Thirty-three Years of Regulating Fire Protection at Commercial U.S. Nuclear Power Plants: Dousing the Flames of Controversy**

This article focuses on what have been, and may continue to be, the more controversial aspects of fires at commercial nuclear power plants regulated by the U.S. Nuclear Regulatory Commission. Examining what has transpired in fire protection regulation since the 1975 fire at Browns Ferry Unit 1, which first focused attention on the potential hazard of fire at commercial nuclear power plants, we offer a personal perspective as to whether or not the “the flames of controversy” have been “doused.” We show that significant progress has been made while speculating whether these “flames” may ever truly be extinguished, or only kept under control. No core damage accident has ever occurred at a commercial nuclear power plant due to fire.

An Artificial Neural-network Based Predictive Model for Pre-evacuation Human Response in Domestic Building Fire

The post-1993 WTC attack study (Proulx and Fahy, In: Proceedings of ASIAFLAM’95—An International Conference on Fire Science and Engineering, Hong Kong, 1995, pp 199–210) revealed that occupants took 1–3 h to leave the 110-storey buildings, and the pre-movement reactions could account for over two-thirds of the overall evacuation time. This indicates that a thorough understanding of the pre-evacuation behavioral response of people under fire situations is of prime importance to fire safety design in buildings, especially for complex and ultra high-rise buildings. In view of the stochastic (the positions of the occupants) and fuzzy (uncertainty) nature of human behavior (Fraser-Mitchell, Fire Mater 23:349–355, 1999), conventional linear and polynomial predictive methods may not satisfactorily predict the people’s response. An alternative approach, Adaptive Network based Fuzzy Inference System (ANFIS), is proposed to predict the pre-evacuation behavior of peoples, which is an artificial neural network (ANN) based predictive model and integrates fuzzy logic (if-then rules) and neural network (based on back propagation learning procedures The ANFIS learning architecture can be trained by structured human behavioral data, and different fuzzy human decision rules. The applicability in simulating human behavior in fire is worth exploring.

Performing the Primitive in the Postcolony: Nyoni’s Kraal in Cape Town

The production of particular spaces for tourist consumption of the “exotic” other involves the performance of particular conceptualizations of people and places that recreates theatrical versions of the primitive. Through analysis of one such space—Nyoni’s Kraal in Cape Town—we contend that both hosts and visitors are complicit in the construction of these spaces and imaginaries. To this end, practices of social and spatial policing as well as performativity and representations of cultural constructs of an “authentic Africa” are deployed in the projection of a specific form of constructed, “benign” multiculturalism. We contend that such practices reproduce a mythical idyll of Africa for consumption that recreates—rather than questions—colonial power structures, and therefore remain imbued with the inequitable and uncertain outcomes of modernity.

Steering local housing production: evaluating the performance of governance structures

This paper presents an analytical framework that allows us to evaluate the performance of dynamic governance structures. In housing development processes, governance structures—markets, hierarchies and network or relational structures—change as the process proceeds, and so do the goals that are set by all stakeholders, including local authorities. A framework for evaluation is set out that takes account of this temporal component. It is applied empirically to three case studies in the city of Arnhem (The Netherlands). The paper concludes that the effectiveness of steering housing production by local authorities depends on choosing appropriate governance structures, setting realistic goals, and a local authority that acts accordingly. Many of the choices with regard to goals and governance structures are not made autonomously but are structured by the spatial and institutional context in which they operate. A systematic evaluation of the performance of governance structures, within their context, could improve local government’s capacity to steer housing production.

Urban Policy in Post-Apartheid South Africa: Context,Evolution and Future Directions

Against a backdrop of definitions and conceptual clarifications of the term urban policy, including its expression in the developing world—and Africa, in particular—this paper reviews the trajectory of urban policy in South Africa post-1994 and comments on future directions and plausible scenarios. In a highly specific context-dependent analysis, the paper argues that, in the first 10 years of democracy, we have seen the creation of democratic, integrated development local government, mass delivery of housing and services, a finely crafted array of capital and operating subsidies for delivery to lowincome households, and a number of programmes intended to enhance the capacity of local government to undertake delivery. All of these have been centrally driven. The counterpoint to the national perspective and frameworks, the paper argues—and in evidence over the past 5 years, in particular—is the increasingly robust role and influence of cities in setting the urban agenda and, in effect, leading urban policy. The paper concludes by examining the many points that contribute to this view.

