时基

The scavenging effects of different solvent extracts on hydroxyl radicals produced by the system were compared by phenanthroline oxidation method, and change conditions of scavenging rate of hydroxyl radicals with the prolonging of time were studied.

方法］采用超声波提取法，分别以蒸馏水、50%乙醇和95%乙醇为溶剂，在40℃条件下提取30 min，获得了薄荷的不同溶剂提取物，并以邻二氮菲氧化法比较了不同溶剂提取物时体系产生的羟基自由基的清除作用，并研究随时间延长羟基自由基清除速率的变化情况。

The phosphine was quickly oxidized by triplet oxygen to phosphineoxide with a free radical chain reaction at relatively low temperature; while at high temperature, the phosphine react with singlet oxygen through a three member ring intermediate to form phosphineoxide and phosphinate as the product.

在相对较低温度时，膦化物与基态氧发生自由基链反应，膦化物很快被氧化为氧化膦；在相对较高的温度，膦化物与激发态氧直接作用，通过三元环状中间体而最终生成氧化膦和次磷酸酯。

GA3 contents, POD activities and invertase activities started to increase significantly while IAA contents started to decrease significantly when plants entered the critical stage of flower-bud differentiation; GA3 contents, POD activities and invertase activities emerged high apex value while IAA contents emerged low apex value when plants entered stage of primar...

当植株进入花芽分化临界期时，叶片中GA3含量以及POD和转化酶活性均开始剧增，而IAA含量开始剧减；当植株进入第1侧花茎原基分化期和第2～3侧花茎原基分化期，叶片中GA3含量和POD、转化酶活性均出现一高峰值，而IAA含量出现一低峰值。可见，青花菜侧花茎每一级的花芽分化要求较高含量的GA3、较低含量的IAA和较高活性的POD、转化酶。

During root primordia initiation,large amount of starch depleted,the amount of protein,free amino acids and peroxidase activity increased.

在根原基形成时，淀粉大量消耗，蛋白质和游离氨基酸含量增加，过氧化物酶活性增强；而在根原基形成后根的生长过程中，淀粉含量回升，蛋白质、游离氨基醚含量和过氧化物酶活性下降。

As a key step of the synthesis, the Friedel-crafts acylation was researched. And the optimal operation variables were determined through orthogonal experiment: when 0.lmol acetanilide, 0.26mol aluminum chloride, 0.12mol propionyl chloride and 200ml carbon disulfide are introduced, and the reaction time is 5 hour, the yield can be up to 57.3%. The solid super acid catalyst was preliminary studied. Four solid super acid catalysts were prepared to take the place of aluminum chloride, and it was indicated that AlCl3 acidic resin can better catalyze the Friedel-Crafts reaction of acetanilide.

对合成路线中的Friedel-Crafts酰基化反应进行了研究，运用正交实验设计确定了最佳工艺条件：当乙酰苯胺用量为0.1mol时，AlCl_3用量为0.26mol、丙酰氯用量为0.12mol、溶剂用量为200ml、反应时间为5h，产率可达到57.3％；对于固体超强酸催化剂进行了初步研究，合成了四种催化剂，其中负载AlCl_3强酸性树脂对于乙酰苯胺的Friedel-Crafts酰基化具有一定的催化活性。

Where Mr Kaczyński stoked rows and fumed about historic wrongs, Mr Tusk, and his high-profile foreign minister Radek Sikorski, smoothed them over.

当卡钦斯基先生激起争论和因波兰历史上遭受的冤屈感到愤怒时，图斯克先生和他的态度鲜明的外交部长内达克斯考斯基一起去化解。

The fresh weight and basal diameter of the cut curcuma flowers decreased with time after harvested without inserted them into water immediately. Thus, the vase life decreased. The even of the off-water time is only 30 minutes. One gram of fresh flower can absorb 30-40mg of fresh water, and the vase life increased 2-4 days if the stem base were recut, The curcuma flower per se after carting didn't posses peak of respiration and release of ethylene as well.

姜荷花切花采收后随著离水时问增长，鲜重与花茎基部直径渐减，瓶插寿命亦随之缩短，离水仅0.5小时切花即明显受要影响，花茎基部重新切除可增加10-20mg/gF.W的吸水量，而延长瓶插寿命，但同样随著离水时间延长而降低瓶插寿命。

It is concluded that the viscous deformation of the mat rix should be involved in const ructing a constitutive model for the ratcheting of the composites.

在建立玻璃短纤维增强不饱和聚酯树脂基复合材料棘轮行为的本构模型时必须考虑基体的黏性变形特征。

Former contract manufacturing arm of Acer that was spun off in 2000, signalled its interest in the e-reader market when it last month acquired Polymer Vision, a Dutch e-paper company specialising in flexible, rollable displays.

Polymer Vision专长于生产可弯曲、可卷动的显示屏。纬创资通原先是宏基旗下的一家代工企业，2000年时从宏基分拆出来。

Firstly, this paper based upon coordinate transformation in vector space, the resolution principles of ship's swinging in three rotative axes of a hull – mounted array sonar are developed. The analytical results are used as the rules to control and stabilize the attitude of the array sonar so as to isolate the swinging of the ship.

本文首先根据矢量空间坐标变换的原理，分析了船舶摇摆运动在声纳基阵转动轴上的分解原理，得出了控制和稳定声纳基阵姿态不受船舶摇摆影响时所需的控制规律。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失