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排序方式: 共有139条查询结果,搜索用时 15 毫秒
1.
Derek A. Paley Naomi Ehrich Leonard Rodolphe Sepulchre 《Systems & Control Letters》2008,57(3):209-215
We provide a cooperative control algorithm to stabilize symmetric formations to motion around closed curves suitable for mobile sensor networks. This work extends previous results for stabilization of symmetric circular formations. We study a planar particle model with decentralized steering control subject to limited communication. Because of their unique spectral properties, the Laplacian matrices of circulant graphs play a key role. We illustrate the result for a skewed superellipse, which is a type of curve that includes circles, ellipses, and rounded parallelograms. 相似文献
2.
We explore in this paper the relation between activities, communication channels and media, and common ground building in
global teams. We define re-representation as a sequence of representations of the same concept using different communication
channels and media. We identified the re-representation technique to build common ground that is used by team members during multimodal and multimedia communicative events in cross-disciplinary,
geographically distributed settings. Our hypotheses are as follows: (1) Significant sources of information behind decisions
and request for actions are embedded within the fabric of communicative events in which participants use both informal and
formal media to express their ideas. Capturing these information sources can facilitate common ground building and accelerate
the execution of action requests. (2) Re-representations of concepts, i.e., sequences of representations using diverse media
and communication channels, mediate and accelerate common ground building. (3) The use of intra- or interdisciplinary re-representations
correlates with high team performance, i.e., effective team process and high product quality. We used AEC Global Teamwork
course offered in 2008–2009 as the testbed for our study to validate our hypothesis. 相似文献
3.
Output synchronization of a network of heterogeneous linear state–space models under time-varying and directed interconnection structures is investigated. It is shown that, assuming stabilizability and detectability of the individual systems and imposing very mild connectedness assumptions on the interconnection structure, an internal model requirement is necessary and sufficient for synchronizability of the network to polynomially bounded trajectories. The resulting dynamic feedback couplings can be interpreted as a generalization of existing methods for identical linear systems. 相似文献
4.
Stefan Linsinger Matthias Eul Christian Schwickert Rodolphe Decourt Bernard Chevalier Ute Ch. Rodewald Jean-Louis Bobet Rainer Pöttgen 《Intermetallics》2011,19(10):1579-1585
New ordered Laves phases RENi4Mg (RE = Sc, Sm, Tb–Lu) were synthesized from the elements in sealed tantalum ampoules in an induction furnace. Six of the structures were refined on the basis of X-ray single crystal data. The diffraction experiments gave hint for small homogeneity ranges RE1+xNi4Mg1?x. Magnetic susceptibility measurements show Curie–Weiss behavior for RE = Gd, Dy, Ho, Tm, Yb and the resulting effective magnetic moments suggest both stable trivalent states for all RE and a non-magnetic state for Ni. Gd1+xNi4Mg1?x (x ≈ 0.12) orders antiferromagnetically at a Néel temperature of TN = 4.6(5) K. Resistivity measurements reflect the metallic nature of these compounds. 相似文献
5.
Annals of Telecommunications - This paper presents a new consensus algorithm, Proof of Usage (PoU), for the blockchain technology. This consensus is introduced for permissioned (or private)... 相似文献
6.
Immobilised DNA-oligo layers are scientifically and technologically appealing for a wide range of sensor applications such as DNA chips. Using microcantilever-based sensors with integrated readout, we demonstrate in situ quantitative studies of surface-stress formation during self-assembly of a 25-mer thiol-modified DNA-oligo layer. The self-assembly induces a surface-stress change, which closely follows Langmuir adsorption model. The adsorption results in compressive surface-stress formation, which might be due to intermolecular repulsive forces in the oligo layer. The rate constant of the adsorption depends on the concentration of the oligo solution. Based on the calculated rate constants a surface free energy of the thiol-modified DNA-oligo adsorption on gold is found to be -32.4 kJ mol(-1). The adsorption experiments also indicate that first a single layer of DNA-oligos is assembled on the gold surface after which a significant unspecific adsorption takes place on top of the first DNA-oligo layer. The cantilever-based sensor principle has a wide range of applications in real-time local monitoring of chemical and biological interactions as well as in the detection of specific DNA sequences, proteins and particles. 相似文献
7.
8.
Cristian S. Campos-Fernández Bradley W. Smucker Rodolphe Clérac Kim R. Dunbar 《Israel journal of chemistry》2001,41(3):207-218
Reactions of 2,3,5,6-tetra(2-pyridyl) pyrazine (tppz) with [ML6][X]2 (L = CH3CN, H2O;X = [BF4]−, [ClO4]−, [NO3]− [BArF]−(BArF - B[3,5-C6H3(CF3)2]4) lead to the high-yield formation of mononuclear [M(tppz)2]2+, (M = MnII, FeII, CoII, and NiII) and dinuclear [Ni2(tppz)(CH3CN)6]4+ species. The new compounds were fully characterized by X-ray crystallographic, spectroscopic, and magnetic susceptibility measurements. Surprisingly, the 2:1 M:tppz reactions did not lead to isolation of the dinuclear species except in the case of Ni(II). It was further noted that even in the case of the Ni reactions, the nuclearity of the product depends on the choice of anions and the reaction conditions. Magnetic measurements of the mononuclear species [Co(tppz)2]2+ revealed thermally induced spin-crossover behavior from a high-spin S = 3/2 at higher temperatures to a low-spin S = 1/2 complex at lower temperatures. The dinuclear compound [Ni2(tppz)(CH3CN)6]4+ exhibits a weak anti-ferromagnetic interaction through the bridging tppz ligand. 相似文献
9.
Rodolphe Buda 《Computational Economics》2008,31(4):397-408
The aggregation procedure is an important theoretical and empirical topic of economics. It appears in the Microeconomics and
Macroeconomics, in Panel and Cross-Sectional Data Analysis, in Data Mining Analysis, in Input–Output and Agent-based Computational
Economics Modelling. The question of the choice of algorithm is became important since the size of the sample data has became
more important, and despite of the speed of the computers. In this paper we present the “classical” algorithm (the “matrix
algebraic” one) of aggregation of the two-dimensional sample data, and compare it to the alternative algorithms (the “vectorial”
one) we developed. Then we present some extensions to the multidimensional aggregation.
相似文献
10.
Meinier Romain Fellah Mahdi Sonnier Rodolphe Zavaleta Pascal Suard Sylvain Ferry Laurent 《Fire Technology》2022,58(2):689-707
Fire Technology - The ignition of four different PVC-based electric cables was studied using cone calorimeter and the influence of the charring phenomenon on ignition was investigated. The... 相似文献