搜尋結果
查詢
the共找到
1536筆。
如查無相關資訊,可至
進階搜尋
進行查詢
科展作品檢索
含環胺-亞胺雙牙配基及其鎳錯合物的合成、結構鑑定,及烯烴催化聚合反應
本研究合成含環形胺—亞胺雙牙配基鎳金屬催化劑,用以催化烯烴聚合反應。將2-甲基丙醛經由溴化、胺化及亞胺化的步驟合成含胺—亞胺的雙牙配基,Et2NCMe2CH=N(2,6-iPr2C6H3) (3a)、(c-C4H8)N- CMe2CH=NPh (3b)、RNCMe2CH=N(2,6-Me2C6H3) (R = c-C4H8 3c,c-C5H10 3d)。再將配基和Ni(DME)Br2 (DME = 1,2- 二甲烷氧基乙烷) 反應, 形成鎳金屬錯合物Ni [Et2NCMe2CH=N(2,6-iPr2C6H3)]Br2 (4a)、Ni[RNCMe2CH=N (2,6-Me2C6H3)]Br2 (R = c-C4H8 4c,c-C5H10 4d),並作結構鑑定。其中3b、3c、3d、4c、4d 均為合成的新化合物,4d 獲得X 光單晶繞射結構。
以合成之鎳錯合物作為催化劑,催化乙烯或降冰片烯(C7H10)的聚合反應,探討反應活性和高分子產物的性質。與含相同碳數的錯合物比較,在胺基具環形取代基的錯合物對乙烯的催化活性較佳,聚乙烯產物分子量較高,分子量分布範圍狹窄;其對降冰片烯的催化活性略遜於非環形者。同為環形取代基時,六環較五環者對乙烯的催化活性較差,但對降冰片烯的催化活性較佳。顯示乙烯聚合與降冰片烯聚合有不同的反應決定步驟。催化劑及配基的設計的確可以操控聚合反應及其高分子產物的性質。
The synthesis of α-amino aldeimines Et2NCMe2CH=N(2,6-iPr2C6H3) (3a), (c-C4H8)NC Me2CH=NPh (3b), RNCMe2CH=N(2,6-Me2C6H3) (R = c-C4H8 3c,c-C5H10 3d), as well as the nickel complexes Ni [Et2NCMe2C- H=N(2,6-iPr2C6H3)]Br2 (4a), Ni[RNCMe2CH=N (2,6-Me2C6H3)]Br2 (R = c-C4H8 4c,c-C5H10 4d) has been succeeded. Their structures were mainly determi ned by spectroscopy or elemental analysis. The complex 4d was characterized by X-ray crysta llographic analysis. It shows that the nickel complex has distorted tetrahedral configuration.
The catalytic reactions of ethylene or norbornene polymerization using the newly synthesized nickel complexes are studied. All catalyts show high activity toward studied olefin polymerization. Comparing the data of the catalytic ethylene polymerization for complex 4c with those of its isomer complex 4a, the former is found to results in higher activity as well as the larger molecular weight of the PE products with the narrower dispersity. On the contrary, 4c shows lower activity in the reactions of norbornene polymerization than 4a. For the cyclic amine derivatives, 4c of five-membered amino group shows better catalytic activity toward ethylene polymerization than 4d of six-membered amino group. But 4d gives better perfomance for norbornene polymerization than 4c. Such results indicate that the processes of ethylene and norbornene polymerization might have different rate-determining steps. These study confirms that the design of ligand and catalyst are crucial with respect to the control of the catalytic olefin polymerization and the properties of the polymeric products.
