Harbin Engineering University

About: Harbin Engineering University is a education organization based out in Harbin, Heilongjiang, China. It is known for research contribution in the topics: Control theory & Microstructure. The organization has 31149 authors who have published 27940 publications receiving 276787 citations. The organization is also known as: HEU.

Resilient Asynchronous $H_{\infty }$ Filtering for Markov Jump Neural Networks With Unideal Measurements and Multiplicative Noises

Abstract: This paper is concerned with the resilient $H_{\infty }$ filtering problem for a class of discrete-time Markov jump neural networks (NNs) with time-varying delays, unideal measurements, and multiplicative noises. The transitions of NNs modes and desired mode-dependent filters are considered to be asynchronous, and a nonhomogeneous mode transition matrix of filters is used to model the asynchronous jumps to different degrees that are also mode-dependent. The unknown time-varying delays are also supposed to be mode-dependent with lower and upper bounds known a priori . The unideal measurements model includes the phenomena of randomly occurring quantization and missing measurements in a unified form. The desired resilient filters are designed such that the filtering error system is stochastically stable with a guaranteed $H_{\infty }$ performance index. A monotonicity is disclosed in filtering performance index as the degree of asynchronous jumps changes. A numerical example is provided to demonstrate the potential and validity of the theoretical results.

Electrospinning Derived One‐Dimensional LaOCl: Ln3+ (Ln = Eu/Sm, Tb, Tm) Nanofibers, Nanotubes and Microbelts with Multicolor‐Tunable Emission Properties

Abstract: One-dimensional LaOCl: Ln(3+) (Ln(3+) = Eu3+/Sm3+, Tb3+, Tm3+) nanofibers, nanotubes, and quasi-1D microbelts are successfully prepared by a sol-gel/electrospinning process. XRD, FT-IR, SEM, TEM, as well as photoluminescence (PL) and cathodoluminescecne (CL) spectra are used to characterize the resulting samples. Through a heat treatment process at high temperature, the as-prepared samples are well-crystallized with the tetragonal structure of LaOCl. Under ultraviolet radiation and low-voltage electron beam excitation, the LaOCl: Eu3+, LaOCl: Sm3+, LaOCl: Tb3+, and LaOCl: Tm3+ samples give the characteristic transitions of Eu3+ (D-5(0, 1, 2) -> F-7(0, 1, 2, 3, 4)), Sm3+ ((4)G(5/2) -> H-6(5/2,) (7/2,) (9/2)), Tb3+ (D-5(3, 4) -> F-7(2, 3, 4, 5, 6)), and Tm3+ (D-1(2), (1)G(4) -> F-3(4), H-3(6)), respectively. Moreover, there exists simultaneous luminescence of Tb3+, Tm3+, Eu3+, or Sm3+ individually when codoping them in the single-phase LaOCl host (for example, LaOCl: Tb3+, Eu3+/Sm3+ ; LaOCl: Tm3+, Eu3+/Sm3+; LaOCl: Tb3+, Tm3+, Eu3+/Sm3+ systems), which is beneficial to tune the emission colors. Under low-voltage electron beam excitation (1-5 kV), a variety of colors can be efficiently adjusted in a wide triangle region enveloped by three CIE chromaticity coordinate points [LaOCl: Eu3+, (x = 0.6039, y = 0.3796); LaOCl: Tb3+, (x = 0.2452, y = 0.5236); LaOCl: Tm3+, (x = 0.1456, y = 0.0702)] for mono- and co-doped LaOCl: Ln(3+) (Eu3+, Sm3+, Tb3+, Tm3+) samples, making these materials have potential applications in field-emission display devices.