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Research on the Influence of Multiple Parameters on the Responses of a B-type Subway Train

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 329-346页

作者： Yanwen Liu Bing Yang Shoune Xiao Tao Zhu Guangwu Yang Ruixian Xiu State Key Laboratory of Traction Power Southwest Jiaotong University Basic R&D Department National Railway Passenger Car Engineering Research CenterChangchun Railway Vehicles Co.Ltd College of Engineering Changchun Normal University

To obtain improved comprehensive crashworthiness criteria for a B-type subway train, the influence laws of the vehicle design collision weight M and empty stroke D on the train’s collision responses were investigated, and multiobjective optimization and decision-making were performed to minimize TS(total compression displacement along the moving train) and TAMA(the overall mean acceleration along the moving train). Firstly, a one-dimensional train collision dynamics model was established and verified by comparing with the results of the finite element model. Secondly, based on the dynamics model, the influence laws of M and D on the collision responses, such as the energy-absorbing devices’ displacements and absorbed energy, vehicles’ velocity and acceleration, TS, TAMA and the coupling correlation effect were investigated. Then, surrogate models for TS and TAMA were developed using the optimal Latin hypercube method(OLHD) and response surface method(RSM), and multi-objective optimization was conducted using the particle swarm optimization algorithm method(MPOSO). Finally, the entropy method was used to obtain the weight coefficients for TS and TAMA, and multi-objective decision-making was performed. The results indicate that D and M significantly affect the compression displacements and energy absorption of the first three collision interfaces, but have limited impact on the last three collision interfaces. The velocity versus time curves of vehicle M1 and M2 are shifted and parallel with different D. However, the velocity versus time curves of all the vehicles are shifted but gradually divergent with different M. The maximum collision instantaneous accelerations of the vehicles are directly determined by M, but are only slightly affected by D. Under the coupling effect, all concerned collision responses are strongly correlated with M; however, the responses are weakly correlated with D except for the compression displacement at the M2-M3 collision interface and th

关键词： Train collision response Multi-body dynamics model Experiment design Surrogate model Multi-objective optimization Entropy method Multi-objective decision-making

Light People: Academician Junhao Chu

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Light(Science & Applications) 2023年第6期12卷 955-964页

作者： Hui Wang Rongjun Zhang Cun Yu changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences3888 Dong Nan Hu Road130033 ChangchunChina Fudan University 220 Handan RoadYangpu District200433 ShanghaiChina

Editorial The industrial revolutions of steam power,electric power and digital power have been three key steps in the development of science and ***,the fourth industrial revolution has quietly begun,a revolution which will combine the powers of modern technologies such as the Internet,industrial digitalization and virtual reality to trigger a major change of science and technology,and sensor technology is of vital importance to this process.

关键词： Academician revolution steps

Effect of strontium substitution on the activity of La_(2-x)Sr_xNiO_4(x=0.0-1.2)in NO decomposition

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Science China Chemistry 2007年第1期50卷 41-46页

作者： ZHU JunJiang 1 ,YANG XiangGuang 2 ,XU XueLian 3 &WEI KeMei 1 1 National Research Center of Chemical Fertilizer Catalysts,Fuzhou University,Fuzhou 350002,China 2 changchun Institute of Applied Chemistry,Chinese Academy of Sciences,changchun 130022,China 3College of Chemistry&Chemical Engineering,Fuzhou University,Fuzhou 350002,China National Research Center of Chemical Fertilizer Catalysts Fuzhou University Fuzhou China changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun China College of Chemistry & Chemical Engineering Fuzhou University Fuzhou China

The aim of this work is to study the effect of Sr substitution on the redox properties and catalytic ac- tivity of La2-xSrxNiO4(x=0.0-1.2)for NO *** suggest that the x=0.6 sample shows the highest *** characterization(TPD,TPR,etc.)of samples indicates that the x=0.6 sample possesses suitable abilities in both oxidation and reduction,which facilitates the proceeding of oxygen desorption and NO *** temperature below 700℃,the oxygen desorption is difficult, and is the rate-determining step of NO *** the increase of reaction temperature(T> 700℃),the oxygen desorption is favorable and,the active adsorption of NO on the active site(NO+Vo+ Ni2+→NO^--Ni3+)turns out to be the rate-determining *** existence of oxygen vacancy is the prerequisite condition for NO decomposition,but its quantity does not relate much to the activity.

关键词： NO decomposition La2-xSrxNiO4 TPD TPR oxygen vacancy

NDI-induced Topological Conversion of Human Telomeric G-Quadruplexes from Hybrid-2 to Parallel Form

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Chemical Research in Chinese Universities 2021年第3期37卷 795-800页

作者： HAO Xueyu LI Chunjie WANG Yu ZHANG Feng HOU Jingwei KANG Chunqing GAO Lianxun Laboratory of Polymer Composite and Engineering Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022P.R.China University of Science and Technology of China Hefei230026P.R.China

G-Quadruplexes(GQs),which are formed by G-rich DNA sequences in human telomeres,have become an attractive target for cancer *** ligands to stabilize the conformation of human telomeric GQs in vivo are particularly important for structure-based ligand design and drug development targeting the noncanonical DNA *** we report the conformational conversion of Tel26 induced by a naphthalene diimide(NDI)ligand in K^(+)buffer,even at cellular physiological temperature(37℃)and under mimetic cellular crowding conditions created by Ficoll *** provide an insight into the dynamic conversion from initial hybrid-2 GQ topology to final parallel GQ *** results are helpful for the design of ligands with GQ conformation regulation.

