Seminars Digest, Vol 84, Issue 4

Send Seminars mailing list submissions to seminars@itp.ac.ru To subscribe or unsubscribe via the World Wide Web, visit https://mailman.itp.ac.ru/mailman/listinfo/seminars or, via email, send a message with subject or body 'help' to seminars-request@itp.ac.ru You can reach the person managing the list at seminars-owner@itp.ac.ru When replying, please edit your Subject line so it is more specific than "Re: Contents of Seminars digest..." Today's Topics: 1. Friday 24.04.2026 (info+seminars@itp.ac.ru) 2. Thursday 23.04.2026 - ITP/CAS Colloquium (info+seminars@itp.ac.ru) ---------------------------------------------------------------------- Message: 1 Date: Tue, 21 Apr 2026 07:02:01 +0000 From: info+seminars@itp.ac.ru To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru Subject: [Landau ITP Seminars] Friday 24.04.2026 Message-ID: <vycmePoTD1oZlZHOOGe2k8YKmmZTaoMdXWiEXiaT0@wwwserv2> Content-Type: text/plain; charset=UTF-8 Уважаемые коллеги! На заседании Ученого совета ИТФ в пятницу 24.04 будет заслушан 1 доклад: 11:30 М.А. Шишкин, Е.С. Пикина, В.В. Лебедев Режимы жемчужной динамики везикул Мы изучаем &quot;pearling instability&quot; вытянутых везикул под натяжением [Bar-Ziv and Moses, PRL, 1994], сходную классической неустойчивости Рэлея–Плато. В первую очередь мы строим аналитическую теорию маргинальных мод при плавно изменяющемся вдоль везикулы поверхностном натяжении. Это позволяет объясняснить расхождение между численным моделированием динамики в растягивающем потоке [Narsimhan et al., JFM, 2015], где неустойчивость распространяется от краев, и экспериментами [Kantsler et al., PRL, 2008]: учёт небольшого маргинального возмущения в нашем моделировании приводит к образованию первых жемчужин именно в центре. После формирования жемчужин динамика определятся зависимостью растягивающей силы от длины везикулы: возможен каскад неустойчивостей или квазистационарный режим. В последнем случае медленная динамика связана с перекачкой жидкости между жемчужинами; при локализованном воздействии на краях, крупные жемчужины поглощают мелкие. Рассматривая &quot;свободные жемчужины&quot; как солитонные стационарные решения на цилиндрическом фоне, мы устанавливаем убывающий характер зависимости поверхностного натяжения от размера жемчужины, что и объясняет неустойчивость состояния с несколькими жемчужинами. ID и пароль онлайн-трансляций в Zoom те же, что и для предыдущих трансляций семинаров и докладов на Ученом совете: https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09 Meeting ID: 968 9936 4518 Пароль: 250319 ------------------------------ Message: 2 Date: Tue, 21 Apr 2026 07:02:02 +0000 From: info+seminars@itp.ac.ru To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru Subject: [Landau ITP Seminars] Thursday 23.04.2026 - ITP/CAS Colloquium Message-ID: <JA9keswBSoM1GC8mRH8Kz6MLcH7eV5kwoDDcvUv3ic@wwwserv2> Content-Type: text/plain; charset=UTF-8 Уважаемые коллеги! На онлайн коллоквиум по теоретической физике в четверг 23.04 будут заслушаны 2 доклада: 1) 10:00:00 по московскому времени: Vladimir Mineev (Landau Institute for Theoretical Physics) Effective Mass and Field-Reinforced Superconductivity in Uranium Compounds The presented theory of strong coupling superconductivity in uranium compounds is based on electron–electron interaction through magnetic fluctuations described by frequency-dependent magnetic susceptibility. The magnetic field dependence of the electron effective mass is expressed through the field dependence of the magnetic susceptibility components. It is shown that the intensity of triplet pairing, and hence the critical temperature of the transition to the superconducting state, are also determined by the field-dependent susceptibility. The results are discussed in relation to the properties of ferromagnetic uranium compounds URhGe and UCoGe. Biography V.Mineev graduated from Moscow Institute of Physics and Technology in 1969. He defended his PhD Thesis (1974) and Doctor of Science Degree (1983) in Landau Institute for Theoretical Physics Moscow, USSR. During 1992-1999 V.P. Mineev was Vice-director of the Landau Institute and at the same time Professor and Head of Chair « Problems of Theoretical Physics »in Moscow Institute of Physics and Technology. Since 1999 till 2022 he was Senior Researcher in Commissariat a l’Energie Atomique, Grenoble, France. At present he is Principal Researcher in Landau Institute for Theoretical Physics. V.P.Mineev is awarded by L.D.Landau prize of Russian Academy of Sciences in 1992 and by Onsager prize of American Physical Society in 2014. Books 1. « Topologically Stable Defects and Solitons in Ordered Media », Harwood Academic Publishers 1998. 2. « Introduction to Unconventional Superconductivity » (in co-authorship with K.V.Samokhin) Gordon and Breach Science Publishers 1999. 3. “Kinetics” (in co-authorship with V.N.Gorelkin) МЦНМО 2024. Zoom: 836 2705 2896 Passcode: 631540 2) 11:00:00 по московскому времени: Yi-Bo Yang (Institute of Theoretical Physics, Chinese Academy of Sciences) Masses of Hadrons Containing Heavy Quarks and Their QED Corrections In theory, Quantum Chromodynamics only needs quark masses and the strong coupling constant calibrated from experimental data to predict hadronic properties. In practice, achieving this and understanding the transition from quark to hadron masses relies on large-scale first-principles lattice QCD simulations. Using domestically generated CLQCD gauge configurations, we developed numerical techniques to systematically study ground-state hadrons containing up, down, strange, charm, and bottom quarks, including QED corrections. We compute their masses and decay constants, which effectively support phenomenological and experimental studies on the origin of hadron masses and in flavor physics. Biography: Prof. Yi-Bo Yang has been engaged in the study of hadron structure in lattice quantum chromodynamics (LQCD), focusing on the origin of mass in strong interactions and the internal structure of hadrons. He has collaboratively ported LQCD software to various domestic exascale architectures, achieving full-system operation. This enabled the construction of the CLQCD ensembles which can provide independent and precise predictions for strong interactions. He also established the Lattice Parton collaboration and serves as the spokesperson. His work on the gluon contribution to nucleon spin was selected as a highlight of the year by the American Physical Society in 2017. Zoom: 836 2705 2896 Passcode: 631540 Zoom meeting ID: 890 7187 2369 Пароль: 544845 ------------------------------ Subject: Digest Footer _______________________________________________ Seminars mailing list Seminars@itp.ac.ru https://mailman.itp.ac.ru/mailman/listinfo/seminars ------------------------------ End of Seminars Digest, Vol 84, Issue 4 ***************************************

