查询词典 stoichiometric

According to the Box-Benhnken design principle,the method of response surface method with 3 factors and 3 levels was used. The factors influencing the technological parameters were determined by means of regression analysis. Response surfaces were finally graphed with the yield as the response value. The synthesis conditions were optimized as follows:reaction reagent was NBS,stoichiometric proportion between NBS and anhydrovinblastine was 1.07; the dosage of TFA was 22 mL/L; reaction temperature was －68 ℃ and duration was 90 min.

在单因素实验基础上，根据Box-Benhnken实验设计原理，采用三因素三水平的响应面分析法，研究了各个因素及其交互作用后，得到了合成7′-Br-脱水长春碱的最佳工艺条件：以二氯甲烷为溶剂，采用NBS为溴代剂，其用量与底物的物质的量比为1.07∶1，TFA的加入量22 mL/L，在－68 ℃下反应90 min，终止反应后，得到卤代产物。

Nitric oxide synthase catalyzes the stoichiometric conversion of L-arginine to NO and citrulline in the presence of oxygen and NADPH.

它是以精氨酸为底物，在一氧化氮合酶催化下产生的。

In this paper,the effect of stoichiometric ratio of anhydride/epoxide on thermal properties of curing products of epoxy resin was discussed.

研究了酸酐/环氧当量比 r对双酚A型E-44环氧树脂固化物耐热性能的影响。

The structural and electrochemical properties of the non-stoichiometric TiV-based hydrogen storage electrode alloys〓(x= 2～6) have been studied systematically.

对Zr替代Ti时钛钒基贮氢电极合金〓（x=0.2～0.5）的结构和电化学性能进行了系统的研究。

The stoichiometric ratio of air tomethane for idealised combustion is 9.52:1, with the basic combustion reaction

空气与燃料之间的最佳混合比率为9.52：1，反应方程式如下

The results indicated that BaCe0.8Ho0.2O(subscript 3-α) sinters are of single-phase structures of orthorhombic perovskite. In the temperature range of 600~1000℃, the nonstoichiometric materials (x=1.03 and 0.97) have higher conductivities in wet hydrogen and wet air and better performances of hydrogen-air fuel cells than the stoichiometric one (x=1). In this series, BaCe0.8Ho0.2O(subscript 3-α) has the highest conductivities 2.10×10^(-2Scm^(-1) in wet hydrogen, 3.46×10^(-2) Scm^(-1) in wet air, at 1000℃ and the maximum power output density 122 mWcm^(-2 at 1000℃.

结果表明，在600~1000℃温度范围内、湿润氢气和湿润空气气氛中，该系列材料的电导率随温度和钡离子含量的变化均与以该系列材料为固体电解质的氢－空气燃料电池性能随温度和钡离子含量变化的次序一致，即：非化学计量组成材料BaCe0.8Ho0.2O(下标 3-α)(x=1.03， 0.97)具有较化学计量组成材料BaCe0.8Ho0.2O(下标 3-α)(x=1)高的电导率和氢－空气燃料电池输出功率密度，其中BaCe0.8Ho0.2O(下标 3-α)有最高的电导率（1000℃时、在湿润的氢气气氛中：2.10×10^(-2)Scm^(-1)；在湿润的空气气氛中：3.46×l0^(-2)Scm^(-1)）和最大的氢－空气燃料电池输出功率密度（1000℃时：122mWcm^(-2)）。

Splitting the phase stability diagram into four topological structures and using the phase mark method, a new approach was built up to calculate the phase stability diagrams of ternary systems with stoichiometric binary and ternary compounds.

摘 要：概述了金属-Si-C体系界面反应和相稳定图的研究近况以及用Thermo-Calc软件计算相稳定图的局限性；阐明在相平衡条件下由化合物的Gibbs生成自由能计算活度的原理。

Therefore, from both the economic and environmental viewpoints, there is a definite need for catalytic oxidations employing hydrogen peroxide as the stoichiometric oxidant for hydrogen peroxide is environmentally friendly, cheap a...

因此，从经济和环境的双重角度来考虑，以环境友好，价格低廉的过氧化氢为氧源，采用催化氧化反应替代传统有机氧化过程是化工生产的发展趋势。

Therefore, from both the economic and environmental viewpoints, there is a definite need for catalytic oxidations employing hydrogen peroxide as the stoichiometric oxidant for hydrogen peroxide is environmentally friendly, cheap and rea...

因此，从经济和环境的双重角度来考虑，以环境友好，价格低廉的过氧化氢为氧源，采用催化氧化反应替代传统有机氧化过程是化工生产的发展趋势。

Five different mixing chamber geometries are tested experimentally with the stoichiometric gasoline-compressed air at frequency of 6 Hz and the effect of screw-pitch and inner diameter ratio on the performances of PDE is investigated.

实验针对爆震频率为6Hz、当量比为1的汽油和压缩空气混合气，实验研究了脉冲爆震发动机模型混合室内5种不同扰流螺纹螺距内径比对其性能的影响。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。