Antinematic local order in dendrimer liquids

We use monomer-resolved numerical simulations to study the positional and orientational structure of a dense dendrimer solution, focusing on the effects of dendrimers' prolate shape and deformability on the short-range order. Our results provide unambiguous evidence that the nearest-neighbor shell of a tagged particle consists of a mixture of crossed, side-by-side, side-to-end, and end-to-end pair configurations, imposing antinematic rather than nematic order observed in undeformable rodlike particles. This packing pattern persists even at densities where particle overlap becomes sizable. We demonstrate that the antinematic arrangement is compatible with the A15 crystal lattice reported in several dendrimer compounds.Comment: 6 pages, 3 figure

Observation of condensed phases of quasi-planar core-softened colloids

We experimentally study the condensed phases of repelling core-softened spheres in two dimensions. The dipolar pair repulsion between superparamagnetic spheres trapped in a thin cell is induced by a transverse magnetic field and softened by suitably adjusting the cell thickness. We scan a broad density range and we materialize a large part of the theoretically predicted phases in systems of core-softened particles, including expanded and close-packed hexagonal, square, chain-like, stripe/labyrinthine, and honeycomb phase. Further insight into their structure is provided by Monte Carlo simulations

Aggregates of two-dimensional vesicles: Rouleaux and sheets

Using both numerical and variational minimization of the bending and adhesion energy of two-dimensional lipid vesicles, we study their aggregation, and we find that the stable aggregates include an infinite number of vesicles and that they arrange either in a columnar or in a sheet-like structure. We calculate the stability diagram and we discuss the modes of transformation between the two types of aggregates, showing that they include disintegration as well as intercalation.Comment: 4 figure

Design of composite bridge considering stages and sequence of construction

The degree represents design of bridge considering stages and sequence of construction using commercial programme Scia ESA PT. The example is represented with actual road bridge over highway, for which the design project has already been done also considering stages and sequence of construction. Road bridge is designed as hybrid construction with three spans, made of prestressed concrete and composite steel – concrete construction in the middle span. In degree all internal forces in construction stages and service stages are calculated and compared with results from existent design project. Dimensioning of main structural elements has also been done with attention on checking composite parts. Global analysis has been made considering creep, shrinkage and relaxation efects during construction and till the end of construction life period. Becouse composite cross – sections are in fourth class, elastic verification on effective cross – sections has been done. For modeling of bridge and sequence of construction additional three modules, build in programme, were used: construction stages, time dependent analysis, prestressing. Examples with short instructions, represented in annex, were used for checking all three modules. Problem in programme appeared by checking stresses in composite elements, where also in examples from annex and in degree, programme calculated very strange stresses in composite concrete slab. Regarding the problems I decided to calculate stresses analiticaly considering sum of internal forces of individual stages. Otherwise the comparison of internal forces from degree and design project indicated very similar results