Two-loop mass splittings in electroweak multiplets: winos and minimal dark matter

The radiatively-induced splitting of masses in electroweak multiplets is relevant for both collider phenomenology and dark matter. Precision two-loop corrections of $\mathcal{O}$(MeV) to the triplet mass splitting in the wino limit of the minimal supersymmetric standard model can affect particle lifetimes by up to $40\%$. We improve on previous two-loop self-energy calculations for the wino model by obtaining consistent input parameters to the calculation via two-loop renormalisation-group running, and including the effect of finite light quark masses. We also present the first two-loop calculation of the mass splitting in an electroweak fermionic quintuplet, corresponding to the viable form of minimal dark matter (MDM). We place significant constraints on the lifetimes of the charged and doubly-charged fermions in this model. We find that the two-loop mass splittings in the MDM quintuplet are not constant in the large-mass limit, as might naively be expected from the triplet calculation. This is due to the influence of the additional heavy fermions in loop corrections to the gauge boson propagators.Comment: 31 pages, 10 figures, 2 Table

EXPLORING THE PARADOX OF RWANDAN AGRICULTURAL HOUSEHOLD INCOME AND NUTRITIONAL OUTCOMES IN 1990 AND 2000

Nationally representative surveys regarding sources of income among agricultural households in Rwanda, fielded in 1990 and 2000, provide insights into how families responded to changes in their environment in a turbulent decade. Despite political upheavals and increasing land pressure, the survey evidence suggests that by 2000 average incomes returned to the 1990 level, while the nutritional status among rural children was better in 2000 than in the early 1990s. The nutrition improvement is tempered by evidence of increasing rural inequality. While the least poor households expanded their access to income through skilled labor, the majority of households retreated into a more autarkic mode of production focused on key subsistence crops. The change in crop mix seems to be associated with the improved the nutritional status of children. This has important implications for the current agricultural commercialization strategy in Rwanda and other countries where similar conditions prevail.Consumer/Household Economics, Food Consumption/Nutrition/Food Safety,

Risk assessment for mid-sized organizations : COSO tools for a tailored approach

https://egrove.olemiss.edu/aicpa_guides/2681/thumbnail.jp

Risk assessment for mid-sized companies : tools for developing a tailored approach to risk management

https://egrove.olemiss.edu/aicpa_guides/1814/thumbnail.jp

Torque Auditing Test Fixture for Hansen Medical’s Remote Catheter Manipulator Robot

Current manufacturing test systems for motor control of Hansen\u27s line of surgical robots are labor intensive, have room for operator error and do not supply sufficient information. Based upon an expected increase in production, the objective of this project was to replace their test protocol with a modular test fixture that improves test time, is intuitive to use, and enhances the user experience. We developed a modular design that works for both the Sensei and Magellan robots, and can be reconfigured easily for use on future robots. Using a control system and GUI made in LabVIEW, a magnetic particle as our torque actuator, and a Futek rotary torque sensor for precise data acquisition, our device is a creative, efficient, and effective replacement to Hansen’s quality testing. We successfully develop an equivalent test, surpassed our goal of decreasing test time, our fixture is completely modular for all Hansen’s RCMs, we integrated two tests into a single operation, and we received favorable feedback from the engineers and technicians whom proposed this project. This project succeeded in creating a functional prototype to replace Hansen Medical’s current test protocol. Our test system has been handed off to Hansen Medical for implementation and further development

Selected Papers in Combinatorics - a Volume Dedicated to R.G. Stanton

Professor Stanton has had a very illustrious career. His contributions to mathematics are varied and numerous. He has not only contributed to the mathematical literature as a prominent researcher but has fostered mathematics through his teaching and guidance of young people, his organizational skills and his publishing expertise. The following briefly addresses some of the areas where Ralph Stanton has made major contributions

Short-term Osteoclastic Activity Induced by Locally High Concentrations of Recombinant Human Bone Morphogenetic Protein–2 in a Cancellous Bone Environment

