),and BS-11 (Phenolic B). BS-8 is found to resist cancer C6 ( Glioma ) by 18.42%, while BS-2,BS-3, BS-5, BS-10, and BS-11 show an outstanding effect on skin-whitening.

對抗無尺度流行病傳染之新方法

流行病的傳染過程如同一個無尺度網路,但較一般無尺度網路有著更多的變數而明顯差異,因此無法直接應用一般的無尺度網路模式來描述其傳染途徑。我建立一個新模式「無尺度流行病模式」,經由比較模擬結果與疾病管制局的數據,證實此「無尺度流行病模式」是正確與確切可用,且適用於短期暴發性傳染病與長期流行病。SARS案例研究結果,顯示影響SARS疾病傳染因子的大小是:ψ>m>γ。其中降低ψ值可使SARS確定病例至5月31日止降為143人(減少確定病例190人,相當於減少死亡21人);僅提高防疫使5=γ,亦可使確定病例減至307人(減少確定病例26人,相當於減少死亡3人)。因此強化隔離措施以減少傳染天數最為重要,且可以有效控制每日SARS新增病例,避免發生高侵襲率的現象。HIV/AIDS案例研究結果,獲知採用ψ值來進行月份模擬,則至 2005年12月HIV(+)與AIDS分別為可減少2,715與285人。而進行年度模擬結果,則至 2014年底HIV(+)與AIDS分別為可減少41,936與5,328人。無尺度流行病模式可以協助所需警戒的程度與政策決定的計畫結果。因此無尺度流行病模式在幫助政府評估社會經濟成本與健康憂慮上的有用之工具。當面臨一個全然無知的新病毒的侵襲時,如何減少死亡與傷害人數?是本研究之最終目的。因此,本研究結合了流行病、無尺度網路與灰預測,建立面對病毒侵襲,一個確切可行的對抗無尺度流行病傳染新方法,並詳細說明運作流程。\r \r \r The course of epidemic infections resembles a scale-free network. However, they are different due to more variables in the epidemic infection. Therefore, the model of scale-free networks is not enough to satisfy the reality epidemic infections. In this study, I propose a new the Scale-Free Epidemic Model. Comparison of the simulation results with Taiwan CDC report data for SARS and HIV/AIDS cases show that the Scale-Free Epidemic Model is accurate and useful. This model can be used in the short-term outbreak of infectious diseases and for the longer-term epidemics. In the SARS case study, the results show that the sequence of effect of the epidemic factors was: ψ>m>γ. The SARS confirmed cases would decrease to 143 cases (reduced 190 confirmed cases or 3 death cases) calculated to May 31, 2003, if the average infection time was reduced to two days (an optimum value of ψ). Therefore, vigorous action in isolation quarantine and treatment for SARS cases is most effective policy; the number of new cases and the attack rate would also decrease. In the HIV/AIDS case study, the simulation results of the Scale-Free Model indicates that the reduced numbers of HIV(+) and AIDS in the monthly simulation calculated to December 2005 are 2,310 and 361 and the annual simulation by December 2014 are 27,161 and 3,710. The Scale-Free Epidemic model can help determine the level of caution needed and the projected results of policy decisions. Therefore it is a useful tool in assisting the government to balance socio-economic and health concerns. The fight against a new epidemic and how to reduce the number of deaths is the main purpose of this study. So, a new method to fight against epidemics is proposed. Detailed procedures of this method are explained.

Wonderful Bubbles-不同立體框架與形成之肥皂膜的關係

如果將各種形狀不一的中空框架放入肥皂水中,框架上會結構出不同形式的\r 肥皂膜。本研究中包含了許多不同的實驗以探討各種常見錐體、柱體的肥皂膜形\r 狀,其邊數對肥皂膜面數的影響,及肥皂膜面積和模型邊長的比例關係。\r 第一部分的實驗中,我們探討不同的溶液、不同濃度對形成肥皂膜面數、模\r 式的影響;第二部分的實驗討論了n 角錐所形成的肥皂膜模式,並且得到其形成\r 的肥皂膜面數與角錐邊數n 存在著「肥皂膜面數= 3n - 3 」的關係;第三部分的實\r 驗討論了n 角柱所形成肥皂膜的模式,得到肥皂膜面數與柱體邊數n 存在著「肥\r 皂膜面數= 3n +1」的關係,其中三角柱為例外,一共只形成九面肥皂膜;第四部\r 分則討論了正八面體等其他形狀的模式;第五、第六部分的實驗則分析了肥皂膜\r 的大小與框架比例間的關係。