> 更多
本研究利用麥克風與相關電腦設備,結合成自製頻譜儀用以觀測多種情況下蜜蜂的聲音頻率。若將蜜蜂的翅膀加以修剪,可測得有不同的頻率,解析頻率發現「翅膀為主要發聲點,但去除翅膀仍有高頻的發聲,且有三種不同的頻率。」將蜜蜂置於不同溫度下,解析頻率得知「一定溫度範圍內,溫度越高蜜蜂發聲頻率越高,反之亦然。」幼期在胸部塗顏料使絨毛無法生長,去除雙翅後,仍有頻率相近的發聲,得知「胸部絨毛不是造成高頻的原因。」靜置5分鐘,待蜜蜂停止發聲後,剪去腳、挑弄蜜蜂會發出高頻,得知「情緒是引起高頻的原因。」將蜜蜂的翅膀加以修剪,分別放回蜂窩口,發現「同一族群蜜蜂可用發聲頻率來辨別同伴。」比較義大利蜂及中華蜜蜂,得知「在多種情況下中華蜜蜂發聲頻率皆較義大利蜂高約70Hz。」因此本實驗之結論並不受蜂種影響。The study, capitalizing on a hand-made frequency divider, the microphone and computerized equipment, observes a variety of frequency of sound given off by bees. We read different frequencies from the apparatus when the bee’s wings were trimmed. Analyzing it, we discover that the bee’s winds are major source of its sound, but it still gives out high-frequency sound when the wings were completely cut off.” After analyzing the frequency, we discover that within a certain temperature range the higher the temperature is, the higher the frequency is, and vice versa. In one experiment, we painted the thorax at its pupal stage to stop the bee from growing fine hairs. Even though the wings had been removed, it still gave out high-frequency sound. We, therefore, conclude that fine hairs on the thorax have nothing to do with the making of the sound. In another experiment, bees were placed in an undisturbed environment until they are completely silent. Then, some of the bee’s legs were cut off, while others were provoked. And all the bees make high-frequency sound in the process. We make a hypothesis that emotion could be the cause of bees’ sound-making. The bees with different trimmed wings were put back to the beehive; the bees can still recognize one another by the different sound frequencies. If we compare A. m. ligustica with A. c. cerana under different conditions, we find that the frequency from the latter is about 70 Hz higher than that form the former.
> 更多
科展作品檢索
這不是群體防禦─反駁行為學家對魚群行為的高估
This study is to discuss the reason that interfere the fish schooling behavior " adult fish surround the young fish ". I use mathematic simulation, to observe the result when the fishes are stimulated, due to the body size , the speed of swimming , the difference of sensitivity will make different reaction. We predict the motion dots of fish when the hunter appears on the block paper, then analyzes the motion of adult fish and young fish in dot to determine if the result remind "adult fish surround the young fish "structure. The conclusion shown that natural reaction physiologically on fish will show "Adult fish surround the young fish "results, so, the factor that interfere the structure of fish group is not so called "group defense by ethnologist".本研究目的,在探討影響魚群「成魚圍繞著幼魚游」的行為。本研究是以數學模擬法,依觀察結果,設定魚在受到刺激後,因體型大小、游速的快慢、靈敏度的差異等,所產生的不同的反應。再在方格紙上模擬魚群在捕食者出現時,游開的動線。最後分析成魚幼魚的動線分布情形,是否仍是「成魚游在幼魚外圍」的魚群結構。研究結果發現,依魚類的生理條件所設定的條件下模擬,自然形成「成魚游在幼魚外圍」的魚群結構。所以,影響魚群結構的因素,的確不是行為學家所說的防禦行為。
> 更多
科展作品檢索
台北市內湖區金面山地衣調查與空氣污染對地衣影響之探究
本研究工作自2001 年7 月至2002 年6 月止,在臺北市內湖區金面山進行地衣實地探勘採集調查,以位於臺北市內湖區之麗山高級中學之校園為中心點,範圍由校園金面山至學校前門所面對的港墘路與環山路口。應用「外部型態比較」,「切片觀察(徒手切片技術)」與「化學分析(薄層色層分析Thin Layer Chromatography, TLC)」等三種方法,鑑定所採集之地衣所屬種類,並探討空氣污染程度對金面山地衣類分佈狀況的影響。調查至2002年6月為止,本研究已發現生長於金面山區之數種地衣,其中殼狀地衣包含有:癩屑衣屬(Lepraria)、球粉衣屬(Spheophorus)、大孢衣屬(Megalospora)等三屬;屬於莖狀地衣的僅有石蕊屬(Cladonia);為葉狀地衣的則有:黃梅衣屬(Xanthoparmelia)、裸緣梅衣屬(Parmotrema)、梅衣屬(Parmelia)等三屬,合計共七個屬。本研究針對臺北市金面山區及麗山高級中學之校園附近市區道路地衣類分佈的情形做調查,結果發現行道樹上之附生地衣在較靠近山區的地方,於樹幹上的生長覆蓋面積才會有明顯增加的情形,又其中在市區道路上只發現殼狀地衣生長,而莖狀及葉狀地衣則出現於金面山頂附近,所以就此情況而言,除了金面山區外,市區已呈現地衣沙漠化之狀況,間接顯示,市區的空氣污染是相當嚴重的。