关键词： G-Quadruplex Naphthalene diimide Topological conversion Telomeric DNA

Effect of dipole-dipole interaction among atoms on atomic dynamics and entropy evolution of the field

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Chinese Science Bulletin 1996年第14期41卷 1165-1170页

作者：衣学喜孙昌璞 Institute of Theoretical Physics Northeast Normal University Changchun 130024 China

New developments in the high techniques associated with quantum optics have made it possible to produce a high-Q cavity with an extremely small size comparable to the wavelength of atomic emission. In such cavities with so small size, many distinctive phenomena of atomic motion interacting with cavity field appear to be quite attractive. The Jaynes-Cummings model describes the interaction of a two-level atom with a single mode field. When two atoms enter the domain of the cavity field simultaneously, and interact with each other through the dipole-dipole coupling with the exchange of

关键词： dipole-dipole interaction field entropy.

ON THE EXISTENCE OF NONTRIVIAL PERIODIC SOLUTIONS OF DIFFERENTIAL DIFFERENCE EQUATIONS

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Chinese Annals of Mathematics,Series B 1990年第4期11卷 438-444页

作者：王克 Department of Mathematics Northeast Normal UniversityChangchunJilinChina.

This paper cosiders the existence of nontrivial periodic solutions of the differentialdifference equationsx′(t)=-f(x(t-1)),x′(t)=-(f(x(t-1)+f(x(t-2))),and(x′(t)=f(x(t),y(t),x(t-1),y(t-1)),y′(t)=g(x(t),y(t),x(t-1),... 详细信息

关键词： nontrivial proof unbounded ordinary 云一必华 Fixed 耐公 belongs 七气

Canonical Huffman code based full-text index

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Progress in Natural Science:Materials International 2008年第3期18卷 325-330页

作者： Yi Zhang a,b, Zhili Pei a, Jinhui Yanga, Yanchun Liang a, a College of Computer Science and Technology, Jilin University, Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education, changchun 130012, China b Department of Computer Science, Jilin Technology and Business College, changchun 130062, China College of Computer Science and Technology Jilin University Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education Changchun 130012 China Department of Computer Science Jilin Technology and Business College Changchun 130062 China

Full-text indices are data structures that can be used to find any substring of a given string. Many full-text indices require space larger than the original string. In this paper, we introduce the canonical Huffman code to the wavelet tree of a string T[1. . .n]. Compared with Huffman code based wavelet tree, the memory space used to represent the shape of wavelet tree is not needed. In case of large alphabet, this part of memory is not negligible. The operations of wavelet tree are also simpler and more efficient due to the canonical Huffman code. Based on the resulting structure, the multi-key rank and select functions can be performed using at most nH0 + jRj(lglgn + lgn lgjRj)+O(nH0) bits and in O(H0) time for average cases, where H0 is the zeroth order empirical entropy of T. In the end, we present an efficient construction algorithm for this index, which is on-line and linear.

关键词： Full-text index Su?x automaton Canonical Hu?man code

Room-temperature NH_3 sensors with high sensitivity and short response/recovery times

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Chinese Science Bulletin 2014年第4期59卷 447-451页

作者： Qingcheng Liang Di Li Shang Gao Dayong Jiang Jianxun Zhao Jieming Qin Jianhua Hou School of Materials Science and Engineering Changchun University of Science and Technology

Micro-sensors are fabricated by co-electrospinning In2O3and SnO2nanofibers on the substrates of SiO2/Si with interdigitated Pt signal *** total sensor area is 1.36 mm 9 0.55 mm and the active area is only0.63 mm 9 0.55 *** NH3sensing properties are obtained based on the sensors at room *** sensitivity is at most 28 when the sensors are exposed to NH3of 10 *** response time is 8 s or so and the recovery time is nearly 2 *** only fine selectivity,but also longtime stability is *** results not only demonstrate the obtained micro-sensors are very promising devices for NH3detection,but also show a possible route for large-scale NH3sensor fabrication at the industrial level.

关键词：微传感器恢复时间高灵敏度快速响应室温 NH3 SiO2 Si 器具

Coexistent vestibular schwannoma and meningioma in a patient without neurofibromatosis:A case report and review of literature

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World Journal of Clinical Cases 2021年第24期9卷 7251-7260页

作者： Li-Yan Zhao Yi-Ning Jiang Yu-Bo Wang Yang Bai Ying Sun Yun-Qian Li Department of Clinical Laboratory Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Department of Neurosurgery First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina

BACKGROUND The simultaneous occurrence of schwannoma and meningioma in the absence of neurofibromatosis(NF)or a previous history of irradiation is exceedingly rare,as only 10 intracranial cases have been reported to ***,we report a case of a coexistent cavernous sinus meningioma and ipsilateral vestibular schwannoma(VS)in a female patient without NF or a history of exposure to *** SUMMARY A 63-year-old woman presented with progressive left-side hearing loss and tinnitus over the previous *** the past 6 mo,she developed facial numbness and intermittent *** resonance imaging showed two lesions that were located on the left side of the cerebellopontine angle and parasellar *** lesions were totally resected via the left retrosigmoid *** examination revealed a VS and a *** patient did not have a family history or clinical or radiological signs of *** The coincident occurrence of VS and meningioma within close vicinity is very rare,and the pathogenesis is unclear.A careful whole-body examination needs to be conducted to exclude *** treatment with the goal of total tumor resection is the best *** studies are needed for a better understanding of the mechanisms that lead to the development of tumor growth in multiple locations.

关键词： Concurrent Diagnosis Meningioma Neurofibromatosis Schwannoma Case report