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a structure
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  a结构
    The tensile strength, elastic module as well as elongation at break of PU network can be improved appreciably by introducing 5-10 phr polyol with bisphenol A structure into PU networks.
    在聚氧化丙烯聚醚多元醇中添加 5 - 10 phr双酚A结构的多元醇就能显著地提高聚氨酯网络的拉伸强度、弹性模量和断裂伸长率
短句来源
    The azo compound of 2 Hydroxy 5 (4 sulfo phenylazo) benzoic acid ethyl ester which has D π A structure was designed and synthesized.
    设计合成了具有D π A结构的偶氮化合物 2 羟基 5 (4 磺酸基偶氮苯 ) 苯甲酸乙脂
短句来源
    A new compound with D-πA structure was synthesized from 4-methylpyridine and 4-imidazolylbenzaldehyde which was obtained by the reaction of imidazole with 4-fluorobenzaldehyde. The structure was characterized by UV,~1H NMR,IR,MS and elemental analysis.
    以咪唑和对氟苯甲醛为原料,合成了咪唑苯甲醛; 咪唑苯甲醛与4-甲基吡啶反应得到一种新型的含D-π-A结构的化合物,其结构经UV,1H NMR,IR,MS和元素分析确证。
短句来源
    N -(4 - hydroxyphenyl)maleimide has been synthsized and used as a starting reactant to synthesized a new bismaleimide containing silicon oxygen bond and bisphenol A structure. This new kind of bismaleimide has remarkable melting point and may be used as a thermal melting resin. This bismaleimide was characterized by element analysis,H - NMR, and thermal analysis.
    合成了N—(4—羟基苯基)马来酰亚胺,并以此为起始物合成了含有硅氧键及双酚A结构的双马来酰亚胺(C_(39)H_(38)N_2O_8Si_2).这种新型双马来酰亚胺具有明显的熔点,可以作为热熔型树脂.并采用元素分析、~1H—NMR及热分析方法对其进行了表征.
短句来源
    A kind of polyol with bisphenol A structure was synthesized and characterized. The polyurethane (PU) networks with bisphenol A segments were prepared through adding this polyol with bisphenol A structure into poly(oxypropylene) polyol.
    首先合成与表征了一种含有双酚A结构的多元醇 ,通过添加这种多元醇至聚氧化丙烯聚醚多元醇中合成了含有双酚A链段的聚氨酯网络。
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  “a structure”译为未确定词的双语例句
    In pulp, this product can make a structure with fiber and strengthen the strength among fiber, therefore, the strength of paper or paper boxes can be improved.
    三种改性产品应用试验表明:控制纸浆pH值为4.5~5.5,增强剂用量为6%时,纸页抗张强度最大,可分别提高纸页的干强度为33.8%、59.1%、63.4%,而且纸页润湿后,其湿强度保持为干强度的40.2%、38.8%、42.5%。
短句来源
    Parent cyclodextrin has a certain chemical stability, and it has a cavity which could be a combination of host or guest objects, but it has some limitations, therefore how using cyclodextrin as a structure to build all kinds of moleculors has become an important research topic in the cyclodextrin chemistry fields.
    母体环糊精具有一定的化学稳定性,尽管具备一个空腔,可以作为结合底物或客体分子的位点,但有一定的局限性,因此,如何用环糊精分子作为骨架建筑各种分子,成为环糊精化学的一个重要研究课题。
短句来源
    Devices with a structure of glass/indium-tin oxide/arylamine derivative/ tris(quinolinolato)aluminum(III) (Alq)/TMCD/LiF/Al exhibited green emission from the Alq layer with external quantum efficiency of 0.84 % and luminous efficiency of 1.3 lm/W.
    评价的结果显示:该有机电致发光器件在538nm的绿色发光来源于Alq层. 它的最大外部量子效率为0.84%,视感效率为1.30lm/W.
短句来源
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  a structure
In this paper we prove that the homogeneous spaceG/K has a structure of a globally symmetric space for every choice ofG andK, especially forG being compact.
      
