Ra

Examples of Ra in the following topics:

• Further Reading

  • . & Fesen, R.A. 2006, "Faint X-Ray Structure in the Crab Pulsar Wind Nebula,'' ApJ, 652, 1277

• The H_2^+ Molecular Ion

  • $\displaystyle \left [ -\frac{\hbar^2}{2 \mu_{AB}} \nabla^2_{\bf R} -\frac{\hbar^2}{2 \mu_e} \nabla^2_{\bf r} - \frac{e^2}{r_A} - \frac{e^2}{r_B} + \frac{e^2}{R} - E \right ] \psi({\bf r},{\bf R}) = 0 $
  • $r_A$ and $r_B$ are the distances between the electron and the two protons and $R$ is the distance between the two protons.
  • $\displaystyle \left [ -\frac{\hbar^2}{2 \mu_e} \nabla^2_{\bf r} - \frac{e^2}{r_A} - \frac{e^2}{r_B} + \frac{e^2}{R} - E_j({\bf R}) \right ] \chi_j({\bf r};{\bf R}) = 0 $
  • $\displaystyle \chi_g = \frac{1}{\sqrt{2}} \left ( \psi_{1s} (r_A) + \psi_{1s}(r_B) \right )$
  • $\displaystyle \chi_u = \frac{1}{\sqrt{2}} \left ( \psi_{1s} (r_A) - \psi_{1s}(r_B) \right )$

• Rheumatism and Arthritis

  • Rheumatoid arthritis (RA) is a chronic, systemic inflammatory disorder that may affect many tissues and organs, but principally attacks flexible (synovial) joints .
  • Although the cause of rheumatoid arthritis is unknown, autoimmunity plays a pivotal role in both its chronicity and progression, and RA is considered a systemic autoimmune disease.
  • The discovery of the vitamin D receptor (VDR) in the cells of the immune system and the fact that activated dendritic cells produce the vitamin D hormone suggested that vitamin D could have immunoregulatory properties. 25(OH)D3 plasma levels have been found inversely correlated, with the RA disease activity showing a circannual rhythm (more severe in winter).
  • Recently, greater intake of vitamin D was associated with a lower risk of RA.
  • A significant clinical improvement was strongly correlated with the immunomodulating potential in vitamin D-treated RA patients.

• Types of Synovial Joints

  • Rheumatoid arthritis (RA) is an inflammatory disorder that primarily affects the synovial joints of the hands, feet, and cervical spine.
  • Although it is known that RA is an autoimmune disease in which the body's immune system mistakenly attacks healthy tissue, the cause of RA remains unknown.
  • RA is more common in women than men; the age of onset is usually 40–50 years of age.
  • Rheumatologists diagnose RA on the basis of symptoms (joint inflammation and pain), X-ray and MRI imaging, and blood tests.
  • There is currently no cure for RA; however, rheumatologists have a number of treatment options available.

• Ancient Egyptian Religion

  • The pharaoh was associated with Horus (and later Amun) and seen as the son of Ra.
  • Upon death, the pharaoh was fully deified, directly identified with Ra and associated with Osiris, the god of death and rebirth.
  • Most important of these was the daily journey of the sun god Ra.
  • The creation myth saw the world as emerging as a dry space in the primordial ocean of chaos, marked by the first rising of Ra.
  • These included the sun god Ra, the creator god Amun, and the mother goddess Isis.

• References

  • Finke, R.A., Ward, T.B., & Smith, S.M. (1992).
  • Ward, and R.A.

• Stelae of the Middle Kingdom

  • The obelisk was the symbol and perceived place of existence of the sun god Ra.
  • This obelisk is one half of a pair that originally marked the entrance to the temple of the sun god Ra.

• B.13 Chapter 13

  • $\displaystyle \frac{dE}{dt} = \int_{r_0}^{r_A} \frac{GM}{2 r^2} \frac{dm}{dt} dr = \frac{GM}{2} \frac{dm}{dt} \left ( r_0^{-1} - r_A^{-1} \right )$, the peak temperature is at $r_0$ and the minimum temperature is at $r_A$.

• Timeline

  • 570 - 632: Life of Muhammad ibn ‘Abdullāh RA, the founder of Islam and considered by Muslims to be a messenger of God.
  • 650: The verses of the Qur'an are compliled in the form of a book in the era of Uthman RA, the third Caliph of Islam.

• Applied Chords

  • The Neapolitan chord contains lowered scale-degree 2, along with scale-degree 4, and lowered scale-degree 6: ra, fa, and le.