As crystallization progresses across the temperature gradient , it is possible to move the sample by precise stepper motor control ( at specified rate ) in the opposite direction so that the crystallization front remains in the field of view 当沿着温度梯度方向发生结晶过程的时候，可以向相反方向通过高精度步进马达移动样品，这样可以把结晶前沿始终保持在视域中。
This paper first introduces the background of the study , then reviewed recent work and discoveries in the studies of macromolecular crystallization using both homogeneous and inhomogeneous magnetic field , and finally discusses the future research directions in this field 就强磁场环境对生物大分子结晶过程的影响研究进行了评述，并对该领域的未来发展方向做了预期。
Li , mg and both of them were doped into zno films , which could improve the crystallization , orientation and morphology . an afm image of sample lza - b21 thin film is indicative of the grain growth in the direction perpendicular to the substrate surface 由于在zno薄膜中掺入li和mg能有效提高薄膜结晶过程中的扩散，因此，掺li和mg氧化锌薄膜有更好的结晶度和表面形貌平整度。
Firstly , the computer simulating model of the limited volume unit is established . then pet is chosen as sample . generally , under predetermined nucleation condition , the course of pet isothermally crystallized at 170 c in limited volume unit is simulated 计算机模拟实验首先建立了有限体积元模型，然后选定了pet为样品，一般模拟其在预先成核条件下、 170时的等温结晶过程。
The linear simulations indicate that the primary stage of both isothermal and nonisothermal processes can be described by avrami equation , however the linear relations deviate due to the secondary crystallization , particularly for that of nonisothermal crystallization 结果显示avrami方程可以较好地描述该等温及非等温过程中的主期结晶阶段，而在次期结晶阶段，由于二次结晶现象而导致线性关系偏离，特别是在非等温结晶过程中。
Crystallization from solution is an important unit operation process in the field of chemical engineering , which could be used to separate and purify the higher purity solid products with lower costs , and has been applied in most traditional industries 多数传统工业与结晶过程都有着十分密切的关系。近年来，新材料、信息电子、生物化工、新型能源材料及环境科学等高新技术产品的制备、分离和提纯也越来越有赖于结晶技术的支撑。
The meltable liquid touches with the rotary drum of cooling that form material film in rotary drum appearance . the heat exchange between material film and drum wall makes material film cooling and crystallization . the crystal material film is cut by scraper which forms piece product 转鼓结片是一个冷却结晶过程，料盘中熔融料液与冷却的转鼓接触，在转鼓表面形成料膜，通过料膜与鼓壁间的换热，使料膜冷却结晶，结晶的料膜被刮刀刮下，成为片状产品。
The effects of main process factors such as feeding mode , reaction ph values , and ratio of ammonia and nickel ion , reaction time , agitation , reaction temperature and aging et al on the crystallization course and physical properties of nickel hydroxide were studied in detail . at last , we acquired the optimal preparation parameters , the spherical nickel hydroxide with high tap density and crystalloid degree , perfect flow ability were prepared 在研究加料方式，氨水的加入量，反应时间、体系ph值、反应温度、搅拌、陈化等主要工艺条件对ni ( oh ) _ 2结晶过程和物理性能影响的基础上，确定了较优的工艺参数，制备出了堆积密度和结晶致密程度较高、流动性较好的球形ni ( oh ) _ 2 。
The crystallization and melting behavior of mellocene - catalized branched and linear polyethylenes of low molecular weight was studied . it was found that the crystalline lattice of branched polyethylene is larger than that of linear polyethylene because of the existence of branched chains . the melting behavior of branched polyethylene is similar to that of linear polyethylene since the branched chains can not enter the lattice . however , the crystalline behavior of low molecular weight branched polyethylene is the same as that of high molecular weight linear polyethylene , but different with that of low molecular weigh linear polyethylene . kinetics theory analysis evidenced that the transition temperature of growth regime of the branched polyethylene is about 20 lower than that of linear polyethylene with the same molecular weight . it may be attributed to the existence of short branched chains 研究了金属茂催化的低分子量支化聚乙烯和线性聚乙烯的结晶及熔融行为，发现支化聚乙烯的结构与线性聚乙烯相同为正交结构，但晶格略有膨胀.支链的存在对熔融行为影响不大，两种聚乙烯的熔点均随结晶温度的升高而非线性增加，表现出低分子量样品的共同特征.但支链的存在对结晶行为却有很大的影响，主要是由于支链的存在降低了晶体的结晶速率从而影响结晶过程，使得低分子量的支化聚乙烯的结晶行为与高分子量线性聚乙烯的结晶行为相似而与低分子量的线性聚乙烯不同.动力学分析表明，低分子量的支化聚乙烯的结晶生长方式的转变温度比同等分子量的线性聚乙烯降低了约20
The topic is on the basis of the synthesis of the basic magnesium chloride whisker . the research perform the recycling experiment on the synthesis and property of the basic magnesium chloride whisker by adding ammonia or magnesium chloride and ammonia simultaneously into the mother liquid of crystal and during the synthesization of the basic magnesium chloride whisker , we add the seed crystal , additive , or surfactant in order to increase the yield of crystal 在课题组已成功合成碱式氯化镁晶须的基础上，为提高碱式氯化镁晶须的产率，进行了在结晶母液中补加氨水或同时加入氨水和氯化镁的循环试验，并进行了在合成碱式氯化镁结晶过程中加入添加剂、晶种和表面活性剂试验，研究对碱式氯化镁晶须合成及性能的影响。
