Arc plasma fabricated phase shifter elements
It has been established that the arc plasma process can be used to fabricate ferrite phasors. The resultant ferrite-dielectric composite, except for the coercive force, has excellent microwave device characteristics. With the advent of a dielectric possessing optimum temperature coefficient of expansion, a phasor can be arc plasma sprayed which will be economical and exhibit the required device performance for phased arrays. The greatest economic impact of the arc plasma is expected to be in phasors requiring thin ferrite walls, since these are more difficult to fabricate by current processes and can be arc plasma fabricated at rapid rates. It should be noted that to achieve low cost phasors with the arc plasma technique, massive production numbers of phasors (in excess of 100,000 units) (6), are not required. That is, one can arc plasma fabricate a relatively small number of phasors and still maintain the economics of this technique.
Non-Reciprocal Ferrite Phase Shifters for Millimeter Applications
The design, fabrication and evaluation of 35 GHz, 65 GHz and 94 GHz non-reciprocal, ferrite latching phase shifters is described. These devices are waveguide structures which utilize the novel arc plasma spray (APS) process for fabricating the lithium ferrite toroids used in these phasors in order to achieve low cost and high performance. Currently, APS techniques are being developed to produce hybrid integrated phasor assemblies for use in millimeter phased array RADARs operating up to 94 GHz and possibly higher.
Students as promoters of rural extension in aquaculture in the Marajó archipelago, Pará, Brazil
Aquaculture is the creation of aquatic organisms. An expanding activity, being of great importance its approach in rural extension. Thus, the objective of this study was to analyze the contribution of extension activities in aquaculture in the professional training of students in Marajó, Amazon, Brazil. The project “Technology transfer through training and technical assistance for tambaqui breeders, Colossoma macropomum, in the archipelago of Marajó/PA” was developed by 10 technician and under graduate students from rural education course and the technical course in aquaculture from the Federal Institute of Education, Science and Technology of Pará (IFPA) Campus Breves, in the city of Curralinho. They participated in the stages of data collection in aquaculture enterprises, training for producers and monitoring of aquaculture production, acting as researchers, instructors and extension workers, respectively. The duration of the project was from August 2019 to March 2020. At the end of the project, a questionnaire was applied to the students involved. The results showed that the aquaculture extension activities developed were relevant and significant, for the construction of knowledge in a mutual way between those involved (students and aquaculture producers). The acquired experiences will substantiate and subsidize the professional practice of these students in a concrete and effective way. In conclusion, the extension project represents an excellent tool in the teaching-learning process for students.