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A No Shrinking Breather Theorem for Noncompact Harmonic Ricci Flows

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Acta Mathematica Sinica,English Series 2023年第10期39卷 1939-1950页

作者： jia rui CHEN Qun CHEN School of Mathematics and Statistics Wuhan UniversityWuhan 430072P.R.China

In this paper,we construct an ancient solution by using a given shrinking breather and prove a no shrinking breather theorem for noncompact harmonic Ricci flow under the condition that Sic:=Ric−α∇φ⊗∇φis bounded fro... 详细信息

关键词： Harmonic Ricci flow ancient solution breather

Low Cost 1D DCT Core for Multiple Video Codec

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Chinese Journal of Electronics 2016年第6期25卷 1052-1057页

作者： jia rui CHEN rui LIN Colin Yu GUO Zhenhong YANG Haigang Institute of Electronics Chinese Academy of Sciences The University of Chinese Academy of Sciences

The expandability of high demands for multimedia applications brings out more and more video standards for improving the coding and compression efficiency. As the most commonly used transform, Discrete cosine transform(DCT) achieves excellent energy compaction property and good compression efficiency. Hardware sharing is the mostly used efficient strategy to reduce the cost for video codec. Based on traditional matrix factorization, this paper makes three observations to direct the design of proposed hardware sharing architecture. The proposed architecture can be generally used to compute 8×8 DCT of AVS, H.264, VC-1 and HEVC in a low cost way, and can be used to decode Full-HD and WQXGA formate video sequences in real time. The design has been synthesized in 0.13μm technology. The synthesis results show that the proposed architecture achieves76.9% reduction in gate count, 85.6% decrease in power consumption and 35% improvement in operational speed in comparison with other existing designs.

关键词： Discrete cosine transform(DCT) 8×8 integer transform AVS H.264 VC-1 HEVC Hardware sharing

Network boundary recognition via relative azimuth angle

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The Journal of China Universities of Posts and Telecommunications 2010年第4期17卷 31-41页

作者： jia rui-wu SHI Geng-chen National Lab of Mechatronic Engineering and Control Beijing Institute of Technology Beijing 100081 China

To recognize the boundary of wireless networks to meet some specific needs, relative azimuth angles of nodes distributed in the 1-hop neighborhood of each node in one network were used to recognize the boundary of the network. A novel recognition algorithm based on local generalized convex hull was proposed for one node to decide if it self is a boundary node. The flexibility, efficiency and consistency of the algorithm are shown in its performance by extensive simulations.

关键词： wireless sensor network boundary point generalized convex hull relative azimuth angle θ-hull

An overview of the influence of atmospheric circulation on the climate in arid and semi-arid region of Central and East Asia

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Science China Earth Sciences 2018年第9期61卷 1183-1194页

作者： Yuzhi LIU Chuqiao WU rui jia jianping HUANG Key Laboratory for Semi-Arid Climate Change of the Ministry of Education College of Atmospheric Sciences Lanzhou University

The arid and semi-arid(ASA) region of Asia occupies a large area in the middle latitudes of the Northern Hemisphere, of which the main body is the ASA region of Central and East Asia(CEA). In this region, the climate is fragile and the environment is sensitive. The eastern part of the ASA region of CEA is located in the marginal zone of the East Asian monsoon and is jointly influenced by westerly circulation and the monsoon system, while in the western part of the ASA of CEA,the climate is mainly controlled by westerly circulation. To understand and predict the climate over this region, it is necessary to investigate the influence of general circulation on the climate system over the ASA region of CEA. In this paper, recent progress in understanding the relationship between the general circulation and climate change over the ASA region is systematically reviewed. Previous studies have demonstrated that atmospheric circulation represents a significant factor in climate change over the ASA region of CEA. In the years with a strong East Asian summer monsoon, the water vapor flux increases and precipitation is abundant in the southeastern part of Northwest China. The opposite situation occurs in years when the East Asian summer monsoon is weak. With the weakening of the East Asian summer monsoon, the climate tends to dry over the semi-arid region located in the monsoon marginal zone. Recently, owing to the strengthening of the South Asian monsoon, more water vapor has been transported to the ASA region of Asia. The Plateau summer monsoon intensity and the precipitation in summer exhibit a significant positive correlation in Central Asia but a negative correlation in North China and Mongolia. A significant positive correlation also exists between the westerly index and the temperature over the arid region of CEA. The change in the westerly circulation may be the main factor affecting precipitation over the arid region of Central Asia.

