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第9章边界层气象学100年进步

气象科技进展 2019年第S1期9卷 123-143页

作者：玛格丽特·雷蒙 WAYNE M.ANGEVINE CHRISTOPHER S.BRETHERTON FEI CHEN JIMY DUDHIA evgeni fedorovich KRISTINA B.KATSAROS DONALD H.LENSCHOW LARRY MAHRT EDWARD G.PATTON JIELUN SUN MICHAEL TJERNSTR?M JEFFREY WEIL 李婧华贾朋群 NCAR 美国科罗拉多大学 NOAA ESRL 美国华盛顿大学美国俄克拉何马大学美国西北研究协会瑞典斯德哥尔摩大学

在过去的100年里,边界层气象学从以近地面观测为主的学科,发展为涵盖全球各种大气边界层(ABL)的领域。从一开始,研究人员就从不断扩展的学科--热力学、土壤和植物研究、流体动力学和湍流、云微物理学和气溶胶等汲取经验。为了研究颗粒... 详细信息

在过去的100年里,边界层气象学从以近地面观测为主的学科,发展为涵盖全球各种大气边界层(ABL)的领域。从一开始,研究人员就从不断扩展的学科--热力学、土壤和植物研究、流体动力学和湍流、云微物理学和气溶胶等汲取经验。为了研究颗粒物和痕量气体的扩散,研究范围向上扩大到包括整个ABL,之后研究延伸到在数值天气气候模式表征ABL(从1970-1980年代开始),并利用其他领域的发展带来的机会,包括大涡模拟(1970年代)、直接数值模拟(1990年代)和从地面、大气和空间中对边界层进行外场和远程采样的仪器。1940-1970年代,近地面通量廓线关系研究迅速发展,当时迅速发展的领域转向了晴朗天气对流边界层(CBL),尽管热带CBL研究可以追溯到1940年代。1980年代,ABL研究开始包括ABL与地面和云的相互作用,并出现了第一个ABL参数化方案;陆面和海面模式也蓬勃发展。随后几十年中,研究侧重于因天气气候模式的缺陷或不确定性而发现的更为复杂的ABL,包括稳定边界层、北极边界层、阴天边界层和非均匀地面(包括城市)上的ABL。最后进行了简要概述,总结了一些经验教训,并展望了未来。

关键词：天气气候对流边界层直接数值模拟痕量气体流体动力学稳定边界层参数化方案经验教训

Structure of serotonin receptors:molecular underpinning of receptor activation and modulation

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Signal Transduction and Targeted Therapy 2021年第7期6卷 1950-1952页

作者： Markus Zweckstetter Alexander Dityatev evgeni Ponimaskin Translational Structural Biology Group German Center for Neurodegenerative Diseases(DZNE)GottingenGermany Department for NMR-based Structural Biology Max Planck Institute for Biophysical ChemistryGottingenGermany Molecular Neuroplasticity Group German Center for Neurodegenerative Diseases(DZNE)MagdeburgGermany Medical Faculty Otto-von-Guericke UniversityMagdeburgGermany Center for Behavioral Brain Sciences(CBBS) MagdeburgGermany Department of Cellular Neurophysiology Hannover Medical SchoolHannoverGermany

The structural basis of the regulation of serotonin(5-hydroxy-tryptamine,5-HT)receptors by ligands and lipids is only emerging.A recent study by Xu and colleagues1 published in Nature addresses this issue by resolving five structures of 5-HT;receptor-G protein *** include 5-HT1A in the apostate,*** bound to a ligand,5-HT1A and 5-HT1D bound to serotonin or the atypical antipsychotic aripiprazole(for 5-HT1A),and 5-HT1E bound to its selective agonist BRL-54443.

