Haifeng Li

Huaqiao University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Quantum Markovian master equation for scattering from surfaces

The Journal of Chemical Physics (2014)

Haifeng Li Jiushu Shao Asaf Azuri Eli Pollak Robert Alicki

We propose a semi-phenomenological Markovian Master equation for describing the quantum dynamics of atom-surface scattering. It embodies the Lindblad-like structure and can describe both damping and pumping of energy between the system and the bath. It preserves positivity and correctly accounts for the vanishing of the interaction of the particle with the surface when the particle is distant from the surface. As a numerical test, we apply it to a model of an Ar atom scattered from a LiF surface, allowing for interaction only in the vertical direction. At low temperatures, we find that the quantum mechanical average energy loss is smaller than the classical energy loss. The numerical results obtained from the space dependent friction master equation are compared with numerical simulations for a discretized bath, using the multi-configurational time dependent Hartree methodology. The agreement between the two simulations is quantitative.

Lindblad equation

10.1063/1.4851075

Cite

Citations (3)

Experimental and Numerical Investigation of Free Surface Vortex

Journal of Hydrodynamics (2008)

Haifeng Li Hongxun Chen Zheng Ma Yi Zhou

Burgers vortex

Starting vortex

Vortex stretching

Free surface

Entrainment (biomusicology)

Vortex Tube

10.1016/s1001-6058(08)60084-0

Cite

Citations (94)

Analysis of prenatal screening results on G6PD deficiency examination among 3690 persons of childbearing age

Journal of Qiqihar University of Medicine (2013)

Haifeng Li

Objective To find out the glucose-6-phosphate dehydrogenase(G6PD) deficiency incidence in Wuzhou.Methods Blood samples from 3,690 persons of childbearing age were examined on G6PD activity and hemoglobin content with UV rate method and sodium dodecyl sulfate colorimetric method,and then calculated the G6PD activity per gram of hemoglobin.The one whose value was lower than the reference was diagnosed as G6PD deficiency.Results There were 243 patients whose G6PD activity were abnormal and incidence of G6PD deficiency was 6.59%.What's more,the male subject with G6PD deficiency rate was 12.16%,while female was 2.89%.The differences between male and female were very significant(χ2=123.73,P0.01).Conclusions There is a higher incidence of G6PD deficiency in Wuzhou.It is very important to detect G6PD activity among people of childbearing age for healthy child rearing and the improvement of the population quality.

Source

Cite

Citations (0)

Stability assessment and feature analysis of slope in Nanfen Open Pit Iron Mine

International Journal of Mining Science and Technology (2012)

Jun Yang Zhigang Tao Baoliang Li Yang Gui Haifeng Li

Open Pit Mining

Safety factor

10.1016/j.ijmst.2012.04.008

Cite

Citations (26)

EVALUATION ON EXTENT CHANGE AND FUTURE DEVELOPMENT OF URBAN LAND USE USING GIS TECHNOLOGY

Lowland Technology International (2012)

Dongjie Guan Xueru Zhang Haifeng Li Takuro Inohae Tadashi Nagaie

Based on four phases of land use patterns obtained in 1976, 1987, 1997 and 2005 with integrating spatial technology of geographic information system(GIS), this paper studied the dynamic change and transformation of various land use types in Fukuoka, Japan. Firstly, the characteristics of quantitative and spatial change of land use in the past 29 years were described according to spatial distribution maps, and then changing of land use extent was evaluated by a dynamic change model. The results indicate that the grade value of land use extent was situated between 2 and 4, showing that the land use extent has been transferring from extensive type to urban use type; additionally, change amount and change rate of land use extent were both greater than 0, thus, the land use extent has been situated at a developing stage. Finally, a transfer matrix of Markov was applied to analyze the transferring process of each land use type and to forecast the tendency of future land use change. The forecasting results reveal that area of urban land will continually keep rising at a gradually decreasing speed. Therefore, it will be a long process for land use extent to reach to the urbanization level.

Spatial change

Source

Cite

Citations (0)

Research on the Effect of Explosive Material Parameters on Its Crack Expand

Initiators & Pyrotechnics (2006)

Haifeng Li

There exists essential difference between the brittle material and the plastic material about mechanics characteristic. According to the dynamics characteristics of the brittle material, the equation between the brittle material parameters and the crack length crack expand velocity is deduced, and the effects of brittle material parameters on crack expand velocity under the shock wave is discussed in this paper emphatically. The dynamic fracture criterion under shock wave is also put forward. All of above can be applied in many brittle materials engineering such as concrete, rock, etc.

