Search results

1

The Method of Jacobi Last Multiplier for Integrating Nonholonomic Systems

100%

Zhang Y.

Acta Physica Polonica A

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2011

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vol. 120

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issue 3

443-446

EN

In this paper, a new integral method of nonholonomic dynamical systems is put forward. The differential equations of motion of nonholonomic systems in phase space are established. The definition of the Jacobi last multiplier of the systems is given, and the relation between the Jacobi last multiplier and the first integrals of the systems is discussed. The researches show that the solution of the systems can be found by the last multiplier if the quantity of first integrals of the systems is sufficient. An example is given to illustrate the application of the results.

2

Caspase-1 inhibitor reduced the lung injury in a mouse model of pleuropneumonia caused by Actinobacillus pleuropneumoniae

54%

Zhang Y., Yang T., Huang F., Zhang Y., Yang T., Huang F.

Polish Journal of Veterinary Sciences

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2020

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vol. 23

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issue 4

3

HPM Generation by Tri-Anode Coaxial Vircator

54%

Shao H., Liu G., Zhang Y., Yang Z., Sun J., Zhang Y.

Acta Physica Polonica A

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2009

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vol. 115

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issue 6

1047-1049

EN

A novel type of coaxial vircator with 3 anodes is proposed. The advantages on high power microwave generation is tested by particle-in-cell simulation and theoretical analysis model is set up as well. The tri-anode coaxial vircator behaves a very stable frequency in the pulse duration. In the tri-anode coaxial vircator, the injecting electron beam is well premodulated in the first anode cavity and forms an inerratic bunch-dispersion mechanism in the second anode cavity; the energy-loss electrons penetrate through the third anode and absorbed by the dumping cavity locates in the centre electrode, which helps keeping the bunch-dispersion cycle undisturbed. A 3.8 GHz tri-anode coaxial vircator is theoretically designed and optimized by particle-in-cell simulation, which gives beam-wave conversion efficiency of over 20% with a stable predominant frequency, in accordance with the particle-in-cell simulation and analytic model.

4

Magnetic Properties of Oxygen Deficient Y_{0.33}Sr_{0.67}CoO_{3-δ}

51%

Zhang Y., Sasaki S., Yanagisawa O., Izumi M.

Acta Physica Polonica A

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2007

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vol. 111

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issue 1

79-86

EN

We studied magnetic properties of perovskite-type Y_{0.33}Sr_{0.67} CoO_{2.614} and Y_{0.33}Sr_{0.67}CoO_{2.707} prepared under different sintered temperatures at 1250ºC and 1100ºC, respectively. A dc magnetization jump associated with a large thermal hysteresis around 180 K was found in Y_{0.33}Sr_{0.67}CoO_{2.614}, which indicates a kind of magnetic memory effect. On the other hand, Y_{0.33}Sr_{0.67}CoO_{2.707} shows a larger magnetization with a small magnetization jump around 200 K and lower Curie temperature than those of Y_{0.33}Sr_{0.67}CoO_{2.614}. Rich Co^{3+} ions in the low temperature sintered Y_{0.33}Sr_{0.67}CoO_{2.707} possibly introduce large magnetization and high magnetization jump temperature. This may be coming from a surface/volume effect of Co^{3+} ions appearing in the polycrystalline sample prepared at low temperature. The ferromagnetism resulted from the different surface/volume ratio contributes to a part of magnetization and may result in the change of the Curie temperature.

5

Deconstructing B cell tolerance to basement membranes

51%

Foster M. H., Zhang Y., Clark A. G.

Archivum Immunologiae et Therapiae Experimentalis

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2006

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vol. 54

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issue 4

227-237

EN

Basement membrane antigens are frequent targets of autoantibody attack in systemic and organ-restricted autoimmunity. These specialized and highly organized matrices are composed of multiple components with restricted tissue distributions and limited epitope exposure. To the dissect mechanisms controlling humoral autoimmunity to nephritogenic basement membrane antigens, we developed autoantibody transgenic models. In mice bearing the LamH Ig transgene encoding B cell receptors specific for laminin, autoreactive B cells are readily generated but actively regulated in vivo. In this model, anti-laminin B cells are immunologically censored by mechanisms that include central deletion, k light-chain editing, and anergy. Tolerance is maintained when the transgene is established in MRL and BXSB genetic backgrounds with inherited autoimmune susceptibility, and despite provocation with potent environmental stimulants. Collectively, these studies indicate that the pathogenic anti-laminin reactivity characteristic of systemic lupus is tightly regulated. A novel anti-collagen transgenic model is used to assess the tolerogenesis of a structurally distinct pathogenic basement membrane epitope and to determine if the reactivity to putative cryptic epitopes targeted in organ-restricted disease is regulated. These studies should provide insight into the molecular mechanisms controlling basement membrane autoreactivity and ultimately facilitate the development of novel strategies to inactivate autoreactive cells and treat autoimmune disease.

