Seminars and Colloquia, July through December, 2019


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Seminars and Colloquia, Typical Week:


Oklahoma High Energy Physics Seminar on Talk-Back Television:

Date:Thursday
Time:1:30-3:00 PM
Place:106 B Studio Room, Classroom Building, OSU
& Nielsen Hall, Room 103, OU
Inquiries: kaladi.babu@okstate.edu or kao@nhn.ou.edu

Physics Colloquium:

Date:Thursday
Time:3:30-4:30 PM
Place:PS 110
Inquiries: joseph.haley@okstate.edu or mario.borunda@okstate.edu

Journal Club on Statistical Mechanics and Condensed Matter Physics, and Optics (Informal):

Date:Friday (bi)weekly
Time:2:00 PM
Place:PS 147
Inquiries: mario.borunda@okstate.edu

Oklahoma State Physics Department

Seminars and Colloquia, July 1-5, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, July 8-12, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, July 15-19, 2019


Physics Colloquium:

Speaker:Dr. Ramona Gaza
NASA/HH&P Radiation SME and MARE Science Lead
Leidos, Houston, Texas
Speaker:Dr. Razvan Gaza
Orion Radiation SME and MARE Project Manager
Lockheed Martin Space, Bethesda, Maryland
Date:Thursday, July 18, 2018
Time:3:30 PM
Place:PS 110
Title:The Ionizing Radiation Environment for Human Space Flight: Risks and Mitigations

Abstract:

Space is a harsh environment for human explorers. Ionizing radiation occurs naturally in space, and can have detrimental effects on both the spacecraft hardware and the health of the astronaut crew.

This presentation provides an overview of the space ionizing radiation environment, NASA radiation measurements and instrumentation, models and tools used for radiation exposure predictions, space weather forecasting needs for long duration exploration missions, and exposure risks and mitigation with a focus on crew health. The particularities are discussed of the environmental components and the implications on risk assessments and spacecraft shielding efficiency.

NASA’s Exploration Program aims to return astronauts to the Moon by 2024. The Orion spacecraft is the first Exploration architecture element, and the first NASA human spacecraft to include design requirements for crew radiation protection. Orion is designed by Lockheed Martin as prime contractor. Its maiden flight Exploration Flight Test 1 (EFT-1) was successfully completed in 2014. The trajectory exposed the spacecraft to the core of the Van Allen proton belts. This provided an opportunity for validating the radiation shielding predictions by measurements. The results indicated good correlation with pre-flight predictions. Orion’s next test flight Artemis 1, formerly known as Exploration Mission 1 (EM-1) is scheduled for 2020. The 21-42 day mission to cis-lunar space provided the opportunity for a large scale international radiation experiment referred to as the Matroshka AstroRad Radiation Experiment (MARE). MARE consists of two radiotherapy phantoms—named Zohar and Helga—located in the Orion seats #3 and #4, and fitted with an extensive complement of passive and active radiation detectors. Zohar is also fitted with AstroRad—a novel individual astronaut radiation shield manufactured by StemRad Israel. This allows simultaneous characterization of the intravehicular radiation environment and mitigation efficiency. NASA, the German Aerospace Center DLR, and the Israeli Space Agency ISA are the co-principal investigators to MARE. The co-investigator team consists of dosimeter providers from 10 countries on 3 continents, and includes the Department of Physics at OSU. Lockheed Martin facilitates MARE by as payload integrator and liaison to the Orion Program on behalf of the international science team.

Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3:00 PM. All students are welcome! Refreshments will be served.


Oklahoma State Physics Department

Seminars and Colloquia, July 22-26, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, July 29-August 2, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, August 5-9, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, August 12-16, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, August 19-23, 2019


First week of classes


Physics Journal Club, special event:

Speaker:Dr. Pavel V. Avramov
Kyungpook National University
Republic of Korea
Date:Tuesday, August 20, 2019
Time:1:00 PM
Place:PS 147
Title:Downfall from Heaven: Unique carbon nanomaterials from superbolide impacts from North-East Russia

Abstract:

Unique physical properties and atomic structure of real impact diamonds from Popigai astrobleme (Yakutia, North-East Russia) and exotic closed-shell multiply twinned graphite microcrystals found in Chelyabinsk superbolide dust (Feb 15, 2013, Ural mountains, Northern Russia) were studied using ab initio DFT and MD simulations. The key features of unique atomic structure and mechanical properties of the carbon nano- and microcrystals extracted from real impact and meteorite materials were interpreted using electronic structure calculations. The unique scale and dramatic consequences of both historic events for dinosaur existence and human history makes a theoretical consideration of the carbon nanostructures critically important for survival of entire humanity.


Oklahoma High Energy Physics Seminar on Talk-Back Television:

Speaker:Dr. Graham White
Theory Group
TRIUMF, Vancouver, Canada
Date:Thursday, August 22, 2019
Time:1:30 PM
Place:PS 155, OSU
& Nielsen Hall, Room 365, OU
& Online Access
Title:Electroweak Baryogenesis, Experimental Status, Progress and Extension

Oklahoma State Physics Department

Seminars and Colloquia, August 26-30, 2019


Second week of classes.


