全國中小學科展

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臺灣

模擬複雜系統的演化

複雜系統廣泛地存在每個人生活的周遭,儘管這些系統在表象上有明顯的差異,卻不約而同的都呈現出臨界現象。一個簡單的物理概念卻能廣泛地使用在許多不同的場合當中,這是令人始料未及的。這份報告在尋找,是什麼原因導致這許多似乎與物理沒什麼關聯的系統,都呈現出臨界現象?以及這類系統是如何演化的?臨界現象在系統的演化歷史中,又是扮演怎樣的一個角色?一開始,先介紹臨界現象在實際系統中表現的形式,在這以文字系統作為範例。接下來,進入思考的階段,猜測系統個體間存有的關聯性,提出如何影響的假設,並建立模型。從模型結果,可以了解複雜系統隨時間演化的趨勢改變,並發現臨界現象在系統中扮演的角色以及代表的意義。這份報告有三項結論:1. 臨界現象在複雜系統中呈現的形式 2. 模型結果與實際系統十分相似 3. 臨界現象代表著系統的穩定態。The theory of Scaling Law and Universality was originally used in researching Critical phenomena, and now we find it existing in our normal life. A simple physical concept can be used extensively in different courses. This study try to find out the relation between individuals which causes Critical phenomena appear in such different courses in our normal life, and figure out the effect time brings about. To begin with, we introduce the sights of Scaling Law and Universality by exploring the formation of complicated system. Facing a complicated word system as a real example, we observe an extraordinary phenomena, and find out the Universality and Scaling Law in different kinds of linguistics. In the main part, to think further, what’s the relation between the individuals that leads to Critical phenomena? We will give hypotheses and build a model to simulate complicated system from the view of Universality, trying to find out the cause of the interaction of complicated system. From this model, we could understand: When a complicated system evolves with time, the Critical phenomena will naturally occur in this system that could be considered as dynamic equilibrium. From this study we found out(1) The Universality and Scaling Law in complicated systems, here we use linguistics as an example.(2) Under the hypotheses, the simulation is almost as same as the real result of linguistics system.(3) Time plays an important part in the Critical phenomena which can be found in many different complicated systems, and Critical phenomena symbolize a stable state of such systems.

紫蝶幻影

The main purpose of this experiment is to discuss the characteristics of iridescent colors of Taiwanese Euploea’s wings, inclusive of the relations between the colors of wings and squamas. According to the results from scanning electron microscope, we discovered that the iridescent colors had a close relation to nanostructure and arrangements of squamas. We inferred that both the nanostructure and the arrangements would influence the formation of iridescent colors and the basic colors on wings. In addition, the basic colors on wings are related to different types of scales. To compare with the diverse formations of different sorts of Taiwanese Euploea’s wings, we took SEM pictures of Elymnias hypermnestra as well, discovering that its iridescent colors had similar relation with scales. And there was the regulation that Elymnias hypermnestra had only one type of scales at iridescent area, and two different scales at not-iridescent area as well as Euploea’s. 本實驗目的為探討台灣地區紫斑蝶蝴蝶翅膀幻色的特性,以及翅膀幻色與鱗片的相關性。由結果得知,幻色實驗中利用掃描式電子顯微鏡發現紫斑蝶幻色的形成和其鱗片的細微結構與排列方式有密切相關。我們推論紫斑蝶的鱗片細微結構與排列皆會影響其幻色的形成,而顏色的不同則與不同類型的鱗片相關。除此之外,我們亦對同具幻色的紫蛇目碟進行拍照分析,發現其幻色亦與鱗片有相關性。紫蛇目蝶的幻色區具有單一種鱗片構成的規則性,非幻色區則有兩種鱗片,與紫斑蝶相同。

二維顆粒流體崩塌倒序現象之探討

本研究探討斜面上二維顆粒體流動的現象,分析各種變因(軌道盒傾斜角度、軌道盒側壁傾斜角度、軌道盒出口大小、顆粒粒徑)對斜面顆粒流性質的影響: 一、 顆粒流圖形與表層崩塌角 (一)顆粒流圖形: 「V字下滑」 (二)表層崩塌角: ‧正向關係: 軌道盒傾斜角 ‧負向關係: 軌道盒側壁傾斜角、粒徑 ‧ 未知關係: 出口大小 二、 中央線上目標顆粒的落下時間 ‧正向關係: 軌道盒側壁傾斜角度 ‧ 負向關係: 軌道盒傾斜角度、出口大小 ‧未知關係: 粒徑 三、 探討傾斜軌道盒顆粒流中,崩塌以及倒序區域分布圖形 ‧起始位置較高且較遠離中軸線的顆粒將可能發生「起始位置較高的顆粒卻較早落下」的倒序現象; 依照顆粒實際發生的崩塌類型,能將軌道盒分為穩定區、內崩塌區及表層崩塌區。 ‧崩塌區域的分佈受顆粒粒徑與軌道盒側壁傾斜角影響。

