Na 1 Nachlass Max Horkheimer, 592 - Korrespondenzen mit Friedrich (Frederick) Pollock (p. VI 38A, 1-318)

2 Briefe von Frederick Pollock an Leo Löwenthal; 1 Brief von Alice H. Maier an Frederick Pollock, 23.05.1957; 6 Briefe zwischen Frederick Pollock und Emmy Henne; 1 Brief von Frederick Pollock an Lix Weil, 24.12.1957; 1 Brief von Frederick Pollock an Alice H. Maier, 05.12.1957; 4 Briefe von Frederick Pollock an Emmy Henne; 3 Briefe zwischen Frederick Pollock und Leo Löwenthal; 1 Brief von Jos. N. Minissale an Frederick Pollock, 03.07.1957;

Na 1 Nachlass Max Horkheimer, 593 - Korrespondenzen mit Friedrich (Frederick) Pollock (p. VI 39, 1-420)

1 Brief von Frederick Pollock an Albert Rosenberg, 28.12.1958; 1 Telegramm von Max Horkheimer an Albert Rosenberg, 05.01.1958; 2 Briefe zwischen Leo Löwenthal und Frederick Pollock, 1958; 1 Brief von Leo Löwenthal an Paul Lazarsfeld, 21.02.1958; 1 Brief von Paolo Bosia an Frederick Pollock, 03.05.1958; 1 Brief von der Deutschen Angestellten Gewerkschaft (Hamburg) an Max Horkheimer, 27.03.1958; 1 Brief von Max Horkheimer an E. Brüche, 11.04.1958; 1 Brief von Leo Löwenthal an Paul F. Lazarsfeld, 21.02.1958; 1 Brief von E. Heinicke an Emmy Henne, 10.03.1958; 1 Brief von Emmy Henne an das Hotel "Haus Westend" (Frankfurt/M.), 28.02.1958; 1 Brief von Frederick Pollock an Helene Weigel, 17.02.1958; 1 Brief von Frederick Pollock an Peter Alther (Rechtsanwalt), 09.11.1959; 1 Brief von Theodor W. Adorno an Frederick Pollock, 31.08.1959;

International comparison of wait times and quality of care: A pilot study

During the healthcare reform debate in the United States in 2009/2010, many health policy experts expressed a concern that expanding coverage would increase waiting times for patients to obtain care. Many complained that delays in obtaining care in turn would compromise the quality of healthcare in the United States. Using data from The Commonwealth Fund 2010 International Health Policy Survey in Eleven Countries, this study explored the relationship between wait times and quality of care, employing a wait time scale and several quality of care indicators present in the dataset. The impact of wait times on quality was assessed. Increased wait time was expected to reduce quality of care. However, this study found that wait times correlated with better health outcomes for some measures, and had no association with others. Since this is a pilot study and statistical significance was not achieved for any of the correlations, further research is needed to confirm and deepen the findings. However, if future studies confirm this finding, an emphasis on reducing wait times at the expense of other health system level performance variables may be inappropriate. ^

Design, Calibration, and Evaluation of Depth-of-Interaction-Capable PET Detector Modules

High-resolution, small-bore PET systems suffer from a tradeoff between system sensitivity, and image quality degradation. In these systems long crystals allow mispositioning of the line of response due to parallax error and this mispositioning causes resolution blurring, but long crystals are necessary for high system sensitivity. One means to allow long crystals without introducing parallax errors is to determine the depth of interaction (DOI) of the gamma ray interaction within the detector module. While DOI has been investigated previously, newly available solid state photomultipliers (SSPMs) well-suited to PET applications and allow new modules for investigation. Depth of interaction in full modules is a relatively new field, and so even if high performance DOI capable modules were available, the appropriate means to characterize and calibrate the modules are not. This work presents an investigation of DOI capable arrays and techniques for characterizing and calibrating those modules. The methods introduced here accurately and reliably characterize and calibrate energy, timing, and event interaction positioning. Additionally presented is a characterization of the spatial resolution of DOI capable modules and a measurement of DOI effects for different angles between detector modules. These arrays have been built into a prototype PET system that delivers better than 2.0 mm resolution with a single-sided-stopping-power in excess of 95% for 511 keV g's. The noise properties of SSPMs scale with the active area of the detector face, and so the best signal-to-noise ratio is possible with parallel readout of each SSPM photodetector pixel rather than multiplexing signals together. This work additionally investigates several algorithms for improving timing performance using timing information from multiple SSPM pixels when light is distributed among several photodetectors.

A relationship between aerosol transport and compound-specific d13C land plant biomarker and pollen records

We examined near-surface, late Holocene deep-sea sediments at nine sites on a north-south transect from the Congo Fan (4°S) to the Cape Basin (30°S) along the Southwest African continental margin. Contents, distribution patterns and molecular stable carbon isotope signatures of long-chain n-alkanes (C27-C33) and n-alkanols (C22-C32) are indicators of land plant vegetation of different biosynthetic types, which can be correlated with concentrations and distributions of pollen taxa in the same sediments. Calculated clusters of wind trajectories and satellite Aerosol Index imagery afford information on the source areas for the lipids and pollen on land and their transport pathways to the ocean sites. This multidisciplinary approach on an almost continental scale provides clear evidence of latitudinal differences in lipid and pollen composition paralleling the major phytogeographic zonations on the adjacent continent. Dust and smoke aerosols are mainly derived from the western and central South African hinterland dominated by deserts, semi-deserts and savannah regions rich in C4 and CAM plants. The northern sites (Congo Fan area and northern Angola Basin), which get most of their terrestrial material from the Congo Basin and the Angolan highlands, may also receive some material from the Chad region. Very little aerosol from the African continent is transported to the most southerly sites in the Cape Basin. As can be expected from the present position of the phytogeographic zones, the carbon isotopic signatures of the n-alkanes and n-alkanols both become isotopically more enriched in 13C from north to south. The results of the study suggest that this combination of pollen data and compound-specific isotope geochemical proxies can be effectively applied in the reconstruction of past continental phytogeographic developments.