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101.
在基于机器视觉的轮廓测量系统中,由于摄像机的透镜透光率不均,成像中存在光学畸变,对测量精度造成影响。为了对光学畸变进行校正,论文首先建立畸变数学模型,然后使用系统测量正方形标定板得到存在畸变的轮廓数据,根据存在畸变的轮廓数据的几何特征和直线约束条件使用LM优化算法完成对畸变模型中参数的标定。通过实验多次标定同一套轮廓测量系统,将标定结果与已有方法进行比较。实验结果表明,相较于已有算法,该论文所提方法多次标定的结果标准差更小,说明该论文所提方法具有更好的鲁棒性。 相似文献
102.
Development of a Highly Selective,Sensitive, and Fast Response Upconversion Luminescent Platform for Hydrogen Sulfide Detection 下载免费PDF全文
Juanjuan Peng Chai Lean Teoh Xiao Zeng Animesh Samanta Lu Wang Wang Xu Dongdong Su Lin Yuan Xiaogang Liu Young‐Tae Chang 《Advanced functional materials》2016,26(2):191-199
Hydrogen sulfide (H2S) has been recognized as one of most important gaseous signaling molecules mediated by a variety of physiological and pathological processes. Yet, its functions remain largely elusive due to the lack of potent monitoring methods. Hereby this issue is addressed with a powerful new platform—dye‐assembled upconversion nanoparticles (UCNPs). A series of chromophores with different absorption bands and fast responses towards H2S is combined with UCNPs and results in a library of H2S sensors with responsive emission signals ranging from the visible to the near‐infrared (NIR) region. These nanoprobes demonstrate highly selective and rapid responses to H2S in vitro and in cells. Furthermore, H2S levels in blood can be detected using the developed nanoprobes. Hence the reported H2S sensing platform can serve as a powerful diagnostic tool to research H2S functions and to investigate H2S‐related diseases. 相似文献
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Jing‐Qi Chi Xiao‐Jun Zeng Xiao Shang Bin Dong Yong‐Ming Chai Chen‐Guang Liu Melinda Marin Yadong Yin 《Advanced functional materials》2019,29(33)
Rational design and controllable synthesis of well‐defined nanostructures with high stability and Pt‐like activity for hydrogen evolution reaction (HER) are critical for renewable energy conversion. Herein, a unique pyrolysis strategy is demonstrated for the synthesis of RhPx nanoparticles (NPs) in N, P co‐doped thin carbon nanoshells (RhPx@NPC nanoshells) that display high electrocatalytic activity and stability over a wide pH range. This strategy involves simultaneous phosphorization and pyrolysis processes that can produce highly‐dispersed RhPx NPs within N, P co‐doped carbon nanoshells and at the same time induce thinning of carbon nanoshells from inside out. The resulting RhPx@NPC nanoshells not only possess Pt‐like activity for HER with low overpotentials to achieve 10 mA cm?2 (22 mV in 0.5 m H2SO4, 69 mV in 1.0 m KOH, and 38 mV in 1.0 m phosphate buffered saline (PBS)) but also provide long‐term durability in a wide pH range. The remarkable HER performance of RhPx@NPC nanoshells is ascribed to the high surface area, abundant mesoporosity, strong catalyst–support interaction, ultrathin carbon encapsulation, and N, P co‐doping. This work provides an effective strategy for designing heterostructured electrocatalysts with high catalytic activity and stability desired for reactions that may occur under harsh conditions. 相似文献
104.
导弹发射装置是目前我国某型战斗机所装备的主要作战武器之一,它的性能直接影响到战斗机的战斗能力,由于目前缺乏有效的故障诊断系统和仪器对导弹发射装置进行测试,所以设计了一种空空导弹发射装置故障诊断仪器;该仪器以工业控制计算机为核心,采用数据库编程技术编程,综合运用标准接口及总线技术、故障诊断技术,FIFO技术,有效地提高了仪器的通用性、可靠性;研究结果表明,该仪器能够对某型空空导弹发射装置的各种故障进行快速准确的诊断,提高部队的保障能力,具有很好的推广应用前景和重大的经济效益. 相似文献
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The microstructure–mechanical property relationship of a Cu-bearing low-carbon high-strength low-alloy steel, subjected to a novel multistage heat treatment inc... 相似文献
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B. Chai S.-C. Zhang C.-R. Qiu H.-B. Zhang Y.-X. Lai Q. Xin 《Journal of Infrared, Millimeter and Terahertz Waves》2007,28(6):423-432
A linear theory based on Maxwell-Vlasov equations and the Laplace transform is presented to describe the large-orbit coaxial-waveguide cyclotron autoresonance maser (CARM) amplifier. A 35-GHz, TE5,1-mode large-orbit coaxial-waveguide CARM amplifier is specifically analyzed. Good agreement between the linear theory and the nonlinear simulations is found in the exponentially growing region of the wave. Results show that the operating magnetic field and the electron-beam energy and average radius substantially affect the power, and especially, a small beam current may be unsuitable to a large-orbit CARM amplifier operation. 相似文献
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