Internal Rotation Of The Acetyl Methyl Group In Methyl Alkyl Ketones: The Microwave Spectrum Of Octan-2-one

Methyl \textit{n}-alkyl ketones form a class of molecules with interesting internal dynamics in the gas-phase. They contain two methyl groups undergoing internal rotations. To explore the link between structure and barrier heights in ketones, investigations on a series of saturated methyl \textit{n}-alkyl ketones were performed, i.e. pentan-2-one\footnote{M. Andresen, I. Kleiner, M. Schwell, W. Stahl, H. V. L. Nguyen, J. Phys. Chem. A 2018, 122, 7071-7078} hexan-2-one\footnote{M. Andresen, I. Kleiner, M. Schwell, W. Stahl, H. V. L. Nguyen, ChemPhysChem 2019, 20, 2063-2073}, heptan-2-one\footnote{M. Andresen, I. Kleiner, M. Schwell, W. Stahl, H. V. L. Nguyen, J. Phys. Chem. A 2020, 124, 1353-1361.} and octan-2-one\footnote{M. Andresen, D. Schöngen, I. Kleiner, M. Schwell, W. Stahl, H. V. L. Nguyen, ChemPhysChem 2020, 21, 2206-2216}. The molecular jet Fourier-transform microwave spectrum of octan-2-one was recorded between 2.0 and 40.0 GHz, revealing two conformers, one with C$_{1}$ and one with C$_{s}$ symmetry. The barriers to internal rotation of the acetyl methyl group were determined to be 233.340(28) cm$^{-1}$ and 185.3490(81) cm$^{-1}$, respectively, confirming the link between conformation and barrier height already established for other methyl alkyl ketones. The study combined high level \textit{ab initio} calculations with experimentally dervived rotational and torsional parameters using the XIAM\footnote{H. Hartwig, H. Dreizler, Z. Naturforsch. 1996, 51a, 923-932} and BELGI-C$_{1}$ (or BELGI-C$_{s}$)\footnote{I. Kleiner, J. T. Hougen, J. Chem. Phys. 2003, 119, 5505-5509.} codes. Results from the various fits will be presented. Finally comparisons to molecules in the literature and structural aspects of the conformers generally observed in methyl \textit{n}-alkyl ketones will be reviewed

The Nuclear (and the) Holocaust: Israel, Iran, and the Shadows of Auschwitz

International audience(CE, S., 9 avr. 1999, Sté Interbrew, Req. n° 191654, concl. J.-H. Stahl, RFDA 1999. 769 ; CE, S., 9 avr. 1999, Sté The Coca-Cola Company, Req. n° 201853, concl. J.-H. Stahl, RFDA 1999. 777, AJDA 1999. 611, note M. Bazex et B. Thiry

MRL1: German Missionaries in Cameroon Reports, 1914-1915

Copies of thirteen (13) typewritten reports from Swiss and German Basel Missionaries. Captured by British and French troops while stationed in Cameroon in September and October 1914; held captive until 1915 during World War I. Reports were given and recorded in 1915 in Basel, Switzerland and Berlin and Connstadt, Germany. The thirteen missionaries are Friedrich Bärtschi; J. Bührer; Chr. Gehr.; J. Gutbrod; Philipp Hecklinger; Johannes Ittmann; Johannes Köngeter; Johannes Leiberspeiger; G. Lorch.; Johannes Georg Meier; Robert Schwarz; H. Stahl; and Karl Wittwer. Records are in German

Two Measures on Cantor Sets

We give an example of Cantor type set for which its equilibrium measure and the corresponding Hausdorff measure are mutually absolutely continuous. Also we show that these two measures are regular in Stahl-Totik sense

Modern Philosophies and School Voucher Programs

In February 2017, for the first time since the presidency of George H. W. Bush, the Vice President had to cast a tie-breaking vote in the Senate (Reilly, 2017). The issue that caused such division in the Senate was the confirmation of Secretary of Education Betsy DeVos. Voted as the least liked member of Trump’s cabinet, Secretary DeVos continues to generate controversy (Reilly, 2017). From the time that President Trump announced his nomination of Betsy DeVos, DeVos’s educational beliefs have created controversies. One of her controversial stances is that school choice should be increased through voucher programs. Voucher programs allow parents to send their students to private schools using government money. Often, vouchers are only offered to families from low incomes. DeVos claims that the test scores of the United States have continued to be average compared to other countries. To fix this, parents must have the ability to choose a school that serves their children most effectively. However, some parents cannot choose because of socioeconomic status and need a voucher to have that choice (Stahl, 2018). However, others point out that schools are not improving, especially in Michigan, where DeVos’s ideas have begun to take root (Stahl, 2018). In short, DeVos argues that vouchers will increase students’ performance in comparison with other countries; others say that vouchers are not working in Michigan. These are arguments about practical results. However, the underlying arguments for and against vouchers are not about the pros and cons but the purpose of education. If educators continue to argue about statistics and theories without examining the underlying philosophies, they will continue to argue past each other. Arguments for and against vouchers are rooted in the purpose of school defined by three different philosophies: neoliberalism, communitarianism, and liberalism

Alopecia, ascites, and incomplete regeneration after 85 to 90 per cent liver resection

A nineteen year old female underwent 85 to 90 per cent partial hepatectomy to treat a minimal deviation hepatoma. Observations afterwards suggested that the limit of resection compatible with survival had been reached. She recovered perfect health after many months, although liver regeneration was not complete. Severe but eventually reversible alopecia and ascites developed postoperatively, undoubtedly as a complication of the massive hepatic resection. © 1975

Jazz Fest 1989

Guest artists: Steve Houghton (drums), Dave Stahl (trumpet)https://digitalcommons.morris.umn.edu/jazzfest/1010/thumbnail.jp