APOD and General Astronomy Discussion Forum
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Won't do you any good, I'm afraid. The molecules aren't polar, and aren't going to interact meaningfully with a magnetic field, especially not a static one.aristarchusinexile wrote:Harry! Exellent idea. I also just discovered I might be able to boost my moped's miles per gallon by placing a strong magnet near the combustion chamber's air-fuel intake port .. the field allowing gas and air molecules to mix more efficiently.
My thought exactly! For a mix of air-fuel to react in a magnetic field it must be ionise and if it is ionise then it mean the combustion is happening outside the combustion chamber. Not good. It's a good thing that the mix aint ionise. And the metal all around (Engine) deviate the magnetic field also.Qev wrote:Won't do you any good, I'm afraid. The molecules aren't polar, and aren't going to interact meaningfully with a magnetic field, especially not a static one.aristarchusinexile wrote:Harry! Exellent idea. I also just discovered I might be able to boost my moped's miles per gallon by placing a strong magnet near the combustion chamber's air-fuel intake port .. the field allowing gas and air molecules to mix more efficiently.
No, this is not correct (afaik). Look up buddah tale in his "gay science".aristarchusinexile wrote:From what I understand, Nietzsche wrote 'God is dead' as a commentary on the lack of love in his society.
Dense z-pinch plasmas initiated from a single 25-100 μm diam aluminum wire using a 100-350 kA, 100 ns current pulse have been studied with <=1 ns time resolution. Rapid unstable expansion of a coronal plasma formed around the wire was observed with a subnanosecond pulsed nitrogen laser, while a dense core, which expanded more slowly and stably, was observed with 1-2 ns x-ray backlighting pulses. The core contained most of the initial wire mass, but there appeared to be little or no current flowing in it.
The experiments are just the tip of the icebergAs a result of advances in fast pulsed-power technology and cylindrical load fabrication, the Z pulsed-power accelerator at Sandia National Laboratories drives currents approaching 20 MA with a rise time of approximately 100 ns through cylindrically-symmetric loads (typically a cylindrical array consisting of a few hundred wires) to produce plasma densities in excess of 0741-3335/41/3A/011/img21, x-ray output energies approaching 2 MJ, radiation pulses as short as 4 ns and peak x-ray powers as high as 0741-3335/41/3A/011/img22. More than 15% of the stored electrical energy in the Z pulsed-power accelerator is converted into x-rays. The plasma pressures at peak compression are several TPa with electron temperatures that can exceed 3 keV at containment magnetic fields exceeding 1000 T. Depending on the atomic number and composition of the imploding plasma, these z-pinches can be tailored to produce intense sources of thermal x-rays, keV x-rays or neutrons. Although applications of these x-ray sources have included research in radiation material interaction, equations of state, opacity, astrophysics and x-ray lasers, the principal focus of the present research is to use them for indirect-drive inertial confinement fusion (ICF).
For someone who is said not to have believed in God, he sure talked about him a lot. (From Nietzsche Quotes)makc wrote:No, this is not correct (afaik). Look up buddah tale in his "gay science".aristarchusinexile wrote:From what I understand, Nietzsche wrote 'God is dead' as a commentary on the lack of love in his society.
andAbstract: Coronal loop emission profiles are often of remarkably constant width along their entire lengths, contradicting expectations based on model coronal magnetic field strengths decreasing with height. Meanwhile Paul Bellan has produced a theoretical model in which an initially empty, twisted force-free loop, on being filled with plasma via upflow at each foot point, in the absence of significant gravitational effects, forms a narrow, filamentary loop of constant cross-section. In this paper, we focus on equilibrium states that include stratification by uniform gravity while retaining the effects of magnetic field twist. Comparing these with related force-free equilibria, it is found that injection of low-$\beta $ plasma under coronal conditions is not likely to change the shape of a loop significantly. These linear equilibria apply to the interiors and boundaries of loops only, with external influences modeled by boundary total pressures. The effects of total pressure balance with surroundings and of gravitational stratification are to inhibit the pinching of a loop to a constant cross-section. Only if the plasma $\beta$ were high enough for the plasma to reconfigure the external field and the hydrostatic scale height much greater than the loop size could the final state have nearly constant cross section. We do not expect this to occur in the corona.
