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  1. J

    Standard enthalpies of formation of carbon nanotubes etc.

    Thanks for the reply TeethWhitener. That is useful information.
  2. J

    Standard enthalpies of formation of carbon nanotubes etc.

    I am curious about the standard enthalpies of formation of carbon nanotubes, diamond, carbon buckyballs, graphene, etc. I read from physics forums that the standard enthalpies of formation of these allotropes of carbon are small. However, since diamond is fabricated naturally under extreme...
  3. J

    What is the molar heat of self-decomposition of nitric acid?

    I am curious as to what is the value of the molar heat of self-decomposition of nitric acid. I've searched online and cannot seem to find the above value. Essentially, I am looking for the value for anhydrous nitric acid although I am aware that the acid is generally not provided in pure...
  4. J

    What is the heat of combustion of 1 kg carbon dioxide w/ magnesium?

    Thanks for your reply Lord Jestocost. Now I understand the reaction.
  5. J

    What is the heat of combustion of 1 kg carbon dioxide w/ magnesium?

    I am trying to find out the heat of combustion of one kilogram of carbon dioxide with magnesium. I am looking for results for stochiometric conditions of these two reactants. I have found the following equation online 2 Mg(s) + CO2 ---> 2 MgO(s) + C(s) yields a standard enthalpy of --810.1...
  6. J

    I Maximum Amplitude Of Gravitational Waves

    I am not sure. My memory seems to indicate that I read of the value of two in a Wikipedia article but upon searching related Wikipedia topics, I cannot find any verifying statements. Wikipedia is far from the most credible sources, so perhaps a more credible source is preferred. By a factor of...
  7. J

    I Maximum Amplitude Of Gravitational Waves

    I am curious as to what the maximum amplitude of gravitational waves is. I have read that the maximum amplitude as such is equal to two but I cannot seem to find again a reference that states this clearly.
  8. J

    Enthalpy of Formation of Tetraoxygen

    Bystander, that's fine. I guess the answer to my question has been resolved. I appreciate you looking into this for me. My guess is that the tetra-oxygen is so short lived and so rare that not enough of it can be produced to do the measurements.
  9. J

    Enthalpy of Formation of Tetraoxygen

    Either one or both would be cool. I would down load some of the reference papers in the Wikipedia reference but currently am on a tight budget.
  10. J

    Enthalpy of Formation of Tetraoxygen

    I am curious as to what is the Standard Enthalpy Of Formation is of Tetraoxygen in kJ/mol. I am assuming reference to the molar weight of the Tetraoxygen molecule. I seem to only find papers on the subject which are abstruse with detail but no clear answer to my inquiry. I have little formal...
  11. J

    I What is the gradient of a divergence and is it always zero?

    Thanks for the info fresh_42. I found those two links very helpful and I solved my problem of the reason for my inquiry.
  12. J

    I What is the gradient of a divergence and is it always zero?

    Hi Folks, Was just curious as to what is the gradient of a divergence is and is it always equal to the zero vector. I am doing some free lance research and find that I need to refresh my knowledge of vector calculus a bit. I am having some difficulty with finding web-based sources for the...
  13. J

    Standard Enthalpy of formation of Graphene

    Thanks for the enthusiastic replies to my question. I have better grasp of the chemistry now that folks have had a chance to respond.
  14. J

    Standard Enthalpy of formation of Graphene

    I am curious as to what the Standard Enthalpy of formation of Graphene is. I've noticed several highly technical papers on this subject but I got lost in the abstruse math and terminology. I am interested in the Standard Enthapies o both single layer and multi-layer graphene. I will be happy to...
  15. J

    A Gravitational Radiation Of Object In Forced Circular Motion.

    Thanks for the info pervect. I am going to check out those two sites today.
  16. J

    A Gravitational Radiation Of Object In Forced Circular Motion.