會旋轉的電解液

本研究主要探討電解液之帶電離子在磁場中的動力行為。為了觀察更細微的結果,共歷經三代裝置改良,第一代用五個電錶及探針測量徑向橫截面上五點的電壓,所測數值電壓有下降趨勢但不足以呈現細微部份的變化。第二代利用電壓感應線、搭配平移台及電腦,呈現連續性且經數位處理之結果,出現電壓升降的電荷堆積現象。第三代為了更精確,將裝置結構及器材上改良。觀察到在磁場作用下有旋轉現象,改變電極極性時,會有順逆時鐘方向的改變,且只有電解質液才會有旋轉。更可以使用帶電質點受到勞倫茲力F=q(VxB)理論解釋。且旋轉中的電解液比沒有旋轉時,析出的銅量少,反應溫度升高快,電解液內電壓分布因電荷堆積造成的高低起伏。經過改變磁場強度、電解液濃度,不銅價離子電解液,結果濃度大、磁場大、離子數較多者,呈現電壓分布圖快速變化,彎曲大。This thesis report is the study of combining the moving charged particles under the perpendicular magnetic field. By using the theory of moving and electrolysis, the electrolytic liquid will swirl through the particular arrangement of the horizontal cylinders enclosed in a circular enclosure container and strong magnet. Then, the researcher observes the force situation of the charge in the magnetic field and discusses the differences of the electrolysis effect, which is experimented under the different conditions, such as, in the magnetic field or no-magnetic field. Furthermore, the researchers discuss the conduction of voltage spreading and interfering when the moving electrons under different position of two electrodes and under the different interaction of electric field and the magnetic field. And the changing reason as follow: (1)the magnetic field strength. (2)the concentration of the electrolytic liquid. (3)electrolytic solution. When the experiment group compared with the comparison group, the result may provide fundamental understanding as follow:(1) The researchers can find out the charged particles rotating in the magnetic field. And it proved the moving condition when the moving electrons in the magnetic field. (2) This experiment can be used in judging the solution, which I electrolytes, or not. (3) This experiment also proved for Arrhenius’s ionic theory. (4) The researchers found out the quantity of Cuprun decrease, the rise in temperature and the reducing in voltage.

終端速度

液體中之球體運動與液體的黏滯性有關,本實驗找出球體半徑與終端速度之間的關係。利用攝錄機作為紀錄工具,拍攝三種材質(壓克力、玻璃、水晶)的球體在沙拉油中的自由落體過程。使用電腦影像處理軟體將影像分解成幅影像,時間的解析度為1/30秒。測量球體的高度與時間,分析高度與時間的變化情形,發現終端速度與球體半徑之間的關係。 流體中之運動方程Fdrag = -k1V,無法符合實驗結果。我們的實驗結果顯示油中的自由落體的運動方程應該是Fdrag = -(k1V+ k2V2)。由不同材質的壓克力球(~1.18g/cm3)、玻璃珠(~2.47g/cm3)與水晶球(~2.66g/cm3)所獲得的終端速度(Vt)與球體半徑(a)的關係為a3(ρ-ρ') = 0.00003(a Vt)2 + 0.00021(a Vt) + 0.00575,其中ρ與ρ'分別為球體密度與沙拉油密度(0.90 g/cm3)。 再者,在相同半徑的條件下,密度越大的球體終端速度越大,在靜止下落後,越久達到終端速度。 The motion of a sphere which is falling through a fluid is subject to the fluid viscosity. In this study, we find out the relation between the radius of a sphere and the terminal velocity. We used a digital camera to record the sphere's descent in the oil. The three kinds of sphere we choose are acrylic(~1.18g/cm3), glass (~2.47g/cm3)and crystal (~2.66g/cm3). Frame-by-frame analysis of the video footage yielded rough estimates of the sphere's location within 1/30 seconds accuracy for statistically consistent results. By measuring the location and time and analyzing them, we find out the relation between the radius of a sphere and the terminal velocity. The expression of the drag force,Fdrag = -k1V, is not cosistent with our results. The study indicates the expression of the drag force should be Fdrag = -(k1V+ k2V2). The expression for the terminal velocities of the three kinds of sphere is of the form:a3(ρ-ρ') = 0.00003(a Vt)2 + 0.00021(a Vt)+ 0.00575, where a is the radius, ρ is the sphere density and ρ' is the oil density(0.90 g/cm3). In addition, if the radius is the same, the terminal velocity of a denser sphere is higher and the time to approches the terminal velocity is longer.