本研究將所調查結果之各屬地衣類進行特徵描述與分佈地區之標定,以便於日後臺北市內湖區金面山地衣之鑑識及後續相關研究之進行。This research was carried out between July 2001 and June 2002 on the Jinmian Mountain in Neihu,\r Taipei City and consisted of an on-the-spot exploration and collection of lichen. The Taipei Municipal\r Lishan High School was the center of this research, and the researched territory consisted of the areas\r between the mountain at the back of the school (Jinmian Mountain) and the intersection between\r Gangcian Rd. and Huanshan Rd. in front of the school’s main gate. Comparison of external appearance,\r dissectional observation (manual breaking technique), and chemical analysis (Thin Layer\r Chromatography, TLC) were the research methods applied to determine the genus of the lichen and the\r influence of the degree of air pollution on the distribution of the lichen.\r By the end of the research in June 2002 the presence of three types of lichen on the Jinmian\r Mountain was observed: crustose lichen: Lepraria, Spheophorus, Megalospora; fruticose lichen: Cladonia;\r foliose lichen: Xanthoparmelia, Parmotrema, Parmelia. Seven different genus of lichen have been found.\r The research has been done on the distribution of these different genus of lichen in the area of the\r Jinmian Mountain and The Taipei Municipal Lishan High School: By observation the sidewalk trees\r near the mountain’s area, we found the covering area of the lichen on the sterns apparently increases,\r while on the trees in the city district, only crustose lichen grow. The fruticose and foliose lichen only\r grow near the top of the Jinmian Mountain. This impoverishment of the diversity of lichen in the city\r district might (indirectly) be an indicator of the considerable decline of air quality in the city. The\r outcomes of this research regarding the description and distribution of the lichens contribute to the\r knowledge on lichens in the Jingmian Mountain area in the Neihu District, and may raise the similar\r research in the future as well.
> 更多
a. PURPOSE: Do babies between 0 – 3 months have certain sound reflexes that can be interpreted as a language? Can parents be helped to understand their newborn babies better? Are parents aware of infantile speech patterns and language acquisition in babies? b. PROCEDURES: 70 Babies of different cultures were tested to determine if the 5 crying-sounds can be an indication of the baby's need. Questionnaires and information were given out at hospitals and clinics. Doctors, paediatricians, sisters and parents were involved in my project. DVD's were made to show and explain the different sounds. c. DATA: I obtained my data from the questionnaires, interviews with parents, doctors, paediatricians and the staff working in the labour-wards. 70 Babies were tested (68 responded) and I listened to every cryingsound to make sure that there are only 5 different sounds. I made a DVD from all the sounds of the babies that I've tested. Data were also gathered from science. d. CONCLUSIONS: According to all the research and sources, I can positively say that a person can identify the reason why babies (0-3 months) are crying. Babies of any culture, have universal sounds that indicate their needs. The different sounds are: EH – upper gas, EAIRH – lower gas, HEH – discomfort, OWH –tired, NEH – hungry.
> 更多
科展作品檢索
Biological control of Aphis craccivora Koch., a common pest of the cow pea Vigna unguiculata(L.)