关键词： General circulation Monsoon Westerly Central and East Asia (CEA) Arid and semi-arid (ASA)

Hepatoprotective and antioxidant effects of dietary Glycyrrhiza polysaccharide against TCDD-induced hepatic injury and RT-PCR quantification of AHR2,ARNT2,CYPIA mRNA in jian Carp(Cyprinus carpio ***)

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Journal of Environmental Sciences 2017年第1期29卷 181-190页

作者： Jinliang Du Liping Cao rui jia Guojun Yin Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization Ministry of AgricultureFreshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi 214081China. International Joint Research Laboratory for Fish Immunopharmacology Freshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi 214081China Wuxi Fisheries College Nanjing Agricultural UniversityWuxi 214081China

To evaluate the protective effects of Glycyrrhiza polysaccharide（GPS） against 2,3,7,8-tetrachlorodibenzo-p-dioxin（TCDD）-induced hepatotoxicity in jian carp,the fish were fed diets containing GPS at doses of 0.1,0.5 and 1.0 g/kg for 60 days before an intraperitoneal injection of 0.6 μg/kg TCDD at a volume of 0.05 mL/10 g body *** 72 hr post-injection,blood and liver samples were taken for biochemical analysis and the fish liver samples were used for the preparation of pathological *** results showed that increases in alanine aminotransferase（GPT）,aspartate aminotransferase（GOT）,lactate dehydrogenase（LDH）,and alkaline phosphatase（AKP） in serum induced by TCDD were significantly inhibited by pre-treatment with 1.0 g/kg *** the 1.0 g/kg GPS pre-treatment,total protein（TP）,albumin（Alb）,catalase（CAT）,glutathione peroxidase（GPx）,total antioxidant capacity（T-AOC） and superoxide dismutase（SOD） activities in liver tissue increased significantly,malondialdehyde（MDA） formation（P ＆lt; 0.05 or P ＆lt; 0.01） was significantly inhibited,and the expression of cytochrome P4501A（CYP1A）,aryl hydrocarbon receptor 2（AHR2） and aryl hydrocarbon receptor nuclear translocator 2（ARNT2） mRNA（P ＆lt; 0.05） was significantly *** observations on fish liver were obtained by preparing paraffin tissue sections via HE staining,and the results showed that histological changes were obviously reduced by 0.5 and 1.0 g/kg *** significantly reduced liver tissue damage caused by ***,these results proved the hepatoprotective effect of GPS in protecting against fish liver injury induced by TCDD,and supported the use of GPS（1.0 g/kg） as a hepatoprotective and antioxidant agent in fish.

关键词： Aryl hydrocarbon receptor 2(AHR2) Aryl hydrocarbon receptor nuclear translocator 2(ARNT2) Cytochrome P4501A(CYP1A) Cyprinus carpio var.jian Glycyrrhiza polysaccharide 2 3 7 8-Tetrachlorodibenzo-p-dioxin(TCDD)

Pressure evolution in shock-compacted granular media

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Petroleum Science 2023年第6期20卷 3736-3751页

作者： jia-rui Li Jun-Sheng Zeng Kun Xue State Key Laboratory of Explosive Science and Technology Beijing Institute of TechnologyBeijing100081China Institute of Applied Physics and Computational Mathematics Beijing100094China

The pressure evolution associated with the transient shock-induced infiltration of gas flow through granular media consisting of mobile particles is numerically investigated using a coupled Eulerian–Lagrangian *** coupling between shock compaction and interstitial flow has been revealed.A distinctive two-stage diffusing pressure field with deflection occurring at the tail of the compaction front is found,with corresponding spikes in both gaseous velocity and temperature profiles emerging within the width of the compaction *** compaction front,together with the deflection pressure,reaches a steady state during the later *** analytical prediction of the steady deflection pressure that considers the contributions of porosity and the non-isothermal effect is *** isothermal single-phase method we developed,combining the porosity jump condition across the compaction front,shows consistent pressure evolution with the non-isothermal CMP-PIC one under weak shock strength and low column ***,the microscale mechanism governing the formation of not only pressure deflection but also gaseous velocity and temperature spikes within the width of the compaction front has been *** aforementioned evolutions of the flow field are shown to arise from the nozzling effects associated with the particle-scale variations in the volume fraction.

