Corrugated structure insertion for extending the SASE bandwidth up to 3% at the European XFEL

The usage of x-ray free electron laser (XFEL) in femtosecond nanocrystallography involves sequential illumination of many small crystals of arbitrary orientation. Hence a wide radiation bandwidth will be useful in order to obtain and to index a larger number of Bragg peaks used for determination of the crystal orientation. Considering the baseline configuration of the European XFEL in Hamburg, and based on beam dynamics simulations, we demonstrate here that the usage of corrugated structures allows for a considerable increase in radiation bandwidth. Data collection with a 3% bandwidth, a few microjoule radiation pulse energy, a few femtosecond pulse duration, and a photon energy of 5.4 keV is possible. For this study we have developed an analytical modal representation of the short-range wake function of the flat corrugated structures for arbitrary offsets of the source and the witness particles.Comment: 29 pages, 17 figure

Numerical Calculation of Coherent Synchrotron Radiation Effects Using TraFiC4

Coherent synchrotron radiation (CSR) occurs when short bunches travel on strongly bent trajectories. Its effects on high-quality beams can be severe and are well understood qualitatively. For quantitative results, however, one has to rely on numerical methods. There exist several simulation codes utilizing different approaches. We describe in some detail the code TraFiC4 developed at DESY for design and analysis purposes, which approaches the problem from first principles and solves the equations of motion either perturbatively or self-consistently. We present some calculational results and comparison with experimental data. Also, we give examples of how the code can be used to design beamlines with minimal emittance growth due to CSR

The Contribution Of Practicing School Counselors\u27 Level Of Altruism To Their Degree Of Burnout

The present study investigated the directional relationship between practicing school counselors’ level of altruism to their degree of burnout. Specifically, this investigation tested the hypothesized directional relationship that practicing school counselors scoring at higher levels of altruism would have lower levels of burnout (emotional exhaustion, depersonalization, personal accomplishment). In addition, the investigation examined the relationship between the practicing school counselors’ levels altruism and burnout and their reported demographic information (e.g., age, school counseling level, self-reported levels of wellness). A thorough review of the literature is presented with supporting empirical research for each construct (altruism and burnout). A descriptive, correlational research design (Frankel et al., 2012) was employed to investigate the research hypothesis and exploratory questions. The research hypothesis was analyzed using structural equation modeling (SEM). More specifically, multiple regression, path analysis, and confirmatory factor analysis (Ullman, 2007) were conducted. The exploratory research questions were examined using: descriptive statistics, Spearman’s rho correlations, multiple regressions, Kruskal-Wallis test and Mann Whitney U test (Pallant, 2010). The results are reviewed and compared to existing research in the field. Furthermore, limitations of the current study are explained, and recommendations for future research are provided. Finally, implications of the study regarding professional school counseling and counselor education are discussed. The overall sample for this study is 437 practicing school counselors (ASCA members, n = 344; non-ASCA members, n = 93). The results of the study support that school counselors with higher levels of altruism have lower levels of burnout. The findings of this study show two dimensions of altruistic motivation: (1) positive future expectations and (2) self-efficacy v contribute significantly to all dimensions of burnout (emotional exhaustion, depersonalization, and personal accomplishment). Additionally, a significant relationship was found between altruism and burnout and self-reported wellness

Servant Leadership and the Military Professional: how do Military Professionals Practice Servant Leadership in Their Lives as Leaders?

Military organizations, like the U.S. Army, traditionally are mission driven entities and organizational success is paramount in all military endeavors. The purpose of this research is to investigate the relationship between leadership practices of military professionals and the characteristics of Servant Leadership. The specific research question is: How do military professionals practice Servant Leadership in the conduct of their lives as leaders? The examination of this question will further ground Servant Leadership as a tangible leadership model in a large organization. This study will qualitatively examine four military professionals through a series of interviews and determine what leader actions they have taken that are derived from Servant Leadership

Upland Land Use and Intersite Lithic Assemblage Variation Across Two Rockshelter and Three Open-Air Archaeological Sites in Mount Rainier National Park

Two sites from the Late Holocene period, the Fryingpan and Berkeley Rockshelters, are analyzed using an evolutionary archaeology model to test hypotheses about site-type expectations. Under the existing theoretical model, rockshelter sites on the slopes of Mount Rainier were used for a more limited activity set than some open-air sites. Rockshelter sites are thought to be places of short-term occupancy consistent with hunting and/or overnight residence activities. Large open-air sites with relatively dense and materially diverse lithic artifacts are thought to be longer-term residential base camps. Technological and functional paradigmatic lithic classifications are used to measure how rockshelter and larger open-air sites vary. The analysis is reduced further to focus on how the two rockshelter sites vary independent to each other, compared to the open-air Sunrise Ridge Borrow Pit site. Non-random associations of data frequencies across technological variables exhibited by the lithic assemblages determined that rockshelter lithic assemblages are representative of a truncated range of variability compared to open-air site assemblages

Rationalizing Mechanism Preference in Independent Private Value Auctions

In this thesis we conduct a laboratory experiment to examine the preferences of sellers and buyers for the reserve price mechanism and test their rationalizability. We use a stylized independent private value environment, a second price auction institution and a first price auction institution to investigate if the preference is monetizable. We find that the revealed preference of the sellers does not translate on the aggregate level and partially on the individual level. Further, sellers who choose public reserve prices set higher reserve prices and achieve higher sales prices. Lastly, we find that buyers are willing to pay to obtain the reserve price information

The interrelation of personal and social problems

Thesis (M.A.)--Boston University, 1948. This item was digitized by the Internet Archive

Claims, Evidence and Reasoning: A Framework for Evidence-Based Writing on the subject of Evolution

The aim of this qualitative research was to explore how students presented reasoned arguments supported by evidence and reasoning after receiving constructivist-based instruction. The author documents the details of the results and uses related research literature to construct meaning and validate constructivist pedagogy and the evidencebased writing instruction. The progress of twenty students’ ability to write a claim, give specific evidence and reasoning was followed throughout the investigation. Three themes emerged from this investigation: students showed a steady trend of intellectual growth over time, students benefitted when they constructed their own learning, and students struggled with written reasoning and connecting reasoning to broader scientific concepts. Students showed overall growth with all students making gains throughout the investigation