Calculation of the Critical Energy of the Power System with Protection Operation (2009)
Lin, Jikeng, Wang, Xudong, Zheng, Weihong
Whether a disturbance will trigger unexpected protection operation to exacerbate the normal operation state or even lead to the unstable state depends on the transient energy that the system gains...
Calculation of the Critical Energy of the Power System with Protection Operation (2009)
Lin, Jikeng, Wang, Xudong, Zheng, Weihong
Whether a disturbance will trigger unexpected protection operation to exacerbate the normal operation state or even lead to the unstable state depends on the transient energy that the system gains...
Calculation of the Critical Energy of the Power System with Protection Operation (2009)
Lin, Jikeng, Wang, Xudong, Zheng, Weihong
Whether a disturbance will trigger unexpected protection operation to exacerbate the normal operation state or even lead to the unstable state depends on the transient energy that the system gains...
Calculation of the Critical Energy of the Power System with Protection Operation (2009)
Lin, Jikeng, Wang, Xudong, Zheng, Weihong
Whether a disturbance will trigger unexpected protection operation to exacerbate the normal operation state or even lead to the unstable state depends on the transient energy that the system gains...
Fjaerestad, John O., Zheng, Weihong, Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We use series expansion methods to study ground- and excited-state properties in the helically ordered phase of spin-1/2 frustrated antiferromagnets on an anisotropic triangular lattice. We calculate...
Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet (2006)
Zheng, Weihong, Fjaerestad, John O., Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We use series expansion methods to calculate the dispersion relation of the one-magnon excitations for the spin-1/2 triangular-lattice nearest-neighbor Heisenberg antiferromagnet above a...
Critical Behaviour of One-particle Spectral Weights in the Transverse Ising Model (2006)
Hamer, C. J., Oitmaa, J., Zheng, Weihong, McKenzie, Ross H.
We investigate the critical behaviour of the spectral weight of a single quasiparticle, one of the key observables in experiment, for the particular case of the transverse Ising model.Series...
Zheng, Weihong, Hamer, Chris, Singh, Rajiv
We calculate the excitation spectrum and spectral weights of the alternating antiferromagnetic-ferromagnetic spin-half Heisenberg chain with exchange couplings $J$ and $-|\lambda|J$ as a power series...
White and gray matter development in human fetal, newborn and pediatric brains (2006)
Huang,Hao, Zhang,Jiangyang, Wakana,Setsu, Zheng, Weihong, Ren,Tianbo, Richards, Linda J., ...
Brain anatomy is characterized by dramatic growth from the end of the second trimester through the neonatal stage. The characterization of normal axonal growth of the white matter tracts has not been...
Single-hole properties of the t-J model on the honeycomb lattice (2005)
Luscher, Andreas, Laeuchli, Andreas, Zheng, Weihong, Sushkov, Oleg P.
Motivated by the possible charge ordering in the recently discovered superconductor Na_xCoO_2 yH_2O, which at filling x=1/3 would correspond to a half-filled honeycomb lattice, we investigate the...
Hard Core Bosons on the Triangular Lattice at Zero Temperature: A Series Expansion Study (2005)
Oitmaa, J., Zheng, Weihong, Tompsett, D.
We use high order linked cluster series to investigate the hard core boson model on the triangular lattice, at zero temperature. Our expansions, in powers of the hopping parameter $t$, probe the...
Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets (2005)
Zheng, Weihong, Fjaerestad, John O., Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We use series expansions to study the excitation spectra of spin-1/2 antiferromagnets on anisotropic triangular lattices. For the isotropic triangular lattice model (TLM) the high-energy spectra show...
Zheng, Weihong, Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We present the temperature dependence of the uniform susceptibility of spin-half quantum antiferromagnets on spatially anisotropic triangular lattices, using high-temperature series expansions. We...
Magnon and Hole Excitations in the Two-Dimensional Half-filled Hubbard Model (2005)
Zheng, Weihong, Singh, Rajiv R. P., Oitmaa, J., Sushkov, O. P., Hamer, C. J.