Jets small or large have similar origin via a pinching of magnetic fields. The question is why do small jets fizzer off and larger jets are found to go for millions of years in one direction. How do they keep their stability. If the origin was around the disc of a black hole, its stabilty would be very weak. If the origin was from a combination of the core and the dics, maybe a stronger stabilty. These I think are critical to research for they play an important part in recycling matter from degenerate to normal matter.Abstract: Extragalactic jets are inferred to harbor dynamically important, organized magnetic fields which presumably aid in the collimation of the relativistic jet flows. We here explore by means of grid-adaptive, high resolution numerical simulations the morphology of AGN jets pervaded by helical field and flow topologies. We concentrate on morphological features of the bow shock and the jet beam behind the Mach disk, for various jet Lorentz factors and magnetic field helicities. We investigate the influence of helical magnetic fields on jet beam propagation in overdense external medium. We use the AMRVAC code, employing a novel hybrid block-based AMR strategy, to compute ideal plasma dynamics in special relativity. The helicity of the beam magnetic field is effectively transported down the beam, with compression zones in between diagonal internal cross-shocks showing stronger toroidal field regions. In comparison with equivalent low-relativistic jets which get surrounded by cocoons with vortical backflows filled by mainly toroidal field, the high speed jets demonstrate only localized, strong toroidal field zones within the backflow vortical structures. We find evidence for a more poloidal, straight field layer, compressed between jet beam and backflows. This layer decreases the destabilizing influence of the backflow on the jet beam. In all cases, the jet beam contains rich cross-shock patterns, across which part of the kinetic energy gets transferred. For the high speed reference jet considered here, significant jet deceleration only occurs beyond distances exceeding ${\cal O}(100 R_j)$, as the axial flow can reaccelerate downstream to the internal cross-shocks. This reacceleration is magnetically aided, due to field compression across the internal shocks which pinch the flow.
So, you use c to determine APD from AMD, then you use that result to determine c? I'm impressed, so simple and so circular.JimJast wrote:... c must be equal sqrt(3 x avarage preasure density / average mass density). We know that mass density of the universe is 6x10^{-27} kg/m^3 and speed of light is 3x10^8 m/s so we may figure out the average preasure density being (9x10^16 x 6x10^{-27})/3 = 1.8x10^{-10} N/m^2 and so it together with the density of mass determines the speed of light in the universe.
To everyone human, Astrol.astrolabe wrote:Hello aristarchusinexile,
And this would apply to.................whom?aristarchusinexile wrote:I suggest that we often do not recognize what we see because we have never seen it before, or because of what our normal associations are, or because of what we want to see.
Or are the galaxies separate from the void, and what is thought of as being one big Bootes void really two or three or four or more smaller voids?Chris Peterson wrote:Inside the Boötes Void which is under discussion, there are at least 60 galaxies alone. So while the average density is very low compared with other parts of the Universe, it is far from empty.Doum wrote:Just dont forget that void is so big that a few billion stas being inside it, it will still not be visible to us because we can't detect or see a single star in there for now. So what i am telling you is that the void is fill with matter but it is very disperse compare to the galaxies abondances we live in.
My opinion, in case you missed it Doum, is that the voids are completely empty of matter, being filled with anti-gravity .. possibly anti-matter?Doum wrote:Hi Aricharchusinexile,
Just dont forget that void is so big that a few billion stars being inside it, it will still not be visible to us because we can't detect or see a single star in there from here. So what i am telling you is that the void is fill with matter but it is very disperse compare to the galaxies abondances we live in. Gravity create the void naturaly and it is also logical for it to exist. The void have nothing magic in it. It's a natural phenomenon. No mystery there.There are still matter in there but we dont see it with the today's tool. It is my opinion.
JimJast wrote:You must have overlooked the fact that out of 3 variables (speed of light, mas density, and pressure) we we don't know only the pressure so I just calculated only this one. I didn't calculate the speed of light since we know it. And the nature determines it possibly from the same relation that I used but having as given the mass density and the pressure. Hope it helps.
JimJast wrote:... c must be equal sqrt(3 x avarage preasure density / average mass density). We know that mass density of the universe ... and speed of light ... so we may figure out the average preasure density ... and so it together with the density of mass determines the speed of light in the universe.
Does that wink mean 'Dolphins are sexy'?astrolabe wrote:Hello aricharchusinexile,
AH! Nevermind.aristarchusinexile wrote:An example: someone sent me an email one time .. an illustration of dolphins .. but all I could see was a naked woman. But for sure, after questioning the person who sent me the email, asking if they had made an error, and being told to look harder, yes, several very clear dolphins made up the dark areas of the woman. Perhaps if I had associated with dolphins more I would have seen them right away .. but children don't often associate with dolphins, and children instantly recognize dolphins instead of the naked woman. The naked woman was also there
Chris Peterson wrote:What force would you propose to cause galaxies to "continue on through"? It is the absence of any such forces, or the absence of any that approach the attractive forces present in the filaments and walls, that keeps the galaxies where they are.
aristarchusinexile wrote:I propose that it is the energy within the void, energy unknown to us, which prevents the galaxies penetration.
