345 research outputs found
Gerda L. Schulman Collection 1938-1993
No full textThis collection consists of two folders: one containing Gerda Schulman's Austrian Heritage Collection questionnaire with biographical details of her experience in Vienna before the Anschluss and subsequent immigration, as well as degrees and professional certificates. The second folder contains publications by Gerda Schulman from her professional career as a psychologist. The second folder also includes a letter from 1938, originally published in the book "Thomas Mann Letters".digitizedGerda Schulman (née Lang) was born 1915 in Vienna, Austria. She finished her law studies at the University of Vienna just a few weeks before the Anschluss in March of 1938. She and her Dutch husband, Hans fled to Amsterdam, and they immigrated to the U.S. in 1939 where she started her studies in psychology. She eventually became a family therapist and a published author of scientific works.Itemized list of collection in folder 1Austrian Heritage CollectionProcessed for digitizatio
La2Pd3Ge5 and Nd2Pd3Ge5 Compounds: Chemical Bonding and Physical Properties
No full textThe two La2Pd3Ge5 and Nd2Pd3Ge5 compounds, crystallizing in the oI40-U2Co3Ge5 crystal structure, were targeted for analysis of their chemical bonding and physical properties. The compounds of interest were obtained by arc melting and characterized by differential thermal analysis, scanning electron microscopy, and X-ray diffraction both on powder and on a single crystal (for the La analogue), to ensure the high quality of the samples and accurate crystallographic data. Chemical bonding was studied by analyzing the electronic structure and effective QTAIM charges of La2Pd3Ge5. A significant charge transfer mainly occurs from La to Pd so that Ge species assume tiny negative charges. This result, together with the -(I)COHP analysis, suggests that, in addition to the expected homopolar Ge bonds within zigzag chains, heteropolar interactions between Ge and the surrounding La and Pd occur with multicenter character. Covalent La-Pd interactions increase the complexity of chemical bonding, which could not be adequately described by the simplified, formally obeyed, Zintl-Klemm scheme. Electric resistivity, specific heat, magnetization, and magnetic susceptibility as a function of temperature indicate for both compounds a metallic-like behavior. For Nd2Pd3Ge5, two low-temperature phase transitions are detected, leading to an antiferromagnetic ground state
Gerda Lerner Family Collection 1939-1978
No full textThe collection contains materials related to several members of the Kronstein/Neumann/Mueller families; both original documents as well as additional biographical information and excerpts from Gerda Lerner's book "A Death of One's Own". The bulk consists of correspondence, mainly written from Ilona Kronstein's exile in Nice to her daughter Gerda in the United States. In one letter, Ilona Kronstein describes a brief stay in the Gurs camp. Most of the correspondence has been summarized by John and Eva Englander, the summaries are included in the folders.Austrian Heritage CollectionGerda Lerner, October 2003; April 2004 (Addenda 1)The Gerda Lerner Papers are on deposit at the Schlesinger Library, Radcliffe Institute. See also the Nora Kronstein-Rosen Family Collection at the LBI (AR 25257)Ilona Kronstein (nee Neumann) was born in Budapest in 1897 to Sigmund Neumann and Emma Deutsch. In 1918, she met Robert Kronstein. The couple married a year later and moved to Vienna. They had two daughters: Gerda, born in 1920, and Nora, born in 1925. Between 1928 and 1933 Ilona studied art with Johannes Itten. She opened her own studio in 1933. In 1938, after several weeks in a Gestapo prison, she fled with her two daughters, Gerda and Nora, to Liechtenstein, where her husband was already waiting. After a few months in Vaduz, she went to a small town near Nice and solely devoted herself to art. It was in Nice that she became friends with the painter Rudolf Ray. In 1940 she was detained in the concentration camp at Gurs for several weeks and from 1941 onwards she began to show signs of multiple sclerosis. Her family managed with great difficulty to get her back to Liechtenstein in 1942 and to obtain medical assistance for her in Switzerland. She died in Zurich in 1948.In 2000, the Jewish Museum Vienna exhibited drawings and pastels by Ilona Kronstein, which her daughters Gerda Lerner and Nora Kronstein-Rosen donated to the museum in 1997.Ilona's sister Margit Neuer (born 1899) was a physician and perished in Auschwitz. Her second sister Klara (born 1903) married Alexander Mueller, a psychiatrist and close co-worker of Alfred Adler. As a stateless person he was denied residence in several countries and forcibly sent across the border back to Germany, until he finally obtained residence in Holland. After the Nazi takeover of the Netherlands, he and his wife fled to Budapest, where they survived the Russian siege and he survived Eichmann's death march to Austria. After the end of the war they first returned to The Netherlands, then found refuge in Switzerland, where Alexander Mueller accepted a position at the University of Zuerich. He died in 1968.Elizabeth Breznitz, née Klein, was born in Léva (then Hungary, today Levice, Slovakia). Her first husband, Leo Kalmer, died in a concentration camp in Bavaria; she was liberated from Auschwitz in 1945, but her father and her stepmother perished. After the war she lived in Plzen, Czech Republic. Her letters are of great interest to understand the daily life of a Holocaust survivor in Czechoslovakia.Gerda Kronstein came to the US in 1939, where she married Carl Lerner in 1941. She received her Ph.D. at Columbia University in 1966. She is one of the founders of women's history and a former President of the Organization of American Historians. In 1972, she founded the first graduate (M.A.) program in women's history in the US at Sarah Lawrence College. In 1980 she founded the first PH.D. program in women's history at the University of Wisconsin-Madison. She has won many honors, including 17 honorary degrees and is the author of 13 books.See also the catalog of an exhibition held at the Juedisches Museum Wien in 2000: Die Welt der Ili Kronstein = the world of Ili Kronstein : Werke 1938-1943 / herausgegeben von Werner Hanak im Auftrag des Juedischen Museums Wien. Wien : Juedisches Museum Wien, 2000. (LBI Library call number: q 156)Alexander Mueller’s only published book, “Du sollst ein Segen sein! : Grundzuege eines religioesen Humanismus“, GBS-Verlag, 1954 („You shall be a blessing! : main traits of a religious humanism”) has been transferred to the LBI libraryGerda Lernerdigitize
DFT simulation of the physical properties of the newly discovered Ti₃Co₅B₂ -type novel borides Mn₃₋ₓ {Rh,Ir}₅B₂ using HPC in addition to X-ray single crystal and TEM data evaluation
No full textBoron has unique chemical properties and with it´s ability of reactions with metals boron yields to a large class of metal borides with high melting points and super hardness [1,2]. Some metal borides are superconductors and there are many borides with extraordinary magnetic properties [3].
