Evaluating the economic feasibility of thermal screens in New Zealand using a mathematical model : a thesis presented in partial fulfilment of requirements for the degree of Master of Horticultural Science in Horticultural Engineering at Massey University

A mathematical model of the greenhouse environment was developed to ascertain the annual savings in heating expenditure achieved by thermal screens. Thirteen materials with thermal screening potential were investigated. Each material was modelled within glass, Agphane, and twin skin Agphane covered greenhouses, 300m2 and 1000m2 in floor area, heated with diesel, coal, electricity, natural gas, or L.P.G., to set points of 15°C and 20°C, in Auckland and Christchurch. The model consisted of two phases. Phase 1 was a steady state model of the greenhouse environment based on a series of energy and mass balances. The temperatures within the greenhouse and the quantity of heat required to hold the house at a specified set point were predicted by solving these balances simultaneously. This process enabled the average U-value for each greenhouse to be estimated. In Phase 2 of the model the annual heat load for combinations of each house size and type, cover, screen, set point, and location were estimated using average U-values from Phase 1 and meterological data indicative of Auckland and Christchurch. Using current fuel prices, annual heat loads were converted into annual heating expenditures. Using annual heating expenditure, screen life expectancy, and screen installation cost an economic analysis was conducted using internal rate of return as a measure of thermal screen feasibility. In terms of savings in heating expenditure, Black Polythene, Infrane, and Clear Polythene recorded the highest internal rate of return. It was decided that before a formal recommendation could be made further research was required to evaluate screens as summer shading or photoperiod control devices and to consider the practical problems associated with some of the screens. It was shown that returns from thermal screening were greater in Christchurch than Auckland, greater at a 20°C set point than at a 15°C set point, greater for a 1000m2 house than a 300m2 house, greatest with diesel heating in Auckland, and greatest with diesel and L.P.G. heating in Christchurch

How do American\u27s think about the enviornment and what does it mean for public policy: A re-assessment

Research within the social sciences has attempted to explain what individuals perceive, why they perceive it the way that they do and what are their attitudes, intentions and behavior. This issue is at the root of the contention that surrounds many environmental issues, with individuals worrying about some risks that dramatically exceed the danger they actually pose while ignoring others. Moreover, this fact of the non-rational element in policy decision-making has led researchers to study how to effectively communicate with a public that is emotionally driven. Using the 2010 General Social Survey, this paper attempts to re-assess the bases of environmental concern and why it matters for public policy. This paper highlights the significance of social psychological factors in influencing environmental attitudes, intentions and behavior and how policy decision makers can benefit through a localized discourse when communicating risks or formulating public policy

Changing Participation in Food Assistance Programs Among Low-Income Children After Welfare Reform

In 1996, the safety net for poor households with children fundamentally changed when Federal legislation replaced Aid to Families with Dependent Children (AFDC) with Temporary Assistance for Needy Families (TANF). This study investigates participation in, and benefits received from, AFDC/TANF and food assistance programs, before and after the legislation, for children in low-income households (income below 300 percent of the Federal poverty line). The results show that, between 1990 and 2004, the share of children receiving food stamp benefits declined, most notably among children in the poorest households (income below 50 percent of the Federal poverty line). The share of children receiving benefits from the school meals programs and the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) rose, mainly among children in low-income households with income above the Federal poverty line. Overall, the share of children in households that received benefits from AFDC/TANF or food assistance programs grew from 35 percent to 52 percent. However, the net result of these changes is that average total inflation-adjusted household benefits from all programs examined declined. The decline was largest among children in the poorest households.Food Stamp Program, SNAP, food assistance, welfare reform, WIC, school meals, National School Lunch Program, School Breakfast Program, TANF, AFDC, multiple program use, Survey of Income and Program Participation, Public Economics,

Calendar.help: Designing a Workflow-Based Scheduling Agent with Humans in the Loop

Although information workers may complain about meetings, they are an essential part of their work life. Consequently, busy people spend a significant amount of time scheduling meetings. We present Calendar.help, a system that provides fast, efficient scheduling through structured workflows. Users interact with the system via email, delegating their scheduling needs to the system as if it were a human personal assistant. Common scheduling scenarios are broken down using well-defined workflows and completed as a series of microtasks that are automated when possible and executed by a human otherwise. Unusual scenarios fall back to a trained human assistant who executes them as unstructured macrotasks. We describe the iterative approach we used to develop Calendar.help, and share the lessons learned from scheduling thousands of meetings during a year of real-world deployments. Our findings provide insight into how complex information tasks can be broken down into repeatable components that can be executed efficiently to improve productivity.Comment: 10 page

Anti-Hispanic prejudice drives opposition to immigration in the U.S.

Last June, the U.S. Senate passed a comprehensive immigration bill that would give legal status to 11 million undocumented migrants, but this bill has remained stalled in the House of Representatives, reflecting the anti-immigration sentiments of many Americans. New research from Todd K. Hartman, Benjamin J. Newman, and C. Scott Bell investigates why so many are against immigration reform, and the role played by racial prejudice against Hispanics. Using surveys designed to detect anti-Hispanic prejudice, they find that white Americans react very differently to law-violating behaviors whether they are committed by Hispanic immigrants or not, suggesting a significant and persistent bias against them

Ionizing wave via high-power HF acceleration

Recent ionospheric modification experiments with the 3.6 MW transmitter at the High Frequency Active Auroral Research Program (HAARP) facility in Alaska led to discovery of artificial ionization descending from the nominal interaction altitude in the background F-region ionosphere by ~60 km. This paper presents a physical model of an ionizing wavefront created by suprathermal electrons accelerated by the HF-excited plasma turbulence

Bridging Science with Society: Defining Pathways for Engagement

Science communication training organizations, are uniquely positioned at the nexus of science and society. Through research and training, they empower scientists to engage with the public to ultimately improve how science informs decision-making processes at the individual, organizational, and community levels. This paper argues that science communication training organizations must unite to provide a comprehensive and exhaustive set of offerings that empower scientists to master foundational communication skills while recognizing the complete social and cultural systems in which their science communication occurs. We present three separate possible pathways training programs could take, depending on the contexts and audiences for engagement. We differentiate between the goals, sites, and audiences for engagement, and the forms of knowledge or preparation needed for productive engagement