An assessment of soil nematode food webs and nutrient pools in community gardens and vacant lots in two post-industrial American cities

In the midst of the current economic crisis, there is renewed interest in transforming vacant lots into food-producing gardens. This study analyzed whether vacant lots are suitable for food production, by comparing the soil nematode food webs and nutrient pools of vacant lots and community gardens in two post-industrial U.S. cities, Akron and Cleveland, Ohio. Twelve vacant lots and 12 community gardens were examined in the two cities. All six Akron community gardens were established just prior to the initiation of this study, whereas the six in Cleveland were 15–30 years old. Soil pH, texture, moisture, organic matter, mineral nitrogen content, microbial biomass, and nematode communities were measured in both cities. Soil decomposition rate was also measured in Cleveland. Results show that the soils of vacant lots surpassed those of the newly-established Akron gardens and were equal to the soils of the well-established Cleveland gardens in the amount of ammonium-nitrogen, total nematode population, genus diversity, and maturity and structure indices. The soils of the vacant lots were lower than the community gardens in the amounts of soil moisture, organic matter, and nitrate-nitrogen, which we associate with the addition of water, compost, fertilizer, and tilling in the gardens. No significant difference was found between community gardens and vacant lots in microbial biomass, decomposition rate, or nematode enrichment index, which seems to indicate that vacant lots are equal to community gardens in nutrient availability and nutrient cycling. We conclude that barring any contamination, the soil in vacant lots maybe suitable for the establishment of food gardens, which can provide many desirable ecosystem services and enhance human well-being. We also find that the disturbance associated with tillage and conversion of a vacant lot into a community garden has short-term ramifications for both nematode food webs and mineral-nitrogen content.     

Patterns of individual change and program satisfaction in a positive parenting program for parents at psychosocial risk

Despite the evidence of effectiveness of positive parenting programs, little is known about the typology of changes that parents at psychosocial risk undergo after an intervention. We compared individual patterns of change in three parenting outcomes in 256 at risk parents with young children attending the group‐based Growing Up Happily in the Family program delivered in municipal social services. We identified four clusters of individual change: Cluster 1 (30.6%) had negative changes in parental child‐rearing attitudes and parenting stress, Cluster 2 (27.7%) had positive changes in child‐rearing attitudes and negative results in parental perceived competence, and Cluster 3 (24.1%) and Cluster 4 (17.6%) showed overall better results. Residential area, type of social support, and quality of implementation characterized cluster membership. Participants in clusters with better results were more satisfied with the program than those with worse results. Practical recommendations are provided for the successful implementation of group parenting programs in family preservation services.     

Effects of various types of change in shift schedules: A controlled longitudinal study

Abstract

Data from a longitudinal study accompanying changes in shift rotas connected with a shortening of working time in the chemical industry are presented. Altogether 260 subjects forming five experimental groups participated in both the pretest and the posttest. The effects of the change in shift schedules were controlled by the inclusion of five groups in which 139 subjects participated in both tests. Five types of change in shift schedule were investigated. The purpose was to determine to what extent similar, but in some aspects differing, types of change in shift schedule varied from one another in their effects on those involved, and on which factors their attitudes towards the new shift systems depended with regard to various types of schedule change. The effects of a change in shift schedule were tested by means of the 4-group investigation design developed by Solomon (1949). The results confirm that differences in the effects of new shift systems depend on the type of change. Only in three experimental groups were improvements in health and social life observed. One experimental group showed significant signs of deterioration in subjective health. In the analyses of the factors influencing the attitude of the shiftworkers towards the new shift system, differences in the structure of the influencing factors between the experimental groups were observed. The causal analysis was used in order to test how important the factors found in each group were and which of them were dominant. It showed that the most influential factors dominated so much that the disturbances in the less influential ones lost their importance. In spite of the number of indicators analysed regarding their influence on attitude in this study, further important factors seem to exist that have not been analysed here.     

Distribution system choice in a service industry: An analysis of international insurance firms operating in the United States

Service firms play an increasingly important role in the global economy. However, the internationalization strategies of such firms, and especially their distribution system choices, have been underexplored in the international management literature. One specific service industry that has internationalized rapidly in recent years is the insurance industry. This paper examines the determinants and performance implications of the choice by international insurance firms between two rival distribution systems: direct writing and independent sales agents. Drawing on the transaction cost theory-based literature on resource commitment, control, and risk, we develop hypotheses on the determinants of the choice between these two distribution systems and on the performance implications of this choice for insurance firms. Analyzing a sample of 168 distribution entries into the United States by insurance firms from six foreign countries over the 1992–2000 period, we find that cultural distance has a U-shaped effect on the probability of direct writing, and that an insurer's intangible assets have a positive effect on this probability. We also find that the direct writing system performs better in terms of profitability, but that the independent agency system performs better in terms of market share growth.     