6

Study of Complex Cathode Emission Characters

51%

Zhang Y., Song F., Xiang F.

Acta Physica Polonica A

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2009

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vol. 115

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issue 6

1194-1196

EN

Based on the study of explosive emission, the dielectric enhanced electric-field emission model is brought forward, and the metal-dielectric complex cathode material is manufactured. Based on the investigation of surface-flashover explosive emission, the graphite-carbon fiber complex cathode is manufactured, too. Then the experiments are developed respectively, and the results show the electron emission density of these two complex cathode materials is also more than 17 kA/cm^{2}, and their lifetime is exceeding 10^{5} pulses.

7

Mechanical Properties and Fracture Analysis of Clinched Joints in Titanium Sheet Materials

51%

He X., Lei L., Zhang Y., Xing B.

Acta Physica Polonica A

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2017

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vol. 131

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issue 1

16-19

EN

Mechanical fastening techniques are used extensively in different industry fields for joining various materials in the assembly of components and structures. The use of mechanical clinching is of interest to different industries such as aerospace, automotive, packaging and domestic appliance. This, together with increasing use of light-weight materials, has produced a significant increase in the use of mechanical clinching in light-weight structures in recent years. This paper deals with the mechanical properties and fracture analysis of extensible die clinched joints in the dissimilar metal sheets combinations of titanium sheet material and aluminum sheet material. Tensile-shear tests were carried out to characterize the mechanical properties of different clinched joints made of the dissimilar metal sheets combinations. The normal hypothesis tests were performed to examine the rationality of the test data. The load-bearing capacity and failure modes of different titanium sheets clinched joints were studied. Results showed that most titanium sheets clinched joints failed in the neck fracture mode. Results also showed that the load-bearing capacity of clinch joints with titanium as upper sheets is higher than that of the clinched joints with titanium as lower sheets.

8

Effect of Granule Shape on the Giant Magnetoresistance for Ferromagnetic Metal-Metal Granular Films

51%

Wang C., Zhang P., Zhang Y., Rong Y.

Acta Physica Polonica A

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2007

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vol. 112

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issue 6

1231-1238

EN

In order to investigate the effect of granule shape on the giant magnetoresistance, assuming that granular films consist of ellipsoidal ferromagnetic granules embedded in a nonmagnetic metal matrix and the ellipsoidal granules have different demagnetizing factors in three directions, we combined two-current model with the effective medium theory to investigate the effect of granule shape on the giant magnetoresistance. The results revealed that the giant magnetoresistance in granular films depended strongly on the granule shape and was between those for current perpendicular to the plane of the layers and current in the plane of the layers in magnetic multilayers.

9

Experimental and numerical study of the uniaxial compressive stress-strain relationship of a rock mass with two parallel joints

46%

Xiong L. X., Yuan H. Y., Zhang Y., Zhang K. F., Li J. B., Xiong L. X., Yuan H. Y., Zhang Y., Zhang K. F., Li J. B.

Archives of Civil Engineering

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2019

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vol. 65

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issue 2

10

Influence of the number of turns on the performance of permanent magnet synchronous motor

46%

Qiu H., Zhang Y., Yang C., Yi R., Qiu H., Zhang Y., Yang C., Yi R.

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2020

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issue 3

11

Microstructure and Magnetic Properties of Magnetron-Sputtered [Fe/Pt]ₙ Multilayer Films

45%

Zhang Y., Yu W., Chen F., Liu M., Li H.

Acta Physica Polonica A

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2015

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vol. 128

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issue 3

326-330

EN

[Fe/Pt]ₙ multilayer films were prepared on thermally oxidized Si (100) substrates at 300°C using dc magnetron sputtering and annealed for different temperature ranging from 350 to 500°C. It is found that the as-deposited [Fe/Pt]ₙ multilayer films exhibit well-resolved periodic structures and low roughness of interface. The ordering degree of the annealed films decreases and their perpendicular magnetic anisotropy deteriorates with increasing the period number. Fe/Pt bilayer film annealed at 350°C shows (001) orientation and hard magnetic characteristic, the coercivity and perpendicular anisotropy enhance with increase of annealing temperature. In addition, the hard and soft magnetic phases are not fully magnetically coupled in the Fe/Pt film annealed at higher temperature.

12

The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies

45%

Zhang P., Zhang Y., Han S., Yan Q., Li J.

Acta Physica Polonica A

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2006

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vol. 109

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issue 3

399-404

EN

The vibrational dynamics of water around glycine was investigated by using Raman spectroscopy and inelastic neutron scattering. Experiments of deuterated glycine versus deuterium were performed as comparison. The study shows that for glycine, the exchange of proton-deuteron on the active NH_3^+ side was easy, whereas there was hardly exchange on the CH_2 side. Comparing different proportion of glycine vs. water molecules we obtained that the presence of water hardly changes the main features of glycine illustrating its hydrophobic character. The intralayer hydrogen bonds of glycine crystal are difficult to be replaced due to its stronger bond than water.

