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Recent advances in laser self-injection locking to high-Q microresonators

Frontiers of physics 2023年第2期18卷 89-130页

作者： Nikita m.Kondratiev Valery E.Lobanov Artem E.Shitikov Ramzil R.Galiev Dmitry A.Chermoshentsev Nikita Yu.Dmitriev Andrey N.Danilin Evgeny A.Lonshakov Kirill N.min’kov Daria m.Sokol Steevy J.Cordette Yi-Han Luo Wei Liang Junqiu Liu Igor A.Bilenko Directed Energy Research Centre Technology Innovation InstituteAbu DhabiUnited Arab Emirates Russian Quantum Center MoscowRussia Skolkovo Institute of Science and Technology SkolkovoRussia moscow Institute of Physics and Technology DolgoprudnyMoscow RegionRussia Faculty of Physics Lomonosov Moscow State UniversityMoscowRussia Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

The stabilization and manipulation of laser frequency by means of an external cavity are nearly ubiquitously used in fundamental research and laser applications. While most of the laser light transmits through the cavity, in the presence of some back-scattered light from the cavity to the laser, the self-injection locking effect can take place, which locks the laser emission frequency to the cavity mode of similar frequency. The self-injection locking leads to dramatic reduction of laser linewidth and noise. Using this approach, a common semiconductor laser locked to an ultrahigh-Q microresonator can obtain sub-Hertz linewidth, on par with state-of-the-art fiber lasers. Therefore it paves the way to manufacture high-performance semiconductor lasers with reduced footprint and cost. moreover, with high laser power, the optical nonlinearity of the microresonator drastically changes the laser dynamics, offering routes for simultaneous pulse and frequency comb generation in the same microresonator. Particularly, integrated photonics technology, enabling components fabricated via semiconductor CmOS process, has brought increasing and extending interest to laser manufacturing using this method. In this article, we present a comprehensive tutorial on analytical and numerical methods of laser self-injection locking, as well a review of most recent theoretical and experimental achievements.

关键词： self-injection locking laser stabilization microresonator nonlinearity single-frequency lasing multi-frequency lasing

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乙烷氧化脱氢用Ni/Al_2O_3催化剂中活性镍物种前驱体(英文)

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催化学报 2013年第10期34卷 1905-1913页

作者： Lucie Smoláková árka Botková Libor apek Peter Priecel Agnieszka Soltysek martin Kout Lenka matějová Department of Physical Chemistry Faculty of Chemical TechnologyUniversity of Pardubice Nanotechnology Centre V B-Technical University of Ostrava

Ni/Al2O3 catalysts for oxidative dehydrogenation(ODH) of ethane were prepared by impregnation of Al2O3 with nickel acetate or nickel nitrate,and by mechanical mixing of NiO and *** Ni-based catalysts were characterized by N2 adsorption-desorption,X-ray diffraction,diffuse reflectance UV-visible diffuse reflectance spectroscopy,and temperature-programmed reduction of *** results showed that formation of crystalline NiO particles with a size of m and/or non-stoichiometric NiO species in the Ni/Al2O3 catalysts led to more active species in ODH of ethane under the investigated reaction *** contrast,tetrahedral Ni species present in the catalysts led to higher selectivity for *** of large crystalline NiO particles(22-32 nm) over Ni/Al2O3 catalysts decreased the selectivity for ethene.

关键词： Alumina Ethane Oxidative dehydrogenation Nickel species

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Weyl Group Orbit Functions in Image Processing

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Applied mathematics 2014年第3期5卷 501-511页

作者： Goce Chadzitaskos Lenka Háková Ondrej Kajínek Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic

We deal with the Fourier-like analysis of functions on discrete grids in two-dimensional simplexes using C- and E-Weyl group orbit functions. For these cases, we present the convolution theorem. We provide an example of application of image processing using the C-functions and the convolutions for spatial filtering of the treated image.

