20 Result(s)

Article

Densification of porous 8 mol% yttria-stabilized zirconia component: modelling and experimental studies

In this paper, the densification of a ceramic powder matrix that contained large macropores of the size much larger than the average grain size of the matrix was studied. The grain-boundary diffusion controlle...

J. Lu, X. C. Song, T. S. Zhang, H. H. Hng, J. Ma in Journal of Materials Science (2010)

Article

Perovskite crystallization kinetics and dielectric properties of the PMN-PT films prepared by polymer-modified sol-gel processing

Pb(Mg_1/3,Nb_2/3)O₃-PbTiO₃ (PMN-PT, 43% PT) thin films have been developed by modified sol-gel processing with polyvinylpyrrolidone (PVP) as a modifier and lead nitrate as a lead source. With PVP modification, pero...

Z. H. Du, T. S. Zhang, M. M. Zhu, J. Ma in Journal of Materials Research (2009)

Article

Fabrication of porous/hollow tin (IV) oxide skeletons from polypeptide mediated self-assembly

We demonstrate the aqueous self-assembly of ligand-assisted SnO₂ sol precursors onto preformed poly-l-lysine templates through interfacial electrostatic forces (COO⁻/NH₃⁺). On the removal of organics, two unique ...

Jie Zhu, T. S. Zhang, J. Ma, B. Y. Tay in Journal of Materials Research (2007)

Article

Effect of polyvinylpyrrolidone on the formation of perovskite phase and rosette-like structure in sol-gel–derived PLZT films

Poly-vinylpyrrolidones (PVP) with different molecular weights were used to modify the sol-gel solutions for preparing Pb_0.91La_0.09(Zr_0.65,Ti_0.35)_0.9775O₃ (PLZT, 9/65/35) thin films. The crystallization behavior a...

Z.H. Du, T.S. Zhang, J. Ma in Journal of Materials Research (2007)

Article

Mechanochemical synthesis of nano-sized Bi₂V_0.9Cu_0.1O_5.35 powders

Nano-sized Bi₂V_0.9Cu_0.1O_5.35 powders were synthesized via a mechanochemical route from the component oxide mixture. However, a ball-milling duration of over 30 h was needed to ensure a high phase purity. Otherwis...

T. S. Zhang, J. Ma, L. B. Kong in Journal of Materials Research (2006)

Article

Characterization of (Zr_{1 − x}Ce _x )_0.84Y_0.16O_{2 −δ} ceramics (0 ≤ x ≤ 0.1) derived by a wet chemical route

T. S. Zhang, J. Ma, Y. Z. Chen, S. H. Chan in Journal of Materials Science (2005)

Article

Effect of SiO₂ content on the ionic conductivity of Ce_0.8Gd_0.2O_2−δ ceramics

T. S. Zhang, J. Ma, L. B. Kong, S. H. Chan in Journal of Materials Science (2004)

Article

Convergence of Symmetric Diffusions on Wiener Spaces

In this paper, we study the distorted Ornstein-Uhlenbeck processes associated with given densities on an abstract Wiener space. We prove that the laws of distorted Ornstein-Uhlenbeck processes converge in tota...

A. Posilicano, T. S. Zhang in Acta Mathematicae Applicatae Sinica (2004)

Article

Preparation and electrical properties of dense submicron-grained Ce_0.8Gd_0.2O_{2 − δ} ceramics

T. S. Zhang, J. Ma, L. B. Kong, P. Hing, Y. J. Leng… in Journal of Materials Science Letters (2003)

Article

Transparent Lead Lanthanum Zirconate Titanate Ceramics Derived from Oxide Mixture Via a Repeated Annealing Process

Lead lanthanum zirconate titanate (PLZT9/65/35) ceramics were prepared from their oxide mixture via reactive sintering without involving a calcination step. PLZT ceramics sintered at 1000 °C for 4 h possessed ...

L. B. Kong, J. Ma, T. S. Zhang, R. F. Zhang in Journal of Materials Research (2002)

Article

Preparation of antiferroelectric lead zirconate titanate stannate ceramics by high-energy ball milling process

Lead zirconate titanate stannate powders doped with lanthanum and niobium, namely [Pb_0.99Nb_0.02(Zr_0.85Sn_0.13Ti_0.02)_0.98O₃, or PNZST) and (Pb_0.9La_0.02(Zr_0.65Sn_0.31Ti_0.04)O₃, or PLZST], were synthesized by a high-e...

L. B. Kong, J. Ma, T. S. Zhang, W. Zhu… in Journal of Materials Science: Materials in… (2002)

Article

Generalized Feynman–Kac Semigroups, Associated Quadratic Forms and Asymptotic Properties

In this paper, we study the Feynman–Kac semigroup

T.S. Zhang in Potential Analysis (2001)

Article

Pb(Zr_xTi_1−x)O₃ ceramics via reactive sintering of partially reacted mixture produced by a high-energy ball milling process

Partially reacted mixtures of Pb(Zr_xTi_1−x)O₃ and its corresponding starting oxide components were obtained by a high-energy ball milling process. The partially reacted powders were characterized by x-ray diffract...

L. B. Kong, J. Ma, T. S. Zhang, W. Zhu, O. K. Tan in Journal of Materials Research (2001)

Article

Existence and Uniqueness of Invariant Measures: An Approach via Sectorial Forms

We prove the existence and uniqueness for invariant measures of strongly continuous semigroups on L ² (X;μ ) , where X is a ...

V. Bogachev, M. Röckner, T. S. Zhang in Applied Mathematics and Optimization (2000)

Chapter and Conference Paper

On the Strong Feller Property of the Semigroups Generated by Non-divergence Operators with L ^p -Drift

In this article we give a probabilistic proof of the strong Feller property of the semiproups associated with generators of the type $...

M. Röckner, T. S. Zhang in Stochastic Analysis and Related Topics VI (1998)

Article

On the quasi-everywhere existence of the local time of the solution of a stochastic differential equation

In this paper we prove that the local time of the solution of a stochastic differential equation exists except for a set of zero capacity.

T. S. Zhang in Potential Analysis (1996)

Article

The pressure equation for fluid flow in a stochastic medium

An equation modelling the pressurep(x) =p(x, w) atx ∈D ⊂R ^d of an incompressible fluid in a heterogeneous, isotropic medium with a stochastic permeabilityk(x, w) ≥ 0 is the sto...

H. Holden, T. Lindstrøm, B. Øksendal, J. Ubøe, T. -S. Zhang in Potential Analysis (1995)