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Multilayer black phosphorus as saturable absorber for an Er:Lu_(2)O_(3) laser at~3 μm

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Photonics Research 2016年第5期4卷 181-186页

作者： Mingqi Fan Tao li Shengzhi Zhao guiqiu li Xiaochun Gao Kejian Yang Dechun li Christian Krankel School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Key Laboratory of Colloid and Interface Chemistry of State Education Ministry School of Chemistry and Chemical Engineering Shandong University Institut für Laser-Physik Universitat Hamburg Hamburg Centre for Ultrafast Imaging Universitat Hamburg

Multilayer black phosphorus(BP) nanoplatelets of different thicknesses were prepared by the liquid phase exfoliation method and deposited onto yttrium aluminum garnet substrates to form saturable absorbers(SAs). These were characterized with respect to their thickness-dependent saturable absorption properties at 3 μm. The BP-SAs were employed in a passively Q-switched Er:Lu_2O_3 laser at 2.84 μm. By using BP exfoliated in different solvents,stable pulses as short as 359 ns were generated at an average output power of up to 755 m W. The repetition rate in the experiment was 107 k Hz, corresponding to a pulse energy of 7.1 μJ. These results prove that BP-SAs have a great potential for optical modulation in the mid-infrared range.

关键词： Multilayer black phosphorus as saturable absorber for an Er BP IPA YAG

High peak power subnanosecond pulse characteristics with different wall structured CNTs in a doubly QML Nd:Lu_(0.15)Y_(0.85)VO_4 laser

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Photonics Research 2017年第1期5卷 46-51页

作者： Wenjing Tang Jia Zhao Kejian Yang Shengzhi Zhao guiqiu li Dechun li Tao li Wenchao Qiao School of Information Science and Engineering Shandong University

By simultaneously employing both an electro-optic modulator and carbon nanotube saturable absorber(CNT-SA)in a dual-loss modulator, a subnanosecond single mode-locking pulse underneath a Q-switched envelope with high peak power was generated from a doubly Q-switched and mode-locked(QML) Nd:Lu_(0.15)Y_(0.85)VO_4 laser at1.06 μm for the first time, to our knowledge. CNTs with different wall structures—single-walled CNTs(SWCNTs),double-walled CNTs(DWCNTs), and multi-walled CNTs(MWCNTs)—were used as SAs in the experiment to investigate the single mode-locking pulse characteristics. At pump power of 10.72 W, the maximum peak power of1.312 MW was obtained with the DWCNT.

关键词： CNTs VO4 laser High peak power subnanosecond pulse characteristics with different wall structured CNTs in a doubly QML Nd:Lu Nd

Subnanosecond KTiOPO4 optical parametric oscillator intracavity pumped by a Kerr-lens, mode-locked YVO4/Nd:YVO4 laser coupled with an acousto-optic modulator

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Photonics Research 2015年第5期3卷 260-264页

作者： Hongwei Chu Jia Zhao Kejian Yang Shengzhi Zhao Tao li Dechun li guiqiu li Wenchao Qiao School of Information Science and Engineering Shandong University

A Kerr-lens, mode-locked YVO4∕Nd:YVO4laser coupled with an acousto-optic modulator（AOM） Q-switching near1064 nm was employed to pump an intracavity KTi OPO4（KTP） optical parametric oscillator. A subnanosecond signal wave near 1572 nm with low repetition rate was realized. At an AOM repetition rate of 8 kHz, the maximum output power was 165 mW. The highest average pulse energy, the shortest duration, and the highest peak power of a mode-locking signal pulse were estimated to be ～10.3 μJ, ～120 ps, and ～82 kW, respectively.

关键词： mode-locked YVO4/Nd:YVO4 laser coupled with an acousto-optic modulator Subnanosecond KTiOPO4 optical parametric oscillator intracavity pumped by a Kerr-lens IOPO KTP Nd

河南省南水北调受水区浅层地下水埋深变化分析

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水文 2024年第3期44卷 89-97页

作者：高婷窦明周雨泽胡浩东李桂秋郑州大学水利与交通学院河南郑州450001 郑州大学生态与环境学院河南郑州450001 宁波市水利水电规划设计研究院有限公司浙江宁波330200

南水北调中线工程运行后地下水大量压采,需定量评估河南省受水区地下水埋深的变化特征。利用河南省2000—2020年受水区342口浅层地下水监测井的平均埋深、枯水期最大埋深和丰水期最小埋深年数据,通过空间插值法、水位动态法分析11个地... 详细信息

