Posts

August 01, 2014

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1:40 AM | Math Notes: Cylindrical r Coordinate Value to Trace a Spherical r Dependent on z
OK, so that was quite the title.  I haven't done one of these in a while, but classes are about to start again and i figured I may as well get started deriving things again.  Plus, I had to do it for the can crusher magnet simulation code[1] for the experiment[3].  Here's what's really going on.  I have a Sage function that will give me the magnetic field in the z direction produced by a coil of wire that sits at z = 0 and a has a radius of 'rcoil'.  I'd like to know […]

July 31, 2014

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5:58 PM | Simulations! Everywhere Simulations! Lab Book 2014_07_31
Summary:Excuse a brief moment of frivolity please.  OMG, This is So *#($&#@ cool!!!OK, now that I've got that out of my system we can move on.  The can crusher simulator port from IDL to Sage is complete and it's working spectacularly well!  I was able to run simulations to find out what the temperature of the can would increase to due to the magnetic pulse.  I was also able to plot the magnetic field in a sphere around the pulisng coil to determine if the coil as […]
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3:40 PM | The Most Accurate Model Yet Of Jupiter's Bizarre Magnetic Field
It may look like a giant ball oozing with earthworms, but it's actually a simulation of Jupiter's massive and complex magnetosphere — a magnetic field that extends more than four million miles from its surface.Read more...
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2:30 PM | Microwaving Light Bulbs Is Genuinely Useful (And Entertaining)
I love finding new things to put in the microwave. Say, for instance, an incandescent light bulb, which can test your microwave for a number of issues, besides just looking awesome. Even a non-functioning bulb can work, so dig out the dusty old bulbs you have at the back of the closet. Read more...
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1:39 PM | How are neutron stars magnetic? (Synopsis)
“By allowing the positive ions to pass through an electric field and thus giving them a certain velocity, it is possible to distinguish them from the neutral, stationary atoms.” -Johannes Stark One of the simplest tenets of electromagnetism — the second of the fundamental forces ever discovered — is that charged particles are accelerated parallel to electric…
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7:11 AM | "Extraordinary Claims, The 0.000029% Solution" And The 38 MeV Boson AT ICNFP 2014
Yesterday I gave a lecture at the 3rd International Conference on New Frontiers in Physics, which is going on in kolympari (Crete). I spoke critically about the five-sigma criterion that is nowadays the accepted standard in particle physics and astrophysics for discovery claims. My slides, as usual, are quite heavily written, which is a nuisance if you are sitting at the conference trying to follow my speech, but it becomes an asset if you are reading them by yourself post-mortem. You can […]

July 30, 2014

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10:45 PM | Keeping lithium contained: new design allows for high energy-density anode in Li-ion batteries
Lithium ion batteries – they’re everywhere, and their name has become mainstream enough that non-scientists know they’re in our laptops and electronics.  These types of batteries are so popular because lithium boasts a high energy density and they don’t lose charge … Continue reading →

Zheng, G., Lee, S., Liang, Z., Lee, H., Yan, K., Yao, H., Wang, H., Li, W., Chu, S. & Cui, Y. & (2014). Interconnected hollow carbon nanospheres for stable lithium metal anodes, Nature Nanotechnology, DOI: 10.1038/nnano.2014.152

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9:38 PM | Quick Heads Up For Some Spooky Action At A Distance Talk
Late, late, late I am in getting this out to you, but I’m doing another webcast/podcast for Virtually Speaking Science today. I’ll be talking to my MIT colleague, David Kaiser, who is a physicist and a historian of science in our Science Technology and Society program.  He’s also an excellent popular science writer, and we’ll […]
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7:30 PM | This Ice Cream Changes Color When You Lick It
Spanish physicist Manuel Linares has developed a brand of ice cream that changes color when it experiences a change in temperature and comes into contact with saliva — but he's keeping quiet over how he came up with this delicious creation.Read more...
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7:07 PM | To Live And Die In Berkeley: Monitoring Schrodinger's Cat In Real Time
Schrödinger's cat is one of the famous examples of the weirdness of quantum mechanics   The thought puzzle is that you put a cat inside a box and make its life dependent on a random event, when does the cat die? When the random event occurs, or when you open the box?read more
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6:18 PM | Leak Detector Down but Not Out, Code Crusher Code Objectified! Lab Book 2014_07_29
Alternate Title:  How Could Something So Pretty be So Broken?SummaryIt finally became too cumbersome to work with the can crusher simulation code in script form.  the bulk of this morning was spent in meetings and reworking the can crusher code to be object oriented.  The object oriented refactoring was completed and tested and works great!  It’s now very easy to run multiple simulations and compare their results.  The next step is to write code that runs the […]
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4:02 PM | Cool Burning Flames Could Lead to Better Engines
A team of international researchers has discovered a new type of cool burning flames that could lead to greener, more efficient combustion engines.
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4:00 AM | The Age of Entanglement: When Quantum Physics Was Reborn
By Louisa Gilder Synopsis: In The Age of Entanglement, Louisa Gilder brings to life one of the pivotal debates in twentieth century physics. In 1935, Albert Einstein famously showed that, according to the quantum theory, separated particles […]