The purpose of this project is to control the Aphis craccivora Koch. on the cow pea Vigna unguiculata (L.) by using two predators, the earwigs (black) beetle, Proeus simulans Stallan and the ladybird beetle, Micraspis discolor (F.). The experiments were carried out in the closed system in the laboratory and in the opened field with various ages of Proeus simulans Stallan and Micraspis discolor (F.) from the 1st - 4th stage of embryo to the adult form. Prior to the study in the field, the capability of the predators, Proeus simulans Stallan and Micraspis discolor (F.), that can eat the Aphis craccivora Koch. within a period of time was set up in the laboratory. The result showed that the 1st-4th stage of embryo of Micraspis discolor (F.) can eat 8.46+1.25 – 12.50+0.60, at 95% confidence, Aphis craccivora Koch. per day, while its adult can eat at the average number of 43.66 + 0.78, at 95% confidence, per day. The 1st–3rd stage of Proeus simulans Stallan embryo and the adult form can eat Aphis craccivora Koch. at the average number of 2.37+0.33 – 3.74+0.29 and 9.84+0.36, at 95% confidence, per day, respectively. This data showed that Micraspis discolor (F.) was more efficiency as predator than Proeus simulans Stallan. The insecticide activity of these two predators in the closed field (8 m x 9 m) was then determined. The number of Aphis craccivora Koch. on the plant was randomly counted everyweek for 10 weeks. It was found that the number of Aphis on the experimented and control groups were 16.20+4.30 and 2,582.00+102.40, at 95% confidence, per plant, respectively. The result support the efficiency of the two predators in controlling the pest. When the experiment was set up at the two opened field (6 m x 30 m, each field), 27.51+2.74 and 52.11+5.21, at 95% confidence, of Aphis craccivora Koch. were found on the plant of experimented and control groups, respectively, at the 10th week. The lower number of Aphis on the control plant might possilbly due to the interference from natural predators. From this study, the biological control of Aphis craccivora Koch. on the cow pea Vigna unguiculata (L.) could be achieved by using Proeus simulans Stallan and Micraspis discolor (F.). To avoid the use of chemical insecticides, biological control should be trained to farmers to help reduce the environmental problem.
> 更多
科展作品檢索
Palatability Tests on Rana Chalconota Tadpoles
The skin of amphibians can secrete poisons from glands which reduces Palatability or sometimes result in rejection by predators. My research serves to confim the hypothesis that the pair of glands located on the ventral side of Rana Chalconota Tadpoles acts as an anti-presatory structure. Their palatability was measured by the consumption of them at developmental stages intermediate and post-metamorphic by Channa gachua and Giant Dragonfly Nymph. A known-palatable tadpole, Rana malesiana, was used as a control.
> 更多
在這篇報告中,我們探索了「將錯就錯的Knuth 河內塔問題」。傳統河內塔問題在電腦科學上佔有重要的地位,是一個極具內涵的模型。由於這個模型的深厚數學內涵,使其和巴斯卡三角形建立了緊密的連結,且利用這個緊密的數學連結,設計出復原任意起始狀態的良好演算法。Knuth 河內塔起因於數學家Knuth 在論文[3]中,描述傳統的河內塔問題時所發生的一次筆誤。在這個新的規則之下,我們意外發現Knuth 河內塔存在著一個和傳統河內塔平行的模型,此模型在電腦科學及數學上有著完全不同於傳統河內塔的內涵。我們的研究主要如下:(分別為內文中的四大段)(一) 結構分析。移動環所需要的次數,如何移動環並分析每一次動作所動的環,及每個環何時被動到並給出演算法。(二) 正整數的分割。所有的移動步驟將正整數做了一個新的分割(Partition);此分割模k之後有良好的循環性質。(三) 費波那契真分數的排序。這個正整數的分割形成一張表,這張表恰好就是分子分母皆為費波那契真分數之排序。(四) 隨意亂排的Knuth 河內塔復原演算法。在Knuth 河內塔的規定下將起始狀態改變,找出良好的復原演算法,並分析。 In this project we study the "Knuth Hanoi Tower", which is motivated by a typo in a paper of Knuth. This inadvertently typo leads to a new rule of moving the discs on the Hanoi Tower (see introduction below for definition). Although seemingly similar to the traditional Hanoi-Tower problem, it turns out that under this rule the "Knuth Hanoi Tower" problem consists of amazing properties, and is totally different from the traditional one. Our study focuses on the following directions: (1) Structure analyzing: We analysis the sequences recording the disc moving and offer enumeration results and recurrsive/non-recurrsive algorithms. (2) Partition of N: The moving sequence forms a partition (a table) of N, which has an amazing congruence property. (3) The order of Fibonacci proper fraction: The row/column of the partition table is, even more amazing, exactly the order when sorting the Fibonacci proper fraction with fixed denominator/numerator. (4) The Restoration of an arbitrary initial state: We offer an efficient algorithm for restoring any initial state of discs. We hope that our study on the "Knuth Hanoi Tower" offers a simple, neat, and new example on the theory of Algorithm, Number theory and Combinatorics.
