Cosmic Funnies
styofa doing anything
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TVSTRANGERTHINGS
@theartofmadeline
One Nice Bug Per Day
đȘŒ
AnasAbdin
todays bird
Kiana Khansmith
if i look back, i am lost
ç„æ„ / Permanent Vacation
tannertan36
occasionally subtle
Peter Solarz
Love Begins
Misplaced Lens Cap
tumblr dot com
he wasn't even looking at me and he found me
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@fontralculus
Whoops, havenât posted anything in over two months.
Iâm okay, no worries, I was just busy grooming this completely random guy who is in no way, shape or form my new boyfriend.
Yes. I ruffled his hair for over two months straight.
⊠:U
Wat up, tumblr
Love you too. :3
wearing my own shirt idgaf
The face of a Chris Christie fanboy.
someone who has never watched kill la kill before explain what is going on here
A crazy naked man is committing armed robbery with a glue gun at a swimming pool. The girl he's aiming at can't believe this stupid shit and the other one on the bottom right saw his junk and is turning away in disgust.
dude: way if we pees form buts
#fOR A SEC I THOUGHT THAT WAS MIMICING THE SONIC 06 TITLE IM
"Every single person at the BBC is thus a corrupt, lying, thieving, child raping, pensioner murdering nazi parasite who deserves a fair trial followed by hanging"
Garfielf at hsi best
This describes my experience with MGR perfectly.
If every abstract was written like this, my job would be so much easier.
Stupid Random Ideas for Science that I've Had when I was Younger
Create an artificial human brain from scratch.
Cure cancer by use of a retro-terminating virus "programmed" in a way to infect cancer cells so that they return to normal cells. The virus will then die as per the 'retro-termination' description.
Create a suit using carbon nanotubes as synthetic muscles and use it for stupid shit like punching through concrete and jumping off buildings since, in aerogel form, carbon nanotubes become denser under stress.
Use the metal-insulator-transition and tunable properties of vanadium dioxide to create an isotropic super-solar-cell and solve the energy crisis while making oil companies bankrupt.
Using a modified non-local means image denoising algorithm in receiver antennas to make signal quality in wireless transmission to be near-flawless and vastly increase something like cellphone reception.
What is the feasibility of any of this? Absolutely none. So what was the point of this post? While none of these ideas worked, having a desire to create any of these things has given me drive to learn a lot more about all of the above subjects. Point is, knowing why certain things can not have the applications you think up will teach you more about important scientific concepts and properties. Most of my work involves a lot of trial and error and while math and science is great because they are as solid and objective as subjects can get, a good chunk of the work people do in these fields involves errors and trying to fix said errors and then finding out their problem space or hypothesis doesn't work because the fix invalidates it.
Hell, it's amazing to me how many different variations the model of the atom had to go through before we got something even close to right. And, even better, how much controversy there was surrounding such models at the time. Even now, the model isn't complete.
Anyway, that's as much as I'll go into the whole "SCIENCE RULEZ LOL" bullshit (that is so unfortunately prevalent on the internet). My next post will contain something with actual substance. Of course it's not like anyone actually reads this blog anyway but eh, c'est la vi.
I am a hypocrite
I figured this out whenever I heard two people talking about asteroid trajectory simulation in the dorkiest fashion possible and I wanted to scream "NEEEEERDS" at the top of my lungs... then I remembered I am in grad school studying optics.
this is probably the only sex gif i will every reblog, because for some reason i feel like itâs more than just sex. i donât know if itâs how theyâre actually looking at one another or the way they canât get close enough. heâs actually looking at her like a person and not just a sex object.Â
but then again, it could be all in my head. i mean, this is how i would want it to be. but thatâs just me.
Iâm about 97% sure weâre not seeing the same gif
FUCKING MAGNETISM, HOW DOES IT WORK? (Intro notes pt. 2)
Magnetic materials are those that exhibit magnetic polarization when they are subjected to an applied magnetic field. The phenomenon is represented by the alignment of magnetic dipoles of the material with the applied magnetic field. There, that is how fucking magnets work. ICP can now retire.
The magnetic flux density across the slab from my previous post is increased by the presence of the magnetic field so that the magnetic flux density at any interior point of the slab is given by:
Where Ïm is magnetic susceptibility.
Where ÎŒs is static permeability.
Within the material, a bound magnetic curent density Jm is induced that is related to the magnetic polarization vector by
Where the units for Jm are in amperes per meter squared.
From this, we have the following relationship:
The bound magnetization current, Im flowing through a cross section So of the material can be obtained by using:
Currents, Conductors, and Conductivity
Assume electric volume charge density Ïv distributed in an infinitesmal circular cylinder of cross section area Îs and volume ÎV. The total electric charge ÎQ witin volume ÎV is moving in the 'z' direction with uniform velocity v0
As Ît approaches zero
The total current density is then given as:
This is ccalled the convection current density. This same current is present between the cathode and anode of vacuum tube technologies.
That's it for this year. Have a happy New Year and I'll see you all in 2014.
Advanced Electromagnetism Notes Material Properties Dielectrics, Polarization, and Permittivity
Dielectrics are materials whose dominant charges in atoms and molecules are bound negative and positive charges that are held in place by atomic and molecular forces and they are not free to travel. i.e. Dielectrics do not contain any free charges.
When external forces (fields) are applied, these bound negative and positive charges do not move to the surface of the material as in conductors, but their respective centroids can shift slightly in position relative to each other, thus creating numerical electrical dipoles.
The formation of electric dipoles is usually referred to as orentational polarization. For each dipole, their moment is given by:
Where Q is the magnitude of the charge and l is the distance/length of the dipole.
The total dipole moment is given by the following equation:
Where Ne is the electric dipoles per unit volume, Îv is total volume, and NeÎv is the total number of electric dipoles.