Brittleness

Brittle fracture

Source

Cite

Citations (0)

Investigation on Luminescence Properties of a Long Afterglow Phosphor Ca₂SnO₄:Tm³⁺

Chemistry - An Asian Journal (2015)

Haifeng Li Wenzhi Sun Yonglei Jia Tengfei Ma Jipeng Fu

A series of new long afterglow phosphors Ca2 SnO4:xTm(3+) were synthesized by using traditional solid-state reactions. XRD measurements and Rietveld refinement revealed that the incorporation of the Tm(3+) dopants generated no second phase other than the original one of Ca2 SnO4, which indicated that the dopants completely merged into the host. The corresponding optical properties were further systematically studied by photoluminescence, phosphorescence, and thermoluminescence (TL) spectroscopy. The results show that the Tm(3+)-related defects account for the bright bluish green afterglow emission from the characteristic f-f transitions of Tm(3+) ions. The bluish green long-lasting phosphorescence could be observed for 5 h by the naked eye in a dark environment after the end of UV irradiation. Two TL peaks at 325 and 349 K from the TL curves were adopted to calculate the depth of the traps, which were 0.45 and 0.78 eV, respectively. The mechanism of the long afterglow emission was also explored.

Persistent luminescence

10.1002/asia.201500580

Cite

Citations (14)

Multiplications and eigenvalues of tensors via linear maps

Linear and Multilinear Algebra (2018)

Zhaobing Fan Chunli Deng Haifeng Li Changjiang Bu

In this paper, we study multiplications and eigenvalues of tensors by using linear maps. By the composition of linear maps, we naturally obtain two multiplications of tensors, which generalize Shao's product, Einstein product and n-mode product etc. Some properties of product of tensors are obtained directly, which don't need proofs, for example the associative law of Shao's product etc. Moreover, we extend eigenvalues of tensors to tensor representations of quivers. By using tensor representations of quivers, eigenvalues of tensors and properties are given.

Invariants of tensors

Associative property

Cartesian tensor

10.1080/03081087.2018.1515173

Cite

Citations (3)

Seismic Performance of Steel Box Bridge Piers with Earthquake-Resilient Function

Advances in Civil Engineering (2020)

Haifeng Li Wenwei Luo Jun Luo

A novel steel box bridge pier with replaceable energy dissipation wall plates at the base was proposed. After moderate earthquakes, the damaged energy dissipation wall plates and constraining steel plates on the two sides could be rapidly replaced, while the entire energy‐dissipated column at the base can also be replaced after rare earthquakes. In this way, the seismic capacity of the new type of steel box bridge pier could be restored after earthquakes. For the purpose of discussing the seismic performance of this novel steel box‐shaped bridge pier, the pseudostatic test and numerical simulation were performed. The results showed that the failure of the specimens in the pseudostatic tests occurred predominantly in the energy dissipation zone at the base. After replacing the damaged energy‐dissipated column at the base, the seismic behavior of the proposed steel bridge pier can be recovered rapidly. Axial compression ratio is an important factor influencing the seismic behavior of the novel steel box bridge pier. The strength of the energy dissipation wall plates influences the novel steel box‐shaped bridge pier’s bearing capacity and deformation capacity. Spacing between the horizontal stiffening ribs had little impact on the bearing capacity and deformation capacity of the proposed steel bridge pier. The larger the thickness of the energy dissipation wall plate, the higher the bearing capacity and deformation capacity of the steel box bridge pier. Finally, an empirical equation for the design of this novel steel bridge pier under cyclic loading was proposed.

Bridge (graph theory)

10.1155/2020/8877785

Cite

Citations (4)

Analysis of Effect Parameters of Track Settlement in Heavy Haul Railways

ICTE 2019 (2015)

Jianfeng Shen Yude Xu Haifeng Li Qing He Ye Lu

Ballast bed in heavy haul railway will accumulate residual deformation and lead to track accumulative settlement under the repeatedly influence of the dynamic load of train. Studying on rule LU Ye s of track settlement of heavy haul railway is the premise of variant design and maintenance management, the effects of transportation conditions and track structure parameters on ballast settlement were analyzed by improving the existing track settlement calculation model and building track structural finite element analysis model. The results show that vehicle running speed, axle load and railway traffic are main factors of controlling track deformation; it benefits to decrease track settlement by adopting heavy rail, increasing bottom area of sleeper, reducing space of sleeper; track settlement reduces by 12.3% when thickness of ballast increases from 30 cm to 40 cm, and track settlement increases by 25% when elastic modulus of ballast increases from 90 MPa to 150 MPa, however, increasing thickness of ballast leads to more maintenance work and small elastic modulus reduces the capacity of structure, therefore, it is important to select track structural parameters reasonably.

Ballast

Settlement (finance)

Track geometry

Axle load

10.1061/9780784479384.014

Cite

Citations (1)