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排序方式: 共有92条查询结果,搜索用时 62 毫秒
1.
Nonlinear Dynamics - This paper investigates the guaranteed cost positive consensus for linear multi-agent systems (MASs) with multiple time-varying delays and switching topologies. First,... 相似文献
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Telin Zhu Peipei Qi Jiao Wang Shanshan Di Zhiwei Wang Hao Xu Huiyu Zhao Qiang Wang Xinquan Wang Chenghui Zhang 《Journal of separation science》2022,45(7):1326-1335
Many plants have a high polyphenol content, which causes the matrix effect and makes the analysis of trace pesticide residues highly challenging. A common approach to improving matrix effects is to purify pesticides through the use of sorbents, but this requires a combination of multiple sorbents and extensive use. Zeolitic imidazolate framework-8 is widely used for pesticide analysis due to its high porosity, large specific surface area, and versatility. Here, we established and validated a modified quick, easy, cheap, effective, rugged, and safe method based on a zeolitic imidazolate framework-8 that was used to test the removal ability for polyphenols. To this end, 145 pesticide residues in peppermint, perilla, fennel, and mulberry leaves were analyzed by the modified method coupled with liquid chromatography with tandem mass spectrometry. The mean recoveries of all pesticide residues were in the range of 74.3–103.7%, with mean relative standard deviations ≤9.1% at spiked concentrations of 1, 10, 50, and 100 μg/kg for mulberry leaves. The limits of quantitation of the method ranged from 1 to 50 μg/kg. This study offers a reliable approach for the accurate quantitative analysis of various trace substances in the polyphenol-rich plants. 相似文献
4.
通过研究晶体生长工艺参数对Nb∶KTiOPO4(Nb∶KTP)晶体生长的影响,用熔盐顶部籽晶法获得尺寸为55mm×25mm×5mm的Nb∶KTP透明单晶.研究中发现熔体的温度梯度、籽晶和降温速率将严重影响Nb∶KTP晶体的生长.Nb离子的引入不利于Nb∶KTP晶体的生长,尤其是造成晶体易开裂,且沿a轴方向生长速度非常缓慢.同时,Nb的引入大大改变Nb∶KTP晶体的倍频性能.掺杂Nb浓度的摩尔分数为13;时,Nb∶KTP晶体的倍频的Ⅱ型相位匹配的截止波长缩短至937nm,且有效产生469nm倍频蓝光;掺杂Nb浓度的摩尔分数为3;时,Nb∶KTP晶体对Nd∶YAG的1.0642μm激光倍频的最佳相位匹配角为θ=88.32°,()=0°,非常接近90°非临界相位匹配方向. 相似文献
5.
Huang Lingxiong Zhang Ge Huang Chenghui Wei Yong Zhu Haiyong 《Journal of Russian Laser Research》2008,29(6):593-598
We develop a separate 1319 and 1338 nm Nd:YAG laser system with a blazing grating (600 lines/mm). The resonator of this system
has a Littrow grating configuration and a highly reflective mirror, in which the zero-order diffraction of the grating acts
as the laser output. By virtue of the wavelength-dependent reflectivity of the grating, a single-wavelength laser at 1319
nm or 1338 nm can be realized. In view of the laser rate equations and using the distribution of the blazing grating, we analyze
the oscillation conditions providing single-wavelength laser operation in the system. 相似文献
6.
Li Jingzhao Zhu Haiyong Zhenqiang Chen Zhang Ge Huang Chenghui Wei Yong Han Yongfei Chen Zhe Li Zhen 《Journal of Russian Laser Research》2008,29(3):288-295
We report a completely solid-state continuous-wave (CW) blue laser operating at 447 nm utilizing intracavity frequency tripling
of an LD-side-pumped Nd:YAlO3 (Nd:YAP) laser operating at 1341.4 nm. An LBO crystal with type-I critical phase matching and a KTP crystal with type-II
critical phase matching (CTM) were used for the second harmonic generation (SHG) and the third harmonic generation (THG),
respectively. In view of the analysis of the cavity stability, a four-mirror folded cavity was designed and the output characteristics
were theoretically analyzed. Experimental characteristics obtained were shown to be in agreement with the theoretical analysis.
