Gravitational waves may be from fractures in space-time

Pluto probe makes 3 more discoveries in solar system | Gravitational waves may be from fractures in space-time | Space quiz! NASA's Pluto probe flew by the dwarf planet nearly eight years ago, but the epic encounter is still bearing scientific fruit. What is the name of this probe? Created for znamenski.spacecom@blogger.com |  Web Version March 16, 2023 CONNECT WITH SPACE.COM       Something amazing every day. SIGN UP ⋅   WEBSITE   The Launchpad Pluto probe makes 3 more discoveries in solar system (NASA/JHUAPL/SwRI) New findings keep on coming from the mission's July 2015 Pluto flyby. Full Story: Space (3/16)  Gravitational waves may be from fractures in space-time (Victor de Schwanberg/Science Photo Library/Getty Images) The early universe may have been such a violent place that space-time itself fractured like a pane of glass, releasing gravitational waves that astronomers say we may have already detected. Full Story: Space (3/15)  POLL QUESTION: Space quiz! NASA's Pluto probe flew by the dwarf planet nearly eight years ago, but the epic encounter is still bearing scientific fruit. What is the name of this probe? Learn the answer here! New Horizons MAVEN Rosetta Deep Space 1 Space Deal of the Day Telescope deal: The Celestron Travelscope 60 is under $40 (Celestron) You'll do well to discover a telescope this good at this price again, the Celestron Travelscope 60 is now just $38, saving over $60. Full Story: Space (3/16)  Skywatching Orion goes from hunter to hunted in the March night sky (Mark Garlick/Science Photo Library/Getty Images) The constellation of Orion represents the hunter for most of the year, but in mid-March, this prominent collection of stars becomes hunted by skywatchers. Full Story: Space (3/16)  Spaceflight 1st Artemis spacesuits on the moon will not return to Earth (collectSPACE.com) 'The spacesuits will go back on Starship, and then Starship will remain in [lunar] orbit indefinitely.' Full Story: Space (3/15)  Astronaut wants the world to 'share in that joy' (SpaceX) Shortly after coming home from the International Space Station, NASA's Nicole Mann talked about how she is trying to bring others into the field by sharing her journey. Full Story: Space (3/15)  Science & Astronomy Active volcano spotted on Venus. The planet's not dead yet. (NASA/JPL-Caltech) The latest finding marks the first time that scientists have found direct evidence of recent volcanic activity on the surface of Venus, Earth's closest neighbor. Full Story: Space (3/16)  SpaceX SpaceX Dragon arrives at space station with NASA supplies (NASA) The capsule docked with the space station at 7:31 a.m. EDT on Thursday (March 16). Full Story: Space (3/16)  Entertainment Queen guitarist and astrophysicist Brian May knighted (Victoria Jones - WPA Pool/Getty Images) The legendary musician, activist and scientist was honored at Buckingham Palace this week. Full Story: Space (3/15)  Star Trek 'Picard' features the brief return of a 'TNG' favorite (Paramount Plus) Fans will squeal as a beloved B-character makes her 'Trek' encore - and then just as quickly makes her 'Trek' exit. Full Story: Space (3/16)    Sign Up  |    Update Profile  |    Unsubscribe Privacy Policy  |    Cookies Policy  |    Terms and Conditions CONTACT US: FEEDBACK  |    ADVERTISE Future US LLC © Full 7th Floor, 130 West 42nd Street, New York, NY, 10036

Seminars Digest, Vol 52, Issue 3

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Today's Topics:

1. Friday 17.03.2023 (Serge Krashakov)

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Message: 1
Date: Wed, 15 Mar 2023 21:12:22 +0300
From: Serge Krashakov <sakr@itp.ac.ru>
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Friday 17.03.2023
Message-ID: <c670cb6c-8c82-b08c-9ee6-e0e7664924df@itp.ac.ru>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Уважаемые коллеги!

На заседании Ученого совета в пятницу  17 марта в 11:30 будут заслушаны
2 доклада:

1) С.И. Матвеенко
*Ротоны в Бозе-конденсате дипольных атомов.*

Найдены аналитические и численные решения для спектров возбуждений
ротонного типа в квазиодномерном Бозе-конденсате магнитных дипольных
атомов. Вычислен коэффициент затухания возбуждений при конечной
температуре. Результаты могут быть применимы к конденсату атомов
диспрозия, для которого показано, что ротонные возбуждения достаточно
долгоживущие и могут быть наблюдаемы.

2) Н.А. Иногамов
*Структурирование поверхности кремния с помощью фемтосекундного импульса
и дифракции на микропузырьке*. (короткий доклад)

Laser-assisted nanostructuring of silicon interfaces provides a unique
procedure for leading-edge technologies. We report on a new embossing
technique with tightly focused Gaussian-shaped ultrashort laser pulses
near the ablation threshold in liquid. We take advantage of a primary
microbubble for controllable spatial-modulation of light intensity of
succeeding pulses. Such a bubble, generated in liquid near the molten
silicon surface by the first pulse, serves as an obstacle for the second
pulse following with a sub-millisecond time delay, to produce a
diffraction ring pattern. Variation of laser intensity can be utilized
to guide the diffraction patterns. Thus the various annular patterns
deeply embossed up to hundreds nanometers on the surface are produced
with high reproducibility. Morphology of modified surface layer is
investigated in detail using atomic-force microscopy, as well as
scanning and transmission electron microscopies. Full-wave EM modeling
of laser beam diffraction by the bubbles with various radii and shapes
shows that the peak intensity in silicon is up to 1.7 times higher than
in bubble-free liquid. Atomistic simulation of ultrafast heating with
such a diffraction peak reveals that an annular microdimple surrounded
by rims is formed by high-gradient pressure in molten silicon to be
frozen after several nanoseconds.
S.A. Romashevskiy, A.I. Ignatov, V.V. Zhakhovsky, E.M. Eganova, E.A.
Pershina, N.A. Inogamov, S.I. Ashitkov, Embossing of silicon with an
ultrashort laser pulse diffracted by a bubble in liquid, Applied Surface
Science, 615, 156212 (2023)

ID и пароль онлайн-трансляций в Zoom те же, что и для предыдущих
трансляций докладов на Ученом совете:
https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09
Meeting ID: 968 9936 4518
Пароль: 250319

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