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71.
Leonard D. Mlodinow Ion O. Stamatescu 《International journal of parallel programming》1985,14(4):201-219
We discuss an evolutionary procedure for machine learning and present in detail an application of this procedure to the control of a robot TURTLE; which, beginning from a state of total ignorance, is able to develop the ability to circumnavigate a variety of obstacles. 相似文献
72.
Ion C. Baianu Leroy F. Johnson David K. Waddell 《Journal of the science of food and agriculture》1982,33(4):373-383
The first high-field and high-resolution proton, carbon-13 and nitrogen-15 nuclear magnetic resonance (n.m.r.) spectra of gliadin solutions are reported. Collective assignments are proposed based on ‘random coil’ chemical shifts and amino acid analysis of gliadins. Additional information from X-ray diffraction, photoacoustic spectroscopy, dielectric relaxation and electrophoretic measurements is considered in the interpretation of the n.m.r. spectra. Marked changes in the n.m.r. spectra of gliadin solution were observed with increasing concentration or temperature. An interpretation of these effects in molecular terms is proposed and the practical implications of n.m.r. measurements for wheat variety identification and correlation with rheological testing indicated. The relevance of the results to studies of glutens is also noted. 相似文献
73.
Ioan Alin Bucurica Ion V Popescu Cristiana Radulescu Gheorghe Valerica Cimpoca Ioana-Daniela Dulama Sofia Teodorescu Ion Valentin Gurgu Dorin Dacian Let 《Bulletin of Materials Science》2018,41(3):71
Quartz crystal microbalance (QCM) is known as a very sensitive device used for determination of mass quantity adsorbed on sensor surface. Its detection limits are in the range of ng cm\(^{-2}\). The adsorption mechanism of metallic nanoparticles on QCM sensor was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). This study aims to highlight the importance of QCM applications in nanoparticles deposition field. The layers formed through adsorption process, induced by the oscillations of the QCM sensor, were investigated by AFM for surface topography and for particle mean size values. The morphology of layers and nanoparticles dimensions were determined by SEM. For a more complex investigation of the nanoparticles adsorption mechanism, the chemical composition of layers was achieved using SEM coupled with energy dispersive X-ray spectrometer (SEM-EDS). This preliminary research involved a new approach in characterization of metallic nanoparticles layers to achieve functional assembled monolayers. 相似文献
74.
Evolving improvised ideation from humour constructs: A new method for collaborative divergence
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Gillian Hatcher William Ion Ross Maclachlan Marion Marlow Barbara Simpson Andrew Wodehouse 《Creativity & Innovation Management》2018,27(1):91-101
This paper reviews and applies key principles from improvised comedy (“improv”) to overcome common barriers in effective group ideation, resulting in the formulation and presentation of a new creative idea generation method. The emergence of an innovative product design can be compared to the telling of a funny joke: both combine seemingly unconnected ideas in a way that is both surprising and satisfying. Our research expands upon this link between humour and creativity, and operationalizes the improv principles best suited to the conceptual design process. A workshop‐based methodology was used to select, develop, and refine the method protocol and facilitation technique. Participant feedback and observations have demonstrated how this approach can expand the solution space to support the generation of bold, innovative ideas. Finally, we present a step‐by‐step guide for the new “design improv” method and discuss its potential value in the generation of creative ideas in a group ideation context. 相似文献
75.
The potential differences in bone repair of calvaria defects treated with a collagen sponge (HELISTAT) or a collagen-hydroxyapatite composite (HEALOS) in young and aged rats were evaluated at 8 weeks after surgery. A histomorphometric analysis of new bone formation and an evaluation of angiogenesis, mast cell, and eosinophil local infiltration were performed. Evaluation showed that HELISTAT induced a similar amount of new bone in both young and aged rats. However this occurred to a lesser degree than in young rats treated with HEALOS. The largest number of blood vessels was present in the defects of aged rats treated with HEALOS, and the number of mast cells was highest in the defects treated with HELISTAT in both young and aged rats. Eosinophils were present to the greatest extent in defects treated with HEALOS in comparison to defects treated with HELISTAT in both young and aged rats. Collagen-hydroxyapatite composite (HEALOS) enhances calvarial bone repair more than collagen sponge alone (HELISTAT) in young rats but not in aged rats at 8 weeks after surgery. HEALOS appears to induce a more intense inflammatory response than HELISTAT especially in aged rats. 相似文献
76.
