Teaching

I am always on the lookout for new courses to contribute to the physics curriculum, as well as ways to improve our current offerings. (The motivated and engaged student population at Sarah Lawrence is fortunately a great audience for testing out new teaching techniques!)

I fully ‘flipped’ the classroom for my general physics courses this past year, with great success. I plan to add in more computation and further developing the labs this year. After a successful launch of my workshop-based “Time to Tinker” course, I am currently designing an advanced lab course to be taught in Spring 2020 called “Resonance and Its Applications”.

My current courses for the 2019-2020 academic year are:

  • Introductory Mechanics (Fall)
  • Modern Physics (Fall)
  • Introductory Electromagnetism (Spring)
  • Resonance and Its Applications (Spring)

Previous courses:

  • It’s About Time (First-Year Seminar)
  • Chaos
  • Time to Tinker (Workshop-style course)

Click here for course descriptions.

Research

3D Printing Permanent Magnet Gradient

Implementing 3D printed gradients for use in low-cost magnetic resonance imaging.

3D Printed Linear Actuator

3D Print designs for a linear actuator to discretely move NMR sample tube.

3D Printing Improved NMR Mandhalas

Information towards creating a strong, homogeneous magnetic field and linear gradient for imaging using a 3D printer and permanent magnets.

3D Printing NMR Mandhalas

Information on creating NMR Mandhalas for a strong, homogeneous magnetic field using a 3D printer and permanent magnets.

Recent Posts

More Posts

(Written by Jonathan Sheppard) Intro This summer the team took the previous year team’s RF probe design and both updated and upgraded it, in an attempt to optimize its functions. As with last year’s design, we used the text Experimental Pulse NMR: A Nuts and Bolts Approach by Eiichi Fukushima and Stephen B. W. Roeder as a guide. The main sections used will be noted throughout this post. As noted in the previous post, below are some general guidelines on the inductor coil specifications (from the section “V.

CONTINUE READING

(Written by Jonathan Sheppard and Aaron Conover) This summer, Jon Sheppard and Aaron Conover joined Merideth Frey’s physics research team through the Sarah Lawrence Summer Science Internship program. Last summer, the team focused on setting up the new TeachSpin equipment and optimizing the Halbach Mandhala design. They were successful in both endeavors. Thus, this summer, the attention has been on designing and creating a Radio Frequency transceiver and an easily manipulated gradient field (while also attempting to optimize all magnetic fields even further).

CONTINUE READING

This work was a follow-up to the work discussed in the previous post from 2018 on optimizing positions of magnets in the NMR MANDHALA based on a close reading of of Soltner and Blumler’s 2010 article “Dipolar Halbach Magnet Stacks Made from Identically Shaped Permanent Magnets for Magnetic Resonance”. There the dipole approximation is used for each cubic magnet in order to optimize magnet position to take into account inhomogeneities in the magnetic moments of the magnets used in the Mandhala (see ‘Variation of Magnet Properties’ section of article).

CONTINUE READING

Selected Publications

Here we demonstrate how to use the quadratic echo pulse sequence to carry out three-dimensional MRI of the phosphorus (31P) in ex vivo bone and soft tissue samples.
Proceedings of the National Academy of Sciences

Here we discuss an approach for reconstructing multidimensional nuclear magnetic resonance (NMR) spectra and MR images from sparsely-sampled time domain data, by way of iterated maps. This method exploits the computational speed of the FFT algorithm and is done in a deterministic way, by reformulating any a priori knowledge or constraints into projections, and then iterating.
Journal of Magnetic Resonance

Recent & Upcoming Talks

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