seriously disabled

A thought came to my mind. If only we could find or bring from earth the resources necessarily to build a particle accelerator in space, we would not need to worry about safety or space concerns which the future accelerators (i mean those far beyond the LHC) will bring up.

So is it theoretically possible to build a giant particle accelerator (even larger than the LHC) in space?

Are all polymers considered solids? What about biopolymers and liquid crystal polymers? Are those solids too?

Yes and thanks for the clarification ajb.

In the commutative diagrams page in wolfram, what does the [math]\phi_{i_{0}}[/math] above the arrows mean?

Lukas Cimiotti has already upgraded his cluster from 52 cores to 72 cores. He is waiting another 4 months to upgrade to 76 cores which is the next small change (for him).

The cluster now has 9 Nehalem EP (2x4 cores) systems. When there is a dual socket six core system by Intel, we will see a cluster with 76-, 80-, ..., 108 (9x2x6) cores!

AMD systems don´t count!

Lukas's cluster is already alot stronger than Deep Blue and even much stronger than Garry Kasparov who beat Deep Blue.

In this video, starting from 0:58, how is it possible that the line trenches the hob (the cutting tool) leaves on the spinning gear are completely symmetrical despite the fact that the machine is stopped before the gear manages to complete the last (360 degree) rotation?

right, basically a lathe works by spinning the object in question and a blade is moved in from the side to shave bits off of it until it is the desired shape.

But how does a 4mm combustion chamber look like?

It's hard to me to follow what you are explaining insane_alien because I don't know how a lathe works.

A lathe is called מחרטה (machreta) in Hebrew but since I've never worked in industry and never actually worked with lathes or CNC machines and since I don't have a degree in mechanical engineering, it's pretty hard for me to figure this stuff out all in my head.

the parts arent micrmeter scale, they just have that sort of precision.

But how are lathes designed to have micrometer-scale precision?

But how do you manufacture micrometer-scale parts for these computerized lathes?

same way bigger ones do but smaller.

But if the parts are so small, how can you see what you are milling without a microscope or something like this?

well, from what i've read they are millimeter scale so i assume a miniturised form of milling.

But how does miniaturized milling actually work?

no, they're far to big for that.

So how?

How are microthrusters fabricated? Are they made by the same fabrication techniques used to make computer chips?

Particle physics has been useful in medical physics: X-rays, proton therapy, positron emission tomography and I am sure many others.

 

As for the modern theories who knows. What I am sure of is that spin-off technologies from experimental particle physics will continue. These will have an impact on medicine, computing and other things.

 

Maybe this report from the IOP may help.

But what will be the future applications of quantum gravity theories like string theory? Do quantum gravity theories have any applications at all?

According to this Internet source here some physics majors go on to become professional physicists but the majority pursue careers in fields where they can put their knowledge to more practical applications (like electronics, computer science, finance, medicine etc).

So my question is: What could be some of the real life applications of particle physics, supersymmetry, supergravity and the other theories of modern particle physics in medicine, electronics, computers, new power sources etc?

Without knowing it: Phys Rev B is solid state physics (very ordered systems) and material sciences (any materials?). I'd guess that this section then is for what goes into the so-called "soft matter" direction, say polymer physics, glasses, maybe even fluids.

So an ordered system is any system which is arranged in a crystal lattice and a non-ordered system is any system which is not a crystal lattice?

In the journal physical review B, there is a section devoted to "Inhomogenous, disordered and partially ordered systems".

Could someone please explain to me what each of them means?

Maybe the answer is that Tallahassee is in a humid subtropical climate while Haifa is in a mediterranean climate. These climates are obviously very different.

Britannica delves more into thehumid subtropical climate but I don't have access to the full article.

The problem with this theory is that Tallahassee is very much close to the Atlantic ocean too and especially to the warm water of the Gulf of Mexico.

Why is Tallahassee, Florida much colder than Haifa, Israel although Haifa is in an higher latitude (closer to the north pole) than Tallahassee?

Tallhassee is in latitude 30° 30' and Haifa is in latitude 32° 50' but still Tallhassee is much cooler than Haifa in winter. In December and January, the average high temperature in Tallhassee is 64 °F (18 °C) and the average low is 42 °F (6 °C). On occasion, temperatures fall into the 20s and 10s at night, and temperatures in the single digits have been recorded. Tallahassee recorded the state's lowest temperature of -2 °F (-20 °C), on February 13, 1899. Over the last 100 years, the city has also recorded several snowfalls; the heaviest was 2.8 inches on February 13, 1958. Historically, the city usually records at least observed flurries every three to four years, but on average, measurable amounts of snow (1" or more) occur only every 16 years.

In Haifa in winter it is rare for temperature to reach 0°C and snow is also very rare.

deBroglie wavelength is h/p. For a given speed, small mass means small momentum

But how is this related to volume?

In the chemical bond article, Wikipedia states that due to the matter wave nature of electrons and their smaller mass, they occupy a very much larger amount of volume compared with the nuclei.

But why is that? Why do electrons occupy a very much larger volume than the nuclei because of their smaller mass? What does their mass have to do with the volume they occupy?

electrostatic attraction to the electron sea. same as in all metals

But if the electrons are constantly flowing around the nuclei, then how can there be electrostatic attraction all the time?

Merged post follows:

Also in solid metallic hydrogen, are the individual hydrogen atoms actually bound together to other hydrogen atoms or are they unbound?

Solid metallic hydrogen consists of a crystal lattice of atomic nuclei (namely, protons) separated only by a dense electron soup which flows between them.

My question is: How are the atomic nuclei bound together? What keeps the nuclei in a crystal lattice structure?