July 29, 2014

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11:32 PM | A miniature turbine with blades one atom thick
Micro-machines, as well as being an awesome video game, are also a glimpse into the future (maybe): Some people believe that tiny robots could one day revolutionise medicine, while others think they might destroy the world in a big blob of ‘grey goo’. While fully-fledged nanorobots are currently limited to fictional universes such as those…

Li J., Lina Zhao, Xingfa Gao, Yuliang Zhao & Ruhong Zhou (2014). Rotation Motion of Designed Nano-Turbine, Scientific Reports, 4 DOI: http://dx.doi.org/10.1038/srep05846

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9:35 PM | SageMath, Where Objects Rock and Scripts Don't
I moved the Sage simulation of the can crusher to an object oriented implementation today.  A few days ago,I was worried this might have been a bit of overkill and just a subconcious desire on my part to place the project in a code format I'm used to seeing things in.  I hit an example yesterday that convinced me otherwiser, and only a few short, OK,  and somewhat grueling, hours later, I had a much easier to use OO simulator. Prior to yesterday, my usage mode of the can crusher […]
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6:04 PM | Quantum Cheshire Cat: Scientists Separate A Particle From Its 'Grin'
In Lewis Caroll's novel "Alice in Wonderland", the Cheshire Cat could disappear but its grin remained.  Why? Who knows? Like dogs named Checkers and Esther Williams swimming pools, things don't always make sense. Scientifically, that cat was an object separated from its properties - it was a quantum cat. read more
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2:52 PM | Moving Crushed Can Walls! Lab Book 2014_07_28
Summary:I made the last few fixes on the can crusher code port from IDL to +Sage Mathematical Software System and the can wall is now moving in simulation.  For a refresher on what the can crusher does and why the wall moves in the first place, see the embedded can crusher video post below.  Graphs were created showing how the current through the driving coil varies with time when the can is allowed to move and when it is not.  The leak detector is still broken, work […]
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2:29 PM | Two More Mysterious Giant Holes Emerge In Siberia (Pictures)
About two weeks ago, I reported on a giant crater that appeared on the Yamal peninsula in Siberia. Well, while scientists are still trying to figure out what caused this first crater, two more have been discovered in Siberia. Crater of Antipayuta This crater was alo discovered on the Yamal peninsula, near the village of Antipayuta […]

July 28, 2014

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4:38 PM | The clearest essay on physics I have read: The beauty and clarity of Paul Dirac's prose
Paul Dirac was sort of the Ernest Hemingway of physics, only better. Both his equations and his prose were as tight, spare and to the point as Hemingway. But unlike the delightfully rough-hewn storytelling of Hemingway Dirac's creations were, in Freeman Dyson's words, "like perfect mathematical sculptures falling from the sky". While his elegant mathematics captivated other scientists and inspired awe, his translation of mathematical precision to his English could frustrate and baffle. Dirac […]
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2:00 PM | Sieving at the nanoscale: desalination of seawater through nanoporous graphene
Perhaps the most repeated words in the last few years when talking about graphene – since scientists Geim and Novoselov were awarded the Nobel Prize […] Read more The post Sieving at the nanoscale: desalination of seawater through nanoporous graphene appeared first on Mapping Ignorance. Related posts:Carnivorous plants inspire novel liquid repellent surfaces Superparamagnetic nanoparticles and the separation problem Carbon nanotubes to study neuron activity
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1:58 PM | The Fermi Alternative
Given the recent Feynman explosion (timeline of events), some people may be casting about looking for an alternative source of colorful-character anecdotes in physics. Fortunately, the search doesn’t need to go all that far– if you flip back a couple of pages in the imaginary alphabetical listing of physicists, you’ll find a guy who fits…
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9:02 AM | More On The Alleged WW Excess From The LHC
This is just a short update on the saga of the anomalous excess of W-boson-pair production that the ATLAS and CMS collaborations have reported in their 7-TeV and 8-TeV proton-proton collision data. A small bit of information which I was unaware of, and which can be added to the picture. read more
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5:00 AM | Smashing Physics: how we discovered the Higgs boson - podcast
The British physicist Jon Butterworth discusses his new book Smashing Physics, an insider's account of the discovery of the Higgs boson. Plus, the origins of life Continue reading...
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12:46 AM | Leak Detector Testing... Again Lab Book 2014_07_27
Summary:The leak detector stopped working correctly several weeks ago.  It didn't exactly depart his mortal coil so much as just stop being useful.  Sort of like a major league baseball catcher hunkered in a hockey goal.  It looks sort of like it has the right equipment, but it obviously incapable of performing it's tasks in any sort of meaningful way.  It boils down to this, the mechanical roughing pump is still pulling a vacuum that should enable the diffusion pump, […]

