Collective dynamics in multi-population Hamiltonian systems

Tian Jing,Ying Jiaqi,Qiao Tianli,Qiu Haibo 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.12

In this paper, we investigate measure synchronization (MS) in a two-population network of coupled metronomes system. The system consists of N identical metronomes placed on two swing boards, and the two swings are connected by spring of stifness k. Metronomes on each swing represents a single population. We mainly study the collective dynamics of multipopulation Hamiltonian induced by increased couplings, including inter-population and intra-population couplings. It is found that by tuning K for the inter-population coupling intensity and R for the intra-population coupling intensity, the system reaches various MS states at certain critical coupling intensities, including partial MS and complete MS. The occurrence of partial and complete MS are discussed particularly by analyzing the Poincaré sections of the Hamiltonian system. In addition, we fnd correspondence in between the phase-locking dynamics and various MS transitions.

Activating SIRT3 in peritoneal mesothelial cells alleviates postsurgical peritoneal adhesion formation by decreasing oxidative stress and inhibiting the NLRP3 inflammasome

Shen Tianli,Wu Yunhua,Wang Xingjie,Wang Zijun,Li Enmeng,Zhou Cancan,Yue Chenyang,Jiang Zhengdong,Wei Guangbing,Lian Jie,Xu Qinhong,Li Xuqi 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-

Peritoneal adhesions (PAs) are a serious complication of abdominal surgery and negatively affect the quality of life of millions of people worldwide. However, a clear molecular mechanism and a standard therapeutic strategy for PAs have not been established. Here, we developed a standardized method to mimic the pathological changes in PAs and found that sirtuin 3 (SIRT3) expression was severely decreased in adhesion tissues, which was consistent with our bioinformatics analysis and patient adhesion tissue analysis. Thus, we hypothesized that activating SIRT3 could alleviate postsurgical PAs. Sirt3-deficient (Sirt3−/−) mice exhibited many more PAs after standardized abdominal surgery. Furthermore, compared with wild-type (Sirt3+/+) mice, Sirt3-deficient (Sirt3−/−) mice showed more prominent reactive oxygen species (ROS) accumulation, increased levels of inflammatory factors, and exacerbated mitochondrial damage and fragmentation. In addition, we observed NLRP3 inflammasome activation in the adhesion tissues of Sirt3−/− but, not Sirt3+/+ mice. Furthermore, mesothelial cells sorted from Sirt3−/− mice exhibited impaired mitochondrial bioenergetics and redox homeostasis. Honokiol (HKL), a natural compound found in several species of the genus Magnolia, could activate SIRT3 in vitro. Then, we demonstrated that treatment with HKL could reduce oxidative stress and the levels of inflammatory factors and suppress NLRP3 activation in vivo, reducing the occurrence of postsurgical PAs. In vitro treatment with HKL also restored mitochondrial bioenergetics and promoted mesothelial cell viability under oxidative stress conditions. Taken together, our findings show that the rescue of SIRT3 by HKL may be a new therapeutic strategy to alleviate and block postsurgical PA formation.

Multi-Epitope Fusion Protein Eg mefAg-1 as a Serodiagnostic Candidate for Cystic Echinococcosis in Sheep

Liu Tianli,Wang Xifeng,Tian Zhenzhong,Wang Lixia,Zhang Xingxing,Qiao Jun,Meng Qingling,Gong Shasha,Chen Ying,Cai Xuepeng 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.1

Cystic echinococcosis (CE) in sheep is a hazardous zoonotic parasitic disease that is caused by Echinococcus granulosus (Eg). At present, serological test is an important diagnostic method for Eg infection in domestic animals. Here, a fusion protein Eg mefAg-1 harboring 8 dominant B-cell epitopes of Eg such as antigen B, tetraspanin 1, tetraspanin 6, reticulon and Eg95 was produced in E. coli and evaluated for CE in sheep by indirect ELISA. Eg mefAg-1 showed in ELI- SA a high sensitivity (93.41%) and specificity (99.31%), with a coincidence rate of 97.02%. Overall, it is suggested that the Eg mefAg-1 could be a potential antigen candidate for CE serodiagnosis in sheep.

