全國中小學科展

一等獎

宇宙演化的黑手

We study the effect of dark energy on the evolution of cosmic structure in a scenario where the dark energy is treated as free particles and thus can be localized. By theoretical derivation and numerical simulations, we found that: 1. The dark energy particles gain kinetic energy from a moving dark matter particle through gravitational interaction. Due to energy conservation, the dark matter particle will slow down with time Ek(t) = Ek0 - 9 × 10-5[|1+3w|ρDE]1.92t where Ek(t) is the kinetic energy of the dark matter particle,Ek0 is its initial kinetic energy, w is the coefficient of equation of state for dark energy, ρDE is the mean energy density of dark energy, and t is the time. 2. The formation history and structure of galaxy clusters are different in the presence of localized dark energy. The more the localized dark energy, the earlier the formation of the cluster core. In addition, the kinetic energy Ek(R) as a function of R will be different if the ρDE is different. Thus we can compare the observed Ek(R) of clusters with our results to deduce the ρDE in our universe. The results here can be applied to the observations in the near future. 我們探討宇宙結構演化受到可局部叢集之黑暗能量粒子的影響。藉由理論推導及電腦模擬,我們發現: 一、黑暗能量粒子會透過重力交互作而從運動中的黑暗物質粒子獲得力學能。因力學能守恆,黑暗物質粒子的速率會減慢,滿足 Ek(t) = Ek0 - 9 × 10-5[|1+3w|ρDE]1.92t 其中Ek(t) 為黑暗物質粒子的動能,Ek0 為其初始動能,w 為狀態方程式係數,ρDE 為黑暗能量的平均密度,t 為時間。 二、星系團的形成過程及結構,會因可局部叢集之黑暗能量的存在而改變。黑暗能量越多時,星系團的核心會越早形成。而且動能 Ek(R) 隨著至星系中心距離R 的變化,會因 ρDE 的不同而不同,因此可以將量測到的 Ek(R) 和這裡的結果比對,推導出宇宙中的 ρDE 。 這些研究成果將可直接應用在未來的觀測結果上。

「渦」藏「聖」機--以渦流脫離重新詮釋聖嬰發生的原因

If we place a block in continuous, steadily flowing water, some periodic eddy currents will appear behind it. In my report, I would like to introduce a new way to explain how the periodical movement of eddy currents would help to triggering El Nino. According to my experiment, these eddy currents have a certain life cycle, and the eddy current give a force, which drag water form the area they just went by. It will cause water level became lowest for a period of time. These phenomena are also shown in the real data of “Sea Surface Height Anomaly”, it is a quiescence period, and then changes into the highest one it is interesting that highest one always follows by the starting of El Nino. Another important result from my experiment is that, in the same fluid, the frequency of eddy currents is controlled by 2 variables: Size of the block and velocity of the flow, From this result, then get the frequency of eddy current-occur every 3.2 years. It is just correspond with frequency of historical data the El Nino from the 70’s to the present. 本報告嘗試以南極繞極環流在南美洲南端產生週期性渦流脫離的現象來解釋聖嬰的發生根據水槽實驗的結果,水流在通過障礙物後渦流脫離瞬間,會形成一水位低的空區,之後在周圍的水大量湧入,水位突然升高,並有一段時間的振盪。另外,實驗結果也顯示,渦流形成和脫離頻率大致上和注水流速成正比,且和障礙物的大小成反比。根據此結果,對照實驗結果,我認為1993 年3-4 月,1996 年1-6 月及2001 年7-10 月三個「海平面高度異常」的最低值密集帶,此極可能是渦流脫離的時段。且對照「海平面高度異常」實際資料後,發現「海平面高度異常」的「最低值密集帶」後均伴隨水面「寧靜期」,接著就出現周圍暖水流大量湧入的「最高值密集帶」,此時南美洲東南側海水溫度驟增,接著馬上接續著聖嬰的到來。「海平面高度異常」分析的結果,指示渦流脫離的「最低值密集帶」和顯示著聖嬰到來的「最高密值密集帶」間約間隔半年左右。我們推算水的史托爾數約為1,以這個值代入實際南極繞極環流通過南美洲南端,得到渦流脫離的頻率約每3.2 年一次,和長期聖嬰發生的平均頻率非常接近。

