The symmetrical bipolar configuration shows a great advantage in modular multilevel converter (MMC) based high-voltage dc-current (HVDC) transmission.In a bipolar MMC-HVDC system, station internal ac grounding faults cause sub-module (SM) capacitors to discharge violently.These faults do great harm to MMCs and require special protection schemes.In
The paper presents the results of the first in history and theory of 3 nef runes psychological science research of genesis and specific of the main forms of social and psychological thinking, which were formed in the foreign and national social and cultural space, of prerequisites and perspectives of their development, interaction and mutual enrich
The core task of object detection is to extract features of various sizes by hierarchically stacking multi-scale feature maps.However, it is not easy to decide whether we should transmit semantic information to the low layers while 49ers gold hex code reducing the loss of semantic information of the high-level features.In this paper, we present a n
Regulatory T (Treg) cells maintain immune homeostasis by suppressing iphone 14 pro max las vegas excessive immune responses.Treg cells induce tolerance against self- and foreign antigens, thus preventing autoimmunity, allergy, graft rejection, and fetus rejection during pregnancy.However, Treg cells also infiltrate into tumors and inhibit antitumor