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临界
    很抱歉,暂未找到该词条在当前类别下的译词。您可以查看在所有学科下的译词。
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  “临界”译为未确定词的双语例句
    Physical Property Data of Hydrocarbons and Their Denatives and Correlations (Part 4)
    烃类及其衍生物的物性数据和关联方法(4)——临界性质、蒸气压、水中溶解度、生成自由能
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    A COMPARISON OF HIGH PRESSURE PHASE EQUILIBRIA AND ORITIOAL PHENOMENA FOR AQUEOUS C_4-ALKANE-SYSTEMS WITH OTHER ALKANES SYSTEMS
    含水C_4烷烃系统高压相平衡和临界现象与其他含水烷烃系统的比较
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    The results were supported by characteristic change of UV-Vis absorption spectra of the derivatives 3 and 4 at the neighborhoods of CAC.
    这一结果被C60吡咯烷衍生物3和4,在临界聚集浓度(CAC)附近的UV-Vis光谱的特征变化所支持.
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    The aggregation behav- ior of 3 and 4 was also examined using static light scattering (SLS) and transmission electron microscopic (TEM) techniques, and the aggregate sizes of derivative 3 (radius Rg ~21 nm) in a buffer solution (0.001 mol/L Na2CO3-NaHCO3) were found to be different from derivative 4 (radius Rg ~21 nm).
    透射电子显微镜(TEM)和静态光散射(SLS)等方法也被用于检测C60吡咯烷衍生物3和4在临界聚集浓度(CAC)时的聚集行为,结果显示,C60吡咯烷衍生物3在缓冲溶液中(0.001mol/LNaCO3-NaHCO3),其聚集体粒径的大小(Rg≈21nm)不同于C60吡咯烷衍生物4(Rg≈23nm).
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    We also find that the relationship between D-c and N as D-c-Nλ,here λ0.543.
    同时临界值Dc与链长N有关,Dc~Nλ,其中λ=0.543,并进行了一定的理论分析.
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The sound velocity in a fibre shows a pronounced anisotropy, that is, the sound velocity along the axis of an oriented fibre is much greater than that perpendicular to it, and therefore it may be used as a measure of the molecular orientation α in the fibre,α= 1 - Cα2/C2where C and Cu are velocities of sound along an oriented fibre and a completely un-oriented fibre respectively.The apparatus used consisted of a pulse generator which sends a pulse of 70 μsec duration with a repetition frequency of 100 times...

The sound velocity in a fibre shows a pronounced anisotropy, that is, the sound velocity along the axis of an oriented fibre is much greater than that perpendicular to it, and therefore it may be used as a measure of the molecular orientation α in the fibre,α= 1 - Cα2/C2where C and Cu are velocities of sound along an oriented fibre and a completely un-oriented fibre respectively.The apparatus used consisted of a pulse generator which sends a pulse of 70 μsec duration with a repetition frequency of 100 times per second to the moving coil of a loud speaker. The fibre was coupled to the vibrating membrane through a spring clamp. When exited by the pulse, the system underwent damped oscillation with a natural frequency of about 4000 Hz. At the other end of the fibre, about 200 cm from the clamp, a crystal pick-up was located, the output of which was sent to an oscilloscope with the sweep circuit triggered by the pulse voltage. The time of propagation of the longitudinal vibration along the fibre from the clamp to the pick-up was observed from the oscilloscope record, and the sound velocity in the fibre calculated.Since the mechanical properties of fibre depend considerably on the moisture regain and tension, the effect of relative humidity and tension in the fibre on the sound velocity were studied.The best choice of the experimental conditions for the determination of molecular orientation by the sound velocity method appears to be the following: room temperature, 28 - 30℃; relative humidity, 60%; and under a tension somewhat below the critical Young's modulus of the fibre.The sound velocities in the fibres of different draw ratios (r) were determined and extrapolated to r = 1 to give the value for Cu. Experimental results indicate that the degree of molecular orientation of monofils of Nylon 6 increases to approximately 80% after drawing and after-treatment.The degree of orientation for several products of Nylon 6 fibre such as yarns, monofils, and cords was determined. Fibres that possess greater breaking length show higher degree of orientation.

