查询词典 aromatic

A woody Eurasian planthaving spikes of small blue flowers and aromatic leaves used in perfumery and as a condiment.

海索草一种象树木的亚欧植物，有一穗穗的小的蓝色的花，芳香的叶子用于制香水和用作调味品

A woody Eurasian planthaving spike s of small blue flowers and aromatic leaves used in perfumery and as a condiment.

海索草一种象树木的亚欧植物，有一穗穗的小的蓝色的花，芳香的叶子用于制香水和用作调味品

The aromatic oil in 33 samples of perilla collected from China and Japan is studied by using steam distillation.

采用水蒸气蒸馏法研究了中国和日本各地的33份紫苏试材芳香油的含量。

Results showed that under the conditions of a reaction temperature of 60 ℃,a reaction time of 6 h and a catalyst consisted of 1.0% BF3-ether and 1.5% AlCl3,the yields of aromatic solvent naphtha and petroleum resin...

结果表明，采用两段聚合法，在催化剂三氟化硼乙醚络合物质量分数1.0%、三氯化铝质量分数1.5%、聚合温度60℃、聚合时间6h的条件下，芳烃溶剂油收率为71.1%，石油树脂收率最高可达20%；同时所得的芳烃溶剂油切割为120号和200号溶剂油，指标达到行业标准。

Ethylene unit ; 9 carbon ; aromatic hydrocarbon ; solvent naphtha ; petroleum resin

乙烯装置； 9碳；芳烃；溶剂油；石油树脂

The adsorption and desorption behaviour of polycyclic aromatic hydrocarbons on different fractions was investigated using phenanthrene as model substrate.

研究了多环芳烃菲在不同粒级有机-矿质复合体上的吸附和解吸行为。

The internal and external development of p -aromatic polyamide fiber , particularly poly ( p -phenylene tereph-thalamide) fiber, was introduced from the aspects of fiber varieties, output, properties and advanced composite materials reinforced with this fiber.

介绍了对位芳香族聚酰胺纤维特别是聚对苯二甲酰对苯二胺纤维的国内外发展情况，包括纤维品种、产量、性能和该类纤维作为先进复合材料骨架的发展情况。

Therelationship of the amount of catalyst and the ee% of product was seen to be negative nonlin-ear. Catalyst 3 was used in the enantioselective addition of diethylzinc to aromatic aldehydesand gave good results. The configuration of products was determined by the configuration ofthe catalysts' chiral carbon linked with hydroxy group. Using β- amino alcohols bearing only one chiral center as catalysts for the enantiose-lective addition were studied. D-N, N-dialkyl-2-amino butanol gave poor catalytic effect be-cause of their structure. The configuration of the product is the same as the catalyst. Anotherkind of β- amino alcohols - phenylglycine derivatives and valine derivatives have chiralcenter on the carbon linked with amino group. Catalyzed by-phenylglycine derivatives 6,7, 9, 10, the reactions gave satisfied results. The optical yields exceeded 80%.

在探讨了含有两个手性中心的β-氨基醇之后，选择了只有一个手性中心的β-氨基醇，一是手性中心为连羟基的手性碳原子：D-N，N-二烷基-2-氨基丁醇；二是手性中心为连氨基的手性碳原子：D-苯基甘氨酸衍生物和L-缬氨酸衍生物。D-2-氨基丁醇的催化效果不太好，这与其结构的空间位阻较小有关系，反应产物与连羟基手性碳构型一致；由苯基甘氨酸和缬氨酸出发合成五种β-氨基醇6-10，研究了不同ee％的-6作用下的二乙基锌-苯甲醛加成反应，发现该催化剂具有不对称放大效应；-7，9，lO的催化效果也比较令人满意，光学产率80％以上，所得产物构型与催化剂构型一致。

Fluorescence-quenching experiments of HSA at 330 nm during a 40-min irradiation show aromatic amino acids such as tryptophan were destroyed along with the decrease of CL intensity during the course of photosensitization of HP.

辐照混合液40分钟过程中，HAS在330nm处的发光淬火实验表明HP的光敏化反应过程中色氨酸等芳香族氨基酸随著化学发光强度的降低被破坏。

A method for the determination of polycyclic aromatic hydrocarbons and phthalate esters in soil samples by gas chromatography-mass spectrometry was developed.

建立了气相色谱-质谱测定土壤中多环芳烃和酞酸酯类有机污染物的方法。

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％。