Phase field modelling of surfactants in multi-phase flow

A diffuse interface model for surfactants in multi-phase flow with three or more fluids is derived. A system of Cahn-Hilliard equations is coupled with a Navier-Stokes system and an advection-diffusion equation for the surfactant ensuring thermodynamic consistency. By an asymptotic analysis the model can be related to a moving boundary problem in the sharp interface limit, which is derived from first principles. Results from numerical simulations support the theoretical findings. The main novelties are centred around the conditions in the triple junctions where three fluids meet. Specifically the case of local chemical equilibrium with respect to the surfactant is considered, which allows for interfacial surfactant flow through the triple junctions

Advanced Techniques for Multiparton Loop Calculations: A Minireview

We present an overview of techniques developed in recent years for the efficient calculation of one-loop multiparton amplitudes, in particular those relying on unitarity and collinear factorization.Comment: 5 pages, LaTeX/aipproc, presented at DIS '97, Chicago, IL, April 14-18, 199

One-Loop Self-Dual and N=4 Super Yang-Mills

We conjecture a simple relationship between the one-loop maximally helicity violating gluon amplitudes of ordinary QCD (all helicities identical) and those of N=4 supersymmetric Yang-Mills (all but two helicities identical). Because the amplitudes in self-dual Yang Mills have been shown to be the same as the maximally helicity violating ones in QCD, this conjecture implies that they are also related to the maximally helicity violating ones of N=4 supersymmetric Yang-Mills. We have an explicit proof of the relation up to the six-point amplitude; for amplitudes with more external legs, it remains a conjecture. A similar conjecture relates amplitudes in self-dual gravity to maximally helicity violating N=8 supergravity amplitudes.Comment: 14 pages, TeX, three figures, two new references adde

Dynamics of deceptive interactions in social networks

In this paper we examine the role of lies in human social relations by implementing some salient characteristics of deceptive interactions into an opinion formation model, so as to describe the dynamical behaviour of a social network more realistically. In this model we take into account such basic properties of social networks as the dynamics of the intensity of interactions, the influence of public opinion, and the fact that in every human interaction it might be convenient to deceive or withhold information depending on the instantaneous situation of each individual in the network. We find that lies shape the topology of social networks, especially the formation of tightly linked, small communities with loose connections between them. We also find that agents with a larger proportion of deceptive interactions are the ones that connect communities of different opinion, and in this sense they have substantial centrality in the network. We then discuss the consequences of these results for the social behaviour of humans and predict the changes that could arise due to a varying tolerance for lies in society.Comment: 17 pages, 8 figures; Supplementary Information (3 pages, 1 figure

Energy analysis of cool, medium, and dark roofs on residential buildings in the U.S.

This study reports an energy analysis of cool, medium, and dark roofs on residential buildings in the U.S. Three analyses were undertaken in this study: energy consumption, economic analysis, and an environmental analysis. The energy consumption reports the electricity and natural gas consumption of the simulations. The economic analysis uses tools such as simple payback period (SPP) and net present value (NPV) to determine the profitability of the cool roof and the medium roof. The variable change for each simulation model was the roof color. The default color was a dark roof and the results were focused on the changes produced by the cool roof and the medium roof. The environmental analysis uses CO2 emissions to assess the environmental impact of the cool roof and the medium roof. The analysis uses the U.S. Department of Energy (DOE) EnergyPlus software to produce simulations of a typical, two-story residential home in the U.S. The building details of the typical, two-story U.S. residential home and the International Energy Conservation Code (IECC) building code standards used are discussed in this study. This study indicates that, when material and labor costs are assessed, the cool roof and the medium roof do not yield a SPP less than 10 years. Furthermore, the NPV results assess that neither the cool roof nor the medium roof are a profitable investment in any climate zone in the U.S. The environmental analysis demonstrates that both the cool roof and the medium roof have a positive impact in warmer climates by reducing the CO2 emissions as much as 264 kg and 129 kg, respectively

