不对称

The paper analyses the cooling process of symmetrical and dissymmetrical section profile with FEM software ANSYS, then adopt the data to guide the design of moulds cooling system.

使用有限元分析软件ANSYS分析了对称截面和不对称截面两种型材在定型模内冷却的过程，并采用分析得出的数据指导定型模冷却系统的设计。

Elegans ortholog of the transcription factor Engrailed, controls symmetric and asymmetric division of stem cell-like seam cells.

在ceh-16功能缺失的突变体中，原本应该进行对称分裂的侧线细胞会异常而进行不对称分裂，而且如果在ceh-16突变体中导入人的同源基因 En2能够回复这种异常表型，说明ceh-16的这种调节功能在进化过程中是十分保守的。

For both series of heteroleptic tris rare earth compounds, the characteristic phthalocyanine dianion IR bands for Pc2- and O OPc2- at ca. 1329 and 1380 cm-1 attributed to the pyrrole stretching and the symmetric C-H bending of -CH3 groups in octyloxy side chains of OOPc rings together with some small contribution from the isoindole stretching vibrations,re specteively,are simultaneously found in their IR spectra.

在这两个不对称三明治型稀土配合物系列的红外光谱中发现了这样一种特性，即酞菁阴离子Pc~(2-)和OOPc~(2-)的特征波段在1329cm~(-1)和1380cm~(-1)之间，这是因为吡咯的伸缩振动和OOPc环中八烷氧基侧链上-CH_3基团的对称C-H的弯曲振动共同作用于吲哚环的伸缩振动。

Besides,two fertile hybrids were obtained from symmetric somatic hybridization between bread wheat and tall wheatgrass,both of which were phenotypically similar to the tall wheatgrass parent.

本实验室成功的进行了小麦与多种禾草的体细胞杂交，并在小麦与长穗偃麦草的对称与不对称体细胞杂交中分别获得了长穗偃麦草/小麦渐渗系和小麦/长穗偃麦草渐渗系。

The aluminium powder has been used to reduce titanium tetrachloride to generate the low valent titanium reagent which can induce the reductive coupling of aldehydes and ketones to form the corresponding pinacol s.

以价廉易得的铝粉还原四氯化钛制得低价钛，将其用于醛酮还原偶联，合成了6种片呐醇，其中对称片呐醇4种，不对称片呐醇2种。

Four symmetrical and asymmetrical pyrylium - squarylium cyanine dyes were synthesized.

合成了四个对称及不对称含叔丁基吡喃鎓方酸的菁染料，通过光谱和元素分析确定其结构，测定了它们的紫外-可见吸收光谱、熔点和溶解性能。

The subregular solution model and the modified version of Toop's method are expected to be suitable for calculating a series of assymetric ternary molten salt systems of potential interests, such as NaCl-CaCl_2-BaCl_2,NaCl-SrCl_2-BaCl_2,NaCl-CaCl_2-MgCl_2,KCl-CaCl_2- MgCl_2,KCl-NaCl-CeCl_3 and so on.

亚正规溶液模型和新的非对称方法可望适合于计算一系列有潜在重要性的电荷不对称熔盐体系的相图。如对 Na，Ti，Mg，Ce 电解及熔融氯化脱水制取无水氯化镁有实际意义的 NaCl-CaCl_2-BaCl_2，NaCl-SrCl_2-BaCl_2，NaCl-CaCl_2-MgCl_2，KCl-CaCl_2-MgCl_2，KCl-NaCl-CeCl_3等三元相图。

Results Abnormal signal lesions were found in 47 patients with viral encephalitis, including multiple or single, symmetrical or asymmetrical large patch shape lesions, the located mainly in cortices, subcortical and basal ganglia and thalami. The lesions carried long T 1 and long T 2 on MRI. Enhanced MRI was performed in 22 cases, and demonstrated abnormal enhancement in 11 cases, including large patch or gyrus shape enhancement in 7 cases.

结果 病毒性脑炎脑内有多发或单发的对称或不对称大片状病灶，主要位于皮层、皮层下及基底节丘脑区，MRI呈长T1 长T2 信号，增强扫描22例，显示病灶强化者11例，其中呈大片状或脑回状强化者7例。

Furthermore, this paper develops a practically seismic design method of the middle-rise or low-rise symmetric structures with unsymmetrically viscous dampers on the basis of the theoretical analysis and provides corresponding formulas to obtain the translation-torsion coupling seismic response.

此外，在理论分析的基础上进一步提出了中低层对称结构不对称安装粘滞消能器时的实用抗震设计方法，推导出了相应的平扭耦合地震作用的计算公式。

A general novel synthetic method to Symmetrically or unsymmetrically 2,3,6,7- substituted thieno[2,3-d:5,4-d\']dipyrimidine-4,5(3H,6H)-diones and 2-substituted benzothieno[3,2-d] pyrimidin-4(3H)-dione by utilizing aza-Wittig reaction was proposed firstly. This synthetic method has the advantage of easily accessible starting material, mild condition and good yields.

具体研究内容如下：1、首次研究了应用aza-Wittig反应方法合成2，3，6，7-对称与不对称四取代噻吩并[2，3-d；5，4-d\']双嘧啶-4，5(3H，6H)-二酮以及2-取代苯并噻吩并[3，2-d]嘧啶-4(3H)-酮衍生物的通用新方法，该方法原料易得，条件温和，收率较高。

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％。