청말민초(清末民初) 시기 의회식 입법기관의 기원과 운영

딩톈리 ( Ding Tianli ) 중국사학회 2021 中國史硏究 Vol.- No.130

아편전쟁 이후, 청 정부는 위기를 극복하기 위해 많은 정치 개혁 운동을 시작했고, 특히 서구적 근대화의 정치적 모델을 그 개선의 근간이자 근원으로 본받고자 하였다. 변법자강운동(무술변법)과 청말에서 북양 정부까지 이어진 헌법 운동, 자정원의 의회 입법 체계, 그리고 자의국, 참의원 등은 중국으로 하여금 서구적 정치 개념에 대한 새로운 이해를 갖게 했다. 의회식 ‘입법’은 중국 도입 초기에 문화적 고통을 수반하며 이식에서 난항을 겪었고, 전 국가적으로 근대화의 대명사가 되었다. 서구의 새로운 입법 형태를 수용하는 과정에서 형성된 ‘헌법주의’ 정치사상의 인식과 변형은 청말 개혁파에 의한 ‘민권’의 도입 및 자정원의 ‘여론’ 존중과 함께 이루어졌다. 청말민초 입법기관의 기원 및 운영과 서양식 시스템의 도입에 대한 연구는 중국의 ‘헌법주의’를 역사적으로 풀어내는데 있어서 중요한 실질적 연결고리이면서, 동시에 근대 이후 중국 전체의 새로운 ‘입법’ 시스템을 탐구하는 것에도 직접적인 영향을 준다. After the Opium War, the Qing government began a number of political reform movements to save the peril, especially to emulate the political model of Westernization modernization as the bas is and source of its improvement. During the period of the Reform Movement of 1898, the Constitutional Movement in the late Qing Dynasty and the Bei Yang Government, the parliamentary legislative system of the Zi Zheng Yuan, the Consultation and the Senate made the ancient China have a new understanding of the political concept of Western learning. At the beginning of the introduction of China, “legislation” experienced cultural pains and difficult transplants and became the epitome of the modernization process of the whole country. The recognition and transformation of the "constitutional" political thinking formed in the process of accepting the Western new legislative model is accompanied by the introduction of "civil rights" by the reformists in the late Qing Dynasty and the respect of the "public opinion" by the Zi Zheng Yuan. This is not only an important practical link in China’s “constitutional” historical approach, but also directly affects the exploration of “legislation” in China as a whole since modern times.

Graphene quantum dots decorated 3D transitional metal (Fe, Co) oxide graphene nanoribbons for oxygen reduction reaction

Xiyu Zhao,Changrui Lu,Jing Li,Caiyun Liu,Cheng Cao,Tianli Wu 한국탄소학회 2023 Carbon Letters Vol.33 No.1

In this paper, we presented a hybrid composite of graphene quantum dots (GQDs)-modified three-dimensional graphene nanoribbons (3D GNRs) composite linked by Fe3O4 and CoO nanoparticles through reflux and ultrasonic treatment with GQDs, denoted as 3D GQDs-Fe3O4/CoO@GNRs (3D GFCG). In this hybrid, the 3D GNRs framework strengthened the electrical conductivity and the synergistic effects between GQDs and 3D GFCG enhanced the oxygen reduction reaction (ORR) activity of the nanocomposite. The results imply that decorating GQDs with other electro-catalysts is an effective strategy to synergistically improve their ORR activity.

Prevalence of Hydatid Cysts in Livestock Animals in Xinjiang, China

Meng Qingling,Wang Guanglei,Qiao Jun,Zhu Xinquan,Liu Tianli,Song Xuemei,Zhang Jinsheng,Wang Huisheng,Cai Kuojun,Chen Chuangfu 대한기생충학열대의학회 2014 The Korean Journal of Parasitology Vol.52 No.3

The Specific Case Analysis of Biomineralization Induced by Sulfate Reducing Bacteria

( Hongwei Liu ),( Shuang Qin ),( Chaoyang Fu ),( Fei Xiao ),( Deli Wang ),( Xia Han ),( Tianli Wang ),( Hongfang Liu ) 한국부식방식학회(구 한국부식학회) 2017 Corrosion Science and Technology Vol.16 No.6

