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Interval arithmetic operations for uncertainty analysis with correlated interval variables

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Acta Mechanica Sinica 2016年第4期32卷 743-752页

作者： Chao Jiang Chun-Ming fu Bing-Yu ni Xu Han State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University

A new interval arithmetic method is proposed to solve interval functions with correlated intervals through which the overestimation problem existing in interval analysis could be significantly alleviated. The correlation between interval parameters is defined by the multidimensional parallelepiped model which is convenient to describe the correlative and independent interval variables in a unified framework. The original interval variables with correlation are transformed into the standard space without correlation,and then the relationship between the original variables and the standard interval variables is obtained. The expressions of four basic interval arithmetic operations, namely addition, subtraction, multiplication, and division, are given in the standard space. Finally, several numerical examples and a two-step bar are used to demonstrate the effectiveness of the proposed method.

关键词： operations uncertainty arithmetic correlative unified transformed considering convenient subtraction illustrated

Anti-synchronization in Different Hyperchaotic Systems

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Communications in Theoretical Physics 2008年第10期50卷 907-912页

作者： DOU fu-quan SUN Jian-An DUAN Wen-Shan College of Physics and Electronics Engineering Northwest Normal University Lanzhou 730070 China

Based on active control theory, anti-synchronization between two different hyperchaotic systems is investigated. The sufficient conditions for achieving anti-synchronization of two different hyperchaotic systems are derived. Moreover, numerical simulations are presented for hyperehaotic Lorenz-Chen system, hyperchaotic Lorenz-Lu system, and hyperchaotic Chen Lu system to verify the effectiveness and feasibility of the proposed anti-synchronization scheme.

关键词： anti-synchronization hyperchaotic system active control

Damage and fracture model for eutectic composite ceramics

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Acta Mechanica Sinica 2019年第1期35卷 190-200,I0006页

作者： Jinfeng Yu Xinhua ni Xiequan Liu Yunwei fu Zhihong Du Department of Vehicle and Electric Engineering Army Engineering UniversityShijiazhuang 050003China Army Infantry College Nanchang 330000China Xichang Satellite Launch Center Xichang 615000China

Study of damage and fracture models to analyze the fracture mechanism of eutectic composite ceramics is of considerable importance because no accurate fracture models are available for these materials. Eutectic composite ceramics are composed of microcells with random direction. We present herein a model that predicts the damage and fracture of eutectic composite ceramics based on analysis of defect stability and the damage localization band. Firstly, given the microstructure of eutectic composite ceramics, a mesodomain and a microcell model are constructed. The local stress field in the mesodomain is then analyzed based on the interaction direct derivative estimate. Secondly, the stability of a defect around particles in a microcell is analyzed, and the stress intensity factor of an annular defect under the applied stress field and the residual stress field in the particle are calculated. The stress intensity factor of a defect is controlled by the residual stress when the defect extension is small. However, it is controlled by the applied stress when the defect extension is large. Finally, a model for the damage localization band at the crack tip is constructed based on the Dugdale-Barenblatt model. The residual intensity is the important factor affecting the length of the damage localization band. When the damage variables reach their largest value, the residual in ten sity and the length of the damage localization band attain their minimum value. This work provides the theoretical basis for further study of the damage mechanics of eutectic composite ceramics and guides the engineering applications of these materials.

关键词： Microcell Interaction direct derivative estimate Defect stability Damage localization band

Fast counting the cardinality of flows for big traffic over sliding windows

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Frontiers of Computer Science 2017年第1期11卷 119-129页

作者： Jingsong SHAN Yinjin fu Guiqiang ni Jianxin LUO Zhaofeng WU College of Command Information Systems PLA University of Science and Technology Nanjing 223002 China Huaiyin Institute of Technology Huaian 221002 China

Counting the cardinality of flows for massive high-speed traffic over sliding windows is still a challenging work under time and space constrains, but plays a key role in many network applications, such as traffic management and routing optimization in software defined network. In this pa- per, we propose a novel data structure （called LRU-Sketch） to address the problem. The significant contributions are as follows. 1） The proposed data structure adapts a well-known probabilistic sketch to sliding window model; 2） By using the least-recently used （LRU） replacement policy, we design a highly time-efficient algorithm for timely forgetting stale information, which takes constant （O（1）） time per time slot; 3） Moreover, a further memory-reducing schema is given at a cost of very little loss of accuracy; 4） Comprehensive ex- periments, performed on two real IP trace files, confirm that the proposed schema attains high accuracy and high time *** including IEEE TPDS, ACM ToS, JCST, MIDDLEWARE, CLUSTER, NAS, etc. Currently, his research interests include big data management, cloud storage, and distributed file systems.

