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DTSTART;TZID=America/Chicago:20160714T140000
DTEND;TZID=America/Chicago:20160714T150000
DTSTAMP:20260612T233309
CREATED:20160711T220242Z
LAST-MODIFIED:20160711T220934Z
UID:10378407-1468504800-1468508400@uwm.edu
SUMMARY:Colloquium: Sung Soon Kim
DESCRIPTION:This special Physics department colloquium is scheduled for Thursday 7/14/16 at 2:00 PM in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1140.  Coffee and cookies will be available in KEN 3118 (third floor kitchenette located next to the elevators) at 1:30 PM.  Anyone is welcome. \nReconstruction of 3D Image for Particles by the Method of Angular Correlations from XFEL Data\nSung Soon Kim\, PhD Candidate/UWM Dept. of Physics \nThe world’s first X-ray Free Electron Laser (XFEL)\, the Linac Coherent Light Source (LCLS) at the Stanford Linear Accelerator Center (SLAC)\, is now generating X-ray pulses of unprecedented brilliance (one billion times brighter than the most powerful existing sources)\, and at the amazing rate of only a few femtoseconds.  The first such experiments are being performed on relatively large objects such as viruses\, which produce low resolution\, low-noise diffraction patterns on the basis of the so called “diffraction before destruction” principle.  Despite the promise of using XFEL for the determination of the structures of viruses\, the results so far from experimental data present difficulties in working to reconstruct 3D images for the viruses of our interest. One of the rare exceptions has been reported from the recent paper (PRL. 114\, 098102\, 2015) by the Hajdu group\, who reconstructed a 3D image of the mimi virus.  \n              In this present paper\, we examine the capabilities of the method that is based on the angular momentum decomposition of scattered intensities\, which enables us to overcome common problems such as missing or imperfect data that are inevitable in experiments.  This angular momentum decomposition method helps to avoid the effect of a finite beam size and existing gap size. In addition to the problem caused by the finite panels of detectors used when the data are collected\, the effect of noise\, curved Ewald Sphere\, shot to shot variations of incident X-ray pulse intensities and shots to multiple nano particles are also studied.
URL:https://uwm.edu/physics/event/colloquium-sung-soon-kim/
LOCATION:KEN 1140\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20160713T140000
DTEND;TZID=America/Chicago:20160713T150000
DTSTAMP:20260612T233309
CREATED:20160708T193651Z
LAST-MODIFIED:20160708T193947Z
UID:10378406-1468418400-1468422000@uwm.edu
SUMMARY:Colloquium: Sandi Wibowo
DESCRIPTION:This special Physics department colloquium is scheduled for Wednesday 7/13/16 at 2:00 PM in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1140.  Coffee and cookies will be available in KEN 3118 (third floor kitchenette located next to the elevators) at 3:00 PM.  Anyone is welcome. \nSymmetry and the Reconstruction of Particle Structure in an X-ray Free Electron Laser (XFEL)\nSandi Wibowo\, PhD Candidate/UWM Dept. of Physics \nThe problem of determining the structure of a biomolecule\, when all the evidence from experiment consists of individual diffraction patterns from random particle orientations\, is the central theoretical problem with an XFEL.  One of the methods proposed is a calculation over all measured diffraction patterns of the average angular correlations between pairs of points on the diffraction patterns. It is possible to construct from these a matrix B characterized by angular momentum quantum number l\, and whose elements are characterized by radii q and q’ of the resolution shells.  If matrix B is considered as dot product of vectors\, which magnetic quantum number m is the component\, singular value of B reveals the number of magnetic quantum numbers in the spherical harmonics expansion.  What is shown in this paper is dependency of magnetic quantum number on symmetry can be associated to lowest independent parameter to describe symmetry.  At the very least\, this determines information about particle symmetry from experiment data\, independent of any assumed symmetry. An equally important point is that matrix B provides a means of reconstructing diffraction volume.  This can be done by formulating intensity and matrix B as linear equation.  Lastly\, positivity constraint and optimization method is used to construct diffraction volume and phase is determined from phasing algorithm.
URL:https://uwm.edu/physics/event/colloquium-sandi-wibowo/
LOCATION:KEN 1140\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20150709T150000
DTEND;TZID=America/Chicago:20150709T160000
DTSTAMP:20260612T233309
CREATED:20150707T150224Z
LAST-MODIFIED:20230207T161307Z
UID:10369346-1436454000-1436457600@uwm.edu
SUMMARY:Colloquium: Shivani Rajput
DESCRIPTION:This special Physics department colloquium is scheduled for Thursday 7/9/15 at 3:00 pm in in the Kenwood Interdisciplinary Research Complex (KIRC) Room KEN 1140.  Tea\, coffee\, and cookies will be available in KEN 3118 (third floor kitchenette located next to the elevators) at 2:30 PM.  Anyone is welcome. \nTunneling Experiments with Dirac Electrons in Graphene Heterojunctions\nShivani Rajput\, PhD Candidate/UWM Dept. of Physics \nSparked by the isolation of graphene in 2004\, recent research has uncovered a new class of materials with their low-energy excitations behaving a massless Dirac particles rather than fermions obeying the canonical Schrödinger equation.  In this talk\, using graphene as an example\, I will first briefly give a sense of why Dirac materials have generated such excitement in condensed matter physics.  I will then present my research on the understanding of graphene heterojunctions at the atomic scale using scanning tunneling microscopy/spectroscopy.  In the first case\, I will show how charge carriers in graphene can be controlled by substrate polarization in graphene-SiC heterojunctions.  In the 2nd case\, I will present the atomic resolution imaging of graphene ripples and other intrinsic spatial inhomogeneities that affect the Schottky barrier at graphene-semiconductor junctions.  Lastly\, I will show the transfer of giant spin-orbit coupling in graphene through proximity to a three-dimensional-topological insulator Bi2Se3\, making possible the observation of the quantum spin Hall effect at room temperature.
URL:https://uwm.edu/physics/event/colloquium-shivani-rajput/
LOCATION:KEN 1140\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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