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Evaluation of Surfactant Enhanced Water Mist Performance

Water-mist technology provides efficient fire suppression for compartments while minimizing water usage. Even with the many advantages of water mist systems, there is still room for improvement. Water mist systems have demonstrated effectiveness at suppressing flammable liquids (Class B) fires in compartments. However, an especially challenging fire suppression scenario for water mist systems is the small Class B fire. This scenario is often realized after a large fire has been reduced in size or ‘controlled’ by water mist. The small fire scenario is challenging because a small fire may not be able to generate enough vaporized water to displace sufficient oxygen for complete extinction. It should also be noted that even if the Class B fire is extinguished with a water mist system, re-ignition from the hot surrounding surfaces may occur at any time. In the present work, an additive is introduced into the water supply and its effect on the water mist suppression performance is studied. This Forafac^TM additive is a specific formulation, which includes fluorinated surfactants for creating a robust fire suppression foam. The enhanced suppressant exiting the mist nozzle is dispersed in the form of small droplets (not as a continuous foam) similar to a pure water mist spray. However, these droplets create a foam blanket on the surface of the fire, which acts to isolate the fuel from the air. With this formulation, the efficiency of the water mist system is improved even on small fires and most importantly the re-ignition of class B fires is prevented.

Adolescents in the City: Material and Social Living Conditions in Johannesburg–Soweto, South Africa

Urban populations are growing rapidly in developing countries. As a result, challenges to the well-being of adolescents are increasing in priority. This paper describes the material and social living conditions of 5,367 young adolescents, in Johannesburg–Soweto, South Africa in 2002–2003. The majority of children in South Africa’s urban hub have adequate access to basic services. However, social conditions are a key concern—lack of financial support by parents; defaulting caregiver roles to grandparents; minimal or no contact with fathers; and poor school performance. Weakened levels of family support in urban environments may negatively impact on adolescent development. In the long term, family systems as well as other social networks and institutions need to be strengthened to improve adolescent outcomes.

Fire Dynamics Simulator (Version 4.0) Simulation for Tunnel Fire Scenarios with Forced,Transient, Longitudinal Ventilation Flows

In this study, a series of sensitivity analyses were conducted to evaluate a computational fluid dynamic (CFD) model, Fire Dynamics Simulator (FDS) version 4.0, for tunnel fire simulations. A tunnel fire test with a fire size on the order of a 100 MW with forced, time-varying longitudinal ventilation was chosen from the Memorial Tunnel Ventilation Test Program (MTVTP) after considering recent tunnel fire accidents and the use of CFD models in practice. A careful study of grid size and parameters used in the Large Eddy Simulation (LES) turbulence model—turbulent Prandtl number, turbulent Schmidt number, and Smagorinsky constant—was conducted. More detailed analyses were performed to refine the smoke layer prediction of FDS, especially on backflow (i.e., a reversed smoke flow near the ceiling). Also, energy conservation was checked for this scenario in FDS. A simple guideline is given for smoke layer simulations using FDS for similar tunnel fire scenarios.     

Urban growth effects on rural population, export and service employment: evidence from eastern France

This paper examines how the spatial pattern of urban growth in functional economic regions influences the interplay of rural export employment, rural services employment, and population change in rural areas. Using an extension of the Boarnet’s model (Papers in Regional Science 73:135–153, 1994), we find that urban spread effects to rural areas in France are more likely than urban backwash effects, and that spatial urban (both dynamic and static) externalities affect rural population and employment growth. In the functional economic regions where the urban core is declining and the urban fringe is expanding, urban population growth involves an increase in rural export employment, and larger change in service employment favors rural population growth. However, urban export job growth reduces the growth in rural service jobs and expanding urban service jobs reduce rural export jobs, suggesting that expanding urban employment opportunities draws employees away from proximate rural communities. Conversely, where both urban core and fringe are growing, we observe an urban spread effect from the urban export sector to rural services—an export base multiplier effect with a spatial dimension—and from urban population growth to rural service employment.

