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21.
This paper is the second of three parts which describe the analysis and simulation of the grinding process. Generation of the workpiece surface depends on the interactions between the grains of the wheel and the workpiece. The grinding wheel surface generated by dressing was simulated by the method described in Part I. This part describes a method to investigate the process of grinding by simulating the cutting action of every grain which engages with the workpiece. Grinding forces are analysed by simulating the force on each grain which passes a section of the workpiece. The simulated workpiece surface shows features which are similar in nature to the experimental results. A more extensive comparison of simulated and experimental grinding behaviour is presented in Part III. 相似文献
22.
Two computational regimes of a single-compartment neuron separated by a planar boundary in conductance space 总被引:1,自引:0,他引:1
Recent in vitro data show that neurons respond to input variance with varying sensitivities. Here we demonstrate that Hodgkin-Huxley (HH) neurons can operate in two computational regimes: one that is more sensitive to input variance (differentiating) and one that is less sensitive (integrating). A boundary plane in the 3D conductance space separates these two regimes. For a reduced HH model, this plane can be derived analytically from the V nullcline, thus suggesting a means of relating biophysical parameters to neural computation by analyzing the neuron's dynamical system. 相似文献
23.
In this paper, we address the problem of agent loss in vehicle formations and sensor networks via two separate approaches: (1) perform a ‘self‐repair’ operation in the event of agent loss to recover desirable information architecture properties or (2) introduce robustness into the information architecture a priori such that agent loss does not destroy desirable properties. We model the information architecture as a graph G(V, E), where V is a set of vertices representing the agents and E is a set of edges representing information flow amongst the agents. We focus on two properties of the graph called rigidity and global rigidity, which are required for formation shape maintenance and sensor network self‐localization, respectively. For the self‐repair approach, we show that while previous results permit local repair involving only neighbours of the lost agent, the repair cannot always be implemented using only local information. We present new results that can be applied to make the local repair using only local information. We describe implementation and illustrate with algorithms and examples. For the robustness approach, we investigate the structure of graphs with the property that rigidity or global rigidity is preserved after removing any single vertex (we call the property as 2‐vertex‐rigidity or 2‐vertex‐global‐rigidity, respectively). Information architectures with such properties would allow formation shape maintenance or self‐localization to be performed even in the event of agent failure. We review a characterization of a class of 2‐vertex‐rigidity and develop a separate class, making significant strides towards a complete characterization. We also present a characterization of a class of 2‐vertex‐global‐rigidity. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
24.
Yixing Tian Huiling Liu Brian W.Sheldon Thomas J.Webster Sichen Yang Huilin Yang Lei Yang 《材料科学技术学报》2019,35(5):817-823
Nanostructured diamond have potential applications in many biomedical related fields and demonstrated extraordinary capacity to influence cellular responses. Studying the surface property of nanodiamond and its influence to protein adsorption and subsequent cellular responses along with the mechanism behind such capacity becomes more important. Here the role of surface energy associated with nanostructured diamond in modulating fibronectin and osteoblast(OB, bone forming cells) responses was investigated. Nanocrystalline diamond(NCD) and submicron crystalline diamond(SMCD) films with controllable surface energy were prepared by microwave-enhanced plasma chemical vapor deposition(MPCVD) techniques. Fibronectin adsorption on the diamond films with varied surface energy values was measured via the enzyme-linked immunosorbent assay(ELISA) and the relationship between the surface energy and fibronectin adsorption was studied. The result indicated that fibronectin adsorption on nanostructured surfaces was closely related to both surface energy and material microstructures. The spreading and migration of OB aggregates(each containing 30–50 cells) on the NCD with varied surface energy values were also studied. The result indicates a correlation between the cell spreading and migration on nanodiamond and the surface energy of nanostructured surface. 相似文献
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It has recently been proposed that classical music has a fractal nature. A reanalysis of this proposal reveals some logical flaws in the argument. Chaos, fractals, time series and Schenkerian analysis are contrasted and inter-related. Further consideration of Bach's Invention No 1 (BWV772) leads to the conclusion that there is no inherent fractal nature in classical music; although the converse is not true. In other words, it is feasible to use fractal ideas to compose musical pieces — an area of much interest in recent years.
