1,139 research outputs found
An Analytical Expression for the Hubble diagram of supernovae and gamma-ray bursts
A recent paper by Harmut Traunm\"uller shows that the most adequate equation
to interpret the observations on magnitude and redshift from 892 type 1a
supernovae would be mu = 5 log[(1+z) ln(1+z)] + const. We discuss this result
which is exacly the one we have obtained few years ago when postulating a
relation between the speed of light and the expansion of the universe. We also
compare our analytical result to the conclusion of Marosi who studied 280
supernovae and gamma-ray bursts in the range 0.1014 < z < 8.1. The difference
between his results and ours is at worst of 0.3 %.Comment: 7 pages, 1 figur
Alien Registration- Langlois, Jean-Baptiste (Lewiston, Androscoggin County)
https://digitalmaine.com/alien_docs/28839/thumbnail.jp
Product design-Process selection-Process planning Integration based on Modelling and Simulation
As a solution for traditional design process having many drawbacks in the manufacturing process, the integration of Product design-Process selection-Process planning is carried out in the early design phase. The technological, economic, and logistic parameters are taken into account simultaneously as well as manufacturing constraints being integrated into the product design. As a consequence, the most feasible alternative with regard to the product’s detailed design is extracted satisfying the product’s functional requirements. Subsequently, a couple of conceptual process plans are proposed relied on manufacturing processes being preliminarily selected in the conceptual design phase. Virtual manufacturing is employed under CAM software to simulate fabrication process of the potential process plans. Ultimately, the most suitable process plan for fabricating the part is recommended based upon a multi-criteria analysis as a resolution for decision making
Band structures of II-VI semiconductors using Gaussian basis functions with separable ab initio pseudopotentials: Application to prediction of band offsets
We describe the implementation of a separable pseudopotential into the dual space approach for ab initio density-functional calculations using Gaussian basis functions. We apply this Gaussian dual space method (GDS/DFT) to the study of II-VI semiconductors (II=Zn, Cd, Hg; VI=S, Se, Te, Po). The results compare well with experimental data and demonstrate the general transferability of the separable pseudopotential. We also introduce a band-consistent tight-binding (BC-TB) model for calculating the bulk contributions to the valence-band offsets (VBO’s). This BC-TB approach yields good agreement with all-electron ab initio GDS/DFT results. Comparisons between BC-TB results of VBO obtained with and without p-d coupling demonstrate quantitatively the importance of d electrons and cation-d–anion-p coupling in II-VI systems. Agreement between ab initio results and experimental results is excellent
La Bazoge – Les Barres
Situé sur le tracé de la future autoroute A28, le site des Barres a été évalué par G. Guillier en 1998. La fouille effectuée en 1998 a confirmé qu’il s’agissait d’une minière occupant au moins une surface de 1 600 m2 (surface estimée du site : 5 000 m2). L’exploitation du minerai de fer se présente principalement sous la forme de puits d’accès à des galeries étayées. Plus de 140 structures d’extractions ont été identifiées. Actuellement, la seule datation réalisée sur un charbon de bois prove..
La Bazoge – Les Petites-Rouilles
Les fouilles archéologiques de mines de fer en milieux sédimentaires sont extrêmement rares. Le tracé de l’autoroute A28 présente l’une des rares occasions d’en étudier en France. Sur les trois minières repérées actuellement sur le tracé : les Petites-Rouilles (La Bazoge), le Grand-Hameau (Saint-Saturnin), Rougemont (La Bazoge), les deux premières, distantes de 3 km, ont fait l’objet d’une fouille en 1997. L’exploitation du minerai de fer occupe le sommet et le tiers supérieur d’une des butte..
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