全國中小學科展

臺灣

明察秋毫-動態測微器

The purpose of this research is to create a device that is able to precisely measure small dynamic changes which cannot be recognized by the human eyes. The Vernier Caliper and the screw micrometer are common tools used to precisely measure lengths of objects. However, things which are measured by the Vernier Caliper or the screw micrometer have to be in a solid state, and the shape cannot be changed. By applying the light lever principle on Lego bricks, this research uses the LabVIEW graphical programming system to design a device which is able to automatically measure small dynamic changes. The precision of this device is higher than that of the Vernier Caliper and the screw micrometer. Moreover, this device is able to precisely detect the small dynamic changes of solids and liquids as well. Through numerous tests, the least count of the device can reach the level of 10-3cm. Also, this device has successfully measured small changes, such as the height of the liquid surface by one drop of water, the evaporation of water in one minute, and the growth of a plant in one hour. By popularizing this device, people will be able to precisely measure small dynamic changes which are difficult to be measured in a short time.

那些年,我們一起分解的氨氮-微生物處理廢水氮化物之探討

鑒於氨氮會消耗水中溶氧,造成水質惡化、危害水域生態,且政府將逐步管制廢水的氨氮含量,處理氨氮的技術日益重要。去除氨氮的方法有物理、化學及生物法,但物理、化學法成本高且有二次汙染的風險,因此本實驗希望找到能有效分解廢水中氨氮之菌種。採取可口可樂工廠的七池汙水,以高氨氮培養基篩出七種細菌(RW、ST、ET、BA、BS、SR、CA),並挑選出三種氨氮分解效率最佳的細菌(RW、ST、ET)。進一步發現其能有效降低廢水中氨氮,並減少氨氮廢水對水中動植物的危害。因此,我們認為RW、ST、ET能有效處理廢水中的氨氮並減緩氨氮對於環境的危害。

視覺中的光學現象

人眼所見點光源四週的光芒(我們稱為"星星長角"),夜間瞇眼時所見向上下方向射的特別長的光芒(我們稱之為"炫光萬丈"),這二種視覺中的光學現象無法用相機拍攝,但眼睛卻能夠看見。書上及網路上均無法找到合理的解釋。因此,我們設計了數個實驗來研究這些光學現象的成因。我們發現了星星長角的成因是由光對眼睛表面刮痕的繞射和光對眼睫毛的繞射雙重原因所產生。而炫光萬丈的成因則是光線經過眼球表面淚膜層的部分反射及部分折射所造成。The purpose of the research is to verify possible reasons of some optical phenomenon in human vision, including the star shape of a dot light source and glare upward or downward when one narrowing his/her eyes. These optical phenomenon can be seen by naked eyes but can not be taken photos with a camera. We find no detailed explains which can explain the cause of glare upward or downward on the internet or in books. So we designed several experiments trying to find out the cause of these optical phenomenon . In experiments, we figured out that diffractions by notches on the surface of eyes and eyelashes are both responsible for the star shape of a dot light source. The cause of glare when narrowing eyes is that partial reflection and partial refraction of light take place between boundary of air and tear film and boundary of tear film and cornea. The appearance of glare is closely related to the thickness of the tear film . When we narrow our eyes , the tear film is thicker. The thicker the tear film is ; the longer the glare is .Also, bended extent influence the length of glare. We figured out that the more bended the tear film is ; the longer the glare is.