关键词： Shock compaction Pressure evolution Transport in porous media Transient gas infiltration Mobile granular column

Thermodynamic Properties of Spherically-Symmetric, Uniformly-Accelerated Reference Frames

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Communications in Theoretical Physics 2008年第4期49卷 928-932页

作者： HUANG Chao-Guang SUN jia-rui Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100049 China

We aim to study the thermodynamic properties of the spherically symmetric reference frames with uniform acceleration, including the spherically symmetric generalization of Rindler reference frame and the new kind of uniformly accelerated reference frame. We find that, unlike the general studies about the horizon thermodynamics, one cannot obtain the laws of thermodynamics for their horizons in the usual approaches, despite that one can formally define an area entropy （Bekenstein-Hawking entropy）. In fact, the common horizon for a set of uniformly accelerated observers does not always exist, even though the Hawking-Unruh temperature is still well-defined. This result indicates that the Hawking-Unruh temperature is only a kinematic effect, and to gain the laws of thermodynamics for the horizon, one needs the help of dynamics. Our result is in accordance with those from the various studies about the acoustic black holes.

关键词： uniformly accelerated reference frame Hawking-Unruh temperature entropy of horizon

Effect of near PT-symmetric potentials on nonlinear modes for higher-order generalized Ginzburg–Landau model

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Communications in Theoretical Physics 2022年第12期74卷 1-8页

作者： Da Lin Kai-Ru Dong jia-rui Zhang Yu-jia Shen College of Science China Agricultural UniversityBeijing 100083China

In this paper,we study the higher-order generalized Ginzburg–Landau model which contributes to describing the propagation of optical solitons in *** means of the Hirota bilinear method,the analytical solutions are obtained and the effect of relevant parameters is *** by the near parity-time-symmetric potentials,the nonlinear modes with 5%initial random noise are numerically simulated to possess stable ***,the evolution of nonlinear modes is displayed through the adiabatical change of some *** investigation of the present work is intended as a contribution to the work for the higher-order generalized Ginzburg–Landau model.

关键词： generalized Ginzburg–Landau model parity-time symmetry stability of soliton solutions

Numerical Simulation on Effects of Pressure Distribution of Wind Turbine Blade with a Tip Vane

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Journal of Thermal Science 2007年第3期16卷 203-207页

作者： WANG jian-Wen jia rui-Bo WU Ke-Qi School of Energy ＆ Power Engineering Huazhong University of Science ＆ Technology Wu Han 430074 School of Energy ＆ Power Engineering Inner Mongolia University of Technology Hohhot China 010051 School of Energy ＆ environment Engineering Inner Mongolia University of Science ＆ Technology Baotou 014010

It is important to study the pressure distribution on the blade and in the adjacent area while searching the power augmentation theory with adding a tip vane to the wind turbine. This paper shows the CFD simulation relationship of the pressure distribution on the rotor blade and in the adjacent area, after calculating the pressure of the different chordwise and spanwise point on the blade with the tip vane-V（8.8×8） and without the tip vane under tip speed ratio λ 4.5. Combining the isobaric section figure in certain location, it can be seen that the tip vane improve the pressure difference between pressure and suction surface. The most influenced zone is found and these can further display the power augmentation theory of the wind turbine using the tip vane. The simulation calculation was based on N-S equations. 3-D, steady, implicit solver was chosen. Turbulence model was k-ω SST. Discretization scheme is SECOND ORDER UPWIND. Pressure-velocity coupling was a typical SIMPLE scheme. In the whole grid system, two-divided grid formation was adopted, that is, inner region and outer region. Inner region including rectangular solid blade and neighboring, outer region is semi-cylinder. There were together 720,000 nodes with tetra-prism unstructured mesh.

关键词： Wind turbine tip vane pressure distribution numerical simulation