关键词： Orbit Functions Convolution Image Processing

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Current State and Development of the Soil Health Index in Localities with Various Soil-Climatic Conditions in the Slovak Republic

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Journal of Geoscience and Environment Protection 2022年第6期10卷 1-11页

作者： Jarmila makovníková Boris Pálka Stanislav Kološta National Agricultural and Food Centre/Soil Science and Conservation Research Institute Bratislava Regional Station Banská Bystica Slovakia Faculty of Ecomonics Matej Bel University Banská Bystrica Slovakia

The aim of the study was to assess the current state and development of the Soil Health Index (SHI) at 13 localities with various soil-ecological conditions in the Slovak Republic. The SHI was developed using a minimum soil data set, physical and chemical soil parameters in combination with environmental parameters (land use, gradients). The SHI is one numerical value accumulates information about the state of soil health and its ability to provide soil functions and thus ecosystems in the optimal range. The highest SHI values were determined at model localities used as arable land (Haplic Chernozem, Fluvisol) located in a warm climate at altitudes up to 200 meters above sea level. Ecosystems with very low and low value are mostly grasslands with mildly cold climate (Cambisol) and considerable slope, agroecosystem on low organic matter (Arenosol). Arable ecosystem SHI is also reduced in areas of geochemical anomalies and areas with anthropogenic load, where there is a higher content of risk elements. The SHI changes are mainly the result of changes in dynamic indicators such as soil response and soil bulk density.

关键词： Soil Health Agroecosystem Services Soil Parameters minimum Soil Data Set

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Green synthesis of Ag nanoparticles: Effect of algae life cycle on Ag nanoparticle production and long-term stability

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Transactions of Nonferrous metals Society of China 2018年第5期28卷 974-979页

作者： Oksana VELGOSOVA Anna mRAZIkovA Elena CIZmAROVA Jaroslav mALEK Institute of materials and Quality Engineering Faculty of Materials Metallurgy and Recycling Technical University of Kosice Letnfi 9/A 040 01 Kosice Slovakia Republic Department of materials Engineering Faculty of Mechanical EngineeringCzech Technical University in Prague Karlovo nam. 13 121 32 Prague 2 Czech Republic

Spherical Ag nanoparticles（AgNPs） were biologically synthesized using four different extracts prepared from Parachlorella kessleri algae cultivated for 1, 2, 3 and 4 weeks. The influence of algae life cycle on AgNPs formation and effect of different storage conditions on AgNPs long-term stability were investigated. The age of algae influenced the rate of AgNPs synthesis and amount of AgNPs in solution. The age of algae did not influence the AgNPs long-term stability. UV–vis and TEm observation revealed that long-term stability of AgNPs can be influenced by storage temperatures, and low temperature positively influences the AgNPs stability. AgNPs stored at dark and at temperature of ~5 °C showed the best long-term stability regardless of the culture age. Such AgNPs remained spherical, fine（5-20 nm） and stable（no agglomeration） even after 6 months.

关键词： Ag nanoparticles stability Parachlorella kessleri

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The Image of Primary School Teachers from the View of Pupils’

The Image of Primary School Teachers from the View of Pupils...

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2012 2nd International Conference on Social Sciences and Society(ICSSS 2012)

作者： martin Skutil Hana Holeková Institute of Primary and Pre-primary Education Faculty of Education University of Hradec Králové

The personality of the teacher is an indispensable part in the educational process. A teacher leads student learning activities and influences them educationally. The main task of a teacher is to lead a pupil towards the self-development of their own potential. This development is also influenced by the relationship between student and teacher and their views on the profession. The paper presents results of a research survey, which was implemented on the basis of a questionnaire among pupils of the first, third and fifth grades. The primary objective was to determine how children perceive their teachers and what features pupils expect from them. The secondary objective was to determine the behaviour of teachers during lessons and the actual relationship of a teacher to a pupil.

关键词： Primary education teacher in education teaching profession the views of children in school.

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The concept of self-consistent field applied to the inviscid suspensions

The concept of self-consistent field applied to the inviscid...

