DAVE DERISO

Project 1000x1000. This is a project I worked on for making polymer fibers for N95 masks (here is the ArXiv paper). The project proposes a distributed manufacturing process (rotary jet spinning) as a scalable method to enable manufacturing of N95 grade filter material (a nano-fiber porous mesh). Current manufacturing of N95 grade filter material is centralized and relies on a melt-blown process which can not scale beyond one or two million masks/day per factory. We provide an alternative approach of a medium scale manufacturing (filter material for 10,000 masks per day) and if replicated by 1000 small businesses and groups across the country, would produce enough material for one to ten million masks per day. The photo is of me and my friend, who first-authored the paper, holding the cotton candy-like fibers produced by this method.

Check out my most recent paper on ArXiv about aligning two time-series together using a new method of Dynamic Time Warping (DTW). Code will be available on Github soon. The top plot shows two signals that we seek to align by warping time. The middle plot shows the mapping between the two signals defined by the time warping function, phi. The bottom plot shows how the two signals look when we compose signal x with the time warping function; it aligns beautifully with y! You can also do this with groups of signals. All of this (and more) is in the paper.

Still life of bearings for the new robot

add this to ~/.bash_profile and you should be good to go alias r='/Library/Frameworks/R.framework/Resources/R’

I've already found several timing issues with my code because of this setup. It saves time and money. Happy hacking :)

Thanks Bryan! Good luck with your project!

The force is strong in you. You did not create it, your computer did, because it knows how badly you want to do forest & waterside history research. Boom, you're a Jedi.

Thanks for writing so many kind notes, you really made my day. I'm SO SORRY I haven't responded--I for some reason had the alert function off so I didn't know people were sending me stuff. I just checked my Tumblr messages, and they were just sitting there like "where you been bro?" Anyway, I get alerts now and I'll write back :) Party hard, Dave

...all that time I spent studying the San Francisco gold rush, and building dioramas out of shoeboxes should have been spent on career development! Where were the mentors?! I needed to be starting a hedge fund, not playing in hedges! And with my paltry kickball skills, I should have been focusing on team and process optimization. What was I doing?!

The radio frequency basically uses resonance to excite protons spinning at a certain frequency. That frequency is determined by the magnetic field the proton is in. One the proton is excited, it spins faster and faster until it tips on its side like a top. This is called precession. So, when the proton spins on its side, it creates this oscillating magnetic field in the “transverse plane,” a direction orthogonal to the receiver coil. Basically this becomes like a magnet going inside a coil, which as Faraday proved, induces a current in the coil. But it takes a lot of these protons spinning on their side together, all in the same phase, to make a net signal strong enough to induce a current in the receiver. When they spin out of phase the net magnetic field in the transverse plane decreases, causing the signal to decrease. This can happen when theres local inhomogeneities in the machine’s magnetic field, bone tissue interfaces, or paramagnetic effects of deoxygenated hemoglobin—the latter of which powers the BOLD signal. Sorry to answer so late, I just saw this!

No problem, glad to help :)

No problema amigo, acabo de leer este 

You can hack it. Just start pressing buttons and clicking on things. If you break something, just re-download and try, try again.

Here, this should help with your calendar woes.

Hey Joe, No problem, glad you like it :)

Thats because theres nothing up yet. Now is your chance to make history and post something mind blowing :)