Penumbra Theatre Company was founded in 1976 by Lou Bellamy as a venue for African American voices within the Twin Cities theatre scene and has stood for more than thirty-five years at the intersection of art, culture, politics, and local community engagement. It has helped launch the careers of many internationally respected theatre artists and has been repeatedly recognized for its artistic excellence as the nation’s foremost African American theatre. Penumbra is the first-ever history of this barrier-breaking institution. Based on extensive interviews with actors, directors, playwrights, producers, funders, and critics, Macelle Mahala’s book offers a multifaceted view of the theatre and its evolution. Penumbra follows the company’s emergence from the influential Black Arts and settlement house movements; the pivotal role Penumbra played in the development of August Wilson’s career and, in turn, how Wilson became an avid supporter and advocate throughout his life; the annual production of Black Nativity as a community-building performance; and the difficult economics of African American theatre production and how Penumbra has faced these challenges for nearly four decades. Penumbra is a testament to how a theatre can respond to and thrive within changing political and cultural realities while contributing on a national scale to the African American presence on the American stage. It is a celebration of theatre as a means of social and cultural involvement—both local and national—and ultimately, of Penumbra’s continuing legacy of theatre that is vibrant, diverse, and vital.

The Ischemic Penumbra presents the current status of concepts and research on this topic and identifies the latest methods for clinicians to quickly and efficiently recognize viable cerebral tissue for enhanced stroke management. Focusing on state-of-the-science technologies and current trends, the book examines imaging strategies utilizing PET, SP

The utterly charming prequel to the New York Times-bestseller Mr Penumbra's 24-hour Bookstore. San Francisco, 1969. The summer of drugs, music and a new age dawning. A young, earnest Ajax Penumbra has been given his first assignment as a Junior Acquisitions Officer - to find the single surviving copy of the Techne Tycheon, a mysterious volume that has brought and lost great fortune for anyone who has owned it. After a few weeks of rigorous hunting, Penumbra feels no closer to his goal than when he started. But late one night, after another day of dispiriting dead ends, he stumbles upon a 24-hour bookstore and the possibilities before him expand exponentially. With the help of his friend's homemade computer, an ancient map, a sunken ship and the vast shelves of the 24-hour bookstore, Ajax Penumbra might just find what he's seeking...

An inspiring story that helps readers to confront the more challenging truths of existence with confidence by offering hope and solutions in these desperate times Written for spiritual seekers interested in stories that satisfy the soul while stretching the mind The themes, plotlines, characters, and motifs are all based on the works of William Shakespeare in some way and enhance one's understanding of the playwright

Guest-edited by Agostino De Rosa, Alessio Bortot and Francesco Bergamo Penumbra, from the Latin paene (almost) and umbra (shadow), can be defined as an intermediate zone of transition between light and shadow. Penumbra is therefore that space, both physical and imaginary, where everything is possible: it is the place of the uncanny, where presence and/or absence can produce wonder or horror. This AD positions the presence of this archetype in the contemporary world of architecture, investigating the ways it permeates different expressive forms – from critical theory to architectural drawing, from design and planning to photography. The contributors illustrate and discuss how penumbra has shaped their creativity and modified their approach to the design process. As a physical phenomenon, penumbra has supra-historical and global connotations; nonetheless, different cultures elaborate its symbolism in different ways. Its wide semantic spectrum powerfully inspires creative forms that hover between fullness and emptiness, presence and absence, past and future. The critical perspectives in this issue offer a wide analysis of penumbra’s expressive potential and the key to an in-depth understanding of this elusive layer of reality. Contributors: Matthias Bärmann, Silvia Benedito, Filippo Bricolo, Edwin Carels, Javier Corvalán, Dris Kettani, Stephen Kite, Giancarlo Mazzanti, Akira Mizuta Lippit, Susanna Pisciella, Renato Rizzi, Paul O Robinson, and Antonella Soldaini. Featured architects and artists: Alexander Savvich Brodsky, Neri&Hu studio, Quay Brothers, Ursula Schulz-Dornburg, and Marco Tirelli.

A method for calculating orbital shadow terminator points is presented. The current method employs the use of an iterative process which is used for an accurate determination of shadow points. This calculation methodology is required, since orbital perturbation effects can introduce large errors when a spacecraft orbits a planet in a high altitude and/or highly elliptical orbit. To compensate for the required iteration methodology, all reference frame change definitions and calculations are performed with quaternions. Quaternion algebra significantly reduces the computational time required for the accurate determination of shadow terminator points.

