Ten Years of Neutron Physics with Felix Bloch at Stanford, 1938-1949

Paper by Hans H. Stau

Predictors of Corporate Funding for Environmental and Recreational Programs

The purpose of this research was to develop and test a group of predictors that could be used by fundraisers to determine potential corporate support for environmental and recreational programs. Local surveys were conducted to determine environmental and recreational needs for Cache Valley and twenty interviews were held with local corporate managers. The information gathered in these interviews and the literature review provided a list of approximately 20 variables which were narrowed down to 10 to predict both the potential for giving and the level of giving. A proposal for a youth training project was developed and local Forest Service personnel agreed to administer and supervise the program. The proposal was sent to the twenty corporations previously interviewed. Before asking them for a commitment, each corporation was rated on their potential for giving and level of giving. Results were analyzed using the Chi Square and Pearson coefficient and validated the hypothesis

Design, implementation, and evaluation of a shared-memory parellel processing system (SMPPS)

As technology reaches its limits of improvements in microprocessor processing speeds, scientists and engineers have to find viable solutions to meet ever-increasing demands for faster processing speed. One such solution is parallel processing. No longer does one have to wait on sequential operations. A specific task can be split in sub-tasks that can run simultaneously, thus reducing the overall execution time of the task. The design and implementation of these systems is crucial to the effectiveness of parallel systems. A dual-processor SMPPS was designed and implemented in order to demonstrate how multiple processors are a viable solution to increasing the speed of computer processing. Parallel algorithms were developed for this system and were used for performance analysis. The results show that SMPPS systems of a small scale can result in very significant increases in speed for problems characterized by fine-grain parallelism

Transmission of grapevine viroids is not likely to occur mechanically by normal pruning

In epidemiological studies the viroid distribution in two local vineyards was determined. Grapevine leaves of different varieties were collected, total RNA isolated and viroid detected by northern blot analysis and/or reverse transcription followed by PCR amplification. Nearly each sample was infected with the grapevine variant of Hop Stunt Viroid and approximately each second additionally with Grapevine Yellow Speckle Viroid 1. Grapevine Yellow Speckle Viroid 2, a third grapevine viroid, was not found. Both grapevine viroids occurred in chlorotic plants as well as in plants without symptoms. In order to investigate viroid spreading through mechanical transmission accomplished during routine cultural practices, the distribution patterns in the two vineyards were analysed. Our results indicate that grapevine viroids are mainly propagated through systemic transmission upon grafting. The examination of different rootstock clones from Northern Italy, which are used for grafting in Germany, further demonstrates that in this case propagation is not due to rootstocks containing viroid but is more likely to occur via infected scion varieties

Multi-Scale Simulation of Viscoelastic Fiber-Reinforced Composites

This paper presents an effective algorithm to simulate the anisotropic viscoelastic behavior of a fiber-reinforced composite including the influence of the local geometric properties, like fiber-orientation and volume fraction. The considered composites consist of a viscoelastic matrix which is reinforced by elastic fibers. The viscoelastic composite behavior results anisotropic due to the local anisotropic fiber-orientations. The influence of the local time-dependent viscoelastic properties are captured within two elastic microscopic calculations for each fiberorientation in the composite part. These calculations can be performed within a preprocessing step, and thus no expensive, time-dependent viscoelastic multi-scale simulation has to be carried out to incorporate the local properties. The advantage of the presented approach is that the locally varying microscopic properties can be captured in a one-scale simulation within a commercial finite element tool like ABAQUS

Resurrecting light stops after the 125 GeV Higgs in the baryon number violating CMSSM

In order to accommodate the observed Higgs boson mass in the CMSSM, the stops must either be very heavy or the mixing in the stop sector must be very large. Lower stop masses, possibly more accessible at the LHC, still give the correct Higgs mass only if the trilinear stop mixing parameter $|A_t|$ is in the multi-TeV range. Recently it has been shown that such large stop mixing leads to an unstable electroweak vacuum which spontaneously breaks charge or colour. In this work we therefore go beyond the CMSSM and investigate the effects of including baryon number violating operators $\lambda'' \bar{\bf U} \bar{\bf D}\bar{\bf D}$ on the stop and Higgs sectors. We find that for $\lambda'' \simeq {\mathcal{O}}(0.3)$ light stop masses as low as 220 GeV are consistent with the observed Higgs mass as well as flavour constraints while allowing for a stable vacuum. The light stop in this scenario is often the lightest supersymmetric particle. We furthermore discuss the importance of the one-loop corrections involving R-parity violating couplings for a valid prediction of the light stop masses.Comment: 26 pages, 9 figures; v2: slightly extended discussion about bounds from flavour observables; matches published versio