Eindhoven University of Technology

About: Eindhoven University of Technology is a education organization based out in Eindhoven, Noord-Brabant, Netherlands. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 22309 authors who have published 52936 publications receiving 1584164 citations. The organization is also known as: Technische Hogeschool Eindhoven & TU/e.

Modeling and Analysis of Grid Harmonic Distortion Impact of Aggregated DG Inverters

Abstract: This paper proposes an impedance-based analytical method for modeling and analysis of harmonic interactions between the grid and aggregated distributed generation (DG) inverters. The root cause of harmonic interaction/resonance problems is the impedance-network quasi-resonance between the effective output impedance of the inverter and the equivalent grid impedance at the connection point. Starting with the output impedance modeling of an inverter, a Norton model of the inverter is derived. Comparing with the switching model and the average model of the inverter, simulation results show the effectiveness of the model. This paper proposes that impedance limits should be specified and used as an extra design constraint for DG inverters in order to minimize the harmonic distortion impact on the grid. Assuming the impedance models of individual inverters and local loads within a distribution grid are known, especially in the case of new grids under construction, harmonic interactions between the grid and a certain number of DG inverters can be preliminarily estimated.

Investigation of the Living Cationic Ring-Opening Polymerization of 2-Methyl-, 2-Ethyl-, 2-Nonyl-, and 2-Phenyl-2-oxazoline in a Single-Mode Microwave Reactor†

Abstract: The living cationic ring-opening polymerizations of 2-methyl-, 2-ethyl-, 2-nonyl-, and 2-phenyl-2-oxazoline were performed in acetonitrile at high temperatures of up to 200 °C in a single-mode microwave reactor. Upon enhancing the reaction rates by factors of up to 400 in the range from 80 to 200 °C, the first-order kinetics of the monomer consumption and the livingness of the polymerization were maintained. As a consequence of the fast, direct, and noncontact heating by the microwave irradiation, the polymerizations could be carried out in highly concentrated solutions or even from bulk conditions, yielding well-defined polymers (PDI < 1.20). Under the conditions applied in this study, a maximum number of 300 monomers (100 in the case of 2-methyl- and 2-nonyl-2-oxazoline) could be incorporated into the polymer chains under the premise that the average molecular weight distributions remained narrow (PDI < 1.20).

Complementarity in R&D cooperation strategies

Abstract: This paper assesses the performance effects of simultaneous engagement in R&D cooperation with different partners (competitors, clients, suppliers, and universities and research institutes). We test whether these different types of R&D cooperation are complements in improving productivity. The results suggest that the joint adoption of cooperation strategies could be either beneficial or detrimental to firm performance, depending on firm size and specific strategy combinations. Customer cooperation helps to increase market acceptance and diffusion of product innovations and enhances the impact of competitor and university cooperation. On the other hand, smaller firms also face diseconomies in pursuing multiple R&D cooperation strategies, which may stem from higher costs and complexity of simultaneously managing multiple partnerships with different innovation objectives.

Interorganizational workflows: An approach based on message sequence charts and petri nets

Abstract: To date, workflow management focuses on improving the effectivity and efficiency of business processes within one organization. However, today’s corporations are challenged to cross organizational boundaries. Phenomena such as electronic commerce, extended enterprises and the Internet stimulate the cooperation between organizations. Therefore, it is interesting to consider workflows distributed over a number of organizations. Interorganizational workflow offers companies the opportunity to re-shape business processes beyond the boundaries of individual organizations. In this paper, we use message sequence charts to specify the interaction between organizations. Petri nets are used to model the workflows inside each organization. Two challenging problems related to interorganizational workflow are tackled in this paper: (1) What are the minimal requirements any interorganizational workflow should satisfy?, and (2) How to decide whether an interorganizational workflow (modeled in terms of Petri nets) is consistent with the interaction structure specified in terms of a message sequence chart?