查询词典 token ring

It is shown that (1 )the metastatic foci in the cerebellar hemisphere manifested cystiform ring of low density and contrast enhanced band

该文通过对54例幕下转移瘤病灶的分析，认为：小脑半球的转移思 CT表现为囊性低密区环和高密度强化带

Based on the scheme, we have fabricated successfully many phase elements in LiNbO3: Fe, such as photorefractive phase mask, phasing zone plate, lens array, Daman grating and array waveguides, ring and elliptic waveguides and so on.

按照此方案，我们在LiNbO3：Fe晶体中成功制作了光折变位相图、相位型波带片、透镜阵列、达曼光栅及阵列波导、圆形及椭圆形波导等位相元件。

The proposition of reaction pathway suggested that the initial degradation of pyridaben proceed via C-S bond cleavage between phenyl ring and heterocyclic group, and then promote a serious of reactions such as substitution, oxidation and dealkylation.

反应路线推导表明降解哒螨酮首先是在苯环与杂环之间C-S键处断裂为两个部分，接着发生取代、氧化，去烷基等系列反应。

The paper reviews the progress of ionic liquids as microwave mediums or catalysts in the fields of organic synthesis, mainly including cyclization, nucleophilic substitution, ring closing metathesis, acylation, rearrangement, polymerization, coupling, oxidation and reduction as well as selective debromination, etc.

本文综述了以离子液体为反应介质或催化剂的微波辅助技术在多种类型有机反应中的研究成果，主要包括了环合反应、亲核取代反应、金属复分解反应、酰化反应、重排反应、聚合反应、偶联反应、氧化还原反应和选择性脱溴反应等。

In this research FGA was synthesized through total ten steps such as epoxidation via H2O2, carbonyl protection, LiAlH2 reduction、carbonyl deprotection, epoxidation and ring opening with HF, oxidation, bromination and debromination et al.

设想通过对蕃麻二烯物进行H2O2环氧化、羰基保护、LiAlH4还原、羧基脱保护、溴羟环氧、HF开环、氧化、上溴脱溴等一系列反应得到FGA。

Results: The main reasons for a change to the piggyback lens were excessive scar ring (40%) and the decentration of HCL (35%).

结果：圆锥角膜变更使用Piggyback Lens 的主要原因是角膜混浊、瘢痕的加重（40%）和单独使用HCL稳定性差，易脱落（35%）。

The intermediate decyl-glycidol ether of Gemini phosphate surfactant was synthesized with decanol and epichlorohydrin in the presence of phase-transfer catalyst; the intermediate decyl digomeric glycol of Gemini phosphate surfactant was prepared by opening ring reaction of decyl glycide ether and glycol in the presence of potassium as catalyst; and the influence of type and dosage of phase-transfer catalysts was studied.

以正癸醇与环氧氯丙烷为原料在相转移催化剂存在的条件下合成Gemini磷酸酯表面活性剂的中间体I-正癸基缩水甘油醚，讨论催化剂种类及用量对反应的影响；以乙二醇和正癸基缩水甘油醚为原料，金属钾为催化剂合成Gemini磷酸酯表面活性剂的中间体Ⅱ-正癸基低聚二醇，讨论催化剂种类与用量对反应的影响；以P2O5与正癸基低聚二醇为原料合成Gemini磷酸酯表面活性剂，讨论投料比、反应温度和反应时间等因素对反应的影响。

The results indicate that the first ten step natural frequency range from 233.2Hz to 526.8Hz, the natural frequency is higher than the value specified by the standard.6. The profile equations of shaping gear ring are deduced out by profile normal line method. The involute and transition curves are automatically generated through the macro function in Solidworks. And the three-dimension model is built. Based on the three-dimension model, the deformation and dedendum stress is studied.

6应用齿廓法线法推导出了插齿加工的渐开线直齿内齿圈的精确齿廓曲线方程，并通过Solidworks中的宏功能采用Visual Basic语言编程实现了内齿圈齿廓渐开线以及齿根过渡曲线的自动生成，建立了内齿圈的精确三维实体模型，研究了内齿圈的轮齿变形及齿根应力。

Then a hexacyclic-ring system formed as a result of molecular recombination, based on which further dehydrogenation occurred.

然后经过重排又转变成了一个具有碳碳双键的六员环体系，并在此基础上进一步发生脱氢反应。

In the second part of this thesis, a formal [2+2] cycloaddition ketenes and dialkyl azodicarboxylates was studied. We found that by adjusting the substituents in the diazenes, the reaction mode can be completely switched, and furnish four-membered-ring products, aza-b-lactams, the enantioselectivity was up to 91%.

经研究发现，通过对偶氮化合物取代基团的改变，我们可以实现[4+2]环加成反应到[2+2]环加成反应的转变，在手性氮杂环卡宾的作用下，对具有各种取代基的烯酮都可以很好的产率得到氮杂b-内酰胺，其对映选择性最高可以达到91%。

Analog output can display output results.

可以模拟输出显示输出效果。

It implied that RAPD technique pro vided a new alternative for checking irradiation induced effects.

对扩增产物进行数据分析，结果表明RAPD技术能够检测出辐射后唐菖蒲基因组变异情况，可用于对唐菖蒲辐射后基因变异的分析。