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Differential Representations of SO(4) Dynamical Group

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Communications in Theoretical Physics 2008年第7期50卷 63-68页

作者： ZHAO Dun WANG shun-jin LUO Hong-Gang School of Mathematics and Statistics Lanzhou University Lanzhou 730000 China Department of Physics Sichuan University Chengdu 610064 China Center of Theoretical Physics and Interdisciplinary Studies Lanzhou University Lanzhou 730000 China Institute of Theoretical Physics Academia Sinica Beijing 100080 China

In this paper we present systematic differential representations for the dynamical group SO(4).Theserepresentations include the left and the right differential representations and the left and the right adjoint differentialrepresentations in both the group parameter space and its coset *** are the generalization of the differentialrepresentations of the SO(3) rotation group in the Euler *** representations may find their applications in thestudy of the physical systems with SO(4) dynamical symmetry.

关键词： dynamical group differential representation group action coset space

La_2Zr_2O_7 TBCs toughened by Pt particles prepared by cathode plasma electrolytic deposition

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International Journal of Minerals,Metallurgy and Materials 2016年第6期23卷 704-715页

作者： shun-jie Deng Peng Wang Ye-dong He jin Zhang Institute for Advanced Materials and Technology University of Science and Technology Beijing

La2Zr2O7 thermal barrier coatings（TBCs） with dispersed Pt particles were prepared by cathode plasma electrolytic deposition（CPED） with ceramic balls added to the cathode region. Compared with the conventional CPED, when ceramic balls are used in the cathode region, the plasma discharge ignition current density decreases approximately 62-fold and the stable plasma discharges occur at the whole cathode surface. Such TBCs with a thickness of 100 μm exhibit a crack-free surface and are composed of pyrochlore-structured La2Zr2O7. Cyclic oxidation, scratching, and thermal insulation capability tests show that such TBCs not only exhibit high resistance to oxidation and spallation but also provide good thermal insulation. These beneficial effects are attributed to the excellent properties of TBCs, such as good thermal insulation because of low thermal conductivity, high-temperature oxidation resistance because of low-oxygen diffusion rate, and good mechanical properties because of the toughening effect of Pt particles.

关键词： thermal barrier coatings platinum oxidation resistance toughening electrolytic deposition

Liver, biliary and pancreatic injuries in pancreaticobiliary maljunction model in cats

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Hepatobiliary & Pancreatic Diseases International 2015年第1期14卷 90-95页

作者： Feng Chen lin Tang Zhi-Qi Zhang Bing-Wei jin Wei-Feng Dong Jian Wang shun-Gen Huang Division of General Surgery Shanghai Jiaotong University Affiliated Sixth People's Hospital School of Basic Medical Sciences Nanjing University of Chinese Medicine Division of General Surgery Soochow University Affiliated Children's Hospital

BACKGROUND： Pancreaticobiliary maljunction is a high risk factor of pancreatitis and biliary tract cancer. How this maljunction affects the liver remains obscure. This study aimed to examine the effects of pancreaticobiliary maljunction on the liver, pancreas and gallbladder in a cat ***： A model of choledocho-pancreatic side-to-side ductal anastomosis was created in ten cats. Before the procedure,a small piece of tissue from the liver, pancreas and gallbladder was collected as a control. The common channel formation was checked by cholecystography. The livers, pancreases and gallbladders of these cats were harvested for histological examination. The expression of proliferating cell nuclear antigen in the gallbladder was examined with immunohistochemistry. RESULTS： Seven of the 10 cats survived for 6 months after surgery. The color of the liver was darker in the PBM model than the control specimen, with nodules on the surface. Histological examination showed ballooning changes and inflammatory infiltrations and the histopathological score increased significantly（P〈0.05）. Also, mitochondria swelling and lipid droplet in cytoplasm were observed under an electron microscope. The pancreas also appeared darker in the PBM model than the control specimen and dilated pancreatic ducts were found in three cats. Histopathological examination revealed vascular proliferation and inflammatory infiltration with numerous neutrophils. Gallbladder epithelial cells were featured by expanded endoplasmic reticulum, increased intercellular space and cellular nucleus deformation. The positive cells ofproliferating cell nuclear antigen were increased significantly（P〈0.05）. CONCLUSION： The present study demonstrated that pancreaticobiliary maljunction can lead to the injuries of the liver, pancreas and gallbladder.

