precursor activity 中文意思是什麼

precursor activity 解釋
前兆活動
  • precursor : n. 1. 前輩，前驅，先鋒；前任。2. 預兆；先兆。3. 預報器。4. 【原子能】前驅波；初級粒子。
  • activity : n. 1. 活動；活躍；動作；活動力；能動性。2. 活性；放射性。3. 機能，功能。4. 〈美國〉機構。5. 〈pl. 〉 活動范圍。
  1. The influence of preparing conditions on aluminum titanate composing was inquired. by analyzing element content of alumina and titania source, arranging a stoichiometric dosage, and keeping the chemical homogeneity from sol to mixed ti - al oxide precursor, a high activity powder was prepared. after calcining the precursor powder at 1250 for 2h, aluminum titanate phase is formed

    本試驗通過準確測定起始物的ti 、 al含量，嚴格化學配比，採取適當措施將微尺度上的組成均勻性從溶膠一直保持到混合鋁鈦氧化物前驅體的生成，使該粉體具有高活性，將其在1250煅燒2h ，已合成出以鈦酸鋁為主晶相的產物，比文獻報道的鈦酸鋁相的最低生成溫度降低了50 。
  2. Analyzing on sequence characteristics, earthquake source, medium rupture characteristics, source conditions, historical seismicity, regional earthquakes and anomaly change of precursor data, etc., we know well regional background of seismic activity before the m ( subscript s ) 6. 1 the earthquake and judge earthquake situation trend after the m ( subscript s ) 6. 1 the earthquake

    摘要通過分析昭蘇6 . 1級地震序列特徵、震源與介質破裂特性、震源環境與歷史地震活動類比及區域地震和前兆資料的異常變化等，對該震前的區域地震活動背景、震后的震情趨勢等有了較為細致的了解和判定。
  3. The ratio of isopropyl alcohol and pure water and temperature in the process of freezing are considerated in the research of the preparation of the pt / c electrocatalysts with freeze - drying method. the result shows, when we use 300ml pure water to wash the carbon ( 40mg ) in isopropyl alcohol ( 20ml ) to alter the ratio of isopropyl alcohol and pure water, we get the electrocatalysts with high catalytic activity ; the use of the liquid nitrogen ( - 196 ) to freeze the suspension ( carbon and precursor solution ) can make the pt / c electrocatalysts in high dispersion

    採用300ml純水對20ml異丙醇中的40mg碳載體進行洗滌抽濾，來改變預凍液中的醇水比例，通過冷凍乾燥制備pt / c的性能較好;採用液氮對預凍液進行冷凍（預凍溫度為- 196 ）制備的pt / c催化劑性能較好;冷凍乾燥法可以有效地避免加熱乾燥過程中前軀體離子在碳載體表面的脫附和團聚，進而制備載量大、分散性好、粒徑較小的pt / c催化劑。
  4. In this paper, the authors studied a method, in which the anomaly parameter of seismic precursor is abstracted form the observed data of underground water level, and the spatial distribution patterns of the anomaly parameters in north china was scanned from 1984 to 2002 by using the parameters abstracted as inputs, and than, every pattern was superposed with the numerical pattern or quantitative evaluation about the tectonic activity and seismic risk in north china, to realize combining the spatial scanning of precursor anomaly with active tectonic background

    摘要對地下水位地震前兆異常開展了參數提取方法的研究，並以其提取的結果為輸入，對1984 ~ 2002年華北地區地下水位異常參數分佈做了全時空掃描，繼而將全部圖像與華北地區構造活動性量化評估的數字化圖像進行了疊加，實現了地下水位異常動態掃描與區域構造活動性背景的結合。
  5. The effect of the new platinum precursor on the activity of automotive emission purification catalyst

    新型鉑前驅體對汽車尾氣凈化催化劑活性的影響
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