Comparison of the Effectiveness of Different Fire Notification Signals in Sleeping Older Adults

No previous research has investigated the responsiveness of older adults (65–85 years) to different emergency fire signals during sleep. In this study the auditory arousal thresholds (AAT) of 45 older adults were compared across four signals; the high pitched T-3 (as in current US smoke alarms), a mixed frequency T-3 (500–2500 Hz), a 500 Hz T-3 and a male voice. Participants were carefully screened, including for hearing, and awoken from deep sleep in a repeated measures design. Sounds increased progressively in volume until awakening occurred. It was found that the median AAT for the most effective signal, the mixed frequency T-3, was 20 dBA lower than the median AAT of the least effective signal, the current US high frequency smoke alarm signal. This finding is consistent with previous research, where the high pitched signal required a significantly louder volume than alternatives to wake sleepers of different ages, including children. Those aged over 75 years are especially at risk for sleeping through high pitched signals, probably due to the normal age-related decline in the ability to hear high pitched sounds. The minimum pillow volume of 75 dBA is inadequate for those over 75 years if a 3000 Hz notification signal is used. It is recommended that the high frequency signal currently found in smoke alarms be replaced by an alternative signal that performs significantly better in awakening most of the adult population, once the nature of the best signal has been determined.

Quasi-marketising access to social housing in Britain: assessing the distributional impacts

Since 2000 growing numbers of British social landlords have emulated their Dutch counterparts by introducing a ‘quasi-market’ approach to letting vacant properties. Known in Britain as choice-based lettings (CBL), the new approach aspires to treat people seeking social housing as consumers and to encourage consumerist behaviour. This is consistent with a wider drive for UK welfare state reforms emphasizing ‘customer choice’. As in other policy areas (e.g., education and health) the widening of service-user choice in this area has given rise to concerns that a more market-like system could be to the detriment of already disadvantaged groups. In the CBL case, particular concerns have been expressed about the possible consequences for formerly homeless households. It has also been suggested that, in shifting responsibility for decisions on matching properties and people from landlords to house-seekers themselves, CBL might exacerbate ethnic segregation. Drawing on a government-commissioned study focusing on early CBL schemes in England and Scotland, this paper examines these hypotheses in the light of empirical evidence. The analysis finds no indication that formerly homeless households tend to be disadvantaged under CBL in terms of area popularity or property quality. And, in general, the system appears to produce a more spatially dispersed—rather than a more concentrated—pattern of lettings to ethnic minority households.

Public Perceptions of High-rise Building Emergency Evacuation Preparedness

In light of the events of September 11, 2001, a concern in the fire safety community is that the public attitudes toward emergency evacuation procedures and preparedness may have changed and that current assumptions about occupant behavior may no longer be valid. In 2006, a survey of high-rise building occupants was conducted to explore their knowledge of high-rise building safety and emergency evacuation procedures and their attitudes and perceptions about high-rise safety and emergency evacuation procedures. Some 244 residential building occupants in Chicago, New York City and San Francisco and 228 commercial building occupants in Boston, Chicago, Detroit, Houston, Los Angeles, Miami, and Philadelphia were surveyed. The study revealed that the events of September 11, 2001 have heightened occupants concerns about safety in high-rise buildings. Eight in ten commercial building respondents participated in a fire drill in the last year, compared to 18% of residential building respondents. Among both survey respondents, the most frequent top-of-mind suggestion to building management to improve safety was “more fire drills.” Almost all occupants know where the fire exits are. And, keeping with conventional wisdom, most occupants believe using elevators is unsafe during a fire, however, 28% also believe that going to the roof is a possible alternative to using the stairs. These findings support the need for continued public education about emergency evacuations procedures in high-rise buildings.

The economic rationale for integrated tariffs in local public transport

In this paper, it is shown that integrated tariffs can be used to extract the consumer’s surplus when there are a lot of connections supplied so that the law of large numbers applies in the estimation of the consumer’s willingness to pay. The time validity limitations of tickets are explained by a nonlinear pricing approach. Links between optimal pricing in local public transport and network characteristics are highlighted.

大空间烟气控制性能化设计影响因素模拟

利用FDS数值模拟大空间烟气流动情况,探讨大空间火灾烟气控制系统性能化设计中的影响因素.针对设计火灾荷栽、火源位僵、大空间的形状系数和大空间体积对烟气层高度和烟气温度的影响进行模拟分析,对大空间火灾烟气控制系统的性能化设计具有重要意义.     

