U.S. Population, Energy & Climate Change

Explains how U.S. population trends tend to exacerbate both the causes and effects of climate change. Outlines how population density and composition affect energy and land use, the role each U.S. region plays in climate change, and the risks they face

Developing a computer aided design tool for inclusive design

The purpose of this study was to investigate age-related changes in the performance of a range of movement tasks for integration into a computer aided design (CAD) tool for use in inclusive design

Electroweak Precision Observables and the Unhiggs

We compute one-loop corrections to the S and T parameters in the Unhiggs scenario. In that scenario, the Standard Model Higgs is replaced by a non-local object, called the Unhiggs, whose spectral function displays a continuum above the mass gap. The Unhiggs propagator has effectively the same UV properties as the Standard Model Higgs propagator, which implies that loop corrections to the electroweak precision observables are finite and calculable. We show that the Unhiggs is consistent with electroweak precision tests when its mass gap is at the weak scale; in fact, it then mimics a light SM Higgs boson. We also argue that the Unhiggs, while being perfectly visible to electroweak precision observables, is invisible to detection at LEP.Comment: 13 pages; v2: references added, discussion of production cross-section expande

Efectos de una única presentación de un estímulo saliente según un procedimiento estimular o de respuesta, en una tarea de evitación pasiva

El punto de vista tradicional del condicionamiento instrumental mantie- ne que el aprendizaje es imposible si todas las formas de reforzamiento (primarias y secundarias) se demoran por espacio de unos pocos segundos a continuación de una respuesta (por ejemplo, Grice, 1948). Sin embargo, experimentos posteriores (Lett, 1973, 1974, 1975; Lieberman, McIntosh y Thomas, 1979; Thomas, Lieberman, McIntosh y Donaldson, 1983) han demostrado que las ratas pueden aprender discriminaciones espaciales con reforzamiento de comida demorado hasta incluso por un periodo de dos minutos

Social Media and the Internet: A Story of Privatization

This article will question what role private and public actors assume in the current structure of data collection and what potential rights are violated. To tease out the relationship between the private and government sectors, this article, for sake of argument, accepts as fact that surveillance is a core government function and that data is a public resource collected by private organizations. While those assumptions may be challenged by different definitions of what constitutes a public function, public resource, or mode of collection, this article does not take on those challenges. It also does not ask the normative question of whether data collection should cease or the descriptive inquiry of whether data collection could even be halted if the public wanted it to be. Rather, this article simply examines the structure surrounding data collection in terms of privatization, and asks whether certain legal doctrines may be triggered, including the Fourth Amendment. To do so, this article will first set out a definition of a privatization and use the military as an example. In Section II, the article will then engage in a short history of the Internet to show how electronic data collection was a core government function later “privatized” by Silicon Valley corporations. Section III will then explain how this dynamic between private and public oversight raises Fourth Amendment concerns. Finally, the Conclusion will then set out suggestions for the future, including a potential justification for new privacy rights

Lipid Coated Gold Nanoparticle Cores: Synthesis and Characterization

Including environmental, industrial, and biomedical sciences, applications of gold nanoparticles are on the forefront of research in many areas. By altering the surface treatment of spherical gold nanoparticle cores, particularly those smaller than 100 nm (nanometers), one can influence their potential use in a number of ways. Lipid coated nanoparticles with specifically selected surface ligands can be used for multiple biomedical functions, including medical imaging, for use as colorimetric and plasmonic sensors within the body, and as cell or organelle specific targets for therapeutic drug delivery or cancer treatment. Here, spherical gold nanoparticles ranging in size from 8-40 nm (avg. diameter 23-48 nm) have been synthesized and coated with poly(allylamine hydrochloride) (PAH) and a mixed lipid solution of 1:1 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine (POPS) and lysophosphatidylcholine (LPC), two of the four major types of lipids found in the human body. Characterization was performed using a NanoSight LM10HS particle sizer, and shows a gradual increase in size after each step in the coating process for nanoparticle cores ranging in size from 16-27 nm. The thickness of these purified and lipid coated nanoparticles was consistently 2-3 times that of the PAH coated sample it was layered onto, suggesting a successful, multi-layered coat that ranges in size based on the PAH coated core size. UV-Vis spectroscopy shows a slight red shift, indicating an increase in size and change in refractive index, which supports the presence of lipid coating on the PAH coated gold nanoparticle cores

The silent burden of anaemia in Tanzania children:a community-based study

Objective was to document the prevalence, age-distribution, and risk factors for anaemia in Tanzanian children less than 5 years old,thereby assisting in the development of effective strategies for controlling anaemia.\ud \ud Cluster sampling was used to identify 2417 households at random from four contiguous districts in south-eastern\ud United Republic of Tanzania in mid-1999. Data on various social and medical parameters were collected and analysed.\ud \ud Blood haemoglobin concentrations (Hb) were available for 1979 of the 2131 (93%) children identified and ranged from 1.7 to 18.6 g/dl. Overall, 87% (1722) of children had an Hb <11 g/dl, 39% (775) had an Hb <8 g/dl and 3% (65) had an Hb <5 g/dl. The highest prevalence of anaemia of all three levels was in children aged 6–11 months, of whom 10% (22/226) had an Hb <5 g/dl. However, the prevalence of anaemia was already high in children aged 1–5 months (85% had an Hb <11 g/dl, 42% had an Hb <8 g/dl, and 6% had an Hb <5 g/dl). Anaemia was usually asymptomatic and when symptoms arose they were nonspecific and rarely identified as a serious illness by the care provider. A recent history of treatment with antimalarials and iron\ud was rare. Compliance with vaccinations delivered through the Expanded Programme of Immunization (EPI) was 82% and was notassociated with risk of anaemia.\ud \ud Anaemia is extremely common in south-eastern United Republic of Tanzania, even in very young infants. Further implementation of the Integrated Management of Childhood Illness algorithm should improve the case management of anaemia. However, the asymptomatic nature of most episodes of anaemia highlights the need for preventive strategies. The EPI has good coverage of the target population and it may be an appropriate channel for delivering tools for controlling anaemia and malaria