Relationships among nutrients,chloride and biological indices in urban Maryland streams

Using a spatially extensive urban database constructed from the Maryland Biological Stream Survey (MBSS), we describe the relationships of nutrients in small-order streams to eight defined categories of percent catchment urbanization, correlations between chloride and conductivity in urban streams, and relationships between nutrients and chloride with two Maryland-specific indices of biotic integrity for benthic macroinvertebrates and fish assemblages. Stream nutrients become elevated with increasing percent catchment urbanization, followed by increases in all four measured nitrogen species and total phosphorus at catchment urbanization levels greater than 10%. There was a strong collinear relationship (r ² = 0.90) between chloride and conductivity (trimeans) across all eight urbanization classes, where Cl (mg/L) = −0.397 + 0.188*conductivity (μS/cm). Critical values for all water quality parameters with the two Maryland biological indices were derived using quantile regression, with significant regressions developed for 11 of 16 water quality parameters and the two biotic indices. For nitrate (NO₃-N), the critical thresholds between fair and poor stream quality for the two Maryland biological indices were 0.83 mg/L (benthic macroinvertebrate assemblages) and 0.86 mg/L (fish assemblages). Increasing stream nutrient and chloride levels, associated with widespread catchment urbanization intensity, now affect many small streams in Maryland, with implications for decreasing water quality in major tributaries and the Chesapeake Bay.     

The social distance perceptions of racial and ethnic groups by college students: A research note

There is growing concern in our society regarding the resurgence of racist movements. There has been increased media coverage of these activities and educators warn that racism is on the rise in our schools and on college campuses. This article examines the similarity of responses of college students of various racial and ethnic groups. The Social Distance Scale was administered to 415 undergraduate students. The research reveals that, overall, most college students would be willing to admit most racial/ethnic groups to their clubs as personal chums or to their streets as neighbors. Iranians were consistently given the greatest distance (to citizenship in my country) by all groups. Implications of this study purport that schools as agents of socialization can expose students to multicultural diversity within an academic setting.     

Probabilistic Reliability Modeling for Oil Exploration & Production (E&P) Facilities in the Tallgrass Prairie Preserve

The aging domestic oil production infrastructure represents a high risk to the environment because of the type of fluids being handled (oil and brine) and the potential for accidental release of these fluids into sensitive ecosystems. Currently, there is not a quantitative risk model directly applicable to onshore oil exploration and production (E&P) facilities. We report on a probabilistic reliability model created for onshore exploration and production (E&P) facilities. Reliability theory, failure modes and effects analysis (FMEA), and event trees were used to develop the model estimates of the failure probability of typical oil production equipment. Monte Carlo simulation was used to translate uncertainty in input parameter values to uncertainty in the model output. The predicted failure rates were calibrated to available failure rate information by adjusting probability density function parameters used as random variates in the Monte Carlo simulations. The mean and standard deviation of normal variate distributions from which the Weibull distribution characteristic life was chosen were used as adjustable parameters in the model calibration. The model was applied to oil production leases in the Tallgrass Prairie Preserve, Oklahoma. We present the estimated failure probability due to the combination of the most significant failure modes associated with each type of equipment (pumps, tanks, and pipes). The results show that the estimated probability of failure for tanks is about the same as that for pipes, but that pumps have much lower failure probability. The model can provide necessary equipment reliability information for proactive risk management at the lease level by providing quantitative information to base allocation of maintenance resources to high-risk equipment that will minimize both lost production and ecosystem damage.     

Myths and Moral Authority in Maluku: The Case of Ambon

Since January 1999, the island of Ambon, located in the province of Maluku (Moluccas) in Eastern Indonesia, has been the scene of a virtual war between Christians and Muslims. Amid its religious underpinnings, two competing nationalistic ideologies have developed, one based on allegiance to an ethnic Moluccan nation and the other to a civic nation of common residence. Attempts to rationalise the underlying sentiment of the masses in these movements have purported rational explanations of the pursuit of common material interests, while others have focused on innate emotions of individual loyalty to their community. The other explanation suggests that identity is constructed as an ideological myth that convinces the individual of the simplicity of otherwise complex situations. In this respect, this paper has focused on the psychological and political appeal of myths of kinship as strengthening ideas of national consciousness and individual loyalty. It is asserted that the construction of new 'us' and 'them' visions of imagined community occur in the context of social, economic and political processes. These disruptive forces place individuals in stress situations and make them susceptible to these ideologies which offer simplistic diagnoses of complex social and political changes.     

Don't Screw the Crew: Exploring the Rules of Engagement in Organizational Romance

Thirty years ago sociological research began to discover what workplace romance might mean for the participants. Since then management research has tended to adopt a functionalist approach, using survey methods, or third‐party approaches to ask about company policy and negative consequences of workplace romance, warning of the dangers and consequences of romance and offering solutions for managers on how to deal with this potential problem. Drawing on the sexuality of organization and critical literature, and adopting a position of constructivist structuralism with a qualitative research method, this research looks at how the concept of workplace romance is defined and negotiated within a public‐house setting. It examines the ‘rules of engagement’, the personal experiences and views of both managers and workers, as well as first‐hand stories of workplace romance. Romance was conceptualized as ‘natural’ and something that could not be legislated for, where unwritten rules were defined but often ignored. However, the ‘rules of engagement’ emerged as favouring particular groups depending on gender, position in the hierarchy and sexual identity. Subjective value judgements are made, often resting on gendered assumptions of male and female behaviour.     

Tort claims for road accident compensation and social security in South Africa

The statutory scheme of road accident compensation in South Africa encapsulates both the common law of tort or delict and the residue of liability insurance principles. The absence of meaningful interaction between the road accident compensation scheme and the broader social security system raises significant challenges. There are dissonant responses to the targeted misfortune, provision of benefits, financing, choice of remedies and socioeconomic-political priorities selected by the South African government. It is argued that the current scheme should be identified as falling squarely within a state-funded and regulated scheme of comprehensive social protection.     

The Impact of Candidate Sex on Evaluations of Candidates for the U.S. House of Representatives*

Objectives. To examine how voters and the general public evaluate women candidates by examining ideological and issue‐based evaluations of women candidates for the House of Representatives. Methods. Data are drawn from the National Election Study for all U.S. House elections from 1990 to 2000. OLS and logistic regression models examining the role of candidate sex in evaluations are tested. Results. When evaluating Democratic candidates, people see them as more liberal and utilize more female issues in their evaluations when the candidate is a woman. For Republican candidates, candidate sex is much less likely to be related to how people evaluate them. Conclusion. The central role of party in public evaluations of women candidates suggests that the impact of candidate sex on voters is more complex than previous works have suggested.