July 27, 2014

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6:17 PM | Holy Grail of Battery Design: A lithium anode
Technology has been racing forward at an ever increasing rate. Unfortunately, anyone who owns a smartphone will tell you that the battery life doesn’t match the advancements. That is probably […]

Liu N, Lu Z, Zhao J, McDowell MT, Lee HW, Zhao W & Cui Y (2014). A pomegranate-inspired nanoscale design for large-volume-change lithium battery anodes., Nature nanotechnology, 9 (3) 187-92. PMID: http://www.ncbi.nlm.nih.gov/pubmed/24531496

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6:17 PM | Holy Grail of Battery Design: A lithium anode
Technology has been racing forward at an ever increasing rate. Unfortunately, anyone who owns a smartphone will tell you that the battery life doesn’t match the advancements. That is probably […]

Liu N, Lu Z, Zhao J, McDowell MT, Lee HW, Zhao W & Cui Y (2014). A pomegranate-inspired nanoscale design for large-volume-change lithium battery anodes., Nature nanotechnology, 9 (3) 187-92. PMID: http://www.ncbi.nlm.nih.gov/pubmed/24531496

Citation
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6:17 PM | Holy Grail of Battery Design: A lithium anode
Technology has been racing forward at an ever increasing rate. Unfortunately, anyone who owns a smartphone will tell you that the battery life doesn’t match the advancements. That is probably […]

Liu N, Lu Z, Zhao J, McDowell MT, Lee HW, Zhao W & Cui Y (2014). A pomegranate-inspired nanoscale design for large-volume-change lithium battery anodes., Nature nanotechnology, 9 (3) 187-92. PMID: http://www.ncbi.nlm.nih.gov/pubmed/24531496

Citation
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6:17 PM | Holy Grail of Battery Design: A lithium anode
Technology has been racing forward at an ever increasing rate. Unfortunately, anyone who owns a smartphone will tell you that the battery life doesn’t match the advancements. That is probably […]

Liu N, Lu Z, Zhao J, McDowell MT, Lee HW, Zhao W & Cui Y (2014). A pomegranate-inspired nanoscale design for large-volume-change lithium battery anodes., Nature nanotechnology, 9 (3) 187-92. PMID: http://www.ncbi.nlm.nih.gov/pubmed/24531496

Citation
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6:17 PM | Holy Grail of Battery Design: A lithium anode
Technology has been racing forward at an ever increasing rate. Unfortunately, anyone who owns a smartphone will tell you that the battery life doesn’t match the advancements. That is probably […]

Liu N, Lu Z, Zhao J, McDowell MT, Lee HW, Zhao W & Cui Y (2014). A pomegranate-inspired nanoscale design for large-volume-change lithium battery anodes., Nature nanotechnology, 9 (3) 187-92. PMID: http://www.ncbi.nlm.nih.gov/pubmed/24531496

Citation
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5:30 PM | Skepchick Sundaylies: Suggestive Logos, Un-Christian Christians, Mom’s Purse, and the Medical Model of Disability
Categories: Meta StuffTags: AirbnbComeniusDBTdisabilityeducationEscepticagraphic designgrounded parentsimmigrationMad Art Labmedical model of disabilitymental healthmusicParentingpedagogyphysicsReligionresearch fundingSamaritansschool of doubtSkeptabilityspiritualityswaddlingTeen SkepchickThe Great DidacticSunday Funny: Chaos (via xkcd) Teen Skepchick The Physics Philes, lesson 107: The Subjective Side of Physics Mindy explores the physics of sound. DBT Skills: The Benefits of Mindfulness […]
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