关键词： probabilistic data structure sketch streaming data cardinality flow

THE TRANSIENT ELLIPTIC FLOW OF POWER-LAW FLUID IN FRACTAL POROUS MEDIA

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Applied Mathematics and Mechanics(English Edition) 2002年第8期23卷 875-880页

作者： SONG fu-quan(宋付权) LIU Ci-qun(刘慈群) Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 P R China Institute of Porous Flow and Fluid Mechanics Academia Sinica Langfang Hebei 065007 P R China

The steady oil production and pressure distribution formulae of vertically fractured well for power-law non-Newtonian fluid were derived on the basis of the elliptic flow model in fractal reservoirs. The corresponding transient flow in fractal reservoirs was studied by numerical differentiation method: the influence of fractal index to transient pressure of vertically fractured well was analyzed. Finally the approximate analytical solution of transient flow was given by average mass conservation law. The study shows that using elliptic flow method to analyze the flow of vertically fractured well is a simple method.

关键词： fractal media vertically fractured well transient flow power-law fluid

INVESTIGATION OF INFLUENCE OF WETTABILITY ON POISEUILLE FLOW VIA MOLECULAR DYNAMICS SIMULATION

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Journal of Hydrodynamics 2010年第4期22卷 513-517页

作者： SONG fu-quan WANG Jian-dong College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua 321004

In this article,the influence of wettability on a liquid flow between two parallel plane walls were studied by using Non-Equilibrium Molecular Dynamics（NEMD） *** wettability of the solid surfaces can be described as the contact *** liquid flow rate,the slip velocity and the slip length which are affected by the contact angle were *** results show that the boundary condition at a microscopic level is different from a ＂no-slip＂ condition at a macroscopic *** exits a slippage of a liquid flow for the hydrophobic boundary and an external force is needed to overcome threshold pressure for the hydrophilic *** the orderly layered distributions of the liquid particles near the hydrophilic surface vary from a place near the hydrophobic *** study indicates that the surface wettability plays a significant role on possibilities of forming a viscous layer and the direct slip at the solid *** resistance of liquid flow can be decreased by changing the wettability of boundary surface.

关键词： molecular dynamics simulation Poiseuille flow hydrophilic surface hydrophobic surface velocity slippage

Latest Middle Miocene fauna and flora from Kumkol Basin of northern Qinghai-Xizang Plateau and paleoenvironment

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Science China Earth Sciences 2020年第2期63卷 188-201页

作者： Qiang LI Xinying ZHOU Xijun ni Bihong fu Tao DENG Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China University of Chinese Academy of Sciences Beijing 100049China Institute of Remote Sensing and Digital Earth Chinese Academy of SciencesBeijing 100094China

We report 7 mammalian and 16 pollen species from the top of the Shimagou Formation in Kumkol Basin of northern Qinghai-Xizang Plateau, whose age is latest Middle Miocene(about 12.5 Ma). We erect a new species of fossil rodent,Spermophilinus kumkolensis sp. nov. The micromammalian fauna from the Kumkol Basin shares high similarities with contemporary faunas from Europe and northern China, indicating the existence of active zoogeographic exchange between Europe and northern Asia. Trees are dominant in pollen fossils, and herbs and shrubs are minorities. Broadleaved Quercus and Fagus predominate in tree pollens. The flora reconstructed by pollens displays a mixture of evergreen broadleaved forest and dry and warm steppe landscape. Compared to the modern vegetation in Yunnan region, the latest Middle Miocene flora in the Kumkol Basin represents a distinct vertical distribution. The ecotypes of the latest Middle Miocene fauna and flora in the Kumkol Basin,as a whole, are markedly different from those of modern animals and vegetation, the past climate being more suitable than today.