Electric polarization vector can be defined as the dipole moment per unit volume. Or in terms of an equation:
Where the P with the bar over it represents surface charge density which is bound. Within a volume an integral number of positive and negative pairs with an overall zero net charge must exist.
Assuming an average dipole moment of
The electric polarization vector can be written as:
Electric polarization for dielectrics can be produced by any of the following mechanisms.
Dipole or Oriental Polariziation: This polarization is evident in material that, in the absence of an applied field and owing to their structure, possess permanent dipole moments that are randomly oriented. However, when an electric field is applied these diples tend to align with the applied fields (polar.) For example, water is a good polar material
Ionic or Molecular Polarization: Evident in materials such as salt that posses anions (+ve) and cations (-ve) and that tend to displace themselves when an electric field is applied.
Electronic Polarization: Exists when an applied electric field displaces the electric cloud center of an atom relative to the center of the nucleus.
Dipole, polar, nonpolar:
If the charges in a material, in the absence of an applied electric field are averaged in such a way that anion and cation charges cancel each other throughout the material, then there are no individual dipoles formed and the total dipole moment and electric polarization vector are zero. However, when an electric field is applied, it exhibits a net nonzero polarization. Such a material is referred to as nonpolar material.
Polar materials are those whose charges in the absence of an applied electric field are distributed so that there are individual dipoles formed each with a dipole moment but with a net total dipole moment and electric polarization vector of zero. This is usually due to the random orientation of the dipole. Typical dipole moments are on the order of 10^-30 Coulomb-meters.
Materials that, in the absence of an applied electric field, posses a net dipole moment and electric polarization vector with a nonzero value are referred to as electrets.
When an electric field is applied to a nonpolar or polar dielectric material, the charges in each medium are aligned in such a way that individual dipoles with nonzero dipole moments are formed within the material.
When we see the material on a macroscopic scale, we can say the following:
On the lower surface, there exists a net positive surface charge density.
On the upper surface there exists a net negative surface charge density.
The volume density inside the material is zero because the positive and negative of adjacent dipoles cancel each other out.
In this figure, a DC source is connected and remains across two parallel plates separated by distance s. Half of the space between the two plates is occupied by dielectric and half is filled with air (i.e. free space.)
Assume five free charges on each part of the plates separated by free space. The same number appears on the part of the plates separated by dielectric material Because of the realignment of bound charges in dielectric material and formation of electric dipoles and cancellation of adjacent opposite charges, a polarization electric vector is formed within the dielectric material.
The net effect is that between the lower and upper surfaces of the dielectric there is a net electric polarization vector directed from the upper toward the lower surfaces, in the same direction as the applied electric field, whose amplitude is given by:
The electric flux density for free space is given by:
The electric flux density is related in the dielectric portion assuming free space is:
Where Ï is the electric susceptibility.
Where Δ_s is the static permitivty whose relative value Δ_sr is given by:
referred to as the relative permittivity (dielectric constant).
The index of refraction: n=âΔr
The dielectric constant of a dielectric material is a parameter that indicates the relative (compared to free space) charge (energy) storage capabilities of a dielectric material. The larger its value, the greater its ability to store charge.
Up next: FUCKING MAGNETISM AND HOW IT WORKS!
How does one be interesting? (Warning: do not read if you do not want to read stupid angst bullshit)
You know something? I've come to realize I'm an extremely boring person. My interests and hobbies are all things in which no one is interested, most of my days are spent reading textbooks or science journal articles. The rest of my time is spent playing videogames or doing work.
I used to be so less-boring. I'd go out and ski every weekend during winter, I'd play basketball with friends, I'd do something new every weekend like go to a bar I'd never been to before, I'd hang out with friends and just do fun things in general.
I have had zero luck in the dating realm especially with online dating sites, I have maybe one or two really good friends I hang out with regularly, whenever I'm given the chance to go skiing or doing some sporting activity I turn it down because I'm lazy, and most activities I do with friends consist of either online gaming or just talking on skype.
I also have a horrible day-dreaming problem. I keep fixating on fantasies of me being better than I actually am than actually being better than I actually am. It's gotten so bad it has been a serious hamper on my studying and work habits. How does one fix this?
I think that this topic is truly important. What do you think about it?
Source: Are stereotypes keeping women away from science?
Follow Francesca Mura on Pinterest
Rozlett just told us about this, pointing out that women face a lot of challenges going into STEM fields, something that makes it harder for women to enter these fields (either because they are told they cannot make it or they themselves think that).
So, itâs not about womenâs intelligence, itâs about misogyny. Iâm sure that more-female-logic wonât believe this though.
I tend to hesitate to identify as a feminist (due to the fact that it feels like I'm encroaching on territory that doesn't belong to me) but I do think it is important to recognize here this disparity. I really think we need more women in the STEM field and it is truly unfortunate many are being socialized or stigmatized against coming in here.
I work with two of the brightest minds in electromagnetism currently and they are both women, but the reason they got where they were is that they had to work extremely hard to outperform the men in their field. Both of them. Neither of them wouldn't be out-of-place teaching at MIT and I sometimes wonder, were society not as misogynist, if they would in fact be teaching there rather than being at my university.
Of course this is hypothetical and maybe they chose this route, but it doesn't change the fact that sexism in STEM academia is a serious problem that needs to be addressed.
I just wish I knew how to address it. Best I can do right now is just try to encourage more women to get in my field, but the usual response I get from anyone in general for that is: "hell no." Which bothers me because it feels like it's a problem I can't solve and I hate not being able to solve problems.
OKCupid in a nutshell.
Well... I uh... generated this thing in matlab. I shall call it... what the hell should I even call this?
