Joseph R. Gladden        

Associate Professor of Physics, Director of NCPA, University of Mississippi, NCPA 2005, 662-915-7428, jgladden AT olemiss.edu


Gladden Head Shot

Research Overview


Resonant Ultrasound Spectroscopy

RUS is an elegant and efficient method of obtaining the full elastic tensor of a crystalline material. Elastic constants are a sensitive probe into the atomic environment and so provide useful information about phase transitions. Our group specializes in high temperature and hydostatic pressure RUS measurements and analysis of thin films deposited on a substrate. Current materials we are investigating are novel thermoelectric compounds such as silicon germanium, Zintl phase materials, PbTe, and LaTe and the charge order transition in transition metal oxides.

Wormlike Micellar Materials

Wormlike micellar fluids are simple mixtures of surfactants, organic salts and water which self-assemble into rich set of structural phases depending on concentration and temperature. Sometimes called "living polymers", these structures are loosely bound, can break apart under shear flow and recombine (self-heal). In the summer of 2007, we published a PRL paper reporting flow and fracture dynamics of a cylinder moving through a highly concentrated wormlike micellar material. Currently we are studying shear wave propagation in these highly viscoelastic materials as concentration, temperature, and acoustic pulse power are varied.  The birefringent optical properties of these fluids allow us to use novel laser based methods to track shear pulses.

Continuum and Granular Dynamics

In recent years we have studied a number of interesting mechanical systems including dynamic buckling of thin beams [PRL] and normal modes of vibration of heterogeneous nanostructures such as single and multiwall carbon nanotubes [JAP]. We are also beginning a study of dynamic instabilities in granular systems subject to fluidized vortical flow. These studies use numerical simulation and experimental methods such as particle image velocimitry (PIV) to better understand critical phenomenon in these unique systems.

Teaching


Scientific Computing (Phys 630)

I have designed a new type Scientific Computing course which is aimed at a broad spectrum of advanced undergraduates or beginning graduate students from a range of disciplines including Physics, Chemistry, Biology, and Mathematics. The course teaches fundamental concepts which are common to all scientific fields such as numerical derivatives and integration, regression analysis, graphical representation of data, and systems of ordinary differential equations. As time allows, we also have covered more advanced topics such as concepts in parallel computing. I have found the Python programming language to be a good medium for the course.

Advanced Classical Mechanics (Phys 709)
This graduate level course in classical mechanics introduces students to the core mathematical tools for many areas of theory - Lagrangian and Hamiltonian approaches.  The first semester focuses on collections of point masses, rigid bodies, rotations, and oscillating systems.  The end of the coarse brings us to the jumping off point for the foundations of quantum mechanics.

Introductory Physics (Phys 213/214)

An algebra based course primarily for pre-med students. I taught this course 2005-2010. (Physics 213/214)
Calculus based Engineering Physics. I have taught this course from 2010 - 2012. (Physics 211/212)

Physical Theory (Phys 303)

A calculus based course designed to as a bridge for students who have completed the algebra based sequence and have decided to become physics majors. (Physics 303)

Physics MCAT Review

Here is a link to the lecture slides for my Physics MCAT review session given Feb. 27, 2011. The file is intended for participants only and is password protected. If others would like access to the slides, please email me at the above address.

iPad in the Classroom
Here are some slides I presented during Educational Technology Week and TACIT Training on the UM Campus on using the iPad for teaching related activities.� Mostly Tips and Tricks and some handy apps.
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