New combinations in Lactifluus, 2 : L. subg. Gerardii

In this second of a series of three papers, new combinations in the genus Lactifluus are proposed. This paper treats Lactarius subg. Gerardii (proposed here as new combination in Lactifluus). In this subgenus 17 combinations at species level are proposed

Development of a model-based optimal control strategy of Centrifugal Chiller System

2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Two-electron-satellite transition of donor bound exciton in ZnO: Radiative Auger effect

Two-electron-satellite (TES) transition of donor bound exciton (D 0X) is an interesting many-body quantum process. In this letter, precise luminescence spectra and temperature behaviors of the TES transition of aluminum bound exciton in two kinds of zinc oxide single crystals were investigated in detail. It is found that the TES transition can be treated as a radiative Auger process in which the temperature dependence of the emission intensity of the transition can be fitted very well with a model taking into account the temperature dependent Auger term and thermal dissociation of the D0X excitons. © 2013 AIP Publishing LLC.published_or_final_versio

A negotiation protocol to support agent argumentation and ontology interoperability in MAS-based virtual enterprises

The virtual enterprise (VE), which is formed according to some business opportunities through the collaboration of supply chain partners, is an effective way of business operation in the dynamic global market. This paper proposes an automated negotiation protocol for multi-agent system (MAS) based virtual enterprises. Firstly, to facilitate the functional integration of VEs, a MAS framework is developed to represent the whole life cycle of VEs. Secondly, a negotiation protocol supporting agent argumentation and ontology interoperability between agents is designed to handle the one-to-many negotiation scenarios in the VE context. The negotiation ontology is defined to combine the negotiation domain knowledge. Meanwhile, the ontology interoperability and agent argumentation mechanism is illustrated to ensure agents' mutual understandings. Finally, the proposed MAS framework is implemented upon the JADE platform. Simulation experiments are carried out to verify the agent interaction sequences in the negotiation protocol. © 2010 IEEE.published_or_final_versionThe 7th International Conference on Information Technology: New Generations (ITNG 2010), Las Vegas, NV., 12-14 April 2010. In Proceedings of the 7th ITNG, 2010, p. 448-45

A MAS framework for the negotiation based operational integration of virtual enterprises

The virtual enterprise (VE) is an effective way of business operation in the dynamic global market. This paper proposes a multi-agent system (MAS) framework for the negotiation based operational integration of VEs. Firstly, integrating the major VE operational activities into agent functions, a MAS framework is developed to represent the whole life cycle of VEs. Secondly, a negotiation protocol supporting agent argumentation is designed to handle the partner selection and conflict solving negotiation scenarios in the VE context. Finally, the proposed MAS framework is implemented upon the JADE platform. Simulation experiments have been carried out to verify the agent interaction sequences in the negotiation protocol. ©2010 IEEE.published_or_final_versionThe 4th Annual IEEE Systems Conference, 2010, San Diego, CA., 5-8 April 2010. In Conference Proceedings, 2010, p. 535-54

Optimal control of multi-zone vav air-conditioning system

2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Parity anomaly of bound states and optical properties in semiconductor superlattices with structural defects

We investigate the property of the bound states with an infinite number of classical turning points in the semiconductor superlattices (SL’s) with the double-barrier and double-well structural defects. The anomalous parity sequence of these bound states violating the conventional parity rule is predicted. A physical mechanism on the origin of the bound states in the structural defect SL’s, different from the mechanism addressed in the previous literature, is proposed. Based upon it, the parity anomaly can be interpreted very well. In addition, we also study the property of the optical transition in this system, for instance, the evaluation of the optical transition probability from the bound states to the bound states, from the bound states to the delocalized scattering states, and from the scattering states to other scattering states, in detail.published_or_final_versio

Electronic states and magnetotransport in quantum waveguides with nonuniform magnetic fields

The electronic states and magnetotransport properties of quantum waveguides (QW’s) in the presence of nonuniform magnetic fields perpendicular to the QW plane are investigated theoretically. It is found that the magnetoconductance of those structures as a function of Fermi energy exhibits stepwise variation or square-wave-like oscillations, depending on the specific distributions (both in magnitude and direction) of nonuniform magnetic fields in QW’s. We have investigated the dual magnetic strip structures and three magnetic strip structures. The character of the magnetotransport is closely related to the effective magnetic potential and the energy-dispersion spectrum of electron in the structures. It is found that dispersion relations seem to be combined by different sets of dispersion curves that belong to different individual magnetic subwaveguides. The magnetic effective potential leads to the coupling of states and the substantial distortion of the original dispersion curves at the interfaces in which the abrupt change of magnetic fields appears. Magnetic scattering states are created. Only in some three magnetic strip structures, these scattering states produce the dispersion relations with oscillation structures superimposed on the bulk Landau levels. It is the oscillatory behavior in dispersions that leads to the occurrence of square-wave-like modulations in conductance.published_or_final_versio

Laser micro-machining of three-dimensional microstructures in optical materials

We demostrate an advanced precision cutting tool using a 349 nm nanosecond pulsed UV laser micromachining setup. After expansion and collimation, the laser beam is directed vertically and focused with a high performance triplet lens. With an Al mirror inserted in the path of the convergent beam, the beam can be focused on a horizontal machining plane at any desired tilting angles. Microstructures of a wide range of geometries on hard materials can be formed using this custom machining method. Conventional linear and rotary machining on sapphire materials have been demonstrated.published_or_final_versionThe 2009 Spring Meeting of the Materials Research Society (MRS), San Francisco, CA., 13-17 April 2009. In Materials Research Society Symposium Proceedings, 2009, v. 1179, p. 99-10

The contribution of sidewall light extraction to efficiencies of polygonal light-emitting diodes shaped with laser micromachining

The light extraction efficiencies of InGaN/GaN blue light-emitting diodes (LEDs) of different geometries ranging from a triangle to a decagon have been simulated by ray-tracing. The conventional rectangular LED was found to be the most inefficient among the investigated polygons, and light extraction through the device sidewalls was the key factor. The results were experimentally verified by fabricating LEDs shaped into polygons by nanosecond-pulsed laser micromachining, which proved the simulated results. The mechanism of light extrac-tion in polygonal LEDs is discussed in detail. © 2010 American Institute of Physics.published_or_final_versio