Haiqin Sun

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Reversible luminescence photoswitching upon photochromic reactions with excellent reproducibility is achieved in a new inorganic luminescence material: Na(0.5)Bi(2.5)Nb2O9: Pr(3+) (NBN:Pr) ferroelectric oxides. Upon blue light (452 nm) or sunlight irradiation, the material exhibits a reversible photochromism (PC) performance between dark gray and green(More)
A luminescence ferroelectric oxide, Na(0.5)Bi(2.5)Nb2O9 (NBN), system with bismuth layer structure introduced by lanthanide ion (Er(3+)) has been demonstrated to exhibit reversible, high-contrast luminescence modulation (95%) and excellent fatigue resistance based on visible-light-driven photochromism (407 nm or sunlight). The coloration and decoloration(More)
High luminescent switching contrast of photochromic materials is extremely important in improving the sensitivity and resolution of optical switches and high-density optical data storage devices. To date, conventional methods, such as tuning absorption and emission bands based on electron or resonance energy transfer mechanisms in well-known organic(More)
This paper presents a robust PI tracking control strategy with mixed H2 and H∞ performance for general non-Gaussian systems based on the square root B-spline model for the probability density functions (PDFs).The main objective is to design a generalized proportional-integral (PI) control strategy such that the PDF can follow a target one with the enhanced(More)
Reversible luminescence modulation upon photochromic reactions with excellent reproducibility was achieved from Eu(3+) doped Bi2.5Na0.5Nb2O9 multifunctional ferroelectrics. The material exhibits strong sensitivity to visible light or sunlight with fast response time without inducing any structural changes.
Eu 2 O 3 (Alfa Aesar, 99.9%) powders as starting materials were weighted and mixed with ethanol, dried, calcined at 900 °C for 4 h in air. After the calcination, these powders were remixed and then dried. Subsequently, the dried powders were granulated with 8 wt% polyvinyl alcohol (PVA) binder, and pressed into disk-shaped pellets with diameter of 10 mm at(More)
Improving levels of healthcare service to enhance patient care are not only what patients’ demands of medical staff, but also what the medical staff demands of the hospital managers. The practical experiences of Xuzhou Central Hospital have proved that a carefully designed hospital culture helps to mobilize the enthusiasm of medical staff, improve patient(More)
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