High quality indoor environments for sustainable office buildings

The quality of office indoor environments is considered to consist of those factors that impact occupants according to their health and well-being and (by consequence) their productivity. Indoor Environment Quality (IEQ) can be characterized by four indicators: • Indoor air quality indicators • Thermal comfort indicators • Lighting indicators • Noise indicators. Within each indicator, there are specific metrics that can be utilized in determining an acceptable quality of an indoor environment based on existing knowledge and best practice. Examples of these metrics are: indoor air levels of pollutants or odorants; operative temperature and its control; radiant asymmetry; task lighting; glare; ambient noise. The way in which these metrics impact occupants is not fully understood, especially when multiple metrics may interact in their impacts. While the potential cost of lost productivity from poor IEQ has been estimated to exceed building operation costs, the level of impact and the relative significance of the above four indicators are largely unknown. However, they are key factors in the sustainable operation or refurbishment of office buildings. This paper presents a methodology for assessing indoor environment quality (IEQ) in office buildings, and indicators with related metrics for high performance and occupant comfort. These are intended for integration into the specification of sustainable office buildings as key factors to ensure a high degree of occupant habitability, without this being impaired by other sustainability factors. The assessment methodology was applied in a case study on IEQ in Australia’s first ‘six star’ sustainable office building, Council House 2 (CH2), located in the centre of Melbourne. The CH2 building was designed and built with specific focus on sustainability and the provision of a high quality indoor environment for occupants. Actual IEQ performance was assessed in this study by field assessment after construction and occupancy. For comparison, the methodology was applied to a 30 year old conventional building adjacent to CH2 which housed the same or similar occupants and activities. The impact of IEQ on occupant productivity will be reported in a separate future pape

Aerodynamic Response of a Hovering Rotor to Ramp Changes in Pitch Input

Under transient conditions, a helicopter rotor generates a complex, time-dependent pattern of shed and trailed vorticity in its wake that has profound eects on its loading. To examine these eects, the response of a two-bladed hovering rotor to a ramp change in collective pitch is investigated using three dierent computational approaches. Solutions obtained using a Compressible Reynolds Averaged Navier{Stokes ap- proach are compared to results obtained from lifting-line theory coupled to an Eulerian Vorticity Transport Model, and from a simple single-state dynamic in ow model. The dierent numerical approaches yield very similar predictions of the thrust response of the rotor to ramp changes in collective pitch, as long as the ramp rates are small. This suggests that the basic underlying ow physics is properly represented by all the approaches. For more rapid ramp rates, an additional delay in the aerodynamic response of the rotor, that is related to the nite extent of the wake during its early history, is predicted by the Navier{Stokes and Vorticity Transport approaches. Even though the evolution of the wake of the rotor is strongly three dimensional and highly unsteady, the predictions of the Navier{Stokes and lifting-line models agree very closely as long as the blades of the rotor do not stall. In the pre-stall regime, a quasi two-dimensional representation of the blade aerodynamics thus appears adequate for predicting the performance of such systems even under highly transient conditions. When ow separation occurs, the resulting three dimen- sionality of the blade aerodynamics forces the predictions of the Navier{Stokes and lifting-line approaches to diverge, however. The characterization of the wake interactions and stall propagation mechanisms that are presented in this study oers some insight into the fundamental uid dynamic mechanisms that govern the transient aerodynamic response of a rotor to control inputs, and provides some quantication of the limits of applicability of some popular current approaches to rotor aerodynamic analysis

Expectations, reservation wages and employment: Evidence from British panel data

In this paper, we explore the relationship between expectations and reservation wages for a sample of unemployed individuals using panel data drawn from the British Household Panel Survey, 1996 to 2005. To be specific, we initially investigate the determinants of expectations relating to the individual´s financial situation and employment prospects over the next 12 months. Our findings suggest that job search and education are positively associated with financial optimism and confidence regarding future employment prospects. Conversely, the length of time out of employment and age are associated with pessimistic expectations. Propensity score matching techniques enable us to adopt a quasi experimental approach to ascertain how an individual´s expectations regarding their future financial situation as well as expectations regarding securing future employment influence the setting of reservation wages at the individual level. Optimism over future finances and future job prospects are associated with a higher reservation wage in both the matched and unmatched estimates. Furthermore, confidence over securing future employment is associated with a higher probability of actually gaining employment in the next period

Financial Expectations, Consumption and Saving: A Microeconomic Analysis

We explore the determinants of individuals´ financial expectations using data from the British Household Panel Survey (BHPS) 1991-2001. Our findings suggest that individuals´ financial predictions are influenced by both the life cycle and the business cycle. We also investigate the extent to which the accuracy of past financial expectations affects current financial expectations. Interestingly, only past financial optimism matters, regardless of the accuracy of the prediction. We also explore the relationship between financial realisations and expectations and we find that expectations tend to fall short of financial realisations. Finally, we investigate the relationship between financial expectations, savings and consumption. Our findings suggest that financial optimism is inversely associated with savings and that current financial expectations serve to predict future consumption

Social Interaction and Stock Market Participation: Evidence from British Panel Data

This paper uses data from the British National Child Development Study to investigate the relationship between social interaction and participation in the stock market through holding stocks and/or shares at the individual level. In accordance with the existing literature, the results reveal that a positive relationship exists between social interaction and stock market participation, when both are measured concurrently. Furthermore, this relationship prevails across a range of measures of social interaction and social capital. In addition, we make a potentially important contribution to the existing literature by exploiting the panel nature of the data in order to explore the robustness of the cross-sectional findings. We find that the positive relationship between stock market participation and social interaction prevails within a fixed effects logit framework, which controls for time invariant unobserved effects

Social Interaction and Intergenerational Skill Transfer

We explore the relationship between educational attainment and social interaction using individual level data from the British National Child Development Study. To be specific, we analyze whether an intergenerational aspect to this relationship exists by examining the relationship between the educational attainment of children and the degree of formal social activity undertaken by their parents. In accordance with the existing literature, our results support a positive association between education and social interaction. Furthermore, our results suggest that children´s scores in reading, mathematics and vocabulary tests are positively associated with the extent of their parents´ formal social interaction. This relationship is robust to controlling for the degree of intra-family based social interaction and the social activities of the child

Reservation Wages, Expected wages and the duration of Unemployment: evidence from British Panel data

In this paper we analyse the role of wage expectations in an empirical model of incomplete spells of unemployment and reservation wages. To be specific, we model the duration of unemployment, reservation wages and expected wages simultaneously for a sample of individuals who are not in work, where wage expectations are identified via an exogenous policy shock based upon the introduction of Working Family Tax Credits (WFTC) in the UK. The results from the empirical analysis, which is based on the British Household Panel Survey, suggest that WFTC eligibility served to increase expected wages and that expected wages are positively associated with reservation wages. In addition, incorporating wage expectations into the econometric framework was found to influence the magnitude of the key elasticities: namely the elasticity of unemployment duration with respect to the reservation wage and the elasticity of the reservation wage with respect to unemployment duration

Analysis of an effusive sampling device for analysis of boundary layer gases

The effect of suction, through an opening in a surface, upon a stream of flowing gas is determined. The quantity of interest is the maximum distance, Y, from the surface that the main stream is affected by the applied suction. The fraction of this distance Y of the boundary layer thickness sigma is determined as a function of tubing radius and length, gas pressure, temperature and stream velocity. The shape of the flow in the high velocity stream is assumed to be determined by means of a parameter which is an unknown function of the distance from the leading edge of the surface

International labor standards in the world trade organization and the international labor organization

World Trade Organization