19,942 research outputs found
Optimized stereoselective and scalable synthesis of five-membered cyclic trans-β-amino acid building blocks via reductive amination
No full textWe present an optimized method for the stereoselective synthesis of five-membered alicyclic and heterocyclic trans-β-amino acid derivatives. The process involves a reductive amination of β-keto esters using chiral auxiliary amines, with formic acid acting as a facilitator for rapid, diastereoselective reductions under gentle conditions. Our approach notably enhances isolated yields and permits the scalable production of trans-2-aminocyclopentanecarboxylic acid (trans-ACPC), 4-aminopyrrolidine-3-carboxylic acid (trans-APC), 4-aminotetrahydrofuran-3-carboxylic acid (trans-ATFC), and 4-aminotetrahydrothiophene-3-carboxylic acid (trans-ATTC) building blocks.
Heat transfer and capillary performance of dual-height superhydrophilic micropost wicks
No full textWe propose dual-height superhydrophilic (DHS) micropost evaporator wicks with improved heat transfer performance for thermal management applications such as micro heat pipes. The heat transfer coefficient and capillary performance are characterized with a numerical model that accounts for the finite curvatures of liquid menisci by varying solid fraction of micropost arrays from 0.18 to 0.54. The DHS wicks vertically stretch a thin (<2 mu m) evaporative film region with low thermal resistance, which enhances the heat transfer coefficient up to similar to 300% compared with the previously reported single-height superhydrophilic (SHS) micropost wicks with the same solid fraction. The stretch of thin film region does not significantly affect the capillary pressure and permeability determined from microscopic menisci. The optimum solid fraction maximizing the heat transfer coefficient occurs since the maximum height ratio between tall and short posts satisfying the pinning criteria decreases with increasing solid fraction, while the total perimeter of microposts increases. The vertical stretch of thin film also lowers the sensitivity of performance to liquid fill charge over 60%. This work suggests that DHS micropost wicks can provide significantly higher heat transfer coefficient in more robust way compared with previous SHS wicks without scarifying the maximum heat transfer performance. (C) 2014 Elsevier Ltd. All rights reserved.
Stereocontrolled Synthesis of the C1‐C10 Fragments of Monensin B and Laidlomycin
No full textAn efficient synthetic route to the C1-C10 fragments of laidlomycin and monensin B has been developed toward their total synthesis. The asymmetric carbons have been elaborated by a syn-aldol reaction using the oxazolidinone chiral auxiliary for C6 and C7, an anti-aldol reaction for C3 and C4, the Tishchenko-Evans reaction for C5, and a chiral building block for C2. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Supplemental Material, sj-pdf-1-ojs-10.1177_23259671221145228 - Reliability of the TT-TG Index Versus TT-TG Distance on MRI: Morphometric Analyses in Asian Children and Adolescents
No full textSupplemental Material, sj-pdf-1-ojs-10.1177_23259671221145228 for Reliability of the TT-TG Index Versus TT-TG Distance on MRI: Morphometric Analyses in Asian Children and Adolescents by Sin Hyung Park, Wonchul Choi, Siyeong Yoon, Jeongbae Rhie, Wooyeol Ahn, Jongbeom Oh, Dong Hun Han and Soonchul Lee in Orthopaedic Journal of Sports Medicine</p
Who Was Edmund Lee?
No full textLocal author Peggy Donoho discusses her pioneer ancestor, Edmund Lee, and her work to preserve their family cemetery
The Future of Canadian Climate Policy — with Marc Lee
No full textMarc Lee is a Senior Economist at the Canadian Centre for Policy Alternatives\u27 BC Office. In addition to tracking federal and provincial budgets and economic trends, Marc has published on a range of topics from poverty and inequality to globalization and international trade to public services and regulation. Marc is the Co-Director of the Climate Justice Project, a research partnership with UBC\u27s School of Community and Regional Planning that examines the links between climate change policies and social justice.Resources:Climate Justice Project: www.policyalternatives.ca/projects/cli…tice-projectMarc Lee\u27s Posts on Policy Note: www.policynote.ca/author/marclee/Canadian Centre for Policy Alternatives: www.policyalternatives.ca/Marc\u27s Twitter: twitter.com/MarcLeeCCPA International Panel on Climate Change, 2021 report: www.ipcc.ch/report/ar6/wg1
Dr. Aleksandra Sznajder Lee – Faculty Author Interview
No full textDr. Aleksandra Sznajder Lee, Associate Professor of Political Science, discusses her new book, Transnational Capitalism in East Central Europe’s Heavy Industry, published recently by the University of Michigan Press. Focusing on the steel industry during the post-communist transition from 1989 through 2009, Dr. Sznajder Lee traces the transformation of flagship state enterprises in the Czech Republic, Poland, Romania, and Slovakia into the subsidiaries of large, international corporations
Letter from K.W. Lee to Friends of Michi Weglyn, November 1, 1997
No full textA letter from K. W. (Kyung Won) Lee, an investigative journalist who wrote for the Sacramento Union, to the Friends of Michi Weglyn. Lee wrote that Weglyn was instrumental in the campaign to free Chol Soo Lee, a Korean American man was on death row, but later had his convictions overturned. Lee also wrote that other Japanese American activists were instrumental to the success of this campaign.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
Francis Lee Utley (interview)
No full textThis interview is included in the American Folklore Society Oral History Project held at the Archive of Folk Culture, American Folklife Center, Library of Congress, Washington, D.C. This item consists of oral history interviews with folklorist Francis Lee Utley conducted in 1973 by Patrick B. Mullen and Richard Reuss for the American Folklore Society Oral History Project. This collection consists of 2 sound tape reels : analog, 3 3/4 ips, 2 track, mono. ; 7 in. Originally recorded on July 19, 1973 by Patrick B. Mullen on a 7-inch reel, 3 3/4 ips, 2 track at an unidentified location; and on November 3, 1973 by Patrick B. Mullen and by Richard Reuss at the annual meeting of the American Folklore Society in Nashville, Tennessee on a Sony audiocassette. Sound recordings are first generation copies on two sound tape reels, 7 in. Biography/History note: Francis Lee Utley was born May 25, 1907 in Watertown, Wisconsin, and died March 8, 1974. He was a folklorist, medievalist, linguist, educator, and author who earned his M.A. in 1934 and Ph.D. in 1936 in literature at Harvard University. He taught at Ohio State University and the University of California at Berkeley, and was president of the American Folklore Society from 1951-1952
- …
