查询词典 silica

Silica, in fact, is a desirable impurity because it is one of the reactants

硅石实际上是一种有用的杂质，因为它是一种反应剂。

Silica, in fact, is a desirable impurity because it is one of the reactant s

硅石实际上是一种有用的杂质，因为它是一种反应剂。

The research results indicated that the performance of concrete, particularly the performance of resistance to chloride ingression, has been greatly improved by adding various reactive mineral materials, such as ground granulated blast furnace slag, fly ash and silica fume.

结果表明，矿物掺合料的掺入可以极大地改善混凝土的性能，特别是抗氯离子侵蚀性能，从而提高混凝土结构的使用寿命。

Methods 48 rats were randomly divided into saline control groups and silica instillation groups, and silicosis model was established in rats.

48只大白鼠随机分为二氧化硅灌注组和生理盐水对照组，制作大鼠硅肺纤维化模型。

Objective To explore the changes of apoptosis of cells in the lung tissue of rats with silica instillation and to its significance in silicosis, and to clarify the role of caspase-3 in the apoptosis progress.

肺纤维化是一组由多种病因所引起的肺破坏性疾病，目前的治疗一直未能改善其不良的预后，故加深对肺纤维化的认识，并在此基础上发展新的治疗策略已尤为迫切[1]。

Fast analysis of perchlorate was carried out by ion-pair chromatography using a silica-based monolithic column and direct conductivity detection.

研究了用硅胶整体柱和直接电导检测的离子对色谱快速分析高氯酸盐的方法。

An ion-pair chromatographic method for the determination of Cr has been developed using a silica-based monolithic column and a conductivity detector.

研究了基于硅胶整体柱的离子对色谱快速测定Cr的方法，讨论了淋洗液浓度、乙腈浓度、流速、温度和pH等因素对分离的影响。

Hydrocarbon structural-group components in the hydrotreating of residual oils The residual oils were preseparated into 4 fractions by alumina/silica serial column A method for measuring the hydrocarbon structural-group components in saturated fraction, aromatic fraction, and resin fraction of residual oils was established using low resolution, high ionization voltage mass spectroscopy.

渣油加氢处理过程烃类结构族组成变化研究采用氧化铝/硅胶串联柱对渣油样品进行四组分预分离，建立了低分辨、高离子化电压质谱测定渣油饱和烃、芳烃和胶质组分烃类结构族组成的方法。

Results show that 4-oxo-β-ionone is the major product with yield of 53.5% under the conditions as follows: reaction temperature 45℃, reaction time 24 h, the molar ratio of n: n(NaClO3): n 20: 100: 3, and pH value of solution in 1-3; on the other hand, 5,6-epoxy-β-ionone is major product with yield of 25.4% when reaction temperature is 40℃, reaction time is 24 h, the molar ratio of n: n(NaClO3): n is 20: 120: 5, and pH values of solution is 3. The excessive β-ionone can be recovered by vacuum distillation for reusing again. 4-oxo-β-ionone and 5,6-epoxy-3-ionone were purified by recrystallization and silica gel column chromatograph respectively with the purity over 98%.

研究结果表明：氯酸钠氧化β-紫罗兰酮的反应主要生成4-氧代－β-紫罗兰酮和5，6-环氧－β-紫罗兰酮，经重结晶和硅胶柱层析分离，纯度高于98%；4-氧代－β-紫罗兰酮的有利合成条件是反应温度为45℃，反应时间为24h，溶液的pH值为1~3，反应物配比n：n(NaClO3)：n为20：100：3，最佳收率为53.5%；5，6-环氧－β-紫罗兰酮有利的合成条件是反应温度为40℃，反应时间为24h，溶液的pH值为3，反应物配比n：n(NaClO3)：n为20：120：5，其收率为25.4%；未反应的β-紫罗兰酮经减压蒸馏回收后可重复使用。

An orange-red crystalline substance was isolated from the chloroform extract of red callusdry powder by silica column chr

从干燥的红色愈伤组织中，用氯仿提取、硅胶柱层分离到一种橙红色结晶，经鉴定为隐丹酮。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。