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- 저자 : Weiyan Zheng (검색결과 3 건)
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Research on Thermal Refocusing System of High-resolution Space Camera
Weiyan Li,Qunbo Lv,Jian Wei Wang,Na Zhao,Zheng Tan,Linlin Pei 한국광학회 2022 Current Optics and Photonics Vol.6 No.1
A high-resolution camera is a precise optical system. Its vibrations during transportation and launch, together with changes in temperature and gravity field in orbit, lead to different degrees of defocus of the camera. Thermal refocusing is one of the solutions to the problems related to in-orbit defocusing, but there are few relevant thermal refocusing mathematical models for systematic analysis and research. Therefore, to further research thermal refocusing systems by using the development of a high-resolution micro-nano satellite (CX6-02) super-resolution camera as an example, we established a thermal refocusing mathematical model based on the thermal elasticity theory on the basis of the secondary mirror position. The detailed design of the thermal refocusing system was carried out under the guidance of the mathematical model. Through optical–mechanical–thermal integration analysis and Zernike polynomial calculation, we found that the data error obtained was about 1%, and deformation in the secondary mirror surface conformed to the optical index, indicating the accuracy and reliability of the thermal refocusing mathematical model. In the final ground test, the thermal vacuum experimental verification data and in-orbit imaging results showed that the thermal refocusing system is consistent with the experimental data, and the performance is stable, which provides theoretical and technical support for the future development of a thermal refocusing space camera.
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Weiyan Liu,Huiming Ji,Jian Wang,Xuerong Zheng,Junyun Lai,Junna Ji,Tongfei Li,Yuanliang Ma,Haiqin Li,Suqin Zhao,Zhengguo Jin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
"Uniform hexagonal covellite CuS thin films were deposited at room temperature by an in situ solution chemical reaction using copper precursor solid films as cationic source and ammonium sulfide ethanol solution as anionic reaction medium. We investigated the influence of both ethanolamine and butanol contents used in copper nitrate/ethylene glycol monomethylether (EGME) cationic solution for the preparation of copper precursor solid films, deposition cycle numbers and annealing treatment of the as-grown thin films by X-ray diffraction (XRD), FESEM, energy dispersive X-ray fluorescence EDX, transmission electron microscopy–Selected area electronic diffraction (TEM–SAED), atomic force microscopy (AFM) and ultraviolet-visible-near-infrared (UV-Vis–NIR) measurements. Photo-response of the CuS thin films was characterized by linear sweep voltammetry. The deposited CuS thin films were used to sensitize TiO2 anodes for solar cell application. The results showed that the CuS films had two-dimension oriented, half-sheet shaped growing morphology standing disorderly but vertically to substrates, and the calculated texture coefficient TC(102) verified that the half-sheet shaped crystallites had (102) plane orientation. This in situ multi-deposition process had an average deposited rate of 9 nm per cycle, and a selfperfect function to grow smooth, uniform and 2D oriented morphology with increase in the dip-cycle numbers. The photocurrent density was 14.5 Ma/cm2 at 1 V versus Ag/AgCl electrode for the annealed CuS thin films. CuS-sensitized TiO2 solar cells had a maximum conversion efficiency of 0.224%."
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Interleukin-6 signaling regulates hematopoietic stem cell emergence
Ruxiu Tie,Honghu Li,Shuyang Cai,Zuyu Liang,Wei Shan,Binsheng Wang,Yamin Tan,Weiyan Zheng,He Huang 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
Hematopoietic stem cells (HSCs) produce all lineages of mature blood cells for the lifetime of an organism. Invertebrates, HSCs derive from the transition of the hemogenic endothelium (HE) in the floor of the embryonic dorsalaorta. Most recently, a series of proinflammatory factors, such as tumor necrosis factor-α, interferon-γ, and Toll-likereceptor 4, have been confirmed to play a key role in HSC specification. However, the full complement of necessarysignaling inputs remains unknown to date. Here, we show that interleukin-6R (IL6R) via IL6 is required and sufficient forHSC generation. We found that Notch activates IL6R by regulating its expression in the HE and in HSCs. The secretionof IL6 mainly originates from HSC-independent myeloid cells, but not from HSCs and their adjacent vascularendothelial cells. In addition, blocking IL6 signaling does not affect vascular development or the production ofprimitive erythrocytes. Taken together, our results uncover a previously obscure relationship between IL6 signaling andHSC production and provide new insights into HSC regeneration using proinflammatory factors in vitro.
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