323,590 research outputs found
Sensorless Speed Control of Synchronous Reluctance Motor Drives Based on Extended Kalman Filter and Neural Magnetic Model
No full textDue to their robustness and adaptability, position estimators based on the extended Kalman filter have been used in permanent magnet synchronous motors for decades. The time has come to extend their use to reluctance motors as well and this work focuses on the elements that hinder the transition. All passes through the availability of an accurate and analytical magnetic model, which is obtained by Artificial Intelligence tools. It is proved that the sensorless control of synchronous reluctance motors using the extended Kalman filter is possible over broad speed and torque ranges. The experimental session compares different implementation possibilities, concluding with the proposal of a new hybrid algorithm that greatly reduces the computational load
Monitoring water relations in hazelnut plantations located in Dellapool, Narrandera (SE Australia) SUMMARY OF RESULTS FOR THE GROWING SEASON 2015-2016
No full textThe analysis on sap flows and stomatal conductance, together with the data collection of micro-meteorological parameters is of key importance for a deeper understanding on the soil-plant-atmosphere continuum. At the same time, a proper elaboration on these data can provide useful insights for the improvement of sustainable hazelnut management in dry areas such as SE Australia.
The study site, located in Dellapool, Narrandera (34°48’S, 146°40’E; 155 m.a.s.l), is characterized by severe vapor pressure deficit (VPD), twice the maximum value of hazelnut native habitat. Despite data gaps occurred along the period, we derived important parameters as VPD, the most important driver for sap flow. Results shows that, beyond 16hPa, VPD is not accompanied by the expected decline in sap flow, rather trees showed to have a consistent water loss despite stomatal closure at high VPD. Because of stomata closure and increased water loss, the potential productivity decline during the season could be estimated around 60%. In addition, remote calculation on soil holding capacity of water suggest a difficult water uptake in absence of frequent irrigation regime.
The correlation between stomatal conductance and carbon assimilation at leaf level resulted to be linear (R2 0.79). This suggest that modelling g could be predictive for the carbon assimilation. In the last section of the report, we provide an example of g modelling
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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