Penn Library\u27s Library\u27s LJS 487 - [Treatises on astronomical instruments].(Video Orientation)

https://repository.upenn.edu/sims_video/1225/thumbnail.jp

Collation Model for Ms. Codex 1020: Lectiones ex[i]mi philosophi...

Lectures on the first, second, and fifth books of Aristotle\u27s Physics.https://repository.upenn.edu/sims_models/1161/thumbnail.jp

Penn Library\u27s LJS 465 - [Didactic poem on surveying and measurement of areas]. (Video Orientation)

https://repository.upenn.edu/sims_video/1203/thumbnail.jp

Penn Library\u27s LJS 473 - [De navigatione]. (Video Orientation)

https://repository.upenn.edu/sims_video/1212/thumbnail.jp

Technical Report on: Anchoring Sagittal Plane Templates in a Spatial Quadruped

This technical report provides a more thorough treatment of the proofs and derivations in the authors\u27 paper Anchoring Sagittal Plane Templates in a Spatial Quadruped. The description of the anchoring controller is reproduced here without abridgement, and additional appendices provide a clearer account of the implementation details

Anchoring Sagittal Plane Templates in a Spatial Quadruped

This paper introduces a new controller that stabilizes the motion of a spatial quadruped around sagittal-plane templates. It enables highly dynamic gaits and transitional maneuvers formed from parallel and sequential compositions of such planar templates in settings that require significant out-of-plane reactivity. The controller admits formal guarantees of stability with some modest assumptions. Experimental results validate the reliable execution of those planar template-based maneuvers, even in the face of large lateral, yaw, and roll incurring disturbances. This spatial anchor, fixed in parallel composition with a variety of different parallel and sequential compositions of sagittal plane templates, illustrates the robust portability of provably interoperable modular control components across a variety of hardware platforms and behaviors. For more information: Kod*la

To Whom Does Philadelphia Belong? Exploring and Defining Institutional Investment in Single Family Rentals in Philadelphia

Since the global financial crisis of 2007-2009, single-family rentals have dramatically risen to prominence as a uniquely profitable asset class for institutional investors, especially in the United States. Made possible by a combination of three primary factors – the post-crisis inexpensive Real Estate Owned (REO) homes surplus, the decline in working-class wealth and ability to purchase homes, and the emergence of new property management technology – institutional investors are, for the first time, rapidly acquiring hundreds of thousands of single-family homes. The resulting single-family rental portfolios have also inspired novel investment profiteering strategies, which researchers increasingly argue profit at the direct expense of tenants and prospective owner-occupants. However, at the heart of these arguments, there exist critical unanswered questions around how “institutional investment” is defined and understood. As a result, public interpretations of important research frequently misunderstand its gravity. Journalists and policymakers tend to mitigate researchers’ claims, either arguing that “all home buyers are investors” or reducing all institutional investment to a handful of prominent players. This thesis seeks to empower existing and forthcoming research by clarifying how and why institutional investment should be understood, distinctly, in the modern day. The thesis first traces the historical development of institutional investors, then explores new methods for analyzing under-studied, smaller-scale institutional investment strategies. Most existing research has focused heavily on specific, large-scale investors and the cities where they generally operate. Instead, this research pilots methods to examine under-studied investor behavior in Philadelphia, the largest US city that has thus far received almost no research attention. The thesis then forwards the argument that, without a developed understanding of institutional investment, Philadelphia forfeits power over to whom its homes belong and who profits from those homes

Anchoring Sagittal Plane Templates in a Spatial Quadruped

https://repository.upenn.edu/ese_images/1094/thumbnail.jp

Teacher Shortages and Turnover in Rural Schools in the US: An Organizational Analysis

The objective of this study is to provide an overall national portrait of elementary and secondary teacher shortages and teacher turnover in rural schools, comparing rural schools to suburban and urban schools. This study utilizes an organizational theoretical perspective focusing on the role of school organization and leadership in the causes of, and solutions to, teacher shortages and staffing problems. The study entailed secondary statistical analyses of the nationally representative Schools and Staffing Survey, its successor the National Teacher Principal Survey, and their supplement the Teacher Follow-Up Survey, conducted by the National Center for Education Statistics. The analyses document that, in contrast to urban and suburban schools, the student population and teaching force in rural schools has dramatically shrunk in recent decades, that despite this decrease in students, and demand for teachers, rural schools have faced serious difficulties filling their teaching positions, and that these teacher staffing problems are driven by high levels of pre-retirement teacher turnover. Moreover, the data document that teacher turnover varies greatly between different kinds of schools, is especially high in high-poverty rural schools, and is closely tied to the organizational characteristics and working conditions of rural schools. Research and reform on teacher shortages and turnover has focused on urban environments because of an assumption that schools in those settings suffer from the most serious staffing problems. This study shows that teacher shortages and teacher turnover in rural schools, while relatively neglected, have been as significant a problem as in other schools

Collation Model for LJS 16: [Speculum historiale, Books 25-28].

A volume, probably the third from a set of three, comprising Books 25 to 28 of the Speculum historiale of Vincent of Beauvais. The volume is incomplete, breaking off at the beginning of Chapter 80 of Book 28, although the table of contents for Book 28 lists 102 chapters (f. 148r-148v) and the Speculum historiale when complete runs to 32 books.https://repository.upenn.edu/sims_models/1155/thumbnail.jp