关键词： serotonin lipids atypical

Study of the Long-term BVR_(c)I_(c) Photometric Variability of Eight PMS Stars in the Young Open Cluster Trumpler 37

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Research in Astronomy and Astrophysics 2023年第8期23卷 117-126页

作者： Sunay Ibryamov Gabriela Zidarova evgeni Semkov Stoyanka Peneva Department of Physics and Astronomy Faculty of Natural SciencesUniversity of Shumen115Universitetska Str.9700 ShumenBulgaria Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72Tsarigradsko Shose Blvd.1784 SofiaBulgaria

This paper reports results from our long-term BV(RI)_(c) photometric CCD observations of eight pre-main sequence stars collected from 2008 June to 2022 *** stars are located in the young open cluster Trumpler 37,in the field of GM *** observational data indicate that all stars from our study exhibit variability in all-optical passbands,typical for young *** this paper,we describe and discuss the photometric behavior of the stars and the possible reasons for their *** two of the objects,we identified periodicity in their light variation.

关键词： stars pre-main sequence-stars variables T Tauri-Herbig Ae/Be

A long-term UBVRI photometric study of the pre-main sequence star V350 Cep

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Research in Astronomy and Astrophysics 2014年第10期14卷 1264-1268页

作者： Sunay Ibryamov evgeni Semkov Stoyanka Peneva Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72 Tsarigradsko Shose Blvd1784 SofiaBulgaria

Results from UBVRI optical photometric observations of the pre-main se- quence star V350 Cep during the period 2004-2014 are presented. The star was dis- covered in 1977 due to its remarkable increase in brightness by more than 5 mag （R）. In previous studies, V350 Cep was considered to be a potential FUor or EXor eruptive variable. Our data suggest that during the period of observations the star maintains its maximum brightness with low amplitude photometric variations. Our conclusion is that V350 Cep was probably an intermediate object between FUors and EXors, similar to V1647 Ori.

关键词： stars pre-main sequence -- stars variable T Tauri -- stars individual(V350 Cep)

Long-term V(RI) CCD photometry of pre-main-sequence stars in the association Cepheus OB3

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Research in Astronomy and Astrophysics 2021年第8期21卷 91-98页

作者： Sunay Ibryamov Gabriela Zidarova evgeni Semkov Stoyanka Peneva Department of Physics and Astronomy University of Shumen115Universitetska Str.9700 ShumenBulgaria Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72Tsarigradsko Shose Blvd.1784 SofiaBulgaria

Results from optical CCD photometric observations of 13 pre-main-sequence stars collected during the period from February 2007 to November 2020 are *** stars are located in the association Cepheus OB3,in the field of the young star V733 *** observations,especially concerning the long-term variability of the stars,are missing in the *** present the first longterm V(RI)c monitoring for them,that cover 13 *** from our study indicate that all of the investigated stars manifest strong photometric *** presented paper is a part of our program for the photometric study of pre-main-sequence stars located in active star-forming regions.

关键词： stars:pre-main sequence stars:variables:T Tauri Herbig Ae/Be techniques:photometric methods:observational data analysis stars:individual

Long-term Photometric Study of the Pre-main Sequence Star V1180 Cas

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Research in Astronomy and Astrophysics 2022年第12期22卷 284-291页

作者： Asen Mutafov evgeni Semkov Stoyanka Peneva Sunay Ibryamov Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of SciencesBG-1784SofiaBulgaria Department of Physics and Astronomy Faculty of Natural SciencesUniversity of Shumen115Universitetska Str.9700 ShumenBulgaria

In this paper results from the optical photometric observations of the pre-main sequence star V1180 Cas are *** star is a young variable associated with the dark cloud Lynds 1340,located at a distance of 600 pc from the Sun in the star-forming region in Cassiopeia.V1180 Cas shows large amplitude variability,interpreted as a combination of accretion-induced and extinction-driven *** data from VRI CCD photometric observations of the star were collected from September 2011 to February *** our monitoring,we recorded several brightness dips with large amplitudes of up to 5 mag(I band).At the same time,increases in brightness over periods of several weeks have also been *** this paper,we compare the photometric data obtained for V1180 Cas with observations of other low-mass pre-main sequence objects.

