查询词典 isomers

The qualitative analysis of three kinds of aldehyde isomers has been reported.

本文介绍了三种醛异构体的GC－ MS测定，并对某些质谱开裂产物的产生机理进行了解

In chapter two, we demonstrated the separation of five ephedrine alkaloid isomers in NACE.

论文第二章中，首次建立利用NACE分离五种麻黄碱类生物碱异构体的方法。

In addition nC〓, nC〓, two isomers of C〓 sterene and three isomers of C〓 isoprenoid hydrocarbons were also identified from aliphatic fraction of pyrolyzed product at 200℃. After pyrolyzed at 300℃, the main aliphatic hydrocarbons were normal alkanes ranged from C〓 to C〓, with C〓 as the main peak and C〓 as the second main peak. Meanwhile, pristane, phytane and C〓 sterane were also detected. In the pyrolysates at 400℃ and 500℃, the content of saturated hydrocarbons decreased, the range of normal alkanes distribution became narrow and the main peak was nC〓. Low concentration of C〓-C〓 steranes was detected and the content of C〓-C〓 increased more.

在200℃热模拟产物饱和烃馏分中除检测出两种长链烯烃外，还检测到正十九碳单烯烃、正三十五碳双烯烃、两个碳二十八甾烯的同分异构体和三个C〓类异戊二烯烷烃化合物同分异构体。300℃模拟产物饱和烃主要为正烷烃，正烷烃的碳数分布范围为C〓-C〓，以C〓为主峰、C〓为次主峰；另外，样品中还检出姥鲛烷、植烷和C〓甾烷等化合物。400和500℃热模拟产物中的饱和烃含量下降，正烷烃系列碳数分布范围变窄，主峰碳后移至C〓，检测到低浓度的C〓-C〓甾烷系列化合物，另外，C〓-C〓藿烷系列化合物含量进一步增加。

The calculated results show that the X3+ cations each has two stable structures: the regular trigon(D3h) and the line with the regular trigon(D3h) being the ground state, while for three neutral X3Cl clusters, Sc3Cl has three stable isomers: the trigon-pyramidal(C3v), bidentate(C2v-1), and C2v-2 structures, Y3Cl and La3Cl each has only two stable isomers: the trigon-pyramidal(C3v) and bidentate(C2v-1) structures.

计算结果表明，三个X3+阳离子有两个稳定异构体：正三角型(D3h)和线型，其中正三角型为基态；对于三个中性的X3Cl团簇，Sc3Cl 有三个稳定的异构体：三角金字塔型(C3v)、双齿型(C2v-1)和 C2v-2型（图 1 e）；Y3Cl 和 La3Cl有2个稳定的异构体：三角金字塔型(C3v)和双齿型(C2v-1)。

The separation of optical isomers of 2, 2'-dihydroxy-1, 1'-binaphthyl and 2, 2'-diamino-1, 1'-binaphthyl was studied by reversed-phase high performance liquid chromatography on a chiral stationary phase consisting of-hydroxypropyl-β-cyclodextrin (Cyclobond Ⅰ 2000 SP)using methanol/water as the mobile phase. The effects of mobile phase ratio, flow rate and column temperature on separation of optical isomers of DHBN and DABN were investigated.

在S-羟丙基－β-环糊精手性柱(CyclobondⅠ2000 SP)上用反相高效液相色谱法研究了2，2'-二氨基－1，1'-联萘和2，2'-二羟基－1，1'-联萘光学异构体的分离，考察了流动相组成、流速以及柱温等对联二萘胺和联二萘酚光学异构体分离的影响。

Our calculated results show that the relative stability of the isomers depends on the level of theory used: in the framework of DFT, Au10 trends to form planar structures, while the MP2 calculations show that the three-dimensional isomers are energetically more favorable. Based on the present results, Au10 may be conjecturably a critical species of gold clusters which bridges the planar structures and three-dimensional ones.

计算结果表明Au10团簇异构体的相对稳定性明显依赖所使用的理论方法和泛函，密度泛函结果显示Au10倾向于采用平面结构，且不同的泛函给出异构体的相对稳定性次序也不相同，而MP2计算则显示三维空间结构的Au10团簇更稳定， Au10可能是金团簇从二维结构到三维结构演化的一个临界点。

The equilibrious geometries and electronic structures of possible isomers of Si4N4 clusters are studied by using density functional theorywith basis sets 6-31G*.17 possible isomers are obtained.

用密度泛函理论中的杂化密度泛函B3LYP方法，在6-31G的水平上对Si4N4团簇的可能结构进行了几何结构优化和电子结构计算，得到了可能的17个异构体。

By means of molecular designing, a series of sodium branched-alkyl benzene sulfonates weresynthesized through seven process, involving Frieded-Crafts reaction, Grignard reaction, sulfonationand neutralization. Those isomers have similar structure, carbons of same quantity, but the position ofalkylaryl dissimilarity. Liner fat acid, metaxylene and halogenated hydrocarbon of different carbonnumber were used as the starting materials. Optimum processing condition was confirmed consideringinfluence of a series of reaction factors such as feed proportioning, quantity of catalysts, quantitysolvent, reaction time, temperature and pressure. Eight kinds of isomers of sodium hexadecylxylolsulfonates were finally synthesized, and characterized by FT-IR.

本文通过分子设计，以不同碳数直链脂肪酸、间二甲苯以及不同碳数的卤代烷为原料，经酰基化、格氏反应、加氢还原、磺化及中和等反应，合成了结构相似、烷烃链碳数一定、芳基在烷烃链不同位置的烷基芳基磺酸盐同分异构体；并考察了原料配比、催化剂用量、反应时间、反应温度、溶剂用量、反应压力等一系列因素对各反应的影响，进而确定最佳工艺条件，最终合成出十六烷基二甲苯磺酸钠的八种同分异构体，利用 FT-IR 对产物结构进行了分析。

Mol〓. As the result, some sensitizers have obviously sensitive effect, the ratio of / in photostationary state was change, We designed two methods, One of them is that isomers were synthesized, then we obtained the mixtures of isomers via photoisomerization.

本论文试图由两种方法获得-O-烃基-α-氧代环十二酮肟，一种是由体的肟通过化学合成得到体的O-烃基-α-氧代环十二酮肟，再通过光化学反应得到其体；另一种是由-α-氧代环十二酮肟，通过光化学异构合成体，再由体肟化学合成得到-O-烃基-α-氧代环十二酮肟。

The bioassays showed that the inhabitation rate of the mixture of two isomers, Z isomer and E isomer were reached 95%, 100% and 97% against Sphaerotheca fuliginea at 50 mg/L. The inhabitation rate of them was similar, so the mixture of the two isomers can be used without separation.

结果表明，当处理剂量为50 mg/L时，氯苯肟唑、Z-氯苯肟唑和E-氯苯肟唑的防效分别为95%、100%和97%，三者活性基本相当，故在实际中无须将两个异构体分离，混合体可直接应用。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。