Vortex formation and instability in the left ventricle

We study the formation of the mitral vortex ring during early diastolic filling in a patient-specific left ventricle (LV) using direct numerical simulation. The geometry of the left ventricle is reconstructed from Magnetic Resonance Imaging (MRI) data of a healthy human subject. The left ventricular kinematics is modeled via a cell-based activation methodology, which is inspired by cardiac electro-physiology and yields physiologic LV wall motion. In the fluid dynamics videos, we describe in detail the three-dimensional structure of the mitral vortex ring, which is formed during early diastolic filling. The ring starts to deform as it propagates toward the apex of the heart and becomes inclined. The trailing secondary vortex tubes are formed as the result of interaction between the vortex ring and the LV wall. These vortex tubes wrap around the circumference and begin to interact with and destabilize the mitral vortex ring. At the end of diastole, the vortex ring impinges on the LV wall and the large-scale intraventricular flow rotates in clockwise direction. We show for the first time that the mitral vortex ring evolution is dominated by a number of vortex-vortex and vortex-wall interactions, including lateral straining and deformation of vortex ring, the interaction of two vortex tubes with unequal strengths, helicity polarization of vortex tubes and twisting instabilities of the vortex cores

My phenomenology waits : Death and Rebirth in Joanne Kyger\u27s Phenomenological

Joanne Kyger\u27s literary career is soon to come full-circle, with the imminent re-publication of the legendary Japan & India Journals, which predates her first published collection of poems. When this happens, there is likely to be a reinvestigation of her travel journal publications, and this essay is my vote for Phenomenological, published in 1989 by The Institute For Further Studies, as the most deserving of critical attention

The State of the Parties (Sixth Edition)

Every four years, The State of the Parties brings readers up to date on party action in election years and in between. With the dual themes of continuity and change characterizing the new edition, this essential party primer includes: three new chapters on party roles in the 2008 election, a section on the impact of party resources for the campaign, extensive coverage of party mobilization efforts via the Internet and local activity, and new chapters covering topics ranging from Republicans\u27 fall from grace to party governance under Nancy Pelosi to President Obama\u27s role in party politics.https://ideaexchange.uakron.edu/state_of_the_parties6/1000/thumbnail.jp

Russia Invades Ukraine a Second Time--Why It Matters to the U.S.

On February 24, 2022, Russia invaded Ukraine a second time in eight years. A sovereign Ukraine is necessary for overall European stability, which is in U.S. and NATO interests. The U.S. and NATO must do all they can, short of deploying troops to Ukraine, to help the Ukrainians fight back against Putin's raw aggression. Should Ukraine fall, Putin is unlikely to stop there. In many ways, the viability of the transatlantic community will be decided in Ukraine

Beyond Library Walls: Embedded Librarians in Academic Departments

Today\u27s academic library provides resources that users can access both physically in the library and virtually from academic offices. This increasing availability of online access means that information resources are no longer confined within library walls and librarians need to rethink how their constituents\u27 information needs are being met. Embedding librarians in academic departments and programs is one way to expand library services within this new information landscape. This article describes the background and process for embedding librarians and provides case studies from three librarians who successfully embedded themselves in academic departments

The State of the Parties (Seventh Edition)

Continuing a three-decade tradition, The State of the Parties 7th edition brings together leading experts to evaluate change and continuity in American electoral politics. Political parties in America have never been more contentious and divided than they are right now. Even splits within the parties themselves have the power to elevate relatively unknown candidates to power and topple established incumbents. With sections devoted to polarization and the electorate, polarization and political elites, tea party politics, super PACS, and partisan resources and partisan activities, the contributors survey the American political landscape. They pay special attention to polarization between and within the parties in the aftermath of the 2012 election, demographic changes to America\u27s political parties, the effects of new media and campaign finance laws on national and local electoral results, the Tea Party\u27s rise and, as always, the implications of all these factors on future policymaking and electoral prospects. The State of the Parties 7th edition offers an indispensable guide to American politics for scholars, students, and practitioners.https://ideaexchange.uakron.edu/state_of_the_parties7/1000/thumbnail.jp