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Additional Properties (additional + property)
Selected AbstractsOn some properties of suboptimal colorings of graphsNETWORKS: AN INTERNATIONAL JOURNAL, Issue 2 2004Ivo Blöchliger Abstract Starting from the trivial observation that, in any optimal coloring of a graph, there always exists a node v such that its neighborhood N(v) contains all colors, we examine related properties in suboptimal colorings (i.e., those using more than ,(G) colors, where ,(G) is the chromatic number). In particular, we show that, in any (,(G) + p)-coloring of G, there is a node v such that its generalized neighborhood Nq(v) with q = max{2p , 1, 2} contains ,(G) colors for p , 1. Additional properties of (,(G) + p)-colorings are also given. © 2004 Wiley Periodicals, Inc. [source] Direct Visualization of Deformation in VolumesCOMPUTER GRAPHICS FORUM, Issue 3 2009Stef Busking Abstract Deformation is a topic of interest in many disciplines. In particular in medical research, deformations of surfaces and even entire volumetric structures are of interest. Clear visualization of such deformations can lead to important insight into growth processes and progression of disease. We present new techniques for direct focus+context visualization of deformation fields representing transformations between pairs of volumetric datasets. Typically, such fields are computed by performing a non-rigid registration between two data volumes. Our visualization is based on direct volume rendering and uses the GPU to compute and interactively visualize features of these deformation fields in real-time. We integrate visualization of the deformation field with visualization of the scalar volume affected by the deformations. Furthermore, we present a novel use of texturing in volume rendered visualizations to show additional properties of the vector field on surfaces in the volume. [source] Optical and physicochemical properties of silica-supported TiO2 photocatalystsAICHE JOURNAL, Issue 8 2006Javier Marugán Abstract Commercial applications of photocatalysis in slurry reactors employing titanium dioxide particles present the disadvantage of the additional cost associated with the downstream catalyst separation. In past years a significant effort has been made to develop supported titania photocatalysts on particles of larger size in order to facilitate the sedimentation recovery process. In this work, two different silica materials have been used for preparing immobilized catalysts. Their physicochemical characteristics have been compared with those corresponding to two commercially available unsupported titanium dioxide catalysts. However, for reaction kinetics and reactor design purposes, three additional properties must be known: (i) the spectral specific radiation absorption coefficient, (ii) the spectral specific radiation scattering coefficient, and (iii) the asymmetry factor of a model for the angular distribution of the scattered photons (the phase function). They have been determined with specially designed spectrophotometer transmission, diffuse transmittance, and diffuse reflectance experiments and constitute the most significant addition to this contribution. © 2006 American Institute of Chemical Engineers AIChE J, 2006 [source] A Hybrid Galerkin,Monte-Carlo Approach to Higher-Dimensional Population Balances in Polymerization KineticsMACROMOLECULAR REACTION ENGINEERING, Issue 9-10 2010Christof Schütte Abstract Population balance models describing not only the chain-length distribution of a polymer but also additional properties like branching or composition are still difficult to solve numerically. For simulation of such systems two essentially different approaches are discussed in the literature: deterministic solvers based on rate equations and stochastic Monte-Carlo (MC) strategies based on chemical master equations. The paper presents a novel hybrid approach to polymer reaction kinetics that combines the best of these two worlds. We discuss the theoretical conditions of the algorithm, describe its numerical realization, and show that, if applicable, it is more efficient than full-scale MC approaches and leads to more detailed information in additional property indices than deterministic solvers. [source] Existence of global solutions to a model of chondrogenesisMATHEMATICAL METHODS IN THE APPLIED SCIENCES, Issue 3 2009B. Kazmierczak Abstract The paper considers conditions sufficient for the existence of classical C solutions to a new model of chondrogenesis during the vertebrate limb formation. We assume that the diffusion coefficient of the fibronectin is positive and that the function describing the interaction between the fibronectin and cells satisfies some additional properties. Copyright © 2008 John Wiley & Sons, Ltd. [source] Electrophysiologic Effects of Carvedilol: Is Carvedilol an Antiarrhythmic Agent?PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 9 2005NABIL EL-SHERIF The cardiovascular drug carvedilol is characterized by multiple pharmacological actions, which translate into a wide-spectrum therapeutic potential. Its major molecular targets are membrane adrenoceptors, ion channels, and reactive oxygen species. Carvedilol's favorable hemodynamic effects are due to the fact that the drug competitively blocks ,1 -, ,2 -, and ,1 - adrenoceptors. Several additional properties have been documented and may be clinically important, including antioxidant, antiproliferative/antiatherogenic, anti-ischemic, and antihypertrophic effects. The antiarrhythmic action of carvedilol may be related to a combination of its ,-blocking effects with its modulating effects on a variety of ion channels