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23rd International Congress of Theoretical and Applied mechanics

作者： Oleg B.Gus’kov Institute of Applied mechanics Russin Academy of SciencesMoscowRussia

＜正＞The concept of self-consistent field,well known in physics,is applied to the problem of hydrodynamic interaction of spherical par- ticles in inviscid potential *** classic boundary-value problem is reduced to the determination of the tensor coefficients in the resulting exact solution for N particles in a liquid,based on an infinite linear algebraic system of *** procedure of the approximate solving of this system is constructed for the case

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Only mothers feed mature offspring in European Ceratina bees

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Insect Science 2021年第5期28卷 1468-1481页

作者： michael mikat Jitka Waldhauserova Tereza Frankova Katerina Cermakova Vojtech Broz Simon Zeman marcela Dokulilova Jakub Straka Department of Zoology Faculty of ScienceCharles UniversityPragueCzech Republic Jihlava Grammar School JihlavaCzech Republic Department of Ecology Faculty of ScienceCharles UniversityPragueCzech Republic

Parental care directed to adult offspring is uncommon in *** parental care has been documented in Xylocopinae bees(Hymenoptera:Apidae).moreover,some Ceratina bees(Xylocopinae)are known to feed mature siblings,and feeding of mature siblings is achieved by dwarf eldest daughters when mothers *** daughters are intentionally malnourished by mothers and usually originate from the first brood ***,we examined the pattern of care prov ided to young adults in three small European carpenter bees:Ceratina(Ceratina)cucurbitina,C.(Euceratina)chalybea,and C.(E.)*** of nest departures and arrivals were performed to study foraging *** detected intensive foraging behavior of mothers in all three studied ***,we did not observe regular foraging bchavior of daughters in any *** experimental removal of mothers in *** led to the emigration of young adults and did not initiate foraging activity in *** conclude that the feeding of siblings does not occur in these species unlike in the American species *** detected female-biased sex ratios in the first brood cell in *** and *** offspring in the first brood cell was smaller than other female offspring only in *** results show that a female-biased sex ratio and the small size of daughters in the first brood cell do not provide sufficient ev idence for demonstrating the existence of an altruistic daughter and also that the pattern of maternal investment is not exclusively shaped by social interactions.

关键词： foraging trip Hymenoptera maternal care provisioning sociality Xylocopinae

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人工神经元网络法提高毛细管电泳药物控制分析准确度的研究

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化学学报 2002年第7期60卷 1264-1268页

作者：李华张雅雄 Polkov pavla Havel Josef 西北大学分析科学研究所西安710069 masaryk大学分析化学系 kotlsk261137

研究了人工神经元网络法在毛细管电泳定量测定memantine中提高测定准确度的可行性 .在毛细管电泳法定量测定memantine的过程中 ,其浓度与峰高或峰面积以及与二者和内标的比值均没有良好的线性关系 .人工神经元网络具有很强的非线性校正... 详细信息

研究了人工神经元网络法在毛细管电泳定量测定memantine中提高测定准确度的可行性 .在毛细管电泳法定量测定memantine的过程中 ,其浓度与峰高或峰面积以及与二者和内标的比值均没有良好的线性关系 .人工神经元网络具有很强的非线性校正能力 ,其最大优点是无须对分离体系及组分的迁移行为预先予以了解 .人工神经元网络的输入为memantine的峰高和峰面积 ,输出为memantine的浓度 .通过实验确定的网络结构为 2∶2∶1型 .由于人工神经元网络的通用性。

关键词：药物控制分析准确度人工神经元网络毛细管电泳 memantine 定量分析

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Impact of Fast-Growing Trees Planting on Degraded Land from Perspectives of Ecosystem Services—Case Study from Slovakia

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Journal of Geoscience and Environment Protection 2022年第11期10卷 140-150页

The aim of the study was to assess the effect of natural phytoremediation, impact of growing fast-growing trees on contaminated agricultural land on ecosystem services using a matrix evaluation system. The matrix system is a table that links an ecosystem to its potential to provide ecosystem services. To determine the monetary price of natural capital for the provision of ecosystem services, we chose the value transfer method, based on which it is possible to assign a price (1 point = 40.7 EUR) to point values. monitoring of the study site Kuchyňa (mollic Fluvisol) is running since year 2010. The fast-growing willow was planted (between 2006 to 2018 year) on an area of about 43 hectares. During the monitoring of soil parameters, we observed a slight decrease in the value of the active soil reaction, a negative trend in the content of available phosphorus and a positive trend in the development of the total content risk elements in the soil. The phytoremediation ability of willow regarding risk elements was manifested by an increase in the value and price of production and regulatory ecosystem services at the monitored location. The price of natural phytoremediation of fast-growing willow on the given area was 218762.5 EUR for production services and 171509.8 EUR for regulatory services.

关键词： Ecosystem Services Soil Parameters Fast Growing Trees

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