星系團照妖鏡

我們藉由電腦模擬來研究宇宙微波背景輻射中之Sunyaev-Zel’dovich 效應,以探討星系團及宇宙的一些根本性質。重要的發現有: 以上的結果,將可在短期的未來直接應用在許多期待中的觀測結果上,以揭開星團的總質量、質量密度、以及宇宙中的黑暗能量等神祕面紗。 We study the important properties of the galaxy clusters and our universe by using numerical simulations for the Sunyaev-Zel’dovich effect in the Cosmic Microwave Background. We found that: These results can be applied to the observations in the near future, in order to reveal the total mass of clusters, their mass density profile, and the dark energy of our universe.

YWHAZ(14-3-3ζ)蛋白在肺腺癌細胞中可能活化Wnt路徑之探討

YWHAZ(14-3-3δ)蛋白被證實在肺腺癌中會引發上皮-間葉的轉變作用(epithelial - mesenchymal transition ; EMT)導致癌轉移,然而其分子機制卻不清楚。先前實驗室利用cDNA微陣列技術(microarray)發現肺腺癌細胞大量表現YWHAZ蛋白會導致Wnt訊息傳遞路徑之相關基因大量表現。因此,本研究目的是探討YWHAZ蛋白在肺腺癌細胞中是否會活化Wnt途徑而引發EMT。\r 本研究結果發現大量表現YWHAZ蛋白除了會增加細胞質中β-catenin的表現量,也會增加細胞核內 β-catenin 和TCF4 的蛋白表現量,並且在細胞核中與β-catenin和TCF4形成複合體;而臨床肺腺癌病患檢體中發現,相較於正常肺葉組織,YWHAZ蛋白與β-catenin在肺癌組織的檢體有較高的表現量,同時少部分會進入細胞核內。經由以上結果,我們推測YWHAZ蛋白可能會結合β-catenin與TCF4蛋白並活化Wnt途徑,因而引發EMT之產生,而促進肺癌轉移。說明YHWAZ蛋白有潛力成為日後診斷肺腺癌的指標蛋白(marker protein),同時亦成為治療肺腺癌的標的蛋白(target protein)。\r 重要性\r 1.提出YWHAZ可能在肺腺癌細胞中活化Wnt訊息傳遞路徑(Wnt signaling pathway)而導致癌轉移。\r 2.再度指出YWHAZ在腫瘤生物學的重要性。\r 3.對於肺腺癌轉移提供了臨床診斷及治療的另一種選擇 ─ YWHAZ。

瓦斯熱水爐一氧化碳觸媒轉化器之研究

瓦斯熱水爐使用大火時廢氣的CO 濃度非常高是導致一氧化碳中毒事件的關鍵原因,要解決這個問題觸媒轉化是一種可行的方式。影響觸媒性能的因素中以活性中心的種類最為重要,我們發現對轉化一氧化碳為二氧化碳的反應而言鈷有最好的催化效果,其次分別為:鎳、銅、鐵。最好的載體是三氧化二鋁,鈷的含量使用10%,煅燒溫度使用300℃可兼顧性能與成本。 本研究中所研發的 Co/Al2O3 觸媒具備有實用的潛力,可以在空間速度高達1000min-1 的情況下將濃度14,632ppm 的CO 百分之百轉化為CO2,而僅需233℃的反應溫度。因此,應該可以應用在瓦斯熱水爐上以降低一氧化碳中毒的風險。 The incorrect usage of a natural gas powered water heater always generates high carbon monoxide concentration in a closed environment. The dangerous CO gas can be fatal to the careless user of the water heater. Catalytic conversion of CO to CO2 can be a convenient method to solve this problem. The effect of the support, the supported metal, loading of the metal, reaction temperature, gas concentration, and reactants flow rate on the performance of the CO oxidation catalysts have been investigated. X-ray diffraction, gas adsorption and Infrared spectroscopy were applied to study the characteristics of catalysts. A 100% conversion of CO to CO2 can be achieved when 1.46% CO/6% oxygen/N2 reactants was catalyzed by a 10% Co/Al2O3 catalyst at 233℃ with a space velocity of 1000min-1 . This reaction condition is sufficient to remove the entire CO generated by a family-sized natural gas water heater.

