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Understanding systemic risk induced by climate change

Advances in Climate Change Research 2021年第3期12卷 384-394页

作者： LI hui-Min wang Xue-Chun ZHAO Xiao-Fan qi Ye Beijing Climate Change Response Research and Education Center Beijing University of Civil Engineering and ArchitectureBeijing100044China School of Public Policy and Management Tsinghua UniversityBeijing100084China Division of Public Policy The Hong Kong University of Science and TechnologyHong KongChina Institute for Public Policy The Hong Kong University of Science and Technology(Guangzhou)GuangzhouChina

The systemic risk induced by climate change represents one of the most prominent threats facing humanity and has attracted increasing attention since the outbreak of the COVID-19 pandemic at the end of *** existing literature highlights the importance of systemic risk induced by climate change,but there are still deficiencies in understanding its dynamics and assessing the *** to bridge this gap,this study develops a theoretical framework and employs two cases to illustrate the concept,origin,occurrence,propagation,evolution,and assessment framework of systemic risk induced by climate *** key findings include:1)systemic risk induced by climate change derives from the rapid growth of greenhouse gas,emissions,increasingly complex connections among different socioeconomic systems,and continuous changes in exposure and vulnerability;2)systemic risk induced by climate change is a holistic risk generated by the interconnection,interaction,and dynamic evolution of different types of single risks,and its fundamental,defining feature is cascading *** extent of risk propagation and its duration depend on the characteristics of the various discrete risks that are connected to make up the systemic risk;3)impact domains,severity of impact,and probability of occurrences are three core indicators in systemic risk assessment,and the impact domains should include the economy,society,homeland security,human health,and living *** propose to deepen systemic risk research from three aspects:to develop theories to understand the mechanism of systemic risk;to conduct empirical research to assess future risks;and to develop countermeasures to mitigate the risk.

关键词： Systemic risk Climate change Disaster Risk assessment

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Attitude Coordination of Multi-HUG Formation Based on Multibody System Theory

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China Ocean Engineering 2017年第2期31卷 248-255页

作者： XUE Dong-yang WU Zhi-liang qi Er-mai wang Yan-hui wang Shu-xin Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin University Tianjin 300072 China School of Mechanical Engineering Tianjin University Tianjin 300072 China National Ocean Technology Center Tianjin 300112 China

Application of multiple hybrid underwater gliders （HUGs） is a promising method for large scale, long-term ocean survey. Attitude coordination has become a requisite for task execution of multi-HUG formation. In this paper, a multibody model is presented for attitude coordination among agents in the HUG formation. The HUG formation is regarded as a multi-rigid body system. The interaction between agents in the formation is described by artificial potential field （APF） approach. Attitude control torque is composed of a conservative torque generated by orientation potential field and a dissipative term related with angular velocity. Dynamic modeling of the multibody system is presented to analyze the dynamic process of the HUG formation. Numerical calculation is carried out to simulate attitude synchronization with two kinds of formation topologies. Results show that attitude synchronization can be fulfilled based on the multibody method described in this paper. It is also indicated that different topologies affect attitude control quality with respect to energy consumption and adjusting time. Low level topology should be adopted during formation control scheme design to achieve a better control effect.

关键词： hybrid underwater gliders (HUGs) formation attitude coordination multibody system Kane's equation

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Optimal energy-efficient scheme for two-way relay channel using physical layer network coding

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The Journal of China Universities of Posts and Telecommunications 2011年第6期18卷 51-58页

作者： ZHOU Min CUI qi-mei wang hui TAO Xiao-feng TIAN hui MIKKO Valkama Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications Beijing 100876 China Department of Communications Engineering Tampere University of Technology Tampere PF1-33101 Finland

Systems are always designed and optimized based on full traffic load in the current literatures. However, practical systems are seldom operating at full load, even at peak traffic hours. Instead of maximizing system rate to achieve the full load, an optimal energy-efficient scheme to minimize the transmit power with required rates is investigated in this article. The considered scenario is a two-way relay channel using amplify-and-forward protocol of physical layer network coding, where two end nodes exchange messages via multiple relay nodes within two timeslots. A joint power allocation and relay selection scheme is designed to achieve the minimum transmit power. Through convex optimization theory, we firstly prove that single relay selection scheme is the most energy-efficient way for physical layer network coding. The closed-form expressions of power allocation are also given. Numerical simulations demonstrate the performance of the designed scheme as well as the comparison among different schemes.

