Fully Coupled Simulation of the Plasma Liquid Interface and Interfacial Coefficient Effects

There is a growing interest in the study of coupled plasma-liquid systems because of their applications to biomedicine, biological and chemical disinfection, agriculture, and other areas. Without an understanding of the near-surface gas dynamics, modellers are left to make assumptions about the interfacial conditions. For instance it is commonly assumed that the surface loss or sticking coefficient of gas-phase electrons at the interface is equal to 1. In this work we explore the consequences of this assumption and introduce a couple of ways to think about the electron interfacial condition. In one set of simulations we impose a kinetic condition with varying surface loss coefficient on the gas phase interfacial electrons. In a second set of simulations we introduce a Henry's law like condition at the interface in which the gas-phase electron concentration is assumed to be in thermodynamic equilibrium with the liquid-phase electron concentration. It is shown that for a range of electron Henry coefficients spanning a range of known hydrophilic specie Henry coefficients, the gas phase electron density in the anode can vary by orders of magnitude. Varying reflection of electrons by the interface also has consequences for the electron energy profile. This variation in anode electron density and energy as a function of the interface characteristics could also lead to significant variation in near-surface gas chemistries when such reactions are included in the model; this could very well in turn affect the reactive species impinging on the liquid surface. We draw the conclusion that in order to make more confident model predictions about plasma-liquid systems, finer scale simulations and/or new experimental techniques must be used to elucidate the near-surface gas phase electron dynamics

Prevalence, Risk Factors, and Primary Causes of Disability Among Canadian Seniors: An Analysis of the 1986 and 1991 Health and Activity Limitation Surveys

An aging Canadian population highlights the need to examine the prevalence and causes of disabilities in seniors in order to be able to meet their health care needs. This report represents a step in that direction by examining disabilities among Canadian seniors using the 1986 and 1991 Health and Activity Limitation Surveys (HALS), two nation-wide surveys assessing the prevalence and impact of disabilities in the Canadian population. From these two surveys, disabilities among noninstitutionalized seniors, 65 years of age and older, were examined. Findings revealed that over 40% of seniors had at least one disability that impacted on activities of daily living and that one-quarter of disabled seniors were severely disabled. Risk factors that were associated with having a disability included marital status, language spoken, total household income, tenure of dwelling, number of people living in the household, and region of the country. Mobility and agility disabilities were the most common types of disabilities among seniors, with approximately 80% of disabled seniors having at least one mobility or agility disability. Further, mobility and agility disabilities tended to coexist, with approximately 70% of all seniors who had a mobility disability also having an agility disability. Arthritis/rheumatism was the medical condition that most often caused mobility and agility disabilities, followed by cerebrovascular disease, other forms of heart disease, and fractures/bone breaks. Women were more likely than men to have mobility and agility disabilities, with other risk factors associated with having mobility and agility disabilities similar to those for having any disability. The findings of this report indicate that many Canadian seniors suffer from disabilities, particularly disabilities that affect their mobility and agility. Therefore, to have a substantial effect on reducing the impact of disabilities on Canadian seniors, efforts should be directed toward finding effective medical interventions that reduce or control the most common conditions which result in mobility and agility disabilities. Further, finding means to reduce the negative impact that mobility and agility type impairments have on everyday living would serve to help disabled seniors.disability; seniors; HALS

The Construction of a Tax and Expenditure Limitation Index for the US

This report provides detail on the construction of an index of tax and expenditure limitations (TELs) for the 50 US states for the time-frame 1969 to 2005. Separate annual indices are constructed for TELs on state and on local governments. The goal of constructing the indices is to provide a means to test a range of hypotheses concerning the impact of TELs on economic performance and on state and local government fiscal policies. This report documents the construction of the index. The data are provided in Excel spreadsheets so that others may construct alternative indices.

