The wxrd characterization showed that o - mmt possessed obvious nucleation effect on the crystallization process of b - pp . jeziorny and mo methods were used to study the non - isothermal crystallization process . the obtained value of kinetics parameters such as tp , n , zc , t1 / 2 , a h , f ( t ) , e showed that the o - mmt has nucleation effect in crystallization of pp and can increases the crystallization temperature of pp , quickens the crystall ization velocity , decreases the crystallization activation energy of pp but decreases the crystallization degree of pp at the same time 运用jeziorny法和mo法研究了聚丙烯和复合材料的非等温结晶过程，所得到的非等温结晶过程动力学参数t _ p ， n ， z _ c ， t _ ( 1 / 2 ) ， h ， f ( t ) ， e的数值表明，有机蒙脱土的加入可以起到异相成核的作用，从而提高pp的结晶温度，加快pp的结晶速率，降低pp的结晶活化能，但同时也会降低pp的结晶度。
With the thermodynamic theories and techniques , it is relatively easy to determine the phase equilibrium data with enough accuracy , however there still exist much more difficulties in crystallization kinetics study even for a simple binary system . that is the reason that nucleation and crystal growth rate are generally represented in form of the empirical expressions . the crystallization kinetic is important for crystallizer design , process control and optimization , and it is strongly depended upon the accurate characterization of process information concerning with multiphase flows and the further disclose of its mechanisms with suitable mathematical models 热力学理论和方法已足以获得准确的相平衡关系；然而即使对于简单的二元物系的结晶过程，晶核形成和晶体生长动力学的研究仍面临许多困难，通常采用经验模型表述，而动力学参数的准确性和可靠性是结晶器放大设计、过程控制与优化的关键，因此多相流信息的准确表征、结晶机理的进一步揭示及建立起与之相适应的数学模型有着十分重要的学术研究和实际应用价值。
Considering the mass balance law for solute , and combining with the populance balance model and the mccabe ' s l law , a linear crystal growth rate model was presented for potassium nitrate aqueous system . the test variables of both the liquid and solid for kinetic parameter estimations were given on this model , and the experimental apparatus were also set up 基于粒数衡算模型，以kno _ 3 - h _ 2o为模型研究体系，根据结晶过程中溶质质量守恒和mccabe定律，首先建立了晶体线性生长动力学模型，并确定出动力学参数估计所需要表征的固液两相物理参数，进而建立了实验表征方法和测定装置。
The variable polarity power supply circuit uses two stages full - bridge inverter , the former inverter is regarded as a constant - current source with fast dynamic response , and supplys energy for the second one , and the latter one is to produce variable polarity current excellently , and low - frequency pulse current by variable polarity power supply is used to reduce input energy and control the shape of weld bead while welding . a series of high - frequency pulse current is superposed on direct - current - electrode - negative ( dcen ) current through the high - frequency pulse power supply , which is used to compress the arc and improve process of crystallization 其中变极性电源采用二次全桥逆变结构,一次逆变提供快速的响应速率并给二次逆变提供能量,二次逆变提供良好的变极性性能,使输出能量最优化,并用其低频电流特性减小电弧线能量,控制焊缝成形;高频脉冲电源提供的高频电流叠加在反极性电流dcen上,利用电流的高频特性压缩电弧,改善焊缝金属结晶过程。
It ' s well - known that nucleation consisted of homogeneous nucleation and heterogeneous nucleation . the organic matrix used as the template to induce inorganic crystal growth and simulate the biomineralization is actually to promote heterogeneous nucleation and inhabit homogeneous nucleation . urinary stone is a kind of product of unusual biomineralization 众所周知，结晶过程中的成核有均相成核和非均相成核两种可能，利用有机基质做模板，诱导无机晶体生长，模拟生物体内的矿化过程实际是促进非均相成核而抑制均相成核。
According to the i - t curves of potential step , it was revealed that electrocrystallization of ni - w - b alloy on glassy carbon followed the mechanism of instantaneous nucleation and three dimensional growth with diffusion controlled . the crystal nucleus number on the surface of electrode raised by the increase of over potential 根据电位阶跃的i t曲线分析得知，在玻摘要碳电极上ni wb合金电结晶过程遵从扩散控制瞬时成核三维成长模式进行，且随着过电位的增加，电极表面上晶核数增多。
Substituted by a densimeter based on the archimedes laws , the online concentration measurement was further modified , and the quality of the measured data was improved with satisfactory accuracy and repeatability . nevertheless , information obtained from the continuous phase ( concentration or supersaturation measurements ) was still not enough to completely define the system 为此，本文基于阿基米德定律，采用密度法改进了实验装置，实现了对结晶过程中溶液浓度或过饱和度的连续在线测量，并提高了测定精度，所测得实验数据具有较好的重现性。
Therefore , in addition to the measurement of dissolved solid concentrations obtained through online densimeter , transmittance measurements should be performed to provide online data about the second moment of csd ( crystal size distribution ) . in this thesis , a light sensitive resistor served as the light / electricity conversion component was used to measure the transmittance 为解决动力学研究中所涉及的固相信息实时测定问题，根据模型需在线检测结晶过程中溶液透光率，本文以光敏电阻作为光电检测元件，构建了一双光路检测系统，有效地提高了测定系统的稳定性。
In this paper , the course of isothermal crystallization kinetics of polymer in limited volume unit is simulated by use of the method of monte carlo . four factors influenting on the course of polymer in the limited volume unite isothermal crystallization are analyzed under the given conditions . the four factors are sample volume shrinkage , the change of the linear growth rate of entities g , the change of sample thickness and the change of the number of nuclei 本文采用montecarlo方法研究了高聚物在有限体积元中的等温结晶动力学过程，分析了在一定条件下，样品体积收缩、晶体线生长速率变化、样品厚度变化和晶核数目变化这四种因素对高聚物在有限体积元中的等温结晶过程的影响。
This has an important meaning to the industrial manufacture . dsc , waxd and polarizing microscope with hot stage experiments were performed to describe what led the ssp rate acceleration of pet / mmt . it was shown that montmorillonite acted as a very good nucleating agent in pet crystallization process , which results in the lower crystallinity , more small microlites , and more surfaces of microlites 为研究pet mmt固相缩聚效率提高的原因，通过热台偏光显微镜、 dsc 、 x -射线衍射等手段对样品的结晶进行观察与分析研究，结果表明蒙脱土对pet的结晶有明显的成核作用，使其晶核生成速率迅速提高，晶核数量明显增多，从而使整个结晶过程的时间变短，同时形成了更多结构不完善的微晶体。
