5,405 research outputs found
Very accurate cryogenic mechanisms for CRIRES+
Get PDFAfter 5 years of operation on the VLT, a large upgrade of CRIRES (the ESO Cryogenic InfraRed Echelle Spectrograph) was decided mainly in order to increase the efficiency. Using a cross dispersion design allows better wavelength coverage per exposure. This means a complete re-design of the cryogenic pre-optic which were including a predispersion stage with a large prism as dispersive element. The new design requires a move of the entrance slit and associated decker toward the first intermediate focal plane right behind the window. Implement 2 functions with high positioning accuracy in a pre-defined and limited space was a real challenge. The design and the test results recorded in the ESO Cryogenic Test Facility are reported in this paper. The second critical function is the grating wheel which positions the 6 cross disperser gratings into the beam. The paper describes the design of the mechanism which includes a detente system in order to guaranty the 5 arc sec positioning reproducibility requested. The design includes also feedback system, based on switches, in order to ensure that the right grating is in position before starting a long exposure. The paper reports on the tests carried out at cryogenic temperature at the sub-system level. It also includes early performances recorded in the instrument along the first phases of the system test
Poet and author Jack Ridl reads his selected works at the Michigan Writers Series
No full textPoet and author Jack Ridl reads his selected poems. The event is convened by Peter Berg, head of Michigan State University Libraries' Special Collections. Part of the MSU Libraries' Michigan Writers Series. Held at the Main Library
Author and bioregionalist Stephanie Mills reads her selected works at the Michigan Writers Series
No full textAuthor and ecologist Stephanie Mills reads from her first book "Whatever happened to ecology?" and from "Tough little beauties," then answers questions from the audience. The event is convened by Peter Berg, head of Michigan State University Libraries' Special Collections. Part of the Michigan State University Libraries' Michigan Writers Series. Held in the Main Library
Author Jeff Vande Zande reads his selected works at the Michigan Writers Series
No full textAuthor Jeff Vande Zande reads selections from both his poetry and fiction, including "Transient" and "Threatened species", and answers questions from the audience. The event is convened by Peter Berg, head of Michigan State University Libraries' Special Collections. Part of the MSU Libraries' Michigan Writers Series. Held in the MSU Main Library
Short story author Sylvia Watanabe reads her selected works at the Michigan Writers Series
No full textShort story author Sylvia Watanabe reads from her memoir "Knowing Your Place" then answers questions from audience. The event is convened by Director of Special Collections Peter Berg. Part of the Michigan State University Libraries' Michigan Writers Series. Held in the Main Library
Michigan author Liesel Litzenburger reads from her novel in progress at the Michigna Writers Series
No full textMichigan author Liesel Litzenburger reads from her novel in progress which is set in Morthern Michigan like her collection of short stories entitled "Now you love me," published in 2001. The event is convened by Peter Berg, head of the Michigan State University Libraries' Special Collections. Part of the MSU Libraries' Michigan Writers Series. Held in the MSU Main Library
Author Gary Gildner reads his selected works at the Michigan Writers Series
No full textAuthor Gary Gildner reads "Sleepy time gal," "Pavol Hudak, the poet, is talking," and "Genealogy" then answers questions from the audience. The event is convened by Peter Berg, head of the Michigan State University Libraries' Special Collections. Part of the MSU Libraries' Michigan Writers Series. Held at the MSU Main Library
Author Paul Clemens reads from his book "Made in Detroit" at the Michigan Writers Series
No full textAuthor Paul Clemens reads from his book "Made in Detroit" and answers questions from the audience. The event is convened by Peter Berg, head of the Michigan State University Libraries' Special Collections. Part of the MSU Libraries' Michigan Writers Series. Held in the MSU Main Library
The TOLIMAN space telescope
Get PDFThe TOLIMAN space telescope is a low-cost, agile mission concept dedicated to astrometric detection of exoplanets in the near-solar environment, and particularly targeting the Alpha Cen system. Although successful discovery technologies are now populating exoplanetary catalogs into the thousands, contemporary astronomy is still poorly equipped to answer the basic question of whether there are any rocky planets orbiting any particular star system. Toliman will make a first study of stars within 10 PC of the sun by deploying an innovative optical and signal encoding architecture that leverages the most promising technology to deliver data on this critical stellar sample: high precision astrometric monitoring. Here we present results from the Foundational Mission Study, jointly funded by the Breakthrough Prize Foundation and the University of Sydney which has translated innovative underlying design principles into error budgets and potential spacecraft systems designs
Peter Berg interviews prose and poetry writer Kathleen McGookey
No full textAuthor Kathleen McGookey talks about developing her motivation to write during college and getting published for the first time. She also talks about the work required to assemble a number of pieces for publication, her relationship with editor Robert Alexander, balancing writing with being a parent, working on a children's book, the difference between simple prose and a prose poem, and the subtle influence of Michigan on her writing. She is interviewed by Michigan State University Librarian Peter Berg for the Michigan State University Libraries' Michigan Writers Series
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