查询词典 stoichiometric

When the causticization time was longer than 120min and higher than 80℃ with 1.1:1 of stoichiometric ratio, and the precipitation was longer than 30min at 80℃ with n:n(Na2S) being 1.45:1, the NaOH concentration after reviving was denser than 8%, and the revived caustic approximately had the same physical property and adsorption of CO2 as the new caustic.

结果表明：苛化反应温度大于80℃，反应时间超过120 min，n：n(Na2CO3)为1.1：1， CuO沉淀反应温度为80℃，反应时间30 min，n：n(Na2S)为1.45：1等条件下，再生后的NaOH含量可在8%以上，并且再生碱液的物性以及再生碱液对CO2吸收速率上与新鲜碱基本相同。

The results indicate that polyborazine precursor prepared at 150℃ for 10 h and propylamine/isopropylamine molar ratio 2:1, could possess nearly linear molecule skeleton and he prone to melt spinnability. When melt at 90℃, the precursor fibers are prepared with average diameter 10-20μm and BC1.27 N1.52 H structure. After curing process and sintered in NH3 at 1200℃, the near-stoichiometric BN fibers was obtained, which proved this precursor is apt for preparation of BN fibers.

结果表明，当正丙胺／异丙胺摩尔比为2：1，聚合温度为150℃，反应时间为10h时，合成产物具有近似线性分子结构，熔点为90℃，具有良好的成丝性，可获得平均直径10~20μm，组成为BC1.27N1.52H的先驱体纤维，先驱体纤维再经不熔化处理及1200℃氨气高温锻烧等工艺可获得近化学计量比的氮化硼纤维。

Metabolic flux analysis for the logarithmic phases of photoautotrophic and mixotrophic growth of Anabaena sp. PCC 7120 in an airlift photobioreactor was accomplished by using the stoichiometric model.

利用此计量关系模型，对鱼腥藻7120细胞在气升式光生物反应器中光自养和混合营养生长的对数生长阶段进行了代谢通量分析。

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

The relation of light intensity and the domain switching voltage of the near-stoichiometric Mg-doped lithium niobate was studied.

摘要研究了在可见光诱导条件下的近化学计量比掺镁铌酸锂的反转电压与光强之间的关系。

For very long time, many research groups focus on using more than a stoichiometric amount of a chiral auxiliaries to obtain high enantioselectivity. There were mainly two sorts of processes reported on highly catalytic asymmetric addition of Grignard reagents to aldehydes. The former case was to transform Grignard reagent RMgX into other organometal reagents such as R_2Zn and R-Ti derivatives via complicated procedures at extremely low temperature. The later case was to link a chiral ligand to Mg in the form of organomagnesium amides or use chiral amine ligand catalyzing the alkylation of aldehydes.

格氏试剂对醛的不对称加成的报道大多需要大量的手性助剂以获得高的光学活性，而高度催化的格氏试剂对醛的不对称加成主要通过两种途径进行：一种是把格氏试剂转化成其他的有机金属试剂如R_2Zn和R-Ti化合物再对醛进行加成，反应通常在低温下进行；另一种是利用手性镁胺作为中间体或直接用手性胺催化来完成此反应。

However, in actual practice, the relative quantity of ethyl orthosilicate to hydroxysiloxane used is always many times larger than the stoichiometric ratio.

将硅橡皮分别在空气及氮气中进行高温处理，并测定其溶胀度的变化的结果，证明这现象是由于硅橡皮在高温下发生降解及氧化所致。

It is found from calculated results that different volatile compositions,stoichiometric ratio and temperature in the reburn...

通过计算发现，不同的挥发分组分、再燃区空气过量系数及再燃区温度对 NOx 的还原过程和还原率都有重要的影响

The effect of some key factor such as reburn zone temperature,stoichiometric coefficient and reburn rate on NOx formation regulation was studied on a one-dimensional test system with multi-function such as air stage and fuel reburning.

燃料型NOx是主体，约占75%～80%，燃料型NOx又可以分为挥发分NOx和焦炭NOx，在这两部分中挥发分NOx是主要部分，它在燃烧初始阶段形成。

For struvite precipitation, at the optimum operating conditions of pH 9 and MAP stoichiometric ratio of 1:1:1, ammonium nitrogen and COD levels were reduced by as much as over 97.0% and 50.0%, from 2132 mg l-1 and 4113 mg l-1 to 46 mg l-1 and 2057 mg l-1, respectively.

结果发现，对于MAP沉淀法，pH值为9、Mg2+：PO3-4：NH+4比例为1：1：1时，NH+4-N和COD的去除率分别在97.0%和50.0%以上，浓度分别从2132 mg l-1和4113 mg l-1降低到46 mg l-1和2057 mg l-1。

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。。。。