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| 題 名 | 應用新法判定對掌分子組態的右旋和左旋=The Determination of Rectus and Sinister to Chiral Molecule Configuration using New Method |
|---|---|
| 作 者 | 劉宏雄; | 書刊名 | 化學 |
| 卷 期 | 54:1 1996.03[民85.03] |
| 頁 次 | 頁71-86 |
| 分類號 | 348.221 |
| 關鍵詞 | 對掌碳; 右旋; 左旋; 內消旋化合物; 外消旋混合體; 立體特異性反應; Chiral carbon; Rectus; Sinister; Meso compound; Racemic mixture; Stereospecific reaction; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 在考量周年性疏菜契作所會面臨的季節性問題及參酌各界對擴大夏季蔬菜契作的意 見後,本研究針對契作目標量、保價基準與休耕轉作補貼分別設立數種估算方法,並依各項 組合設計出九種周年性蔬菜契作計畫方案。進而以包心白菜、甘藍及蘿蔔為實證對象,以分 別估算各周年性蔬菜契作計畫在模擬期間之經濟成率與經濟效益,而三種契作菜種因價差補 貼導致產品農業補貼程度的變化情形亦加以探討。 由各方案成本-效益評估分析的結果得知,周年性蔬菜晱作計畫之經濟效益因契作目標 量、保價基準以及裡作休耕轉作辦法而異。在計畫模擬期間內,以包心菜為周年契作菜種所 能達到的計畫淨效益最高,蘿蔔次之,而甘藍各方案之淨效益皆為負值。而甘藍及蘿蔔各契 作計畫方案之益本比值皆小於一,故九種周年性契作方案均不適用於甘藍與蘿蔔。此外,絕 大部分的周年性契作方案皆可能導致契作菜種農業補貼程度的提高。 |
| 英文摘要 | For evaluating the costs and benefits of year-round vegetable contract marketing program, nine altermative projects were proposed. They were based on different measures of target marking volume, under guaranteed price as well as land set-aside or transferring subsidy by considering the seasonal instability in vegetable production. Each of the nine projects was then implemented to Chinese cabbage, cabbage, and radishes for empirical appraisal and comparison. The effets of increasing deficient payments to contracted vegetables on augmenting the extent of farm subsidy needed was also investigated in this study. Simulation results showed that the economic benefits of year-round vegetable contract marketing program varied depending on contracted volume, method used in pricing, and land subsidy. Higher economic benefits can be generated from implementing the year-round program to Chinese cabbage, followed by radishes, while cabbage can provide only negative benefits. In addition, benefit-cost ratios for cabbage and radishes are less than one, no matter which project is evaluated. Thus, neither cabbage nor radishes should be considered for implementing the nine proposed year-round programs. Finally, farm subsidy would be increased under most of the contract marketing programs. |
本系統中英文摘要資訊取自各篇刊載內容。