Fort Hays State University > About FHSU > Academic Divisions > College of Arts and Sciences > Department of Physics > Seminar
For the 2012-2013 academic year the department of physics will be hosting seminar talks every other Friday afternoon in TH209. Refreshments will be served starting at 3:00 p.m., and the talks will begin at 3:30 p.m. The duration of the talks may range from 15 minutes to 50 minutes, and they will be at a level accessible to freshmen physics majors. Non-physics faculty and students are welcome to attend. If you wish to contribute a talk, please contact the chair of the seminar committee, Dr. C.D. Clark III.
Fall 2012 Schedule
11/30/2012, Aaron Hoffman, 3D Printing3D printing is a form of additive manufacturing in which material is placed by a machine in order to build a 3D object. RepRap is a project that uses open source hardware and software with the end goal of creating self-replicating 3D printers available at low cost. A brief introduction to the RepRap project will be presented followed by Q&A and a live 3D printing demonstration. http://youtu.be/bzznVr3yeTk
11/09/2012, Dr. Amit Chakrabarti, Fat Fractals, Skinny Nuclei, and Patchy ProteinsI will start my talk with an overview of the physics department's internationally recognized research in atomic molecular-optical (AMO) physics (ranked 13th in the nation), soft-matter physics, high-energy physics, physics education, and cosmology. K-State physics faculty currently includes nine fellows of the American Physical Society (APS) and two Carnegie National Professor of the Year winners - making K-State's Department of Physics the only department in the nation to have two recipients of this award. Next I will discuss my own research in soft condensed matter physics with an emphasis on how small particles in a dispersed phase come together to form larger clusters when the small particle system becomes, by some manner, unstable. From a broad perspective, the "particles" can be aerosols, colloidal particles, nanoparticles, or protein molecules, and the transition from a dispersed phase to clusters can include the formation of precipitated crystalline solids from solutions as well as the formation of fractal aggregates and gels. http://youtu.be/WlYHFVSN7VI
10/26/2012, Dr. Eric Deyo, The Higgs BosonThe Higgs Boson is an elementary particle that was predicted to exist in 1964 by Peters Higgs (along with his collaborators) to explain why things have mass. Since then, physicists have been working to observe the particle, building larger and larger particle colliders. The Higgs Boson seems to have recently been discovered at the Large Hadron Collider in CERN. I will talk about the physics behind the existence of this particle.
10/12/2012, Dr. Kayvan Aflatooni
09/28/2012, Dr. Jack Maseberg, Numerically solving the time-dependent Schrodinger equationA historical and simplistic method for numerically solving the Schrodinger equation in one dimension will be presented. Following this, a brief review of more recent numerical techniques and boundary conditions will be provided. There will be pretty pictures, movies, and cookies!
09/14/2012, Dr. Gavin Buffington, The Basis-Spline Colocation Method: A More Sophisticated Method for Solving Differential Equations on a ComputerAn introduction to the basis spline collocation method (BSCM) for solving partial differential equations numerically will be presented. Familiarity with common differential equations encountered in undergraduate physics and the finite difference method will be beneficial. Strengths and weaknesses of this method will be considered with respect to single and parallel processor computers. Examples of the eigen value problem and the initial-boundary value problem will be presented.
08/31/2012, Dr. C.D. Clark III, The Finite-Difference Method: Solving Differential Equations on a ComputerA very basic introduction to the Finite-Difference method is
presented. Exposure to differential equations is beneficial, but not required as overview of partial differential equations is covered in the background portion of the talk. A motivation for using computers to
solve differential equations is given, and the standard Finite-Difference technique is developed using the 1D, time-dependent heat equation as an example.
Spring 2012 Schedule
05/04/2012, SooBum Kim, Robots: the Arduino, Kinect, and openFrameworksSooBum will describe and demonstrate a robotics project which involves micro-controllers, wireless communication, and vision systems.
