2,237 research outputs found
Schaefer (Peter) et al Synopse zur Hekhalot-Literatur
No full textDubois Jean-Daniel. Schaefer (Peter) et al Synopse zur Hekhalot-Literatur. In: Archives de sciences sociales des religions, n°56/2, 1983. p. 304
simon_online_appendix – Supplemental material for Disapproved, but Tolerated: The Role of Respect in Outgroup Tolerance
No full textSupplemental material, simon_online_appendix for Disapproved, but Tolerated: The Role of Respect in Outgroup Tolerance by Bernd Simon, Silke Eschert, Christoph Daniel Schaefer, Klaus Michael Reininger, Steffen Zitzmann and Heather J. Smith in Personality and Social Psychology Bulletin</p
Hydrogen interaction with Al(111) and Ti-doped Al(111) surfaces for H storage applications
No full textComplex metal hydrides are promising candidates for hydrogen storage applications.
Most of these materials consist of aluminum mixed with other elements. It was found
that titanium doping allows their use in a convenient temperature and pressure range.
Therefore the key process is the dissociation of molecular hydrogen at a Ti catalyst on the surface. Preliminary studies with pure and titanium-doped aluminum surfaces are
undertaken to gain a basic understanding of the hydrogen adsorption mechanism.
The interaction of hydrogen with an Al(111) surface was studied using Infrared Reflection
Absorption Spectroscopy (IRRAS) under Ultra High Vacuum (UHV) conditions. Hereby the formation of aluminum hydrides (alanes) in different sizes was observed depending on the hydrogen coverage of the surface. The growth of larger alanes is favored at higher H exposures. Different measurements were carried out for temperatures of 93, 180 and 259K and it was found that larger alanes form at higher temperatures.
In another step of the experiment an Al surface was doped with titanium atoms emitted from a home-built Ti-source. Ti structures with a thickness of less than one monolayer (ML) were grown at 105K and a Ti film of around one ML was deposited at room temperature. The deposition rate was determined with a quartz crystal monitor and the deposition on the surface could be verified by Auger Electron Spectroscopy (AES). Low Energy Electron Diffraction (LEED) patterns were recorded before and after different Ti-depositions and were always showing the typical hexagonal symmetry for the closed packed (111) surface of the fcc Al crystal.
To compare the vibrational modes of alanes forming on Al(111) surfaces with the ones of solid state AlH3 Fourier Transform Infrared Spectroscopy (FTIR) was performed in a different setup using a high vacuum. No matches of the frequencies could be found but the decomposition of AlH3 to Al and H could be observed at temperatures higher than 170°C.M.S.Includes bibliographical references (p. 74-76)
36004_Appendix – Supplemental material for Sport-Specific Associations of Specialization and Sex With Overuse Injury in Youth Athletes
No full textSupplemental material, 36004_Appendix for Sport-Specific Associations of Specialization and Sex With Overuse Injury in Youth Athletes by Eric G. Post, Kevin M. Biese, Daniel A. Schaefer, Andrew M. Watson, Timothy A. McGuine, M. Alison Brooks and David R. Bell in Sports Health: A Multidisciplinary Approach</p
Adsorbate enhancement of electron emission during the quenching of metastable CO at metal surfaces.
