scholarly journals Special issue : trend resource recycling technology and the disposal of waste.Recovering nonferrous metals from wastes.The classification of nonferrous metals by a permanent magnet.

1990 ◽  
Vol 19 (6) ◽  
pp. 343-344
Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2830 ◽  
Author(s):  
Sandra Eriksson

Interest in permanent magnet synchronous machines (PMSMs) is continuously increasing worldwide, especially with the increased use of renewable energy and electrification of transports. This special issue contains the successful invited submissions of fifteen papers to a Special Issue of Energies on the subject area of “Permanent Magnet Synchronous Machines”. The focus is on permanent magnet synchronous machines and the electrical systems they are connected to. The presented work represents a wide range of areas. Studies of control systems, both for permanent magnet synchronous machines and for brushless DC motors, are presented and experimentally verified. Design studies of generators for wind power, wave power and hydro power are presented. Finite element method simulations and analytical design methods are used. The presented studies represent several of the different research fields on permanent magnet machines and electric drives.


2017 ◽  
Vol 76 (s1) ◽  
Author(s):  
Rossano Bolpagni ◽  
Mariano Bresciani ◽  
Stefano Fenoglio

This special issue stems from an increasing awareness on the key contribution made by biometrics and biological indices in the quality classification of aquatic ecosystems. This theme has been the subject of passionate debate during the 13th European Ecological Federation (EEF) and 25th Italian Society of Ecology’s (S.It.E.) joined congresses held in Rome in September 2015. In this frame, on the margins of the special symposium named “Biomonitoring: Lessons from the past, challenges for the future”, it was launched the idea of a special issue of the Journal of Limnology on the “aquatic” contributions presented at the conference. The present volume mainly reports these studies, enriched by few invited papers. Among the other things, the main message is the need of a better integration between sector knowledges and legislative instruments. This is even truer given the on-going climate change, and the necessity to record rapid changes in ecosystems and to elaborate effective/adaptive responses to them. 


Ethnicities ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 455-468 ◽  
Author(s):  
Linda Supik ◽  
Riem Spielhaus

In addition to serving as an introduction to the subject, this paper suggests a conceptual framework for the investigation of issues of classification and quantification related to migration and the ethnically and religiously diverse societies in Europe. Nationality, ethnicity and religion are situational, contextual and dynamic social phenomena which tend to defy rigid classification, making it especially difficult to capture and quantify these entities in order to organize and represent them in an intelligible manner in official statistics (e.g. censuses), institutional governing practices or in academic survey research. By drawing on previous work by demographers and social researchers, we suggest a typological classification of ways in which diverse populations become statistically visible or invisible. We show that the rationale for creating classifications and particular sets of categories changes, depending on the political field in which data are used in the governance of populations and migration. A science studies perspective can make these diverse taxonomies the object of studies to understand how they are embedded within, and how they sustain, power relations. By focusing on practices of classification as instruments of research and governance, this special issue contributes to a reflection on the conditions and effects of quantifying practices in culturally diverse and constantly changing societies, in which the line between government and academia, between power and knowledge, is frequently indistinct.


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