Agent Sam Ryan is sick of feeling lonely. It's time to take control and get a life outside of work. But Stephan, her boss, won't let her go easily. Offered the choice between guarding a clone, or remaining stuck in her office, Sam reluctantly accepts the former, even though she suspects Stephan is using her as bait to draw out the dangerous Sethanon. Gabriel is relieved to discover he's finally shaken Sam as his partner, until he learns her new assignment is guarding Wetherton. He and Stephan know Wetherton could only have come from Hopeworth, the base involved in DNA experiments for decades, where it is more than likely that Sam was created. But there is a growing likelihood that the military base is also the home of Sethanon himself. Gabriel is determined to protect her, yet all too soon he discovers the connection between he and Sam is far deeper than anyone could ever have imagined.

A New York Times bestseller, Mr Penumbra's 24-hour Bookstore is an entirely charming and lovable first novel of mysterious books and dusty bookshops; it is a witty and delightful love-letter to both the old book world and the new. Recession has shuffled Clay Jannon out of his life as a San Francisco Web-design drone - and serendipity, coupled with sheer curiosity, has landed him a new job working the night shift at Mr. Penumbra's 24-Hour Bookstore. But after just a few days, Clay begins to realize that this store is even more curious than the name suggests. There are only a few customers, but they come in repeatedly and never seem to actually buy anything, instead they simply borrow impossibly obscure volumes from strange corners of the store, all according to some elaborate, long-standing arrangement with the gnomic Mr. Penumbra. The store must be a front for something larger, Clay concludes, and soon he's embarked on a complex analysis of the customers' behaviour and roped his friends into helping to figure out just what's going on. But once they bring their findings to Mr. Penumbra, it turns out the secrets extend far outside the walls of the bookstore... 'The pages swell with Mr Sloan's nerdy affection and youthful enthusiasm for both tangible books and new media... [but] the ties that bind the story are friendship and vitality for life. This is a clever and whimsical tale with a big heart' The Economist Shortlisted for the LA Times Book Award for First Fiction.

The ischemic penumbra was initially defined by Symon, Lassen and colleagues in the 1970s as an area of brain tissue with inadequate blood flow to maintain electric activity of neurons but adequate blood flow to preserve the function of the ion channels. This area of tissue, receiving enough blood to survive but not enough to function, often surrounds or abuts the irreversibly damaged core in ischemic stroke. It was shown that if blood flow could be restored to this area of marginal perfusion, the tissue could survive and function again, and growth of the core could be prevented. Based on seminal PET studies, penumbra or "penumbral tissue" eventually took on a subtly different meaning - the area of brain that is destined to progress to infarct unless blood flow is restored within a particular time window. The penumbra thus became the target for all acute stroke interventions - to preserve viability of the tissue and restore function. New imaging techniques, including diffusion and perfusion MRI and CT perfusion, were developed to rapidly identify individuals with penumbra, who were thought to be the best candidates for aggressive interventions to restore blood flow, particularly beyond the licensed time-window for IV thrombolysis. However, most clinical trials have failed to establish the usefulness of identifying candidates for treatment in this way using pre-specified protocols and primary endpoints. These trials have used different and sometimes unvalidated thresholds of hypoperfusion as well as irreversible infarct and various definitions of significant penumbra (or mismatch between irreversible infarct and hypoperfused, but salvageable tissue), and reanalysis of their data using more refined image processing showed post-hoc positivity. They have also evaluated outcome in a variety of ways, with few studies measuring the direct effect of restoring blood flow on the function of the penumbral tissue. Therefore, important remaining questions include how to define, characterize, and image the penumbra in acute stroke to achieve the greatest reliability and validity for what we want to measure, and whether this concept, so defined, provides an optimal target for stroke therapy using state-of-the-art trial design.

Penumbra is the official, refereed, scholarly journal of Union Institute & University's Ph.D. Program in Interdisciplinary Studies. The journal is published at regular intervals and dedicated to challenging traditional academic and creative disciplinary boundaries in the context of social change. Penumbra's purpose is to promote theoretically informed engagements with concrete issues and problems. The journal publishes socially engaged, innovative, creative and critical scholarship with a focus on ethical and political issues in the humanities, public policy, and education and leadership. Penumbra is a peer-edited and peer-reviewed journal committed to spanning the divide between scholarly and creative production, and to fostering work from graduate students, junior scholars and emerging artists, in addition to more established critical and creative voices.