13

The Ground State Structures and Magnetic Properties of ZrₙNi (n=1-9) Clusters from First Principles Calculation

45%

Zhang Y., Zhu Z., Zhou X., Yang J., Zhu Y.

Acta Physica Polonica A

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2017

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vol. 131

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issue 6

1507-1511

EN

The ground state structures and magnetic properties of ZrₙNi (n = 1-9) clusters are studied by using first principles calculation. Firstly, we find the ground state configurations of ZrₙNi (n = 1-9) clusters. Secondly, the magic clusters (Zr₂Ni and Zr₇Ni) of ZrₙNi clusters are found by the comparisons of average binding energies, the second-order energy difference and energy gaps between the highest occupied orbital and the lowest unoccupied orbital of the ground state of ZrₙNi clusters. Thirdly, the calculated results show that magnetic moment of ZrₙNi (n = 1-2) clusters is 4 μ_{B}; however, the magnetic moment of ZrₙNi clusters is about 2 μ_{B} for n = 3-9 (exception for n = 7). Finally, it is found that the magnetic moment of ZrₙNi cluster mainly comes from Zr atom and Ni atom is the electron acceptor from the Mulliken population analysis.

14

Y Addition Effects on Hot Deformation Behavior of Cu-Zr Alloys with High Zr Content

39%

Tian K., Tian B., Volinsky A. A., Zhang Y., Liu Y., Du Y.

Archives of Metallurgy and Materials

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2018

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vol. 63

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issue 2

15

Ab Initio Study of He Migrations in Fcc Au-Ag Alloys

39%

Zhu Z., Zhang Y., Xie J., Yang L., Nie J., Zu X.

Acta Physica Polonica A

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2016

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vol. 129

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issue 6

1151-1154

EN

Ab initio calculations based on the density functional theory have been performed to investigate the migrations of interstitial helium (He) atoms in Au-Ag alloys with two different mass ratios (Au₃Ag₂ and AuAg). The results show that the migration mechanisms of He atoms mainly depend on the crystal structures of alloys, and their migration energy barriers are affected by the migration paths in Au-Ag alloys. He interstitials preferentially occupied the most stable sites, but it is difficult for He interstitials to migrate to nearest most stable sites via second stable positions at room temperature. When He atom is at the tetrahedral position which has higher formation energy, it possibly migrates to nearest tetrahedral positions directly for AuAg alloy. In addition, comparing the migration of He defects in the two alloys, we found that the properties of migration energy and relative stability of He atoms probably slightly depend on the mass-density of Au-Ag alloys.

16

Optical and Scintillation Properties of Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12} Single Crystal

33%

Xiao X., Xu J., Lu B., Cai W., Zhang Y., Shen H., Yang B., Xiang W.

Acta Physica Polonica A

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2015

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vol. 127

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issue 3

854-858

EN

The solid solution crystals, Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12} (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to ^{137}Cs γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.

17

iTRAQ-based quantitative proteomics analysis reveals inhibitory mechanismsof the antimicrobial peptide MDAP-2 against Salmonella gallinarum

33%

Zhang Y., Yu S., Ying X., Jia B., Liu L., Liu J., Kong L., Pei Z., Ma H., Zhang Y., Yu S., Ying X., Jia B., Liu L., Liu J., Kong L., Pei Z., Ma H.

Polish Journal of Veterinary Sciences

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2020

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vol. 23

|

issue 3

Refine search results

The Method of Jacobi Last Multiplier for Integrating Nonholonomic Systems

Caspase-1 inhibitor reduced the lung injury in a mouse model of pleuropneumonia caused by Actinobacillus pleuropneumoniae

HPM Generation by Tri-Anode Coaxial Vircator

Magnetic Properties of Oxygen Deficient Y_{0.33}Sr_{0.67}CoO_{3-δ}

Deconstructing B cell tolerance to basement membranes

Study of Complex Cathode Emission Characters

Mechanical Properties and Fracture Analysis of Clinched Joints in Titanium Sheet Materials

Effect of Granule Shape on the Giant Magnetoresistance for Ferromagnetic Metal-Metal Granular Films

Experimental and numerical study of the uniaxial compressive stress-strain relationship of a rock mass with two parallel joints

Influence of the number of turns on the performance of permanent magnet synchronous motor

Microstructure and Magnetic Properties of Magnetron-Sputtered [Fe/Pt]ₙ Multilayer Films

The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies

The Ground State Structures and Magnetic Properties of ZrₙNi (n=1-9) Clusters from First Principles Calculation

Y Addition Effects on Hot Deformation Behavior of Cu-Zr Alloys with High Zr Content

Ab Initio Study of He Migrations in Fcc Au-Ag Alloys

Optical and Scintillation Properties of Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12} Single Crystal

iTRAQ-based quantitative proteomics analysis reveals inhibitory mechanismsof the antimicrobial peptide MDAP-2 against Salmonella gallinarum