On the Equation H=mv^2 and the Fine Structure of the Hydrogen Atom

The recently introduced reconciliation of the theories of special relativity and wave mechanics implies that the mass-energy equivalence principle must be expressed mathematically as H = mv^2, where H is the total energy of a particle, m is its relativistic mass, and v is its velocity; not H = mc^2 as was widely believed. In this paper, the equation H = mv^2 will be used to calculate the energy levels in the spectrum of the hydrogen atom. It is demonstrated that the well-known Sommerfeld-Dirac formula is still obtained, but without the constant term m_0 c^2 that was originally present in the formula.Comment: V2: added a few comments in response to the questions that I receive

New Reflections on Electron's Energy and Wavefunction in the Hydrogen Atom

Schrodinger's equation predicts something very peculiar about the electron in the Hydrogen atom: its total energy must be equal to zero. Unfortunately, an analysis of a zero-energy wavefunction for the electron in the Hydrogen atom has not been attempted in the published literature. This paper provides such an analysis for the first time and uncovers a few interesting facts, including the fact that a "zero-energy wavefunction" is actually a quantized version of the classical wavefunction that has been known for decades

Challenges of building digital repositories in Africa: A case study of best practise

Creating the sustainable means to safeguard and make the African scientific memory evolutive for future generations make challenges regarding preservation and knowledge sharing most acute. Then, many initiatives have been developed to generate synergies at a national and regional level in order to raise awareness in the urgent need to implement policies and programs to safeguard and valorize the rich African historical, scholarly and cultural heritage. But, despite resolutions and recommendations outlining road maps to root out the continent from isolation regarding the internationally networked system of knowledge production and sharing, there are now few relevant African contents freely accessible. And this, in spite of the existing potential and huge progress made in ICT outputs. In the general African context, with limited economic resources, one can therefore understand why such challenges are of urgent pressure. 1 - Challenges attached to the preservation and valorization of African scholarly contents. 2 - Presenting a case study of best practice: the digital repository of IFAN Ch A Diop

El solapamiento de la dieta del carite estriado Indo–Pacífico Scomberomorus commerson (Lac., 1802) y del pez sable Trichiurus lepturus (L., 1758) en la costa mediterránea egipcia

The immigrant S. commerson (Lac., 1802) represents more than 2% of the total Egyptian catch and its distribution stretches from East to West along the Egyptian Mediterranean coast. The feeding habits of T. lepturus and S. commerson were investigated through stomach content analysis of specimens collected from Abu Qir Bay (Egypt) on a seasonal basis from November 1999 to January 2001 using daytime purse seines. The food content range of T. lepturus was wide, including Engraulis encrasicolus, Gobius spp., Sardinella aurita, Sardina pilchardus, fish eggs, amphipods, copepods and shrimps. The main diet constituents of S. commerson included Engraulis encrasicolus, Sardinella aurita, Sardina pilchardus and shrimps. Seasonal variations of feeding activity indicated that food consumption was highest in spring to autumn for T. lepturus and in summer and autumn for S. commerson. The diet overlap in terms of number and weight between the two species was high. Food composition was related to fish size in both examined fishes. Small T. lepturus (less than 30 cm) fed mainly on crustaceans, while larger samples (more than 59 cm) fed only on fishes. Teleosts were the most important food item for S. commerson of all sizes, while this species became piscivorous when larger than 40 cm in length. Key words: Diet and trophic level, Trichiurus lepturus, Scomberomorus commerson, Egyptian coast.La especie inmigrante S. commerson (Lac., 1802) constituye más del 2% de las capturas egipcias totales y su área de distribuciónse extiende de este a oeste a lo largo de la costa mediterránea egipcia. Se investigaron los hábitos alimentarios de T. lepturus y S. commerson a través del análisis de los contenidos estomacales de los ejemplares recogidos en la bahía de Abu Qir (Egipto) siguiendo una pauta estacional desde noviembre de 1999 a enero del 2001, utilizando jábegas diurnas. La variedad del contenido estomacal de T. lepturus era amplia, incluyendo a Engraulis encrasicolus, Gobius spp., Sardinella aurita, Sardina pilchardus, huevas de pez, anfípodos, copépodos y decápodos. La dieta principal de S. commerson incluía Engraulis encrasicolus, Sardinella aurita, Sardina pilchardus y decápodos. Las variaciones estacionales de la actividad alimentaria indicaban que el mayor grado de consumo de alimentos se daba de primavera a otoño en T. lepturus, y de verano a otoño en S. commerson. El solapamiento de la dieta de las dos especies, en términos de número y peso, era grande. En ambas especies examinadas se detectaron cambios en la composición del alimento, en función de la talla de los peces. Los T. lepturus de tallas pequeñas (menos de 30 cm) se alimentaban principalmente de crustáceos, mientras que los de tallas grandes (de más de 59 cm) se alimentaban sólo de peces. En todos los grupos de tallas de S. commerson, las presas principales eran los teleósteos, aunque esta especie se vuelve totalmente piscívora al superar el tamaño de 40 cm. Palabras clave: Dieta y nivel trófico, Trichiurus lepturus, Scomberomorus commerson, Costa egipcia