1,498 research outputs found
Nd-doped polarization maintaining all-fiber laser with dissipative soliton resonance mode-locking at 905 nm
No full textFunding Information: Manuscript received February 15, 2021; revised May 14, 2021; accepted May 27, 2021. Date of publication June 1, 2021; date of current version September 13, 2021. This work was supported by RFBR under Grant 20-32-90233. (Corresponding author: Aram A. Mkrtchyan.) Aram A. Mkrtchyan, Yuriy G. Gladush, and Kirill A. Sitnik are with the Skolkovo Institute of Science and Technology, Moscow 121205, Russia (e-mail: [email protected]; [email protected]; [email protected]). Publisher Copyright: © 1983-2012 IEEE.Moving the fiber laser emission to the region below one micron may provide a cheaper, more compact and robust alternatives to the existing solid state lasers. Here, for the first time we report a neodymium mode-locked fiber laser emitting at 905 nm in the all-fiber polarization maintaining configuration. We obtain a self-starting pulse generation in nonlinear amplifying loop mirror (NALM) cavity configuration. To suppress a dominant emission at 1064 nm corresponding to a 4-level laser scheme, we use an active fiber - 920/1064 division multiplexer - active fiber sandwich-like sequence in the NALM loop. A rectangular shape dissipative soliton had nJ energy, 30 pm spectral width and 80 ÷ 430 ps width linearly depending on the pump power. Excellent agreement with numerical simulation allowed us to recover pulse shape and width for the pulses out of autocorrelation window.Peer reviewe
The European Union and the South Caucasus; Three Perspectives on the Future of the European Project from the Caucasus. Europe in Dialogue 2009/1
No full textTigran Mkrtchyan singles out three main factors that determine Armenia’s rather positive attitude to and interest in EU policies in the Caucasus region. Firstly, further cooperation with the EU could guarantee a democratically stable future for the country. Secondly, Armenia would benefit from increased economic cooperation with the EU. Thirdly, to a large extent the population feels that it belongs to Europe. However, some critics, mostly from the ranks of the intelligentsia, have expressed concern that too much Europeanization constitutes a threat to national identity.///// Tabib Huseynov agrees with Mkrtchyan in calling for a more active EU role in the region and most notably in the resolution of the Nagorno-Karabakh conflict. This would lay the foundations for the ongoing development of the region. Huseynov outlines factors contributing to or impeding regional cooperation in the South Caucasus and cooperation between the EU and Azerbaijan. Whereas Georgia and Armenia are seeking EU membership in the long term and financial assistance in some areas, Azerbaijan remains financially independent on account of its oil revenues and is not interested in EU membership in the near future. It is far more interested in increased economic and trade cooperation./// Kakha Gogolashvili, Director of EU Studies at the Georgian Foundation for Strategic and International Studies (GFSIS), describes the level of acceptance for EU policies in Georgia. To a large extent the general goals of Georgian policy-makers are aligned with those of the EU, and this facilitates cooperation in implementing reforms in the country
Algorithmic bias in social research: A meta-analysis
No full textReplication material for Thiem, A., L. Mkrtchyan, T. Haesebrouck and D. Sanchez. 2020. "Algorithmic bias in social research: A meta-analysis." PLoS ONE 15(6): e0233625. DOI: 10.1371/journal.pone.023362
ARDD 2020: from aging mechanisms to interventions
No full textAging is emerging as a druggable target with growing interest from academia, industry and investors. New technologies such as artificial intelligence and advanced screening techniques, as well as a strong influence from the industry sector may lead to novel discoveries to treat age-related diseases. The present review summarizes presentations from the 7th Annual Aging Research and Drug Discovery (ARDD) meeting, held online on the 1st to 4th of September 2020. The meeting covered topics related to new methodologies to study aging, knowledge about basic mechanisms of longevity, latest interventional strategies to target the aging process as well as discussions about the impact of aging research on society and economy. More than 2000 participants and 65 speakers joined the meeting and we already look forward to an even larger meeting next year. Please mark your calendars for the 8th ARDD meeting that is scheduled for the 31st of August to 3rd of September, 2021, at Columbia University, USA. © 2020. Mkrtchyan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. All Rights Reserved
Predicting the Corn Basis in the Texas Triangle Area
No full textShifting patterns of corn use as a result of the ethanol boom may be causing basis levels to change across the United States, creating the need for methods to predict basis levels in dynamic conditions. This study develops a new and straightforward economic model of basis forecasting that outperforms the simple three-year average method suggested in much of the literature. We use monthly data of the corn basis in the Texas Triangle Area from February 1997 to July 2008. The results show the new model based on economic fundamentals performs better than basis estimates using a three-year moving average.basis, corn, grain marketing, Texas Triangle Area, Agribusiness, Marketing,
Behavioral modeling of GaN-based power amplifiers: impact of electrothermal feedback on the model accuracy and identification
No full textIn this article, we discuss the accuracy of behavioral models in simulating the intermodulation distortion (IMD) of microwave GaN-based high-power amplifiers in the presence of strong electrothermal (ET) feedback. Exploiting an accurate self-consistent ET model derived from measurements and thermal finite-element method simulations, we show that behavioral models are able to yield accurate results, provided that the model identification is carried out with signals with wide bandwidth and large dynamics
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