A new method on extraction of phenanthrene from crude anthraceneis given , which includes azeotropic dissolution with ethylene glycol , extraction of carbon tetrachloride , treatment of sulfuric acid and ethyl alcohol recrystallization , in the end , the best process is obtained 研究了从粗蒽中提取菲的方法,即用乙二醇对原料进行共沸,以四氯化碳为溶剂并用硫酸处理,最后用无水乙醇重结晶,制定出最佳的工艺路线
The dolostones have experienced several types of post - depositional diagenetic modifications , of which dolomitization , dissolution , recrystallization and tectonic stress processes have exerted an important effect on porosity and permeability 认为该白云岩在沉积期后变化中经历了多种成岩作用改造,其中影响白云岩储集性的作用主要有白云石化作用、溶蚀作用、重结晶作用和构造应力作用,对白云岩孔渗改善起了积极作用。
Secondly , the recover of lactide from the ethyl acetate recrystallization solution reutilized the waste solution and heighten the general product ratio . the recovery process was analyzed and studied carefully . moreover the two processa above were compared in different aspects 其次,回收重结晶母液使损失在乙酸乙酯中的丙交酯得到循环利用,对回收工艺过程进行了周密分析和探讨,并比较了以上两种过程的异同。
By now , the research has been mature on enhancing the recrystallization temperature and mechanics performance of molybdenum wire in order to prolong its life span and enlarge its employ boundary by doping method . some of the doped molybdenum wire has been manufactured 到目前为止,国内外对于用掺杂的方式提高钼丝再结晶温度和综合力学性能以延长其高温下的使用寿命、扩大其使用范围的研究已比较成熟,有些已投入生产。
Abstract : a new method on extraction of phenanthrene from crude anthraceneis given , which includes azeotropic dissolution with ethylene glycol , extraction of carbon tetrachloride , treatment of sulfuric acid and ethyl alcohol recrystallization , in the end , the best process is obtained 文摘:研究了从粗蒽中提取菲的方法,即用乙二醇对原料进行共沸,以四氯化碳为溶剂并用硫酸处理,最后用无水乙醇重结晶,制定出最佳的工艺路线
After surveyed , morphology of the cathodes shows restore and recrystallization . furthermore after testing the emission characteristic , the surface crystal of the cathode has changed to more fine , and the re oxides become more uniform on the surface 分析发射实验前后阴极表面的形貌和成分变化,观察到,在发射过程中,高温,高电场作用下,阴极表面发生了回复和再结晶过程,表面组织微晶化,同时发射实验后稀土氧化物在表面的分布均匀。
A thermal rigid - visco - plastic constitutive relation accompanied by dynamic recrystallization is implanted into deform3d based on the unix and windows system by means of the user routines in order to add the function of predicting microstructure evolution during hot forging process to deform3d 在unix和windows平台上,对现有的体积成形商业软件deform3d进行了二次开发,利用deform3d的用户子程序功能,插入了包括动态再结晶过程的热粘塑性本构模型。
Zircaloy - 4 sheet , which was cold - worked followed by recrystallization annealing , exhibits longer lcf life in the rolling direction than that in the transverse direction , and the fact that difference in lcf life between both directions becomes larger as the range of plastic strain becomes lower can be attributed to the texture effect , p - solution treatment deteriorates the alloy ' s lcf property because the treatment lowers the average value of alloy ' s schmid factors , and the subsequent annealing - treatment in a - phase range has a impact on the lcf properties , i . e . the subsequent annealing - treatment at 500 ? for 1 . 5h results in better property than that at 750 for 1 . 5h , which comes mainly from the fact that the alloy annealled at 500 for 1 . 5h has lower amount of the precipitate particles than the alloy annealled at 750 for 1 . 5h 对于冷加工后经再结晶退火处理的zr - 4合金,轧制方向的低周疲劳寿命比横向要大。随着_ p的降低,两个方向的低周疲劳寿命的差别相应增加,这是由于合金中存在织构的缘故。冷加工后经再结晶退火处理的zr - 4合金在固溶处理后,抗疲劳性能明显降低,这主要是由于固溶处理降低了合金的schmid因子;固溶处理后在相区的退火对疲劳性能有影响,即500 1 . 5h退火的抗疲劳性能要优于750 1 . 5h退火,这主要与500 1 . 5h退火的合金中沉淀相粒子的数量较少有关。
In view of the recrystallization problem of dz4 alloy directional coagulation turbine blade , experimental study revolving around the blade manufacture craft was performed , the recrystallization organization typical picture was obtained , therefore the recrystallization organization ' s distinction method was determined , and the forming condition of recrystallization organization was founded out , which has provided the basis for the control of recrystallization production 摘要针对dz4合金定向凝固精铸涡轮叶片出现再结晶问题,围绕叶片制造工艺开展试验研究,制作了再结晶组织典型图片,确定了再结晶组织的鉴别方法,摸清了再结晶组织形成条件,为控制再结晶的产生提供了依据。
In this article , molybdenum wire multi - doped with la2o3 and k , al , si , molybdenum wire doped with k , al , si and molybdenum wire doped with la2o3 or y2o3 are analyzed by dsc , hot - draw , sem , optical microscope , micro - hardness , x - ray and tem . it is found that multi - doped molybdenum wire is better at elevating the recrystallization temperature and improving the micro - structure and mechanic properties after recrystallization than molybdenum wire doped with k , al , si 本文通过差热分析、热模拟、扫描电镜、金相显微镜、显微硬度、 x射线衍射和透射电镜等实验手段对复合掺杂k 、 al 、 si和稀土氧化物的钼丝、单掺杂k 、 al 、 si的钼丝以及单掺杂稀土氧化物的钼丝的再结晶温度、高温下的综合力学性能和组织形貌进行了综合对比分析。