R. Alexandrescu I. Morjan R. Birjega I. Soare I. Voicu F. Dumitrache E. Vasile 《Thin solid films》2007,515(24):8438-8445
Undoped and Fe-doped TiO2 nanopowders with Fe/Ti (atomic ratio) precursor concentration ranging from 7% up to 25% have been prepared by the IR laser pyrolysis technique. A sensitized mixture of TiCl4 and Fe (CO)5 was used as titanium and iron precursor, respectively. Reference undoped titania samples with a major concentration of anatase phase (about 90%) were obtained by the same technique by using very high flows of the oxidizing agent (air). The effects of the iron-dopant concentration on the essential structural properties of the resultant powders such as the phase formation, the crystallinity, the average particle size and distributions were systematically investigated by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. The decrease of the TiO2-anatase crystalline phase, the simultaneous increase of the amorphous phase and the decrease in size of particle mean diameter appear as main effects induced by the Fe-dopant concentration. 相似文献
77.
Aromatic polyimide films are processed from polyamic acid solutions. This process involved the simultaneous loss of solvent and chemical conversion of polyamic acid to polyimide, and implied structural reorganization which led to changed physical properties. Polymer films generated from benzophenonetetracarboxylic dianhydride and 4,4′-diamino-3,3′-dimethyl diphenylmethane have been investigated at different stages of thermal treatment. The surface polarity, which was determined by the presence of polar COOH and CONH groups, changed during polyamic acid thermal treatment. These polar groups were removed step by step by imidization process leading to the modification of the physical properties of the polymer film. 相似文献
78.
In this study, new exact Green’s functions and a new exact Green-type integral formula for a boundary value problem (BVP) in thermoelasticity for some spherical wedges with mixed homogeneous mechanical boundary conditions are derived. The thermoelastic displacements are subjected to a heat source applied in the inner points of the spherical wedges and to a mixed non-homogeneous boundary heat conditions. When the thermoelastic Green’s function is derived, the thermoelastic displacements are generated by an inner unit point heat source, described by Dirac’s δ-function. All results are obtained in elementary functions that are formulated in a special theorem. Exact solutions in elementary functions for two particular BVPs of thermoelasticity for spherical wedges also are included. In these particular BVPs, the thermoelastic displacements are subjected to a constant temperature (in the first particular BVP) or to a constant heat source (in the second particular BVP). In both BVPs, the constant temperature or the constant heat source is given on the segment of the radius of the quarter-space. On the boundary half-planes of the quarter-space zero temperature and zero heat flux are prescribed. 相似文献
79.
Ion Tiseanu Matej Mayer Teddy Craciunescu Antti Hakola Seppo Koivuranta Jari Likonen Cristian Ruset Cosmin Dobrea 《Surface & coatings technology》2011
Tungsten erosion, its subsequent transport and redeposition are of great interest, because a full tungsten divertor is foreseen to be used during the deuterium–tritium operational phase of ITER. The erosion of tungsten and carbon marker layers was extensively studied in the outer divertor of ASDEX Upgrade (AUG), and work is currently in progress to completely replace the existing JET CFC tiles with tungsten-coated tiles within the JET ITER-like wall project. The need for fast and non-destructive method which allows the quantitative determination of the thickness of a tungsten coating on a carbon material on large areas led us to evaluate a combined absorption/fluorescence X-ray (XRTF) technique. The method can provide fast analysis, high spatial resolution and a material selective detection of deposited layers and inclusions. It was applied on W coated fine grain graphite (FGG) tiles from AUG's divertor. It is proved that the method is able to provide information about the uniformity of the tungsten coating on a graphite or CFC substrate whilst the technique can be used to determine the thickness of the tungsten and other marker materials coatings. It represents a unique instrument for the post-mortem analysis of the coatings. 相似文献
80.