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Keep Calm and Carry On

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英语世界 2019年第2期 127-128页

作者： jon Porter

‘Keep calm and carry on’*** can see this message written on many T-shirts and other tourist souvenirs in London and the *** has become so famous that there are many versions of it:‘keep calm and drink tea’;‘keep calm and love dogs’;‘keep calm and learn English’.As you can see,you can substitute the‘carry on’part for anything you want,really!

关键词： Activity Keep Calm and Carry On

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美国社会聚焦:波士顿的新名声

英语学习 2004年第10期 18-19页

作者： jon Lu

If you know something about American history,you would know that the city of Boston,in thestate of Massachusetts in the Northeasterncomer of the United States,figures prominently init,particularly in the colonial *** ... 详细信息

关键词：波士顿

Modular Multilevel Inverter with Maximum Power Point Tracking for Grid Connected Photovoltaic Application

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Journal of Energy and Power Engineering 2012年第10期6卷 1680-1687页

作者： Bader Naser Alajmi Khaled Hani Ahmed Grain Philip Adam Stephen jon Finney Barry WayneWilliams Department of Electronic and Electrical Engineering Strathclyde University Glasgow G1 1XW UK School of Engineering University of Aberdeen Aberdeen AB24 3UE UK

A single-phase modular multilevel inverter based photovoltaic system for grid connection is proposed. This photovoltaic system utilizes two conversion stages： a boost converter for tracking the maximum power point and a modular multilevel inverter used as an interfacing unit. The maximum power point tracking is achieved with a fuzzy logic controller, and the modular multilevel inverter regulates the DC link voltage and synchronizes the grid voltage and current in order to achieve unity power factor operation. The proposed system provides high dynamic performance and power quality injected into the grid. The validity of the proposed system is confirmed by simulations.

关键词： Photovoltaic boost converter multilevel inverter maximum power point tracker.

纳米氧化铝微柱富集-等离子体发射光谱法测定植物中痕量稀土元素

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分析化学 2005年第2期33卷 207-210页

作者：全光日普旭力江祖成胡斌武汉大学化学系武汉大学化学系武汉430072

以负载了1 苯基 3 甲基 4 苯甲酰基吡唑酮[5](PMBP)的纳米氧化铝为微柱吸附材料,采用等离子体原子发射光谱法(ICP AES),系统地研究了其在动态条件下对稀土离子Sc3+、Y3+和La3+的吸附性能,并确定了最佳吸附及解脱条件。实验结果表... 详细信息

以负载了1 苯基 3 甲基 4 苯甲酰基吡唑酮[5](PMBP)的纳米氧化铝为微柱吸附材料,采用等离子体原子发射光谱法(ICP AES),系统地研究了其在动态条件下对稀土离子Sc3+、Y3+和La3+的吸附性能,并确定了最佳吸附及解脱条件。实验结果表明:在pH为4.5时,分析物均可被上述吸附材料定量吸附;用0.5 mol/L盐酸溶液可将吸附在微柱上的稀土离子完全解脱。本法对Sc3+、Y3+和La3+的检出限分别为0.16、 0.19和0.39μg/L;相对标准偏差(RSD)分别为2.7%、3.2%和1.6%(n=9,C=0.5mg/L)。方法应用于植物标样中痕量Sc、Y和La的测定,其测定值与标样值吻合很好。

关键词：纳米氧化铝稀土离子等离子体原子发射光谱法 1-苯基-3-甲基-4-苯甲酰基-吡唑酮

High-repetition-rate source of nanosecond duration kA-current pulses driven by relativistic laser pulses

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High Power Laser Science and Engineering 2024年第3期12卷 106-115页

作者： Michael Ehret Jakub Cikhardt Philip Wykeham Bradford Iuliana-Mariana Vladisavlevici Tomas Burian Diego de Luis Jose Luis Henares Rubén Hernández Martín jon Imanol Apiñaniz Roberto Lera JoséAntonio Pérez-Hernández João Jorge Santos Giancarlo Gatti Centro de Láseres Pulsados(CLPU) VillamayorSpain Czech Technical University in Prague Faculty of Electrical EngineeringPragueCzech Republic Univ.Bordeaux-CNRS-CEA Centre Lasers Intenses et Applications(CELIA)UMR 5107TalenceFrance Department of Radiation and Chemical Physics FZU-Institute of Physics of the Czech Academy of SciencesPragueCzech Republic

We report the first high-repetition-rate generation and simultaneous characterization of nanosecond-scale return currents of kA-magnitude issued by the polarization of a target irradiated with a PW-class high-repetition-rate titanium:sapphire laser system at relativistic *** present experimental results obtained with the VEGA-3 laser at intensities from5×10^(18)to 1.3×10^(20)W cm^(-2).A non-invasive inductive return-current monitor is adopted to measure the derivative of return currents of the order of kA ns-1and analysis methodology is developed to derive return *** compare the current for copper,aluminium and Kapton targets at different laser *** data show the stable production of current peaks and clear prospects for the tailoring of the pulse shape,which is promising for future applications in highenergy-density science,for example,electromagnetic interference stress tests,high-voltage pulse response measurements and charged particle beam *** compare the target discharge of the order of hundreds of nC with theoretical predictions and a good agreement is found.

关键词： current pulses electromagnetic pulse application high-power laser relativistic laser plasma

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