推著離子跑

在本次實驗中,我們發現溶液中的帶電離子,會因為離子團的熱運動,和電偶極的庫倫吸引力(electric dipole)的交互作用下,使得電解質溶液的I-V curve(電流-電壓 曲線),具有類似磁滯曲線(Hysteresis curve)的效果,同時我們運用光學干涉的原理,證實此時在電場作用下,離子團會互相順著電場方向作條列鍵結,而加熱實驗也證實,熱運動會使溶液的I-V curve(電流-電壓 曲線)變的不一樣。另一方面,我們也發現,在給予電解質溶液一外加的衝擊電壓時,該溶液的電荷分布,?會因為彼此的互相擠壓以及自由擴散的作用下,而形成一震盪分布,其所顯現出來的,則是電壓的震盪變化。最後由於震盪波紋的變化,在起始時與中段之後有著明顯差異,我們對此變化提出看法和證實,相信內容是精采可期的! In this experiment, with the interaction of the heating action of ionic atmosphere and electric dipole, we find that ionic in the liquor makes the I-V curve in the electrolyte liquor show up with the effect similar to Hysteresis curve. Meanwhile, we practice the principle of interference to prove that at this moment, under the influence of electric field, ionic atmosphere will connect to each other in line following the direction of the electric field. It is also proven that in the heating experiment, heating action will make I-V curve in the liquor different.On the other hand, we also find with extra electric impact, the charge distribution of the liquor will form a oscillation, that is, the changes of the voltage oscillation under the inter-collision and the free spread. We offer our viewpoints and proofs about the obvious changes of oscillation wave in their beginning stage and after their middle stage. We believe that the marvelous content is surely worth of your expectation.

你在看哪裡--蝌蚪眼睛位置及其視野之研究

陸域草食性動物的眼居於頭兩側,有較寬的單眼視野以便於逃避攻擊;而肉食性動物的眼居於頭前方,立體視覺較佳,有較好的距離感以捕捉獵物。我們利用Geogebra軟體分析台灣33種蝌蚪頭部影像資料,定位出每種蝌蚪眼睛的相對位置,並以數學幾何方式描繪眼睛的視野範圍。 我們發現蝌蚪眼睛位置可依兩眼距離分為“側位”(23%)、“背側位”(67%)及“背位”(10%) 三種型態。側位兩眼距較大,背位兩眼距較小。蝌蚪眼睛視野則可分為“前視型”(42%)及“側視型”(58%) 二種型態,前視型雙眼視覺區較大,側視型視野範圍較廣。我們將眼睛位置與視野範圍的數據與蝌蚪的棲息環境、食性種類及演化分類等進行相關分析,結果發現:1.眼睛位置與棲息環境有相關,棲息越接近水面,為「側位」;棲息越接近水底或是密閉空間,為「背位」。2.視野範圍與食性種類有相關, 肉食性蝌蚪雙眼視覺角度較大,濾食性整體視野較廣。3.眼睛型態與物種演化關係大部分相符合,同一屬且生態棲位相似者,蝌蚪眼睛型態會相似,如台灣狹口蛙科Microhyla屬4種蝌蚪都是側位型;樹蛙科Kurixalus屬的3種蝌蚪都是背位型;但有些例外,如面天樹蛙眼位與同屬艾氏樹蛙不同,可能與生態棲位不同,而演化成不同的眼位有關。