and currents. Several studies suggest that the drug may be useful in reducing cardiac death in high-risk patients with prior myocardial infarction and/or heart failure, as well as for primary and secondary prevention of atrial fibrillation. This article will review experimental data available on the electrophysiologic properties of carvedilol, with a focus on their clinical relevance. [source] Generation of branched actin networks: assembly and regulation of the N-WASP and WAVE molecular machinesBIOESSAYS, Issue 2 2010Emmanuel Derivery Abstract The Arp2/3 complex is a molecular machine that generates branched actin networks responsible for membrane remodeling during cell migration, endocytosis, and other morphogenetic events. This machine requires activators, which themselves are multiprotein complexes. This review focuses on recent advances concerning the assembly of stable complexes containing the most-studied activators, N-WASP and WAVE proteins, and the level of regulation that is provided by these complexes. N-WASP is the paradigmatic auto-inhibited protein, which is activated by a conformational opening. Even though this regulation has been successfully reconstituted in vitro with isolated N-WASP, the native dimeric complex with a WIP family protein has unique additional properties. WAVE proteins are part of a pentameric complex, whose basal state and activated state when bound to the Rac GTPase were recently clarified. Moreover, this review attempts to put together diverse observations concerning the WAVE complex in the conceptual frame of an in vivo assembly pathway that has gained support from the recent identification of a precursor. [source] Purkinje based IOL centrationACTA OPHTHALMOLOGICA, Issue 2008MJ TASSIGNON Purpose Surgeon-controlled centration of IOLs might be an issue when introducing IOL optics yielding additional properties aiming at correcting spherical aberrations, astigmatism and accommodation or pseudoaccommodation. Methods First and third Purkinje reflexes can be used during cataract surgery for the purpose of IOL alignment provided the IOL allows that freedom of action. The bag-in-the-lens (BIL) concept has been designed to add this dimension of freedom to the surgeon. Results When using the Purkinje alignment method, a physiological nasally positioning of the IOL can be observed. Aberrometry shows an increased spherical aberration but no increase of other HO aberrations. Conclusion Surgeon-controlled centration of IOL is possible with the BIL implantation technique. This opens new perspectives for further development and alignment of the optic. Commercial interest [source] The cytoplasmic tail of invariant chain modulates antigen processing and presentationEUROPEAN JOURNAL OF IMMUNOLOGY, Issue 2 2003Abstract The MHC class II-associated invariant chain (Ii) has several important functions in antigen presentation. In this study, we have examined the effect of Iip33 expression on endocytic transport and antigen presentation. We find that degradation of both endocytosed antigen and Ii itself is delayed in cells expressing high levels of Ii, whereas a mutant Ii with an altered charge distributionin the cytoplasmic tail was unable to exert this effect. Furthermore, the Ii mutant did not enhance the presentation of an Ii-dependent MHC class II-restricted epitope to the same extent as the wild type. In a parallel study, we investigated the effect of charge in the cytoplasmic tail of Ii. We find that due to exposed negative charges, it promotes endosome fusion events, and we suggest thatthis causes endosomal retention (Nordeng et al., Mol. Biol. Cell 2002). Together, the data reveal an additional property of the Iip33 cytoplasmic tail that contributes to the modulation of antigen processing and presentation. [source] Superconvergence and H(div) projection for discontinuous Galerkin methodsINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 10 2003Peter Bastian Abstract We introduce and analyse a projection of the discontinuous Galerkin (DG) velocity approximations that preserve the local mass conservation property. The projected velocities have the additional property of continuous normal component. Both theoretical and numerical convergence rates are obtained which show that the accuracy of the DG velocity field is maintained. Superconvergence properties of the DG methods are shown. Finally, numerical simulations of complicated flow and transport problem illustrate the benefits of the projection. Copyright © 2003 John Wiley & Sons, Ltd. [source] On robust control algorithms for nonlinear network consensus protocolsINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 3 2010Qing Hui Abstract Even though many consensus protocol algorithms have been developed over the last several years in the literature, robustness properties of these algorithms involving nonlinear dynamics have been largely ignored. Robustness here refers to sensitivity of the control algorithm achieving semistability and consensus in the face of model uncertainty. In this paper, we examine the robustness of several control algorithms for network consensus protocols with information model uncertainty of a specified structure. In particular, we develop sufficient conditions for robust stability of control protocol functions involving higher-order perturbation terms that scale in a consistent fashion with respect to a scaling operation on an underlying space with the additional property that the protocol functions can be written as a sum of functions, each homogeneous with respect to a fixed scaling operation, that retain system semistability and consensus. Copyright © 2009 John Wiley & Sons, Ltd. [source] | ||||||||||||||||