When the linear growth rate of entities g reduces , the value of vc reduces too . however , the values of avrami exponent and s are hardly affected by the value of g . the conclusions are approved by the data from hspom experiment 晶體線生長速率g減小,對avrami指數(shù)n值和_ s值基本沒有影響:而g減小, v _ c值也會減??;熱臺偏光顯微鏡實(shí)驗(yàn)以peo為樣品,也證實(shí)了這些結(jié)果。
It was found that the linear growth rate of srs is reduced substantially due to ld and cd . srs can occur only for a region determined by both electron temperature and density . gap in the spectrum corresponding to raman scattering can be explained by the present model 結(jié)果表明碰撞阻尼和landau阻尼大大降低了受激raman散射的線性增長率,并且碰撞阻尼和landau阻尼的共同作用使得受激raman散射只能在四分之一臨界密度以下區(qū)域的一窄小的密度范圍發(fā)生,我們這個理論模型可以解釋受激raman散射光譜上存在的“縫” ( gap )現(xiàn)象。
Firstly , the integral - differential equation described the radiation field evolution is derived , and then the instability of its solution is also investigated analytically . by using the perturbation and iteration method , the threshold detuning and threshold linear growth rate of the unstable solution are analyzed and discussed in detail 首先,建立了一個描述輻射場演化的積分一微分方程,解析分析了系統(tǒng)解的不穩(wěn)定性,并采用線性方程解的微擾迭代方法進(jìn)一步對系統(tǒng)不穩(wěn)定解出現(xiàn)的失諧量閾值和線性增長率閾值等作了詳細(xì)討論。
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體積元中的等溫結(jié)晶動力學(xué)過程,分析了在一定條件下,樣品體積收縮、晶體線生長速率變化、樣品厚度變化和晶核數(shù)目變化這四種因素對高聚物在有限體積元中的等溫結(jié)晶過程的影響。