Publications by authors named "Jing-Wei Ji"
This study compares how a modified distributed Bragg reflector (DBR) and yellow color filter (Y-CF) increase the color purity, viewing angle, and brightness of the quantum dot color conversion layer (QDCC) for micro-LED displays. We designed and built a 53-layer high-performance modified DBR with almost total blue leakage filtering (T %: 0.16 %) and very high G/R band transmittance (T %: 96.
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- Laser cooling has greatly impacted atomic and quantum physics research, particularly in microgravity environments.
- Our experiment in the TianGong-2 space lab, which lasted 34 months, showed that laser cooling quality remained stable and allowed us to systematically study its properties in orbit.
- We found that cold atom techniques, like magneto-optical trapping, work more efficiently in microgravity, leading to lower temperatures and reduced loss rates in atom cooling, setting the stage for future long-term space missions.
Article Synopsis
- A transportable rubidium atomic fountain clock is essential for precise time-frequency measurements due to its stability and high reliability compared to traditional clocks.
- Developed by the Shanghai Institute of Optical and Fine Mechanics, this clock successfully maintained its performance even after being transported over 1000 km without the need for hardware adjustments.
- During nearly three months of operation alongside a cesium fountain clock, the rubidium clock demonstrated impressive frequency repeatability, averaging less than 3.8 × 10, indicating its effectiveness as a reliable timekeeping device.
Space qualified microwave source for cold atom clock operating in orbit.
Rev Sci Instrum
November 2018
The space cold atom clock (CAC) suffers more degradation of frequency stability from the local oscillator noise compared with fountain clocks operating on the ground because of the larger dead time of the clock cycle. Therefore, low phase noise is required for the microwave source of the space CAC in addition to robustness, compactness, and adaptability to the space environment. This paper presents the design and measurements of a low-phase-noise space qualified microwave source for the cold atom clock experiment in space CAC operating in the Tiangong-2 Chinese space laboratory.
View Article and Find Full Text PDFAtomic clocks based on laser-cooled atoms are widely used as primary frequency standards. Deploying such cold atom clocks (CACs) in space is foreseen to have many applications. Here we present tests of a CAC operating in space.
View Article and Find Full Text PDFAlthough spermatogenesis is a complex process under hormonal control, which includes mainly follicle stimulating hormone (FSH) and androgens, little is known about the intra-testicular mediators of these hormones. In the present study, galectin-3 (Gal-3) expression has been identified in human, rat and porcine testes where it is under hormonal control. Gal-3 is present in Sertoli cells and appears to be absent in human and (probably) in rat germ cells.
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