全國中小學科展

2013年

利用熱溶劑法製備鐵硒超導奈米片及特性之研究

本研究發展一套熱溶劑法合成鐵硒奈米超導體,並嘗試發展出新的元素摻雜方式。由此熱溶劑法所合成之鐵硒奈米超導體具有特殊的八邊形奈米片結構,除此之外更具有20K之超導臨界溫度。接著我們嘗試以吡啶溶液對奈米片進行插層的動作,雖然插層並不成功,但我們卻由此得知20K之超導臨界溫度是由鹼金屬的摻雜所促成。故我們調整熱溶劑法的反應環境,使得結晶與摻雜兩步驟在一反應系統中同時進行,透過此方法我們成功將更大量的鹼金屬摻雜至結構當中,且能以替換鹽類的方式來摻雜不同鹼金屬,由此方法所合成之鐵硒奈米片明顯具有比原先更高的超導臨界溫度,且仍保留原有的特殊八邊形結構。最後在改善量測的方式時我們更意外的發現較大的奈米片具有不同的物理性質,在磁性量測中約40K處有明顯的抗磁訊號產生,因此我們推測特殊的奈米片也有可能是影響超導臨界溫度的因素之一。而由於本研究在製成技術及樣品性質上皆有極令人耳目一新的突破,故可望在講求能源效率的今日有所貢獻。

水中的華爾滋

本實驗將小型塑膠圓片置於水中釋放模擬落葉的運動模式,發現圓片與水平之夾角呈現週期性變化,變化範圍會隨著時間改變。在運動幾個週期後,變化範圍會被限制,此時為穩定狀態。在水中加入鋁粉以觀察圓片運動時流場的變化,提出分流模型與最短時間原理,發現此模型可以解釋圓片的轉動機制。

大屯火山群磁場分布測量與分析

近年來許多研究顯示台北的大屯山底下可能存在岩漿庫,而最近一次的噴發可能約在5000年前,於是我們決定利用地球物理方法對大屯山做更進一步的了解。由於磁力測勘是了解火成岩區的重要工具,而且前人對大屯山的磁力探勘似乎著墨較少,所以我們決定使用磁力對大屯山進行測勘。測區包含了公路以及步道的部分,量取資料後,我們經過一些標準的程序得到磁力異常值,再利用極化修正將資料修正得更直觀,並用修正前後的資料繪出的圖與溫泉露頭、地表岩性等做比對。最後我們利用物理方法得到相對的居里點深度,希望能進一步了解大屯火山群的地熱活動。我們研究後認為:大屯山下方的居禮點深度較深,地熱活動較不活躍,而七星山到大油坑間的居禮點深度較淺,地熱活動則較旺盛,可能有岩漿庫存在。

整係數多項式裡有乾坤-平衡多項式

本文主要研究以數學方法探究物理上的平衡問題,將物理與數學的代數、數論、組合及幾何做了緊密的結合,並導出幾個有趣的結果。文中得出n的因數結構與平衡多項式的關係,以及平衡多項式與平衡問題一般解的關係,並進一步探討其平衡的排序策略及個數。再則將平衡多項式引入複數平面,可以看到許多有趣的幾何性質,並進而回歸至物理的應用。

妊娠禁忌中藥對斑馬魚胚胎發育之影響

本研究探討斑馬魚胚胎發育的不同時期,妊娠中藥對胚胎及仔魚的影響。在受精後第0小時(初期)、12小時(中期)或24小時(晚期)加入不高於人類用量的保產無憂方、當歸芍藥散與芎歸膠艾湯。每12小時觀察胚胎發育的情形;待仔魚孵化,比較其差異。結果顯示:(1)初期給予當歸芍藥散、芎歸膠艾湯不會造成胚胎死亡,但保產無憂方隨濃度增加而死亡率增加。(2)晚期給予保產無憂方,胚胎發育略有延遲,但全數存活,且劑量越高效果與控制組越相近。(3)三味藥均使發育延遲,尤以初期加入高劑量最為明顯。(4)中期或晚期給予安胎方皆造成仔魚體型縮短。(5)低劑量當歸芍藥散和芎歸膠艾湯使孵化後第四天仔魚運動總距離增加。我們建議,當歸芍藥散和芎歸膠艾湯在初期可用,但保產無憂方為胚胎發育後期之安胎順產藥劑,不適於早期之使用。

