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Otto Hunt
Works at Imagine What Could Be
Attended Grossmont High School
Lives in Oceanside, CA
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Otto Hunt

Discussion  - 
 
I am designing a high-frequency bench-top, electromagnetically-driven shaker. I need to sense the amplitude and phase of vibrations at various points to aid in the design process. I need a small, light-weight sensor that will operate from 1 kHz to 100 kHz. I know there are small piezo acceleration sensors, but they cost a couple of hundred dollars typically, and they benefit from a pre-amplifier (extra wires and power). Searching the 'net has turned up nothing else.

So, I am leaning in the direction of sensing velocity instead of acceleration. I am sensing periodic vibration, after all. If a velocity signal is differentiated (not hard) I will get acceleration. A cylindrical coil with a magnet inside that can stay still, due to inertia, while the coil moves with the shaker might do this. And it would have a low-impedance output. I can then differentiate this on an external circuit board for analysis.

Any thoughts?
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Otto Hunt

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I just discovered the potent anti-depressive effects of holy basil. I stuck the references in this blog post:

http://amateur-attempt-at-preventive-health.blogspot.com/2013/12/depression.html

I have been taking 30 mg of Remeron (mirtazapine) as a sleep aid. Remeron's main claim-to-fame, though, is as a potent anti-depressant. That I felt the effects of holy basil on top of Remeron speaks volumes.
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Otto Hunt

Popular Science  - 
 
Ions dissolved in water affect that water 10,000 times more than previously thought!

Dissolving ionic salts in water is a pretty common process. So why did it take until now to notice this? Are these people the first to carefully measure the force of removing a thin plate from a beaker of water?

Hydrogen bonding has a strong effect on surface tension, which is probably the same as the "surface resistance" mentioned here. And there are lots of other ways to measure surface tension.

This makes me wonder what other common effects are "10,000 times more than previously thought"?
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+Johnathan Chung If every voter researched the issues like the way you looked into this article, I feel like we would be living in a much better country right now.
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Otto Hunt
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Discussion  - 
 
Alexithymia is probably why my emotions surprise me so often.
 
'I care for you,' says the autistic moral brain - Is it true that autistic people are cold and feel no empath? It is a pervasive stereotype, but when analyzed through the lens of science, reality turns out to be quite different. According to a study at SISSA carried out in collaboration with the University of Vienna, when autistic people are placed in "moral dilemma" situations, they show an empathic response similar to the general population. The myth of coldness in autism is likely due to...
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Otto Hunt

Popular Science  - 
 
As relativity is to Newton's laws, something new is to the standard model. Is this result pointing to that something new?

The latest news from the LHC:
It looks like the LHC may have found a surprise massive particle that gives a glimpse into a better – and entirely unexpected – theory of reality
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Not really. This is only a two or three sigma event. That means that there's a 1/50 to 1/300 chance it's fake, and I'm pretty sure the statistics already take that into account. Physicists have been fooled by those kinds of numbers int the past 
https://en.wikipedia.org/wiki/Oops-Leon
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Otto Hunt

Inspiration  - 
 
Wow! 5,127 vacuum cleaner prototypes. Now Dyson is almost a household word, but I am sure that, 15 years ago, he was no engineering slouch.
James Dyson isn't just about vacuums. The inventor is also a pioneer in wearable gadgets and green technology. Through his experiences, the entrepreneur learned the one person he needed to believe in his technology was himself.
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Haha, the title looks funny now that I read he was a supported of the Brexit. Anyway... off topic

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Otto Hunt

Ask the Community  - 
 
I would like to get an opinion about the iron-Alzheimer's connection. Given that excess iron is found in (dead) brains of Alzheimer's patients:

http://neurosciencenews.com/neuroscience-alzheimers-iron-4360/

And noting also that heme iron, from, mostly, red meat, is taken up by the body at at constant rate, regardless of iron status:

http://drhoffman.com/article/iron-deficiency-and-toxicity-3/

Might red meat be an Alzheimer's culprit?
Summary: A new technique using phosphorus boosts the visibility of iron in the brain.Source: UTS.It’s an unfortunate fact that the Alzheimer’s brain gives up most of its chemical secrets o
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Anytime brothers. Just mention me.
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Otto Hunt

Ask the Community  - 
 
Having struggled with organic chemistry, I have a question:

Acetylated tau, mentioned here:

https://www.newscientist.com/article/2082820-toxic-form-of-tau-protein-foils-memory-formation-in-alzheimers/

and here:

https://www.sciencedaily.com/releases/2015/03/150324084339.htm

has become the focus of medical investigation, replacing a previous emphasis on hyperphosphorylated tau, mentioned here:

http://www.news-medical.net/life-sciences/What-are-Tau-Proteins.aspx

and here: 

https://www.sciencedaily.com/releases/2015/03/150324084339.htm

Acetylated tau depletes levels of KIBRA, with disastrous results.