The effects of sulfate reducing bacteria (SRB) on the corrosion and scaling of the Q235 carbon steel has been investigated in the simulated sewage water and oil field gathering pipelines production water, using scanning electron microscopy (SEM), energy dispersive x-ray spectrometry (EDS), and three-dimensional stereoscopic microscope. Results indicated that the concentration of SRB reached the maximum value on the ninth day in simulated sewage water with a large amount of scaling on the surface of specimen. In oil field gathering pipelines, a large amount of scaling and mineralization of mineral salts and thick deposition of extracellular polymeric substance (EPS) layers were also observed on the surface of specimen. The thickness of biofilm was about 245 μm within 30 days. After adding microbicides, the thickness of corrosion products film was only up to 48 - 106 μm within 30 days, suggesting that SRB could induce biomineralization. Under-deposit corrosion morphology was uniform in the absence of microbicides while local corrosion was observed in the presence of microbicides.

Measurement of TOF of fast neutrons with ²³⁸U target

Li, Meng,Guan, Yuanfan,Lu, Chengui,Zhang, Junwei,Yuan, Xiaohua,Duan, Limin,Yang, Herun,Hu, Rongjiang,He, Zhiyong,Wei, Xianglun,Ma, Peng,Gan, Zaiguo,Yang, Chunli,Zhang, Hongbin,Chen, Liang,Qiu, Tianli Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6

We developed a Dual-PPACs detector for fast neutron measurements that consists of two sets of PPAC: conventional PPAC and fission PPAC. A²³⁸U(U₃O₈) coating is placed in the fission PPAC's anode, which is used as the neutrons conversion layer. An experiment was performed to measure neutron time-of-flight (TOF) in which ²⁵²Cf spontaneous fission source was used. An excellent time resolution of 164ps has been observed at 6 mbar in isobutene gas. With the excellent time resolution of Dual-PPACs detector, exact neutron energy can be extracted from the timing measurement. The experimental detection efficiency was 1.9 × 10^-7, consistent with the efficiency of 2.5 × 10^-7 given by a Geant4 simulation. Ultimately, the results show that the Dual-PPACs detector is a suitable candidate for measuring fast neutrons in the future CiADS system.

Modal pushover analysis of self-centering concentrically braced frames

Tian, Li,Qiu, Canxing Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.3

Self-centering concentrically braced frames (SCCBFs) are emerging as high performance seismically resistant braced framing system, due to the capacity of withstanding strong earthquake attacks and promptly recovering after events. To get a further insight into the seismic performance of SCCBFs, systematical evaluations are currently conducted from the perspective of modal contributions. In this paper, the modal pushover analysis (MPA) approach is utilized to obtain the realistic seismic demands by summarizing the contribution of each single vibration mode. The MPA-based results are compared with the exact results from nonlinear response history analysis. The adopted SCCBFs originate from existing buckling-restrained braced frames (BRBF), which are also analyzed for purpose of comparison. In the analysis of these comparable framing systems, interested performance indices that closely relate to the structural damage degree include the interstory drift ratio, floor acceleration, and absorbed hysteretic energy. The study shows that the MPA approach produces acceptable predictions in comparison to the exact results for SCCBFs. In addition, the high-modes effect on the seismic behavior increases with the building height, and is more evident in the SCCBFs than the BRBFs.

Analysis of Harmonic Transfer Characteristics and RAPF Installation Strategy in Power Systems

Tian Li,Wanjun Lei,Nie Cheng,Xiaojie Zhang,Guoqing Gao,F. Kai Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Power quality has become a new threat because of the distributed nature of disturbances caused by nonlinear loads and DGs. When harmonics are transmitted in a distribution network, they’ll be magnified by resonance between line capacitance and inductance, then worsen the harmonic in power systems. In this paper, a mathematical model for harmonic transfer characteristics of power system feeders is firstly established. Meanwhile, analyze the harmonic voltage propagation caused respectively by the background harmonic voltage source and harmonic current source, which provides an important theoretical basis for the treatment of harmonic pollution. In addition, a strategy is proposed to guide the optimal installation position and setting of external resistance of RAPF to achieve the minimum total distortion rate in the entire distribution network system, which can damp the harmonic resonant effectively. Simulation and experiments have been performed to verify the theoretical analysis and demonstrate the effectiveness of the proposed strategy.