Similarly, by a specific choice of the parameter, the level (1,0) vertex representation of the quantum totoidal algebra gives rise to a structure on irreducible level-1 highest weight-modules.
      
A structure iterated by the unbalanced Feistel networks is introduced.
      
Acoustic-structure sensitivity is used to predict the change of acoustic pressure when a structure design variable is changed.
      
However, the appearance of imaginary frequency phonon modes indicates the instability of such a structure.
      
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This paper studies the synthetic kinetics of methyl tert - butyl ether from methanol and isobutene, which contained in mixed C4-hydronarbon. The catalyst used in this study is the so-called S-type-strong acidic-cation resin calalyst with a structure of large pores. It is selected by the Scientific Research Institute of Qi-Lu Oil company, and regarded as being the superior one to others available. The kinetics experiments have been carried at 15 atmospheres and under a variety conditions, of which the mole...

This paper studies the synthetic kinetics of methyl tert - butyl ether from methanol and isobutene, which contained in mixed C4-hydronarbon. The catalyst used in this study is the so-called S-type-strong acidic-cation resin calalyst with a structure of large pores. It is selected by the Scientific Research Institute of Qi-Lu Oil company, and regarded as being the superior one to others available. The kinetics experiments have been carried at 15 atmospheres and under a variety conditions, of which the mole ratios of methanol to isobutene, which contained in the mixed C4-hydrocarbon with a content about 40% wt., are ranged in 1.25 to 1.0, and the temperatures in 50 to 90℃. The kinetic rate equation has been demonstrated anh can be expressed byThe parameters in the equation have been also examined and determined.The experimental data obtained from a single tube reactor with a size of liter order have been compared with those by means of the kinetic rate equation presened. The results indicate that the present kinetic model can be used satisfactorily to describe the behaviors for the studied reaction system in a fixed-bed reactor. It is, in turn, believed thai the conclusions given by this study may be used in the scale-up for chemical reactors.

应用齐鲁石化总公司科研所筛选出的具有良好性能的S型大孔强酸性阳离子交换树脂为催化剂,研究了在50~90℃和15atm条件下,以混合碳四中异丁烯(约40%重)和甲醇在醇/烯克分子比为1.25和1时的反应动力学,得出该反应的动力学速度式为 -r_A=k_1C_A-k_2C_M并求得了该反应的有关动力学参数。 通过立升级单管试验对动力学模型进行了考核,结果表明所提出的动力学模型能描述该反应系在固定床内的反应性状,因此本研究结果可供反应器数模放大之用。

The phenomena of compatibility is not only in the blendings of two different polymers,but also in the random copolymerisation of different monomers.It is found by the exeperiment that 2EHA-VAC copolymer system has a structure of two phases because of the transfer reaction to VAC which causes to deviate from a calculated value of the theory equation in measuring a glass temperature(Tg)

两种高分子掺和在一起,有相容性问题,两种不同单体无规共聚反应也会有相容性问题。实验发现,2-EHA和VAC共聚体系中由于大分子链转移反应特点,存在着两相结构,构成玻璃化温度实测值对理论值的偏差。

The changes of crystalline phasd of Nylon-6 at various spinning speed, drawing and heat history were studied by wide-angle X-ray diffraction(WAXS). Crystalline phase is mainly a+h structure at low spinning speed and mainly V structure at the speed as high ate 4400m/min, The Y structure is stable in heat treatment, but the hstructure can be transformed to a structure completely by heat treatment, the Y+h structure can be changed to a structure by drawing.

本文用X衍射方法,研究了不同纺速下锦纶-6的晶态变化,探讨了拉伸、热定型对其晶态变化的影响。在低速纺下,主要是α晶态及拟六方h晶态;在高速纺下,如4400米/分POY,主要呈γ晶态。γ晶态对热是稳定的,而h晶态在热处理时可以完全转变为α晶态。拉伸可以使γ+h晶态转变为α晶态。

 
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