There a lots of ways to inhibit hyperphosphorylation of tau:
exercise, via AMPK:

http://jap.physiology.org/content/111/5/1380

dietary folate:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2688404/

http://www.ncbi.nlm.nih.gov/pubmed/21860088

low-dose lithium:

http://eurekamag.com/research/008/962/008962440.php

promoting hyperphosphorylation of tau is:
a high methionine diet:

http://www.jneurosci.org/content/27/11/2751.full.pdf

obesity and insulin resistance:

http://bmcneurosci.biomedcentral.com/articles/10.1186/1471-2202-15-111

http://www.sciencedirect.com/science/article/pii/S0969996114002460

brain injury:

http://www.sciencecodex.com/phosphorylation_of_tau_protein_in_rats_subjected_to_cerebral_ischemiareperfusion_injury-129343

and dietary aluminum:

http://www.osti.gov/scitech/biblio/5438000

http://www.ncbi.nlm.nih.gov/pubmed/8270765

My question is: are the mechanisms (dietary and lifestyle) that promote and inhibit hyperphosphorylation of tau likely also to promote and inhibit acetylation tau?
Study in mice provides a mechanism for how the notorious protein stops neurons from strengthening their connections – and how we form memories
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Indirectly, diet and lifestyle could affect acetylation of proteins, for example by increasing the pool of acetyl donors
(http://www.cell.com/cell-reports/fulltext/S2211-1247(15)01454-0)

or by altering expression of enzymes that regulate acetylation (http://clinicalepigeneticsjournal.biomedcentral.com/articles/10.1186/s13148-016-0188-3). 
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This is really  "out there" : Scientists acting as DNA archeologists dug through human DNA, recognized part as fossil-like, then concluded by describing the promisuous antics of an ancient retrovirus. 
The global spread of an ancient group of retroviruses that affected about 28 of 50 modern mammals' ancestors some 15 to 30 million years ago has been revealed by a team of scientists.
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Nämäkin voi osoittautua pandemiaksi.
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Otto Hunt

Science  - 
 
This "tunable variable stiffness" is a solution looking for a problem. It seems to me that an enterprising maker or product designer could use this material property from scratch.
 
Negative Stiffness: New structures to control vehicle dynamics. 

Negative stiffness is a really weird concept, one that is generally outside of our every-day experience, but it's really easy to reproduce for yourself with a thin beam (in the video you'll see my colleague Chris use a ruler).  Being an unstable property of buckled structures, most people have actually experienced the phenomenon when playing with a Snapple cap (click-click). 

The concept of negative stiffness has been hidden in plain view in every freshman physics book, but hardly anyone has noticed (why would k in Hooke's law be negative?) yet it has surprising implications (e.g. you can combine negative and positive springs in series to make infinite stiffness). Before our work, no right-thinking engineer would ever have tried to use the idea in a real application because of the nonlineariities, but we've made it work for ultracompact easily tunable vibration isolators. 

In the application shown in the video below, by putting positive and negative stiffness springs in parallel we can get quasi zero stiffness. This enables isolation from shocks and vibrations in a much more compact package than a single low-stiffness spring alone. What is far less obvious is that we don't give up on load carrying capability. Where soft springs would just collapse from a sufficiently large load, our system can be engineered to bear that load without compromising low stiffness. That low stiffness in turn enables isolation from vibration and shock. Because it is switchable we get on demand shifts in stiffness just like mammalian musculoskeletal systems but about 100x better. 

The work was just published in Science Advances:  http://advances.sciencemag.org/content/2/2/e1500778
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Stick it on a bicycle? No, seriously.
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Otto Hunt

➥ Hackerspaces/Makerspaces  - 
 
So, when are the HaLow chips hitting the market, that's what I wanna know!
A new Wi-Fi standard called 'Wi-Fi HaLow' has been officially announced by the Wi-Fi Alliance , promising to connect devices over longer ranges while using less power than existing Wi-Fi networks. HaLow (pronounced 'Halo') operates in the 900MHz...
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Have him in circles
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Electrical Engineer, inventor
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  • Imagine What Could Be
    Electrical Engineer, inventor, present
  • Microwave Specialty, Spectral Dynamics, Wavetek, SAIT, Litton Data Systems, Northrop Grumman
    Microwave technician
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Currently
Oceanside, CA
Previously
Eau Claire, WI - Manitou Springs, CO
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Inventor and health freak (http://amateur-attempt-at-preventive-health.blogspot.com/).
Introduction
Married, one grown son.
I am an inventor (patent 5,495,143) working on a new product: a dog walking collar that vibrates when the dog pull excessively on the leash.

A few other blogs that I occasionally enhance:



Bragging rights
I can fix almost anything, and I have a resting pulse rate of 45.
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Education
  • Grossmont High School
    Rowdiness
  • Grossmont College
    Music
  • Mesa College
    Engineering
  • San Diego State University
    Electrical Engineering
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Paul Hunt
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