纤维具有声学的各向异性,声波通过纤维的速度与纤维中高分子链的取向程度有关。测定声波沿纤维轴方向的传播速度可以计算纤维的取向度α: α=1-C~2_u/C~2其中C及C_u分别为声波通过取向及无规取向纤维的速度。 实验仪器采用每秒100次的脉冲电流输至高音喇叭的音圈,纤维通过弹簧夹子与喇叭振膜的中心相耦合。脉冲电流激发喇叭振膜振动系统,使产生逐渐衰减的固有频率振动(约4000赫)。离振源200厘米处的纤维另一端有拾音器,其输出讯号接至由脉冲电压触发扫描的脉冲示波器,从示波器可以观察到从振源到拾音器的距离间声波在纤维中的传播时间,由此计算出声波通过纤维的速度。 纤维的吸湿性与所受张力不同对其力学性貭均有影响,因此研究了相对湿度与张力对纤维中声速的影响,并选择了在室温(约30℃),相对湿度为60%和在小于纤维的临界杨氏模量的作用张力下进行声速法测定纤维的取向度。 研究了不同拉伸程度单纤维样品的声波传播速度,并外推到长度拉伸比为1时作为声波通过无规取向纤维的速度。实验结果表明,尼龙6纤维的取向度经拉伸与后处理逐渐增大至80%左右。 测定了不同品种的尼龙6纤维的取向度,具有较大强度的纤维其取向度较大。

By the direct radiation grafting techonique, kinetics of the Gamma-induced graft copolymerization of st-AA to polytetrafluoroethyene has been studied at 20°-40℃. Dependence of the grafting temperature on the critical radiation intensity has been found. Above a given critical radiation intensity, the grafting is limited to the surface. Below that intensity, the grafting proceeds in the mass. Optical microscope and scanning electron microscope were used to study the structure of the cross section and surface of...

By the direct radiation grafting techonique, kinetics of the Gamma-induced graft copolymerization of st-AA to polytetrafluoroethyene has been studied at 20°-40℃. Dependence of the grafting temperature on the critical radiation intensity has been found. Above a given critical radiation intensity, the grafting is limited to the surface. Below that intensity, the grafting proceeds in the mass. Optical microscope and scanning electron microscope were used to study the structure of the cross section and surface of the grafted film. The grafted amount of the surface grafted film is about 1 mg/cm2, thus, the average adhesive strength is found to be above 100 kg/cm2. The electrical properties of the surface grafted film are the same as those in nongraft film. This indicates that the Gamma radiation-induced surface graft copolymer of at-AA to polytetrafluoroethyene could be used as constructional material with strong adhesive strength or as adhesive sealing material of the electronic parts.

本文采用共辐照工艺,在20°—40℃范围内研究了聚四氟乙烯辐射引发接枝苯乙烯-丙烯酸的动力学。找到了接枝温度与临界辐照强度的关系。高于临界辐照强度,接枝发生在表面,反之,接枝发生在整体。借光学显微镜和扫描电子显微镜研究了接枝膜的断面和表面结构。表面接枝膜的接枝量约1毫克/厘米~2,平均粘结强度高达100公斤/厘米~2以上。表面接枝膜的电性能与未接枝的聚四氟乙烯相仿。可知聚四氟乙烯表面辐射接枝苯乙烯-丙烯酸可用作强粘结强度的结构材料或电子元件的粘结密封材料。

The mechanism and technical improvement of heat setting of terylene filament andT/C blended fabrics have been investigated.In these experiments,nine different mo-dern and ordinary instruments and methods such as X-ray diffracter,IR spectros-copy,differential thermal analysis were used to estimate the changes of terylene'ssuper-molecular structure and fabric quality after heat setting such dimension thermalstability,crease recovery etc.Critical Dissolution Time (CDT)of terylene filament inphenol was used to examine...

