Wyniki wyszukiwania dla: L.J. Zhang

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artykuł

Analysis on the local structures for 3d¹ impurities (Ti³⁺ and V⁴⁺) in KTiPO₄

C.C. Ding, S.Y. Wu, L.J. Zhang, Y.Q. Xu, więcej

Magnetic Resonance in Chemistry > 56 > 1 > 25 - 31

Making use of the perturbation formulae for 3d¹ ions (Ti³⁺ and V⁴⁺) under orthorhombically compressed octahedra, the spin Hamiltonian parameters (g factors: g_x, g_y, g_z and hyperfine structure constants: A_x, A_y, A_z) and local structures of the 3d¹ impurity centres C₁, C₂, and C₃ in KTiOPO₄ crystals are theoretically analyzed in a consistent way. The remarkable local distortions (i.e., the relative...

artykuł

Microstructure and mechanical behaviors of GdxCoCrCuFeNi high-entropy alloys

L.J. Zhang, P.F. Yu, M.D. Zhang, D.J. Liu, więcej

Materials Science and Engineering: A > 2017 > 707 > C > 708-716

A new series of Gd_xCoCrCuFeNi (x = 0, 0.05, 0.1, 0.2, and 0.3) high entropy alloys were synthesized to investigate alloying effects of the rare-earth element, Gd, on the microstructure and mechanical behaviors. Microstructures of these alloys were examined using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, and the phase evolution was characterized and compared...

artykuł

Stress-induced mechanical heterogeneity in metallic glasses revealed by spatial nano-indentation

P. Cui, J.T. Fan, L.J. Zhang, P.F. Yu, więcej

Journal of Non-Crystalline Solids > 2017 > 471 > C > 91-94

The heterogeneity plays a key role in physical and mechanical properties of a material. The nature of lacking long-range order in metallic glasses (MGs) causes the local atomic rearrangement to vary significantly in space when compressed. Different configurations of an ensemble of atoms in a MG lead, therefore, to a distribution of nanohardness, which also changes in space. The effects of pressure...

artykuł

DEM study of blockage behaviour of cohesive fine particles in a packed structure of large particles

Z.G. Luo, H. Zhou, T. Zhang, Y. You, więcej

Powder Technology > 2017 > 314 > C > 102-109

Blockage of cohesive fine particles in a packed structure of large particles may happen in many industrial processes, of particular interests to ironmaking COREX technology. In this work, blockage behaviour of cohesive fine particles in a simplified packing structure is studied by means of discrete element method. The typical phenomena about effects of sticking force on descending velocity and blockage...

artykuł

Pressure-induced phase transitions in HoDyYGdTb high-entropy alloy

P.F. Yu, L.J. Zhang, J.L. Ning, M.Z. Ma, więcej

Materials Letters > 2017 > 196 > C > 137-140

The HoDyYGdTb high-entropy alloy (HEA) was synthesized and its structural phase transitions were determined under compression up to 60.1GPa at room temperature. Three transformations following the sequence hexagonal close-packed (hcp)→samarium type (Sm-type)→double hexagonal close-packed (dhcp)→distorted face-center cubic (dfcc) are observed at 4.4, 26.7, and 40.2GPa, respectively. The high pressure...

artykuł

Tuned mass damper system of high-rise intake towers optimized by improved harmony search algorithm

H.Y. Zhang, L.J. Zhang

Engineering Structures > 2017 > 138 > C > 270-282

The seismic safety and proper functioning of intake towers in a major earthquake are very crucial to the whole hydraulic project, since the controlled release of the reservoir could help to prevent catastrophic failure of a dam after an earthquake by reducing the water pressure. In this study, the tuned mass damper (TMD) system was introduced into the seismic design of high-rise intake towers. The...

artykuł

Magnetic BiMn-α phase synthesis prediction: First-principles calculation, thermodynamic modeling and nonequilibrium chemical partitioning