关键词： Qinghai-Xizang Plateau Kumkol Basin Latest Middle Miocene Micromammals Pollen

First-Principle Calculations for Elastic and Thermodynamic Properties of Diamond

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Communications in Theoretical Physics 2009年第6期51卷 1129-1134页

作者： fu Zhi-Jian JI Guang-fu CHEN Xiang-Rong GOU Qing-quan Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 621900 China International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

The elastic constants and thermodynamic properties of diamond are investigated by using the CRYSTALO3 program. The lattice parameters, the bulk modulus, the heat capacity, the Gruneieen parameter, and the Debye temperature are obtained. The results are in good agreement with the available experimental and theoretical data. Moreover, the relationship between V/V0 and pressure, the elastic constants under high pressure are successfully obtained. Especially, the elastic constants of diamond under high pressure are firstly obtained theoretically. At the same time, the variations of the thermal expansion α with pressure P and temperature Tare obtained systematically in the ranges of 0-870 GPa and 0-1600 K.

关键词： density functional theory elastic constants thermodynamic properties diamond

Inhibition of LncRNA Vof-16 expression promotes nerve regeneration and functional recovery after spinal cord injury

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Neural Regeneration Research 2022年第1期17卷 217-227页

作者： Xiao-Min Zhang Li-ni Zeng Wan-Yong Yang Lu Ding Kang-Zhen Chen Wen-Jin fu Si-quan Zeng Yin-Ru Liang Gan-Hai Chen Hong-fu Wu Key Laboratory of Stem Cell and Regenerative Tissue Engineering Guangdong Medical UniversityDongguanGuangdong ProvinceChina Biology Research Group Guangzheng Experimental SchoolHuizhouGuangdong ProvinceChina Geriatric Medicine Center Dongguan Waterfront Zone Central HospitalDongguanGuangdong ProvinceChina Scientific Research Center the Seventh Affiliated HospitalSun Yat-sen UniversityShenzhenGuangdong ProvinceChina Clinical Laboratory Affiliated Houjie HospitalGuangdong Medical UniversityDongguanGuangdong ProvinceChina Department of Intensive Care Unit Affiliated Houjie HospitalGuangdong Medical UniversityDongguanGuangdong ProvinceChina

Our previous RNA sequencing study showed that the long non-coding RNA ischemia-related factor Vof-16(lncRNA Vof-16)was upregulated after spinal cord injury,but its precise role in spinal cord injury remains *** predictions have indicated that lncRNA Vof-16 may participate in the pathophysiological processes of inflammation and ***12 cells were transfected with a pHBLV-U6-MCS-CMV-ZsGreen-PGK-PURO vector to express an lncRNA Vof-16 knockdown lentivirus and a pHLV-CMVIE-ZsGree-Puro vector to express an lncRNA Vof-16 overexpression *** overexpression of lncRNA Vof-16 inhibited PC12 cell survival,proliferation,migration,and neurite extension,whereas lncRNA Vof-16 knockdown lentiviral vector resulted in the opposite effects in PC12 *** blot assay results showed that the overexpression of lncRNA Vof-16 increased the protein expression levels of interleukin 6,tumor necrosis factor-α,and Caspase-3 and decreased Bcl-2 expression levels in PC12 ***,we established rat models of spinal cord injury using the complete transection at *** cord injury model rats were injected with the lncRNA Vof-16 knockdown or overexpression lentiviral vectors immediately after *** 7 days after spinal cord injury,rats treated with lncRNA Vof-16 knockdown displayed increased neuronal survival and enhanced axonal *** 8 weeks after spinal cord injury,rats treated with the lncRNA Vof-16 knockdown lentiviral vector displayed improved neurological function in the hind ***,lncRNA Vof-16 knockdown injection increased Bcl-2 expression and decreased tumor necrosis factor-αand Caspase-3 expression in treated *** treated with the lncRNA Vof-16 overexpression lentiviral vector displayed opposite *** findings suggested that lncRNA Vof-16 is associated with the regulation of inflammation and *** inhibition of lncRNA Vof-16 may be useful for promoting nerve regeneration and functional recovery a

关键词： apoptosis functional recovery inflammation long non-coding RNA ischemia related factor Vof-16 nerve regeneration nerve repair neurite extension neuronal survival proliferation spinal cord injury