> 更多
科展作品檢索
表面粗糙結構對疏水性影響之應用與研究
本研究從大自然中之「蓮花效應」引發學習興趣與研究動機,在蒐集相關資訊與文獻後,發現疏水功能不只是防水,還關係著日常生活品質之許多材料特性,包括防水、撥水、防潮、防銹、防蝕、抗菌防污、自清潔…等。而影響固體表面疏水性之兩大特性,包括物理之表面粗糙度與化學之超低表面能,本研究針對物理之表面粗糙度與疏水性之關係做探討,以相同之化學特性來比較不同號數之工業用砂紙之疏水行為,並就廣泛被引用之兩種模擬表面粗糙度與疏水性關係之模式:Wenzel and Cassie model,比較現有文獻對兩種模式之特性,選擇Cassie model 來進一步實驗驗證,以量測之平均接觸角 Θ 推算Cassie model 之表面粗糙係數Φ 值,並簡化不同砂紙顆粒模型為相同粒徑之球狀,以簡化之方程式來求得水珠與砂紙顆粒之實際接觸面積與球心夾角 θ,以提供高中學校能在經費與設備之限制下,仍能有效應用與印證Cassie model,獲得砂紙顆粒直徑與球心夾角 θ 自然對數值之關係。並就疏水性之生活應用,建立接觸角與 Φ 之關係曲線,驗證實驗之方程式,與延續過去之科展成果,以實驗成果提出可行性應用之建議。The interest and motivation of the present work was introduced from “lotus effect” in nature. After we collected related literature and information, we found that the function of the so-called “superhydrophobicity” behaves not only water repellency, but also a variety of real-life applications, including anti-fog, anti-corrosion, anti-bacteria, anti-fouling, self-cleaning, and so on. Pervious studies have pointed out that two criteria affecting the performance of hydrophobic surfaces are physical (roughness) and chemistry (surface tension) properties. This study focused on influence of physically surface roughness on hydrohyphobicity. Based on an identical surface chemistry, we employed different types of industrial sandpapers to mimic the lotus leaf, and investigated the relationship between roughness and hydrophobicity by using two famous models: Wenzel and Cassie models. Comparing with their basic assumptions to our study, we applied Cassie model to confirm our experimental results, in where one Cassie parameter (?) was proposed to simplify the Cassie equation. This superhydrophobic behavior can be well predicted by the Cassie model. This study continues previous achievement and offers some practical utilization according to our\r experimental results.
> 更多
科展作品檢索
廣鹽性吳郭魚氯離子調節機制- - - NKCC在氯細胞中扮演之角色
本實驗中我們利用廣鹽性吳郭魚進行氯離子調節機制的研究,探討廣鹽性吳郭魚如何能在不同環境中維持體內氯離子恆定,進而適應生存環境。我門想要探討:『是否NKCC 這種蛋白質在淡水吳郭魚MR 細胞中扮演吸收 Cl- 的角色? 如果是,吳郭魚又如何藉NKCC 的調節適應環境中 Cl- 的變化呢?』我們利用細胞免疫螢光染色法、西方墨點法和共軛焦顯微鏡觀察分析NKCC 在不同 Cl- 濃度人工淡水馴養的吳郭魚MR 細胞上的表現量,結果發現 NKCC 分布於頂端細胞膜(又稱為細胞開口),及其附近的細胞質內;環境中 Na+ 濃度的差異對NKCC 在MR 細胞上的表現影響不大,但低 Cl- 環境馴養的吳郭魚,NKCC 表現量都高出其他組很多。顯示NKCC 參與了氯吸收的機制。另一個實驗中,我們將吳郭魚由淡水中轉移至海水以分析它們在適應海水的過程中NKCC 的表現變化。結果發現在馴養初期(16 小時內),圓點狀NKCC 仍然可以在MR 細胞的開口附近觀察到,但到了24 小時後,NKCC 在開口的表現就明顯減少甚至消失,取而代之的是轉移到底側邊細胞膜上的NKCC。此實驗證實了NKCC 這一個與Cl-運送相關的蛋白質,在廣鹽性吳郭魚氯離子調節中扮演了很重要的角色。
Euryhaline tilapia (Oreochromis mossambicus) is capable of maintaining internal ion constant ineither hypertonic or hypotonic environments (fresh water or seawater).MR cells in the gills of tilapia play critical role in absorbing Cl- from fresh water or pumping redundant Cl- from body fluid into seawater. Chloride transporter (NKCC) which distributed in basolateral membrane of MR cells is involved in Cl- secretion of seawater teleost. However, the mechanism of Cl- absorption in fresh water MR cells is still unclear. Whether NKCC is also involved in Cl- absorption and how do tilapia regulate Cl- absorption are the questions this study aim to answer. By using immunofluorescent staining, western blot, and confocal microscopy, the distribution and expression level of NKCC in fresh water MR cells were examined. We found that NKCC is distributed on the apical membrane of freshwater MR cells where is known to be the site for active Cl- absorption of MR cells. We compared the expression level of NKCC in MR cells from tilapia acclimated in high, normal, and low Cl- artificial water for 7 days. The results showed that NKCC is induced by ambient low Cl- , and in contrast suppressed by high Cl- water, indicating NKCC might be involved in Cl- absorption of freshwater MR cells and up-or down-regulated to maintain Cl- uptake constant. In addition, we also examine the expression pattern of NKCC in MR cells from tilapia transferred from fresh water to seawater. Confocal images show that apical expressed NKCC disappear gradually within 24h seawater acclimation and is substituted by basolateral expressed NKCC. This study provides a novel regulatory mechanism of NKCC in Cl- transporter of MR cells.
