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Hellmann-Kirchberger family collection 1710-2014 1863-1915, 1937-1950
No full textThe collection holds diaries, memoirs, reports, letters and papers pertaining to five generations of the Hellmann-Kirchberger family. A prominent topic is the life of the family in the Lahn area in Rhineland in the 18th and 19th century. Additional topics are the emigration from Nazi-Germany and immigration to the United States. Letters and diaries that are included in the collection draw an intense picture of the distinct impacts of historical and social events from the 18th until the beginning of the 21st century.Prominent figures of the collection are, among others, Theodor Kirchberger, born on July 17, 1849, the son of Jacob Kirchberger, born in 1812, and Sophie Kirchberger, née Meyer Herz. Several diaries, reports and letters of their children and (great-) grandchildren are included in the collection.The Meyer-Herz, Kirchberger and Hellmann families were linked in 1907 through the marriage of Hedwig Kirchberger and Emil Hellmann. Both families maintained houses in Niederlahnstein and Weilburg in Rhineland, Germany for generations and were established in the region. The roots of the Kirchberger family in the Lahn area date back to the 17th century. Although the main part of the area’s inhabitants was Catholic, several old-established Jewish families lived in Niederlahnstein, Weilburg and the surroundings.ProcessedHellmann, Emil, -1944 ; Hellmann, Klaus, 1912-2009 ; Hellmann, Sieglinde, 1916-2015 ; Hellmann, Ulric, 1910-1999 ; Kirchberger, Matilde, 1872-1945 ; Kirchberger, Reinhard, 1909-1995 ; Kirchberger, Sophiedigitize
Hellmann and Kromwell Families Collection 1778-1982
No full textThe Hellmann-Kromwell Family Collection includes a variety of documents of genealogical interest, including wedding, birth, and death announcements and family trees, with a particular emphasis on Dr. Johanna Hellmann's life and work. Some correspondence from the physicist Lise Meitner and the education reformer Helene Lange is also present.Johanna Hellmann was born in Nuremberg in 1899. At a young age, she became determined to study at a university. From 1912 until 1925 she completed medical training first in Berlin with Hans Virchow and later in Kiel in order to specialize as a surgeon. Remaining in Kiel during World War I, she assisted in the care of soldiers sent from the front. In 1916 she adopted a child, Irmgard Ahrendt, whose mother had died while pregnant and whose father was recuperating from a war injury. In 1921, the father began legal proceedings to have his daughter returned to his custody, and he eventually won. From 1929-1938 she worked as surgeon, urologist, and radiologist at the Charité clinic in Berlin, through which she oversaw the restructuring of a Salvation Army maternity ward to include a full surgical division. In 1938 she was forced by the Nazi government out of her position as head doctor and emigrated to Stockholm. During the time period from 1938-1947 she faced bureaucratic difficulties in obtaining regular work as a surgeon in Sweden. Also during this period she adopted a patient's daughter; this adoption became official, however, only in 1966. From 1947 onwards she was permitted to operate a private practice as an abdominal surgeon at the Red Cross Hospital in Stockholm, and she also authored papers with former mentor and German colleague Dr. Willy Anschütz on radiation treatment of breast cancer. She died in 1982 in Stockholm.Sophie Hellmann was born in 1894 in Nuremberg. Her father was the merchant David Hellmann, her mother was Fanny nee Kromwell. She served as a nurse in World War I and worked as a secretary in Belgium until 1918. She returned to Germany and worked in Berlin and Munich, where she became the private assistant to the economist Hanns Dorn, a position she held until his death in 1934. Since it was difficult for her to find employment, she immigrated to Denmark in 1935, where she was hired as Niels Bohr's private secreatry. In 1943, she fled to Sweden and worked as a secreatry and translator for J. Runnstrom. She returned to Demark and her work for Niels Bohr in 1945. After his death, she continued to work as translator and editor for scientific publications until her retirement at age 70. She died in 1979.The Kromwell family of Gunzenhausen, Middle Franconia, is related to Sophie and Johanna Hellmann through their mother Fanny Hellmann née Kromwell.The original inventory is available in folder 1.Processed for digitizationEAD createdReviseddigitize
Evolution of social networks
No full textHellmann T, Staudigl M. Evolution of social networks. European Journal of Operational Research. 2014;234(3):583-596.Modeling the evolution of networks is central to our understanding of large communication systems, and more general, modern economic and social systems. The research on social and economic networks is truly interdisciplinary and the number of proposed models is huge. In this survey we discuss a small selection of modeling approaches, covering classical random graph models, and game-theoretic models to analyze the evolution of social networks. Based on these two basic modeling paradigms, we introduce co-evolutionary models of networks and play as a potential synthesis. (C) 2013 Elsevier B.V. All rights reserved
The Evolution of R&D Networks