    I am curious as to the formula for radiative power due to a single object in forced circular motion. In particular, I am interested in the power of gravitational radiation for volumetric invariant mass densities for both the low density Newtonian limit and the high density general relativistic...
  17. J

    Oberth Maneuvers

    Hey Staff Mentors; Just thought to mention that I am co-authoring a popularizing book on interstellar travel possibilities. I cannot not thank you folks enough for correcting my assumptions and providing guidance. I was not too familiar with the Oberth Maneuver but I am pleased to mention that...
  18. J

    Oberth Maneuvers

    Thanks for correcting me, Staff Mentor. I got the same numbers you have. Definitely, the notion of using Jupiter does not make much sense in consideration of the 10 percent velocity gain. 5 km/s second extra velocity is not worth the effort. The 2 percent gain using Saturn is even more...
  19. J

    Oberth Maneuvers

    Thanks awesomely much, Staff Mentor. I'll run the numbers just so I can see for myself if the method of propulsion makes any sense or not. Again, thanks for the firm critique of my comments.
  20. J

    Oberth Maneuvers

    Sound good. Thanks for the info.
  21. J

    Oberth Maneuvers

    I cry uncle on this one Staff Mentor. I was more or less playing Devil's advocate to see if I could learn anything from your responses. Sounds like unless one wants to tolerate extreme g's, the Oberth Maneuvers using Saturn do not make sense unless one wants to squeeze every once of velocity out...
  22. J

    Oberth Maneuvers

    Well, you can use the Sun, and the gas giant planets as I mentioned before. You always have the angle of attack from the Sun to work with to approach the planets.Whether its 30 years or 300 years, meaningful chemical rocket propulsion to the stars is a valid concept using the Oberth maneuvers...
  23. J

    Oberth Maneuvers

    I'd read the paper on metastable helium which is peer reviewed and also do a comprehensive search on metastable helium fuel. I am sure the JPL folks are considering inert mass with the fuel portion which in reality can simply be a membranous or other porous structure. I stand by Orion's arm as...
  24. J

    Oberth Maneuvers

    The metastable Helium fuel with Isp > 3,000 seconds comes right from the JPL organization. See reference in a peer reviewed paper at http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/7684/1/03-1848.pdf [Broken]
  25. J

    Oberth Maneuvers

    Orion's Arm does consider some serious science. Simply do a google search on metastable helium chemical rocket fuels and other similar fuels and you will generally see the same results for Isp. I'll do the search if you want. Yes, diamond breaks down at is maximum compression resistance, but...
  26. J

    Oberth Maneuvers

    Regarding compression, the same or similar magnitudes for compression strengths are available from carbonaceous super-materials as tensile strength. Diamond can handle in excess of 10 mega-newtons per square centimeter. These supermaterials could be ideal for confining bulk quantities of fuel...
  27. J

    Oberth Maneuvers

    There are theoretical chemical fuels that may obtain a specific impulse in the 3,000 sec range or higher. So far, they have proved unstable but perhaps nanotech fabrication and confinement mechanisms might work to enable safe storage or large quantities. Also, with plausible materials of...
  28. J

    Oberth Maneuvers

    I am going to run the computations for the use of Jupiter and Saturn along with the Sun for Oberth Maneuvers. The escape velocities of these two gas giant planets is very close to that from the Sun at the Earth and Venus radial coordinates. I was wondering if anyone could provide the...
  29. J

    Fourth Generation Nuclear Weapons

    Hi sanman; Thanks for the URL to the article. I plan on reading that article in full later this evening. It occurred to me that indeed, attosecond laser pulses might be good to study superatoms. Other methods might include x ray diffraction crystallography, neutron diffraction...
  30. J

    Fourth Generation Nuclear Weapons

    Hi sanman; Thanks for posting the Wikipedia link to the superatoms article. I found the article most interesting. By the way, the Science News issue I was referring to is either the latest issue or the previous one. The article is of good quality and is about 3-4 pages long. I support...
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