培地茅根系碎形維度及抗拉力

本研究首先確認培地茅根系具有碎形之基本特性,再進一步以方格覆蓋法計算之碎形維度來分析培地茅根系在不同時間及環境因素下的生長。主要探討碎形維度與抓地力之關係,並設計以實際根系模型來加以模擬,並發展出一可描述抓地力與碎形維度及深度關係的方程式。我們的結論為:(1) 經由方格覆蓋法之計算,培地茅此種植物,不管是整個根系或單枝根,均具有碎形基本特性,適合進一步實驗研究。(2) 碎形維度會隨著培地茅生長時間增長而增加,並且在自然光照及30℃左右會有較大值,而種植於土壤中根系發展較廣,其碎形維度比種植於沙耕中來的高。(3) 實驗結果顯示,抓地力受碎形維度及根系深度兩因素影響,而培地茅根系對土壤有較強的抓地力,推測是因為兩者根系皆又深又長,土中培地茅根碎形維度較大,接觸面積較廣,而又進一步以矽膠模型做實驗驗證。(4) 矽膠模型之目的在於減少難控制之自然變因,實驗之前,測量了根系模型與洋菜凍之基本性質,實驗結果顯示抓地力與碎形維度及根系深度皆呈正向關係,可用數學方程式加以描述。This project is mainly a research into the fractal dimension of the vetiver root system. First, we confirm the vetiver root system has the basic fractal structure by checking its self-similarity, then using box-counting method to calculate fractal dimension. We begin with a fundamental investigation into the relation between different time and environmental factors and fractal dimension. Then we move to our main point: the relation between fractal dimension and its pull-out resistance. In the next step, we make a fundamental silicon model, simulating the vetiver root system, to continue our experiments. In the end, we develop a formula that can describe the relation between its pull-out resistance, roots depth and fractal dimension. Here are our conclusions: (1) After using box-counting method to calculate fractal dimension, we discover that not only the whole vetiver root system but also a single vetiver root has the basic fractal structure. (2) Fractal dimension increases when time goes on. Also the value of fractal dimension is larger in natural sunlight and the temperature at about 30℃.The vetiver root system grows more widely in soil than those in sand. That’s why it has larger fractal dimension. (3) Data shows that its pull-out resistance is influenced by both fractal dimension and the depth of the roots. The vetiver roots, in the meantime, show greater pull-out resistance than some other plants. Thus we draw the assumption that the vetiver root system grows deep and wide, and in natural soil its fractural dimension is greater and reaches greater area. Therefore, a silicon model is constructed to further confirm the findings of the experiment.(4) The design of the silicon model is to reduce the uncontrollable variables in nature. Before starting the experiment, we measured some basic characteristics of the silicon model, including density and angle of repose. Furthermore, the experiment demonstrates that pull-out resistance and fractural dimension have a commensurate mutual relation: the stronger the pull-out resistance, the wider the fractural dimension and the deeper the root system. Thus we derive a math formula to describe this relation.

奈米碳管的成長機制與電性量測之研究

本實驗是控制奈米碳管的成長條件,研究奈米碳管的成長機制、電子場發射特性。奈米碳管的物理性質會因捲曲度(helicity)、管壁厚度(單層或多層)、管徑所影響,而不同的捲曲度,會形成不同電性(金屬性或半導體性)的奈米碳管。由此可知,探討奈米碳管的成長機制,以控制奈米碳管的穩定成長,及如何長出電性或光學性質相近的奈米碳管,是極為重要之事。為了研究奈米碳管的成長機制,我們使用微波電漿輔助化學氣相沈積法 (Microwave plasma ehanced chemical vapor deposition) ,在市售的縫衣針針尖上,成長奈米碳管,這個技術能夠經由吸收微波達到局部加熱針尖的方式,再透過控制微波功率、通入氣體的種類、壓力的變化以及催化劑的使用,能夠達到有效控制奈米碳管的成長條件。我們改變三個參數:催化劑的使用、氣體種類(Ar+CH4 或N2+CH4)及壓力,之後利用SEM 觀察奈米碳管的成長情形;再測量場發射(測量電性),討論不同成長的條件與場發射電流關係。