S.H. Zhou, C. Liu, Y.X. Yao, Y. Du, więcej

Computational Materials Science > 2016 > 120 > C > 117-126

BiMn-α is promising permanent magnet. Due to its peritectic formation feature, there is a synthetic challenge to produce single BiMn-α phase. The objective of this study is to assess driving force for crystalline phase pathways under far-from-equilibrium conditions. First-principles calculations with Hubbard U correction are performed to provide a robust description of the thermodynamic behavior....

książka

Web Services

Liang-Jie (LJ) Zhang, Mario Jeckle

Lecture Notes in Computer Science

Welcometotheproceedingsofthe2004EuropeanConferenceonWebServices(ECOWS 2004).ECOWSisoneoftheleadinginternationalconferencesfocusingonWebservices. ECOWS2004wasaforumforresearchersandpractitionersfromacademiaandindustry to exchange information regarding advances in the state of the art and practice of Web services, identify emerging research topics, and de?ne the future directions of Web services computing...

artykuł

Nanotwin's formation and growth in an AlCoCuFeNi high-entropy alloy

P.F. Yu, H. Cheng, L.J. Zhang, H. Zhang, więcej

Scripta Materialia > 2016 > 114 > C > 31-34

Nanotwins were formed in the AlCoCuFeNi high-entropy alloy produced by melt-spinning. The Cu-rich nanotwins have a face-centered-cubic (FCC) structure diffused in the ordered body-centered-cubic (B2) matrix. The nanotwins decompose from the matrix with the K–S crystallographic relationship: {111}_FCC∥{110}_B2 and <110>_FCC∥<111>_B2. After annealing, the spherical nanotwins grow into rodlike...

artykuł

The high-entropy alloys with high hardness and soft magnetic property prepared by mechanical alloying and high-pressure sintering

P.F. Yu, L.J. Zhang, H. Cheng, H. Zhang, więcej

Intermetallics > 2016 > 70 > C > 82-87

The equiatomic multiprincipal CoCrFeCuNi and CoCrFeMnNi high-entropy alloys (HEAs) were consolidated via high pressure sintering (HPS) from the powders prepared by the mechanical alloying method (MA). The structures of the MA'ed CoCrFeCuNi and CoCrFeMnNi powders consisted of a face-centered-cubic (FCC) phase and a minority body-centered cubic (BCC) phase. After being consolidated by HPS at 5 GPa,...

artykuł

Effects of high pressure torsion on microstructures and properties of an Al0.1CoCrFeNi high-entropy alloy

P.F. Yu, H. Cheng, L.J. Zhang, H. Zhang, więcej

Materials Science and Engineering: A > 2016 > 655 > C > 283-291

High pressure torsion (HPT) under a pressure of 6GPa through 1 and 2 revolutions have been used to follow the evolution of microstructures and properties in an Al_0.1CoCrFeNi high-entropy alloy (HEA). The plastic-deformation mechanisms of the HEA include dislocation slip at low strains and twinning at high strains at room temperature. The planar dislocation slip on the normal face-centered-cubic slip...

artykuł

Guest Editorial: Recommendation Techniques for Services Computing and Cloud Computing

Michael R. Lyu, Liang-Jie LJ Zhang

IEEE Transactions on Services Computing > 2015 > 8 > 3 > 422 - 424

As the number of Web services surges rapidly, recommending the right service for various users on demand has become one of the most challenging research issues in the fields of services computing and cloud computing. This special issue focuses on the recommendation techniques for services computing and cloud computing including classic recommendation algorithms for services computing and cloud computing,...

artykuł

Emerging Web Services

Bhavani Thuraisingham, Lang-Jie LJ Zhang, Louise Moser

IEEE Transactions on Services Computing > 2015 > 8 > 3 > 341 - 342

artykuł

Numerical simulation of full penetration laser welding of thick steel plate with high power high brightness laser

L.J. Zhang, J.X. Zhang, A. Gumenyuk, M. Rethmeier, więcej

Journal of Materials Processing Tech. > 2014 > 214 > 8 > 1710-1720

Full penetration laser welding was carried out on a 10mm steel plate using a 16kW maximum power continuous wave thin disk laser. Upper surface and lower surface of molten pool were observed synchronously with two high speed CCD cameras during the welding process. The lower surface was much longer and more unstable than the upper one. A three dimensional laser deep penetration welding model in which...