I do not propose galaxies falling towards the voids, as I propose anti-gravity filling the voids .. rather, the voids are compressing the galaxies together into filaments .. galaxies between voids being squeezed.Chris Peterson wrote:You missed the point of my question. What force would cause the galaxies to fall in towards the voids in the first place? That is, what force is it that this proposed force of yours is opposing? You don't doubt Newton's First Law, do you?
Okay .. in nature the larger seems to mimic the smaller: as in our solar system somewhat mimics atomic structure (or is this comparison so outdated as to be thought dead?) Spiral galaxies somewhat resemble solar systems (objects circling a centre). Can there be any possible comparison between Loop Quantum Gravity and Coronal loops in uniform gravity? I am willing to be thought completely absurd on this one as my total reading on Loop Quantum Gravity adds up to only several minutes.
Zarathustra wrote:My backround is philosophy, not physics. I started this topic out of a dissatisfaction with the alternatives of a "big rip" or a "big chill". This is a philosophic dissatisfaction... The reason I like the big crunch is that it opens the idea that there is a cycle.
but ok, back to topic,Nietzsche wrote:What if a demon were to creep after you one day or night, in your loneliest loneness, and say: "This life which you live and have lived, must be lived again by you, and innumerable times more. And mere will be nothing new in it, but every pain and every joy and every thought and every sigh— everything unspeakably small and great in your life—must come again to you, and in the same sequence and series__" Would you not throw your self down and curse the demon who spoke to you thus? Or have you once experienced a tremendous moment, in which you would answer him: "Thou art a god, and never have I heard anything more divine!" [The Gay Science (1882), p. 341 (passage translated in Danto 1965, p. 210).]
I don't know, Occam razor maybe?But, besides an inference from regresion, why a sigularity?
This comparison is so outdated as to be thought dead.aristarchusinexile wrote:Okay .. in nature the larger seems to mimic the smaller: as in our solar system somewhat mimics atomic structure (or is this comparison so outdated as to be thought dead?)
Although the solar system would be an utterly amazing thing to experience, if planetary orbits mimicked atomic orbitals instead. 
Basically, atomic orbitals aren't orbits, they're clouds of probability where you can say an electron is likely to be found at any given time.When it comes down to it, these two really are the same thing. It's just masses orbiting a common center due to gravity, the only differences being in the details.Spiral galaxies somewhat resemble solar systems (objects circling a centre).
I've tried to read about LQG, and my brain has the scars to prove it.Can there be any possible comparison between Loop Quantum Gravity and Coronal loops in uniform gravity? I am willing to be thought completely absurd on this one as my total reading on Loop Quantum Gravity adds up to only several minutes.
The only relation between these two that I can fathom is a vague one involving the meaning of the word 'loop'. A coronal loop is plasma following a path of constant force, and the loops in LQG have something to do with 'paths' around nodes in spin networks... I think.I just like sharing what I read.Abstract: We model the interaction between the wind from a newly formed rapidly rotating magnetar and the surrounding progenitor. In the first few seconds after core collapse the magnetar inflates a bubble of plasma and magnetic fields behind the supernova shock, which expands asymmetrically because of the pinching effect of the toroidal magnetic field, as in PWNe, even if the host star is spherically symmetric. The degree of asymmetry depends on the ratio of the magnetic energy to the total energy in the bubble. We assume that the wind by newly formed magnetars inflating these bubbles is more magnetized than for PWNe. We show that for a magnetic to total power supplied by the central magnetar $\sim 0.1$ the bubble expands relatively spherically while for values greater than 0.3, most of the pressure in the bubble is exerted close to the rotation axis, driving a collimated outflow out through the host star. This can account for the collimation inferred from observations of long-duration gamma-ray bursts (GRBs). Given that the wind magnetization increases in time, we thus suggest that the magnetar-driven bubble initially expands relatively spherically (enhancing the energy of the associated supernova) while at late times it becomes progressivelymore collimated (producing the GRB). Similar processes may operate in more modestly rotating neutron stars to produce asymmetric supernovae and lower energy transients such as X-ray flashes.