Brian Henderson-Sellers is Associate Professor in the School of Information Systems at the University of New South Wales. His research interests span object-oriented information systems and environmental simulation modelling. Over the last three years, he has begun to integrate his software and musical interests in a collaboration, supported by the Australia Council for the Arts, with Greg White in the compositional use of object technology and strange attractors. Their first composition together was premiered in October 1992. He has, amongst other books, published A Book of Object-oriented Knowledge,Prentice Hall.
David Cooper is a lecturer and director of the electronic studio in the Music Department of the University of Leeds. He is a composer with a special interest in the music of Bela Bartok. He has recently been appointed technical director of the English University Funding Council Teaching and Learning Technology project in music which is producing multi-media computer-based learning packages. Publications include A Pascal MIDI Library for the Atari ST, Musicus,1, 2 (1989), and A Computationally Non-intensive Algorithm for Pitch Recognition, Array,12, 2 (1992). 相似文献
28.
Approximately 75% of the PAF present in saliva is recovered on extraction of whole saliva (0.8 vol) with chloroform/methanol/water
(2∶2∶1 v/v/v). PAF levels, determined by our recently developed radioimmunoassay, in saliva extracts ranged from 0.5–21 ng/mL
with 59% between 2–6 ng/mL. These figures, for apparently healthy subjects, are higher than previously reported levels obtained
by platelet assays. The validity of our radioimmunoassay results was checked by isolating and quantitating the PAF fraction
from whole saliva. In addition, when we examined our saliva samples by platelet aggregation, low levels of PAF, comparable
with the values found in the literature, were detected. Investigations revealed the presence of a substance(s) which inhibited
PAF-induced platelet aggregation but which did not affect the radioimmunoassay. 相似文献
29.
MacDonald Angus W. III; Goghari Vina M.; Hicks Brian M.; Flory Janine D.; Carter Cameron S.; Manuck Stephen B. 《Canadian Metallurgical Quarterly》2005,19(6):814
Convergent and divergent validity are critically important in developing psychological measures that reveal interpretable deficits in disordered populations. This article reports on 2 studies that evaluated the validity of context processing measures. In Experiment 1, a confirmatory factor analysis of data from 481 healthy adults established the convergent validity of 2 context processing measures and showed that context processing accounted for significant amounts of variance in standard IQ and working memory measures. In Experiment 2, 20 schizophrenia patients, 16 of their healthy siblings, and 28 controls were evaluated using a novel, short context processing measure, the dot pattern expectancy (DPX) task. The DPX was sensitive to specific deficits in schizophrenia patients and their healthy siblings. These findings support the construct validity of context processing measures, suggest context processing is a component of intellectual functioning, and demonstrate that brief context processing measures remain sensitive to psychopathological deficits. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
30.
Conducted 3 experiments with a total of 280 undergraduates in which content word constituents were reassigned arbitrarily to different sentences in lists of simple sentences. Original and substituted sentences were rated for imagery, comprehensibility, and sensibleness and, in Exps II and III, were tested also for incidental and intentional recall. Substitutions produced a greater ratings decrement for concrete than for abstract sentences, reversing in some cases a comprehensibility and sensibleness superiority found for the original concrete sentences. This finding supports the hypothesis that greater selection restrictions are associated with concrete than with abstract concepts. Consistent with the notion that imaginal coding is relatively insensitive to semantic constraint violations, smaller rating decrements were produced by substitutions under an imaginal coding set than under either a comprehension or a sensibleness set. Differences in constraints fail to account for concrete/abstract differences in recall as indicated by the finding of an unqualified recall superiority for concrete material under all conditions of substitution. (French summary) (27 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献