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Bian, Jin Long,Seo, Yong Jun,Kim, Geun Woo,Sung, Chang Hoon,Kumar, Shalendra,Lee, Chan Gyu,Koo, Bon Heun Elsevier 2011 Current Applied Physics Vol.11 No.1
<P><B>Abstract</B></P><P>Composites of 0.99La<SUB>0.7</SUB>(Ca<SUB><I>x</I></SUB>Sr<SUB>1–<I>x</I></SUB>)<SUB>0.3</SUB>MnO<SUB>3</SUB>/0.01SnO<SUB>2</SUB> (LCSMO/SnO<SUB>2</SUB>) (<I>x</I> = 0, 0.1, 0.2, 0.5, 0.7 and 1) were synthesized using solid-state reaction technique, and then characterized using the X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD and SEM observations show the LCSMO and SnO<SUB>2</SUB> phases are separately distributed in the composites which indicate that there was no chemical interaction occurred during the sintering process. SnO<SUB>2</SUB> is mainly distributed at the grain boundaries and surfaces of the matrix. The resistivity of the composites was measured in the range of 100–350 K by using physical properties measurement system (PPMS). The applied magnetic field is 0T, 0.5T and 1T. Enhanced magnetoresistance (MR) within a wide temperature range was obtained. The observed variation of MR with varying Ca and Sr concentration has been qualitatively investigated.</P> <P><B>Highlights</B></P><P>► Low field magnetoresistance has potential application in highspeed electronic, magnetic and recording devices, etc. ► SnO<SUB>2</SUB> influence the electric and magnetic properties of the manganites composites. ► Enhanced room temperature magnetoresistance at low magnetic field.</P>
Minimal flavored U(1)′ for B -meson anomalies
Bian, Ligong,Choi, Soo-Min,Kang, Yoo-Jin,Lee, Hyun Min American Physical Society 2017 Physical Review D Vol.96 No.7
<P>We consider an anomaly free U(1)' model with favorable couplings to heavy flavors in the Standard Model ( SM), as motivated by B- meson anomalies at LHCb. Taking the U(1)' charge to be Q' = y(L mu - L tau) + x(B-3 - L-3), we can explain theB- meson anomalies without invoking extra charged fermions or flavor violation beyond the SM. We showthat there is a viable parameter space with a small x that is compatible with other meson decays, tau lepton, and neutrino experiments as well as theLHCdimuon searches. We briefly discuss the prospects of discovering the Z' gauge boson at the LHC in the proposed model.</P>
Speed Sensorless Control of a Bearingless Induction Motor Based on Modified Robust Kalman Filter
Bian Yifan,Yang Zebin,Sun Xiaodong,Wang Xiang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
To enhance the speed identifcation accuracy in speed sensorless control of a bearingless induction motor (BIM), a speed sensorless control strategy based on modifed robust Kalman flter is proposed. Firstly, the suboptimal principle of the H∞ control method is introduced into the extended Kalman flter to construct the robust Kalman flter. Secondly, the rotor fux linkage of the BIM in the α-β coordinate system is discretized, which is used as a reference model and adjustable model in the model reference adaptive system. At the same time, the modifed robust Kalman flter is obtained by combining the robust Kalman flter with the model reference adaptive system. Finally, the simulation and experimental results show that the proposed BIM speed sensorless control system based on modifed robust Kalman flter has higher accuracy of speed identifcation than the extended Kalman flter control under diferent operation conditions of no-load, sudden load, speed change, and motor parameter mismatch. The motor also has a good suspension performance.
Bian, Yiying,An, Gwang-Jin,Kim, Keunyoung,Ngo, Thien,Shin, Sue,Bae, Ok-Nam,Lim, Kyung-Min,Chung, Jin-Ho Pergamon 2019 Food and Chemical Toxicology Vol. No.
<P><B>Abstract</B></P> <P>Ginseng and its active gradient, ginsenoside Rg3 (Rg3), are widely used for a variety of health benefits, but concerns over their misuses are increasing. Previously, it has been reported that Rg3 can cause hemolysis, but its health outcome remains unknown. Here, we demonstrated that Rg3 could promote the procoagulant activity of erythrocytes through the process of hemolysis, ultimately leading to increased thrombosis. In freshly isolated human erythrocytes, Rg3 caused pore formation and fragmentation of the erythrocyte membrane. Confocal microscopy observation and flow cytometric analysis revealed that remnant erythrocyte fragments after the exposure to Rg3 expressed phosphatidylserine (PS), which can promote blood coagulation through providing assembly sites for coagulation complexes. Rat <I>in vivo</I> experiments further confirmed that intravenous administration of Rg3 produced PS-bearing erythrocyte debris and increased thrombosis. Collectively, we demonstrated that Rg3 could induce the procoagulant activity of erythrocytes by generating PS-bearing erythrocyte debris through hemolysis, which might provoke thrombosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ginsenoside Rg3, an active ingredient of ginseng, can induce PS bearing erythrocyte fragments through hemolysis. </LI> <LI> PS-bearing erythrocyte fragments resulting from Rg3 exposure can accelerate thrombin generation and increase adherence of erythrocytes to endothelial cells. </LI> <LI> Rg3 administration potentiated thrombus formation rat <I>in vivo.</I> </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Structural Mechanisms of the Cooling Rate Effect on the Deformation Behaviors in Metallic Glasses
Bian Zhou,Ming‑fei Li,Fan Xiong,Liang Yang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
In this work, the structural mechanisms of the cooling rate effect on the deformation behaviors in metallic glasses (MGs) isstudied, by performing the synchrotron radiation-based experiments coupled with a series of simulations. It is found that aMG prepared at lower cooling rate has the higher yield strength and is more likely to soften itself, resulting in lower plasticity.This is because some atomic-to-cluster level structural factors, such as coordination numbers, atomic packing efficiencies,cluster concentrations and regularities. In addition, a quantitative analysis reveals that higher cooling rate leads to more freevolumes, and significantly affect the evolution of free volumes during the compressive deformation, tuning the formationand the evolution of shear transformation zones, as well as the yield strength and the plasticity.