關於渦旋〈二〉

在做這實驗之前,我花了很長一段時間思考一個問題:我如何能得到同\r 樣大小(均勻)的水珠陣列?我在家中各個角落放置許多水瓶,看看哪\r 個地方能培養出顆粒相同的水珠? 往往肉眼見到整齊排列的水珠,一經\r 顯微鏡觀察,可就大小不齊整了。\r 第一篇中的實驗,幾乎是「水珠日記」,記載冷凝過程;其中我特地比對\r 「穩定的水蒸氣氣流」與「擾動的水蒸氣氣流」、「水蒸氣氣流與凝結盤\r 間溫度差別」、「凝結盤密度差別」、「凝結因子的重量百分濃度差別」、「水\r 蒸氣氣流之流速差別」,並加以複合比對。希望能找到產生均勻排列的條\r 件–探討水分子的自我組裝機制(Self Mechanism of Water Droplets)。\r 這其中提出『均勻假說』: 當條件合宜時,冷凝下降的細微水珠會產生\r free vortex ring,形成整齊的渦環組合,進而產生均勻排列的細微水珠陣\r 列。\r 實驗是藉由溶液密度小於水的設計,讓水蒸氣冷凝於液面上,並且因密\r 度較大而下沉。設計的要點是:儘量減少細微水珠自冷凝後的堆疊\r (coalescence),以呈現水珠原貌。\r 在第二篇實驗中,將對渦旋比例尺修正。渦旋本身難測大小,在空氣中\r 也不易觀察,但是若由水中觀看,可藉由空氣蕊長短估算。這次更進一\r 步考慮到排水速率、水深、排水口形狀、與極值。\r \r I have tried to ask a famous math professor if he can create a formula\r describing the ordered array of water droplets。〝Then, I should study Physics\r first !〞He said。\r Condensation is the thing we live with , being found everywhere, passing\r without notice。But we never know0 when it does start?\r This experiment presented here is actually the diary of the growth of water\r droplets through condensation。Through convection and vortex ring, it\r discusses the self assembly mechanism of water droplets and peep into the\r uniformity of the size of water droplets。\r Here, vortex ring plays an important role in the self assembly mechanism of\r water droplets which is not triggered in the daily life。\r By coalescence, water droplets grow bigger, but are not round again。We used\r the polymer film as template and designed the solution lighter than water, so\r the minute droplets will sink to the bottom and layer by layer。After seconds\r we may have multilayers of ordered array。\r This is the first step in discovering the uniformity of water droplets, besides, I\r made some correction to the Vortex-Ruler。Vortex-Ruler will be useful in\r researching the flying mechanism of butterfly and dragonfly as to judge\r which one induces more vortices。

利用光合作用機制研發光電材料之研究

葉綠素為植物體內進行光合作用關鍵物質,在能源領域內也有不少的應用。葉綠素是光合作用的鑰匙,葉綠素能夠累積光的能量並放出激發態電子,利用激發態電子的能量進行一連串複雜的反應,本研究的理論就建立在光合作用上,利用葉綠素吸收光能轉為電能的特性開發新型光電池。光電池使用金屬或非金屬材料,照光後能產生電流之材料作為發電材料。電池的製作過程非常簡單,實驗發電材料葉綠素也很容易取得,完全沒有汙染環境的疑慮,是非常乾淨的綠色能源。另外也探討葉綠素濃度對於發電效能的影響。研究使用的裝置是由兩片玻璃與矽膠片組裝而成的電池,在電池中間加入葉綠素與電解液。藉由改變電解液與有無光照來探討葉綠素在該電池中的氧化還原作用是否有明顯的變化,並推出化學反應式。結果顯示在葉綠素與電解液的配合下能夠建立出一套循環產電系統。

