When being sporadic nucleation condition , four cases are considered that the number of nuclei increase with time by different ways . in every case , if the initial number of nuclei go up , the value of the avrami exponent n goes down approximately from 4 to 3 , on the contrary , the value of vc moves up 在散现成核条件下，考虑了晶核数目m随时间增加的四种不同情况，随着初始晶核数目m _ o的增加， avrami指数n值由接近于4逐渐减小到接近于3 ； v _ c值增加。
The gel c - s - h has the trend to crystallizing and transforming into low crystallized hydrates , which were similar to tobermorite . the incorporation of mineral mixtures improves greatly the orientation of ch either in interface zone or matrix zone and the crystal sizes also become small 由于矿物掺合料的晶核作用、填充密实和二次水化作用，明显改善了界面过渡区和基体中ch的择优取向，并且不论是在界面区还是基体中，结晶相的晶粒尺寸都发生了明显的细化。
The results show that the deposition of nickel on the substrate do not undergo upd process , but undergoes nucleation process . in the experimental conditions , the electrocrystallization of nickel follows the mechanism of three dimensional progressive nucleation and growth 结果表明，镍在该基体上的沉积没有经历upd过程，镍的电沉积经历了晶核形成过程，在所研究的外加电位范围内，其电结晶按连续成核和三维生长方式进行，外加电位对晶体生长具有显著的影响。
( 3 ) the current density is the driving force for electrochemical reaction in the thin films formation process ; the greater the current density , the quicker the electrochemical reaction , the more easily the nuclei formation , whereas the excessive current density would affect the quality of the as - grown thin films ( 3 )电流密度是电化学成膜过程中电化学反应的驱动力，电流密度越大，电化学反应越容易，晶核越容易形成，但过大的电流密度会影响成膜的质量。
By means of sem , tem , laser scattered particle analyzer , etc . , the formation mechanism of ultrafine sio2 particle was studied . it was found that at the initial stage , the sio2 particle consisted of some minicrystal , but after the initial stage the sio2 particle was formed by some soluble aggregated substance growing on the surface of the early particle 运用扫描电镜、透射电镜、激光粒度分析仪等检测手段，探讨了体系中超细二氧化硅颗粒的形成机理和过程，指出超细二氧化硅粒子前期是由体系中的微晶核组成，中后期则由体系中的可溶性缩合物在其表面生长而成。
The compositions of usual elements and rare earth elements and inclusions of corundum megacrysts related to alkali basalt in changle , shandong province , are analyzed . in the main parts of corundum megacrysts are a large number of fluid - melting inclusions , zircon , ta - columbite inclusions , and in the central crystal core are a large number of melting inclusions . the corundum megacrysts were formed in different periods and different physical chemistry conditions . the crystal core was formed in magma system , and the main parts were formed in inhomogeneously geochemical conditions in which magam and fluid phases coexisted 分析山东昌乐与碱性玄武岩有关的刚玉巨晶不同部位的常量元素、稀土元素及包裹体组成.刚玉巨晶的主体以大量流体?熔体包裹体、锆石、铌(钽)铁矿包裹体为主，而巨晶中的“晶核”部位则以大量的熔体包裹体为主，反映研究区的刚玉巨晶是在不同的阶段形成的.刚玉“晶核”以及“铜皮刚玉”形成于熔体相为主的体系中，而主体刚玉则形成于熔体?流体过渡的急剧变化的不均一的地球化学环境中
The sample thickness declining , provided the number of nuclei per unit volume fix , the value of the avrami exponent n falls , but the values of vc and s almost do n ' t change . when the value of thickness reduce to the average diameter of entities , the turning point turn up after the course of crystallization has begun soon 当单位体积内晶核数目不变时，样品厚度h减小， n减小； v _ c和_ s值基本不变：当h降到小于等于体系内球晶的平均直径时，在结晶最初期，会出现一个初期转折点。
Through the analyzing the macro - structure to micro - structure , the author considers that retarding mechanism of citric acid is that citric acid and ca in the gypsum form the complexant ion , and hinder the crystallization center of dihydrate crystal bigger ; that of sodium tripolyphosphate is that it combined with ca , hinders the dissolve of hemihydrate . formation and growth of crystallization center ; that of bone glue is the glue - protection and chemical absorption action of active group , which also retards the formation and growth of crystallization center 通过宏观到微观的分析，笔者认为，柠檬酸的缓凝作用的原因主要在于柠檬酸与钙形成络合离子，影响了二水石膏晶体的晶核长大过程；多聚磷酸钠与钙形成某种复盐，对于石膏晶体的溶解、成核和长大过程均有强烈的阻碍影响；骨胶则在于胶体对半水石膏的包裹和活性基团的化学吸附，使二水石膏晶体的成核和长大困难。
The microtube zno econtrollable growth on the glass substrate , which was previously deposited , of zno hollow spheres was researched . the results showed that zno hollow spheres acted as crystal nucleus of zno microtubes . by this method regular zno microtubes were synthesised . the growth of microtubes can be controlled by change the size of zno hollow spheres 结果发现zno中空球层对zno微米管的生长起到了晶核的作用,能够在玻璃衬底上形成形貌规则的zno微米管;改变zno中空球的粒径能够改变所形成的zno微米管的尺寸,从而实现了对zno微米管的可控生长。
The precipitation sequence is . - supersaturated solid solution - stoicheometric " phase - growth . with the increase of the composition there is more characteristic of non - classical nucleation and growth , and the order parameter values of critical ordered nucleus decrease . the precipitation sequence is : supersaturated solid solution - nonstoicheometric ordered phase - stoicheometric " phase - growth 随浓度增加，大部分亚稳区合金沉淀非经典形核长大的特征增强，有序相临界晶核序参数分布曲线降低，且分布更加平缓，沉淀序列为：过饱和固溶体非化学计量比有序相化学计量比相长大，非化学计量比有序相并非热力学意义上的亚稳相，研究工作明确了这一点。