Non parametric mixture priors based on an exponential random scheme

We propose a general procedure for constructing nonparametric priors for Bayesian inference. Under very general assumptions, the proposed prior selects absolutely continuous distribution functions, hence it can be useful with continuous data. We use the notion ofFeller-type approximation, with a random scheme based on the natural exponential family, in order to construct a large class of distribution functions. We show how one can assign a probability to such a class and discuss the main properties of the proposed prior, namedFeller prior. Feller priors are related to mixture models with unknown number of components or, more generally, to mixtures with unknown weight distribution. Two illustrations relative to the estimation of a density and of a mixing distribution are carried out with respect to well known data-set in order to evaluate the performance of our procedure. Computations are performed using a modified version of an MCMC algorithm which is briefly described.     

Reconceptualising Social Exclusion: A Critical Response to the Neoliberal Welfare Reform Agenda and the Underclass Thesis

The application of free‐market principles to welfare reform in western industrialised nations is underpinned by contentious assumptions about human behaviour. In the postwar era, welfare policies largely considered disadvantage and exclusion as structural problems of the economy and society generally; disadvantaged individuals were considered ‘victims’ of their environment. More recently, conservative contributors have re‐emphasised disadvantage and exclusion as largely due to behavioural problems of the ‘undeserving poor’, manifest in what is believed to be an ‘underclass’. Critics of the current welfare reform agenda have voiced their concerns about the individualist assumptions that underpin it but their response to date is insufficient because they have generally neglected human agency and have failed to acknowledge individuals as capable actors. While there has been a revival of interest in human agency, greater recognition of agency in debates about welfare is required to mount a credible critique of the conservative assumptions about human behaviour in order to develop a more sensitive theory of the activities of the poor. One of the ways in which this may be achieved is by reconceptualising the concept of social exclusion and highlighting a ‘strong’ rather than a ‘weak’ version.     

An EM and a Stochastic Version of the EM Algorithm for Nonparametric Hidden Semi-Markov Models

The Hidden semi-Markov models (HSMMs) were introduced to overcome the constraint of a geometric sojourn time distribution for the different hidden states in the classical hidden Markov models. Several variations of HSMMs were proposed that model the sojourn times by a parametric or a nonparametric family of distributions. In this article, we concentrate our interest on the nonparametric case where the duration distributions are attached to transitions and not to states as in most of the published papers in HSMMs. Therefore, it is worth noticing that here we treat the underlying hidden semi-Markov chain in its general probabilistic structure. In that case, Barbu and Limnios (2008 Barbu , V. , Limnios , N. ( 2008 ). Semi-Markov Chains and Hidden Semi-Markov Models Toward Applications: Their Use in Reliability and DNA Analysis . New York : Springer . [Google Scholar]) proposed an Expectation–Maximization (EM) algorithm in order to estimate the semi-Markov kernel and the emission probabilities that characterize the dynamics of the model. In this article, we consider an improved version of Barbu and Limnios' EM algorithm which is faster than the original one. Moreover, we propose a stochastic version of the EM algorithm that achieves comparable estimates with the EM algorithm in less execution time. Some numerical examples are provided which illustrate the efficient performance of the proposed algorithms.     

Putting women back in their place. Reflections on slut-shaming,the case Asia Argento and Twitter in Italy

ABSTRACT

Compared to racist and ethnicist discourses, literature on sexist discourses – both off and on-line – as hate speech is relatively underinvestigated. This is partly due to the tendency to minimise accusations of sexism and to reframe misogyny as ‘acceptable’ by constructing it as a form of humour. We decided to focus on slut-shaming, one of the most virulent forms of hate speech, which has always existed but was boosted by social media, becoming a stable low-cost ingredient of today’s rape culture. We propose to consider online slut-shaming as a form of ‘technology-facilitated sexual violence’, where digital technologies are used to facilitate both virtual and face-to-face sexually based harms. According to feminist analysis of sexual violence, this would be a matter of power rather than sex: sex would be the weapon, not the motive. We have tested this research hypothesis by focusing on the Italian reception of the MeToo campaign, triggered by Asia Argento’s denunciation. More specifically, two Different Twitter corpora produced within the same five months period were examined by means of a quantitative and a qualitative methodology.     

COLLECTIVE VERSUS INDIVIDUAL SALE OF TELEVISION RIGHTS IN LEAGUE SPORTS

In many countries, the collective sale of television rights by sports leagues has been challenged by the antitrust authorities. In several cases, however, the leagues won in court, on the ground that sport is not a standard good. In this paper, we investigate the conditions under which the sale of television rights collectively by sports leagues, rather than individually by teams, is preferred from a social welfare point of view. We find that collective sale is socially preferable when (a) leagues are small and relatively homogeneous in terms of clout and (b) teams get little performance‐related revenues. (JEL: L10, L83)     

Companion piece: Convention on the Rights of the Child special protection measures: overview of implications and value for children in the United States

The United Nations Convention on the Rights of the Child (CRC) is an international treaty that commits ratifying states parties to uphold the rights of all children under the age of 18. This article discusses the issues of highest relevance to the United States and reviews the pros and cons of ratifying, from the perspective of the convention's intent and potential, sovereignty of states, and national public policies, and regarding the special protection recommended for particularly vulnerable children. Specific implementation issues discussed include training, accountability, and monitoring.