Sources,sinks, and fluxes of nutrients (N + P) in a small highly modified urban estuary in southern California

Our objective was to begin to investigate sources, sinks, and flux rates of nitrogen (N) and phosphorus (P) in Famosa Slough, a small (12 ha) highly modified urban estuary in San Diego, California, U.S.A. The hydrology of Famosa Slough has been modified by culverts that dampen tidal influence and seasonal runoff from two urban watersheds, each of which has been implicated as a nutrient source that generates nuisance algal blooms. In 1995 and 1996, the ranges of nutrients measured in the water column were extremely wide; upper values exceeded those in other estuaries identified as eutrophic. Average dissolved inorganic nitrogen ranged from 2 to 250 M, while dissolved inorganic phosphorus ranged from <1 to 15 M. Nutrient content of the water changed rapidly both spatially and temporally depending on the tides and rainfall. While tidal water dominated this system, especially in the dry season, our results indicate that Famosa Slough's small watershed, not the larger watershed of the San Diego River, was the major source of nutrients during rainfall. Sediment nutrients were also high (3 mg N g dry wt^–1 and 0.600 mg P g dry wt^–1). Short-term flux studies suggest that the large accumulations of opportunistic green macroalgae commonly found in this estuary, and possibly the sediments, may act as a large and rapid sink for nutrients during times of high nutrient supply. We suggest that small, shallow estuaries in urban settings may have more complex and rapid nutrient dynamics than those found in larger systems.     

The effects of target attractiveness on men's sexual arousal in response to erotic auditory stimuli

Previous research on sexual arousal resulting from auditory stimuli indicates that visual imagery acts as a mediator between stimulus input and resulting arousal. This leads to the question of whether imagery, and subsequent arousal, can be manipulated by providing differing information to hold in semantic memory. This research hypothesizes that attractive images held within semantic memory and pattern-matched with an erotic auditory stimulus facilitate higher self-reported arousal, and at a more rapid rate, than unattractive images. Participants in an "Unattractive" condition experienced slower rates and lower mean levels of arousal in response to an auditory stimulus, compared to participants in an "Attractive" or "No Picture" condition. No differences existed between groups in maximum arousal scores or the tendency to visualize the target during the listening task. Implications for the role of imagery in sexual response, possible measurement issues, and suggestions for future research are addressed in the discussion.     

Stop Making Sense! Erfolgreiche Teamkooperation in globalen Kontexten

With the ongoing globalization process and hierarchical organizations being extended by network oriented principles of governance, the effective team cooperation becomes a success criterion for the management of complex organizations. Group dynamics and organizational theory establish well known variables that have to be addressed for assuring the performance and effectiveness of team work. This article extends these findings by a focused analysis of characteristics of multinational teams. Moreover, success criteria for uncovering the available potential within international teams are explored. On the basis of ethnologic and system-theoretically considerations, the current status quo concerning the manifold integration efforts (such as the prevalent team building programs) will fundamentally be questioned as well as alternatives developed. Finally, the risks and opportunities of a difference oriented mindset will be illustrated on the basis of a concrete and practical example.     

Rethinking the Significance of Attitudes in Preventing Men's Violence Against Women

The concept of attitudes has been an important component of campaigns to address men's violence against women. Attitudes have been examined in relation to men's perpetration of violence, women's experience of violence and community and institutional responses. In this article we argue that there has not been sufficient interrogation of the limitations of attitudes in understanding and addressing men's violence. We propose a social constructionist approach to attitudes and emphasise the need to locate attitudes within the context of familial, organisational, community and social norms which support violence against women. Furthermore, we argue that to prevent violence against women, we must develop interventions beyond cultural and attitudinal change to encompass changes in structural relations and social practices.     

An experimental investigation of violations of transitivity in choice under uncertainty

Several models of decision-making imply systematic violations of transitivity of preference. Our experiments explored whether people show patterns of intransitivity predicted by regret theory and majority rule. To distinguish “true” violations from those produced by “error,” a model was fit in which each choice can have a different error rate and each person can have a different pattern of true preferences that need not be transitive. Error rate for a choice is estimated from preference reversals between repeated presentations of that same choice. Our results showed that very few people repeated intransitive patterns. We can retain the hypothesis that transitivity best describes the data of the vast majority of participants.