The mechanism and technical improvement of heat setting of terylene filament andT/C blended fabrics have been investigated.In these experiments,nine different mo-dern and ordinary instruments and methods such as X-ray diffracter,IR spectros-copy,differential thermal analysis were used to estimate the changes of terylene'ssuper-molecular structure and fabric quality after heat setting such dimension thermalstability,crease recovery etc.Critical Dissolution Time (CDT)of terylene filament inphenol was used to examine the degree of heat setting.The method of estimating theCDT value of terylene staple fiber in T/C blends has been established.Good correlationsbetween crystallinity (d_c),crystal size(s),CDT value,dry thermal shrinkage (c) andheat setting temperature (T) are found,there is an inflexion at 194℃ and 196℃ inthe crystal size vs.heat setting temperature and CDT value vs.heat setting tempe-rature curves respectively.The relations between crystallinity,1g crystal size,1g dry thermal shrinkage and 1g CDT may be shown as follows:1g CDT=10.34×10~(-3) T-13.33×10~(-3)1g CDT=59.08×10~(-3) d_(?)-1.341g S= 0.439/1g CDT+0.88031g C=2.5899-1.1885 1g CDT (constant length,warp)1g C=3.202-1.882 1g CDT (slack,warp)The energy of activation and the frequency of collisions for super-molecularstructure changes of terylene are 1.806×10~4 cal.and 5.355×10~8 sec~(-1) respectively.According to the facts shown above,the CDT value of terylene can be used as acriterion for assessing the crystallininty,crystal size or crystal perfection of terylenefiber,hence a simple and effective method for assessing the result of heat setting.For improving the dimension thermal stability of terylene containing fabrics,thetemperature of setting should be near or slightly lower than the highest temFeratureof the thermal history of the fabric or 20-30℃ higher than the temperature to beencountered in its use.As T/C blended fabrics have better dimension thermal stability,temperature used for setting may be lower than that used for terylene filament fabrics.Nodecrease of amorphous orientation has been found during setting except attemperatures beyond 220℃.The dyeing property of set terylene fabrics depends onthe crystallinity and porosity of the fiber.The effects of tension and setting time arealso discussed.

本文对涤纶长丝和涤/棉混纺织物热定型的机理和工艺改进进行了研究。在实验中采用了九种近代和常规的测试仪器和方法,如 X-射线衍射仪、红外光谱仪、DTA 等测定了定型前后涤纶超分子结构和织物性能如尺寸热稳定性、回复角等的变化。涤纶长丝定型程度可用它在苯酚中的临界溶解时间(CDT)作检验。本实验中还建立了涤/棉混纺织物中涤纶短纤维 CDT 值的测定方法,并获得了关于结晶度(d_c)、晶粒尺寸(s)、CDT 值,织物干热收缩(c)与热定型温度(T)之间的良好关系。在晶粒尺寸和 CDT 值与定型温度的关系曲线中分别在194℃和196℃有一个转折点。CDT 值的对数与结晶度、晶粒尺寸或织物尺寸热稳定性的对数之间的关系可用下列方程表示:1gCDT=10.34×10~(-3)T-13.33×10~(-3)1gCDT=59.08×10~(-3)d_c-1.3401gS=0.4391 1gCDT+0.88031gC=2.5899-1.18851gCDT(定长,经)1gC=3.202-1.882 1gCDT(松弛,经)涤纶超分子结构变化的活化能和碰撞频率为1.806×10~4卡和5.355×10~(?)秒~(-1)。上...

本文对涤纶长丝和涤/棉混纺织物热定型的机理和工艺改进进行了研究。在实验中采用了九种近代和常规的测试仪器和方法,如 X-射线衍射仪、红外光谱仪、DTA 等测定了定型前后涤纶超分子结构和织物性能如尺寸热稳定性、回复角等的变化。涤纶长丝定型程度可用它在苯酚中的临界溶解时间(CDT)作检验。本实验中还建立了涤/棉混纺织物中涤纶短纤维 CDT 值的测定方法,并获得了关于结晶度(d_c)、晶粒尺寸(s)、CDT 值,织物干热收缩(c)与热定型温度(T)之间的良好关系。在晶粒尺寸和 CDT 值与定型温度的关系曲线中分别在194℃和196℃有一个转折点。CDT 值的对数与结晶度、晶粒尺寸或织物尺寸热稳定性的对数之间的关系可用下列方程表示:1gCDT=10.34×10~(-3)T-13.33×10~(-3)1gCDT=59.08×10~(-3)d_c-1.3401gS=0.4391 1gCDT+0.88031gC=2.5899-1.18851gCDT(定长,经)1gC=3.202-1.882 1gCDT(松弛,经)涤纶超分子结构变化的活化能和碰撞频率为1.806×10~4卡和5.355×10~(?)秒~(-1)。上述事实表明涤纶的 CDT 值能在一定程度上反映涤纶纤维的结晶度、晶粒尺寸和完整性,因此,它是一种判断热定型效果的简便而有效的方法。为了提高含涤纶织物的尺寸热稳定性,定型温度应接近或稍低于织物受热史中的最高温度或比使用温度高20°—30℃,由于涤/棉混纺织物的尺寸热稳定性较好,所以定型温度可稍低于涤纶长丝织物。在定型过程中,除非温度超过220℃,无定形取向度不发生降低。定型后涤纶织物的染色性能与纤维的结晶度和空隙度有关。对定型时的张力和时间对定型效果影响也进行了讨论。

 
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