artykuł

Evaluation of the combined toxicity of multi-walled carbon nanotubes and sodium pentachlorophenate on the earthworm Eisenia fetida using avoidance bioassay and comet assay

C.W. Hu, L.J. Zhang, W.L. Wang, Y.B. Cui, więcej

Soil Biology and Biochemistry > 2014 > 70 > Complete > 123-130

In this study, the adsorption kinetics of sodium pentachlorophenate (PCP-Na) onto multi-walled carbon nanotubes (MWCNTs) was determined and acute toxicity tests were performed to evaluate the toxicity of MWCNTs and PCP-Na on the earthworm Eisenia fetida in artificial soil samples, and then the toxicities of their mixture were investigated using soil avoidance test and comet assay. The results of the...

artykuł

An evaluation of atmospheric Nr pollution and deposition in North China after the Beijing Olympics

X.S. Luo, P. Liu, A.H. Tang, J.Y. Liu, więcej

Atmospheric Environment > 2013 > 74 > Complete > 209-216

North China is known for its large population densities and rapid development of industry and agriculture. Air quality around Beijing improved substantially during the 2008 Summer Olympics. We measured atmospheric concentrations of various N _r compounds at three urban sites and three rural sites in North China from 2010 to 2012 and estimated N dry and wet deposition by inferential models and...

artykuł

One-pot domino reactions for synthesis of heterocyclic[3.3.3]propellanes and spiro[cyclopenta[b]pyridine-4,2'-indenes]

L.J. Zhang, C.G. Yan

Tetrahedron > 2013 > 69 > 24 > 4915-4921

An efficient synthetic procedure for the functionalized heterocyclic[3.3.3]propellanes was successfully developed by one-pot domino reaction of ninhydrin, malononitrile with 3-arylamino-2-cyclohexenones and their 5,5-dimethyl derivatives in the presence of triethylamine in ethanol at room temperature. On the other hand the similar one-pot reaction containing 3-arylamino-2-cyclopentenones resulted...

artykuł

Fabrication and properties of Bi ₂ S ₃ _- _x Se _x thermoelectric polycrystals

L.J. Zhang, B.P. Zhang, Z.H. Ge, C.G. Han

Solid State Communications > 2013 > 162 > Complete > 48-52

Bi ₂ S ₃ _- _x Se _x (x=0-0.3) polycrystals were fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). The phase, microstructure, electrical and thermal transport properties were investigated with a special emphasis on the influence of Se content. All the samples were indexed as single phase with an orthorhombic symmetry. Optimizing the Se content greatly...

artykuł

Effect and mechanism of ion bombardment on coercive force of NdFeB magnet

J.L. Li, L.J. Zhang, Y.X. Wang, L.P. Wang, więcej

Materials Letters > 2013 > 98 > Complete > 102-104

Ion bombardment can apparently affect the coercive force of the NdFeB magnet. Compared with the dosage, the bombardment voltage has more obvious effect in change the coercive force of a magnet. When the voltage of ion is 1kV, the coercive force increases by 15% compared to untreated one. However, at a higher voltage of 50kV, ion bombardment induces a decrease of the coercive force by 18%. It is suggested...

artykuł

Computational study of atomic mobilities in Al–Zr solid solutions and the growth of ZrAl3 intermetallic phase

H. Bo, D.D. Liu, L.B. Liu, L.J. Zhang, więcej

Calphad > 2013 > 40 > C > 34-40

Based on the thermodynamic description, experimental diffusion coefficients and empirical relations, the atomic mobilities of Al and Zr in fcc_Al, bcc_Zr and hcp_Zr phases have been optimized. From the comparisons between the calculated and measured diffusion coefficients, it can be seen that most of the experimental data are reproduced well. A good prediction was also made in the composition–distance...

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