关键词： energy-efficient two-way relay channel physical layer network coding power allocation relay selection rate constraints

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大射电望远镜馈源精调系统虚拟仿真的研究

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系统仿真学报 2002年第12期14卷 1671-1673页

作者：武建新张辉王启明汪劲松内蒙古工业大学机械学院呼和浩特010062 清华大学精密仪器与机械学系北京100084

提出了通过网络在两台PC机之间实现实时控制系统仿真的思想,给出了大射电望远镜馈源精调系统虚拟仿真环境的结构和设计思路,并论述了实时控制系统虚拟仿真环境的几个主要问题及其实现细节,包括:运动学建模、Open GL动态建模、网络传输... 详细信息

提出了通过网络在两台PC机之间实现实时控制系统仿真的思想,给出了大射电望远镜馈源精调系统虚拟仿真环境的结构和设计思路,并论述了实时控制系统虚拟仿真环境的几个主要问题及其实现细节,包括:运动学建模、Open GL动态建模、网络传输、时域仿真。

关键词：大射电望远镜馈源精调系统虚拟仿真计算机仿真几何建模

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Stability analysis of linear/nonlinear switching active disturbance rejection control based MIMO continuous systems

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Journal of Systems Engineering and Electronics 2021年第4期32卷 956-970页

作者： WAN hui qi Xiaohui LI Jie Department of Unmanned Aerial Vehicle Engineering Army Engineering University of PLAShijiazhuang 050003China The 32nd Research Institute China Electronics Technology Group CorporationShanghai 201800China

In this paper,a linear/nonlinear switching active disturbance rejection control(SADRC)based decoupling control approach is proposed to deal with some difficult control problems in a class of multi-input multi-output(MIMO)systems such as multi-variables,disturbances,and coupling,***,the structure and parameter tuning method of SADRC is introduced into this *** on this,virtual control variables are adopted into the MIMO systems,making the systems *** the SADRC controller is designed for every *** this,a stability analyzed method via the Lyapunov function is proposed for the whole ***,some simulations are presented to demonstrate the anti-disturbance and robustness of SADRC,and results show SADRC has a potential applications in engineering practice.

关键词： linear/nonlinear switching active disturbance rejection control(SADRC) multi-input multi-output(MIMO)continuous system decoupling control stability analysis

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Acceptor-acceptor-type conjugated polymer semiconductors

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Journal of Energy Chemistry 2021年第8期30卷 364-387,I0008页

作者： Dunshuai Qu Ting qi hui Huang School of Chemical Sciences University of Chinese Academy of Sciences100049 BeijingChina College of Materials Science and Opto-Electronic Technology&Center of Materials Science and Optoelectronics Engineering&CAS Center for Excellence in Topological Quantum Computation&CAS Key Laboratory of Vacuum Physic University of Chinese Academy of Sciences100049 BeijingChina

The rapid development of electronic devices such as organic field-effect transistors(OFETs)and solar cells makes the research and development of electronic transport materials *** acceptor-acceptortype(AàA-type)conjugated n-type polymer semiconductors have caught much attention due to the outstanding advantages on excellent electron-accepting capabilities,the precise adjustment of energy levels and the mass production at low fabrication *** article systematically reviews the polymerization methods of AàA-type polymers and the recent advancements applied in OFETs and polymer solar cells(PSCs).The analyses of the synthesis and the relationship between device performances and polymer molecular structures may provide a constructive guidance for the further development of highperformance n-type polymer materials.

关键词： Acceptor-acceptor-type(A-A-type) polymers Organic field-effect transistors(OFETs) Polymer solar cells(PSCs) Polymerization n-Type semiconductors

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Aminoacyl-tRNA Synthetase-based Prognosis Model and Exploration of Potential Mechanisms in Hepatocellular Carcinoma

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Journal of Clinical and Translational Hepatology 2023年第4期11卷 877-888页

作者： Yixun Jin Xinyang Huang Zhuoxin wang hui Xu qi wang Lifu wang Department of Gastroenterology Ruijin Hospital Affiliated to The Shanghai Jiao Tong University School of MedicineShanghaiChina

Background and Aims:Aminoacyl-tRNA synthetases(ARSs)participate in tumor initiation and progression but their involvement in hepatocellular carcinoma(HCC)is not *** study aimed to investigate the prognostic value and underlying mechanisms of ARS in ***:Data were obtained from The Cancer Genome Atlas(TCGA),International Cancer Genome Consortium,Gene Expression Omnibus and Human Protein Atlas *** prognostic model was constructed with the use of Cox regression and least absolute shrinkage and selection operator ***-Meier survival analysis,enrichment analysis,single sample gene set enrichment analysis and tumor mutation burden calculation were performed with R to evaluate the model and explore the underlying *** tests were used for comparisons between ***:Aspartyl-tRNA synthetase 2(DARS2),tyrosyl-tRNA synthetase 1(YARS1)and cysteinyl-tRNA synthetase 2(CARS2)were identified as prognostic biomarkers and enrolled in model *** area under receiver operating characteristic curve of the model was *** model was used to assign patients from TCGA into low-and high-risk *** in the high-risk group had a worse prognosis(p<0.001).The clinical significance of the model was tested in different clinical *** mutation analysis had a higher TP53 mutation frequency in high-risk *** analysis and study of immune-related cells and molecules found that the high-risk group was characterized by immune-cell infiltration and immunosuppression ***:A novel ARS family-based model of HCC prognosis was ***53 mutation frequency and immune-suppressive status accounted for a worse prognosis in patients included in the high-risk group.

