477 research outputs found
Developing Servant-Leaders Through Service-Learning at a Southwest Christian University: A Quasi-Experimental Study.
this study investigated the effectiveness of service-learning as pedagogy for developing servant-leaders. Participants included 97 students at a faith-based southwest christian university. Fifty-seven of the participants were enrolled in a 15-week servicelearning course (experimental group) and 40 participants were enrolled in similar non-service-learning courses (comparison group). all participants completed the Servant Leadership Questionnaire (SLQ) as a pretest and posttest during the semester. Demographic information was collected in order to determine the participants’ age, gender, grade level, major, previous leadership training, and previous number of service-learning courses. Findings indicated that a student’s major or group (experimental or comparison) made no significant difference in the posttest SLQ scores. the results of this study demonstrate that students in a 15- week service-learning course failed to demonstrate servant leadership development at a greater rate than students who do not participate in 15-week service-learning courses. the discussion considered the impact of a small sample size, the number of previous service-learning courses and leadership development training opportunities, and the servant leadership culture of the university as factors leading to the lack of significance in the testing
SUSY-QCD corrections to stop annihilation into electroweak final states including Coulomb enhancement effects
We present the full supersymmetric QCD corrections
for stop-anti-stop annihilation into electroweak final states within the
Minimal Supersymmetric Standard Model (MSSM). We also incorporate Coulomb
corrections due to gluon exchange between the incoming stops. Numerical results
for the annihilation cross sections and the predicted neutralino relic density
are presented. We show that the impact of the radiative corrections on the
cosmologically preferred region of the parameter space can become larger than
the current experimental uncertainty, shifting the relic bands within the
considered regions of the parameter space by up to a few tens of GeV.Comment: 20 pages, 13 figures, updated to version published in Phys. Rev.
One-loop corrections to gaugino (co-)annihilation into quarks in the MSSM
We present the full supersymmetric QCD corrections
for gaugino annihilation and co-annihilation into light and heavy quarks in the
Minimal Supersymmetric Standard Model (MSSM). We demonstrate that these
channels are phenomenologically relevant within the so-called phenomenological
MSSM. We discuss selected technical details such as the dipole subtraction
method in the case of light quarks and the treatment of the bottom quark mass
and Yukawa coupling. Numerical results for the (co-)annihilation cross sections
and the predicted neutralino relic density are presented. We show that the
impact of including the radiative corrections on the cosmologically preferred
region of the parameter space is larger than the current experimental
uncertainty from Planck data.Comment: 19 pages, 9 figures. Matches version published in Phys.Rev.
Precision predictions for supersymmetric dark matter
The dark matter relic density has been measured by Planck and its
predecessors with an accuracy of about 2%. We present theoretical calculations
with the numerical program DM@NLO in next-to-leading order SUSY QCD and beyond,
which allow to reach this precision for gaugino and squark (co-)annihilations,
and use them to scan the phenomenological MSSM for viable regions, applying
also low-energy, electroweak and hadron collider constraints.Comment: 6 pages, 1 table, 8 figures, proceedings of ICHEP 201
The nonrelativistic limit of the Majorana equation and its simulation in trapped ions
We analyze the Majorana equation in the limit where the particle is at rest.
We show that several counterintuitive features, absent in the rest limit of the
Dirac equation, do appear. Among them, Dirac-like positive energy solutions
that turn into negative energy ones by free evolution, or nonstandard
oscillations and interference between real and imaginary spinor components for
complex solutions. We also study the ultrarelativistic limit, showing that the
Majorana and Dirac equations mutually converge. Furthermore, we propose a
physical implementation in trapped ions.Comment: 7 pages, 1 figure. Proceedings of 18th Central European Workshop on
Quantum Optics (CEWQO 2011), Madrid, Spai
Classification and Ranking of Selectd Arkansas Lakes
Trophic-state related problems associated with waters in the United States have generated tremendous public interest and concern, particularly during the past decade. These interests and concerns led to Public Law 92-500, the mandate by Congress known as the Federal Water Pollution Control Act. Various sections of PL 92-500 directly address the need for trophic-state analyses, particularly Section 314 referred to as the Clean Lakes Program which assigns states the responsibility for classifying their lakes according to water quality, identifying methods of pollution control and restoring those lakes which have become degraded
Propositional Dynamic Logic for Message-Passing Systems
We examine a bidirectional propositional dynamic logic (PDL) for finite and
infinite message sequence charts (MSCs) extending LTL and TLC-. By this kind of
multi-modal logic we can express properties both in the entire future and in
the past of an event. Path expressions strengthen the classical until operator
of temporal logic. For every formula defining an MSC language, we construct a
communicating finite-state machine (CFM) accepting the same language. The CFM
obtained has size exponential in the size of the formula. This synthesis
problem is solved in full generality, i.e., also for MSCs with unbounded
channels. The model checking problem for CFMs and HMSCs turns out to be in
PSPACE for existentially bounded MSCs. Finally, we show that, for PDL with
intersection, the semantics of a formula cannot be captured by a CFM anymore
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A novel knee prosthesis model of implant-related osteo- myelitis in rats
Background and purpose: There have been numerous reports of animal models of osteomyelitis. Very few of these have been prosthesis models that imitate human conditions. We have developed a new rat model of implant-related osteomyelitis that mimics human osteomyelitis, to investigate the pathology of infection after orthop edic implant surgery. Methods: 2 wild-type strains of Staphylococcus aureus, MN8 and UAMS-1, and their corresponding mutants that are unable to produce poly-N-acetyl glucosamine (PNAG) (ica::tet) were injected into the medullary canals of the femur and tibia at 3 different doses: , , and > CFU/rat. We measured clinical signs, inflammatory markers, radiographic signs, histopathology, and bacteriology in the infected animals. Results: An inoculum of at least cfu of either wild-type bacterial strain resulted in histological, bacteriological, and radiographic signs of osteomyelitis with loosening of the prosthesis. An inoculum of CFU gave signs of osteomyelitis but the prosthesis remained in situ. Bacterial inocula of cfu gave no signs of osteolysis. Interpretation: We have established a new knee prosthesis model that is suitable for reliable induction of experimental implant-associated osteomyelitis with the prosthesis in situ, using a small inoculum of S. aureus. At a dose of CFU/rat, bacteria unable to produce PNAG (ica::tet) had only minor defects in their virulence
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