Tests for Unit Roots and the Initial Condition

The paper analyzes the impact of the initial condition on the problem of testing for unit roots. To this end, we derive a family of optimal tests that maximize a weighted average power criterion with respect to the initial condition. We then investigate the relationship of this optimal family to popular tests. We find that many unit root tests are closely related to specific members of the optimal family, but the corresponding members employ very different weightings for the initial condition. The popular Dickey‐Fuller tests, for instance, put a large weight on extreme deviations of the initial observation from the deterministic component, whereas other popular tests put more weight on moderate deviations. Since the power of unit root tests varies dramatically with the initial condition, this paper explains the results of comparative power studies of unit root tests. The results allow a much deeper understanding of the merits of particular tests in specific circumstances, and a guide to choosing which statistics to use in practice.     

Turning bad into good: How resilience resources protect organizations from demanding work environments

An organization’s survival and its performance are often connected to employees’ well-being, which in intensive work conditions can be compromised by employee exhaustion. To date, the last economic crisis has forced several companies to downsize and leave the remaining employees facing higher job demands and vulnerability toward job exhaustion. The present study investigates whether resilience together with other personal resources can function as a psychological shield through a mediation and/or moderation process that mitigate the emergence of burnout. Based on a sample of employees from three different Italian companies (N?=?208), our results confirmed that “resilience resources” (i.e., resilience, self-efficacy, self-regulation) mediated the relationship between job demands, exhaustion, and task performance (i.e., energetic process). These results suggest that organizational environments characterized by challenging demands are likely to foster the development of resilience resources to cope with the emergence of potentially harming processes.     

Testing independence conditions in the presence of errors and splitting effects

This paper presents experimental tests of several independence conditions implied by expected utility and alternative models. We perform repeated choice experiments and fit an error model that allows us to discriminate between true violations of independence and those that can be attributed to errors. In order to investigate the role of event splitting effects, we present each choice problem not only in coalesced form (as in many previous studies) but also in split forms. It turns out previously reported violations of independence and splitting effects remain significant even when controlling for errors. However, splitting effects have a substantial influence on tests of independence conditions. When choices are presented in canonical split form, in which probabilities on corresponding probability-consequence ranked branches are equal, violations of the properties tested could be reduced to insignificance or even reversed.     

Testing exchangeability of copulas in arbitrary dimension

A test for exchangeability of copulas for arbitrary dimensions is proposed, generalising and extending a result by Genest et al. [(2012), ‘Tests of Symmetry for Bivariate Copulas’, Annals of the Institute of Statistical Mathematics, 64, 811–834]. Three test statistics together with some modifications are presented and their asymptotical behaviour is analysed. Empirical p-values are computed by using a bootstrap-procedure proposed by Rémillard and Scaillet [(2009), ‘Testing for Equality between Two Copulas’, Journal of Multivariate Analysis, 100, 377–386] and suggested by Bücher and Dette [(2010), ‘A Note on Bootstrap Approximations for the Empirical Copula Process’, Statistics & Probability Letters, 80, 1925–1932], based on a multiplier central limit theorem by van der Vaart and Wellner [(1996), Weak Convergence and Empirical Processes, Springer Series in Statistics, New York: Springer]. Finally a simulation study compares various versions of the proposed tests.     

Bayesian nonparametric statistics: A new toolkit for discovery in cancer research

Many commonly used statistical methods for data analysis or clinical trial design rely on incorrect assumptions or assume an over‐simplified framework that ignores important information. Such statistical practices may lead to incorrect conclusions about treatment effects or clinical trial designs that are impractical or that do not accurately reflect the investigator's goals. Bayesian nonparametric (BNP) models and methods are a very flexible new class of statistical tools that can overcome such limitations. This is because BNP models can accurately approximate any distribution or function and can accommodate a broad range of statistical problems, including density estimation, regression, survival analysis, graphical modeling, neural networks, classification, clustering, population models, forecasting and prediction, spatiotemporal models, and causal inference. This paper describes 3 illustrative applications of BNP methods, including a randomized clinical trial to compare treatments for intraoperative air leaks after pulmonary resection, estimating survival time with different multi‐stage chemotherapy regimes for acute leukemia, and evaluating joint effects of targeted treatment and an intermediate biological outcome on progression‐free survival time in prostate cancer.