南水北调中线工程运行后地下水大量压采,需定量评估河南省受水区地下水埋深的变化特征。利用河南省2000—2020年受水区342口浅层地下水监测井的平均埋深、枯水期最大埋深和丰水期最小埋深年数据,通过空间插值法、水位动态法分析11个地市地下水埋深的变化特征,采用径向基函数神经网络模型计算地下水埋深关键驱动因素的贡献度。同时,统计用水结构中地下水的占比进行分析论证。结果表明:空间上,调水压采的成效主要为埋深4~平均埋深>枯水期最大埋深,同时郑州等7个地市的三个地下水埋深指标均得到恢复。影响因素上,相较降水量,地下水开采量对地下水埋深的影响更大。用水结构上,用水总量及四个分类中地下水占比在调水后显著下降。

关键词：南水北调地下水埋深变化特征径向基函数河南省

High-quality 2-μm Q-switched pulsed solid-state lasers using spin-coating-coreduction approach synthesized Bi_2Te_3 topological insulators

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Photonics Research 2018年第4期6卷 314-320页

作者： JUNPENG QIAO SHENGZHI ZHAO KEJIAN YANG WEI-HENG SONG WENCHAO QIAO CHUNG-LUNG WU JIA ZHAO guiqiu li DECHUN li TAO li HONG liU CHAO-KUEI LEE School of Information Science and Engineering Shandong University Department of Photonics Taiwan Sun Yat-sen University State Key Laboratory of Crystal Materials Institute of Crystal Materials Shandong University Research Center for Applied Sciences Academia Sinica

In this paper, the fabrication process and characterization of Bi_2Te_3 topological insulators(TIs) synthesized by the spin-coating-coreduction approach(SCCA) is reported. With this approach, high-uniformity nano-crystalline TI saturable absorbers(TISAs) with large-area uniformity and controllable thickness are prepared. By employing these prepared TIs with different thicknesses as SAs in 2-μm solid-state Q-switched lasers, thickness-dependent output powers and pulse durations of the laser pulses are obtained, and the result also exhibits stability and reliability. The shortest pulse duration is as short as 233 ns, and the corresponding clock amplitude jitter is around 2.1%, which is the shortest pulse duration in Tl SA-based Q-switched 2-μm lasers to the best of our knowledge.Moreover, in comparison with the TISA synthesized by the ultrasound-assisted liquid phase exfoliation(UALPE)method, the experimental results show that lasers with SCCA synthesized TISAs have higher output powers, shorter pulse durations, and higher pulse peak powers. Our work suggests that the SCCA synthesized TISAs could be used as potential SAs in pulsed lasers.

关键词：拓扑绝缘体通讯技术发展现状激光器

liD设施布局对城市径流与污染负荷影响评估

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郑州大学学报（工学版） 2024年第4期45卷 87-94页

作者：窦明闫佳佳王偲关健李桂秋侯进进郑州大学生态与环境学院河南郑州450001 江苏省水文水资源勘测局南通分局江苏南通226006 河南省自然资源监测和国土整治院河南郑州450018 水利部长江水利委员会长江科学院湖北武汉430012

关于低影响开发(liD)空间布局对水量水质控制效果影响的研究较为缺乏。针对上述问题,以郑州市中原区为对象,基于SWMM模型原理构建布设liD设施的研究区城市水量水质模型。所提模型依据城市综合径流系数的经验值以及研究区实际情况,将中... 详细信息

关于低影响开发(liD)空间布局对水量水质控制效果影响的研究较为缺乏。针对上述问题,以郑州市中原区为对象,基于SWMM模型原理构建布设liD设施的研究区城市水量水质模型。所提模型依据城市综合径流系数的经验值以及研究区实际情况,将中原区划分为城市建筑高、中、低密集区,并在研究区高、中、低密集子汇水区布设不同比例的liD设施(S1~S5),计算不同雨量级别下不同空间格局下的liD设施对水量水质的控制效果。结果表明:随着雨量级别的增大,liD方案的径流总量削减率、峰值流量削减率和TSS负荷削减率不断减小。在降雨级别为暴雨、大雨和中雨时,在高、中、低密集子汇水区布设占比分别为35%、35%和30%的liD方案(S5),其径流总量削减率超过80%,峰值流量削减率超过70%,且TSS负荷削减率超过50%。从各事件下水量与水质综合指标评估来看,该方案表现最佳。