魔術猜牌-由再生訊息延伸推展猜中比值之研究

本研究是藉由數學手法探討;如何由一疊 36 張四種花色的撲克牌中,尋找出保證可猜中最多張花色的方法。研究過程是以在適當的猜牌時機,以邏輯推理、二進位、分析與歸納 … … 等數學原理與方法,搭配巧妙的策略運用而達到目的。 猜牌方法:先約定好猜牌規則,助手將 36 張牌背圖樣相同但非對稱的撲克牌,以旋轉牌背的方向傳達訊息。在本研究中得出「經由巧妙的猜牌方法保證可以猜中不少於 26 張花色」,並得出「當總張數趨近於無窮大時,保證可以猜中不少於 81 . 07 %的牌,並且證出若僅使用獨立的訊息猜牌,無論任何猜牌方法皆無法猜中多於 87 . 37 %的牌」 · 其中一個猜中多於 80 %的例子是‘「當總張數等於 23006 張時,保證可以猜中不少於 1 8405 張牌(18405/23006 > 4/5)」 ·The study is mathematically based with reasonable explanations behind it. We are to correctly guess as many cards as possible from a deck of 36 cards, with random numbers and four different suits. We will apply mathematical methods, such as logic inference, binary system, and analytical reduction, upon right timing. Using careful arrangement of the principles and reasoning, we can reach our ultimate goal. To state guessing: Conference between the guesser and the assistant about the guessing rules, the assistant will have 36 cards with the same exact pattern on the back but not symmetrical. The pattern of the cards will be different when rotated 180o. The only communication between the two is by rotating cards. In this study, we can prove that through mathematical method, we can assure 26 or more cards can be correctly guessed. Furthermore, when the total amount of cards is close to infinity, we can assure 81.07% or more of the cards can be correctly guessed, and prove that if the cards are guessed from independent information, no more than 87.37% of the cards will be correctly guessed by any guessing methods. One of the examples, which 80% of the cards are correctly guessed, is that when the amount of the cards is 23006, 18405 or more of the cards can be correctly guessed. (18405/23006 > 4/5)

竹嵌紋病毒及其衛星核酸5'端非轉譯區與複製競爭關係之探討

RNA 病毒在複製過程中容易產生錯誤,導致其族群具中有很大的遺傳歧異度,累積的錯誤再加上選汰的壓力造成往後之變異。由於RNA 基因體之病毒變異較大,使得RNA 病毒在單一寄主上具有quasispecies 的特性,提供病毒產生新基因體的機會以適應環境或演化成新病毒。例如流行性感冒病毒與之前造成恐慌的嚴重急性呼吸道症候群病毒(severe acute respiratorysyndrome,SARS)以及禽流感病毒 (avain influenza virus) 皆為RNA 病毒,意味著RNA 病毒知不穩定性,並容易造成一些目前我們無法及時反應的危害。大部分的植物病毒又為RNA 病毒,本研究將以竹嵌紋病毒 ( Bamboo mosaic virus , BaMV )及其衛星核酸 (satellite RNA, satBaMV)為材料,進一步探討核?酸序列之變異對其族群在複製競爭上的影響。

『凍』人心『鹹』,『黃』金Style~以冷凍凝膠法創作速成鹹蛋黃之新『蛋』生

蛋黃酥所使用鹹蛋黃來自於鴨蛋鹽漬而成,取出鹹蛋黃剩餘之蛋白因鹽度高,無法再利用只能拋棄相當不環保,本實驗利用將蛋冷凍再解凍以分離出蛋白及蛋黃,蛋白可加工再利用,凝膠蛋黃則可鹽漬成鹹蛋黃。結果發現蛋黃在-18℃冷凍3天可完全凝膠,以30%食鹽水鹽漬40-60分鐘,其鹽度已與市售鹹蛋黃相當。在喜好性感官品評發現,鹹味、口感及整體喜好性均與傳統鹹蛋黃相似。解凍蛋白製成蛋糕在喜好性感官品評發現,色澤及口感評分最高優於新鮮蛋白,在香味及整體喜好性則與新鮮蛋白無差異。速成鹹蛋黃僅須1/10生產時間且蛋白可回收再利用並減少鹹蛋白廢棄物。