partial vacuum
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2021 ◽  
Vol 16 (4) ◽  
Author(s):  
Kate Walker

There were mistakes in two citations. The original article can be found via the DOI: https://doi.org/10.5195/jyd.2021.1059. The year and title were corrected for Farella, J., Hauser, M., Parrott, A., Moore, J. D., Penrod, M., & Elliott-Engel, J. (2021). 4-H Youth development programming in Indigenous communities: A critical review of cooperative extension literature. Journal of Extension, 59(3), Article 7. https://doi.org/10.34068/joe.59.03.07. The year was corrected for: Farella, J., Moore, J., & Arias, J. (2021). Applying the Peoplehood Model: A model for assessing Indigenous identity inclusion in extension programming (AZ1909-2020). University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1909-2021.pdf


2021 ◽  
Vol 16 (4) ◽  
pp. 1-25
Author(s):  
Joshua Farella ◽  
Joshua Moore ◽  
Juan Arias ◽  
Jeremy Elliott-Engel

Indigenous youth are systemically underserved by 4-H and other positive youth development (PYD) organizations. Many underserved First Nation communities in the United States could greatly benefit from programs that foster youth thriving; however, these programs tend to be ineffective in creating culturally reflective spaces for Indigenous participants. In this article, we argue that the Peoplehood Model should serve as a unifying model for the inclusion of Indigenous identity in programming, and that cultural humility should be firmly integrated into program design and assessment. We also propose that, to support Indigenous youth thriving, PYD practitioners must intentionally create a “partial vacuum” that supports youth creating program context and thriving.


Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4356
Author(s):  
Dominik Rodak ◽  
Robert Zalewski

In this paper a new concept of a controllable granular damper is presented. The introduced prototype works based on so-called vacuum packed particles (VPPs). Such structures are made of granular materials located in a soft and hermetic encapsulation. As a result of generating a partial vacuum inside the system, the structure starts to behave like a nonclassical solid body. The global physical (mechanical) features of VPPs depend on the level of internal underpressure. The introduced prototype of a controllable torsional damper exhibits various dissipative properties as a function of internal underpressure. The design details of the investigated device are presented. Basic laboratory tests results are discussed. To describe the hysteretic behavior of the device, the Bouc–Wen rheological model has been modified and adopted. Nonlinear functions of underpressure have been introduced to the initial model formulation. The developed Bouc–Wen model has been applied to capture the real response of the VPP torsional damper prototype.


2020 ◽  
pp. 1-8
Author(s):  
Ankur Kumar Gupta ◽  
Yogesh K. Chauhan ◽  
Tanmoy Maity ◽  
Ria Nanda

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