Materials Literature
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A model system for classical fluids out of equilibrium, referred to as a dissipative particles dynamics (DPD) solid, is studied by analytical and simulation methods. The time evolution of a DPD particle is described by a fluctuating heat equation. This DPD solid with transport based on collisional transfer (high-densi…
Les pratiques de fertilisation et d'amendement peuvent contribuer à modifier profondément les propriétés des sols. Ceci est mis en évidence par le dispositif des 42 parcelles de l'INRA à Versailles qui reçoit chaque année les mêmes traitements depuis 1929. Il présente l'originalité d'être en jachère nue. Les résultats…
Die Bildung einer vinylogen Brücke zwischen benachbarten Pyrrolringen (A und B) bei der Reaktion von 5,10,15-Triphenylcorrol mit CI4 führt zum entsprechenden Hemiporphycen (siehe Struktur; N blau, I rosa, C weiß, H grün). Dieser Ansatz eröffnet einen einfachen Zugang zu funktionalisierten Hemiporphycenen.
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In this paper we present results related to the self-assembly of different generations of disulfide-cored 2,2-bis(hydroxymethyl)propionic acid-based dendritic structures onto gold surfaces. These molecular architectures, ranging from generation 1 to generation 3, contain removable acetonide protecting groups at their…
CuO supported on Al 2 O 3 -coated cordierite-honeycomb CuO catalysts exhibit high activities for SO 2 and NO removal from flue gas at 400 °C. In a catalyst preparation process, it was found that acid treatment of the cordierite was crucial. This work presents a detailed study on the promoting effect of acid treatment…
This article describes the use of tissue-engineered dermal replacement in the vestibular extension instead of palatal donor tissue or (split-thickness) skin graft. In three patients the living human-derived fibroblast skin substitute (Dermagraft) was implanted on the wound surface after mucogingival junction and supra…
The electronic structure and quantum conductance of superlattices made of metallic carbon nanotubes are investigated. It is shown that minibands with the same origin as nonconductive states in metallic quantum dots [L. Chico and W. Jask\'olski, Phys. Rev. B 69, 085406 (2004)] can have a nonzero conductance in superlat…
Analytical solutions to the diffusion equations for fast grain boundary diffusion in polycrystalline solids of finite thickness bounded by two parallel surface planes are presented. The grain boundary diffusion coefficient may be higher by several orders of magnitude than the bulk (volume) diffusion coefficient. The m…
We report on high-resolution transmission electron microscope structural studies of InAs colloidal semiconductor nanocrystal quantum dots (NCQDs) on ultrathin GaAs (001) semiconductor single-crystal substrates. We employ a benign method for preparing electron transparent specimens that is suitable for the study of suc…
The industrial and scientific communities have expressed the need for sensing and actuation over a broad temperature range. This review presents high temperature piezoelectric materials that are commercially available and those that are under development. Key materials, in order of increasing Curie temperature (T/sub…
UNLABELLED: The availability of advanced profile-profile comparison tools, such as PRC or HHsearch demands sophisticated visualization tools not presently available. We introduce an approach built upon the concept of HMM logos. The method illustrates the similarities of pairs of protein family profiles in an intuitive…
Intramolecular excitation energy hopping (EEH) time within a dodecameric porphyrin wheel C6ZA, in which six meso-meso linked zinc(II) diporphyrin (Z2) subunits are bridged by 1,3-phenylene spacers, is deduced by a Förster energy hopping model based on S(1)-S(1) exciton-exciton annihilation and anisotropy depolarizatio…
Reactions between solid zinc oxide and molten sodium or potassium pyrosulfates at 500 degrees C are shown by Raman spectroscopy to be 1:1 reactions leading to solutions. By lowering the temperature of the solution melts, colorless crystals form. Raman spectra of the crystals are given and tentatively assigned. Crystal…
Improved therapies for the treatment of life-threatening and chronic debilitating disease are urgently needed. Many seek to achieve more effective chemotherapy through the use of nanosized drug carriers-now being called ‘‘nanomedicines.’’ The technologies being explored include nanoparticles (1), polymer-coated liposo…
We use structure-optimization techniques to study the equilibrium packing of fullerenes in carbon nanotube peapods. Our results for nanotubes containing ${\mathrm{C}}_{n}$ fullerenes with $60\ensuremath{\leqslant}n\ensuremath{\leqslant}84$ atoms indicate that the fullerenes are more densely packed in the nanotubes tha…
Nanotube sidewall opening: The functionalization of single-walled carbon nanotubes (SWCNTs) by addition of CCl2 and NCOOC2H5 groups to the sidewalls has been investigated computationally using density functional theory. The SWCNT electronic structures near the Fermi level are only changed slightly by functionalization…
Electrical and mechanical properties of composite materials based on Carbon Nanotubes are considered for aerospace applications. Nanostructured materials gained great importance in the past decade, owing to their wide ranging potential applications in many areas, e.g. mechanical, structural, sensor, biomedical, electr…
Les eaux de l'Oued Hassar (Maroc) sont caractérisées par une forte minéralisation. La conductivité, variant entre 3470 et 7210 µS.cm -1 , est due essentiellement aux fortes teneurs en chlorures. L'examen de l'Indice de Pollution Organique (IPO) montre que l'effluent d'eaux usées provenant de la ville de Mediouna const…
The refractive index and density of fluorine- and chlorine-doped silica glasses were measured as functions of fictive temperature. The halogen concentrations were observed to have a refractive index or density that is independent of the fictive temperature were found. This implies that these properties are not affecte…