No full textDawid H, Hellmann T. The Evolution of R&D Networks. Journal of Economic Behavior and Organization. 2014;105:158-172.We study the evolution of R&D networks in a Cournot model whererms may lower marginal costs due to bilateral R&D collaborations. Stochastically stable R&D networks exhibit the dominant group architecture, and, contrary to the existing literature, generically unique predictions about the size of the dominant group can be obtained. This size decreases monotonically with respect to the cost of link formation and there exists a lower bound on the size of the dominant group for non-empty networks. Stochastically stable networks are always inefficient and an increase in linking costs has a non-monotone effect on average industry profits
Strategic formation of homogeneous bargaining networks
No full textGauer F, Hellmann T. Strategic formation of homogeneous bargaining networks. GAMES AND ECONOMIC BEHAVIOR. 2017;106:51-74.We study a model of strategic network formation prior to a Manea (2011a) bargaining game: ex ante homogeneous players form costly undirected links, anticipating expected equilibrium payoffs from the subsequent bargaining game. Assuming patient players, we provide a complete characterization of generically pairwise stable networks: specific unions of separated pairs, odd circles, and isolated players constitute this class. We also show that many other structures, such as larger trees or unbalanced bipartite networks, cannot be pairwise stable at all. The analysis implies that the diversity of possible bargaining outcomes is small in (generically) pairwise stable networks. (C) 2017 Elsevier Inc. All rights reserved
What Ottawa Can Do
No full textInjecting more public money into the venture capital industry will not on its own ensure success, say University of British Columbia’s James Brander and Thomas
Hellmann, and IRPP’s Tyler Meredith. The authors argue that, as the federal government allocates $400 million in new support for venture capital, it must avoid the past pitfall of using the money to meet political goals. It must embrace a system that promotes competition and performance, and work with the provinces to transform how governments support venture capital
Salinization Processes in the Venetian Coastal Plain (Italy): A General Overview
No full textDue to its location near the Venice Lagoon and the Adriatic Sea, as well anthropogenic pressure, the Venetian inland is a densely populated area undergoing salinization processes of soil and groundwater. This strongly affects the economical and social development of the area, in particular agricultural and touristic activities, and the weathering of building materials in urban settlements. This research aims at assessing the present degree of subsoil and groundwater salinization, and identifying critical conditions in relation to economic activities such as agriculture and tourism
The stochastic Feynman-Hellmann method
No full textThe Feynman-Hellmann method, as implemented by Bouchard et al. [1612.06963], was recently employed successfully to determine the nucleon axial charge. A limitation of the method was the restriction to a single operator and a single momentum during the computation of each "Feynman-Hellmann" propagator. By using stochastic techniques to estimate the all-to-all propagator, we relax this constraint and demonstrate the successful implementation of this new method. We show reproduction of the axial charge on a test ensemble and non-zero momentum transfer points of the axial and vector form factors
Les droits fondamentaux à l'èpreuve de la prison
No full textIl contributo analizza la questione carceraria a livello nazionale ed internazionale. In particolare si affronta il tema dei diritti dei detenuti perchè impatta sul tema dei diritti fondamentali. L'analisi è ben più articolare perchè porta a ripensare le forme di privazione di libertà e le alternative; ad andare oltre la questione delle pene detentive per confrontare le misure di sicurezza e di prevenzione personali con i diritti fondamentali; ad interrogarsi su come preservare la dignità in carcere. Tale riflessione sul mondo carcerario è necessaria per consolidare l'Europa dei diritti e costruire una cultura europea
Convexity and complementarity in network formation. Implications for the structure of pairwise stable networks
No full textHellmann T. Convexity and complementarity in network formation. Implications for the structure of pairwise stable networks. Working Papers. Institute of Mathematical Economics. Vol 423. Bielefeld: Universität Bielefeld; 2009.This paper studies the properties of convexity (concavity) and strategic complements (substitutes) in network formation and the implications for the structure of pairwise stable networks. First, different definitions of convexity (concavity) in own links from the literature are put into the context of diminishing marginal utility of own links. Second, it is shown that there always exists a pairwise stable network as long as the utility function of each player satisfies convexity in own links and strategic complements. For network societies with a profile of utility functions satisfying concavity in own links and strategic complements, a local uniqueness property of pairwise stable networks is derived. The results do neither require any specification on the utility function nor any other additional assumptions such as homogeneity
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