04/27/2012, Dr. Tara Adams, Unraveling the Mechanisms behind Bleeding in von Willebrand DiseaseVon Willebrand factor (VWF) is a multimeric plasma protein that plays a critical role in hemostasis by mediating platelet adhesion at sites of blood vessel injury. Von Willebrand disease (VWD) is a bleeding disorder associated with either a quantitative (Types 1 and 3) or functional defect (Type 2) in VWF. Although VWD is the most frequently diagnosed bleeding disorder in the world, clinical diagnostic values do not correlate well with bleeding severity. We hypothesize that the phenotypic variability observed in VWD (particularly in type 1 VWD) is related to the degree of incorporation of mutant monomers into VWF multimers. We demonstrate here that increasing the transfection ratio of mutant:wild-type cDNA in cell culture has variable effects on the production, assembly and secretion of our type 1 VWD mutants, which may explain the decreased levels of plasma VWF in patients with these mutations. Moreover, by exploiting the dynamic nature of the VWF-platelet interaction in our model flow system, we expect to identify subtle functional defects in our VWD mutants that cannot be detected with the current clinical VWD panel. Ultimately, the information generated by this study may allow clinicians to provide more individualized therapy for patients living with VWD.
04/13/2012, Dr. Bharat Ratra, The "Standard" Model of CosmologyExperiments and observations over the last decade have provided strong support for a "standard" model of cosmology that describes the evolution of the universe from an early epoch of inflation to the complex hierarchy of structure seen today. I review the basic physics, astronomy, and history of ideas on which this model is based. I describe the data which persuade cosmologists that (as yet undetected) dark energy and dark matter are by far the main components of the energy budget of the universe. I conclude with a list of open cosmological questions.
03/30/2012, Doug Goddard, High Energy Laser InstrumentationThe AEgis Technologies Group is addressing the need to directly measure the beam profile on the surface of a material exposed to high energy laser (HEL) radiation. To overcome this technology gap, AEgis is developing two arrays of resistive temperature detectors (RTDs), one of which also measures irradiance directly. The first array is being fabricated in an open mesh architecture so that 90% of the beam directly hits the target with minimal impact on thermal and aerodynamic nano fabricated material to directly measure the irradiance level, a resistive temperature detector (RTD) that measures temperature, and a protective coating that ensures survivability of the microsensors in the HEL beam. The second system measures the temperature on the backside of its target and then calculates the beam profile by using inverse heat conduction (IHC) modeling to deduce the heat flux distribution on the front surface of the target. Each array of RTDs is printed on flexible substrates, which allow attachment of the sensor matrix to materials of arbitrary curvature in a conformal manner with minimal impact to the target. The microprinting technique developed for HEL diagnostics can provide large arrays of low cost (disposable), high-resolution temperature sensors that can be quickly attached to a target. This discussion will report results from recent sensor demonstrations on each sensor array and IHC model development, as well as validation of the IHC model.
03/09/2012, Dr. Jack Maseberg and Dr. Paul Adams, Scientific balloonsThe results from FHSU's first successful High-Altitude Balloon Launch (December 16, 2011) will be presented. The launch was a joint venture of an undergraduate research experience (URE) project and a class project for the Introduction to Engineering Science class.
02/10/2012, Dr. C.D. Clark III, Tensors in curved space: The mathematics of General RelativityGeneral Relativity (Einstein’s theory of relativity that includes gravity) is based on an advanced mathematical theory called Tensor Analysis. While undergraduate physics students are typically familiar with the ideas of general relativity (the curvature of space-time), they rarely are exposed the mathematics it involves. In this talk, the audience will be introduced to the concepts of tensors (abstract vectors) and geometry in curved space. The connection to general relativity will be shown, and an example involving our own Tomanek Hall pendulum will be presented.
01/27/2012, Jaron Hake, Electron energy loss spectroscopy and SIMION simulationsA brief introduction to the method of Electron Energy Loss Spectroscopy (EELS) will be provided, including some relevant examples and useful applications. Jaron will then introduce SIMION software and report on his current progress regarding the modeling of the EELS apparatus located in TH203. The SIMION model will eventually provide valuable insight into what specific voltages should be applied to various electron lenses in order to obtain an optimum electron beam.