关键词： Bioinformatic analysis Hepatocellular carcinoma Amino acyl-tRNA synthetases Prognosis Immunosuppression

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Dynamic stress concentration of an elliptical cavity in a semi-elliptical hill under SH-waves

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 347-359页

作者： qi hui Chu Fuqing Guo Jing College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China

The method of wave-function expansion in elliptical coordinates,elliptical cosine half-range expansion and Mathieu function were applied to obtain an exact analytical solution of the dynamic stress concentration factor(DSCF)around an elliptical cavity in a shallow,semi-elliptical *** infinite system of simultaneous linear equations for solving this problem was established by substituting the wave expression obtained by the Mathieu function including the standing wave expression of elliptical lining given herein into the boundary condition obtained by the region-matching *** finite equations system with unknown coefficients obtained by truncation were solved numerically,and the results in the case of an ellipse degenerating into a circle were compared with previous results to verify the accuracy of the *** effects of different aspect ratios,incident wave angles and aperture ratios on the dynamic stress concentration around the elliptical cavity were *** numerical results,when the elliptical hill was changed into a circular one,were analyzed and compared in *** engineering,this model can be regarded as a semi-cylindrical hill with an elliptical cylindrical unlined tunnel under the action of SH waves,and the results are significant in aseismic design.

关键词： SH waves dynamic stress concentration factor(DSCF) elliptical coordinate Mathieu function

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Novel Protein C6ORF120 Promotes Apoptosis through Mitochondria-dependent Pathway in CD4+ T Lymphocytes

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Biomedical and Environmental Sciences 2023年第7期36卷 639-643页

作者： LIU hui wang Xin wang Peng wang Yu qi YI Yun Yun LI Xin Department of Center of Integrated Traditional Chinese and Western Medicine Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Department of Center of Integrated Traditional Chinese and Western Medicine Peking University Ditan Teaching HospitalBeijing 100015China

Generally,a healthy immune system should be in dynamic balance,which can be maintained by both promoting and resisting *** apoptosis is indispensable for maintaining homeostasis[1]and participates in the entire process of lymphocyte differentiation,development,maturation,and immune *** has been reported that a large amount of lymphocyte apoptosis occurs in lymphoid organs during severe trauma[2].Lymphocytes consist of T and B lymphocytes,among which CD4^(+)T cells were the focus of this ***4^(+)T lymphocytes play an important role in the innate *** of CD4^(+)T lymphocytes is an important biological process that induces CD4^(+)T cell depletion[3].Numerous studies have shown that CD4^(+)T cell apoptosis participates in many pathological processes of diseases such as HIV infection,cancer,and systemic sclerosis[4].Classical apoptosis is induced by factors that can activate several pathways,including the mitochondrial,endoplasmic reticulum,and death receptor pathways[5].The mitochondrial pathway is mainly activated by the Bcl-2 family[6].The endoplasmic reticulum(ER)pathway is affected by endoplasmic reticulum *** external factors can trigger the death receptor pathway,such as the binding of TNF-TNFR and the combination of Fas-FasL[7].Considering these pathways,it is feasible to study the specific mechanisms of lymphocyte apoptosis,primarily in CD4^(+)T cells.

关键词： Apoptosis lymphocytes organs

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A practical and effective method for reducing differential reflectance spectroscopy noise

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Nanotechnology and Precision Engineering 2022年第1期5卷 49-53页

作者： hui qi Xing Fu State Key Laboratory of Precision Measurement Technology and Instruments Tianjin UniversityTianjin 300072China Tianjin Research Center of MicroNano Manufacturing Technology Tianjin UniversityTianjin 300072China

Differential reflectance spectroscopy(DRS)is a powerful tool to study processes during thin-film growth,especially that of transition metal dichalcogenides and organic thin *** satisfy the requirements for in situ and real-time monitoring of film growth,including spectral resolution and sensitivity at the level of monolayers and even sub-monolayers,the most challenging technical task in DRS is to reduce noise to an extremely low level so that the best possible signal-to-noise ratio can be *** this paper,we present a simplified and cost-effective DRS apparatus,with which we show that the measurement noise is mainly composed of thermal drift noise and explore the temperature-dependence of the DRS *** on the results obtained,we propose an easily realized and effective scheme aiming to reduce the *** results demonstrate that this scheme is effective in stabilizing reliable signals for a long period of several *** noise reduction is achieved,with the typical average noise of the DRS system being decreased to 0.05%over several *** improved DRS system is applied to study the growth of an organic semiconductor layer for an organic field-effect transistor *** results indicate that the apparatus proposed in this paper has potential applications in fabrication of devices on the nanoscale and even the sub-nanoscale.

关键词： Differential reflectance spectroscopy Thin-film measurement technique In situ spectroscopy High vacuum Noise reduction OFET

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