期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
常见节育环异常情况分析与取环的体会 被引量:2
1
作者 张亚玲 《求医问药(下半月)》 2013年第2期594-595,共2页
目的:观察分析常见节育环异常情况及取环的方法,总结其临床处理经验和体会。方法:选取我院2010年5月至2012年5月39例取环过程中发生节育环异常的妇女,对其临床诊治资料进行回顾性分析。结果:39例妇女中,合理使用麻醉药物后扩宫颈顺利取... 目的:观察分析常见节育环异常情况及取环的方法,总结其临床处理经验和体会。方法:选取我院2010年5月至2012年5月39例取环过程中发生节育环异常的妇女,对其临床诊治资料进行回顾性分析。结果:39例妇女中,合理使用麻醉药物后扩宫颈顺利取出13例,通过改变取环的角度后顺利取出10例,经改用其他取环工具顺利取出7例,通过改变取环的角度或改用其他取环工具顺利取出7例,余1例改行宫腔镜下取环术取出,1例经多人多次皆无法取出后,行开腹手术取出。结论:取环过程中可灵活根据异常情况合理尝试以麻醉药物、改变取环角度、在B超引导下改用其他取环工具等处理,必要时酌情采取宫腔镜手术或开腹手术取出,减少脏器损伤,保障妇女安全。 展开更多
关键词 节育 取环过程 麻醉药物 宫腔镜手术 开腹手术
下载PDF
PERFORMANCE OF THE CONTINUOUS AFFINITY-RECYCLE EXTRACTION PROCESS
2
作者 孙彦 董晓燕 甘一如 《Transactions of Tianjin University》 EI CAS 1995年第1期19+16-19,共5页
The continuous affinity- recycle extraction (CARE) process is extended ic a system with ultrafiltration membranes. The mathematical model of the process is established by taking into account membrane rejections to th... The continuous affinity- recycle extraction (CARE) process is extended ic a system with ultrafiltration membranes. The mathematical model of the process is established by taking into account membrane rejections to the components in a crude mixture. The process performance, defined as concentration factor (CF ), purification factor (PF ) and recovery yield (REC), is analyzed by computer simulations. The results show that CF and REC increase, but PF decreases with the membrane rejection. It is likely that optimum operating conditions exist to give the best process performance because the increases in eluant and affinity-recycle flow rate improve REC but decrease PF. 展开更多
关键词 affinity-recycle extraction continuous process mathematical model membrane rejection process performance
下载PDF
OPTIMIZATIONOFTHECONTINUOUSAFFINITY-RECYCLEEXTRACTIONPROCESS
3
作者 DONG Xiaoyan GAN Yiru SUN Yan (Dept. of Chemical Engineering) 《Transactions of Tianjin University》 EI CAS 1996年第1期19-22,共4页
Single step and multi step CARE processes are optimized by computer simulations based on the mathematical model proposed previously. The product of purification factor and recovery yield is used as the objective fun... Single step and multi step CARE processes are optimized by computer simulations based on the mathematical model proposed previously. The product of purification factor and recovery yield is used as the objective function for optimizing a single step process. The objective function for the optimization of a multi step process is considered to obtain an anticipated product purity at a maximum recovery yield and a minimum number of CARE inividuals. Pairs of the operating conditions (eluant and affinity recycle flow rates) exist to give the maximums of above objective functions when membrane rejections to ligates and contaminants are equal in value. The optimum affinity recycle flow rate decreases with the increase of membrane rejections and equilibrium binding fractions of ligates. For a multi step process, when contaminants are rejected less than ligate, only one pair of the optimum eluant and affinity recycle flow rates exists. 展开更多
关键词 affinity recycle extraction objective fuction single step process multi step process optimization
下载PDF
First-principles investigation on structural and electrochemical properties of NaCoO_2 for rechargeable Na-ion batteries
4
作者 粟劲苍 周广 +2 位作者 裴勇 杨振华 王先友 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2036-2042,共7页
NaxCoO2 is a commonly used cathode material for sodium ion batteries because of its easy synthesis, high reversible capacity and good cyclability. The structural and electrochemical properties of NaxCoO2 during sodium... NaxCoO2 is a commonly used cathode material for sodium ion batteries because of its easy synthesis, high reversible capacity and good cyclability. The structural and electrochemical properties of NaxCoO2 during sodium ion insertion/extraction process are studied based on first principles calculations. The calculation results of crystal structure parameters and average intercalation voltage are in good agreement with experiment data. Through calculation of the geometric structure and charge transfer in charging and discharging processes of NaxCoO2, it is found that the oxygen atom surrounding Co of the CoO6 octahedral screens the coulomb potential produced by sodium vacancy in NaxCoO2, and the charge is removed from the entire Co-O layer instead of the Co atom adjacent to sodium vacancy when sodium ions are extracted from the Na CoO2 lattice. Thus, during the insertion/extraction of sodium ion from Na CoO2, the CoO6 octahedral structure undergoes small lattice distortion, which makes the local structure quite stable and is beneficial to the cycling stability of the material for the application of sodium ion batteries. 展开更多
关键词 sodium ion batteries first principles calculation cathode material electronic structure
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部