E. LOMMEL. — Interferenz durch circulare Doppelbrechung (Interférences de rayons circulaires); Wied. Ann., t. XXXVI, p. 733; 1889

Modélisation vectorielle de l'éclairement global en lancer de rayons

Les automates circulaires biaisés vérifient la conjecture de Cerný

An action X x A^ —> X : (x.w) *—• x * w ofthefree semigroup A^~ over the alphabet A is synchronised by a word w G A + if x * w = y * w for ail x}y £ X. Cerny conjecturée that if there is such a w and \X\ = n, then there is one oflength < (n l ) 2 . The conjecture remains open, except for particular classes of actions. An action is circular if there is c G A acting as a circular permutation, and...

Etude Au Microscope Electronique Des Transformations Nucleaires De E. Coli K12 S Et K12 S (λ26) Apres Irradiation Aux Rayons Ultraviolets Et Aux Rayons X

Nuclear transformations induced in E. coli K12S and K12S(lambda(26)) by ultraviolet radiations and x-rays have been studied with ultrathin sections in the electron microscope. The nucleoplasm keeps its normal aspect during "fragmentation" and during "condensation" of the nucleus into the "vesicular" form. Serial sections show that the "fragmented" nucleus consists in reality of only one very to...

R-e-s-p-e-c-t.

Alex Muncy was still an apprentice at STIHL Inc. when the company enlisted him in revamping an automated packaging process. The package would contain the outdoor power equipment manufacturer’s signature trimmer line, the colorful cord used to give lawns a precise, neat appearance. The goal: satisfy the customer while cutting production costs. Muncy’s team developed a concept, designed the packa...

Algorithmes pour le trace de rayons dans le cadre d'une modélisation par arbre de construction