Injector Taster with Timing

1. Purpose of the research Implement injector tester and timer button in mechanical, electrical for Correct Use Hypothesis: if humans contribute to the contamination of unconsciously by technological convenience. Give solution with the same! 2. Procedures Needed human and material resources. Besides a ventilated area with excellent ventilation. Having basic knowledge of electricity and automobile electrical systems. 3. Data This device is intended total replacement bulbs and multimeters tests relating to auto injectors of this system is important since in automotive history have been looking for improvements, part of technological development and of necessity, be have been implemented in complex systems such as electronic fuel injection, but what if our system does not work properly? Humans would contribute to contamination of the ozone layer, this natural process accelerate global warming. Hey there a social problem today becomes a global problem. Here we can see that, sophisticated equipment, are of little technical solution with a higher cost. Not to mention that the technician who works on the vehicle: save time in making a diagnosis which will be successful. 4. Conclusions The solution: provide the necessary equipment that is available to countries that do not have low resource enough. Through a reliable and safe product for the sole purpose of showing that young researchers are able to provide improved technology in the automotive industry with no expectation of this project. You should use this factor as important in society: it is the technology for the environment thereby demonstrates the certainty of our hypothesis.

ORGANIC AND NON ORGANIC CEREALS The experimental pattern that marks the difference

1. Purpose of the research The purpose of this research is to make a suitable experimental pattern to distinguish, by scientific method, organic cereals from non organic cereals. The reference ideas consider cereals (rice, barley and maize) as a complex system that possesses its own chemical–physical properties. These cereals are able to maintain traces of the cultivation process. In non organic cereal grains foreign molecules, from synthesis substances used during their cultivation and/or in their final processing, can be found. These kinds of molecules would be absent in organic cereals. The effect of these foreign molecules traces on the principal components (glucides, proteins, lipids) of cereals is investigated by Infrared Spectroscopy (IR). 2. Procedures The spectra of a small quantity of cereal meal are recorded by the ATR (Attenuated Total Reflectance) sampling method. The meal is obtained from selected grains of rice and barley, that are grated near the germ. On the contrary, the maize grains, are cut lengthwise and the two halves are grated on the interior surface. This procedure of preparing samples, withdraws that part of the non organic cereal grains where foreign molecules are more abundant. The meal mass amounts to only a few milligrams; so in this way the dilution effect caused by starchy and proteinic parts onto the lipid part, is reduced. The cereal packaging has to be intact, well preserved and the expiry date has to be far–off. The organic packaging has the European Certification symbol and that of the authorizing agency. The cereals used in this research, have been labelled with symbols. The experimental data are processed by the NMC (Nearest Means Classification: J.Chem. Educ. 2003, 80, 542) method, adapted to cereals. 3. Data The NMC method is based on the individuation of suitable absorption bands of the IR spectrum and, for each of them, the calculation of the following quantities: the average value of the wave number (); the (Σ) value; the |diff.|=|(ῡ–)| value and the Σ|diff.| value. At the end the sum of the Σ|diff.| for all selected bands is computed in order to obtain the Σ(Σ|diff.|). Then a graph is plotted using (Σ) and Σ(Σ|diff.|) variables. The graph has a gap between the organic cereals and the non organic ones; in other words the organic cereals are found in a particular area, whilst the non organic cereals are found in another area. The boundary between the two areas is a particular value of the Σ(Σ|diff.|). This is the pattern that distinguishes organic cereals from non organic ones. 4. Conclusions For some cereals, the gap is bigger than others; but in any case the position of the cereals on one side of the boundary line or on the other, is clear. An experimental scientific pattern that marks the difference between organic cereals and non organic ones, can be useful to organic farms, authorizing agencies and consumers. This research has planned a route to find such a pattern.

