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793 results on '"Zheng, Mingming"'

158. Influence of cement slurry heat release on physical properties of marine hydrate reservoirs during well cementing

Author

Zheng Mingming, Wang Xiaoyu, Wang Zhilin, Zhou Kerui, Wang Kai, Dong Gang, and Liu Tianle

Subjects
Environmental sciences, GE1-350
Abstract

Natural gas hydrates gradually become the focus of new energy resources, and the study of hydrate exploitation is growing vigorously during recent years. Well cementing is an important process during energy exploitation, especially when encounters hydrate bearing sediments in deep-water oil and gas drilling, showing great research significance and becoming a research hotspot. In this study, the exploratory well of SH2 of GMGS-1 project is chosen as the object of study, a cementing model of two dimensions based on this exploratory well is build, the invasion process of cement slurry is reappeared by TOUGH+HYDRATE, and the physical properties response of hydrate reservoirs during the cementing process is analyzed based on the numerical simulation data. In which, a view of “continuous stage simulation” to solve the problem of dynamic heat release of cement slurry is created and used for the first time. Result illustrated that the invasion behavior of cement slurry almost only occurred during the stage of holding pressure, the temperature has significantly increased in the area of reservoir which is invaded by cement slurry. At the same time, a large amount of decomposed hydrate have generated gas and water, which form high pressure region and transfer toward the deeper of reservoir. However, the variation in the temperature is not significant and the hydrate barely no longer decomposed in those area which outside or even though close to this area. There also have generated secondary hydrate closed to the area of decomposition and formed high saturation zone of hydrate. The results also proved the feasibility of “continuous stage simulation”, and played a guiding significance for the field well cementing.

Published
2021
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159. Research on improving low frequency oscillation characteristics of wind power system with DFIG-PSS-VI

Author

He Ping, Zheng Mingming, Li Zhao, Fang Qiyuan, and Wu Xiaopeng

Subjects
Environmental sciences, GE1-350
Abstract

The new energy represented by strong random wind power connecting to the power system may make the problem of inter-area low-frequency oscillation more serious. In this paper, a DFIG-PSS controller based on virtual impedance is constructed to solve the low-frequency oscillation problem in the wind power system. The step response of PSS-VI was carried out to test the effect of the controller to verify the advantages of PSS-VI than traditional PSS. The input signal of PSS-VI which is a controller based on PSS installed virtual impedance is the active power of DFIG. The output signal of PSS-VI is added to the reactive power control loop of rotor side controller of DFIG. DFIG-PSS-VI was built in Digsilent/Powerfactory software, and the simulation was carried out on the system of 4 machines and 2 regions. It is verified that PSS-VI can improve the low-frequency oscillation of wind power system.

Published
2021
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182. Correction to “Discovery of Dual CDK6/PIM1 Inhibitors with a Novel Structure, High Potency, and Favorable Druggability for the Treatment of Acute Myeloid Leukemia”

Author

Yuan, Kai, primary, Ji, Minghui, additional, Xie, Shengnan, additional, Qiu, Zhixia, additional, Chen, Weijiao, additional, Min, Wenjian, additional, Xia, Fei, additional, Zheng, Mingming, additional, Wang, Xiao, additional, Li, Jiaxing, additional, Hou, Yi, additional, Kuang, Wenbin, additional, Wang, Liping, additional, Gu, Wanjian, additional, Li, Zhiyu, additional, and Yang, Peng, additional

Published
2022
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188. The role of junctional adhesion molecule-C in trophoblast differentiation and function during normal pregnancy and preeclampsia

Author

Cao, Chenrui, primary, Dai, Yimin, additional, Wang, Zhiyin, additional, Zhao, Guangfeng, additional, Duan, Honglei, additional, Zhu, Xiangyu, additional, Wang, Jingmei, additional, Zheng, Mingming, additional, Weng, Qiao, additional, Wang, Limin, additional, Gou, Wenjing, additional, Zhang, Haili, additional, Li, Chanjuan, additional, Liu, Dan, additional, and Hu, Yali, additional

Published
2022
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198. Reappraising the Value of Fetal First-Trimester Ultrasonography

Author

Tang, Huirong, Zheng, Mingming, and Pan, Yang

Abstract

In the last few years, the introduction of cell-free DNA has rapidly altered prenatal screening regimens and is increasingly offered as the second- or, at times, even the first-tier screening test. Should an early anomaly scan also be part of an up-to-date screening policy? This paper reappraises the value of fetal first-trimester ultrasonography. The primary aims of the first-trimester scan are to establish gestational age based on the measurement of fetal crown-rump length, to detect multiple pregnancy and chorionicity, and to measure fetal nuchal translucency thickness as part of a combined screening test for chromosomal abnormalities. With recent advancements in ultrasound technology, there is compelling evidence that a majority of fetuses with major structural abnormalities and almost half of them without chromosomal abnormalities can be detected in the first trimester. We focused on the first-trimester screening of fetal major defects, especially including fetal congenital heart disease and cleft lip and palate by ultrasound markers and views. Moreover, it is critical to highlight that after a detailed anomaly scan in the first trimester without major structural anomalies and positive genetic tests, the residual chance of favorable outcome in fetuses with isolated increased nuchal translucency is relatively high. The discussion on the role of cell-free DNA in prenatal screening is still ongoing. Even in the event of it becoming a first-line screening test for aneuploidies, the importance of a first-trimester fetal scan, including assessment of markers for other anomalies, remains undisputed.

Published
2023
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200. Discovery of Dual CDK6/PIM1 Inhibitors with a Novel Structure, High Potency, and Favorable Druggability for the Treatment of Acute Myeloid Leukemia

Author

Yuan, Kai, primary, Ji, Minghui, additional, Xie, Shengnan, additional, Qiu, Zhixia, additional, Chen, Weijiao, additional, Min, Wenjian, additional, Xia, Fei, additional, Zheng, Mingming, additional, Wang, Xiao, additional, Li, Jiaxing, additional, Hou, Yi, additional, Kuang, Wenbin, additional, Wang, Liping, additional, Gu, Wanjian, additional, Li, Zhiyu, additional, and Yang, Peng, additional

Published
2021
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