关键词： SWMM模型 liD设施空间布局径流总量削减率管段超载 TSS负荷削减率

Inhibiton of Hepatitis B virus cccDNA replication by siRNA

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Inhibiton of Hepatitis B virus cccDNA replication by siRNA

Phlorizin alleviates mastitis and preserves the blood-milk barrier by metabolizing into phloretin

第二届中国临床微生物学大会暨微生物学与免疫学三江论坛

作者： guiqiu li the First Clinical College of Harbin Medical University

The development of an effective therapy for Hepatitis B virus（HBV） infection is still a challenge.Progress in RNA interference（RNAi） has shed slight on developing a new anti-HBV strategy.Here we present a series of experiments showing a significant reduction in HBV transcripts and replication intermediates in HepG2.2.15 cells by vector-based siRNA targeted nuclear localization signal（NLS） region.More importantly,we showed that siRNAl markedly inhibited HBV covalently closed circular DNA（cccDNA） replication,Our results indicated that HBV NLS may be serves as a novel RNAi target to combat HBV infection,which can enhance anti-HBV efficacy and overcome the drawbacks of current therapies.

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Food Science and Human Wellness 2024年

作者： Xin Ran Kefei li Juxiong liu Xiaoxuan Wang Wenjin Guo guiqiu Hu Shoupeng Fu State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases Key Laboratory for Zoonosis Research of the Ministry of Education Institute of Zoonosis and College of Veterinary Medicine Jilin University

Mastitis is a common disease that affects women during lactation， posing a threat to the health of both mothers and infants. Recent studies have shown that insufficient nutrient intake increase the risk of mastitis. Phlorizin (PHZ) is one of the nutrients present in apples. This study uses lipopolysaccharide (LPS)-induced mastitis mice and LPS+ATP-stimulated mouse mammary epithelial cells (mMECs) as research objects to explore the effect and mechanism of PHZ on mastitis. Different to in vitro beliefs， our findings demonstrated that PHZ significantly reduced inflammation and protected the blood–milk barrier (BMB) in vivo. Additionally， we observed that oral administration of PHZ regulated the intestinal flora and exhibited prebiotic functions. However， the anti-inflammatory effect of PHZ was not solely dependent on the intestinal flora， as antibiotic disruption of the intestinal flora does not completely abolish the improvement of mastitis by PHZ. Further mechanistic research revealed that the anti-inflammatory properties of PHZ were attributed to its metabolism into phloretin (PHT). Moreover， our results demonstrated that PHT reduced inflammation and protected the BMB by promoting autophagy to prevent the pyroptosis of mMECs. This study provides a theoretical basis for reducing inflammation in lactating women by consuming fruits， such as apples， that contain PHZ.

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基于区间规划的沙颍河流域排污权交易方案优选

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水资源保护 2023年第3期39卷 126-133页

作者：窦明张森王艳艳李桂秋郑州大学水利科学与工程学院河南郑州450001 郑州大学生态与环境学院河南郑州450001 山脉科技股份有限公司陕西西安710075

针对排污权交易中水体纳污能力、排污负荷、保护目标等因素的变化使得排污权交易过程具有很大的不确定性的问题,引入区间规划理论寻求考虑这些不确定因素情况下的最优解。采用MIKE11模型模拟沙颍河水量和水质过程,得到不同来水情势下各... 详细信息

针对排污权交易中水体纳污能力、排污负荷、保护目标等因素的变化使得排污权交易过程具有很大的不确定性的问题,引入区间规划理论寻求考虑这些不确定因素情况下的最优解。采用MIKE11模型模拟沙颍河水量和水质过程,得到不同来水情势下各水功能区的纳污能力过程;应用环境容量模型进行初始排污权分配,提出基于区间规划的排污权交易模型和多目标优化求解方法,得到各计算单元在不同工况下的排污权交易区间值。结果表明,在优化后的排污权交易方案中,沙颍河流域经济效益增加582066万~1217602万元,剩余的环境容量为0~16948 t/a,水质达标率提升至85%~90%;经过区间规划优选出的方案,能体现排污权交易的不确定性因素,减少交易过程中各制约因素变化产生的影响。

关键词：排污权交易区间规划 MIKE11模型沙颍河