A Zero Pollution Process That Convert Non-Biodegradable Plastic Waste Into Hydrocarbon Fuel

Non-biodegradable waste materials like discarded polybags, rubber bottles, broken buckets and sachet water bags constitute a serious environmental problem all over the world. Several steps have been taken to eliminate these waste materials. Burning of these non-biodegradable waste in an incineration only constitute environmental pollution as poisonous gases are release to the environment which are hazardous to lives. The purpose of developing this catalytic conversion of non-biodegradable waste material into fuel is to remove the problem non-biodegradable waste materials poses in its disposal as well as obtaining a precious end product that will supplement fuel supply. Dump side lands that would have been used for dumping waste is also reclaimed. The procedure and chemistry is from the fact that Non-biodegradable waste materials are composes of long chain hydrocarbon. Some are made of polymeric units like polythene. The materials are heated in a closed vessel with coal and a catalyst. Heating is done progressively until condensate from gaseous product is obtained. This condensate is wide range of liquid fuel (Diesel and petrol) including LPG ranges. Further separation processing will give pure product of the different fuel liquids. The Apparatus consist of a cylindrical cooking vessel heated by coal furnace or other heat source like LPG, the vessel is made of steal. The upper side of the vessel provide an outlet vent to connect condensing section/condenser which is required for the conversion of gaseous form of product into liquid state. The fuel produce can find it application in the following areas; Heating of kiln in the cement company, Heating of boilers and Domestic lighting.

暗「腸」玄機!-魚腸腸內菌的拮抗作用

我們從校園生態池吳郭魚的腸內挑選出二十二個菌落,並透過含1%碳酸鈣的MRS培養基篩出五株可產酸的細菌,藉由基因體定序並比對序列,我們確定篩到了四種不同的乳酸菌。分別為Streptococcus anginous MD1, Lactobacillus casei MD10, Lactococcus lactis MD14 和Enterococcus raffinosus MD18。經由培養基上的拮抗圈實驗,證實了此四株乳酸菌皆具有拮抗嗜水性產氣單胞菌(Aeromonas hydrophila) 的能力。實際將乳酸菌和嗜水性產氣單胞菌投餵到斑馬魚幼魚時,則以Streptococcus anginous MD1與Enterococcus raffinosus MD18有明顯的拮抗效果,其中Streptococcus anginous MD1對斑馬魚幼魚生長影響最小且拮抗效果最久。所以,我們認為Enterococcus raffinosus MD18在未來最有發展成生物製劑的潛力,可運用於魚苗存活率的提升,代替抗生素來對抗嗜水性產氣單胞菌(Aeromonas hydrophila)。

宜蘭外海條狀雨帶成因探討

觀察逐時雷達迴波圖之後,我們發現冬末春初時節,從傍晚到凌晨這段時間,在宜蘭外海是一條狀雨帶的「好發期」,這條狀雨帶並非由鋒面或其他已知的天氣系統引起,故我們想研究這條狀雨帶強度與其氣候環境間的關係。前人的研究中,並沒有研究宜蘭外海的條狀雨帶,不過,從其他研究類似的條狀雨帶的參考資料中,我們發現大部分的研究認定條狀雨帶的成因,都是由風場輻合所引起,因此,我們想研究是否還有其他促使條狀雨帶形成的原因。先定義出條狀雨帶常出現的範圍,挑出有出現條狀雨帶的時數,並利用軟體Extract Color擷取每ㄧ張圖片中條狀雨帶的像素,藉此將範圍中的回波訊號量化。整理向中央氣象局收集來的氣象資料(風向、風速、氣溫、海溫),與回波訊號的量化數據做對照。結果我們發現,以風的輻合輻散來看,當風的輻合量愈大時,此雨帶也愈明顯;以溫差來看,海溫與氣溫的溫差愈大,此雨帶愈明顯。