The maximum output power of the 447 nm CW blue laser reached 114 mW, which corresponds to a red-to-blue conversion efficiency
of 9%. 相似文献
7.
Hongyuan Shen Yuping Zhou Ruirong Zeng Guifang Yu Qijing Ye Chenghui Huang Xiaoliang Huang Hong Liao 《Optics & Laser Technology》1986,18(4)
The eigen-oscillation mode of the Nd:YAP cw laser has been analysed. The influence of thermal effects arising from the pumping process on the output character of the 1.3414 μm Nd:YAP cw laser has been discussed. The crack problem of the reflective film at a 1.34 μm dielectric mirror has been solved. Based on the aforementioned work, we have been able to achieve an 82.8 W laser output at 1.3414 μm with a nearly polarized beam from a 5.8 mm diameter by 111 mm Nd:YAP rod. The overall efficiency and the slope efficiency are 1.15% and 2.02% respectively, and the fluctuation of the output power at 62 W is less than 1% during continuous operation for 45 min. 相似文献
8.
本文利用Lagnrange方程建立了卫星太阳电池翼伸展运动的数学模型.这是一个包含摩擦阻尼、结构阻尼和空气阻尼参数的非线性微分方程组.在用气垫消除了重力影响但存在空气阻尼的地面环境中,对实尺太阳电池翼模型进行了伸展运动的模拟试验并用频闪摄影技术记录了运动的时间历程.再利用最小p乘优化方法识别出该系统的各个阻尼参数.通过对系统运动方程进行数值积分求得的太阳电池翼的伸展运动历程与实测值相当吻合.取空气阻尼等于零,得出了太阳电池翼在无空气阻尼的太空中的伸展运动规律. 相似文献
9.
非晶/纳米晶Ni-Mo-Ce合金镀层结构及其催化析氢性能 总被引:1,自引:0,他引:1
在Ni-Mo合金镀液中添加适量的CeCl3溶液,获得了非晶+纳米晶混合结构的Ni-Mo-Ce合金镀层.用X射线衍射(xRD)和扫描电镜(SEM)测试技术研究镀层结构及其表面形貌.实验结果表明,随着Ce含量的增加,镀层中Mo元素含量有所提高,而Ni元素含量有所降低;镀层的显微硬度先增加后降低,当Ce加入量为2 g·L-1时,显微硬度最高.电解实验表明,Ni-Mo-Ce合金具有比Ni-Mo合金更优异的耐蚀性能和良好的催化析氢性能. 相似文献
10.
Rare Earth Ion Mediated Fluorescence Accumulation on a Single Microbead: An Ultrasensitive Strategy for the Detection of Protein Kinase Activity at the Single‐Cell Level
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Xiaobo Zhang Prof. Dr. Chenghui Liu Honghong Wang Hui Wang Prof. Dr. Zhengping Li 《Angewandte Chemie (International ed. in English)》2015,54(50):15186-15190
A single microbead‐based fluorescence imaging (SBFI) strategy that enables detection of protein kinase activity from single cell lysates is reported. We systematically investigated the ability of various rare earth (RE) ions, immobilized on the microbead, for specific capturing of kinase‐induced phosphopeptides, and Dy3+ was found to be the most prominent one. Through the efficient concentration of kinase‐induced fluorescent phosphopeptides on a Dy3+‐functionalized single microbead, kinase activity can be detected and quantified by reading the fluorescence on the microbead with a confocal fluorescence microscope. Owing to the extremely specific recognition of Dy3+ towards phosphopeptides and the highly‐concentrated fluorescence accumulation on only one microbead, ultrahigh sensitivity has been achieved for the SBFI strategy which allows direct kinase analysis at the single‐cell level. 相似文献