Depth Preferences of Sturgeon In Critical Habitat

The depth and vertical movements of Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) and shortnose sturgeon (Acispenser brevirostrum) at Bucks Ledge (river kilometer 21) in the Penobscot River were examined to investigate sturgeon depth preferences and jumping habits. The purpose of this project was to expand knowledge on the endangered and threatened sturgeon populations in Maine waters. Behavior of 20 individual sturgeon (6 Atlantic sturgeon and 14 shortnose sturgeon) was used to characterize fish depth as it varied with water depth, e.g., in relation to tidal periodicity or not (random). The study used depth data collected using acoustic telemetry between 2007 and 2014. A receiver on the bottom of the river recorded depth from fish tagged with acoustic transmitters and pressure sensors. Many of the recorded depths of all six Atlantic sturgeon and 11 of the 14 shortnose sturgeon fluctuated with the tide (tidal behavior), meaning they remained at the bottom of the water column, throughout multiple tides; on average, the proportion of the time the fish spent at Bucks Ledge doing tidal behavior ranged from 0.16 to 0.52 per season. There was a great deal of variability, with standard deviations ranging from 0.08 to 0.2, but depth observations of Atlantic sturgeon had more tidal periodicity while shortnose sturgeon depths were more random. Atlantic sturgeon also spent more time at Bucks Ledge than shortnose sturgeon did during the days they were present in this area. There were minimal seasonal differences in depth use for both species. Recorded depths of less than 0.5 meters were assumed to be jumping points. There were 14 sturgeons with depths of less than 0.5 meters, for a total of 33 data points. The majority, 73%, of the jumping points occurred during the flood tide, and 67% of jumping points occurred within three hours of low tide. These results indicate sturgeon may jump more commonly at certain stages of the tidal cycle, suggesting a link between gas bladder function and sturgeon jumping

A Business Plan for a Case Management and Home Health Agency

This thesis will focus on the changes in health care delivery in the United States and how case management and home health care agencies have impacted upon it. The quality and cost-effectiveness of case management and home health care delivery will also be explored. As we approach the twenty-first century, the focus of health care delivery is changing rapidly. The health care delivery system has undergone major changes and has had a tremendous impact on the development of case management and home health care agencies. These changes are affecting, and will affect health care consumers and the delivery of home care services. ln general, research attributes those changes as including: the evolution of rapidly advancing technology, scientific breakthroughs, the implementation of governmentally-imposed policies, changes in the economy, and altered lifestyles of health care consumers. In addition, research has indicated that there is a significant rise in the costs of health care today. Because of the multitudinous changes within our health care delivery system and the rising costs of health care, enormous interest has been created. Health care professionals, tl1e federal government, insurance companies, and consumers are primarily interested in the establishment of comprehensive programs and methods designed to facilitate the improved delivery of cost-effective health care. The quest for finding solutions to the delivery of quality health care while simultaneously containing cost has also extended to Wall Street investors, independent providers, and health care consumers. Similarly, health care consumers are searching for new alternatives for regaining, restoring and maintaining health, or minimizing the effects of illness. Based upon research and consumer health needs, the necessity becomes evident of: developing a structural and educational framework for establishing a case management and home health care agency; designing programs to target special health problems and high risk populations; discussing the elements of program or service expenses which can be considered; illustration of the magnitude of cost savings which can be achieved; provision of an ongoing system for monitoring the economic and quality impacts of a case management and home health care agency; and, the offering of a methodology for reproducing the cost savings data in other case management and home care settings. The purpose of this study is to develop a business plan for a case management and home health care agency positioned within a large city in a metropolitan area. It is anticipated that the business plan will illustrate the requirements for operating a case management and home health care agency while epitomizing quality, cost-effective health care services. Journal articles and published studies were the primary source of secondary data. Guidelines from the United States Small Business Administration and Missouri Department of Home Health Licensing and Certification requirements were utilized. It is hoped that those who utilize the case management and home health care agency will benefit from its services

EFFICIENT ANALYTIC COMPUTATION OF HIGHER-ORDER QCD AMPLITUDES

We review techniques simplifying the analytic calculation of one-loop QCD amplitudes with many external legs, for use in next-to-leading-order corrections to multi-jet processes. Particularly useful are the constraints imposed by perturbative unitarity, collinear singularities and a supersymmetry-inspired organization of helicity amplitudes. Certain sequences of one-loop helicity amplitudes with an arbitrary number of external gluons have been obtained using these constraints.Comment: Talk given at Beyond the Standard Model IV, December 13-18 1994, Lake Tahoe, CA. Latex, 4 pages, no figures