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Enhancement of potassium resistance of Ce-Ti oxide catalyst for NH_(3)-SCR reaction by modification with holmium

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Journal of Rare Earths 2022年第1期40卷 49-56页

作者： Chaopeng Duan Ruitang Guo Yuanzhen Liu Guilin Wu Yufang Miao Jingwen Gu Weiguo Pan School of Energy Source and Mechanical Engineering Shanghai University of Electric PowerShanghai 200090China Shanghai Engineering Research Center of Power Generation Environment Protection Shanghai 200090China

Alkali metal K in exhaust gas has a deactivation effect on NH_(3)-SCR catalysts.In this work,it is discovered that the addition of ho on CeTi catalyst can remarkably strengthen its K tolerance.The conclusions of Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),NH_(3) temperature programmed desorption(NH_(3)-TPD)and H_(2)temperature programmed reduction(H_(2)-TPR)analyses demonstrate that the enhancement of K resistance mainly originates from its stronger surface acidity and redox capability,the higher concentration of Ce^(3+)species and surface chemisorbed oxygen.In situ DRIFT analysis reveals that the introduction of ho on CeTi can remarkably improve the adsorption of NH_(3) and NO_(x) species on catalyst surface,accompanied by the intensified reactivity of ad-NH_(3) species,which should also administer to improve the K resistance.

关键词： NH_(3)-SCR ho Ce Ti oxide catalyst K resistance Rare earths

大行(DAhoN)2024年度全国代理商大会盛大开幕

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中国自行车 2024年第3期 4-4页

作者： DAhoN大行折叠车公众号

2024年3月20日,大行(DAhoN)2024年度全国代理商大会于海南三亚圆满结束。大会回顾总结了大行2023年度取得的傲人成绩,对2024年度技术新品、营销策略、渠道政策、战略目标等内容进行宣讲,表彰了上年度优秀代理商,还发起了愉悦畅快的试骑... 详细信息

2024年3月20日,大行(DAhoN)2024年度全国代理商大会于海南三亚圆满结束。大会回顾总结了大行2023年度取得的傲人成绩,对2024年度技术新品、营销策略、渠道政策、战略目标等内容进行宣讲,表彰了上年度优秀代理商,还发起了愉悦畅快的试骑活动。

关键词：全国代理商渠道政策营销策略海南三亚战略目标优秀代理商 DA ho

Is glial heme oxygenase-1 suppression in neurodegenerative disorders permissive for neural repair?

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Neural Regeneration Research 2015年第2期10卷 208-210页

作者： Hyman M. Schipper Bloomfield Centre for Research in Aging Lady Davis Institute for Medical Research Jewish General Hospital Department of Neurology &Neurosurgery and Department. of Medicine Mc Gill University

＇Core＇ neuropathology of degenerative central nervous system （CNS） disorders The common human neurodegenerative disorders （Alzheimer＇s disease （AD）, Parkinson＇s disease （PD）, amyotrophic lateral sclerosis, etc.） vary with respect to risk factors, ages of onset, sex predilections, neuraxial regions affected, hallmark cellular inclusions, behavioral and neurological symptoms, and responses to treatment. Despite these differences, there appears to be a set of ＇core＇ neuropathological features shared among these and related entities. Common to these conditions are 1） pathological deposition of non-transferrin bound iron, 2） oxidative stress and associated protein, lipid and nucleic acid modifications, 3） mitochondrial membrane damage and bioenergetic failure, and 4） macroautophagy in the affected neural tissues.

关键词： gene ho Is glial heme oxygenase-1 suppression in neurodegenerative disorders permissive for neural repair GFAP

Widely Tunable Middle Infrared Optical Parametric Oscillator Pumped by the Q-Switched ho：GdVO_4 Laser

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Chinese Physics Letters 2018年第5期35卷 48-51页

作者：段小明陈成丁宇姚宝权王月珠 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin 150001 Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308

We demonstrate a middle infrared ZnGeP_2 optical parametric oscillator pumped by the Q-switched ho：GdVO_4 laser. When the incident ho pump power is 4.12 W, the maximum average output power of the ZGP-OPO laser is 2.05 W, corresponding to a slope efficiency of 74.6%. The ZGP-OPO laser produces 4.2 ns mid-infrared pulses at a pulse repetition rate of 5 kHz. In addition, we obtain 0.8 um of tunable range for the signal wave and 2.1 um of tunable range for the idler wave.

关键词： ho OPO Widely Tunable Middle Infrared Optical Parametric Oscillator Pumped by the Q-Switched ho:GdVO4 Laser

Passively Q-Switched ho:SSO Laser by Use of a Cr2+:ZnSe Saturable Absorber

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Chinese Physics Letters 2017年第2期34卷 27-29页

作者：杨晓涛刘龙谢文强 College of Power and Energy Engineering Harbin Engineering UniversityHarbin 150001

A cw operation and a passively Q-switched （PQS） ho：SSO laser （Cr2＋：ZnSe as a saturable absorber） end-pumped by a TIn：YAP laser operating at near room temperature are reported. It is the first time to report a PQS ho：SSO laser. For the ew mode, a maximum cw output power of 3.0 W is obtMned, corresponding to a slope efficiency of 31.4%. For the PQS mode, a Cr2＋：ZnSe is used as the saturable absorber, with transmission of 88.4% at 2112nm. A maximum pulse energy of 1.29mJ is obtained, corresponding to the pulse repetition frequency of 2.42kHz. In this study, we change the distance between Cr2＋：ZnSe and the output mirror to research the pulse characteristic of the PQ, S ho：SSO laser. The minimum pulse width of 73.5ns is obtained, corresponding to the pulse energy of O. 9 mJ and the pulse repetition frequency of 2.65 kHz.