「釘釘」是個人才─急速冷卻水之冰釘特性研究

揭開變化球的神秘面紗 --- 探討丘腦至前額葉的路徑連結

During the evolution of humankind, development of frontal cortex has played a critical role, where higher brain function like emotions, self-consciousness, decisions…etc, were all related to frontal cortex. On the other hand, thalamus is usually associated with relaying the sensory signals from peripheral receptors. In order to understand the functional role of frontal cortex, the signal processing mechanisms in the thalamo-frontal cortical pathway became an important research issue. The aim of this experiment was to find a method to dissect a brain slice that contains a connecting route in vitro between thalamus and frontal cortex with functional activity. Through nerve fibers tracking technique using fluorescent-dye (DiI), it was understood that the 3D-space connection between thalamus and frontal surface was an upward curve with a turn of about 110 degrees and bending inwards from the two sides. If a conventional horizontal section was performed, the route would be cut-off and its integrity lost regardless of the direction. To solve this problem, a novel section method was developed to retain the route. Based on the route direction shown by the fluorescent-dye, a piece of brain block was cut and flattened of about 110 degrees. Other sections were performed as control for studying the effectiveness of the sectioning on the plane of the route. Finally, electrophysiological methods were used to verify the connection route was complete and functional. Thalamus-evoked extracellular field potentials in the frontal cortex were observed by changing stimulation strength, adjusting slice temperature and prepared oxygen supply and administration of drugs like CNQX and picrotoxin in the 110 degree flattened slice but not the others. It was found that the reaction was essentially a neuronal response, indicating the pathway between thalamus and frontal surface was retained substantially. With this novel brain slice technique, we can assess the functional connection between thalamus and frontal cortex and investigate the cellular mechanisms of the signal processing in this connection pathway. It is anticipated that present technique provides an important step to further elucidate the functional role of the frontal cortex. 在人類的演化史上,前額葉的發展扮演了極為重要的角色,凡舉情緒、自我意識、決策等,皆與前額葉有關。而丘腦通常與視覺、聽覺及本體感受如痛覺、觸覺、溫度覺的訊息傳遞有關。要了解前額葉的功能,丘腦到前額葉的徑路及訊息處理機制,便成為一個很重要的研究課題。本實驗的目的是尋找一個方法能在離體的腦切片上維持具有丘腦到前額葉連結的徑路並且有功能的活性。經由螢光染料(DiI)神經束追蹤技術,了解從丘腦至前額葉路徑的三度空間連結為一先向下再向上約110度的角度轉折,並同時先由內向外再轉向內的曲線,若用一般水平之切片方法,無論何種方向,其路徑必定會被切斷,不能保持其完整性。為了解決此問題,發展出一種可以保存其路徑的腦切片方法。依照螢光染料所顯示出的的路徑走向,在腦塊的皮質上切一刻痕,將腦塊以110度的角度展平,使其路徑處在一個平面上再切片。最後利用電生理的方法來證明所切出的連結路徑是完整且具有活性。改變在丘腦的刺激強度、調整腦切片(腦脊髓液)溫度、氧氣的供給以及施予藥物CNQX、picrotoxin,觀察其前額葉之電位變化,發現其反應確實為神經反應,表示從丘腦至前額葉的路徑已在這種特殊的腦切片中被完整保存。藉由這個方法,將有助於研究丘腦至前額葉功能性連結,神經網路結構,及其訊息處理機制,並期待以這樣一個全新的方法將來有助於瞭解前額葉的功能。

Bezier曲線與蚶線間之關聯性的探討與推廣

在這篇報告中,我們以貝斯曲線的做圖原理建立出一種新的曲線-環狀貝斯曲線,進而得到不少有趣的結果。我們發現有名的古典曲線-蚶線,也是屬於二次環狀貝斯曲線。軌跡方程式為:,此時,係數恰符合二項式定理。之後我們推廣至n次環狀貝斯曲線的軌跡方程式:,也符合二項式定理。 在複數平面上,給定z0、z1、z2三點,我們定義出一個二次變換 ,若,,可映射成蚶線的圖形;若z∈實數,則可映射成拋物線。利用此結果類推我們找到一個複數平面上由 z0、z1、...、zn 所決定的n次變換將以原點為圓心的單位圓,映射成n次環狀Bezier曲線。 In this essay, we use the method of forming a Bezier Curve to establish a new curve, circular Bezier Curve, and find a lot of interesting results. We discover the famous classical curve "limacon", which belongs to the Quadratic Circular Bezier Curve. The locus of Quadratic Circular Bezier Curve is, where. Its coefficients match the binomial theorem. Then we apply it to the locus of nth-circular Bezier Curve:, and it also matches the binomial theorem.On the complex plane, we define a quadratic transformation corresponding to three points—z0,z1 and z2 as .If , where , a limacon is mapped. If z is a real number, a parabola is mapped. With this result, we will find a nth transformation defined by z0、z1、...、zn on the complex plane. It will form a nth-circular Bezier Curve with unit circle centering on the origin.

「游泳池救生員最佳設置位置問題」之探討及其延伸

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.