While investigating the phase relations in the Mn-{Rh,Ir }-B system we have discovered for both systems a ternary compound, Mn(3−x){Rh,Ir}5B2. The crystal structure of both compounds were determined from X-ray single crystal data to be isotypic with the Ti3Co5B2-type (space group P4/mbm, No. 127). Remarkably, both cases exhibit a significant defect at the Mn 2a sites, which is at the origin of the unit cell.
The absence of a superstructure related to these defects is confirmed by transmission electron microscopy studies, in fact Mn atoms and their corresponding vacancies randomly share the 2a sites in a small unit cell.
The aim of this presentation is to show that we can model this randomly occurring vacancies of Mn atoms in the above mentioned crystallographic positions with large supercell simulations. We initially perform a
full relaxation of the lattice parameters and ionic positions for the unit cell with no vacancies followed by supercell calculations with cells as large as 2 × 2 × 3, which results in a 240 atoms structure. The effect of the Mn vacancies is then simulated by running calculations with some Mn atoms removed from the 2a site (out of 24).
To run simulations on such big supercells we needed the aid of high-performance computing (HPC) and, therefore, did our calculations on the Vienna Scientific Cluster (VSC). We have run several tests with the
Vienna ab-initio simulation package VASP, which we have used for our density functional theory (DFT) approach to find out the optimal adjustments for the parallelism settings. The results of this investigation will be presented here.
References
[1] Steiner, S., Rogl, G., Flansdorfer, H., Noel, H., Gonçalves, A.P., Giester, G., and Rogl, P.F., J. Alloy.
Comp. 811, 151578 (2019).
[2] Steiner, S., Rogl, G., Michor, H., Giester, G., Rogl, P.F., and Gonçalves, A.P., Dalton Trans. 47, 12933
(2018).
[3] Ali, T., Steiner, S., Ritter, C., and Michor, H., J. Alloy. Comp. 716, 251 (2017)
Names Calling / Prague Winter / Flight to England.
No full textThe memoirs were written in 1998. History of the Stein and Eisenberger family. The author’s mother Erna was the daughter of the well-respected solicitor Dr. Wilhelm Eisenberger. She got married to a Gentile, with whom she had a daughter, the author’s older sister Anna. After their divorce she got married to Arnold Stein, father of the author. Brief recollections of the author’s childhood. Jump to life in Karlsbad under the Nazi rule in 1938. Move to Prague. Fervent preparations in order to be able to emigrate. With the help of Trevor Chadwick Gerda was sent to England on a children’s transport in March of 1939.Gerda Mayer was born as Gerda Stein in 1927 in Karlsbad, Czechoslovakia. She emigrated with a Kindertransport to England in 1939.See also Arnold and Erna Stein Collection (AR 5085)Stein, ArnoldStein, KamillaStein, Philip, 1839-1932Anti-SemitismChristmasHolocaus
Mechanical Properties of Skutterudites
No full textThe present article provides a comprehensive compilation and discussion of mechanical properties of unfilled and filled skutterudites, covering thermal expansion, Vickers hardness, the various elastic moduli and fracture toughness, as a function of temperature, composition, density (porosity) and filling level. Differences of thermoelectric properties for p-type and n-type materials as well as between micro- and nano-structured alloys are discussed. Wherever available, experimental data are compared with those from DFT model simulations. As Debye and Einstein temperatures are of importance to define the vibrational spectra of thermoelectric materials, corresponding values extracted from various measurement techniques such as thermal expansion, sound velocity, specific heat, resistivity or X-ray measurements are evaluated
New p- and n-type skutterudites with ZT#gt1 and practically identical thermal expansion and mechanical properties
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