丙酮的

The repellent action and contact action of the extracts of 21 species of plants to adult maize weevil, Sitophilus zeamais Motschulsky were studied.

为了筛选对粮库安全的植物源杀虫剂，研究了21种植物的4种溶剂(无水乙醇、丙酮、乙酸乙酯和石油醚)提取物对玉米象Sitophilus zeamais Motschulsky的驱避和触杀作用。

However, when trans-4-aryl-3-buten-2-ones were taken as the substrates, the electron-rich but less sterically hindered ligand 9c gives the best results (up to 96.4 % ee) with highly catalytic activity.

而富电子但空间位阻小的配体9c对亚节基丙酮类底物获得最好的结果(%。4%ee)，同时还表现了最好的化学活性。

By GAS recrystallization HMX(1,3,5,7 tetranitro 1,3,5,7 tetraazacyclooctane),we can obtain microparticle β HMX with different particle size and distribution.The effect of temperature on morphology of HMX in the processes of supercritical carbon dioxide antisolvent recrystallization in acetone solution was studied.

研究了以丙酮为溶剂的超临界 CO2 - GAS重结晶制细过程温度对 HMX晶型的影响，结果表明：超临界 CO2 - GAS重结晶 HMX过程与常规的重结晶过程相似，温度对 HMX晶型起控制作用，而对颗粒尺寸影响不大；当局部操作温度大于 5 0℃时，结晶颗粒中会有α型 HMX生成；当整体温度大于 6 0℃时，产品中α型 HMX占主要部分。

A series of lanthanide complexes (Ln = Er, Nd, Yb) with infrared emission properties were designed and synthesized by using different anionic ligands [1 -phenyl-3-methyl-4-(4-tertbutylbenzoyl)-5-pyrazolone and l-phenyl-3-methyl-4--5-pyrazolone and 2-naphtoyl trifluoroacetone] and netural ligands (2,2-dipyridine, phenanthroline, triphenylphosphine oxide and water). Three crystal structures of these complexes were obtained and structure studied, and the properties of photoluminescence and fluorescent lifetime were studied in detail.

我们通过选用不同的第一配体[1-苯基-3-甲基-4-(4-异丁酰基)-5-吡唑酮，1-苯基-3-甲基-4-(4-叔丁基苯甲酰基)-5-吡唑酮和2-萘基三氟乙酰丙酮]和第二配体(2，2-联吡啶，邻菲啰啉，三苯基氧膦)合成了16个稀土红外配合物(Ln=Er，Nd，Yb)，获得了其中三个配合物的单晶结构，研究了这些稀土红外配合物的光致发光和荧光寿命等性质。

Unoxidated and oxidized wheat stalks were extracted sequentially with CS2, benzene, methanol, acetone and THF, and the extraction solutions were analyzed with GC/MS. The relative contents and compositions of fractional extracts of un-oxidized and oxidized wheat stalks were compared.

采用二硫化碳、苯、甲醇、丙酮和四氢呋喃对未氧化和氧化的麦秆进行分级萃取，比较麦秆各级萃取物的相对含量和组成差异，并对各级萃取物的组成进行GC/MS分析。

The similar nicotinoyltrifluoroacetones are synthesized from acetylpyridine and ethyl trifluoroacetate through Claisen reaction.The influnences of alcoholic natrium,reaction temperature and solvent on reaction yield is studied.The subliming method is improved.

本文以乙酰吡啶和三氟乙酸乙酯为主要原料，利用克莱森酯缩合反应，合成了三种相似结构的吡啶甲酰三氟丙酮化合物，考察了碱性试剂醇钠、反应温度和溶剂等因素对反应产率的影响，改进了纯化产物的方法。

The pathogenicity of pathogen was enhanced by washing leaf surface with acetone and 700% alcohol and by exposing the seedlings out of green-house.

在侵染试验中，用丙酮和70％酒精清洗的幼苗叶片发病加重；露天放置的烟苗较生长在温室内的烟苗发病重。

The solvent effects of C24H30O8 have also been investigated based on Onsager self-consistent reaction field model in chloroform, acetone,DMSO and water.

采用密度泛函理论方法，在B3LLYP/6-31G*水平下全优化得到了该化合物的分子几何构型和电子结构；依据Onsager自恰反应场模型考察了其在氯仿、丙酮、二甲亚砜及水等溶剂中的溶剂化作用；基于气相优化结构进行了B3LYP/6-31G*振动分析，用0.9613校正后的主要红外光谱与实验符合得很好。

The solvent effects of C24H30O8 have also been investigated based on Onsadger self-consistent reaction field model in chloroform, acetone, DMSO and water.

采用密 度泛函理论方法，在B3LYP/6-31G＊水平下全优化得到了该化合物的分子几何构型和电子结构；依据Onsager自恰反应场模型考察了其在氯仿、丙酮、二甲亚砜及水等溶剂中的溶剂化作用；基于气相优化结构进行了B3LYP/6-31G＊振动分析，用0.9613校正后的主要红外光谱与实验符合得很好。

In this work,a full optimal calculation on the molecular geometry and electronic structure of C24H30O8 has been performed using density functional theory methods at B3LYP/6-31G* level.The solvent effects of C24H30O8 have also been investigated based on Onsager self-consistent reaction field model in chloroform,acetone,DMSO and water.

采用密度泛函理论方法，在B3LYP/6-31G*水平下全优化得到了该化合物的分子几何构型和电子结构；依据Onsager自恰反应场模型考察了其在氯仿、丙酮、二甲亚砜及水等溶剂中的溶剂化作用；基于气相优化结构进行了B3LYP/6-31G*振动分析，用0.9613校正后的主要红外光谱与实验符合得很好。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。