> 更多
科展作品檢索
Nonlinear Time Series Analysis of Electroencephalogram Tracings of Children with Autism
Methods of nonlinear time series analysis were compiled for use in the analysis of Electroencephalogram (EEG) tracings of children aged three to seven with varying degrees of autism in order to provide a quantitative means of diagnosing autism and determining its severity in a child. After determining the EEG leads to be used for analysis, the identified methods were coded and saved as functions on Scilab. To test the compiled program, a minimum of five EEG readings per cluster of children diagnosed with mild, moderate, severe and no autism will be obtained. The project was able to identify the mean, standard deviation, skewness, kurtosis and other higher order moments, the autocorrelation function, and the Fourier Series as the time-resolved statistical methods to be used for time series analysis. The nonlinear analysis methods identified include the use of the correlation integral, time-delay embedding and the Lorenz equations. One-way ANOVA testing will then be used on the numerical data obtained from the analysis to determine if a significant numerical differentiation has been obtained between the different clusters of EEG. This will provide a definitive way to medically diagnose autism, pinpointing children afflicted with the disorder and giving them proper treatment.\r Two copies of the "Abstract of Exhibit" (in English) should be sent to the National Taiwan Science Education Center or email to fung@mail.ntsec.gov.tw or yuonne@mail.ntsec.gov.tw before December 31, 2009.
> 更多
科展作品檢索
淨化我們喝的水-經濟方便的再生過濾器雛型
近年來由於土地過度開發,經常發生土石流,使得自來水廠進水混濁度太高,過濾設施無法正常運作,本實驗裝置可以利用氣昇?和重力作用,來清洗濾層中殘留物物比重較大的雜質,而且濾砂含自動控制昇?還可以重覆使用,如此便能先處理河川中大量的河水。整個過濾器主要分三個部分;(1)下端進水處理處為高比重的雜質重力沉澱處。(2)圓錐狀的濾層以利於自動清洗時砂層的循環。(3)自動清洗監控部分。濾砂清洗的影響因子為濾層厚度的重力、氣昇?壓力含進水量三者交互作用。濾砂以硬度大的石英砂最佳,濾層高度為25cm,平均進水量0.23升/秒,為最佳處理狀態可獲得原水78.5%的乾淨濾液。Debris flow occurs frequently due to the over-development of watershed recently. The water used as the input of water treatment factory is too turbid to be filtered by the traditional facilities. In this study on experimental apparatus was designed to remove the high density particles or suspended impurities. This apparatus can be used as a pretreatment apparatus of filtering factory. There are three main parts in own apparatus: (1) The precipitation one which is the site for precipitating of high specific gravity impurities (2) Cone shape filter layers which allows for cycle cleaning the sand layers (3) The automatic monitoring apparatus. The effet of water flow rate, air pressure, gravity and the height of filter layer on the performance of the experiment were discussed in this study. Experimental results showed that in the study, the height of filter layers is 25 cm, and the average water volume flow rate is 0.23 liter/sec. The apparatus can achieve a 78.5% leaner filtrate from the original water sample.
> 更多