超聲波應用之研究
在實驗用共振法測量聲音在固體、液體、氣體中的駐波聲場,測量各介質中的聲速。研究超聲波在液體中的空腔效應,鋁箔在不同液體受空腔效應所破損面積與時間略成正比,並發現在水與各濃度的洗潔精水溶液中以水的破損效果最明顯。另外利用1.65MHz 高頻超聲波打入水中,因駐波使水有疏密不同產生狹縫,以雷射通過狹縫有光的繞射花紋產生,由干涉條紋可推估駐波波長。利用閃頻共振法研究光彈材料超聲波場,且發展出以肉眼觀測的裝置,由光彈材料的花紋級數與應力研究中,發現花紋級數與應力成正相關,由聲場中的花紋顏色判斷所受應力大小,並發現超聲波不僅有聲場產生並伴隨熱效應,會影響觀測花紋級數。This project began by studying the fundamental properties of acoustic waves, the relationship between its velocity, frequency and wavelength. Experiments regarding the distribution of sound waves in different mediums, and the induction of resonance in solid, liquid and gaseous materials were conducted. Results from utilizing suspending method to confirm theoretical prediction of sound velocity was accurate, and the sound wave patterns in photo-elastic materials were observed. It was also observed that an aluminum foil would be cut in an ultrasonic cleaning device. The effects of different liquids such as water and detergents on cleaning effectiveness were then experimentally determined, taking into account factors such as viscosity. From reference materials, we learned that ultrasonic waves would create Caritation in liquids. Traditionally, sound waves are expected to exhibit only longitudinal waves, yet in this study it was discovered that the residual\r stresses from resonance in photo-elastic materials also indicate the existence of transverse waves.
吃得多,較會生?不同食物量飼養對蓋斑鬥魚生殖行為之影響
自2004年4月29日至2004年8月30日止,研究不同食物量對於蓋斑鬥魚生殖表現之影響。自臺北縣水產種苗繁殖場取得40尾(北縣種苗場字第0930000192號),分成低、中、次高、與最高四個飼養食物量組(3, 6, 9 ,12 顆飼料/每隻魚),每一種食物量組進行四次重複實驗,每一個實驗箱飼養雌、雄魚一對,控制相同的光週期、溫度、密度等變因。結果顯示食物量為中食量組(6粒/隻)泡巢維持時間最長,與其他三組統計上有顯著差異,而其他生殖表現如雄魚的吐泡巢次數、泡巢間隔時間,以及雌魚產卵次數、產卵間隔時間,和魚卵孵化時間等四組之間皆無明顯差異。因此推測不同飼養食物量的處理對於蓋斑鬥魚生殖行為之影響不顯著。From April 29, 2004 to August 30, 2004, we studied the effects on breeding behavior of Macropodus opercularis in different quantities of food. We got forty fish from the nursery in Taipei County. We breed one male and one female in the tank, and the quantities food was set to low, middle, high, and highest groups (3, 6, 9, 12 granule forage per one fish). Every experiment group repeated three times. We also controlled the same light cycle, temperature, and density. We found that the longest maintenance time per one foam nest was breeding in middle group, and there is a statistically significant difference. But the other results had no statistically significant differences between different groups. Therefore, we inferred that the different allowance food feeding control had no significant effect to breeding behaviors of Macropodus opercularis.
猜牌術
This research mainly talks about how someone, by observing the non-congruent patterns on the backs of the playing cards and by working with the dealer on a pre-arranged lay out, can call out the cards as if he possessed the magic power to see through them. During the card-predicting game, one can use the patterns on the backs of the cards as visual clues (Observing whether it was places upside down or not)to help figure out the probability of where the card is going to show up. Suck a mathematical formula is known as the Pigeonhole Principle. Upon an analysis of the formula, we find that when given that the value of n is greater than 24, we can successfully call out a number of cards that is greater than 2n/3 . The possibility of such mathematical studies in other directions is endless. 中文摘要: 本研究主要探討利用橋牌非對稱的牌背,猜牌者經由和傳遞牌的人的一種事先約定的方 式(排法),彷彿(魔術)透視般的將一疊牌的花色逐步猜出。其猜牌過程是利用牌背 圖案的朝前朝後的指示,配合適當的猜牌張的分配,而運用到的數學法則包含鴿籠原 理,分析與討論歸納。最後我們得到一疊由四種花色張數相等所混合的n 張牌,可猜出 的張數恆大於 2n/3 (n>24 時)。後續可研究的方向仍然甚廣。