No full textWhen electronically excited CO(a3Π) collides with a Au(111) surface, electron emission can be observed with a quantum efficiency of 0.13. We have studied the influence of Ar, Kr and Xe adsorption on the electron emission efficiency resulting from CO(a3Π) quenching. Surprisingly, a single monolayer (ML) of rare gas dramatically enhances electron emission. For Ar and Kr bilayers, emission efficiency is further enhanced and approaches unity. The quenching mechanism involves electron transfer from the metal to the CO(a3Π) molecule followed by electron emission from the molecule. The enhanced emission efficiency is due to the long range nature of the initial electron transfer process and the rare gas adlayer's ability to reflect the electron emitted by the transient CO anion. This work shows that CO(a3Π) quenching is a useful model system for investigating the fate of electronically excited molecules at surfaces
The long-term unemployed in the wake of the Great Recession
No full textUsing the Annual Social and Economic Supplement of the Current Population Survey, this brief outlines the demographic and economic characteristics of the long-term unemployed and compares them with their short-term unemployed counterparts. It also describes changes in the composition of the long-term unemployed since the start of the Great Recession. Author Andrew Schaefer reports that the percentage of unemployed workers who were seeking employment for more than six months more than doubled between 2007 and 2013 from 18.4 percent to 39.3 percent and that the long-term unemployed are more likely than the short-term unemployed to live in urban areas. In addition, the urban long-term unemployed are more likely to be older, but less likely to be poor than their rural counterparts. He concludes that, as debate about the extension of Emergency Unemployment Compensation benefits continues, it is important to gain an understanding of the long-term unemployed in terms of their demographic and economic characteristics and how those characteristics differ across place in order to help better target strategies for alleviating the negative effects of long-term unemployment
Synthesis of Cost-optimized Controllers from Scenario-based GR(1) Specifications
No full textModern systems often consist of many software-controlled components which must cooperate to fulfill difficult to achieve goals. Each component must properly react to both, external events, e.g., user inputs, and internal events, i.e., actions of other components. Making each component behave such that the cost of running the system is minimized, e.g., by minimizing total energy consumption, adds additional complexity. To support engineers in the difficult design of such systems we developed a scenario-based specification approach enabling the intuitive modeling of goals and assumptions using short scenarios. These specifications can be simulated and automatically analyzed, allowing defects to be detected and fixed early in the development process. In this paper we present and evaluate an extension to our approach which makes it possible to model costs of processes and thus to synthesize controllers which not only guarantee that the specified goals are fulfilled but are being fulfilled in a cost-optimized manner. Our approach even considers the transfer of energy between components to enable the design of systems in which, e.g., the braking energy of moving components can be leveraged to reduce the cost and environmental impact of a system instead of wasting this energy in the form of heat
Quality of life after low-dose rate-brachytherapy for prostate carcinoma – long-term results and literature review on QLQ-C30 and QLQ-PR25 results in published brachytherapy series
No full textAbstract Background Patient-reported health-related quality of life (HRQOL) differs between treatment options for prostate carcinoma. Long-term HRQOL data in brachytherapy series are scarce. Therefore, we analyzed prostate-specific and general HRQOL in patients treated with brachytherapy for prostate carcinoma after long-term follow-up. Methods Two hundred ninety-six patients with prostate carcinoma were treated with brachytherapy (01/1998–11/2003). General and prostate-specific HRQOL were measured using EORTC-QLQ-C30 and EORTC-QLQ-PR25, respectively. Patients were asked to complete the questionnaires after a median follow-up of 141 (119–181) months. QLQ-C30 results were compared to the German reference population. QLQ-PR25 results were compared to an earlier follow-up after a median of 51 months (no published QLQ-PR25 reference population for comparison). Additionally, a literature review on HRQOL data in brachytherapy series was performed. Results One hundred six (35.8%) patients were lost to follow-up, 70 (23.6%) had died. 120 (40.5%) patients were contacted. 80 questionnaires were returned (27% of the original cohort; 91% of alive patients were ≥70 years). Sexual activity declined over time (mean scores: 40.5 vs. 45.5; p = 0.006), hormonal treatment-related symptoms, problems associated with incontinence aids, and burden of obstructive urinary symptoms did not differ significantly compared to the 51-month follow-up. General HRQOL was numerically better in our cohort as compared to the German reference population (> 16% relative difference for both age strata; < 70 and ≥70 years). Conclusions Our results indicate that symptom-burden after long-term follow-up and associated prostate-specific HRQOL remains relatively stable from 51 to 141 months. General HRQOL in surviving patients was numerically better compared to the reference population
Taming the Software Development Complexity with Domain Specific Languages
No full textModern computed tomography (CT) scanners are highly complex and flexible devices. This versatility is realized with a multitude of interconnected parameters and rules which are defined by domain experts in so-called scanner model specifications distributed over almost one hundred documents. The primarily used tools to write these documents (e.g. MS Word, MS Excel) are domain agnostic and they support only plain natural-language for the specification. Consequently, maintaining a valid scanner specification is a tedious, error-prone and therefore expensive process. To tackle the complexity of scanners parameters specifications, over the last two years we developed and deployed an eco-system of domain specific languages (DSLs) and associated tooling, covering a central portion of the scanner domain. The languages are developed using the Jetbrains’ MPS language workbench. In this paper, we present our experiences with developing our language eco-system. We briefly describe the language architecture, the design and development process that led us there, and discuss variation points of our approach and present in more detail a set of lessons learnt and best practices
Vibrational enhancement of electron emission in CO (a<sup>3</sup>Π) quenching at a clean metal surface
No full textWe have combined a Stark decelerator with a molecular beam-surface scattering setup to accurately measure the absolute electron emission yield, γ, of CO (a3Π) quenching at a Au(111) surface with quantum state resolution. We clearly observe an enhanced probability of electron emission when scattering vibrationally excited states of CO from the surface
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