基于优化卷积法和静态安全约束的电网外受电分析

本文提出一种基于发电可靠性和静态安全分析的区域电网外受电能力评估方法。一方面,在保证系统可靠性的前提下,采用优化卷积法计算电网的最小外受电需求,并将之与传统蒙特卡洛模拟对比;另一方面,分析了系统电源、负荷以及网架结构,设置相应的外联络点以及静态安全约束,并通过逐步协同提高系统内负荷水平和外受电能力,求解系统最大外受电能力。以某区域电网2020年规划方案为算例进行分析,结果表明,所提优化卷积算法在计算效率上较蒙特卡洛模拟法更高;所计算的外受电的需求和规模,可以从外受电的角度论证该规划方案的合理性。

特高压外受电规模与需求分析

由于中国能源分布与电力需要的不一致分布的问题,受端电网外受需求及规模的规划问题显得尤为重要。为研究受端电网合理的特高压外受电需求及规模,文中基于概率性准则的卷积法计算得到可靠性指标,并利用可靠性计算可靠性理论核算地区电网的外受电需求;然后通过静态安全稳定性规划电网能够输送的规模。最后通过对某受电地区进行算例分析,得到了外受电需求与规模,证明了方法正确性。

Effect of electroacupuncture on oocyte quality and pregnancy of patients with PCOS undergoing in vitro fertilization and embryo transfer

Objective To observe the impacts of electroacupuncture （EA） on oocyte quality and pregnant outcome for the patients with polycystic ovary syndrome （PCOS） undergoing in vitro fertilization and embryo transfer （IVF-ET） and explore its potential mechanism. Methods Sixty-six patients with PCOS and undergoing IVF-ET were divided into two groups randomly, including an observation group （34 cases） and a control group （32 cases）. Ethinylestradiol and cyproterone acetate tablets and gonadotropin-releasing hormone agonist were administered for long-program superovulation in either group. In the observation group, the intervention of EA was applied to Guānyuán （关元 CV 4）, Zhōngjí （中极 CV 3）, Sānyīnjiāo （三阴交 SP 6）, Zǐgōng （子宫 EX-CA 1） and Tàixī （太溪 KI 3） additionally for 30 min, once daily, 1 menstrual cycle before controlled ovarian hyperstimulation （COH） and during COH. The pregnant outcome, evaluation of kidney deficiency syndrome, blood hormone level on the day of human chorionic gonadotropin injection and the concentrations of stem cell factor （SCF） in the serum and follicular fluid on the day of oocyte collection were compared between the two groups. Results The score of kidney deficiency symptoms was reduced remarkably after treatment in either group and the improvement in the observation group was superior to that in the control group （P0.01）. The fertilization rate [（76.25？±？20.33）% vs （66.34？±？15.44）%], cleavage rate [（98.66？±？3.70）% vs （94.47？±？9.45）%] and the rate of high-quality embryos [（60.20？±？22.20）% vs （50.55？±？16.15）%] in the observation group were all superior to those in the control group separately （all P0.05）. Clinical pregnancy rate （46.67%, 14/30） in the observation group was higher than that （37.93%, 11/29） in the control group, but without statistical difference （P0.05）. SCF concentrations in the serum and follicular fluid on the day of oocyte collection in the observation group were higher obviously than those in the control group （both P0.05）. Conclusion Electroacupuncture plays an active role in the pregnant outcomes of PCOS patients undergoing IVF-ET and it can relieve the symptoms of kidney deficiency in terms of TCM and improve clinical pregnant rate. The mechanism is relevant to the overall adjustment of organic endocrinal system and the local micro-environment of ovary and the improvement of oocyte quality through the up-regulation of SCF concentration.

Effects of electro-acupuncture on embryo implanted potential of patients with infertility of different syndromes

Objective To explore the impacts of electro-acupuncture on embryo implanted potential and its molecular mechanism in patients with infertility of different syndromes. Methods Among infertile patients treated with in vitro fertilization and embryo transplantation （IVF-ET） combined with electro-acupuncture, 82 cases of kidney deficiency syndrome （group A）, 74 cases of liver qi stagnation syndrome （group B） and 54 cases of phlegm dampness syndrome （group C） were selected. Patients in three groups all received a long program of ovarian hyperstimulation. Additionally, electro-acupuncture was applied before controlled ovarian hyperstimulation （COH） and in the process of ovarian hyperstimulation. Contents of human leukocyte antigen G （HLA-G） in the serum were determined in three groups respectively on the 2nd day of menstruation （M2） and the day of human Chorionic Gonadotropin （hCG） injection. Content of HLA-G in the culture solution of three groups was examined separately on the day of embryo transplantation. The fertilization rate, implantation rate and clinical pregnancy rate were observed for patients in three groups. Results Contents of HLA-G in the serum on the day of hCG injection and in the culture solution on the day of embryo transplantation in group A and B were significantly higher than those in group C （all P0.05）. However, there was no significant difference with contents of HLA-G in serum on M2 day among three groups. The high quality embryo rate in either group A （73.6%, 352/478） or group B （70.6%, 379/537） was significantly higher than that in group C （54.2%, 208/384） with significantly statistical difference （all P0.01）. But there were no significant differences in clinical pregnancy rate, fertilization rate and cleavage rate among three groups. Conclusion Electro-acupuncture combined could increase contents of HLA-G in the body and the level of HLA-G secreted from embryos of patients in the process of IVF-ET. Eventually, the pregnancy outcome and the pregnancy rate are improved. It showed better clinical effects of electro-acupuncture for patients with kidney deficiency and liver qi stagnation syndromes than those of phlegm dampness syndome.

Effects of different external carbon sources and electron acceptors on interactions between denitrification and phosphorus removal in biological nutrient removal processes

The effects of two different external carbon sources （acetate and ethanol） and electron acceptors （dissolved oxygen, nitrate, and nitrite） were investigated under aerobic and anoxic conditions with non-acclimated process bi- omass from a full-scale biological nutrient removal-activated sludge system. When acetate was added as an external carbon source, phosphate release was observed even in the presence of electron acceptors. The release rates were 1.7, 7.8, and 3.5 mg P/（g MLVSS.h） （MLVSS： mixed liquor volatile suspended solids）, respectively, for dissolved oxygen, nitrate, and nitrite. In the case of ethanol, no phosphate release was observed in the presence of electron acceptors. Results of the experiments with nitrite showed that approximately 25 mg NO2-N/L of nitrite inhibited anoxic phosphorus uptake regardless of the concentration of the tested external carbon sources. Furthermore, higher deni- trification rates were obtained with acetate （1.4 and 0.8 mg N/（g MLVSS.h）） compared to ethanol （1.1 and 0.7 mg N/ （g MLVSS.h）） for both anoxic electron acceptors （nitrate and nitrite）.