Recent content by hilbert2

If it's random asymmetry in question, instead of genetically programmed typical handedness, it can be controlled by oscillatory chemical reactions. This seems to be how random stripes on a zebra are formed...

Here's an article about biomolecule formation triggered by high energy radiation https://royalsocietypublishing.org/rsta/article/375/2109/20160348/58818/Subsumed-complexity-abiogenesis-as-a-by-product-of I suppose several experiments have been conducted to mimic the environment that existed on...

There's lots of ionizing radiation in space and that's why unusual chemical compounds can form there.

Nowadays there seem to exist capacitors of hundreds of Farads for sudden energy release, which is a bit surprising if one hasn't seen that before. https://en.wikipedia.org/wiki/Supercapacitor Sorry for having just a Wikipedia source, but it should be easy to find actual references.

Just to point out that in individual cases, a vector ##\left|\psi\right.\rangle## can be a simultaneous eigenstate of non-commuting observables. If it's angular momentum in question, this can happen when eigenvalues are zero.

Even in 3D there can be state vectors, such as the hydrogenic atom s orbitals, where all of the angular momentum components have value 0. The uncertainty relation just says that you can't form a complete basis of ##\mathcal{H}## from only vectors that have simultaneously definite ##L_x##...

One type of compounds I find interesting are these cubane-like carbon allotropes, which could be used for storing energy to little volume or mass, much like the polynitrogens and metallic hydrogen which are planned as high energy density materials...

It's in this PubChem entry: https://pubchem.ncbi.nlm.nih.gov/compound/11170913 The patents linked there are written in Chinese or Korean so difficult to read, at least for me. The articles mentioning that compound really seem to just refer to the one I mentioned in the earlier post. But it...

It's mentioned, for example, in this one: https://connectsci.au/ch/article-abstract/55/8/495/139458/An-Unexpected-Zinc-Coordination-Polymer-formed?redirectedFrom=fulltext In that paper, they describe trying to produce a tetrazole compound, which has a heterocyclic ring with only one carbon atom...

Thanks. Just had to find a correct IUPAC name for that chemical to find it, I guess. The PubChem page lists three chemical vendors, and it's said to be a solid with melting point between 70 and 80 degrees Celsius. Even without any oxidizers mixed with it, that substance is likely to decompose...

Several articles describe n,n'-dicyanohydrazine being used as a reagent in chemical synthesis. Is there any reason why it would or wouldn't be possible to replace all the H atoms in hydrazine with -CN substituents? That n,n,n',n'-tetracyanohydrazine would look like a potential high energy fuel...

Some of them actually become mirroring and not just opaque, but there doesn't seem to be much data about the transmittance on a large wavelength range that includes radio and microwave frequencies.

Some companies seem to be selling "smart glass" products that can be electrically tuned at will to be either mirroring or transparent, at least in visible wavelengths. Suppose someone were to Faraday shield a room to prevent van Eck phreaking or whatever kind of eavesdropping from outside...

Actually now that makes sense to me, even if a whole spherical surface acts as a delta potential, the particle will escape. Maybe it's a different situation if there's an infinite number of shells at ##r=R##, ##r=2R##, ##r=3R## and so on. Or a 3D lattice with point interactions at each lattice...

Yes, but only if it has a negative multiplier in front of it.