关键词： ho ZnSe Saturable Absorber Passively Q-Switched ho:SSO Laser by Use of a Cr SSO

An Actively Mode-Locked ho:YAG Solid-Laser Pumped by a Tm-Doped Fiber Laser

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Chinese Physics Letters 2016年第4期33卷 44-47页

作者：姚宝权李贺李晓磊陈毅段小明白爽杨宏宇崔铮申英杰戴通宇 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology

An actively mode-locked ho： YAG laser pumped by a diode-pumped Tin-doped fiber laser is reported. For the cw operation, we obtain the maximum output power of 3.43 W with a central wavelength 2022.2nm at the maximum incident pump power of 11.4 W, corresponding to a slope efficiency of 34.5%. The beam quality factor M2 is 1.16, and the output beam is close to fundamental TEMoo. In the case of the CWML operation, a stable pulse train is generated with an average output power up to 3.41 W with a slope efficiency of 34.3% at the incident pump power of 11.4 W and a pulse duration of 294ps at a repetition rate of 81.92MHz. In addition, the maximum single pulse energy is 41.6nJ.

关键词： YAG in ho An Actively Mode-Locked ho:YAG Solid-Laser Pumped by a Tm-Doped Fiber Laser of by Tm

Development of a Single-Longitudinal-Mode ho:YAG Laser Based on Corner Cube

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Chinese Physics Letters 2016年第4期33卷 36-39页

作者：吴婧鞠有伦戴通宇张振国姚宝权王月珠 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology

We present a Tm-doped fiber laser pumped Fabry-Perot etalons ho：YAG laser based on a corner cube. A maximum single-longitudinal-mode and fundamental transverse mode output power of 478 m W at the wavelength of 2091.06 nm is achieved with a pump power of 16.3 W, corresponding to an optical-to-optical efficiency of 2.9% and a slope efficiency of 7.9%. The single-longitudinal-mode and fundamental transverse mode are less sensitive to the rotating of the corner cube. The results indicate the potential impact of a single-longitudinal-mode ho： YA G laser with corner cube geometry to improve the anti-maladjustment stability.

关键词： YAG as of ho Development of a Single-Longitudinal-Mode ho:YAG Laser Based on Corner Cube on

Enhanced 1-5 μm near-and mid-infrared emission in ho3+/Yb3+codoped TeO2-ZnF2 oxyfluorotellurite glasses

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Journal of Rare Earths 2020年第10期38卷 1044-1052页

作者： Yu Wang Changfu Xu Zhen Zhang Cheng Zheng Jintao Pei Lizhong Sun Hunan Provincial Key Laboratory of Thin Film Materials and Devices School of Materials Science and EngineeringXiangtan University

Intense 1-5 μm infrared emission from near-to mid-infrared was obtained from ho+/Ybcodoped TeO-ZnFoxyfluorotellurite glasses which were prepared by melt-quenching method under the 980 nm LD excitation,and the emission intensity can be enhanced with the increase of ZnFcontent.Judd-Ofelt analysis was used to evaluate the radiative transition parameters of the excited levels according to the absorption spectra.The stimulated emission cross section of ~5 I6→~5 I(1.2 μm),~5 I7→~5 I(2.0μm),~5 I→~5 I(2.85 μm) and ~5 I→~5 I(4.0 μm) transitions were calculated to reach 0.639 × 10,0.760 ×10,0.985×10 20 and 0.484 × 10cm~2,respectively.The energy transfer coefficients(C) are enhanced with the increase of ZnF2 content and phonon contribution ratios of phonon assisted energy transfer process between hoand Ybwere figured out.Our results demonstrate that these TeO-ZnFglasses,which possess good thermal stability and transparency,low phonon energy(about 600 cm),excellent near-and mid-infrared emission in the range of 1-5 μm wavelength,would be promising material for infrared optical fibers and infrared lasers.

关键词： TeO 2 -ZnF 2 glass ho 3+ /Yb 3+ codoped Energy transfer 1–5 μm near- and mid-infrared Rare earths

High-power, high-energy ho:YAG oscillator pumped by a Tm-doped fiber laser

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Chinese Optics Letters 2015年第12期13卷 36-40页

作者：吉恩才柳强胡震岳闫平巩马理 Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and InstrumentsCenter for Photonics and ElectronicsTsinghua University

high-power, high-energy ho：YAG oscillator resonantly pumped by a Tm-doped fiber laser is presented. A maximum continuous output power of 38 W with a slope efficiency of 51.9% is achieved at the wavelength of 2.09 μm, and M2≈1.48. In the Q-switching regime, the maximum pulse energy of 12.8 mJ, corresponding to a 514.5 kW peak power, is obtained at the pulse repetition frequency of 1 kHz. Furthermore, the thermal lens effect of the system is studied theoretically, and the radius of the transverse electromagnetic（TEM_（00）） mode of the laser crystal under different pump powers is given.

关键词： YAG ho High-power high-energy ho Tm