Housing and home-making in low-income urban settlements: Sri Lanka and Colombia

Enabling the making of home is central to the practices of housing, but constructing home is more than building adequate shelter. It is about establishing, nurturing and managing social relationships and bringing together spaces, objects and elements to represent and celebrate desired relationships, events and memories. Drawing on empirical data from Sri Lanka and Colombia, this paper examines in detail the practices of home-making in low-income settlements. By focussing on people’s conceptions of home and by identifying key social and societal practices, the paper offers insights into the processes of home-making among ordinary dwellers in developing countries and calls for culturally sensitive and holistic housing interventions which support and complement these processes.

Measuring residential satisfaction: a residential environmental satisfaction scale (RESS)

The aim of this article is to introduce an integrative and more comprehensive approach to measurement of residential environmental satisfaction. Domains of residential environmental satisfaction were empirically examined using techniques for multivariate analysis. Data were mainly drawn from the Housing Demand Survey (WoningBehoefteOnderzoek 2002), an a-select sample of 75,034 respondents that is representative for the population of Dutch residents in 2002. The Housing Demand Survey is one of the most extensive sample surveys in the Netherlands and is held every 4 years. The results of exploratory factor analysis give empirical support for the usefulness of the theoretically proposed three-component model of residential environmental satisfaction. Furthermore, multi-group analysis supports the assumption of similarity of perceived quality of the living situation among people varying in degree of residential environmental satisfaction. Reliability and validity tests confirm that the Residential Environmental Satisfaction Scale-Dutch Language Version (RESS-DLV) is an adequate instrument and that it contributes to the understanding of the perceived quality of the living situation. The measure correlates as expected with various criterion measures. The compact and valid instrument RESS-DLV—and especially its abbreviated version—can be very useful as the dependent or the independent variable variable in research carried out in the Netherlands and other European countries. First pattern detection in satisfaction severity groups indicates that satisfaction with the subdomain ‘residential social climate’ is the most significant component of overall residential satisfaction.

Berlin and Warsaw: in search of a new role in the European urban system

After 1989, the cities of Central and Eastern Europe were engaged in an inter-urban competition, a process characteristic of the urban scene since the beginning of European integration. Being a topic of great interest to researchers, a large body of literature has accumulated on the observed role of capital cities in the region as well as on their potential role in the future. Several researchers have focused on the position as well as the interdependence of Berlin and Warsaw—two urban nodes in what is hypothesized as a future West–East development trajectory (see Domański, 1999). The present paper deals with the emergence and development of metropolitan functions in these two cities. It is based on a comparative research project, which involved a series of structured, in-depth interviews with planners and policy-makers in Germany and Poland conducted by the author during the period 2001–2003. The paper discusses the development factors and their contributions to the metropolitan potential of Berlin and Warsaw. The identification of these factors is a starting point for determining the future position and rank of these two capital cities in the European urban system. The analysis is complemented by a comparison of trends in the employment structure of Berlin and Warsaw during the period 1994–2002. The results allow the author to evaluate some hypotheses posed in strategic planning documents concerning Berlin and Warsaw.

An Experimental Determination of a Real Fire Performance of a Non-Load Bearing Glass Wall Assembly

A glass wall assembly was exposed to an intense real-scale compartment fire. The wall assembly consisted of four glass sections, two of which were fitted with tempered double-pane glass and the other two sections were fitted with tempered single-pane glass. At each glass section, temperatures were measured at the exposed face and the unexposed face. Total heat flux gauges were used to measure both the temporal variation of the energy incident on the glass wall and the transmitted energy rate detected through two of the glass sections. Visual and infrared cameras were used to image the unexposed face of each wall assembly during the fire exposure. Results of glass breakage and subsequent glass fall out were compared to studies in the literature for glass sections exposed to compartment fires. The behavior of the glass wall assembly under a fire load is presented.

Being a Rhythm Analyst in the City of Varanasi

The way in which we perceive various spaces in the city and the way our bodies inhabit them affects the way we conceive the city. Hence, there are links between methods of seeing, inhabiting and representing the city and the manner in which they are designed. Yet, as Lefebvre has suggested, architects and planners have often ignored the way these spaces are read and inhabited or lived. By ignoring the lived aspect of space, the role of the user in constructing and representing or mapping the city space is completely overlooked. This article discusses rhythm analysis as a technique for constructing experiential maps by using a case study of Varanasi, which is an Indian city seeped in traditions and where one can find an intense relationship between user’s body, space and its representation.