Browsing by Issue Date, starting with "2009-06-14"
Now showing 1 - 20 of 50501
- Results Per Page
- Sort Options
Item type:Item, Item type:Item, Item type:Item, Item type:Item, 傳說中 那虛幻的生物(2009-06-14) ;趙祿平 ;Department of Communication and Technology傳播與科技學系標題我亂用得 請好好想唷~啾咪~ 歐 我發現我按下去會出現兩個 但是我只想要下面那個比較大的 可以幫我把上面那個刪掉嗎?? 下面那個是可以編輯的 別亂砍就不會消失 但是上面那個我就不知道了 = =Item type:Item, 排球新制 上路急推行(2009-06-14) ;陳碩峰 ;Department of Communication and Technology傳播與科技學系題目會再改 主題是在講排球新規則的公佈 與新規則的不同點 與造成的效應Item type:Item, Item type:Item, Item type:Item, Item type:Item, Item type:Item, 走近原民 大學生上山課輔(2009-06-14) ;黃湘茹 ;Department of Communication and Technology傳播與科技學系其實我不太知道這是屬於哪個欄目耶....Item type:Item, Item type:Item, Item type:Item, Item type:Item, Item type:Item, Item type:Item, Item type:Item, Item type:Item, Item type:Item, Near-infrared silicon quantum dots metal-oxide-semiconductor field-effect transistor photodetector(2009-06-15) ;Shieh, Jia-Min ;Yu, Wen-Chien ;Huang, Jung Y. ;Wang, Chao-KeiDai, Bau-TongA fully silicon-based metal-oxide-semiconductor field-effect transistor is demonstrated for the detection of near-infrared light. Si nanocrystals (nc-Si) are synthesized in the nanopore channels of mesoporous silica (MS) inserted between two oxide layers to form a complete gate structure of polycrystalline Si/SiO(2)/nc-Si-in-MS/SiO(2) with a polycrystalline Si electrode. Illuminating the gate with near-infrared light, a photoresponsivity as high as 2.8 A/W at 1.55 mu m can be achieved. The improved photoresponsivity is attributed to from optical transitions via interface states and a current amplification mechanism of the device.Item type:Item, Toxicity and quantitative structure-activity relationships of benzoic acids to Pseudokirchneriella subcapitata(2009-06-15) ;Lee, Po Yi ;Chen, Chung Yuan ;環境工程研究所Institute of Environmental EngineeringThe present study presents the toxicity data of benzoic acid and its derivatives on Pseudokirchneriella subcapitata, in terms of EC50 and NOEC values. Median effective concentrations (EC50) range from 0.55 to 270.7 mg/L (based on final yield) and 1.93 to 726.3 mg/L (based on algal growth rate). No-observed-effect concentration (NOEC) is within the range of <0.0057-179.9 mg/L. From both the NOEC and EC50 values, it was found that, 2,4,6-trihydroxybenzoic acid, 4-chlorobenzoic acid, 3-bromobenzoic acid, 4-bromobenzoic acid, 2,6-dihydroxybenzoic acid. and 2,3,4-trihydroxybenzoic acid possess much higher risks to the aquatic organisms as compared to the other benzoic acids. These data are useful for risk assessment and protection of the aquatic environments, because such information is not available in the existing toxicological databases. The toxicity of halogenated benzoic acids was found to be directly related to the compound's hydrophobicity (the logarithm of the 1-octanol/water partition coefficient, logKow). On the other hand, the number of hydroxyl groups (N(OH)) had a determinant influence to the toxicity of hydroxybenzoic acids. Quantitative structure-activity relationships were established to correlate the observed toxicity with logKow and N(OH) values. These statistical correlations are highly significant with the predictive power Q ranging from 0.896 to 0.955. Furthermore, in terms of the species sensitivity, the luminescent bacteria (Microtox) and the alga P. subcapitata appeared to be more susceptible to benzoic acids than the water flea and ciliate. (C) 2008 Elsevier B.V. All rights reserved.