The role of the liquid interface agent in mechanical properties improvement of modified chalk filled polyolefins

On the basis of the experimental results described in detail in the following sections an explanation of the mechanism of liquid modifier in chalk filled PP action was proposed. After concluding that liquid modifier does not change the sample morphology and crystallinity it was stated that it facilitates filler particles translocation in polymer matrix during deformation. Such translocations are the necessary condition for saturation of volume increase of the sample due to void formation in the process of polymer filler separation preserving the sample from its premature fracture. The most important physicochemical parameter of liquid modifier seems to be its molecular weight. This parameter determines liquids ability to migrate in micropore structure arising under stress and thus to act as a cracking agent. The possibility of the importance of more efficient heat dissipation in the sample was shown indicating the role of better thermal contacts in the sample in the case of modified chalk used as a filler. Such picture of mechanism of liquid modifier action leads also to two important conclusions:

Due to polymer filler separation by means of liquid layer no further filler particles surface processing, as in some cases, is needed.

The method of modification can be easily generalized for other polymers especially other polyolefins [19], [20] as physicochemical requirements for liquid are known.

     

Über die Bildung von Dihydro-1,2-oxazin-N-oxiden durch intramolekulare Addition eines Nitronat-Anions an eine Carbonylgruppe

The Formation of Dihydro-1,2-oxazine N-Oxides through an Intramolecular Addition of a Nitronate Anion to a Carbonyl Group Highly substituted 4-keto-1-nitroalkanes cyclize under basic conditions to dihydro-1,2-oxazine N-oxides. These N-oxides are thermally unstable and decompose to 1,4-diketones, BF₃ catalyzes a similar decomposition, but probably via a different mechanism.     

Chromatographic method for the isolation of active 40S and 60S subunits from rat liver polyribosomes

A rapid and simple procedure for isolation of 40S and 60S ribosomal subunits by ion-exchange column chromatography is described. The dissociated ribosomes can be separated and non-ribosomal proteins and low-molecular-weight substances removed. An assessment by physicochemical and functional criteria showed that the ribosomal subunits obtained are active and sufficiently homogeneous.     

Pion and strangeness puzzles

The dependence of pion and strangeness production on the number of participant nucleons and collision energy is discussed for central A+A collisions. A possible interpretation of the experimental results assuming transition to QGP is sketched within a simple statistical approach.     

Generalized fractional programming: Algorithms and numerical experimentation

Several algorithms to solve the generalized fractional program are summarized and compared numerically in the linear case. These algorithms are iterative procedures requiring the solution of a linear programming problem at each iteration in the linear case. The most efficient algorithm is obtained by marrying the Newton approach within the Dinkelbach approach for fractional programming.     

A remark on two-dimensional stokes flow solutions

Summary It is shown that the solution of Laplace's equation is useful to obtain a unique Stokes stream function which is valid everywhere under limited circumstances. When the Stokes stream function fails at infinity the use of the Oseen solution is required to obtain a physically acceptable solution.

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Résumé Les solutions de l'équation de Laplace permettent d'obtenir des fonctions de courant au sens de Stokes uniques et valides en tous points de l'espace, dans certains cas seulement. Quand les fonctions de courant au sens de Stokes ne sont pas valides à l'infini l'utilisation de functions de courant au sens d'Oseen est nécessaire pour obtenir une solution physiquement valable.