Study Design. An experimental study investigating osteoclastic activity induced by rhBMP-2 in sheep. Objective. To examine the effects of increasing local rhBMP-2 concentration on osteoclastic response and peri-implant bone resorption. Summary of Background Data. Level I clinical studies have established the safe and effective volume and concentration of rhBMP-2 delivered on an absorbable collagen sponge. However, peri-implant bone resorption appearing as decreased mineral density has been observed radiographically in rare instances after implantation of rhBMP-2 on an absorbable collagen sponge (rhBMP-2/ACS). Methods. Bilateral corticocancellous defects were created in the distal femora of 30 adult sheep. Combinations of rhBMP-2/ACS implant volume (V) (1V = normal fill or 2V = overfilled) and rhBMP-2 solution concentration (⤫) (1 ⤫ normal concentration or 3.5 ⤫ = hyperconcentrated) resulted in local rhBMP-2 concentrations of 0⤫, 1⤫, 2⤫, 3.5⤫, and 7⤫ the estimated effective concentration for this model. Faxitron radiography, quantitative CT, histology, and quantitative histomorphometry were conducted in a blinded fashion to analyze the effect of the treatments. Results. At 1 week, the normal fill-normal concentration implants (1⤫) produced the least transient osteoclastic activity resulting in limited peri-implant resorption. Overfilledhyperconcentrated implants (2⤫, 3.5⤫) demonstrated moderate resorption zones. Overfilled-hyperconcentrated implants (7⤫) demonstrated extensive osteoclastic activity and marked resorption. Results at 4 and 8 weeks revealed dense osteoid and bone in the voids with progressive bony healing. Control defects showed no osteoclastic activity with little to no bony healing. Conclusion. Increasing the local rhBMP-2 concentration by overfilling the defect with rhBMP-2/ACS or hyper-concentrating the rhBMP-2 solution on the absorbable collagen sponge led to a concentration-dependent osteoclastic resorption of peri-implant bone. The osteoclastic effect was transient, and progressive healing took place over the 8-week survival period

Shape exploration in design : formalising and supporting a transformational process

The process of sketching can support the sort of transformational thinking that is seen as essential for the interpretation and reinterpretation of ideas in innovative design. Such transformational thinking, however, is not yet well supported by computer-aided design systems. In this paper, outcomes of experimental investigations into the mechanics of sketching are described, in particular those employed by practising architects and industrial designers as they responded to a series of conceptual design tasks,. Analyses of the experimental data suggest that the interactions of designers with their sketches can be formalised according to a finite number of generalised shape rules. A set of shape rules, formalising the reinterpretation and transformations of shapes, e.g. through deformation or restructuring, are presented. These rules are suggestive of the manipulations that need to be afforded in computational tools intended to support designers in design exploration. Accordingly, the results of the experimental investigations informed the development of a prototype shape synthesis system, and a discussion is presented in which the future requirements of such systems are explored

IMPROVING DATA QUALITY WITH FOUR SHORT SENTENCES: HOW AN HONOR CODE CAN MAKE THE DIFFERENCE DURING DATA COLLECTION

Careless responders have a large impact on a study by causing issues such as Type II errors (failing to reject a false null hypothesis), which then waste researchers’ time and money. Research on careless responding has focused primarily on detecting and removing careless responders rather than on reducing careless responding before data collection begins. The purpose of the present study was to test the use of honor codes with or without the presentation of a picture of watchful eyes to increase self-awareness thereby reducing careless responding. Participants (N = 305) were randomly assigned to one of five honor code conditions (control condition, read-only condition, type condition, read-and-eyes condition, or type-and-eyes condition) and then completed a number of personality measures. Participant’s responses were screened for careless responding. I found that when participant’s only read an honor code without a picture of watchful eyes on the screen, they were significantly more likely to engage in careless responding than were people in the control condition. There was no significant difference in careless responding in the control condition compared to the other three conditions (type condition, read-and-eyes condition, or type-and-eyes condition). This finding indicates that participants being presented only with an honor code, and no other cues of moral behavior, might lead to psychological reactance (i.e., participants perceiving their freedom or control was threatened). This psychological reactance was likely due to participants feeling coerced to respond honestly by the honor code rather than participants responding honestly on their own accord. Additionally, there were no differences on participant’s responses across conditions on a number of personality measures that may be sensitive to increased self-awareness. A number of exploratory analyses were also conducted to further examine psychological reactance. The present study provides answers and possible directions to a number of useful questions that could improve data quality and reduce potential negative effects of honor codes under certain circumstances