Spin and hole excitation spectra and spectral weights are calculated for the half-filled Hubbard model, as a function of $t/U$. We find that the high energy spin spectra are sensitive to charge...
Zheng, Weihong, Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We present the temperature dependence of the uniform susceptibility of spin-half quantum antiferromagnets on spatially anisotropic triangular lattices, using high-temperature series expansions. We...
Zheng, Weihong, Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We present the temperature dependence of the uniform susceptibility of spin-half quantum antiferromagnets on spatially anisotropic triangular lattices, using high-temperature series expansions. We...
SHENG, YAN, ZHENG, WEIHONG, PEI, KEQUAN, MA, KEPING
• Background and Aims China is one of the countries most severely affected by desertification. Haloxylon ammodendron (Amaranthaceae) is an ecologically important component of the desert ecosystem...
SHENG, YAN, ZHENG, WEIHONG, PEI, KEQUAN, MA, KEPING
• Background and Aims China is one of the countries most severely affected by desertification. Haloxylon ammodendron (Amaranthaceae) is an ecologically important component of the desert ecosystem...
SHENG, YAN, ZHENG, WEIHONG, PEI, KEQUAN, MA, KEPING
• Background and Aims China is one of the countries most severely affected by desertification. Haloxylon ammodendron (Amaranthaceae) is an ecologically important component of the desert ecosystem...
Zheng, Weihong, Oitmaa, J., Hamer, C. J.
We have extended our previous series studies of quantum antiferromagnets at zero temperature by computing the one-magnon dispersion curves and various structure factors for the linear chain, square...
Zheng, Weihong, Singh, Rajiv R. P., McKenzie, Ross H., Coldea, Radu
We present the temperature dependence of the uniform susceptibility of spin-half quantum antiferromagnets on spatially anisotropic triangular-lattices, using high temperature series expansions. We...
Curie and Neel Temperatures of Quantum Magnets (2004)
We estimate, using high-temperature series expansions, the transition temperatures of the spin 1/2, 1 and 3/2 Heisenberg ferromagnet and antiferromagnet in 3-dimensions. The manner in which the...
We use linked-cluster series expansions, both at T=0 and high temperature, to analyse the phase structure of the spin-$\half$ Heisenberg antiferromagnet with competing first and second-neighbor...
Sengupta, Pinaki, Zheng, Weihong, Singh, Rajiv R. P.
Motivated by the geometry of spins in the material CaCu$_2$O$_3$, we study a two-layer, spin-half Heisenberg model, with nearest-neighbor exchange couplings J and \alpha*J along the two axes in the...
Dynamical Structure Factor for the Alternating Heisenberg Chain: A Linked Cluster Calculation (2003)
Hamer, Chris J., Zheng, Weihong, Singh, Rajiv R. P.
We develop a linked cluster method to calculate the spectral weights of many-particle excitations at zero temperature. The dynamical structure factor is expressed as a sum of exclusive structure...
The Mixed Spin S=(1/2,1) XXZ Ferrimagnet at Zero Temperature (2003)
Linked cluster series expansions about the Ising limit are used to study ground state preperties, viz. ground state energy, magnetization and excitation spectra, for mixed spin S=(1/2,1) quantum...
Series study of the One-dimensional S-T Spin-Orbital Model (2001)
We use perturbative series expansions about a staggered dimerized ground state to compute the ground state energy, triplet excitation spectra and spectral weight for a one-dimensional model in which...
Linked Cluster Series Expansions for Two-Particle Bound States (2000)
Zheng, Weihong, Hamer, C. J., Singh, R. R. P., Trebst, Simon, Monien, Hartmut
We develop strong-coupling series expansion methods to study two-particle spectra of quantum lattice models. At the heart of the method lies the calculation of an effective Hamiltonian in the...
Zheng, Weihong, Hamer, C. J., Singh, R. R. P., Trebst, Simon, Monien, Hartmut
We use recently developed strong-coupling expansion methods to study the two-particle spectra for the frustrated alternating Heisenberg model, consisting of an alternating nearest neighbor...