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排序方式: 共有103条查询结果,搜索用时 15 毫秒
1.
Antonio S. Santos Arnaldo C. Pereira Maria D. P. T. Sotomayor César R. T. Tarley Nelson Durán Lauro T. Kubota 《Electroanalysis》2007,19(5):549-554
This work evaluated an amperometric biosensor based on multi‐wall carbon nanotubes (MWCNT), chemically modified with methylene blue (Met) and horseradish peroxidase (HRP), for detection of phenolic compounds. The dependences of the biosensor response due to the enzyme immobilization procedure, HRP amounts, pH and working potential were investigated. The amperometric response for catechol using the proposed biosensor showed a very wide linear response range (1 to 150 μmol L?1), good sensitivity (50 nA cm?2 μmol?1 L), excellent operational stability (after 300 determinations the response remained at 97%) and very good storage stability (lifetime>3 months). Based on all these characteristics, it is possible to affirm that the material is promising for phenol detection due to its good electrochemical response and enzyme stabilization. The biosensor response for various phenolic compounds was investigated. 相似文献
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Each woman indicates a set of acceptable men. Following a line, each man selects his favorite woman among those available to him and to whom he is acceptable. Roth (1982) imposes that women select the whole set of men and Alcalde et al (2000) restrict the choices of women to singleton. We relax these restrictions by allowing women to select any set of men and investigate how this change affects the strategic structure of the games induced by the old procedures. 相似文献
4.
Silvânia Marilene de Lima Jorge Antonio Gómez Valéria P. Barros Greice de S. Vertuan Marilda das Dores Assis Carlos Frederico de Oliveira Graeff Grégoire Jean-François Demets 《Polyhedron》2010
This work presents a new oxovanadium(IV)–cucurbit[6]uril complex, which combines the catalytic properties of the metal ion with the size-excluding properties of the macrocycle cavity. In this coordination compound, the VO2+ ions are coordinated to the oxygen atoms located at the rim of the macrocycle in slightly distorted square-pyramidal configurations, which are in fact C2v symmetries. This combination results in a size-selective heterogeneous catalyst, which is able to oxidize linear alkanes like n-pentane at room temperature, but not styrene, cyclohexane or z-cyclooctene, which are too big to enter the cucurbit[6]uril cavity. The results presented here contribute to understanding the mechanism of alkane catalytic oxidation by oxovanadium(IV) complexes. 相似文献
5.
J. Sotomayor 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1990,41(2):306-310
Summary A method based on differential equations to evaluate the inverse mapping as well as to estimate the extension of its maximal star shaped domain is proposed here. The size of the domain of univalence, restricted to which the mapping is a diffeomorphism, is also estimated. 相似文献
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C. Guasch C.M. Sotomayor Torres N.N. Ledentsov D. Bimberg V.M. Ustinov P.S. Kop'ev 《Superlattices and Microstructures》1997,21(4):509-516
Resonant luminescence studies of InAs quantum dots (QDs) embedded in a GaAs matrix grown by molecular beam epitaxy are presented, showing marked differences for modulation-doped and undoped QDs and indicating that the doping leads to different exciton formation and carrier relaxation mechanisms. The LO-phonon assisted relaxatioin of excitons between sub-levels is identified for the modulation-doped QDs. 相似文献
8.
We analyze the manipulability of competitive equilibrium allocation rules for the simplest many-to-many extension of Shapley and Shubik’s (Int J Game Theory 1:111–130, 1972) assignment game. First, we show that if an agent has a quota of one, then she does not have an incentive to manipulate any competitive equilibrium rule that gives her her most preferred competitive equilibrium payoff when she reports truthfully. In particular, this result extends to the one-to-many (respectively, many-to-one) models the Non-Manipulability Theorem of the buyers (respectively, sellers), proven by Demange (Strategyproofness in the assignment market game. École Polytechnique, Laboratoire d’Économetrie, Paris, 1982), Leonard (J Polit Econ 91:461–479, 1983), and Demange and Gale (Econometrica 55:873–888, 1985) for the assignment game. Second, we prove a “General Manipulability Theorem” that implies and generalizes two “folk theorems” for the assignment game, the Manipulability Theorem and the General Impossibility Theorem, never proven before. For the one-to-one case, this result provides a sort of converse of the Non-Manipulability Theorem. 相似文献
9.
M. Teresa Barros Ana I. Mouquinho Krasimira T. Petrova Mara D. Saavedra João C. Sotomayor 《Central European Journal of Chemistry》2011,9(4):557-566
It has been reported that the length of the molecular chain and the rigidity of molecules influence the structure of the polymer
network in PDLC films and hence the electro-optical properties of the composites. Herein, a series of new aromatic monomeric
monomethacrylates, bismethacrylates and monovinylbenzene derivatives with a mesogenic core were successfully synthesized under
microwave irradiation. The microwave assisted synthesis resulted in decreased reaction times, reduced solvent requirement,
increased operational simplicity, and in most cases, improved yields and selectivity.
相似文献
10.
Marilda Sotomayor 《International Journal of Game Theory》2011,40(3):631-644
In a decentralized setting the game-theoretical predictions are that only strong blockings are allowed to rupture the structure
of a matching. This paper argues that, under indifferences, also weak blockings should be considered when these blockings
come from the grand coalition. This solution concept requires stability plus Pareto optimality. A characterization of the
set of Pareto-stable matchings for the roommate and the marriage models is provided in terms of individually rational matchings
whose blocking pairs, if any, are formed with unmatched agents. These matchings always exist and give an economic intuition
on how blocking can be done by non-trading agents, so that the transactions need not be undone as agents reach the set of
stable matchings. Some properties of the Pareto-stable matchings shared by the Marriage and Roommate models are obtained. 相似文献