Results 61 to 70 of about 306,702 (103)

2,5-二氨基己二酸四亚甲基膦酸的阻垢缓蚀性能研究

Gongye shui chuli, 2008
采用鼓泡法和旋转挂片失重法评定了2.5-二氨基己二酸四亚甲基膦酸(DAATMP)的阻垢和缓蚀性能，探讨了药剂浓度、溶液pH、钙离子浓度、反应时间等对阻垢和缓蚀性能的影响。试验结果表明：在Ca2+质量浓度为120mg/L,pH=8.5，温度60℃,阻垢剂投加质量浓度为5mg/L的条件下，阻垢率达到89.0%。对比实验表明：在pH=7.0，温度为80℃，Ca2+质量浓度为120mg/L，阻垢剂投加质量浓度为10mg/L的条件下，DAATMP的阻垢效果明显优于PBTCA和DETPMP，阻垢率达到84 ...
何好启, 袁斌, 吕松
doaj  

Research progress on the relationship between chronic periodontitis and Parkinson's disease. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban, 2022
Bian M, Chen L, Lei L.
europepmc   +1 more source

电压——频率变换器

, 1986
电压--频率变换器,它具有一个由差分放大器构成的积分器,一个电平可控脉冲发生器,一个开关控制器和一个精密电荷分配器.该精密电荷分配器是由三个开关,一个定电荷电容,一个参考稳压管,一个充电电阻及一个负电源组成的.该定电荷电容放完电后,通过上述充电电阻,在上述差分放大器的反相输入端和上述负电源之间积分充电到上述参考稳压管的击穿电平而完成定电荷的.较之已有的积分定电荷反馈复原型电压--频率变换器的定电荷方式优越,提高了变换器的精度,稳定性和高频性能 ...
唐军
core  

[Latest Research Findings on the Mechanism of Periodontal Pathogens in Cardiovascular Disease]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban, 2022
Wang ZK, Xu X, Zhou XD.
europepmc   +1 more source

硫酸钙在卤水输送管道中的结垢抑制

, 2008
对含少量 CaSO_4的 NaCl-Na_2SO_4-H_2O 卤水体系中结垢的抑制技术进行研究,15～75℃时通过等温溶解方法测定工业卤水中(NaCl 300∥L;Na_2SO_4 20 g/L)硫酸钙的溶解度,得出其结垢原因。开发一种新型吸附剂,可以选择性去除卤水中过饱和硫酸钙,以达到抑制 CaSO_4结垢的目的。结果表明:卤水中硫酸钙过饱和度的去除率与加入吸附剂的质量成比例;15℃时,当加入吸附剂的量为1.50g/L 时,15 min 内过饱和的去除率就可达到75.2 ...
段东平, 柯家骏, 李志宝, G.P.DEMOPOULOS, 王红庆, 包宗宏   +5 more
core  

[Advances in Research on the Mechanism of Association Between Periodontitis and Diabetes Mellitus]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban, 2023
Li LL, Xie XT, Wu Y, Yan FH.
europepmc   +1 more source

[Strategic orthodontic treatment for multiple mesioangular impacted molars: a case report]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Zhan J, Zhang J, Fan W, Fu H, He X, Hu L.   +5 more
europepmc   +1 more source

[Advances in the surgical treatment of cholesteatoma of the middle ear]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi, 2021
Li C, Wang B, Zhang H, Yang S, Yang T, Han X, Liu H, Zhang W.   +7 more
europepmc   +1 more source

[Technical specification and consensus on routine oral health examinations for adults]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Health Promotion Professional Committee of China Association for Promotion of Health Science and Technology, Journal of Health Examination and Management Editorial Committee, Sichuan Preventive Medicine Association, Health Management Medicine Professional Committee of Sichuan Medical and Health Care Promotion Institute, Society of Preventive Dentistry, Sichuan Stomatological Association.   +5 more
europepmc   +1 more source

[Initial clinical experience and follow-up outcomes of treatment for ureteroileal anastomotic stricture with Allium coated metal ureteral stent]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban, 2020
Dong WM, Wang MR, Hu H, Wang Q, Xu KX, Xu T.   +5 more
europepmc   +1 more source