Up to 20 meteors per hour — the Lyrids peak this week

See shooting stars, earthshine and a rare moon-star occultation Created for znamenski.spacecom@blogger.com | Web Version   April 20, 2026 FOLLOW US FOLLOW US   Just Look Up! SIGN UP ⋅   SHARE   What's Up This Week? Hello skywatchers! It's a great week to look up — with meteor activity building, a glowing crescent moon lighting up the evenings and a few skywatching events worth staying up late for. The headline event is the peak of the Lyrids meteor shower, which could deliver up to 20 meteors per hour under dark skies. You'll also have a chance to spot delicate earthshine on the moon and catch a close pairing with the Beehive Cluster. Elsewhere in this issue, we've got everything you need to make the most of the Lyrids, plus a spectacular photo of Comet C/2025 R3 (PanSTARRS) glowing above a false dawn. We're also diving into a remarkable story of just 12 people witnessing a rare annular "ring of fire" solar eclipse from Antarctica and how one observer had to improvise to capture the perfect shot.  Here's what to watch for in the nights ahead.  Daisy Dobrijevic  Skywatching Editor, Space.com (Starry Night) Monday, April 20: Earthshine  Look for the soft glow of earthshine on the crescent moon. Sunlight reflected off Earth will gently illuminate our lunar neighbor's dark side. (Starry Night) Wednesday, April 22: Lyrid meteor shower peak (predawn)  The Lyrid meteor shower peaks before dawn, with up to 20 meteors per hour and a chance of bright fireballs. (Starry Night) Thursday, April 22: Moon meets the Beehive The half-lit moon passes close to the Beehive Cluster in Cancer. This sight is best viewed with a pair of binoculars. (Starry Night) Saturday, April 25: Moon occults Regulus  Observers in parts of the Americas can watch the moon pass in front of Regulus. The moon will be in its waxing gibbous phase and approximately 71% illuminated. Moon Calendar Notable moon phase: First quarter moon  The moon reaches its first quarter on April 23, appearing half-illuminated in the evening sky. This is one of the best times to explore the lunar surface, as low-angle sunlight casts dramatic shadows across craters and mountain ranges along the terminator.  Want to explore more? Check out our ultimate guide to observing the moon for tips and tools to get the most out of each phase. Read More Meteor Shower Alert! Lyrid meteor shower 2026: When, where & how to see it The best time to view the Lyrids this year will be early morning on April 22. Read More How to see the Lyrid meteor shower 2026: Where to look in the night sky The Lyrids are back! Here's where to look and how to spot these shooting stars. Read More In The News 'God of Chaos' asteroid Apophis will blaze across the sky on April 13, 2029 — here's why this once-in-a-lifetime event is worth traveling for A rare stargazing spectacle will unfold on Friday, April 13, 2029, as the asteroid Apophis passes closer than satellites over Europe and Africa in a true once-in-a-lifetime event. Read More Solar Eclipse Only 12 people on Earth saw this 'ring-of-fire' eclipse. Here's how one improvised to capture a once-in-a-lifetime photo from Antarctica A remote Antarctic research team became the only people on Earth to witness a rare annular solar eclipse — and one scientist had to improvise to capture it. Your Amazing Astrophotos See Comet PanSTARRS glow above a false dawn in stunning new photo The comet is already visible to the naked eye ahead of its perihelion passage on April 19. Read More Astronomy Kit and Accessories The best accessories for your new astrophotography camera These astrophotography camera accessories are worth adding to your setup in 2026. Read More Best tripods 2026: For astrophotography, landscapes, travel, video and more Owning one of the best tripods for your camera is essential whether you're shooting astrophotography, landscape or portraits. Read More Stay up-to-date on all things space science, news, and entertainment by subscribing to our newsletters. Sign Up   Follow Night Sky This Week Contact Us: Feedback | Advertise Sign Up | Update Profile | Unsubscribe Privacy Policy | Cookies Policy | Terms and Conditions When you purchase through links in our content, we may earn an affiliate commission.   Future US LLC © Full 7th Floor, 130 West 42nd Street, New York, NY, 10036.