关键词： pancreaticobiliary maljunction animal model ballooning change mitochondria swelling endoplasmic reticulum expanding

Porous a-Al_2O_3 thermal barrier coatings with dispersed Pt particles prepared by cathode plasma electrolytic deposition

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International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 92-101页

作者： Peng Wang Ye-dong He shun-jie Deng jin Zhang Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing

Porous α-Al2O3 thermal barrier coatings （TBCs） containing dispersed Pt particles were prepared by cathode plasma electrolytic deposition （CPED）. The influence of the Pt particles on the microstructure of the coatings and the CPED process were studied. The prepared coatings were mainly composed of α-Al2O3. The average thickness of the coatings was approximately 100 μm. Such single-layer TBCs ex- hibited not only excellent high-temperature cyclic oxidation and spallation resistance, but also good thermal insulation properties. Porous α-Al2O3 TBCs inhibit further oxidation of alloy substrates because of their extremely low oxygen diffusion rate, provide good thermal insu- lation because of their porous structure, and exhibit excellent mechanical properties because of the toughening effect of the Pt particles and because of stress relaxation induced by deformation of the porous structure.

关键词： porous material thermal barrier coatings alumina platinum electrolytic deposition oxidation

Index Computations in FJRW Theory

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Acta Mathematica Sinica,English Series 2014年第1期30卷 97-118页

作者： Ai jin lin School of Mathematical Sciences Peking University

We compute the index of the real Cauchy–Riemann operator defined in FJRW theory in case of the smooth *** the cylindrical metric,we study the relation between the index of the linearized operator of Witten map and we... 详细信息

关键词： Desingularization smooth metric index gluing index jumping

A Pull Back Theorem in the Adams Spectral Sequence

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Acta Mathematica Sinica,English Series 2008年第3期24卷 471-490页

作者： jin Kun lin School of Mathematical Science and LPMC Nankai University Tianjin 300071 P. R. China

This paper proves that, for any generator x∈ExtA^s,tq（Zp,Zp）, if （1L ∧i）＊Ф＊（x）∈ExtA^s＋1,tq＋2q（H＊L∧M, Zp） is a permanent cycle in the Adams spectral sequence （ASS）, then b0x ∈ExtA^s＋1,tq＋q（Zp, Zp） also is a permenent cycle in the ASS. As an application, the paper obtains that h0hnhm∈ExtA^3,pnq＋p^mq＋q（Zp, Zp） is a permanent cycle in the ASS and it converges to elements of order p in the stable homotopy groups of spheres πp^nq＋p^mq＋q-3S, where p ≥5 is a prime, s ≤ 4, n ≥m＋2≥4 and M is the Moore spectrum.

关键词： Adams spectral sequence Toda spectrum stable homotopy groups of spheres

INTERNAL SOLITARY WAVE IN TWO-LAYER FLUID SYSTEM TOWARDS SHELF

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Journal of Hydrodynamics 1991年第4期3卷 83-90页

作者： jin-lin, Zhu Tsinghua Univ Beijing China

The propagation of an interfacial solitary wave in a two-layer fluid system with fixed upper surface to shelf is discussed. The numerical results of the Boussinesq model show the fission of the solitary wave, the reflected waves by the slope and their dependence on the shelf height and slope. It is shown that the amplitude of the first transmitted solitary wave fully developed is esscentially independent of the bottom slope.

关键词： Hydrodynamics Water Waves Fluid Dynamics Water Waves Mathematical Models

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

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Journal of Energy Chemistry 2025年第01期 522-532页

作者： jin-Peng Wang Guo-Cui Mao Hui-lin Jiang Bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

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Tidal current turbine based on hydraulic transmission system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 511-518页

作者： Hong-wei LIU Wei LI Yong-gang lin shun MA State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

Tidal current turbines(TCTs) are newly developed electricity generating *** at the stabilization of the power output of TCTs,this paper introduces the hydraulic transmission technologies into *** hydrodynamics of the turbine was analyzed at first and its power output characteristics were predicted.A hydraulic power transmission system and a hydraulic pitch-controlled system were *** related simulations were ***,a TCT prototype was manufactured and tested in the *** test results have confirmed the correctness of the current design and availability of installation of the hydraulic system in TCTs.

关键词： Tidal current turbines(TCTs) Hydraulic power transmission Hydraulic pitch-controlled system Workshop test