Fall 2011 Schedule
12/02/2011, Justin Maughan, Matt Dinkel, Aryton Pittman, Naomi Kitzis, Brent Risting, Aaron Hoffman, Taylor Kane, and Kristen Brake; Predicting Skin Damage from Laser LightThe dangers of laser light, and the need to develop safe practices for its use, have been recognized since the laser’s invention. Ultimately, to determine if a laser is “safe”, we must know when it is “dangerous”. The modeling group in the FHSU physics department has helped developed a model for laser-tissue damage (a C++ program that can predict whether or not a laser will cause damage to tissue) and uses this model to analyze the hazards of various laser systems. In this presentation, the group will present the work done over the last semester in analyzing the dangers of a 1319 nm laser to skin tissue.
11/11/2011, Linnea Gustafsson, Towards Localized Cancer TreatmentIn 2010 more than 1.5 million people living in the United States were diagnosed with cancer. Over half a million died from the disease in the U.S. alone. Not surprisingly, it is a lifelong goal for many scientists to understand the disease more in depth as well as finding the ultimate cure. One of the most common ways to treat cancer today is through various types of radiation treatments. However, this method kills both healthy cells and tumor cells. The more localized the treatment becomes, the less healthy cells are damaged. In this presentation, Miss Gustafsson will introduce how today's localized cancer treatment can be improved by taking the effects of stopping power into account as well as through the use of nanotechnology.
11/04/2011, Dr. Eric Deyo, Neutrinos and the OPERA experimentNeutrinos have recently made headline news with the release of experimental data that seem to indicate they can travel faster than the speed of light. In this talk, Dr. Deyo will discuss these recent findings and what this means for our current understanding of matter.
10/28/2011, Dr. Gavin Buffington, The Objective-C programming language and the Foundation frameworkAn overview of the Objective-C programming language and some of the iOS frameworks will be presented. The development of (very) simple iOS apps will be demonstrated. Some knowledge of a computer language like C, C++ or java and concepts of object oriented programming is assumed. There will be a discussion of potentially useful apps for teaching undergraduate physics. Bring your Mac (with Xcode and the iOS SDK installed) if you would like to follow along and create these apps for yourself.
10/21/2011, Dr. Jack Maseberg, Spin-polarized electronsA brief overview of the spin property of electrons will be presented. Various technologies for creating spin-polarized beams will be reviewed. Finally, we will focus on some specific physics experiments which utilize spin-polarized electron beams.
10/14/2011, Dr. Kent Rohleder, Giving a good presentationAs scientists, we must be able to effectively communicate our thoughts and ideas. This often requires us to present work we have done to our peers or to the public. Public speaking can be difficult, but presenting technical material has its own set of challenges. In this talk, Dr. Rohleder will give advice and techniques for delivering a good technical presentation.
09/30/2011, Dr. Kayvan Aflatooni, The Kapitza-Dirac effectOver the past 80 years, physicists have theorized, searched, and experimentally observed the complementary particle-like and wave-like nature of matter that has become a foundation of quantum mechanics. The Kapitza-Dirac (KD) effect, diffraction of electron-waves by light, is one such Wave-Particle Duality aspect that was only recently observed. This is now the 10th anniversary of the “Observation of KD effect” Nature publication, and we will look at the historical background, the current search and achievements, and the future of matter waves and matter optics.
09/23/2011, Justin Maughan, The effects of annealing on BaFe2-xCoxAs2A brief introduction to iron-pnictide superconductors will be given, followed by a discussion of the methods used to grow, harvest, anneal, and test BaFe2-xCoxAs2 superconducting crystals. We show that annealing at 700 ºC and 800 ºC for 1, 2, and 4 weeks can raise the onset of the critical temperature Tc. Comments will also be made regarding the summer REU experience.
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