蓮花自潔效應之成因機制

奈米科技是二十世紀末、二十一世紀初新興的科學技術,由於它是在1~100 nm(n = 10-9)的尺度內改造原子及分子排列,創造新物質【1】,將顛覆傳統改造物性,被預言將帶來人類的第四波工業革命,對物理、電子、光電、化工、材料、生醫、機電各領域帶來巨大衝擊。『蓮』是世界上最早的被子植物之一,在一億四千萬年前就生長在地球上,蓮的分布甚廣,從印度、中國、日本、北美到西伯利亞到處都有蓮的蹤跡。蓮的生命力強,很能適應環境,美國加州大學曾試驗培植古代蓮子,經過1300 年的沉睡,古代蓮子仍然正常發芽【2】。台灣的蓮花是十七世紀的移民,自中國帶來種植的。『奈米科技』和『蓮』這兩個不同年代的產物名詞如何連結在一起,他們怎樣相互依存;這正是本文討論的重點,也是了解『奈米科學』很好的例子。本文藉出汙泥而不染,闡述蓮花的自潔(self-cleaning)效應。一般在奈米技術中,簡稱『蓮花效應』【3】,包含清潔機制、成因;使用觀察紀錄自潔狀況情形,幫助對蓮花自潔過程的掌握。期望能對具有蓮花效應的奈米結構提供良好的意見。本研究的結果發現,蓮花效應強的植物,幾乎具有高抗水性。而抗水性是來自奈米結構和表層蠟質,這兩個特質也是蓮葉、芋頭葉等高蓮花效應的植物所具備的,所以我們推論:奈米結構和表層蠟質越發達,抗水性越好,則植物葉面的蓮花效應越強。Nano technology is one of the most advanced technologies now. Since it will alter and rearrange the fundamental structures of atoms and particles within the space of 1~100 nm (n=10-9) the coming industrial revolution depends on it. Nano technology will pose dramatic impact upon a variety of specific fields including physics, electronics, photon electronics, chemical industries and so on. Lotus is one of the most primitive covered-seed plants. It has existed since 140 million years ago and has spread in wide areas. The University of California made lotus seeds that have been frozen for 1300 years sprouted. The Taiwanese lotus seeds were transported from China in the 1600s. The researchers are to probe into the relationship between the nature of lotus and nanotechnology to understand the potential significance of this newly developed technology. The researcher employed the direct observation and tape recording to collect the objective data of the individual growth steps of lotus to analyze the self-cleaning effect of the lotus. In the conclusive part, the application of the Lotus Effect and the creative technology will be discussed and analyzed with the hope to prescribe both a conclusive experimental principles and a further direction for the manufacturing systems related to the developing Lotus Effect. The researchers of the study found that those plants, which have high quality of Lotus Effect, are given the nature of resisting water, which is the consequence of two features namely, the nano-structures and the surface wax. And the leaves of lotus, potato all have these two features. Therefore, it is inferred that the more efficient mechanism of the nano-structure and surface wax and Lotus Effects the plants are, the more effects of the water-resistance function will the plants achieve.

擋不住的「吸」飲力-新型吸管之研發

本研究首先製作「蔬菜紙吸管」,其耐水性及吸飲功能不佳,改以海藻膠製作吸管,經歷多次改良後的「第三代海藻膠吸管」其質地近似塑膠吸管,但吸飲功能仍然不佳。接著,以海藻膠為膠著劑;紅茶粉為骨材,成功製作出耐水性、吸飲功能較佳且可散發紅茶香氣的「紅茶吸管」。提高添加紅茶粉之比例,能有效提升吸管硬度,可應用在飲料封口膜之戳入,在冰水、熱水中均可長時間維持吸飲功能,製作大口徑「紅茶吸管」,可輕易吸飲波霸珍珠,徹底解決吸飲波霸珍珠之難題。自製擠出成型機械,可控制出料速度維持穩定,在滑軌上以直線移動,可製作出粗細一致且筆直的吸管,最後試製綠茶、咖啡、檸檬等調味吸管,均會飄出天然原料之香氣,頗具商品化之潛力。