Timing Judicial Review of Agency Interpretations in Chevron\u27s Shadow

The Administrative Procedure Act (APA) permits judicial review of final agency action. Agency action is final when it is both the consummation of the agency\u27s decision making process and a decision by which rights _or obligations have been determined;\u27 or from which legal consequences will flow. Some forms of agency action uncontroversially satisfy both of these conditions for finality. For example, legislative rules promulgated by agencies pursuant to congressional delegations of policy-making authority after a period of public notice and comment are certainly final agency action that can be challenged before their application. Other forms of agency action pose challenges for the finality doctrine. In particular, agencies sometimes issue non­legislative interpretative rules construing arguably ambiguous statutory provisions. While these interpretative rules are often the consummation of an agency\u27s decision-making process, do they determine rights or obligations? Do legal consequences flow from their issuance

Momentum, Heat, and Neutral Mass Transport in Convective Atmospheric Pressure Plasma-Liquid Systems and Implications for Aqueous Targets

There is a growing interest in the study of plasma-liquid interactions with application to biomedicine, chemical disinfection, agriculture, and other fields. This work models the momentum, heat, and neutral species mass transfer between gas and aqueous phases in the context of a streamer discharge; the qualitative conclusions are generally applicable to plasma-liquid systems. The problem domain is discretized using the finite element method. The most interesting and relevant model result for application purposes is the steep gradients in reactive species at the interface. At the center of where the reactive gas stream impinges on the water surface, the aqueous concentrations of OH and ONOOH decrease by roughly 9 and 4 orders of magnitude respectively within 50 $\mu$m of the interface. Recognizing the limited penetration of reactive plasma species into the aqueous phase is critical to discussions about the therapeutic mechanisms for direct plasma treatment of biological solutions. Other interesting results from this study include the presence of a 10 K temperature drop in the gas boundary layer adjacent to the interface that arises from convective cooling and water evaporation. Accounting for the resulting difference between gas and liquid bulk temperatures has a significant impact on reaction kinetics; factor of two changes in terminal aqueous species concentrations like H$_2$O$_2$, NO$_2^-$, and NO$_3^-$ are observed if the effect of evaporative cooling is not included

A comparative analysis of two different analysers used for determination of the Total Organic Carbon in pharmaceutical grade water

Total Organic Carbon (TOC) is a routine test for pharmaceutical grade water. Several manufacturers supply equipment of different designs but there is a dearth of published, peer-reviewed, information evaluating the various analysers. In this study, we compared two TOC analysers, both validated to the same pharmacopoeial criteria, but with different oxidation and detection methods. The results in this paper show that there were no unexplained out-of-specification results and that both analysers operated equivalently in terms of the pharmacopoeial 500ppb pass/fail limits. However, significant differences between the TOC levels reported from paired samples were observed, two paired samples recorded a pass/fail conflict (albeit flagged with an overestimation warning), as well as differences in analyser responses between spiked samples that contained low levels of nitro- and chloro-carbon compounds

Comparative analysis of TOC and conductivity analysers as applied to pharmaceutical water analysis

Pharmaceutical grade water requires the measurement of bioburden, Total Organic Carbon and conductivity. Here we report a comparative analysis from two TOC analysers and two conductivity systems. The TOC analysers showed significantly different results

Sensory Impairments among Canadians 55 years and Older: An Analysis of 1986 and 1991 Health and Activity Limitation Survey

It has been well established that increasing age is associated with worsening health and decreasing functional ability among seniors, including conditions that lead to hearing and seeing impairments. The development of such sensory impairments can lead to a reduced quality of life by interfering with the ability to carry out activities of daily living and engaging in social activities. The review, which precedes the findings of this report, highlights the impact of sensory impairments on seniors (65 years and older) by first describing the prevalence of hearing and seeing impairments in this population and then examining the association between sensory impairment and physical, cognitive, and social functioning.HALS; aging

Prevalence, Risk Factors, and Health Care Utilization for Injuries Among Canadian Seniors: An Analysis of 1994 National Population Health Survey

Despite the impact injuries have on hospitalization and mortality, relatively little research has been conducted examining injuries among seniors that do not require hospitalizations. Additionally, there is a paucity of research on the utilization of health care resources, other than hospitals, by injured older adults. The objective of this study is to examine the prevalence and characteristics of injuries not captured by the hospitalization and mortality data, risk factors associated with such injuries, and health care utilization among Canadian seniors using Statistics Canada's National Population Health Survey (1994). Specifically, this report has the following objectives: 1.To examine the prevalence of injuries among 55-64 year olds and seniors (65+). 2.To identify the causes, types, and locations of injuries. 3.To identify risk factors of injuries. 4.To compare health care use between injured and noninjured people.injuries; seniors; NPHS