关键词： stars:variables:T Tauri Herbig Ae/Be stars:pre-main sequence stars:evolution

BV(RI )c photometric study of three variable PMS stars in the field of V733 Cephei

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Research in Astronomy and Astrophysics 2020年第12期20卷 221-228页

作者： Sunay Ibryamov evgeni Semkov Stoyanka Peneva Kristina Gocheva Department of Physics and Astronomy University of Shumen115Universitetska Str.9700 ShumenBulgaria Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72Tsarigradsko Shose Blvd.1784 SofiaBulgaria

This paper reports results from the first long-term BV(RI)c photometric CCD observations of three variable pre-main-sequence stars collected during the period from February 2007 to January 2020. The investigated stars are located in the field of the PMS star V733 Cep within the Cepheus OB3 association. All stars from our study show rapid photometric variability in all-optical passbands. In this paper, we describe and discuss the photometric behavior of these stars and the possible reasons for their variability. In the light variation of two of the stars, we found periodicity.

关键词： stars:pre-main sequence stars:variables:T Tauri,Herbig Ae/Be techniques:photometric methods:observational,data analysis stars:individual(2MASS J22534654+6234582,2MASS J22533629+6231446,2MASS J22531578+6235262)

Long-term BV RI photometric light curves of 15 PMS stars in the star-forming region IC 5070

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Research in Astronomy and Astrophysics 2018年第11期18卷 63-74页

作者： Sunay Ibryamov evgeni Semkov Teodor Milanov Stoyanka Peneva Department of Physics and Astronomy Faculty of Natural Sciences University of Shumen Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences

This paper reports results from the multicolor photometric observations of 15 pre-main sequence stars collected in the period September 2010-October 2017. The stars from our study are located in the star-forming HII region IC 5070. These objects were previously detected as either emission line stars, flare stars, T Tauri variables or Herbig Ae/Be stars. Photometric observations, especially concerning the long-term behavior of the objects, are missing in the literature. We present the first photometric monitoring for all stars from our study. The analysis of the obtained BV RI photometric data allows us to draw the conclusion that all investigated objects are variable stars. In the case of LkHα 146,we identified previously unknown periodicity in its photometric variability.

关键词： stars: pre-main sequence stars: variables: T Tauri Herbig Ae/Be stars: individual

Integrated flat-top reflection filters operating near bound states in the continuum

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Photonics Research 2019年第11期7卷 1314-1322页

作者： Leonid L.Doskolovich evgeni A.Bezus Dmitry A.Bykov Image Processing Systems Institute-Branch of the Federal Scientific Research Centre"Crystallography and Photonics"of Russian Academy of Sciences Samara 443001Russia Samara National Research University Samara 443086Russia

We propose and theoretically and numerically investigate narrowband integrated filters consisting of identical resonant dielectric ridges on the surface of a single-mode dielectric slab waveguide. The proposed composite structures operate near a bound state in the continuum(BIC) and enable spectral filtering of transverseelectric-polarized guided modes propagating in the waveguide. We demonstrate that by proper choice of the distances between the ridges, flat-top reflectance profiles with steep slopes and virtually no sidelobes can be obtained using just a few ridges. In particular, the structure consisting of two ridges can optically implement the second-order Butterworth filter, whereas at a larger number of ridges, excellent approximations to higher-order Butterworth filters can be achieved. Owing to the BIC supported by the ridges constituting the composite structure, the flat-top reflection band can be made arbitrarily narrow without increasing structure size. In addition to the filtering properties, the investigated structures support another type of BIC-the Fabry–Perot BIC-arising when the distances between adjacent ridges meet the Fabry–Perot resonance condition. In the vicinity of the Fabry–Perot BIC, an effect similar to electromagnetically induced transparency is observed, namely, sharp transmittance peaks against the background of a wide transmittance dip.

关键词： filters Butterworth filtering