枯木潛盾機──石氏煙管蝸牛 (Euphaedusa sheridani shihi Chang) 取食策略之研究

When one time we beautified our campus. It made us meet the snails, Euphaedusa sheridani shihi Chang, unexpectedly. Maybe snails make people associate with the holes on vegetables tops in thinking. Do all of the snails make vegetables tops as their food? We compared with the weight of the wood which has been stayed by snails or not. After a week, the weight of the wood which has been stayed by E. sheridani shihi Chang decreased obviously. It showed they also make wood as their food. What do they decompose wood become? First, we used the basic Carbohydrate's detection means to test the eluate of the wood which has been stayed by E. sheridani shihi Chang. However, we found both the eluate of the wood which has been stayed by E. sheridani shihi Chang or not can examine the Pentose out. So next, we plan to use SDS-PAGE to analyze the left enzyme on the wood, and use it to prove whether they secrete enzyme in mouth to decomposed wood or not. In addition, the holes these snails made and the environment are connected. By means of changing light, temperature and humidity to experiment with how much wood can these snails decompose. We found in the dark, about 20℃ and moist environment, they could decompose the wood the most. Finally, the holes they made on the wood also have its ecological niche. They decomposed the wood not only hastened the dissolution of the wood, but also provided the microhabitat for alga, fungi and small bugs.一次綠化校園的活動,製造了我們與石氏煙管蝸牛的邂逅。蝸牛,或許使很多人想到蔬菜上的洞,但真的所有的蝸牛都以蔬菜為食嗎?比對有無蝸牛棲息的兩組木頭,結果一星期之後有蝸牛棲息的木頭重量明顯減少,顯示蝸牛也以木頭為食。那麼牠們把木頭分解成什麼呢?我們先以基本的醣類檢測方法,檢測蝸牛棲息過的木頭表面洗出液,不過發現不管有無蝸牛棲息皆可檢驗出五碳醣,接著預計用SDS 膠體電泳看是否可以分離分析出蝸牛在消化木頭時殘留在木頭上的酵素,以證明蝸牛是否在口腔分泌酵素以分解木頭。至於環境和蝸牛消化木頭的關係,我們藉著改變光線、溫度、溼度等變因進行實驗,發現牠們在陰暗、潮濕、約20℃的環境下可以分解最多的木頭。最後,牠們分解木頭形成的洞也具有其生態意義,不僅加速木頭的分解,也製造了微棲地提供藻類、真菌及小型生物的生存空間。

布洛卡點相關性質探討

本文我從文獻已有的布洛卡三角形及其三種變換出發作各種推廣。首先將布洛卡點在三角形內的情形推廣至多邊形,發現並非任意多邊形皆存在布洛卡點。我發現了存在布洛卡點的充要條件,及布洛卡角、邊、面積的關係式。然後探討四邊形的情形,發現存在正、負布洛卡點的四邊形皆為調和四邊形。接著將文獻中三種布洛卡三角形的變換整併為更具數學風味的旋轉與伸縮變換。再以此方法為基礎,發現一系列布洛卡點、外心間的幾何性質,同時進一步推廣至多邊形,其中美妙的結果是:從任意布洛卡n邊形出發的n條全等的等角螺線皆會收斂至布洛卡點;最後,本文最驚艷的發現是:所有存在正、負布洛卡點的n邊形,其頂點皆為正n邊形的頂點經過反演後的反形。

獵能系統與整流天線(Energy harvesting with rectenna system)

從資訊革命後,為了使資訊更快速地傳遞,無線電波已成為我們生活上無法割捨的一部分。無論身處何處,我們日常生活已被無線區域網路(WLAN)、廣播以及蜂巢式行動通信基地台(Cell site),甚至包括變壓器和日光燈管等所釋放各種各式波段及能量的無線電波包圍,但由於這些電波並非無時無刻地在通訊,以及基地台並非隨時都處於高負載狀態,加上其服務對象可能僅處於基地台覆蓋範圍之某一區域,因此無法被完全地利用,而損失了需多能量。有鑑於此,我們希望設計一組結合天線及整流器之整流天線(Rectenna -rectifying antenna)為主體之獵能系統(Energy Harvesting System),以環境中的電磁波訊號作為我們獵能的目標,收集未被利用之電波後轉換為直流電(DC)。目前實驗初步成果對於環境中之無線電獵能平均電壓可達474毫伏,最高峰可達1330毫伏。未來可應用於擁有低功耗特點之物聯網(IOT)裝置上,在顧及環保節能的同時,達到自我供電的目的。