Department of Chemistry Seminar:

Speaker:Dr. Emilie Ringe
Department of Materials Science and Metallurgy
& Department of Earth Sciences
University of Cambridge, UK
Date:Friday, August 29, 2018
Time:3:30 PM
Place:PS 103
Title:Earth-Abundant Materials for Nanoplasmonics

Abstract:

The optical properties of gold and silver nanoparticles have been known for centuries, appearing in Roman glassware as well as medieval stained glass. An understanding of the phenomenon giving rise to these brilliant colors emerged in the last century: collective oscillations of conduction electrons called localized surface plasmon resonances (LSPRs) can be excited by light, leading to wavelength-dependent absorption and scattering. LSPRs have a broad technology potential as an attractive platform for surface-enhanced spectroscopies, non-bleaching labels, hyperthermal cancer therapy, waveguides, and so on. Excitingly, this light-matter interaction can be controlled by the size, shape, and dielectric environment of the nanoparticles; enabling the manipulation of LSPR energy, absorption/scattering ratio, light confinement, as well as far-field and near-field emission geometry, all important for specific applications.

Most plasmonic metals studied to date are composed of either Cu, Ag, and Au. The former two can pose significant challenges related to oxidation, the latter is often perceived as cost-prohibitive, and all three are rare. Recently, much attention has been focused on earth-abundant Al, which is an excellent plasmonic in the UV. This talk will briefly discuss colloidal Al nanoparticles as a plasmonic material, then report results on a new composition: magnesium. Mg nanoparticles are remarkably active plasmonics across the UV, Vis and NIR, as shown optically and with STEM-EELS. Surprisingly, they are stable in air for weeks owing to a self-limiting oxide layer. Colloidal Mg has potential on its own as a plasmonic structure, and can also be used as a scaffold for additional surface chemistry, sensing, and hybrid photocatalysts.


Oklahoma State Physics Department

Seminars and Colloquia, September 2-6, 2019


Labor Day holiday: Monday, September 2.


Condensed Matter Seminar:

Speaker:Prof. Ibrahim Abu-Aljarayesh
Department of Physics
Yarmouk University, Irbid, Jordan
Date:Friday, September 6, 2019
Time:12:30 PM
Place:PS 147
Title:The Effect of Size Distribution of Particles on the Remnant Magnetization of Fine Magnetic Particles

Abstract:

The first part of the talk is about numerical calculations of the remnant magnetization of non-interacting fine magnetic particles, assuming a Gamma distribution of relaxation times. In addition, a log-normal of distribution of energy barriers have been carried out with different means and standard deviations for three systems.

The second part of the talk is about the time-dependent magnetization measurements on three systems of Fe3O4 fine particles. The remnant magnetization measurements were carried out in the temperature range T = 5 - 300 K over a period of time (t) between 30 - 300 s. The remnant magnetization was found to obey the relation M = CS ln t. Annealing the sample at 530 K was found to increase its magnetic anisotropy constant. The results were analyzed within the context of Néel theory of magnetic clusters.


Oklahoma State Physics Department

Seminars and Colloquia, September 9-13, 2019


Oklahoma High Energy Physics Seminar on Talk-Back Television:

Speaker:Dr. Othmane Rifki
Postdoctoral Research Fellow
DESY (Deutsches Elektronen-Synchrotron), Hamburg, Germany
Date:Thursday, September 12, 2019
Time:1:30 PM
Place:PS 155, OSU
& Nielsen Hall, Room 365, OU
& Online Access
Title:Higgs as a Probe for Dark Matter

Oklahoma State Physics Department

Seminars and Colloquia, September 16-20, 2019


Chemistry and Physics Colloquium:

Speaker:Dr. Bayrammurad Saparov
Department of Chemistry & Biochemistry
University of Oklahoma
Date:Thursday, September 19, 2019
Time:3:30 PM
Place:PS 103
Title:Hybrid Organic-Inorganic Halides: Crystal Chemistry, Properties and Applications

Abstract:

Our group targets preparation, single crystal growth, computational studies, and characterization of low-cost hybrid organic-inorganic and all-inorganic halides for prospective optoelectronic applications. In this general talk, I will overview the rich structural chemistry, physical properties and prospective applications of several brand-new hybrid organic-inorganic and all-inorganic halide materials. The unprecedented control over structural dimensionality, distortions and tunable chemical compositions allows for fine-tuning of physical properties of halides including their optical band gaps, transport and magnetic properties. In our group, lessons learned from literature are applied to a expand the halides family beyond Pb/Sn-based perovskites. The bird’s eye view will be concluded by our group’s recent results on (mostly) non-perovskite halides, which demonstrate ultrabright room-temperature luminescence with quantum yield values approaching unity.

Note: Refreshments served in PS 147 at 3:00 PM.


Oklahoma State Physics Department

Seminars and Colloquia, September 23-27, 2019



Oklahoma State Physics Department

Seminars and Colloquia, September 30-October 4, 2019



Oklahoma State Physics Department

Seminars and Colloquia, October 7-11, 2019



Oklahoma State Physics Department

Seminars and Colloquia, October 14-18, 2019



Oklahoma State Physics Department

Seminars and Colloquia, October 21-25, 2019


Fall Break: No classes Friday, October 25.


Oklahoma State Physics Department

Seminars and Colloquia, October 28-November 1, 2019



Oklahoma State Physics Department

Seminars and Colloquia, November 4-8, 2019



Oklahoma State Physics Department

Seminars and Colloquia, November 11-15, 2019



Oklahoma State Physics Department

Seminars and Colloquia, November 18-22, 2019



Oklahoma State Physics Department

Seminars and Colloquia, November 25-29, 2019


Thanksgiving

Students’ Thanksgiving break, November 27-29.


Oklahoma State Physics Department

Seminars and Colloquia, December 2-6, 2019


Prefinals Week


Oklahoma State Physics Department

Seminars and Colloquia, December 9-13, 2019


Finals Week


Oklahoma State Physics Department

Seminars and Colloquia, December 16-20, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, December 23-27, 2019


No talks scheduled


Oklahoma State Physics Department

Seminars and Colloquia, December 30-31, 2019


No talks scheduled


Last Updated:

perk@okstate.edu