Computer aids for worst case electronic circuit design

Computer aids for worst case electronic circuit desig

On the Elevated Temperature Thermal Stability of Nanoscale Mn-Ni-Si Precipitates Formed at Lower Temperature in Highly Irradiated Reactor Pressure Vessel Steels.

Atom probe tomography (APT) and scanning transmission electron microscopy (STEM) techniques were used to probe the long-time thermal stability of nm-scale Mn-Ni-Si precipitates (MNSPs) formed in intermediate and high Ni reactor pressure vessel steels under high fluence neutron irradiation at ≈320 °C. Post irradiation annealing (PIA) at 425 °C for up to 57 weeks was used to determine if the MNSPs are: (a) non-equilibrium solute clusters formed and sustained by radiation induced segregation (RIS); or, (b) equilibrium G or Γ2 phases, that precipitate at accelerated rates due to radiation enhanced diffusion (RED). Note the latter is consistent with both thermodynamic models and x-ray diffraction (XRD) measurements. Both the experimental and an independently calibrated cluster dynamics (CD) model results show that the stability of the MNSPs is very sensitive to the alloy Ni and, to a lesser extent, Mn content. Thus, a small fraction of the largest MNSPs in the high Ni steel persist, and begin to coarsen at long times. These results suggest that the MNSPs remain a stable phase, even at 105 °C higher than they formed at, thus are most certainly equilibrium phases at much lower service relevant temperatures of ≈290 °C

Implications of gauge-mediated supersymmetry breaking with vector-like quarks and a ~125 GeV Higgs boson

We investigate the implications of models that achieve a Standard Model-like Higgs boson of mass near 125 GeV by introducing additional TeV-scale supermultiplets in the vector-like 10+\bar{10} representation of SU(5), within the context of gauge-mediated supersymmetry breaking. We study the resulting mass spectrum of superpartners, comparing and contrasting to the usual gauge-mediated and CMSSM scenarios, and discuss implications for LHC supersymmetry searches. This approach implies that exotic vector-like fermions t'_{1,2}, b',and \tau' should be within the reach of the LHC. We discuss the masses, the couplings to electroweak bosons, and the decay branching ratios of the exotic fermions, with and without various unification assumptions for the mass and mixing parameters. We comment on LHC prospects for discovery of the exotic fermion states, both for decays that are prompt and non-prompt on detector-crossing time scales.Comment: 32 pages. v2: references added, figure caption 5.3 correcte

Cellular automaton model of precipitation/dissolution coupled with solute transport

Precipitation/dissolution reactions coupled with solute transport are modelled as a cellular automaton in which solute molecules perform a random walk on a regular lattice and react according to a local probabilistic rule. Stationary solid particles dissolve with a certain probability and, provided solid is already present or the solution is saturated, solute particles have a probability to precipitate. In our simulation of the dissolution of a solid block inside uniformly flowing water we obtain solid precipitation downstream from the original solid edge, in contrast to the standard reaction-transport equations. The observed effect is the result of fluctuations in solute density and diminishes when we average over a larger ensemble. The additional precipitation of solid is accompanied by a substantial reduction in the relatively small solute concentration. The model is appropriate for the study of the r\^ole of intrinsic fluctuations in the presence of reaction thresholds and can be employed to investigate porosity changes associated with the carbonation of cement.Comment: LaTeX file, 13 pages. To appear in Journal of Statistical Physics (Proceedings of Lattice Gas'94, June 1994, Princeton). Figures available from author. Requests may be submitted by E-mail ([email protected]) or ordinary mail (Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

A study of weather-dependent data links for deep space applications

Weather-dependent data links for deep space applications, and five potential system

Gravity anomaly detection: Apollo/Soyuz

The Goddard Apollo-Soyuz Geodynamics Experiment is described. It was performed to demonstrate the feasibility of tracking and recovering high frequency components of the earth's gravity field by utilizing a synchronous orbiting tracking station such as ATS-6. Gravity anomalies of 5 MGLS or larger having wavelengths of 300 to 1000 kilometers on the earth's surface are important for geologic studies of the upper layers of the earth's crust. Short wavelength Earth's gravity anomalies were detected from space. Two prime areas of data collection were selected for the experiment: (1) the center of the African continent and (2) the Indian Ocean Depression centered at 5% north latitude and 75% east longitude. Preliminary results show that the detectability objective of the experiment was met in both areas as well as at several additional anomalous areas around the globe. Gravity anomalies of the Karakoram and Himalayan mountain ranges, ocean trenches, as well as the Diamantina Depth, can be seen. Maps outlining the anomalies discovered are shown

Illegal dumping and crime prevention: A case study of Ash Road, Liverpool Council

Illegal waste disposal is an increasingly significant and costly problem. This paper considers a specific hot-spot for illegal dumping in Sydney, Australia from criminological perspectives. We contribute to the developing criminological literature that considers environmental harms as a crime. This draws upon the symbolic aspect of criminal law, contributing to the notion of environmental harms as wrongs worthy of sanction, and facilitates analysis through the prism of criminological literature. We apply theories of crime prevention to the site and argue that these techniques of crime prevention would be cheaper and more effective long-term than current council responses of simply reacting to dumping after it has occurre

Victim Characteristics and Victim Impact Evidence in South Carolina Capital Cases

The use of victim impact evidence (VIE) has been a standard feature of capital trials since 1991, when the Supreme Court lifted the previously existing constitutional bar to such evidence. Legal scholars have almost universally condemned the use of VIE, criticizing it on a variety of grounds. Yet little empirical analysis exists that examines how VIE influences the course and outcome of capital trials. We analyze the influence of VIE based on interviews with over two-hundred jurors who sat on capital trials in South Carolina between 1985 and 2001. First, we describe the VIE introduced at sentencing trials, using a subset of the interviews that posed questions directly focusing on VIE. Second, we analyze a factor closely related to, and influenced by, VIE--a factor we refer to as victim admirability. We find evidence of a strong correlation between victim admirability and VIE use. Victim admirability substantially increases with the increased use and refinement of VIE. In addition, we find some correlation between victim admirability and jurors\u27 perceived seriousness of the crime. Our third topic focuses on sentencing outcomes. We study the relation between capital sentencing outcomes and VIE itself, as well as the relation between victim admirability--found to be influenced by VIE--and capital sentencing outcomes. We find no significant relation between increased victim admirability and juror capital sentencing votes, nor do we find a significant relation between the introduction of VIE and sentencing outcomes

Forecasting Life and Death: Juror Race, Religion, and Attitude Toward the Death Penalty

Determining whether race, sex, or other juror characteristics influence how capital case jurors vote is difficult. Jurors tend to vote for death in more egregious cases and for life in less egregious cases no matter what their own characteristics. And a juror\u27s personal characteristics may get lost in the process of deliberation because the final verdict reflects the jury\u27s will, not the individual juror\u27s. Controlling for the facts likely to influence a juror\u27s verdict helps to isolate the influence of a juror\u27s personal characteristics. Examining each juror\u27s first sentencing vote reveals her own judgment before the majority works its will. Race, religion, and how strongly the juror believes death is the appropriate punishment for murder influence a capital juror\u27s first vote, which usually determines the final vote. Because black jurors are rarely a majority of the jury\u27s members, majority rule usually means white rule