查询词典 selectivity

Selectivity for γ-butyrolactone can be obtained.

在此反应条件下，顺酐的转化率为100％，γ-丁内酯的选择性为91.9％。

Over 5.4％CuO-10.8％NiO/TiO〓-Al〓O〓 catalyst, about 100％ selectivity to γ-butyrolactone at 100％ conversion of maleic anhydride was obtained at 200-270℃.

如使用5.4％CuO-10.8％NiO/TiO〓-Al〓O〓催化剂，在200-270℃，顺酐完全转化，γ-丁内酯选择性约为100％。

Experimental principles, instruments and techniques of studies based on selectivity recognition of calix [4] arene derivative complexing with metal ions, especially to some transition metals were described.

阐述了杯[4]芳烃衍生物对金属离子特别是过渡金属离子选择性识别的实验方法和原理。

The reaction of carbodiimide 14 with various neucleophiles was investigated. The selectivity of cyclization of the carbodiimide 14 with NH_3, RNH_2, R_2NH and NH_2NH_2 were studied, some of the gualidene-type intermediates were isolated and the possible mechanism was suggested.

探讨了碳二亚胺14与各种亲核试剂如NH_3、RNH_2、R_2NH以及水合肼的成环反应的选择性，并分离得到了部分胍中间体，提出了反应可能的机理，对反应的选择性进行了合理的解释。

Therefore, the development of novel catalytical system for C-N bond forming reaction with high yield and high selectivity was highly desired.

因此，需要发展新型的、高收率、高选择性的C—N键形成的催化体系。

This method not only operates simply and reacts warmly, but also realize 100% conversion of α-cedrene and 84% selectivity of the target product.

该方法不仅具有操作简单，反应条件温和的特点，而且实现了α-柏木烯的百分百转化，使目标产物的选择性达到84%以上。

Results showed that chloroacetic acid was the best reagent for esterification and the catalyst had satisfactory catalytic activity and selectivity.

实验结果表明，氯乙酸是最佳酯化剂，催化剂具有较强的活性及选择性。

Results: The selectivity and the specificity of HKSal were the same as other two chromogenic media.

结果：3种显色培养基均具有良好的选择性及特异性；在对7株质控菌、人工污染样品和实际样品检测中，HKSal、ZWSalI和ZWSalII沙门菌显色培养基与经典培养基SS和DHL可以达到相近的检测限和灵敏度。

During liquid phase hydrogenation of cinnamaldehyde at atmospheric pressure, the Ru-B catalyst prepared exhibited excellent selectivity to cinnamyl alcohol.

Ru-B催化剂在肉桂醇液相常压加氢中显示出较高的肉桂醇选择性。

When the hydrogenation was performed with ultrasonic irradiation, the reaction rate could be greatly enhanced while the selectivity to cinnamyl alcohol remained almost unchanged.

在加氢过程中使用超声辐射能大大提高反应速率而肉桂醇的选择性几乎保持不变。

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％。